Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_jail.c
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1 /*- 2 * Copyright (c) 1999 Poul-Henning Kamp. 3 * Copyright (c) 2008 Bjoern A. Zeeb. 4 * Copyright (c) 2009 James Gritton. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD: releng/8.0/sys/kern/kern_jail.c 196989 2009-09-08 19:18:02Z jamie $"); 31 32 #include "opt_compat.h" 33 #include "opt_ddb.h" 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/kernel.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/sysproto.h> 43 #include <sys/malloc.h> 44 #include <sys/osd.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/taskqueue.h> 48 #include <sys/fcntl.h> 49 #include <sys/jail.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/sx.h> 53 #include <sys/sysent.h> 54 #include <sys/namei.h> 55 #include <sys/mount.h> 56 #include <sys/queue.h> 57 #include <sys/socket.h> 58 #include <sys/syscallsubr.h> 59 #include <sys/sysctl.h> 60 #include <sys/vnode.h> 61 62 #include <net/if.h> 63 #include <net/vnet.h> 64 65 #include <netinet/in.h> 66 67 #ifdef DDB 68 #include <ddb/ddb.h> 69 #ifdef INET6 70 #include <netinet6/in6_var.h> 71 #endif /* INET6 */ 72 #endif /* DDB */ 73 74 #include <security/mac/mac_framework.h> 75 76 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 77 78 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 79 80 /* prison0 describes what is "real" about the system. */ 81 struct prison prison0 = { 82 .pr_id = 0, 83 .pr_name = "", 84 .pr_ref = 1, 85 .pr_uref = 1, 86 .pr_path = "/", 87 .pr_securelevel = -1, 88 .pr_childmax = JAIL_MAX, 89 .pr_hostuuid = DEFAULT_HOSTUUID, 90 .pr_children = LIST_HEAD_INITIALIZER(&prison0.pr_children), 91 #ifdef VIMAGE 92 .pr_flags = PR_HOST|PR_VNET, 93 #else 94 .pr_flags = PR_HOST, 95 #endif 96 .pr_allow = PR_ALLOW_ALL, 97 }; 98 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 99 100 /* allprison and lastprid are protected by allprison_lock. */ 101 struct sx allprison_lock; 102 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 103 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 104 int lastprid = 0; 105 106 static int do_jail_attach(struct thread *td, struct prison *pr); 107 static void prison_complete(void *context, int pending); 108 static void prison_deref(struct prison *pr, int flags); 109 static char *prison_path(struct prison *pr1, struct prison *pr2); 110 static void prison_remove_one(struct prison *pr); 111 #ifdef INET 112 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia); 113 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4); 114 #endif 115 #ifdef INET6 116 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6); 117 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6); 118 #endif 119 120 /* Flags for prison_deref */ 121 #define PD_DEREF 0x01 122 #define PD_DEUREF 0x02 123 #define PD_LOCKED 0x04 124 #define PD_LIST_SLOCKED 0x08 125 #define PD_LIST_XLOCKED 0x10 126 127 /* 128 * Parameter names corresponding to PR_* flag values 129 */ 130 static char *pr_flag_names[] = { 131 [0] = "persist", 132 }; 133 134 static char *pr_flag_nonames[] = { 135 [0] = "nopersist", 136 }; 137 138 struct jailsys_flags { 139 const char *name; 140 unsigned disable; 141 unsigned new; 142 } pr_flag_jailsys[] = { 143 { "host", 0, PR_HOST }, 144 #ifdef VIMAGE 145 { "vnet", 0, PR_VNET }, 146 #endif 147 #ifdef INET 148 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER }, 149 #endif 150 #ifdef INET6 151 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER }, 152 #endif 153 }; 154 155 static char *pr_allow_names[] = { 156 "allow.set_hostname", 157 "allow.sysvipc", 158 "allow.raw_sockets", 159 "allow.chflags", 160 "allow.mount", 161 "allow.quotas", 162 "allow.socket_af", 163 }; 164 165 static char *pr_allow_nonames[] = { 166 "allow.noset_hostname", 167 "allow.nosysvipc", 168 "allow.noraw_sockets", 169 "allow.nochflags", 170 "allow.nomount", 171 "allow.noquotas", 172 "allow.nosocket_af", 173 }; 174 175 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 176 #define JAIL_DEFAULT_ENFORCE_STATFS 2 177 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 178 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 179 #if defined(INET) || defined(INET6) 180 static unsigned jail_max_af_ips = 255; 181 #endif 182 183 #ifdef INET 184 static int 185 qcmp_v4(const void *ip1, const void *ip2) 186 { 187 in_addr_t iaa, iab; 188 189 /* 190 * We need to compare in HBO here to get the list sorted as expected 191 * by the result of the code. Sorting NBO addresses gives you 192 * interesting results. If you do not understand, do not try. 193 */ 194 iaa = ntohl(((const struct in_addr *)ip1)->s_addr); 195 iab = ntohl(((const struct in_addr *)ip2)->s_addr); 196 197 /* 198 * Do not simply return the difference of the two numbers, the int is 199 * not wide enough. 200 */ 201 if (iaa > iab) 202 return (1); 203 else if (iaa < iab) 204 return (-1); 205 else 206 return (0); 207 } 208 #endif 209 210 #ifdef INET6 211 static int 212 qcmp_v6(const void *ip1, const void *ip2) 213 { 214 const struct in6_addr *ia6a, *ia6b; 215 int i, rc; 216 217 ia6a = (const struct in6_addr *)ip1; 218 ia6b = (const struct in6_addr *)ip2; 219 220 rc = 0; 221 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 222 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 223 rc = 1; 224 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 225 rc = -1; 226 } 227 return (rc); 228 } 229 #endif 230 231 /* 232 * struct jail_args { 233 * struct jail *jail; 234 * }; 235 */ 236 int 237 jail(struct thread *td, struct jail_args *uap) 238 { 239 uint32_t version; 240 int error; 241 struct jail j; 242 243 error = copyin(uap->jail, &version, sizeof(uint32_t)); 244 if (error) 245 return (error); 246 247 switch (version) { 248 case 0: 249 { 250 struct jail_v0 j0; 251 252 /* FreeBSD single IPv4 jails. */ 253 bzero(&j, sizeof(struct jail)); 254 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 255 if (error) 256 return (error); 257 j.version = j0.version; 258 j.path = j0.path; 259 j.hostname = j0.hostname; 260 j.ip4s = j0.ip_number; 261 break; 262 } 263 264 case 1: 265 /* 266 * Version 1 was used by multi-IPv4 jail implementations 267 * that never made it into the official kernel. 268 */ 269 return (EINVAL); 270 271 case 2: /* JAIL_API_VERSION */ 272 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 273 error = copyin(uap->jail, &j, sizeof(struct jail)); 274 if (error) 275 return (error); 276 break; 277 278 default: 279 /* Sci-Fi jails are not supported, sorry. */ 280 return (EINVAL); 281 } 282 return (kern_jail(td, &j)); 283 } 284 285 int 286 kern_jail(struct thread *td, struct jail *j) 287 { 288 struct iovec optiov[2 * (4 289 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0]) 290 #ifdef INET 291 + 1 292 #endif 293 #ifdef INET6 294 + 1 295 #endif 296 )]; 297 struct uio opt; 298 char *u_path, *u_hostname, *u_name; 299 #ifdef INET 300 uint32_t ip4s; 301 struct in_addr *u_ip4; 302 #endif 303 #ifdef INET6 304 struct in6_addr *u_ip6; 305 #endif 306 size_t tmplen; 307 int error, enforce_statfs, fi; 308 309 bzero(&optiov, sizeof(optiov)); 310 opt.uio_iov = optiov; 311 opt.uio_iovcnt = 0; 312 opt.uio_offset = -1; 313 opt.uio_resid = -1; 314 opt.uio_segflg = UIO_SYSSPACE; 315 opt.uio_rw = UIO_READ; 316 opt.uio_td = td; 317 318 /* Set permissions for top-level jails from sysctls. */ 319 if (!jailed(td->td_ucred)) { 320 for (fi = 0; fi < sizeof(pr_allow_names) / 321 sizeof(pr_allow_names[0]); fi++) { 322 optiov[opt.uio_iovcnt].iov_base = 323 (jail_default_allow & (1 << fi)) 324 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 325 optiov[opt.uio_iovcnt].iov_len = 326 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 327 opt.uio_iovcnt += 2; 328 } 329 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 330 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 331 opt.uio_iovcnt++; 332 enforce_statfs = jail_default_enforce_statfs; 333 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 334 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 335 opt.uio_iovcnt++; 336 } 337 338 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 339 #ifdef INET 340 ip4s = (j->version == 0) ? 1 : j->ip4s; 341 if (ip4s > jail_max_af_ips) 342 return (EINVAL); 343 tmplen += ip4s * sizeof(struct in_addr); 344 #else 345 if (j->ip4s > 0) 346 return (EINVAL); 347 #endif 348 #ifdef INET6 349 if (j->ip6s > jail_max_af_ips) 350 return (EINVAL); 351 tmplen += j->ip6s * sizeof(struct in6_addr); 352 #else 353 if (j->ip6s > 0) 354 return (EINVAL); 355 #endif 356 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 357 u_hostname = u_path + MAXPATHLEN; 358 u_name = u_hostname + MAXHOSTNAMELEN; 359 #ifdef INET 360 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 361 #endif 362 #ifdef INET6 363 #ifdef INET 364 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 365 #else 366 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 367 #endif 368 #endif 369 optiov[opt.uio_iovcnt].iov_base = "path"; 370 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 371 opt.uio_iovcnt++; 372 optiov[opt.uio_iovcnt].iov_base = u_path; 373 error = copyinstr(j->path, u_path, MAXPATHLEN, 374 &optiov[opt.uio_iovcnt].iov_len); 375 if (error) { 376 free(u_path, M_TEMP); 377 return (error); 378 } 379 opt.uio_iovcnt++; 380 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 381 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 382 opt.uio_iovcnt++; 383 optiov[opt.uio_iovcnt].iov_base = u_hostname; 384 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 385 &optiov[opt.uio_iovcnt].iov_len); 386 if (error) { 387 free(u_path, M_TEMP); 388 return (error); 389 } 390 opt.uio_iovcnt++; 391 if (j->jailname != NULL) { 392 optiov[opt.uio_iovcnt].iov_base = "name"; 393 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 394 opt.uio_iovcnt++; 395 optiov[opt.uio_iovcnt].iov_base = u_name; 396 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 397 &optiov[opt.uio_iovcnt].iov_len); 398 if (error) { 399 free(u_path, M_TEMP); 400 return (error); 401 } 402 opt.uio_iovcnt++; 403 } 404 #ifdef INET 405 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 406 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 407 opt.uio_iovcnt++; 408 optiov[opt.uio_iovcnt].iov_base = u_ip4; 409 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 410 if (j->version == 0) 411 u_ip4->s_addr = j->ip4s; 412 else { 413 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 414 if (error) { 415 free(u_path, M_TEMP); 416 return (error); 417 } 418 } 419 opt.uio_iovcnt++; 420 #endif 421 #ifdef INET6 422 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 423 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 424 opt.uio_iovcnt++; 425 optiov[opt.uio_iovcnt].iov_base = u_ip6; 426 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 427 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 428 if (error) { 429 free(u_path, M_TEMP); 430 return (error); 431 } 432 opt.uio_iovcnt++; 433 #endif 434 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]), 435 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 436 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 437 free(u_path, M_TEMP); 438 return (error); 439 } 440 441 442 /* 443 * struct jail_set_args { 444 * struct iovec *iovp; 445 * unsigned int iovcnt; 446 * int flags; 447 * }; 448 */ 449 int 450 jail_set(struct thread *td, struct jail_set_args *uap) 451 { 452 struct uio *auio; 453 int error; 454 455 /* Check that we have an even number of iovecs. */ 456 if (uap->iovcnt & 1) 457 return (EINVAL); 458 459 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 460 if (error) 461 return (error); 462 error = kern_jail_set(td, auio, uap->flags); 463 free(auio, M_IOV); 464 return (error); 465 } 466 467 int 468 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 469 { 470 struct nameidata nd; 471 #ifdef INET 472 struct in_addr *ip4; 473 #endif 474 #ifdef INET6 475 struct in6_addr *ip6; 476 #endif 477 struct vfsopt *opt; 478 struct vfsoptlist *opts; 479 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 480 struct vnode *root; 481 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 482 #if defined(INET) || defined(INET6) 483 struct prison *tppr; 484 void *op; 485 #endif 486 unsigned long hid; 487 size_t namelen, onamelen; 488 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos; 489 int gotchildmax, gotenforce, gothid, gotslevel; 490 int fi, jid, jsys, len, level; 491 int childmax, slevel, vfslocked; 492 #if defined(INET) || defined(INET6) 493 int ii, ij; 494 #endif 495 #ifdef INET 496 int ip4s, redo_ip4; 497 #endif 498 #ifdef INET6 499 int ip6s, redo_ip6; 500 #endif 501 unsigned pr_flags, ch_flags; 502 unsigned pr_allow, ch_allow, tallow; 503 char numbuf[12]; 504 505 error = priv_check(td, PRIV_JAIL_SET); 506 if (!error && (flags & JAIL_ATTACH)) 507 error = priv_check(td, PRIV_JAIL_ATTACH); 508 if (error) 509 return (error); 510 mypr = ppr = td->td_ucred->cr_prison; 511 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 512 return (EPERM); 513 if (flags & ~JAIL_SET_MASK) 514 return (EINVAL); 515 516 /* 517 * Check all the parameters before committing to anything. Not all 518 * errors can be caught early, but we may as well try. Also, this 519 * takes care of some expensive stuff (path lookup) before getting 520 * the allprison lock. 521 * 522 * XXX Jails are not filesystems, and jail parameters are not mount 523 * options. But it makes more sense to re-use the vfsopt code 524 * than duplicate it under a different name. 525 */ 526 error = vfs_buildopts(optuio, &opts); 527 if (error) 528 return (error); 529 #ifdef INET 530 ip4 = NULL; 531 #endif 532 #ifdef INET6 533 ip6 = NULL; 534 #endif 535 536 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 537 if (error == ENOENT) 538 jid = 0; 539 else if (error != 0) 540 goto done_free; 541 542 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 543 if (error == ENOENT) 544 gotslevel = 0; 545 else if (error != 0) 546 goto done_free; 547 else 548 gotslevel = 1; 549 550 error = 551 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 552 if (error == ENOENT) 553 gotchildmax = 0; 554 else if (error != 0) 555 goto done_free; 556 else 557 gotchildmax = 1; 558 559 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 560 gotenforce = (error == 0); 561 if (gotenforce) { 562 if (enforce < 0 || enforce > 2) 563 return (EINVAL); 564 } else if (error != ENOENT) 565 goto done_free; 566 567 pr_flags = ch_flags = 0; 568 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 569 fi++) { 570 if (pr_flag_names[fi] == NULL) 571 continue; 572 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 573 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 574 } 575 ch_flags |= pr_flags; 576 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 577 fi++) { 578 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 579 sizeof(jsys)); 580 if (error == ENOENT) 581 continue; 582 if (error != 0) 583 goto done_free; 584 switch (jsys) { 585 case JAIL_SYS_DISABLE: 586 if (!pr_flag_jailsys[fi].disable) { 587 error = EINVAL; 588 goto done_free; 589 } 590 pr_flags |= pr_flag_jailsys[fi].disable; 591 break; 592 case JAIL_SYS_NEW: 593 pr_flags |= pr_flag_jailsys[fi].new; 594 break; 595 case JAIL_SYS_INHERIT: 596 break; 597 default: 598 error = EINVAL; 599 goto done_free; 600 } 601 ch_flags |= 602 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 603 } 604 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 605 && !(pr_flags & PR_PERSIST)) { 606 error = EINVAL; 607 vfs_opterror(opts, "new jail must persist or attach"); 608 goto done_errmsg; 609 } 610 #ifdef VIMAGE 611 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 612 error = EINVAL; 613 vfs_opterror(opts, "vnet cannot be changed after creation"); 614 goto done_errmsg; 615 } 616 #endif 617 #ifdef INET 618 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 619 error = EINVAL; 620 vfs_opterror(opts, "ip4 cannot be changed after creation"); 621 goto done_errmsg; 622 } 623 #endif 624 #ifdef INET6 625 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 626 error = EINVAL; 627 vfs_opterror(opts, "ip6 cannot be changed after creation"); 628 goto done_errmsg; 629 } 630 #endif 631 632 pr_allow = ch_allow = 0; 633 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 634 fi++) { 635 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 636 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 637 } 638 ch_allow |= pr_allow; 639 640 error = vfs_getopt(opts, "name", (void **)&name, &len); 641 if (error == ENOENT) 642 name = NULL; 643 else if (error != 0) 644 goto done_free; 645 else { 646 if (len == 0 || name[len - 1] != '\0') { 647 error = EINVAL; 648 goto done_free; 649 } 650 if (len > MAXHOSTNAMELEN) { 651 error = ENAMETOOLONG; 652 goto done_free; 653 } 654 } 655 656 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 657 if (error == ENOENT) 658 host = NULL; 659 else if (error != 0) 660 goto done_free; 661 else { 662 ch_flags |= PR_HOST; 663 pr_flags |= PR_HOST; 664 if (len == 0 || host[len - 1] != '\0') { 665 error = EINVAL; 666 goto done_free; 667 } 668 if (len > MAXHOSTNAMELEN) { 669 error = ENAMETOOLONG; 670 goto done_free; 671 } 672 } 673 674 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 675 if (error == ENOENT) 676 domain = NULL; 677 else if (error != 0) 678 goto done_free; 679 else { 680 ch_flags |= PR_HOST; 681 pr_flags |= PR_HOST; 682 if (len == 0 || domain[len - 1] != '\0') { 683 error = EINVAL; 684 goto done_free; 685 } 686 if (len > MAXHOSTNAMELEN) { 687 error = ENAMETOOLONG; 688 goto done_free; 689 } 690 } 691 692 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 693 if (error == ENOENT) 694 uuid = NULL; 695 else if (error != 0) 696 goto done_free; 697 else { 698 ch_flags |= PR_HOST; 699 pr_flags |= PR_HOST; 700 if (len == 0 || uuid[len - 1] != '\0') { 701 error = EINVAL; 702 goto done_free; 703 } 704 if (len > HOSTUUIDLEN) { 705 error = ENAMETOOLONG; 706 goto done_free; 707 } 708 } 709 710 #ifdef COMPAT_IA32 711 if (td->td_proc->p_sysent->sv_flags & SV_IA32) { 712 uint32_t hid32; 713 714 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 715 hid = hid32; 716 } else 717 #endif 718 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 719 if (error == ENOENT) 720 gothid = 0; 721 else if (error != 0) 722 goto done_free; 723 else { 724 gothid = 1; 725 ch_flags |= PR_HOST; 726 pr_flags |= PR_HOST; 727 } 728 729 #ifdef INET 730 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 731 if (error == ENOENT) 732 ip4s = (pr_flags & PR_IP4_DISABLE) ? 0 : -1; 733 else if (error != 0) 734 goto done_free; 735 else if (ip4s & (sizeof(*ip4) - 1)) { 736 error = EINVAL; 737 goto done_free; 738 } else { 739 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE; 740 if (ip4s == 0) 741 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE; 742 else { 743 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER; 744 ip4s /= sizeof(*ip4); 745 if (ip4s > jail_max_af_ips) { 746 error = EINVAL; 747 vfs_opterror(opts, "too many IPv4 addresses"); 748 goto done_errmsg; 749 } 750 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 751 bcopy(op, ip4, ip4s * sizeof(*ip4)); 752 /* 753 * IP addresses are all sorted but ip[0] to preserve 754 * the primary IP address as given from userland. 755 * This special IP is used for unbound outgoing 756 * connections as well for "loopback" traffic. 757 */ 758 if (ip4s > 1) 759 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4); 760 /* 761 * Check for duplicate addresses and do some simple 762 * zero and broadcast checks. If users give other bogus 763 * addresses it is their problem. 764 * 765 * We do not have to care about byte order for these 766 * checks so we will do them in NBO. 767 */ 768 for (ii = 0; ii < ip4s; ii++) { 769 if (ip4[ii].s_addr == INADDR_ANY || 770 ip4[ii].s_addr == INADDR_BROADCAST) { 771 error = EINVAL; 772 goto done_free; 773 } 774 if ((ii+1) < ip4s && 775 (ip4[0].s_addr == ip4[ii+1].s_addr || 776 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 777 error = EINVAL; 778 goto done_free; 779 } 780 } 781 } 782 } 783 #endif 784 785 #ifdef INET6 786 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 787 if (error == ENOENT) 788 ip6s = (pr_flags & PR_IP6_DISABLE) ? 0 : -1; 789 else if (error != 0) 790 goto done_free; 791 else if (ip6s & (sizeof(*ip6) - 1)) { 792 error = EINVAL; 793 goto done_free; 794 } else { 795 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE; 796 if (ip6s == 0) 797 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE; 798 else { 799 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER; 800 ip6s /= sizeof(*ip6); 801 if (ip6s > jail_max_af_ips) { 802 error = EINVAL; 803 vfs_opterror(opts, "too many IPv6 addresses"); 804 goto done_errmsg; 805 } 806 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 807 bcopy(op, ip6, ip6s * sizeof(*ip6)); 808 if (ip6s > 1) 809 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6); 810 for (ii = 0; ii < ip6s; ii++) { 811 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 812 error = EINVAL; 813 goto done_free; 814 } 815 if ((ii+1) < ip6s && 816 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 817 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 818 { 819 error = EINVAL; 820 goto done_free; 821 } 822 } 823 } 824 } 825 #endif 826 827 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 828 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 829 error = EINVAL; 830 vfs_opterror(opts, 831 "vnet jails cannot have IP address restrictions"); 832 goto done_errmsg; 833 } 834 #endif 835 836 root = NULL; 837 error = vfs_getopt(opts, "path", (void **)&path, &len); 838 if (error == ENOENT) 839 path = NULL; 840 else if (error != 0) 841 goto done_free; 842 else { 843 if (flags & JAIL_UPDATE) { 844 error = EINVAL; 845 vfs_opterror(opts, 846 "path cannot be changed after creation"); 847 goto done_errmsg; 848 } 849 if (len == 0 || path[len - 1] != '\0') { 850 error = EINVAL; 851 goto done_free; 852 } 853 if (len < 2 || (len == 2 && path[0] == '/')) 854 path = NULL; 855 else { 856 /* Leave room for a real-root full pathname. */ 857 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 858 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 859 error = ENAMETOOLONG; 860 goto done_free; 861 } 862 NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW, UIO_SYSSPACE, 863 path, td); 864 error = namei(&nd); 865 if (error) 866 goto done_free; 867 vfslocked = NDHASGIANT(&nd); 868 root = nd.ni_vp; 869 NDFREE(&nd, NDF_ONLY_PNBUF); 870 if (root->v_type != VDIR) { 871 error = ENOTDIR; 872 vrele(root); 873 VFS_UNLOCK_GIANT(vfslocked); 874 goto done_free; 875 } 876 VFS_UNLOCK_GIANT(vfslocked); 877 } 878 } 879 880 /* 881 * Grab the allprison lock before letting modules check their 882 * parameters. Once we have it, do not let go so we'll have a 883 * consistent view of the OSD list. 884 */ 885 sx_xlock(&allprison_lock); 886 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts); 887 if (error) 888 goto done_unlock_list; 889 890 /* By now, all parameters should have been noted. */ 891 TAILQ_FOREACH(opt, opts, link) { 892 if (!opt->seen && strcmp(opt->name, "errmsg")) { 893 error = EINVAL; 894 vfs_opterror(opts, "unknown parameter: %s", opt->name); 895 goto done_unlock_list; 896 } 897 } 898 899 /* 900 * See if we are creating a new record or updating an existing one. 901 * This abuses the file error codes ENOENT and EEXIST. 902 */ 903 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 904 if (!cuflags) { 905 error = EINVAL; 906 vfs_opterror(opts, "no valid operation (create or update)"); 907 goto done_unlock_list; 908 } 909 pr = NULL; 910 namelc = NULL; 911 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 912 namelc = strrchr(name, '.'); 913 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 914 if (*p != '\0') 915 jid = 0; 916 } 917 if (jid != 0) { 918 /* 919 * See if a requested jid already exists. There is an 920 * information leak here if the jid exists but is not within 921 * the caller's jail hierarchy. Jail creators will get EEXIST 922 * even though they cannot see the jail, and CREATE | UPDATE 923 * will return ENOENT which is not normally a valid error. 924 */ 925 if (jid < 0) { 926 error = EINVAL; 927 vfs_opterror(opts, "negative jid"); 928 goto done_unlock_list; 929 } 930 pr = prison_find(jid); 931 if (pr != NULL) { 932 ppr = pr->pr_parent; 933 /* Create: jid must not exist. */ 934 if (cuflags == JAIL_CREATE) { 935 mtx_unlock(&pr->pr_mtx); 936 error = EEXIST; 937 vfs_opterror(opts, "jail %d already exists", 938 jid); 939 goto done_unlock_list; 940 } 941 if (!prison_ischild(mypr, pr)) { 942 mtx_unlock(&pr->pr_mtx); 943 pr = NULL; 944 } else if (pr->pr_uref == 0) { 945 if (!(flags & JAIL_DYING)) { 946 mtx_unlock(&pr->pr_mtx); 947 error = ENOENT; 948 vfs_opterror(opts, "jail %d is dying", 949 jid); 950 goto done_unlock_list; 951 } else if ((flags & JAIL_ATTACH) || 952 (pr_flags & PR_PERSIST)) { 953 /* 954 * A dying jail might be resurrected 955 * (via attach or persist), but first 956 * it must determine if another jail 957 * has claimed its name. Accomplish 958 * this by implicitly re-setting the 959 * name. 960 */ 961 if (name == NULL) 962 name = prison_name(mypr, pr); 963 } 964 } 965 } 966 if (pr == NULL) { 967 /* Update: jid must exist. */ 968 if (cuflags == JAIL_UPDATE) { 969 error = ENOENT; 970 vfs_opterror(opts, "jail %d not found", jid); 971 goto done_unlock_list; 972 } 973 } 974 } 975 /* 976 * If the caller provided a name, look for a jail by that name. 977 * This has different semantics for creates and updates keyed by jid 978 * (where the name must not already exist in a different jail), 979 * and updates keyed by the name itself (where the name must exist 980 * because that is the jail being updated). 981 */ 982 if (name != NULL) { 983 namelc = strrchr(name, '.'); 984 if (namelc == NULL) 985 namelc = name; 986 else { 987 /* 988 * This is a hierarchical name. Split it into the 989 * parent and child names, and make sure the parent 990 * exists or matches an already found jail. 991 */ 992 *namelc = '\0'; 993 if (pr != NULL) { 994 if (strncmp(name, ppr->pr_name, namelc - name) 995 || ppr->pr_name[namelc - name] != '\0') { 996 mtx_unlock(&pr->pr_mtx); 997 error = EINVAL; 998 vfs_opterror(opts, 999 "cannot change jail's parent"); 1000 goto done_unlock_list; 1001 } 1002 } else { 1003 ppr = prison_find_name(mypr, name); 1004 if (ppr == NULL) { 1005 error = ENOENT; 1006 vfs_opterror(opts, 1007 "jail \"%s\" not found", name); 1008 goto done_unlock_list; 1009 } 1010 mtx_unlock(&ppr->pr_mtx); 1011 } 1012 name = ++namelc; 1013 } 1014 if (name[0] != '\0') { 1015 namelen = 1016 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1017 name_again: 1018 deadpr = NULL; 1019 FOREACH_PRISON_CHILD(ppr, tpr) { 1020 if (tpr != pr && tpr->pr_ref > 0 && 1021 !strcmp(tpr->pr_name + namelen, name)) { 1022 if (pr == NULL && 1023 cuflags != JAIL_CREATE) { 1024 mtx_lock(&tpr->pr_mtx); 1025 if (tpr->pr_ref > 0) { 1026 /* 1027 * Use this jail 1028 * for updates. 1029 */ 1030 if (tpr->pr_uref > 0) { 1031 pr = tpr; 1032 break; 1033 } 1034 deadpr = tpr; 1035 } 1036 mtx_unlock(&tpr->pr_mtx); 1037 } else if (tpr->pr_uref > 0) { 1038 /* 1039 * Create, or update(jid): 1040 * name must not exist in an 1041 * active sibling jail. 1042 */ 1043 error = EEXIST; 1044 if (pr != NULL) 1045 mtx_unlock(&pr->pr_mtx); 1046 vfs_opterror(opts, 1047 "jail \"%s\" already exists", 1048 name); 1049 goto done_unlock_list; 1050 } 1051 } 1052 } 1053 /* If no active jail is found, use a dying one. */ 1054 if (deadpr != NULL && pr == NULL) { 1055 if (flags & JAIL_DYING) { 1056 mtx_lock(&deadpr->pr_mtx); 1057 if (deadpr->pr_ref == 0) { 1058 mtx_unlock(&deadpr->pr_mtx); 1059 goto name_again; 1060 } 1061 pr = deadpr; 1062 } else if (cuflags == JAIL_UPDATE) { 1063 error = ENOENT; 1064 vfs_opterror(opts, 1065 "jail \"%s\" is dying", name); 1066 goto done_unlock_list; 1067 } 1068 } 1069 /* Update: name must exist if no jid. */ 1070 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1071 error = ENOENT; 1072 vfs_opterror(opts, "jail \"%s\" not found", 1073 name); 1074 goto done_unlock_list; 1075 } 1076 } 1077 } 1078 /* Update: must provide a jid or name. */ 1079 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1080 error = ENOENT; 1081 vfs_opterror(opts, "update specified no jail"); 1082 goto done_unlock_list; 1083 } 1084 1085 /* If there's no prison to update, create a new one and link it in. */ 1086 if (pr == NULL) { 1087 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1088 if (tpr->pr_childcount >= tpr->pr_childmax) { 1089 error = EPERM; 1090 vfs_opterror(opts, "prison limit exceeded"); 1091 goto done_unlock_list; 1092 } 1093 created = 1; 1094 mtx_lock(&ppr->pr_mtx); 1095 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) { 1096 mtx_unlock(&ppr->pr_mtx); 1097 error = ENOENT; 1098 vfs_opterror(opts, "parent jail went away!"); 1099 goto done_unlock_list; 1100 } 1101 ppr->pr_ref++; 1102 ppr->pr_uref++; 1103 mtx_unlock(&ppr->pr_mtx); 1104 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1105 if (jid == 0) { 1106 /* Find the next free jid. */ 1107 jid = lastprid + 1; 1108 findnext: 1109 if (jid == JAIL_MAX) 1110 jid = 1; 1111 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1112 if (tpr->pr_id < jid) 1113 continue; 1114 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1115 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1116 break; 1117 } 1118 if (jid == lastprid) { 1119 error = EAGAIN; 1120 vfs_opterror(opts, 1121 "no available jail IDs"); 1122 free(pr, M_PRISON); 1123 prison_deref(ppr, PD_DEREF | 1124 PD_DEUREF | PD_LIST_XLOCKED); 1125 goto done_releroot; 1126 } 1127 jid++; 1128 goto findnext; 1129 } 1130 lastprid = jid; 1131 } else { 1132 /* 1133 * The jail already has a jid (that did not yet exist), 1134 * so just find where to insert it. 1135 */ 1136 TAILQ_FOREACH(tpr, &allprison, pr_list) 1137 if (tpr->pr_id >= jid) { 1138 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1139 break; 1140 } 1141 } 1142 if (tpr == NULL) 1143 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1144 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1145 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1146 tpr->pr_childcount++; 1147 1148 pr->pr_parent = ppr; 1149 pr->pr_id = jid; 1150 1151 /* Set some default values, and inherit some from the parent. */ 1152 if (name == NULL) 1153 name = ""; 1154 if (path == NULL) { 1155 path = "/"; 1156 root = mypr->pr_root; 1157 vref(root); 1158 } 1159 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1160 pr->pr_flags |= PR_HOST; 1161 #if defined(INET) || defined(INET6) 1162 #ifdef VIMAGE 1163 if (!(pr_flags & PR_VNET)) 1164 #endif 1165 { 1166 #ifdef INET 1167 if (!(ch_flags & PR_IP4_USER)) 1168 pr->pr_flags |= 1169 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE; 1170 else if (!(pr_flags & PR_IP4_USER)) { 1171 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1172 if (ppr->pr_ip4 != NULL) { 1173 pr->pr_ip4s = ppr->pr_ip4s; 1174 pr->pr_ip4 = malloc(pr->pr_ip4s * 1175 sizeof(struct in_addr), M_PRISON, 1176 M_WAITOK); 1177 bcopy(ppr->pr_ip4, pr->pr_ip4, 1178 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1179 } 1180 } 1181 #endif 1182 #ifdef INET6 1183 if (!(ch_flags & PR_IP6_USER)) 1184 pr->pr_flags |= 1185 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE; 1186 else if (!(pr_flags & PR_IP6_USER)) { 1187 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1188 if (ppr->pr_ip6 != NULL) { 1189 pr->pr_ip6s = ppr->pr_ip6s; 1190 pr->pr_ip6 = malloc(pr->pr_ip6s * 1191 sizeof(struct in6_addr), M_PRISON, 1192 M_WAITOK); 1193 bcopy(ppr->pr_ip6, pr->pr_ip6, 1194 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1195 } 1196 } 1197 #endif 1198 } 1199 #endif 1200 pr->pr_securelevel = ppr->pr_securelevel; 1201 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1202 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 1203 1204 LIST_INIT(&pr->pr_children); 1205 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1206 1207 #ifdef VIMAGE 1208 /* Allocate a new vnet if specified. */ 1209 pr->pr_vnet = (pr_flags & PR_VNET) 1210 ? vnet_alloc() : ppr->pr_vnet; 1211 #endif 1212 /* 1213 * Allocate a dedicated cpuset for each jail. 1214 * Unlike other initial settings, this may return an erorr. 1215 */ 1216 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1217 if (error) { 1218 prison_deref(pr, PD_LIST_XLOCKED); 1219 goto done_releroot; 1220 } 1221 1222 mtx_lock(&pr->pr_mtx); 1223 /* 1224 * New prisons do not yet have a reference, because we do not 1225 * want other to see the incomplete prison once the 1226 * allprison_lock is downgraded. 1227 */ 1228 } else { 1229 created = 0; 1230 /* 1231 * Grab a reference for existing prisons, to ensure they 1232 * continue to exist for the duration of the call. 1233 */ 1234 pr->pr_ref++; 1235 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1236 if ((pr->pr_flags & PR_VNET) && 1237 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1238 error = EINVAL; 1239 vfs_opterror(opts, 1240 "vnet jails cannot have IP address restrictions"); 1241 goto done_deref_locked; 1242 } 1243 #endif 1244 #ifdef INET 1245 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1246 error = EINVAL; 1247 vfs_opterror(opts, 1248 "ip4 cannot be changed after creation"); 1249 goto done_deref_locked; 1250 } 1251 #endif 1252 #ifdef INET6 1253 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1254 error = EINVAL; 1255 vfs_opterror(opts, 1256 "ip6 cannot be changed after creation"); 1257 goto done_deref_locked; 1258 } 1259 #endif 1260 } 1261 1262 /* Do final error checking before setting anything. */ 1263 if (gotslevel) { 1264 if (slevel < ppr->pr_securelevel) { 1265 error = EPERM; 1266 goto done_deref_locked; 1267 } 1268 } 1269 if (gotchildmax) { 1270 if (childmax >= ppr->pr_childmax) { 1271 error = EPERM; 1272 goto done_deref_locked; 1273 } 1274 } 1275 if (gotenforce) { 1276 if (enforce < ppr->pr_enforce_statfs) { 1277 error = EPERM; 1278 goto done_deref_locked; 1279 } 1280 } 1281 #ifdef INET 1282 if (ip4s > 0) { 1283 if (ppr->pr_flags & PR_IP4) { 1284 /* 1285 * Make sure the new set of IP addresses is a 1286 * subset of the parent's list. Don't worry 1287 * about the parent being unlocked, as any 1288 * setting is done with allprison_lock held. 1289 */ 1290 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1291 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1292 break; 1293 if (ij == ppr->pr_ip4s) { 1294 error = EPERM; 1295 goto done_deref_locked; 1296 } 1297 if (ip4s > 1) { 1298 for (ii = ij = 1; ii < ip4s; ii++) { 1299 if (ip4[ii].s_addr == 1300 ppr->pr_ip4[0].s_addr) 1301 continue; 1302 for (; ij < ppr->pr_ip4s; ij++) 1303 if (ip4[ii].s_addr == 1304 ppr->pr_ip4[ij].s_addr) 1305 break; 1306 if (ij == ppr->pr_ip4s) 1307 break; 1308 } 1309 if (ij == ppr->pr_ip4s) { 1310 error = EPERM; 1311 goto done_deref_locked; 1312 } 1313 } 1314 } 1315 /* 1316 * Check for conflicting IP addresses. We permit them 1317 * if there is no more than one IP on each jail. If 1318 * there is a duplicate on a jail with more than one 1319 * IP stop checking and return error. 1320 */ 1321 tppr = ppr; 1322 #ifdef VIMAGE 1323 for (; tppr != &prison0; tppr = tppr->pr_parent) 1324 if (tppr->pr_flags & PR_VNET) 1325 break; 1326 #endif 1327 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1328 if (tpr == pr || 1329 #ifdef VIMAGE 1330 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1331 #endif 1332 tpr->pr_uref == 0) { 1333 descend = 0; 1334 continue; 1335 } 1336 if (!(tpr->pr_flags & PR_IP4_USER)) 1337 continue; 1338 descend = 0; 1339 if (tpr->pr_ip4 == NULL || 1340 (ip4s == 1 && tpr->pr_ip4s == 1)) 1341 continue; 1342 for (ii = 0; ii < ip4s; ii++) { 1343 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1344 error = EADDRINUSE; 1345 vfs_opterror(opts, 1346 "IPv4 addresses clash"); 1347 goto done_deref_locked; 1348 } 1349 } 1350 } 1351 } 1352 #endif 1353 #ifdef INET6 1354 if (ip6s > 0) { 1355 if (ppr->pr_flags & PR_IP6) { 1356 /* 1357 * Make sure the new set of IP addresses is a 1358 * subset of the parent's list. 1359 */ 1360 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1361 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1362 &ppr->pr_ip6[ij])) 1363 break; 1364 if (ij == ppr->pr_ip6s) { 1365 error = EPERM; 1366 goto done_deref_locked; 1367 } 1368 if (ip6s > 1) { 1369 for (ii = ij = 1; ii < ip6s; ii++) { 1370 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1371 &ppr->pr_ip6[0])) 1372 continue; 1373 for (; ij < ppr->pr_ip6s; ij++) 1374 if (IN6_ARE_ADDR_EQUAL( 1375 &ip6[ii], &ppr->pr_ip6[ij])) 1376 break; 1377 if (ij == ppr->pr_ip6s) 1378 break; 1379 } 1380 if (ij == ppr->pr_ip6s) { 1381 error = EPERM; 1382 goto done_deref_locked; 1383 } 1384 } 1385 } 1386 /* Check for conflicting IP addresses. */ 1387 tppr = ppr; 1388 #ifdef VIMAGE 1389 for (; tppr != &prison0; tppr = tppr->pr_parent) 1390 if (tppr->pr_flags & PR_VNET) 1391 break; 1392 #endif 1393 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1394 if (tpr == pr || 1395 #ifdef VIMAGE 1396 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1397 #endif 1398 tpr->pr_uref == 0) { 1399 descend = 0; 1400 continue; 1401 } 1402 if (!(tpr->pr_flags & PR_IP6_USER)) 1403 continue; 1404 descend = 0; 1405 if (tpr->pr_ip6 == NULL || 1406 (ip6s == 1 && tpr->pr_ip6s == 1)) 1407 continue; 1408 for (ii = 0; ii < ip6s; ii++) { 1409 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1410 error = EADDRINUSE; 1411 vfs_opterror(opts, 1412 "IPv6 addresses clash"); 1413 goto done_deref_locked; 1414 } 1415 } 1416 } 1417 } 1418 #endif 1419 onamelen = namelen = 0; 1420 if (name != NULL) { 1421 /* Give a default name of the jid. */ 1422 if (name[0] == '\0') 1423 snprintf(name = numbuf, sizeof(numbuf), "%d", jid); 1424 else if (*namelc == '' || (strtoul(namelc, &p, 10) != jid && 1425 *p == '\0')) { 1426 error = EINVAL; 1427 vfs_opterror(opts, 1428 "name cannot be numeric (unless it is the jid)"); 1429 goto done_deref_locked; 1430 } 1431 /* 1432 * Make sure the name isn't too long for the prison or its 1433 * children. 1434 */ 1435 onamelen = strlen(pr->pr_name); 1436 namelen = strlen(name); 1437 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) { 1438 error = ENAMETOOLONG; 1439 goto done_deref_locked; 1440 } 1441 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1442 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1443 sizeof(pr->pr_name)) { 1444 error = ENAMETOOLONG; 1445 goto done_deref_locked; 1446 } 1447 } 1448 } 1449 if (pr_allow & ~ppr->pr_allow) { 1450 error = EPERM; 1451 goto done_deref_locked; 1452 } 1453 1454 /* Set the parameters of the prison. */ 1455 #ifdef INET 1456 redo_ip4 = 0; 1457 if (pr_flags & PR_IP4_USER) { 1458 pr->pr_flags |= PR_IP4; 1459 free(pr->pr_ip4, M_PRISON); 1460 pr->pr_ip4s = ip4s; 1461 pr->pr_ip4 = ip4; 1462 ip4 = NULL; 1463 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1464 #ifdef VIMAGE 1465 if (tpr->pr_flags & PR_VNET) { 1466 descend = 0; 1467 continue; 1468 } 1469 #endif 1470 if (prison_restrict_ip4(tpr, NULL)) { 1471 redo_ip4 = 1; 1472 descend = 0; 1473 } 1474 } 1475 } 1476 #endif 1477 #ifdef INET6 1478 redo_ip6 = 0; 1479 if (pr_flags & PR_IP6_USER) { 1480 pr->pr_flags |= PR_IP6; 1481 free(pr->pr_ip6, M_PRISON); 1482 pr->pr_ip6s = ip6s; 1483 pr->pr_ip6 = ip6; 1484 ip6 = NULL; 1485 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1486 #ifdef VIMAGE 1487 if (tpr->pr_flags & PR_VNET) { 1488 descend = 0; 1489 continue; 1490 } 1491 #endif 1492 if (prison_restrict_ip6(tpr, NULL)) { 1493 redo_ip6 = 1; 1494 descend = 0; 1495 } 1496 } 1497 } 1498 #endif 1499 if (gotslevel) { 1500 pr->pr_securelevel = slevel; 1501 /* Set all child jails to be at least this level. */ 1502 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1503 if (tpr->pr_securelevel < slevel) 1504 tpr->pr_securelevel = slevel; 1505 } 1506 if (gotchildmax) { 1507 pr->pr_childmax = childmax; 1508 /* Set all child jails to under this limit. */ 1509 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1510 if (tpr->pr_childmax > childmax - level) 1511 tpr->pr_childmax = childmax > level 1512 ? childmax - level : 0; 1513 } 1514 if (gotenforce) { 1515 pr->pr_enforce_statfs = enforce; 1516 /* Pass this restriction on to the children. */ 1517 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1518 if (tpr->pr_enforce_statfs < enforce) 1519 tpr->pr_enforce_statfs = enforce; 1520 } 1521 if (name != NULL) { 1522 if (ppr == &prison0) 1523 strlcpy(pr->pr_name, name, sizeof(pr->pr_name)); 1524 else 1525 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1526 ppr->pr_name, name); 1527 /* Change this component of child names. */ 1528 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1529 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1530 strlen(tpr->pr_name + onamelen) + 1); 1531 bcopy(pr->pr_name, tpr->pr_name, namelen); 1532 } 1533 } 1534 if (path != NULL) { 1535 /* Try to keep a real-rooted full pathname. */ 1536 if (path[0] == '/' && strcmp(mypr->pr_path, "/")) 1537 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1538 mypr->pr_path, path); 1539 else 1540 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1541 pr->pr_root = root; 1542 } 1543 if (PR_HOST & ch_flags & ~pr_flags) { 1544 if (pr->pr_flags & PR_HOST) { 1545 /* 1546 * Copy the parent's host info. As with pr_ip4 above, 1547 * the lack of a lock on the parent is not a problem; 1548 * it is always set with allprison_lock at least 1549 * shared, and is held exclusively here. 1550 */ 1551 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1552 sizeof(pr->pr_hostname)); 1553 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1554 sizeof(pr->pr_domainname)); 1555 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1556 sizeof(pr->pr_hostuuid)); 1557 pr->pr_hostid = pr->pr_parent->pr_hostid; 1558 } 1559 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1560 /* Set this prison, and any descendants without PR_HOST. */ 1561 if (host != NULL) 1562 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1563 if (domain != NULL) 1564 strlcpy(pr->pr_domainname, domain, 1565 sizeof(pr->pr_domainname)); 1566 if (uuid != NULL) 1567 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1568 if (gothid) 1569 pr->pr_hostid = hid; 1570 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1571 if (tpr->pr_flags & PR_HOST) 1572 descend = 0; 1573 else { 1574 if (host != NULL) 1575 strlcpy(tpr->pr_hostname, 1576 pr->pr_hostname, 1577 sizeof(tpr->pr_hostname)); 1578 if (domain != NULL) 1579 strlcpy(tpr->pr_domainname, 1580 pr->pr_domainname, 1581 sizeof(tpr->pr_domainname)); 1582 if (uuid != NULL) 1583 strlcpy(tpr->pr_hostuuid, 1584 pr->pr_hostuuid, 1585 sizeof(tpr->pr_hostuuid)); 1586 if (gothid) 1587 tpr->pr_hostid = hid; 1588 } 1589 } 1590 } 1591 if ((tallow = ch_allow & ~pr_allow)) { 1592 /* Clear allow bits in all children. */ 1593 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1594 tpr->pr_allow &= ~tallow; 1595 } 1596 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1597 /* 1598 * Persistent prisons get an extra reference, and prisons losing their 1599 * persist flag lose that reference. Only do this for existing prisons 1600 * for now, so new ones will remain unseen until after the module 1601 * handlers have completed. 1602 */ 1603 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1604 if (pr_flags & PR_PERSIST) { 1605 pr->pr_ref++; 1606 pr->pr_uref++; 1607 } else { 1608 pr->pr_ref--; 1609 pr->pr_uref--; 1610 } 1611 } 1612 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1613 mtx_unlock(&pr->pr_mtx); 1614 1615 /* Locks may have prevented a complete restriction of child IP 1616 * addresses. If so, allocate some more memory and try again. 1617 */ 1618 #ifdef INET 1619 while (redo_ip4) { 1620 ip4s = pr->pr_ip4s; 1621 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1622 mtx_lock(&pr->pr_mtx); 1623 redo_ip4 = 0; 1624 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1625 #ifdef VIMAGE 1626 if (tpr->pr_flags & PR_VNET) { 1627 descend = 0; 1628 continue; 1629 } 1630 #endif 1631 if (prison_restrict_ip4(tpr, ip4)) { 1632 if (ip4 != NULL) 1633 ip4 = NULL; 1634 else 1635 redo_ip4 = 1; 1636 } 1637 } 1638 mtx_unlock(&pr->pr_mtx); 1639 } 1640 #endif 1641 #ifdef INET6 1642 while (redo_ip6) { 1643 ip6s = pr->pr_ip6s; 1644 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1645 mtx_lock(&pr->pr_mtx); 1646 redo_ip6 = 0; 1647 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1648 #ifdef VIMAGE 1649 if (tpr->pr_flags & PR_VNET) { 1650 descend = 0; 1651 continue; 1652 } 1653 #endif 1654 if (prison_restrict_ip6(tpr, ip6)) { 1655 if (ip6 != NULL) 1656 ip6 = NULL; 1657 else 1658 redo_ip6 = 1; 1659 } 1660 } 1661 mtx_unlock(&pr->pr_mtx); 1662 } 1663 #endif 1664 1665 /* Let the modules do their work. */ 1666 sx_downgrade(&allprison_lock); 1667 if (created) { 1668 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1669 if (error) { 1670 prison_deref(pr, PD_LIST_SLOCKED); 1671 goto done_errmsg; 1672 } 1673 } 1674 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1675 if (error) { 1676 prison_deref(pr, created 1677 ? PD_LIST_SLOCKED 1678 : PD_DEREF | PD_LIST_SLOCKED); 1679 goto done_errmsg; 1680 } 1681 1682 /* Attach this process to the prison if requested. */ 1683 if (flags & JAIL_ATTACH) { 1684 mtx_lock(&pr->pr_mtx); 1685 error = do_jail_attach(td, pr); 1686 if (error) { 1687 vfs_opterror(opts, "attach failed"); 1688 if (!created) 1689 prison_deref(pr, PD_DEREF); 1690 goto done_errmsg; 1691 } 1692 } 1693 1694 /* 1695 * Now that it is all there, drop the temporary reference from existing 1696 * prisons. Or add a reference to newly created persistent prisons 1697 * (which was not done earlier so that the prison would not be publicly 1698 * visible). 1699 */ 1700 if (!created) { 1701 prison_deref(pr, (flags & JAIL_ATTACH) 1702 ? PD_DEREF 1703 : PD_DEREF | PD_LIST_SLOCKED); 1704 } else { 1705 if (pr_flags & PR_PERSIST) { 1706 mtx_lock(&pr->pr_mtx); 1707 pr->pr_ref++; 1708 pr->pr_uref++; 1709 mtx_unlock(&pr->pr_mtx); 1710 } 1711 if (!(flags & JAIL_ATTACH)) 1712 sx_sunlock(&allprison_lock); 1713 } 1714 td->td_retval[0] = pr->pr_id; 1715 goto done_errmsg; 1716 1717 done_deref_locked: 1718 prison_deref(pr, created 1719 ? PD_LOCKED | PD_LIST_XLOCKED 1720 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1721 goto done_releroot; 1722 done_unlock_list: 1723 sx_xunlock(&allprison_lock); 1724 done_releroot: 1725 if (root != NULL) { 1726 vfslocked = VFS_LOCK_GIANT(root->v_mount); 1727 vrele(root); 1728 VFS_UNLOCK_GIANT(vfslocked); 1729 } 1730 done_errmsg: 1731 if (error) { 1732 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1733 if (errmsg_len > 0) { 1734 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1735 if (errmsg_pos > 0) { 1736 if (optuio->uio_segflg == UIO_SYSSPACE) 1737 bcopy(errmsg, 1738 optuio->uio_iov[errmsg_pos].iov_base, 1739 errmsg_len); 1740 else 1741 copyout(errmsg, 1742 optuio->uio_iov[errmsg_pos].iov_base, 1743 errmsg_len); 1744 } 1745 } 1746 } 1747 done_free: 1748 #ifdef INET 1749 free(ip4, M_PRISON); 1750 #endif 1751 #ifdef INET6 1752 free(ip6, M_PRISON); 1753 #endif 1754 vfs_freeopts(opts); 1755 return (error); 1756 } 1757 1758 1759 /* 1760 * struct jail_get_args { 1761 * struct iovec *iovp; 1762 * unsigned int iovcnt; 1763 * int flags; 1764 * }; 1765 */ 1766 int 1767 jail_get(struct thread *td, struct jail_get_args *uap) 1768 { 1769 struct uio *auio; 1770 int error; 1771 1772 /* Check that we have an even number of iovecs. */ 1773 if (uap->iovcnt & 1) 1774 return (EINVAL); 1775 1776 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1777 if (error) 1778 return (error); 1779 error = kern_jail_get(td, auio, uap->flags); 1780 if (error == 0) 1781 error = copyout(auio->uio_iov, uap->iovp, 1782 uap->iovcnt * sizeof (struct iovec)); 1783 free(auio, M_IOV); 1784 return (error); 1785 } 1786 1787 int 1788 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1789 { 1790 struct prison *pr, *mypr; 1791 struct vfsopt *opt; 1792 struct vfsoptlist *opts; 1793 char *errmsg, *name; 1794 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1795 1796 if (flags & ~JAIL_GET_MASK) 1797 return (EINVAL); 1798 1799 /* Get the parameter list. */ 1800 error = vfs_buildopts(optuio, &opts); 1801 if (error) 1802 return (error); 1803 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1804 mypr = td->td_ucred->cr_prison; 1805 1806 /* 1807 * Find the prison specified by one of: lastjid, jid, name. 1808 */ 1809 sx_slock(&allprison_lock); 1810 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1811 if (error == 0) { 1812 TAILQ_FOREACH(pr, &allprison, pr_list) { 1813 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1814 mtx_lock(&pr->pr_mtx); 1815 if (pr->pr_ref > 0 && 1816 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1817 break; 1818 mtx_unlock(&pr->pr_mtx); 1819 } 1820 } 1821 if (pr != NULL) 1822 goto found_prison; 1823 error = ENOENT; 1824 vfs_opterror(opts, "no jail after %d", jid); 1825 goto done_unlock_list; 1826 } else if (error != ENOENT) 1827 goto done_unlock_list; 1828 1829 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1830 if (error == 0) { 1831 if (jid != 0) { 1832 pr = prison_find_child(mypr, jid); 1833 if (pr != NULL) { 1834 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1835 mtx_unlock(&pr->pr_mtx); 1836 error = ENOENT; 1837 vfs_opterror(opts, "jail %d is dying", 1838 jid); 1839 goto done_unlock_list; 1840 } 1841 goto found_prison; 1842 } 1843 error = ENOENT; 1844 vfs_opterror(opts, "jail %d not found", jid); 1845 goto done_unlock_list; 1846 } 1847 } else if (error != ENOENT) 1848 goto done_unlock_list; 1849 1850 error = vfs_getopt(opts, "name", (void **)&name, &len); 1851 if (error == 0) { 1852 if (len == 0 || name[len - 1] != '\0') { 1853 error = EINVAL; 1854 goto done_unlock_list; 1855 } 1856 pr = prison_find_name(mypr, name); 1857 if (pr != NULL) { 1858 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1859 mtx_unlock(&pr->pr_mtx); 1860 error = ENOENT; 1861 vfs_opterror(opts, "jail \"%s\" is dying", 1862 name); 1863 goto done_unlock_list; 1864 } 1865 goto found_prison; 1866 } 1867 error = ENOENT; 1868 vfs_opterror(opts, "jail \"%s\" not found", name); 1869 goto done_unlock_list; 1870 } else if (error != ENOENT) 1871 goto done_unlock_list; 1872 1873 vfs_opterror(opts, "no jail specified"); 1874 error = ENOENT; 1875 goto done_unlock_list; 1876 1877 found_prison: 1878 /* Get the parameters of the prison. */ 1879 pr->pr_ref++; 1880 locked = PD_LOCKED; 1881 td->td_retval[0] = pr->pr_id; 1882 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 1883 if (error != 0 && error != ENOENT) 1884 goto done_deref; 1885 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 1886 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 1887 if (error != 0 && error != ENOENT) 1888 goto done_deref; 1889 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 1890 if (error != 0 && error != ENOENT) 1891 goto done_deref; 1892 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 1893 sizeof(pr->pr_cpuset->cs_id)); 1894 if (error != 0 && error != ENOENT) 1895 goto done_deref; 1896 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 1897 if (error != 0 && error != ENOENT) 1898 goto done_deref; 1899 #ifdef INET 1900 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 1901 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1902 if (error != 0 && error != ENOENT) 1903 goto done_deref; 1904 #endif 1905 #ifdef INET6 1906 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 1907 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1908 if (error != 0 && error != ENOENT) 1909 goto done_deref; 1910 #endif 1911 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 1912 sizeof(pr->pr_securelevel)); 1913 if (error != 0 && error != ENOENT) 1914 goto done_deref; 1915 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 1916 sizeof(pr->pr_childcount)); 1917 if (error != 0 && error != ENOENT) 1918 goto done_deref; 1919 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 1920 sizeof(pr->pr_childmax)); 1921 if (error != 0 && error != ENOENT) 1922 goto done_deref; 1923 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 1924 if (error != 0 && error != ENOENT) 1925 goto done_deref; 1926 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 1927 if (error != 0 && error != ENOENT) 1928 goto done_deref; 1929 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 1930 if (error != 0 && error != ENOENT) 1931 goto done_deref; 1932 #ifdef COMPAT_IA32 1933 if (td->td_proc->p_sysent->sv_flags & SV_IA32) { 1934 uint32_t hid32 = pr->pr_hostid; 1935 1936 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 1937 } else 1938 #endif 1939 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 1940 sizeof(pr->pr_hostid)); 1941 if (error != 0 && error != ENOENT) 1942 goto done_deref; 1943 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 1944 sizeof(pr->pr_enforce_statfs)); 1945 if (error != 0 && error != ENOENT) 1946 goto done_deref; 1947 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 1948 fi++) { 1949 if (pr_flag_names[fi] == NULL) 1950 continue; 1951 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 1952 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 1953 if (error != 0 && error != ENOENT) 1954 goto done_deref; 1955 i = !i; 1956 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 1957 if (error != 0 && error != ENOENT) 1958 goto done_deref; 1959 } 1960 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 1961 fi++) { 1962 i = pr->pr_flags & 1963 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 1964 i = pr_flag_jailsys[fi].disable && 1965 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 1966 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 1967 : JAIL_SYS_INHERIT; 1968 error = 1969 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 1970 if (error != 0 && error != ENOENT) 1971 goto done_deref; 1972 } 1973 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 1974 fi++) { 1975 if (pr_allow_names[fi] == NULL) 1976 continue; 1977 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 1978 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 1979 if (error != 0 && error != ENOENT) 1980 goto done_deref; 1981 i = !i; 1982 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 1983 if (error != 0 && error != ENOENT) 1984 goto done_deref; 1985 } 1986 i = (pr->pr_uref == 0); 1987 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 1988 if (error != 0 && error != ENOENT) 1989 goto done_deref; 1990 i = !i; 1991 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 1992 if (error != 0 && error != ENOENT) 1993 goto done_deref; 1994 1995 /* Get the module parameters. */ 1996 mtx_unlock(&pr->pr_mtx); 1997 locked = 0; 1998 error = osd_jail_call(pr, PR_METHOD_GET, opts); 1999 if (error) 2000 goto done_deref; 2001 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2002 2003 /* By now, all parameters should have been noted. */ 2004 TAILQ_FOREACH(opt, opts, link) { 2005 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2006 error = EINVAL; 2007 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2008 goto done_errmsg; 2009 } 2010 } 2011 2012 /* Write the fetched parameters back to userspace. */ 2013 error = 0; 2014 TAILQ_FOREACH(opt, opts, link) { 2015 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2016 pos = 2 * opt->pos + 1; 2017 optuio->uio_iov[pos].iov_len = opt->len; 2018 if (opt->value != NULL) { 2019 if (optuio->uio_segflg == UIO_SYSSPACE) { 2020 bcopy(opt->value, 2021 optuio->uio_iov[pos].iov_base, 2022 opt->len); 2023 } else { 2024 error = copyout(opt->value, 2025 optuio->uio_iov[pos].iov_base, 2026 opt->len); 2027 if (error) 2028 break; 2029 } 2030 } 2031 } 2032 } 2033 goto done_errmsg; 2034 2035 done_deref: 2036 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2037 goto done_errmsg; 2038 2039 done_unlock_list: 2040 sx_sunlock(&allprison_lock); 2041 done_errmsg: 2042 if (error && errmsg_pos >= 0) { 2043 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2044 errmsg_pos = 2 * errmsg_pos + 1; 2045 if (errmsg_len > 0) { 2046 if (optuio->uio_segflg == UIO_SYSSPACE) 2047 bcopy(errmsg, 2048 optuio->uio_iov[errmsg_pos].iov_base, 2049 errmsg_len); 2050 else 2051 copyout(errmsg, 2052 optuio->uio_iov[errmsg_pos].iov_base, 2053 errmsg_len); 2054 } 2055 } 2056 vfs_freeopts(opts); 2057 return (error); 2058 } 2059 2060 2061 /* 2062 * struct jail_remove_args { 2063 * int jid; 2064 * }; 2065 */ 2066 int 2067 jail_remove(struct thread *td, struct jail_remove_args *uap) 2068 { 2069 struct prison *pr, *cpr, *lpr, *tpr; 2070 int descend, error; 2071 2072 error = priv_check(td, PRIV_JAIL_REMOVE); 2073 if (error) 2074 return (error); 2075 2076 sx_xlock(&allprison_lock); 2077 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2078 if (pr == NULL) { 2079 sx_xunlock(&allprison_lock); 2080 return (EINVAL); 2081 } 2082 2083 /* Remove all descendants of this prison, then remove this prison. */ 2084 pr->pr_ref++; 2085 pr->pr_flags |= PR_REMOVE; 2086 if (!LIST_EMPTY(&pr->pr_children)) { 2087 mtx_unlock(&pr->pr_mtx); 2088 lpr = NULL; 2089 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2090 mtx_lock(&cpr->pr_mtx); 2091 if (cpr->pr_ref > 0) { 2092 tpr = cpr; 2093 cpr->pr_ref++; 2094 cpr->pr_flags |= PR_REMOVE; 2095 } else { 2096 /* Already removed - do not do it again. */ 2097 tpr = NULL; 2098 } 2099 mtx_unlock(&cpr->pr_mtx); 2100 if (lpr != NULL) { 2101 mtx_lock(&lpr->pr_mtx); 2102 prison_remove_one(lpr); 2103 sx_xlock(&allprison_lock); 2104 } 2105 lpr = tpr; 2106 } 2107 if (lpr != NULL) { 2108 mtx_lock(&lpr->pr_mtx); 2109 prison_remove_one(lpr); 2110 sx_xlock(&allprison_lock); 2111 } 2112 mtx_lock(&pr->pr_mtx); 2113 } 2114 prison_remove_one(pr); 2115 return (0); 2116 } 2117 2118 static void 2119 prison_remove_one(struct prison *pr) 2120 { 2121 struct proc *p; 2122 int deuref; 2123 2124 /* If the prison was persistent, it is not anymore. */ 2125 deuref = 0; 2126 if (pr->pr_flags & PR_PERSIST) { 2127 pr->pr_ref--; 2128 deuref = PD_DEUREF; 2129 pr->pr_flags &= ~PR_PERSIST; 2130 } 2131 2132 /* 2133 * jail_remove added a reference. If that's the only one, remove 2134 * the prison now. 2135 */ 2136 KASSERT(pr->pr_ref > 0, 2137 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2138 if (pr->pr_ref == 1) { 2139 prison_deref(pr, 2140 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2141 return; 2142 } 2143 2144 mtx_unlock(&pr->pr_mtx); 2145 sx_xunlock(&allprison_lock); 2146 /* 2147 * Kill all processes unfortunate enough to be attached to this prison. 2148 */ 2149 sx_slock(&allproc_lock); 2150 LIST_FOREACH(p, &allproc, p_list) { 2151 PROC_LOCK(p); 2152 if (p->p_state != PRS_NEW && p->p_ucred && 2153 p->p_ucred->cr_prison == pr) 2154 psignal(p, SIGKILL); 2155 PROC_UNLOCK(p); 2156 } 2157 sx_sunlock(&allproc_lock); 2158 /* Remove the temporary reference added by jail_remove. */ 2159 prison_deref(pr, deuref | PD_DEREF); 2160 } 2161 2162 2163 /* 2164 * struct jail_attach_args { 2165 * int jid; 2166 * }; 2167 */ 2168 int 2169 jail_attach(struct thread *td, struct jail_attach_args *uap) 2170 { 2171 struct prison *pr; 2172 int error; 2173 2174 error = priv_check(td, PRIV_JAIL_ATTACH); 2175 if (error) 2176 return (error); 2177 2178 sx_slock(&allprison_lock); 2179 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2180 if (pr == NULL) { 2181 sx_sunlock(&allprison_lock); 2182 return (EINVAL); 2183 } 2184 2185 /* 2186 * Do not allow a process to attach to a prison that is not 2187 * considered to be "alive". 2188 */ 2189 if (pr->pr_uref == 0) { 2190 mtx_unlock(&pr->pr_mtx); 2191 sx_sunlock(&allprison_lock); 2192 return (EINVAL); 2193 } 2194 2195 return (do_jail_attach(td, pr)); 2196 } 2197 2198 static int 2199 do_jail_attach(struct thread *td, struct prison *pr) 2200 { 2201 struct prison *ppr; 2202 struct proc *p; 2203 struct ucred *newcred, *oldcred; 2204 int vfslocked, error; 2205 2206 /* 2207 * XXX: Note that there is a slight race here if two threads 2208 * in the same privileged process attempt to attach to two 2209 * different jails at the same time. It is important for 2210 * user processes not to do this, or they might end up with 2211 * a process root from one prison, but attached to the jail 2212 * of another. 2213 */ 2214 pr->pr_ref++; 2215 pr->pr_uref++; 2216 mtx_unlock(&pr->pr_mtx); 2217 2218 /* Let modules do whatever they need to prepare for attaching. */ 2219 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2220 if (error) { 2221 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2222 return (error); 2223 } 2224 sx_sunlock(&allprison_lock); 2225 2226 /* 2227 * Reparent the newly attached process to this jail. 2228 */ 2229 ppr = td->td_ucred->cr_prison; 2230 p = td->td_proc; 2231 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2232 if (error) 2233 goto e_revert_osd; 2234 2235 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount); 2236 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2237 if ((error = change_dir(pr->pr_root, td)) != 0) 2238 goto e_unlock; 2239 #ifdef MAC 2240 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2241 goto e_unlock; 2242 #endif 2243 VOP_UNLOCK(pr->pr_root, 0); 2244 if ((error = change_root(pr->pr_root, td))) 2245 goto e_unlock_giant; 2246 VFS_UNLOCK_GIANT(vfslocked); 2247 2248 newcred = crget(); 2249 PROC_LOCK(p); 2250 oldcred = p->p_ucred; 2251 setsugid(p); 2252 crcopy(newcred, oldcred); 2253 newcred->cr_prison = pr; 2254 p->p_ucred = newcred; 2255 PROC_UNLOCK(p); 2256 crfree(oldcred); 2257 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2258 return (0); 2259 e_unlock: 2260 VOP_UNLOCK(pr->pr_root, 0); 2261 e_unlock_giant: 2262 VFS_UNLOCK_GIANT(vfslocked); 2263 e_revert_osd: 2264 /* Tell modules this thread is still in its old jail after all. */ 2265 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2266 prison_deref(pr, PD_DEREF | PD_DEUREF); 2267 return (error); 2268 } 2269 2270 2271 /* 2272 * Returns a locked prison instance, or NULL on failure. 2273 */ 2274 struct prison * 2275 prison_find(int prid) 2276 { 2277 struct prison *pr; 2278 2279 sx_assert(&allprison_lock, SX_LOCKED); 2280 TAILQ_FOREACH(pr, &allprison, pr_list) { 2281 if (pr->pr_id == prid) { 2282 mtx_lock(&pr->pr_mtx); 2283 if (pr->pr_ref > 0) 2284 return (pr); 2285 mtx_unlock(&pr->pr_mtx); 2286 } 2287 } 2288 return (NULL); 2289 } 2290 2291 /* 2292 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2293 */ 2294 struct prison * 2295 prison_find_child(struct prison *mypr, int prid) 2296 { 2297 struct prison *pr; 2298 int descend; 2299 2300 sx_assert(&allprison_lock, SX_LOCKED); 2301 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2302 if (pr->pr_id == prid) { 2303 mtx_lock(&pr->pr_mtx); 2304 if (pr->pr_ref > 0) 2305 return (pr); 2306 mtx_unlock(&pr->pr_mtx); 2307 } 2308 } 2309 return (NULL); 2310 } 2311 2312 /* 2313 * Look for the name relative to mypr. Returns a locked prison or NULL. 2314 */ 2315 struct prison * 2316 prison_find_name(struct prison *mypr, const char *name) 2317 { 2318 struct prison *pr, *deadpr; 2319 size_t mylen; 2320 int descend; 2321 2322 sx_assert(&allprison_lock, SX_LOCKED); 2323 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2324 again: 2325 deadpr = NULL; 2326 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2327 if (!strcmp(pr->pr_name + mylen, name)) { 2328 mtx_lock(&pr->pr_mtx); 2329 if (pr->pr_ref > 0) { 2330 if (pr->pr_uref > 0) 2331 return (pr); 2332 deadpr = pr; 2333 } 2334 mtx_unlock(&pr->pr_mtx); 2335 } 2336 } 2337 /* There was no valid prison - perhaps there was a dying one. */ 2338 if (deadpr != NULL) { 2339 mtx_lock(&deadpr->pr_mtx); 2340 if (deadpr->pr_ref == 0) { 2341 mtx_unlock(&deadpr->pr_mtx); 2342 goto again; 2343 } 2344 } 2345 return (deadpr); 2346 } 2347 2348 /* 2349 * See if a prison has the specific flag set. 2350 */ 2351 int 2352 prison_flag(struct ucred *cred, unsigned flag) 2353 { 2354 2355 /* This is an atomic read, so no locking is necessary. */ 2356 return (cred->cr_prison->pr_flags & flag); 2357 } 2358 2359 int 2360 prison_allow(struct ucred *cred, unsigned flag) 2361 { 2362 2363 /* This is an atomic read, so no locking is necessary. */ 2364 return (cred->cr_prison->pr_allow & flag); 2365 } 2366 2367 /* 2368 * Remove a prison reference. If that was the last reference, remove the 2369 * prison itself - but not in this context in case there are locks held. 2370 */ 2371 void 2372 prison_free_locked(struct prison *pr) 2373 { 2374 2375 mtx_assert(&pr->pr_mtx, MA_OWNED); 2376 pr->pr_ref--; 2377 if (pr->pr_ref == 0) { 2378 mtx_unlock(&pr->pr_mtx); 2379 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2380 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2381 return; 2382 } 2383 mtx_unlock(&pr->pr_mtx); 2384 } 2385 2386 void 2387 prison_free(struct prison *pr) 2388 { 2389 2390 mtx_lock(&pr->pr_mtx); 2391 prison_free_locked(pr); 2392 } 2393 2394 static void 2395 prison_complete(void *context, int pending) 2396 { 2397 2398 prison_deref((struct prison *)context, 0); 2399 } 2400 2401 /* 2402 * Remove a prison reference (usually). This internal version assumes no 2403 * mutexes are held, except perhaps the prison itself. If there are no more 2404 * references, release and delist the prison. On completion, the prison lock 2405 * and the allprison lock are both unlocked. 2406 */ 2407 static void 2408 prison_deref(struct prison *pr, int flags) 2409 { 2410 struct prison *ppr, *tpr; 2411 int vfslocked; 2412 2413 if (!(flags & PD_LOCKED)) 2414 mtx_lock(&pr->pr_mtx); 2415 /* Decrement the user references in a separate loop. */ 2416 if (flags & PD_DEUREF) { 2417 for (tpr = pr;; tpr = tpr->pr_parent) { 2418 if (tpr != pr) 2419 mtx_lock(&tpr->pr_mtx); 2420 if (--tpr->pr_uref > 0) 2421 break; 2422 KASSERT(tpr != &prison0, ("prison0 pr_uref=0")); 2423 mtx_unlock(&tpr->pr_mtx); 2424 } 2425 /* Done if there were only user references to remove. */ 2426 if (!(flags & PD_DEREF)) { 2427 mtx_unlock(&tpr->pr_mtx); 2428 if (flags & PD_LIST_SLOCKED) 2429 sx_sunlock(&allprison_lock); 2430 else if (flags & PD_LIST_XLOCKED) 2431 sx_xunlock(&allprison_lock); 2432 return; 2433 } 2434 if (tpr != pr) { 2435 mtx_unlock(&tpr->pr_mtx); 2436 mtx_lock(&pr->pr_mtx); 2437 } 2438 } 2439 2440 for (;;) { 2441 if (flags & PD_DEREF) 2442 pr->pr_ref--; 2443 /* If the prison still has references, nothing else to do. */ 2444 if (pr->pr_ref > 0) { 2445 mtx_unlock(&pr->pr_mtx); 2446 if (flags & PD_LIST_SLOCKED) 2447 sx_sunlock(&allprison_lock); 2448 else if (flags & PD_LIST_XLOCKED) 2449 sx_xunlock(&allprison_lock); 2450 return; 2451 } 2452 2453 mtx_unlock(&pr->pr_mtx); 2454 if (flags & PD_LIST_SLOCKED) { 2455 if (!sx_try_upgrade(&allprison_lock)) { 2456 sx_sunlock(&allprison_lock); 2457 sx_xlock(&allprison_lock); 2458 } 2459 } else if (!(flags & PD_LIST_XLOCKED)) 2460 sx_xlock(&allprison_lock); 2461 2462 TAILQ_REMOVE(&allprison, pr, pr_list); 2463 LIST_REMOVE(pr, pr_sibling); 2464 ppr = pr->pr_parent; 2465 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2466 tpr->pr_childcount--; 2467 sx_xunlock(&allprison_lock); 2468 2469 #ifdef VIMAGE 2470 if (pr->pr_vnet != ppr->pr_vnet) 2471 vnet_destroy(pr->pr_vnet); 2472 #endif 2473 if (pr->pr_root != NULL) { 2474 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount); 2475 vrele(pr->pr_root); 2476 VFS_UNLOCK_GIANT(vfslocked); 2477 } 2478 mtx_destroy(&pr->pr_mtx); 2479 #ifdef INET 2480 free(pr->pr_ip4, M_PRISON); 2481 #endif 2482 #ifdef INET6 2483 free(pr->pr_ip6, M_PRISON); 2484 #endif 2485 if (pr->pr_cpuset != NULL) 2486 cpuset_rel(pr->pr_cpuset); 2487 osd_jail_exit(pr); 2488 free(pr, M_PRISON); 2489 2490 /* Removing a prison frees a reference on its parent. */ 2491 pr = ppr; 2492 mtx_lock(&pr->pr_mtx); 2493 flags = PD_DEREF; 2494 } 2495 } 2496 2497 void 2498 prison_hold_locked(struct prison *pr) 2499 { 2500 2501 mtx_assert(&pr->pr_mtx, MA_OWNED); 2502 KASSERT(pr->pr_ref > 0, 2503 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2504 pr->pr_ref++; 2505 } 2506 2507 void 2508 prison_hold(struct prison *pr) 2509 { 2510 2511 mtx_lock(&pr->pr_mtx); 2512 prison_hold_locked(pr); 2513 mtx_unlock(&pr->pr_mtx); 2514 } 2515 2516 void 2517 prison_proc_hold(struct prison *pr) 2518 { 2519 2520 mtx_lock(&pr->pr_mtx); 2521 KASSERT(pr->pr_uref > 0, 2522 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2523 pr->pr_uref++; 2524 mtx_unlock(&pr->pr_mtx); 2525 } 2526 2527 void 2528 prison_proc_free(struct prison *pr) 2529 { 2530 2531 mtx_lock(&pr->pr_mtx); 2532 KASSERT(pr->pr_uref > 0, 2533 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2534 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2535 } 2536 2537 2538 #ifdef INET 2539 /* 2540 * Restrict a prison's IP address list with its parent's, possibly replacing 2541 * it. Return true if the replacement buffer was used (or would have been). 2542 */ 2543 static int 2544 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2545 { 2546 int ii, ij, used; 2547 struct prison *ppr; 2548 2549 ppr = pr->pr_parent; 2550 if (!(pr->pr_flags & PR_IP4_USER)) { 2551 /* This has no user settings, so just copy the parent's list. */ 2552 if (pr->pr_ip4s < ppr->pr_ip4s) { 2553 /* 2554 * There's no room for the parent's list. Use the 2555 * new list buffer, which is assumed to be big enough 2556 * (if it was passed). If there's no buffer, try to 2557 * allocate one. 2558 */ 2559 used = 1; 2560 if (newip4 == NULL) { 2561 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2562 M_PRISON, M_NOWAIT); 2563 if (newip4 != NULL) 2564 used = 0; 2565 } 2566 if (newip4 != NULL) { 2567 bcopy(ppr->pr_ip4, newip4, 2568 ppr->pr_ip4s * sizeof(*newip4)); 2569 free(pr->pr_ip4, M_PRISON); 2570 pr->pr_ip4 = newip4; 2571 pr->pr_ip4s = ppr->pr_ip4s; 2572 } 2573 return (used); 2574 } 2575 pr->pr_ip4s = ppr->pr_ip4s; 2576 if (pr->pr_ip4s > 0) 2577 bcopy(ppr->pr_ip4, pr->pr_ip4, 2578 pr->pr_ip4s * sizeof(*newip4)); 2579 else if (pr->pr_ip4 != NULL) { 2580 free(pr->pr_ip4, M_PRISON); 2581 pr->pr_ip4 = NULL; 2582 } 2583 } else if (pr->pr_ip4s > 0) { 2584 /* Remove addresses that aren't in the parent. */ 2585 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2586 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2587 break; 2588 if (ij < ppr->pr_ip4s) 2589 ii = 1; 2590 else { 2591 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2592 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2593 ii = 0; 2594 } 2595 for (ij = 1; ii < pr->pr_ip4s; ) { 2596 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2597 ii++; 2598 continue; 2599 } 2600 switch (ij >= ppr->pr_ip4s ? -1 : 2601 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2602 case -1: 2603 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2604 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2605 break; 2606 case 0: 2607 ii++; 2608 ij++; 2609 break; 2610 case 1: 2611 ij++; 2612 break; 2613 } 2614 } 2615 if (pr->pr_ip4s == 0) { 2616 pr->pr_flags |= PR_IP4_DISABLE; 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 * No need to lock since the PR_IP4_USER flag can't be altered for 2671 * existing prisons. 2672 */ 2673 while (pr1 != &prison0 && 2674 #ifdef VIMAGE 2675 !(pr1->pr_flags & PR_VNET) && 2676 #endif 2677 !(pr1->pr_flags & PR_IP4_USER)) 2678 pr1 = pr1->pr_parent; 2679 while (pr2 != &prison0 && 2680 #ifdef VIMAGE 2681 !(pr2->pr_flags & PR_VNET) && 2682 #endif 2683 !(pr2->pr_flags & PR_IP4_USER)) 2684 pr2 = pr2->pr_parent; 2685 return (pr1 == pr2); 2686 } 2687 2688 /* 2689 * Make sure our (source) address is set to something meaningful to this 2690 * jail. 2691 * 2692 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2693 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2694 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2695 */ 2696 int 2697 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2698 { 2699 struct prison *pr; 2700 struct in_addr ia0; 2701 int error; 2702 2703 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2704 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2705 2706 pr = cred->cr_prison; 2707 if (!(pr->pr_flags & PR_IP4)) 2708 return (0); 2709 mtx_lock(&pr->pr_mtx); 2710 if (!(pr->pr_flags & PR_IP4)) { 2711 mtx_unlock(&pr->pr_mtx); 2712 return (0); 2713 } 2714 if (pr->pr_ip4 == NULL) { 2715 mtx_unlock(&pr->pr_mtx); 2716 return (EAFNOSUPPORT); 2717 } 2718 2719 ia0.s_addr = ntohl(ia->s_addr); 2720 if (ia0.s_addr == INADDR_LOOPBACK) { 2721 ia->s_addr = pr->pr_ip4[0].s_addr; 2722 mtx_unlock(&pr->pr_mtx); 2723 return (0); 2724 } 2725 2726 if (ia0.s_addr == INADDR_ANY) { 2727 /* 2728 * In case there is only 1 IPv4 address, bind directly. 2729 */ 2730 if (pr->pr_ip4s == 1) 2731 ia->s_addr = pr->pr_ip4[0].s_addr; 2732 mtx_unlock(&pr->pr_mtx); 2733 return (0); 2734 } 2735 2736 error = _prison_check_ip4(pr, ia); 2737 mtx_unlock(&pr->pr_mtx); 2738 return (error); 2739 } 2740 2741 /* 2742 * Rewrite destination address in case we will connect to loopback address. 2743 * 2744 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2745 * Address passed in in NBO and returned in NBO. 2746 */ 2747 int 2748 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2749 { 2750 struct prison *pr; 2751 2752 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2753 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2754 2755 pr = cred->cr_prison; 2756 if (!(pr->pr_flags & PR_IP4)) 2757 return (0); 2758 mtx_lock(&pr->pr_mtx); 2759 if (!(pr->pr_flags & PR_IP4)) { 2760 mtx_unlock(&pr->pr_mtx); 2761 return (0); 2762 } 2763 if (pr->pr_ip4 == NULL) { 2764 mtx_unlock(&pr->pr_mtx); 2765 return (EAFNOSUPPORT); 2766 } 2767 2768 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2769 ia->s_addr = pr->pr_ip4[0].s_addr; 2770 mtx_unlock(&pr->pr_mtx); 2771 return (0); 2772 } 2773 2774 /* 2775 * Return success because nothing had to be changed. 2776 */ 2777 mtx_unlock(&pr->pr_mtx); 2778 return (0); 2779 } 2780 2781 /* 2782 * Check if given address belongs to the jail referenced by cred/prison. 2783 * 2784 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2785 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2786 * doesn't allow IPv4. Address passed in in NBO. 2787 */ 2788 static int 2789 _prison_check_ip4(struct prison *pr, struct in_addr *ia) 2790 { 2791 int i, a, z, d; 2792 2793 /* 2794 * Check the primary IP. 2795 */ 2796 if (pr->pr_ip4[0].s_addr == ia->s_addr) 2797 return (0); 2798 2799 /* 2800 * All the other IPs are sorted so we can do a binary search. 2801 */ 2802 a = 0; 2803 z = pr->pr_ip4s - 2; 2804 while (a <= z) { 2805 i = (a + z) / 2; 2806 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 2807 if (d > 0) 2808 z = i - 1; 2809 else if (d < 0) 2810 a = i + 1; 2811 else 2812 return (0); 2813 } 2814 2815 return (EADDRNOTAVAIL); 2816 } 2817 2818 int 2819 prison_check_ip4(struct ucred *cred, struct in_addr *ia) 2820 { 2821 struct prison *pr; 2822 int error; 2823 2824 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2825 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2826 2827 pr = cred->cr_prison; 2828 if (!(pr->pr_flags & PR_IP4)) 2829 return (0); 2830 mtx_lock(&pr->pr_mtx); 2831 if (!(pr->pr_flags & PR_IP4)) { 2832 mtx_unlock(&pr->pr_mtx); 2833 return (0); 2834 } 2835 if (pr->pr_ip4 == NULL) { 2836 mtx_unlock(&pr->pr_mtx); 2837 return (EAFNOSUPPORT); 2838 } 2839 2840 error = _prison_check_ip4(pr, ia); 2841 mtx_unlock(&pr->pr_mtx); 2842 return (error); 2843 } 2844 #endif 2845 2846 #ifdef INET6 2847 static int 2848 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 2849 { 2850 int ii, ij, used; 2851 struct prison *ppr; 2852 2853 ppr = pr->pr_parent; 2854 if (!(pr->pr_flags & PR_IP6_USER)) { 2855 /* This has no user settings, so just copy the parent's list. */ 2856 if (pr->pr_ip6s < ppr->pr_ip6s) { 2857 /* 2858 * There's no room for the parent's list. Use the 2859 * new list buffer, which is assumed to be big enough 2860 * (if it was passed). If there's no buffer, try to 2861 * allocate one. 2862 */ 2863 used = 1; 2864 if (newip6 == NULL) { 2865 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 2866 M_PRISON, M_NOWAIT); 2867 if (newip6 != NULL) 2868 used = 0; 2869 } 2870 if (newip6 != NULL) { 2871 bcopy(ppr->pr_ip6, newip6, 2872 ppr->pr_ip6s * sizeof(*newip6)); 2873 free(pr->pr_ip6, M_PRISON); 2874 pr->pr_ip6 = newip6; 2875 pr->pr_ip6s = ppr->pr_ip6s; 2876 } 2877 return (used); 2878 } 2879 pr->pr_ip6s = ppr->pr_ip6s; 2880 if (pr->pr_ip6s > 0) 2881 bcopy(ppr->pr_ip6, pr->pr_ip6, 2882 pr->pr_ip6s * sizeof(*newip6)); 2883 else if (pr->pr_ip6 != NULL) { 2884 free(pr->pr_ip6, M_PRISON); 2885 pr->pr_ip6 = NULL; 2886 } 2887 } else if (pr->pr_ip6s > 0) { 2888 /* Remove addresses that aren't in the parent. */ 2889 for (ij = 0; ij < ppr->pr_ip6s; ij++) 2890 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 2891 &ppr->pr_ip6[ij])) 2892 break; 2893 if (ij < ppr->pr_ip6s) 2894 ii = 1; 2895 else { 2896 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 2897 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2898 ii = 0; 2899 } 2900 for (ij = 1; ii < pr->pr_ip6s; ) { 2901 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 2902 &ppr->pr_ip6[0])) { 2903 ii++; 2904 continue; 2905 } 2906 switch (ij >= ppr->pr_ip4s ? -1 : 2907 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 2908 case -1: 2909 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 2910 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 2911 break; 2912 case 0: 2913 ii++; 2914 ij++; 2915 break; 2916 case 1: 2917 ij++; 2918 break; 2919 } 2920 } 2921 if (pr->pr_ip6s == 0) { 2922 pr->pr_flags |= PR_IP6_DISABLE; 2923 free(pr->pr_ip6, M_PRISON); 2924 pr->pr_ip6 = NULL; 2925 } 2926 } 2927 return 0; 2928 } 2929 2930 /* 2931 * Pass back primary IPv6 address for this jail. 2932 * 2933 * If not restricted return success but do not alter the address. Caller has 2934 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 2935 * 2936 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 2937 */ 2938 int 2939 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 2940 { 2941 struct prison *pr; 2942 2943 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2944 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 2945 2946 pr = cred->cr_prison; 2947 if (!(pr->pr_flags & PR_IP6)) 2948 return (0); 2949 mtx_lock(&pr->pr_mtx); 2950 if (!(pr->pr_flags & PR_IP6)) { 2951 mtx_unlock(&pr->pr_mtx); 2952 return (0); 2953 } 2954 if (pr->pr_ip6 == NULL) { 2955 mtx_unlock(&pr->pr_mtx); 2956 return (EAFNOSUPPORT); 2957 } 2958 2959 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 2960 mtx_unlock(&pr->pr_mtx); 2961 return (0); 2962 } 2963 2964 /* 2965 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 2966 */ 2967 int 2968 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 2969 { 2970 2971 if (pr1 == pr2) 2972 return (1); 2973 2974 while (pr1 != &prison0 && 2975 #ifdef VIMAGE 2976 !(pr1->pr_flags & PR_VNET) && 2977 #endif 2978 !(pr1->pr_flags & PR_IP6_USER)) 2979 pr1 = pr1->pr_parent; 2980 while (pr2 != &prison0 && 2981 #ifdef VIMAGE 2982 !(pr2->pr_flags & PR_VNET) && 2983 #endif 2984 !(pr2->pr_flags & PR_IP6_USER)) 2985 pr2 = pr2->pr_parent; 2986 return (pr1 == pr2); 2987 } 2988 2989 /* 2990 * Make sure our (source) address is set to something meaningful to this jail. 2991 * 2992 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 2993 * when needed while binding. 2994 * 2995 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 2996 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2997 * doesn't allow IPv6. 2998 */ 2999 int 3000 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3001 { 3002 struct prison *pr; 3003 int error; 3004 3005 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3006 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3007 3008 pr = cred->cr_prison; 3009 if (!(pr->pr_flags & PR_IP6)) 3010 return (0); 3011 mtx_lock(&pr->pr_mtx); 3012 if (!(pr->pr_flags & PR_IP6)) { 3013 mtx_unlock(&pr->pr_mtx); 3014 return (0); 3015 } 3016 if (pr->pr_ip6 == NULL) { 3017 mtx_unlock(&pr->pr_mtx); 3018 return (EAFNOSUPPORT); 3019 } 3020 3021 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3022 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3023 mtx_unlock(&pr->pr_mtx); 3024 return (0); 3025 } 3026 3027 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3028 /* 3029 * In case there is only 1 IPv6 address, and v6only is true, 3030 * then bind directly. 3031 */ 3032 if (v6only != 0 && pr->pr_ip6s == 1) 3033 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3034 mtx_unlock(&pr->pr_mtx); 3035 return (0); 3036 } 3037 3038 error = _prison_check_ip6(pr, ia6); 3039 mtx_unlock(&pr->pr_mtx); 3040 return (error); 3041 } 3042 3043 /* 3044 * Rewrite destination address in case we will connect to loopback address. 3045 * 3046 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3047 */ 3048 int 3049 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3050 { 3051 struct prison *pr; 3052 3053 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3054 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3055 3056 pr = cred->cr_prison; 3057 if (!(pr->pr_flags & PR_IP6)) 3058 return (0); 3059 mtx_lock(&pr->pr_mtx); 3060 if (!(pr->pr_flags & PR_IP6)) { 3061 mtx_unlock(&pr->pr_mtx); 3062 return (0); 3063 } 3064 if (pr->pr_ip6 == NULL) { 3065 mtx_unlock(&pr->pr_mtx); 3066 return (EAFNOSUPPORT); 3067 } 3068 3069 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3070 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3071 mtx_unlock(&pr->pr_mtx); 3072 return (0); 3073 } 3074 3075 /* 3076 * Return success because nothing had to be changed. 3077 */ 3078 mtx_unlock(&pr->pr_mtx); 3079 return (0); 3080 } 3081 3082 /* 3083 * Check if given address belongs to the jail referenced by cred/prison. 3084 * 3085 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3086 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3087 * doesn't allow IPv6. 3088 */ 3089 static int 3090 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3091 { 3092 int i, a, z, d; 3093 3094 /* 3095 * Check the primary IP. 3096 */ 3097 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3098 return (0); 3099 3100 /* 3101 * All the other IPs are sorted so we can do a binary search. 3102 */ 3103 a = 0; 3104 z = pr->pr_ip6s - 2; 3105 while (a <= z) { 3106 i = (a + z) / 2; 3107 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3108 if (d > 0) 3109 z = i - 1; 3110 else if (d < 0) 3111 a = i + 1; 3112 else 3113 return (0); 3114 } 3115 3116 return (EADDRNOTAVAIL); 3117 } 3118 3119 int 3120 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3121 { 3122 struct prison *pr; 3123 int error; 3124 3125 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3126 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3127 3128 pr = cred->cr_prison; 3129 if (!(pr->pr_flags & PR_IP6)) 3130 return (0); 3131 mtx_lock(&pr->pr_mtx); 3132 if (!(pr->pr_flags & PR_IP6)) { 3133 mtx_unlock(&pr->pr_mtx); 3134 return (0); 3135 } 3136 if (pr->pr_ip6 == NULL) { 3137 mtx_unlock(&pr->pr_mtx); 3138 return (EAFNOSUPPORT); 3139 } 3140 3141 error = _prison_check_ip6(pr, ia6); 3142 mtx_unlock(&pr->pr_mtx); 3143 return (error); 3144 } 3145 #endif 3146 3147 /* 3148 * Check if a jail supports the given address family. 3149 * 3150 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3151 * if not. 3152 */ 3153 int 3154 prison_check_af(struct ucred *cred, int af) 3155 { 3156 struct prison *pr; 3157 int error; 3158 3159 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3160 3161 pr = cred->cr_prison; 3162 #ifdef VIMAGE 3163 /* Prisons with their own network stack are not limited. */ 3164 if (pr->pr_flags & PR_VNET) 3165 return (0); 3166 #endif 3167 3168 error = 0; 3169 switch (af) 3170 { 3171 #ifdef INET 3172 case AF_INET: 3173 if (pr->pr_flags & PR_IP4) 3174 { 3175 mtx_lock(&pr->pr_mtx); 3176 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3177 error = EAFNOSUPPORT; 3178 mtx_unlock(&pr->pr_mtx); 3179 } 3180 break; 3181 #endif 3182 #ifdef INET6 3183 case AF_INET6: 3184 if (pr->pr_flags & PR_IP6) 3185 { 3186 mtx_lock(&pr->pr_mtx); 3187 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3188 error = EAFNOSUPPORT; 3189 mtx_unlock(&pr->pr_mtx); 3190 } 3191 break; 3192 #endif 3193 case AF_LOCAL: 3194 case AF_ROUTE: 3195 break; 3196 default: 3197 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3198 error = EAFNOSUPPORT; 3199 } 3200 return (error); 3201 } 3202 3203 /* 3204 * Check if given address belongs to the jail referenced by cred (wrapper to 3205 * prison_check_ip[46]). 3206 * 3207 * Returns 0 if jail doesn't restrict the address family or if address belongs 3208 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3209 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3210 */ 3211 int 3212 prison_if(struct ucred *cred, struct sockaddr *sa) 3213 { 3214 #ifdef INET 3215 struct sockaddr_in *sai; 3216 #endif 3217 #ifdef INET6 3218 struct sockaddr_in6 *sai6; 3219 #endif 3220 int error; 3221 3222 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3223 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3224 3225 error = 0; 3226 switch (sa->sa_family) 3227 { 3228 #ifdef INET 3229 case AF_INET: 3230 sai = (struct sockaddr_in *)sa; 3231 error = prison_check_ip4(cred, &sai->sin_addr); 3232 break; 3233 #endif 3234 #ifdef INET6 3235 case AF_INET6: 3236 sai6 = (struct sockaddr_in6 *)sa; 3237 error = prison_check_ip6(cred, &sai6->sin6_addr); 3238 break; 3239 #endif 3240 default: 3241 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3242 error = EAFNOSUPPORT; 3243 } 3244 return (error); 3245 } 3246 3247 /* 3248 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3249 */ 3250 int 3251 prison_check(struct ucred *cred1, struct ucred *cred2) 3252 { 3253 3254 return ((cred1->cr_prison == cred2->cr_prison || 3255 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3256 } 3257 3258 /* 3259 * Return 1 if p2 is a child of p1, otherwise 0. 3260 */ 3261 int 3262 prison_ischild(struct prison *pr1, struct prison *pr2) 3263 { 3264 3265 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3266 if (pr1 == pr2) 3267 return (1); 3268 return (0); 3269 } 3270 3271 /* 3272 * Return 1 if the passed credential is in a jail, otherwise 0. 3273 */ 3274 int 3275 jailed(struct ucred *cred) 3276 { 3277 3278 return (cred->cr_prison != &prison0); 3279 } 3280 3281 /* 3282 * Return the correct hostname (domainname, et al) for the passed credential. 3283 */ 3284 void 3285 getcredhostname(struct ucred *cred, char *buf, size_t size) 3286 { 3287 struct prison *pr; 3288 3289 /* 3290 * A NULL credential can be used to shortcut to the physical 3291 * system's hostname. 3292 */ 3293 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3294 mtx_lock(&pr->pr_mtx); 3295 strlcpy(buf, pr->pr_hostname, size); 3296 mtx_unlock(&pr->pr_mtx); 3297 } 3298 3299 void 3300 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3301 { 3302 3303 mtx_lock(&cred->cr_prison->pr_mtx); 3304 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3305 mtx_unlock(&cred->cr_prison->pr_mtx); 3306 } 3307 3308 void 3309 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3310 { 3311 3312 mtx_lock(&cred->cr_prison->pr_mtx); 3313 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3314 mtx_unlock(&cred->cr_prison->pr_mtx); 3315 } 3316 3317 void 3318 getcredhostid(struct ucred *cred, unsigned long *hostid) 3319 { 3320 3321 mtx_lock(&cred->cr_prison->pr_mtx); 3322 *hostid = cred->cr_prison->pr_hostid; 3323 mtx_unlock(&cred->cr_prison->pr_mtx); 3324 } 3325 3326 #ifdef VIMAGE 3327 /* 3328 * Determine whether the prison represented by cred owns 3329 * its vnet rather than having it inherited. 3330 * 3331 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3332 */ 3333 int 3334 prison_owns_vnet(struct ucred *cred) 3335 { 3336 3337 /* 3338 * vnets cannot be added/removed after jail creation, 3339 * so no need to lock here. 3340 */ 3341 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3342 } 3343 #endif 3344 3345 /* 3346 * Determine whether the subject represented by cred can "see" 3347 * status of a mount point. 3348 * Returns: 0 for permitted, ENOENT otherwise. 3349 * XXX: This function should be called cr_canseemount() and should be 3350 * placed in kern_prot.c. 3351 */ 3352 int 3353 prison_canseemount(struct ucred *cred, struct mount *mp) 3354 { 3355 struct prison *pr; 3356 struct statfs *sp; 3357 size_t len; 3358 3359 pr = cred->cr_prison; 3360 if (pr->pr_enforce_statfs == 0) 3361 return (0); 3362 if (pr->pr_root->v_mount == mp) 3363 return (0); 3364 if (pr->pr_enforce_statfs == 2) 3365 return (ENOENT); 3366 /* 3367 * If jail's chroot directory is set to "/" we should be able to see 3368 * all mount-points from inside a jail. 3369 * This is ugly check, but this is the only situation when jail's 3370 * directory ends with '/'. 3371 */ 3372 if (strcmp(pr->pr_path, "/") == 0) 3373 return (0); 3374 len = strlen(pr->pr_path); 3375 sp = &mp->mnt_stat; 3376 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3377 return (ENOENT); 3378 /* 3379 * Be sure that we don't have situation where jail's root directory 3380 * is "/some/path" and mount point is "/some/pathpath". 3381 */ 3382 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3383 return (ENOENT); 3384 return (0); 3385 } 3386 3387 void 3388 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3389 { 3390 char jpath[MAXPATHLEN]; 3391 struct prison *pr; 3392 size_t len; 3393 3394 pr = cred->cr_prison; 3395 if (pr->pr_enforce_statfs == 0) 3396 return; 3397 if (prison_canseemount(cred, mp) != 0) { 3398 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3399 strlcpy(sp->f_mntonname, "[restricted]", 3400 sizeof(sp->f_mntonname)); 3401 return; 3402 } 3403 if (pr->pr_root->v_mount == mp) { 3404 /* 3405 * Clear current buffer data, so we are sure nothing from 3406 * the valid path left there. 3407 */ 3408 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3409 *sp->f_mntonname = '/'; 3410 return; 3411 } 3412 /* 3413 * If jail's chroot directory is set to "/" we should be able to see 3414 * all mount-points from inside a jail. 3415 */ 3416 if (strcmp(pr->pr_path, "/") == 0) 3417 return; 3418 len = strlen(pr->pr_path); 3419 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3420 /* 3421 * Clear current buffer data, so we are sure nothing from 3422 * the valid path left there. 3423 */ 3424 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3425 if (*jpath == '\0') { 3426 /* Should never happen. */ 3427 *sp->f_mntonname = '/'; 3428 } else { 3429 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3430 } 3431 } 3432 3433 /* 3434 * Check with permission for a specific privilege is granted within jail. We 3435 * have a specific list of accepted privileges; the rest are denied. 3436 */ 3437 int 3438 prison_priv_check(struct ucred *cred, int priv) 3439 { 3440 3441 if (!jailed(cred)) 3442 return (0); 3443 3444 #ifdef VIMAGE 3445 /* 3446 * Privileges specific to prisons with a virtual network stack. 3447 * There might be a duplicate entry here in case the privilege 3448 * is only granted conditionally in the legacy jail case. 3449 */ 3450 switch (priv) { 3451 #ifdef notyet 3452 /* 3453 * NFS-specific privileges. 3454 */ 3455 case PRIV_NFS_DAEMON: 3456 case PRIV_NFS_LOCKD: 3457 #endif 3458 /* 3459 * Network stack privileges. 3460 */ 3461 case PRIV_NET_BRIDGE: 3462 case PRIV_NET_GRE: 3463 case PRIV_NET_BPF: 3464 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3465 case PRIV_NET_ROUTE: 3466 case PRIV_NET_TAP: 3467 case PRIV_NET_SETIFMTU: 3468 case PRIV_NET_SETIFFLAGS: 3469 case PRIV_NET_SETIFCAP: 3470 case PRIV_NET_SETIFNAME : 3471 case PRIV_NET_SETIFMETRIC: 3472 case PRIV_NET_SETIFPHYS: 3473 case PRIV_NET_SETIFMAC: 3474 case PRIV_NET_ADDMULTI: 3475 case PRIV_NET_DELMULTI: 3476 case PRIV_NET_HWIOCTL: 3477 case PRIV_NET_SETLLADDR: 3478 case PRIV_NET_ADDIFGROUP: 3479 case PRIV_NET_DELIFGROUP: 3480 case PRIV_NET_IFCREATE: 3481 case PRIV_NET_IFDESTROY: 3482 case PRIV_NET_ADDIFADDR: 3483 case PRIV_NET_DELIFADDR: 3484 case PRIV_NET_LAGG: 3485 case PRIV_NET_GIF: 3486 case PRIV_NET_SETIFVNET: 3487 3488 /* 3489 * 802.11-related privileges. 3490 */ 3491 case PRIV_NET80211_GETKEY: 3492 #ifdef notyet 3493 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3494 #endif 3495 3496 #ifdef notyet 3497 /* 3498 * AppleTalk privileges. 3499 */ 3500 case PRIV_NETATALK_RESERVEDPORT: 3501 3502 /* 3503 * ATM privileges. 3504 */ 3505 case PRIV_NETATM_CFG: 3506 case PRIV_NETATM_ADD: 3507 case PRIV_NETATM_DEL: 3508 case PRIV_NETATM_SET: 3509 3510 /* 3511 * Bluetooth privileges. 3512 */ 3513 case PRIV_NETBLUETOOTH_RAW: 3514 #endif 3515 3516 /* 3517 * Netgraph and netgraph module privileges. 3518 */ 3519 case PRIV_NETGRAPH_CONTROL: 3520 #ifdef notyet 3521 case PRIV_NETGRAPH_TTY: 3522 #endif 3523 3524 /* 3525 * IPv4 and IPv6 privileges. 3526 */ 3527 case PRIV_NETINET_IPFW: 3528 case PRIV_NETINET_DIVERT: 3529 case PRIV_NETINET_PF: 3530 case PRIV_NETINET_DUMMYNET: 3531 case PRIV_NETINET_CARP: 3532 case PRIV_NETINET_MROUTE: 3533 case PRIV_NETINET_RAW: 3534 case PRIV_NETINET_ADDRCTRL6: 3535 case PRIV_NETINET_ND6: 3536 case PRIV_NETINET_SCOPE6: 3537 case PRIV_NETINET_ALIFETIME6: 3538 case PRIV_NETINET_IPSEC: 3539 case PRIV_NETINET_BINDANY: 3540 3541 #ifdef notyet 3542 /* 3543 * IPX/SPX privileges. 3544 */ 3545 case PRIV_NETIPX_RESERVEDPORT: 3546 case PRIV_NETIPX_RAW: 3547 3548 /* 3549 * NCP privileges. 3550 */ 3551 case PRIV_NETNCP: 3552 3553 /* 3554 * SMB privileges. 3555 */ 3556 case PRIV_NETSMB: 3557 #endif 3558 3559 /* 3560 * No default: or deny here. 3561 * In case of no permit fall through to next switch(). 3562 */ 3563 if (cred->cr_prison->pr_flags & PR_VNET) 3564 return (0); 3565 } 3566 #endif /* VIMAGE */ 3567 3568 switch (priv) { 3569 3570 /* 3571 * Allow ktrace privileges for root in jail. 3572 */ 3573 case PRIV_KTRACE: 3574 3575 #if 0 3576 /* 3577 * Allow jailed processes to configure audit identity and 3578 * submit audit records (login, etc). In the future we may 3579 * want to further refine the relationship between audit and 3580 * jail. 3581 */ 3582 case PRIV_AUDIT_GETAUDIT: 3583 case PRIV_AUDIT_SETAUDIT: 3584 case PRIV_AUDIT_SUBMIT: 3585 #endif 3586 3587 /* 3588 * Allow jailed processes to manipulate process UNIX 3589 * credentials in any way they see fit. 3590 */ 3591 case PRIV_CRED_SETUID: 3592 case PRIV_CRED_SETEUID: 3593 case PRIV_CRED_SETGID: 3594 case PRIV_CRED_SETEGID: 3595 case PRIV_CRED_SETGROUPS: 3596 case PRIV_CRED_SETREUID: 3597 case PRIV_CRED_SETREGID: 3598 case PRIV_CRED_SETRESUID: 3599 case PRIV_CRED_SETRESGID: 3600 3601 /* 3602 * Jail implements visibility constraints already, so allow 3603 * jailed root to override uid/gid-based constraints. 3604 */ 3605 case PRIV_SEEOTHERGIDS: 3606 case PRIV_SEEOTHERUIDS: 3607 3608 /* 3609 * Jail implements inter-process debugging limits already, so 3610 * allow jailed root various debugging privileges. 3611 */ 3612 case PRIV_DEBUG_DIFFCRED: 3613 case PRIV_DEBUG_SUGID: 3614 case PRIV_DEBUG_UNPRIV: 3615 3616 /* 3617 * Allow jail to set various resource limits and login 3618 * properties, and for now, exceed process resource limits. 3619 */ 3620 case PRIV_PROC_LIMIT: 3621 case PRIV_PROC_SETLOGIN: 3622 case PRIV_PROC_SETRLIMIT: 3623 3624 /* 3625 * System V and POSIX IPC privileges are granted in jail. 3626 */ 3627 case PRIV_IPC_READ: 3628 case PRIV_IPC_WRITE: 3629 case PRIV_IPC_ADMIN: 3630 case PRIV_IPC_MSGSIZE: 3631 case PRIV_MQ_ADMIN: 3632 3633 /* 3634 * Jail operations within a jail work on child jails. 3635 */ 3636 case PRIV_JAIL_ATTACH: 3637 case PRIV_JAIL_SET: 3638 case PRIV_JAIL_REMOVE: 3639 3640 /* 3641 * Jail implements its own inter-process limits, so allow 3642 * root processes in jail to change scheduling on other 3643 * processes in the same jail. Likewise for signalling. 3644 */ 3645 case PRIV_SCHED_DIFFCRED: 3646 case PRIV_SCHED_CPUSET: 3647 case PRIV_SIGNAL_DIFFCRED: 3648 case PRIV_SIGNAL_SUGID: 3649 3650 /* 3651 * Allow jailed processes to write to sysctls marked as jail 3652 * writable. 3653 */ 3654 case PRIV_SYSCTL_WRITEJAIL: 3655 3656 /* 3657 * Allow root in jail to manage a variety of quota 3658 * properties. These should likely be conditional on a 3659 * configuration option. 3660 */ 3661 case PRIV_VFS_GETQUOTA: 3662 case PRIV_VFS_SETQUOTA: 3663 3664 /* 3665 * Since Jail relies on chroot() to implement file system 3666 * protections, grant many VFS privileges to root in jail. 3667 * Be careful to exclude mount-related and NFS-related 3668 * privileges. 3669 */ 3670 case PRIV_VFS_READ: 3671 case PRIV_VFS_WRITE: 3672 case PRIV_VFS_ADMIN: 3673 case PRIV_VFS_EXEC: 3674 case PRIV_VFS_LOOKUP: 3675 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3676 case PRIV_VFS_CHFLAGS_DEV: 3677 case PRIV_VFS_CHOWN: 3678 case PRIV_VFS_CHROOT: 3679 case PRIV_VFS_RETAINSUGID: 3680 case PRIV_VFS_FCHROOT: 3681 case PRIV_VFS_LINK: 3682 case PRIV_VFS_SETGID: 3683 case PRIV_VFS_STAT: 3684 case PRIV_VFS_STICKYFILE: 3685 return (0); 3686 3687 /* 3688 * Depending on the global setting, allow privilege of 3689 * setting system flags. 3690 */ 3691 case PRIV_VFS_SYSFLAGS: 3692 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3693 return (0); 3694 else 3695 return (EPERM); 3696 3697 /* 3698 * Depending on the global setting, allow privilege of 3699 * mounting/unmounting file systems. 3700 */ 3701 case PRIV_VFS_MOUNT: 3702 case PRIV_VFS_UNMOUNT: 3703 case PRIV_VFS_MOUNT_NONUSER: 3704 case PRIV_VFS_MOUNT_OWNER: 3705 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT) 3706 return (0); 3707 else 3708 return (EPERM); 3709 3710 /* 3711 * Allow jailed root to bind reserved ports and reuse in-use 3712 * ports. 3713 */ 3714 case PRIV_NETINET_RESERVEDPORT: 3715 case PRIV_NETINET_REUSEPORT: 3716 return (0); 3717 3718 /* 3719 * Allow jailed root to set certian IPv4/6 (option) headers. 3720 */ 3721 case PRIV_NETINET_SETHDROPTS: 3722 return (0); 3723 3724 /* 3725 * Conditionally allow creating raw sockets in jail. 3726 */ 3727 case PRIV_NETINET_RAW: 3728 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3729 return (0); 3730 else 3731 return (EPERM); 3732 3733 /* 3734 * Since jail implements its own visibility limits on netstat 3735 * sysctls, allow getcred. This allows identd to work in 3736 * jail. 3737 */ 3738 case PRIV_NETINET_GETCRED: 3739 return (0); 3740 3741 default: 3742 /* 3743 * In all remaining cases, deny the privilege request. This 3744 * includes almost all network privileges, many system 3745 * configuration privileges. 3746 */ 3747 return (EPERM); 3748 } 3749 } 3750 3751 /* 3752 * Return the part of pr2's name that is relative to pr1, or the whole name 3753 * if it does not directly follow. 3754 */ 3755 3756 char * 3757 prison_name(struct prison *pr1, struct prison *pr2) 3758 { 3759 char *name; 3760 3761 /* Jails see themselves as "" (if they see themselves at all). */ 3762 if (pr1 == pr2) 3763 return ""; 3764 name = pr2->pr_name; 3765 if (prison_ischild(pr1, pr2)) { 3766 /* 3767 * pr1 isn't locked (and allprison_lock may not be either) 3768 * so its length can't be counted on. But the number of dots 3769 * can be counted on - and counted. 3770 */ 3771 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3772 name = strchr(name, '.') + 1; 3773 } 3774 return (name); 3775 } 3776 3777 /* 3778 * Return the part of pr2's path that is relative to pr1, or the whole path 3779 * if it does not directly follow. 3780 */ 3781 static char * 3782 prison_path(struct prison *pr1, struct prison *pr2) 3783 { 3784 char *path1, *path2; 3785 int len1; 3786 3787 path1 = pr1->pr_path; 3788 path2 = pr2->pr_path; 3789 if (!strcmp(path1, "/")) 3790 return (path2); 3791 len1 = strlen(path1); 3792 if (strncmp(path1, path2, len1)) 3793 return (path2); 3794 if (path2[len1] == '\0') 3795 return "/"; 3796 if (path2[len1] == '/') 3797 return (path2 + len1); 3798 return (path2); 3799 } 3800 3801 3802 /* 3803 * Jail-related sysctls. 3804 */ 3805 SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 3806 "Jails"); 3807 3808 static int 3809 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3810 { 3811 struct xprison *xp; 3812 struct prison *pr, *cpr; 3813 #ifdef INET 3814 struct in_addr *ip4 = NULL; 3815 int ip4s = 0; 3816 #endif 3817 #ifdef INET6 3818 struct in_addr *ip6 = NULL; 3819 int ip6s = 0; 3820 #endif 3821 int descend, error; 3822 3823 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3824 pr = req->td->td_ucred->cr_prison; 3825 error = 0; 3826 sx_slock(&allprison_lock); 3827 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3828 #if defined(INET) || defined(INET6) 3829 again: 3830 #endif 3831 mtx_lock(&cpr->pr_mtx); 3832 #ifdef INET 3833 if (cpr->pr_ip4s > 0) { 3834 if (ip4s < cpr->pr_ip4s) { 3835 ip4s = cpr->pr_ip4s; 3836 mtx_unlock(&cpr->pr_mtx); 3837 ip4 = realloc(ip4, ip4s * 3838 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3839 goto again; 3840 } 3841 bcopy(cpr->pr_ip4, ip4, 3842 cpr->pr_ip4s * sizeof(struct in_addr)); 3843 } 3844 #endif 3845 #ifdef INET6 3846 if (cpr->pr_ip6s > 0) { 3847 if (ip6s < cpr->pr_ip6s) { 3848 ip6s = cpr->pr_ip6s; 3849 mtx_unlock(&cpr->pr_mtx); 3850 ip6 = realloc(ip6, ip6s * 3851 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 3852 goto again; 3853 } 3854 bcopy(cpr->pr_ip6, ip6, 3855 cpr->pr_ip6s * sizeof(struct in6_addr)); 3856 } 3857 #endif 3858 if (cpr->pr_ref == 0) { 3859 mtx_unlock(&cpr->pr_mtx); 3860 continue; 3861 } 3862 bzero(xp, sizeof(*xp)); 3863 xp->pr_version = XPRISON_VERSION; 3864 xp->pr_id = cpr->pr_id; 3865 xp->pr_state = cpr->pr_uref > 0 3866 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 3867 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 3868 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 3869 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 3870 #ifdef INET 3871 xp->pr_ip4s = cpr->pr_ip4s; 3872 #endif 3873 #ifdef INET6 3874 xp->pr_ip6s = cpr->pr_ip6s; 3875 #endif 3876 mtx_unlock(&cpr->pr_mtx); 3877 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 3878 if (error) 3879 break; 3880 #ifdef INET 3881 if (xp->pr_ip4s > 0) { 3882 error = SYSCTL_OUT(req, ip4, 3883 xp->pr_ip4s * sizeof(struct in_addr)); 3884 if (error) 3885 break; 3886 } 3887 #endif 3888 #ifdef INET6 3889 if (xp->pr_ip6s > 0) { 3890 error = SYSCTL_OUT(req, ip6, 3891 xp->pr_ip6s * sizeof(struct in6_addr)); 3892 if (error) 3893 break; 3894 } 3895 #endif 3896 } 3897 sx_sunlock(&allprison_lock); 3898 free(xp, M_TEMP); 3899 #ifdef INET 3900 free(ip4, M_TEMP); 3901 #endif 3902 #ifdef INET6 3903 free(ip6, M_TEMP); 3904 #endif 3905 return (error); 3906 } 3907 3908 SYSCTL_OID(_security_jail, OID_AUTO, list, 3909 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3910 sysctl_jail_list, "S", "List of active jails"); 3911 3912 static int 3913 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 3914 { 3915 int error, injail; 3916 3917 injail = jailed(req->td->td_ucred); 3918 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 3919 3920 return (error); 3921 } 3922 3923 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 3924 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3925 sysctl_jail_jailed, "I", "Process in jail?"); 3926 3927 #if defined(INET) || defined(INET6) 3928 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 3929 &jail_max_af_ips, 0, 3930 "Number of IP addresses a jail may have at most per address family"); 3931 #endif 3932 3933 /* 3934 * Default parameters for jail(2) compatability. For historical reasons, 3935 * the sysctl names have varying similarity to the parameter names. Prisons 3936 * just see their own parameters, and can't change them. 3937 */ 3938 static int 3939 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 3940 { 3941 struct prison *pr; 3942 int allow, error, i; 3943 3944 pr = req->td->td_ucred->cr_prison; 3945 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 3946 3947 /* Get the current flag value, and convert it to a boolean. */ 3948 i = (allow & arg2) ? 1 : 0; 3949 if (arg1 != NULL) 3950 i = !i; 3951 error = sysctl_handle_int(oidp, &i, 0, req); 3952 if (error || !req->newptr) 3953 return (error); 3954 i = i ? arg2 : 0; 3955 if (arg1 != NULL) 3956 i ^= arg2; 3957 /* 3958 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 3959 * for writing. 3960 */ 3961 mtx_lock(&prison0.pr_mtx); 3962 jail_default_allow = (jail_default_allow & ~arg2) | i; 3963 mtx_unlock(&prison0.pr_mtx); 3964 return (0); 3965 } 3966 3967 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 3968 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3969 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 3970 "Processes in jail can set their hostnames"); 3971 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 3972 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3973 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 3974 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 3975 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 3976 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3977 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 3978 "Processes in jail can use System V IPC primitives"); 3979 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 3980 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3981 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 3982 "Prison root can create raw sockets"); 3983 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 3984 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3985 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 3986 "Processes in jail can alter system file flags"); 3987 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 3988 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3989 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 3990 "Processes in jail can mount/unmount jail-friendly file systems"); 3991 3992 static int 3993 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 3994 { 3995 struct prison *pr; 3996 int level, error; 3997 3998 pr = req->td->td_ucred->cr_prison; 3999 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4000 error = sysctl_handle_int(oidp, &level, 0, req); 4001 if (error || !req->newptr) 4002 return (error); 4003 *(int *)arg1 = level; 4004 return (0); 4005 } 4006 4007 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4008 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4009 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4010 sysctl_jail_default_level, "I", 4011 "Processes in jail cannot see all mounted file systems"); 4012 4013 /* 4014 * Nodes to describe jail parameters. Maximum length of string parameters 4015 * is returned in the string itself, and the other parameters exist merely 4016 * to make themselves and their types known. 4017 */ 4018 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4019 "Jail parameters"); 4020 4021 int 4022 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4023 { 4024 int i; 4025 long l; 4026 size_t s; 4027 char numbuf[12]; 4028 4029 switch (oidp->oid_kind & CTLTYPE) 4030 { 4031 case CTLTYPE_LONG: 4032 case CTLTYPE_ULONG: 4033 l = 0; 4034 #ifdef SCTL_MASK32 4035 if (!(req->flags & SCTL_MASK32)) 4036 #endif 4037 return (SYSCTL_OUT(req, &l, sizeof(l))); 4038 case CTLTYPE_INT: 4039 case CTLTYPE_UINT: 4040 i = 0; 4041 return (SYSCTL_OUT(req, &i, sizeof(i))); 4042 case CTLTYPE_STRING: 4043 snprintf(numbuf, sizeof(numbuf), "%d", arg2); 4044 return 4045 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4046 case CTLTYPE_STRUCT: 4047 s = (size_t)arg2; 4048 return (SYSCTL_OUT(req, &s, sizeof(s))); 4049 } 4050 return (0); 4051 } 4052 4053 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4054 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4055 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4056 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4057 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4058 "I", "Jail secure level"); 4059 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4060 "I", "Jail cannot see all mounted file systems"); 4061 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4062 "B", "Jail persistence"); 4063 #ifdef VIMAGE 4064 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4065 "E,jailsys", "Virtual network stack"); 4066 #endif 4067 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4068 "B", "Jail is in the process of shutting down"); 4069 4070 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4071 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4072 "I", "Current number of child jails"); 4073 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4074 "I", "Maximum number of child jails"); 4075 4076 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4077 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4078 "Jail hostname"); 4079 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4080 "Jail NIS domainname"); 4081 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4082 "Jail host UUID"); 4083 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4084 "LU", "Jail host ID"); 4085 4086 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4087 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4088 4089 #ifdef INET 4090 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4091 "Jail IPv4 address virtualization"); 4092 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4093 "S,in_addr,a", "Jail IPv4 addresses"); 4094 #endif 4095 #ifdef INET6 4096 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4097 "Jail IPv6 address virtualization"); 4098 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4099 "S,in6_addr,a", "Jail IPv6 addresses"); 4100 #endif 4101 4102 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4103 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4104 "B", "Jail may set hostname"); 4105 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4106 "B", "Jail may use SYSV IPC"); 4107 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4108 "B", "Jail may create raw sockets"); 4109 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4110 "B", "Jail may alter system file flags"); 4111 SYSCTL_JAIL_PARAM(_allow, mount, CTLTYPE_INT | CTLFLAG_RW, 4112 "B", "Jail may mount/unmount jail-friendly file systems"); 4113 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4114 "B", "Jail may set file quotas"); 4115 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4116 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4117 4118 4119 #ifdef DDB 4120 4121 static void 4122 db_show_prison(struct prison *pr) 4123 { 4124 int fi; 4125 #if defined(INET) || defined(INET6) 4126 int ii; 4127 #endif 4128 unsigned jsf; 4129 #ifdef INET6 4130 char ip6buf[INET6_ADDRSTRLEN]; 4131 #endif 4132 4133 db_printf("prison %p:\n", pr); 4134 db_printf(" jid = %d\n", pr->pr_id); 4135 db_printf(" name = %s\n", pr->pr_name); 4136 db_printf(" parent = %p\n", pr->pr_parent); 4137 db_printf(" ref = %d\n", pr->pr_ref); 4138 db_printf(" uref = %d\n", pr->pr_uref); 4139 db_printf(" path = %s\n", pr->pr_path); 4140 db_printf(" cpuset = %d\n", pr->pr_cpuset 4141 ? pr->pr_cpuset->cs_id : -1); 4142 #ifdef VIMAGE 4143 db_printf(" vnet = %p\n", pr->pr_vnet); 4144 #endif 4145 db_printf(" root = %p\n", pr->pr_root); 4146 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4147 db_printf(" childcount = %d\n", pr->pr_childcount); 4148 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4149 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4150 db_printf(" flags = %x", pr->pr_flags); 4151 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4152 fi++) 4153 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4154 db_printf(" %s", pr_flag_names[fi]); 4155 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4156 fi++) { 4157 jsf = pr->pr_flags & 4158 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4159 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4160 pr_flag_jailsys[fi].disable && 4161 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4162 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4163 : "inherit"); 4164 } 4165 db_printf(" allow = %x", pr->pr_allow); 4166 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4167 fi++) 4168 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4169 db_printf(" %s", pr_allow_names[fi]); 4170 db_printf("\n"); 4171 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4172 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4173 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4174 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4175 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4176 #ifdef INET 4177 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4178 for (ii = 0; ii < pr->pr_ip4s; ii++) 4179 db_printf(" %s %s\n", 4180 ii == 0 ? "ip4 =" : " ", 4181 inet_ntoa(pr->pr_ip4[ii])); 4182 #endif 4183 #ifdef INET6 4184 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4185 for (ii = 0; ii < pr->pr_ip6s; ii++) 4186 db_printf(" %s %s\n", 4187 ii == 0 ? "ip6 =" : " ", 4188 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4189 #endif 4190 } 4191 4192 DB_SHOW_COMMAND(prison, db_show_prison_command) 4193 { 4194 struct prison *pr; 4195 4196 if (!have_addr) { 4197 /* 4198 * Show all prisons in the list, and prison0 which is not 4199 * listed. 4200 */ 4201 db_show_prison(&prison0); 4202 if (!db_pager_quit) { 4203 TAILQ_FOREACH(pr, &allprison, pr_list) { 4204 db_show_prison(pr); 4205 if (db_pager_quit) 4206 break; 4207 } 4208 } 4209 return; 4210 } 4211 4212 if (addr == 0) 4213 pr = &prison0; 4214 else { 4215 /* Look for a prison with the ID and with references. */ 4216 TAILQ_FOREACH(pr, &allprison, pr_list) 4217 if (pr->pr_id == addr && pr->pr_ref > 0) 4218 break; 4219 if (pr == NULL) 4220 /* Look again, without requiring a reference. */ 4221 TAILQ_FOREACH(pr, &allprison, pr_list) 4222 if (pr->pr_id == addr) 4223 break; 4224 if (pr == NULL) 4225 /* Assume address points to a valid prison. */ 4226 pr = (struct prison *)addr; 4227 } 4228 db_show_prison(pr); 4229 } 4230 4231 #endif /* DDB */
Cache object: 29c21d0317246fc2b917d34940d7ee9d
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