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/8.2/sys/kern/kern_jail.c 212510 2010-09-13 00:42:07Z 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 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 81 #ifdef INET 82 #ifdef INET6 83 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 84 #else 85 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 86 #endif 87 #else /* !INET */ 88 #ifdef INET6 89 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 90 #else 91 #define _PR_IP_SADDRSEL 0 92 #endif 93 #endif 94 95 /* prison0 describes what is "real" about the system. */ 96 struct prison prison0 = { 97 .pr_id = 0, 98 .pr_name = "", 99 .pr_ref = 1, 100 .pr_uref = 1, 101 .pr_path = "/", 102 .pr_securelevel = -1, 103 .pr_childmax = JAIL_MAX, 104 .pr_hostuuid = DEFAULT_HOSTUUID, 105 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 106 #ifdef VIMAGE 107 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 108 #else 109 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 110 #endif 111 .pr_allow = PR_ALLOW_ALL, 112 }; 113 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 114 115 /* allprison and lastprid are protected by allprison_lock. */ 116 struct sx allprison_lock; 117 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 118 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 119 int lastprid = 0; 120 121 static int do_jail_attach(struct thread *td, struct prison *pr); 122 static void prison_complete(void *context, int pending); 123 static void prison_deref(struct prison *pr, int flags); 124 static char *prison_path(struct prison *pr1, struct prison *pr2); 125 static void prison_remove_one(struct prison *pr); 126 #ifdef INET 127 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia); 128 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4); 129 #endif 130 #ifdef INET6 131 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6); 132 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6); 133 #endif 134 135 /* Flags for prison_deref */ 136 #define PD_DEREF 0x01 137 #define PD_DEUREF 0x02 138 #define PD_LOCKED 0x04 139 #define PD_LIST_SLOCKED 0x08 140 #define PD_LIST_XLOCKED 0x10 141 142 /* 143 * Parameter names corresponding to PR_* flag values 144 */ 145 static char *pr_flag_names[] = { 146 [0] = "persist", 147 #ifdef INET 148 [7] = "ip4.saddrsel", 149 #endif 150 #ifdef INET6 151 [8] = "ip6.saddrsel", 152 #endif 153 }; 154 155 static char *pr_flag_nonames[] = { 156 [0] = "nopersist", 157 #ifdef INET 158 [7] = "ip4.nosaddrsel", 159 #endif 160 #ifdef INET6 161 [8] = "ip6.nosaddrsel", 162 #endif 163 }; 164 165 struct jailsys_flags { 166 const char *name; 167 unsigned disable; 168 unsigned new; 169 } pr_flag_jailsys[] = { 170 { "host", 0, PR_HOST }, 171 #ifdef VIMAGE 172 { "vnet", 0, PR_VNET }, 173 #endif 174 #ifdef INET 175 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER }, 176 #endif 177 #ifdef INET6 178 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER }, 179 #endif 180 }; 181 182 static char *pr_allow_names[] = { 183 "allow.set_hostname", 184 "allow.sysvipc", 185 "allow.raw_sockets", 186 "allow.chflags", 187 "allow.mount", 188 "allow.quotas", 189 "allow.socket_af", 190 }; 191 192 static char *pr_allow_nonames[] = { 193 "allow.noset_hostname", 194 "allow.nosysvipc", 195 "allow.noraw_sockets", 196 "allow.nochflags", 197 "allow.nomount", 198 "allow.noquotas", 199 "allow.nosocket_af", 200 }; 201 202 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 203 #define JAIL_DEFAULT_ENFORCE_STATFS 2 204 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 205 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 206 #if defined(INET) || defined(INET6) 207 static unsigned jail_max_af_ips = 255; 208 #endif 209 210 #ifdef INET 211 static int 212 qcmp_v4(const void *ip1, const void *ip2) 213 { 214 in_addr_t iaa, iab; 215 216 /* 217 * We need to compare in HBO here to get the list sorted as expected 218 * by the result of the code. Sorting NBO addresses gives you 219 * interesting results. If you do not understand, do not try. 220 */ 221 iaa = ntohl(((const struct in_addr *)ip1)->s_addr); 222 iab = ntohl(((const struct in_addr *)ip2)->s_addr); 223 224 /* 225 * Do not simply return the difference of the two numbers, the int is 226 * not wide enough. 227 */ 228 if (iaa > iab) 229 return (1); 230 else if (iaa < iab) 231 return (-1); 232 else 233 return (0); 234 } 235 #endif 236 237 #ifdef INET6 238 static int 239 qcmp_v6(const void *ip1, const void *ip2) 240 { 241 const struct in6_addr *ia6a, *ia6b; 242 int i, rc; 243 244 ia6a = (const struct in6_addr *)ip1; 245 ia6b = (const struct in6_addr *)ip2; 246 247 rc = 0; 248 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 249 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 250 rc = 1; 251 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 252 rc = -1; 253 } 254 return (rc); 255 } 256 #endif 257 258 /* 259 * struct jail_args { 260 * struct jail *jail; 261 * }; 262 */ 263 int 264 jail(struct thread *td, struct jail_args *uap) 265 { 266 uint32_t version; 267 int error; 268 struct jail j; 269 270 error = copyin(uap->jail, &version, sizeof(uint32_t)); 271 if (error) 272 return (error); 273 274 switch (version) { 275 case 0: 276 { 277 struct jail_v0 j0; 278 279 /* FreeBSD single IPv4 jails. */ 280 bzero(&j, sizeof(struct jail)); 281 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 282 if (error) 283 return (error); 284 j.version = j0.version; 285 j.path = j0.path; 286 j.hostname = j0.hostname; 287 j.ip4s = j0.ip_number; 288 break; 289 } 290 291 case 1: 292 /* 293 * Version 1 was used by multi-IPv4 jail implementations 294 * that never made it into the official kernel. 295 */ 296 return (EINVAL); 297 298 case 2: /* JAIL_API_VERSION */ 299 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 300 error = copyin(uap->jail, &j, sizeof(struct jail)); 301 if (error) 302 return (error); 303 break; 304 305 default: 306 /* Sci-Fi jails are not supported, sorry. */ 307 return (EINVAL); 308 } 309 return (kern_jail(td, &j)); 310 } 311 312 int 313 kern_jail(struct thread *td, struct jail *j) 314 { 315 struct iovec optiov[2 * (4 316 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0]) 317 #ifdef INET 318 + 1 319 #endif 320 #ifdef INET6 321 + 1 322 #endif 323 )]; 324 struct uio opt; 325 char *u_path, *u_hostname, *u_name; 326 #ifdef INET 327 uint32_t ip4s; 328 struct in_addr *u_ip4; 329 #endif 330 #ifdef INET6 331 struct in6_addr *u_ip6; 332 #endif 333 size_t tmplen; 334 int error, enforce_statfs, fi; 335 336 bzero(&optiov, sizeof(optiov)); 337 opt.uio_iov = optiov; 338 opt.uio_iovcnt = 0; 339 opt.uio_offset = -1; 340 opt.uio_resid = -1; 341 opt.uio_segflg = UIO_SYSSPACE; 342 opt.uio_rw = UIO_READ; 343 opt.uio_td = td; 344 345 /* Set permissions for top-level jails from sysctls. */ 346 if (!jailed(td->td_ucred)) { 347 for (fi = 0; fi < sizeof(pr_allow_names) / 348 sizeof(pr_allow_names[0]); fi++) { 349 optiov[opt.uio_iovcnt].iov_base = 350 (jail_default_allow & (1 << fi)) 351 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 352 optiov[opt.uio_iovcnt].iov_len = 353 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 354 opt.uio_iovcnt += 2; 355 } 356 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 357 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 358 opt.uio_iovcnt++; 359 enforce_statfs = jail_default_enforce_statfs; 360 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 361 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 362 opt.uio_iovcnt++; 363 } 364 365 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 366 #ifdef INET 367 ip4s = (j->version == 0) ? 1 : j->ip4s; 368 if (ip4s > jail_max_af_ips) 369 return (EINVAL); 370 tmplen += ip4s * sizeof(struct in_addr); 371 #else 372 if (j->ip4s > 0) 373 return (EINVAL); 374 #endif 375 #ifdef INET6 376 if (j->ip6s > jail_max_af_ips) 377 return (EINVAL); 378 tmplen += j->ip6s * sizeof(struct in6_addr); 379 #else 380 if (j->ip6s > 0) 381 return (EINVAL); 382 #endif 383 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 384 u_hostname = u_path + MAXPATHLEN; 385 u_name = u_hostname + MAXHOSTNAMELEN; 386 #ifdef INET 387 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 388 #endif 389 #ifdef INET6 390 #ifdef INET 391 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 392 #else 393 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 394 #endif 395 #endif 396 optiov[opt.uio_iovcnt].iov_base = "path"; 397 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 398 opt.uio_iovcnt++; 399 optiov[opt.uio_iovcnt].iov_base = u_path; 400 error = copyinstr(j->path, u_path, MAXPATHLEN, 401 &optiov[opt.uio_iovcnt].iov_len); 402 if (error) { 403 free(u_path, M_TEMP); 404 return (error); 405 } 406 opt.uio_iovcnt++; 407 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 408 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 409 opt.uio_iovcnt++; 410 optiov[opt.uio_iovcnt].iov_base = u_hostname; 411 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 412 &optiov[opt.uio_iovcnt].iov_len); 413 if (error) { 414 free(u_path, M_TEMP); 415 return (error); 416 } 417 opt.uio_iovcnt++; 418 if (j->jailname != NULL) { 419 optiov[opt.uio_iovcnt].iov_base = "name"; 420 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 421 opt.uio_iovcnt++; 422 optiov[opt.uio_iovcnt].iov_base = u_name; 423 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 424 &optiov[opt.uio_iovcnt].iov_len); 425 if (error) { 426 free(u_path, M_TEMP); 427 return (error); 428 } 429 opt.uio_iovcnt++; 430 } 431 #ifdef INET 432 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 433 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 434 opt.uio_iovcnt++; 435 optiov[opt.uio_iovcnt].iov_base = u_ip4; 436 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 437 if (j->version == 0) 438 u_ip4->s_addr = j->ip4s; 439 else { 440 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 441 if (error) { 442 free(u_path, M_TEMP); 443 return (error); 444 } 445 } 446 opt.uio_iovcnt++; 447 #endif 448 #ifdef INET6 449 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 450 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 451 opt.uio_iovcnt++; 452 optiov[opt.uio_iovcnt].iov_base = u_ip6; 453 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 454 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 455 if (error) { 456 free(u_path, M_TEMP); 457 return (error); 458 } 459 opt.uio_iovcnt++; 460 #endif 461 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]), 462 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 463 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 464 free(u_path, M_TEMP); 465 return (error); 466 } 467 468 469 /* 470 * struct jail_set_args { 471 * struct iovec *iovp; 472 * unsigned int iovcnt; 473 * int flags; 474 * }; 475 */ 476 int 477 jail_set(struct thread *td, struct jail_set_args *uap) 478 { 479 struct uio *auio; 480 int error; 481 482 /* Check that we have an even number of iovecs. */ 483 if (uap->iovcnt & 1) 484 return (EINVAL); 485 486 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 487 if (error) 488 return (error); 489 error = kern_jail_set(td, auio, uap->flags); 490 free(auio, M_IOV); 491 return (error); 492 } 493 494 int 495 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 496 { 497 struct nameidata nd; 498 #ifdef INET 499 struct in_addr *ip4; 500 #endif 501 #ifdef INET6 502 struct in6_addr *ip6; 503 #endif 504 struct vfsopt *opt; 505 struct vfsoptlist *opts; 506 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 507 struct vnode *root; 508 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 509 #if defined(INET) || defined(INET6) 510 struct prison *tppr; 511 void *op; 512 #endif 513 unsigned long hid; 514 size_t namelen, onamelen; 515 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos; 516 int gotchildmax, gotenforce, gothid, gotslevel; 517 int fi, jid, jsys, len, level; 518 int childmax, slevel, vfslocked; 519 #if defined(INET) || defined(INET6) 520 int ii, ij; 521 #endif 522 #ifdef INET 523 int ip4s, redo_ip4; 524 #endif 525 #ifdef INET6 526 int ip6s, redo_ip6; 527 #endif 528 unsigned pr_flags, ch_flags; 529 unsigned pr_allow, ch_allow, tallow; 530 char numbuf[12]; 531 532 error = priv_check(td, PRIV_JAIL_SET); 533 if (!error && (flags & JAIL_ATTACH)) 534 error = priv_check(td, PRIV_JAIL_ATTACH); 535 if (error) 536 return (error); 537 mypr = ppr = td->td_ucred->cr_prison; 538 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 539 return (EPERM); 540 if (flags & ~JAIL_SET_MASK) 541 return (EINVAL); 542 543 /* 544 * Check all the parameters before committing to anything. Not all 545 * errors can be caught early, but we may as well try. Also, this 546 * takes care of some expensive stuff (path lookup) before getting 547 * the allprison lock. 548 * 549 * XXX Jails are not filesystems, and jail parameters are not mount 550 * options. But it makes more sense to re-use the vfsopt code 551 * than duplicate it under a different name. 552 */ 553 error = vfs_buildopts(optuio, &opts); 554 if (error) 555 return (error); 556 #ifdef INET 557 ip4 = NULL; 558 #endif 559 #ifdef INET6 560 ip6 = NULL; 561 #endif 562 563 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 564 if (error == ENOENT) 565 jid = 0; 566 else if (error != 0) 567 goto done_free; 568 569 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 570 if (error == ENOENT) 571 gotslevel = 0; 572 else if (error != 0) 573 goto done_free; 574 else 575 gotslevel = 1; 576 577 error = 578 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 579 if (error == ENOENT) 580 gotchildmax = 0; 581 else if (error != 0) 582 goto done_free; 583 else 584 gotchildmax = 1; 585 586 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 587 if (error == ENOENT) 588 gotenforce = 0; 589 else if (error != 0) 590 goto done_free; 591 else if (enforce < 0 || enforce > 2) { 592 error = EINVAL; 593 goto done_free; 594 } else 595 gotenforce = 1; 596 597 pr_flags = ch_flags = 0; 598 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 599 fi++) { 600 if (pr_flag_names[fi] == NULL) 601 continue; 602 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 603 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 604 } 605 ch_flags |= pr_flags; 606 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 607 fi++) { 608 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 609 sizeof(jsys)); 610 if (error == ENOENT) 611 continue; 612 if (error != 0) 613 goto done_free; 614 switch (jsys) { 615 case JAIL_SYS_DISABLE: 616 if (!pr_flag_jailsys[fi].disable) { 617 error = EINVAL; 618 goto done_free; 619 } 620 pr_flags |= pr_flag_jailsys[fi].disable; 621 break; 622 case JAIL_SYS_NEW: 623 pr_flags |= pr_flag_jailsys[fi].new; 624 break; 625 case JAIL_SYS_INHERIT: 626 break; 627 default: 628 error = EINVAL; 629 goto done_free; 630 } 631 ch_flags |= 632 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 633 } 634 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 635 && !(pr_flags & PR_PERSIST)) { 636 error = EINVAL; 637 vfs_opterror(opts, "new jail must persist or attach"); 638 goto done_errmsg; 639 } 640 #ifdef VIMAGE 641 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 642 error = EINVAL; 643 vfs_opterror(opts, "vnet cannot be changed after creation"); 644 goto done_errmsg; 645 } 646 #endif 647 #ifdef INET 648 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 649 error = EINVAL; 650 vfs_opterror(opts, "ip4 cannot be changed after creation"); 651 goto done_errmsg; 652 } 653 #endif 654 #ifdef INET6 655 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 656 error = EINVAL; 657 vfs_opterror(opts, "ip6 cannot be changed after creation"); 658 goto done_errmsg; 659 } 660 #endif 661 662 pr_allow = ch_allow = 0; 663 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 664 fi++) { 665 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 666 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 667 } 668 ch_allow |= pr_allow; 669 670 error = vfs_getopt(opts, "name", (void **)&name, &len); 671 if (error == ENOENT) 672 name = NULL; 673 else if (error != 0) 674 goto done_free; 675 else { 676 if (len == 0 || name[len - 1] != '\0') { 677 error = EINVAL; 678 goto done_free; 679 } 680 if (len > MAXHOSTNAMELEN) { 681 error = ENAMETOOLONG; 682 goto done_free; 683 } 684 } 685 686 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 687 if (error == ENOENT) 688 host = NULL; 689 else if (error != 0) 690 goto done_free; 691 else { 692 ch_flags |= PR_HOST; 693 pr_flags |= PR_HOST; 694 if (len == 0 || host[len - 1] != '\0') { 695 error = EINVAL; 696 goto done_free; 697 } 698 if (len > MAXHOSTNAMELEN) { 699 error = ENAMETOOLONG; 700 goto done_free; 701 } 702 } 703 704 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 705 if (error == ENOENT) 706 domain = NULL; 707 else if (error != 0) 708 goto done_free; 709 else { 710 ch_flags |= PR_HOST; 711 pr_flags |= PR_HOST; 712 if (len == 0 || domain[len - 1] != '\0') { 713 error = EINVAL; 714 goto done_free; 715 } 716 if (len > MAXHOSTNAMELEN) { 717 error = ENAMETOOLONG; 718 goto done_free; 719 } 720 } 721 722 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 723 if (error == ENOENT) 724 uuid = NULL; 725 else if (error != 0) 726 goto done_free; 727 else { 728 ch_flags |= PR_HOST; 729 pr_flags |= PR_HOST; 730 if (len == 0 || uuid[len - 1] != '\0') { 731 error = EINVAL; 732 goto done_free; 733 } 734 if (len > HOSTUUIDLEN) { 735 error = ENAMETOOLONG; 736 goto done_free; 737 } 738 } 739 740 #ifdef COMPAT_FREEBSD32 741 if (td->td_proc->p_sysent->sv_flags & SV_ILP32) { 742 uint32_t hid32; 743 744 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 745 hid = hid32; 746 } else 747 #endif 748 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 749 if (error == ENOENT) 750 gothid = 0; 751 else if (error != 0) 752 goto done_free; 753 else { 754 gothid = 1; 755 ch_flags |= PR_HOST; 756 pr_flags |= PR_HOST; 757 } 758 759 #ifdef INET 760 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 761 if (error == ENOENT) 762 ip4s = (pr_flags & PR_IP4_DISABLE) ? 0 : -1; 763 else if (error != 0) 764 goto done_free; 765 else if (ip4s & (sizeof(*ip4) - 1)) { 766 error = EINVAL; 767 goto done_free; 768 } else { 769 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE; 770 if (ip4s == 0) 771 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE; 772 else { 773 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER; 774 ip4s /= sizeof(*ip4); 775 if (ip4s > jail_max_af_ips) { 776 error = EINVAL; 777 vfs_opterror(opts, "too many IPv4 addresses"); 778 goto done_errmsg; 779 } 780 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 781 bcopy(op, ip4, ip4s * sizeof(*ip4)); 782 /* 783 * IP addresses are all sorted but ip[0] to preserve 784 * the primary IP address as given from userland. 785 * This special IP is used for unbound outgoing 786 * connections as well for "loopback" traffic in case 787 * source address selection cannot find any more fitting 788 * address to connect from. 789 */ 790 if (ip4s > 1) 791 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4); 792 /* 793 * Check for duplicate addresses and do some simple 794 * zero and broadcast checks. If users give other bogus 795 * addresses it is their problem. 796 * 797 * We do not have to care about byte order for these 798 * checks so we will do them in NBO. 799 */ 800 for (ii = 0; ii < ip4s; ii++) { 801 if (ip4[ii].s_addr == INADDR_ANY || 802 ip4[ii].s_addr == INADDR_BROADCAST) { 803 error = EINVAL; 804 goto done_free; 805 } 806 if ((ii+1) < ip4s && 807 (ip4[0].s_addr == ip4[ii+1].s_addr || 808 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 809 error = EINVAL; 810 goto done_free; 811 } 812 } 813 } 814 } 815 #endif 816 817 #ifdef INET6 818 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 819 if (error == ENOENT) 820 ip6s = (pr_flags & PR_IP6_DISABLE) ? 0 : -1; 821 else if (error != 0) 822 goto done_free; 823 else if (ip6s & (sizeof(*ip6) - 1)) { 824 error = EINVAL; 825 goto done_free; 826 } else { 827 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE; 828 if (ip6s == 0) 829 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE; 830 else { 831 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER; 832 ip6s /= sizeof(*ip6); 833 if (ip6s > jail_max_af_ips) { 834 error = EINVAL; 835 vfs_opterror(opts, "too many IPv6 addresses"); 836 goto done_errmsg; 837 } 838 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 839 bcopy(op, ip6, ip6s * sizeof(*ip6)); 840 if (ip6s > 1) 841 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6); 842 for (ii = 0; ii < ip6s; ii++) { 843 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 844 error = EINVAL; 845 goto done_free; 846 } 847 if ((ii+1) < ip6s && 848 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 849 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 850 { 851 error = EINVAL; 852 goto done_free; 853 } 854 } 855 } 856 } 857 #endif 858 859 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 860 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 861 error = EINVAL; 862 vfs_opterror(opts, 863 "vnet jails cannot have IP address restrictions"); 864 goto done_errmsg; 865 } 866 #endif 867 868 root = NULL; 869 error = vfs_getopt(opts, "path", (void **)&path, &len); 870 if (error == ENOENT) 871 path = NULL; 872 else if (error != 0) 873 goto done_free; 874 else { 875 if (flags & JAIL_UPDATE) { 876 error = EINVAL; 877 vfs_opterror(opts, 878 "path cannot be changed after creation"); 879 goto done_errmsg; 880 } 881 if (len == 0 || path[len - 1] != '\0') { 882 error = EINVAL; 883 goto done_free; 884 } 885 if (len < 2 || (len == 2 && path[0] == '/')) 886 path = NULL; 887 else { 888 /* Leave room for a real-root full pathname. */ 889 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 890 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 891 error = ENAMETOOLONG; 892 goto done_free; 893 } 894 NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW, UIO_SYSSPACE, 895 path, td); 896 error = namei(&nd); 897 if (error) 898 goto done_free; 899 vfslocked = NDHASGIANT(&nd); 900 root = nd.ni_vp; 901 NDFREE(&nd, NDF_ONLY_PNBUF); 902 if (root->v_type != VDIR) { 903 error = ENOTDIR; 904 vrele(root); 905 VFS_UNLOCK_GIANT(vfslocked); 906 goto done_free; 907 } 908 VFS_UNLOCK_GIANT(vfslocked); 909 } 910 } 911 912 /* 913 * Grab the allprison lock before letting modules check their 914 * parameters. Once we have it, do not let go so we'll have a 915 * consistent view of the OSD list. 916 */ 917 sx_xlock(&allprison_lock); 918 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts); 919 if (error) 920 goto done_unlock_list; 921 922 /* By now, all parameters should have been noted. */ 923 TAILQ_FOREACH(opt, opts, link) { 924 if (!opt->seen && strcmp(opt->name, "errmsg")) { 925 error = EINVAL; 926 vfs_opterror(opts, "unknown parameter: %s", opt->name); 927 goto done_unlock_list; 928 } 929 } 930 931 /* 932 * See if we are creating a new record or updating an existing one. 933 * This abuses the file error codes ENOENT and EEXIST. 934 */ 935 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 936 if (!cuflags) { 937 error = EINVAL; 938 vfs_opterror(opts, "no valid operation (create or update)"); 939 goto done_unlock_list; 940 } 941 pr = NULL; 942 namelc = NULL; 943 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 944 namelc = strrchr(name, '.'); 945 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 946 if (*p != '\0') 947 jid = 0; 948 } 949 if (jid != 0) { 950 /* 951 * See if a requested jid already exists. There is an 952 * information leak here if the jid exists but is not within 953 * the caller's jail hierarchy. Jail creators will get EEXIST 954 * even though they cannot see the jail, and CREATE | UPDATE 955 * will return ENOENT which is not normally a valid error. 956 */ 957 if (jid < 0) { 958 error = EINVAL; 959 vfs_opterror(opts, "negative jid"); 960 goto done_unlock_list; 961 } 962 pr = prison_find(jid); 963 if (pr != NULL) { 964 ppr = pr->pr_parent; 965 /* Create: jid must not exist. */ 966 if (cuflags == JAIL_CREATE) { 967 mtx_unlock(&pr->pr_mtx); 968 error = EEXIST; 969 vfs_opterror(opts, "jail %d already exists", 970 jid); 971 goto done_unlock_list; 972 } 973 if (!prison_ischild(mypr, pr)) { 974 mtx_unlock(&pr->pr_mtx); 975 pr = NULL; 976 } else if (pr->pr_uref == 0) { 977 if (!(flags & JAIL_DYING)) { 978 mtx_unlock(&pr->pr_mtx); 979 error = ENOENT; 980 vfs_opterror(opts, "jail %d is dying", 981 jid); 982 goto done_unlock_list; 983 } else if ((flags & JAIL_ATTACH) || 984 (pr_flags & PR_PERSIST)) { 985 /* 986 * A dying jail might be resurrected 987 * (via attach or persist), but first 988 * it must determine if another jail 989 * has claimed its name. Accomplish 990 * this by implicitly re-setting the 991 * name. 992 */ 993 if (name == NULL) 994 name = prison_name(mypr, pr); 995 } 996 } 997 } 998 if (pr == NULL) { 999 /* Update: jid must exist. */ 1000 if (cuflags == JAIL_UPDATE) { 1001 error = ENOENT; 1002 vfs_opterror(opts, "jail %d not found", jid); 1003 goto done_unlock_list; 1004 } 1005 } 1006 } 1007 /* 1008 * If the caller provided a name, look for a jail by that name. 1009 * This has different semantics for creates and updates keyed by jid 1010 * (where the name must not already exist in a different jail), 1011 * and updates keyed by the name itself (where the name must exist 1012 * because that is the jail being updated). 1013 */ 1014 if (name != NULL) { 1015 namelc = strrchr(name, '.'); 1016 if (namelc == NULL) 1017 namelc = name; 1018 else { 1019 /* 1020 * This is a hierarchical name. Split it into the 1021 * parent and child names, and make sure the parent 1022 * exists or matches an already found jail. 1023 */ 1024 *namelc = '\0'; 1025 if (pr != NULL) { 1026 if (strncmp(name, ppr->pr_name, namelc - name) 1027 || ppr->pr_name[namelc - name] != '\0') { 1028 mtx_unlock(&pr->pr_mtx); 1029 error = EINVAL; 1030 vfs_opterror(opts, 1031 "cannot change jail's parent"); 1032 goto done_unlock_list; 1033 } 1034 } else { 1035 ppr = prison_find_name(mypr, name); 1036 if (ppr == NULL) { 1037 error = ENOENT; 1038 vfs_opterror(opts, 1039 "jail \"%s\" not found", name); 1040 goto done_unlock_list; 1041 } 1042 mtx_unlock(&ppr->pr_mtx); 1043 } 1044 name = ++namelc; 1045 } 1046 if (name[0] != '\0') { 1047 namelen = 1048 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1049 name_again: 1050 deadpr = NULL; 1051 FOREACH_PRISON_CHILD(ppr, tpr) { 1052 if (tpr != pr && tpr->pr_ref > 0 && 1053 !strcmp(tpr->pr_name + namelen, name)) { 1054 if (pr == NULL && 1055 cuflags != JAIL_CREATE) { 1056 mtx_lock(&tpr->pr_mtx); 1057 if (tpr->pr_ref > 0) { 1058 /* 1059 * Use this jail 1060 * for updates. 1061 */ 1062 if (tpr->pr_uref > 0) { 1063 pr = tpr; 1064 break; 1065 } 1066 deadpr = tpr; 1067 } 1068 mtx_unlock(&tpr->pr_mtx); 1069 } else if (tpr->pr_uref > 0) { 1070 /* 1071 * Create, or update(jid): 1072 * name must not exist in an 1073 * active sibling jail. 1074 */ 1075 error = EEXIST; 1076 if (pr != NULL) 1077 mtx_unlock(&pr->pr_mtx); 1078 vfs_opterror(opts, 1079 "jail \"%s\" already exists", 1080 name); 1081 goto done_unlock_list; 1082 } 1083 } 1084 } 1085 /* If no active jail is found, use a dying one. */ 1086 if (deadpr != NULL && pr == NULL) { 1087 if (flags & JAIL_DYING) { 1088 mtx_lock(&deadpr->pr_mtx); 1089 if (deadpr->pr_ref == 0) { 1090 mtx_unlock(&deadpr->pr_mtx); 1091 goto name_again; 1092 } 1093 pr = deadpr; 1094 } else if (cuflags == JAIL_UPDATE) { 1095 error = ENOENT; 1096 vfs_opterror(opts, 1097 "jail \"%s\" is dying", name); 1098 goto done_unlock_list; 1099 } 1100 } 1101 /* Update: name must exist if no jid. */ 1102 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1103 error = ENOENT; 1104 vfs_opterror(opts, "jail \"%s\" not found", 1105 name); 1106 goto done_unlock_list; 1107 } 1108 } 1109 } 1110 /* Update: must provide a jid or name. */ 1111 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1112 error = ENOENT; 1113 vfs_opterror(opts, "update specified no jail"); 1114 goto done_unlock_list; 1115 } 1116 1117 /* If there's no prison to update, create a new one and link it in. */ 1118 if (pr == NULL) { 1119 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1120 if (tpr->pr_childcount >= tpr->pr_childmax) { 1121 error = EPERM; 1122 vfs_opterror(opts, "prison limit exceeded"); 1123 goto done_unlock_list; 1124 } 1125 created = 1; 1126 mtx_lock(&ppr->pr_mtx); 1127 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) { 1128 mtx_unlock(&ppr->pr_mtx); 1129 error = ENOENT; 1130 vfs_opterror(opts, "parent jail went away!"); 1131 goto done_unlock_list; 1132 } 1133 ppr->pr_ref++; 1134 ppr->pr_uref++; 1135 mtx_unlock(&ppr->pr_mtx); 1136 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1137 if (jid == 0) { 1138 /* Find the next free jid. */ 1139 jid = lastprid + 1; 1140 findnext: 1141 if (jid == JAIL_MAX) 1142 jid = 1; 1143 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1144 if (tpr->pr_id < jid) 1145 continue; 1146 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1147 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1148 break; 1149 } 1150 if (jid == lastprid) { 1151 error = EAGAIN; 1152 vfs_opterror(opts, 1153 "no available jail IDs"); 1154 free(pr, M_PRISON); 1155 prison_deref(ppr, PD_DEREF | 1156 PD_DEUREF | PD_LIST_XLOCKED); 1157 goto done_releroot; 1158 } 1159 jid++; 1160 goto findnext; 1161 } 1162 lastprid = jid; 1163 } else { 1164 /* 1165 * The jail already has a jid (that did not yet exist), 1166 * so just find where to insert it. 1167 */ 1168 TAILQ_FOREACH(tpr, &allprison, pr_list) 1169 if (tpr->pr_id >= jid) { 1170 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1171 break; 1172 } 1173 } 1174 if (tpr == NULL) 1175 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1176 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1177 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1178 tpr->pr_childcount++; 1179 1180 pr->pr_parent = ppr; 1181 pr->pr_id = jid; 1182 1183 /* Set some default values, and inherit some from the parent. */ 1184 if (name == NULL) 1185 name = ""; 1186 if (path == NULL) { 1187 path = "/"; 1188 root = mypr->pr_root; 1189 vref(root); 1190 } 1191 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1192 pr->pr_flags |= PR_HOST; 1193 #if defined(INET) || defined(INET6) 1194 #ifdef VIMAGE 1195 if (!(pr_flags & PR_VNET)) 1196 #endif 1197 { 1198 #ifdef INET 1199 if (!(ch_flags & PR_IP4_USER)) 1200 pr->pr_flags |= 1201 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE; 1202 else if (!(pr_flags & PR_IP4_USER)) { 1203 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1204 if (ppr->pr_ip4 != NULL) { 1205 pr->pr_ip4s = ppr->pr_ip4s; 1206 pr->pr_ip4 = malloc(pr->pr_ip4s * 1207 sizeof(struct in_addr), M_PRISON, 1208 M_WAITOK); 1209 bcopy(ppr->pr_ip4, pr->pr_ip4, 1210 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1211 } 1212 } 1213 #endif 1214 #ifdef INET6 1215 if (!(ch_flags & PR_IP6_USER)) 1216 pr->pr_flags |= 1217 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE; 1218 else if (!(pr_flags & PR_IP6_USER)) { 1219 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1220 if (ppr->pr_ip6 != NULL) { 1221 pr->pr_ip6s = ppr->pr_ip6s; 1222 pr->pr_ip6 = malloc(pr->pr_ip6s * 1223 sizeof(struct in6_addr), M_PRISON, 1224 M_WAITOK); 1225 bcopy(ppr->pr_ip6, pr->pr_ip6, 1226 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1227 } 1228 } 1229 #endif 1230 } 1231 #endif 1232 /* Source address selection is always on by default. */ 1233 pr->pr_flags |= _PR_IP_SADDRSEL; 1234 1235 pr->pr_securelevel = ppr->pr_securelevel; 1236 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1237 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 1238 1239 LIST_INIT(&pr->pr_children); 1240 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1241 1242 #ifdef VIMAGE 1243 /* Allocate a new vnet if specified. */ 1244 pr->pr_vnet = (pr_flags & PR_VNET) 1245 ? vnet_alloc() : ppr->pr_vnet; 1246 #endif 1247 /* 1248 * Allocate a dedicated cpuset for each jail. 1249 * Unlike other initial settings, this may return an erorr. 1250 */ 1251 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1252 if (error) { 1253 prison_deref(pr, PD_LIST_XLOCKED); 1254 goto done_releroot; 1255 } 1256 1257 mtx_lock(&pr->pr_mtx); 1258 /* 1259 * New prisons do not yet have a reference, because we do not 1260 * want other to see the incomplete prison once the 1261 * allprison_lock is downgraded. 1262 */ 1263 } else { 1264 created = 0; 1265 /* 1266 * Grab a reference for existing prisons, to ensure they 1267 * continue to exist for the duration of the call. 1268 */ 1269 pr->pr_ref++; 1270 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1271 if ((pr->pr_flags & PR_VNET) && 1272 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1273 error = EINVAL; 1274 vfs_opterror(opts, 1275 "vnet jails cannot have IP address restrictions"); 1276 goto done_deref_locked; 1277 } 1278 #endif 1279 #ifdef INET 1280 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1281 error = EINVAL; 1282 vfs_opterror(opts, 1283 "ip4 cannot be changed after creation"); 1284 goto done_deref_locked; 1285 } 1286 #endif 1287 #ifdef INET6 1288 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1289 error = EINVAL; 1290 vfs_opterror(opts, 1291 "ip6 cannot be changed after creation"); 1292 goto done_deref_locked; 1293 } 1294 #endif 1295 } 1296 1297 /* Do final error checking before setting anything. */ 1298 if (gotslevel) { 1299 if (slevel < ppr->pr_securelevel) { 1300 error = EPERM; 1301 goto done_deref_locked; 1302 } 1303 } 1304 if (gotchildmax) { 1305 if (childmax >= ppr->pr_childmax) { 1306 error = EPERM; 1307 goto done_deref_locked; 1308 } 1309 } 1310 if (gotenforce) { 1311 if (enforce < ppr->pr_enforce_statfs) { 1312 error = EPERM; 1313 goto done_deref_locked; 1314 } 1315 } 1316 #ifdef INET 1317 if (ip4s > 0) { 1318 if (ppr->pr_flags & PR_IP4) { 1319 /* 1320 * Make sure the new set of IP addresses is a 1321 * subset of the parent's list. Don't worry 1322 * about the parent being unlocked, as any 1323 * setting is done with allprison_lock held. 1324 */ 1325 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1326 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1327 break; 1328 if (ij == ppr->pr_ip4s) { 1329 error = EPERM; 1330 goto done_deref_locked; 1331 } 1332 if (ip4s > 1) { 1333 for (ii = ij = 1; ii < ip4s; ii++) { 1334 if (ip4[ii].s_addr == 1335 ppr->pr_ip4[0].s_addr) 1336 continue; 1337 for (; ij < ppr->pr_ip4s; ij++) 1338 if (ip4[ii].s_addr == 1339 ppr->pr_ip4[ij].s_addr) 1340 break; 1341 if (ij == ppr->pr_ip4s) 1342 break; 1343 } 1344 if (ij == ppr->pr_ip4s) { 1345 error = EPERM; 1346 goto done_deref_locked; 1347 } 1348 } 1349 } 1350 /* 1351 * Check for conflicting IP addresses. We permit them 1352 * if there is no more than one IP on each jail. If 1353 * there is a duplicate on a jail with more than one 1354 * IP stop checking and return error. 1355 */ 1356 tppr = ppr; 1357 #ifdef VIMAGE 1358 for (; tppr != &prison0; tppr = tppr->pr_parent) 1359 if (tppr->pr_flags & PR_VNET) 1360 break; 1361 #endif 1362 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1363 if (tpr == pr || 1364 #ifdef VIMAGE 1365 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1366 #endif 1367 tpr->pr_uref == 0) { 1368 descend = 0; 1369 continue; 1370 } 1371 if (!(tpr->pr_flags & PR_IP4_USER)) 1372 continue; 1373 descend = 0; 1374 if (tpr->pr_ip4 == NULL || 1375 (ip4s == 1 && tpr->pr_ip4s == 1)) 1376 continue; 1377 for (ii = 0; ii < ip4s; ii++) { 1378 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1379 error = EADDRINUSE; 1380 vfs_opterror(opts, 1381 "IPv4 addresses clash"); 1382 goto done_deref_locked; 1383 } 1384 } 1385 } 1386 } 1387 #endif 1388 #ifdef INET6 1389 if (ip6s > 0) { 1390 if (ppr->pr_flags & PR_IP6) { 1391 /* 1392 * Make sure the new set of IP addresses is a 1393 * subset of the parent's list. 1394 */ 1395 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1396 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1397 &ppr->pr_ip6[ij])) 1398 break; 1399 if (ij == ppr->pr_ip6s) { 1400 error = EPERM; 1401 goto done_deref_locked; 1402 } 1403 if (ip6s > 1) { 1404 for (ii = ij = 1; ii < ip6s; ii++) { 1405 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1406 &ppr->pr_ip6[0])) 1407 continue; 1408 for (; ij < ppr->pr_ip6s; ij++) 1409 if (IN6_ARE_ADDR_EQUAL( 1410 &ip6[ii], &ppr->pr_ip6[ij])) 1411 break; 1412 if (ij == ppr->pr_ip6s) 1413 break; 1414 } 1415 if (ij == ppr->pr_ip6s) { 1416 error = EPERM; 1417 goto done_deref_locked; 1418 } 1419 } 1420 } 1421 /* Check for conflicting IP addresses. */ 1422 tppr = ppr; 1423 #ifdef VIMAGE 1424 for (; tppr != &prison0; tppr = tppr->pr_parent) 1425 if (tppr->pr_flags & PR_VNET) 1426 break; 1427 #endif 1428 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1429 if (tpr == pr || 1430 #ifdef VIMAGE 1431 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1432 #endif 1433 tpr->pr_uref == 0) { 1434 descend = 0; 1435 continue; 1436 } 1437 if (!(tpr->pr_flags & PR_IP6_USER)) 1438 continue; 1439 descend = 0; 1440 if (tpr->pr_ip6 == NULL || 1441 (ip6s == 1 && tpr->pr_ip6s == 1)) 1442 continue; 1443 for (ii = 0; ii < ip6s; ii++) { 1444 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1445 error = EADDRINUSE; 1446 vfs_opterror(opts, 1447 "IPv6 addresses clash"); 1448 goto done_deref_locked; 1449 } 1450 } 1451 } 1452 } 1453 #endif 1454 onamelen = namelen = 0; 1455 if (name != NULL) { 1456 /* Give a default name of the jid. */ 1457 if (name[0] == '\0') 1458 snprintf(name = numbuf, sizeof(numbuf), "%d", jid); 1459 else if (*namelc == '' || (strtoul(namelc, &p, 10) != jid && 1460 *p == '\0')) { 1461 error = EINVAL; 1462 vfs_opterror(opts, 1463 "name cannot be numeric (unless it is the jid)"); 1464 goto done_deref_locked; 1465 } 1466 /* 1467 * Make sure the name isn't too long for the prison or its 1468 * children. 1469 */ 1470 onamelen = strlen(pr->pr_name); 1471 namelen = strlen(name); 1472 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) { 1473 error = ENAMETOOLONG; 1474 goto done_deref_locked; 1475 } 1476 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1477 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1478 sizeof(pr->pr_name)) { 1479 error = ENAMETOOLONG; 1480 goto done_deref_locked; 1481 } 1482 } 1483 } 1484 if (pr_allow & ~ppr->pr_allow) { 1485 error = EPERM; 1486 goto done_deref_locked; 1487 } 1488 1489 /* Set the parameters of the prison. */ 1490 #ifdef INET 1491 redo_ip4 = 0; 1492 if (pr_flags & PR_IP4_USER) { 1493 pr->pr_flags |= PR_IP4; 1494 free(pr->pr_ip4, M_PRISON); 1495 pr->pr_ip4s = ip4s; 1496 pr->pr_ip4 = ip4; 1497 ip4 = NULL; 1498 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1499 #ifdef VIMAGE 1500 if (tpr->pr_flags & PR_VNET) { 1501 descend = 0; 1502 continue; 1503 } 1504 #endif 1505 if (prison_restrict_ip4(tpr, NULL)) { 1506 redo_ip4 = 1; 1507 descend = 0; 1508 } 1509 } 1510 } 1511 #endif 1512 #ifdef INET6 1513 redo_ip6 = 0; 1514 if (pr_flags & PR_IP6_USER) { 1515 pr->pr_flags |= PR_IP6; 1516 free(pr->pr_ip6, M_PRISON); 1517 pr->pr_ip6s = ip6s; 1518 pr->pr_ip6 = ip6; 1519 ip6 = NULL; 1520 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1521 #ifdef VIMAGE 1522 if (tpr->pr_flags & PR_VNET) { 1523 descend = 0; 1524 continue; 1525 } 1526 #endif 1527 if (prison_restrict_ip6(tpr, NULL)) { 1528 redo_ip6 = 1; 1529 descend = 0; 1530 } 1531 } 1532 } 1533 #endif 1534 if (gotslevel) { 1535 pr->pr_securelevel = slevel; 1536 /* Set all child jails to be at least this level. */ 1537 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1538 if (tpr->pr_securelevel < slevel) 1539 tpr->pr_securelevel = slevel; 1540 } 1541 if (gotchildmax) { 1542 pr->pr_childmax = childmax; 1543 /* Set all child jails to under this limit. */ 1544 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1545 if (tpr->pr_childmax > childmax - level) 1546 tpr->pr_childmax = childmax > level 1547 ? childmax - level : 0; 1548 } 1549 if (gotenforce) { 1550 pr->pr_enforce_statfs = enforce; 1551 /* Pass this restriction on to the children. */ 1552 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1553 if (tpr->pr_enforce_statfs < enforce) 1554 tpr->pr_enforce_statfs = enforce; 1555 } 1556 if (name != NULL) { 1557 if (ppr == &prison0) 1558 strlcpy(pr->pr_name, name, sizeof(pr->pr_name)); 1559 else 1560 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1561 ppr->pr_name, name); 1562 /* Change this component of child names. */ 1563 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1564 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1565 strlen(tpr->pr_name + onamelen) + 1); 1566 bcopy(pr->pr_name, tpr->pr_name, namelen); 1567 } 1568 } 1569 if (path != NULL) { 1570 /* Try to keep a real-rooted full pathname. */ 1571 if (path[0] == '/' && strcmp(mypr->pr_path, "/")) 1572 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1573 mypr->pr_path, path); 1574 else 1575 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1576 pr->pr_root = root; 1577 } 1578 if (PR_HOST & ch_flags & ~pr_flags) { 1579 if (pr->pr_flags & PR_HOST) { 1580 /* 1581 * Copy the parent's host info. As with pr_ip4 above, 1582 * the lack of a lock on the parent is not a problem; 1583 * it is always set with allprison_lock at least 1584 * shared, and is held exclusively here. 1585 */ 1586 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1587 sizeof(pr->pr_hostname)); 1588 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1589 sizeof(pr->pr_domainname)); 1590 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1591 sizeof(pr->pr_hostuuid)); 1592 pr->pr_hostid = pr->pr_parent->pr_hostid; 1593 } 1594 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1595 /* Set this prison, and any descendants without PR_HOST. */ 1596 if (host != NULL) 1597 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1598 if (domain != NULL) 1599 strlcpy(pr->pr_domainname, domain, 1600 sizeof(pr->pr_domainname)); 1601 if (uuid != NULL) 1602 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1603 if (gothid) 1604 pr->pr_hostid = hid; 1605 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1606 if (tpr->pr_flags & PR_HOST) 1607 descend = 0; 1608 else { 1609 if (host != NULL) 1610 strlcpy(tpr->pr_hostname, 1611 pr->pr_hostname, 1612 sizeof(tpr->pr_hostname)); 1613 if (domain != NULL) 1614 strlcpy(tpr->pr_domainname, 1615 pr->pr_domainname, 1616 sizeof(tpr->pr_domainname)); 1617 if (uuid != NULL) 1618 strlcpy(tpr->pr_hostuuid, 1619 pr->pr_hostuuid, 1620 sizeof(tpr->pr_hostuuid)); 1621 if (gothid) 1622 tpr->pr_hostid = hid; 1623 } 1624 } 1625 } 1626 if ((tallow = ch_allow & ~pr_allow)) { 1627 /* Clear allow bits in all children. */ 1628 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1629 tpr->pr_allow &= ~tallow; 1630 } 1631 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1632 /* 1633 * Persistent prisons get an extra reference, and prisons losing their 1634 * persist flag lose that reference. Only do this for existing prisons 1635 * for now, so new ones will remain unseen until after the module 1636 * handlers have completed. 1637 */ 1638 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1639 if (pr_flags & PR_PERSIST) { 1640 pr->pr_ref++; 1641 pr->pr_uref++; 1642 } else { 1643 pr->pr_ref--; 1644 pr->pr_uref--; 1645 } 1646 } 1647 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1648 mtx_unlock(&pr->pr_mtx); 1649 1650 /* Locks may have prevented a complete restriction of child IP 1651 * addresses. If so, allocate some more memory and try again. 1652 */ 1653 #ifdef INET 1654 while (redo_ip4) { 1655 ip4s = pr->pr_ip4s; 1656 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1657 mtx_lock(&pr->pr_mtx); 1658 redo_ip4 = 0; 1659 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1660 #ifdef VIMAGE 1661 if (tpr->pr_flags & PR_VNET) { 1662 descend = 0; 1663 continue; 1664 } 1665 #endif 1666 if (prison_restrict_ip4(tpr, ip4)) { 1667 if (ip4 != NULL) 1668 ip4 = NULL; 1669 else 1670 redo_ip4 = 1; 1671 } 1672 } 1673 mtx_unlock(&pr->pr_mtx); 1674 } 1675 #endif 1676 #ifdef INET6 1677 while (redo_ip6) { 1678 ip6s = pr->pr_ip6s; 1679 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1680 mtx_lock(&pr->pr_mtx); 1681 redo_ip6 = 0; 1682 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1683 #ifdef VIMAGE 1684 if (tpr->pr_flags & PR_VNET) { 1685 descend = 0; 1686 continue; 1687 } 1688 #endif 1689 if (prison_restrict_ip6(tpr, ip6)) { 1690 if (ip6 != NULL) 1691 ip6 = NULL; 1692 else 1693 redo_ip6 = 1; 1694 } 1695 } 1696 mtx_unlock(&pr->pr_mtx); 1697 } 1698 #endif 1699 1700 /* Let the modules do their work. */ 1701 sx_downgrade(&allprison_lock); 1702 if (created) { 1703 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1704 if (error) { 1705 prison_deref(pr, PD_LIST_SLOCKED); 1706 goto done_errmsg; 1707 } 1708 } 1709 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1710 if (error) { 1711 prison_deref(pr, created 1712 ? PD_LIST_SLOCKED 1713 : PD_DEREF | PD_LIST_SLOCKED); 1714 goto done_errmsg; 1715 } 1716 1717 /* Attach this process to the prison if requested. */ 1718 if (flags & JAIL_ATTACH) { 1719 mtx_lock(&pr->pr_mtx); 1720 error = do_jail_attach(td, pr); 1721 if (error) { 1722 vfs_opterror(opts, "attach failed"); 1723 if (!created) 1724 prison_deref(pr, PD_DEREF); 1725 goto done_errmsg; 1726 } 1727 } 1728 1729 /* 1730 * Now that it is all there, drop the temporary reference from existing 1731 * prisons. Or add a reference to newly created persistent prisons 1732 * (which was not done earlier so that the prison would not be publicly 1733 * visible). 1734 */ 1735 if (!created) { 1736 prison_deref(pr, (flags & JAIL_ATTACH) 1737 ? PD_DEREF 1738 : PD_DEREF | PD_LIST_SLOCKED); 1739 } else { 1740 if (pr_flags & PR_PERSIST) { 1741 mtx_lock(&pr->pr_mtx); 1742 pr->pr_ref++; 1743 pr->pr_uref++; 1744 mtx_unlock(&pr->pr_mtx); 1745 } 1746 if (!(flags & JAIL_ATTACH)) 1747 sx_sunlock(&allprison_lock); 1748 } 1749 td->td_retval[0] = pr->pr_id; 1750 goto done_errmsg; 1751 1752 done_deref_locked: 1753 prison_deref(pr, created 1754 ? PD_LOCKED | PD_LIST_XLOCKED 1755 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1756 goto done_releroot; 1757 done_unlock_list: 1758 sx_xunlock(&allprison_lock); 1759 done_releroot: 1760 if (root != NULL) { 1761 vfslocked = VFS_LOCK_GIANT(root->v_mount); 1762 vrele(root); 1763 VFS_UNLOCK_GIANT(vfslocked); 1764 } 1765 done_errmsg: 1766 if (error) { 1767 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1768 if (errmsg_len > 0) { 1769 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1770 if (errmsg_pos > 0) { 1771 if (optuio->uio_segflg == UIO_SYSSPACE) 1772 bcopy(errmsg, 1773 optuio->uio_iov[errmsg_pos].iov_base, 1774 errmsg_len); 1775 else 1776 copyout(errmsg, 1777 optuio->uio_iov[errmsg_pos].iov_base, 1778 errmsg_len); 1779 } 1780 } 1781 } 1782 done_free: 1783 #ifdef INET 1784 free(ip4, M_PRISON); 1785 #endif 1786 #ifdef INET6 1787 free(ip6, M_PRISON); 1788 #endif 1789 vfs_freeopts(opts); 1790 return (error); 1791 } 1792 1793 1794 /* 1795 * struct jail_get_args { 1796 * struct iovec *iovp; 1797 * unsigned int iovcnt; 1798 * int flags; 1799 * }; 1800 */ 1801 int 1802 jail_get(struct thread *td, struct jail_get_args *uap) 1803 { 1804 struct uio *auio; 1805 int error; 1806 1807 /* Check that we have an even number of iovecs. */ 1808 if (uap->iovcnt & 1) 1809 return (EINVAL); 1810 1811 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1812 if (error) 1813 return (error); 1814 error = kern_jail_get(td, auio, uap->flags); 1815 if (error == 0) 1816 error = copyout(auio->uio_iov, uap->iovp, 1817 uap->iovcnt * sizeof (struct iovec)); 1818 free(auio, M_IOV); 1819 return (error); 1820 } 1821 1822 int 1823 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1824 { 1825 struct prison *pr, *mypr; 1826 struct vfsopt *opt; 1827 struct vfsoptlist *opts; 1828 char *errmsg, *name; 1829 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1830 1831 if (flags & ~JAIL_GET_MASK) 1832 return (EINVAL); 1833 1834 /* Get the parameter list. */ 1835 error = vfs_buildopts(optuio, &opts); 1836 if (error) 1837 return (error); 1838 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1839 mypr = td->td_ucred->cr_prison; 1840 1841 /* 1842 * Find the prison specified by one of: lastjid, jid, name. 1843 */ 1844 sx_slock(&allprison_lock); 1845 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1846 if (error == 0) { 1847 TAILQ_FOREACH(pr, &allprison, pr_list) { 1848 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1849 mtx_lock(&pr->pr_mtx); 1850 if (pr->pr_ref > 0 && 1851 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1852 break; 1853 mtx_unlock(&pr->pr_mtx); 1854 } 1855 } 1856 if (pr != NULL) 1857 goto found_prison; 1858 error = ENOENT; 1859 vfs_opterror(opts, "no jail after %d", jid); 1860 goto done_unlock_list; 1861 } else if (error != ENOENT) 1862 goto done_unlock_list; 1863 1864 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1865 if (error == 0) { 1866 if (jid != 0) { 1867 pr = prison_find_child(mypr, jid); 1868 if (pr != NULL) { 1869 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1870 mtx_unlock(&pr->pr_mtx); 1871 error = ENOENT; 1872 vfs_opterror(opts, "jail %d is dying", 1873 jid); 1874 goto done_unlock_list; 1875 } 1876 goto found_prison; 1877 } 1878 error = ENOENT; 1879 vfs_opterror(opts, "jail %d not found", jid); 1880 goto done_unlock_list; 1881 } 1882 } else if (error != ENOENT) 1883 goto done_unlock_list; 1884 1885 error = vfs_getopt(opts, "name", (void **)&name, &len); 1886 if (error == 0) { 1887 if (len == 0 || name[len - 1] != '\0') { 1888 error = EINVAL; 1889 goto done_unlock_list; 1890 } 1891 pr = prison_find_name(mypr, name); 1892 if (pr != NULL) { 1893 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1894 mtx_unlock(&pr->pr_mtx); 1895 error = ENOENT; 1896 vfs_opterror(opts, "jail \"%s\" is dying", 1897 name); 1898 goto done_unlock_list; 1899 } 1900 goto found_prison; 1901 } 1902 error = ENOENT; 1903 vfs_opterror(opts, "jail \"%s\" not found", name); 1904 goto done_unlock_list; 1905 } else if (error != ENOENT) 1906 goto done_unlock_list; 1907 1908 vfs_opterror(opts, "no jail specified"); 1909 error = ENOENT; 1910 goto done_unlock_list; 1911 1912 found_prison: 1913 /* Get the parameters of the prison. */ 1914 pr->pr_ref++; 1915 locked = PD_LOCKED; 1916 td->td_retval[0] = pr->pr_id; 1917 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 1918 if (error != 0 && error != ENOENT) 1919 goto done_deref; 1920 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 1921 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 1922 if (error != 0 && error != ENOENT) 1923 goto done_deref; 1924 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 1925 if (error != 0 && error != ENOENT) 1926 goto done_deref; 1927 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 1928 sizeof(pr->pr_cpuset->cs_id)); 1929 if (error != 0 && error != ENOENT) 1930 goto done_deref; 1931 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 1932 if (error != 0 && error != ENOENT) 1933 goto done_deref; 1934 #ifdef INET 1935 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 1936 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1937 if (error != 0 && error != ENOENT) 1938 goto done_deref; 1939 #endif 1940 #ifdef INET6 1941 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 1942 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1943 if (error != 0 && error != ENOENT) 1944 goto done_deref; 1945 #endif 1946 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 1947 sizeof(pr->pr_securelevel)); 1948 if (error != 0 && error != ENOENT) 1949 goto done_deref; 1950 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 1951 sizeof(pr->pr_childcount)); 1952 if (error != 0 && error != ENOENT) 1953 goto done_deref; 1954 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 1955 sizeof(pr->pr_childmax)); 1956 if (error != 0 && error != ENOENT) 1957 goto done_deref; 1958 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 1959 if (error != 0 && error != ENOENT) 1960 goto done_deref; 1961 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 1962 if (error != 0 && error != ENOENT) 1963 goto done_deref; 1964 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 1965 if (error != 0 && error != ENOENT) 1966 goto done_deref; 1967 #ifdef COMPAT_FREEBSD32 1968 if (td->td_proc->p_sysent->sv_flags & SV_ILP32) { 1969 uint32_t hid32 = pr->pr_hostid; 1970 1971 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 1972 } else 1973 #endif 1974 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 1975 sizeof(pr->pr_hostid)); 1976 if (error != 0 && error != ENOENT) 1977 goto done_deref; 1978 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 1979 sizeof(pr->pr_enforce_statfs)); 1980 if (error != 0 && error != ENOENT) 1981 goto done_deref; 1982 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 1983 fi++) { 1984 if (pr_flag_names[fi] == NULL) 1985 continue; 1986 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 1987 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 1988 if (error != 0 && error != ENOENT) 1989 goto done_deref; 1990 i = !i; 1991 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 1992 if (error != 0 && error != ENOENT) 1993 goto done_deref; 1994 } 1995 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 1996 fi++) { 1997 i = pr->pr_flags & 1998 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 1999 i = pr_flag_jailsys[fi].disable && 2000 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2001 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2002 : JAIL_SYS_INHERIT; 2003 error = 2004 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2005 if (error != 0 && error != ENOENT) 2006 goto done_deref; 2007 } 2008 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 2009 fi++) { 2010 if (pr_allow_names[fi] == NULL) 2011 continue; 2012 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2013 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2014 if (error != 0 && error != ENOENT) 2015 goto done_deref; 2016 i = !i; 2017 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2018 if (error != 0 && error != ENOENT) 2019 goto done_deref; 2020 } 2021 i = (pr->pr_uref == 0); 2022 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2023 if (error != 0 && error != ENOENT) 2024 goto done_deref; 2025 i = !i; 2026 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2027 if (error != 0 && error != ENOENT) 2028 goto done_deref; 2029 2030 /* Get the module parameters. */ 2031 mtx_unlock(&pr->pr_mtx); 2032 locked = 0; 2033 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2034 if (error) 2035 goto done_deref; 2036 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2037 2038 /* By now, all parameters should have been noted. */ 2039 TAILQ_FOREACH(opt, opts, link) { 2040 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2041 error = EINVAL; 2042 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2043 goto done_errmsg; 2044 } 2045 } 2046 2047 /* Write the fetched parameters back to userspace. */ 2048 error = 0; 2049 TAILQ_FOREACH(opt, opts, link) { 2050 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2051 pos = 2 * opt->pos + 1; 2052 optuio->uio_iov[pos].iov_len = opt->len; 2053 if (opt->value != NULL) { 2054 if (optuio->uio_segflg == UIO_SYSSPACE) { 2055 bcopy(opt->value, 2056 optuio->uio_iov[pos].iov_base, 2057 opt->len); 2058 } else { 2059 error = copyout(opt->value, 2060 optuio->uio_iov[pos].iov_base, 2061 opt->len); 2062 if (error) 2063 break; 2064 } 2065 } 2066 } 2067 } 2068 goto done_errmsg; 2069 2070 done_deref: 2071 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2072 goto done_errmsg; 2073 2074 done_unlock_list: 2075 sx_sunlock(&allprison_lock); 2076 done_errmsg: 2077 if (error && errmsg_pos >= 0) { 2078 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2079 errmsg_pos = 2 * errmsg_pos + 1; 2080 if (errmsg_len > 0) { 2081 if (optuio->uio_segflg == UIO_SYSSPACE) 2082 bcopy(errmsg, 2083 optuio->uio_iov[errmsg_pos].iov_base, 2084 errmsg_len); 2085 else 2086 copyout(errmsg, 2087 optuio->uio_iov[errmsg_pos].iov_base, 2088 errmsg_len); 2089 } 2090 } 2091 vfs_freeopts(opts); 2092 return (error); 2093 } 2094 2095 2096 /* 2097 * struct jail_remove_args { 2098 * int jid; 2099 * }; 2100 */ 2101 int 2102 jail_remove(struct thread *td, struct jail_remove_args *uap) 2103 { 2104 struct prison *pr, *cpr, *lpr, *tpr; 2105 int descend, error; 2106 2107 error = priv_check(td, PRIV_JAIL_REMOVE); 2108 if (error) 2109 return (error); 2110 2111 sx_xlock(&allprison_lock); 2112 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2113 if (pr == NULL) { 2114 sx_xunlock(&allprison_lock); 2115 return (EINVAL); 2116 } 2117 2118 /* Remove all descendants of this prison, then remove this prison. */ 2119 pr->pr_ref++; 2120 pr->pr_flags |= PR_REMOVE; 2121 if (!LIST_EMPTY(&pr->pr_children)) { 2122 mtx_unlock(&pr->pr_mtx); 2123 lpr = NULL; 2124 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2125 mtx_lock(&cpr->pr_mtx); 2126 if (cpr->pr_ref > 0) { 2127 tpr = cpr; 2128 cpr->pr_ref++; 2129 cpr->pr_flags |= PR_REMOVE; 2130 } else { 2131 /* Already removed - do not do it again. */ 2132 tpr = NULL; 2133 } 2134 mtx_unlock(&cpr->pr_mtx); 2135 if (lpr != NULL) { 2136 mtx_lock(&lpr->pr_mtx); 2137 prison_remove_one(lpr); 2138 sx_xlock(&allprison_lock); 2139 } 2140 lpr = tpr; 2141 } 2142 if (lpr != NULL) { 2143 mtx_lock(&lpr->pr_mtx); 2144 prison_remove_one(lpr); 2145 sx_xlock(&allprison_lock); 2146 } 2147 mtx_lock(&pr->pr_mtx); 2148 } 2149 prison_remove_one(pr); 2150 return (0); 2151 } 2152 2153 static void 2154 prison_remove_one(struct prison *pr) 2155 { 2156 struct proc *p; 2157 int deuref; 2158 2159 /* If the prison was persistent, it is not anymore. */ 2160 deuref = 0; 2161 if (pr->pr_flags & PR_PERSIST) { 2162 pr->pr_ref--; 2163 deuref = PD_DEUREF; 2164 pr->pr_flags &= ~PR_PERSIST; 2165 } 2166 2167 /* 2168 * jail_remove added a reference. If that's the only one, remove 2169 * the prison now. 2170 */ 2171 KASSERT(pr->pr_ref > 0, 2172 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2173 if (pr->pr_ref == 1) { 2174 prison_deref(pr, 2175 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2176 return; 2177 } 2178 2179 mtx_unlock(&pr->pr_mtx); 2180 sx_xunlock(&allprison_lock); 2181 /* 2182 * Kill all processes unfortunate enough to be attached to this prison. 2183 */ 2184 sx_slock(&allproc_lock); 2185 LIST_FOREACH(p, &allproc, p_list) { 2186 PROC_LOCK(p); 2187 if (p->p_state != PRS_NEW && p->p_ucred && 2188 p->p_ucred->cr_prison == pr) 2189 psignal(p, SIGKILL); 2190 PROC_UNLOCK(p); 2191 } 2192 sx_sunlock(&allproc_lock); 2193 /* Remove the temporary reference added by jail_remove. */ 2194 prison_deref(pr, deuref | PD_DEREF); 2195 } 2196 2197 2198 /* 2199 * struct jail_attach_args { 2200 * int jid; 2201 * }; 2202 */ 2203 int 2204 jail_attach(struct thread *td, struct jail_attach_args *uap) 2205 { 2206 struct prison *pr; 2207 int error; 2208 2209 error = priv_check(td, PRIV_JAIL_ATTACH); 2210 if (error) 2211 return (error); 2212 2213 sx_slock(&allprison_lock); 2214 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2215 if (pr == NULL) { 2216 sx_sunlock(&allprison_lock); 2217 return (EINVAL); 2218 } 2219 2220 /* 2221 * Do not allow a process to attach to a prison that is not 2222 * considered to be "alive". 2223 */ 2224 if (pr->pr_uref == 0) { 2225 mtx_unlock(&pr->pr_mtx); 2226 sx_sunlock(&allprison_lock); 2227 return (EINVAL); 2228 } 2229 2230 return (do_jail_attach(td, pr)); 2231 } 2232 2233 static int 2234 do_jail_attach(struct thread *td, struct prison *pr) 2235 { 2236 struct prison *ppr; 2237 struct proc *p; 2238 struct ucred *newcred, *oldcred; 2239 int vfslocked, error; 2240 2241 /* 2242 * XXX: Note that there is a slight race here if two threads 2243 * in the same privileged process attempt to attach to two 2244 * different jails at the same time. It is important for 2245 * user processes not to do this, or they might end up with 2246 * a process root from one prison, but attached to the jail 2247 * of another. 2248 */ 2249 pr->pr_ref++; 2250 pr->pr_uref++; 2251 mtx_unlock(&pr->pr_mtx); 2252 2253 /* Let modules do whatever they need to prepare for attaching. */ 2254 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2255 if (error) { 2256 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2257 return (error); 2258 } 2259 sx_sunlock(&allprison_lock); 2260 2261 /* 2262 * Reparent the newly attached process to this jail. 2263 */ 2264 ppr = td->td_ucred->cr_prison; 2265 p = td->td_proc; 2266 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2267 if (error) 2268 goto e_revert_osd; 2269 2270 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount); 2271 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2272 if ((error = change_dir(pr->pr_root, td)) != 0) 2273 goto e_unlock; 2274 #ifdef MAC 2275 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2276 goto e_unlock; 2277 #endif 2278 VOP_UNLOCK(pr->pr_root, 0); 2279 if ((error = change_root(pr->pr_root, td))) 2280 goto e_unlock_giant; 2281 VFS_UNLOCK_GIANT(vfslocked); 2282 2283 newcred = crget(); 2284 PROC_LOCK(p); 2285 oldcred = p->p_ucred; 2286 setsugid(p); 2287 crcopy(newcred, oldcred); 2288 newcred->cr_prison = pr; 2289 p->p_ucred = newcred; 2290 PROC_UNLOCK(p); 2291 crfree(oldcred); 2292 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2293 return (0); 2294 e_unlock: 2295 VOP_UNLOCK(pr->pr_root, 0); 2296 e_unlock_giant: 2297 VFS_UNLOCK_GIANT(vfslocked); 2298 e_revert_osd: 2299 /* Tell modules this thread is still in its old jail after all. */ 2300 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2301 prison_deref(pr, PD_DEREF | PD_DEUREF); 2302 return (error); 2303 } 2304 2305 2306 /* 2307 * Returns a locked prison instance, or NULL on failure. 2308 */ 2309 struct prison * 2310 prison_find(int prid) 2311 { 2312 struct prison *pr; 2313 2314 sx_assert(&allprison_lock, SX_LOCKED); 2315 TAILQ_FOREACH(pr, &allprison, pr_list) { 2316 if (pr->pr_id == prid) { 2317 mtx_lock(&pr->pr_mtx); 2318 if (pr->pr_ref > 0) 2319 return (pr); 2320 mtx_unlock(&pr->pr_mtx); 2321 } 2322 } 2323 return (NULL); 2324 } 2325 2326 /* 2327 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2328 */ 2329 struct prison * 2330 prison_find_child(struct prison *mypr, int prid) 2331 { 2332 struct prison *pr; 2333 int descend; 2334 2335 sx_assert(&allprison_lock, SX_LOCKED); 2336 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2337 if (pr->pr_id == prid) { 2338 mtx_lock(&pr->pr_mtx); 2339 if (pr->pr_ref > 0) 2340 return (pr); 2341 mtx_unlock(&pr->pr_mtx); 2342 } 2343 } 2344 return (NULL); 2345 } 2346 2347 /* 2348 * Look for the name relative to mypr. Returns a locked prison or NULL. 2349 */ 2350 struct prison * 2351 prison_find_name(struct prison *mypr, const char *name) 2352 { 2353 struct prison *pr, *deadpr; 2354 size_t mylen; 2355 int descend; 2356 2357 sx_assert(&allprison_lock, SX_LOCKED); 2358 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2359 again: 2360 deadpr = NULL; 2361 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2362 if (!strcmp(pr->pr_name + mylen, name)) { 2363 mtx_lock(&pr->pr_mtx); 2364 if (pr->pr_ref > 0) { 2365 if (pr->pr_uref > 0) 2366 return (pr); 2367 deadpr = pr; 2368 } 2369 mtx_unlock(&pr->pr_mtx); 2370 } 2371 } 2372 /* There was no valid prison - perhaps there was a dying one. */ 2373 if (deadpr != NULL) { 2374 mtx_lock(&deadpr->pr_mtx); 2375 if (deadpr->pr_ref == 0) { 2376 mtx_unlock(&deadpr->pr_mtx); 2377 goto again; 2378 } 2379 } 2380 return (deadpr); 2381 } 2382 2383 /* 2384 * See if a prison has the specific flag set. 2385 */ 2386 int 2387 prison_flag(struct ucred *cred, unsigned flag) 2388 { 2389 2390 /* This is an atomic read, so no locking is necessary. */ 2391 return (cred->cr_prison->pr_flags & flag); 2392 } 2393 2394 int 2395 prison_allow(struct ucred *cred, unsigned flag) 2396 { 2397 2398 /* This is an atomic read, so no locking is necessary. */ 2399 return (cred->cr_prison->pr_allow & flag); 2400 } 2401 2402 /* 2403 * Remove a prison reference. If that was the last reference, remove the 2404 * prison itself - but not in this context in case there are locks held. 2405 */ 2406 void 2407 prison_free_locked(struct prison *pr) 2408 { 2409 2410 mtx_assert(&pr->pr_mtx, MA_OWNED); 2411 pr->pr_ref--; 2412 if (pr->pr_ref == 0) { 2413 mtx_unlock(&pr->pr_mtx); 2414 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2415 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2416 return; 2417 } 2418 mtx_unlock(&pr->pr_mtx); 2419 } 2420 2421 void 2422 prison_free(struct prison *pr) 2423 { 2424 2425 mtx_lock(&pr->pr_mtx); 2426 prison_free_locked(pr); 2427 } 2428 2429 static void 2430 prison_complete(void *context, int pending) 2431 { 2432 2433 prison_deref((struct prison *)context, 0); 2434 } 2435 2436 /* 2437 * Remove a prison reference (usually). This internal version assumes no 2438 * mutexes are held, except perhaps the prison itself. If there are no more 2439 * references, release and delist the prison. On completion, the prison lock 2440 * and the allprison lock are both unlocked. 2441 */ 2442 static void 2443 prison_deref(struct prison *pr, int flags) 2444 { 2445 struct prison *ppr, *tpr; 2446 int vfslocked; 2447 2448 if (!(flags & PD_LOCKED)) 2449 mtx_lock(&pr->pr_mtx); 2450 /* Decrement the user references in a separate loop. */ 2451 if (flags & PD_DEUREF) { 2452 for (tpr = pr;; tpr = tpr->pr_parent) { 2453 if (tpr != pr) 2454 mtx_lock(&tpr->pr_mtx); 2455 if (--tpr->pr_uref > 0) 2456 break; 2457 KASSERT(tpr != &prison0, ("prison0 pr_uref=0")); 2458 mtx_unlock(&tpr->pr_mtx); 2459 } 2460 /* Done if there were only user references to remove. */ 2461 if (!(flags & PD_DEREF)) { 2462 mtx_unlock(&tpr->pr_mtx); 2463 if (flags & PD_LIST_SLOCKED) 2464 sx_sunlock(&allprison_lock); 2465 else if (flags & PD_LIST_XLOCKED) 2466 sx_xunlock(&allprison_lock); 2467 return; 2468 } 2469 if (tpr != pr) { 2470 mtx_unlock(&tpr->pr_mtx); 2471 mtx_lock(&pr->pr_mtx); 2472 } 2473 } 2474 2475 for (;;) { 2476 if (flags & PD_DEREF) 2477 pr->pr_ref--; 2478 /* If the prison still has references, nothing else to do. */ 2479 if (pr->pr_ref > 0) { 2480 mtx_unlock(&pr->pr_mtx); 2481 if (flags & PD_LIST_SLOCKED) 2482 sx_sunlock(&allprison_lock); 2483 else if (flags & PD_LIST_XLOCKED) 2484 sx_xunlock(&allprison_lock); 2485 return; 2486 } 2487 2488 mtx_unlock(&pr->pr_mtx); 2489 if (flags & PD_LIST_SLOCKED) { 2490 if (!sx_try_upgrade(&allprison_lock)) { 2491 sx_sunlock(&allprison_lock); 2492 sx_xlock(&allprison_lock); 2493 } 2494 } else if (!(flags & PD_LIST_XLOCKED)) 2495 sx_xlock(&allprison_lock); 2496 2497 TAILQ_REMOVE(&allprison, pr, pr_list); 2498 LIST_REMOVE(pr, pr_sibling); 2499 ppr = pr->pr_parent; 2500 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2501 tpr->pr_childcount--; 2502 sx_xunlock(&allprison_lock); 2503 2504 #ifdef VIMAGE 2505 if (pr->pr_vnet != ppr->pr_vnet) 2506 vnet_destroy(pr->pr_vnet); 2507 #endif 2508 if (pr->pr_root != NULL) { 2509 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount); 2510 vrele(pr->pr_root); 2511 VFS_UNLOCK_GIANT(vfslocked); 2512 } 2513 mtx_destroy(&pr->pr_mtx); 2514 #ifdef INET 2515 free(pr->pr_ip4, M_PRISON); 2516 #endif 2517 #ifdef INET6 2518 free(pr->pr_ip6, M_PRISON); 2519 #endif 2520 if (pr->pr_cpuset != NULL) 2521 cpuset_rel(pr->pr_cpuset); 2522 osd_jail_exit(pr); 2523 free(pr, M_PRISON); 2524 2525 /* Removing a prison frees a reference on its parent. */ 2526 pr = ppr; 2527 mtx_lock(&pr->pr_mtx); 2528 flags = PD_DEREF; 2529 } 2530 } 2531 2532 void 2533 prison_hold_locked(struct prison *pr) 2534 { 2535 2536 mtx_assert(&pr->pr_mtx, MA_OWNED); 2537 KASSERT(pr->pr_ref > 0, 2538 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2539 pr->pr_ref++; 2540 } 2541 2542 void 2543 prison_hold(struct prison *pr) 2544 { 2545 2546 mtx_lock(&pr->pr_mtx); 2547 prison_hold_locked(pr); 2548 mtx_unlock(&pr->pr_mtx); 2549 } 2550 2551 void 2552 prison_proc_hold(struct prison *pr) 2553 { 2554 2555 mtx_lock(&pr->pr_mtx); 2556 KASSERT(pr->pr_uref > 0, 2557 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2558 pr->pr_uref++; 2559 mtx_unlock(&pr->pr_mtx); 2560 } 2561 2562 void 2563 prison_proc_free(struct prison *pr) 2564 { 2565 2566 mtx_lock(&pr->pr_mtx); 2567 KASSERT(pr->pr_uref > 0, 2568 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2569 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2570 } 2571 2572 2573 #ifdef INET 2574 /* 2575 * Restrict a prison's IP address list with its parent's, possibly replacing 2576 * it. Return true if the replacement buffer was used (or would have been). 2577 */ 2578 static int 2579 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2580 { 2581 int ii, ij, used; 2582 struct prison *ppr; 2583 2584 ppr = pr->pr_parent; 2585 if (!(pr->pr_flags & PR_IP4_USER)) { 2586 /* This has no user settings, so just copy the parent's list. */ 2587 if (pr->pr_ip4s < ppr->pr_ip4s) { 2588 /* 2589 * There's no room for the parent's list. Use the 2590 * new list buffer, which is assumed to be big enough 2591 * (if it was passed). If there's no buffer, try to 2592 * allocate one. 2593 */ 2594 used = 1; 2595 if (newip4 == NULL) { 2596 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2597 M_PRISON, M_NOWAIT); 2598 if (newip4 != NULL) 2599 used = 0; 2600 } 2601 if (newip4 != NULL) { 2602 bcopy(ppr->pr_ip4, newip4, 2603 ppr->pr_ip4s * sizeof(*newip4)); 2604 free(pr->pr_ip4, M_PRISON); 2605 pr->pr_ip4 = newip4; 2606 pr->pr_ip4s = ppr->pr_ip4s; 2607 } 2608 return (used); 2609 } 2610 pr->pr_ip4s = ppr->pr_ip4s; 2611 if (pr->pr_ip4s > 0) 2612 bcopy(ppr->pr_ip4, pr->pr_ip4, 2613 pr->pr_ip4s * sizeof(*newip4)); 2614 else if (pr->pr_ip4 != NULL) { 2615 free(pr->pr_ip4, M_PRISON); 2616 pr->pr_ip4 = NULL; 2617 } 2618 } else if (pr->pr_ip4s > 0) { 2619 /* Remove addresses that aren't in the parent. */ 2620 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2621 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2622 break; 2623 if (ij < ppr->pr_ip4s) 2624 ii = 1; 2625 else { 2626 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2627 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2628 ii = 0; 2629 } 2630 for (ij = 1; ii < pr->pr_ip4s; ) { 2631 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2632 ii++; 2633 continue; 2634 } 2635 switch (ij >= ppr->pr_ip4s ? -1 : 2636 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2637 case -1: 2638 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2639 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2640 break; 2641 case 0: 2642 ii++; 2643 ij++; 2644 break; 2645 case 1: 2646 ij++; 2647 break; 2648 } 2649 } 2650 if (pr->pr_ip4s == 0) { 2651 pr->pr_flags |= PR_IP4_DISABLE; 2652 free(pr->pr_ip4, M_PRISON); 2653 pr->pr_ip4 = NULL; 2654 } 2655 } 2656 return (0); 2657 } 2658 2659 /* 2660 * Pass back primary IPv4 address of this jail. 2661 * 2662 * If not restricted return success but do not alter the address. Caller has 2663 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2664 * 2665 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2666 * Address returned in NBO. 2667 */ 2668 int 2669 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2670 { 2671 struct prison *pr; 2672 2673 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2674 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2675 2676 pr = cred->cr_prison; 2677 if (!(pr->pr_flags & PR_IP4)) 2678 return (0); 2679 mtx_lock(&pr->pr_mtx); 2680 if (!(pr->pr_flags & PR_IP4)) { 2681 mtx_unlock(&pr->pr_mtx); 2682 return (0); 2683 } 2684 if (pr->pr_ip4 == NULL) { 2685 mtx_unlock(&pr->pr_mtx); 2686 return (EAFNOSUPPORT); 2687 } 2688 2689 ia->s_addr = pr->pr_ip4[0].s_addr; 2690 mtx_unlock(&pr->pr_mtx); 2691 return (0); 2692 } 2693 2694 /* 2695 * Return 1 if we should do proper source address selection or are not jailed. 2696 * We will return 0 if we should bypass source address selection in favour 2697 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2698 * returned in NBO. 2699 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2700 */ 2701 int 2702 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2703 { 2704 struct prison *pr; 2705 struct in_addr lia; 2706 int error; 2707 2708 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2709 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2710 2711 if (!jailed(cred)) 2712 return (1); 2713 2714 pr = cred->cr_prison; 2715 if (pr->pr_flags & PR_IP4_SADDRSEL) 2716 return (1); 2717 2718 lia.s_addr = INADDR_ANY; 2719 error = prison_get_ip4(cred, &lia); 2720 if (error) 2721 return (error); 2722 if (lia.s_addr == INADDR_ANY) 2723 return (1); 2724 2725 ia->s_addr = lia.s_addr; 2726 return (0); 2727 } 2728 2729 /* 2730 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2731 */ 2732 int 2733 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2734 { 2735 2736 if (pr1 == pr2) 2737 return (1); 2738 2739 /* 2740 * No need to lock since the PR_IP4_USER flag can't be altered for 2741 * existing prisons. 2742 */ 2743 while (pr1 != &prison0 && 2744 #ifdef VIMAGE 2745 !(pr1->pr_flags & PR_VNET) && 2746 #endif 2747 !(pr1->pr_flags & PR_IP4_USER)) 2748 pr1 = pr1->pr_parent; 2749 while (pr2 != &prison0 && 2750 #ifdef VIMAGE 2751 !(pr2->pr_flags & PR_VNET) && 2752 #endif 2753 !(pr2->pr_flags & PR_IP4_USER)) 2754 pr2 = pr2->pr_parent; 2755 return (pr1 == pr2); 2756 } 2757 2758 /* 2759 * Make sure our (source) address is set to something meaningful to this 2760 * jail. 2761 * 2762 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2763 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2764 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2765 */ 2766 int 2767 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2768 { 2769 struct prison *pr; 2770 struct in_addr ia0; 2771 int error; 2772 2773 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2774 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2775 2776 pr = cred->cr_prison; 2777 if (!(pr->pr_flags & PR_IP4)) 2778 return (0); 2779 mtx_lock(&pr->pr_mtx); 2780 if (!(pr->pr_flags & PR_IP4)) { 2781 mtx_unlock(&pr->pr_mtx); 2782 return (0); 2783 } 2784 if (pr->pr_ip4 == NULL) { 2785 mtx_unlock(&pr->pr_mtx); 2786 return (EAFNOSUPPORT); 2787 } 2788 2789 ia0.s_addr = ntohl(ia->s_addr); 2790 if (ia0.s_addr == INADDR_LOOPBACK) { 2791 ia->s_addr = pr->pr_ip4[0].s_addr; 2792 mtx_unlock(&pr->pr_mtx); 2793 return (0); 2794 } 2795 2796 if (ia0.s_addr == INADDR_ANY) { 2797 /* 2798 * In case there is only 1 IPv4 address, bind directly. 2799 */ 2800 if (pr->pr_ip4s == 1) 2801 ia->s_addr = pr->pr_ip4[0].s_addr; 2802 mtx_unlock(&pr->pr_mtx); 2803 return (0); 2804 } 2805 2806 error = _prison_check_ip4(pr, ia); 2807 mtx_unlock(&pr->pr_mtx); 2808 return (error); 2809 } 2810 2811 /* 2812 * Rewrite destination address in case we will connect to loopback address. 2813 * 2814 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2815 * Address passed in in NBO and returned in NBO. 2816 */ 2817 int 2818 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2819 { 2820 struct prison *pr; 2821 2822 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2823 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2824 2825 pr = cred->cr_prison; 2826 if (!(pr->pr_flags & PR_IP4)) 2827 return (0); 2828 mtx_lock(&pr->pr_mtx); 2829 if (!(pr->pr_flags & PR_IP4)) { 2830 mtx_unlock(&pr->pr_mtx); 2831 return (0); 2832 } 2833 if (pr->pr_ip4 == NULL) { 2834 mtx_unlock(&pr->pr_mtx); 2835 return (EAFNOSUPPORT); 2836 } 2837 2838 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2839 ia->s_addr = pr->pr_ip4[0].s_addr; 2840 mtx_unlock(&pr->pr_mtx); 2841 return (0); 2842 } 2843 2844 /* 2845 * Return success because nothing had to be changed. 2846 */ 2847 mtx_unlock(&pr->pr_mtx); 2848 return (0); 2849 } 2850 2851 /* 2852 * Check if given address belongs to the jail referenced by cred/prison. 2853 * 2854 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2855 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2856 * doesn't allow IPv4. Address passed in in NBO. 2857 */ 2858 static int 2859 _prison_check_ip4(struct prison *pr, struct in_addr *ia) 2860 { 2861 int i, a, z, d; 2862 2863 /* 2864 * Check the primary IP. 2865 */ 2866 if (pr->pr_ip4[0].s_addr == ia->s_addr) 2867 return (0); 2868 2869 /* 2870 * All the other IPs are sorted so we can do a binary search. 2871 */ 2872 a = 0; 2873 z = pr->pr_ip4s - 2; 2874 while (a <= z) { 2875 i = (a + z) / 2; 2876 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 2877 if (d > 0) 2878 z = i - 1; 2879 else if (d < 0) 2880 a = i + 1; 2881 else 2882 return (0); 2883 } 2884 2885 return (EADDRNOTAVAIL); 2886 } 2887 2888 int 2889 prison_check_ip4(struct ucred *cred, struct in_addr *ia) 2890 { 2891 struct prison *pr; 2892 int error; 2893 2894 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2895 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2896 2897 pr = cred->cr_prison; 2898 if (!(pr->pr_flags & PR_IP4)) 2899 return (0); 2900 mtx_lock(&pr->pr_mtx); 2901 if (!(pr->pr_flags & PR_IP4)) { 2902 mtx_unlock(&pr->pr_mtx); 2903 return (0); 2904 } 2905 if (pr->pr_ip4 == NULL) { 2906 mtx_unlock(&pr->pr_mtx); 2907 return (EAFNOSUPPORT); 2908 } 2909 2910 error = _prison_check_ip4(pr, ia); 2911 mtx_unlock(&pr->pr_mtx); 2912 return (error); 2913 } 2914 #endif 2915 2916 #ifdef INET6 2917 static int 2918 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 2919 { 2920 int ii, ij, used; 2921 struct prison *ppr; 2922 2923 ppr = pr->pr_parent; 2924 if (!(pr->pr_flags & PR_IP6_USER)) { 2925 /* This has no user settings, so just copy the parent's list. */ 2926 if (pr->pr_ip6s < ppr->pr_ip6s) { 2927 /* 2928 * There's no room for the parent's list. Use the 2929 * new list buffer, which is assumed to be big enough 2930 * (if it was passed). If there's no buffer, try to 2931 * allocate one. 2932 */ 2933 used = 1; 2934 if (newip6 == NULL) { 2935 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 2936 M_PRISON, M_NOWAIT); 2937 if (newip6 != NULL) 2938 used = 0; 2939 } 2940 if (newip6 != NULL) { 2941 bcopy(ppr->pr_ip6, newip6, 2942 ppr->pr_ip6s * sizeof(*newip6)); 2943 free(pr->pr_ip6, M_PRISON); 2944 pr->pr_ip6 = newip6; 2945 pr->pr_ip6s = ppr->pr_ip6s; 2946 } 2947 return (used); 2948 } 2949 pr->pr_ip6s = ppr->pr_ip6s; 2950 if (pr->pr_ip6s > 0) 2951 bcopy(ppr->pr_ip6, pr->pr_ip6, 2952 pr->pr_ip6s * sizeof(*newip6)); 2953 else if (pr->pr_ip6 != NULL) { 2954 free(pr->pr_ip6, M_PRISON); 2955 pr->pr_ip6 = NULL; 2956 } 2957 } else if (pr->pr_ip6s > 0) { 2958 /* Remove addresses that aren't in the parent. */ 2959 for (ij = 0; ij < ppr->pr_ip6s; ij++) 2960 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 2961 &ppr->pr_ip6[ij])) 2962 break; 2963 if (ij < ppr->pr_ip6s) 2964 ii = 1; 2965 else { 2966 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 2967 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2968 ii = 0; 2969 } 2970 for (ij = 1; ii < pr->pr_ip6s; ) { 2971 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 2972 &ppr->pr_ip6[0])) { 2973 ii++; 2974 continue; 2975 } 2976 switch (ij >= ppr->pr_ip4s ? -1 : 2977 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 2978 case -1: 2979 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 2980 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 2981 break; 2982 case 0: 2983 ii++; 2984 ij++; 2985 break; 2986 case 1: 2987 ij++; 2988 break; 2989 } 2990 } 2991 if (pr->pr_ip6s == 0) { 2992 pr->pr_flags |= PR_IP6_DISABLE; 2993 free(pr->pr_ip6, M_PRISON); 2994 pr->pr_ip6 = NULL; 2995 } 2996 } 2997 return 0; 2998 } 2999 3000 /* 3001 * Pass back primary IPv6 address for this jail. 3002 * 3003 * If not restricted return success but do not alter the address. Caller has 3004 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3005 * 3006 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3007 */ 3008 int 3009 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3010 { 3011 struct prison *pr; 3012 3013 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3014 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3015 3016 pr = cred->cr_prison; 3017 if (!(pr->pr_flags & PR_IP6)) 3018 return (0); 3019 mtx_lock(&pr->pr_mtx); 3020 if (!(pr->pr_flags & PR_IP6)) { 3021 mtx_unlock(&pr->pr_mtx); 3022 return (0); 3023 } 3024 if (pr->pr_ip6 == NULL) { 3025 mtx_unlock(&pr->pr_mtx); 3026 return (EAFNOSUPPORT); 3027 } 3028 3029 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3030 mtx_unlock(&pr->pr_mtx); 3031 return (0); 3032 } 3033 3034 /* 3035 * Return 1 if we should do proper source address selection or are not jailed. 3036 * We will return 0 if we should bypass source address selection in favour 3037 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3038 * returned in NBO. 3039 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3040 */ 3041 int 3042 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3043 { 3044 struct prison *pr; 3045 struct in6_addr lia6; 3046 int error; 3047 3048 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3049 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3050 3051 if (!jailed(cred)) 3052 return (1); 3053 3054 pr = cred->cr_prison; 3055 if (pr->pr_flags & PR_IP6_SADDRSEL) 3056 return (1); 3057 3058 lia6 = in6addr_any; 3059 error = prison_get_ip6(cred, &lia6); 3060 if (error) 3061 return (error); 3062 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3063 return (1); 3064 3065 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3066 return (0); 3067 } 3068 3069 /* 3070 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3071 */ 3072 int 3073 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3074 { 3075 3076 if (pr1 == pr2) 3077 return (1); 3078 3079 while (pr1 != &prison0 && 3080 #ifdef VIMAGE 3081 !(pr1->pr_flags & PR_VNET) && 3082 #endif 3083 !(pr1->pr_flags & PR_IP6_USER)) 3084 pr1 = pr1->pr_parent; 3085 while (pr2 != &prison0 && 3086 #ifdef VIMAGE 3087 !(pr2->pr_flags & PR_VNET) && 3088 #endif 3089 !(pr2->pr_flags & PR_IP6_USER)) 3090 pr2 = pr2->pr_parent; 3091 return (pr1 == pr2); 3092 } 3093 3094 /* 3095 * Make sure our (source) address is set to something meaningful to this jail. 3096 * 3097 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3098 * when needed while binding. 3099 * 3100 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3101 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3102 * doesn't allow IPv6. 3103 */ 3104 int 3105 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3106 { 3107 struct prison *pr; 3108 int error; 3109 3110 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3111 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3112 3113 pr = cred->cr_prison; 3114 if (!(pr->pr_flags & PR_IP6)) 3115 return (0); 3116 mtx_lock(&pr->pr_mtx); 3117 if (!(pr->pr_flags & PR_IP6)) { 3118 mtx_unlock(&pr->pr_mtx); 3119 return (0); 3120 } 3121 if (pr->pr_ip6 == NULL) { 3122 mtx_unlock(&pr->pr_mtx); 3123 return (EAFNOSUPPORT); 3124 } 3125 3126 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3127 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3128 mtx_unlock(&pr->pr_mtx); 3129 return (0); 3130 } 3131 3132 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3133 /* 3134 * In case there is only 1 IPv6 address, and v6only is true, 3135 * then bind directly. 3136 */ 3137 if (v6only != 0 && pr->pr_ip6s == 1) 3138 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3139 mtx_unlock(&pr->pr_mtx); 3140 return (0); 3141 } 3142 3143 error = _prison_check_ip6(pr, ia6); 3144 mtx_unlock(&pr->pr_mtx); 3145 return (error); 3146 } 3147 3148 /* 3149 * Rewrite destination address in case we will connect to loopback address. 3150 * 3151 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3152 */ 3153 int 3154 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3155 { 3156 struct prison *pr; 3157 3158 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3159 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3160 3161 pr = cred->cr_prison; 3162 if (!(pr->pr_flags & PR_IP6)) 3163 return (0); 3164 mtx_lock(&pr->pr_mtx); 3165 if (!(pr->pr_flags & PR_IP6)) { 3166 mtx_unlock(&pr->pr_mtx); 3167 return (0); 3168 } 3169 if (pr->pr_ip6 == NULL) { 3170 mtx_unlock(&pr->pr_mtx); 3171 return (EAFNOSUPPORT); 3172 } 3173 3174 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3175 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3176 mtx_unlock(&pr->pr_mtx); 3177 return (0); 3178 } 3179 3180 /* 3181 * Return success because nothing had to be changed. 3182 */ 3183 mtx_unlock(&pr->pr_mtx); 3184 return (0); 3185 } 3186 3187 /* 3188 * Check if given address belongs to the jail referenced by cred/prison. 3189 * 3190 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3191 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3192 * doesn't allow IPv6. 3193 */ 3194 static int 3195 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3196 { 3197 int i, a, z, d; 3198 3199 /* 3200 * Check the primary IP. 3201 */ 3202 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3203 return (0); 3204 3205 /* 3206 * All the other IPs are sorted so we can do a binary search. 3207 */ 3208 a = 0; 3209 z = pr->pr_ip6s - 2; 3210 while (a <= z) { 3211 i = (a + z) / 2; 3212 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3213 if (d > 0) 3214 z = i - 1; 3215 else if (d < 0) 3216 a = i + 1; 3217 else 3218 return (0); 3219 } 3220 3221 return (EADDRNOTAVAIL); 3222 } 3223 3224 int 3225 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3226 { 3227 struct prison *pr; 3228 int error; 3229 3230 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3231 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3232 3233 pr = cred->cr_prison; 3234 if (!(pr->pr_flags & PR_IP6)) 3235 return (0); 3236 mtx_lock(&pr->pr_mtx); 3237 if (!(pr->pr_flags & PR_IP6)) { 3238 mtx_unlock(&pr->pr_mtx); 3239 return (0); 3240 } 3241 if (pr->pr_ip6 == NULL) { 3242 mtx_unlock(&pr->pr_mtx); 3243 return (EAFNOSUPPORT); 3244 } 3245 3246 error = _prison_check_ip6(pr, ia6); 3247 mtx_unlock(&pr->pr_mtx); 3248 return (error); 3249 } 3250 #endif 3251 3252 /* 3253 * Check if a jail supports the given address family. 3254 * 3255 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3256 * if not. 3257 */ 3258 int 3259 prison_check_af(struct ucred *cred, int af) 3260 { 3261 struct prison *pr; 3262 int error; 3263 3264 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3265 3266 pr = cred->cr_prison; 3267 #ifdef VIMAGE 3268 /* Prisons with their own network stack are not limited. */ 3269 if (prison_owns_vnet(cred)) 3270 return (0); 3271 #endif 3272 3273 error = 0; 3274 switch (af) 3275 { 3276 #ifdef INET 3277 case AF_INET: 3278 if (pr->pr_flags & PR_IP4) 3279 { 3280 mtx_lock(&pr->pr_mtx); 3281 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3282 error = EAFNOSUPPORT; 3283 mtx_unlock(&pr->pr_mtx); 3284 } 3285 break; 3286 #endif 3287 #ifdef INET6 3288 case AF_INET6: 3289 if (pr->pr_flags & PR_IP6) 3290 { 3291 mtx_lock(&pr->pr_mtx); 3292 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3293 error = EAFNOSUPPORT; 3294 mtx_unlock(&pr->pr_mtx); 3295 } 3296 break; 3297 #endif 3298 case AF_LOCAL: 3299 case AF_ROUTE: 3300 break; 3301 default: 3302 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3303 error = EAFNOSUPPORT; 3304 } 3305 return (error); 3306 } 3307 3308 /* 3309 * Check if given address belongs to the jail referenced by cred (wrapper to 3310 * prison_check_ip[46]). 3311 * 3312 * Returns 0 if jail doesn't restrict the address family or if address belongs 3313 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3314 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3315 */ 3316 int 3317 prison_if(struct ucred *cred, struct sockaddr *sa) 3318 { 3319 #ifdef INET 3320 struct sockaddr_in *sai; 3321 #endif 3322 #ifdef INET6 3323 struct sockaddr_in6 *sai6; 3324 #endif 3325 int error; 3326 3327 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3328 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3329 3330 #ifdef VIMAGE 3331 if (prison_owns_vnet(cred)) 3332 return (0); 3333 #endif 3334 3335 error = 0; 3336 switch (sa->sa_family) 3337 { 3338 #ifdef INET 3339 case AF_INET: 3340 sai = (struct sockaddr_in *)sa; 3341 error = prison_check_ip4(cred, &sai->sin_addr); 3342 break; 3343 #endif 3344 #ifdef INET6 3345 case AF_INET6: 3346 sai6 = (struct sockaddr_in6 *)sa; 3347 error = prison_check_ip6(cred, &sai6->sin6_addr); 3348 break; 3349 #endif 3350 default: 3351 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3352 error = EAFNOSUPPORT; 3353 } 3354 return (error); 3355 } 3356 3357 /* 3358 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3359 */ 3360 int 3361 prison_check(struct ucred *cred1, struct ucred *cred2) 3362 { 3363 3364 return ((cred1->cr_prison == cred2->cr_prison || 3365 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3366 } 3367 3368 /* 3369 * Return 1 if p2 is a child of p1, otherwise 0. 3370 */ 3371 int 3372 prison_ischild(struct prison *pr1, struct prison *pr2) 3373 { 3374 3375 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3376 if (pr1 == pr2) 3377 return (1); 3378 return (0); 3379 } 3380 3381 /* 3382 * Return 1 if the passed credential is in a jail, otherwise 0. 3383 */ 3384 int 3385 jailed(struct ucred *cred) 3386 { 3387 3388 return (cred->cr_prison != &prison0); 3389 } 3390 3391 /* 3392 * Return 1 if the passed credential is in a jail and that jail does not 3393 * have its own virtual network stack, otherwise 0. 3394 */ 3395 int 3396 jailed_without_vnet(struct ucred *cred) 3397 { 3398 3399 if (!jailed(cred)) 3400 return (0); 3401 #ifdef VIMAGE 3402 if (prison_owns_vnet(cred)) 3403 return (0); 3404 #endif 3405 3406 return (1); 3407 } 3408 3409 /* 3410 * Return the correct hostname (domainname, et al) for the passed credential. 3411 */ 3412 void 3413 getcredhostname(struct ucred *cred, char *buf, size_t size) 3414 { 3415 struct prison *pr; 3416 3417 /* 3418 * A NULL credential can be used to shortcut to the physical 3419 * system's hostname. 3420 */ 3421 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3422 mtx_lock(&pr->pr_mtx); 3423 strlcpy(buf, pr->pr_hostname, size); 3424 mtx_unlock(&pr->pr_mtx); 3425 } 3426 3427 void 3428 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3429 { 3430 3431 mtx_lock(&cred->cr_prison->pr_mtx); 3432 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3433 mtx_unlock(&cred->cr_prison->pr_mtx); 3434 } 3435 3436 void 3437 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3438 { 3439 3440 mtx_lock(&cred->cr_prison->pr_mtx); 3441 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3442 mtx_unlock(&cred->cr_prison->pr_mtx); 3443 } 3444 3445 void 3446 getcredhostid(struct ucred *cred, unsigned long *hostid) 3447 { 3448 3449 mtx_lock(&cred->cr_prison->pr_mtx); 3450 *hostid = cred->cr_prison->pr_hostid; 3451 mtx_unlock(&cred->cr_prison->pr_mtx); 3452 } 3453 3454 #ifdef VIMAGE 3455 /* 3456 * Determine whether the prison represented by cred owns 3457 * its vnet rather than having it inherited. 3458 * 3459 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3460 */ 3461 int 3462 prison_owns_vnet(struct ucred *cred) 3463 { 3464 3465 /* 3466 * vnets cannot be added/removed after jail creation, 3467 * so no need to lock here. 3468 */ 3469 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3470 } 3471 #endif 3472 3473 /* 3474 * Determine whether the subject represented by cred can "see" 3475 * status of a mount point. 3476 * Returns: 0 for permitted, ENOENT otherwise. 3477 * XXX: This function should be called cr_canseemount() and should be 3478 * placed in kern_prot.c. 3479 */ 3480 int 3481 prison_canseemount(struct ucred *cred, struct mount *mp) 3482 { 3483 struct prison *pr; 3484 struct statfs *sp; 3485 size_t len; 3486 3487 pr = cred->cr_prison; 3488 if (pr->pr_enforce_statfs == 0) 3489 return (0); 3490 if (pr->pr_root->v_mount == mp) 3491 return (0); 3492 if (pr->pr_enforce_statfs == 2) 3493 return (ENOENT); 3494 /* 3495 * If jail's chroot directory is set to "/" we should be able to see 3496 * all mount-points from inside a jail. 3497 * This is ugly check, but this is the only situation when jail's 3498 * directory ends with '/'. 3499 */ 3500 if (strcmp(pr->pr_path, "/") == 0) 3501 return (0); 3502 len = strlen(pr->pr_path); 3503 sp = &mp->mnt_stat; 3504 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3505 return (ENOENT); 3506 /* 3507 * Be sure that we don't have situation where jail's root directory 3508 * is "/some/path" and mount point is "/some/pathpath". 3509 */ 3510 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3511 return (ENOENT); 3512 return (0); 3513 } 3514 3515 void 3516 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3517 { 3518 char jpath[MAXPATHLEN]; 3519 struct prison *pr; 3520 size_t len; 3521 3522 pr = cred->cr_prison; 3523 if (pr->pr_enforce_statfs == 0) 3524 return; 3525 if (prison_canseemount(cred, mp) != 0) { 3526 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3527 strlcpy(sp->f_mntonname, "[restricted]", 3528 sizeof(sp->f_mntonname)); 3529 return; 3530 } 3531 if (pr->pr_root->v_mount == mp) { 3532 /* 3533 * Clear current buffer data, so we are sure nothing from 3534 * the valid path left there. 3535 */ 3536 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3537 *sp->f_mntonname = '/'; 3538 return; 3539 } 3540 /* 3541 * If jail's chroot directory is set to "/" we should be able to see 3542 * all mount-points from inside a jail. 3543 */ 3544 if (strcmp(pr->pr_path, "/") == 0) 3545 return; 3546 len = strlen(pr->pr_path); 3547 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3548 /* 3549 * Clear current buffer data, so we are sure nothing from 3550 * the valid path left there. 3551 */ 3552 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3553 if (*jpath == '\0') { 3554 /* Should never happen. */ 3555 *sp->f_mntonname = '/'; 3556 } else { 3557 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3558 } 3559 } 3560 3561 /* 3562 * Check with permission for a specific privilege is granted within jail. We 3563 * have a specific list of accepted privileges; the rest are denied. 3564 */ 3565 int 3566 prison_priv_check(struct ucred *cred, int priv) 3567 { 3568 3569 if (!jailed(cred)) 3570 return (0); 3571 3572 #ifdef VIMAGE 3573 /* 3574 * Privileges specific to prisons with a virtual network stack. 3575 * There might be a duplicate entry here in case the privilege 3576 * is only granted conditionally in the legacy jail case. 3577 */ 3578 switch (priv) { 3579 #ifdef notyet 3580 /* 3581 * NFS-specific privileges. 3582 */ 3583 case PRIV_NFS_DAEMON: 3584 case PRIV_NFS_LOCKD: 3585 #endif 3586 /* 3587 * Network stack privileges. 3588 */ 3589 case PRIV_NET_BRIDGE: 3590 case PRIV_NET_GRE: 3591 case PRIV_NET_BPF: 3592 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3593 case PRIV_NET_ROUTE: 3594 case PRIV_NET_TAP: 3595 case PRIV_NET_SETIFMTU: 3596 case PRIV_NET_SETIFFLAGS: 3597 case PRIV_NET_SETIFCAP: 3598 case PRIV_NET_SETIFDESCR: 3599 case PRIV_NET_SETIFNAME : 3600 case PRIV_NET_SETIFMETRIC: 3601 case PRIV_NET_SETIFPHYS: 3602 case PRIV_NET_SETIFMAC: 3603 case PRIV_NET_ADDMULTI: 3604 case PRIV_NET_DELMULTI: 3605 case PRIV_NET_HWIOCTL: 3606 case PRIV_NET_SETLLADDR: 3607 case PRIV_NET_ADDIFGROUP: 3608 case PRIV_NET_DELIFGROUP: 3609 case PRIV_NET_IFCREATE: 3610 case PRIV_NET_IFDESTROY: 3611 case PRIV_NET_ADDIFADDR: 3612 case PRIV_NET_DELIFADDR: 3613 case PRIV_NET_LAGG: 3614 case PRIV_NET_GIF: 3615 case PRIV_NET_SETIFVNET: 3616 3617 /* 3618 * 802.11-related privileges. 3619 */ 3620 case PRIV_NET80211_GETKEY: 3621 #ifdef notyet 3622 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3623 #endif 3624 3625 #ifdef notyet 3626 /* 3627 * AppleTalk privileges. 3628 */ 3629 case PRIV_NETATALK_RESERVEDPORT: 3630 3631 /* 3632 * ATM privileges. 3633 */ 3634 case PRIV_NETATM_CFG: 3635 case PRIV_NETATM_ADD: 3636 case PRIV_NETATM_DEL: 3637 case PRIV_NETATM_SET: 3638 3639 /* 3640 * Bluetooth privileges. 3641 */ 3642 case PRIV_NETBLUETOOTH_RAW: 3643 #endif 3644 3645 /* 3646 * Netgraph and netgraph module privileges. 3647 */ 3648 case PRIV_NETGRAPH_CONTROL: 3649 #ifdef notyet 3650 case PRIV_NETGRAPH_TTY: 3651 #endif 3652 3653 /* 3654 * IPv4 and IPv6 privileges. 3655 */ 3656 case PRIV_NETINET_IPFW: 3657 case PRIV_NETINET_DIVERT: 3658 case PRIV_NETINET_PF: 3659 case PRIV_NETINET_DUMMYNET: 3660 case PRIV_NETINET_CARP: 3661 case PRIV_NETINET_MROUTE: 3662 case PRIV_NETINET_RAW: 3663 case PRIV_NETINET_ADDRCTRL6: 3664 case PRIV_NETINET_ND6: 3665 case PRIV_NETINET_SCOPE6: 3666 case PRIV_NETINET_ALIFETIME6: 3667 case PRIV_NETINET_IPSEC: 3668 case PRIV_NETINET_BINDANY: 3669 3670 #ifdef notyet 3671 /* 3672 * IPX/SPX privileges. 3673 */ 3674 case PRIV_NETIPX_RESERVEDPORT: 3675 case PRIV_NETIPX_RAW: 3676 3677 /* 3678 * NCP privileges. 3679 */ 3680 case PRIV_NETNCP: 3681 3682 /* 3683 * SMB privileges. 3684 */ 3685 case PRIV_NETSMB: 3686 #endif 3687 3688 /* 3689 * No default: or deny here. 3690 * In case of no permit fall through to next switch(). 3691 */ 3692 if (cred->cr_prison->pr_flags & PR_VNET) 3693 return (0); 3694 } 3695 #endif /* VIMAGE */ 3696 3697 switch (priv) { 3698 3699 /* 3700 * Allow ktrace privileges for root in jail. 3701 */ 3702 case PRIV_KTRACE: 3703 3704 #if 0 3705 /* 3706 * Allow jailed processes to configure audit identity and 3707 * submit audit records (login, etc). In the future we may 3708 * want to further refine the relationship between audit and 3709 * jail. 3710 */ 3711 case PRIV_AUDIT_GETAUDIT: 3712 case PRIV_AUDIT_SETAUDIT: 3713 case PRIV_AUDIT_SUBMIT: 3714 #endif 3715 3716 /* 3717 * Allow jailed processes to manipulate process UNIX 3718 * credentials in any way they see fit. 3719 */ 3720 case PRIV_CRED_SETUID: 3721 case PRIV_CRED_SETEUID: 3722 case PRIV_CRED_SETGID: 3723 case PRIV_CRED_SETEGID: 3724 case PRIV_CRED_SETGROUPS: 3725 case PRIV_CRED_SETREUID: 3726 case PRIV_CRED_SETREGID: 3727 case PRIV_CRED_SETRESUID: 3728 case PRIV_CRED_SETRESGID: 3729 3730 /* 3731 * Jail implements visibility constraints already, so allow 3732 * jailed root to override uid/gid-based constraints. 3733 */ 3734 case PRIV_SEEOTHERGIDS: 3735 case PRIV_SEEOTHERUIDS: 3736 3737 /* 3738 * Jail implements inter-process debugging limits already, so 3739 * allow jailed root various debugging privileges. 3740 */ 3741 case PRIV_DEBUG_DIFFCRED: 3742 case PRIV_DEBUG_SUGID: 3743 case PRIV_DEBUG_UNPRIV: 3744 3745 /* 3746 * Allow jail to set various resource limits and login 3747 * properties, and for now, exceed process resource limits. 3748 */ 3749 case PRIV_PROC_LIMIT: 3750 case PRIV_PROC_SETLOGIN: 3751 case PRIV_PROC_SETRLIMIT: 3752 3753 /* 3754 * System V and POSIX IPC privileges are granted in jail. 3755 */ 3756 case PRIV_IPC_READ: 3757 case PRIV_IPC_WRITE: 3758 case PRIV_IPC_ADMIN: 3759 case PRIV_IPC_MSGSIZE: 3760 case PRIV_MQ_ADMIN: 3761 3762 /* 3763 * Jail operations within a jail work on child jails. 3764 */ 3765 case PRIV_JAIL_ATTACH: 3766 case PRIV_JAIL_SET: 3767 case PRIV_JAIL_REMOVE: 3768 3769 /* 3770 * Jail implements its own inter-process limits, so allow 3771 * root processes in jail to change scheduling on other 3772 * processes in the same jail. Likewise for signalling. 3773 */ 3774 case PRIV_SCHED_DIFFCRED: 3775 case PRIV_SCHED_CPUSET: 3776 case PRIV_SIGNAL_DIFFCRED: 3777 case PRIV_SIGNAL_SUGID: 3778 3779 /* 3780 * Allow jailed processes to write to sysctls marked as jail 3781 * writable. 3782 */ 3783 case PRIV_SYSCTL_WRITEJAIL: 3784 3785 /* 3786 * Allow root in jail to manage a variety of quota 3787 * properties. These should likely be conditional on a 3788 * configuration option. 3789 */ 3790 case PRIV_VFS_GETQUOTA: 3791 case PRIV_VFS_SETQUOTA: 3792 3793 /* 3794 * Since Jail relies on chroot() to implement file system 3795 * protections, grant many VFS privileges to root in jail. 3796 * Be careful to exclude mount-related and NFS-related 3797 * privileges. 3798 */ 3799 case PRIV_VFS_READ: 3800 case PRIV_VFS_WRITE: 3801 case PRIV_VFS_ADMIN: 3802 case PRIV_VFS_EXEC: 3803 case PRIV_VFS_LOOKUP: 3804 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3805 case PRIV_VFS_CHFLAGS_DEV: 3806 case PRIV_VFS_CHOWN: 3807 case PRIV_VFS_CHROOT: 3808 case PRIV_VFS_RETAINSUGID: 3809 case PRIV_VFS_FCHROOT: 3810 case PRIV_VFS_LINK: 3811 case PRIV_VFS_SETGID: 3812 case PRIV_VFS_STAT: 3813 case PRIV_VFS_STICKYFILE: 3814 return (0); 3815 3816 /* 3817 * Depending on the global setting, allow privilege of 3818 * setting system flags. 3819 */ 3820 case PRIV_VFS_SYSFLAGS: 3821 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3822 return (0); 3823 else 3824 return (EPERM); 3825 3826 /* 3827 * Depending on the global setting, allow privilege of 3828 * mounting/unmounting file systems. 3829 */ 3830 case PRIV_VFS_MOUNT: 3831 case PRIV_VFS_UNMOUNT: 3832 case PRIV_VFS_MOUNT_NONUSER: 3833 case PRIV_VFS_MOUNT_OWNER: 3834 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT) 3835 return (0); 3836 else 3837 return (EPERM); 3838 3839 /* 3840 * Allow jailed root to bind reserved ports and reuse in-use 3841 * ports. 3842 */ 3843 case PRIV_NETINET_RESERVEDPORT: 3844 case PRIV_NETINET_REUSEPORT: 3845 return (0); 3846 3847 /* 3848 * Allow jailed root to set certian IPv4/6 (option) headers. 3849 */ 3850 case PRIV_NETINET_SETHDROPTS: 3851 return (0); 3852 3853 /* 3854 * Conditionally allow creating raw sockets in jail. 3855 */ 3856 case PRIV_NETINET_RAW: 3857 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3858 return (0); 3859 else 3860 return (EPERM); 3861 3862 /* 3863 * Since jail implements its own visibility limits on netstat 3864 * sysctls, allow getcred. This allows identd to work in 3865 * jail. 3866 */ 3867 case PRIV_NETINET_GETCRED: 3868 return (0); 3869 3870 default: 3871 /* 3872 * In all remaining cases, deny the privilege request. This 3873 * includes almost all network privileges, many system 3874 * configuration privileges. 3875 */ 3876 return (EPERM); 3877 } 3878 } 3879 3880 /* 3881 * Return the part of pr2's name that is relative to pr1, or the whole name 3882 * if it does not directly follow. 3883 */ 3884 3885 char * 3886 prison_name(struct prison *pr1, struct prison *pr2) 3887 { 3888 char *name; 3889 3890 /* Jails see themselves as "" (if they see themselves at all). */ 3891 if (pr1 == pr2) 3892 return ""; 3893 name = pr2->pr_name; 3894 if (prison_ischild(pr1, pr2)) { 3895 /* 3896 * pr1 isn't locked (and allprison_lock may not be either) 3897 * so its length can't be counted on. But the number of dots 3898 * can be counted on - and counted. 3899 */ 3900 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3901 name = strchr(name, '.') + 1; 3902 } 3903 return (name); 3904 } 3905 3906 /* 3907 * Return the part of pr2's path that is relative to pr1, or the whole path 3908 * if it does not directly follow. 3909 */ 3910 static char * 3911 prison_path(struct prison *pr1, struct prison *pr2) 3912 { 3913 char *path1, *path2; 3914 int len1; 3915 3916 path1 = pr1->pr_path; 3917 path2 = pr2->pr_path; 3918 if (!strcmp(path1, "/")) 3919 return (path2); 3920 len1 = strlen(path1); 3921 if (strncmp(path1, path2, len1)) 3922 return (path2); 3923 if (path2[len1] == '\0') 3924 return "/"; 3925 if (path2[len1] == '/') 3926 return (path2 + len1); 3927 return (path2); 3928 } 3929 3930 3931 /* 3932 * Jail-related sysctls. 3933 */ 3934 SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 3935 "Jails"); 3936 3937 static int 3938 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3939 { 3940 struct xprison *xp; 3941 struct prison *pr, *cpr; 3942 #ifdef INET 3943 struct in_addr *ip4 = NULL; 3944 int ip4s = 0; 3945 #endif 3946 #ifdef INET6 3947 struct in_addr *ip6 = NULL; 3948 int ip6s = 0; 3949 #endif 3950 int descend, error; 3951 3952 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3953 pr = req->td->td_ucred->cr_prison; 3954 error = 0; 3955 sx_slock(&allprison_lock); 3956 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3957 #if defined(INET) || defined(INET6) 3958 again: 3959 #endif 3960 mtx_lock(&cpr->pr_mtx); 3961 #ifdef INET 3962 if (cpr->pr_ip4s > 0) { 3963 if (ip4s < cpr->pr_ip4s) { 3964 ip4s = cpr->pr_ip4s; 3965 mtx_unlock(&cpr->pr_mtx); 3966 ip4 = realloc(ip4, ip4s * 3967 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3968 goto again; 3969 } 3970 bcopy(cpr->pr_ip4, ip4, 3971 cpr->pr_ip4s * sizeof(struct in_addr)); 3972 } 3973 #endif 3974 #ifdef INET6 3975 if (cpr->pr_ip6s > 0) { 3976 if (ip6s < cpr->pr_ip6s) { 3977 ip6s = cpr->pr_ip6s; 3978 mtx_unlock(&cpr->pr_mtx); 3979 ip6 = realloc(ip6, ip6s * 3980 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 3981 goto again; 3982 } 3983 bcopy(cpr->pr_ip6, ip6, 3984 cpr->pr_ip6s * sizeof(struct in6_addr)); 3985 } 3986 #endif 3987 if (cpr->pr_ref == 0) { 3988 mtx_unlock(&cpr->pr_mtx); 3989 continue; 3990 } 3991 bzero(xp, sizeof(*xp)); 3992 xp->pr_version = XPRISON_VERSION; 3993 xp->pr_id = cpr->pr_id; 3994 xp->pr_state = cpr->pr_uref > 0 3995 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 3996 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 3997 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 3998 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 3999 #ifdef INET 4000 xp->pr_ip4s = cpr->pr_ip4s; 4001 #endif 4002 #ifdef INET6 4003 xp->pr_ip6s = cpr->pr_ip6s; 4004 #endif 4005 mtx_unlock(&cpr->pr_mtx); 4006 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4007 if (error) 4008 break; 4009 #ifdef INET 4010 if (xp->pr_ip4s > 0) { 4011 error = SYSCTL_OUT(req, ip4, 4012 xp->pr_ip4s * sizeof(struct in_addr)); 4013 if (error) 4014 break; 4015 } 4016 #endif 4017 #ifdef INET6 4018 if (xp->pr_ip6s > 0) { 4019 error = SYSCTL_OUT(req, ip6, 4020 xp->pr_ip6s * sizeof(struct in6_addr)); 4021 if (error) 4022 break; 4023 } 4024 #endif 4025 } 4026 sx_sunlock(&allprison_lock); 4027 free(xp, M_TEMP); 4028 #ifdef INET 4029 free(ip4, M_TEMP); 4030 #endif 4031 #ifdef INET6 4032 free(ip6, M_TEMP); 4033 #endif 4034 return (error); 4035 } 4036 4037 SYSCTL_OID(_security_jail, OID_AUTO, list, 4038 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4039 sysctl_jail_list, "S", "List of active jails"); 4040 4041 static int 4042 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4043 { 4044 int error, injail; 4045 4046 injail = jailed(req->td->td_ucred); 4047 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4048 4049 return (error); 4050 } 4051 4052 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4053 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4054 sysctl_jail_jailed, "I", "Process in jail?"); 4055 4056 #if defined(INET) || defined(INET6) 4057 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4058 &jail_max_af_ips, 0, 4059 "Number of IP addresses a jail may have at most per address family"); 4060 #endif 4061 4062 /* 4063 * Default parameters for jail(2) compatability. For historical reasons, 4064 * the sysctl names have varying similarity to the parameter names. Prisons 4065 * just see their own parameters, and can't change them. 4066 */ 4067 static int 4068 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4069 { 4070 struct prison *pr; 4071 int allow, error, i; 4072 4073 pr = req->td->td_ucred->cr_prison; 4074 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4075 4076 /* Get the current flag value, and convert it to a boolean. */ 4077 i = (allow & arg2) ? 1 : 0; 4078 if (arg1 != NULL) 4079 i = !i; 4080 error = sysctl_handle_int(oidp, &i, 0, req); 4081 if (error || !req->newptr) 4082 return (error); 4083 i = i ? arg2 : 0; 4084 if (arg1 != NULL) 4085 i ^= arg2; 4086 /* 4087 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4088 * for writing. 4089 */ 4090 mtx_lock(&prison0.pr_mtx); 4091 jail_default_allow = (jail_default_allow & ~arg2) | i; 4092 mtx_unlock(&prison0.pr_mtx); 4093 return (0); 4094 } 4095 4096 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4097 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4098 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4099 "Processes in jail can set their hostnames"); 4100 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4101 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4102 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4103 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 4104 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4105 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4106 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4107 "Processes in jail can use System V IPC primitives"); 4108 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4109 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4110 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4111 "Prison root can create raw sockets"); 4112 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4113 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4114 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4115 "Processes in jail can alter system file flags"); 4116 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4117 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4118 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4119 "Processes in jail can mount/unmount jail-friendly file systems"); 4120 4121 static int 4122 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4123 { 4124 struct prison *pr; 4125 int level, error; 4126 4127 pr = req->td->td_ucred->cr_prison; 4128 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4129 error = sysctl_handle_int(oidp, &level, 0, req); 4130 if (error || !req->newptr) 4131 return (error); 4132 *(int *)arg1 = level; 4133 return (0); 4134 } 4135 4136 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4137 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4138 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4139 sysctl_jail_default_level, "I", 4140 "Processes in jail cannot see all mounted file systems"); 4141 4142 /* 4143 * Nodes to describe jail parameters. Maximum length of string parameters 4144 * is returned in the string itself, and the other parameters exist merely 4145 * to make themselves and their types known. 4146 */ 4147 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4148 "Jail parameters"); 4149 4150 int 4151 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4152 { 4153 int i; 4154 long l; 4155 size_t s; 4156 char numbuf[12]; 4157 4158 switch (oidp->oid_kind & CTLTYPE) 4159 { 4160 case CTLTYPE_LONG: 4161 case CTLTYPE_ULONG: 4162 l = 0; 4163 #ifdef SCTL_MASK32 4164 if (!(req->flags & SCTL_MASK32)) 4165 #endif 4166 return (SYSCTL_OUT(req, &l, sizeof(l))); 4167 case CTLTYPE_INT: 4168 case CTLTYPE_UINT: 4169 i = 0; 4170 return (SYSCTL_OUT(req, &i, sizeof(i))); 4171 case CTLTYPE_STRING: 4172 snprintf(numbuf, sizeof(numbuf), "%d", arg2); 4173 return 4174 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4175 case CTLTYPE_STRUCT: 4176 s = (size_t)arg2; 4177 return (SYSCTL_OUT(req, &s, sizeof(s))); 4178 } 4179 return (0); 4180 } 4181 4182 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4183 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4184 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4185 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4186 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4187 "I", "Jail secure level"); 4188 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4189 "I", "Jail cannot see all mounted file systems"); 4190 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4191 "B", "Jail persistence"); 4192 #ifdef VIMAGE 4193 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4194 "E,jailsys", "Virtual network stack"); 4195 #endif 4196 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4197 "B", "Jail is in the process of shutting down"); 4198 4199 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4200 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4201 "I", "Current number of child jails"); 4202 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4203 "I", "Maximum number of child jails"); 4204 4205 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4206 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4207 "Jail hostname"); 4208 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4209 "Jail NIS domainname"); 4210 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4211 "Jail host UUID"); 4212 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4213 "LU", "Jail host ID"); 4214 4215 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4216 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4217 4218 #ifdef INET 4219 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4220 "Jail IPv4 address virtualization"); 4221 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4222 "S,in_addr,a", "Jail IPv4 addresses"); 4223 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4224 "B", "Do (not) use IPv4 source address selection rather than the " 4225 "primary jail IPv4 address."); 4226 #endif 4227 #ifdef INET6 4228 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4229 "Jail IPv6 address virtualization"); 4230 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4231 "S,in6_addr,a", "Jail IPv6 addresses"); 4232 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4233 "B", "Do (not) use IPv6 source address selection rather than the " 4234 "primary jail IPv6 address."); 4235 #endif 4236 4237 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4238 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4239 "B", "Jail may set hostname"); 4240 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4241 "B", "Jail may use SYSV IPC"); 4242 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4243 "B", "Jail may create raw sockets"); 4244 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4245 "B", "Jail may alter system file flags"); 4246 SYSCTL_JAIL_PARAM(_allow, mount, CTLTYPE_INT | CTLFLAG_RW, 4247 "B", "Jail may mount/unmount jail-friendly file systems"); 4248 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4249 "B", "Jail may set file quotas"); 4250 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4251 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4252 4253 4254 #ifdef DDB 4255 4256 static void 4257 db_show_prison(struct prison *pr) 4258 { 4259 int fi; 4260 #if defined(INET) || defined(INET6) 4261 int ii; 4262 #endif 4263 unsigned jsf; 4264 #ifdef INET6 4265 char ip6buf[INET6_ADDRSTRLEN]; 4266 #endif 4267 4268 db_printf("prison %p:\n", pr); 4269 db_printf(" jid = %d\n", pr->pr_id); 4270 db_printf(" name = %s\n", pr->pr_name); 4271 db_printf(" parent = %p\n", pr->pr_parent); 4272 db_printf(" ref = %d\n", pr->pr_ref); 4273 db_printf(" uref = %d\n", pr->pr_uref); 4274 db_printf(" path = %s\n", pr->pr_path); 4275 db_printf(" cpuset = %d\n", pr->pr_cpuset 4276 ? pr->pr_cpuset->cs_id : -1); 4277 #ifdef VIMAGE 4278 db_printf(" vnet = %p\n", pr->pr_vnet); 4279 #endif 4280 db_printf(" root = %p\n", pr->pr_root); 4281 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4282 db_printf(" children.max = %d\n", pr->pr_childmax); 4283 db_printf(" children.cur = %d\n", pr->pr_childcount); 4284 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4285 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4286 db_printf(" flags = 0x%x", pr->pr_flags); 4287 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4288 fi++) 4289 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4290 db_printf(" %s", pr_flag_names[fi]); 4291 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4292 fi++) { 4293 jsf = pr->pr_flags & 4294 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4295 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4296 pr_flag_jailsys[fi].disable && 4297 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4298 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4299 : "inherit"); 4300 } 4301 db_printf(" allow = 0x%x", pr->pr_allow); 4302 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4303 fi++) 4304 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4305 db_printf(" %s", pr_allow_names[fi]); 4306 db_printf("\n"); 4307 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4308 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4309 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4310 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4311 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4312 #ifdef INET 4313 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4314 for (ii = 0; ii < pr->pr_ip4s; ii++) 4315 db_printf(" %s %s\n", 4316 ii == 0 ? "ip4.addr =" : " ", 4317 inet_ntoa(pr->pr_ip4[ii])); 4318 #endif 4319 #ifdef INET6 4320 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4321 for (ii = 0; ii < pr->pr_ip6s; ii++) 4322 db_printf(" %s %s\n", 4323 ii == 0 ? "ip6.addr =" : " ", 4324 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4325 #endif 4326 } 4327 4328 DB_SHOW_COMMAND(prison, db_show_prison_command) 4329 { 4330 struct prison *pr; 4331 4332 if (!have_addr) { 4333 /* 4334 * Show all prisons in the list, and prison0 which is not 4335 * listed. 4336 */ 4337 db_show_prison(&prison0); 4338 if (!db_pager_quit) { 4339 TAILQ_FOREACH(pr, &allprison, pr_list) { 4340 db_show_prison(pr); 4341 if (db_pager_quit) 4342 break; 4343 } 4344 } 4345 return; 4346 } 4347 4348 if (addr == 0) 4349 pr = &prison0; 4350 else { 4351 /* Look for a prison with the ID and with references. */ 4352 TAILQ_FOREACH(pr, &allprison, pr_list) 4353 if (pr->pr_id == addr && pr->pr_ref > 0) 4354 break; 4355 if (pr == NULL) 4356 /* Look again, without requiring a reference. */ 4357 TAILQ_FOREACH(pr, &allprison, pr_list) 4358 if (pr->pr_id == addr) 4359 break; 4360 if (pr == NULL) 4361 /* Assume address points to a valid prison. */ 4362 pr = (struct prison *)addr; 4363 } 4364 db_show_prison(pr); 4365 } 4366 4367 #endif /* DDB */
Cache object: cb2f9b1497bc571fee795af35ab5dcd7
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