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/11.0/sys/kern/kern_jail.c 301764 2016-06-09 21:59:11Z 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/racct.h> 53 #include <sys/refcount.h> 54 #include <sys/sx.h> 55 #include <sys/sysent.h> 56 #include <sys/namei.h> 57 #include <sys/mount.h> 58 #include <sys/queue.h> 59 #include <sys/socket.h> 60 #include <sys/syscallsubr.h> 61 #include <sys/sysctl.h> 62 #include <sys/vnode.h> 63 64 #include <net/if.h> 65 #include <net/vnet.h> 66 67 #include <netinet/in.h> 68 69 #ifdef DDB 70 #include <ddb/ddb.h> 71 #endif /* DDB */ 72 73 #include <security/mac/mac_framework.h> 74 75 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 76 77 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 78 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct 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_devfs_rsnum = 0, 104 .pr_childmax = JAIL_MAX, 105 .pr_hostuuid = DEFAULT_HOSTUUID, 106 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 107 #ifdef VIMAGE 108 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 109 #else 110 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 111 #endif 112 .pr_allow = PR_ALLOW_ALL, 113 }; 114 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 115 116 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 117 struct sx allprison_lock; 118 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 119 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 120 LIST_HEAD(, prison_racct) allprison_racct; 121 int lastprid = 0; 122 123 static int do_jail_attach(struct thread *td, struct prison *pr); 124 static void prison_complete(void *context, int pending); 125 static void prison_deref(struct prison *pr, int flags); 126 static char *prison_path(struct prison *pr1, struct prison *pr2); 127 static void prison_remove_one(struct prison *pr); 128 #ifdef RACCT 129 static void prison_racct_attach(struct prison *pr); 130 static void prison_racct_modify(struct prison *pr); 131 static void prison_racct_detach(struct prison *pr); 132 #endif 133 #ifdef INET 134 static int _prison_check_ip4(const struct prison *, const struct in_addr *); 135 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4); 136 #endif 137 #ifdef INET6 138 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6); 139 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6); 140 #endif 141 142 /* Flags for prison_deref */ 143 #define PD_DEREF 0x01 144 #define PD_DEUREF 0x02 145 #define PD_LOCKED 0x04 146 #define PD_LIST_SLOCKED 0x08 147 #define PD_LIST_XLOCKED 0x10 148 149 /* 150 * Parameter names corresponding to PR_* flag values. Size values are for kvm 151 * as we cannot figure out the size of a sparse array, or an array without a 152 * terminating entry. 153 */ 154 static char *pr_flag_names[] = { 155 [0] = "persist", 156 #ifdef INET 157 [7] = "ip4.saddrsel", 158 #endif 159 #ifdef INET6 160 [8] = "ip6.saddrsel", 161 #endif 162 }; 163 const size_t pr_flag_names_size = sizeof(pr_flag_names); 164 165 static char *pr_flag_nonames[] = { 166 [0] = "nopersist", 167 #ifdef INET 168 [7] = "ip4.nosaddrsel", 169 #endif 170 #ifdef INET6 171 [8] = "ip6.nosaddrsel", 172 #endif 173 }; 174 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames); 175 176 struct jailsys_flags { 177 const char *name; 178 unsigned disable; 179 unsigned new; 180 } pr_flag_jailsys[] = { 181 { "host", 0, PR_HOST }, 182 #ifdef VIMAGE 183 { "vnet", 0, PR_VNET }, 184 #endif 185 #ifdef INET 186 { "ip4", PR_IP4_USER, PR_IP4_USER }, 187 #endif 188 #ifdef INET6 189 { "ip6", PR_IP6_USER, PR_IP6_USER }, 190 #endif 191 }; 192 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 193 194 static char *pr_allow_names[] = { 195 "allow.set_hostname", 196 "allow.sysvipc", 197 "allow.raw_sockets", 198 "allow.chflags", 199 "allow.mount", 200 "allow.quotas", 201 "allow.socket_af", 202 "allow.mount.devfs", 203 "allow.mount.nullfs", 204 "allow.mount.zfs", 205 "allow.mount.procfs", 206 "allow.mount.tmpfs", 207 "allow.mount.fdescfs", 208 "allow.mount.linprocfs", 209 "allow.mount.linsysfs", 210 }; 211 const size_t pr_allow_names_size = sizeof(pr_allow_names); 212 213 static char *pr_allow_nonames[] = { 214 "allow.noset_hostname", 215 "allow.nosysvipc", 216 "allow.noraw_sockets", 217 "allow.nochflags", 218 "allow.nomount", 219 "allow.noquotas", 220 "allow.nosocket_af", 221 "allow.mount.nodevfs", 222 "allow.mount.nonullfs", 223 "allow.mount.nozfs", 224 "allow.mount.noprocfs", 225 "allow.mount.notmpfs", 226 "allow.mount.nofdescfs", 227 "allow.mount.nolinprocfs", 228 "allow.mount.nolinsysfs", 229 }; 230 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames); 231 232 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 233 #define JAIL_DEFAULT_ENFORCE_STATFS 2 234 #define JAIL_DEFAULT_DEVFS_RSNUM 0 235 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 236 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 237 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 238 #if defined(INET) || defined(INET6) 239 static unsigned jail_max_af_ips = 255; 240 #endif 241 242 /* 243 * Initialize the parts of prison0 that can't be static-initialized with 244 * constants. This is called from proc0_init() after creating thread0 cpuset. 245 */ 246 void 247 prison0_init(void) 248 { 249 250 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 251 prison0.pr_osreldate = osreldate; 252 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 253 } 254 255 #ifdef INET 256 static int 257 qcmp_v4(const void *ip1, const void *ip2) 258 { 259 in_addr_t iaa, iab; 260 261 /* 262 * We need to compare in HBO here to get the list sorted as expected 263 * by the result of the code. Sorting NBO addresses gives you 264 * interesting results. If you do not understand, do not try. 265 */ 266 iaa = ntohl(((const struct in_addr *)ip1)->s_addr); 267 iab = ntohl(((const struct in_addr *)ip2)->s_addr); 268 269 /* 270 * Do not simply return the difference of the two numbers, the int is 271 * not wide enough. 272 */ 273 if (iaa > iab) 274 return (1); 275 else if (iaa < iab) 276 return (-1); 277 else 278 return (0); 279 } 280 #endif 281 282 #ifdef INET6 283 static int 284 qcmp_v6(const void *ip1, const void *ip2) 285 { 286 const struct in6_addr *ia6a, *ia6b; 287 int i, rc; 288 289 ia6a = (const struct in6_addr *)ip1; 290 ia6b = (const struct in6_addr *)ip2; 291 292 rc = 0; 293 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 294 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 295 rc = 1; 296 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 297 rc = -1; 298 } 299 return (rc); 300 } 301 #endif 302 303 /* 304 * struct jail_args { 305 * struct jail *jail; 306 * }; 307 */ 308 int 309 sys_jail(struct thread *td, struct jail_args *uap) 310 { 311 uint32_t version; 312 int error; 313 struct jail j; 314 315 error = copyin(uap->jail, &version, sizeof(uint32_t)); 316 if (error) 317 return (error); 318 319 switch (version) { 320 case 0: 321 { 322 struct jail_v0 j0; 323 324 /* FreeBSD single IPv4 jails. */ 325 bzero(&j, sizeof(struct jail)); 326 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 327 if (error) 328 return (error); 329 j.version = j0.version; 330 j.path = j0.path; 331 j.hostname = j0.hostname; 332 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 333 break; 334 } 335 336 case 1: 337 /* 338 * Version 1 was used by multi-IPv4 jail implementations 339 * that never made it into the official kernel. 340 */ 341 return (EINVAL); 342 343 case 2: /* JAIL_API_VERSION */ 344 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 345 error = copyin(uap->jail, &j, sizeof(struct jail)); 346 if (error) 347 return (error); 348 break; 349 350 default: 351 /* Sci-Fi jails are not supported, sorry. */ 352 return (EINVAL); 353 } 354 return (kern_jail(td, &j)); 355 } 356 357 int 358 kern_jail(struct thread *td, struct jail *j) 359 { 360 struct iovec optiov[2 * (4 + nitems(pr_allow_names) 361 #ifdef INET 362 + 1 363 #endif 364 #ifdef INET6 365 + 1 366 #endif 367 )]; 368 struct uio opt; 369 char *u_path, *u_hostname, *u_name; 370 #ifdef INET 371 uint32_t ip4s; 372 struct in_addr *u_ip4; 373 #endif 374 #ifdef INET6 375 struct in6_addr *u_ip6; 376 #endif 377 size_t tmplen; 378 int error, enforce_statfs, fi; 379 380 bzero(&optiov, sizeof(optiov)); 381 opt.uio_iov = optiov; 382 opt.uio_iovcnt = 0; 383 opt.uio_offset = -1; 384 opt.uio_resid = -1; 385 opt.uio_segflg = UIO_SYSSPACE; 386 opt.uio_rw = UIO_READ; 387 opt.uio_td = td; 388 389 /* Set permissions for top-level jails from sysctls. */ 390 if (!jailed(td->td_ucred)) { 391 for (fi = 0; fi < nitems(pr_allow_names); fi++) { 392 optiov[opt.uio_iovcnt].iov_base = 393 (jail_default_allow & (1 << fi)) 394 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 395 optiov[opt.uio_iovcnt].iov_len = 396 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 397 opt.uio_iovcnt += 2; 398 } 399 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 400 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 401 opt.uio_iovcnt++; 402 enforce_statfs = jail_default_enforce_statfs; 403 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 404 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 405 opt.uio_iovcnt++; 406 } 407 408 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 409 #ifdef INET 410 ip4s = (j->version == 0) ? 1 : j->ip4s; 411 if (ip4s > jail_max_af_ips) 412 return (EINVAL); 413 tmplen += ip4s * sizeof(struct in_addr); 414 #else 415 if (j->ip4s > 0) 416 return (EINVAL); 417 #endif 418 #ifdef INET6 419 if (j->ip6s > jail_max_af_ips) 420 return (EINVAL); 421 tmplen += j->ip6s * sizeof(struct in6_addr); 422 #else 423 if (j->ip6s > 0) 424 return (EINVAL); 425 #endif 426 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 427 u_hostname = u_path + MAXPATHLEN; 428 u_name = u_hostname + MAXHOSTNAMELEN; 429 #ifdef INET 430 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 431 #endif 432 #ifdef INET6 433 #ifdef INET 434 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 435 #else 436 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 437 #endif 438 #endif 439 optiov[opt.uio_iovcnt].iov_base = "path"; 440 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 441 opt.uio_iovcnt++; 442 optiov[opt.uio_iovcnt].iov_base = u_path; 443 error = copyinstr(j->path, u_path, MAXPATHLEN, 444 &optiov[opt.uio_iovcnt].iov_len); 445 if (error) { 446 free(u_path, M_TEMP); 447 return (error); 448 } 449 opt.uio_iovcnt++; 450 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 451 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 452 opt.uio_iovcnt++; 453 optiov[opt.uio_iovcnt].iov_base = u_hostname; 454 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 455 &optiov[opt.uio_iovcnt].iov_len); 456 if (error) { 457 free(u_path, M_TEMP); 458 return (error); 459 } 460 opt.uio_iovcnt++; 461 if (j->jailname != NULL) { 462 optiov[opt.uio_iovcnt].iov_base = "name"; 463 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 464 opt.uio_iovcnt++; 465 optiov[opt.uio_iovcnt].iov_base = u_name; 466 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 467 &optiov[opt.uio_iovcnt].iov_len); 468 if (error) { 469 free(u_path, M_TEMP); 470 return (error); 471 } 472 opt.uio_iovcnt++; 473 } 474 #ifdef INET 475 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 476 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 477 opt.uio_iovcnt++; 478 optiov[opt.uio_iovcnt].iov_base = u_ip4; 479 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 480 if (j->version == 0) 481 u_ip4->s_addr = j->ip4s; 482 else { 483 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 484 if (error) { 485 free(u_path, M_TEMP); 486 return (error); 487 } 488 } 489 opt.uio_iovcnt++; 490 #endif 491 #ifdef INET6 492 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 493 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 494 opt.uio_iovcnt++; 495 optiov[opt.uio_iovcnt].iov_base = u_ip6; 496 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 497 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 498 if (error) { 499 free(u_path, M_TEMP); 500 return (error); 501 } 502 opt.uio_iovcnt++; 503 #endif 504 KASSERT(opt.uio_iovcnt <= nitems(optiov), 505 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 506 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 507 free(u_path, M_TEMP); 508 return (error); 509 } 510 511 512 /* 513 * struct jail_set_args { 514 * struct iovec *iovp; 515 * unsigned int iovcnt; 516 * int flags; 517 * }; 518 */ 519 int 520 sys_jail_set(struct thread *td, struct jail_set_args *uap) 521 { 522 struct uio *auio; 523 int error; 524 525 /* Check that we have an even number of iovecs. */ 526 if (uap->iovcnt & 1) 527 return (EINVAL); 528 529 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 530 if (error) 531 return (error); 532 error = kern_jail_set(td, auio, uap->flags); 533 free(auio, M_IOV); 534 return (error); 535 } 536 537 int 538 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 539 { 540 struct nameidata nd; 541 #ifdef INET 542 struct in_addr *ip4; 543 #endif 544 #ifdef INET6 545 struct in6_addr *ip6; 546 #endif 547 struct vfsopt *opt; 548 struct vfsoptlist *opts; 549 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 550 struct vnode *root; 551 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 552 char *g_path, *osrelstr; 553 #if defined(INET) || defined(INET6) 554 struct prison *tppr; 555 void *op; 556 #endif 557 unsigned long hid; 558 size_t namelen, onamelen, pnamelen; 559 int born, created, cuflags, descend, enforce; 560 int error, errmsg_len, errmsg_pos; 561 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 562 int fi, jid, jsys, len, level; 563 int childmax, osreldt, rsnum, slevel; 564 int fullpath_disabled; 565 #if defined(INET) || defined(INET6) 566 int ii, ij; 567 #endif 568 #ifdef INET 569 int ip4s, redo_ip4; 570 #endif 571 #ifdef INET6 572 int ip6s, redo_ip6; 573 #endif 574 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 575 unsigned tallow; 576 char numbuf[12]; 577 578 error = priv_check(td, PRIV_JAIL_SET); 579 if (!error && (flags & JAIL_ATTACH)) 580 error = priv_check(td, PRIV_JAIL_ATTACH); 581 if (error) 582 return (error); 583 mypr = td->td_ucred->cr_prison; 584 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 585 return (EPERM); 586 if (flags & ~JAIL_SET_MASK) 587 return (EINVAL); 588 589 /* 590 * Check all the parameters before committing to anything. Not all 591 * errors can be caught early, but we may as well try. Also, this 592 * takes care of some expensive stuff (path lookup) before getting 593 * the allprison lock. 594 * 595 * XXX Jails are not filesystems, and jail parameters are not mount 596 * options. But it makes more sense to re-use the vfsopt code 597 * than duplicate it under a different name. 598 */ 599 error = vfs_buildopts(optuio, &opts); 600 if (error) 601 return (error); 602 #ifdef INET 603 ip4 = NULL; 604 #endif 605 #ifdef INET6 606 ip6 = NULL; 607 #endif 608 g_path = NULL; 609 610 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 611 if (!cuflags) { 612 error = EINVAL; 613 vfs_opterror(opts, "no valid operation (create or update)"); 614 goto done_errmsg; 615 } 616 617 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 618 if (error == ENOENT) 619 jid = 0; 620 else if (error != 0) 621 goto done_free; 622 623 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 624 if (error == ENOENT) 625 gotslevel = 0; 626 else if (error != 0) 627 goto done_free; 628 else 629 gotslevel = 1; 630 631 error = 632 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 633 if (error == ENOENT) 634 gotchildmax = 0; 635 else if (error != 0) 636 goto done_free; 637 else 638 gotchildmax = 1; 639 640 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 641 if (error == ENOENT) 642 gotenforce = 0; 643 else if (error != 0) 644 goto done_free; 645 else if (enforce < 0 || enforce > 2) { 646 error = EINVAL; 647 goto done_free; 648 } else 649 gotenforce = 1; 650 651 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 652 if (error == ENOENT) 653 gotrsnum = 0; 654 else if (error != 0) 655 goto done_free; 656 else 657 gotrsnum = 1; 658 659 pr_flags = ch_flags = 0; 660 for (fi = 0; fi < nitems(pr_flag_names); fi++) { 661 if (pr_flag_names[fi] == NULL) 662 continue; 663 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 664 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 665 } 666 ch_flags |= pr_flags; 667 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) { 668 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 669 sizeof(jsys)); 670 if (error == ENOENT) 671 continue; 672 if (error != 0) 673 goto done_free; 674 switch (jsys) { 675 case JAIL_SYS_DISABLE: 676 if (!pr_flag_jailsys[fi].disable) { 677 error = EINVAL; 678 goto done_free; 679 } 680 pr_flags |= pr_flag_jailsys[fi].disable; 681 break; 682 case JAIL_SYS_NEW: 683 pr_flags |= pr_flag_jailsys[fi].new; 684 break; 685 case JAIL_SYS_INHERIT: 686 break; 687 default: 688 error = EINVAL; 689 goto done_free; 690 } 691 ch_flags |= 692 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 693 } 694 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 695 && !(pr_flags & PR_PERSIST)) { 696 error = EINVAL; 697 vfs_opterror(opts, "new jail must persist or attach"); 698 goto done_errmsg; 699 } 700 #ifdef VIMAGE 701 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 702 error = EINVAL; 703 vfs_opterror(opts, "vnet cannot be changed after creation"); 704 goto done_errmsg; 705 } 706 #endif 707 #ifdef INET 708 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 709 error = EINVAL; 710 vfs_opterror(opts, "ip4 cannot be changed after creation"); 711 goto done_errmsg; 712 } 713 #endif 714 #ifdef INET6 715 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 716 error = EINVAL; 717 vfs_opterror(opts, "ip6 cannot be changed after creation"); 718 goto done_errmsg; 719 } 720 #endif 721 722 pr_allow = ch_allow = 0; 723 for (fi = 0; fi < nitems(pr_allow_names); fi++) { 724 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 725 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 726 } 727 ch_allow |= pr_allow; 728 729 error = vfs_getopt(opts, "name", (void **)&name, &len); 730 if (error == ENOENT) 731 name = NULL; 732 else if (error != 0) 733 goto done_free; 734 else { 735 if (len == 0 || name[len - 1] != '\0') { 736 error = EINVAL; 737 goto done_free; 738 } 739 if (len > MAXHOSTNAMELEN) { 740 error = ENAMETOOLONG; 741 goto done_free; 742 } 743 } 744 745 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 746 if (error == ENOENT) 747 host = NULL; 748 else if (error != 0) 749 goto done_free; 750 else { 751 ch_flags |= PR_HOST; 752 pr_flags |= PR_HOST; 753 if (len == 0 || host[len - 1] != '\0') { 754 error = EINVAL; 755 goto done_free; 756 } 757 if (len > MAXHOSTNAMELEN) { 758 error = ENAMETOOLONG; 759 goto done_free; 760 } 761 } 762 763 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 764 if (error == ENOENT) 765 domain = NULL; 766 else if (error != 0) 767 goto done_free; 768 else { 769 ch_flags |= PR_HOST; 770 pr_flags |= PR_HOST; 771 if (len == 0 || domain[len - 1] != '\0') { 772 error = EINVAL; 773 goto done_free; 774 } 775 if (len > MAXHOSTNAMELEN) { 776 error = ENAMETOOLONG; 777 goto done_free; 778 } 779 } 780 781 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 782 if (error == ENOENT) 783 uuid = NULL; 784 else if (error != 0) 785 goto done_free; 786 else { 787 ch_flags |= PR_HOST; 788 pr_flags |= PR_HOST; 789 if (len == 0 || uuid[len - 1] != '\0') { 790 error = EINVAL; 791 goto done_free; 792 } 793 if (len > HOSTUUIDLEN) { 794 error = ENAMETOOLONG; 795 goto done_free; 796 } 797 } 798 799 #ifdef COMPAT_FREEBSD32 800 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 801 uint32_t hid32; 802 803 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 804 hid = hid32; 805 } else 806 #endif 807 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 808 if (error == ENOENT) 809 gothid = 0; 810 else if (error != 0) 811 goto done_free; 812 else { 813 gothid = 1; 814 ch_flags |= PR_HOST; 815 pr_flags |= PR_HOST; 816 } 817 818 #ifdef INET 819 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 820 if (error == ENOENT) 821 ip4s = 0; 822 else if (error != 0) 823 goto done_free; 824 else if (ip4s & (sizeof(*ip4) - 1)) { 825 error = EINVAL; 826 goto done_free; 827 } else { 828 ch_flags |= PR_IP4_USER; 829 pr_flags |= PR_IP4_USER; 830 if (ip4s > 0) { 831 ip4s /= sizeof(*ip4); 832 if (ip4s > jail_max_af_ips) { 833 error = EINVAL; 834 vfs_opterror(opts, "too many IPv4 addresses"); 835 goto done_errmsg; 836 } 837 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 838 bcopy(op, ip4, ip4s * sizeof(*ip4)); 839 /* 840 * IP addresses are all sorted but ip[0] to preserve 841 * the primary IP address as given from userland. 842 * This special IP is used for unbound outgoing 843 * connections as well for "loopback" traffic in case 844 * source address selection cannot find any more fitting 845 * address to connect from. 846 */ 847 if (ip4s > 1) 848 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4); 849 /* 850 * Check for duplicate addresses and do some simple 851 * zero and broadcast checks. If users give other bogus 852 * addresses it is their problem. 853 * 854 * We do not have to care about byte order for these 855 * checks so we will do them in NBO. 856 */ 857 for (ii = 0; ii < ip4s; ii++) { 858 if (ip4[ii].s_addr == INADDR_ANY || 859 ip4[ii].s_addr == INADDR_BROADCAST) { 860 error = EINVAL; 861 goto done_free; 862 } 863 if ((ii+1) < ip4s && 864 (ip4[0].s_addr == ip4[ii+1].s_addr || 865 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 866 error = EINVAL; 867 goto done_free; 868 } 869 } 870 } 871 } 872 #endif 873 874 #ifdef INET6 875 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 876 if (error == ENOENT) 877 ip6s = 0; 878 else if (error != 0) 879 goto done_free; 880 else if (ip6s & (sizeof(*ip6) - 1)) { 881 error = EINVAL; 882 goto done_free; 883 } else { 884 ch_flags |= PR_IP6_USER; 885 pr_flags |= PR_IP6_USER; 886 if (ip6s > 0) { 887 ip6s /= sizeof(*ip6); 888 if (ip6s > jail_max_af_ips) { 889 error = EINVAL; 890 vfs_opterror(opts, "too many IPv6 addresses"); 891 goto done_errmsg; 892 } 893 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 894 bcopy(op, ip6, ip6s * sizeof(*ip6)); 895 if (ip6s > 1) 896 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6); 897 for (ii = 0; ii < ip6s; ii++) { 898 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 899 error = EINVAL; 900 goto done_free; 901 } 902 if ((ii+1) < ip6s && 903 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 904 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 905 { 906 error = EINVAL; 907 goto done_free; 908 } 909 } 910 } 911 } 912 #endif 913 914 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 915 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 916 error = EINVAL; 917 vfs_opterror(opts, 918 "vnet jails cannot have IP address restrictions"); 919 goto done_errmsg; 920 } 921 #endif 922 923 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 924 if (error == ENOENT) 925 osrelstr = NULL; 926 else if (error != 0) 927 goto done_free; 928 else { 929 if (flags & JAIL_UPDATE) { 930 error = EINVAL; 931 vfs_opterror(opts, 932 "osrelease cannot be changed after creation"); 933 goto done_errmsg; 934 } 935 if (len == 0 || len >= OSRELEASELEN) { 936 error = EINVAL; 937 vfs_opterror(opts, 938 "osrelease string must be 1-%d bytes long", 939 OSRELEASELEN - 1); 940 goto done_errmsg; 941 } 942 } 943 944 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 945 if (error == ENOENT) 946 osreldt = 0; 947 else if (error != 0) 948 goto done_free; 949 else { 950 if (flags & JAIL_UPDATE) { 951 error = EINVAL; 952 vfs_opterror(opts, 953 "osreldate cannot be changed after creation"); 954 goto done_errmsg; 955 } 956 if (osreldt == 0) { 957 error = EINVAL; 958 vfs_opterror(opts, "osreldate cannot be 0"); 959 goto done_errmsg; 960 } 961 } 962 963 fullpath_disabled = 0; 964 root = NULL; 965 error = vfs_getopt(opts, "path", (void **)&path, &len); 966 if (error == ENOENT) 967 path = NULL; 968 else if (error != 0) 969 goto done_free; 970 else { 971 if (flags & JAIL_UPDATE) { 972 error = EINVAL; 973 vfs_opterror(opts, 974 "path cannot be changed after creation"); 975 goto done_errmsg; 976 } 977 if (len == 0 || path[len - 1] != '\0') { 978 error = EINVAL; 979 goto done_free; 980 } 981 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 982 path, td); 983 error = namei(&nd); 984 if (error) 985 goto done_free; 986 root = nd.ni_vp; 987 NDFREE(&nd, NDF_ONLY_PNBUF); 988 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 989 strlcpy(g_path, path, MAXPATHLEN); 990 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 991 if (error == 0) 992 path = g_path; 993 else if (error == ENODEV) { 994 /* proceed if sysctl debug.disablefullpath == 1 */ 995 fullpath_disabled = 1; 996 if (len < 2 || (len == 2 && path[0] == '/')) 997 path = NULL; 998 } else { 999 /* exit on other errors */ 1000 goto done_free; 1001 } 1002 if (root->v_type != VDIR) { 1003 error = ENOTDIR; 1004 vput(root); 1005 goto done_free; 1006 } 1007 VOP_UNLOCK(root, 0); 1008 if (fullpath_disabled) { 1009 /* Leave room for a real-root full pathname. */ 1010 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 1011 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 1012 error = ENAMETOOLONG; 1013 vrele(root); 1014 goto done_free; 1015 } 1016 } 1017 } 1018 1019 /* 1020 * Find the specified jail, or at least its parent. 1021 * This abuses the file error codes ENOENT and EEXIST. 1022 */ 1023 pr = NULL; 1024 ppr = mypr; 1025 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 1026 namelc = strrchr(name, '.'); 1027 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 1028 if (*p != '\0') 1029 jid = 0; 1030 } 1031 sx_xlock(&allprison_lock); 1032 if (jid != 0) { 1033 /* 1034 * See if a requested jid already exists. There is an 1035 * information leak here if the jid exists but is not within 1036 * the caller's jail hierarchy. Jail creators will get EEXIST 1037 * even though they cannot see the jail, and CREATE | UPDATE 1038 * will return ENOENT which is not normally a valid error. 1039 */ 1040 if (jid < 0) { 1041 error = EINVAL; 1042 vfs_opterror(opts, "negative jid"); 1043 goto done_unlock_list; 1044 } 1045 pr = prison_find(jid); 1046 if (pr != NULL) { 1047 ppr = pr->pr_parent; 1048 /* Create: jid must not exist. */ 1049 if (cuflags == JAIL_CREATE) { 1050 mtx_unlock(&pr->pr_mtx); 1051 error = EEXIST; 1052 vfs_opterror(opts, "jail %d already exists", 1053 jid); 1054 goto done_unlock_list; 1055 } 1056 if (!prison_ischild(mypr, pr)) { 1057 mtx_unlock(&pr->pr_mtx); 1058 pr = NULL; 1059 } else if (pr->pr_uref == 0) { 1060 if (!(flags & JAIL_DYING)) { 1061 mtx_unlock(&pr->pr_mtx); 1062 error = ENOENT; 1063 vfs_opterror(opts, "jail %d is dying", 1064 jid); 1065 goto done_unlock_list; 1066 } else if ((flags & JAIL_ATTACH) || 1067 (pr_flags & PR_PERSIST)) { 1068 /* 1069 * A dying jail might be resurrected 1070 * (via attach or persist), but first 1071 * it must determine if another jail 1072 * has claimed its name. Accomplish 1073 * this by implicitly re-setting the 1074 * name. 1075 */ 1076 if (name == NULL) 1077 name = prison_name(mypr, pr); 1078 } 1079 } 1080 } 1081 if (pr == NULL) { 1082 /* Update: jid must exist. */ 1083 if (cuflags == JAIL_UPDATE) { 1084 error = ENOENT; 1085 vfs_opterror(opts, "jail %d not found", jid); 1086 goto done_unlock_list; 1087 } 1088 } 1089 } 1090 /* 1091 * If the caller provided a name, look for a jail by that name. 1092 * This has different semantics for creates and updates keyed by jid 1093 * (where the name must not already exist in a different jail), 1094 * and updates keyed by the name itself (where the name must exist 1095 * because that is the jail being updated). 1096 */ 1097 namelc = NULL; 1098 if (name != NULL) { 1099 namelc = strrchr(name, '.'); 1100 if (namelc == NULL) 1101 namelc = name; 1102 else { 1103 /* 1104 * This is a hierarchical name. Split it into the 1105 * parent and child names, and make sure the parent 1106 * exists or matches an already found jail. 1107 */ 1108 if (pr != NULL) { 1109 if (strncmp(name, ppr->pr_name, namelc - name) 1110 || ppr->pr_name[namelc - name] != '\0') { 1111 mtx_unlock(&pr->pr_mtx); 1112 error = EINVAL; 1113 vfs_opterror(opts, 1114 "cannot change jail's parent"); 1115 goto done_unlock_list; 1116 } 1117 } else { 1118 *namelc = '\0'; 1119 ppr = prison_find_name(mypr, name); 1120 if (ppr == NULL) { 1121 error = ENOENT; 1122 vfs_opterror(opts, 1123 "jail \"%s\" not found", name); 1124 goto done_unlock_list; 1125 } 1126 mtx_unlock(&ppr->pr_mtx); 1127 *namelc = '.'; 1128 } 1129 namelc++; 1130 } 1131 if (namelc[0] != '\0') { 1132 pnamelen = 1133 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1134 name_again: 1135 deadpr = NULL; 1136 FOREACH_PRISON_CHILD(ppr, tpr) { 1137 if (tpr != pr && tpr->pr_ref > 0 && 1138 !strcmp(tpr->pr_name + pnamelen, namelc)) { 1139 if (pr == NULL && 1140 cuflags != JAIL_CREATE) { 1141 mtx_lock(&tpr->pr_mtx); 1142 if (tpr->pr_ref > 0) { 1143 /* 1144 * Use this jail 1145 * for updates. 1146 */ 1147 if (tpr->pr_uref > 0) { 1148 pr = tpr; 1149 break; 1150 } 1151 deadpr = tpr; 1152 } 1153 mtx_unlock(&tpr->pr_mtx); 1154 } else if (tpr->pr_uref > 0) { 1155 /* 1156 * Create, or update(jid): 1157 * name must not exist in an 1158 * active sibling jail. 1159 */ 1160 error = EEXIST; 1161 if (pr != NULL) 1162 mtx_unlock(&pr->pr_mtx); 1163 vfs_opterror(opts, 1164 "jail \"%s\" already exists", 1165 name); 1166 goto done_unlock_list; 1167 } 1168 } 1169 } 1170 /* If no active jail is found, use a dying one. */ 1171 if (deadpr != NULL && pr == NULL) { 1172 if (flags & JAIL_DYING) { 1173 mtx_lock(&deadpr->pr_mtx); 1174 if (deadpr->pr_ref == 0) { 1175 mtx_unlock(&deadpr->pr_mtx); 1176 goto name_again; 1177 } 1178 pr = deadpr; 1179 } else if (cuflags == JAIL_UPDATE) { 1180 error = ENOENT; 1181 vfs_opterror(opts, 1182 "jail \"%s\" is dying", name); 1183 goto done_unlock_list; 1184 } 1185 } 1186 /* Update: name must exist if no jid. */ 1187 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1188 error = ENOENT; 1189 vfs_opterror(opts, "jail \"%s\" not found", 1190 name); 1191 goto done_unlock_list; 1192 } 1193 } 1194 } 1195 /* Update: must provide a jid or name. */ 1196 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1197 error = ENOENT; 1198 vfs_opterror(opts, "update specified no jail"); 1199 goto done_unlock_list; 1200 } 1201 1202 /* If there's no prison to update, create a new one and link it in. */ 1203 if (pr == NULL) { 1204 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1205 if (tpr->pr_childcount >= tpr->pr_childmax) { 1206 error = EPERM; 1207 vfs_opterror(opts, "prison limit exceeded"); 1208 goto done_unlock_list; 1209 } 1210 created = 1; 1211 mtx_lock(&ppr->pr_mtx); 1212 if (ppr->pr_ref == 0) { 1213 mtx_unlock(&ppr->pr_mtx); 1214 error = ENOENT; 1215 vfs_opterror(opts, "jail \"%s\" not found", 1216 prison_name(mypr, ppr)); 1217 goto done_unlock_list; 1218 } 1219 ppr->pr_ref++; 1220 ppr->pr_uref++; 1221 mtx_unlock(&ppr->pr_mtx); 1222 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1223 if (jid == 0) { 1224 /* Find the next free jid. */ 1225 jid = lastprid + 1; 1226 findnext: 1227 if (jid == JAIL_MAX) 1228 jid = 1; 1229 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1230 if (tpr->pr_id < jid) 1231 continue; 1232 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1233 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1234 break; 1235 } 1236 if (jid == lastprid) { 1237 error = EAGAIN; 1238 vfs_opterror(opts, 1239 "no available jail IDs"); 1240 free(pr, M_PRISON); 1241 prison_deref(ppr, PD_DEREF | 1242 PD_DEUREF | PD_LIST_XLOCKED); 1243 goto done_releroot; 1244 } 1245 jid++; 1246 goto findnext; 1247 } 1248 lastprid = jid; 1249 } else { 1250 /* 1251 * The jail already has a jid (that did not yet exist), 1252 * so just find where to insert it. 1253 */ 1254 TAILQ_FOREACH(tpr, &allprison, pr_list) 1255 if (tpr->pr_id >= jid) { 1256 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1257 break; 1258 } 1259 } 1260 if (tpr == NULL) 1261 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1262 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1263 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1264 tpr->pr_childcount++; 1265 1266 pr->pr_parent = ppr; 1267 pr->pr_id = jid; 1268 1269 /* Set some default values, and inherit some from the parent. */ 1270 if (namelc == NULL) 1271 namelc = ""; 1272 if (path == NULL) { 1273 path = "/"; 1274 root = mypr->pr_root; 1275 vref(root); 1276 } 1277 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1278 pr->pr_flags |= PR_HOST; 1279 #if defined(INET) || defined(INET6) 1280 #ifdef VIMAGE 1281 if (!(pr_flags & PR_VNET)) 1282 #endif 1283 { 1284 #ifdef INET 1285 if (!(ch_flags & PR_IP4_USER)) 1286 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1287 else if (!(pr_flags & PR_IP4_USER)) { 1288 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1289 if (ppr->pr_ip4 != NULL) { 1290 pr->pr_ip4s = ppr->pr_ip4s; 1291 pr->pr_ip4 = malloc(pr->pr_ip4s * 1292 sizeof(struct in_addr), M_PRISON, 1293 M_WAITOK); 1294 bcopy(ppr->pr_ip4, pr->pr_ip4, 1295 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1296 } 1297 } 1298 #endif 1299 #ifdef INET6 1300 if (!(ch_flags & PR_IP6_USER)) 1301 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1302 else if (!(pr_flags & PR_IP6_USER)) { 1303 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1304 if (ppr->pr_ip6 != NULL) { 1305 pr->pr_ip6s = ppr->pr_ip6s; 1306 pr->pr_ip6 = malloc(pr->pr_ip6s * 1307 sizeof(struct in6_addr), M_PRISON, 1308 M_WAITOK); 1309 bcopy(ppr->pr_ip6, pr->pr_ip6, 1310 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1311 } 1312 } 1313 #endif 1314 } 1315 #endif 1316 /* Source address selection is always on by default. */ 1317 pr->pr_flags |= _PR_IP_SADDRSEL; 1318 1319 pr->pr_securelevel = ppr->pr_securelevel; 1320 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1321 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1322 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1323 1324 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1325 if (osrelstr == NULL) 1326 strcpy(pr->pr_osrelease, ppr->pr_osrelease); 1327 else 1328 strcpy(pr->pr_osrelease, osrelstr); 1329 1330 LIST_INIT(&pr->pr_children); 1331 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1332 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1333 1334 #ifdef VIMAGE 1335 /* Allocate a new vnet if specified. */ 1336 pr->pr_vnet = (pr_flags & PR_VNET) 1337 ? vnet_alloc() : ppr->pr_vnet; 1338 #endif 1339 /* 1340 * Allocate a dedicated cpuset for each jail. 1341 * Unlike other initial settings, this may return an erorr. 1342 */ 1343 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1344 if (error) { 1345 prison_deref(pr, PD_LIST_XLOCKED); 1346 goto done_releroot; 1347 } 1348 1349 mtx_lock(&pr->pr_mtx); 1350 /* 1351 * New prisons do not yet have a reference, because we do not 1352 * want others to see the incomplete prison once the 1353 * allprison_lock is downgraded. 1354 */ 1355 } else { 1356 created = 0; 1357 /* 1358 * Grab a reference for existing prisons, to ensure they 1359 * continue to exist for the duration of the call. 1360 */ 1361 pr->pr_ref++; 1362 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1363 if ((pr->pr_flags & PR_VNET) && 1364 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1365 error = EINVAL; 1366 vfs_opterror(opts, 1367 "vnet jails cannot have IP address restrictions"); 1368 goto done_deref_locked; 1369 } 1370 #endif 1371 #ifdef INET 1372 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1373 error = EINVAL; 1374 vfs_opterror(opts, 1375 "ip4 cannot be changed after creation"); 1376 goto done_deref_locked; 1377 } 1378 #endif 1379 #ifdef INET6 1380 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1381 error = EINVAL; 1382 vfs_opterror(opts, 1383 "ip6 cannot be changed after creation"); 1384 goto done_deref_locked; 1385 } 1386 #endif 1387 } 1388 1389 /* Do final error checking before setting anything. */ 1390 if (gotslevel) { 1391 if (slevel < ppr->pr_securelevel) { 1392 error = EPERM; 1393 goto done_deref_locked; 1394 } 1395 } 1396 if (gotchildmax) { 1397 if (childmax >= ppr->pr_childmax) { 1398 error = EPERM; 1399 goto done_deref_locked; 1400 } 1401 } 1402 if (gotenforce) { 1403 if (enforce < ppr->pr_enforce_statfs) { 1404 error = EPERM; 1405 goto done_deref_locked; 1406 } 1407 } 1408 if (gotrsnum) { 1409 /* 1410 * devfs_rsnum is a uint16_t 1411 */ 1412 if (rsnum < 0 || rsnum > 65535) { 1413 error = EINVAL; 1414 goto done_deref_locked; 1415 } 1416 /* 1417 * Nested jails always inherit parent's devfs ruleset 1418 */ 1419 if (jailed(td->td_ucred)) { 1420 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1421 error = EPERM; 1422 goto done_deref_locked; 1423 } else 1424 rsnum = ppr->pr_devfs_rsnum; 1425 } 1426 } 1427 #ifdef INET 1428 if (ip4s > 0) { 1429 if (ppr->pr_flags & PR_IP4) { 1430 /* 1431 * Make sure the new set of IP addresses is a 1432 * subset of the parent's list. Don't worry 1433 * about the parent being unlocked, as any 1434 * setting is done with allprison_lock held. 1435 */ 1436 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1437 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1438 break; 1439 if (ij == ppr->pr_ip4s) { 1440 error = EPERM; 1441 goto done_deref_locked; 1442 } 1443 if (ip4s > 1) { 1444 for (ii = ij = 1; ii < ip4s; ii++) { 1445 if (ip4[ii].s_addr == 1446 ppr->pr_ip4[0].s_addr) 1447 continue; 1448 for (; ij < ppr->pr_ip4s; ij++) 1449 if (ip4[ii].s_addr == 1450 ppr->pr_ip4[ij].s_addr) 1451 break; 1452 if (ij == ppr->pr_ip4s) 1453 break; 1454 } 1455 if (ij == ppr->pr_ip4s) { 1456 error = EPERM; 1457 goto done_deref_locked; 1458 } 1459 } 1460 } 1461 /* 1462 * Check for conflicting IP addresses. We permit them 1463 * if there is no more than one IP on each jail. If 1464 * there is a duplicate on a jail with more than one 1465 * IP stop checking and return error. 1466 */ 1467 tppr = ppr; 1468 #ifdef VIMAGE 1469 for (; tppr != &prison0; tppr = tppr->pr_parent) 1470 if (tppr->pr_flags & PR_VNET) 1471 break; 1472 #endif 1473 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1474 if (tpr == pr || 1475 #ifdef VIMAGE 1476 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1477 #endif 1478 tpr->pr_uref == 0) { 1479 descend = 0; 1480 continue; 1481 } 1482 if (!(tpr->pr_flags & PR_IP4_USER)) 1483 continue; 1484 descend = 0; 1485 if (tpr->pr_ip4 == NULL || 1486 (ip4s == 1 && tpr->pr_ip4s == 1)) 1487 continue; 1488 for (ii = 0; ii < ip4s; ii++) { 1489 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1490 error = EADDRINUSE; 1491 vfs_opterror(opts, 1492 "IPv4 addresses clash"); 1493 goto done_deref_locked; 1494 } 1495 } 1496 } 1497 } 1498 #endif 1499 #ifdef INET6 1500 if (ip6s > 0) { 1501 if (ppr->pr_flags & PR_IP6) { 1502 /* 1503 * Make sure the new set of IP addresses is a 1504 * subset of the parent's list. 1505 */ 1506 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1507 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1508 &ppr->pr_ip6[ij])) 1509 break; 1510 if (ij == ppr->pr_ip6s) { 1511 error = EPERM; 1512 goto done_deref_locked; 1513 } 1514 if (ip6s > 1) { 1515 for (ii = ij = 1; ii < ip6s; ii++) { 1516 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1517 &ppr->pr_ip6[0])) 1518 continue; 1519 for (; ij < ppr->pr_ip6s; ij++) 1520 if (IN6_ARE_ADDR_EQUAL( 1521 &ip6[ii], &ppr->pr_ip6[ij])) 1522 break; 1523 if (ij == ppr->pr_ip6s) 1524 break; 1525 } 1526 if (ij == ppr->pr_ip6s) { 1527 error = EPERM; 1528 goto done_deref_locked; 1529 } 1530 } 1531 } 1532 /* Check for conflicting IP addresses. */ 1533 tppr = ppr; 1534 #ifdef VIMAGE 1535 for (; tppr != &prison0; tppr = tppr->pr_parent) 1536 if (tppr->pr_flags & PR_VNET) 1537 break; 1538 #endif 1539 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1540 if (tpr == pr || 1541 #ifdef VIMAGE 1542 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1543 #endif 1544 tpr->pr_uref == 0) { 1545 descend = 0; 1546 continue; 1547 } 1548 if (!(tpr->pr_flags & PR_IP6_USER)) 1549 continue; 1550 descend = 0; 1551 if (tpr->pr_ip6 == NULL || 1552 (ip6s == 1 && tpr->pr_ip6s == 1)) 1553 continue; 1554 for (ii = 0; ii < ip6s; ii++) { 1555 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1556 error = EADDRINUSE; 1557 vfs_opterror(opts, 1558 "IPv6 addresses clash"); 1559 goto done_deref_locked; 1560 } 1561 } 1562 } 1563 } 1564 #endif 1565 onamelen = namelen = 0; 1566 if (namelc != NULL) { 1567 /* Give a default name of the jid. Also allow the name to be 1568 * explicitly the jid - but not any other number, and only in 1569 * normal form (no leading zero/etc). 1570 */ 1571 if (namelc[0] == '\0') 1572 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1573 else if ((strtoul(namelc, &p, 10) != jid || 1574 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1575 error = EINVAL; 1576 vfs_opterror(opts, 1577 "name cannot be numeric (unless it is the jid)"); 1578 goto done_deref_locked; 1579 } 1580 /* 1581 * Make sure the name isn't too long for the prison or its 1582 * children. 1583 */ 1584 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1585 onamelen = strlen(pr->pr_name + pnamelen); 1586 namelen = strlen(namelc); 1587 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1588 error = ENAMETOOLONG; 1589 goto done_deref_locked; 1590 } 1591 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1592 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1593 sizeof(pr->pr_name)) { 1594 error = ENAMETOOLONG; 1595 goto done_deref_locked; 1596 } 1597 } 1598 } 1599 if (pr_allow & ~ppr->pr_allow) { 1600 error = EPERM; 1601 goto done_deref_locked; 1602 } 1603 1604 /* 1605 * Let modules check their parameters. This requires unlocking and 1606 * then re-locking the prison, but this is still a valid state as long 1607 * as allprison_lock remains xlocked. 1608 */ 1609 mtx_unlock(&pr->pr_mtx); 1610 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1611 if (error != 0) { 1612 prison_deref(pr, created 1613 ? PD_LIST_XLOCKED 1614 : PD_DEREF | PD_LIST_XLOCKED); 1615 goto done_releroot; 1616 } 1617 mtx_lock(&pr->pr_mtx); 1618 1619 /* At this point, all valid parameters should have been noted. */ 1620 TAILQ_FOREACH(opt, opts, link) { 1621 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1622 error = EINVAL; 1623 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1624 goto done_deref_locked; 1625 } 1626 } 1627 1628 /* Set the parameters of the prison. */ 1629 #ifdef INET 1630 redo_ip4 = 0; 1631 if (pr_flags & PR_IP4_USER) { 1632 pr->pr_flags |= PR_IP4; 1633 free(pr->pr_ip4, M_PRISON); 1634 pr->pr_ip4s = ip4s; 1635 pr->pr_ip4 = ip4; 1636 ip4 = NULL; 1637 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1638 #ifdef VIMAGE 1639 if (tpr->pr_flags & PR_VNET) { 1640 descend = 0; 1641 continue; 1642 } 1643 #endif 1644 if (prison_restrict_ip4(tpr, NULL)) { 1645 redo_ip4 = 1; 1646 descend = 0; 1647 } 1648 } 1649 } 1650 #endif 1651 #ifdef INET6 1652 redo_ip6 = 0; 1653 if (pr_flags & PR_IP6_USER) { 1654 pr->pr_flags |= PR_IP6; 1655 free(pr->pr_ip6, M_PRISON); 1656 pr->pr_ip6s = ip6s; 1657 pr->pr_ip6 = ip6; 1658 ip6 = NULL; 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_ip6(tpr, NULL)) { 1667 redo_ip6 = 1; 1668 descend = 0; 1669 } 1670 } 1671 } 1672 #endif 1673 if (gotslevel) { 1674 pr->pr_securelevel = slevel; 1675 /* Set all child jails to be at least this level. */ 1676 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1677 if (tpr->pr_securelevel < slevel) 1678 tpr->pr_securelevel = slevel; 1679 } 1680 if (gotchildmax) { 1681 pr->pr_childmax = childmax; 1682 /* Set all child jails to under this limit. */ 1683 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1684 if (tpr->pr_childmax > childmax - level) 1685 tpr->pr_childmax = childmax > level 1686 ? childmax - level : 0; 1687 } 1688 if (gotenforce) { 1689 pr->pr_enforce_statfs = enforce; 1690 /* Pass this restriction on to the children. */ 1691 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1692 if (tpr->pr_enforce_statfs < enforce) 1693 tpr->pr_enforce_statfs = enforce; 1694 } 1695 if (gotrsnum) { 1696 pr->pr_devfs_rsnum = rsnum; 1697 /* Pass this restriction on to the children. */ 1698 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1699 tpr->pr_devfs_rsnum = rsnum; 1700 } 1701 if (namelc != NULL) { 1702 if (ppr == &prison0) 1703 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1704 else 1705 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1706 ppr->pr_name, namelc); 1707 /* Change this component of child names. */ 1708 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1709 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1710 strlen(tpr->pr_name + onamelen) + 1); 1711 bcopy(pr->pr_name, tpr->pr_name, namelen); 1712 } 1713 } 1714 if (path != NULL) { 1715 /* Try to keep a real-rooted full pathname. */ 1716 if (fullpath_disabled && path[0] == '/' && 1717 strcmp(mypr->pr_path, "/")) 1718 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1719 mypr->pr_path, path); 1720 else 1721 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1722 pr->pr_root = root; 1723 } 1724 if (PR_HOST & ch_flags & ~pr_flags) { 1725 if (pr->pr_flags & PR_HOST) { 1726 /* 1727 * Copy the parent's host info. As with pr_ip4 above, 1728 * the lack of a lock on the parent is not a problem; 1729 * it is always set with allprison_lock at least 1730 * shared, and is held exclusively here. 1731 */ 1732 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1733 sizeof(pr->pr_hostname)); 1734 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1735 sizeof(pr->pr_domainname)); 1736 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1737 sizeof(pr->pr_hostuuid)); 1738 pr->pr_hostid = pr->pr_parent->pr_hostid; 1739 } 1740 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1741 /* Set this prison, and any descendants without PR_HOST. */ 1742 if (host != NULL) 1743 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1744 if (domain != NULL) 1745 strlcpy(pr->pr_domainname, domain, 1746 sizeof(pr->pr_domainname)); 1747 if (uuid != NULL) 1748 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1749 if (gothid) 1750 pr->pr_hostid = hid; 1751 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1752 if (tpr->pr_flags & PR_HOST) 1753 descend = 0; 1754 else { 1755 if (host != NULL) 1756 strlcpy(tpr->pr_hostname, 1757 pr->pr_hostname, 1758 sizeof(tpr->pr_hostname)); 1759 if (domain != NULL) 1760 strlcpy(tpr->pr_domainname, 1761 pr->pr_domainname, 1762 sizeof(tpr->pr_domainname)); 1763 if (uuid != NULL) 1764 strlcpy(tpr->pr_hostuuid, 1765 pr->pr_hostuuid, 1766 sizeof(tpr->pr_hostuuid)); 1767 if (gothid) 1768 tpr->pr_hostid = hid; 1769 } 1770 } 1771 } 1772 if ((tallow = ch_allow & ~pr_allow)) { 1773 /* Clear allow bits in all children. */ 1774 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1775 tpr->pr_allow &= ~tallow; 1776 } 1777 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1778 /* 1779 * Persistent prisons get an extra reference, and prisons losing their 1780 * persist flag lose that reference. Only do this for existing prisons 1781 * for now, so new ones will remain unseen until after the module 1782 * handlers have completed. 1783 */ 1784 born = pr->pr_uref == 0; 1785 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1786 if (pr_flags & PR_PERSIST) { 1787 pr->pr_ref++; 1788 pr->pr_uref++; 1789 } else { 1790 pr->pr_ref--; 1791 pr->pr_uref--; 1792 } 1793 } 1794 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1795 mtx_unlock(&pr->pr_mtx); 1796 1797 #ifdef RACCT 1798 if (racct_enable && created) 1799 prison_racct_attach(pr); 1800 #endif 1801 1802 /* Locks may have prevented a complete restriction of child IP 1803 * addresses. If so, allocate some more memory and try again. 1804 */ 1805 #ifdef INET 1806 while (redo_ip4) { 1807 ip4s = pr->pr_ip4s; 1808 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1809 mtx_lock(&pr->pr_mtx); 1810 redo_ip4 = 0; 1811 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1812 #ifdef VIMAGE 1813 if (tpr->pr_flags & PR_VNET) { 1814 descend = 0; 1815 continue; 1816 } 1817 #endif 1818 if (prison_restrict_ip4(tpr, ip4)) { 1819 if (ip4 != NULL) 1820 ip4 = NULL; 1821 else 1822 redo_ip4 = 1; 1823 } 1824 } 1825 mtx_unlock(&pr->pr_mtx); 1826 } 1827 #endif 1828 #ifdef INET6 1829 while (redo_ip6) { 1830 ip6s = pr->pr_ip6s; 1831 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1832 mtx_lock(&pr->pr_mtx); 1833 redo_ip6 = 0; 1834 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1835 #ifdef VIMAGE 1836 if (tpr->pr_flags & PR_VNET) { 1837 descend = 0; 1838 continue; 1839 } 1840 #endif 1841 if (prison_restrict_ip6(tpr, ip6)) { 1842 if (ip6 != NULL) 1843 ip6 = NULL; 1844 else 1845 redo_ip6 = 1; 1846 } 1847 } 1848 mtx_unlock(&pr->pr_mtx); 1849 } 1850 #endif 1851 1852 /* Let the modules do their work. */ 1853 sx_downgrade(&allprison_lock); 1854 if (born) { 1855 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1856 if (error) { 1857 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1858 prison_deref(pr, created 1859 ? PD_LIST_SLOCKED 1860 : PD_DEREF | PD_LIST_SLOCKED); 1861 goto done_errmsg; 1862 } 1863 } 1864 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1865 if (error) { 1866 if (born) 1867 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1868 prison_deref(pr, created 1869 ? PD_LIST_SLOCKED 1870 : PD_DEREF | PD_LIST_SLOCKED); 1871 goto done_errmsg; 1872 } 1873 1874 /* Attach this process to the prison if requested. */ 1875 if (flags & JAIL_ATTACH) { 1876 mtx_lock(&pr->pr_mtx); 1877 error = do_jail_attach(td, pr); 1878 if (error) { 1879 vfs_opterror(opts, "attach failed"); 1880 if (!created) 1881 prison_deref(pr, PD_DEREF); 1882 goto done_errmsg; 1883 } 1884 } 1885 1886 #ifdef RACCT 1887 if (racct_enable && !created) { 1888 if (!(flags & JAIL_ATTACH)) 1889 sx_sunlock(&allprison_lock); 1890 prison_racct_modify(pr); 1891 if (!(flags & JAIL_ATTACH)) 1892 sx_slock(&allprison_lock); 1893 } 1894 #endif 1895 1896 td->td_retval[0] = pr->pr_id; 1897 1898 /* 1899 * Now that it is all there, drop the temporary reference from existing 1900 * prisons. Or add a reference to newly created persistent prisons 1901 * (which was not done earlier so that the prison would not be publicly 1902 * visible). 1903 */ 1904 if (!created) { 1905 prison_deref(pr, (flags & JAIL_ATTACH) 1906 ? PD_DEREF 1907 : PD_DEREF | PD_LIST_SLOCKED); 1908 } else { 1909 if (pr_flags & PR_PERSIST) { 1910 mtx_lock(&pr->pr_mtx); 1911 pr->pr_ref++; 1912 pr->pr_uref++; 1913 mtx_unlock(&pr->pr_mtx); 1914 } 1915 if (!(flags & JAIL_ATTACH)) 1916 sx_sunlock(&allprison_lock); 1917 } 1918 1919 goto done_free; 1920 1921 done_deref_locked: 1922 prison_deref(pr, created 1923 ? PD_LOCKED | PD_LIST_XLOCKED 1924 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1925 goto done_releroot; 1926 done_unlock_list: 1927 sx_xunlock(&allprison_lock); 1928 done_releroot: 1929 if (root != NULL) 1930 vrele(root); 1931 done_errmsg: 1932 if (error) { 1933 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 1934 &errmsg_len) == 0 && errmsg_len > 0) { 1935 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1936 if (optuio->uio_segflg == UIO_SYSSPACE) 1937 bcopy(errmsg, 1938 optuio->uio_iov[errmsg_pos].iov_base, 1939 errmsg_len); 1940 else 1941 copyout(errmsg, 1942 optuio->uio_iov[errmsg_pos].iov_base, 1943 errmsg_len); 1944 } 1945 } 1946 done_free: 1947 #ifdef INET 1948 free(ip4, M_PRISON); 1949 #endif 1950 #ifdef INET6 1951 free(ip6, M_PRISON); 1952 #endif 1953 if (g_path != NULL) 1954 free(g_path, M_TEMP); 1955 vfs_freeopts(opts); 1956 return (error); 1957 } 1958 1959 1960 /* 1961 * struct jail_get_args { 1962 * struct iovec *iovp; 1963 * unsigned int iovcnt; 1964 * int flags; 1965 * }; 1966 */ 1967 int 1968 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1969 { 1970 struct uio *auio; 1971 int error; 1972 1973 /* Check that we have an even number of iovecs. */ 1974 if (uap->iovcnt & 1) 1975 return (EINVAL); 1976 1977 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1978 if (error) 1979 return (error); 1980 error = kern_jail_get(td, auio, uap->flags); 1981 if (error == 0) 1982 error = copyout(auio->uio_iov, uap->iovp, 1983 uap->iovcnt * sizeof (struct iovec)); 1984 free(auio, M_IOV); 1985 return (error); 1986 } 1987 1988 int 1989 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1990 { 1991 struct prison *pr, *mypr; 1992 struct vfsopt *opt; 1993 struct vfsoptlist *opts; 1994 char *errmsg, *name; 1995 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1996 1997 if (flags & ~JAIL_GET_MASK) 1998 return (EINVAL); 1999 2000 /* Get the parameter list. */ 2001 error = vfs_buildopts(optuio, &opts); 2002 if (error) 2003 return (error); 2004 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 2005 mypr = td->td_ucred->cr_prison; 2006 2007 /* 2008 * Find the prison specified by one of: lastjid, jid, name. 2009 */ 2010 sx_slock(&allprison_lock); 2011 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 2012 if (error == 0) { 2013 TAILQ_FOREACH(pr, &allprison, pr_list) { 2014 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 2015 mtx_lock(&pr->pr_mtx); 2016 if (pr->pr_ref > 0 && 2017 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 2018 break; 2019 mtx_unlock(&pr->pr_mtx); 2020 } 2021 } 2022 if (pr != NULL) 2023 goto found_prison; 2024 error = ENOENT; 2025 vfs_opterror(opts, "no jail after %d", jid); 2026 goto done_unlock_list; 2027 } else if (error != ENOENT) 2028 goto done_unlock_list; 2029 2030 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 2031 if (error == 0) { 2032 if (jid != 0) { 2033 pr = prison_find_child(mypr, jid); 2034 if (pr != NULL) { 2035 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2036 mtx_unlock(&pr->pr_mtx); 2037 error = ENOENT; 2038 vfs_opterror(opts, "jail %d is dying", 2039 jid); 2040 goto done_unlock_list; 2041 } 2042 goto found_prison; 2043 } 2044 error = ENOENT; 2045 vfs_opterror(opts, "jail %d not found", jid); 2046 goto done_unlock_list; 2047 } 2048 } else if (error != ENOENT) 2049 goto done_unlock_list; 2050 2051 error = vfs_getopt(opts, "name", (void **)&name, &len); 2052 if (error == 0) { 2053 if (len == 0 || name[len - 1] != '\0') { 2054 error = EINVAL; 2055 goto done_unlock_list; 2056 } 2057 pr = prison_find_name(mypr, name); 2058 if (pr != NULL) { 2059 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2060 mtx_unlock(&pr->pr_mtx); 2061 error = ENOENT; 2062 vfs_opterror(opts, "jail \"%s\" is dying", 2063 name); 2064 goto done_unlock_list; 2065 } 2066 goto found_prison; 2067 } 2068 error = ENOENT; 2069 vfs_opterror(opts, "jail \"%s\" not found", name); 2070 goto done_unlock_list; 2071 } else if (error != ENOENT) 2072 goto done_unlock_list; 2073 2074 vfs_opterror(opts, "no jail specified"); 2075 error = ENOENT; 2076 goto done_unlock_list; 2077 2078 found_prison: 2079 /* Get the parameters of the prison. */ 2080 pr->pr_ref++; 2081 locked = PD_LOCKED; 2082 td->td_retval[0] = pr->pr_id; 2083 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2084 if (error != 0 && error != ENOENT) 2085 goto done_deref; 2086 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2087 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2088 if (error != 0 && error != ENOENT) 2089 goto done_deref; 2090 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2091 if (error != 0 && error != ENOENT) 2092 goto done_deref; 2093 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2094 sizeof(pr->pr_cpuset->cs_id)); 2095 if (error != 0 && error != ENOENT) 2096 goto done_deref; 2097 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2098 if (error != 0 && error != ENOENT) 2099 goto done_deref; 2100 #ifdef INET 2101 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2102 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2103 if (error != 0 && error != ENOENT) 2104 goto done_deref; 2105 #endif 2106 #ifdef INET6 2107 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2108 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2109 if (error != 0 && error != ENOENT) 2110 goto done_deref; 2111 #endif 2112 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2113 sizeof(pr->pr_securelevel)); 2114 if (error != 0 && error != ENOENT) 2115 goto done_deref; 2116 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2117 sizeof(pr->pr_childcount)); 2118 if (error != 0 && error != ENOENT) 2119 goto done_deref; 2120 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2121 sizeof(pr->pr_childmax)); 2122 if (error != 0 && error != ENOENT) 2123 goto done_deref; 2124 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2125 if (error != 0 && error != ENOENT) 2126 goto done_deref; 2127 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2128 if (error != 0 && error != ENOENT) 2129 goto done_deref; 2130 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2131 if (error != 0 && error != ENOENT) 2132 goto done_deref; 2133 #ifdef COMPAT_FREEBSD32 2134 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2135 uint32_t hid32 = pr->pr_hostid; 2136 2137 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2138 } else 2139 #endif 2140 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2141 sizeof(pr->pr_hostid)); 2142 if (error != 0 && error != ENOENT) 2143 goto done_deref; 2144 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2145 sizeof(pr->pr_enforce_statfs)); 2146 if (error != 0 && error != ENOENT) 2147 goto done_deref; 2148 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2149 sizeof(pr->pr_devfs_rsnum)); 2150 if (error != 0 && error != ENOENT) 2151 goto done_deref; 2152 for (fi = 0; fi < nitems(pr_flag_names); fi++) { 2153 if (pr_flag_names[fi] == NULL) 2154 continue; 2155 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2156 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2157 if (error != 0 && error != ENOENT) 2158 goto done_deref; 2159 i = !i; 2160 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2161 if (error != 0 && error != ENOENT) 2162 goto done_deref; 2163 } 2164 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) { 2165 i = pr->pr_flags & 2166 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2167 i = pr_flag_jailsys[fi].disable && 2168 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2169 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2170 : JAIL_SYS_INHERIT; 2171 error = 2172 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2173 if (error != 0 && error != ENOENT) 2174 goto done_deref; 2175 } 2176 for (fi = 0; fi < nitems(pr_allow_names); fi++) { 2177 if (pr_allow_names[fi] == NULL) 2178 continue; 2179 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2180 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2181 if (error != 0 && error != ENOENT) 2182 goto done_deref; 2183 i = !i; 2184 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2185 if (error != 0 && error != ENOENT) 2186 goto done_deref; 2187 } 2188 i = (pr->pr_uref == 0); 2189 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2190 if (error != 0 && error != ENOENT) 2191 goto done_deref; 2192 i = !i; 2193 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2194 if (error != 0 && error != ENOENT) 2195 goto done_deref; 2196 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2197 sizeof(pr->pr_osreldate)); 2198 if (error != 0 && error != ENOENT) 2199 goto done_deref; 2200 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2201 if (error != 0 && error != ENOENT) 2202 goto done_deref; 2203 2204 /* Get the module parameters. */ 2205 mtx_unlock(&pr->pr_mtx); 2206 locked = 0; 2207 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2208 if (error) 2209 goto done_deref; 2210 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2211 2212 /* By now, all parameters should have been noted. */ 2213 TAILQ_FOREACH(opt, opts, link) { 2214 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2215 error = EINVAL; 2216 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2217 goto done_errmsg; 2218 } 2219 } 2220 2221 /* Write the fetched parameters back to userspace. */ 2222 error = 0; 2223 TAILQ_FOREACH(opt, opts, link) { 2224 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2225 pos = 2 * opt->pos + 1; 2226 optuio->uio_iov[pos].iov_len = opt->len; 2227 if (opt->value != NULL) { 2228 if (optuio->uio_segflg == UIO_SYSSPACE) { 2229 bcopy(opt->value, 2230 optuio->uio_iov[pos].iov_base, 2231 opt->len); 2232 } else { 2233 error = copyout(opt->value, 2234 optuio->uio_iov[pos].iov_base, 2235 opt->len); 2236 if (error) 2237 break; 2238 } 2239 } 2240 } 2241 } 2242 goto done_errmsg; 2243 2244 done_deref: 2245 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2246 goto done_errmsg; 2247 2248 done_unlock_list: 2249 sx_sunlock(&allprison_lock); 2250 done_errmsg: 2251 if (error && errmsg_pos >= 0) { 2252 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2253 errmsg_pos = 2 * errmsg_pos + 1; 2254 if (errmsg_len > 0) { 2255 if (optuio->uio_segflg == UIO_SYSSPACE) 2256 bcopy(errmsg, 2257 optuio->uio_iov[errmsg_pos].iov_base, 2258 errmsg_len); 2259 else 2260 copyout(errmsg, 2261 optuio->uio_iov[errmsg_pos].iov_base, 2262 errmsg_len); 2263 } 2264 } 2265 vfs_freeopts(opts); 2266 return (error); 2267 } 2268 2269 2270 /* 2271 * struct jail_remove_args { 2272 * int jid; 2273 * }; 2274 */ 2275 int 2276 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2277 { 2278 struct prison *pr, *cpr, *lpr, *tpr; 2279 int descend, error; 2280 2281 error = priv_check(td, PRIV_JAIL_REMOVE); 2282 if (error) 2283 return (error); 2284 2285 sx_xlock(&allprison_lock); 2286 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2287 if (pr == NULL) { 2288 sx_xunlock(&allprison_lock); 2289 return (EINVAL); 2290 } 2291 2292 /* Remove all descendants of this prison, then remove this prison. */ 2293 pr->pr_ref++; 2294 if (!LIST_EMPTY(&pr->pr_children)) { 2295 mtx_unlock(&pr->pr_mtx); 2296 lpr = NULL; 2297 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2298 mtx_lock(&cpr->pr_mtx); 2299 if (cpr->pr_ref > 0) { 2300 tpr = cpr; 2301 cpr->pr_ref++; 2302 } else { 2303 /* Already removed - do not do it again. */ 2304 tpr = NULL; 2305 } 2306 mtx_unlock(&cpr->pr_mtx); 2307 if (lpr != NULL) { 2308 mtx_lock(&lpr->pr_mtx); 2309 prison_remove_one(lpr); 2310 sx_xlock(&allprison_lock); 2311 } 2312 lpr = tpr; 2313 } 2314 if (lpr != NULL) { 2315 mtx_lock(&lpr->pr_mtx); 2316 prison_remove_one(lpr); 2317 sx_xlock(&allprison_lock); 2318 } 2319 mtx_lock(&pr->pr_mtx); 2320 } 2321 prison_remove_one(pr); 2322 return (0); 2323 } 2324 2325 static void 2326 prison_remove_one(struct prison *pr) 2327 { 2328 struct proc *p; 2329 int deuref; 2330 2331 /* If the prison was persistent, it is not anymore. */ 2332 deuref = 0; 2333 if (pr->pr_flags & PR_PERSIST) { 2334 pr->pr_ref--; 2335 deuref = PD_DEUREF; 2336 pr->pr_flags &= ~PR_PERSIST; 2337 } 2338 2339 /* 2340 * jail_remove added a reference. If that's the only one, remove 2341 * the prison now. 2342 */ 2343 KASSERT(pr->pr_ref > 0, 2344 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2345 if (pr->pr_ref == 1) { 2346 prison_deref(pr, 2347 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2348 return; 2349 } 2350 2351 mtx_unlock(&pr->pr_mtx); 2352 sx_xunlock(&allprison_lock); 2353 /* 2354 * Kill all processes unfortunate enough to be attached to this prison. 2355 */ 2356 sx_slock(&allproc_lock); 2357 LIST_FOREACH(p, &allproc, p_list) { 2358 PROC_LOCK(p); 2359 if (p->p_state != PRS_NEW && p->p_ucred && 2360 p->p_ucred->cr_prison == pr) 2361 kern_psignal(p, SIGKILL); 2362 PROC_UNLOCK(p); 2363 } 2364 sx_sunlock(&allproc_lock); 2365 /* Remove the temporary reference added by jail_remove. */ 2366 prison_deref(pr, deuref | PD_DEREF); 2367 } 2368 2369 2370 /* 2371 * struct jail_attach_args { 2372 * int jid; 2373 * }; 2374 */ 2375 int 2376 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2377 { 2378 struct prison *pr; 2379 int error; 2380 2381 error = priv_check(td, PRIV_JAIL_ATTACH); 2382 if (error) 2383 return (error); 2384 2385 /* 2386 * Start with exclusive hold on allprison_lock to ensure that a possible 2387 * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove. 2388 * But then immediately downgrade it since we don't need to stop 2389 * readers. 2390 */ 2391 sx_xlock(&allprison_lock); 2392 sx_downgrade(&allprison_lock); 2393 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2394 if (pr == NULL) { 2395 sx_sunlock(&allprison_lock); 2396 return (EINVAL); 2397 } 2398 2399 /* 2400 * Do not allow a process to attach to a prison that is not 2401 * considered to be "alive". 2402 */ 2403 if (pr->pr_uref == 0) { 2404 mtx_unlock(&pr->pr_mtx); 2405 sx_sunlock(&allprison_lock); 2406 return (EINVAL); 2407 } 2408 2409 return (do_jail_attach(td, pr)); 2410 } 2411 2412 static int 2413 do_jail_attach(struct thread *td, struct prison *pr) 2414 { 2415 struct proc *p; 2416 struct ucred *newcred, *oldcred; 2417 int error; 2418 2419 /* 2420 * XXX: Note that there is a slight race here if two threads 2421 * in the same privileged process attempt to attach to two 2422 * different jails at the same time. It is important for 2423 * user processes not to do this, or they might end up with 2424 * a process root from one prison, but attached to the jail 2425 * of another. 2426 */ 2427 pr->pr_ref++; 2428 pr->pr_uref++; 2429 mtx_unlock(&pr->pr_mtx); 2430 2431 /* Let modules do whatever they need to prepare for attaching. */ 2432 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2433 if (error) { 2434 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2435 return (error); 2436 } 2437 sx_sunlock(&allprison_lock); 2438 2439 /* 2440 * Reparent the newly attached process to this jail. 2441 */ 2442 p = td->td_proc; 2443 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2444 if (error) 2445 goto e_revert_osd; 2446 2447 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2448 if ((error = change_dir(pr->pr_root, td)) != 0) 2449 goto e_unlock; 2450 #ifdef MAC 2451 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2452 goto e_unlock; 2453 #endif 2454 VOP_UNLOCK(pr->pr_root, 0); 2455 if ((error = pwd_chroot(td, pr->pr_root))) 2456 goto e_revert_osd; 2457 2458 newcred = crget(); 2459 PROC_LOCK(p); 2460 oldcred = crcopysafe(p, newcred); 2461 newcred->cr_prison = pr; 2462 proc_set_cred(p, newcred); 2463 setsugid(p); 2464 PROC_UNLOCK(p); 2465 #ifdef RACCT 2466 racct_proc_ucred_changed(p, oldcred, newcred); 2467 #endif 2468 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF); 2469 crfree(oldcred); 2470 return (0); 2471 2472 e_unlock: 2473 VOP_UNLOCK(pr->pr_root, 0); 2474 e_revert_osd: 2475 /* Tell modules this thread is still in its old jail after all. */ 2476 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2477 prison_deref(pr, PD_DEREF | PD_DEUREF); 2478 return (error); 2479 } 2480 2481 2482 /* 2483 * Returns a locked prison instance, or NULL on failure. 2484 */ 2485 struct prison * 2486 prison_find(int prid) 2487 { 2488 struct prison *pr; 2489 2490 sx_assert(&allprison_lock, SX_LOCKED); 2491 TAILQ_FOREACH(pr, &allprison, pr_list) { 2492 if (pr->pr_id == prid) { 2493 mtx_lock(&pr->pr_mtx); 2494 if (pr->pr_ref > 0) 2495 return (pr); 2496 mtx_unlock(&pr->pr_mtx); 2497 } 2498 } 2499 return (NULL); 2500 } 2501 2502 /* 2503 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2504 */ 2505 struct prison * 2506 prison_find_child(struct prison *mypr, int prid) 2507 { 2508 struct prison *pr; 2509 int descend; 2510 2511 sx_assert(&allprison_lock, SX_LOCKED); 2512 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2513 if (pr->pr_id == prid) { 2514 mtx_lock(&pr->pr_mtx); 2515 if (pr->pr_ref > 0) 2516 return (pr); 2517 mtx_unlock(&pr->pr_mtx); 2518 } 2519 } 2520 return (NULL); 2521 } 2522 2523 /* 2524 * Look for the name relative to mypr. Returns a locked prison or NULL. 2525 */ 2526 struct prison * 2527 prison_find_name(struct prison *mypr, const char *name) 2528 { 2529 struct prison *pr, *deadpr; 2530 size_t mylen; 2531 int descend; 2532 2533 sx_assert(&allprison_lock, SX_LOCKED); 2534 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2535 again: 2536 deadpr = NULL; 2537 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2538 if (!strcmp(pr->pr_name + mylen, name)) { 2539 mtx_lock(&pr->pr_mtx); 2540 if (pr->pr_ref > 0) { 2541 if (pr->pr_uref > 0) 2542 return (pr); 2543 deadpr = pr; 2544 } 2545 mtx_unlock(&pr->pr_mtx); 2546 } 2547 } 2548 /* There was no valid prison - perhaps there was a dying one. */ 2549 if (deadpr != NULL) { 2550 mtx_lock(&deadpr->pr_mtx); 2551 if (deadpr->pr_ref == 0) { 2552 mtx_unlock(&deadpr->pr_mtx); 2553 goto again; 2554 } 2555 } 2556 return (deadpr); 2557 } 2558 2559 /* 2560 * See if a prison has the specific flag set. 2561 */ 2562 int 2563 prison_flag(struct ucred *cred, unsigned flag) 2564 { 2565 2566 /* This is an atomic read, so no locking is necessary. */ 2567 return (cred->cr_prison->pr_flags & flag); 2568 } 2569 2570 int 2571 prison_allow(struct ucred *cred, unsigned flag) 2572 { 2573 2574 /* This is an atomic read, so no locking is necessary. */ 2575 return (cred->cr_prison->pr_allow & flag); 2576 } 2577 2578 /* 2579 * Remove a prison reference. If that was the last reference, remove the 2580 * prison itself - but not in this context in case there are locks held. 2581 */ 2582 void 2583 prison_free_locked(struct prison *pr) 2584 { 2585 int ref; 2586 2587 mtx_assert(&pr->pr_mtx, MA_OWNED); 2588 ref = --pr->pr_ref; 2589 mtx_unlock(&pr->pr_mtx); 2590 if (ref == 0) 2591 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2592 } 2593 2594 void 2595 prison_free(struct prison *pr) 2596 { 2597 2598 mtx_lock(&pr->pr_mtx); 2599 prison_free_locked(pr); 2600 } 2601 2602 /* 2603 * Complete a call to either prison_free or prison_proc_free. 2604 */ 2605 static void 2606 prison_complete(void *context, int pending) 2607 { 2608 struct prison *pr = context; 2609 2610 sx_xlock(&allprison_lock); 2611 mtx_lock(&pr->pr_mtx); 2612 prison_deref(pr, pr->pr_uref 2613 ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED 2614 : PD_LOCKED | PD_LIST_XLOCKED); 2615 } 2616 2617 /* 2618 * Remove a prison reference (usually). This internal version assumes no 2619 * mutexes are held, except perhaps the prison itself. If there are no more 2620 * references, release and delist the prison. On completion, the prison lock 2621 * and the allprison lock are both unlocked. 2622 */ 2623 static void 2624 prison_deref(struct prison *pr, int flags) 2625 { 2626 struct prison *ppr, *tpr; 2627 int ref, lasturef; 2628 2629 if (!(flags & PD_LOCKED)) 2630 mtx_lock(&pr->pr_mtx); 2631 for (;;) { 2632 if (flags & PD_DEUREF) { 2633 KASSERT(pr->pr_uref > 0, 2634 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 2635 pr->pr_id)); 2636 pr->pr_uref--; 2637 lasturef = pr->pr_uref == 0; 2638 if (lasturef) 2639 pr->pr_ref++; 2640 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2641 } else 2642 lasturef = 0; 2643 if (flags & PD_DEREF) { 2644 KASSERT(pr->pr_ref > 0, 2645 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 2646 pr->pr_id)); 2647 pr->pr_ref--; 2648 } 2649 ref = pr->pr_ref; 2650 mtx_unlock(&pr->pr_mtx); 2651 2652 /* 2653 * Tell the modules if the last user reference was removed 2654 * (even it sticks around in dying state). 2655 */ 2656 if (lasturef) { 2657 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) { 2658 sx_xlock(&allprison_lock); 2659 flags |= PD_LIST_XLOCKED; 2660 } 2661 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 2662 mtx_lock(&pr->pr_mtx); 2663 ref = --pr->pr_ref; 2664 mtx_unlock(&pr->pr_mtx); 2665 } 2666 2667 /* If the prison still has references, nothing else to do. */ 2668 if (ref > 0) { 2669 if (flags & PD_LIST_SLOCKED) 2670 sx_sunlock(&allprison_lock); 2671 else if (flags & PD_LIST_XLOCKED) 2672 sx_xunlock(&allprison_lock); 2673 return; 2674 } 2675 2676 if (flags & PD_LIST_SLOCKED) { 2677 if (!sx_try_upgrade(&allprison_lock)) { 2678 sx_sunlock(&allprison_lock); 2679 sx_xlock(&allprison_lock); 2680 } 2681 } else if (!(flags & PD_LIST_XLOCKED)) 2682 sx_xlock(&allprison_lock); 2683 2684 TAILQ_REMOVE(&allprison, pr, pr_list); 2685 LIST_REMOVE(pr, pr_sibling); 2686 ppr = pr->pr_parent; 2687 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2688 tpr->pr_childcount--; 2689 sx_xunlock(&allprison_lock); 2690 2691 #ifdef VIMAGE 2692 if (pr->pr_vnet != ppr->pr_vnet) 2693 vnet_destroy(pr->pr_vnet); 2694 #endif 2695 if (pr->pr_root != NULL) 2696 vrele(pr->pr_root); 2697 mtx_destroy(&pr->pr_mtx); 2698 #ifdef INET 2699 free(pr->pr_ip4, M_PRISON); 2700 #endif 2701 #ifdef INET6 2702 free(pr->pr_ip6, M_PRISON); 2703 #endif 2704 if (pr->pr_cpuset != NULL) 2705 cpuset_rel(pr->pr_cpuset); 2706 osd_jail_exit(pr); 2707 #ifdef RACCT 2708 if (racct_enable) 2709 prison_racct_detach(pr); 2710 #endif 2711 free(pr, M_PRISON); 2712 2713 /* Removing a prison frees a reference on its parent. */ 2714 pr = ppr; 2715 mtx_lock(&pr->pr_mtx); 2716 flags = PD_DEREF | PD_DEUREF; 2717 } 2718 } 2719 2720 void 2721 prison_hold_locked(struct prison *pr) 2722 { 2723 2724 mtx_assert(&pr->pr_mtx, MA_OWNED); 2725 KASSERT(pr->pr_ref > 0, 2726 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2727 pr->pr_ref++; 2728 } 2729 2730 void 2731 prison_hold(struct prison *pr) 2732 { 2733 2734 mtx_lock(&pr->pr_mtx); 2735 prison_hold_locked(pr); 2736 mtx_unlock(&pr->pr_mtx); 2737 } 2738 2739 void 2740 prison_proc_hold(struct prison *pr) 2741 { 2742 2743 mtx_lock(&pr->pr_mtx); 2744 KASSERT(pr->pr_uref > 0, 2745 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2746 pr->pr_uref++; 2747 mtx_unlock(&pr->pr_mtx); 2748 } 2749 2750 void 2751 prison_proc_free(struct prison *pr) 2752 { 2753 2754 mtx_lock(&pr->pr_mtx); 2755 KASSERT(pr->pr_uref > 0, 2756 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2757 if (pr->pr_uref > 1) 2758 pr->pr_uref--; 2759 else { 2760 /* 2761 * Don't remove the last user reference in this context, which 2762 * is expected to be a process that is not only locked, but 2763 * also half dead. 2764 */ 2765 pr->pr_ref++; 2766 mtx_unlock(&pr->pr_mtx); 2767 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2768 return; 2769 } 2770 mtx_unlock(&pr->pr_mtx); 2771 } 2772 2773 2774 #ifdef INET 2775 /* 2776 * Restrict a prison's IP address list with its parent's, possibly replacing 2777 * it. Return true if the replacement buffer was used (or would have been). 2778 */ 2779 static int 2780 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2781 { 2782 int ii, ij, used; 2783 struct prison *ppr; 2784 2785 ppr = pr->pr_parent; 2786 if (!(pr->pr_flags & PR_IP4_USER)) { 2787 /* This has no user settings, so just copy the parent's list. */ 2788 if (pr->pr_ip4s < ppr->pr_ip4s) { 2789 /* 2790 * There's no room for the parent's list. Use the 2791 * new list buffer, which is assumed to be big enough 2792 * (if it was passed). If there's no buffer, try to 2793 * allocate one. 2794 */ 2795 used = 1; 2796 if (newip4 == NULL) { 2797 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2798 M_PRISON, M_NOWAIT); 2799 if (newip4 != NULL) 2800 used = 0; 2801 } 2802 if (newip4 != NULL) { 2803 bcopy(ppr->pr_ip4, newip4, 2804 ppr->pr_ip4s * sizeof(*newip4)); 2805 free(pr->pr_ip4, M_PRISON); 2806 pr->pr_ip4 = newip4; 2807 pr->pr_ip4s = ppr->pr_ip4s; 2808 } 2809 return (used); 2810 } 2811 pr->pr_ip4s = ppr->pr_ip4s; 2812 if (pr->pr_ip4s > 0) 2813 bcopy(ppr->pr_ip4, pr->pr_ip4, 2814 pr->pr_ip4s * sizeof(*newip4)); 2815 else if (pr->pr_ip4 != NULL) { 2816 free(pr->pr_ip4, M_PRISON); 2817 pr->pr_ip4 = NULL; 2818 } 2819 } else if (pr->pr_ip4s > 0) { 2820 /* Remove addresses that aren't in the parent. */ 2821 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2822 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2823 break; 2824 if (ij < ppr->pr_ip4s) 2825 ii = 1; 2826 else { 2827 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2828 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2829 ii = 0; 2830 } 2831 for (ij = 1; ii < pr->pr_ip4s; ) { 2832 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2833 ii++; 2834 continue; 2835 } 2836 switch (ij >= ppr->pr_ip4s ? -1 : 2837 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2838 case -1: 2839 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2840 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2841 break; 2842 case 0: 2843 ii++; 2844 ij++; 2845 break; 2846 case 1: 2847 ij++; 2848 break; 2849 } 2850 } 2851 if (pr->pr_ip4s == 0) { 2852 free(pr->pr_ip4, M_PRISON); 2853 pr->pr_ip4 = NULL; 2854 } 2855 } 2856 return (0); 2857 } 2858 2859 /* 2860 * Pass back primary IPv4 address of this jail. 2861 * 2862 * If not restricted return success but do not alter the address. Caller has 2863 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2864 * 2865 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2866 * Address returned in NBO. 2867 */ 2868 int 2869 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2870 { 2871 struct prison *pr; 2872 2873 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2874 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2875 2876 pr = cred->cr_prison; 2877 if (!(pr->pr_flags & PR_IP4)) 2878 return (0); 2879 mtx_lock(&pr->pr_mtx); 2880 if (!(pr->pr_flags & PR_IP4)) { 2881 mtx_unlock(&pr->pr_mtx); 2882 return (0); 2883 } 2884 if (pr->pr_ip4 == NULL) { 2885 mtx_unlock(&pr->pr_mtx); 2886 return (EAFNOSUPPORT); 2887 } 2888 2889 ia->s_addr = pr->pr_ip4[0].s_addr; 2890 mtx_unlock(&pr->pr_mtx); 2891 return (0); 2892 } 2893 2894 /* 2895 * Return 1 if we should do proper source address selection or are not jailed. 2896 * We will return 0 if we should bypass source address selection in favour 2897 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2898 * returned in NBO. 2899 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2900 */ 2901 int 2902 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2903 { 2904 struct prison *pr; 2905 struct in_addr lia; 2906 int error; 2907 2908 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2909 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2910 2911 if (!jailed(cred)) 2912 return (1); 2913 2914 pr = cred->cr_prison; 2915 if (pr->pr_flags & PR_IP4_SADDRSEL) 2916 return (1); 2917 2918 lia.s_addr = INADDR_ANY; 2919 error = prison_get_ip4(cred, &lia); 2920 if (error) 2921 return (error); 2922 if (lia.s_addr == INADDR_ANY) 2923 return (1); 2924 2925 ia->s_addr = lia.s_addr; 2926 return (0); 2927 } 2928 2929 /* 2930 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2931 */ 2932 int 2933 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2934 { 2935 2936 if (pr1 == pr2) 2937 return (1); 2938 2939 /* 2940 * No need to lock since the PR_IP4_USER flag can't be altered for 2941 * existing prisons. 2942 */ 2943 while (pr1 != &prison0 && 2944 #ifdef VIMAGE 2945 !(pr1->pr_flags & PR_VNET) && 2946 #endif 2947 !(pr1->pr_flags & PR_IP4_USER)) 2948 pr1 = pr1->pr_parent; 2949 while (pr2 != &prison0 && 2950 #ifdef VIMAGE 2951 !(pr2->pr_flags & PR_VNET) && 2952 #endif 2953 !(pr2->pr_flags & PR_IP4_USER)) 2954 pr2 = pr2->pr_parent; 2955 return (pr1 == pr2); 2956 } 2957 2958 /* 2959 * Make sure our (source) address is set to something meaningful to this 2960 * jail. 2961 * 2962 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2963 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2964 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2965 */ 2966 int 2967 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2968 { 2969 struct prison *pr; 2970 struct in_addr ia0; 2971 int error; 2972 2973 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2974 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2975 2976 pr = cred->cr_prison; 2977 if (!(pr->pr_flags & PR_IP4)) 2978 return (0); 2979 mtx_lock(&pr->pr_mtx); 2980 if (!(pr->pr_flags & PR_IP4)) { 2981 mtx_unlock(&pr->pr_mtx); 2982 return (0); 2983 } 2984 if (pr->pr_ip4 == NULL) { 2985 mtx_unlock(&pr->pr_mtx); 2986 return (EAFNOSUPPORT); 2987 } 2988 2989 ia0.s_addr = ntohl(ia->s_addr); 2990 if (ia0.s_addr == INADDR_LOOPBACK) { 2991 ia->s_addr = pr->pr_ip4[0].s_addr; 2992 mtx_unlock(&pr->pr_mtx); 2993 return (0); 2994 } 2995 2996 if (ia0.s_addr == INADDR_ANY) { 2997 /* 2998 * In case there is only 1 IPv4 address, bind directly. 2999 */ 3000 if (pr->pr_ip4s == 1) 3001 ia->s_addr = pr->pr_ip4[0].s_addr; 3002 mtx_unlock(&pr->pr_mtx); 3003 return (0); 3004 } 3005 3006 error = _prison_check_ip4(pr, ia); 3007 mtx_unlock(&pr->pr_mtx); 3008 return (error); 3009 } 3010 3011 /* 3012 * Rewrite destination address in case we will connect to loopback address. 3013 * 3014 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 3015 * Address passed in in NBO and returned in NBO. 3016 */ 3017 int 3018 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 3019 { 3020 struct prison *pr; 3021 3022 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3023 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 3024 3025 pr = cred->cr_prison; 3026 if (!(pr->pr_flags & PR_IP4)) 3027 return (0); 3028 mtx_lock(&pr->pr_mtx); 3029 if (!(pr->pr_flags & PR_IP4)) { 3030 mtx_unlock(&pr->pr_mtx); 3031 return (0); 3032 } 3033 if (pr->pr_ip4 == NULL) { 3034 mtx_unlock(&pr->pr_mtx); 3035 return (EAFNOSUPPORT); 3036 } 3037 3038 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 3039 ia->s_addr = pr->pr_ip4[0].s_addr; 3040 mtx_unlock(&pr->pr_mtx); 3041 return (0); 3042 } 3043 3044 /* 3045 * Return success because nothing had to be changed. 3046 */ 3047 mtx_unlock(&pr->pr_mtx); 3048 return (0); 3049 } 3050 3051 /* 3052 * Check if given address belongs to the jail referenced by cred/prison. 3053 * 3054 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 3055 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3056 * doesn't allow IPv4. Address passed in in NBO. 3057 */ 3058 static int 3059 _prison_check_ip4(const struct prison *pr, const struct in_addr *ia) 3060 { 3061 int i, a, z, d; 3062 3063 /* 3064 * Check the primary IP. 3065 */ 3066 if (pr->pr_ip4[0].s_addr == ia->s_addr) 3067 return (0); 3068 3069 /* 3070 * All the other IPs are sorted so we can do a binary search. 3071 */ 3072 a = 0; 3073 z = pr->pr_ip4s - 2; 3074 while (a <= z) { 3075 i = (a + z) / 2; 3076 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 3077 if (d > 0) 3078 z = i - 1; 3079 else if (d < 0) 3080 a = i + 1; 3081 else 3082 return (0); 3083 } 3084 3085 return (EADDRNOTAVAIL); 3086 } 3087 3088 int 3089 prison_check_ip4(const struct ucred *cred, const struct in_addr *ia) 3090 { 3091 struct prison *pr; 3092 int error; 3093 3094 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3095 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 3096 3097 pr = cred->cr_prison; 3098 if (!(pr->pr_flags & PR_IP4)) 3099 return (0); 3100 mtx_lock(&pr->pr_mtx); 3101 if (!(pr->pr_flags & PR_IP4)) { 3102 mtx_unlock(&pr->pr_mtx); 3103 return (0); 3104 } 3105 if (pr->pr_ip4 == NULL) { 3106 mtx_unlock(&pr->pr_mtx); 3107 return (EAFNOSUPPORT); 3108 } 3109 3110 error = _prison_check_ip4(pr, ia); 3111 mtx_unlock(&pr->pr_mtx); 3112 return (error); 3113 } 3114 #endif 3115 3116 #ifdef INET6 3117 static int 3118 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 3119 { 3120 int ii, ij, used; 3121 struct prison *ppr; 3122 3123 ppr = pr->pr_parent; 3124 if (!(pr->pr_flags & PR_IP6_USER)) { 3125 /* This has no user settings, so just copy the parent's list. */ 3126 if (pr->pr_ip6s < ppr->pr_ip6s) { 3127 /* 3128 * There's no room for the parent's list. Use the 3129 * new list buffer, which is assumed to be big enough 3130 * (if it was passed). If there's no buffer, try to 3131 * allocate one. 3132 */ 3133 used = 1; 3134 if (newip6 == NULL) { 3135 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 3136 M_PRISON, M_NOWAIT); 3137 if (newip6 != NULL) 3138 used = 0; 3139 } 3140 if (newip6 != NULL) { 3141 bcopy(ppr->pr_ip6, newip6, 3142 ppr->pr_ip6s * sizeof(*newip6)); 3143 free(pr->pr_ip6, M_PRISON); 3144 pr->pr_ip6 = newip6; 3145 pr->pr_ip6s = ppr->pr_ip6s; 3146 } 3147 return (used); 3148 } 3149 pr->pr_ip6s = ppr->pr_ip6s; 3150 if (pr->pr_ip6s > 0) 3151 bcopy(ppr->pr_ip6, pr->pr_ip6, 3152 pr->pr_ip6s * sizeof(*newip6)); 3153 else if (pr->pr_ip6 != NULL) { 3154 free(pr->pr_ip6, M_PRISON); 3155 pr->pr_ip6 = NULL; 3156 } 3157 } else if (pr->pr_ip6s > 0) { 3158 /* Remove addresses that aren't in the parent. */ 3159 for (ij = 0; ij < ppr->pr_ip6s; ij++) 3160 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 3161 &ppr->pr_ip6[ij])) 3162 break; 3163 if (ij < ppr->pr_ip6s) 3164 ii = 1; 3165 else { 3166 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 3167 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 3168 ii = 0; 3169 } 3170 for (ij = 1; ii < pr->pr_ip6s; ) { 3171 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 3172 &ppr->pr_ip6[0])) { 3173 ii++; 3174 continue; 3175 } 3176 switch (ij >= ppr->pr_ip6s ? -1 : 3177 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 3178 case -1: 3179 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 3180 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 3181 break; 3182 case 0: 3183 ii++; 3184 ij++; 3185 break; 3186 case 1: 3187 ij++; 3188 break; 3189 } 3190 } 3191 if (pr->pr_ip6s == 0) { 3192 free(pr->pr_ip6, M_PRISON); 3193 pr->pr_ip6 = NULL; 3194 } 3195 } 3196 return 0; 3197 } 3198 3199 /* 3200 * Pass back primary IPv6 address for this jail. 3201 * 3202 * If not restricted return success but do not alter the address. Caller has 3203 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3204 * 3205 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3206 */ 3207 int 3208 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3209 { 3210 struct prison *pr; 3211 3212 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3213 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3214 3215 pr = cred->cr_prison; 3216 if (!(pr->pr_flags & PR_IP6)) 3217 return (0); 3218 mtx_lock(&pr->pr_mtx); 3219 if (!(pr->pr_flags & PR_IP6)) { 3220 mtx_unlock(&pr->pr_mtx); 3221 return (0); 3222 } 3223 if (pr->pr_ip6 == NULL) { 3224 mtx_unlock(&pr->pr_mtx); 3225 return (EAFNOSUPPORT); 3226 } 3227 3228 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3229 mtx_unlock(&pr->pr_mtx); 3230 return (0); 3231 } 3232 3233 /* 3234 * Return 1 if we should do proper source address selection or are not jailed. 3235 * We will return 0 if we should bypass source address selection in favour 3236 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3237 * returned in NBO. 3238 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3239 */ 3240 int 3241 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3242 { 3243 struct prison *pr; 3244 struct in6_addr lia6; 3245 int error; 3246 3247 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3248 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3249 3250 if (!jailed(cred)) 3251 return (1); 3252 3253 pr = cred->cr_prison; 3254 if (pr->pr_flags & PR_IP6_SADDRSEL) 3255 return (1); 3256 3257 lia6 = in6addr_any; 3258 error = prison_get_ip6(cred, &lia6); 3259 if (error) 3260 return (error); 3261 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3262 return (1); 3263 3264 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3265 return (0); 3266 } 3267 3268 /* 3269 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3270 */ 3271 int 3272 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3273 { 3274 3275 if (pr1 == pr2) 3276 return (1); 3277 3278 while (pr1 != &prison0 && 3279 #ifdef VIMAGE 3280 !(pr1->pr_flags & PR_VNET) && 3281 #endif 3282 !(pr1->pr_flags & PR_IP6_USER)) 3283 pr1 = pr1->pr_parent; 3284 while (pr2 != &prison0 && 3285 #ifdef VIMAGE 3286 !(pr2->pr_flags & PR_VNET) && 3287 #endif 3288 !(pr2->pr_flags & PR_IP6_USER)) 3289 pr2 = pr2->pr_parent; 3290 return (pr1 == pr2); 3291 } 3292 3293 /* 3294 * Make sure our (source) address is set to something meaningful to this jail. 3295 * 3296 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3297 * when needed while binding. 3298 * 3299 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3300 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3301 * doesn't allow IPv6. 3302 */ 3303 int 3304 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3305 { 3306 struct prison *pr; 3307 int error; 3308 3309 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3310 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3311 3312 pr = cred->cr_prison; 3313 if (!(pr->pr_flags & PR_IP6)) 3314 return (0); 3315 mtx_lock(&pr->pr_mtx); 3316 if (!(pr->pr_flags & PR_IP6)) { 3317 mtx_unlock(&pr->pr_mtx); 3318 return (0); 3319 } 3320 if (pr->pr_ip6 == NULL) { 3321 mtx_unlock(&pr->pr_mtx); 3322 return (EAFNOSUPPORT); 3323 } 3324 3325 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3326 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3327 mtx_unlock(&pr->pr_mtx); 3328 return (0); 3329 } 3330 3331 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3332 /* 3333 * In case there is only 1 IPv6 address, and v6only is true, 3334 * then bind directly. 3335 */ 3336 if (v6only != 0 && pr->pr_ip6s == 1) 3337 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3338 mtx_unlock(&pr->pr_mtx); 3339 return (0); 3340 } 3341 3342 error = _prison_check_ip6(pr, ia6); 3343 mtx_unlock(&pr->pr_mtx); 3344 return (error); 3345 } 3346 3347 /* 3348 * Rewrite destination address in case we will connect to loopback address. 3349 * 3350 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3351 */ 3352 int 3353 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3354 { 3355 struct prison *pr; 3356 3357 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3358 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3359 3360 pr = cred->cr_prison; 3361 if (!(pr->pr_flags & PR_IP6)) 3362 return (0); 3363 mtx_lock(&pr->pr_mtx); 3364 if (!(pr->pr_flags & PR_IP6)) { 3365 mtx_unlock(&pr->pr_mtx); 3366 return (0); 3367 } 3368 if (pr->pr_ip6 == NULL) { 3369 mtx_unlock(&pr->pr_mtx); 3370 return (EAFNOSUPPORT); 3371 } 3372 3373 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3374 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3375 mtx_unlock(&pr->pr_mtx); 3376 return (0); 3377 } 3378 3379 /* 3380 * Return success because nothing had to be changed. 3381 */ 3382 mtx_unlock(&pr->pr_mtx); 3383 return (0); 3384 } 3385 3386 /* 3387 * Check if given address belongs to the jail referenced by cred/prison. 3388 * 3389 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3390 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3391 * doesn't allow IPv6. 3392 */ 3393 static int 3394 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3395 { 3396 int i, a, z, d; 3397 3398 /* 3399 * Check the primary IP. 3400 */ 3401 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3402 return (0); 3403 3404 /* 3405 * All the other IPs are sorted so we can do a binary search. 3406 */ 3407 a = 0; 3408 z = pr->pr_ip6s - 2; 3409 while (a <= z) { 3410 i = (a + z) / 2; 3411 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3412 if (d > 0) 3413 z = i - 1; 3414 else if (d < 0) 3415 a = i + 1; 3416 else 3417 return (0); 3418 } 3419 3420 return (EADDRNOTAVAIL); 3421 } 3422 3423 int 3424 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3425 { 3426 struct prison *pr; 3427 int error; 3428 3429 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3430 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3431 3432 pr = cred->cr_prison; 3433 if (!(pr->pr_flags & PR_IP6)) 3434 return (0); 3435 mtx_lock(&pr->pr_mtx); 3436 if (!(pr->pr_flags & PR_IP6)) { 3437 mtx_unlock(&pr->pr_mtx); 3438 return (0); 3439 } 3440 if (pr->pr_ip6 == NULL) { 3441 mtx_unlock(&pr->pr_mtx); 3442 return (EAFNOSUPPORT); 3443 } 3444 3445 error = _prison_check_ip6(pr, ia6); 3446 mtx_unlock(&pr->pr_mtx); 3447 return (error); 3448 } 3449 #endif 3450 3451 /* 3452 * Check if a jail supports the given address family. 3453 * 3454 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3455 * if not. 3456 */ 3457 int 3458 prison_check_af(struct ucred *cred, int af) 3459 { 3460 struct prison *pr; 3461 int error; 3462 3463 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3464 3465 pr = cred->cr_prison; 3466 #ifdef VIMAGE 3467 /* Prisons with their own network stack are not limited. */ 3468 if (prison_owns_vnet(cred)) 3469 return (0); 3470 #endif 3471 3472 error = 0; 3473 switch (af) 3474 { 3475 #ifdef INET 3476 case AF_INET: 3477 if (pr->pr_flags & PR_IP4) 3478 { 3479 mtx_lock(&pr->pr_mtx); 3480 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3481 error = EAFNOSUPPORT; 3482 mtx_unlock(&pr->pr_mtx); 3483 } 3484 break; 3485 #endif 3486 #ifdef INET6 3487 case AF_INET6: 3488 if (pr->pr_flags & PR_IP6) 3489 { 3490 mtx_lock(&pr->pr_mtx); 3491 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3492 error = EAFNOSUPPORT; 3493 mtx_unlock(&pr->pr_mtx); 3494 } 3495 break; 3496 #endif 3497 case AF_LOCAL: 3498 case AF_ROUTE: 3499 break; 3500 default: 3501 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3502 error = EAFNOSUPPORT; 3503 } 3504 return (error); 3505 } 3506 3507 /* 3508 * Check if given address belongs to the jail referenced by cred (wrapper to 3509 * prison_check_ip[46]). 3510 * 3511 * Returns 0 if jail doesn't restrict the address family or if address belongs 3512 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3513 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3514 */ 3515 int 3516 prison_if(struct ucred *cred, struct sockaddr *sa) 3517 { 3518 #ifdef INET 3519 struct sockaddr_in *sai; 3520 #endif 3521 #ifdef INET6 3522 struct sockaddr_in6 *sai6; 3523 #endif 3524 int error; 3525 3526 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3527 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3528 3529 #ifdef VIMAGE 3530 if (prison_owns_vnet(cred)) 3531 return (0); 3532 #endif 3533 3534 error = 0; 3535 switch (sa->sa_family) 3536 { 3537 #ifdef INET 3538 case AF_INET: 3539 sai = (struct sockaddr_in *)sa; 3540 error = prison_check_ip4(cred, &sai->sin_addr); 3541 break; 3542 #endif 3543 #ifdef INET6 3544 case AF_INET6: 3545 sai6 = (struct sockaddr_in6 *)sa; 3546 error = prison_check_ip6(cred, &sai6->sin6_addr); 3547 break; 3548 #endif 3549 default: 3550 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3551 error = EAFNOSUPPORT; 3552 } 3553 return (error); 3554 } 3555 3556 /* 3557 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3558 */ 3559 int 3560 prison_check(struct ucred *cred1, struct ucred *cred2) 3561 { 3562 3563 return ((cred1->cr_prison == cred2->cr_prison || 3564 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3565 } 3566 3567 /* 3568 * Return 1 if p2 is a child of p1, otherwise 0. 3569 */ 3570 int 3571 prison_ischild(struct prison *pr1, struct prison *pr2) 3572 { 3573 3574 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3575 if (pr1 == pr2) 3576 return (1); 3577 return (0); 3578 } 3579 3580 /* 3581 * Return 1 if the passed credential is in a jail, otherwise 0. 3582 */ 3583 int 3584 jailed(struct ucred *cred) 3585 { 3586 3587 return (cred->cr_prison != &prison0); 3588 } 3589 3590 /* 3591 * Return 1 if the passed credential is in a jail and that jail does not 3592 * have its own virtual network stack, otherwise 0. 3593 */ 3594 int 3595 jailed_without_vnet(struct ucred *cred) 3596 { 3597 3598 if (!jailed(cred)) 3599 return (0); 3600 #ifdef VIMAGE 3601 if (prison_owns_vnet(cred)) 3602 return (0); 3603 #endif 3604 3605 return (1); 3606 } 3607 3608 /* 3609 * Return the correct hostname (domainname, et al) for the passed credential. 3610 */ 3611 void 3612 getcredhostname(struct ucred *cred, char *buf, size_t size) 3613 { 3614 struct prison *pr; 3615 3616 /* 3617 * A NULL credential can be used to shortcut to the physical 3618 * system's hostname. 3619 */ 3620 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3621 mtx_lock(&pr->pr_mtx); 3622 strlcpy(buf, pr->pr_hostname, size); 3623 mtx_unlock(&pr->pr_mtx); 3624 } 3625 3626 void 3627 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3628 { 3629 3630 mtx_lock(&cred->cr_prison->pr_mtx); 3631 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3632 mtx_unlock(&cred->cr_prison->pr_mtx); 3633 } 3634 3635 void 3636 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3637 { 3638 3639 mtx_lock(&cred->cr_prison->pr_mtx); 3640 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3641 mtx_unlock(&cred->cr_prison->pr_mtx); 3642 } 3643 3644 void 3645 getcredhostid(struct ucred *cred, unsigned long *hostid) 3646 { 3647 3648 mtx_lock(&cred->cr_prison->pr_mtx); 3649 *hostid = cred->cr_prison->pr_hostid; 3650 mtx_unlock(&cred->cr_prison->pr_mtx); 3651 } 3652 3653 #ifdef VIMAGE 3654 /* 3655 * Determine whether the prison represented by cred owns 3656 * its vnet rather than having it inherited. 3657 * 3658 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3659 */ 3660 int 3661 prison_owns_vnet(struct ucred *cred) 3662 { 3663 3664 /* 3665 * vnets cannot be added/removed after jail creation, 3666 * so no need to lock here. 3667 */ 3668 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3669 } 3670 #endif 3671 3672 /* 3673 * Determine whether the subject represented by cred can "see" 3674 * status of a mount point. 3675 * Returns: 0 for permitted, ENOENT otherwise. 3676 * XXX: This function should be called cr_canseemount() and should be 3677 * placed in kern_prot.c. 3678 */ 3679 int 3680 prison_canseemount(struct ucred *cred, struct mount *mp) 3681 { 3682 struct prison *pr; 3683 struct statfs *sp; 3684 size_t len; 3685 3686 pr = cred->cr_prison; 3687 if (pr->pr_enforce_statfs == 0) 3688 return (0); 3689 if (pr->pr_root->v_mount == mp) 3690 return (0); 3691 if (pr->pr_enforce_statfs == 2) 3692 return (ENOENT); 3693 /* 3694 * If jail's chroot directory is set to "/" we should be able to see 3695 * all mount-points from inside a jail. 3696 * This is ugly check, but this is the only situation when jail's 3697 * directory ends with '/'. 3698 */ 3699 if (strcmp(pr->pr_path, "/") == 0) 3700 return (0); 3701 len = strlen(pr->pr_path); 3702 sp = &mp->mnt_stat; 3703 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3704 return (ENOENT); 3705 /* 3706 * Be sure that we don't have situation where jail's root directory 3707 * is "/some/path" and mount point is "/some/pathpath". 3708 */ 3709 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3710 return (ENOENT); 3711 return (0); 3712 } 3713 3714 void 3715 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3716 { 3717 char jpath[MAXPATHLEN]; 3718 struct prison *pr; 3719 size_t len; 3720 3721 pr = cred->cr_prison; 3722 if (pr->pr_enforce_statfs == 0) 3723 return; 3724 if (prison_canseemount(cred, mp) != 0) { 3725 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3726 strlcpy(sp->f_mntonname, "[restricted]", 3727 sizeof(sp->f_mntonname)); 3728 return; 3729 } 3730 if (pr->pr_root->v_mount == mp) { 3731 /* 3732 * Clear current buffer data, so we are sure nothing from 3733 * the valid path left there. 3734 */ 3735 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3736 *sp->f_mntonname = '/'; 3737 return; 3738 } 3739 /* 3740 * If jail's chroot directory is set to "/" we should be able to see 3741 * all mount-points from inside a jail. 3742 */ 3743 if (strcmp(pr->pr_path, "/") == 0) 3744 return; 3745 len = strlen(pr->pr_path); 3746 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3747 /* 3748 * Clear current buffer data, so we are sure nothing from 3749 * the valid path left there. 3750 */ 3751 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3752 if (*jpath == '\0') { 3753 /* Should never happen. */ 3754 *sp->f_mntonname = '/'; 3755 } else { 3756 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3757 } 3758 } 3759 3760 /* 3761 * Check with permission for a specific privilege is granted within jail. We 3762 * have a specific list of accepted privileges; the rest are denied. 3763 */ 3764 int 3765 prison_priv_check(struct ucred *cred, int priv) 3766 { 3767 3768 if (!jailed(cred)) 3769 return (0); 3770 3771 #ifdef VIMAGE 3772 /* 3773 * Privileges specific to prisons with a virtual network stack. 3774 * There might be a duplicate entry here in case the privilege 3775 * is only granted conditionally in the legacy jail case. 3776 */ 3777 switch (priv) { 3778 #ifdef notyet 3779 /* 3780 * NFS-specific privileges. 3781 */ 3782 case PRIV_NFS_DAEMON: 3783 case PRIV_NFS_LOCKD: 3784 #endif 3785 /* 3786 * Network stack privileges. 3787 */ 3788 case PRIV_NET_BRIDGE: 3789 case PRIV_NET_GRE: 3790 case PRIV_NET_BPF: 3791 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3792 case PRIV_NET_ROUTE: 3793 case PRIV_NET_TAP: 3794 case PRIV_NET_SETIFMTU: 3795 case PRIV_NET_SETIFFLAGS: 3796 case PRIV_NET_SETIFCAP: 3797 case PRIV_NET_SETIFDESCR: 3798 case PRIV_NET_SETIFNAME : 3799 case PRIV_NET_SETIFMETRIC: 3800 case PRIV_NET_SETIFPHYS: 3801 case PRIV_NET_SETIFMAC: 3802 case PRIV_NET_ADDMULTI: 3803 case PRIV_NET_DELMULTI: 3804 case PRIV_NET_HWIOCTL: 3805 case PRIV_NET_SETLLADDR: 3806 case PRIV_NET_ADDIFGROUP: 3807 case PRIV_NET_DELIFGROUP: 3808 case PRIV_NET_IFCREATE: 3809 case PRIV_NET_IFDESTROY: 3810 case PRIV_NET_ADDIFADDR: 3811 case PRIV_NET_DELIFADDR: 3812 case PRIV_NET_LAGG: 3813 case PRIV_NET_GIF: 3814 case PRIV_NET_SETIFVNET: 3815 case PRIV_NET_SETIFFIB: 3816 3817 /* 3818 * 802.11-related privileges. 3819 */ 3820 case PRIV_NET80211_GETKEY: 3821 #ifdef notyet 3822 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3823 #endif 3824 3825 #ifdef notyet 3826 /* 3827 * ATM privileges. 3828 */ 3829 case PRIV_NETATM_CFG: 3830 case PRIV_NETATM_ADD: 3831 case PRIV_NETATM_DEL: 3832 case PRIV_NETATM_SET: 3833 3834 /* 3835 * Bluetooth privileges. 3836 */ 3837 case PRIV_NETBLUETOOTH_RAW: 3838 #endif 3839 3840 /* 3841 * Netgraph and netgraph module privileges. 3842 */ 3843 case PRIV_NETGRAPH_CONTROL: 3844 #ifdef notyet 3845 case PRIV_NETGRAPH_TTY: 3846 #endif 3847 3848 /* 3849 * IPv4 and IPv6 privileges. 3850 */ 3851 case PRIV_NETINET_IPFW: 3852 case PRIV_NETINET_DIVERT: 3853 case PRIV_NETINET_PF: 3854 case PRIV_NETINET_DUMMYNET: 3855 case PRIV_NETINET_CARP: 3856 case PRIV_NETINET_MROUTE: 3857 case PRIV_NETINET_RAW: 3858 case PRIV_NETINET_ADDRCTRL6: 3859 case PRIV_NETINET_ND6: 3860 case PRIV_NETINET_SCOPE6: 3861 case PRIV_NETINET_ALIFETIME6: 3862 case PRIV_NETINET_IPSEC: 3863 case PRIV_NETINET_BINDANY: 3864 3865 #ifdef notyet 3866 /* 3867 * NCP privileges. 3868 */ 3869 case PRIV_NETNCP: 3870 3871 /* 3872 * SMB privileges. 3873 */ 3874 case PRIV_NETSMB: 3875 #endif 3876 3877 /* 3878 * No default: or deny here. 3879 * In case of no permit fall through to next switch(). 3880 */ 3881 if (cred->cr_prison->pr_flags & PR_VNET) 3882 return (0); 3883 } 3884 #endif /* VIMAGE */ 3885 3886 switch (priv) { 3887 3888 /* 3889 * Allow ktrace privileges for root in jail. 3890 */ 3891 case PRIV_KTRACE: 3892 3893 #if 0 3894 /* 3895 * Allow jailed processes to configure audit identity and 3896 * submit audit records (login, etc). In the future we may 3897 * want to further refine the relationship between audit and 3898 * jail. 3899 */ 3900 case PRIV_AUDIT_GETAUDIT: 3901 case PRIV_AUDIT_SETAUDIT: 3902 case PRIV_AUDIT_SUBMIT: 3903 #endif 3904 3905 /* 3906 * Allow jailed processes to manipulate process UNIX 3907 * credentials in any way they see fit. 3908 */ 3909 case PRIV_CRED_SETUID: 3910 case PRIV_CRED_SETEUID: 3911 case PRIV_CRED_SETGID: 3912 case PRIV_CRED_SETEGID: 3913 case PRIV_CRED_SETGROUPS: 3914 case PRIV_CRED_SETREUID: 3915 case PRIV_CRED_SETREGID: 3916 case PRIV_CRED_SETRESUID: 3917 case PRIV_CRED_SETRESGID: 3918 3919 /* 3920 * Jail implements visibility constraints already, so allow 3921 * jailed root to override uid/gid-based constraints. 3922 */ 3923 case PRIV_SEEOTHERGIDS: 3924 case PRIV_SEEOTHERUIDS: 3925 3926 /* 3927 * Jail implements inter-process debugging limits already, so 3928 * allow jailed root various debugging privileges. 3929 */ 3930 case PRIV_DEBUG_DIFFCRED: 3931 case PRIV_DEBUG_SUGID: 3932 case PRIV_DEBUG_UNPRIV: 3933 3934 /* 3935 * Allow jail to set various resource limits and login 3936 * properties, and for now, exceed process resource limits. 3937 */ 3938 case PRIV_PROC_LIMIT: 3939 case PRIV_PROC_SETLOGIN: 3940 case PRIV_PROC_SETRLIMIT: 3941 3942 /* 3943 * System V and POSIX IPC privileges are granted in jail. 3944 */ 3945 case PRIV_IPC_READ: 3946 case PRIV_IPC_WRITE: 3947 case PRIV_IPC_ADMIN: 3948 case PRIV_IPC_MSGSIZE: 3949 case PRIV_MQ_ADMIN: 3950 3951 /* 3952 * Jail operations within a jail work on child jails. 3953 */ 3954 case PRIV_JAIL_ATTACH: 3955 case PRIV_JAIL_SET: 3956 case PRIV_JAIL_REMOVE: 3957 3958 /* 3959 * Jail implements its own inter-process limits, so allow 3960 * root processes in jail to change scheduling on other 3961 * processes in the same jail. Likewise for signalling. 3962 */ 3963 case PRIV_SCHED_DIFFCRED: 3964 case PRIV_SCHED_CPUSET: 3965 case PRIV_SIGNAL_DIFFCRED: 3966 case PRIV_SIGNAL_SUGID: 3967 3968 /* 3969 * Allow jailed processes to write to sysctls marked as jail 3970 * writable. 3971 */ 3972 case PRIV_SYSCTL_WRITEJAIL: 3973 3974 /* 3975 * Allow root in jail to manage a variety of quota 3976 * properties. These should likely be conditional on a 3977 * configuration option. 3978 */ 3979 case PRIV_VFS_GETQUOTA: 3980 case PRIV_VFS_SETQUOTA: 3981 3982 /* 3983 * Since Jail relies on chroot() to implement file system 3984 * protections, grant many VFS privileges to root in jail. 3985 * Be careful to exclude mount-related and NFS-related 3986 * privileges. 3987 */ 3988 case PRIV_VFS_READ: 3989 case PRIV_VFS_WRITE: 3990 case PRIV_VFS_ADMIN: 3991 case PRIV_VFS_EXEC: 3992 case PRIV_VFS_LOOKUP: 3993 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3994 case PRIV_VFS_CHFLAGS_DEV: 3995 case PRIV_VFS_CHOWN: 3996 case PRIV_VFS_CHROOT: 3997 case PRIV_VFS_RETAINSUGID: 3998 case PRIV_VFS_FCHROOT: 3999 case PRIV_VFS_LINK: 4000 case PRIV_VFS_SETGID: 4001 case PRIV_VFS_STAT: 4002 case PRIV_VFS_STICKYFILE: 4003 4004 /* 4005 * As in the non-jail case, non-root users are expected to be 4006 * able to read kernel/phyiscal memory (provided /dev/[k]mem 4007 * exists in the jail and they have permission to access it). 4008 */ 4009 case PRIV_KMEM_READ: 4010 return (0); 4011 4012 /* 4013 * Depending on the global setting, allow privilege of 4014 * setting system flags. 4015 */ 4016 case PRIV_VFS_SYSFLAGS: 4017 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 4018 return (0); 4019 else 4020 return (EPERM); 4021 4022 /* 4023 * Depending on the global setting, allow privilege of 4024 * mounting/unmounting file systems. 4025 */ 4026 case PRIV_VFS_MOUNT: 4027 case PRIV_VFS_UNMOUNT: 4028 case PRIV_VFS_MOUNT_NONUSER: 4029 case PRIV_VFS_MOUNT_OWNER: 4030 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 4031 cred->cr_prison->pr_enforce_statfs < 2) 4032 return (0); 4033 else 4034 return (EPERM); 4035 4036 /* 4037 * Allow jailed root to bind reserved ports and reuse in-use 4038 * ports. 4039 */ 4040 case PRIV_NETINET_RESERVEDPORT: 4041 case PRIV_NETINET_REUSEPORT: 4042 return (0); 4043 4044 /* 4045 * Allow jailed root to set certain IPv4/6 (option) headers. 4046 */ 4047 case PRIV_NETINET_SETHDROPTS: 4048 return (0); 4049 4050 /* 4051 * Conditionally allow creating raw sockets in jail. 4052 */ 4053 case PRIV_NETINET_RAW: 4054 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 4055 return (0); 4056 else 4057 return (EPERM); 4058 4059 /* 4060 * Since jail implements its own visibility limits on netstat 4061 * sysctls, allow getcred. This allows identd to work in 4062 * jail. 4063 */ 4064 case PRIV_NETINET_GETCRED: 4065 return (0); 4066 4067 /* 4068 * Allow jailed root to set loginclass. 4069 */ 4070 case PRIV_PROC_SETLOGINCLASS: 4071 return (0); 4072 4073 default: 4074 /* 4075 * In all remaining cases, deny the privilege request. This 4076 * includes almost all network privileges, many system 4077 * configuration privileges. 4078 */ 4079 return (EPERM); 4080 } 4081 } 4082 4083 /* 4084 * Return the part of pr2's name that is relative to pr1, or the whole name 4085 * if it does not directly follow. 4086 */ 4087 4088 char * 4089 prison_name(struct prison *pr1, struct prison *pr2) 4090 { 4091 char *name; 4092 4093 /* Jails see themselves as "" (if they see themselves at all). */ 4094 if (pr1 == pr2) 4095 return ""; 4096 name = pr2->pr_name; 4097 if (prison_ischild(pr1, pr2)) { 4098 /* 4099 * pr1 isn't locked (and allprison_lock may not be either) 4100 * so its length can't be counted on. But the number of dots 4101 * can be counted on - and counted. 4102 */ 4103 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 4104 name = strchr(name, '.') + 1; 4105 } 4106 return (name); 4107 } 4108 4109 /* 4110 * Return the part of pr2's path that is relative to pr1, or the whole path 4111 * if it does not directly follow. 4112 */ 4113 static char * 4114 prison_path(struct prison *pr1, struct prison *pr2) 4115 { 4116 char *path1, *path2; 4117 int len1; 4118 4119 path1 = pr1->pr_path; 4120 path2 = pr2->pr_path; 4121 if (!strcmp(path1, "/")) 4122 return (path2); 4123 len1 = strlen(path1); 4124 if (strncmp(path1, path2, len1)) 4125 return (path2); 4126 if (path2[len1] == '\0') 4127 return "/"; 4128 if (path2[len1] == '/') 4129 return (path2 + len1); 4130 return (path2); 4131 } 4132 4133 4134 /* 4135 * Jail-related sysctls. 4136 */ 4137 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 4138 "Jails"); 4139 4140 static int 4141 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4142 { 4143 struct xprison *xp; 4144 struct prison *pr, *cpr; 4145 #ifdef INET 4146 struct in_addr *ip4 = NULL; 4147 int ip4s = 0; 4148 #endif 4149 #ifdef INET6 4150 struct in6_addr *ip6 = NULL; 4151 int ip6s = 0; 4152 #endif 4153 int descend, error; 4154 4155 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4156 pr = req->td->td_ucred->cr_prison; 4157 error = 0; 4158 sx_slock(&allprison_lock); 4159 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4160 #if defined(INET) || defined(INET6) 4161 again: 4162 #endif 4163 mtx_lock(&cpr->pr_mtx); 4164 #ifdef INET 4165 if (cpr->pr_ip4s > 0) { 4166 if (ip4s < cpr->pr_ip4s) { 4167 ip4s = cpr->pr_ip4s; 4168 mtx_unlock(&cpr->pr_mtx); 4169 ip4 = realloc(ip4, ip4s * 4170 sizeof(struct in_addr), M_TEMP, M_WAITOK); 4171 goto again; 4172 } 4173 bcopy(cpr->pr_ip4, ip4, 4174 cpr->pr_ip4s * sizeof(struct in_addr)); 4175 } 4176 #endif 4177 #ifdef INET6 4178 if (cpr->pr_ip6s > 0) { 4179 if (ip6s < cpr->pr_ip6s) { 4180 ip6s = cpr->pr_ip6s; 4181 mtx_unlock(&cpr->pr_mtx); 4182 ip6 = realloc(ip6, ip6s * 4183 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 4184 goto again; 4185 } 4186 bcopy(cpr->pr_ip6, ip6, 4187 cpr->pr_ip6s * sizeof(struct in6_addr)); 4188 } 4189 #endif 4190 if (cpr->pr_ref == 0) { 4191 mtx_unlock(&cpr->pr_mtx); 4192 continue; 4193 } 4194 bzero(xp, sizeof(*xp)); 4195 xp->pr_version = XPRISON_VERSION; 4196 xp->pr_id = cpr->pr_id; 4197 xp->pr_state = cpr->pr_uref > 0 4198 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4199 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4200 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4201 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4202 #ifdef INET 4203 xp->pr_ip4s = cpr->pr_ip4s; 4204 #endif 4205 #ifdef INET6 4206 xp->pr_ip6s = cpr->pr_ip6s; 4207 #endif 4208 mtx_unlock(&cpr->pr_mtx); 4209 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4210 if (error) 4211 break; 4212 #ifdef INET 4213 if (xp->pr_ip4s > 0) { 4214 error = SYSCTL_OUT(req, ip4, 4215 xp->pr_ip4s * sizeof(struct in_addr)); 4216 if (error) 4217 break; 4218 } 4219 #endif 4220 #ifdef INET6 4221 if (xp->pr_ip6s > 0) { 4222 error = SYSCTL_OUT(req, ip6, 4223 xp->pr_ip6s * sizeof(struct in6_addr)); 4224 if (error) 4225 break; 4226 } 4227 #endif 4228 } 4229 sx_sunlock(&allprison_lock); 4230 free(xp, M_TEMP); 4231 #ifdef INET 4232 free(ip4, M_TEMP); 4233 #endif 4234 #ifdef INET6 4235 free(ip6, M_TEMP); 4236 #endif 4237 return (error); 4238 } 4239 4240 SYSCTL_OID(_security_jail, OID_AUTO, list, 4241 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4242 sysctl_jail_list, "S", "List of active jails"); 4243 4244 static int 4245 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4246 { 4247 int error, injail; 4248 4249 injail = jailed(req->td->td_ucred); 4250 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4251 4252 return (error); 4253 } 4254 4255 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4256 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4257 sysctl_jail_jailed, "I", "Process in jail?"); 4258 4259 static int 4260 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4261 { 4262 int error, havevnet; 4263 #ifdef VIMAGE 4264 struct ucred *cred = req->td->td_ucred; 4265 4266 havevnet = jailed(cred) && prison_owns_vnet(cred); 4267 #else 4268 havevnet = 0; 4269 #endif 4270 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4271 4272 return (error); 4273 } 4274 4275 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4276 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4277 sysctl_jail_vnet, "I", "Jail owns VNET?"); 4278 4279 #if defined(INET) || defined(INET6) 4280 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4281 &jail_max_af_ips, 0, 4282 "Number of IP addresses a jail may have at most per address family (deprecated)"); 4283 #endif 4284 4285 /* 4286 * Default parameters for jail(2) compatibility. For historical reasons, 4287 * the sysctl names have varying similarity to the parameter names. Prisons 4288 * just see their own parameters, and can't change them. 4289 */ 4290 static int 4291 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4292 { 4293 struct prison *pr; 4294 int allow, error, i; 4295 4296 pr = req->td->td_ucred->cr_prison; 4297 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4298 4299 /* Get the current flag value, and convert it to a boolean. */ 4300 i = (allow & arg2) ? 1 : 0; 4301 if (arg1 != NULL) 4302 i = !i; 4303 error = sysctl_handle_int(oidp, &i, 0, req); 4304 if (error || !req->newptr) 4305 return (error); 4306 i = i ? arg2 : 0; 4307 if (arg1 != NULL) 4308 i ^= arg2; 4309 /* 4310 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4311 * for writing. 4312 */ 4313 mtx_lock(&prison0.pr_mtx); 4314 jail_default_allow = (jail_default_allow & ~arg2) | i; 4315 mtx_unlock(&prison0.pr_mtx); 4316 return (0); 4317 } 4318 4319 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4320 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4321 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4322 "Processes in jail can set their hostnames (deprecated)"); 4323 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4324 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4325 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4326 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 4327 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4328 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4329 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4330 "Processes in jail can use System V IPC primitives (deprecated)"); 4331 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4332 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4333 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4334 "Prison root can create raw sockets (deprecated)"); 4335 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4336 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4337 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4338 "Processes in jail can alter system file flags (deprecated)"); 4339 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4340 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4341 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4342 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 4343 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 4344 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4345 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 4346 "Processes in jail can mount the devfs file system (deprecated)"); 4347 SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed, 4348 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4349 NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I", 4350 "Processes in jail can mount the fdescfs file system (deprecated)"); 4351 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 4352 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4353 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 4354 "Processes in jail can mount the nullfs file system (deprecated)"); 4355 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 4356 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4357 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 4358 "Processes in jail can mount the procfs file system (deprecated)"); 4359 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linprocfs_allowed, 4360 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4361 NULL, PR_ALLOW_MOUNT_LINPROCFS, sysctl_jail_default_allow, "I", 4362 "Processes in jail can mount the linprocfs file system (deprecated)"); 4363 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linsysfs_allowed, 4364 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4365 NULL, PR_ALLOW_MOUNT_LINSYSFS, sysctl_jail_default_allow, "I", 4366 "Processes in jail can mount the linsysfs file system (deprecated)"); 4367 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed, 4368 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4369 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I", 4370 "Processes in jail can mount the tmpfs file system (deprecated)"); 4371 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 4372 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4373 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 4374 "Processes in jail can mount the zfs file system (deprecated)"); 4375 4376 static int 4377 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4378 { 4379 struct prison *pr; 4380 int level, error; 4381 4382 pr = req->td->td_ucred->cr_prison; 4383 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4384 error = sysctl_handle_int(oidp, &level, 0, req); 4385 if (error || !req->newptr) 4386 return (error); 4387 *(int *)arg1 = level; 4388 return (0); 4389 } 4390 4391 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4392 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4393 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4394 sysctl_jail_default_level, "I", 4395 "Processes in jail cannot see all mounted file systems (deprecated)"); 4396 4397 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4398 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4399 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4400 sysctl_jail_default_level, "I", 4401 "Ruleset for the devfs filesystem in jail (deprecated)"); 4402 4403 /* 4404 * Nodes to describe jail parameters. Maximum length of string parameters 4405 * is returned in the string itself, and the other parameters exist merely 4406 * to make themselves and their types known. 4407 */ 4408 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4409 "Jail parameters"); 4410 4411 int 4412 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4413 { 4414 int i; 4415 long l; 4416 size_t s; 4417 char numbuf[12]; 4418 4419 switch (oidp->oid_kind & CTLTYPE) 4420 { 4421 case CTLTYPE_LONG: 4422 case CTLTYPE_ULONG: 4423 l = 0; 4424 #ifdef SCTL_MASK32 4425 if (!(req->flags & SCTL_MASK32)) 4426 #endif 4427 return (SYSCTL_OUT(req, &l, sizeof(l))); 4428 case CTLTYPE_INT: 4429 case CTLTYPE_UINT: 4430 i = 0; 4431 return (SYSCTL_OUT(req, &i, sizeof(i))); 4432 case CTLTYPE_STRING: 4433 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4434 return 4435 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4436 case CTLTYPE_STRUCT: 4437 s = (size_t)arg2; 4438 return (SYSCTL_OUT(req, &s, sizeof(s))); 4439 } 4440 return (0); 4441 } 4442 4443 /* 4444 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 4445 * jail creation time but cannot be changed in an existing jail. 4446 */ 4447 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4448 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4449 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4450 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4451 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4452 "I", "Jail secure level"); 4453 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 4454 "Jail value for kern.osreldate and uname -K"); 4455 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 4456 "Jail value for kern.osrelease and uname -r"); 4457 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4458 "I", "Jail cannot see all mounted file systems"); 4459 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4460 "I", "Ruleset for in-jail devfs mounts"); 4461 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4462 "B", "Jail persistence"); 4463 #ifdef VIMAGE 4464 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4465 "E,jailsys", "Virtual network stack"); 4466 #endif 4467 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4468 "B", "Jail is in the process of shutting down"); 4469 4470 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4471 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4472 "I", "Current number of child jails"); 4473 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4474 "I", "Maximum number of child jails"); 4475 4476 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4477 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4478 "Jail hostname"); 4479 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4480 "Jail NIS domainname"); 4481 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4482 "Jail host UUID"); 4483 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4484 "LU", "Jail host ID"); 4485 4486 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4487 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4488 4489 #ifdef INET 4490 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4491 "Jail IPv4 address virtualization"); 4492 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4493 "S,in_addr,a", "Jail IPv4 addresses"); 4494 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4495 "B", "Do (not) use IPv4 source address selection rather than the " 4496 "primary jail IPv4 address."); 4497 #endif 4498 #ifdef INET6 4499 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4500 "Jail IPv6 address virtualization"); 4501 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4502 "S,in6_addr,a", "Jail IPv6 addresses"); 4503 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4504 "B", "Do (not) use IPv6 source address selection rather than the " 4505 "primary jail IPv6 address."); 4506 #endif 4507 4508 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4509 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4510 "B", "Jail may set hostname"); 4511 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4512 "B", "Jail may use SYSV IPC"); 4513 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4514 "B", "Jail may create raw sockets"); 4515 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4516 "B", "Jail may alter system file flags"); 4517 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4518 "B", "Jail may set file quotas"); 4519 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4520 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4521 4522 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4523 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4524 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4525 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 4526 "B", "Jail may mount the devfs file system"); 4527 SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW, 4528 "B", "Jail may mount the fdescfs file system"); 4529 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 4530 "B", "Jail may mount the nullfs file system"); 4531 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 4532 "B", "Jail may mount the procfs file system"); 4533 SYSCTL_JAIL_PARAM(_allow_mount, linprocfs, CTLTYPE_INT | CTLFLAG_RW, 4534 "B", "Jail may mount the linprocfs file system"); 4535 SYSCTL_JAIL_PARAM(_allow_mount, linsysfs, CTLTYPE_INT | CTLFLAG_RW, 4536 "B", "Jail may mount the linsysfs file system"); 4537 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW, 4538 "B", "Jail may mount the tmpfs file system"); 4539 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 4540 "B", "Jail may mount the zfs file system"); 4541 4542 #ifdef RACCT 4543 void 4544 prison_racct_foreach(void (*callback)(struct racct *racct, 4545 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 4546 void *arg2, void *arg3) 4547 { 4548 struct prison_racct *prr; 4549 4550 ASSERT_RACCT_ENABLED(); 4551 4552 sx_slock(&allprison_lock); 4553 if (pre != NULL) 4554 (pre)(); 4555 LIST_FOREACH(prr, &allprison_racct, prr_next) 4556 (callback)(prr->prr_racct, arg2, arg3); 4557 if (post != NULL) 4558 (post)(); 4559 sx_sunlock(&allprison_lock); 4560 } 4561 4562 static struct prison_racct * 4563 prison_racct_find_locked(const char *name) 4564 { 4565 struct prison_racct *prr; 4566 4567 ASSERT_RACCT_ENABLED(); 4568 sx_assert(&allprison_lock, SA_XLOCKED); 4569 4570 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4571 return (NULL); 4572 4573 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4574 if (strcmp(name, prr->prr_name) != 0) 4575 continue; 4576 4577 /* Found prison_racct with a matching name? */ 4578 prison_racct_hold(prr); 4579 return (prr); 4580 } 4581 4582 /* Add new prison_racct. */ 4583 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4584 racct_create(&prr->prr_racct); 4585 4586 strcpy(prr->prr_name, name); 4587 refcount_init(&prr->prr_refcount, 1); 4588 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4589 4590 return (prr); 4591 } 4592 4593 struct prison_racct * 4594 prison_racct_find(const char *name) 4595 { 4596 struct prison_racct *prr; 4597 4598 ASSERT_RACCT_ENABLED(); 4599 4600 sx_xlock(&allprison_lock); 4601 prr = prison_racct_find_locked(name); 4602 sx_xunlock(&allprison_lock); 4603 return (prr); 4604 } 4605 4606 void 4607 prison_racct_hold(struct prison_racct *prr) 4608 { 4609 4610 ASSERT_RACCT_ENABLED(); 4611 4612 refcount_acquire(&prr->prr_refcount); 4613 } 4614 4615 static void 4616 prison_racct_free_locked(struct prison_racct *prr) 4617 { 4618 4619 ASSERT_RACCT_ENABLED(); 4620 sx_assert(&allprison_lock, SA_XLOCKED); 4621 4622 if (refcount_release(&prr->prr_refcount)) { 4623 racct_destroy(&prr->prr_racct); 4624 LIST_REMOVE(prr, prr_next); 4625 free(prr, M_PRISON_RACCT); 4626 } 4627 } 4628 4629 void 4630 prison_racct_free(struct prison_racct *prr) 4631 { 4632 int old; 4633 4634 ASSERT_RACCT_ENABLED(); 4635 sx_assert(&allprison_lock, SA_UNLOCKED); 4636 4637 old = prr->prr_refcount; 4638 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4639 return; 4640 4641 sx_xlock(&allprison_lock); 4642 prison_racct_free_locked(prr); 4643 sx_xunlock(&allprison_lock); 4644 } 4645 4646 static void 4647 prison_racct_attach(struct prison *pr) 4648 { 4649 struct prison_racct *prr; 4650 4651 ASSERT_RACCT_ENABLED(); 4652 sx_assert(&allprison_lock, SA_XLOCKED); 4653 4654 prr = prison_racct_find_locked(pr->pr_name); 4655 KASSERT(prr != NULL, ("cannot find prison_racct")); 4656 4657 pr->pr_prison_racct = prr; 4658 } 4659 4660 /* 4661 * Handle jail renaming. From the racct point of view, renaming means 4662 * moving from one prison_racct to another. 4663 */ 4664 static void 4665 prison_racct_modify(struct prison *pr) 4666 { 4667 struct proc *p; 4668 struct ucred *cred; 4669 struct prison_racct *oldprr; 4670 4671 ASSERT_RACCT_ENABLED(); 4672 4673 sx_slock(&allproc_lock); 4674 sx_xlock(&allprison_lock); 4675 4676 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4677 sx_xunlock(&allprison_lock); 4678 sx_sunlock(&allproc_lock); 4679 return; 4680 } 4681 4682 oldprr = pr->pr_prison_racct; 4683 pr->pr_prison_racct = NULL; 4684 4685 prison_racct_attach(pr); 4686 4687 /* 4688 * Move resource utilisation records. 4689 */ 4690 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4691 4692 /* 4693 * Force rctl to reattach rules to processes. 4694 */ 4695 FOREACH_PROC_IN_SYSTEM(p) { 4696 PROC_LOCK(p); 4697 cred = crhold(p->p_ucred); 4698 PROC_UNLOCK(p); 4699 racct_proc_ucred_changed(p, cred, cred); 4700 crfree(cred); 4701 } 4702 4703 sx_sunlock(&allproc_lock); 4704 prison_racct_free_locked(oldprr); 4705 sx_xunlock(&allprison_lock); 4706 } 4707 4708 static void 4709 prison_racct_detach(struct prison *pr) 4710 { 4711 4712 ASSERT_RACCT_ENABLED(); 4713 sx_assert(&allprison_lock, SA_UNLOCKED); 4714 4715 if (pr->pr_prison_racct == NULL) 4716 return; 4717 prison_racct_free(pr->pr_prison_racct); 4718 pr->pr_prison_racct = NULL; 4719 } 4720 #endif /* RACCT */ 4721 4722 #ifdef DDB 4723 4724 static void 4725 db_show_prison(struct prison *pr) 4726 { 4727 int fi; 4728 #if defined(INET) || defined(INET6) 4729 int ii; 4730 #endif 4731 unsigned jsf; 4732 #ifdef INET6 4733 char ip6buf[INET6_ADDRSTRLEN]; 4734 #endif 4735 4736 db_printf("prison %p:\n", pr); 4737 db_printf(" jid = %d\n", pr->pr_id); 4738 db_printf(" name = %s\n", pr->pr_name); 4739 db_printf(" parent = %p\n", pr->pr_parent); 4740 db_printf(" ref = %d\n", pr->pr_ref); 4741 db_printf(" uref = %d\n", pr->pr_uref); 4742 db_printf(" path = %s\n", pr->pr_path); 4743 db_printf(" cpuset = %d\n", pr->pr_cpuset 4744 ? pr->pr_cpuset->cs_id : -1); 4745 #ifdef VIMAGE 4746 db_printf(" vnet = %p\n", pr->pr_vnet); 4747 #endif 4748 db_printf(" root = %p\n", pr->pr_root); 4749 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4750 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4751 db_printf(" children.max = %d\n", pr->pr_childmax); 4752 db_printf(" children.cur = %d\n", pr->pr_childcount); 4753 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4754 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4755 db_printf(" flags = 0x%x", pr->pr_flags); 4756 for (fi = 0; fi < nitems(pr_flag_names); fi++) 4757 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4758 db_printf(" %s", pr_flag_names[fi]); 4759 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) { 4760 jsf = pr->pr_flags & 4761 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4762 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4763 pr_flag_jailsys[fi].disable && 4764 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4765 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4766 : "inherit"); 4767 } 4768 db_printf(" allow = 0x%x", pr->pr_allow); 4769 for (fi = 0; fi < nitems(pr_allow_names); fi++) 4770 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4771 db_printf(" %s", pr_allow_names[fi]); 4772 db_printf("\n"); 4773 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4774 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4775 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4776 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4777 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4778 #ifdef INET 4779 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4780 for (ii = 0; ii < pr->pr_ip4s; ii++) 4781 db_printf(" %s %s\n", 4782 ii == 0 ? "ip4.addr =" : " ", 4783 inet_ntoa(pr->pr_ip4[ii])); 4784 #endif 4785 #ifdef INET6 4786 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4787 for (ii = 0; ii < pr->pr_ip6s; ii++) 4788 db_printf(" %s %s\n", 4789 ii == 0 ? "ip6.addr =" : " ", 4790 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4791 #endif 4792 } 4793 4794 DB_SHOW_COMMAND(prison, db_show_prison_command) 4795 { 4796 struct prison *pr; 4797 4798 if (!have_addr) { 4799 /* 4800 * Show all prisons in the list, and prison0 which is not 4801 * listed. 4802 */ 4803 db_show_prison(&prison0); 4804 if (!db_pager_quit) { 4805 TAILQ_FOREACH(pr, &allprison, pr_list) { 4806 db_show_prison(pr); 4807 if (db_pager_quit) 4808 break; 4809 } 4810 } 4811 return; 4812 } 4813 4814 if (addr == 0) 4815 pr = &prison0; 4816 else { 4817 /* Look for a prison with the ID and with references. */ 4818 TAILQ_FOREACH(pr, &allprison, pr_list) 4819 if (pr->pr_id == addr && pr->pr_ref > 0) 4820 break; 4821 if (pr == NULL) 4822 /* Look again, without requiring a reference. */ 4823 TAILQ_FOREACH(pr, &allprison, pr_list) 4824 if (pr->pr_id == addr) 4825 break; 4826 if (pr == NULL) 4827 /* Assume address points to a valid prison. */ 4828 pr = (struct prison *)addr; 4829 } 4830 db_show_prison(pr); 4831 } 4832 4833 #endif /* DDB */
Cache object: e3d3b8406d547a16c5e415a7789284d9
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