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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/10.4/sys/kern/kern_jail.c 302234 2016-06-27 21:50:30Z bdrewery $"); 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 #ifdef INET6 72 #include <netinet6/in6_var.h> 73 #endif /* INET6 */ 74 #endif /* DDB */ 75 76 #include <security/mac/mac_framework.h> 77 78 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 79 80 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 81 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 82 83 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 84 #ifdef INET 85 #ifdef INET6 86 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 87 #else 88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 89 #endif 90 #else /* !INET */ 91 #ifdef INET6 92 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 93 #else 94 #define _PR_IP_SADDRSEL 0 95 #endif 96 #endif 97 98 /* prison0 describes what is "real" about the system. */ 99 struct prison prison0 = { 100 .pr_id = 0, 101 .pr_name = "", 102 .pr_ref = 1, 103 .pr_uref = 1, 104 .pr_path = "/", 105 .pr_securelevel = -1, 106 .pr_devfs_rsnum = 0, 107 .pr_childmax = JAIL_MAX, 108 .pr_hostuuid = DEFAULT_HOSTUUID, 109 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 110 #ifdef VIMAGE 111 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 112 #else 113 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 114 #endif 115 .pr_allow = PR_ALLOW_ALL, 116 }; 117 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 118 119 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 120 struct sx allprison_lock; 121 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 122 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 123 LIST_HEAD(, prison_racct) allprison_racct; 124 int lastprid = 0; 125 126 static int do_jail_attach(struct thread *td, struct prison *pr); 127 static void prison_complete(void *context, int pending); 128 static void prison_deref(struct prison *pr, int flags); 129 static char *prison_path(struct prison *pr1, struct prison *pr2); 130 static void prison_remove_one(struct prison *pr); 131 #ifdef RACCT 132 static void prison_racct_attach(struct prison *pr); 133 static void prison_racct_modify(struct prison *pr); 134 static void prison_racct_detach(struct prison *pr); 135 #endif 136 #ifdef INET 137 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia); 138 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4); 139 #endif 140 #ifdef INET6 141 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6); 142 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6); 143 #endif 144 145 /* Flags for prison_deref */ 146 #define PD_DEREF 0x01 147 #define PD_DEUREF 0x02 148 #define PD_LOCKED 0x04 149 #define PD_LIST_SLOCKED 0x08 150 #define PD_LIST_XLOCKED 0x10 151 152 /* 153 * Parameter names corresponding to PR_* flag values. Size values are for kvm 154 * as we cannot figure out the size of a sparse array, or an array without a 155 * terminating entry. 156 */ 157 static char *pr_flag_names[] = { 158 [0] = "persist", 159 #ifdef INET 160 [7] = "ip4.saddrsel", 161 #endif 162 #ifdef INET6 163 [8] = "ip6.saddrsel", 164 #endif 165 }; 166 const size_t pr_flag_names_size = sizeof(pr_flag_names); 167 168 static char *pr_flag_nonames[] = { 169 [0] = "nopersist", 170 #ifdef INET 171 [7] = "ip4.nosaddrsel", 172 #endif 173 #ifdef INET6 174 [8] = "ip6.nosaddrsel", 175 #endif 176 }; 177 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames); 178 179 struct jailsys_flags { 180 const char *name; 181 unsigned disable; 182 unsigned new; 183 } pr_flag_jailsys[] = { 184 { "host", 0, PR_HOST }, 185 #ifdef VIMAGE 186 { "vnet", 0, PR_VNET }, 187 #endif 188 #ifdef INET 189 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER }, 190 #endif 191 #ifdef INET6 192 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER }, 193 #endif 194 }; 195 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 196 197 static char *pr_allow_names[] = { 198 "allow.set_hostname", 199 "allow.sysvipc", 200 "allow.raw_sockets", 201 "allow.chflags", 202 "allow.mount", 203 "allow.quotas", 204 "allow.socket_af", 205 "allow.mount.devfs", 206 "allow.mount.nullfs", 207 "allow.mount.zfs", 208 "allow.mount.procfs", 209 "allow.mount.tmpfs", 210 "allow.mount.fdescfs", 211 "allow.mount.linprocfs", 212 "allow.mount.linsysfs", 213 }; 214 const size_t pr_allow_names_size = sizeof(pr_allow_names); 215 216 static char *pr_allow_nonames[] = { 217 "allow.noset_hostname", 218 "allow.nosysvipc", 219 "allow.noraw_sockets", 220 "allow.nochflags", 221 "allow.nomount", 222 "allow.noquotas", 223 "allow.nosocket_af", 224 "allow.mount.nodevfs", 225 "allow.mount.nonullfs", 226 "allow.mount.nozfs", 227 "allow.mount.noprocfs", 228 "allow.mount.notmpfs", 229 "allow.mount.nofdescfs", 230 "allow.mount.nolinprocfs", 231 "allow.mount.nolinsysfs", 232 }; 233 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames); 234 235 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 236 #define JAIL_DEFAULT_ENFORCE_STATFS 2 237 #define JAIL_DEFAULT_DEVFS_RSNUM 0 238 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 239 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 240 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 241 #if defined(INET) || defined(INET6) 242 static unsigned jail_max_af_ips = 255; 243 #endif 244 245 /* 246 * Initialize the parts of prison0 that can't be static-initialized with 247 * constants. This is called from proc0_init() after creating thread0 cpuset. 248 */ 249 void 250 prison0_init(void) 251 { 252 253 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 254 prison0.pr_osreldate = osreldate; 255 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 256 } 257 258 #ifdef INET 259 static int 260 qcmp_v4(const void *ip1, const void *ip2) 261 { 262 in_addr_t iaa, iab; 263 264 /* 265 * We need to compare in HBO here to get the list sorted as expected 266 * by the result of the code. Sorting NBO addresses gives you 267 * interesting results. If you do not understand, do not try. 268 */ 269 iaa = ntohl(((const struct in_addr *)ip1)->s_addr); 270 iab = ntohl(((const struct in_addr *)ip2)->s_addr); 271 272 /* 273 * Do not simply return the difference of the two numbers, the int is 274 * not wide enough. 275 */ 276 if (iaa > iab) 277 return (1); 278 else if (iaa < iab) 279 return (-1); 280 else 281 return (0); 282 } 283 #endif 284 285 #ifdef INET6 286 static int 287 qcmp_v6(const void *ip1, const void *ip2) 288 { 289 const struct in6_addr *ia6a, *ia6b; 290 int i, rc; 291 292 ia6a = (const struct in6_addr *)ip1; 293 ia6b = (const struct in6_addr *)ip2; 294 295 rc = 0; 296 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 297 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 298 rc = 1; 299 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 300 rc = -1; 301 } 302 return (rc); 303 } 304 #endif 305 306 /* 307 * struct jail_args { 308 * struct jail *jail; 309 * }; 310 */ 311 int 312 sys_jail(struct thread *td, struct jail_args *uap) 313 { 314 uint32_t version; 315 int error; 316 struct jail j; 317 318 error = copyin(uap->jail, &version, sizeof(uint32_t)); 319 if (error) 320 return (error); 321 322 switch (version) { 323 case 0: 324 { 325 struct jail_v0 j0; 326 327 /* FreeBSD single IPv4 jails. */ 328 bzero(&j, sizeof(struct jail)); 329 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 330 if (error) 331 return (error); 332 j.version = j0.version; 333 j.path = j0.path; 334 j.hostname = j0.hostname; 335 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 336 break; 337 } 338 339 case 1: 340 /* 341 * Version 1 was used by multi-IPv4 jail implementations 342 * that never made it into the official kernel. 343 */ 344 return (EINVAL); 345 346 case 2: /* JAIL_API_VERSION */ 347 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 348 error = copyin(uap->jail, &j, sizeof(struct jail)); 349 if (error) 350 return (error); 351 break; 352 353 default: 354 /* Sci-Fi jails are not supported, sorry. */ 355 return (EINVAL); 356 } 357 return (kern_jail(td, &j)); 358 } 359 360 int 361 kern_jail(struct thread *td, struct jail *j) 362 { 363 struct iovec optiov[2 * (4 364 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0]) 365 #ifdef INET 366 + 1 367 #endif 368 #ifdef INET6 369 + 1 370 #endif 371 )]; 372 struct uio opt; 373 char *u_path, *u_hostname, *u_name; 374 #ifdef INET 375 uint32_t ip4s; 376 struct in_addr *u_ip4; 377 #endif 378 #ifdef INET6 379 struct in6_addr *u_ip6; 380 #endif 381 size_t tmplen; 382 int error, enforce_statfs, fi; 383 384 bzero(&optiov, sizeof(optiov)); 385 opt.uio_iov = optiov; 386 opt.uio_iovcnt = 0; 387 opt.uio_offset = -1; 388 opt.uio_resid = -1; 389 opt.uio_segflg = UIO_SYSSPACE; 390 opt.uio_rw = UIO_READ; 391 opt.uio_td = td; 392 393 /* Set permissions for top-level jails from sysctls. */ 394 if (!jailed(td->td_ucred)) { 395 for (fi = 0; fi < sizeof(pr_allow_names) / 396 sizeof(pr_allow_names[0]); fi++) { 397 optiov[opt.uio_iovcnt].iov_base = 398 (jail_default_allow & (1 << fi)) 399 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 400 optiov[opt.uio_iovcnt].iov_len = 401 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 402 opt.uio_iovcnt += 2; 403 } 404 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 405 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 406 opt.uio_iovcnt++; 407 enforce_statfs = jail_default_enforce_statfs; 408 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 409 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 410 opt.uio_iovcnt++; 411 } 412 413 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 414 #ifdef INET 415 ip4s = (j->version == 0) ? 1 : j->ip4s; 416 if (ip4s > jail_max_af_ips) 417 return (EINVAL); 418 tmplen += ip4s * sizeof(struct in_addr); 419 #else 420 if (j->ip4s > 0) 421 return (EINVAL); 422 #endif 423 #ifdef INET6 424 if (j->ip6s > jail_max_af_ips) 425 return (EINVAL); 426 tmplen += j->ip6s * sizeof(struct in6_addr); 427 #else 428 if (j->ip6s > 0) 429 return (EINVAL); 430 #endif 431 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 432 u_hostname = u_path + MAXPATHLEN; 433 u_name = u_hostname + MAXHOSTNAMELEN; 434 #ifdef INET 435 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 436 #endif 437 #ifdef INET6 438 #ifdef INET 439 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 440 #else 441 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 442 #endif 443 #endif 444 optiov[opt.uio_iovcnt].iov_base = "path"; 445 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 446 opt.uio_iovcnt++; 447 optiov[opt.uio_iovcnt].iov_base = u_path; 448 error = copyinstr(j->path, u_path, MAXPATHLEN, 449 &optiov[opt.uio_iovcnt].iov_len); 450 if (error) { 451 free(u_path, M_TEMP); 452 return (error); 453 } 454 opt.uio_iovcnt++; 455 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 456 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 457 opt.uio_iovcnt++; 458 optiov[opt.uio_iovcnt].iov_base = u_hostname; 459 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 460 &optiov[opt.uio_iovcnt].iov_len); 461 if (error) { 462 free(u_path, M_TEMP); 463 return (error); 464 } 465 opt.uio_iovcnt++; 466 if (j->jailname != NULL) { 467 optiov[opt.uio_iovcnt].iov_base = "name"; 468 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 469 opt.uio_iovcnt++; 470 optiov[opt.uio_iovcnt].iov_base = u_name; 471 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 472 &optiov[opt.uio_iovcnt].iov_len); 473 if (error) { 474 free(u_path, M_TEMP); 475 return (error); 476 } 477 opt.uio_iovcnt++; 478 } 479 #ifdef INET 480 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 481 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 482 opt.uio_iovcnt++; 483 optiov[opt.uio_iovcnt].iov_base = u_ip4; 484 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 485 if (j->version == 0) 486 u_ip4->s_addr = j->ip4s; 487 else { 488 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 489 if (error) { 490 free(u_path, M_TEMP); 491 return (error); 492 } 493 } 494 opt.uio_iovcnt++; 495 #endif 496 #ifdef INET6 497 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 498 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 499 opt.uio_iovcnt++; 500 optiov[opt.uio_iovcnt].iov_base = u_ip6; 501 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 502 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 503 if (error) { 504 free(u_path, M_TEMP); 505 return (error); 506 } 507 opt.uio_iovcnt++; 508 #endif 509 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]), 510 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 511 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 512 free(u_path, M_TEMP); 513 return (error); 514 } 515 516 517 /* 518 * struct jail_set_args { 519 * struct iovec *iovp; 520 * unsigned int iovcnt; 521 * int flags; 522 * }; 523 */ 524 int 525 sys_jail_set(struct thread *td, struct jail_set_args *uap) 526 { 527 struct uio *auio; 528 int error; 529 530 /* Check that we have an even number of iovecs. */ 531 if (uap->iovcnt & 1) 532 return (EINVAL); 533 534 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 535 if (error) 536 return (error); 537 error = kern_jail_set(td, auio, uap->flags); 538 free(auio, M_IOV); 539 return (error); 540 } 541 542 int 543 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 544 { 545 struct nameidata nd; 546 #ifdef INET 547 struct in_addr *ip4; 548 #endif 549 #ifdef INET6 550 struct in6_addr *ip6; 551 #endif 552 struct vfsopt *opt; 553 struct vfsoptlist *opts; 554 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 555 struct vnode *root; 556 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 557 char *g_path, *osrelstr; 558 #if defined(INET) || defined(INET6) 559 struct prison *tppr; 560 void *op; 561 #endif 562 unsigned long hid; 563 size_t namelen, onamelen, pnamelen; 564 int born, created, cuflags, descend, enforce; 565 int error, errmsg_len, errmsg_pos; 566 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 567 int fi, jid, jsys, len, level; 568 int childmax, osreldt, rsnum, slevel; 569 int fullpath_disabled; 570 #if defined(INET) || defined(INET6) 571 int ii, ij; 572 #endif 573 #ifdef INET 574 int ip4s, redo_ip4; 575 #endif 576 #ifdef INET6 577 int ip6s, redo_ip6; 578 #endif 579 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 580 unsigned tallow; 581 char numbuf[12]; 582 583 error = priv_check(td, PRIV_JAIL_SET); 584 if (!error && (flags & JAIL_ATTACH)) 585 error = priv_check(td, PRIV_JAIL_ATTACH); 586 if (error) 587 return (error); 588 mypr = td->td_ucred->cr_prison; 589 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 590 return (EPERM); 591 if (flags & ~JAIL_SET_MASK) 592 return (EINVAL); 593 594 /* 595 * Check all the parameters before committing to anything. Not all 596 * errors can be caught early, but we may as well try. Also, this 597 * takes care of some expensive stuff (path lookup) before getting 598 * the allprison lock. 599 * 600 * XXX Jails are not filesystems, and jail parameters are not mount 601 * options. But it makes more sense to re-use the vfsopt code 602 * than duplicate it under a different name. 603 */ 604 error = vfs_buildopts(optuio, &opts); 605 if (error) 606 return (error); 607 #ifdef INET 608 ip4 = NULL; 609 #endif 610 #ifdef INET6 611 ip6 = NULL; 612 #endif 613 g_path = NULL; 614 615 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 616 if (!cuflags) { 617 error = EINVAL; 618 vfs_opterror(opts, "no valid operation (create or update)"); 619 goto done_errmsg; 620 } 621 622 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 623 if (error == ENOENT) 624 jid = 0; 625 else if (error != 0) 626 goto done_free; 627 628 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 629 if (error == ENOENT) 630 gotslevel = 0; 631 else if (error != 0) 632 goto done_free; 633 else 634 gotslevel = 1; 635 636 error = 637 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 638 if (error == ENOENT) 639 gotchildmax = 0; 640 else if (error != 0) 641 goto done_free; 642 else 643 gotchildmax = 1; 644 645 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 646 if (error == ENOENT) 647 gotenforce = 0; 648 else if (error != 0) 649 goto done_free; 650 else if (enforce < 0 || enforce > 2) { 651 error = EINVAL; 652 goto done_free; 653 } else 654 gotenforce = 1; 655 656 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 657 if (error == ENOENT) 658 gotrsnum = 0; 659 else if (error != 0) 660 goto done_free; 661 else 662 gotrsnum = 1; 663 664 pr_flags = ch_flags = 0; 665 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 666 fi++) { 667 if (pr_flag_names[fi] == NULL) 668 continue; 669 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 670 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 671 } 672 ch_flags |= pr_flags; 673 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 674 fi++) { 675 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 676 sizeof(jsys)); 677 if (error == ENOENT) 678 continue; 679 if (error != 0) 680 goto done_free; 681 switch (jsys) { 682 case JAIL_SYS_DISABLE: 683 if (!pr_flag_jailsys[fi].disable) { 684 error = EINVAL; 685 goto done_free; 686 } 687 pr_flags |= pr_flag_jailsys[fi].disable; 688 break; 689 case JAIL_SYS_NEW: 690 pr_flags |= pr_flag_jailsys[fi].new; 691 break; 692 case JAIL_SYS_INHERIT: 693 break; 694 default: 695 error = EINVAL; 696 goto done_free; 697 } 698 ch_flags |= 699 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 700 } 701 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 702 && !(pr_flags & PR_PERSIST)) { 703 error = EINVAL; 704 vfs_opterror(opts, "new jail must persist or attach"); 705 goto done_errmsg; 706 } 707 #ifdef VIMAGE 708 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 709 error = EINVAL; 710 vfs_opterror(opts, "vnet cannot be changed after creation"); 711 goto done_errmsg; 712 } 713 #endif 714 #ifdef INET 715 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 716 error = EINVAL; 717 vfs_opterror(opts, "ip4 cannot be changed after creation"); 718 goto done_errmsg; 719 } 720 #endif 721 #ifdef INET6 722 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 723 error = EINVAL; 724 vfs_opterror(opts, "ip6 cannot be changed after creation"); 725 goto done_errmsg; 726 } 727 #endif 728 729 pr_allow = ch_allow = 0; 730 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 731 fi++) { 732 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 733 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 734 } 735 ch_allow |= pr_allow; 736 737 error = vfs_getopt(opts, "name", (void **)&name, &len); 738 if (error == ENOENT) 739 name = NULL; 740 else if (error != 0) 741 goto done_free; 742 else { 743 if (len == 0 || name[len - 1] != '\0') { 744 error = EINVAL; 745 goto done_free; 746 } 747 if (len > MAXHOSTNAMELEN) { 748 error = ENAMETOOLONG; 749 goto done_free; 750 } 751 } 752 753 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 754 if (error == ENOENT) 755 host = NULL; 756 else if (error != 0) 757 goto done_free; 758 else { 759 ch_flags |= PR_HOST; 760 pr_flags |= PR_HOST; 761 if (len == 0 || host[len - 1] != '\0') { 762 error = EINVAL; 763 goto done_free; 764 } 765 if (len > MAXHOSTNAMELEN) { 766 error = ENAMETOOLONG; 767 goto done_free; 768 } 769 } 770 771 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 772 if (error == ENOENT) 773 domain = NULL; 774 else if (error != 0) 775 goto done_free; 776 else { 777 ch_flags |= PR_HOST; 778 pr_flags |= PR_HOST; 779 if (len == 0 || domain[len - 1] != '\0') { 780 error = EINVAL; 781 goto done_free; 782 } 783 if (len > MAXHOSTNAMELEN) { 784 error = ENAMETOOLONG; 785 goto done_free; 786 } 787 } 788 789 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 790 if (error == ENOENT) 791 uuid = NULL; 792 else if (error != 0) 793 goto done_free; 794 else { 795 ch_flags |= PR_HOST; 796 pr_flags |= PR_HOST; 797 if (len == 0 || uuid[len - 1] != '\0') { 798 error = EINVAL; 799 goto done_free; 800 } 801 if (len > HOSTUUIDLEN) { 802 error = ENAMETOOLONG; 803 goto done_free; 804 } 805 } 806 807 #ifdef COMPAT_FREEBSD32 808 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 809 uint32_t hid32; 810 811 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 812 hid = hid32; 813 } else 814 #endif 815 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 816 if (error == ENOENT) 817 gothid = 0; 818 else if (error != 0) 819 goto done_free; 820 else { 821 gothid = 1; 822 ch_flags |= PR_HOST; 823 pr_flags |= PR_HOST; 824 } 825 826 #ifdef INET 827 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 828 if (error == ENOENT) 829 ip4s = 0; 830 else if (error != 0) 831 goto done_free; 832 else if (ip4s & (sizeof(*ip4) - 1)) { 833 error = EINVAL; 834 goto done_free; 835 } else { 836 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE; 837 if (ip4s == 0) 838 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE; 839 else { 840 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER; 841 ip4s /= sizeof(*ip4); 842 if (ip4s > jail_max_af_ips) { 843 error = EINVAL; 844 vfs_opterror(opts, "too many IPv4 addresses"); 845 goto done_errmsg; 846 } 847 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 848 bcopy(op, ip4, ip4s * sizeof(*ip4)); 849 /* 850 * IP addresses are all sorted but ip[0] to preserve 851 * the primary IP address as given from userland. 852 * This special IP is used for unbound outgoing 853 * connections as well for "loopback" traffic in case 854 * source address selection cannot find any more fitting 855 * address to connect from. 856 */ 857 if (ip4s > 1) 858 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4); 859 /* 860 * Check for duplicate addresses and do some simple 861 * zero and broadcast checks. If users give other bogus 862 * addresses it is their problem. 863 * 864 * We do not have to care about byte order for these 865 * checks so we will do them in NBO. 866 */ 867 for (ii = 0; ii < ip4s; ii++) { 868 if (ip4[ii].s_addr == INADDR_ANY || 869 ip4[ii].s_addr == INADDR_BROADCAST) { 870 error = EINVAL; 871 goto done_free; 872 } 873 if ((ii+1) < ip4s && 874 (ip4[0].s_addr == ip4[ii+1].s_addr || 875 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 876 error = EINVAL; 877 goto done_free; 878 } 879 } 880 } 881 } 882 #endif 883 884 #ifdef INET6 885 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 886 if (error == ENOENT) 887 ip6s = 0; 888 else if (error != 0) 889 goto done_free; 890 else if (ip6s & (sizeof(*ip6) - 1)) { 891 error = EINVAL; 892 goto done_free; 893 } else { 894 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE; 895 if (ip6s == 0) 896 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE; 897 else { 898 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER; 899 ip6s /= sizeof(*ip6); 900 if (ip6s > jail_max_af_ips) { 901 error = EINVAL; 902 vfs_opterror(opts, "too many IPv6 addresses"); 903 goto done_errmsg; 904 } 905 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 906 bcopy(op, ip6, ip6s * sizeof(*ip6)); 907 if (ip6s > 1) 908 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6); 909 for (ii = 0; ii < ip6s; ii++) { 910 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 911 error = EINVAL; 912 goto done_free; 913 } 914 if ((ii+1) < ip6s && 915 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 916 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 917 { 918 error = EINVAL; 919 goto done_free; 920 } 921 } 922 } 923 } 924 #endif 925 926 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 927 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 928 error = EINVAL; 929 vfs_opterror(opts, 930 "vnet jails cannot have IP address restrictions"); 931 goto done_errmsg; 932 } 933 #endif 934 935 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 936 if (error == ENOENT) 937 osrelstr = NULL; 938 else if (error != 0) 939 goto done_free; 940 else { 941 if (flags & JAIL_UPDATE) { 942 error = EINVAL; 943 vfs_opterror(opts, 944 "osrelease cannot be changed after creation"); 945 goto done_errmsg; 946 } 947 if (len == 0 || len >= OSRELEASELEN) { 948 error = EINVAL; 949 vfs_opterror(opts, 950 "osrelease string must be 1-%d bytes long", 951 OSRELEASELEN - 1); 952 goto done_errmsg; 953 } 954 } 955 956 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 957 if (error == ENOENT) 958 osreldt = 0; 959 else if (error != 0) 960 goto done_free; 961 else { 962 if (flags & JAIL_UPDATE) { 963 error = EINVAL; 964 vfs_opterror(opts, 965 "osreldate cannot be changed after creation"); 966 goto done_errmsg; 967 } 968 if (osreldt == 0) { 969 error = EINVAL; 970 vfs_opterror(opts, "osreldate cannot be 0"); 971 goto done_errmsg; 972 } 973 } 974 975 fullpath_disabled = 0; 976 root = NULL; 977 error = vfs_getopt(opts, "path", (void **)&path, &len); 978 if (error == ENOENT) 979 path = NULL; 980 else if (error != 0) 981 goto done_free; 982 else { 983 if (flags & JAIL_UPDATE) { 984 error = EINVAL; 985 vfs_opterror(opts, 986 "path cannot be changed after creation"); 987 goto done_errmsg; 988 } 989 if (len == 0 || path[len - 1] != '\0') { 990 error = EINVAL; 991 goto done_free; 992 } 993 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 994 path, td); 995 error = namei(&nd); 996 if (error) 997 goto done_free; 998 root = nd.ni_vp; 999 NDFREE(&nd, NDF_ONLY_PNBUF); 1000 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1001 strlcpy(g_path, path, MAXPATHLEN); 1002 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 1003 if (error == 0) 1004 path = g_path; 1005 else if (error == ENODEV) { 1006 /* proceed if sysctl debug.disablefullpath == 1 */ 1007 fullpath_disabled = 1; 1008 if (len < 2 || (len == 2 && path[0] == '/')) 1009 path = NULL; 1010 } else { 1011 /* exit on other errors */ 1012 goto done_free; 1013 } 1014 if (root->v_type != VDIR) { 1015 error = ENOTDIR; 1016 vput(root); 1017 goto done_free; 1018 } 1019 VOP_UNLOCK(root, 0); 1020 if (fullpath_disabled) { 1021 /* Leave room for a real-root full pathname. */ 1022 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 1023 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 1024 error = ENAMETOOLONG; 1025 vrele(root); 1026 goto done_free; 1027 } 1028 } 1029 } 1030 1031 /* 1032 * Find the specified jail, or at least its parent. 1033 * This abuses the file error codes ENOENT and EEXIST. 1034 */ 1035 pr = NULL; 1036 ppr = mypr; 1037 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 1038 namelc = strrchr(name, '.'); 1039 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 1040 if (*p != '\0') 1041 jid = 0; 1042 } 1043 sx_xlock(&allprison_lock); 1044 if (jid != 0) { 1045 /* 1046 * See if a requested jid already exists. There is an 1047 * information leak here if the jid exists but is not within 1048 * the caller's jail hierarchy. Jail creators will get EEXIST 1049 * even though they cannot see the jail, and CREATE | UPDATE 1050 * will return ENOENT which is not normally a valid error. 1051 */ 1052 if (jid < 0) { 1053 error = EINVAL; 1054 vfs_opterror(opts, "negative jid"); 1055 goto done_unlock_list; 1056 } 1057 pr = prison_find(jid); 1058 if (pr != NULL) { 1059 ppr = pr->pr_parent; 1060 /* Create: jid must not exist. */ 1061 if (cuflags == JAIL_CREATE) { 1062 mtx_unlock(&pr->pr_mtx); 1063 error = EEXIST; 1064 vfs_opterror(opts, "jail %d already exists", 1065 jid); 1066 goto done_unlock_list; 1067 } 1068 if (!prison_ischild(mypr, pr)) { 1069 mtx_unlock(&pr->pr_mtx); 1070 pr = NULL; 1071 } else if (pr->pr_uref == 0) { 1072 if (!(flags & JAIL_DYING)) { 1073 mtx_unlock(&pr->pr_mtx); 1074 error = ENOENT; 1075 vfs_opterror(opts, "jail %d is dying", 1076 jid); 1077 goto done_unlock_list; 1078 } else if ((flags & JAIL_ATTACH) || 1079 (pr_flags & PR_PERSIST)) { 1080 /* 1081 * A dying jail might be resurrected 1082 * (via attach or persist), but first 1083 * it must determine if another jail 1084 * has claimed its name. Accomplish 1085 * this by implicitly re-setting the 1086 * name. 1087 */ 1088 if (name == NULL) 1089 name = prison_name(mypr, pr); 1090 } 1091 } 1092 } 1093 if (pr == NULL) { 1094 /* Update: jid must exist. */ 1095 if (cuflags == JAIL_UPDATE) { 1096 error = ENOENT; 1097 vfs_opterror(opts, "jail %d not found", jid); 1098 goto done_unlock_list; 1099 } 1100 } 1101 } 1102 /* 1103 * If the caller provided a name, look for a jail by that name. 1104 * This has different semantics for creates and updates keyed by jid 1105 * (where the name must not already exist in a different jail), 1106 * and updates keyed by the name itself (where the name must exist 1107 * because that is the jail being updated). 1108 */ 1109 namelc = NULL; 1110 if (name != NULL) { 1111 namelc = strrchr(name, '.'); 1112 if (namelc == NULL) 1113 namelc = name; 1114 else { 1115 /* 1116 * This is a hierarchical name. Split it into the 1117 * parent and child names, and make sure the parent 1118 * exists or matches an already found jail. 1119 */ 1120 if (pr != NULL) { 1121 if (strncmp(name, ppr->pr_name, namelc - name) 1122 || ppr->pr_name[namelc - name] != '\0') { 1123 mtx_unlock(&pr->pr_mtx); 1124 error = EINVAL; 1125 vfs_opterror(opts, 1126 "cannot change jail's parent"); 1127 goto done_unlock_list; 1128 } 1129 } else { 1130 *namelc = '\0'; 1131 ppr = prison_find_name(mypr, name); 1132 if (ppr == NULL) { 1133 error = ENOENT; 1134 vfs_opterror(opts, 1135 "jail \"%s\" not found", name); 1136 goto done_unlock_list; 1137 } 1138 mtx_unlock(&ppr->pr_mtx); 1139 *namelc = '.'; 1140 } 1141 namelc++; 1142 } 1143 if (namelc[0] != '\0') { 1144 pnamelen = 1145 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1146 name_again: 1147 deadpr = NULL; 1148 FOREACH_PRISON_CHILD(ppr, tpr) { 1149 if (tpr != pr && tpr->pr_ref > 0 && 1150 !strcmp(tpr->pr_name + pnamelen, namelc)) { 1151 if (pr == NULL && 1152 cuflags != JAIL_CREATE) { 1153 mtx_lock(&tpr->pr_mtx); 1154 if (tpr->pr_ref > 0) { 1155 /* 1156 * Use this jail 1157 * for updates. 1158 */ 1159 if (tpr->pr_uref > 0) { 1160 pr = tpr; 1161 break; 1162 } 1163 deadpr = tpr; 1164 } 1165 mtx_unlock(&tpr->pr_mtx); 1166 } else if (tpr->pr_uref > 0) { 1167 /* 1168 * Create, or update(jid): 1169 * name must not exist in an 1170 * active sibling jail. 1171 */ 1172 error = EEXIST; 1173 if (pr != NULL) 1174 mtx_unlock(&pr->pr_mtx); 1175 vfs_opterror(opts, 1176 "jail \"%s\" already exists", 1177 name); 1178 goto done_unlock_list; 1179 } 1180 } 1181 } 1182 /* If no active jail is found, use a dying one. */ 1183 if (deadpr != NULL && pr == NULL) { 1184 if (flags & JAIL_DYING) { 1185 mtx_lock(&deadpr->pr_mtx); 1186 if (deadpr->pr_ref == 0) { 1187 mtx_unlock(&deadpr->pr_mtx); 1188 goto name_again; 1189 } 1190 pr = deadpr; 1191 } else if (cuflags == JAIL_UPDATE) { 1192 error = ENOENT; 1193 vfs_opterror(opts, 1194 "jail \"%s\" is dying", name); 1195 goto done_unlock_list; 1196 } 1197 } 1198 /* Update: name must exist if no jid. */ 1199 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1200 error = ENOENT; 1201 vfs_opterror(opts, "jail \"%s\" not found", 1202 name); 1203 goto done_unlock_list; 1204 } 1205 } 1206 } 1207 /* Update: must provide a jid or name. */ 1208 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1209 error = ENOENT; 1210 vfs_opterror(opts, "update specified no jail"); 1211 goto done_unlock_list; 1212 } 1213 1214 /* If there's no prison to update, create a new one and link it in. */ 1215 if (pr == NULL) { 1216 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1217 if (tpr->pr_childcount >= tpr->pr_childmax) { 1218 error = EPERM; 1219 vfs_opterror(opts, "prison limit exceeded"); 1220 goto done_unlock_list; 1221 } 1222 created = 1; 1223 mtx_lock(&ppr->pr_mtx); 1224 if (ppr->pr_ref == 0) { 1225 mtx_unlock(&ppr->pr_mtx); 1226 error = ENOENT; 1227 vfs_opterror(opts, "jail \"%s\" not found", 1228 prison_name(mypr, ppr)); 1229 goto done_unlock_list; 1230 } 1231 ppr->pr_ref++; 1232 ppr->pr_uref++; 1233 mtx_unlock(&ppr->pr_mtx); 1234 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1235 if (jid == 0) { 1236 /* Find the next free jid. */ 1237 jid = lastprid + 1; 1238 findnext: 1239 if (jid == JAIL_MAX) 1240 jid = 1; 1241 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1242 if (tpr->pr_id < jid) 1243 continue; 1244 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1245 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1246 break; 1247 } 1248 if (jid == lastprid) { 1249 error = EAGAIN; 1250 vfs_opterror(opts, 1251 "no available jail IDs"); 1252 free(pr, M_PRISON); 1253 prison_deref(ppr, PD_DEREF | 1254 PD_DEUREF | PD_LIST_XLOCKED); 1255 goto done_releroot; 1256 } 1257 jid++; 1258 goto findnext; 1259 } 1260 lastprid = jid; 1261 } else { 1262 /* 1263 * The jail already has a jid (that did not yet exist), 1264 * so just find where to insert it. 1265 */ 1266 TAILQ_FOREACH(tpr, &allprison, pr_list) 1267 if (tpr->pr_id >= jid) { 1268 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1269 break; 1270 } 1271 } 1272 if (tpr == NULL) 1273 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1274 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1275 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1276 tpr->pr_childcount++; 1277 1278 pr->pr_parent = ppr; 1279 pr->pr_id = jid; 1280 1281 /* Set some default values, and inherit some from the parent. */ 1282 if (namelc == NULL) 1283 namelc = ""; 1284 if (path == NULL) { 1285 path = "/"; 1286 root = mypr->pr_root; 1287 vref(root); 1288 } 1289 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1290 pr->pr_flags |= PR_HOST; 1291 #if defined(INET) || defined(INET6) 1292 #ifdef VIMAGE 1293 if (!(pr_flags & PR_VNET)) 1294 #endif 1295 { 1296 #ifdef INET 1297 if (!(ch_flags & PR_IP4_USER)) 1298 pr->pr_flags |= 1299 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE; 1300 else if (!(pr_flags & PR_IP4_USER)) { 1301 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1302 if (ppr->pr_ip4 != NULL) { 1303 pr->pr_ip4s = ppr->pr_ip4s; 1304 pr->pr_ip4 = malloc(pr->pr_ip4s * 1305 sizeof(struct in_addr), M_PRISON, 1306 M_WAITOK); 1307 bcopy(ppr->pr_ip4, pr->pr_ip4, 1308 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1309 } 1310 } 1311 #endif 1312 #ifdef INET6 1313 if (!(ch_flags & PR_IP6_USER)) 1314 pr->pr_flags |= 1315 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE; 1316 else if (!(pr_flags & PR_IP6_USER)) { 1317 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1318 if (ppr->pr_ip6 != NULL) { 1319 pr->pr_ip6s = ppr->pr_ip6s; 1320 pr->pr_ip6 = malloc(pr->pr_ip6s * 1321 sizeof(struct in6_addr), M_PRISON, 1322 M_WAITOK); 1323 bcopy(ppr->pr_ip6, pr->pr_ip6, 1324 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1325 } 1326 } 1327 #endif 1328 } 1329 #endif 1330 /* Source address selection is always on by default. */ 1331 pr->pr_flags |= _PR_IP_SADDRSEL; 1332 1333 pr->pr_securelevel = ppr->pr_securelevel; 1334 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1335 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 1336 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1337 1338 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1339 if (osrelstr == NULL) 1340 strcpy(pr->pr_osrelease, ppr->pr_osrelease); 1341 else 1342 strcpy(pr->pr_osrelease, osrelstr); 1343 1344 LIST_INIT(&pr->pr_children); 1345 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1346 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1347 1348 #ifdef VIMAGE 1349 /* Allocate a new vnet if specified. */ 1350 pr->pr_vnet = (pr_flags & PR_VNET) 1351 ? vnet_alloc() : ppr->pr_vnet; 1352 #endif 1353 /* 1354 * Allocate a dedicated cpuset for each jail. 1355 * Unlike other initial settings, this may return an erorr. 1356 */ 1357 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1358 if (error) { 1359 prison_deref(pr, PD_LIST_XLOCKED); 1360 goto done_releroot; 1361 } 1362 1363 mtx_lock(&pr->pr_mtx); 1364 /* 1365 * New prisons do not yet have a reference, because we do not 1366 * want others to see the incomplete prison once the 1367 * allprison_lock is downgraded. 1368 */ 1369 } else { 1370 created = 0; 1371 /* 1372 * Grab a reference for existing prisons, to ensure they 1373 * continue to exist for the duration of the call. 1374 */ 1375 pr->pr_ref++; 1376 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1377 if ((pr->pr_flags & PR_VNET) && 1378 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1379 error = EINVAL; 1380 vfs_opterror(opts, 1381 "vnet jails cannot have IP address restrictions"); 1382 goto done_deref_locked; 1383 } 1384 #endif 1385 #ifdef INET 1386 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1387 error = EINVAL; 1388 vfs_opterror(opts, 1389 "ip4 cannot be changed after creation"); 1390 goto done_deref_locked; 1391 } 1392 #endif 1393 #ifdef INET6 1394 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1395 error = EINVAL; 1396 vfs_opterror(opts, 1397 "ip6 cannot be changed after creation"); 1398 goto done_deref_locked; 1399 } 1400 #endif 1401 } 1402 1403 /* Do final error checking before setting anything. */ 1404 if (gotslevel) { 1405 if (slevel < ppr->pr_securelevel) { 1406 error = EPERM; 1407 goto done_deref_locked; 1408 } 1409 } 1410 if (gotchildmax) { 1411 if (childmax >= ppr->pr_childmax) { 1412 error = EPERM; 1413 goto done_deref_locked; 1414 } 1415 } 1416 if (gotenforce) { 1417 if (enforce < ppr->pr_enforce_statfs) { 1418 error = EPERM; 1419 goto done_deref_locked; 1420 } 1421 } 1422 if (gotrsnum) { 1423 /* 1424 * devfs_rsnum is a uint16_t 1425 */ 1426 if (rsnum < 0 || rsnum > 65535) { 1427 error = EINVAL; 1428 goto done_deref_locked; 1429 } 1430 /* 1431 * Nested jails always inherit parent's devfs ruleset 1432 */ 1433 if (jailed(td->td_ucred)) { 1434 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1435 error = EPERM; 1436 goto done_deref_locked; 1437 } else 1438 rsnum = ppr->pr_devfs_rsnum; 1439 } 1440 } 1441 #ifdef INET 1442 if (ip4s > 0) { 1443 if (ppr->pr_flags & PR_IP4) { 1444 /* 1445 * Make sure the new set of IP addresses is a 1446 * subset of the parent's list. Don't worry 1447 * about the parent being unlocked, as any 1448 * setting is done with allprison_lock held. 1449 */ 1450 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1451 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1452 break; 1453 if (ij == ppr->pr_ip4s) { 1454 error = EPERM; 1455 goto done_deref_locked; 1456 } 1457 if (ip4s > 1) { 1458 for (ii = ij = 1; ii < ip4s; ii++) { 1459 if (ip4[ii].s_addr == 1460 ppr->pr_ip4[0].s_addr) 1461 continue; 1462 for (; ij < ppr->pr_ip4s; ij++) 1463 if (ip4[ii].s_addr == 1464 ppr->pr_ip4[ij].s_addr) 1465 break; 1466 if (ij == ppr->pr_ip4s) 1467 break; 1468 } 1469 if (ij == ppr->pr_ip4s) { 1470 error = EPERM; 1471 goto done_deref_locked; 1472 } 1473 } 1474 } 1475 /* 1476 * Check for conflicting IP addresses. We permit them 1477 * if there is no more than one IP on each jail. If 1478 * there is a duplicate on a jail with more than one 1479 * IP stop checking and return error. 1480 */ 1481 tppr = ppr; 1482 #ifdef VIMAGE 1483 for (; tppr != &prison0; tppr = tppr->pr_parent) 1484 if (tppr->pr_flags & PR_VNET) 1485 break; 1486 #endif 1487 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1488 if (tpr == pr || 1489 #ifdef VIMAGE 1490 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1491 #endif 1492 tpr->pr_uref == 0) { 1493 descend = 0; 1494 continue; 1495 } 1496 if (!(tpr->pr_flags & PR_IP4_USER)) 1497 continue; 1498 descend = 0; 1499 if (tpr->pr_ip4 == NULL || 1500 (ip4s == 1 && tpr->pr_ip4s == 1)) 1501 continue; 1502 for (ii = 0; ii < ip4s; ii++) { 1503 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1504 error = EADDRINUSE; 1505 vfs_opterror(opts, 1506 "IPv4 addresses clash"); 1507 goto done_deref_locked; 1508 } 1509 } 1510 } 1511 } 1512 #endif 1513 #ifdef INET6 1514 if (ip6s > 0) { 1515 if (ppr->pr_flags & PR_IP6) { 1516 /* 1517 * Make sure the new set of IP addresses is a 1518 * subset of the parent's list. 1519 */ 1520 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1521 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1522 &ppr->pr_ip6[ij])) 1523 break; 1524 if (ij == ppr->pr_ip6s) { 1525 error = EPERM; 1526 goto done_deref_locked; 1527 } 1528 if (ip6s > 1) { 1529 for (ii = ij = 1; ii < ip6s; ii++) { 1530 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1531 &ppr->pr_ip6[0])) 1532 continue; 1533 for (; ij < ppr->pr_ip6s; ij++) 1534 if (IN6_ARE_ADDR_EQUAL( 1535 &ip6[ii], &ppr->pr_ip6[ij])) 1536 break; 1537 if (ij == ppr->pr_ip6s) 1538 break; 1539 } 1540 if (ij == ppr->pr_ip6s) { 1541 error = EPERM; 1542 goto done_deref_locked; 1543 } 1544 } 1545 } 1546 /* Check for conflicting IP addresses. */ 1547 tppr = ppr; 1548 #ifdef VIMAGE 1549 for (; tppr != &prison0; tppr = tppr->pr_parent) 1550 if (tppr->pr_flags & PR_VNET) 1551 break; 1552 #endif 1553 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1554 if (tpr == pr || 1555 #ifdef VIMAGE 1556 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1557 #endif 1558 tpr->pr_uref == 0) { 1559 descend = 0; 1560 continue; 1561 } 1562 if (!(tpr->pr_flags & PR_IP6_USER)) 1563 continue; 1564 descend = 0; 1565 if (tpr->pr_ip6 == NULL || 1566 (ip6s == 1 && tpr->pr_ip6s == 1)) 1567 continue; 1568 for (ii = 0; ii < ip6s; ii++) { 1569 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1570 error = EADDRINUSE; 1571 vfs_opterror(opts, 1572 "IPv6 addresses clash"); 1573 goto done_deref_locked; 1574 } 1575 } 1576 } 1577 } 1578 #endif 1579 onamelen = namelen = 0; 1580 if (namelc != NULL) { 1581 /* Give a default name of the jid. Also allow the name to be 1582 * explicitly the jid - but not any other number, and only in 1583 * normal form (no leading zero/etc). 1584 */ 1585 if (namelc[0] == '\0') 1586 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1587 else if ((strtoul(namelc, &p, 10) != jid || 1588 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1589 error = EINVAL; 1590 vfs_opterror(opts, 1591 "name cannot be numeric (unless it is the jid)"); 1592 goto done_deref_locked; 1593 } 1594 /* 1595 * Make sure the name isn't too long for the prison or its 1596 * children. 1597 */ 1598 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1599 onamelen = strlen(pr->pr_name + pnamelen); 1600 namelen = strlen(namelc); 1601 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1602 error = ENAMETOOLONG; 1603 goto done_deref_locked; 1604 } 1605 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1606 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1607 sizeof(pr->pr_name)) { 1608 error = ENAMETOOLONG; 1609 goto done_deref_locked; 1610 } 1611 } 1612 } 1613 if (pr_allow & ~ppr->pr_allow) { 1614 error = EPERM; 1615 goto done_deref_locked; 1616 } 1617 1618 /* 1619 * Let modules check their parameters. This requires unlocking and 1620 * then re-locking the prison, but this is still a valid state as long 1621 * as allprison_lock remains xlocked. 1622 */ 1623 mtx_unlock(&pr->pr_mtx); 1624 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1625 if (error != 0) { 1626 prison_deref(pr, created 1627 ? PD_LIST_XLOCKED 1628 : PD_DEREF | PD_LIST_XLOCKED); 1629 goto done_releroot; 1630 } 1631 mtx_lock(&pr->pr_mtx); 1632 1633 /* At this point, all valid parameters should have been noted. */ 1634 TAILQ_FOREACH(opt, opts, link) { 1635 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1636 error = EINVAL; 1637 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1638 goto done_deref_locked; 1639 } 1640 } 1641 1642 /* Set the parameters of the prison. */ 1643 #ifdef INET 1644 redo_ip4 = 0; 1645 if (pr_flags & PR_IP4_USER) { 1646 pr->pr_flags |= PR_IP4; 1647 free(pr->pr_ip4, M_PRISON); 1648 pr->pr_ip4s = ip4s; 1649 pr->pr_ip4 = ip4; 1650 ip4 = NULL; 1651 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1652 #ifdef VIMAGE 1653 if (tpr->pr_flags & PR_VNET) { 1654 descend = 0; 1655 continue; 1656 } 1657 #endif 1658 if (prison_restrict_ip4(tpr, NULL)) { 1659 redo_ip4 = 1; 1660 descend = 0; 1661 } 1662 } 1663 } 1664 #endif 1665 #ifdef INET6 1666 redo_ip6 = 0; 1667 if (pr_flags & PR_IP6_USER) { 1668 pr->pr_flags |= PR_IP6; 1669 free(pr->pr_ip6, M_PRISON); 1670 pr->pr_ip6s = ip6s; 1671 pr->pr_ip6 = ip6; 1672 ip6 = NULL; 1673 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1674 #ifdef VIMAGE 1675 if (tpr->pr_flags & PR_VNET) { 1676 descend = 0; 1677 continue; 1678 } 1679 #endif 1680 if (prison_restrict_ip6(tpr, NULL)) { 1681 redo_ip6 = 1; 1682 descend = 0; 1683 } 1684 } 1685 } 1686 #endif 1687 if (gotslevel) { 1688 pr->pr_securelevel = slevel; 1689 /* Set all child jails to be at least this level. */ 1690 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1691 if (tpr->pr_securelevel < slevel) 1692 tpr->pr_securelevel = slevel; 1693 } 1694 if (gotchildmax) { 1695 pr->pr_childmax = childmax; 1696 /* Set all child jails to under this limit. */ 1697 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1698 if (tpr->pr_childmax > childmax - level) 1699 tpr->pr_childmax = childmax > level 1700 ? childmax - level : 0; 1701 } 1702 if (gotenforce) { 1703 pr->pr_enforce_statfs = enforce; 1704 /* Pass this restriction on to the children. */ 1705 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1706 if (tpr->pr_enforce_statfs < enforce) 1707 tpr->pr_enforce_statfs = enforce; 1708 } 1709 if (gotrsnum) { 1710 pr->pr_devfs_rsnum = rsnum; 1711 /* Pass this restriction on to the children. */ 1712 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1713 tpr->pr_devfs_rsnum = rsnum; 1714 } 1715 if (namelc != NULL) { 1716 if (ppr == &prison0) 1717 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1718 else 1719 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1720 ppr->pr_name, namelc); 1721 /* Change this component of child names. */ 1722 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1723 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1724 strlen(tpr->pr_name + onamelen) + 1); 1725 bcopy(pr->pr_name, tpr->pr_name, namelen); 1726 } 1727 } 1728 if (path != NULL) { 1729 /* Try to keep a real-rooted full pathname. */ 1730 if (fullpath_disabled && path[0] == '/' && 1731 strcmp(mypr->pr_path, "/")) 1732 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1733 mypr->pr_path, path); 1734 else 1735 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1736 pr->pr_root = root; 1737 } 1738 if (PR_HOST & ch_flags & ~pr_flags) { 1739 if (pr->pr_flags & PR_HOST) { 1740 /* 1741 * Copy the parent's host info. As with pr_ip4 above, 1742 * the lack of a lock on the parent is not a problem; 1743 * it is always set with allprison_lock at least 1744 * shared, and is held exclusively here. 1745 */ 1746 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1747 sizeof(pr->pr_hostname)); 1748 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1749 sizeof(pr->pr_domainname)); 1750 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1751 sizeof(pr->pr_hostuuid)); 1752 pr->pr_hostid = pr->pr_parent->pr_hostid; 1753 } 1754 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1755 /* Set this prison, and any descendants without PR_HOST. */ 1756 if (host != NULL) 1757 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1758 if (domain != NULL) 1759 strlcpy(pr->pr_domainname, domain, 1760 sizeof(pr->pr_domainname)); 1761 if (uuid != NULL) 1762 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1763 if (gothid) 1764 pr->pr_hostid = hid; 1765 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1766 if (tpr->pr_flags & PR_HOST) 1767 descend = 0; 1768 else { 1769 if (host != NULL) 1770 strlcpy(tpr->pr_hostname, 1771 pr->pr_hostname, 1772 sizeof(tpr->pr_hostname)); 1773 if (domain != NULL) 1774 strlcpy(tpr->pr_domainname, 1775 pr->pr_domainname, 1776 sizeof(tpr->pr_domainname)); 1777 if (uuid != NULL) 1778 strlcpy(tpr->pr_hostuuid, 1779 pr->pr_hostuuid, 1780 sizeof(tpr->pr_hostuuid)); 1781 if (gothid) 1782 tpr->pr_hostid = hid; 1783 } 1784 } 1785 } 1786 if ((tallow = ch_allow & ~pr_allow)) { 1787 /* Clear allow bits in all children. */ 1788 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1789 tpr->pr_allow &= ~tallow; 1790 } 1791 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1792 /* 1793 * Persistent prisons get an extra reference, and prisons losing their 1794 * persist flag lose that reference. Only do this for existing prisons 1795 * for now, so new ones will remain unseen until after the module 1796 * handlers have completed. 1797 */ 1798 born = pr->pr_uref == 0; 1799 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1800 if (pr_flags & PR_PERSIST) { 1801 pr->pr_ref++; 1802 pr->pr_uref++; 1803 } else { 1804 pr->pr_ref--; 1805 pr->pr_uref--; 1806 } 1807 } 1808 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1809 mtx_unlock(&pr->pr_mtx); 1810 1811 #ifdef RACCT 1812 if (racct_enable && created) 1813 prison_racct_attach(pr); 1814 #endif 1815 1816 /* Locks may have prevented a complete restriction of child IP 1817 * addresses. If so, allocate some more memory and try again. 1818 */ 1819 #ifdef INET 1820 while (redo_ip4) { 1821 ip4s = pr->pr_ip4s; 1822 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1823 mtx_lock(&pr->pr_mtx); 1824 redo_ip4 = 0; 1825 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1826 #ifdef VIMAGE 1827 if (tpr->pr_flags & PR_VNET) { 1828 descend = 0; 1829 continue; 1830 } 1831 #endif 1832 if (prison_restrict_ip4(tpr, ip4)) { 1833 if (ip4 != NULL) 1834 ip4 = NULL; 1835 else 1836 redo_ip4 = 1; 1837 } 1838 } 1839 mtx_unlock(&pr->pr_mtx); 1840 } 1841 #endif 1842 #ifdef INET6 1843 while (redo_ip6) { 1844 ip6s = pr->pr_ip6s; 1845 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1846 mtx_lock(&pr->pr_mtx); 1847 redo_ip6 = 0; 1848 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1849 #ifdef VIMAGE 1850 if (tpr->pr_flags & PR_VNET) { 1851 descend = 0; 1852 continue; 1853 } 1854 #endif 1855 if (prison_restrict_ip6(tpr, ip6)) { 1856 if (ip6 != NULL) 1857 ip6 = NULL; 1858 else 1859 redo_ip6 = 1; 1860 } 1861 } 1862 mtx_unlock(&pr->pr_mtx); 1863 } 1864 #endif 1865 1866 /* Let the modules do their work. */ 1867 sx_downgrade(&allprison_lock); 1868 if (born) { 1869 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1870 if (error) { 1871 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1872 prison_deref(pr, created 1873 ? PD_LIST_SLOCKED 1874 : PD_DEREF | PD_LIST_SLOCKED); 1875 goto done_errmsg; 1876 } 1877 } 1878 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1879 if (error) { 1880 if (born) 1881 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1882 prison_deref(pr, created 1883 ? PD_LIST_SLOCKED 1884 : PD_DEREF | PD_LIST_SLOCKED); 1885 goto done_errmsg; 1886 } 1887 1888 /* Attach this process to the prison if requested. */ 1889 if (flags & JAIL_ATTACH) { 1890 mtx_lock(&pr->pr_mtx); 1891 error = do_jail_attach(td, pr); 1892 if (error) { 1893 vfs_opterror(opts, "attach failed"); 1894 if (!created) 1895 prison_deref(pr, PD_DEREF); 1896 goto done_errmsg; 1897 } 1898 } 1899 1900 #ifdef RACCT 1901 if (racct_enable && !created) { 1902 if (!(flags & JAIL_ATTACH)) 1903 sx_sunlock(&allprison_lock); 1904 prison_racct_modify(pr); 1905 if (!(flags & JAIL_ATTACH)) 1906 sx_slock(&allprison_lock); 1907 } 1908 #endif 1909 1910 td->td_retval[0] = pr->pr_id; 1911 1912 /* 1913 * Now that it is all there, drop the temporary reference from existing 1914 * prisons. Or add a reference to newly created persistent prisons 1915 * (which was not done earlier so that the prison would not be publicly 1916 * visible). 1917 */ 1918 if (!created) { 1919 prison_deref(pr, (flags & JAIL_ATTACH) 1920 ? PD_DEREF 1921 : PD_DEREF | PD_LIST_SLOCKED); 1922 } else { 1923 if (pr_flags & PR_PERSIST) { 1924 mtx_lock(&pr->pr_mtx); 1925 pr->pr_ref++; 1926 pr->pr_uref++; 1927 mtx_unlock(&pr->pr_mtx); 1928 } 1929 if (!(flags & JAIL_ATTACH)) 1930 sx_sunlock(&allprison_lock); 1931 } 1932 1933 goto done_free; 1934 1935 done_deref_locked: 1936 prison_deref(pr, created 1937 ? PD_LOCKED | PD_LIST_XLOCKED 1938 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1939 goto done_releroot; 1940 done_unlock_list: 1941 sx_xunlock(&allprison_lock); 1942 done_releroot: 1943 if (root != NULL) 1944 vrele(root); 1945 done_errmsg: 1946 if (error) { 1947 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 1948 &errmsg_len) == 0 && errmsg_len > 0) { 1949 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1950 if (optuio->uio_segflg == UIO_SYSSPACE) 1951 bcopy(errmsg, 1952 optuio->uio_iov[errmsg_pos].iov_base, 1953 errmsg_len); 1954 else 1955 copyout(errmsg, 1956 optuio->uio_iov[errmsg_pos].iov_base, 1957 errmsg_len); 1958 } 1959 } 1960 done_free: 1961 #ifdef INET 1962 free(ip4, M_PRISON); 1963 #endif 1964 #ifdef INET6 1965 free(ip6, M_PRISON); 1966 #endif 1967 if (g_path != NULL) 1968 free(g_path, M_TEMP); 1969 vfs_freeopts(opts); 1970 return (error); 1971 } 1972 1973 1974 /* 1975 * struct jail_get_args { 1976 * struct iovec *iovp; 1977 * unsigned int iovcnt; 1978 * int flags; 1979 * }; 1980 */ 1981 int 1982 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1983 { 1984 struct uio *auio; 1985 int error; 1986 1987 /* Check that we have an even number of iovecs. */ 1988 if (uap->iovcnt & 1) 1989 return (EINVAL); 1990 1991 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1992 if (error) 1993 return (error); 1994 error = kern_jail_get(td, auio, uap->flags); 1995 if (error == 0) 1996 error = copyout(auio->uio_iov, uap->iovp, 1997 uap->iovcnt * sizeof (struct iovec)); 1998 free(auio, M_IOV); 1999 return (error); 2000 } 2001 2002 int 2003 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 2004 { 2005 struct prison *pr, *mypr; 2006 struct vfsopt *opt; 2007 struct vfsoptlist *opts; 2008 char *errmsg, *name; 2009 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 2010 2011 if (flags & ~JAIL_GET_MASK) 2012 return (EINVAL); 2013 2014 /* Get the parameter list. */ 2015 error = vfs_buildopts(optuio, &opts); 2016 if (error) 2017 return (error); 2018 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 2019 mypr = td->td_ucred->cr_prison; 2020 2021 /* 2022 * Find the prison specified by one of: lastjid, jid, name. 2023 */ 2024 sx_slock(&allprison_lock); 2025 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 2026 if (error == 0) { 2027 TAILQ_FOREACH(pr, &allprison, pr_list) { 2028 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 2029 mtx_lock(&pr->pr_mtx); 2030 if (pr->pr_ref > 0 && 2031 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 2032 break; 2033 mtx_unlock(&pr->pr_mtx); 2034 } 2035 } 2036 if (pr != NULL) 2037 goto found_prison; 2038 error = ENOENT; 2039 vfs_opterror(opts, "no jail after %d", jid); 2040 goto done_unlock_list; 2041 } else if (error != ENOENT) 2042 goto done_unlock_list; 2043 2044 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 2045 if (error == 0) { 2046 if (jid != 0) { 2047 pr = prison_find_child(mypr, jid); 2048 if (pr != NULL) { 2049 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2050 mtx_unlock(&pr->pr_mtx); 2051 error = ENOENT; 2052 vfs_opterror(opts, "jail %d is dying", 2053 jid); 2054 goto done_unlock_list; 2055 } 2056 goto found_prison; 2057 } 2058 error = ENOENT; 2059 vfs_opterror(opts, "jail %d not found", jid); 2060 goto done_unlock_list; 2061 } 2062 } else if (error != ENOENT) 2063 goto done_unlock_list; 2064 2065 error = vfs_getopt(opts, "name", (void **)&name, &len); 2066 if (error == 0) { 2067 if (len == 0 || name[len - 1] != '\0') { 2068 error = EINVAL; 2069 goto done_unlock_list; 2070 } 2071 pr = prison_find_name(mypr, name); 2072 if (pr != NULL) { 2073 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2074 mtx_unlock(&pr->pr_mtx); 2075 error = ENOENT; 2076 vfs_opterror(opts, "jail \"%s\" is dying", 2077 name); 2078 goto done_unlock_list; 2079 } 2080 goto found_prison; 2081 } 2082 error = ENOENT; 2083 vfs_opterror(opts, "jail \"%s\" not found", name); 2084 goto done_unlock_list; 2085 } else if (error != ENOENT) 2086 goto done_unlock_list; 2087 2088 vfs_opterror(opts, "no jail specified"); 2089 error = ENOENT; 2090 goto done_unlock_list; 2091 2092 found_prison: 2093 /* Get the parameters of the prison. */ 2094 pr->pr_ref++; 2095 locked = PD_LOCKED; 2096 td->td_retval[0] = pr->pr_id; 2097 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2098 if (error != 0 && error != ENOENT) 2099 goto done_deref; 2100 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2101 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2102 if (error != 0 && error != ENOENT) 2103 goto done_deref; 2104 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2105 if (error != 0 && error != ENOENT) 2106 goto done_deref; 2107 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2108 sizeof(pr->pr_cpuset->cs_id)); 2109 if (error != 0 && error != ENOENT) 2110 goto done_deref; 2111 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2112 if (error != 0 && error != ENOENT) 2113 goto done_deref; 2114 #ifdef INET 2115 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2116 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2117 if (error != 0 && error != ENOENT) 2118 goto done_deref; 2119 #endif 2120 #ifdef INET6 2121 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2122 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2123 if (error != 0 && error != ENOENT) 2124 goto done_deref; 2125 #endif 2126 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2127 sizeof(pr->pr_securelevel)); 2128 if (error != 0 && error != ENOENT) 2129 goto done_deref; 2130 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2131 sizeof(pr->pr_childcount)); 2132 if (error != 0 && error != ENOENT) 2133 goto done_deref; 2134 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2135 sizeof(pr->pr_childmax)); 2136 if (error != 0 && error != ENOENT) 2137 goto done_deref; 2138 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2139 if (error != 0 && error != ENOENT) 2140 goto done_deref; 2141 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2142 if (error != 0 && error != ENOENT) 2143 goto done_deref; 2144 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2145 if (error != 0 && error != ENOENT) 2146 goto done_deref; 2147 #ifdef COMPAT_FREEBSD32 2148 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2149 uint32_t hid32 = pr->pr_hostid; 2150 2151 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2152 } else 2153 #endif 2154 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2155 sizeof(pr->pr_hostid)); 2156 if (error != 0 && error != ENOENT) 2157 goto done_deref; 2158 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2159 sizeof(pr->pr_enforce_statfs)); 2160 if (error != 0 && error != ENOENT) 2161 goto done_deref; 2162 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2163 sizeof(pr->pr_devfs_rsnum)); 2164 if (error != 0 && error != ENOENT) 2165 goto done_deref; 2166 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 2167 fi++) { 2168 if (pr_flag_names[fi] == NULL) 2169 continue; 2170 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2171 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2172 if (error != 0 && error != ENOENT) 2173 goto done_deref; 2174 i = !i; 2175 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2176 if (error != 0 && error != ENOENT) 2177 goto done_deref; 2178 } 2179 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 2180 fi++) { 2181 i = pr->pr_flags & 2182 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2183 i = pr_flag_jailsys[fi].disable && 2184 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2185 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2186 : JAIL_SYS_INHERIT; 2187 error = 2188 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2189 if (error != 0 && error != ENOENT) 2190 goto done_deref; 2191 } 2192 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 2193 fi++) { 2194 if (pr_allow_names[fi] == NULL) 2195 continue; 2196 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2197 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2198 if (error != 0 && error != ENOENT) 2199 goto done_deref; 2200 i = !i; 2201 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2202 if (error != 0 && error != ENOENT) 2203 goto done_deref; 2204 } 2205 i = (pr->pr_uref == 0); 2206 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2207 if (error != 0 && error != ENOENT) 2208 goto done_deref; 2209 i = !i; 2210 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2211 if (error != 0 && error != ENOENT) 2212 goto done_deref; 2213 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2214 sizeof(pr->pr_osreldate)); 2215 if (error != 0 && error != ENOENT) 2216 goto done_deref; 2217 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2218 if (error != 0 && error != ENOENT) 2219 goto done_deref; 2220 2221 /* Get the module parameters. */ 2222 mtx_unlock(&pr->pr_mtx); 2223 locked = 0; 2224 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2225 if (error) 2226 goto done_deref; 2227 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2228 2229 /* By now, all parameters should have been noted. */ 2230 TAILQ_FOREACH(opt, opts, link) { 2231 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2232 error = EINVAL; 2233 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2234 goto done_errmsg; 2235 } 2236 } 2237 2238 /* Write the fetched parameters back to userspace. */ 2239 error = 0; 2240 TAILQ_FOREACH(opt, opts, link) { 2241 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2242 pos = 2 * opt->pos + 1; 2243 optuio->uio_iov[pos].iov_len = opt->len; 2244 if (opt->value != NULL) { 2245 if (optuio->uio_segflg == UIO_SYSSPACE) { 2246 bcopy(opt->value, 2247 optuio->uio_iov[pos].iov_base, 2248 opt->len); 2249 } else { 2250 error = copyout(opt->value, 2251 optuio->uio_iov[pos].iov_base, 2252 opt->len); 2253 if (error) 2254 break; 2255 } 2256 } 2257 } 2258 } 2259 goto done_errmsg; 2260 2261 done_deref: 2262 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2263 goto done_errmsg; 2264 2265 done_unlock_list: 2266 sx_sunlock(&allprison_lock); 2267 done_errmsg: 2268 if (error && errmsg_pos >= 0) { 2269 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2270 errmsg_pos = 2 * errmsg_pos + 1; 2271 if (errmsg_len > 0) { 2272 if (optuio->uio_segflg == UIO_SYSSPACE) 2273 bcopy(errmsg, 2274 optuio->uio_iov[errmsg_pos].iov_base, 2275 errmsg_len); 2276 else 2277 copyout(errmsg, 2278 optuio->uio_iov[errmsg_pos].iov_base, 2279 errmsg_len); 2280 } 2281 } 2282 vfs_freeopts(opts); 2283 return (error); 2284 } 2285 2286 2287 /* 2288 * struct jail_remove_args { 2289 * int jid; 2290 * }; 2291 */ 2292 int 2293 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2294 { 2295 struct prison *pr, *cpr, *lpr, *tpr; 2296 int descend, error; 2297 2298 error = priv_check(td, PRIV_JAIL_REMOVE); 2299 if (error) 2300 return (error); 2301 2302 sx_xlock(&allprison_lock); 2303 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2304 if (pr == NULL) { 2305 sx_xunlock(&allprison_lock); 2306 return (EINVAL); 2307 } 2308 2309 /* Remove all descendants of this prison, then remove this prison. */ 2310 pr->pr_ref++; 2311 if (!LIST_EMPTY(&pr->pr_children)) { 2312 mtx_unlock(&pr->pr_mtx); 2313 lpr = NULL; 2314 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2315 mtx_lock(&cpr->pr_mtx); 2316 if (cpr->pr_ref > 0) { 2317 tpr = cpr; 2318 cpr->pr_ref++; 2319 } else { 2320 /* Already removed - do not do it again. */ 2321 tpr = NULL; 2322 } 2323 mtx_unlock(&cpr->pr_mtx); 2324 if (lpr != NULL) { 2325 mtx_lock(&lpr->pr_mtx); 2326 prison_remove_one(lpr); 2327 sx_xlock(&allprison_lock); 2328 } 2329 lpr = tpr; 2330 } 2331 if (lpr != NULL) { 2332 mtx_lock(&lpr->pr_mtx); 2333 prison_remove_one(lpr); 2334 sx_xlock(&allprison_lock); 2335 } 2336 mtx_lock(&pr->pr_mtx); 2337 } 2338 prison_remove_one(pr); 2339 return (0); 2340 } 2341 2342 static void 2343 prison_remove_one(struct prison *pr) 2344 { 2345 struct proc *p; 2346 int deuref; 2347 2348 /* If the prison was persistent, it is not anymore. */ 2349 deuref = 0; 2350 if (pr->pr_flags & PR_PERSIST) { 2351 pr->pr_ref--; 2352 deuref = PD_DEUREF; 2353 pr->pr_flags &= ~PR_PERSIST; 2354 } 2355 2356 /* 2357 * jail_remove added a reference. If that's the only one, remove 2358 * the prison now. 2359 */ 2360 KASSERT(pr->pr_ref > 0, 2361 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2362 if (pr->pr_ref == 1) { 2363 prison_deref(pr, 2364 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2365 return; 2366 } 2367 2368 mtx_unlock(&pr->pr_mtx); 2369 sx_xunlock(&allprison_lock); 2370 /* 2371 * Kill all processes unfortunate enough to be attached to this prison. 2372 */ 2373 sx_slock(&allproc_lock); 2374 LIST_FOREACH(p, &allproc, p_list) { 2375 PROC_LOCK(p); 2376 if (p->p_state != PRS_NEW && p->p_ucred && 2377 p->p_ucred->cr_prison == pr) 2378 kern_psignal(p, SIGKILL); 2379 PROC_UNLOCK(p); 2380 } 2381 sx_sunlock(&allproc_lock); 2382 /* Remove the temporary reference added by jail_remove. */ 2383 prison_deref(pr, deuref | PD_DEREF); 2384 } 2385 2386 2387 /* 2388 * struct jail_attach_args { 2389 * int jid; 2390 * }; 2391 */ 2392 int 2393 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2394 { 2395 struct prison *pr; 2396 int error; 2397 2398 error = priv_check(td, PRIV_JAIL_ATTACH); 2399 if (error) 2400 return (error); 2401 2402 /* 2403 * Start with exclusive hold on allprison_lock to ensure that a possible 2404 * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove. 2405 * But then immediately downgrade it since we don't need to stop 2406 * readers. 2407 */ 2408 sx_xlock(&allprison_lock); 2409 sx_downgrade(&allprison_lock); 2410 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2411 if (pr == NULL) { 2412 sx_sunlock(&allprison_lock); 2413 return (EINVAL); 2414 } 2415 2416 /* 2417 * Do not allow a process to attach to a prison that is not 2418 * considered to be "alive". 2419 */ 2420 if (pr->pr_uref == 0) { 2421 mtx_unlock(&pr->pr_mtx); 2422 sx_sunlock(&allprison_lock); 2423 return (EINVAL); 2424 } 2425 2426 return (do_jail_attach(td, pr)); 2427 } 2428 2429 static int 2430 do_jail_attach(struct thread *td, struct prison *pr) 2431 { 2432 struct proc *p; 2433 struct ucred *newcred, *oldcred; 2434 int error; 2435 2436 /* 2437 * XXX: Note that there is a slight race here if two threads 2438 * in the same privileged process attempt to attach to two 2439 * different jails at the same time. It is important for 2440 * user processes not to do this, or they might end up with 2441 * a process root from one prison, but attached to the jail 2442 * of another. 2443 */ 2444 pr->pr_ref++; 2445 pr->pr_uref++; 2446 mtx_unlock(&pr->pr_mtx); 2447 2448 /* Let modules do whatever they need to prepare for attaching. */ 2449 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2450 if (error) { 2451 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2452 return (error); 2453 } 2454 sx_sunlock(&allprison_lock); 2455 2456 /* 2457 * Reparent the newly attached process to this jail. 2458 */ 2459 p = td->td_proc; 2460 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2461 if (error) 2462 goto e_revert_osd; 2463 2464 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2465 if ((error = change_dir(pr->pr_root, td)) != 0) 2466 goto e_unlock; 2467 #ifdef MAC 2468 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2469 goto e_unlock; 2470 #endif 2471 VOP_UNLOCK(pr->pr_root, 0); 2472 if ((error = change_root(pr->pr_root, td))) 2473 goto e_revert_osd; 2474 2475 newcred = crget(); 2476 PROC_LOCK(p); 2477 oldcred = crcopysafe(p, newcred); 2478 newcred->cr_prison = pr; 2479 proc_set_cred(p, newcred); 2480 setsugid(p); 2481 PROC_UNLOCK(p); 2482 #ifdef RACCT 2483 racct_proc_ucred_changed(p, oldcred, newcred); 2484 #endif 2485 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF); 2486 crfree(oldcred); 2487 return (0); 2488 2489 e_unlock: 2490 VOP_UNLOCK(pr->pr_root, 0); 2491 e_revert_osd: 2492 /* Tell modules this thread is still in its old jail after all. */ 2493 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2494 prison_deref(pr, PD_DEREF | PD_DEUREF); 2495 return (error); 2496 } 2497 2498 2499 /* 2500 * Returns a locked prison instance, or NULL on failure. 2501 */ 2502 struct prison * 2503 prison_find(int prid) 2504 { 2505 struct prison *pr; 2506 2507 sx_assert(&allprison_lock, SX_LOCKED); 2508 TAILQ_FOREACH(pr, &allprison, pr_list) { 2509 if (pr->pr_id == prid) { 2510 mtx_lock(&pr->pr_mtx); 2511 if (pr->pr_ref > 0) 2512 return (pr); 2513 mtx_unlock(&pr->pr_mtx); 2514 } 2515 } 2516 return (NULL); 2517 } 2518 2519 /* 2520 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2521 */ 2522 struct prison * 2523 prison_find_child(struct prison *mypr, int prid) 2524 { 2525 struct prison *pr; 2526 int descend; 2527 2528 sx_assert(&allprison_lock, SX_LOCKED); 2529 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2530 if (pr->pr_id == prid) { 2531 mtx_lock(&pr->pr_mtx); 2532 if (pr->pr_ref > 0) 2533 return (pr); 2534 mtx_unlock(&pr->pr_mtx); 2535 } 2536 } 2537 return (NULL); 2538 } 2539 2540 /* 2541 * Look for the name relative to mypr. Returns a locked prison or NULL. 2542 */ 2543 struct prison * 2544 prison_find_name(struct prison *mypr, const char *name) 2545 { 2546 struct prison *pr, *deadpr; 2547 size_t mylen; 2548 int descend; 2549 2550 sx_assert(&allprison_lock, SX_LOCKED); 2551 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2552 again: 2553 deadpr = NULL; 2554 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2555 if (!strcmp(pr->pr_name + mylen, name)) { 2556 mtx_lock(&pr->pr_mtx); 2557 if (pr->pr_ref > 0) { 2558 if (pr->pr_uref > 0) 2559 return (pr); 2560 deadpr = pr; 2561 } 2562 mtx_unlock(&pr->pr_mtx); 2563 } 2564 } 2565 /* There was no valid prison - perhaps there was a dying one. */ 2566 if (deadpr != NULL) { 2567 mtx_lock(&deadpr->pr_mtx); 2568 if (deadpr->pr_ref == 0) { 2569 mtx_unlock(&deadpr->pr_mtx); 2570 goto again; 2571 } 2572 } 2573 return (deadpr); 2574 } 2575 2576 /* 2577 * See if a prison has the specific flag set. 2578 */ 2579 int 2580 prison_flag(struct ucred *cred, unsigned flag) 2581 { 2582 2583 /* This is an atomic read, so no locking is necessary. */ 2584 return (cred->cr_prison->pr_flags & flag); 2585 } 2586 2587 int 2588 prison_allow(struct ucred *cred, unsigned flag) 2589 { 2590 2591 /* This is an atomic read, so no locking is necessary. */ 2592 return (cred->cr_prison->pr_allow & flag); 2593 } 2594 2595 /* 2596 * Remove a prison reference. If that was the last reference, remove the 2597 * prison itself - but not in this context in case there are locks held. 2598 */ 2599 void 2600 prison_free_locked(struct prison *pr) 2601 { 2602 int ref; 2603 2604 mtx_assert(&pr->pr_mtx, MA_OWNED); 2605 ref = --pr->pr_ref; 2606 mtx_unlock(&pr->pr_mtx); 2607 if (ref == 0) 2608 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2609 } 2610 2611 void 2612 prison_free(struct prison *pr) 2613 { 2614 2615 mtx_lock(&pr->pr_mtx); 2616 prison_free_locked(pr); 2617 } 2618 2619 /* 2620 * Complete a call to either prison_free or prison_proc_free. 2621 */ 2622 static void 2623 prison_complete(void *context, int pending) 2624 { 2625 struct prison *pr = context; 2626 2627 sx_xlock(&allprison_lock); 2628 mtx_lock(&pr->pr_mtx); 2629 prison_deref(pr, pr->pr_uref 2630 ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED 2631 : PD_LOCKED | PD_LIST_XLOCKED); 2632 } 2633 2634 /* 2635 * Remove a prison reference (usually). This internal version assumes no 2636 * mutexes are held, except perhaps the prison itself. If there are no more 2637 * references, release and delist the prison. On completion, the prison lock 2638 * and the allprison lock are both unlocked. 2639 */ 2640 static void 2641 prison_deref(struct prison *pr, int flags) 2642 { 2643 struct prison *ppr, *tpr; 2644 int ref, lasturef; 2645 2646 if (!(flags & PD_LOCKED)) 2647 mtx_lock(&pr->pr_mtx); 2648 for (;;) { 2649 if (flags & PD_DEUREF) { 2650 KASSERT(pr->pr_uref > 0, 2651 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 2652 pr->pr_id)); 2653 pr->pr_uref--; 2654 lasturef = pr->pr_uref == 0; 2655 if (lasturef) 2656 pr->pr_ref++; 2657 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2658 } else 2659 lasturef = 0; 2660 if (flags & PD_DEREF) { 2661 KASSERT(pr->pr_ref > 0, 2662 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 2663 pr->pr_id)); 2664 pr->pr_ref--; 2665 } 2666 ref = pr->pr_ref; 2667 mtx_unlock(&pr->pr_mtx); 2668 2669 /* 2670 * Tell the modules if the last user reference was removed 2671 * (even it sticks around in dying state). 2672 */ 2673 if (lasturef) { 2674 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) { 2675 sx_xlock(&allprison_lock); 2676 flags |= PD_LIST_XLOCKED; 2677 } 2678 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 2679 mtx_lock(&pr->pr_mtx); 2680 ref = --pr->pr_ref; 2681 mtx_unlock(&pr->pr_mtx); 2682 } 2683 2684 /* If the prison still has references, nothing else to do. */ 2685 if (ref > 0) { 2686 if (flags & PD_LIST_SLOCKED) 2687 sx_sunlock(&allprison_lock); 2688 else if (flags & PD_LIST_XLOCKED) 2689 sx_xunlock(&allprison_lock); 2690 return; 2691 } 2692 2693 if (flags & PD_LIST_SLOCKED) { 2694 if (!sx_try_upgrade(&allprison_lock)) { 2695 sx_sunlock(&allprison_lock); 2696 sx_xlock(&allprison_lock); 2697 } 2698 } else if (!(flags & PD_LIST_XLOCKED)) 2699 sx_xlock(&allprison_lock); 2700 2701 TAILQ_REMOVE(&allprison, pr, pr_list); 2702 LIST_REMOVE(pr, pr_sibling); 2703 ppr = pr->pr_parent; 2704 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2705 tpr->pr_childcount--; 2706 sx_xunlock(&allprison_lock); 2707 2708 #ifdef VIMAGE 2709 if (pr->pr_vnet != ppr->pr_vnet) 2710 vnet_destroy(pr->pr_vnet); 2711 #endif 2712 if (pr->pr_root != NULL) 2713 vrele(pr->pr_root); 2714 mtx_destroy(&pr->pr_mtx); 2715 #ifdef INET 2716 free(pr->pr_ip4, M_PRISON); 2717 #endif 2718 #ifdef INET6 2719 free(pr->pr_ip6, M_PRISON); 2720 #endif 2721 if (pr->pr_cpuset != NULL) 2722 cpuset_rel(pr->pr_cpuset); 2723 osd_jail_exit(pr); 2724 #ifdef RACCT 2725 if (racct_enable) 2726 prison_racct_detach(pr); 2727 #endif 2728 free(pr, M_PRISON); 2729 2730 /* Removing a prison frees a reference on its parent. */ 2731 pr = ppr; 2732 mtx_lock(&pr->pr_mtx); 2733 flags = PD_DEREF | PD_DEUREF; 2734 } 2735 } 2736 2737 void 2738 prison_hold_locked(struct prison *pr) 2739 { 2740 2741 mtx_assert(&pr->pr_mtx, MA_OWNED); 2742 KASSERT(pr->pr_ref > 0, 2743 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2744 pr->pr_ref++; 2745 } 2746 2747 void 2748 prison_hold(struct prison *pr) 2749 { 2750 2751 mtx_lock(&pr->pr_mtx); 2752 prison_hold_locked(pr); 2753 mtx_unlock(&pr->pr_mtx); 2754 } 2755 2756 void 2757 prison_proc_hold(struct prison *pr) 2758 { 2759 2760 mtx_lock(&pr->pr_mtx); 2761 KASSERT(pr->pr_uref > 0, 2762 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2763 pr->pr_uref++; 2764 mtx_unlock(&pr->pr_mtx); 2765 } 2766 2767 void 2768 prison_proc_free(struct prison *pr) 2769 { 2770 2771 mtx_lock(&pr->pr_mtx); 2772 KASSERT(pr->pr_uref > 0, 2773 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2774 if (pr->pr_uref > 1) 2775 pr->pr_uref--; 2776 else { 2777 /* 2778 * Don't remove the last user reference in this context, which 2779 * is expected to be a process that is not only locked, but 2780 * also half dead. 2781 */ 2782 pr->pr_ref++; 2783 mtx_unlock(&pr->pr_mtx); 2784 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2785 return; 2786 } 2787 mtx_unlock(&pr->pr_mtx); 2788 } 2789 2790 2791 #ifdef INET 2792 /* 2793 * Restrict a prison's IP address list with its parent's, possibly replacing 2794 * it. Return true if the replacement buffer was used (or would have been). 2795 */ 2796 static int 2797 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2798 { 2799 int ii, ij, used; 2800 struct prison *ppr; 2801 2802 ppr = pr->pr_parent; 2803 if (!(pr->pr_flags & PR_IP4_USER)) { 2804 /* This has no user settings, so just copy the parent's list. */ 2805 if (pr->pr_ip4s < ppr->pr_ip4s) { 2806 /* 2807 * There's no room for the parent's list. Use the 2808 * new list buffer, which is assumed to be big enough 2809 * (if it was passed). If there's no buffer, try to 2810 * allocate one. 2811 */ 2812 used = 1; 2813 if (newip4 == NULL) { 2814 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2815 M_PRISON, M_NOWAIT); 2816 if (newip4 != NULL) 2817 used = 0; 2818 } 2819 if (newip4 != NULL) { 2820 bcopy(ppr->pr_ip4, newip4, 2821 ppr->pr_ip4s * sizeof(*newip4)); 2822 free(pr->pr_ip4, M_PRISON); 2823 pr->pr_ip4 = newip4; 2824 pr->pr_ip4s = ppr->pr_ip4s; 2825 } 2826 return (used); 2827 } 2828 pr->pr_ip4s = ppr->pr_ip4s; 2829 if (pr->pr_ip4s > 0) 2830 bcopy(ppr->pr_ip4, pr->pr_ip4, 2831 pr->pr_ip4s * sizeof(*newip4)); 2832 else if (pr->pr_ip4 != NULL) { 2833 free(pr->pr_ip4, M_PRISON); 2834 pr->pr_ip4 = NULL; 2835 } 2836 } else if (pr->pr_ip4s > 0) { 2837 /* Remove addresses that aren't in the parent. */ 2838 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2839 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2840 break; 2841 if (ij < ppr->pr_ip4s) 2842 ii = 1; 2843 else { 2844 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2845 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2846 ii = 0; 2847 } 2848 for (ij = 1; ii < pr->pr_ip4s; ) { 2849 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2850 ii++; 2851 continue; 2852 } 2853 switch (ij >= ppr->pr_ip4s ? -1 : 2854 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2855 case -1: 2856 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2857 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2858 break; 2859 case 0: 2860 ii++; 2861 ij++; 2862 break; 2863 case 1: 2864 ij++; 2865 break; 2866 } 2867 } 2868 if (pr->pr_ip4s == 0) { 2869 pr->pr_flags |= PR_IP4_DISABLE; 2870 free(pr->pr_ip4, M_PRISON); 2871 pr->pr_ip4 = NULL; 2872 } 2873 } 2874 return (0); 2875 } 2876 2877 /* 2878 * Pass back primary IPv4 address of this jail. 2879 * 2880 * If not restricted return success but do not alter the address. Caller has 2881 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2882 * 2883 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2884 * Address returned in NBO. 2885 */ 2886 int 2887 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2888 { 2889 struct prison *pr; 2890 2891 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2892 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2893 2894 pr = cred->cr_prison; 2895 if (!(pr->pr_flags & PR_IP4)) 2896 return (0); 2897 mtx_lock(&pr->pr_mtx); 2898 if (!(pr->pr_flags & PR_IP4)) { 2899 mtx_unlock(&pr->pr_mtx); 2900 return (0); 2901 } 2902 if (pr->pr_ip4 == NULL) { 2903 mtx_unlock(&pr->pr_mtx); 2904 return (EAFNOSUPPORT); 2905 } 2906 2907 ia->s_addr = pr->pr_ip4[0].s_addr; 2908 mtx_unlock(&pr->pr_mtx); 2909 return (0); 2910 } 2911 2912 /* 2913 * Return 1 if we should do proper source address selection or are not jailed. 2914 * We will return 0 if we should bypass source address selection in favour 2915 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2916 * returned in NBO. 2917 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2918 */ 2919 int 2920 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2921 { 2922 struct prison *pr; 2923 struct in_addr lia; 2924 int error; 2925 2926 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2927 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2928 2929 if (!jailed(cred)) 2930 return (1); 2931 2932 pr = cred->cr_prison; 2933 if (pr->pr_flags & PR_IP4_SADDRSEL) 2934 return (1); 2935 2936 lia.s_addr = INADDR_ANY; 2937 error = prison_get_ip4(cred, &lia); 2938 if (error) 2939 return (error); 2940 if (lia.s_addr == INADDR_ANY) 2941 return (1); 2942 2943 ia->s_addr = lia.s_addr; 2944 return (0); 2945 } 2946 2947 /* 2948 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2949 */ 2950 int 2951 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2952 { 2953 2954 if (pr1 == pr2) 2955 return (1); 2956 2957 /* 2958 * No need to lock since the PR_IP4_USER flag can't be altered for 2959 * existing prisons. 2960 */ 2961 while (pr1 != &prison0 && 2962 #ifdef VIMAGE 2963 !(pr1->pr_flags & PR_VNET) && 2964 #endif 2965 !(pr1->pr_flags & PR_IP4_USER)) 2966 pr1 = pr1->pr_parent; 2967 while (pr2 != &prison0 && 2968 #ifdef VIMAGE 2969 !(pr2->pr_flags & PR_VNET) && 2970 #endif 2971 !(pr2->pr_flags & PR_IP4_USER)) 2972 pr2 = pr2->pr_parent; 2973 return (pr1 == pr2); 2974 } 2975 2976 /* 2977 * Make sure our (source) address is set to something meaningful to this 2978 * jail. 2979 * 2980 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2981 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2982 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2983 */ 2984 int 2985 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2986 { 2987 struct prison *pr; 2988 struct in_addr ia0; 2989 int error; 2990 2991 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2992 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2993 2994 pr = cred->cr_prison; 2995 if (!(pr->pr_flags & PR_IP4)) 2996 return (0); 2997 mtx_lock(&pr->pr_mtx); 2998 if (!(pr->pr_flags & PR_IP4)) { 2999 mtx_unlock(&pr->pr_mtx); 3000 return (0); 3001 } 3002 if (pr->pr_ip4 == NULL) { 3003 mtx_unlock(&pr->pr_mtx); 3004 return (EAFNOSUPPORT); 3005 } 3006 3007 ia0.s_addr = ntohl(ia->s_addr); 3008 if (ia0.s_addr == INADDR_LOOPBACK) { 3009 ia->s_addr = pr->pr_ip4[0].s_addr; 3010 mtx_unlock(&pr->pr_mtx); 3011 return (0); 3012 } 3013 3014 if (ia0.s_addr == INADDR_ANY) { 3015 /* 3016 * In case there is only 1 IPv4 address, bind directly. 3017 */ 3018 if (pr->pr_ip4s == 1) 3019 ia->s_addr = pr->pr_ip4[0].s_addr; 3020 mtx_unlock(&pr->pr_mtx); 3021 return (0); 3022 } 3023 3024 error = _prison_check_ip4(pr, ia); 3025 mtx_unlock(&pr->pr_mtx); 3026 return (error); 3027 } 3028 3029 /* 3030 * Rewrite destination address in case we will connect to loopback address. 3031 * 3032 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 3033 * Address passed in in NBO and returned in NBO. 3034 */ 3035 int 3036 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 3037 { 3038 struct prison *pr; 3039 3040 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3041 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 3042 3043 pr = cred->cr_prison; 3044 if (!(pr->pr_flags & PR_IP4)) 3045 return (0); 3046 mtx_lock(&pr->pr_mtx); 3047 if (!(pr->pr_flags & PR_IP4)) { 3048 mtx_unlock(&pr->pr_mtx); 3049 return (0); 3050 } 3051 if (pr->pr_ip4 == NULL) { 3052 mtx_unlock(&pr->pr_mtx); 3053 return (EAFNOSUPPORT); 3054 } 3055 3056 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 3057 ia->s_addr = pr->pr_ip4[0].s_addr; 3058 mtx_unlock(&pr->pr_mtx); 3059 return (0); 3060 } 3061 3062 /* 3063 * Return success because nothing had to be changed. 3064 */ 3065 mtx_unlock(&pr->pr_mtx); 3066 return (0); 3067 } 3068 3069 /* 3070 * Check if given address belongs to the jail referenced by cred/prison. 3071 * 3072 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 3073 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3074 * doesn't allow IPv4. Address passed in in NBO. 3075 */ 3076 static int 3077 _prison_check_ip4(struct prison *pr, struct in_addr *ia) 3078 { 3079 int i, a, z, d; 3080 3081 /* 3082 * Check the primary IP. 3083 */ 3084 if (pr->pr_ip4[0].s_addr == ia->s_addr) 3085 return (0); 3086 3087 /* 3088 * All the other IPs are sorted so we can do a binary search. 3089 */ 3090 a = 0; 3091 z = pr->pr_ip4s - 2; 3092 while (a <= z) { 3093 i = (a + z) / 2; 3094 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 3095 if (d > 0) 3096 z = i - 1; 3097 else if (d < 0) 3098 a = i + 1; 3099 else 3100 return (0); 3101 } 3102 3103 return (EADDRNOTAVAIL); 3104 } 3105 3106 int 3107 prison_check_ip4(struct ucred *cred, struct in_addr *ia) 3108 { 3109 struct prison *pr; 3110 int error; 3111 3112 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3113 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 3114 3115 pr = cred->cr_prison; 3116 if (!(pr->pr_flags & PR_IP4)) 3117 return (0); 3118 mtx_lock(&pr->pr_mtx); 3119 if (!(pr->pr_flags & PR_IP4)) { 3120 mtx_unlock(&pr->pr_mtx); 3121 return (0); 3122 } 3123 if (pr->pr_ip4 == NULL) { 3124 mtx_unlock(&pr->pr_mtx); 3125 return (EAFNOSUPPORT); 3126 } 3127 3128 error = _prison_check_ip4(pr, ia); 3129 mtx_unlock(&pr->pr_mtx); 3130 return (error); 3131 } 3132 #endif 3133 3134 #ifdef INET6 3135 static int 3136 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 3137 { 3138 int ii, ij, used; 3139 struct prison *ppr; 3140 3141 ppr = pr->pr_parent; 3142 if (!(pr->pr_flags & PR_IP6_USER)) { 3143 /* This has no user settings, so just copy the parent's list. */ 3144 if (pr->pr_ip6s < ppr->pr_ip6s) { 3145 /* 3146 * There's no room for the parent's list. Use the 3147 * new list buffer, which is assumed to be big enough 3148 * (if it was passed). If there's no buffer, try to 3149 * allocate one. 3150 */ 3151 used = 1; 3152 if (newip6 == NULL) { 3153 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 3154 M_PRISON, M_NOWAIT); 3155 if (newip6 != NULL) 3156 used = 0; 3157 } 3158 if (newip6 != NULL) { 3159 bcopy(ppr->pr_ip6, newip6, 3160 ppr->pr_ip6s * sizeof(*newip6)); 3161 free(pr->pr_ip6, M_PRISON); 3162 pr->pr_ip6 = newip6; 3163 pr->pr_ip6s = ppr->pr_ip6s; 3164 } 3165 return (used); 3166 } 3167 pr->pr_ip6s = ppr->pr_ip6s; 3168 if (pr->pr_ip6s > 0) 3169 bcopy(ppr->pr_ip6, pr->pr_ip6, 3170 pr->pr_ip6s * sizeof(*newip6)); 3171 else if (pr->pr_ip6 != NULL) { 3172 free(pr->pr_ip6, M_PRISON); 3173 pr->pr_ip6 = NULL; 3174 } 3175 } else if (pr->pr_ip6s > 0) { 3176 /* Remove addresses that aren't in the parent. */ 3177 for (ij = 0; ij < ppr->pr_ip6s; ij++) 3178 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 3179 &ppr->pr_ip6[ij])) 3180 break; 3181 if (ij < ppr->pr_ip6s) 3182 ii = 1; 3183 else { 3184 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 3185 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 3186 ii = 0; 3187 } 3188 for (ij = 1; ii < pr->pr_ip6s; ) { 3189 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 3190 &ppr->pr_ip6[0])) { 3191 ii++; 3192 continue; 3193 } 3194 switch (ij >= ppr->pr_ip6s ? -1 : 3195 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 3196 case -1: 3197 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 3198 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 3199 break; 3200 case 0: 3201 ii++; 3202 ij++; 3203 break; 3204 case 1: 3205 ij++; 3206 break; 3207 } 3208 } 3209 if (pr->pr_ip6s == 0) { 3210 pr->pr_flags |= PR_IP6_DISABLE; 3211 free(pr->pr_ip6, M_PRISON); 3212 pr->pr_ip6 = NULL; 3213 } 3214 } 3215 return 0; 3216 } 3217 3218 /* 3219 * Pass back primary IPv6 address for this jail. 3220 * 3221 * If not restricted return success but do not alter the address. Caller has 3222 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3223 * 3224 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3225 */ 3226 int 3227 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3228 { 3229 struct prison *pr; 3230 3231 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3232 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3233 3234 pr = cred->cr_prison; 3235 if (!(pr->pr_flags & PR_IP6)) 3236 return (0); 3237 mtx_lock(&pr->pr_mtx); 3238 if (!(pr->pr_flags & PR_IP6)) { 3239 mtx_unlock(&pr->pr_mtx); 3240 return (0); 3241 } 3242 if (pr->pr_ip6 == NULL) { 3243 mtx_unlock(&pr->pr_mtx); 3244 return (EAFNOSUPPORT); 3245 } 3246 3247 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3248 mtx_unlock(&pr->pr_mtx); 3249 return (0); 3250 } 3251 3252 /* 3253 * Return 1 if we should do proper source address selection or are not jailed. 3254 * We will return 0 if we should bypass source address selection in favour 3255 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3256 * returned in NBO. 3257 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3258 */ 3259 int 3260 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3261 { 3262 struct prison *pr; 3263 struct in6_addr lia6; 3264 int error; 3265 3266 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3267 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3268 3269 if (!jailed(cred)) 3270 return (1); 3271 3272 pr = cred->cr_prison; 3273 if (pr->pr_flags & PR_IP6_SADDRSEL) 3274 return (1); 3275 3276 lia6 = in6addr_any; 3277 error = prison_get_ip6(cred, &lia6); 3278 if (error) 3279 return (error); 3280 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3281 return (1); 3282 3283 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3284 return (0); 3285 } 3286 3287 /* 3288 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3289 */ 3290 int 3291 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3292 { 3293 3294 if (pr1 == pr2) 3295 return (1); 3296 3297 while (pr1 != &prison0 && 3298 #ifdef VIMAGE 3299 !(pr1->pr_flags & PR_VNET) && 3300 #endif 3301 !(pr1->pr_flags & PR_IP6_USER)) 3302 pr1 = pr1->pr_parent; 3303 while (pr2 != &prison0 && 3304 #ifdef VIMAGE 3305 !(pr2->pr_flags & PR_VNET) && 3306 #endif 3307 !(pr2->pr_flags & PR_IP6_USER)) 3308 pr2 = pr2->pr_parent; 3309 return (pr1 == pr2); 3310 } 3311 3312 /* 3313 * Make sure our (source) address is set to something meaningful to this jail. 3314 * 3315 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3316 * when needed while binding. 3317 * 3318 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3319 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3320 * doesn't allow IPv6. 3321 */ 3322 int 3323 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3324 { 3325 struct prison *pr; 3326 int error; 3327 3328 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3329 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3330 3331 pr = cred->cr_prison; 3332 if (!(pr->pr_flags & PR_IP6)) 3333 return (0); 3334 mtx_lock(&pr->pr_mtx); 3335 if (!(pr->pr_flags & PR_IP6)) { 3336 mtx_unlock(&pr->pr_mtx); 3337 return (0); 3338 } 3339 if (pr->pr_ip6 == NULL) { 3340 mtx_unlock(&pr->pr_mtx); 3341 return (EAFNOSUPPORT); 3342 } 3343 3344 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3345 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3346 mtx_unlock(&pr->pr_mtx); 3347 return (0); 3348 } 3349 3350 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3351 /* 3352 * In case there is only 1 IPv6 address, and v6only is true, 3353 * then bind directly. 3354 */ 3355 if (v6only != 0 && pr->pr_ip6s == 1) 3356 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3357 mtx_unlock(&pr->pr_mtx); 3358 return (0); 3359 } 3360 3361 error = _prison_check_ip6(pr, ia6); 3362 mtx_unlock(&pr->pr_mtx); 3363 return (error); 3364 } 3365 3366 /* 3367 * Rewrite destination address in case we will connect to loopback address. 3368 * 3369 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3370 */ 3371 int 3372 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3373 { 3374 struct prison *pr; 3375 3376 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3377 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3378 3379 pr = cred->cr_prison; 3380 if (!(pr->pr_flags & PR_IP6)) 3381 return (0); 3382 mtx_lock(&pr->pr_mtx); 3383 if (!(pr->pr_flags & PR_IP6)) { 3384 mtx_unlock(&pr->pr_mtx); 3385 return (0); 3386 } 3387 if (pr->pr_ip6 == NULL) { 3388 mtx_unlock(&pr->pr_mtx); 3389 return (EAFNOSUPPORT); 3390 } 3391 3392 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3393 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3394 mtx_unlock(&pr->pr_mtx); 3395 return (0); 3396 } 3397 3398 /* 3399 * Return success because nothing had to be changed. 3400 */ 3401 mtx_unlock(&pr->pr_mtx); 3402 return (0); 3403 } 3404 3405 /* 3406 * Check if given address belongs to the jail referenced by cred/prison. 3407 * 3408 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3409 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3410 * doesn't allow IPv6. 3411 */ 3412 static int 3413 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3414 { 3415 int i, a, z, d; 3416 3417 /* 3418 * Check the primary IP. 3419 */ 3420 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3421 return (0); 3422 3423 /* 3424 * All the other IPs are sorted so we can do a binary search. 3425 */ 3426 a = 0; 3427 z = pr->pr_ip6s - 2; 3428 while (a <= z) { 3429 i = (a + z) / 2; 3430 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3431 if (d > 0) 3432 z = i - 1; 3433 else if (d < 0) 3434 a = i + 1; 3435 else 3436 return (0); 3437 } 3438 3439 return (EADDRNOTAVAIL); 3440 } 3441 3442 int 3443 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3444 { 3445 struct prison *pr; 3446 int error; 3447 3448 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3449 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3450 3451 pr = cred->cr_prison; 3452 if (!(pr->pr_flags & PR_IP6)) 3453 return (0); 3454 mtx_lock(&pr->pr_mtx); 3455 if (!(pr->pr_flags & PR_IP6)) { 3456 mtx_unlock(&pr->pr_mtx); 3457 return (0); 3458 } 3459 if (pr->pr_ip6 == NULL) { 3460 mtx_unlock(&pr->pr_mtx); 3461 return (EAFNOSUPPORT); 3462 } 3463 3464 error = _prison_check_ip6(pr, ia6); 3465 mtx_unlock(&pr->pr_mtx); 3466 return (error); 3467 } 3468 #endif 3469 3470 /* 3471 * Check if a jail supports the given address family. 3472 * 3473 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3474 * if not. 3475 */ 3476 int 3477 prison_check_af(struct ucred *cred, int af) 3478 { 3479 struct prison *pr; 3480 int error; 3481 3482 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3483 3484 pr = cred->cr_prison; 3485 #ifdef VIMAGE 3486 /* Prisons with their own network stack are not limited. */ 3487 if (prison_owns_vnet(cred)) 3488 return (0); 3489 #endif 3490 3491 error = 0; 3492 switch (af) 3493 { 3494 #ifdef INET 3495 case AF_INET: 3496 if (pr->pr_flags & PR_IP4) 3497 { 3498 mtx_lock(&pr->pr_mtx); 3499 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3500 error = EAFNOSUPPORT; 3501 mtx_unlock(&pr->pr_mtx); 3502 } 3503 break; 3504 #endif 3505 #ifdef INET6 3506 case AF_INET6: 3507 if (pr->pr_flags & PR_IP6) 3508 { 3509 mtx_lock(&pr->pr_mtx); 3510 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3511 error = EAFNOSUPPORT; 3512 mtx_unlock(&pr->pr_mtx); 3513 } 3514 break; 3515 #endif 3516 case AF_LOCAL: 3517 case AF_ROUTE: 3518 break; 3519 default: 3520 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3521 error = EAFNOSUPPORT; 3522 } 3523 return (error); 3524 } 3525 3526 /* 3527 * Check if given address belongs to the jail referenced by cred (wrapper to 3528 * prison_check_ip[46]). 3529 * 3530 * Returns 0 if jail doesn't restrict the address family or if address belongs 3531 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3532 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3533 */ 3534 int 3535 prison_if(struct ucred *cred, struct sockaddr *sa) 3536 { 3537 #ifdef INET 3538 struct sockaddr_in *sai; 3539 #endif 3540 #ifdef INET6 3541 struct sockaddr_in6 *sai6; 3542 #endif 3543 int error; 3544 3545 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3546 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3547 3548 #ifdef VIMAGE 3549 if (prison_owns_vnet(cred)) 3550 return (0); 3551 #endif 3552 3553 error = 0; 3554 switch (sa->sa_family) 3555 { 3556 #ifdef INET 3557 case AF_INET: 3558 sai = (struct sockaddr_in *)sa; 3559 error = prison_check_ip4(cred, &sai->sin_addr); 3560 break; 3561 #endif 3562 #ifdef INET6 3563 case AF_INET6: 3564 sai6 = (struct sockaddr_in6 *)sa; 3565 error = prison_check_ip6(cred, &sai6->sin6_addr); 3566 break; 3567 #endif 3568 default: 3569 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3570 error = EAFNOSUPPORT; 3571 } 3572 return (error); 3573 } 3574 3575 /* 3576 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3577 */ 3578 int 3579 prison_check(struct ucred *cred1, struct ucred *cred2) 3580 { 3581 3582 return ((cred1->cr_prison == cred2->cr_prison || 3583 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3584 } 3585 3586 /* 3587 * Return 1 if p2 is a child of p1, otherwise 0. 3588 */ 3589 int 3590 prison_ischild(struct prison *pr1, struct prison *pr2) 3591 { 3592 3593 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3594 if (pr1 == pr2) 3595 return (1); 3596 return (0); 3597 } 3598 3599 /* 3600 * Return 1 if the passed credential is in a jail, otherwise 0. 3601 */ 3602 int 3603 jailed(struct ucred *cred) 3604 { 3605 3606 return (cred->cr_prison != &prison0); 3607 } 3608 3609 /* 3610 * Return 1 if the passed credential is in a jail and that jail does not 3611 * have its own virtual network stack, otherwise 0. 3612 */ 3613 int 3614 jailed_without_vnet(struct ucred *cred) 3615 { 3616 3617 if (!jailed(cred)) 3618 return (0); 3619 #ifdef VIMAGE 3620 if (prison_owns_vnet(cred)) 3621 return (0); 3622 #endif 3623 3624 return (1); 3625 } 3626 3627 /* 3628 * Return the correct hostname (domainname, et al) for the passed credential. 3629 */ 3630 void 3631 getcredhostname(struct ucred *cred, char *buf, size_t size) 3632 { 3633 struct prison *pr; 3634 3635 /* 3636 * A NULL credential can be used to shortcut to the physical 3637 * system's hostname. 3638 */ 3639 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3640 mtx_lock(&pr->pr_mtx); 3641 strlcpy(buf, pr->pr_hostname, size); 3642 mtx_unlock(&pr->pr_mtx); 3643 } 3644 3645 void 3646 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3647 { 3648 3649 mtx_lock(&cred->cr_prison->pr_mtx); 3650 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3651 mtx_unlock(&cred->cr_prison->pr_mtx); 3652 } 3653 3654 void 3655 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3656 { 3657 3658 mtx_lock(&cred->cr_prison->pr_mtx); 3659 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3660 mtx_unlock(&cred->cr_prison->pr_mtx); 3661 } 3662 3663 void 3664 getcredhostid(struct ucred *cred, unsigned long *hostid) 3665 { 3666 3667 mtx_lock(&cred->cr_prison->pr_mtx); 3668 *hostid = cred->cr_prison->pr_hostid; 3669 mtx_unlock(&cred->cr_prison->pr_mtx); 3670 } 3671 3672 #ifdef VIMAGE 3673 /* 3674 * Determine whether the prison represented by cred owns 3675 * its vnet rather than having it inherited. 3676 * 3677 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3678 */ 3679 int 3680 prison_owns_vnet(struct ucred *cred) 3681 { 3682 3683 /* 3684 * vnets cannot be added/removed after jail creation, 3685 * so no need to lock here. 3686 */ 3687 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3688 } 3689 #endif 3690 3691 /* 3692 * Determine whether the subject represented by cred can "see" 3693 * status of a mount point. 3694 * Returns: 0 for permitted, ENOENT otherwise. 3695 * XXX: This function should be called cr_canseemount() and should be 3696 * placed in kern_prot.c. 3697 */ 3698 int 3699 prison_canseemount(struct ucred *cred, struct mount *mp) 3700 { 3701 struct prison *pr; 3702 struct statfs *sp; 3703 size_t len; 3704 3705 pr = cred->cr_prison; 3706 if (pr->pr_enforce_statfs == 0) 3707 return (0); 3708 if (pr->pr_root->v_mount == mp) 3709 return (0); 3710 if (pr->pr_enforce_statfs == 2) 3711 return (ENOENT); 3712 /* 3713 * If jail's chroot directory is set to "/" we should be able to see 3714 * all mount-points from inside a jail. 3715 * This is ugly check, but this is the only situation when jail's 3716 * directory ends with '/'. 3717 */ 3718 if (strcmp(pr->pr_path, "/") == 0) 3719 return (0); 3720 len = strlen(pr->pr_path); 3721 sp = &mp->mnt_stat; 3722 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3723 return (ENOENT); 3724 /* 3725 * Be sure that we don't have situation where jail's root directory 3726 * is "/some/path" and mount point is "/some/pathpath". 3727 */ 3728 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3729 return (ENOENT); 3730 return (0); 3731 } 3732 3733 void 3734 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3735 { 3736 char jpath[MAXPATHLEN]; 3737 struct prison *pr; 3738 size_t len; 3739 3740 pr = cred->cr_prison; 3741 if (pr->pr_enforce_statfs == 0) 3742 return; 3743 if (prison_canseemount(cred, mp) != 0) { 3744 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3745 strlcpy(sp->f_mntonname, "[restricted]", 3746 sizeof(sp->f_mntonname)); 3747 return; 3748 } 3749 if (pr->pr_root->v_mount == mp) { 3750 /* 3751 * Clear current buffer data, so we are sure nothing from 3752 * the valid path left there. 3753 */ 3754 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3755 *sp->f_mntonname = '/'; 3756 return; 3757 } 3758 /* 3759 * If jail's chroot directory is set to "/" we should be able to see 3760 * all mount-points from inside a jail. 3761 */ 3762 if (strcmp(pr->pr_path, "/") == 0) 3763 return; 3764 len = strlen(pr->pr_path); 3765 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3766 /* 3767 * Clear current buffer data, so we are sure nothing from 3768 * the valid path left there. 3769 */ 3770 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3771 if (*jpath == '\0') { 3772 /* Should never happen. */ 3773 *sp->f_mntonname = '/'; 3774 } else { 3775 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3776 } 3777 } 3778 3779 /* 3780 * Check with permission for a specific privilege is granted within jail. We 3781 * have a specific list of accepted privileges; the rest are denied. 3782 */ 3783 int 3784 prison_priv_check(struct ucred *cred, int priv) 3785 { 3786 3787 if (!jailed(cred)) 3788 return (0); 3789 3790 #ifdef VIMAGE 3791 /* 3792 * Privileges specific to prisons with a virtual network stack. 3793 * There might be a duplicate entry here in case the privilege 3794 * is only granted conditionally in the legacy jail case. 3795 */ 3796 switch (priv) { 3797 #ifdef notyet 3798 /* 3799 * NFS-specific privileges. 3800 */ 3801 case PRIV_NFS_DAEMON: 3802 case PRIV_NFS_LOCKD: 3803 #endif 3804 /* 3805 * Network stack privileges. 3806 */ 3807 case PRIV_NET_BRIDGE: 3808 case PRIV_NET_GRE: 3809 case PRIV_NET_BPF: 3810 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3811 case PRIV_NET_ROUTE: 3812 case PRIV_NET_TAP: 3813 case PRIV_NET_SETIFMTU: 3814 case PRIV_NET_SETIFFLAGS: 3815 case PRIV_NET_SETIFCAP: 3816 case PRIV_NET_SETIFDESCR: 3817 case PRIV_NET_SETIFNAME : 3818 case PRIV_NET_SETIFMETRIC: 3819 case PRIV_NET_SETIFPHYS: 3820 case PRIV_NET_SETIFMAC: 3821 case PRIV_NET_ADDMULTI: 3822 case PRIV_NET_DELMULTI: 3823 case PRIV_NET_HWIOCTL: 3824 case PRIV_NET_SETLLADDR: 3825 case PRIV_NET_ADDIFGROUP: 3826 case PRIV_NET_DELIFGROUP: 3827 case PRIV_NET_IFCREATE: 3828 case PRIV_NET_IFDESTROY: 3829 case PRIV_NET_ADDIFADDR: 3830 case PRIV_NET_DELIFADDR: 3831 case PRIV_NET_LAGG: 3832 case PRIV_NET_GIF: 3833 case PRIV_NET_SETIFVNET: 3834 case PRIV_NET_SETIFFIB: 3835 3836 /* 3837 * 802.11-related privileges. 3838 */ 3839 case PRIV_NET80211_GETKEY: 3840 #ifdef notyet 3841 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3842 #endif 3843 3844 #ifdef notyet 3845 /* 3846 * AppleTalk privileges. 3847 */ 3848 case PRIV_NETATALK_RESERVEDPORT: 3849 3850 /* 3851 * ATM privileges. 3852 */ 3853 case PRIV_NETATM_CFG: 3854 case PRIV_NETATM_ADD: 3855 case PRIV_NETATM_DEL: 3856 case PRIV_NETATM_SET: 3857 3858 /* 3859 * Bluetooth privileges. 3860 */ 3861 case PRIV_NETBLUETOOTH_RAW: 3862 #endif 3863 3864 /* 3865 * Netgraph and netgraph module privileges. 3866 */ 3867 case PRIV_NETGRAPH_CONTROL: 3868 #ifdef notyet 3869 case PRIV_NETGRAPH_TTY: 3870 #endif 3871 3872 /* 3873 * IPv4 and IPv6 privileges. 3874 */ 3875 case PRIV_NETINET_IPFW: 3876 case PRIV_NETINET_DIVERT: 3877 case PRIV_NETINET_PF: 3878 case PRIV_NETINET_DUMMYNET: 3879 case PRIV_NETINET_CARP: 3880 case PRIV_NETINET_MROUTE: 3881 case PRIV_NETINET_RAW: 3882 case PRIV_NETINET_ADDRCTRL6: 3883 case PRIV_NETINET_ND6: 3884 case PRIV_NETINET_SCOPE6: 3885 case PRIV_NETINET_ALIFETIME6: 3886 case PRIV_NETINET_IPSEC: 3887 case PRIV_NETINET_BINDANY: 3888 3889 #ifdef notyet 3890 /* 3891 * IPX/SPX privileges. 3892 */ 3893 case PRIV_NETIPX_RESERVEDPORT: 3894 case PRIV_NETIPX_RAW: 3895 3896 /* 3897 * NCP privileges. 3898 */ 3899 case PRIV_NETNCP: 3900 3901 /* 3902 * SMB privileges. 3903 */ 3904 case PRIV_NETSMB: 3905 #endif 3906 3907 /* 3908 * No default: or deny here. 3909 * In case of no permit fall through to next switch(). 3910 */ 3911 if (cred->cr_prison->pr_flags & PR_VNET) 3912 return (0); 3913 } 3914 #endif /* VIMAGE */ 3915 3916 switch (priv) { 3917 3918 /* 3919 * Allow ktrace privileges for root in jail. 3920 */ 3921 case PRIV_KTRACE: 3922 3923 #if 0 3924 /* 3925 * Allow jailed processes to configure audit identity and 3926 * submit audit records (login, etc). In the future we may 3927 * want to further refine the relationship between audit and 3928 * jail. 3929 */ 3930 case PRIV_AUDIT_GETAUDIT: 3931 case PRIV_AUDIT_SETAUDIT: 3932 case PRIV_AUDIT_SUBMIT: 3933 #endif 3934 3935 /* 3936 * Allow jailed processes to manipulate process UNIX 3937 * credentials in any way they see fit. 3938 */ 3939 case PRIV_CRED_SETUID: 3940 case PRIV_CRED_SETEUID: 3941 case PRIV_CRED_SETGID: 3942 case PRIV_CRED_SETEGID: 3943 case PRIV_CRED_SETGROUPS: 3944 case PRIV_CRED_SETREUID: 3945 case PRIV_CRED_SETREGID: 3946 case PRIV_CRED_SETRESUID: 3947 case PRIV_CRED_SETRESGID: 3948 3949 /* 3950 * Jail implements visibility constraints already, so allow 3951 * jailed root to override uid/gid-based constraints. 3952 */ 3953 case PRIV_SEEOTHERGIDS: 3954 case PRIV_SEEOTHERUIDS: 3955 3956 /* 3957 * Jail implements inter-process debugging limits already, so 3958 * allow jailed root various debugging privileges. 3959 */ 3960 case PRIV_DEBUG_DIFFCRED: 3961 case PRIV_DEBUG_SUGID: 3962 case PRIV_DEBUG_UNPRIV: 3963 3964 /* 3965 * Allow jail to set various resource limits and login 3966 * properties, and for now, exceed process resource limits. 3967 */ 3968 case PRIV_PROC_LIMIT: 3969 case PRIV_PROC_SETLOGIN: 3970 case PRIV_PROC_SETRLIMIT: 3971 3972 /* 3973 * System V and POSIX IPC privileges are granted in jail. 3974 */ 3975 case PRIV_IPC_READ: 3976 case PRIV_IPC_WRITE: 3977 case PRIV_IPC_ADMIN: 3978 case PRIV_IPC_MSGSIZE: 3979 case PRIV_MQ_ADMIN: 3980 3981 /* 3982 * Jail operations within a jail work on child jails. 3983 */ 3984 case PRIV_JAIL_ATTACH: 3985 case PRIV_JAIL_SET: 3986 case PRIV_JAIL_REMOVE: 3987 3988 /* 3989 * Jail implements its own inter-process limits, so allow 3990 * root processes in jail to change scheduling on other 3991 * processes in the same jail. Likewise for signalling. 3992 */ 3993 case PRIV_SCHED_DIFFCRED: 3994 case PRIV_SCHED_CPUSET: 3995 case PRIV_SIGNAL_DIFFCRED: 3996 case PRIV_SIGNAL_SUGID: 3997 3998 /* 3999 * Allow jailed processes to write to sysctls marked as jail 4000 * writable. 4001 */ 4002 case PRIV_SYSCTL_WRITEJAIL: 4003 4004 /* 4005 * Allow root in jail to manage a variety of quota 4006 * properties. These should likely be conditional on a 4007 * configuration option. 4008 */ 4009 case PRIV_VFS_GETQUOTA: 4010 case PRIV_VFS_SETQUOTA: 4011 4012 /* 4013 * Since Jail relies on chroot() to implement file system 4014 * protections, grant many VFS privileges to root in jail. 4015 * Be careful to exclude mount-related and NFS-related 4016 * privileges. 4017 */ 4018 case PRIV_VFS_READ: 4019 case PRIV_VFS_WRITE: 4020 case PRIV_VFS_ADMIN: 4021 case PRIV_VFS_EXEC: 4022 case PRIV_VFS_LOOKUP: 4023 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 4024 case PRIV_VFS_CHFLAGS_DEV: 4025 case PRIV_VFS_CHOWN: 4026 case PRIV_VFS_CHROOT: 4027 case PRIV_VFS_RETAINSUGID: 4028 case PRIV_VFS_FCHROOT: 4029 case PRIV_VFS_LINK: 4030 case PRIV_VFS_SETGID: 4031 case PRIV_VFS_STAT: 4032 case PRIV_VFS_STICKYFILE: 4033 4034 /* 4035 * As in the non-jail case, non-root users are expected to be 4036 * able to read kernel/phyiscal memory (provided /dev/[k]mem 4037 * exists in the jail and they have permission to access it). 4038 */ 4039 case PRIV_KMEM_READ: 4040 return (0); 4041 4042 /* 4043 * Depending on the global setting, allow privilege of 4044 * setting system flags. 4045 */ 4046 case PRIV_VFS_SYSFLAGS: 4047 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 4048 return (0); 4049 else 4050 return (EPERM); 4051 4052 /* 4053 * Depending on the global setting, allow privilege of 4054 * mounting/unmounting file systems. 4055 */ 4056 case PRIV_VFS_MOUNT: 4057 case PRIV_VFS_UNMOUNT: 4058 case PRIV_VFS_MOUNT_NONUSER: 4059 case PRIV_VFS_MOUNT_OWNER: 4060 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 4061 cred->cr_prison->pr_enforce_statfs < 2) 4062 return (0); 4063 else 4064 return (EPERM); 4065 4066 /* 4067 * Allow jailed root to bind reserved ports and reuse in-use 4068 * ports. 4069 */ 4070 case PRIV_NETINET_RESERVEDPORT: 4071 case PRIV_NETINET_REUSEPORT: 4072 return (0); 4073 4074 /* 4075 * Allow jailed root to set certain IPv4/6 (option) headers. 4076 */ 4077 case PRIV_NETINET_SETHDROPTS: 4078 return (0); 4079 4080 /* 4081 * Conditionally allow creating raw sockets in jail. 4082 */ 4083 case PRIV_NETINET_RAW: 4084 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 4085 return (0); 4086 else 4087 return (EPERM); 4088 4089 /* 4090 * Since jail implements its own visibility limits on netstat 4091 * sysctls, allow getcred. This allows identd to work in 4092 * jail. 4093 */ 4094 case PRIV_NETINET_GETCRED: 4095 return (0); 4096 4097 /* 4098 * Allow jailed root to set loginclass. 4099 */ 4100 case PRIV_PROC_SETLOGINCLASS: 4101 return (0); 4102 4103 default: 4104 /* 4105 * In all remaining cases, deny the privilege request. This 4106 * includes almost all network privileges, many system 4107 * configuration privileges. 4108 */ 4109 return (EPERM); 4110 } 4111 } 4112 4113 /* 4114 * Return the part of pr2's name that is relative to pr1, or the whole name 4115 * if it does not directly follow. 4116 */ 4117 4118 char * 4119 prison_name(struct prison *pr1, struct prison *pr2) 4120 { 4121 char *name; 4122 4123 /* Jails see themselves as "" (if they see themselves at all). */ 4124 if (pr1 == pr2) 4125 return ""; 4126 name = pr2->pr_name; 4127 if (prison_ischild(pr1, pr2)) { 4128 /* 4129 * pr1 isn't locked (and allprison_lock may not be either) 4130 * so its length can't be counted on. But the number of dots 4131 * can be counted on - and counted. 4132 */ 4133 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 4134 name = strchr(name, '.') + 1; 4135 } 4136 return (name); 4137 } 4138 4139 /* 4140 * Return the part of pr2's path that is relative to pr1, or the whole path 4141 * if it does not directly follow. 4142 */ 4143 static char * 4144 prison_path(struct prison *pr1, struct prison *pr2) 4145 { 4146 char *path1, *path2; 4147 int len1; 4148 4149 path1 = pr1->pr_path; 4150 path2 = pr2->pr_path; 4151 if (!strcmp(path1, "/")) 4152 return (path2); 4153 len1 = strlen(path1); 4154 if (strncmp(path1, path2, len1)) 4155 return (path2); 4156 if (path2[len1] == '\0') 4157 return "/"; 4158 if (path2[len1] == '/') 4159 return (path2 + len1); 4160 return (path2); 4161 } 4162 4163 4164 /* 4165 * Jail-related sysctls. 4166 */ 4167 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 4168 "Jails"); 4169 4170 static int 4171 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4172 { 4173 struct xprison *xp; 4174 struct prison *pr, *cpr; 4175 #ifdef INET 4176 struct in_addr *ip4 = NULL; 4177 int ip4s = 0; 4178 #endif 4179 #ifdef INET6 4180 struct in6_addr *ip6 = NULL; 4181 int ip6s = 0; 4182 #endif 4183 int descend, error; 4184 4185 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4186 pr = req->td->td_ucred->cr_prison; 4187 error = 0; 4188 sx_slock(&allprison_lock); 4189 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4190 #if defined(INET) || defined(INET6) 4191 again: 4192 #endif 4193 mtx_lock(&cpr->pr_mtx); 4194 #ifdef INET 4195 if (cpr->pr_ip4s > 0) { 4196 if (ip4s < cpr->pr_ip4s) { 4197 ip4s = cpr->pr_ip4s; 4198 mtx_unlock(&cpr->pr_mtx); 4199 ip4 = realloc(ip4, ip4s * 4200 sizeof(struct in_addr), M_TEMP, M_WAITOK); 4201 goto again; 4202 } 4203 bcopy(cpr->pr_ip4, ip4, 4204 cpr->pr_ip4s * sizeof(struct in_addr)); 4205 } 4206 #endif 4207 #ifdef INET6 4208 if (cpr->pr_ip6s > 0) { 4209 if (ip6s < cpr->pr_ip6s) { 4210 ip6s = cpr->pr_ip6s; 4211 mtx_unlock(&cpr->pr_mtx); 4212 ip6 = realloc(ip6, ip6s * 4213 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 4214 goto again; 4215 } 4216 bcopy(cpr->pr_ip6, ip6, 4217 cpr->pr_ip6s * sizeof(struct in6_addr)); 4218 } 4219 #endif 4220 if (cpr->pr_ref == 0) { 4221 mtx_unlock(&cpr->pr_mtx); 4222 continue; 4223 } 4224 bzero(xp, sizeof(*xp)); 4225 xp->pr_version = XPRISON_VERSION; 4226 xp->pr_id = cpr->pr_id; 4227 xp->pr_state = cpr->pr_uref > 0 4228 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4229 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4230 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4231 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4232 #ifdef INET 4233 xp->pr_ip4s = cpr->pr_ip4s; 4234 #endif 4235 #ifdef INET6 4236 xp->pr_ip6s = cpr->pr_ip6s; 4237 #endif 4238 mtx_unlock(&cpr->pr_mtx); 4239 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4240 if (error) 4241 break; 4242 #ifdef INET 4243 if (xp->pr_ip4s > 0) { 4244 error = SYSCTL_OUT(req, ip4, 4245 xp->pr_ip4s * sizeof(struct in_addr)); 4246 if (error) 4247 break; 4248 } 4249 #endif 4250 #ifdef INET6 4251 if (xp->pr_ip6s > 0) { 4252 error = SYSCTL_OUT(req, ip6, 4253 xp->pr_ip6s * sizeof(struct in6_addr)); 4254 if (error) 4255 break; 4256 } 4257 #endif 4258 } 4259 sx_sunlock(&allprison_lock); 4260 free(xp, M_TEMP); 4261 #ifdef INET 4262 free(ip4, M_TEMP); 4263 #endif 4264 #ifdef INET6 4265 free(ip6, M_TEMP); 4266 #endif 4267 return (error); 4268 } 4269 4270 SYSCTL_OID(_security_jail, OID_AUTO, list, 4271 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4272 sysctl_jail_list, "S", "List of active jails"); 4273 4274 static int 4275 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4276 { 4277 int error, injail; 4278 4279 injail = jailed(req->td->td_ucred); 4280 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4281 4282 return (error); 4283 } 4284 4285 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4286 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4287 sysctl_jail_jailed, "I", "Process in jail?"); 4288 4289 static int 4290 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4291 { 4292 int error, havevnet; 4293 #ifdef VIMAGE 4294 struct ucred *cred = req->td->td_ucred; 4295 4296 havevnet = jailed(cred) && prison_owns_vnet(cred); 4297 #else 4298 havevnet = 0; 4299 #endif 4300 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4301 4302 return (error); 4303 } 4304 4305 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4306 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4307 sysctl_jail_vnet, "I", "Jail owns VNET?"); 4308 4309 #if defined(INET) || defined(INET6) 4310 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4311 &jail_max_af_ips, 0, 4312 "Number of IP addresses a jail may have at most per address family (deprecated)"); 4313 #endif 4314 4315 /* 4316 * Default parameters for jail(2) compatibility. For historical reasons, 4317 * the sysctl names have varying similarity to the parameter names. Prisons 4318 * just see their own parameters, and can't change them. 4319 */ 4320 static int 4321 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4322 { 4323 struct prison *pr; 4324 int allow, error, i; 4325 4326 pr = req->td->td_ucred->cr_prison; 4327 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4328 4329 /* Get the current flag value, and convert it to a boolean. */ 4330 i = (allow & arg2) ? 1 : 0; 4331 if (arg1 != NULL) 4332 i = !i; 4333 error = sysctl_handle_int(oidp, &i, 0, req); 4334 if (error || !req->newptr) 4335 return (error); 4336 i = i ? arg2 : 0; 4337 if (arg1 != NULL) 4338 i ^= arg2; 4339 /* 4340 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4341 * for writing. 4342 */ 4343 mtx_lock(&prison0.pr_mtx); 4344 jail_default_allow = (jail_default_allow & ~arg2) | i; 4345 mtx_unlock(&prison0.pr_mtx); 4346 return (0); 4347 } 4348 4349 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4350 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4351 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4352 "Processes in jail can set their hostnames (deprecated)"); 4353 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4354 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4355 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4356 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 4357 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4358 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4359 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4360 "Processes in jail can use System V IPC primitives (deprecated)"); 4361 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4362 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4363 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4364 "Prison root can create raw sockets (deprecated)"); 4365 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4366 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4367 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4368 "Processes in jail can alter system file flags (deprecated)"); 4369 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4370 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4371 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4372 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 4373 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 4374 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4375 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 4376 "Processes in jail can mount the devfs file system (deprecated)"); 4377 SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed, 4378 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4379 NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I", 4380 "Processes in jail can mount the fdescfs file system (deprecated)"); 4381 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 4382 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4383 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 4384 "Processes in jail can mount the nullfs file system (deprecated)"); 4385 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 4386 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4387 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 4388 "Processes in jail can mount the procfs file system (deprecated)"); 4389 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linprocfs_allowed, 4390 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4391 NULL, PR_ALLOW_MOUNT_LINPROCFS, sysctl_jail_default_allow, "I", 4392 "Processes in jail can mount the linprocfs file system (deprecated)"); 4393 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linsysfs_allowed, 4394 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4395 NULL, PR_ALLOW_MOUNT_LINSYSFS, sysctl_jail_default_allow, "I", 4396 "Processes in jail can mount the linsysfs file system (deprecated)"); 4397 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed, 4398 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4399 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I", 4400 "Processes in jail can mount the tmpfs file system (deprecated)"); 4401 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 4402 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4403 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 4404 "Processes in jail can mount the zfs file system (deprecated)"); 4405 4406 static int 4407 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4408 { 4409 struct prison *pr; 4410 int level, error; 4411 4412 pr = req->td->td_ucred->cr_prison; 4413 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4414 error = sysctl_handle_int(oidp, &level, 0, req); 4415 if (error || !req->newptr) 4416 return (error); 4417 *(int *)arg1 = level; 4418 return (0); 4419 } 4420 4421 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4422 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4423 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4424 sysctl_jail_default_level, "I", 4425 "Processes in jail cannot see all mounted file systems (deprecated)"); 4426 4427 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4428 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4429 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4430 sysctl_jail_default_level, "I", 4431 "Ruleset for the devfs filesystem in jail (deprecated)"); 4432 4433 /* 4434 * Nodes to describe jail parameters. Maximum length of string parameters 4435 * is returned in the string itself, and the other parameters exist merely 4436 * to make themselves and their types known. 4437 */ 4438 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4439 "Jail parameters"); 4440 4441 int 4442 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4443 { 4444 int i; 4445 long l; 4446 size_t s; 4447 char numbuf[12]; 4448 4449 switch (oidp->oid_kind & CTLTYPE) 4450 { 4451 case CTLTYPE_LONG: 4452 case CTLTYPE_ULONG: 4453 l = 0; 4454 #ifdef SCTL_MASK32 4455 if (!(req->flags & SCTL_MASK32)) 4456 #endif 4457 return (SYSCTL_OUT(req, &l, sizeof(l))); 4458 case CTLTYPE_INT: 4459 case CTLTYPE_UINT: 4460 i = 0; 4461 return (SYSCTL_OUT(req, &i, sizeof(i))); 4462 case CTLTYPE_STRING: 4463 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4464 return 4465 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4466 case CTLTYPE_STRUCT: 4467 s = (size_t)arg2; 4468 return (SYSCTL_OUT(req, &s, sizeof(s))); 4469 } 4470 return (0); 4471 } 4472 4473 /* 4474 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 4475 * jail creation time but cannot be changed in an existing jail. 4476 */ 4477 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4478 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4479 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4480 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4481 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4482 "I", "Jail secure level"); 4483 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 4484 "Jail value for kern.osreldate and uname -K"); 4485 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 4486 "Jail value for kern.osrelease and uname -r"); 4487 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4488 "I", "Jail cannot see all mounted file systems"); 4489 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4490 "I", "Ruleset for in-jail devfs mounts"); 4491 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4492 "B", "Jail persistence"); 4493 #ifdef VIMAGE 4494 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4495 "E,jailsys", "Virtual network stack"); 4496 #endif 4497 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4498 "B", "Jail is in the process of shutting down"); 4499 4500 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4501 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4502 "I", "Current number of child jails"); 4503 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4504 "I", "Maximum number of child jails"); 4505 4506 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4507 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4508 "Jail hostname"); 4509 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4510 "Jail NIS domainname"); 4511 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4512 "Jail host UUID"); 4513 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4514 "LU", "Jail host ID"); 4515 4516 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4517 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4518 4519 #ifdef INET 4520 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4521 "Jail IPv4 address virtualization"); 4522 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4523 "S,in_addr,a", "Jail IPv4 addresses"); 4524 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4525 "B", "Do (not) use IPv4 source address selection rather than the " 4526 "primary jail IPv4 address."); 4527 #endif 4528 #ifdef INET6 4529 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4530 "Jail IPv6 address virtualization"); 4531 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4532 "S,in6_addr,a", "Jail IPv6 addresses"); 4533 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4534 "B", "Do (not) use IPv6 source address selection rather than the " 4535 "primary jail IPv6 address."); 4536 #endif 4537 4538 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4539 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4540 "B", "Jail may set hostname"); 4541 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4542 "B", "Jail may use SYSV IPC"); 4543 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4544 "B", "Jail may create raw sockets"); 4545 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4546 "B", "Jail may alter system file flags"); 4547 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4548 "B", "Jail may set file quotas"); 4549 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4550 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4551 4552 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4553 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4554 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4555 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 4556 "B", "Jail may mount the devfs file system"); 4557 SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW, 4558 "B", "Jail may mount the fdescfs file system"); 4559 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 4560 "B", "Jail may mount the nullfs file system"); 4561 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 4562 "B", "Jail may mount the procfs file system"); 4563 SYSCTL_JAIL_PARAM(_allow_mount, linprocfs, CTLTYPE_INT | CTLFLAG_RW, 4564 "B", "Jail may mount the linprocfs file system"); 4565 SYSCTL_JAIL_PARAM(_allow_mount, linsysfs, CTLTYPE_INT | CTLFLAG_RW, 4566 "B", "Jail may mount the linsysfs file system"); 4567 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW, 4568 "B", "Jail may mount the tmpfs file system"); 4569 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 4570 "B", "Jail may mount the zfs file system"); 4571 4572 #ifdef RACCT 4573 void 4574 prison_racct_foreach(void (*callback)(struct racct *racct, 4575 void *arg2, void *arg3), void *arg2, void *arg3) 4576 { 4577 struct prison_racct *prr; 4578 4579 ASSERT_RACCT_ENABLED(); 4580 4581 sx_slock(&allprison_lock); 4582 LIST_FOREACH(prr, &allprison_racct, prr_next) 4583 (callback)(prr->prr_racct, arg2, arg3); 4584 sx_sunlock(&allprison_lock); 4585 } 4586 4587 static struct prison_racct * 4588 prison_racct_find_locked(const char *name) 4589 { 4590 struct prison_racct *prr; 4591 4592 ASSERT_RACCT_ENABLED(); 4593 sx_assert(&allprison_lock, SA_XLOCKED); 4594 4595 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4596 return (NULL); 4597 4598 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4599 if (strcmp(name, prr->prr_name) != 0) 4600 continue; 4601 4602 /* Found prison_racct with a matching name? */ 4603 prison_racct_hold(prr); 4604 return (prr); 4605 } 4606 4607 /* Add new prison_racct. */ 4608 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4609 racct_create(&prr->prr_racct); 4610 4611 strcpy(prr->prr_name, name); 4612 refcount_init(&prr->prr_refcount, 1); 4613 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4614 4615 return (prr); 4616 } 4617 4618 struct prison_racct * 4619 prison_racct_find(const char *name) 4620 { 4621 struct prison_racct *prr; 4622 4623 ASSERT_RACCT_ENABLED(); 4624 4625 sx_xlock(&allprison_lock); 4626 prr = prison_racct_find_locked(name); 4627 sx_xunlock(&allprison_lock); 4628 return (prr); 4629 } 4630 4631 void 4632 prison_racct_hold(struct prison_racct *prr) 4633 { 4634 4635 ASSERT_RACCT_ENABLED(); 4636 4637 refcount_acquire(&prr->prr_refcount); 4638 } 4639 4640 static void 4641 prison_racct_free_locked(struct prison_racct *prr) 4642 { 4643 4644 ASSERT_RACCT_ENABLED(); 4645 sx_assert(&allprison_lock, SA_XLOCKED); 4646 4647 if (refcount_release(&prr->prr_refcount)) { 4648 racct_destroy(&prr->prr_racct); 4649 LIST_REMOVE(prr, prr_next); 4650 free(prr, M_PRISON_RACCT); 4651 } 4652 } 4653 4654 void 4655 prison_racct_free(struct prison_racct *prr) 4656 { 4657 int old; 4658 4659 ASSERT_RACCT_ENABLED(); 4660 sx_assert(&allprison_lock, SA_UNLOCKED); 4661 4662 old = prr->prr_refcount; 4663 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4664 return; 4665 4666 sx_xlock(&allprison_lock); 4667 prison_racct_free_locked(prr); 4668 sx_xunlock(&allprison_lock); 4669 } 4670 4671 static void 4672 prison_racct_attach(struct prison *pr) 4673 { 4674 struct prison_racct *prr; 4675 4676 ASSERT_RACCT_ENABLED(); 4677 sx_assert(&allprison_lock, SA_XLOCKED); 4678 4679 prr = prison_racct_find_locked(pr->pr_name); 4680 KASSERT(prr != NULL, ("cannot find prison_racct")); 4681 4682 pr->pr_prison_racct = prr; 4683 } 4684 4685 /* 4686 * Handle jail renaming. From the racct point of view, renaming means 4687 * moving from one prison_racct to another. 4688 */ 4689 static void 4690 prison_racct_modify(struct prison *pr) 4691 { 4692 struct proc *p; 4693 struct ucred *cred; 4694 struct prison_racct *oldprr; 4695 4696 ASSERT_RACCT_ENABLED(); 4697 4698 sx_slock(&allproc_lock); 4699 sx_xlock(&allprison_lock); 4700 4701 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4702 sx_xunlock(&allprison_lock); 4703 sx_sunlock(&allproc_lock); 4704 return; 4705 } 4706 4707 oldprr = pr->pr_prison_racct; 4708 pr->pr_prison_racct = NULL; 4709 4710 prison_racct_attach(pr); 4711 4712 /* 4713 * Move resource utilisation records. 4714 */ 4715 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4716 4717 /* 4718 * Force rctl to reattach rules to processes. 4719 */ 4720 FOREACH_PROC_IN_SYSTEM(p) { 4721 PROC_LOCK(p); 4722 cred = crhold(p->p_ucred); 4723 PROC_UNLOCK(p); 4724 racct_proc_ucred_changed(p, cred, cred); 4725 crfree(cred); 4726 } 4727 4728 sx_sunlock(&allproc_lock); 4729 prison_racct_free_locked(oldprr); 4730 sx_xunlock(&allprison_lock); 4731 } 4732 4733 static void 4734 prison_racct_detach(struct prison *pr) 4735 { 4736 4737 ASSERT_RACCT_ENABLED(); 4738 sx_assert(&allprison_lock, SA_UNLOCKED); 4739 4740 if (pr->pr_prison_racct == NULL) 4741 return; 4742 prison_racct_free(pr->pr_prison_racct); 4743 pr->pr_prison_racct = NULL; 4744 } 4745 #endif /* RACCT */ 4746 4747 #ifdef DDB 4748 4749 static void 4750 db_show_prison(struct prison *pr) 4751 { 4752 int fi; 4753 #if defined(INET) || defined(INET6) 4754 int ii; 4755 #endif 4756 unsigned jsf; 4757 #ifdef INET6 4758 char ip6buf[INET6_ADDRSTRLEN]; 4759 #endif 4760 4761 db_printf("prison %p:\n", pr); 4762 db_printf(" jid = %d\n", pr->pr_id); 4763 db_printf(" name = %s\n", pr->pr_name); 4764 db_printf(" parent = %p\n", pr->pr_parent); 4765 db_printf(" ref = %d\n", pr->pr_ref); 4766 db_printf(" uref = %d\n", pr->pr_uref); 4767 db_printf(" path = %s\n", pr->pr_path); 4768 db_printf(" cpuset = %d\n", pr->pr_cpuset 4769 ? pr->pr_cpuset->cs_id : -1); 4770 #ifdef VIMAGE 4771 db_printf(" vnet = %p\n", pr->pr_vnet); 4772 #endif 4773 db_printf(" root = %p\n", pr->pr_root); 4774 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4775 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4776 db_printf(" children.max = %d\n", pr->pr_childmax); 4777 db_printf(" children.cur = %d\n", pr->pr_childcount); 4778 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4779 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4780 db_printf(" flags = 0x%x", pr->pr_flags); 4781 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4782 fi++) 4783 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4784 db_printf(" %s", pr_flag_names[fi]); 4785 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4786 fi++) { 4787 jsf = pr->pr_flags & 4788 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4789 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4790 pr_flag_jailsys[fi].disable && 4791 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4792 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4793 : "inherit"); 4794 } 4795 db_printf(" allow = 0x%x", pr->pr_allow); 4796 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4797 fi++) 4798 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4799 db_printf(" %s", pr_allow_names[fi]); 4800 db_printf("\n"); 4801 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4802 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4803 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4804 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4805 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4806 #ifdef INET 4807 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4808 for (ii = 0; ii < pr->pr_ip4s; ii++) 4809 db_printf(" %s %s\n", 4810 ii == 0 ? "ip4.addr =" : " ", 4811 inet_ntoa(pr->pr_ip4[ii])); 4812 #endif 4813 #ifdef INET6 4814 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4815 for (ii = 0; ii < pr->pr_ip6s; ii++) 4816 db_printf(" %s %s\n", 4817 ii == 0 ? "ip6.addr =" : " ", 4818 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4819 #endif 4820 } 4821 4822 DB_SHOW_COMMAND(prison, db_show_prison_command) 4823 { 4824 struct prison *pr; 4825 4826 if (!have_addr) { 4827 /* 4828 * Show all prisons in the list, and prison0 which is not 4829 * listed. 4830 */ 4831 db_show_prison(&prison0); 4832 if (!db_pager_quit) { 4833 TAILQ_FOREACH(pr, &allprison, pr_list) { 4834 db_show_prison(pr); 4835 if (db_pager_quit) 4836 break; 4837 } 4838 } 4839 return; 4840 } 4841 4842 if (addr == 0) 4843 pr = &prison0; 4844 else { 4845 /* Look for a prison with the ID and with references. */ 4846 TAILQ_FOREACH(pr, &allprison, pr_list) 4847 if (pr->pr_id == addr && pr->pr_ref > 0) 4848 break; 4849 if (pr == NULL) 4850 /* Look again, without requiring a reference. */ 4851 TAILQ_FOREACH(pr, &allprison, pr_list) 4852 if (pr->pr_id == addr) 4853 break; 4854 if (pr == NULL) 4855 /* Assume address points to a valid prison. */ 4856 pr = (struct prison *)addr; 4857 } 4858 db_show_prison(pr); 4859 } 4860 4861 #endif /* DDB */
Cache object: 77bdc607fded7ed4f8d6b3a165021373
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