Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_jail.c
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1 /*- 2 * Copyright (c) 1999 Poul-Henning Kamp. 3 * Copyright (c) 2008 Bjoern A. Zeeb. 4 * Copyright (c) 2009 James Gritton. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 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 #ifdef VIMAGE 1482 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1483 if (tppr->pr_flags & PR_VNET) 1484 break; 1485 #else 1486 tppr = &prison0; 1487 #endif 1488 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1489 if (tpr == pr || 1490 #ifdef VIMAGE 1491 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1492 #endif 1493 tpr->pr_uref == 0) { 1494 descend = 0; 1495 continue; 1496 } 1497 if (!(tpr->pr_flags & PR_IP4_USER)) 1498 continue; 1499 descend = 0; 1500 if (tpr->pr_ip4 == NULL || 1501 (ip4s == 1 && tpr->pr_ip4s == 1)) 1502 continue; 1503 for (ii = 0; ii < ip4s; ii++) { 1504 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1505 error = EADDRINUSE; 1506 vfs_opterror(opts, 1507 "IPv4 addresses clash"); 1508 goto done_deref_locked; 1509 } 1510 } 1511 } 1512 } 1513 #endif 1514 #ifdef INET6 1515 if (ip6s > 0) { 1516 if (ppr->pr_flags & PR_IP6) { 1517 /* 1518 * Make sure the new set of IP addresses is a 1519 * subset of the parent's list. 1520 */ 1521 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1522 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1523 &ppr->pr_ip6[ij])) 1524 break; 1525 if (ij == ppr->pr_ip6s) { 1526 error = EPERM; 1527 goto done_deref_locked; 1528 } 1529 if (ip6s > 1) { 1530 for (ii = ij = 1; ii < ip6s; ii++) { 1531 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1532 &ppr->pr_ip6[0])) 1533 continue; 1534 for (; ij < ppr->pr_ip6s; ij++) 1535 if (IN6_ARE_ADDR_EQUAL( 1536 &ip6[ii], &ppr->pr_ip6[ij])) 1537 break; 1538 if (ij == ppr->pr_ip6s) 1539 break; 1540 } 1541 if (ij == ppr->pr_ip6s) { 1542 error = EPERM; 1543 goto done_deref_locked; 1544 } 1545 } 1546 } 1547 /* Check for conflicting IP addresses. */ 1548 #ifdef VIMAGE 1549 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1550 if (tppr->pr_flags & PR_VNET) 1551 break; 1552 #else 1553 tppr = &prison0; 1554 #endif 1555 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1556 if (tpr == pr || 1557 #ifdef VIMAGE 1558 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1559 #endif 1560 tpr->pr_uref == 0) { 1561 descend = 0; 1562 continue; 1563 } 1564 if (!(tpr->pr_flags & PR_IP6_USER)) 1565 continue; 1566 descend = 0; 1567 if (tpr->pr_ip6 == NULL || 1568 (ip6s == 1 && tpr->pr_ip6s == 1)) 1569 continue; 1570 for (ii = 0; ii < ip6s; ii++) { 1571 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1572 error = EADDRINUSE; 1573 vfs_opterror(opts, 1574 "IPv6 addresses clash"); 1575 goto done_deref_locked; 1576 } 1577 } 1578 } 1579 } 1580 #endif 1581 onamelen = namelen = 0; 1582 if (namelc != NULL) { 1583 /* Give a default name of the jid. Also allow the name to be 1584 * explicitly the jid - but not any other number, and only in 1585 * normal form (no leading zero/etc). 1586 */ 1587 if (namelc[0] == '\0') 1588 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1589 else if ((strtoul(namelc, &p, 10) != jid || 1590 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1591 error = EINVAL; 1592 vfs_opterror(opts, 1593 "name cannot be numeric (unless it is the jid)"); 1594 goto done_deref_locked; 1595 } 1596 /* 1597 * Make sure the name isn't too long for the prison or its 1598 * children. 1599 */ 1600 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1601 onamelen = strlen(pr->pr_name + pnamelen); 1602 namelen = strlen(namelc); 1603 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1604 error = ENAMETOOLONG; 1605 goto done_deref_locked; 1606 } 1607 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1608 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1609 sizeof(pr->pr_name)) { 1610 error = ENAMETOOLONG; 1611 goto done_deref_locked; 1612 } 1613 } 1614 } 1615 if (pr_allow & ~ppr->pr_allow) { 1616 error = EPERM; 1617 goto done_deref_locked; 1618 } 1619 1620 /* 1621 * Let modules check their parameters. This requires unlocking and 1622 * then re-locking the prison, but this is still a valid state as long 1623 * as allprison_lock remains xlocked. 1624 */ 1625 mtx_unlock(&pr->pr_mtx); 1626 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1627 if (error != 0) { 1628 prison_deref(pr, created 1629 ? PD_LIST_XLOCKED 1630 : PD_DEREF | PD_LIST_XLOCKED); 1631 goto done_releroot; 1632 } 1633 mtx_lock(&pr->pr_mtx); 1634 1635 /* At this point, all valid parameters should have been noted. */ 1636 TAILQ_FOREACH(opt, opts, link) { 1637 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1638 error = EINVAL; 1639 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1640 goto done_deref_locked; 1641 } 1642 } 1643 1644 /* Set the parameters of the prison. */ 1645 #ifdef INET 1646 redo_ip4 = 0; 1647 if (pr_flags & PR_IP4_USER) { 1648 pr->pr_flags |= PR_IP4; 1649 free(pr->pr_ip4, M_PRISON); 1650 pr->pr_ip4s = ip4s; 1651 pr->pr_ip4 = ip4; 1652 ip4 = NULL; 1653 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1654 #ifdef VIMAGE 1655 if (tpr->pr_flags & PR_VNET) { 1656 descend = 0; 1657 continue; 1658 } 1659 #endif 1660 if (prison_restrict_ip4(tpr, NULL)) { 1661 redo_ip4 = 1; 1662 descend = 0; 1663 } 1664 } 1665 } 1666 #endif 1667 #ifdef INET6 1668 redo_ip6 = 0; 1669 if (pr_flags & PR_IP6_USER) { 1670 pr->pr_flags |= PR_IP6; 1671 free(pr->pr_ip6, M_PRISON); 1672 pr->pr_ip6s = ip6s; 1673 pr->pr_ip6 = ip6; 1674 ip6 = NULL; 1675 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1676 #ifdef VIMAGE 1677 if (tpr->pr_flags & PR_VNET) { 1678 descend = 0; 1679 continue; 1680 } 1681 #endif 1682 if (prison_restrict_ip6(tpr, NULL)) { 1683 redo_ip6 = 1; 1684 descend = 0; 1685 } 1686 } 1687 } 1688 #endif 1689 if (gotslevel) { 1690 pr->pr_securelevel = slevel; 1691 /* Set all child jails to be at least this level. */ 1692 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1693 if (tpr->pr_securelevel < slevel) 1694 tpr->pr_securelevel = slevel; 1695 } 1696 if (gotchildmax) { 1697 pr->pr_childmax = childmax; 1698 /* Set all child jails to under this limit. */ 1699 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1700 if (tpr->pr_childmax > childmax - level) 1701 tpr->pr_childmax = childmax > level 1702 ? childmax - level : 0; 1703 } 1704 if (gotenforce) { 1705 pr->pr_enforce_statfs = enforce; 1706 /* Pass this restriction on to the children. */ 1707 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1708 if (tpr->pr_enforce_statfs < enforce) 1709 tpr->pr_enforce_statfs = enforce; 1710 } 1711 if (gotrsnum) { 1712 pr->pr_devfs_rsnum = rsnum; 1713 /* Pass this restriction on to the children. */ 1714 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1715 tpr->pr_devfs_rsnum = rsnum; 1716 } 1717 if (namelc != NULL) { 1718 if (ppr == &prison0) 1719 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1720 else 1721 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1722 ppr->pr_name, namelc); 1723 /* Change this component of child names. */ 1724 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1725 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1726 strlen(tpr->pr_name + onamelen) + 1); 1727 bcopy(pr->pr_name, tpr->pr_name, namelen); 1728 } 1729 } 1730 if (path != NULL) { 1731 /* Try to keep a real-rooted full pathname. */ 1732 if (fullpath_disabled && path[0] == '/' && 1733 strcmp(mypr->pr_path, "/")) 1734 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1735 mypr->pr_path, path); 1736 else 1737 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1738 pr->pr_root = root; 1739 } 1740 if (PR_HOST & ch_flags & ~pr_flags) { 1741 if (pr->pr_flags & PR_HOST) { 1742 /* 1743 * Copy the parent's host info. As with pr_ip4 above, 1744 * the lack of a lock on the parent is not a problem; 1745 * it is always set with allprison_lock at least 1746 * shared, and is held exclusively here. 1747 */ 1748 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1749 sizeof(pr->pr_hostname)); 1750 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1751 sizeof(pr->pr_domainname)); 1752 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1753 sizeof(pr->pr_hostuuid)); 1754 pr->pr_hostid = pr->pr_parent->pr_hostid; 1755 } 1756 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1757 /* Set this prison, and any descendants without PR_HOST. */ 1758 if (host != NULL) 1759 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1760 if (domain != NULL) 1761 strlcpy(pr->pr_domainname, domain, 1762 sizeof(pr->pr_domainname)); 1763 if (uuid != NULL) 1764 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1765 if (gothid) 1766 pr->pr_hostid = hid; 1767 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1768 if (tpr->pr_flags & PR_HOST) 1769 descend = 0; 1770 else { 1771 if (host != NULL) 1772 strlcpy(tpr->pr_hostname, 1773 pr->pr_hostname, 1774 sizeof(tpr->pr_hostname)); 1775 if (domain != NULL) 1776 strlcpy(tpr->pr_domainname, 1777 pr->pr_domainname, 1778 sizeof(tpr->pr_domainname)); 1779 if (uuid != NULL) 1780 strlcpy(tpr->pr_hostuuid, 1781 pr->pr_hostuuid, 1782 sizeof(tpr->pr_hostuuid)); 1783 if (gothid) 1784 tpr->pr_hostid = hid; 1785 } 1786 } 1787 } 1788 if ((tallow = ch_allow & ~pr_allow)) { 1789 /* Clear allow bits in all children. */ 1790 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1791 tpr->pr_allow &= ~tallow; 1792 } 1793 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1794 /* 1795 * Persistent prisons get an extra reference, and prisons losing their 1796 * persist flag lose that reference. Only do this for existing prisons 1797 * for now, so new ones will remain unseen until after the module 1798 * handlers have completed. 1799 */ 1800 born = pr->pr_uref == 0; 1801 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1802 if (pr_flags & PR_PERSIST) { 1803 pr->pr_ref++; 1804 pr->pr_uref++; 1805 } else { 1806 pr->pr_ref--; 1807 pr->pr_uref--; 1808 } 1809 } 1810 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1811 mtx_unlock(&pr->pr_mtx); 1812 1813 #ifdef RACCT 1814 if (racct_enable && created) 1815 prison_racct_attach(pr); 1816 #endif 1817 1818 /* Locks may have prevented a complete restriction of child IP 1819 * addresses. If so, allocate some more memory and try again. 1820 */ 1821 #ifdef INET 1822 while (redo_ip4) { 1823 ip4s = pr->pr_ip4s; 1824 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1825 mtx_lock(&pr->pr_mtx); 1826 redo_ip4 = 0; 1827 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1828 #ifdef VIMAGE 1829 if (tpr->pr_flags & PR_VNET) { 1830 descend = 0; 1831 continue; 1832 } 1833 #endif 1834 if (prison_restrict_ip4(tpr, ip4)) { 1835 if (ip4 != NULL) 1836 ip4 = NULL; 1837 else 1838 redo_ip4 = 1; 1839 } 1840 } 1841 mtx_unlock(&pr->pr_mtx); 1842 } 1843 #endif 1844 #ifdef INET6 1845 while (redo_ip6) { 1846 ip6s = pr->pr_ip6s; 1847 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1848 mtx_lock(&pr->pr_mtx); 1849 redo_ip6 = 0; 1850 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1851 #ifdef VIMAGE 1852 if (tpr->pr_flags & PR_VNET) { 1853 descend = 0; 1854 continue; 1855 } 1856 #endif 1857 if (prison_restrict_ip6(tpr, ip6)) { 1858 if (ip6 != NULL) 1859 ip6 = NULL; 1860 else 1861 redo_ip6 = 1; 1862 } 1863 } 1864 mtx_unlock(&pr->pr_mtx); 1865 } 1866 #endif 1867 1868 /* Let the modules do their work. */ 1869 sx_downgrade(&allprison_lock); 1870 if (born) { 1871 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1872 if (error) { 1873 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1874 prison_deref(pr, created 1875 ? PD_LIST_SLOCKED 1876 : PD_DEREF | PD_LIST_SLOCKED); 1877 goto done_errmsg; 1878 } 1879 } 1880 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1881 if (error) { 1882 if (born) 1883 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1884 prison_deref(pr, created 1885 ? PD_LIST_SLOCKED 1886 : PD_DEREF | PD_LIST_SLOCKED); 1887 goto done_errmsg; 1888 } 1889 1890 /* Attach this process to the prison if requested. */ 1891 if (flags & JAIL_ATTACH) { 1892 mtx_lock(&pr->pr_mtx); 1893 error = do_jail_attach(td, pr); 1894 if (error) { 1895 vfs_opterror(opts, "attach failed"); 1896 if (!created) 1897 prison_deref(pr, PD_DEREF); 1898 goto done_errmsg; 1899 } 1900 } 1901 1902 #ifdef RACCT 1903 if (racct_enable && !created) { 1904 if (!(flags & JAIL_ATTACH)) 1905 sx_sunlock(&allprison_lock); 1906 prison_racct_modify(pr); 1907 if (!(flags & JAIL_ATTACH)) 1908 sx_slock(&allprison_lock); 1909 } 1910 #endif 1911 1912 td->td_retval[0] = pr->pr_id; 1913 1914 /* 1915 * Now that it is all there, drop the temporary reference from existing 1916 * prisons. Or add a reference to newly created persistent prisons 1917 * (which was not done earlier so that the prison would not be publicly 1918 * visible). 1919 */ 1920 if (!created) { 1921 prison_deref(pr, (flags & JAIL_ATTACH) 1922 ? PD_DEREF 1923 : PD_DEREF | PD_LIST_SLOCKED); 1924 } else { 1925 if (pr_flags & PR_PERSIST) { 1926 mtx_lock(&pr->pr_mtx); 1927 pr->pr_ref++; 1928 pr->pr_uref++; 1929 mtx_unlock(&pr->pr_mtx); 1930 } 1931 if (!(flags & JAIL_ATTACH)) 1932 sx_sunlock(&allprison_lock); 1933 } 1934 1935 goto done_free; 1936 1937 done_deref_locked: 1938 prison_deref(pr, created 1939 ? PD_LOCKED | PD_LIST_XLOCKED 1940 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1941 goto done_releroot; 1942 done_unlock_list: 1943 sx_xunlock(&allprison_lock); 1944 done_releroot: 1945 if (root != NULL) 1946 vrele(root); 1947 done_errmsg: 1948 if (error) { 1949 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 1950 &errmsg_len) == 0 && errmsg_len > 0) { 1951 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1952 if (optuio->uio_segflg == UIO_SYSSPACE) 1953 bcopy(errmsg, 1954 optuio->uio_iov[errmsg_pos].iov_base, 1955 errmsg_len); 1956 else 1957 copyout(errmsg, 1958 optuio->uio_iov[errmsg_pos].iov_base, 1959 errmsg_len); 1960 } 1961 } 1962 done_free: 1963 #ifdef INET 1964 free(ip4, M_PRISON); 1965 #endif 1966 #ifdef INET6 1967 free(ip6, M_PRISON); 1968 #endif 1969 if (g_path != NULL) 1970 free(g_path, M_TEMP); 1971 vfs_freeopts(opts); 1972 return (error); 1973 } 1974 1975 1976 /* 1977 * struct jail_get_args { 1978 * struct iovec *iovp; 1979 * unsigned int iovcnt; 1980 * int flags; 1981 * }; 1982 */ 1983 int 1984 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1985 { 1986 struct uio *auio; 1987 int error; 1988 1989 /* Check that we have an even number of iovecs. */ 1990 if (uap->iovcnt & 1) 1991 return (EINVAL); 1992 1993 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1994 if (error) 1995 return (error); 1996 error = kern_jail_get(td, auio, uap->flags); 1997 if (error == 0) 1998 error = copyout(auio->uio_iov, uap->iovp, 1999 uap->iovcnt * sizeof (struct iovec)); 2000 free(auio, M_IOV); 2001 return (error); 2002 } 2003 2004 int 2005 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 2006 { 2007 struct prison *pr, *mypr; 2008 struct vfsopt *opt; 2009 struct vfsoptlist *opts; 2010 char *errmsg, *name; 2011 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 2012 2013 if (flags & ~JAIL_GET_MASK) 2014 return (EINVAL); 2015 2016 /* Get the parameter list. */ 2017 error = vfs_buildopts(optuio, &opts); 2018 if (error) 2019 return (error); 2020 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 2021 mypr = td->td_ucred->cr_prison; 2022 2023 /* 2024 * Find the prison specified by one of: lastjid, jid, name. 2025 */ 2026 sx_slock(&allprison_lock); 2027 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 2028 if (error == 0) { 2029 TAILQ_FOREACH(pr, &allprison, pr_list) { 2030 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 2031 mtx_lock(&pr->pr_mtx); 2032 if (pr->pr_ref > 0 && 2033 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 2034 break; 2035 mtx_unlock(&pr->pr_mtx); 2036 } 2037 } 2038 if (pr != NULL) 2039 goto found_prison; 2040 error = ENOENT; 2041 vfs_opterror(opts, "no jail after %d", jid); 2042 goto done_unlock_list; 2043 } else if (error != ENOENT) 2044 goto done_unlock_list; 2045 2046 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 2047 if (error == 0) { 2048 if (jid != 0) { 2049 pr = prison_find_child(mypr, jid); 2050 if (pr != NULL) { 2051 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2052 mtx_unlock(&pr->pr_mtx); 2053 error = ENOENT; 2054 vfs_opterror(opts, "jail %d is dying", 2055 jid); 2056 goto done_unlock_list; 2057 } 2058 goto found_prison; 2059 } 2060 error = ENOENT; 2061 vfs_opterror(opts, "jail %d not found", jid); 2062 goto done_unlock_list; 2063 } 2064 } else if (error != ENOENT) 2065 goto done_unlock_list; 2066 2067 error = vfs_getopt(opts, "name", (void **)&name, &len); 2068 if (error == 0) { 2069 if (len == 0 || name[len - 1] != '\0') { 2070 error = EINVAL; 2071 goto done_unlock_list; 2072 } 2073 pr = prison_find_name(mypr, name); 2074 if (pr != NULL) { 2075 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2076 mtx_unlock(&pr->pr_mtx); 2077 error = ENOENT; 2078 vfs_opterror(opts, "jail \"%s\" is dying", 2079 name); 2080 goto done_unlock_list; 2081 } 2082 goto found_prison; 2083 } 2084 error = ENOENT; 2085 vfs_opterror(opts, "jail \"%s\" not found", name); 2086 goto done_unlock_list; 2087 } else if (error != ENOENT) 2088 goto done_unlock_list; 2089 2090 vfs_opterror(opts, "no jail specified"); 2091 error = ENOENT; 2092 goto done_unlock_list; 2093 2094 found_prison: 2095 /* Get the parameters of the prison. */ 2096 pr->pr_ref++; 2097 locked = PD_LOCKED; 2098 td->td_retval[0] = pr->pr_id; 2099 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2100 if (error != 0 && error != ENOENT) 2101 goto done_deref; 2102 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2103 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2104 if (error != 0 && error != ENOENT) 2105 goto done_deref; 2106 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2107 if (error != 0 && error != ENOENT) 2108 goto done_deref; 2109 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2110 sizeof(pr->pr_cpuset->cs_id)); 2111 if (error != 0 && error != ENOENT) 2112 goto done_deref; 2113 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2114 if (error != 0 && error != ENOENT) 2115 goto done_deref; 2116 #ifdef INET 2117 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2118 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2119 if (error != 0 && error != ENOENT) 2120 goto done_deref; 2121 #endif 2122 #ifdef INET6 2123 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2124 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2125 if (error != 0 && error != ENOENT) 2126 goto done_deref; 2127 #endif 2128 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2129 sizeof(pr->pr_securelevel)); 2130 if (error != 0 && error != ENOENT) 2131 goto done_deref; 2132 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2133 sizeof(pr->pr_childcount)); 2134 if (error != 0 && error != ENOENT) 2135 goto done_deref; 2136 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2137 sizeof(pr->pr_childmax)); 2138 if (error != 0 && error != ENOENT) 2139 goto done_deref; 2140 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2141 if (error != 0 && error != ENOENT) 2142 goto done_deref; 2143 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2144 if (error != 0 && error != ENOENT) 2145 goto done_deref; 2146 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2147 if (error != 0 && error != ENOENT) 2148 goto done_deref; 2149 #ifdef COMPAT_FREEBSD32 2150 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2151 uint32_t hid32 = pr->pr_hostid; 2152 2153 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2154 } else 2155 #endif 2156 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2157 sizeof(pr->pr_hostid)); 2158 if (error != 0 && error != ENOENT) 2159 goto done_deref; 2160 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2161 sizeof(pr->pr_enforce_statfs)); 2162 if (error != 0 && error != ENOENT) 2163 goto done_deref; 2164 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2165 sizeof(pr->pr_devfs_rsnum)); 2166 if (error != 0 && error != ENOENT) 2167 goto done_deref; 2168 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 2169 fi++) { 2170 if (pr_flag_names[fi] == NULL) 2171 continue; 2172 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2173 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2174 if (error != 0 && error != ENOENT) 2175 goto done_deref; 2176 i = !i; 2177 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2178 if (error != 0 && error != ENOENT) 2179 goto done_deref; 2180 } 2181 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 2182 fi++) { 2183 i = pr->pr_flags & 2184 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2185 i = pr_flag_jailsys[fi].disable && 2186 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2187 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2188 : JAIL_SYS_INHERIT; 2189 error = 2190 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2191 if (error != 0 && error != ENOENT) 2192 goto done_deref; 2193 } 2194 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 2195 fi++) { 2196 if (pr_allow_names[fi] == NULL) 2197 continue; 2198 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2199 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2200 if (error != 0 && error != ENOENT) 2201 goto done_deref; 2202 i = !i; 2203 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2204 if (error != 0 && error != ENOENT) 2205 goto done_deref; 2206 } 2207 i = (pr->pr_uref == 0); 2208 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2209 if (error != 0 && error != ENOENT) 2210 goto done_deref; 2211 i = !i; 2212 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2213 if (error != 0 && error != ENOENT) 2214 goto done_deref; 2215 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2216 sizeof(pr->pr_osreldate)); 2217 if (error != 0 && error != ENOENT) 2218 goto done_deref; 2219 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2220 if (error != 0 && error != ENOENT) 2221 goto done_deref; 2222 2223 /* Get the module parameters. */ 2224 mtx_unlock(&pr->pr_mtx); 2225 locked = 0; 2226 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2227 if (error) 2228 goto done_deref; 2229 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2230 2231 /* By now, all parameters should have been noted. */ 2232 TAILQ_FOREACH(opt, opts, link) { 2233 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2234 error = EINVAL; 2235 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2236 goto done_errmsg; 2237 } 2238 } 2239 2240 /* Write the fetched parameters back to userspace. */ 2241 error = 0; 2242 TAILQ_FOREACH(opt, opts, link) { 2243 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2244 pos = 2 * opt->pos + 1; 2245 optuio->uio_iov[pos].iov_len = opt->len; 2246 if (opt->value != NULL) { 2247 if (optuio->uio_segflg == UIO_SYSSPACE) { 2248 bcopy(opt->value, 2249 optuio->uio_iov[pos].iov_base, 2250 opt->len); 2251 } else { 2252 error = copyout(opt->value, 2253 optuio->uio_iov[pos].iov_base, 2254 opt->len); 2255 if (error) 2256 break; 2257 } 2258 } 2259 } 2260 } 2261 goto done_errmsg; 2262 2263 done_deref: 2264 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2265 goto done_errmsg; 2266 2267 done_unlock_list: 2268 sx_sunlock(&allprison_lock); 2269 done_errmsg: 2270 if (error && errmsg_pos >= 0) { 2271 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2272 errmsg_pos = 2 * errmsg_pos + 1; 2273 if (errmsg_len > 0) { 2274 if (optuio->uio_segflg == UIO_SYSSPACE) 2275 bcopy(errmsg, 2276 optuio->uio_iov[errmsg_pos].iov_base, 2277 errmsg_len); 2278 else 2279 copyout(errmsg, 2280 optuio->uio_iov[errmsg_pos].iov_base, 2281 errmsg_len); 2282 } 2283 } 2284 vfs_freeopts(opts); 2285 return (error); 2286 } 2287 2288 2289 /* 2290 * struct jail_remove_args { 2291 * int jid; 2292 * }; 2293 */ 2294 int 2295 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2296 { 2297 struct prison *pr, *cpr, *lpr, *tpr; 2298 int descend, error; 2299 2300 error = priv_check(td, PRIV_JAIL_REMOVE); 2301 if (error) 2302 return (error); 2303 2304 sx_xlock(&allprison_lock); 2305 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2306 if (pr == NULL) { 2307 sx_xunlock(&allprison_lock); 2308 return (EINVAL); 2309 } 2310 2311 /* Remove all descendants of this prison, then remove this prison. */ 2312 pr->pr_ref++; 2313 if (!LIST_EMPTY(&pr->pr_children)) { 2314 mtx_unlock(&pr->pr_mtx); 2315 lpr = NULL; 2316 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2317 mtx_lock(&cpr->pr_mtx); 2318 if (cpr->pr_ref > 0) { 2319 tpr = cpr; 2320 cpr->pr_ref++; 2321 } else { 2322 /* Already removed - do not do it again. */ 2323 tpr = NULL; 2324 } 2325 mtx_unlock(&cpr->pr_mtx); 2326 if (lpr != NULL) { 2327 mtx_lock(&lpr->pr_mtx); 2328 prison_remove_one(lpr); 2329 sx_xlock(&allprison_lock); 2330 } 2331 lpr = tpr; 2332 } 2333 if (lpr != NULL) { 2334 mtx_lock(&lpr->pr_mtx); 2335 prison_remove_one(lpr); 2336 sx_xlock(&allprison_lock); 2337 } 2338 mtx_lock(&pr->pr_mtx); 2339 } 2340 prison_remove_one(pr); 2341 return (0); 2342 } 2343 2344 static void 2345 prison_remove_one(struct prison *pr) 2346 { 2347 struct proc *p; 2348 int deuref; 2349 2350 /* If the prison was persistent, it is not anymore. */ 2351 deuref = 0; 2352 if (pr->pr_flags & PR_PERSIST) { 2353 pr->pr_ref--; 2354 deuref = PD_DEUREF; 2355 pr->pr_flags &= ~PR_PERSIST; 2356 } 2357 2358 /* 2359 * jail_remove added a reference. If that's the only one, remove 2360 * the prison now. 2361 */ 2362 KASSERT(pr->pr_ref > 0, 2363 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2364 if (pr->pr_ref == 1) { 2365 prison_deref(pr, 2366 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2367 return; 2368 } 2369 2370 mtx_unlock(&pr->pr_mtx); 2371 sx_xunlock(&allprison_lock); 2372 /* 2373 * Kill all processes unfortunate enough to be attached to this prison. 2374 */ 2375 sx_slock(&allproc_lock); 2376 LIST_FOREACH(p, &allproc, p_list) { 2377 PROC_LOCK(p); 2378 if (p->p_state != PRS_NEW && p->p_ucred && 2379 p->p_ucred->cr_prison == pr) 2380 kern_psignal(p, SIGKILL); 2381 PROC_UNLOCK(p); 2382 } 2383 sx_sunlock(&allproc_lock); 2384 /* Remove the temporary reference added by jail_remove. */ 2385 prison_deref(pr, deuref | PD_DEREF); 2386 } 2387 2388 2389 /* 2390 * struct jail_attach_args { 2391 * int jid; 2392 * }; 2393 */ 2394 int 2395 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2396 { 2397 struct prison *pr; 2398 int error; 2399 2400 error = priv_check(td, PRIV_JAIL_ATTACH); 2401 if (error) 2402 return (error); 2403 2404 /* 2405 * Start with exclusive hold on allprison_lock to ensure that a possible 2406 * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove. 2407 * But then immediately downgrade it since we don't need to stop 2408 * readers. 2409 */ 2410 sx_xlock(&allprison_lock); 2411 sx_downgrade(&allprison_lock); 2412 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2413 if (pr == NULL) { 2414 sx_sunlock(&allprison_lock); 2415 return (EINVAL); 2416 } 2417 2418 /* 2419 * Do not allow a process to attach to a prison that is not 2420 * considered to be "alive". 2421 */ 2422 if (pr->pr_uref == 0) { 2423 mtx_unlock(&pr->pr_mtx); 2424 sx_sunlock(&allprison_lock); 2425 return (EINVAL); 2426 } 2427 2428 return (do_jail_attach(td, pr)); 2429 } 2430 2431 static int 2432 do_jail_attach(struct thread *td, struct prison *pr) 2433 { 2434 struct proc *p; 2435 struct ucred *newcred, *oldcred; 2436 int error; 2437 2438 /* 2439 * XXX: Note that there is a slight race here if two threads 2440 * in the same privileged process attempt to attach to two 2441 * different jails at the same time. It is important for 2442 * user processes not to do this, or they might end up with 2443 * a process root from one prison, but attached to the jail 2444 * of another. 2445 */ 2446 pr->pr_ref++; 2447 pr->pr_uref++; 2448 mtx_unlock(&pr->pr_mtx); 2449 2450 /* Let modules do whatever they need to prepare for attaching. */ 2451 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2452 if (error) { 2453 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2454 return (error); 2455 } 2456 sx_sunlock(&allprison_lock); 2457 2458 /* 2459 * Reparent the newly attached process to this jail. 2460 */ 2461 p = td->td_proc; 2462 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2463 if (error) 2464 goto e_revert_osd; 2465 2466 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2467 if ((error = change_dir(pr->pr_root, td)) != 0) 2468 goto e_unlock; 2469 #ifdef MAC 2470 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2471 goto e_unlock; 2472 #endif 2473 VOP_UNLOCK(pr->pr_root, 0); 2474 if ((error = change_root(pr->pr_root, td))) 2475 goto e_revert_osd; 2476 2477 newcred = crget(); 2478 PROC_LOCK(p); 2479 oldcred = crcopysafe(p, newcred); 2480 newcred->cr_prison = pr; 2481 proc_set_cred(p, newcred); 2482 setsugid(p); 2483 PROC_UNLOCK(p); 2484 #ifdef RACCT 2485 racct_proc_ucred_changed(p, oldcred, newcred); 2486 #endif 2487 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF); 2488 crfree(oldcred); 2489 return (0); 2490 2491 e_unlock: 2492 VOP_UNLOCK(pr->pr_root, 0); 2493 e_revert_osd: 2494 /* Tell modules this thread is still in its old jail after all. */ 2495 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2496 prison_deref(pr, PD_DEREF | PD_DEUREF); 2497 return (error); 2498 } 2499 2500 2501 /* 2502 * Returns a locked prison instance, or NULL on failure. 2503 */ 2504 struct prison * 2505 prison_find(int prid) 2506 { 2507 struct prison *pr; 2508 2509 sx_assert(&allprison_lock, SX_LOCKED); 2510 TAILQ_FOREACH(pr, &allprison, pr_list) { 2511 if (pr->pr_id == prid) { 2512 mtx_lock(&pr->pr_mtx); 2513 if (pr->pr_ref > 0) 2514 return (pr); 2515 mtx_unlock(&pr->pr_mtx); 2516 } 2517 } 2518 return (NULL); 2519 } 2520 2521 /* 2522 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2523 */ 2524 struct prison * 2525 prison_find_child(struct prison *mypr, int prid) 2526 { 2527 struct prison *pr; 2528 int descend; 2529 2530 sx_assert(&allprison_lock, SX_LOCKED); 2531 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2532 if (pr->pr_id == prid) { 2533 mtx_lock(&pr->pr_mtx); 2534 if (pr->pr_ref > 0) 2535 return (pr); 2536 mtx_unlock(&pr->pr_mtx); 2537 } 2538 } 2539 return (NULL); 2540 } 2541 2542 /* 2543 * Look for the name relative to mypr. Returns a locked prison or NULL. 2544 */ 2545 struct prison * 2546 prison_find_name(struct prison *mypr, const char *name) 2547 { 2548 struct prison *pr, *deadpr; 2549 size_t mylen; 2550 int descend; 2551 2552 sx_assert(&allprison_lock, SX_LOCKED); 2553 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2554 again: 2555 deadpr = NULL; 2556 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2557 if (!strcmp(pr->pr_name + mylen, name)) { 2558 mtx_lock(&pr->pr_mtx); 2559 if (pr->pr_ref > 0) { 2560 if (pr->pr_uref > 0) 2561 return (pr); 2562 deadpr = pr; 2563 } 2564 mtx_unlock(&pr->pr_mtx); 2565 } 2566 } 2567 /* There was no valid prison - perhaps there was a dying one. */ 2568 if (deadpr != NULL) { 2569 mtx_lock(&deadpr->pr_mtx); 2570 if (deadpr->pr_ref == 0) { 2571 mtx_unlock(&deadpr->pr_mtx); 2572 goto again; 2573 } 2574 } 2575 return (deadpr); 2576 } 2577 2578 /* 2579 * See if a prison has the specific flag set. 2580 */ 2581 int 2582 prison_flag(struct ucred *cred, unsigned flag) 2583 { 2584 2585 /* This is an atomic read, so no locking is necessary. */ 2586 return (cred->cr_prison->pr_flags & flag); 2587 } 2588 2589 int 2590 prison_allow(struct ucred *cred, unsigned flag) 2591 { 2592 2593 /* This is an atomic read, so no locking is necessary. */ 2594 return (cred->cr_prison->pr_allow & flag); 2595 } 2596 2597 /* 2598 * Remove a prison reference. If that was the last reference, remove the 2599 * prison itself - but not in this context in case there are locks held. 2600 */ 2601 void 2602 prison_free_locked(struct prison *pr) 2603 { 2604 int ref; 2605 2606 mtx_assert(&pr->pr_mtx, MA_OWNED); 2607 ref = --pr->pr_ref; 2608 mtx_unlock(&pr->pr_mtx); 2609 if (ref == 0) 2610 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2611 } 2612 2613 void 2614 prison_free(struct prison *pr) 2615 { 2616 2617 mtx_lock(&pr->pr_mtx); 2618 prison_free_locked(pr); 2619 } 2620 2621 /* 2622 * Complete a call to either prison_free or prison_proc_free. 2623 */ 2624 static void 2625 prison_complete(void *context, int pending) 2626 { 2627 struct prison *pr = context; 2628 2629 sx_xlock(&allprison_lock); 2630 mtx_lock(&pr->pr_mtx); 2631 prison_deref(pr, pr->pr_uref 2632 ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED 2633 : PD_LOCKED | PD_LIST_XLOCKED); 2634 } 2635 2636 /* 2637 * Remove a prison reference (usually). This internal version assumes no 2638 * mutexes are held, except perhaps the prison itself. If there are no more 2639 * references, release and delist the prison. On completion, the prison lock 2640 * and the allprison lock are both unlocked. 2641 */ 2642 static void 2643 prison_deref(struct prison *pr, int flags) 2644 { 2645 struct prison *ppr, *tpr; 2646 int ref, lasturef; 2647 2648 if (!(flags & PD_LOCKED)) 2649 mtx_lock(&pr->pr_mtx); 2650 for (;;) { 2651 if (flags & PD_DEUREF) { 2652 KASSERT(pr->pr_uref > 0, 2653 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 2654 pr->pr_id)); 2655 pr->pr_uref--; 2656 lasturef = pr->pr_uref == 0; 2657 if (lasturef) 2658 pr->pr_ref++; 2659 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2660 } else 2661 lasturef = 0; 2662 if (flags & PD_DEREF) { 2663 KASSERT(pr->pr_ref > 0, 2664 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 2665 pr->pr_id)); 2666 pr->pr_ref--; 2667 } 2668 ref = pr->pr_ref; 2669 mtx_unlock(&pr->pr_mtx); 2670 2671 /* 2672 * Tell the modules if the last user reference was removed 2673 * (even it sticks around in dying state). 2674 */ 2675 if (lasturef) { 2676 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) { 2677 sx_xlock(&allprison_lock); 2678 flags |= PD_LIST_XLOCKED; 2679 } 2680 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 2681 mtx_lock(&pr->pr_mtx); 2682 ref = --pr->pr_ref; 2683 mtx_unlock(&pr->pr_mtx); 2684 } 2685 2686 /* If the prison still has references, nothing else to do. */ 2687 if (ref > 0) { 2688 if (flags & PD_LIST_SLOCKED) 2689 sx_sunlock(&allprison_lock); 2690 else if (flags & PD_LIST_XLOCKED) 2691 sx_xunlock(&allprison_lock); 2692 return; 2693 } 2694 2695 if (flags & PD_LIST_SLOCKED) { 2696 if (!sx_try_upgrade(&allprison_lock)) { 2697 sx_sunlock(&allprison_lock); 2698 sx_xlock(&allprison_lock); 2699 } 2700 } else if (!(flags & PD_LIST_XLOCKED)) 2701 sx_xlock(&allprison_lock); 2702 2703 TAILQ_REMOVE(&allprison, pr, pr_list); 2704 LIST_REMOVE(pr, pr_sibling); 2705 ppr = pr->pr_parent; 2706 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2707 tpr->pr_childcount--; 2708 sx_xunlock(&allprison_lock); 2709 2710 #ifdef VIMAGE 2711 if (pr->pr_vnet != ppr->pr_vnet) 2712 vnet_destroy(pr->pr_vnet); 2713 #endif 2714 if (pr->pr_root != NULL) 2715 vrele(pr->pr_root); 2716 mtx_destroy(&pr->pr_mtx); 2717 #ifdef INET 2718 free(pr->pr_ip4, M_PRISON); 2719 #endif 2720 #ifdef INET6 2721 free(pr->pr_ip6, M_PRISON); 2722 #endif 2723 if (pr->pr_cpuset != NULL) 2724 cpuset_rel(pr->pr_cpuset); 2725 osd_jail_exit(pr); 2726 #ifdef RACCT 2727 if (racct_enable) 2728 prison_racct_detach(pr); 2729 #endif 2730 free(pr, M_PRISON); 2731 2732 /* Removing a prison frees a reference on its parent. */ 2733 pr = ppr; 2734 mtx_lock(&pr->pr_mtx); 2735 flags = PD_DEREF | PD_DEUREF; 2736 } 2737 } 2738 2739 void 2740 prison_hold_locked(struct prison *pr) 2741 { 2742 2743 mtx_assert(&pr->pr_mtx, MA_OWNED); 2744 KASSERT(pr->pr_ref > 0, 2745 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2746 pr->pr_ref++; 2747 } 2748 2749 void 2750 prison_hold(struct prison *pr) 2751 { 2752 2753 mtx_lock(&pr->pr_mtx); 2754 prison_hold_locked(pr); 2755 mtx_unlock(&pr->pr_mtx); 2756 } 2757 2758 void 2759 prison_proc_hold(struct prison *pr) 2760 { 2761 2762 mtx_lock(&pr->pr_mtx); 2763 KASSERT(pr->pr_uref > 0, 2764 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2765 pr->pr_uref++; 2766 mtx_unlock(&pr->pr_mtx); 2767 } 2768 2769 void 2770 prison_proc_free(struct prison *pr) 2771 { 2772 2773 mtx_lock(&pr->pr_mtx); 2774 KASSERT(pr->pr_uref > 0, 2775 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2776 if (pr->pr_uref > 1) 2777 pr->pr_uref--; 2778 else { 2779 /* 2780 * Don't remove the last user reference in this context, which 2781 * is expected to be a process that is not only locked, but 2782 * also half dead. 2783 */ 2784 pr->pr_ref++; 2785 mtx_unlock(&pr->pr_mtx); 2786 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2787 return; 2788 } 2789 mtx_unlock(&pr->pr_mtx); 2790 } 2791 2792 2793 #ifdef INET 2794 /* 2795 * Restrict a prison's IP address list with its parent's, possibly replacing 2796 * it. Return true if the replacement buffer was used (or would have been). 2797 */ 2798 static int 2799 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2800 { 2801 int ii, ij, used; 2802 struct prison *ppr; 2803 2804 ppr = pr->pr_parent; 2805 if (!(pr->pr_flags & PR_IP4_USER)) { 2806 /* This has no user settings, so just copy the parent's list. */ 2807 if (pr->pr_ip4s < ppr->pr_ip4s) { 2808 /* 2809 * There's no room for the parent's list. Use the 2810 * new list buffer, which is assumed to be big enough 2811 * (if it was passed). If there's no buffer, try to 2812 * allocate one. 2813 */ 2814 used = 1; 2815 if (newip4 == NULL) { 2816 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2817 M_PRISON, M_NOWAIT); 2818 if (newip4 != NULL) 2819 used = 0; 2820 } 2821 if (newip4 != NULL) { 2822 bcopy(ppr->pr_ip4, newip4, 2823 ppr->pr_ip4s * sizeof(*newip4)); 2824 free(pr->pr_ip4, M_PRISON); 2825 pr->pr_ip4 = newip4; 2826 pr->pr_ip4s = ppr->pr_ip4s; 2827 } 2828 return (used); 2829 } 2830 pr->pr_ip4s = ppr->pr_ip4s; 2831 if (pr->pr_ip4s > 0) 2832 bcopy(ppr->pr_ip4, pr->pr_ip4, 2833 pr->pr_ip4s * sizeof(*newip4)); 2834 else if (pr->pr_ip4 != NULL) { 2835 free(pr->pr_ip4, M_PRISON); 2836 pr->pr_ip4 = NULL; 2837 } 2838 } else if (pr->pr_ip4s > 0) { 2839 /* Remove addresses that aren't in the parent. */ 2840 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2841 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2842 break; 2843 if (ij < ppr->pr_ip4s) 2844 ii = 1; 2845 else { 2846 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2847 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2848 ii = 0; 2849 } 2850 for (ij = 1; ii < pr->pr_ip4s; ) { 2851 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2852 ii++; 2853 continue; 2854 } 2855 switch (ij >= ppr->pr_ip4s ? -1 : 2856 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2857 case -1: 2858 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2859 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2860 break; 2861 case 0: 2862 ii++; 2863 ij++; 2864 break; 2865 case 1: 2866 ij++; 2867 break; 2868 } 2869 } 2870 if (pr->pr_ip4s == 0) { 2871 pr->pr_flags |= PR_IP4_DISABLE; 2872 free(pr->pr_ip4, M_PRISON); 2873 pr->pr_ip4 = NULL; 2874 } 2875 } 2876 return (0); 2877 } 2878 2879 /* 2880 * Pass back primary IPv4 address of this jail. 2881 * 2882 * If not restricted return success but do not alter the address. Caller has 2883 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2884 * 2885 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2886 * Address returned in NBO. 2887 */ 2888 int 2889 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2890 { 2891 struct prison *pr; 2892 2893 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2894 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2895 2896 pr = cred->cr_prison; 2897 if (!(pr->pr_flags & PR_IP4)) 2898 return (0); 2899 mtx_lock(&pr->pr_mtx); 2900 if (!(pr->pr_flags & PR_IP4)) { 2901 mtx_unlock(&pr->pr_mtx); 2902 return (0); 2903 } 2904 if (pr->pr_ip4 == NULL) { 2905 mtx_unlock(&pr->pr_mtx); 2906 return (EAFNOSUPPORT); 2907 } 2908 2909 ia->s_addr = pr->pr_ip4[0].s_addr; 2910 mtx_unlock(&pr->pr_mtx); 2911 return (0); 2912 } 2913 2914 /* 2915 * Return 1 if we should do proper source address selection or are not jailed. 2916 * We will return 0 if we should bypass source address selection in favour 2917 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2918 * returned in NBO. 2919 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2920 */ 2921 int 2922 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2923 { 2924 struct prison *pr; 2925 struct in_addr lia; 2926 int error; 2927 2928 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2929 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2930 2931 if (!jailed(cred)) 2932 return (1); 2933 2934 pr = cred->cr_prison; 2935 if (pr->pr_flags & PR_IP4_SADDRSEL) 2936 return (1); 2937 2938 lia.s_addr = INADDR_ANY; 2939 error = prison_get_ip4(cred, &lia); 2940 if (error) 2941 return (error); 2942 if (lia.s_addr == INADDR_ANY) 2943 return (1); 2944 2945 ia->s_addr = lia.s_addr; 2946 return (0); 2947 } 2948 2949 /* 2950 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2951 */ 2952 int 2953 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2954 { 2955 2956 if (pr1 == pr2) 2957 return (1); 2958 2959 /* 2960 * No need to lock since the PR_IP4_USER flag can't be altered for 2961 * existing prisons. 2962 */ 2963 while (pr1 != &prison0 && 2964 #ifdef VIMAGE 2965 !(pr1->pr_flags & PR_VNET) && 2966 #endif 2967 !(pr1->pr_flags & PR_IP4_USER)) 2968 pr1 = pr1->pr_parent; 2969 while (pr2 != &prison0 && 2970 #ifdef VIMAGE 2971 !(pr2->pr_flags & PR_VNET) && 2972 #endif 2973 !(pr2->pr_flags & PR_IP4_USER)) 2974 pr2 = pr2->pr_parent; 2975 return (pr1 == pr2); 2976 } 2977 2978 /* 2979 * Make sure our (source) address is set to something meaningful to this 2980 * jail. 2981 * 2982 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2983 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2984 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2985 */ 2986 int 2987 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2988 { 2989 struct prison *pr; 2990 struct in_addr ia0; 2991 int error; 2992 2993 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2994 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2995 2996 pr = cred->cr_prison; 2997 if (!(pr->pr_flags & PR_IP4)) 2998 return (0); 2999 mtx_lock(&pr->pr_mtx); 3000 if (!(pr->pr_flags & PR_IP4)) { 3001 mtx_unlock(&pr->pr_mtx); 3002 return (0); 3003 } 3004 if (pr->pr_ip4 == NULL) { 3005 mtx_unlock(&pr->pr_mtx); 3006 return (EAFNOSUPPORT); 3007 } 3008 3009 ia0.s_addr = ntohl(ia->s_addr); 3010 if (ia0.s_addr == INADDR_LOOPBACK) { 3011 ia->s_addr = pr->pr_ip4[0].s_addr; 3012 mtx_unlock(&pr->pr_mtx); 3013 return (0); 3014 } 3015 3016 if (ia0.s_addr == INADDR_ANY) { 3017 /* 3018 * In case there is only 1 IPv4 address, bind directly. 3019 */ 3020 if (pr->pr_ip4s == 1) 3021 ia->s_addr = pr->pr_ip4[0].s_addr; 3022 mtx_unlock(&pr->pr_mtx); 3023 return (0); 3024 } 3025 3026 error = _prison_check_ip4(pr, ia); 3027 mtx_unlock(&pr->pr_mtx); 3028 return (error); 3029 } 3030 3031 /* 3032 * Rewrite destination address in case we will connect to loopback address. 3033 * 3034 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 3035 * Address passed in in NBO and returned in NBO. 3036 */ 3037 int 3038 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 3039 { 3040 struct prison *pr; 3041 3042 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3043 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 3044 3045 pr = cred->cr_prison; 3046 if (!(pr->pr_flags & PR_IP4)) 3047 return (0); 3048 mtx_lock(&pr->pr_mtx); 3049 if (!(pr->pr_flags & PR_IP4)) { 3050 mtx_unlock(&pr->pr_mtx); 3051 return (0); 3052 } 3053 if (pr->pr_ip4 == NULL) { 3054 mtx_unlock(&pr->pr_mtx); 3055 return (EAFNOSUPPORT); 3056 } 3057 3058 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 3059 ia->s_addr = pr->pr_ip4[0].s_addr; 3060 mtx_unlock(&pr->pr_mtx); 3061 return (0); 3062 } 3063 3064 /* 3065 * Return success because nothing had to be changed. 3066 */ 3067 mtx_unlock(&pr->pr_mtx); 3068 return (0); 3069 } 3070 3071 /* 3072 * Check if given address belongs to the jail referenced by cred/prison. 3073 * 3074 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 3075 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3076 * doesn't allow IPv4. Address passed in in NBO. 3077 */ 3078 static int 3079 _prison_check_ip4(struct prison *pr, struct in_addr *ia) 3080 { 3081 int i, a, z, d; 3082 3083 /* 3084 * Check the primary IP. 3085 */ 3086 if (pr->pr_ip4[0].s_addr == ia->s_addr) 3087 return (0); 3088 3089 /* 3090 * All the other IPs are sorted so we can do a binary search. 3091 */ 3092 a = 0; 3093 z = pr->pr_ip4s - 2; 3094 while (a <= z) { 3095 i = (a + z) / 2; 3096 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 3097 if (d > 0) 3098 z = i - 1; 3099 else if (d < 0) 3100 a = i + 1; 3101 else 3102 return (0); 3103 } 3104 3105 return (EADDRNOTAVAIL); 3106 } 3107 3108 int 3109 prison_check_ip4(struct ucred *cred, struct in_addr *ia) 3110 { 3111 struct prison *pr; 3112 int error; 3113 3114 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3115 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 3116 3117 pr = cred->cr_prison; 3118 if (!(pr->pr_flags & PR_IP4)) 3119 return (0); 3120 mtx_lock(&pr->pr_mtx); 3121 if (!(pr->pr_flags & PR_IP4)) { 3122 mtx_unlock(&pr->pr_mtx); 3123 return (0); 3124 } 3125 if (pr->pr_ip4 == NULL) { 3126 mtx_unlock(&pr->pr_mtx); 3127 return (EAFNOSUPPORT); 3128 } 3129 3130 error = _prison_check_ip4(pr, ia); 3131 mtx_unlock(&pr->pr_mtx); 3132 return (error); 3133 } 3134 #endif 3135 3136 #ifdef INET6 3137 static int 3138 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 3139 { 3140 int ii, ij, used; 3141 struct prison *ppr; 3142 3143 ppr = pr->pr_parent; 3144 if (!(pr->pr_flags & PR_IP6_USER)) { 3145 /* This has no user settings, so just copy the parent's list. */ 3146 if (pr->pr_ip6s < ppr->pr_ip6s) { 3147 /* 3148 * There's no room for the parent's list. Use the 3149 * new list buffer, which is assumed to be big enough 3150 * (if it was passed). If there's no buffer, try to 3151 * allocate one. 3152 */ 3153 used = 1; 3154 if (newip6 == NULL) { 3155 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 3156 M_PRISON, M_NOWAIT); 3157 if (newip6 != NULL) 3158 used = 0; 3159 } 3160 if (newip6 != NULL) { 3161 bcopy(ppr->pr_ip6, newip6, 3162 ppr->pr_ip6s * sizeof(*newip6)); 3163 free(pr->pr_ip6, M_PRISON); 3164 pr->pr_ip6 = newip6; 3165 pr->pr_ip6s = ppr->pr_ip6s; 3166 } 3167 return (used); 3168 } 3169 pr->pr_ip6s = ppr->pr_ip6s; 3170 if (pr->pr_ip6s > 0) 3171 bcopy(ppr->pr_ip6, pr->pr_ip6, 3172 pr->pr_ip6s * sizeof(*newip6)); 3173 else if (pr->pr_ip6 != NULL) { 3174 free(pr->pr_ip6, M_PRISON); 3175 pr->pr_ip6 = NULL; 3176 } 3177 } else if (pr->pr_ip6s > 0) { 3178 /* Remove addresses that aren't in the parent. */ 3179 for (ij = 0; ij < ppr->pr_ip6s; ij++) 3180 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 3181 &ppr->pr_ip6[ij])) 3182 break; 3183 if (ij < ppr->pr_ip6s) 3184 ii = 1; 3185 else { 3186 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 3187 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 3188 ii = 0; 3189 } 3190 for (ij = 1; ii < pr->pr_ip6s; ) { 3191 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 3192 &ppr->pr_ip6[0])) { 3193 ii++; 3194 continue; 3195 } 3196 switch (ij >= ppr->pr_ip6s ? -1 : 3197 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 3198 case -1: 3199 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 3200 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 3201 break; 3202 case 0: 3203 ii++; 3204 ij++; 3205 break; 3206 case 1: 3207 ij++; 3208 break; 3209 } 3210 } 3211 if (pr->pr_ip6s == 0) { 3212 pr->pr_flags |= PR_IP6_DISABLE; 3213 free(pr->pr_ip6, M_PRISON); 3214 pr->pr_ip6 = NULL; 3215 } 3216 } 3217 return 0; 3218 } 3219 3220 /* 3221 * Pass back primary IPv6 address for this jail. 3222 * 3223 * If not restricted return success but do not alter the address. Caller has 3224 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3225 * 3226 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3227 */ 3228 int 3229 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3230 { 3231 struct prison *pr; 3232 3233 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3234 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3235 3236 pr = cred->cr_prison; 3237 if (!(pr->pr_flags & PR_IP6)) 3238 return (0); 3239 mtx_lock(&pr->pr_mtx); 3240 if (!(pr->pr_flags & PR_IP6)) { 3241 mtx_unlock(&pr->pr_mtx); 3242 return (0); 3243 } 3244 if (pr->pr_ip6 == NULL) { 3245 mtx_unlock(&pr->pr_mtx); 3246 return (EAFNOSUPPORT); 3247 } 3248 3249 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3250 mtx_unlock(&pr->pr_mtx); 3251 return (0); 3252 } 3253 3254 /* 3255 * Return 1 if we should do proper source address selection or are not jailed. 3256 * We will return 0 if we should bypass source address selection in favour 3257 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3258 * returned in NBO. 3259 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3260 */ 3261 int 3262 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3263 { 3264 struct prison *pr; 3265 struct in6_addr lia6; 3266 int error; 3267 3268 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3269 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3270 3271 if (!jailed(cred)) 3272 return (1); 3273 3274 pr = cred->cr_prison; 3275 if (pr->pr_flags & PR_IP6_SADDRSEL) 3276 return (1); 3277 3278 lia6 = in6addr_any; 3279 error = prison_get_ip6(cred, &lia6); 3280 if (error) 3281 return (error); 3282 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3283 return (1); 3284 3285 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3286 return (0); 3287 } 3288 3289 /* 3290 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3291 */ 3292 int 3293 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3294 { 3295 3296 if (pr1 == pr2) 3297 return (1); 3298 3299 while (pr1 != &prison0 && 3300 #ifdef VIMAGE 3301 !(pr1->pr_flags & PR_VNET) && 3302 #endif 3303 !(pr1->pr_flags & PR_IP6_USER)) 3304 pr1 = pr1->pr_parent; 3305 while (pr2 != &prison0 && 3306 #ifdef VIMAGE 3307 !(pr2->pr_flags & PR_VNET) && 3308 #endif 3309 !(pr2->pr_flags & PR_IP6_USER)) 3310 pr2 = pr2->pr_parent; 3311 return (pr1 == pr2); 3312 } 3313 3314 /* 3315 * Make sure our (source) address is set to something meaningful to this jail. 3316 * 3317 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3318 * when needed while binding. 3319 * 3320 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3321 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3322 * doesn't allow IPv6. 3323 */ 3324 int 3325 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3326 { 3327 struct prison *pr; 3328 int error; 3329 3330 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3331 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3332 3333 pr = cred->cr_prison; 3334 if (!(pr->pr_flags & PR_IP6)) 3335 return (0); 3336 mtx_lock(&pr->pr_mtx); 3337 if (!(pr->pr_flags & PR_IP6)) { 3338 mtx_unlock(&pr->pr_mtx); 3339 return (0); 3340 } 3341 if (pr->pr_ip6 == NULL) { 3342 mtx_unlock(&pr->pr_mtx); 3343 return (EAFNOSUPPORT); 3344 } 3345 3346 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3347 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3348 mtx_unlock(&pr->pr_mtx); 3349 return (0); 3350 } 3351 3352 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3353 /* 3354 * In case there is only 1 IPv6 address, and v6only is true, 3355 * then bind directly. 3356 */ 3357 if (v6only != 0 && pr->pr_ip6s == 1) 3358 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3359 mtx_unlock(&pr->pr_mtx); 3360 return (0); 3361 } 3362 3363 error = _prison_check_ip6(pr, ia6); 3364 mtx_unlock(&pr->pr_mtx); 3365 return (error); 3366 } 3367 3368 /* 3369 * Rewrite destination address in case we will connect to loopback address. 3370 * 3371 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3372 */ 3373 int 3374 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3375 { 3376 struct prison *pr; 3377 3378 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3379 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3380 3381 pr = cred->cr_prison; 3382 if (!(pr->pr_flags & PR_IP6)) 3383 return (0); 3384 mtx_lock(&pr->pr_mtx); 3385 if (!(pr->pr_flags & PR_IP6)) { 3386 mtx_unlock(&pr->pr_mtx); 3387 return (0); 3388 } 3389 if (pr->pr_ip6 == NULL) { 3390 mtx_unlock(&pr->pr_mtx); 3391 return (EAFNOSUPPORT); 3392 } 3393 3394 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3395 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3396 mtx_unlock(&pr->pr_mtx); 3397 return (0); 3398 } 3399 3400 /* 3401 * Return success because nothing had to be changed. 3402 */ 3403 mtx_unlock(&pr->pr_mtx); 3404 return (0); 3405 } 3406 3407 /* 3408 * Check if given address belongs to the jail referenced by cred/prison. 3409 * 3410 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3411 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3412 * doesn't allow IPv6. 3413 */ 3414 static int 3415 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3416 { 3417 int i, a, z, d; 3418 3419 /* 3420 * Check the primary IP. 3421 */ 3422 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3423 return (0); 3424 3425 /* 3426 * All the other IPs are sorted so we can do a binary search. 3427 */ 3428 a = 0; 3429 z = pr->pr_ip6s - 2; 3430 while (a <= z) { 3431 i = (a + z) / 2; 3432 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3433 if (d > 0) 3434 z = i - 1; 3435 else if (d < 0) 3436 a = i + 1; 3437 else 3438 return (0); 3439 } 3440 3441 return (EADDRNOTAVAIL); 3442 } 3443 3444 int 3445 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3446 { 3447 struct prison *pr; 3448 int error; 3449 3450 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3451 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3452 3453 pr = cred->cr_prison; 3454 if (!(pr->pr_flags & PR_IP6)) 3455 return (0); 3456 mtx_lock(&pr->pr_mtx); 3457 if (!(pr->pr_flags & PR_IP6)) { 3458 mtx_unlock(&pr->pr_mtx); 3459 return (0); 3460 } 3461 if (pr->pr_ip6 == NULL) { 3462 mtx_unlock(&pr->pr_mtx); 3463 return (EAFNOSUPPORT); 3464 } 3465 3466 error = _prison_check_ip6(pr, ia6); 3467 mtx_unlock(&pr->pr_mtx); 3468 return (error); 3469 } 3470 #endif 3471 3472 /* 3473 * Check if a jail supports the given address family. 3474 * 3475 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3476 * if not. 3477 */ 3478 int 3479 prison_check_af(struct ucred *cred, int af) 3480 { 3481 struct prison *pr; 3482 int error; 3483 3484 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3485 3486 pr = cred->cr_prison; 3487 #ifdef VIMAGE 3488 /* Prisons with their own network stack are not limited. */ 3489 if (prison_owns_vnet(cred)) 3490 return (0); 3491 #endif 3492 3493 error = 0; 3494 switch (af) 3495 { 3496 #ifdef INET 3497 case AF_INET: 3498 if (pr->pr_flags & PR_IP4) 3499 { 3500 mtx_lock(&pr->pr_mtx); 3501 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3502 error = EAFNOSUPPORT; 3503 mtx_unlock(&pr->pr_mtx); 3504 } 3505 break; 3506 #endif 3507 #ifdef INET6 3508 case AF_INET6: 3509 if (pr->pr_flags & PR_IP6) 3510 { 3511 mtx_lock(&pr->pr_mtx); 3512 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3513 error = EAFNOSUPPORT; 3514 mtx_unlock(&pr->pr_mtx); 3515 } 3516 break; 3517 #endif 3518 case AF_LOCAL: 3519 case AF_ROUTE: 3520 break; 3521 default: 3522 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3523 error = EAFNOSUPPORT; 3524 } 3525 return (error); 3526 } 3527 3528 /* 3529 * Check if given address belongs to the jail referenced by cred (wrapper to 3530 * prison_check_ip[46]). 3531 * 3532 * Returns 0 if jail doesn't restrict the address family or if address belongs 3533 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3534 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3535 */ 3536 int 3537 prison_if(struct ucred *cred, struct sockaddr *sa) 3538 { 3539 #ifdef INET 3540 struct sockaddr_in *sai; 3541 #endif 3542 #ifdef INET6 3543 struct sockaddr_in6 *sai6; 3544 #endif 3545 int error; 3546 3547 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3548 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3549 3550 #ifdef VIMAGE 3551 if (prison_owns_vnet(cred)) 3552 return (0); 3553 #endif 3554 3555 error = 0; 3556 switch (sa->sa_family) 3557 { 3558 #ifdef INET 3559 case AF_INET: 3560 sai = (struct sockaddr_in *)sa; 3561 error = prison_check_ip4(cred, &sai->sin_addr); 3562 break; 3563 #endif 3564 #ifdef INET6 3565 case AF_INET6: 3566 sai6 = (struct sockaddr_in6 *)sa; 3567 error = prison_check_ip6(cred, &sai6->sin6_addr); 3568 break; 3569 #endif 3570 default: 3571 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3572 error = EAFNOSUPPORT; 3573 } 3574 return (error); 3575 } 3576 3577 /* 3578 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3579 */ 3580 int 3581 prison_check(struct ucred *cred1, struct ucred *cred2) 3582 { 3583 3584 return ((cred1->cr_prison == cred2->cr_prison || 3585 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3586 } 3587 3588 /* 3589 * Return 1 if p2 is a child of p1, otherwise 0. 3590 */ 3591 int 3592 prison_ischild(struct prison *pr1, struct prison *pr2) 3593 { 3594 3595 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3596 if (pr1 == pr2) 3597 return (1); 3598 return (0); 3599 } 3600 3601 /* 3602 * Return 1 if the passed credential is in a jail, otherwise 0. 3603 */ 3604 int 3605 jailed(struct ucred *cred) 3606 { 3607 3608 return (cred->cr_prison != &prison0); 3609 } 3610 3611 /* 3612 * Return 1 if the passed credential is in a jail and that jail does not 3613 * have its own virtual network stack, otherwise 0. 3614 */ 3615 int 3616 jailed_without_vnet(struct ucred *cred) 3617 { 3618 3619 if (!jailed(cred)) 3620 return (0); 3621 #ifdef VIMAGE 3622 if (prison_owns_vnet(cred)) 3623 return (0); 3624 #endif 3625 3626 return (1); 3627 } 3628 3629 /* 3630 * Return the correct hostname (domainname, et al) for the passed credential. 3631 */ 3632 void 3633 getcredhostname(struct ucred *cred, char *buf, size_t size) 3634 { 3635 struct prison *pr; 3636 3637 /* 3638 * A NULL credential can be used to shortcut to the physical 3639 * system's hostname. 3640 */ 3641 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3642 mtx_lock(&pr->pr_mtx); 3643 strlcpy(buf, pr->pr_hostname, size); 3644 mtx_unlock(&pr->pr_mtx); 3645 } 3646 3647 void 3648 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3649 { 3650 3651 mtx_lock(&cred->cr_prison->pr_mtx); 3652 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3653 mtx_unlock(&cred->cr_prison->pr_mtx); 3654 } 3655 3656 void 3657 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3658 { 3659 3660 mtx_lock(&cred->cr_prison->pr_mtx); 3661 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3662 mtx_unlock(&cred->cr_prison->pr_mtx); 3663 } 3664 3665 void 3666 getcredhostid(struct ucred *cred, unsigned long *hostid) 3667 { 3668 3669 mtx_lock(&cred->cr_prison->pr_mtx); 3670 *hostid = cred->cr_prison->pr_hostid; 3671 mtx_unlock(&cred->cr_prison->pr_mtx); 3672 } 3673 3674 #ifdef VIMAGE 3675 /* 3676 * Determine whether the prison represented by cred owns 3677 * its vnet rather than having it inherited. 3678 * 3679 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3680 */ 3681 int 3682 prison_owns_vnet(struct ucred *cred) 3683 { 3684 3685 /* 3686 * vnets cannot be added/removed after jail creation, 3687 * so no need to lock here. 3688 */ 3689 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3690 } 3691 #endif 3692 3693 /* 3694 * Determine whether the subject represented by cred can "see" 3695 * status of a mount point. 3696 * Returns: 0 for permitted, ENOENT otherwise. 3697 * XXX: This function should be called cr_canseemount() and should be 3698 * placed in kern_prot.c. 3699 */ 3700 int 3701 prison_canseemount(struct ucred *cred, struct mount *mp) 3702 { 3703 struct prison *pr; 3704 struct statfs *sp; 3705 size_t len; 3706 3707 pr = cred->cr_prison; 3708 if (pr->pr_enforce_statfs == 0) 3709 return (0); 3710 if (pr->pr_root->v_mount == mp) 3711 return (0); 3712 if (pr->pr_enforce_statfs == 2) 3713 return (ENOENT); 3714 /* 3715 * If jail's chroot directory is set to "/" we should be able to see 3716 * all mount-points from inside a jail. 3717 * This is ugly check, but this is the only situation when jail's 3718 * directory ends with '/'. 3719 */ 3720 if (strcmp(pr->pr_path, "/") == 0) 3721 return (0); 3722 len = strlen(pr->pr_path); 3723 sp = &mp->mnt_stat; 3724 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3725 return (ENOENT); 3726 /* 3727 * Be sure that we don't have situation where jail's root directory 3728 * is "/some/path" and mount point is "/some/pathpath". 3729 */ 3730 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3731 return (ENOENT); 3732 return (0); 3733 } 3734 3735 void 3736 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3737 { 3738 char jpath[MAXPATHLEN]; 3739 struct prison *pr; 3740 size_t len; 3741 3742 pr = cred->cr_prison; 3743 if (pr->pr_enforce_statfs == 0) 3744 return; 3745 if (prison_canseemount(cred, mp) != 0) { 3746 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3747 strlcpy(sp->f_mntonname, "[restricted]", 3748 sizeof(sp->f_mntonname)); 3749 return; 3750 } 3751 if (pr->pr_root->v_mount == mp) { 3752 /* 3753 * Clear current buffer data, so we are sure nothing from 3754 * the valid path left there. 3755 */ 3756 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3757 *sp->f_mntonname = '/'; 3758 return; 3759 } 3760 /* 3761 * If jail's chroot directory is set to "/" we should be able to see 3762 * all mount-points from inside a jail. 3763 */ 3764 if (strcmp(pr->pr_path, "/") == 0) 3765 return; 3766 len = strlen(pr->pr_path); 3767 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3768 /* 3769 * Clear current buffer data, so we are sure nothing from 3770 * the valid path left there. 3771 */ 3772 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3773 if (*jpath == '\0') { 3774 /* Should never happen. */ 3775 *sp->f_mntonname = '/'; 3776 } else { 3777 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3778 } 3779 } 3780 3781 /* 3782 * Check with permission for a specific privilege is granted within jail. We 3783 * have a specific list of accepted privileges; the rest are denied. 3784 */ 3785 int 3786 prison_priv_check(struct ucred *cred, int priv) 3787 { 3788 3789 if (!jailed(cred)) 3790 return (0); 3791 3792 #ifdef VIMAGE 3793 /* 3794 * Privileges specific to prisons with a virtual network stack. 3795 * There might be a duplicate entry here in case the privilege 3796 * is only granted conditionally in the legacy jail case. 3797 */ 3798 switch (priv) { 3799 #ifdef notyet 3800 /* 3801 * NFS-specific privileges. 3802 */ 3803 case PRIV_NFS_DAEMON: 3804 case PRIV_NFS_LOCKD: 3805 #endif 3806 /* 3807 * Network stack privileges. 3808 */ 3809 case PRIV_NET_BRIDGE: 3810 case PRIV_NET_GRE: 3811 case PRIV_NET_BPF: 3812 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3813 case PRIV_NET_ROUTE: 3814 case PRIV_NET_TAP: 3815 case PRIV_NET_SETIFMTU: 3816 case PRIV_NET_SETIFFLAGS: 3817 case PRIV_NET_SETIFCAP: 3818 case PRIV_NET_SETIFDESCR: 3819 case PRIV_NET_SETIFNAME : 3820 case PRIV_NET_SETIFMETRIC: 3821 case PRIV_NET_SETIFPHYS: 3822 case PRIV_NET_SETIFMAC: 3823 case PRIV_NET_ADDMULTI: 3824 case PRIV_NET_DELMULTI: 3825 case PRIV_NET_HWIOCTL: 3826 case PRIV_NET_SETLLADDR: 3827 case PRIV_NET_ADDIFGROUP: 3828 case PRIV_NET_DELIFGROUP: 3829 case PRIV_NET_IFCREATE: 3830 case PRIV_NET_IFDESTROY: 3831 case PRIV_NET_ADDIFADDR: 3832 case PRIV_NET_DELIFADDR: 3833 case PRIV_NET_LAGG: 3834 case PRIV_NET_GIF: 3835 case PRIV_NET_SETIFVNET: 3836 case PRIV_NET_SETIFFIB: 3837 3838 /* 3839 * 802.11-related privileges. 3840 */ 3841 case PRIV_NET80211_GETKEY: 3842 #ifdef notyet 3843 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3844 #endif 3845 3846 #ifdef notyet 3847 /* 3848 * AppleTalk privileges. 3849 */ 3850 case PRIV_NETATALK_RESERVEDPORT: 3851 3852 /* 3853 * ATM privileges. 3854 */ 3855 case PRIV_NETATM_CFG: 3856 case PRIV_NETATM_ADD: 3857 case PRIV_NETATM_DEL: 3858 case PRIV_NETATM_SET: 3859 3860 /* 3861 * Bluetooth privileges. 3862 */ 3863 case PRIV_NETBLUETOOTH_RAW: 3864 #endif 3865 3866 /* 3867 * Netgraph and netgraph module privileges. 3868 */ 3869 case PRIV_NETGRAPH_CONTROL: 3870 #ifdef notyet 3871 case PRIV_NETGRAPH_TTY: 3872 #endif 3873 3874 /* 3875 * IPv4 and IPv6 privileges. 3876 */ 3877 case PRIV_NETINET_IPFW: 3878 case PRIV_NETINET_DIVERT: 3879 case PRIV_NETINET_PF: 3880 case PRIV_NETINET_DUMMYNET: 3881 case PRIV_NETINET_CARP: 3882 case PRIV_NETINET_MROUTE: 3883 case PRIV_NETINET_RAW: 3884 case PRIV_NETINET_ADDRCTRL6: 3885 case PRIV_NETINET_ND6: 3886 case PRIV_NETINET_SCOPE6: 3887 case PRIV_NETINET_ALIFETIME6: 3888 case PRIV_NETINET_IPSEC: 3889 case PRIV_NETINET_BINDANY: 3890 3891 #ifdef notyet 3892 /* 3893 * IPX/SPX privileges. 3894 */ 3895 case PRIV_NETIPX_RESERVEDPORT: 3896 case PRIV_NETIPX_RAW: 3897 3898 /* 3899 * NCP privileges. 3900 */ 3901 case PRIV_NETNCP: 3902 3903 /* 3904 * SMB privileges. 3905 */ 3906 case PRIV_NETSMB: 3907 #endif 3908 3909 /* 3910 * No default: or deny here. 3911 * In case of no permit fall through to next switch(). 3912 */ 3913 if (cred->cr_prison->pr_flags & PR_VNET) 3914 return (0); 3915 } 3916 #endif /* VIMAGE */ 3917 3918 switch (priv) { 3919 3920 /* 3921 * Allow ktrace privileges for root in jail. 3922 */ 3923 case PRIV_KTRACE: 3924 3925 #if 0 3926 /* 3927 * Allow jailed processes to configure audit identity and 3928 * submit audit records (login, etc). In the future we may 3929 * want to further refine the relationship between audit and 3930 * jail. 3931 */ 3932 case PRIV_AUDIT_GETAUDIT: 3933 case PRIV_AUDIT_SETAUDIT: 3934 case PRIV_AUDIT_SUBMIT: 3935 #endif 3936 3937 /* 3938 * Allow jailed processes to manipulate process UNIX 3939 * credentials in any way they see fit. 3940 */ 3941 case PRIV_CRED_SETUID: 3942 case PRIV_CRED_SETEUID: 3943 case PRIV_CRED_SETGID: 3944 case PRIV_CRED_SETEGID: 3945 case PRIV_CRED_SETGROUPS: 3946 case PRIV_CRED_SETREUID: 3947 case PRIV_CRED_SETREGID: 3948 case PRIV_CRED_SETRESUID: 3949 case PRIV_CRED_SETRESGID: 3950 3951 /* 3952 * Jail implements visibility constraints already, so allow 3953 * jailed root to override uid/gid-based constraints. 3954 */ 3955 case PRIV_SEEOTHERGIDS: 3956 case PRIV_SEEOTHERUIDS: 3957 3958 /* 3959 * Jail implements inter-process debugging limits already, so 3960 * allow jailed root various debugging privileges. 3961 */ 3962 case PRIV_DEBUG_DIFFCRED: 3963 case PRIV_DEBUG_SUGID: 3964 case PRIV_DEBUG_UNPRIV: 3965 3966 /* 3967 * Allow jail to set various resource limits and login 3968 * properties, and for now, exceed process resource limits. 3969 */ 3970 case PRIV_PROC_LIMIT: 3971 case PRIV_PROC_SETLOGIN: 3972 case PRIV_PROC_SETRLIMIT: 3973 3974 /* 3975 * System V and POSIX IPC privileges are granted in jail. 3976 */ 3977 case PRIV_IPC_READ: 3978 case PRIV_IPC_WRITE: 3979 case PRIV_IPC_ADMIN: 3980 case PRIV_IPC_MSGSIZE: 3981 case PRIV_MQ_ADMIN: 3982 3983 /* 3984 * Jail operations within a jail work on child jails. 3985 */ 3986 case PRIV_JAIL_ATTACH: 3987 case PRIV_JAIL_SET: 3988 case PRIV_JAIL_REMOVE: 3989 3990 /* 3991 * Jail implements its own inter-process limits, so allow 3992 * root processes in jail to change scheduling on other 3993 * processes in the same jail. Likewise for signalling. 3994 */ 3995 case PRIV_SCHED_DIFFCRED: 3996 case PRIV_SCHED_CPUSET: 3997 case PRIV_SIGNAL_DIFFCRED: 3998 case PRIV_SIGNAL_SUGID: 3999 4000 /* 4001 * Allow jailed processes to write to sysctls marked as jail 4002 * writable. 4003 */ 4004 case PRIV_SYSCTL_WRITEJAIL: 4005 4006 /* 4007 * Allow root in jail to manage a variety of quota 4008 * properties. These should likely be conditional on a 4009 * configuration option. 4010 */ 4011 case PRIV_VFS_GETQUOTA: 4012 case PRIV_VFS_SETQUOTA: 4013 4014 /* 4015 * Since Jail relies on chroot() to implement file system 4016 * protections, grant many VFS privileges to root in jail. 4017 * Be careful to exclude mount-related and NFS-related 4018 * privileges. 4019 */ 4020 case PRIV_VFS_READ: 4021 case PRIV_VFS_WRITE: 4022 case PRIV_VFS_ADMIN: 4023 case PRIV_VFS_EXEC: 4024 case PRIV_VFS_LOOKUP: 4025 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 4026 case PRIV_VFS_CHFLAGS_DEV: 4027 case PRIV_VFS_CHOWN: 4028 case PRIV_VFS_CHROOT: 4029 case PRIV_VFS_RETAINSUGID: 4030 case PRIV_VFS_FCHROOT: 4031 case PRIV_VFS_LINK: 4032 case PRIV_VFS_SETGID: 4033 case PRIV_VFS_STAT: 4034 case PRIV_VFS_STICKYFILE: 4035 4036 /* 4037 * As in the non-jail case, non-root users are expected to be 4038 * able to read kernel/phyiscal memory (provided /dev/[k]mem 4039 * exists in the jail and they have permission to access it). 4040 */ 4041 case PRIV_KMEM_READ: 4042 return (0); 4043 4044 /* 4045 * Depending on the global setting, allow privilege of 4046 * setting system flags. 4047 */ 4048 case PRIV_VFS_SYSFLAGS: 4049 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 4050 return (0); 4051 else 4052 return (EPERM); 4053 4054 /* 4055 * Depending on the global setting, allow privilege of 4056 * mounting/unmounting file systems. 4057 */ 4058 case PRIV_VFS_MOUNT: 4059 case PRIV_VFS_UNMOUNT: 4060 case PRIV_VFS_MOUNT_NONUSER: 4061 case PRIV_VFS_MOUNT_OWNER: 4062 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 4063 cred->cr_prison->pr_enforce_statfs < 2) 4064 return (0); 4065 else 4066 return (EPERM); 4067 4068 /* 4069 * Allow jailed root to bind reserved ports and reuse in-use 4070 * ports. 4071 */ 4072 case PRIV_NETINET_RESERVEDPORT: 4073 case PRIV_NETINET_REUSEPORT: 4074 return (0); 4075 4076 /* 4077 * Allow jailed root to set certain IPv4/6 (option) headers. 4078 */ 4079 case PRIV_NETINET_SETHDROPTS: 4080 return (0); 4081 4082 /* 4083 * Conditionally allow creating raw sockets in jail. 4084 */ 4085 case PRIV_NETINET_RAW: 4086 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 4087 return (0); 4088 else 4089 return (EPERM); 4090 4091 /* 4092 * Since jail implements its own visibility limits on netstat 4093 * sysctls, allow getcred. This allows identd to work in 4094 * jail. 4095 */ 4096 case PRIV_NETINET_GETCRED: 4097 return (0); 4098 4099 /* 4100 * Allow jailed root to set loginclass. 4101 */ 4102 case PRIV_PROC_SETLOGINCLASS: 4103 return (0); 4104 4105 default: 4106 /* 4107 * In all remaining cases, deny the privilege request. This 4108 * includes almost all network privileges, many system 4109 * configuration privileges. 4110 */ 4111 return (EPERM); 4112 } 4113 } 4114 4115 /* 4116 * Return the part of pr2's name that is relative to pr1, or the whole name 4117 * if it does not directly follow. 4118 */ 4119 4120 char * 4121 prison_name(struct prison *pr1, struct prison *pr2) 4122 { 4123 char *name; 4124 4125 /* Jails see themselves as "" (if they see themselves at all). */ 4126 if (pr1 == pr2) 4127 return ""; 4128 name = pr2->pr_name; 4129 if (prison_ischild(pr1, pr2)) { 4130 /* 4131 * pr1 isn't locked (and allprison_lock may not be either) 4132 * so its length can't be counted on. But the number of dots 4133 * can be counted on - and counted. 4134 */ 4135 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 4136 name = strchr(name, '.') + 1; 4137 } 4138 return (name); 4139 } 4140 4141 /* 4142 * Return the part of pr2's path that is relative to pr1, or the whole path 4143 * if it does not directly follow. 4144 */ 4145 static char * 4146 prison_path(struct prison *pr1, struct prison *pr2) 4147 { 4148 char *path1, *path2; 4149 int len1; 4150 4151 path1 = pr1->pr_path; 4152 path2 = pr2->pr_path; 4153 if (!strcmp(path1, "/")) 4154 return (path2); 4155 len1 = strlen(path1); 4156 if (strncmp(path1, path2, len1)) 4157 return (path2); 4158 if (path2[len1] == '\0') 4159 return "/"; 4160 if (path2[len1] == '/') 4161 return (path2 + len1); 4162 return (path2); 4163 } 4164 4165 4166 /* 4167 * Jail-related sysctls. 4168 */ 4169 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 4170 "Jails"); 4171 4172 static int 4173 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4174 { 4175 struct xprison *xp; 4176 struct prison *pr, *cpr; 4177 #ifdef INET 4178 struct in_addr *ip4 = NULL; 4179 int ip4s = 0; 4180 #endif 4181 #ifdef INET6 4182 struct in6_addr *ip6 = NULL; 4183 int ip6s = 0; 4184 #endif 4185 int descend, error; 4186 4187 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4188 pr = req->td->td_ucred->cr_prison; 4189 error = 0; 4190 sx_slock(&allprison_lock); 4191 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4192 #if defined(INET) || defined(INET6) 4193 again: 4194 #endif 4195 mtx_lock(&cpr->pr_mtx); 4196 #ifdef INET 4197 if (cpr->pr_ip4s > 0) { 4198 if (ip4s < cpr->pr_ip4s) { 4199 ip4s = cpr->pr_ip4s; 4200 mtx_unlock(&cpr->pr_mtx); 4201 ip4 = realloc(ip4, ip4s * 4202 sizeof(struct in_addr), M_TEMP, M_WAITOK); 4203 goto again; 4204 } 4205 bcopy(cpr->pr_ip4, ip4, 4206 cpr->pr_ip4s * sizeof(struct in_addr)); 4207 } 4208 #endif 4209 #ifdef INET6 4210 if (cpr->pr_ip6s > 0) { 4211 if (ip6s < cpr->pr_ip6s) { 4212 ip6s = cpr->pr_ip6s; 4213 mtx_unlock(&cpr->pr_mtx); 4214 ip6 = realloc(ip6, ip6s * 4215 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 4216 goto again; 4217 } 4218 bcopy(cpr->pr_ip6, ip6, 4219 cpr->pr_ip6s * sizeof(struct in6_addr)); 4220 } 4221 #endif 4222 if (cpr->pr_ref == 0) { 4223 mtx_unlock(&cpr->pr_mtx); 4224 continue; 4225 } 4226 bzero(xp, sizeof(*xp)); 4227 xp->pr_version = XPRISON_VERSION; 4228 xp->pr_id = cpr->pr_id; 4229 xp->pr_state = cpr->pr_uref > 0 4230 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4231 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4232 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4233 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4234 #ifdef INET 4235 xp->pr_ip4s = cpr->pr_ip4s; 4236 #endif 4237 #ifdef INET6 4238 xp->pr_ip6s = cpr->pr_ip6s; 4239 #endif 4240 mtx_unlock(&cpr->pr_mtx); 4241 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4242 if (error) 4243 break; 4244 #ifdef INET 4245 if (xp->pr_ip4s > 0) { 4246 error = SYSCTL_OUT(req, ip4, 4247 xp->pr_ip4s * sizeof(struct in_addr)); 4248 if (error) 4249 break; 4250 } 4251 #endif 4252 #ifdef INET6 4253 if (xp->pr_ip6s > 0) { 4254 error = SYSCTL_OUT(req, ip6, 4255 xp->pr_ip6s * sizeof(struct in6_addr)); 4256 if (error) 4257 break; 4258 } 4259 #endif 4260 } 4261 sx_sunlock(&allprison_lock); 4262 free(xp, M_TEMP); 4263 #ifdef INET 4264 free(ip4, M_TEMP); 4265 #endif 4266 #ifdef INET6 4267 free(ip6, M_TEMP); 4268 #endif 4269 return (error); 4270 } 4271 4272 SYSCTL_OID(_security_jail, OID_AUTO, list, 4273 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4274 sysctl_jail_list, "S", "List of active jails"); 4275 4276 static int 4277 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4278 { 4279 int error, injail; 4280 4281 injail = jailed(req->td->td_ucred); 4282 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4283 4284 return (error); 4285 } 4286 4287 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4288 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4289 sysctl_jail_jailed, "I", "Process in jail?"); 4290 4291 static int 4292 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4293 { 4294 int error, havevnet; 4295 #ifdef VIMAGE 4296 struct ucred *cred = req->td->td_ucred; 4297 4298 havevnet = jailed(cred) && prison_owns_vnet(cred); 4299 #else 4300 havevnet = 0; 4301 #endif 4302 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4303 4304 return (error); 4305 } 4306 4307 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4308 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4309 sysctl_jail_vnet, "I", "Jail owns VNET?"); 4310 4311 #if defined(INET) || defined(INET6) 4312 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4313 &jail_max_af_ips, 0, 4314 "Number of IP addresses a jail may have at most per address family (deprecated)"); 4315 #endif 4316 4317 /* 4318 * Default parameters for jail(2) compatibility. For historical reasons, 4319 * the sysctl names have varying similarity to the parameter names. Prisons 4320 * just see their own parameters, and can't change them. 4321 */ 4322 static int 4323 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4324 { 4325 struct prison *pr; 4326 int allow, error, i; 4327 4328 pr = req->td->td_ucred->cr_prison; 4329 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4330 4331 /* Get the current flag value, and convert it to a boolean. */ 4332 i = (allow & arg2) ? 1 : 0; 4333 if (arg1 != NULL) 4334 i = !i; 4335 error = sysctl_handle_int(oidp, &i, 0, req); 4336 if (error || !req->newptr) 4337 return (error); 4338 i = i ? arg2 : 0; 4339 if (arg1 != NULL) 4340 i ^= arg2; 4341 /* 4342 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4343 * for writing. 4344 */ 4345 mtx_lock(&prison0.pr_mtx); 4346 jail_default_allow = (jail_default_allow & ~arg2) | i; 4347 mtx_unlock(&prison0.pr_mtx); 4348 return (0); 4349 } 4350 4351 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4352 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4353 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4354 "Processes in jail can set their hostnames (deprecated)"); 4355 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4356 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4357 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4358 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 4359 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4360 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4361 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4362 "Processes in jail can use System V IPC primitives (deprecated)"); 4363 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4364 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4365 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4366 "Prison root can create raw sockets (deprecated)"); 4367 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4368 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4369 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4370 "Processes in jail can alter system file flags (deprecated)"); 4371 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4372 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4373 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4374 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 4375 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 4376 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4377 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 4378 "Processes in jail can mount the devfs file system (deprecated)"); 4379 SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed, 4380 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4381 NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I", 4382 "Processes in jail can mount the fdescfs file system (deprecated)"); 4383 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 4384 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4385 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 4386 "Processes in jail can mount the nullfs file system (deprecated)"); 4387 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 4388 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4389 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 4390 "Processes in jail can mount the procfs file system (deprecated)"); 4391 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linprocfs_allowed, 4392 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4393 NULL, PR_ALLOW_MOUNT_LINPROCFS, sysctl_jail_default_allow, "I", 4394 "Processes in jail can mount the linprocfs file system (deprecated)"); 4395 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linsysfs_allowed, 4396 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4397 NULL, PR_ALLOW_MOUNT_LINSYSFS, sysctl_jail_default_allow, "I", 4398 "Processes in jail can mount the linsysfs file system (deprecated)"); 4399 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed, 4400 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4401 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I", 4402 "Processes in jail can mount the tmpfs file system (deprecated)"); 4403 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 4404 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4405 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 4406 "Processes in jail can mount the zfs file system (deprecated)"); 4407 4408 static int 4409 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4410 { 4411 struct prison *pr; 4412 int level, error; 4413 4414 pr = req->td->td_ucred->cr_prison; 4415 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4416 error = sysctl_handle_int(oidp, &level, 0, req); 4417 if (error || !req->newptr) 4418 return (error); 4419 *(int *)arg1 = level; 4420 return (0); 4421 } 4422 4423 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4424 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4425 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4426 sysctl_jail_default_level, "I", 4427 "Processes in jail cannot see all mounted file systems (deprecated)"); 4428 4429 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4430 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4431 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4432 sysctl_jail_default_level, "I", 4433 "Ruleset for the devfs filesystem in jail (deprecated)"); 4434 4435 /* 4436 * Nodes to describe jail parameters. Maximum length of string parameters 4437 * is returned in the string itself, and the other parameters exist merely 4438 * to make themselves and their types known. 4439 */ 4440 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4441 "Jail parameters"); 4442 4443 int 4444 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4445 { 4446 int i; 4447 long l; 4448 size_t s; 4449 char numbuf[12]; 4450 4451 switch (oidp->oid_kind & CTLTYPE) 4452 { 4453 case CTLTYPE_LONG: 4454 case CTLTYPE_ULONG: 4455 l = 0; 4456 #ifdef SCTL_MASK32 4457 if (!(req->flags & SCTL_MASK32)) 4458 #endif 4459 return (SYSCTL_OUT(req, &l, sizeof(l))); 4460 case CTLTYPE_INT: 4461 case CTLTYPE_UINT: 4462 i = 0; 4463 return (SYSCTL_OUT(req, &i, sizeof(i))); 4464 case CTLTYPE_STRING: 4465 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4466 return 4467 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4468 case CTLTYPE_STRUCT: 4469 s = (size_t)arg2; 4470 return (SYSCTL_OUT(req, &s, sizeof(s))); 4471 } 4472 return (0); 4473 } 4474 4475 /* 4476 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 4477 * jail creation time but cannot be changed in an existing jail. 4478 */ 4479 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4480 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4481 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4482 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4483 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4484 "I", "Jail secure level"); 4485 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 4486 "Jail value for kern.osreldate and uname -K"); 4487 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 4488 "Jail value for kern.osrelease and uname -r"); 4489 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4490 "I", "Jail cannot see all mounted file systems"); 4491 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4492 "I", "Ruleset for in-jail devfs mounts"); 4493 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4494 "B", "Jail persistence"); 4495 #ifdef VIMAGE 4496 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4497 "E,jailsys", "Virtual network stack"); 4498 #endif 4499 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4500 "B", "Jail is in the process of shutting down"); 4501 4502 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4503 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4504 "I", "Current number of child jails"); 4505 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4506 "I", "Maximum number of child jails"); 4507 4508 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4509 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4510 "Jail hostname"); 4511 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4512 "Jail NIS domainname"); 4513 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4514 "Jail host UUID"); 4515 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4516 "LU", "Jail host ID"); 4517 4518 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4519 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4520 4521 #ifdef INET 4522 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4523 "Jail IPv4 address virtualization"); 4524 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4525 "S,in_addr,a", "Jail IPv4 addresses"); 4526 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4527 "B", "Do (not) use IPv4 source address selection rather than the " 4528 "primary jail IPv4 address."); 4529 #endif 4530 #ifdef INET6 4531 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4532 "Jail IPv6 address virtualization"); 4533 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4534 "S,in6_addr,a", "Jail IPv6 addresses"); 4535 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4536 "B", "Do (not) use IPv6 source address selection rather than the " 4537 "primary jail IPv6 address."); 4538 #endif 4539 4540 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4541 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4542 "B", "Jail may set hostname"); 4543 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4544 "B", "Jail may use SYSV IPC"); 4545 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4546 "B", "Jail may create raw sockets"); 4547 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4548 "B", "Jail may alter system file flags"); 4549 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4550 "B", "Jail may set file quotas"); 4551 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4552 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4553 4554 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4555 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4556 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4557 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 4558 "B", "Jail may mount the devfs file system"); 4559 SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW, 4560 "B", "Jail may mount the fdescfs file system"); 4561 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 4562 "B", "Jail may mount the nullfs file system"); 4563 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 4564 "B", "Jail may mount the procfs file system"); 4565 SYSCTL_JAIL_PARAM(_allow_mount, linprocfs, CTLTYPE_INT | CTLFLAG_RW, 4566 "B", "Jail may mount the linprocfs file system"); 4567 SYSCTL_JAIL_PARAM(_allow_mount, linsysfs, CTLTYPE_INT | CTLFLAG_RW, 4568 "B", "Jail may mount the linsysfs file system"); 4569 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW, 4570 "B", "Jail may mount the tmpfs file system"); 4571 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 4572 "B", "Jail may mount the zfs file system"); 4573 4574 #ifdef RACCT 4575 void 4576 prison_racct_foreach(void (*callback)(struct racct *racct, 4577 void *arg2, void *arg3), void *arg2, void *arg3) 4578 { 4579 struct prison_racct *prr; 4580 4581 ASSERT_RACCT_ENABLED(); 4582 4583 sx_slock(&allprison_lock); 4584 LIST_FOREACH(prr, &allprison_racct, prr_next) 4585 (callback)(prr->prr_racct, arg2, arg3); 4586 sx_sunlock(&allprison_lock); 4587 } 4588 4589 static struct prison_racct * 4590 prison_racct_find_locked(const char *name) 4591 { 4592 struct prison_racct *prr; 4593 4594 ASSERT_RACCT_ENABLED(); 4595 sx_assert(&allprison_lock, SA_XLOCKED); 4596 4597 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4598 return (NULL); 4599 4600 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4601 if (strcmp(name, prr->prr_name) != 0) 4602 continue; 4603 4604 /* Found prison_racct with a matching name? */ 4605 prison_racct_hold(prr); 4606 return (prr); 4607 } 4608 4609 /* Add new prison_racct. */ 4610 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4611 racct_create(&prr->prr_racct); 4612 4613 strcpy(prr->prr_name, name); 4614 refcount_init(&prr->prr_refcount, 1); 4615 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4616 4617 return (prr); 4618 } 4619 4620 struct prison_racct * 4621 prison_racct_find(const char *name) 4622 { 4623 struct prison_racct *prr; 4624 4625 ASSERT_RACCT_ENABLED(); 4626 4627 sx_xlock(&allprison_lock); 4628 prr = prison_racct_find_locked(name); 4629 sx_xunlock(&allprison_lock); 4630 return (prr); 4631 } 4632 4633 void 4634 prison_racct_hold(struct prison_racct *prr) 4635 { 4636 4637 ASSERT_RACCT_ENABLED(); 4638 4639 refcount_acquire(&prr->prr_refcount); 4640 } 4641 4642 static void 4643 prison_racct_free_locked(struct prison_racct *prr) 4644 { 4645 4646 ASSERT_RACCT_ENABLED(); 4647 sx_assert(&allprison_lock, SA_XLOCKED); 4648 4649 if (refcount_release(&prr->prr_refcount)) { 4650 racct_destroy(&prr->prr_racct); 4651 LIST_REMOVE(prr, prr_next); 4652 free(prr, M_PRISON_RACCT); 4653 } 4654 } 4655 4656 void 4657 prison_racct_free(struct prison_racct *prr) 4658 { 4659 int old; 4660 4661 ASSERT_RACCT_ENABLED(); 4662 sx_assert(&allprison_lock, SA_UNLOCKED); 4663 4664 old = prr->prr_refcount; 4665 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4666 return; 4667 4668 sx_xlock(&allprison_lock); 4669 prison_racct_free_locked(prr); 4670 sx_xunlock(&allprison_lock); 4671 } 4672 4673 static void 4674 prison_racct_attach(struct prison *pr) 4675 { 4676 struct prison_racct *prr; 4677 4678 ASSERT_RACCT_ENABLED(); 4679 sx_assert(&allprison_lock, SA_XLOCKED); 4680 4681 prr = prison_racct_find_locked(pr->pr_name); 4682 KASSERT(prr != NULL, ("cannot find prison_racct")); 4683 4684 pr->pr_prison_racct = prr; 4685 } 4686 4687 /* 4688 * Handle jail renaming. From the racct point of view, renaming means 4689 * moving from one prison_racct to another. 4690 */ 4691 static void 4692 prison_racct_modify(struct prison *pr) 4693 { 4694 struct proc *p; 4695 struct ucred *cred; 4696 struct prison_racct *oldprr; 4697 4698 ASSERT_RACCT_ENABLED(); 4699 4700 sx_slock(&allproc_lock); 4701 sx_xlock(&allprison_lock); 4702 4703 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4704 sx_xunlock(&allprison_lock); 4705 sx_sunlock(&allproc_lock); 4706 return; 4707 } 4708 4709 oldprr = pr->pr_prison_racct; 4710 pr->pr_prison_racct = NULL; 4711 4712 prison_racct_attach(pr); 4713 4714 /* 4715 * Move resource utilisation records. 4716 */ 4717 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4718 4719 /* 4720 * Force rctl to reattach rules to processes. 4721 */ 4722 FOREACH_PROC_IN_SYSTEM(p) { 4723 PROC_LOCK(p); 4724 cred = crhold(p->p_ucred); 4725 PROC_UNLOCK(p); 4726 racct_proc_ucred_changed(p, cred, cred); 4727 crfree(cred); 4728 } 4729 4730 sx_sunlock(&allproc_lock); 4731 prison_racct_free_locked(oldprr); 4732 sx_xunlock(&allprison_lock); 4733 } 4734 4735 static void 4736 prison_racct_detach(struct prison *pr) 4737 { 4738 4739 ASSERT_RACCT_ENABLED(); 4740 sx_assert(&allprison_lock, SA_UNLOCKED); 4741 4742 if (pr->pr_prison_racct == NULL) 4743 return; 4744 prison_racct_free(pr->pr_prison_racct); 4745 pr->pr_prison_racct = NULL; 4746 } 4747 #endif /* RACCT */ 4748 4749 #ifdef DDB 4750 4751 static void 4752 db_show_prison(struct prison *pr) 4753 { 4754 int fi; 4755 #if defined(INET) || defined(INET6) 4756 int ii; 4757 #endif 4758 unsigned jsf; 4759 #ifdef INET6 4760 char ip6buf[INET6_ADDRSTRLEN]; 4761 #endif 4762 4763 db_printf("prison %p:\n", pr); 4764 db_printf(" jid = %d\n", pr->pr_id); 4765 db_printf(" name = %s\n", pr->pr_name); 4766 db_printf(" parent = %p\n", pr->pr_parent); 4767 db_printf(" ref = %d\n", pr->pr_ref); 4768 db_printf(" uref = %d\n", pr->pr_uref); 4769 db_printf(" path = %s\n", pr->pr_path); 4770 db_printf(" cpuset = %d\n", pr->pr_cpuset 4771 ? pr->pr_cpuset->cs_id : -1); 4772 #ifdef VIMAGE 4773 db_printf(" vnet = %p\n", pr->pr_vnet); 4774 #endif 4775 db_printf(" root = %p\n", pr->pr_root); 4776 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4777 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4778 db_printf(" children.max = %d\n", pr->pr_childmax); 4779 db_printf(" children.cur = %d\n", pr->pr_childcount); 4780 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4781 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4782 db_printf(" flags = 0x%x", pr->pr_flags); 4783 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4784 fi++) 4785 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4786 db_printf(" %s", pr_flag_names[fi]); 4787 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4788 fi++) { 4789 jsf = pr->pr_flags & 4790 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4791 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4792 pr_flag_jailsys[fi].disable && 4793 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4794 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4795 : "inherit"); 4796 } 4797 db_printf(" allow = 0x%x", pr->pr_allow); 4798 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4799 fi++) 4800 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4801 db_printf(" %s", pr_allow_names[fi]); 4802 db_printf("\n"); 4803 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4804 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4805 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4806 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4807 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4808 #ifdef INET 4809 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4810 for (ii = 0; ii < pr->pr_ip4s; ii++) 4811 db_printf(" %s %s\n", 4812 ii == 0 ? "ip4.addr =" : " ", 4813 inet_ntoa(pr->pr_ip4[ii])); 4814 #endif 4815 #ifdef INET6 4816 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4817 for (ii = 0; ii < pr->pr_ip6s; ii++) 4818 db_printf(" %s %s\n", 4819 ii == 0 ? "ip6.addr =" : " ", 4820 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4821 #endif 4822 } 4823 4824 DB_SHOW_COMMAND(prison, db_show_prison_command) 4825 { 4826 struct prison *pr; 4827 4828 if (!have_addr) { 4829 /* 4830 * Show all prisons in the list, and prison0 which is not 4831 * listed. 4832 */ 4833 db_show_prison(&prison0); 4834 if (!db_pager_quit) { 4835 TAILQ_FOREACH(pr, &allprison, pr_list) { 4836 db_show_prison(pr); 4837 if (db_pager_quit) 4838 break; 4839 } 4840 } 4841 return; 4842 } 4843 4844 if (addr == 0) 4845 pr = &prison0; 4846 else { 4847 /* Look for a prison with the ID and with references. */ 4848 TAILQ_FOREACH(pr, &allprison, pr_list) 4849 if (pr->pr_id == addr && pr->pr_ref > 0) 4850 break; 4851 if (pr == NULL) 4852 /* Look again, without requiring a reference. */ 4853 TAILQ_FOREACH(pr, &allprison, pr_list) 4854 if (pr->pr_id == addr) 4855 break; 4856 if (pr == NULL) 4857 /* Assume address points to a valid prison. */ 4858 pr = (struct prison *)addr; 4859 } 4860 db_show_prison(pr); 4861 } 4862 4863 #endif /* DDB */
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