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