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 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1332 1333 #ifdef VIMAGE 1334 /* Allocate a new vnet if specified. */ 1335 pr->pr_vnet = (pr_flags & PR_VNET) 1336 ? vnet_alloc() : ppr->pr_vnet; 1337 #endif 1338 /* 1339 * Allocate a dedicated cpuset for each jail. 1340 * Unlike other initial settings, this may return an erorr. 1341 */ 1342 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1343 if (error) { 1344 prison_deref(pr, PD_LIST_XLOCKED); 1345 goto done_releroot; 1346 } 1347 1348 mtx_lock(&pr->pr_mtx); 1349 /* 1350 * New prisons do not yet have a reference, because we do not 1351 * want others to see the incomplete prison once the 1352 * allprison_lock is downgraded. 1353 */ 1354 } else { 1355 created = 0; 1356 /* 1357 * Grab a reference for existing prisons, to ensure they 1358 * continue to exist for the duration of the call. 1359 */ 1360 pr->pr_ref++; 1361 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1362 if ((pr->pr_flags & PR_VNET) && 1363 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1364 error = EINVAL; 1365 vfs_opterror(opts, 1366 "vnet jails cannot have IP address restrictions"); 1367 goto done_deref_locked; 1368 } 1369 #endif 1370 #ifdef INET 1371 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1372 error = EINVAL; 1373 vfs_opterror(opts, 1374 "ip4 cannot be changed after creation"); 1375 goto done_deref_locked; 1376 } 1377 #endif 1378 #ifdef INET6 1379 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1380 error = EINVAL; 1381 vfs_opterror(opts, 1382 "ip6 cannot be changed after creation"); 1383 goto done_deref_locked; 1384 } 1385 #endif 1386 } 1387 1388 /* Do final error checking before setting anything. */ 1389 if (gotslevel) { 1390 if (slevel < ppr->pr_securelevel) { 1391 error = EPERM; 1392 goto done_deref_locked; 1393 } 1394 } 1395 if (gotchildmax) { 1396 if (childmax >= ppr->pr_childmax) { 1397 error = EPERM; 1398 goto done_deref_locked; 1399 } 1400 } 1401 if (gotenforce) { 1402 if (enforce < ppr->pr_enforce_statfs) { 1403 error = EPERM; 1404 goto done_deref_locked; 1405 } 1406 } 1407 if (gotrsnum) { 1408 /* 1409 * devfs_rsnum is a uint16_t 1410 */ 1411 if (rsnum < 0 || rsnum > 65535) { 1412 error = EINVAL; 1413 goto done_deref_locked; 1414 } 1415 /* 1416 * Nested jails always inherit parent's devfs ruleset 1417 */ 1418 if (jailed(td->td_ucred)) { 1419 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1420 error = EPERM; 1421 goto done_deref_locked; 1422 } else 1423 rsnum = ppr->pr_devfs_rsnum; 1424 } 1425 } 1426 #ifdef INET 1427 if (ip4s > 0) { 1428 if (ppr->pr_flags & PR_IP4) { 1429 /* 1430 * Make sure the new set of IP addresses is a 1431 * subset of the parent's list. Don't worry 1432 * about the parent being unlocked, as any 1433 * setting is done with allprison_lock held. 1434 */ 1435 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1436 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1437 break; 1438 if (ij == ppr->pr_ip4s) { 1439 error = EPERM; 1440 goto done_deref_locked; 1441 } 1442 if (ip4s > 1) { 1443 for (ii = ij = 1; ii < ip4s; ii++) { 1444 if (ip4[ii].s_addr == 1445 ppr->pr_ip4[0].s_addr) 1446 continue; 1447 for (; ij < ppr->pr_ip4s; ij++) 1448 if (ip4[ii].s_addr == 1449 ppr->pr_ip4[ij].s_addr) 1450 break; 1451 if (ij == ppr->pr_ip4s) 1452 break; 1453 } 1454 if (ij == ppr->pr_ip4s) { 1455 error = EPERM; 1456 goto done_deref_locked; 1457 } 1458 } 1459 } 1460 /* 1461 * Check for conflicting IP addresses. We permit them 1462 * if there is no more than one IP on each jail. If 1463 * there is a duplicate on a jail with more than one 1464 * IP stop checking and return error. 1465 */ 1466 tppr = ppr; 1467 #ifdef VIMAGE 1468 for (; tppr != &prison0; tppr = tppr->pr_parent) 1469 if (tppr->pr_flags & PR_VNET) 1470 break; 1471 #endif 1472 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1473 if (tpr == pr || 1474 #ifdef VIMAGE 1475 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1476 #endif 1477 tpr->pr_uref == 0) { 1478 descend = 0; 1479 continue; 1480 } 1481 if (!(tpr->pr_flags & PR_IP4_USER)) 1482 continue; 1483 descend = 0; 1484 if (tpr->pr_ip4 == NULL || 1485 (ip4s == 1 && tpr->pr_ip4s == 1)) 1486 continue; 1487 for (ii = 0; ii < ip4s; ii++) { 1488 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1489 error = EADDRINUSE; 1490 vfs_opterror(opts, 1491 "IPv4 addresses clash"); 1492 goto done_deref_locked; 1493 } 1494 } 1495 } 1496 } 1497 #endif 1498 #ifdef INET6 1499 if (ip6s > 0) { 1500 if (ppr->pr_flags & PR_IP6) { 1501 /* 1502 * Make sure the new set of IP addresses is a 1503 * subset of the parent's list. 1504 */ 1505 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1506 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1507 &ppr->pr_ip6[ij])) 1508 break; 1509 if (ij == ppr->pr_ip6s) { 1510 error = EPERM; 1511 goto done_deref_locked; 1512 } 1513 if (ip6s > 1) { 1514 for (ii = ij = 1; ii < ip6s; ii++) { 1515 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1516 &ppr->pr_ip6[0])) 1517 continue; 1518 for (; ij < ppr->pr_ip6s; ij++) 1519 if (IN6_ARE_ADDR_EQUAL( 1520 &ip6[ii], &ppr->pr_ip6[ij])) 1521 break; 1522 if (ij == ppr->pr_ip6s) 1523 break; 1524 } 1525 if (ij == ppr->pr_ip6s) { 1526 error = EPERM; 1527 goto done_deref_locked; 1528 } 1529 } 1530 } 1531 /* Check for conflicting IP addresses. */ 1532 tppr = ppr; 1533 #ifdef VIMAGE 1534 for (; tppr != &prison0; tppr = tppr->pr_parent) 1535 if (tppr->pr_flags & PR_VNET) 1536 break; 1537 #endif 1538 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1539 if (tpr == pr || 1540 #ifdef VIMAGE 1541 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1542 #endif 1543 tpr->pr_uref == 0) { 1544 descend = 0; 1545 continue; 1546 } 1547 if (!(tpr->pr_flags & PR_IP6_USER)) 1548 continue; 1549 descend = 0; 1550 if (tpr->pr_ip6 == NULL || 1551 (ip6s == 1 && tpr->pr_ip6s == 1)) 1552 continue; 1553 for (ii = 0; ii < ip6s; ii++) { 1554 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1555 error = EADDRINUSE; 1556 vfs_opterror(opts, 1557 "IPv6 addresses clash"); 1558 goto done_deref_locked; 1559 } 1560 } 1561 } 1562 } 1563 #endif 1564 onamelen = namelen = 0; 1565 if (namelc != NULL) { 1566 /* Give a default name of the jid. Also allow the name to be 1567 * explicitly the jid - but not any other number, and only in 1568 * normal form (no leading zero/etc). 1569 */ 1570 if (namelc[0] == '\0') 1571 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1572 else if ((strtoul(namelc, &p, 10) != jid || 1573 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1574 error = EINVAL; 1575 vfs_opterror(opts, 1576 "name cannot be numeric (unless it is the jid)"); 1577 goto done_deref_locked; 1578 } 1579 /* 1580 * Make sure the name isn't too long for the prison or its 1581 * children. 1582 */ 1583 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1584 onamelen = strlen(pr->pr_name + pnamelen); 1585 namelen = strlen(namelc); 1586 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1587 error = ENAMETOOLONG; 1588 goto done_deref_locked; 1589 } 1590 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1591 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1592 sizeof(pr->pr_name)) { 1593 error = ENAMETOOLONG; 1594 goto done_deref_locked; 1595 } 1596 } 1597 } 1598 if (pr_allow & ~ppr->pr_allow) { 1599 error = EPERM; 1600 goto done_deref_locked; 1601 } 1602 1603 /* 1604 * Let modules check their parameters. This requires unlocking and 1605 * then re-locking the prison, but this is still a valid state as long 1606 * as allprison_lock remains xlocked. 1607 */ 1608 mtx_unlock(&pr->pr_mtx); 1609 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1610 if (error != 0) { 1611 prison_deref(pr, created 1612 ? PD_LIST_XLOCKED 1613 : PD_DEREF | PD_LIST_XLOCKED); 1614 goto done_releroot; 1615 } 1616 mtx_lock(&pr->pr_mtx); 1617 1618 /* At this point, all valid parameters should have been noted. */ 1619 TAILQ_FOREACH(opt, opts, link) { 1620 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1621 error = EINVAL; 1622 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1623 goto done_deref_locked; 1624 } 1625 } 1626 1627 /* Set the parameters of the prison. */ 1628 #ifdef INET 1629 redo_ip4 = 0; 1630 if (pr_flags & PR_IP4_USER) { 1631 pr->pr_flags |= PR_IP4; 1632 free(pr->pr_ip4, M_PRISON); 1633 pr->pr_ip4s = ip4s; 1634 pr->pr_ip4 = ip4; 1635 ip4 = NULL; 1636 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1637 #ifdef VIMAGE 1638 if (tpr->pr_flags & PR_VNET) { 1639 descend = 0; 1640 continue; 1641 } 1642 #endif 1643 if (prison_restrict_ip4(tpr, NULL)) { 1644 redo_ip4 = 1; 1645 descend = 0; 1646 } 1647 } 1648 } 1649 #endif 1650 #ifdef INET6 1651 redo_ip6 = 0; 1652 if (pr_flags & PR_IP6_USER) { 1653 pr->pr_flags |= PR_IP6; 1654 free(pr->pr_ip6, M_PRISON); 1655 pr->pr_ip6s = ip6s; 1656 pr->pr_ip6 = ip6; 1657 ip6 = NULL; 1658 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1659 #ifdef VIMAGE 1660 if (tpr->pr_flags & PR_VNET) { 1661 descend = 0; 1662 continue; 1663 } 1664 #endif 1665 if (prison_restrict_ip6(tpr, NULL)) { 1666 redo_ip6 = 1; 1667 descend = 0; 1668 } 1669 } 1670 } 1671 #endif 1672 if (gotslevel) { 1673 pr->pr_securelevel = slevel; 1674 /* Set all child jails to be at least this level. */ 1675 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1676 if (tpr->pr_securelevel < slevel) 1677 tpr->pr_securelevel = slevel; 1678 } 1679 if (gotchildmax) { 1680 pr->pr_childmax = childmax; 1681 /* Set all child jails to under this limit. */ 1682 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1683 if (tpr->pr_childmax > childmax - level) 1684 tpr->pr_childmax = childmax > level 1685 ? childmax - level : 0; 1686 } 1687 if (gotenforce) { 1688 pr->pr_enforce_statfs = enforce; 1689 /* Pass this restriction on to the children. */ 1690 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1691 if (tpr->pr_enforce_statfs < enforce) 1692 tpr->pr_enforce_statfs = enforce; 1693 } 1694 if (gotrsnum) { 1695 pr->pr_devfs_rsnum = rsnum; 1696 /* Pass this restriction on to the children. */ 1697 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1698 tpr->pr_devfs_rsnum = rsnum; 1699 } 1700 if (namelc != NULL) { 1701 if (ppr == &prison0) 1702 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1703 else 1704 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1705 ppr->pr_name, namelc); 1706 /* Change this component of child names. */ 1707 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1708 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1709 strlen(tpr->pr_name + onamelen) + 1); 1710 bcopy(pr->pr_name, tpr->pr_name, namelen); 1711 } 1712 } 1713 if (path != NULL) { 1714 /* Try to keep a real-rooted full pathname. */ 1715 if (fullpath_disabled && path[0] == '/' && 1716 strcmp(mypr->pr_path, "/")) 1717 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1718 mypr->pr_path, path); 1719 else 1720 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1721 pr->pr_root = root; 1722 } 1723 if (PR_HOST & ch_flags & ~pr_flags) { 1724 if (pr->pr_flags & PR_HOST) { 1725 /* 1726 * Copy the parent's host info. As with pr_ip4 above, 1727 * the lack of a lock on the parent is not a problem; 1728 * it is always set with allprison_lock at least 1729 * shared, and is held exclusively here. 1730 */ 1731 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1732 sizeof(pr->pr_hostname)); 1733 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1734 sizeof(pr->pr_domainname)); 1735 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1736 sizeof(pr->pr_hostuuid)); 1737 pr->pr_hostid = pr->pr_parent->pr_hostid; 1738 } 1739 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1740 /* Set this prison, and any descendants without PR_HOST. */ 1741 if (host != NULL) 1742 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1743 if (domain != NULL) 1744 strlcpy(pr->pr_domainname, domain, 1745 sizeof(pr->pr_domainname)); 1746 if (uuid != NULL) 1747 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1748 if (gothid) 1749 pr->pr_hostid = hid; 1750 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1751 if (tpr->pr_flags & PR_HOST) 1752 descend = 0; 1753 else { 1754 if (host != NULL) 1755 strlcpy(tpr->pr_hostname, 1756 pr->pr_hostname, 1757 sizeof(tpr->pr_hostname)); 1758 if (domain != NULL) 1759 strlcpy(tpr->pr_domainname, 1760 pr->pr_domainname, 1761 sizeof(tpr->pr_domainname)); 1762 if (uuid != NULL) 1763 strlcpy(tpr->pr_hostuuid, 1764 pr->pr_hostuuid, 1765 sizeof(tpr->pr_hostuuid)); 1766 if (gothid) 1767 tpr->pr_hostid = hid; 1768 } 1769 } 1770 } 1771 if ((tallow = ch_allow & ~pr_allow)) { 1772 /* Clear allow bits in all children. */ 1773 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1774 tpr->pr_allow &= ~tallow; 1775 } 1776 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1777 /* 1778 * Persistent prisons get an extra reference, and prisons losing their 1779 * persist flag lose that reference. Only do this for existing prisons 1780 * for now, so new ones will remain unseen until after the module 1781 * handlers have completed. 1782 */ 1783 born = pr->pr_uref == 0; 1784 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1785 if (pr_flags & PR_PERSIST) { 1786 pr->pr_ref++; 1787 pr->pr_uref++; 1788 } else { 1789 pr->pr_ref--; 1790 pr->pr_uref--; 1791 } 1792 } 1793 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1794 mtx_unlock(&pr->pr_mtx); 1795 1796 #ifdef RACCT 1797 if (racct_enable && created) 1798 prison_racct_attach(pr); 1799 #endif 1800 1801 /* Locks may have prevented a complete restriction of child IP 1802 * addresses. If so, allocate some more memory and try again. 1803 */ 1804 #ifdef INET 1805 while (redo_ip4) { 1806 ip4s = pr->pr_ip4s; 1807 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1808 mtx_lock(&pr->pr_mtx); 1809 redo_ip4 = 0; 1810 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1811 #ifdef VIMAGE 1812 if (tpr->pr_flags & PR_VNET) { 1813 descend = 0; 1814 continue; 1815 } 1816 #endif 1817 if (prison_restrict_ip4(tpr, ip4)) { 1818 if (ip4 != NULL) 1819 ip4 = NULL; 1820 else 1821 redo_ip4 = 1; 1822 } 1823 } 1824 mtx_unlock(&pr->pr_mtx); 1825 } 1826 #endif 1827 #ifdef INET6 1828 while (redo_ip6) { 1829 ip6s = pr->pr_ip6s; 1830 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1831 mtx_lock(&pr->pr_mtx); 1832 redo_ip6 = 0; 1833 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1834 #ifdef VIMAGE 1835 if (tpr->pr_flags & PR_VNET) { 1836 descend = 0; 1837 continue; 1838 } 1839 #endif 1840 if (prison_restrict_ip6(tpr, ip6)) { 1841 if (ip6 != NULL) 1842 ip6 = NULL; 1843 else 1844 redo_ip6 = 1; 1845 } 1846 } 1847 mtx_unlock(&pr->pr_mtx); 1848 } 1849 #endif 1850 1851 /* Let the modules do their work. */ 1852 sx_downgrade(&allprison_lock); 1853 if (born) { 1854 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1855 if (error) { 1856 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1857 prison_deref(pr, created 1858 ? PD_LIST_SLOCKED 1859 : PD_DEREF | PD_LIST_SLOCKED); 1860 goto done_errmsg; 1861 } 1862 } 1863 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1864 if (error) { 1865 if (born) 1866 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1867 prison_deref(pr, created 1868 ? PD_LIST_SLOCKED 1869 : PD_DEREF | PD_LIST_SLOCKED); 1870 goto done_errmsg; 1871 } 1872 1873 /* Attach this process to the prison if requested. */ 1874 if (flags & JAIL_ATTACH) { 1875 mtx_lock(&pr->pr_mtx); 1876 error = do_jail_attach(td, pr); 1877 if (error) { 1878 vfs_opterror(opts, "attach failed"); 1879 if (!created) 1880 prison_deref(pr, PD_DEREF); 1881 goto done_errmsg; 1882 } 1883 } 1884 1885 #ifdef RACCT 1886 if (racct_enable && !created) { 1887 if (!(flags & JAIL_ATTACH)) 1888 sx_sunlock(&allprison_lock); 1889 prison_racct_modify(pr); 1890 if (!(flags & JAIL_ATTACH)) 1891 sx_slock(&allprison_lock); 1892 } 1893 #endif 1894 1895 td->td_retval[0] = pr->pr_id; 1896 1897 /* 1898 * Now that it is all there, drop the temporary reference from existing 1899 * prisons. Or add a reference to newly created persistent prisons 1900 * (which was not done earlier so that the prison would not be publicly 1901 * visible). 1902 */ 1903 if (!created) { 1904 prison_deref(pr, (flags & JAIL_ATTACH) 1905 ? PD_DEREF 1906 : PD_DEREF | PD_LIST_SLOCKED); 1907 } else { 1908 if (pr_flags & PR_PERSIST) { 1909 mtx_lock(&pr->pr_mtx); 1910 pr->pr_ref++; 1911 pr->pr_uref++; 1912 mtx_unlock(&pr->pr_mtx); 1913 } 1914 if (!(flags & JAIL_ATTACH)) 1915 sx_sunlock(&allprison_lock); 1916 } 1917 1918 goto done_free; 1919 1920 done_deref_locked: 1921 prison_deref(pr, created 1922 ? PD_LOCKED | PD_LIST_XLOCKED 1923 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1924 goto done_releroot; 1925 done_unlock_list: 1926 sx_xunlock(&allprison_lock); 1927 done_releroot: 1928 if (root != NULL) 1929 vrele(root); 1930 done_errmsg: 1931 if (error) { 1932 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1933 if (errmsg_len > 0) { 1934 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1935 if (errmsg_pos > 0) { 1936 if (optuio->uio_segflg == UIO_SYSSPACE) 1937 bcopy(errmsg, 1938 optuio->uio_iov[errmsg_pos].iov_base, 1939 errmsg_len); 1940 else 1941 copyout(errmsg, 1942 optuio->uio_iov[errmsg_pos].iov_base, 1943 errmsg_len); 1944 } 1945 } 1946 } 1947 done_free: 1948 #ifdef INET 1949 free(ip4, M_PRISON); 1950 #endif 1951 #ifdef INET6 1952 free(ip6, M_PRISON); 1953 #endif 1954 if (g_path != NULL) 1955 free(g_path, M_TEMP); 1956 vfs_freeopts(opts); 1957 return (error); 1958 } 1959 1960 1961 /* 1962 * struct jail_get_args { 1963 * struct iovec *iovp; 1964 * unsigned int iovcnt; 1965 * int flags; 1966 * }; 1967 */ 1968 int 1969 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1970 { 1971 struct uio *auio; 1972 int error; 1973 1974 /* Check that we have an even number of iovecs. */ 1975 if (uap->iovcnt & 1) 1976 return (EINVAL); 1977 1978 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1979 if (error) 1980 return (error); 1981 error = kern_jail_get(td, auio, uap->flags); 1982 if (error == 0) 1983 error = copyout(auio->uio_iov, uap->iovp, 1984 uap->iovcnt * sizeof (struct iovec)); 1985 free(auio, M_IOV); 1986 return (error); 1987 } 1988 1989 int 1990 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1991 { 1992 struct prison *pr, *mypr; 1993 struct vfsopt *opt; 1994 struct vfsoptlist *opts; 1995 char *errmsg, *name; 1996 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1997 1998 if (flags & ~JAIL_GET_MASK) 1999 return (EINVAL); 2000 2001 /* Get the parameter list. */ 2002 error = vfs_buildopts(optuio, &opts); 2003 if (error) 2004 return (error); 2005 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 2006 mypr = td->td_ucred->cr_prison; 2007 2008 /* 2009 * Find the prison specified by one of: lastjid, jid, name. 2010 */ 2011 sx_slock(&allprison_lock); 2012 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 2013 if (error == 0) { 2014 TAILQ_FOREACH(pr, &allprison, pr_list) { 2015 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 2016 mtx_lock(&pr->pr_mtx); 2017 if (pr->pr_ref > 0 && 2018 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 2019 break; 2020 mtx_unlock(&pr->pr_mtx); 2021 } 2022 } 2023 if (pr != NULL) 2024 goto found_prison; 2025 error = ENOENT; 2026 vfs_opterror(opts, "no jail after %d", jid); 2027 goto done_unlock_list; 2028 } else if (error != ENOENT) 2029 goto done_unlock_list; 2030 2031 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 2032 if (error == 0) { 2033 if (jid != 0) { 2034 pr = prison_find_child(mypr, jid); 2035 if (pr != NULL) { 2036 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2037 mtx_unlock(&pr->pr_mtx); 2038 error = ENOENT; 2039 vfs_opterror(opts, "jail %d is dying", 2040 jid); 2041 goto done_unlock_list; 2042 } 2043 goto found_prison; 2044 } 2045 error = ENOENT; 2046 vfs_opterror(opts, "jail %d not found", jid); 2047 goto done_unlock_list; 2048 } 2049 } else if (error != ENOENT) 2050 goto done_unlock_list; 2051 2052 error = vfs_getopt(opts, "name", (void **)&name, &len); 2053 if (error == 0) { 2054 if (len == 0 || name[len - 1] != '\0') { 2055 error = EINVAL; 2056 goto done_unlock_list; 2057 } 2058 pr = prison_find_name(mypr, name); 2059 if (pr != NULL) { 2060 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2061 mtx_unlock(&pr->pr_mtx); 2062 error = ENOENT; 2063 vfs_opterror(opts, "jail \"%s\" is dying", 2064 name); 2065 goto done_unlock_list; 2066 } 2067 goto found_prison; 2068 } 2069 error = ENOENT; 2070 vfs_opterror(opts, "jail \"%s\" not found", name); 2071 goto done_unlock_list; 2072 } else if (error != ENOENT) 2073 goto done_unlock_list; 2074 2075 vfs_opterror(opts, "no jail specified"); 2076 error = ENOENT; 2077 goto done_unlock_list; 2078 2079 found_prison: 2080 /* Get the parameters of the prison. */ 2081 pr->pr_ref++; 2082 locked = PD_LOCKED; 2083 td->td_retval[0] = pr->pr_id; 2084 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2085 if (error != 0 && error != ENOENT) 2086 goto done_deref; 2087 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2088 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2089 if (error != 0 && error != ENOENT) 2090 goto done_deref; 2091 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2092 if (error != 0 && error != ENOENT) 2093 goto done_deref; 2094 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2095 sizeof(pr->pr_cpuset->cs_id)); 2096 if (error != 0 && error != ENOENT) 2097 goto done_deref; 2098 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2099 if (error != 0 && error != ENOENT) 2100 goto done_deref; 2101 #ifdef INET 2102 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2103 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2104 if (error != 0 && error != ENOENT) 2105 goto done_deref; 2106 #endif 2107 #ifdef INET6 2108 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2109 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2110 if (error != 0 && error != ENOENT) 2111 goto done_deref; 2112 #endif 2113 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2114 sizeof(pr->pr_securelevel)); 2115 if (error != 0 && error != ENOENT) 2116 goto done_deref; 2117 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2118 sizeof(pr->pr_childcount)); 2119 if (error != 0 && error != ENOENT) 2120 goto done_deref; 2121 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2122 sizeof(pr->pr_childmax)); 2123 if (error != 0 && error != ENOENT) 2124 goto done_deref; 2125 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2126 if (error != 0 && error != ENOENT) 2127 goto done_deref; 2128 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2129 if (error != 0 && error != ENOENT) 2130 goto done_deref; 2131 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2132 if (error != 0 && error != ENOENT) 2133 goto done_deref; 2134 #ifdef COMPAT_FREEBSD32 2135 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2136 uint32_t hid32 = pr->pr_hostid; 2137 2138 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2139 } else 2140 #endif 2141 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2142 sizeof(pr->pr_hostid)); 2143 if (error != 0 && error != ENOENT) 2144 goto done_deref; 2145 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2146 sizeof(pr->pr_enforce_statfs)); 2147 if (error != 0 && error != ENOENT) 2148 goto done_deref; 2149 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2150 sizeof(pr->pr_devfs_rsnum)); 2151 if (error != 0 && error != ENOENT) 2152 goto done_deref; 2153 for (fi = 0; fi < nitems(pr_flag_names); fi++) { 2154 if (pr_flag_names[fi] == NULL) 2155 continue; 2156 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2157 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2158 if (error != 0 && error != ENOENT) 2159 goto done_deref; 2160 i = !i; 2161 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2162 if (error != 0 && error != ENOENT) 2163 goto done_deref; 2164 } 2165 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) { 2166 i = pr->pr_flags & 2167 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2168 i = pr_flag_jailsys[fi].disable && 2169 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2170 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2171 : JAIL_SYS_INHERIT; 2172 error = 2173 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2174 if (error != 0 && error != ENOENT) 2175 goto done_deref; 2176 } 2177 for (fi = 0; fi < nitems(pr_allow_names); fi++) { 2178 if (pr_allow_names[fi] == NULL) 2179 continue; 2180 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2181 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2182 if (error != 0 && error != ENOENT) 2183 goto done_deref; 2184 i = !i; 2185 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2186 if (error != 0 && error != ENOENT) 2187 goto done_deref; 2188 } 2189 i = (pr->pr_uref == 0); 2190 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2191 if (error != 0 && error != ENOENT) 2192 goto done_deref; 2193 i = !i; 2194 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2195 if (error != 0 && error != ENOENT) 2196 goto done_deref; 2197 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2198 sizeof(pr->pr_osreldate)); 2199 if (error != 0 && error != ENOENT) 2200 goto done_deref; 2201 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2202 if (error != 0 && error != ENOENT) 2203 goto done_deref; 2204 2205 /* Get the module parameters. */ 2206 mtx_unlock(&pr->pr_mtx); 2207 locked = 0; 2208 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2209 if (error) 2210 goto done_deref; 2211 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2212 2213 /* By now, all parameters should have been noted. */ 2214 TAILQ_FOREACH(opt, opts, link) { 2215 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2216 error = EINVAL; 2217 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2218 goto done_errmsg; 2219 } 2220 } 2221 2222 /* Write the fetched parameters back to userspace. */ 2223 error = 0; 2224 TAILQ_FOREACH(opt, opts, link) { 2225 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2226 pos = 2 * opt->pos + 1; 2227 optuio->uio_iov[pos].iov_len = opt->len; 2228 if (opt->value != NULL) { 2229 if (optuio->uio_segflg == UIO_SYSSPACE) { 2230 bcopy(opt->value, 2231 optuio->uio_iov[pos].iov_base, 2232 opt->len); 2233 } else { 2234 error = copyout(opt->value, 2235 optuio->uio_iov[pos].iov_base, 2236 opt->len); 2237 if (error) 2238 break; 2239 } 2240 } 2241 } 2242 } 2243 goto done_errmsg; 2244 2245 done_deref: 2246 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2247 goto done_errmsg; 2248 2249 done_unlock_list: 2250 sx_sunlock(&allprison_lock); 2251 done_errmsg: 2252 if (error && errmsg_pos >= 0) { 2253 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2254 errmsg_pos = 2 * errmsg_pos + 1; 2255 if (errmsg_len > 0) { 2256 if (optuio->uio_segflg == UIO_SYSSPACE) 2257 bcopy(errmsg, 2258 optuio->uio_iov[errmsg_pos].iov_base, 2259 errmsg_len); 2260 else 2261 copyout(errmsg, 2262 optuio->uio_iov[errmsg_pos].iov_base, 2263 errmsg_len); 2264 } 2265 } 2266 vfs_freeopts(opts); 2267 return (error); 2268 } 2269 2270 2271 /* 2272 * struct jail_remove_args { 2273 * int jid; 2274 * }; 2275 */ 2276 int 2277 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2278 { 2279 struct prison *pr, *cpr, *lpr, *tpr; 2280 int descend, error; 2281 2282 error = priv_check(td, PRIV_JAIL_REMOVE); 2283 if (error) 2284 return (error); 2285 2286 sx_xlock(&allprison_lock); 2287 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2288 if (pr == NULL) { 2289 sx_xunlock(&allprison_lock); 2290 return (EINVAL); 2291 } 2292 2293 /* Remove all descendants of this prison, then remove this prison. */ 2294 pr->pr_ref++; 2295 if (!LIST_EMPTY(&pr->pr_children)) { 2296 mtx_unlock(&pr->pr_mtx); 2297 lpr = NULL; 2298 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2299 mtx_lock(&cpr->pr_mtx); 2300 if (cpr->pr_ref > 0) { 2301 tpr = cpr; 2302 cpr->pr_ref++; 2303 } else { 2304 /* Already removed - do not do it again. */ 2305 tpr = NULL; 2306 } 2307 mtx_unlock(&cpr->pr_mtx); 2308 if (lpr != NULL) { 2309 mtx_lock(&lpr->pr_mtx); 2310 prison_remove_one(lpr); 2311 sx_xlock(&allprison_lock); 2312 } 2313 lpr = tpr; 2314 } 2315 if (lpr != NULL) { 2316 mtx_lock(&lpr->pr_mtx); 2317 prison_remove_one(lpr); 2318 sx_xlock(&allprison_lock); 2319 } 2320 mtx_lock(&pr->pr_mtx); 2321 } 2322 prison_remove_one(pr); 2323 return (0); 2324 } 2325 2326 static void 2327 prison_remove_one(struct prison *pr) 2328 { 2329 struct proc *p; 2330 int deuref; 2331 2332 /* If the prison was persistent, it is not anymore. */ 2333 deuref = 0; 2334 if (pr->pr_flags & PR_PERSIST) { 2335 pr->pr_ref--; 2336 deuref = PD_DEUREF; 2337 pr->pr_flags &= ~PR_PERSIST; 2338 } 2339 2340 /* 2341 * jail_remove added a reference. If that's the only one, remove 2342 * the prison now. 2343 */ 2344 KASSERT(pr->pr_ref > 0, 2345 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2346 if (pr->pr_ref == 1) { 2347 prison_deref(pr, 2348 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2349 return; 2350 } 2351 2352 mtx_unlock(&pr->pr_mtx); 2353 sx_xunlock(&allprison_lock); 2354 /* 2355 * Kill all processes unfortunate enough to be attached to this prison. 2356 */ 2357 sx_slock(&allproc_lock); 2358 LIST_FOREACH(p, &allproc, p_list) { 2359 PROC_LOCK(p); 2360 if (p->p_state != PRS_NEW && p->p_ucred && 2361 p->p_ucred->cr_prison == pr) 2362 kern_psignal(p, SIGKILL); 2363 PROC_UNLOCK(p); 2364 } 2365 sx_sunlock(&allproc_lock); 2366 /* Remove the temporary reference added by jail_remove. */ 2367 prison_deref(pr, deuref | PD_DEREF); 2368 } 2369 2370 2371 /* 2372 * struct jail_attach_args { 2373 * int jid; 2374 * }; 2375 */ 2376 int 2377 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2378 { 2379 struct prison *pr; 2380 int error; 2381 2382 error = priv_check(td, PRIV_JAIL_ATTACH); 2383 if (error) 2384 return (error); 2385 2386 sx_slock(&allprison_lock); 2387 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2388 if (pr == NULL) { 2389 sx_sunlock(&allprison_lock); 2390 return (EINVAL); 2391 } 2392 2393 /* 2394 * Do not allow a process to attach to a prison that is not 2395 * considered to be "alive". 2396 */ 2397 if (pr->pr_uref == 0) { 2398 mtx_unlock(&pr->pr_mtx); 2399 sx_sunlock(&allprison_lock); 2400 return (EINVAL); 2401 } 2402 2403 return (do_jail_attach(td, pr)); 2404 } 2405 2406 static int 2407 do_jail_attach(struct thread *td, struct prison *pr) 2408 { 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 p = td->td_proc; 2437 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2438 if (error) 2439 goto e_revert_osd; 2440 2441 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2442 if ((error = change_dir(pr->pr_root, td)) != 0) 2443 goto e_unlock; 2444 #ifdef MAC 2445 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2446 goto e_unlock; 2447 #endif 2448 VOP_UNLOCK(pr->pr_root, 0); 2449 if ((error = pwd_chroot(td, pr->pr_root))) 2450 goto e_revert_osd; 2451 2452 newcred = crget(); 2453 PROC_LOCK(p); 2454 oldcred = crcopysafe(p, newcred); 2455 newcred->cr_prison = pr; 2456 proc_set_cred(p, newcred); 2457 setsugid(p); 2458 PROC_UNLOCK(p); 2459 #ifdef RACCT 2460 racct_proc_ucred_changed(p, oldcred, newcred); 2461 #endif 2462 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF); 2463 crfree(oldcred); 2464 return (0); 2465 2466 e_unlock: 2467 VOP_UNLOCK(pr->pr_root, 0); 2468 e_revert_osd: 2469 /* Tell modules this thread is still in its old jail after all. */ 2470 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2471 prison_deref(pr, PD_DEREF | PD_DEUREF); 2472 return (error); 2473 } 2474 2475 2476 /* 2477 * Returns a locked prison instance, or NULL on failure. 2478 */ 2479 struct prison * 2480 prison_find(int prid) 2481 { 2482 struct prison *pr; 2483 2484 sx_assert(&allprison_lock, SX_LOCKED); 2485 TAILQ_FOREACH(pr, &allprison, pr_list) { 2486 if (pr->pr_id == prid) { 2487 mtx_lock(&pr->pr_mtx); 2488 if (pr->pr_ref > 0) 2489 return (pr); 2490 mtx_unlock(&pr->pr_mtx); 2491 } 2492 } 2493 return (NULL); 2494 } 2495 2496 /* 2497 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2498 */ 2499 struct prison * 2500 prison_find_child(struct prison *mypr, int prid) 2501 { 2502 struct prison *pr; 2503 int descend; 2504 2505 sx_assert(&allprison_lock, SX_LOCKED); 2506 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2507 if (pr->pr_id == prid) { 2508 mtx_lock(&pr->pr_mtx); 2509 if (pr->pr_ref > 0) 2510 return (pr); 2511 mtx_unlock(&pr->pr_mtx); 2512 } 2513 } 2514 return (NULL); 2515 } 2516 2517 /* 2518 * Look for the name relative to mypr. Returns a locked prison or NULL. 2519 */ 2520 struct prison * 2521 prison_find_name(struct prison *mypr, const char *name) 2522 { 2523 struct prison *pr, *deadpr; 2524 size_t mylen; 2525 int descend; 2526 2527 sx_assert(&allprison_lock, SX_LOCKED); 2528 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2529 again: 2530 deadpr = NULL; 2531 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2532 if (!strcmp(pr->pr_name + mylen, name)) { 2533 mtx_lock(&pr->pr_mtx); 2534 if (pr->pr_ref > 0) { 2535 if (pr->pr_uref > 0) 2536 return (pr); 2537 deadpr = pr; 2538 } 2539 mtx_unlock(&pr->pr_mtx); 2540 } 2541 } 2542 /* There was no valid prison - perhaps there was a dying one. */ 2543 if (deadpr != NULL) { 2544 mtx_lock(&deadpr->pr_mtx); 2545 if (deadpr->pr_ref == 0) { 2546 mtx_unlock(&deadpr->pr_mtx); 2547 goto again; 2548 } 2549 } 2550 return (deadpr); 2551 } 2552 2553 /* 2554 * See if a prison has the specific flag set. 2555 */ 2556 int 2557 prison_flag(struct ucred *cred, unsigned flag) 2558 { 2559 2560 /* This is an atomic read, so no locking is necessary. */ 2561 return (cred->cr_prison->pr_flags & flag); 2562 } 2563 2564 int 2565 prison_allow(struct ucred *cred, unsigned flag) 2566 { 2567 2568 /* This is an atomic read, so no locking is necessary. */ 2569 return (cred->cr_prison->pr_allow & flag); 2570 } 2571 2572 /* 2573 * Remove a prison reference. If that was the last reference, remove the 2574 * prison itself - but not in this context in case there are locks held. 2575 */ 2576 void 2577 prison_free_locked(struct prison *pr) 2578 { 2579 int ref; 2580 2581 mtx_assert(&pr->pr_mtx, MA_OWNED); 2582 ref = --pr->pr_ref; 2583 mtx_unlock(&pr->pr_mtx); 2584 if (ref == 0) 2585 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2586 } 2587 2588 void 2589 prison_free(struct prison *pr) 2590 { 2591 2592 mtx_lock(&pr->pr_mtx); 2593 prison_free_locked(pr); 2594 } 2595 2596 /* 2597 * Complete a call to either prison_free or prison_proc_free. 2598 */ 2599 static void 2600 prison_complete(void *context, int pending) 2601 { 2602 struct prison *pr = context; 2603 2604 mtx_lock(&pr->pr_mtx); 2605 prison_deref(pr, pr->pr_uref 2606 ? PD_DEREF | PD_DEUREF | PD_LOCKED : PD_LOCKED); 2607 } 2608 2609 /* 2610 * Remove a prison reference (usually). This internal version assumes no 2611 * mutexes are held, except perhaps the prison itself. If there are no more 2612 * references, release and delist the prison. On completion, the prison lock 2613 * and the allprison lock are both unlocked. 2614 */ 2615 static void 2616 prison_deref(struct prison *pr, int flags) 2617 { 2618 struct prison *ppr, *tpr; 2619 int ref, lasturef; 2620 2621 if (!(flags & PD_LOCKED)) 2622 mtx_lock(&pr->pr_mtx); 2623 for (;;) { 2624 if (flags & PD_DEUREF) { 2625 KASSERT(pr->pr_uref > 0, 2626 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 2627 pr->pr_id)); 2628 pr->pr_uref--; 2629 lasturef = pr->pr_uref == 0; 2630 if (lasturef) 2631 pr->pr_ref++; 2632 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2633 } else 2634 lasturef = 0; 2635 if (flags & PD_DEREF) { 2636 KASSERT(pr->pr_ref > 0, 2637 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 2638 pr->pr_id)); 2639 pr->pr_ref--; 2640 } 2641 ref = pr->pr_ref; 2642 mtx_unlock(&pr->pr_mtx); 2643 2644 /* 2645 * Tell the modules if the last user reference was removed 2646 * (even it sticks around in dying state). 2647 */ 2648 if (lasturef) { 2649 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) { 2650 if (ref > 1) { 2651 sx_slock(&allprison_lock); 2652 flags |= PD_LIST_SLOCKED; 2653 } else { 2654 sx_xlock(&allprison_lock); 2655 flags |= PD_LIST_XLOCKED; 2656 } 2657 } 2658 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 2659 mtx_lock(&pr->pr_mtx); 2660 ref = --pr->pr_ref; 2661 mtx_unlock(&pr->pr_mtx); 2662 } 2663 2664 /* If the prison still has references, nothing else to do. */ 2665 if (ref > 0) { 2666 if (flags & PD_LIST_SLOCKED) 2667 sx_sunlock(&allprison_lock); 2668 else if (flags & PD_LIST_XLOCKED) 2669 sx_xunlock(&allprison_lock); 2670 return; 2671 } 2672 2673 if (flags & PD_LIST_SLOCKED) { 2674 if (!sx_try_upgrade(&allprison_lock)) { 2675 sx_sunlock(&allprison_lock); 2676 sx_xlock(&allprison_lock); 2677 } 2678 } else if (!(flags & PD_LIST_XLOCKED)) 2679 sx_xlock(&allprison_lock); 2680 2681 TAILQ_REMOVE(&allprison, pr, pr_list); 2682 LIST_REMOVE(pr, pr_sibling); 2683 ppr = pr->pr_parent; 2684 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2685 tpr->pr_childcount--; 2686 sx_xunlock(&allprison_lock); 2687 2688 #ifdef VIMAGE 2689 if (pr->pr_vnet != ppr->pr_vnet) 2690 vnet_destroy(pr->pr_vnet); 2691 #endif 2692 if (pr->pr_root != NULL) 2693 vrele(pr->pr_root); 2694 mtx_destroy(&pr->pr_mtx); 2695 #ifdef INET 2696 free(pr->pr_ip4, M_PRISON); 2697 #endif 2698 #ifdef INET6 2699 free(pr->pr_ip6, M_PRISON); 2700 #endif 2701 if (pr->pr_cpuset != NULL) 2702 cpuset_rel(pr->pr_cpuset); 2703 osd_jail_exit(pr); 2704 #ifdef RACCT 2705 if (racct_enable) 2706 prison_racct_detach(pr); 2707 #endif 2708 free(pr, M_PRISON); 2709 2710 /* Removing a prison frees a reference on its parent. */ 2711 pr = ppr; 2712 mtx_lock(&pr->pr_mtx); 2713 flags = PD_DEREF | PD_DEUREF; 2714 } 2715 } 2716 2717 void 2718 prison_hold_locked(struct prison *pr) 2719 { 2720 2721 mtx_assert(&pr->pr_mtx, MA_OWNED); 2722 KASSERT(pr->pr_ref > 0, 2723 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2724 pr->pr_ref++; 2725 } 2726 2727 void 2728 prison_hold(struct prison *pr) 2729 { 2730 2731 mtx_lock(&pr->pr_mtx); 2732 prison_hold_locked(pr); 2733 mtx_unlock(&pr->pr_mtx); 2734 } 2735 2736 void 2737 prison_proc_hold(struct prison *pr) 2738 { 2739 2740 mtx_lock(&pr->pr_mtx); 2741 KASSERT(pr->pr_uref > 0, 2742 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2743 pr->pr_uref++; 2744 mtx_unlock(&pr->pr_mtx); 2745 } 2746 2747 void 2748 prison_proc_free(struct prison *pr) 2749 { 2750 2751 mtx_lock(&pr->pr_mtx); 2752 KASSERT(pr->pr_uref > 0, 2753 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2754 if (pr->pr_uref > 1) 2755 pr->pr_uref--; 2756 else { 2757 /* 2758 * Don't remove the last user reference in this context, which 2759 * is expected to be a process that is not only locked, but 2760 * also half dead. 2761 */ 2762 pr->pr_ref++; 2763 mtx_unlock(&pr->pr_mtx); 2764 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2765 return; 2766 } 2767 mtx_unlock(&pr->pr_mtx); 2768 } 2769 2770 2771 #ifdef INET 2772 /* 2773 * Restrict a prison's IP address list with its parent's, possibly replacing 2774 * it. Return true if the replacement buffer was used (or would have been). 2775 */ 2776 static int 2777 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2778 { 2779 int ii, ij, used; 2780 struct prison *ppr; 2781 2782 ppr = pr->pr_parent; 2783 if (!(pr->pr_flags & PR_IP4_USER)) { 2784 /* This has no user settings, so just copy the parent's list. */ 2785 if (pr->pr_ip4s < ppr->pr_ip4s) { 2786 /* 2787 * There's no room for the parent's list. Use the 2788 * new list buffer, which is assumed to be big enough 2789 * (if it was passed). If there's no buffer, try to 2790 * allocate one. 2791 */ 2792 used = 1; 2793 if (newip4 == NULL) { 2794 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2795 M_PRISON, M_NOWAIT); 2796 if (newip4 != NULL) 2797 used = 0; 2798 } 2799 if (newip4 != NULL) { 2800 bcopy(ppr->pr_ip4, newip4, 2801 ppr->pr_ip4s * sizeof(*newip4)); 2802 free(pr->pr_ip4, M_PRISON); 2803 pr->pr_ip4 = newip4; 2804 pr->pr_ip4s = ppr->pr_ip4s; 2805 } 2806 return (used); 2807 } 2808 pr->pr_ip4s = ppr->pr_ip4s; 2809 if (pr->pr_ip4s > 0) 2810 bcopy(ppr->pr_ip4, pr->pr_ip4, 2811 pr->pr_ip4s * sizeof(*newip4)); 2812 else if (pr->pr_ip4 != NULL) { 2813 free(pr->pr_ip4, M_PRISON); 2814 pr->pr_ip4 = NULL; 2815 } 2816 } else if (pr->pr_ip4s > 0) { 2817 /* Remove addresses that aren't in the parent. */ 2818 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2819 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2820 break; 2821 if (ij < ppr->pr_ip4s) 2822 ii = 1; 2823 else { 2824 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2825 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2826 ii = 0; 2827 } 2828 for (ij = 1; ii < pr->pr_ip4s; ) { 2829 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2830 ii++; 2831 continue; 2832 } 2833 switch (ij >= ppr->pr_ip4s ? -1 : 2834 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2835 case -1: 2836 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2837 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2838 break; 2839 case 0: 2840 ii++; 2841 ij++; 2842 break; 2843 case 1: 2844 ij++; 2845 break; 2846 } 2847 } 2848 if (pr->pr_ip4s == 0) { 2849 free(pr->pr_ip4, M_PRISON); 2850 pr->pr_ip4 = NULL; 2851 } 2852 } 2853 return (0); 2854 } 2855 2856 /* 2857 * Pass back primary IPv4 address of this jail. 2858 * 2859 * If not restricted return success but do not alter the address. Caller has 2860 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2861 * 2862 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2863 * Address returned in NBO. 2864 */ 2865 int 2866 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2867 { 2868 struct prison *pr; 2869 2870 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2871 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2872 2873 pr = cred->cr_prison; 2874 if (!(pr->pr_flags & PR_IP4)) 2875 return (0); 2876 mtx_lock(&pr->pr_mtx); 2877 if (!(pr->pr_flags & PR_IP4)) { 2878 mtx_unlock(&pr->pr_mtx); 2879 return (0); 2880 } 2881 if (pr->pr_ip4 == NULL) { 2882 mtx_unlock(&pr->pr_mtx); 2883 return (EAFNOSUPPORT); 2884 } 2885 2886 ia->s_addr = pr->pr_ip4[0].s_addr; 2887 mtx_unlock(&pr->pr_mtx); 2888 return (0); 2889 } 2890 2891 /* 2892 * Return 1 if we should do proper source address selection or are not jailed. 2893 * We will return 0 if we should bypass source address selection in favour 2894 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2895 * returned in NBO. 2896 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2897 */ 2898 int 2899 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2900 { 2901 struct prison *pr; 2902 struct in_addr lia; 2903 int error; 2904 2905 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2906 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2907 2908 if (!jailed(cred)) 2909 return (1); 2910 2911 pr = cred->cr_prison; 2912 if (pr->pr_flags & PR_IP4_SADDRSEL) 2913 return (1); 2914 2915 lia.s_addr = INADDR_ANY; 2916 error = prison_get_ip4(cred, &lia); 2917 if (error) 2918 return (error); 2919 if (lia.s_addr == INADDR_ANY) 2920 return (1); 2921 2922 ia->s_addr = lia.s_addr; 2923 return (0); 2924 } 2925 2926 /* 2927 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2928 */ 2929 int 2930 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2931 { 2932 2933 if (pr1 == pr2) 2934 return (1); 2935 2936 /* 2937 * No need to lock since the PR_IP4_USER flag can't be altered for 2938 * existing prisons. 2939 */ 2940 while (pr1 != &prison0 && 2941 #ifdef VIMAGE 2942 !(pr1->pr_flags & PR_VNET) && 2943 #endif 2944 !(pr1->pr_flags & PR_IP4_USER)) 2945 pr1 = pr1->pr_parent; 2946 while (pr2 != &prison0 && 2947 #ifdef VIMAGE 2948 !(pr2->pr_flags & PR_VNET) && 2949 #endif 2950 !(pr2->pr_flags & PR_IP4_USER)) 2951 pr2 = pr2->pr_parent; 2952 return (pr1 == pr2); 2953 } 2954 2955 /* 2956 * Make sure our (source) address is set to something meaningful to this 2957 * jail. 2958 * 2959 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2960 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2961 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2962 */ 2963 int 2964 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2965 { 2966 struct prison *pr; 2967 struct in_addr ia0; 2968 int error; 2969 2970 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2971 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2972 2973 pr = cred->cr_prison; 2974 if (!(pr->pr_flags & PR_IP4)) 2975 return (0); 2976 mtx_lock(&pr->pr_mtx); 2977 if (!(pr->pr_flags & PR_IP4)) { 2978 mtx_unlock(&pr->pr_mtx); 2979 return (0); 2980 } 2981 if (pr->pr_ip4 == NULL) { 2982 mtx_unlock(&pr->pr_mtx); 2983 return (EAFNOSUPPORT); 2984 } 2985 2986 ia0.s_addr = ntohl(ia->s_addr); 2987 if (ia0.s_addr == INADDR_LOOPBACK) { 2988 ia->s_addr = pr->pr_ip4[0].s_addr; 2989 mtx_unlock(&pr->pr_mtx); 2990 return (0); 2991 } 2992 2993 if (ia0.s_addr == INADDR_ANY) { 2994 /* 2995 * In case there is only 1 IPv4 address, bind directly. 2996 */ 2997 if (pr->pr_ip4s == 1) 2998 ia->s_addr = pr->pr_ip4[0].s_addr; 2999 mtx_unlock(&pr->pr_mtx); 3000 return (0); 3001 } 3002 3003 error = _prison_check_ip4(pr, ia); 3004 mtx_unlock(&pr->pr_mtx); 3005 return (error); 3006 } 3007 3008 /* 3009 * Rewrite destination address in case we will connect to loopback address. 3010 * 3011 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 3012 * Address passed in in NBO and returned in NBO. 3013 */ 3014 int 3015 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 3016 { 3017 struct prison *pr; 3018 3019 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3020 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 3021 3022 pr = cred->cr_prison; 3023 if (!(pr->pr_flags & PR_IP4)) 3024 return (0); 3025 mtx_lock(&pr->pr_mtx); 3026 if (!(pr->pr_flags & PR_IP4)) { 3027 mtx_unlock(&pr->pr_mtx); 3028 return (0); 3029 } 3030 if (pr->pr_ip4 == NULL) { 3031 mtx_unlock(&pr->pr_mtx); 3032 return (EAFNOSUPPORT); 3033 } 3034 3035 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 3036 ia->s_addr = pr->pr_ip4[0].s_addr; 3037 mtx_unlock(&pr->pr_mtx); 3038 return (0); 3039 } 3040 3041 /* 3042 * Return success because nothing had to be changed. 3043 */ 3044 mtx_unlock(&pr->pr_mtx); 3045 return (0); 3046 } 3047 3048 /* 3049 * Check if given address belongs to the jail referenced by cred/prison. 3050 * 3051 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 3052 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3053 * doesn't allow IPv4. Address passed in in NBO. 3054 */ 3055 static int 3056 _prison_check_ip4(const struct prison *pr, const struct in_addr *ia) 3057 { 3058 int i, a, z, d; 3059 3060 /* 3061 * Check the primary IP. 3062 */ 3063 if (pr->pr_ip4[0].s_addr == ia->s_addr) 3064 return (0); 3065 3066 /* 3067 * All the other IPs are sorted so we can do a binary search. 3068 */ 3069 a = 0; 3070 z = pr->pr_ip4s - 2; 3071 while (a <= z) { 3072 i = (a + z) / 2; 3073 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 3074 if (d > 0) 3075 z = i - 1; 3076 else if (d < 0) 3077 a = i + 1; 3078 else 3079 return (0); 3080 } 3081 3082 return (EADDRNOTAVAIL); 3083 } 3084 3085 int 3086 prison_check_ip4(const struct ucred *cred, const struct in_addr *ia) 3087 { 3088 struct prison *pr; 3089 int error; 3090 3091 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3092 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 3093 3094 pr = cred->cr_prison; 3095 if (!(pr->pr_flags & PR_IP4)) 3096 return (0); 3097 mtx_lock(&pr->pr_mtx); 3098 if (!(pr->pr_flags & PR_IP4)) { 3099 mtx_unlock(&pr->pr_mtx); 3100 return (0); 3101 } 3102 if (pr->pr_ip4 == NULL) { 3103 mtx_unlock(&pr->pr_mtx); 3104 return (EAFNOSUPPORT); 3105 } 3106 3107 error = _prison_check_ip4(pr, ia); 3108 mtx_unlock(&pr->pr_mtx); 3109 return (error); 3110 } 3111 #endif 3112 3113 #ifdef INET6 3114 static int 3115 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 3116 { 3117 int ii, ij, used; 3118 struct prison *ppr; 3119 3120 ppr = pr->pr_parent; 3121 if (!(pr->pr_flags & PR_IP6_USER)) { 3122 /* This has no user settings, so just copy the parent's list. */ 3123 if (pr->pr_ip6s < ppr->pr_ip6s) { 3124 /* 3125 * There's no room for the parent's list. Use the 3126 * new list buffer, which is assumed to be big enough 3127 * (if it was passed). If there's no buffer, try to 3128 * allocate one. 3129 */ 3130 used = 1; 3131 if (newip6 == NULL) { 3132 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 3133 M_PRISON, M_NOWAIT); 3134 if (newip6 != NULL) 3135 used = 0; 3136 } 3137 if (newip6 != NULL) { 3138 bcopy(ppr->pr_ip6, newip6, 3139 ppr->pr_ip6s * sizeof(*newip6)); 3140 free(pr->pr_ip6, M_PRISON); 3141 pr->pr_ip6 = newip6; 3142 pr->pr_ip6s = ppr->pr_ip6s; 3143 } 3144 return (used); 3145 } 3146 pr->pr_ip6s = ppr->pr_ip6s; 3147 if (pr->pr_ip6s > 0) 3148 bcopy(ppr->pr_ip6, pr->pr_ip6, 3149 pr->pr_ip6s * sizeof(*newip6)); 3150 else if (pr->pr_ip6 != NULL) { 3151 free(pr->pr_ip6, M_PRISON); 3152 pr->pr_ip6 = NULL; 3153 } 3154 } else if (pr->pr_ip6s > 0) { 3155 /* Remove addresses that aren't in the parent. */ 3156 for (ij = 0; ij < ppr->pr_ip6s; ij++) 3157 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 3158 &ppr->pr_ip6[ij])) 3159 break; 3160 if (ij < ppr->pr_ip6s) 3161 ii = 1; 3162 else { 3163 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 3164 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 3165 ii = 0; 3166 } 3167 for (ij = 1; ii < pr->pr_ip6s; ) { 3168 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 3169 &ppr->pr_ip6[0])) { 3170 ii++; 3171 continue; 3172 } 3173 switch (ij >= ppr->pr_ip6s ? -1 : 3174 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 3175 case -1: 3176 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 3177 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 3178 break; 3179 case 0: 3180 ii++; 3181 ij++; 3182 break; 3183 case 1: 3184 ij++; 3185 break; 3186 } 3187 } 3188 if (pr->pr_ip6s == 0) { 3189 free(pr->pr_ip6, M_PRISON); 3190 pr->pr_ip6 = NULL; 3191 } 3192 } 3193 return 0; 3194 } 3195 3196 /* 3197 * Pass back primary IPv6 address for this jail. 3198 * 3199 * If not restricted return success but do not alter the address. Caller has 3200 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3201 * 3202 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3203 */ 3204 int 3205 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3206 { 3207 struct prison *pr; 3208 3209 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3210 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3211 3212 pr = cred->cr_prison; 3213 if (!(pr->pr_flags & PR_IP6)) 3214 return (0); 3215 mtx_lock(&pr->pr_mtx); 3216 if (!(pr->pr_flags & PR_IP6)) { 3217 mtx_unlock(&pr->pr_mtx); 3218 return (0); 3219 } 3220 if (pr->pr_ip6 == NULL) { 3221 mtx_unlock(&pr->pr_mtx); 3222 return (EAFNOSUPPORT); 3223 } 3224 3225 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3226 mtx_unlock(&pr->pr_mtx); 3227 return (0); 3228 } 3229 3230 /* 3231 * Return 1 if we should do proper source address selection or are not jailed. 3232 * We will return 0 if we should bypass source address selection in favour 3233 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3234 * returned in NBO. 3235 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3236 */ 3237 int 3238 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3239 { 3240 struct prison *pr; 3241 struct in6_addr lia6; 3242 int error; 3243 3244 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3245 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3246 3247 if (!jailed(cred)) 3248 return (1); 3249 3250 pr = cred->cr_prison; 3251 if (pr->pr_flags & PR_IP6_SADDRSEL) 3252 return (1); 3253 3254 lia6 = in6addr_any; 3255 error = prison_get_ip6(cred, &lia6); 3256 if (error) 3257 return (error); 3258 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3259 return (1); 3260 3261 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3262 return (0); 3263 } 3264 3265 /* 3266 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3267 */ 3268 int 3269 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3270 { 3271 3272 if (pr1 == pr2) 3273 return (1); 3274 3275 while (pr1 != &prison0 && 3276 #ifdef VIMAGE 3277 !(pr1->pr_flags & PR_VNET) && 3278 #endif 3279 !(pr1->pr_flags & PR_IP6_USER)) 3280 pr1 = pr1->pr_parent; 3281 while (pr2 != &prison0 && 3282 #ifdef VIMAGE 3283 !(pr2->pr_flags & PR_VNET) && 3284 #endif 3285 !(pr2->pr_flags & PR_IP6_USER)) 3286 pr2 = pr2->pr_parent; 3287 return (pr1 == pr2); 3288 } 3289 3290 /* 3291 * Make sure our (source) address is set to something meaningful to this jail. 3292 * 3293 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3294 * when needed while binding. 3295 * 3296 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3297 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3298 * doesn't allow IPv6. 3299 */ 3300 int 3301 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3302 { 3303 struct prison *pr; 3304 int error; 3305 3306 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3307 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3308 3309 pr = cred->cr_prison; 3310 if (!(pr->pr_flags & PR_IP6)) 3311 return (0); 3312 mtx_lock(&pr->pr_mtx); 3313 if (!(pr->pr_flags & PR_IP6)) { 3314 mtx_unlock(&pr->pr_mtx); 3315 return (0); 3316 } 3317 if (pr->pr_ip6 == NULL) { 3318 mtx_unlock(&pr->pr_mtx); 3319 return (EAFNOSUPPORT); 3320 } 3321 3322 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3323 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3324 mtx_unlock(&pr->pr_mtx); 3325 return (0); 3326 } 3327 3328 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3329 /* 3330 * In case there is only 1 IPv6 address, and v6only is true, 3331 * then bind directly. 3332 */ 3333 if (v6only != 0 && pr->pr_ip6s == 1) 3334 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3335 mtx_unlock(&pr->pr_mtx); 3336 return (0); 3337 } 3338 3339 error = _prison_check_ip6(pr, ia6); 3340 mtx_unlock(&pr->pr_mtx); 3341 return (error); 3342 } 3343 3344 /* 3345 * Rewrite destination address in case we will connect to loopback address. 3346 * 3347 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3348 */ 3349 int 3350 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3351 { 3352 struct prison *pr; 3353 3354 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3355 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3356 3357 pr = cred->cr_prison; 3358 if (!(pr->pr_flags & PR_IP6)) 3359 return (0); 3360 mtx_lock(&pr->pr_mtx); 3361 if (!(pr->pr_flags & PR_IP6)) { 3362 mtx_unlock(&pr->pr_mtx); 3363 return (0); 3364 } 3365 if (pr->pr_ip6 == NULL) { 3366 mtx_unlock(&pr->pr_mtx); 3367 return (EAFNOSUPPORT); 3368 } 3369 3370 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3371 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3372 mtx_unlock(&pr->pr_mtx); 3373 return (0); 3374 } 3375 3376 /* 3377 * Return success because nothing had to be changed. 3378 */ 3379 mtx_unlock(&pr->pr_mtx); 3380 return (0); 3381 } 3382 3383 /* 3384 * Check if given address belongs to the jail referenced by cred/prison. 3385 * 3386 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3387 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3388 * doesn't allow IPv6. 3389 */ 3390 static int 3391 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3392 { 3393 int i, a, z, d; 3394 3395 /* 3396 * Check the primary IP. 3397 */ 3398 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3399 return (0); 3400 3401 /* 3402 * All the other IPs are sorted so we can do a binary search. 3403 */ 3404 a = 0; 3405 z = pr->pr_ip6s - 2; 3406 while (a <= z) { 3407 i = (a + z) / 2; 3408 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3409 if (d > 0) 3410 z = i - 1; 3411 else if (d < 0) 3412 a = i + 1; 3413 else 3414 return (0); 3415 } 3416 3417 return (EADDRNOTAVAIL); 3418 } 3419 3420 int 3421 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3422 { 3423 struct prison *pr; 3424 int error; 3425 3426 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3427 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3428 3429 pr = cred->cr_prison; 3430 if (!(pr->pr_flags & PR_IP6)) 3431 return (0); 3432 mtx_lock(&pr->pr_mtx); 3433 if (!(pr->pr_flags & PR_IP6)) { 3434 mtx_unlock(&pr->pr_mtx); 3435 return (0); 3436 } 3437 if (pr->pr_ip6 == NULL) { 3438 mtx_unlock(&pr->pr_mtx); 3439 return (EAFNOSUPPORT); 3440 } 3441 3442 error = _prison_check_ip6(pr, ia6); 3443 mtx_unlock(&pr->pr_mtx); 3444 return (error); 3445 } 3446 #endif 3447 3448 /* 3449 * Check if a jail supports the given address family. 3450 * 3451 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3452 * if not. 3453 */ 3454 int 3455 prison_check_af(struct ucred *cred, int af) 3456 { 3457 struct prison *pr; 3458 int error; 3459 3460 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3461 3462 pr = cred->cr_prison; 3463 #ifdef VIMAGE 3464 /* Prisons with their own network stack are not limited. */ 3465 if (prison_owns_vnet(cred)) 3466 return (0); 3467 #endif 3468 3469 error = 0; 3470 switch (af) 3471 { 3472 #ifdef INET 3473 case AF_INET: 3474 if (pr->pr_flags & PR_IP4) 3475 { 3476 mtx_lock(&pr->pr_mtx); 3477 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3478 error = EAFNOSUPPORT; 3479 mtx_unlock(&pr->pr_mtx); 3480 } 3481 break; 3482 #endif 3483 #ifdef INET6 3484 case AF_INET6: 3485 if (pr->pr_flags & PR_IP6) 3486 { 3487 mtx_lock(&pr->pr_mtx); 3488 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3489 error = EAFNOSUPPORT; 3490 mtx_unlock(&pr->pr_mtx); 3491 } 3492 break; 3493 #endif 3494 case AF_LOCAL: 3495 case AF_ROUTE: 3496 break; 3497 default: 3498 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3499 error = EAFNOSUPPORT; 3500 } 3501 return (error); 3502 } 3503 3504 /* 3505 * Check if given address belongs to the jail referenced by cred (wrapper to 3506 * prison_check_ip[46]). 3507 * 3508 * Returns 0 if jail doesn't restrict the address family or if address belongs 3509 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3510 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3511 */ 3512 int 3513 prison_if(struct ucred *cred, struct sockaddr *sa) 3514 { 3515 #ifdef INET 3516 struct sockaddr_in *sai; 3517 #endif 3518 #ifdef INET6 3519 struct sockaddr_in6 *sai6; 3520 #endif 3521 int error; 3522 3523 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3524 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3525 3526 #ifdef VIMAGE 3527 if (prison_owns_vnet(cred)) 3528 return (0); 3529 #endif 3530 3531 error = 0; 3532 switch (sa->sa_family) 3533 { 3534 #ifdef INET 3535 case AF_INET: 3536 sai = (struct sockaddr_in *)sa; 3537 error = prison_check_ip4(cred, &sai->sin_addr); 3538 break; 3539 #endif 3540 #ifdef INET6 3541 case AF_INET6: 3542 sai6 = (struct sockaddr_in6 *)sa; 3543 error = prison_check_ip6(cred, &sai6->sin6_addr); 3544 break; 3545 #endif 3546 default: 3547 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3548 error = EAFNOSUPPORT; 3549 } 3550 return (error); 3551 } 3552 3553 /* 3554 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3555 */ 3556 int 3557 prison_check(struct ucred *cred1, struct ucred *cred2) 3558 { 3559 3560 return ((cred1->cr_prison == cred2->cr_prison || 3561 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3562 } 3563 3564 /* 3565 * Return 1 if p2 is a child of p1, otherwise 0. 3566 */ 3567 int 3568 prison_ischild(struct prison *pr1, struct prison *pr2) 3569 { 3570 3571 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3572 if (pr1 == pr2) 3573 return (1); 3574 return (0); 3575 } 3576 3577 /* 3578 * Return 1 if the passed credential is in a jail, otherwise 0. 3579 */ 3580 int 3581 jailed(struct ucred *cred) 3582 { 3583 3584 return (cred->cr_prison != &prison0); 3585 } 3586 3587 /* 3588 * Return 1 if the passed credential is in a jail and that jail does not 3589 * have its own virtual network stack, otherwise 0. 3590 */ 3591 int 3592 jailed_without_vnet(struct ucred *cred) 3593 { 3594 3595 if (!jailed(cred)) 3596 return (0); 3597 #ifdef VIMAGE 3598 if (prison_owns_vnet(cred)) 3599 return (0); 3600 #endif 3601 3602 return (1); 3603 } 3604 3605 /* 3606 * Return the correct hostname (domainname, et al) for the passed credential. 3607 */ 3608 void 3609 getcredhostname(struct ucred *cred, char *buf, size_t size) 3610 { 3611 struct prison *pr; 3612 3613 /* 3614 * A NULL credential can be used to shortcut to the physical 3615 * system's hostname. 3616 */ 3617 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3618 mtx_lock(&pr->pr_mtx); 3619 strlcpy(buf, pr->pr_hostname, size); 3620 mtx_unlock(&pr->pr_mtx); 3621 } 3622 3623 void 3624 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3625 { 3626 3627 mtx_lock(&cred->cr_prison->pr_mtx); 3628 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3629 mtx_unlock(&cred->cr_prison->pr_mtx); 3630 } 3631 3632 void 3633 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3634 { 3635 3636 mtx_lock(&cred->cr_prison->pr_mtx); 3637 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3638 mtx_unlock(&cred->cr_prison->pr_mtx); 3639 } 3640 3641 void 3642 getcredhostid(struct ucred *cred, unsigned long *hostid) 3643 { 3644 3645 mtx_lock(&cred->cr_prison->pr_mtx); 3646 *hostid = cred->cr_prison->pr_hostid; 3647 mtx_unlock(&cred->cr_prison->pr_mtx); 3648 } 3649 3650 #ifdef VIMAGE 3651 /* 3652 * Determine whether the prison represented by cred owns 3653 * its vnet rather than having it inherited. 3654 * 3655 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3656 */ 3657 int 3658 prison_owns_vnet(struct ucred *cred) 3659 { 3660 3661 /* 3662 * vnets cannot be added/removed after jail creation, 3663 * so no need to lock here. 3664 */ 3665 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3666 } 3667 #endif 3668 3669 /* 3670 * Determine whether the subject represented by cred can "see" 3671 * status of a mount point. 3672 * Returns: 0 for permitted, ENOENT otherwise. 3673 * XXX: This function should be called cr_canseemount() and should be 3674 * placed in kern_prot.c. 3675 */ 3676 int 3677 prison_canseemount(struct ucred *cred, struct mount *mp) 3678 { 3679 struct prison *pr; 3680 struct statfs *sp; 3681 size_t len; 3682 3683 pr = cred->cr_prison; 3684 if (pr->pr_enforce_statfs == 0) 3685 return (0); 3686 if (pr->pr_root->v_mount == mp) 3687 return (0); 3688 if (pr->pr_enforce_statfs == 2) 3689 return (ENOENT); 3690 /* 3691 * If jail's chroot directory is set to "/" we should be able to see 3692 * all mount-points from inside a jail. 3693 * This is ugly check, but this is the only situation when jail's 3694 * directory ends with '/'. 3695 */ 3696 if (strcmp(pr->pr_path, "/") == 0) 3697 return (0); 3698 len = strlen(pr->pr_path); 3699 sp = &mp->mnt_stat; 3700 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3701 return (ENOENT); 3702 /* 3703 * Be sure that we don't have situation where jail's root directory 3704 * is "/some/path" and mount point is "/some/pathpath". 3705 */ 3706 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3707 return (ENOENT); 3708 return (0); 3709 } 3710 3711 void 3712 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3713 { 3714 char jpath[MAXPATHLEN]; 3715 struct prison *pr; 3716 size_t len; 3717 3718 pr = cred->cr_prison; 3719 if (pr->pr_enforce_statfs == 0) 3720 return; 3721 if (prison_canseemount(cred, mp) != 0) { 3722 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3723 strlcpy(sp->f_mntonname, "[restricted]", 3724 sizeof(sp->f_mntonname)); 3725 return; 3726 } 3727 if (pr->pr_root->v_mount == mp) { 3728 /* 3729 * Clear current buffer data, so we are sure nothing from 3730 * the valid path left there. 3731 */ 3732 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3733 *sp->f_mntonname = '/'; 3734 return; 3735 } 3736 /* 3737 * If jail's chroot directory is set to "/" we should be able to see 3738 * all mount-points from inside a jail. 3739 */ 3740 if (strcmp(pr->pr_path, "/") == 0) 3741 return; 3742 len = strlen(pr->pr_path); 3743 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3744 /* 3745 * Clear current buffer data, so we are sure nothing from 3746 * the valid path left there. 3747 */ 3748 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3749 if (*jpath == '\0') { 3750 /* Should never happen. */ 3751 *sp->f_mntonname = '/'; 3752 } else { 3753 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3754 } 3755 } 3756 3757 /* 3758 * Check with permission for a specific privilege is granted within jail. We 3759 * have a specific list of accepted privileges; the rest are denied. 3760 */ 3761 int 3762 prison_priv_check(struct ucred *cred, int priv) 3763 { 3764 3765 if (!jailed(cred)) 3766 return (0); 3767 3768 #ifdef VIMAGE 3769 /* 3770 * Privileges specific to prisons with a virtual network stack. 3771 * There might be a duplicate entry here in case the privilege 3772 * is only granted conditionally in the legacy jail case. 3773 */ 3774 switch (priv) { 3775 #ifdef notyet 3776 /* 3777 * NFS-specific privileges. 3778 */ 3779 case PRIV_NFS_DAEMON: 3780 case PRIV_NFS_LOCKD: 3781 #endif 3782 /* 3783 * Network stack privileges. 3784 */ 3785 case PRIV_NET_BRIDGE: 3786 case PRIV_NET_GRE: 3787 case PRIV_NET_BPF: 3788 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3789 case PRIV_NET_ROUTE: 3790 case PRIV_NET_TAP: 3791 case PRIV_NET_SETIFMTU: 3792 case PRIV_NET_SETIFFLAGS: 3793 case PRIV_NET_SETIFCAP: 3794 case PRIV_NET_SETIFDESCR: 3795 case PRIV_NET_SETIFNAME : 3796 case PRIV_NET_SETIFMETRIC: 3797 case PRIV_NET_SETIFPHYS: 3798 case PRIV_NET_SETIFMAC: 3799 case PRIV_NET_ADDMULTI: 3800 case PRIV_NET_DELMULTI: 3801 case PRIV_NET_HWIOCTL: 3802 case PRIV_NET_SETLLADDR: 3803 case PRIV_NET_ADDIFGROUP: 3804 case PRIV_NET_DELIFGROUP: 3805 case PRIV_NET_IFCREATE: 3806 case PRIV_NET_IFDESTROY: 3807 case PRIV_NET_ADDIFADDR: 3808 case PRIV_NET_DELIFADDR: 3809 case PRIV_NET_LAGG: 3810 case PRIV_NET_GIF: 3811 case PRIV_NET_SETIFVNET: 3812 case PRIV_NET_SETIFFIB: 3813 3814 /* 3815 * 802.11-related privileges. 3816 */ 3817 case PRIV_NET80211_GETKEY: 3818 #ifdef notyet 3819 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3820 #endif 3821 3822 #ifdef notyet 3823 /* 3824 * ATM privileges. 3825 */ 3826 case PRIV_NETATM_CFG: 3827 case PRIV_NETATM_ADD: 3828 case PRIV_NETATM_DEL: 3829 case PRIV_NETATM_SET: 3830 3831 /* 3832 * Bluetooth privileges. 3833 */ 3834 case PRIV_NETBLUETOOTH_RAW: 3835 #endif 3836 3837 /* 3838 * Netgraph and netgraph module privileges. 3839 */ 3840 case PRIV_NETGRAPH_CONTROL: 3841 #ifdef notyet 3842 case PRIV_NETGRAPH_TTY: 3843 #endif 3844 3845 /* 3846 * IPv4 and IPv6 privileges. 3847 */ 3848 case PRIV_NETINET_IPFW: 3849 case PRIV_NETINET_DIVERT: 3850 case PRIV_NETINET_PF: 3851 case PRIV_NETINET_DUMMYNET: 3852 case PRIV_NETINET_CARP: 3853 case PRIV_NETINET_MROUTE: 3854 case PRIV_NETINET_RAW: 3855 case PRIV_NETINET_ADDRCTRL6: 3856 case PRIV_NETINET_ND6: 3857 case PRIV_NETINET_SCOPE6: 3858 case PRIV_NETINET_ALIFETIME6: 3859 case PRIV_NETINET_IPSEC: 3860 case PRIV_NETINET_BINDANY: 3861 3862 #ifdef notyet 3863 /* 3864 * NCP privileges. 3865 */ 3866 case PRIV_NETNCP: 3867 3868 /* 3869 * SMB privileges. 3870 */ 3871 case PRIV_NETSMB: 3872 #endif 3873 3874 /* 3875 * No default: or deny here. 3876 * In case of no permit fall through to next switch(). 3877 */ 3878 if (cred->cr_prison->pr_flags & PR_VNET) 3879 return (0); 3880 } 3881 #endif /* VIMAGE */ 3882 3883 switch (priv) { 3884 3885 /* 3886 * Allow ktrace privileges for root in jail. 3887 */ 3888 case PRIV_KTRACE: 3889 3890 #if 0 3891 /* 3892 * Allow jailed processes to configure audit identity and 3893 * submit audit records (login, etc). In the future we may 3894 * want to further refine the relationship between audit and 3895 * jail. 3896 */ 3897 case PRIV_AUDIT_GETAUDIT: 3898 case PRIV_AUDIT_SETAUDIT: 3899 case PRIV_AUDIT_SUBMIT: 3900 #endif 3901 3902 /* 3903 * Allow jailed processes to manipulate process UNIX 3904 * credentials in any way they see fit. 3905 */ 3906 case PRIV_CRED_SETUID: 3907 case PRIV_CRED_SETEUID: 3908 case PRIV_CRED_SETGID: 3909 case PRIV_CRED_SETEGID: 3910 case PRIV_CRED_SETGROUPS: 3911 case PRIV_CRED_SETREUID: 3912 case PRIV_CRED_SETREGID: 3913 case PRIV_CRED_SETRESUID: 3914 case PRIV_CRED_SETRESGID: 3915 3916 /* 3917 * Jail implements visibility constraints already, so allow 3918 * jailed root to override uid/gid-based constraints. 3919 */ 3920 case PRIV_SEEOTHERGIDS: 3921 case PRIV_SEEOTHERUIDS: 3922 3923 /* 3924 * Jail implements inter-process debugging limits already, so 3925 * allow jailed root various debugging privileges. 3926 */ 3927 case PRIV_DEBUG_DIFFCRED: 3928 case PRIV_DEBUG_SUGID: 3929 case PRIV_DEBUG_UNPRIV: 3930 3931 /* 3932 * Allow jail to set various resource limits and login 3933 * properties, and for now, exceed process resource limits. 3934 */ 3935 case PRIV_PROC_LIMIT: 3936 case PRIV_PROC_SETLOGIN: 3937 case PRIV_PROC_SETRLIMIT: 3938 3939 /* 3940 * System V and POSIX IPC privileges are granted in jail. 3941 */ 3942 case PRIV_IPC_READ: 3943 case PRIV_IPC_WRITE: 3944 case PRIV_IPC_ADMIN: 3945 case PRIV_IPC_MSGSIZE: 3946 case PRIV_MQ_ADMIN: 3947 3948 /* 3949 * Jail operations within a jail work on child jails. 3950 */ 3951 case PRIV_JAIL_ATTACH: 3952 case PRIV_JAIL_SET: 3953 case PRIV_JAIL_REMOVE: 3954 3955 /* 3956 * Jail implements its own inter-process limits, so allow 3957 * root processes in jail to change scheduling on other 3958 * processes in the same jail. Likewise for signalling. 3959 */ 3960 case PRIV_SCHED_DIFFCRED: 3961 case PRIV_SCHED_CPUSET: 3962 case PRIV_SIGNAL_DIFFCRED: 3963 case PRIV_SIGNAL_SUGID: 3964 3965 /* 3966 * Allow jailed processes to write to sysctls marked as jail 3967 * writable. 3968 */ 3969 case PRIV_SYSCTL_WRITEJAIL: 3970 3971 /* 3972 * Allow root in jail to manage a variety of quota 3973 * properties. These should likely be conditional on a 3974 * configuration option. 3975 */ 3976 case PRIV_VFS_GETQUOTA: 3977 case PRIV_VFS_SETQUOTA: 3978 3979 /* 3980 * Since Jail relies on chroot() to implement file system 3981 * protections, grant many VFS privileges to root in jail. 3982 * Be careful to exclude mount-related and NFS-related 3983 * privileges. 3984 */ 3985 case PRIV_VFS_READ: 3986 case PRIV_VFS_WRITE: 3987 case PRIV_VFS_ADMIN: 3988 case PRIV_VFS_EXEC: 3989 case PRIV_VFS_LOOKUP: 3990 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3991 case PRIV_VFS_CHFLAGS_DEV: 3992 case PRIV_VFS_CHOWN: 3993 case PRIV_VFS_CHROOT: 3994 case PRIV_VFS_RETAINSUGID: 3995 case PRIV_VFS_FCHROOT: 3996 case PRIV_VFS_LINK: 3997 case PRIV_VFS_SETGID: 3998 case PRIV_VFS_STAT: 3999 case PRIV_VFS_STICKYFILE: 4000 4001 /* 4002 * As in the non-jail case, non-root users are expected to be 4003 * able to read kernel/phyiscal memory (provided /dev/[k]mem 4004 * exists in the jail and they have permission to access it). 4005 */ 4006 case PRIV_KMEM_READ: 4007 return (0); 4008 4009 /* 4010 * Depending on the global setting, allow privilege of 4011 * setting system flags. 4012 */ 4013 case PRIV_VFS_SYSFLAGS: 4014 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 4015 return (0); 4016 else 4017 return (EPERM); 4018 4019 /* 4020 * Depending on the global setting, allow privilege of 4021 * mounting/unmounting file systems. 4022 */ 4023 case PRIV_VFS_MOUNT: 4024 case PRIV_VFS_UNMOUNT: 4025 case PRIV_VFS_MOUNT_NONUSER: 4026 case PRIV_VFS_MOUNT_OWNER: 4027 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 4028 cred->cr_prison->pr_enforce_statfs < 2) 4029 return (0); 4030 else 4031 return (EPERM); 4032 4033 /* 4034 * Allow jailed root to bind reserved ports and reuse in-use 4035 * ports. 4036 */ 4037 case PRIV_NETINET_RESERVEDPORT: 4038 case PRIV_NETINET_REUSEPORT: 4039 return (0); 4040 4041 /* 4042 * Allow jailed root to set certain IPv4/6 (option) headers. 4043 */ 4044 case PRIV_NETINET_SETHDROPTS: 4045 return (0); 4046 4047 /* 4048 * Conditionally allow creating raw sockets in jail. 4049 */ 4050 case PRIV_NETINET_RAW: 4051 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 4052 return (0); 4053 else 4054 return (EPERM); 4055 4056 /* 4057 * Since jail implements its own visibility limits on netstat 4058 * sysctls, allow getcred. This allows identd to work in 4059 * jail. 4060 */ 4061 case PRIV_NETINET_GETCRED: 4062 return (0); 4063 4064 /* 4065 * Allow jailed root to set loginclass. 4066 */ 4067 case PRIV_PROC_SETLOGINCLASS: 4068 return (0); 4069 4070 default: 4071 /* 4072 * In all remaining cases, deny the privilege request. This 4073 * includes almost all network privileges, many system 4074 * configuration privileges. 4075 */ 4076 return (EPERM); 4077 } 4078 } 4079 4080 /* 4081 * Return the part of pr2's name that is relative to pr1, or the whole name 4082 * if it does not directly follow. 4083 */ 4084 4085 char * 4086 prison_name(struct prison *pr1, struct prison *pr2) 4087 { 4088 char *name; 4089 4090 /* Jails see themselves as "0" (if they see themselves at all). */ 4091 if (pr1 == pr2) 4092 return "0"; 4093 name = pr2->pr_name; 4094 if (prison_ischild(pr1, pr2)) { 4095 /* 4096 * pr1 isn't locked (and allprison_lock may not be either) 4097 * so its length can't be counted on. But the number of dots 4098 * can be counted on - and counted. 4099 */ 4100 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 4101 name = strchr(name, '.') + 1; 4102 } 4103 return (name); 4104 } 4105 4106 /* 4107 * Return the part of pr2's path that is relative to pr1, or the whole path 4108 * if it does not directly follow. 4109 */ 4110 static char * 4111 prison_path(struct prison *pr1, struct prison *pr2) 4112 { 4113 char *path1, *path2; 4114 int len1; 4115 4116 path1 = pr1->pr_path; 4117 path2 = pr2->pr_path; 4118 if (!strcmp(path1, "/")) 4119 return (path2); 4120 len1 = strlen(path1); 4121 if (strncmp(path1, path2, len1)) 4122 return (path2); 4123 if (path2[len1] == '\0') 4124 return "/"; 4125 if (path2[len1] == '/') 4126 return (path2 + len1); 4127 return (path2); 4128 } 4129 4130 4131 /* 4132 * Jail-related sysctls. 4133 */ 4134 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 4135 "Jails"); 4136 4137 static int 4138 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4139 { 4140 struct xprison *xp; 4141 struct prison *pr, *cpr; 4142 #ifdef INET 4143 struct in_addr *ip4 = NULL; 4144 int ip4s = 0; 4145 #endif 4146 #ifdef INET6 4147 struct in6_addr *ip6 = NULL; 4148 int ip6s = 0; 4149 #endif 4150 int descend, error; 4151 4152 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4153 pr = req->td->td_ucred->cr_prison; 4154 error = 0; 4155 sx_slock(&allprison_lock); 4156 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4157 #if defined(INET) || defined(INET6) 4158 again: 4159 #endif 4160 mtx_lock(&cpr->pr_mtx); 4161 #ifdef INET 4162 if (cpr->pr_ip4s > 0) { 4163 if (ip4s < cpr->pr_ip4s) { 4164 ip4s = cpr->pr_ip4s; 4165 mtx_unlock(&cpr->pr_mtx); 4166 ip4 = realloc(ip4, ip4s * 4167 sizeof(struct in_addr), M_TEMP, M_WAITOK); 4168 goto again; 4169 } 4170 bcopy(cpr->pr_ip4, ip4, 4171 cpr->pr_ip4s * sizeof(struct in_addr)); 4172 } 4173 #endif 4174 #ifdef INET6 4175 if (cpr->pr_ip6s > 0) { 4176 if (ip6s < cpr->pr_ip6s) { 4177 ip6s = cpr->pr_ip6s; 4178 mtx_unlock(&cpr->pr_mtx); 4179 ip6 = realloc(ip6, ip6s * 4180 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 4181 goto again; 4182 } 4183 bcopy(cpr->pr_ip6, ip6, 4184 cpr->pr_ip6s * sizeof(struct in6_addr)); 4185 } 4186 #endif 4187 if (cpr->pr_ref == 0) { 4188 mtx_unlock(&cpr->pr_mtx); 4189 continue; 4190 } 4191 bzero(xp, sizeof(*xp)); 4192 xp->pr_version = XPRISON_VERSION; 4193 xp->pr_id = cpr->pr_id; 4194 xp->pr_state = cpr->pr_uref > 0 4195 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4196 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4197 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4198 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4199 #ifdef INET 4200 xp->pr_ip4s = cpr->pr_ip4s; 4201 #endif 4202 #ifdef INET6 4203 xp->pr_ip6s = cpr->pr_ip6s; 4204 #endif 4205 mtx_unlock(&cpr->pr_mtx); 4206 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4207 if (error) 4208 break; 4209 #ifdef INET 4210 if (xp->pr_ip4s > 0) { 4211 error = SYSCTL_OUT(req, ip4, 4212 xp->pr_ip4s * sizeof(struct in_addr)); 4213 if (error) 4214 break; 4215 } 4216 #endif 4217 #ifdef INET6 4218 if (xp->pr_ip6s > 0) { 4219 error = SYSCTL_OUT(req, ip6, 4220 xp->pr_ip6s * sizeof(struct in6_addr)); 4221 if (error) 4222 break; 4223 } 4224 #endif 4225 } 4226 sx_sunlock(&allprison_lock); 4227 free(xp, M_TEMP); 4228 #ifdef INET 4229 free(ip4, M_TEMP); 4230 #endif 4231 #ifdef INET6 4232 free(ip6, M_TEMP); 4233 #endif 4234 return (error); 4235 } 4236 4237 SYSCTL_OID(_security_jail, OID_AUTO, list, 4238 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4239 sysctl_jail_list, "S", "List of active jails"); 4240 4241 static int 4242 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4243 { 4244 int error, injail; 4245 4246 injail = jailed(req->td->td_ucred); 4247 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4248 4249 return (error); 4250 } 4251 4252 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4253 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4254 sysctl_jail_jailed, "I", "Process in jail?"); 4255 4256 static int 4257 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4258 { 4259 int error, havevnet; 4260 #ifdef VIMAGE 4261 struct ucred *cred = req->td->td_ucred; 4262 4263 havevnet = jailed(cred) && prison_owns_vnet(cred); 4264 #else 4265 havevnet = 0; 4266 #endif 4267 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4268 4269 return (error); 4270 } 4271 4272 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4273 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4274 sysctl_jail_vnet, "I", "Jail owns VNET?"); 4275 4276 #if defined(INET) || defined(INET6) 4277 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4278 &jail_max_af_ips, 0, 4279 "Number of IP addresses a jail may have at most per address family"); 4280 #endif 4281 4282 /* 4283 * Default parameters for jail(2) compatibility. For historical reasons, 4284 * the sysctl names have varying similarity to the parameter names. Prisons 4285 * just see their own parameters, and can't change them. 4286 */ 4287 static int 4288 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4289 { 4290 struct prison *pr; 4291 int allow, error, i; 4292 4293 pr = req->td->td_ucred->cr_prison; 4294 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4295 4296 /* Get the current flag value, and convert it to a boolean. */ 4297 i = (allow & arg2) ? 1 : 0; 4298 if (arg1 != NULL) 4299 i = !i; 4300 error = sysctl_handle_int(oidp, &i, 0, req); 4301 if (error || !req->newptr) 4302 return (error); 4303 i = i ? arg2 : 0; 4304 if (arg1 != NULL) 4305 i ^= arg2; 4306 /* 4307 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4308 * for writing. 4309 */ 4310 mtx_lock(&prison0.pr_mtx); 4311 jail_default_allow = (jail_default_allow & ~arg2) | i; 4312 mtx_unlock(&prison0.pr_mtx); 4313 return (0); 4314 } 4315 4316 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4317 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4318 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4319 "Processes in jail can set their hostnames"); 4320 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4321 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4322 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4323 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 4324 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4325 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4326 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4327 "Processes in jail can use System V IPC primitives"); 4328 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4329 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4330 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4331 "Prison root can create raw sockets"); 4332 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4333 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4334 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4335 "Processes in jail can alter system file flags"); 4336 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4337 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4338 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4339 "Processes in jail can mount/unmount jail-friendly file systems"); 4340 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 4341 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4342 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 4343 "Processes in jail can mount the devfs file system"); 4344 SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed, 4345 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4346 NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I", 4347 "Processes in jail can mount the fdescfs file system"); 4348 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 4349 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4350 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 4351 "Processes in jail can mount the nullfs file system"); 4352 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 4353 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4354 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 4355 "Processes in jail can mount the procfs file system"); 4356 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linprocfs_allowed, 4357 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4358 NULL, PR_ALLOW_MOUNT_LINPROCFS, sysctl_jail_default_allow, "I", 4359 "Processes in jail can mount the linprocfs file system"); 4360 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linsysfs_allowed, 4361 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4362 NULL, PR_ALLOW_MOUNT_LINSYSFS, sysctl_jail_default_allow, "I", 4363 "Processes in jail can mount the linsysfs file system"); 4364 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed, 4365 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4366 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I", 4367 "Processes in jail can mount the tmpfs file system"); 4368 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 4369 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4370 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 4371 "Processes in jail can mount the zfs file system"); 4372 4373 static int 4374 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4375 { 4376 struct prison *pr; 4377 int level, error; 4378 4379 pr = req->td->td_ucred->cr_prison; 4380 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4381 error = sysctl_handle_int(oidp, &level, 0, req); 4382 if (error || !req->newptr) 4383 return (error); 4384 *(int *)arg1 = level; 4385 return (0); 4386 } 4387 4388 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4389 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4390 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4391 sysctl_jail_default_level, "I", 4392 "Processes in jail cannot see all mounted file systems"); 4393 4394 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4395 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4396 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4397 sysctl_jail_default_level, "I", 4398 "Ruleset for the devfs filesystem in jail"); 4399 4400 /* 4401 * Nodes to describe jail parameters. Maximum length of string parameters 4402 * is returned in the string itself, and the other parameters exist merely 4403 * to make themselves and their types known. 4404 */ 4405 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4406 "Jail parameters"); 4407 4408 int 4409 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4410 { 4411 int i; 4412 long l; 4413 size_t s; 4414 char numbuf[12]; 4415 4416 switch (oidp->oid_kind & CTLTYPE) 4417 { 4418 case CTLTYPE_LONG: 4419 case CTLTYPE_ULONG: 4420 l = 0; 4421 #ifdef SCTL_MASK32 4422 if (!(req->flags & SCTL_MASK32)) 4423 #endif 4424 return (SYSCTL_OUT(req, &l, sizeof(l))); 4425 case CTLTYPE_INT: 4426 case CTLTYPE_UINT: 4427 i = 0; 4428 return (SYSCTL_OUT(req, &i, sizeof(i))); 4429 case CTLTYPE_STRING: 4430 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4431 return 4432 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4433 case CTLTYPE_STRUCT: 4434 s = (size_t)arg2; 4435 return (SYSCTL_OUT(req, &s, sizeof(s))); 4436 } 4437 return (0); 4438 } 4439 4440 /* 4441 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 4442 * jail creation time but cannot be changed in an existing jail. 4443 */ 4444 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4445 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4446 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4447 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4448 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4449 "I", "Jail secure level"); 4450 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 4451 "Jail value for kern.osreldate and uname -K"); 4452 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 4453 "Jail value for kern.osrelease and uname -r"); 4454 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4455 "I", "Jail cannot see all mounted file systems"); 4456 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4457 "I", "Ruleset for in-jail devfs mounts"); 4458 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4459 "B", "Jail persistence"); 4460 #ifdef VIMAGE 4461 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4462 "E,jailsys", "Virtual network stack"); 4463 #endif 4464 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4465 "B", "Jail is in the process of shutting down"); 4466 4467 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4468 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4469 "I", "Current number of child jails"); 4470 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4471 "I", "Maximum number of child jails"); 4472 4473 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4474 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4475 "Jail hostname"); 4476 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4477 "Jail NIS domainname"); 4478 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4479 "Jail host UUID"); 4480 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4481 "LU", "Jail host ID"); 4482 4483 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4484 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4485 4486 #ifdef INET 4487 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4488 "Jail IPv4 address virtualization"); 4489 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4490 "S,in_addr,a", "Jail IPv4 addresses"); 4491 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4492 "B", "Do (not) use IPv4 source address selection rather than the " 4493 "primary jail IPv4 address."); 4494 #endif 4495 #ifdef INET6 4496 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4497 "Jail IPv6 address virtualization"); 4498 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4499 "S,in6_addr,a", "Jail IPv6 addresses"); 4500 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4501 "B", "Do (not) use IPv6 source address selection rather than the " 4502 "primary jail IPv6 address."); 4503 #endif 4504 4505 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4506 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4507 "B", "Jail may set hostname"); 4508 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4509 "B", "Jail may use SYSV IPC"); 4510 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4511 "B", "Jail may create raw sockets"); 4512 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4513 "B", "Jail may alter system file flags"); 4514 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4515 "B", "Jail may set file quotas"); 4516 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4517 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4518 4519 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4520 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4521 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4522 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 4523 "B", "Jail may mount the devfs file system"); 4524 SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW, 4525 "B", "Jail may mount the fdescfs file system"); 4526 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 4527 "B", "Jail may mount the nullfs file system"); 4528 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 4529 "B", "Jail may mount the procfs file system"); 4530 SYSCTL_JAIL_PARAM(_allow_mount, linprocfs, CTLTYPE_INT | CTLFLAG_RW, 4531 "B", "Jail may mount the linprocfs file system"); 4532 SYSCTL_JAIL_PARAM(_allow_mount, linsysfs, CTLTYPE_INT | CTLFLAG_RW, 4533 "B", "Jail may mount the linsysfs file system"); 4534 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW, 4535 "B", "Jail may mount the tmpfs file system"); 4536 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 4537 "B", "Jail may mount the zfs file system"); 4538 4539 #ifdef RACCT 4540 void 4541 prison_racct_foreach(void (*callback)(struct racct *racct, 4542 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 4543 void *arg2, void *arg3) 4544 { 4545 struct prison_racct *prr; 4546 4547 ASSERT_RACCT_ENABLED(); 4548 4549 sx_slock(&allprison_lock); 4550 if (pre != NULL) 4551 (pre)(); 4552 LIST_FOREACH(prr, &allprison_racct, prr_next) 4553 (callback)(prr->prr_racct, arg2, arg3); 4554 if (post != NULL) 4555 (post)(); 4556 sx_sunlock(&allprison_lock); 4557 } 4558 4559 static struct prison_racct * 4560 prison_racct_find_locked(const char *name) 4561 { 4562 struct prison_racct *prr; 4563 4564 ASSERT_RACCT_ENABLED(); 4565 sx_assert(&allprison_lock, SA_XLOCKED); 4566 4567 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4568 return (NULL); 4569 4570 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4571 if (strcmp(name, prr->prr_name) != 0) 4572 continue; 4573 4574 /* Found prison_racct with a matching name? */ 4575 prison_racct_hold(prr); 4576 return (prr); 4577 } 4578 4579 /* Add new prison_racct. */ 4580 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4581 racct_create(&prr->prr_racct); 4582 4583 strcpy(prr->prr_name, name); 4584 refcount_init(&prr->prr_refcount, 1); 4585 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4586 4587 return (prr); 4588 } 4589 4590 struct prison_racct * 4591 prison_racct_find(const char *name) 4592 { 4593 struct prison_racct *prr; 4594 4595 ASSERT_RACCT_ENABLED(); 4596 4597 sx_xlock(&allprison_lock); 4598 prr = prison_racct_find_locked(name); 4599 sx_xunlock(&allprison_lock); 4600 return (prr); 4601 } 4602 4603 void 4604 prison_racct_hold(struct prison_racct *prr) 4605 { 4606 4607 ASSERT_RACCT_ENABLED(); 4608 4609 refcount_acquire(&prr->prr_refcount); 4610 } 4611 4612 static void 4613 prison_racct_free_locked(struct prison_racct *prr) 4614 { 4615 4616 ASSERT_RACCT_ENABLED(); 4617 sx_assert(&allprison_lock, SA_XLOCKED); 4618 4619 if (refcount_release(&prr->prr_refcount)) { 4620 racct_destroy(&prr->prr_racct); 4621 LIST_REMOVE(prr, prr_next); 4622 free(prr, M_PRISON_RACCT); 4623 } 4624 } 4625 4626 void 4627 prison_racct_free(struct prison_racct *prr) 4628 { 4629 int old; 4630 4631 ASSERT_RACCT_ENABLED(); 4632 sx_assert(&allprison_lock, SA_UNLOCKED); 4633 4634 old = prr->prr_refcount; 4635 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4636 return; 4637 4638 sx_xlock(&allprison_lock); 4639 prison_racct_free_locked(prr); 4640 sx_xunlock(&allprison_lock); 4641 } 4642 4643 static void 4644 prison_racct_attach(struct prison *pr) 4645 { 4646 struct prison_racct *prr; 4647 4648 ASSERT_RACCT_ENABLED(); 4649 sx_assert(&allprison_lock, SA_XLOCKED); 4650 4651 prr = prison_racct_find_locked(pr->pr_name); 4652 KASSERT(prr != NULL, ("cannot find prison_racct")); 4653 4654 pr->pr_prison_racct = prr; 4655 } 4656 4657 /* 4658 * Handle jail renaming. From the racct point of view, renaming means 4659 * moving from one prison_racct to another. 4660 */ 4661 static void 4662 prison_racct_modify(struct prison *pr) 4663 { 4664 struct proc *p; 4665 struct ucred *cred; 4666 struct prison_racct *oldprr; 4667 4668 ASSERT_RACCT_ENABLED(); 4669 4670 sx_slock(&allproc_lock); 4671 sx_xlock(&allprison_lock); 4672 4673 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4674 sx_xunlock(&allprison_lock); 4675 sx_sunlock(&allproc_lock); 4676 return; 4677 } 4678 4679 oldprr = pr->pr_prison_racct; 4680 pr->pr_prison_racct = NULL; 4681 4682 prison_racct_attach(pr); 4683 4684 /* 4685 * Move resource utilisation records. 4686 */ 4687 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4688 4689 /* 4690 * Force rctl to reattach rules to processes. 4691 */ 4692 FOREACH_PROC_IN_SYSTEM(p) { 4693 PROC_LOCK(p); 4694 cred = crhold(p->p_ucred); 4695 PROC_UNLOCK(p); 4696 racct_proc_ucred_changed(p, cred, cred); 4697 crfree(cred); 4698 } 4699 4700 sx_sunlock(&allproc_lock); 4701 prison_racct_free_locked(oldprr); 4702 sx_xunlock(&allprison_lock); 4703 } 4704 4705 static void 4706 prison_racct_detach(struct prison *pr) 4707 { 4708 4709 ASSERT_RACCT_ENABLED(); 4710 sx_assert(&allprison_lock, SA_UNLOCKED); 4711 4712 if (pr->pr_prison_racct == NULL) 4713 return; 4714 prison_racct_free(pr->pr_prison_racct); 4715 pr->pr_prison_racct = NULL; 4716 } 4717 #endif /* RACCT */ 4718 4719 #ifdef DDB 4720 4721 static void 4722 db_show_prison(struct prison *pr) 4723 { 4724 int fi; 4725 #if defined(INET) || defined(INET6) 4726 int ii; 4727 #endif 4728 unsigned jsf; 4729 #ifdef INET6 4730 char ip6buf[INET6_ADDRSTRLEN]; 4731 #endif 4732 4733 db_printf("prison %p:\n", pr); 4734 db_printf(" jid = %d\n", pr->pr_id); 4735 db_printf(" name = %s\n", pr->pr_name); 4736 db_printf(" parent = %p\n", pr->pr_parent); 4737 db_printf(" ref = %d\n", pr->pr_ref); 4738 db_printf(" uref = %d\n", pr->pr_uref); 4739 db_printf(" path = %s\n", pr->pr_path); 4740 db_printf(" cpuset = %d\n", pr->pr_cpuset 4741 ? pr->pr_cpuset->cs_id : -1); 4742 #ifdef VIMAGE 4743 db_printf(" vnet = %p\n", pr->pr_vnet); 4744 #endif 4745 db_printf(" root = %p\n", pr->pr_root); 4746 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4747 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4748 db_printf(" children.max = %d\n", pr->pr_childmax); 4749 db_printf(" children.cur = %d\n", pr->pr_childcount); 4750 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4751 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4752 db_printf(" flags = 0x%x", pr->pr_flags); 4753 for (fi = 0; fi < nitems(pr_flag_names); fi++) 4754 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4755 db_printf(" %s", pr_flag_names[fi]); 4756 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) { 4757 jsf = pr->pr_flags & 4758 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4759 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4760 pr_flag_jailsys[fi].disable && 4761 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4762 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4763 : "inherit"); 4764 } 4765 db_printf(" allow = 0x%x", pr->pr_allow); 4766 for (fi = 0; fi < nitems(pr_allow_names); fi++) 4767 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4768 db_printf(" %s", pr_allow_names[fi]); 4769 db_printf("\n"); 4770 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4771 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4772 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4773 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4774 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4775 #ifdef INET 4776 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4777 for (ii = 0; ii < pr->pr_ip4s; ii++) 4778 db_printf(" %s %s\n", 4779 ii == 0 ? "ip4.addr =" : " ", 4780 inet_ntoa(pr->pr_ip4[ii])); 4781 #endif 4782 #ifdef INET6 4783 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4784 for (ii = 0; ii < pr->pr_ip6s; ii++) 4785 db_printf(" %s %s\n", 4786 ii == 0 ? "ip6.addr =" : " ", 4787 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4788 #endif 4789 } 4790 4791 DB_SHOW_COMMAND(prison, db_show_prison_command) 4792 { 4793 struct prison *pr; 4794 4795 if (!have_addr) { 4796 /* 4797 * Show all prisons in the list, and prison0 which is not 4798 * listed. 4799 */ 4800 db_show_prison(&prison0); 4801 if (!db_pager_quit) { 4802 TAILQ_FOREACH(pr, &allprison, pr_list) { 4803 db_show_prison(pr); 4804 if (db_pager_quit) 4805 break; 4806 } 4807 } 4808 return; 4809 } 4810 4811 if (addr == 0) 4812 pr = &prison0; 4813 else { 4814 /* Look for a prison with the ID and with references. */ 4815 TAILQ_FOREACH(pr, &allprison, pr_list) 4816 if (pr->pr_id == addr && pr->pr_ref > 0) 4817 break; 4818 if (pr == NULL) 4819 /* Look again, without requiring a reference. */ 4820 TAILQ_FOREACH(pr, &allprison, pr_list) 4821 if (pr->pr_id == addr) 4822 break; 4823 if (pr == NULL) 4824 /* Assume address points to a valid prison. */ 4825 pr = (struct prison *)addr; 4826 } 4827 db_show_prison(pr); 4828 } 4829 4830 #endif /* DDB */ 4831