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