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/if_var.h> 66 #include <net/vnet.h> 67 68 #include <netinet/in.h> 69 70 #ifdef DDB 71 #include <ddb/ddb.h> 72 #ifdef INET6 73 #include <netinet6/in6_var.h> 74 #endif /* INET6 */ 75 #endif /* DDB */ 76 77 #include <security/mac/mac_framework.h> 78 79 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 80 81 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 82 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 83 84 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 85 #ifdef INET 86 #ifdef INET6 87 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 88 #else 89 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 90 #endif 91 #else /* !INET */ 92 #ifdef INET6 93 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 94 #else 95 #define _PR_IP_SADDRSEL 0 96 #endif 97 #endif 98 99 /* prison0 describes what is "real" about the system. */ 100 struct prison prison0 = { 101 .pr_id = 0, 102 .pr_name = "0", 103 .pr_ref = 1, 104 .pr_uref = 1, 105 .pr_path = "/", 106 .pr_securelevel = -1, 107 .pr_devfs_rsnum = 0, 108 .pr_childmax = JAIL_MAX, 109 .pr_hostuuid = DEFAULT_HOSTUUID, 110 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 111 #ifdef VIMAGE 112 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 113 #else 114 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 115 #endif 116 .pr_allow = PR_ALLOW_ALL, 117 }; 118 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 119 120 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 121 struct sx allprison_lock; 122 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 123 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 124 LIST_HEAD(, prison_racct) allprison_racct; 125 int lastprid = 0; 126 127 static int do_jail_attach(struct thread *td, struct prison *pr); 128 static void prison_complete(void *context, int pending); 129 static void prison_deref(struct prison *pr, int flags); 130 static char *prison_path(struct prison *pr1, struct prison *pr2); 131 static void prison_remove_one(struct prison *pr); 132 #ifdef RACCT 133 static void prison_racct_attach(struct prison *pr); 134 static void prison_racct_modify(struct prison *pr); 135 static void prison_racct_detach(struct prison *pr); 136 #endif 137 #ifdef INET 138 static int _prison_check_ip4(const struct prison *, const struct in_addr *); 139 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4); 140 #endif 141 #ifdef INET6 142 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6); 143 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6); 144 #endif 145 146 /* Flags for prison_deref */ 147 #define PD_DEREF 0x01 148 #define PD_DEUREF 0x02 149 #define PD_LOCKED 0x04 150 #define PD_LIST_SLOCKED 0x08 151 #define PD_LIST_XLOCKED 0x10 152 153 /* 154 * Parameter names corresponding to PR_* flag values. Size values are for kvm 155 * as we cannot figure out the size of a sparse array, or an array without a 156 * terminating entry. 157 */ 158 static char *pr_flag_names[] = { 159 [0] = "persist", 160 #ifdef INET 161 [7] = "ip4.saddrsel", 162 #endif 163 #ifdef INET6 164 [8] = "ip6.saddrsel", 165 #endif 166 }; 167 const size_t pr_flag_names_size = sizeof(pr_flag_names); 168 169 static char *pr_flag_nonames[] = { 170 [0] = "nopersist", 171 #ifdef INET 172 [7] = "ip4.nosaddrsel", 173 #endif 174 #ifdef INET6 175 [8] = "ip6.nosaddrsel", 176 #endif 177 }; 178 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames); 179 180 struct jailsys_flags { 181 const char *name; 182 unsigned disable; 183 unsigned new; 184 } pr_flag_jailsys[] = { 185 { "host", 0, PR_HOST }, 186 #ifdef VIMAGE 187 { "vnet", 0, PR_VNET }, 188 #endif 189 #ifdef INET 190 { "ip4", PR_IP4_USER, PR_IP4_USER }, 191 #endif 192 #ifdef INET6 193 { "ip6", PR_IP6_USER, PR_IP6_USER }, 194 #endif 195 }; 196 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 197 198 static char *pr_allow_names[] = { 199 "allow.set_hostname", 200 "allow.sysvipc", 201 "allow.raw_sockets", 202 "allow.chflags", 203 "allow.mount", 204 "allow.quotas", 205 "allow.socket_af", 206 "allow.mount.devfs", 207 "allow.mount.nullfs", 208 "allow.mount.zfs", 209 "allow.mount.procfs", 210 "allow.mount.tmpfs", 211 "allow.mount.fdescfs", 212 }; 213 const size_t pr_allow_names_size = sizeof(pr_allow_names); 214 215 static char *pr_allow_nonames[] = { 216 "allow.noset_hostname", 217 "allow.nosysvipc", 218 "allow.noraw_sockets", 219 "allow.nochflags", 220 "allow.nomount", 221 "allow.noquotas", 222 "allow.nosocket_af", 223 "allow.mount.nodevfs", 224 "allow.mount.nonullfs", 225 "allow.mount.nozfs", 226 "allow.mount.noprocfs", 227 "allow.mount.notmpfs", 228 "allow.mount.nofdescfs", 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 (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 (!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 2184 /* Get the module parameters. */ 2185 mtx_unlock(&pr->pr_mtx); 2186 locked = 0; 2187 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2188 if (error) 2189 goto done_deref; 2190 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2191 2192 /* By now, all parameters should have been noted. */ 2193 TAILQ_FOREACH(opt, opts, link) { 2194 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2195 error = EINVAL; 2196 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2197 goto done_errmsg; 2198 } 2199 } 2200 2201 /* Write the fetched parameters back to userspace. */ 2202 error = 0; 2203 TAILQ_FOREACH(opt, opts, link) { 2204 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2205 pos = 2 * opt->pos + 1; 2206 optuio->uio_iov[pos].iov_len = opt->len; 2207 if (opt->value != NULL) { 2208 if (optuio->uio_segflg == UIO_SYSSPACE) { 2209 bcopy(opt->value, 2210 optuio->uio_iov[pos].iov_base, 2211 opt->len); 2212 } else { 2213 error = copyout(opt->value, 2214 optuio->uio_iov[pos].iov_base, 2215 opt->len); 2216 if (error) 2217 break; 2218 } 2219 } 2220 } 2221 } 2222 goto done_errmsg; 2223 2224 done_deref: 2225 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2226 goto done_errmsg; 2227 2228 done_unlock_list: 2229 sx_sunlock(&allprison_lock); 2230 done_errmsg: 2231 if (error && errmsg_pos >= 0) { 2232 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2233 errmsg_pos = 2 * errmsg_pos + 1; 2234 if (errmsg_len > 0) { 2235 if (optuio->uio_segflg == UIO_SYSSPACE) 2236 bcopy(errmsg, 2237 optuio->uio_iov[errmsg_pos].iov_base, 2238 errmsg_len); 2239 else 2240 copyout(errmsg, 2241 optuio->uio_iov[errmsg_pos].iov_base, 2242 errmsg_len); 2243 } 2244 } 2245 vfs_freeopts(opts); 2246 return (error); 2247 } 2248 2249 2250 /* 2251 * struct jail_remove_args { 2252 * int jid; 2253 * }; 2254 */ 2255 int 2256 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2257 { 2258 struct prison *pr, *cpr, *lpr, *tpr; 2259 int descend, error; 2260 2261 error = priv_check(td, PRIV_JAIL_REMOVE); 2262 if (error) 2263 return (error); 2264 2265 sx_xlock(&allprison_lock); 2266 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2267 if (pr == NULL) { 2268 sx_xunlock(&allprison_lock); 2269 return (EINVAL); 2270 } 2271 2272 /* Remove all descendants of this prison, then remove this prison. */ 2273 pr->pr_ref++; 2274 pr->pr_flags |= PR_REMOVE; 2275 if (!LIST_EMPTY(&pr->pr_children)) { 2276 mtx_unlock(&pr->pr_mtx); 2277 lpr = NULL; 2278 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2279 mtx_lock(&cpr->pr_mtx); 2280 if (cpr->pr_ref > 0) { 2281 tpr = cpr; 2282 cpr->pr_ref++; 2283 cpr->pr_flags |= PR_REMOVE; 2284 } else { 2285 /* Already removed - do not do it again. */ 2286 tpr = NULL; 2287 } 2288 mtx_unlock(&cpr->pr_mtx); 2289 if (lpr != NULL) { 2290 mtx_lock(&lpr->pr_mtx); 2291 prison_remove_one(lpr); 2292 sx_xlock(&allprison_lock); 2293 } 2294 lpr = tpr; 2295 } 2296 if (lpr != NULL) { 2297 mtx_lock(&lpr->pr_mtx); 2298 prison_remove_one(lpr); 2299 sx_xlock(&allprison_lock); 2300 } 2301 mtx_lock(&pr->pr_mtx); 2302 } 2303 prison_remove_one(pr); 2304 return (0); 2305 } 2306 2307 static void 2308 prison_remove_one(struct prison *pr) 2309 { 2310 struct proc *p; 2311 int deuref; 2312 2313 /* If the prison was persistent, it is not anymore. */ 2314 deuref = 0; 2315 if (pr->pr_flags & PR_PERSIST) { 2316 pr->pr_ref--; 2317 deuref = PD_DEUREF; 2318 pr->pr_flags &= ~PR_PERSIST; 2319 } 2320 2321 /* 2322 * jail_remove added a reference. If that's the only one, remove 2323 * the prison now. 2324 */ 2325 KASSERT(pr->pr_ref > 0, 2326 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2327 if (pr->pr_ref == 1) { 2328 prison_deref(pr, 2329 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2330 return; 2331 } 2332 2333 mtx_unlock(&pr->pr_mtx); 2334 sx_xunlock(&allprison_lock); 2335 /* 2336 * Kill all processes unfortunate enough to be attached to this prison. 2337 */ 2338 sx_slock(&allproc_lock); 2339 LIST_FOREACH(p, &allproc, p_list) { 2340 PROC_LOCK(p); 2341 if (p->p_state != PRS_NEW && p->p_ucred && 2342 p->p_ucred->cr_prison == pr) 2343 kern_psignal(p, SIGKILL); 2344 PROC_UNLOCK(p); 2345 } 2346 sx_sunlock(&allproc_lock); 2347 /* Remove the temporary reference added by jail_remove. */ 2348 prison_deref(pr, deuref | PD_DEREF); 2349 } 2350 2351 2352 /* 2353 * struct jail_attach_args { 2354 * int jid; 2355 * }; 2356 */ 2357 int 2358 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2359 { 2360 struct prison *pr; 2361 int error; 2362 2363 error = priv_check(td, PRIV_JAIL_ATTACH); 2364 if (error) 2365 return (error); 2366 2367 sx_slock(&allprison_lock); 2368 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2369 if (pr == NULL) { 2370 sx_sunlock(&allprison_lock); 2371 return (EINVAL); 2372 } 2373 2374 /* 2375 * Do not allow a process to attach to a prison that is not 2376 * considered to be "alive". 2377 */ 2378 if (pr->pr_uref == 0) { 2379 mtx_unlock(&pr->pr_mtx); 2380 sx_sunlock(&allprison_lock); 2381 return (EINVAL); 2382 } 2383 2384 return (do_jail_attach(td, pr)); 2385 } 2386 2387 static int 2388 do_jail_attach(struct thread *td, struct prison *pr) 2389 { 2390 struct prison *ppr; 2391 struct proc *p; 2392 struct ucred *newcred, *oldcred; 2393 int error; 2394 2395 /* 2396 * XXX: Note that there is a slight race here if two threads 2397 * in the same privileged process attempt to attach to two 2398 * different jails at the same time. It is important for 2399 * user processes not to do this, or they might end up with 2400 * a process root from one prison, but attached to the jail 2401 * of another. 2402 */ 2403 pr->pr_ref++; 2404 pr->pr_uref++; 2405 mtx_unlock(&pr->pr_mtx); 2406 2407 /* Let modules do whatever they need to prepare for attaching. */ 2408 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2409 if (error) { 2410 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2411 return (error); 2412 } 2413 sx_sunlock(&allprison_lock); 2414 2415 /* 2416 * Reparent the newly attached process to this jail. 2417 */ 2418 ppr = td->td_ucred->cr_prison; 2419 p = td->td_proc; 2420 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2421 if (error) 2422 goto e_revert_osd; 2423 2424 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2425 if ((error = change_dir(pr->pr_root, td)) != 0) 2426 goto e_unlock; 2427 #ifdef MAC 2428 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2429 goto e_unlock; 2430 #endif 2431 VOP_UNLOCK(pr->pr_root, 0); 2432 if ((error = change_root(pr->pr_root, td))) 2433 goto e_revert_osd; 2434 2435 newcred = crget(); 2436 PROC_LOCK(p); 2437 oldcred = p->p_ucred; 2438 setsugid(p); 2439 crcopy(newcred, oldcred); 2440 newcred->cr_prison = pr; 2441 p->p_ucred = newcred; 2442 PROC_UNLOCK(p); 2443 #ifdef RACCT 2444 racct_proc_ucred_changed(p, oldcred, newcred); 2445 #endif 2446 crfree(oldcred); 2447 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2448 return (0); 2449 e_unlock: 2450 VOP_UNLOCK(pr->pr_root, 0); 2451 e_revert_osd: 2452 /* Tell modules this thread is still in its old jail after all. */ 2453 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2454 prison_deref(pr, PD_DEREF | PD_DEUREF); 2455 return (error); 2456 } 2457 2458 2459 /* 2460 * Returns a locked prison instance, or NULL on failure. 2461 */ 2462 struct prison * 2463 prison_find(int prid) 2464 { 2465 struct prison *pr; 2466 2467 sx_assert(&allprison_lock, SX_LOCKED); 2468 TAILQ_FOREACH(pr, &allprison, pr_list) { 2469 if (pr->pr_id == prid) { 2470 mtx_lock(&pr->pr_mtx); 2471 if (pr->pr_ref > 0) 2472 return (pr); 2473 mtx_unlock(&pr->pr_mtx); 2474 } 2475 } 2476 return (NULL); 2477 } 2478 2479 /* 2480 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2481 */ 2482 struct prison * 2483 prison_find_child(struct prison *mypr, int prid) 2484 { 2485 struct prison *pr; 2486 int descend; 2487 2488 sx_assert(&allprison_lock, SX_LOCKED); 2489 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2490 if (pr->pr_id == prid) { 2491 mtx_lock(&pr->pr_mtx); 2492 if (pr->pr_ref > 0) 2493 return (pr); 2494 mtx_unlock(&pr->pr_mtx); 2495 } 2496 } 2497 return (NULL); 2498 } 2499 2500 /* 2501 * Look for the name relative to mypr. Returns a locked prison or NULL. 2502 */ 2503 struct prison * 2504 prison_find_name(struct prison *mypr, const char *name) 2505 { 2506 struct prison *pr, *deadpr; 2507 size_t mylen; 2508 int descend; 2509 2510 sx_assert(&allprison_lock, SX_LOCKED); 2511 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2512 again: 2513 deadpr = NULL; 2514 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2515 if (!strcmp(pr->pr_name + mylen, name)) { 2516 mtx_lock(&pr->pr_mtx); 2517 if (pr->pr_ref > 0) { 2518 if (pr->pr_uref > 0) 2519 return (pr); 2520 deadpr = pr; 2521 } 2522 mtx_unlock(&pr->pr_mtx); 2523 } 2524 } 2525 /* There was no valid prison - perhaps there was a dying one. */ 2526 if (deadpr != NULL) { 2527 mtx_lock(&deadpr->pr_mtx); 2528 if (deadpr->pr_ref == 0) { 2529 mtx_unlock(&deadpr->pr_mtx); 2530 goto again; 2531 } 2532 } 2533 return (deadpr); 2534 } 2535 2536 /* 2537 * See if a prison has the specific flag set. 2538 */ 2539 int 2540 prison_flag(struct ucred *cred, unsigned flag) 2541 { 2542 2543 /* This is an atomic read, so no locking is necessary. */ 2544 return (cred->cr_prison->pr_flags & flag); 2545 } 2546 2547 int 2548 prison_allow(struct ucred *cred, unsigned flag) 2549 { 2550 2551 /* This is an atomic read, so no locking is necessary. */ 2552 return (cred->cr_prison->pr_allow & flag); 2553 } 2554 2555 /* 2556 * Remove a prison reference. If that was the last reference, remove the 2557 * prison itself - but not in this context in case there are locks held. 2558 */ 2559 void 2560 prison_free_locked(struct prison *pr) 2561 { 2562 2563 mtx_assert(&pr->pr_mtx, MA_OWNED); 2564 pr->pr_ref--; 2565 if (pr->pr_ref == 0) { 2566 mtx_unlock(&pr->pr_mtx); 2567 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2568 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2569 return; 2570 } 2571 mtx_unlock(&pr->pr_mtx); 2572 } 2573 2574 void 2575 prison_free(struct prison *pr) 2576 { 2577 2578 mtx_lock(&pr->pr_mtx); 2579 prison_free_locked(pr); 2580 } 2581 2582 static void 2583 prison_complete(void *context, int pending) 2584 { 2585 2586 prison_deref((struct prison *)context, 0); 2587 } 2588 2589 /* 2590 * Remove a prison reference (usually). This internal version assumes no 2591 * mutexes are held, except perhaps the prison itself. If there are no more 2592 * references, release and delist the prison. On completion, the prison lock 2593 * and the allprison lock are both unlocked. 2594 */ 2595 static void 2596 prison_deref(struct prison *pr, int flags) 2597 { 2598 struct prison *ppr, *tpr; 2599 2600 if (!(flags & PD_LOCKED)) 2601 mtx_lock(&pr->pr_mtx); 2602 for (;;) { 2603 if (flags & PD_DEUREF) { 2604 pr->pr_uref--; 2605 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2606 } 2607 if (flags & PD_DEREF) 2608 pr->pr_ref--; 2609 /* If the prison still has references, nothing else to do. */ 2610 if (pr->pr_ref > 0) { 2611 mtx_unlock(&pr->pr_mtx); 2612 if (flags & PD_LIST_SLOCKED) 2613 sx_sunlock(&allprison_lock); 2614 else if (flags & PD_LIST_XLOCKED) 2615 sx_xunlock(&allprison_lock); 2616 return; 2617 } 2618 2619 mtx_unlock(&pr->pr_mtx); 2620 if (flags & PD_LIST_SLOCKED) { 2621 if (!sx_try_upgrade(&allprison_lock)) { 2622 sx_sunlock(&allprison_lock); 2623 sx_xlock(&allprison_lock); 2624 } 2625 } else if (!(flags & PD_LIST_XLOCKED)) 2626 sx_xlock(&allprison_lock); 2627 2628 TAILQ_REMOVE(&allprison, pr, pr_list); 2629 LIST_REMOVE(pr, pr_sibling); 2630 ppr = pr->pr_parent; 2631 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2632 tpr->pr_childcount--; 2633 sx_xunlock(&allprison_lock); 2634 2635 #ifdef VIMAGE 2636 if (pr->pr_vnet != ppr->pr_vnet) 2637 vnet_destroy(pr->pr_vnet); 2638 #endif 2639 if (pr->pr_root != NULL) 2640 vrele(pr->pr_root); 2641 mtx_destroy(&pr->pr_mtx); 2642 #ifdef INET 2643 free(pr->pr_ip4, M_PRISON); 2644 #endif 2645 #ifdef INET6 2646 free(pr->pr_ip6, M_PRISON); 2647 #endif 2648 if (pr->pr_cpuset != NULL) 2649 cpuset_rel(pr->pr_cpuset); 2650 osd_jail_exit(pr); 2651 #ifdef RACCT 2652 prison_racct_detach(pr); 2653 #endif 2654 free(pr, M_PRISON); 2655 2656 /* Removing a prison frees a reference on its parent. */ 2657 pr = ppr; 2658 mtx_lock(&pr->pr_mtx); 2659 flags = PD_DEREF | PD_DEUREF; 2660 } 2661 } 2662 2663 void 2664 prison_hold_locked(struct prison *pr) 2665 { 2666 2667 mtx_assert(&pr->pr_mtx, MA_OWNED); 2668 KASSERT(pr->pr_ref > 0, 2669 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2670 pr->pr_ref++; 2671 } 2672 2673 void 2674 prison_hold(struct prison *pr) 2675 { 2676 2677 mtx_lock(&pr->pr_mtx); 2678 prison_hold_locked(pr); 2679 mtx_unlock(&pr->pr_mtx); 2680 } 2681 2682 void 2683 prison_proc_hold(struct prison *pr) 2684 { 2685 2686 mtx_lock(&pr->pr_mtx); 2687 KASSERT(pr->pr_uref > 0, 2688 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2689 pr->pr_uref++; 2690 mtx_unlock(&pr->pr_mtx); 2691 } 2692 2693 void 2694 prison_proc_free(struct prison *pr) 2695 { 2696 2697 mtx_lock(&pr->pr_mtx); 2698 KASSERT(pr->pr_uref > 0, 2699 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2700 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2701 } 2702 2703 2704 #ifdef INET 2705 /* 2706 * Restrict a prison's IP address list with its parent's, possibly replacing 2707 * it. Return true if the replacement buffer was used (or would have been). 2708 */ 2709 static int 2710 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2711 { 2712 int ii, ij, used; 2713 struct prison *ppr; 2714 2715 ppr = pr->pr_parent; 2716 if (!(pr->pr_flags & PR_IP4_USER)) { 2717 /* This has no user settings, so just copy the parent's list. */ 2718 if (pr->pr_ip4s < ppr->pr_ip4s) { 2719 /* 2720 * There's no room for the parent's list. Use the 2721 * new list buffer, which is assumed to be big enough 2722 * (if it was passed). If there's no buffer, try to 2723 * allocate one. 2724 */ 2725 used = 1; 2726 if (newip4 == NULL) { 2727 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2728 M_PRISON, M_NOWAIT); 2729 if (newip4 != NULL) 2730 used = 0; 2731 } 2732 if (newip4 != NULL) { 2733 bcopy(ppr->pr_ip4, newip4, 2734 ppr->pr_ip4s * sizeof(*newip4)); 2735 free(pr->pr_ip4, M_PRISON); 2736 pr->pr_ip4 = newip4; 2737 pr->pr_ip4s = ppr->pr_ip4s; 2738 } 2739 return (used); 2740 } 2741 pr->pr_ip4s = ppr->pr_ip4s; 2742 if (pr->pr_ip4s > 0) 2743 bcopy(ppr->pr_ip4, pr->pr_ip4, 2744 pr->pr_ip4s * sizeof(*newip4)); 2745 else if (pr->pr_ip4 != NULL) { 2746 free(pr->pr_ip4, M_PRISON); 2747 pr->pr_ip4 = NULL; 2748 } 2749 } else if (pr->pr_ip4s > 0) { 2750 /* Remove addresses that aren't in the parent. */ 2751 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2752 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2753 break; 2754 if (ij < ppr->pr_ip4s) 2755 ii = 1; 2756 else { 2757 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2758 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2759 ii = 0; 2760 } 2761 for (ij = 1; ii < pr->pr_ip4s; ) { 2762 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2763 ii++; 2764 continue; 2765 } 2766 switch (ij >= ppr->pr_ip4s ? -1 : 2767 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2768 case -1: 2769 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2770 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2771 break; 2772 case 0: 2773 ii++; 2774 ij++; 2775 break; 2776 case 1: 2777 ij++; 2778 break; 2779 } 2780 } 2781 if (pr->pr_ip4s == 0) { 2782 free(pr->pr_ip4, M_PRISON); 2783 pr->pr_ip4 = NULL; 2784 } 2785 } 2786 return (0); 2787 } 2788 2789 /* 2790 * Pass back primary IPv4 address of this jail. 2791 * 2792 * If not restricted return success but do not alter the address. Caller has 2793 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2794 * 2795 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2796 * Address returned in NBO. 2797 */ 2798 int 2799 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2800 { 2801 struct prison *pr; 2802 2803 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2804 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2805 2806 pr = cred->cr_prison; 2807 if (!(pr->pr_flags & PR_IP4)) 2808 return (0); 2809 mtx_lock(&pr->pr_mtx); 2810 if (!(pr->pr_flags & PR_IP4)) { 2811 mtx_unlock(&pr->pr_mtx); 2812 return (0); 2813 } 2814 if (pr->pr_ip4 == NULL) { 2815 mtx_unlock(&pr->pr_mtx); 2816 return (EAFNOSUPPORT); 2817 } 2818 2819 ia->s_addr = pr->pr_ip4[0].s_addr; 2820 mtx_unlock(&pr->pr_mtx); 2821 return (0); 2822 } 2823 2824 /* 2825 * Return 1 if we should do proper source address selection or are not jailed. 2826 * We will return 0 if we should bypass source address selection in favour 2827 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2828 * returned in NBO. 2829 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2830 */ 2831 int 2832 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2833 { 2834 struct prison *pr; 2835 struct in_addr lia; 2836 int error; 2837 2838 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2839 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2840 2841 if (!jailed(cred)) 2842 return (1); 2843 2844 pr = cred->cr_prison; 2845 if (pr->pr_flags & PR_IP4_SADDRSEL) 2846 return (1); 2847 2848 lia.s_addr = INADDR_ANY; 2849 error = prison_get_ip4(cred, &lia); 2850 if (error) 2851 return (error); 2852 if (lia.s_addr == INADDR_ANY) 2853 return (1); 2854 2855 ia->s_addr = lia.s_addr; 2856 return (0); 2857 } 2858 2859 /* 2860 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2861 */ 2862 int 2863 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2864 { 2865 2866 if (pr1 == pr2) 2867 return (1); 2868 2869 /* 2870 * No need to lock since the PR_IP4_USER flag can't be altered for 2871 * existing prisons. 2872 */ 2873 while (pr1 != &prison0 && 2874 #ifdef VIMAGE 2875 !(pr1->pr_flags & PR_VNET) && 2876 #endif 2877 !(pr1->pr_flags & PR_IP4_USER)) 2878 pr1 = pr1->pr_parent; 2879 while (pr2 != &prison0 && 2880 #ifdef VIMAGE 2881 !(pr2->pr_flags & PR_VNET) && 2882 #endif 2883 !(pr2->pr_flags & PR_IP4_USER)) 2884 pr2 = pr2->pr_parent; 2885 return (pr1 == pr2); 2886 } 2887 2888 /* 2889 * Make sure our (source) address is set to something meaningful to this 2890 * jail. 2891 * 2892 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2893 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2894 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2895 */ 2896 int 2897 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2898 { 2899 struct prison *pr; 2900 struct in_addr ia0; 2901 int error; 2902 2903 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2904 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2905 2906 pr = cred->cr_prison; 2907 if (!(pr->pr_flags & PR_IP4)) 2908 return (0); 2909 mtx_lock(&pr->pr_mtx); 2910 if (!(pr->pr_flags & PR_IP4)) { 2911 mtx_unlock(&pr->pr_mtx); 2912 return (0); 2913 } 2914 if (pr->pr_ip4 == NULL) { 2915 mtx_unlock(&pr->pr_mtx); 2916 return (EAFNOSUPPORT); 2917 } 2918 2919 ia0.s_addr = ntohl(ia->s_addr); 2920 if (ia0.s_addr == INADDR_LOOPBACK) { 2921 ia->s_addr = pr->pr_ip4[0].s_addr; 2922 mtx_unlock(&pr->pr_mtx); 2923 return (0); 2924 } 2925 2926 if (ia0.s_addr == INADDR_ANY) { 2927 /* 2928 * In case there is only 1 IPv4 address, bind directly. 2929 */ 2930 if (pr->pr_ip4s == 1) 2931 ia->s_addr = pr->pr_ip4[0].s_addr; 2932 mtx_unlock(&pr->pr_mtx); 2933 return (0); 2934 } 2935 2936 error = _prison_check_ip4(pr, ia); 2937 mtx_unlock(&pr->pr_mtx); 2938 return (error); 2939 } 2940 2941 /* 2942 * Rewrite destination address in case we will connect to loopback address. 2943 * 2944 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2945 * Address passed in in NBO and returned in NBO. 2946 */ 2947 int 2948 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2949 { 2950 struct prison *pr; 2951 2952 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2953 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2954 2955 pr = cred->cr_prison; 2956 if (!(pr->pr_flags & PR_IP4)) 2957 return (0); 2958 mtx_lock(&pr->pr_mtx); 2959 if (!(pr->pr_flags & PR_IP4)) { 2960 mtx_unlock(&pr->pr_mtx); 2961 return (0); 2962 } 2963 if (pr->pr_ip4 == NULL) { 2964 mtx_unlock(&pr->pr_mtx); 2965 return (EAFNOSUPPORT); 2966 } 2967 2968 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2969 ia->s_addr = pr->pr_ip4[0].s_addr; 2970 mtx_unlock(&pr->pr_mtx); 2971 return (0); 2972 } 2973 2974 /* 2975 * Return success because nothing had to be changed. 2976 */ 2977 mtx_unlock(&pr->pr_mtx); 2978 return (0); 2979 } 2980 2981 /* 2982 * Check if given address belongs to the jail referenced by cred/prison. 2983 * 2984 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2985 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2986 * doesn't allow IPv4. Address passed in in NBO. 2987 */ 2988 static int 2989 _prison_check_ip4(const struct prison *pr, const struct in_addr *ia) 2990 { 2991 int i, a, z, d; 2992 2993 /* 2994 * Check the primary IP. 2995 */ 2996 if (pr->pr_ip4[0].s_addr == ia->s_addr) 2997 return (0); 2998 2999 /* 3000 * All the other IPs are sorted so we can do a binary search. 3001 */ 3002 a = 0; 3003 z = pr->pr_ip4s - 2; 3004 while (a <= z) { 3005 i = (a + z) / 2; 3006 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 3007 if (d > 0) 3008 z = i - 1; 3009 else if (d < 0) 3010 a = i + 1; 3011 else 3012 return (0); 3013 } 3014 3015 return (EADDRNOTAVAIL); 3016 } 3017 3018 int 3019 prison_check_ip4(const struct ucred *cred, const struct in_addr *ia) 3020 { 3021 struct prison *pr; 3022 int error; 3023 3024 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3025 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 3026 3027 pr = cred->cr_prison; 3028 if (!(pr->pr_flags & PR_IP4)) 3029 return (0); 3030 mtx_lock(&pr->pr_mtx); 3031 if (!(pr->pr_flags & PR_IP4)) { 3032 mtx_unlock(&pr->pr_mtx); 3033 return (0); 3034 } 3035 if (pr->pr_ip4 == NULL) { 3036 mtx_unlock(&pr->pr_mtx); 3037 return (EAFNOSUPPORT); 3038 } 3039 3040 error = _prison_check_ip4(pr, ia); 3041 mtx_unlock(&pr->pr_mtx); 3042 return (error); 3043 } 3044 #endif 3045 3046 #ifdef INET6 3047 static int 3048 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 3049 { 3050 int ii, ij, used; 3051 struct prison *ppr; 3052 3053 ppr = pr->pr_parent; 3054 if (!(pr->pr_flags & PR_IP6_USER)) { 3055 /* This has no user settings, so just copy the parent's list. */ 3056 if (pr->pr_ip6s < ppr->pr_ip6s) { 3057 /* 3058 * There's no room for the parent's list. Use the 3059 * new list buffer, which is assumed to be big enough 3060 * (if it was passed). If there's no buffer, try to 3061 * allocate one. 3062 */ 3063 used = 1; 3064 if (newip6 == NULL) { 3065 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 3066 M_PRISON, M_NOWAIT); 3067 if (newip6 != NULL) 3068 used = 0; 3069 } 3070 if (newip6 != NULL) { 3071 bcopy(ppr->pr_ip6, newip6, 3072 ppr->pr_ip6s * sizeof(*newip6)); 3073 free(pr->pr_ip6, M_PRISON); 3074 pr->pr_ip6 = newip6; 3075 pr->pr_ip6s = ppr->pr_ip6s; 3076 } 3077 return (used); 3078 } 3079 pr->pr_ip6s = ppr->pr_ip6s; 3080 if (pr->pr_ip6s > 0) 3081 bcopy(ppr->pr_ip6, pr->pr_ip6, 3082 pr->pr_ip6s * sizeof(*newip6)); 3083 else if (pr->pr_ip6 != NULL) { 3084 free(pr->pr_ip6, M_PRISON); 3085 pr->pr_ip6 = NULL; 3086 } 3087 } else if (pr->pr_ip6s > 0) { 3088 /* Remove addresses that aren't in the parent. */ 3089 for (ij = 0; ij < ppr->pr_ip6s; ij++) 3090 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 3091 &ppr->pr_ip6[ij])) 3092 break; 3093 if (ij < ppr->pr_ip6s) 3094 ii = 1; 3095 else { 3096 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 3097 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 3098 ii = 0; 3099 } 3100 for (ij = 1; ii < pr->pr_ip6s; ) { 3101 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 3102 &ppr->pr_ip6[0])) { 3103 ii++; 3104 continue; 3105 } 3106 switch (ij >= ppr->pr_ip6s ? -1 : 3107 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 3108 case -1: 3109 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 3110 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 3111 break; 3112 case 0: 3113 ii++; 3114 ij++; 3115 break; 3116 case 1: 3117 ij++; 3118 break; 3119 } 3120 } 3121 if (pr->pr_ip6s == 0) { 3122 free(pr->pr_ip6, M_PRISON); 3123 pr->pr_ip6 = NULL; 3124 } 3125 } 3126 return 0; 3127 } 3128 3129 /* 3130 * Pass back primary IPv6 address for this jail. 3131 * 3132 * If not restricted return success but do not alter the address. Caller has 3133 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3134 * 3135 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3136 */ 3137 int 3138 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3139 { 3140 struct prison *pr; 3141 3142 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3143 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3144 3145 pr = cred->cr_prison; 3146 if (!(pr->pr_flags & PR_IP6)) 3147 return (0); 3148 mtx_lock(&pr->pr_mtx); 3149 if (!(pr->pr_flags & PR_IP6)) { 3150 mtx_unlock(&pr->pr_mtx); 3151 return (0); 3152 } 3153 if (pr->pr_ip6 == NULL) { 3154 mtx_unlock(&pr->pr_mtx); 3155 return (EAFNOSUPPORT); 3156 } 3157 3158 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3159 mtx_unlock(&pr->pr_mtx); 3160 return (0); 3161 } 3162 3163 /* 3164 * Return 1 if we should do proper source address selection or are not jailed. 3165 * We will return 0 if we should bypass source address selection in favour 3166 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3167 * returned in NBO. 3168 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3169 */ 3170 int 3171 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3172 { 3173 struct prison *pr; 3174 struct in6_addr lia6; 3175 int error; 3176 3177 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3178 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3179 3180 if (!jailed(cred)) 3181 return (1); 3182 3183 pr = cred->cr_prison; 3184 if (pr->pr_flags & PR_IP6_SADDRSEL) 3185 return (1); 3186 3187 lia6 = in6addr_any; 3188 error = prison_get_ip6(cred, &lia6); 3189 if (error) 3190 return (error); 3191 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3192 return (1); 3193 3194 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3195 return (0); 3196 } 3197 3198 /* 3199 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3200 */ 3201 int 3202 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3203 { 3204 3205 if (pr1 == pr2) 3206 return (1); 3207 3208 while (pr1 != &prison0 && 3209 #ifdef VIMAGE 3210 !(pr1->pr_flags & PR_VNET) && 3211 #endif 3212 !(pr1->pr_flags & PR_IP6_USER)) 3213 pr1 = pr1->pr_parent; 3214 while (pr2 != &prison0 && 3215 #ifdef VIMAGE 3216 !(pr2->pr_flags & PR_VNET) && 3217 #endif 3218 !(pr2->pr_flags & PR_IP6_USER)) 3219 pr2 = pr2->pr_parent; 3220 return (pr1 == pr2); 3221 } 3222 3223 /* 3224 * Make sure our (source) address is set to something meaningful to this jail. 3225 * 3226 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3227 * when needed while binding. 3228 * 3229 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3230 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3231 * doesn't allow IPv6. 3232 */ 3233 int 3234 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3235 { 3236 struct prison *pr; 3237 int error; 3238 3239 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3240 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3241 3242 pr = cred->cr_prison; 3243 if (!(pr->pr_flags & PR_IP6)) 3244 return (0); 3245 mtx_lock(&pr->pr_mtx); 3246 if (!(pr->pr_flags & PR_IP6)) { 3247 mtx_unlock(&pr->pr_mtx); 3248 return (0); 3249 } 3250 if (pr->pr_ip6 == NULL) { 3251 mtx_unlock(&pr->pr_mtx); 3252 return (EAFNOSUPPORT); 3253 } 3254 3255 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3256 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3257 mtx_unlock(&pr->pr_mtx); 3258 return (0); 3259 } 3260 3261 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3262 /* 3263 * In case there is only 1 IPv6 address, and v6only is true, 3264 * then bind directly. 3265 */ 3266 if (v6only != 0 && pr->pr_ip6s == 1) 3267 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3268 mtx_unlock(&pr->pr_mtx); 3269 return (0); 3270 } 3271 3272 error = _prison_check_ip6(pr, ia6); 3273 mtx_unlock(&pr->pr_mtx); 3274 return (error); 3275 } 3276 3277 /* 3278 * Rewrite destination address in case we will connect to loopback address. 3279 * 3280 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3281 */ 3282 int 3283 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3284 { 3285 struct prison *pr; 3286 3287 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3288 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3289 3290 pr = cred->cr_prison; 3291 if (!(pr->pr_flags & PR_IP6)) 3292 return (0); 3293 mtx_lock(&pr->pr_mtx); 3294 if (!(pr->pr_flags & PR_IP6)) { 3295 mtx_unlock(&pr->pr_mtx); 3296 return (0); 3297 } 3298 if (pr->pr_ip6 == NULL) { 3299 mtx_unlock(&pr->pr_mtx); 3300 return (EAFNOSUPPORT); 3301 } 3302 3303 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3304 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3305 mtx_unlock(&pr->pr_mtx); 3306 return (0); 3307 } 3308 3309 /* 3310 * Return success because nothing had to be changed. 3311 */ 3312 mtx_unlock(&pr->pr_mtx); 3313 return (0); 3314 } 3315 3316 /* 3317 * Check if given address belongs to the jail referenced by cred/prison. 3318 * 3319 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3320 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3321 * doesn't allow IPv6. 3322 */ 3323 static int 3324 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3325 { 3326 int i, a, z, d; 3327 3328 /* 3329 * Check the primary IP. 3330 */ 3331 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3332 return (0); 3333 3334 /* 3335 * All the other IPs are sorted so we can do a binary search. 3336 */ 3337 a = 0; 3338 z = pr->pr_ip6s - 2; 3339 while (a <= z) { 3340 i = (a + z) / 2; 3341 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3342 if (d > 0) 3343 z = i - 1; 3344 else if (d < 0) 3345 a = i + 1; 3346 else 3347 return (0); 3348 } 3349 3350 return (EADDRNOTAVAIL); 3351 } 3352 3353 int 3354 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3355 { 3356 struct prison *pr; 3357 int error; 3358 3359 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3360 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3361 3362 pr = cred->cr_prison; 3363 if (!(pr->pr_flags & PR_IP6)) 3364 return (0); 3365 mtx_lock(&pr->pr_mtx); 3366 if (!(pr->pr_flags & PR_IP6)) { 3367 mtx_unlock(&pr->pr_mtx); 3368 return (0); 3369 } 3370 if (pr->pr_ip6 == NULL) { 3371 mtx_unlock(&pr->pr_mtx); 3372 return (EAFNOSUPPORT); 3373 } 3374 3375 error = _prison_check_ip6(pr, ia6); 3376 mtx_unlock(&pr->pr_mtx); 3377 return (error); 3378 } 3379 #endif 3380 3381 /* 3382 * Check if a jail supports the given address family. 3383 * 3384 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3385 * if not. 3386 */ 3387 int 3388 prison_check_af(struct ucred *cred, int af) 3389 { 3390 struct prison *pr; 3391 int error; 3392 3393 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3394 3395 pr = cred->cr_prison; 3396 #ifdef VIMAGE 3397 /* Prisons with their own network stack are not limited. */ 3398 if (prison_owns_vnet(cred)) 3399 return (0); 3400 #endif 3401 3402 error = 0; 3403 switch (af) 3404 { 3405 #ifdef INET 3406 case AF_INET: 3407 if (pr->pr_flags & PR_IP4) 3408 { 3409 mtx_lock(&pr->pr_mtx); 3410 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3411 error = EAFNOSUPPORT; 3412 mtx_unlock(&pr->pr_mtx); 3413 } 3414 break; 3415 #endif 3416 #ifdef INET6 3417 case AF_INET6: 3418 if (pr->pr_flags & PR_IP6) 3419 { 3420 mtx_lock(&pr->pr_mtx); 3421 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3422 error = EAFNOSUPPORT; 3423 mtx_unlock(&pr->pr_mtx); 3424 } 3425 break; 3426 #endif 3427 case AF_LOCAL: 3428 case AF_ROUTE: 3429 break; 3430 default: 3431 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3432 error = EAFNOSUPPORT; 3433 } 3434 return (error); 3435 } 3436 3437 /* 3438 * Check if given address belongs to the jail referenced by cred (wrapper to 3439 * prison_check_ip[46]). 3440 * 3441 * Returns 0 if jail doesn't restrict the address family or if address belongs 3442 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3443 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3444 */ 3445 int 3446 prison_if(struct ucred *cred, struct sockaddr *sa) 3447 { 3448 #ifdef INET 3449 struct sockaddr_in *sai; 3450 #endif 3451 #ifdef INET6 3452 struct sockaddr_in6 *sai6; 3453 #endif 3454 int error; 3455 3456 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3457 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3458 3459 #ifdef VIMAGE 3460 if (prison_owns_vnet(cred)) 3461 return (0); 3462 #endif 3463 3464 error = 0; 3465 switch (sa->sa_family) 3466 { 3467 #ifdef INET 3468 case AF_INET: 3469 sai = (struct sockaddr_in *)sa; 3470 error = prison_check_ip4(cred, &sai->sin_addr); 3471 break; 3472 #endif 3473 #ifdef INET6 3474 case AF_INET6: 3475 sai6 = (struct sockaddr_in6 *)sa; 3476 error = prison_check_ip6(cred, &sai6->sin6_addr); 3477 break; 3478 #endif 3479 default: 3480 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3481 error = EAFNOSUPPORT; 3482 } 3483 return (error); 3484 } 3485 3486 /* 3487 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3488 */ 3489 int 3490 prison_check(struct ucred *cred1, struct ucred *cred2) 3491 { 3492 3493 return ((cred1->cr_prison == cred2->cr_prison || 3494 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3495 } 3496 3497 /* 3498 * Return 1 if p2 is a child of p1, otherwise 0. 3499 */ 3500 int 3501 prison_ischild(struct prison *pr1, struct prison *pr2) 3502 { 3503 3504 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3505 if (pr1 == pr2) 3506 return (1); 3507 return (0); 3508 } 3509 3510 /* 3511 * Return 1 if the passed credential is in a jail, otherwise 0. 3512 */ 3513 int 3514 jailed(struct ucred *cred) 3515 { 3516 3517 return (cred->cr_prison != &prison0); 3518 } 3519 3520 /* 3521 * Return 1 if the passed credential is in a jail and that jail does not 3522 * have its own virtual network stack, otherwise 0. 3523 */ 3524 int 3525 jailed_without_vnet(struct ucred *cred) 3526 { 3527 3528 if (!jailed(cred)) 3529 return (0); 3530 #ifdef VIMAGE 3531 if (prison_owns_vnet(cred)) 3532 return (0); 3533 #endif 3534 3535 return (1); 3536 } 3537 3538 /* 3539 * Return the correct hostname (domainname, et al) for the passed credential. 3540 */ 3541 void 3542 getcredhostname(struct ucred *cred, char *buf, size_t size) 3543 { 3544 struct prison *pr; 3545 3546 /* 3547 * A NULL credential can be used to shortcut to the physical 3548 * system's hostname. 3549 */ 3550 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3551 mtx_lock(&pr->pr_mtx); 3552 strlcpy(buf, pr->pr_hostname, size); 3553 mtx_unlock(&pr->pr_mtx); 3554 } 3555 3556 void 3557 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3558 { 3559 3560 mtx_lock(&cred->cr_prison->pr_mtx); 3561 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3562 mtx_unlock(&cred->cr_prison->pr_mtx); 3563 } 3564 3565 void 3566 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3567 { 3568 3569 mtx_lock(&cred->cr_prison->pr_mtx); 3570 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3571 mtx_unlock(&cred->cr_prison->pr_mtx); 3572 } 3573 3574 void 3575 getcredhostid(struct ucred *cred, unsigned long *hostid) 3576 { 3577 3578 mtx_lock(&cred->cr_prison->pr_mtx); 3579 *hostid = cred->cr_prison->pr_hostid; 3580 mtx_unlock(&cred->cr_prison->pr_mtx); 3581 } 3582 3583 #ifdef VIMAGE 3584 /* 3585 * Determine whether the prison represented by cred owns 3586 * its vnet rather than having it inherited. 3587 * 3588 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3589 */ 3590 int 3591 prison_owns_vnet(struct ucred *cred) 3592 { 3593 3594 /* 3595 * vnets cannot be added/removed after jail creation, 3596 * so no need to lock here. 3597 */ 3598 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3599 } 3600 #endif 3601 3602 /* 3603 * Determine whether the subject represented by cred can "see" 3604 * status of a mount point. 3605 * Returns: 0 for permitted, ENOENT otherwise. 3606 * XXX: This function should be called cr_canseemount() and should be 3607 * placed in kern_prot.c. 3608 */ 3609 int 3610 prison_canseemount(struct ucred *cred, struct mount *mp) 3611 { 3612 struct prison *pr; 3613 struct statfs *sp; 3614 size_t len; 3615 3616 pr = cred->cr_prison; 3617 if (pr->pr_enforce_statfs == 0) 3618 return (0); 3619 if (pr->pr_root->v_mount == mp) 3620 return (0); 3621 if (pr->pr_enforce_statfs == 2) 3622 return (ENOENT); 3623 /* 3624 * If jail's chroot directory is set to "/" we should be able to see 3625 * all mount-points from inside a jail. 3626 * This is ugly check, but this is the only situation when jail's 3627 * directory ends with '/'. 3628 */ 3629 if (strcmp(pr->pr_path, "/") == 0) 3630 return (0); 3631 len = strlen(pr->pr_path); 3632 sp = &mp->mnt_stat; 3633 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3634 return (ENOENT); 3635 /* 3636 * Be sure that we don't have situation where jail's root directory 3637 * is "/some/path" and mount point is "/some/pathpath". 3638 */ 3639 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3640 return (ENOENT); 3641 return (0); 3642 } 3643 3644 void 3645 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3646 { 3647 char jpath[MAXPATHLEN]; 3648 struct prison *pr; 3649 size_t len; 3650 3651 pr = cred->cr_prison; 3652 if (pr->pr_enforce_statfs == 0) 3653 return; 3654 if (prison_canseemount(cred, mp) != 0) { 3655 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3656 strlcpy(sp->f_mntonname, "[restricted]", 3657 sizeof(sp->f_mntonname)); 3658 return; 3659 } 3660 if (pr->pr_root->v_mount == mp) { 3661 /* 3662 * Clear current buffer data, so we are sure nothing from 3663 * the valid path left there. 3664 */ 3665 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3666 *sp->f_mntonname = '/'; 3667 return; 3668 } 3669 /* 3670 * If jail's chroot directory is set to "/" we should be able to see 3671 * all mount-points from inside a jail. 3672 */ 3673 if (strcmp(pr->pr_path, "/") == 0) 3674 return; 3675 len = strlen(pr->pr_path); 3676 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3677 /* 3678 * Clear current buffer data, so we are sure nothing from 3679 * the valid path left there. 3680 */ 3681 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3682 if (*jpath == '\0') { 3683 /* Should never happen. */ 3684 *sp->f_mntonname = '/'; 3685 } else { 3686 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3687 } 3688 } 3689 3690 /* 3691 * Check with permission for a specific privilege is granted within jail. We 3692 * have a specific list of accepted privileges; the rest are denied. 3693 */ 3694 int 3695 prison_priv_check(struct ucred *cred, int priv) 3696 { 3697 3698 if (!jailed(cred)) 3699 return (0); 3700 3701 #ifdef VIMAGE 3702 /* 3703 * Privileges specific to prisons with a virtual network stack. 3704 * There might be a duplicate entry here in case the privilege 3705 * is only granted conditionally in the legacy jail case. 3706 */ 3707 switch (priv) { 3708 #ifdef notyet 3709 /* 3710 * NFS-specific privileges. 3711 */ 3712 case PRIV_NFS_DAEMON: 3713 case PRIV_NFS_LOCKD: 3714 #endif 3715 /* 3716 * Network stack privileges. 3717 */ 3718 case PRIV_NET_BRIDGE: 3719 case PRIV_NET_GRE: 3720 case PRIV_NET_BPF: 3721 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3722 case PRIV_NET_ROUTE: 3723 case PRIV_NET_TAP: 3724 case PRIV_NET_SETIFMTU: 3725 case PRIV_NET_SETIFFLAGS: 3726 case PRIV_NET_SETIFCAP: 3727 case PRIV_NET_SETIFDESCR: 3728 case PRIV_NET_SETIFNAME : 3729 case PRIV_NET_SETIFMETRIC: 3730 case PRIV_NET_SETIFPHYS: 3731 case PRIV_NET_SETIFMAC: 3732 case PRIV_NET_ADDMULTI: 3733 case PRIV_NET_DELMULTI: 3734 case PRIV_NET_HWIOCTL: 3735 case PRIV_NET_SETLLADDR: 3736 case PRIV_NET_ADDIFGROUP: 3737 case PRIV_NET_DELIFGROUP: 3738 case PRIV_NET_IFCREATE: 3739 case PRIV_NET_IFDESTROY: 3740 case PRIV_NET_ADDIFADDR: 3741 case PRIV_NET_DELIFADDR: 3742 case PRIV_NET_LAGG: 3743 case PRIV_NET_GIF: 3744 case PRIV_NET_SETIFVNET: 3745 case PRIV_NET_SETIFFIB: 3746 3747 /* 3748 * 802.11-related privileges. 3749 */ 3750 case PRIV_NET80211_GETKEY: 3751 #ifdef notyet 3752 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3753 #endif 3754 3755 #ifdef notyet 3756 /* 3757 * ATM privileges. 3758 */ 3759 case PRIV_NETATM_CFG: 3760 case PRIV_NETATM_ADD: 3761 case PRIV_NETATM_DEL: 3762 case PRIV_NETATM_SET: 3763 3764 /* 3765 * Bluetooth privileges. 3766 */ 3767 case PRIV_NETBLUETOOTH_RAW: 3768 #endif 3769 3770 /* 3771 * Netgraph and netgraph module privileges. 3772 */ 3773 case PRIV_NETGRAPH_CONTROL: 3774 #ifdef notyet 3775 case PRIV_NETGRAPH_TTY: 3776 #endif 3777 3778 /* 3779 * IPv4 and IPv6 privileges. 3780 */ 3781 case PRIV_NETINET_IPFW: 3782 case PRIV_NETINET_DIVERT: 3783 case PRIV_NETINET_PF: 3784 case PRIV_NETINET_DUMMYNET: 3785 case PRIV_NETINET_CARP: 3786 case PRIV_NETINET_MROUTE: 3787 case PRIV_NETINET_RAW: 3788 case PRIV_NETINET_ADDRCTRL6: 3789 case PRIV_NETINET_ND6: 3790 case PRIV_NETINET_SCOPE6: 3791 case PRIV_NETINET_ALIFETIME6: 3792 case PRIV_NETINET_IPSEC: 3793 case PRIV_NETINET_BINDANY: 3794 3795 #ifdef notyet 3796 /* 3797 * NCP privileges. 3798 */ 3799 case PRIV_NETNCP: 3800 3801 /* 3802 * SMB privileges. 3803 */ 3804 case PRIV_NETSMB: 3805 #endif 3806 3807 /* 3808 * No default: or deny here. 3809 * In case of no permit fall through to next switch(). 3810 */ 3811 if (cred->cr_prison->pr_flags & PR_VNET) 3812 return (0); 3813 } 3814 #endif /* VIMAGE */ 3815 3816 switch (priv) { 3817 3818 /* 3819 * Allow ktrace privileges for root in jail. 3820 */ 3821 case PRIV_KTRACE: 3822 3823 #if 0 3824 /* 3825 * Allow jailed processes to configure audit identity and 3826 * submit audit records (login, etc). In the future we may 3827 * want to further refine the relationship between audit and 3828 * jail. 3829 */ 3830 case PRIV_AUDIT_GETAUDIT: 3831 case PRIV_AUDIT_SETAUDIT: 3832 case PRIV_AUDIT_SUBMIT: 3833 #endif 3834 3835 /* 3836 * Allow jailed processes to manipulate process UNIX 3837 * credentials in any way they see fit. 3838 */ 3839 case PRIV_CRED_SETUID: 3840 case PRIV_CRED_SETEUID: 3841 case PRIV_CRED_SETGID: 3842 case PRIV_CRED_SETEGID: 3843 case PRIV_CRED_SETGROUPS: 3844 case PRIV_CRED_SETREUID: 3845 case PRIV_CRED_SETREGID: 3846 case PRIV_CRED_SETRESUID: 3847 case PRIV_CRED_SETRESGID: 3848 3849 /* 3850 * Jail implements visibility constraints already, so allow 3851 * jailed root to override uid/gid-based constraints. 3852 */ 3853 case PRIV_SEEOTHERGIDS: 3854 case PRIV_SEEOTHERUIDS: 3855 3856 /* 3857 * Jail implements inter-process debugging limits already, so 3858 * allow jailed root various debugging privileges. 3859 */ 3860 case PRIV_DEBUG_DIFFCRED: 3861 case PRIV_DEBUG_SUGID: 3862 case PRIV_DEBUG_UNPRIV: 3863 3864 /* 3865 * Allow jail to set various resource limits and login 3866 * properties, and for now, exceed process resource limits. 3867 */ 3868 case PRIV_PROC_LIMIT: 3869 case PRIV_PROC_SETLOGIN: 3870 case PRIV_PROC_SETRLIMIT: 3871 3872 /* 3873 * System V and POSIX IPC privileges are granted in jail. 3874 */ 3875 case PRIV_IPC_READ: 3876 case PRIV_IPC_WRITE: 3877 case PRIV_IPC_ADMIN: 3878 case PRIV_IPC_MSGSIZE: 3879 case PRIV_MQ_ADMIN: 3880 3881 /* 3882 * Jail operations within a jail work on child jails. 3883 */ 3884 case PRIV_JAIL_ATTACH: 3885 case PRIV_JAIL_SET: 3886 case PRIV_JAIL_REMOVE: 3887 3888 /* 3889 * Jail implements its own inter-process limits, so allow 3890 * root processes in jail to change scheduling on other 3891 * processes in the same jail. Likewise for signalling. 3892 */ 3893 case PRIV_SCHED_DIFFCRED: 3894 case PRIV_SCHED_CPUSET: 3895 case PRIV_SIGNAL_DIFFCRED: 3896 case PRIV_SIGNAL_SUGID: 3897 3898 /* 3899 * Allow jailed processes to write to sysctls marked as jail 3900 * writable. 3901 */ 3902 case PRIV_SYSCTL_WRITEJAIL: 3903 3904 /* 3905 * Allow root in jail to manage a variety of quota 3906 * properties. These should likely be conditional on a 3907 * configuration option. 3908 */ 3909 case PRIV_VFS_GETQUOTA: 3910 case PRIV_VFS_SETQUOTA: 3911 3912 /* 3913 * Since Jail relies on chroot() to implement file system 3914 * protections, grant many VFS privileges to root in jail. 3915 * Be careful to exclude mount-related and NFS-related 3916 * privileges. 3917 */ 3918 case PRIV_VFS_READ: 3919 case PRIV_VFS_WRITE: 3920 case PRIV_VFS_ADMIN: 3921 case PRIV_VFS_EXEC: 3922 case PRIV_VFS_LOOKUP: 3923 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3924 case PRIV_VFS_CHFLAGS_DEV: 3925 case PRIV_VFS_CHOWN: 3926 case PRIV_VFS_CHROOT: 3927 case PRIV_VFS_RETAINSUGID: 3928 case PRIV_VFS_FCHROOT: 3929 case PRIV_VFS_LINK: 3930 case PRIV_VFS_SETGID: 3931 case PRIV_VFS_STAT: 3932 case PRIV_VFS_STICKYFILE: 3933 3934 /* 3935 * As in the non-jail case, non-root users are expected to be 3936 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3937 * exists in the jail and they have permission to access it). 3938 */ 3939 case PRIV_KMEM_READ: 3940 return (0); 3941 3942 /* 3943 * Depending on the global setting, allow privilege of 3944 * setting system flags. 3945 */ 3946 case PRIV_VFS_SYSFLAGS: 3947 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3948 return (0); 3949 else 3950 return (EPERM); 3951 3952 /* 3953 * Depending on the global setting, allow privilege of 3954 * mounting/unmounting file systems. 3955 */ 3956 case PRIV_VFS_MOUNT: 3957 case PRIV_VFS_UNMOUNT: 3958 case PRIV_VFS_MOUNT_NONUSER: 3959 case PRIV_VFS_MOUNT_OWNER: 3960 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3961 cred->cr_prison->pr_enforce_statfs < 2) 3962 return (0); 3963 else 3964 return (EPERM); 3965 3966 /* 3967 * Allow jailed root to bind reserved ports and reuse in-use 3968 * ports. 3969 */ 3970 case PRIV_NETINET_RESERVEDPORT: 3971 case PRIV_NETINET_REUSEPORT: 3972 return (0); 3973 3974 /* 3975 * Allow jailed root to set certian IPv4/6 (option) headers. 3976 */ 3977 case PRIV_NETINET_SETHDROPTS: 3978 return (0); 3979 3980 /* 3981 * Conditionally allow creating raw sockets in jail. 3982 */ 3983 case PRIV_NETINET_RAW: 3984 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3985 return (0); 3986 else 3987 return (EPERM); 3988 3989 /* 3990 * Since jail implements its own visibility limits on netstat 3991 * sysctls, allow getcred. This allows identd to work in 3992 * jail. 3993 */ 3994 case PRIV_NETINET_GETCRED: 3995 return (0); 3996 3997 /* 3998 * Allow jailed root to set loginclass. 3999 */ 4000 case PRIV_PROC_SETLOGINCLASS: 4001 return (0); 4002 4003 default: 4004 /* 4005 * In all remaining cases, deny the privilege request. This 4006 * includes almost all network privileges, many system 4007 * configuration privileges. 4008 */ 4009 return (EPERM); 4010 } 4011 } 4012 4013 /* 4014 * Return the part of pr2's name that is relative to pr1, or the whole name 4015 * if it does not directly follow. 4016 */ 4017 4018 char * 4019 prison_name(struct prison *pr1, struct prison *pr2) 4020 { 4021 char *name; 4022 4023 /* Jails see themselves as "0" (if they see themselves at all). */ 4024 if (pr1 == pr2) 4025 return "0"; 4026 name = pr2->pr_name; 4027 if (prison_ischild(pr1, pr2)) { 4028 /* 4029 * pr1 isn't locked (and allprison_lock may not be either) 4030 * so its length can't be counted on. But the number of dots 4031 * can be counted on - and counted. 4032 */ 4033 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 4034 name = strchr(name, '.') + 1; 4035 } 4036 return (name); 4037 } 4038 4039 /* 4040 * Return the part of pr2's path that is relative to pr1, or the whole path 4041 * if it does not directly follow. 4042 */ 4043 static char * 4044 prison_path(struct prison *pr1, struct prison *pr2) 4045 { 4046 char *path1, *path2; 4047 int len1; 4048 4049 path1 = pr1->pr_path; 4050 path2 = pr2->pr_path; 4051 if (!strcmp(path1, "/")) 4052 return (path2); 4053 len1 = strlen(path1); 4054 if (strncmp(path1, path2, len1)) 4055 return (path2); 4056 if (path2[len1] == '\0') 4057 return "/"; 4058 if (path2[len1] == '/') 4059 return (path2 + len1); 4060 return (path2); 4061 } 4062 4063 4064 /* 4065 * Jail-related sysctls. 4066 */ 4067 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 4068 "Jails"); 4069 4070 static int 4071 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4072 { 4073 struct xprison *xp; 4074 struct prison *pr, *cpr; 4075 #ifdef INET 4076 struct in_addr *ip4 = NULL; 4077 int ip4s = 0; 4078 #endif 4079 #ifdef INET6 4080 struct in6_addr *ip6 = NULL; 4081 int ip6s = 0; 4082 #endif 4083 int descend, error; 4084 4085 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4086 pr = req->td->td_ucred->cr_prison; 4087 error = 0; 4088 sx_slock(&allprison_lock); 4089 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4090 #if defined(INET) || defined(INET6) 4091 again: 4092 #endif 4093 mtx_lock(&cpr->pr_mtx); 4094 #ifdef INET 4095 if (cpr->pr_ip4s > 0) { 4096 if (ip4s < cpr->pr_ip4s) { 4097 ip4s = cpr->pr_ip4s; 4098 mtx_unlock(&cpr->pr_mtx); 4099 ip4 = realloc(ip4, ip4s * 4100 sizeof(struct in_addr), M_TEMP, M_WAITOK); 4101 goto again; 4102 } 4103 bcopy(cpr->pr_ip4, ip4, 4104 cpr->pr_ip4s * sizeof(struct in_addr)); 4105 } 4106 #endif 4107 #ifdef INET6 4108 if (cpr->pr_ip6s > 0) { 4109 if (ip6s < cpr->pr_ip6s) { 4110 ip6s = cpr->pr_ip6s; 4111 mtx_unlock(&cpr->pr_mtx); 4112 ip6 = realloc(ip6, ip6s * 4113 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 4114 goto again; 4115 } 4116 bcopy(cpr->pr_ip6, ip6, 4117 cpr->pr_ip6s * sizeof(struct in6_addr)); 4118 } 4119 #endif 4120 if (cpr->pr_ref == 0) { 4121 mtx_unlock(&cpr->pr_mtx); 4122 continue; 4123 } 4124 bzero(xp, sizeof(*xp)); 4125 xp->pr_version = XPRISON_VERSION; 4126 xp->pr_id = cpr->pr_id; 4127 xp->pr_state = cpr->pr_uref > 0 4128 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4129 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4130 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4131 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4132 #ifdef INET 4133 xp->pr_ip4s = cpr->pr_ip4s; 4134 #endif 4135 #ifdef INET6 4136 xp->pr_ip6s = cpr->pr_ip6s; 4137 #endif 4138 mtx_unlock(&cpr->pr_mtx); 4139 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4140 if (error) 4141 break; 4142 #ifdef INET 4143 if (xp->pr_ip4s > 0) { 4144 error = SYSCTL_OUT(req, ip4, 4145 xp->pr_ip4s * sizeof(struct in_addr)); 4146 if (error) 4147 break; 4148 } 4149 #endif 4150 #ifdef INET6 4151 if (xp->pr_ip6s > 0) { 4152 error = SYSCTL_OUT(req, ip6, 4153 xp->pr_ip6s * sizeof(struct in6_addr)); 4154 if (error) 4155 break; 4156 } 4157 #endif 4158 } 4159 sx_sunlock(&allprison_lock); 4160 free(xp, M_TEMP); 4161 #ifdef INET 4162 free(ip4, M_TEMP); 4163 #endif 4164 #ifdef INET6 4165 free(ip6, M_TEMP); 4166 #endif 4167 return (error); 4168 } 4169 4170 SYSCTL_OID(_security_jail, OID_AUTO, list, 4171 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4172 sysctl_jail_list, "S", "List of active jails"); 4173 4174 static int 4175 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4176 { 4177 int error, injail; 4178 4179 injail = jailed(req->td->td_ucred); 4180 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4181 4182 return (error); 4183 } 4184 4185 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4186 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4187 sysctl_jail_jailed, "I", "Process in jail?"); 4188 4189 static int 4190 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4191 { 4192 int error, havevnet; 4193 #ifdef VIMAGE 4194 struct ucred *cred = req->td->td_ucred; 4195 4196 havevnet = jailed(cred) && prison_owns_vnet(cred); 4197 #else 4198 havevnet = 0; 4199 #endif 4200 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4201 4202 return (error); 4203 } 4204 4205 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4206 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4207 sysctl_jail_vnet, "I", "Jail owns VNET?"); 4208 4209 #if defined(INET) || defined(INET6) 4210 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4211 &jail_max_af_ips, 0, 4212 "Number of IP addresses a jail may have at most per address family"); 4213 #endif 4214 4215 /* 4216 * Default parameters for jail(2) compatability. For historical reasons, 4217 * the sysctl names have varying similarity to the parameter names. Prisons 4218 * just see their own parameters, and can't change them. 4219 */ 4220 static int 4221 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4222 { 4223 struct prison *pr; 4224 int allow, error, i; 4225 4226 pr = req->td->td_ucred->cr_prison; 4227 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4228 4229 /* Get the current flag value, and convert it to a boolean. */ 4230 i = (allow & arg2) ? 1 : 0; 4231 if (arg1 != NULL) 4232 i = !i; 4233 error = sysctl_handle_int(oidp, &i, 0, req); 4234 if (error || !req->newptr) 4235 return (error); 4236 i = i ? arg2 : 0; 4237 if (arg1 != NULL) 4238 i ^= arg2; 4239 /* 4240 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4241 * for writing. 4242 */ 4243 mtx_lock(&prison0.pr_mtx); 4244 jail_default_allow = (jail_default_allow & ~arg2) | i; 4245 mtx_unlock(&prison0.pr_mtx); 4246 return (0); 4247 } 4248 4249 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4250 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4251 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4252 "Processes in jail can set their hostnames"); 4253 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4254 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4255 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4256 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 4257 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4258 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4259 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4260 "Processes in jail can use System V IPC primitives"); 4261 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4262 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4263 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4264 "Prison root can create raw sockets"); 4265 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4266 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4267 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4268 "Processes in jail can alter system file flags"); 4269 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4270 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4271 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4272 "Processes in jail can mount/unmount jail-friendly file systems"); 4273 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 4274 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4275 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 4276 "Processes in jail can mount the devfs file system"); 4277 SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed, 4278 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4279 NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I", 4280 "Processes in jail can mount the fdescfs file system"); 4281 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 4282 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4283 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 4284 "Processes in jail can mount the nullfs file system"); 4285 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 4286 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4287 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 4288 "Processes in jail can mount the procfs file system"); 4289 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed, 4290 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4291 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I", 4292 "Processes in jail can mount the tmpfs file system"); 4293 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 4294 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4295 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 4296 "Processes in jail can mount the zfs file system"); 4297 4298 static int 4299 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4300 { 4301 struct prison *pr; 4302 int level, error; 4303 4304 pr = req->td->td_ucred->cr_prison; 4305 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4306 error = sysctl_handle_int(oidp, &level, 0, req); 4307 if (error || !req->newptr) 4308 return (error); 4309 *(int *)arg1 = level; 4310 return (0); 4311 } 4312 4313 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4314 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4315 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4316 sysctl_jail_default_level, "I", 4317 "Processes in jail cannot see all mounted file systems"); 4318 4319 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4320 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4321 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4322 sysctl_jail_default_level, "I", 4323 "Ruleset for the devfs filesystem in jail"); 4324 4325 /* 4326 * Nodes to describe jail parameters. Maximum length of string parameters 4327 * is returned in the string itself, and the other parameters exist merely 4328 * to make themselves and their types known. 4329 */ 4330 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4331 "Jail parameters"); 4332 4333 int 4334 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4335 { 4336 int i; 4337 long l; 4338 size_t s; 4339 char numbuf[12]; 4340 4341 switch (oidp->oid_kind & CTLTYPE) 4342 { 4343 case CTLTYPE_LONG: 4344 case CTLTYPE_ULONG: 4345 l = 0; 4346 #ifdef SCTL_MASK32 4347 if (!(req->flags & SCTL_MASK32)) 4348 #endif 4349 return (SYSCTL_OUT(req, &l, sizeof(l))); 4350 case CTLTYPE_INT: 4351 case CTLTYPE_UINT: 4352 i = 0; 4353 return (SYSCTL_OUT(req, &i, sizeof(i))); 4354 case CTLTYPE_STRING: 4355 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4356 return 4357 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4358 case CTLTYPE_STRUCT: 4359 s = (size_t)arg2; 4360 return (SYSCTL_OUT(req, &s, sizeof(s))); 4361 } 4362 return (0); 4363 } 4364 4365 /* 4366 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 4367 * jail creation time but cannot be changed in an existing jail. 4368 */ 4369 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4370 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4371 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4372 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4373 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4374 "I", "Jail secure level"); 4375 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 4376 "Jail value for kern.osreldate and uname -K"); 4377 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 4378 "Jail value for kern.osrelease and uname -r"); 4379 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4380 "I", "Jail cannot see all mounted file systems"); 4381 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4382 "I", "Ruleset for in-jail devfs mounts"); 4383 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4384 "B", "Jail persistence"); 4385 #ifdef VIMAGE 4386 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4387 "E,jailsys", "Virtual network stack"); 4388 #endif 4389 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4390 "B", "Jail is in the process of shutting down"); 4391 4392 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4393 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4394 "I", "Current number of child jails"); 4395 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4396 "I", "Maximum number of child jails"); 4397 4398 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4399 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4400 "Jail hostname"); 4401 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4402 "Jail NIS domainname"); 4403 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4404 "Jail host UUID"); 4405 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4406 "LU", "Jail host ID"); 4407 4408 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4409 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4410 4411 #ifdef INET 4412 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4413 "Jail IPv4 address virtualization"); 4414 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4415 "S,in_addr,a", "Jail IPv4 addresses"); 4416 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4417 "B", "Do (not) use IPv4 source address selection rather than the " 4418 "primary jail IPv4 address."); 4419 #endif 4420 #ifdef INET6 4421 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4422 "Jail IPv6 address virtualization"); 4423 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4424 "S,in6_addr,a", "Jail IPv6 addresses"); 4425 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4426 "B", "Do (not) use IPv6 source address selection rather than the " 4427 "primary jail IPv6 address."); 4428 #endif 4429 4430 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4431 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4432 "B", "Jail may set hostname"); 4433 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4434 "B", "Jail may use SYSV IPC"); 4435 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4436 "B", "Jail may create raw sockets"); 4437 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4438 "B", "Jail may alter system file flags"); 4439 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4440 "B", "Jail may set file quotas"); 4441 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4442 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4443 4444 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4445 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4446 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4447 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 4448 "B", "Jail may mount the devfs file system"); 4449 SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW, 4450 "B", "Jail may mount the fdescfs file system"); 4451 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 4452 "B", "Jail may mount the nullfs file system"); 4453 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 4454 "B", "Jail may mount the procfs file system"); 4455 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW, 4456 "B", "Jail may mount the tmpfs file system"); 4457 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 4458 "B", "Jail may mount the zfs file system"); 4459 4460 void 4461 prison_racct_foreach(void (*callback)(struct racct *racct, 4462 void *arg2, void *arg3), void *arg2, void *arg3) 4463 { 4464 struct prison_racct *prr; 4465 4466 sx_slock(&allprison_lock); 4467 LIST_FOREACH(prr, &allprison_racct, prr_next) 4468 (callback)(prr->prr_racct, arg2, arg3); 4469 sx_sunlock(&allprison_lock); 4470 } 4471 4472 static struct prison_racct * 4473 prison_racct_find_locked(const char *name) 4474 { 4475 struct prison_racct *prr; 4476 4477 sx_assert(&allprison_lock, SA_XLOCKED); 4478 4479 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4480 return (NULL); 4481 4482 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4483 if (strcmp(name, prr->prr_name) != 0) 4484 continue; 4485 4486 /* Found prison_racct with a matching name? */ 4487 prison_racct_hold(prr); 4488 return (prr); 4489 } 4490 4491 /* Add new prison_racct. */ 4492 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4493 racct_create(&prr->prr_racct); 4494 4495 strcpy(prr->prr_name, name); 4496 refcount_init(&prr->prr_refcount, 1); 4497 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4498 4499 return (prr); 4500 } 4501 4502 struct prison_racct * 4503 prison_racct_find(const char *name) 4504 { 4505 struct prison_racct *prr; 4506 4507 sx_xlock(&allprison_lock); 4508 prr = prison_racct_find_locked(name); 4509 sx_xunlock(&allprison_lock); 4510 return (prr); 4511 } 4512 4513 void 4514 prison_racct_hold(struct prison_racct *prr) 4515 { 4516 4517 refcount_acquire(&prr->prr_refcount); 4518 } 4519 4520 static void 4521 prison_racct_free_locked(struct prison_racct *prr) 4522 { 4523 4524 sx_assert(&allprison_lock, SA_XLOCKED); 4525 4526 if (refcount_release(&prr->prr_refcount)) { 4527 racct_destroy(&prr->prr_racct); 4528 LIST_REMOVE(prr, prr_next); 4529 free(prr, M_PRISON_RACCT); 4530 } 4531 } 4532 4533 void 4534 prison_racct_free(struct prison_racct *prr) 4535 { 4536 int old; 4537 4538 sx_assert(&allprison_lock, SA_UNLOCKED); 4539 4540 old = prr->prr_refcount; 4541 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4542 return; 4543 4544 sx_xlock(&allprison_lock); 4545 prison_racct_free_locked(prr); 4546 sx_xunlock(&allprison_lock); 4547 } 4548 4549 #ifdef RACCT 4550 static void 4551 prison_racct_attach(struct prison *pr) 4552 { 4553 struct prison_racct *prr; 4554 4555 sx_assert(&allprison_lock, SA_XLOCKED); 4556 4557 prr = prison_racct_find_locked(pr->pr_name); 4558 KASSERT(prr != NULL, ("cannot find prison_racct")); 4559 4560 pr->pr_prison_racct = prr; 4561 } 4562 4563 /* 4564 * Handle jail renaming. From the racct point of view, renaming means 4565 * moving from one prison_racct to another. 4566 */ 4567 static void 4568 prison_racct_modify(struct prison *pr) 4569 { 4570 struct proc *p; 4571 struct ucred *cred; 4572 struct prison_racct *oldprr; 4573 4574 sx_slock(&allproc_lock); 4575 sx_xlock(&allprison_lock); 4576 4577 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4578 sx_xunlock(&allprison_lock); 4579 sx_sunlock(&allproc_lock); 4580 return; 4581 } 4582 4583 oldprr = pr->pr_prison_racct; 4584 pr->pr_prison_racct = NULL; 4585 4586 prison_racct_attach(pr); 4587 4588 /* 4589 * Move resource utilisation records. 4590 */ 4591 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4592 4593 /* 4594 * Force rctl to reattach rules to processes. 4595 */ 4596 FOREACH_PROC_IN_SYSTEM(p) { 4597 PROC_LOCK(p); 4598 cred = crhold(p->p_ucred); 4599 PROC_UNLOCK(p); 4600 racct_proc_ucred_changed(p, cred, cred); 4601 crfree(cred); 4602 } 4603 4604 sx_sunlock(&allproc_lock); 4605 prison_racct_free_locked(oldprr); 4606 sx_xunlock(&allprison_lock); 4607 } 4608 4609 static void 4610 prison_racct_detach(struct prison *pr) 4611 { 4612 4613 sx_assert(&allprison_lock, SA_UNLOCKED); 4614 4615 if (pr->pr_prison_racct == NULL) 4616 return; 4617 prison_racct_free(pr->pr_prison_racct); 4618 pr->pr_prison_racct = NULL; 4619 } 4620 #endif /* RACCT */ 4621 4622 #ifdef DDB 4623 4624 static void 4625 db_show_prison(struct prison *pr) 4626 { 4627 int fi; 4628 #if defined(INET) || defined(INET6) 4629 int ii; 4630 #endif 4631 unsigned jsf; 4632 #ifdef INET6 4633 char ip6buf[INET6_ADDRSTRLEN]; 4634 #endif 4635 4636 db_printf("prison %p:\n", pr); 4637 db_printf(" jid = %d\n", pr->pr_id); 4638 db_printf(" name = %s\n", pr->pr_name); 4639 db_printf(" parent = %p\n", pr->pr_parent); 4640 db_printf(" ref = %d\n", pr->pr_ref); 4641 db_printf(" uref = %d\n", pr->pr_uref); 4642 db_printf(" path = %s\n", pr->pr_path); 4643 db_printf(" cpuset = %d\n", pr->pr_cpuset 4644 ? pr->pr_cpuset->cs_id : -1); 4645 #ifdef VIMAGE 4646 db_printf(" vnet = %p\n", pr->pr_vnet); 4647 #endif 4648 db_printf(" root = %p\n", pr->pr_root); 4649 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4650 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4651 db_printf(" children.max = %d\n", pr->pr_childmax); 4652 db_printf(" children.cur = %d\n", pr->pr_childcount); 4653 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4654 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4655 db_printf(" flags = 0x%x", pr->pr_flags); 4656 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4657 fi++) 4658 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4659 db_printf(" %s", pr_flag_names[fi]); 4660 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4661 fi++) { 4662 jsf = pr->pr_flags & 4663 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4664 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4665 pr_flag_jailsys[fi].disable && 4666 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4667 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4668 : "inherit"); 4669 } 4670 db_printf(" allow = 0x%x", pr->pr_allow); 4671 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4672 fi++) 4673 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4674 db_printf(" %s", pr_allow_names[fi]); 4675 db_printf("\n"); 4676 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4677 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4678 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4679 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4680 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4681 #ifdef INET 4682 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4683 for (ii = 0; ii < pr->pr_ip4s; ii++) 4684 db_printf(" %s %s\n", 4685 ii == 0 ? "ip4.addr =" : " ", 4686 inet_ntoa(pr->pr_ip4[ii])); 4687 #endif 4688 #ifdef INET6 4689 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4690 for (ii = 0; ii < pr->pr_ip6s; ii++) 4691 db_printf(" %s %s\n", 4692 ii == 0 ? "ip6.addr =" : " ", 4693 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4694 #endif 4695 } 4696 4697 DB_SHOW_COMMAND(prison, db_show_prison_command) 4698 { 4699 struct prison *pr; 4700 4701 if (!have_addr) { 4702 /* 4703 * Show all prisons in the list, and prison0 which is not 4704 * listed. 4705 */ 4706 db_show_prison(&prison0); 4707 if (!db_pager_quit) { 4708 TAILQ_FOREACH(pr, &allprison, pr_list) { 4709 db_show_prison(pr); 4710 if (db_pager_quit) 4711 break; 4712 } 4713 } 4714 return; 4715 } 4716 4717 if (addr == 0) 4718 pr = &prison0; 4719 else { 4720 /* Look for a prison with the ID and with references. */ 4721 TAILQ_FOREACH(pr, &allprison, pr_list) 4722 if (pr->pr_id == addr && pr->pr_ref > 0) 4723 break; 4724 if (pr == NULL) 4725 /* Look again, without requiring a reference. */ 4726 TAILQ_FOREACH(pr, &allprison, pr_list) 4727 if (pr->pr_id == addr) 4728 break; 4729 if (pr == NULL) 4730 /* Assume address points to a valid prison. */ 4731 pr = (struct prison *)addr; 4732 } 4733 db_show_prison(pr); 4734 } 4735 4736 #endif /* DDB */ 4737