1 /*- 2 * Copyright (c) 1999 Poul-Henning Kamp. 3 * Copyright (c) 2008 Bjoern A. Zeeb. 4 * Copyright (c) 2009 James Gritton. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_compat.h" 33 #include "opt_ddb.h" 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/kernel.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/sysproto.h> 43 #include <sys/malloc.h> 44 #include <sys/osd.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/taskqueue.h> 48 #include <sys/fcntl.h> 49 #include <sys/jail.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/racct.h> 53 #include <sys/refcount.h> 54 #include <sys/sx.h> 55 #include <sys/sysent.h> 56 #include <sys/namei.h> 57 #include <sys/mount.h> 58 #include <sys/queue.h> 59 #include <sys/socket.h> 60 #include <sys/syscallsubr.h> 61 #include <sys/sysctl.h> 62 #include <sys/vnode.h> 63 64 #include <net/if.h> 65 #include <net/vnet.h> 66 67 #include <netinet/in.h> 68 69 #ifdef DDB 70 #include <ddb/ddb.h> 71 #endif /* DDB */ 72 73 #include <security/mac/mac_framework.h> 74 75 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 76 77 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 78 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 79 80 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 81 #ifdef INET 82 #ifdef INET6 83 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 84 #else 85 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 86 #endif 87 #else /* !INET */ 88 #ifdef INET6 89 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 90 #else 91 #define _PR_IP_SADDRSEL 0 92 #endif 93 #endif 94 95 /* prison0 describes what is "real" about the system. */ 96 struct prison prison0 = { 97 .pr_id = 0, 98 .pr_name = "0", 99 .pr_ref = 1, 100 .pr_uref = 1, 101 .pr_path = "/", 102 .pr_securelevel = -1, 103 .pr_devfs_rsnum = 0, 104 .pr_childmax = JAIL_MAX, 105 .pr_hostuuid = DEFAULT_HOSTUUID, 106 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 107 #ifdef VIMAGE 108 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 109 #else 110 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 111 #endif 112 .pr_allow = PR_ALLOW_ALL, 113 }; 114 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 115 116 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 117 struct sx allprison_lock; 118 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 119 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 120 LIST_HEAD(, prison_racct) allprison_racct; 121 int lastprid = 0; 122 123 static int do_jail_attach(struct thread *td, struct prison *pr); 124 static void prison_complete(void *context, int pending); 125 static void prison_deref(struct prison *pr, int flags); 126 static char *prison_path(struct prison *pr1, struct prison *pr2); 127 static void prison_remove_one(struct prison *pr); 128 #ifdef RACCT 129 static void prison_racct_attach(struct prison *pr); 130 static void prison_racct_modify(struct prison *pr); 131 static void prison_racct_detach(struct prison *pr); 132 #endif 133 #ifdef INET 134 static int _prison_check_ip4(const struct prison *, const struct in_addr *); 135 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4); 136 #endif 137 #ifdef INET6 138 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6); 139 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6); 140 #endif 141 142 /* Flags for prison_deref */ 143 #define PD_DEREF 0x01 144 #define PD_DEUREF 0x02 145 #define PD_LOCKED 0x04 146 #define PD_LIST_SLOCKED 0x08 147 #define PD_LIST_XLOCKED 0x10 148 149 /* 150 * Parameter names corresponding to PR_* flag values. Size values are for kvm 151 * as we cannot figure out the size of a sparse array, or an array without a 152 * terminating entry. 153 */ 154 static char *pr_flag_names[] = { 155 [0] = "persist", 156 #ifdef INET 157 [7] = "ip4.saddrsel", 158 #endif 159 #ifdef INET6 160 [8] = "ip6.saddrsel", 161 #endif 162 }; 163 const size_t pr_flag_names_size = sizeof(pr_flag_names); 164 165 static char *pr_flag_nonames[] = { 166 [0] = "nopersist", 167 #ifdef INET 168 [7] = "ip4.nosaddrsel", 169 #endif 170 #ifdef INET6 171 [8] = "ip6.nosaddrsel", 172 #endif 173 }; 174 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames); 175 176 struct jailsys_flags { 177 const char *name; 178 unsigned disable; 179 unsigned new; 180 } pr_flag_jailsys[] = { 181 { "host", 0, PR_HOST }, 182 #ifdef VIMAGE 183 { "vnet", 0, PR_VNET }, 184 #endif 185 #ifdef INET 186 { "ip4", PR_IP4_USER, PR_IP4_USER }, 187 #endif 188 #ifdef INET6 189 { "ip6", PR_IP6_USER, PR_IP6_USER }, 190 #endif 191 }; 192 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 193 194 static char *pr_allow_names[] = { 195 "allow.set_hostname", 196 "allow.sysvipc", 197 "allow.raw_sockets", 198 "allow.chflags", 199 "allow.mount", 200 "allow.quotas", 201 "allow.socket_af", 202 "allow.mount.devfs", 203 "allow.mount.nullfs", 204 "allow.mount.zfs", 205 "allow.mount.procfs", 206 "allow.mount.tmpfs", 207 "allow.mount.fdescfs", 208 }; 209 const size_t pr_allow_names_size = sizeof(pr_allow_names); 210 211 static char *pr_allow_nonames[] = { 212 "allow.noset_hostname", 213 "allow.nosysvipc", 214 "allow.noraw_sockets", 215 "allow.nochflags", 216 "allow.nomount", 217 "allow.noquotas", 218 "allow.nosocket_af", 219 "allow.mount.nodevfs", 220 "allow.mount.nonullfs", 221 "allow.mount.nozfs", 222 "allow.mount.noprocfs", 223 "allow.mount.notmpfs", 224 "allow.mount.nofdescfs", 225 }; 226 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames); 227 228 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 229 #define JAIL_DEFAULT_ENFORCE_STATFS 2 230 #define JAIL_DEFAULT_DEVFS_RSNUM 0 231 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 232 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 233 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 234 #if defined(INET) || defined(INET6) 235 static unsigned jail_max_af_ips = 255; 236 #endif 237 238 /* 239 * Initialize the parts of prison0 that can't be static-initialized with 240 * constants. This is called from proc0_init() after creating thread0 cpuset. 241 */ 242 void 243 prison0_init(void) 244 { 245 246 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 247 prison0.pr_osreldate = osreldate; 248 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 249 } 250 251 #ifdef INET 252 static int 253 qcmp_v4(const void *ip1, const void *ip2) 254 { 255 in_addr_t iaa, iab; 256 257 /* 258 * We need to compare in HBO here to get the list sorted as expected 259 * by the result of the code. Sorting NBO addresses gives you 260 * interesting results. If you do not understand, do not try. 261 */ 262 iaa = ntohl(((const struct in_addr *)ip1)->s_addr); 263 iab = ntohl(((const struct in_addr *)ip2)->s_addr); 264 265 /* 266 * Do not simply return the difference of the two numbers, the int is 267 * not wide enough. 268 */ 269 if (iaa > iab) 270 return (1); 271 else if (iaa < iab) 272 return (-1); 273 else 274 return (0); 275 } 276 #endif 277 278 #ifdef INET6 279 static int 280 qcmp_v6(const void *ip1, const void *ip2) 281 { 282 const struct in6_addr *ia6a, *ia6b; 283 int i, rc; 284 285 ia6a = (const struct in6_addr *)ip1; 286 ia6b = (const struct in6_addr *)ip2; 287 288 rc = 0; 289 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 290 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 291 rc = 1; 292 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 293 rc = -1; 294 } 295 return (rc); 296 } 297 #endif 298 299 /* 300 * struct jail_args { 301 * struct jail *jail; 302 * }; 303 */ 304 int 305 sys_jail(struct thread *td, struct jail_args *uap) 306 { 307 uint32_t version; 308 int error; 309 struct jail j; 310 311 error = copyin(uap->jail, &version, sizeof(uint32_t)); 312 if (error) 313 return (error); 314 315 switch (version) { 316 case 0: 317 { 318 struct jail_v0 j0; 319 320 /* FreeBSD single IPv4 jails. */ 321 bzero(&j, sizeof(struct jail)); 322 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 323 if (error) 324 return (error); 325 j.version = j0.version; 326 j.path = j0.path; 327 j.hostname = j0.hostname; 328 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 329 break; 330 } 331 332 case 1: 333 /* 334 * Version 1 was used by multi-IPv4 jail implementations 335 * that never made it into the official kernel. 336 */ 337 return (EINVAL); 338 339 case 2: /* JAIL_API_VERSION */ 340 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 341 error = copyin(uap->jail, &j, sizeof(struct jail)); 342 if (error) 343 return (error); 344 break; 345 346 default: 347 /* Sci-Fi jails are not supported, sorry. */ 348 return (EINVAL); 349 } 350 return (kern_jail(td, &j)); 351 } 352 353 int 354 kern_jail(struct thread *td, struct jail *j) 355 { 356 struct iovec optiov[2 * (4 357 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0]) 358 #ifdef INET 359 + 1 360 #endif 361 #ifdef INET6 362 + 1 363 #endif 364 )]; 365 struct uio opt; 366 char *u_path, *u_hostname, *u_name; 367 #ifdef INET 368 uint32_t ip4s; 369 struct in_addr *u_ip4; 370 #endif 371 #ifdef INET6 372 struct in6_addr *u_ip6; 373 #endif 374 size_t tmplen; 375 int error, enforce_statfs, fi; 376 377 bzero(&optiov, sizeof(optiov)); 378 opt.uio_iov = optiov; 379 opt.uio_iovcnt = 0; 380 opt.uio_offset = -1; 381 opt.uio_resid = -1; 382 opt.uio_segflg = UIO_SYSSPACE; 383 opt.uio_rw = UIO_READ; 384 opt.uio_td = td; 385 386 /* Set permissions for top-level jails from sysctls. */ 387 if (!jailed(td->td_ucred)) { 388 for (fi = 0; fi < sizeof(pr_allow_names) / 389 sizeof(pr_allow_names[0]); fi++) { 390 optiov[opt.uio_iovcnt].iov_base = 391 (jail_default_allow & (1 << fi)) 392 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 393 optiov[opt.uio_iovcnt].iov_len = 394 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 395 opt.uio_iovcnt += 2; 396 } 397 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 398 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 399 opt.uio_iovcnt++; 400 enforce_statfs = jail_default_enforce_statfs; 401 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 402 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 403 opt.uio_iovcnt++; 404 } 405 406 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 407 #ifdef INET 408 ip4s = (j->version == 0) ? 1 : j->ip4s; 409 if (ip4s > jail_max_af_ips) 410 return (EINVAL); 411 tmplen += ip4s * sizeof(struct in_addr); 412 #else 413 if (j->ip4s > 0) 414 return (EINVAL); 415 #endif 416 #ifdef INET6 417 if (j->ip6s > jail_max_af_ips) 418 return (EINVAL); 419 tmplen += j->ip6s * sizeof(struct in6_addr); 420 #else 421 if (j->ip6s > 0) 422 return (EINVAL); 423 #endif 424 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 425 u_hostname = u_path + MAXPATHLEN; 426 u_name = u_hostname + MAXHOSTNAMELEN; 427 #ifdef INET 428 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 429 #endif 430 #ifdef INET6 431 #ifdef INET 432 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 433 #else 434 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 435 #endif 436 #endif 437 optiov[opt.uio_iovcnt].iov_base = "path"; 438 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 439 opt.uio_iovcnt++; 440 optiov[opt.uio_iovcnt].iov_base = u_path; 441 error = copyinstr(j->path, u_path, MAXPATHLEN, 442 &optiov[opt.uio_iovcnt].iov_len); 443 if (error) { 444 free(u_path, M_TEMP); 445 return (error); 446 } 447 opt.uio_iovcnt++; 448 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 449 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 450 opt.uio_iovcnt++; 451 optiov[opt.uio_iovcnt].iov_base = u_hostname; 452 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 453 &optiov[opt.uio_iovcnt].iov_len); 454 if (error) { 455 free(u_path, M_TEMP); 456 return (error); 457 } 458 opt.uio_iovcnt++; 459 if (j->jailname != NULL) { 460 optiov[opt.uio_iovcnt].iov_base = "name"; 461 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 462 opt.uio_iovcnt++; 463 optiov[opt.uio_iovcnt].iov_base = u_name; 464 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 465 &optiov[opt.uio_iovcnt].iov_len); 466 if (error) { 467 free(u_path, M_TEMP); 468 return (error); 469 } 470 opt.uio_iovcnt++; 471 } 472 #ifdef INET 473 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 474 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 475 opt.uio_iovcnt++; 476 optiov[opt.uio_iovcnt].iov_base = u_ip4; 477 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 478 if (j->version == 0) 479 u_ip4->s_addr = j->ip4s; 480 else { 481 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 482 if (error) { 483 free(u_path, M_TEMP); 484 return (error); 485 } 486 } 487 opt.uio_iovcnt++; 488 #endif 489 #ifdef INET6 490 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 491 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 492 opt.uio_iovcnt++; 493 optiov[opt.uio_iovcnt].iov_base = u_ip6; 494 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 495 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 496 if (error) { 497 free(u_path, M_TEMP); 498 return (error); 499 } 500 opt.uio_iovcnt++; 501 #endif 502 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]), 503 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 504 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 505 free(u_path, M_TEMP); 506 return (error); 507 } 508 509 510 /* 511 * struct jail_set_args { 512 * struct iovec *iovp; 513 * unsigned int iovcnt; 514 * int flags; 515 * }; 516 */ 517 int 518 sys_jail_set(struct thread *td, struct jail_set_args *uap) 519 { 520 struct uio *auio; 521 int error; 522 523 /* Check that we have an even number of iovecs. */ 524 if (uap->iovcnt & 1) 525 return (EINVAL); 526 527 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 528 if (error) 529 return (error); 530 error = kern_jail_set(td, auio, uap->flags); 531 free(auio, M_IOV); 532 return (error); 533 } 534 535 int 536 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 537 { 538 struct nameidata nd; 539 #ifdef INET 540 struct in_addr *ip4; 541 #endif 542 #ifdef INET6 543 struct in6_addr *ip6; 544 #endif 545 struct vfsopt *opt; 546 struct vfsoptlist *opts; 547 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 548 struct vnode *root; 549 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 550 char *g_path, *osrelstr; 551 #if defined(INET) || defined(INET6) 552 struct prison *tppr; 553 void *op; 554 #endif 555 unsigned long hid; 556 size_t namelen, onamelen; 557 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos; 558 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 559 int fi, jid, jsys, len, level; 560 int childmax, osreldt, rsnum, slevel; 561 int fullpath_disabled; 562 #if defined(INET) || defined(INET6) 563 int ii, ij; 564 #endif 565 #ifdef INET 566 int ip4s, redo_ip4; 567 #endif 568 #ifdef INET6 569 int ip6s, redo_ip6; 570 #endif 571 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 572 unsigned tallow; 573 char numbuf[12]; 574 575 error = priv_check(td, PRIV_JAIL_SET); 576 if (!error && (flags & JAIL_ATTACH)) 577 error = priv_check(td, PRIV_JAIL_ATTACH); 578 if (error) 579 return (error); 580 mypr = ppr = td->td_ucred->cr_prison; 581 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 582 return (EPERM); 583 if (flags & ~JAIL_SET_MASK) 584 return (EINVAL); 585 586 /* 587 * Check all the parameters before committing to anything. Not all 588 * errors can be caught early, but we may as well try. Also, this 589 * takes care of some expensive stuff (path lookup) before getting 590 * the allprison lock. 591 * 592 * XXX Jails are not filesystems, and jail parameters are not mount 593 * options. But it makes more sense to re-use the vfsopt code 594 * than duplicate it under a different name. 595 */ 596 error = vfs_buildopts(optuio, &opts); 597 if (error) 598 return (error); 599 #ifdef INET 600 ip4 = NULL; 601 #endif 602 #ifdef INET6 603 ip6 = NULL; 604 #endif 605 g_path = NULL; 606 607 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 608 if (error == ENOENT) 609 jid = 0; 610 else if (error != 0) 611 goto done_free; 612 613 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 614 if (error == ENOENT) 615 gotslevel = 0; 616 else if (error != 0) 617 goto done_free; 618 else 619 gotslevel = 1; 620 621 error = 622 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 623 if (error == ENOENT) 624 gotchildmax = 0; 625 else if (error != 0) 626 goto done_free; 627 else 628 gotchildmax = 1; 629 630 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 631 if (error == ENOENT) 632 gotenforce = 0; 633 else if (error != 0) 634 goto done_free; 635 else if (enforce < 0 || enforce > 2) { 636 error = EINVAL; 637 goto done_free; 638 } else 639 gotenforce = 1; 640 641 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 642 if (error == ENOENT) 643 gotrsnum = 0; 644 else if (error != 0) 645 goto done_free; 646 else 647 gotrsnum = 1; 648 649 pr_flags = ch_flags = 0; 650 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 651 fi++) { 652 if (pr_flag_names[fi] == NULL) 653 continue; 654 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 655 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 656 } 657 ch_flags |= pr_flags; 658 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 659 fi++) { 660 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 661 sizeof(jsys)); 662 if (error == ENOENT) 663 continue; 664 if (error != 0) 665 goto done_free; 666 switch (jsys) { 667 case JAIL_SYS_DISABLE: 668 if (!pr_flag_jailsys[fi].disable) { 669 error = EINVAL; 670 goto done_free; 671 } 672 pr_flags |= pr_flag_jailsys[fi].disable; 673 break; 674 case JAIL_SYS_NEW: 675 pr_flags |= pr_flag_jailsys[fi].new; 676 break; 677 case JAIL_SYS_INHERIT: 678 break; 679 default: 680 error = EINVAL; 681 goto done_free; 682 } 683 ch_flags |= 684 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 685 } 686 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 687 && !(pr_flags & PR_PERSIST)) { 688 error = EINVAL; 689 vfs_opterror(opts, "new jail must persist or attach"); 690 goto done_errmsg; 691 } 692 #ifdef VIMAGE 693 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 694 error = EINVAL; 695 vfs_opterror(opts, "vnet cannot be changed after creation"); 696 goto done_errmsg; 697 } 698 #endif 699 #ifdef INET 700 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 701 error = EINVAL; 702 vfs_opterror(opts, "ip4 cannot be changed after creation"); 703 goto done_errmsg; 704 } 705 #endif 706 #ifdef INET6 707 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 708 error = EINVAL; 709 vfs_opterror(opts, "ip6 cannot be changed after creation"); 710 goto done_errmsg; 711 } 712 #endif 713 714 pr_allow = ch_allow = 0; 715 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 716 fi++) { 717 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 718 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 719 } 720 ch_allow |= pr_allow; 721 722 error = vfs_getopt(opts, "name", (void **)&name, &len); 723 if (error == ENOENT) 724 name = NULL; 725 else if (error != 0) 726 goto done_free; 727 else { 728 if (len == 0 || name[len - 1] != '\0') { 729 error = EINVAL; 730 goto done_free; 731 } 732 if (len > MAXHOSTNAMELEN) { 733 error = ENAMETOOLONG; 734 goto done_free; 735 } 736 } 737 738 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 739 if (error == ENOENT) 740 host = NULL; 741 else if (error != 0) 742 goto done_free; 743 else { 744 ch_flags |= PR_HOST; 745 pr_flags |= PR_HOST; 746 if (len == 0 || host[len - 1] != '\0') { 747 error = EINVAL; 748 goto done_free; 749 } 750 if (len > MAXHOSTNAMELEN) { 751 error = ENAMETOOLONG; 752 goto done_free; 753 } 754 } 755 756 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 757 if (error == ENOENT) 758 domain = NULL; 759 else if (error != 0) 760 goto done_free; 761 else { 762 ch_flags |= PR_HOST; 763 pr_flags |= PR_HOST; 764 if (len == 0 || domain[len - 1] != '\0') { 765 error = EINVAL; 766 goto done_free; 767 } 768 if (len > MAXHOSTNAMELEN) { 769 error = ENAMETOOLONG; 770 goto done_free; 771 } 772 } 773 774 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 775 if (error == ENOENT) 776 uuid = NULL; 777 else if (error != 0) 778 goto done_free; 779 else { 780 ch_flags |= PR_HOST; 781 pr_flags |= PR_HOST; 782 if (len == 0 || uuid[len - 1] != '\0') { 783 error = EINVAL; 784 goto done_free; 785 } 786 if (len > HOSTUUIDLEN) { 787 error = ENAMETOOLONG; 788 goto done_free; 789 } 790 } 791 792 #ifdef COMPAT_FREEBSD32 793 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 794 uint32_t hid32; 795 796 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 797 hid = hid32; 798 } else 799 #endif 800 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 801 if (error == ENOENT) 802 gothid = 0; 803 else if (error != 0) 804 goto done_free; 805 else { 806 gothid = 1; 807 ch_flags |= PR_HOST; 808 pr_flags |= PR_HOST; 809 } 810 811 #ifdef INET 812 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 813 if (error == ENOENT) 814 ip4s = 0; 815 else if (error != 0) 816 goto done_free; 817 else if (ip4s & (sizeof(*ip4) - 1)) { 818 error = EINVAL; 819 goto done_free; 820 } else { 821 ch_flags |= PR_IP4_USER; 822 pr_flags |= PR_IP4_USER; 823 if (ip4s > 0) { 824 ip4s /= sizeof(*ip4); 825 if (ip4s > jail_max_af_ips) { 826 error = EINVAL; 827 vfs_opterror(opts, "too many IPv4 addresses"); 828 goto done_errmsg; 829 } 830 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 831 bcopy(op, ip4, ip4s * sizeof(*ip4)); 832 /* 833 * IP addresses are all sorted but ip[0] to preserve 834 * the primary IP address as given from userland. 835 * This special IP is used for unbound outgoing 836 * connections as well for "loopback" traffic in case 837 * source address selection cannot find any more fitting 838 * address to connect from. 839 */ 840 if (ip4s > 1) 841 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4); 842 /* 843 * Check for duplicate addresses and do some simple 844 * zero and broadcast checks. If users give other bogus 845 * addresses it is their problem. 846 * 847 * We do not have to care about byte order for these 848 * checks so we will do them in NBO. 849 */ 850 for (ii = 0; ii < ip4s; ii++) { 851 if (ip4[ii].s_addr == INADDR_ANY || 852 ip4[ii].s_addr == INADDR_BROADCAST) { 853 error = EINVAL; 854 goto done_free; 855 } 856 if ((ii+1) < ip4s && 857 (ip4[0].s_addr == ip4[ii+1].s_addr || 858 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 859 error = EINVAL; 860 goto done_free; 861 } 862 } 863 } 864 } 865 #endif 866 867 #ifdef INET6 868 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 869 if (error == ENOENT) 870 ip6s = 0; 871 else if (error != 0) 872 goto done_free; 873 else if (ip6s & (sizeof(*ip6) - 1)) { 874 error = EINVAL; 875 goto done_free; 876 } else { 877 ch_flags |= PR_IP6_USER; 878 pr_flags |= PR_IP6_USER; 879 if (ip6s > 0) { 880 ip6s /= sizeof(*ip6); 881 if (ip6s > jail_max_af_ips) { 882 error = EINVAL; 883 vfs_opterror(opts, "too many IPv6 addresses"); 884 goto done_errmsg; 885 } 886 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 887 bcopy(op, ip6, ip6s * sizeof(*ip6)); 888 if (ip6s > 1) 889 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6); 890 for (ii = 0; ii < ip6s; ii++) { 891 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 892 error = EINVAL; 893 goto done_free; 894 } 895 if ((ii+1) < ip6s && 896 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 897 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 898 { 899 error = EINVAL; 900 goto done_free; 901 } 902 } 903 } 904 } 905 #endif 906 907 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 908 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 909 error = EINVAL; 910 vfs_opterror(opts, 911 "vnet jails cannot have IP address restrictions"); 912 goto done_errmsg; 913 } 914 #endif 915 916 fullpath_disabled = 0; 917 root = NULL; 918 error = vfs_getopt(opts, "path", (void **)&path, &len); 919 if (error == ENOENT) 920 path = NULL; 921 else if (error != 0) 922 goto done_free; 923 else { 924 if (flags & JAIL_UPDATE) { 925 error = EINVAL; 926 vfs_opterror(opts, 927 "path cannot be changed after creation"); 928 goto done_errmsg; 929 } 930 if (len == 0 || path[len - 1] != '\0') { 931 error = EINVAL; 932 goto done_free; 933 } 934 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 935 path, td); 936 error = namei(&nd); 937 if (error) 938 goto done_free; 939 root = nd.ni_vp; 940 NDFREE(&nd, NDF_ONLY_PNBUF); 941 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 942 strlcpy(g_path, path, MAXPATHLEN); 943 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 944 if (error == 0) 945 path = g_path; 946 else if (error == ENODEV) { 947 /* proceed if sysctl debug.disablefullpath == 1 */ 948 fullpath_disabled = 1; 949 if (len < 2 || (len == 2 && path[0] == '/')) 950 path = NULL; 951 } else { 952 /* exit on other errors */ 953 goto done_free; 954 } 955 if (root->v_type != VDIR) { 956 error = ENOTDIR; 957 vput(root); 958 goto done_free; 959 } 960 VOP_UNLOCK(root, 0); 961 if (fullpath_disabled) { 962 /* Leave room for a real-root full pathname. */ 963 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 964 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 965 error = ENAMETOOLONG; 966 goto done_free; 967 } 968 } 969 } 970 971 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 972 if (error == ENOENT) 973 osrelstr = NULL; 974 else if (error != 0) 975 goto done_free; 976 else { 977 if (flags & JAIL_UPDATE) { 978 error = EINVAL; 979 vfs_opterror(opts, 980 "osrelease cannot be changed after creation"); 981 goto done_errmsg; 982 } 983 if (len == 0 || len >= OSRELEASELEN) { 984 error = EINVAL; 985 vfs_opterror(opts, 986 "osrelease string must be 1-%d bytes long", 987 OSRELEASELEN - 1); 988 goto done_errmsg; 989 } 990 } 991 992 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 993 if (error == ENOENT) 994 osreldt = 0; 995 else if (error != 0) 996 goto done_free; 997 else { 998 if (flags & JAIL_UPDATE) { 999 error = EINVAL; 1000 vfs_opterror(opts, 1001 "osreldate cannot be changed after creation"); 1002 goto done_errmsg; 1003 } 1004 if (osreldt == 0) { 1005 error = EINVAL; 1006 vfs_opterror(opts, "osreldate cannot be 0"); 1007 goto done_errmsg; 1008 } 1009 } 1010 1011 /* 1012 * Grab the allprison lock before letting modules check their 1013 * parameters. Once we have it, do not let go so we'll have a 1014 * consistent view of the OSD list. 1015 */ 1016 sx_xlock(&allprison_lock); 1017 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts); 1018 if (error) 1019 goto done_unlock_list; 1020 1021 /* By now, all parameters should have been noted. */ 1022 TAILQ_FOREACH(opt, opts, link) { 1023 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1024 error = EINVAL; 1025 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1026 goto done_unlock_list; 1027 } 1028 } 1029 1030 /* 1031 * See if we are creating a new record or updating an existing one. 1032 * This abuses the file error codes ENOENT and EEXIST. 1033 */ 1034 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 1035 if (!cuflags) { 1036 error = EINVAL; 1037 vfs_opterror(opts, "no valid operation (create or update)"); 1038 goto done_unlock_list; 1039 } 1040 pr = NULL; 1041 namelc = NULL; 1042 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 1043 namelc = strrchr(name, '.'); 1044 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 1045 if (*p != '\0') 1046 jid = 0; 1047 } 1048 if (jid != 0) { 1049 /* 1050 * See if a requested jid already exists. There is an 1051 * information leak here if the jid exists but is not within 1052 * the caller's jail hierarchy. Jail creators will get EEXIST 1053 * even though they cannot see the jail, and CREATE | UPDATE 1054 * will return ENOENT which is not normally a valid error. 1055 */ 1056 if (jid < 0) { 1057 error = EINVAL; 1058 vfs_opterror(opts, "negative jid"); 1059 goto done_unlock_list; 1060 } 1061 pr = prison_find(jid); 1062 if (pr != NULL) { 1063 ppr = pr->pr_parent; 1064 /* Create: jid must not exist. */ 1065 if (cuflags == JAIL_CREATE) { 1066 mtx_unlock(&pr->pr_mtx); 1067 error = EEXIST; 1068 vfs_opterror(opts, "jail %d already exists", 1069 jid); 1070 goto done_unlock_list; 1071 } 1072 if (!prison_ischild(mypr, pr)) { 1073 mtx_unlock(&pr->pr_mtx); 1074 pr = NULL; 1075 } else if (pr->pr_uref == 0) { 1076 if (!(flags & JAIL_DYING)) { 1077 mtx_unlock(&pr->pr_mtx); 1078 error = ENOENT; 1079 vfs_opterror(opts, "jail %d is dying", 1080 jid); 1081 goto done_unlock_list; 1082 } else if ((flags & JAIL_ATTACH) || 1083 (pr_flags & PR_PERSIST)) { 1084 /* 1085 * A dying jail might be resurrected 1086 * (via attach or persist), but first 1087 * it must determine if another jail 1088 * has claimed its name. Accomplish 1089 * this by implicitly re-setting the 1090 * name. 1091 */ 1092 if (name == NULL) 1093 name = prison_name(mypr, pr); 1094 } 1095 } 1096 } 1097 if (pr == NULL) { 1098 /* Update: jid must exist. */ 1099 if (cuflags == JAIL_UPDATE) { 1100 error = ENOENT; 1101 vfs_opterror(opts, "jail %d not found", jid); 1102 goto done_unlock_list; 1103 } 1104 } 1105 } 1106 /* 1107 * If the caller provided a name, look for a jail by that name. 1108 * This has different semantics for creates and updates keyed by jid 1109 * (where the name must not already exist in a different jail), 1110 * and updates keyed by the name itself (where the name must exist 1111 * because that is the jail being updated). 1112 */ 1113 if (name != NULL) { 1114 namelc = strrchr(name, '.'); 1115 if (namelc == NULL) 1116 namelc = name; 1117 else { 1118 /* 1119 * This is a hierarchical name. Split it into the 1120 * parent and child names, and make sure the parent 1121 * exists or matches an already found jail. 1122 */ 1123 *namelc = '\0'; 1124 if (pr != NULL) { 1125 if (strncmp(name, ppr->pr_name, namelc - name) 1126 || ppr->pr_name[namelc - name] != '\0') { 1127 mtx_unlock(&pr->pr_mtx); 1128 error = EINVAL; 1129 vfs_opterror(opts, 1130 "cannot change jail's parent"); 1131 goto done_unlock_list; 1132 } 1133 } else { 1134 ppr = prison_find_name(mypr, name); 1135 if (ppr == NULL) { 1136 error = ENOENT; 1137 vfs_opterror(opts, 1138 "jail \"%s\" not found", name); 1139 goto done_unlock_list; 1140 } 1141 mtx_unlock(&ppr->pr_mtx); 1142 } 1143 name = ++namelc; 1144 } 1145 if (name[0] != '\0') { 1146 namelen = 1147 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1148 name_again: 1149 deadpr = NULL; 1150 FOREACH_PRISON_CHILD(ppr, tpr) { 1151 if (tpr != pr && tpr->pr_ref > 0 && 1152 !strcmp(tpr->pr_name + namelen, name)) { 1153 if (pr == NULL && 1154 cuflags != JAIL_CREATE) { 1155 mtx_lock(&tpr->pr_mtx); 1156 if (tpr->pr_ref > 0) { 1157 /* 1158 * Use this jail 1159 * for updates. 1160 */ 1161 if (tpr->pr_uref > 0) { 1162 pr = tpr; 1163 break; 1164 } 1165 deadpr = tpr; 1166 } 1167 mtx_unlock(&tpr->pr_mtx); 1168 } else if (tpr->pr_uref > 0) { 1169 /* 1170 * Create, or update(jid): 1171 * name must not exist in an 1172 * active sibling jail. 1173 */ 1174 error = EEXIST; 1175 if (pr != NULL) 1176 mtx_unlock(&pr->pr_mtx); 1177 vfs_opterror(opts, 1178 "jail \"%s\" already exists", 1179 name); 1180 goto done_unlock_list; 1181 } 1182 } 1183 } 1184 /* If no active jail is found, use a dying one. */ 1185 if (deadpr != NULL && pr == NULL) { 1186 if (flags & JAIL_DYING) { 1187 mtx_lock(&deadpr->pr_mtx); 1188 if (deadpr->pr_ref == 0) { 1189 mtx_unlock(&deadpr->pr_mtx); 1190 goto name_again; 1191 } 1192 pr = deadpr; 1193 } else if (cuflags == JAIL_UPDATE) { 1194 error = ENOENT; 1195 vfs_opterror(opts, 1196 "jail \"%s\" is dying", name); 1197 goto done_unlock_list; 1198 } 1199 } 1200 /* Update: name must exist if no jid. */ 1201 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1202 error = ENOENT; 1203 vfs_opterror(opts, "jail \"%s\" not found", 1204 name); 1205 goto done_unlock_list; 1206 } 1207 } 1208 } 1209 /* Update: must provide a jid or name. */ 1210 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1211 error = ENOENT; 1212 vfs_opterror(opts, "update specified no jail"); 1213 goto done_unlock_list; 1214 } 1215 1216 /* If there's no prison to update, create a new one and link it in. */ 1217 if (pr == NULL) { 1218 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1219 if (tpr->pr_childcount >= tpr->pr_childmax) { 1220 error = EPERM; 1221 vfs_opterror(opts, "prison limit exceeded"); 1222 goto done_unlock_list; 1223 } 1224 created = 1; 1225 mtx_lock(&ppr->pr_mtx); 1226 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) { 1227 mtx_unlock(&ppr->pr_mtx); 1228 error = ENOENT; 1229 vfs_opterror(opts, "parent jail went away!"); 1230 goto done_unlock_list; 1231 } 1232 ppr->pr_ref++; 1233 ppr->pr_uref++; 1234 mtx_unlock(&ppr->pr_mtx); 1235 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1236 if (jid == 0) { 1237 /* Find the next free jid. */ 1238 jid = lastprid + 1; 1239 findnext: 1240 if (jid == JAIL_MAX) 1241 jid = 1; 1242 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1243 if (tpr->pr_id < jid) 1244 continue; 1245 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1246 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1247 break; 1248 } 1249 if (jid == lastprid) { 1250 error = EAGAIN; 1251 vfs_opterror(opts, 1252 "no available jail IDs"); 1253 free(pr, M_PRISON); 1254 prison_deref(ppr, PD_DEREF | 1255 PD_DEUREF | PD_LIST_XLOCKED); 1256 goto done_releroot; 1257 } 1258 jid++; 1259 goto findnext; 1260 } 1261 lastprid = jid; 1262 } else { 1263 /* 1264 * The jail already has a jid (that did not yet exist), 1265 * so just find where to insert it. 1266 */ 1267 TAILQ_FOREACH(tpr, &allprison, pr_list) 1268 if (tpr->pr_id >= jid) { 1269 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1270 break; 1271 } 1272 } 1273 if (tpr == NULL) 1274 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1275 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1276 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1277 tpr->pr_childcount++; 1278 1279 pr->pr_parent = ppr; 1280 pr->pr_id = jid; 1281 1282 /* Set some default values, and inherit some from the parent. */ 1283 if (name == NULL) 1284 name = ""; 1285 if (path == NULL) { 1286 path = "/"; 1287 root = mypr->pr_root; 1288 vref(root); 1289 } 1290 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1291 pr->pr_flags |= PR_HOST; 1292 #if defined(INET) || defined(INET6) 1293 #ifdef VIMAGE 1294 if (!(pr_flags & PR_VNET)) 1295 #endif 1296 { 1297 #ifdef INET 1298 if (!(ch_flags & PR_IP4_USER)) 1299 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1300 else if (!(pr_flags & PR_IP4_USER)) { 1301 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1302 if (ppr->pr_ip4 != NULL) { 1303 pr->pr_ip4s = ppr->pr_ip4s; 1304 pr->pr_ip4 = malloc(pr->pr_ip4s * 1305 sizeof(struct in_addr), M_PRISON, 1306 M_WAITOK); 1307 bcopy(ppr->pr_ip4, pr->pr_ip4, 1308 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1309 } 1310 } 1311 #endif 1312 #ifdef INET6 1313 if (!(ch_flags & PR_IP6_USER)) 1314 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1315 else if (!(pr_flags & PR_IP6_USER)) { 1316 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1317 if (ppr->pr_ip6 != NULL) { 1318 pr->pr_ip6s = ppr->pr_ip6s; 1319 pr->pr_ip6 = malloc(pr->pr_ip6s * 1320 sizeof(struct in6_addr), M_PRISON, 1321 M_WAITOK); 1322 bcopy(ppr->pr_ip6, pr->pr_ip6, 1323 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1324 } 1325 } 1326 #endif 1327 } 1328 #endif 1329 /* Source address selection is always on by default. */ 1330 pr->pr_flags |= _PR_IP_SADDRSEL; 1331 1332 pr->pr_securelevel = ppr->pr_securelevel; 1333 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1334 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 1335 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1336 1337 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1338 if (osrelstr == NULL) 1339 strcpy(pr->pr_osrelease, ppr->pr_osrelease); 1340 else 1341 strcpy(pr->pr_osrelease, osrelstr); 1342 1343 LIST_INIT(&pr->pr_children); 1344 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1345 1346 #ifdef VIMAGE 1347 /* Allocate a new vnet if specified. */ 1348 pr->pr_vnet = (pr_flags & PR_VNET) 1349 ? vnet_alloc() : ppr->pr_vnet; 1350 #endif 1351 /* 1352 * Allocate a dedicated cpuset for each jail. 1353 * Unlike other initial settings, this may return an erorr. 1354 */ 1355 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1356 if (error) { 1357 prison_deref(pr, PD_LIST_XLOCKED); 1358 goto done_releroot; 1359 } 1360 1361 mtx_lock(&pr->pr_mtx); 1362 /* 1363 * New prisons do not yet have a reference, because we do not 1364 * want other to see the incomplete prison once the 1365 * allprison_lock is downgraded. 1366 */ 1367 } else { 1368 created = 0; 1369 /* 1370 * Grab a reference for existing prisons, to ensure they 1371 * continue to exist for the duration of the call. 1372 */ 1373 pr->pr_ref++; 1374 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1375 if ((pr->pr_flags & PR_VNET) && 1376 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1377 error = EINVAL; 1378 vfs_opterror(opts, 1379 "vnet jails cannot have IP address restrictions"); 1380 goto done_deref_locked; 1381 } 1382 #endif 1383 #ifdef INET 1384 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1385 error = EINVAL; 1386 vfs_opterror(opts, 1387 "ip4 cannot be changed after creation"); 1388 goto done_deref_locked; 1389 } 1390 #endif 1391 #ifdef INET6 1392 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1393 error = EINVAL; 1394 vfs_opterror(opts, 1395 "ip6 cannot be changed after creation"); 1396 goto done_deref_locked; 1397 } 1398 #endif 1399 } 1400 1401 /* Do final error checking before setting anything. */ 1402 if (gotslevel) { 1403 if (slevel < ppr->pr_securelevel) { 1404 error = EPERM; 1405 goto done_deref_locked; 1406 } 1407 } 1408 if (gotchildmax) { 1409 if (childmax >= ppr->pr_childmax) { 1410 error = EPERM; 1411 goto done_deref_locked; 1412 } 1413 } 1414 if (gotenforce) { 1415 if (enforce < ppr->pr_enforce_statfs) { 1416 error = EPERM; 1417 goto done_deref_locked; 1418 } 1419 } 1420 if (gotrsnum) { 1421 /* 1422 * devfs_rsnum is a uint16_t 1423 */ 1424 if (rsnum < 0 || rsnum > 65535) { 1425 error = EINVAL; 1426 goto done_deref_locked; 1427 } 1428 /* 1429 * Nested jails always inherit parent's devfs ruleset 1430 */ 1431 if (jailed(td->td_ucred)) { 1432 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1433 error = EPERM; 1434 goto done_deref_locked; 1435 } else 1436 rsnum = ppr->pr_devfs_rsnum; 1437 } 1438 } 1439 #ifdef INET 1440 if (ip4s > 0) { 1441 if (ppr->pr_flags & PR_IP4) { 1442 /* 1443 * Make sure the new set of IP addresses is a 1444 * subset of the parent's list. Don't worry 1445 * about the parent being unlocked, as any 1446 * setting is done with allprison_lock held. 1447 */ 1448 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1449 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1450 break; 1451 if (ij == ppr->pr_ip4s) { 1452 error = EPERM; 1453 goto done_deref_locked; 1454 } 1455 if (ip4s > 1) { 1456 for (ii = ij = 1; ii < ip4s; ii++) { 1457 if (ip4[ii].s_addr == 1458 ppr->pr_ip4[0].s_addr) 1459 continue; 1460 for (; ij < ppr->pr_ip4s; ij++) 1461 if (ip4[ii].s_addr == 1462 ppr->pr_ip4[ij].s_addr) 1463 break; 1464 if (ij == ppr->pr_ip4s) 1465 break; 1466 } 1467 if (ij == ppr->pr_ip4s) { 1468 error = EPERM; 1469 goto done_deref_locked; 1470 } 1471 } 1472 } 1473 /* 1474 * Check for conflicting IP addresses. We permit them 1475 * if there is no more than one IP on each jail. If 1476 * there is a duplicate on a jail with more than one 1477 * IP stop checking and return error. 1478 */ 1479 tppr = ppr; 1480 #ifdef VIMAGE 1481 for (; tppr != &prison0; tppr = tppr->pr_parent) 1482 if (tppr->pr_flags & PR_VNET) 1483 break; 1484 #endif 1485 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1486 if (tpr == pr || 1487 #ifdef VIMAGE 1488 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1489 #endif 1490 tpr->pr_uref == 0) { 1491 descend = 0; 1492 continue; 1493 } 1494 if (!(tpr->pr_flags & PR_IP4_USER)) 1495 continue; 1496 descend = 0; 1497 if (tpr->pr_ip4 == NULL || 1498 (ip4s == 1 && tpr->pr_ip4s == 1)) 1499 continue; 1500 for (ii = 0; ii < ip4s; ii++) { 1501 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1502 error = EADDRINUSE; 1503 vfs_opterror(opts, 1504 "IPv4 addresses clash"); 1505 goto done_deref_locked; 1506 } 1507 } 1508 } 1509 } 1510 #endif 1511 #ifdef INET6 1512 if (ip6s > 0) { 1513 if (ppr->pr_flags & PR_IP6) { 1514 /* 1515 * Make sure the new set of IP addresses is a 1516 * subset of the parent's list. 1517 */ 1518 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1519 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1520 &ppr->pr_ip6[ij])) 1521 break; 1522 if (ij == ppr->pr_ip6s) { 1523 error = EPERM; 1524 goto done_deref_locked; 1525 } 1526 if (ip6s > 1) { 1527 for (ii = ij = 1; ii < ip6s; ii++) { 1528 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1529 &ppr->pr_ip6[0])) 1530 continue; 1531 for (; ij < ppr->pr_ip6s; ij++) 1532 if (IN6_ARE_ADDR_EQUAL( 1533 &ip6[ii], &ppr->pr_ip6[ij])) 1534 break; 1535 if (ij == ppr->pr_ip6s) 1536 break; 1537 } 1538 if (ij == ppr->pr_ip6s) { 1539 error = EPERM; 1540 goto done_deref_locked; 1541 } 1542 } 1543 } 1544 /* Check for conflicting IP addresses. */ 1545 tppr = ppr; 1546 #ifdef VIMAGE 1547 for (; tppr != &prison0; tppr = tppr->pr_parent) 1548 if (tppr->pr_flags & PR_VNET) 1549 break; 1550 #endif 1551 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1552 if (tpr == pr || 1553 #ifdef VIMAGE 1554 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1555 #endif 1556 tpr->pr_uref == 0) { 1557 descend = 0; 1558 continue; 1559 } 1560 if (!(tpr->pr_flags & PR_IP6_USER)) 1561 continue; 1562 descend = 0; 1563 if (tpr->pr_ip6 == NULL || 1564 (ip6s == 1 && tpr->pr_ip6s == 1)) 1565 continue; 1566 for (ii = 0; ii < ip6s; ii++) { 1567 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1568 error = EADDRINUSE; 1569 vfs_opterror(opts, 1570 "IPv6 addresses clash"); 1571 goto done_deref_locked; 1572 } 1573 } 1574 } 1575 } 1576 #endif 1577 onamelen = namelen = 0; 1578 if (name != NULL) { 1579 /* Give a default name of the jid. */ 1580 if (name[0] == '\0') 1581 snprintf(name = numbuf, sizeof(numbuf), "%d", jid); 1582 else if (*namelc == '0' || (strtoul(namelc, &p, 10) != jid && 1583 *p == '\0')) { 1584 error = EINVAL; 1585 vfs_opterror(opts, 1586 "name cannot be numeric (unless it is the jid)"); 1587 goto done_deref_locked; 1588 } 1589 /* 1590 * Make sure the name isn't too long for the prison or its 1591 * children. 1592 */ 1593 onamelen = strlen(pr->pr_name); 1594 namelen = strlen(name); 1595 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) { 1596 error = ENAMETOOLONG; 1597 goto done_deref_locked; 1598 } 1599 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1600 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1601 sizeof(pr->pr_name)) { 1602 error = ENAMETOOLONG; 1603 goto done_deref_locked; 1604 } 1605 } 1606 } 1607 if (pr_allow & ~ppr->pr_allow) { 1608 error = EPERM; 1609 goto done_deref_locked; 1610 } 1611 1612 /* Set the parameters of the prison. */ 1613 #ifdef INET 1614 redo_ip4 = 0; 1615 if (pr_flags & PR_IP4_USER) { 1616 pr->pr_flags |= PR_IP4; 1617 free(pr->pr_ip4, M_PRISON); 1618 pr->pr_ip4s = ip4s; 1619 pr->pr_ip4 = ip4; 1620 ip4 = NULL; 1621 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1622 #ifdef VIMAGE 1623 if (tpr->pr_flags & PR_VNET) { 1624 descend = 0; 1625 continue; 1626 } 1627 #endif 1628 if (prison_restrict_ip4(tpr, NULL)) { 1629 redo_ip4 = 1; 1630 descend = 0; 1631 } 1632 } 1633 } 1634 #endif 1635 #ifdef INET6 1636 redo_ip6 = 0; 1637 if (pr_flags & PR_IP6_USER) { 1638 pr->pr_flags |= PR_IP6; 1639 free(pr->pr_ip6, M_PRISON); 1640 pr->pr_ip6s = ip6s; 1641 pr->pr_ip6 = ip6; 1642 ip6 = NULL; 1643 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1644 #ifdef VIMAGE 1645 if (tpr->pr_flags & PR_VNET) { 1646 descend = 0; 1647 continue; 1648 } 1649 #endif 1650 if (prison_restrict_ip6(tpr, NULL)) { 1651 redo_ip6 = 1; 1652 descend = 0; 1653 } 1654 } 1655 } 1656 #endif 1657 if (gotslevel) { 1658 pr->pr_securelevel = slevel; 1659 /* Set all child jails to be at least this level. */ 1660 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1661 if (tpr->pr_securelevel < slevel) 1662 tpr->pr_securelevel = slevel; 1663 } 1664 if (gotchildmax) { 1665 pr->pr_childmax = childmax; 1666 /* Set all child jails to under this limit. */ 1667 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1668 if (tpr->pr_childmax > childmax - level) 1669 tpr->pr_childmax = childmax > level 1670 ? childmax - level : 0; 1671 } 1672 if (gotenforce) { 1673 pr->pr_enforce_statfs = enforce; 1674 /* Pass this restriction on to the children. */ 1675 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1676 if (tpr->pr_enforce_statfs < enforce) 1677 tpr->pr_enforce_statfs = enforce; 1678 } 1679 if (gotrsnum) { 1680 pr->pr_devfs_rsnum = rsnum; 1681 /* Pass this restriction on to the children. */ 1682 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1683 tpr->pr_devfs_rsnum = rsnum; 1684 } 1685 if (name != NULL) { 1686 if (ppr == &prison0) 1687 strlcpy(pr->pr_name, name, sizeof(pr->pr_name)); 1688 else 1689 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1690 ppr->pr_name, name); 1691 /* Change this component of child names. */ 1692 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1693 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1694 strlen(tpr->pr_name + onamelen) + 1); 1695 bcopy(pr->pr_name, tpr->pr_name, namelen); 1696 } 1697 } 1698 if (path != NULL) { 1699 /* Try to keep a real-rooted full pathname. */ 1700 if (fullpath_disabled && path[0] == '/' && 1701 strcmp(mypr->pr_path, "/")) 1702 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1703 mypr->pr_path, path); 1704 else 1705 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1706 pr->pr_root = root; 1707 } 1708 if (PR_HOST & ch_flags & ~pr_flags) { 1709 if (pr->pr_flags & PR_HOST) { 1710 /* 1711 * Copy the parent's host info. As with pr_ip4 above, 1712 * the lack of a lock on the parent is not a problem; 1713 * it is always set with allprison_lock at least 1714 * shared, and is held exclusively here. 1715 */ 1716 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1717 sizeof(pr->pr_hostname)); 1718 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1719 sizeof(pr->pr_domainname)); 1720 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1721 sizeof(pr->pr_hostuuid)); 1722 pr->pr_hostid = pr->pr_parent->pr_hostid; 1723 } 1724 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1725 /* Set this prison, and any descendants without PR_HOST. */ 1726 if (host != NULL) 1727 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1728 if (domain != NULL) 1729 strlcpy(pr->pr_domainname, domain, 1730 sizeof(pr->pr_domainname)); 1731 if (uuid != NULL) 1732 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1733 if (gothid) 1734 pr->pr_hostid = hid; 1735 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1736 if (tpr->pr_flags & PR_HOST) 1737 descend = 0; 1738 else { 1739 if (host != NULL) 1740 strlcpy(tpr->pr_hostname, 1741 pr->pr_hostname, 1742 sizeof(tpr->pr_hostname)); 1743 if (domain != NULL) 1744 strlcpy(tpr->pr_domainname, 1745 pr->pr_domainname, 1746 sizeof(tpr->pr_domainname)); 1747 if (uuid != NULL) 1748 strlcpy(tpr->pr_hostuuid, 1749 pr->pr_hostuuid, 1750 sizeof(tpr->pr_hostuuid)); 1751 if (gothid) 1752 tpr->pr_hostid = hid; 1753 } 1754 } 1755 } 1756 if ((tallow = ch_allow & ~pr_allow)) { 1757 /* Clear allow bits in all children. */ 1758 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1759 tpr->pr_allow &= ~tallow; 1760 } 1761 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1762 /* 1763 * Persistent prisons get an extra reference, and prisons losing their 1764 * persist flag lose that reference. Only do this for existing prisons 1765 * for now, so new ones will remain unseen until after the module 1766 * handlers have completed. 1767 */ 1768 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1769 if (pr_flags & PR_PERSIST) { 1770 pr->pr_ref++; 1771 pr->pr_uref++; 1772 } else { 1773 pr->pr_ref--; 1774 pr->pr_uref--; 1775 } 1776 } 1777 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1778 mtx_unlock(&pr->pr_mtx); 1779 1780 #ifdef RACCT 1781 if (created) 1782 prison_racct_attach(pr); 1783 #endif 1784 1785 /* Locks may have prevented a complete restriction of child IP 1786 * addresses. If so, allocate some more memory and try again. 1787 */ 1788 #ifdef INET 1789 while (redo_ip4) { 1790 ip4s = pr->pr_ip4s; 1791 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1792 mtx_lock(&pr->pr_mtx); 1793 redo_ip4 = 0; 1794 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1795 #ifdef VIMAGE 1796 if (tpr->pr_flags & PR_VNET) { 1797 descend = 0; 1798 continue; 1799 } 1800 #endif 1801 if (prison_restrict_ip4(tpr, ip4)) { 1802 if (ip4 != NULL) 1803 ip4 = NULL; 1804 else 1805 redo_ip4 = 1; 1806 } 1807 } 1808 mtx_unlock(&pr->pr_mtx); 1809 } 1810 #endif 1811 #ifdef INET6 1812 while (redo_ip6) { 1813 ip6s = pr->pr_ip6s; 1814 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1815 mtx_lock(&pr->pr_mtx); 1816 redo_ip6 = 0; 1817 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1818 #ifdef VIMAGE 1819 if (tpr->pr_flags & PR_VNET) { 1820 descend = 0; 1821 continue; 1822 } 1823 #endif 1824 if (prison_restrict_ip6(tpr, ip6)) { 1825 if (ip6 != NULL) 1826 ip6 = NULL; 1827 else 1828 redo_ip6 = 1; 1829 } 1830 } 1831 mtx_unlock(&pr->pr_mtx); 1832 } 1833 #endif 1834 1835 /* Let the modules do their work. */ 1836 sx_downgrade(&allprison_lock); 1837 if (created) { 1838 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1839 if (error) { 1840 prison_deref(pr, PD_LIST_SLOCKED); 1841 goto done_errmsg; 1842 } 1843 } 1844 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1845 if (error) { 1846 prison_deref(pr, created 1847 ? PD_LIST_SLOCKED 1848 : PD_DEREF | PD_LIST_SLOCKED); 1849 goto done_errmsg; 1850 } 1851 1852 /* Attach this process to the prison if requested. */ 1853 if (flags & JAIL_ATTACH) { 1854 mtx_lock(&pr->pr_mtx); 1855 error = do_jail_attach(td, pr); 1856 if (error) { 1857 vfs_opterror(opts, "attach failed"); 1858 if (!created) 1859 prison_deref(pr, PD_DEREF); 1860 goto done_errmsg; 1861 } 1862 } 1863 1864 #ifdef RACCT 1865 if (!created) { 1866 if (!(flags & JAIL_ATTACH)) 1867 sx_sunlock(&allprison_lock); 1868 prison_racct_modify(pr); 1869 if (!(flags & JAIL_ATTACH)) 1870 sx_slock(&allprison_lock); 1871 } 1872 #endif 1873 1874 td->td_retval[0] = pr->pr_id; 1875 1876 /* 1877 * Now that it is all there, drop the temporary reference from existing 1878 * prisons. Or add a reference to newly created persistent prisons 1879 * (which was not done earlier so that the prison would not be publicly 1880 * visible). 1881 */ 1882 if (!created) { 1883 prison_deref(pr, (flags & JAIL_ATTACH) 1884 ? PD_DEREF 1885 : PD_DEREF | PD_LIST_SLOCKED); 1886 } else { 1887 if (pr_flags & PR_PERSIST) { 1888 mtx_lock(&pr->pr_mtx); 1889 pr->pr_ref++; 1890 pr->pr_uref++; 1891 mtx_unlock(&pr->pr_mtx); 1892 } 1893 if (!(flags & JAIL_ATTACH)) 1894 sx_sunlock(&allprison_lock); 1895 } 1896 1897 goto done_errmsg; 1898 1899 done_deref_locked: 1900 prison_deref(pr, created 1901 ? PD_LOCKED | PD_LIST_XLOCKED 1902 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1903 goto done_releroot; 1904 done_unlock_list: 1905 sx_xunlock(&allprison_lock); 1906 done_releroot: 1907 if (root != NULL) 1908 vrele(root); 1909 done_errmsg: 1910 if (error) { 1911 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1912 if (errmsg_len > 0) { 1913 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1914 if (errmsg_pos > 0) { 1915 if (optuio->uio_segflg == UIO_SYSSPACE) 1916 bcopy(errmsg, 1917 optuio->uio_iov[errmsg_pos].iov_base, 1918 errmsg_len); 1919 else 1920 copyout(errmsg, 1921 optuio->uio_iov[errmsg_pos].iov_base, 1922 errmsg_len); 1923 } 1924 } 1925 } 1926 done_free: 1927 #ifdef INET 1928 free(ip4, M_PRISON); 1929 #endif 1930 #ifdef INET6 1931 free(ip6, M_PRISON); 1932 #endif 1933 if (g_path != NULL) 1934 free(g_path, M_TEMP); 1935 vfs_freeopts(opts); 1936 return (error); 1937 } 1938 1939 1940 /* 1941 * struct jail_get_args { 1942 * struct iovec *iovp; 1943 * unsigned int iovcnt; 1944 * int flags; 1945 * }; 1946 */ 1947 int 1948 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1949 { 1950 struct uio *auio; 1951 int error; 1952 1953 /* Check that we have an even number of iovecs. */ 1954 if (uap->iovcnt & 1) 1955 return (EINVAL); 1956 1957 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1958 if (error) 1959 return (error); 1960 error = kern_jail_get(td, auio, uap->flags); 1961 if (error == 0) 1962 error = copyout(auio->uio_iov, uap->iovp, 1963 uap->iovcnt * sizeof (struct iovec)); 1964 free(auio, M_IOV); 1965 return (error); 1966 } 1967 1968 int 1969 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1970 { 1971 struct prison *pr, *mypr; 1972 struct vfsopt *opt; 1973 struct vfsoptlist *opts; 1974 char *errmsg, *name; 1975 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1976 1977 if (flags & ~JAIL_GET_MASK) 1978 return (EINVAL); 1979 1980 /* Get the parameter list. */ 1981 error = vfs_buildopts(optuio, &opts); 1982 if (error) 1983 return (error); 1984 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1985 mypr = td->td_ucred->cr_prison; 1986 1987 /* 1988 * Find the prison specified by one of: lastjid, jid, name. 1989 */ 1990 sx_slock(&allprison_lock); 1991 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1992 if (error == 0) { 1993 TAILQ_FOREACH(pr, &allprison, pr_list) { 1994 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1995 mtx_lock(&pr->pr_mtx); 1996 if (pr->pr_ref > 0 && 1997 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1998 break; 1999 mtx_unlock(&pr->pr_mtx); 2000 } 2001 } 2002 if (pr != NULL) 2003 goto found_prison; 2004 error = ENOENT; 2005 vfs_opterror(opts, "no jail after %d", jid); 2006 goto done_unlock_list; 2007 } else if (error != ENOENT) 2008 goto done_unlock_list; 2009 2010 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 2011 if (error == 0) { 2012 if (jid != 0) { 2013 pr = prison_find_child(mypr, jid); 2014 if (pr != NULL) { 2015 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2016 mtx_unlock(&pr->pr_mtx); 2017 error = ENOENT; 2018 vfs_opterror(opts, "jail %d is dying", 2019 jid); 2020 goto done_unlock_list; 2021 } 2022 goto found_prison; 2023 } 2024 error = ENOENT; 2025 vfs_opterror(opts, "jail %d not found", jid); 2026 goto done_unlock_list; 2027 } 2028 } else if (error != ENOENT) 2029 goto done_unlock_list; 2030 2031 error = vfs_getopt(opts, "name", (void **)&name, &len); 2032 if (error == 0) { 2033 if (len == 0 || name[len - 1] != '\0') { 2034 error = EINVAL; 2035 goto done_unlock_list; 2036 } 2037 pr = prison_find_name(mypr, name); 2038 if (pr != NULL) { 2039 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2040 mtx_unlock(&pr->pr_mtx); 2041 error = ENOENT; 2042 vfs_opterror(opts, "jail \"%s\" is dying", 2043 name); 2044 goto done_unlock_list; 2045 } 2046 goto found_prison; 2047 } 2048 error = ENOENT; 2049 vfs_opterror(opts, "jail \"%s\" not found", name); 2050 goto done_unlock_list; 2051 } else if (error != ENOENT) 2052 goto done_unlock_list; 2053 2054 vfs_opterror(opts, "no jail specified"); 2055 error = ENOENT; 2056 goto done_unlock_list; 2057 2058 found_prison: 2059 /* Get the parameters of the prison. */ 2060 pr->pr_ref++; 2061 locked = PD_LOCKED; 2062 td->td_retval[0] = pr->pr_id; 2063 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2064 if (error != 0 && error != ENOENT) 2065 goto done_deref; 2066 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2067 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2068 if (error != 0 && error != ENOENT) 2069 goto done_deref; 2070 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2071 if (error != 0 && error != ENOENT) 2072 goto done_deref; 2073 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2074 sizeof(pr->pr_cpuset->cs_id)); 2075 if (error != 0 && error != ENOENT) 2076 goto done_deref; 2077 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2078 if (error != 0 && error != ENOENT) 2079 goto done_deref; 2080 #ifdef INET 2081 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2082 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2083 if (error != 0 && error != ENOENT) 2084 goto done_deref; 2085 #endif 2086 #ifdef INET6 2087 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2088 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2089 if (error != 0 && error != ENOENT) 2090 goto done_deref; 2091 #endif 2092 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2093 sizeof(pr->pr_securelevel)); 2094 if (error != 0 && error != ENOENT) 2095 goto done_deref; 2096 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2097 sizeof(pr->pr_childcount)); 2098 if (error != 0 && error != ENOENT) 2099 goto done_deref; 2100 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2101 sizeof(pr->pr_childmax)); 2102 if (error != 0 && error != ENOENT) 2103 goto done_deref; 2104 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2105 if (error != 0 && error != ENOENT) 2106 goto done_deref; 2107 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2108 if (error != 0 && error != ENOENT) 2109 goto done_deref; 2110 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2111 if (error != 0 && error != ENOENT) 2112 goto done_deref; 2113 #ifdef COMPAT_FREEBSD32 2114 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2115 uint32_t hid32 = pr->pr_hostid; 2116 2117 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2118 } else 2119 #endif 2120 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2121 sizeof(pr->pr_hostid)); 2122 if (error != 0 && error != ENOENT) 2123 goto done_deref; 2124 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2125 sizeof(pr->pr_enforce_statfs)); 2126 if (error != 0 && error != ENOENT) 2127 goto done_deref; 2128 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2129 sizeof(pr->pr_devfs_rsnum)); 2130 if (error != 0 && error != ENOENT) 2131 goto done_deref; 2132 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 2133 fi++) { 2134 if (pr_flag_names[fi] == NULL) 2135 continue; 2136 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2137 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2138 if (error != 0 && error != ENOENT) 2139 goto done_deref; 2140 i = !i; 2141 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2142 if (error != 0 && error != ENOENT) 2143 goto done_deref; 2144 } 2145 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 2146 fi++) { 2147 i = pr->pr_flags & 2148 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2149 i = pr_flag_jailsys[fi].disable && 2150 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2151 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2152 : JAIL_SYS_INHERIT; 2153 error = 2154 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2155 if (error != 0 && error != ENOENT) 2156 goto done_deref; 2157 } 2158 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 2159 fi++) { 2160 if (pr_allow_names[fi] == NULL) 2161 continue; 2162 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2163 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2164 if (error != 0 && error != ENOENT) 2165 goto done_deref; 2166 i = !i; 2167 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2168 if (error != 0 && error != ENOENT) 2169 goto done_deref; 2170 } 2171 i = (pr->pr_uref == 0); 2172 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2173 if (error != 0 && error != ENOENT) 2174 goto done_deref; 2175 i = !i; 2176 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2177 if (error != 0 && error != ENOENT) 2178 goto done_deref; 2179 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2180 sizeof(pr->pr_osreldate)); 2181 if (error != 0 && error != ENOENT) 2182 goto done_deref; 2183 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2184 if (error != 0 && error != ENOENT) 2185 goto done_deref; 2186 2187 /* Get the module parameters. */ 2188 mtx_unlock(&pr->pr_mtx); 2189 locked = 0; 2190 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2191 if (error) 2192 goto done_deref; 2193 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2194 2195 /* By now, all parameters should have been noted. */ 2196 TAILQ_FOREACH(opt, opts, link) { 2197 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2198 error = EINVAL; 2199 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2200 goto done_errmsg; 2201 } 2202 } 2203 2204 /* Write the fetched parameters back to userspace. */ 2205 error = 0; 2206 TAILQ_FOREACH(opt, opts, link) { 2207 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2208 pos = 2 * opt->pos + 1; 2209 optuio->uio_iov[pos].iov_len = opt->len; 2210 if (opt->value != NULL) { 2211 if (optuio->uio_segflg == UIO_SYSSPACE) { 2212 bcopy(opt->value, 2213 optuio->uio_iov[pos].iov_base, 2214 opt->len); 2215 } else { 2216 error = copyout(opt->value, 2217 optuio->uio_iov[pos].iov_base, 2218 opt->len); 2219 if (error) 2220 break; 2221 } 2222 } 2223 } 2224 } 2225 goto done_errmsg; 2226 2227 done_deref: 2228 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2229 goto done_errmsg; 2230 2231 done_unlock_list: 2232 sx_sunlock(&allprison_lock); 2233 done_errmsg: 2234 if (error && errmsg_pos >= 0) { 2235 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2236 errmsg_pos = 2 * errmsg_pos + 1; 2237 if (errmsg_len > 0) { 2238 if (optuio->uio_segflg == UIO_SYSSPACE) 2239 bcopy(errmsg, 2240 optuio->uio_iov[errmsg_pos].iov_base, 2241 errmsg_len); 2242 else 2243 copyout(errmsg, 2244 optuio->uio_iov[errmsg_pos].iov_base, 2245 errmsg_len); 2246 } 2247 } 2248 vfs_freeopts(opts); 2249 return (error); 2250 } 2251 2252 2253 /* 2254 * struct jail_remove_args { 2255 * int jid; 2256 * }; 2257 */ 2258 int 2259 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2260 { 2261 struct prison *pr, *cpr, *lpr, *tpr; 2262 int descend, error; 2263 2264 error = priv_check(td, PRIV_JAIL_REMOVE); 2265 if (error) 2266 return (error); 2267 2268 sx_xlock(&allprison_lock); 2269 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2270 if (pr == NULL) { 2271 sx_xunlock(&allprison_lock); 2272 return (EINVAL); 2273 } 2274 2275 /* Remove all descendants of this prison, then remove this prison. */ 2276 pr->pr_ref++; 2277 pr->pr_flags |= PR_REMOVE; 2278 if (!LIST_EMPTY(&pr->pr_children)) { 2279 mtx_unlock(&pr->pr_mtx); 2280 lpr = NULL; 2281 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2282 mtx_lock(&cpr->pr_mtx); 2283 if (cpr->pr_ref > 0) { 2284 tpr = cpr; 2285 cpr->pr_ref++; 2286 cpr->pr_flags |= PR_REMOVE; 2287 } else { 2288 /* Already removed - do not do it again. */ 2289 tpr = NULL; 2290 } 2291 mtx_unlock(&cpr->pr_mtx); 2292 if (lpr != NULL) { 2293 mtx_lock(&lpr->pr_mtx); 2294 prison_remove_one(lpr); 2295 sx_xlock(&allprison_lock); 2296 } 2297 lpr = tpr; 2298 } 2299 if (lpr != NULL) { 2300 mtx_lock(&lpr->pr_mtx); 2301 prison_remove_one(lpr); 2302 sx_xlock(&allprison_lock); 2303 } 2304 mtx_lock(&pr->pr_mtx); 2305 } 2306 prison_remove_one(pr); 2307 return (0); 2308 } 2309 2310 static void 2311 prison_remove_one(struct prison *pr) 2312 { 2313 struct proc *p; 2314 int deuref; 2315 2316 /* If the prison was persistent, it is not anymore. */ 2317 deuref = 0; 2318 if (pr->pr_flags & PR_PERSIST) { 2319 pr->pr_ref--; 2320 deuref = PD_DEUREF; 2321 pr->pr_flags &= ~PR_PERSIST; 2322 } 2323 2324 /* 2325 * jail_remove added a reference. If that's the only one, remove 2326 * the prison now. 2327 */ 2328 KASSERT(pr->pr_ref > 0, 2329 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2330 if (pr->pr_ref == 1) { 2331 prison_deref(pr, 2332 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2333 return; 2334 } 2335 2336 mtx_unlock(&pr->pr_mtx); 2337 sx_xunlock(&allprison_lock); 2338 /* 2339 * Kill all processes unfortunate enough to be attached to this prison. 2340 */ 2341 sx_slock(&allproc_lock); 2342 LIST_FOREACH(p, &allproc, p_list) { 2343 PROC_LOCK(p); 2344 if (p->p_state != PRS_NEW && p->p_ucred && 2345 p->p_ucred->cr_prison == pr) 2346 kern_psignal(p, SIGKILL); 2347 PROC_UNLOCK(p); 2348 } 2349 sx_sunlock(&allproc_lock); 2350 /* Remove the temporary reference added by jail_remove. */ 2351 prison_deref(pr, deuref | PD_DEREF); 2352 } 2353 2354 2355 /* 2356 * struct jail_attach_args { 2357 * int jid; 2358 * }; 2359 */ 2360 int 2361 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2362 { 2363 struct prison *pr; 2364 int error; 2365 2366 error = priv_check(td, PRIV_JAIL_ATTACH); 2367 if (error) 2368 return (error); 2369 2370 sx_slock(&allprison_lock); 2371 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2372 if (pr == NULL) { 2373 sx_sunlock(&allprison_lock); 2374 return (EINVAL); 2375 } 2376 2377 /* 2378 * Do not allow a process to attach to a prison that is not 2379 * considered to be "alive". 2380 */ 2381 if (pr->pr_uref == 0) { 2382 mtx_unlock(&pr->pr_mtx); 2383 sx_sunlock(&allprison_lock); 2384 return (EINVAL); 2385 } 2386 2387 return (do_jail_attach(td, pr)); 2388 } 2389 2390 static int 2391 do_jail_attach(struct thread *td, struct prison *pr) 2392 { 2393 struct prison *ppr; 2394 struct proc *p; 2395 struct ucred *newcred, *oldcred; 2396 int error; 2397 2398 /* 2399 * XXX: Note that there is a slight race here if two threads 2400 * in the same privileged process attempt to attach to two 2401 * different jails at the same time. It is important for 2402 * user processes not to do this, or they might end up with 2403 * a process root from one prison, but attached to the jail 2404 * of another. 2405 */ 2406 pr->pr_ref++; 2407 pr->pr_uref++; 2408 mtx_unlock(&pr->pr_mtx); 2409 2410 /* Let modules do whatever they need to prepare for attaching. */ 2411 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2412 if (error) { 2413 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2414 return (error); 2415 } 2416 sx_sunlock(&allprison_lock); 2417 2418 /* 2419 * Reparent the newly attached process to this jail. 2420 */ 2421 ppr = td->td_ucred->cr_prison; 2422 p = td->td_proc; 2423 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2424 if (error) 2425 goto e_revert_osd; 2426 2427 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2428 if ((error = change_dir(pr->pr_root, td)) != 0) 2429 goto e_unlock; 2430 #ifdef MAC 2431 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2432 goto e_unlock; 2433 #endif 2434 VOP_UNLOCK(pr->pr_root, 0); 2435 if ((error = change_root(pr->pr_root, td))) 2436 goto e_revert_osd; 2437 2438 newcred = crget(); 2439 PROC_LOCK(p); 2440 oldcred = p->p_ucred; 2441 setsugid(p); 2442 crcopy(newcred, oldcred); 2443 newcred->cr_prison = pr; 2444 proc_set_cred(p, newcred); 2445 PROC_UNLOCK(p); 2446 #ifdef RACCT 2447 racct_proc_ucred_changed(p, oldcred, newcred); 2448 #endif 2449 crfree(oldcred); 2450 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2451 return (0); 2452 e_unlock: 2453 VOP_UNLOCK(pr->pr_root, 0); 2454 e_revert_osd: 2455 /* Tell modules this thread is still in its old jail after all. */ 2456 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2457 prison_deref(pr, PD_DEREF | PD_DEUREF); 2458 return (error); 2459 } 2460 2461 2462 /* 2463 * Returns a locked prison instance, or NULL on failure. 2464 */ 2465 struct prison * 2466 prison_find(int prid) 2467 { 2468 struct prison *pr; 2469 2470 sx_assert(&allprison_lock, SX_LOCKED); 2471 TAILQ_FOREACH(pr, &allprison, pr_list) { 2472 if (pr->pr_id == prid) { 2473 mtx_lock(&pr->pr_mtx); 2474 if (pr->pr_ref > 0) 2475 return (pr); 2476 mtx_unlock(&pr->pr_mtx); 2477 } 2478 } 2479 return (NULL); 2480 } 2481 2482 /* 2483 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2484 */ 2485 struct prison * 2486 prison_find_child(struct prison *mypr, int prid) 2487 { 2488 struct prison *pr; 2489 int descend; 2490 2491 sx_assert(&allprison_lock, SX_LOCKED); 2492 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2493 if (pr->pr_id == prid) { 2494 mtx_lock(&pr->pr_mtx); 2495 if (pr->pr_ref > 0) 2496 return (pr); 2497 mtx_unlock(&pr->pr_mtx); 2498 } 2499 } 2500 return (NULL); 2501 } 2502 2503 /* 2504 * Look for the name relative to mypr. Returns a locked prison or NULL. 2505 */ 2506 struct prison * 2507 prison_find_name(struct prison *mypr, const char *name) 2508 { 2509 struct prison *pr, *deadpr; 2510 size_t mylen; 2511 int descend; 2512 2513 sx_assert(&allprison_lock, SX_LOCKED); 2514 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2515 again: 2516 deadpr = NULL; 2517 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2518 if (!strcmp(pr->pr_name + mylen, name)) { 2519 mtx_lock(&pr->pr_mtx); 2520 if (pr->pr_ref > 0) { 2521 if (pr->pr_uref > 0) 2522 return (pr); 2523 deadpr = pr; 2524 } 2525 mtx_unlock(&pr->pr_mtx); 2526 } 2527 } 2528 /* There was no valid prison - perhaps there was a dying one. */ 2529 if (deadpr != NULL) { 2530 mtx_lock(&deadpr->pr_mtx); 2531 if (deadpr->pr_ref == 0) { 2532 mtx_unlock(&deadpr->pr_mtx); 2533 goto again; 2534 } 2535 } 2536 return (deadpr); 2537 } 2538 2539 /* 2540 * See if a prison has the specific flag set. 2541 */ 2542 int 2543 prison_flag(struct ucred *cred, unsigned flag) 2544 { 2545 2546 /* This is an atomic read, so no locking is necessary. */ 2547 return (cred->cr_prison->pr_flags & flag); 2548 } 2549 2550 int 2551 prison_allow(struct ucred *cred, unsigned flag) 2552 { 2553 2554 /* This is an atomic read, so no locking is necessary. */ 2555 return (cred->cr_prison->pr_allow & flag); 2556 } 2557 2558 /* 2559 * Remove a prison reference. If that was the last reference, remove the 2560 * prison itself - but not in this context in case there are locks held. 2561 */ 2562 void 2563 prison_free_locked(struct prison *pr) 2564 { 2565 2566 mtx_assert(&pr->pr_mtx, MA_OWNED); 2567 pr->pr_ref--; 2568 if (pr->pr_ref == 0) { 2569 mtx_unlock(&pr->pr_mtx); 2570 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2571 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2572 return; 2573 } 2574 mtx_unlock(&pr->pr_mtx); 2575 } 2576 2577 void 2578 prison_free(struct prison *pr) 2579 { 2580 2581 mtx_lock(&pr->pr_mtx); 2582 prison_free_locked(pr); 2583 } 2584 2585 static void 2586 prison_complete(void *context, int pending) 2587 { 2588 2589 prison_deref((struct prison *)context, 0); 2590 } 2591 2592 /* 2593 * Remove a prison reference (usually). This internal version assumes no 2594 * mutexes are held, except perhaps the prison itself. If there are no more 2595 * references, release and delist the prison. On completion, the prison lock 2596 * and the allprison lock are both unlocked. 2597 */ 2598 static void 2599 prison_deref(struct prison *pr, int flags) 2600 { 2601 struct prison *ppr, *tpr; 2602 2603 if (!(flags & PD_LOCKED)) 2604 mtx_lock(&pr->pr_mtx); 2605 for (;;) { 2606 if (flags & PD_DEUREF) { 2607 pr->pr_uref--; 2608 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2609 } 2610 if (flags & PD_DEREF) 2611 pr->pr_ref--; 2612 /* If the prison still has references, nothing else to do. */ 2613 if (pr->pr_ref > 0) { 2614 mtx_unlock(&pr->pr_mtx); 2615 if (flags & PD_LIST_SLOCKED) 2616 sx_sunlock(&allprison_lock); 2617 else if (flags & PD_LIST_XLOCKED) 2618 sx_xunlock(&allprison_lock); 2619 return; 2620 } 2621 2622 mtx_unlock(&pr->pr_mtx); 2623 if (flags & PD_LIST_SLOCKED) { 2624 if (!sx_try_upgrade(&allprison_lock)) { 2625 sx_sunlock(&allprison_lock); 2626 sx_xlock(&allprison_lock); 2627 } 2628 } else if (!(flags & PD_LIST_XLOCKED)) 2629 sx_xlock(&allprison_lock); 2630 2631 TAILQ_REMOVE(&allprison, pr, pr_list); 2632 LIST_REMOVE(pr, pr_sibling); 2633 ppr = pr->pr_parent; 2634 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2635 tpr->pr_childcount--; 2636 sx_xunlock(&allprison_lock); 2637 2638 #ifdef VIMAGE 2639 if (pr->pr_vnet != ppr->pr_vnet) 2640 vnet_destroy(pr->pr_vnet); 2641 #endif 2642 if (pr->pr_root != NULL) 2643 vrele(pr->pr_root); 2644 mtx_destroy(&pr->pr_mtx); 2645 #ifdef INET 2646 free(pr->pr_ip4, M_PRISON); 2647 #endif 2648 #ifdef INET6 2649 free(pr->pr_ip6, M_PRISON); 2650 #endif 2651 if (pr->pr_cpuset != NULL) 2652 cpuset_rel(pr->pr_cpuset); 2653 osd_jail_exit(pr); 2654 #ifdef RACCT 2655 prison_racct_detach(pr); 2656 #endif 2657 free(pr, M_PRISON); 2658 2659 /* Removing a prison frees a reference on its parent. */ 2660 pr = ppr; 2661 mtx_lock(&pr->pr_mtx); 2662 flags = PD_DEREF | PD_DEUREF; 2663 } 2664 } 2665 2666 void 2667 prison_hold_locked(struct prison *pr) 2668 { 2669 2670 mtx_assert(&pr->pr_mtx, MA_OWNED); 2671 KASSERT(pr->pr_ref > 0, 2672 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2673 pr->pr_ref++; 2674 } 2675 2676 void 2677 prison_hold(struct prison *pr) 2678 { 2679 2680 mtx_lock(&pr->pr_mtx); 2681 prison_hold_locked(pr); 2682 mtx_unlock(&pr->pr_mtx); 2683 } 2684 2685 void 2686 prison_proc_hold(struct prison *pr) 2687 { 2688 2689 mtx_lock(&pr->pr_mtx); 2690 KASSERT(pr->pr_uref > 0, 2691 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2692 pr->pr_uref++; 2693 mtx_unlock(&pr->pr_mtx); 2694 } 2695 2696 void 2697 prison_proc_free(struct prison *pr) 2698 { 2699 2700 mtx_lock(&pr->pr_mtx); 2701 KASSERT(pr->pr_uref > 0, 2702 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2703 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2704 } 2705 2706 2707 #ifdef INET 2708 /* 2709 * Restrict a prison's IP address list with its parent's, possibly replacing 2710 * it. Return true if the replacement buffer was used (or would have been). 2711 */ 2712 static int 2713 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2714 { 2715 int ii, ij, used; 2716 struct prison *ppr; 2717 2718 ppr = pr->pr_parent; 2719 if (!(pr->pr_flags & PR_IP4_USER)) { 2720 /* This has no user settings, so just copy the parent's list. */ 2721 if (pr->pr_ip4s < ppr->pr_ip4s) { 2722 /* 2723 * There's no room for the parent's list. Use the 2724 * new list buffer, which is assumed to be big enough 2725 * (if it was passed). If there's no buffer, try to 2726 * allocate one. 2727 */ 2728 used = 1; 2729 if (newip4 == NULL) { 2730 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2731 M_PRISON, M_NOWAIT); 2732 if (newip4 != NULL) 2733 used = 0; 2734 } 2735 if (newip4 != NULL) { 2736 bcopy(ppr->pr_ip4, newip4, 2737 ppr->pr_ip4s * sizeof(*newip4)); 2738 free(pr->pr_ip4, M_PRISON); 2739 pr->pr_ip4 = newip4; 2740 pr->pr_ip4s = ppr->pr_ip4s; 2741 } 2742 return (used); 2743 } 2744 pr->pr_ip4s = ppr->pr_ip4s; 2745 if (pr->pr_ip4s > 0) 2746 bcopy(ppr->pr_ip4, pr->pr_ip4, 2747 pr->pr_ip4s * sizeof(*newip4)); 2748 else if (pr->pr_ip4 != NULL) { 2749 free(pr->pr_ip4, M_PRISON); 2750 pr->pr_ip4 = NULL; 2751 } 2752 } else if (pr->pr_ip4s > 0) { 2753 /* Remove addresses that aren't in the parent. */ 2754 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2755 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2756 break; 2757 if (ij < ppr->pr_ip4s) 2758 ii = 1; 2759 else { 2760 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2761 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2762 ii = 0; 2763 } 2764 for (ij = 1; ii < pr->pr_ip4s; ) { 2765 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2766 ii++; 2767 continue; 2768 } 2769 switch (ij >= ppr->pr_ip4s ? -1 : 2770 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2771 case -1: 2772 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2773 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2774 break; 2775 case 0: 2776 ii++; 2777 ij++; 2778 break; 2779 case 1: 2780 ij++; 2781 break; 2782 } 2783 } 2784 if (pr->pr_ip4s == 0) { 2785 free(pr->pr_ip4, M_PRISON); 2786 pr->pr_ip4 = NULL; 2787 } 2788 } 2789 return (0); 2790 } 2791 2792 /* 2793 * Pass back primary IPv4 address of this jail. 2794 * 2795 * If not restricted return success but do not alter the address. Caller has 2796 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2797 * 2798 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2799 * Address returned in NBO. 2800 */ 2801 int 2802 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2803 { 2804 struct prison *pr; 2805 2806 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2807 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2808 2809 pr = cred->cr_prison; 2810 if (!(pr->pr_flags & PR_IP4)) 2811 return (0); 2812 mtx_lock(&pr->pr_mtx); 2813 if (!(pr->pr_flags & PR_IP4)) { 2814 mtx_unlock(&pr->pr_mtx); 2815 return (0); 2816 } 2817 if (pr->pr_ip4 == NULL) { 2818 mtx_unlock(&pr->pr_mtx); 2819 return (EAFNOSUPPORT); 2820 } 2821 2822 ia->s_addr = pr->pr_ip4[0].s_addr; 2823 mtx_unlock(&pr->pr_mtx); 2824 return (0); 2825 } 2826 2827 /* 2828 * Return 1 if we should do proper source address selection or are not jailed. 2829 * We will return 0 if we should bypass source address selection in favour 2830 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2831 * returned in NBO. 2832 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2833 */ 2834 int 2835 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2836 { 2837 struct prison *pr; 2838 struct in_addr lia; 2839 int error; 2840 2841 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2842 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2843 2844 if (!jailed(cred)) 2845 return (1); 2846 2847 pr = cred->cr_prison; 2848 if (pr->pr_flags & PR_IP4_SADDRSEL) 2849 return (1); 2850 2851 lia.s_addr = INADDR_ANY; 2852 error = prison_get_ip4(cred, &lia); 2853 if (error) 2854 return (error); 2855 if (lia.s_addr == INADDR_ANY) 2856 return (1); 2857 2858 ia->s_addr = lia.s_addr; 2859 return (0); 2860 } 2861 2862 /* 2863 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2864 */ 2865 int 2866 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2867 { 2868 2869 if (pr1 == pr2) 2870 return (1); 2871 2872 /* 2873 * No need to lock since the PR_IP4_USER flag can't be altered for 2874 * existing prisons. 2875 */ 2876 while (pr1 != &prison0 && 2877 #ifdef VIMAGE 2878 !(pr1->pr_flags & PR_VNET) && 2879 #endif 2880 !(pr1->pr_flags & PR_IP4_USER)) 2881 pr1 = pr1->pr_parent; 2882 while (pr2 != &prison0 && 2883 #ifdef VIMAGE 2884 !(pr2->pr_flags & PR_VNET) && 2885 #endif 2886 !(pr2->pr_flags & PR_IP4_USER)) 2887 pr2 = pr2->pr_parent; 2888 return (pr1 == pr2); 2889 } 2890 2891 /* 2892 * Make sure our (source) address is set to something meaningful to this 2893 * jail. 2894 * 2895 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2896 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2897 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2898 */ 2899 int 2900 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2901 { 2902 struct prison *pr; 2903 struct in_addr ia0; 2904 int error; 2905 2906 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2907 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2908 2909 pr = cred->cr_prison; 2910 if (!(pr->pr_flags & PR_IP4)) 2911 return (0); 2912 mtx_lock(&pr->pr_mtx); 2913 if (!(pr->pr_flags & PR_IP4)) { 2914 mtx_unlock(&pr->pr_mtx); 2915 return (0); 2916 } 2917 if (pr->pr_ip4 == NULL) { 2918 mtx_unlock(&pr->pr_mtx); 2919 return (EAFNOSUPPORT); 2920 } 2921 2922 ia0.s_addr = ntohl(ia->s_addr); 2923 if (ia0.s_addr == INADDR_LOOPBACK) { 2924 ia->s_addr = pr->pr_ip4[0].s_addr; 2925 mtx_unlock(&pr->pr_mtx); 2926 return (0); 2927 } 2928 2929 if (ia0.s_addr == INADDR_ANY) { 2930 /* 2931 * In case there is only 1 IPv4 address, bind directly. 2932 */ 2933 if (pr->pr_ip4s == 1) 2934 ia->s_addr = pr->pr_ip4[0].s_addr; 2935 mtx_unlock(&pr->pr_mtx); 2936 return (0); 2937 } 2938 2939 error = _prison_check_ip4(pr, ia); 2940 mtx_unlock(&pr->pr_mtx); 2941 return (error); 2942 } 2943 2944 /* 2945 * Rewrite destination address in case we will connect to loopback address. 2946 * 2947 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2948 * Address passed in in NBO and returned in NBO. 2949 */ 2950 int 2951 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2952 { 2953 struct prison *pr; 2954 2955 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2956 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2957 2958 pr = cred->cr_prison; 2959 if (!(pr->pr_flags & PR_IP4)) 2960 return (0); 2961 mtx_lock(&pr->pr_mtx); 2962 if (!(pr->pr_flags & PR_IP4)) { 2963 mtx_unlock(&pr->pr_mtx); 2964 return (0); 2965 } 2966 if (pr->pr_ip4 == NULL) { 2967 mtx_unlock(&pr->pr_mtx); 2968 return (EAFNOSUPPORT); 2969 } 2970 2971 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2972 ia->s_addr = pr->pr_ip4[0].s_addr; 2973 mtx_unlock(&pr->pr_mtx); 2974 return (0); 2975 } 2976 2977 /* 2978 * Return success because nothing had to be changed. 2979 */ 2980 mtx_unlock(&pr->pr_mtx); 2981 return (0); 2982 } 2983 2984 /* 2985 * Check if given address belongs to the jail referenced by cred/prison. 2986 * 2987 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2988 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2989 * doesn't allow IPv4. Address passed in in NBO. 2990 */ 2991 static int 2992 _prison_check_ip4(const struct prison *pr, const struct in_addr *ia) 2993 { 2994 int i, a, z, d; 2995 2996 /* 2997 * Check the primary IP. 2998 */ 2999 if (pr->pr_ip4[0].s_addr == ia->s_addr) 3000 return (0); 3001 3002 /* 3003 * All the other IPs are sorted so we can do a binary search. 3004 */ 3005 a = 0; 3006 z = pr->pr_ip4s - 2; 3007 while (a <= z) { 3008 i = (a + z) / 2; 3009 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 3010 if (d > 0) 3011 z = i - 1; 3012 else if (d < 0) 3013 a = i + 1; 3014 else 3015 return (0); 3016 } 3017 3018 return (EADDRNOTAVAIL); 3019 } 3020 3021 int 3022 prison_check_ip4(const struct ucred *cred, const struct in_addr *ia) 3023 { 3024 struct prison *pr; 3025 int error; 3026 3027 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3028 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 3029 3030 pr = cred->cr_prison; 3031 if (!(pr->pr_flags & PR_IP4)) 3032 return (0); 3033 mtx_lock(&pr->pr_mtx); 3034 if (!(pr->pr_flags & PR_IP4)) { 3035 mtx_unlock(&pr->pr_mtx); 3036 return (0); 3037 } 3038 if (pr->pr_ip4 == NULL) { 3039 mtx_unlock(&pr->pr_mtx); 3040 return (EAFNOSUPPORT); 3041 } 3042 3043 error = _prison_check_ip4(pr, ia); 3044 mtx_unlock(&pr->pr_mtx); 3045 return (error); 3046 } 3047 #endif 3048 3049 #ifdef INET6 3050 static int 3051 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 3052 { 3053 int ii, ij, used; 3054 struct prison *ppr; 3055 3056 ppr = pr->pr_parent; 3057 if (!(pr->pr_flags & PR_IP6_USER)) { 3058 /* This has no user settings, so just copy the parent's list. */ 3059 if (pr->pr_ip6s < ppr->pr_ip6s) { 3060 /* 3061 * There's no room for the parent's list. Use the 3062 * new list buffer, which is assumed to be big enough 3063 * (if it was passed). If there's no buffer, try to 3064 * allocate one. 3065 */ 3066 used = 1; 3067 if (newip6 == NULL) { 3068 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 3069 M_PRISON, M_NOWAIT); 3070 if (newip6 != NULL) 3071 used = 0; 3072 } 3073 if (newip6 != NULL) { 3074 bcopy(ppr->pr_ip6, newip6, 3075 ppr->pr_ip6s * sizeof(*newip6)); 3076 free(pr->pr_ip6, M_PRISON); 3077 pr->pr_ip6 = newip6; 3078 pr->pr_ip6s = ppr->pr_ip6s; 3079 } 3080 return (used); 3081 } 3082 pr->pr_ip6s = ppr->pr_ip6s; 3083 if (pr->pr_ip6s > 0) 3084 bcopy(ppr->pr_ip6, pr->pr_ip6, 3085 pr->pr_ip6s * sizeof(*newip6)); 3086 else if (pr->pr_ip6 != NULL) { 3087 free(pr->pr_ip6, M_PRISON); 3088 pr->pr_ip6 = NULL; 3089 } 3090 } else if (pr->pr_ip6s > 0) { 3091 /* Remove addresses that aren't in the parent. */ 3092 for (ij = 0; ij < ppr->pr_ip6s; ij++) 3093 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 3094 &ppr->pr_ip6[ij])) 3095 break; 3096 if (ij < ppr->pr_ip6s) 3097 ii = 1; 3098 else { 3099 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 3100 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 3101 ii = 0; 3102 } 3103 for (ij = 1; ii < pr->pr_ip6s; ) { 3104 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 3105 &ppr->pr_ip6[0])) { 3106 ii++; 3107 continue; 3108 } 3109 switch (ij >= ppr->pr_ip6s ? -1 : 3110 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 3111 case -1: 3112 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 3113 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 3114 break; 3115 case 0: 3116 ii++; 3117 ij++; 3118 break; 3119 case 1: 3120 ij++; 3121 break; 3122 } 3123 } 3124 if (pr->pr_ip6s == 0) { 3125 free(pr->pr_ip6, M_PRISON); 3126 pr->pr_ip6 = NULL; 3127 } 3128 } 3129 return 0; 3130 } 3131 3132 /* 3133 * Pass back primary IPv6 address for this jail. 3134 * 3135 * If not restricted return success but do not alter the address. Caller has 3136 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3137 * 3138 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3139 */ 3140 int 3141 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3142 { 3143 struct prison *pr; 3144 3145 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3146 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3147 3148 pr = cred->cr_prison; 3149 if (!(pr->pr_flags & PR_IP6)) 3150 return (0); 3151 mtx_lock(&pr->pr_mtx); 3152 if (!(pr->pr_flags & PR_IP6)) { 3153 mtx_unlock(&pr->pr_mtx); 3154 return (0); 3155 } 3156 if (pr->pr_ip6 == NULL) { 3157 mtx_unlock(&pr->pr_mtx); 3158 return (EAFNOSUPPORT); 3159 } 3160 3161 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3162 mtx_unlock(&pr->pr_mtx); 3163 return (0); 3164 } 3165 3166 /* 3167 * Return 1 if we should do proper source address selection or are not jailed. 3168 * We will return 0 if we should bypass source address selection in favour 3169 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3170 * returned in NBO. 3171 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3172 */ 3173 int 3174 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3175 { 3176 struct prison *pr; 3177 struct in6_addr lia6; 3178 int error; 3179 3180 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3181 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3182 3183 if (!jailed(cred)) 3184 return (1); 3185 3186 pr = cred->cr_prison; 3187 if (pr->pr_flags & PR_IP6_SADDRSEL) 3188 return (1); 3189 3190 lia6 = in6addr_any; 3191 error = prison_get_ip6(cred, &lia6); 3192 if (error) 3193 return (error); 3194 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3195 return (1); 3196 3197 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3198 return (0); 3199 } 3200 3201 /* 3202 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3203 */ 3204 int 3205 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3206 { 3207 3208 if (pr1 == pr2) 3209 return (1); 3210 3211 while (pr1 != &prison0 && 3212 #ifdef VIMAGE 3213 !(pr1->pr_flags & PR_VNET) && 3214 #endif 3215 !(pr1->pr_flags & PR_IP6_USER)) 3216 pr1 = pr1->pr_parent; 3217 while (pr2 != &prison0 && 3218 #ifdef VIMAGE 3219 !(pr2->pr_flags & PR_VNET) && 3220 #endif 3221 !(pr2->pr_flags & PR_IP6_USER)) 3222 pr2 = pr2->pr_parent; 3223 return (pr1 == pr2); 3224 } 3225 3226 /* 3227 * Make sure our (source) address is set to something meaningful to this jail. 3228 * 3229 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3230 * when needed while binding. 3231 * 3232 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3233 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3234 * doesn't allow IPv6. 3235 */ 3236 int 3237 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3238 { 3239 struct prison *pr; 3240 int error; 3241 3242 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3243 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3244 3245 pr = cred->cr_prison; 3246 if (!(pr->pr_flags & PR_IP6)) 3247 return (0); 3248 mtx_lock(&pr->pr_mtx); 3249 if (!(pr->pr_flags & PR_IP6)) { 3250 mtx_unlock(&pr->pr_mtx); 3251 return (0); 3252 } 3253 if (pr->pr_ip6 == NULL) { 3254 mtx_unlock(&pr->pr_mtx); 3255 return (EAFNOSUPPORT); 3256 } 3257 3258 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3259 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3260 mtx_unlock(&pr->pr_mtx); 3261 return (0); 3262 } 3263 3264 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3265 /* 3266 * In case there is only 1 IPv6 address, and v6only is true, 3267 * then bind directly. 3268 */ 3269 if (v6only != 0 && pr->pr_ip6s == 1) 3270 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3271 mtx_unlock(&pr->pr_mtx); 3272 return (0); 3273 } 3274 3275 error = _prison_check_ip6(pr, ia6); 3276 mtx_unlock(&pr->pr_mtx); 3277 return (error); 3278 } 3279 3280 /* 3281 * Rewrite destination address in case we will connect to loopback address. 3282 * 3283 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3284 */ 3285 int 3286 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3287 { 3288 struct prison *pr; 3289 3290 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3291 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3292 3293 pr = cred->cr_prison; 3294 if (!(pr->pr_flags & PR_IP6)) 3295 return (0); 3296 mtx_lock(&pr->pr_mtx); 3297 if (!(pr->pr_flags & PR_IP6)) { 3298 mtx_unlock(&pr->pr_mtx); 3299 return (0); 3300 } 3301 if (pr->pr_ip6 == NULL) { 3302 mtx_unlock(&pr->pr_mtx); 3303 return (EAFNOSUPPORT); 3304 } 3305 3306 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3307 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3308 mtx_unlock(&pr->pr_mtx); 3309 return (0); 3310 } 3311 3312 /* 3313 * Return success because nothing had to be changed. 3314 */ 3315 mtx_unlock(&pr->pr_mtx); 3316 return (0); 3317 } 3318 3319 /* 3320 * Check if given address belongs to the jail referenced by cred/prison. 3321 * 3322 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3323 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3324 * doesn't allow IPv6. 3325 */ 3326 static int 3327 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3328 { 3329 int i, a, z, d; 3330 3331 /* 3332 * Check the primary IP. 3333 */ 3334 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3335 return (0); 3336 3337 /* 3338 * All the other IPs are sorted so we can do a binary search. 3339 */ 3340 a = 0; 3341 z = pr->pr_ip6s - 2; 3342 while (a <= z) { 3343 i = (a + z) / 2; 3344 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3345 if (d > 0) 3346 z = i - 1; 3347 else if (d < 0) 3348 a = i + 1; 3349 else 3350 return (0); 3351 } 3352 3353 return (EADDRNOTAVAIL); 3354 } 3355 3356 int 3357 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3358 { 3359 struct prison *pr; 3360 int error; 3361 3362 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3363 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3364 3365 pr = cred->cr_prison; 3366 if (!(pr->pr_flags & PR_IP6)) 3367 return (0); 3368 mtx_lock(&pr->pr_mtx); 3369 if (!(pr->pr_flags & PR_IP6)) { 3370 mtx_unlock(&pr->pr_mtx); 3371 return (0); 3372 } 3373 if (pr->pr_ip6 == NULL) { 3374 mtx_unlock(&pr->pr_mtx); 3375 return (EAFNOSUPPORT); 3376 } 3377 3378 error = _prison_check_ip6(pr, ia6); 3379 mtx_unlock(&pr->pr_mtx); 3380 return (error); 3381 } 3382 #endif 3383 3384 /* 3385 * Check if a jail supports the given address family. 3386 * 3387 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3388 * if not. 3389 */ 3390 int 3391 prison_check_af(struct ucred *cred, int af) 3392 { 3393 struct prison *pr; 3394 int error; 3395 3396 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3397 3398 pr = cred->cr_prison; 3399 #ifdef VIMAGE 3400 /* Prisons with their own network stack are not limited. */ 3401 if (prison_owns_vnet(cred)) 3402 return (0); 3403 #endif 3404 3405 error = 0; 3406 switch (af) 3407 { 3408 #ifdef INET 3409 case AF_INET: 3410 if (pr->pr_flags & PR_IP4) 3411 { 3412 mtx_lock(&pr->pr_mtx); 3413 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3414 error = EAFNOSUPPORT; 3415 mtx_unlock(&pr->pr_mtx); 3416 } 3417 break; 3418 #endif 3419 #ifdef INET6 3420 case AF_INET6: 3421 if (pr->pr_flags & PR_IP6) 3422 { 3423 mtx_lock(&pr->pr_mtx); 3424 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3425 error = EAFNOSUPPORT; 3426 mtx_unlock(&pr->pr_mtx); 3427 } 3428 break; 3429 #endif 3430 case AF_LOCAL: 3431 case AF_ROUTE: 3432 break; 3433 default: 3434 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3435 error = EAFNOSUPPORT; 3436 } 3437 return (error); 3438 } 3439 3440 /* 3441 * Check if given address belongs to the jail referenced by cred (wrapper to 3442 * prison_check_ip[46]). 3443 * 3444 * Returns 0 if jail doesn't restrict the address family or if address belongs 3445 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3446 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3447 */ 3448 int 3449 prison_if(struct ucred *cred, struct sockaddr *sa) 3450 { 3451 #ifdef INET 3452 struct sockaddr_in *sai; 3453 #endif 3454 #ifdef INET6 3455 struct sockaddr_in6 *sai6; 3456 #endif 3457 int error; 3458 3459 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3460 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3461 3462 #ifdef VIMAGE 3463 if (prison_owns_vnet(cred)) 3464 return (0); 3465 #endif 3466 3467 error = 0; 3468 switch (sa->sa_family) 3469 { 3470 #ifdef INET 3471 case AF_INET: 3472 sai = (struct sockaddr_in *)sa; 3473 error = prison_check_ip4(cred, &sai->sin_addr); 3474 break; 3475 #endif 3476 #ifdef INET6 3477 case AF_INET6: 3478 sai6 = (struct sockaddr_in6 *)sa; 3479 error = prison_check_ip6(cred, &sai6->sin6_addr); 3480 break; 3481 #endif 3482 default: 3483 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3484 error = EAFNOSUPPORT; 3485 } 3486 return (error); 3487 } 3488 3489 /* 3490 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3491 */ 3492 int 3493 prison_check(struct ucred *cred1, struct ucred *cred2) 3494 { 3495 3496 return ((cred1->cr_prison == cred2->cr_prison || 3497 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3498 } 3499 3500 /* 3501 * Return 1 if p2 is a child of p1, otherwise 0. 3502 */ 3503 int 3504 prison_ischild(struct prison *pr1, struct prison *pr2) 3505 { 3506 3507 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3508 if (pr1 == pr2) 3509 return (1); 3510 return (0); 3511 } 3512 3513 /* 3514 * Return 1 if the passed credential is in a jail, otherwise 0. 3515 */ 3516 int 3517 jailed(struct ucred *cred) 3518 { 3519 3520 return (cred->cr_prison != &prison0); 3521 } 3522 3523 /* 3524 * Return 1 if the passed credential is in a jail and that jail does not 3525 * have its own virtual network stack, otherwise 0. 3526 */ 3527 int 3528 jailed_without_vnet(struct ucred *cred) 3529 { 3530 3531 if (!jailed(cred)) 3532 return (0); 3533 #ifdef VIMAGE 3534 if (prison_owns_vnet(cred)) 3535 return (0); 3536 #endif 3537 3538 return (1); 3539 } 3540 3541 /* 3542 * Return the correct hostname (domainname, et al) for the passed credential. 3543 */ 3544 void 3545 getcredhostname(struct ucred *cred, char *buf, size_t size) 3546 { 3547 struct prison *pr; 3548 3549 /* 3550 * A NULL credential can be used to shortcut to the physical 3551 * system's hostname. 3552 */ 3553 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3554 mtx_lock(&pr->pr_mtx); 3555 strlcpy(buf, pr->pr_hostname, size); 3556 mtx_unlock(&pr->pr_mtx); 3557 } 3558 3559 void 3560 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3561 { 3562 3563 mtx_lock(&cred->cr_prison->pr_mtx); 3564 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3565 mtx_unlock(&cred->cr_prison->pr_mtx); 3566 } 3567 3568 void 3569 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3570 { 3571 3572 mtx_lock(&cred->cr_prison->pr_mtx); 3573 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3574 mtx_unlock(&cred->cr_prison->pr_mtx); 3575 } 3576 3577 void 3578 getcredhostid(struct ucred *cred, unsigned long *hostid) 3579 { 3580 3581 mtx_lock(&cred->cr_prison->pr_mtx); 3582 *hostid = cred->cr_prison->pr_hostid; 3583 mtx_unlock(&cred->cr_prison->pr_mtx); 3584 } 3585 3586 #ifdef VIMAGE 3587 /* 3588 * Determine whether the prison represented by cred owns 3589 * its vnet rather than having it inherited. 3590 * 3591 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3592 */ 3593 int 3594 prison_owns_vnet(struct ucred *cred) 3595 { 3596 3597 /* 3598 * vnets cannot be added/removed after jail creation, 3599 * so no need to lock here. 3600 */ 3601 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3602 } 3603 #endif 3604 3605 /* 3606 * Determine whether the subject represented by cred can "see" 3607 * status of a mount point. 3608 * Returns: 0 for permitted, ENOENT otherwise. 3609 * XXX: This function should be called cr_canseemount() and should be 3610 * placed in kern_prot.c. 3611 */ 3612 int 3613 prison_canseemount(struct ucred *cred, struct mount *mp) 3614 { 3615 struct prison *pr; 3616 struct statfs *sp; 3617 size_t len; 3618 3619 pr = cred->cr_prison; 3620 if (pr->pr_enforce_statfs == 0) 3621 return (0); 3622 if (pr->pr_root->v_mount == mp) 3623 return (0); 3624 if (pr->pr_enforce_statfs == 2) 3625 return (ENOENT); 3626 /* 3627 * If jail's chroot directory is set to "/" we should be able to see 3628 * all mount-points from inside a jail. 3629 * This is ugly check, but this is the only situation when jail's 3630 * directory ends with '/'. 3631 */ 3632 if (strcmp(pr->pr_path, "/") == 0) 3633 return (0); 3634 len = strlen(pr->pr_path); 3635 sp = &mp->mnt_stat; 3636 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3637 return (ENOENT); 3638 /* 3639 * Be sure that we don't have situation where jail's root directory 3640 * is "/some/path" and mount point is "/some/pathpath". 3641 */ 3642 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3643 return (ENOENT); 3644 return (0); 3645 } 3646 3647 void 3648 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3649 { 3650 char jpath[MAXPATHLEN]; 3651 struct prison *pr; 3652 size_t len; 3653 3654 pr = cred->cr_prison; 3655 if (pr->pr_enforce_statfs == 0) 3656 return; 3657 if (prison_canseemount(cred, mp) != 0) { 3658 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3659 strlcpy(sp->f_mntonname, "[restricted]", 3660 sizeof(sp->f_mntonname)); 3661 return; 3662 } 3663 if (pr->pr_root->v_mount == mp) { 3664 /* 3665 * Clear current buffer data, so we are sure nothing from 3666 * the valid path left there. 3667 */ 3668 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3669 *sp->f_mntonname = '/'; 3670 return; 3671 } 3672 /* 3673 * If jail's chroot directory is set to "/" we should be able to see 3674 * all mount-points from inside a jail. 3675 */ 3676 if (strcmp(pr->pr_path, "/") == 0) 3677 return; 3678 len = strlen(pr->pr_path); 3679 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3680 /* 3681 * Clear current buffer data, so we are sure nothing from 3682 * the valid path left there. 3683 */ 3684 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3685 if (*jpath == '\0') { 3686 /* Should never happen. */ 3687 *sp->f_mntonname = '/'; 3688 } else { 3689 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3690 } 3691 } 3692 3693 /* 3694 * Check with permission for a specific privilege is granted within jail. We 3695 * have a specific list of accepted privileges; the rest are denied. 3696 */ 3697 int 3698 prison_priv_check(struct ucred *cred, int priv) 3699 { 3700 3701 if (!jailed(cred)) 3702 return (0); 3703 3704 #ifdef VIMAGE 3705 /* 3706 * Privileges specific to prisons with a virtual network stack. 3707 * There might be a duplicate entry here in case the privilege 3708 * is only granted conditionally in the legacy jail case. 3709 */ 3710 switch (priv) { 3711 #ifdef notyet 3712 /* 3713 * NFS-specific privileges. 3714 */ 3715 case PRIV_NFS_DAEMON: 3716 case PRIV_NFS_LOCKD: 3717 #endif 3718 /* 3719 * Network stack privileges. 3720 */ 3721 case PRIV_NET_BRIDGE: 3722 case PRIV_NET_GRE: 3723 case PRIV_NET_BPF: 3724 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3725 case PRIV_NET_ROUTE: 3726 case PRIV_NET_TAP: 3727 case PRIV_NET_SETIFMTU: 3728 case PRIV_NET_SETIFFLAGS: 3729 case PRIV_NET_SETIFCAP: 3730 case PRIV_NET_SETIFDESCR: 3731 case PRIV_NET_SETIFNAME : 3732 case PRIV_NET_SETIFMETRIC: 3733 case PRIV_NET_SETIFPHYS: 3734 case PRIV_NET_SETIFMAC: 3735 case PRIV_NET_ADDMULTI: 3736 case PRIV_NET_DELMULTI: 3737 case PRIV_NET_HWIOCTL: 3738 case PRIV_NET_SETLLADDR: 3739 case PRIV_NET_ADDIFGROUP: 3740 case PRIV_NET_DELIFGROUP: 3741 case PRIV_NET_IFCREATE: 3742 case PRIV_NET_IFDESTROY: 3743 case PRIV_NET_ADDIFADDR: 3744 case PRIV_NET_DELIFADDR: 3745 case PRIV_NET_LAGG: 3746 case PRIV_NET_GIF: 3747 case PRIV_NET_SETIFVNET: 3748 case PRIV_NET_SETIFFIB: 3749 3750 /* 3751 * 802.11-related privileges. 3752 */ 3753 case PRIV_NET80211_GETKEY: 3754 #ifdef notyet 3755 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3756 #endif 3757 3758 #ifdef notyet 3759 /* 3760 * ATM privileges. 3761 */ 3762 case PRIV_NETATM_CFG: 3763 case PRIV_NETATM_ADD: 3764 case PRIV_NETATM_DEL: 3765 case PRIV_NETATM_SET: 3766 3767 /* 3768 * Bluetooth privileges. 3769 */ 3770 case PRIV_NETBLUETOOTH_RAW: 3771 #endif 3772 3773 /* 3774 * Netgraph and netgraph module privileges. 3775 */ 3776 case PRIV_NETGRAPH_CONTROL: 3777 #ifdef notyet 3778 case PRIV_NETGRAPH_TTY: 3779 #endif 3780 3781 /* 3782 * IPv4 and IPv6 privileges. 3783 */ 3784 case PRIV_NETINET_IPFW: 3785 case PRIV_NETINET_DIVERT: 3786 case PRIV_NETINET_PF: 3787 case PRIV_NETINET_DUMMYNET: 3788 case PRIV_NETINET_CARP: 3789 case PRIV_NETINET_MROUTE: 3790 case PRIV_NETINET_RAW: 3791 case PRIV_NETINET_ADDRCTRL6: 3792 case PRIV_NETINET_ND6: 3793 case PRIV_NETINET_SCOPE6: 3794 case PRIV_NETINET_ALIFETIME6: 3795 case PRIV_NETINET_IPSEC: 3796 case PRIV_NETINET_BINDANY: 3797 3798 #ifdef notyet 3799 /* 3800 * NCP privileges. 3801 */ 3802 case PRIV_NETNCP: 3803 3804 /* 3805 * SMB privileges. 3806 */ 3807 case PRIV_NETSMB: 3808 #endif 3809 3810 /* 3811 * No default: or deny here. 3812 * In case of no permit fall through to next switch(). 3813 */ 3814 if (cred->cr_prison->pr_flags & PR_VNET) 3815 return (0); 3816 } 3817 #endif /* VIMAGE */ 3818 3819 switch (priv) { 3820 3821 /* 3822 * Allow ktrace privileges for root in jail. 3823 */ 3824 case PRIV_KTRACE: 3825 3826 #if 0 3827 /* 3828 * Allow jailed processes to configure audit identity and 3829 * submit audit records (login, etc). In the future we may 3830 * want to further refine the relationship between audit and 3831 * jail. 3832 */ 3833 case PRIV_AUDIT_GETAUDIT: 3834 case PRIV_AUDIT_SETAUDIT: 3835 case PRIV_AUDIT_SUBMIT: 3836 #endif 3837 3838 /* 3839 * Allow jailed processes to manipulate process UNIX 3840 * credentials in any way they see fit. 3841 */ 3842 case PRIV_CRED_SETUID: 3843 case PRIV_CRED_SETEUID: 3844 case PRIV_CRED_SETGID: 3845 case PRIV_CRED_SETEGID: 3846 case PRIV_CRED_SETGROUPS: 3847 case PRIV_CRED_SETREUID: 3848 case PRIV_CRED_SETREGID: 3849 case PRIV_CRED_SETRESUID: 3850 case PRIV_CRED_SETRESGID: 3851 3852 /* 3853 * Jail implements visibility constraints already, so allow 3854 * jailed root to override uid/gid-based constraints. 3855 */ 3856 case PRIV_SEEOTHERGIDS: 3857 case PRIV_SEEOTHERUIDS: 3858 3859 /* 3860 * Jail implements inter-process debugging limits already, so 3861 * allow jailed root various debugging privileges. 3862 */ 3863 case PRIV_DEBUG_DIFFCRED: 3864 case PRIV_DEBUG_SUGID: 3865 case PRIV_DEBUG_UNPRIV: 3866 3867 /* 3868 * Allow jail to set various resource limits and login 3869 * properties, and for now, exceed process resource limits. 3870 */ 3871 case PRIV_PROC_LIMIT: 3872 case PRIV_PROC_SETLOGIN: 3873 case PRIV_PROC_SETRLIMIT: 3874 3875 /* 3876 * System V and POSIX IPC privileges are granted in jail. 3877 */ 3878 case PRIV_IPC_READ: 3879 case PRIV_IPC_WRITE: 3880 case PRIV_IPC_ADMIN: 3881 case PRIV_IPC_MSGSIZE: 3882 case PRIV_MQ_ADMIN: 3883 3884 /* 3885 * Jail operations within a jail work on child jails. 3886 */ 3887 case PRIV_JAIL_ATTACH: 3888 case PRIV_JAIL_SET: 3889 case PRIV_JAIL_REMOVE: 3890 3891 /* 3892 * Jail implements its own inter-process limits, so allow 3893 * root processes in jail to change scheduling on other 3894 * processes in the same jail. Likewise for signalling. 3895 */ 3896 case PRIV_SCHED_DIFFCRED: 3897 case PRIV_SCHED_CPUSET: 3898 case PRIV_SIGNAL_DIFFCRED: 3899 case PRIV_SIGNAL_SUGID: 3900 3901 /* 3902 * Allow jailed processes to write to sysctls marked as jail 3903 * writable. 3904 */ 3905 case PRIV_SYSCTL_WRITEJAIL: 3906 3907 /* 3908 * Allow root in jail to manage a variety of quota 3909 * properties. These should likely be conditional on a 3910 * configuration option. 3911 */ 3912 case PRIV_VFS_GETQUOTA: 3913 case PRIV_VFS_SETQUOTA: 3914 3915 /* 3916 * Since Jail relies on chroot() to implement file system 3917 * protections, grant many VFS privileges to root in jail. 3918 * Be careful to exclude mount-related and NFS-related 3919 * privileges. 3920 */ 3921 case PRIV_VFS_READ: 3922 case PRIV_VFS_WRITE: 3923 case PRIV_VFS_ADMIN: 3924 case PRIV_VFS_EXEC: 3925 case PRIV_VFS_LOOKUP: 3926 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3927 case PRIV_VFS_CHFLAGS_DEV: 3928 case PRIV_VFS_CHOWN: 3929 case PRIV_VFS_CHROOT: 3930 case PRIV_VFS_RETAINSUGID: 3931 case PRIV_VFS_FCHROOT: 3932 case PRIV_VFS_LINK: 3933 case PRIV_VFS_SETGID: 3934 case PRIV_VFS_STAT: 3935 case PRIV_VFS_STICKYFILE: 3936 3937 /* 3938 * As in the non-jail case, non-root users are expected to be 3939 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3940 * exists in the jail and they have permission to access it). 3941 */ 3942 case PRIV_KMEM_READ: 3943 return (0); 3944 3945 /* 3946 * Depending on the global setting, allow privilege of 3947 * setting system flags. 3948 */ 3949 case PRIV_VFS_SYSFLAGS: 3950 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3951 return (0); 3952 else 3953 return (EPERM); 3954 3955 /* 3956 * Depending on the global setting, allow privilege of 3957 * mounting/unmounting file systems. 3958 */ 3959 case PRIV_VFS_MOUNT: 3960 case PRIV_VFS_UNMOUNT: 3961 case PRIV_VFS_MOUNT_NONUSER: 3962 case PRIV_VFS_MOUNT_OWNER: 3963 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3964 cred->cr_prison->pr_enforce_statfs < 2) 3965 return (0); 3966 else 3967 return (EPERM); 3968 3969 /* 3970 * Allow jailed root to bind reserved ports and reuse in-use 3971 * ports. 3972 */ 3973 case PRIV_NETINET_RESERVEDPORT: 3974 case PRIV_NETINET_REUSEPORT: 3975 return (0); 3976 3977 /* 3978 * Allow jailed root to set certian IPv4/6 (option) headers. 3979 */ 3980 case PRIV_NETINET_SETHDROPTS: 3981 return (0); 3982 3983 /* 3984 * Conditionally allow creating raw sockets in jail. 3985 */ 3986 case PRIV_NETINET_RAW: 3987 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3988 return (0); 3989 else 3990 return (EPERM); 3991 3992 /* 3993 * Since jail implements its own visibility limits on netstat 3994 * sysctls, allow getcred. This allows identd to work in 3995 * jail. 3996 */ 3997 case PRIV_NETINET_GETCRED: 3998 return (0); 3999 4000 /* 4001 * Allow jailed root to set loginclass. 4002 */ 4003 case PRIV_PROC_SETLOGINCLASS: 4004 return (0); 4005 4006 default: 4007 /* 4008 * In all remaining cases, deny the privilege request. This 4009 * includes almost all network privileges, many system 4010 * configuration privileges. 4011 */ 4012 return (EPERM); 4013 } 4014 } 4015 4016 /* 4017 * Return the part of pr2's name that is relative to pr1, or the whole name 4018 * if it does not directly follow. 4019 */ 4020 4021 char * 4022 prison_name(struct prison *pr1, struct prison *pr2) 4023 { 4024 char *name; 4025 4026 /* Jails see themselves as "0" (if they see themselves at all). */ 4027 if (pr1 == pr2) 4028 return "0"; 4029 name = pr2->pr_name; 4030 if (prison_ischild(pr1, pr2)) { 4031 /* 4032 * pr1 isn't locked (and allprison_lock may not be either) 4033 * so its length can't be counted on. But the number of dots 4034 * can be counted on - and counted. 4035 */ 4036 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 4037 name = strchr(name, '.') + 1; 4038 } 4039 return (name); 4040 } 4041 4042 /* 4043 * Return the part of pr2's path that is relative to pr1, or the whole path 4044 * if it does not directly follow. 4045 */ 4046 static char * 4047 prison_path(struct prison *pr1, struct prison *pr2) 4048 { 4049 char *path1, *path2; 4050 int len1; 4051 4052 path1 = pr1->pr_path; 4053 path2 = pr2->pr_path; 4054 if (!strcmp(path1, "/")) 4055 return (path2); 4056 len1 = strlen(path1); 4057 if (strncmp(path1, path2, len1)) 4058 return (path2); 4059 if (path2[len1] == '\0') 4060 return "/"; 4061 if (path2[len1] == '/') 4062 return (path2 + len1); 4063 return (path2); 4064 } 4065 4066 4067 /* 4068 * Jail-related sysctls. 4069 */ 4070 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 4071 "Jails"); 4072 4073 static int 4074 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4075 { 4076 struct xprison *xp; 4077 struct prison *pr, *cpr; 4078 #ifdef INET 4079 struct in_addr *ip4 = NULL; 4080 int ip4s = 0; 4081 #endif 4082 #ifdef INET6 4083 struct in6_addr *ip6 = NULL; 4084 int ip6s = 0; 4085 #endif 4086 int descend, error; 4087 4088 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4089 pr = req->td->td_ucred->cr_prison; 4090 error = 0; 4091 sx_slock(&allprison_lock); 4092 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4093 #if defined(INET) || defined(INET6) 4094 again: 4095 #endif 4096 mtx_lock(&cpr->pr_mtx); 4097 #ifdef INET 4098 if (cpr->pr_ip4s > 0) { 4099 if (ip4s < cpr->pr_ip4s) { 4100 ip4s = cpr->pr_ip4s; 4101 mtx_unlock(&cpr->pr_mtx); 4102 ip4 = realloc(ip4, ip4s * 4103 sizeof(struct in_addr), M_TEMP, M_WAITOK); 4104 goto again; 4105 } 4106 bcopy(cpr->pr_ip4, ip4, 4107 cpr->pr_ip4s * sizeof(struct in_addr)); 4108 } 4109 #endif 4110 #ifdef INET6 4111 if (cpr->pr_ip6s > 0) { 4112 if (ip6s < cpr->pr_ip6s) { 4113 ip6s = cpr->pr_ip6s; 4114 mtx_unlock(&cpr->pr_mtx); 4115 ip6 = realloc(ip6, ip6s * 4116 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 4117 goto again; 4118 } 4119 bcopy(cpr->pr_ip6, ip6, 4120 cpr->pr_ip6s * sizeof(struct in6_addr)); 4121 } 4122 #endif 4123 if (cpr->pr_ref == 0) { 4124 mtx_unlock(&cpr->pr_mtx); 4125 continue; 4126 } 4127 bzero(xp, sizeof(*xp)); 4128 xp->pr_version = XPRISON_VERSION; 4129 xp->pr_id = cpr->pr_id; 4130 xp->pr_state = cpr->pr_uref > 0 4131 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4132 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4133 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4134 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4135 #ifdef INET 4136 xp->pr_ip4s = cpr->pr_ip4s; 4137 #endif 4138 #ifdef INET6 4139 xp->pr_ip6s = cpr->pr_ip6s; 4140 #endif 4141 mtx_unlock(&cpr->pr_mtx); 4142 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4143 if (error) 4144 break; 4145 #ifdef INET 4146 if (xp->pr_ip4s > 0) { 4147 error = SYSCTL_OUT(req, ip4, 4148 xp->pr_ip4s * sizeof(struct in_addr)); 4149 if (error) 4150 break; 4151 } 4152 #endif 4153 #ifdef INET6 4154 if (xp->pr_ip6s > 0) { 4155 error = SYSCTL_OUT(req, ip6, 4156 xp->pr_ip6s * sizeof(struct in6_addr)); 4157 if (error) 4158 break; 4159 } 4160 #endif 4161 } 4162 sx_sunlock(&allprison_lock); 4163 free(xp, M_TEMP); 4164 #ifdef INET 4165 free(ip4, M_TEMP); 4166 #endif 4167 #ifdef INET6 4168 free(ip6, M_TEMP); 4169 #endif 4170 return (error); 4171 } 4172 4173 SYSCTL_OID(_security_jail, OID_AUTO, list, 4174 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4175 sysctl_jail_list, "S", "List of active jails"); 4176 4177 static int 4178 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4179 { 4180 int error, injail; 4181 4182 injail = jailed(req->td->td_ucred); 4183 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4184 4185 return (error); 4186 } 4187 4188 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4189 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4190 sysctl_jail_jailed, "I", "Process in jail?"); 4191 4192 static int 4193 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4194 { 4195 int error, havevnet; 4196 #ifdef VIMAGE 4197 struct ucred *cred = req->td->td_ucred; 4198 4199 havevnet = jailed(cred) && prison_owns_vnet(cred); 4200 #else 4201 havevnet = 0; 4202 #endif 4203 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4204 4205 return (error); 4206 } 4207 4208 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4209 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4210 sysctl_jail_vnet, "I", "Jail owns VNET?"); 4211 4212 #if defined(INET) || defined(INET6) 4213 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4214 &jail_max_af_ips, 0, 4215 "Number of IP addresses a jail may have at most per address family"); 4216 #endif 4217 4218 /* 4219 * Default parameters for jail(2) compatability. For historical reasons, 4220 * the sysctl names have varying similarity to the parameter names. Prisons 4221 * just see their own parameters, and can't change them. 4222 */ 4223 static int 4224 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4225 { 4226 struct prison *pr; 4227 int allow, error, i; 4228 4229 pr = req->td->td_ucred->cr_prison; 4230 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4231 4232 /* Get the current flag value, and convert it to a boolean. */ 4233 i = (allow & arg2) ? 1 : 0; 4234 if (arg1 != NULL) 4235 i = !i; 4236 error = sysctl_handle_int(oidp, &i, 0, req); 4237 if (error || !req->newptr) 4238 return (error); 4239 i = i ? arg2 : 0; 4240 if (arg1 != NULL) 4241 i ^= arg2; 4242 /* 4243 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4244 * for writing. 4245 */ 4246 mtx_lock(&prison0.pr_mtx); 4247 jail_default_allow = (jail_default_allow & ~arg2) | i; 4248 mtx_unlock(&prison0.pr_mtx); 4249 return (0); 4250 } 4251 4252 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4253 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4254 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4255 "Processes in jail can set their hostnames"); 4256 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4257 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4258 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4259 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 4260 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4261 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4262 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4263 "Processes in jail can use System V IPC primitives"); 4264 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4265 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4266 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4267 "Prison root can create raw sockets"); 4268 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4269 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4270 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4271 "Processes in jail can alter system file flags"); 4272 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4273 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4274 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4275 "Processes in jail can mount/unmount jail-friendly file systems"); 4276 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 4277 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4278 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 4279 "Processes in jail can mount the devfs file system"); 4280 SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed, 4281 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4282 NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I", 4283 "Processes in jail can mount the fdescfs file system"); 4284 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 4285 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4286 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 4287 "Processes in jail can mount the nullfs file system"); 4288 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 4289 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4290 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 4291 "Processes in jail can mount the procfs file system"); 4292 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed, 4293 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4294 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I", 4295 "Processes in jail can mount the tmpfs file system"); 4296 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 4297 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4298 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 4299 "Processes in jail can mount the zfs file system"); 4300 4301 static int 4302 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4303 { 4304 struct prison *pr; 4305 int level, error; 4306 4307 pr = req->td->td_ucred->cr_prison; 4308 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4309 error = sysctl_handle_int(oidp, &level, 0, req); 4310 if (error || !req->newptr) 4311 return (error); 4312 *(int *)arg1 = level; 4313 return (0); 4314 } 4315 4316 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4317 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4318 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4319 sysctl_jail_default_level, "I", 4320 "Processes in jail cannot see all mounted file systems"); 4321 4322 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4323 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4324 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4325 sysctl_jail_default_level, "I", 4326 "Ruleset for the devfs filesystem in jail"); 4327 4328 /* 4329 * Nodes to describe jail parameters. Maximum length of string parameters 4330 * is returned in the string itself, and the other parameters exist merely 4331 * to make themselves and their types known. 4332 */ 4333 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4334 "Jail parameters"); 4335 4336 int 4337 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4338 { 4339 int i; 4340 long l; 4341 size_t s; 4342 char numbuf[12]; 4343 4344 switch (oidp->oid_kind & CTLTYPE) 4345 { 4346 case CTLTYPE_LONG: 4347 case CTLTYPE_ULONG: 4348 l = 0; 4349 #ifdef SCTL_MASK32 4350 if (!(req->flags & SCTL_MASK32)) 4351 #endif 4352 return (SYSCTL_OUT(req, &l, sizeof(l))); 4353 case CTLTYPE_INT: 4354 case CTLTYPE_UINT: 4355 i = 0; 4356 return (SYSCTL_OUT(req, &i, sizeof(i))); 4357 case CTLTYPE_STRING: 4358 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4359 return 4360 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4361 case CTLTYPE_STRUCT: 4362 s = (size_t)arg2; 4363 return (SYSCTL_OUT(req, &s, sizeof(s))); 4364 } 4365 return (0); 4366 } 4367 4368 /* 4369 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 4370 * jail creation time but cannot be changed in an existing jail. 4371 */ 4372 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4373 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4374 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4375 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4376 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4377 "I", "Jail secure level"); 4378 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 4379 "Jail value for kern.osreldate and uname -K"); 4380 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 4381 "Jail value for kern.osrelease and uname -r"); 4382 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4383 "I", "Jail cannot see all mounted file systems"); 4384 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4385 "I", "Ruleset for in-jail devfs mounts"); 4386 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4387 "B", "Jail persistence"); 4388 #ifdef VIMAGE 4389 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4390 "E,jailsys", "Virtual network stack"); 4391 #endif 4392 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4393 "B", "Jail is in the process of shutting down"); 4394 4395 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4396 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4397 "I", "Current number of child jails"); 4398 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4399 "I", "Maximum number of child jails"); 4400 4401 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4402 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4403 "Jail hostname"); 4404 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4405 "Jail NIS domainname"); 4406 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4407 "Jail host UUID"); 4408 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4409 "LU", "Jail host ID"); 4410 4411 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4412 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4413 4414 #ifdef INET 4415 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4416 "Jail IPv4 address virtualization"); 4417 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4418 "S,in_addr,a", "Jail IPv4 addresses"); 4419 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4420 "B", "Do (not) use IPv4 source address selection rather than the " 4421 "primary jail IPv4 address."); 4422 #endif 4423 #ifdef INET6 4424 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4425 "Jail IPv6 address virtualization"); 4426 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4427 "S,in6_addr,a", "Jail IPv6 addresses"); 4428 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4429 "B", "Do (not) use IPv6 source address selection rather than the " 4430 "primary jail IPv6 address."); 4431 #endif 4432 4433 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4434 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4435 "B", "Jail may set hostname"); 4436 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4437 "B", "Jail may use SYSV IPC"); 4438 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4439 "B", "Jail may create raw sockets"); 4440 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4441 "B", "Jail may alter system file flags"); 4442 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4443 "B", "Jail may set file quotas"); 4444 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4445 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4446 4447 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4448 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4449 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4450 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 4451 "B", "Jail may mount the devfs file system"); 4452 SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW, 4453 "B", "Jail may mount the fdescfs file system"); 4454 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 4455 "B", "Jail may mount the nullfs file system"); 4456 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 4457 "B", "Jail may mount the procfs file system"); 4458 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW, 4459 "B", "Jail may mount the tmpfs file system"); 4460 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 4461 "B", "Jail may mount the zfs file system"); 4462 4463 void 4464 prison_racct_foreach(void (*callback)(struct racct *racct, 4465 void *arg2, void *arg3), void *arg2, void *arg3) 4466 { 4467 struct prison_racct *prr; 4468 4469 sx_slock(&allprison_lock); 4470 LIST_FOREACH(prr, &allprison_racct, prr_next) 4471 (callback)(prr->prr_racct, arg2, arg3); 4472 sx_sunlock(&allprison_lock); 4473 } 4474 4475 static struct prison_racct * 4476 prison_racct_find_locked(const char *name) 4477 { 4478 struct prison_racct *prr; 4479 4480 sx_assert(&allprison_lock, SA_XLOCKED); 4481 4482 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4483 return (NULL); 4484 4485 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4486 if (strcmp(name, prr->prr_name) != 0) 4487 continue; 4488 4489 /* Found prison_racct with a matching name? */ 4490 prison_racct_hold(prr); 4491 return (prr); 4492 } 4493 4494 /* Add new prison_racct. */ 4495 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4496 racct_create(&prr->prr_racct); 4497 4498 strcpy(prr->prr_name, name); 4499 refcount_init(&prr->prr_refcount, 1); 4500 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4501 4502 return (prr); 4503 } 4504 4505 struct prison_racct * 4506 prison_racct_find(const char *name) 4507 { 4508 struct prison_racct *prr; 4509 4510 sx_xlock(&allprison_lock); 4511 prr = prison_racct_find_locked(name); 4512 sx_xunlock(&allprison_lock); 4513 return (prr); 4514 } 4515 4516 void 4517 prison_racct_hold(struct prison_racct *prr) 4518 { 4519 4520 refcount_acquire(&prr->prr_refcount); 4521 } 4522 4523 static void 4524 prison_racct_free_locked(struct prison_racct *prr) 4525 { 4526 4527 sx_assert(&allprison_lock, SA_XLOCKED); 4528 4529 if (refcount_release(&prr->prr_refcount)) { 4530 racct_destroy(&prr->prr_racct); 4531 LIST_REMOVE(prr, prr_next); 4532 free(prr, M_PRISON_RACCT); 4533 } 4534 } 4535 4536 void 4537 prison_racct_free(struct prison_racct *prr) 4538 { 4539 int old; 4540 4541 sx_assert(&allprison_lock, SA_UNLOCKED); 4542 4543 old = prr->prr_refcount; 4544 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4545 return; 4546 4547 sx_xlock(&allprison_lock); 4548 prison_racct_free_locked(prr); 4549 sx_xunlock(&allprison_lock); 4550 } 4551 4552 #ifdef RACCT 4553 static void 4554 prison_racct_attach(struct prison *pr) 4555 { 4556 struct prison_racct *prr; 4557 4558 sx_assert(&allprison_lock, SA_XLOCKED); 4559 4560 prr = prison_racct_find_locked(pr->pr_name); 4561 KASSERT(prr != NULL, ("cannot find prison_racct")); 4562 4563 pr->pr_prison_racct = prr; 4564 } 4565 4566 /* 4567 * Handle jail renaming. From the racct point of view, renaming means 4568 * moving from one prison_racct to another. 4569 */ 4570 static void 4571 prison_racct_modify(struct prison *pr) 4572 { 4573 struct proc *p; 4574 struct ucred *cred; 4575 struct prison_racct *oldprr; 4576 4577 sx_slock(&allproc_lock); 4578 sx_xlock(&allprison_lock); 4579 4580 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4581 sx_xunlock(&allprison_lock); 4582 sx_sunlock(&allproc_lock); 4583 return; 4584 } 4585 4586 oldprr = pr->pr_prison_racct; 4587 pr->pr_prison_racct = NULL; 4588 4589 prison_racct_attach(pr); 4590 4591 /* 4592 * Move resource utilisation records. 4593 */ 4594 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4595 4596 /* 4597 * Force rctl to reattach rules to processes. 4598 */ 4599 FOREACH_PROC_IN_SYSTEM(p) { 4600 PROC_LOCK(p); 4601 cred = crhold(p->p_ucred); 4602 PROC_UNLOCK(p); 4603 racct_proc_ucred_changed(p, cred, cred); 4604 crfree(cred); 4605 } 4606 4607 sx_sunlock(&allproc_lock); 4608 prison_racct_free_locked(oldprr); 4609 sx_xunlock(&allprison_lock); 4610 } 4611 4612 static void 4613 prison_racct_detach(struct prison *pr) 4614 { 4615 4616 sx_assert(&allprison_lock, SA_UNLOCKED); 4617 4618 if (pr->pr_prison_racct == NULL) 4619 return; 4620 prison_racct_free(pr->pr_prison_racct); 4621 pr->pr_prison_racct = NULL; 4622 } 4623 #endif /* RACCT */ 4624 4625 #ifdef DDB 4626 4627 static void 4628 db_show_prison(struct prison *pr) 4629 { 4630 int fi; 4631 #if defined(INET) || defined(INET6) 4632 int ii; 4633 #endif 4634 unsigned jsf; 4635 #ifdef INET6 4636 char ip6buf[INET6_ADDRSTRLEN]; 4637 #endif 4638 4639 db_printf("prison %p:\n", pr); 4640 db_printf(" jid = %d\n", pr->pr_id); 4641 db_printf(" name = %s\n", pr->pr_name); 4642 db_printf(" parent = %p\n", pr->pr_parent); 4643 db_printf(" ref = %d\n", pr->pr_ref); 4644 db_printf(" uref = %d\n", pr->pr_uref); 4645 db_printf(" path = %s\n", pr->pr_path); 4646 db_printf(" cpuset = %d\n", pr->pr_cpuset 4647 ? pr->pr_cpuset->cs_id : -1); 4648 #ifdef VIMAGE 4649 db_printf(" vnet = %p\n", pr->pr_vnet); 4650 #endif 4651 db_printf(" root = %p\n", pr->pr_root); 4652 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4653 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4654 db_printf(" children.max = %d\n", pr->pr_childmax); 4655 db_printf(" children.cur = %d\n", pr->pr_childcount); 4656 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4657 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4658 db_printf(" flags = 0x%x", pr->pr_flags); 4659 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4660 fi++) 4661 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4662 db_printf(" %s", pr_flag_names[fi]); 4663 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4664 fi++) { 4665 jsf = pr->pr_flags & 4666 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4667 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4668 pr_flag_jailsys[fi].disable && 4669 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4670 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4671 : "inherit"); 4672 } 4673 db_printf(" allow = 0x%x", pr->pr_allow); 4674 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4675 fi++) 4676 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4677 db_printf(" %s", pr_allow_names[fi]); 4678 db_printf("\n"); 4679 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4680 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4681 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4682 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4683 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4684 #ifdef INET 4685 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4686 for (ii = 0; ii < pr->pr_ip4s; ii++) 4687 db_printf(" %s %s\n", 4688 ii == 0 ? "ip4.addr =" : " ", 4689 inet_ntoa(pr->pr_ip4[ii])); 4690 #endif 4691 #ifdef INET6 4692 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4693 for (ii = 0; ii < pr->pr_ip6s; ii++) 4694 db_printf(" %s %s\n", 4695 ii == 0 ? "ip6.addr =" : " ", 4696 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4697 #endif 4698 } 4699 4700 DB_SHOW_COMMAND(prison, db_show_prison_command) 4701 { 4702 struct prison *pr; 4703 4704 if (!have_addr) { 4705 /* 4706 * Show all prisons in the list, and prison0 which is not 4707 * listed. 4708 */ 4709 db_show_prison(&prison0); 4710 if (!db_pager_quit) { 4711 TAILQ_FOREACH(pr, &allprison, pr_list) { 4712 db_show_prison(pr); 4713 if (db_pager_quit) 4714 break; 4715 } 4716 } 4717 return; 4718 } 4719 4720 if (addr == 0) 4721 pr = &prison0; 4722 else { 4723 /* Look for a prison with the ID and with references. */ 4724 TAILQ_FOREACH(pr, &allprison, pr_list) 4725 if (pr->pr_id == addr && pr->pr_ref > 0) 4726 break; 4727 if (pr == NULL) 4728 /* Look again, without requiring a reference. */ 4729 TAILQ_FOREACH(pr, &allprison, pr_list) 4730 if (pr->pr_id == addr) 4731 break; 4732 if (pr == NULL) 4733 /* Assume address points to a valid prison. */ 4734 pr = (struct prison *)addr; 4735 } 4736 db_show_prison(pr); 4737 } 4738 4739 #endif /* DDB */ 4740