1 /*- 2 * Copyright (c) 1999 Poul-Henning Kamp. 3 * Copyright (c) 2008 Bjoern A. Zeeb. 4 * Copyright (c) 2009 James Gritton. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_compat.h" 33 #include "opt_ddb.h" 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/kernel.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/sysproto.h> 43 #include <sys/malloc.h> 44 #include <sys/osd.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/taskqueue.h> 48 #include <sys/fcntl.h> 49 #include <sys/jail.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/racct.h> 53 #include <sys/refcount.h> 54 #include <sys/sx.h> 55 #include <sys/sysent.h> 56 #include <sys/namei.h> 57 #include <sys/mount.h> 58 #include <sys/queue.h> 59 #include <sys/socket.h> 60 #include <sys/syscallsubr.h> 61 #include <sys/sysctl.h> 62 #include <sys/vnode.h> 63 64 #include <net/if.h> 65 #include <net/vnet.h> 66 67 #include <netinet/in.h> 68 69 #ifdef DDB 70 #include <ddb/ddb.h> 71 #endif /* DDB */ 72 73 #include <security/mac/mac_framework.h> 74 75 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 76 77 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 78 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 79 80 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 81 #ifdef INET 82 #ifdef INET6 83 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 84 #else 85 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 86 #endif 87 #else /* !INET */ 88 #ifdef INET6 89 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 90 #else 91 #define _PR_IP_SADDRSEL 0 92 #endif 93 #endif 94 95 /* prison0 describes what is "real" about the system. */ 96 struct prison prison0 = { 97 .pr_id = 0, 98 .pr_name = "0", 99 .pr_ref = 1, 100 .pr_uref = 1, 101 .pr_path = "/", 102 .pr_securelevel = -1, 103 .pr_devfs_rsnum = 0, 104 .pr_childmax = JAIL_MAX, 105 .pr_hostuuid = DEFAULT_HOSTUUID, 106 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 107 #ifdef VIMAGE 108 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 109 #else 110 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 111 #endif 112 .pr_allow = PR_ALLOW_ALL, 113 }; 114 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 115 116 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 117 struct sx allprison_lock; 118 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 119 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 120 LIST_HEAD(, prison_racct) allprison_racct; 121 int lastprid = 0; 122 123 static int do_jail_attach(struct thread *td, struct prison *pr); 124 static void prison_complete(void *context, int pending); 125 static void prison_deref(struct prison *pr, int flags); 126 static char *prison_path(struct prison *pr1, struct prison *pr2); 127 static void prison_remove_one(struct prison *pr); 128 #ifdef RACCT 129 static void prison_racct_attach(struct prison *pr); 130 static void prison_racct_modify(struct prison *pr); 131 static void prison_racct_detach(struct prison *pr); 132 #endif 133 #ifdef INET 134 static int _prison_check_ip4(const struct prison *, const struct in_addr *); 135 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4); 136 #endif 137 #ifdef INET6 138 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6); 139 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6); 140 #endif 141 142 /* Flags for prison_deref */ 143 #define PD_DEREF 0x01 144 #define PD_DEUREF 0x02 145 #define PD_LOCKED 0x04 146 #define PD_LIST_SLOCKED 0x08 147 #define PD_LIST_XLOCKED 0x10 148 149 /* 150 * Parameter names corresponding to PR_* flag values. Size values are for kvm 151 * as we cannot figure out the size of a sparse array, or an array without a 152 * terminating entry. 153 */ 154 static char *pr_flag_names[] = { 155 [0] = "persist", 156 #ifdef INET 157 [7] = "ip4.saddrsel", 158 #endif 159 #ifdef INET6 160 [8] = "ip6.saddrsel", 161 #endif 162 }; 163 const size_t pr_flag_names_size = sizeof(pr_flag_names); 164 165 static char *pr_flag_nonames[] = { 166 [0] = "nopersist", 167 #ifdef INET 168 [7] = "ip4.nosaddrsel", 169 #endif 170 #ifdef INET6 171 [8] = "ip6.nosaddrsel", 172 #endif 173 }; 174 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames); 175 176 struct jailsys_flags { 177 const char *name; 178 unsigned disable; 179 unsigned new; 180 } pr_flag_jailsys[] = { 181 { "host", 0, PR_HOST }, 182 #ifdef VIMAGE 183 { "vnet", 0, PR_VNET }, 184 #endif 185 #ifdef INET 186 { "ip4", PR_IP4_USER, PR_IP4_USER }, 187 #endif 188 #ifdef INET6 189 { "ip6", PR_IP6_USER, PR_IP6_USER }, 190 #endif 191 }; 192 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 193 194 static char *pr_allow_names[] = { 195 "allow.set_hostname", 196 "allow.sysvipc", 197 "allow.raw_sockets", 198 "allow.chflags", 199 "allow.mount", 200 "allow.quotas", 201 "allow.socket_af", 202 "allow.mount.devfs", 203 "allow.mount.nullfs", 204 "allow.mount.zfs", 205 "allow.mount.procfs", 206 "allow.mount.tmpfs", 207 "allow.mount.fdescfs", 208 "allow.mount.linprocfs", 209 "allow.mount.linsysfs", 210 }; 211 const size_t pr_allow_names_size = sizeof(pr_allow_names); 212 213 static char *pr_allow_nonames[] = { 214 "allow.noset_hostname", 215 "allow.nosysvipc", 216 "allow.noraw_sockets", 217 "allow.nochflags", 218 "allow.nomount", 219 "allow.noquotas", 220 "allow.nosocket_af", 221 "allow.mount.nodevfs", 222 "allow.mount.nonullfs", 223 "allow.mount.nozfs", 224 "allow.mount.noprocfs", 225 "allow.mount.notmpfs", 226 "allow.mount.nofdescfs", 227 "allow.mount.nolinprocfs", 228 "allow.mount.nolinsysfs", 229 }; 230 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames); 231 232 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 233 #define JAIL_DEFAULT_ENFORCE_STATFS 2 234 #define JAIL_DEFAULT_DEVFS_RSNUM 0 235 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 236 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 237 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 238 #if defined(INET) || defined(INET6) 239 static unsigned jail_max_af_ips = 255; 240 #endif 241 242 /* 243 * Initialize the parts of prison0 that can't be static-initialized with 244 * constants. This is called from proc0_init() after creating thread0 cpuset. 245 */ 246 void 247 prison0_init(void) 248 { 249 250 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 251 prison0.pr_osreldate = osreldate; 252 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 253 } 254 255 #ifdef INET 256 static int 257 qcmp_v4(const void *ip1, const void *ip2) 258 { 259 in_addr_t iaa, iab; 260 261 /* 262 * We need to compare in HBO here to get the list sorted as expected 263 * by the result of the code. Sorting NBO addresses gives you 264 * interesting results. If you do not understand, do not try. 265 */ 266 iaa = ntohl(((const struct in_addr *)ip1)->s_addr); 267 iab = ntohl(((const struct in_addr *)ip2)->s_addr); 268 269 /* 270 * Do not simply return the difference of the two numbers, the int is 271 * not wide enough. 272 */ 273 if (iaa > iab) 274 return (1); 275 else if (iaa < iab) 276 return (-1); 277 else 278 return (0); 279 } 280 #endif 281 282 #ifdef INET6 283 static int 284 qcmp_v6(const void *ip1, const void *ip2) 285 { 286 const struct in6_addr *ia6a, *ia6b; 287 int i, rc; 288 289 ia6a = (const struct in6_addr *)ip1; 290 ia6b = (const struct in6_addr *)ip2; 291 292 rc = 0; 293 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 294 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 295 rc = 1; 296 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 297 rc = -1; 298 } 299 return (rc); 300 } 301 #endif 302 303 /* 304 * struct jail_args { 305 * struct jail *jail; 306 * }; 307 */ 308 int 309 sys_jail(struct thread *td, struct jail_args *uap) 310 { 311 uint32_t version; 312 int error; 313 struct jail j; 314 315 error = copyin(uap->jail, &version, sizeof(uint32_t)); 316 if (error) 317 return (error); 318 319 switch (version) { 320 case 0: 321 { 322 struct jail_v0 j0; 323 324 /* FreeBSD single IPv4 jails. */ 325 bzero(&j, sizeof(struct jail)); 326 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 327 if (error) 328 return (error); 329 j.version = j0.version; 330 j.path = j0.path; 331 j.hostname = j0.hostname; 332 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 333 break; 334 } 335 336 case 1: 337 /* 338 * Version 1 was used by multi-IPv4 jail implementations 339 * that never made it into the official kernel. 340 */ 341 return (EINVAL); 342 343 case 2: /* JAIL_API_VERSION */ 344 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 345 error = copyin(uap->jail, &j, sizeof(struct jail)); 346 if (error) 347 return (error); 348 break; 349 350 default: 351 /* Sci-Fi jails are not supported, sorry. */ 352 return (EINVAL); 353 } 354 return (kern_jail(td, &j)); 355 } 356 357 int 358 kern_jail(struct thread *td, struct jail *j) 359 { 360 struct iovec optiov[2 * (4 361 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0]) 362 #ifdef INET 363 + 1 364 #endif 365 #ifdef INET6 366 + 1 367 #endif 368 )]; 369 struct uio opt; 370 char *u_path, *u_hostname, *u_name; 371 #ifdef INET 372 uint32_t ip4s; 373 struct in_addr *u_ip4; 374 #endif 375 #ifdef INET6 376 struct in6_addr *u_ip6; 377 #endif 378 size_t tmplen; 379 int error, enforce_statfs, fi; 380 381 bzero(&optiov, sizeof(optiov)); 382 opt.uio_iov = optiov; 383 opt.uio_iovcnt = 0; 384 opt.uio_offset = -1; 385 opt.uio_resid = -1; 386 opt.uio_segflg = UIO_SYSSPACE; 387 opt.uio_rw = UIO_READ; 388 opt.uio_td = td; 389 390 /* Set permissions for top-level jails from sysctls. */ 391 if (!jailed(td->td_ucred)) { 392 for (fi = 0; fi < sizeof(pr_allow_names) / 393 sizeof(pr_allow_names[0]); fi++) { 394 optiov[opt.uio_iovcnt].iov_base = 395 (jail_default_allow & (1 << fi)) 396 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 397 optiov[opt.uio_iovcnt].iov_len = 398 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 399 opt.uio_iovcnt += 2; 400 } 401 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 402 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 403 opt.uio_iovcnt++; 404 enforce_statfs = jail_default_enforce_statfs; 405 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 406 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 407 opt.uio_iovcnt++; 408 } 409 410 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 411 #ifdef INET 412 ip4s = (j->version == 0) ? 1 : j->ip4s; 413 if (ip4s > jail_max_af_ips) 414 return (EINVAL); 415 tmplen += ip4s * sizeof(struct in_addr); 416 #else 417 if (j->ip4s > 0) 418 return (EINVAL); 419 #endif 420 #ifdef INET6 421 if (j->ip6s > jail_max_af_ips) 422 return (EINVAL); 423 tmplen += j->ip6s * sizeof(struct in6_addr); 424 #else 425 if (j->ip6s > 0) 426 return (EINVAL); 427 #endif 428 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 429 u_hostname = u_path + MAXPATHLEN; 430 u_name = u_hostname + MAXHOSTNAMELEN; 431 #ifdef INET 432 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 433 #endif 434 #ifdef INET6 435 #ifdef INET 436 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 437 #else 438 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 439 #endif 440 #endif 441 optiov[opt.uio_iovcnt].iov_base = "path"; 442 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 443 opt.uio_iovcnt++; 444 optiov[opt.uio_iovcnt].iov_base = u_path; 445 error = copyinstr(j->path, u_path, MAXPATHLEN, 446 &optiov[opt.uio_iovcnt].iov_len); 447 if (error) { 448 free(u_path, M_TEMP); 449 return (error); 450 } 451 opt.uio_iovcnt++; 452 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 453 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 454 opt.uio_iovcnt++; 455 optiov[opt.uio_iovcnt].iov_base = u_hostname; 456 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 457 &optiov[opt.uio_iovcnt].iov_len); 458 if (error) { 459 free(u_path, M_TEMP); 460 return (error); 461 } 462 opt.uio_iovcnt++; 463 if (j->jailname != NULL) { 464 optiov[opt.uio_iovcnt].iov_base = "name"; 465 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 466 opt.uio_iovcnt++; 467 optiov[opt.uio_iovcnt].iov_base = u_name; 468 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 469 &optiov[opt.uio_iovcnt].iov_len); 470 if (error) { 471 free(u_path, M_TEMP); 472 return (error); 473 } 474 opt.uio_iovcnt++; 475 } 476 #ifdef INET 477 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 478 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 479 opt.uio_iovcnt++; 480 optiov[opt.uio_iovcnt].iov_base = u_ip4; 481 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 482 if (j->version == 0) 483 u_ip4->s_addr = j->ip4s; 484 else { 485 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 486 if (error) { 487 free(u_path, M_TEMP); 488 return (error); 489 } 490 } 491 opt.uio_iovcnt++; 492 #endif 493 #ifdef INET6 494 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 495 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 496 opt.uio_iovcnt++; 497 optiov[opt.uio_iovcnt].iov_base = u_ip6; 498 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 499 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 500 if (error) { 501 free(u_path, M_TEMP); 502 return (error); 503 } 504 opt.uio_iovcnt++; 505 #endif 506 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]), 507 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 508 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 509 free(u_path, M_TEMP); 510 return (error); 511 } 512 513 514 /* 515 * struct jail_set_args { 516 * struct iovec *iovp; 517 * unsigned int iovcnt; 518 * int flags; 519 * }; 520 */ 521 int 522 sys_jail_set(struct thread *td, struct jail_set_args *uap) 523 { 524 struct uio *auio; 525 int error; 526 527 /* Check that we have an even number of iovecs. */ 528 if (uap->iovcnt & 1) 529 return (EINVAL); 530 531 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 532 if (error) 533 return (error); 534 error = kern_jail_set(td, auio, uap->flags); 535 free(auio, M_IOV); 536 return (error); 537 } 538 539 int 540 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 541 { 542 struct nameidata nd; 543 #ifdef INET 544 struct in_addr *ip4; 545 #endif 546 #ifdef INET6 547 struct in6_addr *ip6; 548 #endif 549 struct vfsopt *opt; 550 struct vfsoptlist *opts; 551 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 552 struct vnode *root; 553 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 554 char *g_path, *osrelstr; 555 #if defined(INET) || defined(INET6) 556 struct prison *tppr; 557 void *op; 558 #endif 559 unsigned long hid; 560 size_t namelen, onamelen; 561 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos; 562 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 563 int fi, jid, jsys, len, level; 564 int childmax, osreldt, rsnum, slevel; 565 int fullpath_disabled; 566 #if defined(INET) || defined(INET6) 567 int ii, ij; 568 #endif 569 #ifdef INET 570 int ip4s, redo_ip4; 571 #endif 572 #ifdef INET6 573 int ip6s, redo_ip6; 574 #endif 575 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 576 unsigned tallow; 577 char numbuf[12]; 578 579 error = priv_check(td, PRIV_JAIL_SET); 580 if (!error && (flags & JAIL_ATTACH)) 581 error = priv_check(td, PRIV_JAIL_ATTACH); 582 if (error) 583 return (error); 584 mypr = ppr = td->td_ucred->cr_prison; 585 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 586 return (EPERM); 587 if (flags & ~JAIL_SET_MASK) 588 return (EINVAL); 589 590 /* 591 * Check all the parameters before committing to anything. Not all 592 * errors can be caught early, but we may as well try. Also, this 593 * takes care of some expensive stuff (path lookup) before getting 594 * the allprison lock. 595 * 596 * XXX Jails are not filesystems, and jail parameters are not mount 597 * options. But it makes more sense to re-use the vfsopt code 598 * than duplicate it under a different name. 599 */ 600 error = vfs_buildopts(optuio, &opts); 601 if (error) 602 return (error); 603 #ifdef INET 604 ip4 = NULL; 605 #endif 606 #ifdef INET6 607 ip6 = NULL; 608 #endif 609 g_path = NULL; 610 611 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 612 if (error == ENOENT) 613 jid = 0; 614 else if (error != 0) 615 goto done_free; 616 617 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 618 if (error == ENOENT) 619 gotslevel = 0; 620 else if (error != 0) 621 goto done_free; 622 else 623 gotslevel = 1; 624 625 error = 626 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 627 if (error == ENOENT) 628 gotchildmax = 0; 629 else if (error != 0) 630 goto done_free; 631 else 632 gotchildmax = 1; 633 634 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 635 if (error == ENOENT) 636 gotenforce = 0; 637 else if (error != 0) 638 goto done_free; 639 else if (enforce < 0 || enforce > 2) { 640 error = EINVAL; 641 goto done_free; 642 } else 643 gotenforce = 1; 644 645 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 646 if (error == ENOENT) 647 gotrsnum = 0; 648 else if (error != 0) 649 goto done_free; 650 else 651 gotrsnum = 1; 652 653 pr_flags = ch_flags = 0; 654 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 655 fi++) { 656 if (pr_flag_names[fi] == NULL) 657 continue; 658 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 659 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 660 } 661 ch_flags |= pr_flags; 662 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 663 fi++) { 664 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 665 sizeof(jsys)); 666 if (error == ENOENT) 667 continue; 668 if (error != 0) 669 goto done_free; 670 switch (jsys) { 671 case JAIL_SYS_DISABLE: 672 if (!pr_flag_jailsys[fi].disable) { 673 error = EINVAL; 674 goto done_free; 675 } 676 pr_flags |= pr_flag_jailsys[fi].disable; 677 break; 678 case JAIL_SYS_NEW: 679 pr_flags |= pr_flag_jailsys[fi].new; 680 break; 681 case JAIL_SYS_INHERIT: 682 break; 683 default: 684 error = EINVAL; 685 goto done_free; 686 } 687 ch_flags |= 688 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 689 } 690 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 691 && !(pr_flags & PR_PERSIST)) { 692 error = EINVAL; 693 vfs_opterror(opts, "new jail must persist or attach"); 694 goto done_errmsg; 695 } 696 #ifdef VIMAGE 697 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 698 error = EINVAL; 699 vfs_opterror(opts, "vnet cannot be changed after creation"); 700 goto done_errmsg; 701 } 702 #endif 703 #ifdef INET 704 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 705 error = EINVAL; 706 vfs_opterror(opts, "ip4 cannot be changed after creation"); 707 goto done_errmsg; 708 } 709 #endif 710 #ifdef INET6 711 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 712 error = EINVAL; 713 vfs_opterror(opts, "ip6 cannot be changed after creation"); 714 goto done_errmsg; 715 } 716 #endif 717 718 pr_allow = ch_allow = 0; 719 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 720 fi++) { 721 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 722 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 723 } 724 ch_allow |= pr_allow; 725 726 error = vfs_getopt(opts, "name", (void **)&name, &len); 727 if (error == ENOENT) 728 name = NULL; 729 else if (error != 0) 730 goto done_free; 731 else { 732 if (len == 0 || name[len - 1] != '\0') { 733 error = EINVAL; 734 goto done_free; 735 } 736 if (len > MAXHOSTNAMELEN) { 737 error = ENAMETOOLONG; 738 goto done_free; 739 } 740 } 741 742 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 743 if (error == ENOENT) 744 host = NULL; 745 else if (error != 0) 746 goto done_free; 747 else { 748 ch_flags |= PR_HOST; 749 pr_flags |= PR_HOST; 750 if (len == 0 || host[len - 1] != '\0') { 751 error = EINVAL; 752 goto done_free; 753 } 754 if (len > MAXHOSTNAMELEN) { 755 error = ENAMETOOLONG; 756 goto done_free; 757 } 758 } 759 760 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 761 if (error == ENOENT) 762 domain = NULL; 763 else if (error != 0) 764 goto done_free; 765 else { 766 ch_flags |= PR_HOST; 767 pr_flags |= PR_HOST; 768 if (len == 0 || domain[len - 1] != '\0') { 769 error = EINVAL; 770 goto done_free; 771 } 772 if (len > MAXHOSTNAMELEN) { 773 error = ENAMETOOLONG; 774 goto done_free; 775 } 776 } 777 778 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 779 if (error == ENOENT) 780 uuid = NULL; 781 else if (error != 0) 782 goto done_free; 783 else { 784 ch_flags |= PR_HOST; 785 pr_flags |= PR_HOST; 786 if (len == 0 || uuid[len - 1] != '\0') { 787 error = EINVAL; 788 goto done_free; 789 } 790 if (len > HOSTUUIDLEN) { 791 error = ENAMETOOLONG; 792 goto done_free; 793 } 794 } 795 796 #ifdef COMPAT_FREEBSD32 797 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 798 uint32_t hid32; 799 800 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 801 hid = hid32; 802 } else 803 #endif 804 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 805 if (error == ENOENT) 806 gothid = 0; 807 else if (error != 0) 808 goto done_free; 809 else { 810 gothid = 1; 811 ch_flags |= PR_HOST; 812 pr_flags |= PR_HOST; 813 } 814 815 #ifdef INET 816 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 817 if (error == ENOENT) 818 ip4s = 0; 819 else if (error != 0) 820 goto done_free; 821 else if (ip4s & (sizeof(*ip4) - 1)) { 822 error = EINVAL; 823 goto done_free; 824 } else { 825 ch_flags |= PR_IP4_USER; 826 pr_flags |= PR_IP4_USER; 827 if (ip4s > 0) { 828 ip4s /= sizeof(*ip4); 829 if (ip4s > jail_max_af_ips) { 830 error = EINVAL; 831 vfs_opterror(opts, "too many IPv4 addresses"); 832 goto done_errmsg; 833 } 834 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 835 bcopy(op, ip4, ip4s * sizeof(*ip4)); 836 /* 837 * IP addresses are all sorted but ip[0] to preserve 838 * the primary IP address as given from userland. 839 * This special IP is used for unbound outgoing 840 * connections as well for "loopback" traffic in case 841 * source address selection cannot find any more fitting 842 * address to connect from. 843 */ 844 if (ip4s > 1) 845 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4); 846 /* 847 * Check for duplicate addresses and do some simple 848 * zero and broadcast checks. If users give other bogus 849 * addresses it is their problem. 850 * 851 * We do not have to care about byte order for these 852 * checks so we will do them in NBO. 853 */ 854 for (ii = 0; ii < ip4s; ii++) { 855 if (ip4[ii].s_addr == INADDR_ANY || 856 ip4[ii].s_addr == INADDR_BROADCAST) { 857 error = EINVAL; 858 goto done_free; 859 } 860 if ((ii+1) < ip4s && 861 (ip4[0].s_addr == ip4[ii+1].s_addr || 862 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 863 error = EINVAL; 864 goto done_free; 865 } 866 } 867 } 868 } 869 #endif 870 871 #ifdef INET6 872 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 873 if (error == ENOENT) 874 ip6s = 0; 875 else if (error != 0) 876 goto done_free; 877 else if (ip6s & (sizeof(*ip6) - 1)) { 878 error = EINVAL; 879 goto done_free; 880 } else { 881 ch_flags |= PR_IP6_USER; 882 pr_flags |= PR_IP6_USER; 883 if (ip6s > 0) { 884 ip6s /= sizeof(*ip6); 885 if (ip6s > jail_max_af_ips) { 886 error = EINVAL; 887 vfs_opterror(opts, "too many IPv6 addresses"); 888 goto done_errmsg; 889 } 890 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 891 bcopy(op, ip6, ip6s * sizeof(*ip6)); 892 if (ip6s > 1) 893 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6); 894 for (ii = 0; ii < ip6s; ii++) { 895 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 896 error = EINVAL; 897 goto done_free; 898 } 899 if ((ii+1) < ip6s && 900 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 901 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 902 { 903 error = EINVAL; 904 goto done_free; 905 } 906 } 907 } 908 } 909 #endif 910 911 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 912 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 913 error = EINVAL; 914 vfs_opterror(opts, 915 "vnet jails cannot have IP address restrictions"); 916 goto done_errmsg; 917 } 918 #endif 919 920 fullpath_disabled = 0; 921 root = NULL; 922 error = vfs_getopt(opts, "path", (void **)&path, &len); 923 if (error == ENOENT) 924 path = NULL; 925 else if (error != 0) 926 goto done_free; 927 else { 928 if (flags & JAIL_UPDATE) { 929 error = EINVAL; 930 vfs_opterror(opts, 931 "path cannot be changed after creation"); 932 goto done_errmsg; 933 } 934 if (len == 0 || path[len - 1] != '\0') { 935 error = EINVAL; 936 goto done_free; 937 } 938 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 939 path, td); 940 error = namei(&nd); 941 if (error) 942 goto done_free; 943 root = nd.ni_vp; 944 NDFREE(&nd, NDF_ONLY_PNBUF); 945 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 946 strlcpy(g_path, path, MAXPATHLEN); 947 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 948 if (error == 0) 949 path = g_path; 950 else if (error == ENODEV) { 951 /* proceed if sysctl debug.disablefullpath == 1 */ 952 fullpath_disabled = 1; 953 if (len < 2 || (len == 2 && path[0] == '/')) 954 path = NULL; 955 } else { 956 /* exit on other errors */ 957 goto done_free; 958 } 959 if (root->v_type != VDIR) { 960 error = ENOTDIR; 961 vput(root); 962 goto done_free; 963 } 964 VOP_UNLOCK(root, 0); 965 if (fullpath_disabled) { 966 /* Leave room for a real-root full pathname. */ 967 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 968 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 969 error = ENAMETOOLONG; 970 goto done_free; 971 } 972 } 973 } 974 975 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 976 if (error == ENOENT) 977 osrelstr = NULL; 978 else if (error != 0) 979 goto done_free; 980 else { 981 if (flags & JAIL_UPDATE) { 982 error = EINVAL; 983 vfs_opterror(opts, 984 "osrelease cannot be changed after creation"); 985 goto done_errmsg; 986 } 987 if (len == 0 || len >= OSRELEASELEN) { 988 error = EINVAL; 989 vfs_opterror(opts, 990 "osrelease string must be 1-%d bytes long", 991 OSRELEASELEN - 1); 992 goto done_errmsg; 993 } 994 } 995 996 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 997 if (error == ENOENT) 998 osreldt = 0; 999 else if (error != 0) 1000 goto done_free; 1001 else { 1002 if (flags & JAIL_UPDATE) { 1003 error = EINVAL; 1004 vfs_opterror(opts, 1005 "osreldate cannot be changed after creation"); 1006 goto done_errmsg; 1007 } 1008 if (osreldt == 0) { 1009 error = EINVAL; 1010 vfs_opterror(opts, "osreldate cannot be 0"); 1011 goto done_errmsg; 1012 } 1013 } 1014 1015 /* 1016 * Grab the allprison lock before letting modules check their 1017 * parameters. Once we have it, do not let go so we'll have a 1018 * consistent view of the OSD list. 1019 */ 1020 sx_xlock(&allprison_lock); 1021 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts); 1022 if (error) 1023 goto done_unlock_list; 1024 1025 /* By now, all parameters should have been noted. */ 1026 TAILQ_FOREACH(opt, opts, link) { 1027 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1028 error = EINVAL; 1029 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1030 goto done_unlock_list; 1031 } 1032 } 1033 1034 /* 1035 * See if we are creating a new record or updating an existing one. 1036 * This abuses the file error codes ENOENT and EEXIST. 1037 */ 1038 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 1039 if (!cuflags) { 1040 error = EINVAL; 1041 vfs_opterror(opts, "no valid operation (create or update)"); 1042 goto done_unlock_list; 1043 } 1044 pr = NULL; 1045 namelc = NULL; 1046 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 1047 namelc = strrchr(name, '.'); 1048 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 1049 if (*p != '\0') 1050 jid = 0; 1051 } 1052 if (jid != 0) { 1053 /* 1054 * See if a requested jid already exists. There is an 1055 * information leak here if the jid exists but is not within 1056 * the caller's jail hierarchy. Jail creators will get EEXIST 1057 * even though they cannot see the jail, and CREATE | UPDATE 1058 * will return ENOENT which is not normally a valid error. 1059 */ 1060 if (jid < 0) { 1061 error = EINVAL; 1062 vfs_opterror(opts, "negative jid"); 1063 goto done_unlock_list; 1064 } 1065 pr = prison_find(jid); 1066 if (pr != NULL) { 1067 ppr = pr->pr_parent; 1068 /* Create: jid must not exist. */ 1069 if (cuflags == JAIL_CREATE) { 1070 mtx_unlock(&pr->pr_mtx); 1071 error = EEXIST; 1072 vfs_opterror(opts, "jail %d already exists", 1073 jid); 1074 goto done_unlock_list; 1075 } 1076 if (!prison_ischild(mypr, pr)) { 1077 mtx_unlock(&pr->pr_mtx); 1078 pr = NULL; 1079 } else if (pr->pr_uref == 0) { 1080 if (!(flags & JAIL_DYING)) { 1081 mtx_unlock(&pr->pr_mtx); 1082 error = ENOENT; 1083 vfs_opterror(opts, "jail %d is dying", 1084 jid); 1085 goto done_unlock_list; 1086 } else if ((flags & JAIL_ATTACH) || 1087 (pr_flags & PR_PERSIST)) { 1088 /* 1089 * A dying jail might be resurrected 1090 * (via attach or persist), but first 1091 * it must determine if another jail 1092 * has claimed its name. Accomplish 1093 * this by implicitly re-setting the 1094 * name. 1095 */ 1096 if (name == NULL) 1097 name = prison_name(mypr, pr); 1098 } 1099 } 1100 } 1101 if (pr == NULL) { 1102 /* Update: jid must exist. */ 1103 if (cuflags == JAIL_UPDATE) { 1104 error = ENOENT; 1105 vfs_opterror(opts, "jail %d not found", jid); 1106 goto done_unlock_list; 1107 } 1108 } 1109 } 1110 /* 1111 * If the caller provided a name, look for a jail by that name. 1112 * This has different semantics for creates and updates keyed by jid 1113 * (where the name must not already exist in a different jail), 1114 * and updates keyed by the name itself (where the name must exist 1115 * because that is the jail being updated). 1116 */ 1117 if (name != NULL) { 1118 namelc = strrchr(name, '.'); 1119 if (namelc == NULL) 1120 namelc = name; 1121 else { 1122 /* 1123 * This is a hierarchical name. Split it into the 1124 * parent and child names, and make sure the parent 1125 * exists or matches an already found jail. 1126 */ 1127 *namelc = '\0'; 1128 if (pr != NULL) { 1129 if (strncmp(name, ppr->pr_name, namelc - name) 1130 || ppr->pr_name[namelc - name] != '\0') { 1131 mtx_unlock(&pr->pr_mtx); 1132 error = EINVAL; 1133 vfs_opterror(opts, 1134 "cannot change jail's parent"); 1135 goto done_unlock_list; 1136 } 1137 } else { 1138 ppr = prison_find_name(mypr, name); 1139 if (ppr == NULL) { 1140 error = ENOENT; 1141 vfs_opterror(opts, 1142 "jail \"%s\" not found", name); 1143 goto done_unlock_list; 1144 } 1145 mtx_unlock(&ppr->pr_mtx); 1146 } 1147 name = ++namelc; 1148 } 1149 if (name[0] != '\0') { 1150 namelen = 1151 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1152 name_again: 1153 deadpr = NULL; 1154 FOREACH_PRISON_CHILD(ppr, tpr) { 1155 if (tpr != pr && tpr->pr_ref > 0 && 1156 !strcmp(tpr->pr_name + namelen, name)) { 1157 if (pr == NULL && 1158 cuflags != JAIL_CREATE) { 1159 mtx_lock(&tpr->pr_mtx); 1160 if (tpr->pr_ref > 0) { 1161 /* 1162 * Use this jail 1163 * for updates. 1164 */ 1165 if (tpr->pr_uref > 0) { 1166 pr = tpr; 1167 break; 1168 } 1169 deadpr = tpr; 1170 } 1171 mtx_unlock(&tpr->pr_mtx); 1172 } else if (tpr->pr_uref > 0) { 1173 /* 1174 * Create, or update(jid): 1175 * name must not exist in an 1176 * active sibling jail. 1177 */ 1178 error = EEXIST; 1179 if (pr != NULL) 1180 mtx_unlock(&pr->pr_mtx); 1181 vfs_opterror(opts, 1182 "jail \"%s\" already exists", 1183 name); 1184 goto done_unlock_list; 1185 } 1186 } 1187 } 1188 /* If no active jail is found, use a dying one. */ 1189 if (deadpr != NULL && pr == NULL) { 1190 if (flags & JAIL_DYING) { 1191 mtx_lock(&deadpr->pr_mtx); 1192 if (deadpr->pr_ref == 0) { 1193 mtx_unlock(&deadpr->pr_mtx); 1194 goto name_again; 1195 } 1196 pr = deadpr; 1197 } else if (cuflags == JAIL_UPDATE) { 1198 error = ENOENT; 1199 vfs_opterror(opts, 1200 "jail \"%s\" is dying", name); 1201 goto done_unlock_list; 1202 } 1203 } 1204 /* Update: name must exist if no jid. */ 1205 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1206 error = ENOENT; 1207 vfs_opterror(opts, "jail \"%s\" not found", 1208 name); 1209 goto done_unlock_list; 1210 } 1211 } 1212 } 1213 /* Update: must provide a jid or name. */ 1214 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1215 error = ENOENT; 1216 vfs_opterror(opts, "update specified no jail"); 1217 goto done_unlock_list; 1218 } 1219 1220 /* If there's no prison to update, create a new one and link it in. */ 1221 if (pr == NULL) { 1222 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1223 if (tpr->pr_childcount >= tpr->pr_childmax) { 1224 error = EPERM; 1225 vfs_opterror(opts, "prison limit exceeded"); 1226 goto done_unlock_list; 1227 } 1228 created = 1; 1229 mtx_lock(&ppr->pr_mtx); 1230 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) { 1231 mtx_unlock(&ppr->pr_mtx); 1232 error = ENOENT; 1233 vfs_opterror(opts, "parent jail went away!"); 1234 goto done_unlock_list; 1235 } 1236 ppr->pr_ref++; 1237 ppr->pr_uref++; 1238 mtx_unlock(&ppr->pr_mtx); 1239 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1240 if (jid == 0) { 1241 /* Find the next free jid. */ 1242 jid = lastprid + 1; 1243 findnext: 1244 if (jid == JAIL_MAX) 1245 jid = 1; 1246 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1247 if (tpr->pr_id < jid) 1248 continue; 1249 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1250 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1251 break; 1252 } 1253 if (jid == lastprid) { 1254 error = EAGAIN; 1255 vfs_opterror(opts, 1256 "no available jail IDs"); 1257 free(pr, M_PRISON); 1258 prison_deref(ppr, PD_DEREF | 1259 PD_DEUREF | PD_LIST_XLOCKED); 1260 goto done_releroot; 1261 } 1262 jid++; 1263 goto findnext; 1264 } 1265 lastprid = jid; 1266 } else { 1267 /* 1268 * The jail already has a jid (that did not yet exist), 1269 * so just find where to insert it. 1270 */ 1271 TAILQ_FOREACH(tpr, &allprison, pr_list) 1272 if (tpr->pr_id >= jid) { 1273 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1274 break; 1275 } 1276 } 1277 if (tpr == NULL) 1278 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1279 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1280 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1281 tpr->pr_childcount++; 1282 1283 pr->pr_parent = ppr; 1284 pr->pr_id = jid; 1285 1286 /* Set some default values, and inherit some from the parent. */ 1287 if (name == NULL) 1288 name = ""; 1289 if (path == NULL) { 1290 path = "/"; 1291 root = mypr->pr_root; 1292 vref(root); 1293 } 1294 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1295 pr->pr_flags |= PR_HOST; 1296 #if defined(INET) || defined(INET6) 1297 #ifdef VIMAGE 1298 if (!(pr_flags & PR_VNET)) 1299 #endif 1300 { 1301 #ifdef INET 1302 if (!(ch_flags & PR_IP4_USER)) 1303 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1304 else if (!(pr_flags & PR_IP4_USER)) { 1305 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1306 if (ppr->pr_ip4 != NULL) { 1307 pr->pr_ip4s = ppr->pr_ip4s; 1308 pr->pr_ip4 = malloc(pr->pr_ip4s * 1309 sizeof(struct in_addr), M_PRISON, 1310 M_WAITOK); 1311 bcopy(ppr->pr_ip4, pr->pr_ip4, 1312 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1313 } 1314 } 1315 #endif 1316 #ifdef INET6 1317 if (!(ch_flags & PR_IP6_USER)) 1318 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1319 else if (!(pr_flags & PR_IP6_USER)) { 1320 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1321 if (ppr->pr_ip6 != NULL) { 1322 pr->pr_ip6s = ppr->pr_ip6s; 1323 pr->pr_ip6 = malloc(pr->pr_ip6s * 1324 sizeof(struct in6_addr), M_PRISON, 1325 M_WAITOK); 1326 bcopy(ppr->pr_ip6, pr->pr_ip6, 1327 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1328 } 1329 } 1330 #endif 1331 } 1332 #endif 1333 /* Source address selection is always on by default. */ 1334 pr->pr_flags |= _PR_IP_SADDRSEL; 1335 1336 pr->pr_securelevel = ppr->pr_securelevel; 1337 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1338 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1339 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1340 1341 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1342 if (osrelstr == NULL) 1343 strcpy(pr->pr_osrelease, ppr->pr_osrelease); 1344 else 1345 strcpy(pr->pr_osrelease, osrelstr); 1346 1347 LIST_INIT(&pr->pr_children); 1348 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1349 1350 #ifdef VIMAGE 1351 /* Allocate a new vnet if specified. */ 1352 pr->pr_vnet = (pr_flags & PR_VNET) 1353 ? vnet_alloc() : ppr->pr_vnet; 1354 #endif 1355 /* 1356 * Allocate a dedicated cpuset for each jail. 1357 * Unlike other initial settings, this may return an erorr. 1358 */ 1359 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1360 if (error) { 1361 prison_deref(pr, PD_LIST_XLOCKED); 1362 goto done_releroot; 1363 } 1364 1365 mtx_lock(&pr->pr_mtx); 1366 /* 1367 * New prisons do not yet have a reference, because we do not 1368 * want other to see the incomplete prison once the 1369 * allprison_lock is downgraded. 1370 */ 1371 } else { 1372 created = 0; 1373 /* 1374 * Grab a reference for existing prisons, to ensure they 1375 * continue to exist for the duration of the call. 1376 */ 1377 pr->pr_ref++; 1378 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1379 if ((pr->pr_flags & PR_VNET) && 1380 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1381 error = EINVAL; 1382 vfs_opterror(opts, 1383 "vnet jails cannot have IP address restrictions"); 1384 goto done_deref_locked; 1385 } 1386 #endif 1387 #ifdef INET 1388 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1389 error = EINVAL; 1390 vfs_opterror(opts, 1391 "ip4 cannot be changed after creation"); 1392 goto done_deref_locked; 1393 } 1394 #endif 1395 #ifdef INET6 1396 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1397 error = EINVAL; 1398 vfs_opterror(opts, 1399 "ip6 cannot be changed after creation"); 1400 goto done_deref_locked; 1401 } 1402 #endif 1403 } 1404 1405 /* Do final error checking before setting anything. */ 1406 if (gotslevel) { 1407 if (slevel < ppr->pr_securelevel) { 1408 error = EPERM; 1409 goto done_deref_locked; 1410 } 1411 } 1412 if (gotchildmax) { 1413 if (childmax >= ppr->pr_childmax) { 1414 error = EPERM; 1415 goto done_deref_locked; 1416 } 1417 } 1418 if (gotenforce) { 1419 if (enforce < ppr->pr_enforce_statfs) { 1420 error = EPERM; 1421 goto done_deref_locked; 1422 } 1423 } 1424 if (gotrsnum) { 1425 /* 1426 * devfs_rsnum is a uint16_t 1427 */ 1428 if (rsnum < 0 || rsnum > 65535) { 1429 error = EINVAL; 1430 goto done_deref_locked; 1431 } 1432 /* 1433 * Nested jails always inherit parent's devfs ruleset 1434 */ 1435 if (jailed(td->td_ucred)) { 1436 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1437 error = EPERM; 1438 goto done_deref_locked; 1439 } else 1440 rsnum = ppr->pr_devfs_rsnum; 1441 } 1442 } 1443 #ifdef INET 1444 if (ip4s > 0) { 1445 if (ppr->pr_flags & PR_IP4) { 1446 /* 1447 * Make sure the new set of IP addresses is a 1448 * subset of the parent's list. Don't worry 1449 * about the parent being unlocked, as any 1450 * setting is done with allprison_lock held. 1451 */ 1452 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1453 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1454 break; 1455 if (ij == ppr->pr_ip4s) { 1456 error = EPERM; 1457 goto done_deref_locked; 1458 } 1459 if (ip4s > 1) { 1460 for (ii = ij = 1; ii < ip4s; ii++) { 1461 if (ip4[ii].s_addr == 1462 ppr->pr_ip4[0].s_addr) 1463 continue; 1464 for (; ij < ppr->pr_ip4s; ij++) 1465 if (ip4[ii].s_addr == 1466 ppr->pr_ip4[ij].s_addr) 1467 break; 1468 if (ij == ppr->pr_ip4s) 1469 break; 1470 } 1471 if (ij == ppr->pr_ip4s) { 1472 error = EPERM; 1473 goto done_deref_locked; 1474 } 1475 } 1476 } 1477 /* 1478 * Check for conflicting IP addresses. We permit them 1479 * if there is no more than one IP on each jail. If 1480 * there is a duplicate on a jail with more than one 1481 * IP stop checking and return error. 1482 */ 1483 tppr = ppr; 1484 #ifdef VIMAGE 1485 for (; tppr != &prison0; tppr = tppr->pr_parent) 1486 if (tppr->pr_flags & PR_VNET) 1487 break; 1488 #endif 1489 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1490 if (tpr == pr || 1491 #ifdef VIMAGE 1492 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1493 #endif 1494 tpr->pr_uref == 0) { 1495 descend = 0; 1496 continue; 1497 } 1498 if (!(tpr->pr_flags & PR_IP4_USER)) 1499 continue; 1500 descend = 0; 1501 if (tpr->pr_ip4 == NULL || 1502 (ip4s == 1 && tpr->pr_ip4s == 1)) 1503 continue; 1504 for (ii = 0; ii < ip4s; ii++) { 1505 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1506 error = EADDRINUSE; 1507 vfs_opterror(opts, 1508 "IPv4 addresses clash"); 1509 goto done_deref_locked; 1510 } 1511 } 1512 } 1513 } 1514 #endif 1515 #ifdef INET6 1516 if (ip6s > 0) { 1517 if (ppr->pr_flags & PR_IP6) { 1518 /* 1519 * Make sure the new set of IP addresses is a 1520 * subset of the parent's list. 1521 */ 1522 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1523 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1524 &ppr->pr_ip6[ij])) 1525 break; 1526 if (ij == ppr->pr_ip6s) { 1527 error = EPERM; 1528 goto done_deref_locked; 1529 } 1530 if (ip6s > 1) { 1531 for (ii = ij = 1; ii < ip6s; ii++) { 1532 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1533 &ppr->pr_ip6[0])) 1534 continue; 1535 for (; ij < ppr->pr_ip6s; ij++) 1536 if (IN6_ARE_ADDR_EQUAL( 1537 &ip6[ii], &ppr->pr_ip6[ij])) 1538 break; 1539 if (ij == ppr->pr_ip6s) 1540 break; 1541 } 1542 if (ij == ppr->pr_ip6s) { 1543 error = EPERM; 1544 goto done_deref_locked; 1545 } 1546 } 1547 } 1548 /* Check for conflicting IP addresses. */ 1549 tppr = ppr; 1550 #ifdef VIMAGE 1551 for (; tppr != &prison0; tppr = tppr->pr_parent) 1552 if (tppr->pr_flags & PR_VNET) 1553 break; 1554 #endif 1555 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1556 if (tpr == pr || 1557 #ifdef VIMAGE 1558 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1559 #endif 1560 tpr->pr_uref == 0) { 1561 descend = 0; 1562 continue; 1563 } 1564 if (!(tpr->pr_flags & PR_IP6_USER)) 1565 continue; 1566 descend = 0; 1567 if (tpr->pr_ip6 == NULL || 1568 (ip6s == 1 && tpr->pr_ip6s == 1)) 1569 continue; 1570 for (ii = 0; ii < ip6s; ii++) { 1571 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1572 error = EADDRINUSE; 1573 vfs_opterror(opts, 1574 "IPv6 addresses clash"); 1575 goto done_deref_locked; 1576 } 1577 } 1578 } 1579 } 1580 #endif 1581 onamelen = namelen = 0; 1582 if (name != NULL) { 1583 /* Give a default name of the jid. Also allow the name to be 1584 * explicitly the jid - but not any other number, and only in 1585 * normal form (no leading zero/etc). 1586 */ 1587 if (name[0] == '\0') 1588 snprintf(name = numbuf, sizeof(numbuf), "%d", jid); 1589 else if ((strtoul(namelc, &p, 10) != jid || 1590 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1591 error = EINVAL; 1592 vfs_opterror(opts, 1593 "name cannot be numeric (unless it is the jid)"); 1594 goto done_deref_locked; 1595 } 1596 /* 1597 * Make sure the name isn't too long for the prison or its 1598 * children. 1599 */ 1600 onamelen = strlen(pr->pr_name); 1601 namelen = strlen(name); 1602 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) { 1603 error = ENAMETOOLONG; 1604 goto done_deref_locked; 1605 } 1606 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1607 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1608 sizeof(pr->pr_name)) { 1609 error = ENAMETOOLONG; 1610 goto done_deref_locked; 1611 } 1612 } 1613 } 1614 if (pr_allow & ~ppr->pr_allow) { 1615 error = EPERM; 1616 goto done_deref_locked; 1617 } 1618 1619 /* Set the parameters of the prison. */ 1620 #ifdef INET 1621 redo_ip4 = 0; 1622 if (pr_flags & PR_IP4_USER) { 1623 pr->pr_flags |= PR_IP4; 1624 free(pr->pr_ip4, M_PRISON); 1625 pr->pr_ip4s = ip4s; 1626 pr->pr_ip4 = ip4; 1627 ip4 = NULL; 1628 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1629 #ifdef VIMAGE 1630 if (tpr->pr_flags & PR_VNET) { 1631 descend = 0; 1632 continue; 1633 } 1634 #endif 1635 if (prison_restrict_ip4(tpr, NULL)) { 1636 redo_ip4 = 1; 1637 descend = 0; 1638 } 1639 } 1640 } 1641 #endif 1642 #ifdef INET6 1643 redo_ip6 = 0; 1644 if (pr_flags & PR_IP6_USER) { 1645 pr->pr_flags |= PR_IP6; 1646 free(pr->pr_ip6, M_PRISON); 1647 pr->pr_ip6s = ip6s; 1648 pr->pr_ip6 = ip6; 1649 ip6 = NULL; 1650 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1651 #ifdef VIMAGE 1652 if (tpr->pr_flags & PR_VNET) { 1653 descend = 0; 1654 continue; 1655 } 1656 #endif 1657 if (prison_restrict_ip6(tpr, NULL)) { 1658 redo_ip6 = 1; 1659 descend = 0; 1660 } 1661 } 1662 } 1663 #endif 1664 if (gotslevel) { 1665 pr->pr_securelevel = slevel; 1666 /* Set all child jails to be at least this level. */ 1667 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1668 if (tpr->pr_securelevel < slevel) 1669 tpr->pr_securelevel = slevel; 1670 } 1671 if (gotchildmax) { 1672 pr->pr_childmax = childmax; 1673 /* Set all child jails to under this limit. */ 1674 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1675 if (tpr->pr_childmax > childmax - level) 1676 tpr->pr_childmax = childmax > level 1677 ? childmax - level : 0; 1678 } 1679 if (gotenforce) { 1680 pr->pr_enforce_statfs = enforce; 1681 /* Pass this restriction on to the children. */ 1682 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1683 if (tpr->pr_enforce_statfs < enforce) 1684 tpr->pr_enforce_statfs = enforce; 1685 } 1686 if (gotrsnum) { 1687 pr->pr_devfs_rsnum = rsnum; 1688 /* Pass this restriction on to the children. */ 1689 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1690 tpr->pr_devfs_rsnum = rsnum; 1691 } 1692 if (name != NULL) { 1693 if (ppr == &prison0) 1694 strlcpy(pr->pr_name, name, sizeof(pr->pr_name)); 1695 else 1696 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1697 ppr->pr_name, name); 1698 /* Change this component of child names. */ 1699 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1700 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1701 strlen(tpr->pr_name + onamelen) + 1); 1702 bcopy(pr->pr_name, tpr->pr_name, namelen); 1703 } 1704 } 1705 if (path != NULL) { 1706 /* Try to keep a real-rooted full pathname. */ 1707 if (fullpath_disabled && path[0] == '/' && 1708 strcmp(mypr->pr_path, "/")) 1709 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1710 mypr->pr_path, path); 1711 else 1712 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1713 pr->pr_root = root; 1714 } 1715 if (PR_HOST & ch_flags & ~pr_flags) { 1716 if (pr->pr_flags & PR_HOST) { 1717 /* 1718 * Copy the parent's host info. As with pr_ip4 above, 1719 * the lack of a lock on the parent is not a problem; 1720 * it is always set with allprison_lock at least 1721 * shared, and is held exclusively here. 1722 */ 1723 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1724 sizeof(pr->pr_hostname)); 1725 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1726 sizeof(pr->pr_domainname)); 1727 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1728 sizeof(pr->pr_hostuuid)); 1729 pr->pr_hostid = pr->pr_parent->pr_hostid; 1730 } 1731 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1732 /* Set this prison, and any descendants without PR_HOST. */ 1733 if (host != NULL) 1734 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1735 if (domain != NULL) 1736 strlcpy(pr->pr_domainname, domain, 1737 sizeof(pr->pr_domainname)); 1738 if (uuid != NULL) 1739 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1740 if (gothid) 1741 pr->pr_hostid = hid; 1742 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1743 if (tpr->pr_flags & PR_HOST) 1744 descend = 0; 1745 else { 1746 if (host != NULL) 1747 strlcpy(tpr->pr_hostname, 1748 pr->pr_hostname, 1749 sizeof(tpr->pr_hostname)); 1750 if (domain != NULL) 1751 strlcpy(tpr->pr_domainname, 1752 pr->pr_domainname, 1753 sizeof(tpr->pr_domainname)); 1754 if (uuid != NULL) 1755 strlcpy(tpr->pr_hostuuid, 1756 pr->pr_hostuuid, 1757 sizeof(tpr->pr_hostuuid)); 1758 if (gothid) 1759 tpr->pr_hostid = hid; 1760 } 1761 } 1762 } 1763 if ((tallow = ch_allow & ~pr_allow)) { 1764 /* Clear allow bits in all children. */ 1765 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1766 tpr->pr_allow &= ~tallow; 1767 } 1768 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1769 /* 1770 * Persistent prisons get an extra reference, and prisons losing their 1771 * persist flag lose that reference. Only do this for existing prisons 1772 * for now, so new ones will remain unseen until after the module 1773 * handlers have completed. 1774 */ 1775 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1776 if (pr_flags & PR_PERSIST) { 1777 pr->pr_ref++; 1778 pr->pr_uref++; 1779 } else { 1780 pr->pr_ref--; 1781 pr->pr_uref--; 1782 } 1783 } 1784 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1785 mtx_unlock(&pr->pr_mtx); 1786 1787 #ifdef RACCT 1788 if (racct_enable && created) 1789 prison_racct_attach(pr); 1790 #endif 1791 1792 /* Locks may have prevented a complete restriction of child IP 1793 * addresses. If so, allocate some more memory and try again. 1794 */ 1795 #ifdef INET 1796 while (redo_ip4) { 1797 ip4s = pr->pr_ip4s; 1798 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1799 mtx_lock(&pr->pr_mtx); 1800 redo_ip4 = 0; 1801 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1802 #ifdef VIMAGE 1803 if (tpr->pr_flags & PR_VNET) { 1804 descend = 0; 1805 continue; 1806 } 1807 #endif 1808 if (prison_restrict_ip4(tpr, ip4)) { 1809 if (ip4 != NULL) 1810 ip4 = NULL; 1811 else 1812 redo_ip4 = 1; 1813 } 1814 } 1815 mtx_unlock(&pr->pr_mtx); 1816 } 1817 #endif 1818 #ifdef INET6 1819 while (redo_ip6) { 1820 ip6s = pr->pr_ip6s; 1821 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1822 mtx_lock(&pr->pr_mtx); 1823 redo_ip6 = 0; 1824 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1825 #ifdef VIMAGE 1826 if (tpr->pr_flags & PR_VNET) { 1827 descend = 0; 1828 continue; 1829 } 1830 #endif 1831 if (prison_restrict_ip6(tpr, ip6)) { 1832 if (ip6 != NULL) 1833 ip6 = NULL; 1834 else 1835 redo_ip6 = 1; 1836 } 1837 } 1838 mtx_unlock(&pr->pr_mtx); 1839 } 1840 #endif 1841 1842 /* Let the modules do their work. */ 1843 sx_downgrade(&allprison_lock); 1844 if (created) { 1845 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1846 if (error) { 1847 prison_deref(pr, PD_LIST_SLOCKED); 1848 goto done_errmsg; 1849 } 1850 } 1851 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1852 if (error) { 1853 prison_deref(pr, created 1854 ? PD_LIST_SLOCKED 1855 : PD_DEREF | PD_LIST_SLOCKED); 1856 goto done_errmsg; 1857 } 1858 1859 /* Attach this process to the prison if requested. */ 1860 if (flags & JAIL_ATTACH) { 1861 mtx_lock(&pr->pr_mtx); 1862 error = do_jail_attach(td, pr); 1863 if (error) { 1864 vfs_opterror(opts, "attach failed"); 1865 if (!created) 1866 prison_deref(pr, PD_DEREF); 1867 goto done_errmsg; 1868 } 1869 } 1870 1871 #ifdef RACCT 1872 if (racct_enable && !created) { 1873 if (!(flags & JAIL_ATTACH)) 1874 sx_sunlock(&allprison_lock); 1875 prison_racct_modify(pr); 1876 if (!(flags & JAIL_ATTACH)) 1877 sx_slock(&allprison_lock); 1878 } 1879 #endif 1880 1881 td->td_retval[0] = pr->pr_id; 1882 1883 /* 1884 * Now that it is all there, drop the temporary reference from existing 1885 * prisons. Or add a reference to newly created persistent prisons 1886 * (which was not done earlier so that the prison would not be publicly 1887 * visible). 1888 */ 1889 if (!created) { 1890 prison_deref(pr, (flags & JAIL_ATTACH) 1891 ? PD_DEREF 1892 : PD_DEREF | PD_LIST_SLOCKED); 1893 } else { 1894 if (pr_flags & PR_PERSIST) { 1895 mtx_lock(&pr->pr_mtx); 1896 pr->pr_ref++; 1897 pr->pr_uref++; 1898 mtx_unlock(&pr->pr_mtx); 1899 } 1900 if (!(flags & JAIL_ATTACH)) 1901 sx_sunlock(&allprison_lock); 1902 } 1903 1904 goto done_errmsg; 1905 1906 done_deref_locked: 1907 prison_deref(pr, created 1908 ? PD_LOCKED | PD_LIST_XLOCKED 1909 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1910 goto done_releroot; 1911 done_unlock_list: 1912 sx_xunlock(&allprison_lock); 1913 done_releroot: 1914 if (root != NULL) 1915 vrele(root); 1916 done_errmsg: 1917 if (error) { 1918 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1919 if (errmsg_len > 0) { 1920 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1921 if (errmsg_pos > 0) { 1922 if (optuio->uio_segflg == UIO_SYSSPACE) 1923 bcopy(errmsg, 1924 optuio->uio_iov[errmsg_pos].iov_base, 1925 errmsg_len); 1926 else 1927 copyout(errmsg, 1928 optuio->uio_iov[errmsg_pos].iov_base, 1929 errmsg_len); 1930 } 1931 } 1932 } 1933 done_free: 1934 #ifdef INET 1935 free(ip4, M_PRISON); 1936 #endif 1937 #ifdef INET6 1938 free(ip6, M_PRISON); 1939 #endif 1940 if (g_path != NULL) 1941 free(g_path, M_TEMP); 1942 vfs_freeopts(opts); 1943 return (error); 1944 } 1945 1946 1947 /* 1948 * struct jail_get_args { 1949 * struct iovec *iovp; 1950 * unsigned int iovcnt; 1951 * int flags; 1952 * }; 1953 */ 1954 int 1955 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1956 { 1957 struct uio *auio; 1958 int error; 1959 1960 /* Check that we have an even number of iovecs. */ 1961 if (uap->iovcnt & 1) 1962 return (EINVAL); 1963 1964 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1965 if (error) 1966 return (error); 1967 error = kern_jail_get(td, auio, uap->flags); 1968 if (error == 0) 1969 error = copyout(auio->uio_iov, uap->iovp, 1970 uap->iovcnt * sizeof (struct iovec)); 1971 free(auio, M_IOV); 1972 return (error); 1973 } 1974 1975 int 1976 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1977 { 1978 struct prison *pr, *mypr; 1979 struct vfsopt *opt; 1980 struct vfsoptlist *opts; 1981 char *errmsg, *name; 1982 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1983 1984 if (flags & ~JAIL_GET_MASK) 1985 return (EINVAL); 1986 1987 /* Get the parameter list. */ 1988 error = vfs_buildopts(optuio, &opts); 1989 if (error) 1990 return (error); 1991 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1992 mypr = td->td_ucred->cr_prison; 1993 1994 /* 1995 * Find the prison specified by one of: lastjid, jid, name. 1996 */ 1997 sx_slock(&allprison_lock); 1998 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1999 if (error == 0) { 2000 TAILQ_FOREACH(pr, &allprison, pr_list) { 2001 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 2002 mtx_lock(&pr->pr_mtx); 2003 if (pr->pr_ref > 0 && 2004 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 2005 break; 2006 mtx_unlock(&pr->pr_mtx); 2007 } 2008 } 2009 if (pr != NULL) 2010 goto found_prison; 2011 error = ENOENT; 2012 vfs_opterror(opts, "no jail after %d", jid); 2013 goto done_unlock_list; 2014 } else if (error != ENOENT) 2015 goto done_unlock_list; 2016 2017 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 2018 if (error == 0) { 2019 if (jid != 0) { 2020 pr = prison_find_child(mypr, jid); 2021 if (pr != NULL) { 2022 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2023 mtx_unlock(&pr->pr_mtx); 2024 error = ENOENT; 2025 vfs_opterror(opts, "jail %d is dying", 2026 jid); 2027 goto done_unlock_list; 2028 } 2029 goto found_prison; 2030 } 2031 error = ENOENT; 2032 vfs_opterror(opts, "jail %d not found", jid); 2033 goto done_unlock_list; 2034 } 2035 } else if (error != ENOENT) 2036 goto done_unlock_list; 2037 2038 error = vfs_getopt(opts, "name", (void **)&name, &len); 2039 if (error == 0) { 2040 if (len == 0 || name[len - 1] != '\0') { 2041 error = EINVAL; 2042 goto done_unlock_list; 2043 } 2044 pr = prison_find_name(mypr, name); 2045 if (pr != NULL) { 2046 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2047 mtx_unlock(&pr->pr_mtx); 2048 error = ENOENT; 2049 vfs_opterror(opts, "jail \"%s\" is dying", 2050 name); 2051 goto done_unlock_list; 2052 } 2053 goto found_prison; 2054 } 2055 error = ENOENT; 2056 vfs_opterror(opts, "jail \"%s\" not found", name); 2057 goto done_unlock_list; 2058 } else if (error != ENOENT) 2059 goto done_unlock_list; 2060 2061 vfs_opterror(opts, "no jail specified"); 2062 error = ENOENT; 2063 goto done_unlock_list; 2064 2065 found_prison: 2066 /* Get the parameters of the prison. */ 2067 pr->pr_ref++; 2068 locked = PD_LOCKED; 2069 td->td_retval[0] = pr->pr_id; 2070 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2071 if (error != 0 && error != ENOENT) 2072 goto done_deref; 2073 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2074 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2075 if (error != 0 && error != ENOENT) 2076 goto done_deref; 2077 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2078 if (error != 0 && error != ENOENT) 2079 goto done_deref; 2080 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2081 sizeof(pr->pr_cpuset->cs_id)); 2082 if (error != 0 && error != ENOENT) 2083 goto done_deref; 2084 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2085 if (error != 0 && error != ENOENT) 2086 goto done_deref; 2087 #ifdef INET 2088 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2089 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2090 if (error != 0 && error != ENOENT) 2091 goto done_deref; 2092 #endif 2093 #ifdef INET6 2094 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2095 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2096 if (error != 0 && error != ENOENT) 2097 goto done_deref; 2098 #endif 2099 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2100 sizeof(pr->pr_securelevel)); 2101 if (error != 0 && error != ENOENT) 2102 goto done_deref; 2103 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2104 sizeof(pr->pr_childcount)); 2105 if (error != 0 && error != ENOENT) 2106 goto done_deref; 2107 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2108 sizeof(pr->pr_childmax)); 2109 if (error != 0 && error != ENOENT) 2110 goto done_deref; 2111 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2112 if (error != 0 && error != ENOENT) 2113 goto done_deref; 2114 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2115 if (error != 0 && error != ENOENT) 2116 goto done_deref; 2117 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2118 if (error != 0 && error != ENOENT) 2119 goto done_deref; 2120 #ifdef COMPAT_FREEBSD32 2121 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2122 uint32_t hid32 = pr->pr_hostid; 2123 2124 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2125 } else 2126 #endif 2127 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2128 sizeof(pr->pr_hostid)); 2129 if (error != 0 && error != ENOENT) 2130 goto done_deref; 2131 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2132 sizeof(pr->pr_enforce_statfs)); 2133 if (error != 0 && error != ENOENT) 2134 goto done_deref; 2135 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2136 sizeof(pr->pr_devfs_rsnum)); 2137 if (error != 0 && error != ENOENT) 2138 goto done_deref; 2139 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 2140 fi++) { 2141 if (pr_flag_names[fi] == NULL) 2142 continue; 2143 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2144 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2145 if (error != 0 && error != ENOENT) 2146 goto done_deref; 2147 i = !i; 2148 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2149 if (error != 0 && error != ENOENT) 2150 goto done_deref; 2151 } 2152 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 2153 fi++) { 2154 i = pr->pr_flags & 2155 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2156 i = pr_flag_jailsys[fi].disable && 2157 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2158 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2159 : JAIL_SYS_INHERIT; 2160 error = 2161 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2162 if (error != 0 && error != ENOENT) 2163 goto done_deref; 2164 } 2165 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 2166 fi++) { 2167 if (pr_allow_names[fi] == NULL) 2168 continue; 2169 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2170 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2171 if (error != 0 && error != ENOENT) 2172 goto done_deref; 2173 i = !i; 2174 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2175 if (error != 0 && error != ENOENT) 2176 goto done_deref; 2177 } 2178 i = (pr->pr_uref == 0); 2179 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2180 if (error != 0 && error != ENOENT) 2181 goto done_deref; 2182 i = !i; 2183 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2184 if (error != 0 && error != ENOENT) 2185 goto done_deref; 2186 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2187 sizeof(pr->pr_osreldate)); 2188 if (error != 0 && error != ENOENT) 2189 goto done_deref; 2190 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2191 if (error != 0 && error != ENOENT) 2192 goto done_deref; 2193 2194 /* Get the module parameters. */ 2195 mtx_unlock(&pr->pr_mtx); 2196 locked = 0; 2197 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2198 if (error) 2199 goto done_deref; 2200 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2201 2202 /* By now, all parameters should have been noted. */ 2203 TAILQ_FOREACH(opt, opts, link) { 2204 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2205 error = EINVAL; 2206 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2207 goto done_errmsg; 2208 } 2209 } 2210 2211 /* Write the fetched parameters back to userspace. */ 2212 error = 0; 2213 TAILQ_FOREACH(opt, opts, link) { 2214 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2215 pos = 2 * opt->pos + 1; 2216 optuio->uio_iov[pos].iov_len = opt->len; 2217 if (opt->value != NULL) { 2218 if (optuio->uio_segflg == UIO_SYSSPACE) { 2219 bcopy(opt->value, 2220 optuio->uio_iov[pos].iov_base, 2221 opt->len); 2222 } else { 2223 error = copyout(opt->value, 2224 optuio->uio_iov[pos].iov_base, 2225 opt->len); 2226 if (error) 2227 break; 2228 } 2229 } 2230 } 2231 } 2232 goto done_errmsg; 2233 2234 done_deref: 2235 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2236 goto done_errmsg; 2237 2238 done_unlock_list: 2239 sx_sunlock(&allprison_lock); 2240 done_errmsg: 2241 if (error && errmsg_pos >= 0) { 2242 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2243 errmsg_pos = 2 * errmsg_pos + 1; 2244 if (errmsg_len > 0) { 2245 if (optuio->uio_segflg == UIO_SYSSPACE) 2246 bcopy(errmsg, 2247 optuio->uio_iov[errmsg_pos].iov_base, 2248 errmsg_len); 2249 else 2250 copyout(errmsg, 2251 optuio->uio_iov[errmsg_pos].iov_base, 2252 errmsg_len); 2253 } 2254 } 2255 vfs_freeopts(opts); 2256 return (error); 2257 } 2258 2259 2260 /* 2261 * struct jail_remove_args { 2262 * int jid; 2263 * }; 2264 */ 2265 int 2266 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2267 { 2268 struct prison *pr, *cpr, *lpr, *tpr; 2269 int descend, error; 2270 2271 error = priv_check(td, PRIV_JAIL_REMOVE); 2272 if (error) 2273 return (error); 2274 2275 sx_xlock(&allprison_lock); 2276 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2277 if (pr == NULL) { 2278 sx_xunlock(&allprison_lock); 2279 return (EINVAL); 2280 } 2281 2282 /* Remove all descendants of this prison, then remove this prison. */ 2283 pr->pr_ref++; 2284 pr->pr_flags |= PR_REMOVE; 2285 if (!LIST_EMPTY(&pr->pr_children)) { 2286 mtx_unlock(&pr->pr_mtx); 2287 lpr = NULL; 2288 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2289 mtx_lock(&cpr->pr_mtx); 2290 if (cpr->pr_ref > 0) { 2291 tpr = cpr; 2292 cpr->pr_ref++; 2293 cpr->pr_flags |= PR_REMOVE; 2294 } else { 2295 /* Already removed - do not do it again. */ 2296 tpr = NULL; 2297 } 2298 mtx_unlock(&cpr->pr_mtx); 2299 if (lpr != NULL) { 2300 mtx_lock(&lpr->pr_mtx); 2301 prison_remove_one(lpr); 2302 sx_xlock(&allprison_lock); 2303 } 2304 lpr = tpr; 2305 } 2306 if (lpr != NULL) { 2307 mtx_lock(&lpr->pr_mtx); 2308 prison_remove_one(lpr); 2309 sx_xlock(&allprison_lock); 2310 } 2311 mtx_lock(&pr->pr_mtx); 2312 } 2313 prison_remove_one(pr); 2314 return (0); 2315 } 2316 2317 static void 2318 prison_remove_one(struct prison *pr) 2319 { 2320 struct proc *p; 2321 int deuref; 2322 2323 /* If the prison was persistent, it is not anymore. */ 2324 deuref = 0; 2325 if (pr->pr_flags & PR_PERSIST) { 2326 pr->pr_ref--; 2327 deuref = PD_DEUREF; 2328 pr->pr_flags &= ~PR_PERSIST; 2329 } 2330 2331 /* 2332 * jail_remove added a reference. If that's the only one, remove 2333 * the prison now. 2334 */ 2335 KASSERT(pr->pr_ref > 0, 2336 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2337 if (pr->pr_ref == 1) { 2338 prison_deref(pr, 2339 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2340 return; 2341 } 2342 2343 mtx_unlock(&pr->pr_mtx); 2344 sx_xunlock(&allprison_lock); 2345 /* 2346 * Kill all processes unfortunate enough to be attached to this prison. 2347 */ 2348 sx_slock(&allproc_lock); 2349 LIST_FOREACH(p, &allproc, p_list) { 2350 PROC_LOCK(p); 2351 if (p->p_state != PRS_NEW && p->p_ucred && 2352 p->p_ucred->cr_prison == pr) 2353 kern_psignal(p, SIGKILL); 2354 PROC_UNLOCK(p); 2355 } 2356 sx_sunlock(&allproc_lock); 2357 /* Remove the temporary reference added by jail_remove. */ 2358 prison_deref(pr, deuref | PD_DEREF); 2359 } 2360 2361 2362 /* 2363 * struct jail_attach_args { 2364 * int jid; 2365 * }; 2366 */ 2367 int 2368 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2369 { 2370 struct prison *pr; 2371 int error; 2372 2373 error = priv_check(td, PRIV_JAIL_ATTACH); 2374 if (error) 2375 return (error); 2376 2377 sx_slock(&allprison_lock); 2378 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2379 if (pr == NULL) { 2380 sx_sunlock(&allprison_lock); 2381 return (EINVAL); 2382 } 2383 2384 /* 2385 * Do not allow a process to attach to a prison that is not 2386 * considered to be "alive". 2387 */ 2388 if (pr->pr_uref == 0) { 2389 mtx_unlock(&pr->pr_mtx); 2390 sx_sunlock(&allprison_lock); 2391 return (EINVAL); 2392 } 2393 2394 return (do_jail_attach(td, pr)); 2395 } 2396 2397 static int 2398 do_jail_attach(struct thread *td, struct prison *pr) 2399 { 2400 struct prison *ppr; 2401 struct proc *p; 2402 struct ucred *newcred, *oldcred; 2403 int error; 2404 2405 /* 2406 * XXX: Note that there is a slight race here if two threads 2407 * in the same privileged process attempt to attach to two 2408 * different jails at the same time. It is important for 2409 * user processes not to do this, or they might end up with 2410 * a process root from one prison, but attached to the jail 2411 * of another. 2412 */ 2413 pr->pr_ref++; 2414 pr->pr_uref++; 2415 mtx_unlock(&pr->pr_mtx); 2416 2417 /* Let modules do whatever they need to prepare for attaching. */ 2418 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2419 if (error) { 2420 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2421 return (error); 2422 } 2423 sx_sunlock(&allprison_lock); 2424 2425 /* 2426 * Reparent the newly attached process to this jail. 2427 */ 2428 ppr = td->td_ucred->cr_prison; 2429 p = td->td_proc; 2430 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2431 if (error) 2432 goto e_revert_osd; 2433 2434 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2435 if ((error = change_dir(pr->pr_root, td)) != 0) 2436 goto e_unlock; 2437 #ifdef MAC 2438 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2439 goto e_unlock; 2440 #endif 2441 VOP_UNLOCK(pr->pr_root, 0); 2442 if ((error = pwd_chroot(td, pr->pr_root))) 2443 goto e_revert_osd; 2444 2445 newcred = crget(); 2446 PROC_LOCK(p); 2447 oldcred = p->p_ucred; 2448 setsugid(p); 2449 crcopy(newcred, oldcred); 2450 newcred->cr_prison = pr; 2451 proc_set_cred(p, newcred); 2452 PROC_UNLOCK(p); 2453 #ifdef RACCT 2454 racct_proc_ucred_changed(p, oldcred, newcred); 2455 #endif 2456 crfree(oldcred); 2457 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2458 return (0); 2459 e_unlock: 2460 VOP_UNLOCK(pr->pr_root, 0); 2461 e_revert_osd: 2462 /* Tell modules this thread is still in its old jail after all. */ 2463 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2464 prison_deref(pr, PD_DEREF | PD_DEUREF); 2465 return (error); 2466 } 2467 2468 2469 /* 2470 * Returns a locked prison instance, or NULL on failure. 2471 */ 2472 struct prison * 2473 prison_find(int prid) 2474 { 2475 struct prison *pr; 2476 2477 sx_assert(&allprison_lock, SX_LOCKED); 2478 TAILQ_FOREACH(pr, &allprison, pr_list) { 2479 if (pr->pr_id == prid) { 2480 mtx_lock(&pr->pr_mtx); 2481 if (pr->pr_ref > 0) 2482 return (pr); 2483 mtx_unlock(&pr->pr_mtx); 2484 } 2485 } 2486 return (NULL); 2487 } 2488 2489 /* 2490 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2491 */ 2492 struct prison * 2493 prison_find_child(struct prison *mypr, int prid) 2494 { 2495 struct prison *pr; 2496 int descend; 2497 2498 sx_assert(&allprison_lock, SX_LOCKED); 2499 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2500 if (pr->pr_id == prid) { 2501 mtx_lock(&pr->pr_mtx); 2502 if (pr->pr_ref > 0) 2503 return (pr); 2504 mtx_unlock(&pr->pr_mtx); 2505 } 2506 } 2507 return (NULL); 2508 } 2509 2510 /* 2511 * Look for the name relative to mypr. Returns a locked prison or NULL. 2512 */ 2513 struct prison * 2514 prison_find_name(struct prison *mypr, const char *name) 2515 { 2516 struct prison *pr, *deadpr; 2517 size_t mylen; 2518 int descend; 2519 2520 sx_assert(&allprison_lock, SX_LOCKED); 2521 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2522 again: 2523 deadpr = NULL; 2524 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2525 if (!strcmp(pr->pr_name + mylen, name)) { 2526 mtx_lock(&pr->pr_mtx); 2527 if (pr->pr_ref > 0) { 2528 if (pr->pr_uref > 0) 2529 return (pr); 2530 deadpr = pr; 2531 } 2532 mtx_unlock(&pr->pr_mtx); 2533 } 2534 } 2535 /* There was no valid prison - perhaps there was a dying one. */ 2536 if (deadpr != NULL) { 2537 mtx_lock(&deadpr->pr_mtx); 2538 if (deadpr->pr_ref == 0) { 2539 mtx_unlock(&deadpr->pr_mtx); 2540 goto again; 2541 } 2542 } 2543 return (deadpr); 2544 } 2545 2546 /* 2547 * See if a prison has the specific flag set. 2548 */ 2549 int 2550 prison_flag(struct ucred *cred, unsigned flag) 2551 { 2552 2553 /* This is an atomic read, so no locking is necessary. */ 2554 return (cred->cr_prison->pr_flags & flag); 2555 } 2556 2557 int 2558 prison_allow(struct ucred *cred, unsigned flag) 2559 { 2560 2561 /* This is an atomic read, so no locking is necessary. */ 2562 return (cred->cr_prison->pr_allow & flag); 2563 } 2564 2565 /* 2566 * Remove a prison reference. If that was the last reference, remove the 2567 * prison itself - but not in this context in case there are locks held. 2568 */ 2569 void 2570 prison_free_locked(struct prison *pr) 2571 { 2572 2573 mtx_assert(&pr->pr_mtx, MA_OWNED); 2574 pr->pr_ref--; 2575 if (pr->pr_ref == 0) { 2576 mtx_unlock(&pr->pr_mtx); 2577 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2578 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2579 return; 2580 } 2581 mtx_unlock(&pr->pr_mtx); 2582 } 2583 2584 void 2585 prison_free(struct prison *pr) 2586 { 2587 2588 mtx_lock(&pr->pr_mtx); 2589 prison_free_locked(pr); 2590 } 2591 2592 static void 2593 prison_complete(void *context, int pending) 2594 { 2595 2596 prison_deref((struct prison *)context, 0); 2597 } 2598 2599 /* 2600 * Remove a prison reference (usually). This internal version assumes no 2601 * mutexes are held, except perhaps the prison itself. If there are no more 2602 * references, release and delist the prison. On completion, the prison lock 2603 * and the allprison lock are both unlocked. 2604 */ 2605 static void 2606 prison_deref(struct prison *pr, int flags) 2607 { 2608 struct prison *ppr, *tpr; 2609 2610 if (!(flags & PD_LOCKED)) 2611 mtx_lock(&pr->pr_mtx); 2612 for (;;) { 2613 if (flags & PD_DEUREF) { 2614 pr->pr_uref--; 2615 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2616 } 2617 if (flags & PD_DEREF) 2618 pr->pr_ref--; 2619 /* If the prison still has references, nothing else to do. */ 2620 if (pr->pr_ref > 0) { 2621 mtx_unlock(&pr->pr_mtx); 2622 if (flags & PD_LIST_SLOCKED) 2623 sx_sunlock(&allprison_lock); 2624 else if (flags & PD_LIST_XLOCKED) 2625 sx_xunlock(&allprison_lock); 2626 return; 2627 } 2628 2629 mtx_unlock(&pr->pr_mtx); 2630 if (flags & PD_LIST_SLOCKED) { 2631 if (!sx_try_upgrade(&allprison_lock)) { 2632 sx_sunlock(&allprison_lock); 2633 sx_xlock(&allprison_lock); 2634 } 2635 } else if (!(flags & PD_LIST_XLOCKED)) 2636 sx_xlock(&allprison_lock); 2637 2638 TAILQ_REMOVE(&allprison, pr, pr_list); 2639 LIST_REMOVE(pr, pr_sibling); 2640 ppr = pr->pr_parent; 2641 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2642 tpr->pr_childcount--; 2643 sx_xunlock(&allprison_lock); 2644 2645 #ifdef VIMAGE 2646 if (pr->pr_vnet != ppr->pr_vnet) 2647 vnet_destroy(pr->pr_vnet); 2648 #endif 2649 if (pr->pr_root != NULL) 2650 vrele(pr->pr_root); 2651 mtx_destroy(&pr->pr_mtx); 2652 #ifdef INET 2653 free(pr->pr_ip4, M_PRISON); 2654 #endif 2655 #ifdef INET6 2656 free(pr->pr_ip6, M_PRISON); 2657 #endif 2658 if (pr->pr_cpuset != NULL) 2659 cpuset_rel(pr->pr_cpuset); 2660 osd_jail_exit(pr); 2661 #ifdef RACCT 2662 if (racct_enable) 2663 prison_racct_detach(pr); 2664 #endif 2665 free(pr, M_PRISON); 2666 2667 /* Removing a prison frees a reference on its parent. */ 2668 pr = ppr; 2669 mtx_lock(&pr->pr_mtx); 2670 flags = PD_DEREF | PD_DEUREF; 2671 } 2672 } 2673 2674 void 2675 prison_hold_locked(struct prison *pr) 2676 { 2677 2678 mtx_assert(&pr->pr_mtx, MA_OWNED); 2679 KASSERT(pr->pr_ref > 0, 2680 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2681 pr->pr_ref++; 2682 } 2683 2684 void 2685 prison_hold(struct prison *pr) 2686 { 2687 2688 mtx_lock(&pr->pr_mtx); 2689 prison_hold_locked(pr); 2690 mtx_unlock(&pr->pr_mtx); 2691 } 2692 2693 void 2694 prison_proc_hold(struct prison *pr) 2695 { 2696 2697 mtx_lock(&pr->pr_mtx); 2698 KASSERT(pr->pr_uref > 0, 2699 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2700 pr->pr_uref++; 2701 mtx_unlock(&pr->pr_mtx); 2702 } 2703 2704 void 2705 prison_proc_free(struct prison *pr) 2706 { 2707 2708 mtx_lock(&pr->pr_mtx); 2709 KASSERT(pr->pr_uref > 0, 2710 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2711 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2712 } 2713 2714 2715 #ifdef INET 2716 /* 2717 * Restrict a prison's IP address list with its parent's, possibly replacing 2718 * it. Return true if the replacement buffer was used (or would have been). 2719 */ 2720 static int 2721 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2722 { 2723 int ii, ij, used; 2724 struct prison *ppr; 2725 2726 ppr = pr->pr_parent; 2727 if (!(pr->pr_flags & PR_IP4_USER)) { 2728 /* This has no user settings, so just copy the parent's list. */ 2729 if (pr->pr_ip4s < ppr->pr_ip4s) { 2730 /* 2731 * There's no room for the parent's list. Use the 2732 * new list buffer, which is assumed to be big enough 2733 * (if it was passed). If there's no buffer, try to 2734 * allocate one. 2735 */ 2736 used = 1; 2737 if (newip4 == NULL) { 2738 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2739 M_PRISON, M_NOWAIT); 2740 if (newip4 != NULL) 2741 used = 0; 2742 } 2743 if (newip4 != NULL) { 2744 bcopy(ppr->pr_ip4, newip4, 2745 ppr->pr_ip4s * sizeof(*newip4)); 2746 free(pr->pr_ip4, M_PRISON); 2747 pr->pr_ip4 = newip4; 2748 pr->pr_ip4s = ppr->pr_ip4s; 2749 } 2750 return (used); 2751 } 2752 pr->pr_ip4s = ppr->pr_ip4s; 2753 if (pr->pr_ip4s > 0) 2754 bcopy(ppr->pr_ip4, pr->pr_ip4, 2755 pr->pr_ip4s * sizeof(*newip4)); 2756 else if (pr->pr_ip4 != NULL) { 2757 free(pr->pr_ip4, M_PRISON); 2758 pr->pr_ip4 = NULL; 2759 } 2760 } else if (pr->pr_ip4s > 0) { 2761 /* Remove addresses that aren't in the parent. */ 2762 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2763 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2764 break; 2765 if (ij < ppr->pr_ip4s) 2766 ii = 1; 2767 else { 2768 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2769 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2770 ii = 0; 2771 } 2772 for (ij = 1; ii < pr->pr_ip4s; ) { 2773 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2774 ii++; 2775 continue; 2776 } 2777 switch (ij >= ppr->pr_ip4s ? -1 : 2778 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2779 case -1: 2780 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2781 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2782 break; 2783 case 0: 2784 ii++; 2785 ij++; 2786 break; 2787 case 1: 2788 ij++; 2789 break; 2790 } 2791 } 2792 if (pr->pr_ip4s == 0) { 2793 free(pr->pr_ip4, M_PRISON); 2794 pr->pr_ip4 = NULL; 2795 } 2796 } 2797 return (0); 2798 } 2799 2800 /* 2801 * Pass back primary IPv4 address of this jail. 2802 * 2803 * If not restricted return success but do not alter the address. Caller has 2804 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2805 * 2806 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2807 * Address returned in NBO. 2808 */ 2809 int 2810 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2811 { 2812 struct prison *pr; 2813 2814 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2815 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2816 2817 pr = cred->cr_prison; 2818 if (!(pr->pr_flags & PR_IP4)) 2819 return (0); 2820 mtx_lock(&pr->pr_mtx); 2821 if (!(pr->pr_flags & PR_IP4)) { 2822 mtx_unlock(&pr->pr_mtx); 2823 return (0); 2824 } 2825 if (pr->pr_ip4 == NULL) { 2826 mtx_unlock(&pr->pr_mtx); 2827 return (EAFNOSUPPORT); 2828 } 2829 2830 ia->s_addr = pr->pr_ip4[0].s_addr; 2831 mtx_unlock(&pr->pr_mtx); 2832 return (0); 2833 } 2834 2835 /* 2836 * Return 1 if we should do proper source address selection or are not jailed. 2837 * We will return 0 if we should bypass source address selection in favour 2838 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2839 * returned in NBO. 2840 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2841 */ 2842 int 2843 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2844 { 2845 struct prison *pr; 2846 struct in_addr lia; 2847 int error; 2848 2849 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2850 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2851 2852 if (!jailed(cred)) 2853 return (1); 2854 2855 pr = cred->cr_prison; 2856 if (pr->pr_flags & PR_IP4_SADDRSEL) 2857 return (1); 2858 2859 lia.s_addr = INADDR_ANY; 2860 error = prison_get_ip4(cred, &lia); 2861 if (error) 2862 return (error); 2863 if (lia.s_addr == INADDR_ANY) 2864 return (1); 2865 2866 ia->s_addr = lia.s_addr; 2867 return (0); 2868 } 2869 2870 /* 2871 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2872 */ 2873 int 2874 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2875 { 2876 2877 if (pr1 == pr2) 2878 return (1); 2879 2880 /* 2881 * No need to lock since the PR_IP4_USER flag can't be altered for 2882 * existing prisons. 2883 */ 2884 while (pr1 != &prison0 && 2885 #ifdef VIMAGE 2886 !(pr1->pr_flags & PR_VNET) && 2887 #endif 2888 !(pr1->pr_flags & PR_IP4_USER)) 2889 pr1 = pr1->pr_parent; 2890 while (pr2 != &prison0 && 2891 #ifdef VIMAGE 2892 !(pr2->pr_flags & PR_VNET) && 2893 #endif 2894 !(pr2->pr_flags & PR_IP4_USER)) 2895 pr2 = pr2->pr_parent; 2896 return (pr1 == pr2); 2897 } 2898 2899 /* 2900 * Make sure our (source) address is set to something meaningful to this 2901 * jail. 2902 * 2903 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2904 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2905 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2906 */ 2907 int 2908 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2909 { 2910 struct prison *pr; 2911 struct in_addr ia0; 2912 int error; 2913 2914 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2915 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2916 2917 pr = cred->cr_prison; 2918 if (!(pr->pr_flags & PR_IP4)) 2919 return (0); 2920 mtx_lock(&pr->pr_mtx); 2921 if (!(pr->pr_flags & PR_IP4)) { 2922 mtx_unlock(&pr->pr_mtx); 2923 return (0); 2924 } 2925 if (pr->pr_ip4 == NULL) { 2926 mtx_unlock(&pr->pr_mtx); 2927 return (EAFNOSUPPORT); 2928 } 2929 2930 ia0.s_addr = ntohl(ia->s_addr); 2931 if (ia0.s_addr == INADDR_LOOPBACK) { 2932 ia->s_addr = pr->pr_ip4[0].s_addr; 2933 mtx_unlock(&pr->pr_mtx); 2934 return (0); 2935 } 2936 2937 if (ia0.s_addr == INADDR_ANY) { 2938 /* 2939 * In case there is only 1 IPv4 address, bind directly. 2940 */ 2941 if (pr->pr_ip4s == 1) 2942 ia->s_addr = pr->pr_ip4[0].s_addr; 2943 mtx_unlock(&pr->pr_mtx); 2944 return (0); 2945 } 2946 2947 error = _prison_check_ip4(pr, ia); 2948 mtx_unlock(&pr->pr_mtx); 2949 return (error); 2950 } 2951 2952 /* 2953 * Rewrite destination address in case we will connect to loopback address. 2954 * 2955 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2956 * Address passed in in NBO and returned in NBO. 2957 */ 2958 int 2959 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2960 { 2961 struct prison *pr; 2962 2963 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2964 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2965 2966 pr = cred->cr_prison; 2967 if (!(pr->pr_flags & PR_IP4)) 2968 return (0); 2969 mtx_lock(&pr->pr_mtx); 2970 if (!(pr->pr_flags & PR_IP4)) { 2971 mtx_unlock(&pr->pr_mtx); 2972 return (0); 2973 } 2974 if (pr->pr_ip4 == NULL) { 2975 mtx_unlock(&pr->pr_mtx); 2976 return (EAFNOSUPPORT); 2977 } 2978 2979 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2980 ia->s_addr = pr->pr_ip4[0].s_addr; 2981 mtx_unlock(&pr->pr_mtx); 2982 return (0); 2983 } 2984 2985 /* 2986 * Return success because nothing had to be changed. 2987 */ 2988 mtx_unlock(&pr->pr_mtx); 2989 return (0); 2990 } 2991 2992 /* 2993 * Check if given address belongs to the jail referenced by cred/prison. 2994 * 2995 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2996 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2997 * doesn't allow IPv4. Address passed in in NBO. 2998 */ 2999 static int 3000 _prison_check_ip4(const struct prison *pr, const struct in_addr *ia) 3001 { 3002 int i, a, z, d; 3003 3004 /* 3005 * Check the primary IP. 3006 */ 3007 if (pr->pr_ip4[0].s_addr == ia->s_addr) 3008 return (0); 3009 3010 /* 3011 * All the other IPs are sorted so we can do a binary search. 3012 */ 3013 a = 0; 3014 z = pr->pr_ip4s - 2; 3015 while (a <= z) { 3016 i = (a + z) / 2; 3017 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 3018 if (d > 0) 3019 z = i - 1; 3020 else if (d < 0) 3021 a = i + 1; 3022 else 3023 return (0); 3024 } 3025 3026 return (EADDRNOTAVAIL); 3027 } 3028 3029 int 3030 prison_check_ip4(const struct ucred *cred, const struct in_addr *ia) 3031 { 3032 struct prison *pr; 3033 int error; 3034 3035 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3036 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 3037 3038 pr = cred->cr_prison; 3039 if (!(pr->pr_flags & PR_IP4)) 3040 return (0); 3041 mtx_lock(&pr->pr_mtx); 3042 if (!(pr->pr_flags & PR_IP4)) { 3043 mtx_unlock(&pr->pr_mtx); 3044 return (0); 3045 } 3046 if (pr->pr_ip4 == NULL) { 3047 mtx_unlock(&pr->pr_mtx); 3048 return (EAFNOSUPPORT); 3049 } 3050 3051 error = _prison_check_ip4(pr, ia); 3052 mtx_unlock(&pr->pr_mtx); 3053 return (error); 3054 } 3055 #endif 3056 3057 #ifdef INET6 3058 static int 3059 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 3060 { 3061 int ii, ij, used; 3062 struct prison *ppr; 3063 3064 ppr = pr->pr_parent; 3065 if (!(pr->pr_flags & PR_IP6_USER)) { 3066 /* This has no user settings, so just copy the parent's list. */ 3067 if (pr->pr_ip6s < ppr->pr_ip6s) { 3068 /* 3069 * There's no room for the parent's list. Use the 3070 * new list buffer, which is assumed to be big enough 3071 * (if it was passed). If there's no buffer, try to 3072 * allocate one. 3073 */ 3074 used = 1; 3075 if (newip6 == NULL) { 3076 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 3077 M_PRISON, M_NOWAIT); 3078 if (newip6 != NULL) 3079 used = 0; 3080 } 3081 if (newip6 != NULL) { 3082 bcopy(ppr->pr_ip6, newip6, 3083 ppr->pr_ip6s * sizeof(*newip6)); 3084 free(pr->pr_ip6, M_PRISON); 3085 pr->pr_ip6 = newip6; 3086 pr->pr_ip6s = ppr->pr_ip6s; 3087 } 3088 return (used); 3089 } 3090 pr->pr_ip6s = ppr->pr_ip6s; 3091 if (pr->pr_ip6s > 0) 3092 bcopy(ppr->pr_ip6, pr->pr_ip6, 3093 pr->pr_ip6s * sizeof(*newip6)); 3094 else if (pr->pr_ip6 != NULL) { 3095 free(pr->pr_ip6, M_PRISON); 3096 pr->pr_ip6 = NULL; 3097 } 3098 } else if (pr->pr_ip6s > 0) { 3099 /* Remove addresses that aren't in the parent. */ 3100 for (ij = 0; ij < ppr->pr_ip6s; ij++) 3101 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 3102 &ppr->pr_ip6[ij])) 3103 break; 3104 if (ij < ppr->pr_ip6s) 3105 ii = 1; 3106 else { 3107 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 3108 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 3109 ii = 0; 3110 } 3111 for (ij = 1; ii < pr->pr_ip6s; ) { 3112 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 3113 &ppr->pr_ip6[0])) { 3114 ii++; 3115 continue; 3116 } 3117 switch (ij >= ppr->pr_ip6s ? -1 : 3118 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 3119 case -1: 3120 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 3121 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 3122 break; 3123 case 0: 3124 ii++; 3125 ij++; 3126 break; 3127 case 1: 3128 ij++; 3129 break; 3130 } 3131 } 3132 if (pr->pr_ip6s == 0) { 3133 free(pr->pr_ip6, M_PRISON); 3134 pr->pr_ip6 = NULL; 3135 } 3136 } 3137 return 0; 3138 } 3139 3140 /* 3141 * Pass back primary IPv6 address for this jail. 3142 * 3143 * If not restricted return success but do not alter the address. Caller has 3144 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3145 * 3146 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3147 */ 3148 int 3149 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3150 { 3151 struct prison *pr; 3152 3153 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3154 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3155 3156 pr = cred->cr_prison; 3157 if (!(pr->pr_flags & PR_IP6)) 3158 return (0); 3159 mtx_lock(&pr->pr_mtx); 3160 if (!(pr->pr_flags & PR_IP6)) { 3161 mtx_unlock(&pr->pr_mtx); 3162 return (0); 3163 } 3164 if (pr->pr_ip6 == NULL) { 3165 mtx_unlock(&pr->pr_mtx); 3166 return (EAFNOSUPPORT); 3167 } 3168 3169 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3170 mtx_unlock(&pr->pr_mtx); 3171 return (0); 3172 } 3173 3174 /* 3175 * Return 1 if we should do proper source address selection or are not jailed. 3176 * We will return 0 if we should bypass source address selection in favour 3177 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3178 * returned in NBO. 3179 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3180 */ 3181 int 3182 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3183 { 3184 struct prison *pr; 3185 struct in6_addr lia6; 3186 int error; 3187 3188 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3189 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3190 3191 if (!jailed(cred)) 3192 return (1); 3193 3194 pr = cred->cr_prison; 3195 if (pr->pr_flags & PR_IP6_SADDRSEL) 3196 return (1); 3197 3198 lia6 = in6addr_any; 3199 error = prison_get_ip6(cred, &lia6); 3200 if (error) 3201 return (error); 3202 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3203 return (1); 3204 3205 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3206 return (0); 3207 } 3208 3209 /* 3210 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3211 */ 3212 int 3213 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3214 { 3215 3216 if (pr1 == pr2) 3217 return (1); 3218 3219 while (pr1 != &prison0 && 3220 #ifdef VIMAGE 3221 !(pr1->pr_flags & PR_VNET) && 3222 #endif 3223 !(pr1->pr_flags & PR_IP6_USER)) 3224 pr1 = pr1->pr_parent; 3225 while (pr2 != &prison0 && 3226 #ifdef VIMAGE 3227 !(pr2->pr_flags & PR_VNET) && 3228 #endif 3229 !(pr2->pr_flags & PR_IP6_USER)) 3230 pr2 = pr2->pr_parent; 3231 return (pr1 == pr2); 3232 } 3233 3234 /* 3235 * Make sure our (source) address is set to something meaningful to this jail. 3236 * 3237 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3238 * when needed while binding. 3239 * 3240 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3241 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3242 * doesn't allow IPv6. 3243 */ 3244 int 3245 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3246 { 3247 struct prison *pr; 3248 int error; 3249 3250 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3251 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3252 3253 pr = cred->cr_prison; 3254 if (!(pr->pr_flags & PR_IP6)) 3255 return (0); 3256 mtx_lock(&pr->pr_mtx); 3257 if (!(pr->pr_flags & PR_IP6)) { 3258 mtx_unlock(&pr->pr_mtx); 3259 return (0); 3260 } 3261 if (pr->pr_ip6 == NULL) { 3262 mtx_unlock(&pr->pr_mtx); 3263 return (EAFNOSUPPORT); 3264 } 3265 3266 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3267 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3268 mtx_unlock(&pr->pr_mtx); 3269 return (0); 3270 } 3271 3272 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3273 /* 3274 * In case there is only 1 IPv6 address, and v6only is true, 3275 * then bind directly. 3276 */ 3277 if (v6only != 0 && pr->pr_ip6s == 1) 3278 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3279 mtx_unlock(&pr->pr_mtx); 3280 return (0); 3281 } 3282 3283 error = _prison_check_ip6(pr, ia6); 3284 mtx_unlock(&pr->pr_mtx); 3285 return (error); 3286 } 3287 3288 /* 3289 * Rewrite destination address in case we will connect to loopback address. 3290 * 3291 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3292 */ 3293 int 3294 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3295 { 3296 struct prison *pr; 3297 3298 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3299 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3300 3301 pr = cred->cr_prison; 3302 if (!(pr->pr_flags & PR_IP6)) 3303 return (0); 3304 mtx_lock(&pr->pr_mtx); 3305 if (!(pr->pr_flags & PR_IP6)) { 3306 mtx_unlock(&pr->pr_mtx); 3307 return (0); 3308 } 3309 if (pr->pr_ip6 == NULL) { 3310 mtx_unlock(&pr->pr_mtx); 3311 return (EAFNOSUPPORT); 3312 } 3313 3314 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3315 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3316 mtx_unlock(&pr->pr_mtx); 3317 return (0); 3318 } 3319 3320 /* 3321 * Return success because nothing had to be changed. 3322 */ 3323 mtx_unlock(&pr->pr_mtx); 3324 return (0); 3325 } 3326 3327 /* 3328 * Check if given address belongs to the jail referenced by cred/prison. 3329 * 3330 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3331 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3332 * doesn't allow IPv6. 3333 */ 3334 static int 3335 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3336 { 3337 int i, a, z, d; 3338 3339 /* 3340 * Check the primary IP. 3341 */ 3342 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3343 return (0); 3344 3345 /* 3346 * All the other IPs are sorted so we can do a binary search. 3347 */ 3348 a = 0; 3349 z = pr->pr_ip6s - 2; 3350 while (a <= z) { 3351 i = (a + z) / 2; 3352 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3353 if (d > 0) 3354 z = i - 1; 3355 else if (d < 0) 3356 a = i + 1; 3357 else 3358 return (0); 3359 } 3360 3361 return (EADDRNOTAVAIL); 3362 } 3363 3364 int 3365 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3366 { 3367 struct prison *pr; 3368 int error; 3369 3370 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3371 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3372 3373 pr = cred->cr_prison; 3374 if (!(pr->pr_flags & PR_IP6)) 3375 return (0); 3376 mtx_lock(&pr->pr_mtx); 3377 if (!(pr->pr_flags & PR_IP6)) { 3378 mtx_unlock(&pr->pr_mtx); 3379 return (0); 3380 } 3381 if (pr->pr_ip6 == NULL) { 3382 mtx_unlock(&pr->pr_mtx); 3383 return (EAFNOSUPPORT); 3384 } 3385 3386 error = _prison_check_ip6(pr, ia6); 3387 mtx_unlock(&pr->pr_mtx); 3388 return (error); 3389 } 3390 #endif 3391 3392 /* 3393 * Check if a jail supports the given address family. 3394 * 3395 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3396 * if not. 3397 */ 3398 int 3399 prison_check_af(struct ucred *cred, int af) 3400 { 3401 struct prison *pr; 3402 int error; 3403 3404 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3405 3406 pr = cred->cr_prison; 3407 #ifdef VIMAGE 3408 /* Prisons with their own network stack are not limited. */ 3409 if (prison_owns_vnet(cred)) 3410 return (0); 3411 #endif 3412 3413 error = 0; 3414 switch (af) 3415 { 3416 #ifdef INET 3417 case AF_INET: 3418 if (pr->pr_flags & PR_IP4) 3419 { 3420 mtx_lock(&pr->pr_mtx); 3421 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3422 error = EAFNOSUPPORT; 3423 mtx_unlock(&pr->pr_mtx); 3424 } 3425 break; 3426 #endif 3427 #ifdef INET6 3428 case AF_INET6: 3429 if (pr->pr_flags & PR_IP6) 3430 { 3431 mtx_lock(&pr->pr_mtx); 3432 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3433 error = EAFNOSUPPORT; 3434 mtx_unlock(&pr->pr_mtx); 3435 } 3436 break; 3437 #endif 3438 case AF_LOCAL: 3439 case AF_ROUTE: 3440 break; 3441 default: 3442 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3443 error = EAFNOSUPPORT; 3444 } 3445 return (error); 3446 } 3447 3448 /* 3449 * Check if given address belongs to the jail referenced by cred (wrapper to 3450 * prison_check_ip[46]). 3451 * 3452 * Returns 0 if jail doesn't restrict the address family or if address belongs 3453 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3454 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3455 */ 3456 int 3457 prison_if(struct ucred *cred, struct sockaddr *sa) 3458 { 3459 #ifdef INET 3460 struct sockaddr_in *sai; 3461 #endif 3462 #ifdef INET6 3463 struct sockaddr_in6 *sai6; 3464 #endif 3465 int error; 3466 3467 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3468 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3469 3470 #ifdef VIMAGE 3471 if (prison_owns_vnet(cred)) 3472 return (0); 3473 #endif 3474 3475 error = 0; 3476 switch (sa->sa_family) 3477 { 3478 #ifdef INET 3479 case AF_INET: 3480 sai = (struct sockaddr_in *)sa; 3481 error = prison_check_ip4(cred, &sai->sin_addr); 3482 break; 3483 #endif 3484 #ifdef INET6 3485 case AF_INET6: 3486 sai6 = (struct sockaddr_in6 *)sa; 3487 error = prison_check_ip6(cred, &sai6->sin6_addr); 3488 break; 3489 #endif 3490 default: 3491 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3492 error = EAFNOSUPPORT; 3493 } 3494 return (error); 3495 } 3496 3497 /* 3498 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3499 */ 3500 int 3501 prison_check(struct ucred *cred1, struct ucred *cred2) 3502 { 3503 3504 return ((cred1->cr_prison == cred2->cr_prison || 3505 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3506 } 3507 3508 /* 3509 * Return 1 if p2 is a child of p1, otherwise 0. 3510 */ 3511 int 3512 prison_ischild(struct prison *pr1, struct prison *pr2) 3513 { 3514 3515 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3516 if (pr1 == pr2) 3517 return (1); 3518 return (0); 3519 } 3520 3521 /* 3522 * Return 1 if the passed credential is in a jail, otherwise 0. 3523 */ 3524 int 3525 jailed(struct ucred *cred) 3526 { 3527 3528 return (cred->cr_prison != &prison0); 3529 } 3530 3531 /* 3532 * Return 1 if the passed credential is in a jail and that jail does not 3533 * have its own virtual network stack, otherwise 0. 3534 */ 3535 int 3536 jailed_without_vnet(struct ucred *cred) 3537 { 3538 3539 if (!jailed(cred)) 3540 return (0); 3541 #ifdef VIMAGE 3542 if (prison_owns_vnet(cred)) 3543 return (0); 3544 #endif 3545 3546 return (1); 3547 } 3548 3549 /* 3550 * Return the correct hostname (domainname, et al) for the passed credential. 3551 */ 3552 void 3553 getcredhostname(struct ucred *cred, char *buf, size_t size) 3554 { 3555 struct prison *pr; 3556 3557 /* 3558 * A NULL credential can be used to shortcut to the physical 3559 * system's hostname. 3560 */ 3561 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3562 mtx_lock(&pr->pr_mtx); 3563 strlcpy(buf, pr->pr_hostname, size); 3564 mtx_unlock(&pr->pr_mtx); 3565 } 3566 3567 void 3568 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3569 { 3570 3571 mtx_lock(&cred->cr_prison->pr_mtx); 3572 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3573 mtx_unlock(&cred->cr_prison->pr_mtx); 3574 } 3575 3576 void 3577 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3578 { 3579 3580 mtx_lock(&cred->cr_prison->pr_mtx); 3581 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3582 mtx_unlock(&cred->cr_prison->pr_mtx); 3583 } 3584 3585 void 3586 getcredhostid(struct ucred *cred, unsigned long *hostid) 3587 { 3588 3589 mtx_lock(&cred->cr_prison->pr_mtx); 3590 *hostid = cred->cr_prison->pr_hostid; 3591 mtx_unlock(&cred->cr_prison->pr_mtx); 3592 } 3593 3594 #ifdef VIMAGE 3595 /* 3596 * Determine whether the prison represented by cred owns 3597 * its vnet rather than having it inherited. 3598 * 3599 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3600 */ 3601 int 3602 prison_owns_vnet(struct ucred *cred) 3603 { 3604 3605 /* 3606 * vnets cannot be added/removed after jail creation, 3607 * so no need to lock here. 3608 */ 3609 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3610 } 3611 #endif 3612 3613 /* 3614 * Determine whether the subject represented by cred can "see" 3615 * status of a mount point. 3616 * Returns: 0 for permitted, ENOENT otherwise. 3617 * XXX: This function should be called cr_canseemount() and should be 3618 * placed in kern_prot.c. 3619 */ 3620 int 3621 prison_canseemount(struct ucred *cred, struct mount *mp) 3622 { 3623 struct prison *pr; 3624 struct statfs *sp; 3625 size_t len; 3626 3627 pr = cred->cr_prison; 3628 if (pr->pr_enforce_statfs == 0) 3629 return (0); 3630 if (pr->pr_root->v_mount == mp) 3631 return (0); 3632 if (pr->pr_enforce_statfs == 2) 3633 return (ENOENT); 3634 /* 3635 * If jail's chroot directory is set to "/" we should be able to see 3636 * all mount-points from inside a jail. 3637 * This is ugly check, but this is the only situation when jail's 3638 * directory ends with '/'. 3639 */ 3640 if (strcmp(pr->pr_path, "/") == 0) 3641 return (0); 3642 len = strlen(pr->pr_path); 3643 sp = &mp->mnt_stat; 3644 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3645 return (ENOENT); 3646 /* 3647 * Be sure that we don't have situation where jail's root directory 3648 * is "/some/path" and mount point is "/some/pathpath". 3649 */ 3650 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3651 return (ENOENT); 3652 return (0); 3653 } 3654 3655 void 3656 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3657 { 3658 char jpath[MAXPATHLEN]; 3659 struct prison *pr; 3660 size_t len; 3661 3662 pr = cred->cr_prison; 3663 if (pr->pr_enforce_statfs == 0) 3664 return; 3665 if (prison_canseemount(cred, mp) != 0) { 3666 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3667 strlcpy(sp->f_mntonname, "[restricted]", 3668 sizeof(sp->f_mntonname)); 3669 return; 3670 } 3671 if (pr->pr_root->v_mount == mp) { 3672 /* 3673 * Clear current buffer data, so we are sure nothing from 3674 * the valid path left there. 3675 */ 3676 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3677 *sp->f_mntonname = '/'; 3678 return; 3679 } 3680 /* 3681 * If jail's chroot directory is set to "/" we should be able to see 3682 * all mount-points from inside a jail. 3683 */ 3684 if (strcmp(pr->pr_path, "/") == 0) 3685 return; 3686 len = strlen(pr->pr_path); 3687 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3688 /* 3689 * Clear current buffer data, so we are sure nothing from 3690 * the valid path left there. 3691 */ 3692 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3693 if (*jpath == '\0') { 3694 /* Should never happen. */ 3695 *sp->f_mntonname = '/'; 3696 } else { 3697 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3698 } 3699 } 3700 3701 /* 3702 * Check with permission for a specific privilege is granted within jail. We 3703 * have a specific list of accepted privileges; the rest are denied. 3704 */ 3705 int 3706 prison_priv_check(struct ucred *cred, int priv) 3707 { 3708 3709 if (!jailed(cred)) 3710 return (0); 3711 3712 #ifdef VIMAGE 3713 /* 3714 * Privileges specific to prisons with a virtual network stack. 3715 * There might be a duplicate entry here in case the privilege 3716 * is only granted conditionally in the legacy jail case. 3717 */ 3718 switch (priv) { 3719 #ifdef notyet 3720 /* 3721 * NFS-specific privileges. 3722 */ 3723 case PRIV_NFS_DAEMON: 3724 case PRIV_NFS_LOCKD: 3725 #endif 3726 /* 3727 * Network stack privileges. 3728 */ 3729 case PRIV_NET_BRIDGE: 3730 case PRIV_NET_GRE: 3731 case PRIV_NET_BPF: 3732 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3733 case PRIV_NET_ROUTE: 3734 case PRIV_NET_TAP: 3735 case PRIV_NET_SETIFMTU: 3736 case PRIV_NET_SETIFFLAGS: 3737 case PRIV_NET_SETIFCAP: 3738 case PRIV_NET_SETIFDESCR: 3739 case PRIV_NET_SETIFNAME : 3740 case PRIV_NET_SETIFMETRIC: 3741 case PRIV_NET_SETIFPHYS: 3742 case PRIV_NET_SETIFMAC: 3743 case PRIV_NET_ADDMULTI: 3744 case PRIV_NET_DELMULTI: 3745 case PRIV_NET_HWIOCTL: 3746 case PRIV_NET_SETLLADDR: 3747 case PRIV_NET_ADDIFGROUP: 3748 case PRIV_NET_DELIFGROUP: 3749 case PRIV_NET_IFCREATE: 3750 case PRIV_NET_IFDESTROY: 3751 case PRIV_NET_ADDIFADDR: 3752 case PRIV_NET_DELIFADDR: 3753 case PRIV_NET_LAGG: 3754 case PRIV_NET_GIF: 3755 case PRIV_NET_SETIFVNET: 3756 case PRIV_NET_SETIFFIB: 3757 3758 /* 3759 * 802.11-related privileges. 3760 */ 3761 case PRIV_NET80211_GETKEY: 3762 #ifdef notyet 3763 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3764 #endif 3765 3766 #ifdef notyet 3767 /* 3768 * ATM privileges. 3769 */ 3770 case PRIV_NETATM_CFG: 3771 case PRIV_NETATM_ADD: 3772 case PRIV_NETATM_DEL: 3773 case PRIV_NETATM_SET: 3774 3775 /* 3776 * Bluetooth privileges. 3777 */ 3778 case PRIV_NETBLUETOOTH_RAW: 3779 #endif 3780 3781 /* 3782 * Netgraph and netgraph module privileges. 3783 */ 3784 case PRIV_NETGRAPH_CONTROL: 3785 #ifdef notyet 3786 case PRIV_NETGRAPH_TTY: 3787 #endif 3788 3789 /* 3790 * IPv4 and IPv6 privileges. 3791 */ 3792 case PRIV_NETINET_IPFW: 3793 case PRIV_NETINET_DIVERT: 3794 case PRIV_NETINET_PF: 3795 case PRIV_NETINET_DUMMYNET: 3796 case PRIV_NETINET_CARP: 3797 case PRIV_NETINET_MROUTE: 3798 case PRIV_NETINET_RAW: 3799 case PRIV_NETINET_ADDRCTRL6: 3800 case PRIV_NETINET_ND6: 3801 case PRIV_NETINET_SCOPE6: 3802 case PRIV_NETINET_ALIFETIME6: 3803 case PRIV_NETINET_IPSEC: 3804 case PRIV_NETINET_BINDANY: 3805 3806 #ifdef notyet 3807 /* 3808 * NCP privileges. 3809 */ 3810 case PRIV_NETNCP: 3811 3812 /* 3813 * SMB privileges. 3814 */ 3815 case PRIV_NETSMB: 3816 #endif 3817 3818 /* 3819 * No default: or deny here. 3820 * In case of no permit fall through to next switch(). 3821 */ 3822 if (cred->cr_prison->pr_flags & PR_VNET) 3823 return (0); 3824 } 3825 #endif /* VIMAGE */ 3826 3827 switch (priv) { 3828 3829 /* 3830 * Allow ktrace privileges for root in jail. 3831 */ 3832 case PRIV_KTRACE: 3833 3834 #if 0 3835 /* 3836 * Allow jailed processes to configure audit identity and 3837 * submit audit records (login, etc). In the future we may 3838 * want to further refine the relationship between audit and 3839 * jail. 3840 */ 3841 case PRIV_AUDIT_GETAUDIT: 3842 case PRIV_AUDIT_SETAUDIT: 3843 case PRIV_AUDIT_SUBMIT: 3844 #endif 3845 3846 /* 3847 * Allow jailed processes to manipulate process UNIX 3848 * credentials in any way they see fit. 3849 */ 3850 case PRIV_CRED_SETUID: 3851 case PRIV_CRED_SETEUID: 3852 case PRIV_CRED_SETGID: 3853 case PRIV_CRED_SETEGID: 3854 case PRIV_CRED_SETGROUPS: 3855 case PRIV_CRED_SETREUID: 3856 case PRIV_CRED_SETREGID: 3857 case PRIV_CRED_SETRESUID: 3858 case PRIV_CRED_SETRESGID: 3859 3860 /* 3861 * Jail implements visibility constraints already, so allow 3862 * jailed root to override uid/gid-based constraints. 3863 */ 3864 case PRIV_SEEOTHERGIDS: 3865 case PRIV_SEEOTHERUIDS: 3866 3867 /* 3868 * Jail implements inter-process debugging limits already, so 3869 * allow jailed root various debugging privileges. 3870 */ 3871 case PRIV_DEBUG_DIFFCRED: 3872 case PRIV_DEBUG_SUGID: 3873 case PRIV_DEBUG_UNPRIV: 3874 3875 /* 3876 * Allow jail to set various resource limits and login 3877 * properties, and for now, exceed process resource limits. 3878 */ 3879 case PRIV_PROC_LIMIT: 3880 case PRIV_PROC_SETLOGIN: 3881 case PRIV_PROC_SETRLIMIT: 3882 3883 /* 3884 * System V and POSIX IPC privileges are granted in jail. 3885 */ 3886 case PRIV_IPC_READ: 3887 case PRIV_IPC_WRITE: 3888 case PRIV_IPC_ADMIN: 3889 case PRIV_IPC_MSGSIZE: 3890 case PRIV_MQ_ADMIN: 3891 3892 /* 3893 * Jail operations within a jail work on child jails. 3894 */ 3895 case PRIV_JAIL_ATTACH: 3896 case PRIV_JAIL_SET: 3897 case PRIV_JAIL_REMOVE: 3898 3899 /* 3900 * Jail implements its own inter-process limits, so allow 3901 * root processes in jail to change scheduling on other 3902 * processes in the same jail. Likewise for signalling. 3903 */ 3904 case PRIV_SCHED_DIFFCRED: 3905 case PRIV_SCHED_CPUSET: 3906 case PRIV_SIGNAL_DIFFCRED: 3907 case PRIV_SIGNAL_SUGID: 3908 3909 /* 3910 * Allow jailed processes to write to sysctls marked as jail 3911 * writable. 3912 */ 3913 case PRIV_SYSCTL_WRITEJAIL: 3914 3915 /* 3916 * Allow root in jail to manage a variety of quota 3917 * properties. These should likely be conditional on a 3918 * configuration option. 3919 */ 3920 case PRIV_VFS_GETQUOTA: 3921 case PRIV_VFS_SETQUOTA: 3922 3923 /* 3924 * Since Jail relies on chroot() to implement file system 3925 * protections, grant many VFS privileges to root in jail. 3926 * Be careful to exclude mount-related and NFS-related 3927 * privileges. 3928 */ 3929 case PRIV_VFS_READ: 3930 case PRIV_VFS_WRITE: 3931 case PRIV_VFS_ADMIN: 3932 case PRIV_VFS_EXEC: 3933 case PRIV_VFS_LOOKUP: 3934 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3935 case PRIV_VFS_CHFLAGS_DEV: 3936 case PRIV_VFS_CHOWN: 3937 case PRIV_VFS_CHROOT: 3938 case PRIV_VFS_RETAINSUGID: 3939 case PRIV_VFS_FCHROOT: 3940 case PRIV_VFS_LINK: 3941 case PRIV_VFS_SETGID: 3942 case PRIV_VFS_STAT: 3943 case PRIV_VFS_STICKYFILE: 3944 3945 /* 3946 * As in the non-jail case, non-root users are expected to be 3947 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3948 * exists in the jail and they have permission to access it). 3949 */ 3950 case PRIV_KMEM_READ: 3951 return (0); 3952 3953 /* 3954 * Depending on the global setting, allow privilege of 3955 * setting system flags. 3956 */ 3957 case PRIV_VFS_SYSFLAGS: 3958 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3959 return (0); 3960 else 3961 return (EPERM); 3962 3963 /* 3964 * Depending on the global setting, allow privilege of 3965 * mounting/unmounting file systems. 3966 */ 3967 case PRIV_VFS_MOUNT: 3968 case PRIV_VFS_UNMOUNT: 3969 case PRIV_VFS_MOUNT_NONUSER: 3970 case PRIV_VFS_MOUNT_OWNER: 3971 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3972 cred->cr_prison->pr_enforce_statfs < 2) 3973 return (0); 3974 else 3975 return (EPERM); 3976 3977 /* 3978 * Allow jailed root to bind reserved ports and reuse in-use 3979 * ports. 3980 */ 3981 case PRIV_NETINET_RESERVEDPORT: 3982 case PRIV_NETINET_REUSEPORT: 3983 return (0); 3984 3985 /* 3986 * Allow jailed root to set certian IPv4/6 (option) headers. 3987 */ 3988 case PRIV_NETINET_SETHDROPTS: 3989 return (0); 3990 3991 /* 3992 * Conditionally allow creating raw sockets in jail. 3993 */ 3994 case PRIV_NETINET_RAW: 3995 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3996 return (0); 3997 else 3998 return (EPERM); 3999 4000 /* 4001 * Since jail implements its own visibility limits on netstat 4002 * sysctls, allow getcred. This allows identd to work in 4003 * jail. 4004 */ 4005 case PRIV_NETINET_GETCRED: 4006 return (0); 4007 4008 /* 4009 * Allow jailed root to set loginclass. 4010 */ 4011 case PRIV_PROC_SETLOGINCLASS: 4012 return (0); 4013 4014 default: 4015 /* 4016 * In all remaining cases, deny the privilege request. This 4017 * includes almost all network privileges, many system 4018 * configuration privileges. 4019 */ 4020 return (EPERM); 4021 } 4022 } 4023 4024 /* 4025 * Return the part of pr2's name that is relative to pr1, or the whole name 4026 * if it does not directly follow. 4027 */ 4028 4029 char * 4030 prison_name(struct prison *pr1, struct prison *pr2) 4031 { 4032 char *name; 4033 4034 /* Jails see themselves as "0" (if they see themselves at all). */ 4035 if (pr1 == pr2) 4036 return "0"; 4037 name = pr2->pr_name; 4038 if (prison_ischild(pr1, pr2)) { 4039 /* 4040 * pr1 isn't locked (and allprison_lock may not be either) 4041 * so its length can't be counted on. But the number of dots 4042 * can be counted on - and counted. 4043 */ 4044 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 4045 name = strchr(name, '.') + 1; 4046 } 4047 return (name); 4048 } 4049 4050 /* 4051 * Return the part of pr2's path that is relative to pr1, or the whole path 4052 * if it does not directly follow. 4053 */ 4054 static char * 4055 prison_path(struct prison *pr1, struct prison *pr2) 4056 { 4057 char *path1, *path2; 4058 int len1; 4059 4060 path1 = pr1->pr_path; 4061 path2 = pr2->pr_path; 4062 if (!strcmp(path1, "/")) 4063 return (path2); 4064 len1 = strlen(path1); 4065 if (strncmp(path1, path2, len1)) 4066 return (path2); 4067 if (path2[len1] == '\0') 4068 return "/"; 4069 if (path2[len1] == '/') 4070 return (path2 + len1); 4071 return (path2); 4072 } 4073 4074 4075 /* 4076 * Jail-related sysctls. 4077 */ 4078 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 4079 "Jails"); 4080 4081 static int 4082 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4083 { 4084 struct xprison *xp; 4085 struct prison *pr, *cpr; 4086 #ifdef INET 4087 struct in_addr *ip4 = NULL; 4088 int ip4s = 0; 4089 #endif 4090 #ifdef INET6 4091 struct in6_addr *ip6 = NULL; 4092 int ip6s = 0; 4093 #endif 4094 int descend, error; 4095 4096 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4097 pr = req->td->td_ucred->cr_prison; 4098 error = 0; 4099 sx_slock(&allprison_lock); 4100 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4101 #if defined(INET) || defined(INET6) 4102 again: 4103 #endif 4104 mtx_lock(&cpr->pr_mtx); 4105 #ifdef INET 4106 if (cpr->pr_ip4s > 0) { 4107 if (ip4s < cpr->pr_ip4s) { 4108 ip4s = cpr->pr_ip4s; 4109 mtx_unlock(&cpr->pr_mtx); 4110 ip4 = realloc(ip4, ip4s * 4111 sizeof(struct in_addr), M_TEMP, M_WAITOK); 4112 goto again; 4113 } 4114 bcopy(cpr->pr_ip4, ip4, 4115 cpr->pr_ip4s * sizeof(struct in_addr)); 4116 } 4117 #endif 4118 #ifdef INET6 4119 if (cpr->pr_ip6s > 0) { 4120 if (ip6s < cpr->pr_ip6s) { 4121 ip6s = cpr->pr_ip6s; 4122 mtx_unlock(&cpr->pr_mtx); 4123 ip6 = realloc(ip6, ip6s * 4124 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 4125 goto again; 4126 } 4127 bcopy(cpr->pr_ip6, ip6, 4128 cpr->pr_ip6s * sizeof(struct in6_addr)); 4129 } 4130 #endif 4131 if (cpr->pr_ref == 0) { 4132 mtx_unlock(&cpr->pr_mtx); 4133 continue; 4134 } 4135 bzero(xp, sizeof(*xp)); 4136 xp->pr_version = XPRISON_VERSION; 4137 xp->pr_id = cpr->pr_id; 4138 xp->pr_state = cpr->pr_uref > 0 4139 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4140 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4141 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4142 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4143 #ifdef INET 4144 xp->pr_ip4s = cpr->pr_ip4s; 4145 #endif 4146 #ifdef INET6 4147 xp->pr_ip6s = cpr->pr_ip6s; 4148 #endif 4149 mtx_unlock(&cpr->pr_mtx); 4150 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4151 if (error) 4152 break; 4153 #ifdef INET 4154 if (xp->pr_ip4s > 0) { 4155 error = SYSCTL_OUT(req, ip4, 4156 xp->pr_ip4s * sizeof(struct in_addr)); 4157 if (error) 4158 break; 4159 } 4160 #endif 4161 #ifdef INET6 4162 if (xp->pr_ip6s > 0) { 4163 error = SYSCTL_OUT(req, ip6, 4164 xp->pr_ip6s * sizeof(struct in6_addr)); 4165 if (error) 4166 break; 4167 } 4168 #endif 4169 } 4170 sx_sunlock(&allprison_lock); 4171 free(xp, M_TEMP); 4172 #ifdef INET 4173 free(ip4, M_TEMP); 4174 #endif 4175 #ifdef INET6 4176 free(ip6, M_TEMP); 4177 #endif 4178 return (error); 4179 } 4180 4181 SYSCTL_OID(_security_jail, OID_AUTO, list, 4182 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4183 sysctl_jail_list, "S", "List of active jails"); 4184 4185 static int 4186 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4187 { 4188 int error, injail; 4189 4190 injail = jailed(req->td->td_ucred); 4191 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4192 4193 return (error); 4194 } 4195 4196 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4197 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4198 sysctl_jail_jailed, "I", "Process in jail?"); 4199 4200 static int 4201 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4202 { 4203 int error, havevnet; 4204 #ifdef VIMAGE 4205 struct ucred *cred = req->td->td_ucred; 4206 4207 havevnet = jailed(cred) && prison_owns_vnet(cred); 4208 #else 4209 havevnet = 0; 4210 #endif 4211 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4212 4213 return (error); 4214 } 4215 4216 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4217 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4218 sysctl_jail_vnet, "I", "Jail owns VNET?"); 4219 4220 #if defined(INET) || defined(INET6) 4221 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4222 &jail_max_af_ips, 0, 4223 "Number of IP addresses a jail may have at most per address family"); 4224 #endif 4225 4226 /* 4227 * Default parameters for jail(2) compatability. For historical reasons, 4228 * the sysctl names have varying similarity to the parameter names. Prisons 4229 * just see their own parameters, and can't change them. 4230 */ 4231 static int 4232 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4233 { 4234 struct prison *pr; 4235 int allow, error, i; 4236 4237 pr = req->td->td_ucred->cr_prison; 4238 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4239 4240 /* Get the current flag value, and convert it to a boolean. */ 4241 i = (allow & arg2) ? 1 : 0; 4242 if (arg1 != NULL) 4243 i = !i; 4244 error = sysctl_handle_int(oidp, &i, 0, req); 4245 if (error || !req->newptr) 4246 return (error); 4247 i = i ? arg2 : 0; 4248 if (arg1 != NULL) 4249 i ^= arg2; 4250 /* 4251 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4252 * for writing. 4253 */ 4254 mtx_lock(&prison0.pr_mtx); 4255 jail_default_allow = (jail_default_allow & ~arg2) | i; 4256 mtx_unlock(&prison0.pr_mtx); 4257 return (0); 4258 } 4259 4260 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4261 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4262 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4263 "Processes in jail can set their hostnames"); 4264 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4265 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4266 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4267 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 4268 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4269 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4270 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4271 "Processes in jail can use System V IPC primitives"); 4272 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4273 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4274 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4275 "Prison root can create raw sockets"); 4276 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4277 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4278 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4279 "Processes in jail can alter system file flags"); 4280 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4281 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4282 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4283 "Processes in jail can mount/unmount jail-friendly file systems"); 4284 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 4285 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4286 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 4287 "Processes in jail can mount the devfs file system"); 4288 SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed, 4289 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4290 NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I", 4291 "Processes in jail can mount the fdescfs file system"); 4292 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 4293 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4294 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 4295 "Processes in jail can mount the nullfs file system"); 4296 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 4297 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4298 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 4299 "Processes in jail can mount the procfs file system"); 4300 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linprocfs_allowed, 4301 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4302 NULL, PR_ALLOW_MOUNT_LINPROCFS, sysctl_jail_default_allow, "I", 4303 "Processes in jail can mount the linprocfs file system"); 4304 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linsysfs_allowed, 4305 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4306 NULL, PR_ALLOW_MOUNT_LINSYSFS, sysctl_jail_default_allow, "I", 4307 "Processes in jail can mount the linsysfs file system"); 4308 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed, 4309 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4310 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I", 4311 "Processes in jail can mount the tmpfs file system"); 4312 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 4313 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4314 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 4315 "Processes in jail can mount the zfs file system"); 4316 4317 static int 4318 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4319 { 4320 struct prison *pr; 4321 int level, error; 4322 4323 pr = req->td->td_ucred->cr_prison; 4324 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4325 error = sysctl_handle_int(oidp, &level, 0, req); 4326 if (error || !req->newptr) 4327 return (error); 4328 *(int *)arg1 = level; 4329 return (0); 4330 } 4331 4332 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4333 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4334 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4335 sysctl_jail_default_level, "I", 4336 "Processes in jail cannot see all mounted file systems"); 4337 4338 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4339 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4340 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4341 sysctl_jail_default_level, "I", 4342 "Ruleset for the devfs filesystem in jail"); 4343 4344 /* 4345 * Nodes to describe jail parameters. Maximum length of string parameters 4346 * is returned in the string itself, and the other parameters exist merely 4347 * to make themselves and their types known. 4348 */ 4349 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4350 "Jail parameters"); 4351 4352 int 4353 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4354 { 4355 int i; 4356 long l; 4357 size_t s; 4358 char numbuf[12]; 4359 4360 switch (oidp->oid_kind & CTLTYPE) 4361 { 4362 case CTLTYPE_LONG: 4363 case CTLTYPE_ULONG: 4364 l = 0; 4365 #ifdef SCTL_MASK32 4366 if (!(req->flags & SCTL_MASK32)) 4367 #endif 4368 return (SYSCTL_OUT(req, &l, sizeof(l))); 4369 case CTLTYPE_INT: 4370 case CTLTYPE_UINT: 4371 i = 0; 4372 return (SYSCTL_OUT(req, &i, sizeof(i))); 4373 case CTLTYPE_STRING: 4374 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4375 return 4376 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4377 case CTLTYPE_STRUCT: 4378 s = (size_t)arg2; 4379 return (SYSCTL_OUT(req, &s, sizeof(s))); 4380 } 4381 return (0); 4382 } 4383 4384 /* 4385 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 4386 * jail creation time but cannot be changed in an existing jail. 4387 */ 4388 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4389 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4390 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4391 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4392 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4393 "I", "Jail secure level"); 4394 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 4395 "Jail value for kern.osreldate and uname -K"); 4396 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 4397 "Jail value for kern.osrelease and uname -r"); 4398 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4399 "I", "Jail cannot see all mounted file systems"); 4400 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4401 "I", "Ruleset for in-jail devfs mounts"); 4402 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4403 "B", "Jail persistence"); 4404 #ifdef VIMAGE 4405 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4406 "E,jailsys", "Virtual network stack"); 4407 #endif 4408 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4409 "B", "Jail is in the process of shutting down"); 4410 4411 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4412 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4413 "I", "Current number of child jails"); 4414 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4415 "I", "Maximum number of child jails"); 4416 4417 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4418 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4419 "Jail hostname"); 4420 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4421 "Jail NIS domainname"); 4422 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4423 "Jail host UUID"); 4424 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4425 "LU", "Jail host ID"); 4426 4427 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4428 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4429 4430 #ifdef INET 4431 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4432 "Jail IPv4 address virtualization"); 4433 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4434 "S,in_addr,a", "Jail IPv4 addresses"); 4435 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4436 "B", "Do (not) use IPv4 source address selection rather than the " 4437 "primary jail IPv4 address."); 4438 #endif 4439 #ifdef INET6 4440 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4441 "Jail IPv6 address virtualization"); 4442 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4443 "S,in6_addr,a", "Jail IPv6 addresses"); 4444 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4445 "B", "Do (not) use IPv6 source address selection rather than the " 4446 "primary jail IPv6 address."); 4447 #endif 4448 4449 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4450 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4451 "B", "Jail may set hostname"); 4452 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4453 "B", "Jail may use SYSV IPC"); 4454 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4455 "B", "Jail may create raw sockets"); 4456 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4457 "B", "Jail may alter system file flags"); 4458 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4459 "B", "Jail may set file quotas"); 4460 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4461 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4462 4463 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4464 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4465 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4466 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 4467 "B", "Jail may mount the devfs file system"); 4468 SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW, 4469 "B", "Jail may mount the fdescfs file system"); 4470 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 4471 "B", "Jail may mount the nullfs file system"); 4472 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 4473 "B", "Jail may mount the procfs file system"); 4474 SYSCTL_JAIL_PARAM(_allow_mount, linprocfs, CTLTYPE_INT | CTLFLAG_RW, 4475 "B", "Jail may mount the linprocfs file system"); 4476 SYSCTL_JAIL_PARAM(_allow_mount, linsysfs, CTLTYPE_INT | CTLFLAG_RW, 4477 "B", "Jail may mount the linsysfs file system"); 4478 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW, 4479 "B", "Jail may mount the tmpfs file system"); 4480 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 4481 "B", "Jail may mount the zfs file system"); 4482 4483 #ifdef RACCT 4484 void 4485 prison_racct_foreach(void (*callback)(struct racct *racct, 4486 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 4487 void *arg2, void *arg3) 4488 { 4489 struct prison_racct *prr; 4490 4491 ASSERT_RACCT_ENABLED(); 4492 4493 sx_slock(&allprison_lock); 4494 if (pre != NULL) 4495 (pre)(); 4496 LIST_FOREACH(prr, &allprison_racct, prr_next) 4497 (callback)(prr->prr_racct, arg2, arg3); 4498 if (post != NULL) 4499 (post)(); 4500 sx_sunlock(&allprison_lock); 4501 } 4502 4503 static struct prison_racct * 4504 prison_racct_find_locked(const char *name) 4505 { 4506 struct prison_racct *prr; 4507 4508 ASSERT_RACCT_ENABLED(); 4509 sx_assert(&allprison_lock, SA_XLOCKED); 4510 4511 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4512 return (NULL); 4513 4514 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4515 if (strcmp(name, prr->prr_name) != 0) 4516 continue; 4517 4518 /* Found prison_racct with a matching name? */ 4519 prison_racct_hold(prr); 4520 return (prr); 4521 } 4522 4523 /* Add new prison_racct. */ 4524 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4525 racct_create(&prr->prr_racct); 4526 4527 strcpy(prr->prr_name, name); 4528 refcount_init(&prr->prr_refcount, 1); 4529 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4530 4531 return (prr); 4532 } 4533 4534 struct prison_racct * 4535 prison_racct_find(const char *name) 4536 { 4537 struct prison_racct *prr; 4538 4539 ASSERT_RACCT_ENABLED(); 4540 4541 sx_xlock(&allprison_lock); 4542 prr = prison_racct_find_locked(name); 4543 sx_xunlock(&allprison_lock); 4544 return (prr); 4545 } 4546 4547 void 4548 prison_racct_hold(struct prison_racct *prr) 4549 { 4550 4551 ASSERT_RACCT_ENABLED(); 4552 4553 refcount_acquire(&prr->prr_refcount); 4554 } 4555 4556 static void 4557 prison_racct_free_locked(struct prison_racct *prr) 4558 { 4559 4560 ASSERT_RACCT_ENABLED(); 4561 sx_assert(&allprison_lock, SA_XLOCKED); 4562 4563 if (refcount_release(&prr->prr_refcount)) { 4564 racct_destroy(&prr->prr_racct); 4565 LIST_REMOVE(prr, prr_next); 4566 free(prr, M_PRISON_RACCT); 4567 } 4568 } 4569 4570 void 4571 prison_racct_free(struct prison_racct *prr) 4572 { 4573 int old; 4574 4575 ASSERT_RACCT_ENABLED(); 4576 sx_assert(&allprison_lock, SA_UNLOCKED); 4577 4578 old = prr->prr_refcount; 4579 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4580 return; 4581 4582 sx_xlock(&allprison_lock); 4583 prison_racct_free_locked(prr); 4584 sx_xunlock(&allprison_lock); 4585 } 4586 4587 static void 4588 prison_racct_attach(struct prison *pr) 4589 { 4590 struct prison_racct *prr; 4591 4592 ASSERT_RACCT_ENABLED(); 4593 sx_assert(&allprison_lock, SA_XLOCKED); 4594 4595 prr = prison_racct_find_locked(pr->pr_name); 4596 KASSERT(prr != NULL, ("cannot find prison_racct")); 4597 4598 pr->pr_prison_racct = prr; 4599 } 4600 4601 /* 4602 * Handle jail renaming. From the racct point of view, renaming means 4603 * moving from one prison_racct to another. 4604 */ 4605 static void 4606 prison_racct_modify(struct prison *pr) 4607 { 4608 struct proc *p; 4609 struct ucred *cred; 4610 struct prison_racct *oldprr; 4611 4612 ASSERT_RACCT_ENABLED(); 4613 4614 sx_slock(&allproc_lock); 4615 sx_xlock(&allprison_lock); 4616 4617 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4618 sx_xunlock(&allprison_lock); 4619 sx_sunlock(&allproc_lock); 4620 return; 4621 } 4622 4623 oldprr = pr->pr_prison_racct; 4624 pr->pr_prison_racct = NULL; 4625 4626 prison_racct_attach(pr); 4627 4628 /* 4629 * Move resource utilisation records. 4630 */ 4631 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4632 4633 /* 4634 * Force rctl to reattach rules to processes. 4635 */ 4636 FOREACH_PROC_IN_SYSTEM(p) { 4637 PROC_LOCK(p); 4638 cred = crhold(p->p_ucred); 4639 PROC_UNLOCK(p); 4640 racct_proc_ucred_changed(p, cred, cred); 4641 crfree(cred); 4642 } 4643 4644 sx_sunlock(&allproc_lock); 4645 prison_racct_free_locked(oldprr); 4646 sx_xunlock(&allprison_lock); 4647 } 4648 4649 static void 4650 prison_racct_detach(struct prison *pr) 4651 { 4652 4653 ASSERT_RACCT_ENABLED(); 4654 sx_assert(&allprison_lock, SA_UNLOCKED); 4655 4656 if (pr->pr_prison_racct == NULL) 4657 return; 4658 prison_racct_free(pr->pr_prison_racct); 4659 pr->pr_prison_racct = NULL; 4660 } 4661 #endif /* RACCT */ 4662 4663 #ifdef DDB 4664 4665 static void 4666 db_show_prison(struct prison *pr) 4667 { 4668 int fi; 4669 #if defined(INET) || defined(INET6) 4670 int ii; 4671 #endif 4672 unsigned jsf; 4673 #ifdef INET6 4674 char ip6buf[INET6_ADDRSTRLEN]; 4675 #endif 4676 4677 db_printf("prison %p:\n", pr); 4678 db_printf(" jid = %d\n", pr->pr_id); 4679 db_printf(" name = %s\n", pr->pr_name); 4680 db_printf(" parent = %p\n", pr->pr_parent); 4681 db_printf(" ref = %d\n", pr->pr_ref); 4682 db_printf(" uref = %d\n", pr->pr_uref); 4683 db_printf(" path = %s\n", pr->pr_path); 4684 db_printf(" cpuset = %d\n", pr->pr_cpuset 4685 ? pr->pr_cpuset->cs_id : -1); 4686 #ifdef VIMAGE 4687 db_printf(" vnet = %p\n", pr->pr_vnet); 4688 #endif 4689 db_printf(" root = %p\n", pr->pr_root); 4690 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4691 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4692 db_printf(" children.max = %d\n", pr->pr_childmax); 4693 db_printf(" children.cur = %d\n", pr->pr_childcount); 4694 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4695 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4696 db_printf(" flags = 0x%x", pr->pr_flags); 4697 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4698 fi++) 4699 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4700 db_printf(" %s", pr_flag_names[fi]); 4701 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4702 fi++) { 4703 jsf = pr->pr_flags & 4704 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4705 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4706 pr_flag_jailsys[fi].disable && 4707 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4708 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4709 : "inherit"); 4710 } 4711 db_printf(" allow = 0x%x", pr->pr_allow); 4712 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4713 fi++) 4714 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4715 db_printf(" %s", pr_allow_names[fi]); 4716 db_printf("\n"); 4717 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4718 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4719 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4720 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4721 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4722 #ifdef INET 4723 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4724 for (ii = 0; ii < pr->pr_ip4s; ii++) 4725 db_printf(" %s %s\n", 4726 ii == 0 ? "ip4.addr =" : " ", 4727 inet_ntoa(pr->pr_ip4[ii])); 4728 #endif 4729 #ifdef INET6 4730 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4731 for (ii = 0; ii < pr->pr_ip6s; ii++) 4732 db_printf(" %s %s\n", 4733 ii == 0 ? "ip6.addr =" : " ", 4734 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4735 #endif 4736 } 4737 4738 DB_SHOW_COMMAND(prison, db_show_prison_command) 4739 { 4740 struct prison *pr; 4741 4742 if (!have_addr) { 4743 /* 4744 * Show all prisons in the list, and prison0 which is not 4745 * listed. 4746 */ 4747 db_show_prison(&prison0); 4748 if (!db_pager_quit) { 4749 TAILQ_FOREACH(pr, &allprison, pr_list) { 4750 db_show_prison(pr); 4751 if (db_pager_quit) 4752 break; 4753 } 4754 } 4755 return; 4756 } 4757 4758 if (addr == 0) 4759 pr = &prison0; 4760 else { 4761 /* Look for a prison with the ID and with references. */ 4762 TAILQ_FOREACH(pr, &allprison, pr_list) 4763 if (pr->pr_id == addr && pr->pr_ref > 0) 4764 break; 4765 if (pr == NULL) 4766 /* Look again, without requiring a reference. */ 4767 TAILQ_FOREACH(pr, &allprison, pr_list) 4768 if (pr->pr_id == addr) 4769 break; 4770 if (pr == NULL) 4771 /* Assume address points to a valid prison. */ 4772 pr = (struct prison *)addr; 4773 } 4774 db_show_prison(pr); 4775 } 4776 4777 #endif /* DDB */ 4778