1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1999 Poul-Henning Kamp. 5 * Copyright (c) 2008 Bjoern A. Zeeb. 6 * Copyright (c) 2009 James Gritton. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include "opt_ddb.h" 35 #include "opt_inet.h" 36 #include "opt_inet6.h" 37 38 #include <sys/param.h> 39 #include <sys/types.h> 40 #include <sys/kernel.h> 41 #include <sys/systm.h> 42 #include <sys/errno.h> 43 #include <sys/sysproto.h> 44 #include <sys/malloc.h> 45 #include <sys/osd.h> 46 #include <sys/priv.h> 47 #include <sys/proc.h> 48 #include <sys/taskqueue.h> 49 #include <sys/fcntl.h> 50 #include <sys/jail.h> 51 #include <sys/lock.h> 52 #include <sys/mutex.h> 53 #include <sys/racct.h> 54 #include <sys/rctl.h> 55 #include <sys/refcount.h> 56 #include <sys/sx.h> 57 #include <sys/sysent.h> 58 #include <sys/namei.h> 59 #include <sys/mount.h> 60 #include <sys/queue.h> 61 #include <sys/socket.h> 62 #include <sys/syscallsubr.h> 63 #include <sys/sysctl.h> 64 #include <sys/vnode.h> 65 66 #include <net/if.h> 67 #include <net/vnet.h> 68 69 #include <netinet/in.h> 70 71 #ifdef DDB 72 #include <ddb/ddb.h> 73 #endif /* DDB */ 74 75 #include <security/mac/mac_framework.h> 76 77 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 78 79 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 80 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 81 82 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 83 #ifdef INET 84 #ifdef INET6 85 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 86 #else 87 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 88 #endif 89 #else /* !INET */ 90 #ifdef INET6 91 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 92 #else 93 #define _PR_IP_SADDRSEL 0 94 #endif 95 #endif 96 97 /* prison0 describes what is "real" about the system. */ 98 struct prison prison0 = { 99 .pr_id = 0, 100 .pr_name = "0", 101 .pr_ref = 1, 102 .pr_uref = 1, 103 .pr_path = "/", 104 .pr_securelevel = -1, 105 .pr_devfs_rsnum = 0, 106 .pr_childmax = JAIL_MAX, 107 .pr_hostuuid = DEFAULT_HOSTUUID, 108 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 109 #ifdef VIMAGE 110 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 111 #else 112 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 113 #endif 114 .pr_allow = PR_ALLOW_ALL_STATIC, 115 }; 116 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 117 118 struct bool_flags { 119 const char *name; 120 const char *noname; 121 unsigned flag; 122 }; 123 struct jailsys_flags { 124 const char *name; 125 unsigned disable; 126 unsigned new; 127 }; 128 129 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 130 struct sx allprison_lock; 131 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 132 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 133 LIST_HEAD(, prison_racct) allprison_racct; 134 int lastprid = 0; 135 136 static int do_jail_attach(struct thread *td, struct prison *pr); 137 static void prison_complete(void *context, int pending); 138 static void prison_deref(struct prison *pr, int flags); 139 static char *prison_path(struct prison *pr1, struct prison *pr2); 140 static void prison_remove_one(struct prison *pr); 141 #ifdef RACCT 142 static void prison_racct_attach(struct prison *pr); 143 static void prison_racct_modify(struct prison *pr); 144 static void prison_racct_detach(struct prison *pr); 145 #endif 146 147 /* Flags for prison_deref */ 148 #define PD_DEREF 0x01 149 #define PD_DEUREF 0x02 150 #define PD_LOCKED 0x04 151 #define PD_LIST_SLOCKED 0x08 152 #define PD_LIST_XLOCKED 0x10 153 154 /* 155 * Parameter names corresponding to PR_* flag values. Size values are for kvm 156 * as we cannot figure out the size of a sparse array, or an array without a 157 * terminating entry. 158 */ 159 static struct bool_flags pr_flag_bool[] = { 160 {"persist", "nopersist", PR_PERSIST}, 161 #ifdef INET 162 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL}, 163 #endif 164 #ifdef INET6 165 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL}, 166 #endif 167 }; 168 const size_t pr_flag_bool_size = sizeof(pr_flag_bool); 169 170 static struct jailsys_flags pr_flag_jailsys[] = { 171 {"host", 0, PR_HOST}, 172 #ifdef VIMAGE 173 {"vnet", 0, PR_VNET}, 174 #endif 175 #ifdef INET 176 {"ip4", PR_IP4_USER, PR_IP4_USER}, 177 #endif 178 #ifdef INET6 179 {"ip6", PR_IP6_USER, PR_IP6_USER}, 180 #endif 181 }; 182 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 183 184 /* Make this array full-size so dynamic parameters can be added. */ 185 static struct bool_flags pr_flag_allow[NBBY * NBPW] = { 186 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME}, 187 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC}, 188 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS}, 189 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS}, 190 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT}, 191 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS}, 192 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF}, 193 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK}, 194 {"allow.reserved_ports", "allow.noreserved_ports", 195 PR_ALLOW_RESERVED_PORTS}, 196 }; 197 const size_t pr_flag_allow_size = sizeof(pr_flag_allow); 198 199 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | PR_ALLOW_RESERVED_PORTS) 200 #define JAIL_DEFAULT_ENFORCE_STATFS 2 201 #define JAIL_DEFAULT_DEVFS_RSNUM 0 202 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 203 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 204 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 205 #if defined(INET) || defined(INET6) 206 static unsigned jail_max_af_ips = 255; 207 #endif 208 209 /* 210 * Initialize the parts of prison0 that can't be static-initialized with 211 * constants. This is called from proc0_init() after creating thread0 cpuset. 212 */ 213 void 214 prison0_init(void) 215 { 216 217 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 218 prison0.pr_osreldate = osreldate; 219 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 220 } 221 222 /* 223 * struct jail_args { 224 * struct jail *jail; 225 * }; 226 */ 227 int 228 sys_jail(struct thread *td, struct jail_args *uap) 229 { 230 uint32_t version; 231 int error; 232 struct jail j; 233 234 error = copyin(uap->jail, &version, sizeof(uint32_t)); 235 if (error) 236 return (error); 237 238 switch (version) { 239 case 0: 240 { 241 struct jail_v0 j0; 242 243 /* FreeBSD single IPv4 jails. */ 244 bzero(&j, sizeof(struct jail)); 245 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 246 if (error) 247 return (error); 248 j.version = j0.version; 249 j.path = j0.path; 250 j.hostname = j0.hostname; 251 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 252 break; 253 } 254 255 case 1: 256 /* 257 * Version 1 was used by multi-IPv4 jail implementations 258 * that never made it into the official kernel. 259 */ 260 return (EINVAL); 261 262 case 2: /* JAIL_API_VERSION */ 263 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 264 error = copyin(uap->jail, &j, sizeof(struct jail)); 265 if (error) 266 return (error); 267 break; 268 269 default: 270 /* Sci-Fi jails are not supported, sorry. */ 271 return (EINVAL); 272 } 273 return (kern_jail(td, &j)); 274 } 275 276 int 277 kern_jail(struct thread *td, struct jail *j) 278 { 279 struct iovec optiov[2 * (4 + nitems(pr_flag_allow) 280 #ifdef INET 281 + 1 282 #endif 283 #ifdef INET6 284 + 1 285 #endif 286 )]; 287 struct uio opt; 288 char *u_path, *u_hostname, *u_name; 289 struct bool_flags *bf; 290 #ifdef INET 291 uint32_t ip4s; 292 struct in_addr *u_ip4; 293 #endif 294 #ifdef INET6 295 struct in6_addr *u_ip6; 296 #endif 297 size_t tmplen; 298 int error, enforce_statfs; 299 300 bzero(&optiov, sizeof(optiov)); 301 opt.uio_iov = optiov; 302 opt.uio_iovcnt = 0; 303 opt.uio_offset = -1; 304 opt.uio_resid = -1; 305 opt.uio_segflg = UIO_SYSSPACE; 306 opt.uio_rw = UIO_READ; 307 opt.uio_td = td; 308 309 /* Set permissions for top-level jails from sysctls. */ 310 if (!jailed(td->td_ucred)) { 311 for (bf = pr_flag_allow; 312 bf < pr_flag_allow + nitems(pr_flag_allow) && 313 bf->flag != 0; 314 bf++) { 315 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *, 316 (jail_default_allow & bf->flag) 317 ? bf->name : bf->noname); 318 optiov[opt.uio_iovcnt].iov_len = 319 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 320 opt.uio_iovcnt += 2; 321 } 322 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 323 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 324 opt.uio_iovcnt++; 325 enforce_statfs = jail_default_enforce_statfs; 326 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 327 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 328 opt.uio_iovcnt++; 329 } 330 331 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 332 #ifdef INET 333 ip4s = (j->version == 0) ? 1 : j->ip4s; 334 if (ip4s > jail_max_af_ips) 335 return (EINVAL); 336 tmplen += ip4s * sizeof(struct in_addr); 337 #else 338 if (j->ip4s > 0) 339 return (EINVAL); 340 #endif 341 #ifdef INET6 342 if (j->ip6s > jail_max_af_ips) 343 return (EINVAL); 344 tmplen += j->ip6s * sizeof(struct in6_addr); 345 #else 346 if (j->ip6s > 0) 347 return (EINVAL); 348 #endif 349 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 350 u_hostname = u_path + MAXPATHLEN; 351 u_name = u_hostname + MAXHOSTNAMELEN; 352 #ifdef INET 353 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 354 #endif 355 #ifdef INET6 356 #ifdef INET 357 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 358 #else 359 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 360 #endif 361 #endif 362 optiov[opt.uio_iovcnt].iov_base = "path"; 363 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 364 opt.uio_iovcnt++; 365 optiov[opt.uio_iovcnt].iov_base = u_path; 366 error = copyinstr(j->path, u_path, MAXPATHLEN, 367 &optiov[opt.uio_iovcnt].iov_len); 368 if (error) { 369 free(u_path, M_TEMP); 370 return (error); 371 } 372 opt.uio_iovcnt++; 373 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 374 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 375 opt.uio_iovcnt++; 376 optiov[opt.uio_iovcnt].iov_base = u_hostname; 377 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 378 &optiov[opt.uio_iovcnt].iov_len); 379 if (error) { 380 free(u_path, M_TEMP); 381 return (error); 382 } 383 opt.uio_iovcnt++; 384 if (j->jailname != NULL) { 385 optiov[opt.uio_iovcnt].iov_base = "name"; 386 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 387 opt.uio_iovcnt++; 388 optiov[opt.uio_iovcnt].iov_base = u_name; 389 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 390 &optiov[opt.uio_iovcnt].iov_len); 391 if (error) { 392 free(u_path, M_TEMP); 393 return (error); 394 } 395 opt.uio_iovcnt++; 396 } 397 #ifdef INET 398 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 399 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 400 opt.uio_iovcnt++; 401 optiov[opt.uio_iovcnt].iov_base = u_ip4; 402 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 403 if (j->version == 0) 404 u_ip4->s_addr = j->ip4s; 405 else { 406 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 407 if (error) { 408 free(u_path, M_TEMP); 409 return (error); 410 } 411 } 412 opt.uio_iovcnt++; 413 #endif 414 #ifdef INET6 415 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 416 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 417 opt.uio_iovcnt++; 418 optiov[opt.uio_iovcnt].iov_base = u_ip6; 419 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 420 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 421 if (error) { 422 free(u_path, M_TEMP); 423 return (error); 424 } 425 opt.uio_iovcnt++; 426 #endif 427 KASSERT(opt.uio_iovcnt <= nitems(optiov), 428 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 429 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 430 free(u_path, M_TEMP); 431 return (error); 432 } 433 434 435 /* 436 * struct jail_set_args { 437 * struct iovec *iovp; 438 * unsigned int iovcnt; 439 * int flags; 440 * }; 441 */ 442 int 443 sys_jail_set(struct thread *td, struct jail_set_args *uap) 444 { 445 struct uio *auio; 446 int error; 447 448 /* Check that we have an even number of iovecs. */ 449 if (uap->iovcnt & 1) 450 return (EINVAL); 451 452 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 453 if (error) 454 return (error); 455 error = kern_jail_set(td, auio, uap->flags); 456 free(auio, M_IOV); 457 return (error); 458 } 459 460 int 461 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 462 { 463 struct nameidata nd; 464 #ifdef INET 465 struct in_addr *ip4; 466 #endif 467 #ifdef INET6 468 struct in6_addr *ip6; 469 #endif 470 struct vfsopt *opt; 471 struct vfsoptlist *opts; 472 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 473 struct vnode *root; 474 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 475 char *g_path, *osrelstr; 476 struct bool_flags *bf; 477 struct jailsys_flags *jsf; 478 #if defined(INET) || defined(INET6) 479 struct prison *tppr; 480 void *op; 481 #endif 482 unsigned long hid; 483 size_t namelen, onamelen, pnamelen; 484 int born, created, cuflags, descend, enforce; 485 int error, errmsg_len, errmsg_pos; 486 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 487 int jid, jsys, len, level; 488 int childmax, osreldt, rsnum, slevel; 489 int fullpath_disabled; 490 #if defined(INET) || defined(INET6) 491 int ii, ij; 492 #endif 493 #ifdef INET 494 int ip4s, redo_ip4; 495 #endif 496 #ifdef INET6 497 int ip6s, redo_ip6; 498 #endif 499 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 500 unsigned tallow; 501 char numbuf[12]; 502 503 error = priv_check(td, PRIV_JAIL_SET); 504 if (!error && (flags & JAIL_ATTACH)) 505 error = priv_check(td, PRIV_JAIL_ATTACH); 506 if (error) 507 return (error); 508 mypr = td->td_ucred->cr_prison; 509 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 510 return (EPERM); 511 if (flags & ~JAIL_SET_MASK) 512 return (EINVAL); 513 514 /* 515 * Check all the parameters before committing to anything. Not all 516 * errors can be caught early, but we may as well try. Also, this 517 * takes care of some expensive stuff (path lookup) before getting 518 * the allprison lock. 519 * 520 * XXX Jails are not filesystems, and jail parameters are not mount 521 * options. But it makes more sense to re-use the vfsopt code 522 * than duplicate it under a different name. 523 */ 524 error = vfs_buildopts(optuio, &opts); 525 if (error) 526 return (error); 527 #ifdef INET 528 ip4 = NULL; 529 #endif 530 #ifdef INET6 531 ip6 = NULL; 532 #endif 533 g_path = NULL; 534 535 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 536 if (!cuflags) { 537 error = EINVAL; 538 vfs_opterror(opts, "no valid operation (create or update)"); 539 goto done_errmsg; 540 } 541 542 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 543 if (error == ENOENT) 544 jid = 0; 545 else if (error != 0) 546 goto done_free; 547 548 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 549 if (error == ENOENT) 550 gotslevel = 0; 551 else if (error != 0) 552 goto done_free; 553 else 554 gotslevel = 1; 555 556 error = 557 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 558 if (error == ENOENT) 559 gotchildmax = 0; 560 else if (error != 0) 561 goto done_free; 562 else 563 gotchildmax = 1; 564 565 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 566 if (error == ENOENT) 567 gotenforce = 0; 568 else if (error != 0) 569 goto done_free; 570 else if (enforce < 0 || enforce > 2) { 571 error = EINVAL; 572 goto done_free; 573 } else 574 gotenforce = 1; 575 576 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 577 if (error == ENOENT) 578 gotrsnum = 0; 579 else if (error != 0) 580 goto done_free; 581 else 582 gotrsnum = 1; 583 584 pr_flags = ch_flags = 0; 585 for (bf = pr_flag_bool; 586 bf < pr_flag_bool + nitems(pr_flag_bool); 587 bf++) { 588 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag); 589 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag); 590 } 591 ch_flags |= pr_flags; 592 for (jsf = pr_flag_jailsys; 593 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 594 jsf++) { 595 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys)); 596 if (error == ENOENT) 597 continue; 598 if (error != 0) 599 goto done_free; 600 switch (jsys) { 601 case JAIL_SYS_DISABLE: 602 if (!jsf->disable) { 603 error = EINVAL; 604 goto done_free; 605 } 606 pr_flags |= jsf->disable; 607 break; 608 case JAIL_SYS_NEW: 609 pr_flags |= jsf->new; 610 break; 611 case JAIL_SYS_INHERIT: 612 break; 613 default: 614 error = EINVAL; 615 goto done_free; 616 } 617 ch_flags |= jsf->new | jsf->disable; 618 } 619 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 620 && !(pr_flags & PR_PERSIST)) { 621 error = EINVAL; 622 vfs_opterror(opts, "new jail must persist or attach"); 623 goto done_errmsg; 624 } 625 #ifdef VIMAGE 626 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 627 error = EINVAL; 628 vfs_opterror(opts, "vnet cannot be changed after creation"); 629 goto done_errmsg; 630 } 631 #endif 632 #ifdef INET 633 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 634 error = EINVAL; 635 vfs_opterror(opts, "ip4 cannot be changed after creation"); 636 goto done_errmsg; 637 } 638 #endif 639 #ifdef INET6 640 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 641 error = EINVAL; 642 vfs_opterror(opts, "ip6 cannot be changed after creation"); 643 goto done_errmsg; 644 } 645 #endif 646 647 pr_allow = ch_allow = 0; 648 for (bf = pr_flag_allow; 649 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 650 bf++) { 651 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag); 652 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag); 653 } 654 ch_allow |= pr_allow; 655 656 error = vfs_getopt(opts, "name", (void **)&name, &len); 657 if (error == ENOENT) 658 name = NULL; 659 else if (error != 0) 660 goto done_free; 661 else { 662 if (len == 0 || name[len - 1] != '\0') { 663 error = EINVAL; 664 goto done_free; 665 } 666 if (len > MAXHOSTNAMELEN) { 667 error = ENAMETOOLONG; 668 goto done_free; 669 } 670 } 671 672 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 673 if (error == ENOENT) 674 host = NULL; 675 else if (error != 0) 676 goto done_free; 677 else { 678 ch_flags |= PR_HOST; 679 pr_flags |= PR_HOST; 680 if (len == 0 || host[len - 1] != '\0') { 681 error = EINVAL; 682 goto done_free; 683 } 684 if (len > MAXHOSTNAMELEN) { 685 error = ENAMETOOLONG; 686 goto done_free; 687 } 688 } 689 690 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 691 if (error == ENOENT) 692 domain = NULL; 693 else if (error != 0) 694 goto done_free; 695 else { 696 ch_flags |= PR_HOST; 697 pr_flags |= PR_HOST; 698 if (len == 0 || domain[len - 1] != '\0') { 699 error = EINVAL; 700 goto done_free; 701 } 702 if (len > MAXHOSTNAMELEN) { 703 error = ENAMETOOLONG; 704 goto done_free; 705 } 706 } 707 708 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 709 if (error == ENOENT) 710 uuid = NULL; 711 else if (error != 0) 712 goto done_free; 713 else { 714 ch_flags |= PR_HOST; 715 pr_flags |= PR_HOST; 716 if (len == 0 || uuid[len - 1] != '\0') { 717 error = EINVAL; 718 goto done_free; 719 } 720 if (len > HOSTUUIDLEN) { 721 error = ENAMETOOLONG; 722 goto done_free; 723 } 724 } 725 726 #ifdef COMPAT_FREEBSD32 727 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 728 uint32_t hid32; 729 730 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 731 hid = hid32; 732 } else 733 #endif 734 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 735 if (error == ENOENT) 736 gothid = 0; 737 else if (error != 0) 738 goto done_free; 739 else { 740 gothid = 1; 741 ch_flags |= PR_HOST; 742 pr_flags |= PR_HOST; 743 } 744 745 #ifdef INET 746 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 747 if (error == ENOENT) 748 ip4s = 0; 749 else if (error != 0) 750 goto done_free; 751 else if (ip4s & (sizeof(*ip4) - 1)) { 752 error = EINVAL; 753 goto done_free; 754 } else { 755 ch_flags |= PR_IP4_USER; 756 pr_flags |= PR_IP4_USER; 757 if (ip4s > 0) { 758 ip4s /= sizeof(*ip4); 759 if (ip4s > jail_max_af_ips) { 760 error = EINVAL; 761 vfs_opterror(opts, "too many IPv4 addresses"); 762 goto done_errmsg; 763 } 764 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 765 bcopy(op, ip4, ip4s * sizeof(*ip4)); 766 /* 767 * IP addresses are all sorted but ip[0] to preserve 768 * the primary IP address as given from userland. 769 * This special IP is used for unbound outgoing 770 * connections as well for "loopback" traffic in case 771 * source address selection cannot find any more fitting 772 * address to connect from. 773 */ 774 if (ip4s > 1) 775 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), 776 prison_qcmp_v4); 777 /* 778 * Check for duplicate addresses and do some simple 779 * zero and broadcast checks. If users give other bogus 780 * addresses it is their problem. 781 * 782 * We do not have to care about byte order for these 783 * checks so we will do them in NBO. 784 */ 785 for (ii = 0; ii < ip4s; ii++) { 786 if (ip4[ii].s_addr == INADDR_ANY || 787 ip4[ii].s_addr == INADDR_BROADCAST) { 788 error = EINVAL; 789 goto done_free; 790 } 791 if ((ii+1) < ip4s && 792 (ip4[0].s_addr == ip4[ii+1].s_addr || 793 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 794 error = EINVAL; 795 goto done_free; 796 } 797 } 798 } 799 } 800 #endif 801 802 #ifdef INET6 803 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 804 if (error == ENOENT) 805 ip6s = 0; 806 else if (error != 0) 807 goto done_free; 808 else if (ip6s & (sizeof(*ip6) - 1)) { 809 error = EINVAL; 810 goto done_free; 811 } else { 812 ch_flags |= PR_IP6_USER; 813 pr_flags |= PR_IP6_USER; 814 if (ip6s > 0) { 815 ip6s /= sizeof(*ip6); 816 if (ip6s > jail_max_af_ips) { 817 error = EINVAL; 818 vfs_opterror(opts, "too many IPv6 addresses"); 819 goto done_errmsg; 820 } 821 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 822 bcopy(op, ip6, ip6s * sizeof(*ip6)); 823 if (ip6s > 1) 824 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), 825 prison_qcmp_v6); 826 for (ii = 0; ii < ip6s; ii++) { 827 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 828 error = EINVAL; 829 goto done_free; 830 } 831 if ((ii+1) < ip6s && 832 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 833 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 834 { 835 error = EINVAL; 836 goto done_free; 837 } 838 } 839 } 840 } 841 #endif 842 843 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 844 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 845 error = EINVAL; 846 vfs_opterror(opts, 847 "vnet jails cannot have IP address restrictions"); 848 goto done_errmsg; 849 } 850 #endif 851 852 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 853 if (error == ENOENT) 854 osrelstr = NULL; 855 else if (error != 0) 856 goto done_free; 857 else { 858 if (flags & JAIL_UPDATE) { 859 error = EINVAL; 860 vfs_opterror(opts, 861 "osrelease cannot be changed after creation"); 862 goto done_errmsg; 863 } 864 if (len == 0 || len >= OSRELEASELEN) { 865 error = EINVAL; 866 vfs_opterror(opts, 867 "osrelease string must be 1-%d bytes long", 868 OSRELEASELEN - 1); 869 goto done_errmsg; 870 } 871 } 872 873 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 874 if (error == ENOENT) 875 osreldt = 0; 876 else if (error != 0) 877 goto done_free; 878 else { 879 if (flags & JAIL_UPDATE) { 880 error = EINVAL; 881 vfs_opterror(opts, 882 "osreldate cannot be changed after creation"); 883 goto done_errmsg; 884 } 885 if (osreldt == 0) { 886 error = EINVAL; 887 vfs_opterror(opts, "osreldate cannot be 0"); 888 goto done_errmsg; 889 } 890 } 891 892 fullpath_disabled = 0; 893 root = NULL; 894 error = vfs_getopt(opts, "path", (void **)&path, &len); 895 if (error == ENOENT) 896 path = NULL; 897 else if (error != 0) 898 goto done_free; 899 else { 900 if (flags & JAIL_UPDATE) { 901 error = EINVAL; 902 vfs_opterror(opts, 903 "path cannot be changed after creation"); 904 goto done_errmsg; 905 } 906 if (len == 0 || path[len - 1] != '\0') { 907 error = EINVAL; 908 goto done_free; 909 } 910 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 911 path, td); 912 error = namei(&nd); 913 if (error) 914 goto done_free; 915 root = nd.ni_vp; 916 NDFREE(&nd, NDF_ONLY_PNBUF); 917 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 918 strlcpy(g_path, path, MAXPATHLEN); 919 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 920 if (error == 0) 921 path = g_path; 922 else if (error == ENODEV) { 923 /* proceed if sysctl debug.disablefullpath == 1 */ 924 fullpath_disabled = 1; 925 if (len < 2 || (len == 2 && path[0] == '/')) 926 path = NULL; 927 } else { 928 /* exit on other errors */ 929 goto done_free; 930 } 931 if (root->v_type != VDIR) { 932 error = ENOTDIR; 933 vput(root); 934 goto done_free; 935 } 936 VOP_UNLOCK(root, 0); 937 if (fullpath_disabled) { 938 /* Leave room for a real-root full pathname. */ 939 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 940 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 941 error = ENAMETOOLONG; 942 vrele(root); 943 goto done_free; 944 } 945 } 946 } 947 948 /* 949 * Find the specified jail, or at least its parent. 950 * This abuses the file error codes ENOENT and EEXIST. 951 */ 952 pr = NULL; 953 ppr = mypr; 954 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 955 namelc = strrchr(name, '.'); 956 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 957 if (*p != '\0') 958 jid = 0; 959 } 960 sx_xlock(&allprison_lock); 961 if (jid != 0) { 962 /* 963 * See if a requested jid already exists. There is an 964 * information leak here if the jid exists but is not within 965 * the caller's jail hierarchy. Jail creators will get EEXIST 966 * even though they cannot see the jail, and CREATE | UPDATE 967 * will return ENOENT which is not normally a valid error. 968 */ 969 if (jid < 0) { 970 error = EINVAL; 971 vfs_opterror(opts, "negative jid"); 972 goto done_unlock_list; 973 } 974 pr = prison_find(jid); 975 if (pr != NULL) { 976 ppr = pr->pr_parent; 977 /* Create: jid must not exist. */ 978 if (cuflags == JAIL_CREATE) { 979 mtx_unlock(&pr->pr_mtx); 980 error = EEXIST; 981 vfs_opterror(opts, "jail %d already exists", 982 jid); 983 goto done_unlock_list; 984 } 985 if (!prison_ischild(mypr, pr)) { 986 mtx_unlock(&pr->pr_mtx); 987 pr = NULL; 988 } else if (pr->pr_uref == 0) { 989 if (!(flags & JAIL_DYING)) { 990 mtx_unlock(&pr->pr_mtx); 991 error = ENOENT; 992 vfs_opterror(opts, "jail %d is dying", 993 jid); 994 goto done_unlock_list; 995 } else if ((flags & JAIL_ATTACH) || 996 (pr_flags & PR_PERSIST)) { 997 /* 998 * A dying jail might be resurrected 999 * (via attach or persist), but first 1000 * it must determine if another jail 1001 * has claimed its name. Accomplish 1002 * this by implicitly re-setting the 1003 * name. 1004 */ 1005 if (name == NULL) 1006 name = prison_name(mypr, pr); 1007 } 1008 } 1009 } 1010 if (pr == NULL) { 1011 /* Update: jid must exist. */ 1012 if (cuflags == JAIL_UPDATE) { 1013 error = ENOENT; 1014 vfs_opterror(opts, "jail %d not found", jid); 1015 goto done_unlock_list; 1016 } 1017 } 1018 } 1019 /* 1020 * If the caller provided a name, look for a jail by that name. 1021 * This has different semantics for creates and updates keyed by jid 1022 * (where the name must not already exist in a different jail), 1023 * and updates keyed by the name itself (where the name must exist 1024 * because that is the jail being updated). 1025 */ 1026 namelc = NULL; 1027 if (name != NULL) { 1028 namelc = strrchr(name, '.'); 1029 if (namelc == NULL) 1030 namelc = name; 1031 else { 1032 /* 1033 * This is a hierarchical name. Split it into the 1034 * parent and child names, and make sure the parent 1035 * exists or matches an already found jail. 1036 */ 1037 if (pr != NULL) { 1038 if (strncmp(name, ppr->pr_name, namelc - name) 1039 || ppr->pr_name[namelc - name] != '\0') { 1040 mtx_unlock(&pr->pr_mtx); 1041 error = EINVAL; 1042 vfs_opterror(opts, 1043 "cannot change jail's parent"); 1044 goto done_unlock_list; 1045 } 1046 } else { 1047 *namelc = '\0'; 1048 ppr = prison_find_name(mypr, name); 1049 if (ppr == NULL) { 1050 error = ENOENT; 1051 vfs_opterror(opts, 1052 "jail \"%s\" not found", name); 1053 goto done_unlock_list; 1054 } 1055 mtx_unlock(&ppr->pr_mtx); 1056 *namelc = '.'; 1057 } 1058 namelc++; 1059 } 1060 if (namelc[0] != '\0') { 1061 pnamelen = 1062 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1063 name_again: 1064 deadpr = NULL; 1065 FOREACH_PRISON_CHILD(ppr, tpr) { 1066 if (tpr != pr && tpr->pr_ref > 0 && 1067 !strcmp(tpr->pr_name + pnamelen, namelc)) { 1068 if (pr == NULL && 1069 cuflags != JAIL_CREATE) { 1070 mtx_lock(&tpr->pr_mtx); 1071 if (tpr->pr_ref > 0) { 1072 /* 1073 * Use this jail 1074 * for updates. 1075 */ 1076 if (tpr->pr_uref > 0) { 1077 pr = tpr; 1078 break; 1079 } 1080 deadpr = tpr; 1081 } 1082 mtx_unlock(&tpr->pr_mtx); 1083 } else if (tpr->pr_uref > 0) { 1084 /* 1085 * Create, or update(jid): 1086 * name must not exist in an 1087 * active sibling jail. 1088 */ 1089 error = EEXIST; 1090 if (pr != NULL) 1091 mtx_unlock(&pr->pr_mtx); 1092 vfs_opterror(opts, 1093 "jail \"%s\" already exists", 1094 name); 1095 goto done_unlock_list; 1096 } 1097 } 1098 } 1099 /* If no active jail is found, use a dying one. */ 1100 if (deadpr != NULL && pr == NULL) { 1101 if (flags & JAIL_DYING) { 1102 mtx_lock(&deadpr->pr_mtx); 1103 if (deadpr->pr_ref == 0) { 1104 mtx_unlock(&deadpr->pr_mtx); 1105 goto name_again; 1106 } 1107 pr = deadpr; 1108 } else if (cuflags == JAIL_UPDATE) { 1109 error = ENOENT; 1110 vfs_opterror(opts, 1111 "jail \"%s\" is dying", name); 1112 goto done_unlock_list; 1113 } 1114 } 1115 /* Update: name must exist if no jid. */ 1116 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1117 error = ENOENT; 1118 vfs_opterror(opts, "jail \"%s\" not found", 1119 name); 1120 goto done_unlock_list; 1121 } 1122 } 1123 } 1124 /* Update: must provide a jid or name. */ 1125 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1126 error = ENOENT; 1127 vfs_opterror(opts, "update specified no jail"); 1128 goto done_unlock_list; 1129 } 1130 1131 /* If there's no prison to update, create a new one and link it in. */ 1132 if (pr == NULL) { 1133 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1134 if (tpr->pr_childcount >= tpr->pr_childmax) { 1135 error = EPERM; 1136 vfs_opterror(opts, "prison limit exceeded"); 1137 goto done_unlock_list; 1138 } 1139 created = 1; 1140 mtx_lock(&ppr->pr_mtx); 1141 if (ppr->pr_ref == 0) { 1142 mtx_unlock(&ppr->pr_mtx); 1143 error = ENOENT; 1144 vfs_opterror(opts, "jail \"%s\" not found", 1145 prison_name(mypr, ppr)); 1146 goto done_unlock_list; 1147 } 1148 ppr->pr_ref++; 1149 ppr->pr_uref++; 1150 mtx_unlock(&ppr->pr_mtx); 1151 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1152 if (jid == 0) { 1153 /* Find the next free jid. */ 1154 jid = lastprid + 1; 1155 findnext: 1156 if (jid == JAIL_MAX) 1157 jid = 1; 1158 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1159 if (tpr->pr_id < jid) 1160 continue; 1161 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1162 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1163 break; 1164 } 1165 if (jid == lastprid) { 1166 error = EAGAIN; 1167 vfs_opterror(opts, 1168 "no available jail IDs"); 1169 free(pr, M_PRISON); 1170 prison_deref(ppr, PD_DEREF | 1171 PD_DEUREF | PD_LIST_XLOCKED); 1172 goto done_releroot; 1173 } 1174 jid++; 1175 goto findnext; 1176 } 1177 lastprid = jid; 1178 } else { 1179 /* 1180 * The jail already has a jid (that did not yet exist), 1181 * so just find where to insert it. 1182 */ 1183 TAILQ_FOREACH(tpr, &allprison, pr_list) 1184 if (tpr->pr_id >= jid) { 1185 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1186 break; 1187 } 1188 } 1189 if (tpr == NULL) 1190 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1191 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1192 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1193 tpr->pr_childcount++; 1194 1195 pr->pr_parent = ppr; 1196 pr->pr_id = jid; 1197 1198 /* Set some default values, and inherit some from the parent. */ 1199 if (namelc == NULL) 1200 namelc = ""; 1201 if (path == NULL) { 1202 path = "/"; 1203 root = mypr->pr_root; 1204 vref(root); 1205 } 1206 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1207 pr->pr_flags |= PR_HOST; 1208 #if defined(INET) || defined(INET6) 1209 #ifdef VIMAGE 1210 if (!(pr_flags & PR_VNET)) 1211 #endif 1212 { 1213 #ifdef INET 1214 if (!(ch_flags & PR_IP4_USER)) 1215 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1216 else if (!(pr_flags & PR_IP4_USER)) { 1217 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1218 if (ppr->pr_ip4 != NULL) { 1219 pr->pr_ip4s = ppr->pr_ip4s; 1220 pr->pr_ip4 = malloc(pr->pr_ip4s * 1221 sizeof(struct in_addr), M_PRISON, 1222 M_WAITOK); 1223 bcopy(ppr->pr_ip4, pr->pr_ip4, 1224 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1225 } 1226 } 1227 #endif 1228 #ifdef INET6 1229 if (!(ch_flags & PR_IP6_USER)) 1230 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1231 else if (!(pr_flags & PR_IP6_USER)) { 1232 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1233 if (ppr->pr_ip6 != NULL) { 1234 pr->pr_ip6s = ppr->pr_ip6s; 1235 pr->pr_ip6 = malloc(pr->pr_ip6s * 1236 sizeof(struct in6_addr), M_PRISON, 1237 M_WAITOK); 1238 bcopy(ppr->pr_ip6, pr->pr_ip6, 1239 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1240 } 1241 } 1242 #endif 1243 } 1244 #endif 1245 /* Source address selection is always on by default. */ 1246 pr->pr_flags |= _PR_IP_SADDRSEL; 1247 1248 pr->pr_securelevel = ppr->pr_securelevel; 1249 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1250 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1251 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1252 1253 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1254 if (osrelstr == NULL) 1255 strcpy(pr->pr_osrelease, ppr->pr_osrelease); 1256 else 1257 strcpy(pr->pr_osrelease, osrelstr); 1258 1259 LIST_INIT(&pr->pr_children); 1260 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1261 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1262 1263 #ifdef VIMAGE 1264 /* Allocate a new vnet if specified. */ 1265 pr->pr_vnet = (pr_flags & PR_VNET) 1266 ? vnet_alloc() : ppr->pr_vnet; 1267 #endif 1268 /* 1269 * Allocate a dedicated cpuset for each jail. 1270 * Unlike other initial settings, this may return an erorr. 1271 */ 1272 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1273 if (error) { 1274 prison_deref(pr, PD_LIST_XLOCKED); 1275 goto done_releroot; 1276 } 1277 1278 mtx_lock(&pr->pr_mtx); 1279 /* 1280 * New prisons do not yet have a reference, because we do not 1281 * want others to see the incomplete prison once the 1282 * allprison_lock is downgraded. 1283 */ 1284 } else { 1285 created = 0; 1286 /* 1287 * Grab a reference for existing prisons, to ensure they 1288 * continue to exist for the duration of the call. 1289 */ 1290 pr->pr_ref++; 1291 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1292 if ((pr->pr_flags & PR_VNET) && 1293 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1294 error = EINVAL; 1295 vfs_opterror(opts, 1296 "vnet jails cannot have IP address restrictions"); 1297 goto done_deref_locked; 1298 } 1299 #endif 1300 #ifdef INET 1301 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1302 error = EINVAL; 1303 vfs_opterror(opts, 1304 "ip4 cannot be changed after creation"); 1305 goto done_deref_locked; 1306 } 1307 #endif 1308 #ifdef INET6 1309 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1310 error = EINVAL; 1311 vfs_opterror(opts, 1312 "ip6 cannot be changed after creation"); 1313 goto done_deref_locked; 1314 } 1315 #endif 1316 } 1317 1318 /* Do final error checking before setting anything. */ 1319 if (gotslevel) { 1320 if (slevel < ppr->pr_securelevel) { 1321 error = EPERM; 1322 goto done_deref_locked; 1323 } 1324 } 1325 if (gotchildmax) { 1326 if (childmax >= ppr->pr_childmax) { 1327 error = EPERM; 1328 goto done_deref_locked; 1329 } 1330 } 1331 if (gotenforce) { 1332 if (enforce < ppr->pr_enforce_statfs) { 1333 error = EPERM; 1334 goto done_deref_locked; 1335 } 1336 } 1337 if (gotrsnum) { 1338 /* 1339 * devfs_rsnum is a uint16_t 1340 */ 1341 if (rsnum < 0 || rsnum > 65535) { 1342 error = EINVAL; 1343 goto done_deref_locked; 1344 } 1345 /* 1346 * Nested jails always inherit parent's devfs ruleset 1347 */ 1348 if (jailed(td->td_ucred)) { 1349 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1350 error = EPERM; 1351 goto done_deref_locked; 1352 } else 1353 rsnum = ppr->pr_devfs_rsnum; 1354 } 1355 } 1356 #ifdef INET 1357 if (ip4s > 0) { 1358 if (ppr->pr_flags & PR_IP4) { 1359 /* 1360 * Make sure the new set of IP addresses is a 1361 * subset of the parent's list. Don't worry 1362 * about the parent being unlocked, as any 1363 * setting is done with allprison_lock held. 1364 */ 1365 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1366 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1367 break; 1368 if (ij == ppr->pr_ip4s) { 1369 error = EPERM; 1370 goto done_deref_locked; 1371 } 1372 if (ip4s > 1) { 1373 for (ii = ij = 1; ii < ip4s; ii++) { 1374 if (ip4[ii].s_addr == 1375 ppr->pr_ip4[0].s_addr) 1376 continue; 1377 for (; ij < ppr->pr_ip4s; ij++) 1378 if (ip4[ii].s_addr == 1379 ppr->pr_ip4[ij].s_addr) 1380 break; 1381 if (ij == ppr->pr_ip4s) 1382 break; 1383 } 1384 if (ij == ppr->pr_ip4s) { 1385 error = EPERM; 1386 goto done_deref_locked; 1387 } 1388 } 1389 } 1390 /* 1391 * Check for conflicting IP addresses. We permit them 1392 * if there is no more than one IP on each jail. If 1393 * there is a duplicate on a jail with more than one 1394 * IP stop checking and return error. 1395 */ 1396 tppr = ppr; 1397 #ifdef VIMAGE 1398 for (; tppr != &prison0; tppr = tppr->pr_parent) 1399 if (tppr->pr_flags & PR_VNET) 1400 break; 1401 #endif 1402 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1403 if (tpr == pr || 1404 #ifdef VIMAGE 1405 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1406 #endif 1407 tpr->pr_uref == 0) { 1408 descend = 0; 1409 continue; 1410 } 1411 if (!(tpr->pr_flags & PR_IP4_USER)) 1412 continue; 1413 descend = 0; 1414 if (tpr->pr_ip4 == NULL || 1415 (ip4s == 1 && tpr->pr_ip4s == 1)) 1416 continue; 1417 for (ii = 0; ii < ip4s; ii++) { 1418 if (prison_check_ip4_locked(tpr, &ip4[ii]) == 1419 0) { 1420 error = EADDRINUSE; 1421 vfs_opterror(opts, 1422 "IPv4 addresses clash"); 1423 goto done_deref_locked; 1424 } 1425 } 1426 } 1427 } 1428 #endif 1429 #ifdef INET6 1430 if (ip6s > 0) { 1431 if (ppr->pr_flags & PR_IP6) { 1432 /* 1433 * Make sure the new set of IP addresses is a 1434 * subset of the parent's list. 1435 */ 1436 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1437 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1438 &ppr->pr_ip6[ij])) 1439 break; 1440 if (ij == ppr->pr_ip6s) { 1441 error = EPERM; 1442 goto done_deref_locked; 1443 } 1444 if (ip6s > 1) { 1445 for (ii = ij = 1; ii < ip6s; ii++) { 1446 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1447 &ppr->pr_ip6[0])) 1448 continue; 1449 for (; ij < ppr->pr_ip6s; ij++) 1450 if (IN6_ARE_ADDR_EQUAL( 1451 &ip6[ii], &ppr->pr_ip6[ij])) 1452 break; 1453 if (ij == ppr->pr_ip6s) 1454 break; 1455 } 1456 if (ij == ppr->pr_ip6s) { 1457 error = EPERM; 1458 goto done_deref_locked; 1459 } 1460 } 1461 } 1462 /* Check for conflicting IP addresses. */ 1463 tppr = ppr; 1464 #ifdef VIMAGE 1465 for (; tppr != &prison0; tppr = tppr->pr_parent) 1466 if (tppr->pr_flags & PR_VNET) 1467 break; 1468 #endif 1469 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1470 if (tpr == pr || 1471 #ifdef VIMAGE 1472 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1473 #endif 1474 tpr->pr_uref == 0) { 1475 descend = 0; 1476 continue; 1477 } 1478 if (!(tpr->pr_flags & PR_IP6_USER)) 1479 continue; 1480 descend = 0; 1481 if (tpr->pr_ip6 == NULL || 1482 (ip6s == 1 && tpr->pr_ip6s == 1)) 1483 continue; 1484 for (ii = 0; ii < ip6s; ii++) { 1485 if (prison_check_ip6_locked(tpr, &ip6[ii]) == 1486 0) { 1487 error = EADDRINUSE; 1488 vfs_opterror(opts, 1489 "IPv6 addresses clash"); 1490 goto done_deref_locked; 1491 } 1492 } 1493 } 1494 } 1495 #endif 1496 onamelen = namelen = 0; 1497 if (namelc != NULL) { 1498 /* Give a default name of the jid. Also allow the name to be 1499 * explicitly the jid - but not any other number, and only in 1500 * normal form (no leading zero/etc). 1501 */ 1502 if (namelc[0] == '\0') 1503 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1504 else if ((strtoul(namelc, &p, 10) != jid || 1505 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1506 error = EINVAL; 1507 vfs_opterror(opts, 1508 "name cannot be numeric (unless it is the jid)"); 1509 goto done_deref_locked; 1510 } 1511 /* 1512 * Make sure the name isn't too long for the prison or its 1513 * children. 1514 */ 1515 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1516 onamelen = strlen(pr->pr_name + pnamelen); 1517 namelen = strlen(namelc); 1518 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1519 error = ENAMETOOLONG; 1520 goto done_deref_locked; 1521 } 1522 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1523 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1524 sizeof(pr->pr_name)) { 1525 error = ENAMETOOLONG; 1526 goto done_deref_locked; 1527 } 1528 } 1529 } 1530 if (pr_allow & ~ppr->pr_allow) { 1531 error = EPERM; 1532 goto done_deref_locked; 1533 } 1534 1535 /* 1536 * Let modules check their parameters. This requires unlocking and 1537 * then re-locking the prison, but this is still a valid state as long 1538 * as allprison_lock remains xlocked. 1539 */ 1540 mtx_unlock(&pr->pr_mtx); 1541 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1542 if (error != 0) { 1543 prison_deref(pr, created 1544 ? PD_LIST_XLOCKED 1545 : PD_DEREF | PD_LIST_XLOCKED); 1546 goto done_releroot; 1547 } 1548 mtx_lock(&pr->pr_mtx); 1549 1550 /* At this point, all valid parameters should have been noted. */ 1551 TAILQ_FOREACH(opt, opts, link) { 1552 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1553 error = EINVAL; 1554 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1555 goto done_deref_locked; 1556 } 1557 } 1558 1559 /* Set the parameters of the prison. */ 1560 #ifdef INET 1561 redo_ip4 = 0; 1562 if (pr_flags & PR_IP4_USER) { 1563 pr->pr_flags |= PR_IP4; 1564 free(pr->pr_ip4, M_PRISON); 1565 pr->pr_ip4s = ip4s; 1566 pr->pr_ip4 = ip4; 1567 ip4 = NULL; 1568 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1569 #ifdef VIMAGE 1570 if (tpr->pr_flags & PR_VNET) { 1571 descend = 0; 1572 continue; 1573 } 1574 #endif 1575 if (prison_restrict_ip4(tpr, NULL)) { 1576 redo_ip4 = 1; 1577 descend = 0; 1578 } 1579 } 1580 } 1581 #endif 1582 #ifdef INET6 1583 redo_ip6 = 0; 1584 if (pr_flags & PR_IP6_USER) { 1585 pr->pr_flags |= PR_IP6; 1586 free(pr->pr_ip6, M_PRISON); 1587 pr->pr_ip6s = ip6s; 1588 pr->pr_ip6 = ip6; 1589 ip6 = NULL; 1590 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1591 #ifdef VIMAGE 1592 if (tpr->pr_flags & PR_VNET) { 1593 descend = 0; 1594 continue; 1595 } 1596 #endif 1597 if (prison_restrict_ip6(tpr, NULL)) { 1598 redo_ip6 = 1; 1599 descend = 0; 1600 } 1601 } 1602 } 1603 #endif 1604 if (gotslevel) { 1605 pr->pr_securelevel = slevel; 1606 /* Set all child jails to be at least this level. */ 1607 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1608 if (tpr->pr_securelevel < slevel) 1609 tpr->pr_securelevel = slevel; 1610 } 1611 if (gotchildmax) { 1612 pr->pr_childmax = childmax; 1613 /* Set all child jails to under this limit. */ 1614 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1615 if (tpr->pr_childmax > childmax - level) 1616 tpr->pr_childmax = childmax > level 1617 ? childmax - level : 0; 1618 } 1619 if (gotenforce) { 1620 pr->pr_enforce_statfs = enforce; 1621 /* Pass this restriction on to the children. */ 1622 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1623 if (tpr->pr_enforce_statfs < enforce) 1624 tpr->pr_enforce_statfs = enforce; 1625 } 1626 if (gotrsnum) { 1627 pr->pr_devfs_rsnum = rsnum; 1628 /* Pass this restriction on to the children. */ 1629 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1630 tpr->pr_devfs_rsnum = rsnum; 1631 } 1632 if (namelc != NULL) { 1633 if (ppr == &prison0) 1634 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1635 else 1636 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1637 ppr->pr_name, namelc); 1638 /* Change this component of child names. */ 1639 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1640 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1641 strlen(tpr->pr_name + onamelen) + 1); 1642 bcopy(pr->pr_name, tpr->pr_name, namelen); 1643 } 1644 } 1645 if (path != NULL) { 1646 /* Try to keep a real-rooted full pathname. */ 1647 if (fullpath_disabled && path[0] == '/' && 1648 strcmp(mypr->pr_path, "/")) 1649 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1650 mypr->pr_path, path); 1651 else 1652 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1653 pr->pr_root = root; 1654 } 1655 if (PR_HOST & ch_flags & ~pr_flags) { 1656 if (pr->pr_flags & PR_HOST) { 1657 /* 1658 * Copy the parent's host info. As with pr_ip4 above, 1659 * the lack of a lock on the parent is not a problem; 1660 * it is always set with allprison_lock at least 1661 * shared, and is held exclusively here. 1662 */ 1663 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1664 sizeof(pr->pr_hostname)); 1665 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1666 sizeof(pr->pr_domainname)); 1667 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1668 sizeof(pr->pr_hostuuid)); 1669 pr->pr_hostid = pr->pr_parent->pr_hostid; 1670 } 1671 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1672 /* Set this prison, and any descendants without PR_HOST. */ 1673 if (host != NULL) 1674 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1675 if (domain != NULL) 1676 strlcpy(pr->pr_domainname, domain, 1677 sizeof(pr->pr_domainname)); 1678 if (uuid != NULL) 1679 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1680 if (gothid) 1681 pr->pr_hostid = hid; 1682 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1683 if (tpr->pr_flags & PR_HOST) 1684 descend = 0; 1685 else { 1686 if (host != NULL) 1687 strlcpy(tpr->pr_hostname, 1688 pr->pr_hostname, 1689 sizeof(tpr->pr_hostname)); 1690 if (domain != NULL) 1691 strlcpy(tpr->pr_domainname, 1692 pr->pr_domainname, 1693 sizeof(tpr->pr_domainname)); 1694 if (uuid != NULL) 1695 strlcpy(tpr->pr_hostuuid, 1696 pr->pr_hostuuid, 1697 sizeof(tpr->pr_hostuuid)); 1698 if (gothid) 1699 tpr->pr_hostid = hid; 1700 } 1701 } 1702 } 1703 if ((tallow = ch_allow & ~pr_allow)) { 1704 /* Clear allow bits in all children. */ 1705 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1706 tpr->pr_allow &= ~tallow; 1707 } 1708 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1709 /* 1710 * Persistent prisons get an extra reference, and prisons losing their 1711 * persist flag lose that reference. Only do this for existing prisons 1712 * for now, so new ones will remain unseen until after the module 1713 * handlers have completed. 1714 */ 1715 born = pr->pr_uref == 0; 1716 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1717 if (pr_flags & PR_PERSIST) { 1718 pr->pr_ref++; 1719 pr->pr_uref++; 1720 } else { 1721 pr->pr_ref--; 1722 pr->pr_uref--; 1723 } 1724 } 1725 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1726 mtx_unlock(&pr->pr_mtx); 1727 1728 #ifdef RACCT 1729 if (racct_enable && created) 1730 prison_racct_attach(pr); 1731 #endif 1732 1733 /* Locks may have prevented a complete restriction of child IP 1734 * addresses. If so, allocate some more memory and try again. 1735 */ 1736 #ifdef INET 1737 while (redo_ip4) { 1738 ip4s = pr->pr_ip4s; 1739 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1740 mtx_lock(&pr->pr_mtx); 1741 redo_ip4 = 0; 1742 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1743 #ifdef VIMAGE 1744 if (tpr->pr_flags & PR_VNET) { 1745 descend = 0; 1746 continue; 1747 } 1748 #endif 1749 if (prison_restrict_ip4(tpr, ip4)) { 1750 if (ip4 != NULL) 1751 ip4 = NULL; 1752 else 1753 redo_ip4 = 1; 1754 } 1755 } 1756 mtx_unlock(&pr->pr_mtx); 1757 } 1758 #endif 1759 #ifdef INET6 1760 while (redo_ip6) { 1761 ip6s = pr->pr_ip6s; 1762 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1763 mtx_lock(&pr->pr_mtx); 1764 redo_ip6 = 0; 1765 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1766 #ifdef VIMAGE 1767 if (tpr->pr_flags & PR_VNET) { 1768 descend = 0; 1769 continue; 1770 } 1771 #endif 1772 if (prison_restrict_ip6(tpr, ip6)) { 1773 if (ip6 != NULL) 1774 ip6 = NULL; 1775 else 1776 redo_ip6 = 1; 1777 } 1778 } 1779 mtx_unlock(&pr->pr_mtx); 1780 } 1781 #endif 1782 1783 /* Let the modules do their work. */ 1784 sx_downgrade(&allprison_lock); 1785 if (born) { 1786 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1787 if (error) { 1788 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1789 prison_deref(pr, created 1790 ? PD_LIST_SLOCKED 1791 : PD_DEREF | PD_LIST_SLOCKED); 1792 goto done_errmsg; 1793 } 1794 } 1795 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1796 if (error) { 1797 if (born) 1798 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1799 prison_deref(pr, created 1800 ? PD_LIST_SLOCKED 1801 : PD_DEREF | PD_LIST_SLOCKED); 1802 goto done_errmsg; 1803 } 1804 1805 /* Attach this process to the prison if requested. */ 1806 if (flags & JAIL_ATTACH) { 1807 mtx_lock(&pr->pr_mtx); 1808 error = do_jail_attach(td, pr); 1809 if (error) { 1810 vfs_opterror(opts, "attach failed"); 1811 if (!created) 1812 prison_deref(pr, PD_DEREF); 1813 goto done_errmsg; 1814 } 1815 } 1816 1817 #ifdef RACCT 1818 if (racct_enable && !created) { 1819 if (!(flags & JAIL_ATTACH)) 1820 sx_sunlock(&allprison_lock); 1821 prison_racct_modify(pr); 1822 if (!(flags & JAIL_ATTACH)) 1823 sx_slock(&allprison_lock); 1824 } 1825 #endif 1826 1827 td->td_retval[0] = pr->pr_id; 1828 1829 /* 1830 * Now that it is all there, drop the temporary reference from existing 1831 * prisons. Or add a reference to newly created persistent prisons 1832 * (which was not done earlier so that the prison would not be publicly 1833 * visible). 1834 */ 1835 if (!created) { 1836 prison_deref(pr, (flags & JAIL_ATTACH) 1837 ? PD_DEREF 1838 : PD_DEREF | PD_LIST_SLOCKED); 1839 } else { 1840 if (pr_flags & PR_PERSIST) { 1841 mtx_lock(&pr->pr_mtx); 1842 pr->pr_ref++; 1843 pr->pr_uref++; 1844 mtx_unlock(&pr->pr_mtx); 1845 } 1846 if (!(flags & JAIL_ATTACH)) 1847 sx_sunlock(&allprison_lock); 1848 } 1849 1850 goto done_free; 1851 1852 done_deref_locked: 1853 prison_deref(pr, created 1854 ? PD_LOCKED | PD_LIST_XLOCKED 1855 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1856 goto done_releroot; 1857 done_unlock_list: 1858 sx_xunlock(&allprison_lock); 1859 done_releroot: 1860 if (root != NULL) 1861 vrele(root); 1862 done_errmsg: 1863 if (error) { 1864 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 1865 &errmsg_len) == 0 && errmsg_len > 0) { 1866 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1867 if (optuio->uio_segflg == UIO_SYSSPACE) 1868 bcopy(errmsg, 1869 optuio->uio_iov[errmsg_pos].iov_base, 1870 errmsg_len); 1871 else 1872 copyout(errmsg, 1873 optuio->uio_iov[errmsg_pos].iov_base, 1874 errmsg_len); 1875 } 1876 } 1877 done_free: 1878 #ifdef INET 1879 free(ip4, M_PRISON); 1880 #endif 1881 #ifdef INET6 1882 free(ip6, M_PRISON); 1883 #endif 1884 if (g_path != NULL) 1885 free(g_path, M_TEMP); 1886 vfs_freeopts(opts); 1887 return (error); 1888 } 1889 1890 1891 /* 1892 * struct jail_get_args { 1893 * struct iovec *iovp; 1894 * unsigned int iovcnt; 1895 * int flags; 1896 * }; 1897 */ 1898 int 1899 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1900 { 1901 struct uio *auio; 1902 int error; 1903 1904 /* Check that we have an even number of iovecs. */ 1905 if (uap->iovcnt & 1) 1906 return (EINVAL); 1907 1908 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1909 if (error) 1910 return (error); 1911 error = kern_jail_get(td, auio, uap->flags); 1912 if (error == 0) 1913 error = copyout(auio->uio_iov, uap->iovp, 1914 uap->iovcnt * sizeof (struct iovec)); 1915 free(auio, M_IOV); 1916 return (error); 1917 } 1918 1919 int 1920 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1921 { 1922 struct bool_flags *bf; 1923 struct jailsys_flags *jsf; 1924 struct prison *pr, *mypr; 1925 struct vfsopt *opt; 1926 struct vfsoptlist *opts; 1927 char *errmsg, *name; 1928 int error, errmsg_len, errmsg_pos, i, jid, len, locked, pos; 1929 unsigned f; 1930 1931 if (flags & ~JAIL_GET_MASK) 1932 return (EINVAL); 1933 1934 /* Get the parameter list. */ 1935 error = vfs_buildopts(optuio, &opts); 1936 if (error) 1937 return (error); 1938 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1939 mypr = td->td_ucred->cr_prison; 1940 1941 /* 1942 * Find the prison specified by one of: lastjid, jid, name. 1943 */ 1944 sx_slock(&allprison_lock); 1945 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1946 if (error == 0) { 1947 TAILQ_FOREACH(pr, &allprison, pr_list) { 1948 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1949 mtx_lock(&pr->pr_mtx); 1950 if (pr->pr_ref > 0 && 1951 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1952 break; 1953 mtx_unlock(&pr->pr_mtx); 1954 } 1955 } 1956 if (pr != NULL) 1957 goto found_prison; 1958 error = ENOENT; 1959 vfs_opterror(opts, "no jail after %d", jid); 1960 goto done_unlock_list; 1961 } else if (error != ENOENT) 1962 goto done_unlock_list; 1963 1964 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1965 if (error == 0) { 1966 if (jid != 0) { 1967 pr = prison_find_child(mypr, jid); 1968 if (pr != NULL) { 1969 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1970 mtx_unlock(&pr->pr_mtx); 1971 error = ENOENT; 1972 vfs_opterror(opts, "jail %d is dying", 1973 jid); 1974 goto done_unlock_list; 1975 } 1976 goto found_prison; 1977 } 1978 error = ENOENT; 1979 vfs_opterror(opts, "jail %d not found", jid); 1980 goto done_unlock_list; 1981 } 1982 } else if (error != ENOENT) 1983 goto done_unlock_list; 1984 1985 error = vfs_getopt(opts, "name", (void **)&name, &len); 1986 if (error == 0) { 1987 if (len == 0 || name[len - 1] != '\0') { 1988 error = EINVAL; 1989 goto done_unlock_list; 1990 } 1991 pr = prison_find_name(mypr, name); 1992 if (pr != NULL) { 1993 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1994 mtx_unlock(&pr->pr_mtx); 1995 error = ENOENT; 1996 vfs_opterror(opts, "jail \"%s\" is dying", 1997 name); 1998 goto done_unlock_list; 1999 } 2000 goto found_prison; 2001 } 2002 error = ENOENT; 2003 vfs_opterror(opts, "jail \"%s\" not found", name); 2004 goto done_unlock_list; 2005 } else if (error != ENOENT) 2006 goto done_unlock_list; 2007 2008 vfs_opterror(opts, "no jail specified"); 2009 error = ENOENT; 2010 goto done_unlock_list; 2011 2012 found_prison: 2013 /* Get the parameters of the prison. */ 2014 pr->pr_ref++; 2015 locked = PD_LOCKED; 2016 td->td_retval[0] = pr->pr_id; 2017 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2018 if (error != 0 && error != ENOENT) 2019 goto done_deref; 2020 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2021 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2022 if (error != 0 && error != ENOENT) 2023 goto done_deref; 2024 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2025 if (error != 0 && error != ENOENT) 2026 goto done_deref; 2027 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2028 sizeof(pr->pr_cpuset->cs_id)); 2029 if (error != 0 && error != ENOENT) 2030 goto done_deref; 2031 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2032 if (error != 0 && error != ENOENT) 2033 goto done_deref; 2034 #ifdef INET 2035 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2036 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2037 if (error != 0 && error != ENOENT) 2038 goto done_deref; 2039 #endif 2040 #ifdef INET6 2041 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2042 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2043 if (error != 0 && error != ENOENT) 2044 goto done_deref; 2045 #endif 2046 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2047 sizeof(pr->pr_securelevel)); 2048 if (error != 0 && error != ENOENT) 2049 goto done_deref; 2050 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2051 sizeof(pr->pr_childcount)); 2052 if (error != 0 && error != ENOENT) 2053 goto done_deref; 2054 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2055 sizeof(pr->pr_childmax)); 2056 if (error != 0 && error != ENOENT) 2057 goto done_deref; 2058 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2059 if (error != 0 && error != ENOENT) 2060 goto done_deref; 2061 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2062 if (error != 0 && error != ENOENT) 2063 goto done_deref; 2064 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2065 if (error != 0 && error != ENOENT) 2066 goto done_deref; 2067 #ifdef COMPAT_FREEBSD32 2068 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2069 uint32_t hid32 = pr->pr_hostid; 2070 2071 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2072 } else 2073 #endif 2074 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2075 sizeof(pr->pr_hostid)); 2076 if (error != 0 && error != ENOENT) 2077 goto done_deref; 2078 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2079 sizeof(pr->pr_enforce_statfs)); 2080 if (error != 0 && error != ENOENT) 2081 goto done_deref; 2082 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2083 sizeof(pr->pr_devfs_rsnum)); 2084 if (error != 0 && error != ENOENT) 2085 goto done_deref; 2086 for (bf = pr_flag_bool; 2087 bf < pr_flag_bool + nitems(pr_flag_bool); 2088 bf++) { 2089 i = (pr->pr_flags & bf->flag) ? 1 : 0; 2090 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2091 if (error != 0 && error != ENOENT) 2092 goto done_deref; 2093 i = !i; 2094 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2095 if (error != 0 && error != ENOENT) 2096 goto done_deref; 2097 } 2098 for (jsf = pr_flag_jailsys; 2099 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 2100 jsf++) { 2101 f = pr->pr_flags & (jsf->disable | jsf->new); 2102 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE 2103 : (f == jsf->new) ? JAIL_SYS_NEW 2104 : JAIL_SYS_INHERIT; 2105 error = vfs_setopt(opts, jsf->name, &i, sizeof(i)); 2106 if (error != 0 && error != ENOENT) 2107 goto done_deref; 2108 } 2109 for (bf = pr_flag_allow; 2110 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 2111 bf++) { 2112 i = (pr->pr_allow & bf->flag) ? 1 : 0; 2113 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2114 if (error != 0 && error != ENOENT) 2115 goto done_deref; 2116 i = !i; 2117 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2118 if (error != 0 && error != ENOENT) 2119 goto done_deref; 2120 } 2121 i = (pr->pr_uref == 0); 2122 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2123 if (error != 0 && error != ENOENT) 2124 goto done_deref; 2125 i = !i; 2126 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2127 if (error != 0 && error != ENOENT) 2128 goto done_deref; 2129 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2130 sizeof(pr->pr_osreldate)); 2131 if (error != 0 && error != ENOENT) 2132 goto done_deref; 2133 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2134 if (error != 0 && error != ENOENT) 2135 goto done_deref; 2136 2137 /* Get the module parameters. */ 2138 mtx_unlock(&pr->pr_mtx); 2139 locked = 0; 2140 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2141 if (error) 2142 goto done_deref; 2143 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2144 2145 /* By now, all parameters should have been noted. */ 2146 TAILQ_FOREACH(opt, opts, link) { 2147 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2148 error = EINVAL; 2149 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2150 goto done_errmsg; 2151 } 2152 } 2153 2154 /* Write the fetched parameters back to userspace. */ 2155 error = 0; 2156 TAILQ_FOREACH(opt, opts, link) { 2157 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2158 pos = 2 * opt->pos + 1; 2159 optuio->uio_iov[pos].iov_len = opt->len; 2160 if (opt->value != NULL) { 2161 if (optuio->uio_segflg == UIO_SYSSPACE) { 2162 bcopy(opt->value, 2163 optuio->uio_iov[pos].iov_base, 2164 opt->len); 2165 } else { 2166 error = copyout(opt->value, 2167 optuio->uio_iov[pos].iov_base, 2168 opt->len); 2169 if (error) 2170 break; 2171 } 2172 } 2173 } 2174 } 2175 goto done_errmsg; 2176 2177 done_deref: 2178 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2179 goto done_errmsg; 2180 2181 done_unlock_list: 2182 sx_sunlock(&allprison_lock); 2183 done_errmsg: 2184 if (error && errmsg_pos >= 0) { 2185 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2186 errmsg_pos = 2 * errmsg_pos + 1; 2187 if (errmsg_len > 0) { 2188 if (optuio->uio_segflg == UIO_SYSSPACE) 2189 bcopy(errmsg, 2190 optuio->uio_iov[errmsg_pos].iov_base, 2191 errmsg_len); 2192 else 2193 copyout(errmsg, 2194 optuio->uio_iov[errmsg_pos].iov_base, 2195 errmsg_len); 2196 } 2197 } 2198 vfs_freeopts(opts); 2199 return (error); 2200 } 2201 2202 2203 /* 2204 * struct jail_remove_args { 2205 * int jid; 2206 * }; 2207 */ 2208 int 2209 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2210 { 2211 struct prison *pr, *cpr, *lpr, *tpr; 2212 int descend, error; 2213 2214 error = priv_check(td, PRIV_JAIL_REMOVE); 2215 if (error) 2216 return (error); 2217 2218 sx_xlock(&allprison_lock); 2219 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2220 if (pr == NULL) { 2221 sx_xunlock(&allprison_lock); 2222 return (EINVAL); 2223 } 2224 2225 /* Remove all descendants of this prison, then remove this prison. */ 2226 pr->pr_ref++; 2227 if (!LIST_EMPTY(&pr->pr_children)) { 2228 mtx_unlock(&pr->pr_mtx); 2229 lpr = NULL; 2230 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2231 mtx_lock(&cpr->pr_mtx); 2232 if (cpr->pr_ref > 0) { 2233 tpr = cpr; 2234 cpr->pr_ref++; 2235 } else { 2236 /* Already removed - do not do it again. */ 2237 tpr = NULL; 2238 } 2239 mtx_unlock(&cpr->pr_mtx); 2240 if (lpr != NULL) { 2241 mtx_lock(&lpr->pr_mtx); 2242 prison_remove_one(lpr); 2243 sx_xlock(&allprison_lock); 2244 } 2245 lpr = tpr; 2246 } 2247 if (lpr != NULL) { 2248 mtx_lock(&lpr->pr_mtx); 2249 prison_remove_one(lpr); 2250 sx_xlock(&allprison_lock); 2251 } 2252 mtx_lock(&pr->pr_mtx); 2253 } 2254 prison_remove_one(pr); 2255 return (0); 2256 } 2257 2258 static void 2259 prison_remove_one(struct prison *pr) 2260 { 2261 struct proc *p; 2262 int deuref; 2263 2264 /* If the prison was persistent, it is not anymore. */ 2265 deuref = 0; 2266 if (pr->pr_flags & PR_PERSIST) { 2267 pr->pr_ref--; 2268 deuref = PD_DEUREF; 2269 pr->pr_flags &= ~PR_PERSIST; 2270 } 2271 2272 /* 2273 * jail_remove added a reference. If that's the only one, remove 2274 * the prison now. 2275 */ 2276 KASSERT(pr->pr_ref > 0, 2277 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2278 if (pr->pr_ref == 1) { 2279 prison_deref(pr, 2280 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2281 return; 2282 } 2283 2284 mtx_unlock(&pr->pr_mtx); 2285 sx_xunlock(&allprison_lock); 2286 /* 2287 * Kill all processes unfortunate enough to be attached to this prison. 2288 */ 2289 sx_slock(&allproc_lock); 2290 FOREACH_PROC_IN_SYSTEM(p) { 2291 PROC_LOCK(p); 2292 if (p->p_state != PRS_NEW && p->p_ucred && 2293 p->p_ucred->cr_prison == pr) 2294 kern_psignal(p, SIGKILL); 2295 PROC_UNLOCK(p); 2296 } 2297 sx_sunlock(&allproc_lock); 2298 /* Remove the temporary reference added by jail_remove. */ 2299 prison_deref(pr, deuref | PD_DEREF); 2300 } 2301 2302 2303 /* 2304 * struct jail_attach_args { 2305 * int jid; 2306 * }; 2307 */ 2308 int 2309 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2310 { 2311 struct prison *pr; 2312 int error; 2313 2314 error = priv_check(td, PRIV_JAIL_ATTACH); 2315 if (error) 2316 return (error); 2317 2318 /* 2319 * Start with exclusive hold on allprison_lock to ensure that a possible 2320 * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove. 2321 * But then immediately downgrade it since we don't need to stop 2322 * readers. 2323 */ 2324 sx_xlock(&allprison_lock); 2325 sx_downgrade(&allprison_lock); 2326 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2327 if (pr == NULL) { 2328 sx_sunlock(&allprison_lock); 2329 return (EINVAL); 2330 } 2331 2332 /* 2333 * Do not allow a process to attach to a prison that is not 2334 * considered to be "alive". 2335 */ 2336 if (pr->pr_uref == 0) { 2337 mtx_unlock(&pr->pr_mtx); 2338 sx_sunlock(&allprison_lock); 2339 return (EINVAL); 2340 } 2341 2342 return (do_jail_attach(td, pr)); 2343 } 2344 2345 static int 2346 do_jail_attach(struct thread *td, struct prison *pr) 2347 { 2348 struct proc *p; 2349 struct ucred *newcred, *oldcred; 2350 int error; 2351 2352 /* 2353 * XXX: Note that there is a slight race here if two threads 2354 * in the same privileged process attempt to attach to two 2355 * different jails at the same time. It is important for 2356 * user processes not to do this, or they might end up with 2357 * a process root from one prison, but attached to the jail 2358 * of another. 2359 */ 2360 pr->pr_ref++; 2361 pr->pr_uref++; 2362 mtx_unlock(&pr->pr_mtx); 2363 2364 /* Let modules do whatever they need to prepare for attaching. */ 2365 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2366 if (error) { 2367 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2368 return (error); 2369 } 2370 sx_sunlock(&allprison_lock); 2371 2372 /* 2373 * Reparent the newly attached process to this jail. 2374 */ 2375 p = td->td_proc; 2376 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2377 if (error) 2378 goto e_revert_osd; 2379 2380 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2381 if ((error = change_dir(pr->pr_root, td)) != 0) 2382 goto e_unlock; 2383 #ifdef MAC 2384 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2385 goto e_unlock; 2386 #endif 2387 VOP_UNLOCK(pr->pr_root, 0); 2388 if ((error = pwd_chroot(td, pr->pr_root))) 2389 goto e_revert_osd; 2390 2391 newcred = crget(); 2392 PROC_LOCK(p); 2393 oldcred = crcopysafe(p, newcred); 2394 newcred->cr_prison = pr; 2395 proc_set_cred(p, newcred); 2396 setsugid(p); 2397 #ifdef RACCT 2398 racct_proc_ucred_changed(p, oldcred, newcred); 2399 crhold(newcred); 2400 #endif 2401 PROC_UNLOCK(p); 2402 #ifdef RCTL 2403 rctl_proc_ucred_changed(p, newcred); 2404 crfree(newcred); 2405 #endif 2406 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF); 2407 crfree(oldcred); 2408 return (0); 2409 2410 e_unlock: 2411 VOP_UNLOCK(pr->pr_root, 0); 2412 e_revert_osd: 2413 /* Tell modules this thread is still in its old jail after all. */ 2414 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2415 prison_deref(pr, PD_DEREF | PD_DEUREF); 2416 return (error); 2417 } 2418 2419 2420 /* 2421 * Returns a locked prison instance, or NULL on failure. 2422 */ 2423 struct prison * 2424 prison_find(int prid) 2425 { 2426 struct prison *pr; 2427 2428 sx_assert(&allprison_lock, SX_LOCKED); 2429 TAILQ_FOREACH(pr, &allprison, pr_list) { 2430 if (pr->pr_id == prid) { 2431 mtx_lock(&pr->pr_mtx); 2432 if (pr->pr_ref > 0) 2433 return (pr); 2434 mtx_unlock(&pr->pr_mtx); 2435 } 2436 } 2437 return (NULL); 2438 } 2439 2440 /* 2441 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2442 */ 2443 struct prison * 2444 prison_find_child(struct prison *mypr, int prid) 2445 { 2446 struct prison *pr; 2447 int descend; 2448 2449 sx_assert(&allprison_lock, SX_LOCKED); 2450 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2451 if (pr->pr_id == prid) { 2452 mtx_lock(&pr->pr_mtx); 2453 if (pr->pr_ref > 0) 2454 return (pr); 2455 mtx_unlock(&pr->pr_mtx); 2456 } 2457 } 2458 return (NULL); 2459 } 2460 2461 /* 2462 * Look for the name relative to mypr. Returns a locked prison or NULL. 2463 */ 2464 struct prison * 2465 prison_find_name(struct prison *mypr, const char *name) 2466 { 2467 struct prison *pr, *deadpr; 2468 size_t mylen; 2469 int descend; 2470 2471 sx_assert(&allprison_lock, SX_LOCKED); 2472 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2473 again: 2474 deadpr = NULL; 2475 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2476 if (!strcmp(pr->pr_name + mylen, name)) { 2477 mtx_lock(&pr->pr_mtx); 2478 if (pr->pr_ref > 0) { 2479 if (pr->pr_uref > 0) 2480 return (pr); 2481 deadpr = pr; 2482 } 2483 mtx_unlock(&pr->pr_mtx); 2484 } 2485 } 2486 /* There was no valid prison - perhaps there was a dying one. */ 2487 if (deadpr != NULL) { 2488 mtx_lock(&deadpr->pr_mtx); 2489 if (deadpr->pr_ref == 0) { 2490 mtx_unlock(&deadpr->pr_mtx); 2491 goto again; 2492 } 2493 } 2494 return (deadpr); 2495 } 2496 2497 /* 2498 * See if a prison has the specific flag set. 2499 */ 2500 int 2501 prison_flag(struct ucred *cred, unsigned flag) 2502 { 2503 2504 /* This is an atomic read, so no locking is necessary. */ 2505 return (cred->cr_prison->pr_flags & flag); 2506 } 2507 2508 int 2509 prison_allow(struct ucred *cred, unsigned flag) 2510 { 2511 2512 /* This is an atomic read, so no locking is necessary. */ 2513 return (cred->cr_prison->pr_allow & flag); 2514 } 2515 2516 /* 2517 * Remove a prison reference. If that was the last reference, remove the 2518 * prison itself - but not in this context in case there are locks held. 2519 */ 2520 void 2521 prison_free_locked(struct prison *pr) 2522 { 2523 int ref; 2524 2525 mtx_assert(&pr->pr_mtx, MA_OWNED); 2526 ref = --pr->pr_ref; 2527 mtx_unlock(&pr->pr_mtx); 2528 if (ref == 0) 2529 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2530 } 2531 2532 void 2533 prison_free(struct prison *pr) 2534 { 2535 2536 mtx_lock(&pr->pr_mtx); 2537 prison_free_locked(pr); 2538 } 2539 2540 /* 2541 * Complete a call to either prison_free or prison_proc_free. 2542 */ 2543 static void 2544 prison_complete(void *context, int pending) 2545 { 2546 struct prison *pr = context; 2547 2548 sx_xlock(&allprison_lock); 2549 mtx_lock(&pr->pr_mtx); 2550 prison_deref(pr, pr->pr_uref 2551 ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED 2552 : PD_LOCKED | PD_LIST_XLOCKED); 2553 } 2554 2555 /* 2556 * Remove a prison reference (usually). This internal version assumes no 2557 * mutexes are held, except perhaps the prison itself. If there are no more 2558 * references, release and delist the prison. On completion, the prison lock 2559 * and the allprison lock are both unlocked. 2560 */ 2561 static void 2562 prison_deref(struct prison *pr, int flags) 2563 { 2564 struct prison *ppr, *tpr; 2565 int ref, lasturef; 2566 2567 if (!(flags & PD_LOCKED)) 2568 mtx_lock(&pr->pr_mtx); 2569 for (;;) { 2570 if (flags & PD_DEUREF) { 2571 KASSERT(pr->pr_uref > 0, 2572 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 2573 pr->pr_id)); 2574 pr->pr_uref--; 2575 lasturef = pr->pr_uref == 0; 2576 if (lasturef) 2577 pr->pr_ref++; 2578 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2579 } else 2580 lasturef = 0; 2581 if (flags & PD_DEREF) { 2582 KASSERT(pr->pr_ref > 0, 2583 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 2584 pr->pr_id)); 2585 pr->pr_ref--; 2586 } 2587 ref = pr->pr_ref; 2588 mtx_unlock(&pr->pr_mtx); 2589 2590 /* 2591 * Tell the modules if the last user reference was removed 2592 * (even it sticks around in dying state). 2593 */ 2594 if (lasturef) { 2595 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) { 2596 sx_xlock(&allprison_lock); 2597 flags |= PD_LIST_XLOCKED; 2598 } 2599 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 2600 mtx_lock(&pr->pr_mtx); 2601 ref = --pr->pr_ref; 2602 mtx_unlock(&pr->pr_mtx); 2603 } 2604 2605 /* If the prison still has references, nothing else to do. */ 2606 if (ref > 0) { 2607 if (flags & PD_LIST_SLOCKED) 2608 sx_sunlock(&allprison_lock); 2609 else if (flags & PD_LIST_XLOCKED) 2610 sx_xunlock(&allprison_lock); 2611 return; 2612 } 2613 2614 if (flags & PD_LIST_SLOCKED) { 2615 if (!sx_try_upgrade(&allprison_lock)) { 2616 sx_sunlock(&allprison_lock); 2617 sx_xlock(&allprison_lock); 2618 } 2619 } else if (!(flags & PD_LIST_XLOCKED)) 2620 sx_xlock(&allprison_lock); 2621 2622 TAILQ_REMOVE(&allprison, pr, pr_list); 2623 LIST_REMOVE(pr, pr_sibling); 2624 ppr = pr->pr_parent; 2625 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2626 tpr->pr_childcount--; 2627 sx_xunlock(&allprison_lock); 2628 2629 #ifdef VIMAGE 2630 if (pr->pr_vnet != ppr->pr_vnet) 2631 vnet_destroy(pr->pr_vnet); 2632 #endif 2633 if (pr->pr_root != NULL) 2634 vrele(pr->pr_root); 2635 mtx_destroy(&pr->pr_mtx); 2636 #ifdef INET 2637 free(pr->pr_ip4, M_PRISON); 2638 #endif 2639 #ifdef INET6 2640 free(pr->pr_ip6, M_PRISON); 2641 #endif 2642 if (pr->pr_cpuset != NULL) 2643 cpuset_rel(pr->pr_cpuset); 2644 osd_jail_exit(pr); 2645 #ifdef RACCT 2646 if (racct_enable) 2647 prison_racct_detach(pr); 2648 #endif 2649 free(pr, M_PRISON); 2650 2651 /* Removing a prison frees a reference on its parent. */ 2652 pr = ppr; 2653 mtx_lock(&pr->pr_mtx); 2654 flags = PD_DEREF | PD_DEUREF; 2655 } 2656 } 2657 2658 void 2659 prison_hold_locked(struct prison *pr) 2660 { 2661 2662 mtx_assert(&pr->pr_mtx, MA_OWNED); 2663 KASSERT(pr->pr_ref > 0, 2664 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id)); 2665 pr->pr_ref++; 2666 } 2667 2668 void 2669 prison_hold(struct prison *pr) 2670 { 2671 2672 mtx_lock(&pr->pr_mtx); 2673 prison_hold_locked(pr); 2674 mtx_unlock(&pr->pr_mtx); 2675 } 2676 2677 void 2678 prison_proc_hold(struct prison *pr) 2679 { 2680 2681 mtx_lock(&pr->pr_mtx); 2682 KASSERT(pr->pr_uref > 0, 2683 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2684 pr->pr_uref++; 2685 mtx_unlock(&pr->pr_mtx); 2686 } 2687 2688 void 2689 prison_proc_free(struct prison *pr) 2690 { 2691 2692 mtx_lock(&pr->pr_mtx); 2693 KASSERT(pr->pr_uref > 0, 2694 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2695 if (pr->pr_uref > 1) 2696 pr->pr_uref--; 2697 else { 2698 /* 2699 * Don't remove the last user reference in this context, which 2700 * is expected to be a process that is not only locked, but 2701 * also half dead. 2702 */ 2703 pr->pr_ref++; 2704 mtx_unlock(&pr->pr_mtx); 2705 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2706 return; 2707 } 2708 mtx_unlock(&pr->pr_mtx); 2709 } 2710 2711 /* 2712 * Check if a jail supports the given address family. 2713 * 2714 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 2715 * if not. 2716 */ 2717 int 2718 prison_check_af(struct ucred *cred, int af) 2719 { 2720 struct prison *pr; 2721 int error; 2722 2723 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2724 2725 pr = cred->cr_prison; 2726 #ifdef VIMAGE 2727 /* Prisons with their own network stack are not limited. */ 2728 if (prison_owns_vnet(cred)) 2729 return (0); 2730 #endif 2731 2732 error = 0; 2733 switch (af) 2734 { 2735 #ifdef INET 2736 case AF_INET: 2737 if (pr->pr_flags & PR_IP4) 2738 { 2739 mtx_lock(&pr->pr_mtx); 2740 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 2741 error = EAFNOSUPPORT; 2742 mtx_unlock(&pr->pr_mtx); 2743 } 2744 break; 2745 #endif 2746 #ifdef INET6 2747 case AF_INET6: 2748 if (pr->pr_flags & PR_IP6) 2749 { 2750 mtx_lock(&pr->pr_mtx); 2751 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 2752 error = EAFNOSUPPORT; 2753 mtx_unlock(&pr->pr_mtx); 2754 } 2755 break; 2756 #endif 2757 case AF_LOCAL: 2758 case AF_ROUTE: 2759 break; 2760 default: 2761 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 2762 error = EAFNOSUPPORT; 2763 } 2764 return (error); 2765 } 2766 2767 /* 2768 * Check if given address belongs to the jail referenced by cred (wrapper to 2769 * prison_check_ip[46]). 2770 * 2771 * Returns 0 if jail doesn't restrict the address family or if address belongs 2772 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 2773 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 2774 */ 2775 int 2776 prison_if(struct ucred *cred, struct sockaddr *sa) 2777 { 2778 #ifdef INET 2779 struct sockaddr_in *sai; 2780 #endif 2781 #ifdef INET6 2782 struct sockaddr_in6 *sai6; 2783 #endif 2784 int error; 2785 2786 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2787 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 2788 2789 #ifdef VIMAGE 2790 if (prison_owns_vnet(cred)) 2791 return (0); 2792 #endif 2793 2794 error = 0; 2795 switch (sa->sa_family) 2796 { 2797 #ifdef INET 2798 case AF_INET: 2799 sai = (struct sockaddr_in *)sa; 2800 error = prison_check_ip4(cred, &sai->sin_addr); 2801 break; 2802 #endif 2803 #ifdef INET6 2804 case AF_INET6: 2805 sai6 = (struct sockaddr_in6 *)sa; 2806 error = prison_check_ip6(cred, &sai6->sin6_addr); 2807 break; 2808 #endif 2809 default: 2810 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 2811 error = EAFNOSUPPORT; 2812 } 2813 return (error); 2814 } 2815 2816 /* 2817 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 2818 */ 2819 int 2820 prison_check(struct ucred *cred1, struct ucred *cred2) 2821 { 2822 2823 return ((cred1->cr_prison == cred2->cr_prison || 2824 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 2825 } 2826 2827 /* 2828 * Return 1 if p2 is a child of p1, otherwise 0. 2829 */ 2830 int 2831 prison_ischild(struct prison *pr1, struct prison *pr2) 2832 { 2833 2834 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 2835 if (pr1 == pr2) 2836 return (1); 2837 return (0); 2838 } 2839 2840 /* 2841 * Return 1 if the passed credential is in a jail, otherwise 0. 2842 */ 2843 int 2844 jailed(struct ucred *cred) 2845 { 2846 2847 return (cred->cr_prison != &prison0); 2848 } 2849 2850 /* 2851 * Return 1 if the passed credential is in a jail and that jail does not 2852 * have its own virtual network stack, otherwise 0. 2853 */ 2854 int 2855 jailed_without_vnet(struct ucred *cred) 2856 { 2857 2858 if (!jailed(cred)) 2859 return (0); 2860 #ifdef VIMAGE 2861 if (prison_owns_vnet(cred)) 2862 return (0); 2863 #endif 2864 2865 return (1); 2866 } 2867 2868 /* 2869 * Return the correct hostname (domainname, et al) for the passed credential. 2870 */ 2871 void 2872 getcredhostname(struct ucred *cred, char *buf, size_t size) 2873 { 2874 struct prison *pr; 2875 2876 /* 2877 * A NULL credential can be used to shortcut to the physical 2878 * system's hostname. 2879 */ 2880 pr = (cred != NULL) ? cred->cr_prison : &prison0; 2881 mtx_lock(&pr->pr_mtx); 2882 strlcpy(buf, pr->pr_hostname, size); 2883 mtx_unlock(&pr->pr_mtx); 2884 } 2885 2886 void 2887 getcreddomainname(struct ucred *cred, char *buf, size_t size) 2888 { 2889 2890 mtx_lock(&cred->cr_prison->pr_mtx); 2891 strlcpy(buf, cred->cr_prison->pr_domainname, size); 2892 mtx_unlock(&cred->cr_prison->pr_mtx); 2893 } 2894 2895 void 2896 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 2897 { 2898 2899 mtx_lock(&cred->cr_prison->pr_mtx); 2900 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 2901 mtx_unlock(&cred->cr_prison->pr_mtx); 2902 } 2903 2904 void 2905 getcredhostid(struct ucred *cred, unsigned long *hostid) 2906 { 2907 2908 mtx_lock(&cred->cr_prison->pr_mtx); 2909 *hostid = cred->cr_prison->pr_hostid; 2910 mtx_unlock(&cred->cr_prison->pr_mtx); 2911 } 2912 2913 #ifdef VIMAGE 2914 /* 2915 * Determine whether the prison represented by cred owns 2916 * its vnet rather than having it inherited. 2917 * 2918 * Returns 1 in case the prison owns the vnet, 0 otherwise. 2919 */ 2920 int 2921 prison_owns_vnet(struct ucred *cred) 2922 { 2923 2924 /* 2925 * vnets cannot be added/removed after jail creation, 2926 * so no need to lock here. 2927 */ 2928 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 2929 } 2930 #endif 2931 2932 /* 2933 * Determine whether the subject represented by cred can "see" 2934 * status of a mount point. 2935 * Returns: 0 for permitted, ENOENT otherwise. 2936 * XXX: This function should be called cr_canseemount() and should be 2937 * placed in kern_prot.c. 2938 */ 2939 int 2940 prison_canseemount(struct ucred *cred, struct mount *mp) 2941 { 2942 struct prison *pr; 2943 struct statfs *sp; 2944 size_t len; 2945 2946 pr = cred->cr_prison; 2947 if (pr->pr_enforce_statfs == 0) 2948 return (0); 2949 if (pr->pr_root->v_mount == mp) 2950 return (0); 2951 if (pr->pr_enforce_statfs == 2) 2952 return (ENOENT); 2953 /* 2954 * If jail's chroot directory is set to "/" we should be able to see 2955 * all mount-points from inside a jail. 2956 * This is ugly check, but this is the only situation when jail's 2957 * directory ends with '/'. 2958 */ 2959 if (strcmp(pr->pr_path, "/") == 0) 2960 return (0); 2961 len = strlen(pr->pr_path); 2962 sp = &mp->mnt_stat; 2963 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 2964 return (ENOENT); 2965 /* 2966 * Be sure that we don't have situation where jail's root directory 2967 * is "/some/path" and mount point is "/some/pathpath". 2968 */ 2969 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 2970 return (ENOENT); 2971 return (0); 2972 } 2973 2974 void 2975 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 2976 { 2977 char jpath[MAXPATHLEN]; 2978 struct prison *pr; 2979 size_t len; 2980 2981 pr = cred->cr_prison; 2982 if (pr->pr_enforce_statfs == 0) 2983 return; 2984 if (prison_canseemount(cred, mp) != 0) { 2985 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 2986 strlcpy(sp->f_mntonname, "[restricted]", 2987 sizeof(sp->f_mntonname)); 2988 return; 2989 } 2990 if (pr->pr_root->v_mount == mp) { 2991 /* 2992 * Clear current buffer data, so we are sure nothing from 2993 * the valid path left there. 2994 */ 2995 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 2996 *sp->f_mntonname = '/'; 2997 return; 2998 } 2999 /* 3000 * If jail's chroot directory is set to "/" we should be able to see 3001 * all mount-points from inside a jail. 3002 */ 3003 if (strcmp(pr->pr_path, "/") == 0) 3004 return; 3005 len = strlen(pr->pr_path); 3006 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3007 /* 3008 * Clear current buffer data, so we are sure nothing from 3009 * the valid path left there. 3010 */ 3011 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3012 if (*jpath == '\0') { 3013 /* Should never happen. */ 3014 *sp->f_mntonname = '/'; 3015 } else { 3016 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3017 } 3018 } 3019 3020 /* 3021 * Check with permission for a specific privilege is granted within jail. We 3022 * have a specific list of accepted privileges; the rest are denied. 3023 */ 3024 int 3025 prison_priv_check(struct ucred *cred, int priv) 3026 { 3027 3028 if (!jailed(cred)) 3029 return (0); 3030 3031 #ifdef VIMAGE 3032 /* 3033 * Privileges specific to prisons with a virtual network stack. 3034 * There might be a duplicate entry here in case the privilege 3035 * is only granted conditionally in the legacy jail case. 3036 */ 3037 switch (priv) { 3038 #ifdef notyet 3039 /* 3040 * NFS-specific privileges. 3041 */ 3042 case PRIV_NFS_DAEMON: 3043 case PRIV_NFS_LOCKD: 3044 #endif 3045 /* 3046 * Network stack privileges. 3047 */ 3048 case PRIV_NET_BRIDGE: 3049 case PRIV_NET_GRE: 3050 case PRIV_NET_BPF: 3051 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3052 case PRIV_NET_ROUTE: 3053 case PRIV_NET_TAP: 3054 case PRIV_NET_SETIFMTU: 3055 case PRIV_NET_SETIFFLAGS: 3056 case PRIV_NET_SETIFCAP: 3057 case PRIV_NET_SETIFDESCR: 3058 case PRIV_NET_SETIFNAME : 3059 case PRIV_NET_SETIFMETRIC: 3060 case PRIV_NET_SETIFPHYS: 3061 case PRIV_NET_SETIFMAC: 3062 case PRIV_NET_ADDMULTI: 3063 case PRIV_NET_DELMULTI: 3064 case PRIV_NET_HWIOCTL: 3065 case PRIV_NET_SETLLADDR: 3066 case PRIV_NET_ADDIFGROUP: 3067 case PRIV_NET_DELIFGROUP: 3068 case PRIV_NET_IFCREATE: 3069 case PRIV_NET_IFDESTROY: 3070 case PRIV_NET_ADDIFADDR: 3071 case PRIV_NET_DELIFADDR: 3072 case PRIV_NET_LAGG: 3073 case PRIV_NET_GIF: 3074 case PRIV_NET_SETIFVNET: 3075 case PRIV_NET_SETIFFIB: 3076 3077 /* 3078 * 802.11-related privileges. 3079 */ 3080 case PRIV_NET80211_GETKEY: 3081 #ifdef notyet 3082 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3083 #endif 3084 3085 #ifdef notyet 3086 /* 3087 * ATM privileges. 3088 */ 3089 case PRIV_NETATM_CFG: 3090 case PRIV_NETATM_ADD: 3091 case PRIV_NETATM_DEL: 3092 case PRIV_NETATM_SET: 3093 3094 /* 3095 * Bluetooth privileges. 3096 */ 3097 case PRIV_NETBLUETOOTH_RAW: 3098 #endif 3099 3100 /* 3101 * Netgraph and netgraph module privileges. 3102 */ 3103 case PRIV_NETGRAPH_CONTROL: 3104 #ifdef notyet 3105 case PRIV_NETGRAPH_TTY: 3106 #endif 3107 3108 /* 3109 * IPv4 and IPv6 privileges. 3110 */ 3111 case PRIV_NETINET_IPFW: 3112 case PRIV_NETINET_DIVERT: 3113 case PRIV_NETINET_PF: 3114 case PRIV_NETINET_DUMMYNET: 3115 case PRIV_NETINET_CARP: 3116 case PRIV_NETINET_MROUTE: 3117 case PRIV_NETINET_RAW: 3118 case PRIV_NETINET_ADDRCTRL6: 3119 case PRIV_NETINET_ND6: 3120 case PRIV_NETINET_SCOPE6: 3121 case PRIV_NETINET_ALIFETIME6: 3122 case PRIV_NETINET_IPSEC: 3123 case PRIV_NETINET_BINDANY: 3124 3125 #ifdef notyet 3126 /* 3127 * NCP privileges. 3128 */ 3129 case PRIV_NETNCP: 3130 3131 /* 3132 * SMB privileges. 3133 */ 3134 case PRIV_NETSMB: 3135 #endif 3136 3137 /* 3138 * No default: or deny here. 3139 * In case of no permit fall through to next switch(). 3140 */ 3141 if (cred->cr_prison->pr_flags & PR_VNET) 3142 return (0); 3143 } 3144 #endif /* VIMAGE */ 3145 3146 switch (priv) { 3147 3148 /* 3149 * Allow ktrace privileges for root in jail. 3150 */ 3151 case PRIV_KTRACE: 3152 3153 #if 0 3154 /* 3155 * Allow jailed processes to configure audit identity and 3156 * submit audit records (login, etc). In the future we may 3157 * want to further refine the relationship between audit and 3158 * jail. 3159 */ 3160 case PRIV_AUDIT_GETAUDIT: 3161 case PRIV_AUDIT_SETAUDIT: 3162 case PRIV_AUDIT_SUBMIT: 3163 #endif 3164 3165 /* 3166 * Allow jailed processes to manipulate process UNIX 3167 * credentials in any way they see fit. 3168 */ 3169 case PRIV_CRED_SETUID: 3170 case PRIV_CRED_SETEUID: 3171 case PRIV_CRED_SETGID: 3172 case PRIV_CRED_SETEGID: 3173 case PRIV_CRED_SETGROUPS: 3174 case PRIV_CRED_SETREUID: 3175 case PRIV_CRED_SETREGID: 3176 case PRIV_CRED_SETRESUID: 3177 case PRIV_CRED_SETRESGID: 3178 3179 /* 3180 * Jail implements visibility constraints already, so allow 3181 * jailed root to override uid/gid-based constraints. 3182 */ 3183 case PRIV_SEEOTHERGIDS: 3184 case PRIV_SEEOTHERUIDS: 3185 3186 /* 3187 * Jail implements inter-process debugging limits already, so 3188 * allow jailed root various debugging privileges. 3189 */ 3190 case PRIV_DEBUG_DIFFCRED: 3191 case PRIV_DEBUG_SUGID: 3192 case PRIV_DEBUG_UNPRIV: 3193 3194 /* 3195 * Allow jail to set various resource limits and login 3196 * properties, and for now, exceed process resource limits. 3197 */ 3198 case PRIV_PROC_LIMIT: 3199 case PRIV_PROC_SETLOGIN: 3200 case PRIV_PROC_SETRLIMIT: 3201 3202 /* 3203 * System V and POSIX IPC privileges are granted in jail. 3204 */ 3205 case PRIV_IPC_READ: 3206 case PRIV_IPC_WRITE: 3207 case PRIV_IPC_ADMIN: 3208 case PRIV_IPC_MSGSIZE: 3209 case PRIV_MQ_ADMIN: 3210 3211 /* 3212 * Jail operations within a jail work on child jails. 3213 */ 3214 case PRIV_JAIL_ATTACH: 3215 case PRIV_JAIL_SET: 3216 case PRIV_JAIL_REMOVE: 3217 3218 /* 3219 * Jail implements its own inter-process limits, so allow 3220 * root processes in jail to change scheduling on other 3221 * processes in the same jail. Likewise for signalling. 3222 */ 3223 case PRIV_SCHED_DIFFCRED: 3224 case PRIV_SCHED_CPUSET: 3225 case PRIV_SIGNAL_DIFFCRED: 3226 case PRIV_SIGNAL_SUGID: 3227 3228 /* 3229 * Allow jailed processes to write to sysctls marked as jail 3230 * writable. 3231 */ 3232 case PRIV_SYSCTL_WRITEJAIL: 3233 3234 /* 3235 * Allow root in jail to manage a variety of quota 3236 * properties. These should likely be conditional on a 3237 * configuration option. 3238 */ 3239 case PRIV_VFS_GETQUOTA: 3240 case PRIV_VFS_SETQUOTA: 3241 3242 /* 3243 * Since Jail relies on chroot() to implement file system 3244 * protections, grant many VFS privileges to root in jail. 3245 * Be careful to exclude mount-related and NFS-related 3246 * privileges. 3247 */ 3248 case PRIV_VFS_READ: 3249 case PRIV_VFS_WRITE: 3250 case PRIV_VFS_ADMIN: 3251 case PRIV_VFS_EXEC: 3252 case PRIV_VFS_LOOKUP: 3253 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3254 case PRIV_VFS_CHFLAGS_DEV: 3255 case PRIV_VFS_CHOWN: 3256 case PRIV_VFS_CHROOT: 3257 case PRIV_VFS_RETAINSUGID: 3258 case PRIV_VFS_FCHROOT: 3259 case PRIV_VFS_LINK: 3260 case PRIV_VFS_SETGID: 3261 case PRIV_VFS_STAT: 3262 case PRIV_VFS_STICKYFILE: 3263 3264 /* 3265 * As in the non-jail case, non-root users are expected to be 3266 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3267 * exists in the jail and they have permission to access it). 3268 */ 3269 case PRIV_KMEM_READ: 3270 return (0); 3271 3272 /* 3273 * Depending on the global setting, allow privilege of 3274 * setting system flags. 3275 */ 3276 case PRIV_VFS_SYSFLAGS: 3277 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3278 return (0); 3279 else 3280 return (EPERM); 3281 3282 /* 3283 * Depending on the global setting, allow privilege of 3284 * mounting/unmounting file systems. 3285 */ 3286 case PRIV_VFS_MOUNT: 3287 case PRIV_VFS_UNMOUNT: 3288 case PRIV_VFS_MOUNT_NONUSER: 3289 case PRIV_VFS_MOUNT_OWNER: 3290 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3291 cred->cr_prison->pr_enforce_statfs < 2) 3292 return (0); 3293 else 3294 return (EPERM); 3295 3296 /* 3297 * Conditionnaly allow locking (unlocking) physical pages 3298 * in memory. 3299 */ 3300 case PRIV_VM_MLOCK: 3301 case PRIV_VM_MUNLOCK: 3302 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK) 3303 return (0); 3304 else 3305 return (EPERM); 3306 3307 /* 3308 * Conditionally allow jailed root to bind reserved ports. 3309 */ 3310 case PRIV_NETINET_RESERVEDPORT: 3311 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS) 3312 return (0); 3313 else 3314 return (EPERM); 3315 3316 /* 3317 * Allow jailed root to reuse in-use ports. 3318 */ 3319 case PRIV_NETINET_REUSEPORT: 3320 return (0); 3321 3322 /* 3323 * Allow jailed root to set certain IPv4/6 (option) headers. 3324 */ 3325 case PRIV_NETINET_SETHDROPTS: 3326 return (0); 3327 3328 /* 3329 * Conditionally allow creating raw sockets in jail. 3330 */ 3331 case PRIV_NETINET_RAW: 3332 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3333 return (0); 3334 else 3335 return (EPERM); 3336 3337 /* 3338 * Since jail implements its own visibility limits on netstat 3339 * sysctls, allow getcred. This allows identd to work in 3340 * jail. 3341 */ 3342 case PRIV_NETINET_GETCRED: 3343 return (0); 3344 3345 /* 3346 * Allow jailed root to set loginclass. 3347 */ 3348 case PRIV_PROC_SETLOGINCLASS: 3349 return (0); 3350 3351 default: 3352 /* 3353 * In all remaining cases, deny the privilege request. This 3354 * includes almost all network privileges, many system 3355 * configuration privileges. 3356 */ 3357 return (EPERM); 3358 } 3359 } 3360 3361 /* 3362 * Return the part of pr2's name that is relative to pr1, or the whole name 3363 * if it does not directly follow. 3364 */ 3365 3366 char * 3367 prison_name(struct prison *pr1, struct prison *pr2) 3368 { 3369 char *name; 3370 3371 /* Jails see themselves as "0" (if they see themselves at all). */ 3372 if (pr1 == pr2) 3373 return "0"; 3374 name = pr2->pr_name; 3375 if (prison_ischild(pr1, pr2)) { 3376 /* 3377 * pr1 isn't locked (and allprison_lock may not be either) 3378 * so its length can't be counted on. But the number of dots 3379 * can be counted on - and counted. 3380 */ 3381 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3382 name = strchr(name, '.') + 1; 3383 } 3384 return (name); 3385 } 3386 3387 /* 3388 * Return the part of pr2's path that is relative to pr1, or the whole path 3389 * if it does not directly follow. 3390 */ 3391 static char * 3392 prison_path(struct prison *pr1, struct prison *pr2) 3393 { 3394 char *path1, *path2; 3395 int len1; 3396 3397 path1 = pr1->pr_path; 3398 path2 = pr2->pr_path; 3399 if (!strcmp(path1, "/")) 3400 return (path2); 3401 len1 = strlen(path1); 3402 if (strncmp(path1, path2, len1)) 3403 return (path2); 3404 if (path2[len1] == '\0') 3405 return "/"; 3406 if (path2[len1] == '/') 3407 return (path2 + len1); 3408 return (path2); 3409 } 3410 3411 3412 /* 3413 * Jail-related sysctls. 3414 */ 3415 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 3416 "Jails"); 3417 3418 static int 3419 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3420 { 3421 struct xprison *xp; 3422 struct prison *pr, *cpr; 3423 #ifdef INET 3424 struct in_addr *ip4 = NULL; 3425 int ip4s = 0; 3426 #endif 3427 #ifdef INET6 3428 struct in6_addr *ip6 = NULL; 3429 int ip6s = 0; 3430 #endif 3431 int descend, error; 3432 3433 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3434 pr = req->td->td_ucred->cr_prison; 3435 error = 0; 3436 sx_slock(&allprison_lock); 3437 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3438 #if defined(INET) || defined(INET6) 3439 again: 3440 #endif 3441 mtx_lock(&cpr->pr_mtx); 3442 #ifdef INET 3443 if (cpr->pr_ip4s > 0) { 3444 if (ip4s < cpr->pr_ip4s) { 3445 ip4s = cpr->pr_ip4s; 3446 mtx_unlock(&cpr->pr_mtx); 3447 ip4 = realloc(ip4, ip4s * 3448 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3449 goto again; 3450 } 3451 bcopy(cpr->pr_ip4, ip4, 3452 cpr->pr_ip4s * sizeof(struct in_addr)); 3453 } 3454 #endif 3455 #ifdef INET6 3456 if (cpr->pr_ip6s > 0) { 3457 if (ip6s < cpr->pr_ip6s) { 3458 ip6s = cpr->pr_ip6s; 3459 mtx_unlock(&cpr->pr_mtx); 3460 ip6 = realloc(ip6, ip6s * 3461 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 3462 goto again; 3463 } 3464 bcopy(cpr->pr_ip6, ip6, 3465 cpr->pr_ip6s * sizeof(struct in6_addr)); 3466 } 3467 #endif 3468 if (cpr->pr_ref == 0) { 3469 mtx_unlock(&cpr->pr_mtx); 3470 continue; 3471 } 3472 bzero(xp, sizeof(*xp)); 3473 xp->pr_version = XPRISON_VERSION; 3474 xp->pr_id = cpr->pr_id; 3475 xp->pr_state = cpr->pr_uref > 0 3476 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 3477 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 3478 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 3479 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 3480 #ifdef INET 3481 xp->pr_ip4s = cpr->pr_ip4s; 3482 #endif 3483 #ifdef INET6 3484 xp->pr_ip6s = cpr->pr_ip6s; 3485 #endif 3486 mtx_unlock(&cpr->pr_mtx); 3487 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 3488 if (error) 3489 break; 3490 #ifdef INET 3491 if (xp->pr_ip4s > 0) { 3492 error = SYSCTL_OUT(req, ip4, 3493 xp->pr_ip4s * sizeof(struct in_addr)); 3494 if (error) 3495 break; 3496 } 3497 #endif 3498 #ifdef INET6 3499 if (xp->pr_ip6s > 0) { 3500 error = SYSCTL_OUT(req, ip6, 3501 xp->pr_ip6s * sizeof(struct in6_addr)); 3502 if (error) 3503 break; 3504 } 3505 #endif 3506 } 3507 sx_sunlock(&allprison_lock); 3508 free(xp, M_TEMP); 3509 #ifdef INET 3510 free(ip4, M_TEMP); 3511 #endif 3512 #ifdef INET6 3513 free(ip6, M_TEMP); 3514 #endif 3515 return (error); 3516 } 3517 3518 SYSCTL_OID(_security_jail, OID_AUTO, list, 3519 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3520 sysctl_jail_list, "S", "List of active jails"); 3521 3522 static int 3523 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 3524 { 3525 int error, injail; 3526 3527 injail = jailed(req->td->td_ucred); 3528 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 3529 3530 return (error); 3531 } 3532 3533 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 3534 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3535 sysctl_jail_jailed, "I", "Process in jail?"); 3536 3537 static int 3538 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 3539 { 3540 int error, havevnet; 3541 #ifdef VIMAGE 3542 struct ucred *cred = req->td->td_ucred; 3543 3544 havevnet = jailed(cred) && prison_owns_vnet(cred); 3545 #else 3546 havevnet = 0; 3547 #endif 3548 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 3549 3550 return (error); 3551 } 3552 3553 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 3554 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3555 sysctl_jail_vnet, "I", "Jail owns vnet?"); 3556 3557 #if defined(INET) || defined(INET6) 3558 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 3559 &jail_max_af_ips, 0, 3560 "Number of IP addresses a jail may have at most per address family (deprecated)"); 3561 #endif 3562 3563 /* 3564 * Default parameters for jail(2) compatibility. For historical reasons, 3565 * the sysctl names have varying similarity to the parameter names. Prisons 3566 * just see their own parameters, and can't change them. 3567 */ 3568 static int 3569 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 3570 { 3571 struct prison *pr; 3572 int allow, error, i; 3573 3574 pr = req->td->td_ucred->cr_prison; 3575 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 3576 3577 /* Get the current flag value, and convert it to a boolean. */ 3578 i = (allow & arg2) ? 1 : 0; 3579 if (arg1 != NULL) 3580 i = !i; 3581 error = sysctl_handle_int(oidp, &i, 0, req); 3582 if (error || !req->newptr) 3583 return (error); 3584 i = i ? arg2 : 0; 3585 if (arg1 != NULL) 3586 i ^= arg2; 3587 /* 3588 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 3589 * for writing. 3590 */ 3591 mtx_lock(&prison0.pr_mtx); 3592 jail_default_allow = (jail_default_allow & ~arg2) | i; 3593 mtx_unlock(&prison0.pr_mtx); 3594 return (0); 3595 } 3596 3597 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 3598 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3599 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 3600 "Processes in jail can set their hostnames (deprecated)"); 3601 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 3602 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3603 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 3604 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 3605 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 3606 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3607 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 3608 "Processes in jail can use System V IPC primitives (deprecated)"); 3609 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 3610 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3611 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 3612 "Prison root can create raw sockets (deprecated)"); 3613 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 3614 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3615 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 3616 "Processes in jail can alter system file flags (deprecated)"); 3617 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 3618 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3619 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 3620 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 3621 3622 static int 3623 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 3624 { 3625 struct prison *pr; 3626 int level, error; 3627 3628 pr = req->td->td_ucred->cr_prison; 3629 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 3630 error = sysctl_handle_int(oidp, &level, 0, req); 3631 if (error || !req->newptr) 3632 return (error); 3633 *(int *)arg1 = level; 3634 return (0); 3635 } 3636 3637 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 3638 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3639 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 3640 sysctl_jail_default_level, "I", 3641 "Processes in jail cannot see all mounted file systems (deprecated)"); 3642 3643 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 3644 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 3645 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 3646 sysctl_jail_default_level, "I", 3647 "Ruleset for the devfs filesystem in jail (deprecated)"); 3648 3649 /* 3650 * Nodes to describe jail parameters. Maximum length of string parameters 3651 * is returned in the string itself, and the other parameters exist merely 3652 * to make themselves and their types known. 3653 */ 3654 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 3655 "Jail parameters"); 3656 3657 int 3658 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 3659 { 3660 int i; 3661 long l; 3662 size_t s; 3663 char numbuf[12]; 3664 3665 switch (oidp->oid_kind & CTLTYPE) 3666 { 3667 case CTLTYPE_LONG: 3668 case CTLTYPE_ULONG: 3669 l = 0; 3670 #ifdef SCTL_MASK32 3671 if (!(req->flags & SCTL_MASK32)) 3672 #endif 3673 return (SYSCTL_OUT(req, &l, sizeof(l))); 3674 case CTLTYPE_INT: 3675 case CTLTYPE_UINT: 3676 i = 0; 3677 return (SYSCTL_OUT(req, &i, sizeof(i))); 3678 case CTLTYPE_STRING: 3679 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 3680 return 3681 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 3682 case CTLTYPE_STRUCT: 3683 s = (size_t)arg2; 3684 return (SYSCTL_OUT(req, &s, sizeof(s))); 3685 } 3686 return (0); 3687 } 3688 3689 /* 3690 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 3691 * jail creation time but cannot be changed in an existing jail. 3692 */ 3693 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 3694 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 3695 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 3696 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 3697 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 3698 "I", "Jail secure level"); 3699 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 3700 "Jail value for kern.osreldate and uname -K"); 3701 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 3702 "Jail value for kern.osrelease and uname -r"); 3703 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 3704 "I", "Jail cannot see all mounted file systems"); 3705 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 3706 "I", "Ruleset for in-jail devfs mounts"); 3707 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 3708 "B", "Jail persistence"); 3709 #ifdef VIMAGE 3710 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 3711 "E,jailsys", "Virtual network stack"); 3712 #endif 3713 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 3714 "B", "Jail is in the process of shutting down"); 3715 3716 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 3717 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 3718 "I", "Current number of child jails"); 3719 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 3720 "I", "Maximum number of child jails"); 3721 3722 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 3723 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 3724 "Jail hostname"); 3725 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 3726 "Jail NIS domainname"); 3727 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 3728 "Jail host UUID"); 3729 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 3730 "LU", "Jail host ID"); 3731 3732 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 3733 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 3734 3735 #ifdef INET 3736 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 3737 "Jail IPv4 address virtualization"); 3738 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 3739 "S,in_addr,a", "Jail IPv4 addresses"); 3740 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3741 "B", "Do (not) use IPv4 source address selection rather than the " 3742 "primary jail IPv4 address."); 3743 #endif 3744 #ifdef INET6 3745 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 3746 "Jail IPv6 address virtualization"); 3747 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 3748 "S,in6_addr,a", "Jail IPv6 addresses"); 3749 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3750 "B", "Do (not) use IPv6 source address selection rather than the " 3751 "primary jail IPv6 address."); 3752 #endif 3753 3754 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 3755 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 3756 "B", "Jail may set hostname"); 3757 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 3758 "B", "Jail may use SYSV IPC"); 3759 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 3760 "B", "Jail may create raw sockets"); 3761 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 3762 "B", "Jail may alter system file flags"); 3763 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 3764 "B", "Jail may set file quotas"); 3765 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 3766 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 3767 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW, 3768 "B", "Jail may lock (unlock) physical pages in memory"); 3769 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW, 3770 "B", "Jail may bind sockets to reserved ports"); 3771 3772 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 3773 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 3774 "B", "Jail may mount/unmount jail-friendly file systems in general"); 3775 3776 /* 3777 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return 3778 * its associated bit in the pr_allow bitmask, or zero if the parameter was 3779 * not created. 3780 */ 3781 unsigned 3782 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr, 3783 const char *descr) 3784 { 3785 struct bool_flags *bf; 3786 struct sysctl_oid *parent; 3787 char *allow_name, *allow_noname, *allowed; 3788 #ifndef NO_SYSCTL_DESCR 3789 char *descr_deprecated; 3790 #endif 3791 unsigned allow_flag; 3792 3793 if (prefix 3794 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name) 3795 < 0 || 3796 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name) 3797 < 0 3798 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 || 3799 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) { 3800 free(allow_name, M_PRISON); 3801 return 0; 3802 } 3803 3804 /* 3805 * See if this parameter has already beed added, i.e. a module was 3806 * previously loaded/unloaded. 3807 */ 3808 mtx_lock(&prison0.pr_mtx); 3809 for (bf = pr_flag_allow; 3810 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 3811 bf++) { 3812 if (strcmp(bf->name, allow_name) == 0) { 3813 allow_flag = bf->flag; 3814 goto no_add; 3815 } 3816 } 3817 3818 /* 3819 * Find a free bit in prison0's pr_allow, failing if there are none 3820 * (which shouldn't happen as long as we keep track of how many 3821 * potential dynamic flags exist). 3822 */ 3823 for (allow_flag = 1;; allow_flag <<= 1) { 3824 if (allow_flag == 0) 3825 goto no_add; 3826 if ((prison0.pr_allow & allow_flag) == 0) 3827 break; 3828 } 3829 3830 /* 3831 * Note the parameter in the next open slot in pr_flag_allow. 3832 * Set the flag last so code that checks pr_flag_allow can do so 3833 * without locking. 3834 */ 3835 for (bf = pr_flag_allow; bf->flag != 0; bf++) 3836 if (bf == pr_flag_allow + nitems(pr_flag_allow)) { 3837 /* This should never happen, but is not fatal. */ 3838 allow_flag = 0; 3839 goto no_add; 3840 } 3841 prison0.pr_allow |= allow_flag; 3842 bf->name = allow_name; 3843 bf->noname = allow_noname; 3844 bf->flag = allow_flag; 3845 mtx_unlock(&prison0.pr_mtx); 3846 3847 /* 3848 * Create sysctls for the paramter, and the back-compat global 3849 * permission. 3850 */ 3851 parent = prefix 3852 ? SYSCTL_ADD_NODE(NULL, 3853 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow), 3854 OID_AUTO, prefix, 0, 0, prefix_descr) 3855 : &sysctl___security_jail_param_allow; 3856 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO, 3857 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3858 NULL, 0, sysctl_jail_param, "B", descr); 3859 if ((prefix 3860 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name) 3861 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) { 3862 #ifndef NO_SYSCTL_DESCR 3863 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)", 3864 descr); 3865 #endif 3866 (void)SYSCTL_ADD_PROC(NULL, 3867 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed, 3868 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag, 3869 sysctl_jail_default_allow, "I", descr_deprecated); 3870 #ifndef NO_SYSCTL_DESCR 3871 free(descr_deprecated, M_TEMP); 3872 #endif 3873 free(allowed, M_TEMP); 3874 } 3875 return allow_flag; 3876 3877 no_add: 3878 mtx_unlock(&prison0.pr_mtx); 3879 free(allow_name, M_PRISON); 3880 free(allow_noname, M_PRISON); 3881 return allow_flag; 3882 } 3883 3884 /* 3885 * The VFS system will register jail-aware filesystems here. They each get 3886 * a parameter allow.mount.xxxfs and a flag to check when a jailed user 3887 * attempts to mount. 3888 */ 3889 void 3890 prison_add_vfs(struct vfsconf *vfsp) 3891 { 3892 #ifdef NO_SYSCTL_DESCR 3893 3894 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 3895 NULL, NULL); 3896 #else 3897 char *descr; 3898 3899 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system", 3900 vfsp->vfc_name); 3901 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 3902 NULL, descr); 3903 free(descr, M_TEMP); 3904 #endif 3905 } 3906 3907 #ifdef RACCT 3908 void 3909 prison_racct_foreach(void (*callback)(struct racct *racct, 3910 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 3911 void *arg2, void *arg3) 3912 { 3913 struct prison_racct *prr; 3914 3915 ASSERT_RACCT_ENABLED(); 3916 3917 sx_slock(&allprison_lock); 3918 if (pre != NULL) 3919 (pre)(); 3920 LIST_FOREACH(prr, &allprison_racct, prr_next) 3921 (callback)(prr->prr_racct, arg2, arg3); 3922 if (post != NULL) 3923 (post)(); 3924 sx_sunlock(&allprison_lock); 3925 } 3926 3927 static struct prison_racct * 3928 prison_racct_find_locked(const char *name) 3929 { 3930 struct prison_racct *prr; 3931 3932 ASSERT_RACCT_ENABLED(); 3933 sx_assert(&allprison_lock, SA_XLOCKED); 3934 3935 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 3936 return (NULL); 3937 3938 LIST_FOREACH(prr, &allprison_racct, prr_next) { 3939 if (strcmp(name, prr->prr_name) != 0) 3940 continue; 3941 3942 /* Found prison_racct with a matching name? */ 3943 prison_racct_hold(prr); 3944 return (prr); 3945 } 3946 3947 /* Add new prison_racct. */ 3948 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 3949 racct_create(&prr->prr_racct); 3950 3951 strcpy(prr->prr_name, name); 3952 refcount_init(&prr->prr_refcount, 1); 3953 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 3954 3955 return (prr); 3956 } 3957 3958 struct prison_racct * 3959 prison_racct_find(const char *name) 3960 { 3961 struct prison_racct *prr; 3962 3963 ASSERT_RACCT_ENABLED(); 3964 3965 sx_xlock(&allprison_lock); 3966 prr = prison_racct_find_locked(name); 3967 sx_xunlock(&allprison_lock); 3968 return (prr); 3969 } 3970 3971 void 3972 prison_racct_hold(struct prison_racct *prr) 3973 { 3974 3975 ASSERT_RACCT_ENABLED(); 3976 3977 refcount_acquire(&prr->prr_refcount); 3978 } 3979 3980 static void 3981 prison_racct_free_locked(struct prison_racct *prr) 3982 { 3983 3984 ASSERT_RACCT_ENABLED(); 3985 sx_assert(&allprison_lock, SA_XLOCKED); 3986 3987 if (refcount_release(&prr->prr_refcount)) { 3988 racct_destroy(&prr->prr_racct); 3989 LIST_REMOVE(prr, prr_next); 3990 free(prr, M_PRISON_RACCT); 3991 } 3992 } 3993 3994 void 3995 prison_racct_free(struct prison_racct *prr) 3996 { 3997 int old; 3998 3999 ASSERT_RACCT_ENABLED(); 4000 sx_assert(&allprison_lock, SA_UNLOCKED); 4001 4002 old = prr->prr_refcount; 4003 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4004 return; 4005 4006 sx_xlock(&allprison_lock); 4007 prison_racct_free_locked(prr); 4008 sx_xunlock(&allprison_lock); 4009 } 4010 4011 static void 4012 prison_racct_attach(struct prison *pr) 4013 { 4014 struct prison_racct *prr; 4015 4016 ASSERT_RACCT_ENABLED(); 4017 sx_assert(&allprison_lock, SA_XLOCKED); 4018 4019 prr = prison_racct_find_locked(pr->pr_name); 4020 KASSERT(prr != NULL, ("cannot find prison_racct")); 4021 4022 pr->pr_prison_racct = prr; 4023 } 4024 4025 /* 4026 * Handle jail renaming. From the racct point of view, renaming means 4027 * moving from one prison_racct to another. 4028 */ 4029 static void 4030 prison_racct_modify(struct prison *pr) 4031 { 4032 #ifdef RCTL 4033 struct proc *p; 4034 struct ucred *cred; 4035 #endif 4036 struct prison_racct *oldprr; 4037 4038 ASSERT_RACCT_ENABLED(); 4039 4040 sx_slock(&allproc_lock); 4041 sx_xlock(&allprison_lock); 4042 4043 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4044 sx_xunlock(&allprison_lock); 4045 sx_sunlock(&allproc_lock); 4046 return; 4047 } 4048 4049 oldprr = pr->pr_prison_racct; 4050 pr->pr_prison_racct = NULL; 4051 4052 prison_racct_attach(pr); 4053 4054 /* 4055 * Move resource utilisation records. 4056 */ 4057 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4058 4059 #ifdef RCTL 4060 /* 4061 * Force rctl to reattach rules to processes. 4062 */ 4063 FOREACH_PROC_IN_SYSTEM(p) { 4064 PROC_LOCK(p); 4065 cred = crhold(p->p_ucred); 4066 PROC_UNLOCK(p); 4067 rctl_proc_ucred_changed(p, cred); 4068 crfree(cred); 4069 } 4070 #endif 4071 4072 sx_sunlock(&allproc_lock); 4073 prison_racct_free_locked(oldprr); 4074 sx_xunlock(&allprison_lock); 4075 } 4076 4077 static void 4078 prison_racct_detach(struct prison *pr) 4079 { 4080 4081 ASSERT_RACCT_ENABLED(); 4082 sx_assert(&allprison_lock, SA_UNLOCKED); 4083 4084 if (pr->pr_prison_racct == NULL) 4085 return; 4086 prison_racct_free(pr->pr_prison_racct); 4087 pr->pr_prison_racct = NULL; 4088 } 4089 #endif /* RACCT */ 4090 4091 #ifdef DDB 4092 4093 static void 4094 db_show_prison(struct prison *pr) 4095 { 4096 struct bool_flags *bf; 4097 struct jailsys_flags *jsf; 4098 #if defined(INET) || defined(INET6) 4099 int ii; 4100 #endif 4101 unsigned f; 4102 #ifdef INET 4103 char ip4buf[INET_ADDRSTRLEN]; 4104 #endif 4105 #ifdef INET6 4106 char ip6buf[INET6_ADDRSTRLEN]; 4107 #endif 4108 4109 db_printf("prison %p:\n", pr); 4110 db_printf(" jid = %d\n", pr->pr_id); 4111 db_printf(" name = %s\n", pr->pr_name); 4112 db_printf(" parent = %p\n", pr->pr_parent); 4113 db_printf(" ref = %d\n", pr->pr_ref); 4114 db_printf(" uref = %d\n", pr->pr_uref); 4115 db_printf(" path = %s\n", pr->pr_path); 4116 db_printf(" cpuset = %d\n", pr->pr_cpuset 4117 ? pr->pr_cpuset->cs_id : -1); 4118 #ifdef VIMAGE 4119 db_printf(" vnet = %p\n", pr->pr_vnet); 4120 #endif 4121 db_printf(" root = %p\n", pr->pr_root); 4122 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4123 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4124 db_printf(" children.max = %d\n", pr->pr_childmax); 4125 db_printf(" children.cur = %d\n", pr->pr_childcount); 4126 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4127 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4128 db_printf(" flags = 0x%x", pr->pr_flags); 4129 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++) 4130 if (pr->pr_flags & bf->flag) 4131 db_printf(" %s", bf->name); 4132 for (jsf = pr_flag_jailsys; 4133 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 4134 jsf++) { 4135 f = pr->pr_flags & (jsf->disable | jsf->new); 4136 db_printf(" %-16s= %s\n", jsf->name, 4137 (f != 0 && f == jsf->disable) ? "disable" 4138 : (f == jsf->new) ? "new" 4139 : "inherit"); 4140 } 4141 db_printf(" allow = 0x%x", pr->pr_allow); 4142 for (bf = pr_flag_allow; 4143 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 4144 bf++) 4145 if (pr->pr_allow & bf->flag) 4146 db_printf(" %s", bf->name); 4147 db_printf("\n"); 4148 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4149 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4150 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4151 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4152 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4153 #ifdef INET 4154 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4155 for (ii = 0; ii < pr->pr_ip4s; ii++) 4156 db_printf(" %s %s\n", 4157 ii == 0 ? "ip4.addr =" : " ", 4158 inet_ntoa_r(pr->pr_ip4[ii], ip4buf)); 4159 #endif 4160 #ifdef INET6 4161 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4162 for (ii = 0; ii < pr->pr_ip6s; ii++) 4163 db_printf(" %s %s\n", 4164 ii == 0 ? "ip6.addr =" : " ", 4165 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4166 #endif 4167 } 4168 4169 DB_SHOW_COMMAND(prison, db_show_prison_command) 4170 { 4171 struct prison *pr; 4172 4173 if (!have_addr) { 4174 /* 4175 * Show all prisons in the list, and prison0 which is not 4176 * listed. 4177 */ 4178 db_show_prison(&prison0); 4179 if (!db_pager_quit) { 4180 TAILQ_FOREACH(pr, &allprison, pr_list) { 4181 db_show_prison(pr); 4182 if (db_pager_quit) 4183 break; 4184 } 4185 } 4186 return; 4187 } 4188 4189 if (addr == 0) 4190 pr = &prison0; 4191 else { 4192 /* Look for a prison with the ID and with references. */ 4193 TAILQ_FOREACH(pr, &allprison, pr_list) 4194 if (pr->pr_id == addr && pr->pr_ref > 0) 4195 break; 4196 if (pr == NULL) 4197 /* Look again, without requiring a reference. */ 4198 TAILQ_FOREACH(pr, &allprison, pr_list) 4199 if (pr->pr_id == addr) 4200 break; 4201 if (pr == NULL) 4202 /* Assume address points to a valid prison. */ 4203 pr = (struct prison *)addr; 4204 } 4205 db_show_prison(pr); 4206 } 4207 4208 #endif /* DDB */ 4209