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