1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1999 Poul-Henning Kamp. 5 * Copyright (c) 2008 Bjoern A. Zeeb. 6 * Copyright (c) 2009 James Gritton. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include "opt_ddb.h" 35 #include "opt_inet.h" 36 #include "opt_inet6.h" 37 38 #include <sys/param.h> 39 #include <sys/types.h> 40 #include <sys/kernel.h> 41 #include <sys/systm.h> 42 #include <sys/errno.h> 43 #include <sys/sysproto.h> 44 #include <sys/malloc.h> 45 #include <sys/osd.h> 46 #include <sys/priv.h> 47 #include <sys/proc.h> 48 #include <sys/taskqueue.h> 49 #include <sys/fcntl.h> 50 #include <sys/jail.h> 51 #include <sys/lock.h> 52 #include <sys/mutex.h> 53 #include <sys/racct.h> 54 #include <sys/rctl.h> 55 #include <sys/refcount.h> 56 #include <sys/sx.h> 57 #include <sys/sysent.h> 58 #include <sys/namei.h> 59 #include <sys/mount.h> 60 #include <sys/queue.h> 61 #include <sys/socket.h> 62 #include <sys/syscallsubr.h> 63 #include <sys/sysctl.h> 64 #include <sys/vnode.h> 65 66 #include <net/if.h> 67 #include <net/vnet.h> 68 69 #include <netinet/in.h> 70 71 #ifdef DDB 72 #include <ddb/ddb.h> 73 #endif /* DDB */ 74 75 #include <security/mac/mac_framework.h> 76 77 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 78 79 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 80 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 81 82 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 83 #ifdef INET 84 #ifdef INET6 85 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 86 #else 87 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 88 #endif 89 #else /* !INET */ 90 #ifdef INET6 91 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 92 #else 93 #define _PR_IP_SADDRSEL 0 94 #endif 95 #endif 96 97 /* prison0 describes what is "real" about the system. */ 98 struct prison prison0 = { 99 .pr_id = 0, 100 .pr_name = "0", 101 .pr_ref = 1, 102 .pr_uref = 1, 103 .pr_path = "/", 104 .pr_securelevel = -1, 105 .pr_devfs_rsnum = 0, 106 .pr_childmax = JAIL_MAX, 107 .pr_hostuuid = DEFAULT_HOSTUUID, 108 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 109 #ifdef VIMAGE 110 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 111 #else 112 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 113 #endif 114 .pr_allow = PR_ALLOW_ALL_STATIC, 115 }; 116 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 117 118 struct bool_flags { 119 const char *name; 120 const char *noname; 121 unsigned flag; 122 }; 123 struct jailsys_flags { 124 const char *name; 125 unsigned disable; 126 unsigned new; 127 }; 128 129 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 130 struct sx allprison_lock; 131 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 132 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 133 LIST_HEAD(, prison_racct) allprison_racct; 134 int lastprid = 0; 135 136 static int do_jail_attach(struct thread *td, struct prison *pr); 137 static void prison_complete(void *context, int pending); 138 static void prison_deref(struct prison *pr, int flags); 139 static char *prison_path(struct prison *pr1, struct prison *pr2); 140 static void prison_remove_one(struct prison *pr); 141 #ifdef RACCT 142 static void prison_racct_attach(struct prison *pr); 143 static void prison_racct_modify(struct prison *pr); 144 static void prison_racct_detach(struct prison *pr); 145 #endif 146 147 /* Flags for prison_deref */ 148 #define PD_DEREF 0x01 149 #define PD_DEUREF 0x02 150 #define PD_LOCKED 0x04 151 #define PD_LIST_SLOCKED 0x08 152 #define PD_LIST_XLOCKED 0x10 153 154 /* 155 * Parameter names corresponding to PR_* flag values. Size values are for kvm 156 * as we cannot figure out the size of a sparse array, or an array without a 157 * terminating entry. 158 */ 159 static struct bool_flags pr_flag_bool[] = { 160 {"persist", "nopersist", PR_PERSIST}, 161 #ifdef INET 162 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL}, 163 #endif 164 #ifdef INET6 165 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL}, 166 #endif 167 }; 168 const size_t pr_flag_bool_size = sizeof(pr_flag_bool); 169 170 static struct jailsys_flags pr_flag_jailsys[] = { 171 {"host", 0, PR_HOST}, 172 #ifdef VIMAGE 173 {"vnet", 0, PR_VNET}, 174 #endif 175 #ifdef INET 176 {"ip4", PR_IP4_USER, PR_IP4_USER}, 177 #endif 178 #ifdef INET6 179 {"ip6", PR_IP6_USER, PR_IP6_USER}, 180 #endif 181 }; 182 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 183 184 /* Make this array full-size so dynamic parameters can be added. */ 185 static struct bool_flags pr_flag_allow[NBBY * NBPW] = { 186 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME}, 187 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC}, 188 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS}, 189 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS}, 190 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT}, 191 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS}, 192 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF}, 193 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK}, 194 {"allow.reserved_ports", "allow.noreserved_ports", 195 PR_ALLOW_RESERVED_PORTS}, 196 {"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF}, 197 {"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug", 198 PR_ALLOW_UNPRIV_DEBUG}, 199 }; 200 const size_t pr_flag_allow_size = sizeof(pr_flag_allow); 201 202 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \ 203 PR_ALLOW_RESERVED_PORTS | \ 204 PR_ALLOW_UNPRIV_DEBUG) 205 #define JAIL_DEFAULT_ENFORCE_STATFS 2 206 #define JAIL_DEFAULT_DEVFS_RSNUM 0 207 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 208 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 209 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 210 #if defined(INET) || defined(INET6) 211 static unsigned jail_max_af_ips = 255; 212 #endif 213 214 /* 215 * Initialize the parts of prison0 that can't be static-initialized with 216 * constants. This is called from proc0_init() after creating thread0 cpuset. 217 */ 218 void 219 prison0_init(void) 220 { 221 222 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 223 prison0.pr_osreldate = osreldate; 224 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 225 } 226 227 /* 228 * struct jail_args { 229 * struct jail *jail; 230 * }; 231 */ 232 int 233 sys_jail(struct thread *td, struct jail_args *uap) 234 { 235 uint32_t version; 236 int error; 237 struct jail j; 238 239 error = copyin(uap->jail, &version, sizeof(uint32_t)); 240 if (error) 241 return (error); 242 243 switch (version) { 244 case 0: 245 { 246 struct jail_v0 j0; 247 248 /* FreeBSD single IPv4 jails. */ 249 bzero(&j, sizeof(struct jail)); 250 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 251 if (error) 252 return (error); 253 j.version = j0.version; 254 j.path = j0.path; 255 j.hostname = j0.hostname; 256 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 257 break; 258 } 259 260 case 1: 261 /* 262 * Version 1 was used by multi-IPv4 jail implementations 263 * that never made it into the official kernel. 264 */ 265 return (EINVAL); 266 267 case 2: /* JAIL_API_VERSION */ 268 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 269 error = copyin(uap->jail, &j, sizeof(struct jail)); 270 if (error) 271 return (error); 272 break; 273 274 default: 275 /* Sci-Fi jails are not supported, sorry. */ 276 return (EINVAL); 277 } 278 return (kern_jail(td, &j)); 279 } 280 281 int 282 kern_jail(struct thread *td, struct jail *j) 283 { 284 struct iovec optiov[2 * (4 + nitems(pr_flag_allow) 285 #ifdef INET 286 + 1 287 #endif 288 #ifdef INET6 289 + 1 290 #endif 291 )]; 292 struct uio opt; 293 char *u_path, *u_hostname, *u_name; 294 struct bool_flags *bf; 295 #ifdef INET 296 uint32_t ip4s; 297 struct in_addr *u_ip4; 298 #endif 299 #ifdef INET6 300 struct in6_addr *u_ip6; 301 #endif 302 size_t tmplen; 303 int error, enforce_statfs; 304 305 bzero(&optiov, sizeof(optiov)); 306 opt.uio_iov = optiov; 307 opt.uio_iovcnt = 0; 308 opt.uio_offset = -1; 309 opt.uio_resid = -1; 310 opt.uio_segflg = UIO_SYSSPACE; 311 opt.uio_rw = UIO_READ; 312 opt.uio_td = td; 313 314 /* Set permissions for top-level jails from sysctls. */ 315 if (!jailed(td->td_ucred)) { 316 for (bf = pr_flag_allow; 317 bf < pr_flag_allow + nitems(pr_flag_allow) && 318 bf->flag != 0; 319 bf++) { 320 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *, 321 (jail_default_allow & bf->flag) 322 ? bf->name : bf->noname); 323 optiov[opt.uio_iovcnt].iov_len = 324 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 325 opt.uio_iovcnt += 2; 326 } 327 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 328 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 329 opt.uio_iovcnt++; 330 enforce_statfs = jail_default_enforce_statfs; 331 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 332 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 333 opt.uio_iovcnt++; 334 } 335 336 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 337 #ifdef INET 338 ip4s = (j->version == 0) ? 1 : j->ip4s; 339 if (ip4s > jail_max_af_ips) 340 return (EINVAL); 341 tmplen += ip4s * sizeof(struct in_addr); 342 #else 343 if (j->ip4s > 0) 344 return (EINVAL); 345 #endif 346 #ifdef INET6 347 if (j->ip6s > jail_max_af_ips) 348 return (EINVAL); 349 tmplen += j->ip6s * sizeof(struct in6_addr); 350 #else 351 if (j->ip6s > 0) 352 return (EINVAL); 353 #endif 354 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 355 u_hostname = u_path + MAXPATHLEN; 356 u_name = u_hostname + MAXHOSTNAMELEN; 357 #ifdef INET 358 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 359 #endif 360 #ifdef INET6 361 #ifdef INET 362 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 363 #else 364 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 365 #endif 366 #endif 367 optiov[opt.uio_iovcnt].iov_base = "path"; 368 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 369 opt.uio_iovcnt++; 370 optiov[opt.uio_iovcnt].iov_base = u_path; 371 error = copyinstr(j->path, u_path, MAXPATHLEN, 372 &optiov[opt.uio_iovcnt].iov_len); 373 if (error) { 374 free(u_path, M_TEMP); 375 return (error); 376 } 377 opt.uio_iovcnt++; 378 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 379 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 380 opt.uio_iovcnt++; 381 optiov[opt.uio_iovcnt].iov_base = u_hostname; 382 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 383 &optiov[opt.uio_iovcnt].iov_len); 384 if (error) { 385 free(u_path, M_TEMP); 386 return (error); 387 } 388 opt.uio_iovcnt++; 389 if (j->jailname != NULL) { 390 optiov[opt.uio_iovcnt].iov_base = "name"; 391 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 392 opt.uio_iovcnt++; 393 optiov[opt.uio_iovcnt].iov_base = u_name; 394 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 395 &optiov[opt.uio_iovcnt].iov_len); 396 if (error) { 397 free(u_path, M_TEMP); 398 return (error); 399 } 400 opt.uio_iovcnt++; 401 } 402 #ifdef INET 403 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 404 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 405 opt.uio_iovcnt++; 406 optiov[opt.uio_iovcnt].iov_base = u_ip4; 407 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 408 if (j->version == 0) 409 u_ip4->s_addr = j->ip4s; 410 else { 411 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 412 if (error) { 413 free(u_path, M_TEMP); 414 return (error); 415 } 416 } 417 opt.uio_iovcnt++; 418 #endif 419 #ifdef INET6 420 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 421 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 422 opt.uio_iovcnt++; 423 optiov[opt.uio_iovcnt].iov_base = u_ip6; 424 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 425 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 426 if (error) { 427 free(u_path, M_TEMP); 428 return (error); 429 } 430 opt.uio_iovcnt++; 431 #endif 432 KASSERT(opt.uio_iovcnt <= nitems(optiov), 433 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 434 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 435 free(u_path, M_TEMP); 436 return (error); 437 } 438 439 440 /* 441 * struct jail_set_args { 442 * struct iovec *iovp; 443 * unsigned int iovcnt; 444 * int flags; 445 * }; 446 */ 447 int 448 sys_jail_set(struct thread *td, struct jail_set_args *uap) 449 { 450 struct uio *auio; 451 int error; 452 453 /* Check that we have an even number of iovecs. */ 454 if (uap->iovcnt & 1) 455 return (EINVAL); 456 457 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 458 if (error) 459 return (error); 460 error = kern_jail_set(td, auio, uap->flags); 461 free(auio, M_IOV); 462 return (error); 463 } 464 465 int 466 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 467 { 468 struct nameidata nd; 469 #ifdef INET 470 struct in_addr *ip4; 471 #endif 472 #ifdef INET6 473 struct in6_addr *ip6; 474 #endif 475 struct vfsopt *opt; 476 struct vfsoptlist *opts; 477 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 478 struct vnode *root; 479 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 480 char *g_path, *osrelstr; 481 struct bool_flags *bf; 482 struct jailsys_flags *jsf; 483 #if defined(INET) || defined(INET6) 484 struct prison *tppr; 485 void *op; 486 #endif 487 unsigned long hid; 488 size_t namelen, onamelen, pnamelen; 489 int born, created, cuflags, descend, enforce; 490 int error, errmsg_len, errmsg_pos; 491 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 492 int jid, jsys, len, level; 493 int childmax, osreldt, rsnum, slevel; 494 int fullpath_disabled; 495 #if defined(INET) || defined(INET6) 496 int ii, ij; 497 #endif 498 #ifdef INET 499 int ip4s, redo_ip4; 500 #endif 501 #ifdef INET6 502 int ip6s, redo_ip6; 503 #endif 504 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 505 uint64_t pr_allow_diff; 506 unsigned tallow; 507 char numbuf[12]; 508 509 error = priv_check(td, PRIV_JAIL_SET); 510 if (!error && (flags & JAIL_ATTACH)) 511 error = priv_check(td, PRIV_JAIL_ATTACH); 512 if (error) 513 return (error); 514 mypr = td->td_ucred->cr_prison; 515 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 516 return (EPERM); 517 if (flags & ~JAIL_SET_MASK) 518 return (EINVAL); 519 520 /* 521 * Check all the parameters before committing to anything. Not all 522 * errors can be caught early, but we may as well try. Also, this 523 * takes care of some expensive stuff (path lookup) before getting 524 * the allprison lock. 525 * 526 * XXX Jails are not filesystems, and jail parameters are not mount 527 * options. But it makes more sense to re-use the vfsopt code 528 * than duplicate it under a different name. 529 */ 530 error = vfs_buildopts(optuio, &opts); 531 if (error) 532 return (error); 533 #ifdef INET 534 ip4 = NULL; 535 #endif 536 #ifdef INET6 537 ip6 = NULL; 538 #endif 539 g_path = NULL; 540 541 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 542 if (!cuflags) { 543 error = EINVAL; 544 vfs_opterror(opts, "no valid operation (create or update)"); 545 goto done_errmsg; 546 } 547 548 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 549 if (error == ENOENT) 550 jid = 0; 551 else if (error != 0) 552 goto done_free; 553 554 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 555 if (error == ENOENT) 556 gotslevel = 0; 557 else if (error != 0) 558 goto done_free; 559 else 560 gotslevel = 1; 561 562 error = 563 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 564 if (error == ENOENT) 565 gotchildmax = 0; 566 else if (error != 0) 567 goto done_free; 568 else 569 gotchildmax = 1; 570 571 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 572 if (error == ENOENT) 573 gotenforce = 0; 574 else if (error != 0) 575 goto done_free; 576 else if (enforce < 0 || enforce > 2) { 577 error = EINVAL; 578 goto done_free; 579 } else 580 gotenforce = 1; 581 582 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 583 if (error == ENOENT) 584 gotrsnum = 0; 585 else if (error != 0) 586 goto done_free; 587 else 588 gotrsnum = 1; 589 590 pr_flags = ch_flags = 0; 591 for (bf = pr_flag_bool; 592 bf < pr_flag_bool + nitems(pr_flag_bool); 593 bf++) { 594 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag); 595 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag); 596 } 597 ch_flags |= pr_flags; 598 for (jsf = pr_flag_jailsys; 599 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 600 jsf++) { 601 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys)); 602 if (error == ENOENT) 603 continue; 604 if (error != 0) 605 goto done_free; 606 switch (jsys) { 607 case JAIL_SYS_DISABLE: 608 if (!jsf->disable) { 609 error = EINVAL; 610 goto done_free; 611 } 612 pr_flags |= jsf->disable; 613 break; 614 case JAIL_SYS_NEW: 615 pr_flags |= jsf->new; 616 break; 617 case JAIL_SYS_INHERIT: 618 break; 619 default: 620 error = EINVAL; 621 goto done_free; 622 } 623 ch_flags |= jsf->new | jsf->disable; 624 } 625 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 626 && !(pr_flags & PR_PERSIST)) { 627 error = EINVAL; 628 vfs_opterror(opts, "new jail must persist or attach"); 629 goto done_errmsg; 630 } 631 #ifdef VIMAGE 632 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 633 error = EINVAL; 634 vfs_opterror(opts, "vnet cannot be changed after creation"); 635 goto done_errmsg; 636 } 637 #endif 638 #ifdef INET 639 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 640 error = EINVAL; 641 vfs_opterror(opts, "ip4 cannot be changed after creation"); 642 goto done_errmsg; 643 } 644 #endif 645 #ifdef INET6 646 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 647 error = EINVAL; 648 vfs_opterror(opts, "ip6 cannot be changed after creation"); 649 goto done_errmsg; 650 } 651 #endif 652 653 pr_allow = ch_allow = 0; 654 for (bf = pr_flag_allow; 655 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 656 bf++) { 657 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag); 658 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag); 659 } 660 ch_allow |= pr_allow; 661 662 error = vfs_getopt(opts, "name", (void **)&name, &len); 663 if (error == ENOENT) 664 name = NULL; 665 else if (error != 0) 666 goto done_free; 667 else { 668 if (len == 0 || name[len - 1] != '\0') { 669 error = EINVAL; 670 goto done_free; 671 } 672 if (len > MAXHOSTNAMELEN) { 673 error = ENAMETOOLONG; 674 goto done_free; 675 } 676 } 677 678 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 679 if (error == ENOENT) 680 host = NULL; 681 else if (error != 0) 682 goto done_free; 683 else { 684 ch_flags |= PR_HOST; 685 pr_flags |= PR_HOST; 686 if (len == 0 || host[len - 1] != '\0') { 687 error = EINVAL; 688 goto done_free; 689 } 690 if (len > MAXHOSTNAMELEN) { 691 error = ENAMETOOLONG; 692 goto done_free; 693 } 694 } 695 696 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 697 if (error == ENOENT) 698 domain = NULL; 699 else if (error != 0) 700 goto done_free; 701 else { 702 ch_flags |= PR_HOST; 703 pr_flags |= PR_HOST; 704 if (len == 0 || domain[len - 1] != '\0') { 705 error = EINVAL; 706 goto done_free; 707 } 708 if (len > MAXHOSTNAMELEN) { 709 error = ENAMETOOLONG; 710 goto done_free; 711 } 712 } 713 714 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 715 if (error == ENOENT) 716 uuid = NULL; 717 else if (error != 0) 718 goto done_free; 719 else { 720 ch_flags |= PR_HOST; 721 pr_flags |= PR_HOST; 722 if (len == 0 || uuid[len - 1] != '\0') { 723 error = EINVAL; 724 goto done_free; 725 } 726 if (len > HOSTUUIDLEN) { 727 error = ENAMETOOLONG; 728 goto done_free; 729 } 730 } 731 732 #ifdef COMPAT_FREEBSD32 733 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 734 uint32_t hid32; 735 736 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 737 hid = hid32; 738 } else 739 #endif 740 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 741 if (error == ENOENT) 742 gothid = 0; 743 else if (error != 0) 744 goto done_free; 745 else { 746 gothid = 1; 747 ch_flags |= PR_HOST; 748 pr_flags |= PR_HOST; 749 } 750 751 #ifdef INET 752 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 753 if (error == ENOENT) 754 ip4s = 0; 755 else if (error != 0) 756 goto done_free; 757 else if (ip4s & (sizeof(*ip4) - 1)) { 758 error = EINVAL; 759 goto done_free; 760 } else { 761 ch_flags |= PR_IP4_USER; 762 pr_flags |= PR_IP4_USER; 763 if (ip4s > 0) { 764 ip4s /= sizeof(*ip4); 765 if (ip4s > jail_max_af_ips) { 766 error = EINVAL; 767 vfs_opterror(opts, "too many IPv4 addresses"); 768 goto done_errmsg; 769 } 770 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 771 bcopy(op, ip4, ip4s * sizeof(*ip4)); 772 /* 773 * IP addresses are all sorted but ip[0] to preserve 774 * the primary IP address as given from userland. 775 * This special IP is used for unbound outgoing 776 * connections as well for "loopback" traffic in case 777 * source address selection cannot find any more fitting 778 * address to connect from. 779 */ 780 if (ip4s > 1) 781 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), 782 prison_qcmp_v4); 783 /* 784 * Check for duplicate addresses and do some simple 785 * zero and broadcast checks. If users give other bogus 786 * addresses it is their problem. 787 * 788 * We do not have to care about byte order for these 789 * checks so we will do them in NBO. 790 */ 791 for (ii = 0; ii < ip4s; ii++) { 792 if (ip4[ii].s_addr == INADDR_ANY || 793 ip4[ii].s_addr == INADDR_BROADCAST) { 794 error = EINVAL; 795 goto done_free; 796 } 797 if ((ii+1) < ip4s && 798 (ip4[0].s_addr == ip4[ii+1].s_addr || 799 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 800 error = EINVAL; 801 goto done_free; 802 } 803 } 804 } 805 } 806 #endif 807 808 #ifdef INET6 809 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 810 if (error == ENOENT) 811 ip6s = 0; 812 else if (error != 0) 813 goto done_free; 814 else if (ip6s & (sizeof(*ip6) - 1)) { 815 error = EINVAL; 816 goto done_free; 817 } else { 818 ch_flags |= PR_IP6_USER; 819 pr_flags |= PR_IP6_USER; 820 if (ip6s > 0) { 821 ip6s /= sizeof(*ip6); 822 if (ip6s > jail_max_af_ips) { 823 error = EINVAL; 824 vfs_opterror(opts, "too many IPv6 addresses"); 825 goto done_errmsg; 826 } 827 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 828 bcopy(op, ip6, ip6s * sizeof(*ip6)); 829 if (ip6s > 1) 830 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), 831 prison_qcmp_v6); 832 for (ii = 0; ii < ip6s; ii++) { 833 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 834 error = EINVAL; 835 goto done_free; 836 } 837 if ((ii+1) < ip6s && 838 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 839 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 840 { 841 error = EINVAL; 842 goto done_free; 843 } 844 } 845 } 846 } 847 #endif 848 849 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 850 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 851 error = EINVAL; 852 vfs_opterror(opts, 853 "vnet jails cannot have IP address restrictions"); 854 goto done_errmsg; 855 } 856 #endif 857 858 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 859 if (error == ENOENT) 860 osrelstr = NULL; 861 else if (error != 0) 862 goto done_free; 863 else { 864 if (flags & JAIL_UPDATE) { 865 error = EINVAL; 866 vfs_opterror(opts, 867 "osrelease cannot be changed after creation"); 868 goto done_errmsg; 869 } 870 if (len == 0 || len >= OSRELEASELEN) { 871 error = EINVAL; 872 vfs_opterror(opts, 873 "osrelease string must be 1-%d bytes long", 874 OSRELEASELEN - 1); 875 goto done_errmsg; 876 } 877 } 878 879 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 880 if (error == ENOENT) 881 osreldt = 0; 882 else if (error != 0) 883 goto done_free; 884 else { 885 if (flags & JAIL_UPDATE) { 886 error = EINVAL; 887 vfs_opterror(opts, 888 "osreldate cannot be changed after creation"); 889 goto done_errmsg; 890 } 891 if (osreldt == 0) { 892 error = EINVAL; 893 vfs_opterror(opts, "osreldate cannot be 0"); 894 goto done_errmsg; 895 } 896 } 897 898 fullpath_disabled = 0; 899 root = NULL; 900 error = vfs_getopt(opts, "path", (void **)&path, &len); 901 if (error == ENOENT) 902 path = NULL; 903 else if (error != 0) 904 goto done_free; 905 else { 906 if (flags & JAIL_UPDATE) { 907 error = EINVAL; 908 vfs_opterror(opts, 909 "path cannot be changed after creation"); 910 goto done_errmsg; 911 } 912 if (len == 0 || path[len - 1] != '\0') { 913 error = EINVAL; 914 goto done_free; 915 } 916 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 917 path, td); 918 error = namei(&nd); 919 if (error) 920 goto done_free; 921 root = nd.ni_vp; 922 NDFREE(&nd, NDF_ONLY_PNBUF); 923 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 924 strlcpy(g_path, path, MAXPATHLEN); 925 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 926 if (error == 0) 927 path = g_path; 928 else if (error == ENODEV) { 929 /* proceed if sysctl debug.disablefullpath == 1 */ 930 fullpath_disabled = 1; 931 if (len < 2 || (len == 2 && path[0] == '/')) 932 path = NULL; 933 } else { 934 /* exit on other errors */ 935 goto done_free; 936 } 937 if (root->v_type != VDIR) { 938 error = ENOTDIR; 939 vput(root); 940 goto done_free; 941 } 942 VOP_UNLOCK(root, 0); 943 if (fullpath_disabled) { 944 /* Leave room for a real-root full pathname. */ 945 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 946 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 947 error = ENAMETOOLONG; 948 vrele(root); 949 goto done_free; 950 } 951 } 952 } 953 954 /* 955 * Find the specified jail, or at least its parent. 956 * This abuses the file error codes ENOENT and EEXIST. 957 */ 958 pr = NULL; 959 ppr = mypr; 960 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 961 namelc = strrchr(name, '.'); 962 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 963 if (*p != '\0') 964 jid = 0; 965 } 966 sx_xlock(&allprison_lock); 967 if (jid != 0) { 968 /* 969 * See if a requested jid already exists. There is an 970 * information leak here if the jid exists but is not within 971 * the caller's jail hierarchy. Jail creators will get EEXIST 972 * even though they cannot see the jail, and CREATE | UPDATE 973 * will return ENOENT which is not normally a valid error. 974 */ 975 if (jid < 0) { 976 error = EINVAL; 977 vfs_opterror(opts, "negative jid"); 978 goto done_unlock_list; 979 } 980 pr = prison_find(jid); 981 if (pr != NULL) { 982 ppr = pr->pr_parent; 983 /* Create: jid must not exist. */ 984 if (cuflags == JAIL_CREATE) { 985 mtx_unlock(&pr->pr_mtx); 986 error = EEXIST; 987 vfs_opterror(opts, "jail %d already exists", 988 jid); 989 goto done_unlock_list; 990 } 991 if (!prison_ischild(mypr, pr)) { 992 mtx_unlock(&pr->pr_mtx); 993 pr = NULL; 994 } else if (pr->pr_uref == 0) { 995 if (!(flags & JAIL_DYING)) { 996 mtx_unlock(&pr->pr_mtx); 997 error = ENOENT; 998 vfs_opterror(opts, "jail %d is dying", 999 jid); 1000 goto done_unlock_list; 1001 } else if ((flags & JAIL_ATTACH) || 1002 (pr_flags & PR_PERSIST)) { 1003 /* 1004 * A dying jail might be resurrected 1005 * (via attach or persist), but first 1006 * it must determine if another jail 1007 * has claimed its name. Accomplish 1008 * this by implicitly re-setting the 1009 * name. 1010 */ 1011 if (name == NULL) 1012 name = prison_name(mypr, pr); 1013 } 1014 } 1015 } 1016 if (pr == NULL) { 1017 /* Update: jid must exist. */ 1018 if (cuflags == JAIL_UPDATE) { 1019 error = ENOENT; 1020 vfs_opterror(opts, "jail %d not found", jid); 1021 goto done_unlock_list; 1022 } 1023 } 1024 } 1025 /* 1026 * If the caller provided a name, look for a jail by that name. 1027 * This has different semantics for creates and updates keyed by jid 1028 * (where the name must not already exist in a different jail), 1029 * and updates keyed by the name itself (where the name must exist 1030 * because that is the jail being updated). 1031 */ 1032 namelc = NULL; 1033 if (name != NULL) { 1034 namelc = strrchr(name, '.'); 1035 if (namelc == NULL) 1036 namelc = name; 1037 else { 1038 /* 1039 * This is a hierarchical name. Split it into the 1040 * parent and child names, and make sure the parent 1041 * exists or matches an already found jail. 1042 */ 1043 if (pr != NULL) { 1044 if (strncmp(name, ppr->pr_name, namelc - name) 1045 || ppr->pr_name[namelc - name] != '\0') { 1046 mtx_unlock(&pr->pr_mtx); 1047 error = EINVAL; 1048 vfs_opterror(opts, 1049 "cannot change jail's parent"); 1050 goto done_unlock_list; 1051 } 1052 } else { 1053 *namelc = '\0'; 1054 ppr = prison_find_name(mypr, name); 1055 if (ppr == NULL) { 1056 error = ENOENT; 1057 vfs_opterror(opts, 1058 "jail \"%s\" not found", name); 1059 goto done_unlock_list; 1060 } 1061 mtx_unlock(&ppr->pr_mtx); 1062 *namelc = '.'; 1063 } 1064 namelc++; 1065 } 1066 if (namelc[0] != '\0') { 1067 pnamelen = 1068 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1069 name_again: 1070 deadpr = NULL; 1071 FOREACH_PRISON_CHILD(ppr, tpr) { 1072 if (tpr != pr && tpr->pr_ref > 0 && 1073 !strcmp(tpr->pr_name + pnamelen, namelc)) { 1074 if (pr == NULL && 1075 cuflags != JAIL_CREATE) { 1076 mtx_lock(&tpr->pr_mtx); 1077 if (tpr->pr_ref > 0) { 1078 /* 1079 * Use this jail 1080 * for updates. 1081 */ 1082 if (tpr->pr_uref > 0) { 1083 pr = tpr; 1084 break; 1085 } 1086 deadpr = tpr; 1087 } 1088 mtx_unlock(&tpr->pr_mtx); 1089 } else if (tpr->pr_uref > 0) { 1090 /* 1091 * Create, or update(jid): 1092 * name must not exist in an 1093 * active sibling jail. 1094 */ 1095 error = EEXIST; 1096 if (pr != NULL) 1097 mtx_unlock(&pr->pr_mtx); 1098 vfs_opterror(opts, 1099 "jail \"%s\" already exists", 1100 name); 1101 goto done_unlock_list; 1102 } 1103 } 1104 } 1105 /* If no active jail is found, use a dying one. */ 1106 if (deadpr != NULL && pr == NULL) { 1107 if (flags & JAIL_DYING) { 1108 mtx_lock(&deadpr->pr_mtx); 1109 if (deadpr->pr_ref == 0) { 1110 mtx_unlock(&deadpr->pr_mtx); 1111 goto name_again; 1112 } 1113 pr = deadpr; 1114 } else if (cuflags == JAIL_UPDATE) { 1115 error = ENOENT; 1116 vfs_opterror(opts, 1117 "jail \"%s\" is dying", name); 1118 goto done_unlock_list; 1119 } 1120 } 1121 /* Update: name must exist if no jid. */ 1122 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1123 error = ENOENT; 1124 vfs_opterror(opts, "jail \"%s\" not found", 1125 name); 1126 goto done_unlock_list; 1127 } 1128 } 1129 } 1130 /* Update: must provide a jid or name. */ 1131 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1132 error = ENOENT; 1133 vfs_opterror(opts, "update specified no jail"); 1134 goto done_unlock_list; 1135 } 1136 1137 /* If there's no prison to update, create a new one and link it in. */ 1138 if (pr == NULL) { 1139 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1140 if (tpr->pr_childcount >= tpr->pr_childmax) { 1141 error = EPERM; 1142 vfs_opterror(opts, "prison limit exceeded"); 1143 goto done_unlock_list; 1144 } 1145 created = 1; 1146 mtx_lock(&ppr->pr_mtx); 1147 if (ppr->pr_ref == 0) { 1148 mtx_unlock(&ppr->pr_mtx); 1149 error = ENOENT; 1150 vfs_opterror(opts, "jail \"%s\" not found", 1151 prison_name(mypr, ppr)); 1152 goto done_unlock_list; 1153 } 1154 ppr->pr_ref++; 1155 ppr->pr_uref++; 1156 mtx_unlock(&ppr->pr_mtx); 1157 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1158 if (jid == 0) { 1159 /* Find the next free jid. */ 1160 jid = lastprid + 1; 1161 findnext: 1162 if (jid == JAIL_MAX) 1163 jid = 1; 1164 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1165 if (tpr->pr_id < jid) 1166 continue; 1167 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1168 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1169 break; 1170 } 1171 if (jid == lastprid) { 1172 error = EAGAIN; 1173 vfs_opterror(opts, 1174 "no available jail IDs"); 1175 free(pr, M_PRISON); 1176 prison_deref(ppr, PD_DEREF | 1177 PD_DEUREF | PD_LIST_XLOCKED); 1178 goto done_releroot; 1179 } 1180 jid++; 1181 goto findnext; 1182 } 1183 lastprid = jid; 1184 } else { 1185 /* 1186 * The jail already has a jid (that did not yet exist), 1187 * so just find where to insert it. 1188 */ 1189 TAILQ_FOREACH(tpr, &allprison, pr_list) 1190 if (tpr->pr_id >= jid) { 1191 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1192 break; 1193 } 1194 } 1195 if (tpr == NULL) 1196 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1197 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1198 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1199 tpr->pr_childcount++; 1200 1201 pr->pr_parent = ppr; 1202 pr->pr_id = jid; 1203 1204 /* Set some default values, and inherit some from the parent. */ 1205 if (namelc == NULL) 1206 namelc = ""; 1207 if (path == NULL) { 1208 path = "/"; 1209 root = mypr->pr_root; 1210 vref(root); 1211 } 1212 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1213 pr->pr_flags |= PR_HOST; 1214 #if defined(INET) || defined(INET6) 1215 #ifdef VIMAGE 1216 if (!(pr_flags & PR_VNET)) 1217 #endif 1218 { 1219 #ifdef INET 1220 if (!(ch_flags & PR_IP4_USER)) 1221 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1222 else if (!(pr_flags & PR_IP4_USER)) { 1223 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1224 if (ppr->pr_ip4 != NULL) { 1225 pr->pr_ip4s = ppr->pr_ip4s; 1226 pr->pr_ip4 = malloc(pr->pr_ip4s * 1227 sizeof(struct in_addr), M_PRISON, 1228 M_WAITOK); 1229 bcopy(ppr->pr_ip4, pr->pr_ip4, 1230 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1231 } 1232 } 1233 #endif 1234 #ifdef INET6 1235 if (!(ch_flags & PR_IP6_USER)) 1236 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1237 else if (!(pr_flags & PR_IP6_USER)) { 1238 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1239 if (ppr->pr_ip6 != NULL) { 1240 pr->pr_ip6s = ppr->pr_ip6s; 1241 pr->pr_ip6 = malloc(pr->pr_ip6s * 1242 sizeof(struct in6_addr), M_PRISON, 1243 M_WAITOK); 1244 bcopy(ppr->pr_ip6, pr->pr_ip6, 1245 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1246 } 1247 } 1248 #endif 1249 } 1250 #endif 1251 /* Source address selection is always on by default. */ 1252 pr->pr_flags |= _PR_IP_SADDRSEL; 1253 1254 pr->pr_securelevel = ppr->pr_securelevel; 1255 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1256 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1257 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1258 1259 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1260 if (osrelstr == NULL) 1261 strcpy(pr->pr_osrelease, ppr->pr_osrelease); 1262 else 1263 strcpy(pr->pr_osrelease, osrelstr); 1264 1265 LIST_INIT(&pr->pr_children); 1266 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1267 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1268 1269 #ifdef VIMAGE 1270 /* Allocate a new vnet if specified. */ 1271 pr->pr_vnet = (pr_flags & PR_VNET) 1272 ? vnet_alloc() : ppr->pr_vnet; 1273 #endif 1274 /* 1275 * Allocate a dedicated cpuset for each jail. 1276 * Unlike other initial settings, this may return an erorr. 1277 */ 1278 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1279 if (error) { 1280 prison_deref(pr, PD_LIST_XLOCKED); 1281 goto done_releroot; 1282 } 1283 1284 mtx_lock(&pr->pr_mtx); 1285 /* 1286 * New prisons do not yet have a reference, because we do not 1287 * want others to see the incomplete prison once the 1288 * allprison_lock is downgraded. 1289 */ 1290 } else { 1291 created = 0; 1292 /* 1293 * Grab a reference for existing prisons, to ensure they 1294 * continue to exist for the duration of the call. 1295 */ 1296 pr->pr_ref++; 1297 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1298 if ((pr->pr_flags & PR_VNET) && 1299 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1300 error = EINVAL; 1301 vfs_opterror(opts, 1302 "vnet jails cannot have IP address restrictions"); 1303 goto done_deref_locked; 1304 } 1305 #endif 1306 #ifdef INET 1307 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1308 error = EINVAL; 1309 vfs_opterror(opts, 1310 "ip4 cannot be changed after creation"); 1311 goto done_deref_locked; 1312 } 1313 #endif 1314 #ifdef INET6 1315 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1316 error = EINVAL; 1317 vfs_opterror(opts, 1318 "ip6 cannot be changed after creation"); 1319 goto done_deref_locked; 1320 } 1321 #endif 1322 } 1323 1324 /* Do final error checking before setting anything. */ 1325 if (gotslevel) { 1326 if (slevel < ppr->pr_securelevel) { 1327 error = EPERM; 1328 goto done_deref_locked; 1329 } 1330 } 1331 if (gotchildmax) { 1332 if (childmax >= ppr->pr_childmax) { 1333 error = EPERM; 1334 goto done_deref_locked; 1335 } 1336 } 1337 if (gotenforce) { 1338 if (enforce < ppr->pr_enforce_statfs) { 1339 error = EPERM; 1340 goto done_deref_locked; 1341 } 1342 } 1343 if (gotrsnum) { 1344 /* 1345 * devfs_rsnum is a uint16_t 1346 */ 1347 if (rsnum < 0 || rsnum > 65535) { 1348 error = EINVAL; 1349 goto done_deref_locked; 1350 } 1351 /* 1352 * Nested jails always inherit parent's devfs ruleset 1353 */ 1354 if (jailed(td->td_ucred)) { 1355 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1356 error = EPERM; 1357 goto done_deref_locked; 1358 } else 1359 rsnum = ppr->pr_devfs_rsnum; 1360 } 1361 } 1362 #ifdef INET 1363 if (ip4s > 0) { 1364 if (ppr->pr_flags & PR_IP4) { 1365 /* 1366 * Make sure the new set of IP addresses is a 1367 * subset of the parent's list. Don't worry 1368 * about the parent being unlocked, as any 1369 * setting is done with allprison_lock held. 1370 */ 1371 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1372 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1373 break; 1374 if (ij == ppr->pr_ip4s) { 1375 error = EPERM; 1376 goto done_deref_locked; 1377 } 1378 if (ip4s > 1) { 1379 for (ii = ij = 1; ii < ip4s; ii++) { 1380 if (ip4[ii].s_addr == 1381 ppr->pr_ip4[0].s_addr) 1382 continue; 1383 for (; ij < ppr->pr_ip4s; ij++) 1384 if (ip4[ii].s_addr == 1385 ppr->pr_ip4[ij].s_addr) 1386 break; 1387 if (ij == ppr->pr_ip4s) 1388 break; 1389 } 1390 if (ij == ppr->pr_ip4s) { 1391 error = EPERM; 1392 goto done_deref_locked; 1393 } 1394 } 1395 } 1396 /* 1397 * Check for conflicting IP addresses. We permit them 1398 * if there is no more than one IP on each jail. If 1399 * there is a duplicate on a jail with more than one 1400 * IP stop checking and return error. 1401 */ 1402 #ifdef VIMAGE 1403 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1404 if (tppr->pr_flags & PR_VNET) 1405 break; 1406 #else 1407 tppr = &prison0; 1408 #endif 1409 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1410 if (tpr == pr || 1411 #ifdef VIMAGE 1412 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1413 #endif 1414 tpr->pr_uref == 0) { 1415 descend = 0; 1416 continue; 1417 } 1418 if (!(tpr->pr_flags & PR_IP4_USER)) 1419 continue; 1420 descend = 0; 1421 if (tpr->pr_ip4 == NULL || 1422 (ip4s == 1 && tpr->pr_ip4s == 1)) 1423 continue; 1424 for (ii = 0; ii < ip4s; ii++) { 1425 if (prison_check_ip4_locked(tpr, &ip4[ii]) == 1426 0) { 1427 error = EADDRINUSE; 1428 vfs_opterror(opts, 1429 "IPv4 addresses clash"); 1430 goto done_deref_locked; 1431 } 1432 } 1433 } 1434 } 1435 #endif 1436 #ifdef INET6 1437 if (ip6s > 0) { 1438 if (ppr->pr_flags & PR_IP6) { 1439 /* 1440 * Make sure the new set of IP addresses is a 1441 * subset of the parent's list. 1442 */ 1443 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1444 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1445 &ppr->pr_ip6[ij])) 1446 break; 1447 if (ij == ppr->pr_ip6s) { 1448 error = EPERM; 1449 goto done_deref_locked; 1450 } 1451 if (ip6s > 1) { 1452 for (ii = ij = 1; ii < ip6s; ii++) { 1453 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1454 &ppr->pr_ip6[0])) 1455 continue; 1456 for (; ij < ppr->pr_ip6s; ij++) 1457 if (IN6_ARE_ADDR_EQUAL( 1458 &ip6[ii], &ppr->pr_ip6[ij])) 1459 break; 1460 if (ij == ppr->pr_ip6s) 1461 break; 1462 } 1463 if (ij == ppr->pr_ip6s) { 1464 error = EPERM; 1465 goto done_deref_locked; 1466 } 1467 } 1468 } 1469 /* Check for conflicting IP addresses. */ 1470 #ifdef VIMAGE 1471 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1472 if (tppr->pr_flags & PR_VNET) 1473 break; 1474 #else 1475 tppr = &prison0; 1476 #endif 1477 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1478 if (tpr == pr || 1479 #ifdef VIMAGE 1480 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1481 #endif 1482 tpr->pr_uref == 0) { 1483 descend = 0; 1484 continue; 1485 } 1486 if (!(tpr->pr_flags & PR_IP6_USER)) 1487 continue; 1488 descend = 0; 1489 if (tpr->pr_ip6 == NULL || 1490 (ip6s == 1 && tpr->pr_ip6s == 1)) 1491 continue; 1492 for (ii = 0; ii < ip6s; ii++) { 1493 if (prison_check_ip6_locked(tpr, &ip6[ii]) == 1494 0) { 1495 error = EADDRINUSE; 1496 vfs_opterror(opts, 1497 "IPv6 addresses clash"); 1498 goto done_deref_locked; 1499 } 1500 } 1501 } 1502 } 1503 #endif 1504 onamelen = namelen = 0; 1505 if (namelc != NULL) { 1506 /* Give a default name of the jid. Also allow the name to be 1507 * explicitly the jid - but not any other number, and only in 1508 * normal form (no leading zero/etc). 1509 */ 1510 if (namelc[0] == '\0') 1511 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1512 else if ((strtoul(namelc, &p, 10) != jid || 1513 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1514 error = EINVAL; 1515 vfs_opterror(opts, 1516 "name cannot be numeric (unless it is the jid)"); 1517 goto done_deref_locked; 1518 } 1519 /* 1520 * Make sure the name isn't too long for the prison or its 1521 * children. 1522 */ 1523 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1524 onamelen = strlen(pr->pr_name + pnamelen); 1525 namelen = strlen(namelc); 1526 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1527 error = ENAMETOOLONG; 1528 goto done_deref_locked; 1529 } 1530 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1531 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1532 sizeof(pr->pr_name)) { 1533 error = ENAMETOOLONG; 1534 goto done_deref_locked; 1535 } 1536 } 1537 } 1538 pr_allow_diff = pr_allow & ~ppr->pr_allow; 1539 if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) { 1540 error = EPERM; 1541 goto done_deref_locked; 1542 } 1543 1544 /* 1545 * Let modules check their parameters. This requires unlocking and 1546 * then re-locking the prison, but this is still a valid state as long 1547 * as allprison_lock remains xlocked. 1548 */ 1549 mtx_unlock(&pr->pr_mtx); 1550 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1551 if (error != 0) { 1552 prison_deref(pr, created 1553 ? PD_LIST_XLOCKED 1554 : PD_DEREF | PD_LIST_XLOCKED); 1555 goto done_releroot; 1556 } 1557 mtx_lock(&pr->pr_mtx); 1558 1559 /* At this point, all valid parameters should have been noted. */ 1560 TAILQ_FOREACH(opt, opts, link) { 1561 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1562 error = EINVAL; 1563 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1564 goto done_deref_locked; 1565 } 1566 } 1567 1568 /* Set the parameters of the prison. */ 1569 #ifdef INET 1570 redo_ip4 = 0; 1571 if (pr_flags & PR_IP4_USER) { 1572 pr->pr_flags |= PR_IP4; 1573 free(pr->pr_ip4, M_PRISON); 1574 pr->pr_ip4s = ip4s; 1575 pr->pr_ip4 = ip4; 1576 ip4 = NULL; 1577 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1578 #ifdef VIMAGE 1579 if (tpr->pr_flags & PR_VNET) { 1580 descend = 0; 1581 continue; 1582 } 1583 #endif 1584 if (prison_restrict_ip4(tpr, NULL)) { 1585 redo_ip4 = 1; 1586 descend = 0; 1587 } 1588 } 1589 } 1590 #endif 1591 #ifdef INET6 1592 redo_ip6 = 0; 1593 if (pr_flags & PR_IP6_USER) { 1594 pr->pr_flags |= PR_IP6; 1595 free(pr->pr_ip6, M_PRISON); 1596 pr->pr_ip6s = ip6s; 1597 pr->pr_ip6 = ip6; 1598 ip6 = NULL; 1599 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1600 #ifdef VIMAGE 1601 if (tpr->pr_flags & PR_VNET) { 1602 descend = 0; 1603 continue; 1604 } 1605 #endif 1606 if (prison_restrict_ip6(tpr, NULL)) { 1607 redo_ip6 = 1; 1608 descend = 0; 1609 } 1610 } 1611 } 1612 #endif 1613 if (gotslevel) { 1614 pr->pr_securelevel = slevel; 1615 /* Set all child jails to be at least this level. */ 1616 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1617 if (tpr->pr_securelevel < slevel) 1618 tpr->pr_securelevel = slevel; 1619 } 1620 if (gotchildmax) { 1621 pr->pr_childmax = childmax; 1622 /* Set all child jails to under this limit. */ 1623 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1624 if (tpr->pr_childmax > childmax - level) 1625 tpr->pr_childmax = childmax > level 1626 ? childmax - level : 0; 1627 } 1628 if (gotenforce) { 1629 pr->pr_enforce_statfs = enforce; 1630 /* Pass this restriction on to the children. */ 1631 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1632 if (tpr->pr_enforce_statfs < enforce) 1633 tpr->pr_enforce_statfs = enforce; 1634 } 1635 if (gotrsnum) { 1636 pr->pr_devfs_rsnum = rsnum; 1637 /* Pass this restriction on to the children. */ 1638 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1639 tpr->pr_devfs_rsnum = rsnum; 1640 } 1641 if (namelc != NULL) { 1642 if (ppr == &prison0) 1643 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1644 else 1645 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1646 ppr->pr_name, namelc); 1647 /* Change this component of child names. */ 1648 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1649 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1650 strlen(tpr->pr_name + onamelen) + 1); 1651 bcopy(pr->pr_name, tpr->pr_name, namelen); 1652 } 1653 } 1654 if (path != NULL) { 1655 /* Try to keep a real-rooted full pathname. */ 1656 if (fullpath_disabled && path[0] == '/' && 1657 strcmp(mypr->pr_path, "/")) 1658 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1659 mypr->pr_path, path); 1660 else 1661 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1662 pr->pr_root = root; 1663 } 1664 if (PR_HOST & ch_flags & ~pr_flags) { 1665 if (pr->pr_flags & PR_HOST) { 1666 /* 1667 * Copy the parent's host info. As with pr_ip4 above, 1668 * the lack of a lock on the parent is not a problem; 1669 * it is always set with allprison_lock at least 1670 * shared, and is held exclusively here. 1671 */ 1672 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1673 sizeof(pr->pr_hostname)); 1674 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1675 sizeof(pr->pr_domainname)); 1676 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1677 sizeof(pr->pr_hostuuid)); 1678 pr->pr_hostid = pr->pr_parent->pr_hostid; 1679 } 1680 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1681 /* Set this prison, and any descendants without PR_HOST. */ 1682 if (host != NULL) 1683 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1684 if (domain != NULL) 1685 strlcpy(pr->pr_domainname, domain, 1686 sizeof(pr->pr_domainname)); 1687 if (uuid != NULL) 1688 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1689 if (gothid) 1690 pr->pr_hostid = hid; 1691 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1692 if (tpr->pr_flags & PR_HOST) 1693 descend = 0; 1694 else { 1695 if (host != NULL) 1696 strlcpy(tpr->pr_hostname, 1697 pr->pr_hostname, 1698 sizeof(tpr->pr_hostname)); 1699 if (domain != NULL) 1700 strlcpy(tpr->pr_domainname, 1701 pr->pr_domainname, 1702 sizeof(tpr->pr_domainname)); 1703 if (uuid != NULL) 1704 strlcpy(tpr->pr_hostuuid, 1705 pr->pr_hostuuid, 1706 sizeof(tpr->pr_hostuuid)); 1707 if (gothid) 1708 tpr->pr_hostid = hid; 1709 } 1710 } 1711 } 1712 if ((tallow = ch_allow & ~pr_allow)) { 1713 /* Clear allow bits in all children. */ 1714 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1715 tpr->pr_allow &= ~tallow; 1716 } 1717 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1718 /* 1719 * Persistent prisons get an extra reference, and prisons losing their 1720 * persist flag lose that reference. Only do this for existing prisons 1721 * for now, so new ones will remain unseen until after the module 1722 * handlers have completed. 1723 */ 1724 born = pr->pr_uref == 0; 1725 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1726 if (pr_flags & PR_PERSIST) { 1727 pr->pr_ref++; 1728 pr->pr_uref++; 1729 } else { 1730 pr->pr_ref--; 1731 pr->pr_uref--; 1732 } 1733 } 1734 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1735 mtx_unlock(&pr->pr_mtx); 1736 1737 #ifdef RACCT 1738 if (racct_enable && created) 1739 prison_racct_attach(pr); 1740 #endif 1741 1742 /* Locks may have prevented a complete restriction of child IP 1743 * addresses. If so, allocate some more memory and try again. 1744 */ 1745 #ifdef INET 1746 while (redo_ip4) { 1747 ip4s = pr->pr_ip4s; 1748 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1749 mtx_lock(&pr->pr_mtx); 1750 redo_ip4 = 0; 1751 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1752 #ifdef VIMAGE 1753 if (tpr->pr_flags & PR_VNET) { 1754 descend = 0; 1755 continue; 1756 } 1757 #endif 1758 if (prison_restrict_ip4(tpr, ip4)) { 1759 if (ip4 != NULL) 1760 ip4 = NULL; 1761 else 1762 redo_ip4 = 1; 1763 } 1764 } 1765 mtx_unlock(&pr->pr_mtx); 1766 } 1767 #endif 1768 #ifdef INET6 1769 while (redo_ip6) { 1770 ip6s = pr->pr_ip6s; 1771 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1772 mtx_lock(&pr->pr_mtx); 1773 redo_ip6 = 0; 1774 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1775 #ifdef VIMAGE 1776 if (tpr->pr_flags & PR_VNET) { 1777 descend = 0; 1778 continue; 1779 } 1780 #endif 1781 if (prison_restrict_ip6(tpr, ip6)) { 1782 if (ip6 != NULL) 1783 ip6 = NULL; 1784 else 1785 redo_ip6 = 1; 1786 } 1787 } 1788 mtx_unlock(&pr->pr_mtx); 1789 } 1790 #endif 1791 1792 /* Let the modules do their work. */ 1793 sx_downgrade(&allprison_lock); 1794 if (born) { 1795 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1796 if (error) { 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 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1805 if (error) { 1806 if (born) 1807 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1808 prison_deref(pr, created 1809 ? PD_LIST_SLOCKED 1810 : PD_DEREF | PD_LIST_SLOCKED); 1811 goto done_errmsg; 1812 } 1813 1814 /* Attach this process to the prison if requested. */ 1815 if (flags & JAIL_ATTACH) { 1816 mtx_lock(&pr->pr_mtx); 1817 error = do_jail_attach(td, pr); 1818 if (error) { 1819 vfs_opterror(opts, "attach failed"); 1820 if (!created) 1821 prison_deref(pr, PD_DEREF); 1822 goto done_errmsg; 1823 } 1824 } 1825 1826 #ifdef RACCT 1827 if (racct_enable && !created) { 1828 if (!(flags & JAIL_ATTACH)) 1829 sx_sunlock(&allprison_lock); 1830 prison_racct_modify(pr); 1831 if (!(flags & JAIL_ATTACH)) 1832 sx_slock(&allprison_lock); 1833 } 1834 #endif 1835 1836 td->td_retval[0] = pr->pr_id; 1837 1838 /* 1839 * Now that it is all there, drop the temporary reference from existing 1840 * prisons. Or add a reference to newly created persistent prisons 1841 * (which was not done earlier so that the prison would not be publicly 1842 * visible). 1843 */ 1844 if (!created) { 1845 prison_deref(pr, (flags & JAIL_ATTACH) 1846 ? PD_DEREF 1847 : PD_DEREF | PD_LIST_SLOCKED); 1848 } else { 1849 if (pr_flags & PR_PERSIST) { 1850 mtx_lock(&pr->pr_mtx); 1851 pr->pr_ref++; 1852 pr->pr_uref++; 1853 mtx_unlock(&pr->pr_mtx); 1854 } 1855 if (!(flags & JAIL_ATTACH)) 1856 sx_sunlock(&allprison_lock); 1857 } 1858 1859 goto done_free; 1860 1861 done_deref_locked: 1862 prison_deref(pr, created 1863 ? PD_LOCKED | PD_LIST_XLOCKED 1864 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1865 goto done_releroot; 1866 done_unlock_list: 1867 sx_xunlock(&allprison_lock); 1868 done_releroot: 1869 if (root != NULL) 1870 vrele(root); 1871 done_errmsg: 1872 if (error) { 1873 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 1874 &errmsg_len) == 0 && errmsg_len > 0) { 1875 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1876 if (optuio->uio_segflg == UIO_SYSSPACE) 1877 bcopy(errmsg, 1878 optuio->uio_iov[errmsg_pos].iov_base, 1879 errmsg_len); 1880 else 1881 copyout(errmsg, 1882 optuio->uio_iov[errmsg_pos].iov_base, 1883 errmsg_len); 1884 } 1885 } 1886 done_free: 1887 #ifdef INET 1888 free(ip4, M_PRISON); 1889 #endif 1890 #ifdef INET6 1891 free(ip6, M_PRISON); 1892 #endif 1893 if (g_path != NULL) 1894 free(g_path, M_TEMP); 1895 vfs_freeopts(opts); 1896 return (error); 1897 } 1898 1899 1900 /* 1901 * struct jail_get_args { 1902 * struct iovec *iovp; 1903 * unsigned int iovcnt; 1904 * int flags; 1905 * }; 1906 */ 1907 int 1908 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1909 { 1910 struct uio *auio; 1911 int error; 1912 1913 /* Check that we have an even number of iovecs. */ 1914 if (uap->iovcnt & 1) 1915 return (EINVAL); 1916 1917 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1918 if (error) 1919 return (error); 1920 error = kern_jail_get(td, auio, uap->flags); 1921 if (error == 0) 1922 error = copyout(auio->uio_iov, uap->iovp, 1923 uap->iovcnt * sizeof (struct iovec)); 1924 free(auio, M_IOV); 1925 return (error); 1926 } 1927 1928 int 1929 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1930 { 1931 struct bool_flags *bf; 1932 struct jailsys_flags *jsf; 1933 struct prison *pr, *mypr; 1934 struct vfsopt *opt; 1935 struct vfsoptlist *opts; 1936 char *errmsg, *name; 1937 int error, errmsg_len, errmsg_pos, i, jid, len, locked, pos; 1938 unsigned f; 1939 1940 if (flags & ~JAIL_GET_MASK) 1941 return (EINVAL); 1942 1943 /* Get the parameter list. */ 1944 error = vfs_buildopts(optuio, &opts); 1945 if (error) 1946 return (error); 1947 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1948 mypr = td->td_ucred->cr_prison; 1949 1950 /* 1951 * Find the prison specified by one of: lastjid, jid, name. 1952 */ 1953 sx_slock(&allprison_lock); 1954 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1955 if (error == 0) { 1956 TAILQ_FOREACH(pr, &allprison, pr_list) { 1957 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1958 mtx_lock(&pr->pr_mtx); 1959 if (pr->pr_ref > 0 && 1960 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1961 break; 1962 mtx_unlock(&pr->pr_mtx); 1963 } 1964 } 1965 if (pr != NULL) 1966 goto found_prison; 1967 error = ENOENT; 1968 vfs_opterror(opts, "no jail after %d", jid); 1969 goto done_unlock_list; 1970 } else if (error != ENOENT) 1971 goto done_unlock_list; 1972 1973 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1974 if (error == 0) { 1975 if (jid != 0) { 1976 pr = prison_find_child(mypr, jid); 1977 if (pr != NULL) { 1978 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1979 mtx_unlock(&pr->pr_mtx); 1980 error = ENOENT; 1981 vfs_opterror(opts, "jail %d is dying", 1982 jid); 1983 goto done_unlock_list; 1984 } 1985 goto found_prison; 1986 } 1987 error = ENOENT; 1988 vfs_opterror(opts, "jail %d not found", jid); 1989 goto done_unlock_list; 1990 } 1991 } else if (error != ENOENT) 1992 goto done_unlock_list; 1993 1994 error = vfs_getopt(opts, "name", (void **)&name, &len); 1995 if (error == 0) { 1996 if (len == 0 || name[len - 1] != '\0') { 1997 error = EINVAL; 1998 goto done_unlock_list; 1999 } 2000 pr = prison_find_name(mypr, name); 2001 if (pr != NULL) { 2002 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2003 mtx_unlock(&pr->pr_mtx); 2004 error = ENOENT; 2005 vfs_opterror(opts, "jail \"%s\" is dying", 2006 name); 2007 goto done_unlock_list; 2008 } 2009 goto found_prison; 2010 } 2011 error = ENOENT; 2012 vfs_opterror(opts, "jail \"%s\" not found", name); 2013 goto done_unlock_list; 2014 } else if (error != ENOENT) 2015 goto done_unlock_list; 2016 2017 vfs_opterror(opts, "no jail specified"); 2018 error = ENOENT; 2019 goto done_unlock_list; 2020 2021 found_prison: 2022 /* Get the parameters of the prison. */ 2023 pr->pr_ref++; 2024 locked = PD_LOCKED; 2025 td->td_retval[0] = pr->pr_id; 2026 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2027 if (error != 0 && error != ENOENT) 2028 goto done_deref; 2029 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2030 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2031 if (error != 0 && error != ENOENT) 2032 goto done_deref; 2033 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2034 if (error != 0 && error != ENOENT) 2035 goto done_deref; 2036 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2037 sizeof(pr->pr_cpuset->cs_id)); 2038 if (error != 0 && error != ENOENT) 2039 goto done_deref; 2040 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2041 if (error != 0 && error != ENOENT) 2042 goto done_deref; 2043 #ifdef INET 2044 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2045 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2046 if (error != 0 && error != ENOENT) 2047 goto done_deref; 2048 #endif 2049 #ifdef INET6 2050 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2051 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2052 if (error != 0 && error != ENOENT) 2053 goto done_deref; 2054 #endif 2055 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2056 sizeof(pr->pr_securelevel)); 2057 if (error != 0 && error != ENOENT) 2058 goto done_deref; 2059 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2060 sizeof(pr->pr_childcount)); 2061 if (error != 0 && error != ENOENT) 2062 goto done_deref; 2063 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2064 sizeof(pr->pr_childmax)); 2065 if (error != 0 && error != ENOENT) 2066 goto done_deref; 2067 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2068 if (error != 0 && error != ENOENT) 2069 goto done_deref; 2070 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2071 if (error != 0 && error != ENOENT) 2072 goto done_deref; 2073 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2074 if (error != 0 && error != ENOENT) 2075 goto done_deref; 2076 #ifdef COMPAT_FREEBSD32 2077 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2078 uint32_t hid32 = pr->pr_hostid; 2079 2080 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2081 } else 2082 #endif 2083 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2084 sizeof(pr->pr_hostid)); 2085 if (error != 0 && error != ENOENT) 2086 goto done_deref; 2087 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2088 sizeof(pr->pr_enforce_statfs)); 2089 if (error != 0 && error != ENOENT) 2090 goto done_deref; 2091 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2092 sizeof(pr->pr_devfs_rsnum)); 2093 if (error != 0 && error != ENOENT) 2094 goto done_deref; 2095 for (bf = pr_flag_bool; 2096 bf < pr_flag_bool + nitems(pr_flag_bool); 2097 bf++) { 2098 i = (pr->pr_flags & bf->flag) ? 1 : 0; 2099 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2100 if (error != 0 && error != ENOENT) 2101 goto done_deref; 2102 i = !i; 2103 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2104 if (error != 0 && error != ENOENT) 2105 goto done_deref; 2106 } 2107 for (jsf = pr_flag_jailsys; 2108 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 2109 jsf++) { 2110 f = pr->pr_flags & (jsf->disable | jsf->new); 2111 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE 2112 : (f == jsf->new) ? JAIL_SYS_NEW 2113 : JAIL_SYS_INHERIT; 2114 error = vfs_setopt(opts, jsf->name, &i, sizeof(i)); 2115 if (error != 0 && error != ENOENT) 2116 goto done_deref; 2117 } 2118 for (bf = pr_flag_allow; 2119 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 2120 bf++) { 2121 i = (pr->pr_allow & bf->flag) ? 1 : 0; 2122 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2123 if (error != 0 && error != ENOENT) 2124 goto done_deref; 2125 i = !i; 2126 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2127 if (error != 0 && error != ENOENT) 2128 goto done_deref; 2129 } 2130 i = (pr->pr_uref == 0); 2131 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2132 if (error != 0 && error != ENOENT) 2133 goto done_deref; 2134 i = !i; 2135 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2136 if (error != 0 && error != ENOENT) 2137 goto done_deref; 2138 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2139 sizeof(pr->pr_osreldate)); 2140 if (error != 0 && error != ENOENT) 2141 goto done_deref; 2142 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2143 if (error != 0 && error != ENOENT) 2144 goto done_deref; 2145 2146 /* Get the module parameters. */ 2147 mtx_unlock(&pr->pr_mtx); 2148 locked = 0; 2149 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2150 if (error) 2151 goto done_deref; 2152 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2153 2154 /* By now, all parameters should have been noted. */ 2155 TAILQ_FOREACH(opt, opts, link) { 2156 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2157 error = EINVAL; 2158 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2159 goto done_errmsg; 2160 } 2161 } 2162 2163 /* Write the fetched parameters back to userspace. */ 2164 error = 0; 2165 TAILQ_FOREACH(opt, opts, link) { 2166 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2167 pos = 2 * opt->pos + 1; 2168 optuio->uio_iov[pos].iov_len = opt->len; 2169 if (opt->value != NULL) { 2170 if (optuio->uio_segflg == UIO_SYSSPACE) { 2171 bcopy(opt->value, 2172 optuio->uio_iov[pos].iov_base, 2173 opt->len); 2174 } else { 2175 error = copyout(opt->value, 2176 optuio->uio_iov[pos].iov_base, 2177 opt->len); 2178 if (error) 2179 break; 2180 } 2181 } 2182 } 2183 } 2184 goto done_errmsg; 2185 2186 done_deref: 2187 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2188 goto done_errmsg; 2189 2190 done_unlock_list: 2191 sx_sunlock(&allprison_lock); 2192 done_errmsg: 2193 if (error && errmsg_pos >= 0) { 2194 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2195 errmsg_pos = 2 * errmsg_pos + 1; 2196 if (errmsg_len > 0) { 2197 if (optuio->uio_segflg == UIO_SYSSPACE) 2198 bcopy(errmsg, 2199 optuio->uio_iov[errmsg_pos].iov_base, 2200 errmsg_len); 2201 else 2202 copyout(errmsg, 2203 optuio->uio_iov[errmsg_pos].iov_base, 2204 errmsg_len); 2205 } 2206 } 2207 vfs_freeopts(opts); 2208 return (error); 2209 } 2210 2211 2212 /* 2213 * struct jail_remove_args { 2214 * int jid; 2215 * }; 2216 */ 2217 int 2218 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2219 { 2220 struct prison *pr, *cpr, *lpr, *tpr; 2221 int descend, error; 2222 2223 error = priv_check(td, PRIV_JAIL_REMOVE); 2224 if (error) 2225 return (error); 2226 2227 sx_xlock(&allprison_lock); 2228 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2229 if (pr == NULL) { 2230 sx_xunlock(&allprison_lock); 2231 return (EINVAL); 2232 } 2233 2234 /* Remove all descendants of this prison, then remove this prison. */ 2235 pr->pr_ref++; 2236 if (!LIST_EMPTY(&pr->pr_children)) { 2237 mtx_unlock(&pr->pr_mtx); 2238 lpr = NULL; 2239 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2240 mtx_lock(&cpr->pr_mtx); 2241 if (cpr->pr_ref > 0) { 2242 tpr = cpr; 2243 cpr->pr_ref++; 2244 } else { 2245 /* Already removed - do not do it again. */ 2246 tpr = NULL; 2247 } 2248 mtx_unlock(&cpr->pr_mtx); 2249 if (lpr != NULL) { 2250 mtx_lock(&lpr->pr_mtx); 2251 prison_remove_one(lpr); 2252 sx_xlock(&allprison_lock); 2253 } 2254 lpr = tpr; 2255 } 2256 if (lpr != NULL) { 2257 mtx_lock(&lpr->pr_mtx); 2258 prison_remove_one(lpr); 2259 sx_xlock(&allprison_lock); 2260 } 2261 mtx_lock(&pr->pr_mtx); 2262 } 2263 prison_remove_one(pr); 2264 return (0); 2265 } 2266 2267 static void 2268 prison_remove_one(struct prison *pr) 2269 { 2270 struct proc *p; 2271 int deuref; 2272 2273 /* If the prison was persistent, it is not anymore. */ 2274 deuref = 0; 2275 if (pr->pr_flags & PR_PERSIST) { 2276 pr->pr_ref--; 2277 deuref = PD_DEUREF; 2278 pr->pr_flags &= ~PR_PERSIST; 2279 } 2280 2281 /* 2282 * jail_remove added a reference. If that's the only one, remove 2283 * the prison now. 2284 */ 2285 KASSERT(pr->pr_ref > 0, 2286 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2287 if (pr->pr_ref == 1) { 2288 prison_deref(pr, 2289 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2290 return; 2291 } 2292 2293 mtx_unlock(&pr->pr_mtx); 2294 sx_xunlock(&allprison_lock); 2295 /* 2296 * Kill all processes unfortunate enough to be attached to this prison. 2297 */ 2298 sx_slock(&allproc_lock); 2299 FOREACH_PROC_IN_SYSTEM(p) { 2300 PROC_LOCK(p); 2301 if (p->p_state != PRS_NEW && p->p_ucred && 2302 p->p_ucred->cr_prison == pr) 2303 kern_psignal(p, SIGKILL); 2304 PROC_UNLOCK(p); 2305 } 2306 sx_sunlock(&allproc_lock); 2307 /* Remove the temporary reference added by jail_remove. */ 2308 prison_deref(pr, deuref | PD_DEREF); 2309 } 2310 2311 2312 /* 2313 * struct jail_attach_args { 2314 * int jid; 2315 * }; 2316 */ 2317 int 2318 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2319 { 2320 struct prison *pr; 2321 int error; 2322 2323 error = priv_check(td, PRIV_JAIL_ATTACH); 2324 if (error) 2325 return (error); 2326 2327 /* 2328 * Start with exclusive hold on allprison_lock to ensure that a possible 2329 * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove. 2330 * But then immediately downgrade it since we don't need to stop 2331 * readers. 2332 */ 2333 sx_xlock(&allprison_lock); 2334 sx_downgrade(&allprison_lock); 2335 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2336 if (pr == NULL) { 2337 sx_sunlock(&allprison_lock); 2338 return (EINVAL); 2339 } 2340 2341 /* 2342 * Do not allow a process to attach to a prison that is not 2343 * considered to be "alive". 2344 */ 2345 if (pr->pr_uref == 0) { 2346 mtx_unlock(&pr->pr_mtx); 2347 sx_sunlock(&allprison_lock); 2348 return (EINVAL); 2349 } 2350 2351 return (do_jail_attach(td, pr)); 2352 } 2353 2354 static int 2355 do_jail_attach(struct thread *td, struct prison *pr) 2356 { 2357 struct proc *p; 2358 struct ucred *newcred, *oldcred; 2359 int error; 2360 2361 /* 2362 * XXX: Note that there is a slight race here if two threads 2363 * in the same privileged process attempt to attach to two 2364 * different jails at the same time. It is important for 2365 * user processes not to do this, or they might end up with 2366 * a process root from one prison, but attached to the jail 2367 * of another. 2368 */ 2369 pr->pr_ref++; 2370 pr->pr_uref++; 2371 mtx_unlock(&pr->pr_mtx); 2372 2373 /* Let modules do whatever they need to prepare for attaching. */ 2374 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2375 if (error) { 2376 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2377 return (error); 2378 } 2379 sx_sunlock(&allprison_lock); 2380 2381 /* 2382 * Reparent the newly attached process to this jail. 2383 */ 2384 p = td->td_proc; 2385 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2386 if (error) 2387 goto e_revert_osd; 2388 2389 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2390 if ((error = change_dir(pr->pr_root, td)) != 0) 2391 goto e_unlock; 2392 #ifdef MAC 2393 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2394 goto e_unlock; 2395 #endif 2396 VOP_UNLOCK(pr->pr_root, 0); 2397 if ((error = pwd_chroot(td, pr->pr_root))) 2398 goto e_revert_osd; 2399 2400 newcred = crget(); 2401 PROC_LOCK(p); 2402 oldcred = crcopysafe(p, newcred); 2403 newcred->cr_prison = pr; 2404 proc_set_cred(p, newcred); 2405 setsugid(p); 2406 #ifdef RACCT 2407 racct_proc_ucred_changed(p, oldcred, newcred); 2408 crhold(newcred); 2409 #endif 2410 PROC_UNLOCK(p); 2411 #ifdef RCTL 2412 rctl_proc_ucred_changed(p, newcred); 2413 crfree(newcred); 2414 #endif 2415 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF); 2416 crfree(oldcred); 2417 return (0); 2418 2419 e_unlock: 2420 VOP_UNLOCK(pr->pr_root, 0); 2421 e_revert_osd: 2422 /* Tell modules this thread is still in its old jail after all. */ 2423 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2424 prison_deref(pr, PD_DEREF | PD_DEUREF); 2425 return (error); 2426 } 2427 2428 2429 /* 2430 * Returns a locked prison instance, or NULL on failure. 2431 */ 2432 struct prison * 2433 prison_find(int prid) 2434 { 2435 struct prison *pr; 2436 2437 sx_assert(&allprison_lock, SX_LOCKED); 2438 TAILQ_FOREACH(pr, &allprison, pr_list) { 2439 if (pr->pr_id == prid) { 2440 mtx_lock(&pr->pr_mtx); 2441 if (pr->pr_ref > 0) 2442 return (pr); 2443 mtx_unlock(&pr->pr_mtx); 2444 } 2445 } 2446 return (NULL); 2447 } 2448 2449 /* 2450 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2451 */ 2452 struct prison * 2453 prison_find_child(struct prison *mypr, int prid) 2454 { 2455 struct prison *pr; 2456 int descend; 2457 2458 sx_assert(&allprison_lock, SX_LOCKED); 2459 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2460 if (pr->pr_id == prid) { 2461 mtx_lock(&pr->pr_mtx); 2462 if (pr->pr_ref > 0) 2463 return (pr); 2464 mtx_unlock(&pr->pr_mtx); 2465 } 2466 } 2467 return (NULL); 2468 } 2469 2470 /* 2471 * Look for the name relative to mypr. Returns a locked prison or NULL. 2472 */ 2473 struct prison * 2474 prison_find_name(struct prison *mypr, const char *name) 2475 { 2476 struct prison *pr, *deadpr; 2477 size_t mylen; 2478 int descend; 2479 2480 sx_assert(&allprison_lock, SX_LOCKED); 2481 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2482 again: 2483 deadpr = NULL; 2484 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2485 if (!strcmp(pr->pr_name + mylen, name)) { 2486 mtx_lock(&pr->pr_mtx); 2487 if (pr->pr_ref > 0) { 2488 if (pr->pr_uref > 0) 2489 return (pr); 2490 deadpr = pr; 2491 } 2492 mtx_unlock(&pr->pr_mtx); 2493 } 2494 } 2495 /* There was no valid prison - perhaps there was a dying one. */ 2496 if (deadpr != NULL) { 2497 mtx_lock(&deadpr->pr_mtx); 2498 if (deadpr->pr_ref == 0) { 2499 mtx_unlock(&deadpr->pr_mtx); 2500 goto again; 2501 } 2502 } 2503 return (deadpr); 2504 } 2505 2506 /* 2507 * See if a prison has the specific flag set. 2508 */ 2509 int 2510 prison_flag(struct ucred *cred, unsigned flag) 2511 { 2512 2513 /* This is an atomic read, so no locking is necessary. */ 2514 return (cred->cr_prison->pr_flags & flag); 2515 } 2516 2517 int 2518 prison_allow(struct ucred *cred, unsigned flag) 2519 { 2520 2521 /* This is an atomic read, so no locking is necessary. */ 2522 return (cred->cr_prison->pr_allow & flag); 2523 } 2524 2525 /* 2526 * Remove a prison reference. If that was the last reference, remove the 2527 * prison itself - but not in this context in case there are locks held. 2528 */ 2529 void 2530 prison_free_locked(struct prison *pr) 2531 { 2532 int ref; 2533 2534 mtx_assert(&pr->pr_mtx, MA_OWNED); 2535 ref = --pr->pr_ref; 2536 mtx_unlock(&pr->pr_mtx); 2537 if (ref == 0) 2538 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2539 } 2540 2541 void 2542 prison_free(struct prison *pr) 2543 { 2544 2545 mtx_lock(&pr->pr_mtx); 2546 prison_free_locked(pr); 2547 } 2548 2549 /* 2550 * Complete a call to either prison_free or prison_proc_free. 2551 */ 2552 static void 2553 prison_complete(void *context, int pending) 2554 { 2555 struct prison *pr = context; 2556 2557 sx_xlock(&allprison_lock); 2558 mtx_lock(&pr->pr_mtx); 2559 prison_deref(pr, pr->pr_uref 2560 ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED 2561 : PD_LOCKED | PD_LIST_XLOCKED); 2562 } 2563 2564 /* 2565 * Remove a prison reference (usually). This internal version assumes no 2566 * mutexes are held, except perhaps the prison itself. If there are no more 2567 * references, release and delist the prison. On completion, the prison lock 2568 * and the allprison lock are both unlocked. 2569 */ 2570 static void 2571 prison_deref(struct prison *pr, int flags) 2572 { 2573 struct prison *ppr, *tpr; 2574 int ref, lasturef; 2575 2576 if (!(flags & PD_LOCKED)) 2577 mtx_lock(&pr->pr_mtx); 2578 for (;;) { 2579 if (flags & PD_DEUREF) { 2580 KASSERT(pr->pr_uref > 0, 2581 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 2582 pr->pr_id)); 2583 pr->pr_uref--; 2584 lasturef = pr->pr_uref == 0; 2585 if (lasturef) 2586 pr->pr_ref++; 2587 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2588 } else 2589 lasturef = 0; 2590 if (flags & PD_DEREF) { 2591 KASSERT(pr->pr_ref > 0, 2592 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 2593 pr->pr_id)); 2594 pr->pr_ref--; 2595 } 2596 ref = pr->pr_ref; 2597 mtx_unlock(&pr->pr_mtx); 2598 2599 /* 2600 * Tell the modules if the last user reference was removed 2601 * (even it sticks around in dying state). 2602 */ 2603 if (lasturef) { 2604 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) { 2605 sx_xlock(&allprison_lock); 2606 flags |= PD_LIST_XLOCKED; 2607 } 2608 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 2609 mtx_lock(&pr->pr_mtx); 2610 ref = --pr->pr_ref; 2611 mtx_unlock(&pr->pr_mtx); 2612 } 2613 2614 /* If the prison still has references, nothing else to do. */ 2615 if (ref > 0) { 2616 if (flags & PD_LIST_SLOCKED) 2617 sx_sunlock(&allprison_lock); 2618 else if (flags & PD_LIST_XLOCKED) 2619 sx_xunlock(&allprison_lock); 2620 return; 2621 } 2622 2623 if (flags & PD_LIST_SLOCKED) { 2624 if (!sx_try_upgrade(&allprison_lock)) { 2625 sx_sunlock(&allprison_lock); 2626 sx_xlock(&allprison_lock); 2627 } 2628 } else if (!(flags & PD_LIST_XLOCKED)) 2629 sx_xlock(&allprison_lock); 2630 2631 TAILQ_REMOVE(&allprison, pr, pr_list); 2632 LIST_REMOVE(pr, pr_sibling); 2633 ppr = pr->pr_parent; 2634 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2635 tpr->pr_childcount--; 2636 sx_xunlock(&allprison_lock); 2637 2638 #ifdef VIMAGE 2639 if (pr->pr_vnet != ppr->pr_vnet) 2640 vnet_destroy(pr->pr_vnet); 2641 #endif 2642 if (pr->pr_root != NULL) 2643 vrele(pr->pr_root); 2644 mtx_destroy(&pr->pr_mtx); 2645 #ifdef INET 2646 free(pr->pr_ip4, M_PRISON); 2647 #endif 2648 #ifdef INET6 2649 free(pr->pr_ip6, M_PRISON); 2650 #endif 2651 if (pr->pr_cpuset != NULL) 2652 cpuset_rel(pr->pr_cpuset); 2653 osd_jail_exit(pr); 2654 #ifdef RACCT 2655 if (racct_enable) 2656 prison_racct_detach(pr); 2657 #endif 2658 free(pr, M_PRISON); 2659 2660 /* Removing a prison frees a reference on its parent. */ 2661 pr = ppr; 2662 mtx_lock(&pr->pr_mtx); 2663 flags = PD_DEREF | PD_DEUREF; 2664 } 2665 } 2666 2667 void 2668 prison_hold_locked(struct prison *pr) 2669 { 2670 2671 mtx_assert(&pr->pr_mtx, MA_OWNED); 2672 KASSERT(pr->pr_ref > 0, 2673 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id)); 2674 pr->pr_ref++; 2675 } 2676 2677 void 2678 prison_hold(struct prison *pr) 2679 { 2680 2681 mtx_lock(&pr->pr_mtx); 2682 prison_hold_locked(pr); 2683 mtx_unlock(&pr->pr_mtx); 2684 } 2685 2686 void 2687 prison_proc_hold(struct prison *pr) 2688 { 2689 2690 mtx_lock(&pr->pr_mtx); 2691 KASSERT(pr->pr_uref > 0, 2692 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2693 pr->pr_uref++; 2694 mtx_unlock(&pr->pr_mtx); 2695 } 2696 2697 void 2698 prison_proc_free(struct prison *pr) 2699 { 2700 2701 mtx_lock(&pr->pr_mtx); 2702 KASSERT(pr->pr_uref > 0, 2703 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2704 if (pr->pr_uref > 1) 2705 pr->pr_uref--; 2706 else { 2707 /* 2708 * Don't remove the last user reference in this context, which 2709 * is expected to be a process that is not only locked, but 2710 * also half dead. 2711 */ 2712 pr->pr_ref++; 2713 mtx_unlock(&pr->pr_mtx); 2714 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2715 return; 2716 } 2717 mtx_unlock(&pr->pr_mtx); 2718 } 2719 2720 /* 2721 * Check if a jail supports the given address family. 2722 * 2723 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 2724 * if not. 2725 */ 2726 int 2727 prison_check_af(struct ucred *cred, int af) 2728 { 2729 struct prison *pr; 2730 int error; 2731 2732 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2733 2734 pr = cred->cr_prison; 2735 #ifdef VIMAGE 2736 /* Prisons with their own network stack are not limited. */ 2737 if (prison_owns_vnet(cred)) 2738 return (0); 2739 #endif 2740 2741 error = 0; 2742 switch (af) 2743 { 2744 #ifdef INET 2745 case AF_INET: 2746 if (pr->pr_flags & PR_IP4) 2747 { 2748 mtx_lock(&pr->pr_mtx); 2749 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 2750 error = EAFNOSUPPORT; 2751 mtx_unlock(&pr->pr_mtx); 2752 } 2753 break; 2754 #endif 2755 #ifdef INET6 2756 case AF_INET6: 2757 if (pr->pr_flags & PR_IP6) 2758 { 2759 mtx_lock(&pr->pr_mtx); 2760 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 2761 error = EAFNOSUPPORT; 2762 mtx_unlock(&pr->pr_mtx); 2763 } 2764 break; 2765 #endif 2766 case AF_LOCAL: 2767 case AF_ROUTE: 2768 break; 2769 default: 2770 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 2771 error = EAFNOSUPPORT; 2772 } 2773 return (error); 2774 } 2775 2776 /* 2777 * Check if given address belongs to the jail referenced by cred (wrapper to 2778 * prison_check_ip[46]). 2779 * 2780 * Returns 0 if jail doesn't restrict the address family or if address belongs 2781 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 2782 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 2783 */ 2784 int 2785 prison_if(struct ucred *cred, struct sockaddr *sa) 2786 { 2787 #ifdef INET 2788 struct sockaddr_in *sai; 2789 #endif 2790 #ifdef INET6 2791 struct sockaddr_in6 *sai6; 2792 #endif 2793 int error; 2794 2795 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2796 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 2797 2798 #ifdef VIMAGE 2799 if (prison_owns_vnet(cred)) 2800 return (0); 2801 #endif 2802 2803 error = 0; 2804 switch (sa->sa_family) 2805 { 2806 #ifdef INET 2807 case AF_INET: 2808 sai = (struct sockaddr_in *)sa; 2809 error = prison_check_ip4(cred, &sai->sin_addr); 2810 break; 2811 #endif 2812 #ifdef INET6 2813 case AF_INET6: 2814 sai6 = (struct sockaddr_in6 *)sa; 2815 error = prison_check_ip6(cred, &sai6->sin6_addr); 2816 break; 2817 #endif 2818 default: 2819 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 2820 error = EAFNOSUPPORT; 2821 } 2822 return (error); 2823 } 2824 2825 /* 2826 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 2827 */ 2828 int 2829 prison_check(struct ucred *cred1, struct ucred *cred2) 2830 { 2831 2832 return ((cred1->cr_prison == cred2->cr_prison || 2833 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 2834 } 2835 2836 /* 2837 * Return 1 if p2 is a child of p1, otherwise 0. 2838 */ 2839 int 2840 prison_ischild(struct prison *pr1, struct prison *pr2) 2841 { 2842 2843 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 2844 if (pr1 == pr2) 2845 return (1); 2846 return (0); 2847 } 2848 2849 /* 2850 * Return 1 if the passed credential is in a jail, otherwise 0. 2851 */ 2852 int 2853 jailed(struct ucred *cred) 2854 { 2855 2856 return (cred->cr_prison != &prison0); 2857 } 2858 2859 /* 2860 * Return 1 if the passed credential is in a jail and that jail does not 2861 * have its own virtual network stack, otherwise 0. 2862 */ 2863 int 2864 jailed_without_vnet(struct ucred *cred) 2865 { 2866 2867 if (!jailed(cred)) 2868 return (0); 2869 #ifdef VIMAGE 2870 if (prison_owns_vnet(cred)) 2871 return (0); 2872 #endif 2873 2874 return (1); 2875 } 2876 2877 /* 2878 * Return the correct hostname (domainname, et al) for the passed credential. 2879 */ 2880 void 2881 getcredhostname(struct ucred *cred, char *buf, size_t size) 2882 { 2883 struct prison *pr; 2884 2885 /* 2886 * A NULL credential can be used to shortcut to the physical 2887 * system's hostname. 2888 */ 2889 pr = (cred != NULL) ? cred->cr_prison : &prison0; 2890 mtx_lock(&pr->pr_mtx); 2891 strlcpy(buf, pr->pr_hostname, size); 2892 mtx_unlock(&pr->pr_mtx); 2893 } 2894 2895 void 2896 getcreddomainname(struct ucred *cred, char *buf, size_t size) 2897 { 2898 2899 mtx_lock(&cred->cr_prison->pr_mtx); 2900 strlcpy(buf, cred->cr_prison->pr_domainname, size); 2901 mtx_unlock(&cred->cr_prison->pr_mtx); 2902 } 2903 2904 void 2905 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 2906 { 2907 2908 mtx_lock(&cred->cr_prison->pr_mtx); 2909 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 2910 mtx_unlock(&cred->cr_prison->pr_mtx); 2911 } 2912 2913 void 2914 getcredhostid(struct ucred *cred, unsigned long *hostid) 2915 { 2916 2917 mtx_lock(&cred->cr_prison->pr_mtx); 2918 *hostid = cred->cr_prison->pr_hostid; 2919 mtx_unlock(&cred->cr_prison->pr_mtx); 2920 } 2921 2922 #ifdef VIMAGE 2923 /* 2924 * Determine whether the prison represented by cred owns 2925 * its vnet rather than having it inherited. 2926 * 2927 * Returns 1 in case the prison owns the vnet, 0 otherwise. 2928 */ 2929 int 2930 prison_owns_vnet(struct ucred *cred) 2931 { 2932 2933 /* 2934 * vnets cannot be added/removed after jail creation, 2935 * so no need to lock here. 2936 */ 2937 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 2938 } 2939 #endif 2940 2941 /* 2942 * Determine whether the subject represented by cred can "see" 2943 * status of a mount point. 2944 * Returns: 0 for permitted, ENOENT otherwise. 2945 * XXX: This function should be called cr_canseemount() and should be 2946 * placed in kern_prot.c. 2947 */ 2948 int 2949 prison_canseemount(struct ucred *cred, struct mount *mp) 2950 { 2951 struct prison *pr; 2952 struct statfs *sp; 2953 size_t len; 2954 2955 pr = cred->cr_prison; 2956 if (pr->pr_enforce_statfs == 0) 2957 return (0); 2958 if (pr->pr_root->v_mount == mp) 2959 return (0); 2960 if (pr->pr_enforce_statfs == 2) 2961 return (ENOENT); 2962 /* 2963 * If jail's chroot directory is set to "/" we should be able to see 2964 * all mount-points from inside a jail. 2965 * This is ugly check, but this is the only situation when jail's 2966 * directory ends with '/'. 2967 */ 2968 if (strcmp(pr->pr_path, "/") == 0) 2969 return (0); 2970 len = strlen(pr->pr_path); 2971 sp = &mp->mnt_stat; 2972 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 2973 return (ENOENT); 2974 /* 2975 * Be sure that we don't have situation where jail's root directory 2976 * is "/some/path" and mount point is "/some/pathpath". 2977 */ 2978 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 2979 return (ENOENT); 2980 return (0); 2981 } 2982 2983 void 2984 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 2985 { 2986 char jpath[MAXPATHLEN]; 2987 struct prison *pr; 2988 size_t len; 2989 2990 pr = cred->cr_prison; 2991 if (pr->pr_enforce_statfs == 0) 2992 return; 2993 if (prison_canseemount(cred, mp) != 0) { 2994 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 2995 strlcpy(sp->f_mntonname, "[restricted]", 2996 sizeof(sp->f_mntonname)); 2997 return; 2998 } 2999 if (pr->pr_root->v_mount == mp) { 3000 /* 3001 * Clear current buffer data, so we are sure nothing from 3002 * the valid path left there. 3003 */ 3004 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3005 *sp->f_mntonname = '/'; 3006 return; 3007 } 3008 /* 3009 * If jail's chroot directory is set to "/" we should be able to see 3010 * all mount-points from inside a jail. 3011 */ 3012 if (strcmp(pr->pr_path, "/") == 0) 3013 return; 3014 len = strlen(pr->pr_path); 3015 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3016 /* 3017 * Clear current buffer data, so we are sure nothing from 3018 * the valid path left there. 3019 */ 3020 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3021 if (*jpath == '\0') { 3022 /* Should never happen. */ 3023 *sp->f_mntonname = '/'; 3024 } else { 3025 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3026 } 3027 } 3028 3029 /* 3030 * Check with permission for a specific privilege is granted within jail. We 3031 * have a specific list of accepted privileges; the rest are denied. 3032 */ 3033 int 3034 prison_priv_check(struct ucred *cred, int priv) 3035 { 3036 3037 if (!jailed(cred)) 3038 return (0); 3039 3040 #ifdef VIMAGE 3041 /* 3042 * Privileges specific to prisons with a virtual network stack. 3043 * There might be a duplicate entry here in case the privilege 3044 * is only granted conditionally in the legacy jail case. 3045 */ 3046 switch (priv) { 3047 #ifdef notyet 3048 /* 3049 * NFS-specific privileges. 3050 */ 3051 case PRIV_NFS_DAEMON: 3052 case PRIV_NFS_LOCKD: 3053 #endif 3054 /* 3055 * Network stack privileges. 3056 */ 3057 case PRIV_NET_BRIDGE: 3058 case PRIV_NET_GRE: 3059 case PRIV_NET_BPF: 3060 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3061 case PRIV_NET_ROUTE: 3062 case PRIV_NET_TAP: 3063 case PRIV_NET_SETIFMTU: 3064 case PRIV_NET_SETIFFLAGS: 3065 case PRIV_NET_SETIFCAP: 3066 case PRIV_NET_SETIFDESCR: 3067 case PRIV_NET_SETIFNAME : 3068 case PRIV_NET_SETIFMETRIC: 3069 case PRIV_NET_SETIFPHYS: 3070 case PRIV_NET_SETIFMAC: 3071 case PRIV_NET_SETLANPCP: 3072 case PRIV_NET_ADDMULTI: 3073 case PRIV_NET_DELMULTI: 3074 case PRIV_NET_HWIOCTL: 3075 case PRIV_NET_SETLLADDR: 3076 case PRIV_NET_ADDIFGROUP: 3077 case PRIV_NET_DELIFGROUP: 3078 case PRIV_NET_IFCREATE: 3079 case PRIV_NET_IFDESTROY: 3080 case PRIV_NET_ADDIFADDR: 3081 case PRIV_NET_DELIFADDR: 3082 case PRIV_NET_LAGG: 3083 case PRIV_NET_GIF: 3084 case PRIV_NET_SETIFVNET: 3085 case PRIV_NET_SETIFFIB: 3086 3087 /* 3088 * 802.11-related privileges. 3089 */ 3090 case PRIV_NET80211_GETKEY: 3091 #ifdef notyet 3092 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3093 #endif 3094 3095 #ifdef notyet 3096 /* 3097 * ATM privileges. 3098 */ 3099 case PRIV_NETATM_CFG: 3100 case PRIV_NETATM_ADD: 3101 case PRIV_NETATM_DEL: 3102 case PRIV_NETATM_SET: 3103 3104 /* 3105 * Bluetooth privileges. 3106 */ 3107 case PRIV_NETBLUETOOTH_RAW: 3108 #endif 3109 3110 /* 3111 * Netgraph and netgraph module privileges. 3112 */ 3113 case PRIV_NETGRAPH_CONTROL: 3114 #ifdef notyet 3115 case PRIV_NETGRAPH_TTY: 3116 #endif 3117 3118 /* 3119 * IPv4 and IPv6 privileges. 3120 */ 3121 case PRIV_NETINET_IPFW: 3122 case PRIV_NETINET_DIVERT: 3123 case PRIV_NETINET_PF: 3124 case PRIV_NETINET_DUMMYNET: 3125 case PRIV_NETINET_CARP: 3126 case PRIV_NETINET_MROUTE: 3127 case PRIV_NETINET_RAW: 3128 case PRIV_NETINET_ADDRCTRL6: 3129 case PRIV_NETINET_ND6: 3130 case PRIV_NETINET_SCOPE6: 3131 case PRIV_NETINET_ALIFETIME6: 3132 case PRIV_NETINET_IPSEC: 3133 case PRIV_NETINET_BINDANY: 3134 3135 #ifdef notyet 3136 /* 3137 * NCP privileges. 3138 */ 3139 case PRIV_NETNCP: 3140 3141 /* 3142 * SMB privileges. 3143 */ 3144 case PRIV_NETSMB: 3145 #endif 3146 3147 /* 3148 * No default: or deny here. 3149 * In case of no permit fall through to next switch(). 3150 */ 3151 if (cred->cr_prison->pr_flags & PR_VNET) 3152 return (0); 3153 } 3154 #endif /* VIMAGE */ 3155 3156 switch (priv) { 3157 3158 /* 3159 * Allow ktrace privileges for root in jail. 3160 */ 3161 case PRIV_KTRACE: 3162 3163 #if 0 3164 /* 3165 * Allow jailed processes to configure audit identity and 3166 * submit audit records (login, etc). In the future we may 3167 * want to further refine the relationship between audit and 3168 * jail. 3169 */ 3170 case PRIV_AUDIT_GETAUDIT: 3171 case PRIV_AUDIT_SETAUDIT: 3172 case PRIV_AUDIT_SUBMIT: 3173 #endif 3174 3175 /* 3176 * Allow jailed processes to manipulate process UNIX 3177 * credentials in any way they see fit. 3178 */ 3179 case PRIV_CRED_SETUID: 3180 case PRIV_CRED_SETEUID: 3181 case PRIV_CRED_SETGID: 3182 case PRIV_CRED_SETEGID: 3183 case PRIV_CRED_SETGROUPS: 3184 case PRIV_CRED_SETREUID: 3185 case PRIV_CRED_SETREGID: 3186 case PRIV_CRED_SETRESUID: 3187 case PRIV_CRED_SETRESGID: 3188 3189 /* 3190 * Jail implements visibility constraints already, so allow 3191 * jailed root to override uid/gid-based constraints. 3192 */ 3193 case PRIV_SEEOTHERGIDS: 3194 case PRIV_SEEOTHERUIDS: 3195 3196 /* 3197 * Jail implements inter-process debugging limits already, so 3198 * allow jailed root various debugging privileges. 3199 */ 3200 case PRIV_DEBUG_DIFFCRED: 3201 case PRIV_DEBUG_SUGID: 3202 case PRIV_DEBUG_UNPRIV: 3203 3204 /* 3205 * Allow jail to set various resource limits and login 3206 * properties, and for now, exceed process resource limits. 3207 */ 3208 case PRIV_PROC_LIMIT: 3209 case PRIV_PROC_SETLOGIN: 3210 case PRIV_PROC_SETRLIMIT: 3211 3212 /* 3213 * System V and POSIX IPC privileges are granted in jail. 3214 */ 3215 case PRIV_IPC_READ: 3216 case PRIV_IPC_WRITE: 3217 case PRIV_IPC_ADMIN: 3218 case PRIV_IPC_MSGSIZE: 3219 case PRIV_MQ_ADMIN: 3220 3221 /* 3222 * Jail operations within a jail work on child jails. 3223 */ 3224 case PRIV_JAIL_ATTACH: 3225 case PRIV_JAIL_SET: 3226 case PRIV_JAIL_REMOVE: 3227 3228 /* 3229 * Jail implements its own inter-process limits, so allow 3230 * root processes in jail to change scheduling on other 3231 * processes in the same jail. Likewise for signalling. 3232 */ 3233 case PRIV_SCHED_DIFFCRED: 3234 case PRIV_SCHED_CPUSET: 3235 case PRIV_SIGNAL_DIFFCRED: 3236 case PRIV_SIGNAL_SUGID: 3237 3238 /* 3239 * Allow jailed processes to write to sysctls marked as jail 3240 * writable. 3241 */ 3242 case PRIV_SYSCTL_WRITEJAIL: 3243 3244 /* 3245 * Allow root in jail to manage a variety of quota 3246 * properties. These should likely be conditional on a 3247 * configuration option. 3248 */ 3249 case PRIV_VFS_GETQUOTA: 3250 case PRIV_VFS_SETQUOTA: 3251 3252 /* 3253 * Since Jail relies on chroot() to implement file system 3254 * protections, grant many VFS privileges to root in jail. 3255 * Be careful to exclude mount-related and NFS-related 3256 * privileges. 3257 */ 3258 case PRIV_VFS_READ: 3259 case PRIV_VFS_WRITE: 3260 case PRIV_VFS_ADMIN: 3261 case PRIV_VFS_EXEC: 3262 case PRIV_VFS_LOOKUP: 3263 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3264 case PRIV_VFS_CHFLAGS_DEV: 3265 case PRIV_VFS_CHOWN: 3266 case PRIV_VFS_CHROOT: 3267 case PRIV_VFS_RETAINSUGID: 3268 case PRIV_VFS_FCHROOT: 3269 case PRIV_VFS_LINK: 3270 case PRIV_VFS_SETGID: 3271 case PRIV_VFS_STAT: 3272 case PRIV_VFS_STICKYFILE: 3273 3274 /* 3275 * As in the non-jail case, non-root users are expected to be 3276 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3277 * exists in the jail and they have permission to access it). 3278 */ 3279 case PRIV_KMEM_READ: 3280 return (0); 3281 3282 /* 3283 * Depending on the global setting, allow privilege of 3284 * setting system flags. 3285 */ 3286 case PRIV_VFS_SYSFLAGS: 3287 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3288 return (0); 3289 else 3290 return (EPERM); 3291 3292 /* 3293 * Depending on the global setting, allow privilege of 3294 * mounting/unmounting file systems. 3295 */ 3296 case PRIV_VFS_MOUNT: 3297 case PRIV_VFS_UNMOUNT: 3298 case PRIV_VFS_MOUNT_NONUSER: 3299 case PRIV_VFS_MOUNT_OWNER: 3300 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3301 cred->cr_prison->pr_enforce_statfs < 2) 3302 return (0); 3303 else 3304 return (EPERM); 3305 3306 /* 3307 * Conditionnaly allow locking (unlocking) physical pages 3308 * in memory. 3309 */ 3310 case PRIV_VM_MLOCK: 3311 case PRIV_VM_MUNLOCK: 3312 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK) 3313 return (0); 3314 else 3315 return (EPERM); 3316 3317 /* 3318 * Conditionally allow jailed root to bind reserved ports. 3319 */ 3320 case PRIV_NETINET_RESERVEDPORT: 3321 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS) 3322 return (0); 3323 else 3324 return (EPERM); 3325 3326 /* 3327 * Allow jailed root to reuse in-use ports. 3328 */ 3329 case PRIV_NETINET_REUSEPORT: 3330 return (0); 3331 3332 /* 3333 * Allow jailed root to set certain IPv4/6 (option) headers. 3334 */ 3335 case PRIV_NETINET_SETHDROPTS: 3336 return (0); 3337 3338 /* 3339 * Conditionally allow creating raw sockets in jail. 3340 */ 3341 case PRIV_NETINET_RAW: 3342 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3343 return (0); 3344 else 3345 return (EPERM); 3346 3347 /* 3348 * Since jail implements its own visibility limits on netstat 3349 * sysctls, allow getcred. This allows identd to work in 3350 * jail. 3351 */ 3352 case PRIV_NETINET_GETCRED: 3353 return (0); 3354 3355 /* 3356 * Allow jailed root to set loginclass. 3357 */ 3358 case PRIV_PROC_SETLOGINCLASS: 3359 return (0); 3360 3361 /* 3362 * Do not allow a process inside a jail to read the kernel 3363 * message buffer unless explicitly permitted. 3364 */ 3365 case PRIV_MSGBUF: 3366 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF) 3367 return (0); 3368 return (EPERM); 3369 3370 default: 3371 /* 3372 * In all remaining cases, deny the privilege request. This 3373 * includes almost all network privileges, many system 3374 * configuration privileges. 3375 */ 3376 return (EPERM); 3377 } 3378 } 3379 3380 /* 3381 * Return the part of pr2's name that is relative to pr1, or the whole name 3382 * if it does not directly follow. 3383 */ 3384 3385 char * 3386 prison_name(struct prison *pr1, struct prison *pr2) 3387 { 3388 char *name; 3389 3390 /* Jails see themselves as "0" (if they see themselves at all). */ 3391 if (pr1 == pr2) 3392 return "0"; 3393 name = pr2->pr_name; 3394 if (prison_ischild(pr1, pr2)) { 3395 /* 3396 * pr1 isn't locked (and allprison_lock may not be either) 3397 * so its length can't be counted on. But the number of dots 3398 * can be counted on - and counted. 3399 */ 3400 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3401 name = strchr(name, '.') + 1; 3402 } 3403 return (name); 3404 } 3405 3406 /* 3407 * Return the part of pr2's path that is relative to pr1, or the whole path 3408 * if it does not directly follow. 3409 */ 3410 static char * 3411 prison_path(struct prison *pr1, struct prison *pr2) 3412 { 3413 char *path1, *path2; 3414 int len1; 3415 3416 path1 = pr1->pr_path; 3417 path2 = pr2->pr_path; 3418 if (!strcmp(path1, "/")) 3419 return (path2); 3420 len1 = strlen(path1); 3421 if (strncmp(path1, path2, len1)) 3422 return (path2); 3423 if (path2[len1] == '\0') 3424 return "/"; 3425 if (path2[len1] == '/') 3426 return (path2 + len1); 3427 return (path2); 3428 } 3429 3430 3431 /* 3432 * Jail-related sysctls. 3433 */ 3434 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 3435 "Jails"); 3436 3437 static int 3438 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3439 { 3440 struct xprison *xp; 3441 struct prison *pr, *cpr; 3442 #ifdef INET 3443 struct in_addr *ip4 = NULL; 3444 int ip4s = 0; 3445 #endif 3446 #ifdef INET6 3447 struct in6_addr *ip6 = NULL; 3448 int ip6s = 0; 3449 #endif 3450 int descend, error; 3451 3452 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3453 pr = req->td->td_ucred->cr_prison; 3454 error = 0; 3455 sx_slock(&allprison_lock); 3456 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3457 #if defined(INET) || defined(INET6) 3458 again: 3459 #endif 3460 mtx_lock(&cpr->pr_mtx); 3461 #ifdef INET 3462 if (cpr->pr_ip4s > 0) { 3463 if (ip4s < cpr->pr_ip4s) { 3464 ip4s = cpr->pr_ip4s; 3465 mtx_unlock(&cpr->pr_mtx); 3466 ip4 = realloc(ip4, ip4s * 3467 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3468 goto again; 3469 } 3470 bcopy(cpr->pr_ip4, ip4, 3471 cpr->pr_ip4s * sizeof(struct in_addr)); 3472 } 3473 #endif 3474 #ifdef INET6 3475 if (cpr->pr_ip6s > 0) { 3476 if (ip6s < cpr->pr_ip6s) { 3477 ip6s = cpr->pr_ip6s; 3478 mtx_unlock(&cpr->pr_mtx); 3479 ip6 = realloc(ip6, ip6s * 3480 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 3481 goto again; 3482 } 3483 bcopy(cpr->pr_ip6, ip6, 3484 cpr->pr_ip6s * sizeof(struct in6_addr)); 3485 } 3486 #endif 3487 if (cpr->pr_ref == 0) { 3488 mtx_unlock(&cpr->pr_mtx); 3489 continue; 3490 } 3491 bzero(xp, sizeof(*xp)); 3492 xp->pr_version = XPRISON_VERSION; 3493 xp->pr_id = cpr->pr_id; 3494 xp->pr_state = cpr->pr_uref > 0 3495 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 3496 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 3497 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 3498 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 3499 #ifdef INET 3500 xp->pr_ip4s = cpr->pr_ip4s; 3501 #endif 3502 #ifdef INET6 3503 xp->pr_ip6s = cpr->pr_ip6s; 3504 #endif 3505 mtx_unlock(&cpr->pr_mtx); 3506 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 3507 if (error) 3508 break; 3509 #ifdef INET 3510 if (xp->pr_ip4s > 0) { 3511 error = SYSCTL_OUT(req, ip4, 3512 xp->pr_ip4s * sizeof(struct in_addr)); 3513 if (error) 3514 break; 3515 } 3516 #endif 3517 #ifdef INET6 3518 if (xp->pr_ip6s > 0) { 3519 error = SYSCTL_OUT(req, ip6, 3520 xp->pr_ip6s * sizeof(struct in6_addr)); 3521 if (error) 3522 break; 3523 } 3524 #endif 3525 } 3526 sx_sunlock(&allprison_lock); 3527 free(xp, M_TEMP); 3528 #ifdef INET 3529 free(ip4, M_TEMP); 3530 #endif 3531 #ifdef INET6 3532 free(ip6, M_TEMP); 3533 #endif 3534 return (error); 3535 } 3536 3537 SYSCTL_OID(_security_jail, OID_AUTO, list, 3538 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3539 sysctl_jail_list, "S", "List of active jails"); 3540 3541 static int 3542 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 3543 { 3544 int error, injail; 3545 3546 injail = jailed(req->td->td_ucred); 3547 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 3548 3549 return (error); 3550 } 3551 3552 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 3553 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3554 sysctl_jail_jailed, "I", "Process in jail?"); 3555 3556 static int 3557 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 3558 { 3559 int error, havevnet; 3560 #ifdef VIMAGE 3561 struct ucred *cred = req->td->td_ucred; 3562 3563 havevnet = jailed(cred) && prison_owns_vnet(cred); 3564 #else 3565 havevnet = 0; 3566 #endif 3567 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 3568 3569 return (error); 3570 } 3571 3572 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 3573 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3574 sysctl_jail_vnet, "I", "Jail owns vnet?"); 3575 3576 #if defined(INET) || defined(INET6) 3577 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 3578 &jail_max_af_ips, 0, 3579 "Number of IP addresses a jail may have at most per address family (deprecated)"); 3580 #endif 3581 3582 /* 3583 * Default parameters for jail(2) compatibility. For historical reasons, 3584 * the sysctl names have varying similarity to the parameter names. Prisons 3585 * just see their own parameters, and can't change them. 3586 */ 3587 static int 3588 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 3589 { 3590 struct prison *pr; 3591 int allow, error, i; 3592 3593 pr = req->td->td_ucred->cr_prison; 3594 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 3595 3596 /* Get the current flag value, and convert it to a boolean. */ 3597 i = (allow & arg2) ? 1 : 0; 3598 if (arg1 != NULL) 3599 i = !i; 3600 error = sysctl_handle_int(oidp, &i, 0, req); 3601 if (error || !req->newptr) 3602 return (error); 3603 i = i ? arg2 : 0; 3604 if (arg1 != NULL) 3605 i ^= arg2; 3606 /* 3607 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 3608 * for writing. 3609 */ 3610 mtx_lock(&prison0.pr_mtx); 3611 jail_default_allow = (jail_default_allow & ~arg2) | i; 3612 mtx_unlock(&prison0.pr_mtx); 3613 return (0); 3614 } 3615 3616 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 3617 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3618 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 3619 "Processes in jail can set their hostnames (deprecated)"); 3620 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 3621 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3622 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 3623 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 3624 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 3625 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3626 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 3627 "Processes in jail can use System V IPC primitives (deprecated)"); 3628 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 3629 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3630 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 3631 "Prison root can create raw sockets (deprecated)"); 3632 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 3633 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3634 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 3635 "Processes in jail can alter system file flags (deprecated)"); 3636 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 3637 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3638 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 3639 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 3640 3641 static int 3642 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 3643 { 3644 struct prison *pr; 3645 int level, error; 3646 3647 pr = req->td->td_ucred->cr_prison; 3648 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 3649 error = sysctl_handle_int(oidp, &level, 0, req); 3650 if (error || !req->newptr) 3651 return (error); 3652 *(int *)arg1 = level; 3653 return (0); 3654 } 3655 3656 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 3657 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3658 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 3659 sysctl_jail_default_level, "I", 3660 "Processes in jail cannot see all mounted file systems (deprecated)"); 3661 3662 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 3663 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 3664 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 3665 sysctl_jail_default_level, "I", 3666 "Ruleset for the devfs filesystem in jail (deprecated)"); 3667 3668 /* 3669 * Nodes to describe jail parameters. Maximum length of string parameters 3670 * is returned in the string itself, and the other parameters exist merely 3671 * to make themselves and their types known. 3672 */ 3673 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 3674 "Jail parameters"); 3675 3676 int 3677 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 3678 { 3679 int i; 3680 long l; 3681 size_t s; 3682 char numbuf[12]; 3683 3684 switch (oidp->oid_kind & CTLTYPE) 3685 { 3686 case CTLTYPE_LONG: 3687 case CTLTYPE_ULONG: 3688 l = 0; 3689 #ifdef SCTL_MASK32 3690 if (!(req->flags & SCTL_MASK32)) 3691 #endif 3692 return (SYSCTL_OUT(req, &l, sizeof(l))); 3693 case CTLTYPE_INT: 3694 case CTLTYPE_UINT: 3695 i = 0; 3696 return (SYSCTL_OUT(req, &i, sizeof(i))); 3697 case CTLTYPE_STRING: 3698 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 3699 return 3700 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 3701 case CTLTYPE_STRUCT: 3702 s = (size_t)arg2; 3703 return (SYSCTL_OUT(req, &s, sizeof(s))); 3704 } 3705 return (0); 3706 } 3707 3708 /* 3709 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 3710 * jail creation time but cannot be changed in an existing jail. 3711 */ 3712 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 3713 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 3714 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 3715 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 3716 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 3717 "I", "Jail secure level"); 3718 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 3719 "Jail value for kern.osreldate and uname -K"); 3720 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 3721 "Jail value for kern.osrelease and uname -r"); 3722 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 3723 "I", "Jail cannot see all mounted file systems"); 3724 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 3725 "I", "Ruleset for in-jail devfs mounts"); 3726 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 3727 "B", "Jail persistence"); 3728 #ifdef VIMAGE 3729 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 3730 "E,jailsys", "Virtual network stack"); 3731 #endif 3732 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 3733 "B", "Jail is in the process of shutting down"); 3734 3735 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 3736 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 3737 "I", "Current number of child jails"); 3738 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 3739 "I", "Maximum number of child jails"); 3740 3741 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 3742 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 3743 "Jail hostname"); 3744 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 3745 "Jail NIS domainname"); 3746 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 3747 "Jail host UUID"); 3748 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 3749 "LU", "Jail host ID"); 3750 3751 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 3752 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 3753 3754 #ifdef INET 3755 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 3756 "Jail IPv4 address virtualization"); 3757 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 3758 "S,in_addr,a", "Jail IPv4 addresses"); 3759 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3760 "B", "Do (not) use IPv4 source address selection rather than the " 3761 "primary jail IPv4 address."); 3762 #endif 3763 #ifdef INET6 3764 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 3765 "Jail IPv6 address virtualization"); 3766 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 3767 "S,in6_addr,a", "Jail IPv6 addresses"); 3768 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3769 "B", "Do (not) use IPv6 source address selection rather than the " 3770 "primary jail IPv6 address."); 3771 #endif 3772 3773 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 3774 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 3775 "B", "Jail may set hostname"); 3776 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 3777 "B", "Jail may use SYSV IPC"); 3778 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 3779 "B", "Jail may create raw sockets"); 3780 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 3781 "B", "Jail may alter system file flags"); 3782 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 3783 "B", "Jail may set file quotas"); 3784 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 3785 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 3786 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW, 3787 "B", "Jail may lock (unlock) physical pages in memory"); 3788 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW, 3789 "B", "Jail may bind sockets to reserved ports"); 3790 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW, 3791 "B", "Jail may read the kernel message buffer"); 3792 SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW, 3793 "B", "Unprivileged processes may use process debugging facilities"); 3794 3795 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 3796 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 3797 "B", "Jail may mount/unmount jail-friendly file systems in general"); 3798 3799 /* 3800 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return 3801 * its associated bit in the pr_allow bitmask, or zero if the parameter was 3802 * not created. 3803 */ 3804 unsigned 3805 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr, 3806 const char *descr) 3807 { 3808 struct bool_flags *bf; 3809 struct sysctl_oid *parent; 3810 char *allow_name, *allow_noname, *allowed; 3811 #ifndef NO_SYSCTL_DESCR 3812 char *descr_deprecated; 3813 #endif 3814 unsigned allow_flag; 3815 3816 if (prefix 3817 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name) 3818 < 0 || 3819 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name) 3820 < 0 3821 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 || 3822 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) { 3823 free(allow_name, M_PRISON); 3824 return 0; 3825 } 3826 3827 /* 3828 * See if this parameter has already beed added, i.e. a module was 3829 * previously loaded/unloaded. 3830 */ 3831 mtx_lock(&prison0.pr_mtx); 3832 for (bf = pr_flag_allow; 3833 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 3834 bf++) { 3835 if (strcmp(bf->name, allow_name) == 0) { 3836 allow_flag = bf->flag; 3837 goto no_add; 3838 } 3839 } 3840 3841 /* 3842 * Find a free bit in prison0's pr_allow, failing if there are none 3843 * (which shouldn't happen as long as we keep track of how many 3844 * potential dynamic flags exist). 3845 * 3846 * Due to per-jail unprivileged process debugging support 3847 * using pr_allow, also verify against PR_ALLOW_ALL_STATIC. 3848 * prison0 may have unprivileged process debugging unset. 3849 */ 3850 for (allow_flag = 1;; allow_flag <<= 1) { 3851 if (allow_flag == 0) 3852 goto no_add; 3853 if (allow_flag & PR_ALLOW_ALL_STATIC) 3854 continue; 3855 if ((prison0.pr_allow & allow_flag) == 0) 3856 break; 3857 } 3858 3859 /* 3860 * Note the parameter in the next open slot in pr_flag_allow. 3861 * Set the flag last so code that checks pr_flag_allow can do so 3862 * without locking. 3863 */ 3864 for (bf = pr_flag_allow; bf->flag != 0; bf++) 3865 if (bf == pr_flag_allow + nitems(pr_flag_allow)) { 3866 /* This should never happen, but is not fatal. */ 3867 allow_flag = 0; 3868 goto no_add; 3869 } 3870 prison0.pr_allow |= allow_flag; 3871 bf->name = allow_name; 3872 bf->noname = allow_noname; 3873 bf->flag = allow_flag; 3874 mtx_unlock(&prison0.pr_mtx); 3875 3876 /* 3877 * Create sysctls for the paramter, and the back-compat global 3878 * permission. 3879 */ 3880 parent = prefix 3881 ? SYSCTL_ADD_NODE(NULL, 3882 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow), 3883 OID_AUTO, prefix, 0, 0, prefix_descr) 3884 : &sysctl___security_jail_param_allow; 3885 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO, 3886 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3887 NULL, 0, sysctl_jail_param, "B", descr); 3888 if ((prefix 3889 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name) 3890 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) { 3891 #ifndef NO_SYSCTL_DESCR 3892 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)", 3893 descr); 3894 #endif 3895 (void)SYSCTL_ADD_PROC(NULL, 3896 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed, 3897 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag, 3898 sysctl_jail_default_allow, "I", descr_deprecated); 3899 #ifndef NO_SYSCTL_DESCR 3900 free(descr_deprecated, M_TEMP); 3901 #endif 3902 free(allowed, M_TEMP); 3903 } 3904 return allow_flag; 3905 3906 no_add: 3907 mtx_unlock(&prison0.pr_mtx); 3908 free(allow_name, M_PRISON); 3909 free(allow_noname, M_PRISON); 3910 return allow_flag; 3911 } 3912 3913 /* 3914 * The VFS system will register jail-aware filesystems here. They each get 3915 * a parameter allow.mount.xxxfs and a flag to check when a jailed user 3916 * attempts to mount. 3917 */ 3918 void 3919 prison_add_vfs(struct vfsconf *vfsp) 3920 { 3921 #ifdef NO_SYSCTL_DESCR 3922 3923 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 3924 NULL, NULL); 3925 #else 3926 char *descr; 3927 3928 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system", 3929 vfsp->vfc_name); 3930 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 3931 NULL, descr); 3932 free(descr, M_TEMP); 3933 #endif 3934 } 3935 3936 #ifdef RACCT 3937 void 3938 prison_racct_foreach(void (*callback)(struct racct *racct, 3939 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 3940 void *arg2, void *arg3) 3941 { 3942 struct prison_racct *prr; 3943 3944 ASSERT_RACCT_ENABLED(); 3945 3946 sx_slock(&allprison_lock); 3947 if (pre != NULL) 3948 (pre)(); 3949 LIST_FOREACH(prr, &allprison_racct, prr_next) 3950 (callback)(prr->prr_racct, arg2, arg3); 3951 if (post != NULL) 3952 (post)(); 3953 sx_sunlock(&allprison_lock); 3954 } 3955 3956 static struct prison_racct * 3957 prison_racct_find_locked(const char *name) 3958 { 3959 struct prison_racct *prr; 3960 3961 ASSERT_RACCT_ENABLED(); 3962 sx_assert(&allprison_lock, SA_XLOCKED); 3963 3964 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 3965 return (NULL); 3966 3967 LIST_FOREACH(prr, &allprison_racct, prr_next) { 3968 if (strcmp(name, prr->prr_name) != 0) 3969 continue; 3970 3971 /* Found prison_racct with a matching name? */ 3972 prison_racct_hold(prr); 3973 return (prr); 3974 } 3975 3976 /* Add new prison_racct. */ 3977 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 3978 racct_create(&prr->prr_racct); 3979 3980 strcpy(prr->prr_name, name); 3981 refcount_init(&prr->prr_refcount, 1); 3982 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 3983 3984 return (prr); 3985 } 3986 3987 struct prison_racct * 3988 prison_racct_find(const char *name) 3989 { 3990 struct prison_racct *prr; 3991 3992 ASSERT_RACCT_ENABLED(); 3993 3994 sx_xlock(&allprison_lock); 3995 prr = prison_racct_find_locked(name); 3996 sx_xunlock(&allprison_lock); 3997 return (prr); 3998 } 3999 4000 void 4001 prison_racct_hold(struct prison_racct *prr) 4002 { 4003 4004 ASSERT_RACCT_ENABLED(); 4005 4006 refcount_acquire(&prr->prr_refcount); 4007 } 4008 4009 static void 4010 prison_racct_free_locked(struct prison_racct *prr) 4011 { 4012 4013 ASSERT_RACCT_ENABLED(); 4014 sx_assert(&allprison_lock, SA_XLOCKED); 4015 4016 if (refcount_release(&prr->prr_refcount)) { 4017 racct_destroy(&prr->prr_racct); 4018 LIST_REMOVE(prr, prr_next); 4019 free(prr, M_PRISON_RACCT); 4020 } 4021 } 4022 4023 void 4024 prison_racct_free(struct prison_racct *prr) 4025 { 4026 int old; 4027 4028 ASSERT_RACCT_ENABLED(); 4029 sx_assert(&allprison_lock, SA_UNLOCKED); 4030 4031 old = prr->prr_refcount; 4032 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4033 return; 4034 4035 sx_xlock(&allprison_lock); 4036 prison_racct_free_locked(prr); 4037 sx_xunlock(&allprison_lock); 4038 } 4039 4040 static void 4041 prison_racct_attach(struct prison *pr) 4042 { 4043 struct prison_racct *prr; 4044 4045 ASSERT_RACCT_ENABLED(); 4046 sx_assert(&allprison_lock, SA_XLOCKED); 4047 4048 prr = prison_racct_find_locked(pr->pr_name); 4049 KASSERT(prr != NULL, ("cannot find prison_racct")); 4050 4051 pr->pr_prison_racct = prr; 4052 } 4053 4054 /* 4055 * Handle jail renaming. From the racct point of view, renaming means 4056 * moving from one prison_racct to another. 4057 */ 4058 static void 4059 prison_racct_modify(struct prison *pr) 4060 { 4061 #ifdef RCTL 4062 struct proc *p; 4063 struct ucred *cred; 4064 #endif 4065 struct prison_racct *oldprr; 4066 4067 ASSERT_RACCT_ENABLED(); 4068 4069 sx_slock(&allproc_lock); 4070 sx_xlock(&allprison_lock); 4071 4072 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4073 sx_xunlock(&allprison_lock); 4074 sx_sunlock(&allproc_lock); 4075 return; 4076 } 4077 4078 oldprr = pr->pr_prison_racct; 4079 pr->pr_prison_racct = NULL; 4080 4081 prison_racct_attach(pr); 4082 4083 /* 4084 * Move resource utilisation records. 4085 */ 4086 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4087 4088 #ifdef RCTL 4089 /* 4090 * Force rctl to reattach rules to processes. 4091 */ 4092 FOREACH_PROC_IN_SYSTEM(p) { 4093 PROC_LOCK(p); 4094 cred = crhold(p->p_ucred); 4095 PROC_UNLOCK(p); 4096 rctl_proc_ucred_changed(p, cred); 4097 crfree(cred); 4098 } 4099 #endif 4100 4101 sx_sunlock(&allproc_lock); 4102 prison_racct_free_locked(oldprr); 4103 sx_xunlock(&allprison_lock); 4104 } 4105 4106 static void 4107 prison_racct_detach(struct prison *pr) 4108 { 4109 4110 ASSERT_RACCT_ENABLED(); 4111 sx_assert(&allprison_lock, SA_UNLOCKED); 4112 4113 if (pr->pr_prison_racct == NULL) 4114 return; 4115 prison_racct_free(pr->pr_prison_racct); 4116 pr->pr_prison_racct = NULL; 4117 } 4118 #endif /* RACCT */ 4119 4120 #ifdef DDB 4121 4122 static void 4123 db_show_prison(struct prison *pr) 4124 { 4125 struct bool_flags *bf; 4126 struct jailsys_flags *jsf; 4127 #if defined(INET) || defined(INET6) 4128 int ii; 4129 #endif 4130 unsigned f; 4131 #ifdef INET 4132 char ip4buf[INET_ADDRSTRLEN]; 4133 #endif 4134 #ifdef INET6 4135 char ip6buf[INET6_ADDRSTRLEN]; 4136 #endif 4137 4138 db_printf("prison %p:\n", pr); 4139 db_printf(" jid = %d\n", pr->pr_id); 4140 db_printf(" name = %s\n", pr->pr_name); 4141 db_printf(" parent = %p\n", pr->pr_parent); 4142 db_printf(" ref = %d\n", pr->pr_ref); 4143 db_printf(" uref = %d\n", pr->pr_uref); 4144 db_printf(" path = %s\n", pr->pr_path); 4145 db_printf(" cpuset = %d\n", pr->pr_cpuset 4146 ? pr->pr_cpuset->cs_id : -1); 4147 #ifdef VIMAGE 4148 db_printf(" vnet = %p\n", pr->pr_vnet); 4149 #endif 4150 db_printf(" root = %p\n", pr->pr_root); 4151 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4152 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4153 db_printf(" children.max = %d\n", pr->pr_childmax); 4154 db_printf(" children.cur = %d\n", pr->pr_childcount); 4155 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4156 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4157 db_printf(" flags = 0x%x", pr->pr_flags); 4158 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++) 4159 if (pr->pr_flags & bf->flag) 4160 db_printf(" %s", bf->name); 4161 for (jsf = pr_flag_jailsys; 4162 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 4163 jsf++) { 4164 f = pr->pr_flags & (jsf->disable | jsf->new); 4165 db_printf(" %-16s= %s\n", jsf->name, 4166 (f != 0 && f == jsf->disable) ? "disable" 4167 : (f == jsf->new) ? "new" 4168 : "inherit"); 4169 } 4170 db_printf(" allow = 0x%x", pr->pr_allow); 4171 for (bf = pr_flag_allow; 4172 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 4173 bf++) 4174 if (pr->pr_allow & bf->flag) 4175 db_printf(" %s", bf->name); 4176 db_printf("\n"); 4177 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4178 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4179 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4180 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4181 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4182 #ifdef INET 4183 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4184 for (ii = 0; ii < pr->pr_ip4s; ii++) 4185 db_printf(" %s %s\n", 4186 ii == 0 ? "ip4.addr =" : " ", 4187 inet_ntoa_r(pr->pr_ip4[ii], ip4buf)); 4188 #endif 4189 #ifdef INET6 4190 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4191 for (ii = 0; ii < pr->pr_ip6s; ii++) 4192 db_printf(" %s %s\n", 4193 ii == 0 ? "ip6.addr =" : " ", 4194 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4195 #endif 4196 } 4197 4198 DB_SHOW_COMMAND(prison, db_show_prison_command) 4199 { 4200 struct prison *pr; 4201 4202 if (!have_addr) { 4203 /* 4204 * Show all prisons in the list, and prison0 which is not 4205 * listed. 4206 */ 4207 db_show_prison(&prison0); 4208 if (!db_pager_quit) { 4209 TAILQ_FOREACH(pr, &allprison, pr_list) { 4210 db_show_prison(pr); 4211 if (db_pager_quit) 4212 break; 4213 } 4214 } 4215 return; 4216 } 4217 4218 if (addr == 0) 4219 pr = &prison0; 4220 else { 4221 /* Look for a prison with the ID and with references. */ 4222 TAILQ_FOREACH(pr, &allprison, pr_list) 4223 if (pr->pr_id == addr && pr->pr_ref > 0) 4224 break; 4225 if (pr == NULL) 4226 /* Look again, without requiring a reference. */ 4227 TAILQ_FOREACH(pr, &allprison, pr_list) 4228 if (pr->pr_id == addr) 4229 break; 4230 if (pr == NULL) 4231 /* Assume address points to a valid prison. */ 4232 pr = (struct prison *)addr; 4233 } 4234 db_show_prison(pr); 4235 } 4236 4237 #endif /* DDB */ 4238