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/linker.h> 52 #include <sys/lock.h> 53 #include <sys/mutex.h> 54 #include <sys/racct.h> 55 #include <sys/rctl.h> 56 #include <sys/refcount.h> 57 #include <sys/sx.h> 58 #include <sys/sysent.h> 59 #include <sys/namei.h> 60 #include <sys/mount.h> 61 #include <sys/queue.h> 62 #include <sys/socket.h> 63 #include <sys/syscallsubr.h> 64 #include <sys/sysctl.h> 65 #include <sys/uuid.h> 66 #include <sys/vnode.h> 67 68 #include <net/if.h> 69 #include <net/vnet.h> 70 71 #include <netinet/in.h> 72 73 #ifdef DDB 74 #include <ddb/ddb.h> 75 #endif /* DDB */ 76 77 #include <security/mac/mac_framework.h> 78 79 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 80 #define PRISON0_HOSTUUID_MODULE "hostuuid" 81 82 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 83 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 84 85 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 86 #ifdef INET 87 #ifdef INET6 88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 89 #else 90 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 91 #endif 92 #else /* !INET */ 93 #ifdef INET6 94 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 95 #else 96 #define _PR_IP_SADDRSEL 0 97 #endif 98 #endif 99 100 /* prison0 describes what is "real" about the system. */ 101 struct prison prison0 = { 102 .pr_id = 0, 103 .pr_name = "0", 104 .pr_ref = 1, 105 .pr_uref = 1, 106 .pr_path = "/", 107 .pr_securelevel = -1, 108 .pr_devfs_rsnum = 0, 109 .pr_childmax = JAIL_MAX, 110 .pr_hostuuid = DEFAULT_HOSTUUID, 111 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 112 #ifdef VIMAGE 113 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 114 #else 115 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 116 #endif 117 .pr_allow = PR_ALLOW_ALL_STATIC, 118 }; 119 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 120 121 struct bool_flags { 122 const char *name; 123 const char *noname; 124 unsigned flag; 125 }; 126 struct jailsys_flags { 127 const char *name; 128 unsigned disable; 129 unsigned new; 130 }; 131 132 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 133 struct sx allprison_lock; 134 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 135 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 136 LIST_HEAD(, prison_racct) allprison_racct; 137 int lastprid = 0; 138 139 static int do_jail_attach(struct thread *td, struct prison *pr); 140 static void prison_complete(void *context, int pending); 141 static void prison_deref(struct prison *pr, int flags); 142 static char *prison_path(struct prison *pr1, struct prison *pr2); 143 static void prison_remove_one(struct prison *pr); 144 #ifdef RACCT 145 static void prison_racct_attach(struct prison *pr); 146 static void prison_racct_modify(struct prison *pr); 147 static void prison_racct_detach(struct prison *pr); 148 #endif 149 150 /* Flags for prison_deref */ 151 #define PD_DEREF 0x01 152 #define PD_DEUREF 0x02 153 #define PD_LOCKED 0x04 154 #define PD_LIST_SLOCKED 0x08 155 #define PD_LIST_XLOCKED 0x10 156 157 /* 158 * Parameter names corresponding to PR_* flag values. Size values are for kvm 159 * as we cannot figure out the size of a sparse array, or an array without a 160 * terminating entry. 161 */ 162 static struct bool_flags pr_flag_bool[] = { 163 {"persist", "nopersist", PR_PERSIST}, 164 #ifdef INET 165 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL}, 166 #endif 167 #ifdef INET6 168 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL}, 169 #endif 170 }; 171 const size_t pr_flag_bool_size = sizeof(pr_flag_bool); 172 173 static struct jailsys_flags pr_flag_jailsys[] = { 174 {"host", 0, PR_HOST}, 175 #ifdef VIMAGE 176 {"vnet", 0, PR_VNET}, 177 #endif 178 #ifdef INET 179 {"ip4", PR_IP4_USER, PR_IP4_USER}, 180 #endif 181 #ifdef INET6 182 {"ip6", PR_IP6_USER, PR_IP6_USER}, 183 #endif 184 }; 185 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 186 187 /* Make this array full-size so dynamic parameters can be added. */ 188 static struct bool_flags pr_flag_allow[NBBY * NBPW] = { 189 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME}, 190 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC}, 191 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS}, 192 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS}, 193 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT}, 194 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS}, 195 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF}, 196 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK}, 197 {"allow.reserved_ports", "allow.noreserved_ports", 198 PR_ALLOW_RESERVED_PORTS}, 199 {"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF}, 200 {"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug", 201 PR_ALLOW_UNPRIV_DEBUG}, 202 }; 203 const size_t pr_flag_allow_size = sizeof(pr_flag_allow); 204 205 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \ 206 PR_ALLOW_RESERVED_PORTS | \ 207 PR_ALLOW_UNPRIV_DEBUG) 208 #define JAIL_DEFAULT_ENFORCE_STATFS 2 209 #define JAIL_DEFAULT_DEVFS_RSNUM 0 210 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 211 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 212 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 213 #if defined(INET) || defined(INET6) 214 static unsigned jail_max_af_ips = 255; 215 #endif 216 217 /* 218 * Initialize the parts of prison0 that can't be static-initialized with 219 * constants. This is called from proc0_init() after creating thread0 cpuset. 220 */ 221 void 222 prison0_init(void) 223 { 224 uint8_t *file, *data; 225 size_t size; 226 227 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 228 prison0.pr_osreldate = osreldate; 229 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 230 231 /* If we have a preloaded hostuuid, use it. */ 232 file = preload_search_by_type(PRISON0_HOSTUUID_MODULE); 233 if (file != NULL) { 234 data = preload_fetch_addr(file); 235 size = preload_fetch_size(file); 236 if (data != NULL) { 237 /* 238 * The preloaded data may include trailing whitespace, almost 239 * certainly a newline; skip over any whitespace or 240 * non-printable characters to be safe. 241 */ 242 while (size > 0 && data[size - 1] <= 0x20) { 243 data[size--] = '\0'; 244 } 245 if (validate_uuid(data, size, NULL, 0) == 0) { 246 (void)strlcpy(prison0.pr_hostuuid, data, 247 size + 1); 248 } else if (bootverbose) { 249 printf("hostuuid: preload data malformed: '%s'", 250 data); 251 } 252 } 253 } 254 if (bootverbose) 255 printf("hostuuid: using %s\n", prison0.pr_hostuuid); 256 } 257 258 /* 259 * struct jail_args { 260 * struct jail *jail; 261 * }; 262 */ 263 int 264 sys_jail(struct thread *td, struct jail_args *uap) 265 { 266 uint32_t version; 267 int error; 268 struct jail j; 269 270 error = copyin(uap->jail, &version, sizeof(uint32_t)); 271 if (error) 272 return (error); 273 274 switch (version) { 275 case 0: 276 { 277 struct jail_v0 j0; 278 279 /* FreeBSD single IPv4 jails. */ 280 bzero(&j, sizeof(struct jail)); 281 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 282 if (error) 283 return (error); 284 j.version = j0.version; 285 j.path = j0.path; 286 j.hostname = j0.hostname; 287 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 288 break; 289 } 290 291 case 1: 292 /* 293 * Version 1 was used by multi-IPv4 jail implementations 294 * that never made it into the official kernel. 295 */ 296 return (EINVAL); 297 298 case 2: /* JAIL_API_VERSION */ 299 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 300 error = copyin(uap->jail, &j, sizeof(struct jail)); 301 if (error) 302 return (error); 303 break; 304 305 default: 306 /* Sci-Fi jails are not supported, sorry. */ 307 return (EINVAL); 308 } 309 return (kern_jail(td, &j)); 310 } 311 312 int 313 kern_jail(struct thread *td, struct jail *j) 314 { 315 struct iovec optiov[2 * (4 + nitems(pr_flag_allow) 316 #ifdef INET 317 + 1 318 #endif 319 #ifdef INET6 320 + 1 321 #endif 322 )]; 323 struct uio opt; 324 char *u_path, *u_hostname, *u_name; 325 struct bool_flags *bf; 326 #ifdef INET 327 uint32_t ip4s; 328 struct in_addr *u_ip4; 329 #endif 330 #ifdef INET6 331 struct in6_addr *u_ip6; 332 #endif 333 size_t tmplen; 334 int error, enforce_statfs; 335 336 bzero(&optiov, sizeof(optiov)); 337 opt.uio_iov = optiov; 338 opt.uio_iovcnt = 0; 339 opt.uio_offset = -1; 340 opt.uio_resid = -1; 341 opt.uio_segflg = UIO_SYSSPACE; 342 opt.uio_rw = UIO_READ; 343 opt.uio_td = td; 344 345 /* Set permissions for top-level jails from sysctls. */ 346 if (!jailed(td->td_ucred)) { 347 for (bf = pr_flag_allow; 348 bf < pr_flag_allow + nitems(pr_flag_allow) && 349 bf->flag != 0; 350 bf++) { 351 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *, 352 (jail_default_allow & bf->flag) 353 ? bf->name : bf->noname); 354 optiov[opt.uio_iovcnt].iov_len = 355 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 356 opt.uio_iovcnt += 2; 357 } 358 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 359 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 360 opt.uio_iovcnt++; 361 enforce_statfs = jail_default_enforce_statfs; 362 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 363 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 364 opt.uio_iovcnt++; 365 } 366 367 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 368 #ifdef INET 369 ip4s = (j->version == 0) ? 1 : j->ip4s; 370 if (ip4s > jail_max_af_ips) 371 return (EINVAL); 372 tmplen += ip4s * sizeof(struct in_addr); 373 #else 374 if (j->ip4s > 0) 375 return (EINVAL); 376 #endif 377 #ifdef INET6 378 if (j->ip6s > jail_max_af_ips) 379 return (EINVAL); 380 tmplen += j->ip6s * sizeof(struct in6_addr); 381 #else 382 if (j->ip6s > 0) 383 return (EINVAL); 384 #endif 385 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 386 u_hostname = u_path + MAXPATHLEN; 387 u_name = u_hostname + MAXHOSTNAMELEN; 388 #ifdef INET 389 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 390 #endif 391 #ifdef INET6 392 #ifdef INET 393 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 394 #else 395 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 396 #endif 397 #endif 398 optiov[opt.uio_iovcnt].iov_base = "path"; 399 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 400 opt.uio_iovcnt++; 401 optiov[opt.uio_iovcnt].iov_base = u_path; 402 error = copyinstr(j->path, u_path, MAXPATHLEN, 403 &optiov[opt.uio_iovcnt].iov_len); 404 if (error) { 405 free(u_path, M_TEMP); 406 return (error); 407 } 408 opt.uio_iovcnt++; 409 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 410 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 411 opt.uio_iovcnt++; 412 optiov[opt.uio_iovcnt].iov_base = u_hostname; 413 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 414 &optiov[opt.uio_iovcnt].iov_len); 415 if (error) { 416 free(u_path, M_TEMP); 417 return (error); 418 } 419 opt.uio_iovcnt++; 420 if (j->jailname != NULL) { 421 optiov[opt.uio_iovcnt].iov_base = "name"; 422 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 423 opt.uio_iovcnt++; 424 optiov[opt.uio_iovcnt].iov_base = u_name; 425 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 426 &optiov[opt.uio_iovcnt].iov_len); 427 if (error) { 428 free(u_path, M_TEMP); 429 return (error); 430 } 431 opt.uio_iovcnt++; 432 } 433 #ifdef INET 434 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 435 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 436 opt.uio_iovcnt++; 437 optiov[opt.uio_iovcnt].iov_base = u_ip4; 438 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 439 if (j->version == 0) 440 u_ip4->s_addr = j->ip4s; 441 else { 442 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 443 if (error) { 444 free(u_path, M_TEMP); 445 return (error); 446 } 447 } 448 opt.uio_iovcnt++; 449 #endif 450 #ifdef INET6 451 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 452 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 453 opt.uio_iovcnt++; 454 optiov[opt.uio_iovcnt].iov_base = u_ip6; 455 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 456 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 457 if (error) { 458 free(u_path, M_TEMP); 459 return (error); 460 } 461 opt.uio_iovcnt++; 462 #endif 463 KASSERT(opt.uio_iovcnt <= nitems(optiov), 464 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 465 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 466 free(u_path, M_TEMP); 467 return (error); 468 } 469 470 /* 471 * struct jail_set_args { 472 * struct iovec *iovp; 473 * unsigned int iovcnt; 474 * int flags; 475 * }; 476 */ 477 int 478 sys_jail_set(struct thread *td, struct jail_set_args *uap) 479 { 480 struct uio *auio; 481 int error; 482 483 /* Check that we have an even number of iovecs. */ 484 if (uap->iovcnt & 1) 485 return (EINVAL); 486 487 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 488 if (error) 489 return (error); 490 error = kern_jail_set(td, auio, uap->flags); 491 free(auio, M_IOV); 492 return (error); 493 } 494 495 int 496 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 497 { 498 struct nameidata nd; 499 #ifdef INET 500 struct in_addr *ip4; 501 #endif 502 #ifdef INET6 503 struct in6_addr *ip6; 504 #endif 505 struct vfsopt *opt; 506 struct vfsoptlist *opts; 507 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 508 struct vnode *root; 509 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 510 char *g_path, *osrelstr; 511 struct bool_flags *bf; 512 struct jailsys_flags *jsf; 513 #if defined(INET) || defined(INET6) 514 struct prison *tppr; 515 void *op; 516 #endif 517 unsigned long hid; 518 size_t namelen, onamelen, pnamelen; 519 int born, created, cuflags, descend, enforce; 520 int error, errmsg_len, errmsg_pos; 521 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 522 int jid, jsys, len, level; 523 int childmax, osreldt, rsnum, slevel; 524 #if defined(INET) || defined(INET6) 525 int ii, ij; 526 #endif 527 #ifdef INET 528 int ip4s, redo_ip4; 529 #endif 530 #ifdef INET6 531 int ip6s, redo_ip6; 532 #endif 533 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 534 uint64_t pr_allow_diff; 535 unsigned tallow; 536 char numbuf[12]; 537 538 error = priv_check(td, PRIV_JAIL_SET); 539 if (!error && (flags & JAIL_ATTACH)) 540 error = priv_check(td, PRIV_JAIL_ATTACH); 541 if (error) 542 return (error); 543 mypr = td->td_ucred->cr_prison; 544 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 545 return (EPERM); 546 if (flags & ~JAIL_SET_MASK) 547 return (EINVAL); 548 549 /* 550 * Check all the parameters before committing to anything. Not all 551 * errors can be caught early, but we may as well try. Also, this 552 * takes care of some expensive stuff (path lookup) before getting 553 * the allprison lock. 554 * 555 * XXX Jails are not filesystems, and jail parameters are not mount 556 * options. But it makes more sense to re-use the vfsopt code 557 * than duplicate it under a different name. 558 */ 559 error = vfs_buildopts(optuio, &opts); 560 if (error) 561 return (error); 562 #ifdef INET 563 ip4 = NULL; 564 #endif 565 #ifdef INET6 566 ip6 = NULL; 567 #endif 568 g_path = NULL; 569 570 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 571 if (!cuflags) { 572 error = EINVAL; 573 vfs_opterror(opts, "no valid operation (create or update)"); 574 goto done_errmsg; 575 } 576 577 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 578 if (error == ENOENT) 579 jid = 0; 580 else if (error != 0) 581 goto done_free; 582 583 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 584 if (error == ENOENT) 585 gotslevel = 0; 586 else if (error != 0) 587 goto done_free; 588 else 589 gotslevel = 1; 590 591 error = 592 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 593 if (error == ENOENT) 594 gotchildmax = 0; 595 else if (error != 0) 596 goto done_free; 597 else 598 gotchildmax = 1; 599 600 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 601 if (error == ENOENT) 602 gotenforce = 0; 603 else if (error != 0) 604 goto done_free; 605 else if (enforce < 0 || enforce > 2) { 606 error = EINVAL; 607 goto done_free; 608 } else 609 gotenforce = 1; 610 611 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 612 if (error == ENOENT) 613 gotrsnum = 0; 614 else if (error != 0) 615 goto done_free; 616 else 617 gotrsnum = 1; 618 619 pr_flags = ch_flags = 0; 620 for (bf = pr_flag_bool; 621 bf < pr_flag_bool + nitems(pr_flag_bool); 622 bf++) { 623 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag); 624 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag); 625 } 626 ch_flags |= pr_flags; 627 for (jsf = pr_flag_jailsys; 628 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 629 jsf++) { 630 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys)); 631 if (error == ENOENT) 632 continue; 633 if (error != 0) 634 goto done_free; 635 switch (jsys) { 636 case JAIL_SYS_DISABLE: 637 if (!jsf->disable) { 638 error = EINVAL; 639 goto done_free; 640 } 641 pr_flags |= jsf->disable; 642 break; 643 case JAIL_SYS_NEW: 644 pr_flags |= jsf->new; 645 break; 646 case JAIL_SYS_INHERIT: 647 break; 648 default: 649 error = EINVAL; 650 goto done_free; 651 } 652 ch_flags |= jsf->new | jsf->disable; 653 } 654 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 655 && !(pr_flags & PR_PERSIST)) { 656 error = EINVAL; 657 vfs_opterror(opts, "new jail must persist or attach"); 658 goto done_errmsg; 659 } 660 #ifdef VIMAGE 661 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 662 error = EINVAL; 663 vfs_opterror(opts, "vnet cannot be changed after creation"); 664 goto done_errmsg; 665 } 666 #endif 667 #ifdef INET 668 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 669 error = EINVAL; 670 vfs_opterror(opts, "ip4 cannot be changed after creation"); 671 goto done_errmsg; 672 } 673 #endif 674 #ifdef INET6 675 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 676 error = EINVAL; 677 vfs_opterror(opts, "ip6 cannot be changed after creation"); 678 goto done_errmsg; 679 } 680 #endif 681 682 pr_allow = ch_allow = 0; 683 for (bf = pr_flag_allow; 684 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 685 bf++) { 686 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag); 687 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag); 688 } 689 ch_allow |= pr_allow; 690 691 error = vfs_getopt(opts, "name", (void **)&name, &len); 692 if (error == ENOENT) 693 name = NULL; 694 else if (error != 0) 695 goto done_free; 696 else { 697 if (len == 0 || name[len - 1] != '\0') { 698 error = EINVAL; 699 goto done_free; 700 } 701 if (len > MAXHOSTNAMELEN) { 702 error = ENAMETOOLONG; 703 goto done_free; 704 } 705 } 706 707 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 708 if (error == ENOENT) 709 host = NULL; 710 else if (error != 0) 711 goto done_free; 712 else { 713 ch_flags |= PR_HOST; 714 pr_flags |= PR_HOST; 715 if (len == 0 || host[len - 1] != '\0') { 716 error = EINVAL; 717 goto done_free; 718 } 719 if (len > MAXHOSTNAMELEN) { 720 error = ENAMETOOLONG; 721 goto done_free; 722 } 723 } 724 725 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 726 if (error == ENOENT) 727 domain = NULL; 728 else if (error != 0) 729 goto done_free; 730 else { 731 ch_flags |= PR_HOST; 732 pr_flags |= PR_HOST; 733 if (len == 0 || domain[len - 1] != '\0') { 734 error = EINVAL; 735 goto done_free; 736 } 737 if (len > MAXHOSTNAMELEN) { 738 error = ENAMETOOLONG; 739 goto done_free; 740 } 741 } 742 743 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 744 if (error == ENOENT) 745 uuid = NULL; 746 else if (error != 0) 747 goto done_free; 748 else { 749 ch_flags |= PR_HOST; 750 pr_flags |= PR_HOST; 751 if (len == 0 || uuid[len - 1] != '\0') { 752 error = EINVAL; 753 goto done_free; 754 } 755 if (len > HOSTUUIDLEN) { 756 error = ENAMETOOLONG; 757 goto done_free; 758 } 759 } 760 761 #ifdef COMPAT_FREEBSD32 762 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 763 uint32_t hid32; 764 765 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 766 hid = hid32; 767 } else 768 #endif 769 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 770 if (error == ENOENT) 771 gothid = 0; 772 else if (error != 0) 773 goto done_free; 774 else { 775 gothid = 1; 776 ch_flags |= PR_HOST; 777 pr_flags |= PR_HOST; 778 } 779 780 #ifdef INET 781 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 782 if (error == ENOENT) 783 ip4s = 0; 784 else if (error != 0) 785 goto done_free; 786 else if (ip4s & (sizeof(*ip4) - 1)) { 787 error = EINVAL; 788 goto done_free; 789 } else { 790 ch_flags |= PR_IP4_USER; 791 pr_flags |= PR_IP4_USER; 792 if (ip4s > 0) { 793 ip4s /= sizeof(*ip4); 794 if (ip4s > jail_max_af_ips) { 795 error = EINVAL; 796 vfs_opterror(opts, "too many IPv4 addresses"); 797 goto done_errmsg; 798 } 799 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 800 bcopy(op, ip4, ip4s * sizeof(*ip4)); 801 /* 802 * IP addresses are all sorted but ip[0] to preserve 803 * the primary IP address as given from userland. 804 * This special IP is used for unbound outgoing 805 * connections as well for "loopback" traffic in case 806 * source address selection cannot find any more fitting 807 * address to connect from. 808 */ 809 if (ip4s > 1) 810 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), 811 prison_qcmp_v4); 812 /* 813 * Check for duplicate addresses and do some simple 814 * zero and broadcast checks. If users give other bogus 815 * addresses it is their problem. 816 * 817 * We do not have to care about byte order for these 818 * checks so we will do them in NBO. 819 */ 820 for (ii = 0; ii < ip4s; ii++) { 821 if (ip4[ii].s_addr == INADDR_ANY || 822 ip4[ii].s_addr == INADDR_BROADCAST) { 823 error = EINVAL; 824 goto done_free; 825 } 826 if ((ii+1) < ip4s && 827 (ip4[0].s_addr == ip4[ii+1].s_addr || 828 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 829 error = EINVAL; 830 goto done_free; 831 } 832 } 833 } 834 } 835 #endif 836 837 #ifdef INET6 838 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 839 if (error == ENOENT) 840 ip6s = 0; 841 else if (error != 0) 842 goto done_free; 843 else if (ip6s & (sizeof(*ip6) - 1)) { 844 error = EINVAL; 845 goto done_free; 846 } else { 847 ch_flags |= PR_IP6_USER; 848 pr_flags |= PR_IP6_USER; 849 if (ip6s > 0) { 850 ip6s /= sizeof(*ip6); 851 if (ip6s > jail_max_af_ips) { 852 error = EINVAL; 853 vfs_opterror(opts, "too many IPv6 addresses"); 854 goto done_errmsg; 855 } 856 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 857 bcopy(op, ip6, ip6s * sizeof(*ip6)); 858 if (ip6s > 1) 859 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), 860 prison_qcmp_v6); 861 for (ii = 0; ii < ip6s; ii++) { 862 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 863 error = EINVAL; 864 goto done_free; 865 } 866 if ((ii+1) < ip6s && 867 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 868 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 869 { 870 error = EINVAL; 871 goto done_free; 872 } 873 } 874 } 875 } 876 #endif 877 878 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 879 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 880 error = EINVAL; 881 vfs_opterror(opts, 882 "vnet jails cannot have IP address restrictions"); 883 goto done_errmsg; 884 } 885 #endif 886 887 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 888 if (error == ENOENT) 889 osrelstr = NULL; 890 else if (error != 0) 891 goto done_free; 892 else { 893 if (flags & JAIL_UPDATE) { 894 error = EINVAL; 895 vfs_opterror(opts, 896 "osrelease cannot be changed after creation"); 897 goto done_errmsg; 898 } 899 if (len == 0 || osrelstr[len - 1] != '\0') { 900 error = EINVAL; 901 goto done_free; 902 } 903 if (len >= OSRELEASELEN) { 904 error = ENAMETOOLONG; 905 vfs_opterror(opts, 906 "osrelease string must be 1-%d bytes long", 907 OSRELEASELEN - 1); 908 goto done_errmsg; 909 } 910 } 911 912 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 913 if (error == ENOENT) 914 osreldt = 0; 915 else if (error != 0) 916 goto done_free; 917 else { 918 if (flags & JAIL_UPDATE) { 919 error = EINVAL; 920 vfs_opterror(opts, 921 "osreldate cannot be changed after creation"); 922 goto done_errmsg; 923 } 924 if (osreldt == 0) { 925 error = EINVAL; 926 vfs_opterror(opts, "osreldate cannot be 0"); 927 goto done_errmsg; 928 } 929 } 930 931 root = NULL; 932 error = vfs_getopt(opts, "path", (void **)&path, &len); 933 if (error == ENOENT) 934 path = NULL; 935 else if (error != 0) 936 goto done_free; 937 else { 938 if (flags & JAIL_UPDATE) { 939 error = EINVAL; 940 vfs_opterror(opts, 941 "path cannot be changed after creation"); 942 goto done_errmsg; 943 } 944 if (len == 0 || path[len - 1] != '\0') { 945 error = EINVAL; 946 goto done_free; 947 } 948 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 949 path, td); 950 error = namei(&nd); 951 if (error) 952 goto done_free; 953 root = nd.ni_vp; 954 NDFREE(&nd, NDF_ONLY_PNBUF); 955 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 956 strlcpy(g_path, path, MAXPATHLEN); 957 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 958 if (error == 0) { 959 path = g_path; 960 } else { 961 /* exit on other errors */ 962 goto done_free; 963 } 964 if (root->v_type != VDIR) { 965 error = ENOTDIR; 966 vput(root); 967 goto done_free; 968 } 969 VOP_UNLOCK(root); 970 } 971 972 /* 973 * Find the specified jail, or at least its parent. 974 * This abuses the file error codes ENOENT and EEXIST. 975 */ 976 pr = NULL; 977 ppr = mypr; 978 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 979 namelc = strrchr(name, '.'); 980 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 981 if (*p != '\0') 982 jid = 0; 983 } 984 sx_xlock(&allprison_lock); 985 if (jid != 0) { 986 /* 987 * See if a requested jid already exists. There is an 988 * information leak here if the jid exists but is not within 989 * the caller's jail hierarchy. Jail creators will get EEXIST 990 * even though they cannot see the jail, and CREATE | UPDATE 991 * will return ENOENT which is not normally a valid error. 992 */ 993 if (jid < 0) { 994 error = EINVAL; 995 vfs_opterror(opts, "negative jid"); 996 goto done_unlock_list; 997 } 998 pr = prison_find(jid); 999 if (pr != NULL) { 1000 ppr = pr->pr_parent; 1001 /* Create: jid must not exist. */ 1002 if (cuflags == JAIL_CREATE) { 1003 mtx_unlock(&pr->pr_mtx); 1004 error = EEXIST; 1005 vfs_opterror(opts, "jail %d already exists", 1006 jid); 1007 goto done_unlock_list; 1008 } 1009 if (!prison_ischild(mypr, pr)) { 1010 mtx_unlock(&pr->pr_mtx); 1011 pr = NULL; 1012 } else if (pr->pr_uref == 0) { 1013 if (!(flags & JAIL_DYING)) { 1014 mtx_unlock(&pr->pr_mtx); 1015 error = ENOENT; 1016 vfs_opterror(opts, "jail %d is dying", 1017 jid); 1018 goto done_unlock_list; 1019 } else if ((flags & JAIL_ATTACH) || 1020 (pr_flags & PR_PERSIST)) { 1021 /* 1022 * A dying jail might be resurrected 1023 * (via attach or persist), but first 1024 * it must determine if another jail 1025 * has claimed its name. Accomplish 1026 * this by implicitly re-setting the 1027 * name. 1028 */ 1029 if (name == NULL) 1030 name = prison_name(mypr, pr); 1031 } 1032 } 1033 } 1034 if (pr == NULL) { 1035 /* Update: jid must exist. */ 1036 if (cuflags == JAIL_UPDATE) { 1037 error = ENOENT; 1038 vfs_opterror(opts, "jail %d not found", jid); 1039 goto done_unlock_list; 1040 } 1041 } 1042 } 1043 /* 1044 * If the caller provided a name, look for a jail by that name. 1045 * This has different semantics for creates and updates keyed by jid 1046 * (where the name must not already exist in a different jail), 1047 * and updates keyed by the name itself (where the name must exist 1048 * because that is the jail being updated). 1049 */ 1050 namelc = NULL; 1051 if (name != NULL) { 1052 namelc = strrchr(name, '.'); 1053 if (namelc == NULL) 1054 namelc = name; 1055 else { 1056 /* 1057 * This is a hierarchical name. Split it into the 1058 * parent and child names, and make sure the parent 1059 * exists or matches an already found jail. 1060 */ 1061 if (pr != NULL) { 1062 if (strncmp(name, ppr->pr_name, namelc - name) 1063 || ppr->pr_name[namelc - name] != '\0') { 1064 mtx_unlock(&pr->pr_mtx); 1065 error = EINVAL; 1066 vfs_opterror(opts, 1067 "cannot change jail's parent"); 1068 goto done_unlock_list; 1069 } 1070 } else { 1071 *namelc = '\0'; 1072 ppr = prison_find_name(mypr, name); 1073 if (ppr == NULL) { 1074 error = ENOENT; 1075 vfs_opterror(opts, 1076 "jail \"%s\" not found", name); 1077 goto done_unlock_list; 1078 } 1079 mtx_unlock(&ppr->pr_mtx); 1080 *namelc = '.'; 1081 } 1082 namelc++; 1083 } 1084 if (namelc[0] != '\0') { 1085 pnamelen = 1086 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1087 name_again: 1088 deadpr = NULL; 1089 FOREACH_PRISON_CHILD(ppr, tpr) { 1090 if (tpr != pr && tpr->pr_ref > 0 && 1091 !strcmp(tpr->pr_name + pnamelen, namelc)) { 1092 if (pr == NULL && 1093 cuflags != JAIL_CREATE) { 1094 mtx_lock(&tpr->pr_mtx); 1095 if (tpr->pr_ref > 0) { 1096 /* 1097 * Use this jail 1098 * for updates. 1099 */ 1100 if (tpr->pr_uref > 0) { 1101 pr = tpr; 1102 break; 1103 } 1104 deadpr = tpr; 1105 } 1106 mtx_unlock(&tpr->pr_mtx); 1107 } else if (tpr->pr_uref > 0) { 1108 /* 1109 * Create, or update(jid): 1110 * name must not exist in an 1111 * active sibling jail. 1112 */ 1113 error = EEXIST; 1114 if (pr != NULL) 1115 mtx_unlock(&pr->pr_mtx); 1116 vfs_opterror(opts, 1117 "jail \"%s\" already exists", 1118 name); 1119 goto done_unlock_list; 1120 } 1121 } 1122 } 1123 /* If no active jail is found, use a dying one. */ 1124 if (deadpr != NULL && pr == NULL) { 1125 if (flags & JAIL_DYING) { 1126 mtx_lock(&deadpr->pr_mtx); 1127 if (deadpr->pr_ref == 0) { 1128 mtx_unlock(&deadpr->pr_mtx); 1129 goto name_again; 1130 } 1131 pr = deadpr; 1132 } else if (cuflags == JAIL_UPDATE) { 1133 error = ENOENT; 1134 vfs_opterror(opts, 1135 "jail \"%s\" is dying", name); 1136 goto done_unlock_list; 1137 } 1138 } 1139 /* Update: name must exist if no jid. */ 1140 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1141 error = ENOENT; 1142 vfs_opterror(opts, "jail \"%s\" not found", 1143 name); 1144 goto done_unlock_list; 1145 } 1146 } 1147 } 1148 /* Update: must provide a jid or name. */ 1149 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1150 error = ENOENT; 1151 vfs_opterror(opts, "update specified no jail"); 1152 goto done_unlock_list; 1153 } 1154 1155 /* If there's no prison to update, create a new one and link it in. */ 1156 if (pr == NULL) { 1157 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1158 if (tpr->pr_childcount >= tpr->pr_childmax) { 1159 error = EPERM; 1160 vfs_opterror(opts, "prison limit exceeded"); 1161 goto done_unlock_list; 1162 } 1163 created = 1; 1164 mtx_lock(&ppr->pr_mtx); 1165 if (ppr->pr_ref == 0) { 1166 mtx_unlock(&ppr->pr_mtx); 1167 error = ENOENT; 1168 vfs_opterror(opts, "jail \"%s\" not found", 1169 prison_name(mypr, ppr)); 1170 goto done_unlock_list; 1171 } 1172 ppr->pr_ref++; 1173 ppr->pr_uref++; 1174 mtx_unlock(&ppr->pr_mtx); 1175 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1176 if (jid == 0) { 1177 /* Find the next free jid. */ 1178 jid = lastprid + 1; 1179 findnext: 1180 if (jid == JAIL_MAX) 1181 jid = 1; 1182 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1183 if (tpr->pr_id < jid) 1184 continue; 1185 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1186 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1187 break; 1188 } 1189 if (jid == lastprid) { 1190 error = EAGAIN; 1191 vfs_opterror(opts, 1192 "no available jail IDs"); 1193 free(pr, M_PRISON); 1194 prison_deref(ppr, PD_DEREF | 1195 PD_DEUREF | PD_LIST_XLOCKED); 1196 goto done_releroot; 1197 } 1198 jid++; 1199 goto findnext; 1200 } 1201 lastprid = jid; 1202 } else { 1203 /* 1204 * The jail already has a jid (that did not yet exist), 1205 * so just find where to insert it. 1206 */ 1207 TAILQ_FOREACH(tpr, &allprison, pr_list) 1208 if (tpr->pr_id >= jid) { 1209 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1210 break; 1211 } 1212 } 1213 if (tpr == NULL) 1214 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1215 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1216 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1217 tpr->pr_childcount++; 1218 1219 pr->pr_parent = ppr; 1220 pr->pr_id = jid; 1221 1222 /* Set some default values, and inherit some from the parent. */ 1223 if (namelc == NULL) 1224 namelc = ""; 1225 if (path == NULL) { 1226 path = "/"; 1227 root = mypr->pr_root; 1228 vref(root); 1229 } 1230 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1231 pr->pr_flags |= PR_HOST; 1232 #if defined(INET) || defined(INET6) 1233 #ifdef VIMAGE 1234 if (!(pr_flags & PR_VNET)) 1235 #endif 1236 { 1237 #ifdef INET 1238 if (!(ch_flags & PR_IP4_USER)) 1239 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1240 else if (!(pr_flags & PR_IP4_USER)) { 1241 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1242 if (ppr->pr_ip4 != NULL) { 1243 pr->pr_ip4s = ppr->pr_ip4s; 1244 pr->pr_ip4 = malloc(pr->pr_ip4s * 1245 sizeof(struct in_addr), M_PRISON, 1246 M_WAITOK); 1247 bcopy(ppr->pr_ip4, pr->pr_ip4, 1248 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1249 } 1250 } 1251 #endif 1252 #ifdef INET6 1253 if (!(ch_flags & PR_IP6_USER)) 1254 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1255 else if (!(pr_flags & PR_IP6_USER)) { 1256 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1257 if (ppr->pr_ip6 != NULL) { 1258 pr->pr_ip6s = ppr->pr_ip6s; 1259 pr->pr_ip6 = malloc(pr->pr_ip6s * 1260 sizeof(struct in6_addr), M_PRISON, 1261 M_WAITOK); 1262 bcopy(ppr->pr_ip6, pr->pr_ip6, 1263 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1264 } 1265 } 1266 #endif 1267 } 1268 #endif 1269 /* Source address selection is always on by default. */ 1270 pr->pr_flags |= _PR_IP_SADDRSEL; 1271 1272 pr->pr_securelevel = ppr->pr_securelevel; 1273 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1274 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1275 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1276 1277 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1278 if (osrelstr == NULL) 1279 strlcpy(pr->pr_osrelease, ppr->pr_osrelease, 1280 sizeof(pr->pr_osrelease)); 1281 else 1282 strlcpy(pr->pr_osrelease, osrelstr, 1283 sizeof(pr->pr_osrelease)); 1284 1285 LIST_INIT(&pr->pr_children); 1286 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1287 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1288 1289 #ifdef VIMAGE 1290 /* Allocate a new vnet if specified. */ 1291 pr->pr_vnet = (pr_flags & PR_VNET) 1292 ? vnet_alloc() : ppr->pr_vnet; 1293 #endif 1294 /* 1295 * Allocate a dedicated cpuset for each jail. 1296 * Unlike other initial settings, this may return an erorr. 1297 */ 1298 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1299 if (error) { 1300 prison_deref(pr, PD_LIST_XLOCKED); 1301 goto done_releroot; 1302 } 1303 1304 mtx_lock(&pr->pr_mtx); 1305 /* 1306 * New prisons do not yet have a reference, because we do not 1307 * want others to see the incomplete prison once the 1308 * allprison_lock is downgraded. 1309 */ 1310 } else { 1311 created = 0; 1312 /* 1313 * Grab a reference for existing prisons, to ensure they 1314 * continue to exist for the duration of the call. 1315 */ 1316 pr->pr_ref++; 1317 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1318 if ((pr->pr_flags & PR_VNET) && 1319 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1320 error = EINVAL; 1321 vfs_opterror(opts, 1322 "vnet jails cannot have IP address restrictions"); 1323 goto done_deref_locked; 1324 } 1325 #endif 1326 #ifdef INET 1327 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1328 error = EINVAL; 1329 vfs_opterror(opts, 1330 "ip4 cannot be changed after creation"); 1331 goto done_deref_locked; 1332 } 1333 #endif 1334 #ifdef INET6 1335 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1336 error = EINVAL; 1337 vfs_opterror(opts, 1338 "ip6 cannot be changed after creation"); 1339 goto done_deref_locked; 1340 } 1341 #endif 1342 } 1343 1344 /* Do final error checking before setting anything. */ 1345 if (gotslevel) { 1346 if (slevel < ppr->pr_securelevel) { 1347 error = EPERM; 1348 goto done_deref_locked; 1349 } 1350 } 1351 if (gotchildmax) { 1352 if (childmax >= ppr->pr_childmax) { 1353 error = EPERM; 1354 goto done_deref_locked; 1355 } 1356 } 1357 if (gotenforce) { 1358 if (enforce < ppr->pr_enforce_statfs) { 1359 error = EPERM; 1360 goto done_deref_locked; 1361 } 1362 } 1363 if (gotrsnum) { 1364 /* 1365 * devfs_rsnum is a uint16_t 1366 */ 1367 if (rsnum < 0 || rsnum > 65535) { 1368 error = EINVAL; 1369 goto done_deref_locked; 1370 } 1371 /* 1372 * Nested jails always inherit parent's devfs ruleset 1373 */ 1374 if (jailed(td->td_ucred)) { 1375 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1376 error = EPERM; 1377 goto done_deref_locked; 1378 } else 1379 rsnum = ppr->pr_devfs_rsnum; 1380 } 1381 } 1382 #ifdef INET 1383 if (ip4s > 0) { 1384 if (ppr->pr_flags & PR_IP4) { 1385 /* 1386 * Make sure the new set of IP addresses is a 1387 * subset of the parent's list. Don't worry 1388 * about the parent being unlocked, as any 1389 * setting is done with allprison_lock held. 1390 */ 1391 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1392 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1393 break; 1394 if (ij == ppr->pr_ip4s) { 1395 error = EPERM; 1396 goto done_deref_locked; 1397 } 1398 if (ip4s > 1) { 1399 for (ii = ij = 1; ii < ip4s; ii++) { 1400 if (ip4[ii].s_addr == 1401 ppr->pr_ip4[0].s_addr) 1402 continue; 1403 for (; ij < ppr->pr_ip4s; ij++) 1404 if (ip4[ii].s_addr == 1405 ppr->pr_ip4[ij].s_addr) 1406 break; 1407 if (ij == ppr->pr_ip4s) 1408 break; 1409 } 1410 if (ij == ppr->pr_ip4s) { 1411 error = EPERM; 1412 goto done_deref_locked; 1413 } 1414 } 1415 } 1416 /* 1417 * Check for conflicting IP addresses. We permit them 1418 * if there is no more than one IP on each jail. If 1419 * there is a duplicate on a jail with more than one 1420 * IP stop checking and return error. 1421 */ 1422 #ifdef VIMAGE 1423 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1424 if (tppr->pr_flags & PR_VNET) 1425 break; 1426 #else 1427 tppr = &prison0; 1428 #endif 1429 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1430 if (tpr == pr || 1431 #ifdef VIMAGE 1432 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1433 #endif 1434 tpr->pr_uref == 0) { 1435 descend = 0; 1436 continue; 1437 } 1438 if (!(tpr->pr_flags & PR_IP4_USER)) 1439 continue; 1440 descend = 0; 1441 if (tpr->pr_ip4 == NULL || 1442 (ip4s == 1 && tpr->pr_ip4s == 1)) 1443 continue; 1444 for (ii = 0; ii < ip4s; ii++) { 1445 if (prison_check_ip4_locked(tpr, &ip4[ii]) == 1446 0) { 1447 error = EADDRINUSE; 1448 vfs_opterror(opts, 1449 "IPv4 addresses clash"); 1450 goto done_deref_locked; 1451 } 1452 } 1453 } 1454 } 1455 #endif 1456 #ifdef INET6 1457 if (ip6s > 0) { 1458 if (ppr->pr_flags & PR_IP6) { 1459 /* 1460 * Make sure the new set of IP addresses is a 1461 * subset of the parent's list. 1462 */ 1463 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1464 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1465 &ppr->pr_ip6[ij])) 1466 break; 1467 if (ij == ppr->pr_ip6s) { 1468 error = EPERM; 1469 goto done_deref_locked; 1470 } 1471 if (ip6s > 1) { 1472 for (ii = ij = 1; ii < ip6s; ii++) { 1473 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1474 &ppr->pr_ip6[0])) 1475 continue; 1476 for (; ij < ppr->pr_ip6s; ij++) 1477 if (IN6_ARE_ADDR_EQUAL( 1478 &ip6[ii], &ppr->pr_ip6[ij])) 1479 break; 1480 if (ij == ppr->pr_ip6s) 1481 break; 1482 } 1483 if (ij == ppr->pr_ip6s) { 1484 error = EPERM; 1485 goto done_deref_locked; 1486 } 1487 } 1488 } 1489 /* Check for conflicting IP addresses. */ 1490 #ifdef VIMAGE 1491 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1492 if (tppr->pr_flags & PR_VNET) 1493 break; 1494 #else 1495 tppr = &prison0; 1496 #endif 1497 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1498 if (tpr == pr || 1499 #ifdef VIMAGE 1500 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1501 #endif 1502 tpr->pr_uref == 0) { 1503 descend = 0; 1504 continue; 1505 } 1506 if (!(tpr->pr_flags & PR_IP6_USER)) 1507 continue; 1508 descend = 0; 1509 if (tpr->pr_ip6 == NULL || 1510 (ip6s == 1 && tpr->pr_ip6s == 1)) 1511 continue; 1512 for (ii = 0; ii < ip6s; ii++) { 1513 if (prison_check_ip6_locked(tpr, &ip6[ii]) == 1514 0) { 1515 error = EADDRINUSE; 1516 vfs_opterror(opts, 1517 "IPv6 addresses clash"); 1518 goto done_deref_locked; 1519 } 1520 } 1521 } 1522 } 1523 #endif 1524 onamelen = namelen = 0; 1525 if (namelc != NULL) { 1526 /* Give a default name of the jid. Also allow the name to be 1527 * explicitly the jid - but not any other number, and only in 1528 * normal form (no leading zero/etc). 1529 */ 1530 if (namelc[0] == '\0') 1531 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1532 else if ((strtoul(namelc, &p, 10) != jid || 1533 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1534 error = EINVAL; 1535 vfs_opterror(opts, 1536 "name cannot be numeric (unless it is the jid)"); 1537 goto done_deref_locked; 1538 } 1539 /* 1540 * Make sure the name isn't too long for the prison or its 1541 * children. 1542 */ 1543 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1544 onamelen = strlen(pr->pr_name + pnamelen); 1545 namelen = strlen(namelc); 1546 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1547 error = ENAMETOOLONG; 1548 goto done_deref_locked; 1549 } 1550 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1551 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1552 sizeof(pr->pr_name)) { 1553 error = ENAMETOOLONG; 1554 goto done_deref_locked; 1555 } 1556 } 1557 } 1558 pr_allow_diff = pr_allow & ~ppr->pr_allow; 1559 if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) { 1560 error = EPERM; 1561 goto done_deref_locked; 1562 } 1563 1564 /* 1565 * Let modules check their parameters. This requires unlocking and 1566 * then re-locking the prison, but this is still a valid state as long 1567 * as allprison_lock remains xlocked. 1568 */ 1569 mtx_unlock(&pr->pr_mtx); 1570 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1571 if (error != 0) { 1572 prison_deref(pr, created 1573 ? PD_LIST_XLOCKED 1574 : PD_DEREF | PD_LIST_XLOCKED); 1575 goto done_releroot; 1576 } 1577 mtx_lock(&pr->pr_mtx); 1578 1579 /* At this point, all valid parameters should have been noted. */ 1580 TAILQ_FOREACH(opt, opts, link) { 1581 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1582 error = EINVAL; 1583 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1584 goto done_deref_locked; 1585 } 1586 } 1587 1588 /* Set the parameters of the prison. */ 1589 #ifdef INET 1590 redo_ip4 = 0; 1591 if (pr_flags & PR_IP4_USER) { 1592 pr->pr_flags |= PR_IP4; 1593 free(pr->pr_ip4, M_PRISON); 1594 pr->pr_ip4s = ip4s; 1595 pr->pr_ip4 = ip4; 1596 ip4 = NULL; 1597 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1598 #ifdef VIMAGE 1599 if (tpr->pr_flags & PR_VNET) { 1600 descend = 0; 1601 continue; 1602 } 1603 #endif 1604 if (prison_restrict_ip4(tpr, NULL)) { 1605 redo_ip4 = 1; 1606 descend = 0; 1607 } 1608 } 1609 } 1610 #endif 1611 #ifdef INET6 1612 redo_ip6 = 0; 1613 if (pr_flags & PR_IP6_USER) { 1614 pr->pr_flags |= PR_IP6; 1615 free(pr->pr_ip6, M_PRISON); 1616 pr->pr_ip6s = ip6s; 1617 pr->pr_ip6 = ip6; 1618 ip6 = NULL; 1619 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1620 #ifdef VIMAGE 1621 if (tpr->pr_flags & PR_VNET) { 1622 descend = 0; 1623 continue; 1624 } 1625 #endif 1626 if (prison_restrict_ip6(tpr, NULL)) { 1627 redo_ip6 = 1; 1628 descend = 0; 1629 } 1630 } 1631 } 1632 #endif 1633 if (gotslevel) { 1634 pr->pr_securelevel = slevel; 1635 /* Set all child jails to be at least this level. */ 1636 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1637 if (tpr->pr_securelevel < slevel) 1638 tpr->pr_securelevel = slevel; 1639 } 1640 if (gotchildmax) { 1641 pr->pr_childmax = childmax; 1642 /* Set all child jails to under this limit. */ 1643 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1644 if (tpr->pr_childmax > childmax - level) 1645 tpr->pr_childmax = childmax > level 1646 ? childmax - level : 0; 1647 } 1648 if (gotenforce) { 1649 pr->pr_enforce_statfs = enforce; 1650 /* Pass this restriction on to the children. */ 1651 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1652 if (tpr->pr_enforce_statfs < enforce) 1653 tpr->pr_enforce_statfs = enforce; 1654 } 1655 if (gotrsnum) { 1656 pr->pr_devfs_rsnum = rsnum; 1657 /* Pass this restriction on to the children. */ 1658 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1659 tpr->pr_devfs_rsnum = rsnum; 1660 } 1661 if (namelc != NULL) { 1662 if (ppr == &prison0) 1663 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1664 else 1665 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1666 ppr->pr_name, namelc); 1667 /* Change this component of child names. */ 1668 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1669 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1670 strlen(tpr->pr_name + onamelen) + 1); 1671 bcopy(pr->pr_name, tpr->pr_name, namelen); 1672 } 1673 } 1674 if (path != NULL) { 1675 /* Try to keep a real-rooted full pathname. */ 1676 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1677 pr->pr_root = root; 1678 } 1679 if (PR_HOST & ch_flags & ~pr_flags) { 1680 if (pr->pr_flags & PR_HOST) { 1681 /* 1682 * Copy the parent's host info. As with pr_ip4 above, 1683 * the lack of a lock on the parent is not a problem; 1684 * it is always set with allprison_lock at least 1685 * shared, and is held exclusively here. 1686 */ 1687 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1688 sizeof(pr->pr_hostname)); 1689 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1690 sizeof(pr->pr_domainname)); 1691 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1692 sizeof(pr->pr_hostuuid)); 1693 pr->pr_hostid = pr->pr_parent->pr_hostid; 1694 } 1695 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1696 /* Set this prison, and any descendants without PR_HOST. */ 1697 if (host != NULL) 1698 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1699 if (domain != NULL) 1700 strlcpy(pr->pr_domainname, domain, 1701 sizeof(pr->pr_domainname)); 1702 if (uuid != NULL) 1703 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1704 if (gothid) 1705 pr->pr_hostid = hid; 1706 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1707 if (tpr->pr_flags & PR_HOST) 1708 descend = 0; 1709 else { 1710 if (host != NULL) 1711 strlcpy(tpr->pr_hostname, 1712 pr->pr_hostname, 1713 sizeof(tpr->pr_hostname)); 1714 if (domain != NULL) 1715 strlcpy(tpr->pr_domainname, 1716 pr->pr_domainname, 1717 sizeof(tpr->pr_domainname)); 1718 if (uuid != NULL) 1719 strlcpy(tpr->pr_hostuuid, 1720 pr->pr_hostuuid, 1721 sizeof(tpr->pr_hostuuid)); 1722 if (gothid) 1723 tpr->pr_hostid = hid; 1724 } 1725 } 1726 } 1727 if ((tallow = ch_allow & ~pr_allow)) { 1728 /* Clear allow bits in all children. */ 1729 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1730 tpr->pr_allow &= ~tallow; 1731 } 1732 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1733 /* 1734 * Persistent prisons get an extra reference, and prisons losing their 1735 * persist flag lose that reference. Only do this for existing prisons 1736 * for now, so new ones will remain unseen until after the module 1737 * handlers have completed. 1738 */ 1739 born = pr->pr_uref == 0; 1740 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1741 if (pr_flags & PR_PERSIST) { 1742 pr->pr_ref++; 1743 pr->pr_uref++; 1744 } else { 1745 pr->pr_ref--; 1746 pr->pr_uref--; 1747 } 1748 } 1749 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1750 mtx_unlock(&pr->pr_mtx); 1751 1752 #ifdef RACCT 1753 if (racct_enable && created) 1754 prison_racct_attach(pr); 1755 #endif 1756 1757 /* Locks may have prevented a complete restriction of child IP 1758 * addresses. If so, allocate some more memory and try again. 1759 */ 1760 #ifdef INET 1761 while (redo_ip4) { 1762 ip4s = pr->pr_ip4s; 1763 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1764 mtx_lock(&pr->pr_mtx); 1765 redo_ip4 = 0; 1766 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1767 #ifdef VIMAGE 1768 if (tpr->pr_flags & PR_VNET) { 1769 descend = 0; 1770 continue; 1771 } 1772 #endif 1773 if (prison_restrict_ip4(tpr, ip4)) { 1774 if (ip4 != NULL) 1775 ip4 = NULL; 1776 else 1777 redo_ip4 = 1; 1778 } 1779 } 1780 mtx_unlock(&pr->pr_mtx); 1781 } 1782 #endif 1783 #ifdef INET6 1784 while (redo_ip6) { 1785 ip6s = pr->pr_ip6s; 1786 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1787 mtx_lock(&pr->pr_mtx); 1788 redo_ip6 = 0; 1789 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1790 #ifdef VIMAGE 1791 if (tpr->pr_flags & PR_VNET) { 1792 descend = 0; 1793 continue; 1794 } 1795 #endif 1796 if (prison_restrict_ip6(tpr, ip6)) { 1797 if (ip6 != NULL) 1798 ip6 = NULL; 1799 else 1800 redo_ip6 = 1; 1801 } 1802 } 1803 mtx_unlock(&pr->pr_mtx); 1804 } 1805 #endif 1806 1807 /* Let the modules do their work. */ 1808 sx_downgrade(&allprison_lock); 1809 if (born) { 1810 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1811 if (error) { 1812 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1813 prison_deref(pr, created 1814 ? PD_LIST_SLOCKED 1815 : PD_DEREF | PD_LIST_SLOCKED); 1816 goto done_errmsg; 1817 } 1818 } 1819 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1820 if (error) { 1821 if (born) 1822 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1823 prison_deref(pr, created 1824 ? PD_LIST_SLOCKED 1825 : PD_DEREF | PD_LIST_SLOCKED); 1826 goto done_errmsg; 1827 } 1828 1829 /* Attach this process to the prison if requested. */ 1830 if (flags & JAIL_ATTACH) { 1831 mtx_lock(&pr->pr_mtx); 1832 error = do_jail_attach(td, pr); 1833 if (error) { 1834 vfs_opterror(opts, "attach failed"); 1835 if (!created) 1836 prison_deref(pr, PD_DEREF); 1837 goto done_errmsg; 1838 } 1839 } 1840 1841 #ifdef RACCT 1842 if (racct_enable && !created) { 1843 if (!(flags & JAIL_ATTACH)) 1844 sx_sunlock(&allprison_lock); 1845 prison_racct_modify(pr); 1846 if (!(flags & JAIL_ATTACH)) 1847 sx_slock(&allprison_lock); 1848 } 1849 #endif 1850 1851 td->td_retval[0] = pr->pr_id; 1852 1853 /* 1854 * Now that it is all there, drop the temporary reference from existing 1855 * prisons. Or add a reference to newly created persistent prisons 1856 * (which was not done earlier so that the prison would not be publicly 1857 * visible). 1858 */ 1859 if (!created) { 1860 prison_deref(pr, (flags & JAIL_ATTACH) 1861 ? PD_DEREF 1862 : PD_DEREF | PD_LIST_SLOCKED); 1863 } else { 1864 if (pr_flags & PR_PERSIST) { 1865 mtx_lock(&pr->pr_mtx); 1866 pr->pr_ref++; 1867 pr->pr_uref++; 1868 mtx_unlock(&pr->pr_mtx); 1869 } 1870 if (!(flags & JAIL_ATTACH)) 1871 sx_sunlock(&allprison_lock); 1872 } 1873 1874 goto done_free; 1875 1876 done_deref_locked: 1877 prison_deref(pr, created 1878 ? PD_LOCKED | PD_LIST_XLOCKED 1879 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1880 goto done_releroot; 1881 done_unlock_list: 1882 sx_xunlock(&allprison_lock); 1883 done_releroot: 1884 if (root != NULL) 1885 vrele(root); 1886 done_errmsg: 1887 if (error) { 1888 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 1889 &errmsg_len) == 0 && errmsg_len > 0) { 1890 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1891 if (optuio->uio_segflg == UIO_SYSSPACE) 1892 bcopy(errmsg, 1893 optuio->uio_iov[errmsg_pos].iov_base, 1894 errmsg_len); 1895 else 1896 copyout(errmsg, 1897 optuio->uio_iov[errmsg_pos].iov_base, 1898 errmsg_len); 1899 } 1900 } 1901 done_free: 1902 #ifdef INET 1903 free(ip4, M_PRISON); 1904 #endif 1905 #ifdef INET6 1906 free(ip6, M_PRISON); 1907 #endif 1908 if (g_path != NULL) 1909 free(g_path, M_TEMP); 1910 vfs_freeopts(opts); 1911 return (error); 1912 } 1913 1914 /* 1915 * struct jail_get_args { 1916 * struct iovec *iovp; 1917 * unsigned int iovcnt; 1918 * int flags; 1919 * }; 1920 */ 1921 int 1922 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1923 { 1924 struct uio *auio; 1925 int error; 1926 1927 /* Check that we have an even number of iovecs. */ 1928 if (uap->iovcnt & 1) 1929 return (EINVAL); 1930 1931 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1932 if (error) 1933 return (error); 1934 error = kern_jail_get(td, auio, uap->flags); 1935 if (error == 0) 1936 error = copyout(auio->uio_iov, uap->iovp, 1937 uap->iovcnt * sizeof (struct iovec)); 1938 free(auio, M_IOV); 1939 return (error); 1940 } 1941 1942 int 1943 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1944 { 1945 struct bool_flags *bf; 1946 struct jailsys_flags *jsf; 1947 struct prison *pr, *mypr; 1948 struct vfsopt *opt; 1949 struct vfsoptlist *opts; 1950 char *errmsg, *name; 1951 int error, errmsg_len, errmsg_pos, i, jid, len, locked, pos; 1952 unsigned f; 1953 1954 if (flags & ~JAIL_GET_MASK) 1955 return (EINVAL); 1956 1957 /* Get the parameter list. */ 1958 error = vfs_buildopts(optuio, &opts); 1959 if (error) 1960 return (error); 1961 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1962 mypr = td->td_ucred->cr_prison; 1963 1964 /* 1965 * Find the prison specified by one of: lastjid, jid, name. 1966 */ 1967 sx_slock(&allprison_lock); 1968 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1969 if (error == 0) { 1970 TAILQ_FOREACH(pr, &allprison, pr_list) { 1971 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1972 mtx_lock(&pr->pr_mtx); 1973 if (pr->pr_ref > 0 && 1974 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1975 break; 1976 mtx_unlock(&pr->pr_mtx); 1977 } 1978 } 1979 if (pr != NULL) 1980 goto found_prison; 1981 error = ENOENT; 1982 vfs_opterror(opts, "no jail after %d", jid); 1983 goto done_unlock_list; 1984 } else if (error != ENOENT) 1985 goto done_unlock_list; 1986 1987 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1988 if (error == 0) { 1989 if (jid != 0) { 1990 pr = prison_find_child(mypr, jid); 1991 if (pr != NULL) { 1992 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1993 mtx_unlock(&pr->pr_mtx); 1994 error = ENOENT; 1995 vfs_opterror(opts, "jail %d is dying", 1996 jid); 1997 goto done_unlock_list; 1998 } 1999 goto found_prison; 2000 } 2001 error = ENOENT; 2002 vfs_opterror(opts, "jail %d not found", jid); 2003 goto done_unlock_list; 2004 } 2005 } else if (error != ENOENT) 2006 goto done_unlock_list; 2007 2008 error = vfs_getopt(opts, "name", (void **)&name, &len); 2009 if (error == 0) { 2010 if (len == 0 || name[len - 1] != '\0') { 2011 error = EINVAL; 2012 goto done_unlock_list; 2013 } 2014 pr = prison_find_name(mypr, name); 2015 if (pr != NULL) { 2016 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2017 mtx_unlock(&pr->pr_mtx); 2018 error = ENOENT; 2019 vfs_opterror(opts, "jail \"%s\" is dying", 2020 name); 2021 goto done_unlock_list; 2022 } 2023 goto found_prison; 2024 } 2025 error = ENOENT; 2026 vfs_opterror(opts, "jail \"%s\" not found", name); 2027 goto done_unlock_list; 2028 } else if (error != ENOENT) 2029 goto done_unlock_list; 2030 2031 vfs_opterror(opts, "no jail specified"); 2032 error = ENOENT; 2033 goto done_unlock_list; 2034 2035 found_prison: 2036 /* Get the parameters of the prison. */ 2037 pr->pr_ref++; 2038 locked = PD_LOCKED; 2039 td->td_retval[0] = pr->pr_id; 2040 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2041 if (error != 0 && error != ENOENT) 2042 goto done_deref; 2043 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2044 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2045 if (error != 0 && error != ENOENT) 2046 goto done_deref; 2047 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2048 if (error != 0 && error != ENOENT) 2049 goto done_deref; 2050 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2051 sizeof(pr->pr_cpuset->cs_id)); 2052 if (error != 0 && error != ENOENT) 2053 goto done_deref; 2054 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2055 if (error != 0 && error != ENOENT) 2056 goto done_deref; 2057 #ifdef INET 2058 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2059 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2060 if (error != 0 && error != ENOENT) 2061 goto done_deref; 2062 #endif 2063 #ifdef INET6 2064 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2065 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2066 if (error != 0 && error != ENOENT) 2067 goto done_deref; 2068 #endif 2069 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2070 sizeof(pr->pr_securelevel)); 2071 if (error != 0 && error != ENOENT) 2072 goto done_deref; 2073 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2074 sizeof(pr->pr_childcount)); 2075 if (error != 0 && error != ENOENT) 2076 goto done_deref; 2077 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2078 sizeof(pr->pr_childmax)); 2079 if (error != 0 && error != ENOENT) 2080 goto done_deref; 2081 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2082 if (error != 0 && error != ENOENT) 2083 goto done_deref; 2084 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2085 if (error != 0 && error != ENOENT) 2086 goto done_deref; 2087 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2088 if (error != 0 && error != ENOENT) 2089 goto done_deref; 2090 #ifdef COMPAT_FREEBSD32 2091 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2092 uint32_t hid32 = pr->pr_hostid; 2093 2094 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2095 } else 2096 #endif 2097 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2098 sizeof(pr->pr_hostid)); 2099 if (error != 0 && error != ENOENT) 2100 goto done_deref; 2101 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2102 sizeof(pr->pr_enforce_statfs)); 2103 if (error != 0 && error != ENOENT) 2104 goto done_deref; 2105 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2106 sizeof(pr->pr_devfs_rsnum)); 2107 if (error != 0 && error != ENOENT) 2108 goto done_deref; 2109 for (bf = pr_flag_bool; 2110 bf < pr_flag_bool + nitems(pr_flag_bool); 2111 bf++) { 2112 i = (pr->pr_flags & bf->flag) ? 1 : 0; 2113 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2114 if (error != 0 && error != ENOENT) 2115 goto done_deref; 2116 i = !i; 2117 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2118 if (error != 0 && error != ENOENT) 2119 goto done_deref; 2120 } 2121 for (jsf = pr_flag_jailsys; 2122 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 2123 jsf++) { 2124 f = pr->pr_flags & (jsf->disable | jsf->new); 2125 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE 2126 : (f == jsf->new) ? JAIL_SYS_NEW 2127 : JAIL_SYS_INHERIT; 2128 error = vfs_setopt(opts, jsf->name, &i, sizeof(i)); 2129 if (error != 0 && error != ENOENT) 2130 goto done_deref; 2131 } 2132 for (bf = pr_flag_allow; 2133 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 2134 bf++) { 2135 i = (pr->pr_allow & bf->flag) ? 1 : 0; 2136 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2137 if (error != 0 && error != ENOENT) 2138 goto done_deref; 2139 i = !i; 2140 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2141 if (error != 0 && error != ENOENT) 2142 goto done_deref; 2143 } 2144 i = (pr->pr_uref == 0); 2145 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2146 if (error != 0 && error != ENOENT) 2147 goto done_deref; 2148 i = !i; 2149 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2150 if (error != 0 && error != ENOENT) 2151 goto done_deref; 2152 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2153 sizeof(pr->pr_osreldate)); 2154 if (error != 0 && error != ENOENT) 2155 goto done_deref; 2156 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2157 if (error != 0 && error != ENOENT) 2158 goto done_deref; 2159 2160 /* Get the module parameters. */ 2161 mtx_unlock(&pr->pr_mtx); 2162 locked = 0; 2163 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2164 if (error) 2165 goto done_deref; 2166 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2167 2168 /* By now, all parameters should have been noted. */ 2169 TAILQ_FOREACH(opt, opts, link) { 2170 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2171 error = EINVAL; 2172 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2173 goto done_errmsg; 2174 } 2175 } 2176 2177 /* Write the fetched parameters back to userspace. */ 2178 error = 0; 2179 TAILQ_FOREACH(opt, opts, link) { 2180 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2181 pos = 2 * opt->pos + 1; 2182 optuio->uio_iov[pos].iov_len = opt->len; 2183 if (opt->value != NULL) { 2184 if (optuio->uio_segflg == UIO_SYSSPACE) { 2185 bcopy(opt->value, 2186 optuio->uio_iov[pos].iov_base, 2187 opt->len); 2188 } else { 2189 error = copyout(opt->value, 2190 optuio->uio_iov[pos].iov_base, 2191 opt->len); 2192 if (error) 2193 break; 2194 } 2195 } 2196 } 2197 } 2198 goto done_errmsg; 2199 2200 done_deref: 2201 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2202 goto done_errmsg; 2203 2204 done_unlock_list: 2205 sx_sunlock(&allprison_lock); 2206 done_errmsg: 2207 if (error && errmsg_pos >= 0) { 2208 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2209 errmsg_pos = 2 * errmsg_pos + 1; 2210 if (errmsg_len > 0) { 2211 if (optuio->uio_segflg == UIO_SYSSPACE) 2212 bcopy(errmsg, 2213 optuio->uio_iov[errmsg_pos].iov_base, 2214 errmsg_len); 2215 else 2216 copyout(errmsg, 2217 optuio->uio_iov[errmsg_pos].iov_base, 2218 errmsg_len); 2219 } 2220 } 2221 vfs_freeopts(opts); 2222 return (error); 2223 } 2224 2225 /* 2226 * struct jail_remove_args { 2227 * int jid; 2228 * }; 2229 */ 2230 int 2231 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2232 { 2233 struct prison *pr, *cpr, *lpr, *tpr; 2234 int descend, error; 2235 2236 error = priv_check(td, PRIV_JAIL_REMOVE); 2237 if (error) 2238 return (error); 2239 2240 sx_xlock(&allprison_lock); 2241 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2242 if (pr == NULL) { 2243 sx_xunlock(&allprison_lock); 2244 return (EINVAL); 2245 } 2246 2247 /* Remove all descendants of this prison, then remove this prison. */ 2248 pr->pr_ref++; 2249 if (!LIST_EMPTY(&pr->pr_children)) { 2250 mtx_unlock(&pr->pr_mtx); 2251 lpr = NULL; 2252 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2253 mtx_lock(&cpr->pr_mtx); 2254 if (cpr->pr_ref > 0) { 2255 tpr = cpr; 2256 cpr->pr_ref++; 2257 } else { 2258 /* Already removed - do not do it again. */ 2259 tpr = NULL; 2260 } 2261 mtx_unlock(&cpr->pr_mtx); 2262 if (lpr != NULL) { 2263 mtx_lock(&lpr->pr_mtx); 2264 prison_remove_one(lpr); 2265 sx_xlock(&allprison_lock); 2266 } 2267 lpr = tpr; 2268 } 2269 if (lpr != NULL) { 2270 mtx_lock(&lpr->pr_mtx); 2271 prison_remove_one(lpr); 2272 sx_xlock(&allprison_lock); 2273 } 2274 mtx_lock(&pr->pr_mtx); 2275 } 2276 prison_remove_one(pr); 2277 return (0); 2278 } 2279 2280 static void 2281 prison_remove_one(struct prison *pr) 2282 { 2283 struct proc *p; 2284 int deuref; 2285 2286 /* If the prison was persistent, it is not anymore. */ 2287 deuref = 0; 2288 if (pr->pr_flags & PR_PERSIST) { 2289 pr->pr_ref--; 2290 deuref = PD_DEUREF; 2291 pr->pr_flags &= ~PR_PERSIST; 2292 } 2293 2294 /* 2295 * jail_remove added a reference. If that's the only one, remove 2296 * the prison now. 2297 */ 2298 KASSERT(pr->pr_ref > 0, 2299 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2300 if (pr->pr_ref == 1) { 2301 prison_deref(pr, 2302 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2303 return; 2304 } 2305 2306 mtx_unlock(&pr->pr_mtx); 2307 sx_xunlock(&allprison_lock); 2308 /* 2309 * Kill all processes unfortunate enough to be attached to this prison. 2310 */ 2311 sx_slock(&allproc_lock); 2312 FOREACH_PROC_IN_SYSTEM(p) { 2313 PROC_LOCK(p); 2314 if (p->p_state != PRS_NEW && p->p_ucred && 2315 p->p_ucred->cr_prison == pr) 2316 kern_psignal(p, SIGKILL); 2317 PROC_UNLOCK(p); 2318 } 2319 sx_sunlock(&allproc_lock); 2320 /* Remove the temporary reference added by jail_remove. */ 2321 prison_deref(pr, deuref | PD_DEREF); 2322 } 2323 2324 /* 2325 * struct jail_attach_args { 2326 * int jid; 2327 * }; 2328 */ 2329 int 2330 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2331 { 2332 struct prison *pr; 2333 int error; 2334 2335 error = priv_check(td, PRIV_JAIL_ATTACH); 2336 if (error) 2337 return (error); 2338 2339 /* 2340 * Start with exclusive hold on allprison_lock to ensure that a possible 2341 * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove. 2342 * But then immediately downgrade it since we don't need to stop 2343 * readers. 2344 */ 2345 sx_xlock(&allprison_lock); 2346 sx_downgrade(&allprison_lock); 2347 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2348 if (pr == NULL) { 2349 sx_sunlock(&allprison_lock); 2350 return (EINVAL); 2351 } 2352 2353 /* 2354 * Do not allow a process to attach to a prison that is not 2355 * considered to be "alive". 2356 */ 2357 if (pr->pr_uref == 0) { 2358 mtx_unlock(&pr->pr_mtx); 2359 sx_sunlock(&allprison_lock); 2360 return (EINVAL); 2361 } 2362 2363 return (do_jail_attach(td, pr)); 2364 } 2365 2366 static int 2367 do_jail_attach(struct thread *td, struct prison *pr) 2368 { 2369 struct proc *p; 2370 struct ucred *newcred, *oldcred; 2371 int error; 2372 2373 /* 2374 * XXX: Note that there is a slight race here if two threads 2375 * in the same privileged process attempt to attach to two 2376 * different jails at the same time. It is important for 2377 * user processes not to do this, or they might end up with 2378 * a process root from one prison, but attached to the jail 2379 * of another. 2380 */ 2381 pr->pr_ref++; 2382 pr->pr_uref++; 2383 mtx_unlock(&pr->pr_mtx); 2384 2385 /* Let modules do whatever they need to prepare for attaching. */ 2386 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2387 if (error) { 2388 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2389 return (error); 2390 } 2391 sx_sunlock(&allprison_lock); 2392 2393 /* 2394 * Reparent the newly attached process to this jail. 2395 */ 2396 p = td->td_proc; 2397 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2398 if (error) 2399 goto e_revert_osd; 2400 2401 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2402 if ((error = change_dir(pr->pr_root, td)) != 0) 2403 goto e_unlock; 2404 #ifdef MAC 2405 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2406 goto e_unlock; 2407 #endif 2408 VOP_UNLOCK(pr->pr_root); 2409 if ((error = pwd_chroot(td, pr->pr_root))) 2410 goto e_revert_osd; 2411 2412 newcred = crget(); 2413 PROC_LOCK(p); 2414 oldcred = crcopysafe(p, newcred); 2415 newcred->cr_prison = pr; 2416 proc_set_cred(p, newcred); 2417 setsugid(p); 2418 #ifdef RACCT 2419 racct_proc_ucred_changed(p, oldcred, newcred); 2420 crhold(newcred); 2421 #endif 2422 PROC_UNLOCK(p); 2423 #ifdef RCTL 2424 rctl_proc_ucred_changed(p, newcred); 2425 crfree(newcred); 2426 #endif 2427 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF); 2428 crfree(oldcred); 2429 return (0); 2430 2431 e_unlock: 2432 VOP_UNLOCK(pr->pr_root); 2433 e_revert_osd: 2434 /* Tell modules this thread is still in its old jail after all. */ 2435 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2436 prison_deref(pr, PD_DEREF | PD_DEUREF); 2437 return (error); 2438 } 2439 2440 /* 2441 * Returns a locked prison instance, or NULL on failure. 2442 */ 2443 struct prison * 2444 prison_find(int prid) 2445 { 2446 struct prison *pr; 2447 2448 sx_assert(&allprison_lock, SX_LOCKED); 2449 TAILQ_FOREACH(pr, &allprison, pr_list) { 2450 if (pr->pr_id == prid) { 2451 mtx_lock(&pr->pr_mtx); 2452 if (pr->pr_ref > 0) 2453 return (pr); 2454 mtx_unlock(&pr->pr_mtx); 2455 } 2456 } 2457 return (NULL); 2458 } 2459 2460 /* 2461 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2462 */ 2463 struct prison * 2464 prison_find_child(struct prison *mypr, int prid) 2465 { 2466 struct prison *pr; 2467 int descend; 2468 2469 sx_assert(&allprison_lock, SX_LOCKED); 2470 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2471 if (pr->pr_id == prid) { 2472 mtx_lock(&pr->pr_mtx); 2473 if (pr->pr_ref > 0) 2474 return (pr); 2475 mtx_unlock(&pr->pr_mtx); 2476 } 2477 } 2478 return (NULL); 2479 } 2480 2481 /* 2482 * Look for the name relative to mypr. Returns a locked prison or NULL. 2483 */ 2484 struct prison * 2485 prison_find_name(struct prison *mypr, const char *name) 2486 { 2487 struct prison *pr, *deadpr; 2488 size_t mylen; 2489 int descend; 2490 2491 sx_assert(&allprison_lock, SX_LOCKED); 2492 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2493 again: 2494 deadpr = NULL; 2495 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2496 if (!strcmp(pr->pr_name + mylen, name)) { 2497 mtx_lock(&pr->pr_mtx); 2498 if (pr->pr_ref > 0) { 2499 if (pr->pr_uref > 0) 2500 return (pr); 2501 deadpr = pr; 2502 } 2503 mtx_unlock(&pr->pr_mtx); 2504 } 2505 } 2506 /* There was no valid prison - perhaps there was a dying one. */ 2507 if (deadpr != NULL) { 2508 mtx_lock(&deadpr->pr_mtx); 2509 if (deadpr->pr_ref == 0) { 2510 mtx_unlock(&deadpr->pr_mtx); 2511 goto again; 2512 } 2513 } 2514 return (deadpr); 2515 } 2516 2517 /* 2518 * See if a prison has the specific flag set. 2519 */ 2520 int 2521 prison_flag(struct ucred *cred, unsigned flag) 2522 { 2523 2524 /* This is an atomic read, so no locking is necessary. */ 2525 return (cred->cr_prison->pr_flags & flag); 2526 } 2527 2528 int 2529 prison_allow(struct ucred *cred, unsigned flag) 2530 { 2531 2532 /* This is an atomic read, so no locking is necessary. */ 2533 return (cred->cr_prison->pr_allow & flag); 2534 } 2535 2536 /* 2537 * Remove a prison reference. If that was the last reference, remove the 2538 * prison itself - but not in this context in case there are locks held. 2539 */ 2540 void 2541 prison_free_locked(struct prison *pr) 2542 { 2543 int ref; 2544 2545 mtx_assert(&pr->pr_mtx, MA_OWNED); 2546 ref = --pr->pr_ref; 2547 mtx_unlock(&pr->pr_mtx); 2548 if (ref == 0) 2549 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2550 } 2551 2552 void 2553 prison_free(struct prison *pr) 2554 { 2555 2556 mtx_lock(&pr->pr_mtx); 2557 prison_free_locked(pr); 2558 } 2559 2560 /* 2561 * Complete a call to either prison_free or prison_proc_free. 2562 */ 2563 static void 2564 prison_complete(void *context, int pending) 2565 { 2566 struct prison *pr = context; 2567 2568 sx_xlock(&allprison_lock); 2569 mtx_lock(&pr->pr_mtx); 2570 prison_deref(pr, pr->pr_uref 2571 ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED 2572 : PD_LOCKED | PD_LIST_XLOCKED); 2573 } 2574 2575 /* 2576 * Remove a prison reference (usually). This internal version assumes no 2577 * mutexes are held, except perhaps the prison itself. If there are no more 2578 * references, release and delist the prison. On completion, the prison lock 2579 * and the allprison lock are both unlocked. 2580 */ 2581 static void 2582 prison_deref(struct prison *pr, int flags) 2583 { 2584 struct prison *ppr, *tpr; 2585 int ref, lasturef; 2586 2587 if (!(flags & PD_LOCKED)) 2588 mtx_lock(&pr->pr_mtx); 2589 for (;;) { 2590 if (flags & PD_DEUREF) { 2591 KASSERT(pr->pr_uref > 0, 2592 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 2593 pr->pr_id)); 2594 pr->pr_uref--; 2595 lasturef = pr->pr_uref == 0; 2596 if (lasturef) 2597 pr->pr_ref++; 2598 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2599 } else 2600 lasturef = 0; 2601 if (flags & PD_DEREF) { 2602 KASSERT(pr->pr_ref > 0, 2603 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 2604 pr->pr_id)); 2605 pr->pr_ref--; 2606 } 2607 ref = pr->pr_ref; 2608 mtx_unlock(&pr->pr_mtx); 2609 2610 /* 2611 * Tell the modules if the last user reference was removed 2612 * (even it sticks around in dying state). 2613 */ 2614 if (lasturef) { 2615 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) { 2616 sx_xlock(&allprison_lock); 2617 flags |= PD_LIST_XLOCKED; 2618 } 2619 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 2620 mtx_lock(&pr->pr_mtx); 2621 ref = --pr->pr_ref; 2622 mtx_unlock(&pr->pr_mtx); 2623 } 2624 2625 /* If the prison still has references, nothing else to do. */ 2626 if (ref > 0) { 2627 if (flags & PD_LIST_SLOCKED) 2628 sx_sunlock(&allprison_lock); 2629 else if (flags & PD_LIST_XLOCKED) 2630 sx_xunlock(&allprison_lock); 2631 return; 2632 } 2633 2634 if (flags & PD_LIST_SLOCKED) { 2635 if (!sx_try_upgrade(&allprison_lock)) { 2636 sx_sunlock(&allprison_lock); 2637 sx_xlock(&allprison_lock); 2638 } 2639 } else if (!(flags & PD_LIST_XLOCKED)) 2640 sx_xlock(&allprison_lock); 2641 2642 TAILQ_REMOVE(&allprison, pr, pr_list); 2643 LIST_REMOVE(pr, pr_sibling); 2644 ppr = pr->pr_parent; 2645 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2646 tpr->pr_childcount--; 2647 sx_xunlock(&allprison_lock); 2648 2649 #ifdef VIMAGE 2650 if (pr->pr_vnet != ppr->pr_vnet) 2651 vnet_destroy(pr->pr_vnet); 2652 #endif 2653 if (pr->pr_root != NULL) 2654 vrele(pr->pr_root); 2655 mtx_destroy(&pr->pr_mtx); 2656 #ifdef INET 2657 free(pr->pr_ip4, M_PRISON); 2658 #endif 2659 #ifdef INET6 2660 free(pr->pr_ip6, M_PRISON); 2661 #endif 2662 if (pr->pr_cpuset != NULL) 2663 cpuset_rel(pr->pr_cpuset); 2664 osd_jail_exit(pr); 2665 #ifdef RACCT 2666 if (racct_enable) 2667 prison_racct_detach(pr); 2668 #endif 2669 free(pr, M_PRISON); 2670 2671 /* Removing a prison frees a reference on its parent. */ 2672 pr = ppr; 2673 mtx_lock(&pr->pr_mtx); 2674 flags = PD_DEREF | PD_DEUREF; 2675 } 2676 } 2677 2678 void 2679 prison_hold_locked(struct prison *pr) 2680 { 2681 2682 mtx_assert(&pr->pr_mtx, MA_OWNED); 2683 KASSERT(pr->pr_ref > 0, 2684 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id)); 2685 pr->pr_ref++; 2686 } 2687 2688 void 2689 prison_hold(struct prison *pr) 2690 { 2691 2692 mtx_lock(&pr->pr_mtx); 2693 prison_hold_locked(pr); 2694 mtx_unlock(&pr->pr_mtx); 2695 } 2696 2697 void 2698 prison_proc_hold(struct prison *pr) 2699 { 2700 2701 mtx_lock(&pr->pr_mtx); 2702 KASSERT(pr->pr_uref > 0, 2703 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2704 pr->pr_uref++; 2705 mtx_unlock(&pr->pr_mtx); 2706 } 2707 2708 void 2709 prison_proc_free(struct prison *pr) 2710 { 2711 2712 mtx_lock(&pr->pr_mtx); 2713 KASSERT(pr->pr_uref > 0, 2714 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2715 if (pr->pr_uref > 1) 2716 pr->pr_uref--; 2717 else { 2718 /* 2719 * Don't remove the last user reference in this context, which 2720 * is expected to be a process that is not only locked, but 2721 * also half dead. 2722 */ 2723 pr->pr_ref++; 2724 mtx_unlock(&pr->pr_mtx); 2725 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2726 return; 2727 } 2728 mtx_unlock(&pr->pr_mtx); 2729 } 2730 2731 /* 2732 * Check if a jail supports the given address family. 2733 * 2734 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 2735 * if not. 2736 */ 2737 int 2738 prison_check_af(struct ucred *cred, int af) 2739 { 2740 struct prison *pr; 2741 int error; 2742 2743 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2744 2745 pr = cred->cr_prison; 2746 #ifdef VIMAGE 2747 /* Prisons with their own network stack are not limited. */ 2748 if (prison_owns_vnet(cred)) 2749 return (0); 2750 #endif 2751 2752 error = 0; 2753 switch (af) 2754 { 2755 #ifdef INET 2756 case AF_INET: 2757 if (pr->pr_flags & PR_IP4) 2758 { 2759 mtx_lock(&pr->pr_mtx); 2760 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 2761 error = EAFNOSUPPORT; 2762 mtx_unlock(&pr->pr_mtx); 2763 } 2764 break; 2765 #endif 2766 #ifdef INET6 2767 case AF_INET6: 2768 if (pr->pr_flags & PR_IP6) 2769 { 2770 mtx_lock(&pr->pr_mtx); 2771 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 2772 error = EAFNOSUPPORT; 2773 mtx_unlock(&pr->pr_mtx); 2774 } 2775 break; 2776 #endif 2777 case AF_LOCAL: 2778 case AF_ROUTE: 2779 break; 2780 default: 2781 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 2782 error = EAFNOSUPPORT; 2783 } 2784 return (error); 2785 } 2786 2787 /* 2788 * Check if given address belongs to the jail referenced by cred (wrapper to 2789 * prison_check_ip[46]). 2790 * 2791 * Returns 0 if jail doesn't restrict the address family or if address belongs 2792 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 2793 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 2794 */ 2795 int 2796 prison_if(struct ucred *cred, const struct sockaddr *sa) 2797 { 2798 #ifdef INET 2799 const struct sockaddr_in *sai; 2800 #endif 2801 #ifdef INET6 2802 const struct sockaddr_in6 *sai6; 2803 #endif 2804 int error; 2805 2806 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2807 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 2808 2809 #ifdef VIMAGE 2810 if (prison_owns_vnet(cred)) 2811 return (0); 2812 #endif 2813 2814 error = 0; 2815 switch (sa->sa_family) 2816 { 2817 #ifdef INET 2818 case AF_INET: 2819 sai = (const struct sockaddr_in *)sa; 2820 error = prison_check_ip4(cred, &sai->sin_addr); 2821 break; 2822 #endif 2823 #ifdef INET6 2824 case AF_INET6: 2825 sai6 = (const struct sockaddr_in6 *)sa; 2826 error = prison_check_ip6(cred, &sai6->sin6_addr); 2827 break; 2828 #endif 2829 default: 2830 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 2831 error = EAFNOSUPPORT; 2832 } 2833 return (error); 2834 } 2835 2836 /* 2837 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 2838 */ 2839 int 2840 prison_check(struct ucred *cred1, struct ucred *cred2) 2841 { 2842 2843 return ((cred1->cr_prison == cred2->cr_prison || 2844 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 2845 } 2846 2847 /* 2848 * Return 1 if p2 is a child of p1, otherwise 0. 2849 */ 2850 int 2851 prison_ischild(struct prison *pr1, struct prison *pr2) 2852 { 2853 2854 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 2855 if (pr1 == pr2) 2856 return (1); 2857 return (0); 2858 } 2859 2860 /* 2861 * Return 1 if the passed credential is in a jail and that jail does not 2862 * have its own virtual network stack, otherwise 0. 2863 */ 2864 int 2865 jailed_without_vnet(struct ucred *cred) 2866 { 2867 2868 if (!jailed(cred)) 2869 return (0); 2870 #ifdef VIMAGE 2871 if (prison_owns_vnet(cred)) 2872 return (0); 2873 #endif 2874 2875 return (1); 2876 } 2877 2878 /* 2879 * Return the correct hostname (domainname, et al) for the passed credential. 2880 */ 2881 void 2882 getcredhostname(struct ucred *cred, char *buf, size_t size) 2883 { 2884 struct prison *pr; 2885 2886 /* 2887 * A NULL credential can be used to shortcut to the physical 2888 * system's hostname. 2889 */ 2890 pr = (cred != NULL) ? cred->cr_prison : &prison0; 2891 mtx_lock(&pr->pr_mtx); 2892 strlcpy(buf, pr->pr_hostname, size); 2893 mtx_unlock(&pr->pr_mtx); 2894 } 2895 2896 void 2897 getcreddomainname(struct ucred *cred, char *buf, size_t size) 2898 { 2899 2900 mtx_lock(&cred->cr_prison->pr_mtx); 2901 strlcpy(buf, cred->cr_prison->pr_domainname, size); 2902 mtx_unlock(&cred->cr_prison->pr_mtx); 2903 } 2904 2905 void 2906 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 2907 { 2908 2909 mtx_lock(&cred->cr_prison->pr_mtx); 2910 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 2911 mtx_unlock(&cred->cr_prison->pr_mtx); 2912 } 2913 2914 void 2915 getcredhostid(struct ucred *cred, unsigned long *hostid) 2916 { 2917 2918 mtx_lock(&cred->cr_prison->pr_mtx); 2919 *hostid = cred->cr_prison->pr_hostid; 2920 mtx_unlock(&cred->cr_prison->pr_mtx); 2921 } 2922 2923 void 2924 getjailname(struct ucred *cred, char *name, size_t len) 2925 { 2926 2927 mtx_lock(&cred->cr_prison->pr_mtx); 2928 strlcpy(name, cred->cr_prison->pr_name, len); 2929 mtx_unlock(&cred->cr_prison->pr_mtx); 2930 } 2931 2932 #ifdef VIMAGE 2933 /* 2934 * Determine whether the prison represented by cred owns 2935 * its vnet rather than having it inherited. 2936 * 2937 * Returns 1 in case the prison owns the vnet, 0 otherwise. 2938 */ 2939 int 2940 prison_owns_vnet(struct ucred *cred) 2941 { 2942 2943 /* 2944 * vnets cannot be added/removed after jail creation, 2945 * so no need to lock here. 2946 */ 2947 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 2948 } 2949 #endif 2950 2951 /* 2952 * Determine whether the subject represented by cred can "see" 2953 * status of a mount point. 2954 * Returns: 0 for permitted, ENOENT otherwise. 2955 * XXX: This function should be called cr_canseemount() and should be 2956 * placed in kern_prot.c. 2957 */ 2958 int 2959 prison_canseemount(struct ucred *cred, struct mount *mp) 2960 { 2961 struct prison *pr; 2962 struct statfs *sp; 2963 size_t len; 2964 2965 pr = cred->cr_prison; 2966 if (pr->pr_enforce_statfs == 0) 2967 return (0); 2968 if (pr->pr_root->v_mount == mp) 2969 return (0); 2970 if (pr->pr_enforce_statfs == 2) 2971 return (ENOENT); 2972 /* 2973 * If jail's chroot directory is set to "/" we should be able to see 2974 * all mount-points from inside a jail. 2975 * This is ugly check, but this is the only situation when jail's 2976 * directory ends with '/'. 2977 */ 2978 if (strcmp(pr->pr_path, "/") == 0) 2979 return (0); 2980 len = strlen(pr->pr_path); 2981 sp = &mp->mnt_stat; 2982 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 2983 return (ENOENT); 2984 /* 2985 * Be sure that we don't have situation where jail's root directory 2986 * is "/some/path" and mount point is "/some/pathpath". 2987 */ 2988 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 2989 return (ENOENT); 2990 return (0); 2991 } 2992 2993 void 2994 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 2995 { 2996 char jpath[MAXPATHLEN]; 2997 struct prison *pr; 2998 size_t len; 2999 3000 pr = cred->cr_prison; 3001 if (pr->pr_enforce_statfs == 0) 3002 return; 3003 if (prison_canseemount(cred, mp) != 0) { 3004 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3005 strlcpy(sp->f_mntonname, "[restricted]", 3006 sizeof(sp->f_mntonname)); 3007 return; 3008 } 3009 if (pr->pr_root->v_mount == mp) { 3010 /* 3011 * Clear current buffer data, so we are sure nothing from 3012 * the valid path left there. 3013 */ 3014 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3015 *sp->f_mntonname = '/'; 3016 return; 3017 } 3018 /* 3019 * If jail's chroot directory is set to "/" we should be able to see 3020 * all mount-points from inside a jail. 3021 */ 3022 if (strcmp(pr->pr_path, "/") == 0) 3023 return; 3024 len = strlen(pr->pr_path); 3025 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3026 /* 3027 * Clear current buffer data, so we are sure nothing from 3028 * the valid path left there. 3029 */ 3030 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3031 if (*jpath == '\0') { 3032 /* Should never happen. */ 3033 *sp->f_mntonname = '/'; 3034 } else { 3035 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3036 } 3037 } 3038 3039 /* 3040 * Check with permission for a specific privilege is granted within jail. We 3041 * have a specific list of accepted privileges; the rest are denied. 3042 */ 3043 int 3044 prison_priv_check(struct ucred *cred, int priv) 3045 { 3046 3047 /* 3048 * Some policies have custom handlers. This routine should not be 3049 * called for them. See priv_check_cred(). 3050 */ 3051 switch (priv) { 3052 case PRIV_VFS_GENERATION: 3053 KASSERT(0, ("prison_priv_check instead of a custom handler " 3054 "called for %d\n", priv)); 3055 } 3056 3057 if (!jailed(cred)) 3058 return (0); 3059 3060 #ifdef VIMAGE 3061 /* 3062 * Privileges specific to prisons with a virtual network stack. 3063 * There might be a duplicate entry here in case the privilege 3064 * is only granted conditionally in the legacy jail case. 3065 */ 3066 switch (priv) { 3067 #ifdef notyet 3068 /* 3069 * NFS-specific privileges. 3070 */ 3071 case PRIV_NFS_DAEMON: 3072 case PRIV_NFS_LOCKD: 3073 #endif 3074 /* 3075 * Network stack privileges. 3076 */ 3077 case PRIV_NET_BRIDGE: 3078 case PRIV_NET_GRE: 3079 case PRIV_NET_BPF: 3080 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3081 case PRIV_NET_ROUTE: 3082 case PRIV_NET_TAP: 3083 case PRIV_NET_SETIFMTU: 3084 case PRIV_NET_SETIFFLAGS: 3085 case PRIV_NET_SETIFCAP: 3086 case PRIV_NET_SETIFDESCR: 3087 case PRIV_NET_SETIFNAME : 3088 case PRIV_NET_SETIFMETRIC: 3089 case PRIV_NET_SETIFPHYS: 3090 case PRIV_NET_SETIFMAC: 3091 case PRIV_NET_SETLANPCP: 3092 case PRIV_NET_ADDMULTI: 3093 case PRIV_NET_DELMULTI: 3094 case PRIV_NET_HWIOCTL: 3095 case PRIV_NET_SETLLADDR: 3096 case PRIV_NET_ADDIFGROUP: 3097 case PRIV_NET_DELIFGROUP: 3098 case PRIV_NET_IFCREATE: 3099 case PRIV_NET_IFDESTROY: 3100 case PRIV_NET_ADDIFADDR: 3101 case PRIV_NET_DELIFADDR: 3102 case PRIV_NET_LAGG: 3103 case PRIV_NET_GIF: 3104 case PRIV_NET_SETIFVNET: 3105 case PRIV_NET_SETIFFIB: 3106 3107 /* 3108 * 802.11-related privileges. 3109 */ 3110 case PRIV_NET80211_GETKEY: 3111 #ifdef notyet 3112 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3113 #endif 3114 3115 #ifdef notyet 3116 /* 3117 * ATM privileges. 3118 */ 3119 case PRIV_NETATM_CFG: 3120 case PRIV_NETATM_ADD: 3121 case PRIV_NETATM_DEL: 3122 case PRIV_NETATM_SET: 3123 3124 /* 3125 * Bluetooth privileges. 3126 */ 3127 case PRIV_NETBLUETOOTH_RAW: 3128 #endif 3129 3130 /* 3131 * Netgraph and netgraph module privileges. 3132 */ 3133 case PRIV_NETGRAPH_CONTROL: 3134 #ifdef notyet 3135 case PRIV_NETGRAPH_TTY: 3136 #endif 3137 3138 /* 3139 * IPv4 and IPv6 privileges. 3140 */ 3141 case PRIV_NETINET_IPFW: 3142 case PRIV_NETINET_DIVERT: 3143 case PRIV_NETINET_PF: 3144 case PRIV_NETINET_DUMMYNET: 3145 case PRIV_NETINET_CARP: 3146 case PRIV_NETINET_MROUTE: 3147 case PRIV_NETINET_RAW: 3148 case PRIV_NETINET_ADDRCTRL6: 3149 case PRIV_NETINET_ND6: 3150 case PRIV_NETINET_SCOPE6: 3151 case PRIV_NETINET_ALIFETIME6: 3152 case PRIV_NETINET_IPSEC: 3153 case PRIV_NETINET_BINDANY: 3154 3155 #ifdef notyet 3156 /* 3157 * NCP privileges. 3158 */ 3159 case PRIV_NETNCP: 3160 3161 /* 3162 * SMB privileges. 3163 */ 3164 case PRIV_NETSMB: 3165 #endif 3166 3167 /* 3168 * No default: or deny here. 3169 * In case of no permit fall through to next switch(). 3170 */ 3171 if (cred->cr_prison->pr_flags & PR_VNET) 3172 return (0); 3173 } 3174 #endif /* VIMAGE */ 3175 3176 switch (priv) { 3177 3178 /* 3179 * Allow ktrace privileges for root in jail. 3180 */ 3181 case PRIV_KTRACE: 3182 3183 #if 0 3184 /* 3185 * Allow jailed processes to configure audit identity and 3186 * submit audit records (login, etc). In the future we may 3187 * want to further refine the relationship between audit and 3188 * jail. 3189 */ 3190 case PRIV_AUDIT_GETAUDIT: 3191 case PRIV_AUDIT_SETAUDIT: 3192 case PRIV_AUDIT_SUBMIT: 3193 #endif 3194 3195 /* 3196 * Allow jailed processes to manipulate process UNIX 3197 * credentials in any way they see fit. 3198 */ 3199 case PRIV_CRED_SETUID: 3200 case PRIV_CRED_SETEUID: 3201 case PRIV_CRED_SETGID: 3202 case PRIV_CRED_SETEGID: 3203 case PRIV_CRED_SETGROUPS: 3204 case PRIV_CRED_SETREUID: 3205 case PRIV_CRED_SETREGID: 3206 case PRIV_CRED_SETRESUID: 3207 case PRIV_CRED_SETRESGID: 3208 3209 /* 3210 * Jail implements visibility constraints already, so allow 3211 * jailed root to override uid/gid-based constraints. 3212 */ 3213 case PRIV_SEEOTHERGIDS: 3214 case PRIV_SEEOTHERUIDS: 3215 3216 /* 3217 * Jail implements inter-process debugging limits already, so 3218 * allow jailed root various debugging privileges. 3219 */ 3220 case PRIV_DEBUG_DIFFCRED: 3221 case PRIV_DEBUG_SUGID: 3222 case PRIV_DEBUG_UNPRIV: 3223 3224 /* 3225 * Allow jail to set various resource limits and login 3226 * properties, and for now, exceed process resource limits. 3227 */ 3228 case PRIV_PROC_LIMIT: 3229 case PRIV_PROC_SETLOGIN: 3230 case PRIV_PROC_SETRLIMIT: 3231 3232 /* 3233 * System V and POSIX IPC privileges are granted in jail. 3234 */ 3235 case PRIV_IPC_READ: 3236 case PRIV_IPC_WRITE: 3237 case PRIV_IPC_ADMIN: 3238 case PRIV_IPC_MSGSIZE: 3239 case PRIV_MQ_ADMIN: 3240 3241 /* 3242 * Jail operations within a jail work on child jails. 3243 */ 3244 case PRIV_JAIL_ATTACH: 3245 case PRIV_JAIL_SET: 3246 case PRIV_JAIL_REMOVE: 3247 3248 /* 3249 * Jail implements its own inter-process limits, so allow 3250 * root processes in jail to change scheduling on other 3251 * processes in the same jail. Likewise for signalling. 3252 */ 3253 case PRIV_SCHED_DIFFCRED: 3254 case PRIV_SCHED_CPUSET: 3255 case PRIV_SIGNAL_DIFFCRED: 3256 case PRIV_SIGNAL_SUGID: 3257 3258 /* 3259 * Allow jailed processes to write to sysctls marked as jail 3260 * writable. 3261 */ 3262 case PRIV_SYSCTL_WRITEJAIL: 3263 3264 /* 3265 * Allow root in jail to manage a variety of quota 3266 * properties. These should likely be conditional on a 3267 * configuration option. 3268 */ 3269 case PRIV_VFS_GETQUOTA: 3270 case PRIV_VFS_SETQUOTA: 3271 3272 /* 3273 * Since Jail relies on chroot() to implement file system 3274 * protections, grant many VFS privileges to root in jail. 3275 * Be careful to exclude mount-related and NFS-related 3276 * privileges. 3277 */ 3278 case PRIV_VFS_READ: 3279 case PRIV_VFS_WRITE: 3280 case PRIV_VFS_ADMIN: 3281 case PRIV_VFS_EXEC: 3282 case PRIV_VFS_LOOKUP: 3283 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3284 case PRIV_VFS_CHFLAGS_DEV: 3285 case PRIV_VFS_CHOWN: 3286 case PRIV_VFS_CHROOT: 3287 case PRIV_VFS_RETAINSUGID: 3288 case PRIV_VFS_FCHROOT: 3289 case PRIV_VFS_LINK: 3290 case PRIV_VFS_SETGID: 3291 case PRIV_VFS_STAT: 3292 case PRIV_VFS_STICKYFILE: 3293 3294 /* 3295 * As in the non-jail case, non-root users are expected to be 3296 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3297 * exists in the jail and they have permission to access it). 3298 */ 3299 case PRIV_KMEM_READ: 3300 return (0); 3301 3302 /* 3303 * Depending on the global setting, allow privilege of 3304 * setting system flags. 3305 */ 3306 case PRIV_VFS_SYSFLAGS: 3307 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3308 return (0); 3309 else 3310 return (EPERM); 3311 3312 /* 3313 * Depending on the global setting, allow privilege of 3314 * mounting/unmounting file systems. 3315 */ 3316 case PRIV_VFS_MOUNT: 3317 case PRIV_VFS_UNMOUNT: 3318 case PRIV_VFS_MOUNT_NONUSER: 3319 case PRIV_VFS_MOUNT_OWNER: 3320 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3321 cred->cr_prison->pr_enforce_statfs < 2) 3322 return (0); 3323 else 3324 return (EPERM); 3325 3326 /* 3327 * Jails should hold no disposition on the PRIV_VFS_READ_DIR 3328 * policy. priv_check_cred will not specifically allow it, and 3329 * we may want a MAC policy to allow it. 3330 */ 3331 case PRIV_VFS_READ_DIR: 3332 return (0); 3333 3334 /* 3335 * Conditionnaly allow locking (unlocking) physical pages 3336 * in memory. 3337 */ 3338 case PRIV_VM_MLOCK: 3339 case PRIV_VM_MUNLOCK: 3340 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK) 3341 return (0); 3342 else 3343 return (EPERM); 3344 3345 /* 3346 * Conditionally allow jailed root to bind reserved ports. 3347 */ 3348 case PRIV_NETINET_RESERVEDPORT: 3349 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS) 3350 return (0); 3351 else 3352 return (EPERM); 3353 3354 /* 3355 * Allow jailed root to reuse in-use ports. 3356 */ 3357 case PRIV_NETINET_REUSEPORT: 3358 return (0); 3359 3360 /* 3361 * Allow jailed root to set certain IPv4/6 (option) headers. 3362 */ 3363 case PRIV_NETINET_SETHDROPTS: 3364 return (0); 3365 3366 /* 3367 * Conditionally allow creating raw sockets in jail. 3368 */ 3369 case PRIV_NETINET_RAW: 3370 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3371 return (0); 3372 else 3373 return (EPERM); 3374 3375 /* 3376 * Since jail implements its own visibility limits on netstat 3377 * sysctls, allow getcred. This allows identd to work in 3378 * jail. 3379 */ 3380 case PRIV_NETINET_GETCRED: 3381 return (0); 3382 3383 /* 3384 * Allow jailed root to set loginclass. 3385 */ 3386 case PRIV_PROC_SETLOGINCLASS: 3387 return (0); 3388 3389 /* 3390 * Do not allow a process inside a jail to read the kernel 3391 * message buffer unless explicitly permitted. 3392 */ 3393 case PRIV_MSGBUF: 3394 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF) 3395 return (0); 3396 return (EPERM); 3397 3398 default: 3399 /* 3400 * In all remaining cases, deny the privilege request. This 3401 * includes almost all network privileges, many system 3402 * configuration privileges. 3403 */ 3404 return (EPERM); 3405 } 3406 } 3407 3408 /* 3409 * Return the part of pr2's name that is relative to pr1, or the whole name 3410 * if it does not directly follow. 3411 */ 3412 3413 char * 3414 prison_name(struct prison *pr1, struct prison *pr2) 3415 { 3416 char *name; 3417 3418 /* Jails see themselves as "0" (if they see themselves at all). */ 3419 if (pr1 == pr2) 3420 return "0"; 3421 name = pr2->pr_name; 3422 if (prison_ischild(pr1, pr2)) { 3423 /* 3424 * pr1 isn't locked (and allprison_lock may not be either) 3425 * so its length can't be counted on. But the number of dots 3426 * can be counted on - and counted. 3427 */ 3428 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3429 name = strchr(name, '.') + 1; 3430 } 3431 return (name); 3432 } 3433 3434 /* 3435 * Return the part of pr2's path that is relative to pr1, or the whole path 3436 * if it does not directly follow. 3437 */ 3438 static char * 3439 prison_path(struct prison *pr1, struct prison *pr2) 3440 { 3441 char *path1, *path2; 3442 int len1; 3443 3444 path1 = pr1->pr_path; 3445 path2 = pr2->pr_path; 3446 if (!strcmp(path1, "/")) 3447 return (path2); 3448 len1 = strlen(path1); 3449 if (strncmp(path1, path2, len1)) 3450 return (path2); 3451 if (path2[len1] == '\0') 3452 return "/"; 3453 if (path2[len1] == '/') 3454 return (path2 + len1); 3455 return (path2); 3456 } 3457 3458 /* 3459 * Jail-related sysctls. 3460 */ 3461 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 3462 "Jails"); 3463 3464 static int 3465 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3466 { 3467 struct xprison *xp; 3468 struct prison *pr, *cpr; 3469 #ifdef INET 3470 struct in_addr *ip4 = NULL; 3471 int ip4s = 0; 3472 #endif 3473 #ifdef INET6 3474 struct in6_addr *ip6 = NULL; 3475 int ip6s = 0; 3476 #endif 3477 int descend, error; 3478 3479 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3480 pr = req->td->td_ucred->cr_prison; 3481 error = 0; 3482 sx_slock(&allprison_lock); 3483 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3484 #if defined(INET) || defined(INET6) 3485 again: 3486 #endif 3487 mtx_lock(&cpr->pr_mtx); 3488 #ifdef INET 3489 if (cpr->pr_ip4s > 0) { 3490 if (ip4s < cpr->pr_ip4s) { 3491 ip4s = cpr->pr_ip4s; 3492 mtx_unlock(&cpr->pr_mtx); 3493 ip4 = realloc(ip4, ip4s * 3494 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3495 goto again; 3496 } 3497 bcopy(cpr->pr_ip4, ip4, 3498 cpr->pr_ip4s * sizeof(struct in_addr)); 3499 } 3500 #endif 3501 #ifdef INET6 3502 if (cpr->pr_ip6s > 0) { 3503 if (ip6s < cpr->pr_ip6s) { 3504 ip6s = cpr->pr_ip6s; 3505 mtx_unlock(&cpr->pr_mtx); 3506 ip6 = realloc(ip6, ip6s * 3507 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 3508 goto again; 3509 } 3510 bcopy(cpr->pr_ip6, ip6, 3511 cpr->pr_ip6s * sizeof(struct in6_addr)); 3512 } 3513 #endif 3514 if (cpr->pr_ref == 0) { 3515 mtx_unlock(&cpr->pr_mtx); 3516 continue; 3517 } 3518 bzero(xp, sizeof(*xp)); 3519 xp->pr_version = XPRISON_VERSION; 3520 xp->pr_id = cpr->pr_id; 3521 xp->pr_state = cpr->pr_uref > 0 3522 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 3523 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 3524 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 3525 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 3526 #ifdef INET 3527 xp->pr_ip4s = cpr->pr_ip4s; 3528 #endif 3529 #ifdef INET6 3530 xp->pr_ip6s = cpr->pr_ip6s; 3531 #endif 3532 mtx_unlock(&cpr->pr_mtx); 3533 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 3534 if (error) 3535 break; 3536 #ifdef INET 3537 if (xp->pr_ip4s > 0) { 3538 error = SYSCTL_OUT(req, ip4, 3539 xp->pr_ip4s * sizeof(struct in_addr)); 3540 if (error) 3541 break; 3542 } 3543 #endif 3544 #ifdef INET6 3545 if (xp->pr_ip6s > 0) { 3546 error = SYSCTL_OUT(req, ip6, 3547 xp->pr_ip6s * sizeof(struct in6_addr)); 3548 if (error) 3549 break; 3550 } 3551 #endif 3552 } 3553 sx_sunlock(&allprison_lock); 3554 free(xp, M_TEMP); 3555 #ifdef INET 3556 free(ip4, M_TEMP); 3557 #endif 3558 #ifdef INET6 3559 free(ip6, M_TEMP); 3560 #endif 3561 return (error); 3562 } 3563 3564 SYSCTL_OID(_security_jail, OID_AUTO, list, 3565 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3566 sysctl_jail_list, "S", "List of active jails"); 3567 3568 static int 3569 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 3570 { 3571 int error, injail; 3572 3573 injail = jailed(req->td->td_ucred); 3574 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 3575 3576 return (error); 3577 } 3578 3579 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 3580 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3581 sysctl_jail_jailed, "I", "Process in jail?"); 3582 3583 static int 3584 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 3585 { 3586 int error, havevnet; 3587 #ifdef VIMAGE 3588 struct ucred *cred = req->td->td_ucred; 3589 3590 havevnet = jailed(cred) && prison_owns_vnet(cred); 3591 #else 3592 havevnet = 0; 3593 #endif 3594 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 3595 3596 return (error); 3597 } 3598 3599 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 3600 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3601 sysctl_jail_vnet, "I", "Jail owns vnet?"); 3602 3603 #if defined(INET) || defined(INET6) 3604 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 3605 &jail_max_af_ips, 0, 3606 "Number of IP addresses a jail may have at most per address family (deprecated)"); 3607 #endif 3608 3609 /* 3610 * Default parameters for jail(2) compatibility. For historical reasons, 3611 * the sysctl names have varying similarity to the parameter names. Prisons 3612 * just see their own parameters, and can't change them. 3613 */ 3614 static int 3615 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 3616 { 3617 struct prison *pr; 3618 int allow, error, i; 3619 3620 pr = req->td->td_ucred->cr_prison; 3621 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 3622 3623 /* Get the current flag value, and convert it to a boolean. */ 3624 i = (allow & arg2) ? 1 : 0; 3625 if (arg1 != NULL) 3626 i = !i; 3627 error = sysctl_handle_int(oidp, &i, 0, req); 3628 if (error || !req->newptr) 3629 return (error); 3630 i = i ? arg2 : 0; 3631 if (arg1 != NULL) 3632 i ^= arg2; 3633 /* 3634 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 3635 * for writing. 3636 */ 3637 mtx_lock(&prison0.pr_mtx); 3638 jail_default_allow = (jail_default_allow & ~arg2) | i; 3639 mtx_unlock(&prison0.pr_mtx); 3640 return (0); 3641 } 3642 3643 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 3644 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3645 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 3646 "Processes in jail can set their hostnames (deprecated)"); 3647 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 3648 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3649 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 3650 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 3651 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 3652 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3653 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 3654 "Processes in jail can use System V IPC primitives (deprecated)"); 3655 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 3656 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3657 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 3658 "Prison root can create raw sockets (deprecated)"); 3659 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 3660 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3661 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 3662 "Processes in jail can alter system file flags (deprecated)"); 3663 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 3664 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3665 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 3666 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 3667 3668 static int 3669 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 3670 { 3671 struct prison *pr; 3672 int level, error; 3673 3674 pr = req->td->td_ucred->cr_prison; 3675 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 3676 error = sysctl_handle_int(oidp, &level, 0, req); 3677 if (error || !req->newptr) 3678 return (error); 3679 *(int *)arg1 = level; 3680 return (0); 3681 } 3682 3683 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 3684 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3685 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 3686 sysctl_jail_default_level, "I", 3687 "Processes in jail cannot see all mounted file systems (deprecated)"); 3688 3689 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 3690 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 3691 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 3692 sysctl_jail_default_level, "I", 3693 "Ruleset for the devfs filesystem in jail (deprecated)"); 3694 3695 /* 3696 * Nodes to describe jail parameters. Maximum length of string parameters 3697 * is returned in the string itself, and the other parameters exist merely 3698 * to make themselves and their types known. 3699 */ 3700 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 3701 "Jail parameters"); 3702 3703 int 3704 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 3705 { 3706 int i; 3707 long l; 3708 size_t s; 3709 char numbuf[12]; 3710 3711 switch (oidp->oid_kind & CTLTYPE) 3712 { 3713 case CTLTYPE_LONG: 3714 case CTLTYPE_ULONG: 3715 l = 0; 3716 #ifdef SCTL_MASK32 3717 if (!(req->flags & SCTL_MASK32)) 3718 #endif 3719 return (SYSCTL_OUT(req, &l, sizeof(l))); 3720 case CTLTYPE_INT: 3721 case CTLTYPE_UINT: 3722 i = 0; 3723 return (SYSCTL_OUT(req, &i, sizeof(i))); 3724 case CTLTYPE_STRING: 3725 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 3726 return 3727 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 3728 case CTLTYPE_STRUCT: 3729 s = (size_t)arg2; 3730 return (SYSCTL_OUT(req, &s, sizeof(s))); 3731 } 3732 return (0); 3733 } 3734 3735 /* 3736 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 3737 * jail creation time but cannot be changed in an existing jail. 3738 */ 3739 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 3740 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 3741 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 3742 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 3743 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 3744 "I", "Jail secure level"); 3745 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 3746 "Jail value for kern.osreldate and uname -K"); 3747 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 3748 "Jail value for kern.osrelease and uname -r"); 3749 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 3750 "I", "Jail cannot see all mounted file systems"); 3751 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 3752 "I", "Ruleset for in-jail devfs mounts"); 3753 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 3754 "B", "Jail persistence"); 3755 #ifdef VIMAGE 3756 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 3757 "E,jailsys", "Virtual network stack"); 3758 #endif 3759 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 3760 "B", "Jail is in the process of shutting down"); 3761 3762 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 3763 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 3764 "I", "Current number of child jails"); 3765 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 3766 "I", "Maximum number of child jails"); 3767 3768 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 3769 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 3770 "Jail hostname"); 3771 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 3772 "Jail NIS domainname"); 3773 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 3774 "Jail host UUID"); 3775 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 3776 "LU", "Jail host ID"); 3777 3778 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 3779 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 3780 3781 #ifdef INET 3782 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 3783 "Jail IPv4 address virtualization"); 3784 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 3785 "S,in_addr,a", "Jail IPv4 addresses"); 3786 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3787 "B", "Do (not) use IPv4 source address selection rather than the " 3788 "primary jail IPv4 address."); 3789 #endif 3790 #ifdef INET6 3791 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 3792 "Jail IPv6 address virtualization"); 3793 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 3794 "S,in6_addr,a", "Jail IPv6 addresses"); 3795 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3796 "B", "Do (not) use IPv6 source address selection rather than the " 3797 "primary jail IPv6 address."); 3798 #endif 3799 3800 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 3801 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 3802 "B", "Jail may set hostname"); 3803 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 3804 "B", "Jail may use SYSV IPC"); 3805 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 3806 "B", "Jail may create raw sockets"); 3807 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 3808 "B", "Jail may alter system file flags"); 3809 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 3810 "B", "Jail may set file quotas"); 3811 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 3812 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 3813 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW, 3814 "B", "Jail may lock (unlock) physical pages in memory"); 3815 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW, 3816 "B", "Jail may bind sockets to reserved ports"); 3817 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW, 3818 "B", "Jail may read the kernel message buffer"); 3819 SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW, 3820 "B", "Unprivileged processes may use process debugging facilities"); 3821 3822 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 3823 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 3824 "B", "Jail may mount/unmount jail-friendly file systems in general"); 3825 3826 /* 3827 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return 3828 * its associated bit in the pr_allow bitmask, or zero if the parameter was 3829 * not created. 3830 */ 3831 unsigned 3832 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr, 3833 const char *descr) 3834 { 3835 struct bool_flags *bf; 3836 struct sysctl_oid *parent; 3837 char *allow_name, *allow_noname, *allowed; 3838 #ifndef NO_SYSCTL_DESCR 3839 char *descr_deprecated; 3840 #endif 3841 unsigned allow_flag; 3842 3843 if (prefix 3844 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name) 3845 < 0 || 3846 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name) 3847 < 0 3848 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 || 3849 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) { 3850 free(allow_name, M_PRISON); 3851 return 0; 3852 } 3853 3854 /* 3855 * See if this parameter has already beed added, i.e. a module was 3856 * previously loaded/unloaded. 3857 */ 3858 mtx_lock(&prison0.pr_mtx); 3859 for (bf = pr_flag_allow; 3860 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 3861 bf++) { 3862 if (strcmp(bf->name, allow_name) == 0) { 3863 allow_flag = bf->flag; 3864 goto no_add; 3865 } 3866 } 3867 3868 /* 3869 * Find a free bit in prison0's pr_allow, failing if there are none 3870 * (which shouldn't happen as long as we keep track of how many 3871 * potential dynamic flags exist). 3872 * 3873 * Due to per-jail unprivileged process debugging support 3874 * using pr_allow, also verify against PR_ALLOW_ALL_STATIC. 3875 * prison0 may have unprivileged process debugging unset. 3876 */ 3877 for (allow_flag = 1;; allow_flag <<= 1) { 3878 if (allow_flag == 0) 3879 goto no_add; 3880 if (allow_flag & PR_ALLOW_ALL_STATIC) 3881 continue; 3882 if ((prison0.pr_allow & allow_flag) == 0) 3883 break; 3884 } 3885 3886 /* 3887 * Note the parameter in the next open slot in pr_flag_allow. 3888 * Set the flag last so code that checks pr_flag_allow can do so 3889 * without locking. 3890 */ 3891 for (bf = pr_flag_allow; bf->flag != 0; bf++) 3892 if (bf == pr_flag_allow + nitems(pr_flag_allow)) { 3893 /* This should never happen, but is not fatal. */ 3894 allow_flag = 0; 3895 goto no_add; 3896 } 3897 prison0.pr_allow |= allow_flag; 3898 bf->name = allow_name; 3899 bf->noname = allow_noname; 3900 bf->flag = allow_flag; 3901 mtx_unlock(&prison0.pr_mtx); 3902 3903 /* 3904 * Create sysctls for the paramter, and the back-compat global 3905 * permission. 3906 */ 3907 parent = prefix 3908 ? SYSCTL_ADD_NODE(NULL, 3909 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow), 3910 OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr) 3911 : &sysctl___security_jail_param_allow; 3912 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO, 3913 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3914 NULL, 0, sysctl_jail_param, "B", descr); 3915 if ((prefix 3916 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name) 3917 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) { 3918 #ifndef NO_SYSCTL_DESCR 3919 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)", 3920 descr); 3921 #endif 3922 (void)SYSCTL_ADD_PROC(NULL, 3923 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed, 3924 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag, 3925 sysctl_jail_default_allow, "I", descr_deprecated); 3926 #ifndef NO_SYSCTL_DESCR 3927 free(descr_deprecated, M_TEMP); 3928 #endif 3929 free(allowed, M_TEMP); 3930 } 3931 return allow_flag; 3932 3933 no_add: 3934 mtx_unlock(&prison0.pr_mtx); 3935 free(allow_name, M_PRISON); 3936 free(allow_noname, M_PRISON); 3937 return allow_flag; 3938 } 3939 3940 /* 3941 * The VFS system will register jail-aware filesystems here. They each get 3942 * a parameter allow.mount.xxxfs and a flag to check when a jailed user 3943 * attempts to mount. 3944 */ 3945 void 3946 prison_add_vfs(struct vfsconf *vfsp) 3947 { 3948 #ifdef NO_SYSCTL_DESCR 3949 3950 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 3951 NULL, NULL); 3952 #else 3953 char *descr; 3954 3955 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system", 3956 vfsp->vfc_name); 3957 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 3958 NULL, descr); 3959 free(descr, M_TEMP); 3960 #endif 3961 } 3962 3963 #ifdef RACCT 3964 void 3965 prison_racct_foreach(void (*callback)(struct racct *racct, 3966 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 3967 void *arg2, void *arg3) 3968 { 3969 struct prison_racct *prr; 3970 3971 ASSERT_RACCT_ENABLED(); 3972 3973 sx_slock(&allprison_lock); 3974 if (pre != NULL) 3975 (pre)(); 3976 LIST_FOREACH(prr, &allprison_racct, prr_next) 3977 (callback)(prr->prr_racct, arg2, arg3); 3978 if (post != NULL) 3979 (post)(); 3980 sx_sunlock(&allprison_lock); 3981 } 3982 3983 static struct prison_racct * 3984 prison_racct_find_locked(const char *name) 3985 { 3986 struct prison_racct *prr; 3987 3988 ASSERT_RACCT_ENABLED(); 3989 sx_assert(&allprison_lock, SA_XLOCKED); 3990 3991 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 3992 return (NULL); 3993 3994 LIST_FOREACH(prr, &allprison_racct, prr_next) { 3995 if (strcmp(name, prr->prr_name) != 0) 3996 continue; 3997 3998 /* Found prison_racct with a matching name? */ 3999 prison_racct_hold(prr); 4000 return (prr); 4001 } 4002 4003 /* Add new prison_racct. */ 4004 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4005 racct_create(&prr->prr_racct); 4006 4007 strcpy(prr->prr_name, name); 4008 refcount_init(&prr->prr_refcount, 1); 4009 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4010 4011 return (prr); 4012 } 4013 4014 struct prison_racct * 4015 prison_racct_find(const char *name) 4016 { 4017 struct prison_racct *prr; 4018 4019 ASSERT_RACCT_ENABLED(); 4020 4021 sx_xlock(&allprison_lock); 4022 prr = prison_racct_find_locked(name); 4023 sx_xunlock(&allprison_lock); 4024 return (prr); 4025 } 4026 4027 void 4028 prison_racct_hold(struct prison_racct *prr) 4029 { 4030 4031 ASSERT_RACCT_ENABLED(); 4032 4033 refcount_acquire(&prr->prr_refcount); 4034 } 4035 4036 static void 4037 prison_racct_free_locked(struct prison_racct *prr) 4038 { 4039 4040 ASSERT_RACCT_ENABLED(); 4041 sx_assert(&allprison_lock, SA_XLOCKED); 4042 4043 if (refcount_release(&prr->prr_refcount)) { 4044 racct_destroy(&prr->prr_racct); 4045 LIST_REMOVE(prr, prr_next); 4046 free(prr, M_PRISON_RACCT); 4047 } 4048 } 4049 4050 void 4051 prison_racct_free(struct prison_racct *prr) 4052 { 4053 4054 ASSERT_RACCT_ENABLED(); 4055 sx_assert(&allprison_lock, SA_UNLOCKED); 4056 4057 if (refcount_release_if_not_last(&prr->prr_refcount)) 4058 return; 4059 4060 sx_xlock(&allprison_lock); 4061 prison_racct_free_locked(prr); 4062 sx_xunlock(&allprison_lock); 4063 } 4064 4065 static void 4066 prison_racct_attach(struct prison *pr) 4067 { 4068 struct prison_racct *prr; 4069 4070 ASSERT_RACCT_ENABLED(); 4071 sx_assert(&allprison_lock, SA_XLOCKED); 4072 4073 prr = prison_racct_find_locked(pr->pr_name); 4074 KASSERT(prr != NULL, ("cannot find prison_racct")); 4075 4076 pr->pr_prison_racct = prr; 4077 } 4078 4079 /* 4080 * Handle jail renaming. From the racct point of view, renaming means 4081 * moving from one prison_racct to another. 4082 */ 4083 static void 4084 prison_racct_modify(struct prison *pr) 4085 { 4086 #ifdef RCTL 4087 struct proc *p; 4088 struct ucred *cred; 4089 #endif 4090 struct prison_racct *oldprr; 4091 4092 ASSERT_RACCT_ENABLED(); 4093 4094 sx_slock(&allproc_lock); 4095 sx_xlock(&allprison_lock); 4096 4097 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4098 sx_xunlock(&allprison_lock); 4099 sx_sunlock(&allproc_lock); 4100 return; 4101 } 4102 4103 oldprr = pr->pr_prison_racct; 4104 pr->pr_prison_racct = NULL; 4105 4106 prison_racct_attach(pr); 4107 4108 /* 4109 * Move resource utilisation records. 4110 */ 4111 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4112 4113 #ifdef RCTL 4114 /* 4115 * Force rctl to reattach rules to processes. 4116 */ 4117 FOREACH_PROC_IN_SYSTEM(p) { 4118 PROC_LOCK(p); 4119 cred = crhold(p->p_ucred); 4120 PROC_UNLOCK(p); 4121 rctl_proc_ucred_changed(p, cred); 4122 crfree(cred); 4123 } 4124 #endif 4125 4126 sx_sunlock(&allproc_lock); 4127 prison_racct_free_locked(oldprr); 4128 sx_xunlock(&allprison_lock); 4129 } 4130 4131 static void 4132 prison_racct_detach(struct prison *pr) 4133 { 4134 4135 ASSERT_RACCT_ENABLED(); 4136 sx_assert(&allprison_lock, SA_UNLOCKED); 4137 4138 if (pr->pr_prison_racct == NULL) 4139 return; 4140 prison_racct_free(pr->pr_prison_racct); 4141 pr->pr_prison_racct = NULL; 4142 } 4143 #endif /* RACCT */ 4144 4145 #ifdef DDB 4146 4147 static void 4148 db_show_prison(struct prison *pr) 4149 { 4150 struct bool_flags *bf; 4151 struct jailsys_flags *jsf; 4152 #if defined(INET) || defined(INET6) 4153 int ii; 4154 #endif 4155 unsigned f; 4156 #ifdef INET 4157 char ip4buf[INET_ADDRSTRLEN]; 4158 #endif 4159 #ifdef INET6 4160 char ip6buf[INET6_ADDRSTRLEN]; 4161 #endif 4162 4163 db_printf("prison %p:\n", pr); 4164 db_printf(" jid = %d\n", pr->pr_id); 4165 db_printf(" name = %s\n", pr->pr_name); 4166 db_printf(" parent = %p\n", pr->pr_parent); 4167 db_printf(" ref = %d\n", pr->pr_ref); 4168 db_printf(" uref = %d\n", pr->pr_uref); 4169 db_printf(" path = %s\n", pr->pr_path); 4170 db_printf(" cpuset = %d\n", pr->pr_cpuset 4171 ? pr->pr_cpuset->cs_id : -1); 4172 #ifdef VIMAGE 4173 db_printf(" vnet = %p\n", pr->pr_vnet); 4174 #endif 4175 db_printf(" root = %p\n", pr->pr_root); 4176 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4177 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4178 db_printf(" children.max = %d\n", pr->pr_childmax); 4179 db_printf(" children.cur = %d\n", pr->pr_childcount); 4180 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4181 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4182 db_printf(" flags = 0x%x", pr->pr_flags); 4183 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++) 4184 if (pr->pr_flags & bf->flag) 4185 db_printf(" %s", bf->name); 4186 for (jsf = pr_flag_jailsys; 4187 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 4188 jsf++) { 4189 f = pr->pr_flags & (jsf->disable | jsf->new); 4190 db_printf(" %-16s= %s\n", jsf->name, 4191 (f != 0 && f == jsf->disable) ? "disable" 4192 : (f == jsf->new) ? "new" 4193 : "inherit"); 4194 } 4195 db_printf(" allow = 0x%x", pr->pr_allow); 4196 for (bf = pr_flag_allow; 4197 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 4198 bf++) 4199 if (pr->pr_allow & bf->flag) 4200 db_printf(" %s", bf->name); 4201 db_printf("\n"); 4202 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4203 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4204 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4205 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4206 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4207 #ifdef INET 4208 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4209 for (ii = 0; ii < pr->pr_ip4s; ii++) 4210 db_printf(" %s %s\n", 4211 ii == 0 ? "ip4.addr =" : " ", 4212 inet_ntoa_r(pr->pr_ip4[ii], ip4buf)); 4213 #endif 4214 #ifdef INET6 4215 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4216 for (ii = 0; ii < pr->pr_ip6s; ii++) 4217 db_printf(" %s %s\n", 4218 ii == 0 ? "ip6.addr =" : " ", 4219 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4220 #endif 4221 } 4222 4223 DB_SHOW_COMMAND(prison, db_show_prison_command) 4224 { 4225 struct prison *pr; 4226 4227 if (!have_addr) { 4228 /* 4229 * Show all prisons in the list, and prison0 which is not 4230 * listed. 4231 */ 4232 db_show_prison(&prison0); 4233 if (!db_pager_quit) { 4234 TAILQ_FOREACH(pr, &allprison, pr_list) { 4235 db_show_prison(pr); 4236 if (db_pager_quit) 4237 break; 4238 } 4239 } 4240 return; 4241 } 4242 4243 if (addr == 0) 4244 pr = &prison0; 4245 else { 4246 /* Look for a prison with the ID and with references. */ 4247 TAILQ_FOREACH(pr, &allprison, pr_list) 4248 if (pr->pr_id == addr && pr->pr_ref > 0) 4249 break; 4250 if (pr == NULL) 4251 /* Look again, without requiring a reference. */ 4252 TAILQ_FOREACH(pr, &allprison, pr_list) 4253 if (pr->pr_id == addr) 4254 break; 4255 if (pr == NULL) 4256 /* Assume address points to a valid prison. */ 4257 pr = (struct prison *)addr; 4258 } 4259 db_show_prison(pr); 4260 } 4261 4262 #endif /* DDB */ 4263