1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1999 Poul-Henning Kamp. 5 * Copyright (c) 2008 Bjoern A. Zeeb. 6 * Copyright (c) 2009 James Gritton. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include "opt_ddb.h" 35 #include "opt_inet.h" 36 #include "opt_inet6.h" 37 38 #include <sys/param.h> 39 #include <sys/types.h> 40 #include <sys/kernel.h> 41 #include <sys/systm.h> 42 #include <sys/errno.h> 43 #include <sys/sysproto.h> 44 #include <sys/malloc.h> 45 #include <sys/osd.h> 46 #include <sys/priv.h> 47 #include <sys/proc.h> 48 #include <sys/taskqueue.h> 49 #include <sys/fcntl.h> 50 #include <sys/jail.h> 51 #include <sys/lock.h> 52 #include <sys/mutex.h> 53 #include <sys/racct.h> 54 #include <sys/rctl.h> 55 #include <sys/refcount.h> 56 #include <sys/sx.h> 57 #include <sys/sysent.h> 58 #include <sys/namei.h> 59 #include <sys/mount.h> 60 #include <sys/queue.h> 61 #include <sys/socket.h> 62 #include <sys/syscallsubr.h> 63 #include <sys/sysctl.h> 64 #include <sys/vnode.h> 65 66 #include <net/if.h> 67 #include <net/vnet.h> 68 69 #include <netinet/in.h> 70 71 #ifdef DDB 72 #include <ddb/ddb.h> 73 #endif /* DDB */ 74 75 #include <security/mac/mac_framework.h> 76 77 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 78 79 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 80 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 81 82 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 83 #ifdef INET 84 #ifdef INET6 85 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 86 #else 87 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 88 #endif 89 #else /* !INET */ 90 #ifdef INET6 91 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 92 #else 93 #define _PR_IP_SADDRSEL 0 94 #endif 95 #endif 96 97 /* prison0 describes what is "real" about the system. */ 98 struct prison prison0 = { 99 .pr_id = 0, 100 .pr_name = "0", 101 .pr_ref = 1, 102 .pr_uref = 1, 103 .pr_path = "/", 104 .pr_securelevel = -1, 105 .pr_devfs_rsnum = 0, 106 .pr_childmax = JAIL_MAX, 107 .pr_hostuuid = DEFAULT_HOSTUUID, 108 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 109 #ifdef VIMAGE 110 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 111 #else 112 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 113 #endif 114 .pr_allow = PR_ALLOW_ALL_STATIC, 115 }; 116 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 117 118 struct bool_flags { 119 const char *name; 120 const char *noname; 121 unsigned flag; 122 }; 123 struct jailsys_flags { 124 const char *name; 125 unsigned disable; 126 unsigned new; 127 }; 128 129 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 130 struct sx allprison_lock; 131 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 132 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 133 LIST_HEAD(, prison_racct) allprison_racct; 134 int lastprid = 0; 135 136 static int do_jail_attach(struct thread *td, struct prison *pr); 137 static void prison_complete(void *context, int pending); 138 static void prison_deref(struct prison *pr, int flags); 139 static char *prison_path(struct prison *pr1, struct prison *pr2); 140 static void prison_remove_one(struct prison *pr); 141 #ifdef RACCT 142 static void prison_racct_attach(struct prison *pr); 143 static void prison_racct_modify(struct prison *pr); 144 static void prison_racct_detach(struct prison *pr); 145 #endif 146 147 /* Flags for prison_deref */ 148 #define PD_DEREF 0x01 149 #define PD_DEUREF 0x02 150 #define PD_LOCKED 0x04 151 #define PD_LIST_SLOCKED 0x08 152 #define PD_LIST_XLOCKED 0x10 153 154 /* 155 * Parameter names corresponding to PR_* flag values. Size values are for kvm 156 * as we cannot figure out the size of a sparse array, or an array without a 157 * terminating entry. 158 */ 159 static struct bool_flags pr_flag_bool[] = { 160 {"persist", "nopersist", PR_PERSIST}, 161 #ifdef INET 162 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL}, 163 #endif 164 #ifdef INET6 165 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL}, 166 #endif 167 }; 168 const size_t pr_flag_bool_size = sizeof(pr_flag_bool); 169 170 static struct jailsys_flags pr_flag_jailsys[] = { 171 {"host", 0, PR_HOST}, 172 #ifdef VIMAGE 173 {"vnet", 0, PR_VNET}, 174 #endif 175 #ifdef INET 176 {"ip4", PR_IP4_USER, PR_IP4_USER}, 177 #endif 178 #ifdef INET6 179 {"ip6", PR_IP6_USER, PR_IP6_USER}, 180 #endif 181 }; 182 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 183 184 /* Make this array full-size so dynamic parameters can be added. */ 185 static struct bool_flags pr_flag_allow[NBBY * NBPW] = { 186 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME}, 187 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC}, 188 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS}, 189 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS}, 190 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT}, 191 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS}, 192 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF}, 193 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK}, 194 {"allow.reserved_ports", "allow.noreserved_ports", 195 PR_ALLOW_RESERVED_PORTS}, 196 }; 197 const size_t pr_flag_allow_size = sizeof(pr_flag_allow); 198 199 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | PR_ALLOW_RESERVED_PORTS) 200 #define JAIL_DEFAULT_ENFORCE_STATFS 2 201 #define JAIL_DEFAULT_DEVFS_RSNUM 0 202 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 203 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 204 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 205 #if defined(INET) || defined(INET6) 206 static unsigned jail_max_af_ips = 255; 207 #endif 208 209 /* 210 * Initialize the parts of prison0 that can't be static-initialized with 211 * constants. This is called from proc0_init() after creating thread0 cpuset. 212 */ 213 void 214 prison0_init(void) 215 { 216 217 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 218 prison0.pr_osreldate = osreldate; 219 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 220 } 221 222 /* 223 * struct jail_args { 224 * struct jail *jail; 225 * }; 226 */ 227 int 228 sys_jail(struct thread *td, struct jail_args *uap) 229 { 230 uint32_t version; 231 int error; 232 struct jail j; 233 234 error = copyin(uap->jail, &version, sizeof(uint32_t)); 235 if (error) 236 return (error); 237 238 switch (version) { 239 case 0: 240 { 241 struct jail_v0 j0; 242 243 /* FreeBSD single IPv4 jails. */ 244 bzero(&j, sizeof(struct jail)); 245 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 246 if (error) 247 return (error); 248 j.version = j0.version; 249 j.path = j0.path; 250 j.hostname = j0.hostname; 251 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 252 break; 253 } 254 255 case 1: 256 /* 257 * Version 1 was used by multi-IPv4 jail implementations 258 * that never made it into the official kernel. 259 */ 260 return (EINVAL); 261 262 case 2: /* JAIL_API_VERSION */ 263 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 264 error = copyin(uap->jail, &j, sizeof(struct jail)); 265 if (error) 266 return (error); 267 break; 268 269 default: 270 /* Sci-Fi jails are not supported, sorry. */ 271 return (EINVAL); 272 } 273 return (kern_jail(td, &j)); 274 } 275 276 int 277 kern_jail(struct thread *td, struct jail *j) 278 { 279 struct iovec optiov[2 * (4 + nitems(pr_flag_allow) 280 #ifdef INET 281 + 1 282 #endif 283 #ifdef INET6 284 + 1 285 #endif 286 )]; 287 struct uio opt; 288 char *u_path, *u_hostname, *u_name; 289 struct bool_flags *bf; 290 #ifdef INET 291 uint32_t ip4s; 292 struct in_addr *u_ip4; 293 #endif 294 #ifdef INET6 295 struct in6_addr *u_ip6; 296 #endif 297 size_t tmplen; 298 int error, enforce_statfs; 299 300 bzero(&optiov, sizeof(optiov)); 301 opt.uio_iov = optiov; 302 opt.uio_iovcnt = 0; 303 opt.uio_offset = -1; 304 opt.uio_resid = -1; 305 opt.uio_segflg = UIO_SYSSPACE; 306 opt.uio_rw = UIO_READ; 307 opt.uio_td = td; 308 309 /* Set permissions for top-level jails from sysctls. */ 310 if (!jailed(td->td_ucred)) { 311 for (bf = pr_flag_allow; 312 bf < pr_flag_allow + nitems(pr_flag_allow) && 313 bf->flag != 0; 314 bf++) { 315 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *, 316 (jail_default_allow & bf->flag) 317 ? bf->name : bf->noname); 318 optiov[opt.uio_iovcnt].iov_len = 319 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 320 opt.uio_iovcnt += 2; 321 } 322 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 323 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 324 opt.uio_iovcnt++; 325 enforce_statfs = jail_default_enforce_statfs; 326 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 327 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 328 opt.uio_iovcnt++; 329 } 330 331 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 332 #ifdef INET 333 ip4s = (j->version == 0) ? 1 : j->ip4s; 334 if (ip4s > jail_max_af_ips) 335 return (EINVAL); 336 tmplen += ip4s * sizeof(struct in_addr); 337 #else 338 if (j->ip4s > 0) 339 return (EINVAL); 340 #endif 341 #ifdef INET6 342 if (j->ip6s > jail_max_af_ips) 343 return (EINVAL); 344 tmplen += j->ip6s * sizeof(struct in6_addr); 345 #else 346 if (j->ip6s > 0) 347 return (EINVAL); 348 #endif 349 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 350 u_hostname = u_path + MAXPATHLEN; 351 u_name = u_hostname + MAXHOSTNAMELEN; 352 #ifdef INET 353 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 354 #endif 355 #ifdef INET6 356 #ifdef INET 357 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 358 #else 359 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 360 #endif 361 #endif 362 optiov[opt.uio_iovcnt].iov_base = "path"; 363 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 364 opt.uio_iovcnt++; 365 optiov[opt.uio_iovcnt].iov_base = u_path; 366 error = copyinstr(j->path, u_path, MAXPATHLEN, 367 &optiov[opt.uio_iovcnt].iov_len); 368 if (error) { 369 free(u_path, M_TEMP); 370 return (error); 371 } 372 opt.uio_iovcnt++; 373 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 374 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 375 opt.uio_iovcnt++; 376 optiov[opt.uio_iovcnt].iov_base = u_hostname; 377 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 378 &optiov[opt.uio_iovcnt].iov_len); 379 if (error) { 380 free(u_path, M_TEMP); 381 return (error); 382 } 383 opt.uio_iovcnt++; 384 if (j->jailname != NULL) { 385 optiov[opt.uio_iovcnt].iov_base = "name"; 386 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 387 opt.uio_iovcnt++; 388 optiov[opt.uio_iovcnt].iov_base = u_name; 389 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 390 &optiov[opt.uio_iovcnt].iov_len); 391 if (error) { 392 free(u_path, M_TEMP); 393 return (error); 394 } 395 opt.uio_iovcnt++; 396 } 397 #ifdef INET 398 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 399 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 400 opt.uio_iovcnt++; 401 optiov[opt.uio_iovcnt].iov_base = u_ip4; 402 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 403 if (j->version == 0) 404 u_ip4->s_addr = j->ip4s; 405 else { 406 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 407 if (error) { 408 free(u_path, M_TEMP); 409 return (error); 410 } 411 } 412 opt.uio_iovcnt++; 413 #endif 414 #ifdef INET6 415 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 416 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 417 opt.uio_iovcnt++; 418 optiov[opt.uio_iovcnt].iov_base = u_ip6; 419 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 420 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 421 if (error) { 422 free(u_path, M_TEMP); 423 return (error); 424 } 425 opt.uio_iovcnt++; 426 #endif 427 KASSERT(opt.uio_iovcnt <= nitems(optiov), 428 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 429 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 430 free(u_path, M_TEMP); 431 return (error); 432 } 433 434 435 /* 436 * struct jail_set_args { 437 * struct iovec *iovp; 438 * unsigned int iovcnt; 439 * int flags; 440 * }; 441 */ 442 int 443 sys_jail_set(struct thread *td, struct jail_set_args *uap) 444 { 445 struct uio *auio; 446 int error; 447 448 /* Check that we have an even number of iovecs. */ 449 if (uap->iovcnt & 1) 450 return (EINVAL); 451 452 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 453 if (error) 454 return (error); 455 error = kern_jail_set(td, auio, uap->flags); 456 free(auio, M_IOV); 457 return (error); 458 } 459 460 int 461 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 462 { 463 struct nameidata nd; 464 #ifdef INET 465 struct in_addr *ip4; 466 #endif 467 #ifdef INET6 468 struct in6_addr *ip6; 469 #endif 470 struct vfsopt *opt; 471 struct vfsoptlist *opts; 472 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 473 struct vnode *root; 474 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 475 char *g_path, *osrelstr; 476 struct bool_flags *bf; 477 struct jailsys_flags *jsf; 478 #if defined(INET) || defined(INET6) 479 struct prison *tppr; 480 void *op; 481 #endif 482 unsigned long hid; 483 size_t namelen, onamelen, pnamelen; 484 int born, created, cuflags, descend, enforce; 485 int error, errmsg_len, errmsg_pos; 486 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 487 int jid, jsys, len, level; 488 int childmax, osreldt, rsnum, slevel; 489 int fullpath_disabled; 490 #if defined(INET) || defined(INET6) 491 int ii, ij; 492 #endif 493 #ifdef INET 494 int ip4s, redo_ip4; 495 #endif 496 #ifdef INET6 497 int ip6s, redo_ip6; 498 #endif 499 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 500 unsigned tallow; 501 char numbuf[12]; 502 503 error = priv_check(td, PRIV_JAIL_SET); 504 if (!error && (flags & JAIL_ATTACH)) 505 error = priv_check(td, PRIV_JAIL_ATTACH); 506 if (error) 507 return (error); 508 mypr = td->td_ucred->cr_prison; 509 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 510 return (EPERM); 511 if (flags & ~JAIL_SET_MASK) 512 return (EINVAL); 513 514 /* 515 * Check all the parameters before committing to anything. Not all 516 * errors can be caught early, but we may as well try. Also, this 517 * takes care of some expensive stuff (path lookup) before getting 518 * the allprison lock. 519 * 520 * XXX Jails are not filesystems, and jail parameters are not mount 521 * options. But it makes more sense to re-use the vfsopt code 522 * than duplicate it under a different name. 523 */ 524 error = vfs_buildopts(optuio, &opts); 525 if (error) 526 return (error); 527 #ifdef INET 528 ip4 = NULL; 529 #endif 530 #ifdef INET6 531 ip6 = NULL; 532 #endif 533 g_path = NULL; 534 535 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 536 if (!cuflags) { 537 error = EINVAL; 538 vfs_opterror(opts, "no valid operation (create or update)"); 539 goto done_errmsg; 540 } 541 542 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 543 if (error == ENOENT) 544 jid = 0; 545 else if (error != 0) 546 goto done_free; 547 548 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 549 if (error == ENOENT) 550 gotslevel = 0; 551 else if (error != 0) 552 goto done_free; 553 else 554 gotslevel = 1; 555 556 error = 557 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 558 if (error == ENOENT) 559 gotchildmax = 0; 560 else if (error != 0) 561 goto done_free; 562 else 563 gotchildmax = 1; 564 565 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 566 if (error == ENOENT) 567 gotenforce = 0; 568 else if (error != 0) 569 goto done_free; 570 else if (enforce < 0 || enforce > 2) { 571 error = EINVAL; 572 goto done_free; 573 } else 574 gotenforce = 1; 575 576 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 577 if (error == ENOENT) 578 gotrsnum = 0; 579 else if (error != 0) 580 goto done_free; 581 else 582 gotrsnum = 1; 583 584 pr_flags = ch_flags = 0; 585 for (bf = pr_flag_bool; 586 bf < pr_flag_bool + nitems(pr_flag_bool); 587 bf++) { 588 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag); 589 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag); 590 } 591 ch_flags |= pr_flags; 592 for (jsf = pr_flag_jailsys; 593 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 594 jsf++) { 595 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys)); 596 if (error == ENOENT) 597 continue; 598 if (error != 0) 599 goto done_free; 600 switch (jsys) { 601 case JAIL_SYS_DISABLE: 602 if (!jsf->disable) { 603 error = EINVAL; 604 goto done_free; 605 } 606 pr_flags |= jsf->disable; 607 break; 608 case JAIL_SYS_NEW: 609 pr_flags |= jsf->new; 610 break; 611 case JAIL_SYS_INHERIT: 612 break; 613 default: 614 error = EINVAL; 615 goto done_free; 616 } 617 ch_flags |= jsf->new | jsf->disable; 618 } 619 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 620 && !(pr_flags & PR_PERSIST)) { 621 error = EINVAL; 622 vfs_opterror(opts, "new jail must persist or attach"); 623 goto done_errmsg; 624 } 625 #ifdef VIMAGE 626 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 627 error = EINVAL; 628 vfs_opterror(opts, "vnet cannot be changed after creation"); 629 goto done_errmsg; 630 } 631 #endif 632 #ifdef INET 633 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 634 error = EINVAL; 635 vfs_opterror(opts, "ip4 cannot be changed after creation"); 636 goto done_errmsg; 637 } 638 #endif 639 #ifdef INET6 640 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 641 error = EINVAL; 642 vfs_opterror(opts, "ip6 cannot be changed after creation"); 643 goto done_errmsg; 644 } 645 #endif 646 647 pr_allow = ch_allow = 0; 648 for (bf = pr_flag_allow; 649 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 650 bf++) { 651 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag); 652 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag); 653 } 654 ch_allow |= pr_allow; 655 656 error = vfs_getopt(opts, "name", (void **)&name, &len); 657 if (error == ENOENT) 658 name = NULL; 659 else if (error != 0) 660 goto done_free; 661 else { 662 if (len == 0 || name[len - 1] != '\0') { 663 error = EINVAL; 664 goto done_free; 665 } 666 if (len > MAXHOSTNAMELEN) { 667 error = ENAMETOOLONG; 668 goto done_free; 669 } 670 } 671 672 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 673 if (error == ENOENT) 674 host = NULL; 675 else if (error != 0) 676 goto done_free; 677 else { 678 ch_flags |= PR_HOST; 679 pr_flags |= PR_HOST; 680 if (len == 0 || host[len - 1] != '\0') { 681 error = EINVAL; 682 goto done_free; 683 } 684 if (len > MAXHOSTNAMELEN) { 685 error = ENAMETOOLONG; 686 goto done_free; 687 } 688 } 689 690 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 691 if (error == ENOENT) 692 domain = NULL; 693 else if (error != 0) 694 goto done_free; 695 else { 696 ch_flags |= PR_HOST; 697 pr_flags |= PR_HOST; 698 if (len == 0 || domain[len - 1] != '\0') { 699 error = EINVAL; 700 goto done_free; 701 } 702 if (len > MAXHOSTNAMELEN) { 703 error = ENAMETOOLONG; 704 goto done_free; 705 } 706 } 707 708 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 709 if (error == ENOENT) 710 uuid = NULL; 711 else if (error != 0) 712 goto done_free; 713 else { 714 ch_flags |= PR_HOST; 715 pr_flags |= PR_HOST; 716 if (len == 0 || uuid[len - 1] != '\0') { 717 error = EINVAL; 718 goto done_free; 719 } 720 if (len > HOSTUUIDLEN) { 721 error = ENAMETOOLONG; 722 goto done_free; 723 } 724 } 725 726 #ifdef COMPAT_FREEBSD32 727 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 728 uint32_t hid32; 729 730 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 731 hid = hid32; 732 } else 733 #endif 734 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 735 if (error == ENOENT) 736 gothid = 0; 737 else if (error != 0) 738 goto done_free; 739 else { 740 gothid = 1; 741 ch_flags |= PR_HOST; 742 pr_flags |= PR_HOST; 743 } 744 745 #ifdef INET 746 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 747 if (error == ENOENT) 748 ip4s = 0; 749 else if (error != 0) 750 goto done_free; 751 else if (ip4s & (sizeof(*ip4) - 1)) { 752 error = EINVAL; 753 goto done_free; 754 } else { 755 ch_flags |= PR_IP4_USER; 756 pr_flags |= PR_IP4_USER; 757 if (ip4s > 0) { 758 ip4s /= sizeof(*ip4); 759 if (ip4s > jail_max_af_ips) { 760 error = EINVAL; 761 vfs_opterror(opts, "too many IPv4 addresses"); 762 goto done_errmsg; 763 } 764 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 765 bcopy(op, ip4, ip4s * sizeof(*ip4)); 766 /* 767 * IP addresses are all sorted but ip[0] to preserve 768 * the primary IP address as given from userland. 769 * This special IP is used for unbound outgoing 770 * connections as well for "loopback" traffic in case 771 * source address selection cannot find any more fitting 772 * address to connect from. 773 */ 774 if (ip4s > 1) 775 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), 776 prison_qcmp_v4); 777 /* 778 * Check for duplicate addresses and do some simple 779 * zero and broadcast checks. If users give other bogus 780 * addresses it is their problem. 781 * 782 * We do not have to care about byte order for these 783 * checks so we will do them in NBO. 784 */ 785 for (ii = 0; ii < ip4s; ii++) { 786 if (ip4[ii].s_addr == INADDR_ANY || 787 ip4[ii].s_addr == INADDR_BROADCAST) { 788 error = EINVAL; 789 goto done_free; 790 } 791 if ((ii+1) < ip4s && 792 (ip4[0].s_addr == ip4[ii+1].s_addr || 793 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 794 error = EINVAL; 795 goto done_free; 796 } 797 } 798 } 799 } 800 #endif 801 802 #ifdef INET6 803 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 804 if (error == ENOENT) 805 ip6s = 0; 806 else if (error != 0) 807 goto done_free; 808 else if (ip6s & (sizeof(*ip6) - 1)) { 809 error = EINVAL; 810 goto done_free; 811 } else { 812 ch_flags |= PR_IP6_USER; 813 pr_flags |= PR_IP6_USER; 814 if (ip6s > 0) { 815 ip6s /= sizeof(*ip6); 816 if (ip6s > jail_max_af_ips) { 817 error = EINVAL; 818 vfs_opterror(opts, "too many IPv6 addresses"); 819 goto done_errmsg; 820 } 821 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 822 bcopy(op, ip6, ip6s * sizeof(*ip6)); 823 if (ip6s > 1) 824 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), 825 prison_qcmp_v6); 826 for (ii = 0; ii < ip6s; ii++) { 827 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 828 error = EINVAL; 829 goto done_free; 830 } 831 if ((ii+1) < ip6s && 832 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 833 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 834 { 835 error = EINVAL; 836 goto done_free; 837 } 838 } 839 } 840 } 841 #endif 842 843 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 844 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 845 error = EINVAL; 846 vfs_opterror(opts, 847 "vnet jails cannot have IP address restrictions"); 848 goto done_errmsg; 849 } 850 #endif 851 852 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 853 if (error == ENOENT) 854 osrelstr = NULL; 855 else if (error != 0) 856 goto done_free; 857 else { 858 if (flags & JAIL_UPDATE) { 859 error = EINVAL; 860 vfs_opterror(opts, 861 "osrelease cannot be changed after creation"); 862 goto done_errmsg; 863 } 864 if (len == 0 || len >= OSRELEASELEN) { 865 error = EINVAL; 866 vfs_opterror(opts, 867 "osrelease string must be 1-%d bytes long", 868 OSRELEASELEN - 1); 869 goto done_errmsg; 870 } 871 } 872 873 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 874 if (error == ENOENT) 875 osreldt = 0; 876 else if (error != 0) 877 goto done_free; 878 else { 879 if (flags & JAIL_UPDATE) { 880 error = EINVAL; 881 vfs_opterror(opts, 882 "osreldate cannot be changed after creation"); 883 goto done_errmsg; 884 } 885 if (osreldt == 0) { 886 error = EINVAL; 887 vfs_opterror(opts, "osreldate cannot be 0"); 888 goto done_errmsg; 889 } 890 } 891 892 fullpath_disabled = 0; 893 root = NULL; 894 error = vfs_getopt(opts, "path", (void **)&path, &len); 895 if (error == ENOENT) 896 path = NULL; 897 else if (error != 0) 898 goto done_free; 899 else { 900 if (flags & JAIL_UPDATE) { 901 error = EINVAL; 902 vfs_opterror(opts, 903 "path cannot be changed after creation"); 904 goto done_errmsg; 905 } 906 if (len == 0 || path[len - 1] != '\0') { 907 error = EINVAL; 908 goto done_free; 909 } 910 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 911 path, td); 912 error = namei(&nd); 913 if (error) 914 goto done_free; 915 root = nd.ni_vp; 916 NDFREE(&nd, NDF_ONLY_PNBUF); 917 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 918 strlcpy(g_path, path, MAXPATHLEN); 919 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 920 if (error == 0) 921 path = g_path; 922 else if (error == ENODEV) { 923 /* proceed if sysctl debug.disablefullpath == 1 */ 924 fullpath_disabled = 1; 925 if (len < 2 || (len == 2 && path[0] == '/')) 926 path = NULL; 927 } else { 928 /* exit on other errors */ 929 goto done_free; 930 } 931 if (root->v_type != VDIR) { 932 error = ENOTDIR; 933 vput(root); 934 goto done_free; 935 } 936 VOP_UNLOCK(root, 0); 937 if (fullpath_disabled) { 938 /* Leave room for a real-root full pathname. */ 939 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 940 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 941 error = ENAMETOOLONG; 942 vrele(root); 943 goto done_free; 944 } 945 } 946 } 947 948 /* 949 * Find the specified jail, or at least its parent. 950 * This abuses the file error codes ENOENT and EEXIST. 951 */ 952 pr = NULL; 953 ppr = mypr; 954 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 955 namelc = strrchr(name, '.'); 956 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 957 if (*p != '\0') 958 jid = 0; 959 } 960 sx_xlock(&allprison_lock); 961 if (jid != 0) { 962 /* 963 * See if a requested jid already exists. There is an 964 * information leak here if the jid exists but is not within 965 * the caller's jail hierarchy. Jail creators will get EEXIST 966 * even though they cannot see the jail, and CREATE | UPDATE 967 * will return ENOENT which is not normally a valid error. 968 */ 969 if (jid < 0) { 970 error = EINVAL; 971 vfs_opterror(opts, "negative jid"); 972 goto done_unlock_list; 973 } 974 pr = prison_find(jid); 975 if (pr != NULL) { 976 ppr = pr->pr_parent; 977 /* Create: jid must not exist. */ 978 if (cuflags == JAIL_CREATE) { 979 mtx_unlock(&pr->pr_mtx); 980 error = EEXIST; 981 vfs_opterror(opts, "jail %d already exists", 982 jid); 983 goto done_unlock_list; 984 } 985 if (!prison_ischild(mypr, pr)) { 986 mtx_unlock(&pr->pr_mtx); 987 pr = NULL; 988 } else if (pr->pr_uref == 0) { 989 if (!(flags & JAIL_DYING)) { 990 mtx_unlock(&pr->pr_mtx); 991 error = ENOENT; 992 vfs_opterror(opts, "jail %d is dying", 993 jid); 994 goto done_unlock_list; 995 } else if ((flags & JAIL_ATTACH) || 996 (pr_flags & PR_PERSIST)) { 997 /* 998 * A dying jail might be resurrected 999 * (via attach or persist), but first 1000 * it must determine if another jail 1001 * has claimed its name. Accomplish 1002 * this by implicitly re-setting the 1003 * name. 1004 */ 1005 if (name == NULL) 1006 name = prison_name(mypr, pr); 1007 } 1008 } 1009 } 1010 if (pr == NULL) { 1011 /* Update: jid must exist. */ 1012 if (cuflags == JAIL_UPDATE) { 1013 error = ENOENT; 1014 vfs_opterror(opts, "jail %d not found", jid); 1015 goto done_unlock_list; 1016 } 1017 } 1018 } 1019 /* 1020 * If the caller provided a name, look for a jail by that name. 1021 * This has different semantics for creates and updates keyed by jid 1022 * (where the name must not already exist in a different jail), 1023 * and updates keyed by the name itself (where the name must exist 1024 * because that is the jail being updated). 1025 */ 1026 namelc = NULL; 1027 if (name != NULL) { 1028 namelc = strrchr(name, '.'); 1029 if (namelc == NULL) 1030 namelc = name; 1031 else { 1032 /* 1033 * This is a hierarchical name. Split it into the 1034 * parent and child names, and make sure the parent 1035 * exists or matches an already found jail. 1036 */ 1037 if (pr != NULL) { 1038 if (strncmp(name, ppr->pr_name, namelc - name) 1039 || ppr->pr_name[namelc - name] != '\0') { 1040 mtx_unlock(&pr->pr_mtx); 1041 error = EINVAL; 1042 vfs_opterror(opts, 1043 "cannot change jail's parent"); 1044 goto done_unlock_list; 1045 } 1046 } else { 1047 *namelc = '\0'; 1048 ppr = prison_find_name(mypr, name); 1049 if (ppr == NULL) { 1050 error = ENOENT; 1051 vfs_opterror(opts, 1052 "jail \"%s\" not found", name); 1053 goto done_unlock_list; 1054 } 1055 mtx_unlock(&ppr->pr_mtx); 1056 *namelc = '.'; 1057 } 1058 namelc++; 1059 } 1060 if (namelc[0] != '\0') { 1061 pnamelen = 1062 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1063 name_again: 1064 deadpr = NULL; 1065 FOREACH_PRISON_CHILD(ppr, tpr) { 1066 if (tpr != pr && tpr->pr_ref > 0 && 1067 !strcmp(tpr->pr_name + pnamelen, namelc)) { 1068 if (pr == NULL && 1069 cuflags != JAIL_CREATE) { 1070 mtx_lock(&tpr->pr_mtx); 1071 if (tpr->pr_ref > 0) { 1072 /* 1073 * Use this jail 1074 * for updates. 1075 */ 1076 if (tpr->pr_uref > 0) { 1077 pr = tpr; 1078 break; 1079 } 1080 deadpr = tpr; 1081 } 1082 mtx_unlock(&tpr->pr_mtx); 1083 } else if (tpr->pr_uref > 0) { 1084 /* 1085 * Create, or update(jid): 1086 * name must not exist in an 1087 * active sibling jail. 1088 */ 1089 error = EEXIST; 1090 if (pr != NULL) 1091 mtx_unlock(&pr->pr_mtx); 1092 vfs_opterror(opts, 1093 "jail \"%s\" already exists", 1094 name); 1095 goto done_unlock_list; 1096 } 1097 } 1098 } 1099 /* If no active jail is found, use a dying one. */ 1100 if (deadpr != NULL && pr == NULL) { 1101 if (flags & JAIL_DYING) { 1102 mtx_lock(&deadpr->pr_mtx); 1103 if (deadpr->pr_ref == 0) { 1104 mtx_unlock(&deadpr->pr_mtx); 1105 goto name_again; 1106 } 1107 pr = deadpr; 1108 } else if (cuflags == JAIL_UPDATE) { 1109 error = ENOENT; 1110 vfs_opterror(opts, 1111 "jail \"%s\" is dying", name); 1112 goto done_unlock_list; 1113 } 1114 } 1115 /* Update: name must exist if no jid. */ 1116 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1117 error = ENOENT; 1118 vfs_opterror(opts, "jail \"%s\" not found", 1119 name); 1120 goto done_unlock_list; 1121 } 1122 } 1123 } 1124 /* Update: must provide a jid or name. */ 1125 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1126 error = ENOENT; 1127 vfs_opterror(opts, "update specified no jail"); 1128 goto done_unlock_list; 1129 } 1130 1131 /* If there's no prison to update, create a new one and link it in. */ 1132 if (pr == NULL) { 1133 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1134 if (tpr->pr_childcount >= tpr->pr_childmax) { 1135 error = EPERM; 1136 vfs_opterror(opts, "prison limit exceeded"); 1137 goto done_unlock_list; 1138 } 1139 created = 1; 1140 mtx_lock(&ppr->pr_mtx); 1141 if (ppr->pr_ref == 0) { 1142 mtx_unlock(&ppr->pr_mtx); 1143 error = ENOENT; 1144 vfs_opterror(opts, "jail \"%s\" not found", 1145 prison_name(mypr, ppr)); 1146 goto done_unlock_list; 1147 } 1148 ppr->pr_ref++; 1149 ppr->pr_uref++; 1150 mtx_unlock(&ppr->pr_mtx); 1151 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1152 if (jid == 0) { 1153 /* Find the next free jid. */ 1154 jid = lastprid + 1; 1155 findnext: 1156 if (jid == JAIL_MAX) 1157 jid = 1; 1158 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1159 if (tpr->pr_id < jid) 1160 continue; 1161 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1162 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1163 break; 1164 } 1165 if (jid == lastprid) { 1166 error = EAGAIN; 1167 vfs_opterror(opts, 1168 "no available jail IDs"); 1169 free(pr, M_PRISON); 1170 prison_deref(ppr, PD_DEREF | 1171 PD_DEUREF | PD_LIST_XLOCKED); 1172 goto done_releroot; 1173 } 1174 jid++; 1175 goto findnext; 1176 } 1177 lastprid = jid; 1178 } else { 1179 /* 1180 * The jail already has a jid (that did not yet exist), 1181 * so just find where to insert it. 1182 */ 1183 TAILQ_FOREACH(tpr, &allprison, pr_list) 1184 if (tpr->pr_id >= jid) { 1185 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1186 break; 1187 } 1188 } 1189 if (tpr == NULL) 1190 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1191 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1192 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1193 tpr->pr_childcount++; 1194 1195 pr->pr_parent = ppr; 1196 pr->pr_id = jid; 1197 1198 /* Set some default values, and inherit some from the parent. */ 1199 if (namelc == NULL) 1200 namelc = ""; 1201 if (path == NULL) { 1202 path = "/"; 1203 root = mypr->pr_root; 1204 vref(root); 1205 } 1206 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1207 pr->pr_flags |= PR_HOST; 1208 #if defined(INET) || defined(INET6) 1209 #ifdef VIMAGE 1210 if (!(pr_flags & PR_VNET)) 1211 #endif 1212 { 1213 #ifdef INET 1214 if (!(ch_flags & PR_IP4_USER)) 1215 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1216 else if (!(pr_flags & PR_IP4_USER)) { 1217 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1218 if (ppr->pr_ip4 != NULL) { 1219 pr->pr_ip4s = ppr->pr_ip4s; 1220 pr->pr_ip4 = malloc(pr->pr_ip4s * 1221 sizeof(struct in_addr), M_PRISON, 1222 M_WAITOK); 1223 bcopy(ppr->pr_ip4, pr->pr_ip4, 1224 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1225 } 1226 } 1227 #endif 1228 #ifdef INET6 1229 if (!(ch_flags & PR_IP6_USER)) 1230 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1231 else if (!(pr_flags & PR_IP6_USER)) { 1232 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1233 if (ppr->pr_ip6 != NULL) { 1234 pr->pr_ip6s = ppr->pr_ip6s; 1235 pr->pr_ip6 = malloc(pr->pr_ip6s * 1236 sizeof(struct in6_addr), M_PRISON, 1237 M_WAITOK); 1238 bcopy(ppr->pr_ip6, pr->pr_ip6, 1239 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1240 } 1241 } 1242 #endif 1243 } 1244 #endif 1245 /* Source address selection is always on by default. */ 1246 pr->pr_flags |= _PR_IP_SADDRSEL; 1247 1248 pr->pr_securelevel = ppr->pr_securelevel; 1249 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1250 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1251 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1252 1253 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1254 if (osrelstr == NULL) 1255 strcpy(pr->pr_osrelease, ppr->pr_osrelease); 1256 else 1257 strcpy(pr->pr_osrelease, osrelstr); 1258 1259 LIST_INIT(&pr->pr_children); 1260 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1261 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1262 1263 #ifdef VIMAGE 1264 /* Allocate a new vnet if specified. */ 1265 pr->pr_vnet = (pr_flags & PR_VNET) 1266 ? vnet_alloc() : ppr->pr_vnet; 1267 #endif 1268 /* 1269 * Allocate a dedicated cpuset for each jail. 1270 * Unlike other initial settings, this may return an erorr. 1271 */ 1272 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1273 if (error) { 1274 prison_deref(pr, PD_LIST_XLOCKED); 1275 goto done_releroot; 1276 } 1277 1278 mtx_lock(&pr->pr_mtx); 1279 /* 1280 * New prisons do not yet have a reference, because we do not 1281 * want others to see the incomplete prison once the 1282 * allprison_lock is downgraded. 1283 */ 1284 } else { 1285 created = 0; 1286 /* 1287 * Grab a reference for existing prisons, to ensure they 1288 * continue to exist for the duration of the call. 1289 */ 1290 pr->pr_ref++; 1291 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1292 if ((pr->pr_flags & PR_VNET) && 1293 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1294 error = EINVAL; 1295 vfs_opterror(opts, 1296 "vnet jails cannot have IP address restrictions"); 1297 goto done_deref_locked; 1298 } 1299 #endif 1300 #ifdef INET 1301 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1302 error = EINVAL; 1303 vfs_opterror(opts, 1304 "ip4 cannot be changed after creation"); 1305 goto done_deref_locked; 1306 } 1307 #endif 1308 #ifdef INET6 1309 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1310 error = EINVAL; 1311 vfs_opterror(opts, 1312 "ip6 cannot be changed after creation"); 1313 goto done_deref_locked; 1314 } 1315 #endif 1316 } 1317 1318 /* Do final error checking before setting anything. */ 1319 if (gotslevel) { 1320 if (slevel < ppr->pr_securelevel) { 1321 error = EPERM; 1322 goto done_deref_locked; 1323 } 1324 } 1325 if (gotchildmax) { 1326 if (childmax >= ppr->pr_childmax) { 1327 error = EPERM; 1328 goto done_deref_locked; 1329 } 1330 } 1331 if (gotenforce) { 1332 if (enforce < ppr->pr_enforce_statfs) { 1333 error = EPERM; 1334 goto done_deref_locked; 1335 } 1336 } 1337 if (gotrsnum) { 1338 /* 1339 * devfs_rsnum is a uint16_t 1340 */ 1341 if (rsnum < 0 || rsnum > 65535) { 1342 error = EINVAL; 1343 goto done_deref_locked; 1344 } 1345 /* 1346 * Nested jails always inherit parent's devfs ruleset 1347 */ 1348 if (jailed(td->td_ucred)) { 1349 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1350 error = EPERM; 1351 goto done_deref_locked; 1352 } else 1353 rsnum = ppr->pr_devfs_rsnum; 1354 } 1355 } 1356 #ifdef INET 1357 if (ip4s > 0) { 1358 if (ppr->pr_flags & PR_IP4) { 1359 /* 1360 * Make sure the new set of IP addresses is a 1361 * subset of the parent's list. Don't worry 1362 * about the parent being unlocked, as any 1363 * setting is done with allprison_lock held. 1364 */ 1365 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1366 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1367 break; 1368 if (ij == ppr->pr_ip4s) { 1369 error = EPERM; 1370 goto done_deref_locked; 1371 } 1372 if (ip4s > 1) { 1373 for (ii = ij = 1; ii < ip4s; ii++) { 1374 if (ip4[ii].s_addr == 1375 ppr->pr_ip4[0].s_addr) 1376 continue; 1377 for (; ij < ppr->pr_ip4s; ij++) 1378 if (ip4[ii].s_addr == 1379 ppr->pr_ip4[ij].s_addr) 1380 break; 1381 if (ij == ppr->pr_ip4s) 1382 break; 1383 } 1384 if (ij == ppr->pr_ip4s) { 1385 error = EPERM; 1386 goto done_deref_locked; 1387 } 1388 } 1389 } 1390 /* 1391 * Check for conflicting IP addresses. We permit them 1392 * if there is no more than one IP on each jail. If 1393 * there is a duplicate on a jail with more than one 1394 * IP stop checking and return error. 1395 */ 1396 #ifdef VIMAGE 1397 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1398 if (tppr->pr_flags & PR_VNET) 1399 break; 1400 #else 1401 tppr = &prison0; 1402 #endif 1403 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1404 if (tpr == pr || 1405 #ifdef VIMAGE 1406 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1407 #endif 1408 tpr->pr_uref == 0) { 1409 descend = 0; 1410 continue; 1411 } 1412 if (!(tpr->pr_flags & PR_IP4_USER)) 1413 continue; 1414 descend = 0; 1415 if (tpr->pr_ip4 == NULL || 1416 (ip4s == 1 && tpr->pr_ip4s == 1)) 1417 continue; 1418 for (ii = 0; ii < ip4s; ii++) { 1419 if (prison_check_ip4_locked(tpr, &ip4[ii]) == 1420 0) { 1421 error = EADDRINUSE; 1422 vfs_opterror(opts, 1423 "IPv4 addresses clash"); 1424 goto done_deref_locked; 1425 } 1426 } 1427 } 1428 } 1429 #endif 1430 #ifdef INET6 1431 if (ip6s > 0) { 1432 if (ppr->pr_flags & PR_IP6) { 1433 /* 1434 * Make sure the new set of IP addresses is a 1435 * subset of the parent's list. 1436 */ 1437 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1438 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1439 &ppr->pr_ip6[ij])) 1440 break; 1441 if (ij == ppr->pr_ip6s) { 1442 error = EPERM; 1443 goto done_deref_locked; 1444 } 1445 if (ip6s > 1) { 1446 for (ii = ij = 1; ii < ip6s; ii++) { 1447 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1448 &ppr->pr_ip6[0])) 1449 continue; 1450 for (; ij < ppr->pr_ip6s; ij++) 1451 if (IN6_ARE_ADDR_EQUAL( 1452 &ip6[ii], &ppr->pr_ip6[ij])) 1453 break; 1454 if (ij == ppr->pr_ip6s) 1455 break; 1456 } 1457 if (ij == ppr->pr_ip6s) { 1458 error = EPERM; 1459 goto done_deref_locked; 1460 } 1461 } 1462 } 1463 /* Check for conflicting IP addresses. */ 1464 #ifdef VIMAGE 1465 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1466 if (tppr->pr_flags & PR_VNET) 1467 break; 1468 #else 1469 tppr = &prison0; 1470 #endif 1471 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1472 if (tpr == pr || 1473 #ifdef VIMAGE 1474 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1475 #endif 1476 tpr->pr_uref == 0) { 1477 descend = 0; 1478 continue; 1479 } 1480 if (!(tpr->pr_flags & PR_IP6_USER)) 1481 continue; 1482 descend = 0; 1483 if (tpr->pr_ip6 == NULL || 1484 (ip6s == 1 && tpr->pr_ip6s == 1)) 1485 continue; 1486 for (ii = 0; ii < ip6s; ii++) { 1487 if (prison_check_ip6_locked(tpr, &ip6[ii]) == 1488 0) { 1489 error = EADDRINUSE; 1490 vfs_opterror(opts, 1491 "IPv6 addresses clash"); 1492 goto done_deref_locked; 1493 } 1494 } 1495 } 1496 } 1497 #endif 1498 onamelen = namelen = 0; 1499 if (namelc != NULL) { 1500 /* Give a default name of the jid. Also allow the name to be 1501 * explicitly the jid - but not any other number, and only in 1502 * normal form (no leading zero/etc). 1503 */ 1504 if (namelc[0] == '\0') 1505 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1506 else if ((strtoul(namelc, &p, 10) != jid || 1507 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1508 error = EINVAL; 1509 vfs_opterror(opts, 1510 "name cannot be numeric (unless it is the jid)"); 1511 goto done_deref_locked; 1512 } 1513 /* 1514 * Make sure the name isn't too long for the prison or its 1515 * children. 1516 */ 1517 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1518 onamelen = strlen(pr->pr_name + pnamelen); 1519 namelen = strlen(namelc); 1520 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1521 error = ENAMETOOLONG; 1522 goto done_deref_locked; 1523 } 1524 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1525 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1526 sizeof(pr->pr_name)) { 1527 error = ENAMETOOLONG; 1528 goto done_deref_locked; 1529 } 1530 } 1531 } 1532 if (pr_allow & ~ppr->pr_allow) { 1533 error = EPERM; 1534 goto done_deref_locked; 1535 } 1536 1537 /* 1538 * Let modules check their parameters. This requires unlocking and 1539 * then re-locking the prison, but this is still a valid state as long 1540 * as allprison_lock remains xlocked. 1541 */ 1542 mtx_unlock(&pr->pr_mtx); 1543 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1544 if (error != 0) { 1545 prison_deref(pr, created 1546 ? PD_LIST_XLOCKED 1547 : PD_DEREF | PD_LIST_XLOCKED); 1548 goto done_releroot; 1549 } 1550 mtx_lock(&pr->pr_mtx); 1551 1552 /* At this point, all valid parameters should have been noted. */ 1553 TAILQ_FOREACH(opt, opts, link) { 1554 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1555 error = EINVAL; 1556 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1557 goto done_deref_locked; 1558 } 1559 } 1560 1561 /* Set the parameters of the prison. */ 1562 #ifdef INET 1563 redo_ip4 = 0; 1564 if (pr_flags & PR_IP4_USER) { 1565 pr->pr_flags |= PR_IP4; 1566 free(pr->pr_ip4, M_PRISON); 1567 pr->pr_ip4s = ip4s; 1568 pr->pr_ip4 = ip4; 1569 ip4 = NULL; 1570 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1571 #ifdef VIMAGE 1572 if (tpr->pr_flags & PR_VNET) { 1573 descend = 0; 1574 continue; 1575 } 1576 #endif 1577 if (prison_restrict_ip4(tpr, NULL)) { 1578 redo_ip4 = 1; 1579 descend = 0; 1580 } 1581 } 1582 } 1583 #endif 1584 #ifdef INET6 1585 redo_ip6 = 0; 1586 if (pr_flags & PR_IP6_USER) { 1587 pr->pr_flags |= PR_IP6; 1588 free(pr->pr_ip6, M_PRISON); 1589 pr->pr_ip6s = ip6s; 1590 pr->pr_ip6 = ip6; 1591 ip6 = NULL; 1592 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1593 #ifdef VIMAGE 1594 if (tpr->pr_flags & PR_VNET) { 1595 descend = 0; 1596 continue; 1597 } 1598 #endif 1599 if (prison_restrict_ip6(tpr, NULL)) { 1600 redo_ip6 = 1; 1601 descend = 0; 1602 } 1603 } 1604 } 1605 #endif 1606 if (gotslevel) { 1607 pr->pr_securelevel = slevel; 1608 /* Set all child jails to be at least this level. */ 1609 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1610 if (tpr->pr_securelevel < slevel) 1611 tpr->pr_securelevel = slevel; 1612 } 1613 if (gotchildmax) { 1614 pr->pr_childmax = childmax; 1615 /* Set all child jails to under this limit. */ 1616 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1617 if (tpr->pr_childmax > childmax - level) 1618 tpr->pr_childmax = childmax > level 1619 ? childmax - level : 0; 1620 } 1621 if (gotenforce) { 1622 pr->pr_enforce_statfs = enforce; 1623 /* Pass this restriction on to the children. */ 1624 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1625 if (tpr->pr_enforce_statfs < enforce) 1626 tpr->pr_enforce_statfs = enforce; 1627 } 1628 if (gotrsnum) { 1629 pr->pr_devfs_rsnum = rsnum; 1630 /* Pass this restriction on to the children. */ 1631 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1632 tpr->pr_devfs_rsnum = rsnum; 1633 } 1634 if (namelc != NULL) { 1635 if (ppr == &prison0) 1636 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1637 else 1638 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1639 ppr->pr_name, namelc); 1640 /* Change this component of child names. */ 1641 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1642 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1643 strlen(tpr->pr_name + onamelen) + 1); 1644 bcopy(pr->pr_name, tpr->pr_name, namelen); 1645 } 1646 } 1647 if (path != NULL) { 1648 /* Try to keep a real-rooted full pathname. */ 1649 if (fullpath_disabled && path[0] == '/' && 1650 strcmp(mypr->pr_path, "/")) 1651 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1652 mypr->pr_path, path); 1653 else 1654 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1655 pr->pr_root = root; 1656 } 1657 if (PR_HOST & ch_flags & ~pr_flags) { 1658 if (pr->pr_flags & PR_HOST) { 1659 /* 1660 * Copy the parent's host info. As with pr_ip4 above, 1661 * the lack of a lock on the parent is not a problem; 1662 * it is always set with allprison_lock at least 1663 * shared, and is held exclusively here. 1664 */ 1665 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1666 sizeof(pr->pr_hostname)); 1667 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1668 sizeof(pr->pr_domainname)); 1669 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1670 sizeof(pr->pr_hostuuid)); 1671 pr->pr_hostid = pr->pr_parent->pr_hostid; 1672 } 1673 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1674 /* Set this prison, and any descendants without PR_HOST. */ 1675 if (host != NULL) 1676 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1677 if (domain != NULL) 1678 strlcpy(pr->pr_domainname, domain, 1679 sizeof(pr->pr_domainname)); 1680 if (uuid != NULL) 1681 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1682 if (gothid) 1683 pr->pr_hostid = hid; 1684 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1685 if (tpr->pr_flags & PR_HOST) 1686 descend = 0; 1687 else { 1688 if (host != NULL) 1689 strlcpy(tpr->pr_hostname, 1690 pr->pr_hostname, 1691 sizeof(tpr->pr_hostname)); 1692 if (domain != NULL) 1693 strlcpy(tpr->pr_domainname, 1694 pr->pr_domainname, 1695 sizeof(tpr->pr_domainname)); 1696 if (uuid != NULL) 1697 strlcpy(tpr->pr_hostuuid, 1698 pr->pr_hostuuid, 1699 sizeof(tpr->pr_hostuuid)); 1700 if (gothid) 1701 tpr->pr_hostid = hid; 1702 } 1703 } 1704 } 1705 if ((tallow = ch_allow & ~pr_allow)) { 1706 /* Clear allow bits in all children. */ 1707 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1708 tpr->pr_allow &= ~tallow; 1709 } 1710 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1711 /* 1712 * Persistent prisons get an extra reference, and prisons losing their 1713 * persist flag lose that reference. Only do this for existing prisons 1714 * for now, so new ones will remain unseen until after the module 1715 * handlers have completed. 1716 */ 1717 born = pr->pr_uref == 0; 1718 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1719 if (pr_flags & PR_PERSIST) { 1720 pr->pr_ref++; 1721 pr->pr_uref++; 1722 } else { 1723 pr->pr_ref--; 1724 pr->pr_uref--; 1725 } 1726 } 1727 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1728 mtx_unlock(&pr->pr_mtx); 1729 1730 #ifdef RACCT 1731 if (racct_enable && created) 1732 prison_racct_attach(pr); 1733 #endif 1734 1735 /* Locks may have prevented a complete restriction of child IP 1736 * addresses. If so, allocate some more memory and try again. 1737 */ 1738 #ifdef INET 1739 while (redo_ip4) { 1740 ip4s = pr->pr_ip4s; 1741 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1742 mtx_lock(&pr->pr_mtx); 1743 redo_ip4 = 0; 1744 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1745 #ifdef VIMAGE 1746 if (tpr->pr_flags & PR_VNET) { 1747 descend = 0; 1748 continue; 1749 } 1750 #endif 1751 if (prison_restrict_ip4(tpr, ip4)) { 1752 if (ip4 != NULL) 1753 ip4 = NULL; 1754 else 1755 redo_ip4 = 1; 1756 } 1757 } 1758 mtx_unlock(&pr->pr_mtx); 1759 } 1760 #endif 1761 #ifdef INET6 1762 while (redo_ip6) { 1763 ip6s = pr->pr_ip6s; 1764 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1765 mtx_lock(&pr->pr_mtx); 1766 redo_ip6 = 0; 1767 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1768 #ifdef VIMAGE 1769 if (tpr->pr_flags & PR_VNET) { 1770 descend = 0; 1771 continue; 1772 } 1773 #endif 1774 if (prison_restrict_ip6(tpr, ip6)) { 1775 if (ip6 != NULL) 1776 ip6 = NULL; 1777 else 1778 redo_ip6 = 1; 1779 } 1780 } 1781 mtx_unlock(&pr->pr_mtx); 1782 } 1783 #endif 1784 1785 /* Let the modules do their work. */ 1786 sx_downgrade(&allprison_lock); 1787 if (born) { 1788 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1789 if (error) { 1790 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1791 prison_deref(pr, created 1792 ? PD_LIST_SLOCKED 1793 : PD_DEREF | PD_LIST_SLOCKED); 1794 goto done_errmsg; 1795 } 1796 } 1797 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1798 if (error) { 1799 if (born) 1800 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1801 prison_deref(pr, created 1802 ? PD_LIST_SLOCKED 1803 : PD_DEREF | PD_LIST_SLOCKED); 1804 goto done_errmsg; 1805 } 1806 1807 /* Attach this process to the prison if requested. */ 1808 if (flags & JAIL_ATTACH) { 1809 mtx_lock(&pr->pr_mtx); 1810 error = do_jail_attach(td, pr); 1811 if (error) { 1812 vfs_opterror(opts, "attach failed"); 1813 if (!created) 1814 prison_deref(pr, PD_DEREF); 1815 goto done_errmsg; 1816 } 1817 } 1818 1819 #ifdef RACCT 1820 if (racct_enable && !created) { 1821 if (!(flags & JAIL_ATTACH)) 1822 sx_sunlock(&allprison_lock); 1823 prison_racct_modify(pr); 1824 if (!(flags & JAIL_ATTACH)) 1825 sx_slock(&allprison_lock); 1826 } 1827 #endif 1828 1829 td->td_retval[0] = pr->pr_id; 1830 1831 /* 1832 * Now that it is all there, drop the temporary reference from existing 1833 * prisons. Or add a reference to newly created persistent prisons 1834 * (which was not done earlier so that the prison would not be publicly 1835 * visible). 1836 */ 1837 if (!created) { 1838 prison_deref(pr, (flags & JAIL_ATTACH) 1839 ? PD_DEREF 1840 : PD_DEREF | PD_LIST_SLOCKED); 1841 } else { 1842 if (pr_flags & PR_PERSIST) { 1843 mtx_lock(&pr->pr_mtx); 1844 pr->pr_ref++; 1845 pr->pr_uref++; 1846 mtx_unlock(&pr->pr_mtx); 1847 } 1848 if (!(flags & JAIL_ATTACH)) 1849 sx_sunlock(&allprison_lock); 1850 } 1851 1852 goto done_free; 1853 1854 done_deref_locked: 1855 prison_deref(pr, created 1856 ? PD_LOCKED | PD_LIST_XLOCKED 1857 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1858 goto done_releroot; 1859 done_unlock_list: 1860 sx_xunlock(&allprison_lock); 1861 done_releroot: 1862 if (root != NULL) 1863 vrele(root); 1864 done_errmsg: 1865 if (error) { 1866 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 1867 &errmsg_len) == 0 && errmsg_len > 0) { 1868 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1869 if (optuio->uio_segflg == UIO_SYSSPACE) 1870 bcopy(errmsg, 1871 optuio->uio_iov[errmsg_pos].iov_base, 1872 errmsg_len); 1873 else 1874 copyout(errmsg, 1875 optuio->uio_iov[errmsg_pos].iov_base, 1876 errmsg_len); 1877 } 1878 } 1879 done_free: 1880 #ifdef INET 1881 free(ip4, M_PRISON); 1882 #endif 1883 #ifdef INET6 1884 free(ip6, M_PRISON); 1885 #endif 1886 if (g_path != NULL) 1887 free(g_path, M_TEMP); 1888 vfs_freeopts(opts); 1889 return (error); 1890 } 1891 1892 1893 /* 1894 * struct jail_get_args { 1895 * struct iovec *iovp; 1896 * unsigned int iovcnt; 1897 * int flags; 1898 * }; 1899 */ 1900 int 1901 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1902 { 1903 struct uio *auio; 1904 int error; 1905 1906 /* Check that we have an even number of iovecs. */ 1907 if (uap->iovcnt & 1) 1908 return (EINVAL); 1909 1910 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1911 if (error) 1912 return (error); 1913 error = kern_jail_get(td, auio, uap->flags); 1914 if (error == 0) 1915 error = copyout(auio->uio_iov, uap->iovp, 1916 uap->iovcnt * sizeof (struct iovec)); 1917 free(auio, M_IOV); 1918 return (error); 1919 } 1920 1921 int 1922 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1923 { 1924 struct bool_flags *bf; 1925 struct jailsys_flags *jsf; 1926 struct prison *pr, *mypr; 1927 struct vfsopt *opt; 1928 struct vfsoptlist *opts; 1929 char *errmsg, *name; 1930 int error, errmsg_len, errmsg_pos, i, jid, len, locked, pos; 1931 unsigned f; 1932 1933 if (flags & ~JAIL_GET_MASK) 1934 return (EINVAL); 1935 1936 /* Get the parameter list. */ 1937 error = vfs_buildopts(optuio, &opts); 1938 if (error) 1939 return (error); 1940 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1941 mypr = td->td_ucred->cr_prison; 1942 1943 /* 1944 * Find the prison specified by one of: lastjid, jid, name. 1945 */ 1946 sx_slock(&allprison_lock); 1947 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1948 if (error == 0) { 1949 TAILQ_FOREACH(pr, &allprison, pr_list) { 1950 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1951 mtx_lock(&pr->pr_mtx); 1952 if (pr->pr_ref > 0 && 1953 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1954 break; 1955 mtx_unlock(&pr->pr_mtx); 1956 } 1957 } 1958 if (pr != NULL) 1959 goto found_prison; 1960 error = ENOENT; 1961 vfs_opterror(opts, "no jail after %d", jid); 1962 goto done_unlock_list; 1963 } else if (error != ENOENT) 1964 goto done_unlock_list; 1965 1966 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1967 if (error == 0) { 1968 if (jid != 0) { 1969 pr = prison_find_child(mypr, jid); 1970 if (pr != NULL) { 1971 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1972 mtx_unlock(&pr->pr_mtx); 1973 error = ENOENT; 1974 vfs_opterror(opts, "jail %d is dying", 1975 jid); 1976 goto done_unlock_list; 1977 } 1978 goto found_prison; 1979 } 1980 error = ENOENT; 1981 vfs_opterror(opts, "jail %d not found", jid); 1982 goto done_unlock_list; 1983 } 1984 } else if (error != ENOENT) 1985 goto done_unlock_list; 1986 1987 error = vfs_getopt(opts, "name", (void **)&name, &len); 1988 if (error == 0) { 1989 if (len == 0 || name[len - 1] != '\0') { 1990 error = EINVAL; 1991 goto done_unlock_list; 1992 } 1993 pr = prison_find_name(mypr, name); 1994 if (pr != NULL) { 1995 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1996 mtx_unlock(&pr->pr_mtx); 1997 error = ENOENT; 1998 vfs_opterror(opts, "jail \"%s\" is dying", 1999 name); 2000 goto done_unlock_list; 2001 } 2002 goto found_prison; 2003 } 2004 error = ENOENT; 2005 vfs_opterror(opts, "jail \"%s\" not found", name); 2006 goto done_unlock_list; 2007 } else if (error != ENOENT) 2008 goto done_unlock_list; 2009 2010 vfs_opterror(opts, "no jail specified"); 2011 error = ENOENT; 2012 goto done_unlock_list; 2013 2014 found_prison: 2015 /* Get the parameters of the prison. */ 2016 pr->pr_ref++; 2017 locked = PD_LOCKED; 2018 td->td_retval[0] = pr->pr_id; 2019 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2020 if (error != 0 && error != ENOENT) 2021 goto done_deref; 2022 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2023 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2024 if (error != 0 && error != ENOENT) 2025 goto done_deref; 2026 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2027 if (error != 0 && error != ENOENT) 2028 goto done_deref; 2029 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2030 sizeof(pr->pr_cpuset->cs_id)); 2031 if (error != 0 && error != ENOENT) 2032 goto done_deref; 2033 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2034 if (error != 0 && error != ENOENT) 2035 goto done_deref; 2036 #ifdef INET 2037 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2038 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2039 if (error != 0 && error != ENOENT) 2040 goto done_deref; 2041 #endif 2042 #ifdef INET6 2043 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2044 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2045 if (error != 0 && error != ENOENT) 2046 goto done_deref; 2047 #endif 2048 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2049 sizeof(pr->pr_securelevel)); 2050 if (error != 0 && error != ENOENT) 2051 goto done_deref; 2052 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2053 sizeof(pr->pr_childcount)); 2054 if (error != 0 && error != ENOENT) 2055 goto done_deref; 2056 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2057 sizeof(pr->pr_childmax)); 2058 if (error != 0 && error != ENOENT) 2059 goto done_deref; 2060 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2061 if (error != 0 && error != ENOENT) 2062 goto done_deref; 2063 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2064 if (error != 0 && error != ENOENT) 2065 goto done_deref; 2066 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2067 if (error != 0 && error != ENOENT) 2068 goto done_deref; 2069 #ifdef COMPAT_FREEBSD32 2070 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2071 uint32_t hid32 = pr->pr_hostid; 2072 2073 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2074 } else 2075 #endif 2076 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2077 sizeof(pr->pr_hostid)); 2078 if (error != 0 && error != ENOENT) 2079 goto done_deref; 2080 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2081 sizeof(pr->pr_enforce_statfs)); 2082 if (error != 0 && error != ENOENT) 2083 goto done_deref; 2084 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2085 sizeof(pr->pr_devfs_rsnum)); 2086 if (error != 0 && error != ENOENT) 2087 goto done_deref; 2088 for (bf = pr_flag_bool; 2089 bf < pr_flag_bool + nitems(pr_flag_bool); 2090 bf++) { 2091 i = (pr->pr_flags & bf->flag) ? 1 : 0; 2092 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2093 if (error != 0 && error != ENOENT) 2094 goto done_deref; 2095 i = !i; 2096 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2097 if (error != 0 && error != ENOENT) 2098 goto done_deref; 2099 } 2100 for (jsf = pr_flag_jailsys; 2101 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 2102 jsf++) { 2103 f = pr->pr_flags & (jsf->disable | jsf->new); 2104 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE 2105 : (f == jsf->new) ? JAIL_SYS_NEW 2106 : JAIL_SYS_INHERIT; 2107 error = vfs_setopt(opts, jsf->name, &i, sizeof(i)); 2108 if (error != 0 && error != ENOENT) 2109 goto done_deref; 2110 } 2111 for (bf = pr_flag_allow; 2112 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 2113 bf++) { 2114 i = (pr->pr_allow & bf->flag) ? 1 : 0; 2115 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2116 if (error != 0 && error != ENOENT) 2117 goto done_deref; 2118 i = !i; 2119 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2120 if (error != 0 && error != ENOENT) 2121 goto done_deref; 2122 } 2123 i = (pr->pr_uref == 0); 2124 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2125 if (error != 0 && error != ENOENT) 2126 goto done_deref; 2127 i = !i; 2128 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2129 if (error != 0 && error != ENOENT) 2130 goto done_deref; 2131 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2132 sizeof(pr->pr_osreldate)); 2133 if (error != 0 && error != ENOENT) 2134 goto done_deref; 2135 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2136 if (error != 0 && error != ENOENT) 2137 goto done_deref; 2138 2139 /* Get the module parameters. */ 2140 mtx_unlock(&pr->pr_mtx); 2141 locked = 0; 2142 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2143 if (error) 2144 goto done_deref; 2145 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2146 2147 /* By now, all parameters should have been noted. */ 2148 TAILQ_FOREACH(opt, opts, link) { 2149 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2150 error = EINVAL; 2151 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2152 goto done_errmsg; 2153 } 2154 } 2155 2156 /* Write the fetched parameters back to userspace. */ 2157 error = 0; 2158 TAILQ_FOREACH(opt, opts, link) { 2159 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2160 pos = 2 * opt->pos + 1; 2161 optuio->uio_iov[pos].iov_len = opt->len; 2162 if (opt->value != NULL) { 2163 if (optuio->uio_segflg == UIO_SYSSPACE) { 2164 bcopy(opt->value, 2165 optuio->uio_iov[pos].iov_base, 2166 opt->len); 2167 } else { 2168 error = copyout(opt->value, 2169 optuio->uio_iov[pos].iov_base, 2170 opt->len); 2171 if (error) 2172 break; 2173 } 2174 } 2175 } 2176 } 2177 goto done_errmsg; 2178 2179 done_deref: 2180 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2181 goto done_errmsg; 2182 2183 done_unlock_list: 2184 sx_sunlock(&allprison_lock); 2185 done_errmsg: 2186 if (error && errmsg_pos >= 0) { 2187 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2188 errmsg_pos = 2 * errmsg_pos + 1; 2189 if (errmsg_len > 0) { 2190 if (optuio->uio_segflg == UIO_SYSSPACE) 2191 bcopy(errmsg, 2192 optuio->uio_iov[errmsg_pos].iov_base, 2193 errmsg_len); 2194 else 2195 copyout(errmsg, 2196 optuio->uio_iov[errmsg_pos].iov_base, 2197 errmsg_len); 2198 } 2199 } 2200 vfs_freeopts(opts); 2201 return (error); 2202 } 2203 2204 2205 /* 2206 * struct jail_remove_args { 2207 * int jid; 2208 * }; 2209 */ 2210 int 2211 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2212 { 2213 struct prison *pr, *cpr, *lpr, *tpr; 2214 int descend, error; 2215 2216 error = priv_check(td, PRIV_JAIL_REMOVE); 2217 if (error) 2218 return (error); 2219 2220 sx_xlock(&allprison_lock); 2221 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2222 if (pr == NULL) { 2223 sx_xunlock(&allprison_lock); 2224 return (EINVAL); 2225 } 2226 2227 /* Remove all descendants of this prison, then remove this prison. */ 2228 pr->pr_ref++; 2229 if (!LIST_EMPTY(&pr->pr_children)) { 2230 mtx_unlock(&pr->pr_mtx); 2231 lpr = NULL; 2232 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2233 mtx_lock(&cpr->pr_mtx); 2234 if (cpr->pr_ref > 0) { 2235 tpr = cpr; 2236 cpr->pr_ref++; 2237 } else { 2238 /* Already removed - do not do it again. */ 2239 tpr = NULL; 2240 } 2241 mtx_unlock(&cpr->pr_mtx); 2242 if (lpr != NULL) { 2243 mtx_lock(&lpr->pr_mtx); 2244 prison_remove_one(lpr); 2245 sx_xlock(&allprison_lock); 2246 } 2247 lpr = tpr; 2248 } 2249 if (lpr != NULL) { 2250 mtx_lock(&lpr->pr_mtx); 2251 prison_remove_one(lpr); 2252 sx_xlock(&allprison_lock); 2253 } 2254 mtx_lock(&pr->pr_mtx); 2255 } 2256 prison_remove_one(pr); 2257 return (0); 2258 } 2259 2260 static void 2261 prison_remove_one(struct prison *pr) 2262 { 2263 struct proc *p; 2264 int deuref; 2265 2266 /* If the prison was persistent, it is not anymore. */ 2267 deuref = 0; 2268 if (pr->pr_flags & PR_PERSIST) { 2269 pr->pr_ref--; 2270 deuref = PD_DEUREF; 2271 pr->pr_flags &= ~PR_PERSIST; 2272 } 2273 2274 /* 2275 * jail_remove added a reference. If that's the only one, remove 2276 * the prison now. 2277 */ 2278 KASSERT(pr->pr_ref > 0, 2279 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2280 if (pr->pr_ref == 1) { 2281 prison_deref(pr, 2282 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2283 return; 2284 } 2285 2286 mtx_unlock(&pr->pr_mtx); 2287 sx_xunlock(&allprison_lock); 2288 /* 2289 * Kill all processes unfortunate enough to be attached to this prison. 2290 */ 2291 sx_slock(&allproc_lock); 2292 FOREACH_PROC_IN_SYSTEM(p) { 2293 PROC_LOCK(p); 2294 if (p->p_state != PRS_NEW && p->p_ucred && 2295 p->p_ucred->cr_prison == pr) 2296 kern_psignal(p, SIGKILL); 2297 PROC_UNLOCK(p); 2298 } 2299 sx_sunlock(&allproc_lock); 2300 /* Remove the temporary reference added by jail_remove. */ 2301 prison_deref(pr, deuref | PD_DEREF); 2302 } 2303 2304 2305 /* 2306 * struct jail_attach_args { 2307 * int jid; 2308 * }; 2309 */ 2310 int 2311 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2312 { 2313 struct prison *pr; 2314 int error; 2315 2316 error = priv_check(td, PRIV_JAIL_ATTACH); 2317 if (error) 2318 return (error); 2319 2320 /* 2321 * Start with exclusive hold on allprison_lock to ensure that a possible 2322 * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove. 2323 * But then immediately downgrade it since we don't need to stop 2324 * readers. 2325 */ 2326 sx_xlock(&allprison_lock); 2327 sx_downgrade(&allprison_lock); 2328 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2329 if (pr == NULL) { 2330 sx_sunlock(&allprison_lock); 2331 return (EINVAL); 2332 } 2333 2334 /* 2335 * Do not allow a process to attach to a prison that is not 2336 * considered to be "alive". 2337 */ 2338 if (pr->pr_uref == 0) { 2339 mtx_unlock(&pr->pr_mtx); 2340 sx_sunlock(&allprison_lock); 2341 return (EINVAL); 2342 } 2343 2344 return (do_jail_attach(td, pr)); 2345 } 2346 2347 static int 2348 do_jail_attach(struct thread *td, struct prison *pr) 2349 { 2350 struct proc *p; 2351 struct ucred *newcred, *oldcred; 2352 int error; 2353 2354 /* 2355 * XXX: Note that there is a slight race here if two threads 2356 * in the same privileged process attempt to attach to two 2357 * different jails at the same time. It is important for 2358 * user processes not to do this, or they might end up with 2359 * a process root from one prison, but attached to the jail 2360 * of another. 2361 */ 2362 pr->pr_ref++; 2363 pr->pr_uref++; 2364 mtx_unlock(&pr->pr_mtx); 2365 2366 /* Let modules do whatever they need to prepare for attaching. */ 2367 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2368 if (error) { 2369 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2370 return (error); 2371 } 2372 sx_sunlock(&allprison_lock); 2373 2374 /* 2375 * Reparent the newly attached process to this jail. 2376 */ 2377 p = td->td_proc; 2378 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2379 if (error) 2380 goto e_revert_osd; 2381 2382 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2383 if ((error = change_dir(pr->pr_root, td)) != 0) 2384 goto e_unlock; 2385 #ifdef MAC 2386 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2387 goto e_unlock; 2388 #endif 2389 VOP_UNLOCK(pr->pr_root, 0); 2390 if ((error = pwd_chroot(td, pr->pr_root))) 2391 goto e_revert_osd; 2392 2393 newcred = crget(); 2394 PROC_LOCK(p); 2395 oldcred = crcopysafe(p, newcred); 2396 newcred->cr_prison = pr; 2397 proc_set_cred(p, newcred); 2398 setsugid(p); 2399 #ifdef RACCT 2400 racct_proc_ucred_changed(p, oldcred, newcred); 2401 crhold(newcred); 2402 #endif 2403 PROC_UNLOCK(p); 2404 #ifdef RCTL 2405 rctl_proc_ucred_changed(p, newcred); 2406 crfree(newcred); 2407 #endif 2408 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF); 2409 crfree(oldcred); 2410 return (0); 2411 2412 e_unlock: 2413 VOP_UNLOCK(pr->pr_root, 0); 2414 e_revert_osd: 2415 /* Tell modules this thread is still in its old jail after all. */ 2416 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2417 prison_deref(pr, PD_DEREF | PD_DEUREF); 2418 return (error); 2419 } 2420 2421 2422 /* 2423 * Returns a locked prison instance, or NULL on failure. 2424 */ 2425 struct prison * 2426 prison_find(int prid) 2427 { 2428 struct prison *pr; 2429 2430 sx_assert(&allprison_lock, SX_LOCKED); 2431 TAILQ_FOREACH(pr, &allprison, pr_list) { 2432 if (pr->pr_id == prid) { 2433 mtx_lock(&pr->pr_mtx); 2434 if (pr->pr_ref > 0) 2435 return (pr); 2436 mtx_unlock(&pr->pr_mtx); 2437 } 2438 } 2439 return (NULL); 2440 } 2441 2442 /* 2443 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2444 */ 2445 struct prison * 2446 prison_find_child(struct prison *mypr, int prid) 2447 { 2448 struct prison *pr; 2449 int descend; 2450 2451 sx_assert(&allprison_lock, SX_LOCKED); 2452 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2453 if (pr->pr_id == prid) { 2454 mtx_lock(&pr->pr_mtx); 2455 if (pr->pr_ref > 0) 2456 return (pr); 2457 mtx_unlock(&pr->pr_mtx); 2458 } 2459 } 2460 return (NULL); 2461 } 2462 2463 /* 2464 * Look for the name relative to mypr. Returns a locked prison or NULL. 2465 */ 2466 struct prison * 2467 prison_find_name(struct prison *mypr, const char *name) 2468 { 2469 struct prison *pr, *deadpr; 2470 size_t mylen; 2471 int descend; 2472 2473 sx_assert(&allprison_lock, SX_LOCKED); 2474 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2475 again: 2476 deadpr = NULL; 2477 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2478 if (!strcmp(pr->pr_name + mylen, name)) { 2479 mtx_lock(&pr->pr_mtx); 2480 if (pr->pr_ref > 0) { 2481 if (pr->pr_uref > 0) 2482 return (pr); 2483 deadpr = pr; 2484 } 2485 mtx_unlock(&pr->pr_mtx); 2486 } 2487 } 2488 /* There was no valid prison - perhaps there was a dying one. */ 2489 if (deadpr != NULL) { 2490 mtx_lock(&deadpr->pr_mtx); 2491 if (deadpr->pr_ref == 0) { 2492 mtx_unlock(&deadpr->pr_mtx); 2493 goto again; 2494 } 2495 } 2496 return (deadpr); 2497 } 2498 2499 /* 2500 * See if a prison has the specific flag set. 2501 */ 2502 int 2503 prison_flag(struct ucred *cred, unsigned flag) 2504 { 2505 2506 /* This is an atomic read, so no locking is necessary. */ 2507 return (cred->cr_prison->pr_flags & flag); 2508 } 2509 2510 int 2511 prison_allow(struct ucred *cred, unsigned flag) 2512 { 2513 2514 /* This is an atomic read, so no locking is necessary. */ 2515 return (cred->cr_prison->pr_allow & flag); 2516 } 2517 2518 /* 2519 * Remove a prison reference. If that was the last reference, remove the 2520 * prison itself - but not in this context in case there are locks held. 2521 */ 2522 void 2523 prison_free_locked(struct prison *pr) 2524 { 2525 int ref; 2526 2527 mtx_assert(&pr->pr_mtx, MA_OWNED); 2528 ref = --pr->pr_ref; 2529 mtx_unlock(&pr->pr_mtx); 2530 if (ref == 0) 2531 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2532 } 2533 2534 void 2535 prison_free(struct prison *pr) 2536 { 2537 2538 mtx_lock(&pr->pr_mtx); 2539 prison_free_locked(pr); 2540 } 2541 2542 /* 2543 * Complete a call to either prison_free or prison_proc_free. 2544 */ 2545 static void 2546 prison_complete(void *context, int pending) 2547 { 2548 struct prison *pr = context; 2549 2550 sx_xlock(&allprison_lock); 2551 mtx_lock(&pr->pr_mtx); 2552 prison_deref(pr, pr->pr_uref 2553 ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED 2554 : PD_LOCKED | PD_LIST_XLOCKED); 2555 } 2556 2557 /* 2558 * Remove a prison reference (usually). This internal version assumes no 2559 * mutexes are held, except perhaps the prison itself. If there are no more 2560 * references, release and delist the prison. On completion, the prison lock 2561 * and the allprison lock are both unlocked. 2562 */ 2563 static void 2564 prison_deref(struct prison *pr, int flags) 2565 { 2566 struct prison *ppr, *tpr; 2567 int ref, lasturef; 2568 2569 if (!(flags & PD_LOCKED)) 2570 mtx_lock(&pr->pr_mtx); 2571 for (;;) { 2572 if (flags & PD_DEUREF) { 2573 KASSERT(pr->pr_uref > 0, 2574 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 2575 pr->pr_id)); 2576 pr->pr_uref--; 2577 lasturef = pr->pr_uref == 0; 2578 if (lasturef) 2579 pr->pr_ref++; 2580 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2581 } else 2582 lasturef = 0; 2583 if (flags & PD_DEREF) { 2584 KASSERT(pr->pr_ref > 0, 2585 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 2586 pr->pr_id)); 2587 pr->pr_ref--; 2588 } 2589 ref = pr->pr_ref; 2590 mtx_unlock(&pr->pr_mtx); 2591 2592 /* 2593 * Tell the modules if the last user reference was removed 2594 * (even it sticks around in dying state). 2595 */ 2596 if (lasturef) { 2597 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) { 2598 sx_xlock(&allprison_lock); 2599 flags |= PD_LIST_XLOCKED; 2600 } 2601 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 2602 mtx_lock(&pr->pr_mtx); 2603 ref = --pr->pr_ref; 2604 mtx_unlock(&pr->pr_mtx); 2605 } 2606 2607 /* If the prison still has references, nothing else to do. */ 2608 if (ref > 0) { 2609 if (flags & PD_LIST_SLOCKED) 2610 sx_sunlock(&allprison_lock); 2611 else if (flags & PD_LIST_XLOCKED) 2612 sx_xunlock(&allprison_lock); 2613 return; 2614 } 2615 2616 if (flags & PD_LIST_SLOCKED) { 2617 if (!sx_try_upgrade(&allprison_lock)) { 2618 sx_sunlock(&allprison_lock); 2619 sx_xlock(&allprison_lock); 2620 } 2621 } else if (!(flags & PD_LIST_XLOCKED)) 2622 sx_xlock(&allprison_lock); 2623 2624 TAILQ_REMOVE(&allprison, pr, pr_list); 2625 LIST_REMOVE(pr, pr_sibling); 2626 ppr = pr->pr_parent; 2627 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2628 tpr->pr_childcount--; 2629 sx_xunlock(&allprison_lock); 2630 2631 #ifdef VIMAGE 2632 if (pr->pr_vnet != ppr->pr_vnet) 2633 vnet_destroy(pr->pr_vnet); 2634 #endif 2635 if (pr->pr_root != NULL) 2636 vrele(pr->pr_root); 2637 mtx_destroy(&pr->pr_mtx); 2638 #ifdef INET 2639 free(pr->pr_ip4, M_PRISON); 2640 #endif 2641 #ifdef INET6 2642 free(pr->pr_ip6, M_PRISON); 2643 #endif 2644 if (pr->pr_cpuset != NULL) 2645 cpuset_rel(pr->pr_cpuset); 2646 osd_jail_exit(pr); 2647 #ifdef RACCT 2648 if (racct_enable) 2649 prison_racct_detach(pr); 2650 #endif 2651 free(pr, M_PRISON); 2652 2653 /* Removing a prison frees a reference on its parent. */ 2654 pr = ppr; 2655 mtx_lock(&pr->pr_mtx); 2656 flags = PD_DEREF | PD_DEUREF; 2657 } 2658 } 2659 2660 void 2661 prison_hold_locked(struct prison *pr) 2662 { 2663 2664 mtx_assert(&pr->pr_mtx, MA_OWNED); 2665 KASSERT(pr->pr_ref > 0, 2666 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id)); 2667 pr->pr_ref++; 2668 } 2669 2670 void 2671 prison_hold(struct prison *pr) 2672 { 2673 2674 mtx_lock(&pr->pr_mtx); 2675 prison_hold_locked(pr); 2676 mtx_unlock(&pr->pr_mtx); 2677 } 2678 2679 void 2680 prison_proc_hold(struct prison *pr) 2681 { 2682 2683 mtx_lock(&pr->pr_mtx); 2684 KASSERT(pr->pr_uref > 0, 2685 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2686 pr->pr_uref++; 2687 mtx_unlock(&pr->pr_mtx); 2688 } 2689 2690 void 2691 prison_proc_free(struct prison *pr) 2692 { 2693 2694 mtx_lock(&pr->pr_mtx); 2695 KASSERT(pr->pr_uref > 0, 2696 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2697 if (pr->pr_uref > 1) 2698 pr->pr_uref--; 2699 else { 2700 /* 2701 * Don't remove the last user reference in this context, which 2702 * is expected to be a process that is not only locked, but 2703 * also half dead. 2704 */ 2705 pr->pr_ref++; 2706 mtx_unlock(&pr->pr_mtx); 2707 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2708 return; 2709 } 2710 mtx_unlock(&pr->pr_mtx); 2711 } 2712 2713 /* 2714 * Check if a jail supports the given address family. 2715 * 2716 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 2717 * if not. 2718 */ 2719 int 2720 prison_check_af(struct ucred *cred, int af) 2721 { 2722 struct prison *pr; 2723 int error; 2724 2725 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2726 2727 pr = cred->cr_prison; 2728 #ifdef VIMAGE 2729 /* Prisons with their own network stack are not limited. */ 2730 if (prison_owns_vnet(cred)) 2731 return (0); 2732 #endif 2733 2734 error = 0; 2735 switch (af) 2736 { 2737 #ifdef INET 2738 case AF_INET: 2739 if (pr->pr_flags & PR_IP4) 2740 { 2741 mtx_lock(&pr->pr_mtx); 2742 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 2743 error = EAFNOSUPPORT; 2744 mtx_unlock(&pr->pr_mtx); 2745 } 2746 break; 2747 #endif 2748 #ifdef INET6 2749 case AF_INET6: 2750 if (pr->pr_flags & PR_IP6) 2751 { 2752 mtx_lock(&pr->pr_mtx); 2753 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 2754 error = EAFNOSUPPORT; 2755 mtx_unlock(&pr->pr_mtx); 2756 } 2757 break; 2758 #endif 2759 case AF_LOCAL: 2760 case AF_ROUTE: 2761 break; 2762 default: 2763 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 2764 error = EAFNOSUPPORT; 2765 } 2766 return (error); 2767 } 2768 2769 /* 2770 * Check if given address belongs to the jail referenced by cred (wrapper to 2771 * prison_check_ip[46]). 2772 * 2773 * Returns 0 if jail doesn't restrict the address family or if address belongs 2774 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 2775 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 2776 */ 2777 int 2778 prison_if(struct ucred *cred, struct sockaddr *sa) 2779 { 2780 #ifdef INET 2781 struct sockaddr_in *sai; 2782 #endif 2783 #ifdef INET6 2784 struct sockaddr_in6 *sai6; 2785 #endif 2786 int error; 2787 2788 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2789 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 2790 2791 #ifdef VIMAGE 2792 if (prison_owns_vnet(cred)) 2793 return (0); 2794 #endif 2795 2796 error = 0; 2797 switch (sa->sa_family) 2798 { 2799 #ifdef INET 2800 case AF_INET: 2801 sai = (struct sockaddr_in *)sa; 2802 error = prison_check_ip4(cred, &sai->sin_addr); 2803 break; 2804 #endif 2805 #ifdef INET6 2806 case AF_INET6: 2807 sai6 = (struct sockaddr_in6 *)sa; 2808 error = prison_check_ip6(cred, &sai6->sin6_addr); 2809 break; 2810 #endif 2811 default: 2812 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 2813 error = EAFNOSUPPORT; 2814 } 2815 return (error); 2816 } 2817 2818 /* 2819 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 2820 */ 2821 int 2822 prison_check(struct ucred *cred1, struct ucred *cred2) 2823 { 2824 2825 return ((cred1->cr_prison == cred2->cr_prison || 2826 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 2827 } 2828 2829 /* 2830 * Return 1 if p2 is a child of p1, otherwise 0. 2831 */ 2832 int 2833 prison_ischild(struct prison *pr1, struct prison *pr2) 2834 { 2835 2836 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 2837 if (pr1 == pr2) 2838 return (1); 2839 return (0); 2840 } 2841 2842 /* 2843 * Return 1 if the passed credential is in a jail, otherwise 0. 2844 */ 2845 int 2846 jailed(struct ucred *cred) 2847 { 2848 2849 return (cred->cr_prison != &prison0); 2850 } 2851 2852 /* 2853 * Return 1 if the passed credential is in a jail and that jail does not 2854 * have its own virtual network stack, otherwise 0. 2855 */ 2856 int 2857 jailed_without_vnet(struct ucred *cred) 2858 { 2859 2860 if (!jailed(cred)) 2861 return (0); 2862 #ifdef VIMAGE 2863 if (prison_owns_vnet(cred)) 2864 return (0); 2865 #endif 2866 2867 return (1); 2868 } 2869 2870 /* 2871 * Return the correct hostname (domainname, et al) for the passed credential. 2872 */ 2873 void 2874 getcredhostname(struct ucred *cred, char *buf, size_t size) 2875 { 2876 struct prison *pr; 2877 2878 /* 2879 * A NULL credential can be used to shortcut to the physical 2880 * system's hostname. 2881 */ 2882 pr = (cred != NULL) ? cred->cr_prison : &prison0; 2883 mtx_lock(&pr->pr_mtx); 2884 strlcpy(buf, pr->pr_hostname, size); 2885 mtx_unlock(&pr->pr_mtx); 2886 } 2887 2888 void 2889 getcreddomainname(struct ucred *cred, char *buf, size_t size) 2890 { 2891 2892 mtx_lock(&cred->cr_prison->pr_mtx); 2893 strlcpy(buf, cred->cr_prison->pr_domainname, size); 2894 mtx_unlock(&cred->cr_prison->pr_mtx); 2895 } 2896 2897 void 2898 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 2899 { 2900 2901 mtx_lock(&cred->cr_prison->pr_mtx); 2902 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 2903 mtx_unlock(&cred->cr_prison->pr_mtx); 2904 } 2905 2906 void 2907 getcredhostid(struct ucred *cred, unsigned long *hostid) 2908 { 2909 2910 mtx_lock(&cred->cr_prison->pr_mtx); 2911 *hostid = cred->cr_prison->pr_hostid; 2912 mtx_unlock(&cred->cr_prison->pr_mtx); 2913 } 2914 2915 #ifdef VIMAGE 2916 /* 2917 * Determine whether the prison represented by cred owns 2918 * its vnet rather than having it inherited. 2919 * 2920 * Returns 1 in case the prison owns the vnet, 0 otherwise. 2921 */ 2922 int 2923 prison_owns_vnet(struct ucred *cred) 2924 { 2925 2926 /* 2927 * vnets cannot be added/removed after jail creation, 2928 * so no need to lock here. 2929 */ 2930 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 2931 } 2932 #endif 2933 2934 /* 2935 * Determine whether the subject represented by cred can "see" 2936 * status of a mount point. 2937 * Returns: 0 for permitted, ENOENT otherwise. 2938 * XXX: This function should be called cr_canseemount() and should be 2939 * placed in kern_prot.c. 2940 */ 2941 int 2942 prison_canseemount(struct ucred *cred, struct mount *mp) 2943 { 2944 struct prison *pr; 2945 struct statfs *sp; 2946 size_t len; 2947 2948 pr = cred->cr_prison; 2949 if (pr->pr_enforce_statfs == 0) 2950 return (0); 2951 if (pr->pr_root->v_mount == mp) 2952 return (0); 2953 if (pr->pr_enforce_statfs == 2) 2954 return (ENOENT); 2955 /* 2956 * If jail's chroot directory is set to "/" we should be able to see 2957 * all mount-points from inside a jail. 2958 * This is ugly check, but this is the only situation when jail's 2959 * directory ends with '/'. 2960 */ 2961 if (strcmp(pr->pr_path, "/") == 0) 2962 return (0); 2963 len = strlen(pr->pr_path); 2964 sp = &mp->mnt_stat; 2965 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 2966 return (ENOENT); 2967 /* 2968 * Be sure that we don't have situation where jail's root directory 2969 * is "/some/path" and mount point is "/some/pathpath". 2970 */ 2971 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 2972 return (ENOENT); 2973 return (0); 2974 } 2975 2976 void 2977 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 2978 { 2979 char jpath[MAXPATHLEN]; 2980 struct prison *pr; 2981 size_t len; 2982 2983 pr = cred->cr_prison; 2984 if (pr->pr_enforce_statfs == 0) 2985 return; 2986 if (prison_canseemount(cred, mp) != 0) { 2987 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 2988 strlcpy(sp->f_mntonname, "[restricted]", 2989 sizeof(sp->f_mntonname)); 2990 return; 2991 } 2992 if (pr->pr_root->v_mount == mp) { 2993 /* 2994 * Clear current buffer data, so we are sure nothing from 2995 * the valid path left there. 2996 */ 2997 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 2998 *sp->f_mntonname = '/'; 2999 return; 3000 } 3001 /* 3002 * If jail's chroot directory is set to "/" we should be able to see 3003 * all mount-points from inside a jail. 3004 */ 3005 if (strcmp(pr->pr_path, "/") == 0) 3006 return; 3007 len = strlen(pr->pr_path); 3008 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3009 /* 3010 * Clear current buffer data, so we are sure nothing from 3011 * the valid path left there. 3012 */ 3013 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3014 if (*jpath == '\0') { 3015 /* Should never happen. */ 3016 *sp->f_mntonname = '/'; 3017 } else { 3018 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3019 } 3020 } 3021 3022 /* 3023 * Check with permission for a specific privilege is granted within jail. We 3024 * have a specific list of accepted privileges; the rest are denied. 3025 */ 3026 int 3027 prison_priv_check(struct ucred *cred, int priv) 3028 { 3029 3030 if (!jailed(cred)) 3031 return (0); 3032 3033 #ifdef VIMAGE 3034 /* 3035 * Privileges specific to prisons with a virtual network stack. 3036 * There might be a duplicate entry here in case the privilege 3037 * is only granted conditionally in the legacy jail case. 3038 */ 3039 switch (priv) { 3040 #ifdef notyet 3041 /* 3042 * NFS-specific privileges. 3043 */ 3044 case PRIV_NFS_DAEMON: 3045 case PRIV_NFS_LOCKD: 3046 #endif 3047 /* 3048 * Network stack privileges. 3049 */ 3050 case PRIV_NET_BRIDGE: 3051 case PRIV_NET_GRE: 3052 case PRIV_NET_BPF: 3053 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3054 case PRIV_NET_ROUTE: 3055 case PRIV_NET_TAP: 3056 case PRIV_NET_SETIFMTU: 3057 case PRIV_NET_SETIFFLAGS: 3058 case PRIV_NET_SETIFCAP: 3059 case PRIV_NET_SETIFDESCR: 3060 case PRIV_NET_SETIFNAME : 3061 case PRIV_NET_SETIFMETRIC: 3062 case PRIV_NET_SETIFPHYS: 3063 case PRIV_NET_SETIFMAC: 3064 case PRIV_NET_ADDMULTI: 3065 case PRIV_NET_DELMULTI: 3066 case PRIV_NET_HWIOCTL: 3067 case PRIV_NET_SETLLADDR: 3068 case PRIV_NET_ADDIFGROUP: 3069 case PRIV_NET_DELIFGROUP: 3070 case PRIV_NET_IFCREATE: 3071 case PRIV_NET_IFDESTROY: 3072 case PRIV_NET_ADDIFADDR: 3073 case PRIV_NET_DELIFADDR: 3074 case PRIV_NET_LAGG: 3075 case PRIV_NET_GIF: 3076 case PRIV_NET_SETIFVNET: 3077 case PRIV_NET_SETIFFIB: 3078 3079 /* 3080 * 802.11-related privileges. 3081 */ 3082 case PRIV_NET80211_GETKEY: 3083 #ifdef notyet 3084 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3085 #endif 3086 3087 #ifdef notyet 3088 /* 3089 * ATM privileges. 3090 */ 3091 case PRIV_NETATM_CFG: 3092 case PRIV_NETATM_ADD: 3093 case PRIV_NETATM_DEL: 3094 case PRIV_NETATM_SET: 3095 3096 /* 3097 * Bluetooth privileges. 3098 */ 3099 case PRIV_NETBLUETOOTH_RAW: 3100 #endif 3101 3102 /* 3103 * Netgraph and netgraph module privileges. 3104 */ 3105 case PRIV_NETGRAPH_CONTROL: 3106 #ifdef notyet 3107 case PRIV_NETGRAPH_TTY: 3108 #endif 3109 3110 /* 3111 * IPv4 and IPv6 privileges. 3112 */ 3113 case PRIV_NETINET_IPFW: 3114 case PRIV_NETINET_DIVERT: 3115 case PRIV_NETINET_PF: 3116 case PRIV_NETINET_DUMMYNET: 3117 case PRIV_NETINET_CARP: 3118 case PRIV_NETINET_MROUTE: 3119 case PRIV_NETINET_RAW: 3120 case PRIV_NETINET_ADDRCTRL6: 3121 case PRIV_NETINET_ND6: 3122 case PRIV_NETINET_SCOPE6: 3123 case PRIV_NETINET_ALIFETIME6: 3124 case PRIV_NETINET_IPSEC: 3125 case PRIV_NETINET_BINDANY: 3126 3127 #ifdef notyet 3128 /* 3129 * NCP privileges. 3130 */ 3131 case PRIV_NETNCP: 3132 3133 /* 3134 * SMB privileges. 3135 */ 3136 case PRIV_NETSMB: 3137 #endif 3138 3139 /* 3140 * No default: or deny here. 3141 * In case of no permit fall through to next switch(). 3142 */ 3143 if (cred->cr_prison->pr_flags & PR_VNET) 3144 return (0); 3145 } 3146 #endif /* VIMAGE */ 3147 3148 switch (priv) { 3149 3150 /* 3151 * Allow ktrace privileges for root in jail. 3152 */ 3153 case PRIV_KTRACE: 3154 3155 #if 0 3156 /* 3157 * Allow jailed processes to configure audit identity and 3158 * submit audit records (login, etc). In the future we may 3159 * want to further refine the relationship between audit and 3160 * jail. 3161 */ 3162 case PRIV_AUDIT_GETAUDIT: 3163 case PRIV_AUDIT_SETAUDIT: 3164 case PRIV_AUDIT_SUBMIT: 3165 #endif 3166 3167 /* 3168 * Allow jailed processes to manipulate process UNIX 3169 * credentials in any way they see fit. 3170 */ 3171 case PRIV_CRED_SETUID: 3172 case PRIV_CRED_SETEUID: 3173 case PRIV_CRED_SETGID: 3174 case PRIV_CRED_SETEGID: 3175 case PRIV_CRED_SETGROUPS: 3176 case PRIV_CRED_SETREUID: 3177 case PRIV_CRED_SETREGID: 3178 case PRIV_CRED_SETRESUID: 3179 case PRIV_CRED_SETRESGID: 3180 3181 /* 3182 * Jail implements visibility constraints already, so allow 3183 * jailed root to override uid/gid-based constraints. 3184 */ 3185 case PRIV_SEEOTHERGIDS: 3186 case PRIV_SEEOTHERUIDS: 3187 3188 /* 3189 * Jail implements inter-process debugging limits already, so 3190 * allow jailed root various debugging privileges. 3191 */ 3192 case PRIV_DEBUG_DIFFCRED: 3193 case PRIV_DEBUG_SUGID: 3194 case PRIV_DEBUG_UNPRIV: 3195 3196 /* 3197 * Allow jail to set various resource limits and login 3198 * properties, and for now, exceed process resource limits. 3199 */ 3200 case PRIV_PROC_LIMIT: 3201 case PRIV_PROC_SETLOGIN: 3202 case PRIV_PROC_SETRLIMIT: 3203 3204 /* 3205 * System V and POSIX IPC privileges are granted in jail. 3206 */ 3207 case PRIV_IPC_READ: 3208 case PRIV_IPC_WRITE: 3209 case PRIV_IPC_ADMIN: 3210 case PRIV_IPC_MSGSIZE: 3211 case PRIV_MQ_ADMIN: 3212 3213 /* 3214 * Jail operations within a jail work on child jails. 3215 */ 3216 case PRIV_JAIL_ATTACH: 3217 case PRIV_JAIL_SET: 3218 case PRIV_JAIL_REMOVE: 3219 3220 /* 3221 * Jail implements its own inter-process limits, so allow 3222 * root processes in jail to change scheduling on other 3223 * processes in the same jail. Likewise for signalling. 3224 */ 3225 case PRIV_SCHED_DIFFCRED: 3226 case PRIV_SCHED_CPUSET: 3227 case PRIV_SIGNAL_DIFFCRED: 3228 case PRIV_SIGNAL_SUGID: 3229 3230 /* 3231 * Allow jailed processes to write to sysctls marked as jail 3232 * writable. 3233 */ 3234 case PRIV_SYSCTL_WRITEJAIL: 3235 3236 /* 3237 * Allow root in jail to manage a variety of quota 3238 * properties. These should likely be conditional on a 3239 * configuration option. 3240 */ 3241 case PRIV_VFS_GETQUOTA: 3242 case PRIV_VFS_SETQUOTA: 3243 3244 /* 3245 * Since Jail relies on chroot() to implement file system 3246 * protections, grant many VFS privileges to root in jail. 3247 * Be careful to exclude mount-related and NFS-related 3248 * privileges. 3249 */ 3250 case PRIV_VFS_READ: 3251 case PRIV_VFS_WRITE: 3252 case PRIV_VFS_ADMIN: 3253 case PRIV_VFS_EXEC: 3254 case PRIV_VFS_LOOKUP: 3255 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3256 case PRIV_VFS_CHFLAGS_DEV: 3257 case PRIV_VFS_CHOWN: 3258 case PRIV_VFS_CHROOT: 3259 case PRIV_VFS_RETAINSUGID: 3260 case PRIV_VFS_FCHROOT: 3261 case PRIV_VFS_LINK: 3262 case PRIV_VFS_SETGID: 3263 case PRIV_VFS_STAT: 3264 case PRIV_VFS_STICKYFILE: 3265 3266 /* 3267 * As in the non-jail case, non-root users are expected to be 3268 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3269 * exists in the jail and they have permission to access it). 3270 */ 3271 case PRIV_KMEM_READ: 3272 return (0); 3273 3274 /* 3275 * Depending on the global setting, allow privilege of 3276 * setting system flags. 3277 */ 3278 case PRIV_VFS_SYSFLAGS: 3279 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3280 return (0); 3281 else 3282 return (EPERM); 3283 3284 /* 3285 * Depending on the global setting, allow privilege of 3286 * mounting/unmounting file systems. 3287 */ 3288 case PRIV_VFS_MOUNT: 3289 case PRIV_VFS_UNMOUNT: 3290 case PRIV_VFS_MOUNT_NONUSER: 3291 case PRIV_VFS_MOUNT_OWNER: 3292 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3293 cred->cr_prison->pr_enforce_statfs < 2) 3294 return (0); 3295 else 3296 return (EPERM); 3297 3298 /* 3299 * Conditionnaly allow locking (unlocking) physical pages 3300 * in memory. 3301 */ 3302 case PRIV_VM_MLOCK: 3303 case PRIV_VM_MUNLOCK: 3304 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK) 3305 return (0); 3306 else 3307 return (EPERM); 3308 3309 /* 3310 * Conditionally allow jailed root to bind reserved ports. 3311 */ 3312 case PRIV_NETINET_RESERVEDPORT: 3313 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS) 3314 return (0); 3315 else 3316 return (EPERM); 3317 3318 /* 3319 * Allow jailed root to reuse in-use ports. 3320 */ 3321 case PRIV_NETINET_REUSEPORT: 3322 return (0); 3323 3324 /* 3325 * Allow jailed root to set certain IPv4/6 (option) headers. 3326 */ 3327 case PRIV_NETINET_SETHDROPTS: 3328 return (0); 3329 3330 /* 3331 * Conditionally allow creating raw sockets in jail. 3332 */ 3333 case PRIV_NETINET_RAW: 3334 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3335 return (0); 3336 else 3337 return (EPERM); 3338 3339 /* 3340 * Since jail implements its own visibility limits on netstat 3341 * sysctls, allow getcred. This allows identd to work in 3342 * jail. 3343 */ 3344 case PRIV_NETINET_GETCRED: 3345 return (0); 3346 3347 /* 3348 * Allow jailed root to set loginclass. 3349 */ 3350 case PRIV_PROC_SETLOGINCLASS: 3351 return (0); 3352 3353 default: 3354 /* 3355 * In all remaining cases, deny the privilege request. This 3356 * includes almost all network privileges, many system 3357 * configuration privileges. 3358 */ 3359 return (EPERM); 3360 } 3361 } 3362 3363 /* 3364 * Return the part of pr2's name that is relative to pr1, or the whole name 3365 * if it does not directly follow. 3366 */ 3367 3368 char * 3369 prison_name(struct prison *pr1, struct prison *pr2) 3370 { 3371 char *name; 3372 3373 /* Jails see themselves as "0" (if they see themselves at all). */ 3374 if (pr1 == pr2) 3375 return "0"; 3376 name = pr2->pr_name; 3377 if (prison_ischild(pr1, pr2)) { 3378 /* 3379 * pr1 isn't locked (and allprison_lock may not be either) 3380 * so its length can't be counted on. But the number of dots 3381 * can be counted on - and counted. 3382 */ 3383 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3384 name = strchr(name, '.') + 1; 3385 } 3386 return (name); 3387 } 3388 3389 /* 3390 * Return the part of pr2's path that is relative to pr1, or the whole path 3391 * if it does not directly follow. 3392 */ 3393 static char * 3394 prison_path(struct prison *pr1, struct prison *pr2) 3395 { 3396 char *path1, *path2; 3397 int len1; 3398 3399 path1 = pr1->pr_path; 3400 path2 = pr2->pr_path; 3401 if (!strcmp(path1, "/")) 3402 return (path2); 3403 len1 = strlen(path1); 3404 if (strncmp(path1, path2, len1)) 3405 return (path2); 3406 if (path2[len1] == '\0') 3407 return "/"; 3408 if (path2[len1] == '/') 3409 return (path2 + len1); 3410 return (path2); 3411 } 3412 3413 3414 /* 3415 * Jail-related sysctls. 3416 */ 3417 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 3418 "Jails"); 3419 3420 static int 3421 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3422 { 3423 struct xprison *xp; 3424 struct prison *pr, *cpr; 3425 #ifdef INET 3426 struct in_addr *ip4 = NULL; 3427 int ip4s = 0; 3428 #endif 3429 #ifdef INET6 3430 struct in6_addr *ip6 = NULL; 3431 int ip6s = 0; 3432 #endif 3433 int descend, error; 3434 3435 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3436 pr = req->td->td_ucred->cr_prison; 3437 error = 0; 3438 sx_slock(&allprison_lock); 3439 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3440 #if defined(INET) || defined(INET6) 3441 again: 3442 #endif 3443 mtx_lock(&cpr->pr_mtx); 3444 #ifdef INET 3445 if (cpr->pr_ip4s > 0) { 3446 if (ip4s < cpr->pr_ip4s) { 3447 ip4s = cpr->pr_ip4s; 3448 mtx_unlock(&cpr->pr_mtx); 3449 ip4 = realloc(ip4, ip4s * 3450 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3451 goto again; 3452 } 3453 bcopy(cpr->pr_ip4, ip4, 3454 cpr->pr_ip4s * sizeof(struct in_addr)); 3455 } 3456 #endif 3457 #ifdef INET6 3458 if (cpr->pr_ip6s > 0) { 3459 if (ip6s < cpr->pr_ip6s) { 3460 ip6s = cpr->pr_ip6s; 3461 mtx_unlock(&cpr->pr_mtx); 3462 ip6 = realloc(ip6, ip6s * 3463 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 3464 goto again; 3465 } 3466 bcopy(cpr->pr_ip6, ip6, 3467 cpr->pr_ip6s * sizeof(struct in6_addr)); 3468 } 3469 #endif 3470 if (cpr->pr_ref == 0) { 3471 mtx_unlock(&cpr->pr_mtx); 3472 continue; 3473 } 3474 bzero(xp, sizeof(*xp)); 3475 xp->pr_version = XPRISON_VERSION; 3476 xp->pr_id = cpr->pr_id; 3477 xp->pr_state = cpr->pr_uref > 0 3478 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 3479 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 3480 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 3481 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 3482 #ifdef INET 3483 xp->pr_ip4s = cpr->pr_ip4s; 3484 #endif 3485 #ifdef INET6 3486 xp->pr_ip6s = cpr->pr_ip6s; 3487 #endif 3488 mtx_unlock(&cpr->pr_mtx); 3489 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 3490 if (error) 3491 break; 3492 #ifdef INET 3493 if (xp->pr_ip4s > 0) { 3494 error = SYSCTL_OUT(req, ip4, 3495 xp->pr_ip4s * sizeof(struct in_addr)); 3496 if (error) 3497 break; 3498 } 3499 #endif 3500 #ifdef INET6 3501 if (xp->pr_ip6s > 0) { 3502 error = SYSCTL_OUT(req, ip6, 3503 xp->pr_ip6s * sizeof(struct in6_addr)); 3504 if (error) 3505 break; 3506 } 3507 #endif 3508 } 3509 sx_sunlock(&allprison_lock); 3510 free(xp, M_TEMP); 3511 #ifdef INET 3512 free(ip4, M_TEMP); 3513 #endif 3514 #ifdef INET6 3515 free(ip6, M_TEMP); 3516 #endif 3517 return (error); 3518 } 3519 3520 SYSCTL_OID(_security_jail, OID_AUTO, list, 3521 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3522 sysctl_jail_list, "S", "List of active jails"); 3523 3524 static int 3525 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 3526 { 3527 int error, injail; 3528 3529 injail = jailed(req->td->td_ucred); 3530 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 3531 3532 return (error); 3533 } 3534 3535 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 3536 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3537 sysctl_jail_jailed, "I", "Process in jail?"); 3538 3539 static int 3540 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 3541 { 3542 int error, havevnet; 3543 #ifdef VIMAGE 3544 struct ucred *cred = req->td->td_ucred; 3545 3546 havevnet = jailed(cred) && prison_owns_vnet(cred); 3547 #else 3548 havevnet = 0; 3549 #endif 3550 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 3551 3552 return (error); 3553 } 3554 3555 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 3556 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3557 sysctl_jail_vnet, "I", "Jail owns vnet?"); 3558 3559 #if defined(INET) || defined(INET6) 3560 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 3561 &jail_max_af_ips, 0, 3562 "Number of IP addresses a jail may have at most per address family (deprecated)"); 3563 #endif 3564 3565 /* 3566 * Default parameters for jail(2) compatibility. For historical reasons, 3567 * the sysctl names have varying similarity to the parameter names. Prisons 3568 * just see their own parameters, and can't change them. 3569 */ 3570 static int 3571 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 3572 { 3573 struct prison *pr; 3574 int allow, error, i; 3575 3576 pr = req->td->td_ucred->cr_prison; 3577 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 3578 3579 /* Get the current flag value, and convert it to a boolean. */ 3580 i = (allow & arg2) ? 1 : 0; 3581 if (arg1 != NULL) 3582 i = !i; 3583 error = sysctl_handle_int(oidp, &i, 0, req); 3584 if (error || !req->newptr) 3585 return (error); 3586 i = i ? arg2 : 0; 3587 if (arg1 != NULL) 3588 i ^= arg2; 3589 /* 3590 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 3591 * for writing. 3592 */ 3593 mtx_lock(&prison0.pr_mtx); 3594 jail_default_allow = (jail_default_allow & ~arg2) | i; 3595 mtx_unlock(&prison0.pr_mtx); 3596 return (0); 3597 } 3598 3599 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 3600 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3601 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 3602 "Processes in jail can set their hostnames (deprecated)"); 3603 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 3604 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3605 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 3606 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 3607 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 3608 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3609 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 3610 "Processes in jail can use System V IPC primitives (deprecated)"); 3611 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 3612 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3613 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 3614 "Prison root can create raw sockets (deprecated)"); 3615 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 3616 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3617 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 3618 "Processes in jail can alter system file flags (deprecated)"); 3619 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 3620 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3621 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 3622 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 3623 3624 static int 3625 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 3626 { 3627 struct prison *pr; 3628 int level, error; 3629 3630 pr = req->td->td_ucred->cr_prison; 3631 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 3632 error = sysctl_handle_int(oidp, &level, 0, req); 3633 if (error || !req->newptr) 3634 return (error); 3635 *(int *)arg1 = level; 3636 return (0); 3637 } 3638 3639 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 3640 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3641 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 3642 sysctl_jail_default_level, "I", 3643 "Processes in jail cannot see all mounted file systems (deprecated)"); 3644 3645 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 3646 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 3647 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 3648 sysctl_jail_default_level, "I", 3649 "Ruleset for the devfs filesystem in jail (deprecated)"); 3650 3651 /* 3652 * Nodes to describe jail parameters. Maximum length of string parameters 3653 * is returned in the string itself, and the other parameters exist merely 3654 * to make themselves and their types known. 3655 */ 3656 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 3657 "Jail parameters"); 3658 3659 int 3660 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 3661 { 3662 int i; 3663 long l; 3664 size_t s; 3665 char numbuf[12]; 3666 3667 switch (oidp->oid_kind & CTLTYPE) 3668 { 3669 case CTLTYPE_LONG: 3670 case CTLTYPE_ULONG: 3671 l = 0; 3672 #ifdef SCTL_MASK32 3673 if (!(req->flags & SCTL_MASK32)) 3674 #endif 3675 return (SYSCTL_OUT(req, &l, sizeof(l))); 3676 case CTLTYPE_INT: 3677 case CTLTYPE_UINT: 3678 i = 0; 3679 return (SYSCTL_OUT(req, &i, sizeof(i))); 3680 case CTLTYPE_STRING: 3681 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 3682 return 3683 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 3684 case CTLTYPE_STRUCT: 3685 s = (size_t)arg2; 3686 return (SYSCTL_OUT(req, &s, sizeof(s))); 3687 } 3688 return (0); 3689 } 3690 3691 /* 3692 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 3693 * jail creation time but cannot be changed in an existing jail. 3694 */ 3695 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 3696 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 3697 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 3698 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 3699 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 3700 "I", "Jail secure level"); 3701 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 3702 "Jail value for kern.osreldate and uname -K"); 3703 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 3704 "Jail value for kern.osrelease and uname -r"); 3705 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 3706 "I", "Jail cannot see all mounted file systems"); 3707 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 3708 "I", "Ruleset for in-jail devfs mounts"); 3709 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 3710 "B", "Jail persistence"); 3711 #ifdef VIMAGE 3712 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 3713 "E,jailsys", "Virtual network stack"); 3714 #endif 3715 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 3716 "B", "Jail is in the process of shutting down"); 3717 3718 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 3719 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 3720 "I", "Current number of child jails"); 3721 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 3722 "I", "Maximum number of child jails"); 3723 3724 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 3725 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 3726 "Jail hostname"); 3727 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 3728 "Jail NIS domainname"); 3729 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 3730 "Jail host UUID"); 3731 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 3732 "LU", "Jail host ID"); 3733 3734 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 3735 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 3736 3737 #ifdef INET 3738 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 3739 "Jail IPv4 address virtualization"); 3740 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 3741 "S,in_addr,a", "Jail IPv4 addresses"); 3742 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3743 "B", "Do (not) use IPv4 source address selection rather than the " 3744 "primary jail IPv4 address."); 3745 #endif 3746 #ifdef INET6 3747 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 3748 "Jail IPv6 address virtualization"); 3749 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 3750 "S,in6_addr,a", "Jail IPv6 addresses"); 3751 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3752 "B", "Do (not) use IPv6 source address selection rather than the " 3753 "primary jail IPv6 address."); 3754 #endif 3755 3756 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 3757 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 3758 "B", "Jail may set hostname"); 3759 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 3760 "B", "Jail may use SYSV IPC"); 3761 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 3762 "B", "Jail may create raw sockets"); 3763 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 3764 "B", "Jail may alter system file flags"); 3765 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 3766 "B", "Jail may set file quotas"); 3767 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 3768 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 3769 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW, 3770 "B", "Jail may lock (unlock) physical pages in memory"); 3771 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW, 3772 "B", "Jail may bind sockets to reserved ports"); 3773 3774 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 3775 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 3776 "B", "Jail may mount/unmount jail-friendly file systems in general"); 3777 3778 /* 3779 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return 3780 * its associated bit in the pr_allow bitmask, or zero if the parameter was 3781 * not created. 3782 */ 3783 unsigned 3784 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr, 3785 const char *descr) 3786 { 3787 struct bool_flags *bf; 3788 struct sysctl_oid *parent; 3789 char *allow_name, *allow_noname, *allowed; 3790 #ifndef NO_SYSCTL_DESCR 3791 char *descr_deprecated; 3792 #endif 3793 unsigned allow_flag; 3794 3795 if (prefix 3796 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name) 3797 < 0 || 3798 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name) 3799 < 0 3800 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 || 3801 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) { 3802 free(allow_name, M_PRISON); 3803 return 0; 3804 } 3805 3806 /* 3807 * See if this parameter has already beed added, i.e. a module was 3808 * previously loaded/unloaded. 3809 */ 3810 mtx_lock(&prison0.pr_mtx); 3811 for (bf = pr_flag_allow; 3812 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 3813 bf++) { 3814 if (strcmp(bf->name, allow_name) == 0) { 3815 allow_flag = bf->flag; 3816 goto no_add; 3817 } 3818 } 3819 3820 /* 3821 * Find a free bit in prison0's pr_allow, failing if there are none 3822 * (which shouldn't happen as long as we keep track of how many 3823 * potential dynamic flags exist). 3824 */ 3825 for (allow_flag = 1;; allow_flag <<= 1) { 3826 if (allow_flag == 0) 3827 goto no_add; 3828 if ((prison0.pr_allow & allow_flag) == 0) 3829 break; 3830 } 3831 3832 /* 3833 * Note the parameter in the next open slot in pr_flag_allow. 3834 * Set the flag last so code that checks pr_flag_allow can do so 3835 * without locking. 3836 */ 3837 for (bf = pr_flag_allow; bf->flag != 0; bf++) 3838 if (bf == pr_flag_allow + nitems(pr_flag_allow)) { 3839 /* This should never happen, but is not fatal. */ 3840 allow_flag = 0; 3841 goto no_add; 3842 } 3843 prison0.pr_allow |= allow_flag; 3844 bf->name = allow_name; 3845 bf->noname = allow_noname; 3846 bf->flag = allow_flag; 3847 mtx_unlock(&prison0.pr_mtx); 3848 3849 /* 3850 * Create sysctls for the paramter, and the back-compat global 3851 * permission. 3852 */ 3853 parent = prefix 3854 ? SYSCTL_ADD_NODE(NULL, 3855 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow), 3856 OID_AUTO, prefix, 0, 0, prefix_descr) 3857 : &sysctl___security_jail_param_allow; 3858 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO, 3859 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3860 NULL, 0, sysctl_jail_param, "B", descr); 3861 if ((prefix 3862 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name) 3863 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) { 3864 #ifndef NO_SYSCTL_DESCR 3865 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)", 3866 descr); 3867 #endif 3868 (void)SYSCTL_ADD_PROC(NULL, 3869 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed, 3870 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag, 3871 sysctl_jail_default_allow, "I", descr_deprecated); 3872 #ifndef NO_SYSCTL_DESCR 3873 free(descr_deprecated, M_TEMP); 3874 #endif 3875 free(allowed, M_TEMP); 3876 } 3877 return allow_flag; 3878 3879 no_add: 3880 mtx_unlock(&prison0.pr_mtx); 3881 free(allow_name, M_PRISON); 3882 free(allow_noname, M_PRISON); 3883 return allow_flag; 3884 } 3885 3886 /* 3887 * The VFS system will register jail-aware filesystems here. They each get 3888 * a parameter allow.mount.xxxfs and a flag to check when a jailed user 3889 * attempts to mount. 3890 */ 3891 void 3892 prison_add_vfs(struct vfsconf *vfsp) 3893 { 3894 #ifdef NO_SYSCTL_DESCR 3895 3896 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 3897 NULL, NULL); 3898 #else 3899 char *descr; 3900 3901 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system", 3902 vfsp->vfc_name); 3903 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 3904 NULL, descr); 3905 free(descr, M_TEMP); 3906 #endif 3907 } 3908 3909 #ifdef RACCT 3910 void 3911 prison_racct_foreach(void (*callback)(struct racct *racct, 3912 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 3913 void *arg2, void *arg3) 3914 { 3915 struct prison_racct *prr; 3916 3917 ASSERT_RACCT_ENABLED(); 3918 3919 sx_slock(&allprison_lock); 3920 if (pre != NULL) 3921 (pre)(); 3922 LIST_FOREACH(prr, &allprison_racct, prr_next) 3923 (callback)(prr->prr_racct, arg2, arg3); 3924 if (post != NULL) 3925 (post)(); 3926 sx_sunlock(&allprison_lock); 3927 } 3928 3929 static struct prison_racct * 3930 prison_racct_find_locked(const char *name) 3931 { 3932 struct prison_racct *prr; 3933 3934 ASSERT_RACCT_ENABLED(); 3935 sx_assert(&allprison_lock, SA_XLOCKED); 3936 3937 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 3938 return (NULL); 3939 3940 LIST_FOREACH(prr, &allprison_racct, prr_next) { 3941 if (strcmp(name, prr->prr_name) != 0) 3942 continue; 3943 3944 /* Found prison_racct with a matching name? */ 3945 prison_racct_hold(prr); 3946 return (prr); 3947 } 3948 3949 /* Add new prison_racct. */ 3950 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 3951 racct_create(&prr->prr_racct); 3952 3953 strcpy(prr->prr_name, name); 3954 refcount_init(&prr->prr_refcount, 1); 3955 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 3956 3957 return (prr); 3958 } 3959 3960 struct prison_racct * 3961 prison_racct_find(const char *name) 3962 { 3963 struct prison_racct *prr; 3964 3965 ASSERT_RACCT_ENABLED(); 3966 3967 sx_xlock(&allprison_lock); 3968 prr = prison_racct_find_locked(name); 3969 sx_xunlock(&allprison_lock); 3970 return (prr); 3971 } 3972 3973 void 3974 prison_racct_hold(struct prison_racct *prr) 3975 { 3976 3977 ASSERT_RACCT_ENABLED(); 3978 3979 refcount_acquire(&prr->prr_refcount); 3980 } 3981 3982 static void 3983 prison_racct_free_locked(struct prison_racct *prr) 3984 { 3985 3986 ASSERT_RACCT_ENABLED(); 3987 sx_assert(&allprison_lock, SA_XLOCKED); 3988 3989 if (refcount_release(&prr->prr_refcount)) { 3990 racct_destroy(&prr->prr_racct); 3991 LIST_REMOVE(prr, prr_next); 3992 free(prr, M_PRISON_RACCT); 3993 } 3994 } 3995 3996 void 3997 prison_racct_free(struct prison_racct *prr) 3998 { 3999 int old; 4000 4001 ASSERT_RACCT_ENABLED(); 4002 sx_assert(&allprison_lock, SA_UNLOCKED); 4003 4004 old = prr->prr_refcount; 4005 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4006 return; 4007 4008 sx_xlock(&allprison_lock); 4009 prison_racct_free_locked(prr); 4010 sx_xunlock(&allprison_lock); 4011 } 4012 4013 static void 4014 prison_racct_attach(struct prison *pr) 4015 { 4016 struct prison_racct *prr; 4017 4018 ASSERT_RACCT_ENABLED(); 4019 sx_assert(&allprison_lock, SA_XLOCKED); 4020 4021 prr = prison_racct_find_locked(pr->pr_name); 4022 KASSERT(prr != NULL, ("cannot find prison_racct")); 4023 4024 pr->pr_prison_racct = prr; 4025 } 4026 4027 /* 4028 * Handle jail renaming. From the racct point of view, renaming means 4029 * moving from one prison_racct to another. 4030 */ 4031 static void 4032 prison_racct_modify(struct prison *pr) 4033 { 4034 #ifdef RCTL 4035 struct proc *p; 4036 struct ucred *cred; 4037 #endif 4038 struct prison_racct *oldprr; 4039 4040 ASSERT_RACCT_ENABLED(); 4041 4042 sx_slock(&allproc_lock); 4043 sx_xlock(&allprison_lock); 4044 4045 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4046 sx_xunlock(&allprison_lock); 4047 sx_sunlock(&allproc_lock); 4048 return; 4049 } 4050 4051 oldprr = pr->pr_prison_racct; 4052 pr->pr_prison_racct = NULL; 4053 4054 prison_racct_attach(pr); 4055 4056 /* 4057 * Move resource utilisation records. 4058 */ 4059 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4060 4061 #ifdef RCTL 4062 /* 4063 * Force rctl to reattach rules to processes. 4064 */ 4065 FOREACH_PROC_IN_SYSTEM(p) { 4066 PROC_LOCK(p); 4067 cred = crhold(p->p_ucred); 4068 PROC_UNLOCK(p); 4069 rctl_proc_ucred_changed(p, cred); 4070 crfree(cred); 4071 } 4072 #endif 4073 4074 sx_sunlock(&allproc_lock); 4075 prison_racct_free_locked(oldprr); 4076 sx_xunlock(&allprison_lock); 4077 } 4078 4079 static void 4080 prison_racct_detach(struct prison *pr) 4081 { 4082 4083 ASSERT_RACCT_ENABLED(); 4084 sx_assert(&allprison_lock, SA_UNLOCKED); 4085 4086 if (pr->pr_prison_racct == NULL) 4087 return; 4088 prison_racct_free(pr->pr_prison_racct); 4089 pr->pr_prison_racct = NULL; 4090 } 4091 #endif /* RACCT */ 4092 4093 #ifdef DDB 4094 4095 static void 4096 db_show_prison(struct prison *pr) 4097 { 4098 struct bool_flags *bf; 4099 struct jailsys_flags *jsf; 4100 #if defined(INET) || defined(INET6) 4101 int ii; 4102 #endif 4103 unsigned f; 4104 #ifdef INET 4105 char ip4buf[INET_ADDRSTRLEN]; 4106 #endif 4107 #ifdef INET6 4108 char ip6buf[INET6_ADDRSTRLEN]; 4109 #endif 4110 4111 db_printf("prison %p:\n", pr); 4112 db_printf(" jid = %d\n", pr->pr_id); 4113 db_printf(" name = %s\n", pr->pr_name); 4114 db_printf(" parent = %p\n", pr->pr_parent); 4115 db_printf(" ref = %d\n", pr->pr_ref); 4116 db_printf(" uref = %d\n", pr->pr_uref); 4117 db_printf(" path = %s\n", pr->pr_path); 4118 db_printf(" cpuset = %d\n", pr->pr_cpuset 4119 ? pr->pr_cpuset->cs_id : -1); 4120 #ifdef VIMAGE 4121 db_printf(" vnet = %p\n", pr->pr_vnet); 4122 #endif 4123 db_printf(" root = %p\n", pr->pr_root); 4124 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4125 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4126 db_printf(" children.max = %d\n", pr->pr_childmax); 4127 db_printf(" children.cur = %d\n", pr->pr_childcount); 4128 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4129 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4130 db_printf(" flags = 0x%x", pr->pr_flags); 4131 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++) 4132 if (pr->pr_flags & bf->flag) 4133 db_printf(" %s", bf->name); 4134 for (jsf = pr_flag_jailsys; 4135 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 4136 jsf++) { 4137 f = pr->pr_flags & (jsf->disable | jsf->new); 4138 db_printf(" %-16s= %s\n", jsf->name, 4139 (f != 0 && f == jsf->disable) ? "disable" 4140 : (f == jsf->new) ? "new" 4141 : "inherit"); 4142 } 4143 db_printf(" allow = 0x%x", pr->pr_allow); 4144 for (bf = pr_flag_allow; 4145 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 4146 bf++) 4147 if (pr->pr_allow & bf->flag) 4148 db_printf(" %s", bf->name); 4149 db_printf("\n"); 4150 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4151 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4152 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4153 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4154 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4155 #ifdef INET 4156 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4157 for (ii = 0; ii < pr->pr_ip4s; ii++) 4158 db_printf(" %s %s\n", 4159 ii == 0 ? "ip4.addr =" : " ", 4160 inet_ntoa_r(pr->pr_ip4[ii], ip4buf)); 4161 #endif 4162 #ifdef INET6 4163 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4164 for (ii = 0; ii < pr->pr_ip6s; ii++) 4165 db_printf(" %s %s\n", 4166 ii == 0 ? "ip6.addr =" : " ", 4167 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4168 #endif 4169 } 4170 4171 DB_SHOW_COMMAND(prison, db_show_prison_command) 4172 { 4173 struct prison *pr; 4174 4175 if (!have_addr) { 4176 /* 4177 * Show all prisons in the list, and prison0 which is not 4178 * listed. 4179 */ 4180 db_show_prison(&prison0); 4181 if (!db_pager_quit) { 4182 TAILQ_FOREACH(pr, &allprison, pr_list) { 4183 db_show_prison(pr); 4184 if (db_pager_quit) 4185 break; 4186 } 4187 } 4188 return; 4189 } 4190 4191 if (addr == 0) 4192 pr = &prison0; 4193 else { 4194 /* Look for a prison with the ID and with references. */ 4195 TAILQ_FOREACH(pr, &allprison, pr_list) 4196 if (pr->pr_id == addr && pr->pr_ref > 0) 4197 break; 4198 if (pr == NULL) 4199 /* Look again, without requiring a reference. */ 4200 TAILQ_FOREACH(pr, &allprison, pr_list) 4201 if (pr->pr_id == addr) 4202 break; 4203 if (pr == NULL) 4204 /* Assume address points to a valid prison. */ 4205 pr = (struct prison *)addr; 4206 } 4207 db_show_prison(pr); 4208 } 4209 4210 #endif /* DDB */ 4211