1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1999 Poul-Henning Kamp. 5 * Copyright (c) 2008 Bjoern A. Zeeb. 6 * Copyright (c) 2009 James Gritton. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include "opt_ddb.h" 35 #include "opt_inet.h" 36 #include "opt_inet6.h" 37 38 #include <sys/param.h> 39 #include <sys/types.h> 40 #include <sys/kernel.h> 41 #include <sys/systm.h> 42 #include <sys/errno.h> 43 #include <sys/sysproto.h> 44 #include <sys/malloc.h> 45 #include <sys/osd.h> 46 #include <sys/priv.h> 47 #include <sys/proc.h> 48 #include <sys/taskqueue.h> 49 #include <sys/fcntl.h> 50 #include <sys/jail.h> 51 #include <sys/lock.h> 52 #include <sys/mutex.h> 53 #include <sys/racct.h> 54 #include <sys/rctl.h> 55 #include <sys/refcount.h> 56 #include <sys/sx.h> 57 #include <sys/sysent.h> 58 #include <sys/namei.h> 59 #include <sys/mount.h> 60 #include <sys/queue.h> 61 #include <sys/socket.h> 62 #include <sys/syscallsubr.h> 63 #include <sys/sysctl.h> 64 #include <sys/vnode.h> 65 66 #include <net/if.h> 67 #include <net/vnet.h> 68 69 #include <netinet/in.h> 70 71 #ifdef DDB 72 #include <ddb/ddb.h> 73 #endif /* DDB */ 74 75 #include <security/mac/mac_framework.h> 76 77 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 78 79 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 80 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 81 82 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 83 #ifdef INET 84 #ifdef INET6 85 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 86 #else 87 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 88 #endif 89 #else /* !INET */ 90 #ifdef INET6 91 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 92 #else 93 #define _PR_IP_SADDRSEL 0 94 #endif 95 #endif 96 97 /* prison0 describes what is "real" about the system. */ 98 struct prison prison0 = { 99 .pr_id = 0, 100 .pr_name = "0", 101 .pr_ref = 1, 102 .pr_uref = 1, 103 .pr_path = "/", 104 .pr_securelevel = -1, 105 .pr_devfs_rsnum = 0, 106 .pr_childmax = JAIL_MAX, 107 .pr_hostuuid = DEFAULT_HOSTUUID, 108 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 109 #ifdef VIMAGE 110 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 111 #else 112 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 113 #endif 114 .pr_allow = PR_ALLOW_ALL_STATIC, 115 }; 116 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 117 118 struct bool_flags { 119 const char *name; 120 const char *noname; 121 unsigned flag; 122 }; 123 struct jailsys_flags { 124 const char *name; 125 unsigned disable; 126 unsigned new; 127 }; 128 129 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 130 struct sx allprison_lock; 131 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 132 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 133 LIST_HEAD(, prison_racct) allprison_racct; 134 int lastprid = 0; 135 136 static int do_jail_attach(struct thread *td, struct prison *pr); 137 static void prison_complete(void *context, int pending); 138 static void prison_deref(struct prison *pr, int flags); 139 static char *prison_path(struct prison *pr1, struct prison *pr2); 140 static void prison_remove_one(struct prison *pr); 141 #ifdef RACCT 142 static void prison_racct_attach(struct prison *pr); 143 static void prison_racct_modify(struct prison *pr); 144 static void prison_racct_detach(struct prison *pr); 145 #endif 146 147 /* Flags for prison_deref */ 148 #define PD_DEREF 0x01 149 #define PD_DEUREF 0x02 150 #define PD_LOCKED 0x04 151 #define PD_LIST_SLOCKED 0x08 152 #define PD_LIST_XLOCKED 0x10 153 154 /* 155 * Parameter names corresponding to PR_* flag values. Size values are for kvm 156 * as we cannot figure out the size of a sparse array, or an array without a 157 * terminating entry. 158 */ 159 static struct bool_flags pr_flag_bool[] = { 160 {"persist", "nopersist", PR_PERSIST}, 161 #ifdef INET 162 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL}, 163 #endif 164 #ifdef INET6 165 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL}, 166 #endif 167 }; 168 const size_t pr_flag_bool_size = sizeof(pr_flag_bool); 169 170 static struct jailsys_flags pr_flag_jailsys[] = { 171 {"host", 0, PR_HOST}, 172 #ifdef VIMAGE 173 {"vnet", 0, PR_VNET}, 174 #endif 175 #ifdef INET 176 {"ip4", PR_IP4_USER, PR_IP4_USER}, 177 #endif 178 #ifdef INET6 179 {"ip6", PR_IP6_USER, PR_IP6_USER}, 180 #endif 181 }; 182 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 183 184 /* Make this array full-size so dynamic parameters can be added. */ 185 static struct bool_flags pr_flag_allow[NBBY * NBPW] = { 186 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME}, 187 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC}, 188 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS}, 189 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS}, 190 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT}, 191 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS}, 192 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF}, 193 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK}, 194 {"allow.reserved_ports", "allow.noreserved_ports", 195 PR_ALLOW_RESERVED_PORTS}, 196 {"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF}, 197 {"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug", 198 PR_ALLOW_UNPRIV_DEBUG}, 199 }; 200 const size_t pr_flag_allow_size = sizeof(pr_flag_allow); 201 202 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \ 203 PR_ALLOW_RESERVED_PORTS | \ 204 PR_ALLOW_UNPRIV_DEBUG) 205 #define JAIL_DEFAULT_ENFORCE_STATFS 2 206 #define JAIL_DEFAULT_DEVFS_RSNUM 0 207 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 208 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 209 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 210 #if defined(INET) || defined(INET6) 211 static unsigned jail_max_af_ips = 255; 212 #endif 213 214 /* 215 * Initialize the parts of prison0 that can't be static-initialized with 216 * constants. This is called from proc0_init() after creating thread0 cpuset. 217 */ 218 void 219 prison0_init(void) 220 { 221 222 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 223 prison0.pr_osreldate = osreldate; 224 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 225 } 226 227 /* 228 * struct jail_args { 229 * struct jail *jail; 230 * }; 231 */ 232 int 233 sys_jail(struct thread *td, struct jail_args *uap) 234 { 235 uint32_t version; 236 int error; 237 struct jail j; 238 239 error = copyin(uap->jail, &version, sizeof(uint32_t)); 240 if (error) 241 return (error); 242 243 switch (version) { 244 case 0: 245 { 246 struct jail_v0 j0; 247 248 /* FreeBSD single IPv4 jails. */ 249 bzero(&j, sizeof(struct jail)); 250 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 251 if (error) 252 return (error); 253 j.version = j0.version; 254 j.path = j0.path; 255 j.hostname = j0.hostname; 256 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 257 break; 258 } 259 260 case 1: 261 /* 262 * Version 1 was used by multi-IPv4 jail implementations 263 * that never made it into the official kernel. 264 */ 265 return (EINVAL); 266 267 case 2: /* JAIL_API_VERSION */ 268 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 269 error = copyin(uap->jail, &j, sizeof(struct jail)); 270 if (error) 271 return (error); 272 break; 273 274 default: 275 /* Sci-Fi jails are not supported, sorry. */ 276 return (EINVAL); 277 } 278 return (kern_jail(td, &j)); 279 } 280 281 int 282 kern_jail(struct thread *td, struct jail *j) 283 { 284 struct iovec optiov[2 * (4 + nitems(pr_flag_allow) 285 #ifdef INET 286 + 1 287 #endif 288 #ifdef INET6 289 + 1 290 #endif 291 )]; 292 struct uio opt; 293 char *u_path, *u_hostname, *u_name; 294 struct bool_flags *bf; 295 #ifdef INET 296 uint32_t ip4s; 297 struct in_addr *u_ip4; 298 #endif 299 #ifdef INET6 300 struct in6_addr *u_ip6; 301 #endif 302 size_t tmplen; 303 int error, enforce_statfs; 304 305 bzero(&optiov, sizeof(optiov)); 306 opt.uio_iov = optiov; 307 opt.uio_iovcnt = 0; 308 opt.uio_offset = -1; 309 opt.uio_resid = -1; 310 opt.uio_segflg = UIO_SYSSPACE; 311 opt.uio_rw = UIO_READ; 312 opt.uio_td = td; 313 314 /* Set permissions for top-level jails from sysctls. */ 315 if (!jailed(td->td_ucred)) { 316 for (bf = pr_flag_allow; 317 bf < pr_flag_allow + nitems(pr_flag_allow) && 318 bf->flag != 0; 319 bf++) { 320 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *, 321 (jail_default_allow & bf->flag) 322 ? bf->name : bf->noname); 323 optiov[opt.uio_iovcnt].iov_len = 324 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 325 opt.uio_iovcnt += 2; 326 } 327 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 328 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 329 opt.uio_iovcnt++; 330 enforce_statfs = jail_default_enforce_statfs; 331 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 332 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 333 opt.uio_iovcnt++; 334 } 335 336 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 337 #ifdef INET 338 ip4s = (j->version == 0) ? 1 : j->ip4s; 339 if (ip4s > jail_max_af_ips) 340 return (EINVAL); 341 tmplen += ip4s * sizeof(struct in_addr); 342 #else 343 if (j->ip4s > 0) 344 return (EINVAL); 345 #endif 346 #ifdef INET6 347 if (j->ip6s > jail_max_af_ips) 348 return (EINVAL); 349 tmplen += j->ip6s * sizeof(struct in6_addr); 350 #else 351 if (j->ip6s > 0) 352 return (EINVAL); 353 #endif 354 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 355 u_hostname = u_path + MAXPATHLEN; 356 u_name = u_hostname + MAXHOSTNAMELEN; 357 #ifdef INET 358 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 359 #endif 360 #ifdef INET6 361 #ifdef INET 362 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 363 #else 364 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 365 #endif 366 #endif 367 optiov[opt.uio_iovcnt].iov_base = "path"; 368 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 369 opt.uio_iovcnt++; 370 optiov[opt.uio_iovcnt].iov_base = u_path; 371 error = copyinstr(j->path, u_path, MAXPATHLEN, 372 &optiov[opt.uio_iovcnt].iov_len); 373 if (error) { 374 free(u_path, M_TEMP); 375 return (error); 376 } 377 opt.uio_iovcnt++; 378 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 379 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 380 opt.uio_iovcnt++; 381 optiov[opt.uio_iovcnt].iov_base = u_hostname; 382 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 383 &optiov[opt.uio_iovcnt].iov_len); 384 if (error) { 385 free(u_path, M_TEMP); 386 return (error); 387 } 388 opt.uio_iovcnt++; 389 if (j->jailname != NULL) { 390 optiov[opt.uio_iovcnt].iov_base = "name"; 391 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 392 opt.uio_iovcnt++; 393 optiov[opt.uio_iovcnt].iov_base = u_name; 394 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 395 &optiov[opt.uio_iovcnt].iov_len); 396 if (error) { 397 free(u_path, M_TEMP); 398 return (error); 399 } 400 opt.uio_iovcnt++; 401 } 402 #ifdef INET 403 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 404 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 405 opt.uio_iovcnt++; 406 optiov[opt.uio_iovcnt].iov_base = u_ip4; 407 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 408 if (j->version == 0) 409 u_ip4->s_addr = j->ip4s; 410 else { 411 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 412 if (error) { 413 free(u_path, M_TEMP); 414 return (error); 415 } 416 } 417 opt.uio_iovcnt++; 418 #endif 419 #ifdef INET6 420 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 421 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 422 opt.uio_iovcnt++; 423 optiov[opt.uio_iovcnt].iov_base = u_ip6; 424 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 425 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 426 if (error) { 427 free(u_path, M_TEMP); 428 return (error); 429 } 430 opt.uio_iovcnt++; 431 #endif 432 KASSERT(opt.uio_iovcnt <= nitems(optiov), 433 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 434 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 435 free(u_path, M_TEMP); 436 return (error); 437 } 438 439 /* 440 * struct jail_set_args { 441 * struct iovec *iovp; 442 * unsigned int iovcnt; 443 * int flags; 444 * }; 445 */ 446 int 447 sys_jail_set(struct thread *td, struct jail_set_args *uap) 448 { 449 struct uio *auio; 450 int error; 451 452 /* Check that we have an even number of iovecs. */ 453 if (uap->iovcnt & 1) 454 return (EINVAL); 455 456 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 457 if (error) 458 return (error); 459 error = kern_jail_set(td, auio, uap->flags); 460 free(auio, M_IOV); 461 return (error); 462 } 463 464 int 465 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 466 { 467 struct nameidata nd; 468 #ifdef INET 469 struct in_addr *ip4; 470 #endif 471 #ifdef INET6 472 struct in6_addr *ip6; 473 #endif 474 struct vfsopt *opt; 475 struct vfsoptlist *opts; 476 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 477 struct vnode *root; 478 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 479 char *g_path, *osrelstr; 480 struct bool_flags *bf; 481 struct jailsys_flags *jsf; 482 #if defined(INET) || defined(INET6) 483 struct prison *tppr; 484 void *op; 485 #endif 486 unsigned long hid; 487 size_t namelen, onamelen, pnamelen; 488 int born, created, cuflags, descend, enforce; 489 int error, errmsg_len, errmsg_pos; 490 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 491 int jid, jsys, len, level; 492 int childmax, osreldt, rsnum, slevel; 493 int fullpath_disabled; 494 #if defined(INET) || defined(INET6) 495 int ii, ij; 496 #endif 497 #ifdef INET 498 int ip4s, redo_ip4; 499 #endif 500 #ifdef INET6 501 int ip6s, redo_ip6; 502 #endif 503 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 504 uint64_t pr_allow_diff; 505 unsigned tallow; 506 char numbuf[12]; 507 508 error = priv_check(td, PRIV_JAIL_SET); 509 if (!error && (flags & JAIL_ATTACH)) 510 error = priv_check(td, PRIV_JAIL_ATTACH); 511 if (error) 512 return (error); 513 mypr = td->td_ucred->cr_prison; 514 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 515 return (EPERM); 516 if (flags & ~JAIL_SET_MASK) 517 return (EINVAL); 518 519 /* 520 * Check all the parameters before committing to anything. Not all 521 * errors can be caught early, but we may as well try. Also, this 522 * takes care of some expensive stuff (path lookup) before getting 523 * the allprison lock. 524 * 525 * XXX Jails are not filesystems, and jail parameters are not mount 526 * options. But it makes more sense to re-use the vfsopt code 527 * than duplicate it under a different name. 528 */ 529 error = vfs_buildopts(optuio, &opts); 530 if (error) 531 return (error); 532 #ifdef INET 533 ip4 = NULL; 534 #endif 535 #ifdef INET6 536 ip6 = NULL; 537 #endif 538 g_path = NULL; 539 540 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 541 if (!cuflags) { 542 error = EINVAL; 543 vfs_opterror(opts, "no valid operation (create or update)"); 544 goto done_errmsg; 545 } 546 547 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 548 if (error == ENOENT) 549 jid = 0; 550 else if (error != 0) 551 goto done_free; 552 553 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 554 if (error == ENOENT) 555 gotslevel = 0; 556 else if (error != 0) 557 goto done_free; 558 else 559 gotslevel = 1; 560 561 error = 562 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 563 if (error == ENOENT) 564 gotchildmax = 0; 565 else if (error != 0) 566 goto done_free; 567 else 568 gotchildmax = 1; 569 570 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 571 if (error == ENOENT) 572 gotenforce = 0; 573 else if (error != 0) 574 goto done_free; 575 else if (enforce < 0 || enforce > 2) { 576 error = EINVAL; 577 goto done_free; 578 } else 579 gotenforce = 1; 580 581 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 582 if (error == ENOENT) 583 gotrsnum = 0; 584 else if (error != 0) 585 goto done_free; 586 else 587 gotrsnum = 1; 588 589 pr_flags = ch_flags = 0; 590 for (bf = pr_flag_bool; 591 bf < pr_flag_bool + nitems(pr_flag_bool); 592 bf++) { 593 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag); 594 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag); 595 } 596 ch_flags |= pr_flags; 597 for (jsf = pr_flag_jailsys; 598 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 599 jsf++) { 600 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys)); 601 if (error == ENOENT) 602 continue; 603 if (error != 0) 604 goto done_free; 605 switch (jsys) { 606 case JAIL_SYS_DISABLE: 607 if (!jsf->disable) { 608 error = EINVAL; 609 goto done_free; 610 } 611 pr_flags |= jsf->disable; 612 break; 613 case JAIL_SYS_NEW: 614 pr_flags |= jsf->new; 615 break; 616 case JAIL_SYS_INHERIT: 617 break; 618 default: 619 error = EINVAL; 620 goto done_free; 621 } 622 ch_flags |= jsf->new | jsf->disable; 623 } 624 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 625 && !(pr_flags & PR_PERSIST)) { 626 error = EINVAL; 627 vfs_opterror(opts, "new jail must persist or attach"); 628 goto done_errmsg; 629 } 630 #ifdef VIMAGE 631 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 632 error = EINVAL; 633 vfs_opterror(opts, "vnet cannot be changed after creation"); 634 goto done_errmsg; 635 } 636 #endif 637 #ifdef INET 638 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 639 error = EINVAL; 640 vfs_opterror(opts, "ip4 cannot be changed after creation"); 641 goto done_errmsg; 642 } 643 #endif 644 #ifdef INET6 645 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 646 error = EINVAL; 647 vfs_opterror(opts, "ip6 cannot be changed after creation"); 648 goto done_errmsg; 649 } 650 #endif 651 652 pr_allow = ch_allow = 0; 653 for (bf = pr_flag_allow; 654 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 655 bf++) { 656 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag); 657 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag); 658 } 659 ch_allow |= pr_allow; 660 661 error = vfs_getopt(opts, "name", (void **)&name, &len); 662 if (error == ENOENT) 663 name = NULL; 664 else if (error != 0) 665 goto done_free; 666 else { 667 if (len == 0 || name[len - 1] != '\0') { 668 error = EINVAL; 669 goto done_free; 670 } 671 if (len > MAXHOSTNAMELEN) { 672 error = ENAMETOOLONG; 673 goto done_free; 674 } 675 } 676 677 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 678 if (error == ENOENT) 679 host = NULL; 680 else if (error != 0) 681 goto done_free; 682 else { 683 ch_flags |= PR_HOST; 684 pr_flags |= PR_HOST; 685 if (len == 0 || host[len - 1] != '\0') { 686 error = EINVAL; 687 goto done_free; 688 } 689 if (len > MAXHOSTNAMELEN) { 690 error = ENAMETOOLONG; 691 goto done_free; 692 } 693 } 694 695 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 696 if (error == ENOENT) 697 domain = NULL; 698 else if (error != 0) 699 goto done_free; 700 else { 701 ch_flags |= PR_HOST; 702 pr_flags |= PR_HOST; 703 if (len == 0 || domain[len - 1] != '\0') { 704 error = EINVAL; 705 goto done_free; 706 } 707 if (len > MAXHOSTNAMELEN) { 708 error = ENAMETOOLONG; 709 goto done_free; 710 } 711 } 712 713 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 714 if (error == ENOENT) 715 uuid = NULL; 716 else if (error != 0) 717 goto done_free; 718 else { 719 ch_flags |= PR_HOST; 720 pr_flags |= PR_HOST; 721 if (len == 0 || uuid[len - 1] != '\0') { 722 error = EINVAL; 723 goto done_free; 724 } 725 if (len > HOSTUUIDLEN) { 726 error = ENAMETOOLONG; 727 goto done_free; 728 } 729 } 730 731 #ifdef COMPAT_FREEBSD32 732 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 733 uint32_t hid32; 734 735 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 736 hid = hid32; 737 } else 738 #endif 739 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 740 if (error == ENOENT) 741 gothid = 0; 742 else if (error != 0) 743 goto done_free; 744 else { 745 gothid = 1; 746 ch_flags |= PR_HOST; 747 pr_flags |= PR_HOST; 748 } 749 750 #ifdef INET 751 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 752 if (error == ENOENT) 753 ip4s = 0; 754 else if (error != 0) 755 goto done_free; 756 else if (ip4s & (sizeof(*ip4) - 1)) { 757 error = EINVAL; 758 goto done_free; 759 } else { 760 ch_flags |= PR_IP4_USER; 761 pr_flags |= PR_IP4_USER; 762 if (ip4s > 0) { 763 ip4s /= sizeof(*ip4); 764 if (ip4s > jail_max_af_ips) { 765 error = EINVAL; 766 vfs_opterror(opts, "too many IPv4 addresses"); 767 goto done_errmsg; 768 } 769 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 770 bcopy(op, ip4, ip4s * sizeof(*ip4)); 771 /* 772 * IP addresses are all sorted but ip[0] to preserve 773 * the primary IP address as given from userland. 774 * This special IP is used for unbound outgoing 775 * connections as well for "loopback" traffic in case 776 * source address selection cannot find any more fitting 777 * address to connect from. 778 */ 779 if (ip4s > 1) 780 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), 781 prison_qcmp_v4); 782 /* 783 * Check for duplicate addresses and do some simple 784 * zero and broadcast checks. If users give other bogus 785 * addresses it is their problem. 786 * 787 * We do not have to care about byte order for these 788 * checks so we will do them in NBO. 789 */ 790 for (ii = 0; ii < ip4s; ii++) { 791 if (ip4[ii].s_addr == INADDR_ANY || 792 ip4[ii].s_addr == INADDR_BROADCAST) { 793 error = EINVAL; 794 goto done_free; 795 } 796 if ((ii+1) < ip4s && 797 (ip4[0].s_addr == ip4[ii+1].s_addr || 798 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 799 error = EINVAL; 800 goto done_free; 801 } 802 } 803 } 804 } 805 #endif 806 807 #ifdef INET6 808 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 809 if (error == ENOENT) 810 ip6s = 0; 811 else if (error != 0) 812 goto done_free; 813 else if (ip6s & (sizeof(*ip6) - 1)) { 814 error = EINVAL; 815 goto done_free; 816 } else { 817 ch_flags |= PR_IP6_USER; 818 pr_flags |= PR_IP6_USER; 819 if (ip6s > 0) { 820 ip6s /= sizeof(*ip6); 821 if (ip6s > jail_max_af_ips) { 822 error = EINVAL; 823 vfs_opterror(opts, "too many IPv6 addresses"); 824 goto done_errmsg; 825 } 826 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 827 bcopy(op, ip6, ip6s * sizeof(*ip6)); 828 if (ip6s > 1) 829 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), 830 prison_qcmp_v6); 831 for (ii = 0; ii < ip6s; ii++) { 832 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 833 error = EINVAL; 834 goto done_free; 835 } 836 if ((ii+1) < ip6s && 837 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 838 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 839 { 840 error = EINVAL; 841 goto done_free; 842 } 843 } 844 } 845 } 846 #endif 847 848 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 849 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 850 error = EINVAL; 851 vfs_opterror(opts, 852 "vnet jails cannot have IP address restrictions"); 853 goto done_errmsg; 854 } 855 #endif 856 857 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 858 if (error == ENOENT) 859 osrelstr = NULL; 860 else if (error != 0) 861 goto done_free; 862 else { 863 if (flags & JAIL_UPDATE) { 864 error = EINVAL; 865 vfs_opterror(opts, 866 "osrelease cannot be changed after creation"); 867 goto done_errmsg; 868 } 869 if (len == 0 || len >= OSRELEASELEN) { 870 error = EINVAL; 871 vfs_opterror(opts, 872 "osrelease string must be 1-%d bytes long", 873 OSRELEASELEN - 1); 874 goto done_errmsg; 875 } 876 } 877 878 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 879 if (error == ENOENT) 880 osreldt = 0; 881 else if (error != 0) 882 goto done_free; 883 else { 884 if (flags & JAIL_UPDATE) { 885 error = EINVAL; 886 vfs_opterror(opts, 887 "osreldate cannot be changed after creation"); 888 goto done_errmsg; 889 } 890 if (osreldt == 0) { 891 error = EINVAL; 892 vfs_opterror(opts, "osreldate cannot be 0"); 893 goto done_errmsg; 894 } 895 } 896 897 fullpath_disabled = 0; 898 root = NULL; 899 error = vfs_getopt(opts, "path", (void **)&path, &len); 900 if (error == ENOENT) 901 path = NULL; 902 else if (error != 0) 903 goto done_free; 904 else { 905 if (flags & JAIL_UPDATE) { 906 error = EINVAL; 907 vfs_opterror(opts, 908 "path cannot be changed after creation"); 909 goto done_errmsg; 910 } 911 if (len == 0 || path[len - 1] != '\0') { 912 error = EINVAL; 913 goto done_free; 914 } 915 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 916 path, td); 917 error = namei(&nd); 918 if (error) 919 goto done_free; 920 root = nd.ni_vp; 921 NDFREE(&nd, NDF_ONLY_PNBUF); 922 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 923 strlcpy(g_path, path, MAXPATHLEN); 924 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 925 if (error == 0) 926 path = g_path; 927 else if (error == ENODEV) { 928 /* proceed if sysctl debug.disablefullpath == 1 */ 929 fullpath_disabled = 1; 930 if (len < 2 || (len == 2 && path[0] == '/')) 931 path = NULL; 932 } else { 933 /* exit on other errors */ 934 goto done_free; 935 } 936 if (root->v_type != VDIR) { 937 error = ENOTDIR; 938 vput(root); 939 goto done_free; 940 } 941 VOP_UNLOCK(root); 942 if (fullpath_disabled) { 943 /* Leave room for a real-root full pathname. */ 944 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 945 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 946 error = ENAMETOOLONG; 947 vrele(root); 948 goto done_free; 949 } 950 } 951 } 952 953 /* 954 * Find the specified jail, or at least its parent. 955 * This abuses the file error codes ENOENT and EEXIST. 956 */ 957 pr = NULL; 958 ppr = mypr; 959 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 960 namelc = strrchr(name, '.'); 961 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 962 if (*p != '\0') 963 jid = 0; 964 } 965 sx_xlock(&allprison_lock); 966 if (jid != 0) { 967 /* 968 * See if a requested jid already exists. There is an 969 * information leak here if the jid exists but is not within 970 * the caller's jail hierarchy. Jail creators will get EEXIST 971 * even though they cannot see the jail, and CREATE | UPDATE 972 * will return ENOENT which is not normally a valid error. 973 */ 974 if (jid < 0) { 975 error = EINVAL; 976 vfs_opterror(opts, "negative jid"); 977 goto done_unlock_list; 978 } 979 pr = prison_find(jid); 980 if (pr != NULL) { 981 ppr = pr->pr_parent; 982 /* Create: jid must not exist. */ 983 if (cuflags == JAIL_CREATE) { 984 mtx_unlock(&pr->pr_mtx); 985 error = EEXIST; 986 vfs_opterror(opts, "jail %d already exists", 987 jid); 988 goto done_unlock_list; 989 } 990 if (!prison_ischild(mypr, pr)) { 991 mtx_unlock(&pr->pr_mtx); 992 pr = NULL; 993 } else if (pr->pr_uref == 0) { 994 if (!(flags & JAIL_DYING)) { 995 mtx_unlock(&pr->pr_mtx); 996 error = ENOENT; 997 vfs_opterror(opts, "jail %d is dying", 998 jid); 999 goto done_unlock_list; 1000 } else if ((flags & JAIL_ATTACH) || 1001 (pr_flags & PR_PERSIST)) { 1002 /* 1003 * A dying jail might be resurrected 1004 * (via attach or persist), but first 1005 * it must determine if another jail 1006 * has claimed its name. Accomplish 1007 * this by implicitly re-setting the 1008 * name. 1009 */ 1010 if (name == NULL) 1011 name = prison_name(mypr, pr); 1012 } 1013 } 1014 } 1015 if (pr == NULL) { 1016 /* Update: jid must exist. */ 1017 if (cuflags == JAIL_UPDATE) { 1018 error = ENOENT; 1019 vfs_opterror(opts, "jail %d not found", jid); 1020 goto done_unlock_list; 1021 } 1022 } 1023 } 1024 /* 1025 * If the caller provided a name, look for a jail by that name. 1026 * This has different semantics for creates and updates keyed by jid 1027 * (where the name must not already exist in a different jail), 1028 * and updates keyed by the name itself (where the name must exist 1029 * because that is the jail being updated). 1030 */ 1031 namelc = NULL; 1032 if (name != NULL) { 1033 namelc = strrchr(name, '.'); 1034 if (namelc == NULL) 1035 namelc = name; 1036 else { 1037 /* 1038 * This is a hierarchical name. Split it into the 1039 * parent and child names, and make sure the parent 1040 * exists or matches an already found jail. 1041 */ 1042 if (pr != NULL) { 1043 if (strncmp(name, ppr->pr_name, namelc - name) 1044 || ppr->pr_name[namelc - name] != '\0') { 1045 mtx_unlock(&pr->pr_mtx); 1046 error = EINVAL; 1047 vfs_opterror(opts, 1048 "cannot change jail's parent"); 1049 goto done_unlock_list; 1050 } 1051 } else { 1052 *namelc = '\0'; 1053 ppr = prison_find_name(mypr, name); 1054 if (ppr == NULL) { 1055 error = ENOENT; 1056 vfs_opterror(opts, 1057 "jail \"%s\" not found", name); 1058 goto done_unlock_list; 1059 } 1060 mtx_unlock(&ppr->pr_mtx); 1061 *namelc = '.'; 1062 } 1063 namelc++; 1064 } 1065 if (namelc[0] != '\0') { 1066 pnamelen = 1067 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1068 name_again: 1069 deadpr = NULL; 1070 FOREACH_PRISON_CHILD(ppr, tpr) { 1071 if (tpr != pr && tpr->pr_ref > 0 && 1072 !strcmp(tpr->pr_name + pnamelen, namelc)) { 1073 if (pr == NULL && 1074 cuflags != JAIL_CREATE) { 1075 mtx_lock(&tpr->pr_mtx); 1076 if (tpr->pr_ref > 0) { 1077 /* 1078 * Use this jail 1079 * for updates. 1080 */ 1081 if (tpr->pr_uref > 0) { 1082 pr = tpr; 1083 break; 1084 } 1085 deadpr = tpr; 1086 } 1087 mtx_unlock(&tpr->pr_mtx); 1088 } else if (tpr->pr_uref > 0) { 1089 /* 1090 * Create, or update(jid): 1091 * name must not exist in an 1092 * active sibling jail. 1093 */ 1094 error = EEXIST; 1095 if (pr != NULL) 1096 mtx_unlock(&pr->pr_mtx); 1097 vfs_opterror(opts, 1098 "jail \"%s\" already exists", 1099 name); 1100 goto done_unlock_list; 1101 } 1102 } 1103 } 1104 /* If no active jail is found, use a dying one. */ 1105 if (deadpr != NULL && pr == NULL) { 1106 if (flags & JAIL_DYING) { 1107 mtx_lock(&deadpr->pr_mtx); 1108 if (deadpr->pr_ref == 0) { 1109 mtx_unlock(&deadpr->pr_mtx); 1110 goto name_again; 1111 } 1112 pr = deadpr; 1113 } else if (cuflags == JAIL_UPDATE) { 1114 error = ENOENT; 1115 vfs_opterror(opts, 1116 "jail \"%s\" is dying", name); 1117 goto done_unlock_list; 1118 } 1119 } 1120 /* Update: name must exist if no jid. */ 1121 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1122 error = ENOENT; 1123 vfs_opterror(opts, "jail \"%s\" not found", 1124 name); 1125 goto done_unlock_list; 1126 } 1127 } 1128 } 1129 /* Update: must provide a jid or name. */ 1130 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1131 error = ENOENT; 1132 vfs_opterror(opts, "update specified no jail"); 1133 goto done_unlock_list; 1134 } 1135 1136 /* If there's no prison to update, create a new one and link it in. */ 1137 if (pr == NULL) { 1138 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1139 if (tpr->pr_childcount >= tpr->pr_childmax) { 1140 error = EPERM; 1141 vfs_opterror(opts, "prison limit exceeded"); 1142 goto done_unlock_list; 1143 } 1144 created = 1; 1145 mtx_lock(&ppr->pr_mtx); 1146 if (ppr->pr_ref == 0) { 1147 mtx_unlock(&ppr->pr_mtx); 1148 error = ENOENT; 1149 vfs_opterror(opts, "jail \"%s\" not found", 1150 prison_name(mypr, ppr)); 1151 goto done_unlock_list; 1152 } 1153 ppr->pr_ref++; 1154 ppr->pr_uref++; 1155 mtx_unlock(&ppr->pr_mtx); 1156 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1157 if (jid == 0) { 1158 /* Find the next free jid. */ 1159 jid = lastprid + 1; 1160 findnext: 1161 if (jid == JAIL_MAX) 1162 jid = 1; 1163 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1164 if (tpr->pr_id < jid) 1165 continue; 1166 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1167 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1168 break; 1169 } 1170 if (jid == lastprid) { 1171 error = EAGAIN; 1172 vfs_opterror(opts, 1173 "no available jail IDs"); 1174 free(pr, M_PRISON); 1175 prison_deref(ppr, PD_DEREF | 1176 PD_DEUREF | PD_LIST_XLOCKED); 1177 goto done_releroot; 1178 } 1179 jid++; 1180 goto findnext; 1181 } 1182 lastprid = jid; 1183 } else { 1184 /* 1185 * The jail already has a jid (that did not yet exist), 1186 * so just find where to insert it. 1187 */ 1188 TAILQ_FOREACH(tpr, &allprison, pr_list) 1189 if (tpr->pr_id >= jid) { 1190 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1191 break; 1192 } 1193 } 1194 if (tpr == NULL) 1195 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1196 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1197 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1198 tpr->pr_childcount++; 1199 1200 pr->pr_parent = ppr; 1201 pr->pr_id = jid; 1202 1203 /* Set some default values, and inherit some from the parent. */ 1204 if (namelc == NULL) 1205 namelc = ""; 1206 if (path == NULL) { 1207 path = "/"; 1208 root = mypr->pr_root; 1209 vref(root); 1210 } 1211 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1212 pr->pr_flags |= PR_HOST; 1213 #if defined(INET) || defined(INET6) 1214 #ifdef VIMAGE 1215 if (!(pr_flags & PR_VNET)) 1216 #endif 1217 { 1218 #ifdef INET 1219 if (!(ch_flags & PR_IP4_USER)) 1220 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1221 else if (!(pr_flags & PR_IP4_USER)) { 1222 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1223 if (ppr->pr_ip4 != NULL) { 1224 pr->pr_ip4s = ppr->pr_ip4s; 1225 pr->pr_ip4 = malloc(pr->pr_ip4s * 1226 sizeof(struct in_addr), M_PRISON, 1227 M_WAITOK); 1228 bcopy(ppr->pr_ip4, pr->pr_ip4, 1229 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1230 } 1231 } 1232 #endif 1233 #ifdef INET6 1234 if (!(ch_flags & PR_IP6_USER)) 1235 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1236 else if (!(pr_flags & PR_IP6_USER)) { 1237 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1238 if (ppr->pr_ip6 != NULL) { 1239 pr->pr_ip6s = ppr->pr_ip6s; 1240 pr->pr_ip6 = malloc(pr->pr_ip6s * 1241 sizeof(struct in6_addr), M_PRISON, 1242 M_WAITOK); 1243 bcopy(ppr->pr_ip6, pr->pr_ip6, 1244 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1245 } 1246 } 1247 #endif 1248 } 1249 #endif 1250 /* Source address selection is always on by default. */ 1251 pr->pr_flags |= _PR_IP_SADDRSEL; 1252 1253 pr->pr_securelevel = ppr->pr_securelevel; 1254 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1255 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1256 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1257 1258 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1259 if (osrelstr == NULL) 1260 strcpy(pr->pr_osrelease, ppr->pr_osrelease); 1261 else 1262 strcpy(pr->pr_osrelease, osrelstr); 1263 1264 LIST_INIT(&pr->pr_children); 1265 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1266 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1267 1268 #ifdef VIMAGE 1269 /* Allocate a new vnet if specified. */ 1270 pr->pr_vnet = (pr_flags & PR_VNET) 1271 ? vnet_alloc() : ppr->pr_vnet; 1272 #endif 1273 /* 1274 * Allocate a dedicated cpuset for each jail. 1275 * Unlike other initial settings, this may return an erorr. 1276 */ 1277 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1278 if (error) { 1279 prison_deref(pr, PD_LIST_XLOCKED); 1280 goto done_releroot; 1281 } 1282 1283 mtx_lock(&pr->pr_mtx); 1284 /* 1285 * New prisons do not yet have a reference, because we do not 1286 * want others to see the incomplete prison once the 1287 * allprison_lock is downgraded. 1288 */ 1289 } else { 1290 created = 0; 1291 /* 1292 * Grab a reference for existing prisons, to ensure they 1293 * continue to exist for the duration of the call. 1294 */ 1295 pr->pr_ref++; 1296 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1297 if ((pr->pr_flags & PR_VNET) && 1298 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1299 error = EINVAL; 1300 vfs_opterror(opts, 1301 "vnet jails cannot have IP address restrictions"); 1302 goto done_deref_locked; 1303 } 1304 #endif 1305 #ifdef INET 1306 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1307 error = EINVAL; 1308 vfs_opterror(opts, 1309 "ip4 cannot be changed after creation"); 1310 goto done_deref_locked; 1311 } 1312 #endif 1313 #ifdef INET6 1314 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1315 error = EINVAL; 1316 vfs_opterror(opts, 1317 "ip6 cannot be changed after creation"); 1318 goto done_deref_locked; 1319 } 1320 #endif 1321 } 1322 1323 /* Do final error checking before setting anything. */ 1324 if (gotslevel) { 1325 if (slevel < ppr->pr_securelevel) { 1326 error = EPERM; 1327 goto done_deref_locked; 1328 } 1329 } 1330 if (gotchildmax) { 1331 if (childmax >= ppr->pr_childmax) { 1332 error = EPERM; 1333 goto done_deref_locked; 1334 } 1335 } 1336 if (gotenforce) { 1337 if (enforce < ppr->pr_enforce_statfs) { 1338 error = EPERM; 1339 goto done_deref_locked; 1340 } 1341 } 1342 if (gotrsnum) { 1343 /* 1344 * devfs_rsnum is a uint16_t 1345 */ 1346 if (rsnum < 0 || rsnum > 65535) { 1347 error = EINVAL; 1348 goto done_deref_locked; 1349 } 1350 /* 1351 * Nested jails always inherit parent's devfs ruleset 1352 */ 1353 if (jailed(td->td_ucred)) { 1354 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1355 error = EPERM; 1356 goto done_deref_locked; 1357 } else 1358 rsnum = ppr->pr_devfs_rsnum; 1359 } 1360 } 1361 #ifdef INET 1362 if (ip4s > 0) { 1363 if (ppr->pr_flags & PR_IP4) { 1364 /* 1365 * Make sure the new set of IP addresses is a 1366 * subset of the parent's list. Don't worry 1367 * about the parent being unlocked, as any 1368 * setting is done with allprison_lock held. 1369 */ 1370 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1371 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1372 break; 1373 if (ij == ppr->pr_ip4s) { 1374 error = EPERM; 1375 goto done_deref_locked; 1376 } 1377 if (ip4s > 1) { 1378 for (ii = ij = 1; ii < ip4s; ii++) { 1379 if (ip4[ii].s_addr == 1380 ppr->pr_ip4[0].s_addr) 1381 continue; 1382 for (; ij < ppr->pr_ip4s; ij++) 1383 if (ip4[ii].s_addr == 1384 ppr->pr_ip4[ij].s_addr) 1385 break; 1386 if (ij == ppr->pr_ip4s) 1387 break; 1388 } 1389 if (ij == ppr->pr_ip4s) { 1390 error = EPERM; 1391 goto done_deref_locked; 1392 } 1393 } 1394 } 1395 /* 1396 * Check for conflicting IP addresses. We permit them 1397 * if there is no more than one IP on each jail. If 1398 * there is a duplicate on a jail with more than one 1399 * IP stop checking and return error. 1400 */ 1401 #ifdef VIMAGE 1402 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1403 if (tppr->pr_flags & PR_VNET) 1404 break; 1405 #else 1406 tppr = &prison0; 1407 #endif 1408 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1409 if (tpr == pr || 1410 #ifdef VIMAGE 1411 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1412 #endif 1413 tpr->pr_uref == 0) { 1414 descend = 0; 1415 continue; 1416 } 1417 if (!(tpr->pr_flags & PR_IP4_USER)) 1418 continue; 1419 descend = 0; 1420 if (tpr->pr_ip4 == NULL || 1421 (ip4s == 1 && tpr->pr_ip4s == 1)) 1422 continue; 1423 for (ii = 0; ii < ip4s; ii++) { 1424 if (prison_check_ip4_locked(tpr, &ip4[ii]) == 1425 0) { 1426 error = EADDRINUSE; 1427 vfs_opterror(opts, 1428 "IPv4 addresses clash"); 1429 goto done_deref_locked; 1430 } 1431 } 1432 } 1433 } 1434 #endif 1435 #ifdef INET6 1436 if (ip6s > 0) { 1437 if (ppr->pr_flags & PR_IP6) { 1438 /* 1439 * Make sure the new set of IP addresses is a 1440 * subset of the parent's list. 1441 */ 1442 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1443 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1444 &ppr->pr_ip6[ij])) 1445 break; 1446 if (ij == ppr->pr_ip6s) { 1447 error = EPERM; 1448 goto done_deref_locked; 1449 } 1450 if (ip6s > 1) { 1451 for (ii = ij = 1; ii < ip6s; ii++) { 1452 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1453 &ppr->pr_ip6[0])) 1454 continue; 1455 for (; ij < ppr->pr_ip6s; ij++) 1456 if (IN6_ARE_ADDR_EQUAL( 1457 &ip6[ii], &ppr->pr_ip6[ij])) 1458 break; 1459 if (ij == ppr->pr_ip6s) 1460 break; 1461 } 1462 if (ij == ppr->pr_ip6s) { 1463 error = EPERM; 1464 goto done_deref_locked; 1465 } 1466 } 1467 } 1468 /* Check for conflicting IP addresses. */ 1469 #ifdef VIMAGE 1470 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1471 if (tppr->pr_flags & PR_VNET) 1472 break; 1473 #else 1474 tppr = &prison0; 1475 #endif 1476 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1477 if (tpr == pr || 1478 #ifdef VIMAGE 1479 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1480 #endif 1481 tpr->pr_uref == 0) { 1482 descend = 0; 1483 continue; 1484 } 1485 if (!(tpr->pr_flags & PR_IP6_USER)) 1486 continue; 1487 descend = 0; 1488 if (tpr->pr_ip6 == NULL || 1489 (ip6s == 1 && tpr->pr_ip6s == 1)) 1490 continue; 1491 for (ii = 0; ii < ip6s; ii++) { 1492 if (prison_check_ip6_locked(tpr, &ip6[ii]) == 1493 0) { 1494 error = EADDRINUSE; 1495 vfs_opterror(opts, 1496 "IPv6 addresses clash"); 1497 goto done_deref_locked; 1498 } 1499 } 1500 } 1501 } 1502 #endif 1503 onamelen = namelen = 0; 1504 if (namelc != NULL) { 1505 /* Give a default name of the jid. Also allow the name to be 1506 * explicitly the jid - but not any other number, and only in 1507 * normal form (no leading zero/etc). 1508 */ 1509 if (namelc[0] == '\0') 1510 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1511 else if ((strtoul(namelc, &p, 10) != jid || 1512 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1513 error = EINVAL; 1514 vfs_opterror(opts, 1515 "name cannot be numeric (unless it is the jid)"); 1516 goto done_deref_locked; 1517 } 1518 /* 1519 * Make sure the name isn't too long for the prison or its 1520 * children. 1521 */ 1522 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1523 onamelen = strlen(pr->pr_name + pnamelen); 1524 namelen = strlen(namelc); 1525 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1526 error = ENAMETOOLONG; 1527 goto done_deref_locked; 1528 } 1529 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1530 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1531 sizeof(pr->pr_name)) { 1532 error = ENAMETOOLONG; 1533 goto done_deref_locked; 1534 } 1535 } 1536 } 1537 pr_allow_diff = pr_allow & ~ppr->pr_allow; 1538 if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) { 1539 error = EPERM; 1540 goto done_deref_locked; 1541 } 1542 1543 /* 1544 * Let modules check their parameters. This requires unlocking and 1545 * then re-locking the prison, but this is still a valid state as long 1546 * as allprison_lock remains xlocked. 1547 */ 1548 mtx_unlock(&pr->pr_mtx); 1549 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1550 if (error != 0) { 1551 prison_deref(pr, created 1552 ? PD_LIST_XLOCKED 1553 : PD_DEREF | PD_LIST_XLOCKED); 1554 goto done_releroot; 1555 } 1556 mtx_lock(&pr->pr_mtx); 1557 1558 /* At this point, all valid parameters should have been noted. */ 1559 TAILQ_FOREACH(opt, opts, link) { 1560 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1561 error = EINVAL; 1562 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1563 goto done_deref_locked; 1564 } 1565 } 1566 1567 /* Set the parameters of the prison. */ 1568 #ifdef INET 1569 redo_ip4 = 0; 1570 if (pr_flags & PR_IP4_USER) { 1571 pr->pr_flags |= PR_IP4; 1572 free(pr->pr_ip4, M_PRISON); 1573 pr->pr_ip4s = ip4s; 1574 pr->pr_ip4 = ip4; 1575 ip4 = NULL; 1576 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1577 #ifdef VIMAGE 1578 if (tpr->pr_flags & PR_VNET) { 1579 descend = 0; 1580 continue; 1581 } 1582 #endif 1583 if (prison_restrict_ip4(tpr, NULL)) { 1584 redo_ip4 = 1; 1585 descend = 0; 1586 } 1587 } 1588 } 1589 #endif 1590 #ifdef INET6 1591 redo_ip6 = 0; 1592 if (pr_flags & PR_IP6_USER) { 1593 pr->pr_flags |= PR_IP6; 1594 free(pr->pr_ip6, M_PRISON); 1595 pr->pr_ip6s = ip6s; 1596 pr->pr_ip6 = ip6; 1597 ip6 = NULL; 1598 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1599 #ifdef VIMAGE 1600 if (tpr->pr_flags & PR_VNET) { 1601 descend = 0; 1602 continue; 1603 } 1604 #endif 1605 if (prison_restrict_ip6(tpr, NULL)) { 1606 redo_ip6 = 1; 1607 descend = 0; 1608 } 1609 } 1610 } 1611 #endif 1612 if (gotslevel) { 1613 pr->pr_securelevel = slevel; 1614 /* Set all child jails to be at least this level. */ 1615 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1616 if (tpr->pr_securelevel < slevel) 1617 tpr->pr_securelevel = slevel; 1618 } 1619 if (gotchildmax) { 1620 pr->pr_childmax = childmax; 1621 /* Set all child jails to under this limit. */ 1622 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1623 if (tpr->pr_childmax > childmax - level) 1624 tpr->pr_childmax = childmax > level 1625 ? childmax - level : 0; 1626 } 1627 if (gotenforce) { 1628 pr->pr_enforce_statfs = enforce; 1629 /* Pass this restriction on to the children. */ 1630 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1631 if (tpr->pr_enforce_statfs < enforce) 1632 tpr->pr_enforce_statfs = enforce; 1633 } 1634 if (gotrsnum) { 1635 pr->pr_devfs_rsnum = rsnum; 1636 /* Pass this restriction on to the children. */ 1637 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1638 tpr->pr_devfs_rsnum = rsnum; 1639 } 1640 if (namelc != NULL) { 1641 if (ppr == &prison0) 1642 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1643 else 1644 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1645 ppr->pr_name, namelc); 1646 /* Change this component of child names. */ 1647 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1648 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1649 strlen(tpr->pr_name + onamelen) + 1); 1650 bcopy(pr->pr_name, tpr->pr_name, namelen); 1651 } 1652 } 1653 if (path != NULL) { 1654 /* Try to keep a real-rooted full pathname. */ 1655 if (fullpath_disabled && path[0] == '/' && 1656 strcmp(mypr->pr_path, "/")) 1657 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1658 mypr->pr_path, path); 1659 else 1660 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1661 pr->pr_root = root; 1662 } 1663 if (PR_HOST & ch_flags & ~pr_flags) { 1664 if (pr->pr_flags & PR_HOST) { 1665 /* 1666 * Copy the parent's host info. As with pr_ip4 above, 1667 * the lack of a lock on the parent is not a problem; 1668 * it is always set with allprison_lock at least 1669 * shared, and is held exclusively here. 1670 */ 1671 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1672 sizeof(pr->pr_hostname)); 1673 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1674 sizeof(pr->pr_domainname)); 1675 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1676 sizeof(pr->pr_hostuuid)); 1677 pr->pr_hostid = pr->pr_parent->pr_hostid; 1678 } 1679 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1680 /* Set this prison, and any descendants without PR_HOST. */ 1681 if (host != NULL) 1682 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1683 if (domain != NULL) 1684 strlcpy(pr->pr_domainname, domain, 1685 sizeof(pr->pr_domainname)); 1686 if (uuid != NULL) 1687 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1688 if (gothid) 1689 pr->pr_hostid = hid; 1690 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1691 if (tpr->pr_flags & PR_HOST) 1692 descend = 0; 1693 else { 1694 if (host != NULL) 1695 strlcpy(tpr->pr_hostname, 1696 pr->pr_hostname, 1697 sizeof(tpr->pr_hostname)); 1698 if (domain != NULL) 1699 strlcpy(tpr->pr_domainname, 1700 pr->pr_domainname, 1701 sizeof(tpr->pr_domainname)); 1702 if (uuid != NULL) 1703 strlcpy(tpr->pr_hostuuid, 1704 pr->pr_hostuuid, 1705 sizeof(tpr->pr_hostuuid)); 1706 if (gothid) 1707 tpr->pr_hostid = hid; 1708 } 1709 } 1710 } 1711 if ((tallow = ch_allow & ~pr_allow)) { 1712 /* Clear allow bits in all children. */ 1713 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1714 tpr->pr_allow &= ~tallow; 1715 } 1716 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1717 /* 1718 * Persistent prisons get an extra reference, and prisons losing their 1719 * persist flag lose that reference. Only do this for existing prisons 1720 * for now, so new ones will remain unseen until after the module 1721 * handlers have completed. 1722 */ 1723 born = pr->pr_uref == 0; 1724 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1725 if (pr_flags & PR_PERSIST) { 1726 pr->pr_ref++; 1727 pr->pr_uref++; 1728 } else { 1729 pr->pr_ref--; 1730 pr->pr_uref--; 1731 } 1732 } 1733 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1734 mtx_unlock(&pr->pr_mtx); 1735 1736 #ifdef RACCT 1737 if (racct_enable && created) 1738 prison_racct_attach(pr); 1739 #endif 1740 1741 /* Locks may have prevented a complete restriction of child IP 1742 * addresses. If so, allocate some more memory and try again. 1743 */ 1744 #ifdef INET 1745 while (redo_ip4) { 1746 ip4s = pr->pr_ip4s; 1747 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1748 mtx_lock(&pr->pr_mtx); 1749 redo_ip4 = 0; 1750 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1751 #ifdef VIMAGE 1752 if (tpr->pr_flags & PR_VNET) { 1753 descend = 0; 1754 continue; 1755 } 1756 #endif 1757 if (prison_restrict_ip4(tpr, ip4)) { 1758 if (ip4 != NULL) 1759 ip4 = NULL; 1760 else 1761 redo_ip4 = 1; 1762 } 1763 } 1764 mtx_unlock(&pr->pr_mtx); 1765 } 1766 #endif 1767 #ifdef INET6 1768 while (redo_ip6) { 1769 ip6s = pr->pr_ip6s; 1770 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1771 mtx_lock(&pr->pr_mtx); 1772 redo_ip6 = 0; 1773 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1774 #ifdef VIMAGE 1775 if (tpr->pr_flags & PR_VNET) { 1776 descend = 0; 1777 continue; 1778 } 1779 #endif 1780 if (prison_restrict_ip6(tpr, ip6)) { 1781 if (ip6 != NULL) 1782 ip6 = NULL; 1783 else 1784 redo_ip6 = 1; 1785 } 1786 } 1787 mtx_unlock(&pr->pr_mtx); 1788 } 1789 #endif 1790 1791 /* Let the modules do their work. */ 1792 sx_downgrade(&allprison_lock); 1793 if (born) { 1794 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1795 if (error) { 1796 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1797 prison_deref(pr, created 1798 ? PD_LIST_SLOCKED 1799 : PD_DEREF | PD_LIST_SLOCKED); 1800 goto done_errmsg; 1801 } 1802 } 1803 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1804 if (error) { 1805 if (born) 1806 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1807 prison_deref(pr, created 1808 ? PD_LIST_SLOCKED 1809 : PD_DEREF | PD_LIST_SLOCKED); 1810 goto done_errmsg; 1811 } 1812 1813 /* Attach this process to the prison if requested. */ 1814 if (flags & JAIL_ATTACH) { 1815 mtx_lock(&pr->pr_mtx); 1816 error = do_jail_attach(td, pr); 1817 if (error) { 1818 vfs_opterror(opts, "attach failed"); 1819 if (!created) 1820 prison_deref(pr, PD_DEREF); 1821 goto done_errmsg; 1822 } 1823 } 1824 1825 #ifdef RACCT 1826 if (racct_enable && !created) { 1827 if (!(flags & JAIL_ATTACH)) 1828 sx_sunlock(&allprison_lock); 1829 prison_racct_modify(pr); 1830 if (!(flags & JAIL_ATTACH)) 1831 sx_slock(&allprison_lock); 1832 } 1833 #endif 1834 1835 td->td_retval[0] = pr->pr_id; 1836 1837 /* 1838 * Now that it is all there, drop the temporary reference from existing 1839 * prisons. Or add a reference to newly created persistent prisons 1840 * (which was not done earlier so that the prison would not be publicly 1841 * visible). 1842 */ 1843 if (!created) { 1844 prison_deref(pr, (flags & JAIL_ATTACH) 1845 ? PD_DEREF 1846 : PD_DEREF | PD_LIST_SLOCKED); 1847 } else { 1848 if (pr_flags & PR_PERSIST) { 1849 mtx_lock(&pr->pr_mtx); 1850 pr->pr_ref++; 1851 pr->pr_uref++; 1852 mtx_unlock(&pr->pr_mtx); 1853 } 1854 if (!(flags & JAIL_ATTACH)) 1855 sx_sunlock(&allprison_lock); 1856 } 1857 1858 goto done_free; 1859 1860 done_deref_locked: 1861 prison_deref(pr, created 1862 ? PD_LOCKED | PD_LIST_XLOCKED 1863 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1864 goto done_releroot; 1865 done_unlock_list: 1866 sx_xunlock(&allprison_lock); 1867 done_releroot: 1868 if (root != NULL) 1869 vrele(root); 1870 done_errmsg: 1871 if (error) { 1872 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 1873 &errmsg_len) == 0 && errmsg_len > 0) { 1874 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1875 if (optuio->uio_segflg == UIO_SYSSPACE) 1876 bcopy(errmsg, 1877 optuio->uio_iov[errmsg_pos].iov_base, 1878 errmsg_len); 1879 else 1880 copyout(errmsg, 1881 optuio->uio_iov[errmsg_pos].iov_base, 1882 errmsg_len); 1883 } 1884 } 1885 done_free: 1886 #ifdef INET 1887 free(ip4, M_PRISON); 1888 #endif 1889 #ifdef INET6 1890 free(ip6, M_PRISON); 1891 #endif 1892 if (g_path != NULL) 1893 free(g_path, M_TEMP); 1894 vfs_freeopts(opts); 1895 return (error); 1896 } 1897 1898 /* 1899 * struct jail_get_args { 1900 * struct iovec *iovp; 1901 * unsigned int iovcnt; 1902 * int flags; 1903 * }; 1904 */ 1905 int 1906 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1907 { 1908 struct uio *auio; 1909 int error; 1910 1911 /* Check that we have an even number of iovecs. */ 1912 if (uap->iovcnt & 1) 1913 return (EINVAL); 1914 1915 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1916 if (error) 1917 return (error); 1918 error = kern_jail_get(td, auio, uap->flags); 1919 if (error == 0) 1920 error = copyout(auio->uio_iov, uap->iovp, 1921 uap->iovcnt * sizeof (struct iovec)); 1922 free(auio, M_IOV); 1923 return (error); 1924 } 1925 1926 int 1927 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1928 { 1929 struct bool_flags *bf; 1930 struct jailsys_flags *jsf; 1931 struct prison *pr, *mypr; 1932 struct vfsopt *opt; 1933 struct vfsoptlist *opts; 1934 char *errmsg, *name; 1935 int error, errmsg_len, errmsg_pos, i, jid, len, locked, pos; 1936 unsigned f; 1937 1938 if (flags & ~JAIL_GET_MASK) 1939 return (EINVAL); 1940 1941 /* Get the parameter list. */ 1942 error = vfs_buildopts(optuio, &opts); 1943 if (error) 1944 return (error); 1945 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1946 mypr = td->td_ucred->cr_prison; 1947 1948 /* 1949 * Find the prison specified by one of: lastjid, jid, name. 1950 */ 1951 sx_slock(&allprison_lock); 1952 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1953 if (error == 0) { 1954 TAILQ_FOREACH(pr, &allprison, pr_list) { 1955 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1956 mtx_lock(&pr->pr_mtx); 1957 if (pr->pr_ref > 0 && 1958 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1959 break; 1960 mtx_unlock(&pr->pr_mtx); 1961 } 1962 } 1963 if (pr != NULL) 1964 goto found_prison; 1965 error = ENOENT; 1966 vfs_opterror(opts, "no jail after %d", jid); 1967 goto done_unlock_list; 1968 } else if (error != ENOENT) 1969 goto done_unlock_list; 1970 1971 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1972 if (error == 0) { 1973 if (jid != 0) { 1974 pr = prison_find_child(mypr, jid); 1975 if (pr != NULL) { 1976 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1977 mtx_unlock(&pr->pr_mtx); 1978 error = ENOENT; 1979 vfs_opterror(opts, "jail %d is dying", 1980 jid); 1981 goto done_unlock_list; 1982 } 1983 goto found_prison; 1984 } 1985 error = ENOENT; 1986 vfs_opterror(opts, "jail %d not found", jid); 1987 goto done_unlock_list; 1988 } 1989 } else if (error != ENOENT) 1990 goto done_unlock_list; 1991 1992 error = vfs_getopt(opts, "name", (void **)&name, &len); 1993 if (error == 0) { 1994 if (len == 0 || name[len - 1] != '\0') { 1995 error = EINVAL; 1996 goto done_unlock_list; 1997 } 1998 pr = prison_find_name(mypr, name); 1999 if (pr != NULL) { 2000 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2001 mtx_unlock(&pr->pr_mtx); 2002 error = ENOENT; 2003 vfs_opterror(opts, "jail \"%s\" is dying", 2004 name); 2005 goto done_unlock_list; 2006 } 2007 goto found_prison; 2008 } 2009 error = ENOENT; 2010 vfs_opterror(opts, "jail \"%s\" not found", name); 2011 goto done_unlock_list; 2012 } else if (error != ENOENT) 2013 goto done_unlock_list; 2014 2015 vfs_opterror(opts, "no jail specified"); 2016 error = ENOENT; 2017 goto done_unlock_list; 2018 2019 found_prison: 2020 /* Get the parameters of the prison. */ 2021 pr->pr_ref++; 2022 locked = PD_LOCKED; 2023 td->td_retval[0] = pr->pr_id; 2024 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2025 if (error != 0 && error != ENOENT) 2026 goto done_deref; 2027 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2028 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2029 if (error != 0 && error != ENOENT) 2030 goto done_deref; 2031 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2032 if (error != 0 && error != ENOENT) 2033 goto done_deref; 2034 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2035 sizeof(pr->pr_cpuset->cs_id)); 2036 if (error != 0 && error != ENOENT) 2037 goto done_deref; 2038 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2039 if (error != 0 && error != ENOENT) 2040 goto done_deref; 2041 #ifdef INET 2042 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2043 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2044 if (error != 0 && error != ENOENT) 2045 goto done_deref; 2046 #endif 2047 #ifdef INET6 2048 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2049 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2050 if (error != 0 && error != ENOENT) 2051 goto done_deref; 2052 #endif 2053 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2054 sizeof(pr->pr_securelevel)); 2055 if (error != 0 && error != ENOENT) 2056 goto done_deref; 2057 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2058 sizeof(pr->pr_childcount)); 2059 if (error != 0 && error != ENOENT) 2060 goto done_deref; 2061 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2062 sizeof(pr->pr_childmax)); 2063 if (error != 0 && error != ENOENT) 2064 goto done_deref; 2065 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2066 if (error != 0 && error != ENOENT) 2067 goto done_deref; 2068 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2069 if (error != 0 && error != ENOENT) 2070 goto done_deref; 2071 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2072 if (error != 0 && error != ENOENT) 2073 goto done_deref; 2074 #ifdef COMPAT_FREEBSD32 2075 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2076 uint32_t hid32 = pr->pr_hostid; 2077 2078 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2079 } else 2080 #endif 2081 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2082 sizeof(pr->pr_hostid)); 2083 if (error != 0 && error != ENOENT) 2084 goto done_deref; 2085 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2086 sizeof(pr->pr_enforce_statfs)); 2087 if (error != 0 && error != ENOENT) 2088 goto done_deref; 2089 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2090 sizeof(pr->pr_devfs_rsnum)); 2091 if (error != 0 && error != ENOENT) 2092 goto done_deref; 2093 for (bf = pr_flag_bool; 2094 bf < pr_flag_bool + nitems(pr_flag_bool); 2095 bf++) { 2096 i = (pr->pr_flags & bf->flag) ? 1 : 0; 2097 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2098 if (error != 0 && error != ENOENT) 2099 goto done_deref; 2100 i = !i; 2101 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2102 if (error != 0 && error != ENOENT) 2103 goto done_deref; 2104 } 2105 for (jsf = pr_flag_jailsys; 2106 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 2107 jsf++) { 2108 f = pr->pr_flags & (jsf->disable | jsf->new); 2109 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE 2110 : (f == jsf->new) ? JAIL_SYS_NEW 2111 : JAIL_SYS_INHERIT; 2112 error = vfs_setopt(opts, jsf->name, &i, sizeof(i)); 2113 if (error != 0 && error != ENOENT) 2114 goto done_deref; 2115 } 2116 for (bf = pr_flag_allow; 2117 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 2118 bf++) { 2119 i = (pr->pr_allow & bf->flag) ? 1 : 0; 2120 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2121 if (error != 0 && error != ENOENT) 2122 goto done_deref; 2123 i = !i; 2124 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2125 if (error != 0 && error != ENOENT) 2126 goto done_deref; 2127 } 2128 i = (pr->pr_uref == 0); 2129 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2130 if (error != 0 && error != ENOENT) 2131 goto done_deref; 2132 i = !i; 2133 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2134 if (error != 0 && error != ENOENT) 2135 goto done_deref; 2136 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2137 sizeof(pr->pr_osreldate)); 2138 if (error != 0 && error != ENOENT) 2139 goto done_deref; 2140 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2141 if (error != 0 && error != ENOENT) 2142 goto done_deref; 2143 2144 /* Get the module parameters. */ 2145 mtx_unlock(&pr->pr_mtx); 2146 locked = 0; 2147 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2148 if (error) 2149 goto done_deref; 2150 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2151 2152 /* By now, all parameters should have been noted. */ 2153 TAILQ_FOREACH(opt, opts, link) { 2154 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2155 error = EINVAL; 2156 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2157 goto done_errmsg; 2158 } 2159 } 2160 2161 /* Write the fetched parameters back to userspace. */ 2162 error = 0; 2163 TAILQ_FOREACH(opt, opts, link) { 2164 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2165 pos = 2 * opt->pos + 1; 2166 optuio->uio_iov[pos].iov_len = opt->len; 2167 if (opt->value != NULL) { 2168 if (optuio->uio_segflg == UIO_SYSSPACE) { 2169 bcopy(opt->value, 2170 optuio->uio_iov[pos].iov_base, 2171 opt->len); 2172 } else { 2173 error = copyout(opt->value, 2174 optuio->uio_iov[pos].iov_base, 2175 opt->len); 2176 if (error) 2177 break; 2178 } 2179 } 2180 } 2181 } 2182 goto done_errmsg; 2183 2184 done_deref: 2185 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2186 goto done_errmsg; 2187 2188 done_unlock_list: 2189 sx_sunlock(&allprison_lock); 2190 done_errmsg: 2191 if (error && errmsg_pos >= 0) { 2192 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2193 errmsg_pos = 2 * errmsg_pos + 1; 2194 if (errmsg_len > 0) { 2195 if (optuio->uio_segflg == UIO_SYSSPACE) 2196 bcopy(errmsg, 2197 optuio->uio_iov[errmsg_pos].iov_base, 2198 errmsg_len); 2199 else 2200 copyout(errmsg, 2201 optuio->uio_iov[errmsg_pos].iov_base, 2202 errmsg_len); 2203 } 2204 } 2205 vfs_freeopts(opts); 2206 return (error); 2207 } 2208 2209 /* 2210 * struct jail_remove_args { 2211 * int jid; 2212 * }; 2213 */ 2214 int 2215 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2216 { 2217 struct prison *pr, *cpr, *lpr, *tpr; 2218 int descend, error; 2219 2220 error = priv_check(td, PRIV_JAIL_REMOVE); 2221 if (error) 2222 return (error); 2223 2224 sx_xlock(&allprison_lock); 2225 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2226 if (pr == NULL) { 2227 sx_xunlock(&allprison_lock); 2228 return (EINVAL); 2229 } 2230 2231 /* Remove all descendants of this prison, then remove this prison. */ 2232 pr->pr_ref++; 2233 if (!LIST_EMPTY(&pr->pr_children)) { 2234 mtx_unlock(&pr->pr_mtx); 2235 lpr = NULL; 2236 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2237 mtx_lock(&cpr->pr_mtx); 2238 if (cpr->pr_ref > 0) { 2239 tpr = cpr; 2240 cpr->pr_ref++; 2241 } else { 2242 /* Already removed - do not do it again. */ 2243 tpr = NULL; 2244 } 2245 mtx_unlock(&cpr->pr_mtx); 2246 if (lpr != NULL) { 2247 mtx_lock(&lpr->pr_mtx); 2248 prison_remove_one(lpr); 2249 sx_xlock(&allprison_lock); 2250 } 2251 lpr = tpr; 2252 } 2253 if (lpr != NULL) { 2254 mtx_lock(&lpr->pr_mtx); 2255 prison_remove_one(lpr); 2256 sx_xlock(&allprison_lock); 2257 } 2258 mtx_lock(&pr->pr_mtx); 2259 } 2260 prison_remove_one(pr); 2261 return (0); 2262 } 2263 2264 static void 2265 prison_remove_one(struct prison *pr) 2266 { 2267 struct proc *p; 2268 int deuref; 2269 2270 /* If the prison was persistent, it is not anymore. */ 2271 deuref = 0; 2272 if (pr->pr_flags & PR_PERSIST) { 2273 pr->pr_ref--; 2274 deuref = PD_DEUREF; 2275 pr->pr_flags &= ~PR_PERSIST; 2276 } 2277 2278 /* 2279 * jail_remove added a reference. If that's the only one, remove 2280 * the prison now. 2281 */ 2282 KASSERT(pr->pr_ref > 0, 2283 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2284 if (pr->pr_ref == 1) { 2285 prison_deref(pr, 2286 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2287 return; 2288 } 2289 2290 mtx_unlock(&pr->pr_mtx); 2291 sx_xunlock(&allprison_lock); 2292 /* 2293 * Kill all processes unfortunate enough to be attached to this prison. 2294 */ 2295 sx_slock(&allproc_lock); 2296 FOREACH_PROC_IN_SYSTEM(p) { 2297 PROC_LOCK(p); 2298 if (p->p_state != PRS_NEW && p->p_ucred && 2299 p->p_ucred->cr_prison == pr) 2300 kern_psignal(p, SIGKILL); 2301 PROC_UNLOCK(p); 2302 } 2303 sx_sunlock(&allproc_lock); 2304 /* Remove the temporary reference added by jail_remove. */ 2305 prison_deref(pr, deuref | PD_DEREF); 2306 } 2307 2308 /* 2309 * struct jail_attach_args { 2310 * int jid; 2311 * }; 2312 */ 2313 int 2314 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2315 { 2316 struct prison *pr; 2317 int error; 2318 2319 error = priv_check(td, PRIV_JAIL_ATTACH); 2320 if (error) 2321 return (error); 2322 2323 /* 2324 * Start with exclusive hold on allprison_lock to ensure that a possible 2325 * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove. 2326 * But then immediately downgrade it since we don't need to stop 2327 * readers. 2328 */ 2329 sx_xlock(&allprison_lock); 2330 sx_downgrade(&allprison_lock); 2331 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2332 if (pr == NULL) { 2333 sx_sunlock(&allprison_lock); 2334 return (EINVAL); 2335 } 2336 2337 /* 2338 * Do not allow a process to attach to a prison that is not 2339 * considered to be "alive". 2340 */ 2341 if (pr->pr_uref == 0) { 2342 mtx_unlock(&pr->pr_mtx); 2343 sx_sunlock(&allprison_lock); 2344 return (EINVAL); 2345 } 2346 2347 return (do_jail_attach(td, pr)); 2348 } 2349 2350 static int 2351 do_jail_attach(struct thread *td, struct prison *pr) 2352 { 2353 struct proc *p; 2354 struct ucred *newcred, *oldcred; 2355 int error; 2356 2357 /* 2358 * XXX: Note that there is a slight race here if two threads 2359 * in the same privileged process attempt to attach to two 2360 * different jails at the same time. It is important for 2361 * user processes not to do this, or they might end up with 2362 * a process root from one prison, but attached to the jail 2363 * of another. 2364 */ 2365 pr->pr_ref++; 2366 pr->pr_uref++; 2367 mtx_unlock(&pr->pr_mtx); 2368 2369 /* Let modules do whatever they need to prepare for attaching. */ 2370 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2371 if (error) { 2372 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2373 return (error); 2374 } 2375 sx_sunlock(&allprison_lock); 2376 2377 /* 2378 * Reparent the newly attached process to this jail. 2379 */ 2380 p = td->td_proc; 2381 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2382 if (error) 2383 goto e_revert_osd; 2384 2385 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2386 if ((error = change_dir(pr->pr_root, td)) != 0) 2387 goto e_unlock; 2388 #ifdef MAC 2389 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2390 goto e_unlock; 2391 #endif 2392 VOP_UNLOCK(pr->pr_root); 2393 if ((error = pwd_chroot(td, pr->pr_root))) 2394 goto e_revert_osd; 2395 2396 newcred = crget(); 2397 PROC_LOCK(p); 2398 oldcred = crcopysafe(p, newcred); 2399 newcred->cr_prison = pr; 2400 proc_set_cred(p, newcred); 2401 setsugid(p); 2402 #ifdef RACCT 2403 racct_proc_ucred_changed(p, oldcred, newcred); 2404 crhold(newcred); 2405 #endif 2406 PROC_UNLOCK(p); 2407 #ifdef RCTL 2408 rctl_proc_ucred_changed(p, newcred); 2409 crfree(newcred); 2410 #endif 2411 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF); 2412 crfree(oldcred); 2413 return (0); 2414 2415 e_unlock: 2416 VOP_UNLOCK(pr->pr_root); 2417 e_revert_osd: 2418 /* Tell modules this thread is still in its old jail after all. */ 2419 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2420 prison_deref(pr, PD_DEREF | PD_DEUREF); 2421 return (error); 2422 } 2423 2424 /* 2425 * Returns a locked prison instance, or NULL on failure. 2426 */ 2427 struct prison * 2428 prison_find(int prid) 2429 { 2430 struct prison *pr; 2431 2432 sx_assert(&allprison_lock, SX_LOCKED); 2433 TAILQ_FOREACH(pr, &allprison, pr_list) { 2434 if (pr->pr_id == prid) { 2435 mtx_lock(&pr->pr_mtx); 2436 if (pr->pr_ref > 0) 2437 return (pr); 2438 mtx_unlock(&pr->pr_mtx); 2439 } 2440 } 2441 return (NULL); 2442 } 2443 2444 /* 2445 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2446 */ 2447 struct prison * 2448 prison_find_child(struct prison *mypr, int prid) 2449 { 2450 struct prison *pr; 2451 int descend; 2452 2453 sx_assert(&allprison_lock, SX_LOCKED); 2454 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2455 if (pr->pr_id == prid) { 2456 mtx_lock(&pr->pr_mtx); 2457 if (pr->pr_ref > 0) 2458 return (pr); 2459 mtx_unlock(&pr->pr_mtx); 2460 } 2461 } 2462 return (NULL); 2463 } 2464 2465 /* 2466 * Look for the name relative to mypr. Returns a locked prison or NULL. 2467 */ 2468 struct prison * 2469 prison_find_name(struct prison *mypr, const char *name) 2470 { 2471 struct prison *pr, *deadpr; 2472 size_t mylen; 2473 int descend; 2474 2475 sx_assert(&allprison_lock, SX_LOCKED); 2476 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2477 again: 2478 deadpr = NULL; 2479 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2480 if (!strcmp(pr->pr_name + mylen, name)) { 2481 mtx_lock(&pr->pr_mtx); 2482 if (pr->pr_ref > 0) { 2483 if (pr->pr_uref > 0) 2484 return (pr); 2485 deadpr = pr; 2486 } 2487 mtx_unlock(&pr->pr_mtx); 2488 } 2489 } 2490 /* There was no valid prison - perhaps there was a dying one. */ 2491 if (deadpr != NULL) { 2492 mtx_lock(&deadpr->pr_mtx); 2493 if (deadpr->pr_ref == 0) { 2494 mtx_unlock(&deadpr->pr_mtx); 2495 goto again; 2496 } 2497 } 2498 return (deadpr); 2499 } 2500 2501 /* 2502 * See if a prison has the specific flag set. 2503 */ 2504 int 2505 prison_flag(struct ucred *cred, unsigned flag) 2506 { 2507 2508 /* This is an atomic read, so no locking is necessary. */ 2509 return (cred->cr_prison->pr_flags & flag); 2510 } 2511 2512 int 2513 prison_allow(struct ucred *cred, unsigned flag) 2514 { 2515 2516 /* This is an atomic read, so no locking is necessary. */ 2517 return (cred->cr_prison->pr_allow & flag); 2518 } 2519 2520 /* 2521 * Remove a prison reference. If that was the last reference, remove the 2522 * prison itself - but not in this context in case there are locks held. 2523 */ 2524 void 2525 prison_free_locked(struct prison *pr) 2526 { 2527 int ref; 2528 2529 mtx_assert(&pr->pr_mtx, MA_OWNED); 2530 ref = --pr->pr_ref; 2531 mtx_unlock(&pr->pr_mtx); 2532 if (ref == 0) 2533 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2534 } 2535 2536 void 2537 prison_free(struct prison *pr) 2538 { 2539 2540 mtx_lock(&pr->pr_mtx); 2541 prison_free_locked(pr); 2542 } 2543 2544 /* 2545 * Complete a call to either prison_free or prison_proc_free. 2546 */ 2547 static void 2548 prison_complete(void *context, int pending) 2549 { 2550 struct prison *pr = context; 2551 2552 sx_xlock(&allprison_lock); 2553 mtx_lock(&pr->pr_mtx); 2554 prison_deref(pr, pr->pr_uref 2555 ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED 2556 : PD_LOCKED | PD_LIST_XLOCKED); 2557 } 2558 2559 /* 2560 * Remove a prison reference (usually). This internal version assumes no 2561 * mutexes are held, except perhaps the prison itself. If there are no more 2562 * references, release and delist the prison. On completion, the prison lock 2563 * and the allprison lock are both unlocked. 2564 */ 2565 static void 2566 prison_deref(struct prison *pr, int flags) 2567 { 2568 struct prison *ppr, *tpr; 2569 int ref, lasturef; 2570 2571 if (!(flags & PD_LOCKED)) 2572 mtx_lock(&pr->pr_mtx); 2573 for (;;) { 2574 if (flags & PD_DEUREF) { 2575 KASSERT(pr->pr_uref > 0, 2576 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 2577 pr->pr_id)); 2578 pr->pr_uref--; 2579 lasturef = pr->pr_uref == 0; 2580 if (lasturef) 2581 pr->pr_ref++; 2582 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2583 } else 2584 lasturef = 0; 2585 if (flags & PD_DEREF) { 2586 KASSERT(pr->pr_ref > 0, 2587 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 2588 pr->pr_id)); 2589 pr->pr_ref--; 2590 } 2591 ref = pr->pr_ref; 2592 mtx_unlock(&pr->pr_mtx); 2593 2594 /* 2595 * Tell the modules if the last user reference was removed 2596 * (even it sticks around in dying state). 2597 */ 2598 if (lasturef) { 2599 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) { 2600 sx_xlock(&allprison_lock); 2601 flags |= PD_LIST_XLOCKED; 2602 } 2603 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 2604 mtx_lock(&pr->pr_mtx); 2605 ref = --pr->pr_ref; 2606 mtx_unlock(&pr->pr_mtx); 2607 } 2608 2609 /* If the prison still has references, nothing else to do. */ 2610 if (ref > 0) { 2611 if (flags & PD_LIST_SLOCKED) 2612 sx_sunlock(&allprison_lock); 2613 else if (flags & PD_LIST_XLOCKED) 2614 sx_xunlock(&allprison_lock); 2615 return; 2616 } 2617 2618 if (flags & PD_LIST_SLOCKED) { 2619 if (!sx_try_upgrade(&allprison_lock)) { 2620 sx_sunlock(&allprison_lock); 2621 sx_xlock(&allprison_lock); 2622 } 2623 } else if (!(flags & PD_LIST_XLOCKED)) 2624 sx_xlock(&allprison_lock); 2625 2626 TAILQ_REMOVE(&allprison, pr, pr_list); 2627 LIST_REMOVE(pr, pr_sibling); 2628 ppr = pr->pr_parent; 2629 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2630 tpr->pr_childcount--; 2631 sx_xunlock(&allprison_lock); 2632 2633 #ifdef VIMAGE 2634 if (pr->pr_vnet != ppr->pr_vnet) 2635 vnet_destroy(pr->pr_vnet); 2636 #endif 2637 if (pr->pr_root != NULL) 2638 vrele(pr->pr_root); 2639 mtx_destroy(&pr->pr_mtx); 2640 #ifdef INET 2641 free(pr->pr_ip4, M_PRISON); 2642 #endif 2643 #ifdef INET6 2644 free(pr->pr_ip6, M_PRISON); 2645 #endif 2646 if (pr->pr_cpuset != NULL) 2647 cpuset_rel(pr->pr_cpuset); 2648 osd_jail_exit(pr); 2649 #ifdef RACCT 2650 if (racct_enable) 2651 prison_racct_detach(pr); 2652 #endif 2653 free(pr, M_PRISON); 2654 2655 /* Removing a prison frees a reference on its parent. */ 2656 pr = ppr; 2657 mtx_lock(&pr->pr_mtx); 2658 flags = PD_DEREF | PD_DEUREF; 2659 } 2660 } 2661 2662 void 2663 prison_hold_locked(struct prison *pr) 2664 { 2665 2666 mtx_assert(&pr->pr_mtx, MA_OWNED); 2667 KASSERT(pr->pr_ref > 0, 2668 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id)); 2669 pr->pr_ref++; 2670 } 2671 2672 void 2673 prison_hold(struct prison *pr) 2674 { 2675 2676 mtx_lock(&pr->pr_mtx); 2677 prison_hold_locked(pr); 2678 mtx_unlock(&pr->pr_mtx); 2679 } 2680 2681 void 2682 prison_proc_hold(struct prison *pr) 2683 { 2684 2685 mtx_lock(&pr->pr_mtx); 2686 KASSERT(pr->pr_uref > 0, 2687 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2688 pr->pr_uref++; 2689 mtx_unlock(&pr->pr_mtx); 2690 } 2691 2692 void 2693 prison_proc_free(struct prison *pr) 2694 { 2695 2696 mtx_lock(&pr->pr_mtx); 2697 KASSERT(pr->pr_uref > 0, 2698 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2699 if (pr->pr_uref > 1) 2700 pr->pr_uref--; 2701 else { 2702 /* 2703 * Don't remove the last user reference in this context, which 2704 * is expected to be a process that is not only locked, but 2705 * also half dead. 2706 */ 2707 pr->pr_ref++; 2708 mtx_unlock(&pr->pr_mtx); 2709 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2710 return; 2711 } 2712 mtx_unlock(&pr->pr_mtx); 2713 } 2714 2715 /* 2716 * Check if a jail supports the given address family. 2717 * 2718 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 2719 * if not. 2720 */ 2721 int 2722 prison_check_af(struct ucred *cred, int af) 2723 { 2724 struct prison *pr; 2725 int error; 2726 2727 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2728 2729 pr = cred->cr_prison; 2730 #ifdef VIMAGE 2731 /* Prisons with their own network stack are not limited. */ 2732 if (prison_owns_vnet(cred)) 2733 return (0); 2734 #endif 2735 2736 error = 0; 2737 switch (af) 2738 { 2739 #ifdef INET 2740 case AF_INET: 2741 if (pr->pr_flags & PR_IP4) 2742 { 2743 mtx_lock(&pr->pr_mtx); 2744 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 2745 error = EAFNOSUPPORT; 2746 mtx_unlock(&pr->pr_mtx); 2747 } 2748 break; 2749 #endif 2750 #ifdef INET6 2751 case AF_INET6: 2752 if (pr->pr_flags & PR_IP6) 2753 { 2754 mtx_lock(&pr->pr_mtx); 2755 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 2756 error = EAFNOSUPPORT; 2757 mtx_unlock(&pr->pr_mtx); 2758 } 2759 break; 2760 #endif 2761 case AF_LOCAL: 2762 case AF_ROUTE: 2763 break; 2764 default: 2765 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 2766 error = EAFNOSUPPORT; 2767 } 2768 return (error); 2769 } 2770 2771 /* 2772 * Check if given address belongs to the jail referenced by cred (wrapper to 2773 * prison_check_ip[46]). 2774 * 2775 * Returns 0 if jail doesn't restrict the address family or if address belongs 2776 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 2777 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 2778 */ 2779 int 2780 prison_if(struct ucred *cred, const struct sockaddr *sa) 2781 { 2782 #ifdef INET 2783 const struct sockaddr_in *sai; 2784 #endif 2785 #ifdef INET6 2786 const struct sockaddr_in6 *sai6; 2787 #endif 2788 int error; 2789 2790 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2791 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 2792 2793 #ifdef VIMAGE 2794 if (prison_owns_vnet(cred)) 2795 return (0); 2796 #endif 2797 2798 error = 0; 2799 switch (sa->sa_family) 2800 { 2801 #ifdef INET 2802 case AF_INET: 2803 sai = (const struct sockaddr_in *)sa; 2804 error = prison_check_ip4(cred, &sai->sin_addr); 2805 break; 2806 #endif 2807 #ifdef INET6 2808 case AF_INET6: 2809 sai6 = (const struct sockaddr_in6 *)sa; 2810 error = prison_check_ip6(cred, &sai6->sin6_addr); 2811 break; 2812 #endif 2813 default: 2814 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 2815 error = EAFNOSUPPORT; 2816 } 2817 return (error); 2818 } 2819 2820 /* 2821 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 2822 */ 2823 int 2824 prison_check(struct ucred *cred1, struct ucred *cred2) 2825 { 2826 2827 return ((cred1->cr_prison == cred2->cr_prison || 2828 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 2829 } 2830 2831 /* 2832 * Return 1 if p2 is a child of p1, otherwise 0. 2833 */ 2834 int 2835 prison_ischild(struct prison *pr1, struct prison *pr2) 2836 { 2837 2838 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 2839 if (pr1 == pr2) 2840 return (1); 2841 return (0); 2842 } 2843 2844 /* 2845 * Return 1 if the passed credential is in a jail, otherwise 0. 2846 */ 2847 int 2848 jailed(struct ucred *cred) 2849 { 2850 2851 return (cred->cr_prison != &prison0); 2852 } 2853 2854 /* 2855 * Return 1 if the passed credential is in a jail and that jail does not 2856 * have its own virtual network stack, otherwise 0. 2857 */ 2858 int 2859 jailed_without_vnet(struct ucred *cred) 2860 { 2861 2862 if (!jailed(cred)) 2863 return (0); 2864 #ifdef VIMAGE 2865 if (prison_owns_vnet(cred)) 2866 return (0); 2867 #endif 2868 2869 return (1); 2870 } 2871 2872 /* 2873 * Return the correct hostname (domainname, et al) for the passed credential. 2874 */ 2875 void 2876 getcredhostname(struct ucred *cred, char *buf, size_t size) 2877 { 2878 struct prison *pr; 2879 2880 /* 2881 * A NULL credential can be used to shortcut to the physical 2882 * system's hostname. 2883 */ 2884 pr = (cred != NULL) ? cred->cr_prison : &prison0; 2885 mtx_lock(&pr->pr_mtx); 2886 strlcpy(buf, pr->pr_hostname, size); 2887 mtx_unlock(&pr->pr_mtx); 2888 } 2889 2890 void 2891 getcreddomainname(struct ucred *cred, char *buf, size_t size) 2892 { 2893 2894 mtx_lock(&cred->cr_prison->pr_mtx); 2895 strlcpy(buf, cred->cr_prison->pr_domainname, size); 2896 mtx_unlock(&cred->cr_prison->pr_mtx); 2897 } 2898 2899 void 2900 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 2901 { 2902 2903 mtx_lock(&cred->cr_prison->pr_mtx); 2904 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 2905 mtx_unlock(&cred->cr_prison->pr_mtx); 2906 } 2907 2908 void 2909 getcredhostid(struct ucred *cred, unsigned long *hostid) 2910 { 2911 2912 mtx_lock(&cred->cr_prison->pr_mtx); 2913 *hostid = cred->cr_prison->pr_hostid; 2914 mtx_unlock(&cred->cr_prison->pr_mtx); 2915 } 2916 2917 #ifdef VIMAGE 2918 /* 2919 * Determine whether the prison represented by cred owns 2920 * its vnet rather than having it inherited. 2921 * 2922 * Returns 1 in case the prison owns the vnet, 0 otherwise. 2923 */ 2924 int 2925 prison_owns_vnet(struct ucred *cred) 2926 { 2927 2928 /* 2929 * vnets cannot be added/removed after jail creation, 2930 * so no need to lock here. 2931 */ 2932 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 2933 } 2934 #endif 2935 2936 /* 2937 * Determine whether the subject represented by cred can "see" 2938 * status of a mount point. 2939 * Returns: 0 for permitted, ENOENT otherwise. 2940 * XXX: This function should be called cr_canseemount() and should be 2941 * placed in kern_prot.c. 2942 */ 2943 int 2944 prison_canseemount(struct ucred *cred, struct mount *mp) 2945 { 2946 struct prison *pr; 2947 struct statfs *sp; 2948 size_t len; 2949 2950 pr = cred->cr_prison; 2951 if (pr->pr_enforce_statfs == 0) 2952 return (0); 2953 if (pr->pr_root->v_mount == mp) 2954 return (0); 2955 if (pr->pr_enforce_statfs == 2) 2956 return (ENOENT); 2957 /* 2958 * If jail's chroot directory is set to "/" we should be able to see 2959 * all mount-points from inside a jail. 2960 * This is ugly check, but this is the only situation when jail's 2961 * directory ends with '/'. 2962 */ 2963 if (strcmp(pr->pr_path, "/") == 0) 2964 return (0); 2965 len = strlen(pr->pr_path); 2966 sp = &mp->mnt_stat; 2967 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 2968 return (ENOENT); 2969 /* 2970 * Be sure that we don't have situation where jail's root directory 2971 * is "/some/path" and mount point is "/some/pathpath". 2972 */ 2973 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 2974 return (ENOENT); 2975 return (0); 2976 } 2977 2978 void 2979 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 2980 { 2981 char jpath[MAXPATHLEN]; 2982 struct prison *pr; 2983 size_t len; 2984 2985 pr = cred->cr_prison; 2986 if (pr->pr_enforce_statfs == 0) 2987 return; 2988 if (prison_canseemount(cred, mp) != 0) { 2989 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 2990 strlcpy(sp->f_mntonname, "[restricted]", 2991 sizeof(sp->f_mntonname)); 2992 return; 2993 } 2994 if (pr->pr_root->v_mount == mp) { 2995 /* 2996 * Clear current buffer data, so we are sure nothing from 2997 * the valid path left there. 2998 */ 2999 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3000 *sp->f_mntonname = '/'; 3001 return; 3002 } 3003 /* 3004 * If jail's chroot directory is set to "/" we should be able to see 3005 * all mount-points from inside a jail. 3006 */ 3007 if (strcmp(pr->pr_path, "/") == 0) 3008 return; 3009 len = strlen(pr->pr_path); 3010 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3011 /* 3012 * Clear current buffer data, so we are sure nothing from 3013 * the valid path left there. 3014 */ 3015 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3016 if (*jpath == '\0') { 3017 /* Should never happen. */ 3018 *sp->f_mntonname = '/'; 3019 } else { 3020 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3021 } 3022 } 3023 3024 /* 3025 * Check with permission for a specific privilege is granted within jail. We 3026 * have a specific list of accepted privileges; the rest are denied. 3027 */ 3028 int 3029 prison_priv_check(struct ucred *cred, int priv) 3030 { 3031 3032 if (!jailed(cred)) 3033 return (0); 3034 3035 #ifdef VIMAGE 3036 /* 3037 * Privileges specific to prisons with a virtual network stack. 3038 * There might be a duplicate entry here in case the privilege 3039 * is only granted conditionally in the legacy jail case. 3040 */ 3041 switch (priv) { 3042 #ifdef notyet 3043 /* 3044 * NFS-specific privileges. 3045 */ 3046 case PRIV_NFS_DAEMON: 3047 case PRIV_NFS_LOCKD: 3048 #endif 3049 /* 3050 * Network stack privileges. 3051 */ 3052 case PRIV_NET_BRIDGE: 3053 case PRIV_NET_GRE: 3054 case PRIV_NET_BPF: 3055 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3056 case PRIV_NET_ROUTE: 3057 case PRIV_NET_TAP: 3058 case PRIV_NET_SETIFMTU: 3059 case PRIV_NET_SETIFFLAGS: 3060 case PRIV_NET_SETIFCAP: 3061 case PRIV_NET_SETIFDESCR: 3062 case PRIV_NET_SETIFNAME : 3063 case PRIV_NET_SETIFMETRIC: 3064 case PRIV_NET_SETIFPHYS: 3065 case PRIV_NET_SETIFMAC: 3066 case PRIV_NET_SETLANPCP: 3067 case PRIV_NET_ADDMULTI: 3068 case PRIV_NET_DELMULTI: 3069 case PRIV_NET_HWIOCTL: 3070 case PRIV_NET_SETLLADDR: 3071 case PRIV_NET_ADDIFGROUP: 3072 case PRIV_NET_DELIFGROUP: 3073 case PRIV_NET_IFCREATE: 3074 case PRIV_NET_IFDESTROY: 3075 case PRIV_NET_ADDIFADDR: 3076 case PRIV_NET_DELIFADDR: 3077 case PRIV_NET_LAGG: 3078 case PRIV_NET_GIF: 3079 case PRIV_NET_SETIFVNET: 3080 case PRIV_NET_SETIFFIB: 3081 3082 /* 3083 * 802.11-related privileges. 3084 */ 3085 case PRIV_NET80211_GETKEY: 3086 #ifdef notyet 3087 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3088 #endif 3089 3090 #ifdef notyet 3091 /* 3092 * ATM privileges. 3093 */ 3094 case PRIV_NETATM_CFG: 3095 case PRIV_NETATM_ADD: 3096 case PRIV_NETATM_DEL: 3097 case PRIV_NETATM_SET: 3098 3099 /* 3100 * Bluetooth privileges. 3101 */ 3102 case PRIV_NETBLUETOOTH_RAW: 3103 #endif 3104 3105 /* 3106 * Netgraph and netgraph module privileges. 3107 */ 3108 case PRIV_NETGRAPH_CONTROL: 3109 #ifdef notyet 3110 case PRIV_NETGRAPH_TTY: 3111 #endif 3112 3113 /* 3114 * IPv4 and IPv6 privileges. 3115 */ 3116 case PRIV_NETINET_IPFW: 3117 case PRIV_NETINET_DIVERT: 3118 case PRIV_NETINET_PF: 3119 case PRIV_NETINET_DUMMYNET: 3120 case PRIV_NETINET_CARP: 3121 case PRIV_NETINET_MROUTE: 3122 case PRIV_NETINET_RAW: 3123 case PRIV_NETINET_ADDRCTRL6: 3124 case PRIV_NETINET_ND6: 3125 case PRIV_NETINET_SCOPE6: 3126 case PRIV_NETINET_ALIFETIME6: 3127 case PRIV_NETINET_IPSEC: 3128 case PRIV_NETINET_BINDANY: 3129 3130 #ifdef notyet 3131 /* 3132 * NCP privileges. 3133 */ 3134 case PRIV_NETNCP: 3135 3136 /* 3137 * SMB privileges. 3138 */ 3139 case PRIV_NETSMB: 3140 #endif 3141 3142 /* 3143 * No default: or deny here. 3144 * In case of no permit fall through to next switch(). 3145 */ 3146 if (cred->cr_prison->pr_flags & PR_VNET) 3147 return (0); 3148 } 3149 #endif /* VIMAGE */ 3150 3151 switch (priv) { 3152 3153 /* 3154 * Allow ktrace privileges for root in jail. 3155 */ 3156 case PRIV_KTRACE: 3157 3158 #if 0 3159 /* 3160 * Allow jailed processes to configure audit identity and 3161 * submit audit records (login, etc). In the future we may 3162 * want to further refine the relationship between audit and 3163 * jail. 3164 */ 3165 case PRIV_AUDIT_GETAUDIT: 3166 case PRIV_AUDIT_SETAUDIT: 3167 case PRIV_AUDIT_SUBMIT: 3168 #endif 3169 3170 /* 3171 * Allow jailed processes to manipulate process UNIX 3172 * credentials in any way they see fit. 3173 */ 3174 case PRIV_CRED_SETUID: 3175 case PRIV_CRED_SETEUID: 3176 case PRIV_CRED_SETGID: 3177 case PRIV_CRED_SETEGID: 3178 case PRIV_CRED_SETGROUPS: 3179 case PRIV_CRED_SETREUID: 3180 case PRIV_CRED_SETREGID: 3181 case PRIV_CRED_SETRESUID: 3182 case PRIV_CRED_SETRESGID: 3183 3184 /* 3185 * Jail implements visibility constraints already, so allow 3186 * jailed root to override uid/gid-based constraints. 3187 */ 3188 case PRIV_SEEOTHERGIDS: 3189 case PRIV_SEEOTHERUIDS: 3190 3191 /* 3192 * Jail implements inter-process debugging limits already, so 3193 * allow jailed root various debugging privileges. 3194 */ 3195 case PRIV_DEBUG_DIFFCRED: 3196 case PRIV_DEBUG_SUGID: 3197 case PRIV_DEBUG_UNPRIV: 3198 3199 /* 3200 * Allow jail to set various resource limits and login 3201 * properties, and for now, exceed process resource limits. 3202 */ 3203 case PRIV_PROC_LIMIT: 3204 case PRIV_PROC_SETLOGIN: 3205 case PRIV_PROC_SETRLIMIT: 3206 3207 /* 3208 * System V and POSIX IPC privileges are granted in jail. 3209 */ 3210 case PRIV_IPC_READ: 3211 case PRIV_IPC_WRITE: 3212 case PRIV_IPC_ADMIN: 3213 case PRIV_IPC_MSGSIZE: 3214 case PRIV_MQ_ADMIN: 3215 3216 /* 3217 * Jail operations within a jail work on child jails. 3218 */ 3219 case PRIV_JAIL_ATTACH: 3220 case PRIV_JAIL_SET: 3221 case PRIV_JAIL_REMOVE: 3222 3223 /* 3224 * Jail implements its own inter-process limits, so allow 3225 * root processes in jail to change scheduling on other 3226 * processes in the same jail. Likewise for signalling. 3227 */ 3228 case PRIV_SCHED_DIFFCRED: 3229 case PRIV_SCHED_CPUSET: 3230 case PRIV_SIGNAL_DIFFCRED: 3231 case PRIV_SIGNAL_SUGID: 3232 3233 /* 3234 * Allow jailed processes to write to sysctls marked as jail 3235 * writable. 3236 */ 3237 case PRIV_SYSCTL_WRITEJAIL: 3238 3239 /* 3240 * Allow root in jail to manage a variety of quota 3241 * properties. These should likely be conditional on a 3242 * configuration option. 3243 */ 3244 case PRIV_VFS_GETQUOTA: 3245 case PRIV_VFS_SETQUOTA: 3246 3247 /* 3248 * Since Jail relies on chroot() to implement file system 3249 * protections, grant many VFS privileges to root in jail. 3250 * Be careful to exclude mount-related and NFS-related 3251 * privileges. 3252 */ 3253 case PRIV_VFS_READ: 3254 case PRIV_VFS_WRITE: 3255 case PRIV_VFS_ADMIN: 3256 case PRIV_VFS_EXEC: 3257 case PRIV_VFS_LOOKUP: 3258 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3259 case PRIV_VFS_CHFLAGS_DEV: 3260 case PRIV_VFS_CHOWN: 3261 case PRIV_VFS_CHROOT: 3262 case PRIV_VFS_RETAINSUGID: 3263 case PRIV_VFS_FCHROOT: 3264 case PRIV_VFS_LINK: 3265 case PRIV_VFS_SETGID: 3266 case PRIV_VFS_STAT: 3267 case PRIV_VFS_STICKYFILE: 3268 3269 /* 3270 * As in the non-jail case, non-root users are expected to be 3271 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3272 * exists in the jail and they have permission to access it). 3273 */ 3274 case PRIV_KMEM_READ: 3275 return (0); 3276 3277 /* 3278 * Depending on the global setting, allow privilege of 3279 * setting system flags. 3280 */ 3281 case PRIV_VFS_SYSFLAGS: 3282 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3283 return (0); 3284 else 3285 return (EPERM); 3286 3287 /* 3288 * Depending on the global setting, allow privilege of 3289 * mounting/unmounting file systems. 3290 */ 3291 case PRIV_VFS_MOUNT: 3292 case PRIV_VFS_UNMOUNT: 3293 case PRIV_VFS_MOUNT_NONUSER: 3294 case PRIV_VFS_MOUNT_OWNER: 3295 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3296 cred->cr_prison->pr_enforce_statfs < 2) 3297 return (0); 3298 else 3299 return (EPERM); 3300 3301 /* 3302 * Conditionnaly allow locking (unlocking) physical pages 3303 * in memory. 3304 */ 3305 case PRIV_VM_MLOCK: 3306 case PRIV_VM_MUNLOCK: 3307 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK) 3308 return (0); 3309 else 3310 return (EPERM); 3311 3312 /* 3313 * Conditionally allow jailed root to bind reserved ports. 3314 */ 3315 case PRIV_NETINET_RESERVEDPORT: 3316 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS) 3317 return (0); 3318 else 3319 return (EPERM); 3320 3321 /* 3322 * Allow jailed root to reuse in-use ports. 3323 */ 3324 case PRIV_NETINET_REUSEPORT: 3325 return (0); 3326 3327 /* 3328 * Allow jailed root to set certain IPv4/6 (option) headers. 3329 */ 3330 case PRIV_NETINET_SETHDROPTS: 3331 return (0); 3332 3333 /* 3334 * Conditionally allow creating raw sockets in jail. 3335 */ 3336 case PRIV_NETINET_RAW: 3337 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3338 return (0); 3339 else 3340 return (EPERM); 3341 3342 /* 3343 * Since jail implements its own visibility limits on netstat 3344 * sysctls, allow getcred. This allows identd to work in 3345 * jail. 3346 */ 3347 case PRIV_NETINET_GETCRED: 3348 return (0); 3349 3350 /* 3351 * Allow jailed root to set loginclass. 3352 */ 3353 case PRIV_PROC_SETLOGINCLASS: 3354 return (0); 3355 3356 /* 3357 * Do not allow a process inside a jail to read the kernel 3358 * message buffer unless explicitly permitted. 3359 */ 3360 case PRIV_MSGBUF: 3361 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF) 3362 return (0); 3363 return (EPERM); 3364 3365 default: 3366 /* 3367 * In all remaining cases, deny the privilege request. This 3368 * includes almost all network privileges, many system 3369 * configuration privileges. 3370 */ 3371 return (EPERM); 3372 } 3373 } 3374 3375 /* 3376 * Return the part of pr2's name that is relative to pr1, or the whole name 3377 * if it does not directly follow. 3378 */ 3379 3380 char * 3381 prison_name(struct prison *pr1, struct prison *pr2) 3382 { 3383 char *name; 3384 3385 /* Jails see themselves as "0" (if they see themselves at all). */ 3386 if (pr1 == pr2) 3387 return "0"; 3388 name = pr2->pr_name; 3389 if (prison_ischild(pr1, pr2)) { 3390 /* 3391 * pr1 isn't locked (and allprison_lock may not be either) 3392 * so its length can't be counted on. But the number of dots 3393 * can be counted on - and counted. 3394 */ 3395 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3396 name = strchr(name, '.') + 1; 3397 } 3398 return (name); 3399 } 3400 3401 /* 3402 * Return the part of pr2's path that is relative to pr1, or the whole path 3403 * if it does not directly follow. 3404 */ 3405 static char * 3406 prison_path(struct prison *pr1, struct prison *pr2) 3407 { 3408 char *path1, *path2; 3409 int len1; 3410 3411 path1 = pr1->pr_path; 3412 path2 = pr2->pr_path; 3413 if (!strcmp(path1, "/")) 3414 return (path2); 3415 len1 = strlen(path1); 3416 if (strncmp(path1, path2, len1)) 3417 return (path2); 3418 if (path2[len1] == '\0') 3419 return "/"; 3420 if (path2[len1] == '/') 3421 return (path2 + len1); 3422 return (path2); 3423 } 3424 3425 /* 3426 * Jail-related sysctls. 3427 */ 3428 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 3429 "Jails"); 3430 3431 static int 3432 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3433 { 3434 struct xprison *xp; 3435 struct prison *pr, *cpr; 3436 #ifdef INET 3437 struct in_addr *ip4 = NULL; 3438 int ip4s = 0; 3439 #endif 3440 #ifdef INET6 3441 struct in6_addr *ip6 = NULL; 3442 int ip6s = 0; 3443 #endif 3444 int descend, error; 3445 3446 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3447 pr = req->td->td_ucred->cr_prison; 3448 error = 0; 3449 sx_slock(&allprison_lock); 3450 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3451 #if defined(INET) || defined(INET6) 3452 again: 3453 #endif 3454 mtx_lock(&cpr->pr_mtx); 3455 #ifdef INET 3456 if (cpr->pr_ip4s > 0) { 3457 if (ip4s < cpr->pr_ip4s) { 3458 ip4s = cpr->pr_ip4s; 3459 mtx_unlock(&cpr->pr_mtx); 3460 ip4 = realloc(ip4, ip4s * 3461 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3462 goto again; 3463 } 3464 bcopy(cpr->pr_ip4, ip4, 3465 cpr->pr_ip4s * sizeof(struct in_addr)); 3466 } 3467 #endif 3468 #ifdef INET6 3469 if (cpr->pr_ip6s > 0) { 3470 if (ip6s < cpr->pr_ip6s) { 3471 ip6s = cpr->pr_ip6s; 3472 mtx_unlock(&cpr->pr_mtx); 3473 ip6 = realloc(ip6, ip6s * 3474 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 3475 goto again; 3476 } 3477 bcopy(cpr->pr_ip6, ip6, 3478 cpr->pr_ip6s * sizeof(struct in6_addr)); 3479 } 3480 #endif 3481 if (cpr->pr_ref == 0) { 3482 mtx_unlock(&cpr->pr_mtx); 3483 continue; 3484 } 3485 bzero(xp, sizeof(*xp)); 3486 xp->pr_version = XPRISON_VERSION; 3487 xp->pr_id = cpr->pr_id; 3488 xp->pr_state = cpr->pr_uref > 0 3489 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 3490 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 3491 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 3492 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 3493 #ifdef INET 3494 xp->pr_ip4s = cpr->pr_ip4s; 3495 #endif 3496 #ifdef INET6 3497 xp->pr_ip6s = cpr->pr_ip6s; 3498 #endif 3499 mtx_unlock(&cpr->pr_mtx); 3500 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 3501 if (error) 3502 break; 3503 #ifdef INET 3504 if (xp->pr_ip4s > 0) { 3505 error = SYSCTL_OUT(req, ip4, 3506 xp->pr_ip4s * sizeof(struct in_addr)); 3507 if (error) 3508 break; 3509 } 3510 #endif 3511 #ifdef INET6 3512 if (xp->pr_ip6s > 0) { 3513 error = SYSCTL_OUT(req, ip6, 3514 xp->pr_ip6s * sizeof(struct in6_addr)); 3515 if (error) 3516 break; 3517 } 3518 #endif 3519 } 3520 sx_sunlock(&allprison_lock); 3521 free(xp, M_TEMP); 3522 #ifdef INET 3523 free(ip4, M_TEMP); 3524 #endif 3525 #ifdef INET6 3526 free(ip6, M_TEMP); 3527 #endif 3528 return (error); 3529 } 3530 3531 SYSCTL_OID(_security_jail, OID_AUTO, list, 3532 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3533 sysctl_jail_list, "S", "List of active jails"); 3534 3535 static int 3536 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 3537 { 3538 int error, injail; 3539 3540 injail = jailed(req->td->td_ucred); 3541 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 3542 3543 return (error); 3544 } 3545 3546 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 3547 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3548 sysctl_jail_jailed, "I", "Process in jail?"); 3549 3550 static int 3551 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 3552 { 3553 int error, havevnet; 3554 #ifdef VIMAGE 3555 struct ucred *cred = req->td->td_ucred; 3556 3557 havevnet = jailed(cred) && prison_owns_vnet(cred); 3558 #else 3559 havevnet = 0; 3560 #endif 3561 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 3562 3563 return (error); 3564 } 3565 3566 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 3567 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3568 sysctl_jail_vnet, "I", "Jail owns vnet?"); 3569 3570 #if defined(INET) || defined(INET6) 3571 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 3572 &jail_max_af_ips, 0, 3573 "Number of IP addresses a jail may have at most per address family (deprecated)"); 3574 #endif 3575 3576 /* 3577 * Default parameters for jail(2) compatibility. For historical reasons, 3578 * the sysctl names have varying similarity to the parameter names. Prisons 3579 * just see their own parameters, and can't change them. 3580 */ 3581 static int 3582 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 3583 { 3584 struct prison *pr; 3585 int allow, error, i; 3586 3587 pr = req->td->td_ucred->cr_prison; 3588 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 3589 3590 /* Get the current flag value, and convert it to a boolean. */ 3591 i = (allow & arg2) ? 1 : 0; 3592 if (arg1 != NULL) 3593 i = !i; 3594 error = sysctl_handle_int(oidp, &i, 0, req); 3595 if (error || !req->newptr) 3596 return (error); 3597 i = i ? arg2 : 0; 3598 if (arg1 != NULL) 3599 i ^= arg2; 3600 /* 3601 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 3602 * for writing. 3603 */ 3604 mtx_lock(&prison0.pr_mtx); 3605 jail_default_allow = (jail_default_allow & ~arg2) | i; 3606 mtx_unlock(&prison0.pr_mtx); 3607 return (0); 3608 } 3609 3610 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 3611 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3612 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 3613 "Processes in jail can set their hostnames (deprecated)"); 3614 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 3615 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3616 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 3617 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 3618 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 3619 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3620 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 3621 "Processes in jail can use System V IPC primitives (deprecated)"); 3622 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 3623 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3624 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 3625 "Prison root can create raw sockets (deprecated)"); 3626 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 3627 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3628 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 3629 "Processes in jail can alter system file flags (deprecated)"); 3630 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 3631 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3632 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 3633 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 3634 3635 static int 3636 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 3637 { 3638 struct prison *pr; 3639 int level, error; 3640 3641 pr = req->td->td_ucred->cr_prison; 3642 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 3643 error = sysctl_handle_int(oidp, &level, 0, req); 3644 if (error || !req->newptr) 3645 return (error); 3646 *(int *)arg1 = level; 3647 return (0); 3648 } 3649 3650 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 3651 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3652 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 3653 sysctl_jail_default_level, "I", 3654 "Processes in jail cannot see all mounted file systems (deprecated)"); 3655 3656 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 3657 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 3658 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 3659 sysctl_jail_default_level, "I", 3660 "Ruleset for the devfs filesystem in jail (deprecated)"); 3661 3662 /* 3663 * Nodes to describe jail parameters. Maximum length of string parameters 3664 * is returned in the string itself, and the other parameters exist merely 3665 * to make themselves and their types known. 3666 */ 3667 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 3668 "Jail parameters"); 3669 3670 int 3671 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 3672 { 3673 int i; 3674 long l; 3675 size_t s; 3676 char numbuf[12]; 3677 3678 switch (oidp->oid_kind & CTLTYPE) 3679 { 3680 case CTLTYPE_LONG: 3681 case CTLTYPE_ULONG: 3682 l = 0; 3683 #ifdef SCTL_MASK32 3684 if (!(req->flags & SCTL_MASK32)) 3685 #endif 3686 return (SYSCTL_OUT(req, &l, sizeof(l))); 3687 case CTLTYPE_INT: 3688 case CTLTYPE_UINT: 3689 i = 0; 3690 return (SYSCTL_OUT(req, &i, sizeof(i))); 3691 case CTLTYPE_STRING: 3692 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 3693 return 3694 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 3695 case CTLTYPE_STRUCT: 3696 s = (size_t)arg2; 3697 return (SYSCTL_OUT(req, &s, sizeof(s))); 3698 } 3699 return (0); 3700 } 3701 3702 /* 3703 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 3704 * jail creation time but cannot be changed in an existing jail. 3705 */ 3706 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 3707 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 3708 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 3709 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 3710 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 3711 "I", "Jail secure level"); 3712 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 3713 "Jail value for kern.osreldate and uname -K"); 3714 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 3715 "Jail value for kern.osrelease and uname -r"); 3716 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 3717 "I", "Jail cannot see all mounted file systems"); 3718 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 3719 "I", "Ruleset for in-jail devfs mounts"); 3720 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 3721 "B", "Jail persistence"); 3722 #ifdef VIMAGE 3723 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 3724 "E,jailsys", "Virtual network stack"); 3725 #endif 3726 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 3727 "B", "Jail is in the process of shutting down"); 3728 3729 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 3730 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 3731 "I", "Current number of child jails"); 3732 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 3733 "I", "Maximum number of child jails"); 3734 3735 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 3736 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 3737 "Jail hostname"); 3738 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 3739 "Jail NIS domainname"); 3740 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 3741 "Jail host UUID"); 3742 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 3743 "LU", "Jail host ID"); 3744 3745 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 3746 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 3747 3748 #ifdef INET 3749 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 3750 "Jail IPv4 address virtualization"); 3751 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 3752 "S,in_addr,a", "Jail IPv4 addresses"); 3753 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3754 "B", "Do (not) use IPv4 source address selection rather than the " 3755 "primary jail IPv4 address."); 3756 #endif 3757 #ifdef INET6 3758 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 3759 "Jail IPv6 address virtualization"); 3760 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 3761 "S,in6_addr,a", "Jail IPv6 addresses"); 3762 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3763 "B", "Do (not) use IPv6 source address selection rather than the " 3764 "primary jail IPv6 address."); 3765 #endif 3766 3767 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 3768 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 3769 "B", "Jail may set hostname"); 3770 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 3771 "B", "Jail may use SYSV IPC"); 3772 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 3773 "B", "Jail may create raw sockets"); 3774 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 3775 "B", "Jail may alter system file flags"); 3776 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 3777 "B", "Jail may set file quotas"); 3778 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 3779 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 3780 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW, 3781 "B", "Jail may lock (unlock) physical pages in memory"); 3782 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW, 3783 "B", "Jail may bind sockets to reserved ports"); 3784 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW, 3785 "B", "Jail may read the kernel message buffer"); 3786 SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW, 3787 "B", "Unprivileged processes may use process debugging facilities"); 3788 3789 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 3790 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 3791 "B", "Jail may mount/unmount jail-friendly file systems in general"); 3792 3793 /* 3794 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return 3795 * its associated bit in the pr_allow bitmask, or zero if the parameter was 3796 * not created. 3797 */ 3798 unsigned 3799 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr, 3800 const char *descr) 3801 { 3802 struct bool_flags *bf; 3803 struct sysctl_oid *parent; 3804 char *allow_name, *allow_noname, *allowed; 3805 #ifndef NO_SYSCTL_DESCR 3806 char *descr_deprecated; 3807 #endif 3808 unsigned allow_flag; 3809 3810 if (prefix 3811 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name) 3812 < 0 || 3813 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name) 3814 < 0 3815 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 || 3816 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) { 3817 free(allow_name, M_PRISON); 3818 return 0; 3819 } 3820 3821 /* 3822 * See if this parameter has already beed added, i.e. a module was 3823 * previously loaded/unloaded. 3824 */ 3825 mtx_lock(&prison0.pr_mtx); 3826 for (bf = pr_flag_allow; 3827 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 3828 bf++) { 3829 if (strcmp(bf->name, allow_name) == 0) { 3830 allow_flag = bf->flag; 3831 goto no_add; 3832 } 3833 } 3834 3835 /* 3836 * Find a free bit in prison0's pr_allow, failing if there are none 3837 * (which shouldn't happen as long as we keep track of how many 3838 * potential dynamic flags exist). 3839 * 3840 * Due to per-jail unprivileged process debugging support 3841 * using pr_allow, also verify against PR_ALLOW_ALL_STATIC. 3842 * prison0 may have unprivileged process debugging unset. 3843 */ 3844 for (allow_flag = 1;; allow_flag <<= 1) { 3845 if (allow_flag == 0) 3846 goto no_add; 3847 if (allow_flag & PR_ALLOW_ALL_STATIC) 3848 continue; 3849 if ((prison0.pr_allow & allow_flag) == 0) 3850 break; 3851 } 3852 3853 /* 3854 * Note the parameter in the next open slot in pr_flag_allow. 3855 * Set the flag last so code that checks pr_flag_allow can do so 3856 * without locking. 3857 */ 3858 for (bf = pr_flag_allow; bf->flag != 0; bf++) 3859 if (bf == pr_flag_allow + nitems(pr_flag_allow)) { 3860 /* This should never happen, but is not fatal. */ 3861 allow_flag = 0; 3862 goto no_add; 3863 } 3864 prison0.pr_allow |= allow_flag; 3865 bf->name = allow_name; 3866 bf->noname = allow_noname; 3867 bf->flag = allow_flag; 3868 mtx_unlock(&prison0.pr_mtx); 3869 3870 /* 3871 * Create sysctls for the paramter, and the back-compat global 3872 * permission. 3873 */ 3874 parent = prefix 3875 ? SYSCTL_ADD_NODE(NULL, 3876 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow), 3877 OID_AUTO, prefix, 0, 0, prefix_descr) 3878 : &sysctl___security_jail_param_allow; 3879 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO, 3880 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3881 NULL, 0, sysctl_jail_param, "B", descr); 3882 if ((prefix 3883 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name) 3884 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) { 3885 #ifndef NO_SYSCTL_DESCR 3886 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)", 3887 descr); 3888 #endif 3889 (void)SYSCTL_ADD_PROC(NULL, 3890 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed, 3891 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag, 3892 sysctl_jail_default_allow, "I", descr_deprecated); 3893 #ifndef NO_SYSCTL_DESCR 3894 free(descr_deprecated, M_TEMP); 3895 #endif 3896 free(allowed, M_TEMP); 3897 } 3898 return allow_flag; 3899 3900 no_add: 3901 mtx_unlock(&prison0.pr_mtx); 3902 free(allow_name, M_PRISON); 3903 free(allow_noname, M_PRISON); 3904 return allow_flag; 3905 } 3906 3907 /* 3908 * The VFS system will register jail-aware filesystems here. They each get 3909 * a parameter allow.mount.xxxfs and a flag to check when a jailed user 3910 * attempts to mount. 3911 */ 3912 void 3913 prison_add_vfs(struct vfsconf *vfsp) 3914 { 3915 #ifdef NO_SYSCTL_DESCR 3916 3917 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 3918 NULL, NULL); 3919 #else 3920 char *descr; 3921 3922 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system", 3923 vfsp->vfc_name); 3924 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 3925 NULL, descr); 3926 free(descr, M_TEMP); 3927 #endif 3928 } 3929 3930 #ifdef RACCT 3931 void 3932 prison_racct_foreach(void (*callback)(struct racct *racct, 3933 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 3934 void *arg2, void *arg3) 3935 { 3936 struct prison_racct *prr; 3937 3938 ASSERT_RACCT_ENABLED(); 3939 3940 sx_slock(&allprison_lock); 3941 if (pre != NULL) 3942 (pre)(); 3943 LIST_FOREACH(prr, &allprison_racct, prr_next) 3944 (callback)(prr->prr_racct, arg2, arg3); 3945 if (post != NULL) 3946 (post)(); 3947 sx_sunlock(&allprison_lock); 3948 } 3949 3950 static struct prison_racct * 3951 prison_racct_find_locked(const char *name) 3952 { 3953 struct prison_racct *prr; 3954 3955 ASSERT_RACCT_ENABLED(); 3956 sx_assert(&allprison_lock, SA_XLOCKED); 3957 3958 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 3959 return (NULL); 3960 3961 LIST_FOREACH(prr, &allprison_racct, prr_next) { 3962 if (strcmp(name, prr->prr_name) != 0) 3963 continue; 3964 3965 /* Found prison_racct with a matching name? */ 3966 prison_racct_hold(prr); 3967 return (prr); 3968 } 3969 3970 /* Add new prison_racct. */ 3971 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 3972 racct_create(&prr->prr_racct); 3973 3974 strcpy(prr->prr_name, name); 3975 refcount_init(&prr->prr_refcount, 1); 3976 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 3977 3978 return (prr); 3979 } 3980 3981 struct prison_racct * 3982 prison_racct_find(const char *name) 3983 { 3984 struct prison_racct *prr; 3985 3986 ASSERT_RACCT_ENABLED(); 3987 3988 sx_xlock(&allprison_lock); 3989 prr = prison_racct_find_locked(name); 3990 sx_xunlock(&allprison_lock); 3991 return (prr); 3992 } 3993 3994 void 3995 prison_racct_hold(struct prison_racct *prr) 3996 { 3997 3998 ASSERT_RACCT_ENABLED(); 3999 4000 refcount_acquire(&prr->prr_refcount); 4001 } 4002 4003 static void 4004 prison_racct_free_locked(struct prison_racct *prr) 4005 { 4006 4007 ASSERT_RACCT_ENABLED(); 4008 sx_assert(&allprison_lock, SA_XLOCKED); 4009 4010 if (refcount_release(&prr->prr_refcount)) { 4011 racct_destroy(&prr->prr_racct); 4012 LIST_REMOVE(prr, prr_next); 4013 free(prr, M_PRISON_RACCT); 4014 } 4015 } 4016 4017 void 4018 prison_racct_free(struct prison_racct *prr) 4019 { 4020 4021 ASSERT_RACCT_ENABLED(); 4022 sx_assert(&allprison_lock, SA_UNLOCKED); 4023 4024 if (refcount_release_if_not_last(&prr->prr_refcount)) 4025 return; 4026 4027 sx_xlock(&allprison_lock); 4028 prison_racct_free_locked(prr); 4029 sx_xunlock(&allprison_lock); 4030 } 4031 4032 static void 4033 prison_racct_attach(struct prison *pr) 4034 { 4035 struct prison_racct *prr; 4036 4037 ASSERT_RACCT_ENABLED(); 4038 sx_assert(&allprison_lock, SA_XLOCKED); 4039 4040 prr = prison_racct_find_locked(pr->pr_name); 4041 KASSERT(prr != NULL, ("cannot find prison_racct")); 4042 4043 pr->pr_prison_racct = prr; 4044 } 4045 4046 /* 4047 * Handle jail renaming. From the racct point of view, renaming means 4048 * moving from one prison_racct to another. 4049 */ 4050 static void 4051 prison_racct_modify(struct prison *pr) 4052 { 4053 #ifdef RCTL 4054 struct proc *p; 4055 struct ucred *cred; 4056 #endif 4057 struct prison_racct *oldprr; 4058 4059 ASSERT_RACCT_ENABLED(); 4060 4061 sx_slock(&allproc_lock); 4062 sx_xlock(&allprison_lock); 4063 4064 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4065 sx_xunlock(&allprison_lock); 4066 sx_sunlock(&allproc_lock); 4067 return; 4068 } 4069 4070 oldprr = pr->pr_prison_racct; 4071 pr->pr_prison_racct = NULL; 4072 4073 prison_racct_attach(pr); 4074 4075 /* 4076 * Move resource utilisation records. 4077 */ 4078 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4079 4080 #ifdef RCTL 4081 /* 4082 * Force rctl to reattach rules to processes. 4083 */ 4084 FOREACH_PROC_IN_SYSTEM(p) { 4085 PROC_LOCK(p); 4086 cred = crhold(p->p_ucred); 4087 PROC_UNLOCK(p); 4088 rctl_proc_ucred_changed(p, cred); 4089 crfree(cred); 4090 } 4091 #endif 4092 4093 sx_sunlock(&allproc_lock); 4094 prison_racct_free_locked(oldprr); 4095 sx_xunlock(&allprison_lock); 4096 } 4097 4098 static void 4099 prison_racct_detach(struct prison *pr) 4100 { 4101 4102 ASSERT_RACCT_ENABLED(); 4103 sx_assert(&allprison_lock, SA_UNLOCKED); 4104 4105 if (pr->pr_prison_racct == NULL) 4106 return; 4107 prison_racct_free(pr->pr_prison_racct); 4108 pr->pr_prison_racct = NULL; 4109 } 4110 #endif /* RACCT */ 4111 4112 #ifdef DDB 4113 4114 static void 4115 db_show_prison(struct prison *pr) 4116 { 4117 struct bool_flags *bf; 4118 struct jailsys_flags *jsf; 4119 #if defined(INET) || defined(INET6) 4120 int ii; 4121 #endif 4122 unsigned f; 4123 #ifdef INET 4124 char ip4buf[INET_ADDRSTRLEN]; 4125 #endif 4126 #ifdef INET6 4127 char ip6buf[INET6_ADDRSTRLEN]; 4128 #endif 4129 4130 db_printf("prison %p:\n", pr); 4131 db_printf(" jid = %d\n", pr->pr_id); 4132 db_printf(" name = %s\n", pr->pr_name); 4133 db_printf(" parent = %p\n", pr->pr_parent); 4134 db_printf(" ref = %d\n", pr->pr_ref); 4135 db_printf(" uref = %d\n", pr->pr_uref); 4136 db_printf(" path = %s\n", pr->pr_path); 4137 db_printf(" cpuset = %d\n", pr->pr_cpuset 4138 ? pr->pr_cpuset->cs_id : -1); 4139 #ifdef VIMAGE 4140 db_printf(" vnet = %p\n", pr->pr_vnet); 4141 #endif 4142 db_printf(" root = %p\n", pr->pr_root); 4143 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4144 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4145 db_printf(" children.max = %d\n", pr->pr_childmax); 4146 db_printf(" children.cur = %d\n", pr->pr_childcount); 4147 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4148 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4149 db_printf(" flags = 0x%x", pr->pr_flags); 4150 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++) 4151 if (pr->pr_flags & bf->flag) 4152 db_printf(" %s", bf->name); 4153 for (jsf = pr_flag_jailsys; 4154 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 4155 jsf++) { 4156 f = pr->pr_flags & (jsf->disable | jsf->new); 4157 db_printf(" %-16s= %s\n", jsf->name, 4158 (f != 0 && f == jsf->disable) ? "disable" 4159 : (f == jsf->new) ? "new" 4160 : "inherit"); 4161 } 4162 db_printf(" allow = 0x%x", pr->pr_allow); 4163 for (bf = pr_flag_allow; 4164 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 4165 bf++) 4166 if (pr->pr_allow & bf->flag) 4167 db_printf(" %s", bf->name); 4168 db_printf("\n"); 4169 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4170 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4171 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4172 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4173 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4174 #ifdef INET 4175 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4176 for (ii = 0; ii < pr->pr_ip4s; ii++) 4177 db_printf(" %s %s\n", 4178 ii == 0 ? "ip4.addr =" : " ", 4179 inet_ntoa_r(pr->pr_ip4[ii], ip4buf)); 4180 #endif 4181 #ifdef INET6 4182 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4183 for (ii = 0; ii < pr->pr_ip6s; ii++) 4184 db_printf(" %s %s\n", 4185 ii == 0 ? "ip6.addr =" : " ", 4186 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4187 #endif 4188 } 4189 4190 DB_SHOW_COMMAND(prison, db_show_prison_command) 4191 { 4192 struct prison *pr; 4193 4194 if (!have_addr) { 4195 /* 4196 * Show all prisons in the list, and prison0 which is not 4197 * listed. 4198 */ 4199 db_show_prison(&prison0); 4200 if (!db_pager_quit) { 4201 TAILQ_FOREACH(pr, &allprison, pr_list) { 4202 db_show_prison(pr); 4203 if (db_pager_quit) 4204 break; 4205 } 4206 } 4207 return; 4208 } 4209 4210 if (addr == 0) 4211 pr = &prison0; 4212 else { 4213 /* Look for a prison with the ID and with references. */ 4214 TAILQ_FOREACH(pr, &allprison, pr_list) 4215 if (pr->pr_id == addr && pr->pr_ref > 0) 4216 break; 4217 if (pr == NULL) 4218 /* Look again, without requiring a reference. */ 4219 TAILQ_FOREACH(pr, &allprison, pr_list) 4220 if (pr->pr_id == addr) 4221 break; 4222 if (pr == NULL) 4223 /* Assume address points to a valid prison. */ 4224 pr = (struct prison *)addr; 4225 } 4226 db_show_prison(pr); 4227 } 4228 4229 #endif /* DDB */ 4230