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