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