Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_jail.c
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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: releng/12.0/sys/kern/kern_jail.c 340628 2018-11-19 14:19:27Z kib $"); 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 = "", 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 }; 198 const size_t pr_flag_allow_size = sizeof(pr_flag_allow); 199 200 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | PR_ALLOW_RESERVED_PORTS) 201 #define JAIL_DEFAULT_ENFORCE_STATFS 2 202 #define JAIL_DEFAULT_DEVFS_RSNUM 0 203 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 204 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 205 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 206 #if defined(INET) || defined(INET6) 207 static unsigned jail_max_af_ips = 255; 208 #endif 209 210 /* 211 * Initialize the parts of prison0 that can't be static-initialized with 212 * constants. This is called from proc0_init() after creating thread0 cpuset. 213 */ 214 void 215 prison0_init(void) 216 { 217 218 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 219 prison0.pr_osreldate = osreldate; 220 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 221 } 222 223 /* 224 * struct jail_args { 225 * struct jail *jail; 226 * }; 227 */ 228 int 229 sys_jail(struct thread *td, struct jail_args *uap) 230 { 231 uint32_t version; 232 int error; 233 struct jail j; 234 235 error = copyin(uap->jail, &version, sizeof(uint32_t)); 236 if (error) 237 return (error); 238 239 switch (version) { 240 case 0: 241 { 242 struct jail_v0 j0; 243 244 /* FreeBSD single IPv4 jails. */ 245 bzero(&j, sizeof(struct jail)); 246 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 247 if (error) 248 return (error); 249 j.version = j0.version; 250 j.path = j0.path; 251 j.hostname = j0.hostname; 252 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 253 break; 254 } 255 256 case 1: 257 /* 258 * Version 1 was used by multi-IPv4 jail implementations 259 * that never made it into the official kernel. 260 */ 261 return (EINVAL); 262 263 case 2: /* JAIL_API_VERSION */ 264 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 265 error = copyin(uap->jail, &j, sizeof(struct jail)); 266 if (error) 267 return (error); 268 break; 269 270 default: 271 /* Sci-Fi jails are not supported, sorry. */ 272 return (EINVAL); 273 } 274 return (kern_jail(td, &j)); 275 } 276 277 int 278 kern_jail(struct thread *td, struct jail *j) 279 { 280 struct iovec optiov[2 * (4 + nitems(pr_flag_allow) 281 #ifdef INET 282 + 1 283 #endif 284 #ifdef INET6 285 + 1 286 #endif 287 )]; 288 struct uio opt; 289 char *u_path, *u_hostname, *u_name; 290 struct bool_flags *bf; 291 #ifdef INET 292 uint32_t ip4s; 293 struct in_addr *u_ip4; 294 #endif 295 #ifdef INET6 296 struct in6_addr *u_ip6; 297 #endif 298 size_t tmplen; 299 int error, enforce_statfs; 300 301 bzero(&optiov, sizeof(optiov)); 302 opt.uio_iov = optiov; 303 opt.uio_iovcnt = 0; 304 opt.uio_offset = -1; 305 opt.uio_resid = -1; 306 opt.uio_segflg = UIO_SYSSPACE; 307 opt.uio_rw = UIO_READ; 308 opt.uio_td = td; 309 310 /* Set permissions for top-level jails from sysctls. */ 311 if (!jailed(td->td_ucred)) { 312 for (bf = pr_flag_allow; 313 bf < pr_flag_allow + nitems(pr_flag_allow) && 314 bf->flag != 0; 315 bf++) { 316 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *, 317 (jail_default_allow & bf->flag) 318 ? bf->name : bf->noname); 319 optiov[opt.uio_iovcnt].iov_len = 320 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 321 opt.uio_iovcnt += 2; 322 } 323 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 324 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 325 opt.uio_iovcnt++; 326 enforce_statfs = jail_default_enforce_statfs; 327 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 328 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 329 opt.uio_iovcnt++; 330 } 331 332 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 333 #ifdef INET 334 ip4s = (j->version == 0) ? 1 : j->ip4s; 335 if (ip4s > jail_max_af_ips) 336 return (EINVAL); 337 tmplen += ip4s * sizeof(struct in_addr); 338 #else 339 if (j->ip4s > 0) 340 return (EINVAL); 341 #endif 342 #ifdef INET6 343 if (j->ip6s > jail_max_af_ips) 344 return (EINVAL); 345 tmplen += j->ip6s * sizeof(struct in6_addr); 346 #else 347 if (j->ip6s > 0) 348 return (EINVAL); 349 #endif 350 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 351 u_hostname = u_path + MAXPATHLEN; 352 u_name = u_hostname + MAXHOSTNAMELEN; 353 #ifdef INET 354 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 355 #endif 356 #ifdef INET6 357 #ifdef INET 358 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 359 #else 360 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 361 #endif 362 #endif 363 optiov[opt.uio_iovcnt].iov_base = "path"; 364 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 365 opt.uio_iovcnt++; 366 optiov[opt.uio_iovcnt].iov_base = u_path; 367 error = copyinstr(j->path, u_path, MAXPATHLEN, 368 &optiov[opt.uio_iovcnt].iov_len); 369 if (error) { 370 free(u_path, M_TEMP); 371 return (error); 372 } 373 opt.uio_iovcnt++; 374 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 375 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 376 opt.uio_iovcnt++; 377 optiov[opt.uio_iovcnt].iov_base = u_hostname; 378 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 379 &optiov[opt.uio_iovcnt].iov_len); 380 if (error) { 381 free(u_path, M_TEMP); 382 return (error); 383 } 384 opt.uio_iovcnt++; 385 if (j->jailname != NULL) { 386 optiov[opt.uio_iovcnt].iov_base = "name"; 387 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 388 opt.uio_iovcnt++; 389 optiov[opt.uio_iovcnt].iov_base = u_name; 390 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 391 &optiov[opt.uio_iovcnt].iov_len); 392 if (error) { 393 free(u_path, M_TEMP); 394 return (error); 395 } 396 opt.uio_iovcnt++; 397 } 398 #ifdef INET 399 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 400 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 401 opt.uio_iovcnt++; 402 optiov[opt.uio_iovcnt].iov_base = u_ip4; 403 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 404 if (j->version == 0) 405 u_ip4->s_addr = j->ip4s; 406 else { 407 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 408 if (error) { 409 free(u_path, M_TEMP); 410 return (error); 411 } 412 } 413 opt.uio_iovcnt++; 414 #endif 415 #ifdef INET6 416 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 417 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 418 opt.uio_iovcnt++; 419 optiov[opt.uio_iovcnt].iov_base = u_ip6; 420 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 421 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 422 if (error) { 423 free(u_path, M_TEMP); 424 return (error); 425 } 426 opt.uio_iovcnt++; 427 #endif 428 KASSERT(opt.uio_iovcnt <= nitems(optiov), 429 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 430 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 431 free(u_path, M_TEMP); 432 return (error); 433 } 434 435 436 /* 437 * struct jail_set_args { 438 * struct iovec *iovp; 439 * unsigned int iovcnt; 440 * int flags; 441 * }; 442 */ 443 int 444 sys_jail_set(struct thread *td, struct jail_set_args *uap) 445 { 446 struct uio *auio; 447 int error; 448 449 /* Check that we have an even number of iovecs. */ 450 if (uap->iovcnt & 1) 451 return (EINVAL); 452 453 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 454 if (error) 455 return (error); 456 error = kern_jail_set(td, auio, uap->flags); 457 free(auio, M_IOV); 458 return (error); 459 } 460 461 int 462 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 463 { 464 struct nameidata nd; 465 #ifdef INET 466 struct in_addr *ip4; 467 #endif 468 #ifdef INET6 469 struct in6_addr *ip6; 470 #endif 471 struct vfsopt *opt; 472 struct vfsoptlist *opts; 473 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 474 struct vnode *root; 475 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 476 char *g_path, *osrelstr; 477 struct bool_flags *bf; 478 struct jailsys_flags *jsf; 479 #if defined(INET) || defined(INET6) 480 struct prison *tppr; 481 void *op; 482 #endif 483 unsigned long hid; 484 size_t namelen, onamelen, pnamelen; 485 int born, created, cuflags, descend, enforce; 486 int error, errmsg_len, errmsg_pos; 487 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 488 int jid, jsys, len, level; 489 int childmax, osreldt, rsnum, slevel; 490 int fullpath_disabled; 491 #if defined(INET) || defined(INET6) 492 int ii, ij; 493 #endif 494 #ifdef INET 495 int ip4s, redo_ip4; 496 #endif 497 #ifdef INET6 498 int ip6s, redo_ip6; 499 #endif 500 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 501 unsigned tallow; 502 char numbuf[12]; 503 504 error = priv_check(td, PRIV_JAIL_SET); 505 if (!error && (flags & JAIL_ATTACH)) 506 error = priv_check(td, PRIV_JAIL_ATTACH); 507 if (error) 508 return (error); 509 mypr = td->td_ucred->cr_prison; 510 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 511 return (EPERM); 512 if (flags & ~JAIL_SET_MASK) 513 return (EINVAL); 514 515 /* 516 * Check all the parameters before committing to anything. Not all 517 * errors can be caught early, but we may as well try. Also, this 518 * takes care of some expensive stuff (path lookup) before getting 519 * the allprison lock. 520 * 521 * XXX Jails are not filesystems, and jail parameters are not mount 522 * options. But it makes more sense to re-use the vfsopt code 523 * than duplicate it under a different name. 524 */ 525 error = vfs_buildopts(optuio, &opts); 526 if (error) 527 return (error); 528 #ifdef INET 529 ip4 = NULL; 530 #endif 531 #ifdef INET6 532 ip6 = NULL; 533 #endif 534 g_path = NULL; 535 536 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 537 if (!cuflags) { 538 error = EINVAL; 539 vfs_opterror(opts, "no valid operation (create or update)"); 540 goto done_errmsg; 541 } 542 543 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 544 if (error == ENOENT) 545 jid = 0; 546 else if (error != 0) 547 goto done_free; 548 549 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 550 if (error == ENOENT) 551 gotslevel = 0; 552 else if (error != 0) 553 goto done_free; 554 else 555 gotslevel = 1; 556 557 error = 558 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 559 if (error == ENOENT) 560 gotchildmax = 0; 561 else if (error != 0) 562 goto done_free; 563 else 564 gotchildmax = 1; 565 566 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 567 if (error == ENOENT) 568 gotenforce = 0; 569 else if (error != 0) 570 goto done_free; 571 else if (enforce < 0 || enforce > 2) { 572 error = EINVAL; 573 goto done_free; 574 } else 575 gotenforce = 1; 576 577 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 578 if (error == ENOENT) 579 gotrsnum = 0; 580 else if (error != 0) 581 goto done_free; 582 else 583 gotrsnum = 1; 584 585 pr_flags = ch_flags = 0; 586 for (bf = pr_flag_bool; 587 bf < pr_flag_bool + nitems(pr_flag_bool); 588 bf++) { 589 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag); 590 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag); 591 } 592 ch_flags |= pr_flags; 593 for (jsf = pr_flag_jailsys; 594 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 595 jsf++) { 596 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys)); 597 if (error == ENOENT) 598 continue; 599 if (error != 0) 600 goto done_free; 601 switch (jsys) { 602 case JAIL_SYS_DISABLE: 603 if (!jsf->disable) { 604 error = EINVAL; 605 goto done_free; 606 } 607 pr_flags |= jsf->disable; 608 break; 609 case JAIL_SYS_NEW: 610 pr_flags |= jsf->new; 611 break; 612 case JAIL_SYS_INHERIT: 613 break; 614 default: 615 error = EINVAL; 616 goto done_free; 617 } 618 ch_flags |= jsf->new | jsf->disable; 619 } 620 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 621 && !(pr_flags & PR_PERSIST)) { 622 error = EINVAL; 623 vfs_opterror(opts, "new jail must persist or attach"); 624 goto done_errmsg; 625 } 626 #ifdef VIMAGE 627 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 628 error = EINVAL; 629 vfs_opterror(opts, "vnet cannot be changed after creation"); 630 goto done_errmsg; 631 } 632 #endif 633 #ifdef INET 634 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 635 error = EINVAL; 636 vfs_opterror(opts, "ip4 cannot be changed after creation"); 637 goto done_errmsg; 638 } 639 #endif 640 #ifdef INET6 641 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 642 error = EINVAL; 643 vfs_opterror(opts, "ip6 cannot be changed after creation"); 644 goto done_errmsg; 645 } 646 #endif 647 648 pr_allow = ch_allow = 0; 649 for (bf = pr_flag_allow; 650 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 651 bf++) { 652 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag); 653 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag); 654 } 655 ch_allow |= pr_allow; 656 657 error = vfs_getopt(opts, "name", (void **)&name, &len); 658 if (error == ENOENT) 659 name = NULL; 660 else if (error != 0) 661 goto done_free; 662 else { 663 if (len == 0 || name[len - 1] != '\0') { 664 error = EINVAL; 665 goto done_free; 666 } 667 if (len > MAXHOSTNAMELEN) { 668 error = ENAMETOOLONG; 669 goto done_free; 670 } 671 } 672 673 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 674 if (error == ENOENT) 675 host = NULL; 676 else if (error != 0) 677 goto done_free; 678 else { 679 ch_flags |= PR_HOST; 680 pr_flags |= PR_HOST; 681 if (len == 0 || host[len - 1] != '\0') { 682 error = EINVAL; 683 goto done_free; 684 } 685 if (len > MAXHOSTNAMELEN) { 686 error = ENAMETOOLONG; 687 goto done_free; 688 } 689 } 690 691 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 692 if (error == ENOENT) 693 domain = NULL; 694 else if (error != 0) 695 goto done_free; 696 else { 697 ch_flags |= PR_HOST; 698 pr_flags |= PR_HOST; 699 if (len == 0 || domain[len - 1] != '\0') { 700 error = EINVAL; 701 goto done_free; 702 } 703 if (len > MAXHOSTNAMELEN) { 704 error = ENAMETOOLONG; 705 goto done_free; 706 } 707 } 708 709 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 710 if (error == ENOENT) 711 uuid = NULL; 712 else if (error != 0) 713 goto done_free; 714 else { 715 ch_flags |= PR_HOST; 716 pr_flags |= PR_HOST; 717 if (len == 0 || uuid[len - 1] != '\0') { 718 error = EINVAL; 719 goto done_free; 720 } 721 if (len > HOSTUUIDLEN) { 722 error = ENAMETOOLONG; 723 goto done_free; 724 } 725 } 726 727 #ifdef COMPAT_FREEBSD32 728 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 729 uint32_t hid32; 730 731 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 732 hid = hid32; 733 } else 734 #endif 735 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 736 if (error == ENOENT) 737 gothid = 0; 738 else if (error != 0) 739 goto done_free; 740 else { 741 gothid = 1; 742 ch_flags |= PR_HOST; 743 pr_flags |= PR_HOST; 744 } 745 746 #ifdef INET 747 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 748 if (error == ENOENT) 749 ip4s = 0; 750 else if (error != 0) 751 goto done_free; 752 else if (ip4s & (sizeof(*ip4) - 1)) { 753 error = EINVAL; 754 goto done_free; 755 } else { 756 ch_flags |= PR_IP4_USER; 757 pr_flags |= PR_IP4_USER; 758 if (ip4s > 0) { 759 ip4s /= sizeof(*ip4); 760 if (ip4s > jail_max_af_ips) { 761 error = EINVAL; 762 vfs_opterror(opts, "too many IPv4 addresses"); 763 goto done_errmsg; 764 } 765 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 766 bcopy(op, ip4, ip4s * sizeof(*ip4)); 767 /* 768 * IP addresses are all sorted but ip[0] to preserve 769 * the primary IP address as given from userland. 770 * This special IP is used for unbound outgoing 771 * connections as well for "loopback" traffic in case 772 * source address selection cannot find any more fitting 773 * address to connect from. 774 */ 775 if (ip4s > 1) 776 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), 777 prison_qcmp_v4); 778 /* 779 * Check for duplicate addresses and do some simple 780 * zero and broadcast checks. If users give other bogus 781 * addresses it is their problem. 782 * 783 * We do not have to care about byte order for these 784 * checks so we will do them in NBO. 785 */ 786 for (ii = 0; ii < ip4s; ii++) { 787 if (ip4[ii].s_addr == INADDR_ANY || 788 ip4[ii].s_addr == INADDR_BROADCAST) { 789 error = EINVAL; 790 goto done_free; 791 } 792 if ((ii+1) < ip4s && 793 (ip4[0].s_addr == ip4[ii+1].s_addr || 794 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 795 error = EINVAL; 796 goto done_free; 797 } 798 } 799 } 800 } 801 #endif 802 803 #ifdef INET6 804 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 805 if (error == ENOENT) 806 ip6s = 0; 807 else if (error != 0) 808 goto done_free; 809 else if (ip6s & (sizeof(*ip6) - 1)) { 810 error = EINVAL; 811 goto done_free; 812 } else { 813 ch_flags |= PR_IP6_USER; 814 pr_flags |= PR_IP6_USER; 815 if (ip6s > 0) { 816 ip6s /= sizeof(*ip6); 817 if (ip6s > jail_max_af_ips) { 818 error = EINVAL; 819 vfs_opterror(opts, "too many IPv6 addresses"); 820 goto done_errmsg; 821 } 822 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 823 bcopy(op, ip6, ip6s * sizeof(*ip6)); 824 if (ip6s > 1) 825 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), 826 prison_qcmp_v6); 827 for (ii = 0; ii < ip6s; ii++) { 828 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 829 error = EINVAL; 830 goto done_free; 831 } 832 if ((ii+1) < ip6s && 833 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 834 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 835 { 836 error = EINVAL; 837 goto done_free; 838 } 839 } 840 } 841 } 842 #endif 843 844 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 845 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 846 error = EINVAL; 847 vfs_opterror(opts, 848 "vnet jails cannot have IP address restrictions"); 849 goto done_errmsg; 850 } 851 #endif 852 853 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 854 if (error == ENOENT) 855 osrelstr = NULL; 856 else if (error != 0) 857 goto done_free; 858 else { 859 if (flags & JAIL_UPDATE) { 860 error = EINVAL; 861 vfs_opterror(opts, 862 "osrelease cannot be changed after creation"); 863 goto done_errmsg; 864 } 865 if (len == 0 || len >= OSRELEASELEN) { 866 error = EINVAL; 867 vfs_opterror(opts, 868 "osrelease string must be 1-%d bytes long", 869 OSRELEASELEN - 1); 870 goto done_errmsg; 871 } 872 } 873 874 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 875 if (error == ENOENT) 876 osreldt = 0; 877 else if (error != 0) 878 goto done_free; 879 else { 880 if (flags & JAIL_UPDATE) { 881 error = EINVAL; 882 vfs_opterror(opts, 883 "osreldate cannot be changed after creation"); 884 goto done_errmsg; 885 } 886 if (osreldt == 0) { 887 error = EINVAL; 888 vfs_opterror(opts, "osreldate cannot be 0"); 889 goto done_errmsg; 890 } 891 } 892 893 fullpath_disabled = 0; 894 root = NULL; 895 error = vfs_getopt(opts, "path", (void **)&path, &len); 896 if (error == ENOENT) 897 path = NULL; 898 else if (error != 0) 899 goto done_free; 900 else { 901 if (flags & JAIL_UPDATE) { 902 error = EINVAL; 903 vfs_opterror(opts, 904 "path cannot be changed after creation"); 905 goto done_errmsg; 906 } 907 if (len == 0 || path[len - 1] != '\0') { 908 error = EINVAL; 909 goto done_free; 910 } 911 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 912 path, td); 913 error = namei(&nd); 914 if (error) 915 goto done_free; 916 root = nd.ni_vp; 917 NDFREE(&nd, NDF_ONLY_PNBUF); 918 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 919 strlcpy(g_path, path, MAXPATHLEN); 920 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 921 if (error == 0) 922 path = g_path; 923 else if (error == ENODEV) { 924 /* proceed if sysctl debug.disablefullpath == 1 */ 925 fullpath_disabled = 1; 926 if (len < 2 || (len == 2 && path[0] == '/')) 927 path = NULL; 928 } else { 929 /* exit on other errors */ 930 goto done_free; 931 } 932 if (root->v_type != VDIR) { 933 error = ENOTDIR; 934 vput(root); 935 goto done_free; 936 } 937 VOP_UNLOCK(root, 0); 938 if (fullpath_disabled) { 939 /* Leave room for a real-root full pathname. */ 940 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 941 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 942 error = ENAMETOOLONG; 943 vrele(root); 944 goto done_free; 945 } 946 } 947 } 948 949 /* 950 * Find the specified jail, or at least its parent. 951 * This abuses the file error codes ENOENT and EEXIST. 952 */ 953 pr = NULL; 954 ppr = mypr; 955 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 956 namelc = strrchr(name, '.'); 957 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 958 if (*p != '\0') 959 jid = 0; 960 } 961 sx_xlock(&allprison_lock); 962 if (jid != 0) { 963 /* 964 * See if a requested jid already exists. There is an 965 * information leak here if the jid exists but is not within 966 * the caller's jail hierarchy. Jail creators will get EEXIST 967 * even though they cannot see the jail, and CREATE | UPDATE 968 * will return ENOENT which is not normally a valid error. 969 */ 970 if (jid < 0) { 971 error = EINVAL; 972 vfs_opterror(opts, "negative jid"); 973 goto done_unlock_list; 974 } 975 pr = prison_find(jid); 976 if (pr != NULL) { 977 ppr = pr->pr_parent; 978 /* Create: jid must not exist. */ 979 if (cuflags == JAIL_CREATE) { 980 mtx_unlock(&pr->pr_mtx); 981 error = EEXIST; 982 vfs_opterror(opts, "jail %d already exists", 983 jid); 984 goto done_unlock_list; 985 } 986 if (!prison_ischild(mypr, pr)) { 987 mtx_unlock(&pr->pr_mtx); 988 pr = NULL; 989 } else if (pr->pr_uref == 0) { 990 if (!(flags & JAIL_DYING)) { 991 mtx_unlock(&pr->pr_mtx); 992 error = ENOENT; 993 vfs_opterror(opts, "jail %d is dying", 994 jid); 995 goto done_unlock_list; 996 } else if ((flags & JAIL_ATTACH) || 997 (pr_flags & PR_PERSIST)) { 998 /* 999 * A dying jail might be resurrected 1000 * (via attach or persist), but first 1001 * it must determine if another jail 1002 * has claimed its name. Accomplish 1003 * this by implicitly re-setting the 1004 * name. 1005 */ 1006 if (name == NULL) 1007 name = prison_name(mypr, pr); 1008 } 1009 } 1010 } 1011 if (pr == NULL) { 1012 /* Update: jid must exist. */ 1013 if (cuflags == JAIL_UPDATE) { 1014 error = ENOENT; 1015 vfs_opterror(opts, "jail %d not found", jid); 1016 goto done_unlock_list; 1017 } 1018 } 1019 } 1020 /* 1021 * If the caller provided a name, look for a jail by that name. 1022 * This has different semantics for creates and updates keyed by jid 1023 * (where the name must not already exist in a different jail), 1024 * and updates keyed by the name itself (where the name must exist 1025 * because that is the jail being updated). 1026 */ 1027 namelc = NULL; 1028 if (name != NULL) { 1029 namelc = strrchr(name, '.'); 1030 if (namelc == NULL) 1031 namelc = name; 1032 else { 1033 /* 1034 * This is a hierarchical name. Split it into the 1035 * parent and child names, and make sure the parent 1036 * exists or matches an already found jail. 1037 */ 1038 if (pr != NULL) { 1039 if (strncmp(name, ppr->pr_name, namelc - name) 1040 || ppr->pr_name[namelc - name] != '\0') { 1041 mtx_unlock(&pr->pr_mtx); 1042 error = EINVAL; 1043 vfs_opterror(opts, 1044 "cannot change jail's parent"); 1045 goto done_unlock_list; 1046 } 1047 } else { 1048 *namelc = '\0'; 1049 ppr = prison_find_name(mypr, name); 1050 if (ppr == NULL) { 1051 error = ENOENT; 1052 vfs_opterror(opts, 1053 "jail \"%s\" not found", name); 1054 goto done_unlock_list; 1055 } 1056 mtx_unlock(&ppr->pr_mtx); 1057 *namelc = '.'; 1058 } 1059 namelc++; 1060 } 1061 if (namelc[0] != '\0') { 1062 pnamelen = 1063 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1064 name_again: 1065 deadpr = NULL; 1066 FOREACH_PRISON_CHILD(ppr, tpr) { 1067 if (tpr != pr && tpr->pr_ref > 0 && 1068 !strcmp(tpr->pr_name + pnamelen, namelc)) { 1069 if (pr == NULL && 1070 cuflags != JAIL_CREATE) { 1071 mtx_lock(&tpr->pr_mtx); 1072 if (tpr->pr_ref > 0) { 1073 /* 1074 * Use this jail 1075 * for updates. 1076 */ 1077 if (tpr->pr_uref > 0) { 1078 pr = tpr; 1079 break; 1080 } 1081 deadpr = tpr; 1082 } 1083 mtx_unlock(&tpr->pr_mtx); 1084 } else if (tpr->pr_uref > 0) { 1085 /* 1086 * Create, or update(jid): 1087 * name must not exist in an 1088 * active sibling jail. 1089 */ 1090 error = EEXIST; 1091 if (pr != NULL) 1092 mtx_unlock(&pr->pr_mtx); 1093 vfs_opterror(opts, 1094 "jail \"%s\" already exists", 1095 name); 1096 goto done_unlock_list; 1097 } 1098 } 1099 } 1100 /* If no active jail is found, use a dying one. */ 1101 if (deadpr != NULL && pr == NULL) { 1102 if (flags & JAIL_DYING) { 1103 mtx_lock(&deadpr->pr_mtx); 1104 if (deadpr->pr_ref == 0) { 1105 mtx_unlock(&deadpr->pr_mtx); 1106 goto name_again; 1107 } 1108 pr = deadpr; 1109 } else if (cuflags == JAIL_UPDATE) { 1110 error = ENOENT; 1111 vfs_opterror(opts, 1112 "jail \"%s\" is dying", name); 1113 goto done_unlock_list; 1114 } 1115 } 1116 /* Update: name must exist if no jid. */ 1117 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1118 error = ENOENT; 1119 vfs_opterror(opts, "jail \"%s\" not found", 1120 name); 1121 goto done_unlock_list; 1122 } 1123 } 1124 } 1125 /* Update: must provide a jid or name. */ 1126 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1127 error = ENOENT; 1128 vfs_opterror(opts, "update specified no jail"); 1129 goto done_unlock_list; 1130 } 1131 1132 /* If there's no prison to update, create a new one and link it in. */ 1133 if (pr == NULL) { 1134 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1135 if (tpr->pr_childcount >= tpr->pr_childmax) { 1136 error = EPERM; 1137 vfs_opterror(opts, "prison limit exceeded"); 1138 goto done_unlock_list; 1139 } 1140 created = 1; 1141 mtx_lock(&ppr->pr_mtx); 1142 if (ppr->pr_ref == 0) { 1143 mtx_unlock(&ppr->pr_mtx); 1144 error = ENOENT; 1145 vfs_opterror(opts, "jail \"%s\" not found", 1146 prison_name(mypr, ppr)); 1147 goto done_unlock_list; 1148 } 1149 ppr->pr_ref++; 1150 ppr->pr_uref++; 1151 mtx_unlock(&ppr->pr_mtx); 1152 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1153 if (jid == 0) { 1154 /* Find the next free jid. */ 1155 jid = lastprid + 1; 1156 findnext: 1157 if (jid == JAIL_MAX) 1158 jid = 1; 1159 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1160 if (tpr->pr_id < jid) 1161 continue; 1162 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1163 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1164 break; 1165 } 1166 if (jid == lastprid) { 1167 error = EAGAIN; 1168 vfs_opterror(opts, 1169 "no available jail IDs"); 1170 free(pr, M_PRISON); 1171 prison_deref(ppr, PD_DEREF | 1172 PD_DEUREF | PD_LIST_XLOCKED); 1173 goto done_releroot; 1174 } 1175 jid++; 1176 goto findnext; 1177 } 1178 lastprid = jid; 1179 } else { 1180 /* 1181 * The jail already has a jid (that did not yet exist), 1182 * so just find where to insert it. 1183 */ 1184 TAILQ_FOREACH(tpr, &allprison, pr_list) 1185 if (tpr->pr_id >= jid) { 1186 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1187 break; 1188 } 1189 } 1190 if (tpr == NULL) 1191 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1192 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1193 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1194 tpr->pr_childcount++; 1195 1196 pr->pr_parent = ppr; 1197 pr->pr_id = jid; 1198 1199 /* Set some default values, and inherit some from the parent. */ 1200 if (namelc == NULL) 1201 namelc = ""; 1202 if (path == NULL) { 1203 path = "/"; 1204 root = mypr->pr_root; 1205 vref(root); 1206 } 1207 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1208 pr->pr_flags |= PR_HOST; 1209 #if defined(INET) || defined(INET6) 1210 #ifdef VIMAGE 1211 if (!(pr_flags & PR_VNET)) 1212 #endif 1213 { 1214 #ifdef INET 1215 if (!(ch_flags & PR_IP4_USER)) 1216 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1217 else if (!(pr_flags & PR_IP4_USER)) { 1218 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1219 if (ppr->pr_ip4 != NULL) { 1220 pr->pr_ip4s = ppr->pr_ip4s; 1221 pr->pr_ip4 = malloc(pr->pr_ip4s * 1222 sizeof(struct in_addr), M_PRISON, 1223 M_WAITOK); 1224 bcopy(ppr->pr_ip4, pr->pr_ip4, 1225 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1226 } 1227 } 1228 #endif 1229 #ifdef INET6 1230 if (!(ch_flags & PR_IP6_USER)) 1231 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1232 else if (!(pr_flags & PR_IP6_USER)) { 1233 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1234 if (ppr->pr_ip6 != NULL) { 1235 pr->pr_ip6s = ppr->pr_ip6s; 1236 pr->pr_ip6 = malloc(pr->pr_ip6s * 1237 sizeof(struct in6_addr), M_PRISON, 1238 M_WAITOK); 1239 bcopy(ppr->pr_ip6, pr->pr_ip6, 1240 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1241 } 1242 } 1243 #endif 1244 } 1245 #endif 1246 /* Source address selection is always on by default. */ 1247 pr->pr_flags |= _PR_IP_SADDRSEL; 1248 1249 pr->pr_securelevel = ppr->pr_securelevel; 1250 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1251 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1252 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1253 1254 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1255 if (osrelstr == NULL) 1256 strcpy(pr->pr_osrelease, ppr->pr_osrelease); 1257 else 1258 strcpy(pr->pr_osrelease, osrelstr); 1259 1260 LIST_INIT(&pr->pr_children); 1261 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1262 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1263 1264 #ifdef VIMAGE 1265 /* Allocate a new vnet if specified. */ 1266 pr->pr_vnet = (pr_flags & PR_VNET) 1267 ? vnet_alloc() : ppr->pr_vnet; 1268 #endif 1269 /* 1270 * Allocate a dedicated cpuset for each jail. 1271 * Unlike other initial settings, this may return an erorr. 1272 */ 1273 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1274 if (error) { 1275 prison_deref(pr, PD_LIST_XLOCKED); 1276 goto done_releroot; 1277 } 1278 1279 mtx_lock(&pr->pr_mtx); 1280 /* 1281 * New prisons do not yet have a reference, because we do not 1282 * want others to see the incomplete prison once the 1283 * allprison_lock is downgraded. 1284 */ 1285 } else { 1286 created = 0; 1287 /* 1288 * Grab a reference for existing prisons, to ensure they 1289 * continue to exist for the duration of the call. 1290 */ 1291 pr->pr_ref++; 1292 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1293 if ((pr->pr_flags & PR_VNET) && 1294 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1295 error = EINVAL; 1296 vfs_opterror(opts, 1297 "vnet jails cannot have IP address restrictions"); 1298 goto done_deref_locked; 1299 } 1300 #endif 1301 #ifdef INET 1302 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1303 error = EINVAL; 1304 vfs_opterror(opts, 1305 "ip4 cannot be changed after creation"); 1306 goto done_deref_locked; 1307 } 1308 #endif 1309 #ifdef INET6 1310 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1311 error = EINVAL; 1312 vfs_opterror(opts, 1313 "ip6 cannot be changed after creation"); 1314 goto done_deref_locked; 1315 } 1316 #endif 1317 } 1318 1319 /* Do final error checking before setting anything. */ 1320 if (gotslevel) { 1321 if (slevel < ppr->pr_securelevel) { 1322 error = EPERM; 1323 goto done_deref_locked; 1324 } 1325 } 1326 if (gotchildmax) { 1327 if (childmax >= ppr->pr_childmax) { 1328 error = EPERM; 1329 goto done_deref_locked; 1330 } 1331 } 1332 if (gotenforce) { 1333 if (enforce < ppr->pr_enforce_statfs) { 1334 error = EPERM; 1335 goto done_deref_locked; 1336 } 1337 } 1338 if (gotrsnum) { 1339 /* 1340 * devfs_rsnum is a uint16_t 1341 */ 1342 if (rsnum < 0 || rsnum > 65535) { 1343 error = EINVAL; 1344 goto done_deref_locked; 1345 } 1346 /* 1347 * Nested jails always inherit parent's devfs ruleset 1348 */ 1349 if (jailed(td->td_ucred)) { 1350 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1351 error = EPERM; 1352 goto done_deref_locked; 1353 } else 1354 rsnum = ppr->pr_devfs_rsnum; 1355 } 1356 } 1357 #ifdef INET 1358 if (ip4s > 0) { 1359 if (ppr->pr_flags & PR_IP4) { 1360 /* 1361 * Make sure the new set of IP addresses is a 1362 * subset of the parent's list. Don't worry 1363 * about the parent being unlocked, as any 1364 * setting is done with allprison_lock held. 1365 */ 1366 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1367 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1368 break; 1369 if (ij == ppr->pr_ip4s) { 1370 error = EPERM; 1371 goto done_deref_locked; 1372 } 1373 if (ip4s > 1) { 1374 for (ii = ij = 1; ii < ip4s; ii++) { 1375 if (ip4[ii].s_addr == 1376 ppr->pr_ip4[0].s_addr) 1377 continue; 1378 for (; ij < ppr->pr_ip4s; ij++) 1379 if (ip4[ii].s_addr == 1380 ppr->pr_ip4[ij].s_addr) 1381 break; 1382 if (ij == ppr->pr_ip4s) 1383 break; 1384 } 1385 if (ij == ppr->pr_ip4s) { 1386 error = EPERM; 1387 goto done_deref_locked; 1388 } 1389 } 1390 } 1391 /* 1392 * Check for conflicting IP addresses. We permit them 1393 * if there is no more than one IP on each jail. If 1394 * there is a duplicate on a jail with more than one 1395 * IP stop checking and return error. 1396 */ 1397 #ifdef VIMAGE 1398 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1399 if (tppr->pr_flags & PR_VNET) 1400 break; 1401 #else 1402 tppr = &prison0; 1403 #endif 1404 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1405 if (tpr == pr || 1406 #ifdef VIMAGE 1407 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1408 #endif 1409 tpr->pr_uref == 0) { 1410 descend = 0; 1411 continue; 1412 } 1413 if (!(tpr->pr_flags & PR_IP4_USER)) 1414 continue; 1415 descend = 0; 1416 if (tpr->pr_ip4 == NULL || 1417 (ip4s == 1 && tpr->pr_ip4s == 1)) 1418 continue; 1419 for (ii = 0; ii < ip4s; ii++) { 1420 if (prison_check_ip4_locked(tpr, &ip4[ii]) == 1421 0) { 1422 error = EADDRINUSE; 1423 vfs_opterror(opts, 1424 "IPv4 addresses clash"); 1425 goto done_deref_locked; 1426 } 1427 } 1428 } 1429 } 1430 #endif 1431 #ifdef INET6 1432 if (ip6s > 0) { 1433 if (ppr->pr_flags & PR_IP6) { 1434 /* 1435 * Make sure the new set of IP addresses is a 1436 * subset of the parent's list. 1437 */ 1438 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1439 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1440 &ppr->pr_ip6[ij])) 1441 break; 1442 if (ij == ppr->pr_ip6s) { 1443 error = EPERM; 1444 goto done_deref_locked; 1445 } 1446 if (ip6s > 1) { 1447 for (ii = ij = 1; ii < ip6s; ii++) { 1448 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1449 &ppr->pr_ip6[0])) 1450 continue; 1451 for (; ij < ppr->pr_ip6s; ij++) 1452 if (IN6_ARE_ADDR_EQUAL( 1453 &ip6[ii], &ppr->pr_ip6[ij])) 1454 break; 1455 if (ij == ppr->pr_ip6s) 1456 break; 1457 } 1458 if (ij == ppr->pr_ip6s) { 1459 error = EPERM; 1460 goto done_deref_locked; 1461 } 1462 } 1463 } 1464 /* Check for conflicting IP addresses. */ 1465 #ifdef VIMAGE 1466 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1467 if (tppr->pr_flags & PR_VNET) 1468 break; 1469 #else 1470 tppr = &prison0; 1471 #endif 1472 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1473 if (tpr == pr || 1474 #ifdef VIMAGE 1475 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1476 #endif 1477 tpr->pr_uref == 0) { 1478 descend = 0; 1479 continue; 1480 } 1481 if (!(tpr->pr_flags & PR_IP6_USER)) 1482 continue; 1483 descend = 0; 1484 if (tpr->pr_ip6 == NULL || 1485 (ip6s == 1 && tpr->pr_ip6s == 1)) 1486 continue; 1487 for (ii = 0; ii < ip6s; ii++) { 1488 if (prison_check_ip6_locked(tpr, &ip6[ii]) == 1489 0) { 1490 error = EADDRINUSE; 1491 vfs_opterror(opts, 1492 "IPv6 addresses clash"); 1493 goto done_deref_locked; 1494 } 1495 } 1496 } 1497 } 1498 #endif 1499 onamelen = namelen = 0; 1500 if (namelc != NULL) { 1501 /* Give a default name of the jid. Also allow the name to be 1502 * explicitly the jid - but not any other number, and only in 1503 * normal form (no leading zero/etc). 1504 */ 1505 if (namelc[0] == '\0') 1506 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1507 else if ((strtoul(namelc, &p, 10) != jid || 1508 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1509 error = EINVAL; 1510 vfs_opterror(opts, 1511 "name cannot be numeric (unless it is the jid)"); 1512 goto done_deref_locked; 1513 } 1514 /* 1515 * Make sure the name isn't too long for the prison or its 1516 * children. 1517 */ 1518 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1519 onamelen = strlen(pr->pr_name + pnamelen); 1520 namelen = strlen(namelc); 1521 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1522 error = ENAMETOOLONG; 1523 goto done_deref_locked; 1524 } 1525 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1526 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1527 sizeof(pr->pr_name)) { 1528 error = ENAMETOOLONG; 1529 goto done_deref_locked; 1530 } 1531 } 1532 } 1533 if (pr_allow & ~ppr->pr_allow) { 1534 error = EPERM; 1535 goto done_deref_locked; 1536 } 1537 1538 /* 1539 * Let modules check their parameters. This requires unlocking and 1540 * then re-locking the prison, but this is still a valid state as long 1541 * as allprison_lock remains xlocked. 1542 */ 1543 mtx_unlock(&pr->pr_mtx); 1544 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1545 if (error != 0) { 1546 prison_deref(pr, created 1547 ? PD_LIST_XLOCKED 1548 : PD_DEREF | PD_LIST_XLOCKED); 1549 goto done_releroot; 1550 } 1551 mtx_lock(&pr->pr_mtx); 1552 1553 /* At this point, all valid parameters should have been noted. */ 1554 TAILQ_FOREACH(opt, opts, link) { 1555 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1556 error = EINVAL; 1557 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1558 goto done_deref_locked; 1559 } 1560 } 1561 1562 /* Set the parameters of the prison. */ 1563 #ifdef INET 1564 redo_ip4 = 0; 1565 if (pr_flags & PR_IP4_USER) { 1566 pr->pr_flags |= PR_IP4; 1567 free(pr->pr_ip4, M_PRISON); 1568 pr->pr_ip4s = ip4s; 1569 pr->pr_ip4 = ip4; 1570 ip4 = NULL; 1571 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1572 #ifdef VIMAGE 1573 if (tpr->pr_flags & PR_VNET) { 1574 descend = 0; 1575 continue; 1576 } 1577 #endif 1578 if (prison_restrict_ip4(tpr, NULL)) { 1579 redo_ip4 = 1; 1580 descend = 0; 1581 } 1582 } 1583 } 1584 #endif 1585 #ifdef INET6 1586 redo_ip6 = 0; 1587 if (pr_flags & PR_IP6_USER) { 1588 pr->pr_flags |= PR_IP6; 1589 free(pr->pr_ip6, M_PRISON); 1590 pr->pr_ip6s = ip6s; 1591 pr->pr_ip6 = ip6; 1592 ip6 = NULL; 1593 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1594 #ifdef VIMAGE 1595 if (tpr->pr_flags & PR_VNET) { 1596 descend = 0; 1597 continue; 1598 } 1599 #endif 1600 if (prison_restrict_ip6(tpr, NULL)) { 1601 redo_ip6 = 1; 1602 descend = 0; 1603 } 1604 } 1605 } 1606 #endif 1607 if (gotslevel) { 1608 pr->pr_securelevel = slevel; 1609 /* Set all child jails to be at least this level. */ 1610 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1611 if (tpr->pr_securelevel < slevel) 1612 tpr->pr_securelevel = slevel; 1613 } 1614 if (gotchildmax) { 1615 pr->pr_childmax = childmax; 1616 /* Set all child jails to under this limit. */ 1617 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1618 if (tpr->pr_childmax > childmax - level) 1619 tpr->pr_childmax = childmax > level 1620 ? childmax - level : 0; 1621 } 1622 if (gotenforce) { 1623 pr->pr_enforce_statfs = enforce; 1624 /* Pass this restriction on to the children. */ 1625 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1626 if (tpr->pr_enforce_statfs < enforce) 1627 tpr->pr_enforce_statfs = enforce; 1628 } 1629 if (gotrsnum) { 1630 pr->pr_devfs_rsnum = rsnum; 1631 /* Pass this restriction on to the children. */ 1632 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1633 tpr->pr_devfs_rsnum = rsnum; 1634 } 1635 if (namelc != NULL) { 1636 if (ppr == &prison0) 1637 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1638 else 1639 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1640 ppr->pr_name, namelc); 1641 /* Change this component of child names. */ 1642 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1643 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1644 strlen(tpr->pr_name + onamelen) + 1); 1645 bcopy(pr->pr_name, tpr->pr_name, namelen); 1646 } 1647 } 1648 if (path != NULL) { 1649 /* Try to keep a real-rooted full pathname. */ 1650 if (fullpath_disabled && path[0] == '/' && 1651 strcmp(mypr->pr_path, "/")) 1652 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1653 mypr->pr_path, path); 1654 else 1655 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1656 pr->pr_root = root; 1657 } 1658 if (PR_HOST & ch_flags & ~pr_flags) { 1659 if (pr->pr_flags & PR_HOST) { 1660 /* 1661 * Copy the parent's host info. As with pr_ip4 above, 1662 * the lack of a lock on the parent is not a problem; 1663 * it is always set with allprison_lock at least 1664 * shared, and is held exclusively here. 1665 */ 1666 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1667 sizeof(pr->pr_hostname)); 1668 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1669 sizeof(pr->pr_domainname)); 1670 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1671 sizeof(pr->pr_hostuuid)); 1672 pr->pr_hostid = pr->pr_parent->pr_hostid; 1673 } 1674 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1675 /* Set this prison, and any descendants without PR_HOST. */ 1676 if (host != NULL) 1677 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1678 if (domain != NULL) 1679 strlcpy(pr->pr_domainname, domain, 1680 sizeof(pr->pr_domainname)); 1681 if (uuid != NULL) 1682 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1683 if (gothid) 1684 pr->pr_hostid = hid; 1685 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1686 if (tpr->pr_flags & PR_HOST) 1687 descend = 0; 1688 else { 1689 if (host != NULL) 1690 strlcpy(tpr->pr_hostname, 1691 pr->pr_hostname, 1692 sizeof(tpr->pr_hostname)); 1693 if (domain != NULL) 1694 strlcpy(tpr->pr_domainname, 1695 pr->pr_domainname, 1696 sizeof(tpr->pr_domainname)); 1697 if (uuid != NULL) 1698 strlcpy(tpr->pr_hostuuid, 1699 pr->pr_hostuuid, 1700 sizeof(tpr->pr_hostuuid)); 1701 if (gothid) 1702 tpr->pr_hostid = hid; 1703 } 1704 } 1705 } 1706 if ((tallow = ch_allow & ~pr_allow)) { 1707 /* Clear allow bits in all children. */ 1708 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1709 tpr->pr_allow &= ~tallow; 1710 } 1711 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1712 /* 1713 * Persistent prisons get an extra reference, and prisons losing their 1714 * persist flag lose that reference. Only do this for existing prisons 1715 * for now, so new ones will remain unseen until after the module 1716 * handlers have completed. 1717 */ 1718 born = pr->pr_uref == 0; 1719 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1720 if (pr_flags & PR_PERSIST) { 1721 pr->pr_ref++; 1722 pr->pr_uref++; 1723 } else { 1724 pr->pr_ref--; 1725 pr->pr_uref--; 1726 } 1727 } 1728 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1729 mtx_unlock(&pr->pr_mtx); 1730 1731 #ifdef RACCT 1732 if (racct_enable && created) 1733 prison_racct_attach(pr); 1734 #endif 1735 1736 /* Locks may have prevented a complete restriction of child IP 1737 * addresses. If so, allocate some more memory and try again. 1738 */ 1739 #ifdef INET 1740 while (redo_ip4) { 1741 ip4s = pr->pr_ip4s; 1742 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1743 mtx_lock(&pr->pr_mtx); 1744 redo_ip4 = 0; 1745 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1746 #ifdef VIMAGE 1747 if (tpr->pr_flags & PR_VNET) { 1748 descend = 0; 1749 continue; 1750 } 1751 #endif 1752 if (prison_restrict_ip4(tpr, ip4)) { 1753 if (ip4 != NULL) 1754 ip4 = NULL; 1755 else 1756 redo_ip4 = 1; 1757 } 1758 } 1759 mtx_unlock(&pr->pr_mtx); 1760 } 1761 #endif 1762 #ifdef INET6 1763 while (redo_ip6) { 1764 ip6s = pr->pr_ip6s; 1765 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1766 mtx_lock(&pr->pr_mtx); 1767 redo_ip6 = 0; 1768 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1769 #ifdef VIMAGE 1770 if (tpr->pr_flags & PR_VNET) { 1771 descend = 0; 1772 continue; 1773 } 1774 #endif 1775 if (prison_restrict_ip6(tpr, ip6)) { 1776 if (ip6 != NULL) 1777 ip6 = NULL; 1778 else 1779 redo_ip6 = 1; 1780 } 1781 } 1782 mtx_unlock(&pr->pr_mtx); 1783 } 1784 #endif 1785 1786 /* Let the modules do their work. */ 1787 sx_downgrade(&allprison_lock); 1788 if (born) { 1789 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1790 if (error) { 1791 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1792 prison_deref(pr, created 1793 ? PD_LIST_SLOCKED 1794 : PD_DEREF | PD_LIST_SLOCKED); 1795 goto done_errmsg; 1796 } 1797 } 1798 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1799 if (error) { 1800 if (born) 1801 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1802 prison_deref(pr, created 1803 ? PD_LIST_SLOCKED 1804 : PD_DEREF | PD_LIST_SLOCKED); 1805 goto done_errmsg; 1806 } 1807 1808 /* Attach this process to the prison if requested. */ 1809 if (flags & JAIL_ATTACH) { 1810 mtx_lock(&pr->pr_mtx); 1811 error = do_jail_attach(td, pr); 1812 if (error) { 1813 vfs_opterror(opts, "attach failed"); 1814 if (!created) 1815 prison_deref(pr, PD_DEREF); 1816 goto done_errmsg; 1817 } 1818 } 1819 1820 #ifdef RACCT 1821 if (racct_enable && !created) { 1822 if (!(flags & JAIL_ATTACH)) 1823 sx_sunlock(&allprison_lock); 1824 prison_racct_modify(pr); 1825 if (!(flags & JAIL_ATTACH)) 1826 sx_slock(&allprison_lock); 1827 } 1828 #endif 1829 1830 td->td_retval[0] = pr->pr_id; 1831 1832 /* 1833 * Now that it is all there, drop the temporary reference from existing 1834 * prisons. Or add a reference to newly created persistent prisons 1835 * (which was not done earlier so that the prison would not be publicly 1836 * visible). 1837 */ 1838 if (!created) { 1839 prison_deref(pr, (flags & JAIL_ATTACH) 1840 ? PD_DEREF 1841 : PD_DEREF | PD_LIST_SLOCKED); 1842 } else { 1843 if (pr_flags & PR_PERSIST) { 1844 mtx_lock(&pr->pr_mtx); 1845 pr->pr_ref++; 1846 pr->pr_uref++; 1847 mtx_unlock(&pr->pr_mtx); 1848 } 1849 if (!(flags & JAIL_ATTACH)) 1850 sx_sunlock(&allprison_lock); 1851 } 1852 1853 goto done_free; 1854 1855 done_deref_locked: 1856 prison_deref(pr, created 1857 ? PD_LOCKED | PD_LIST_XLOCKED 1858 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1859 goto done_releroot; 1860 done_unlock_list: 1861 sx_xunlock(&allprison_lock); 1862 done_releroot: 1863 if (root != NULL) 1864 vrele(root); 1865 done_errmsg: 1866 if (error) { 1867 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 1868 &errmsg_len) == 0 && errmsg_len > 0) { 1869 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1870 if (optuio->uio_segflg == UIO_SYSSPACE) 1871 bcopy(errmsg, 1872 optuio->uio_iov[errmsg_pos].iov_base, 1873 errmsg_len); 1874 else 1875 copyout(errmsg, 1876 optuio->uio_iov[errmsg_pos].iov_base, 1877 errmsg_len); 1878 } 1879 } 1880 done_free: 1881 #ifdef INET 1882 free(ip4, M_PRISON); 1883 #endif 1884 #ifdef INET6 1885 free(ip6, M_PRISON); 1886 #endif 1887 if (g_path != NULL) 1888 free(g_path, M_TEMP); 1889 vfs_freeopts(opts); 1890 return (error); 1891 } 1892 1893 1894 /* 1895 * struct jail_get_args { 1896 * struct iovec *iovp; 1897 * unsigned int iovcnt; 1898 * int flags; 1899 * }; 1900 */ 1901 int 1902 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1903 { 1904 struct uio *auio; 1905 int error; 1906 1907 /* Check that we have an even number of iovecs. */ 1908 if (uap->iovcnt & 1) 1909 return (EINVAL); 1910 1911 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1912 if (error) 1913 return (error); 1914 error = kern_jail_get(td, auio, uap->flags); 1915 if (error == 0) 1916 error = copyout(auio->uio_iov, uap->iovp, 1917 uap->iovcnt * sizeof (struct iovec)); 1918 free(auio, M_IOV); 1919 return (error); 1920 } 1921 1922 int 1923 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1924 { 1925 struct bool_flags *bf; 1926 struct jailsys_flags *jsf; 1927 struct prison *pr, *mypr; 1928 struct vfsopt *opt; 1929 struct vfsoptlist *opts; 1930 char *errmsg, *name; 1931 int error, errmsg_len, errmsg_pos, i, jid, len, locked, pos; 1932 unsigned f; 1933 1934 if (flags & ~JAIL_GET_MASK) 1935 return (EINVAL); 1936 1937 /* Get the parameter list. */ 1938 error = vfs_buildopts(optuio, &opts); 1939 if (error) 1940 return (error); 1941 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1942 mypr = td->td_ucred->cr_prison; 1943 1944 /* 1945 * Find the prison specified by one of: lastjid, jid, name. 1946 */ 1947 sx_slock(&allprison_lock); 1948 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1949 if (error == 0) { 1950 TAILQ_FOREACH(pr, &allprison, pr_list) { 1951 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1952 mtx_lock(&pr->pr_mtx); 1953 if (pr->pr_ref > 0 && 1954 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1955 break; 1956 mtx_unlock(&pr->pr_mtx); 1957 } 1958 } 1959 if (pr != NULL) 1960 goto found_prison; 1961 error = ENOENT; 1962 vfs_opterror(opts, "no jail after %d", jid); 1963 goto done_unlock_list; 1964 } else if (error != ENOENT) 1965 goto done_unlock_list; 1966 1967 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1968 if (error == 0) { 1969 if (jid != 0) { 1970 pr = prison_find_child(mypr, jid); 1971 if (pr != NULL) { 1972 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1973 mtx_unlock(&pr->pr_mtx); 1974 error = ENOENT; 1975 vfs_opterror(opts, "jail %d is dying", 1976 jid); 1977 goto done_unlock_list; 1978 } 1979 goto found_prison; 1980 } 1981 error = ENOENT; 1982 vfs_opterror(opts, "jail %d not found", jid); 1983 goto done_unlock_list; 1984 } 1985 } else if (error != ENOENT) 1986 goto done_unlock_list; 1987 1988 error = vfs_getopt(opts, "name", (void **)&name, &len); 1989 if (error == 0) { 1990 if (len == 0 || name[len - 1] != '\0') { 1991 error = EINVAL; 1992 goto done_unlock_list; 1993 } 1994 pr = prison_find_name(mypr, name); 1995 if (pr != NULL) { 1996 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1997 mtx_unlock(&pr->pr_mtx); 1998 error = ENOENT; 1999 vfs_opterror(opts, "jail \"%s\" is dying", 2000 name); 2001 goto done_unlock_list; 2002 } 2003 goto found_prison; 2004 } 2005 error = ENOENT; 2006 vfs_opterror(opts, "jail \"%s\" not found", name); 2007 goto done_unlock_list; 2008 } else if (error != ENOENT) 2009 goto done_unlock_list; 2010 2011 vfs_opterror(opts, "no jail specified"); 2012 error = ENOENT; 2013 goto done_unlock_list; 2014 2015 found_prison: 2016 /* Get the parameters of the prison. */ 2017 pr->pr_ref++; 2018 locked = PD_LOCKED; 2019 td->td_retval[0] = pr->pr_id; 2020 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2021 if (error != 0 && error != ENOENT) 2022 goto done_deref; 2023 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2024 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2025 if (error != 0 && error != ENOENT) 2026 goto done_deref; 2027 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2028 if (error != 0 && error != ENOENT) 2029 goto done_deref; 2030 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2031 sizeof(pr->pr_cpuset->cs_id)); 2032 if (error != 0 && error != ENOENT) 2033 goto done_deref; 2034 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2035 if (error != 0 && error != ENOENT) 2036 goto done_deref; 2037 #ifdef INET 2038 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2039 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2040 if (error != 0 && error != ENOENT) 2041 goto done_deref; 2042 #endif 2043 #ifdef INET6 2044 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2045 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2046 if (error != 0 && error != ENOENT) 2047 goto done_deref; 2048 #endif 2049 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2050 sizeof(pr->pr_securelevel)); 2051 if (error != 0 && error != ENOENT) 2052 goto done_deref; 2053 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2054 sizeof(pr->pr_childcount)); 2055 if (error != 0 && error != ENOENT) 2056 goto done_deref; 2057 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2058 sizeof(pr->pr_childmax)); 2059 if (error != 0 && error != ENOENT) 2060 goto done_deref; 2061 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2062 if (error != 0 && error != ENOENT) 2063 goto done_deref; 2064 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2065 if (error != 0 && error != ENOENT) 2066 goto done_deref; 2067 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2068 if (error != 0 && error != ENOENT) 2069 goto done_deref; 2070 #ifdef COMPAT_FREEBSD32 2071 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2072 uint32_t hid32 = pr->pr_hostid; 2073 2074 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2075 } else 2076 #endif 2077 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2078 sizeof(pr->pr_hostid)); 2079 if (error != 0 && error != ENOENT) 2080 goto done_deref; 2081 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2082 sizeof(pr->pr_enforce_statfs)); 2083 if (error != 0 && error != ENOENT) 2084 goto done_deref; 2085 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2086 sizeof(pr->pr_devfs_rsnum)); 2087 if (error != 0 && error != ENOENT) 2088 goto done_deref; 2089 for (bf = pr_flag_bool; 2090 bf < pr_flag_bool + nitems(pr_flag_bool); 2091 bf++) { 2092 i = (pr->pr_flags & bf->flag) ? 1 : 0; 2093 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2094 if (error != 0 && error != ENOENT) 2095 goto done_deref; 2096 i = !i; 2097 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2098 if (error != 0 && error != ENOENT) 2099 goto done_deref; 2100 } 2101 for (jsf = pr_flag_jailsys; 2102 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 2103 jsf++) { 2104 f = pr->pr_flags & (jsf->disable | jsf->new); 2105 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE 2106 : (f == jsf->new) ? JAIL_SYS_NEW 2107 : JAIL_SYS_INHERIT; 2108 error = vfs_setopt(opts, jsf->name, &i, sizeof(i)); 2109 if (error != 0 && error != ENOENT) 2110 goto done_deref; 2111 } 2112 for (bf = pr_flag_allow; 2113 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 2114 bf++) { 2115 i = (pr->pr_allow & bf->flag) ? 1 : 0; 2116 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2117 if (error != 0 && error != ENOENT) 2118 goto done_deref; 2119 i = !i; 2120 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2121 if (error != 0 && error != ENOENT) 2122 goto done_deref; 2123 } 2124 i = (pr->pr_uref == 0); 2125 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2126 if (error != 0 && error != ENOENT) 2127 goto done_deref; 2128 i = !i; 2129 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2130 if (error != 0 && error != ENOENT) 2131 goto done_deref; 2132 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2133 sizeof(pr->pr_osreldate)); 2134 if (error != 0 && error != ENOENT) 2135 goto done_deref; 2136 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2137 if (error != 0 && error != ENOENT) 2138 goto done_deref; 2139 2140 /* Get the module parameters. */ 2141 mtx_unlock(&pr->pr_mtx); 2142 locked = 0; 2143 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2144 if (error) 2145 goto done_deref; 2146 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2147 2148 /* By now, all parameters should have been noted. */ 2149 TAILQ_FOREACH(opt, opts, link) { 2150 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2151 error = EINVAL; 2152 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2153 goto done_errmsg; 2154 } 2155 } 2156 2157 /* Write the fetched parameters back to userspace. */ 2158 error = 0; 2159 TAILQ_FOREACH(opt, opts, link) { 2160 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2161 pos = 2 * opt->pos + 1; 2162 optuio->uio_iov[pos].iov_len = opt->len; 2163 if (opt->value != NULL) { 2164 if (optuio->uio_segflg == UIO_SYSSPACE) { 2165 bcopy(opt->value, 2166 optuio->uio_iov[pos].iov_base, 2167 opt->len); 2168 } else { 2169 error = copyout(opt->value, 2170 optuio->uio_iov[pos].iov_base, 2171 opt->len); 2172 if (error) 2173 break; 2174 } 2175 } 2176 } 2177 } 2178 goto done_errmsg; 2179 2180 done_deref: 2181 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2182 goto done_errmsg; 2183 2184 done_unlock_list: 2185 sx_sunlock(&allprison_lock); 2186 done_errmsg: 2187 if (error && errmsg_pos >= 0) { 2188 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2189 errmsg_pos = 2 * errmsg_pos + 1; 2190 if (errmsg_len > 0) { 2191 if (optuio->uio_segflg == UIO_SYSSPACE) 2192 bcopy(errmsg, 2193 optuio->uio_iov[errmsg_pos].iov_base, 2194 errmsg_len); 2195 else 2196 copyout(errmsg, 2197 optuio->uio_iov[errmsg_pos].iov_base, 2198 errmsg_len); 2199 } 2200 } 2201 vfs_freeopts(opts); 2202 return (error); 2203 } 2204 2205 2206 /* 2207 * struct jail_remove_args { 2208 * int jid; 2209 * }; 2210 */ 2211 int 2212 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2213 { 2214 struct prison *pr, *cpr, *lpr, *tpr; 2215 int descend, error; 2216 2217 error = priv_check(td, PRIV_JAIL_REMOVE); 2218 if (error) 2219 return (error); 2220 2221 sx_xlock(&allprison_lock); 2222 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2223 if (pr == NULL) { 2224 sx_xunlock(&allprison_lock); 2225 return (EINVAL); 2226 } 2227 2228 /* Remove all descendants of this prison, then remove this prison. */ 2229 pr->pr_ref++; 2230 if (!LIST_EMPTY(&pr->pr_children)) { 2231 mtx_unlock(&pr->pr_mtx); 2232 lpr = NULL; 2233 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2234 mtx_lock(&cpr->pr_mtx); 2235 if (cpr->pr_ref > 0) { 2236 tpr = cpr; 2237 cpr->pr_ref++; 2238 } else { 2239 /* Already removed - do not do it again. */ 2240 tpr = NULL; 2241 } 2242 mtx_unlock(&cpr->pr_mtx); 2243 if (lpr != NULL) { 2244 mtx_lock(&lpr->pr_mtx); 2245 prison_remove_one(lpr); 2246 sx_xlock(&allprison_lock); 2247 } 2248 lpr = tpr; 2249 } 2250 if (lpr != NULL) { 2251 mtx_lock(&lpr->pr_mtx); 2252 prison_remove_one(lpr); 2253 sx_xlock(&allprison_lock); 2254 } 2255 mtx_lock(&pr->pr_mtx); 2256 } 2257 prison_remove_one(pr); 2258 return (0); 2259 } 2260 2261 static void 2262 prison_remove_one(struct prison *pr) 2263 { 2264 struct proc *p; 2265 int deuref; 2266 2267 /* If the prison was persistent, it is not anymore. */ 2268 deuref = 0; 2269 if (pr->pr_flags & PR_PERSIST) { 2270 pr->pr_ref--; 2271 deuref = PD_DEUREF; 2272 pr->pr_flags &= ~PR_PERSIST; 2273 } 2274 2275 /* 2276 * jail_remove added a reference. If that's the only one, remove 2277 * the prison now. 2278 */ 2279 KASSERT(pr->pr_ref > 0, 2280 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2281 if (pr->pr_ref == 1) { 2282 prison_deref(pr, 2283 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2284 return; 2285 } 2286 2287 mtx_unlock(&pr->pr_mtx); 2288 sx_xunlock(&allprison_lock); 2289 /* 2290 * Kill all processes unfortunate enough to be attached to this prison. 2291 */ 2292 sx_slock(&allproc_lock); 2293 FOREACH_PROC_IN_SYSTEM(p) { 2294 PROC_LOCK(p); 2295 if (p->p_state != PRS_NEW && p->p_ucred && 2296 p->p_ucred->cr_prison == pr) 2297 kern_psignal(p, SIGKILL); 2298 PROC_UNLOCK(p); 2299 } 2300 sx_sunlock(&allproc_lock); 2301 /* Remove the temporary reference added by jail_remove. */ 2302 prison_deref(pr, deuref | PD_DEREF); 2303 } 2304 2305 2306 /* 2307 * struct jail_attach_args { 2308 * int jid; 2309 * }; 2310 */ 2311 int 2312 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2313 { 2314 struct prison *pr; 2315 int error; 2316 2317 error = priv_check(td, PRIV_JAIL_ATTACH); 2318 if (error) 2319 return (error); 2320 2321 /* 2322 * Start with exclusive hold on allprison_lock to ensure that a possible 2323 * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove. 2324 * But then immediately downgrade it since we don't need to stop 2325 * readers. 2326 */ 2327 sx_xlock(&allprison_lock); 2328 sx_downgrade(&allprison_lock); 2329 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2330 if (pr == NULL) { 2331 sx_sunlock(&allprison_lock); 2332 return (EINVAL); 2333 } 2334 2335 /* 2336 * Do not allow a process to attach to a prison that is not 2337 * considered to be "alive". 2338 */ 2339 if (pr->pr_uref == 0) { 2340 mtx_unlock(&pr->pr_mtx); 2341 sx_sunlock(&allprison_lock); 2342 return (EINVAL); 2343 } 2344 2345 return (do_jail_attach(td, pr)); 2346 } 2347 2348 static int 2349 do_jail_attach(struct thread *td, struct prison *pr) 2350 { 2351 struct proc *p; 2352 struct ucred *newcred, *oldcred; 2353 int error; 2354 2355 /* 2356 * XXX: Note that there is a slight race here if two threads 2357 * in the same privileged process attempt to attach to two 2358 * different jails at the same time. It is important for 2359 * user processes not to do this, or they might end up with 2360 * a process root from one prison, but attached to the jail 2361 * of another. 2362 */ 2363 pr->pr_ref++; 2364 pr->pr_uref++; 2365 mtx_unlock(&pr->pr_mtx); 2366 2367 /* Let modules do whatever they need to prepare for attaching. */ 2368 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2369 if (error) { 2370 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2371 return (error); 2372 } 2373 sx_sunlock(&allprison_lock); 2374 2375 /* 2376 * Reparent the newly attached process to this jail. 2377 */ 2378 p = td->td_proc; 2379 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2380 if (error) 2381 goto e_revert_osd; 2382 2383 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2384 if ((error = change_dir(pr->pr_root, td)) != 0) 2385 goto e_unlock; 2386 #ifdef MAC 2387 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2388 goto e_unlock; 2389 #endif 2390 VOP_UNLOCK(pr->pr_root, 0); 2391 if ((error = pwd_chroot(td, pr->pr_root))) 2392 goto e_revert_osd; 2393 2394 newcred = crget(); 2395 PROC_LOCK(p); 2396 oldcred = crcopysafe(p, newcred); 2397 newcred->cr_prison = pr; 2398 proc_set_cred(p, newcred); 2399 setsugid(p); 2400 #ifdef RACCT 2401 racct_proc_ucred_changed(p, oldcred, newcred); 2402 crhold(newcred); 2403 #endif 2404 PROC_UNLOCK(p); 2405 #ifdef RCTL 2406 rctl_proc_ucred_changed(p, newcred); 2407 crfree(newcred); 2408 #endif 2409 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF); 2410 crfree(oldcred); 2411 return (0); 2412 2413 e_unlock: 2414 VOP_UNLOCK(pr->pr_root, 0); 2415 e_revert_osd: 2416 /* Tell modules this thread is still in its old jail after all. */ 2417 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2418 prison_deref(pr, PD_DEREF | PD_DEUREF); 2419 return (error); 2420 } 2421 2422 2423 /* 2424 * Returns a locked prison instance, or NULL on failure. 2425 */ 2426 struct prison * 2427 prison_find(int prid) 2428 { 2429 struct prison *pr; 2430 2431 sx_assert(&allprison_lock, SX_LOCKED); 2432 TAILQ_FOREACH(pr, &allprison, pr_list) { 2433 if (pr->pr_id == prid) { 2434 mtx_lock(&pr->pr_mtx); 2435 if (pr->pr_ref > 0) 2436 return (pr); 2437 mtx_unlock(&pr->pr_mtx); 2438 } 2439 } 2440 return (NULL); 2441 } 2442 2443 /* 2444 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2445 */ 2446 struct prison * 2447 prison_find_child(struct prison *mypr, int prid) 2448 { 2449 struct prison *pr; 2450 int descend; 2451 2452 sx_assert(&allprison_lock, SX_LOCKED); 2453 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2454 if (pr->pr_id == prid) { 2455 mtx_lock(&pr->pr_mtx); 2456 if (pr->pr_ref > 0) 2457 return (pr); 2458 mtx_unlock(&pr->pr_mtx); 2459 } 2460 } 2461 return (NULL); 2462 } 2463 2464 /* 2465 * Look for the name relative to mypr. Returns a locked prison or NULL. 2466 */ 2467 struct prison * 2468 prison_find_name(struct prison *mypr, const char *name) 2469 { 2470 struct prison *pr, *deadpr; 2471 size_t mylen; 2472 int descend; 2473 2474 sx_assert(&allprison_lock, SX_LOCKED); 2475 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2476 again: 2477 deadpr = NULL; 2478 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2479 if (!strcmp(pr->pr_name + mylen, name)) { 2480 mtx_lock(&pr->pr_mtx); 2481 if (pr->pr_ref > 0) { 2482 if (pr->pr_uref > 0) 2483 return (pr); 2484 deadpr = pr; 2485 } 2486 mtx_unlock(&pr->pr_mtx); 2487 } 2488 } 2489 /* There was no valid prison - perhaps there was a dying one. */ 2490 if (deadpr != NULL) { 2491 mtx_lock(&deadpr->pr_mtx); 2492 if (deadpr->pr_ref == 0) { 2493 mtx_unlock(&deadpr->pr_mtx); 2494 goto again; 2495 } 2496 } 2497 return (deadpr); 2498 } 2499 2500 /* 2501 * See if a prison has the specific flag set. 2502 */ 2503 int 2504 prison_flag(struct ucred *cred, unsigned flag) 2505 { 2506 2507 /* This is an atomic read, so no locking is necessary. */ 2508 return (cred->cr_prison->pr_flags & flag); 2509 } 2510 2511 int 2512 prison_allow(struct ucred *cred, unsigned flag) 2513 { 2514 2515 /* This is an atomic read, so no locking is necessary. */ 2516 return (cred->cr_prison->pr_allow & flag); 2517 } 2518 2519 /* 2520 * Remove a prison reference. If that was the last reference, remove the 2521 * prison itself - but not in this context in case there are locks held. 2522 */ 2523 void 2524 prison_free_locked(struct prison *pr) 2525 { 2526 int ref; 2527 2528 mtx_assert(&pr->pr_mtx, MA_OWNED); 2529 ref = --pr->pr_ref; 2530 mtx_unlock(&pr->pr_mtx); 2531 if (ref == 0) 2532 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2533 } 2534 2535 void 2536 prison_free(struct prison *pr) 2537 { 2538 2539 mtx_lock(&pr->pr_mtx); 2540 prison_free_locked(pr); 2541 } 2542 2543 /* 2544 * Complete a call to either prison_free or prison_proc_free. 2545 */ 2546 static void 2547 prison_complete(void *context, int pending) 2548 { 2549 struct prison *pr = context; 2550 2551 sx_xlock(&allprison_lock); 2552 mtx_lock(&pr->pr_mtx); 2553 prison_deref(pr, pr->pr_uref 2554 ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED 2555 : PD_LOCKED | PD_LIST_XLOCKED); 2556 } 2557 2558 /* 2559 * Remove a prison reference (usually). This internal version assumes no 2560 * mutexes are held, except perhaps the prison itself. If there are no more 2561 * references, release and delist the prison. On completion, the prison lock 2562 * and the allprison lock are both unlocked. 2563 */ 2564 static void 2565 prison_deref(struct prison *pr, int flags) 2566 { 2567 struct prison *ppr, *tpr; 2568 int ref, lasturef; 2569 2570 if (!(flags & PD_LOCKED)) 2571 mtx_lock(&pr->pr_mtx); 2572 for (;;) { 2573 if (flags & PD_DEUREF) { 2574 KASSERT(pr->pr_uref > 0, 2575 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 2576 pr->pr_id)); 2577 pr->pr_uref--; 2578 lasturef = pr->pr_uref == 0; 2579 if (lasturef) 2580 pr->pr_ref++; 2581 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2582 } else 2583 lasturef = 0; 2584 if (flags & PD_DEREF) { 2585 KASSERT(pr->pr_ref > 0, 2586 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 2587 pr->pr_id)); 2588 pr->pr_ref--; 2589 } 2590 ref = pr->pr_ref; 2591 mtx_unlock(&pr->pr_mtx); 2592 2593 /* 2594 * Tell the modules if the last user reference was removed 2595 * (even it sticks around in dying state). 2596 */ 2597 if (lasturef) { 2598 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) { 2599 sx_xlock(&allprison_lock); 2600 flags |= PD_LIST_XLOCKED; 2601 } 2602 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 2603 mtx_lock(&pr->pr_mtx); 2604 ref = --pr->pr_ref; 2605 mtx_unlock(&pr->pr_mtx); 2606 } 2607 2608 /* If the prison still has references, nothing else to do. */ 2609 if (ref > 0) { 2610 if (flags & PD_LIST_SLOCKED) 2611 sx_sunlock(&allprison_lock); 2612 else if (flags & PD_LIST_XLOCKED) 2613 sx_xunlock(&allprison_lock); 2614 return; 2615 } 2616 2617 if (flags & PD_LIST_SLOCKED) { 2618 if (!sx_try_upgrade(&allprison_lock)) { 2619 sx_sunlock(&allprison_lock); 2620 sx_xlock(&allprison_lock); 2621 } 2622 } else if (!(flags & PD_LIST_XLOCKED)) 2623 sx_xlock(&allprison_lock); 2624 2625 TAILQ_REMOVE(&allprison, pr, pr_list); 2626 LIST_REMOVE(pr, pr_sibling); 2627 ppr = pr->pr_parent; 2628 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2629 tpr->pr_childcount--; 2630 sx_xunlock(&allprison_lock); 2631 2632 #ifdef VIMAGE 2633 if (pr->pr_vnet != ppr->pr_vnet) 2634 vnet_destroy(pr->pr_vnet); 2635 #endif 2636 if (pr->pr_root != NULL) 2637 vrele(pr->pr_root); 2638 mtx_destroy(&pr->pr_mtx); 2639 #ifdef INET 2640 free(pr->pr_ip4, M_PRISON); 2641 #endif 2642 #ifdef INET6 2643 free(pr->pr_ip6, M_PRISON); 2644 #endif 2645 if (pr->pr_cpuset != NULL) 2646 cpuset_rel(pr->pr_cpuset); 2647 osd_jail_exit(pr); 2648 #ifdef RACCT 2649 if (racct_enable) 2650 prison_racct_detach(pr); 2651 #endif 2652 free(pr, M_PRISON); 2653 2654 /* Removing a prison frees a reference on its parent. */ 2655 pr = ppr; 2656 mtx_lock(&pr->pr_mtx); 2657 flags = PD_DEREF | PD_DEUREF; 2658 } 2659 } 2660 2661 void 2662 prison_hold_locked(struct prison *pr) 2663 { 2664 2665 mtx_assert(&pr->pr_mtx, MA_OWNED); 2666 KASSERT(pr->pr_ref > 0, 2667 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id)); 2668 pr->pr_ref++; 2669 } 2670 2671 void 2672 prison_hold(struct prison *pr) 2673 { 2674 2675 mtx_lock(&pr->pr_mtx); 2676 prison_hold_locked(pr); 2677 mtx_unlock(&pr->pr_mtx); 2678 } 2679 2680 void 2681 prison_proc_hold(struct prison *pr) 2682 { 2683 2684 mtx_lock(&pr->pr_mtx); 2685 KASSERT(pr->pr_uref > 0, 2686 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2687 pr->pr_uref++; 2688 mtx_unlock(&pr->pr_mtx); 2689 } 2690 2691 void 2692 prison_proc_free(struct prison *pr) 2693 { 2694 2695 mtx_lock(&pr->pr_mtx); 2696 KASSERT(pr->pr_uref > 0, 2697 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2698 if (pr->pr_uref > 1) 2699 pr->pr_uref--; 2700 else { 2701 /* 2702 * Don't remove the last user reference in this context, which 2703 * is expected to be a process that is not only locked, but 2704 * also half dead. 2705 */ 2706 pr->pr_ref++; 2707 mtx_unlock(&pr->pr_mtx); 2708 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2709 return; 2710 } 2711 mtx_unlock(&pr->pr_mtx); 2712 } 2713 2714 /* 2715 * Check if a jail supports the given address family. 2716 * 2717 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 2718 * if not. 2719 */ 2720 int 2721 prison_check_af(struct ucred *cred, int af) 2722 { 2723 struct prison *pr; 2724 int error; 2725 2726 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2727 2728 pr = cred->cr_prison; 2729 #ifdef VIMAGE 2730 /* Prisons with their own network stack are not limited. */ 2731 if (prison_owns_vnet(cred)) 2732 return (0); 2733 #endif 2734 2735 error = 0; 2736 switch (af) 2737 { 2738 #ifdef INET 2739 case AF_INET: 2740 if (pr->pr_flags & PR_IP4) 2741 { 2742 mtx_lock(&pr->pr_mtx); 2743 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 2744 error = EAFNOSUPPORT; 2745 mtx_unlock(&pr->pr_mtx); 2746 } 2747 break; 2748 #endif 2749 #ifdef INET6 2750 case AF_INET6: 2751 if (pr->pr_flags & PR_IP6) 2752 { 2753 mtx_lock(&pr->pr_mtx); 2754 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 2755 error = EAFNOSUPPORT; 2756 mtx_unlock(&pr->pr_mtx); 2757 } 2758 break; 2759 #endif 2760 case AF_LOCAL: 2761 case AF_ROUTE: 2762 break; 2763 default: 2764 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 2765 error = EAFNOSUPPORT; 2766 } 2767 return (error); 2768 } 2769 2770 /* 2771 * Check if given address belongs to the jail referenced by cred (wrapper to 2772 * prison_check_ip[46]). 2773 * 2774 * Returns 0 if jail doesn't restrict the address family or if address belongs 2775 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 2776 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 2777 */ 2778 int 2779 prison_if(struct ucred *cred, struct sockaddr *sa) 2780 { 2781 #ifdef INET 2782 struct sockaddr_in *sai; 2783 #endif 2784 #ifdef INET6 2785 struct sockaddr_in6 *sai6; 2786 #endif 2787 int error; 2788 2789 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2790 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 2791 2792 #ifdef VIMAGE 2793 if (prison_owns_vnet(cred)) 2794 return (0); 2795 #endif 2796 2797 error = 0; 2798 switch (sa->sa_family) 2799 { 2800 #ifdef INET 2801 case AF_INET: 2802 sai = (struct sockaddr_in *)sa; 2803 error = prison_check_ip4(cred, &sai->sin_addr); 2804 break; 2805 #endif 2806 #ifdef INET6 2807 case AF_INET6: 2808 sai6 = (struct sockaddr_in6 *)sa; 2809 error = prison_check_ip6(cred, &sai6->sin6_addr); 2810 break; 2811 #endif 2812 default: 2813 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 2814 error = EAFNOSUPPORT; 2815 } 2816 return (error); 2817 } 2818 2819 /* 2820 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 2821 */ 2822 int 2823 prison_check(struct ucred *cred1, struct ucred *cred2) 2824 { 2825 2826 return ((cred1->cr_prison == cred2->cr_prison || 2827 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 2828 } 2829 2830 /* 2831 * Return 1 if p2 is a child of p1, otherwise 0. 2832 */ 2833 int 2834 prison_ischild(struct prison *pr1, struct prison *pr2) 2835 { 2836 2837 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 2838 if (pr1 == pr2) 2839 return (1); 2840 return (0); 2841 } 2842 2843 /* 2844 * Return 1 if the passed credential is in a jail, otherwise 0. 2845 */ 2846 int 2847 jailed(struct ucred *cred) 2848 { 2849 2850 return (cred->cr_prison != &prison0); 2851 } 2852 2853 /* 2854 * Return 1 if the passed credential is in a jail and that jail does not 2855 * have its own virtual network stack, otherwise 0. 2856 */ 2857 int 2858 jailed_without_vnet(struct ucred *cred) 2859 { 2860 2861 if (!jailed(cred)) 2862 return (0); 2863 #ifdef VIMAGE 2864 if (prison_owns_vnet(cred)) 2865 return (0); 2866 #endif 2867 2868 return (1); 2869 } 2870 2871 /* 2872 * Return the correct hostname (domainname, et al) for the passed credential. 2873 */ 2874 void 2875 getcredhostname(struct ucred *cred, char *buf, size_t size) 2876 { 2877 struct prison *pr; 2878 2879 /* 2880 * A NULL credential can be used to shortcut to the physical 2881 * system's hostname. 2882 */ 2883 pr = (cred != NULL) ? cred->cr_prison : &prison0; 2884 mtx_lock(&pr->pr_mtx); 2885 strlcpy(buf, pr->pr_hostname, size); 2886 mtx_unlock(&pr->pr_mtx); 2887 } 2888 2889 void 2890 getcreddomainname(struct ucred *cred, char *buf, size_t size) 2891 { 2892 2893 mtx_lock(&cred->cr_prison->pr_mtx); 2894 strlcpy(buf, cred->cr_prison->pr_domainname, size); 2895 mtx_unlock(&cred->cr_prison->pr_mtx); 2896 } 2897 2898 void 2899 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 2900 { 2901 2902 mtx_lock(&cred->cr_prison->pr_mtx); 2903 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 2904 mtx_unlock(&cred->cr_prison->pr_mtx); 2905 } 2906 2907 void 2908 getcredhostid(struct ucred *cred, unsigned long *hostid) 2909 { 2910 2911 mtx_lock(&cred->cr_prison->pr_mtx); 2912 *hostid = cred->cr_prison->pr_hostid; 2913 mtx_unlock(&cred->cr_prison->pr_mtx); 2914 } 2915 2916 #ifdef VIMAGE 2917 /* 2918 * Determine whether the prison represented by cred owns 2919 * its vnet rather than having it inherited. 2920 * 2921 * Returns 1 in case the prison owns the vnet, 0 otherwise. 2922 */ 2923 int 2924 prison_owns_vnet(struct ucred *cred) 2925 { 2926 2927 /* 2928 * vnets cannot be added/removed after jail creation, 2929 * so no need to lock here. 2930 */ 2931 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 2932 } 2933 #endif 2934 2935 /* 2936 * Determine whether the subject represented by cred can "see" 2937 * status of a mount point. 2938 * Returns: 0 for permitted, ENOENT otherwise. 2939 * XXX: This function should be called cr_canseemount() and should be 2940 * placed in kern_prot.c. 2941 */ 2942 int 2943 prison_canseemount(struct ucred *cred, struct mount *mp) 2944 { 2945 struct prison *pr; 2946 struct statfs *sp; 2947 size_t len; 2948 2949 pr = cred->cr_prison; 2950 if (pr->pr_enforce_statfs == 0) 2951 return (0); 2952 if (pr->pr_root->v_mount == mp) 2953 return (0); 2954 if (pr->pr_enforce_statfs == 2) 2955 return (ENOENT); 2956 /* 2957 * If jail's chroot directory is set to "/" we should be able to see 2958 * all mount-points from inside a jail. 2959 * This is ugly check, but this is the only situation when jail's 2960 * directory ends with '/'. 2961 */ 2962 if (strcmp(pr->pr_path, "/") == 0) 2963 return (0); 2964 len = strlen(pr->pr_path); 2965 sp = &mp->mnt_stat; 2966 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 2967 return (ENOENT); 2968 /* 2969 * Be sure that we don't have situation where jail's root directory 2970 * is "/some/path" and mount point is "/some/pathpath". 2971 */ 2972 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 2973 return (ENOENT); 2974 return (0); 2975 } 2976 2977 void 2978 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 2979 { 2980 char jpath[MAXPATHLEN]; 2981 struct prison *pr; 2982 size_t len; 2983 2984 pr = cred->cr_prison; 2985 if (pr->pr_enforce_statfs == 0) 2986 return; 2987 if (prison_canseemount(cred, mp) != 0) { 2988 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 2989 strlcpy(sp->f_mntonname, "[restricted]", 2990 sizeof(sp->f_mntonname)); 2991 return; 2992 } 2993 if (pr->pr_root->v_mount == mp) { 2994 /* 2995 * Clear current buffer data, so we are sure nothing from 2996 * the valid path left there. 2997 */ 2998 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 2999 *sp->f_mntonname = '/'; 3000 return; 3001 } 3002 /* 3003 * If jail's chroot directory is set to "/" we should be able to see 3004 * all mount-points from inside a jail. 3005 */ 3006 if (strcmp(pr->pr_path, "/") == 0) 3007 return; 3008 len = strlen(pr->pr_path); 3009 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3010 /* 3011 * Clear current buffer data, so we are sure nothing from 3012 * the valid path left there. 3013 */ 3014 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3015 if (*jpath == '\0') { 3016 /* Should never happen. */ 3017 *sp->f_mntonname = '/'; 3018 } else { 3019 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3020 } 3021 } 3022 3023 /* 3024 * Check with permission for a specific privilege is granted within jail. We 3025 * have a specific list of accepted privileges; the rest are denied. 3026 */ 3027 int 3028 prison_priv_check(struct ucred *cred, int priv) 3029 { 3030 3031 if (!jailed(cred)) 3032 return (0); 3033 3034 #ifdef VIMAGE 3035 /* 3036 * Privileges specific to prisons with a virtual network stack. 3037 * There might be a duplicate entry here in case the privilege 3038 * is only granted conditionally in the legacy jail case. 3039 */ 3040 switch (priv) { 3041 #ifdef notyet 3042 /* 3043 * NFS-specific privileges. 3044 */ 3045 case PRIV_NFS_DAEMON: 3046 case PRIV_NFS_LOCKD: 3047 #endif 3048 /* 3049 * Network stack privileges. 3050 */ 3051 case PRIV_NET_BRIDGE: 3052 case PRIV_NET_GRE: 3053 case PRIV_NET_BPF: 3054 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3055 case PRIV_NET_ROUTE: 3056 case PRIV_NET_TAP: 3057 case PRIV_NET_SETIFMTU: 3058 case PRIV_NET_SETIFFLAGS: 3059 case PRIV_NET_SETIFCAP: 3060 case PRIV_NET_SETIFDESCR: 3061 case PRIV_NET_SETIFNAME : 3062 case PRIV_NET_SETIFMETRIC: 3063 case PRIV_NET_SETIFPHYS: 3064 case PRIV_NET_SETIFMAC: 3065 case PRIV_NET_SETLANPCP: 3066 case PRIV_NET_ADDMULTI: 3067 case PRIV_NET_DELMULTI: 3068 case PRIV_NET_HWIOCTL: 3069 case PRIV_NET_SETLLADDR: 3070 case PRIV_NET_ADDIFGROUP: 3071 case PRIV_NET_DELIFGROUP: 3072 case PRIV_NET_IFCREATE: 3073 case PRIV_NET_IFDESTROY: 3074 case PRIV_NET_ADDIFADDR: 3075 case PRIV_NET_DELIFADDR: 3076 case PRIV_NET_LAGG: 3077 case PRIV_NET_GIF: 3078 case PRIV_NET_SETIFVNET: 3079 case PRIV_NET_SETIFFIB: 3080 3081 /* 3082 * 802.11-related privileges. 3083 */ 3084 case PRIV_NET80211_GETKEY: 3085 #ifdef notyet 3086 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3087 #endif 3088 3089 #ifdef notyet 3090 /* 3091 * ATM privileges. 3092 */ 3093 case PRIV_NETATM_CFG: 3094 case PRIV_NETATM_ADD: 3095 case PRIV_NETATM_DEL: 3096 case PRIV_NETATM_SET: 3097 3098 /* 3099 * Bluetooth privileges. 3100 */ 3101 case PRIV_NETBLUETOOTH_RAW: 3102 #endif 3103 3104 /* 3105 * Netgraph and netgraph module privileges. 3106 */ 3107 case PRIV_NETGRAPH_CONTROL: 3108 #ifdef notyet 3109 case PRIV_NETGRAPH_TTY: 3110 #endif 3111 3112 /* 3113 * IPv4 and IPv6 privileges. 3114 */ 3115 case PRIV_NETINET_IPFW: 3116 case PRIV_NETINET_DIVERT: 3117 case PRIV_NETINET_PF: 3118 case PRIV_NETINET_DUMMYNET: 3119 case PRIV_NETINET_CARP: 3120 case PRIV_NETINET_MROUTE: 3121 case PRIV_NETINET_RAW: 3122 case PRIV_NETINET_ADDRCTRL6: 3123 case PRIV_NETINET_ND6: 3124 case PRIV_NETINET_SCOPE6: 3125 case PRIV_NETINET_ALIFETIME6: 3126 case PRIV_NETINET_IPSEC: 3127 case PRIV_NETINET_BINDANY: 3128 3129 #ifdef notyet 3130 /* 3131 * NCP privileges. 3132 */ 3133 case PRIV_NETNCP: 3134 3135 /* 3136 * SMB privileges. 3137 */ 3138 case PRIV_NETSMB: 3139 #endif 3140 3141 /* 3142 * No default: or deny here. 3143 * In case of no permit fall through to next switch(). 3144 */ 3145 if (cred->cr_prison->pr_flags & PR_VNET) 3146 return (0); 3147 } 3148 #endif /* VIMAGE */ 3149 3150 switch (priv) { 3151 3152 /* 3153 * Allow ktrace privileges for root in jail. 3154 */ 3155 case PRIV_KTRACE: 3156 3157 #if 0 3158 /* 3159 * Allow jailed processes to configure audit identity and 3160 * submit audit records (login, etc). In the future we may 3161 * want to further refine the relationship between audit and 3162 * jail. 3163 */ 3164 case PRIV_AUDIT_GETAUDIT: 3165 case PRIV_AUDIT_SETAUDIT: 3166 case PRIV_AUDIT_SUBMIT: 3167 #endif 3168 3169 /* 3170 * Allow jailed processes to manipulate process UNIX 3171 * credentials in any way they see fit. 3172 */ 3173 case PRIV_CRED_SETUID: 3174 case PRIV_CRED_SETEUID: 3175 case PRIV_CRED_SETGID: 3176 case PRIV_CRED_SETEGID: 3177 case PRIV_CRED_SETGROUPS: 3178 case PRIV_CRED_SETREUID: 3179 case PRIV_CRED_SETREGID: 3180 case PRIV_CRED_SETRESUID: 3181 case PRIV_CRED_SETRESGID: 3182 3183 /* 3184 * Jail implements visibility constraints already, so allow 3185 * jailed root to override uid/gid-based constraints. 3186 */ 3187 case PRIV_SEEOTHERGIDS: 3188 case PRIV_SEEOTHERUIDS: 3189 3190 /* 3191 * Jail implements inter-process debugging limits already, so 3192 * allow jailed root various debugging privileges. 3193 */ 3194 case PRIV_DEBUG_DIFFCRED: 3195 case PRIV_DEBUG_SUGID: 3196 case PRIV_DEBUG_UNPRIV: 3197 3198 /* 3199 * Allow jail to set various resource limits and login 3200 * properties, and for now, exceed process resource limits. 3201 */ 3202 case PRIV_PROC_LIMIT: 3203 case PRIV_PROC_SETLOGIN: 3204 case PRIV_PROC_SETRLIMIT: 3205 3206 /* 3207 * System V and POSIX IPC privileges are granted in jail. 3208 */ 3209 case PRIV_IPC_READ: 3210 case PRIV_IPC_WRITE: 3211 case PRIV_IPC_ADMIN: 3212 case PRIV_IPC_MSGSIZE: 3213 case PRIV_MQ_ADMIN: 3214 3215 /* 3216 * Jail operations within a jail work on child jails. 3217 */ 3218 case PRIV_JAIL_ATTACH: 3219 case PRIV_JAIL_SET: 3220 case PRIV_JAIL_REMOVE: 3221 3222 /* 3223 * Jail implements its own inter-process limits, so allow 3224 * root processes in jail to change scheduling on other 3225 * processes in the same jail. Likewise for signalling. 3226 */ 3227 case PRIV_SCHED_DIFFCRED: 3228 case PRIV_SCHED_CPUSET: 3229 case PRIV_SIGNAL_DIFFCRED: 3230 case PRIV_SIGNAL_SUGID: 3231 3232 /* 3233 * Allow jailed processes to write to sysctls marked as jail 3234 * writable. 3235 */ 3236 case PRIV_SYSCTL_WRITEJAIL: 3237 3238 /* 3239 * Allow root in jail to manage a variety of quota 3240 * properties. These should likely be conditional on a 3241 * configuration option. 3242 */ 3243 case PRIV_VFS_GETQUOTA: 3244 case PRIV_VFS_SETQUOTA: 3245 3246 /* 3247 * Since Jail relies on chroot() to implement file system 3248 * protections, grant many VFS privileges to root in jail. 3249 * Be careful to exclude mount-related and NFS-related 3250 * privileges. 3251 */ 3252 case PRIV_VFS_READ: 3253 case PRIV_VFS_WRITE: 3254 case PRIV_VFS_ADMIN: 3255 case PRIV_VFS_EXEC: 3256 case PRIV_VFS_LOOKUP: 3257 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3258 case PRIV_VFS_CHFLAGS_DEV: 3259 case PRIV_VFS_CHOWN: 3260 case PRIV_VFS_CHROOT: 3261 case PRIV_VFS_RETAINSUGID: 3262 case PRIV_VFS_FCHROOT: 3263 case PRIV_VFS_LINK: 3264 case PRIV_VFS_SETGID: 3265 case PRIV_VFS_STAT: 3266 case PRIV_VFS_STICKYFILE: 3267 3268 /* 3269 * As in the non-jail case, non-root users are expected to be 3270 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3271 * exists in the jail and they have permission to access it). 3272 */ 3273 case PRIV_KMEM_READ: 3274 return (0); 3275 3276 /* 3277 * Depending on the global setting, allow privilege of 3278 * setting system flags. 3279 */ 3280 case PRIV_VFS_SYSFLAGS: 3281 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3282 return (0); 3283 else 3284 return (EPERM); 3285 3286 /* 3287 * Depending on the global setting, allow privilege of 3288 * mounting/unmounting file systems. 3289 */ 3290 case PRIV_VFS_MOUNT: 3291 case PRIV_VFS_UNMOUNT: 3292 case PRIV_VFS_MOUNT_NONUSER: 3293 case PRIV_VFS_MOUNT_OWNER: 3294 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3295 cred->cr_prison->pr_enforce_statfs < 2) 3296 return (0); 3297 else 3298 return (EPERM); 3299 3300 /* 3301 * Conditionnaly allow locking (unlocking) physical pages 3302 * in memory. 3303 */ 3304 case PRIV_VM_MLOCK: 3305 case PRIV_VM_MUNLOCK: 3306 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK) 3307 return (0); 3308 else 3309 return (EPERM); 3310 3311 /* 3312 * Conditionally allow jailed root to bind reserved ports. 3313 */ 3314 case PRIV_NETINET_RESERVEDPORT: 3315 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS) 3316 return (0); 3317 else 3318 return (EPERM); 3319 3320 /* 3321 * Allow jailed root to reuse in-use ports. 3322 */ 3323 case PRIV_NETINET_REUSEPORT: 3324 return (0); 3325 3326 /* 3327 * Allow jailed root to set certain IPv4/6 (option) headers. 3328 */ 3329 case PRIV_NETINET_SETHDROPTS: 3330 return (0); 3331 3332 /* 3333 * Conditionally allow creating raw sockets in jail. 3334 */ 3335 case PRIV_NETINET_RAW: 3336 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3337 return (0); 3338 else 3339 return (EPERM); 3340 3341 /* 3342 * Since jail implements its own visibility limits on netstat 3343 * sysctls, allow getcred. This allows identd to work in 3344 * jail. 3345 */ 3346 case PRIV_NETINET_GETCRED: 3347 return (0); 3348 3349 /* 3350 * Allow jailed root to set loginclass. 3351 */ 3352 case PRIV_PROC_SETLOGINCLASS: 3353 return (0); 3354 3355 /* 3356 * Do not allow a process inside a jail to read the kernel 3357 * message buffer unless explicitly permitted. 3358 */ 3359 case PRIV_MSGBUF: 3360 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF) 3361 return (0); 3362 return (EPERM); 3363 3364 default: 3365 /* 3366 * In all remaining cases, deny the privilege request. This 3367 * includes almost all network privileges, many system 3368 * configuration privileges. 3369 */ 3370 return (EPERM); 3371 } 3372 } 3373 3374 /* 3375 * Return the part of pr2's name that is relative to pr1, or the whole name 3376 * if it does not directly follow. 3377 */ 3378 3379 char * 3380 prison_name(struct prison *pr1, struct prison *pr2) 3381 { 3382 char *name; 3383 3384 /* Jails see themselves as "" (if they see themselves at all). */ 3385 if (pr1 == pr2) 3386 return ""; 3387 name = pr2->pr_name; 3388 if (prison_ischild(pr1, pr2)) { 3389 /* 3390 * pr1 isn't locked (and allprison_lock may not be either) 3391 * so its length can't be counted on. But the number of dots 3392 * can be counted on - and counted. 3393 */ 3394 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3395 name = strchr(name, '.') + 1; 3396 } 3397 return (name); 3398 } 3399 3400 /* 3401 * Return the part of pr2's path that is relative to pr1, or the whole path 3402 * if it does not directly follow. 3403 */ 3404 static char * 3405 prison_path(struct prison *pr1, struct prison *pr2) 3406 { 3407 char *path1, *path2; 3408 int len1; 3409 3410 path1 = pr1->pr_path; 3411 path2 = pr2->pr_path; 3412 if (!strcmp(path1, "/")) 3413 return (path2); 3414 len1 = strlen(path1); 3415 if (strncmp(path1, path2, len1)) 3416 return (path2); 3417 if (path2[len1] == '\0') 3418 return "/"; 3419 if (path2[len1] == '/') 3420 return (path2 + len1); 3421 return (path2); 3422 } 3423 3424 3425 /* 3426 * Jail-related sysctls. 3427 */ 3428 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 3429 "Jails"); 3430 3431 static int 3432 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3433 { 3434 struct xprison *xp; 3435 struct prison *pr, *cpr; 3436 #ifdef INET 3437 struct in_addr *ip4 = NULL; 3438 int ip4s = 0; 3439 #endif 3440 #ifdef INET6 3441 struct in6_addr *ip6 = NULL; 3442 int ip6s = 0; 3443 #endif 3444 int descend, error; 3445 3446 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3447 pr = req->td->td_ucred->cr_prison; 3448 error = 0; 3449 sx_slock(&allprison_lock); 3450 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3451 #if defined(INET) || defined(INET6) 3452 again: 3453 #endif 3454 mtx_lock(&cpr->pr_mtx); 3455 #ifdef INET 3456 if (cpr->pr_ip4s > 0) { 3457 if (ip4s < cpr->pr_ip4s) { 3458 ip4s = cpr->pr_ip4s; 3459 mtx_unlock(&cpr->pr_mtx); 3460 ip4 = realloc(ip4, ip4s * 3461 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3462 goto again; 3463 } 3464 bcopy(cpr->pr_ip4, ip4, 3465 cpr->pr_ip4s * sizeof(struct in_addr)); 3466 } 3467 #endif 3468 #ifdef INET6 3469 if (cpr->pr_ip6s > 0) { 3470 if (ip6s < cpr->pr_ip6s) { 3471 ip6s = cpr->pr_ip6s; 3472 mtx_unlock(&cpr->pr_mtx); 3473 ip6 = realloc(ip6, ip6s * 3474 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 3475 goto again; 3476 } 3477 bcopy(cpr->pr_ip6, ip6, 3478 cpr->pr_ip6s * sizeof(struct in6_addr)); 3479 } 3480 #endif 3481 if (cpr->pr_ref == 0) { 3482 mtx_unlock(&cpr->pr_mtx); 3483 continue; 3484 } 3485 bzero(xp, sizeof(*xp)); 3486 xp->pr_version = XPRISON_VERSION; 3487 xp->pr_id = cpr->pr_id; 3488 xp->pr_state = cpr->pr_uref > 0 3489 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 3490 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 3491 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 3492 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 3493 #ifdef INET 3494 xp->pr_ip4s = cpr->pr_ip4s; 3495 #endif 3496 #ifdef INET6 3497 xp->pr_ip6s = cpr->pr_ip6s; 3498 #endif 3499 mtx_unlock(&cpr->pr_mtx); 3500 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 3501 if (error) 3502 break; 3503 #ifdef INET 3504 if (xp->pr_ip4s > 0) { 3505 error = SYSCTL_OUT(req, ip4, 3506 xp->pr_ip4s * sizeof(struct in_addr)); 3507 if (error) 3508 break; 3509 } 3510 #endif 3511 #ifdef INET6 3512 if (xp->pr_ip6s > 0) { 3513 error = SYSCTL_OUT(req, ip6, 3514 xp->pr_ip6s * sizeof(struct in6_addr)); 3515 if (error) 3516 break; 3517 } 3518 #endif 3519 } 3520 sx_sunlock(&allprison_lock); 3521 free(xp, M_TEMP); 3522 #ifdef INET 3523 free(ip4, M_TEMP); 3524 #endif 3525 #ifdef INET6 3526 free(ip6, M_TEMP); 3527 #endif 3528 return (error); 3529 } 3530 3531 SYSCTL_OID(_security_jail, OID_AUTO, list, 3532 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3533 sysctl_jail_list, "S", "List of active jails"); 3534 3535 static int 3536 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 3537 { 3538 int error, injail; 3539 3540 injail = jailed(req->td->td_ucred); 3541 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 3542 3543 return (error); 3544 } 3545 3546 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 3547 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3548 sysctl_jail_jailed, "I", "Process in jail?"); 3549 3550 static int 3551 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 3552 { 3553 int error, havevnet; 3554 #ifdef VIMAGE 3555 struct ucred *cred = req->td->td_ucred; 3556 3557 havevnet = jailed(cred) && prison_owns_vnet(cred); 3558 #else 3559 havevnet = 0; 3560 #endif 3561 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 3562 3563 return (error); 3564 } 3565 3566 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 3567 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3568 sysctl_jail_vnet, "I", "Jail owns vnet?"); 3569 3570 #if defined(INET) || defined(INET6) 3571 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 3572 &jail_max_af_ips, 0, 3573 "Number of IP addresses a jail may have at most per address family (deprecated)"); 3574 #endif 3575 3576 /* 3577 * Default parameters for jail(2) compatibility. For historical reasons, 3578 * the sysctl names have varying similarity to the parameter names. Prisons 3579 * just see their own parameters, and can't change them. 3580 */ 3581 static int 3582 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 3583 { 3584 struct prison *pr; 3585 int allow, error, i; 3586 3587 pr = req->td->td_ucred->cr_prison; 3588 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 3589 3590 /* Get the current flag value, and convert it to a boolean. */ 3591 i = (allow & arg2) ? 1 : 0; 3592 if (arg1 != NULL) 3593 i = !i; 3594 error = sysctl_handle_int(oidp, &i, 0, req); 3595 if (error || !req->newptr) 3596 return (error); 3597 i = i ? arg2 : 0; 3598 if (arg1 != NULL) 3599 i ^= arg2; 3600 /* 3601 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 3602 * for writing. 3603 */ 3604 mtx_lock(&prison0.pr_mtx); 3605 jail_default_allow = (jail_default_allow & ~arg2) | i; 3606 mtx_unlock(&prison0.pr_mtx); 3607 return (0); 3608 } 3609 3610 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 3611 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3612 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 3613 "Processes in jail can set their hostnames (deprecated)"); 3614 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 3615 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3616 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 3617 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 3618 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 3619 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3620 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 3621 "Processes in jail can use System V IPC primitives (deprecated)"); 3622 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 3623 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3624 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 3625 "Prison root can create raw sockets (deprecated)"); 3626 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 3627 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3628 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 3629 "Processes in jail can alter system file flags (deprecated)"); 3630 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 3631 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3632 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 3633 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 3634 3635 static int 3636 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 3637 { 3638 struct prison *pr; 3639 int level, error; 3640 3641 pr = req->td->td_ucred->cr_prison; 3642 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 3643 error = sysctl_handle_int(oidp, &level, 0, req); 3644 if (error || !req->newptr) 3645 return (error); 3646 *(int *)arg1 = level; 3647 return (0); 3648 } 3649 3650 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 3651 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3652 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 3653 sysctl_jail_default_level, "I", 3654 "Processes in jail cannot see all mounted file systems (deprecated)"); 3655 3656 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 3657 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 3658 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 3659 sysctl_jail_default_level, "I", 3660 "Ruleset for the devfs filesystem in jail (deprecated)"); 3661 3662 /* 3663 * Nodes to describe jail parameters. Maximum length of string parameters 3664 * is returned in the string itself, and the other parameters exist merely 3665 * to make themselves and their types known. 3666 */ 3667 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 3668 "Jail parameters"); 3669 3670 int 3671 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 3672 { 3673 int i; 3674 long l; 3675 size_t s; 3676 char numbuf[12]; 3677 3678 switch (oidp->oid_kind & CTLTYPE) 3679 { 3680 case CTLTYPE_LONG: 3681 case CTLTYPE_ULONG: 3682 l = 0; 3683 #ifdef SCTL_MASK32 3684 if (!(req->flags & SCTL_MASK32)) 3685 #endif 3686 return (SYSCTL_OUT(req, &l, sizeof(l))); 3687 case CTLTYPE_INT: 3688 case CTLTYPE_UINT: 3689 i = 0; 3690 return (SYSCTL_OUT(req, &i, sizeof(i))); 3691 case CTLTYPE_STRING: 3692 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 3693 return 3694 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 3695 case CTLTYPE_STRUCT: 3696 s = (size_t)arg2; 3697 return (SYSCTL_OUT(req, &s, sizeof(s))); 3698 } 3699 return (0); 3700 } 3701 3702 /* 3703 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 3704 * jail creation time but cannot be changed in an existing jail. 3705 */ 3706 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 3707 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 3708 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 3709 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 3710 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 3711 "I", "Jail secure level"); 3712 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 3713 "Jail value for kern.osreldate and uname -K"); 3714 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 3715 "Jail value for kern.osrelease and uname -r"); 3716 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 3717 "I", "Jail cannot see all mounted file systems"); 3718 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 3719 "I", "Ruleset for in-jail devfs mounts"); 3720 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 3721 "B", "Jail persistence"); 3722 #ifdef VIMAGE 3723 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 3724 "E,jailsys", "Virtual network stack"); 3725 #endif 3726 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 3727 "B", "Jail is in the process of shutting down"); 3728 3729 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 3730 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 3731 "I", "Current number of child jails"); 3732 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 3733 "I", "Maximum number of child jails"); 3734 3735 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 3736 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 3737 "Jail hostname"); 3738 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 3739 "Jail NIS domainname"); 3740 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 3741 "Jail host UUID"); 3742 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 3743 "LU", "Jail host ID"); 3744 3745 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 3746 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 3747 3748 #ifdef INET 3749 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 3750 "Jail IPv4 address virtualization"); 3751 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 3752 "S,in_addr,a", "Jail IPv4 addresses"); 3753 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3754 "B", "Do (not) use IPv4 source address selection rather than the " 3755 "primary jail IPv4 address."); 3756 #endif 3757 #ifdef INET6 3758 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 3759 "Jail IPv6 address virtualization"); 3760 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 3761 "S,in6_addr,a", "Jail IPv6 addresses"); 3762 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3763 "B", "Do (not) use IPv6 source address selection rather than the " 3764 "primary jail IPv6 address."); 3765 #endif 3766 3767 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 3768 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 3769 "B", "Jail may set hostname"); 3770 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 3771 "B", "Jail may use SYSV IPC"); 3772 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 3773 "B", "Jail may create raw sockets"); 3774 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 3775 "B", "Jail may alter system file flags"); 3776 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 3777 "B", "Jail may set file quotas"); 3778 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 3779 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 3780 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW, 3781 "B", "Jail may lock (unlock) physical pages in memory"); 3782 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW, 3783 "B", "Jail may bind sockets to reserved ports"); 3784 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW, 3785 "B", "Jail may read the kernel message buffer"); 3786 3787 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 3788 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 3789 "B", "Jail may mount/unmount jail-friendly file systems in general"); 3790 3791 /* 3792 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return 3793 * its associated bit in the pr_allow bitmask, or zero if the parameter was 3794 * not created. 3795 */ 3796 unsigned 3797 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr, 3798 const char *descr) 3799 { 3800 struct bool_flags *bf; 3801 struct sysctl_oid *parent; 3802 char *allow_name, *allow_noname, *allowed; 3803 #ifndef NO_SYSCTL_DESCR 3804 char *descr_deprecated; 3805 #endif 3806 unsigned allow_flag; 3807 3808 if (prefix 3809 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name) 3810 < 0 || 3811 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name) 3812 < 0 3813 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 || 3814 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) { 3815 free(allow_name, M_PRISON); 3816 return 0; 3817 } 3818 3819 /* 3820 * See if this parameter has already beed added, i.e. a module was 3821 * previously loaded/unloaded. 3822 */ 3823 mtx_lock(&prison0.pr_mtx); 3824 for (bf = pr_flag_allow; 3825 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 3826 bf++) { 3827 if (strcmp(bf->name, allow_name) == 0) { 3828 allow_flag = bf->flag; 3829 goto no_add; 3830 } 3831 } 3832 3833 /* 3834 * Find a free bit in prison0's pr_allow, failing if there are none 3835 * (which shouldn't happen as long as we keep track of how many 3836 * potential dynamic flags exist). 3837 */ 3838 for (allow_flag = 1;; allow_flag <<= 1) { 3839 if (allow_flag == 0) 3840 goto no_add; 3841 if ((prison0.pr_allow & allow_flag) == 0) 3842 break; 3843 } 3844 3845 /* 3846 * Note the parameter in the next open slot in pr_flag_allow. 3847 * Set the flag last so code that checks pr_flag_allow can do so 3848 * without locking. 3849 */ 3850 for (bf = pr_flag_allow; bf->flag != 0; bf++) 3851 if (bf == pr_flag_allow + nitems(pr_flag_allow)) { 3852 /* This should never happen, but is not fatal. */ 3853 allow_flag = 0; 3854 goto no_add; 3855 } 3856 prison0.pr_allow |= allow_flag; 3857 bf->name = allow_name; 3858 bf->noname = allow_noname; 3859 bf->flag = allow_flag; 3860 mtx_unlock(&prison0.pr_mtx); 3861 3862 /* 3863 * Create sysctls for the paramter, and the back-compat global 3864 * permission. 3865 */ 3866 parent = prefix 3867 ? SYSCTL_ADD_NODE(NULL, 3868 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow), 3869 OID_AUTO, prefix, 0, 0, prefix_descr) 3870 : &sysctl___security_jail_param_allow; 3871 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO, 3872 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3873 NULL, 0, sysctl_jail_param, "B", descr); 3874 if ((prefix 3875 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name) 3876 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) { 3877 #ifndef NO_SYSCTL_DESCR 3878 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)", 3879 descr); 3880 #endif 3881 (void)SYSCTL_ADD_PROC(NULL, 3882 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed, 3883 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag, 3884 sysctl_jail_default_allow, "I", descr_deprecated); 3885 #ifndef NO_SYSCTL_DESCR 3886 free(descr_deprecated, M_TEMP); 3887 #endif 3888 free(allowed, M_TEMP); 3889 } 3890 return allow_flag; 3891 3892 no_add: 3893 mtx_unlock(&prison0.pr_mtx); 3894 free(allow_name, M_PRISON); 3895 free(allow_noname, M_PRISON); 3896 return allow_flag; 3897 } 3898 3899 /* 3900 * The VFS system will register jail-aware filesystems here. They each get 3901 * a parameter allow.mount.xxxfs and a flag to check when a jailed user 3902 * attempts to mount. 3903 */ 3904 void 3905 prison_add_vfs(struct vfsconf *vfsp) 3906 { 3907 #ifdef NO_SYSCTL_DESCR 3908 3909 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 3910 NULL, NULL); 3911 #else 3912 char *descr; 3913 3914 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system", 3915 vfsp->vfc_name); 3916 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 3917 NULL, descr); 3918 free(descr, M_TEMP); 3919 #endif 3920 } 3921 3922 #ifdef RACCT 3923 void 3924 prison_racct_foreach(void (*callback)(struct racct *racct, 3925 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 3926 void *arg2, void *arg3) 3927 { 3928 struct prison_racct *prr; 3929 3930 ASSERT_RACCT_ENABLED(); 3931 3932 sx_slock(&allprison_lock); 3933 if (pre != NULL) 3934 (pre)(); 3935 LIST_FOREACH(prr, &allprison_racct, prr_next) 3936 (callback)(prr->prr_racct, arg2, arg3); 3937 if (post != NULL) 3938 (post)(); 3939 sx_sunlock(&allprison_lock); 3940 } 3941 3942 static struct prison_racct * 3943 prison_racct_find_locked(const char *name) 3944 { 3945 struct prison_racct *prr; 3946 3947 ASSERT_RACCT_ENABLED(); 3948 sx_assert(&allprison_lock, SA_XLOCKED); 3949 3950 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 3951 return (NULL); 3952 3953 LIST_FOREACH(prr, &allprison_racct, prr_next) { 3954 if (strcmp(name, prr->prr_name) != 0) 3955 continue; 3956 3957 /* Found prison_racct with a matching name? */ 3958 prison_racct_hold(prr); 3959 return (prr); 3960 } 3961 3962 /* Add new prison_racct. */ 3963 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 3964 racct_create(&prr->prr_racct); 3965 3966 strcpy(prr->prr_name, name); 3967 refcount_init(&prr->prr_refcount, 1); 3968 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 3969 3970 return (prr); 3971 } 3972 3973 struct prison_racct * 3974 prison_racct_find(const char *name) 3975 { 3976 struct prison_racct *prr; 3977 3978 ASSERT_RACCT_ENABLED(); 3979 3980 sx_xlock(&allprison_lock); 3981 prr = prison_racct_find_locked(name); 3982 sx_xunlock(&allprison_lock); 3983 return (prr); 3984 } 3985 3986 void 3987 prison_racct_hold(struct prison_racct *prr) 3988 { 3989 3990 ASSERT_RACCT_ENABLED(); 3991 3992 refcount_acquire(&prr->prr_refcount); 3993 } 3994 3995 static void 3996 prison_racct_free_locked(struct prison_racct *prr) 3997 { 3998 3999 ASSERT_RACCT_ENABLED(); 4000 sx_assert(&allprison_lock, SA_XLOCKED); 4001 4002 if (refcount_release(&prr->prr_refcount)) { 4003 racct_destroy(&prr->prr_racct); 4004 LIST_REMOVE(prr, prr_next); 4005 free(prr, M_PRISON_RACCT); 4006 } 4007 } 4008 4009 void 4010 prison_racct_free(struct prison_racct *prr) 4011 { 4012 int old; 4013 4014 ASSERT_RACCT_ENABLED(); 4015 sx_assert(&allprison_lock, SA_UNLOCKED); 4016 4017 old = prr->prr_refcount; 4018 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4019 return; 4020 4021 sx_xlock(&allprison_lock); 4022 prison_racct_free_locked(prr); 4023 sx_xunlock(&allprison_lock); 4024 } 4025 4026 static void 4027 prison_racct_attach(struct prison *pr) 4028 { 4029 struct prison_racct *prr; 4030 4031 ASSERT_RACCT_ENABLED(); 4032 sx_assert(&allprison_lock, SA_XLOCKED); 4033 4034 prr = prison_racct_find_locked(pr->pr_name); 4035 KASSERT(prr != NULL, ("cannot find prison_racct")); 4036 4037 pr->pr_prison_racct = prr; 4038 } 4039 4040 /* 4041 * Handle jail renaming. From the racct point of view, renaming means 4042 * moving from one prison_racct to another. 4043 */ 4044 static void 4045 prison_racct_modify(struct prison *pr) 4046 { 4047 #ifdef RCTL 4048 struct proc *p; 4049 struct ucred *cred; 4050 #endif 4051 struct prison_racct *oldprr; 4052 4053 ASSERT_RACCT_ENABLED(); 4054 4055 sx_slock(&allproc_lock); 4056 sx_xlock(&allprison_lock); 4057 4058 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4059 sx_xunlock(&allprison_lock); 4060 sx_sunlock(&allproc_lock); 4061 return; 4062 } 4063 4064 oldprr = pr->pr_prison_racct; 4065 pr->pr_prison_racct = NULL; 4066 4067 prison_racct_attach(pr); 4068 4069 /* 4070 * Move resource utilisation records. 4071 */ 4072 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4073 4074 #ifdef RCTL 4075 /* 4076 * Force rctl to reattach rules to processes. 4077 */ 4078 FOREACH_PROC_IN_SYSTEM(p) { 4079 PROC_LOCK(p); 4080 cred = crhold(p->p_ucred); 4081 PROC_UNLOCK(p); 4082 rctl_proc_ucred_changed(p, cred); 4083 crfree(cred); 4084 } 4085 #endif 4086 4087 sx_sunlock(&allproc_lock); 4088 prison_racct_free_locked(oldprr); 4089 sx_xunlock(&allprison_lock); 4090 } 4091 4092 static void 4093 prison_racct_detach(struct prison *pr) 4094 { 4095 4096 ASSERT_RACCT_ENABLED(); 4097 sx_assert(&allprison_lock, SA_UNLOCKED); 4098 4099 if (pr->pr_prison_racct == NULL) 4100 return; 4101 prison_racct_free(pr->pr_prison_racct); 4102 pr->pr_prison_racct = NULL; 4103 } 4104 #endif /* RACCT */ 4105 4106 #ifdef DDB 4107 4108 static void 4109 db_show_prison(struct prison *pr) 4110 { 4111 struct bool_flags *bf; 4112 struct jailsys_flags *jsf; 4113 #if defined(INET) || defined(INET6) 4114 int ii; 4115 #endif 4116 unsigned f; 4117 #ifdef INET 4118 char ip4buf[INET_ADDRSTRLEN]; 4119 #endif 4120 #ifdef INET6 4121 char ip6buf[INET6_ADDRSTRLEN]; 4122 #endif 4123 4124 db_printf("prison %p:\n", pr); 4125 db_printf(" jid = %d\n", pr->pr_id); 4126 db_printf(" name = %s\n", pr->pr_name); 4127 db_printf(" parent = %p\n", pr->pr_parent); 4128 db_printf(" ref = %d\n", pr->pr_ref); 4129 db_printf(" uref = %d\n", pr->pr_uref); 4130 db_printf(" path = %s\n", pr->pr_path); 4131 db_printf(" cpuset = %d\n", pr->pr_cpuset 4132 ? pr->pr_cpuset->cs_id : -1); 4133 #ifdef VIMAGE 4134 db_printf(" vnet = %p\n", pr->pr_vnet); 4135 #endif 4136 db_printf(" root = %p\n", pr->pr_root); 4137 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4138 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4139 db_printf(" children.max = %d\n", pr->pr_childmax); 4140 db_printf(" children.cur = %d\n", pr->pr_childcount); 4141 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4142 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4143 db_printf(" flags = 0x%x", pr->pr_flags); 4144 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++) 4145 if (pr->pr_flags & bf->flag) 4146 db_printf(" %s", bf->name); 4147 for (jsf = pr_flag_jailsys; 4148 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 4149 jsf++) { 4150 f = pr->pr_flags & (jsf->disable | jsf->new); 4151 db_printf(" %-16s= %s\n", jsf->name, 4152 (f != 0 && f == jsf->disable) ? "disable" 4153 : (f == jsf->new) ? "new" 4154 : "inherit"); 4155 } 4156 db_printf(" allow = 0x%x", pr->pr_allow); 4157 for (bf = pr_flag_allow; 4158 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0; 4159 bf++) 4160 if (pr->pr_allow & bf->flag) 4161 db_printf(" %s", bf->name); 4162 db_printf("\n"); 4163 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4164 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4165 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4166 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4167 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4168 #ifdef INET 4169 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4170 for (ii = 0; ii < pr->pr_ip4s; ii++) 4171 db_printf(" %s %s\n", 4172 ii == 0 ? "ip4.addr =" : " ", 4173 inet_ntoa_r(pr->pr_ip4[ii], ip4buf)); 4174 #endif 4175 #ifdef INET6 4176 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4177 for (ii = 0; ii < pr->pr_ip6s; ii++) 4178 db_printf(" %s %s\n", 4179 ii == 0 ? "ip6.addr =" : " ", 4180 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4181 #endif 4182 } 4183 4184 DB_SHOW_COMMAND(prison, db_show_prison_command) 4185 { 4186 struct prison *pr; 4187 4188 if (!have_addr) { 4189 /* 4190 * Show all prisons in the list, and prison0 which is not 4191 * listed. 4192 */ 4193 db_show_prison(&prison0); 4194 if (!db_pager_quit) { 4195 TAILQ_FOREACH(pr, &allprison, pr_list) { 4196 db_show_prison(pr); 4197 if (db_pager_quit) 4198 break; 4199 } 4200 } 4201 return; 4202 } 4203 4204 if (addr == 0) 4205 pr = &prison0; 4206 else { 4207 /* Look for a prison with the ID and with references. */ 4208 TAILQ_FOREACH(pr, &allprison, pr_list) 4209 if (pr->pr_id == addr && pr->pr_ref > 0) 4210 break; 4211 if (pr == NULL) 4212 /* Look again, without requiring a reference. */ 4213 TAILQ_FOREACH(pr, &allprison, pr_list) 4214 if (pr->pr_id == addr) 4215 break; 4216 if (pr == NULL) 4217 /* Assume address points to a valid prison. */ 4218 pr = (struct prison *)addr; 4219 } 4220 db_show_prison(pr); 4221 } 4222 4223 #endif /* DDB */
Cache object: 2a4eb2f7e7b6161546e33fc431a5c9b4
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