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 * Copyright (c) 1999 Poul-Henning Kamp. 3 * Copyright (c) 2008 Bjoern A. Zeeb. 4 * Copyright (c) 2009 James Gritton. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD: releng/9.1/sys/kern/kern_jail.c 236253 2012-05-29 19:47:06Z trasz $"); 31 32 #include "opt_compat.h" 33 #include "opt_ddb.h" 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/kernel.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/sysproto.h> 43 #include <sys/malloc.h> 44 #include <sys/osd.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/taskqueue.h> 48 #include <sys/fcntl.h> 49 #include <sys/jail.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/racct.h> 53 #include <sys/refcount.h> 54 #include <sys/sx.h> 55 #include <sys/sysent.h> 56 #include <sys/namei.h> 57 #include <sys/mount.h> 58 #include <sys/queue.h> 59 #include <sys/socket.h> 60 #include <sys/syscallsubr.h> 61 #include <sys/sysctl.h> 62 #include <sys/vnode.h> 63 64 #include <net/if.h> 65 #include <net/vnet.h> 66 67 #include <netinet/in.h> 68 69 #ifdef DDB 70 #include <ddb/ddb.h> 71 #ifdef INET6 72 #include <netinet6/in6_var.h> 73 #endif /* INET6 */ 74 #endif /* DDB */ 75 76 #include <security/mac/mac_framework.h> 77 78 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 79 80 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 81 MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 82 83 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 84 #ifdef INET 85 #ifdef INET6 86 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 87 #else 88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 89 #endif 90 #else /* !INET */ 91 #ifdef INET6 92 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 93 #else 94 #define _PR_IP_SADDRSEL 0 95 #endif 96 #endif 97 98 /* prison0 describes what is "real" about the system. */ 99 struct prison prison0 = { 100 .pr_id = 0, 101 .pr_name = "", 102 .pr_ref = 1, 103 .pr_uref = 1, 104 .pr_path = "/", 105 .pr_securelevel = -1, 106 .pr_devfs_rsnum = 0, 107 .pr_childmax = JAIL_MAX, 108 .pr_hostuuid = DEFAULT_HOSTUUID, 109 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 110 #ifdef VIMAGE 111 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 112 #else 113 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 114 #endif 115 .pr_allow = PR_ALLOW_ALL, 116 }; 117 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 118 119 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 120 struct sx allprison_lock; 121 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 122 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 123 LIST_HEAD(, prison_racct) allprison_racct; 124 int lastprid = 0; 125 126 static int do_jail_attach(struct thread *td, struct prison *pr); 127 static void prison_complete(void *context, int pending); 128 static void prison_deref(struct prison *pr, int flags); 129 static char *prison_path(struct prison *pr1, struct prison *pr2); 130 static void prison_remove_one(struct prison *pr); 131 #ifdef RACCT 132 static void prison_racct_attach(struct prison *pr); 133 static void prison_racct_modify(struct prison *pr); 134 static void prison_racct_detach(struct prison *pr); 135 #endif 136 #ifdef INET 137 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia); 138 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4); 139 #endif 140 #ifdef INET6 141 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6); 142 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6); 143 #endif 144 145 /* Flags for prison_deref */ 146 #define PD_DEREF 0x01 147 #define PD_DEUREF 0x02 148 #define PD_LOCKED 0x04 149 #define PD_LIST_SLOCKED 0x08 150 #define PD_LIST_XLOCKED 0x10 151 152 /* 153 * Parameter names corresponding to PR_* flag values. Size values are for kvm 154 * as we cannot figure out the size of a sparse array, or an array without a 155 * terminating entry. 156 */ 157 static char *pr_flag_names[] = { 158 [0] = "persist", 159 #ifdef INET 160 [7] = "ip4.saddrsel", 161 #endif 162 #ifdef INET6 163 [8] = "ip6.saddrsel", 164 #endif 165 }; 166 const size_t pr_flag_names_size = sizeof(pr_flag_names); 167 168 static char *pr_flag_nonames[] = { 169 [0] = "nopersist", 170 #ifdef INET 171 [7] = "ip4.nosaddrsel", 172 #endif 173 #ifdef INET6 174 [8] = "ip6.nosaddrsel", 175 #endif 176 }; 177 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames); 178 179 struct jailsys_flags { 180 const char *name; 181 unsigned disable; 182 unsigned new; 183 } pr_flag_jailsys[] = { 184 { "host", 0, PR_HOST }, 185 #ifdef VIMAGE 186 { "vnet", 0, PR_VNET }, 187 #endif 188 #ifdef INET 189 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER }, 190 #endif 191 #ifdef INET6 192 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER }, 193 #endif 194 }; 195 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 196 197 static char *pr_allow_names[] = { 198 "allow.set_hostname", 199 "allow.sysvipc", 200 "allow.raw_sockets", 201 "allow.chflags", 202 "allow.mount", 203 "allow.quotas", 204 "allow.socket_af", 205 "allow.mount.devfs", 206 "allow.mount.nullfs", 207 "allow.mount.zfs", 208 "allow.mount.procfs", 209 }; 210 const size_t pr_allow_names_size = sizeof(pr_allow_names); 211 212 static char *pr_allow_nonames[] = { 213 "allow.noset_hostname", 214 "allow.nosysvipc", 215 "allow.noraw_sockets", 216 "allow.nochflags", 217 "allow.nomount", 218 "allow.noquotas", 219 "allow.nosocket_af", 220 "allow.mount.nodevfs", 221 "allow.mount.nonullfs", 222 "allow.mount.nozfs", 223 "allow.mount.noprocfs", 224 }; 225 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames); 226 227 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 228 #define JAIL_DEFAULT_ENFORCE_STATFS 2 229 #define JAIL_DEFAULT_DEVFS_RSNUM 0 230 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 231 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 232 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 233 #if defined(INET) || defined(INET6) 234 static unsigned jail_max_af_ips = 255; 235 #endif 236 237 #ifdef INET 238 static int 239 qcmp_v4(const void *ip1, const void *ip2) 240 { 241 in_addr_t iaa, iab; 242 243 /* 244 * We need to compare in HBO here to get the list sorted as expected 245 * by the result of the code. Sorting NBO addresses gives you 246 * interesting results. If you do not understand, do not try. 247 */ 248 iaa = ntohl(((const struct in_addr *)ip1)->s_addr); 249 iab = ntohl(((const struct in_addr *)ip2)->s_addr); 250 251 /* 252 * Do not simply return the difference of the two numbers, the int is 253 * not wide enough. 254 */ 255 if (iaa > iab) 256 return (1); 257 else if (iaa < iab) 258 return (-1); 259 else 260 return (0); 261 } 262 #endif 263 264 #ifdef INET6 265 static int 266 qcmp_v6(const void *ip1, const void *ip2) 267 { 268 const struct in6_addr *ia6a, *ia6b; 269 int i, rc; 270 271 ia6a = (const struct in6_addr *)ip1; 272 ia6b = (const struct in6_addr *)ip2; 273 274 rc = 0; 275 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 276 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 277 rc = 1; 278 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 279 rc = -1; 280 } 281 return (rc); 282 } 283 #endif 284 285 /* 286 * struct jail_args { 287 * struct jail *jail; 288 * }; 289 */ 290 int 291 sys_jail(struct thread *td, struct jail_args *uap) 292 { 293 uint32_t version; 294 int error; 295 struct jail j; 296 297 error = copyin(uap->jail, &version, sizeof(uint32_t)); 298 if (error) 299 return (error); 300 301 switch (version) { 302 case 0: 303 { 304 struct jail_v0 j0; 305 306 /* FreeBSD single IPv4 jails. */ 307 bzero(&j, sizeof(struct jail)); 308 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 309 if (error) 310 return (error); 311 j.version = j0.version; 312 j.path = j0.path; 313 j.hostname = j0.hostname; 314 j.ip4s = j0.ip_number; 315 break; 316 } 317 318 case 1: 319 /* 320 * Version 1 was used by multi-IPv4 jail implementations 321 * that never made it into the official kernel. 322 */ 323 return (EINVAL); 324 325 case 2: /* JAIL_API_VERSION */ 326 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 327 error = copyin(uap->jail, &j, sizeof(struct jail)); 328 if (error) 329 return (error); 330 break; 331 332 default: 333 /* Sci-Fi jails are not supported, sorry. */ 334 return (EINVAL); 335 } 336 return (kern_jail(td, &j)); 337 } 338 339 int 340 kern_jail(struct thread *td, struct jail *j) 341 { 342 struct iovec optiov[2 * (4 343 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0]) 344 #ifdef INET 345 + 1 346 #endif 347 #ifdef INET6 348 + 1 349 #endif 350 )]; 351 struct uio opt; 352 char *u_path, *u_hostname, *u_name; 353 #ifdef INET 354 uint32_t ip4s; 355 struct in_addr *u_ip4; 356 #endif 357 #ifdef INET6 358 struct in6_addr *u_ip6; 359 #endif 360 size_t tmplen; 361 int error, enforce_statfs, fi; 362 363 bzero(&optiov, sizeof(optiov)); 364 opt.uio_iov = optiov; 365 opt.uio_iovcnt = 0; 366 opt.uio_offset = -1; 367 opt.uio_resid = -1; 368 opt.uio_segflg = UIO_SYSSPACE; 369 opt.uio_rw = UIO_READ; 370 opt.uio_td = td; 371 372 /* Set permissions for top-level jails from sysctls. */ 373 if (!jailed(td->td_ucred)) { 374 for (fi = 0; fi < sizeof(pr_allow_names) / 375 sizeof(pr_allow_names[0]); fi++) { 376 optiov[opt.uio_iovcnt].iov_base = 377 (jail_default_allow & (1 << fi)) 378 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 379 optiov[opt.uio_iovcnt].iov_len = 380 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 381 opt.uio_iovcnt += 2; 382 } 383 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 384 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 385 opt.uio_iovcnt++; 386 enforce_statfs = jail_default_enforce_statfs; 387 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 388 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 389 opt.uio_iovcnt++; 390 } 391 392 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 393 #ifdef INET 394 ip4s = (j->version == 0) ? 1 : j->ip4s; 395 if (ip4s > jail_max_af_ips) 396 return (EINVAL); 397 tmplen += ip4s * sizeof(struct in_addr); 398 #else 399 if (j->ip4s > 0) 400 return (EINVAL); 401 #endif 402 #ifdef INET6 403 if (j->ip6s > jail_max_af_ips) 404 return (EINVAL); 405 tmplen += j->ip6s * sizeof(struct in6_addr); 406 #else 407 if (j->ip6s > 0) 408 return (EINVAL); 409 #endif 410 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 411 u_hostname = u_path + MAXPATHLEN; 412 u_name = u_hostname + MAXHOSTNAMELEN; 413 #ifdef INET 414 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 415 #endif 416 #ifdef INET6 417 #ifdef INET 418 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 419 #else 420 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 421 #endif 422 #endif 423 optiov[opt.uio_iovcnt].iov_base = "path"; 424 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 425 opt.uio_iovcnt++; 426 optiov[opt.uio_iovcnt].iov_base = u_path; 427 error = copyinstr(j->path, u_path, MAXPATHLEN, 428 &optiov[opt.uio_iovcnt].iov_len); 429 if (error) { 430 free(u_path, M_TEMP); 431 return (error); 432 } 433 opt.uio_iovcnt++; 434 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 435 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 436 opt.uio_iovcnt++; 437 optiov[opt.uio_iovcnt].iov_base = u_hostname; 438 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 439 &optiov[opt.uio_iovcnt].iov_len); 440 if (error) { 441 free(u_path, M_TEMP); 442 return (error); 443 } 444 opt.uio_iovcnt++; 445 if (j->jailname != NULL) { 446 optiov[opt.uio_iovcnt].iov_base = "name"; 447 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 448 opt.uio_iovcnt++; 449 optiov[opt.uio_iovcnt].iov_base = u_name; 450 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 451 &optiov[opt.uio_iovcnt].iov_len); 452 if (error) { 453 free(u_path, M_TEMP); 454 return (error); 455 } 456 opt.uio_iovcnt++; 457 } 458 #ifdef INET 459 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 460 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 461 opt.uio_iovcnt++; 462 optiov[opt.uio_iovcnt].iov_base = u_ip4; 463 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 464 if (j->version == 0) 465 u_ip4->s_addr = j->ip4s; 466 else { 467 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 468 if (error) { 469 free(u_path, M_TEMP); 470 return (error); 471 } 472 } 473 opt.uio_iovcnt++; 474 #endif 475 #ifdef INET6 476 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 477 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 478 opt.uio_iovcnt++; 479 optiov[opt.uio_iovcnt].iov_base = u_ip6; 480 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 481 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 482 if (error) { 483 free(u_path, M_TEMP); 484 return (error); 485 } 486 opt.uio_iovcnt++; 487 #endif 488 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]), 489 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 490 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 491 free(u_path, M_TEMP); 492 return (error); 493 } 494 495 496 /* 497 * struct jail_set_args { 498 * struct iovec *iovp; 499 * unsigned int iovcnt; 500 * int flags; 501 * }; 502 */ 503 int 504 sys_jail_set(struct thread *td, struct jail_set_args *uap) 505 { 506 struct uio *auio; 507 int error; 508 509 /* Check that we have an even number of iovecs. */ 510 if (uap->iovcnt & 1) 511 return (EINVAL); 512 513 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 514 if (error) 515 return (error); 516 error = kern_jail_set(td, auio, uap->flags); 517 free(auio, M_IOV); 518 return (error); 519 } 520 521 int 522 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 523 { 524 struct nameidata nd; 525 #ifdef INET 526 struct in_addr *ip4; 527 #endif 528 #ifdef INET6 529 struct in6_addr *ip6; 530 #endif 531 struct vfsopt *opt; 532 struct vfsoptlist *opts; 533 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 534 struct vnode *root; 535 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 536 char *g_path; 537 #if defined(INET) || defined(INET6) 538 struct prison *tppr; 539 void *op; 540 #endif 541 unsigned long hid; 542 size_t namelen, onamelen; 543 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos; 544 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 545 int fi, jid, jsys, len, level; 546 int childmax, rsnum, slevel, vfslocked; 547 int fullpath_disabled; 548 #if defined(INET) || defined(INET6) 549 int ii, ij; 550 #endif 551 #ifdef INET 552 int ip4s, redo_ip4; 553 #endif 554 #ifdef INET6 555 int ip6s, redo_ip6; 556 #endif 557 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 558 unsigned tallow; 559 char numbuf[12]; 560 561 error = priv_check(td, PRIV_JAIL_SET); 562 if (!error && (flags & JAIL_ATTACH)) 563 error = priv_check(td, PRIV_JAIL_ATTACH); 564 if (error) 565 return (error); 566 mypr = ppr = td->td_ucred->cr_prison; 567 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 568 return (EPERM); 569 if (flags & ~JAIL_SET_MASK) 570 return (EINVAL); 571 572 /* 573 * Check all the parameters before committing to anything. Not all 574 * errors can be caught early, but we may as well try. Also, this 575 * takes care of some expensive stuff (path lookup) before getting 576 * the allprison lock. 577 * 578 * XXX Jails are not filesystems, and jail parameters are not mount 579 * options. But it makes more sense to re-use the vfsopt code 580 * than duplicate it under a different name. 581 */ 582 error = vfs_buildopts(optuio, &opts); 583 if (error) 584 return (error); 585 #ifdef INET 586 ip4 = NULL; 587 #endif 588 #ifdef INET6 589 ip6 = NULL; 590 #endif 591 g_path = NULL; 592 593 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 594 if (error == ENOENT) 595 jid = 0; 596 else if (error != 0) 597 goto done_free; 598 599 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 600 if (error == ENOENT) 601 gotslevel = 0; 602 else if (error != 0) 603 goto done_free; 604 else 605 gotslevel = 1; 606 607 error = 608 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 609 if (error == ENOENT) 610 gotchildmax = 0; 611 else if (error != 0) 612 goto done_free; 613 else 614 gotchildmax = 1; 615 616 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 617 if (error == ENOENT) 618 gotenforce = 0; 619 else if (error != 0) 620 goto done_free; 621 else if (enforce < 0 || enforce > 2) { 622 error = EINVAL; 623 goto done_free; 624 } else 625 gotenforce = 1; 626 627 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 628 if (error == ENOENT) 629 gotrsnum = 0; 630 else if (error != 0) 631 goto done_free; 632 else 633 gotrsnum = 1; 634 635 pr_flags = ch_flags = 0; 636 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 637 fi++) { 638 if (pr_flag_names[fi] == NULL) 639 continue; 640 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 641 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 642 } 643 ch_flags |= pr_flags; 644 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 645 fi++) { 646 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 647 sizeof(jsys)); 648 if (error == ENOENT) 649 continue; 650 if (error != 0) 651 goto done_free; 652 switch (jsys) { 653 case JAIL_SYS_DISABLE: 654 if (!pr_flag_jailsys[fi].disable) { 655 error = EINVAL; 656 goto done_free; 657 } 658 pr_flags |= pr_flag_jailsys[fi].disable; 659 break; 660 case JAIL_SYS_NEW: 661 pr_flags |= pr_flag_jailsys[fi].new; 662 break; 663 case JAIL_SYS_INHERIT: 664 break; 665 default: 666 error = EINVAL; 667 goto done_free; 668 } 669 ch_flags |= 670 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 671 } 672 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 673 && !(pr_flags & PR_PERSIST)) { 674 error = EINVAL; 675 vfs_opterror(opts, "new jail must persist or attach"); 676 goto done_errmsg; 677 } 678 #ifdef VIMAGE 679 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 680 error = EINVAL; 681 vfs_opterror(opts, "vnet cannot be changed after creation"); 682 goto done_errmsg; 683 } 684 #endif 685 #ifdef INET 686 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 687 error = EINVAL; 688 vfs_opterror(opts, "ip4 cannot be changed after creation"); 689 goto done_errmsg; 690 } 691 #endif 692 #ifdef INET6 693 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 694 error = EINVAL; 695 vfs_opterror(opts, "ip6 cannot be changed after creation"); 696 goto done_errmsg; 697 } 698 #endif 699 700 pr_allow = ch_allow = 0; 701 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 702 fi++) { 703 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 704 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 705 } 706 ch_allow |= pr_allow; 707 708 error = vfs_getopt(opts, "name", (void **)&name, &len); 709 if (error == ENOENT) 710 name = NULL; 711 else if (error != 0) 712 goto done_free; 713 else { 714 if (len == 0 || name[len - 1] != '\0') { 715 error = EINVAL; 716 goto done_free; 717 } 718 if (len > MAXHOSTNAMELEN) { 719 error = ENAMETOOLONG; 720 goto done_free; 721 } 722 } 723 724 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 725 if (error == ENOENT) 726 host = NULL; 727 else if (error != 0) 728 goto done_free; 729 else { 730 ch_flags |= PR_HOST; 731 pr_flags |= PR_HOST; 732 if (len == 0 || host[len - 1] != '\0') { 733 error = EINVAL; 734 goto done_free; 735 } 736 if (len > MAXHOSTNAMELEN) { 737 error = ENAMETOOLONG; 738 goto done_free; 739 } 740 } 741 742 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 743 if (error == ENOENT) 744 domain = NULL; 745 else if (error != 0) 746 goto done_free; 747 else { 748 ch_flags |= PR_HOST; 749 pr_flags |= PR_HOST; 750 if (len == 0 || domain[len - 1] != '\0') { 751 error = EINVAL; 752 goto done_free; 753 } 754 if (len > MAXHOSTNAMELEN) { 755 error = ENAMETOOLONG; 756 goto done_free; 757 } 758 } 759 760 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 761 if (error == ENOENT) 762 uuid = NULL; 763 else if (error != 0) 764 goto done_free; 765 else { 766 ch_flags |= PR_HOST; 767 pr_flags |= PR_HOST; 768 if (len == 0 || uuid[len - 1] != '\0') { 769 error = EINVAL; 770 goto done_free; 771 } 772 if (len > HOSTUUIDLEN) { 773 error = ENAMETOOLONG; 774 goto done_free; 775 } 776 } 777 778 #ifdef COMPAT_FREEBSD32 779 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 780 uint32_t hid32; 781 782 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 783 hid = hid32; 784 } else 785 #endif 786 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 787 if (error == ENOENT) 788 gothid = 0; 789 else if (error != 0) 790 goto done_free; 791 else { 792 gothid = 1; 793 ch_flags |= PR_HOST; 794 pr_flags |= PR_HOST; 795 } 796 797 #ifdef INET 798 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 799 if (error == ENOENT) 800 ip4s = (pr_flags & PR_IP4_DISABLE) ? 0 : -1; 801 else if (error != 0) 802 goto done_free; 803 else if (ip4s & (sizeof(*ip4) - 1)) { 804 error = EINVAL; 805 goto done_free; 806 } else { 807 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE; 808 if (ip4s == 0) 809 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE; 810 else { 811 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER; 812 ip4s /= sizeof(*ip4); 813 if (ip4s > jail_max_af_ips) { 814 error = EINVAL; 815 vfs_opterror(opts, "too many IPv4 addresses"); 816 goto done_errmsg; 817 } 818 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 819 bcopy(op, ip4, ip4s * sizeof(*ip4)); 820 /* 821 * IP addresses are all sorted but ip[0] to preserve 822 * the primary IP address as given from userland. 823 * This special IP is used for unbound outgoing 824 * connections as well for "loopback" traffic in case 825 * source address selection cannot find any more fitting 826 * address to connect from. 827 */ 828 if (ip4s > 1) 829 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4); 830 /* 831 * Check for duplicate addresses and do some simple 832 * zero and broadcast checks. If users give other bogus 833 * addresses it is their problem. 834 * 835 * We do not have to care about byte order for these 836 * checks so we will do them in NBO. 837 */ 838 for (ii = 0; ii < ip4s; ii++) { 839 if (ip4[ii].s_addr == INADDR_ANY || 840 ip4[ii].s_addr == INADDR_BROADCAST) { 841 error = EINVAL; 842 goto done_free; 843 } 844 if ((ii+1) < ip4s && 845 (ip4[0].s_addr == ip4[ii+1].s_addr || 846 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 847 error = EINVAL; 848 goto done_free; 849 } 850 } 851 } 852 } 853 #endif 854 855 #ifdef INET6 856 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 857 if (error == ENOENT) 858 ip6s = (pr_flags & PR_IP6_DISABLE) ? 0 : -1; 859 else if (error != 0) 860 goto done_free; 861 else if (ip6s & (sizeof(*ip6) - 1)) { 862 error = EINVAL; 863 goto done_free; 864 } else { 865 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE; 866 if (ip6s == 0) 867 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE; 868 else { 869 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER; 870 ip6s /= sizeof(*ip6); 871 if (ip6s > jail_max_af_ips) { 872 error = EINVAL; 873 vfs_opterror(opts, "too many IPv6 addresses"); 874 goto done_errmsg; 875 } 876 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 877 bcopy(op, ip6, ip6s * sizeof(*ip6)); 878 if (ip6s > 1) 879 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6); 880 for (ii = 0; ii < ip6s; ii++) { 881 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 882 error = EINVAL; 883 goto done_free; 884 } 885 if ((ii+1) < ip6s && 886 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 887 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 888 { 889 error = EINVAL; 890 goto done_free; 891 } 892 } 893 } 894 } 895 #endif 896 897 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 898 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 899 error = EINVAL; 900 vfs_opterror(opts, 901 "vnet jails cannot have IP address restrictions"); 902 goto done_errmsg; 903 } 904 #endif 905 906 fullpath_disabled = 0; 907 root = NULL; 908 error = vfs_getopt(opts, "path", (void **)&path, &len); 909 if (error == ENOENT) 910 path = NULL; 911 else if (error != 0) 912 goto done_free; 913 else { 914 if (flags & JAIL_UPDATE) { 915 error = EINVAL; 916 vfs_opterror(opts, 917 "path cannot be changed after creation"); 918 goto done_errmsg; 919 } 920 if (len == 0 || path[len - 1] != '\0') { 921 error = EINVAL; 922 goto done_free; 923 } 924 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE, UIO_SYSSPACE, 925 path, td); 926 error = namei(&nd); 927 if (error) 928 goto done_free; 929 vfslocked = NDHASGIANT(&nd); 930 root = nd.ni_vp; 931 NDFREE(&nd, NDF_ONLY_PNBUF); 932 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 933 strlcpy(g_path, path, MAXPATHLEN); 934 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 935 if (error == 0) 936 path = g_path; 937 else if (error == ENODEV) { 938 /* proceed if sysctl debug.disablefullpath == 1 */ 939 fullpath_disabled = 1; 940 if (len < 2 || (len == 2 && path[0] == '/')) 941 path = NULL; 942 } else { 943 /* exit on other errors */ 944 VFS_UNLOCK_GIANT(vfslocked); 945 goto done_free; 946 } 947 if (root->v_type != VDIR) { 948 error = ENOTDIR; 949 vput(root); 950 VFS_UNLOCK_GIANT(vfslocked); 951 goto done_free; 952 } 953 VOP_UNLOCK(root, 0); 954 VFS_UNLOCK_GIANT(vfslocked); 955 if (fullpath_disabled) { 956 /* Leave room for a real-root full pathname. */ 957 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 958 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 959 error = ENAMETOOLONG; 960 goto done_free; 961 } 962 } 963 } 964 965 /* 966 * Grab the allprison lock before letting modules check their 967 * parameters. Once we have it, do not let go so we'll have a 968 * consistent view of the OSD list. 969 */ 970 sx_xlock(&allprison_lock); 971 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts); 972 if (error) 973 goto done_unlock_list; 974 975 /* By now, all parameters should have been noted. */ 976 TAILQ_FOREACH(opt, opts, link) { 977 if (!opt->seen && strcmp(opt->name, "errmsg")) { 978 error = EINVAL; 979 vfs_opterror(opts, "unknown parameter: %s", opt->name); 980 goto done_unlock_list; 981 } 982 } 983 984 /* 985 * See if we are creating a new record or updating an existing one. 986 * This abuses the file error codes ENOENT and EEXIST. 987 */ 988 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 989 if (!cuflags) { 990 error = EINVAL; 991 vfs_opterror(opts, "no valid operation (create or update)"); 992 goto done_unlock_list; 993 } 994 pr = NULL; 995 namelc = NULL; 996 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 997 namelc = strrchr(name, '.'); 998 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 999 if (*p != '\0') 1000 jid = 0; 1001 } 1002 if (jid != 0) { 1003 /* 1004 * See if a requested jid already exists. There is an 1005 * information leak here if the jid exists but is not within 1006 * the caller's jail hierarchy. Jail creators will get EEXIST 1007 * even though they cannot see the jail, and CREATE | UPDATE 1008 * will return ENOENT which is not normally a valid error. 1009 */ 1010 if (jid < 0) { 1011 error = EINVAL; 1012 vfs_opterror(opts, "negative jid"); 1013 goto done_unlock_list; 1014 } 1015 pr = prison_find(jid); 1016 if (pr != NULL) { 1017 ppr = pr->pr_parent; 1018 /* Create: jid must not exist. */ 1019 if (cuflags == JAIL_CREATE) { 1020 mtx_unlock(&pr->pr_mtx); 1021 error = EEXIST; 1022 vfs_opterror(opts, "jail %d already exists", 1023 jid); 1024 goto done_unlock_list; 1025 } 1026 if (!prison_ischild(mypr, pr)) { 1027 mtx_unlock(&pr->pr_mtx); 1028 pr = NULL; 1029 } else if (pr->pr_uref == 0) { 1030 if (!(flags & JAIL_DYING)) { 1031 mtx_unlock(&pr->pr_mtx); 1032 error = ENOENT; 1033 vfs_opterror(opts, "jail %d is dying", 1034 jid); 1035 goto done_unlock_list; 1036 } else if ((flags & JAIL_ATTACH) || 1037 (pr_flags & PR_PERSIST)) { 1038 /* 1039 * A dying jail might be resurrected 1040 * (via attach or persist), but first 1041 * it must determine if another jail 1042 * has claimed its name. Accomplish 1043 * this by implicitly re-setting the 1044 * name. 1045 */ 1046 if (name == NULL) 1047 name = prison_name(mypr, pr); 1048 } 1049 } 1050 } 1051 if (pr == NULL) { 1052 /* Update: jid must exist. */ 1053 if (cuflags == JAIL_UPDATE) { 1054 error = ENOENT; 1055 vfs_opterror(opts, "jail %d not found", jid); 1056 goto done_unlock_list; 1057 } 1058 } 1059 } 1060 /* 1061 * If the caller provided a name, look for a jail by that name. 1062 * This has different semantics for creates and updates keyed by jid 1063 * (where the name must not already exist in a different jail), 1064 * and updates keyed by the name itself (where the name must exist 1065 * because that is the jail being updated). 1066 */ 1067 if (name != NULL) { 1068 namelc = strrchr(name, '.'); 1069 if (namelc == NULL) 1070 namelc = name; 1071 else { 1072 /* 1073 * This is a hierarchical name. Split it into the 1074 * parent and child names, and make sure the parent 1075 * exists or matches an already found jail. 1076 */ 1077 *namelc = '\0'; 1078 if (pr != NULL) { 1079 if (strncmp(name, ppr->pr_name, namelc - name) 1080 || ppr->pr_name[namelc - name] != '\0') { 1081 mtx_unlock(&pr->pr_mtx); 1082 error = EINVAL; 1083 vfs_opterror(opts, 1084 "cannot change jail's parent"); 1085 goto done_unlock_list; 1086 } 1087 } else { 1088 ppr = prison_find_name(mypr, name); 1089 if (ppr == NULL) { 1090 error = ENOENT; 1091 vfs_opterror(opts, 1092 "jail \"%s\" not found", name); 1093 goto done_unlock_list; 1094 } 1095 mtx_unlock(&ppr->pr_mtx); 1096 } 1097 name = ++namelc; 1098 } 1099 if (name[0] != '\0') { 1100 namelen = 1101 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1102 name_again: 1103 deadpr = NULL; 1104 FOREACH_PRISON_CHILD(ppr, tpr) { 1105 if (tpr != pr && tpr->pr_ref > 0 && 1106 !strcmp(tpr->pr_name + namelen, name)) { 1107 if (pr == NULL && 1108 cuflags != JAIL_CREATE) { 1109 mtx_lock(&tpr->pr_mtx); 1110 if (tpr->pr_ref > 0) { 1111 /* 1112 * Use this jail 1113 * for updates. 1114 */ 1115 if (tpr->pr_uref > 0) { 1116 pr = tpr; 1117 break; 1118 } 1119 deadpr = tpr; 1120 } 1121 mtx_unlock(&tpr->pr_mtx); 1122 } else if (tpr->pr_uref > 0) { 1123 /* 1124 * Create, or update(jid): 1125 * name must not exist in an 1126 * active sibling jail. 1127 */ 1128 error = EEXIST; 1129 if (pr != NULL) 1130 mtx_unlock(&pr->pr_mtx); 1131 vfs_opterror(opts, 1132 "jail \"%s\" already exists", 1133 name); 1134 goto done_unlock_list; 1135 } 1136 } 1137 } 1138 /* If no active jail is found, use a dying one. */ 1139 if (deadpr != NULL && pr == NULL) { 1140 if (flags & JAIL_DYING) { 1141 mtx_lock(&deadpr->pr_mtx); 1142 if (deadpr->pr_ref == 0) { 1143 mtx_unlock(&deadpr->pr_mtx); 1144 goto name_again; 1145 } 1146 pr = deadpr; 1147 } else if (cuflags == JAIL_UPDATE) { 1148 error = ENOENT; 1149 vfs_opterror(opts, 1150 "jail \"%s\" is dying", name); 1151 goto done_unlock_list; 1152 } 1153 } 1154 /* Update: name must exist if no jid. */ 1155 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1156 error = ENOENT; 1157 vfs_opterror(opts, "jail \"%s\" not found", 1158 name); 1159 goto done_unlock_list; 1160 } 1161 } 1162 } 1163 /* Update: must provide a jid or name. */ 1164 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1165 error = ENOENT; 1166 vfs_opterror(opts, "update specified no jail"); 1167 goto done_unlock_list; 1168 } 1169 1170 /* If there's no prison to update, create a new one and link it in. */ 1171 if (pr == NULL) { 1172 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1173 if (tpr->pr_childcount >= tpr->pr_childmax) { 1174 error = EPERM; 1175 vfs_opterror(opts, "prison limit exceeded"); 1176 goto done_unlock_list; 1177 } 1178 created = 1; 1179 mtx_lock(&ppr->pr_mtx); 1180 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) { 1181 mtx_unlock(&ppr->pr_mtx); 1182 error = ENOENT; 1183 vfs_opterror(opts, "parent jail went away!"); 1184 goto done_unlock_list; 1185 } 1186 ppr->pr_ref++; 1187 ppr->pr_uref++; 1188 mtx_unlock(&ppr->pr_mtx); 1189 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1190 if (jid == 0) { 1191 /* Find the next free jid. */ 1192 jid = lastprid + 1; 1193 findnext: 1194 if (jid == JAIL_MAX) 1195 jid = 1; 1196 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1197 if (tpr->pr_id < jid) 1198 continue; 1199 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1200 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1201 break; 1202 } 1203 if (jid == lastprid) { 1204 error = EAGAIN; 1205 vfs_opterror(opts, 1206 "no available jail IDs"); 1207 free(pr, M_PRISON); 1208 prison_deref(ppr, PD_DEREF | 1209 PD_DEUREF | PD_LIST_XLOCKED); 1210 goto done_releroot; 1211 } 1212 jid++; 1213 goto findnext; 1214 } 1215 lastprid = jid; 1216 } else { 1217 /* 1218 * The jail already has a jid (that did not yet exist), 1219 * so just find where to insert it. 1220 */ 1221 TAILQ_FOREACH(tpr, &allprison, pr_list) 1222 if (tpr->pr_id >= jid) { 1223 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1224 break; 1225 } 1226 } 1227 if (tpr == NULL) 1228 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1229 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1230 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1231 tpr->pr_childcount++; 1232 1233 pr->pr_parent = ppr; 1234 pr->pr_id = jid; 1235 1236 /* Set some default values, and inherit some from the parent. */ 1237 if (name == NULL) 1238 name = ""; 1239 if (path == NULL) { 1240 path = "/"; 1241 root = mypr->pr_root; 1242 vref(root); 1243 } 1244 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1245 pr->pr_flags |= PR_HOST; 1246 #if defined(INET) || defined(INET6) 1247 #ifdef VIMAGE 1248 if (!(pr_flags & PR_VNET)) 1249 #endif 1250 { 1251 #ifdef INET 1252 if (!(ch_flags & PR_IP4_USER)) 1253 pr->pr_flags |= 1254 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE; 1255 else if (!(pr_flags & PR_IP4_USER)) { 1256 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1257 if (ppr->pr_ip4 != NULL) { 1258 pr->pr_ip4s = ppr->pr_ip4s; 1259 pr->pr_ip4 = malloc(pr->pr_ip4s * 1260 sizeof(struct in_addr), M_PRISON, 1261 M_WAITOK); 1262 bcopy(ppr->pr_ip4, pr->pr_ip4, 1263 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1264 } 1265 } 1266 #endif 1267 #ifdef INET6 1268 if (!(ch_flags & PR_IP6_USER)) 1269 pr->pr_flags |= 1270 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE; 1271 else if (!(pr_flags & PR_IP6_USER)) { 1272 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1273 if (ppr->pr_ip6 != NULL) { 1274 pr->pr_ip6s = ppr->pr_ip6s; 1275 pr->pr_ip6 = malloc(pr->pr_ip6s * 1276 sizeof(struct in6_addr), M_PRISON, 1277 M_WAITOK); 1278 bcopy(ppr->pr_ip6, pr->pr_ip6, 1279 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1280 } 1281 } 1282 #endif 1283 } 1284 #endif 1285 /* Source address selection is always on by default. */ 1286 pr->pr_flags |= _PR_IP_SADDRSEL; 1287 1288 pr->pr_securelevel = ppr->pr_securelevel; 1289 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1290 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 1291 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1292 1293 LIST_INIT(&pr->pr_children); 1294 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1295 1296 #ifdef VIMAGE 1297 /* Allocate a new vnet if specified. */ 1298 pr->pr_vnet = (pr_flags & PR_VNET) 1299 ? vnet_alloc() : ppr->pr_vnet; 1300 #endif 1301 /* 1302 * Allocate a dedicated cpuset for each jail. 1303 * Unlike other initial settings, this may return an erorr. 1304 */ 1305 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1306 if (error) { 1307 prison_deref(pr, PD_LIST_XLOCKED); 1308 goto done_releroot; 1309 } 1310 1311 mtx_lock(&pr->pr_mtx); 1312 /* 1313 * New prisons do not yet have a reference, because we do not 1314 * want other to see the incomplete prison once the 1315 * allprison_lock is downgraded. 1316 */ 1317 } else { 1318 created = 0; 1319 /* 1320 * Grab a reference for existing prisons, to ensure they 1321 * continue to exist for the duration of the call. 1322 */ 1323 pr->pr_ref++; 1324 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1325 if ((pr->pr_flags & PR_VNET) && 1326 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1327 error = EINVAL; 1328 vfs_opterror(opts, 1329 "vnet jails cannot have IP address restrictions"); 1330 goto done_deref_locked; 1331 } 1332 #endif 1333 #ifdef INET 1334 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1335 error = EINVAL; 1336 vfs_opterror(opts, 1337 "ip4 cannot be changed after creation"); 1338 goto done_deref_locked; 1339 } 1340 #endif 1341 #ifdef INET6 1342 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1343 error = EINVAL; 1344 vfs_opterror(opts, 1345 "ip6 cannot be changed after creation"); 1346 goto done_deref_locked; 1347 } 1348 #endif 1349 } 1350 1351 /* Do final error checking before setting anything. */ 1352 if (gotslevel) { 1353 if (slevel < ppr->pr_securelevel) { 1354 error = EPERM; 1355 goto done_deref_locked; 1356 } 1357 } 1358 if (gotchildmax) { 1359 if (childmax >= ppr->pr_childmax) { 1360 error = EPERM; 1361 goto done_deref_locked; 1362 } 1363 } 1364 if (gotenforce) { 1365 if (enforce < ppr->pr_enforce_statfs) { 1366 error = EPERM; 1367 goto done_deref_locked; 1368 } 1369 } 1370 if (gotrsnum) { 1371 /* 1372 * devfs_rsnum is a uint16_t 1373 */ 1374 if (rsnum < 0 || rsnum > 65535) { 1375 error = EINVAL; 1376 goto done_deref_locked; 1377 } 1378 /* 1379 * Nested jails always inherit parent's devfs ruleset 1380 */ 1381 if (jailed(td->td_ucred)) { 1382 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1383 error = EPERM; 1384 goto done_deref_locked; 1385 } else 1386 rsnum = ppr->pr_devfs_rsnum; 1387 } 1388 } 1389 #ifdef INET 1390 if (ip4s > 0) { 1391 if (ppr->pr_flags & PR_IP4) { 1392 /* 1393 * Make sure the new set of IP addresses is a 1394 * subset of the parent's list. Don't worry 1395 * about the parent being unlocked, as any 1396 * setting is done with allprison_lock held. 1397 */ 1398 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1399 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1400 break; 1401 if (ij == ppr->pr_ip4s) { 1402 error = EPERM; 1403 goto done_deref_locked; 1404 } 1405 if (ip4s > 1) { 1406 for (ii = ij = 1; ii < ip4s; ii++) { 1407 if (ip4[ii].s_addr == 1408 ppr->pr_ip4[0].s_addr) 1409 continue; 1410 for (; ij < ppr->pr_ip4s; ij++) 1411 if (ip4[ii].s_addr == 1412 ppr->pr_ip4[ij].s_addr) 1413 break; 1414 if (ij == ppr->pr_ip4s) 1415 break; 1416 } 1417 if (ij == ppr->pr_ip4s) { 1418 error = EPERM; 1419 goto done_deref_locked; 1420 } 1421 } 1422 } 1423 /* 1424 * Check for conflicting IP addresses. We permit them 1425 * if there is no more than one IP on each jail. If 1426 * there is a duplicate on a jail with more than one 1427 * IP stop checking and return error. 1428 */ 1429 tppr = ppr; 1430 #ifdef VIMAGE 1431 for (; tppr != &prison0; tppr = tppr->pr_parent) 1432 if (tppr->pr_flags & PR_VNET) 1433 break; 1434 #endif 1435 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1436 if (tpr == pr || 1437 #ifdef VIMAGE 1438 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1439 #endif 1440 tpr->pr_uref == 0) { 1441 descend = 0; 1442 continue; 1443 } 1444 if (!(tpr->pr_flags & PR_IP4_USER)) 1445 continue; 1446 descend = 0; 1447 if (tpr->pr_ip4 == NULL || 1448 (ip4s == 1 && tpr->pr_ip4s == 1)) 1449 continue; 1450 for (ii = 0; ii < ip4s; ii++) { 1451 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1452 error = EADDRINUSE; 1453 vfs_opterror(opts, 1454 "IPv4 addresses clash"); 1455 goto done_deref_locked; 1456 } 1457 } 1458 } 1459 } 1460 #endif 1461 #ifdef INET6 1462 if (ip6s > 0) { 1463 if (ppr->pr_flags & PR_IP6) { 1464 /* 1465 * Make sure the new set of IP addresses is a 1466 * subset of the parent's list. 1467 */ 1468 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1469 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1470 &ppr->pr_ip6[ij])) 1471 break; 1472 if (ij == ppr->pr_ip6s) { 1473 error = EPERM; 1474 goto done_deref_locked; 1475 } 1476 if (ip6s > 1) { 1477 for (ii = ij = 1; ii < ip6s; ii++) { 1478 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1479 &ppr->pr_ip6[0])) 1480 continue; 1481 for (; ij < ppr->pr_ip6s; ij++) 1482 if (IN6_ARE_ADDR_EQUAL( 1483 &ip6[ii], &ppr->pr_ip6[ij])) 1484 break; 1485 if (ij == ppr->pr_ip6s) 1486 break; 1487 } 1488 if (ij == ppr->pr_ip6s) { 1489 error = EPERM; 1490 goto done_deref_locked; 1491 } 1492 } 1493 } 1494 /* Check for conflicting IP addresses. */ 1495 tppr = ppr; 1496 #ifdef VIMAGE 1497 for (; tppr != &prison0; tppr = tppr->pr_parent) 1498 if (tppr->pr_flags & PR_VNET) 1499 break; 1500 #endif 1501 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1502 if (tpr == pr || 1503 #ifdef VIMAGE 1504 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1505 #endif 1506 tpr->pr_uref == 0) { 1507 descend = 0; 1508 continue; 1509 } 1510 if (!(tpr->pr_flags & PR_IP6_USER)) 1511 continue; 1512 descend = 0; 1513 if (tpr->pr_ip6 == NULL || 1514 (ip6s == 1 && tpr->pr_ip6s == 1)) 1515 continue; 1516 for (ii = 0; ii < ip6s; ii++) { 1517 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1518 error = EADDRINUSE; 1519 vfs_opterror(opts, 1520 "IPv6 addresses clash"); 1521 goto done_deref_locked; 1522 } 1523 } 1524 } 1525 } 1526 #endif 1527 onamelen = namelen = 0; 1528 if (name != NULL) { 1529 /* Give a default name of the jid. */ 1530 if (name[0] == '\0') 1531 snprintf(name = numbuf, sizeof(numbuf), "%d", jid); 1532 else if (*namelc == '' || (strtoul(namelc, &p, 10) != jid && 1533 *p == '\0')) { 1534 error = EINVAL; 1535 vfs_opterror(opts, 1536 "name cannot be numeric (unless it is the jid)"); 1537 goto done_deref_locked; 1538 } 1539 /* 1540 * Make sure the name isn't too long for the prison or its 1541 * children. 1542 */ 1543 onamelen = strlen(pr->pr_name); 1544 namelen = strlen(name); 1545 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) { 1546 error = ENAMETOOLONG; 1547 goto done_deref_locked; 1548 } 1549 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1550 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1551 sizeof(pr->pr_name)) { 1552 error = ENAMETOOLONG; 1553 goto done_deref_locked; 1554 } 1555 } 1556 } 1557 if (pr_allow & ~ppr->pr_allow) { 1558 error = EPERM; 1559 goto done_deref_locked; 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 (name != NULL) { 1636 if (ppr == &prison0) 1637 strlcpy(pr->pr_name, name, sizeof(pr->pr_name)); 1638 else 1639 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1640 ppr->pr_name, name); 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 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1719 if (pr_flags & PR_PERSIST) { 1720 pr->pr_ref++; 1721 pr->pr_uref++; 1722 } else { 1723 pr->pr_ref--; 1724 pr->pr_uref--; 1725 } 1726 } 1727 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1728 mtx_unlock(&pr->pr_mtx); 1729 1730 #ifdef RACCT 1731 if (created) 1732 prison_racct_attach(pr); 1733 #endif 1734 1735 /* Locks may have prevented a complete restriction of child IP 1736 * addresses. If so, allocate some more memory and try again. 1737 */ 1738 #ifdef INET 1739 while (redo_ip4) { 1740 ip4s = pr->pr_ip4s; 1741 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1742 mtx_lock(&pr->pr_mtx); 1743 redo_ip4 = 0; 1744 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1745 #ifdef VIMAGE 1746 if (tpr->pr_flags & PR_VNET) { 1747 descend = 0; 1748 continue; 1749 } 1750 #endif 1751 if (prison_restrict_ip4(tpr, ip4)) { 1752 if (ip4 != NULL) 1753 ip4 = NULL; 1754 else 1755 redo_ip4 = 1; 1756 } 1757 } 1758 mtx_unlock(&pr->pr_mtx); 1759 } 1760 #endif 1761 #ifdef INET6 1762 while (redo_ip6) { 1763 ip6s = pr->pr_ip6s; 1764 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1765 mtx_lock(&pr->pr_mtx); 1766 redo_ip6 = 0; 1767 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1768 #ifdef VIMAGE 1769 if (tpr->pr_flags & PR_VNET) { 1770 descend = 0; 1771 continue; 1772 } 1773 #endif 1774 if (prison_restrict_ip6(tpr, ip6)) { 1775 if (ip6 != NULL) 1776 ip6 = NULL; 1777 else 1778 redo_ip6 = 1; 1779 } 1780 } 1781 mtx_unlock(&pr->pr_mtx); 1782 } 1783 #endif 1784 1785 /* Let the modules do their work. */ 1786 sx_downgrade(&allprison_lock); 1787 if (created) { 1788 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1789 if (error) { 1790 prison_deref(pr, PD_LIST_SLOCKED); 1791 goto done_errmsg; 1792 } 1793 } 1794 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1795 if (error) { 1796 prison_deref(pr, created 1797 ? PD_LIST_SLOCKED 1798 : PD_DEREF | PD_LIST_SLOCKED); 1799 goto done_errmsg; 1800 } 1801 1802 /* Attach this process to the prison if requested. */ 1803 if (flags & JAIL_ATTACH) { 1804 mtx_lock(&pr->pr_mtx); 1805 error = do_jail_attach(td, pr); 1806 if (error) { 1807 vfs_opterror(opts, "attach failed"); 1808 if (!created) 1809 prison_deref(pr, PD_DEREF); 1810 goto done_errmsg; 1811 } 1812 } 1813 1814 #ifdef RACCT 1815 if (!created) { 1816 sx_sunlock(&allprison_lock); 1817 prison_racct_modify(pr); 1818 sx_slock(&allprison_lock); 1819 } 1820 #endif 1821 1822 td->td_retval[0] = pr->pr_id; 1823 1824 /* 1825 * Now that it is all there, drop the temporary reference from existing 1826 * prisons. Or add a reference to newly created persistent prisons 1827 * (which was not done earlier so that the prison would not be publicly 1828 * visible). 1829 */ 1830 if (!created) { 1831 prison_deref(pr, (flags & JAIL_ATTACH) 1832 ? PD_DEREF 1833 : PD_DEREF | PD_LIST_SLOCKED); 1834 } else { 1835 if (pr_flags & PR_PERSIST) { 1836 mtx_lock(&pr->pr_mtx); 1837 pr->pr_ref++; 1838 pr->pr_uref++; 1839 mtx_unlock(&pr->pr_mtx); 1840 } 1841 if (!(flags & JAIL_ATTACH)) 1842 sx_sunlock(&allprison_lock); 1843 } 1844 1845 goto done_errmsg; 1846 1847 done_deref_locked: 1848 prison_deref(pr, created 1849 ? PD_LOCKED | PD_LIST_XLOCKED 1850 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1851 goto done_releroot; 1852 done_unlock_list: 1853 sx_xunlock(&allprison_lock); 1854 done_releroot: 1855 if (root != NULL) { 1856 vfslocked = VFS_LOCK_GIANT(root->v_mount); 1857 vrele(root); 1858 VFS_UNLOCK_GIANT(vfslocked); 1859 } 1860 done_errmsg: 1861 if (error) { 1862 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1863 if (errmsg_len > 0) { 1864 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1865 if (errmsg_pos > 0) { 1866 if (optuio->uio_segflg == UIO_SYSSPACE) 1867 bcopy(errmsg, 1868 optuio->uio_iov[errmsg_pos].iov_base, 1869 errmsg_len); 1870 else 1871 copyout(errmsg, 1872 optuio->uio_iov[errmsg_pos].iov_base, 1873 errmsg_len); 1874 } 1875 } 1876 } 1877 done_free: 1878 #ifdef INET 1879 free(ip4, M_PRISON); 1880 #endif 1881 #ifdef INET6 1882 free(ip6, M_PRISON); 1883 #endif 1884 if (g_path != NULL) 1885 free(g_path, M_TEMP); 1886 vfs_freeopts(opts); 1887 return (error); 1888 } 1889 1890 1891 /* 1892 * struct jail_get_args { 1893 * struct iovec *iovp; 1894 * unsigned int iovcnt; 1895 * int flags; 1896 * }; 1897 */ 1898 int 1899 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1900 { 1901 struct uio *auio; 1902 int error; 1903 1904 /* Check that we have an even number of iovecs. */ 1905 if (uap->iovcnt & 1) 1906 return (EINVAL); 1907 1908 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1909 if (error) 1910 return (error); 1911 error = kern_jail_get(td, auio, uap->flags); 1912 if (error == 0) 1913 error = copyout(auio->uio_iov, uap->iovp, 1914 uap->iovcnt * sizeof (struct iovec)); 1915 free(auio, M_IOV); 1916 return (error); 1917 } 1918 1919 int 1920 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1921 { 1922 struct prison *pr, *mypr; 1923 struct vfsopt *opt; 1924 struct vfsoptlist *opts; 1925 char *errmsg, *name; 1926 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1927 1928 if (flags & ~JAIL_GET_MASK) 1929 return (EINVAL); 1930 1931 /* Get the parameter list. */ 1932 error = vfs_buildopts(optuio, &opts); 1933 if (error) 1934 return (error); 1935 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1936 mypr = td->td_ucred->cr_prison; 1937 1938 /* 1939 * Find the prison specified by one of: lastjid, jid, name. 1940 */ 1941 sx_slock(&allprison_lock); 1942 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1943 if (error == 0) { 1944 TAILQ_FOREACH(pr, &allprison, pr_list) { 1945 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1946 mtx_lock(&pr->pr_mtx); 1947 if (pr->pr_ref > 0 && 1948 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1949 break; 1950 mtx_unlock(&pr->pr_mtx); 1951 } 1952 } 1953 if (pr != NULL) 1954 goto found_prison; 1955 error = ENOENT; 1956 vfs_opterror(opts, "no jail after %d", jid); 1957 goto done_unlock_list; 1958 } else if (error != ENOENT) 1959 goto done_unlock_list; 1960 1961 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1962 if (error == 0) { 1963 if (jid != 0) { 1964 pr = prison_find_child(mypr, jid); 1965 if (pr != NULL) { 1966 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1967 mtx_unlock(&pr->pr_mtx); 1968 error = ENOENT; 1969 vfs_opterror(opts, "jail %d is dying", 1970 jid); 1971 goto done_unlock_list; 1972 } 1973 goto found_prison; 1974 } 1975 error = ENOENT; 1976 vfs_opterror(opts, "jail %d not found", jid); 1977 goto done_unlock_list; 1978 } 1979 } else if (error != ENOENT) 1980 goto done_unlock_list; 1981 1982 error = vfs_getopt(opts, "name", (void **)&name, &len); 1983 if (error == 0) { 1984 if (len == 0 || name[len - 1] != '\0') { 1985 error = EINVAL; 1986 goto done_unlock_list; 1987 } 1988 pr = prison_find_name(mypr, name); 1989 if (pr != NULL) { 1990 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1991 mtx_unlock(&pr->pr_mtx); 1992 error = ENOENT; 1993 vfs_opterror(opts, "jail \"%s\" is dying", 1994 name); 1995 goto done_unlock_list; 1996 } 1997 goto found_prison; 1998 } 1999 error = ENOENT; 2000 vfs_opterror(opts, "jail \"%s\" not found", name); 2001 goto done_unlock_list; 2002 } else if (error != ENOENT) 2003 goto done_unlock_list; 2004 2005 vfs_opterror(opts, "no jail specified"); 2006 error = ENOENT; 2007 goto done_unlock_list; 2008 2009 found_prison: 2010 /* Get the parameters of the prison. */ 2011 pr->pr_ref++; 2012 locked = PD_LOCKED; 2013 td->td_retval[0] = pr->pr_id; 2014 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2015 if (error != 0 && error != ENOENT) 2016 goto done_deref; 2017 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2018 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2019 if (error != 0 && error != ENOENT) 2020 goto done_deref; 2021 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2022 if (error != 0 && error != ENOENT) 2023 goto done_deref; 2024 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2025 sizeof(pr->pr_cpuset->cs_id)); 2026 if (error != 0 && error != ENOENT) 2027 goto done_deref; 2028 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2029 if (error != 0 && error != ENOENT) 2030 goto done_deref; 2031 #ifdef INET 2032 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2033 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2034 if (error != 0 && error != ENOENT) 2035 goto done_deref; 2036 #endif 2037 #ifdef INET6 2038 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2039 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2040 if (error != 0 && error != ENOENT) 2041 goto done_deref; 2042 #endif 2043 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2044 sizeof(pr->pr_securelevel)); 2045 if (error != 0 && error != ENOENT) 2046 goto done_deref; 2047 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2048 sizeof(pr->pr_childcount)); 2049 if (error != 0 && error != ENOENT) 2050 goto done_deref; 2051 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2052 sizeof(pr->pr_childmax)); 2053 if (error != 0 && error != ENOENT) 2054 goto done_deref; 2055 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2056 if (error != 0 && error != ENOENT) 2057 goto done_deref; 2058 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2059 if (error != 0 && error != ENOENT) 2060 goto done_deref; 2061 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2062 if (error != 0 && error != ENOENT) 2063 goto done_deref; 2064 #ifdef COMPAT_FREEBSD32 2065 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2066 uint32_t hid32 = pr->pr_hostid; 2067 2068 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2069 } else 2070 #endif 2071 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2072 sizeof(pr->pr_hostid)); 2073 if (error != 0 && error != ENOENT) 2074 goto done_deref; 2075 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2076 sizeof(pr->pr_enforce_statfs)); 2077 if (error != 0 && error != ENOENT) 2078 goto done_deref; 2079 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2080 sizeof(pr->pr_devfs_rsnum)); 2081 if (error != 0 && error != ENOENT) 2082 goto done_deref; 2083 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 2084 fi++) { 2085 if (pr_flag_names[fi] == NULL) 2086 continue; 2087 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2088 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2089 if (error != 0 && error != ENOENT) 2090 goto done_deref; 2091 i = !i; 2092 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2093 if (error != 0 && error != ENOENT) 2094 goto done_deref; 2095 } 2096 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 2097 fi++) { 2098 i = pr->pr_flags & 2099 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2100 i = pr_flag_jailsys[fi].disable && 2101 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2102 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2103 : JAIL_SYS_INHERIT; 2104 error = 2105 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2106 if (error != 0 && error != ENOENT) 2107 goto done_deref; 2108 } 2109 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 2110 fi++) { 2111 if (pr_allow_names[fi] == NULL) 2112 continue; 2113 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2114 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2115 if (error != 0 && error != ENOENT) 2116 goto done_deref; 2117 i = !i; 2118 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2119 if (error != 0 && error != ENOENT) 2120 goto done_deref; 2121 } 2122 i = (pr->pr_uref == 0); 2123 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2124 if (error != 0 && error != ENOENT) 2125 goto done_deref; 2126 i = !i; 2127 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2128 if (error != 0 && error != ENOENT) 2129 goto done_deref; 2130 2131 /* Get the module parameters. */ 2132 mtx_unlock(&pr->pr_mtx); 2133 locked = 0; 2134 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2135 if (error) 2136 goto done_deref; 2137 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2138 2139 /* By now, all parameters should have been noted. */ 2140 TAILQ_FOREACH(opt, opts, link) { 2141 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2142 error = EINVAL; 2143 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2144 goto done_errmsg; 2145 } 2146 } 2147 2148 /* Write the fetched parameters back to userspace. */ 2149 error = 0; 2150 TAILQ_FOREACH(opt, opts, link) { 2151 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2152 pos = 2 * opt->pos + 1; 2153 optuio->uio_iov[pos].iov_len = opt->len; 2154 if (opt->value != NULL) { 2155 if (optuio->uio_segflg == UIO_SYSSPACE) { 2156 bcopy(opt->value, 2157 optuio->uio_iov[pos].iov_base, 2158 opt->len); 2159 } else { 2160 error = copyout(opt->value, 2161 optuio->uio_iov[pos].iov_base, 2162 opt->len); 2163 if (error) 2164 break; 2165 } 2166 } 2167 } 2168 } 2169 goto done_errmsg; 2170 2171 done_deref: 2172 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2173 goto done_errmsg; 2174 2175 done_unlock_list: 2176 sx_sunlock(&allprison_lock); 2177 done_errmsg: 2178 if (error && errmsg_pos >= 0) { 2179 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2180 errmsg_pos = 2 * errmsg_pos + 1; 2181 if (errmsg_len > 0) { 2182 if (optuio->uio_segflg == UIO_SYSSPACE) 2183 bcopy(errmsg, 2184 optuio->uio_iov[errmsg_pos].iov_base, 2185 errmsg_len); 2186 else 2187 copyout(errmsg, 2188 optuio->uio_iov[errmsg_pos].iov_base, 2189 errmsg_len); 2190 } 2191 } 2192 vfs_freeopts(opts); 2193 return (error); 2194 } 2195 2196 2197 /* 2198 * struct jail_remove_args { 2199 * int jid; 2200 * }; 2201 */ 2202 int 2203 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2204 { 2205 struct prison *pr, *cpr, *lpr, *tpr; 2206 int descend, error; 2207 2208 error = priv_check(td, PRIV_JAIL_REMOVE); 2209 if (error) 2210 return (error); 2211 2212 sx_xlock(&allprison_lock); 2213 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2214 if (pr == NULL) { 2215 sx_xunlock(&allprison_lock); 2216 return (EINVAL); 2217 } 2218 2219 /* Remove all descendants of this prison, then remove this prison. */ 2220 pr->pr_ref++; 2221 pr->pr_flags |= PR_REMOVE; 2222 if (!LIST_EMPTY(&pr->pr_children)) { 2223 mtx_unlock(&pr->pr_mtx); 2224 lpr = NULL; 2225 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2226 mtx_lock(&cpr->pr_mtx); 2227 if (cpr->pr_ref > 0) { 2228 tpr = cpr; 2229 cpr->pr_ref++; 2230 cpr->pr_flags |= PR_REMOVE; 2231 } else { 2232 /* Already removed - do not do it again. */ 2233 tpr = NULL; 2234 } 2235 mtx_unlock(&cpr->pr_mtx); 2236 if (lpr != NULL) { 2237 mtx_lock(&lpr->pr_mtx); 2238 prison_remove_one(lpr); 2239 sx_xlock(&allprison_lock); 2240 } 2241 lpr = tpr; 2242 } 2243 if (lpr != NULL) { 2244 mtx_lock(&lpr->pr_mtx); 2245 prison_remove_one(lpr); 2246 sx_xlock(&allprison_lock); 2247 } 2248 mtx_lock(&pr->pr_mtx); 2249 } 2250 prison_remove_one(pr); 2251 return (0); 2252 } 2253 2254 static void 2255 prison_remove_one(struct prison *pr) 2256 { 2257 struct proc *p; 2258 int deuref; 2259 2260 /* If the prison was persistent, it is not anymore. */ 2261 deuref = 0; 2262 if (pr->pr_flags & PR_PERSIST) { 2263 pr->pr_ref--; 2264 deuref = PD_DEUREF; 2265 pr->pr_flags &= ~PR_PERSIST; 2266 } 2267 2268 /* 2269 * jail_remove added a reference. If that's the only one, remove 2270 * the prison now. 2271 */ 2272 KASSERT(pr->pr_ref > 0, 2273 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2274 if (pr->pr_ref == 1) { 2275 prison_deref(pr, 2276 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2277 return; 2278 } 2279 2280 mtx_unlock(&pr->pr_mtx); 2281 sx_xunlock(&allprison_lock); 2282 /* 2283 * Kill all processes unfortunate enough to be attached to this prison. 2284 */ 2285 sx_slock(&allproc_lock); 2286 LIST_FOREACH(p, &allproc, p_list) { 2287 PROC_LOCK(p); 2288 if (p->p_state != PRS_NEW && p->p_ucred && 2289 p->p_ucred->cr_prison == pr) 2290 kern_psignal(p, SIGKILL); 2291 PROC_UNLOCK(p); 2292 } 2293 sx_sunlock(&allproc_lock); 2294 /* Remove the temporary reference added by jail_remove. */ 2295 prison_deref(pr, deuref | PD_DEREF); 2296 } 2297 2298 2299 /* 2300 * struct jail_attach_args { 2301 * int jid; 2302 * }; 2303 */ 2304 int 2305 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2306 { 2307 struct prison *pr; 2308 int error; 2309 2310 error = priv_check(td, PRIV_JAIL_ATTACH); 2311 if (error) 2312 return (error); 2313 2314 sx_slock(&allprison_lock); 2315 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2316 if (pr == NULL) { 2317 sx_sunlock(&allprison_lock); 2318 return (EINVAL); 2319 } 2320 2321 /* 2322 * Do not allow a process to attach to a prison that is not 2323 * considered to be "alive". 2324 */ 2325 if (pr->pr_uref == 0) { 2326 mtx_unlock(&pr->pr_mtx); 2327 sx_sunlock(&allprison_lock); 2328 return (EINVAL); 2329 } 2330 2331 return (do_jail_attach(td, pr)); 2332 } 2333 2334 static int 2335 do_jail_attach(struct thread *td, struct prison *pr) 2336 { 2337 struct prison *ppr; 2338 struct proc *p; 2339 struct ucred *newcred, *oldcred; 2340 int vfslocked, error; 2341 2342 /* 2343 * XXX: Note that there is a slight race here if two threads 2344 * in the same privileged process attempt to attach to two 2345 * different jails at the same time. It is important for 2346 * user processes not to do this, or they might end up with 2347 * a process root from one prison, but attached to the jail 2348 * of another. 2349 */ 2350 pr->pr_ref++; 2351 pr->pr_uref++; 2352 mtx_unlock(&pr->pr_mtx); 2353 2354 /* Let modules do whatever they need to prepare for attaching. */ 2355 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2356 if (error) { 2357 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2358 return (error); 2359 } 2360 sx_sunlock(&allprison_lock); 2361 2362 /* 2363 * Reparent the newly attached process to this jail. 2364 */ 2365 ppr = td->td_ucred->cr_prison; 2366 p = td->td_proc; 2367 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2368 if (error) 2369 goto e_revert_osd; 2370 2371 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount); 2372 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2373 if ((error = change_dir(pr->pr_root, td)) != 0) 2374 goto e_unlock; 2375 #ifdef MAC 2376 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2377 goto e_unlock; 2378 #endif 2379 VOP_UNLOCK(pr->pr_root, 0); 2380 if ((error = change_root(pr->pr_root, td))) 2381 goto e_unlock_giant; 2382 VFS_UNLOCK_GIANT(vfslocked); 2383 2384 newcred = crget(); 2385 PROC_LOCK(p); 2386 oldcred = p->p_ucred; 2387 setsugid(p); 2388 crcopy(newcred, oldcred); 2389 newcred->cr_prison = pr; 2390 p->p_ucred = newcred; 2391 PROC_UNLOCK(p); 2392 #ifdef RACCT 2393 racct_proc_ucred_changed(p, oldcred, newcred); 2394 #endif 2395 crfree(oldcred); 2396 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2397 return (0); 2398 e_unlock: 2399 VOP_UNLOCK(pr->pr_root, 0); 2400 e_unlock_giant: 2401 VFS_UNLOCK_GIANT(vfslocked); 2402 e_revert_osd: 2403 /* Tell modules this thread is still in its old jail after all. */ 2404 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2405 prison_deref(pr, PD_DEREF | PD_DEUREF); 2406 return (error); 2407 } 2408 2409 2410 /* 2411 * Returns a locked prison instance, or NULL on failure. 2412 */ 2413 struct prison * 2414 prison_find(int prid) 2415 { 2416 struct prison *pr; 2417 2418 sx_assert(&allprison_lock, SX_LOCKED); 2419 TAILQ_FOREACH(pr, &allprison, pr_list) { 2420 if (pr->pr_id == prid) { 2421 mtx_lock(&pr->pr_mtx); 2422 if (pr->pr_ref > 0) 2423 return (pr); 2424 mtx_unlock(&pr->pr_mtx); 2425 } 2426 } 2427 return (NULL); 2428 } 2429 2430 /* 2431 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2432 */ 2433 struct prison * 2434 prison_find_child(struct prison *mypr, int prid) 2435 { 2436 struct prison *pr; 2437 int descend; 2438 2439 sx_assert(&allprison_lock, SX_LOCKED); 2440 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2441 if (pr->pr_id == prid) { 2442 mtx_lock(&pr->pr_mtx); 2443 if (pr->pr_ref > 0) 2444 return (pr); 2445 mtx_unlock(&pr->pr_mtx); 2446 } 2447 } 2448 return (NULL); 2449 } 2450 2451 /* 2452 * Look for the name relative to mypr. Returns a locked prison or NULL. 2453 */ 2454 struct prison * 2455 prison_find_name(struct prison *mypr, const char *name) 2456 { 2457 struct prison *pr, *deadpr; 2458 size_t mylen; 2459 int descend; 2460 2461 sx_assert(&allprison_lock, SX_LOCKED); 2462 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2463 again: 2464 deadpr = NULL; 2465 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2466 if (!strcmp(pr->pr_name + mylen, name)) { 2467 mtx_lock(&pr->pr_mtx); 2468 if (pr->pr_ref > 0) { 2469 if (pr->pr_uref > 0) 2470 return (pr); 2471 deadpr = pr; 2472 } 2473 mtx_unlock(&pr->pr_mtx); 2474 } 2475 } 2476 /* There was no valid prison - perhaps there was a dying one. */ 2477 if (deadpr != NULL) { 2478 mtx_lock(&deadpr->pr_mtx); 2479 if (deadpr->pr_ref == 0) { 2480 mtx_unlock(&deadpr->pr_mtx); 2481 goto again; 2482 } 2483 } 2484 return (deadpr); 2485 } 2486 2487 /* 2488 * See if a prison has the specific flag set. 2489 */ 2490 int 2491 prison_flag(struct ucred *cred, unsigned flag) 2492 { 2493 2494 /* This is an atomic read, so no locking is necessary. */ 2495 return (cred->cr_prison->pr_flags & flag); 2496 } 2497 2498 int 2499 prison_allow(struct ucred *cred, unsigned flag) 2500 { 2501 2502 /* This is an atomic read, so no locking is necessary. */ 2503 return (cred->cr_prison->pr_allow & flag); 2504 } 2505 2506 /* 2507 * Remove a prison reference. If that was the last reference, remove the 2508 * prison itself - but not in this context in case there are locks held. 2509 */ 2510 void 2511 prison_free_locked(struct prison *pr) 2512 { 2513 2514 mtx_assert(&pr->pr_mtx, MA_OWNED); 2515 pr->pr_ref--; 2516 if (pr->pr_ref == 0) { 2517 mtx_unlock(&pr->pr_mtx); 2518 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2519 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2520 return; 2521 } 2522 mtx_unlock(&pr->pr_mtx); 2523 } 2524 2525 void 2526 prison_free(struct prison *pr) 2527 { 2528 2529 mtx_lock(&pr->pr_mtx); 2530 prison_free_locked(pr); 2531 } 2532 2533 static void 2534 prison_complete(void *context, int pending) 2535 { 2536 2537 prison_deref((struct prison *)context, 0); 2538 } 2539 2540 /* 2541 * Remove a prison reference (usually). This internal version assumes no 2542 * mutexes are held, except perhaps the prison itself. If there are no more 2543 * references, release and delist the prison. On completion, the prison lock 2544 * and the allprison lock are both unlocked. 2545 */ 2546 static void 2547 prison_deref(struct prison *pr, int flags) 2548 { 2549 struct prison *ppr, *tpr; 2550 int vfslocked; 2551 2552 if (!(flags & PD_LOCKED)) 2553 mtx_lock(&pr->pr_mtx); 2554 for (;;) { 2555 if (flags & PD_DEUREF) { 2556 pr->pr_uref--; 2557 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2558 } 2559 if (flags & PD_DEREF) 2560 pr->pr_ref--; 2561 /* If the prison still has references, nothing else to do. */ 2562 if (pr->pr_ref > 0) { 2563 mtx_unlock(&pr->pr_mtx); 2564 if (flags & PD_LIST_SLOCKED) 2565 sx_sunlock(&allprison_lock); 2566 else if (flags & PD_LIST_XLOCKED) 2567 sx_xunlock(&allprison_lock); 2568 return; 2569 } 2570 2571 mtx_unlock(&pr->pr_mtx); 2572 if (flags & PD_LIST_SLOCKED) { 2573 if (!sx_try_upgrade(&allprison_lock)) { 2574 sx_sunlock(&allprison_lock); 2575 sx_xlock(&allprison_lock); 2576 } 2577 } else if (!(flags & PD_LIST_XLOCKED)) 2578 sx_xlock(&allprison_lock); 2579 2580 TAILQ_REMOVE(&allprison, pr, pr_list); 2581 LIST_REMOVE(pr, pr_sibling); 2582 ppr = pr->pr_parent; 2583 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2584 tpr->pr_childcount--; 2585 sx_xunlock(&allprison_lock); 2586 2587 #ifdef VIMAGE 2588 if (pr->pr_vnet != ppr->pr_vnet) 2589 vnet_destroy(pr->pr_vnet); 2590 #endif 2591 if (pr->pr_root != NULL) { 2592 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount); 2593 vrele(pr->pr_root); 2594 VFS_UNLOCK_GIANT(vfslocked); 2595 } 2596 mtx_destroy(&pr->pr_mtx); 2597 #ifdef INET 2598 free(pr->pr_ip4, M_PRISON); 2599 #endif 2600 #ifdef INET6 2601 free(pr->pr_ip6, M_PRISON); 2602 #endif 2603 if (pr->pr_cpuset != NULL) 2604 cpuset_rel(pr->pr_cpuset); 2605 osd_jail_exit(pr); 2606 #ifdef RACCT 2607 prison_racct_detach(pr); 2608 #endif 2609 free(pr, M_PRISON); 2610 2611 /* Removing a prison frees a reference on its parent. */ 2612 pr = ppr; 2613 mtx_lock(&pr->pr_mtx); 2614 flags = PD_DEREF | PD_DEUREF; 2615 } 2616 } 2617 2618 void 2619 prison_hold_locked(struct prison *pr) 2620 { 2621 2622 mtx_assert(&pr->pr_mtx, MA_OWNED); 2623 KASSERT(pr->pr_ref > 0, 2624 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2625 pr->pr_ref++; 2626 } 2627 2628 void 2629 prison_hold(struct prison *pr) 2630 { 2631 2632 mtx_lock(&pr->pr_mtx); 2633 prison_hold_locked(pr); 2634 mtx_unlock(&pr->pr_mtx); 2635 } 2636 2637 void 2638 prison_proc_hold(struct prison *pr) 2639 { 2640 2641 mtx_lock(&pr->pr_mtx); 2642 KASSERT(pr->pr_uref > 0, 2643 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2644 pr->pr_uref++; 2645 mtx_unlock(&pr->pr_mtx); 2646 } 2647 2648 void 2649 prison_proc_free(struct prison *pr) 2650 { 2651 2652 mtx_lock(&pr->pr_mtx); 2653 KASSERT(pr->pr_uref > 0, 2654 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2655 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2656 } 2657 2658 2659 #ifdef INET 2660 /* 2661 * Restrict a prison's IP address list with its parent's, possibly replacing 2662 * it. Return true if the replacement buffer was used (or would have been). 2663 */ 2664 static int 2665 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2666 { 2667 int ii, ij, used; 2668 struct prison *ppr; 2669 2670 ppr = pr->pr_parent; 2671 if (!(pr->pr_flags & PR_IP4_USER)) { 2672 /* This has no user settings, so just copy the parent's list. */ 2673 if (pr->pr_ip4s < ppr->pr_ip4s) { 2674 /* 2675 * There's no room for the parent's list. Use the 2676 * new list buffer, which is assumed to be big enough 2677 * (if it was passed). If there's no buffer, try to 2678 * allocate one. 2679 */ 2680 used = 1; 2681 if (newip4 == NULL) { 2682 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2683 M_PRISON, M_NOWAIT); 2684 if (newip4 != NULL) 2685 used = 0; 2686 } 2687 if (newip4 != NULL) { 2688 bcopy(ppr->pr_ip4, newip4, 2689 ppr->pr_ip4s * sizeof(*newip4)); 2690 free(pr->pr_ip4, M_PRISON); 2691 pr->pr_ip4 = newip4; 2692 pr->pr_ip4s = ppr->pr_ip4s; 2693 } 2694 return (used); 2695 } 2696 pr->pr_ip4s = ppr->pr_ip4s; 2697 if (pr->pr_ip4s > 0) 2698 bcopy(ppr->pr_ip4, pr->pr_ip4, 2699 pr->pr_ip4s * sizeof(*newip4)); 2700 else if (pr->pr_ip4 != NULL) { 2701 free(pr->pr_ip4, M_PRISON); 2702 pr->pr_ip4 = NULL; 2703 } 2704 } else if (pr->pr_ip4s > 0) { 2705 /* Remove addresses that aren't in the parent. */ 2706 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2707 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2708 break; 2709 if (ij < ppr->pr_ip4s) 2710 ii = 1; 2711 else { 2712 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2713 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2714 ii = 0; 2715 } 2716 for (ij = 1; ii < pr->pr_ip4s; ) { 2717 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2718 ii++; 2719 continue; 2720 } 2721 switch (ij >= ppr->pr_ip4s ? -1 : 2722 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2723 case -1: 2724 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2725 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2726 break; 2727 case 0: 2728 ii++; 2729 ij++; 2730 break; 2731 case 1: 2732 ij++; 2733 break; 2734 } 2735 } 2736 if (pr->pr_ip4s == 0) { 2737 pr->pr_flags |= PR_IP4_DISABLE; 2738 free(pr->pr_ip4, M_PRISON); 2739 pr->pr_ip4 = NULL; 2740 } 2741 } 2742 return (0); 2743 } 2744 2745 /* 2746 * Pass back primary IPv4 address of this jail. 2747 * 2748 * If not restricted return success but do not alter the address. Caller has 2749 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2750 * 2751 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2752 * Address returned in NBO. 2753 */ 2754 int 2755 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2756 { 2757 struct prison *pr; 2758 2759 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2760 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2761 2762 pr = cred->cr_prison; 2763 if (!(pr->pr_flags & PR_IP4)) 2764 return (0); 2765 mtx_lock(&pr->pr_mtx); 2766 if (!(pr->pr_flags & PR_IP4)) { 2767 mtx_unlock(&pr->pr_mtx); 2768 return (0); 2769 } 2770 if (pr->pr_ip4 == NULL) { 2771 mtx_unlock(&pr->pr_mtx); 2772 return (EAFNOSUPPORT); 2773 } 2774 2775 ia->s_addr = pr->pr_ip4[0].s_addr; 2776 mtx_unlock(&pr->pr_mtx); 2777 return (0); 2778 } 2779 2780 /* 2781 * Return 1 if we should do proper source address selection or are not jailed. 2782 * We will return 0 if we should bypass source address selection in favour 2783 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2784 * returned in NBO. 2785 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2786 */ 2787 int 2788 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2789 { 2790 struct prison *pr; 2791 struct in_addr lia; 2792 int error; 2793 2794 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2795 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2796 2797 if (!jailed(cred)) 2798 return (1); 2799 2800 pr = cred->cr_prison; 2801 if (pr->pr_flags & PR_IP4_SADDRSEL) 2802 return (1); 2803 2804 lia.s_addr = INADDR_ANY; 2805 error = prison_get_ip4(cred, &lia); 2806 if (error) 2807 return (error); 2808 if (lia.s_addr == INADDR_ANY) 2809 return (1); 2810 2811 ia->s_addr = lia.s_addr; 2812 return (0); 2813 } 2814 2815 /* 2816 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2817 */ 2818 int 2819 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2820 { 2821 2822 if (pr1 == pr2) 2823 return (1); 2824 2825 /* 2826 * No need to lock since the PR_IP4_USER flag can't be altered for 2827 * existing prisons. 2828 */ 2829 while (pr1 != &prison0 && 2830 #ifdef VIMAGE 2831 !(pr1->pr_flags & PR_VNET) && 2832 #endif 2833 !(pr1->pr_flags & PR_IP4_USER)) 2834 pr1 = pr1->pr_parent; 2835 while (pr2 != &prison0 && 2836 #ifdef VIMAGE 2837 !(pr2->pr_flags & PR_VNET) && 2838 #endif 2839 !(pr2->pr_flags & PR_IP4_USER)) 2840 pr2 = pr2->pr_parent; 2841 return (pr1 == pr2); 2842 } 2843 2844 /* 2845 * Make sure our (source) address is set to something meaningful to this 2846 * jail. 2847 * 2848 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2849 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2850 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2851 */ 2852 int 2853 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2854 { 2855 struct prison *pr; 2856 struct in_addr ia0; 2857 int error; 2858 2859 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2860 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2861 2862 pr = cred->cr_prison; 2863 if (!(pr->pr_flags & PR_IP4)) 2864 return (0); 2865 mtx_lock(&pr->pr_mtx); 2866 if (!(pr->pr_flags & PR_IP4)) { 2867 mtx_unlock(&pr->pr_mtx); 2868 return (0); 2869 } 2870 if (pr->pr_ip4 == NULL) { 2871 mtx_unlock(&pr->pr_mtx); 2872 return (EAFNOSUPPORT); 2873 } 2874 2875 ia0.s_addr = ntohl(ia->s_addr); 2876 if (ia0.s_addr == INADDR_LOOPBACK) { 2877 ia->s_addr = pr->pr_ip4[0].s_addr; 2878 mtx_unlock(&pr->pr_mtx); 2879 return (0); 2880 } 2881 2882 if (ia0.s_addr == INADDR_ANY) { 2883 /* 2884 * In case there is only 1 IPv4 address, bind directly. 2885 */ 2886 if (pr->pr_ip4s == 1) 2887 ia->s_addr = pr->pr_ip4[0].s_addr; 2888 mtx_unlock(&pr->pr_mtx); 2889 return (0); 2890 } 2891 2892 error = _prison_check_ip4(pr, ia); 2893 mtx_unlock(&pr->pr_mtx); 2894 return (error); 2895 } 2896 2897 /* 2898 * Rewrite destination address in case we will connect to loopback address. 2899 * 2900 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2901 * Address passed in in NBO and returned in NBO. 2902 */ 2903 int 2904 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2905 { 2906 struct prison *pr; 2907 2908 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2909 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2910 2911 pr = cred->cr_prison; 2912 if (!(pr->pr_flags & PR_IP4)) 2913 return (0); 2914 mtx_lock(&pr->pr_mtx); 2915 if (!(pr->pr_flags & PR_IP4)) { 2916 mtx_unlock(&pr->pr_mtx); 2917 return (0); 2918 } 2919 if (pr->pr_ip4 == NULL) { 2920 mtx_unlock(&pr->pr_mtx); 2921 return (EAFNOSUPPORT); 2922 } 2923 2924 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2925 ia->s_addr = pr->pr_ip4[0].s_addr; 2926 mtx_unlock(&pr->pr_mtx); 2927 return (0); 2928 } 2929 2930 /* 2931 * Return success because nothing had to be changed. 2932 */ 2933 mtx_unlock(&pr->pr_mtx); 2934 return (0); 2935 } 2936 2937 /* 2938 * Check if given address belongs to the jail referenced by cred/prison. 2939 * 2940 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2941 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2942 * doesn't allow IPv4. Address passed in in NBO. 2943 */ 2944 static int 2945 _prison_check_ip4(struct prison *pr, struct in_addr *ia) 2946 { 2947 int i, a, z, d; 2948 2949 /* 2950 * Check the primary IP. 2951 */ 2952 if (pr->pr_ip4[0].s_addr == ia->s_addr) 2953 return (0); 2954 2955 /* 2956 * All the other IPs are sorted so we can do a binary search. 2957 */ 2958 a = 0; 2959 z = pr->pr_ip4s - 2; 2960 while (a <= z) { 2961 i = (a + z) / 2; 2962 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 2963 if (d > 0) 2964 z = i - 1; 2965 else if (d < 0) 2966 a = i + 1; 2967 else 2968 return (0); 2969 } 2970 2971 return (EADDRNOTAVAIL); 2972 } 2973 2974 int 2975 prison_check_ip4(struct ucred *cred, struct in_addr *ia) 2976 { 2977 struct prison *pr; 2978 int error; 2979 2980 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2981 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2982 2983 pr = cred->cr_prison; 2984 if (!(pr->pr_flags & PR_IP4)) 2985 return (0); 2986 mtx_lock(&pr->pr_mtx); 2987 if (!(pr->pr_flags & PR_IP4)) { 2988 mtx_unlock(&pr->pr_mtx); 2989 return (0); 2990 } 2991 if (pr->pr_ip4 == NULL) { 2992 mtx_unlock(&pr->pr_mtx); 2993 return (EAFNOSUPPORT); 2994 } 2995 2996 error = _prison_check_ip4(pr, ia); 2997 mtx_unlock(&pr->pr_mtx); 2998 return (error); 2999 } 3000 #endif 3001 3002 #ifdef INET6 3003 static int 3004 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 3005 { 3006 int ii, ij, used; 3007 struct prison *ppr; 3008 3009 ppr = pr->pr_parent; 3010 if (!(pr->pr_flags & PR_IP6_USER)) { 3011 /* This has no user settings, so just copy the parent's list. */ 3012 if (pr->pr_ip6s < ppr->pr_ip6s) { 3013 /* 3014 * There's no room for the parent's list. Use the 3015 * new list buffer, which is assumed to be big enough 3016 * (if it was passed). If there's no buffer, try to 3017 * allocate one. 3018 */ 3019 used = 1; 3020 if (newip6 == NULL) { 3021 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 3022 M_PRISON, M_NOWAIT); 3023 if (newip6 != NULL) 3024 used = 0; 3025 } 3026 if (newip6 != NULL) { 3027 bcopy(ppr->pr_ip6, newip6, 3028 ppr->pr_ip6s * sizeof(*newip6)); 3029 free(pr->pr_ip6, M_PRISON); 3030 pr->pr_ip6 = newip6; 3031 pr->pr_ip6s = ppr->pr_ip6s; 3032 } 3033 return (used); 3034 } 3035 pr->pr_ip6s = ppr->pr_ip6s; 3036 if (pr->pr_ip6s > 0) 3037 bcopy(ppr->pr_ip6, pr->pr_ip6, 3038 pr->pr_ip6s * sizeof(*newip6)); 3039 else if (pr->pr_ip6 != NULL) { 3040 free(pr->pr_ip6, M_PRISON); 3041 pr->pr_ip6 = NULL; 3042 } 3043 } else if (pr->pr_ip6s > 0) { 3044 /* Remove addresses that aren't in the parent. */ 3045 for (ij = 0; ij < ppr->pr_ip6s; ij++) 3046 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 3047 &ppr->pr_ip6[ij])) 3048 break; 3049 if (ij < ppr->pr_ip6s) 3050 ii = 1; 3051 else { 3052 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 3053 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 3054 ii = 0; 3055 } 3056 for (ij = 1; ii < pr->pr_ip6s; ) { 3057 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 3058 &ppr->pr_ip6[0])) { 3059 ii++; 3060 continue; 3061 } 3062 switch (ij >= ppr->pr_ip4s ? -1 : 3063 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 3064 case -1: 3065 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 3066 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 3067 break; 3068 case 0: 3069 ii++; 3070 ij++; 3071 break; 3072 case 1: 3073 ij++; 3074 break; 3075 } 3076 } 3077 if (pr->pr_ip6s == 0) { 3078 pr->pr_flags |= PR_IP6_DISABLE; 3079 free(pr->pr_ip6, M_PRISON); 3080 pr->pr_ip6 = NULL; 3081 } 3082 } 3083 return 0; 3084 } 3085 3086 /* 3087 * Pass back primary IPv6 address for this jail. 3088 * 3089 * If not restricted return success but do not alter the address. Caller has 3090 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3091 * 3092 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3093 */ 3094 int 3095 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3096 { 3097 struct prison *pr; 3098 3099 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3100 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3101 3102 pr = cred->cr_prison; 3103 if (!(pr->pr_flags & PR_IP6)) 3104 return (0); 3105 mtx_lock(&pr->pr_mtx); 3106 if (!(pr->pr_flags & PR_IP6)) { 3107 mtx_unlock(&pr->pr_mtx); 3108 return (0); 3109 } 3110 if (pr->pr_ip6 == NULL) { 3111 mtx_unlock(&pr->pr_mtx); 3112 return (EAFNOSUPPORT); 3113 } 3114 3115 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3116 mtx_unlock(&pr->pr_mtx); 3117 return (0); 3118 } 3119 3120 /* 3121 * Return 1 if we should do proper source address selection or are not jailed. 3122 * We will return 0 if we should bypass source address selection in favour 3123 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3124 * returned in NBO. 3125 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3126 */ 3127 int 3128 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3129 { 3130 struct prison *pr; 3131 struct in6_addr lia6; 3132 int error; 3133 3134 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3135 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3136 3137 if (!jailed(cred)) 3138 return (1); 3139 3140 pr = cred->cr_prison; 3141 if (pr->pr_flags & PR_IP6_SADDRSEL) 3142 return (1); 3143 3144 lia6 = in6addr_any; 3145 error = prison_get_ip6(cred, &lia6); 3146 if (error) 3147 return (error); 3148 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3149 return (1); 3150 3151 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3152 return (0); 3153 } 3154 3155 /* 3156 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3157 */ 3158 int 3159 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3160 { 3161 3162 if (pr1 == pr2) 3163 return (1); 3164 3165 while (pr1 != &prison0 && 3166 #ifdef VIMAGE 3167 !(pr1->pr_flags & PR_VNET) && 3168 #endif 3169 !(pr1->pr_flags & PR_IP6_USER)) 3170 pr1 = pr1->pr_parent; 3171 while (pr2 != &prison0 && 3172 #ifdef VIMAGE 3173 !(pr2->pr_flags & PR_VNET) && 3174 #endif 3175 !(pr2->pr_flags & PR_IP6_USER)) 3176 pr2 = pr2->pr_parent; 3177 return (pr1 == pr2); 3178 } 3179 3180 /* 3181 * Make sure our (source) address is set to something meaningful to this jail. 3182 * 3183 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3184 * when needed while binding. 3185 * 3186 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3187 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3188 * doesn't allow IPv6. 3189 */ 3190 int 3191 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3192 { 3193 struct prison *pr; 3194 int error; 3195 3196 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3197 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3198 3199 pr = cred->cr_prison; 3200 if (!(pr->pr_flags & PR_IP6)) 3201 return (0); 3202 mtx_lock(&pr->pr_mtx); 3203 if (!(pr->pr_flags & PR_IP6)) { 3204 mtx_unlock(&pr->pr_mtx); 3205 return (0); 3206 } 3207 if (pr->pr_ip6 == NULL) { 3208 mtx_unlock(&pr->pr_mtx); 3209 return (EAFNOSUPPORT); 3210 } 3211 3212 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3213 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3214 mtx_unlock(&pr->pr_mtx); 3215 return (0); 3216 } 3217 3218 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3219 /* 3220 * In case there is only 1 IPv6 address, and v6only is true, 3221 * then bind directly. 3222 */ 3223 if (v6only != 0 && pr->pr_ip6s == 1) 3224 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3225 mtx_unlock(&pr->pr_mtx); 3226 return (0); 3227 } 3228 3229 error = _prison_check_ip6(pr, ia6); 3230 mtx_unlock(&pr->pr_mtx); 3231 return (error); 3232 } 3233 3234 /* 3235 * Rewrite destination address in case we will connect to loopback address. 3236 * 3237 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3238 */ 3239 int 3240 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3241 { 3242 struct prison *pr; 3243 3244 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3245 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3246 3247 pr = cred->cr_prison; 3248 if (!(pr->pr_flags & PR_IP6)) 3249 return (0); 3250 mtx_lock(&pr->pr_mtx); 3251 if (!(pr->pr_flags & PR_IP6)) { 3252 mtx_unlock(&pr->pr_mtx); 3253 return (0); 3254 } 3255 if (pr->pr_ip6 == NULL) { 3256 mtx_unlock(&pr->pr_mtx); 3257 return (EAFNOSUPPORT); 3258 } 3259 3260 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3261 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3262 mtx_unlock(&pr->pr_mtx); 3263 return (0); 3264 } 3265 3266 /* 3267 * Return success because nothing had to be changed. 3268 */ 3269 mtx_unlock(&pr->pr_mtx); 3270 return (0); 3271 } 3272 3273 /* 3274 * Check if given address belongs to the jail referenced by cred/prison. 3275 * 3276 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3277 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3278 * doesn't allow IPv6. 3279 */ 3280 static int 3281 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3282 { 3283 int i, a, z, d; 3284 3285 /* 3286 * Check the primary IP. 3287 */ 3288 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3289 return (0); 3290 3291 /* 3292 * All the other IPs are sorted so we can do a binary search. 3293 */ 3294 a = 0; 3295 z = pr->pr_ip6s - 2; 3296 while (a <= z) { 3297 i = (a + z) / 2; 3298 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3299 if (d > 0) 3300 z = i - 1; 3301 else if (d < 0) 3302 a = i + 1; 3303 else 3304 return (0); 3305 } 3306 3307 return (EADDRNOTAVAIL); 3308 } 3309 3310 int 3311 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3312 { 3313 struct prison *pr; 3314 int error; 3315 3316 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3317 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3318 3319 pr = cred->cr_prison; 3320 if (!(pr->pr_flags & PR_IP6)) 3321 return (0); 3322 mtx_lock(&pr->pr_mtx); 3323 if (!(pr->pr_flags & PR_IP6)) { 3324 mtx_unlock(&pr->pr_mtx); 3325 return (0); 3326 } 3327 if (pr->pr_ip6 == NULL) { 3328 mtx_unlock(&pr->pr_mtx); 3329 return (EAFNOSUPPORT); 3330 } 3331 3332 error = _prison_check_ip6(pr, ia6); 3333 mtx_unlock(&pr->pr_mtx); 3334 return (error); 3335 } 3336 #endif 3337 3338 /* 3339 * Check if a jail supports the given address family. 3340 * 3341 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3342 * if not. 3343 */ 3344 int 3345 prison_check_af(struct ucred *cred, int af) 3346 { 3347 struct prison *pr; 3348 int error; 3349 3350 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3351 3352 pr = cred->cr_prison; 3353 #ifdef VIMAGE 3354 /* Prisons with their own network stack are not limited. */ 3355 if (prison_owns_vnet(cred)) 3356 return (0); 3357 #endif 3358 3359 error = 0; 3360 switch (af) 3361 { 3362 #ifdef INET 3363 case AF_INET: 3364 if (pr->pr_flags & PR_IP4) 3365 { 3366 mtx_lock(&pr->pr_mtx); 3367 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3368 error = EAFNOSUPPORT; 3369 mtx_unlock(&pr->pr_mtx); 3370 } 3371 break; 3372 #endif 3373 #ifdef INET6 3374 case AF_INET6: 3375 if (pr->pr_flags & PR_IP6) 3376 { 3377 mtx_lock(&pr->pr_mtx); 3378 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3379 error = EAFNOSUPPORT; 3380 mtx_unlock(&pr->pr_mtx); 3381 } 3382 break; 3383 #endif 3384 case AF_LOCAL: 3385 case AF_ROUTE: 3386 break; 3387 default: 3388 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3389 error = EAFNOSUPPORT; 3390 } 3391 return (error); 3392 } 3393 3394 /* 3395 * Check if given address belongs to the jail referenced by cred (wrapper to 3396 * prison_check_ip[46]). 3397 * 3398 * Returns 0 if jail doesn't restrict the address family or if address belongs 3399 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3400 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3401 */ 3402 int 3403 prison_if(struct ucred *cred, struct sockaddr *sa) 3404 { 3405 #ifdef INET 3406 struct sockaddr_in *sai; 3407 #endif 3408 #ifdef INET6 3409 struct sockaddr_in6 *sai6; 3410 #endif 3411 int error; 3412 3413 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3414 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3415 3416 #ifdef VIMAGE 3417 if (prison_owns_vnet(cred)) 3418 return (0); 3419 #endif 3420 3421 error = 0; 3422 switch (sa->sa_family) 3423 { 3424 #ifdef INET 3425 case AF_INET: 3426 sai = (struct sockaddr_in *)sa; 3427 error = prison_check_ip4(cred, &sai->sin_addr); 3428 break; 3429 #endif 3430 #ifdef INET6 3431 case AF_INET6: 3432 sai6 = (struct sockaddr_in6 *)sa; 3433 error = prison_check_ip6(cred, &sai6->sin6_addr); 3434 break; 3435 #endif 3436 default: 3437 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3438 error = EAFNOSUPPORT; 3439 } 3440 return (error); 3441 } 3442 3443 /* 3444 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3445 */ 3446 int 3447 prison_check(struct ucred *cred1, struct ucred *cred2) 3448 { 3449 3450 return ((cred1->cr_prison == cred2->cr_prison || 3451 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3452 } 3453 3454 /* 3455 * Return 1 if p2 is a child of p1, otherwise 0. 3456 */ 3457 int 3458 prison_ischild(struct prison *pr1, struct prison *pr2) 3459 { 3460 3461 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3462 if (pr1 == pr2) 3463 return (1); 3464 return (0); 3465 } 3466 3467 /* 3468 * Return 1 if the passed credential is in a jail, otherwise 0. 3469 */ 3470 int 3471 jailed(struct ucred *cred) 3472 { 3473 3474 return (cred->cr_prison != &prison0); 3475 } 3476 3477 /* 3478 * Return 1 if the passed credential is in a jail and that jail does not 3479 * have its own virtual network stack, otherwise 0. 3480 */ 3481 int 3482 jailed_without_vnet(struct ucred *cred) 3483 { 3484 3485 if (!jailed(cred)) 3486 return (0); 3487 #ifdef VIMAGE 3488 if (prison_owns_vnet(cred)) 3489 return (0); 3490 #endif 3491 3492 return (1); 3493 } 3494 3495 /* 3496 * Return the correct hostname (domainname, et al) for the passed credential. 3497 */ 3498 void 3499 getcredhostname(struct ucred *cred, char *buf, size_t size) 3500 { 3501 struct prison *pr; 3502 3503 /* 3504 * A NULL credential can be used to shortcut to the physical 3505 * system's hostname. 3506 */ 3507 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3508 mtx_lock(&pr->pr_mtx); 3509 strlcpy(buf, pr->pr_hostname, size); 3510 mtx_unlock(&pr->pr_mtx); 3511 } 3512 3513 void 3514 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3515 { 3516 3517 mtx_lock(&cred->cr_prison->pr_mtx); 3518 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3519 mtx_unlock(&cred->cr_prison->pr_mtx); 3520 } 3521 3522 void 3523 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3524 { 3525 3526 mtx_lock(&cred->cr_prison->pr_mtx); 3527 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3528 mtx_unlock(&cred->cr_prison->pr_mtx); 3529 } 3530 3531 void 3532 getcredhostid(struct ucred *cred, unsigned long *hostid) 3533 { 3534 3535 mtx_lock(&cred->cr_prison->pr_mtx); 3536 *hostid = cred->cr_prison->pr_hostid; 3537 mtx_unlock(&cred->cr_prison->pr_mtx); 3538 } 3539 3540 #ifdef VIMAGE 3541 /* 3542 * Determine whether the prison represented by cred owns 3543 * its vnet rather than having it inherited. 3544 * 3545 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3546 */ 3547 int 3548 prison_owns_vnet(struct ucred *cred) 3549 { 3550 3551 /* 3552 * vnets cannot be added/removed after jail creation, 3553 * so no need to lock here. 3554 */ 3555 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3556 } 3557 #endif 3558 3559 /* 3560 * Determine whether the subject represented by cred can "see" 3561 * status of a mount point. 3562 * Returns: 0 for permitted, ENOENT otherwise. 3563 * XXX: This function should be called cr_canseemount() and should be 3564 * placed in kern_prot.c. 3565 */ 3566 int 3567 prison_canseemount(struct ucred *cred, struct mount *mp) 3568 { 3569 struct prison *pr; 3570 struct statfs *sp; 3571 size_t len; 3572 3573 pr = cred->cr_prison; 3574 if (pr->pr_enforce_statfs == 0) 3575 return (0); 3576 if (pr->pr_root->v_mount == mp) 3577 return (0); 3578 if (pr->pr_enforce_statfs == 2) 3579 return (ENOENT); 3580 /* 3581 * If jail's chroot directory is set to "/" we should be able to see 3582 * all mount-points from inside a jail. 3583 * This is ugly check, but this is the only situation when jail's 3584 * directory ends with '/'. 3585 */ 3586 if (strcmp(pr->pr_path, "/") == 0) 3587 return (0); 3588 len = strlen(pr->pr_path); 3589 sp = &mp->mnt_stat; 3590 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3591 return (ENOENT); 3592 /* 3593 * Be sure that we don't have situation where jail's root directory 3594 * is "/some/path" and mount point is "/some/pathpath". 3595 */ 3596 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3597 return (ENOENT); 3598 return (0); 3599 } 3600 3601 void 3602 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3603 { 3604 char jpath[MAXPATHLEN]; 3605 struct prison *pr; 3606 size_t len; 3607 3608 pr = cred->cr_prison; 3609 if (pr->pr_enforce_statfs == 0) 3610 return; 3611 if (prison_canseemount(cred, mp) != 0) { 3612 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3613 strlcpy(sp->f_mntonname, "[restricted]", 3614 sizeof(sp->f_mntonname)); 3615 return; 3616 } 3617 if (pr->pr_root->v_mount == mp) { 3618 /* 3619 * Clear current buffer data, so we are sure nothing from 3620 * the valid path left there. 3621 */ 3622 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3623 *sp->f_mntonname = '/'; 3624 return; 3625 } 3626 /* 3627 * If jail's chroot directory is set to "/" we should be able to see 3628 * all mount-points from inside a jail. 3629 */ 3630 if (strcmp(pr->pr_path, "/") == 0) 3631 return; 3632 len = strlen(pr->pr_path); 3633 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3634 /* 3635 * Clear current buffer data, so we are sure nothing from 3636 * the valid path left there. 3637 */ 3638 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3639 if (*jpath == '\0') { 3640 /* Should never happen. */ 3641 *sp->f_mntonname = '/'; 3642 } else { 3643 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3644 } 3645 } 3646 3647 /* 3648 * Check with permission for a specific privilege is granted within jail. We 3649 * have a specific list of accepted privileges; the rest are denied. 3650 */ 3651 int 3652 prison_priv_check(struct ucred *cred, int priv) 3653 { 3654 3655 if (!jailed(cred)) 3656 return (0); 3657 3658 #ifdef VIMAGE 3659 /* 3660 * Privileges specific to prisons with a virtual network stack. 3661 * There might be a duplicate entry here in case the privilege 3662 * is only granted conditionally in the legacy jail case. 3663 */ 3664 switch (priv) { 3665 #ifdef notyet 3666 /* 3667 * NFS-specific privileges. 3668 */ 3669 case PRIV_NFS_DAEMON: 3670 case PRIV_NFS_LOCKD: 3671 #endif 3672 /* 3673 * Network stack privileges. 3674 */ 3675 case PRIV_NET_BRIDGE: 3676 case PRIV_NET_GRE: 3677 case PRIV_NET_BPF: 3678 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3679 case PRIV_NET_ROUTE: 3680 case PRIV_NET_TAP: 3681 case PRIV_NET_SETIFMTU: 3682 case PRIV_NET_SETIFFLAGS: 3683 case PRIV_NET_SETIFCAP: 3684 case PRIV_NET_SETIFDESCR: 3685 case PRIV_NET_SETIFNAME : 3686 case PRIV_NET_SETIFMETRIC: 3687 case PRIV_NET_SETIFPHYS: 3688 case PRIV_NET_SETIFMAC: 3689 case PRIV_NET_ADDMULTI: 3690 case PRIV_NET_DELMULTI: 3691 case PRIV_NET_HWIOCTL: 3692 case PRIV_NET_SETLLADDR: 3693 case PRIV_NET_ADDIFGROUP: 3694 case PRIV_NET_DELIFGROUP: 3695 case PRIV_NET_IFCREATE: 3696 case PRIV_NET_IFDESTROY: 3697 case PRIV_NET_ADDIFADDR: 3698 case PRIV_NET_DELIFADDR: 3699 case PRIV_NET_LAGG: 3700 case PRIV_NET_GIF: 3701 case PRIV_NET_SETIFVNET: 3702 case PRIV_NET_SETIFFIB: 3703 3704 /* 3705 * 802.11-related privileges. 3706 */ 3707 case PRIV_NET80211_GETKEY: 3708 #ifdef notyet 3709 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3710 #endif 3711 3712 #ifdef notyet 3713 /* 3714 * AppleTalk privileges. 3715 */ 3716 case PRIV_NETATALK_RESERVEDPORT: 3717 3718 /* 3719 * ATM privileges. 3720 */ 3721 case PRIV_NETATM_CFG: 3722 case PRIV_NETATM_ADD: 3723 case PRIV_NETATM_DEL: 3724 case PRIV_NETATM_SET: 3725 3726 /* 3727 * Bluetooth privileges. 3728 */ 3729 case PRIV_NETBLUETOOTH_RAW: 3730 #endif 3731 3732 /* 3733 * Netgraph and netgraph module privileges. 3734 */ 3735 case PRIV_NETGRAPH_CONTROL: 3736 #ifdef notyet 3737 case PRIV_NETGRAPH_TTY: 3738 #endif 3739 3740 /* 3741 * IPv4 and IPv6 privileges. 3742 */ 3743 case PRIV_NETINET_IPFW: 3744 case PRIV_NETINET_DIVERT: 3745 case PRIV_NETINET_PF: 3746 case PRIV_NETINET_DUMMYNET: 3747 case PRIV_NETINET_CARP: 3748 case PRIV_NETINET_MROUTE: 3749 case PRIV_NETINET_RAW: 3750 case PRIV_NETINET_ADDRCTRL6: 3751 case PRIV_NETINET_ND6: 3752 case PRIV_NETINET_SCOPE6: 3753 case PRIV_NETINET_ALIFETIME6: 3754 case PRIV_NETINET_IPSEC: 3755 case PRIV_NETINET_BINDANY: 3756 3757 #ifdef notyet 3758 /* 3759 * IPX/SPX privileges. 3760 */ 3761 case PRIV_NETIPX_RESERVEDPORT: 3762 case PRIV_NETIPX_RAW: 3763 3764 /* 3765 * NCP privileges. 3766 */ 3767 case PRIV_NETNCP: 3768 3769 /* 3770 * SMB privileges. 3771 */ 3772 case PRIV_NETSMB: 3773 #endif 3774 3775 /* 3776 * No default: or deny here. 3777 * In case of no permit fall through to next switch(). 3778 */ 3779 if (cred->cr_prison->pr_flags & PR_VNET) 3780 return (0); 3781 } 3782 #endif /* VIMAGE */ 3783 3784 switch (priv) { 3785 3786 /* 3787 * Allow ktrace privileges for root in jail. 3788 */ 3789 case PRIV_KTRACE: 3790 3791 #if 0 3792 /* 3793 * Allow jailed processes to configure audit identity and 3794 * submit audit records (login, etc). In the future we may 3795 * want to further refine the relationship between audit and 3796 * jail. 3797 */ 3798 case PRIV_AUDIT_GETAUDIT: 3799 case PRIV_AUDIT_SETAUDIT: 3800 case PRIV_AUDIT_SUBMIT: 3801 #endif 3802 3803 /* 3804 * Allow jailed processes to manipulate process UNIX 3805 * credentials in any way they see fit. 3806 */ 3807 case PRIV_CRED_SETUID: 3808 case PRIV_CRED_SETEUID: 3809 case PRIV_CRED_SETGID: 3810 case PRIV_CRED_SETEGID: 3811 case PRIV_CRED_SETGROUPS: 3812 case PRIV_CRED_SETREUID: 3813 case PRIV_CRED_SETREGID: 3814 case PRIV_CRED_SETRESUID: 3815 case PRIV_CRED_SETRESGID: 3816 3817 /* 3818 * Jail implements visibility constraints already, so allow 3819 * jailed root to override uid/gid-based constraints. 3820 */ 3821 case PRIV_SEEOTHERGIDS: 3822 case PRIV_SEEOTHERUIDS: 3823 3824 /* 3825 * Jail implements inter-process debugging limits already, so 3826 * allow jailed root various debugging privileges. 3827 */ 3828 case PRIV_DEBUG_DIFFCRED: 3829 case PRIV_DEBUG_SUGID: 3830 case PRIV_DEBUG_UNPRIV: 3831 3832 /* 3833 * Allow jail to set various resource limits and login 3834 * properties, and for now, exceed process resource limits. 3835 */ 3836 case PRIV_PROC_LIMIT: 3837 case PRIV_PROC_SETLOGIN: 3838 case PRIV_PROC_SETRLIMIT: 3839 3840 /* 3841 * System V and POSIX IPC privileges are granted in jail. 3842 */ 3843 case PRIV_IPC_READ: 3844 case PRIV_IPC_WRITE: 3845 case PRIV_IPC_ADMIN: 3846 case PRIV_IPC_MSGSIZE: 3847 case PRIV_MQ_ADMIN: 3848 3849 /* 3850 * Jail operations within a jail work on child jails. 3851 */ 3852 case PRIV_JAIL_ATTACH: 3853 case PRIV_JAIL_SET: 3854 case PRIV_JAIL_REMOVE: 3855 3856 /* 3857 * Jail implements its own inter-process limits, so allow 3858 * root processes in jail to change scheduling on other 3859 * processes in the same jail. Likewise for signalling. 3860 */ 3861 case PRIV_SCHED_DIFFCRED: 3862 case PRIV_SCHED_CPUSET: 3863 case PRIV_SIGNAL_DIFFCRED: 3864 case PRIV_SIGNAL_SUGID: 3865 3866 /* 3867 * Allow jailed processes to write to sysctls marked as jail 3868 * writable. 3869 */ 3870 case PRIV_SYSCTL_WRITEJAIL: 3871 3872 /* 3873 * Allow root in jail to manage a variety of quota 3874 * properties. These should likely be conditional on a 3875 * configuration option. 3876 */ 3877 case PRIV_VFS_GETQUOTA: 3878 case PRIV_VFS_SETQUOTA: 3879 3880 /* 3881 * Since Jail relies on chroot() to implement file system 3882 * protections, grant many VFS privileges to root in jail. 3883 * Be careful to exclude mount-related and NFS-related 3884 * privileges. 3885 */ 3886 case PRIV_VFS_READ: 3887 case PRIV_VFS_WRITE: 3888 case PRIV_VFS_ADMIN: 3889 case PRIV_VFS_EXEC: 3890 case PRIV_VFS_LOOKUP: 3891 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3892 case PRIV_VFS_CHFLAGS_DEV: 3893 case PRIV_VFS_CHOWN: 3894 case PRIV_VFS_CHROOT: 3895 case PRIV_VFS_RETAINSUGID: 3896 case PRIV_VFS_FCHROOT: 3897 case PRIV_VFS_LINK: 3898 case PRIV_VFS_SETGID: 3899 case PRIV_VFS_STAT: 3900 case PRIV_VFS_STICKYFILE: 3901 return (0); 3902 3903 /* 3904 * Depending on the global setting, allow privilege of 3905 * setting system flags. 3906 */ 3907 case PRIV_VFS_SYSFLAGS: 3908 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3909 return (0); 3910 else 3911 return (EPERM); 3912 3913 /* 3914 * Depending on the global setting, allow privilege of 3915 * mounting/unmounting file systems. 3916 */ 3917 case PRIV_VFS_MOUNT: 3918 case PRIV_VFS_UNMOUNT: 3919 case PRIV_VFS_MOUNT_NONUSER: 3920 case PRIV_VFS_MOUNT_OWNER: 3921 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3922 cred->cr_prison->pr_enforce_statfs < 2) 3923 return (0); 3924 else 3925 return (EPERM); 3926 3927 /* 3928 * Allow jailed root to bind reserved ports and reuse in-use 3929 * ports. 3930 */ 3931 case PRIV_NETINET_RESERVEDPORT: 3932 case PRIV_NETINET_REUSEPORT: 3933 return (0); 3934 3935 /* 3936 * Allow jailed root to set certian IPv4/6 (option) headers. 3937 */ 3938 case PRIV_NETINET_SETHDROPTS: 3939 return (0); 3940 3941 /* 3942 * Conditionally allow creating raw sockets in jail. 3943 */ 3944 case PRIV_NETINET_RAW: 3945 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3946 return (0); 3947 else 3948 return (EPERM); 3949 3950 /* 3951 * Since jail implements its own visibility limits on netstat 3952 * sysctls, allow getcred. This allows identd to work in 3953 * jail. 3954 */ 3955 case PRIV_NETINET_GETCRED: 3956 return (0); 3957 3958 /* 3959 * Allow jailed root to set loginclass. 3960 */ 3961 case PRIV_PROC_SETLOGINCLASS: 3962 return (0); 3963 3964 default: 3965 /* 3966 * In all remaining cases, deny the privilege request. This 3967 * includes almost all network privileges, many system 3968 * configuration privileges. 3969 */ 3970 return (EPERM); 3971 } 3972 } 3973 3974 /* 3975 * Return the part of pr2's name that is relative to pr1, or the whole name 3976 * if it does not directly follow. 3977 */ 3978 3979 char * 3980 prison_name(struct prison *pr1, struct prison *pr2) 3981 { 3982 char *name; 3983 3984 /* Jails see themselves as "" (if they see themselves at all). */ 3985 if (pr1 == pr2) 3986 return ""; 3987 name = pr2->pr_name; 3988 if (prison_ischild(pr1, pr2)) { 3989 /* 3990 * pr1 isn't locked (and allprison_lock may not be either) 3991 * so its length can't be counted on. But the number of dots 3992 * can be counted on - and counted. 3993 */ 3994 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3995 name = strchr(name, '.') + 1; 3996 } 3997 return (name); 3998 } 3999 4000 /* 4001 * Return the part of pr2's path that is relative to pr1, or the whole path 4002 * if it does not directly follow. 4003 */ 4004 static char * 4005 prison_path(struct prison *pr1, struct prison *pr2) 4006 { 4007 char *path1, *path2; 4008 int len1; 4009 4010 path1 = pr1->pr_path; 4011 path2 = pr2->pr_path; 4012 if (!strcmp(path1, "/")) 4013 return (path2); 4014 len1 = strlen(path1); 4015 if (strncmp(path1, path2, len1)) 4016 return (path2); 4017 if (path2[len1] == '\0') 4018 return "/"; 4019 if (path2[len1] == '/') 4020 return (path2 + len1); 4021 return (path2); 4022 } 4023 4024 4025 /* 4026 * Jail-related sysctls. 4027 */ 4028 SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 4029 "Jails"); 4030 4031 static int 4032 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4033 { 4034 struct xprison *xp; 4035 struct prison *pr, *cpr; 4036 #ifdef INET 4037 struct in_addr *ip4 = NULL; 4038 int ip4s = 0; 4039 #endif 4040 #ifdef INET6 4041 struct in6_addr *ip6 = NULL; 4042 int ip6s = 0; 4043 #endif 4044 int descend, error; 4045 4046 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4047 pr = req->td->td_ucred->cr_prison; 4048 error = 0; 4049 sx_slock(&allprison_lock); 4050 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4051 #if defined(INET) || defined(INET6) 4052 again: 4053 #endif 4054 mtx_lock(&cpr->pr_mtx); 4055 #ifdef INET 4056 if (cpr->pr_ip4s > 0) { 4057 if (ip4s < cpr->pr_ip4s) { 4058 ip4s = cpr->pr_ip4s; 4059 mtx_unlock(&cpr->pr_mtx); 4060 ip4 = realloc(ip4, ip4s * 4061 sizeof(struct in_addr), M_TEMP, M_WAITOK); 4062 goto again; 4063 } 4064 bcopy(cpr->pr_ip4, ip4, 4065 cpr->pr_ip4s * sizeof(struct in_addr)); 4066 } 4067 #endif 4068 #ifdef INET6 4069 if (cpr->pr_ip6s > 0) { 4070 if (ip6s < cpr->pr_ip6s) { 4071 ip6s = cpr->pr_ip6s; 4072 mtx_unlock(&cpr->pr_mtx); 4073 ip6 = realloc(ip6, ip6s * 4074 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 4075 goto again; 4076 } 4077 bcopy(cpr->pr_ip6, ip6, 4078 cpr->pr_ip6s * sizeof(struct in6_addr)); 4079 } 4080 #endif 4081 if (cpr->pr_ref == 0) { 4082 mtx_unlock(&cpr->pr_mtx); 4083 continue; 4084 } 4085 bzero(xp, sizeof(*xp)); 4086 xp->pr_version = XPRISON_VERSION; 4087 xp->pr_id = cpr->pr_id; 4088 xp->pr_state = cpr->pr_uref > 0 4089 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4090 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4091 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4092 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4093 #ifdef INET 4094 xp->pr_ip4s = cpr->pr_ip4s; 4095 #endif 4096 #ifdef INET6 4097 xp->pr_ip6s = cpr->pr_ip6s; 4098 #endif 4099 mtx_unlock(&cpr->pr_mtx); 4100 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4101 if (error) 4102 break; 4103 #ifdef INET 4104 if (xp->pr_ip4s > 0) { 4105 error = SYSCTL_OUT(req, ip4, 4106 xp->pr_ip4s * sizeof(struct in_addr)); 4107 if (error) 4108 break; 4109 } 4110 #endif 4111 #ifdef INET6 4112 if (xp->pr_ip6s > 0) { 4113 error = SYSCTL_OUT(req, ip6, 4114 xp->pr_ip6s * sizeof(struct in6_addr)); 4115 if (error) 4116 break; 4117 } 4118 #endif 4119 } 4120 sx_sunlock(&allprison_lock); 4121 free(xp, M_TEMP); 4122 #ifdef INET 4123 free(ip4, M_TEMP); 4124 #endif 4125 #ifdef INET6 4126 free(ip6, M_TEMP); 4127 #endif 4128 return (error); 4129 } 4130 4131 SYSCTL_OID(_security_jail, OID_AUTO, list, 4132 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4133 sysctl_jail_list, "S", "List of active jails"); 4134 4135 static int 4136 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4137 { 4138 int error, injail; 4139 4140 injail = jailed(req->td->td_ucred); 4141 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4142 4143 return (error); 4144 } 4145 4146 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4147 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4148 sysctl_jail_jailed, "I", "Process in jail?"); 4149 4150 #if defined(INET) || defined(INET6) 4151 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4152 &jail_max_af_ips, 0, 4153 "Number of IP addresses a jail may have at most per address family"); 4154 #endif 4155 4156 /* 4157 * Default parameters for jail(2) compatability. For historical reasons, 4158 * the sysctl names have varying similarity to the parameter names. Prisons 4159 * just see their own parameters, and can't change them. 4160 */ 4161 static int 4162 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4163 { 4164 struct prison *pr; 4165 int allow, error, i; 4166 4167 pr = req->td->td_ucred->cr_prison; 4168 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4169 4170 /* Get the current flag value, and convert it to a boolean. */ 4171 i = (allow & arg2) ? 1 : 0; 4172 if (arg1 != NULL) 4173 i = !i; 4174 error = sysctl_handle_int(oidp, &i, 0, req); 4175 if (error || !req->newptr) 4176 return (error); 4177 i = i ? arg2 : 0; 4178 if (arg1 != NULL) 4179 i ^= arg2; 4180 /* 4181 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4182 * for writing. 4183 */ 4184 mtx_lock(&prison0.pr_mtx); 4185 jail_default_allow = (jail_default_allow & ~arg2) | i; 4186 mtx_unlock(&prison0.pr_mtx); 4187 return (0); 4188 } 4189 4190 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4191 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4192 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4193 "Processes in jail can set their hostnames"); 4194 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4195 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4196 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4197 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 4198 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4199 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4200 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4201 "Processes in jail can use System V IPC primitives"); 4202 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4203 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4204 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4205 "Prison root can create raw sockets"); 4206 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4207 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4208 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4209 "Processes in jail can alter system file flags"); 4210 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4211 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4212 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4213 "Processes in jail can mount/unmount jail-friendly file systems"); 4214 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 4215 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4216 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 4217 "Processes in jail can mount the devfs file system"); 4218 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 4219 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4220 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 4221 "Processes in jail can mount the nullfs file system"); 4222 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 4223 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4224 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 4225 "Processes in jail can mount the procfs file system"); 4226 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 4227 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4228 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 4229 "Processes in jail can mount the zfs file system"); 4230 4231 static int 4232 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4233 { 4234 struct prison *pr; 4235 int level, error; 4236 4237 pr = req->td->td_ucred->cr_prison; 4238 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4239 error = sysctl_handle_int(oidp, &level, 0, req); 4240 if (error || !req->newptr) 4241 return (error); 4242 *(int *)arg1 = level; 4243 return (0); 4244 } 4245 4246 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4247 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4248 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4249 sysctl_jail_default_level, "I", 4250 "Processes in jail cannot see all mounted file systems"); 4251 4252 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4253 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4254 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4255 sysctl_jail_default_level, "I", 4256 "Ruleset for the devfs filesystem in jail"); 4257 4258 /* 4259 * Nodes to describe jail parameters. Maximum length of string parameters 4260 * is returned in the string itself, and the other parameters exist merely 4261 * to make themselves and their types known. 4262 */ 4263 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4264 "Jail parameters"); 4265 4266 int 4267 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4268 { 4269 int i; 4270 long l; 4271 size_t s; 4272 char numbuf[12]; 4273 4274 switch (oidp->oid_kind & CTLTYPE) 4275 { 4276 case CTLTYPE_LONG: 4277 case CTLTYPE_ULONG: 4278 l = 0; 4279 #ifdef SCTL_MASK32 4280 if (!(req->flags & SCTL_MASK32)) 4281 #endif 4282 return (SYSCTL_OUT(req, &l, sizeof(l))); 4283 case CTLTYPE_INT: 4284 case CTLTYPE_UINT: 4285 i = 0; 4286 return (SYSCTL_OUT(req, &i, sizeof(i))); 4287 case CTLTYPE_STRING: 4288 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4289 return 4290 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4291 case CTLTYPE_STRUCT: 4292 s = (size_t)arg2; 4293 return (SYSCTL_OUT(req, &s, sizeof(s))); 4294 } 4295 return (0); 4296 } 4297 4298 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4299 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4300 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4301 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4302 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4303 "I", "Jail secure level"); 4304 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4305 "I", "Jail cannot see all mounted file systems"); 4306 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4307 "I", "Ruleset for in-jail devfs mounts"); 4308 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4309 "B", "Jail persistence"); 4310 #ifdef VIMAGE 4311 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4312 "E,jailsys", "Virtual network stack"); 4313 #endif 4314 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4315 "B", "Jail is in the process of shutting down"); 4316 4317 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4318 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4319 "I", "Current number of child jails"); 4320 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4321 "I", "Maximum number of child jails"); 4322 4323 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4324 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4325 "Jail hostname"); 4326 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4327 "Jail NIS domainname"); 4328 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4329 "Jail host UUID"); 4330 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4331 "LU", "Jail host ID"); 4332 4333 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4334 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4335 4336 #ifdef INET 4337 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4338 "Jail IPv4 address virtualization"); 4339 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4340 "S,in_addr,a", "Jail IPv4 addresses"); 4341 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4342 "B", "Do (not) use IPv4 source address selection rather than the " 4343 "primary jail IPv4 address."); 4344 #endif 4345 #ifdef INET6 4346 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4347 "Jail IPv6 address virtualization"); 4348 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4349 "S,in6_addr,a", "Jail IPv6 addresses"); 4350 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4351 "B", "Do (not) use IPv6 source address selection rather than the " 4352 "primary jail IPv6 address."); 4353 #endif 4354 4355 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4356 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4357 "B", "Jail may set hostname"); 4358 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4359 "B", "Jail may use SYSV IPC"); 4360 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4361 "B", "Jail may create raw sockets"); 4362 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4363 "B", "Jail may alter system file flags"); 4364 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4365 "B", "Jail may set file quotas"); 4366 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4367 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4368 4369 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4370 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4371 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4372 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 4373 "B", "Jail may mount the devfs file system"); 4374 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 4375 "B", "Jail may mount the nullfs file system"); 4376 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 4377 "B", "Jail may mount the procfs file system"); 4378 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 4379 "B", "Jail may mount the zfs file system"); 4380 4381 void 4382 prison_racct_foreach(void (*callback)(struct racct *racct, 4383 void *arg2, void *arg3), void *arg2, void *arg3) 4384 { 4385 struct prison_racct *prr; 4386 4387 sx_slock(&allprison_lock); 4388 LIST_FOREACH(prr, &allprison_racct, prr_next) 4389 (callback)(prr->prr_racct, arg2, arg3); 4390 sx_sunlock(&allprison_lock); 4391 } 4392 4393 static struct prison_racct * 4394 prison_racct_find_locked(const char *name) 4395 { 4396 struct prison_racct *prr; 4397 4398 sx_assert(&allprison_lock, SA_XLOCKED); 4399 4400 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4401 return (NULL); 4402 4403 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4404 if (strcmp(name, prr->prr_name) != 0) 4405 continue; 4406 4407 /* Found prison_racct with a matching name? */ 4408 prison_racct_hold(prr); 4409 return (prr); 4410 } 4411 4412 /* Add new prison_racct. */ 4413 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4414 racct_create(&prr->prr_racct); 4415 4416 strcpy(prr->prr_name, name); 4417 refcount_init(&prr->prr_refcount, 1); 4418 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4419 4420 return (prr); 4421 } 4422 4423 struct prison_racct * 4424 prison_racct_find(const char *name) 4425 { 4426 struct prison_racct *prr; 4427 4428 sx_xlock(&allprison_lock); 4429 prr = prison_racct_find_locked(name); 4430 sx_xunlock(&allprison_lock); 4431 return (prr); 4432 } 4433 4434 void 4435 prison_racct_hold(struct prison_racct *prr) 4436 { 4437 4438 refcount_acquire(&prr->prr_refcount); 4439 } 4440 4441 static void 4442 prison_racct_free_locked(struct prison_racct *prr) 4443 { 4444 4445 sx_assert(&allprison_lock, SA_XLOCKED); 4446 4447 if (refcount_release(&prr->prr_refcount)) { 4448 racct_destroy(&prr->prr_racct); 4449 LIST_REMOVE(prr, prr_next); 4450 free(prr, M_PRISON_RACCT); 4451 } 4452 } 4453 4454 void 4455 prison_racct_free(struct prison_racct *prr) 4456 { 4457 int old; 4458 4459 sx_assert(&allprison_lock, SA_UNLOCKED); 4460 4461 old = prr->prr_refcount; 4462 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4463 return; 4464 4465 sx_xlock(&allprison_lock); 4466 prison_racct_free_locked(prr); 4467 sx_xunlock(&allprison_lock); 4468 } 4469 4470 #ifdef RACCT 4471 static void 4472 prison_racct_attach(struct prison *pr) 4473 { 4474 struct prison_racct *prr; 4475 4476 sx_assert(&allprison_lock, SA_XLOCKED); 4477 4478 prr = prison_racct_find_locked(pr->pr_name); 4479 KASSERT(prr != NULL, ("cannot find prison_racct")); 4480 4481 pr->pr_prison_racct = prr; 4482 } 4483 4484 /* 4485 * Handle jail renaming. From the racct point of view, renaming means 4486 * moving from one prison_racct to another. 4487 */ 4488 static void 4489 prison_racct_modify(struct prison *pr) 4490 { 4491 struct proc *p; 4492 struct ucred *cred; 4493 struct prison_racct *oldprr; 4494 4495 sx_slock(&allproc_lock); 4496 sx_xlock(&allprison_lock); 4497 4498 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4499 sx_xunlock(&allprison_lock); 4500 sx_sunlock(&allproc_lock); 4501 return; 4502 } 4503 4504 oldprr = pr->pr_prison_racct; 4505 pr->pr_prison_racct = NULL; 4506 4507 prison_racct_attach(pr); 4508 4509 /* 4510 * Move resource utilisation records. 4511 */ 4512 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4513 4514 /* 4515 * Force rctl to reattach rules to processes. 4516 */ 4517 FOREACH_PROC_IN_SYSTEM(p) { 4518 PROC_LOCK(p); 4519 cred = crhold(p->p_ucred); 4520 PROC_UNLOCK(p); 4521 racct_proc_ucred_changed(p, cred, cred); 4522 crfree(cred); 4523 } 4524 4525 sx_sunlock(&allproc_lock); 4526 prison_racct_free_locked(oldprr); 4527 sx_xunlock(&allprison_lock); 4528 } 4529 4530 static void 4531 prison_racct_detach(struct prison *pr) 4532 { 4533 4534 sx_assert(&allprison_lock, SA_UNLOCKED); 4535 4536 prison_racct_free(pr->pr_prison_racct); 4537 pr->pr_prison_racct = NULL; 4538 } 4539 #endif /* RACCT */ 4540 4541 #ifdef DDB 4542 4543 static void 4544 db_show_prison(struct prison *pr) 4545 { 4546 int fi; 4547 #if defined(INET) || defined(INET6) 4548 int ii; 4549 #endif 4550 unsigned jsf; 4551 #ifdef INET6 4552 char ip6buf[INET6_ADDRSTRLEN]; 4553 #endif 4554 4555 db_printf("prison %p:\n", pr); 4556 db_printf(" jid = %d\n", pr->pr_id); 4557 db_printf(" name = %s\n", pr->pr_name); 4558 db_printf(" parent = %p\n", pr->pr_parent); 4559 db_printf(" ref = %d\n", pr->pr_ref); 4560 db_printf(" uref = %d\n", pr->pr_uref); 4561 db_printf(" path = %s\n", pr->pr_path); 4562 db_printf(" cpuset = %d\n", pr->pr_cpuset 4563 ? pr->pr_cpuset->cs_id : -1); 4564 #ifdef VIMAGE 4565 db_printf(" vnet = %p\n", pr->pr_vnet); 4566 #endif 4567 db_printf(" root = %p\n", pr->pr_root); 4568 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4569 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4570 db_printf(" children.max = %d\n", pr->pr_childmax); 4571 db_printf(" children.cur = %d\n", pr->pr_childcount); 4572 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4573 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4574 db_printf(" flags = 0x%x", pr->pr_flags); 4575 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4576 fi++) 4577 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4578 db_printf(" %s", pr_flag_names[fi]); 4579 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4580 fi++) { 4581 jsf = pr->pr_flags & 4582 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4583 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4584 pr_flag_jailsys[fi].disable && 4585 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4586 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4587 : "inherit"); 4588 } 4589 db_printf(" allow = 0x%x", pr->pr_allow); 4590 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4591 fi++) 4592 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4593 db_printf(" %s", pr_allow_names[fi]); 4594 db_printf("\n"); 4595 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4596 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4597 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4598 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4599 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4600 #ifdef INET 4601 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4602 for (ii = 0; ii < pr->pr_ip4s; ii++) 4603 db_printf(" %s %s\n", 4604 ii == 0 ? "ip4.addr =" : " ", 4605 inet_ntoa(pr->pr_ip4[ii])); 4606 #endif 4607 #ifdef INET6 4608 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4609 for (ii = 0; ii < pr->pr_ip6s; ii++) 4610 db_printf(" %s %s\n", 4611 ii == 0 ? "ip6.addr =" : " ", 4612 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4613 #endif 4614 } 4615 4616 DB_SHOW_COMMAND(prison, db_show_prison_command) 4617 { 4618 struct prison *pr; 4619 4620 if (!have_addr) { 4621 /* 4622 * Show all prisons in the list, and prison0 which is not 4623 * listed. 4624 */ 4625 db_show_prison(&prison0); 4626 if (!db_pager_quit) { 4627 TAILQ_FOREACH(pr, &allprison, pr_list) { 4628 db_show_prison(pr); 4629 if (db_pager_quit) 4630 break; 4631 } 4632 } 4633 return; 4634 } 4635 4636 if (addr == 0) 4637 pr = &prison0; 4638 else { 4639 /* Look for a prison with the ID and with references. */ 4640 TAILQ_FOREACH(pr, &allprison, pr_list) 4641 if (pr->pr_id == addr && pr->pr_ref > 0) 4642 break; 4643 if (pr == NULL) 4644 /* Look again, without requiring a reference. */ 4645 TAILQ_FOREACH(pr, &allprison, pr_list) 4646 if (pr->pr_id == addr) 4647 break; 4648 if (pr == NULL) 4649 /* Assume address points to a valid prison. */ 4650 pr = (struct prison *)addr; 4651 } 4652 db_show_prison(pr); 4653 } 4654 4655 #endif /* DDB */
Cache object: 6ea746a8277d8b5e49050b3e2bdafc4c
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