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("$FreeBSD$"); 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 static 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 = "0", 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; 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, UIO_SYSSPACE, 925 path, td); 926 error = namei(&nd); 927 if (error) 928 goto done_free; 929 root = nd.ni_vp; 930 NDFREE(&nd, NDF_ONLY_PNBUF); 931 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 932 strlcpy(g_path, path, MAXPATHLEN); 933 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 934 if (error == 0) 935 path = g_path; 936 else if (error == ENODEV) { 937 /* proceed if sysctl debug.disablefullpath == 1 */ 938 fullpath_disabled = 1; 939 if (len < 2 || (len == 2 && path[0] == '/')) 940 path = NULL; 941 } else { 942 /* exit on other errors */ 943 goto done_free; 944 } 945 if (root->v_type != VDIR) { 946 error = ENOTDIR; 947 vput(root); 948 goto done_free; 949 } 950 VOP_UNLOCK(root, 0); 951 if (fullpath_disabled) { 952 /* Leave room for a real-root full pathname. */ 953 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 954 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 955 error = ENAMETOOLONG; 956 goto done_free; 957 } 958 } 959 } 960 961 /* 962 * Grab the allprison lock before letting modules check their 963 * parameters. Once we have it, do not let go so we'll have a 964 * consistent view of the OSD list. 965 */ 966 sx_xlock(&allprison_lock); 967 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts); 968 if (error) 969 goto done_unlock_list; 970 971 /* By now, all parameters should have been noted. */ 972 TAILQ_FOREACH(opt, opts, link) { 973 if (!opt->seen && strcmp(opt->name, "errmsg")) { 974 error = EINVAL; 975 vfs_opterror(opts, "unknown parameter: %s", opt->name); 976 goto done_unlock_list; 977 } 978 } 979 980 /* 981 * See if we are creating a new record or updating an existing one. 982 * This abuses the file error codes ENOENT and EEXIST. 983 */ 984 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 985 if (!cuflags) { 986 error = EINVAL; 987 vfs_opterror(opts, "no valid operation (create or update)"); 988 goto done_unlock_list; 989 } 990 pr = NULL; 991 namelc = NULL; 992 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 993 namelc = strrchr(name, '.'); 994 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 995 if (*p != '\0') 996 jid = 0; 997 } 998 if (jid != 0) { 999 /* 1000 * See if a requested jid already exists. There is an 1001 * information leak here if the jid exists but is not within 1002 * the caller's jail hierarchy. Jail creators will get EEXIST 1003 * even though they cannot see the jail, and CREATE | UPDATE 1004 * will return ENOENT which is not normally a valid error. 1005 */ 1006 if (jid < 0) { 1007 error = EINVAL; 1008 vfs_opterror(opts, "negative jid"); 1009 goto done_unlock_list; 1010 } 1011 pr = prison_find(jid); 1012 if (pr != NULL) { 1013 ppr = pr->pr_parent; 1014 /* Create: jid must not exist. */ 1015 if (cuflags == JAIL_CREATE) { 1016 mtx_unlock(&pr->pr_mtx); 1017 error = EEXIST; 1018 vfs_opterror(opts, "jail %d already exists", 1019 jid); 1020 goto done_unlock_list; 1021 } 1022 if (!prison_ischild(mypr, pr)) { 1023 mtx_unlock(&pr->pr_mtx); 1024 pr = NULL; 1025 } else if (pr->pr_uref == 0) { 1026 if (!(flags & JAIL_DYING)) { 1027 mtx_unlock(&pr->pr_mtx); 1028 error = ENOENT; 1029 vfs_opterror(opts, "jail %d is dying", 1030 jid); 1031 goto done_unlock_list; 1032 } else if ((flags & JAIL_ATTACH) || 1033 (pr_flags & PR_PERSIST)) { 1034 /* 1035 * A dying jail might be resurrected 1036 * (via attach or persist), but first 1037 * it must determine if another jail 1038 * has claimed its name. Accomplish 1039 * this by implicitly re-setting the 1040 * name. 1041 */ 1042 if (name == NULL) 1043 name = prison_name(mypr, pr); 1044 } 1045 } 1046 } 1047 if (pr == NULL) { 1048 /* Update: jid must exist. */ 1049 if (cuflags == JAIL_UPDATE) { 1050 error = ENOENT; 1051 vfs_opterror(opts, "jail %d not found", jid); 1052 goto done_unlock_list; 1053 } 1054 } 1055 } 1056 /* 1057 * If the caller provided a name, look for a jail by that name. 1058 * This has different semantics for creates and updates keyed by jid 1059 * (where the name must not already exist in a different jail), 1060 * and updates keyed by the name itself (where the name must exist 1061 * because that is the jail being updated). 1062 */ 1063 if (name != NULL) { 1064 namelc = strrchr(name, '.'); 1065 if (namelc == NULL) 1066 namelc = name; 1067 else { 1068 /* 1069 * This is a hierarchical name. Split it into the 1070 * parent and child names, and make sure the parent 1071 * exists or matches an already found jail. 1072 */ 1073 *namelc = '\0'; 1074 if (pr != NULL) { 1075 if (strncmp(name, ppr->pr_name, namelc - name) 1076 || ppr->pr_name[namelc - name] != '\0') { 1077 mtx_unlock(&pr->pr_mtx); 1078 error = EINVAL; 1079 vfs_opterror(opts, 1080 "cannot change jail's parent"); 1081 goto done_unlock_list; 1082 } 1083 } else { 1084 ppr = prison_find_name(mypr, name); 1085 if (ppr == NULL) { 1086 error = ENOENT; 1087 vfs_opterror(opts, 1088 "jail \"%s\" not found", name); 1089 goto done_unlock_list; 1090 } 1091 mtx_unlock(&ppr->pr_mtx); 1092 } 1093 name = ++namelc; 1094 } 1095 if (name[0] != '\0') { 1096 namelen = 1097 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1098 name_again: 1099 deadpr = NULL; 1100 FOREACH_PRISON_CHILD(ppr, tpr) { 1101 if (tpr != pr && tpr->pr_ref > 0 && 1102 !strcmp(tpr->pr_name + namelen, name)) { 1103 if (pr == NULL && 1104 cuflags != JAIL_CREATE) { 1105 mtx_lock(&tpr->pr_mtx); 1106 if (tpr->pr_ref > 0) { 1107 /* 1108 * Use this jail 1109 * for updates. 1110 */ 1111 if (tpr->pr_uref > 0) { 1112 pr = tpr; 1113 break; 1114 } 1115 deadpr = tpr; 1116 } 1117 mtx_unlock(&tpr->pr_mtx); 1118 } else if (tpr->pr_uref > 0) { 1119 /* 1120 * Create, or update(jid): 1121 * name must not exist in an 1122 * active sibling jail. 1123 */ 1124 error = EEXIST; 1125 if (pr != NULL) 1126 mtx_unlock(&pr->pr_mtx); 1127 vfs_opterror(opts, 1128 "jail \"%s\" already exists", 1129 name); 1130 goto done_unlock_list; 1131 } 1132 } 1133 } 1134 /* If no active jail is found, use a dying one. */ 1135 if (deadpr != NULL && pr == NULL) { 1136 if (flags & JAIL_DYING) { 1137 mtx_lock(&deadpr->pr_mtx); 1138 if (deadpr->pr_ref == 0) { 1139 mtx_unlock(&deadpr->pr_mtx); 1140 goto name_again; 1141 } 1142 pr = deadpr; 1143 } else if (cuflags == JAIL_UPDATE) { 1144 error = ENOENT; 1145 vfs_opterror(opts, 1146 "jail \"%s\" is dying", name); 1147 goto done_unlock_list; 1148 } 1149 } 1150 /* Update: name must exist if no jid. */ 1151 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1152 error = ENOENT; 1153 vfs_opterror(opts, "jail \"%s\" not found", 1154 name); 1155 goto done_unlock_list; 1156 } 1157 } 1158 } 1159 /* Update: must provide a jid or name. */ 1160 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1161 error = ENOENT; 1162 vfs_opterror(opts, "update specified no jail"); 1163 goto done_unlock_list; 1164 } 1165 1166 /* If there's no prison to update, create a new one and link it in. */ 1167 if (pr == NULL) { 1168 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1169 if (tpr->pr_childcount >= tpr->pr_childmax) { 1170 error = EPERM; 1171 vfs_opterror(opts, "prison limit exceeded"); 1172 goto done_unlock_list; 1173 } 1174 created = 1; 1175 mtx_lock(&ppr->pr_mtx); 1176 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) { 1177 mtx_unlock(&ppr->pr_mtx); 1178 error = ENOENT; 1179 vfs_opterror(opts, "parent jail went away!"); 1180 goto done_unlock_list; 1181 } 1182 ppr->pr_ref++; 1183 ppr->pr_uref++; 1184 mtx_unlock(&ppr->pr_mtx); 1185 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1186 if (jid == 0) { 1187 /* Find the next free jid. */ 1188 jid = lastprid + 1; 1189 findnext: 1190 if (jid == JAIL_MAX) 1191 jid = 1; 1192 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1193 if (tpr->pr_id < jid) 1194 continue; 1195 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1196 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1197 break; 1198 } 1199 if (jid == lastprid) { 1200 error = EAGAIN; 1201 vfs_opterror(opts, 1202 "no available jail IDs"); 1203 free(pr, M_PRISON); 1204 prison_deref(ppr, PD_DEREF | 1205 PD_DEUREF | PD_LIST_XLOCKED); 1206 goto done_releroot; 1207 } 1208 jid++; 1209 goto findnext; 1210 } 1211 lastprid = jid; 1212 } else { 1213 /* 1214 * The jail already has a jid (that did not yet exist), 1215 * so just find where to insert it. 1216 */ 1217 TAILQ_FOREACH(tpr, &allprison, pr_list) 1218 if (tpr->pr_id >= jid) { 1219 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1220 break; 1221 } 1222 } 1223 if (tpr == NULL) 1224 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1225 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1226 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1227 tpr->pr_childcount++; 1228 1229 pr->pr_parent = ppr; 1230 pr->pr_id = jid; 1231 1232 /* Set some default values, and inherit some from the parent. */ 1233 if (name == NULL) 1234 name = ""; 1235 if (path == NULL) { 1236 path = "/"; 1237 root = mypr->pr_root; 1238 vref(root); 1239 } 1240 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1241 pr->pr_flags |= PR_HOST; 1242 #if defined(INET) || defined(INET6) 1243 #ifdef VIMAGE 1244 if (!(pr_flags & PR_VNET)) 1245 #endif 1246 { 1247 #ifdef INET 1248 if (!(ch_flags & PR_IP4_USER)) 1249 pr->pr_flags |= 1250 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE; 1251 else if (!(pr_flags & PR_IP4_USER)) { 1252 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1253 if (ppr->pr_ip4 != NULL) { 1254 pr->pr_ip4s = ppr->pr_ip4s; 1255 pr->pr_ip4 = malloc(pr->pr_ip4s * 1256 sizeof(struct in_addr), M_PRISON, 1257 M_WAITOK); 1258 bcopy(ppr->pr_ip4, pr->pr_ip4, 1259 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1260 } 1261 } 1262 #endif 1263 #ifdef INET6 1264 if (!(ch_flags & PR_IP6_USER)) 1265 pr->pr_flags |= 1266 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE; 1267 else if (!(pr_flags & PR_IP6_USER)) { 1268 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1269 if (ppr->pr_ip6 != NULL) { 1270 pr->pr_ip6s = ppr->pr_ip6s; 1271 pr->pr_ip6 = malloc(pr->pr_ip6s * 1272 sizeof(struct in6_addr), M_PRISON, 1273 M_WAITOK); 1274 bcopy(ppr->pr_ip6, pr->pr_ip6, 1275 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1276 } 1277 } 1278 #endif 1279 } 1280 #endif 1281 /* Source address selection is always on by default. */ 1282 pr->pr_flags |= _PR_IP_SADDRSEL; 1283 1284 pr->pr_securelevel = ppr->pr_securelevel; 1285 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1286 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 1287 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1288 1289 LIST_INIT(&pr->pr_children); 1290 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1291 1292 #ifdef VIMAGE 1293 /* Allocate a new vnet if specified. */ 1294 pr->pr_vnet = (pr_flags & PR_VNET) 1295 ? vnet_alloc() : ppr->pr_vnet; 1296 #endif 1297 /* 1298 * Allocate a dedicated cpuset for each jail. 1299 * Unlike other initial settings, this may return an erorr. 1300 */ 1301 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1302 if (error) { 1303 prison_deref(pr, PD_LIST_XLOCKED); 1304 goto done_releroot; 1305 } 1306 1307 mtx_lock(&pr->pr_mtx); 1308 /* 1309 * New prisons do not yet have a reference, because we do not 1310 * want other to see the incomplete prison once the 1311 * allprison_lock is downgraded. 1312 */ 1313 } else { 1314 created = 0; 1315 /* 1316 * Grab a reference for existing prisons, to ensure they 1317 * continue to exist for the duration of the call. 1318 */ 1319 pr->pr_ref++; 1320 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1321 if ((pr->pr_flags & PR_VNET) && 1322 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1323 error = EINVAL; 1324 vfs_opterror(opts, 1325 "vnet jails cannot have IP address restrictions"); 1326 goto done_deref_locked; 1327 } 1328 #endif 1329 #ifdef INET 1330 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1331 error = EINVAL; 1332 vfs_opterror(opts, 1333 "ip4 cannot be changed after creation"); 1334 goto done_deref_locked; 1335 } 1336 #endif 1337 #ifdef INET6 1338 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1339 error = EINVAL; 1340 vfs_opterror(opts, 1341 "ip6 cannot be changed after creation"); 1342 goto done_deref_locked; 1343 } 1344 #endif 1345 } 1346 1347 /* Do final error checking before setting anything. */ 1348 if (gotslevel) { 1349 if (slevel < ppr->pr_securelevel) { 1350 error = EPERM; 1351 goto done_deref_locked; 1352 } 1353 } 1354 if (gotchildmax) { 1355 if (childmax >= ppr->pr_childmax) { 1356 error = EPERM; 1357 goto done_deref_locked; 1358 } 1359 } 1360 if (gotenforce) { 1361 if (enforce < ppr->pr_enforce_statfs) { 1362 error = EPERM; 1363 goto done_deref_locked; 1364 } 1365 } 1366 if (gotrsnum) { 1367 /* 1368 * devfs_rsnum is a uint16_t 1369 */ 1370 if (rsnum < 0 || rsnum > 65535) { 1371 error = EINVAL; 1372 goto done_deref_locked; 1373 } 1374 /* 1375 * Nested jails always inherit parent's devfs ruleset 1376 */ 1377 if (jailed(td->td_ucred)) { 1378 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1379 error = EPERM; 1380 goto done_deref_locked; 1381 } else 1382 rsnum = ppr->pr_devfs_rsnum; 1383 } 1384 } 1385 #ifdef INET 1386 if (ip4s > 0) { 1387 if (ppr->pr_flags & PR_IP4) { 1388 /* 1389 * Make sure the new set of IP addresses is a 1390 * subset of the parent's list. Don't worry 1391 * about the parent being unlocked, as any 1392 * setting is done with allprison_lock held. 1393 */ 1394 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1395 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1396 break; 1397 if (ij == ppr->pr_ip4s) { 1398 error = EPERM; 1399 goto done_deref_locked; 1400 } 1401 if (ip4s > 1) { 1402 for (ii = ij = 1; ii < ip4s; ii++) { 1403 if (ip4[ii].s_addr == 1404 ppr->pr_ip4[0].s_addr) 1405 continue; 1406 for (; ij < ppr->pr_ip4s; ij++) 1407 if (ip4[ii].s_addr == 1408 ppr->pr_ip4[ij].s_addr) 1409 break; 1410 if (ij == ppr->pr_ip4s) 1411 break; 1412 } 1413 if (ij == ppr->pr_ip4s) { 1414 error = EPERM; 1415 goto done_deref_locked; 1416 } 1417 } 1418 } 1419 /* 1420 * Check for conflicting IP addresses. We permit them 1421 * if there is no more than one IP on each jail. If 1422 * there is a duplicate on a jail with more than one 1423 * IP stop checking and return error. 1424 */ 1425 tppr = ppr; 1426 #ifdef VIMAGE 1427 for (; tppr != &prison0; tppr = tppr->pr_parent) 1428 if (tppr->pr_flags & PR_VNET) 1429 break; 1430 #endif 1431 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1432 if (tpr == pr || 1433 #ifdef VIMAGE 1434 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1435 #endif 1436 tpr->pr_uref == 0) { 1437 descend = 0; 1438 continue; 1439 } 1440 if (!(tpr->pr_flags & PR_IP4_USER)) 1441 continue; 1442 descend = 0; 1443 if (tpr->pr_ip4 == NULL || 1444 (ip4s == 1 && tpr->pr_ip4s == 1)) 1445 continue; 1446 for (ii = 0; ii < ip4s; ii++) { 1447 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1448 error = EADDRINUSE; 1449 vfs_opterror(opts, 1450 "IPv4 addresses clash"); 1451 goto done_deref_locked; 1452 } 1453 } 1454 } 1455 } 1456 #endif 1457 #ifdef INET6 1458 if (ip6s > 0) { 1459 if (ppr->pr_flags & PR_IP6) { 1460 /* 1461 * Make sure the new set of IP addresses is a 1462 * subset of the parent's list. 1463 */ 1464 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1465 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1466 &ppr->pr_ip6[ij])) 1467 break; 1468 if (ij == ppr->pr_ip6s) { 1469 error = EPERM; 1470 goto done_deref_locked; 1471 } 1472 if (ip6s > 1) { 1473 for (ii = ij = 1; ii < ip6s; ii++) { 1474 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1475 &ppr->pr_ip6[0])) 1476 continue; 1477 for (; ij < ppr->pr_ip6s; ij++) 1478 if (IN6_ARE_ADDR_EQUAL( 1479 &ip6[ii], &ppr->pr_ip6[ij])) 1480 break; 1481 if (ij == ppr->pr_ip6s) 1482 break; 1483 } 1484 if (ij == ppr->pr_ip6s) { 1485 error = EPERM; 1486 goto done_deref_locked; 1487 } 1488 } 1489 } 1490 /* Check for conflicting IP addresses. */ 1491 tppr = ppr; 1492 #ifdef VIMAGE 1493 for (; tppr != &prison0; tppr = tppr->pr_parent) 1494 if (tppr->pr_flags & PR_VNET) 1495 break; 1496 #endif 1497 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1498 if (tpr == pr || 1499 #ifdef VIMAGE 1500 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1501 #endif 1502 tpr->pr_uref == 0) { 1503 descend = 0; 1504 continue; 1505 } 1506 if (!(tpr->pr_flags & PR_IP6_USER)) 1507 continue; 1508 descend = 0; 1509 if (tpr->pr_ip6 == NULL || 1510 (ip6s == 1 && tpr->pr_ip6s == 1)) 1511 continue; 1512 for (ii = 0; ii < ip6s; ii++) { 1513 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1514 error = EADDRINUSE; 1515 vfs_opterror(opts, 1516 "IPv6 addresses clash"); 1517 goto done_deref_locked; 1518 } 1519 } 1520 } 1521 } 1522 #endif 1523 onamelen = namelen = 0; 1524 if (name != NULL) { 1525 /* Give a default name of the jid. */ 1526 if (name[0] == '\0') 1527 snprintf(name = numbuf, sizeof(numbuf), "%d", jid); 1528 else if (*namelc == '0' || (strtoul(namelc, &p, 10) != jid && 1529 *p == '\0')) { 1530 error = EINVAL; 1531 vfs_opterror(opts, 1532 "name cannot be numeric (unless it is the jid)"); 1533 goto done_deref_locked; 1534 } 1535 /* 1536 * Make sure the name isn't too long for the prison or its 1537 * children. 1538 */ 1539 onamelen = strlen(pr->pr_name); 1540 namelen = strlen(name); 1541 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) { 1542 error = ENAMETOOLONG; 1543 goto done_deref_locked; 1544 } 1545 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1546 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1547 sizeof(pr->pr_name)) { 1548 error = ENAMETOOLONG; 1549 goto done_deref_locked; 1550 } 1551 } 1552 } 1553 if (pr_allow & ~ppr->pr_allow) { 1554 error = EPERM; 1555 goto done_deref_locked; 1556 } 1557 1558 /* Set the parameters of the prison. */ 1559 #ifdef INET 1560 redo_ip4 = 0; 1561 if (pr_flags & PR_IP4_USER) { 1562 pr->pr_flags |= PR_IP4; 1563 free(pr->pr_ip4, M_PRISON); 1564 pr->pr_ip4s = ip4s; 1565 pr->pr_ip4 = ip4; 1566 ip4 = NULL; 1567 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1568 #ifdef VIMAGE 1569 if (tpr->pr_flags & PR_VNET) { 1570 descend = 0; 1571 continue; 1572 } 1573 #endif 1574 if (prison_restrict_ip4(tpr, NULL)) { 1575 redo_ip4 = 1; 1576 descend = 0; 1577 } 1578 } 1579 } 1580 #endif 1581 #ifdef INET6 1582 redo_ip6 = 0; 1583 if (pr_flags & PR_IP6_USER) { 1584 pr->pr_flags |= PR_IP6; 1585 free(pr->pr_ip6, M_PRISON); 1586 pr->pr_ip6s = ip6s; 1587 pr->pr_ip6 = ip6; 1588 ip6 = NULL; 1589 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1590 #ifdef VIMAGE 1591 if (tpr->pr_flags & PR_VNET) { 1592 descend = 0; 1593 continue; 1594 } 1595 #endif 1596 if (prison_restrict_ip6(tpr, NULL)) { 1597 redo_ip6 = 1; 1598 descend = 0; 1599 } 1600 } 1601 } 1602 #endif 1603 if (gotslevel) { 1604 pr->pr_securelevel = slevel; 1605 /* Set all child jails to be at least this level. */ 1606 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1607 if (tpr->pr_securelevel < slevel) 1608 tpr->pr_securelevel = slevel; 1609 } 1610 if (gotchildmax) { 1611 pr->pr_childmax = childmax; 1612 /* Set all child jails to under this limit. */ 1613 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1614 if (tpr->pr_childmax > childmax - level) 1615 tpr->pr_childmax = childmax > level 1616 ? childmax - level : 0; 1617 } 1618 if (gotenforce) { 1619 pr->pr_enforce_statfs = enforce; 1620 /* Pass this restriction on to the children. */ 1621 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1622 if (tpr->pr_enforce_statfs < enforce) 1623 tpr->pr_enforce_statfs = enforce; 1624 } 1625 if (gotrsnum) { 1626 pr->pr_devfs_rsnum = rsnum; 1627 /* Pass this restriction on to the children. */ 1628 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1629 tpr->pr_devfs_rsnum = rsnum; 1630 } 1631 if (name != NULL) { 1632 if (ppr == &prison0) 1633 strlcpy(pr->pr_name, name, sizeof(pr->pr_name)); 1634 else 1635 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1636 ppr->pr_name, name); 1637 /* Change this component of child names. */ 1638 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1639 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1640 strlen(tpr->pr_name + onamelen) + 1); 1641 bcopy(pr->pr_name, tpr->pr_name, namelen); 1642 } 1643 } 1644 if (path != NULL) { 1645 /* Try to keep a real-rooted full pathname. */ 1646 if (fullpath_disabled && path[0] == '/' && 1647 strcmp(mypr->pr_path, "/")) 1648 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1649 mypr->pr_path, path); 1650 else 1651 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1652 pr->pr_root = root; 1653 } 1654 if (PR_HOST & ch_flags & ~pr_flags) { 1655 if (pr->pr_flags & PR_HOST) { 1656 /* 1657 * Copy the parent's host info. As with pr_ip4 above, 1658 * the lack of a lock on the parent is not a problem; 1659 * it is always set with allprison_lock at least 1660 * shared, and is held exclusively here. 1661 */ 1662 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1663 sizeof(pr->pr_hostname)); 1664 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1665 sizeof(pr->pr_domainname)); 1666 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1667 sizeof(pr->pr_hostuuid)); 1668 pr->pr_hostid = pr->pr_parent->pr_hostid; 1669 } 1670 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1671 /* Set this prison, and any descendants without PR_HOST. */ 1672 if (host != NULL) 1673 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1674 if (domain != NULL) 1675 strlcpy(pr->pr_domainname, domain, 1676 sizeof(pr->pr_domainname)); 1677 if (uuid != NULL) 1678 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1679 if (gothid) 1680 pr->pr_hostid = hid; 1681 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1682 if (tpr->pr_flags & PR_HOST) 1683 descend = 0; 1684 else { 1685 if (host != NULL) 1686 strlcpy(tpr->pr_hostname, 1687 pr->pr_hostname, 1688 sizeof(tpr->pr_hostname)); 1689 if (domain != NULL) 1690 strlcpy(tpr->pr_domainname, 1691 pr->pr_domainname, 1692 sizeof(tpr->pr_domainname)); 1693 if (uuid != NULL) 1694 strlcpy(tpr->pr_hostuuid, 1695 pr->pr_hostuuid, 1696 sizeof(tpr->pr_hostuuid)); 1697 if (gothid) 1698 tpr->pr_hostid = hid; 1699 } 1700 } 1701 } 1702 if ((tallow = ch_allow & ~pr_allow)) { 1703 /* Clear allow bits in all children. */ 1704 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1705 tpr->pr_allow &= ~tallow; 1706 } 1707 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1708 /* 1709 * Persistent prisons get an extra reference, and prisons losing their 1710 * persist flag lose that reference. Only do this for existing prisons 1711 * for now, so new ones will remain unseen until after the module 1712 * handlers have completed. 1713 */ 1714 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1715 if (pr_flags & PR_PERSIST) { 1716 pr->pr_ref++; 1717 pr->pr_uref++; 1718 } else { 1719 pr->pr_ref--; 1720 pr->pr_uref--; 1721 } 1722 } 1723 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1724 mtx_unlock(&pr->pr_mtx); 1725 1726 #ifdef RACCT 1727 if (created) 1728 prison_racct_attach(pr); 1729 #endif 1730 1731 /* Locks may have prevented a complete restriction of child IP 1732 * addresses. If so, allocate some more memory and try again. 1733 */ 1734 #ifdef INET 1735 while (redo_ip4) { 1736 ip4s = pr->pr_ip4s; 1737 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1738 mtx_lock(&pr->pr_mtx); 1739 redo_ip4 = 0; 1740 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1741 #ifdef VIMAGE 1742 if (tpr->pr_flags & PR_VNET) { 1743 descend = 0; 1744 continue; 1745 } 1746 #endif 1747 if (prison_restrict_ip4(tpr, ip4)) { 1748 if (ip4 != NULL) 1749 ip4 = NULL; 1750 else 1751 redo_ip4 = 1; 1752 } 1753 } 1754 mtx_unlock(&pr->pr_mtx); 1755 } 1756 #endif 1757 #ifdef INET6 1758 while (redo_ip6) { 1759 ip6s = pr->pr_ip6s; 1760 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1761 mtx_lock(&pr->pr_mtx); 1762 redo_ip6 = 0; 1763 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1764 #ifdef VIMAGE 1765 if (tpr->pr_flags & PR_VNET) { 1766 descend = 0; 1767 continue; 1768 } 1769 #endif 1770 if (prison_restrict_ip6(tpr, ip6)) { 1771 if (ip6 != NULL) 1772 ip6 = NULL; 1773 else 1774 redo_ip6 = 1; 1775 } 1776 } 1777 mtx_unlock(&pr->pr_mtx); 1778 } 1779 #endif 1780 1781 /* Let the modules do their work. */ 1782 sx_downgrade(&allprison_lock); 1783 if (created) { 1784 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1785 if (error) { 1786 prison_deref(pr, PD_LIST_SLOCKED); 1787 goto done_errmsg; 1788 } 1789 } 1790 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1791 if (error) { 1792 prison_deref(pr, created 1793 ? PD_LIST_SLOCKED 1794 : PD_DEREF | PD_LIST_SLOCKED); 1795 goto done_errmsg; 1796 } 1797 1798 /* Attach this process to the prison if requested. */ 1799 if (flags & JAIL_ATTACH) { 1800 mtx_lock(&pr->pr_mtx); 1801 error = do_jail_attach(td, pr); 1802 if (error) { 1803 vfs_opterror(opts, "attach failed"); 1804 if (!created) 1805 prison_deref(pr, PD_DEREF); 1806 goto done_errmsg; 1807 } 1808 } 1809 1810 #ifdef RACCT 1811 if (!created) { 1812 sx_sunlock(&allprison_lock); 1813 prison_racct_modify(pr); 1814 sx_slock(&allprison_lock); 1815 } 1816 #endif 1817 1818 td->td_retval[0] = pr->pr_id; 1819 1820 /* 1821 * Now that it is all there, drop the temporary reference from existing 1822 * prisons. Or add a reference to newly created persistent prisons 1823 * (which was not done earlier so that the prison would not be publicly 1824 * visible). 1825 */ 1826 if (!created) { 1827 prison_deref(pr, (flags & JAIL_ATTACH) 1828 ? PD_DEREF 1829 : PD_DEREF | PD_LIST_SLOCKED); 1830 } else { 1831 if (pr_flags & PR_PERSIST) { 1832 mtx_lock(&pr->pr_mtx); 1833 pr->pr_ref++; 1834 pr->pr_uref++; 1835 mtx_unlock(&pr->pr_mtx); 1836 } 1837 if (!(flags & JAIL_ATTACH)) 1838 sx_sunlock(&allprison_lock); 1839 } 1840 1841 goto done_errmsg; 1842 1843 done_deref_locked: 1844 prison_deref(pr, created 1845 ? PD_LOCKED | PD_LIST_XLOCKED 1846 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1847 goto done_releroot; 1848 done_unlock_list: 1849 sx_xunlock(&allprison_lock); 1850 done_releroot: 1851 if (root != NULL) 1852 vrele(root); 1853 done_errmsg: 1854 if (error) { 1855 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1856 if (errmsg_len > 0) { 1857 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1858 if (errmsg_pos > 0) { 1859 if (optuio->uio_segflg == UIO_SYSSPACE) 1860 bcopy(errmsg, 1861 optuio->uio_iov[errmsg_pos].iov_base, 1862 errmsg_len); 1863 else 1864 copyout(errmsg, 1865 optuio->uio_iov[errmsg_pos].iov_base, 1866 errmsg_len); 1867 } 1868 } 1869 } 1870 done_free: 1871 #ifdef INET 1872 free(ip4, M_PRISON); 1873 #endif 1874 #ifdef INET6 1875 free(ip6, M_PRISON); 1876 #endif 1877 if (g_path != NULL) 1878 free(g_path, M_TEMP); 1879 vfs_freeopts(opts); 1880 return (error); 1881 } 1882 1883 1884 /* 1885 * struct jail_get_args { 1886 * struct iovec *iovp; 1887 * unsigned int iovcnt; 1888 * int flags; 1889 * }; 1890 */ 1891 int 1892 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1893 { 1894 struct uio *auio; 1895 int error; 1896 1897 /* Check that we have an even number of iovecs. */ 1898 if (uap->iovcnt & 1) 1899 return (EINVAL); 1900 1901 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1902 if (error) 1903 return (error); 1904 error = kern_jail_get(td, auio, uap->flags); 1905 if (error == 0) 1906 error = copyout(auio->uio_iov, uap->iovp, 1907 uap->iovcnt * sizeof (struct iovec)); 1908 free(auio, M_IOV); 1909 return (error); 1910 } 1911 1912 int 1913 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1914 { 1915 struct prison *pr, *mypr; 1916 struct vfsopt *opt; 1917 struct vfsoptlist *opts; 1918 char *errmsg, *name; 1919 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1920 1921 if (flags & ~JAIL_GET_MASK) 1922 return (EINVAL); 1923 1924 /* Get the parameter list. */ 1925 error = vfs_buildopts(optuio, &opts); 1926 if (error) 1927 return (error); 1928 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1929 mypr = td->td_ucred->cr_prison; 1930 1931 /* 1932 * Find the prison specified by one of: lastjid, jid, name. 1933 */ 1934 sx_slock(&allprison_lock); 1935 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1936 if (error == 0) { 1937 TAILQ_FOREACH(pr, &allprison, pr_list) { 1938 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1939 mtx_lock(&pr->pr_mtx); 1940 if (pr->pr_ref > 0 && 1941 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1942 break; 1943 mtx_unlock(&pr->pr_mtx); 1944 } 1945 } 1946 if (pr != NULL) 1947 goto found_prison; 1948 error = ENOENT; 1949 vfs_opterror(opts, "no jail after %d", jid); 1950 goto done_unlock_list; 1951 } else if (error != ENOENT) 1952 goto done_unlock_list; 1953 1954 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1955 if (error == 0) { 1956 if (jid != 0) { 1957 pr = prison_find_child(mypr, jid); 1958 if (pr != NULL) { 1959 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1960 mtx_unlock(&pr->pr_mtx); 1961 error = ENOENT; 1962 vfs_opterror(opts, "jail %d is dying", 1963 jid); 1964 goto done_unlock_list; 1965 } 1966 goto found_prison; 1967 } 1968 error = ENOENT; 1969 vfs_opterror(opts, "jail %d not found", jid); 1970 goto done_unlock_list; 1971 } 1972 } else if (error != ENOENT) 1973 goto done_unlock_list; 1974 1975 error = vfs_getopt(opts, "name", (void **)&name, &len); 1976 if (error == 0) { 1977 if (len == 0 || name[len - 1] != '\0') { 1978 error = EINVAL; 1979 goto done_unlock_list; 1980 } 1981 pr = prison_find_name(mypr, name); 1982 if (pr != NULL) { 1983 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1984 mtx_unlock(&pr->pr_mtx); 1985 error = ENOENT; 1986 vfs_opterror(opts, "jail \"%s\" is dying", 1987 name); 1988 goto done_unlock_list; 1989 } 1990 goto found_prison; 1991 } 1992 error = ENOENT; 1993 vfs_opterror(opts, "jail \"%s\" not found", name); 1994 goto done_unlock_list; 1995 } else if (error != ENOENT) 1996 goto done_unlock_list; 1997 1998 vfs_opterror(opts, "no jail specified"); 1999 error = ENOENT; 2000 goto done_unlock_list; 2001 2002 found_prison: 2003 /* Get the parameters of the prison. */ 2004 pr->pr_ref++; 2005 locked = PD_LOCKED; 2006 td->td_retval[0] = pr->pr_id; 2007 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2008 if (error != 0 && error != ENOENT) 2009 goto done_deref; 2010 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2011 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2012 if (error != 0 && error != ENOENT) 2013 goto done_deref; 2014 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2015 if (error != 0 && error != ENOENT) 2016 goto done_deref; 2017 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2018 sizeof(pr->pr_cpuset->cs_id)); 2019 if (error != 0 && error != ENOENT) 2020 goto done_deref; 2021 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2022 if (error != 0 && error != ENOENT) 2023 goto done_deref; 2024 #ifdef INET 2025 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2026 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2027 if (error != 0 && error != ENOENT) 2028 goto done_deref; 2029 #endif 2030 #ifdef INET6 2031 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2032 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2033 if (error != 0 && error != ENOENT) 2034 goto done_deref; 2035 #endif 2036 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2037 sizeof(pr->pr_securelevel)); 2038 if (error != 0 && error != ENOENT) 2039 goto done_deref; 2040 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2041 sizeof(pr->pr_childcount)); 2042 if (error != 0 && error != ENOENT) 2043 goto done_deref; 2044 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2045 sizeof(pr->pr_childmax)); 2046 if (error != 0 && error != ENOENT) 2047 goto done_deref; 2048 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2049 if (error != 0 && error != ENOENT) 2050 goto done_deref; 2051 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2052 if (error != 0 && error != ENOENT) 2053 goto done_deref; 2054 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2055 if (error != 0 && error != ENOENT) 2056 goto done_deref; 2057 #ifdef COMPAT_FREEBSD32 2058 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2059 uint32_t hid32 = pr->pr_hostid; 2060 2061 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2062 } else 2063 #endif 2064 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2065 sizeof(pr->pr_hostid)); 2066 if (error != 0 && error != ENOENT) 2067 goto done_deref; 2068 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2069 sizeof(pr->pr_enforce_statfs)); 2070 if (error != 0 && error != ENOENT) 2071 goto done_deref; 2072 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2073 sizeof(pr->pr_devfs_rsnum)); 2074 if (error != 0 && error != ENOENT) 2075 goto done_deref; 2076 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 2077 fi++) { 2078 if (pr_flag_names[fi] == NULL) 2079 continue; 2080 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2081 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2082 if (error != 0 && error != ENOENT) 2083 goto done_deref; 2084 i = !i; 2085 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2086 if (error != 0 && error != ENOENT) 2087 goto done_deref; 2088 } 2089 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 2090 fi++) { 2091 i = pr->pr_flags & 2092 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2093 i = pr_flag_jailsys[fi].disable && 2094 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2095 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2096 : JAIL_SYS_INHERIT; 2097 error = 2098 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2099 if (error != 0 && error != ENOENT) 2100 goto done_deref; 2101 } 2102 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 2103 fi++) { 2104 if (pr_allow_names[fi] == NULL) 2105 continue; 2106 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2107 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2108 if (error != 0 && error != ENOENT) 2109 goto done_deref; 2110 i = !i; 2111 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2112 if (error != 0 && error != ENOENT) 2113 goto done_deref; 2114 } 2115 i = (pr->pr_uref == 0); 2116 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2117 if (error != 0 && error != ENOENT) 2118 goto done_deref; 2119 i = !i; 2120 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2121 if (error != 0 && error != ENOENT) 2122 goto done_deref; 2123 2124 /* Get the module parameters. */ 2125 mtx_unlock(&pr->pr_mtx); 2126 locked = 0; 2127 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2128 if (error) 2129 goto done_deref; 2130 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2131 2132 /* By now, all parameters should have been noted. */ 2133 TAILQ_FOREACH(opt, opts, link) { 2134 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2135 error = EINVAL; 2136 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2137 goto done_errmsg; 2138 } 2139 } 2140 2141 /* Write the fetched parameters back to userspace. */ 2142 error = 0; 2143 TAILQ_FOREACH(opt, opts, link) { 2144 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2145 pos = 2 * opt->pos + 1; 2146 optuio->uio_iov[pos].iov_len = opt->len; 2147 if (opt->value != NULL) { 2148 if (optuio->uio_segflg == UIO_SYSSPACE) { 2149 bcopy(opt->value, 2150 optuio->uio_iov[pos].iov_base, 2151 opt->len); 2152 } else { 2153 error = copyout(opt->value, 2154 optuio->uio_iov[pos].iov_base, 2155 opt->len); 2156 if (error) 2157 break; 2158 } 2159 } 2160 } 2161 } 2162 goto done_errmsg; 2163 2164 done_deref: 2165 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2166 goto done_errmsg; 2167 2168 done_unlock_list: 2169 sx_sunlock(&allprison_lock); 2170 done_errmsg: 2171 if (error && errmsg_pos >= 0) { 2172 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2173 errmsg_pos = 2 * errmsg_pos + 1; 2174 if (errmsg_len > 0) { 2175 if (optuio->uio_segflg == UIO_SYSSPACE) 2176 bcopy(errmsg, 2177 optuio->uio_iov[errmsg_pos].iov_base, 2178 errmsg_len); 2179 else 2180 copyout(errmsg, 2181 optuio->uio_iov[errmsg_pos].iov_base, 2182 errmsg_len); 2183 } 2184 } 2185 vfs_freeopts(opts); 2186 return (error); 2187 } 2188 2189 2190 /* 2191 * struct jail_remove_args { 2192 * int jid; 2193 * }; 2194 */ 2195 int 2196 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2197 { 2198 struct prison *pr, *cpr, *lpr, *tpr; 2199 int descend, error; 2200 2201 error = priv_check(td, PRIV_JAIL_REMOVE); 2202 if (error) 2203 return (error); 2204 2205 sx_xlock(&allprison_lock); 2206 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2207 if (pr == NULL) { 2208 sx_xunlock(&allprison_lock); 2209 return (EINVAL); 2210 } 2211 2212 /* Remove all descendants of this prison, then remove this prison. */ 2213 pr->pr_ref++; 2214 pr->pr_flags |= PR_REMOVE; 2215 if (!LIST_EMPTY(&pr->pr_children)) { 2216 mtx_unlock(&pr->pr_mtx); 2217 lpr = NULL; 2218 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2219 mtx_lock(&cpr->pr_mtx); 2220 if (cpr->pr_ref > 0) { 2221 tpr = cpr; 2222 cpr->pr_ref++; 2223 cpr->pr_flags |= PR_REMOVE; 2224 } else { 2225 /* Already removed - do not do it again. */ 2226 tpr = NULL; 2227 } 2228 mtx_unlock(&cpr->pr_mtx); 2229 if (lpr != NULL) { 2230 mtx_lock(&lpr->pr_mtx); 2231 prison_remove_one(lpr); 2232 sx_xlock(&allprison_lock); 2233 } 2234 lpr = tpr; 2235 } 2236 if (lpr != NULL) { 2237 mtx_lock(&lpr->pr_mtx); 2238 prison_remove_one(lpr); 2239 sx_xlock(&allprison_lock); 2240 } 2241 mtx_lock(&pr->pr_mtx); 2242 } 2243 prison_remove_one(pr); 2244 return (0); 2245 } 2246 2247 static void 2248 prison_remove_one(struct prison *pr) 2249 { 2250 struct proc *p; 2251 int deuref; 2252 2253 /* If the prison was persistent, it is not anymore. */ 2254 deuref = 0; 2255 if (pr->pr_flags & PR_PERSIST) { 2256 pr->pr_ref--; 2257 deuref = PD_DEUREF; 2258 pr->pr_flags &= ~PR_PERSIST; 2259 } 2260 2261 /* 2262 * jail_remove added a reference. If that's the only one, remove 2263 * the prison now. 2264 */ 2265 KASSERT(pr->pr_ref > 0, 2266 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2267 if (pr->pr_ref == 1) { 2268 prison_deref(pr, 2269 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2270 return; 2271 } 2272 2273 mtx_unlock(&pr->pr_mtx); 2274 sx_xunlock(&allprison_lock); 2275 /* 2276 * Kill all processes unfortunate enough to be attached to this prison. 2277 */ 2278 sx_slock(&allproc_lock); 2279 LIST_FOREACH(p, &allproc, p_list) { 2280 PROC_LOCK(p); 2281 if (p->p_state != PRS_NEW && p->p_ucred && 2282 p->p_ucred->cr_prison == pr) 2283 kern_psignal(p, SIGKILL); 2284 PROC_UNLOCK(p); 2285 } 2286 sx_sunlock(&allproc_lock); 2287 /* Remove the temporary reference added by jail_remove. */ 2288 prison_deref(pr, deuref | PD_DEREF); 2289 } 2290 2291 2292 /* 2293 * struct jail_attach_args { 2294 * int jid; 2295 * }; 2296 */ 2297 int 2298 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2299 { 2300 struct prison *pr; 2301 int error; 2302 2303 error = priv_check(td, PRIV_JAIL_ATTACH); 2304 if (error) 2305 return (error); 2306 2307 sx_slock(&allprison_lock); 2308 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2309 if (pr == NULL) { 2310 sx_sunlock(&allprison_lock); 2311 return (EINVAL); 2312 } 2313 2314 /* 2315 * Do not allow a process to attach to a prison that is not 2316 * considered to be "alive". 2317 */ 2318 if (pr->pr_uref == 0) { 2319 mtx_unlock(&pr->pr_mtx); 2320 sx_sunlock(&allprison_lock); 2321 return (EINVAL); 2322 } 2323 2324 return (do_jail_attach(td, pr)); 2325 } 2326 2327 static int 2328 do_jail_attach(struct thread *td, struct prison *pr) 2329 { 2330 struct prison *ppr; 2331 struct proc *p; 2332 struct ucred *newcred, *oldcred; 2333 int error; 2334 2335 /* 2336 * XXX: Note that there is a slight race here if two threads 2337 * in the same privileged process attempt to attach to two 2338 * different jails at the same time. It is important for 2339 * user processes not to do this, or they might end up with 2340 * a process root from one prison, but attached to the jail 2341 * of another. 2342 */ 2343 pr->pr_ref++; 2344 pr->pr_uref++; 2345 mtx_unlock(&pr->pr_mtx); 2346 2347 /* Let modules do whatever they need to prepare for attaching. */ 2348 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2349 if (error) { 2350 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2351 return (error); 2352 } 2353 sx_sunlock(&allprison_lock); 2354 2355 /* 2356 * Reparent the newly attached process to this jail. 2357 */ 2358 ppr = td->td_ucred->cr_prison; 2359 p = td->td_proc; 2360 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2361 if (error) 2362 goto e_revert_osd; 2363 2364 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2365 if ((error = change_dir(pr->pr_root, td)) != 0) 2366 goto e_unlock; 2367 #ifdef MAC 2368 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2369 goto e_unlock; 2370 #endif 2371 VOP_UNLOCK(pr->pr_root, 0); 2372 if ((error = change_root(pr->pr_root, td))) 2373 goto e_revert_osd; 2374 2375 newcred = crget(); 2376 PROC_LOCK(p); 2377 oldcred = p->p_ucred; 2378 setsugid(p); 2379 crcopy(newcred, oldcred); 2380 newcred->cr_prison = pr; 2381 p->p_ucred = newcred; 2382 PROC_UNLOCK(p); 2383 #ifdef RACCT 2384 racct_proc_ucred_changed(p, oldcred, newcred); 2385 #endif 2386 crfree(oldcred); 2387 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2388 return (0); 2389 e_unlock: 2390 VOP_UNLOCK(pr->pr_root, 0); 2391 e_revert_osd: 2392 /* Tell modules this thread is still in its old jail after all. */ 2393 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2394 prison_deref(pr, PD_DEREF | PD_DEUREF); 2395 return (error); 2396 } 2397 2398 2399 /* 2400 * Returns a locked prison instance, or NULL on failure. 2401 */ 2402 struct prison * 2403 prison_find(int prid) 2404 { 2405 struct prison *pr; 2406 2407 sx_assert(&allprison_lock, SX_LOCKED); 2408 TAILQ_FOREACH(pr, &allprison, pr_list) { 2409 if (pr->pr_id == prid) { 2410 mtx_lock(&pr->pr_mtx); 2411 if (pr->pr_ref > 0) 2412 return (pr); 2413 mtx_unlock(&pr->pr_mtx); 2414 } 2415 } 2416 return (NULL); 2417 } 2418 2419 /* 2420 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2421 */ 2422 struct prison * 2423 prison_find_child(struct prison *mypr, int prid) 2424 { 2425 struct prison *pr; 2426 int descend; 2427 2428 sx_assert(&allprison_lock, SX_LOCKED); 2429 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2430 if (pr->pr_id == prid) { 2431 mtx_lock(&pr->pr_mtx); 2432 if (pr->pr_ref > 0) 2433 return (pr); 2434 mtx_unlock(&pr->pr_mtx); 2435 } 2436 } 2437 return (NULL); 2438 } 2439 2440 /* 2441 * Look for the name relative to mypr. Returns a locked prison or NULL. 2442 */ 2443 struct prison * 2444 prison_find_name(struct prison *mypr, const char *name) 2445 { 2446 struct prison *pr, *deadpr; 2447 size_t mylen; 2448 int descend; 2449 2450 sx_assert(&allprison_lock, SX_LOCKED); 2451 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2452 again: 2453 deadpr = NULL; 2454 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2455 if (!strcmp(pr->pr_name + mylen, name)) { 2456 mtx_lock(&pr->pr_mtx); 2457 if (pr->pr_ref > 0) { 2458 if (pr->pr_uref > 0) 2459 return (pr); 2460 deadpr = pr; 2461 } 2462 mtx_unlock(&pr->pr_mtx); 2463 } 2464 } 2465 /* There was no valid prison - perhaps there was a dying one. */ 2466 if (deadpr != NULL) { 2467 mtx_lock(&deadpr->pr_mtx); 2468 if (deadpr->pr_ref == 0) { 2469 mtx_unlock(&deadpr->pr_mtx); 2470 goto again; 2471 } 2472 } 2473 return (deadpr); 2474 } 2475 2476 /* 2477 * See if a prison has the specific flag set. 2478 */ 2479 int 2480 prison_flag(struct ucred *cred, unsigned flag) 2481 { 2482 2483 /* This is an atomic read, so no locking is necessary. */ 2484 return (cred->cr_prison->pr_flags & flag); 2485 } 2486 2487 int 2488 prison_allow(struct ucred *cred, unsigned flag) 2489 { 2490 2491 /* This is an atomic read, so no locking is necessary. */ 2492 return (cred->cr_prison->pr_allow & flag); 2493 } 2494 2495 /* 2496 * Remove a prison reference. If that was the last reference, remove the 2497 * prison itself - but not in this context in case there are locks held. 2498 */ 2499 void 2500 prison_free_locked(struct prison *pr) 2501 { 2502 2503 mtx_assert(&pr->pr_mtx, MA_OWNED); 2504 pr->pr_ref--; 2505 if (pr->pr_ref == 0) { 2506 mtx_unlock(&pr->pr_mtx); 2507 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2508 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2509 return; 2510 } 2511 mtx_unlock(&pr->pr_mtx); 2512 } 2513 2514 void 2515 prison_free(struct prison *pr) 2516 { 2517 2518 mtx_lock(&pr->pr_mtx); 2519 prison_free_locked(pr); 2520 } 2521 2522 static void 2523 prison_complete(void *context, int pending) 2524 { 2525 2526 prison_deref((struct prison *)context, 0); 2527 } 2528 2529 /* 2530 * Remove a prison reference (usually). This internal version assumes no 2531 * mutexes are held, except perhaps the prison itself. If there are no more 2532 * references, release and delist the prison. On completion, the prison lock 2533 * and the allprison lock are both unlocked. 2534 */ 2535 static void 2536 prison_deref(struct prison *pr, int flags) 2537 { 2538 struct prison *ppr, *tpr; 2539 2540 if (!(flags & PD_LOCKED)) 2541 mtx_lock(&pr->pr_mtx); 2542 for (;;) { 2543 if (flags & PD_DEUREF) { 2544 pr->pr_uref--; 2545 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2546 } 2547 if (flags & PD_DEREF) 2548 pr->pr_ref--; 2549 /* If the prison still has references, nothing else to do. */ 2550 if (pr->pr_ref > 0) { 2551 mtx_unlock(&pr->pr_mtx); 2552 if (flags & PD_LIST_SLOCKED) 2553 sx_sunlock(&allprison_lock); 2554 else if (flags & PD_LIST_XLOCKED) 2555 sx_xunlock(&allprison_lock); 2556 return; 2557 } 2558 2559 mtx_unlock(&pr->pr_mtx); 2560 if (flags & PD_LIST_SLOCKED) { 2561 if (!sx_try_upgrade(&allprison_lock)) { 2562 sx_sunlock(&allprison_lock); 2563 sx_xlock(&allprison_lock); 2564 } 2565 } else if (!(flags & PD_LIST_XLOCKED)) 2566 sx_xlock(&allprison_lock); 2567 2568 TAILQ_REMOVE(&allprison, pr, pr_list); 2569 LIST_REMOVE(pr, pr_sibling); 2570 ppr = pr->pr_parent; 2571 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2572 tpr->pr_childcount--; 2573 sx_xunlock(&allprison_lock); 2574 2575 #ifdef VIMAGE 2576 if (pr->pr_vnet != ppr->pr_vnet) 2577 vnet_destroy(pr->pr_vnet); 2578 #endif 2579 if (pr->pr_root != NULL) 2580 vrele(pr->pr_root); 2581 mtx_destroy(&pr->pr_mtx); 2582 #ifdef INET 2583 free(pr->pr_ip4, M_PRISON); 2584 #endif 2585 #ifdef INET6 2586 free(pr->pr_ip6, M_PRISON); 2587 #endif 2588 if (pr->pr_cpuset != NULL) 2589 cpuset_rel(pr->pr_cpuset); 2590 osd_jail_exit(pr); 2591 #ifdef RACCT 2592 prison_racct_detach(pr); 2593 #endif 2594 free(pr, M_PRISON); 2595 2596 /* Removing a prison frees a reference on its parent. */ 2597 pr = ppr; 2598 mtx_lock(&pr->pr_mtx); 2599 flags = PD_DEREF | PD_DEUREF; 2600 } 2601 } 2602 2603 void 2604 prison_hold_locked(struct prison *pr) 2605 { 2606 2607 mtx_assert(&pr->pr_mtx, MA_OWNED); 2608 KASSERT(pr->pr_ref > 0, 2609 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2610 pr->pr_ref++; 2611 } 2612 2613 void 2614 prison_hold(struct prison *pr) 2615 { 2616 2617 mtx_lock(&pr->pr_mtx); 2618 prison_hold_locked(pr); 2619 mtx_unlock(&pr->pr_mtx); 2620 } 2621 2622 void 2623 prison_proc_hold(struct prison *pr) 2624 { 2625 2626 mtx_lock(&pr->pr_mtx); 2627 KASSERT(pr->pr_uref > 0, 2628 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2629 pr->pr_uref++; 2630 mtx_unlock(&pr->pr_mtx); 2631 } 2632 2633 void 2634 prison_proc_free(struct prison *pr) 2635 { 2636 2637 mtx_lock(&pr->pr_mtx); 2638 KASSERT(pr->pr_uref > 0, 2639 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2640 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2641 } 2642 2643 2644 #ifdef INET 2645 /* 2646 * Restrict a prison's IP address list with its parent's, possibly replacing 2647 * it. Return true if the replacement buffer was used (or would have been). 2648 */ 2649 static int 2650 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2651 { 2652 int ii, ij, used; 2653 struct prison *ppr; 2654 2655 ppr = pr->pr_parent; 2656 if (!(pr->pr_flags & PR_IP4_USER)) { 2657 /* This has no user settings, so just copy the parent's list. */ 2658 if (pr->pr_ip4s < ppr->pr_ip4s) { 2659 /* 2660 * There's no room for the parent's list. Use the 2661 * new list buffer, which is assumed to be big enough 2662 * (if it was passed). If there's no buffer, try to 2663 * allocate one. 2664 */ 2665 used = 1; 2666 if (newip4 == NULL) { 2667 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2668 M_PRISON, M_NOWAIT); 2669 if (newip4 != NULL) 2670 used = 0; 2671 } 2672 if (newip4 != NULL) { 2673 bcopy(ppr->pr_ip4, newip4, 2674 ppr->pr_ip4s * sizeof(*newip4)); 2675 free(pr->pr_ip4, M_PRISON); 2676 pr->pr_ip4 = newip4; 2677 pr->pr_ip4s = ppr->pr_ip4s; 2678 } 2679 return (used); 2680 } 2681 pr->pr_ip4s = ppr->pr_ip4s; 2682 if (pr->pr_ip4s > 0) 2683 bcopy(ppr->pr_ip4, pr->pr_ip4, 2684 pr->pr_ip4s * sizeof(*newip4)); 2685 else if (pr->pr_ip4 != NULL) { 2686 free(pr->pr_ip4, M_PRISON); 2687 pr->pr_ip4 = NULL; 2688 } 2689 } else if (pr->pr_ip4s > 0) { 2690 /* Remove addresses that aren't in the parent. */ 2691 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2692 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2693 break; 2694 if (ij < ppr->pr_ip4s) 2695 ii = 1; 2696 else { 2697 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2698 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2699 ii = 0; 2700 } 2701 for (ij = 1; ii < pr->pr_ip4s; ) { 2702 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2703 ii++; 2704 continue; 2705 } 2706 switch (ij >= ppr->pr_ip4s ? -1 : 2707 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2708 case -1: 2709 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2710 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2711 break; 2712 case 0: 2713 ii++; 2714 ij++; 2715 break; 2716 case 1: 2717 ij++; 2718 break; 2719 } 2720 } 2721 if (pr->pr_ip4s == 0) { 2722 pr->pr_flags |= PR_IP4_DISABLE; 2723 free(pr->pr_ip4, M_PRISON); 2724 pr->pr_ip4 = NULL; 2725 } 2726 } 2727 return (0); 2728 } 2729 2730 /* 2731 * Pass back primary IPv4 address of this jail. 2732 * 2733 * If not restricted return success but do not alter the address. Caller has 2734 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2735 * 2736 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2737 * Address returned in NBO. 2738 */ 2739 int 2740 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2741 { 2742 struct prison *pr; 2743 2744 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2745 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2746 2747 pr = cred->cr_prison; 2748 if (!(pr->pr_flags & PR_IP4)) 2749 return (0); 2750 mtx_lock(&pr->pr_mtx); 2751 if (!(pr->pr_flags & PR_IP4)) { 2752 mtx_unlock(&pr->pr_mtx); 2753 return (0); 2754 } 2755 if (pr->pr_ip4 == NULL) { 2756 mtx_unlock(&pr->pr_mtx); 2757 return (EAFNOSUPPORT); 2758 } 2759 2760 ia->s_addr = pr->pr_ip4[0].s_addr; 2761 mtx_unlock(&pr->pr_mtx); 2762 return (0); 2763 } 2764 2765 /* 2766 * Return 1 if we should do proper source address selection or are not jailed. 2767 * We will return 0 if we should bypass source address selection in favour 2768 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2769 * returned in NBO. 2770 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2771 */ 2772 int 2773 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2774 { 2775 struct prison *pr; 2776 struct in_addr lia; 2777 int error; 2778 2779 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2780 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2781 2782 if (!jailed(cred)) 2783 return (1); 2784 2785 pr = cred->cr_prison; 2786 if (pr->pr_flags & PR_IP4_SADDRSEL) 2787 return (1); 2788 2789 lia.s_addr = INADDR_ANY; 2790 error = prison_get_ip4(cred, &lia); 2791 if (error) 2792 return (error); 2793 if (lia.s_addr == INADDR_ANY) 2794 return (1); 2795 2796 ia->s_addr = lia.s_addr; 2797 return (0); 2798 } 2799 2800 /* 2801 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2802 */ 2803 int 2804 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2805 { 2806 2807 if (pr1 == pr2) 2808 return (1); 2809 2810 /* 2811 * No need to lock since the PR_IP4_USER flag can't be altered for 2812 * existing prisons. 2813 */ 2814 while (pr1 != &prison0 && 2815 #ifdef VIMAGE 2816 !(pr1->pr_flags & PR_VNET) && 2817 #endif 2818 !(pr1->pr_flags & PR_IP4_USER)) 2819 pr1 = pr1->pr_parent; 2820 while (pr2 != &prison0 && 2821 #ifdef VIMAGE 2822 !(pr2->pr_flags & PR_VNET) && 2823 #endif 2824 !(pr2->pr_flags & PR_IP4_USER)) 2825 pr2 = pr2->pr_parent; 2826 return (pr1 == pr2); 2827 } 2828 2829 /* 2830 * Make sure our (source) address is set to something meaningful to this 2831 * jail. 2832 * 2833 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2834 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2835 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2836 */ 2837 int 2838 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2839 { 2840 struct prison *pr; 2841 struct in_addr ia0; 2842 int error; 2843 2844 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2845 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2846 2847 pr = cred->cr_prison; 2848 if (!(pr->pr_flags & PR_IP4)) 2849 return (0); 2850 mtx_lock(&pr->pr_mtx); 2851 if (!(pr->pr_flags & PR_IP4)) { 2852 mtx_unlock(&pr->pr_mtx); 2853 return (0); 2854 } 2855 if (pr->pr_ip4 == NULL) { 2856 mtx_unlock(&pr->pr_mtx); 2857 return (EAFNOSUPPORT); 2858 } 2859 2860 ia0.s_addr = ntohl(ia->s_addr); 2861 if (ia0.s_addr == INADDR_LOOPBACK) { 2862 ia->s_addr = pr->pr_ip4[0].s_addr; 2863 mtx_unlock(&pr->pr_mtx); 2864 return (0); 2865 } 2866 2867 if (ia0.s_addr == INADDR_ANY) { 2868 /* 2869 * In case there is only 1 IPv4 address, bind directly. 2870 */ 2871 if (pr->pr_ip4s == 1) 2872 ia->s_addr = pr->pr_ip4[0].s_addr; 2873 mtx_unlock(&pr->pr_mtx); 2874 return (0); 2875 } 2876 2877 error = _prison_check_ip4(pr, ia); 2878 mtx_unlock(&pr->pr_mtx); 2879 return (error); 2880 } 2881 2882 /* 2883 * Rewrite destination address in case we will connect to loopback address. 2884 * 2885 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2886 * Address passed in in NBO and returned in NBO. 2887 */ 2888 int 2889 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2890 { 2891 struct prison *pr; 2892 2893 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2894 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2895 2896 pr = cred->cr_prison; 2897 if (!(pr->pr_flags & PR_IP4)) 2898 return (0); 2899 mtx_lock(&pr->pr_mtx); 2900 if (!(pr->pr_flags & PR_IP4)) { 2901 mtx_unlock(&pr->pr_mtx); 2902 return (0); 2903 } 2904 if (pr->pr_ip4 == NULL) { 2905 mtx_unlock(&pr->pr_mtx); 2906 return (EAFNOSUPPORT); 2907 } 2908 2909 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2910 ia->s_addr = pr->pr_ip4[0].s_addr; 2911 mtx_unlock(&pr->pr_mtx); 2912 return (0); 2913 } 2914 2915 /* 2916 * Return success because nothing had to be changed. 2917 */ 2918 mtx_unlock(&pr->pr_mtx); 2919 return (0); 2920 } 2921 2922 /* 2923 * Check if given address belongs to the jail referenced by cred/prison. 2924 * 2925 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2926 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2927 * doesn't allow IPv4. Address passed in in NBO. 2928 */ 2929 static int 2930 _prison_check_ip4(struct prison *pr, struct in_addr *ia) 2931 { 2932 int i, a, z, d; 2933 2934 /* 2935 * Check the primary IP. 2936 */ 2937 if (pr->pr_ip4[0].s_addr == ia->s_addr) 2938 return (0); 2939 2940 /* 2941 * All the other IPs are sorted so we can do a binary search. 2942 */ 2943 a = 0; 2944 z = pr->pr_ip4s - 2; 2945 while (a <= z) { 2946 i = (a + z) / 2; 2947 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 2948 if (d > 0) 2949 z = i - 1; 2950 else if (d < 0) 2951 a = i + 1; 2952 else 2953 return (0); 2954 } 2955 2956 return (EADDRNOTAVAIL); 2957 } 2958 2959 int 2960 prison_check_ip4(struct ucred *cred, struct in_addr *ia) 2961 { 2962 struct prison *pr; 2963 int error; 2964 2965 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2966 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2967 2968 pr = cred->cr_prison; 2969 if (!(pr->pr_flags & PR_IP4)) 2970 return (0); 2971 mtx_lock(&pr->pr_mtx); 2972 if (!(pr->pr_flags & PR_IP4)) { 2973 mtx_unlock(&pr->pr_mtx); 2974 return (0); 2975 } 2976 if (pr->pr_ip4 == NULL) { 2977 mtx_unlock(&pr->pr_mtx); 2978 return (EAFNOSUPPORT); 2979 } 2980 2981 error = _prison_check_ip4(pr, ia); 2982 mtx_unlock(&pr->pr_mtx); 2983 return (error); 2984 } 2985 #endif 2986 2987 #ifdef INET6 2988 static int 2989 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 2990 { 2991 int ii, ij, used; 2992 struct prison *ppr; 2993 2994 ppr = pr->pr_parent; 2995 if (!(pr->pr_flags & PR_IP6_USER)) { 2996 /* This has no user settings, so just copy the parent's list. */ 2997 if (pr->pr_ip6s < ppr->pr_ip6s) { 2998 /* 2999 * There's no room for the parent's list. Use the 3000 * new list buffer, which is assumed to be big enough 3001 * (if it was passed). If there's no buffer, try to 3002 * allocate one. 3003 */ 3004 used = 1; 3005 if (newip6 == NULL) { 3006 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 3007 M_PRISON, M_NOWAIT); 3008 if (newip6 != NULL) 3009 used = 0; 3010 } 3011 if (newip6 != NULL) { 3012 bcopy(ppr->pr_ip6, newip6, 3013 ppr->pr_ip6s * sizeof(*newip6)); 3014 free(pr->pr_ip6, M_PRISON); 3015 pr->pr_ip6 = newip6; 3016 pr->pr_ip6s = ppr->pr_ip6s; 3017 } 3018 return (used); 3019 } 3020 pr->pr_ip6s = ppr->pr_ip6s; 3021 if (pr->pr_ip6s > 0) 3022 bcopy(ppr->pr_ip6, pr->pr_ip6, 3023 pr->pr_ip6s * sizeof(*newip6)); 3024 else if (pr->pr_ip6 != NULL) { 3025 free(pr->pr_ip6, M_PRISON); 3026 pr->pr_ip6 = NULL; 3027 } 3028 } else if (pr->pr_ip6s > 0) { 3029 /* Remove addresses that aren't in the parent. */ 3030 for (ij = 0; ij < ppr->pr_ip6s; ij++) 3031 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 3032 &ppr->pr_ip6[ij])) 3033 break; 3034 if (ij < ppr->pr_ip6s) 3035 ii = 1; 3036 else { 3037 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 3038 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 3039 ii = 0; 3040 } 3041 for (ij = 1; ii < pr->pr_ip6s; ) { 3042 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 3043 &ppr->pr_ip6[0])) { 3044 ii++; 3045 continue; 3046 } 3047 switch (ij >= ppr->pr_ip4s ? -1 : 3048 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 3049 case -1: 3050 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 3051 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 3052 break; 3053 case 0: 3054 ii++; 3055 ij++; 3056 break; 3057 case 1: 3058 ij++; 3059 break; 3060 } 3061 } 3062 if (pr->pr_ip6s == 0) { 3063 pr->pr_flags |= PR_IP6_DISABLE; 3064 free(pr->pr_ip6, M_PRISON); 3065 pr->pr_ip6 = NULL; 3066 } 3067 } 3068 return 0; 3069 } 3070 3071 /* 3072 * Pass back primary IPv6 address for this jail. 3073 * 3074 * If not restricted return success but do not alter the address. Caller has 3075 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3076 * 3077 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3078 */ 3079 int 3080 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3081 { 3082 struct prison *pr; 3083 3084 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3085 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3086 3087 pr = cred->cr_prison; 3088 if (!(pr->pr_flags & PR_IP6)) 3089 return (0); 3090 mtx_lock(&pr->pr_mtx); 3091 if (!(pr->pr_flags & PR_IP6)) { 3092 mtx_unlock(&pr->pr_mtx); 3093 return (0); 3094 } 3095 if (pr->pr_ip6 == NULL) { 3096 mtx_unlock(&pr->pr_mtx); 3097 return (EAFNOSUPPORT); 3098 } 3099 3100 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3101 mtx_unlock(&pr->pr_mtx); 3102 return (0); 3103 } 3104 3105 /* 3106 * Return 1 if we should do proper source address selection or are not jailed. 3107 * We will return 0 if we should bypass source address selection in favour 3108 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3109 * returned in NBO. 3110 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3111 */ 3112 int 3113 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3114 { 3115 struct prison *pr; 3116 struct in6_addr lia6; 3117 int error; 3118 3119 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3120 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3121 3122 if (!jailed(cred)) 3123 return (1); 3124 3125 pr = cred->cr_prison; 3126 if (pr->pr_flags & PR_IP6_SADDRSEL) 3127 return (1); 3128 3129 lia6 = in6addr_any; 3130 error = prison_get_ip6(cred, &lia6); 3131 if (error) 3132 return (error); 3133 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3134 return (1); 3135 3136 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3137 return (0); 3138 } 3139 3140 /* 3141 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3142 */ 3143 int 3144 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3145 { 3146 3147 if (pr1 == pr2) 3148 return (1); 3149 3150 while (pr1 != &prison0 && 3151 #ifdef VIMAGE 3152 !(pr1->pr_flags & PR_VNET) && 3153 #endif 3154 !(pr1->pr_flags & PR_IP6_USER)) 3155 pr1 = pr1->pr_parent; 3156 while (pr2 != &prison0 && 3157 #ifdef VIMAGE 3158 !(pr2->pr_flags & PR_VNET) && 3159 #endif 3160 !(pr2->pr_flags & PR_IP6_USER)) 3161 pr2 = pr2->pr_parent; 3162 return (pr1 == pr2); 3163 } 3164 3165 /* 3166 * Make sure our (source) address is set to something meaningful to this jail. 3167 * 3168 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3169 * when needed while binding. 3170 * 3171 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3172 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3173 * doesn't allow IPv6. 3174 */ 3175 int 3176 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3177 { 3178 struct prison *pr; 3179 int error; 3180 3181 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3182 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3183 3184 pr = cred->cr_prison; 3185 if (!(pr->pr_flags & PR_IP6)) 3186 return (0); 3187 mtx_lock(&pr->pr_mtx); 3188 if (!(pr->pr_flags & PR_IP6)) { 3189 mtx_unlock(&pr->pr_mtx); 3190 return (0); 3191 } 3192 if (pr->pr_ip6 == NULL) { 3193 mtx_unlock(&pr->pr_mtx); 3194 return (EAFNOSUPPORT); 3195 } 3196 3197 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3198 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3199 mtx_unlock(&pr->pr_mtx); 3200 return (0); 3201 } 3202 3203 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3204 /* 3205 * In case there is only 1 IPv6 address, and v6only is true, 3206 * then bind directly. 3207 */ 3208 if (v6only != 0 && pr->pr_ip6s == 1) 3209 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3210 mtx_unlock(&pr->pr_mtx); 3211 return (0); 3212 } 3213 3214 error = _prison_check_ip6(pr, ia6); 3215 mtx_unlock(&pr->pr_mtx); 3216 return (error); 3217 } 3218 3219 /* 3220 * Rewrite destination address in case we will connect to loopback address. 3221 * 3222 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3223 */ 3224 int 3225 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3226 { 3227 struct prison *pr; 3228 3229 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3230 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3231 3232 pr = cred->cr_prison; 3233 if (!(pr->pr_flags & PR_IP6)) 3234 return (0); 3235 mtx_lock(&pr->pr_mtx); 3236 if (!(pr->pr_flags & PR_IP6)) { 3237 mtx_unlock(&pr->pr_mtx); 3238 return (0); 3239 } 3240 if (pr->pr_ip6 == NULL) { 3241 mtx_unlock(&pr->pr_mtx); 3242 return (EAFNOSUPPORT); 3243 } 3244 3245 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3246 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3247 mtx_unlock(&pr->pr_mtx); 3248 return (0); 3249 } 3250 3251 /* 3252 * Return success because nothing had to be changed. 3253 */ 3254 mtx_unlock(&pr->pr_mtx); 3255 return (0); 3256 } 3257 3258 /* 3259 * Check if given address belongs to the jail referenced by cred/prison. 3260 * 3261 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3262 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3263 * doesn't allow IPv6. 3264 */ 3265 static int 3266 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3267 { 3268 int i, a, z, d; 3269 3270 /* 3271 * Check the primary IP. 3272 */ 3273 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3274 return (0); 3275 3276 /* 3277 * All the other IPs are sorted so we can do a binary search. 3278 */ 3279 a = 0; 3280 z = pr->pr_ip6s - 2; 3281 while (a <= z) { 3282 i = (a + z) / 2; 3283 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3284 if (d > 0) 3285 z = i - 1; 3286 else if (d < 0) 3287 a = i + 1; 3288 else 3289 return (0); 3290 } 3291 3292 return (EADDRNOTAVAIL); 3293 } 3294 3295 int 3296 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3297 { 3298 struct prison *pr; 3299 int error; 3300 3301 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3302 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3303 3304 pr = cred->cr_prison; 3305 if (!(pr->pr_flags & PR_IP6)) 3306 return (0); 3307 mtx_lock(&pr->pr_mtx); 3308 if (!(pr->pr_flags & PR_IP6)) { 3309 mtx_unlock(&pr->pr_mtx); 3310 return (0); 3311 } 3312 if (pr->pr_ip6 == NULL) { 3313 mtx_unlock(&pr->pr_mtx); 3314 return (EAFNOSUPPORT); 3315 } 3316 3317 error = _prison_check_ip6(pr, ia6); 3318 mtx_unlock(&pr->pr_mtx); 3319 return (error); 3320 } 3321 #endif 3322 3323 /* 3324 * Check if a jail supports the given address family. 3325 * 3326 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3327 * if not. 3328 */ 3329 int 3330 prison_check_af(struct ucred *cred, int af) 3331 { 3332 struct prison *pr; 3333 int error; 3334 3335 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3336 3337 pr = cred->cr_prison; 3338 #ifdef VIMAGE 3339 /* Prisons with their own network stack are not limited. */ 3340 if (prison_owns_vnet(cred)) 3341 return (0); 3342 #endif 3343 3344 error = 0; 3345 switch (af) 3346 { 3347 #ifdef INET 3348 case AF_INET: 3349 if (pr->pr_flags & PR_IP4) 3350 { 3351 mtx_lock(&pr->pr_mtx); 3352 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3353 error = EAFNOSUPPORT; 3354 mtx_unlock(&pr->pr_mtx); 3355 } 3356 break; 3357 #endif 3358 #ifdef INET6 3359 case AF_INET6: 3360 if (pr->pr_flags & PR_IP6) 3361 { 3362 mtx_lock(&pr->pr_mtx); 3363 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3364 error = EAFNOSUPPORT; 3365 mtx_unlock(&pr->pr_mtx); 3366 } 3367 break; 3368 #endif 3369 case AF_LOCAL: 3370 case AF_ROUTE: 3371 break; 3372 default: 3373 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3374 error = EAFNOSUPPORT; 3375 } 3376 return (error); 3377 } 3378 3379 /* 3380 * Check if given address belongs to the jail referenced by cred (wrapper to 3381 * prison_check_ip[46]). 3382 * 3383 * Returns 0 if jail doesn't restrict the address family or if address belongs 3384 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3385 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3386 */ 3387 int 3388 prison_if(struct ucred *cred, struct sockaddr *sa) 3389 { 3390 #ifdef INET 3391 struct sockaddr_in *sai; 3392 #endif 3393 #ifdef INET6 3394 struct sockaddr_in6 *sai6; 3395 #endif 3396 int error; 3397 3398 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3399 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3400 3401 #ifdef VIMAGE 3402 if (prison_owns_vnet(cred)) 3403 return (0); 3404 #endif 3405 3406 error = 0; 3407 switch (sa->sa_family) 3408 { 3409 #ifdef INET 3410 case AF_INET: 3411 sai = (struct sockaddr_in *)sa; 3412 error = prison_check_ip4(cred, &sai->sin_addr); 3413 break; 3414 #endif 3415 #ifdef INET6 3416 case AF_INET6: 3417 sai6 = (struct sockaddr_in6 *)sa; 3418 error = prison_check_ip6(cred, &sai6->sin6_addr); 3419 break; 3420 #endif 3421 default: 3422 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3423 error = EAFNOSUPPORT; 3424 } 3425 return (error); 3426 } 3427 3428 /* 3429 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3430 */ 3431 int 3432 prison_check(struct ucred *cred1, struct ucred *cred2) 3433 { 3434 3435 return ((cred1->cr_prison == cred2->cr_prison || 3436 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3437 } 3438 3439 /* 3440 * Return 1 if p2 is a child of p1, otherwise 0. 3441 */ 3442 int 3443 prison_ischild(struct prison *pr1, struct prison *pr2) 3444 { 3445 3446 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3447 if (pr1 == pr2) 3448 return (1); 3449 return (0); 3450 } 3451 3452 /* 3453 * Return 1 if the passed credential is in a jail, otherwise 0. 3454 */ 3455 int 3456 jailed(struct ucred *cred) 3457 { 3458 3459 return (cred->cr_prison != &prison0); 3460 } 3461 3462 /* 3463 * Return 1 if the passed credential is in a jail and that jail does not 3464 * have its own virtual network stack, otherwise 0. 3465 */ 3466 int 3467 jailed_without_vnet(struct ucred *cred) 3468 { 3469 3470 if (!jailed(cred)) 3471 return (0); 3472 #ifdef VIMAGE 3473 if (prison_owns_vnet(cred)) 3474 return (0); 3475 #endif 3476 3477 return (1); 3478 } 3479 3480 /* 3481 * Return the correct hostname (domainname, et al) for the passed credential. 3482 */ 3483 void 3484 getcredhostname(struct ucred *cred, char *buf, size_t size) 3485 { 3486 struct prison *pr; 3487 3488 /* 3489 * A NULL credential can be used to shortcut to the physical 3490 * system's hostname. 3491 */ 3492 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3493 mtx_lock(&pr->pr_mtx); 3494 strlcpy(buf, pr->pr_hostname, size); 3495 mtx_unlock(&pr->pr_mtx); 3496 } 3497 3498 void 3499 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3500 { 3501 3502 mtx_lock(&cred->cr_prison->pr_mtx); 3503 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3504 mtx_unlock(&cred->cr_prison->pr_mtx); 3505 } 3506 3507 void 3508 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3509 { 3510 3511 mtx_lock(&cred->cr_prison->pr_mtx); 3512 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3513 mtx_unlock(&cred->cr_prison->pr_mtx); 3514 } 3515 3516 void 3517 getcredhostid(struct ucred *cred, unsigned long *hostid) 3518 { 3519 3520 mtx_lock(&cred->cr_prison->pr_mtx); 3521 *hostid = cred->cr_prison->pr_hostid; 3522 mtx_unlock(&cred->cr_prison->pr_mtx); 3523 } 3524 3525 #ifdef VIMAGE 3526 /* 3527 * Determine whether the prison represented by cred owns 3528 * its vnet rather than having it inherited. 3529 * 3530 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3531 */ 3532 int 3533 prison_owns_vnet(struct ucred *cred) 3534 { 3535 3536 /* 3537 * vnets cannot be added/removed after jail creation, 3538 * so no need to lock here. 3539 */ 3540 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3541 } 3542 #endif 3543 3544 /* 3545 * Determine whether the subject represented by cred can "see" 3546 * status of a mount point. 3547 * Returns: 0 for permitted, ENOENT otherwise. 3548 * XXX: This function should be called cr_canseemount() and should be 3549 * placed in kern_prot.c. 3550 */ 3551 int 3552 prison_canseemount(struct ucred *cred, struct mount *mp) 3553 { 3554 struct prison *pr; 3555 struct statfs *sp; 3556 size_t len; 3557 3558 pr = cred->cr_prison; 3559 if (pr->pr_enforce_statfs == 0) 3560 return (0); 3561 if (pr->pr_root->v_mount == mp) 3562 return (0); 3563 if (pr->pr_enforce_statfs == 2) 3564 return (ENOENT); 3565 /* 3566 * If jail's chroot directory is set to "/" we should be able to see 3567 * all mount-points from inside a jail. 3568 * This is ugly check, but this is the only situation when jail's 3569 * directory ends with '/'. 3570 */ 3571 if (strcmp(pr->pr_path, "/") == 0) 3572 return (0); 3573 len = strlen(pr->pr_path); 3574 sp = &mp->mnt_stat; 3575 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3576 return (ENOENT); 3577 /* 3578 * Be sure that we don't have situation where jail's root directory 3579 * is "/some/path" and mount point is "/some/pathpath". 3580 */ 3581 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3582 return (ENOENT); 3583 return (0); 3584 } 3585 3586 void 3587 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3588 { 3589 char jpath[MAXPATHLEN]; 3590 struct prison *pr; 3591 size_t len; 3592 3593 pr = cred->cr_prison; 3594 if (pr->pr_enforce_statfs == 0) 3595 return; 3596 if (prison_canseemount(cred, mp) != 0) { 3597 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3598 strlcpy(sp->f_mntonname, "[restricted]", 3599 sizeof(sp->f_mntonname)); 3600 return; 3601 } 3602 if (pr->pr_root->v_mount == mp) { 3603 /* 3604 * Clear current buffer data, so we are sure nothing from 3605 * the valid path left there. 3606 */ 3607 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3608 *sp->f_mntonname = '/'; 3609 return; 3610 } 3611 /* 3612 * If jail's chroot directory is set to "/" we should be able to see 3613 * all mount-points from inside a jail. 3614 */ 3615 if (strcmp(pr->pr_path, "/") == 0) 3616 return; 3617 len = strlen(pr->pr_path); 3618 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3619 /* 3620 * Clear current buffer data, so we are sure nothing from 3621 * the valid path left there. 3622 */ 3623 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3624 if (*jpath == '\0') { 3625 /* Should never happen. */ 3626 *sp->f_mntonname = '/'; 3627 } else { 3628 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3629 } 3630 } 3631 3632 /* 3633 * Check with permission for a specific privilege is granted within jail. We 3634 * have a specific list of accepted privileges; the rest are denied. 3635 */ 3636 int 3637 prison_priv_check(struct ucred *cred, int priv) 3638 { 3639 3640 if (!jailed(cred)) 3641 return (0); 3642 3643 #ifdef VIMAGE 3644 /* 3645 * Privileges specific to prisons with a virtual network stack. 3646 * There might be a duplicate entry here in case the privilege 3647 * is only granted conditionally in the legacy jail case. 3648 */ 3649 switch (priv) { 3650 #ifdef notyet 3651 /* 3652 * NFS-specific privileges. 3653 */ 3654 case PRIV_NFS_DAEMON: 3655 case PRIV_NFS_LOCKD: 3656 #endif 3657 /* 3658 * Network stack privileges. 3659 */ 3660 case PRIV_NET_BRIDGE: 3661 case PRIV_NET_GRE: 3662 case PRIV_NET_BPF: 3663 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3664 case PRIV_NET_ROUTE: 3665 case PRIV_NET_TAP: 3666 case PRIV_NET_SETIFMTU: 3667 case PRIV_NET_SETIFFLAGS: 3668 case PRIV_NET_SETIFCAP: 3669 case PRIV_NET_SETIFDESCR: 3670 case PRIV_NET_SETIFNAME : 3671 case PRIV_NET_SETIFMETRIC: 3672 case PRIV_NET_SETIFPHYS: 3673 case PRIV_NET_SETIFMAC: 3674 case PRIV_NET_ADDMULTI: 3675 case PRIV_NET_DELMULTI: 3676 case PRIV_NET_HWIOCTL: 3677 case PRIV_NET_SETLLADDR: 3678 case PRIV_NET_ADDIFGROUP: 3679 case PRIV_NET_DELIFGROUP: 3680 case PRIV_NET_IFCREATE: 3681 case PRIV_NET_IFDESTROY: 3682 case PRIV_NET_ADDIFADDR: 3683 case PRIV_NET_DELIFADDR: 3684 case PRIV_NET_LAGG: 3685 case PRIV_NET_GIF: 3686 case PRIV_NET_SETIFVNET: 3687 case PRIV_NET_SETIFFIB: 3688 3689 /* 3690 * 802.11-related privileges. 3691 */ 3692 case PRIV_NET80211_GETKEY: 3693 #ifdef notyet 3694 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3695 #endif 3696 3697 #ifdef notyet 3698 /* 3699 * AppleTalk privileges. 3700 */ 3701 case PRIV_NETATALK_RESERVEDPORT: 3702 3703 /* 3704 * ATM privileges. 3705 */ 3706 case PRIV_NETATM_CFG: 3707 case PRIV_NETATM_ADD: 3708 case PRIV_NETATM_DEL: 3709 case PRIV_NETATM_SET: 3710 3711 /* 3712 * Bluetooth privileges. 3713 */ 3714 case PRIV_NETBLUETOOTH_RAW: 3715 #endif 3716 3717 /* 3718 * Netgraph and netgraph module privileges. 3719 */ 3720 case PRIV_NETGRAPH_CONTROL: 3721 #ifdef notyet 3722 case PRIV_NETGRAPH_TTY: 3723 #endif 3724 3725 /* 3726 * IPv4 and IPv6 privileges. 3727 */ 3728 case PRIV_NETINET_IPFW: 3729 case PRIV_NETINET_DIVERT: 3730 case PRIV_NETINET_PF: 3731 case PRIV_NETINET_DUMMYNET: 3732 case PRIV_NETINET_CARP: 3733 case PRIV_NETINET_MROUTE: 3734 case PRIV_NETINET_RAW: 3735 case PRIV_NETINET_ADDRCTRL6: 3736 case PRIV_NETINET_ND6: 3737 case PRIV_NETINET_SCOPE6: 3738 case PRIV_NETINET_ALIFETIME6: 3739 case PRIV_NETINET_IPSEC: 3740 case PRIV_NETINET_BINDANY: 3741 3742 #ifdef notyet 3743 /* 3744 * IPX/SPX privileges. 3745 */ 3746 case PRIV_NETIPX_RESERVEDPORT: 3747 case PRIV_NETIPX_RAW: 3748 3749 /* 3750 * NCP privileges. 3751 */ 3752 case PRIV_NETNCP: 3753 3754 /* 3755 * SMB privileges. 3756 */ 3757 case PRIV_NETSMB: 3758 #endif 3759 3760 /* 3761 * No default: or deny here. 3762 * In case of no permit fall through to next switch(). 3763 */ 3764 if (cred->cr_prison->pr_flags & PR_VNET) 3765 return (0); 3766 } 3767 #endif /* VIMAGE */ 3768 3769 switch (priv) { 3770 3771 /* 3772 * Allow ktrace privileges for root in jail. 3773 */ 3774 case PRIV_KTRACE: 3775 3776 #if 0 3777 /* 3778 * Allow jailed processes to configure audit identity and 3779 * submit audit records (login, etc). In the future we may 3780 * want to further refine the relationship between audit and 3781 * jail. 3782 */ 3783 case PRIV_AUDIT_GETAUDIT: 3784 case PRIV_AUDIT_SETAUDIT: 3785 case PRIV_AUDIT_SUBMIT: 3786 #endif 3787 3788 /* 3789 * Allow jailed processes to manipulate process UNIX 3790 * credentials in any way they see fit. 3791 */ 3792 case PRIV_CRED_SETUID: 3793 case PRIV_CRED_SETEUID: 3794 case PRIV_CRED_SETGID: 3795 case PRIV_CRED_SETEGID: 3796 case PRIV_CRED_SETGROUPS: 3797 case PRIV_CRED_SETREUID: 3798 case PRIV_CRED_SETREGID: 3799 case PRIV_CRED_SETRESUID: 3800 case PRIV_CRED_SETRESGID: 3801 3802 /* 3803 * Jail implements visibility constraints already, so allow 3804 * jailed root to override uid/gid-based constraints. 3805 */ 3806 case PRIV_SEEOTHERGIDS: 3807 case PRIV_SEEOTHERUIDS: 3808 3809 /* 3810 * Jail implements inter-process debugging limits already, so 3811 * allow jailed root various debugging privileges. 3812 */ 3813 case PRIV_DEBUG_DIFFCRED: 3814 case PRIV_DEBUG_SUGID: 3815 case PRIV_DEBUG_UNPRIV: 3816 3817 /* 3818 * Allow jail to set various resource limits and login 3819 * properties, and for now, exceed process resource limits. 3820 */ 3821 case PRIV_PROC_LIMIT: 3822 case PRIV_PROC_SETLOGIN: 3823 case PRIV_PROC_SETRLIMIT: 3824 3825 /* 3826 * System V and POSIX IPC privileges are granted in jail. 3827 */ 3828 case PRIV_IPC_READ: 3829 case PRIV_IPC_WRITE: 3830 case PRIV_IPC_ADMIN: 3831 case PRIV_IPC_MSGSIZE: 3832 case PRIV_MQ_ADMIN: 3833 3834 /* 3835 * Jail operations within a jail work on child jails. 3836 */ 3837 case PRIV_JAIL_ATTACH: 3838 case PRIV_JAIL_SET: 3839 case PRIV_JAIL_REMOVE: 3840 3841 /* 3842 * Jail implements its own inter-process limits, so allow 3843 * root processes in jail to change scheduling on other 3844 * processes in the same jail. Likewise for signalling. 3845 */ 3846 case PRIV_SCHED_DIFFCRED: 3847 case PRIV_SCHED_CPUSET: 3848 case PRIV_SIGNAL_DIFFCRED: 3849 case PRIV_SIGNAL_SUGID: 3850 3851 /* 3852 * Allow jailed processes to write to sysctls marked as jail 3853 * writable. 3854 */ 3855 case PRIV_SYSCTL_WRITEJAIL: 3856 3857 /* 3858 * Allow root in jail to manage a variety of quota 3859 * properties. These should likely be conditional on a 3860 * configuration option. 3861 */ 3862 case PRIV_VFS_GETQUOTA: 3863 case PRIV_VFS_SETQUOTA: 3864 3865 /* 3866 * Since Jail relies on chroot() to implement file system 3867 * protections, grant many VFS privileges to root in jail. 3868 * Be careful to exclude mount-related and NFS-related 3869 * privileges. 3870 */ 3871 case PRIV_VFS_READ: 3872 case PRIV_VFS_WRITE: 3873 case PRIV_VFS_ADMIN: 3874 case PRIV_VFS_EXEC: 3875 case PRIV_VFS_LOOKUP: 3876 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3877 case PRIV_VFS_CHFLAGS_DEV: 3878 case PRIV_VFS_CHOWN: 3879 case PRIV_VFS_CHROOT: 3880 case PRIV_VFS_RETAINSUGID: 3881 case PRIV_VFS_FCHROOT: 3882 case PRIV_VFS_LINK: 3883 case PRIV_VFS_SETGID: 3884 case PRIV_VFS_STAT: 3885 case PRIV_VFS_STICKYFILE: 3886 return (0); 3887 3888 /* 3889 * Depending on the global setting, allow privilege of 3890 * setting system flags. 3891 */ 3892 case PRIV_VFS_SYSFLAGS: 3893 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3894 return (0); 3895 else 3896 return (EPERM); 3897 3898 /* 3899 * Depending on the global setting, allow privilege of 3900 * mounting/unmounting file systems. 3901 */ 3902 case PRIV_VFS_MOUNT: 3903 case PRIV_VFS_UNMOUNT: 3904 case PRIV_VFS_MOUNT_NONUSER: 3905 case PRIV_VFS_MOUNT_OWNER: 3906 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3907 cred->cr_prison->pr_enforce_statfs < 2) 3908 return (0); 3909 else 3910 return (EPERM); 3911 3912 /* 3913 * Allow jailed root to bind reserved ports and reuse in-use 3914 * ports. 3915 */ 3916 case PRIV_NETINET_RESERVEDPORT: 3917 case PRIV_NETINET_REUSEPORT: 3918 return (0); 3919 3920 /* 3921 * Allow jailed root to set certian IPv4/6 (option) headers. 3922 */ 3923 case PRIV_NETINET_SETHDROPTS: 3924 return (0); 3925 3926 /* 3927 * Conditionally allow creating raw sockets in jail. 3928 */ 3929 case PRIV_NETINET_RAW: 3930 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3931 return (0); 3932 else 3933 return (EPERM); 3934 3935 /* 3936 * Since jail implements its own visibility limits on netstat 3937 * sysctls, allow getcred. This allows identd to work in 3938 * jail. 3939 */ 3940 case PRIV_NETINET_GETCRED: 3941 return (0); 3942 3943 /* 3944 * Allow jailed root to set loginclass. 3945 */ 3946 case PRIV_PROC_SETLOGINCLASS: 3947 return (0); 3948 3949 default: 3950 /* 3951 * In all remaining cases, deny the privilege request. This 3952 * includes almost all network privileges, many system 3953 * configuration privileges. 3954 */ 3955 return (EPERM); 3956 } 3957 } 3958 3959 /* 3960 * Return the part of pr2's name that is relative to pr1, or the whole name 3961 * if it does not directly follow. 3962 */ 3963 3964 char * 3965 prison_name(struct prison *pr1, struct prison *pr2) 3966 { 3967 char *name; 3968 3969 /* Jails see themselves as "0" (if they see themselves at all). */ 3970 if (pr1 == pr2) 3971 return "0"; 3972 name = pr2->pr_name; 3973 if (prison_ischild(pr1, pr2)) { 3974 /* 3975 * pr1 isn't locked (and allprison_lock may not be either) 3976 * so its length can't be counted on. But the number of dots 3977 * can be counted on - and counted. 3978 */ 3979 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3980 name = strchr(name, '.') + 1; 3981 } 3982 return (name); 3983 } 3984 3985 /* 3986 * Return the part of pr2's path that is relative to pr1, or the whole path 3987 * if it does not directly follow. 3988 */ 3989 static char * 3990 prison_path(struct prison *pr1, struct prison *pr2) 3991 { 3992 char *path1, *path2; 3993 int len1; 3994 3995 path1 = pr1->pr_path; 3996 path2 = pr2->pr_path; 3997 if (!strcmp(path1, "/")) 3998 return (path2); 3999 len1 = strlen(path1); 4000 if (strncmp(path1, path2, len1)) 4001 return (path2); 4002 if (path2[len1] == '\0') 4003 return "/"; 4004 if (path2[len1] == '/') 4005 return (path2 + len1); 4006 return (path2); 4007 } 4008 4009 4010 /* 4011 * Jail-related sysctls. 4012 */ 4013 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 4014 "Jails"); 4015 4016 static int 4017 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4018 { 4019 struct xprison *xp; 4020 struct prison *pr, *cpr; 4021 #ifdef INET 4022 struct in_addr *ip4 = NULL; 4023 int ip4s = 0; 4024 #endif 4025 #ifdef INET6 4026 struct in6_addr *ip6 = NULL; 4027 int ip6s = 0; 4028 #endif 4029 int descend, error; 4030 4031 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4032 pr = req->td->td_ucred->cr_prison; 4033 error = 0; 4034 sx_slock(&allprison_lock); 4035 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4036 #if defined(INET) || defined(INET6) 4037 again: 4038 #endif 4039 mtx_lock(&cpr->pr_mtx); 4040 #ifdef INET 4041 if (cpr->pr_ip4s > 0) { 4042 if (ip4s < cpr->pr_ip4s) { 4043 ip4s = cpr->pr_ip4s; 4044 mtx_unlock(&cpr->pr_mtx); 4045 ip4 = realloc(ip4, ip4s * 4046 sizeof(struct in_addr), M_TEMP, M_WAITOK); 4047 goto again; 4048 } 4049 bcopy(cpr->pr_ip4, ip4, 4050 cpr->pr_ip4s * sizeof(struct in_addr)); 4051 } 4052 #endif 4053 #ifdef INET6 4054 if (cpr->pr_ip6s > 0) { 4055 if (ip6s < cpr->pr_ip6s) { 4056 ip6s = cpr->pr_ip6s; 4057 mtx_unlock(&cpr->pr_mtx); 4058 ip6 = realloc(ip6, ip6s * 4059 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 4060 goto again; 4061 } 4062 bcopy(cpr->pr_ip6, ip6, 4063 cpr->pr_ip6s * sizeof(struct in6_addr)); 4064 } 4065 #endif 4066 if (cpr->pr_ref == 0) { 4067 mtx_unlock(&cpr->pr_mtx); 4068 continue; 4069 } 4070 bzero(xp, sizeof(*xp)); 4071 xp->pr_version = XPRISON_VERSION; 4072 xp->pr_id = cpr->pr_id; 4073 xp->pr_state = cpr->pr_uref > 0 4074 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4075 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4076 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4077 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4078 #ifdef INET 4079 xp->pr_ip4s = cpr->pr_ip4s; 4080 #endif 4081 #ifdef INET6 4082 xp->pr_ip6s = cpr->pr_ip6s; 4083 #endif 4084 mtx_unlock(&cpr->pr_mtx); 4085 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4086 if (error) 4087 break; 4088 #ifdef INET 4089 if (xp->pr_ip4s > 0) { 4090 error = SYSCTL_OUT(req, ip4, 4091 xp->pr_ip4s * sizeof(struct in_addr)); 4092 if (error) 4093 break; 4094 } 4095 #endif 4096 #ifdef INET6 4097 if (xp->pr_ip6s > 0) { 4098 error = SYSCTL_OUT(req, ip6, 4099 xp->pr_ip6s * sizeof(struct in6_addr)); 4100 if (error) 4101 break; 4102 } 4103 #endif 4104 } 4105 sx_sunlock(&allprison_lock); 4106 free(xp, M_TEMP); 4107 #ifdef INET 4108 free(ip4, M_TEMP); 4109 #endif 4110 #ifdef INET6 4111 free(ip6, M_TEMP); 4112 #endif 4113 return (error); 4114 } 4115 4116 SYSCTL_OID(_security_jail, OID_AUTO, list, 4117 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4118 sysctl_jail_list, "S", "List of active jails"); 4119 4120 static int 4121 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4122 { 4123 int error, injail; 4124 4125 injail = jailed(req->td->td_ucred); 4126 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4127 4128 return (error); 4129 } 4130 4131 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4132 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4133 sysctl_jail_jailed, "I", "Process in jail?"); 4134 4135 static int 4136 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4137 { 4138 int error, havevnet; 4139 #ifdef VIMAGE 4140 struct ucred *cred = req->td->td_ucred; 4141 4142 havevnet = jailed(cred) && prison_owns_vnet(cred); 4143 #else 4144 havevnet = 0; 4145 #endif 4146 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4147 4148 return (error); 4149 } 4150 4151 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4152 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4153 sysctl_jail_vnet, "I", "Jail owns VNET?"); 4154 4155 #if defined(INET) || defined(INET6) 4156 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4157 &jail_max_af_ips, 0, 4158 "Number of IP addresses a jail may have at most per address family"); 4159 #endif 4160 4161 /* 4162 * Default parameters for jail(2) compatability. For historical reasons, 4163 * the sysctl names have varying similarity to the parameter names. Prisons 4164 * just see their own parameters, and can't change them. 4165 */ 4166 static int 4167 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4168 { 4169 struct prison *pr; 4170 int allow, error, i; 4171 4172 pr = req->td->td_ucred->cr_prison; 4173 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4174 4175 /* Get the current flag value, and convert it to a boolean. */ 4176 i = (allow & arg2) ? 1 : 0; 4177 if (arg1 != NULL) 4178 i = !i; 4179 error = sysctl_handle_int(oidp, &i, 0, req); 4180 if (error || !req->newptr) 4181 return (error); 4182 i = i ? arg2 : 0; 4183 if (arg1 != NULL) 4184 i ^= arg2; 4185 /* 4186 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4187 * for writing. 4188 */ 4189 mtx_lock(&prison0.pr_mtx); 4190 jail_default_allow = (jail_default_allow & ~arg2) | i; 4191 mtx_unlock(&prison0.pr_mtx); 4192 return (0); 4193 } 4194 4195 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4196 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4197 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4198 "Processes in jail can set their hostnames"); 4199 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4200 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4201 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4202 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 4203 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4204 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4205 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4206 "Processes in jail can use System V IPC primitives"); 4207 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4208 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4209 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4210 "Prison root can create raw sockets"); 4211 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4212 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4213 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4214 "Processes in jail can alter system file flags"); 4215 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4216 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4217 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4218 "Processes in jail can mount/unmount jail-friendly file systems"); 4219 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 4220 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4221 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 4222 "Processes in jail can mount the devfs file system"); 4223 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 4224 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4225 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 4226 "Processes in jail can mount the nullfs file system"); 4227 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 4228 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4229 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 4230 "Processes in jail can mount the procfs file system"); 4231 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 4232 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4233 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 4234 "Processes in jail can mount the zfs file system"); 4235 4236 static int 4237 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4238 { 4239 struct prison *pr; 4240 int level, error; 4241 4242 pr = req->td->td_ucred->cr_prison; 4243 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4244 error = sysctl_handle_int(oidp, &level, 0, req); 4245 if (error || !req->newptr) 4246 return (error); 4247 *(int *)arg1 = level; 4248 return (0); 4249 } 4250 4251 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4252 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4253 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4254 sysctl_jail_default_level, "I", 4255 "Processes in jail cannot see all mounted file systems"); 4256 4257 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4258 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4259 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4260 sysctl_jail_default_level, "I", 4261 "Ruleset for the devfs filesystem in jail"); 4262 4263 /* 4264 * Nodes to describe jail parameters. Maximum length of string parameters 4265 * is returned in the string itself, and the other parameters exist merely 4266 * to make themselves and their types known. 4267 */ 4268 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4269 "Jail parameters"); 4270 4271 int 4272 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4273 { 4274 int i; 4275 long l; 4276 size_t s; 4277 char numbuf[12]; 4278 4279 switch (oidp->oid_kind & CTLTYPE) 4280 { 4281 case CTLTYPE_LONG: 4282 case CTLTYPE_ULONG: 4283 l = 0; 4284 #ifdef SCTL_MASK32 4285 if (!(req->flags & SCTL_MASK32)) 4286 #endif 4287 return (SYSCTL_OUT(req, &l, sizeof(l))); 4288 case CTLTYPE_INT: 4289 case CTLTYPE_UINT: 4290 i = 0; 4291 return (SYSCTL_OUT(req, &i, sizeof(i))); 4292 case CTLTYPE_STRING: 4293 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4294 return 4295 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4296 case CTLTYPE_STRUCT: 4297 s = (size_t)arg2; 4298 return (SYSCTL_OUT(req, &s, sizeof(s))); 4299 } 4300 return (0); 4301 } 4302 4303 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4304 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4305 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4306 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4307 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4308 "I", "Jail secure level"); 4309 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4310 "I", "Jail cannot see all mounted file systems"); 4311 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4312 "I", "Ruleset for in-jail devfs mounts"); 4313 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4314 "B", "Jail persistence"); 4315 #ifdef VIMAGE 4316 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4317 "E,jailsys", "Virtual network stack"); 4318 #endif 4319 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4320 "B", "Jail is in the process of shutting down"); 4321 4322 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4323 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4324 "I", "Current number of child jails"); 4325 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4326 "I", "Maximum number of child jails"); 4327 4328 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4329 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4330 "Jail hostname"); 4331 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4332 "Jail NIS domainname"); 4333 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4334 "Jail host UUID"); 4335 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4336 "LU", "Jail host ID"); 4337 4338 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4339 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4340 4341 #ifdef INET 4342 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4343 "Jail IPv4 address virtualization"); 4344 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4345 "S,in_addr,a", "Jail IPv4 addresses"); 4346 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4347 "B", "Do (not) use IPv4 source address selection rather than the " 4348 "primary jail IPv4 address."); 4349 #endif 4350 #ifdef INET6 4351 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4352 "Jail IPv6 address virtualization"); 4353 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4354 "S,in6_addr,a", "Jail IPv6 addresses"); 4355 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4356 "B", "Do (not) use IPv6 source address selection rather than the " 4357 "primary jail IPv6 address."); 4358 #endif 4359 4360 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4361 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4362 "B", "Jail may set hostname"); 4363 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4364 "B", "Jail may use SYSV IPC"); 4365 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4366 "B", "Jail may create raw sockets"); 4367 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4368 "B", "Jail may alter system file flags"); 4369 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4370 "B", "Jail may set file quotas"); 4371 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4372 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4373 4374 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4375 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4376 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4377 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 4378 "B", "Jail may mount the devfs file system"); 4379 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 4380 "B", "Jail may mount the nullfs file system"); 4381 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 4382 "B", "Jail may mount the procfs file system"); 4383 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 4384 "B", "Jail may mount the zfs file system"); 4385 4386 void 4387 prison_racct_foreach(void (*callback)(struct racct *racct, 4388 void *arg2, void *arg3), void *arg2, void *arg3) 4389 { 4390 struct prison_racct *prr; 4391 4392 sx_slock(&allprison_lock); 4393 LIST_FOREACH(prr, &allprison_racct, prr_next) 4394 (callback)(prr->prr_racct, arg2, arg3); 4395 sx_sunlock(&allprison_lock); 4396 } 4397 4398 static struct prison_racct * 4399 prison_racct_find_locked(const char *name) 4400 { 4401 struct prison_racct *prr; 4402 4403 sx_assert(&allprison_lock, SA_XLOCKED); 4404 4405 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4406 return (NULL); 4407 4408 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4409 if (strcmp(name, prr->prr_name) != 0) 4410 continue; 4411 4412 /* Found prison_racct with a matching name? */ 4413 prison_racct_hold(prr); 4414 return (prr); 4415 } 4416 4417 /* Add new prison_racct. */ 4418 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4419 racct_create(&prr->prr_racct); 4420 4421 strcpy(prr->prr_name, name); 4422 refcount_init(&prr->prr_refcount, 1); 4423 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4424 4425 return (prr); 4426 } 4427 4428 struct prison_racct * 4429 prison_racct_find(const char *name) 4430 { 4431 struct prison_racct *prr; 4432 4433 sx_xlock(&allprison_lock); 4434 prr = prison_racct_find_locked(name); 4435 sx_xunlock(&allprison_lock); 4436 return (prr); 4437 } 4438 4439 void 4440 prison_racct_hold(struct prison_racct *prr) 4441 { 4442 4443 refcount_acquire(&prr->prr_refcount); 4444 } 4445 4446 static void 4447 prison_racct_free_locked(struct prison_racct *prr) 4448 { 4449 4450 sx_assert(&allprison_lock, SA_XLOCKED); 4451 4452 if (refcount_release(&prr->prr_refcount)) { 4453 racct_destroy(&prr->prr_racct); 4454 LIST_REMOVE(prr, prr_next); 4455 free(prr, M_PRISON_RACCT); 4456 } 4457 } 4458 4459 void 4460 prison_racct_free(struct prison_racct *prr) 4461 { 4462 int old; 4463 4464 sx_assert(&allprison_lock, SA_UNLOCKED); 4465 4466 old = prr->prr_refcount; 4467 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4468 return; 4469 4470 sx_xlock(&allprison_lock); 4471 prison_racct_free_locked(prr); 4472 sx_xunlock(&allprison_lock); 4473 } 4474 4475 #ifdef RACCT 4476 static void 4477 prison_racct_attach(struct prison *pr) 4478 { 4479 struct prison_racct *prr; 4480 4481 sx_assert(&allprison_lock, SA_XLOCKED); 4482 4483 prr = prison_racct_find_locked(pr->pr_name); 4484 KASSERT(prr != NULL, ("cannot find prison_racct")); 4485 4486 pr->pr_prison_racct = prr; 4487 } 4488 4489 /* 4490 * Handle jail renaming. From the racct point of view, renaming means 4491 * moving from one prison_racct to another. 4492 */ 4493 static void 4494 prison_racct_modify(struct prison *pr) 4495 { 4496 struct proc *p; 4497 struct ucred *cred; 4498 struct prison_racct *oldprr; 4499 4500 sx_slock(&allproc_lock); 4501 sx_xlock(&allprison_lock); 4502 4503 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4504 sx_xunlock(&allprison_lock); 4505 sx_sunlock(&allproc_lock); 4506 return; 4507 } 4508 4509 oldprr = pr->pr_prison_racct; 4510 pr->pr_prison_racct = NULL; 4511 4512 prison_racct_attach(pr); 4513 4514 /* 4515 * Move resource utilisation records. 4516 */ 4517 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4518 4519 /* 4520 * Force rctl to reattach rules to processes. 4521 */ 4522 FOREACH_PROC_IN_SYSTEM(p) { 4523 PROC_LOCK(p); 4524 cred = crhold(p->p_ucred); 4525 PROC_UNLOCK(p); 4526 racct_proc_ucred_changed(p, cred, cred); 4527 crfree(cred); 4528 } 4529 4530 sx_sunlock(&allproc_lock); 4531 prison_racct_free_locked(oldprr); 4532 sx_xunlock(&allprison_lock); 4533 } 4534 4535 static void 4536 prison_racct_detach(struct prison *pr) 4537 { 4538 4539 sx_assert(&allprison_lock, SA_UNLOCKED); 4540 4541 if (pr->pr_prison_racct == NULL) 4542 return; 4543 prison_racct_free(pr->pr_prison_racct); 4544 pr->pr_prison_racct = NULL; 4545 } 4546 #endif /* RACCT */ 4547 4548 #ifdef DDB 4549 4550 static void 4551 db_show_prison(struct prison *pr) 4552 { 4553 int fi; 4554 #if defined(INET) || defined(INET6) 4555 int ii; 4556 #endif 4557 unsigned jsf; 4558 #ifdef INET6 4559 char ip6buf[INET6_ADDRSTRLEN]; 4560 #endif 4561 4562 db_printf("prison %p:\n", pr); 4563 db_printf(" jid = %d\n", pr->pr_id); 4564 db_printf(" name = %s\n", pr->pr_name); 4565 db_printf(" parent = %p\n", pr->pr_parent); 4566 db_printf(" ref = %d\n", pr->pr_ref); 4567 db_printf(" uref = %d\n", pr->pr_uref); 4568 db_printf(" path = %s\n", pr->pr_path); 4569 db_printf(" cpuset = %d\n", pr->pr_cpuset 4570 ? pr->pr_cpuset->cs_id : -1); 4571 #ifdef VIMAGE 4572 db_printf(" vnet = %p\n", pr->pr_vnet); 4573 #endif 4574 db_printf(" root = %p\n", pr->pr_root); 4575 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4576 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4577 db_printf(" children.max = %d\n", pr->pr_childmax); 4578 db_printf(" children.cur = %d\n", pr->pr_childcount); 4579 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4580 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4581 db_printf(" flags = 0x%x", pr->pr_flags); 4582 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4583 fi++) 4584 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4585 db_printf(" %s", pr_flag_names[fi]); 4586 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4587 fi++) { 4588 jsf = pr->pr_flags & 4589 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4590 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4591 pr_flag_jailsys[fi].disable && 4592 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4593 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4594 : "inherit"); 4595 } 4596 db_printf(" allow = 0x%x", pr->pr_allow); 4597 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4598 fi++) 4599 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4600 db_printf(" %s", pr_allow_names[fi]); 4601 db_printf("\n"); 4602 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4603 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4604 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4605 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4606 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4607 #ifdef INET 4608 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4609 for (ii = 0; ii < pr->pr_ip4s; ii++) 4610 db_printf(" %s %s\n", 4611 ii == 0 ? "ip4.addr =" : " ", 4612 inet_ntoa(pr->pr_ip4[ii])); 4613 #endif 4614 #ifdef INET6 4615 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4616 for (ii = 0; ii < pr->pr_ip6s; ii++) 4617 db_printf(" %s %s\n", 4618 ii == 0 ? "ip6.addr =" : " ", 4619 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4620 #endif 4621 } 4622 4623 DB_SHOW_COMMAND(prison, db_show_prison_command) 4624 { 4625 struct prison *pr; 4626 4627 if (!have_addr) { 4628 /* 4629 * Show all prisons in the list, and prison0 which is not 4630 * listed. 4631 */ 4632 db_show_prison(&prison0); 4633 if (!db_pager_quit) { 4634 TAILQ_FOREACH(pr, &allprison, pr_list) { 4635 db_show_prison(pr); 4636 if (db_pager_quit) 4637 break; 4638 } 4639 } 4640 return; 4641 } 4642 4643 if (addr == 0) 4644 pr = &prison0; 4645 else { 4646 /* Look for a prison with the ID and with references. */ 4647 TAILQ_FOREACH(pr, &allprison, pr_list) 4648 if (pr->pr_id == addr && pr->pr_ref > 0) 4649 break; 4650 if (pr == NULL) 4651 /* Look again, without requiring a reference. */ 4652 TAILQ_FOREACH(pr, &allprison, pr_list) 4653 if (pr->pr_id == addr) 4654 break; 4655 if (pr == NULL) 4656 /* Assume address points to a valid prison. */ 4657 pr = (struct prison *)addr; 4658 } 4659 db_show_prison(pr); 4660 } 4661 4662 #endif /* DDB */ 4663