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/if_var.h> 66 #include <net/vnet.h> 67 68 #include <netinet/in.h> 69 70 #ifdef DDB 71 #include <ddb/ddb.h> 72 #ifdef INET6 73 #include <netinet6/in6_var.h> 74 #endif /* INET6 */ 75 #endif /* DDB */ 76 77 #include <security/mac/mac_framework.h> 78 79 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 80 81 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 82 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 83 84 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 85 #ifdef INET 86 #ifdef INET6 87 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 88 #else 89 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 90 #endif 91 #else /* !INET */ 92 #ifdef INET6 93 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 94 #else 95 #define _PR_IP_SADDRSEL 0 96 #endif 97 #endif 98 99 /* prison0 describes what is "real" about the system. */ 100 struct prison prison0 = { 101 .pr_id = 0, 102 .pr_name = "0", 103 .pr_ref = 1, 104 .pr_uref = 1, 105 .pr_path = "/", 106 .pr_securelevel = -1, 107 .pr_devfs_rsnum = 0, 108 .pr_childmax = JAIL_MAX, 109 .pr_hostuuid = DEFAULT_HOSTUUID, 110 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 111 #ifdef VIMAGE 112 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 113 #else 114 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 115 #endif 116 .pr_allow = PR_ALLOW_ALL, 117 }; 118 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 119 120 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 121 struct sx allprison_lock; 122 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 123 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 124 LIST_HEAD(, prison_racct) allprison_racct; 125 int lastprid = 0; 126 127 static int do_jail_attach(struct thread *td, struct prison *pr); 128 static void prison_complete(void *context, int pending); 129 static void prison_deref(struct prison *pr, int flags); 130 static char *prison_path(struct prison *pr1, struct prison *pr2); 131 static void prison_remove_one(struct prison *pr); 132 #ifdef RACCT 133 static void prison_racct_attach(struct prison *pr); 134 static void prison_racct_modify(struct prison *pr); 135 static void prison_racct_detach(struct prison *pr); 136 #endif 137 #ifdef INET 138 static int _prison_check_ip4(const struct prison *, const struct in_addr *); 139 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4); 140 #endif 141 #ifdef INET6 142 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6); 143 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6); 144 #endif 145 146 /* Flags for prison_deref */ 147 #define PD_DEREF 0x01 148 #define PD_DEUREF 0x02 149 #define PD_LOCKED 0x04 150 #define PD_LIST_SLOCKED 0x08 151 #define PD_LIST_XLOCKED 0x10 152 153 /* 154 * Parameter names corresponding to PR_* flag values. Size values are for kvm 155 * as we cannot figure out the size of a sparse array, or an array without a 156 * terminating entry. 157 */ 158 static char *pr_flag_names[] = { 159 [0] = "persist", 160 #ifdef INET 161 [7] = "ip4.saddrsel", 162 #endif 163 #ifdef INET6 164 [8] = "ip6.saddrsel", 165 #endif 166 }; 167 const size_t pr_flag_names_size = sizeof(pr_flag_names); 168 169 static char *pr_flag_nonames[] = { 170 [0] = "nopersist", 171 #ifdef INET 172 [7] = "ip4.nosaddrsel", 173 #endif 174 #ifdef INET6 175 [8] = "ip6.nosaddrsel", 176 #endif 177 }; 178 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames); 179 180 struct jailsys_flags { 181 const char *name; 182 unsigned disable; 183 unsigned new; 184 } pr_flag_jailsys[] = { 185 { "host", 0, PR_HOST }, 186 #ifdef VIMAGE 187 { "vnet", 0, PR_VNET }, 188 #endif 189 #ifdef INET 190 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER }, 191 #endif 192 #ifdef INET6 193 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER }, 194 #endif 195 }; 196 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 197 198 static char *pr_allow_names[] = { 199 "allow.set_hostname", 200 "allow.sysvipc", 201 "allow.raw_sockets", 202 "allow.chflags", 203 "allow.mount", 204 "allow.quotas", 205 "allow.socket_af", 206 "allow.mount.devfs", 207 "allow.mount.nullfs", 208 "allow.mount.zfs", 209 "allow.mount.procfs", 210 "allow.mount.tmpfs", 211 "allow.kmem", 212 }; 213 const size_t pr_allow_names_size = sizeof(pr_allow_names); 214 215 static char *pr_allow_nonames[] = { 216 "allow.noset_hostname", 217 "allow.nosysvipc", 218 "allow.noraw_sockets", 219 "allow.nochflags", 220 "allow.nomount", 221 "allow.noquotas", 222 "allow.nosocket_af", 223 "allow.mount.nodevfs", 224 "allow.mount.nonullfs", 225 "allow.mount.nozfs", 226 "allow.mount.noprocfs", 227 "allow.mount.notmpfs", 228 "allow.nokmem", 229 }; 230 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames); 231 232 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 233 #define JAIL_DEFAULT_ENFORCE_STATFS 2 234 #define JAIL_DEFAULT_DEVFS_RSNUM 0 235 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 236 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 237 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 238 #if defined(INET) || defined(INET6) 239 static unsigned jail_max_af_ips = 255; 240 #endif 241 242 #ifdef INET 243 static int 244 qcmp_v4(const void *ip1, const void *ip2) 245 { 246 in_addr_t iaa, iab; 247 248 /* 249 * We need to compare in HBO here to get the list sorted as expected 250 * by the result of the code. Sorting NBO addresses gives you 251 * interesting results. If you do not understand, do not try. 252 */ 253 iaa = ntohl(((const struct in_addr *)ip1)->s_addr); 254 iab = ntohl(((const struct in_addr *)ip2)->s_addr); 255 256 /* 257 * Do not simply return the difference of the two numbers, the int is 258 * not wide enough. 259 */ 260 if (iaa > iab) 261 return (1); 262 else if (iaa < iab) 263 return (-1); 264 else 265 return (0); 266 } 267 #endif 268 269 #ifdef INET6 270 static int 271 qcmp_v6(const void *ip1, const void *ip2) 272 { 273 const struct in6_addr *ia6a, *ia6b; 274 int i, rc; 275 276 ia6a = (const struct in6_addr *)ip1; 277 ia6b = (const struct in6_addr *)ip2; 278 279 rc = 0; 280 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 281 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 282 rc = 1; 283 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 284 rc = -1; 285 } 286 return (rc); 287 } 288 #endif 289 290 /* 291 * struct jail_args { 292 * struct jail *jail; 293 * }; 294 */ 295 int 296 sys_jail(struct thread *td, struct jail_args *uap) 297 { 298 uint32_t version; 299 int error; 300 struct jail j; 301 302 error = copyin(uap->jail, &version, sizeof(uint32_t)); 303 if (error) 304 return (error); 305 306 switch (version) { 307 case 0: 308 { 309 struct jail_v0 j0; 310 311 /* FreeBSD single IPv4 jails. */ 312 bzero(&j, sizeof(struct jail)); 313 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 314 if (error) 315 return (error); 316 j.version = j0.version; 317 j.path = j0.path; 318 j.hostname = j0.hostname; 319 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 320 break; 321 } 322 323 case 1: 324 /* 325 * Version 1 was used by multi-IPv4 jail implementations 326 * that never made it into the official kernel. 327 */ 328 return (EINVAL); 329 330 case 2: /* JAIL_API_VERSION */ 331 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 332 error = copyin(uap->jail, &j, sizeof(struct jail)); 333 if (error) 334 return (error); 335 break; 336 337 default: 338 /* Sci-Fi jails are not supported, sorry. */ 339 return (EINVAL); 340 } 341 return (kern_jail(td, &j)); 342 } 343 344 int 345 kern_jail(struct thread *td, struct jail *j) 346 { 347 struct iovec optiov[2 * (4 348 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0]) 349 #ifdef INET 350 + 1 351 #endif 352 #ifdef INET6 353 + 1 354 #endif 355 )]; 356 struct uio opt; 357 char *u_path, *u_hostname, *u_name; 358 #ifdef INET 359 uint32_t ip4s; 360 struct in_addr *u_ip4; 361 #endif 362 #ifdef INET6 363 struct in6_addr *u_ip6; 364 #endif 365 size_t tmplen; 366 int error, enforce_statfs, fi; 367 368 bzero(&optiov, sizeof(optiov)); 369 opt.uio_iov = optiov; 370 opt.uio_iovcnt = 0; 371 opt.uio_offset = -1; 372 opt.uio_resid = -1; 373 opt.uio_segflg = UIO_SYSSPACE; 374 opt.uio_rw = UIO_READ; 375 opt.uio_td = td; 376 377 /* Set permissions for top-level jails from sysctls. */ 378 if (!jailed(td->td_ucred)) { 379 for (fi = 0; fi < sizeof(pr_allow_names) / 380 sizeof(pr_allow_names[0]); fi++) { 381 optiov[opt.uio_iovcnt].iov_base = 382 (jail_default_allow & (1 << fi)) 383 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 384 optiov[opt.uio_iovcnt].iov_len = 385 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 386 opt.uio_iovcnt += 2; 387 } 388 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 389 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 390 opt.uio_iovcnt++; 391 enforce_statfs = jail_default_enforce_statfs; 392 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 393 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 394 opt.uio_iovcnt++; 395 } 396 397 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 398 #ifdef INET 399 ip4s = (j->version == 0) ? 1 : j->ip4s; 400 if (ip4s > jail_max_af_ips) 401 return (EINVAL); 402 tmplen += ip4s * sizeof(struct in_addr); 403 #else 404 if (j->ip4s > 0) 405 return (EINVAL); 406 #endif 407 #ifdef INET6 408 if (j->ip6s > jail_max_af_ips) 409 return (EINVAL); 410 tmplen += j->ip6s * sizeof(struct in6_addr); 411 #else 412 if (j->ip6s > 0) 413 return (EINVAL); 414 #endif 415 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 416 u_hostname = u_path + MAXPATHLEN; 417 u_name = u_hostname + MAXHOSTNAMELEN; 418 #ifdef INET 419 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 420 #endif 421 #ifdef INET6 422 #ifdef INET 423 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 424 #else 425 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 426 #endif 427 #endif 428 optiov[opt.uio_iovcnt].iov_base = "path"; 429 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 430 opt.uio_iovcnt++; 431 optiov[opt.uio_iovcnt].iov_base = u_path; 432 error = copyinstr(j->path, u_path, MAXPATHLEN, 433 &optiov[opt.uio_iovcnt].iov_len); 434 if (error) { 435 free(u_path, M_TEMP); 436 return (error); 437 } 438 opt.uio_iovcnt++; 439 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 440 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 441 opt.uio_iovcnt++; 442 optiov[opt.uio_iovcnt].iov_base = u_hostname; 443 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 444 &optiov[opt.uio_iovcnt].iov_len); 445 if (error) { 446 free(u_path, M_TEMP); 447 return (error); 448 } 449 opt.uio_iovcnt++; 450 if (j->jailname != NULL) { 451 optiov[opt.uio_iovcnt].iov_base = "name"; 452 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 453 opt.uio_iovcnt++; 454 optiov[opt.uio_iovcnt].iov_base = u_name; 455 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 456 &optiov[opt.uio_iovcnt].iov_len); 457 if (error) { 458 free(u_path, M_TEMP); 459 return (error); 460 } 461 opt.uio_iovcnt++; 462 } 463 #ifdef INET 464 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 465 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 466 opt.uio_iovcnt++; 467 optiov[opt.uio_iovcnt].iov_base = u_ip4; 468 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 469 if (j->version == 0) 470 u_ip4->s_addr = j->ip4s; 471 else { 472 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 473 if (error) { 474 free(u_path, M_TEMP); 475 return (error); 476 } 477 } 478 opt.uio_iovcnt++; 479 #endif 480 #ifdef INET6 481 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 482 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 483 opt.uio_iovcnt++; 484 optiov[opt.uio_iovcnt].iov_base = u_ip6; 485 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 486 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 487 if (error) { 488 free(u_path, M_TEMP); 489 return (error); 490 } 491 opt.uio_iovcnt++; 492 #endif 493 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]), 494 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 495 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 496 free(u_path, M_TEMP); 497 return (error); 498 } 499 500 501 /* 502 * struct jail_set_args { 503 * struct iovec *iovp; 504 * unsigned int iovcnt; 505 * int flags; 506 * }; 507 */ 508 int 509 sys_jail_set(struct thread *td, struct jail_set_args *uap) 510 { 511 struct uio *auio; 512 int error; 513 514 /* Check that we have an even number of iovecs. */ 515 if (uap->iovcnt & 1) 516 return (EINVAL); 517 518 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 519 if (error) 520 return (error); 521 error = kern_jail_set(td, auio, uap->flags); 522 free(auio, M_IOV); 523 return (error); 524 } 525 526 int 527 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 528 { 529 struct nameidata nd; 530 #ifdef INET 531 struct in_addr *ip4; 532 #endif 533 #ifdef INET6 534 struct in6_addr *ip6; 535 #endif 536 struct vfsopt *opt; 537 struct vfsoptlist *opts; 538 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 539 struct vnode *root; 540 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 541 char *g_path; 542 #if defined(INET) || defined(INET6) 543 struct prison *tppr; 544 void *op; 545 #endif 546 unsigned long hid; 547 size_t namelen, onamelen; 548 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos; 549 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 550 int fi, jid, jsys, len, level; 551 int childmax, rsnum, slevel; 552 int fullpath_disabled; 553 #if defined(INET) || defined(INET6) 554 int ii, ij; 555 #endif 556 #ifdef INET 557 int ip4s, redo_ip4; 558 #endif 559 #ifdef INET6 560 int ip6s, redo_ip6; 561 #endif 562 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 563 unsigned tallow; 564 char numbuf[12]; 565 566 error = priv_check(td, PRIV_JAIL_SET); 567 if (!error && (flags & JAIL_ATTACH)) 568 error = priv_check(td, PRIV_JAIL_ATTACH); 569 if (error) 570 return (error); 571 mypr = ppr = td->td_ucred->cr_prison; 572 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 573 return (EPERM); 574 if (flags & ~JAIL_SET_MASK) 575 return (EINVAL); 576 577 /* 578 * Check all the parameters before committing to anything. Not all 579 * errors can be caught early, but we may as well try. Also, this 580 * takes care of some expensive stuff (path lookup) before getting 581 * the allprison lock. 582 * 583 * XXX Jails are not filesystems, and jail parameters are not mount 584 * options. But it makes more sense to re-use the vfsopt code 585 * than duplicate it under a different name. 586 */ 587 error = vfs_buildopts(optuio, &opts); 588 if (error) 589 return (error); 590 #ifdef INET 591 ip4 = NULL; 592 #endif 593 #ifdef INET6 594 ip6 = NULL; 595 #endif 596 g_path = NULL; 597 598 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 599 if (error == ENOENT) 600 jid = 0; 601 else if (error != 0) 602 goto done_free; 603 604 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 605 if (error == ENOENT) 606 gotslevel = 0; 607 else if (error != 0) 608 goto done_free; 609 else 610 gotslevel = 1; 611 612 error = 613 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 614 if (error == ENOENT) 615 gotchildmax = 0; 616 else if (error != 0) 617 goto done_free; 618 else 619 gotchildmax = 1; 620 621 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 622 if (error == ENOENT) 623 gotenforce = 0; 624 else if (error != 0) 625 goto done_free; 626 else if (enforce < 0 || enforce > 2) { 627 error = EINVAL; 628 goto done_free; 629 } else 630 gotenforce = 1; 631 632 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 633 if (error == ENOENT) 634 gotrsnum = 0; 635 else if (error != 0) 636 goto done_free; 637 else 638 gotrsnum = 1; 639 640 pr_flags = ch_flags = 0; 641 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 642 fi++) { 643 if (pr_flag_names[fi] == NULL) 644 continue; 645 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 646 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 647 } 648 ch_flags |= pr_flags; 649 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 650 fi++) { 651 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 652 sizeof(jsys)); 653 if (error == ENOENT) 654 continue; 655 if (error != 0) 656 goto done_free; 657 switch (jsys) { 658 case JAIL_SYS_DISABLE: 659 if (!pr_flag_jailsys[fi].disable) { 660 error = EINVAL; 661 goto done_free; 662 } 663 pr_flags |= pr_flag_jailsys[fi].disable; 664 break; 665 case JAIL_SYS_NEW: 666 pr_flags |= pr_flag_jailsys[fi].new; 667 break; 668 case JAIL_SYS_INHERIT: 669 break; 670 default: 671 error = EINVAL; 672 goto done_free; 673 } 674 ch_flags |= 675 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 676 } 677 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 678 && !(pr_flags & PR_PERSIST)) { 679 error = EINVAL; 680 vfs_opterror(opts, "new jail must persist or attach"); 681 goto done_errmsg; 682 } 683 #ifdef VIMAGE 684 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 685 error = EINVAL; 686 vfs_opterror(opts, "vnet cannot be changed after creation"); 687 goto done_errmsg; 688 } 689 #endif 690 #ifdef INET 691 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 692 error = EINVAL; 693 vfs_opterror(opts, "ip4 cannot be changed after creation"); 694 goto done_errmsg; 695 } 696 #endif 697 #ifdef INET6 698 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 699 error = EINVAL; 700 vfs_opterror(opts, "ip6 cannot be changed after creation"); 701 goto done_errmsg; 702 } 703 #endif 704 705 pr_allow = ch_allow = 0; 706 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 707 fi++) { 708 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 709 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 710 } 711 ch_allow |= pr_allow; 712 713 error = vfs_getopt(opts, "name", (void **)&name, &len); 714 if (error == ENOENT) 715 name = NULL; 716 else if (error != 0) 717 goto done_free; 718 else { 719 if (len == 0 || name[len - 1] != '\0') { 720 error = EINVAL; 721 goto done_free; 722 } 723 if (len > MAXHOSTNAMELEN) { 724 error = ENAMETOOLONG; 725 goto done_free; 726 } 727 } 728 729 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 730 if (error == ENOENT) 731 host = NULL; 732 else if (error != 0) 733 goto done_free; 734 else { 735 ch_flags |= PR_HOST; 736 pr_flags |= PR_HOST; 737 if (len == 0 || host[len - 1] != '\0') { 738 error = EINVAL; 739 goto done_free; 740 } 741 if (len > MAXHOSTNAMELEN) { 742 error = ENAMETOOLONG; 743 goto done_free; 744 } 745 } 746 747 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 748 if (error == ENOENT) 749 domain = NULL; 750 else if (error != 0) 751 goto done_free; 752 else { 753 ch_flags |= PR_HOST; 754 pr_flags |= PR_HOST; 755 if (len == 0 || domain[len - 1] != '\0') { 756 error = EINVAL; 757 goto done_free; 758 } 759 if (len > MAXHOSTNAMELEN) { 760 error = ENAMETOOLONG; 761 goto done_free; 762 } 763 } 764 765 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 766 if (error == ENOENT) 767 uuid = NULL; 768 else if (error != 0) 769 goto done_free; 770 else { 771 ch_flags |= PR_HOST; 772 pr_flags |= PR_HOST; 773 if (len == 0 || uuid[len - 1] != '\0') { 774 error = EINVAL; 775 goto done_free; 776 } 777 if (len > HOSTUUIDLEN) { 778 error = ENAMETOOLONG; 779 goto done_free; 780 } 781 } 782 783 #ifdef COMPAT_FREEBSD32 784 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 785 uint32_t hid32; 786 787 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 788 hid = hid32; 789 } else 790 #endif 791 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 792 if (error == ENOENT) 793 gothid = 0; 794 else if (error != 0) 795 goto done_free; 796 else { 797 gothid = 1; 798 ch_flags |= PR_HOST; 799 pr_flags |= PR_HOST; 800 } 801 802 #ifdef INET 803 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 804 if (error == ENOENT) 805 ip4s = (pr_flags & PR_IP4_DISABLE) ? 0 : -1; 806 else if (error != 0) 807 goto done_free; 808 else if (ip4s & (sizeof(*ip4) - 1)) { 809 error = EINVAL; 810 goto done_free; 811 } else { 812 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE; 813 if (ip4s == 0) 814 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE; 815 else { 816 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER; 817 ip4s /= sizeof(*ip4); 818 if (ip4s > jail_max_af_ips) { 819 error = EINVAL; 820 vfs_opterror(opts, "too many IPv4 addresses"); 821 goto done_errmsg; 822 } 823 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 824 bcopy(op, ip4, ip4s * sizeof(*ip4)); 825 /* 826 * IP addresses are all sorted but ip[0] to preserve 827 * the primary IP address as given from userland. 828 * This special IP is used for unbound outgoing 829 * connections as well for "loopback" traffic in case 830 * source address selection cannot find any more fitting 831 * address to connect from. 832 */ 833 if (ip4s > 1) 834 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4); 835 /* 836 * Check for duplicate addresses and do some simple 837 * zero and broadcast checks. If users give other bogus 838 * addresses it is their problem. 839 * 840 * We do not have to care about byte order for these 841 * checks so we will do them in NBO. 842 */ 843 for (ii = 0; ii < ip4s; ii++) { 844 if (ip4[ii].s_addr == INADDR_ANY || 845 ip4[ii].s_addr == INADDR_BROADCAST) { 846 error = EINVAL; 847 goto done_free; 848 } 849 if ((ii+1) < ip4s && 850 (ip4[0].s_addr == ip4[ii+1].s_addr || 851 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 852 error = EINVAL; 853 goto done_free; 854 } 855 } 856 } 857 } 858 #endif 859 860 #ifdef INET6 861 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 862 if (error == ENOENT) 863 ip6s = (pr_flags & PR_IP6_DISABLE) ? 0 : -1; 864 else if (error != 0) 865 goto done_free; 866 else if (ip6s & (sizeof(*ip6) - 1)) { 867 error = EINVAL; 868 goto done_free; 869 } else { 870 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE; 871 if (ip6s == 0) 872 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE; 873 else { 874 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER; 875 ip6s /= sizeof(*ip6); 876 if (ip6s > jail_max_af_ips) { 877 error = EINVAL; 878 vfs_opterror(opts, "too many IPv6 addresses"); 879 goto done_errmsg; 880 } 881 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 882 bcopy(op, ip6, ip6s * sizeof(*ip6)); 883 if (ip6s > 1) 884 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6); 885 for (ii = 0; ii < ip6s; ii++) { 886 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 887 error = EINVAL; 888 goto done_free; 889 } 890 if ((ii+1) < ip6s && 891 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 892 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 893 { 894 error = EINVAL; 895 goto done_free; 896 } 897 } 898 } 899 } 900 #endif 901 902 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 903 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 904 error = EINVAL; 905 vfs_opterror(opts, 906 "vnet jails cannot have IP address restrictions"); 907 goto done_errmsg; 908 } 909 #endif 910 911 fullpath_disabled = 0; 912 root = NULL; 913 error = vfs_getopt(opts, "path", (void **)&path, &len); 914 if (error == ENOENT) 915 path = NULL; 916 else if (error != 0) 917 goto done_free; 918 else { 919 if (flags & JAIL_UPDATE) { 920 error = EINVAL; 921 vfs_opterror(opts, 922 "path cannot be changed after creation"); 923 goto done_errmsg; 924 } 925 if (len == 0 || path[len - 1] != '\0') { 926 error = EINVAL; 927 goto done_free; 928 } 929 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 930 path, td); 931 error = namei(&nd); 932 if (error) 933 goto done_free; 934 root = nd.ni_vp; 935 NDFREE(&nd, NDF_ONLY_PNBUF); 936 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 937 strlcpy(g_path, path, MAXPATHLEN); 938 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 939 if (error == 0) 940 path = g_path; 941 else if (error == ENODEV) { 942 /* proceed if sysctl debug.disablefullpath == 1 */ 943 fullpath_disabled = 1; 944 if (len < 2 || (len == 2 && path[0] == '/')) 945 path = NULL; 946 } else { 947 /* exit on other errors */ 948 goto done_free; 949 } 950 if (root->v_type != VDIR) { 951 error = ENOTDIR; 952 vput(root); 953 goto done_free; 954 } 955 VOP_UNLOCK(root, 0); 956 if (fullpath_disabled) { 957 /* Leave room for a real-root full pathname. */ 958 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 959 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 960 error = ENAMETOOLONG; 961 goto done_free; 962 } 963 } 964 } 965 966 /* 967 * Grab the allprison lock before letting modules check their 968 * parameters. Once we have it, do not let go so we'll have a 969 * consistent view of the OSD list. 970 */ 971 sx_xlock(&allprison_lock); 972 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts); 973 if (error) 974 goto done_unlock_list; 975 976 /* By now, all parameters should have been noted. */ 977 TAILQ_FOREACH(opt, opts, link) { 978 if (!opt->seen && strcmp(opt->name, "errmsg")) { 979 error = EINVAL; 980 vfs_opterror(opts, "unknown parameter: %s", opt->name); 981 goto done_unlock_list; 982 } 983 } 984 985 /* 986 * See if we are creating a new record or updating an existing one. 987 * This abuses the file error codes ENOENT and EEXIST. 988 */ 989 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 990 if (!cuflags) { 991 error = EINVAL; 992 vfs_opterror(opts, "no valid operation (create or update)"); 993 goto done_unlock_list; 994 } 995 pr = NULL; 996 namelc = NULL; 997 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 998 namelc = strrchr(name, '.'); 999 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 1000 if (*p != '\0') 1001 jid = 0; 1002 } 1003 if (jid != 0) { 1004 /* 1005 * See if a requested jid already exists. There is an 1006 * information leak here if the jid exists but is not within 1007 * the caller's jail hierarchy. Jail creators will get EEXIST 1008 * even though they cannot see the jail, and CREATE | UPDATE 1009 * will return ENOENT which is not normally a valid error. 1010 */ 1011 if (jid < 0) { 1012 error = EINVAL; 1013 vfs_opterror(opts, "negative jid"); 1014 goto done_unlock_list; 1015 } 1016 pr = prison_find(jid); 1017 if (pr != NULL) { 1018 ppr = pr->pr_parent; 1019 /* Create: jid must not exist. */ 1020 if (cuflags == JAIL_CREATE) { 1021 mtx_unlock(&pr->pr_mtx); 1022 error = EEXIST; 1023 vfs_opterror(opts, "jail %d already exists", 1024 jid); 1025 goto done_unlock_list; 1026 } 1027 if (!prison_ischild(mypr, pr)) { 1028 mtx_unlock(&pr->pr_mtx); 1029 pr = NULL; 1030 } else if (pr->pr_uref == 0) { 1031 if (!(flags & JAIL_DYING)) { 1032 mtx_unlock(&pr->pr_mtx); 1033 error = ENOENT; 1034 vfs_opterror(opts, "jail %d is dying", 1035 jid); 1036 goto done_unlock_list; 1037 } else if ((flags & JAIL_ATTACH) || 1038 (pr_flags & PR_PERSIST)) { 1039 /* 1040 * A dying jail might be resurrected 1041 * (via attach or persist), but first 1042 * it must determine if another jail 1043 * has claimed its name. Accomplish 1044 * this by implicitly re-setting the 1045 * name. 1046 */ 1047 if (name == NULL) 1048 name = prison_name(mypr, pr); 1049 } 1050 } 1051 } 1052 if (pr == NULL) { 1053 /* Update: jid must exist. */ 1054 if (cuflags == JAIL_UPDATE) { 1055 error = ENOENT; 1056 vfs_opterror(opts, "jail %d not found", jid); 1057 goto done_unlock_list; 1058 } 1059 } 1060 } 1061 /* 1062 * If the caller provided a name, look for a jail by that name. 1063 * This has different semantics for creates and updates keyed by jid 1064 * (where the name must not already exist in a different jail), 1065 * and updates keyed by the name itself (where the name must exist 1066 * because that is the jail being updated). 1067 */ 1068 if (name != NULL) { 1069 namelc = strrchr(name, '.'); 1070 if (namelc == NULL) 1071 namelc = name; 1072 else { 1073 /* 1074 * This is a hierarchical name. Split it into the 1075 * parent and child names, and make sure the parent 1076 * exists or matches an already found jail. 1077 */ 1078 *namelc = '\0'; 1079 if (pr != NULL) { 1080 if (strncmp(name, ppr->pr_name, namelc - name) 1081 || ppr->pr_name[namelc - name] != '\0') { 1082 mtx_unlock(&pr->pr_mtx); 1083 error = EINVAL; 1084 vfs_opterror(opts, 1085 "cannot change jail's parent"); 1086 goto done_unlock_list; 1087 } 1088 } else { 1089 ppr = prison_find_name(mypr, name); 1090 if (ppr == NULL) { 1091 error = ENOENT; 1092 vfs_opterror(opts, 1093 "jail \"%s\" not found", name); 1094 goto done_unlock_list; 1095 } 1096 mtx_unlock(&ppr->pr_mtx); 1097 } 1098 name = ++namelc; 1099 } 1100 if (name[0] != '\0') { 1101 namelen = 1102 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1103 name_again: 1104 deadpr = NULL; 1105 FOREACH_PRISON_CHILD(ppr, tpr) { 1106 if (tpr != pr && tpr->pr_ref > 0 && 1107 !strcmp(tpr->pr_name + namelen, name)) { 1108 if (pr == NULL && 1109 cuflags != JAIL_CREATE) { 1110 mtx_lock(&tpr->pr_mtx); 1111 if (tpr->pr_ref > 0) { 1112 /* 1113 * Use this jail 1114 * for updates. 1115 */ 1116 if (tpr->pr_uref > 0) { 1117 pr = tpr; 1118 break; 1119 } 1120 deadpr = tpr; 1121 } 1122 mtx_unlock(&tpr->pr_mtx); 1123 } else if (tpr->pr_uref > 0) { 1124 /* 1125 * Create, or update(jid): 1126 * name must not exist in an 1127 * active sibling jail. 1128 */ 1129 error = EEXIST; 1130 if (pr != NULL) 1131 mtx_unlock(&pr->pr_mtx); 1132 vfs_opterror(opts, 1133 "jail \"%s\" already exists", 1134 name); 1135 goto done_unlock_list; 1136 } 1137 } 1138 } 1139 /* If no active jail is found, use a dying one. */ 1140 if (deadpr != NULL && pr == NULL) { 1141 if (flags & JAIL_DYING) { 1142 mtx_lock(&deadpr->pr_mtx); 1143 if (deadpr->pr_ref == 0) { 1144 mtx_unlock(&deadpr->pr_mtx); 1145 goto name_again; 1146 } 1147 pr = deadpr; 1148 } else if (cuflags == JAIL_UPDATE) { 1149 error = ENOENT; 1150 vfs_opterror(opts, 1151 "jail \"%s\" is dying", name); 1152 goto done_unlock_list; 1153 } 1154 } 1155 /* Update: name must exist if no jid. */ 1156 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1157 error = ENOENT; 1158 vfs_opterror(opts, "jail \"%s\" not found", 1159 name); 1160 goto done_unlock_list; 1161 } 1162 } 1163 } 1164 /* Update: must provide a jid or name. */ 1165 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1166 error = ENOENT; 1167 vfs_opterror(opts, "update specified no jail"); 1168 goto done_unlock_list; 1169 } 1170 1171 /* If there's no prison to update, create a new one and link it in. */ 1172 if (pr == NULL) { 1173 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1174 if (tpr->pr_childcount >= tpr->pr_childmax) { 1175 error = EPERM; 1176 vfs_opterror(opts, "prison limit exceeded"); 1177 goto done_unlock_list; 1178 } 1179 created = 1; 1180 mtx_lock(&ppr->pr_mtx); 1181 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) { 1182 mtx_unlock(&ppr->pr_mtx); 1183 error = ENOENT; 1184 vfs_opterror(opts, "parent jail went away!"); 1185 goto done_unlock_list; 1186 } 1187 ppr->pr_ref++; 1188 ppr->pr_uref++; 1189 mtx_unlock(&ppr->pr_mtx); 1190 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1191 if (jid == 0) { 1192 /* Find the next free jid. */ 1193 jid = lastprid + 1; 1194 findnext: 1195 if (jid == JAIL_MAX) 1196 jid = 1; 1197 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1198 if (tpr->pr_id < jid) 1199 continue; 1200 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1201 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1202 break; 1203 } 1204 if (jid == lastprid) { 1205 error = EAGAIN; 1206 vfs_opterror(opts, 1207 "no available jail IDs"); 1208 free(pr, M_PRISON); 1209 prison_deref(ppr, PD_DEREF | 1210 PD_DEUREF | PD_LIST_XLOCKED); 1211 goto done_releroot; 1212 } 1213 jid++; 1214 goto findnext; 1215 } 1216 lastprid = jid; 1217 } else { 1218 /* 1219 * The jail already has a jid (that did not yet exist), 1220 * so just find where to insert it. 1221 */ 1222 TAILQ_FOREACH(tpr, &allprison, pr_list) 1223 if (tpr->pr_id >= jid) { 1224 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1225 break; 1226 } 1227 } 1228 if (tpr == NULL) 1229 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1230 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1231 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1232 tpr->pr_childcount++; 1233 1234 pr->pr_parent = ppr; 1235 pr->pr_id = jid; 1236 1237 /* Set some default values, and inherit some from the parent. */ 1238 if (name == NULL) 1239 name = ""; 1240 if (path == NULL) { 1241 path = "/"; 1242 root = mypr->pr_root; 1243 vref(root); 1244 } 1245 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1246 pr->pr_flags |= PR_HOST; 1247 #if defined(INET) || defined(INET6) 1248 #ifdef VIMAGE 1249 if (!(pr_flags & PR_VNET)) 1250 #endif 1251 { 1252 #ifdef INET 1253 if (!(ch_flags & PR_IP4_USER)) 1254 pr->pr_flags |= 1255 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE; 1256 else if (!(pr_flags & PR_IP4_USER)) { 1257 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1258 if (ppr->pr_ip4 != NULL) { 1259 pr->pr_ip4s = ppr->pr_ip4s; 1260 pr->pr_ip4 = malloc(pr->pr_ip4s * 1261 sizeof(struct in_addr), M_PRISON, 1262 M_WAITOK); 1263 bcopy(ppr->pr_ip4, pr->pr_ip4, 1264 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1265 } 1266 } 1267 #endif 1268 #ifdef INET6 1269 if (!(ch_flags & PR_IP6_USER)) 1270 pr->pr_flags |= 1271 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE; 1272 else if (!(pr_flags & PR_IP6_USER)) { 1273 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1274 if (ppr->pr_ip6 != NULL) { 1275 pr->pr_ip6s = ppr->pr_ip6s; 1276 pr->pr_ip6 = malloc(pr->pr_ip6s * 1277 sizeof(struct in6_addr), M_PRISON, 1278 M_WAITOK); 1279 bcopy(ppr->pr_ip6, pr->pr_ip6, 1280 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1281 } 1282 } 1283 #endif 1284 } 1285 #endif 1286 /* Source address selection is always on by default. */ 1287 pr->pr_flags |= _PR_IP_SADDRSEL; 1288 1289 pr->pr_securelevel = ppr->pr_securelevel; 1290 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1291 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 1292 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1293 1294 LIST_INIT(&pr->pr_children); 1295 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1296 1297 #ifdef VIMAGE 1298 /* Allocate a new vnet if specified. */ 1299 pr->pr_vnet = (pr_flags & PR_VNET) 1300 ? vnet_alloc() : ppr->pr_vnet; 1301 #endif 1302 /* 1303 * Allocate a dedicated cpuset for each jail. 1304 * Unlike other initial settings, this may return an erorr. 1305 */ 1306 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1307 if (error) { 1308 prison_deref(pr, PD_LIST_XLOCKED); 1309 goto done_releroot; 1310 } 1311 1312 mtx_lock(&pr->pr_mtx); 1313 /* 1314 * New prisons do not yet have a reference, because we do not 1315 * want other to see the incomplete prison once the 1316 * allprison_lock is downgraded. 1317 */ 1318 } else { 1319 created = 0; 1320 /* 1321 * Grab a reference for existing prisons, to ensure they 1322 * continue to exist for the duration of the call. 1323 */ 1324 pr->pr_ref++; 1325 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1326 if ((pr->pr_flags & PR_VNET) && 1327 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1328 error = EINVAL; 1329 vfs_opterror(opts, 1330 "vnet jails cannot have IP address restrictions"); 1331 goto done_deref_locked; 1332 } 1333 #endif 1334 #ifdef INET 1335 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1336 error = EINVAL; 1337 vfs_opterror(opts, 1338 "ip4 cannot be changed after creation"); 1339 goto done_deref_locked; 1340 } 1341 #endif 1342 #ifdef INET6 1343 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1344 error = EINVAL; 1345 vfs_opterror(opts, 1346 "ip6 cannot be changed after creation"); 1347 goto done_deref_locked; 1348 } 1349 #endif 1350 } 1351 1352 /* Do final error checking before setting anything. */ 1353 if (gotslevel) { 1354 if (slevel < ppr->pr_securelevel) { 1355 error = EPERM; 1356 goto done_deref_locked; 1357 } 1358 } 1359 if (gotchildmax) { 1360 if (childmax >= ppr->pr_childmax) { 1361 error = EPERM; 1362 goto done_deref_locked; 1363 } 1364 } 1365 if (gotenforce) { 1366 if (enforce < ppr->pr_enforce_statfs) { 1367 error = EPERM; 1368 goto done_deref_locked; 1369 } 1370 } 1371 if (gotrsnum) { 1372 /* 1373 * devfs_rsnum is a uint16_t 1374 */ 1375 if (rsnum < 0 || rsnum > 65535) { 1376 error = EINVAL; 1377 goto done_deref_locked; 1378 } 1379 /* 1380 * Nested jails always inherit parent's devfs ruleset 1381 */ 1382 if (jailed(td->td_ucred)) { 1383 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1384 error = EPERM; 1385 goto done_deref_locked; 1386 } else 1387 rsnum = ppr->pr_devfs_rsnum; 1388 } 1389 } 1390 #ifdef INET 1391 if (ip4s > 0) { 1392 if (ppr->pr_flags & PR_IP4) { 1393 /* 1394 * Make sure the new set of IP addresses is a 1395 * subset of the parent's list. Don't worry 1396 * about the parent being unlocked, as any 1397 * setting is done with allprison_lock held. 1398 */ 1399 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1400 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1401 break; 1402 if (ij == ppr->pr_ip4s) { 1403 error = EPERM; 1404 goto done_deref_locked; 1405 } 1406 if (ip4s > 1) { 1407 for (ii = ij = 1; ii < ip4s; ii++) { 1408 if (ip4[ii].s_addr == 1409 ppr->pr_ip4[0].s_addr) 1410 continue; 1411 for (; ij < ppr->pr_ip4s; ij++) 1412 if (ip4[ii].s_addr == 1413 ppr->pr_ip4[ij].s_addr) 1414 break; 1415 if (ij == ppr->pr_ip4s) 1416 break; 1417 } 1418 if (ij == ppr->pr_ip4s) { 1419 error = EPERM; 1420 goto done_deref_locked; 1421 } 1422 } 1423 } 1424 /* 1425 * Check for conflicting IP addresses. We permit them 1426 * if there is no more than one IP on each jail. If 1427 * there is a duplicate on a jail with more than one 1428 * IP stop checking and return error. 1429 */ 1430 tppr = ppr; 1431 #ifdef VIMAGE 1432 for (; tppr != &prison0; tppr = tppr->pr_parent) 1433 if (tppr->pr_flags & PR_VNET) 1434 break; 1435 #endif 1436 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1437 if (tpr == pr || 1438 #ifdef VIMAGE 1439 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1440 #endif 1441 tpr->pr_uref == 0) { 1442 descend = 0; 1443 continue; 1444 } 1445 if (!(tpr->pr_flags & PR_IP4_USER)) 1446 continue; 1447 descend = 0; 1448 if (tpr->pr_ip4 == NULL || 1449 (ip4s == 1 && tpr->pr_ip4s == 1)) 1450 continue; 1451 for (ii = 0; ii < ip4s; ii++) { 1452 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1453 error = EADDRINUSE; 1454 vfs_opterror(opts, 1455 "IPv4 addresses clash"); 1456 goto done_deref_locked; 1457 } 1458 } 1459 } 1460 } 1461 #endif 1462 #ifdef INET6 1463 if (ip6s > 0) { 1464 if (ppr->pr_flags & PR_IP6) { 1465 /* 1466 * Make sure the new set of IP addresses is a 1467 * subset of the parent's list. 1468 */ 1469 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1470 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1471 &ppr->pr_ip6[ij])) 1472 break; 1473 if (ij == ppr->pr_ip6s) { 1474 error = EPERM; 1475 goto done_deref_locked; 1476 } 1477 if (ip6s > 1) { 1478 for (ii = ij = 1; ii < ip6s; ii++) { 1479 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1480 &ppr->pr_ip6[0])) 1481 continue; 1482 for (; ij < ppr->pr_ip6s; ij++) 1483 if (IN6_ARE_ADDR_EQUAL( 1484 &ip6[ii], &ppr->pr_ip6[ij])) 1485 break; 1486 if (ij == ppr->pr_ip6s) 1487 break; 1488 } 1489 if (ij == ppr->pr_ip6s) { 1490 error = EPERM; 1491 goto done_deref_locked; 1492 } 1493 } 1494 } 1495 /* Check for conflicting IP addresses. */ 1496 tppr = ppr; 1497 #ifdef VIMAGE 1498 for (; tppr != &prison0; tppr = tppr->pr_parent) 1499 if (tppr->pr_flags & PR_VNET) 1500 break; 1501 #endif 1502 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1503 if (tpr == pr || 1504 #ifdef VIMAGE 1505 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1506 #endif 1507 tpr->pr_uref == 0) { 1508 descend = 0; 1509 continue; 1510 } 1511 if (!(tpr->pr_flags & PR_IP6_USER)) 1512 continue; 1513 descend = 0; 1514 if (tpr->pr_ip6 == NULL || 1515 (ip6s == 1 && tpr->pr_ip6s == 1)) 1516 continue; 1517 for (ii = 0; ii < ip6s; ii++) { 1518 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1519 error = EADDRINUSE; 1520 vfs_opterror(opts, 1521 "IPv6 addresses clash"); 1522 goto done_deref_locked; 1523 } 1524 } 1525 } 1526 } 1527 #endif 1528 onamelen = namelen = 0; 1529 if (name != NULL) { 1530 /* Give a default name of the jid. */ 1531 if (name[0] == '\0') 1532 snprintf(name = numbuf, sizeof(numbuf), "%d", jid); 1533 else if (*namelc == '0' || (strtoul(namelc, &p, 10) != jid && 1534 *p == '\0')) { 1535 error = EINVAL; 1536 vfs_opterror(opts, 1537 "name cannot be numeric (unless it is the jid)"); 1538 goto done_deref_locked; 1539 } 1540 /* 1541 * Make sure the name isn't too long for the prison or its 1542 * children. 1543 */ 1544 onamelen = strlen(pr->pr_name); 1545 namelen = strlen(name); 1546 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) { 1547 error = ENAMETOOLONG; 1548 goto done_deref_locked; 1549 } 1550 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1551 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1552 sizeof(pr->pr_name)) { 1553 error = ENAMETOOLONG; 1554 goto done_deref_locked; 1555 } 1556 } 1557 } 1558 if (pr_allow & ~ppr->pr_allow) { 1559 error = EPERM; 1560 goto done_deref_locked; 1561 } 1562 1563 /* Set the parameters of the prison. */ 1564 #ifdef INET 1565 redo_ip4 = 0; 1566 if (pr_flags & PR_IP4_USER) { 1567 pr->pr_flags |= PR_IP4; 1568 free(pr->pr_ip4, M_PRISON); 1569 pr->pr_ip4s = ip4s; 1570 pr->pr_ip4 = ip4; 1571 ip4 = NULL; 1572 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1573 #ifdef VIMAGE 1574 if (tpr->pr_flags & PR_VNET) { 1575 descend = 0; 1576 continue; 1577 } 1578 #endif 1579 if (prison_restrict_ip4(tpr, NULL)) { 1580 redo_ip4 = 1; 1581 descend = 0; 1582 } 1583 } 1584 } 1585 #endif 1586 #ifdef INET6 1587 redo_ip6 = 0; 1588 if (pr_flags & PR_IP6_USER) { 1589 pr->pr_flags |= PR_IP6; 1590 free(pr->pr_ip6, M_PRISON); 1591 pr->pr_ip6s = ip6s; 1592 pr->pr_ip6 = ip6; 1593 ip6 = NULL; 1594 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1595 #ifdef VIMAGE 1596 if (tpr->pr_flags & PR_VNET) { 1597 descend = 0; 1598 continue; 1599 } 1600 #endif 1601 if (prison_restrict_ip6(tpr, NULL)) { 1602 redo_ip6 = 1; 1603 descend = 0; 1604 } 1605 } 1606 } 1607 #endif 1608 if (gotslevel) { 1609 pr->pr_securelevel = slevel; 1610 /* Set all child jails to be at least this level. */ 1611 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1612 if (tpr->pr_securelevel < slevel) 1613 tpr->pr_securelevel = slevel; 1614 } 1615 if (gotchildmax) { 1616 pr->pr_childmax = childmax; 1617 /* Set all child jails to under this limit. */ 1618 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1619 if (tpr->pr_childmax > childmax - level) 1620 tpr->pr_childmax = childmax > level 1621 ? childmax - level : 0; 1622 } 1623 if (gotenforce) { 1624 pr->pr_enforce_statfs = enforce; 1625 /* Pass this restriction on to the children. */ 1626 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1627 if (tpr->pr_enforce_statfs < enforce) 1628 tpr->pr_enforce_statfs = enforce; 1629 } 1630 if (gotrsnum) { 1631 pr->pr_devfs_rsnum = rsnum; 1632 /* Pass this restriction on to the children. */ 1633 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1634 tpr->pr_devfs_rsnum = rsnum; 1635 } 1636 if (name != NULL) { 1637 if (ppr == &prison0) 1638 strlcpy(pr->pr_name, name, sizeof(pr->pr_name)); 1639 else 1640 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1641 ppr->pr_name, name); 1642 /* Change this component of child names. */ 1643 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1644 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1645 strlen(tpr->pr_name + onamelen) + 1); 1646 bcopy(pr->pr_name, tpr->pr_name, namelen); 1647 } 1648 } 1649 if (path != NULL) { 1650 /* Try to keep a real-rooted full pathname. */ 1651 if (fullpath_disabled && path[0] == '/' && 1652 strcmp(mypr->pr_path, "/")) 1653 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1654 mypr->pr_path, path); 1655 else 1656 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1657 pr->pr_root = root; 1658 } 1659 if (PR_HOST & ch_flags & ~pr_flags) { 1660 if (pr->pr_flags & PR_HOST) { 1661 /* 1662 * Copy the parent's host info. As with pr_ip4 above, 1663 * the lack of a lock on the parent is not a problem; 1664 * it is always set with allprison_lock at least 1665 * shared, and is held exclusively here. 1666 */ 1667 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1668 sizeof(pr->pr_hostname)); 1669 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1670 sizeof(pr->pr_domainname)); 1671 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1672 sizeof(pr->pr_hostuuid)); 1673 pr->pr_hostid = pr->pr_parent->pr_hostid; 1674 } 1675 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1676 /* Set this prison, and any descendants without PR_HOST. */ 1677 if (host != NULL) 1678 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1679 if (domain != NULL) 1680 strlcpy(pr->pr_domainname, domain, 1681 sizeof(pr->pr_domainname)); 1682 if (uuid != NULL) 1683 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1684 if (gothid) 1685 pr->pr_hostid = hid; 1686 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1687 if (tpr->pr_flags & PR_HOST) 1688 descend = 0; 1689 else { 1690 if (host != NULL) 1691 strlcpy(tpr->pr_hostname, 1692 pr->pr_hostname, 1693 sizeof(tpr->pr_hostname)); 1694 if (domain != NULL) 1695 strlcpy(tpr->pr_domainname, 1696 pr->pr_domainname, 1697 sizeof(tpr->pr_domainname)); 1698 if (uuid != NULL) 1699 strlcpy(tpr->pr_hostuuid, 1700 pr->pr_hostuuid, 1701 sizeof(tpr->pr_hostuuid)); 1702 if (gothid) 1703 tpr->pr_hostid = hid; 1704 } 1705 } 1706 } 1707 if ((tallow = ch_allow & ~pr_allow)) { 1708 /* Clear allow bits in all children. */ 1709 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1710 tpr->pr_allow &= ~tallow; 1711 } 1712 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1713 /* 1714 * Persistent prisons get an extra reference, and prisons losing their 1715 * persist flag lose that reference. Only do this for existing prisons 1716 * for now, so new ones will remain unseen until after the module 1717 * handlers have completed. 1718 */ 1719 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1720 if (pr_flags & PR_PERSIST) { 1721 pr->pr_ref++; 1722 pr->pr_uref++; 1723 } else { 1724 pr->pr_ref--; 1725 pr->pr_uref--; 1726 } 1727 } 1728 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1729 mtx_unlock(&pr->pr_mtx); 1730 1731 #ifdef RACCT 1732 if (created) 1733 prison_racct_attach(pr); 1734 #endif 1735 1736 /* Locks may have prevented a complete restriction of child IP 1737 * addresses. If so, allocate some more memory and try again. 1738 */ 1739 #ifdef INET 1740 while (redo_ip4) { 1741 ip4s = pr->pr_ip4s; 1742 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1743 mtx_lock(&pr->pr_mtx); 1744 redo_ip4 = 0; 1745 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1746 #ifdef VIMAGE 1747 if (tpr->pr_flags & PR_VNET) { 1748 descend = 0; 1749 continue; 1750 } 1751 #endif 1752 if (prison_restrict_ip4(tpr, ip4)) { 1753 if (ip4 != NULL) 1754 ip4 = NULL; 1755 else 1756 redo_ip4 = 1; 1757 } 1758 } 1759 mtx_unlock(&pr->pr_mtx); 1760 } 1761 #endif 1762 #ifdef INET6 1763 while (redo_ip6) { 1764 ip6s = pr->pr_ip6s; 1765 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1766 mtx_lock(&pr->pr_mtx); 1767 redo_ip6 = 0; 1768 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1769 #ifdef VIMAGE 1770 if (tpr->pr_flags & PR_VNET) { 1771 descend = 0; 1772 continue; 1773 } 1774 #endif 1775 if (prison_restrict_ip6(tpr, ip6)) { 1776 if (ip6 != NULL) 1777 ip6 = NULL; 1778 else 1779 redo_ip6 = 1; 1780 } 1781 } 1782 mtx_unlock(&pr->pr_mtx); 1783 } 1784 #endif 1785 1786 /* Let the modules do their work. */ 1787 sx_downgrade(&allprison_lock); 1788 if (created) { 1789 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1790 if (error) { 1791 prison_deref(pr, PD_LIST_SLOCKED); 1792 goto done_errmsg; 1793 } 1794 } 1795 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1796 if (error) { 1797 prison_deref(pr, created 1798 ? PD_LIST_SLOCKED 1799 : PD_DEREF | PD_LIST_SLOCKED); 1800 goto done_errmsg; 1801 } 1802 1803 /* Attach this process to the prison if requested. */ 1804 if (flags & JAIL_ATTACH) { 1805 mtx_lock(&pr->pr_mtx); 1806 error = do_jail_attach(td, pr); 1807 if (error) { 1808 vfs_opterror(opts, "attach failed"); 1809 if (!created) 1810 prison_deref(pr, PD_DEREF); 1811 goto done_errmsg; 1812 } 1813 } 1814 1815 #ifdef RACCT 1816 if (!created) { 1817 sx_sunlock(&allprison_lock); 1818 prison_racct_modify(pr); 1819 sx_slock(&allprison_lock); 1820 } 1821 #endif 1822 1823 td->td_retval[0] = pr->pr_id; 1824 1825 /* 1826 * Now that it is all there, drop the temporary reference from existing 1827 * prisons. Or add a reference to newly created persistent prisons 1828 * (which was not done earlier so that the prison would not be publicly 1829 * visible). 1830 */ 1831 if (!created) { 1832 prison_deref(pr, (flags & JAIL_ATTACH) 1833 ? PD_DEREF 1834 : PD_DEREF | PD_LIST_SLOCKED); 1835 } else { 1836 if (pr_flags & PR_PERSIST) { 1837 mtx_lock(&pr->pr_mtx); 1838 pr->pr_ref++; 1839 pr->pr_uref++; 1840 mtx_unlock(&pr->pr_mtx); 1841 } 1842 if (!(flags & JAIL_ATTACH)) 1843 sx_sunlock(&allprison_lock); 1844 } 1845 1846 goto done_errmsg; 1847 1848 done_deref_locked: 1849 prison_deref(pr, created 1850 ? PD_LOCKED | PD_LIST_XLOCKED 1851 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1852 goto done_releroot; 1853 done_unlock_list: 1854 sx_xunlock(&allprison_lock); 1855 done_releroot: 1856 if (root != NULL) 1857 vrele(root); 1858 done_errmsg: 1859 if (error) { 1860 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1861 if (errmsg_len > 0) { 1862 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1863 if (errmsg_pos > 0) { 1864 if (optuio->uio_segflg == UIO_SYSSPACE) 1865 bcopy(errmsg, 1866 optuio->uio_iov[errmsg_pos].iov_base, 1867 errmsg_len); 1868 else 1869 copyout(errmsg, 1870 optuio->uio_iov[errmsg_pos].iov_base, 1871 errmsg_len); 1872 } 1873 } 1874 } 1875 done_free: 1876 #ifdef INET 1877 free(ip4, M_PRISON); 1878 #endif 1879 #ifdef INET6 1880 free(ip6, M_PRISON); 1881 #endif 1882 if (g_path != NULL) 1883 free(g_path, M_TEMP); 1884 vfs_freeopts(opts); 1885 return (error); 1886 } 1887 1888 1889 /* 1890 * struct jail_get_args { 1891 * struct iovec *iovp; 1892 * unsigned int iovcnt; 1893 * int flags; 1894 * }; 1895 */ 1896 int 1897 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1898 { 1899 struct uio *auio; 1900 int error; 1901 1902 /* Check that we have an even number of iovecs. */ 1903 if (uap->iovcnt & 1) 1904 return (EINVAL); 1905 1906 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1907 if (error) 1908 return (error); 1909 error = kern_jail_get(td, auio, uap->flags); 1910 if (error == 0) 1911 error = copyout(auio->uio_iov, uap->iovp, 1912 uap->iovcnt * sizeof (struct iovec)); 1913 free(auio, M_IOV); 1914 return (error); 1915 } 1916 1917 int 1918 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1919 { 1920 struct prison *pr, *mypr; 1921 struct vfsopt *opt; 1922 struct vfsoptlist *opts; 1923 char *errmsg, *name; 1924 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1925 1926 if (flags & ~JAIL_GET_MASK) 1927 return (EINVAL); 1928 1929 /* Get the parameter list. */ 1930 error = vfs_buildopts(optuio, &opts); 1931 if (error) 1932 return (error); 1933 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1934 mypr = td->td_ucred->cr_prison; 1935 1936 /* 1937 * Find the prison specified by one of: lastjid, jid, name. 1938 */ 1939 sx_slock(&allprison_lock); 1940 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1941 if (error == 0) { 1942 TAILQ_FOREACH(pr, &allprison, pr_list) { 1943 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1944 mtx_lock(&pr->pr_mtx); 1945 if (pr->pr_ref > 0 && 1946 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1947 break; 1948 mtx_unlock(&pr->pr_mtx); 1949 } 1950 } 1951 if (pr != NULL) 1952 goto found_prison; 1953 error = ENOENT; 1954 vfs_opterror(opts, "no jail after %d", jid); 1955 goto done_unlock_list; 1956 } else if (error != ENOENT) 1957 goto done_unlock_list; 1958 1959 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1960 if (error == 0) { 1961 if (jid != 0) { 1962 pr = prison_find_child(mypr, jid); 1963 if (pr != NULL) { 1964 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1965 mtx_unlock(&pr->pr_mtx); 1966 error = ENOENT; 1967 vfs_opterror(opts, "jail %d is dying", 1968 jid); 1969 goto done_unlock_list; 1970 } 1971 goto found_prison; 1972 } 1973 error = ENOENT; 1974 vfs_opterror(opts, "jail %d not found", jid); 1975 goto done_unlock_list; 1976 } 1977 } else if (error != ENOENT) 1978 goto done_unlock_list; 1979 1980 error = vfs_getopt(opts, "name", (void **)&name, &len); 1981 if (error == 0) { 1982 if (len == 0 || name[len - 1] != '\0') { 1983 error = EINVAL; 1984 goto done_unlock_list; 1985 } 1986 pr = prison_find_name(mypr, name); 1987 if (pr != NULL) { 1988 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1989 mtx_unlock(&pr->pr_mtx); 1990 error = ENOENT; 1991 vfs_opterror(opts, "jail \"%s\" is dying", 1992 name); 1993 goto done_unlock_list; 1994 } 1995 goto found_prison; 1996 } 1997 error = ENOENT; 1998 vfs_opterror(opts, "jail \"%s\" not found", name); 1999 goto done_unlock_list; 2000 } else if (error != ENOENT) 2001 goto done_unlock_list; 2002 2003 vfs_opterror(opts, "no jail specified"); 2004 error = ENOENT; 2005 goto done_unlock_list; 2006 2007 found_prison: 2008 /* Get the parameters of the prison. */ 2009 pr->pr_ref++; 2010 locked = PD_LOCKED; 2011 td->td_retval[0] = pr->pr_id; 2012 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2013 if (error != 0 && error != ENOENT) 2014 goto done_deref; 2015 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2016 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2017 if (error != 0 && error != ENOENT) 2018 goto done_deref; 2019 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2020 if (error != 0 && error != ENOENT) 2021 goto done_deref; 2022 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2023 sizeof(pr->pr_cpuset->cs_id)); 2024 if (error != 0 && error != ENOENT) 2025 goto done_deref; 2026 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2027 if (error != 0 && error != ENOENT) 2028 goto done_deref; 2029 #ifdef INET 2030 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2031 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2032 if (error != 0 && error != ENOENT) 2033 goto done_deref; 2034 #endif 2035 #ifdef INET6 2036 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2037 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2038 if (error != 0 && error != ENOENT) 2039 goto done_deref; 2040 #endif 2041 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2042 sizeof(pr->pr_securelevel)); 2043 if (error != 0 && error != ENOENT) 2044 goto done_deref; 2045 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2046 sizeof(pr->pr_childcount)); 2047 if (error != 0 && error != ENOENT) 2048 goto done_deref; 2049 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2050 sizeof(pr->pr_childmax)); 2051 if (error != 0 && error != ENOENT) 2052 goto done_deref; 2053 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2054 if (error != 0 && error != ENOENT) 2055 goto done_deref; 2056 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2057 if (error != 0 && error != ENOENT) 2058 goto done_deref; 2059 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2060 if (error != 0 && error != ENOENT) 2061 goto done_deref; 2062 #ifdef COMPAT_FREEBSD32 2063 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2064 uint32_t hid32 = pr->pr_hostid; 2065 2066 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2067 } else 2068 #endif 2069 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2070 sizeof(pr->pr_hostid)); 2071 if (error != 0 && error != ENOENT) 2072 goto done_deref; 2073 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2074 sizeof(pr->pr_enforce_statfs)); 2075 if (error != 0 && error != ENOENT) 2076 goto done_deref; 2077 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2078 sizeof(pr->pr_devfs_rsnum)); 2079 if (error != 0 && error != ENOENT) 2080 goto done_deref; 2081 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 2082 fi++) { 2083 if (pr_flag_names[fi] == NULL) 2084 continue; 2085 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2086 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2087 if (error != 0 && error != ENOENT) 2088 goto done_deref; 2089 i = !i; 2090 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2091 if (error != 0 && error != ENOENT) 2092 goto done_deref; 2093 } 2094 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 2095 fi++) { 2096 i = pr->pr_flags & 2097 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2098 i = pr_flag_jailsys[fi].disable && 2099 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2100 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2101 : JAIL_SYS_INHERIT; 2102 error = 2103 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2104 if (error != 0 && error != ENOENT) 2105 goto done_deref; 2106 } 2107 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 2108 fi++) { 2109 if (pr_allow_names[fi] == NULL) 2110 continue; 2111 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2112 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2113 if (error != 0 && error != ENOENT) 2114 goto done_deref; 2115 i = !i; 2116 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2117 if (error != 0 && error != ENOENT) 2118 goto done_deref; 2119 } 2120 i = (pr->pr_uref == 0); 2121 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2122 if (error != 0 && error != ENOENT) 2123 goto done_deref; 2124 i = !i; 2125 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2126 if (error != 0 && error != ENOENT) 2127 goto done_deref; 2128 2129 /* Get the module parameters. */ 2130 mtx_unlock(&pr->pr_mtx); 2131 locked = 0; 2132 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2133 if (error) 2134 goto done_deref; 2135 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2136 2137 /* By now, all parameters should have been noted. */ 2138 TAILQ_FOREACH(opt, opts, link) { 2139 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2140 error = EINVAL; 2141 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2142 goto done_errmsg; 2143 } 2144 } 2145 2146 /* Write the fetched parameters back to userspace. */ 2147 error = 0; 2148 TAILQ_FOREACH(opt, opts, link) { 2149 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2150 pos = 2 * opt->pos + 1; 2151 optuio->uio_iov[pos].iov_len = opt->len; 2152 if (opt->value != NULL) { 2153 if (optuio->uio_segflg == UIO_SYSSPACE) { 2154 bcopy(opt->value, 2155 optuio->uio_iov[pos].iov_base, 2156 opt->len); 2157 } else { 2158 error = copyout(opt->value, 2159 optuio->uio_iov[pos].iov_base, 2160 opt->len); 2161 if (error) 2162 break; 2163 } 2164 } 2165 } 2166 } 2167 goto done_errmsg; 2168 2169 done_deref: 2170 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2171 goto done_errmsg; 2172 2173 done_unlock_list: 2174 sx_sunlock(&allprison_lock); 2175 done_errmsg: 2176 if (error && errmsg_pos >= 0) { 2177 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2178 errmsg_pos = 2 * errmsg_pos + 1; 2179 if (errmsg_len > 0) { 2180 if (optuio->uio_segflg == UIO_SYSSPACE) 2181 bcopy(errmsg, 2182 optuio->uio_iov[errmsg_pos].iov_base, 2183 errmsg_len); 2184 else 2185 copyout(errmsg, 2186 optuio->uio_iov[errmsg_pos].iov_base, 2187 errmsg_len); 2188 } 2189 } 2190 vfs_freeopts(opts); 2191 return (error); 2192 } 2193 2194 2195 /* 2196 * struct jail_remove_args { 2197 * int jid; 2198 * }; 2199 */ 2200 int 2201 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2202 { 2203 struct prison *pr, *cpr, *lpr, *tpr; 2204 int descend, error; 2205 2206 error = priv_check(td, PRIV_JAIL_REMOVE); 2207 if (error) 2208 return (error); 2209 2210 sx_xlock(&allprison_lock); 2211 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2212 if (pr == NULL) { 2213 sx_xunlock(&allprison_lock); 2214 return (EINVAL); 2215 } 2216 2217 /* Remove all descendants of this prison, then remove this prison. */ 2218 pr->pr_ref++; 2219 pr->pr_flags |= PR_REMOVE; 2220 if (!LIST_EMPTY(&pr->pr_children)) { 2221 mtx_unlock(&pr->pr_mtx); 2222 lpr = NULL; 2223 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2224 mtx_lock(&cpr->pr_mtx); 2225 if (cpr->pr_ref > 0) { 2226 tpr = cpr; 2227 cpr->pr_ref++; 2228 cpr->pr_flags |= PR_REMOVE; 2229 } else { 2230 /* Already removed - do not do it again. */ 2231 tpr = NULL; 2232 } 2233 mtx_unlock(&cpr->pr_mtx); 2234 if (lpr != NULL) { 2235 mtx_lock(&lpr->pr_mtx); 2236 prison_remove_one(lpr); 2237 sx_xlock(&allprison_lock); 2238 } 2239 lpr = tpr; 2240 } 2241 if (lpr != NULL) { 2242 mtx_lock(&lpr->pr_mtx); 2243 prison_remove_one(lpr); 2244 sx_xlock(&allprison_lock); 2245 } 2246 mtx_lock(&pr->pr_mtx); 2247 } 2248 prison_remove_one(pr); 2249 return (0); 2250 } 2251 2252 static void 2253 prison_remove_one(struct prison *pr) 2254 { 2255 struct proc *p; 2256 int deuref; 2257 2258 /* If the prison was persistent, it is not anymore. */ 2259 deuref = 0; 2260 if (pr->pr_flags & PR_PERSIST) { 2261 pr->pr_ref--; 2262 deuref = PD_DEUREF; 2263 pr->pr_flags &= ~PR_PERSIST; 2264 } 2265 2266 /* 2267 * jail_remove added a reference. If that's the only one, remove 2268 * the prison now. 2269 */ 2270 KASSERT(pr->pr_ref > 0, 2271 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2272 if (pr->pr_ref == 1) { 2273 prison_deref(pr, 2274 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2275 return; 2276 } 2277 2278 mtx_unlock(&pr->pr_mtx); 2279 sx_xunlock(&allprison_lock); 2280 /* 2281 * Kill all processes unfortunate enough to be attached to this prison. 2282 */ 2283 sx_slock(&allproc_lock); 2284 LIST_FOREACH(p, &allproc, p_list) { 2285 PROC_LOCK(p); 2286 if (p->p_state != PRS_NEW && p->p_ucred && 2287 p->p_ucred->cr_prison == pr) 2288 kern_psignal(p, SIGKILL); 2289 PROC_UNLOCK(p); 2290 } 2291 sx_sunlock(&allproc_lock); 2292 /* Remove the temporary reference added by jail_remove. */ 2293 prison_deref(pr, deuref | PD_DEREF); 2294 } 2295 2296 2297 /* 2298 * struct jail_attach_args { 2299 * int jid; 2300 * }; 2301 */ 2302 int 2303 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2304 { 2305 struct prison *pr; 2306 int error; 2307 2308 error = priv_check(td, PRIV_JAIL_ATTACH); 2309 if (error) 2310 return (error); 2311 2312 sx_slock(&allprison_lock); 2313 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2314 if (pr == NULL) { 2315 sx_sunlock(&allprison_lock); 2316 return (EINVAL); 2317 } 2318 2319 /* 2320 * Do not allow a process to attach to a prison that is not 2321 * considered to be "alive". 2322 */ 2323 if (pr->pr_uref == 0) { 2324 mtx_unlock(&pr->pr_mtx); 2325 sx_sunlock(&allprison_lock); 2326 return (EINVAL); 2327 } 2328 2329 return (do_jail_attach(td, pr)); 2330 } 2331 2332 static int 2333 do_jail_attach(struct thread *td, struct prison *pr) 2334 { 2335 struct prison *ppr; 2336 struct proc *p; 2337 struct ucred *newcred, *oldcred; 2338 int error; 2339 2340 /* 2341 * XXX: Note that there is a slight race here if two threads 2342 * in the same privileged process attempt to attach to two 2343 * different jails at the same time. It is important for 2344 * user processes not to do this, or they might end up with 2345 * a process root from one prison, but attached to the jail 2346 * of another. 2347 */ 2348 pr->pr_ref++; 2349 pr->pr_uref++; 2350 mtx_unlock(&pr->pr_mtx); 2351 2352 /* Let modules do whatever they need to prepare for attaching. */ 2353 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2354 if (error) { 2355 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2356 return (error); 2357 } 2358 sx_sunlock(&allprison_lock); 2359 2360 /* 2361 * Reparent the newly attached process to this jail. 2362 */ 2363 ppr = td->td_ucred->cr_prison; 2364 p = td->td_proc; 2365 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2366 if (error) 2367 goto e_revert_osd; 2368 2369 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2370 if ((error = change_dir(pr->pr_root, td)) != 0) 2371 goto e_unlock; 2372 #ifdef MAC 2373 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2374 goto e_unlock; 2375 #endif 2376 VOP_UNLOCK(pr->pr_root, 0); 2377 if ((error = change_root(pr->pr_root, td))) 2378 goto e_revert_osd; 2379 2380 newcred = crget(); 2381 PROC_LOCK(p); 2382 oldcred = p->p_ucred; 2383 setsugid(p); 2384 crcopy(newcred, oldcred); 2385 newcred->cr_prison = pr; 2386 p->p_ucred = newcred; 2387 PROC_UNLOCK(p); 2388 #ifdef RACCT 2389 racct_proc_ucred_changed(p, oldcred, newcred); 2390 #endif 2391 crfree(oldcred); 2392 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2393 return (0); 2394 e_unlock: 2395 VOP_UNLOCK(pr->pr_root, 0); 2396 e_revert_osd: 2397 /* Tell modules this thread is still in its old jail after all. */ 2398 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2399 prison_deref(pr, PD_DEREF | PD_DEUREF); 2400 return (error); 2401 } 2402 2403 2404 /* 2405 * Returns a locked prison instance, or NULL on failure. 2406 */ 2407 struct prison * 2408 prison_find(int prid) 2409 { 2410 struct prison *pr; 2411 2412 sx_assert(&allprison_lock, SX_LOCKED); 2413 TAILQ_FOREACH(pr, &allprison, pr_list) { 2414 if (pr->pr_id == prid) { 2415 mtx_lock(&pr->pr_mtx); 2416 if (pr->pr_ref > 0) 2417 return (pr); 2418 mtx_unlock(&pr->pr_mtx); 2419 } 2420 } 2421 return (NULL); 2422 } 2423 2424 /* 2425 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2426 */ 2427 struct prison * 2428 prison_find_child(struct prison *mypr, int prid) 2429 { 2430 struct prison *pr; 2431 int descend; 2432 2433 sx_assert(&allprison_lock, SX_LOCKED); 2434 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2435 if (pr->pr_id == prid) { 2436 mtx_lock(&pr->pr_mtx); 2437 if (pr->pr_ref > 0) 2438 return (pr); 2439 mtx_unlock(&pr->pr_mtx); 2440 } 2441 } 2442 return (NULL); 2443 } 2444 2445 /* 2446 * Look for the name relative to mypr. Returns a locked prison or NULL. 2447 */ 2448 struct prison * 2449 prison_find_name(struct prison *mypr, const char *name) 2450 { 2451 struct prison *pr, *deadpr; 2452 size_t mylen; 2453 int descend; 2454 2455 sx_assert(&allprison_lock, SX_LOCKED); 2456 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2457 again: 2458 deadpr = NULL; 2459 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2460 if (!strcmp(pr->pr_name + mylen, name)) { 2461 mtx_lock(&pr->pr_mtx); 2462 if (pr->pr_ref > 0) { 2463 if (pr->pr_uref > 0) 2464 return (pr); 2465 deadpr = pr; 2466 } 2467 mtx_unlock(&pr->pr_mtx); 2468 } 2469 } 2470 /* There was no valid prison - perhaps there was a dying one. */ 2471 if (deadpr != NULL) { 2472 mtx_lock(&deadpr->pr_mtx); 2473 if (deadpr->pr_ref == 0) { 2474 mtx_unlock(&deadpr->pr_mtx); 2475 goto again; 2476 } 2477 } 2478 return (deadpr); 2479 } 2480 2481 /* 2482 * See if a prison has the specific flag set. 2483 */ 2484 int 2485 prison_flag(struct ucred *cred, unsigned flag) 2486 { 2487 2488 /* This is an atomic read, so no locking is necessary. */ 2489 return (cred->cr_prison->pr_flags & flag); 2490 } 2491 2492 int 2493 prison_allow(struct ucred *cred, unsigned flag) 2494 { 2495 2496 /* This is an atomic read, so no locking is necessary. */ 2497 return (cred->cr_prison->pr_allow & flag); 2498 } 2499 2500 /* 2501 * Remove a prison reference. If that was the last reference, remove the 2502 * prison itself - but not in this context in case there are locks held. 2503 */ 2504 void 2505 prison_free_locked(struct prison *pr) 2506 { 2507 2508 mtx_assert(&pr->pr_mtx, MA_OWNED); 2509 pr->pr_ref--; 2510 if (pr->pr_ref == 0) { 2511 mtx_unlock(&pr->pr_mtx); 2512 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2513 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2514 return; 2515 } 2516 mtx_unlock(&pr->pr_mtx); 2517 } 2518 2519 void 2520 prison_free(struct prison *pr) 2521 { 2522 2523 mtx_lock(&pr->pr_mtx); 2524 prison_free_locked(pr); 2525 } 2526 2527 static void 2528 prison_complete(void *context, int pending) 2529 { 2530 2531 prison_deref((struct prison *)context, 0); 2532 } 2533 2534 /* 2535 * Remove a prison reference (usually). This internal version assumes no 2536 * mutexes are held, except perhaps the prison itself. If there are no more 2537 * references, release and delist the prison. On completion, the prison lock 2538 * and the allprison lock are both unlocked. 2539 */ 2540 static void 2541 prison_deref(struct prison *pr, int flags) 2542 { 2543 struct prison *ppr, *tpr; 2544 2545 if (!(flags & PD_LOCKED)) 2546 mtx_lock(&pr->pr_mtx); 2547 for (;;) { 2548 if (flags & PD_DEUREF) { 2549 pr->pr_uref--; 2550 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2551 } 2552 if (flags & PD_DEREF) 2553 pr->pr_ref--; 2554 /* If the prison still has references, nothing else to do. */ 2555 if (pr->pr_ref > 0) { 2556 mtx_unlock(&pr->pr_mtx); 2557 if (flags & PD_LIST_SLOCKED) 2558 sx_sunlock(&allprison_lock); 2559 else if (flags & PD_LIST_XLOCKED) 2560 sx_xunlock(&allprison_lock); 2561 return; 2562 } 2563 2564 mtx_unlock(&pr->pr_mtx); 2565 if (flags & PD_LIST_SLOCKED) { 2566 if (!sx_try_upgrade(&allprison_lock)) { 2567 sx_sunlock(&allprison_lock); 2568 sx_xlock(&allprison_lock); 2569 } 2570 } else if (!(flags & PD_LIST_XLOCKED)) 2571 sx_xlock(&allprison_lock); 2572 2573 TAILQ_REMOVE(&allprison, pr, pr_list); 2574 LIST_REMOVE(pr, pr_sibling); 2575 ppr = pr->pr_parent; 2576 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2577 tpr->pr_childcount--; 2578 sx_xunlock(&allprison_lock); 2579 2580 #ifdef VIMAGE 2581 if (pr->pr_vnet != ppr->pr_vnet) 2582 vnet_destroy(pr->pr_vnet); 2583 #endif 2584 if (pr->pr_root != NULL) 2585 vrele(pr->pr_root); 2586 mtx_destroy(&pr->pr_mtx); 2587 #ifdef INET 2588 free(pr->pr_ip4, M_PRISON); 2589 #endif 2590 #ifdef INET6 2591 free(pr->pr_ip6, M_PRISON); 2592 #endif 2593 if (pr->pr_cpuset != NULL) 2594 cpuset_rel(pr->pr_cpuset); 2595 osd_jail_exit(pr); 2596 #ifdef RACCT 2597 prison_racct_detach(pr); 2598 #endif 2599 free(pr, M_PRISON); 2600 2601 /* Removing a prison frees a reference on its parent. */ 2602 pr = ppr; 2603 mtx_lock(&pr->pr_mtx); 2604 flags = PD_DEREF | PD_DEUREF; 2605 } 2606 } 2607 2608 void 2609 prison_hold_locked(struct prison *pr) 2610 { 2611 2612 mtx_assert(&pr->pr_mtx, MA_OWNED); 2613 KASSERT(pr->pr_ref > 0, 2614 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2615 pr->pr_ref++; 2616 } 2617 2618 void 2619 prison_hold(struct prison *pr) 2620 { 2621 2622 mtx_lock(&pr->pr_mtx); 2623 prison_hold_locked(pr); 2624 mtx_unlock(&pr->pr_mtx); 2625 } 2626 2627 void 2628 prison_proc_hold(struct prison *pr) 2629 { 2630 2631 mtx_lock(&pr->pr_mtx); 2632 KASSERT(pr->pr_uref > 0, 2633 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2634 pr->pr_uref++; 2635 mtx_unlock(&pr->pr_mtx); 2636 } 2637 2638 void 2639 prison_proc_free(struct prison *pr) 2640 { 2641 2642 mtx_lock(&pr->pr_mtx); 2643 KASSERT(pr->pr_uref > 0, 2644 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2645 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2646 } 2647 2648 2649 #ifdef INET 2650 /* 2651 * Restrict a prison's IP address list with its parent's, possibly replacing 2652 * it. Return true if the replacement buffer was used (or would have been). 2653 */ 2654 static int 2655 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2656 { 2657 int ii, ij, used; 2658 struct prison *ppr; 2659 2660 ppr = pr->pr_parent; 2661 if (!(pr->pr_flags & PR_IP4_USER)) { 2662 /* This has no user settings, so just copy the parent's list. */ 2663 if (pr->pr_ip4s < ppr->pr_ip4s) { 2664 /* 2665 * There's no room for the parent's list. Use the 2666 * new list buffer, which is assumed to be big enough 2667 * (if it was passed). If there's no buffer, try to 2668 * allocate one. 2669 */ 2670 used = 1; 2671 if (newip4 == NULL) { 2672 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2673 M_PRISON, M_NOWAIT); 2674 if (newip4 != NULL) 2675 used = 0; 2676 } 2677 if (newip4 != NULL) { 2678 bcopy(ppr->pr_ip4, newip4, 2679 ppr->pr_ip4s * sizeof(*newip4)); 2680 free(pr->pr_ip4, M_PRISON); 2681 pr->pr_ip4 = newip4; 2682 pr->pr_ip4s = ppr->pr_ip4s; 2683 } 2684 return (used); 2685 } 2686 pr->pr_ip4s = ppr->pr_ip4s; 2687 if (pr->pr_ip4s > 0) 2688 bcopy(ppr->pr_ip4, pr->pr_ip4, 2689 pr->pr_ip4s * sizeof(*newip4)); 2690 else if (pr->pr_ip4 != NULL) { 2691 free(pr->pr_ip4, M_PRISON); 2692 pr->pr_ip4 = NULL; 2693 } 2694 } else if (pr->pr_ip4s > 0) { 2695 /* Remove addresses that aren't in the parent. */ 2696 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2697 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2698 break; 2699 if (ij < ppr->pr_ip4s) 2700 ii = 1; 2701 else { 2702 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2703 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2704 ii = 0; 2705 } 2706 for (ij = 1; ii < pr->pr_ip4s; ) { 2707 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2708 ii++; 2709 continue; 2710 } 2711 switch (ij >= ppr->pr_ip4s ? -1 : 2712 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2713 case -1: 2714 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2715 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2716 break; 2717 case 0: 2718 ii++; 2719 ij++; 2720 break; 2721 case 1: 2722 ij++; 2723 break; 2724 } 2725 } 2726 if (pr->pr_ip4s == 0) { 2727 pr->pr_flags |= PR_IP4_DISABLE; 2728 free(pr->pr_ip4, M_PRISON); 2729 pr->pr_ip4 = NULL; 2730 } 2731 } 2732 return (0); 2733 } 2734 2735 /* 2736 * Pass back primary IPv4 address of this jail. 2737 * 2738 * If not restricted return success but do not alter the address. Caller has 2739 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2740 * 2741 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2742 * Address returned in NBO. 2743 */ 2744 int 2745 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2746 { 2747 struct prison *pr; 2748 2749 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2750 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2751 2752 pr = cred->cr_prison; 2753 if (!(pr->pr_flags & PR_IP4)) 2754 return (0); 2755 mtx_lock(&pr->pr_mtx); 2756 if (!(pr->pr_flags & PR_IP4)) { 2757 mtx_unlock(&pr->pr_mtx); 2758 return (0); 2759 } 2760 if (pr->pr_ip4 == NULL) { 2761 mtx_unlock(&pr->pr_mtx); 2762 return (EAFNOSUPPORT); 2763 } 2764 2765 ia->s_addr = pr->pr_ip4[0].s_addr; 2766 mtx_unlock(&pr->pr_mtx); 2767 return (0); 2768 } 2769 2770 /* 2771 * Return 1 if we should do proper source address selection or are not jailed. 2772 * We will return 0 if we should bypass source address selection in favour 2773 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2774 * returned in NBO. 2775 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2776 */ 2777 int 2778 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2779 { 2780 struct prison *pr; 2781 struct in_addr lia; 2782 int error; 2783 2784 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2785 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2786 2787 if (!jailed(cred)) 2788 return (1); 2789 2790 pr = cred->cr_prison; 2791 if (pr->pr_flags & PR_IP4_SADDRSEL) 2792 return (1); 2793 2794 lia.s_addr = INADDR_ANY; 2795 error = prison_get_ip4(cred, &lia); 2796 if (error) 2797 return (error); 2798 if (lia.s_addr == INADDR_ANY) 2799 return (1); 2800 2801 ia->s_addr = lia.s_addr; 2802 return (0); 2803 } 2804 2805 /* 2806 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2807 */ 2808 int 2809 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2810 { 2811 2812 if (pr1 == pr2) 2813 return (1); 2814 2815 /* 2816 * No need to lock since the PR_IP4_USER flag can't be altered for 2817 * existing prisons. 2818 */ 2819 while (pr1 != &prison0 && 2820 #ifdef VIMAGE 2821 !(pr1->pr_flags & PR_VNET) && 2822 #endif 2823 !(pr1->pr_flags & PR_IP4_USER)) 2824 pr1 = pr1->pr_parent; 2825 while (pr2 != &prison0 && 2826 #ifdef VIMAGE 2827 !(pr2->pr_flags & PR_VNET) && 2828 #endif 2829 !(pr2->pr_flags & PR_IP4_USER)) 2830 pr2 = pr2->pr_parent; 2831 return (pr1 == pr2); 2832 } 2833 2834 /* 2835 * Make sure our (source) address is set to something meaningful to this 2836 * jail. 2837 * 2838 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2839 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2840 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2841 */ 2842 int 2843 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2844 { 2845 struct prison *pr; 2846 struct in_addr ia0; 2847 int error; 2848 2849 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2850 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2851 2852 pr = cred->cr_prison; 2853 if (!(pr->pr_flags & PR_IP4)) 2854 return (0); 2855 mtx_lock(&pr->pr_mtx); 2856 if (!(pr->pr_flags & PR_IP4)) { 2857 mtx_unlock(&pr->pr_mtx); 2858 return (0); 2859 } 2860 if (pr->pr_ip4 == NULL) { 2861 mtx_unlock(&pr->pr_mtx); 2862 return (EAFNOSUPPORT); 2863 } 2864 2865 ia0.s_addr = ntohl(ia->s_addr); 2866 if (ia0.s_addr == INADDR_LOOPBACK) { 2867 ia->s_addr = pr->pr_ip4[0].s_addr; 2868 mtx_unlock(&pr->pr_mtx); 2869 return (0); 2870 } 2871 2872 if (ia0.s_addr == INADDR_ANY) { 2873 /* 2874 * In case there is only 1 IPv4 address, bind directly. 2875 */ 2876 if (pr->pr_ip4s == 1) 2877 ia->s_addr = pr->pr_ip4[0].s_addr; 2878 mtx_unlock(&pr->pr_mtx); 2879 return (0); 2880 } 2881 2882 error = _prison_check_ip4(pr, ia); 2883 mtx_unlock(&pr->pr_mtx); 2884 return (error); 2885 } 2886 2887 /* 2888 * Rewrite destination address in case we will connect to loopback address. 2889 * 2890 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2891 * Address passed in in NBO and returned in NBO. 2892 */ 2893 int 2894 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2895 { 2896 struct prison *pr; 2897 2898 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2899 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2900 2901 pr = cred->cr_prison; 2902 if (!(pr->pr_flags & PR_IP4)) 2903 return (0); 2904 mtx_lock(&pr->pr_mtx); 2905 if (!(pr->pr_flags & PR_IP4)) { 2906 mtx_unlock(&pr->pr_mtx); 2907 return (0); 2908 } 2909 if (pr->pr_ip4 == NULL) { 2910 mtx_unlock(&pr->pr_mtx); 2911 return (EAFNOSUPPORT); 2912 } 2913 2914 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2915 ia->s_addr = pr->pr_ip4[0].s_addr; 2916 mtx_unlock(&pr->pr_mtx); 2917 return (0); 2918 } 2919 2920 /* 2921 * Return success because nothing had to be changed. 2922 */ 2923 mtx_unlock(&pr->pr_mtx); 2924 return (0); 2925 } 2926 2927 /* 2928 * Check if given address belongs to the jail referenced by cred/prison. 2929 * 2930 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2931 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2932 * doesn't allow IPv4. Address passed in in NBO. 2933 */ 2934 static int 2935 _prison_check_ip4(const struct prison *pr, const struct in_addr *ia) 2936 { 2937 int i, a, z, d; 2938 2939 /* 2940 * Check the primary IP. 2941 */ 2942 if (pr->pr_ip4[0].s_addr == ia->s_addr) 2943 return (0); 2944 2945 /* 2946 * All the other IPs are sorted so we can do a binary search. 2947 */ 2948 a = 0; 2949 z = pr->pr_ip4s - 2; 2950 while (a <= z) { 2951 i = (a + z) / 2; 2952 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 2953 if (d > 0) 2954 z = i - 1; 2955 else if (d < 0) 2956 a = i + 1; 2957 else 2958 return (0); 2959 } 2960 2961 return (EADDRNOTAVAIL); 2962 } 2963 2964 int 2965 prison_check_ip4(const struct ucred *cred, const struct in_addr *ia) 2966 { 2967 struct prison *pr; 2968 int error; 2969 2970 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2971 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2972 2973 pr = cred->cr_prison; 2974 if (!(pr->pr_flags & PR_IP4)) 2975 return (0); 2976 mtx_lock(&pr->pr_mtx); 2977 if (!(pr->pr_flags & PR_IP4)) { 2978 mtx_unlock(&pr->pr_mtx); 2979 return (0); 2980 } 2981 if (pr->pr_ip4 == NULL) { 2982 mtx_unlock(&pr->pr_mtx); 2983 return (EAFNOSUPPORT); 2984 } 2985 2986 error = _prison_check_ip4(pr, ia); 2987 mtx_unlock(&pr->pr_mtx); 2988 return (error); 2989 } 2990 #endif 2991 2992 #ifdef INET6 2993 static int 2994 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 2995 { 2996 int ii, ij, used; 2997 struct prison *ppr; 2998 2999 ppr = pr->pr_parent; 3000 if (!(pr->pr_flags & PR_IP6_USER)) { 3001 /* This has no user settings, so just copy the parent's list. */ 3002 if (pr->pr_ip6s < ppr->pr_ip6s) { 3003 /* 3004 * There's no room for the parent's list. Use the 3005 * new list buffer, which is assumed to be big enough 3006 * (if it was passed). If there's no buffer, try to 3007 * allocate one. 3008 */ 3009 used = 1; 3010 if (newip6 == NULL) { 3011 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 3012 M_PRISON, M_NOWAIT); 3013 if (newip6 != NULL) 3014 used = 0; 3015 } 3016 if (newip6 != NULL) { 3017 bcopy(ppr->pr_ip6, newip6, 3018 ppr->pr_ip6s * sizeof(*newip6)); 3019 free(pr->pr_ip6, M_PRISON); 3020 pr->pr_ip6 = newip6; 3021 pr->pr_ip6s = ppr->pr_ip6s; 3022 } 3023 return (used); 3024 } 3025 pr->pr_ip6s = ppr->pr_ip6s; 3026 if (pr->pr_ip6s > 0) 3027 bcopy(ppr->pr_ip6, pr->pr_ip6, 3028 pr->pr_ip6s * sizeof(*newip6)); 3029 else if (pr->pr_ip6 != NULL) { 3030 free(pr->pr_ip6, M_PRISON); 3031 pr->pr_ip6 = NULL; 3032 } 3033 } else if (pr->pr_ip6s > 0) { 3034 /* Remove addresses that aren't in the parent. */ 3035 for (ij = 0; ij < ppr->pr_ip6s; ij++) 3036 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 3037 &ppr->pr_ip6[ij])) 3038 break; 3039 if (ij < ppr->pr_ip6s) 3040 ii = 1; 3041 else { 3042 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 3043 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 3044 ii = 0; 3045 } 3046 for (ij = 1; ii < pr->pr_ip6s; ) { 3047 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 3048 &ppr->pr_ip6[0])) { 3049 ii++; 3050 continue; 3051 } 3052 switch (ij >= ppr->pr_ip6s ? -1 : 3053 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 3054 case -1: 3055 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 3056 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 3057 break; 3058 case 0: 3059 ii++; 3060 ij++; 3061 break; 3062 case 1: 3063 ij++; 3064 break; 3065 } 3066 } 3067 if (pr->pr_ip6s == 0) { 3068 pr->pr_flags |= PR_IP6_DISABLE; 3069 free(pr->pr_ip6, M_PRISON); 3070 pr->pr_ip6 = NULL; 3071 } 3072 } 3073 return 0; 3074 } 3075 3076 /* 3077 * Pass back primary IPv6 address for this jail. 3078 * 3079 * If not restricted return success but do not alter the address. Caller has 3080 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3081 * 3082 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3083 */ 3084 int 3085 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3086 { 3087 struct prison *pr; 3088 3089 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3090 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3091 3092 pr = cred->cr_prison; 3093 if (!(pr->pr_flags & PR_IP6)) 3094 return (0); 3095 mtx_lock(&pr->pr_mtx); 3096 if (!(pr->pr_flags & PR_IP6)) { 3097 mtx_unlock(&pr->pr_mtx); 3098 return (0); 3099 } 3100 if (pr->pr_ip6 == NULL) { 3101 mtx_unlock(&pr->pr_mtx); 3102 return (EAFNOSUPPORT); 3103 } 3104 3105 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3106 mtx_unlock(&pr->pr_mtx); 3107 return (0); 3108 } 3109 3110 /* 3111 * Return 1 if we should do proper source address selection or are not jailed. 3112 * We will return 0 if we should bypass source address selection in favour 3113 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3114 * returned in NBO. 3115 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3116 */ 3117 int 3118 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3119 { 3120 struct prison *pr; 3121 struct in6_addr lia6; 3122 int error; 3123 3124 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3125 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3126 3127 if (!jailed(cred)) 3128 return (1); 3129 3130 pr = cred->cr_prison; 3131 if (pr->pr_flags & PR_IP6_SADDRSEL) 3132 return (1); 3133 3134 lia6 = in6addr_any; 3135 error = prison_get_ip6(cred, &lia6); 3136 if (error) 3137 return (error); 3138 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3139 return (1); 3140 3141 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3142 return (0); 3143 } 3144 3145 /* 3146 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3147 */ 3148 int 3149 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3150 { 3151 3152 if (pr1 == pr2) 3153 return (1); 3154 3155 while (pr1 != &prison0 && 3156 #ifdef VIMAGE 3157 !(pr1->pr_flags & PR_VNET) && 3158 #endif 3159 !(pr1->pr_flags & PR_IP6_USER)) 3160 pr1 = pr1->pr_parent; 3161 while (pr2 != &prison0 && 3162 #ifdef VIMAGE 3163 !(pr2->pr_flags & PR_VNET) && 3164 #endif 3165 !(pr2->pr_flags & PR_IP6_USER)) 3166 pr2 = pr2->pr_parent; 3167 return (pr1 == pr2); 3168 } 3169 3170 /* 3171 * Make sure our (source) address is set to something meaningful to this jail. 3172 * 3173 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3174 * when needed while binding. 3175 * 3176 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3177 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3178 * doesn't allow IPv6. 3179 */ 3180 int 3181 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3182 { 3183 struct prison *pr; 3184 int error; 3185 3186 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3187 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3188 3189 pr = cred->cr_prison; 3190 if (!(pr->pr_flags & PR_IP6)) 3191 return (0); 3192 mtx_lock(&pr->pr_mtx); 3193 if (!(pr->pr_flags & PR_IP6)) { 3194 mtx_unlock(&pr->pr_mtx); 3195 return (0); 3196 } 3197 if (pr->pr_ip6 == NULL) { 3198 mtx_unlock(&pr->pr_mtx); 3199 return (EAFNOSUPPORT); 3200 } 3201 3202 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3203 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3204 mtx_unlock(&pr->pr_mtx); 3205 return (0); 3206 } 3207 3208 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3209 /* 3210 * In case there is only 1 IPv6 address, and v6only is true, 3211 * then bind directly. 3212 */ 3213 if (v6only != 0 && pr->pr_ip6s == 1) 3214 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3215 mtx_unlock(&pr->pr_mtx); 3216 return (0); 3217 } 3218 3219 error = _prison_check_ip6(pr, ia6); 3220 mtx_unlock(&pr->pr_mtx); 3221 return (error); 3222 } 3223 3224 /* 3225 * Rewrite destination address in case we will connect to loopback address. 3226 * 3227 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3228 */ 3229 int 3230 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3231 { 3232 struct prison *pr; 3233 3234 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3235 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3236 3237 pr = cred->cr_prison; 3238 if (!(pr->pr_flags & PR_IP6)) 3239 return (0); 3240 mtx_lock(&pr->pr_mtx); 3241 if (!(pr->pr_flags & PR_IP6)) { 3242 mtx_unlock(&pr->pr_mtx); 3243 return (0); 3244 } 3245 if (pr->pr_ip6 == NULL) { 3246 mtx_unlock(&pr->pr_mtx); 3247 return (EAFNOSUPPORT); 3248 } 3249 3250 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3251 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3252 mtx_unlock(&pr->pr_mtx); 3253 return (0); 3254 } 3255 3256 /* 3257 * Return success because nothing had to be changed. 3258 */ 3259 mtx_unlock(&pr->pr_mtx); 3260 return (0); 3261 } 3262 3263 /* 3264 * Check if given address belongs to the jail referenced by cred/prison. 3265 * 3266 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3267 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3268 * doesn't allow IPv6. 3269 */ 3270 static int 3271 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3272 { 3273 int i, a, z, d; 3274 3275 /* 3276 * Check the primary IP. 3277 */ 3278 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3279 return (0); 3280 3281 /* 3282 * All the other IPs are sorted so we can do a binary search. 3283 */ 3284 a = 0; 3285 z = pr->pr_ip6s - 2; 3286 while (a <= z) { 3287 i = (a + z) / 2; 3288 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3289 if (d > 0) 3290 z = i - 1; 3291 else if (d < 0) 3292 a = i + 1; 3293 else 3294 return (0); 3295 } 3296 3297 return (EADDRNOTAVAIL); 3298 } 3299 3300 int 3301 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3302 { 3303 struct prison *pr; 3304 int error; 3305 3306 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3307 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3308 3309 pr = cred->cr_prison; 3310 if (!(pr->pr_flags & PR_IP6)) 3311 return (0); 3312 mtx_lock(&pr->pr_mtx); 3313 if (!(pr->pr_flags & PR_IP6)) { 3314 mtx_unlock(&pr->pr_mtx); 3315 return (0); 3316 } 3317 if (pr->pr_ip6 == NULL) { 3318 mtx_unlock(&pr->pr_mtx); 3319 return (EAFNOSUPPORT); 3320 } 3321 3322 error = _prison_check_ip6(pr, ia6); 3323 mtx_unlock(&pr->pr_mtx); 3324 return (error); 3325 } 3326 #endif 3327 3328 /* 3329 * Check if a jail supports the given address family. 3330 * 3331 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3332 * if not. 3333 */ 3334 int 3335 prison_check_af(struct ucred *cred, int af) 3336 { 3337 struct prison *pr; 3338 int error; 3339 3340 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3341 3342 pr = cred->cr_prison; 3343 #ifdef VIMAGE 3344 /* Prisons with their own network stack are not limited. */ 3345 if (prison_owns_vnet(cred)) 3346 return (0); 3347 #endif 3348 3349 error = 0; 3350 switch (af) 3351 { 3352 #ifdef INET 3353 case AF_INET: 3354 if (pr->pr_flags & PR_IP4) 3355 { 3356 mtx_lock(&pr->pr_mtx); 3357 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3358 error = EAFNOSUPPORT; 3359 mtx_unlock(&pr->pr_mtx); 3360 } 3361 break; 3362 #endif 3363 #ifdef INET6 3364 case AF_INET6: 3365 if (pr->pr_flags & PR_IP6) 3366 { 3367 mtx_lock(&pr->pr_mtx); 3368 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3369 error = EAFNOSUPPORT; 3370 mtx_unlock(&pr->pr_mtx); 3371 } 3372 break; 3373 #endif 3374 case AF_LOCAL: 3375 case AF_ROUTE: 3376 break; 3377 default: 3378 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3379 error = EAFNOSUPPORT; 3380 } 3381 return (error); 3382 } 3383 3384 /* 3385 * Check if given address belongs to the jail referenced by cred (wrapper to 3386 * prison_check_ip[46]). 3387 * 3388 * Returns 0 if jail doesn't restrict the address family or if address belongs 3389 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3390 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3391 */ 3392 int 3393 prison_if(struct ucred *cred, struct sockaddr *sa) 3394 { 3395 #ifdef INET 3396 struct sockaddr_in *sai; 3397 #endif 3398 #ifdef INET6 3399 struct sockaddr_in6 *sai6; 3400 #endif 3401 int error; 3402 3403 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3404 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3405 3406 #ifdef VIMAGE 3407 if (prison_owns_vnet(cred)) 3408 return (0); 3409 #endif 3410 3411 error = 0; 3412 switch (sa->sa_family) 3413 { 3414 #ifdef INET 3415 case AF_INET: 3416 sai = (struct sockaddr_in *)sa; 3417 error = prison_check_ip4(cred, &sai->sin_addr); 3418 break; 3419 #endif 3420 #ifdef INET6 3421 case AF_INET6: 3422 sai6 = (struct sockaddr_in6 *)sa; 3423 error = prison_check_ip6(cred, &sai6->sin6_addr); 3424 break; 3425 #endif 3426 default: 3427 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3428 error = EAFNOSUPPORT; 3429 } 3430 return (error); 3431 } 3432 3433 /* 3434 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3435 */ 3436 int 3437 prison_check(struct ucred *cred1, struct ucred *cred2) 3438 { 3439 3440 return ((cred1->cr_prison == cred2->cr_prison || 3441 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3442 } 3443 3444 /* 3445 * Return 1 if p2 is a child of p1, otherwise 0. 3446 */ 3447 int 3448 prison_ischild(struct prison *pr1, struct prison *pr2) 3449 { 3450 3451 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3452 if (pr1 == pr2) 3453 return (1); 3454 return (0); 3455 } 3456 3457 /* 3458 * Return 1 if the passed credential is in a jail, otherwise 0. 3459 */ 3460 int 3461 jailed(struct ucred *cred) 3462 { 3463 3464 return (cred->cr_prison != &prison0); 3465 } 3466 3467 /* 3468 * Return 1 if the passed credential is in a jail and that jail does not 3469 * have its own virtual network stack, otherwise 0. 3470 */ 3471 int 3472 jailed_without_vnet(struct ucred *cred) 3473 { 3474 3475 if (!jailed(cred)) 3476 return (0); 3477 #ifdef VIMAGE 3478 if (prison_owns_vnet(cred)) 3479 return (0); 3480 #endif 3481 3482 return (1); 3483 } 3484 3485 /* 3486 * Return the correct hostname (domainname, et al) for the passed credential. 3487 */ 3488 void 3489 getcredhostname(struct ucred *cred, char *buf, size_t size) 3490 { 3491 struct prison *pr; 3492 3493 /* 3494 * A NULL credential can be used to shortcut to the physical 3495 * system's hostname. 3496 */ 3497 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3498 mtx_lock(&pr->pr_mtx); 3499 strlcpy(buf, pr->pr_hostname, size); 3500 mtx_unlock(&pr->pr_mtx); 3501 } 3502 3503 void 3504 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3505 { 3506 3507 mtx_lock(&cred->cr_prison->pr_mtx); 3508 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3509 mtx_unlock(&cred->cr_prison->pr_mtx); 3510 } 3511 3512 void 3513 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3514 { 3515 3516 mtx_lock(&cred->cr_prison->pr_mtx); 3517 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3518 mtx_unlock(&cred->cr_prison->pr_mtx); 3519 } 3520 3521 void 3522 getcredhostid(struct ucred *cred, unsigned long *hostid) 3523 { 3524 3525 mtx_lock(&cred->cr_prison->pr_mtx); 3526 *hostid = cred->cr_prison->pr_hostid; 3527 mtx_unlock(&cred->cr_prison->pr_mtx); 3528 } 3529 3530 #ifdef VIMAGE 3531 /* 3532 * Determine whether the prison represented by cred owns 3533 * its vnet rather than having it inherited. 3534 * 3535 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3536 */ 3537 int 3538 prison_owns_vnet(struct ucred *cred) 3539 { 3540 3541 /* 3542 * vnets cannot be added/removed after jail creation, 3543 * so no need to lock here. 3544 */ 3545 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3546 } 3547 #endif 3548 3549 /* 3550 * Determine whether the subject represented by cred can "see" 3551 * status of a mount point. 3552 * Returns: 0 for permitted, ENOENT otherwise. 3553 * XXX: This function should be called cr_canseemount() and should be 3554 * placed in kern_prot.c. 3555 */ 3556 int 3557 prison_canseemount(struct ucred *cred, struct mount *mp) 3558 { 3559 struct prison *pr; 3560 struct statfs *sp; 3561 size_t len; 3562 3563 pr = cred->cr_prison; 3564 if (pr->pr_enforce_statfs == 0) 3565 return (0); 3566 if (pr->pr_root->v_mount == mp) 3567 return (0); 3568 if (pr->pr_enforce_statfs == 2) 3569 return (ENOENT); 3570 /* 3571 * If jail's chroot directory is set to "/" we should be able to see 3572 * all mount-points from inside a jail. 3573 * This is ugly check, but this is the only situation when jail's 3574 * directory ends with '/'. 3575 */ 3576 if (strcmp(pr->pr_path, "/") == 0) 3577 return (0); 3578 len = strlen(pr->pr_path); 3579 sp = &mp->mnt_stat; 3580 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3581 return (ENOENT); 3582 /* 3583 * Be sure that we don't have situation where jail's root directory 3584 * is "/some/path" and mount point is "/some/pathpath". 3585 */ 3586 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3587 return (ENOENT); 3588 return (0); 3589 } 3590 3591 void 3592 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3593 { 3594 char jpath[MAXPATHLEN]; 3595 struct prison *pr; 3596 size_t len; 3597 3598 pr = cred->cr_prison; 3599 if (pr->pr_enforce_statfs == 0) 3600 return; 3601 if (prison_canseemount(cred, mp) != 0) { 3602 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3603 strlcpy(sp->f_mntonname, "[restricted]", 3604 sizeof(sp->f_mntonname)); 3605 return; 3606 } 3607 if (pr->pr_root->v_mount == mp) { 3608 /* 3609 * Clear current buffer data, so we are sure nothing from 3610 * the valid path left there. 3611 */ 3612 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3613 *sp->f_mntonname = '/'; 3614 return; 3615 } 3616 /* 3617 * If jail's chroot directory is set to "/" we should be able to see 3618 * all mount-points from inside a jail. 3619 */ 3620 if (strcmp(pr->pr_path, "/") == 0) 3621 return; 3622 len = strlen(pr->pr_path); 3623 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3624 /* 3625 * Clear current buffer data, so we are sure nothing from 3626 * the valid path left there. 3627 */ 3628 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3629 if (*jpath == '\0') { 3630 /* Should never happen. */ 3631 *sp->f_mntonname = '/'; 3632 } else { 3633 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3634 } 3635 } 3636 3637 /* 3638 * Check with permission for a specific privilege is granted within jail. We 3639 * have a specific list of accepted privileges; the rest are denied. 3640 */ 3641 int 3642 prison_priv_check(struct ucred *cred, int priv) 3643 { 3644 3645 if (!jailed(cred)) 3646 return (0); 3647 3648 #ifdef VIMAGE 3649 /* 3650 * Privileges specific to prisons with a virtual network stack. 3651 * There might be a duplicate entry here in case the privilege 3652 * is only granted conditionally in the legacy jail case. 3653 */ 3654 switch (priv) { 3655 #ifdef notyet 3656 /* 3657 * NFS-specific privileges. 3658 */ 3659 case PRIV_NFS_DAEMON: 3660 case PRIV_NFS_LOCKD: 3661 #endif 3662 /* 3663 * Network stack privileges. 3664 */ 3665 case PRIV_NET_BRIDGE: 3666 case PRIV_NET_GRE: 3667 case PRIV_NET_BPF: 3668 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3669 case PRIV_NET_ROUTE: 3670 case PRIV_NET_TAP: 3671 case PRIV_NET_SETIFMTU: 3672 case PRIV_NET_SETIFFLAGS: 3673 case PRIV_NET_SETIFCAP: 3674 case PRIV_NET_SETIFDESCR: 3675 case PRIV_NET_SETIFNAME : 3676 case PRIV_NET_SETIFMETRIC: 3677 case PRIV_NET_SETIFPHYS: 3678 case PRIV_NET_SETIFMAC: 3679 case PRIV_NET_ADDMULTI: 3680 case PRIV_NET_DELMULTI: 3681 case PRIV_NET_HWIOCTL: 3682 case PRIV_NET_SETLLADDR: 3683 case PRIV_NET_ADDIFGROUP: 3684 case PRIV_NET_DELIFGROUP: 3685 case PRIV_NET_IFCREATE: 3686 case PRIV_NET_IFDESTROY: 3687 case PRIV_NET_ADDIFADDR: 3688 case PRIV_NET_DELIFADDR: 3689 case PRIV_NET_LAGG: 3690 case PRIV_NET_GIF: 3691 case PRIV_NET_SETIFVNET: 3692 case PRIV_NET_SETIFFIB: 3693 3694 /* 3695 * 802.11-related privileges. 3696 */ 3697 case PRIV_NET80211_GETKEY: 3698 #ifdef notyet 3699 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3700 #endif 3701 3702 #ifdef notyet 3703 /* 3704 * AppleTalk privileges. 3705 */ 3706 case PRIV_NETATALK_RESERVEDPORT: 3707 3708 /* 3709 * ATM privileges. 3710 */ 3711 case PRIV_NETATM_CFG: 3712 case PRIV_NETATM_ADD: 3713 case PRIV_NETATM_DEL: 3714 case PRIV_NETATM_SET: 3715 3716 /* 3717 * Bluetooth privileges. 3718 */ 3719 case PRIV_NETBLUETOOTH_RAW: 3720 #endif 3721 3722 /* 3723 * Netgraph and netgraph module privileges. 3724 */ 3725 case PRIV_NETGRAPH_CONTROL: 3726 #ifdef notyet 3727 case PRIV_NETGRAPH_TTY: 3728 #endif 3729 3730 /* 3731 * IPv4 and IPv6 privileges. 3732 */ 3733 case PRIV_NETINET_IPFW: 3734 case PRIV_NETINET_DIVERT: 3735 case PRIV_NETINET_PF: 3736 case PRIV_NETINET_DUMMYNET: 3737 case PRIV_NETINET_CARP: 3738 case PRIV_NETINET_MROUTE: 3739 case PRIV_NETINET_RAW: 3740 case PRIV_NETINET_ADDRCTRL6: 3741 case PRIV_NETINET_ND6: 3742 case PRIV_NETINET_SCOPE6: 3743 case PRIV_NETINET_ALIFETIME6: 3744 case PRIV_NETINET_IPSEC: 3745 case PRIV_NETINET_BINDANY: 3746 3747 #ifdef notyet 3748 /* 3749 * IPX/SPX privileges. 3750 */ 3751 case PRIV_NETIPX_RESERVEDPORT: 3752 case PRIV_NETIPX_RAW: 3753 3754 /* 3755 * NCP privileges. 3756 */ 3757 case PRIV_NETNCP: 3758 3759 /* 3760 * SMB privileges. 3761 */ 3762 case PRIV_NETSMB: 3763 #endif 3764 3765 /* 3766 * No default: or deny here. 3767 * In case of no permit fall through to next switch(). 3768 */ 3769 if (cred->cr_prison->pr_flags & PR_VNET) 3770 return (0); 3771 } 3772 #endif /* VIMAGE */ 3773 3774 switch (priv) { 3775 3776 /* 3777 * Allow ktrace privileges for root in jail. 3778 */ 3779 case PRIV_KTRACE: 3780 3781 #if 0 3782 /* 3783 * Allow jailed processes to configure audit identity and 3784 * submit audit records (login, etc). In the future we may 3785 * want to further refine the relationship between audit and 3786 * jail. 3787 */ 3788 case PRIV_AUDIT_GETAUDIT: 3789 case PRIV_AUDIT_SETAUDIT: 3790 case PRIV_AUDIT_SUBMIT: 3791 #endif 3792 3793 /* 3794 * Allow jailed processes to manipulate process UNIX 3795 * credentials in any way they see fit. 3796 */ 3797 case PRIV_CRED_SETUID: 3798 case PRIV_CRED_SETEUID: 3799 case PRIV_CRED_SETGID: 3800 case PRIV_CRED_SETEGID: 3801 case PRIV_CRED_SETGROUPS: 3802 case PRIV_CRED_SETREUID: 3803 case PRIV_CRED_SETREGID: 3804 case PRIV_CRED_SETRESUID: 3805 case PRIV_CRED_SETRESGID: 3806 3807 /* 3808 * Jail implements visibility constraints already, so allow 3809 * jailed root to override uid/gid-based constraints. 3810 */ 3811 case PRIV_SEEOTHERGIDS: 3812 case PRIV_SEEOTHERUIDS: 3813 3814 /* 3815 * Jail implements inter-process debugging limits already, so 3816 * allow jailed root various debugging privileges. 3817 */ 3818 case PRIV_DEBUG_DIFFCRED: 3819 case PRIV_DEBUG_SUGID: 3820 case PRIV_DEBUG_UNPRIV: 3821 3822 /* 3823 * Allow jail to set various resource limits and login 3824 * properties, and for now, exceed process resource limits. 3825 */ 3826 case PRIV_PROC_LIMIT: 3827 case PRIV_PROC_SETLOGIN: 3828 case PRIV_PROC_SETRLIMIT: 3829 3830 /* 3831 * System V and POSIX IPC privileges are granted in jail. 3832 */ 3833 case PRIV_IPC_READ: 3834 case PRIV_IPC_WRITE: 3835 case PRIV_IPC_ADMIN: 3836 case PRIV_IPC_MSGSIZE: 3837 case PRIV_MQ_ADMIN: 3838 3839 /* 3840 * Jail operations within a jail work on child jails. 3841 */ 3842 case PRIV_JAIL_ATTACH: 3843 case PRIV_JAIL_SET: 3844 case PRIV_JAIL_REMOVE: 3845 3846 /* 3847 * Jail implements its own inter-process limits, so allow 3848 * root processes in jail to change scheduling on other 3849 * processes in the same jail. Likewise for signalling. 3850 */ 3851 case PRIV_SCHED_DIFFCRED: 3852 case PRIV_SCHED_CPUSET: 3853 case PRIV_SIGNAL_DIFFCRED: 3854 case PRIV_SIGNAL_SUGID: 3855 3856 /* 3857 * Allow jailed processes to write to sysctls marked as jail 3858 * writable. 3859 */ 3860 case PRIV_SYSCTL_WRITEJAIL: 3861 3862 /* 3863 * Allow root in jail to manage a variety of quota 3864 * properties. These should likely be conditional on a 3865 * configuration option. 3866 */ 3867 case PRIV_VFS_GETQUOTA: 3868 case PRIV_VFS_SETQUOTA: 3869 3870 /* 3871 * Since Jail relies on chroot() to implement file system 3872 * protections, grant many VFS privileges to root in jail. 3873 * Be careful to exclude mount-related and NFS-related 3874 * privileges. 3875 */ 3876 case PRIV_VFS_READ: 3877 case PRIV_VFS_WRITE: 3878 case PRIV_VFS_ADMIN: 3879 case PRIV_VFS_EXEC: 3880 case PRIV_VFS_LOOKUP: 3881 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3882 case PRIV_VFS_CHFLAGS_DEV: 3883 case PRIV_VFS_CHOWN: 3884 case PRIV_VFS_CHROOT: 3885 case PRIV_VFS_RETAINSUGID: 3886 case PRIV_VFS_FCHROOT: 3887 case PRIV_VFS_LINK: 3888 case PRIV_VFS_SETGID: 3889 case PRIV_VFS_STAT: 3890 case PRIV_VFS_STICKYFILE: 3891 3892 /* 3893 * As in the non-jail case, non-root users are expected to be 3894 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3895 * exists in the jail and they have permission to access it). 3896 */ 3897 case PRIV_KMEM_READ: 3898 return (0); 3899 3900 /* 3901 * Depending on the global setting, allow privilege of 3902 * setting system flags. 3903 */ 3904 case PRIV_VFS_SYSFLAGS: 3905 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3906 return (0); 3907 else 3908 return (EPERM); 3909 3910 /* 3911 * Depending on the global setting, allow privilege of 3912 * mounting/unmounting file systems. 3913 */ 3914 case PRIV_VFS_MOUNT: 3915 case PRIV_VFS_UNMOUNT: 3916 case PRIV_VFS_MOUNT_NONUSER: 3917 case PRIV_VFS_MOUNT_OWNER: 3918 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3919 cred->cr_prison->pr_enforce_statfs < 2) 3920 return (0); 3921 else 3922 return (EPERM); 3923 3924 /* 3925 * Allow jailed root to bind reserved ports and reuse in-use 3926 * ports. 3927 */ 3928 case PRIV_NETINET_RESERVEDPORT: 3929 case PRIV_NETINET_REUSEPORT: 3930 return (0); 3931 3932 /* 3933 * Allow jailed root to set certian IPv4/6 (option) headers. 3934 */ 3935 case PRIV_NETINET_SETHDROPTS: 3936 return (0); 3937 3938 /* 3939 * Conditionally allow creating raw sockets in jail. 3940 */ 3941 case PRIV_NETINET_RAW: 3942 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3943 return (0); 3944 else 3945 return (EPERM); 3946 3947 /* 3948 * Since jail implements its own visibility limits on netstat 3949 * sysctls, allow getcred. This allows identd to work in 3950 * jail. 3951 */ 3952 case PRIV_NETINET_GETCRED: 3953 return (0); 3954 3955 /* 3956 * Allow access to /dev/io in a jail if the non-jailed admin 3957 * requests this and if /dev/io exists in the jail. This 3958 * allows Xorg to probe a card. 3959 */ 3960 case PRIV_IO: 3961 if (cred->cr_prison->pr_allow & PR_ALLOW_KMEM) 3962 return (0); 3963 else 3964 return (EPERM); 3965 3966 /* 3967 * Allow low level access to KMEM-like devices (e.g. to 3968 * allow Xorg to use DRI). 3969 */ 3970 case PRIV_KMEM_WRITE: 3971 if (cred->cr_prison->pr_allow & PR_ALLOW_KMEM) 3972 return (0); 3973 else 3974 return (EPERM); 3975 3976 /* 3977 * Allow jailed root to set loginclass. 3978 */ 3979 case PRIV_PROC_SETLOGINCLASS: 3980 return (0); 3981 3982 default: 3983 /* 3984 * In all remaining cases, deny the privilege request. This 3985 * includes almost all network privileges, many system 3986 * configuration privileges. 3987 */ 3988 return (EPERM); 3989 } 3990 } 3991 3992 /* 3993 * Return the part of pr2's name that is relative to pr1, or the whole name 3994 * if it does not directly follow. 3995 */ 3996 3997 char * 3998 prison_name(struct prison *pr1, struct prison *pr2) 3999 { 4000 char *name; 4001 4002 /* Jails see themselves as "0" (if they see themselves at all). */ 4003 if (pr1 == pr2) 4004 return "0"; 4005 name = pr2->pr_name; 4006 if (prison_ischild(pr1, pr2)) { 4007 /* 4008 * pr1 isn't locked (and allprison_lock may not be either) 4009 * so its length can't be counted on. But the number of dots 4010 * can be counted on - and counted. 4011 */ 4012 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 4013 name = strchr(name, '.') + 1; 4014 } 4015 return (name); 4016 } 4017 4018 /* 4019 * Return the part of pr2's path that is relative to pr1, or the whole path 4020 * if it does not directly follow. 4021 */ 4022 static char * 4023 prison_path(struct prison *pr1, struct prison *pr2) 4024 { 4025 char *path1, *path2; 4026 int len1; 4027 4028 path1 = pr1->pr_path; 4029 path2 = pr2->pr_path; 4030 if (!strcmp(path1, "/")) 4031 return (path2); 4032 len1 = strlen(path1); 4033 if (strncmp(path1, path2, len1)) 4034 return (path2); 4035 if (path2[len1] == '\0') 4036 return "/"; 4037 if (path2[len1] == '/') 4038 return (path2 + len1); 4039 return (path2); 4040 } 4041 4042 4043 /* 4044 * Jail-related sysctls. 4045 */ 4046 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 4047 "Jails"); 4048 4049 static int 4050 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4051 { 4052 struct xprison *xp; 4053 struct prison *pr, *cpr; 4054 #ifdef INET 4055 struct in_addr *ip4 = NULL; 4056 int ip4s = 0; 4057 #endif 4058 #ifdef INET6 4059 struct in6_addr *ip6 = NULL; 4060 int ip6s = 0; 4061 #endif 4062 int descend, error; 4063 4064 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4065 pr = req->td->td_ucred->cr_prison; 4066 error = 0; 4067 sx_slock(&allprison_lock); 4068 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4069 #if defined(INET) || defined(INET6) 4070 again: 4071 #endif 4072 mtx_lock(&cpr->pr_mtx); 4073 #ifdef INET 4074 if (cpr->pr_ip4s > 0) { 4075 if (ip4s < cpr->pr_ip4s) { 4076 ip4s = cpr->pr_ip4s; 4077 mtx_unlock(&cpr->pr_mtx); 4078 ip4 = realloc(ip4, ip4s * 4079 sizeof(struct in_addr), M_TEMP, M_WAITOK); 4080 goto again; 4081 } 4082 bcopy(cpr->pr_ip4, ip4, 4083 cpr->pr_ip4s * sizeof(struct in_addr)); 4084 } 4085 #endif 4086 #ifdef INET6 4087 if (cpr->pr_ip6s > 0) { 4088 if (ip6s < cpr->pr_ip6s) { 4089 ip6s = cpr->pr_ip6s; 4090 mtx_unlock(&cpr->pr_mtx); 4091 ip6 = realloc(ip6, ip6s * 4092 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 4093 goto again; 4094 } 4095 bcopy(cpr->pr_ip6, ip6, 4096 cpr->pr_ip6s * sizeof(struct in6_addr)); 4097 } 4098 #endif 4099 if (cpr->pr_ref == 0) { 4100 mtx_unlock(&cpr->pr_mtx); 4101 continue; 4102 } 4103 bzero(xp, sizeof(*xp)); 4104 xp->pr_version = XPRISON_VERSION; 4105 xp->pr_id = cpr->pr_id; 4106 xp->pr_state = cpr->pr_uref > 0 4107 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4108 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4109 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4110 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4111 #ifdef INET 4112 xp->pr_ip4s = cpr->pr_ip4s; 4113 #endif 4114 #ifdef INET6 4115 xp->pr_ip6s = cpr->pr_ip6s; 4116 #endif 4117 mtx_unlock(&cpr->pr_mtx); 4118 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4119 if (error) 4120 break; 4121 #ifdef INET 4122 if (xp->pr_ip4s > 0) { 4123 error = SYSCTL_OUT(req, ip4, 4124 xp->pr_ip4s * sizeof(struct in_addr)); 4125 if (error) 4126 break; 4127 } 4128 #endif 4129 #ifdef INET6 4130 if (xp->pr_ip6s > 0) { 4131 error = SYSCTL_OUT(req, ip6, 4132 xp->pr_ip6s * sizeof(struct in6_addr)); 4133 if (error) 4134 break; 4135 } 4136 #endif 4137 } 4138 sx_sunlock(&allprison_lock); 4139 free(xp, M_TEMP); 4140 #ifdef INET 4141 free(ip4, M_TEMP); 4142 #endif 4143 #ifdef INET6 4144 free(ip6, M_TEMP); 4145 #endif 4146 return (error); 4147 } 4148 4149 SYSCTL_OID(_security_jail, OID_AUTO, list, 4150 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4151 sysctl_jail_list, "S", "List of active jails"); 4152 4153 static int 4154 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4155 { 4156 int error, injail; 4157 4158 injail = jailed(req->td->td_ucred); 4159 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4160 4161 return (error); 4162 } 4163 4164 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4165 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4166 sysctl_jail_jailed, "I", "Process in jail?"); 4167 4168 static int 4169 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4170 { 4171 int error, havevnet; 4172 #ifdef VIMAGE 4173 struct ucred *cred = req->td->td_ucred; 4174 4175 havevnet = jailed(cred) && prison_owns_vnet(cred); 4176 #else 4177 havevnet = 0; 4178 #endif 4179 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4180 4181 return (error); 4182 } 4183 4184 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4185 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4186 sysctl_jail_vnet, "I", "Jail owns VNET?"); 4187 4188 #if defined(INET) || defined(INET6) 4189 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4190 &jail_max_af_ips, 0, 4191 "Number of IP addresses a jail may have at most per address family"); 4192 #endif 4193 4194 /* 4195 * Default parameters for jail(2) compatability. For historical reasons, 4196 * the sysctl names have varying similarity to the parameter names. Prisons 4197 * just see their own parameters, and can't change them. 4198 */ 4199 static int 4200 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4201 { 4202 struct prison *pr; 4203 int allow, error, i; 4204 4205 pr = req->td->td_ucred->cr_prison; 4206 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4207 4208 /* Get the current flag value, and convert it to a boolean. */ 4209 i = (allow & arg2) ? 1 : 0; 4210 if (arg1 != NULL) 4211 i = !i; 4212 error = sysctl_handle_int(oidp, &i, 0, req); 4213 if (error || !req->newptr) 4214 return (error); 4215 i = i ? arg2 : 0; 4216 if (arg1 != NULL) 4217 i ^= arg2; 4218 /* 4219 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4220 * for writing. 4221 */ 4222 mtx_lock(&prison0.pr_mtx); 4223 jail_default_allow = (jail_default_allow & ~arg2) | i; 4224 mtx_unlock(&prison0.pr_mtx); 4225 return (0); 4226 } 4227 4228 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4229 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4230 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4231 "Processes in jail can set their hostnames"); 4232 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4233 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4234 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4235 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 4236 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4237 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4238 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4239 "Processes in jail can use System V IPC primitives"); 4240 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4241 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4242 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4243 "Prison root can create raw sockets"); 4244 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4245 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4246 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4247 "Processes in jail can alter system file flags"); 4248 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4249 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4250 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4251 "Processes in jail can mount/unmount jail-friendly file systems"); 4252 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 4253 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4254 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 4255 "Processes in jail can mount the devfs file system"); 4256 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 4257 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4258 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 4259 "Processes in jail can mount the nullfs file system"); 4260 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 4261 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4262 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 4263 "Processes in jail can mount the procfs file system"); 4264 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed, 4265 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4266 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I", 4267 "Processes in jail can mount the tmpfs file system"); 4268 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 4269 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4270 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 4271 "Processes in jail can mount the zfs file system"); 4272 4273 static int 4274 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4275 { 4276 struct prison *pr; 4277 int level, error; 4278 4279 pr = req->td->td_ucred->cr_prison; 4280 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4281 error = sysctl_handle_int(oidp, &level, 0, req); 4282 if (error || !req->newptr) 4283 return (error); 4284 *(int *)arg1 = level; 4285 return (0); 4286 } 4287 4288 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4289 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4290 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4291 sysctl_jail_default_level, "I", 4292 "Processes in jail cannot see all mounted file systems"); 4293 4294 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4295 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4296 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4297 sysctl_jail_default_level, "I", 4298 "Ruleset for the devfs filesystem in jail"); 4299 4300 /* 4301 * Nodes to describe jail parameters. Maximum length of string parameters 4302 * is returned in the string itself, and the other parameters exist merely 4303 * to make themselves and their types known. 4304 */ 4305 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4306 "Jail parameters"); 4307 4308 int 4309 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4310 { 4311 int i; 4312 long l; 4313 size_t s; 4314 char numbuf[12]; 4315 4316 switch (oidp->oid_kind & CTLTYPE) 4317 { 4318 case CTLTYPE_LONG: 4319 case CTLTYPE_ULONG: 4320 l = 0; 4321 #ifdef SCTL_MASK32 4322 if (!(req->flags & SCTL_MASK32)) 4323 #endif 4324 return (SYSCTL_OUT(req, &l, sizeof(l))); 4325 case CTLTYPE_INT: 4326 case CTLTYPE_UINT: 4327 i = 0; 4328 return (SYSCTL_OUT(req, &i, sizeof(i))); 4329 case CTLTYPE_STRING: 4330 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4331 return 4332 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4333 case CTLTYPE_STRUCT: 4334 s = (size_t)arg2; 4335 return (SYSCTL_OUT(req, &s, sizeof(s))); 4336 } 4337 return (0); 4338 } 4339 4340 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4341 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4342 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4343 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4344 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4345 "I", "Jail secure level"); 4346 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4347 "I", "Jail cannot see all mounted file systems"); 4348 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4349 "I", "Ruleset for in-jail devfs mounts"); 4350 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4351 "B", "Jail persistence"); 4352 #ifdef VIMAGE 4353 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4354 "E,jailsys", "Virtual network stack"); 4355 #endif 4356 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4357 "B", "Jail is in the process of shutting down"); 4358 4359 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4360 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4361 "I", "Current number of child jails"); 4362 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4363 "I", "Maximum number of child jails"); 4364 4365 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4366 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4367 "Jail hostname"); 4368 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4369 "Jail NIS domainname"); 4370 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4371 "Jail host UUID"); 4372 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4373 "LU", "Jail host ID"); 4374 4375 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4376 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4377 4378 #ifdef INET 4379 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4380 "Jail IPv4 address virtualization"); 4381 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4382 "S,in_addr,a", "Jail IPv4 addresses"); 4383 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4384 "B", "Do (not) use IPv4 source address selection rather than the " 4385 "primary jail IPv4 address."); 4386 #endif 4387 #ifdef INET6 4388 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4389 "Jail IPv6 address virtualization"); 4390 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4391 "S,in6_addr,a", "Jail IPv6 addresses"); 4392 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4393 "B", "Do (not) use IPv6 source address selection rather than the " 4394 "primary jail IPv6 address."); 4395 #endif 4396 4397 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4398 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4399 "B", "Jail may set hostname"); 4400 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4401 "B", "Jail may use SYSV IPC"); 4402 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4403 "B", "Jail may create raw sockets"); 4404 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4405 "B", "Jail may alter system file flags"); 4406 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4407 "B", "Jail may set file quotas"); 4408 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4409 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4410 SYSCTL_JAIL_PARAM(_allow, kmem, CTLTYPE_INT | CTLFLAG_RW, 4411 "B", "Jail may access kmem-like devices (io, dri) if they exist"); 4412 4413 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4414 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4415 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4416 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 4417 "B", "Jail may mount the devfs file system"); 4418 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 4419 "B", "Jail may mount the nullfs file system"); 4420 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 4421 "B", "Jail may mount the procfs file system"); 4422 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW, 4423 "B", "Jail may mount the tmpfs file system"); 4424 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 4425 "B", "Jail may mount the zfs file system"); 4426 4427 void 4428 prison_racct_foreach(void (*callback)(struct racct *racct, 4429 void *arg2, void *arg3), void *arg2, void *arg3) 4430 { 4431 struct prison_racct *prr; 4432 4433 sx_slock(&allprison_lock); 4434 LIST_FOREACH(prr, &allprison_racct, prr_next) 4435 (callback)(prr->prr_racct, arg2, arg3); 4436 sx_sunlock(&allprison_lock); 4437 } 4438 4439 static struct prison_racct * 4440 prison_racct_find_locked(const char *name) 4441 { 4442 struct prison_racct *prr; 4443 4444 sx_assert(&allprison_lock, SA_XLOCKED); 4445 4446 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4447 return (NULL); 4448 4449 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4450 if (strcmp(name, prr->prr_name) != 0) 4451 continue; 4452 4453 /* Found prison_racct with a matching name? */ 4454 prison_racct_hold(prr); 4455 return (prr); 4456 } 4457 4458 /* Add new prison_racct. */ 4459 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4460 racct_create(&prr->prr_racct); 4461 4462 strcpy(prr->prr_name, name); 4463 refcount_init(&prr->prr_refcount, 1); 4464 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4465 4466 return (prr); 4467 } 4468 4469 struct prison_racct * 4470 prison_racct_find(const char *name) 4471 { 4472 struct prison_racct *prr; 4473 4474 sx_xlock(&allprison_lock); 4475 prr = prison_racct_find_locked(name); 4476 sx_xunlock(&allprison_lock); 4477 return (prr); 4478 } 4479 4480 void 4481 prison_racct_hold(struct prison_racct *prr) 4482 { 4483 4484 refcount_acquire(&prr->prr_refcount); 4485 } 4486 4487 static void 4488 prison_racct_free_locked(struct prison_racct *prr) 4489 { 4490 4491 sx_assert(&allprison_lock, SA_XLOCKED); 4492 4493 if (refcount_release(&prr->prr_refcount)) { 4494 racct_destroy(&prr->prr_racct); 4495 LIST_REMOVE(prr, prr_next); 4496 free(prr, M_PRISON_RACCT); 4497 } 4498 } 4499 4500 void 4501 prison_racct_free(struct prison_racct *prr) 4502 { 4503 int old; 4504 4505 sx_assert(&allprison_lock, SA_UNLOCKED); 4506 4507 old = prr->prr_refcount; 4508 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4509 return; 4510 4511 sx_xlock(&allprison_lock); 4512 prison_racct_free_locked(prr); 4513 sx_xunlock(&allprison_lock); 4514 } 4515 4516 #ifdef RACCT 4517 static void 4518 prison_racct_attach(struct prison *pr) 4519 { 4520 struct prison_racct *prr; 4521 4522 sx_assert(&allprison_lock, SA_XLOCKED); 4523 4524 prr = prison_racct_find_locked(pr->pr_name); 4525 KASSERT(prr != NULL, ("cannot find prison_racct")); 4526 4527 pr->pr_prison_racct = prr; 4528 } 4529 4530 /* 4531 * Handle jail renaming. From the racct point of view, renaming means 4532 * moving from one prison_racct to another. 4533 */ 4534 static void 4535 prison_racct_modify(struct prison *pr) 4536 { 4537 struct proc *p; 4538 struct ucred *cred; 4539 struct prison_racct *oldprr; 4540 4541 sx_slock(&allproc_lock); 4542 sx_xlock(&allprison_lock); 4543 4544 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4545 sx_xunlock(&allprison_lock); 4546 sx_sunlock(&allproc_lock); 4547 return; 4548 } 4549 4550 oldprr = pr->pr_prison_racct; 4551 pr->pr_prison_racct = NULL; 4552 4553 prison_racct_attach(pr); 4554 4555 /* 4556 * Move resource utilisation records. 4557 */ 4558 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4559 4560 /* 4561 * Force rctl to reattach rules to processes. 4562 */ 4563 FOREACH_PROC_IN_SYSTEM(p) { 4564 PROC_LOCK(p); 4565 cred = crhold(p->p_ucred); 4566 PROC_UNLOCK(p); 4567 racct_proc_ucred_changed(p, cred, cred); 4568 crfree(cred); 4569 } 4570 4571 sx_sunlock(&allproc_lock); 4572 prison_racct_free_locked(oldprr); 4573 sx_xunlock(&allprison_lock); 4574 } 4575 4576 static void 4577 prison_racct_detach(struct prison *pr) 4578 { 4579 4580 sx_assert(&allprison_lock, SA_UNLOCKED); 4581 4582 if (pr->pr_prison_racct == NULL) 4583 return; 4584 prison_racct_free(pr->pr_prison_racct); 4585 pr->pr_prison_racct = NULL; 4586 } 4587 #endif /* RACCT */ 4588 4589 #ifdef DDB 4590 4591 static void 4592 db_show_prison(struct prison *pr) 4593 { 4594 int fi; 4595 #if defined(INET) || defined(INET6) 4596 int ii; 4597 #endif 4598 unsigned jsf; 4599 #ifdef INET6 4600 char ip6buf[INET6_ADDRSTRLEN]; 4601 #endif 4602 4603 db_printf("prison %p:\n", pr); 4604 db_printf(" jid = %d\n", pr->pr_id); 4605 db_printf(" name = %s\n", pr->pr_name); 4606 db_printf(" parent = %p\n", pr->pr_parent); 4607 db_printf(" ref = %d\n", pr->pr_ref); 4608 db_printf(" uref = %d\n", pr->pr_uref); 4609 db_printf(" path = %s\n", pr->pr_path); 4610 db_printf(" cpuset = %d\n", pr->pr_cpuset 4611 ? pr->pr_cpuset->cs_id : -1); 4612 #ifdef VIMAGE 4613 db_printf(" vnet = %p\n", pr->pr_vnet); 4614 #endif 4615 db_printf(" root = %p\n", pr->pr_root); 4616 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4617 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4618 db_printf(" children.max = %d\n", pr->pr_childmax); 4619 db_printf(" children.cur = %d\n", pr->pr_childcount); 4620 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4621 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4622 db_printf(" flags = 0x%x", pr->pr_flags); 4623 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4624 fi++) 4625 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4626 db_printf(" %s", pr_flag_names[fi]); 4627 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4628 fi++) { 4629 jsf = pr->pr_flags & 4630 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4631 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4632 pr_flag_jailsys[fi].disable && 4633 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4634 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4635 : "inherit"); 4636 } 4637 db_printf(" allow = 0x%x", pr->pr_allow); 4638 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4639 fi++) 4640 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4641 db_printf(" %s", pr_allow_names[fi]); 4642 db_printf("\n"); 4643 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4644 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4645 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4646 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4647 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4648 #ifdef INET 4649 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4650 for (ii = 0; ii < pr->pr_ip4s; ii++) 4651 db_printf(" %s %s\n", 4652 ii == 0 ? "ip4.addr =" : " ", 4653 inet_ntoa(pr->pr_ip4[ii])); 4654 #endif 4655 #ifdef INET6 4656 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4657 for (ii = 0; ii < pr->pr_ip6s; ii++) 4658 db_printf(" %s %s\n", 4659 ii == 0 ? "ip6.addr =" : " ", 4660 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4661 #endif 4662 } 4663 4664 DB_SHOW_COMMAND(prison, db_show_prison_command) 4665 { 4666 struct prison *pr; 4667 4668 if (!have_addr) { 4669 /* 4670 * Show all prisons in the list, and prison0 which is not 4671 * listed. 4672 */ 4673 db_show_prison(&prison0); 4674 if (!db_pager_quit) { 4675 TAILQ_FOREACH(pr, &allprison, pr_list) { 4676 db_show_prison(pr); 4677 if (db_pager_quit) 4678 break; 4679 } 4680 } 4681 return; 4682 } 4683 4684 if (addr == 0) 4685 pr = &prison0; 4686 else { 4687 /* Look for a prison with the ID and with references. */ 4688 TAILQ_FOREACH(pr, &allprison, pr_list) 4689 if (pr->pr_id == addr && pr->pr_ref > 0) 4690 break; 4691 if (pr == NULL) 4692 /* Look again, without requiring a reference. */ 4693 TAILQ_FOREACH(pr, &allprison, pr_list) 4694 if (pr->pr_id == addr) 4695 break; 4696 if (pr == NULL) 4697 /* Assume address points to a valid prison. */ 4698 pr = (struct prison *)addr; 4699 } 4700 db_show_prison(pr); 4701 } 4702 4703 #endif /* DDB */ 4704