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