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 if (!(flags & JAIL_ATTACH)) 1816 sx_sunlock(&allprison_lock); 1817 prison_racct_modify(pr); 1818 if (!(flags & JAIL_ATTACH)) 1819 sx_slock(&allprison_lock); 1820 } 1821 #endif 1822 1823 td->td_retval[0] = pr->pr_id; 1824 1825 /* 1826 * Now that it is all there, drop the temporary reference from existing 1827 * prisons. Or add a reference to newly created persistent prisons 1828 * (which was not done earlier so that the prison would not be publicly 1829 * visible). 1830 */ 1831 if (!created) { 1832 prison_deref(pr, (flags & JAIL_ATTACH) 1833 ? PD_DEREF 1834 : PD_DEREF | PD_LIST_SLOCKED); 1835 } else { 1836 if (pr_flags & PR_PERSIST) { 1837 mtx_lock(&pr->pr_mtx); 1838 pr->pr_ref++; 1839 pr->pr_uref++; 1840 mtx_unlock(&pr->pr_mtx); 1841 } 1842 if (!(flags & JAIL_ATTACH)) 1843 sx_sunlock(&allprison_lock); 1844 } 1845 1846 goto done_errmsg; 1847 1848 done_deref_locked: 1849 prison_deref(pr, created 1850 ? PD_LOCKED | PD_LIST_XLOCKED 1851 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1852 goto done_releroot; 1853 done_unlock_list: 1854 sx_xunlock(&allprison_lock); 1855 done_releroot: 1856 if (root != NULL) 1857 vrele(root); 1858 done_errmsg: 1859 if (error) { 1860 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1861 if (errmsg_len > 0) { 1862 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1863 if (errmsg_pos > 0) { 1864 if (optuio->uio_segflg == UIO_SYSSPACE) 1865 bcopy(errmsg, 1866 optuio->uio_iov[errmsg_pos].iov_base, 1867 errmsg_len); 1868 else 1869 copyout(errmsg, 1870 optuio->uio_iov[errmsg_pos].iov_base, 1871 errmsg_len); 1872 } 1873 } 1874 } 1875 done_free: 1876 #ifdef INET 1877 free(ip4, M_PRISON); 1878 #endif 1879 #ifdef INET6 1880 free(ip6, M_PRISON); 1881 #endif 1882 if (g_path != NULL) 1883 free(g_path, M_TEMP); 1884 vfs_freeopts(opts); 1885 return (error); 1886 } 1887 1888 1889 /* 1890 * struct jail_get_args { 1891 * struct iovec *iovp; 1892 * unsigned int iovcnt; 1893 * int flags; 1894 * }; 1895 */ 1896 int 1897 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1898 { 1899 struct uio *auio; 1900 int error; 1901 1902 /* Check that we have an even number of iovecs. */ 1903 if (uap->iovcnt & 1) 1904 return (EINVAL); 1905 1906 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1907 if (error) 1908 return (error); 1909 error = kern_jail_get(td, auio, uap->flags); 1910 if (error == 0) 1911 error = copyout(auio->uio_iov, uap->iovp, 1912 uap->iovcnt * sizeof (struct iovec)); 1913 free(auio, M_IOV); 1914 return (error); 1915 } 1916 1917 int 1918 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1919 { 1920 struct prison *pr, *mypr; 1921 struct vfsopt *opt; 1922 struct vfsoptlist *opts; 1923 char *errmsg, *name; 1924 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1925 1926 if (flags & ~JAIL_GET_MASK) 1927 return (EINVAL); 1928 1929 /* Get the parameter list. */ 1930 error = vfs_buildopts(optuio, &opts); 1931 if (error) 1932 return (error); 1933 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1934 mypr = td->td_ucred->cr_prison; 1935 1936 /* 1937 * Find the prison specified by one of: lastjid, jid, name. 1938 */ 1939 sx_slock(&allprison_lock); 1940 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1941 if (error == 0) { 1942 TAILQ_FOREACH(pr, &allprison, pr_list) { 1943 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1944 mtx_lock(&pr->pr_mtx); 1945 if (pr->pr_ref > 0 && 1946 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1947 break; 1948 mtx_unlock(&pr->pr_mtx); 1949 } 1950 } 1951 if (pr != NULL) 1952 goto found_prison; 1953 error = ENOENT; 1954 vfs_opterror(opts, "no jail after %d", jid); 1955 goto done_unlock_list; 1956 } else if (error != ENOENT) 1957 goto done_unlock_list; 1958 1959 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1960 if (error == 0) { 1961 if (jid != 0) { 1962 pr = prison_find_child(mypr, jid); 1963 if (pr != NULL) { 1964 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1965 mtx_unlock(&pr->pr_mtx); 1966 error = ENOENT; 1967 vfs_opterror(opts, "jail %d is dying", 1968 jid); 1969 goto done_unlock_list; 1970 } 1971 goto found_prison; 1972 } 1973 error = ENOENT; 1974 vfs_opterror(opts, "jail %d not found", jid); 1975 goto done_unlock_list; 1976 } 1977 } else if (error != ENOENT) 1978 goto done_unlock_list; 1979 1980 error = vfs_getopt(opts, "name", (void **)&name, &len); 1981 if (error == 0) { 1982 if (len == 0 || name[len - 1] != '\0') { 1983 error = EINVAL; 1984 goto done_unlock_list; 1985 } 1986 pr = prison_find_name(mypr, name); 1987 if (pr != NULL) { 1988 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1989 mtx_unlock(&pr->pr_mtx); 1990 error = ENOENT; 1991 vfs_opterror(opts, "jail \"%s\" is dying", 1992 name); 1993 goto done_unlock_list; 1994 } 1995 goto found_prison; 1996 } 1997 error = ENOENT; 1998 vfs_opterror(opts, "jail \"%s\" not found", name); 1999 goto done_unlock_list; 2000 } else if (error != ENOENT) 2001 goto done_unlock_list; 2002 2003 vfs_opterror(opts, "no jail specified"); 2004 error = ENOENT; 2005 goto done_unlock_list; 2006 2007 found_prison: 2008 /* Get the parameters of the prison. */ 2009 pr->pr_ref++; 2010 locked = PD_LOCKED; 2011 td->td_retval[0] = pr->pr_id; 2012 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2013 if (error != 0 && error != ENOENT) 2014 goto done_deref; 2015 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2016 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2017 if (error != 0 && error != ENOENT) 2018 goto done_deref; 2019 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2020 if (error != 0 && error != ENOENT) 2021 goto done_deref; 2022 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2023 sizeof(pr->pr_cpuset->cs_id)); 2024 if (error != 0 && error != ENOENT) 2025 goto done_deref; 2026 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2027 if (error != 0 && error != ENOENT) 2028 goto done_deref; 2029 #ifdef INET 2030 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2031 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2032 if (error != 0 && error != ENOENT) 2033 goto done_deref; 2034 #endif 2035 #ifdef INET6 2036 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2037 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2038 if (error != 0 && error != ENOENT) 2039 goto done_deref; 2040 #endif 2041 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2042 sizeof(pr->pr_securelevel)); 2043 if (error != 0 && error != ENOENT) 2044 goto done_deref; 2045 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2046 sizeof(pr->pr_childcount)); 2047 if (error != 0 && error != ENOENT) 2048 goto done_deref; 2049 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2050 sizeof(pr->pr_childmax)); 2051 if (error != 0 && error != ENOENT) 2052 goto done_deref; 2053 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2054 if (error != 0 && error != ENOENT) 2055 goto done_deref; 2056 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2057 if (error != 0 && error != ENOENT) 2058 goto done_deref; 2059 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2060 if (error != 0 && error != ENOENT) 2061 goto done_deref; 2062 #ifdef COMPAT_FREEBSD32 2063 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2064 uint32_t hid32 = pr->pr_hostid; 2065 2066 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2067 } else 2068 #endif 2069 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2070 sizeof(pr->pr_hostid)); 2071 if (error != 0 && error != ENOENT) 2072 goto done_deref; 2073 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2074 sizeof(pr->pr_enforce_statfs)); 2075 if (error != 0 && error != ENOENT) 2076 goto done_deref; 2077 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2078 sizeof(pr->pr_devfs_rsnum)); 2079 if (error != 0 && error != ENOENT) 2080 goto done_deref; 2081 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 2082 fi++) { 2083 if (pr_flag_names[fi] == NULL) 2084 continue; 2085 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2086 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2087 if (error != 0 && error != ENOENT) 2088 goto done_deref; 2089 i = !i; 2090 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2091 if (error != 0 && error != ENOENT) 2092 goto done_deref; 2093 } 2094 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 2095 fi++) { 2096 i = pr->pr_flags & 2097 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2098 i = pr_flag_jailsys[fi].disable && 2099 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2100 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2101 : JAIL_SYS_INHERIT; 2102 error = 2103 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2104 if (error != 0 && error != ENOENT) 2105 goto done_deref; 2106 } 2107 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 2108 fi++) { 2109 if (pr_allow_names[fi] == NULL) 2110 continue; 2111 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2112 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2113 if (error != 0 && error != ENOENT) 2114 goto done_deref; 2115 i = !i; 2116 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2117 if (error != 0 && error != ENOENT) 2118 goto done_deref; 2119 } 2120 i = (pr->pr_uref == 0); 2121 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2122 if (error != 0 && error != ENOENT) 2123 goto done_deref; 2124 i = !i; 2125 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2126 if (error != 0 && error != ENOENT) 2127 goto done_deref; 2128 2129 /* Get the module parameters. */ 2130 mtx_unlock(&pr->pr_mtx); 2131 locked = 0; 2132 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2133 if (error) 2134 goto done_deref; 2135 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2136 2137 /* By now, all parameters should have been noted. */ 2138 TAILQ_FOREACH(opt, opts, link) { 2139 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2140 error = EINVAL; 2141 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2142 goto done_errmsg; 2143 } 2144 } 2145 2146 /* Write the fetched parameters back to userspace. */ 2147 error = 0; 2148 TAILQ_FOREACH(opt, opts, link) { 2149 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2150 pos = 2 * opt->pos + 1; 2151 optuio->uio_iov[pos].iov_len = opt->len; 2152 if (opt->value != NULL) { 2153 if (optuio->uio_segflg == UIO_SYSSPACE) { 2154 bcopy(opt->value, 2155 optuio->uio_iov[pos].iov_base, 2156 opt->len); 2157 } else { 2158 error = copyout(opt->value, 2159 optuio->uio_iov[pos].iov_base, 2160 opt->len); 2161 if (error) 2162 break; 2163 } 2164 } 2165 } 2166 } 2167 goto done_errmsg; 2168 2169 done_deref: 2170 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2171 goto done_errmsg; 2172 2173 done_unlock_list: 2174 sx_sunlock(&allprison_lock); 2175 done_errmsg: 2176 if (error && errmsg_pos >= 0) { 2177 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2178 errmsg_pos = 2 * errmsg_pos + 1; 2179 if (errmsg_len > 0) { 2180 if (optuio->uio_segflg == UIO_SYSSPACE) 2181 bcopy(errmsg, 2182 optuio->uio_iov[errmsg_pos].iov_base, 2183 errmsg_len); 2184 else 2185 copyout(errmsg, 2186 optuio->uio_iov[errmsg_pos].iov_base, 2187 errmsg_len); 2188 } 2189 } 2190 vfs_freeopts(opts); 2191 return (error); 2192 } 2193 2194 2195 /* 2196 * struct jail_remove_args { 2197 * int jid; 2198 * }; 2199 */ 2200 int 2201 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2202 { 2203 struct prison *pr, *cpr, *lpr, *tpr; 2204 int descend, error; 2205 2206 error = priv_check(td, PRIV_JAIL_REMOVE); 2207 if (error) 2208 return (error); 2209 2210 sx_xlock(&allprison_lock); 2211 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2212 if (pr == NULL) { 2213 sx_xunlock(&allprison_lock); 2214 return (EINVAL); 2215 } 2216 2217 /* Remove all descendants of this prison, then remove this prison. */ 2218 pr->pr_ref++; 2219 pr->pr_flags |= PR_REMOVE; 2220 if (!LIST_EMPTY(&pr->pr_children)) { 2221 mtx_unlock(&pr->pr_mtx); 2222 lpr = NULL; 2223 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2224 mtx_lock(&cpr->pr_mtx); 2225 if (cpr->pr_ref > 0) { 2226 tpr = cpr; 2227 cpr->pr_ref++; 2228 cpr->pr_flags |= PR_REMOVE; 2229 } else { 2230 /* Already removed - do not do it again. */ 2231 tpr = NULL; 2232 } 2233 mtx_unlock(&cpr->pr_mtx); 2234 if (lpr != NULL) { 2235 mtx_lock(&lpr->pr_mtx); 2236 prison_remove_one(lpr); 2237 sx_xlock(&allprison_lock); 2238 } 2239 lpr = tpr; 2240 } 2241 if (lpr != NULL) { 2242 mtx_lock(&lpr->pr_mtx); 2243 prison_remove_one(lpr); 2244 sx_xlock(&allprison_lock); 2245 } 2246 mtx_lock(&pr->pr_mtx); 2247 } 2248 prison_remove_one(pr); 2249 return (0); 2250 } 2251 2252 static void 2253 prison_remove_one(struct prison *pr) 2254 { 2255 struct proc *p; 2256 int deuref; 2257 2258 /* If the prison was persistent, it is not anymore. */ 2259 deuref = 0; 2260 if (pr->pr_flags & PR_PERSIST) { 2261 pr->pr_ref--; 2262 deuref = PD_DEUREF; 2263 pr->pr_flags &= ~PR_PERSIST; 2264 } 2265 2266 /* 2267 * jail_remove added a reference. If that's the only one, remove 2268 * the prison now. 2269 */ 2270 KASSERT(pr->pr_ref > 0, 2271 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2272 if (pr->pr_ref == 1) { 2273 prison_deref(pr, 2274 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2275 return; 2276 } 2277 2278 mtx_unlock(&pr->pr_mtx); 2279 sx_xunlock(&allprison_lock); 2280 /* 2281 * Kill all processes unfortunate enough to be attached to this prison. 2282 */ 2283 sx_slock(&allproc_lock); 2284 LIST_FOREACH(p, &allproc, p_list) { 2285 PROC_LOCK(p); 2286 if (p->p_state != PRS_NEW && p->p_ucred && 2287 p->p_ucred->cr_prison == pr) 2288 kern_psignal(p, SIGKILL); 2289 PROC_UNLOCK(p); 2290 } 2291 sx_sunlock(&allproc_lock); 2292 /* Remove the temporary reference added by jail_remove. */ 2293 prison_deref(pr, deuref | PD_DEREF); 2294 } 2295 2296 2297 /* 2298 * struct jail_attach_args { 2299 * int jid; 2300 * }; 2301 */ 2302 int 2303 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2304 { 2305 struct prison *pr; 2306 int error; 2307 2308 error = priv_check(td, PRIV_JAIL_ATTACH); 2309 if (error) 2310 return (error); 2311 2312 sx_slock(&allprison_lock); 2313 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2314 if (pr == NULL) { 2315 sx_sunlock(&allprison_lock); 2316 return (EINVAL); 2317 } 2318 2319 /* 2320 * Do not allow a process to attach to a prison that is not 2321 * considered to be "alive". 2322 */ 2323 if (pr->pr_uref == 0) { 2324 mtx_unlock(&pr->pr_mtx); 2325 sx_sunlock(&allprison_lock); 2326 return (EINVAL); 2327 } 2328 2329 return (do_jail_attach(td, pr)); 2330 } 2331 2332 static int 2333 do_jail_attach(struct thread *td, struct prison *pr) 2334 { 2335 struct prison *ppr; 2336 struct proc *p; 2337 struct ucred *newcred, *oldcred; 2338 int error; 2339 2340 /* 2341 * XXX: Note that there is a slight race here if two threads 2342 * in the same privileged process attempt to attach to two 2343 * different jails at the same time. It is important for 2344 * user processes not to do this, or they might end up with 2345 * a process root from one prison, but attached to the jail 2346 * of another. 2347 */ 2348 pr->pr_ref++; 2349 pr->pr_uref++; 2350 mtx_unlock(&pr->pr_mtx); 2351 2352 /* Let modules do whatever they need to prepare for attaching. */ 2353 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2354 if (error) { 2355 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2356 return (error); 2357 } 2358 sx_sunlock(&allprison_lock); 2359 2360 /* 2361 * Reparent the newly attached process to this jail. 2362 */ 2363 ppr = td->td_ucred->cr_prison; 2364 p = td->td_proc; 2365 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2366 if (error) 2367 goto e_revert_osd; 2368 2369 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2370 if ((error = change_dir(pr->pr_root, td)) != 0) 2371 goto e_unlock; 2372 #ifdef MAC 2373 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2374 goto e_unlock; 2375 #endif 2376 VOP_UNLOCK(pr->pr_root, 0); 2377 if ((error = change_root(pr->pr_root, td))) 2378 goto e_revert_osd; 2379 2380 newcred = crget(); 2381 PROC_LOCK(p); 2382 oldcred = p->p_ucred; 2383 setsugid(p); 2384 crcopy(newcred, oldcred); 2385 newcred->cr_prison = pr; 2386 p->p_ucred = newcred; 2387 PROC_UNLOCK(p); 2388 #ifdef RACCT 2389 racct_proc_ucred_changed(p, oldcred, newcred); 2390 #endif 2391 crfree(oldcred); 2392 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2393 return (0); 2394 e_unlock: 2395 VOP_UNLOCK(pr->pr_root, 0); 2396 e_revert_osd: 2397 /* Tell modules this thread is still in its old jail after all. */ 2398 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2399 prison_deref(pr, PD_DEREF | PD_DEUREF); 2400 return (error); 2401 } 2402 2403 2404 /* 2405 * Returns a locked prison instance, or NULL on failure. 2406 */ 2407 struct prison * 2408 prison_find(int prid) 2409 { 2410 struct prison *pr; 2411 2412 sx_assert(&allprison_lock, SX_LOCKED); 2413 TAILQ_FOREACH(pr, &allprison, pr_list) { 2414 if (pr->pr_id == prid) { 2415 mtx_lock(&pr->pr_mtx); 2416 if (pr->pr_ref > 0) 2417 return (pr); 2418 mtx_unlock(&pr->pr_mtx); 2419 } 2420 } 2421 return (NULL); 2422 } 2423 2424 /* 2425 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2426 */ 2427 struct prison * 2428 prison_find_child(struct prison *mypr, int prid) 2429 { 2430 struct prison *pr; 2431 int descend; 2432 2433 sx_assert(&allprison_lock, SX_LOCKED); 2434 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2435 if (pr->pr_id == prid) { 2436 mtx_lock(&pr->pr_mtx); 2437 if (pr->pr_ref > 0) 2438 return (pr); 2439 mtx_unlock(&pr->pr_mtx); 2440 } 2441 } 2442 return (NULL); 2443 } 2444 2445 /* 2446 * Look for the name relative to mypr. Returns a locked prison or NULL. 2447 */ 2448 struct prison * 2449 prison_find_name(struct prison *mypr, const char *name) 2450 { 2451 struct prison *pr, *deadpr; 2452 size_t mylen; 2453 int descend; 2454 2455 sx_assert(&allprison_lock, SX_LOCKED); 2456 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2457 again: 2458 deadpr = NULL; 2459 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2460 if (!strcmp(pr->pr_name + mylen, name)) { 2461 mtx_lock(&pr->pr_mtx); 2462 if (pr->pr_ref > 0) { 2463 if (pr->pr_uref > 0) 2464 return (pr); 2465 deadpr = pr; 2466 } 2467 mtx_unlock(&pr->pr_mtx); 2468 } 2469 } 2470 /* There was no valid prison - perhaps there was a dying one. */ 2471 if (deadpr != NULL) { 2472 mtx_lock(&deadpr->pr_mtx); 2473 if (deadpr->pr_ref == 0) { 2474 mtx_unlock(&deadpr->pr_mtx); 2475 goto again; 2476 } 2477 } 2478 return (deadpr); 2479 } 2480 2481 /* 2482 * See if a prison has the specific flag set. 2483 */ 2484 int 2485 prison_flag(struct ucred *cred, unsigned flag) 2486 { 2487 2488 /* This is an atomic read, so no locking is necessary. */ 2489 return (cred->cr_prison->pr_flags & flag); 2490 } 2491 2492 int 2493 prison_allow(struct ucred *cred, unsigned flag) 2494 { 2495 2496 /* This is an atomic read, so no locking is necessary. */ 2497 return (cred->cr_prison->pr_allow & flag); 2498 } 2499 2500 /* 2501 * Remove a prison reference. If that was the last reference, remove the 2502 * prison itself - but not in this context in case there are locks held. 2503 */ 2504 void 2505 prison_free_locked(struct prison *pr) 2506 { 2507 2508 mtx_assert(&pr->pr_mtx, MA_OWNED); 2509 pr->pr_ref--; 2510 if (pr->pr_ref == 0) { 2511 mtx_unlock(&pr->pr_mtx); 2512 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2513 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2514 return; 2515 } 2516 mtx_unlock(&pr->pr_mtx); 2517 } 2518 2519 void 2520 prison_free(struct prison *pr) 2521 { 2522 2523 mtx_lock(&pr->pr_mtx); 2524 prison_free_locked(pr); 2525 } 2526 2527 static void 2528 prison_complete(void *context, int pending) 2529 { 2530 2531 prison_deref((struct prison *)context, 0); 2532 } 2533 2534 /* 2535 * Remove a prison reference (usually). This internal version assumes no 2536 * mutexes are held, except perhaps the prison itself. If there are no more 2537 * references, release and delist the prison. On completion, the prison lock 2538 * and the allprison lock are both unlocked. 2539 */ 2540 static void 2541 prison_deref(struct prison *pr, int flags) 2542 { 2543 struct prison *ppr, *tpr; 2544 2545 if (!(flags & PD_LOCKED)) 2546 mtx_lock(&pr->pr_mtx); 2547 for (;;) { 2548 if (flags & PD_DEUREF) { 2549 pr->pr_uref--; 2550 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2551 } 2552 if (flags & PD_DEREF) 2553 pr->pr_ref--; 2554 /* If the prison still has references, nothing else to do. */ 2555 if (pr->pr_ref > 0) { 2556 mtx_unlock(&pr->pr_mtx); 2557 if (flags & PD_LIST_SLOCKED) 2558 sx_sunlock(&allprison_lock); 2559 else if (flags & PD_LIST_XLOCKED) 2560 sx_xunlock(&allprison_lock); 2561 return; 2562 } 2563 2564 mtx_unlock(&pr->pr_mtx); 2565 if (flags & PD_LIST_SLOCKED) { 2566 if (!sx_try_upgrade(&allprison_lock)) { 2567 sx_sunlock(&allprison_lock); 2568 sx_xlock(&allprison_lock); 2569 } 2570 } else if (!(flags & PD_LIST_XLOCKED)) 2571 sx_xlock(&allprison_lock); 2572 2573 TAILQ_REMOVE(&allprison, pr, pr_list); 2574 LIST_REMOVE(pr, pr_sibling); 2575 ppr = pr->pr_parent; 2576 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2577 tpr->pr_childcount--; 2578 sx_xunlock(&allprison_lock); 2579 2580 #ifdef VIMAGE 2581 if (pr->pr_vnet != ppr->pr_vnet) 2582 vnet_destroy(pr->pr_vnet); 2583 #endif 2584 if (pr->pr_root != NULL) 2585 vrele(pr->pr_root); 2586 mtx_destroy(&pr->pr_mtx); 2587 #ifdef INET 2588 free(pr->pr_ip4, M_PRISON); 2589 #endif 2590 #ifdef INET6 2591 free(pr->pr_ip6, M_PRISON); 2592 #endif 2593 if (pr->pr_cpuset != NULL) 2594 cpuset_rel(pr->pr_cpuset); 2595 osd_jail_exit(pr); 2596 #ifdef RACCT 2597 prison_racct_detach(pr); 2598 #endif 2599 free(pr, M_PRISON); 2600 2601 /* Removing a prison frees a reference on its parent. */ 2602 pr = ppr; 2603 mtx_lock(&pr->pr_mtx); 2604 flags = PD_DEREF | PD_DEUREF; 2605 } 2606 } 2607 2608 void 2609 prison_hold_locked(struct prison *pr) 2610 { 2611 2612 mtx_assert(&pr->pr_mtx, MA_OWNED); 2613 KASSERT(pr->pr_ref > 0, 2614 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2615 pr->pr_ref++; 2616 } 2617 2618 void 2619 prison_hold(struct prison *pr) 2620 { 2621 2622 mtx_lock(&pr->pr_mtx); 2623 prison_hold_locked(pr); 2624 mtx_unlock(&pr->pr_mtx); 2625 } 2626 2627 void 2628 prison_proc_hold(struct prison *pr) 2629 { 2630 2631 mtx_lock(&pr->pr_mtx); 2632 KASSERT(pr->pr_uref > 0, 2633 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2634 pr->pr_uref++; 2635 mtx_unlock(&pr->pr_mtx); 2636 } 2637 2638 void 2639 prison_proc_free(struct prison *pr) 2640 { 2641 2642 mtx_lock(&pr->pr_mtx); 2643 KASSERT(pr->pr_uref > 0, 2644 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2645 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2646 } 2647 2648 2649 #ifdef INET 2650 /* 2651 * Restrict a prison's IP address list with its parent's, possibly replacing 2652 * it. Return true if the replacement buffer was used (or would have been). 2653 */ 2654 static int 2655 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2656 { 2657 int ii, ij, used; 2658 struct prison *ppr; 2659 2660 ppr = pr->pr_parent; 2661 if (!(pr->pr_flags & PR_IP4_USER)) { 2662 /* This has no user settings, so just copy the parent's list. */ 2663 if (pr->pr_ip4s < ppr->pr_ip4s) { 2664 /* 2665 * There's no room for the parent's list. Use the 2666 * new list buffer, which is assumed to be big enough 2667 * (if it was passed). If there's no buffer, try to 2668 * allocate one. 2669 */ 2670 used = 1; 2671 if (newip4 == NULL) { 2672 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2673 M_PRISON, M_NOWAIT); 2674 if (newip4 != NULL) 2675 used = 0; 2676 } 2677 if (newip4 != NULL) { 2678 bcopy(ppr->pr_ip4, newip4, 2679 ppr->pr_ip4s * sizeof(*newip4)); 2680 free(pr->pr_ip4, M_PRISON); 2681 pr->pr_ip4 = newip4; 2682 pr->pr_ip4s = ppr->pr_ip4s; 2683 } 2684 return (used); 2685 } 2686 pr->pr_ip4s = ppr->pr_ip4s; 2687 if (pr->pr_ip4s > 0) 2688 bcopy(ppr->pr_ip4, pr->pr_ip4, 2689 pr->pr_ip4s * sizeof(*newip4)); 2690 else if (pr->pr_ip4 != NULL) { 2691 free(pr->pr_ip4, M_PRISON); 2692 pr->pr_ip4 = NULL; 2693 } 2694 } else if (pr->pr_ip4s > 0) { 2695 /* Remove addresses that aren't in the parent. */ 2696 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2697 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2698 break; 2699 if (ij < ppr->pr_ip4s) 2700 ii = 1; 2701 else { 2702 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2703 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2704 ii = 0; 2705 } 2706 for (ij = 1; ii < pr->pr_ip4s; ) { 2707 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2708 ii++; 2709 continue; 2710 } 2711 switch (ij >= ppr->pr_ip4s ? -1 : 2712 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2713 case -1: 2714 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2715 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2716 break; 2717 case 0: 2718 ii++; 2719 ij++; 2720 break; 2721 case 1: 2722 ij++; 2723 break; 2724 } 2725 } 2726 if (pr->pr_ip4s == 0) { 2727 pr->pr_flags |= PR_IP4_DISABLE; 2728 free(pr->pr_ip4, M_PRISON); 2729 pr->pr_ip4 = NULL; 2730 } 2731 } 2732 return (0); 2733 } 2734 2735 /* 2736 * Pass back primary IPv4 address of this jail. 2737 * 2738 * If not restricted return success but do not alter the address. Caller has 2739 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2740 * 2741 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2742 * Address returned in NBO. 2743 */ 2744 int 2745 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2746 { 2747 struct prison *pr; 2748 2749 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2750 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2751 2752 pr = cred->cr_prison; 2753 if (!(pr->pr_flags & PR_IP4)) 2754 return (0); 2755 mtx_lock(&pr->pr_mtx); 2756 if (!(pr->pr_flags & PR_IP4)) { 2757 mtx_unlock(&pr->pr_mtx); 2758 return (0); 2759 } 2760 if (pr->pr_ip4 == NULL) { 2761 mtx_unlock(&pr->pr_mtx); 2762 return (EAFNOSUPPORT); 2763 } 2764 2765 ia->s_addr = pr->pr_ip4[0].s_addr; 2766 mtx_unlock(&pr->pr_mtx); 2767 return (0); 2768 } 2769 2770 /* 2771 * Return 1 if we should do proper source address selection or are not jailed. 2772 * We will return 0 if we should bypass source address selection in favour 2773 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2774 * returned in NBO. 2775 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2776 */ 2777 int 2778 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2779 { 2780 struct prison *pr; 2781 struct in_addr lia; 2782 int error; 2783 2784 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2785 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2786 2787 if (!jailed(cred)) 2788 return (1); 2789 2790 pr = cred->cr_prison; 2791 if (pr->pr_flags & PR_IP4_SADDRSEL) 2792 return (1); 2793 2794 lia.s_addr = INADDR_ANY; 2795 error = prison_get_ip4(cred, &lia); 2796 if (error) 2797 return (error); 2798 if (lia.s_addr == INADDR_ANY) 2799 return (1); 2800 2801 ia->s_addr = lia.s_addr; 2802 return (0); 2803 } 2804 2805 /* 2806 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2807 */ 2808 int 2809 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2810 { 2811 2812 if (pr1 == pr2) 2813 return (1); 2814 2815 /* 2816 * No need to lock since the PR_IP4_USER flag can't be altered for 2817 * existing prisons. 2818 */ 2819 while (pr1 != &prison0 && 2820 #ifdef VIMAGE 2821 !(pr1->pr_flags & PR_VNET) && 2822 #endif 2823 !(pr1->pr_flags & PR_IP4_USER)) 2824 pr1 = pr1->pr_parent; 2825 while (pr2 != &prison0 && 2826 #ifdef VIMAGE 2827 !(pr2->pr_flags & PR_VNET) && 2828 #endif 2829 !(pr2->pr_flags & PR_IP4_USER)) 2830 pr2 = pr2->pr_parent; 2831 return (pr1 == pr2); 2832 } 2833 2834 /* 2835 * Make sure our (source) address is set to something meaningful to this 2836 * jail. 2837 * 2838 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2839 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2840 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2841 */ 2842 int 2843 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2844 { 2845 struct prison *pr; 2846 struct in_addr ia0; 2847 int error; 2848 2849 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2850 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2851 2852 pr = cred->cr_prison; 2853 if (!(pr->pr_flags & PR_IP4)) 2854 return (0); 2855 mtx_lock(&pr->pr_mtx); 2856 if (!(pr->pr_flags & PR_IP4)) { 2857 mtx_unlock(&pr->pr_mtx); 2858 return (0); 2859 } 2860 if (pr->pr_ip4 == NULL) { 2861 mtx_unlock(&pr->pr_mtx); 2862 return (EAFNOSUPPORT); 2863 } 2864 2865 ia0.s_addr = ntohl(ia->s_addr); 2866 if (ia0.s_addr == INADDR_LOOPBACK) { 2867 ia->s_addr = pr->pr_ip4[0].s_addr; 2868 mtx_unlock(&pr->pr_mtx); 2869 return (0); 2870 } 2871 2872 if (ia0.s_addr == INADDR_ANY) { 2873 /* 2874 * In case there is only 1 IPv4 address, bind directly. 2875 */ 2876 if (pr->pr_ip4s == 1) 2877 ia->s_addr = pr->pr_ip4[0].s_addr; 2878 mtx_unlock(&pr->pr_mtx); 2879 return (0); 2880 } 2881 2882 error = _prison_check_ip4(pr, ia); 2883 mtx_unlock(&pr->pr_mtx); 2884 return (error); 2885 } 2886 2887 /* 2888 * Rewrite destination address in case we will connect to loopback address. 2889 * 2890 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2891 * Address passed in in NBO and returned in NBO. 2892 */ 2893 int 2894 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2895 { 2896 struct prison *pr; 2897 2898 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2899 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2900 2901 pr = cred->cr_prison; 2902 if (!(pr->pr_flags & PR_IP4)) 2903 return (0); 2904 mtx_lock(&pr->pr_mtx); 2905 if (!(pr->pr_flags & PR_IP4)) { 2906 mtx_unlock(&pr->pr_mtx); 2907 return (0); 2908 } 2909 if (pr->pr_ip4 == NULL) { 2910 mtx_unlock(&pr->pr_mtx); 2911 return (EAFNOSUPPORT); 2912 } 2913 2914 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2915 ia->s_addr = pr->pr_ip4[0].s_addr; 2916 mtx_unlock(&pr->pr_mtx); 2917 return (0); 2918 } 2919 2920 /* 2921 * Return success because nothing had to be changed. 2922 */ 2923 mtx_unlock(&pr->pr_mtx); 2924 return (0); 2925 } 2926 2927 /* 2928 * Check if given address belongs to the jail referenced by cred/prison. 2929 * 2930 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2931 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2932 * doesn't allow IPv4. Address passed in in NBO. 2933 */ 2934 static int 2935 _prison_check_ip4(const struct prison *pr, const struct in_addr *ia) 2936 { 2937 int i, a, z, d; 2938 2939 /* 2940 * Check the primary IP. 2941 */ 2942 if (pr->pr_ip4[0].s_addr == ia->s_addr) 2943 return (0); 2944 2945 /* 2946 * All the other IPs are sorted so we can do a binary search. 2947 */ 2948 a = 0; 2949 z = pr->pr_ip4s - 2; 2950 while (a <= z) { 2951 i = (a + z) / 2; 2952 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 2953 if (d > 0) 2954 z = i - 1; 2955 else if (d < 0) 2956 a = i + 1; 2957 else 2958 return (0); 2959 } 2960 2961 return (EADDRNOTAVAIL); 2962 } 2963 2964 int 2965 prison_check_ip4(const struct ucred *cred, const struct in_addr *ia) 2966 { 2967 struct prison *pr; 2968 int error; 2969 2970 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2971 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2972 2973 pr = cred->cr_prison; 2974 if (!(pr->pr_flags & PR_IP4)) 2975 return (0); 2976 mtx_lock(&pr->pr_mtx); 2977 if (!(pr->pr_flags & PR_IP4)) { 2978 mtx_unlock(&pr->pr_mtx); 2979 return (0); 2980 } 2981 if (pr->pr_ip4 == NULL) { 2982 mtx_unlock(&pr->pr_mtx); 2983 return (EAFNOSUPPORT); 2984 } 2985 2986 error = _prison_check_ip4(pr, ia); 2987 mtx_unlock(&pr->pr_mtx); 2988 return (error); 2989 } 2990 #endif 2991 2992 #ifdef INET6 2993 static int 2994 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 2995 { 2996 int ii, ij, used; 2997 struct prison *ppr; 2998 2999 ppr = pr->pr_parent; 3000 if (!(pr->pr_flags & PR_IP6_USER)) { 3001 /* This has no user settings, so just copy the parent's list. */ 3002 if (pr->pr_ip6s < ppr->pr_ip6s) { 3003 /* 3004 * There's no room for the parent's list. Use the 3005 * new list buffer, which is assumed to be big enough 3006 * (if it was passed). If there's no buffer, try to 3007 * allocate one. 3008 */ 3009 used = 1; 3010 if (newip6 == NULL) { 3011 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 3012 M_PRISON, M_NOWAIT); 3013 if (newip6 != NULL) 3014 used = 0; 3015 } 3016 if (newip6 != NULL) { 3017 bcopy(ppr->pr_ip6, newip6, 3018 ppr->pr_ip6s * sizeof(*newip6)); 3019 free(pr->pr_ip6, M_PRISON); 3020 pr->pr_ip6 = newip6; 3021 pr->pr_ip6s = ppr->pr_ip6s; 3022 } 3023 return (used); 3024 } 3025 pr->pr_ip6s = ppr->pr_ip6s; 3026 if (pr->pr_ip6s > 0) 3027 bcopy(ppr->pr_ip6, pr->pr_ip6, 3028 pr->pr_ip6s * sizeof(*newip6)); 3029 else if (pr->pr_ip6 != NULL) { 3030 free(pr->pr_ip6, M_PRISON); 3031 pr->pr_ip6 = NULL; 3032 } 3033 } else if (pr->pr_ip6s > 0) { 3034 /* Remove addresses that aren't in the parent. */ 3035 for (ij = 0; ij < ppr->pr_ip6s; ij++) 3036 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 3037 &ppr->pr_ip6[ij])) 3038 break; 3039 if (ij < ppr->pr_ip6s) 3040 ii = 1; 3041 else { 3042 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 3043 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 3044 ii = 0; 3045 } 3046 for (ij = 1; ii < pr->pr_ip6s; ) { 3047 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 3048 &ppr->pr_ip6[0])) { 3049 ii++; 3050 continue; 3051 } 3052 switch (ij >= ppr->pr_ip6s ? -1 : 3053 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 3054 case -1: 3055 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 3056 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 3057 break; 3058 case 0: 3059 ii++; 3060 ij++; 3061 break; 3062 case 1: 3063 ij++; 3064 break; 3065 } 3066 } 3067 if (pr->pr_ip6s == 0) { 3068 pr->pr_flags |= PR_IP6_DISABLE; 3069 free(pr->pr_ip6, M_PRISON); 3070 pr->pr_ip6 = NULL; 3071 } 3072 } 3073 return 0; 3074 } 3075 3076 /* 3077 * Pass back primary IPv6 address for this jail. 3078 * 3079 * If not restricted return success but do not alter the address. Caller has 3080 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3081 * 3082 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3083 */ 3084 int 3085 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3086 { 3087 struct prison *pr; 3088 3089 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3090 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3091 3092 pr = cred->cr_prison; 3093 if (!(pr->pr_flags & PR_IP6)) 3094 return (0); 3095 mtx_lock(&pr->pr_mtx); 3096 if (!(pr->pr_flags & PR_IP6)) { 3097 mtx_unlock(&pr->pr_mtx); 3098 return (0); 3099 } 3100 if (pr->pr_ip6 == NULL) { 3101 mtx_unlock(&pr->pr_mtx); 3102 return (EAFNOSUPPORT); 3103 } 3104 3105 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3106 mtx_unlock(&pr->pr_mtx); 3107 return (0); 3108 } 3109 3110 /* 3111 * Return 1 if we should do proper source address selection or are not jailed. 3112 * We will return 0 if we should bypass source address selection in favour 3113 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3114 * returned in NBO. 3115 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3116 */ 3117 int 3118 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3119 { 3120 struct prison *pr; 3121 struct in6_addr lia6; 3122 int error; 3123 3124 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3125 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3126 3127 if (!jailed(cred)) 3128 return (1); 3129 3130 pr = cred->cr_prison; 3131 if (pr->pr_flags & PR_IP6_SADDRSEL) 3132 return (1); 3133 3134 lia6 = in6addr_any; 3135 error = prison_get_ip6(cred, &lia6); 3136 if (error) 3137 return (error); 3138 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3139 return (1); 3140 3141 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3142 return (0); 3143 } 3144 3145 /* 3146 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3147 */ 3148 int 3149 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3150 { 3151 3152 if (pr1 == pr2) 3153 return (1); 3154 3155 while (pr1 != &prison0 && 3156 #ifdef VIMAGE 3157 !(pr1->pr_flags & PR_VNET) && 3158 #endif 3159 !(pr1->pr_flags & PR_IP6_USER)) 3160 pr1 = pr1->pr_parent; 3161 while (pr2 != &prison0 && 3162 #ifdef VIMAGE 3163 !(pr2->pr_flags & PR_VNET) && 3164 #endif 3165 !(pr2->pr_flags & PR_IP6_USER)) 3166 pr2 = pr2->pr_parent; 3167 return (pr1 == pr2); 3168 } 3169 3170 /* 3171 * Make sure our (source) address is set to something meaningful to this jail. 3172 * 3173 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3174 * when needed while binding. 3175 * 3176 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3177 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3178 * doesn't allow IPv6. 3179 */ 3180 int 3181 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3182 { 3183 struct prison *pr; 3184 int error; 3185 3186 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3187 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3188 3189 pr = cred->cr_prison; 3190 if (!(pr->pr_flags & PR_IP6)) 3191 return (0); 3192 mtx_lock(&pr->pr_mtx); 3193 if (!(pr->pr_flags & PR_IP6)) { 3194 mtx_unlock(&pr->pr_mtx); 3195 return (0); 3196 } 3197 if (pr->pr_ip6 == NULL) { 3198 mtx_unlock(&pr->pr_mtx); 3199 return (EAFNOSUPPORT); 3200 } 3201 3202 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3203 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3204 mtx_unlock(&pr->pr_mtx); 3205 return (0); 3206 } 3207 3208 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3209 /* 3210 * In case there is only 1 IPv6 address, and v6only is true, 3211 * then bind directly. 3212 */ 3213 if (v6only != 0 && pr->pr_ip6s == 1) 3214 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3215 mtx_unlock(&pr->pr_mtx); 3216 return (0); 3217 } 3218 3219 error = _prison_check_ip6(pr, ia6); 3220 mtx_unlock(&pr->pr_mtx); 3221 return (error); 3222 } 3223 3224 /* 3225 * Rewrite destination address in case we will connect to loopback address. 3226 * 3227 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3228 */ 3229 int 3230 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3231 { 3232 struct prison *pr; 3233 3234 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3235 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3236 3237 pr = cred->cr_prison; 3238 if (!(pr->pr_flags & PR_IP6)) 3239 return (0); 3240 mtx_lock(&pr->pr_mtx); 3241 if (!(pr->pr_flags & PR_IP6)) { 3242 mtx_unlock(&pr->pr_mtx); 3243 return (0); 3244 } 3245 if (pr->pr_ip6 == NULL) { 3246 mtx_unlock(&pr->pr_mtx); 3247 return (EAFNOSUPPORT); 3248 } 3249 3250 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3251 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3252 mtx_unlock(&pr->pr_mtx); 3253 return (0); 3254 } 3255 3256 /* 3257 * Return success because nothing had to be changed. 3258 */ 3259 mtx_unlock(&pr->pr_mtx); 3260 return (0); 3261 } 3262 3263 /* 3264 * Check if given address belongs to the jail referenced by cred/prison. 3265 * 3266 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3267 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3268 * doesn't allow IPv6. 3269 */ 3270 static int 3271 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3272 { 3273 int i, a, z, d; 3274 3275 /* 3276 * Check the primary IP. 3277 */ 3278 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3279 return (0); 3280 3281 /* 3282 * All the other IPs are sorted so we can do a binary search. 3283 */ 3284 a = 0; 3285 z = pr->pr_ip6s - 2; 3286 while (a <= z) { 3287 i = (a + z) / 2; 3288 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3289 if (d > 0) 3290 z = i - 1; 3291 else if (d < 0) 3292 a = i + 1; 3293 else 3294 return (0); 3295 } 3296 3297 return (EADDRNOTAVAIL); 3298 } 3299 3300 int 3301 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3302 { 3303 struct prison *pr; 3304 int error; 3305 3306 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3307 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3308 3309 pr = cred->cr_prison; 3310 if (!(pr->pr_flags & PR_IP6)) 3311 return (0); 3312 mtx_lock(&pr->pr_mtx); 3313 if (!(pr->pr_flags & PR_IP6)) { 3314 mtx_unlock(&pr->pr_mtx); 3315 return (0); 3316 } 3317 if (pr->pr_ip6 == NULL) { 3318 mtx_unlock(&pr->pr_mtx); 3319 return (EAFNOSUPPORT); 3320 } 3321 3322 error = _prison_check_ip6(pr, ia6); 3323 mtx_unlock(&pr->pr_mtx); 3324 return (error); 3325 } 3326 #endif 3327 3328 /* 3329 * Check if a jail supports the given address family. 3330 * 3331 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3332 * if not. 3333 */ 3334 int 3335 prison_check_af(struct ucred *cred, int af) 3336 { 3337 struct prison *pr; 3338 int error; 3339 3340 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3341 3342 pr = cred->cr_prison; 3343 #ifdef VIMAGE 3344 /* Prisons with their own network stack are not limited. */ 3345 if (prison_owns_vnet(cred)) 3346 return (0); 3347 #endif 3348 3349 error = 0; 3350 switch (af) 3351 { 3352 #ifdef INET 3353 case AF_INET: 3354 if (pr->pr_flags & PR_IP4) 3355 { 3356 mtx_lock(&pr->pr_mtx); 3357 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3358 error = EAFNOSUPPORT; 3359 mtx_unlock(&pr->pr_mtx); 3360 } 3361 break; 3362 #endif 3363 #ifdef INET6 3364 case AF_INET6: 3365 if (pr->pr_flags & PR_IP6) 3366 { 3367 mtx_lock(&pr->pr_mtx); 3368 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3369 error = EAFNOSUPPORT; 3370 mtx_unlock(&pr->pr_mtx); 3371 } 3372 break; 3373 #endif 3374 case AF_LOCAL: 3375 case AF_ROUTE: 3376 break; 3377 default: 3378 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3379 error = EAFNOSUPPORT; 3380 } 3381 return (error); 3382 } 3383 3384 /* 3385 * Check if given address belongs to the jail referenced by cred (wrapper to 3386 * prison_check_ip[46]). 3387 * 3388 * Returns 0 if jail doesn't restrict the address family or if address belongs 3389 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3390 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3391 */ 3392 int 3393 prison_if(struct ucred *cred, struct sockaddr *sa) 3394 { 3395 #ifdef INET 3396 struct sockaddr_in *sai; 3397 #endif 3398 #ifdef INET6 3399 struct sockaddr_in6 *sai6; 3400 #endif 3401 int error; 3402 3403 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3404 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3405 3406 #ifdef VIMAGE 3407 if (prison_owns_vnet(cred)) 3408 return (0); 3409 #endif 3410 3411 error = 0; 3412 switch (sa->sa_family) 3413 { 3414 #ifdef INET 3415 case AF_INET: 3416 sai = (struct sockaddr_in *)sa; 3417 error = prison_check_ip4(cred, &sai->sin_addr); 3418 break; 3419 #endif 3420 #ifdef INET6 3421 case AF_INET6: 3422 sai6 = (struct sockaddr_in6 *)sa; 3423 error = prison_check_ip6(cred, &sai6->sin6_addr); 3424 break; 3425 #endif 3426 default: 3427 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3428 error = EAFNOSUPPORT; 3429 } 3430 return (error); 3431 } 3432 3433 /* 3434 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3435 */ 3436 int 3437 prison_check(struct ucred *cred1, struct ucred *cred2) 3438 { 3439 3440 return ((cred1->cr_prison == cred2->cr_prison || 3441 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3442 } 3443 3444 /* 3445 * Return 1 if p2 is a child of p1, otherwise 0. 3446 */ 3447 int 3448 prison_ischild(struct prison *pr1, struct prison *pr2) 3449 { 3450 3451 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3452 if (pr1 == pr2) 3453 return (1); 3454 return (0); 3455 } 3456 3457 /* 3458 * Return 1 if the passed credential is in a jail, otherwise 0. 3459 */ 3460 int 3461 jailed(struct ucred *cred) 3462 { 3463 3464 return (cred->cr_prison != &prison0); 3465 } 3466 3467 /* 3468 * Return 1 if the passed credential is in a jail and that jail does not 3469 * have its own virtual network stack, otherwise 0. 3470 */ 3471 int 3472 jailed_without_vnet(struct ucred *cred) 3473 { 3474 3475 if (!jailed(cred)) 3476 return (0); 3477 #ifdef VIMAGE 3478 if (prison_owns_vnet(cred)) 3479 return (0); 3480 #endif 3481 3482 return (1); 3483 } 3484 3485 /* 3486 * Return the correct hostname (domainname, et al) for the passed credential. 3487 */ 3488 void 3489 getcredhostname(struct ucred *cred, char *buf, size_t size) 3490 { 3491 struct prison *pr; 3492 3493 /* 3494 * A NULL credential can be used to shortcut to the physical 3495 * system's hostname. 3496 */ 3497 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3498 mtx_lock(&pr->pr_mtx); 3499 strlcpy(buf, pr->pr_hostname, size); 3500 mtx_unlock(&pr->pr_mtx); 3501 } 3502 3503 void 3504 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3505 { 3506 3507 mtx_lock(&cred->cr_prison->pr_mtx); 3508 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3509 mtx_unlock(&cred->cr_prison->pr_mtx); 3510 } 3511 3512 void 3513 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3514 { 3515 3516 mtx_lock(&cred->cr_prison->pr_mtx); 3517 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3518 mtx_unlock(&cred->cr_prison->pr_mtx); 3519 } 3520 3521 void 3522 getcredhostid(struct ucred *cred, unsigned long *hostid) 3523 { 3524 3525 mtx_lock(&cred->cr_prison->pr_mtx); 3526 *hostid = cred->cr_prison->pr_hostid; 3527 mtx_unlock(&cred->cr_prison->pr_mtx); 3528 } 3529 3530 #ifdef VIMAGE 3531 /* 3532 * Determine whether the prison represented by cred owns 3533 * its vnet rather than having it inherited. 3534 * 3535 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3536 */ 3537 int 3538 prison_owns_vnet(struct ucred *cred) 3539 { 3540 3541 /* 3542 * vnets cannot be added/removed after jail creation, 3543 * so no need to lock here. 3544 */ 3545 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3546 } 3547 #endif 3548 3549 /* 3550 * Determine whether the subject represented by cred can "see" 3551 * status of a mount point. 3552 * Returns: 0 for permitted, ENOENT otherwise. 3553 * XXX: This function should be called cr_canseemount() and should be 3554 * placed in kern_prot.c. 3555 */ 3556 int 3557 prison_canseemount(struct ucred *cred, struct mount *mp) 3558 { 3559 struct prison *pr; 3560 struct statfs *sp; 3561 size_t len; 3562 3563 pr = cred->cr_prison; 3564 if (pr->pr_enforce_statfs == 0) 3565 return (0); 3566 if (pr->pr_root->v_mount == mp) 3567 return (0); 3568 if (pr->pr_enforce_statfs == 2) 3569 return (ENOENT); 3570 /* 3571 * If jail's chroot directory is set to "/" we should be able to see 3572 * all mount-points from inside a jail. 3573 * This is ugly check, but this is the only situation when jail's 3574 * directory ends with '/'. 3575 */ 3576 if (strcmp(pr->pr_path, "/") == 0) 3577 return (0); 3578 len = strlen(pr->pr_path); 3579 sp = &mp->mnt_stat; 3580 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3581 return (ENOENT); 3582 /* 3583 * Be sure that we don't have situation where jail's root directory 3584 * is "/some/path" and mount point is "/some/pathpath". 3585 */ 3586 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3587 return (ENOENT); 3588 return (0); 3589 } 3590 3591 void 3592 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3593 { 3594 char jpath[MAXPATHLEN]; 3595 struct prison *pr; 3596 size_t len; 3597 3598 pr = cred->cr_prison; 3599 if (pr->pr_enforce_statfs == 0) 3600 return; 3601 if (prison_canseemount(cred, mp) != 0) { 3602 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3603 strlcpy(sp->f_mntonname, "[restricted]", 3604 sizeof(sp->f_mntonname)); 3605 return; 3606 } 3607 if (pr->pr_root->v_mount == mp) { 3608 /* 3609 * Clear current buffer data, so we are sure nothing from 3610 * the valid path left there. 3611 */ 3612 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3613 *sp->f_mntonname = '/'; 3614 return; 3615 } 3616 /* 3617 * If jail's chroot directory is set to "/" we should be able to see 3618 * all mount-points from inside a jail. 3619 */ 3620 if (strcmp(pr->pr_path, "/") == 0) 3621 return; 3622 len = strlen(pr->pr_path); 3623 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3624 /* 3625 * Clear current buffer data, so we are sure nothing from 3626 * the valid path left there. 3627 */ 3628 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3629 if (*jpath == '\0') { 3630 /* Should never happen. */ 3631 *sp->f_mntonname = '/'; 3632 } else { 3633 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3634 } 3635 } 3636 3637 /* 3638 * Check with permission for a specific privilege is granted within jail. We 3639 * have a specific list of accepted privileges; the rest are denied. 3640 */ 3641 int 3642 prison_priv_check(struct ucred *cred, int priv) 3643 { 3644 3645 if (!jailed(cred)) 3646 return (0); 3647 3648 #ifdef VIMAGE 3649 /* 3650 * Privileges specific to prisons with a virtual network stack. 3651 * There might be a duplicate entry here in case the privilege 3652 * is only granted conditionally in the legacy jail case. 3653 */ 3654 switch (priv) { 3655 #ifdef notyet 3656 /* 3657 * NFS-specific privileges. 3658 */ 3659 case PRIV_NFS_DAEMON: 3660 case PRIV_NFS_LOCKD: 3661 #endif 3662 /* 3663 * Network stack privileges. 3664 */ 3665 case PRIV_NET_BRIDGE: 3666 case PRIV_NET_GRE: 3667 case PRIV_NET_BPF: 3668 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3669 case PRIV_NET_ROUTE: 3670 case PRIV_NET_TAP: 3671 case PRIV_NET_SETIFMTU: 3672 case PRIV_NET_SETIFFLAGS: 3673 case PRIV_NET_SETIFCAP: 3674 case PRIV_NET_SETIFDESCR: 3675 case PRIV_NET_SETIFNAME : 3676 case PRIV_NET_SETIFMETRIC: 3677 case PRIV_NET_SETIFPHYS: 3678 case PRIV_NET_SETIFMAC: 3679 case PRIV_NET_ADDMULTI: 3680 case PRIV_NET_DELMULTI: 3681 case PRIV_NET_HWIOCTL: 3682 case PRIV_NET_SETLLADDR: 3683 case PRIV_NET_ADDIFGROUP: 3684 case PRIV_NET_DELIFGROUP: 3685 case PRIV_NET_IFCREATE: 3686 case PRIV_NET_IFDESTROY: 3687 case PRIV_NET_ADDIFADDR: 3688 case PRIV_NET_DELIFADDR: 3689 case PRIV_NET_LAGG: 3690 case PRIV_NET_GIF: 3691 case PRIV_NET_SETIFVNET: 3692 case PRIV_NET_SETIFFIB: 3693 3694 /* 3695 * 802.11-related privileges. 3696 */ 3697 case PRIV_NET80211_GETKEY: 3698 #ifdef notyet 3699 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3700 #endif 3701 3702 #ifdef notyet 3703 /* 3704 * ATM privileges. 3705 */ 3706 case PRIV_NETATM_CFG: 3707 case PRIV_NETATM_ADD: 3708 case PRIV_NETATM_DEL: 3709 case PRIV_NETATM_SET: 3710 3711 /* 3712 * Bluetooth privileges. 3713 */ 3714 case PRIV_NETBLUETOOTH_RAW: 3715 #endif 3716 3717 /* 3718 * Netgraph and netgraph module privileges. 3719 */ 3720 case PRIV_NETGRAPH_CONTROL: 3721 #ifdef notyet 3722 case PRIV_NETGRAPH_TTY: 3723 #endif 3724 3725 /* 3726 * IPv4 and IPv6 privileges. 3727 */ 3728 case PRIV_NETINET_IPFW: 3729 case PRIV_NETINET_DIVERT: 3730 case PRIV_NETINET_PF: 3731 case PRIV_NETINET_DUMMYNET: 3732 case PRIV_NETINET_CARP: 3733 case PRIV_NETINET_MROUTE: 3734 case PRIV_NETINET_RAW: 3735 case PRIV_NETINET_ADDRCTRL6: 3736 case PRIV_NETINET_ND6: 3737 case PRIV_NETINET_SCOPE6: 3738 case PRIV_NETINET_ALIFETIME6: 3739 case PRIV_NETINET_IPSEC: 3740 case PRIV_NETINET_BINDANY: 3741 3742 #ifdef notyet 3743 /* 3744 * NCP privileges. 3745 */ 3746 case PRIV_NETNCP: 3747 3748 /* 3749 * SMB privileges. 3750 */ 3751 case PRIV_NETSMB: 3752 #endif 3753 3754 /* 3755 * No default: or deny here. 3756 * In case of no permit fall through to next switch(). 3757 */ 3758 if (cred->cr_prison->pr_flags & PR_VNET) 3759 return (0); 3760 } 3761 #endif /* VIMAGE */ 3762 3763 switch (priv) { 3764 3765 /* 3766 * Allow ktrace privileges for root in jail. 3767 */ 3768 case PRIV_KTRACE: 3769 3770 #if 0 3771 /* 3772 * Allow jailed processes to configure audit identity and 3773 * submit audit records (login, etc). In the future we may 3774 * want to further refine the relationship between audit and 3775 * jail. 3776 */ 3777 case PRIV_AUDIT_GETAUDIT: 3778 case PRIV_AUDIT_SETAUDIT: 3779 case PRIV_AUDIT_SUBMIT: 3780 #endif 3781 3782 /* 3783 * Allow jailed processes to manipulate process UNIX 3784 * credentials in any way they see fit. 3785 */ 3786 case PRIV_CRED_SETUID: 3787 case PRIV_CRED_SETEUID: 3788 case PRIV_CRED_SETGID: 3789 case PRIV_CRED_SETEGID: 3790 case PRIV_CRED_SETGROUPS: 3791 case PRIV_CRED_SETREUID: 3792 case PRIV_CRED_SETREGID: 3793 case PRIV_CRED_SETRESUID: 3794 case PRIV_CRED_SETRESGID: 3795 3796 /* 3797 * Jail implements visibility constraints already, so allow 3798 * jailed root to override uid/gid-based constraints. 3799 */ 3800 case PRIV_SEEOTHERGIDS: 3801 case PRIV_SEEOTHERUIDS: 3802 3803 /* 3804 * Jail implements inter-process debugging limits already, so 3805 * allow jailed root various debugging privileges. 3806 */ 3807 case PRIV_DEBUG_DIFFCRED: 3808 case PRIV_DEBUG_SUGID: 3809 case PRIV_DEBUG_UNPRIV: 3810 3811 /* 3812 * Allow jail to set various resource limits and login 3813 * properties, and for now, exceed process resource limits. 3814 */ 3815 case PRIV_PROC_LIMIT: 3816 case PRIV_PROC_SETLOGIN: 3817 case PRIV_PROC_SETRLIMIT: 3818 3819 /* 3820 * System V and POSIX IPC privileges are granted in jail. 3821 */ 3822 case PRIV_IPC_READ: 3823 case PRIV_IPC_WRITE: 3824 case PRIV_IPC_ADMIN: 3825 case PRIV_IPC_MSGSIZE: 3826 case PRIV_MQ_ADMIN: 3827 3828 /* 3829 * Jail operations within a jail work on child jails. 3830 */ 3831 case PRIV_JAIL_ATTACH: 3832 case PRIV_JAIL_SET: 3833 case PRIV_JAIL_REMOVE: 3834 3835 /* 3836 * Jail implements its own inter-process limits, so allow 3837 * root processes in jail to change scheduling on other 3838 * processes in the same jail. Likewise for signalling. 3839 */ 3840 case PRIV_SCHED_DIFFCRED: 3841 case PRIV_SCHED_CPUSET: 3842 case PRIV_SIGNAL_DIFFCRED: 3843 case PRIV_SIGNAL_SUGID: 3844 3845 /* 3846 * Allow jailed processes to write to sysctls marked as jail 3847 * writable. 3848 */ 3849 case PRIV_SYSCTL_WRITEJAIL: 3850 3851 /* 3852 * Allow root in jail to manage a variety of quota 3853 * properties. These should likely be conditional on a 3854 * configuration option. 3855 */ 3856 case PRIV_VFS_GETQUOTA: 3857 case PRIV_VFS_SETQUOTA: 3858 3859 /* 3860 * Since Jail relies on chroot() to implement file system 3861 * protections, grant many VFS privileges to root in jail. 3862 * Be careful to exclude mount-related and NFS-related 3863 * privileges. 3864 */ 3865 case PRIV_VFS_READ: 3866 case PRIV_VFS_WRITE: 3867 case PRIV_VFS_ADMIN: 3868 case PRIV_VFS_EXEC: 3869 case PRIV_VFS_LOOKUP: 3870 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3871 case PRIV_VFS_CHFLAGS_DEV: 3872 case PRIV_VFS_CHOWN: 3873 case PRIV_VFS_CHROOT: 3874 case PRIV_VFS_RETAINSUGID: 3875 case PRIV_VFS_FCHROOT: 3876 case PRIV_VFS_LINK: 3877 case PRIV_VFS_SETGID: 3878 case PRIV_VFS_STAT: 3879 case PRIV_VFS_STICKYFILE: 3880 3881 /* 3882 * As in the non-jail case, non-root users are expected to be 3883 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3884 * exists in the jail and they have permission to access it). 3885 */ 3886 case PRIV_KMEM_READ: 3887 return (0); 3888 3889 /* 3890 * Depending on the global setting, allow privilege of 3891 * setting system flags. 3892 */ 3893 case PRIV_VFS_SYSFLAGS: 3894 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3895 return (0); 3896 else 3897 return (EPERM); 3898 3899 /* 3900 * Depending on the global setting, allow privilege of 3901 * mounting/unmounting file systems. 3902 */ 3903 case PRIV_VFS_MOUNT: 3904 case PRIV_VFS_UNMOUNT: 3905 case PRIV_VFS_MOUNT_NONUSER: 3906 case PRIV_VFS_MOUNT_OWNER: 3907 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3908 cred->cr_prison->pr_enforce_statfs < 2) 3909 return (0); 3910 else 3911 return (EPERM); 3912 3913 /* 3914 * Allow jailed root to bind reserved ports and reuse in-use 3915 * ports. 3916 */ 3917 case PRIV_NETINET_RESERVEDPORT: 3918 case PRIV_NETINET_REUSEPORT: 3919 return (0); 3920 3921 /* 3922 * Allow jailed root to set certian IPv4/6 (option) headers. 3923 */ 3924 case PRIV_NETINET_SETHDROPTS: 3925 return (0); 3926 3927 /* 3928 * Conditionally allow creating raw sockets in jail. 3929 */ 3930 case PRIV_NETINET_RAW: 3931 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3932 return (0); 3933 else 3934 return (EPERM); 3935 3936 /* 3937 * Since jail implements its own visibility limits on netstat 3938 * sysctls, allow getcred. This allows identd to work in 3939 * jail. 3940 */ 3941 case PRIV_NETINET_GETCRED: 3942 return (0); 3943 3944 /* 3945 * Allow jailed root to set loginclass. 3946 */ 3947 case PRIV_PROC_SETLOGINCLASS: 3948 return (0); 3949 3950 default: 3951 /* 3952 * In all remaining cases, deny the privilege request. This 3953 * includes almost all network privileges, many system 3954 * configuration privileges. 3955 */ 3956 return (EPERM); 3957 } 3958 } 3959 3960 /* 3961 * Return the part of pr2's name that is relative to pr1, or the whole name 3962 * if it does not directly follow. 3963 */ 3964 3965 char * 3966 prison_name(struct prison *pr1, struct prison *pr2) 3967 { 3968 char *name; 3969 3970 /* Jails see themselves as "0" (if they see themselves at all). */ 3971 if (pr1 == pr2) 3972 return "0"; 3973 name = pr2->pr_name; 3974 if (prison_ischild(pr1, pr2)) { 3975 /* 3976 * pr1 isn't locked (and allprison_lock may not be either) 3977 * so its length can't be counted on. But the number of dots 3978 * can be counted on - and counted. 3979 */ 3980 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3981 name = strchr(name, '.') + 1; 3982 } 3983 return (name); 3984 } 3985 3986 /* 3987 * Return the part of pr2's path that is relative to pr1, or the whole path 3988 * if it does not directly follow. 3989 */ 3990 static char * 3991 prison_path(struct prison *pr1, struct prison *pr2) 3992 { 3993 char *path1, *path2; 3994 int len1; 3995 3996 path1 = pr1->pr_path; 3997 path2 = pr2->pr_path; 3998 if (!strcmp(path1, "/")) 3999 return (path2); 4000 len1 = strlen(path1); 4001 if (strncmp(path1, path2, len1)) 4002 return (path2); 4003 if (path2[len1] == '\0') 4004 return "/"; 4005 if (path2[len1] == '/') 4006 return (path2 + len1); 4007 return (path2); 4008 } 4009 4010 4011 /* 4012 * Jail-related sysctls. 4013 */ 4014 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 4015 "Jails"); 4016 4017 static int 4018 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4019 { 4020 struct xprison *xp; 4021 struct prison *pr, *cpr; 4022 #ifdef INET 4023 struct in_addr *ip4 = NULL; 4024 int ip4s = 0; 4025 #endif 4026 #ifdef INET6 4027 struct in6_addr *ip6 = NULL; 4028 int ip6s = 0; 4029 #endif 4030 int descend, error; 4031 4032 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4033 pr = req->td->td_ucred->cr_prison; 4034 error = 0; 4035 sx_slock(&allprison_lock); 4036 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4037 #if defined(INET) || defined(INET6) 4038 again: 4039 #endif 4040 mtx_lock(&cpr->pr_mtx); 4041 #ifdef INET 4042 if (cpr->pr_ip4s > 0) { 4043 if (ip4s < cpr->pr_ip4s) { 4044 ip4s = cpr->pr_ip4s; 4045 mtx_unlock(&cpr->pr_mtx); 4046 ip4 = realloc(ip4, ip4s * 4047 sizeof(struct in_addr), M_TEMP, M_WAITOK); 4048 goto again; 4049 } 4050 bcopy(cpr->pr_ip4, ip4, 4051 cpr->pr_ip4s * sizeof(struct in_addr)); 4052 } 4053 #endif 4054 #ifdef INET6 4055 if (cpr->pr_ip6s > 0) { 4056 if (ip6s < cpr->pr_ip6s) { 4057 ip6s = cpr->pr_ip6s; 4058 mtx_unlock(&cpr->pr_mtx); 4059 ip6 = realloc(ip6, ip6s * 4060 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 4061 goto again; 4062 } 4063 bcopy(cpr->pr_ip6, ip6, 4064 cpr->pr_ip6s * sizeof(struct in6_addr)); 4065 } 4066 #endif 4067 if (cpr->pr_ref == 0) { 4068 mtx_unlock(&cpr->pr_mtx); 4069 continue; 4070 } 4071 bzero(xp, sizeof(*xp)); 4072 xp->pr_version = XPRISON_VERSION; 4073 xp->pr_id = cpr->pr_id; 4074 xp->pr_state = cpr->pr_uref > 0 4075 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4076 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4077 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4078 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4079 #ifdef INET 4080 xp->pr_ip4s = cpr->pr_ip4s; 4081 #endif 4082 #ifdef INET6 4083 xp->pr_ip6s = cpr->pr_ip6s; 4084 #endif 4085 mtx_unlock(&cpr->pr_mtx); 4086 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4087 if (error) 4088 break; 4089 #ifdef INET 4090 if (xp->pr_ip4s > 0) { 4091 error = SYSCTL_OUT(req, ip4, 4092 xp->pr_ip4s * sizeof(struct in_addr)); 4093 if (error) 4094 break; 4095 } 4096 #endif 4097 #ifdef INET6 4098 if (xp->pr_ip6s > 0) { 4099 error = SYSCTL_OUT(req, ip6, 4100 xp->pr_ip6s * sizeof(struct in6_addr)); 4101 if (error) 4102 break; 4103 } 4104 #endif 4105 } 4106 sx_sunlock(&allprison_lock); 4107 free(xp, M_TEMP); 4108 #ifdef INET 4109 free(ip4, M_TEMP); 4110 #endif 4111 #ifdef INET6 4112 free(ip6, M_TEMP); 4113 #endif 4114 return (error); 4115 } 4116 4117 SYSCTL_OID(_security_jail, OID_AUTO, list, 4118 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4119 sysctl_jail_list, "S", "List of active jails"); 4120 4121 static int 4122 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4123 { 4124 int error, injail; 4125 4126 injail = jailed(req->td->td_ucred); 4127 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4128 4129 return (error); 4130 } 4131 4132 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4133 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4134 sysctl_jail_jailed, "I", "Process in jail?"); 4135 4136 static int 4137 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4138 { 4139 int error, havevnet; 4140 #ifdef VIMAGE 4141 struct ucred *cred = req->td->td_ucred; 4142 4143 havevnet = jailed(cred) && prison_owns_vnet(cred); 4144 #else 4145 havevnet = 0; 4146 #endif 4147 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4148 4149 return (error); 4150 } 4151 4152 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4153 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4154 sysctl_jail_vnet, "I", "Jail owns VNET?"); 4155 4156 #if defined(INET) || defined(INET6) 4157 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4158 &jail_max_af_ips, 0, 4159 "Number of IP addresses a jail may have at most per address family"); 4160 #endif 4161 4162 /* 4163 * Default parameters for jail(2) compatability. For historical reasons, 4164 * the sysctl names have varying similarity to the parameter names. Prisons 4165 * just see their own parameters, and can't change them. 4166 */ 4167 static int 4168 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4169 { 4170 struct prison *pr; 4171 int allow, error, i; 4172 4173 pr = req->td->td_ucred->cr_prison; 4174 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4175 4176 /* Get the current flag value, and convert it to a boolean. */ 4177 i = (allow & arg2) ? 1 : 0; 4178 if (arg1 != NULL) 4179 i = !i; 4180 error = sysctl_handle_int(oidp, &i, 0, req); 4181 if (error || !req->newptr) 4182 return (error); 4183 i = i ? arg2 : 0; 4184 if (arg1 != NULL) 4185 i ^= arg2; 4186 /* 4187 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4188 * for writing. 4189 */ 4190 mtx_lock(&prison0.pr_mtx); 4191 jail_default_allow = (jail_default_allow & ~arg2) | i; 4192 mtx_unlock(&prison0.pr_mtx); 4193 return (0); 4194 } 4195 4196 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4197 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4198 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4199 "Processes in jail can set their hostnames"); 4200 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4201 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4202 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4203 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 4204 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4205 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4206 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4207 "Processes in jail can use System V IPC primitives"); 4208 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4209 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4210 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4211 "Prison root can create raw sockets"); 4212 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4213 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4214 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4215 "Processes in jail can alter system file flags"); 4216 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4217 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4218 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4219 "Processes in jail can mount/unmount jail-friendly file systems"); 4220 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 4221 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4222 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 4223 "Processes in jail can mount the devfs file system"); 4224 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 4225 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4226 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 4227 "Processes in jail can mount the nullfs file system"); 4228 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 4229 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4230 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 4231 "Processes in jail can mount the procfs file system"); 4232 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed, 4233 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4234 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I", 4235 "Processes in jail can mount the tmpfs file system"); 4236 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 4237 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4238 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 4239 "Processes in jail can mount the zfs file system"); 4240 4241 static int 4242 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4243 { 4244 struct prison *pr; 4245 int level, error; 4246 4247 pr = req->td->td_ucred->cr_prison; 4248 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4249 error = sysctl_handle_int(oidp, &level, 0, req); 4250 if (error || !req->newptr) 4251 return (error); 4252 *(int *)arg1 = level; 4253 return (0); 4254 } 4255 4256 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4257 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4258 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4259 sysctl_jail_default_level, "I", 4260 "Processes in jail cannot see all mounted file systems"); 4261 4262 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4263 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4264 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4265 sysctl_jail_default_level, "I", 4266 "Ruleset for the devfs filesystem in jail"); 4267 4268 /* 4269 * Nodes to describe jail parameters. Maximum length of string parameters 4270 * is returned in the string itself, and the other parameters exist merely 4271 * to make themselves and their types known. 4272 */ 4273 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4274 "Jail parameters"); 4275 4276 int 4277 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4278 { 4279 int i; 4280 long l; 4281 size_t s; 4282 char numbuf[12]; 4283 4284 switch (oidp->oid_kind & CTLTYPE) 4285 { 4286 case CTLTYPE_LONG: 4287 case CTLTYPE_ULONG: 4288 l = 0; 4289 #ifdef SCTL_MASK32 4290 if (!(req->flags & SCTL_MASK32)) 4291 #endif 4292 return (SYSCTL_OUT(req, &l, sizeof(l))); 4293 case CTLTYPE_INT: 4294 case CTLTYPE_UINT: 4295 i = 0; 4296 return (SYSCTL_OUT(req, &i, sizeof(i))); 4297 case CTLTYPE_STRING: 4298 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4299 return 4300 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4301 case CTLTYPE_STRUCT: 4302 s = (size_t)arg2; 4303 return (SYSCTL_OUT(req, &s, sizeof(s))); 4304 } 4305 return (0); 4306 } 4307 4308 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4309 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4310 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4311 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4312 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4313 "I", "Jail secure level"); 4314 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4315 "I", "Jail cannot see all mounted file systems"); 4316 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4317 "I", "Ruleset for in-jail devfs mounts"); 4318 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4319 "B", "Jail persistence"); 4320 #ifdef VIMAGE 4321 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4322 "E,jailsys", "Virtual network stack"); 4323 #endif 4324 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4325 "B", "Jail is in the process of shutting down"); 4326 4327 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4328 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4329 "I", "Current number of child jails"); 4330 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4331 "I", "Maximum number of child jails"); 4332 4333 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4334 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4335 "Jail hostname"); 4336 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4337 "Jail NIS domainname"); 4338 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4339 "Jail host UUID"); 4340 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4341 "LU", "Jail host ID"); 4342 4343 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4344 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4345 4346 #ifdef INET 4347 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4348 "Jail IPv4 address virtualization"); 4349 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4350 "S,in_addr,a", "Jail IPv4 addresses"); 4351 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4352 "B", "Do (not) use IPv4 source address selection rather than the " 4353 "primary jail IPv4 address."); 4354 #endif 4355 #ifdef INET6 4356 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4357 "Jail IPv6 address virtualization"); 4358 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4359 "S,in6_addr,a", "Jail IPv6 addresses"); 4360 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4361 "B", "Do (not) use IPv6 source address selection rather than the " 4362 "primary jail IPv6 address."); 4363 #endif 4364 4365 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4366 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4367 "B", "Jail may set hostname"); 4368 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4369 "B", "Jail may use SYSV IPC"); 4370 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4371 "B", "Jail may create raw sockets"); 4372 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4373 "B", "Jail may alter system file flags"); 4374 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4375 "B", "Jail may set file quotas"); 4376 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4377 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4378 4379 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4380 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4381 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4382 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 4383 "B", "Jail may mount the devfs file system"); 4384 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 4385 "B", "Jail may mount the nullfs file system"); 4386 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 4387 "B", "Jail may mount the procfs file system"); 4388 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW, 4389 "B", "Jail may mount the tmpfs file system"); 4390 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 4391 "B", "Jail may mount the zfs file system"); 4392 4393 void 4394 prison_racct_foreach(void (*callback)(struct racct *racct, 4395 void *arg2, void *arg3), void *arg2, void *arg3) 4396 { 4397 struct prison_racct *prr; 4398 4399 sx_slock(&allprison_lock); 4400 LIST_FOREACH(prr, &allprison_racct, prr_next) 4401 (callback)(prr->prr_racct, arg2, arg3); 4402 sx_sunlock(&allprison_lock); 4403 } 4404 4405 static struct prison_racct * 4406 prison_racct_find_locked(const char *name) 4407 { 4408 struct prison_racct *prr; 4409 4410 sx_assert(&allprison_lock, SA_XLOCKED); 4411 4412 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4413 return (NULL); 4414 4415 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4416 if (strcmp(name, prr->prr_name) != 0) 4417 continue; 4418 4419 /* Found prison_racct with a matching name? */ 4420 prison_racct_hold(prr); 4421 return (prr); 4422 } 4423 4424 /* Add new prison_racct. */ 4425 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4426 racct_create(&prr->prr_racct); 4427 4428 strcpy(prr->prr_name, name); 4429 refcount_init(&prr->prr_refcount, 1); 4430 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4431 4432 return (prr); 4433 } 4434 4435 struct prison_racct * 4436 prison_racct_find(const char *name) 4437 { 4438 struct prison_racct *prr; 4439 4440 sx_xlock(&allprison_lock); 4441 prr = prison_racct_find_locked(name); 4442 sx_xunlock(&allprison_lock); 4443 return (prr); 4444 } 4445 4446 void 4447 prison_racct_hold(struct prison_racct *prr) 4448 { 4449 4450 refcount_acquire(&prr->prr_refcount); 4451 } 4452 4453 static void 4454 prison_racct_free_locked(struct prison_racct *prr) 4455 { 4456 4457 sx_assert(&allprison_lock, SA_XLOCKED); 4458 4459 if (refcount_release(&prr->prr_refcount)) { 4460 racct_destroy(&prr->prr_racct); 4461 LIST_REMOVE(prr, prr_next); 4462 free(prr, M_PRISON_RACCT); 4463 } 4464 } 4465 4466 void 4467 prison_racct_free(struct prison_racct *prr) 4468 { 4469 int old; 4470 4471 sx_assert(&allprison_lock, SA_UNLOCKED); 4472 4473 old = prr->prr_refcount; 4474 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4475 return; 4476 4477 sx_xlock(&allprison_lock); 4478 prison_racct_free_locked(prr); 4479 sx_xunlock(&allprison_lock); 4480 } 4481 4482 #ifdef RACCT 4483 static void 4484 prison_racct_attach(struct prison *pr) 4485 { 4486 struct prison_racct *prr; 4487 4488 sx_assert(&allprison_lock, SA_XLOCKED); 4489 4490 prr = prison_racct_find_locked(pr->pr_name); 4491 KASSERT(prr != NULL, ("cannot find prison_racct")); 4492 4493 pr->pr_prison_racct = prr; 4494 } 4495 4496 /* 4497 * Handle jail renaming. From the racct point of view, renaming means 4498 * moving from one prison_racct to another. 4499 */ 4500 static void 4501 prison_racct_modify(struct prison *pr) 4502 { 4503 struct proc *p; 4504 struct ucred *cred; 4505 struct prison_racct *oldprr; 4506 4507 sx_slock(&allproc_lock); 4508 sx_xlock(&allprison_lock); 4509 4510 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4511 sx_xunlock(&allprison_lock); 4512 sx_sunlock(&allproc_lock); 4513 return; 4514 } 4515 4516 oldprr = pr->pr_prison_racct; 4517 pr->pr_prison_racct = NULL; 4518 4519 prison_racct_attach(pr); 4520 4521 /* 4522 * Move resource utilisation records. 4523 */ 4524 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4525 4526 /* 4527 * Force rctl to reattach rules to processes. 4528 */ 4529 FOREACH_PROC_IN_SYSTEM(p) { 4530 PROC_LOCK(p); 4531 cred = crhold(p->p_ucred); 4532 PROC_UNLOCK(p); 4533 racct_proc_ucred_changed(p, cred, cred); 4534 crfree(cred); 4535 } 4536 4537 sx_sunlock(&allproc_lock); 4538 prison_racct_free_locked(oldprr); 4539 sx_xunlock(&allprison_lock); 4540 } 4541 4542 static void 4543 prison_racct_detach(struct prison *pr) 4544 { 4545 4546 sx_assert(&allprison_lock, SA_UNLOCKED); 4547 4548 if (pr->pr_prison_racct == NULL) 4549 return; 4550 prison_racct_free(pr->pr_prison_racct); 4551 pr->pr_prison_racct = NULL; 4552 } 4553 #endif /* RACCT */ 4554 4555 #ifdef DDB 4556 4557 static void 4558 db_show_prison(struct prison *pr) 4559 { 4560 int fi; 4561 #if defined(INET) || defined(INET6) 4562 int ii; 4563 #endif 4564 unsigned jsf; 4565 #ifdef INET6 4566 char ip6buf[INET6_ADDRSTRLEN]; 4567 #endif 4568 4569 db_printf("prison %p:\n", pr); 4570 db_printf(" jid = %d\n", pr->pr_id); 4571 db_printf(" name = %s\n", pr->pr_name); 4572 db_printf(" parent = %p\n", pr->pr_parent); 4573 db_printf(" ref = %d\n", pr->pr_ref); 4574 db_printf(" uref = %d\n", pr->pr_uref); 4575 db_printf(" path = %s\n", pr->pr_path); 4576 db_printf(" cpuset = %d\n", pr->pr_cpuset 4577 ? pr->pr_cpuset->cs_id : -1); 4578 #ifdef VIMAGE 4579 db_printf(" vnet = %p\n", pr->pr_vnet); 4580 #endif 4581 db_printf(" root = %p\n", pr->pr_root); 4582 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4583 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4584 db_printf(" children.max = %d\n", pr->pr_childmax); 4585 db_printf(" children.cur = %d\n", pr->pr_childcount); 4586 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4587 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4588 db_printf(" flags = 0x%x", pr->pr_flags); 4589 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4590 fi++) 4591 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4592 db_printf(" %s", pr_flag_names[fi]); 4593 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4594 fi++) { 4595 jsf = pr->pr_flags & 4596 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4597 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4598 pr_flag_jailsys[fi].disable && 4599 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4600 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4601 : "inherit"); 4602 } 4603 db_printf(" allow = 0x%x", pr->pr_allow); 4604 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4605 fi++) 4606 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4607 db_printf(" %s", pr_allow_names[fi]); 4608 db_printf("\n"); 4609 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4610 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4611 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4612 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4613 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4614 #ifdef INET 4615 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4616 for (ii = 0; ii < pr->pr_ip4s; ii++) 4617 db_printf(" %s %s\n", 4618 ii == 0 ? "ip4.addr =" : " ", 4619 inet_ntoa(pr->pr_ip4[ii])); 4620 #endif 4621 #ifdef INET6 4622 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4623 for (ii = 0; ii < pr->pr_ip6s; ii++) 4624 db_printf(" %s %s\n", 4625 ii == 0 ? "ip6.addr =" : " ", 4626 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4627 #endif 4628 } 4629 4630 DB_SHOW_COMMAND(prison, db_show_prison_command) 4631 { 4632 struct prison *pr; 4633 4634 if (!have_addr) { 4635 /* 4636 * Show all prisons in the list, and prison0 which is not 4637 * listed. 4638 */ 4639 db_show_prison(&prison0); 4640 if (!db_pager_quit) { 4641 TAILQ_FOREACH(pr, &allprison, pr_list) { 4642 db_show_prison(pr); 4643 if (db_pager_quit) 4644 break; 4645 } 4646 } 4647 return; 4648 } 4649 4650 if (addr == 0) 4651 pr = &prison0; 4652 else { 4653 /* Look for a prison with the ID and with references. */ 4654 TAILQ_FOREACH(pr, &allprison, pr_list) 4655 if (pr->pr_id == addr && pr->pr_ref > 0) 4656 break; 4657 if (pr == NULL) 4658 /* Look again, without requiring a reference. */ 4659 TAILQ_FOREACH(pr, &allprison, pr_list) 4660 if (pr->pr_id == addr) 4661 break; 4662 if (pr == NULL) 4663 /* Assume address points to a valid prison. */ 4664 pr = (struct prison *)addr; 4665 } 4666 db_show_prison(pr); 4667 } 4668 4669 #endif /* DDB */ 4670