Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_jail.c
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1 /*- 2 * Copyright (c) 1999 Poul-Henning Kamp. 3 * Copyright (c) 2008 Bjoern A. Zeeb. 4 * Copyright (c) 2009 James Gritton. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_compat.h" 33 #include "opt_ddb.h" 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/kernel.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/sysproto.h> 43 #include <sys/malloc.h> 44 #include <sys/osd.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/taskqueue.h> 48 #include <sys/fcntl.h> 49 #include <sys/jail.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/racct.h> 53 #include <sys/refcount.h> 54 #include <sys/sx.h> 55 #include <sys/sysent.h> 56 #include <sys/namei.h> 57 #include <sys/mount.h> 58 #include <sys/queue.h> 59 #include <sys/socket.h> 60 #include <sys/syscallsubr.h> 61 #include <sys/sysctl.h> 62 #include <sys/vnode.h> 63 64 #include <net/if.h> 65 #include <net/vnet.h> 66 67 #include <netinet/in.h> 68 69 #ifdef DDB 70 #include <ddb/ddb.h> 71 #ifdef INET6 72 #include <netinet6/in6_var.h> 73 #endif /* INET6 */ 74 #endif /* DDB */ 75 76 #include <security/mac/mac_framework.h> 77 78 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 79 80 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 81 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 82 83 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 84 #ifdef INET 85 #ifdef INET6 86 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 87 #else 88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 89 #endif 90 #else /* !INET */ 91 #ifdef INET6 92 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 93 #else 94 #define _PR_IP_SADDRSEL 0 95 #endif 96 #endif 97 98 /* prison0 describes what is "real" about the system. */ 99 struct prison prison0 = { 100 .pr_id = 0, 101 .pr_name = "", 102 .pr_ref = 1, 103 .pr_uref = 1, 104 .pr_path = "/", 105 .pr_securelevel = -1, 106 .pr_devfs_rsnum = 0, 107 .pr_childmax = JAIL_MAX, 108 .pr_hostuuid = DEFAULT_HOSTUUID, 109 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 110 #ifdef VIMAGE 111 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 112 #else 113 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 114 #endif 115 .pr_allow = PR_ALLOW_ALL, 116 }; 117 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 118 119 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 120 struct sx allprison_lock; 121 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 122 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 123 LIST_HEAD(, prison_racct) allprison_racct; 124 int lastprid = 0; 125 126 static int do_jail_attach(struct thread *td, struct prison *pr); 127 static void prison_complete(void *context, int pending); 128 static void prison_deref(struct prison *pr, int flags); 129 static char *prison_path(struct prison *pr1, struct prison *pr2); 130 static void prison_remove_one(struct prison *pr); 131 #ifdef RACCT 132 static void prison_racct_attach(struct prison *pr); 133 static void prison_racct_modify(struct prison *pr); 134 static void prison_racct_detach(struct prison *pr); 135 #endif 136 #ifdef INET 137 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia); 138 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4); 139 #endif 140 #ifdef INET6 141 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6); 142 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6); 143 #endif 144 145 /* Flags for prison_deref */ 146 #define PD_DEREF 0x01 147 #define PD_DEUREF 0x02 148 #define PD_LOCKED 0x04 149 #define PD_LIST_SLOCKED 0x08 150 #define PD_LIST_XLOCKED 0x10 151 152 /* 153 * Parameter names corresponding to PR_* flag values. Size values are for kvm 154 * as we cannot figure out the size of a sparse array, or an array without a 155 * terminating entry. 156 */ 157 static char *pr_flag_names[] = { 158 [0] = "persist", 159 #ifdef INET 160 [7] = "ip4.saddrsel", 161 #endif 162 #ifdef INET6 163 [8] = "ip6.saddrsel", 164 #endif 165 }; 166 const size_t pr_flag_names_size = sizeof(pr_flag_names); 167 168 static char *pr_flag_nonames[] = { 169 [0] = "nopersist", 170 #ifdef INET 171 [7] = "ip4.nosaddrsel", 172 #endif 173 #ifdef INET6 174 [8] = "ip6.nosaddrsel", 175 #endif 176 }; 177 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames); 178 179 struct jailsys_flags { 180 const char *name; 181 unsigned disable; 182 unsigned new; 183 } pr_flag_jailsys[] = { 184 { "host", 0, PR_HOST }, 185 #ifdef VIMAGE 186 { "vnet", 0, PR_VNET }, 187 #endif 188 #ifdef INET 189 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER }, 190 #endif 191 #ifdef INET6 192 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER }, 193 #endif 194 }; 195 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 196 197 static char *pr_allow_names[] = { 198 "allow.set_hostname", 199 "allow.sysvipc", 200 "allow.raw_sockets", 201 "allow.chflags", 202 "allow.mount", 203 "allow.quotas", 204 "allow.socket_af", 205 "allow.mount.devfs", 206 "allow.mount.nullfs", 207 "allow.mount.zfs", 208 "allow.mount.procfs", 209 }; 210 const size_t pr_allow_names_size = sizeof(pr_allow_names); 211 212 static char *pr_allow_nonames[] = { 213 "allow.noset_hostname", 214 "allow.nosysvipc", 215 "allow.noraw_sockets", 216 "allow.nochflags", 217 "allow.nomount", 218 "allow.noquotas", 219 "allow.nosocket_af", 220 "allow.mount.nodevfs", 221 "allow.mount.nonullfs", 222 "allow.mount.nozfs", 223 "allow.mount.noprocfs", 224 }; 225 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames); 226 227 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 228 #define JAIL_DEFAULT_ENFORCE_STATFS 2 229 #define JAIL_DEFAULT_DEVFS_RSNUM 0 230 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 231 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 232 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 233 #if defined(INET) || defined(INET6) 234 static unsigned jail_max_af_ips = 255; 235 #endif 236 237 #ifdef INET 238 static int 239 qcmp_v4(const void *ip1, const void *ip2) 240 { 241 in_addr_t iaa, iab; 242 243 /* 244 * We need to compare in HBO here to get the list sorted as expected 245 * by the result of the code. Sorting NBO addresses gives you 246 * interesting results. If you do not understand, do not try. 247 */ 248 iaa = ntohl(((const struct in_addr *)ip1)->s_addr); 249 iab = ntohl(((const struct in_addr *)ip2)->s_addr); 250 251 /* 252 * Do not simply return the difference of the two numbers, the int is 253 * not wide enough. 254 */ 255 if (iaa > iab) 256 return (1); 257 else if (iaa < iab) 258 return (-1); 259 else 260 return (0); 261 } 262 #endif 263 264 #ifdef INET6 265 static int 266 qcmp_v6(const void *ip1, const void *ip2) 267 { 268 const struct in6_addr *ia6a, *ia6b; 269 int i, rc; 270 271 ia6a = (const struct in6_addr *)ip1; 272 ia6b = (const struct in6_addr *)ip2; 273 274 rc = 0; 275 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 276 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 277 rc = 1; 278 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 279 rc = -1; 280 } 281 return (rc); 282 } 283 #endif 284 285 /* 286 * struct jail_args { 287 * struct jail *jail; 288 * }; 289 */ 290 int 291 sys_jail(struct thread *td, struct jail_args *uap) 292 { 293 uint32_t version; 294 int error; 295 struct jail j; 296 297 error = copyin(uap->jail, &version, sizeof(uint32_t)); 298 if (error) 299 return (error); 300 301 switch (version) { 302 case 0: 303 { 304 struct jail_v0 j0; 305 306 /* FreeBSD single IPv4 jails. */ 307 bzero(&j, sizeof(struct jail)); 308 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 309 if (error) 310 return (error); 311 j.version = j0.version; 312 j.path = j0.path; 313 j.hostname = j0.hostname; 314 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 315 break; 316 } 317 318 case 1: 319 /* 320 * Version 1 was used by multi-IPv4 jail implementations 321 * that never made it into the official kernel. 322 */ 323 return (EINVAL); 324 325 case 2: /* JAIL_API_VERSION */ 326 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 327 error = copyin(uap->jail, &j, sizeof(struct jail)); 328 if (error) 329 return (error); 330 break; 331 332 default: 333 /* Sci-Fi jails are not supported, sorry. */ 334 return (EINVAL); 335 } 336 return (kern_jail(td, &j)); 337 } 338 339 int 340 kern_jail(struct thread *td, struct jail *j) 341 { 342 struct iovec optiov[2 * (4 343 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0]) 344 #ifdef INET 345 + 1 346 #endif 347 #ifdef INET6 348 + 1 349 #endif 350 )]; 351 struct uio opt; 352 char *u_path, *u_hostname, *u_name; 353 #ifdef INET 354 uint32_t ip4s; 355 struct in_addr *u_ip4; 356 #endif 357 #ifdef INET6 358 struct in6_addr *u_ip6; 359 #endif 360 size_t tmplen; 361 int error, enforce_statfs, fi; 362 363 bzero(&optiov, sizeof(optiov)); 364 opt.uio_iov = optiov; 365 opt.uio_iovcnt = 0; 366 opt.uio_offset = -1; 367 opt.uio_resid = -1; 368 opt.uio_segflg = UIO_SYSSPACE; 369 opt.uio_rw = UIO_READ; 370 opt.uio_td = td; 371 372 /* Set permissions for top-level jails from sysctls. */ 373 if (!jailed(td->td_ucred)) { 374 for (fi = 0; fi < sizeof(pr_allow_names) / 375 sizeof(pr_allow_names[0]); fi++) { 376 optiov[opt.uio_iovcnt].iov_base = 377 (jail_default_allow & (1 << fi)) 378 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 379 optiov[opt.uio_iovcnt].iov_len = 380 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 381 opt.uio_iovcnt += 2; 382 } 383 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 384 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 385 opt.uio_iovcnt++; 386 enforce_statfs = jail_default_enforce_statfs; 387 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 388 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 389 opt.uio_iovcnt++; 390 } 391 392 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 393 #ifdef INET 394 ip4s = (j->version == 0) ? 1 : j->ip4s; 395 if (ip4s > jail_max_af_ips) 396 return (EINVAL); 397 tmplen += ip4s * sizeof(struct in_addr); 398 #else 399 if (j->ip4s > 0) 400 return (EINVAL); 401 #endif 402 #ifdef INET6 403 if (j->ip6s > jail_max_af_ips) 404 return (EINVAL); 405 tmplen += j->ip6s * sizeof(struct in6_addr); 406 #else 407 if (j->ip6s > 0) 408 return (EINVAL); 409 #endif 410 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 411 u_hostname = u_path + MAXPATHLEN; 412 u_name = u_hostname + MAXHOSTNAMELEN; 413 #ifdef INET 414 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 415 #endif 416 #ifdef INET6 417 #ifdef INET 418 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 419 #else 420 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 421 #endif 422 #endif 423 optiov[opt.uio_iovcnt].iov_base = "path"; 424 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 425 opt.uio_iovcnt++; 426 optiov[opt.uio_iovcnt].iov_base = u_path; 427 error = copyinstr(j->path, u_path, MAXPATHLEN, 428 &optiov[opt.uio_iovcnt].iov_len); 429 if (error) { 430 free(u_path, M_TEMP); 431 return (error); 432 } 433 opt.uio_iovcnt++; 434 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 435 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 436 opt.uio_iovcnt++; 437 optiov[opt.uio_iovcnt].iov_base = u_hostname; 438 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 439 &optiov[opt.uio_iovcnt].iov_len); 440 if (error) { 441 free(u_path, M_TEMP); 442 return (error); 443 } 444 opt.uio_iovcnt++; 445 if (j->jailname != NULL) { 446 optiov[opt.uio_iovcnt].iov_base = "name"; 447 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 448 opt.uio_iovcnt++; 449 optiov[opt.uio_iovcnt].iov_base = u_name; 450 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 451 &optiov[opt.uio_iovcnt].iov_len); 452 if (error) { 453 free(u_path, M_TEMP); 454 return (error); 455 } 456 opt.uio_iovcnt++; 457 } 458 #ifdef INET 459 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 460 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 461 opt.uio_iovcnt++; 462 optiov[opt.uio_iovcnt].iov_base = u_ip4; 463 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 464 if (j->version == 0) 465 u_ip4->s_addr = j->ip4s; 466 else { 467 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 468 if (error) { 469 free(u_path, M_TEMP); 470 return (error); 471 } 472 } 473 opt.uio_iovcnt++; 474 #endif 475 #ifdef INET6 476 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 477 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 478 opt.uio_iovcnt++; 479 optiov[opt.uio_iovcnt].iov_base = u_ip6; 480 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 481 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 482 if (error) { 483 free(u_path, M_TEMP); 484 return (error); 485 } 486 opt.uio_iovcnt++; 487 #endif 488 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]), 489 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 490 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 491 free(u_path, M_TEMP); 492 return (error); 493 } 494 495 496 /* 497 * struct jail_set_args { 498 * struct iovec *iovp; 499 * unsigned int iovcnt; 500 * int flags; 501 * }; 502 */ 503 int 504 sys_jail_set(struct thread *td, struct jail_set_args *uap) 505 { 506 struct uio *auio; 507 int error; 508 509 /* Check that we have an even number of iovecs. */ 510 if (uap->iovcnt & 1) 511 return (EINVAL); 512 513 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 514 if (error) 515 return (error); 516 error = kern_jail_set(td, auio, uap->flags); 517 free(auio, M_IOV); 518 return (error); 519 } 520 521 int 522 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 523 { 524 struct nameidata nd; 525 #ifdef INET 526 struct in_addr *ip4; 527 #endif 528 #ifdef INET6 529 struct in6_addr *ip6; 530 #endif 531 struct vfsopt *opt; 532 struct vfsoptlist *opts; 533 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 534 struct vnode *root; 535 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 536 char *g_path; 537 #if defined(INET) || defined(INET6) 538 struct prison *tppr; 539 void *op; 540 #endif 541 unsigned long hid; 542 size_t namelen, onamelen; 543 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos; 544 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 545 int fi, jid, jsys, len, level; 546 int childmax, rsnum, slevel, vfslocked; 547 int fullpath_disabled; 548 #if defined(INET) || defined(INET6) 549 int ii, ij; 550 #endif 551 #ifdef INET 552 int ip4s, redo_ip4; 553 #endif 554 #ifdef INET6 555 int ip6s, redo_ip6; 556 #endif 557 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 558 unsigned tallow; 559 char numbuf[12]; 560 561 error = priv_check(td, PRIV_JAIL_SET); 562 if (!error && (flags & JAIL_ATTACH)) 563 error = priv_check(td, PRIV_JAIL_ATTACH); 564 if (error) 565 return (error); 566 mypr = ppr = td->td_ucred->cr_prison; 567 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 568 return (EPERM); 569 if (flags & ~JAIL_SET_MASK) 570 return (EINVAL); 571 572 /* 573 * Check all the parameters before committing to anything. Not all 574 * errors can be caught early, but we may as well try. Also, this 575 * takes care of some expensive stuff (path lookup) before getting 576 * the allprison lock. 577 * 578 * XXX Jails are not filesystems, and jail parameters are not mount 579 * options. But it makes more sense to re-use the vfsopt code 580 * than duplicate it under a different name. 581 */ 582 error = vfs_buildopts(optuio, &opts); 583 if (error) 584 return (error); 585 #ifdef INET 586 ip4 = NULL; 587 #endif 588 #ifdef INET6 589 ip6 = NULL; 590 #endif 591 g_path = NULL; 592 593 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 594 if (error == ENOENT) 595 jid = 0; 596 else if (error != 0) 597 goto done_free; 598 599 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 600 if (error == ENOENT) 601 gotslevel = 0; 602 else if (error != 0) 603 goto done_free; 604 else 605 gotslevel = 1; 606 607 error = 608 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 609 if (error == ENOENT) 610 gotchildmax = 0; 611 else if (error != 0) 612 goto done_free; 613 else 614 gotchildmax = 1; 615 616 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 617 if (error == ENOENT) 618 gotenforce = 0; 619 else if (error != 0) 620 goto done_free; 621 else if (enforce < 0 || enforce > 2) { 622 error = EINVAL; 623 goto done_free; 624 } else 625 gotenforce = 1; 626 627 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 628 if (error == ENOENT) 629 gotrsnum = 0; 630 else if (error != 0) 631 goto done_free; 632 else 633 gotrsnum = 1; 634 635 pr_flags = ch_flags = 0; 636 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 637 fi++) { 638 if (pr_flag_names[fi] == NULL) 639 continue; 640 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 641 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 642 } 643 ch_flags |= pr_flags; 644 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 645 fi++) { 646 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 647 sizeof(jsys)); 648 if (error == ENOENT) 649 continue; 650 if (error != 0) 651 goto done_free; 652 switch (jsys) { 653 case JAIL_SYS_DISABLE: 654 if (!pr_flag_jailsys[fi].disable) { 655 error = EINVAL; 656 goto done_free; 657 } 658 pr_flags |= pr_flag_jailsys[fi].disable; 659 break; 660 case JAIL_SYS_NEW: 661 pr_flags |= pr_flag_jailsys[fi].new; 662 break; 663 case JAIL_SYS_INHERIT: 664 break; 665 default: 666 error = EINVAL; 667 goto done_free; 668 } 669 ch_flags |= 670 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 671 } 672 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 673 && !(pr_flags & PR_PERSIST)) { 674 error = EINVAL; 675 vfs_opterror(opts, "new jail must persist or attach"); 676 goto done_errmsg; 677 } 678 #ifdef VIMAGE 679 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 680 error = EINVAL; 681 vfs_opterror(opts, "vnet cannot be changed after creation"); 682 goto done_errmsg; 683 } 684 #endif 685 #ifdef INET 686 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 687 error = EINVAL; 688 vfs_opterror(opts, "ip4 cannot be changed after creation"); 689 goto done_errmsg; 690 } 691 #endif 692 #ifdef INET6 693 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 694 error = EINVAL; 695 vfs_opterror(opts, "ip6 cannot be changed after creation"); 696 goto done_errmsg; 697 } 698 #endif 699 700 pr_allow = ch_allow = 0; 701 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 702 fi++) { 703 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 704 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 705 } 706 ch_allow |= pr_allow; 707 708 error = vfs_getopt(opts, "name", (void **)&name, &len); 709 if (error == ENOENT) 710 name = NULL; 711 else if (error != 0) 712 goto done_free; 713 else { 714 if (len == 0 || name[len - 1] != '\0') { 715 error = EINVAL; 716 goto done_free; 717 } 718 if (len > MAXHOSTNAMELEN) { 719 error = ENAMETOOLONG; 720 goto done_free; 721 } 722 } 723 724 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 725 if (error == ENOENT) 726 host = NULL; 727 else if (error != 0) 728 goto done_free; 729 else { 730 ch_flags |= PR_HOST; 731 pr_flags |= PR_HOST; 732 if (len == 0 || host[len - 1] != '\0') { 733 error = EINVAL; 734 goto done_free; 735 } 736 if (len > MAXHOSTNAMELEN) { 737 error = ENAMETOOLONG; 738 goto done_free; 739 } 740 } 741 742 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 743 if (error == ENOENT) 744 domain = NULL; 745 else if (error != 0) 746 goto done_free; 747 else { 748 ch_flags |= PR_HOST; 749 pr_flags |= PR_HOST; 750 if (len == 0 || domain[len - 1] != '\0') { 751 error = EINVAL; 752 goto done_free; 753 } 754 if (len > MAXHOSTNAMELEN) { 755 error = ENAMETOOLONG; 756 goto done_free; 757 } 758 } 759 760 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 761 if (error == ENOENT) 762 uuid = NULL; 763 else if (error != 0) 764 goto done_free; 765 else { 766 ch_flags |= PR_HOST; 767 pr_flags |= PR_HOST; 768 if (len == 0 || uuid[len - 1] != '\0') { 769 error = EINVAL; 770 goto done_free; 771 } 772 if (len > HOSTUUIDLEN) { 773 error = ENAMETOOLONG; 774 goto done_free; 775 } 776 } 777 778 #ifdef COMPAT_FREEBSD32 779 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 780 uint32_t hid32; 781 782 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 783 hid = hid32; 784 } else 785 #endif 786 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 787 if (error == ENOENT) 788 gothid = 0; 789 else if (error != 0) 790 goto done_free; 791 else { 792 gothid = 1; 793 ch_flags |= PR_HOST; 794 pr_flags |= PR_HOST; 795 } 796 797 #ifdef INET 798 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 799 if (error == ENOENT) 800 ip4s = 0; 801 else if (error != 0) 802 goto done_free; 803 else if (ip4s & (sizeof(*ip4) - 1)) { 804 error = EINVAL; 805 goto done_free; 806 } else { 807 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE; 808 if (ip4s == 0) 809 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE; 810 else { 811 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER; 812 ip4s /= sizeof(*ip4); 813 if (ip4s > jail_max_af_ips) { 814 error = EINVAL; 815 vfs_opterror(opts, "too many IPv4 addresses"); 816 goto done_errmsg; 817 } 818 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 819 bcopy(op, ip4, ip4s * sizeof(*ip4)); 820 /* 821 * IP addresses are all sorted but ip[0] to preserve 822 * the primary IP address as given from userland. 823 * This special IP is used for unbound outgoing 824 * connections as well for "loopback" traffic in case 825 * source address selection cannot find any more fitting 826 * address to connect from. 827 */ 828 if (ip4s > 1) 829 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4); 830 /* 831 * Check for duplicate addresses and do some simple 832 * zero and broadcast checks. If users give other bogus 833 * addresses it is their problem. 834 * 835 * We do not have to care about byte order for these 836 * checks so we will do them in NBO. 837 */ 838 for (ii = 0; ii < ip4s; ii++) { 839 if (ip4[ii].s_addr == INADDR_ANY || 840 ip4[ii].s_addr == INADDR_BROADCAST) { 841 error = EINVAL; 842 goto done_free; 843 } 844 if ((ii+1) < ip4s && 845 (ip4[0].s_addr == ip4[ii+1].s_addr || 846 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 847 error = EINVAL; 848 goto done_free; 849 } 850 } 851 } 852 } 853 #endif 854 855 #ifdef INET6 856 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 857 if (error == ENOENT) 858 ip6s = 0; 859 else if (error != 0) 860 goto done_free; 861 else if (ip6s & (sizeof(*ip6) - 1)) { 862 error = EINVAL; 863 goto done_free; 864 } else { 865 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE; 866 if (ip6s == 0) 867 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE; 868 else { 869 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER; 870 ip6s /= sizeof(*ip6); 871 if (ip6s > jail_max_af_ips) { 872 error = EINVAL; 873 vfs_opterror(opts, "too many IPv6 addresses"); 874 goto done_errmsg; 875 } 876 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 877 bcopy(op, ip6, ip6s * sizeof(*ip6)); 878 if (ip6s > 1) 879 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6); 880 for (ii = 0; ii < ip6s; ii++) { 881 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 882 error = EINVAL; 883 goto done_free; 884 } 885 if ((ii+1) < ip6s && 886 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 887 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 888 { 889 error = EINVAL; 890 goto done_free; 891 } 892 } 893 } 894 } 895 #endif 896 897 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 898 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 899 error = EINVAL; 900 vfs_opterror(opts, 901 "vnet jails cannot have IP address restrictions"); 902 goto done_errmsg; 903 } 904 #endif 905 906 fullpath_disabled = 0; 907 root = NULL; 908 error = vfs_getopt(opts, "path", (void **)&path, &len); 909 if (error == ENOENT) 910 path = NULL; 911 else if (error != 0) 912 goto done_free; 913 else { 914 if (flags & JAIL_UPDATE) { 915 error = EINVAL; 916 vfs_opterror(opts, 917 "path cannot be changed after creation"); 918 goto done_errmsg; 919 } 920 if (len == 0 || path[len - 1] != '\0') { 921 error = EINVAL; 922 goto done_free; 923 } 924 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE, UIO_SYSSPACE, 925 path, td); 926 error = namei(&nd); 927 if (error) 928 goto done_free; 929 vfslocked = NDHASGIANT(&nd); 930 root = nd.ni_vp; 931 NDFREE(&nd, NDF_ONLY_PNBUF); 932 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 933 strlcpy(g_path, path, MAXPATHLEN); 934 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 935 if (error == 0) 936 path = g_path; 937 else if (error == ENODEV) { 938 /* proceed if sysctl debug.disablefullpath == 1 */ 939 fullpath_disabled = 1; 940 if (len < 2 || (len == 2 && path[0] == '/')) 941 path = NULL; 942 } else { 943 /* exit on other errors */ 944 VFS_UNLOCK_GIANT(vfslocked); 945 goto done_free; 946 } 947 if (root->v_type != VDIR) { 948 error = ENOTDIR; 949 vput(root); 950 VFS_UNLOCK_GIANT(vfslocked); 951 goto done_free; 952 } 953 VOP_UNLOCK(root, 0); 954 VFS_UNLOCK_GIANT(vfslocked); 955 if (fullpath_disabled) { 956 /* Leave room for a real-root full pathname. */ 957 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 958 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 959 error = ENAMETOOLONG; 960 goto done_free; 961 } 962 } 963 } 964 965 /* 966 * Grab the allprison lock before letting modules check their 967 * parameters. Once we have it, do not let go so we'll have a 968 * consistent view of the OSD list. 969 */ 970 sx_xlock(&allprison_lock); 971 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts); 972 if (error) 973 goto done_unlock_list; 974 975 /* By now, all parameters should have been noted. */ 976 TAILQ_FOREACH(opt, opts, link) { 977 if (!opt->seen && strcmp(opt->name, "errmsg")) { 978 error = EINVAL; 979 vfs_opterror(opts, "unknown parameter: %s", opt->name); 980 goto done_unlock_list; 981 } 982 } 983 984 /* 985 * See if we are creating a new record or updating an existing one. 986 * This abuses the file error codes ENOENT and EEXIST. 987 */ 988 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 989 if (!cuflags) { 990 error = EINVAL; 991 vfs_opterror(opts, "no valid operation (create or update)"); 992 goto done_unlock_list; 993 } 994 pr = NULL; 995 namelc = NULL; 996 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 997 namelc = strrchr(name, '.'); 998 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 999 if (*p != '\0') 1000 jid = 0; 1001 } 1002 if (jid != 0) { 1003 /* 1004 * See if a requested jid already exists. There is an 1005 * information leak here if the jid exists but is not within 1006 * the caller's jail hierarchy. Jail creators will get EEXIST 1007 * even though they cannot see the jail, and CREATE | UPDATE 1008 * will return ENOENT which is not normally a valid error. 1009 */ 1010 if (jid < 0) { 1011 error = EINVAL; 1012 vfs_opterror(opts, "negative jid"); 1013 goto done_unlock_list; 1014 } 1015 pr = prison_find(jid); 1016 if (pr != NULL) { 1017 ppr = pr->pr_parent; 1018 /* Create: jid must not exist. */ 1019 if (cuflags == JAIL_CREATE) { 1020 mtx_unlock(&pr->pr_mtx); 1021 error = EEXIST; 1022 vfs_opterror(opts, "jail %d already exists", 1023 jid); 1024 goto done_unlock_list; 1025 } 1026 if (!prison_ischild(mypr, pr)) { 1027 mtx_unlock(&pr->pr_mtx); 1028 pr = NULL; 1029 } else if (pr->pr_uref == 0) { 1030 if (!(flags & JAIL_DYING)) { 1031 mtx_unlock(&pr->pr_mtx); 1032 error = ENOENT; 1033 vfs_opterror(opts, "jail %d is dying", 1034 jid); 1035 goto done_unlock_list; 1036 } else if ((flags & JAIL_ATTACH) || 1037 (pr_flags & PR_PERSIST)) { 1038 /* 1039 * A dying jail might be resurrected 1040 * (via attach or persist), but first 1041 * it must determine if another jail 1042 * has claimed its name. Accomplish 1043 * this by implicitly re-setting the 1044 * name. 1045 */ 1046 if (name == NULL) 1047 name = prison_name(mypr, pr); 1048 } 1049 } 1050 } 1051 if (pr == NULL) { 1052 /* Update: jid must exist. */ 1053 if (cuflags == JAIL_UPDATE) { 1054 error = ENOENT; 1055 vfs_opterror(opts, "jail %d not found", jid); 1056 goto done_unlock_list; 1057 } 1058 } 1059 } 1060 /* 1061 * If the caller provided a name, look for a jail by that name. 1062 * This has different semantics for creates and updates keyed by jid 1063 * (where the name must not already exist in a different jail), 1064 * and updates keyed by the name itself (where the name must exist 1065 * because that is the jail being updated). 1066 */ 1067 if (name != NULL) { 1068 namelc = strrchr(name, '.'); 1069 if (namelc == NULL) 1070 namelc = name; 1071 else { 1072 /* 1073 * This is a hierarchical name. Split it into the 1074 * parent and child names, and make sure the parent 1075 * exists or matches an already found jail. 1076 */ 1077 *namelc = '\0'; 1078 if (pr != NULL) { 1079 if (strncmp(name, ppr->pr_name, namelc - name) 1080 || ppr->pr_name[namelc - name] != '\0') { 1081 mtx_unlock(&pr->pr_mtx); 1082 error = EINVAL; 1083 vfs_opterror(opts, 1084 "cannot change jail's parent"); 1085 goto done_unlock_list; 1086 } 1087 } else { 1088 ppr = prison_find_name(mypr, name); 1089 if (ppr == NULL) { 1090 error = ENOENT; 1091 vfs_opterror(opts, 1092 "jail \"%s\" not found", name); 1093 goto done_unlock_list; 1094 } 1095 mtx_unlock(&ppr->pr_mtx); 1096 } 1097 name = ++namelc; 1098 } 1099 if (name[0] != '\0') { 1100 namelen = 1101 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1102 name_again: 1103 deadpr = NULL; 1104 FOREACH_PRISON_CHILD(ppr, tpr) { 1105 if (tpr != pr && tpr->pr_ref > 0 && 1106 !strcmp(tpr->pr_name + namelen, name)) { 1107 if (pr == NULL && 1108 cuflags != JAIL_CREATE) { 1109 mtx_lock(&tpr->pr_mtx); 1110 if (tpr->pr_ref > 0) { 1111 /* 1112 * Use this jail 1113 * for updates. 1114 */ 1115 if (tpr->pr_uref > 0) { 1116 pr = tpr; 1117 break; 1118 } 1119 deadpr = tpr; 1120 } 1121 mtx_unlock(&tpr->pr_mtx); 1122 } else if (tpr->pr_uref > 0) { 1123 /* 1124 * Create, or update(jid): 1125 * name must not exist in an 1126 * active sibling jail. 1127 */ 1128 error = EEXIST; 1129 if (pr != NULL) 1130 mtx_unlock(&pr->pr_mtx); 1131 vfs_opterror(opts, 1132 "jail \"%s\" already exists", 1133 name); 1134 goto done_unlock_list; 1135 } 1136 } 1137 } 1138 /* If no active jail is found, use a dying one. */ 1139 if (deadpr != NULL && pr == NULL) { 1140 if (flags & JAIL_DYING) { 1141 mtx_lock(&deadpr->pr_mtx); 1142 if (deadpr->pr_ref == 0) { 1143 mtx_unlock(&deadpr->pr_mtx); 1144 goto name_again; 1145 } 1146 pr = deadpr; 1147 } else if (cuflags == JAIL_UPDATE) { 1148 error = ENOENT; 1149 vfs_opterror(opts, 1150 "jail \"%s\" is dying", name); 1151 goto done_unlock_list; 1152 } 1153 } 1154 /* Update: name must exist if no jid. */ 1155 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1156 error = ENOENT; 1157 vfs_opterror(opts, "jail \"%s\" not found", 1158 name); 1159 goto done_unlock_list; 1160 } 1161 } 1162 } 1163 /* Update: must provide a jid or name. */ 1164 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1165 error = ENOENT; 1166 vfs_opterror(opts, "update specified no jail"); 1167 goto done_unlock_list; 1168 } 1169 1170 /* If there's no prison to update, create a new one and link it in. */ 1171 if (pr == NULL) { 1172 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1173 if (tpr->pr_childcount >= tpr->pr_childmax) { 1174 error = EPERM; 1175 vfs_opterror(opts, "prison limit exceeded"); 1176 goto done_unlock_list; 1177 } 1178 created = 1; 1179 mtx_lock(&ppr->pr_mtx); 1180 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) { 1181 mtx_unlock(&ppr->pr_mtx); 1182 error = ENOENT; 1183 vfs_opterror(opts, "parent jail went away!"); 1184 goto done_unlock_list; 1185 } 1186 ppr->pr_ref++; 1187 ppr->pr_uref++; 1188 mtx_unlock(&ppr->pr_mtx); 1189 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1190 if (jid == 0) { 1191 /* Find the next free jid. */ 1192 jid = lastprid + 1; 1193 findnext: 1194 if (jid == JAIL_MAX) 1195 jid = 1; 1196 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1197 if (tpr->pr_id < jid) 1198 continue; 1199 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1200 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1201 break; 1202 } 1203 if (jid == lastprid) { 1204 error = EAGAIN; 1205 vfs_opterror(opts, 1206 "no available jail IDs"); 1207 free(pr, M_PRISON); 1208 prison_deref(ppr, PD_DEREF | 1209 PD_DEUREF | PD_LIST_XLOCKED); 1210 goto done_releroot; 1211 } 1212 jid++; 1213 goto findnext; 1214 } 1215 lastprid = jid; 1216 } else { 1217 /* 1218 * The jail already has a jid (that did not yet exist), 1219 * so just find where to insert it. 1220 */ 1221 TAILQ_FOREACH(tpr, &allprison, pr_list) 1222 if (tpr->pr_id >= jid) { 1223 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1224 break; 1225 } 1226 } 1227 if (tpr == NULL) 1228 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1229 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1230 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1231 tpr->pr_childcount++; 1232 1233 pr->pr_parent = ppr; 1234 pr->pr_id = jid; 1235 1236 /* Set some default values, and inherit some from the parent. */ 1237 if (name == NULL) 1238 name = ""; 1239 if (path == NULL) { 1240 path = "/"; 1241 root = mypr->pr_root; 1242 vref(root); 1243 } 1244 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1245 pr->pr_flags |= PR_HOST; 1246 #if defined(INET) || defined(INET6) 1247 #ifdef VIMAGE 1248 if (!(pr_flags & PR_VNET)) 1249 #endif 1250 { 1251 #ifdef INET 1252 if (!(ch_flags & PR_IP4_USER)) 1253 pr->pr_flags |= 1254 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE; 1255 else if (!(pr_flags & PR_IP4_USER)) { 1256 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1257 if (ppr->pr_ip4 != NULL) { 1258 pr->pr_ip4s = ppr->pr_ip4s; 1259 pr->pr_ip4 = malloc(pr->pr_ip4s * 1260 sizeof(struct in_addr), M_PRISON, 1261 M_WAITOK); 1262 bcopy(ppr->pr_ip4, pr->pr_ip4, 1263 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1264 } 1265 } 1266 #endif 1267 #ifdef INET6 1268 if (!(ch_flags & PR_IP6_USER)) 1269 pr->pr_flags |= 1270 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE; 1271 else if (!(pr_flags & PR_IP6_USER)) { 1272 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1273 if (ppr->pr_ip6 != NULL) { 1274 pr->pr_ip6s = ppr->pr_ip6s; 1275 pr->pr_ip6 = malloc(pr->pr_ip6s * 1276 sizeof(struct in6_addr), M_PRISON, 1277 M_WAITOK); 1278 bcopy(ppr->pr_ip6, pr->pr_ip6, 1279 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1280 } 1281 } 1282 #endif 1283 } 1284 #endif 1285 /* Source address selection is always on by default. */ 1286 pr->pr_flags |= _PR_IP_SADDRSEL; 1287 1288 pr->pr_securelevel = ppr->pr_securelevel; 1289 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1290 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 1291 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1292 1293 LIST_INIT(&pr->pr_children); 1294 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1295 1296 #ifdef VIMAGE 1297 /* Allocate a new vnet if specified. */ 1298 pr->pr_vnet = (pr_flags & PR_VNET) 1299 ? vnet_alloc() : ppr->pr_vnet; 1300 #endif 1301 /* 1302 * Allocate a dedicated cpuset for each jail. 1303 * Unlike other initial settings, this may return an erorr. 1304 */ 1305 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1306 if (error) { 1307 prison_deref(pr, PD_LIST_XLOCKED); 1308 goto done_releroot; 1309 } 1310 1311 mtx_lock(&pr->pr_mtx); 1312 /* 1313 * New prisons do not yet have a reference, because we do not 1314 * want other to see the incomplete prison once the 1315 * allprison_lock is downgraded. 1316 */ 1317 } else { 1318 created = 0; 1319 /* 1320 * Grab a reference for existing prisons, to ensure they 1321 * continue to exist for the duration of the call. 1322 */ 1323 pr->pr_ref++; 1324 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1325 if ((pr->pr_flags & PR_VNET) && 1326 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1327 error = EINVAL; 1328 vfs_opterror(opts, 1329 "vnet jails cannot have IP address restrictions"); 1330 goto done_deref_locked; 1331 } 1332 #endif 1333 #ifdef INET 1334 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1335 error = EINVAL; 1336 vfs_opterror(opts, 1337 "ip4 cannot be changed after creation"); 1338 goto done_deref_locked; 1339 } 1340 #endif 1341 #ifdef INET6 1342 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1343 error = EINVAL; 1344 vfs_opterror(opts, 1345 "ip6 cannot be changed after creation"); 1346 goto done_deref_locked; 1347 } 1348 #endif 1349 } 1350 1351 /* Do final error checking before setting anything. */ 1352 if (gotslevel) { 1353 if (slevel < ppr->pr_securelevel) { 1354 error = EPERM; 1355 goto done_deref_locked; 1356 } 1357 } 1358 if (gotchildmax) { 1359 if (childmax >= ppr->pr_childmax) { 1360 error = EPERM; 1361 goto done_deref_locked; 1362 } 1363 } 1364 if (gotenforce) { 1365 if (enforce < ppr->pr_enforce_statfs) { 1366 error = EPERM; 1367 goto done_deref_locked; 1368 } 1369 } 1370 if (gotrsnum) { 1371 /* 1372 * devfs_rsnum is a uint16_t 1373 */ 1374 if (rsnum < 0 || rsnum > 65535) { 1375 error = EINVAL; 1376 goto done_deref_locked; 1377 } 1378 /* 1379 * Nested jails always inherit parent's devfs ruleset 1380 */ 1381 if (jailed(td->td_ucred)) { 1382 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1383 error = EPERM; 1384 goto done_deref_locked; 1385 } else 1386 rsnum = ppr->pr_devfs_rsnum; 1387 } 1388 } 1389 #ifdef INET 1390 if (ip4s > 0) { 1391 if (ppr->pr_flags & PR_IP4) { 1392 /* 1393 * Make sure the new set of IP addresses is a 1394 * subset of the parent's list. Don't worry 1395 * about the parent being unlocked, as any 1396 * setting is done with allprison_lock held. 1397 */ 1398 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1399 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1400 break; 1401 if (ij == ppr->pr_ip4s) { 1402 error = EPERM; 1403 goto done_deref_locked; 1404 } 1405 if (ip4s > 1) { 1406 for (ii = ij = 1; ii < ip4s; ii++) { 1407 if (ip4[ii].s_addr == 1408 ppr->pr_ip4[0].s_addr) 1409 continue; 1410 for (; ij < ppr->pr_ip4s; ij++) 1411 if (ip4[ii].s_addr == 1412 ppr->pr_ip4[ij].s_addr) 1413 break; 1414 if (ij == ppr->pr_ip4s) 1415 break; 1416 } 1417 if (ij == ppr->pr_ip4s) { 1418 error = EPERM; 1419 goto done_deref_locked; 1420 } 1421 } 1422 } 1423 /* 1424 * Check for conflicting IP addresses. We permit them 1425 * if there is no more than one IP on each jail. If 1426 * there is a duplicate on a jail with more than one 1427 * IP stop checking and return error. 1428 */ 1429 tppr = ppr; 1430 #ifdef VIMAGE 1431 for (; tppr != &prison0; tppr = tppr->pr_parent) 1432 if (tppr->pr_flags & PR_VNET) 1433 break; 1434 #endif 1435 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1436 if (tpr == pr || 1437 #ifdef VIMAGE 1438 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1439 #endif 1440 tpr->pr_uref == 0) { 1441 descend = 0; 1442 continue; 1443 } 1444 if (!(tpr->pr_flags & PR_IP4_USER)) 1445 continue; 1446 descend = 0; 1447 if (tpr->pr_ip4 == NULL || 1448 (ip4s == 1 && tpr->pr_ip4s == 1)) 1449 continue; 1450 for (ii = 0; ii < ip4s; ii++) { 1451 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1452 error = EADDRINUSE; 1453 vfs_opterror(opts, 1454 "IPv4 addresses clash"); 1455 goto done_deref_locked; 1456 } 1457 } 1458 } 1459 } 1460 #endif 1461 #ifdef INET6 1462 if (ip6s > 0) { 1463 if (ppr->pr_flags & PR_IP6) { 1464 /* 1465 * Make sure the new set of IP addresses is a 1466 * subset of the parent's list. 1467 */ 1468 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1469 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1470 &ppr->pr_ip6[ij])) 1471 break; 1472 if (ij == ppr->pr_ip6s) { 1473 error = EPERM; 1474 goto done_deref_locked; 1475 } 1476 if (ip6s > 1) { 1477 for (ii = ij = 1; ii < ip6s; ii++) { 1478 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1479 &ppr->pr_ip6[0])) 1480 continue; 1481 for (; ij < ppr->pr_ip6s; ij++) 1482 if (IN6_ARE_ADDR_EQUAL( 1483 &ip6[ii], &ppr->pr_ip6[ij])) 1484 break; 1485 if (ij == ppr->pr_ip6s) 1486 break; 1487 } 1488 if (ij == ppr->pr_ip6s) { 1489 error = EPERM; 1490 goto done_deref_locked; 1491 } 1492 } 1493 } 1494 /* Check for conflicting IP addresses. */ 1495 tppr = ppr; 1496 #ifdef VIMAGE 1497 for (; tppr != &prison0; tppr = tppr->pr_parent) 1498 if (tppr->pr_flags & PR_VNET) 1499 break; 1500 #endif 1501 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1502 if (tpr == pr || 1503 #ifdef VIMAGE 1504 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1505 #endif 1506 tpr->pr_uref == 0) { 1507 descend = 0; 1508 continue; 1509 } 1510 if (!(tpr->pr_flags & PR_IP6_USER)) 1511 continue; 1512 descend = 0; 1513 if (tpr->pr_ip6 == NULL || 1514 (ip6s == 1 && tpr->pr_ip6s == 1)) 1515 continue; 1516 for (ii = 0; ii < ip6s; ii++) { 1517 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1518 error = EADDRINUSE; 1519 vfs_opterror(opts, 1520 "IPv6 addresses clash"); 1521 goto done_deref_locked; 1522 } 1523 } 1524 } 1525 } 1526 #endif 1527 onamelen = namelen = 0; 1528 if (name != NULL) { 1529 /* Give a default name of the jid. Also allow the name to be 1530 * explicitly the jid - but not any other number, and only in 1531 * normal form (no leading zero/etc). 1532 */ 1533 if (name[0] == '\0') 1534 snprintf(name = numbuf, sizeof(numbuf), "%d", jid); 1535 else if ((strtoul(namelc, &p, 10) != jid || 1536 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1537 error = EINVAL; 1538 vfs_opterror(opts, 1539 "name cannot be numeric (unless it is the jid)"); 1540 goto done_deref_locked; 1541 } 1542 /* 1543 * Make sure the name isn't too long for the prison or its 1544 * children. 1545 */ 1546 onamelen = strlen(pr->pr_name); 1547 namelen = strlen(name); 1548 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) { 1549 error = ENAMETOOLONG; 1550 goto done_deref_locked; 1551 } 1552 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1553 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1554 sizeof(pr->pr_name)) { 1555 error = ENAMETOOLONG; 1556 goto done_deref_locked; 1557 } 1558 } 1559 } 1560 if (pr_allow & ~ppr->pr_allow) { 1561 error = EPERM; 1562 goto done_deref_locked; 1563 } 1564 1565 /* Set the parameters of the prison. */ 1566 #ifdef INET 1567 redo_ip4 = 0; 1568 if (pr_flags & PR_IP4_USER) { 1569 pr->pr_flags |= PR_IP4; 1570 free(pr->pr_ip4, M_PRISON); 1571 pr->pr_ip4s = ip4s; 1572 pr->pr_ip4 = ip4; 1573 ip4 = NULL; 1574 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1575 #ifdef VIMAGE 1576 if (tpr->pr_flags & PR_VNET) { 1577 descend = 0; 1578 continue; 1579 } 1580 #endif 1581 if (prison_restrict_ip4(tpr, NULL)) { 1582 redo_ip4 = 1; 1583 descend = 0; 1584 } 1585 } 1586 } 1587 #endif 1588 #ifdef INET6 1589 redo_ip6 = 0; 1590 if (pr_flags & PR_IP6_USER) { 1591 pr->pr_flags |= PR_IP6; 1592 free(pr->pr_ip6, M_PRISON); 1593 pr->pr_ip6s = ip6s; 1594 pr->pr_ip6 = ip6; 1595 ip6 = NULL; 1596 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1597 #ifdef VIMAGE 1598 if (tpr->pr_flags & PR_VNET) { 1599 descend = 0; 1600 continue; 1601 } 1602 #endif 1603 if (prison_restrict_ip6(tpr, NULL)) { 1604 redo_ip6 = 1; 1605 descend = 0; 1606 } 1607 } 1608 } 1609 #endif 1610 if (gotslevel) { 1611 pr->pr_securelevel = slevel; 1612 /* Set all child jails to be at least this level. */ 1613 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1614 if (tpr->pr_securelevel < slevel) 1615 tpr->pr_securelevel = slevel; 1616 } 1617 if (gotchildmax) { 1618 pr->pr_childmax = childmax; 1619 /* Set all child jails to under this limit. */ 1620 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1621 if (tpr->pr_childmax > childmax - level) 1622 tpr->pr_childmax = childmax > level 1623 ? childmax - level : 0; 1624 } 1625 if (gotenforce) { 1626 pr->pr_enforce_statfs = enforce; 1627 /* Pass this restriction on to the children. */ 1628 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1629 if (tpr->pr_enforce_statfs < enforce) 1630 tpr->pr_enforce_statfs = enforce; 1631 } 1632 if (gotrsnum) { 1633 pr->pr_devfs_rsnum = rsnum; 1634 /* Pass this restriction on to the children. */ 1635 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1636 tpr->pr_devfs_rsnum = rsnum; 1637 } 1638 if (name != NULL) { 1639 if (ppr == &prison0) 1640 strlcpy(pr->pr_name, name, sizeof(pr->pr_name)); 1641 else 1642 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1643 ppr->pr_name, name); 1644 /* Change this component of child names. */ 1645 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1646 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1647 strlen(tpr->pr_name + onamelen) + 1); 1648 bcopy(pr->pr_name, tpr->pr_name, namelen); 1649 } 1650 } 1651 if (path != NULL) { 1652 /* Try to keep a real-rooted full pathname. */ 1653 if (fullpath_disabled && path[0] == '/' && 1654 strcmp(mypr->pr_path, "/")) 1655 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1656 mypr->pr_path, path); 1657 else 1658 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1659 pr->pr_root = root; 1660 } 1661 if (PR_HOST & ch_flags & ~pr_flags) { 1662 if (pr->pr_flags & PR_HOST) { 1663 /* 1664 * Copy the parent's host info. As with pr_ip4 above, 1665 * the lack of a lock on the parent is not a problem; 1666 * it is always set with allprison_lock at least 1667 * shared, and is held exclusively here. 1668 */ 1669 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1670 sizeof(pr->pr_hostname)); 1671 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1672 sizeof(pr->pr_domainname)); 1673 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1674 sizeof(pr->pr_hostuuid)); 1675 pr->pr_hostid = pr->pr_parent->pr_hostid; 1676 } 1677 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1678 /* Set this prison, and any descendants without PR_HOST. */ 1679 if (host != NULL) 1680 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1681 if (domain != NULL) 1682 strlcpy(pr->pr_domainname, domain, 1683 sizeof(pr->pr_domainname)); 1684 if (uuid != NULL) 1685 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1686 if (gothid) 1687 pr->pr_hostid = hid; 1688 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1689 if (tpr->pr_flags & PR_HOST) 1690 descend = 0; 1691 else { 1692 if (host != NULL) 1693 strlcpy(tpr->pr_hostname, 1694 pr->pr_hostname, 1695 sizeof(tpr->pr_hostname)); 1696 if (domain != NULL) 1697 strlcpy(tpr->pr_domainname, 1698 pr->pr_domainname, 1699 sizeof(tpr->pr_domainname)); 1700 if (uuid != NULL) 1701 strlcpy(tpr->pr_hostuuid, 1702 pr->pr_hostuuid, 1703 sizeof(tpr->pr_hostuuid)); 1704 if (gothid) 1705 tpr->pr_hostid = hid; 1706 } 1707 } 1708 } 1709 if ((tallow = ch_allow & ~pr_allow)) { 1710 /* Clear allow bits in all children. */ 1711 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1712 tpr->pr_allow &= ~tallow; 1713 } 1714 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1715 /* 1716 * Persistent prisons get an extra reference, and prisons losing their 1717 * persist flag lose that reference. Only do this for existing prisons 1718 * for now, so new ones will remain unseen until after the module 1719 * handlers have completed. 1720 */ 1721 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1722 if (pr_flags & PR_PERSIST) { 1723 pr->pr_ref++; 1724 pr->pr_uref++; 1725 } else { 1726 pr->pr_ref--; 1727 pr->pr_uref--; 1728 } 1729 } 1730 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1731 mtx_unlock(&pr->pr_mtx); 1732 1733 #ifdef RACCT 1734 if (created) 1735 prison_racct_attach(pr); 1736 #endif 1737 1738 /* Locks may have prevented a complete restriction of child IP 1739 * addresses. If so, allocate some more memory and try again. 1740 */ 1741 #ifdef INET 1742 while (redo_ip4) { 1743 ip4s = pr->pr_ip4s; 1744 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1745 mtx_lock(&pr->pr_mtx); 1746 redo_ip4 = 0; 1747 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1748 #ifdef VIMAGE 1749 if (tpr->pr_flags & PR_VNET) { 1750 descend = 0; 1751 continue; 1752 } 1753 #endif 1754 if (prison_restrict_ip4(tpr, ip4)) { 1755 if (ip4 != NULL) 1756 ip4 = NULL; 1757 else 1758 redo_ip4 = 1; 1759 } 1760 } 1761 mtx_unlock(&pr->pr_mtx); 1762 } 1763 #endif 1764 #ifdef INET6 1765 while (redo_ip6) { 1766 ip6s = pr->pr_ip6s; 1767 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1768 mtx_lock(&pr->pr_mtx); 1769 redo_ip6 = 0; 1770 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1771 #ifdef VIMAGE 1772 if (tpr->pr_flags & PR_VNET) { 1773 descend = 0; 1774 continue; 1775 } 1776 #endif 1777 if (prison_restrict_ip6(tpr, ip6)) { 1778 if (ip6 != NULL) 1779 ip6 = NULL; 1780 else 1781 redo_ip6 = 1; 1782 } 1783 } 1784 mtx_unlock(&pr->pr_mtx); 1785 } 1786 #endif 1787 1788 /* Let the modules do their work. */ 1789 sx_downgrade(&allprison_lock); 1790 if (created) { 1791 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1792 if (error) { 1793 prison_deref(pr, PD_LIST_SLOCKED); 1794 goto done_errmsg; 1795 } 1796 } 1797 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1798 if (error) { 1799 prison_deref(pr, created 1800 ? PD_LIST_SLOCKED 1801 : PD_DEREF | PD_LIST_SLOCKED); 1802 goto done_errmsg; 1803 } 1804 1805 /* Attach this process to the prison if requested. */ 1806 if (flags & JAIL_ATTACH) { 1807 mtx_lock(&pr->pr_mtx); 1808 error = do_jail_attach(td, pr); 1809 if (error) { 1810 vfs_opterror(opts, "attach failed"); 1811 if (!created) 1812 prison_deref(pr, PD_DEREF); 1813 goto done_errmsg; 1814 } 1815 } 1816 1817 #ifdef RACCT 1818 if (!created) { 1819 sx_sunlock(&allprison_lock); 1820 prison_racct_modify(pr); 1821 sx_slock(&allprison_lock); 1822 } 1823 #endif 1824 1825 td->td_retval[0] = pr->pr_id; 1826 1827 /* 1828 * Now that it is all there, drop the temporary reference from existing 1829 * prisons. Or add a reference to newly created persistent prisons 1830 * (which was not done earlier so that the prison would not be publicly 1831 * visible). 1832 */ 1833 if (!created) { 1834 prison_deref(pr, (flags & JAIL_ATTACH) 1835 ? PD_DEREF 1836 : PD_DEREF | PD_LIST_SLOCKED); 1837 } else { 1838 if (pr_flags & PR_PERSIST) { 1839 mtx_lock(&pr->pr_mtx); 1840 pr->pr_ref++; 1841 pr->pr_uref++; 1842 mtx_unlock(&pr->pr_mtx); 1843 } 1844 if (!(flags & JAIL_ATTACH)) 1845 sx_sunlock(&allprison_lock); 1846 } 1847 1848 goto done_errmsg; 1849 1850 done_deref_locked: 1851 prison_deref(pr, created 1852 ? PD_LOCKED | PD_LIST_XLOCKED 1853 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1854 goto done_releroot; 1855 done_unlock_list: 1856 sx_xunlock(&allprison_lock); 1857 done_releroot: 1858 if (root != NULL) { 1859 vfslocked = VFS_LOCK_GIANT(root->v_mount); 1860 vrele(root); 1861 VFS_UNLOCK_GIANT(vfslocked); 1862 } 1863 done_errmsg: 1864 if (error) { 1865 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1866 if (errmsg_len > 0) { 1867 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1868 if (errmsg_pos > 0) { 1869 if (optuio->uio_segflg == UIO_SYSSPACE) 1870 bcopy(errmsg, 1871 optuio->uio_iov[errmsg_pos].iov_base, 1872 errmsg_len); 1873 else 1874 copyout(errmsg, 1875 optuio->uio_iov[errmsg_pos].iov_base, 1876 errmsg_len); 1877 } 1878 } 1879 } 1880 done_free: 1881 #ifdef INET 1882 free(ip4, M_PRISON); 1883 #endif 1884 #ifdef INET6 1885 free(ip6, M_PRISON); 1886 #endif 1887 if (g_path != NULL) 1888 free(g_path, M_TEMP); 1889 vfs_freeopts(opts); 1890 return (error); 1891 } 1892 1893 1894 /* 1895 * struct jail_get_args { 1896 * struct iovec *iovp; 1897 * unsigned int iovcnt; 1898 * int flags; 1899 * }; 1900 */ 1901 int 1902 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1903 { 1904 struct uio *auio; 1905 int error; 1906 1907 /* Check that we have an even number of iovecs. */ 1908 if (uap->iovcnt & 1) 1909 return (EINVAL); 1910 1911 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1912 if (error) 1913 return (error); 1914 error = kern_jail_get(td, auio, uap->flags); 1915 if (error == 0) 1916 error = copyout(auio->uio_iov, uap->iovp, 1917 uap->iovcnt * sizeof (struct iovec)); 1918 free(auio, M_IOV); 1919 return (error); 1920 } 1921 1922 int 1923 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1924 { 1925 struct prison *pr, *mypr; 1926 struct vfsopt *opt; 1927 struct vfsoptlist *opts; 1928 char *errmsg, *name; 1929 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1930 1931 if (flags & ~JAIL_GET_MASK) 1932 return (EINVAL); 1933 1934 /* Get the parameter list. */ 1935 error = vfs_buildopts(optuio, &opts); 1936 if (error) 1937 return (error); 1938 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1939 mypr = td->td_ucred->cr_prison; 1940 1941 /* 1942 * Find the prison specified by one of: lastjid, jid, name. 1943 */ 1944 sx_slock(&allprison_lock); 1945 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1946 if (error == 0) { 1947 TAILQ_FOREACH(pr, &allprison, pr_list) { 1948 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1949 mtx_lock(&pr->pr_mtx); 1950 if (pr->pr_ref > 0 && 1951 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1952 break; 1953 mtx_unlock(&pr->pr_mtx); 1954 } 1955 } 1956 if (pr != NULL) 1957 goto found_prison; 1958 error = ENOENT; 1959 vfs_opterror(opts, "no jail after %d", jid); 1960 goto done_unlock_list; 1961 } else if (error != ENOENT) 1962 goto done_unlock_list; 1963 1964 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1965 if (error == 0) { 1966 if (jid != 0) { 1967 pr = prison_find_child(mypr, jid); 1968 if (pr != NULL) { 1969 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1970 mtx_unlock(&pr->pr_mtx); 1971 error = ENOENT; 1972 vfs_opterror(opts, "jail %d is dying", 1973 jid); 1974 goto done_unlock_list; 1975 } 1976 goto found_prison; 1977 } 1978 error = ENOENT; 1979 vfs_opterror(opts, "jail %d not found", jid); 1980 goto done_unlock_list; 1981 } 1982 } else if (error != ENOENT) 1983 goto done_unlock_list; 1984 1985 error = vfs_getopt(opts, "name", (void **)&name, &len); 1986 if (error == 0) { 1987 if (len == 0 || name[len - 1] != '\0') { 1988 error = EINVAL; 1989 goto done_unlock_list; 1990 } 1991 pr = prison_find_name(mypr, name); 1992 if (pr != NULL) { 1993 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1994 mtx_unlock(&pr->pr_mtx); 1995 error = ENOENT; 1996 vfs_opterror(opts, "jail \"%s\" is dying", 1997 name); 1998 goto done_unlock_list; 1999 } 2000 goto found_prison; 2001 } 2002 error = ENOENT; 2003 vfs_opterror(opts, "jail \"%s\" not found", name); 2004 goto done_unlock_list; 2005 } else if (error != ENOENT) 2006 goto done_unlock_list; 2007 2008 vfs_opterror(opts, "no jail specified"); 2009 error = ENOENT; 2010 goto done_unlock_list; 2011 2012 found_prison: 2013 /* Get the parameters of the prison. */ 2014 pr->pr_ref++; 2015 locked = PD_LOCKED; 2016 td->td_retval[0] = pr->pr_id; 2017 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2018 if (error != 0 && error != ENOENT) 2019 goto done_deref; 2020 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2021 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2022 if (error != 0 && error != ENOENT) 2023 goto done_deref; 2024 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2025 if (error != 0 && error != ENOENT) 2026 goto done_deref; 2027 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2028 sizeof(pr->pr_cpuset->cs_id)); 2029 if (error != 0 && error != ENOENT) 2030 goto done_deref; 2031 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2032 if (error != 0 && error != ENOENT) 2033 goto done_deref; 2034 #ifdef INET 2035 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2036 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2037 if (error != 0 && error != ENOENT) 2038 goto done_deref; 2039 #endif 2040 #ifdef INET6 2041 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2042 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2043 if (error != 0 && error != ENOENT) 2044 goto done_deref; 2045 #endif 2046 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2047 sizeof(pr->pr_securelevel)); 2048 if (error != 0 && error != ENOENT) 2049 goto done_deref; 2050 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2051 sizeof(pr->pr_childcount)); 2052 if (error != 0 && error != ENOENT) 2053 goto done_deref; 2054 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2055 sizeof(pr->pr_childmax)); 2056 if (error != 0 && error != ENOENT) 2057 goto done_deref; 2058 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2059 if (error != 0 && error != ENOENT) 2060 goto done_deref; 2061 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2062 if (error != 0 && error != ENOENT) 2063 goto done_deref; 2064 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2065 if (error != 0 && error != ENOENT) 2066 goto done_deref; 2067 #ifdef COMPAT_FREEBSD32 2068 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2069 uint32_t hid32 = pr->pr_hostid; 2070 2071 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2072 } else 2073 #endif 2074 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2075 sizeof(pr->pr_hostid)); 2076 if (error != 0 && error != ENOENT) 2077 goto done_deref; 2078 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2079 sizeof(pr->pr_enforce_statfs)); 2080 if (error != 0 && error != ENOENT) 2081 goto done_deref; 2082 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2083 sizeof(pr->pr_devfs_rsnum)); 2084 if (error != 0 && error != ENOENT) 2085 goto done_deref; 2086 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 2087 fi++) { 2088 if (pr_flag_names[fi] == NULL) 2089 continue; 2090 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2091 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2092 if (error != 0 && error != ENOENT) 2093 goto done_deref; 2094 i = !i; 2095 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2096 if (error != 0 && error != ENOENT) 2097 goto done_deref; 2098 } 2099 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 2100 fi++) { 2101 i = pr->pr_flags & 2102 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2103 i = pr_flag_jailsys[fi].disable && 2104 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2105 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2106 : JAIL_SYS_INHERIT; 2107 error = 2108 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2109 if (error != 0 && error != ENOENT) 2110 goto done_deref; 2111 } 2112 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 2113 fi++) { 2114 if (pr_allow_names[fi] == NULL) 2115 continue; 2116 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2117 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2118 if (error != 0 && error != ENOENT) 2119 goto done_deref; 2120 i = !i; 2121 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2122 if (error != 0 && error != ENOENT) 2123 goto done_deref; 2124 } 2125 i = (pr->pr_uref == 0); 2126 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2127 if (error != 0 && error != ENOENT) 2128 goto done_deref; 2129 i = !i; 2130 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2131 if (error != 0 && error != ENOENT) 2132 goto done_deref; 2133 2134 /* Get the module parameters. */ 2135 mtx_unlock(&pr->pr_mtx); 2136 locked = 0; 2137 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2138 if (error) 2139 goto done_deref; 2140 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2141 2142 /* By now, all parameters should have been noted. */ 2143 TAILQ_FOREACH(opt, opts, link) { 2144 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2145 error = EINVAL; 2146 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2147 goto done_errmsg; 2148 } 2149 } 2150 2151 /* Write the fetched parameters back to userspace. */ 2152 error = 0; 2153 TAILQ_FOREACH(opt, opts, link) { 2154 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2155 pos = 2 * opt->pos + 1; 2156 optuio->uio_iov[pos].iov_len = opt->len; 2157 if (opt->value != NULL) { 2158 if (optuio->uio_segflg == UIO_SYSSPACE) { 2159 bcopy(opt->value, 2160 optuio->uio_iov[pos].iov_base, 2161 opt->len); 2162 } else { 2163 error = copyout(opt->value, 2164 optuio->uio_iov[pos].iov_base, 2165 opt->len); 2166 if (error) 2167 break; 2168 } 2169 } 2170 } 2171 } 2172 goto done_errmsg; 2173 2174 done_deref: 2175 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2176 goto done_errmsg; 2177 2178 done_unlock_list: 2179 sx_sunlock(&allprison_lock); 2180 done_errmsg: 2181 if (error && errmsg_pos >= 0) { 2182 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2183 errmsg_pos = 2 * errmsg_pos + 1; 2184 if (errmsg_len > 0) { 2185 if (optuio->uio_segflg == UIO_SYSSPACE) 2186 bcopy(errmsg, 2187 optuio->uio_iov[errmsg_pos].iov_base, 2188 errmsg_len); 2189 else 2190 copyout(errmsg, 2191 optuio->uio_iov[errmsg_pos].iov_base, 2192 errmsg_len); 2193 } 2194 } 2195 vfs_freeopts(opts); 2196 return (error); 2197 } 2198 2199 2200 /* 2201 * struct jail_remove_args { 2202 * int jid; 2203 * }; 2204 */ 2205 int 2206 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2207 { 2208 struct prison *pr, *cpr, *lpr, *tpr; 2209 int descend, error; 2210 2211 error = priv_check(td, PRIV_JAIL_REMOVE); 2212 if (error) 2213 return (error); 2214 2215 sx_xlock(&allprison_lock); 2216 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2217 if (pr == NULL) { 2218 sx_xunlock(&allprison_lock); 2219 return (EINVAL); 2220 } 2221 2222 /* Remove all descendants of this prison, then remove this prison. */ 2223 pr->pr_ref++; 2224 pr->pr_flags |= PR_REMOVE; 2225 if (!LIST_EMPTY(&pr->pr_children)) { 2226 mtx_unlock(&pr->pr_mtx); 2227 lpr = NULL; 2228 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2229 mtx_lock(&cpr->pr_mtx); 2230 if (cpr->pr_ref > 0) { 2231 tpr = cpr; 2232 cpr->pr_ref++; 2233 cpr->pr_flags |= PR_REMOVE; 2234 } else { 2235 /* Already removed - do not do it again. */ 2236 tpr = NULL; 2237 } 2238 mtx_unlock(&cpr->pr_mtx); 2239 if (lpr != NULL) { 2240 mtx_lock(&lpr->pr_mtx); 2241 prison_remove_one(lpr); 2242 sx_xlock(&allprison_lock); 2243 } 2244 lpr = tpr; 2245 } 2246 if (lpr != NULL) { 2247 mtx_lock(&lpr->pr_mtx); 2248 prison_remove_one(lpr); 2249 sx_xlock(&allprison_lock); 2250 } 2251 mtx_lock(&pr->pr_mtx); 2252 } 2253 prison_remove_one(pr); 2254 return (0); 2255 } 2256 2257 static void 2258 prison_remove_one(struct prison *pr) 2259 { 2260 struct proc *p; 2261 int deuref; 2262 2263 /* If the prison was persistent, it is not anymore. */ 2264 deuref = 0; 2265 if (pr->pr_flags & PR_PERSIST) { 2266 pr->pr_ref--; 2267 deuref = PD_DEUREF; 2268 pr->pr_flags &= ~PR_PERSIST; 2269 } 2270 2271 /* 2272 * jail_remove added a reference. If that's the only one, remove 2273 * the prison now. 2274 */ 2275 KASSERT(pr->pr_ref > 0, 2276 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2277 if (pr->pr_ref == 1) { 2278 prison_deref(pr, 2279 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2280 return; 2281 } 2282 2283 mtx_unlock(&pr->pr_mtx); 2284 sx_xunlock(&allprison_lock); 2285 /* 2286 * Kill all processes unfortunate enough to be attached to this prison. 2287 */ 2288 sx_slock(&allproc_lock); 2289 LIST_FOREACH(p, &allproc, p_list) { 2290 PROC_LOCK(p); 2291 if (p->p_state != PRS_NEW && p->p_ucred && 2292 p->p_ucred->cr_prison == pr) 2293 kern_psignal(p, SIGKILL); 2294 PROC_UNLOCK(p); 2295 } 2296 sx_sunlock(&allproc_lock); 2297 /* Remove the temporary reference added by jail_remove. */ 2298 prison_deref(pr, deuref | PD_DEREF); 2299 } 2300 2301 2302 /* 2303 * struct jail_attach_args { 2304 * int jid; 2305 * }; 2306 */ 2307 int 2308 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2309 { 2310 struct prison *pr; 2311 int error; 2312 2313 error = priv_check(td, PRIV_JAIL_ATTACH); 2314 if (error) 2315 return (error); 2316 2317 sx_slock(&allprison_lock); 2318 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2319 if (pr == NULL) { 2320 sx_sunlock(&allprison_lock); 2321 return (EINVAL); 2322 } 2323 2324 /* 2325 * Do not allow a process to attach to a prison that is not 2326 * considered to be "alive". 2327 */ 2328 if (pr->pr_uref == 0) { 2329 mtx_unlock(&pr->pr_mtx); 2330 sx_sunlock(&allprison_lock); 2331 return (EINVAL); 2332 } 2333 2334 return (do_jail_attach(td, pr)); 2335 } 2336 2337 static int 2338 do_jail_attach(struct thread *td, struct prison *pr) 2339 { 2340 struct prison *ppr; 2341 struct proc *p; 2342 struct ucred *newcred, *oldcred; 2343 int vfslocked, error; 2344 2345 /* 2346 * XXX: Note that there is a slight race here if two threads 2347 * in the same privileged process attempt to attach to two 2348 * different jails at the same time. It is important for 2349 * user processes not to do this, or they might end up with 2350 * a process root from one prison, but attached to the jail 2351 * of another. 2352 */ 2353 pr->pr_ref++; 2354 pr->pr_uref++; 2355 mtx_unlock(&pr->pr_mtx); 2356 2357 /* Let modules do whatever they need to prepare for attaching. */ 2358 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2359 if (error) { 2360 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2361 return (error); 2362 } 2363 sx_sunlock(&allprison_lock); 2364 2365 /* 2366 * Reparent the newly attached process to this jail. 2367 */ 2368 ppr = td->td_ucred->cr_prison; 2369 p = td->td_proc; 2370 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2371 if (error) 2372 goto e_revert_osd; 2373 2374 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount); 2375 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2376 if ((error = change_dir(pr->pr_root, td)) != 0) 2377 goto e_unlock; 2378 #ifdef MAC 2379 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2380 goto e_unlock; 2381 #endif 2382 VOP_UNLOCK(pr->pr_root, 0); 2383 if ((error = change_root(pr->pr_root, td))) 2384 goto e_unlock_giant; 2385 VFS_UNLOCK_GIANT(vfslocked); 2386 2387 newcred = crget(); 2388 PROC_LOCK(p); 2389 oldcred = p->p_ucred; 2390 setsugid(p); 2391 crcopy(newcred, oldcred); 2392 newcred->cr_prison = pr; 2393 p->p_ucred = newcred; 2394 PROC_UNLOCK(p); 2395 #ifdef RACCT 2396 racct_proc_ucred_changed(p, oldcred, newcred); 2397 #endif 2398 crfree(oldcred); 2399 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2400 return (0); 2401 e_unlock: 2402 VOP_UNLOCK(pr->pr_root, 0); 2403 e_unlock_giant: 2404 VFS_UNLOCK_GIANT(vfslocked); 2405 e_revert_osd: 2406 /* Tell modules this thread is still in its old jail after all. */ 2407 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2408 prison_deref(pr, PD_DEREF | PD_DEUREF); 2409 return (error); 2410 } 2411 2412 2413 /* 2414 * Returns a locked prison instance, or NULL on failure. 2415 */ 2416 struct prison * 2417 prison_find(int prid) 2418 { 2419 struct prison *pr; 2420 2421 sx_assert(&allprison_lock, SX_LOCKED); 2422 TAILQ_FOREACH(pr, &allprison, pr_list) { 2423 if (pr->pr_id == prid) { 2424 mtx_lock(&pr->pr_mtx); 2425 if (pr->pr_ref > 0) 2426 return (pr); 2427 mtx_unlock(&pr->pr_mtx); 2428 } 2429 } 2430 return (NULL); 2431 } 2432 2433 /* 2434 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2435 */ 2436 struct prison * 2437 prison_find_child(struct prison *mypr, int prid) 2438 { 2439 struct prison *pr; 2440 int descend; 2441 2442 sx_assert(&allprison_lock, SX_LOCKED); 2443 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2444 if (pr->pr_id == prid) { 2445 mtx_lock(&pr->pr_mtx); 2446 if (pr->pr_ref > 0) 2447 return (pr); 2448 mtx_unlock(&pr->pr_mtx); 2449 } 2450 } 2451 return (NULL); 2452 } 2453 2454 /* 2455 * Look for the name relative to mypr. Returns a locked prison or NULL. 2456 */ 2457 struct prison * 2458 prison_find_name(struct prison *mypr, const char *name) 2459 { 2460 struct prison *pr, *deadpr; 2461 size_t mylen; 2462 int descend; 2463 2464 sx_assert(&allprison_lock, SX_LOCKED); 2465 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2466 again: 2467 deadpr = NULL; 2468 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2469 if (!strcmp(pr->pr_name + mylen, name)) { 2470 mtx_lock(&pr->pr_mtx); 2471 if (pr->pr_ref > 0) { 2472 if (pr->pr_uref > 0) 2473 return (pr); 2474 deadpr = pr; 2475 } 2476 mtx_unlock(&pr->pr_mtx); 2477 } 2478 } 2479 /* There was no valid prison - perhaps there was a dying one. */ 2480 if (deadpr != NULL) { 2481 mtx_lock(&deadpr->pr_mtx); 2482 if (deadpr->pr_ref == 0) { 2483 mtx_unlock(&deadpr->pr_mtx); 2484 goto again; 2485 } 2486 } 2487 return (deadpr); 2488 } 2489 2490 /* 2491 * See if a prison has the specific flag set. 2492 */ 2493 int 2494 prison_flag(struct ucred *cred, unsigned flag) 2495 { 2496 2497 /* This is an atomic read, so no locking is necessary. */ 2498 return (cred->cr_prison->pr_flags & flag); 2499 } 2500 2501 int 2502 prison_allow(struct ucred *cred, unsigned flag) 2503 { 2504 2505 /* This is an atomic read, so no locking is necessary. */ 2506 return (cred->cr_prison->pr_allow & flag); 2507 } 2508 2509 /* 2510 * Remove a prison reference. If that was the last reference, remove the 2511 * prison itself - but not in this context in case there are locks held. 2512 */ 2513 void 2514 prison_free_locked(struct prison *pr) 2515 { 2516 2517 mtx_assert(&pr->pr_mtx, MA_OWNED); 2518 pr->pr_ref--; 2519 if (pr->pr_ref == 0) { 2520 mtx_unlock(&pr->pr_mtx); 2521 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2522 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2523 return; 2524 } 2525 mtx_unlock(&pr->pr_mtx); 2526 } 2527 2528 void 2529 prison_free(struct prison *pr) 2530 { 2531 2532 mtx_lock(&pr->pr_mtx); 2533 prison_free_locked(pr); 2534 } 2535 2536 static void 2537 prison_complete(void *context, int pending) 2538 { 2539 2540 prison_deref((struct prison *)context, 0); 2541 } 2542 2543 /* 2544 * Remove a prison reference (usually). This internal version assumes no 2545 * mutexes are held, except perhaps the prison itself. If there are no more 2546 * references, release and delist the prison. On completion, the prison lock 2547 * and the allprison lock are both unlocked. 2548 */ 2549 static void 2550 prison_deref(struct prison *pr, int flags) 2551 { 2552 struct prison *ppr, *tpr; 2553 int vfslocked; 2554 2555 if (!(flags & PD_LOCKED)) 2556 mtx_lock(&pr->pr_mtx); 2557 for (;;) { 2558 if (flags & PD_DEUREF) { 2559 pr->pr_uref--; 2560 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2561 } 2562 if (flags & PD_DEREF) 2563 pr->pr_ref--; 2564 /* If the prison still has references, nothing else to do. */ 2565 if (pr->pr_ref > 0) { 2566 mtx_unlock(&pr->pr_mtx); 2567 if (flags & PD_LIST_SLOCKED) 2568 sx_sunlock(&allprison_lock); 2569 else if (flags & PD_LIST_XLOCKED) 2570 sx_xunlock(&allprison_lock); 2571 return; 2572 } 2573 2574 mtx_unlock(&pr->pr_mtx); 2575 if (flags & PD_LIST_SLOCKED) { 2576 if (!sx_try_upgrade(&allprison_lock)) { 2577 sx_sunlock(&allprison_lock); 2578 sx_xlock(&allprison_lock); 2579 } 2580 } else if (!(flags & PD_LIST_XLOCKED)) 2581 sx_xlock(&allprison_lock); 2582 2583 TAILQ_REMOVE(&allprison, pr, pr_list); 2584 LIST_REMOVE(pr, pr_sibling); 2585 ppr = pr->pr_parent; 2586 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2587 tpr->pr_childcount--; 2588 sx_xunlock(&allprison_lock); 2589 2590 #ifdef VIMAGE 2591 if (pr->pr_vnet != ppr->pr_vnet) 2592 vnet_destroy(pr->pr_vnet); 2593 #endif 2594 if (pr->pr_root != NULL) { 2595 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount); 2596 vrele(pr->pr_root); 2597 VFS_UNLOCK_GIANT(vfslocked); 2598 } 2599 mtx_destroy(&pr->pr_mtx); 2600 #ifdef INET 2601 free(pr->pr_ip4, M_PRISON); 2602 #endif 2603 #ifdef INET6 2604 free(pr->pr_ip6, M_PRISON); 2605 #endif 2606 if (pr->pr_cpuset != NULL) 2607 cpuset_rel(pr->pr_cpuset); 2608 osd_jail_exit(pr); 2609 #ifdef RACCT 2610 prison_racct_detach(pr); 2611 #endif 2612 free(pr, M_PRISON); 2613 2614 /* Removing a prison frees a reference on its parent. */ 2615 pr = ppr; 2616 mtx_lock(&pr->pr_mtx); 2617 flags = PD_DEREF | PD_DEUREF; 2618 } 2619 } 2620 2621 void 2622 prison_hold_locked(struct prison *pr) 2623 { 2624 2625 mtx_assert(&pr->pr_mtx, MA_OWNED); 2626 KASSERT(pr->pr_ref > 0, 2627 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2628 pr->pr_ref++; 2629 } 2630 2631 void 2632 prison_hold(struct prison *pr) 2633 { 2634 2635 mtx_lock(&pr->pr_mtx); 2636 prison_hold_locked(pr); 2637 mtx_unlock(&pr->pr_mtx); 2638 } 2639 2640 void 2641 prison_proc_hold(struct prison *pr) 2642 { 2643 2644 mtx_lock(&pr->pr_mtx); 2645 KASSERT(pr->pr_uref > 0, 2646 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2647 pr->pr_uref++; 2648 mtx_unlock(&pr->pr_mtx); 2649 } 2650 2651 void 2652 prison_proc_free(struct prison *pr) 2653 { 2654 2655 mtx_lock(&pr->pr_mtx); 2656 KASSERT(pr->pr_uref > 0, 2657 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2658 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2659 } 2660 2661 2662 #ifdef INET 2663 /* 2664 * Restrict a prison's IP address list with its parent's, possibly replacing 2665 * it. Return true if the replacement buffer was used (or would have been). 2666 */ 2667 static int 2668 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2669 { 2670 int ii, ij, used; 2671 struct prison *ppr; 2672 2673 ppr = pr->pr_parent; 2674 if (!(pr->pr_flags & PR_IP4_USER)) { 2675 /* This has no user settings, so just copy the parent's list. */ 2676 if (pr->pr_ip4s < ppr->pr_ip4s) { 2677 /* 2678 * There's no room for the parent's list. Use the 2679 * new list buffer, which is assumed to be big enough 2680 * (if it was passed). If there's no buffer, try to 2681 * allocate one. 2682 */ 2683 used = 1; 2684 if (newip4 == NULL) { 2685 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2686 M_PRISON, M_NOWAIT); 2687 if (newip4 != NULL) 2688 used = 0; 2689 } 2690 if (newip4 != NULL) { 2691 bcopy(ppr->pr_ip4, newip4, 2692 ppr->pr_ip4s * sizeof(*newip4)); 2693 free(pr->pr_ip4, M_PRISON); 2694 pr->pr_ip4 = newip4; 2695 pr->pr_ip4s = ppr->pr_ip4s; 2696 } 2697 return (used); 2698 } 2699 pr->pr_ip4s = ppr->pr_ip4s; 2700 if (pr->pr_ip4s > 0) 2701 bcopy(ppr->pr_ip4, pr->pr_ip4, 2702 pr->pr_ip4s * sizeof(*newip4)); 2703 else if (pr->pr_ip4 != NULL) { 2704 free(pr->pr_ip4, M_PRISON); 2705 pr->pr_ip4 = NULL; 2706 } 2707 } else if (pr->pr_ip4s > 0) { 2708 /* Remove addresses that aren't in the parent. */ 2709 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2710 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2711 break; 2712 if (ij < ppr->pr_ip4s) 2713 ii = 1; 2714 else { 2715 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2716 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2717 ii = 0; 2718 } 2719 for (ij = 1; ii < pr->pr_ip4s; ) { 2720 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2721 ii++; 2722 continue; 2723 } 2724 switch (ij >= ppr->pr_ip4s ? -1 : 2725 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2726 case -1: 2727 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2728 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2729 break; 2730 case 0: 2731 ii++; 2732 ij++; 2733 break; 2734 case 1: 2735 ij++; 2736 break; 2737 } 2738 } 2739 if (pr->pr_ip4s == 0) { 2740 pr->pr_flags |= PR_IP4_DISABLE; 2741 free(pr->pr_ip4, M_PRISON); 2742 pr->pr_ip4 = NULL; 2743 } 2744 } 2745 return (0); 2746 } 2747 2748 /* 2749 * Pass back primary IPv4 address of this jail. 2750 * 2751 * If not restricted return success but do not alter the address. Caller has 2752 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2753 * 2754 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2755 * Address returned in NBO. 2756 */ 2757 int 2758 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2759 { 2760 struct prison *pr; 2761 2762 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2763 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2764 2765 pr = cred->cr_prison; 2766 if (!(pr->pr_flags & PR_IP4)) 2767 return (0); 2768 mtx_lock(&pr->pr_mtx); 2769 if (!(pr->pr_flags & PR_IP4)) { 2770 mtx_unlock(&pr->pr_mtx); 2771 return (0); 2772 } 2773 if (pr->pr_ip4 == NULL) { 2774 mtx_unlock(&pr->pr_mtx); 2775 return (EAFNOSUPPORT); 2776 } 2777 2778 ia->s_addr = pr->pr_ip4[0].s_addr; 2779 mtx_unlock(&pr->pr_mtx); 2780 return (0); 2781 } 2782 2783 /* 2784 * Return 1 if we should do proper source address selection or are not jailed. 2785 * We will return 0 if we should bypass source address selection in favour 2786 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2787 * returned in NBO. 2788 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2789 */ 2790 int 2791 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2792 { 2793 struct prison *pr; 2794 struct in_addr lia; 2795 int error; 2796 2797 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2798 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2799 2800 if (!jailed(cred)) 2801 return (1); 2802 2803 pr = cred->cr_prison; 2804 if (pr->pr_flags & PR_IP4_SADDRSEL) 2805 return (1); 2806 2807 lia.s_addr = INADDR_ANY; 2808 error = prison_get_ip4(cred, &lia); 2809 if (error) 2810 return (error); 2811 if (lia.s_addr == INADDR_ANY) 2812 return (1); 2813 2814 ia->s_addr = lia.s_addr; 2815 return (0); 2816 } 2817 2818 /* 2819 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2820 */ 2821 int 2822 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2823 { 2824 2825 if (pr1 == pr2) 2826 return (1); 2827 2828 /* 2829 * No need to lock since the PR_IP4_USER flag can't be altered for 2830 * existing prisons. 2831 */ 2832 while (pr1 != &prison0 && 2833 #ifdef VIMAGE 2834 !(pr1->pr_flags & PR_VNET) && 2835 #endif 2836 !(pr1->pr_flags & PR_IP4_USER)) 2837 pr1 = pr1->pr_parent; 2838 while (pr2 != &prison0 && 2839 #ifdef VIMAGE 2840 !(pr2->pr_flags & PR_VNET) && 2841 #endif 2842 !(pr2->pr_flags & PR_IP4_USER)) 2843 pr2 = pr2->pr_parent; 2844 return (pr1 == pr2); 2845 } 2846 2847 /* 2848 * Make sure our (source) address is set to something meaningful to this 2849 * jail. 2850 * 2851 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2852 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2853 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2854 */ 2855 int 2856 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2857 { 2858 struct prison *pr; 2859 struct in_addr ia0; 2860 int error; 2861 2862 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2863 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2864 2865 pr = cred->cr_prison; 2866 if (!(pr->pr_flags & PR_IP4)) 2867 return (0); 2868 mtx_lock(&pr->pr_mtx); 2869 if (!(pr->pr_flags & PR_IP4)) { 2870 mtx_unlock(&pr->pr_mtx); 2871 return (0); 2872 } 2873 if (pr->pr_ip4 == NULL) { 2874 mtx_unlock(&pr->pr_mtx); 2875 return (EAFNOSUPPORT); 2876 } 2877 2878 ia0.s_addr = ntohl(ia->s_addr); 2879 if (ia0.s_addr == INADDR_LOOPBACK) { 2880 ia->s_addr = pr->pr_ip4[0].s_addr; 2881 mtx_unlock(&pr->pr_mtx); 2882 return (0); 2883 } 2884 2885 if (ia0.s_addr == INADDR_ANY) { 2886 /* 2887 * In case there is only 1 IPv4 address, bind directly. 2888 */ 2889 if (pr->pr_ip4s == 1) 2890 ia->s_addr = pr->pr_ip4[0].s_addr; 2891 mtx_unlock(&pr->pr_mtx); 2892 return (0); 2893 } 2894 2895 error = _prison_check_ip4(pr, ia); 2896 mtx_unlock(&pr->pr_mtx); 2897 return (error); 2898 } 2899 2900 /* 2901 * Rewrite destination address in case we will connect to loopback address. 2902 * 2903 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2904 * Address passed in in NBO and returned in NBO. 2905 */ 2906 int 2907 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2908 { 2909 struct prison *pr; 2910 2911 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2912 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2913 2914 pr = cred->cr_prison; 2915 if (!(pr->pr_flags & PR_IP4)) 2916 return (0); 2917 mtx_lock(&pr->pr_mtx); 2918 if (!(pr->pr_flags & PR_IP4)) { 2919 mtx_unlock(&pr->pr_mtx); 2920 return (0); 2921 } 2922 if (pr->pr_ip4 == NULL) { 2923 mtx_unlock(&pr->pr_mtx); 2924 return (EAFNOSUPPORT); 2925 } 2926 2927 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2928 ia->s_addr = pr->pr_ip4[0].s_addr; 2929 mtx_unlock(&pr->pr_mtx); 2930 return (0); 2931 } 2932 2933 /* 2934 * Return success because nothing had to be changed. 2935 */ 2936 mtx_unlock(&pr->pr_mtx); 2937 return (0); 2938 } 2939 2940 /* 2941 * Check if given address belongs to the jail referenced by cred/prison. 2942 * 2943 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2944 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2945 * doesn't allow IPv4. Address passed in in NBO. 2946 */ 2947 static int 2948 _prison_check_ip4(struct prison *pr, struct in_addr *ia) 2949 { 2950 int i, a, z, d; 2951 2952 /* 2953 * Check the primary IP. 2954 */ 2955 if (pr->pr_ip4[0].s_addr == ia->s_addr) 2956 return (0); 2957 2958 /* 2959 * All the other IPs are sorted so we can do a binary search. 2960 */ 2961 a = 0; 2962 z = pr->pr_ip4s - 2; 2963 while (a <= z) { 2964 i = (a + z) / 2; 2965 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 2966 if (d > 0) 2967 z = i - 1; 2968 else if (d < 0) 2969 a = i + 1; 2970 else 2971 return (0); 2972 } 2973 2974 return (EADDRNOTAVAIL); 2975 } 2976 2977 int 2978 prison_check_ip4(struct ucred *cred, struct in_addr *ia) 2979 { 2980 struct prison *pr; 2981 int error; 2982 2983 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2984 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2985 2986 pr = cred->cr_prison; 2987 if (!(pr->pr_flags & PR_IP4)) 2988 return (0); 2989 mtx_lock(&pr->pr_mtx); 2990 if (!(pr->pr_flags & PR_IP4)) { 2991 mtx_unlock(&pr->pr_mtx); 2992 return (0); 2993 } 2994 if (pr->pr_ip4 == NULL) { 2995 mtx_unlock(&pr->pr_mtx); 2996 return (EAFNOSUPPORT); 2997 } 2998 2999 error = _prison_check_ip4(pr, ia); 3000 mtx_unlock(&pr->pr_mtx); 3001 return (error); 3002 } 3003 #endif 3004 3005 #ifdef INET6 3006 static int 3007 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 3008 { 3009 int ii, ij, used; 3010 struct prison *ppr; 3011 3012 ppr = pr->pr_parent; 3013 if (!(pr->pr_flags & PR_IP6_USER)) { 3014 /* This has no user settings, so just copy the parent's list. */ 3015 if (pr->pr_ip6s < ppr->pr_ip6s) { 3016 /* 3017 * There's no room for the parent's list. Use the 3018 * new list buffer, which is assumed to be big enough 3019 * (if it was passed). If there's no buffer, try to 3020 * allocate one. 3021 */ 3022 used = 1; 3023 if (newip6 == NULL) { 3024 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 3025 M_PRISON, M_NOWAIT); 3026 if (newip6 != NULL) 3027 used = 0; 3028 } 3029 if (newip6 != NULL) { 3030 bcopy(ppr->pr_ip6, newip6, 3031 ppr->pr_ip6s * sizeof(*newip6)); 3032 free(pr->pr_ip6, M_PRISON); 3033 pr->pr_ip6 = newip6; 3034 pr->pr_ip6s = ppr->pr_ip6s; 3035 } 3036 return (used); 3037 } 3038 pr->pr_ip6s = ppr->pr_ip6s; 3039 if (pr->pr_ip6s > 0) 3040 bcopy(ppr->pr_ip6, pr->pr_ip6, 3041 pr->pr_ip6s * sizeof(*newip6)); 3042 else if (pr->pr_ip6 != NULL) { 3043 free(pr->pr_ip6, M_PRISON); 3044 pr->pr_ip6 = NULL; 3045 } 3046 } else if (pr->pr_ip6s > 0) { 3047 /* Remove addresses that aren't in the parent. */ 3048 for (ij = 0; ij < ppr->pr_ip6s; ij++) 3049 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 3050 &ppr->pr_ip6[ij])) 3051 break; 3052 if (ij < ppr->pr_ip6s) 3053 ii = 1; 3054 else { 3055 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 3056 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 3057 ii = 0; 3058 } 3059 for (ij = 1; ii < pr->pr_ip6s; ) { 3060 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 3061 &ppr->pr_ip6[0])) { 3062 ii++; 3063 continue; 3064 } 3065 switch (ij >= ppr->pr_ip6s ? -1 : 3066 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 3067 case -1: 3068 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 3069 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 3070 break; 3071 case 0: 3072 ii++; 3073 ij++; 3074 break; 3075 case 1: 3076 ij++; 3077 break; 3078 } 3079 } 3080 if (pr->pr_ip6s == 0) { 3081 pr->pr_flags |= PR_IP6_DISABLE; 3082 free(pr->pr_ip6, M_PRISON); 3083 pr->pr_ip6 = NULL; 3084 } 3085 } 3086 return 0; 3087 } 3088 3089 /* 3090 * Pass back primary IPv6 address for this jail. 3091 * 3092 * If not restricted return success but do not alter the address. Caller has 3093 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3094 * 3095 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3096 */ 3097 int 3098 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3099 { 3100 struct prison *pr; 3101 3102 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3103 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3104 3105 pr = cred->cr_prison; 3106 if (!(pr->pr_flags & PR_IP6)) 3107 return (0); 3108 mtx_lock(&pr->pr_mtx); 3109 if (!(pr->pr_flags & PR_IP6)) { 3110 mtx_unlock(&pr->pr_mtx); 3111 return (0); 3112 } 3113 if (pr->pr_ip6 == NULL) { 3114 mtx_unlock(&pr->pr_mtx); 3115 return (EAFNOSUPPORT); 3116 } 3117 3118 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3119 mtx_unlock(&pr->pr_mtx); 3120 return (0); 3121 } 3122 3123 /* 3124 * Return 1 if we should do proper source address selection or are not jailed. 3125 * We will return 0 if we should bypass source address selection in favour 3126 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3127 * returned in NBO. 3128 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3129 */ 3130 int 3131 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3132 { 3133 struct prison *pr; 3134 struct in6_addr lia6; 3135 int error; 3136 3137 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3138 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3139 3140 if (!jailed(cred)) 3141 return (1); 3142 3143 pr = cred->cr_prison; 3144 if (pr->pr_flags & PR_IP6_SADDRSEL) 3145 return (1); 3146 3147 lia6 = in6addr_any; 3148 error = prison_get_ip6(cred, &lia6); 3149 if (error) 3150 return (error); 3151 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3152 return (1); 3153 3154 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3155 return (0); 3156 } 3157 3158 /* 3159 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3160 */ 3161 int 3162 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3163 { 3164 3165 if (pr1 == pr2) 3166 return (1); 3167 3168 while (pr1 != &prison0 && 3169 #ifdef VIMAGE 3170 !(pr1->pr_flags & PR_VNET) && 3171 #endif 3172 !(pr1->pr_flags & PR_IP6_USER)) 3173 pr1 = pr1->pr_parent; 3174 while (pr2 != &prison0 && 3175 #ifdef VIMAGE 3176 !(pr2->pr_flags & PR_VNET) && 3177 #endif 3178 !(pr2->pr_flags & PR_IP6_USER)) 3179 pr2 = pr2->pr_parent; 3180 return (pr1 == pr2); 3181 } 3182 3183 /* 3184 * Make sure our (source) address is set to something meaningful to this jail. 3185 * 3186 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3187 * when needed while binding. 3188 * 3189 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3190 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3191 * doesn't allow IPv6. 3192 */ 3193 int 3194 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3195 { 3196 struct prison *pr; 3197 int error; 3198 3199 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3200 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3201 3202 pr = cred->cr_prison; 3203 if (!(pr->pr_flags & PR_IP6)) 3204 return (0); 3205 mtx_lock(&pr->pr_mtx); 3206 if (!(pr->pr_flags & PR_IP6)) { 3207 mtx_unlock(&pr->pr_mtx); 3208 return (0); 3209 } 3210 if (pr->pr_ip6 == NULL) { 3211 mtx_unlock(&pr->pr_mtx); 3212 return (EAFNOSUPPORT); 3213 } 3214 3215 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3216 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3217 mtx_unlock(&pr->pr_mtx); 3218 return (0); 3219 } 3220 3221 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3222 /* 3223 * In case there is only 1 IPv6 address, and v6only is true, 3224 * then bind directly. 3225 */ 3226 if (v6only != 0 && pr->pr_ip6s == 1) 3227 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3228 mtx_unlock(&pr->pr_mtx); 3229 return (0); 3230 } 3231 3232 error = _prison_check_ip6(pr, ia6); 3233 mtx_unlock(&pr->pr_mtx); 3234 return (error); 3235 } 3236 3237 /* 3238 * Rewrite destination address in case we will connect to loopback address. 3239 * 3240 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3241 */ 3242 int 3243 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3244 { 3245 struct prison *pr; 3246 3247 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3248 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3249 3250 pr = cred->cr_prison; 3251 if (!(pr->pr_flags & PR_IP6)) 3252 return (0); 3253 mtx_lock(&pr->pr_mtx); 3254 if (!(pr->pr_flags & PR_IP6)) { 3255 mtx_unlock(&pr->pr_mtx); 3256 return (0); 3257 } 3258 if (pr->pr_ip6 == NULL) { 3259 mtx_unlock(&pr->pr_mtx); 3260 return (EAFNOSUPPORT); 3261 } 3262 3263 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3264 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3265 mtx_unlock(&pr->pr_mtx); 3266 return (0); 3267 } 3268 3269 /* 3270 * Return success because nothing had to be changed. 3271 */ 3272 mtx_unlock(&pr->pr_mtx); 3273 return (0); 3274 } 3275 3276 /* 3277 * Check if given address belongs to the jail referenced by cred/prison. 3278 * 3279 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3280 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3281 * doesn't allow IPv6. 3282 */ 3283 static int 3284 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3285 { 3286 int i, a, z, d; 3287 3288 /* 3289 * Check the primary IP. 3290 */ 3291 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3292 return (0); 3293 3294 /* 3295 * All the other IPs are sorted so we can do a binary search. 3296 */ 3297 a = 0; 3298 z = pr->pr_ip6s - 2; 3299 while (a <= z) { 3300 i = (a + z) / 2; 3301 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3302 if (d > 0) 3303 z = i - 1; 3304 else if (d < 0) 3305 a = i + 1; 3306 else 3307 return (0); 3308 } 3309 3310 return (EADDRNOTAVAIL); 3311 } 3312 3313 int 3314 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3315 { 3316 struct prison *pr; 3317 int error; 3318 3319 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3320 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3321 3322 pr = cred->cr_prison; 3323 if (!(pr->pr_flags & PR_IP6)) 3324 return (0); 3325 mtx_lock(&pr->pr_mtx); 3326 if (!(pr->pr_flags & PR_IP6)) { 3327 mtx_unlock(&pr->pr_mtx); 3328 return (0); 3329 } 3330 if (pr->pr_ip6 == NULL) { 3331 mtx_unlock(&pr->pr_mtx); 3332 return (EAFNOSUPPORT); 3333 } 3334 3335 error = _prison_check_ip6(pr, ia6); 3336 mtx_unlock(&pr->pr_mtx); 3337 return (error); 3338 } 3339 #endif 3340 3341 /* 3342 * Check if a jail supports the given address family. 3343 * 3344 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3345 * if not. 3346 */ 3347 int 3348 prison_check_af(struct ucred *cred, int af) 3349 { 3350 struct prison *pr; 3351 int error; 3352 3353 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3354 3355 pr = cred->cr_prison; 3356 #ifdef VIMAGE 3357 /* Prisons with their own network stack are not limited. */ 3358 if (prison_owns_vnet(cred)) 3359 return (0); 3360 #endif 3361 3362 error = 0; 3363 switch (af) 3364 { 3365 #ifdef INET 3366 case AF_INET: 3367 if (pr->pr_flags & PR_IP4) 3368 { 3369 mtx_lock(&pr->pr_mtx); 3370 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3371 error = EAFNOSUPPORT; 3372 mtx_unlock(&pr->pr_mtx); 3373 } 3374 break; 3375 #endif 3376 #ifdef INET6 3377 case AF_INET6: 3378 if (pr->pr_flags & PR_IP6) 3379 { 3380 mtx_lock(&pr->pr_mtx); 3381 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3382 error = EAFNOSUPPORT; 3383 mtx_unlock(&pr->pr_mtx); 3384 } 3385 break; 3386 #endif 3387 case AF_LOCAL: 3388 case AF_ROUTE: 3389 break; 3390 default: 3391 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3392 error = EAFNOSUPPORT; 3393 } 3394 return (error); 3395 } 3396 3397 /* 3398 * Check if given address belongs to the jail referenced by cred (wrapper to 3399 * prison_check_ip[46]). 3400 * 3401 * Returns 0 if jail doesn't restrict the address family or if address belongs 3402 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3403 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3404 */ 3405 int 3406 prison_if(struct ucred *cred, struct sockaddr *sa) 3407 { 3408 #ifdef INET 3409 struct sockaddr_in *sai; 3410 #endif 3411 #ifdef INET6 3412 struct sockaddr_in6 *sai6; 3413 #endif 3414 int error; 3415 3416 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3417 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3418 3419 #ifdef VIMAGE 3420 if (prison_owns_vnet(cred)) 3421 return (0); 3422 #endif 3423 3424 error = 0; 3425 switch (sa->sa_family) 3426 { 3427 #ifdef INET 3428 case AF_INET: 3429 sai = (struct sockaddr_in *)sa; 3430 error = prison_check_ip4(cred, &sai->sin_addr); 3431 break; 3432 #endif 3433 #ifdef INET6 3434 case AF_INET6: 3435 sai6 = (struct sockaddr_in6 *)sa; 3436 error = prison_check_ip6(cred, &sai6->sin6_addr); 3437 break; 3438 #endif 3439 default: 3440 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3441 error = EAFNOSUPPORT; 3442 } 3443 return (error); 3444 } 3445 3446 /* 3447 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3448 */ 3449 int 3450 prison_check(struct ucred *cred1, struct ucred *cred2) 3451 { 3452 3453 return ((cred1->cr_prison == cred2->cr_prison || 3454 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3455 } 3456 3457 /* 3458 * Return 1 if p2 is a child of p1, otherwise 0. 3459 */ 3460 int 3461 prison_ischild(struct prison *pr1, struct prison *pr2) 3462 { 3463 3464 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3465 if (pr1 == pr2) 3466 return (1); 3467 return (0); 3468 } 3469 3470 /* 3471 * Return 1 if the passed credential is in a jail, otherwise 0. 3472 */ 3473 int 3474 jailed(struct ucred *cred) 3475 { 3476 3477 return (cred->cr_prison != &prison0); 3478 } 3479 3480 /* 3481 * Return 1 if the passed credential is in a jail and that jail does not 3482 * have its own virtual network stack, otherwise 0. 3483 */ 3484 int 3485 jailed_without_vnet(struct ucred *cred) 3486 { 3487 3488 if (!jailed(cred)) 3489 return (0); 3490 #ifdef VIMAGE 3491 if (prison_owns_vnet(cred)) 3492 return (0); 3493 #endif 3494 3495 return (1); 3496 } 3497 3498 /* 3499 * Return the correct hostname (domainname, et al) for the passed credential. 3500 */ 3501 void 3502 getcredhostname(struct ucred *cred, char *buf, size_t size) 3503 { 3504 struct prison *pr; 3505 3506 /* 3507 * A NULL credential can be used to shortcut to the physical 3508 * system's hostname. 3509 */ 3510 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3511 mtx_lock(&pr->pr_mtx); 3512 strlcpy(buf, pr->pr_hostname, size); 3513 mtx_unlock(&pr->pr_mtx); 3514 } 3515 3516 void 3517 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3518 { 3519 3520 mtx_lock(&cred->cr_prison->pr_mtx); 3521 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3522 mtx_unlock(&cred->cr_prison->pr_mtx); 3523 } 3524 3525 void 3526 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3527 { 3528 3529 mtx_lock(&cred->cr_prison->pr_mtx); 3530 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3531 mtx_unlock(&cred->cr_prison->pr_mtx); 3532 } 3533 3534 void 3535 getcredhostid(struct ucred *cred, unsigned long *hostid) 3536 { 3537 3538 mtx_lock(&cred->cr_prison->pr_mtx); 3539 *hostid = cred->cr_prison->pr_hostid; 3540 mtx_unlock(&cred->cr_prison->pr_mtx); 3541 } 3542 3543 #ifdef VIMAGE 3544 /* 3545 * Determine whether the prison represented by cred owns 3546 * its vnet rather than having it inherited. 3547 * 3548 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3549 */ 3550 int 3551 prison_owns_vnet(struct ucred *cred) 3552 { 3553 3554 /* 3555 * vnets cannot be added/removed after jail creation, 3556 * so no need to lock here. 3557 */ 3558 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3559 } 3560 #endif 3561 3562 /* 3563 * Determine whether the subject represented by cred can "see" 3564 * status of a mount point. 3565 * Returns: 0 for permitted, ENOENT otherwise. 3566 * XXX: This function should be called cr_canseemount() and should be 3567 * placed in kern_prot.c. 3568 */ 3569 int 3570 prison_canseemount(struct ucred *cred, struct mount *mp) 3571 { 3572 struct prison *pr; 3573 struct statfs *sp; 3574 size_t len; 3575 3576 pr = cred->cr_prison; 3577 if (pr->pr_enforce_statfs == 0) 3578 return (0); 3579 if (pr->pr_root->v_mount == mp) 3580 return (0); 3581 if (pr->pr_enforce_statfs == 2) 3582 return (ENOENT); 3583 /* 3584 * If jail's chroot directory is set to "/" we should be able to see 3585 * all mount-points from inside a jail. 3586 * This is ugly check, but this is the only situation when jail's 3587 * directory ends with '/'. 3588 */ 3589 if (strcmp(pr->pr_path, "/") == 0) 3590 return (0); 3591 len = strlen(pr->pr_path); 3592 sp = &mp->mnt_stat; 3593 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3594 return (ENOENT); 3595 /* 3596 * Be sure that we don't have situation where jail's root directory 3597 * is "/some/path" and mount point is "/some/pathpath". 3598 */ 3599 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3600 return (ENOENT); 3601 return (0); 3602 } 3603 3604 void 3605 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3606 { 3607 char jpath[MAXPATHLEN]; 3608 struct prison *pr; 3609 size_t len; 3610 3611 pr = cred->cr_prison; 3612 if (pr->pr_enforce_statfs == 0) 3613 return; 3614 if (prison_canseemount(cred, mp) != 0) { 3615 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3616 strlcpy(sp->f_mntonname, "[restricted]", 3617 sizeof(sp->f_mntonname)); 3618 return; 3619 } 3620 if (pr->pr_root->v_mount == mp) { 3621 /* 3622 * Clear current buffer data, so we are sure nothing from 3623 * the valid path left there. 3624 */ 3625 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3626 *sp->f_mntonname = '/'; 3627 return; 3628 } 3629 /* 3630 * If jail's chroot directory is set to "/" we should be able to see 3631 * all mount-points from inside a jail. 3632 */ 3633 if (strcmp(pr->pr_path, "/") == 0) 3634 return; 3635 len = strlen(pr->pr_path); 3636 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3637 /* 3638 * Clear current buffer data, so we are sure nothing from 3639 * the valid path left there. 3640 */ 3641 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3642 if (*jpath == '\0') { 3643 /* Should never happen. */ 3644 *sp->f_mntonname = '/'; 3645 } else { 3646 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3647 } 3648 } 3649 3650 /* 3651 * Check with permission for a specific privilege is granted within jail. We 3652 * have a specific list of accepted privileges; the rest are denied. 3653 */ 3654 int 3655 prison_priv_check(struct ucred *cred, int priv) 3656 { 3657 3658 if (!jailed(cred)) 3659 return (0); 3660 3661 #ifdef VIMAGE 3662 /* 3663 * Privileges specific to prisons with a virtual network stack. 3664 * There might be a duplicate entry here in case the privilege 3665 * is only granted conditionally in the legacy jail case. 3666 */ 3667 switch (priv) { 3668 #ifdef notyet 3669 /* 3670 * NFS-specific privileges. 3671 */ 3672 case PRIV_NFS_DAEMON: 3673 case PRIV_NFS_LOCKD: 3674 #endif 3675 /* 3676 * Network stack privileges. 3677 */ 3678 case PRIV_NET_BRIDGE: 3679 case PRIV_NET_GRE: 3680 case PRIV_NET_BPF: 3681 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3682 case PRIV_NET_ROUTE: 3683 case PRIV_NET_TAP: 3684 case PRIV_NET_SETIFMTU: 3685 case PRIV_NET_SETIFFLAGS: 3686 case PRIV_NET_SETIFCAP: 3687 case PRIV_NET_SETIFDESCR: 3688 case PRIV_NET_SETIFNAME : 3689 case PRIV_NET_SETIFMETRIC: 3690 case PRIV_NET_SETIFPHYS: 3691 case PRIV_NET_SETIFMAC: 3692 case PRIV_NET_ADDMULTI: 3693 case PRIV_NET_DELMULTI: 3694 case PRIV_NET_HWIOCTL: 3695 case PRIV_NET_SETLLADDR: 3696 case PRIV_NET_ADDIFGROUP: 3697 case PRIV_NET_DELIFGROUP: 3698 case PRIV_NET_IFCREATE: 3699 case PRIV_NET_IFDESTROY: 3700 case PRIV_NET_ADDIFADDR: 3701 case PRIV_NET_DELIFADDR: 3702 case PRIV_NET_LAGG: 3703 case PRIV_NET_GIF: 3704 case PRIV_NET_SETIFVNET: 3705 case PRIV_NET_SETIFFIB: 3706 3707 /* 3708 * 802.11-related privileges. 3709 */ 3710 case PRIV_NET80211_GETKEY: 3711 #ifdef notyet 3712 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3713 #endif 3714 3715 #ifdef notyet 3716 /* 3717 * AppleTalk privileges. 3718 */ 3719 case PRIV_NETATALK_RESERVEDPORT: 3720 3721 /* 3722 * ATM privileges. 3723 */ 3724 case PRIV_NETATM_CFG: 3725 case PRIV_NETATM_ADD: 3726 case PRIV_NETATM_DEL: 3727 case PRIV_NETATM_SET: 3728 3729 /* 3730 * Bluetooth privileges. 3731 */ 3732 case PRIV_NETBLUETOOTH_RAW: 3733 #endif 3734 3735 /* 3736 * Netgraph and netgraph module privileges. 3737 */ 3738 case PRIV_NETGRAPH_CONTROL: 3739 #ifdef notyet 3740 case PRIV_NETGRAPH_TTY: 3741 #endif 3742 3743 /* 3744 * IPv4 and IPv6 privileges. 3745 */ 3746 case PRIV_NETINET_IPFW: 3747 case PRIV_NETINET_DIVERT: 3748 case PRIV_NETINET_PF: 3749 case PRIV_NETINET_DUMMYNET: 3750 case PRIV_NETINET_CARP: 3751 case PRIV_NETINET_MROUTE: 3752 case PRIV_NETINET_RAW: 3753 case PRIV_NETINET_ADDRCTRL6: 3754 case PRIV_NETINET_ND6: 3755 case PRIV_NETINET_SCOPE6: 3756 case PRIV_NETINET_ALIFETIME6: 3757 case PRIV_NETINET_IPSEC: 3758 case PRIV_NETINET_BINDANY: 3759 3760 #ifdef notyet 3761 /* 3762 * IPX/SPX privileges. 3763 */ 3764 case PRIV_NETIPX_RESERVEDPORT: 3765 case PRIV_NETIPX_RAW: 3766 3767 /* 3768 * NCP privileges. 3769 */ 3770 case PRIV_NETNCP: 3771 3772 /* 3773 * SMB privileges. 3774 */ 3775 case PRIV_NETSMB: 3776 #endif 3777 3778 /* 3779 * No default: or deny here. 3780 * In case of no permit fall through to next switch(). 3781 */ 3782 if (cred->cr_prison->pr_flags & PR_VNET) 3783 return (0); 3784 } 3785 #endif /* VIMAGE */ 3786 3787 switch (priv) { 3788 3789 /* 3790 * Allow ktrace privileges for root in jail. 3791 */ 3792 case PRIV_KTRACE: 3793 3794 #if 0 3795 /* 3796 * Allow jailed processes to configure audit identity and 3797 * submit audit records (login, etc). In the future we may 3798 * want to further refine the relationship between audit and 3799 * jail. 3800 */ 3801 case PRIV_AUDIT_GETAUDIT: 3802 case PRIV_AUDIT_SETAUDIT: 3803 case PRIV_AUDIT_SUBMIT: 3804 #endif 3805 3806 /* 3807 * Allow jailed processes to manipulate process UNIX 3808 * credentials in any way they see fit. 3809 */ 3810 case PRIV_CRED_SETUID: 3811 case PRIV_CRED_SETEUID: 3812 case PRIV_CRED_SETGID: 3813 case PRIV_CRED_SETEGID: 3814 case PRIV_CRED_SETGROUPS: 3815 case PRIV_CRED_SETREUID: 3816 case PRIV_CRED_SETREGID: 3817 case PRIV_CRED_SETRESUID: 3818 case PRIV_CRED_SETRESGID: 3819 3820 /* 3821 * Jail implements visibility constraints already, so allow 3822 * jailed root to override uid/gid-based constraints. 3823 */ 3824 case PRIV_SEEOTHERGIDS: 3825 case PRIV_SEEOTHERUIDS: 3826 3827 /* 3828 * Jail implements inter-process debugging limits already, so 3829 * allow jailed root various debugging privileges. 3830 */ 3831 case PRIV_DEBUG_DIFFCRED: 3832 case PRIV_DEBUG_SUGID: 3833 case PRIV_DEBUG_UNPRIV: 3834 3835 /* 3836 * Allow jail to set various resource limits and login 3837 * properties, and for now, exceed process resource limits. 3838 */ 3839 case PRIV_PROC_LIMIT: 3840 case PRIV_PROC_SETLOGIN: 3841 case PRIV_PROC_SETRLIMIT: 3842 3843 /* 3844 * System V and POSIX IPC privileges are granted in jail. 3845 */ 3846 case PRIV_IPC_READ: 3847 case PRIV_IPC_WRITE: 3848 case PRIV_IPC_ADMIN: 3849 case PRIV_IPC_MSGSIZE: 3850 case PRIV_MQ_ADMIN: 3851 3852 /* 3853 * Jail operations within a jail work on child jails. 3854 */ 3855 case PRIV_JAIL_ATTACH: 3856 case PRIV_JAIL_SET: 3857 case PRIV_JAIL_REMOVE: 3858 3859 /* 3860 * Jail implements its own inter-process limits, so allow 3861 * root processes in jail to change scheduling on other 3862 * processes in the same jail. Likewise for signalling. 3863 */ 3864 case PRIV_SCHED_DIFFCRED: 3865 case PRIV_SCHED_CPUSET: 3866 case PRIV_SIGNAL_DIFFCRED: 3867 case PRIV_SIGNAL_SUGID: 3868 3869 /* 3870 * Allow jailed processes to write to sysctls marked as jail 3871 * writable. 3872 */ 3873 case PRIV_SYSCTL_WRITEJAIL: 3874 3875 /* 3876 * Allow root in jail to manage a variety of quota 3877 * properties. These should likely be conditional on a 3878 * configuration option. 3879 */ 3880 case PRIV_VFS_GETQUOTA: 3881 case PRIV_VFS_SETQUOTA: 3882 3883 /* 3884 * Since Jail relies on chroot() to implement file system 3885 * protections, grant many VFS privileges to root in jail. 3886 * Be careful to exclude mount-related and NFS-related 3887 * privileges. 3888 */ 3889 case PRIV_VFS_READ: 3890 case PRIV_VFS_WRITE: 3891 case PRIV_VFS_ADMIN: 3892 case PRIV_VFS_EXEC: 3893 case PRIV_VFS_LOOKUP: 3894 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3895 case PRIV_VFS_CHFLAGS_DEV: 3896 case PRIV_VFS_CHOWN: 3897 case PRIV_VFS_CHROOT: 3898 case PRIV_VFS_RETAINSUGID: 3899 case PRIV_VFS_FCHROOT: 3900 case PRIV_VFS_LINK: 3901 case PRIV_VFS_SETGID: 3902 case PRIV_VFS_STAT: 3903 case PRIV_VFS_STICKYFILE: 3904 return (0); 3905 3906 /* 3907 * Depending on the global setting, allow privilege of 3908 * setting system flags. 3909 */ 3910 case PRIV_VFS_SYSFLAGS: 3911 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3912 return (0); 3913 else 3914 return (EPERM); 3915 3916 /* 3917 * Depending on the global setting, allow privilege of 3918 * mounting/unmounting file systems. 3919 */ 3920 case PRIV_VFS_MOUNT: 3921 case PRIV_VFS_UNMOUNT: 3922 case PRIV_VFS_MOUNT_NONUSER: 3923 case PRIV_VFS_MOUNT_OWNER: 3924 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3925 cred->cr_prison->pr_enforce_statfs < 2) 3926 return (0); 3927 else 3928 return (EPERM); 3929 3930 /* 3931 * Allow jailed root to bind reserved ports and reuse in-use 3932 * ports. 3933 */ 3934 case PRIV_NETINET_RESERVEDPORT: 3935 case PRIV_NETINET_REUSEPORT: 3936 return (0); 3937 3938 /* 3939 * Allow jailed root to set certian IPv4/6 (option) headers. 3940 */ 3941 case PRIV_NETINET_SETHDROPTS: 3942 return (0); 3943 3944 /* 3945 * Conditionally allow creating raw sockets in jail. 3946 */ 3947 case PRIV_NETINET_RAW: 3948 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3949 return (0); 3950 else 3951 return (EPERM); 3952 3953 /* 3954 * Since jail implements its own visibility limits on netstat 3955 * sysctls, allow getcred. This allows identd to work in 3956 * jail. 3957 */ 3958 case PRIV_NETINET_GETCRED: 3959 return (0); 3960 3961 /* 3962 * Allow jailed root to set loginclass. 3963 */ 3964 case PRIV_PROC_SETLOGINCLASS: 3965 return (0); 3966 3967 default: 3968 /* 3969 * In all remaining cases, deny the privilege request. This 3970 * includes almost all network privileges, many system 3971 * configuration privileges. 3972 */ 3973 return (EPERM); 3974 } 3975 } 3976 3977 /* 3978 * Return the part of pr2's name that is relative to pr1, or the whole name 3979 * if it does not directly follow. 3980 */ 3981 3982 char * 3983 prison_name(struct prison *pr1, struct prison *pr2) 3984 { 3985 char *name; 3986 3987 /* Jails see themselves as "" (if they see themselves at all). */ 3988 if (pr1 == pr2) 3989 return ""; 3990 name = pr2->pr_name; 3991 if (prison_ischild(pr1, pr2)) { 3992 /* 3993 * pr1 isn't locked (and allprison_lock may not be either) 3994 * so its length can't be counted on. But the number of dots 3995 * can be counted on - and counted. 3996 */ 3997 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3998 name = strchr(name, '.') + 1; 3999 } 4000 return (name); 4001 } 4002 4003 /* 4004 * Return the part of pr2's path that is relative to pr1, or the whole path 4005 * if it does not directly follow. 4006 */ 4007 static char * 4008 prison_path(struct prison *pr1, struct prison *pr2) 4009 { 4010 char *path1, *path2; 4011 int len1; 4012 4013 path1 = pr1->pr_path; 4014 path2 = pr2->pr_path; 4015 if (!strcmp(path1, "/")) 4016 return (path2); 4017 len1 = strlen(path1); 4018 if (strncmp(path1, path2, len1)) 4019 return (path2); 4020 if (path2[len1] == '\0') 4021 return "/"; 4022 if (path2[len1] == '/') 4023 return (path2 + len1); 4024 return (path2); 4025 } 4026 4027 4028 /* 4029 * Jail-related sysctls. 4030 */ 4031 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 4032 "Jails"); 4033 4034 static int 4035 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4036 { 4037 struct xprison *xp; 4038 struct prison *pr, *cpr; 4039 #ifdef INET 4040 struct in_addr *ip4 = NULL; 4041 int ip4s = 0; 4042 #endif 4043 #ifdef INET6 4044 struct in6_addr *ip6 = NULL; 4045 int ip6s = 0; 4046 #endif 4047 int descend, error; 4048 4049 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4050 pr = req->td->td_ucred->cr_prison; 4051 error = 0; 4052 sx_slock(&allprison_lock); 4053 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4054 #if defined(INET) || defined(INET6) 4055 again: 4056 #endif 4057 mtx_lock(&cpr->pr_mtx); 4058 #ifdef INET 4059 if (cpr->pr_ip4s > 0) { 4060 if (ip4s < cpr->pr_ip4s) { 4061 ip4s = cpr->pr_ip4s; 4062 mtx_unlock(&cpr->pr_mtx); 4063 ip4 = realloc(ip4, ip4s * 4064 sizeof(struct in_addr), M_TEMP, M_WAITOK); 4065 goto again; 4066 } 4067 bcopy(cpr->pr_ip4, ip4, 4068 cpr->pr_ip4s * sizeof(struct in_addr)); 4069 } 4070 #endif 4071 #ifdef INET6 4072 if (cpr->pr_ip6s > 0) { 4073 if (ip6s < cpr->pr_ip6s) { 4074 ip6s = cpr->pr_ip6s; 4075 mtx_unlock(&cpr->pr_mtx); 4076 ip6 = realloc(ip6, ip6s * 4077 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 4078 goto again; 4079 } 4080 bcopy(cpr->pr_ip6, ip6, 4081 cpr->pr_ip6s * sizeof(struct in6_addr)); 4082 } 4083 #endif 4084 if (cpr->pr_ref == 0) { 4085 mtx_unlock(&cpr->pr_mtx); 4086 continue; 4087 } 4088 bzero(xp, sizeof(*xp)); 4089 xp->pr_version = XPRISON_VERSION; 4090 xp->pr_id = cpr->pr_id; 4091 xp->pr_state = cpr->pr_uref > 0 4092 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4093 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4094 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4095 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4096 #ifdef INET 4097 xp->pr_ip4s = cpr->pr_ip4s; 4098 #endif 4099 #ifdef INET6 4100 xp->pr_ip6s = cpr->pr_ip6s; 4101 #endif 4102 mtx_unlock(&cpr->pr_mtx); 4103 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4104 if (error) 4105 break; 4106 #ifdef INET 4107 if (xp->pr_ip4s > 0) { 4108 error = SYSCTL_OUT(req, ip4, 4109 xp->pr_ip4s * sizeof(struct in_addr)); 4110 if (error) 4111 break; 4112 } 4113 #endif 4114 #ifdef INET6 4115 if (xp->pr_ip6s > 0) { 4116 error = SYSCTL_OUT(req, ip6, 4117 xp->pr_ip6s * sizeof(struct in6_addr)); 4118 if (error) 4119 break; 4120 } 4121 #endif 4122 } 4123 sx_sunlock(&allprison_lock); 4124 free(xp, M_TEMP); 4125 #ifdef INET 4126 free(ip4, M_TEMP); 4127 #endif 4128 #ifdef INET6 4129 free(ip6, M_TEMP); 4130 #endif 4131 return (error); 4132 } 4133 4134 SYSCTL_OID(_security_jail, OID_AUTO, list, 4135 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4136 sysctl_jail_list, "S", "List of active jails"); 4137 4138 static int 4139 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4140 { 4141 int error, injail; 4142 4143 injail = jailed(req->td->td_ucred); 4144 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4145 4146 return (error); 4147 } 4148 4149 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4150 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4151 sysctl_jail_jailed, "I", "Process in jail?"); 4152 4153 static int 4154 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4155 { 4156 int error, havevnet; 4157 #ifdef VIMAGE 4158 struct ucred *cred = req->td->td_ucred; 4159 4160 havevnet = jailed(cred) && prison_owns_vnet(cred); 4161 #else 4162 havevnet = 0; 4163 #endif 4164 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4165 4166 return (error); 4167 } 4168 4169 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4170 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4171 sysctl_jail_vnet, "I", "Jail owns VNET?"); 4172 4173 #if defined(INET) || defined(INET6) 4174 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4175 &jail_max_af_ips, 0, 4176 "Number of IP addresses a jail may have at most per address family"); 4177 #endif 4178 4179 /* 4180 * Default parameters for jail(2) compatability. For historical reasons, 4181 * the sysctl names have varying similarity to the parameter names. Prisons 4182 * just see their own parameters, and can't change them. 4183 */ 4184 static int 4185 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4186 { 4187 struct prison *pr; 4188 int allow, error, i; 4189 4190 pr = req->td->td_ucred->cr_prison; 4191 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4192 4193 /* Get the current flag value, and convert it to a boolean. */ 4194 i = (allow & arg2) ? 1 : 0; 4195 if (arg1 != NULL) 4196 i = !i; 4197 error = sysctl_handle_int(oidp, &i, 0, req); 4198 if (error || !req->newptr) 4199 return (error); 4200 i = i ? arg2 : 0; 4201 if (arg1 != NULL) 4202 i ^= arg2; 4203 /* 4204 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4205 * for writing. 4206 */ 4207 mtx_lock(&prison0.pr_mtx); 4208 jail_default_allow = (jail_default_allow & ~arg2) | i; 4209 mtx_unlock(&prison0.pr_mtx); 4210 return (0); 4211 } 4212 4213 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4214 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4215 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4216 "Processes in jail can set their hostnames"); 4217 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4218 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4219 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4220 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 4221 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4222 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4223 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4224 "Processes in jail can use System V IPC primitives"); 4225 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4226 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4227 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4228 "Prison root can create raw sockets"); 4229 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4230 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4231 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4232 "Processes in jail can alter system file flags"); 4233 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4234 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4235 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4236 "Processes in jail can mount/unmount jail-friendly file systems"); 4237 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 4238 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4239 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 4240 "Processes in jail can mount the devfs file system"); 4241 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 4242 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4243 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 4244 "Processes in jail can mount the nullfs file system"); 4245 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 4246 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4247 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 4248 "Processes in jail can mount the procfs file system"); 4249 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 4250 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4251 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 4252 "Processes in jail can mount the zfs file system"); 4253 4254 static int 4255 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4256 { 4257 struct prison *pr; 4258 int level, error; 4259 4260 pr = req->td->td_ucred->cr_prison; 4261 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4262 error = sysctl_handle_int(oidp, &level, 0, req); 4263 if (error || !req->newptr) 4264 return (error); 4265 *(int *)arg1 = level; 4266 return (0); 4267 } 4268 4269 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4270 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4271 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4272 sysctl_jail_default_level, "I", 4273 "Processes in jail cannot see all mounted file systems"); 4274 4275 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4276 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4277 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4278 sysctl_jail_default_level, "I", 4279 "Ruleset for the devfs filesystem in jail"); 4280 4281 /* 4282 * Nodes to describe jail parameters. Maximum length of string parameters 4283 * is returned in the string itself, and the other parameters exist merely 4284 * to make themselves and their types known. 4285 */ 4286 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4287 "Jail parameters"); 4288 4289 int 4290 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4291 { 4292 int i; 4293 long l; 4294 size_t s; 4295 char numbuf[12]; 4296 4297 switch (oidp->oid_kind & CTLTYPE) 4298 { 4299 case CTLTYPE_LONG: 4300 case CTLTYPE_ULONG: 4301 l = 0; 4302 #ifdef SCTL_MASK32 4303 if (!(req->flags & SCTL_MASK32)) 4304 #endif 4305 return (SYSCTL_OUT(req, &l, sizeof(l))); 4306 case CTLTYPE_INT: 4307 case CTLTYPE_UINT: 4308 i = 0; 4309 return (SYSCTL_OUT(req, &i, sizeof(i))); 4310 case CTLTYPE_STRING: 4311 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4312 return 4313 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4314 case CTLTYPE_STRUCT: 4315 s = (size_t)arg2; 4316 return (SYSCTL_OUT(req, &s, sizeof(s))); 4317 } 4318 return (0); 4319 } 4320 4321 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4322 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4323 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4324 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4325 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4326 "I", "Jail secure level"); 4327 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4328 "I", "Jail cannot see all mounted file systems"); 4329 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4330 "I", "Ruleset for in-jail devfs mounts"); 4331 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4332 "B", "Jail persistence"); 4333 #ifdef VIMAGE 4334 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4335 "E,jailsys", "Virtual network stack"); 4336 #endif 4337 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4338 "B", "Jail is in the process of shutting down"); 4339 4340 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4341 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4342 "I", "Current number of child jails"); 4343 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4344 "I", "Maximum number of child jails"); 4345 4346 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4347 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4348 "Jail hostname"); 4349 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4350 "Jail NIS domainname"); 4351 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4352 "Jail host UUID"); 4353 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4354 "LU", "Jail host ID"); 4355 4356 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4357 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4358 4359 #ifdef INET 4360 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4361 "Jail IPv4 address virtualization"); 4362 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4363 "S,in_addr,a", "Jail IPv4 addresses"); 4364 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4365 "B", "Do (not) use IPv4 source address selection rather than the " 4366 "primary jail IPv4 address."); 4367 #endif 4368 #ifdef INET6 4369 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4370 "Jail IPv6 address virtualization"); 4371 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4372 "S,in6_addr,a", "Jail IPv6 addresses"); 4373 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4374 "B", "Do (not) use IPv6 source address selection rather than the " 4375 "primary jail IPv6 address."); 4376 #endif 4377 4378 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4379 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4380 "B", "Jail may set hostname"); 4381 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4382 "B", "Jail may use SYSV IPC"); 4383 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4384 "B", "Jail may create raw sockets"); 4385 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4386 "B", "Jail may alter system file flags"); 4387 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4388 "B", "Jail may set file quotas"); 4389 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4390 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4391 4392 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4393 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4394 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4395 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 4396 "B", "Jail may mount the devfs file system"); 4397 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 4398 "B", "Jail may mount the nullfs file system"); 4399 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 4400 "B", "Jail may mount the procfs file system"); 4401 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 4402 "B", "Jail may mount the zfs file system"); 4403 4404 void 4405 prison_racct_foreach(void (*callback)(struct racct *racct, 4406 void *arg2, void *arg3), void *arg2, void *arg3) 4407 { 4408 struct prison_racct *prr; 4409 4410 sx_slock(&allprison_lock); 4411 LIST_FOREACH(prr, &allprison_racct, prr_next) 4412 (callback)(prr->prr_racct, arg2, arg3); 4413 sx_sunlock(&allprison_lock); 4414 } 4415 4416 static struct prison_racct * 4417 prison_racct_find_locked(const char *name) 4418 { 4419 struct prison_racct *prr; 4420 4421 sx_assert(&allprison_lock, SA_XLOCKED); 4422 4423 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4424 return (NULL); 4425 4426 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4427 if (strcmp(name, prr->prr_name) != 0) 4428 continue; 4429 4430 /* Found prison_racct with a matching name? */ 4431 prison_racct_hold(prr); 4432 return (prr); 4433 } 4434 4435 /* Add new prison_racct. */ 4436 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4437 racct_create(&prr->prr_racct); 4438 4439 strcpy(prr->prr_name, name); 4440 refcount_init(&prr->prr_refcount, 1); 4441 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4442 4443 return (prr); 4444 } 4445 4446 struct prison_racct * 4447 prison_racct_find(const char *name) 4448 { 4449 struct prison_racct *prr; 4450 4451 sx_xlock(&allprison_lock); 4452 prr = prison_racct_find_locked(name); 4453 sx_xunlock(&allprison_lock); 4454 return (prr); 4455 } 4456 4457 void 4458 prison_racct_hold(struct prison_racct *prr) 4459 { 4460 4461 refcount_acquire(&prr->prr_refcount); 4462 } 4463 4464 static void 4465 prison_racct_free_locked(struct prison_racct *prr) 4466 { 4467 4468 sx_assert(&allprison_lock, SA_XLOCKED); 4469 4470 if (refcount_release(&prr->prr_refcount)) { 4471 racct_destroy(&prr->prr_racct); 4472 LIST_REMOVE(prr, prr_next); 4473 free(prr, M_PRISON_RACCT); 4474 } 4475 } 4476 4477 void 4478 prison_racct_free(struct prison_racct *prr) 4479 { 4480 int old; 4481 4482 sx_assert(&allprison_lock, SA_UNLOCKED); 4483 4484 old = prr->prr_refcount; 4485 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4486 return; 4487 4488 sx_xlock(&allprison_lock); 4489 prison_racct_free_locked(prr); 4490 sx_xunlock(&allprison_lock); 4491 } 4492 4493 #ifdef RACCT 4494 static void 4495 prison_racct_attach(struct prison *pr) 4496 { 4497 struct prison_racct *prr; 4498 4499 sx_assert(&allprison_lock, SA_XLOCKED); 4500 4501 prr = prison_racct_find_locked(pr->pr_name); 4502 KASSERT(prr != NULL, ("cannot find prison_racct")); 4503 4504 pr->pr_prison_racct = prr; 4505 } 4506 4507 /* 4508 * Handle jail renaming. From the racct point of view, renaming means 4509 * moving from one prison_racct to another. 4510 */ 4511 static void 4512 prison_racct_modify(struct prison *pr) 4513 { 4514 struct proc *p; 4515 struct ucred *cred; 4516 struct prison_racct *oldprr; 4517 4518 sx_slock(&allproc_lock); 4519 sx_xlock(&allprison_lock); 4520 4521 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4522 sx_xunlock(&allprison_lock); 4523 sx_sunlock(&allproc_lock); 4524 return; 4525 } 4526 4527 oldprr = pr->pr_prison_racct; 4528 pr->pr_prison_racct = NULL; 4529 4530 prison_racct_attach(pr); 4531 4532 /* 4533 * Move resource utilisation records. 4534 */ 4535 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4536 4537 /* 4538 * Force rctl to reattach rules to processes. 4539 */ 4540 FOREACH_PROC_IN_SYSTEM(p) { 4541 PROC_LOCK(p); 4542 cred = crhold(p->p_ucred); 4543 PROC_UNLOCK(p); 4544 racct_proc_ucred_changed(p, cred, cred); 4545 crfree(cred); 4546 } 4547 4548 sx_sunlock(&allproc_lock); 4549 prison_racct_free_locked(oldprr); 4550 sx_xunlock(&allprison_lock); 4551 } 4552 4553 static void 4554 prison_racct_detach(struct prison *pr) 4555 { 4556 4557 sx_assert(&allprison_lock, SA_UNLOCKED); 4558 4559 if (pr->pr_prison_racct == NULL) 4560 return; 4561 prison_racct_free(pr->pr_prison_racct); 4562 pr->pr_prison_racct = NULL; 4563 } 4564 #endif /* RACCT */ 4565 4566 #ifdef DDB 4567 4568 static void 4569 db_show_prison(struct prison *pr) 4570 { 4571 int fi; 4572 #if defined(INET) || defined(INET6) 4573 int ii; 4574 #endif 4575 unsigned jsf; 4576 #ifdef INET6 4577 char ip6buf[INET6_ADDRSTRLEN]; 4578 #endif 4579 4580 db_printf("prison %p:\n", pr); 4581 db_printf(" jid = %d\n", pr->pr_id); 4582 db_printf(" name = %s\n", pr->pr_name); 4583 db_printf(" parent = %p\n", pr->pr_parent); 4584 db_printf(" ref = %d\n", pr->pr_ref); 4585 db_printf(" uref = %d\n", pr->pr_uref); 4586 db_printf(" path = %s\n", pr->pr_path); 4587 db_printf(" cpuset = %d\n", pr->pr_cpuset 4588 ? pr->pr_cpuset->cs_id : -1); 4589 #ifdef VIMAGE 4590 db_printf(" vnet = %p\n", pr->pr_vnet); 4591 #endif 4592 db_printf(" root = %p\n", pr->pr_root); 4593 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4594 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4595 db_printf(" children.max = %d\n", pr->pr_childmax); 4596 db_printf(" children.cur = %d\n", pr->pr_childcount); 4597 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4598 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4599 db_printf(" flags = 0x%x", pr->pr_flags); 4600 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4601 fi++) 4602 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4603 db_printf(" %s", pr_flag_names[fi]); 4604 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4605 fi++) { 4606 jsf = pr->pr_flags & 4607 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4608 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4609 pr_flag_jailsys[fi].disable && 4610 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4611 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4612 : "inherit"); 4613 } 4614 db_printf(" allow = 0x%x", pr->pr_allow); 4615 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4616 fi++) 4617 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4618 db_printf(" %s", pr_allow_names[fi]); 4619 db_printf("\n"); 4620 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4621 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4622 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4623 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4624 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4625 #ifdef INET 4626 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4627 for (ii = 0; ii < pr->pr_ip4s; ii++) 4628 db_printf(" %s %s\n", 4629 ii == 0 ? "ip4.addr =" : " ", 4630 inet_ntoa(pr->pr_ip4[ii])); 4631 #endif 4632 #ifdef INET6 4633 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4634 for (ii = 0; ii < pr->pr_ip6s; ii++) 4635 db_printf(" %s %s\n", 4636 ii == 0 ? "ip6.addr =" : " ", 4637 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4638 #endif 4639 } 4640 4641 DB_SHOW_COMMAND(prison, db_show_prison_command) 4642 { 4643 struct prison *pr; 4644 4645 if (!have_addr) { 4646 /* 4647 * Show all prisons in the list, and prison0 which is not 4648 * listed. 4649 */ 4650 db_show_prison(&prison0); 4651 if (!db_pager_quit) { 4652 TAILQ_FOREACH(pr, &allprison, pr_list) { 4653 db_show_prison(pr); 4654 if (db_pager_quit) 4655 break; 4656 } 4657 } 4658 return; 4659 } 4660 4661 if (addr == 0) 4662 pr = &prison0; 4663 else { 4664 /* Look for a prison with the ID and with references. */ 4665 TAILQ_FOREACH(pr, &allprison, pr_list) 4666 if (pr->pr_id == addr && pr->pr_ref > 0) 4667 break; 4668 if (pr == NULL) 4669 /* Look again, without requiring a reference. */ 4670 TAILQ_FOREACH(pr, &allprison, pr_list) 4671 if (pr->pr_id == addr) 4672 break; 4673 if (pr == NULL) 4674 /* Assume address points to a valid prison. */ 4675 pr = (struct prison *)addr; 4676 } 4677 db_show_prison(pr); 4678 } 4679 4680 #endif /* DDB */
Cache object: c6dd92da32ee0af51ffb80ddcc72d0b3
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