1 /* 2 * NetLabel Kernel API 3 * 4 * This file defines the kernel API for the NetLabel system. The NetLabel 5 * system manages static and dynamic label mappings for network protocols such 6 * as CIPSO and RIPSO. 7 * 8 * Author: Paul Moore <paul.moore@hp.com> 9 * 10 */ 11 12 /* 13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008 14 * 15 * This program is free software; you can redistribute it and/or modify 16 * it under the terms of the GNU General Public License as published by 17 * the Free Software Foundation; either version 2 of the License, or 18 * (at your option) any later version. 19 * 20 * This program is distributed in the hope that it will be useful, 21 * but WITHOUT ANY WARRANTY; without even the implied warranty of 22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 23 * the GNU General Public License for more details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with this program; if not, write to the Free Software 27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 28 * 29 */ 30 31 #include <linux/init.h> 32 #include <linux/types.h> 33 #include <linux/audit.h> 34 #include <linux/in.h> 35 #include <linux/in6.h> 36 #include <net/ip.h> 37 #include <net/ipv6.h> 38 #include <net/netlabel.h> 39 #include <net/cipso_ipv4.h> 40 #include <asm/bug.h> 41 #include <asm/atomic.h> 42 43 #include "netlabel_domainhash.h" 44 #include "netlabel_unlabeled.h" 45 #include "netlabel_cipso_v4.h" 46 #include "netlabel_user.h" 47 #include "netlabel_mgmt.h" 48 #include "netlabel_addrlist.h" 49 50 /* 51 * Configuration Functions 52 */ 53 54 /** 55 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping 56 * @domain: the domain mapping to remove 57 * @family: address family 58 * @addr: IP address 59 * @mask: IP address mask 60 * @audit_info: NetLabel audit information 61 * 62 * Description: 63 * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the 64 * default domain mapping to be removed. Returns zero on success, negative 65 * values on failure. 66 * 67 */ 68 int netlbl_cfg_map_del(const char *domain, 69 u16 family, 70 const void *addr, 71 const void *mask, 72 struct netlbl_audit *audit_info) 73 { 74 if (addr == NULL && mask == NULL) { 75 return netlbl_domhsh_remove(domain, audit_info); 76 } else if (addr != NULL && mask != NULL) { 77 switch (family) { 78 case AF_INET: 79 return netlbl_domhsh_remove_af4(domain, addr, mask, 80 audit_info); 81 default: 82 return -EPFNOSUPPORT; 83 } 84 } else 85 return -EINVAL; 86 } 87 88 /** 89 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping 90 * @domain: the domain mapping to add 91 * @family: address family 92 * @addr: IP address 93 * @mask: IP address mask 94 * @audit_info: NetLabel audit information 95 * 96 * Description: 97 * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL 98 * causes a new default domain mapping to be added. Returns zero on success, 99 * negative values on failure. 100 * 101 */ 102 int netlbl_cfg_unlbl_map_add(const char *domain, 103 u16 family, 104 const void *addr, 105 const void *mask, 106 struct netlbl_audit *audit_info) 107 { 108 int ret_val = -ENOMEM; 109 struct netlbl_dom_map *entry; 110 struct netlbl_domaddr_map *addrmap = NULL; 111 struct netlbl_domaddr4_map *map4 = NULL; 112 struct netlbl_domaddr6_map *map6 = NULL; 113 const struct in_addr *addr4, *mask4; 114 const struct in6_addr *addr6, *mask6; 115 116 entry = kzalloc(sizeof(*entry), GFP_ATOMIC); 117 if (entry == NULL) 118 return -ENOMEM; 119 if (domain != NULL) { 120 entry->domain = kstrdup(domain, GFP_ATOMIC); 121 if (entry->domain == NULL) 122 goto cfg_unlbl_map_add_failure; 123 } 124 125 if (addr == NULL && mask == NULL) 126 entry->type = NETLBL_NLTYPE_UNLABELED; 127 else if (addr != NULL && mask != NULL) { 128 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); 129 if (addrmap == NULL) 130 goto cfg_unlbl_map_add_failure; 131 INIT_LIST_HEAD(&addrmap->list4); 132 INIT_LIST_HEAD(&addrmap->list6); 133 134 switch (family) { 135 case AF_INET: 136 addr4 = addr; 137 mask4 = mask; 138 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC); 139 if (map4 == NULL) 140 goto cfg_unlbl_map_add_failure; 141 map4->type = NETLBL_NLTYPE_UNLABELED; 142 map4->list.addr = addr4->s_addr & mask4->s_addr; 143 map4->list.mask = mask4->s_addr; 144 map4->list.valid = 1; 145 ret_val = netlbl_af4list_add(&map4->list, 146 &addrmap->list4); 147 if (ret_val != 0) 148 goto cfg_unlbl_map_add_failure; 149 break; 150 case AF_INET6: 151 addr6 = addr; 152 mask6 = mask; 153 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC); 154 if (map4 == NULL) 155 goto cfg_unlbl_map_add_failure; 156 map6->type = NETLBL_NLTYPE_UNLABELED; 157 ipv6_addr_copy(&map6->list.addr, addr6); 158 map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0]; 159 map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1]; 160 map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2]; 161 map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3]; 162 ipv6_addr_copy(&map6->list.mask, mask6); 163 map6->list.valid = 1; 164 ret_val = netlbl_af4list_add(&map4->list, 165 &addrmap->list4); 166 if (ret_val != 0) 167 goto cfg_unlbl_map_add_failure; 168 break; 169 default: 170 goto cfg_unlbl_map_add_failure; 171 break; 172 } 173 174 entry->type_def.addrsel = addrmap; 175 entry->type = NETLBL_NLTYPE_ADDRSELECT; 176 } else { 177 ret_val = -EINVAL; 178 goto cfg_unlbl_map_add_failure; 179 } 180 181 ret_val = netlbl_domhsh_add(entry, audit_info); 182 if (ret_val != 0) 183 goto cfg_unlbl_map_add_failure; 184 185 return 0; 186 187 cfg_unlbl_map_add_failure: 188 if (entry != NULL) 189 kfree(entry->domain); 190 kfree(entry); 191 kfree(addrmap); 192 kfree(map4); 193 kfree(map6); 194 return ret_val; 195 } 196 197 198 /** 199 * netlbl_cfg_unlbl_static_add - Adds a new static label 200 * @net: network namespace 201 * @dev_name: interface name 202 * @addr: IP address in network byte order (struct in[6]_addr) 203 * @mask: address mask in network byte order (struct in[6]_addr) 204 * @family: address family 205 * @secid: LSM secid value for the entry 206 * @audit_info: NetLabel audit information 207 * 208 * Description: 209 * Adds a new NetLabel static label to be used when protocol provided labels 210 * are not present on incoming traffic. If @dev_name is NULL then the default 211 * interface will be used. Returns zero on success, negative values on failure. 212 * 213 */ 214 int netlbl_cfg_unlbl_static_add(struct net *net, 215 const char *dev_name, 216 const void *addr, 217 const void *mask, 218 u16 family, 219 u32 secid, 220 struct netlbl_audit *audit_info) 221 { 222 u32 addr_len; 223 224 switch (family) { 225 case AF_INET: 226 addr_len = sizeof(struct in_addr); 227 break; 228 case AF_INET6: 229 addr_len = sizeof(struct in6_addr); 230 break; 231 default: 232 return -EPFNOSUPPORT; 233 } 234 235 return netlbl_unlhsh_add(net, 236 dev_name, addr, mask, addr_len, 237 secid, audit_info); 238 } 239 240 /** 241 * netlbl_cfg_unlbl_static_del - Removes an existing static label 242 * @net: network namespace 243 * @dev_name: interface name 244 * @addr: IP address in network byte order (struct in[6]_addr) 245 * @mask: address mask in network byte order (struct in[6]_addr) 246 * @family: address family 247 * @secid: LSM secid value for the entry 248 * @audit_info: NetLabel audit information 249 * 250 * Description: 251 * Removes an existing NetLabel static label used when protocol provided labels 252 * are not present on incoming traffic. If @dev_name is NULL then the default 253 * interface will be used. Returns zero on success, negative values on failure. 254 * 255 */ 256 int netlbl_cfg_unlbl_static_del(struct net *net, 257 const char *dev_name, 258 const void *addr, 259 const void *mask, 260 u16 family, 261 struct netlbl_audit *audit_info) 262 { 263 u32 addr_len; 264 265 switch (family) { 266 case AF_INET: 267 addr_len = sizeof(struct in_addr); 268 break; 269 case AF_INET6: 270 addr_len = sizeof(struct in6_addr); 271 break; 272 default: 273 return -EPFNOSUPPORT; 274 } 275 276 return netlbl_unlhsh_remove(net, 277 dev_name, addr, mask, addr_len, 278 audit_info); 279 } 280 281 /** 282 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition 283 * @doi_def: CIPSO DOI definition 284 * @audit_info: NetLabel audit information 285 * 286 * Description: 287 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on 288 * success and negative values on failure. 289 * 290 */ 291 int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def, 292 struct netlbl_audit *audit_info) 293 { 294 return cipso_v4_doi_add(doi_def, audit_info); 295 } 296 297 /** 298 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition 299 * @doi: CIPSO DOI 300 * @audit_info: NetLabel audit information 301 * 302 * Description: 303 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on 304 * success and negative values on failure. 305 * 306 */ 307 void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info) 308 { 309 cipso_v4_doi_remove(doi, audit_info); 310 } 311 312 /** 313 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping 314 * @doi: the CIPSO DOI 315 * @domain: the domain mapping to add 316 * @addr: IP address 317 * @mask: IP address mask 318 * @audit_info: NetLabel audit information 319 * 320 * Description: 321 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel 322 * subsystem. A @domain value of NULL adds a new default domain mapping. 323 * Returns zero on success, negative values on failure. 324 * 325 */ 326 int netlbl_cfg_cipsov4_map_add(u32 doi, 327 const char *domain, 328 const struct in_addr *addr, 329 const struct in_addr *mask, 330 struct netlbl_audit *audit_info) 331 { 332 int ret_val = -ENOMEM; 333 struct cipso_v4_doi *doi_def; 334 struct netlbl_dom_map *entry; 335 struct netlbl_domaddr_map *addrmap = NULL; 336 struct netlbl_domaddr4_map *addrinfo = NULL; 337 338 doi_def = cipso_v4_doi_getdef(doi); 339 if (doi_def == NULL) 340 return -ENOENT; 341 342 entry = kzalloc(sizeof(*entry), GFP_ATOMIC); 343 if (entry == NULL) 344 return -ENOMEM; 345 if (domain != NULL) { 346 entry->domain = kstrdup(domain, GFP_ATOMIC); 347 if (entry->domain == NULL) 348 goto cfg_cipsov4_map_add_failure; 349 } 350 351 if (addr == NULL && mask == NULL) { 352 entry->type_def.cipsov4 = doi_def; 353 entry->type = NETLBL_NLTYPE_CIPSOV4; 354 } else if (addr != NULL && mask != NULL) { 355 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); 356 if (addrmap == NULL) 357 goto cfg_cipsov4_map_add_failure; 358 INIT_LIST_HEAD(&addrmap->list4); 359 INIT_LIST_HEAD(&addrmap->list6); 360 361 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC); 362 if (addrinfo == NULL) 363 goto cfg_cipsov4_map_add_failure; 364 addrinfo->type_def.cipsov4 = doi_def; 365 addrinfo->type = NETLBL_NLTYPE_CIPSOV4; 366 addrinfo->list.addr = addr->s_addr & mask->s_addr; 367 addrinfo->list.mask = mask->s_addr; 368 addrinfo->list.valid = 1; 369 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4); 370 if (ret_val != 0) 371 goto cfg_cipsov4_map_add_failure; 372 373 entry->type_def.addrsel = addrmap; 374 entry->type = NETLBL_NLTYPE_ADDRSELECT; 375 } else { 376 ret_val = -EINVAL; 377 goto cfg_cipsov4_map_add_failure; 378 } 379 380 ret_val = netlbl_domhsh_add(entry, audit_info); 381 if (ret_val != 0) 382 goto cfg_cipsov4_map_add_failure; 383 384 return 0; 385 386 cfg_cipsov4_map_add_failure: 387 cipso_v4_doi_putdef(doi_def); 388 if (entry != NULL) 389 kfree(entry->domain); 390 kfree(entry); 391 kfree(addrmap); 392 kfree(addrinfo); 393 return ret_val; 394 } 395 396 /* 397 * Security Attribute Functions 398 */ 399 400 /** 401 * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit 402 * @catmap: the category bitmap 403 * @offset: the offset to start searching at, in bits 404 * 405 * Description: 406 * This function walks a LSM secattr category bitmap starting at @offset and 407 * returns the spot of the first set bit or -ENOENT if no bits are set. 408 * 409 */ 410 int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap, 411 u32 offset) 412 { 413 struct netlbl_lsm_secattr_catmap *iter = catmap; 414 u32 node_idx; 415 u32 node_bit; 416 NETLBL_CATMAP_MAPTYPE bitmap; 417 418 if (offset > iter->startbit) { 419 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { 420 iter = iter->next; 421 if (iter == NULL) 422 return -ENOENT; 423 } 424 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE; 425 node_bit = offset - iter->startbit - 426 (NETLBL_CATMAP_MAPSIZE * node_idx); 427 } else { 428 node_idx = 0; 429 node_bit = 0; 430 } 431 bitmap = iter->bitmap[node_idx] >> node_bit; 432 433 for (;;) { 434 if (bitmap != 0) { 435 while ((bitmap & NETLBL_CATMAP_BIT) == 0) { 436 bitmap >>= 1; 437 node_bit++; 438 } 439 return iter->startbit + 440 (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit; 441 } 442 if (++node_idx >= NETLBL_CATMAP_MAPCNT) { 443 if (iter->next != NULL) { 444 iter = iter->next; 445 node_idx = 0; 446 } else 447 return -ENOENT; 448 } 449 bitmap = iter->bitmap[node_idx]; 450 node_bit = 0; 451 } 452 453 return -ENOENT; 454 } 455 456 /** 457 * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits 458 * @catmap: the category bitmap 459 * @offset: the offset to start searching at, in bits 460 * 461 * Description: 462 * This function walks a LSM secattr category bitmap starting at @offset and 463 * returns the spot of the first cleared bit or -ENOENT if the offset is past 464 * the end of the bitmap. 465 * 466 */ 467 int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap, 468 u32 offset) 469 { 470 struct netlbl_lsm_secattr_catmap *iter = catmap; 471 u32 node_idx; 472 u32 node_bit; 473 NETLBL_CATMAP_MAPTYPE bitmask; 474 NETLBL_CATMAP_MAPTYPE bitmap; 475 476 if (offset > iter->startbit) { 477 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { 478 iter = iter->next; 479 if (iter == NULL) 480 return -ENOENT; 481 } 482 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE; 483 node_bit = offset - iter->startbit - 484 (NETLBL_CATMAP_MAPSIZE * node_idx); 485 } else { 486 node_idx = 0; 487 node_bit = 0; 488 } 489 bitmask = NETLBL_CATMAP_BIT << node_bit; 490 491 for (;;) { 492 bitmap = iter->bitmap[node_idx]; 493 while (bitmask != 0 && (bitmap & bitmask) != 0) { 494 bitmask <<= 1; 495 node_bit++; 496 } 497 498 if (bitmask != 0) 499 return iter->startbit + 500 (NETLBL_CATMAP_MAPSIZE * node_idx) + 501 node_bit - 1; 502 else if (++node_idx >= NETLBL_CATMAP_MAPCNT) { 503 if (iter->next == NULL) 504 return iter->startbit + NETLBL_CATMAP_SIZE - 1; 505 iter = iter->next; 506 node_idx = 0; 507 } 508 bitmask = NETLBL_CATMAP_BIT; 509 node_bit = 0; 510 } 511 512 return -ENOENT; 513 } 514 515 /** 516 * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap 517 * @catmap: the category bitmap 518 * @bit: the bit to set 519 * @flags: memory allocation flags 520 * 521 * Description: 522 * Set the bit specified by @bit in @catmap. Returns zero on success, 523 * negative values on failure. 524 * 525 */ 526 int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap, 527 u32 bit, 528 gfp_t flags) 529 { 530 struct netlbl_lsm_secattr_catmap *iter = catmap; 531 u32 node_bit; 532 u32 node_idx; 533 534 while (iter->next != NULL && 535 bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) 536 iter = iter->next; 537 if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) { 538 iter->next = netlbl_secattr_catmap_alloc(flags); 539 if (iter->next == NULL) 540 return -ENOMEM; 541 iter = iter->next; 542 iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1); 543 } 544 545 /* gcc always rounds to zero when doing integer division */ 546 node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE; 547 node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx); 548 iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit; 549 550 return 0; 551 } 552 553 /** 554 * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap 555 * @catmap: the category bitmap 556 * @start: the starting bit 557 * @end: the last bit in the string 558 * @flags: memory allocation flags 559 * 560 * Description: 561 * Set a range of bits, starting at @start and ending with @end. Returns zero 562 * on success, negative values on failure. 563 * 564 */ 565 int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap, 566 u32 start, 567 u32 end, 568 gfp_t flags) 569 { 570 int ret_val = 0; 571 struct netlbl_lsm_secattr_catmap *iter = catmap; 572 u32 iter_max_spot; 573 u32 spot; 574 575 /* XXX - This could probably be made a bit faster by combining writes 576 * to the catmap instead of setting a single bit each time, but for 577 * right now skipping to the start of the range in the catmap should 578 * be a nice improvement over calling the individual setbit function 579 * repeatedly from a loop. */ 580 581 while (iter->next != NULL && 582 start >= (iter->startbit + NETLBL_CATMAP_SIZE)) 583 iter = iter->next; 584 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE; 585 586 for (spot = start; spot <= end && ret_val == 0; spot++) { 587 if (spot >= iter_max_spot && iter->next != NULL) { 588 iter = iter->next; 589 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE; 590 } 591 ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC); 592 } 593 594 return ret_val; 595 } 596 597 /* 598 * LSM Functions 599 */ 600 601 /** 602 * netlbl_enabled - Determine if the NetLabel subsystem is enabled 603 * 604 * Description: 605 * The LSM can use this function to determine if it should use NetLabel 606 * security attributes in it's enforcement mechanism. Currently, NetLabel is 607 * considered to be enabled when it's configuration contains a valid setup for 608 * at least one labeled protocol (i.e. NetLabel can understand incoming 609 * labeled packets of at least one type); otherwise NetLabel is considered to 610 * be disabled. 611 * 612 */ 613 int netlbl_enabled(void) 614 { 615 /* At some point we probably want to expose this mechanism to the user 616 * as well so that admins can toggle NetLabel regardless of the 617 * configuration */ 618 return (atomic_read(&netlabel_mgmt_protocount) > 0); 619 } 620 621 /** 622 * netlbl_sock_setattr - Label a socket using the correct protocol 623 * @sk: the socket to label 624 * @family: protocol family 625 * @secattr: the security attributes 626 * 627 * Description: 628 * Attach the correct label to the given socket using the security attributes 629 * specified in @secattr. This function requires exclusive access to @sk, 630 * which means it either needs to be in the process of being created or locked. 631 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use 632 * network address selectors (can't blindly label the socket), and negative 633 * values on all other failures. 634 * 635 */ 636 int netlbl_sock_setattr(struct sock *sk, 637 u16 family, 638 const struct netlbl_lsm_secattr *secattr) 639 { 640 int ret_val; 641 struct netlbl_dom_map *dom_entry; 642 643 rcu_read_lock(); 644 dom_entry = netlbl_domhsh_getentry(secattr->domain); 645 if (dom_entry == NULL) { 646 ret_val = -ENOENT; 647 goto socket_setattr_return; 648 } 649 switch (family) { 650 case AF_INET: 651 switch (dom_entry->type) { 652 case NETLBL_NLTYPE_ADDRSELECT: 653 ret_val = -EDESTADDRREQ; 654 break; 655 case NETLBL_NLTYPE_CIPSOV4: 656 ret_val = cipso_v4_sock_setattr(sk, 657 dom_entry->type_def.cipsov4, 658 secattr); 659 break; 660 case NETLBL_NLTYPE_UNLABELED: 661 ret_val = 0; 662 break; 663 default: 664 ret_val = -ENOENT; 665 } 666 break; 667 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 668 case AF_INET6: 669 /* since we don't support any IPv6 labeling protocols right 670 * now we can optimize everything away until we do */ 671 ret_val = 0; 672 break; 673 #endif /* IPv6 */ 674 default: 675 ret_val = -EPROTONOSUPPORT; 676 } 677 678 socket_setattr_return: 679 rcu_read_unlock(); 680 return ret_val; 681 } 682 683 /** 684 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket 685 * @sk: the socket 686 * 687 * Description: 688 * Remove all the NetLabel labeling from @sk. The caller is responsible for 689 * ensuring that @sk is locked. 690 * 691 */ 692 void netlbl_sock_delattr(struct sock *sk) 693 { 694 cipso_v4_sock_delattr(sk); 695 } 696 697 /** 698 * netlbl_sock_getattr - Determine the security attributes of a sock 699 * @sk: the sock 700 * @secattr: the security attributes 701 * 702 * Description: 703 * Examines the given sock to see if any NetLabel style labeling has been 704 * applied to the sock, if so it parses the socket label and returns the 705 * security attributes in @secattr. Returns zero on success, negative values 706 * on failure. 707 * 708 */ 709 int netlbl_sock_getattr(struct sock *sk, 710 struct netlbl_lsm_secattr *secattr) 711 { 712 int ret_val; 713 714 switch (sk->sk_family) { 715 case AF_INET: 716 ret_val = cipso_v4_sock_getattr(sk, secattr); 717 break; 718 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 719 case AF_INET6: 720 ret_val = -ENOMSG; 721 break; 722 #endif /* IPv6 */ 723 default: 724 ret_val = -EPROTONOSUPPORT; 725 } 726 727 return ret_val; 728 } 729 730 /** 731 * netlbl_conn_setattr - Label a connected socket using the correct protocol 732 * @sk: the socket to label 733 * @addr: the destination address 734 * @secattr: the security attributes 735 * 736 * Description: 737 * Attach the correct label to the given connected socket using the security 738 * attributes specified in @secattr. The caller is responsible for ensuring 739 * that @sk is locked. Returns zero on success, negative values on failure. 740 * 741 */ 742 int netlbl_conn_setattr(struct sock *sk, 743 struct sockaddr *addr, 744 const struct netlbl_lsm_secattr *secattr) 745 { 746 int ret_val; 747 struct sockaddr_in *addr4; 748 struct netlbl_domaddr4_map *af4_entry; 749 750 rcu_read_lock(); 751 switch (addr->sa_family) { 752 case AF_INET: 753 addr4 = (struct sockaddr_in *)addr; 754 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain, 755 addr4->sin_addr.s_addr); 756 if (af4_entry == NULL) { 757 ret_val = -ENOENT; 758 goto conn_setattr_return; 759 } 760 switch (af4_entry->type) { 761 case NETLBL_NLTYPE_CIPSOV4: 762 ret_val = cipso_v4_sock_setattr(sk, 763 af4_entry->type_def.cipsov4, 764 secattr); 765 break; 766 case NETLBL_NLTYPE_UNLABELED: 767 /* just delete the protocols we support for right now 768 * but we could remove other protocols if needed */ 769 cipso_v4_sock_delattr(sk); 770 ret_val = 0; 771 break; 772 default: 773 ret_val = -ENOENT; 774 } 775 break; 776 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 777 case AF_INET6: 778 /* since we don't support any IPv6 labeling protocols right 779 * now we can optimize everything away until we do */ 780 ret_val = 0; 781 break; 782 #endif /* IPv6 */ 783 default: 784 ret_val = -EPROTONOSUPPORT; 785 } 786 787 conn_setattr_return: 788 rcu_read_unlock(); 789 return ret_val; 790 } 791 792 /** 793 * netlbl_req_setattr - Label a request socket using the correct protocol 794 * @req: the request socket to label 795 * @secattr: the security attributes 796 * 797 * Description: 798 * Attach the correct label to the given socket using the security attributes 799 * specified in @secattr. Returns zero on success, negative values on failure. 800 * 801 */ 802 int netlbl_req_setattr(struct request_sock *req, 803 const struct netlbl_lsm_secattr *secattr) 804 { 805 int ret_val; 806 struct netlbl_dom_map *dom_entry; 807 struct netlbl_domaddr4_map *af4_entry; 808 u32 proto_type; 809 struct cipso_v4_doi *proto_cv4; 810 811 rcu_read_lock(); 812 dom_entry = netlbl_domhsh_getentry(secattr->domain); 813 if (dom_entry == NULL) { 814 ret_val = -ENOENT; 815 goto req_setattr_return; 816 } 817 switch (req->rsk_ops->family) { 818 case AF_INET: 819 if (dom_entry->type == NETLBL_NLTYPE_ADDRSELECT) { 820 struct inet_request_sock *req_inet = inet_rsk(req); 821 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain, 822 req_inet->rmt_addr); 823 if (af4_entry == NULL) { 824 ret_val = -ENOENT; 825 goto req_setattr_return; 826 } 827 proto_type = af4_entry->type; 828 proto_cv4 = af4_entry->type_def.cipsov4; 829 } else { 830 proto_type = dom_entry->type; 831 proto_cv4 = dom_entry->type_def.cipsov4; 832 } 833 switch (proto_type) { 834 case NETLBL_NLTYPE_CIPSOV4: 835 ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr); 836 break; 837 case NETLBL_NLTYPE_UNLABELED: 838 /* just delete the protocols we support for right now 839 * but we could remove other protocols if needed */ 840 cipso_v4_req_delattr(req); 841 ret_val = 0; 842 break; 843 default: 844 ret_val = -ENOENT; 845 } 846 break; 847 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 848 case AF_INET6: 849 /* since we don't support any IPv6 labeling protocols right 850 * now we can optimize everything away until we do */ 851 ret_val = 0; 852 break; 853 #endif /* IPv6 */ 854 default: 855 ret_val = -EPROTONOSUPPORT; 856 } 857 858 req_setattr_return: 859 rcu_read_unlock(); 860 return ret_val; 861 } 862 863 /** 864 * netlbl_req_delattr - Delete all the NetLabel labels on a socket 865 * @req: the socket 866 * 867 * Description: 868 * Remove all the NetLabel labeling from @req. 869 * 870 */ 871 void netlbl_req_delattr(struct request_sock *req) 872 { 873 cipso_v4_req_delattr(req); 874 } 875 876 /** 877 * netlbl_skbuff_setattr - Label a packet using the correct protocol 878 * @skb: the packet 879 * @family: protocol family 880 * @secattr: the security attributes 881 * 882 * Description: 883 * Attach the correct label to the given packet using the security attributes 884 * specified in @secattr. Returns zero on success, negative values on failure. 885 * 886 */ 887 int netlbl_skbuff_setattr(struct sk_buff *skb, 888 u16 family, 889 const struct netlbl_lsm_secattr *secattr) 890 { 891 int ret_val; 892 struct iphdr *hdr4; 893 struct netlbl_domaddr4_map *af4_entry; 894 895 rcu_read_lock(); 896 switch (family) { 897 case AF_INET: 898 hdr4 = ip_hdr(skb); 899 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain, 900 hdr4->daddr); 901 if (af4_entry == NULL) { 902 ret_val = -ENOENT; 903 goto skbuff_setattr_return; 904 } 905 switch (af4_entry->type) { 906 case NETLBL_NLTYPE_CIPSOV4: 907 ret_val = cipso_v4_skbuff_setattr(skb, 908 af4_entry->type_def.cipsov4, 909 secattr); 910 break; 911 case NETLBL_NLTYPE_UNLABELED: 912 /* just delete the protocols we support for right now 913 * but we could remove other protocols if needed */ 914 ret_val = cipso_v4_skbuff_delattr(skb); 915 break; 916 default: 917 ret_val = -ENOENT; 918 } 919 break; 920 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 921 case AF_INET6: 922 /* since we don't support any IPv6 labeling protocols right 923 * now we can optimize everything away until we do */ 924 ret_val = 0; 925 break; 926 #endif /* IPv6 */ 927 default: 928 ret_val = -EPROTONOSUPPORT; 929 } 930 931 skbuff_setattr_return: 932 rcu_read_unlock(); 933 return ret_val; 934 } 935 936 /** 937 * netlbl_skbuff_getattr - Determine the security attributes of a packet 938 * @skb: the packet 939 * @family: protocol family 940 * @secattr: the security attributes 941 * 942 * Description: 943 * Examines the given packet to see if a recognized form of packet labeling 944 * is present, if so it parses the packet label and returns the security 945 * attributes in @secattr. Returns zero on success, negative values on 946 * failure. 947 * 948 */ 949 int netlbl_skbuff_getattr(const struct sk_buff *skb, 950 u16 family, 951 struct netlbl_lsm_secattr *secattr) 952 { 953 switch (family) { 954 case AF_INET: 955 if (CIPSO_V4_OPTEXIST(skb) && 956 cipso_v4_skbuff_getattr(skb, secattr) == 0) 957 return 0; 958 break; 959 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 960 case AF_INET6: 961 break; 962 #endif /* IPv6 */ 963 } 964 965 return netlbl_unlabel_getattr(skb, family, secattr); 966 } 967 968 /** 969 * netlbl_skbuff_err - Handle a LSM error on a sk_buff 970 * @skb: the packet 971 * @error: the error code 972 * @gateway: true if host is acting as a gateway, false otherwise 973 * 974 * Description: 975 * Deal with a LSM problem when handling the packet in @skb, typically this is 976 * a permission denied problem (-EACCES). The correct action is determined 977 * according to the packet's labeling protocol. 978 * 979 */ 980 void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway) 981 { 982 if (CIPSO_V4_OPTEXIST(skb)) 983 cipso_v4_error(skb, error, gateway); 984 } 985 986 /** 987 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches 988 * 989 * Description: 990 * For all of the NetLabel protocols that support some form of label mapping 991 * cache, invalidate the cache. Returns zero on success, negative values on 992 * error. 993 * 994 */ 995 void netlbl_cache_invalidate(void) 996 { 997 cipso_v4_cache_invalidate(); 998 } 999 1000 /** 1001 * netlbl_cache_add - Add an entry to a NetLabel protocol cache 1002 * @skb: the packet 1003 * @secattr: the packet's security attributes 1004 * 1005 * Description: 1006 * Add the LSM security attributes for the given packet to the underlying 1007 * NetLabel protocol's label mapping cache. Returns zero on success, negative 1008 * values on error. 1009 * 1010 */ 1011 int netlbl_cache_add(const struct sk_buff *skb, 1012 const struct netlbl_lsm_secattr *secattr) 1013 { 1014 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0) 1015 return -ENOMSG; 1016 1017 if (CIPSO_V4_OPTEXIST(skb)) 1018 return cipso_v4_cache_add(skb, secattr); 1019 1020 return -ENOMSG; 1021 } 1022 1023 /* 1024 * Protocol Engine Functions 1025 */ 1026 1027 /** 1028 * netlbl_audit_start - Start an audit message 1029 * @type: audit message type 1030 * @audit_info: NetLabel audit information 1031 * 1032 * Description: 1033 * Start an audit message using the type specified in @type and fill the audit 1034 * message with some fields common to all NetLabel audit messages. This 1035 * function should only be used by protocol engines, not LSMs. Returns a 1036 * pointer to the audit buffer on success, NULL on failure. 1037 * 1038 */ 1039 struct audit_buffer *netlbl_audit_start(int type, 1040 struct netlbl_audit *audit_info) 1041 { 1042 return netlbl_audit_start_common(type, audit_info); 1043 } 1044 1045 /* 1046 * Setup Functions 1047 */ 1048 1049 /** 1050 * netlbl_init - Initialize NetLabel 1051 * 1052 * Description: 1053 * Perform the required NetLabel initialization before first use. 1054 * 1055 */ 1056 static int __init netlbl_init(void) 1057 { 1058 int ret_val; 1059 1060 printk(KERN_INFO "NetLabel: Initializing\n"); 1061 printk(KERN_INFO "NetLabel: domain hash size = %u\n", 1062 (1 << NETLBL_DOMHSH_BITSIZE)); 1063 printk(KERN_INFO "NetLabel: protocols =" 1064 " UNLABELED" 1065 " CIPSOv4" 1066 "\n"); 1067 1068 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE); 1069 if (ret_val != 0) 1070 goto init_failure; 1071 1072 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE); 1073 if (ret_val != 0) 1074 goto init_failure; 1075 1076 ret_val = netlbl_netlink_init(); 1077 if (ret_val != 0) 1078 goto init_failure; 1079 1080 ret_val = netlbl_unlabel_defconf(); 1081 if (ret_val != 0) 1082 goto init_failure; 1083 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n"); 1084 1085 return 0; 1086 1087 init_failure: 1088 panic("NetLabel: failed to initialize properly (%d)\n", ret_val); 1089 } 1090 1091 subsys_initcall(netlbl_init); 1092