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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/slab.h> |
34 | #include <linux/audit.h> |
35 | #include <linux/in.h> |
36 | #include <linux/in6.h> |
37 | #include <net/ip.h> |
38 | #include <net/ipv6.h> |
39 | #include <net/netlabel.h> |
40 | #include <net/cipso_ipv4.h> |
41 | #include <asm/bug.h> |
42 | #include <asm/atomic.h> |
43 | |
44 | #include "netlabel_domainhash.h" |
45 | #include "netlabel_unlabeled.h" |
46 | #include "netlabel_cipso_v4.h" |
47 | #include "netlabel_user.h" |
48 | #include "netlabel_mgmt.h" |
49 | #include "netlabel_addrlist.h" |
50 | |
51 | /* |
52 | * Configuration Functions |
53 | */ |
54 | |
55 | /** |
56 | * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping |
57 | * @domain: the domain mapping to remove |
58 | * @family: address family |
59 | * @addr: IP address |
60 | * @mask: IP address mask |
61 | * @audit_info: NetLabel audit information |
62 | * |
63 | * Description: |
64 | * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the |
65 | * default domain mapping to be removed. Returns zero on success, negative |
66 | * values on failure. |
67 | * |
68 | */ |
69 | int netlbl_cfg_map_del(const char *domain, |
70 | u16 family, |
71 | const void *addr, |
72 | const void *mask, |
73 | struct netlbl_audit *audit_info) |
74 | { |
75 | if (addr == NULL && mask == NULL) { |
76 | return netlbl_domhsh_remove(domain, audit_info); |
77 | } else if (addr != NULL && mask != NULL) { |
78 | switch (family) { |
79 | case AF_INET: |
80 | return netlbl_domhsh_remove_af4(domain, addr, mask, |
81 | audit_info); |
82 | default: |
83 | return -EPFNOSUPPORT; |
84 | } |
85 | } else |
86 | return -EINVAL; |
87 | } |
88 | |
89 | /** |
90 | * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping |
91 | * @domain: the domain mapping to add |
92 | * @family: address family |
93 | * @addr: IP address |
94 | * @mask: IP address mask |
95 | * @audit_info: NetLabel audit information |
96 | * |
97 | * Description: |
98 | * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL |
99 | * causes a new default domain mapping to be added. Returns zero on success, |
100 | * negative values on failure. |
101 | * |
102 | */ |
103 | int netlbl_cfg_unlbl_map_add(const char *domain, |
104 | u16 family, |
105 | const void *addr, |
106 | const void *mask, |
107 | struct netlbl_audit *audit_info) |
108 | { |
109 | int ret_val = -ENOMEM; |
110 | struct netlbl_dom_map *entry; |
111 | struct netlbl_domaddr_map *addrmap = NULL; |
112 | struct netlbl_domaddr4_map *map4 = NULL; |
113 | struct netlbl_domaddr6_map *map6 = NULL; |
114 | const struct in_addr *addr4, *mask4; |
115 | const struct in6_addr *addr6, *mask6; |
116 | |
117 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
118 | if (entry == NULL) |
119 | return -ENOMEM; |
120 | if (domain != NULL) { |
121 | entry->domain = kstrdup(domain, GFP_ATOMIC); |
122 | if (entry->domain == NULL) |
123 | goto cfg_unlbl_map_add_failure; |
124 | } |
125 | |
126 | if (addr == NULL && mask == NULL) |
127 | entry->type = NETLBL_NLTYPE_UNLABELED; |
128 | else if (addr != NULL && mask != NULL) { |
129 | addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); |
130 | if (addrmap == NULL) |
131 | goto cfg_unlbl_map_add_failure; |
132 | INIT_LIST_HEAD(&addrmap->list4); |
133 | INIT_LIST_HEAD(&addrmap->list6); |
134 | |
135 | switch (family) { |
136 | case AF_INET: |
137 | addr4 = addr; |
138 | mask4 = mask; |
139 | map4 = kzalloc(sizeof(*map4), GFP_ATOMIC); |
140 | if (map4 == NULL) |
141 | goto cfg_unlbl_map_add_failure; |
142 | map4->type = NETLBL_NLTYPE_UNLABELED; |
143 | map4->list.addr = addr4->s_addr & mask4->s_addr; |
144 | map4->list.mask = mask4->s_addr; |
145 | map4->list.valid = 1; |
146 | ret_val = netlbl_af4list_add(&map4->list, |
147 | &addrmap->list4); |
148 | if (ret_val != 0) |
149 | goto cfg_unlbl_map_add_failure; |
150 | break; |
151 | case AF_INET6: |
152 | addr6 = addr; |
153 | mask6 = mask; |
154 | map6 = kzalloc(sizeof(*map6), GFP_ATOMIC); |
155 | if (map6 == NULL) |
156 | goto cfg_unlbl_map_add_failure; |
157 | map6->type = NETLBL_NLTYPE_UNLABELED; |
158 | ipv6_addr_copy(&map6->list.addr, addr6); |
159 | map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0]; |
160 | map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1]; |
161 | map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2]; |
162 | map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3]; |
163 | ipv6_addr_copy(&map6->list.mask, mask6); |
164 | map6->list.valid = 1; |
165 | ret_val = netlbl_af4list_add(&map4->list, |
166 | &addrmap->list4); |
167 | if (ret_val != 0) |
168 | goto cfg_unlbl_map_add_failure; |
169 | break; |
170 | default: |
171 | goto cfg_unlbl_map_add_failure; |
172 | break; |
173 | } |
174 | |
175 | entry->type_def.addrsel = addrmap; |
176 | entry->type = NETLBL_NLTYPE_ADDRSELECT; |
177 | } else { |
178 | ret_val = -EINVAL; |
179 | goto cfg_unlbl_map_add_failure; |
180 | } |
181 | |
182 | ret_val = netlbl_domhsh_add(entry, audit_info); |
183 | if (ret_val != 0) |
184 | goto cfg_unlbl_map_add_failure; |
185 | |
186 | return 0; |
187 | |
188 | cfg_unlbl_map_add_failure: |
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 | kfree(entry->domain); |
389 | kfree(entry); |
390 | kfree(addrmap); |
391 | kfree(addrinfo); |
392 | return ret_val; |
393 | } |
394 | |
395 | /* |
396 | * Security Attribute Functions |
397 | */ |
398 | |
399 | /** |
400 | * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit |
401 | * @catmap: the category bitmap |
402 | * @offset: the offset to start searching at, in bits |
403 | * |
404 | * Description: |
405 | * This function walks a LSM secattr category bitmap starting at @offset and |
406 | * returns the spot of the first set bit or -ENOENT if no bits are set. |
407 | * |
408 | */ |
409 | int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap, |
410 | u32 offset) |
411 | { |
412 | struct netlbl_lsm_secattr_catmap *iter = catmap; |
413 | u32 node_idx; |
414 | u32 node_bit; |
415 | NETLBL_CATMAP_MAPTYPE bitmap; |
416 | |
417 | if (offset > iter->startbit) { |
418 | while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { |
419 | iter = iter->next; |
420 | if (iter == NULL) |
421 | return -ENOENT; |
422 | } |
423 | node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE; |
424 | node_bit = offset - iter->startbit - |
425 | (NETLBL_CATMAP_MAPSIZE * node_idx); |
426 | } else { |
427 | node_idx = 0; |
428 | node_bit = 0; |
429 | } |
430 | bitmap = iter->bitmap[node_idx] >> node_bit; |
431 | |
432 | for (;;) { |
433 | if (bitmap != 0) { |
434 | while ((bitmap & NETLBL_CATMAP_BIT) == 0) { |
435 | bitmap >>= 1; |
436 | node_bit++; |
437 | } |
438 | return iter->startbit + |
439 | (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit; |
440 | } |
441 | if (++node_idx >= NETLBL_CATMAP_MAPCNT) { |
442 | if (iter->next != NULL) { |
443 | iter = iter->next; |
444 | node_idx = 0; |
445 | } else |
446 | return -ENOENT; |
447 | } |
448 | bitmap = iter->bitmap[node_idx]; |
449 | node_bit = 0; |
450 | } |
451 | |
452 | return -ENOENT; |
453 | } |
454 | |
455 | /** |
456 | * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits |
457 | * @catmap: the category bitmap |
458 | * @offset: the offset to start searching at, in bits |
459 | * |
460 | * Description: |
461 | * This function walks a LSM secattr category bitmap starting at @offset and |
462 | * returns the spot of the first cleared bit or -ENOENT if the offset is past |
463 | * the end of the bitmap. |
464 | * |
465 | */ |
466 | int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap, |
467 | u32 offset) |
468 | { |
469 | struct netlbl_lsm_secattr_catmap *iter = catmap; |
470 | u32 node_idx; |
471 | u32 node_bit; |
472 | NETLBL_CATMAP_MAPTYPE bitmask; |
473 | NETLBL_CATMAP_MAPTYPE bitmap; |
474 | |
475 | if (offset > iter->startbit) { |
476 | while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { |
477 | iter = iter->next; |
478 | if (iter == NULL) |
479 | return -ENOENT; |
480 | } |
481 | node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE; |
482 | node_bit = offset - iter->startbit - |
483 | (NETLBL_CATMAP_MAPSIZE * node_idx); |
484 | } else { |
485 | node_idx = 0; |
486 | node_bit = 0; |
487 | } |
488 | bitmask = NETLBL_CATMAP_BIT << node_bit; |
489 | |
490 | for (;;) { |
491 | bitmap = iter->bitmap[node_idx]; |
492 | while (bitmask != 0 && (bitmap & bitmask) != 0) { |
493 | bitmask <<= 1; |
494 | node_bit++; |
495 | } |
496 | |
497 | if (bitmask != 0) |
498 | return iter->startbit + |
499 | (NETLBL_CATMAP_MAPSIZE * node_idx) + |
500 | node_bit - 1; |
501 | else if (++node_idx >= NETLBL_CATMAP_MAPCNT) { |
502 | if (iter->next == NULL) |
503 | return iter->startbit + NETLBL_CATMAP_SIZE - 1; |
504 | iter = iter->next; |
505 | node_idx = 0; |
506 | } |
507 | bitmask = NETLBL_CATMAP_BIT; |
508 | node_bit = 0; |
509 | } |
510 | |
511 | return -ENOENT; |
512 | } |
513 | |
514 | /** |
515 | * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap |
516 | * @catmap: the category bitmap |
517 | * @bit: the bit to set |
518 | * @flags: memory allocation flags |
519 | * |
520 | * Description: |
521 | * Set the bit specified by @bit in @catmap. Returns zero on success, |
522 | * negative values on failure. |
523 | * |
524 | */ |
525 | int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap, |
526 | u32 bit, |
527 | gfp_t flags) |
528 | { |
529 | struct netlbl_lsm_secattr_catmap *iter = catmap; |
530 | u32 node_bit; |
531 | u32 node_idx; |
532 | |
533 | while (iter->next != NULL && |
534 | bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) |
535 | iter = iter->next; |
536 | if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) { |
537 | iter->next = netlbl_secattr_catmap_alloc(flags); |
538 | if (iter->next == NULL) |
539 | return -ENOMEM; |
540 | iter = iter->next; |
541 | iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1); |
542 | } |
543 | |
544 | /* gcc always rounds to zero when doing integer division */ |
545 | node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE; |
546 | node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx); |
547 | iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit; |
548 | |
549 | return 0; |
550 | } |
551 | |
552 | /** |
553 | * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap |
554 | * @catmap: the category bitmap |
555 | * @start: the starting bit |
556 | * @end: the last bit in the string |
557 | * @flags: memory allocation flags |
558 | * |
559 | * Description: |
560 | * Set a range of bits, starting at @start and ending with @end. Returns zero |
561 | * on success, negative values on failure. |
562 | * |
563 | */ |
564 | int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap, |
565 | u32 start, |
566 | u32 end, |
567 | gfp_t flags) |
568 | { |
569 | int ret_val = 0; |
570 | struct netlbl_lsm_secattr_catmap *iter = catmap; |
571 | u32 iter_max_spot; |
572 | u32 spot; |
573 | |
574 | /* XXX - This could probably be made a bit faster by combining writes |
575 | * to the catmap instead of setting a single bit each time, but for |
576 | * right now skipping to the start of the range in the catmap should |
577 | * be a nice improvement over calling the individual setbit function |
578 | * repeatedly from a loop. */ |
579 | |
580 | while (iter->next != NULL && |
581 | start >= (iter->startbit + NETLBL_CATMAP_SIZE)) |
582 | iter = iter->next; |
583 | iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE; |
584 | |
585 | for (spot = start; spot <= end && ret_val == 0; spot++) { |
586 | if (spot >= iter_max_spot && iter->next != NULL) { |
587 | iter = iter->next; |
588 | iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE; |
589 | } |
590 | ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC); |
591 | } |
592 | |
593 | return ret_val; |
594 | } |
595 | |
596 | /* |
597 | * LSM Functions |
598 | */ |
599 | |
600 | /** |
601 | * netlbl_enabled - Determine if the NetLabel subsystem is enabled |
602 | * |
603 | * Description: |
604 | * The LSM can use this function to determine if it should use NetLabel |
605 | * security attributes in it's enforcement mechanism. Currently, NetLabel is |
606 | * considered to be enabled when it's configuration contains a valid setup for |
607 | * at least one labeled protocol (i.e. NetLabel can understand incoming |
608 | * labeled packets of at least one type); otherwise NetLabel is considered to |
609 | * be disabled. |
610 | * |
611 | */ |
612 | int netlbl_enabled(void) |
613 | { |
614 | /* At some point we probably want to expose this mechanism to the user |
615 | * as well so that admins can toggle NetLabel regardless of the |
616 | * configuration */ |
617 | return (atomic_read(&netlabel_mgmt_protocount) > 0); |
618 | } |
619 | |
620 | /** |
621 | * netlbl_sock_setattr - Label a socket using the correct protocol |
622 | * @sk: the socket to label |
623 | * @family: protocol family |
624 | * @secattr: the security attributes |
625 | * |
626 | * Description: |
627 | * Attach the correct label to the given socket using the security attributes |
628 | * specified in @secattr. This function requires exclusive access to @sk, |
629 | * which means it either needs to be in the process of being created or locked. |
630 | * Returns zero on success, -EDESTADDRREQ if the domain is configured to use |
631 | * network address selectors (can't blindly label the socket), and negative |
632 | * values on all other failures. |
633 | * |
634 | */ |
635 | int netlbl_sock_setattr(struct sock *sk, |
636 | u16 family, |
637 | const struct netlbl_lsm_secattr *secattr) |
638 | { |
639 | int ret_val; |
640 | struct netlbl_dom_map *dom_entry; |
641 | |
642 | rcu_read_lock(); |
643 | dom_entry = netlbl_domhsh_getentry(secattr->domain); |
644 | if (dom_entry == NULL) { |
645 | ret_val = -ENOENT; |
646 | goto socket_setattr_return; |
647 | } |
648 | switch (family) { |
649 | case AF_INET: |
650 | switch (dom_entry->type) { |
651 | case NETLBL_NLTYPE_ADDRSELECT: |
652 | ret_val = -EDESTADDRREQ; |
653 | break; |
654 | case NETLBL_NLTYPE_CIPSOV4: |
655 | ret_val = cipso_v4_sock_setattr(sk, |
656 | dom_entry->type_def.cipsov4, |
657 | secattr); |
658 | break; |
659 | case NETLBL_NLTYPE_UNLABELED: |
660 | ret_val = 0; |
661 | break; |
662 | default: |
663 | ret_val = -ENOENT; |
664 | } |
665 | break; |
666 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
667 | case AF_INET6: |
668 | /* since we don't support any IPv6 labeling protocols right |
669 | * now we can optimize everything away until we do */ |
670 | ret_val = 0; |
671 | break; |
672 | #endif /* IPv6 */ |
673 | default: |
674 | ret_val = -EPROTONOSUPPORT; |
675 | } |
676 | |
677 | socket_setattr_return: |
678 | rcu_read_unlock(); |
679 | return ret_val; |
680 | } |
681 | |
682 | /** |
683 | * netlbl_sock_delattr - Delete all the NetLabel labels on a socket |
684 | * @sk: the socket |
685 | * |
686 | * Description: |
687 | * Remove all the NetLabel labeling from @sk. The caller is responsible for |
688 | * ensuring that @sk is locked. |
689 | * |
690 | */ |
691 | void netlbl_sock_delattr(struct sock *sk) |
692 | { |
693 | cipso_v4_sock_delattr(sk); |
694 | } |
695 | |
696 | /** |
697 | * netlbl_sock_getattr - Determine the security attributes of a sock |
698 | * @sk: the sock |
699 | * @secattr: the security attributes |
700 | * |
701 | * Description: |
702 | * Examines the given sock to see if any NetLabel style labeling has been |
703 | * applied to the sock, if so it parses the socket label and returns the |
704 | * security attributes in @secattr. Returns zero on success, negative values |
705 | * on failure. |
706 | * |
707 | */ |
708 | int netlbl_sock_getattr(struct sock *sk, |
709 | struct netlbl_lsm_secattr *secattr) |
710 | { |
711 | int ret_val; |
712 | |
713 | switch (sk->sk_family) { |
714 | case AF_INET: |
715 | ret_val = cipso_v4_sock_getattr(sk, secattr); |
716 | break; |
717 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
718 | case AF_INET6: |
719 | ret_val = -ENOMSG; |
720 | break; |
721 | #endif /* IPv6 */ |
722 | default: |
723 | ret_val = -EPROTONOSUPPORT; |
724 | } |
725 | |
726 | return ret_val; |
727 | } |
728 | |
729 | /** |
730 | * netlbl_conn_setattr - Label a connected socket using the correct protocol |
731 | * @sk: the socket to label |
732 | * @addr: the destination address |
733 | * @secattr: the security attributes |
734 | * |
735 | * Description: |
736 | * Attach the correct label to the given connected socket using the security |
737 | * attributes specified in @secattr. The caller is responsible for ensuring |
738 | * that @sk is locked. Returns zero on success, negative values on failure. |
739 | * |
740 | */ |
741 | int netlbl_conn_setattr(struct sock *sk, |
742 | struct sockaddr *addr, |
743 | const struct netlbl_lsm_secattr *secattr) |
744 | { |
745 | int ret_val; |
746 | struct sockaddr_in *addr4; |
747 | struct netlbl_domaddr4_map *af4_entry; |
748 | |
749 | rcu_read_lock(); |
750 | switch (addr->sa_family) { |
751 | case AF_INET: |
752 | addr4 = (struct sockaddr_in *)addr; |
753 | af4_entry = netlbl_domhsh_getentry_af4(secattr->domain, |
754 | addr4->sin_addr.s_addr); |
755 | if (af4_entry == NULL) { |
756 | ret_val = -ENOENT; |
757 | goto conn_setattr_return; |
758 | } |
759 | switch (af4_entry->type) { |
760 | case NETLBL_NLTYPE_CIPSOV4: |
761 | ret_val = cipso_v4_sock_setattr(sk, |
762 | af4_entry->type_def.cipsov4, |
763 | secattr); |
764 | break; |
765 | case NETLBL_NLTYPE_UNLABELED: |
766 | /* just delete the protocols we support for right now |
767 | * but we could remove other protocols if needed */ |
768 | cipso_v4_sock_delattr(sk); |
769 | ret_val = 0; |
770 | break; |
771 | default: |
772 | ret_val = -ENOENT; |
773 | } |
774 | break; |
775 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
776 | case AF_INET6: |
777 | /* since we don't support any IPv6 labeling protocols right |
778 | * now we can optimize everything away until we do */ |
779 | ret_val = 0; |
780 | break; |
781 | #endif /* IPv6 */ |
782 | default: |
783 | ret_val = -EPROTONOSUPPORT; |
784 | } |
785 | |
786 | conn_setattr_return: |
787 | rcu_read_unlock(); |
788 | return ret_val; |
789 | } |
790 | |
791 | /** |
792 | * netlbl_req_setattr - Label a request socket using the correct protocol |
793 | * @req: the request socket to label |
794 | * @secattr: the security attributes |
795 | * |
796 | * Description: |
797 | * Attach the correct label to the given socket using the security attributes |
798 | * specified in @secattr. Returns zero on success, negative values on failure. |
799 | * |
800 | */ |
801 | int netlbl_req_setattr(struct request_sock *req, |
802 | const struct netlbl_lsm_secattr *secattr) |
803 | { |
804 | int ret_val; |
805 | struct netlbl_dom_map *dom_entry; |
806 | struct netlbl_domaddr4_map *af4_entry; |
807 | u32 proto_type; |
808 | struct cipso_v4_doi *proto_cv4; |
809 | |
810 | rcu_read_lock(); |
811 | dom_entry = netlbl_domhsh_getentry(secattr->domain); |
812 | if (dom_entry == NULL) { |
813 | ret_val = -ENOENT; |
814 | goto req_setattr_return; |
815 | } |
816 | switch (req->rsk_ops->family) { |
817 | case AF_INET: |
818 | if (dom_entry->type == NETLBL_NLTYPE_ADDRSELECT) { |
819 | struct inet_request_sock *req_inet = inet_rsk(req); |
820 | af4_entry = netlbl_domhsh_getentry_af4(secattr->domain, |
821 | req_inet->rmt_addr); |
822 | if (af4_entry == NULL) { |
823 | ret_val = -ENOENT; |
824 | goto req_setattr_return; |
825 | } |
826 | proto_type = af4_entry->type; |
827 | proto_cv4 = af4_entry->type_def.cipsov4; |
828 | } else { |
829 | proto_type = dom_entry->type; |
830 | proto_cv4 = dom_entry->type_def.cipsov4; |
831 | } |
832 | switch (proto_type) { |
833 | case NETLBL_NLTYPE_CIPSOV4: |
834 | ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr); |
835 | break; |
836 | case NETLBL_NLTYPE_UNLABELED: |
837 | /* just delete the protocols we support for right now |
838 | * but we could remove other protocols if needed */ |
839 | cipso_v4_req_delattr(req); |
840 | ret_val = 0; |
841 | break; |
842 | default: |
843 | ret_val = -ENOENT; |
844 | } |
845 | break; |
846 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
847 | case AF_INET6: |
848 | /* since we don't support any IPv6 labeling protocols right |
849 | * now we can optimize everything away until we do */ |
850 | ret_val = 0; |
851 | break; |
852 | #endif /* IPv6 */ |
853 | default: |
854 | ret_val = -EPROTONOSUPPORT; |
855 | } |
856 | |
857 | req_setattr_return: |
858 | rcu_read_unlock(); |
859 | return ret_val; |
860 | } |
861 | |
862 | /** |
863 | * netlbl_req_delattr - Delete all the NetLabel labels on a socket |
864 | * @req: the socket |
865 | * |
866 | * Description: |
867 | * Remove all the NetLabel labeling from @req. |
868 | * |
869 | */ |
870 | void netlbl_req_delattr(struct request_sock *req) |
871 | { |
872 | cipso_v4_req_delattr(req); |
873 | } |
874 | |
875 | /** |
876 | * netlbl_skbuff_setattr - Label a packet using the correct protocol |
877 | * @skb: the packet |
878 | * @family: protocol family |
879 | * @secattr: the security attributes |
880 | * |
881 | * Description: |
882 | * Attach the correct label to the given packet using the security attributes |
883 | * specified in @secattr. Returns zero on success, negative values on failure. |
884 | * |
885 | */ |
886 | int netlbl_skbuff_setattr(struct sk_buff *skb, |
887 | u16 family, |
888 | const struct netlbl_lsm_secattr *secattr) |
889 | { |
890 | int ret_val; |
891 | struct iphdr *hdr4; |
892 | struct netlbl_domaddr4_map *af4_entry; |
893 | |
894 | rcu_read_lock(); |
895 | switch (family) { |
896 | case AF_INET: |
897 | hdr4 = ip_hdr(skb); |
898 | af4_entry = netlbl_domhsh_getentry_af4(secattr->domain, |
899 | hdr4->daddr); |
900 | if (af4_entry == NULL) { |
901 | ret_val = -ENOENT; |
902 | goto skbuff_setattr_return; |
903 | } |
904 | switch (af4_entry->type) { |
905 | case NETLBL_NLTYPE_CIPSOV4: |
906 | ret_val = cipso_v4_skbuff_setattr(skb, |
907 | af4_entry->type_def.cipsov4, |
908 | secattr); |
909 | break; |
910 | case NETLBL_NLTYPE_UNLABELED: |
911 | /* just delete the protocols we support for right now |
912 | * but we could remove other protocols if needed */ |
913 | ret_val = cipso_v4_skbuff_delattr(skb); |
914 | break; |
915 | default: |
916 | ret_val = -ENOENT; |
917 | } |
918 | break; |
919 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
920 | case AF_INET6: |
921 | /* since we don't support any IPv6 labeling protocols right |
922 | * now we can optimize everything away until we do */ |
923 | ret_val = 0; |
924 | break; |
925 | #endif /* IPv6 */ |
926 | default: |
927 | ret_val = -EPROTONOSUPPORT; |
928 | } |
929 | |
930 | skbuff_setattr_return: |
931 | rcu_read_unlock(); |
932 | return ret_val; |
933 | } |
934 | |
935 | /** |
936 | * netlbl_skbuff_getattr - Determine the security attributes of a packet |
937 | * @skb: the packet |
938 | * @family: protocol family |
939 | * @secattr: the security attributes |
940 | * |
941 | * Description: |
942 | * Examines the given packet to see if a recognized form of packet labeling |
943 | * is present, if so it parses the packet label and returns the security |
944 | * attributes in @secattr. Returns zero on success, negative values on |
945 | * failure. |
946 | * |
947 | */ |
948 | int netlbl_skbuff_getattr(const struct sk_buff *skb, |
949 | u16 family, |
950 | struct netlbl_lsm_secattr *secattr) |
951 | { |
952 | switch (family) { |
953 | case AF_INET: |
954 | if (CIPSO_V4_OPTEXIST(skb) && |
955 | cipso_v4_skbuff_getattr(skb, secattr) == 0) |
956 | return 0; |
957 | break; |
958 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
959 | case AF_INET6: |
960 | break; |
961 | #endif /* IPv6 */ |
962 | } |
963 | |
964 | return netlbl_unlabel_getattr(skb, family, secattr); |
965 | } |
966 | |
967 | /** |
968 | * netlbl_skbuff_err - Handle a LSM error on a sk_buff |
969 | * @skb: the packet |
970 | * @error: the error code |
971 | * @gateway: true if host is acting as a gateway, false otherwise |
972 | * |
973 | * Description: |
974 | * Deal with a LSM problem when handling the packet in @skb, typically this is |
975 | * a permission denied problem (-EACCES). The correct action is determined |
976 | * according to the packet's labeling protocol. |
977 | * |
978 | */ |
979 | void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway) |
980 | { |
981 | if (CIPSO_V4_OPTEXIST(skb)) |
982 | cipso_v4_error(skb, error, gateway); |
983 | } |
984 | |
985 | /** |
986 | * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches |
987 | * |
988 | * Description: |
989 | * For all of the NetLabel protocols that support some form of label mapping |
990 | * cache, invalidate the cache. Returns zero on success, negative values on |
991 | * error. |
992 | * |
993 | */ |
994 | void netlbl_cache_invalidate(void) |
995 | { |
996 | cipso_v4_cache_invalidate(); |
997 | } |
998 | |
999 | /** |
1000 | * netlbl_cache_add - Add an entry to a NetLabel protocol cache |
1001 | * @skb: the packet |
1002 | * @secattr: the packet's security attributes |
1003 | * |
1004 | * Description: |
1005 | * Add the LSM security attributes for the given packet to the underlying |
1006 | * NetLabel protocol's label mapping cache. Returns zero on success, negative |
1007 | * values on error. |
1008 | * |
1009 | */ |
1010 | int netlbl_cache_add(const struct sk_buff *skb, |
1011 | const struct netlbl_lsm_secattr *secattr) |
1012 | { |
1013 | if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0) |
1014 | return -ENOMSG; |
1015 | |
1016 | if (CIPSO_V4_OPTEXIST(skb)) |
1017 | return cipso_v4_cache_add(skb, secattr); |
1018 | |
1019 | return -ENOMSG; |
1020 | } |
1021 | |
1022 | /* |
1023 | * Protocol Engine Functions |
1024 | */ |
1025 | |
1026 | /** |
1027 | * netlbl_audit_start - Start an audit message |
1028 | * @type: audit message type |
1029 | * @audit_info: NetLabel audit information |
1030 | * |
1031 | * Description: |
1032 | * Start an audit message using the type specified in @type and fill the audit |
1033 | * message with some fields common to all NetLabel audit messages. This |
1034 | * function should only be used by protocol engines, not LSMs. Returns a |
1035 | * pointer to the audit buffer on success, NULL on failure. |
1036 | * |
1037 | */ |
1038 | struct audit_buffer *netlbl_audit_start(int type, |
1039 | struct netlbl_audit *audit_info) |
1040 | { |
1041 | return netlbl_audit_start_common(type, audit_info); |
1042 | } |
1043 | |
1044 | /* |
1045 | * Setup Functions |
1046 | */ |
1047 | |
1048 | /** |
1049 | * netlbl_init - Initialize NetLabel |
1050 | * |
1051 | * Description: |
1052 | * Perform the required NetLabel initialization before first use. |
1053 | * |
1054 | */ |
1055 | static int __init netlbl_init(void) |
1056 | { |
1057 | int ret_val; |
1058 | |
1059 | printk(KERN_INFO "NetLabel: Initializing\n"); |
1060 | printk(KERN_INFO "NetLabel: domain hash size = %u\n", |
1061 | (1 << NETLBL_DOMHSH_BITSIZE)); |
1062 | printk(KERN_INFO "NetLabel: protocols =" |
1063 | " UNLABELED" |
1064 | " CIPSOv4" |
1065 | "\n"); |
1066 | |
1067 | ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE); |
1068 | if (ret_val != 0) |
1069 | goto init_failure; |
1070 | |
1071 | ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE); |
1072 | if (ret_val != 0) |
1073 | goto init_failure; |
1074 | |
1075 | ret_val = netlbl_netlink_init(); |
1076 | if (ret_val != 0) |
1077 | goto init_failure; |
1078 | |
1079 | ret_val = netlbl_unlabel_defconf(); |
1080 | if (ret_val != 0) |
1081 | goto init_failure; |
1082 | printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n"); |
1083 | |
1084 | return 0; |
1085 | |
1086 | init_failure: |
1087 | panic("NetLabel: failed to initialize properly (%d)\n", ret_val); |
1088 | } |
1089 | |
1090 | subsys_initcall(netlbl_init); |
1091 |
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