1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * NetLabel Kernel API |
4 | * |
5 | * This file defines the kernel API for the NetLabel system. The NetLabel |
6 | * system manages static and dynamic label mappings for network protocols such |
7 | * as CIPSO and RIPSO. |
8 | * |
9 | * Author: Paul Moore <paul@paul-moore.com> |
10 | */ |
11 | |
12 | /* |
13 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008 |
14 | */ |
15 | |
16 | #include <linux/init.h> |
17 | #include <linux/types.h> |
18 | #include <linux/slab.h> |
19 | #include <linux/audit.h> |
20 | #include <linux/in.h> |
21 | #include <linux/in6.h> |
22 | #include <net/ip.h> |
23 | #include <net/ipv6.h> |
24 | #include <net/netlabel.h> |
25 | #include <net/cipso_ipv4.h> |
26 | #include <net/calipso.h> |
27 | #include <asm/bug.h> |
28 | #include <linux/atomic.h> |
29 | |
30 | #include "netlabel_domainhash.h" |
31 | #include "netlabel_unlabeled.h" |
32 | #include "netlabel_cipso_v4.h" |
33 | #include "netlabel_calipso.h" |
34 | #include "netlabel_user.h" |
35 | #include "netlabel_mgmt.h" |
36 | #include "netlabel_addrlist.h" |
37 | |
38 | /* |
39 | * Configuration Functions |
40 | */ |
41 | |
42 | /** |
43 | * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping |
44 | * @domain: the domain mapping to remove |
45 | * @family: address family |
46 | * @addr: IP address |
47 | * @mask: IP address mask |
48 | * @audit_info: NetLabel audit information |
49 | * |
50 | * Description: |
51 | * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the |
52 | * default domain mapping to be removed. Returns zero on success, negative |
53 | * values on failure. |
54 | * |
55 | */ |
56 | int netlbl_cfg_map_del(const char *domain, |
57 | u16 family, |
58 | const void *addr, |
59 | const void *mask, |
60 | struct netlbl_audit *audit_info) |
61 | { |
62 | if (addr == NULL && mask == NULL) { |
63 | return netlbl_domhsh_remove(domain, family, audit_info); |
64 | } else if (addr != NULL && mask != NULL) { |
65 | switch (family) { |
66 | case AF_INET: |
67 | return netlbl_domhsh_remove_af4(domain, addr, mask, |
68 | audit_info); |
69 | #if IS_ENABLED(CONFIG_IPV6) |
70 | case AF_INET6: |
71 | return netlbl_domhsh_remove_af6(domain, addr, mask, |
72 | audit_info); |
73 | #endif /* IPv6 */ |
74 | default: |
75 | return -EPFNOSUPPORT; |
76 | } |
77 | } else |
78 | return -EINVAL; |
79 | } |
80 | |
81 | /** |
82 | * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping |
83 | * @domain: the domain mapping to add |
84 | * @family: address family |
85 | * @addr: IP address |
86 | * @mask: IP address mask |
87 | * @audit_info: NetLabel audit information |
88 | * |
89 | * Description: |
90 | * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL |
91 | * causes a new default domain mapping to be added. Returns zero on success, |
92 | * negative values on failure. |
93 | * |
94 | */ |
95 | int netlbl_cfg_unlbl_map_add(const char *domain, |
96 | u16 family, |
97 | const void *addr, |
98 | const void *mask, |
99 | struct netlbl_audit *audit_info) |
100 | { |
101 | int ret_val = -ENOMEM; |
102 | struct netlbl_dom_map *entry; |
103 | struct netlbl_domaddr_map *addrmap = NULL; |
104 | struct netlbl_domaddr4_map *map4 = NULL; |
105 | struct netlbl_domaddr6_map *map6 = NULL; |
106 | |
107 | entry = kzalloc(size: sizeof(*entry), GFP_ATOMIC); |
108 | if (entry == NULL) |
109 | return -ENOMEM; |
110 | if (domain != NULL) { |
111 | entry->domain = kstrdup(s: domain, GFP_ATOMIC); |
112 | if (entry->domain == NULL) |
113 | goto cfg_unlbl_map_add_failure; |
114 | } |
115 | entry->family = family; |
116 | |
117 | if (addr == NULL && mask == NULL) |
118 | entry->def.type = NETLBL_NLTYPE_UNLABELED; |
119 | else if (addr != NULL && mask != NULL) { |
120 | addrmap = kzalloc(size: sizeof(*addrmap), GFP_ATOMIC); |
121 | if (addrmap == NULL) |
122 | goto cfg_unlbl_map_add_failure; |
123 | INIT_LIST_HEAD(list: &addrmap->list4); |
124 | INIT_LIST_HEAD(list: &addrmap->list6); |
125 | |
126 | switch (family) { |
127 | case AF_INET: { |
128 | const struct in_addr *addr4 = addr; |
129 | const struct in_addr *mask4 = mask; |
130 | map4 = kzalloc(size: sizeof(*map4), GFP_ATOMIC); |
131 | if (map4 == NULL) |
132 | goto cfg_unlbl_map_add_failure; |
133 | map4->def.type = NETLBL_NLTYPE_UNLABELED; |
134 | map4->list.addr = addr4->s_addr & mask4->s_addr; |
135 | map4->list.mask = mask4->s_addr; |
136 | map4->list.valid = 1; |
137 | ret_val = netlbl_af4list_add(entry: &map4->list, |
138 | head: &addrmap->list4); |
139 | if (ret_val != 0) |
140 | goto cfg_unlbl_map_add_failure; |
141 | break; |
142 | } |
143 | #if IS_ENABLED(CONFIG_IPV6) |
144 | case AF_INET6: { |
145 | const struct in6_addr *addr6 = addr; |
146 | const struct in6_addr *mask6 = mask; |
147 | map6 = kzalloc(size: sizeof(*map6), GFP_ATOMIC); |
148 | if (map6 == NULL) |
149 | goto cfg_unlbl_map_add_failure; |
150 | map6->def.type = NETLBL_NLTYPE_UNLABELED; |
151 | map6->list.addr = *addr6; |
152 | map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0]; |
153 | map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1]; |
154 | map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2]; |
155 | map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3]; |
156 | map6->list.mask = *mask6; |
157 | map6->list.valid = 1; |
158 | ret_val = netlbl_af6list_add(entry: &map6->list, |
159 | head: &addrmap->list6); |
160 | if (ret_val != 0) |
161 | goto cfg_unlbl_map_add_failure; |
162 | break; |
163 | } |
164 | #endif /* IPv6 */ |
165 | default: |
166 | goto cfg_unlbl_map_add_failure; |
167 | } |
168 | |
169 | entry->def.addrsel = addrmap; |
170 | entry->def.type = NETLBL_NLTYPE_ADDRSELECT; |
171 | } else { |
172 | ret_val = -EINVAL; |
173 | goto cfg_unlbl_map_add_failure; |
174 | } |
175 | |
176 | ret_val = netlbl_domhsh_add(entry, audit_info); |
177 | if (ret_val != 0) |
178 | goto cfg_unlbl_map_add_failure; |
179 | |
180 | return 0; |
181 | |
182 | cfg_unlbl_map_add_failure: |
183 | kfree(objp: entry->domain); |
184 | kfree(objp: entry); |
185 | kfree(objp: addrmap); |
186 | kfree(objp: map4); |
187 | kfree(objp: map6); |
188 | return ret_val; |
189 | } |
190 | |
191 | |
192 | /** |
193 | * netlbl_cfg_unlbl_static_add - Adds a new static label |
194 | * @net: network namespace |
195 | * @dev_name: interface name |
196 | * @addr: IP address in network byte order (struct in[6]_addr) |
197 | * @mask: address mask in network byte order (struct in[6]_addr) |
198 | * @family: address family |
199 | * @secid: LSM secid value for the entry |
200 | * @audit_info: NetLabel audit information |
201 | * |
202 | * Description: |
203 | * Adds a new NetLabel static label to be used when protocol provided labels |
204 | * are not present on incoming traffic. If @dev_name is NULL then the default |
205 | * interface will be used. Returns zero on success, negative values on failure. |
206 | * |
207 | */ |
208 | int netlbl_cfg_unlbl_static_add(struct net *net, |
209 | const char *dev_name, |
210 | const void *addr, |
211 | const void *mask, |
212 | u16 family, |
213 | u32 secid, |
214 | struct netlbl_audit *audit_info) |
215 | { |
216 | u32 addr_len; |
217 | |
218 | switch (family) { |
219 | case AF_INET: |
220 | addr_len = sizeof(struct in_addr); |
221 | break; |
222 | #if IS_ENABLED(CONFIG_IPV6) |
223 | case AF_INET6: |
224 | addr_len = sizeof(struct in6_addr); |
225 | break; |
226 | #endif /* IPv6 */ |
227 | default: |
228 | return -EPFNOSUPPORT; |
229 | } |
230 | |
231 | return netlbl_unlhsh_add(net, |
232 | dev_name, addr, mask, addr_len, |
233 | secid, audit_info); |
234 | } |
235 | |
236 | /** |
237 | * netlbl_cfg_unlbl_static_del - Removes an existing static label |
238 | * @net: network namespace |
239 | * @dev_name: interface name |
240 | * @addr: IP address in network byte order (struct in[6]_addr) |
241 | * @mask: address mask in network byte order (struct in[6]_addr) |
242 | * @family: address family |
243 | * @audit_info: NetLabel audit information |
244 | * |
245 | * Description: |
246 | * Removes an existing NetLabel static label used when protocol provided labels |
247 | * are not present on incoming traffic. If @dev_name is NULL then the default |
248 | * interface will be used. Returns zero on success, negative values on failure. |
249 | * |
250 | */ |
251 | int netlbl_cfg_unlbl_static_del(struct net *net, |
252 | const char *dev_name, |
253 | const void *addr, |
254 | const void *mask, |
255 | u16 family, |
256 | struct netlbl_audit *audit_info) |
257 | { |
258 | u32 addr_len; |
259 | |
260 | switch (family) { |
261 | case AF_INET: |
262 | addr_len = sizeof(struct in_addr); |
263 | break; |
264 | #if IS_ENABLED(CONFIG_IPV6) |
265 | case AF_INET6: |
266 | addr_len = sizeof(struct in6_addr); |
267 | break; |
268 | #endif /* IPv6 */ |
269 | default: |
270 | return -EPFNOSUPPORT; |
271 | } |
272 | |
273 | return netlbl_unlhsh_remove(net, |
274 | dev_name, addr, mask, addr_len, |
275 | audit_info); |
276 | } |
277 | |
278 | /** |
279 | * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition |
280 | * @doi_def: CIPSO DOI definition |
281 | * @audit_info: NetLabel audit information |
282 | * |
283 | * Description: |
284 | * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on |
285 | * success and negative values on failure. |
286 | * |
287 | */ |
288 | int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def, |
289 | struct netlbl_audit *audit_info) |
290 | { |
291 | return cipso_v4_doi_add(doi_def, audit_info); |
292 | } |
293 | |
294 | /** |
295 | * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition |
296 | * @doi: CIPSO DOI |
297 | * @audit_info: NetLabel audit information |
298 | * |
299 | * Description: |
300 | * Remove an existing CIPSO DOI definition matching @doi. Returns zero on |
301 | * success and negative values on failure. |
302 | * |
303 | */ |
304 | void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info) |
305 | { |
306 | cipso_v4_doi_remove(doi, audit_info); |
307 | } |
308 | |
309 | /** |
310 | * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping |
311 | * @doi: the CIPSO DOI |
312 | * @domain: the domain mapping to add |
313 | * @addr: IP address |
314 | * @mask: IP address mask |
315 | * @audit_info: NetLabel audit information |
316 | * |
317 | * Description: |
318 | * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel |
319 | * subsystem. A @domain value of NULL adds a new default domain mapping. |
320 | * Returns zero on success, negative values on failure. |
321 | * |
322 | */ |
323 | int netlbl_cfg_cipsov4_map_add(u32 doi, |
324 | const char *domain, |
325 | const struct in_addr *addr, |
326 | const struct in_addr *mask, |
327 | struct netlbl_audit *audit_info) |
328 | { |
329 | int ret_val = -ENOMEM; |
330 | struct cipso_v4_doi *doi_def; |
331 | struct netlbl_dom_map *entry; |
332 | struct netlbl_domaddr_map *addrmap = NULL; |
333 | struct netlbl_domaddr4_map *addrinfo = NULL; |
334 | |
335 | doi_def = cipso_v4_doi_getdef(doi); |
336 | if (doi_def == NULL) |
337 | return -ENOENT; |
338 | |
339 | entry = kzalloc(size: sizeof(*entry), GFP_ATOMIC); |
340 | if (entry == NULL) |
341 | goto out_entry; |
342 | entry->family = AF_INET; |
343 | if (domain != NULL) { |
344 | entry->domain = kstrdup(s: domain, GFP_ATOMIC); |
345 | if (entry->domain == NULL) |
346 | goto out_domain; |
347 | } |
348 | |
349 | if (addr == NULL && mask == NULL) { |
350 | entry->def.cipso = doi_def; |
351 | entry->def.type = NETLBL_NLTYPE_CIPSOV4; |
352 | } else if (addr != NULL && mask != NULL) { |
353 | addrmap = kzalloc(size: sizeof(*addrmap), GFP_ATOMIC); |
354 | if (addrmap == NULL) |
355 | goto out_addrmap; |
356 | INIT_LIST_HEAD(list: &addrmap->list4); |
357 | INIT_LIST_HEAD(list: &addrmap->list6); |
358 | |
359 | addrinfo = kzalloc(size: sizeof(*addrinfo), GFP_ATOMIC); |
360 | if (addrinfo == NULL) |
361 | goto out_addrinfo; |
362 | addrinfo->def.cipso = doi_def; |
363 | addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4; |
364 | addrinfo->list.addr = addr->s_addr & mask->s_addr; |
365 | addrinfo->list.mask = mask->s_addr; |
366 | addrinfo->list.valid = 1; |
367 | ret_val = netlbl_af4list_add(entry: &addrinfo->list, head: &addrmap->list4); |
368 | if (ret_val != 0) |
369 | goto cfg_cipsov4_map_add_failure; |
370 | |
371 | entry->def.addrsel = addrmap; |
372 | entry->def.type = NETLBL_NLTYPE_ADDRSELECT; |
373 | } else { |
374 | ret_val = -EINVAL; |
375 | goto out_addrmap; |
376 | } |
377 | |
378 | ret_val = netlbl_domhsh_add(entry, audit_info); |
379 | if (ret_val != 0) |
380 | goto cfg_cipsov4_map_add_failure; |
381 | |
382 | return 0; |
383 | |
384 | cfg_cipsov4_map_add_failure: |
385 | kfree(objp: addrinfo); |
386 | out_addrinfo: |
387 | kfree(objp: addrmap); |
388 | out_addrmap: |
389 | kfree(objp: entry->domain); |
390 | out_domain: |
391 | kfree(objp: entry); |
392 | out_entry: |
393 | cipso_v4_doi_putdef(doi_def); |
394 | return ret_val; |
395 | } |
396 | |
397 | /** |
398 | * netlbl_cfg_calipso_add - Add a new CALIPSO DOI definition |
399 | * @doi_def: CALIPSO DOI definition |
400 | * @audit_info: NetLabel audit information |
401 | * |
402 | * Description: |
403 | * Add a new CALIPSO DOI definition as defined by @doi_def. Returns zero on |
404 | * success and negative values on failure. |
405 | * |
406 | */ |
407 | int netlbl_cfg_calipso_add(struct calipso_doi *doi_def, |
408 | struct netlbl_audit *audit_info) |
409 | { |
410 | #if IS_ENABLED(CONFIG_IPV6) |
411 | return calipso_doi_add(doi_def, audit_info); |
412 | #else /* IPv6 */ |
413 | return -ENOSYS; |
414 | #endif /* IPv6 */ |
415 | } |
416 | |
417 | /** |
418 | * netlbl_cfg_calipso_del - Remove an existing CALIPSO DOI definition |
419 | * @doi: CALIPSO DOI |
420 | * @audit_info: NetLabel audit information |
421 | * |
422 | * Description: |
423 | * Remove an existing CALIPSO DOI definition matching @doi. Returns zero on |
424 | * success and negative values on failure. |
425 | * |
426 | */ |
427 | void netlbl_cfg_calipso_del(u32 doi, struct netlbl_audit *audit_info) |
428 | { |
429 | #if IS_ENABLED(CONFIG_IPV6) |
430 | calipso_doi_remove(doi, audit_info); |
431 | #endif /* IPv6 */ |
432 | } |
433 | |
434 | /** |
435 | * netlbl_cfg_calipso_map_add - Add a new CALIPSO DOI mapping |
436 | * @doi: the CALIPSO DOI |
437 | * @domain: the domain mapping to add |
438 | * @addr: IP address |
439 | * @mask: IP address mask |
440 | * @audit_info: NetLabel audit information |
441 | * |
442 | * Description: |
443 | * Add a new NetLabel/LSM domain mapping for the given CALIPSO DOI to the |
444 | * NetLabel subsystem. A @domain value of NULL adds a new default domain |
445 | * mapping. Returns zero on success, negative values on failure. |
446 | * |
447 | */ |
448 | int netlbl_cfg_calipso_map_add(u32 doi, |
449 | const char *domain, |
450 | const struct in6_addr *addr, |
451 | const struct in6_addr *mask, |
452 | struct netlbl_audit *audit_info) |
453 | { |
454 | #if IS_ENABLED(CONFIG_IPV6) |
455 | int ret_val = -ENOMEM; |
456 | struct calipso_doi *doi_def; |
457 | struct netlbl_dom_map *entry; |
458 | struct netlbl_domaddr_map *addrmap = NULL; |
459 | struct netlbl_domaddr6_map *addrinfo = NULL; |
460 | |
461 | doi_def = calipso_doi_getdef(doi); |
462 | if (doi_def == NULL) |
463 | return -ENOENT; |
464 | |
465 | entry = kzalloc(size: sizeof(*entry), GFP_ATOMIC); |
466 | if (entry == NULL) |
467 | goto out_entry; |
468 | entry->family = AF_INET6; |
469 | if (domain != NULL) { |
470 | entry->domain = kstrdup(s: domain, GFP_ATOMIC); |
471 | if (entry->domain == NULL) |
472 | goto out_domain; |
473 | } |
474 | |
475 | if (addr == NULL && mask == NULL) { |
476 | entry->def.calipso = doi_def; |
477 | entry->def.type = NETLBL_NLTYPE_CALIPSO; |
478 | } else if (addr != NULL && mask != NULL) { |
479 | addrmap = kzalloc(size: sizeof(*addrmap), GFP_ATOMIC); |
480 | if (addrmap == NULL) |
481 | goto out_addrmap; |
482 | INIT_LIST_HEAD(list: &addrmap->list4); |
483 | INIT_LIST_HEAD(list: &addrmap->list6); |
484 | |
485 | addrinfo = kzalloc(size: sizeof(*addrinfo), GFP_ATOMIC); |
486 | if (addrinfo == NULL) |
487 | goto out_addrinfo; |
488 | addrinfo->def.calipso = doi_def; |
489 | addrinfo->def.type = NETLBL_NLTYPE_CALIPSO; |
490 | addrinfo->list.addr = *addr; |
491 | addrinfo->list.addr.s6_addr32[0] &= mask->s6_addr32[0]; |
492 | addrinfo->list.addr.s6_addr32[1] &= mask->s6_addr32[1]; |
493 | addrinfo->list.addr.s6_addr32[2] &= mask->s6_addr32[2]; |
494 | addrinfo->list.addr.s6_addr32[3] &= mask->s6_addr32[3]; |
495 | addrinfo->list.mask = *mask; |
496 | addrinfo->list.valid = 1; |
497 | ret_val = netlbl_af6list_add(entry: &addrinfo->list, head: &addrmap->list6); |
498 | if (ret_val != 0) |
499 | goto cfg_calipso_map_add_failure; |
500 | |
501 | entry->def.addrsel = addrmap; |
502 | entry->def.type = NETLBL_NLTYPE_ADDRSELECT; |
503 | } else { |
504 | ret_val = -EINVAL; |
505 | goto out_addrmap; |
506 | } |
507 | |
508 | ret_val = netlbl_domhsh_add(entry, audit_info); |
509 | if (ret_val != 0) |
510 | goto cfg_calipso_map_add_failure; |
511 | |
512 | return 0; |
513 | |
514 | cfg_calipso_map_add_failure: |
515 | kfree(objp: addrinfo); |
516 | out_addrinfo: |
517 | kfree(objp: addrmap); |
518 | out_addrmap: |
519 | kfree(objp: entry->domain); |
520 | out_domain: |
521 | kfree(objp: entry); |
522 | out_entry: |
523 | calipso_doi_putdef(doi_def); |
524 | return ret_val; |
525 | #else /* IPv6 */ |
526 | return -ENOSYS; |
527 | #endif /* IPv6 */ |
528 | } |
529 | |
530 | /* |
531 | * Security Attribute Functions |
532 | */ |
533 | |
534 | #define _CM_F_NONE 0x00000000 |
535 | #define _CM_F_ALLOC 0x00000001 |
536 | #define _CM_F_WALK 0x00000002 |
537 | |
538 | /** |
539 | * _netlbl_catmap_getnode - Get a individual node from a catmap |
540 | * @catmap: pointer to the category bitmap |
541 | * @offset: the requested offset |
542 | * @cm_flags: catmap flags, see _CM_F_* |
543 | * @gfp_flags: memory allocation flags |
544 | * |
545 | * Description: |
546 | * Iterate through the catmap looking for the node associated with @offset. |
547 | * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node, |
548 | * one will be created and inserted into the catmap. If the _CM_F_WALK flag is |
549 | * set in @cm_flags and there is no associated node, the next highest node will |
550 | * be returned. Returns a pointer to the node on success, NULL on failure. |
551 | * |
552 | */ |
553 | static struct netlbl_lsm_catmap *_netlbl_catmap_getnode( |
554 | struct netlbl_lsm_catmap **catmap, |
555 | u32 offset, |
556 | unsigned int cm_flags, |
557 | gfp_t gfp_flags) |
558 | { |
559 | struct netlbl_lsm_catmap *iter = *catmap; |
560 | struct netlbl_lsm_catmap *prev = NULL; |
561 | |
562 | if (iter == NULL) |
563 | goto catmap_getnode_alloc; |
564 | if (offset < iter->startbit) |
565 | goto catmap_getnode_walk; |
566 | while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { |
567 | prev = iter; |
568 | iter = iter->next; |
569 | } |
570 | if (iter == NULL || offset < iter->startbit) |
571 | goto catmap_getnode_walk; |
572 | |
573 | return iter; |
574 | |
575 | catmap_getnode_walk: |
576 | if (cm_flags & _CM_F_WALK) |
577 | return iter; |
578 | catmap_getnode_alloc: |
579 | if (!(cm_flags & _CM_F_ALLOC)) |
580 | return NULL; |
581 | |
582 | iter = netlbl_catmap_alloc(flags: gfp_flags); |
583 | if (iter == NULL) |
584 | return NULL; |
585 | iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1); |
586 | |
587 | if (prev == NULL) { |
588 | iter->next = *catmap; |
589 | *catmap = iter; |
590 | } else { |
591 | iter->next = prev->next; |
592 | prev->next = iter; |
593 | } |
594 | |
595 | return iter; |
596 | } |
597 | |
598 | /** |
599 | * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit |
600 | * @catmap: the category bitmap |
601 | * @offset: the offset to start searching at, in bits |
602 | * |
603 | * Description: |
604 | * This function walks a LSM secattr category bitmap starting at @offset and |
605 | * returns the spot of the first set bit or -ENOENT if no bits are set. |
606 | * |
607 | */ |
608 | int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset) |
609 | { |
610 | struct netlbl_lsm_catmap *iter; |
611 | u32 idx; |
612 | u32 bit; |
613 | NETLBL_CATMAP_MAPTYPE bitmap; |
614 | |
615 | iter = _netlbl_catmap_getnode(catmap: &catmap, offset, _CM_F_WALK, gfp_flags: 0); |
616 | if (iter == NULL) |
617 | return -ENOENT; |
618 | if (offset > iter->startbit) { |
619 | offset -= iter->startbit; |
620 | idx = offset / NETLBL_CATMAP_MAPSIZE; |
621 | bit = offset % NETLBL_CATMAP_MAPSIZE; |
622 | } else { |
623 | idx = 0; |
624 | bit = 0; |
625 | } |
626 | bitmap = iter->bitmap[idx] >> bit; |
627 | |
628 | for (;;) { |
629 | if (bitmap != 0) { |
630 | while ((bitmap & NETLBL_CATMAP_BIT) == 0) { |
631 | bitmap >>= 1; |
632 | bit++; |
633 | } |
634 | return iter->startbit + |
635 | (NETLBL_CATMAP_MAPSIZE * idx) + bit; |
636 | } |
637 | if (++idx >= NETLBL_CATMAP_MAPCNT) { |
638 | if (iter->next != NULL) { |
639 | iter = iter->next; |
640 | idx = 0; |
641 | } else |
642 | return -ENOENT; |
643 | } |
644 | bitmap = iter->bitmap[idx]; |
645 | bit = 0; |
646 | } |
647 | |
648 | return -ENOENT; |
649 | } |
650 | EXPORT_SYMBOL(netlbl_catmap_walk); |
651 | |
652 | /** |
653 | * netlbl_catmap_walkrng - Find the end of a string of set bits |
654 | * @catmap: the category bitmap |
655 | * @offset: the offset to start searching at, in bits |
656 | * |
657 | * Description: |
658 | * This function walks a LSM secattr category bitmap starting at @offset and |
659 | * returns the spot of the first cleared bit or -ENOENT if the offset is past |
660 | * the end of the bitmap. |
661 | * |
662 | */ |
663 | int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset) |
664 | { |
665 | struct netlbl_lsm_catmap *iter; |
666 | struct netlbl_lsm_catmap *prev = NULL; |
667 | u32 idx; |
668 | u32 bit; |
669 | NETLBL_CATMAP_MAPTYPE bitmask; |
670 | NETLBL_CATMAP_MAPTYPE bitmap; |
671 | |
672 | iter = _netlbl_catmap_getnode(catmap: &catmap, offset, _CM_F_WALK, gfp_flags: 0); |
673 | if (iter == NULL) |
674 | return -ENOENT; |
675 | if (offset > iter->startbit) { |
676 | offset -= iter->startbit; |
677 | idx = offset / NETLBL_CATMAP_MAPSIZE; |
678 | bit = offset % NETLBL_CATMAP_MAPSIZE; |
679 | } else { |
680 | idx = 0; |
681 | bit = 0; |
682 | } |
683 | bitmask = NETLBL_CATMAP_BIT << bit; |
684 | |
685 | for (;;) { |
686 | bitmap = iter->bitmap[idx]; |
687 | while (bitmask != 0 && (bitmap & bitmask) != 0) { |
688 | bitmask <<= 1; |
689 | bit++; |
690 | } |
691 | |
692 | if (prev && idx == 0 && bit == 0) |
693 | return prev->startbit + NETLBL_CATMAP_SIZE - 1; |
694 | else if (bitmask != 0) |
695 | return iter->startbit + |
696 | (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1; |
697 | else if (++idx >= NETLBL_CATMAP_MAPCNT) { |
698 | if (iter->next == NULL) |
699 | return iter->startbit + NETLBL_CATMAP_SIZE - 1; |
700 | prev = iter; |
701 | iter = iter->next; |
702 | idx = 0; |
703 | } |
704 | bitmask = NETLBL_CATMAP_BIT; |
705 | bit = 0; |
706 | } |
707 | |
708 | return -ENOENT; |
709 | } |
710 | |
711 | /** |
712 | * netlbl_catmap_getlong - Export an unsigned long bitmap |
713 | * @catmap: pointer to the category bitmap |
714 | * @offset: pointer to the requested offset |
715 | * @bitmap: the exported bitmap |
716 | * |
717 | * Description: |
718 | * Export a bitmap with an offset greater than or equal to @offset and return |
719 | * it in @bitmap. The @offset must be aligned to an unsigned long and will be |
720 | * updated on return if different from what was requested; if the catmap is |
721 | * empty at the requested offset and beyond, the @offset is set to (u32)-1. |
722 | * Returns zero on success, negative values on failure. |
723 | * |
724 | */ |
725 | int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap, |
726 | u32 *offset, |
727 | unsigned long *bitmap) |
728 | { |
729 | struct netlbl_lsm_catmap *iter; |
730 | u32 off = *offset; |
731 | u32 idx; |
732 | |
733 | /* only allow aligned offsets */ |
734 | if ((off & (BITS_PER_LONG - 1)) != 0) |
735 | return -EINVAL; |
736 | |
737 | /* a null catmap is equivalent to an empty one */ |
738 | if (!catmap) { |
739 | *offset = (u32)-1; |
740 | return 0; |
741 | } |
742 | |
743 | if (off < catmap->startbit) { |
744 | off = catmap->startbit; |
745 | *offset = off; |
746 | } |
747 | iter = _netlbl_catmap_getnode(catmap: &catmap, offset: off, _CM_F_WALK, gfp_flags: 0); |
748 | if (iter == NULL) { |
749 | *offset = (u32)-1; |
750 | return 0; |
751 | } |
752 | |
753 | if (off < iter->startbit) { |
754 | *offset = iter->startbit; |
755 | off = 0; |
756 | } else |
757 | off -= iter->startbit; |
758 | idx = off / NETLBL_CATMAP_MAPSIZE; |
759 | *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE); |
760 | |
761 | return 0; |
762 | } |
763 | |
764 | /** |
765 | * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap |
766 | * @catmap: pointer to the category bitmap |
767 | * @bit: the bit to set |
768 | * @flags: memory allocation flags |
769 | * |
770 | * Description: |
771 | * Set the bit specified by @bit in @catmap. Returns zero on success, |
772 | * negative values on failure. |
773 | * |
774 | */ |
775 | int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap, |
776 | u32 bit, |
777 | gfp_t flags) |
778 | { |
779 | struct netlbl_lsm_catmap *iter; |
780 | u32 idx; |
781 | |
782 | iter = _netlbl_catmap_getnode(catmap, offset: bit, _CM_F_ALLOC, gfp_flags: flags); |
783 | if (iter == NULL) |
784 | return -ENOMEM; |
785 | |
786 | bit -= iter->startbit; |
787 | idx = bit / NETLBL_CATMAP_MAPSIZE; |
788 | iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE); |
789 | |
790 | return 0; |
791 | } |
792 | EXPORT_SYMBOL(netlbl_catmap_setbit); |
793 | |
794 | /** |
795 | * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap |
796 | * @catmap: pointer to the category bitmap |
797 | * @start: the starting bit |
798 | * @end: the last bit in the string |
799 | * @flags: memory allocation flags |
800 | * |
801 | * Description: |
802 | * Set a range of bits, starting at @start and ending with @end. Returns zero |
803 | * on success, negative values on failure. |
804 | * |
805 | */ |
806 | int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap, |
807 | u32 start, |
808 | u32 end, |
809 | gfp_t flags) |
810 | { |
811 | int rc = 0; |
812 | u32 spot = start; |
813 | |
814 | while (rc == 0 && spot <= end) { |
815 | if (((spot & (BITS_PER_LONG - 1)) == 0) && |
816 | ((end - spot) > BITS_PER_LONG)) { |
817 | rc = netlbl_catmap_setlong(catmap, |
818 | offset: spot, |
819 | bitmap: (unsigned long)-1, |
820 | flags); |
821 | spot += BITS_PER_LONG; |
822 | } else |
823 | rc = netlbl_catmap_setbit(catmap, spot++, flags); |
824 | } |
825 | |
826 | return rc; |
827 | } |
828 | |
829 | /** |
830 | * netlbl_catmap_setlong - Import an unsigned long bitmap |
831 | * @catmap: pointer to the category bitmap |
832 | * @offset: offset to the start of the imported bitmap |
833 | * @bitmap: the bitmap to import |
834 | * @flags: memory allocation flags |
835 | * |
836 | * Description: |
837 | * Import the bitmap specified in @bitmap into @catmap, using the offset |
838 | * in @offset. The offset must be aligned to an unsigned long. Returns zero |
839 | * on success, negative values on failure. |
840 | * |
841 | */ |
842 | int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap, |
843 | u32 offset, |
844 | unsigned long bitmap, |
845 | gfp_t flags) |
846 | { |
847 | struct netlbl_lsm_catmap *iter; |
848 | u32 idx; |
849 | |
850 | /* only allow aligned offsets */ |
851 | if ((offset & (BITS_PER_LONG - 1)) != 0) |
852 | return -EINVAL; |
853 | |
854 | iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, gfp_flags: flags); |
855 | if (iter == NULL) |
856 | return -ENOMEM; |
857 | |
858 | offset -= iter->startbit; |
859 | idx = offset / NETLBL_CATMAP_MAPSIZE; |
860 | iter->bitmap[idx] |= (NETLBL_CATMAP_MAPTYPE)bitmap |
861 | << (offset % NETLBL_CATMAP_MAPSIZE); |
862 | |
863 | return 0; |
864 | } |
865 | |
866 | /* Bitmap functions |
867 | */ |
868 | |
869 | /** |
870 | * netlbl_bitmap_walk - Walk a bitmap looking for a bit |
871 | * @bitmap: the bitmap |
872 | * @bitmap_len: length in bits |
873 | * @offset: starting offset |
874 | * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit |
875 | * |
876 | * Description: |
877 | * Starting at @offset, walk the bitmap from left to right until either the |
878 | * desired bit is found or we reach the end. Return the bit offset, -1 if |
879 | * not found, or -2 if error. |
880 | */ |
881 | int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len, |
882 | u32 offset, u8 state) |
883 | { |
884 | u32 bit_spot; |
885 | u32 byte_offset; |
886 | unsigned char bitmask; |
887 | unsigned char byte; |
888 | |
889 | if (offset >= bitmap_len) |
890 | return -1; |
891 | byte_offset = offset / 8; |
892 | byte = bitmap[byte_offset]; |
893 | bit_spot = offset; |
894 | bitmask = 0x80 >> (offset % 8); |
895 | |
896 | while (bit_spot < bitmap_len) { |
897 | if ((state && (byte & bitmask) == bitmask) || |
898 | (state == 0 && (byte & bitmask) == 0)) |
899 | return bit_spot; |
900 | |
901 | if (++bit_spot >= bitmap_len) |
902 | return -1; |
903 | bitmask >>= 1; |
904 | if (bitmask == 0) { |
905 | byte = bitmap[++byte_offset]; |
906 | bitmask = 0x80; |
907 | } |
908 | } |
909 | |
910 | return -1; |
911 | } |
912 | EXPORT_SYMBOL(netlbl_bitmap_walk); |
913 | |
914 | /** |
915 | * netlbl_bitmap_setbit - Sets a single bit in a bitmap |
916 | * @bitmap: the bitmap |
917 | * @bit: the bit |
918 | * @state: if non-zero, set the bit (1) else clear the bit (0) |
919 | * |
920 | * Description: |
921 | * Set a single bit in the bitmask. Returns zero on success, negative values |
922 | * on error. |
923 | */ |
924 | void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state) |
925 | { |
926 | u32 byte_spot; |
927 | u8 bitmask; |
928 | |
929 | /* gcc always rounds to zero when doing integer division */ |
930 | byte_spot = bit / 8; |
931 | bitmask = 0x80 >> (bit % 8); |
932 | if (state) |
933 | bitmap[byte_spot] |= bitmask; |
934 | else |
935 | bitmap[byte_spot] &= ~bitmask; |
936 | } |
937 | EXPORT_SYMBOL(netlbl_bitmap_setbit); |
938 | |
939 | /* |
940 | * LSM Functions |
941 | */ |
942 | |
943 | /** |
944 | * netlbl_enabled - Determine if the NetLabel subsystem is enabled |
945 | * |
946 | * Description: |
947 | * The LSM can use this function to determine if it should use NetLabel |
948 | * security attributes in it's enforcement mechanism. Currently, NetLabel is |
949 | * considered to be enabled when it's configuration contains a valid setup for |
950 | * at least one labeled protocol (i.e. NetLabel can understand incoming |
951 | * labeled packets of at least one type); otherwise NetLabel is considered to |
952 | * be disabled. |
953 | * |
954 | */ |
955 | int netlbl_enabled(void) |
956 | { |
957 | /* At some point we probably want to expose this mechanism to the user |
958 | * as well so that admins can toggle NetLabel regardless of the |
959 | * configuration */ |
960 | return (atomic_read(v: &netlabel_mgmt_protocount) > 0); |
961 | } |
962 | |
963 | /** |
964 | * netlbl_sock_setattr - Label a socket using the correct protocol |
965 | * @sk: the socket to label |
966 | * @family: protocol family |
967 | * @secattr: the security attributes |
968 | * |
969 | * Description: |
970 | * Attach the correct label to the given socket using the security attributes |
971 | * specified in @secattr. This function requires exclusive access to @sk, |
972 | * which means it either needs to be in the process of being created or locked. |
973 | * Returns zero on success, -EDESTADDRREQ if the domain is configured to use |
974 | * network address selectors (can't blindly label the socket), and negative |
975 | * values on all other failures. |
976 | * |
977 | */ |
978 | int netlbl_sock_setattr(struct sock *sk, |
979 | u16 family, |
980 | const struct netlbl_lsm_secattr *secattr) |
981 | { |
982 | int ret_val; |
983 | struct netlbl_dom_map *dom_entry; |
984 | |
985 | rcu_read_lock(); |
986 | dom_entry = netlbl_domhsh_getentry(domain: secattr->domain, family); |
987 | if (dom_entry == NULL) { |
988 | ret_val = -ENOENT; |
989 | goto socket_setattr_return; |
990 | } |
991 | switch (family) { |
992 | case AF_INET: |
993 | switch (dom_entry->def.type) { |
994 | case NETLBL_NLTYPE_ADDRSELECT: |
995 | ret_val = -EDESTADDRREQ; |
996 | break; |
997 | case NETLBL_NLTYPE_CIPSOV4: |
998 | ret_val = cipso_v4_sock_setattr(sk, |
999 | doi_def: dom_entry->def.cipso, |
1000 | secattr); |
1001 | break; |
1002 | case NETLBL_NLTYPE_UNLABELED: |
1003 | ret_val = 0; |
1004 | break; |
1005 | default: |
1006 | ret_val = -ENOENT; |
1007 | } |
1008 | break; |
1009 | #if IS_ENABLED(CONFIG_IPV6) |
1010 | case AF_INET6: |
1011 | switch (dom_entry->def.type) { |
1012 | case NETLBL_NLTYPE_ADDRSELECT: |
1013 | ret_val = -EDESTADDRREQ; |
1014 | break; |
1015 | case NETLBL_NLTYPE_CALIPSO: |
1016 | ret_val = calipso_sock_setattr(sk, |
1017 | doi_def: dom_entry->def.calipso, |
1018 | secattr); |
1019 | break; |
1020 | case NETLBL_NLTYPE_UNLABELED: |
1021 | ret_val = 0; |
1022 | break; |
1023 | default: |
1024 | ret_val = -ENOENT; |
1025 | } |
1026 | break; |
1027 | #endif /* IPv6 */ |
1028 | default: |
1029 | ret_val = -EPROTONOSUPPORT; |
1030 | } |
1031 | |
1032 | socket_setattr_return: |
1033 | rcu_read_unlock(); |
1034 | return ret_val; |
1035 | } |
1036 | |
1037 | /** |
1038 | * netlbl_sock_delattr - Delete all the NetLabel labels on a socket |
1039 | * @sk: the socket |
1040 | * |
1041 | * Description: |
1042 | * Remove all the NetLabel labeling from @sk. The caller is responsible for |
1043 | * ensuring that @sk is locked. |
1044 | * |
1045 | */ |
1046 | void netlbl_sock_delattr(struct sock *sk) |
1047 | { |
1048 | switch (sk->sk_family) { |
1049 | case AF_INET: |
1050 | cipso_v4_sock_delattr(sk); |
1051 | break; |
1052 | #if IS_ENABLED(CONFIG_IPV6) |
1053 | case AF_INET6: |
1054 | calipso_sock_delattr(sk); |
1055 | break; |
1056 | #endif /* IPv6 */ |
1057 | } |
1058 | } |
1059 | |
1060 | /** |
1061 | * netlbl_sock_getattr - Determine the security attributes of a sock |
1062 | * @sk: the sock |
1063 | * @secattr: the security attributes |
1064 | * |
1065 | * Description: |
1066 | * Examines the given sock to see if any NetLabel style labeling has been |
1067 | * applied to the sock, if so it parses the socket label and returns the |
1068 | * security attributes in @secattr. Returns zero on success, negative values |
1069 | * on failure. |
1070 | * |
1071 | */ |
1072 | int netlbl_sock_getattr(struct sock *sk, |
1073 | struct netlbl_lsm_secattr *secattr) |
1074 | { |
1075 | int ret_val; |
1076 | |
1077 | switch (sk->sk_family) { |
1078 | case AF_INET: |
1079 | ret_val = cipso_v4_sock_getattr(sk, secattr); |
1080 | break; |
1081 | #if IS_ENABLED(CONFIG_IPV6) |
1082 | case AF_INET6: |
1083 | ret_val = calipso_sock_getattr(sk, secattr); |
1084 | break; |
1085 | #endif /* IPv6 */ |
1086 | default: |
1087 | ret_val = -EPROTONOSUPPORT; |
1088 | } |
1089 | |
1090 | return ret_val; |
1091 | } |
1092 | |
1093 | /** |
1094 | * netlbl_conn_setattr - Label a connected socket using the correct protocol |
1095 | * @sk: the socket to label |
1096 | * @addr: the destination address |
1097 | * @secattr: the security attributes |
1098 | * |
1099 | * Description: |
1100 | * Attach the correct label to the given connected socket using the security |
1101 | * attributes specified in @secattr. The caller is responsible for ensuring |
1102 | * that @sk is locked. Returns zero on success, negative values on failure. |
1103 | * |
1104 | */ |
1105 | int netlbl_conn_setattr(struct sock *sk, |
1106 | struct sockaddr *addr, |
1107 | const struct netlbl_lsm_secattr *secattr) |
1108 | { |
1109 | int ret_val; |
1110 | struct sockaddr_in *addr4; |
1111 | #if IS_ENABLED(CONFIG_IPV6) |
1112 | struct sockaddr_in6 *addr6; |
1113 | #endif |
1114 | struct netlbl_dommap_def *entry; |
1115 | |
1116 | rcu_read_lock(); |
1117 | switch (addr->sa_family) { |
1118 | case AF_INET: |
1119 | addr4 = (struct sockaddr_in *)addr; |
1120 | entry = netlbl_domhsh_getentry_af4(domain: secattr->domain, |
1121 | addr: addr4->sin_addr.s_addr); |
1122 | if (entry == NULL) { |
1123 | ret_val = -ENOENT; |
1124 | goto conn_setattr_return; |
1125 | } |
1126 | switch (entry->type) { |
1127 | case NETLBL_NLTYPE_CIPSOV4: |
1128 | ret_val = cipso_v4_sock_setattr(sk, |
1129 | doi_def: entry->cipso, secattr); |
1130 | break; |
1131 | case NETLBL_NLTYPE_UNLABELED: |
1132 | /* just delete the protocols we support for right now |
1133 | * but we could remove other protocols if needed */ |
1134 | netlbl_sock_delattr(sk); |
1135 | ret_val = 0; |
1136 | break; |
1137 | default: |
1138 | ret_val = -ENOENT; |
1139 | } |
1140 | break; |
1141 | #if IS_ENABLED(CONFIG_IPV6) |
1142 | case AF_INET6: |
1143 | addr6 = (struct sockaddr_in6 *)addr; |
1144 | entry = netlbl_domhsh_getentry_af6(domain: secattr->domain, |
1145 | addr: &addr6->sin6_addr); |
1146 | if (entry == NULL) { |
1147 | ret_val = -ENOENT; |
1148 | goto conn_setattr_return; |
1149 | } |
1150 | switch (entry->type) { |
1151 | case NETLBL_NLTYPE_CALIPSO: |
1152 | ret_val = calipso_sock_setattr(sk, |
1153 | doi_def: entry->calipso, secattr); |
1154 | break; |
1155 | case NETLBL_NLTYPE_UNLABELED: |
1156 | /* just delete the protocols we support for right now |
1157 | * but we could remove other protocols if needed */ |
1158 | netlbl_sock_delattr(sk); |
1159 | ret_val = 0; |
1160 | break; |
1161 | default: |
1162 | ret_val = -ENOENT; |
1163 | } |
1164 | break; |
1165 | #endif /* IPv6 */ |
1166 | default: |
1167 | ret_val = -EPROTONOSUPPORT; |
1168 | } |
1169 | |
1170 | conn_setattr_return: |
1171 | rcu_read_unlock(); |
1172 | return ret_val; |
1173 | } |
1174 | |
1175 | /** |
1176 | * netlbl_req_setattr - Label a request socket using the correct protocol |
1177 | * @req: the request socket to label |
1178 | * @secattr: the security attributes |
1179 | * |
1180 | * Description: |
1181 | * Attach the correct label to the given socket using the security attributes |
1182 | * specified in @secattr. Returns zero on success, negative values on failure. |
1183 | * |
1184 | */ |
1185 | int netlbl_req_setattr(struct request_sock *req, |
1186 | const struct netlbl_lsm_secattr *secattr) |
1187 | { |
1188 | int ret_val; |
1189 | struct netlbl_dommap_def *entry; |
1190 | struct inet_request_sock *ireq = inet_rsk(sk: req); |
1191 | |
1192 | rcu_read_lock(); |
1193 | switch (req->rsk_ops->family) { |
1194 | case AF_INET: |
1195 | entry = netlbl_domhsh_getentry_af4(domain: secattr->domain, |
1196 | addr: ireq->ir_rmt_addr); |
1197 | if (entry == NULL) { |
1198 | ret_val = -ENOENT; |
1199 | goto req_setattr_return; |
1200 | } |
1201 | switch (entry->type) { |
1202 | case NETLBL_NLTYPE_CIPSOV4: |
1203 | ret_val = cipso_v4_req_setattr(req, |
1204 | doi_def: entry->cipso, secattr); |
1205 | break; |
1206 | case NETLBL_NLTYPE_UNLABELED: |
1207 | netlbl_req_delattr(req); |
1208 | ret_val = 0; |
1209 | break; |
1210 | default: |
1211 | ret_val = -ENOENT; |
1212 | } |
1213 | break; |
1214 | #if IS_ENABLED(CONFIG_IPV6) |
1215 | case AF_INET6: |
1216 | entry = netlbl_domhsh_getentry_af6(domain: secattr->domain, |
1217 | addr: &ireq->ir_v6_rmt_addr); |
1218 | if (entry == NULL) { |
1219 | ret_val = -ENOENT; |
1220 | goto req_setattr_return; |
1221 | } |
1222 | switch (entry->type) { |
1223 | case NETLBL_NLTYPE_CALIPSO: |
1224 | ret_val = calipso_req_setattr(req, |
1225 | doi_def: entry->calipso, secattr); |
1226 | break; |
1227 | case NETLBL_NLTYPE_UNLABELED: |
1228 | netlbl_req_delattr(req); |
1229 | ret_val = 0; |
1230 | break; |
1231 | default: |
1232 | ret_val = -ENOENT; |
1233 | } |
1234 | break; |
1235 | #endif /* IPv6 */ |
1236 | default: |
1237 | ret_val = -EPROTONOSUPPORT; |
1238 | } |
1239 | |
1240 | req_setattr_return: |
1241 | rcu_read_unlock(); |
1242 | return ret_val; |
1243 | } |
1244 | |
1245 | /** |
1246 | * netlbl_req_delattr - Delete all the NetLabel labels on a socket |
1247 | * @req: the socket |
1248 | * |
1249 | * Description: |
1250 | * Remove all the NetLabel labeling from @req. |
1251 | * |
1252 | */ |
1253 | void netlbl_req_delattr(struct request_sock *req) |
1254 | { |
1255 | switch (req->rsk_ops->family) { |
1256 | case AF_INET: |
1257 | cipso_v4_req_delattr(req); |
1258 | break; |
1259 | #if IS_ENABLED(CONFIG_IPV6) |
1260 | case AF_INET6: |
1261 | calipso_req_delattr(req); |
1262 | break; |
1263 | #endif /* IPv6 */ |
1264 | } |
1265 | } |
1266 | |
1267 | /** |
1268 | * netlbl_skbuff_setattr - Label a packet using the correct protocol |
1269 | * @skb: the packet |
1270 | * @family: protocol family |
1271 | * @secattr: the security attributes |
1272 | * |
1273 | * Description: |
1274 | * Attach the correct label to the given packet using the security attributes |
1275 | * specified in @secattr. Returns zero on success, negative values on failure. |
1276 | * |
1277 | */ |
1278 | int netlbl_skbuff_setattr(struct sk_buff *skb, |
1279 | u16 family, |
1280 | const struct netlbl_lsm_secattr *secattr) |
1281 | { |
1282 | int ret_val; |
1283 | struct iphdr *hdr4; |
1284 | #if IS_ENABLED(CONFIG_IPV6) |
1285 | struct ipv6hdr *hdr6; |
1286 | #endif |
1287 | struct netlbl_dommap_def *entry; |
1288 | |
1289 | rcu_read_lock(); |
1290 | switch (family) { |
1291 | case AF_INET: |
1292 | hdr4 = ip_hdr(skb); |
1293 | entry = netlbl_domhsh_getentry_af4(domain: secattr->domain, |
1294 | addr: hdr4->daddr); |
1295 | if (entry == NULL) { |
1296 | ret_val = -ENOENT; |
1297 | goto skbuff_setattr_return; |
1298 | } |
1299 | switch (entry->type) { |
1300 | case NETLBL_NLTYPE_CIPSOV4: |
1301 | ret_val = cipso_v4_skbuff_setattr(skb, doi_def: entry->cipso, |
1302 | secattr); |
1303 | break; |
1304 | case NETLBL_NLTYPE_UNLABELED: |
1305 | /* just delete the protocols we support for right now |
1306 | * but we could remove other protocols if needed */ |
1307 | ret_val = cipso_v4_skbuff_delattr(skb); |
1308 | break; |
1309 | default: |
1310 | ret_val = -ENOENT; |
1311 | } |
1312 | break; |
1313 | #if IS_ENABLED(CONFIG_IPV6) |
1314 | case AF_INET6: |
1315 | hdr6 = ipv6_hdr(skb); |
1316 | entry = netlbl_domhsh_getentry_af6(domain: secattr->domain, |
1317 | addr: &hdr6->daddr); |
1318 | if (entry == NULL) { |
1319 | ret_val = -ENOENT; |
1320 | goto skbuff_setattr_return; |
1321 | } |
1322 | switch (entry->type) { |
1323 | case NETLBL_NLTYPE_CALIPSO: |
1324 | ret_val = calipso_skbuff_setattr(skb, doi_def: entry->calipso, |
1325 | secattr); |
1326 | break; |
1327 | case NETLBL_NLTYPE_UNLABELED: |
1328 | /* just delete the protocols we support for right now |
1329 | * but we could remove other protocols if needed */ |
1330 | ret_val = calipso_skbuff_delattr(skb); |
1331 | break; |
1332 | default: |
1333 | ret_val = -ENOENT; |
1334 | } |
1335 | break; |
1336 | #endif /* IPv6 */ |
1337 | default: |
1338 | ret_val = -EPROTONOSUPPORT; |
1339 | } |
1340 | |
1341 | skbuff_setattr_return: |
1342 | rcu_read_unlock(); |
1343 | return ret_val; |
1344 | } |
1345 | |
1346 | /** |
1347 | * netlbl_skbuff_getattr - Determine the security attributes of a packet |
1348 | * @skb: the packet |
1349 | * @family: protocol family |
1350 | * @secattr: the security attributes |
1351 | * |
1352 | * Description: |
1353 | * Examines the given packet to see if a recognized form of packet labeling |
1354 | * is present, if so it parses the packet label and returns the security |
1355 | * attributes in @secattr. Returns zero on success, negative values on |
1356 | * failure. |
1357 | * |
1358 | */ |
1359 | int netlbl_skbuff_getattr(const struct sk_buff *skb, |
1360 | u16 family, |
1361 | struct netlbl_lsm_secattr *secattr) |
1362 | { |
1363 | unsigned char *ptr; |
1364 | |
1365 | switch (family) { |
1366 | case AF_INET: |
1367 | ptr = cipso_v4_optptr(skb); |
1368 | if (ptr && cipso_v4_getattr(cipso: ptr, secattr) == 0) |
1369 | return 0; |
1370 | break; |
1371 | #if IS_ENABLED(CONFIG_IPV6) |
1372 | case AF_INET6: |
1373 | ptr = calipso_optptr(skb); |
1374 | if (ptr && calipso_getattr(calipso: ptr, secattr) == 0) |
1375 | return 0; |
1376 | break; |
1377 | #endif /* IPv6 */ |
1378 | } |
1379 | |
1380 | return netlbl_unlabel_getattr(skb, family, secattr); |
1381 | } |
1382 | |
1383 | /** |
1384 | * netlbl_skbuff_err - Handle a LSM error on a sk_buff |
1385 | * @skb: the packet |
1386 | * @family: the family |
1387 | * @error: the error code |
1388 | * @gateway: true if host is acting as a gateway, false otherwise |
1389 | * |
1390 | * Description: |
1391 | * Deal with a LSM problem when handling the packet in @skb, typically this is |
1392 | * a permission denied problem (-EACCES). The correct action is determined |
1393 | * according to the packet's labeling protocol. |
1394 | * |
1395 | */ |
1396 | void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway) |
1397 | { |
1398 | switch (family) { |
1399 | case AF_INET: |
1400 | if (cipso_v4_optptr(skb)) |
1401 | cipso_v4_error(skb, error, gateway); |
1402 | break; |
1403 | } |
1404 | } |
1405 | |
1406 | /** |
1407 | * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches |
1408 | * |
1409 | * Description: |
1410 | * For all of the NetLabel protocols that support some form of label mapping |
1411 | * cache, invalidate the cache. Returns zero on success, negative values on |
1412 | * error. |
1413 | * |
1414 | */ |
1415 | void netlbl_cache_invalidate(void) |
1416 | { |
1417 | cipso_v4_cache_invalidate(); |
1418 | #if IS_ENABLED(CONFIG_IPV6) |
1419 | calipso_cache_invalidate(); |
1420 | #endif /* IPv6 */ |
1421 | } |
1422 | |
1423 | /** |
1424 | * netlbl_cache_add - Add an entry to a NetLabel protocol cache |
1425 | * @skb: the packet |
1426 | * @family: the family |
1427 | * @secattr: the packet's security attributes |
1428 | * |
1429 | * Description: |
1430 | * Add the LSM security attributes for the given packet to the underlying |
1431 | * NetLabel protocol's label mapping cache. Returns zero on success, negative |
1432 | * values on error. |
1433 | * |
1434 | */ |
1435 | int netlbl_cache_add(const struct sk_buff *skb, u16 family, |
1436 | const struct netlbl_lsm_secattr *secattr) |
1437 | { |
1438 | unsigned char *ptr; |
1439 | |
1440 | if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0) |
1441 | return -ENOMSG; |
1442 | |
1443 | switch (family) { |
1444 | case AF_INET: |
1445 | ptr = cipso_v4_optptr(skb); |
1446 | if (ptr) |
1447 | return cipso_v4_cache_add(cipso_ptr: ptr, secattr); |
1448 | break; |
1449 | #if IS_ENABLED(CONFIG_IPV6) |
1450 | case AF_INET6: |
1451 | ptr = calipso_optptr(skb); |
1452 | if (ptr) |
1453 | return calipso_cache_add(calipso_ptr: ptr, secattr); |
1454 | break; |
1455 | #endif /* IPv6 */ |
1456 | } |
1457 | return -ENOMSG; |
1458 | } |
1459 | |
1460 | /* |
1461 | * Protocol Engine Functions |
1462 | */ |
1463 | |
1464 | /** |
1465 | * netlbl_audit_start - Start an audit message |
1466 | * @type: audit message type |
1467 | * @audit_info: NetLabel audit information |
1468 | * |
1469 | * Description: |
1470 | * Start an audit message using the type specified in @type and fill the audit |
1471 | * message with some fields common to all NetLabel audit messages. This |
1472 | * function should only be used by protocol engines, not LSMs. Returns a |
1473 | * pointer to the audit buffer on success, NULL on failure. |
1474 | * |
1475 | */ |
1476 | struct audit_buffer *netlbl_audit_start(int type, |
1477 | struct netlbl_audit *audit_info) |
1478 | { |
1479 | return netlbl_audit_start_common(type, audit_info); |
1480 | } |
1481 | EXPORT_SYMBOL(netlbl_audit_start); |
1482 | |
1483 | /* |
1484 | * Setup Functions |
1485 | */ |
1486 | |
1487 | /** |
1488 | * netlbl_init - Initialize NetLabel |
1489 | * |
1490 | * Description: |
1491 | * Perform the required NetLabel initialization before first use. |
1492 | * |
1493 | */ |
1494 | static int __init netlbl_init(void) |
1495 | { |
1496 | int ret_val; |
1497 | |
1498 | printk(KERN_INFO "NetLabel: Initializing\n" ); |
1499 | printk(KERN_INFO "NetLabel: domain hash size = %u\n" , |
1500 | (1 << NETLBL_DOMHSH_BITSIZE)); |
1501 | printk(KERN_INFO "NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO\n" ); |
1502 | |
1503 | ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE); |
1504 | if (ret_val != 0) |
1505 | goto init_failure; |
1506 | |
1507 | ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE); |
1508 | if (ret_val != 0) |
1509 | goto init_failure; |
1510 | |
1511 | ret_val = netlbl_netlink_init(); |
1512 | if (ret_val != 0) |
1513 | goto init_failure; |
1514 | |
1515 | ret_val = netlbl_unlabel_defconf(); |
1516 | if (ret_val != 0) |
1517 | goto init_failure; |
1518 | printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n" ); |
1519 | |
1520 | return 0; |
1521 | |
1522 | init_failure: |
1523 | panic(fmt: "NetLabel: failed to initialize properly (%d)\n" , ret_val); |
1524 | } |
1525 | |
1526 | subsys_initcall(netlbl_init); |
1527 | |