]>
Commit | Line | Data |
---|---|---|
446fda4f PM |
1 | /* |
2 | * CIPSO - Commercial IP Security Option | |
3 | * | |
4 | * This is an implementation of the CIPSO 2.2 protocol as specified in | |
5 | * draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in | |
6 | * FIPS-188, copies of both documents can be found in the Documentation | |
7 | * directory. While CIPSO never became a full IETF RFC standard many vendors | |
8 | * have chosen to adopt the protocol and over the years it has become a | |
9 | * de-facto standard for labeled networking. | |
10 | * | |
11 | * Author: Paul Moore <paul.moore@hp.com> | |
12 | * | |
13 | */ | |
14 | ||
15 | /* | |
16 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or modify | |
19 | * it under the terms of the GNU General Public License as published by | |
20 | * the Free Software Foundation; either version 2 of the License, or | |
21 | * (at your option) any later version. | |
22 | * | |
23 | * This program is distributed in the hope that it will be useful, | |
24 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
26 | * the GNU General Public License for more details. | |
27 | * | |
28 | * You should have received a copy of the GNU General Public License | |
29 | * along with this program; if not, write to the Free Software | |
30 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
31 | * | |
32 | */ | |
33 | ||
34 | #include <linux/init.h> | |
35 | #include <linux/types.h> | |
36 | #include <linux/rcupdate.h> | |
37 | #include <linux/list.h> | |
38 | #include <linux/spinlock.h> | |
39 | #include <linux/string.h> | |
40 | #include <linux/jhash.h> | |
41 | #include <net/ip.h> | |
42 | #include <net/icmp.h> | |
43 | #include <net/tcp.h> | |
44 | #include <net/netlabel.h> | |
45 | #include <net/cipso_ipv4.h> | |
ffb733c6 | 46 | #include <asm/atomic.h> |
446fda4f | 47 | #include <asm/bug.h> |
50e5d35c | 48 | #include <asm/unaligned.h> |
446fda4f PM |
49 | |
50 | struct cipso_v4_domhsh_entry { | |
51 | char *domain; | |
52 | u32 valid; | |
53 | struct list_head list; | |
54 | struct rcu_head rcu; | |
55 | }; | |
56 | ||
57 | /* List of available DOI definitions */ | |
58 | /* XXX - Updates should be minimal so having a single lock for the | |
59 | * cipso_v4_doi_list and the cipso_v4_doi_list->dom_list should be | |
60 | * okay. */ | |
61 | /* XXX - This currently assumes a minimal number of different DOIs in use, | |
62 | * if in practice there are a lot of different DOIs this list should | |
63 | * probably be turned into a hash table or something similar so we | |
64 | * can do quick lookups. */ | |
8ce11e6a | 65 | static DEFINE_SPINLOCK(cipso_v4_doi_list_lock); |
446fda4f PM |
66 | static struct list_head cipso_v4_doi_list = LIST_HEAD_INIT(cipso_v4_doi_list); |
67 | ||
68 | /* Label mapping cache */ | |
69 | int cipso_v4_cache_enabled = 1; | |
70 | int cipso_v4_cache_bucketsize = 10; | |
71 | #define CIPSO_V4_CACHE_BUCKETBITS 7 | |
72 | #define CIPSO_V4_CACHE_BUCKETS (1 << CIPSO_V4_CACHE_BUCKETBITS) | |
73 | #define CIPSO_V4_CACHE_REORDERLIMIT 10 | |
74 | struct cipso_v4_map_cache_bkt { | |
75 | spinlock_t lock; | |
76 | u32 size; | |
77 | struct list_head list; | |
78 | }; | |
79 | struct cipso_v4_map_cache_entry { | |
80 | u32 hash; | |
81 | unsigned char *key; | |
82 | size_t key_len; | |
83 | ||
ffb733c6 | 84 | struct netlbl_lsm_cache *lsm_data; |
446fda4f PM |
85 | |
86 | u32 activity; | |
87 | struct list_head list; | |
88 | }; | |
89 | static struct cipso_v4_map_cache_bkt *cipso_v4_cache = NULL; | |
90 | ||
91 | /* Restricted bitmap (tag #1) flags */ | |
92 | int cipso_v4_rbm_optfmt = 0; | |
93 | int cipso_v4_rbm_strictvalid = 1; | |
94 | ||
f998e8cb PM |
95 | /* |
96 | * Protocol Constants | |
97 | */ | |
98 | ||
99 | /* Maximum size of the CIPSO IP option, derived from the fact that the maximum | |
100 | * IPv4 header size is 60 bytes and the base IPv4 header is 20 bytes long. */ | |
101 | #define CIPSO_V4_OPT_LEN_MAX 40 | |
102 | ||
103 | /* Length of the base CIPSO option, this includes the option type (1 byte), the | |
104 | * option length (1 byte), and the DOI (4 bytes). */ | |
105 | #define CIPSO_V4_HDR_LEN 6 | |
106 | ||
107 | /* Base length of the restrictive category bitmap tag (tag #1). */ | |
108 | #define CIPSO_V4_TAG_RBM_BLEN 4 | |
109 | ||
110 | /* Base length of the enumerated category tag (tag #2). */ | |
111 | #define CIPSO_V4_TAG_ENUM_BLEN 4 | |
112 | ||
113 | /* Base length of the ranged categories bitmap tag (tag #5). */ | |
114 | #define CIPSO_V4_TAG_RNG_BLEN 4 | |
115 | /* The maximum number of category ranges permitted in the ranged category tag | |
116 | * (tag #5). You may note that the IETF draft states that the maximum number | |
117 | * of category ranges is 7, but if the low end of the last category range is | |
118 | * zero then it is possibile to fit 8 category ranges because the zero should | |
119 | * be omitted. */ | |
120 | #define CIPSO_V4_TAG_RNG_CAT_MAX 8 | |
121 | ||
446fda4f PM |
122 | /* |
123 | * Helper Functions | |
124 | */ | |
125 | ||
126 | /** | |
127 | * cipso_v4_bitmap_walk - Walk a bitmap looking for a bit | |
128 | * @bitmap: the bitmap | |
129 | * @bitmap_len: length in bits | |
130 | * @offset: starting offset | |
131 | * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit | |
132 | * | |
133 | * Description: | |
134 | * Starting at @offset, walk the bitmap from left to right until either the | |
135 | * desired bit is found or we reach the end. Return the bit offset, -1 if | |
136 | * not found, or -2 if error. | |
137 | */ | |
138 | static int cipso_v4_bitmap_walk(const unsigned char *bitmap, | |
139 | u32 bitmap_len, | |
140 | u32 offset, | |
141 | u8 state) | |
142 | { | |
143 | u32 bit_spot; | |
144 | u32 byte_offset; | |
145 | unsigned char bitmask; | |
146 | unsigned char byte; | |
147 | ||
148 | /* gcc always rounds to zero when doing integer division */ | |
149 | byte_offset = offset / 8; | |
150 | byte = bitmap[byte_offset]; | |
151 | bit_spot = offset; | |
152 | bitmask = 0x80 >> (offset % 8); | |
153 | ||
154 | while (bit_spot < bitmap_len) { | |
155 | if ((state && (byte & bitmask) == bitmask) || | |
156 | (state == 0 && (byte & bitmask) == 0)) | |
157 | return bit_spot; | |
158 | ||
159 | bit_spot++; | |
160 | bitmask >>= 1; | |
161 | if (bitmask == 0) { | |
162 | byte = bitmap[++byte_offset]; | |
163 | bitmask = 0x80; | |
164 | } | |
165 | } | |
166 | ||
167 | return -1; | |
168 | } | |
169 | ||
170 | /** | |
171 | * cipso_v4_bitmap_setbit - Sets a single bit in a bitmap | |
172 | * @bitmap: the bitmap | |
173 | * @bit: the bit | |
174 | * @state: if non-zero, set the bit (1) else clear the bit (0) | |
175 | * | |
176 | * Description: | |
177 | * Set a single bit in the bitmask. Returns zero on success, negative values | |
178 | * on error. | |
179 | */ | |
180 | static void cipso_v4_bitmap_setbit(unsigned char *bitmap, | |
181 | u32 bit, | |
182 | u8 state) | |
183 | { | |
184 | u32 byte_spot; | |
185 | u8 bitmask; | |
186 | ||
187 | /* gcc always rounds to zero when doing integer division */ | |
188 | byte_spot = bit / 8; | |
189 | bitmask = 0x80 >> (bit % 8); | |
190 | if (state) | |
191 | bitmap[byte_spot] |= bitmask; | |
192 | else | |
193 | bitmap[byte_spot] &= ~bitmask; | |
194 | } | |
195 | ||
196 | /** | |
197 | * cipso_v4_doi_domhsh_free - Frees a domain list entry | |
198 | * @entry: the entry's RCU field | |
199 | * | |
200 | * Description: | |
201 | * This function is designed to be used as a callback to the call_rcu() | |
202 | * function so that the memory allocated to a domain list entry can be released | |
203 | * safely. | |
204 | * | |
205 | */ | |
206 | static void cipso_v4_doi_domhsh_free(struct rcu_head *entry) | |
207 | { | |
208 | struct cipso_v4_domhsh_entry *ptr; | |
209 | ||
210 | ptr = container_of(entry, struct cipso_v4_domhsh_entry, rcu); | |
211 | kfree(ptr->domain); | |
212 | kfree(ptr); | |
213 | } | |
214 | ||
215 | /** | |
216 | * cipso_v4_cache_entry_free - Frees a cache entry | |
217 | * @entry: the entry to free | |
218 | * | |
219 | * Description: | |
ffb733c6 | 220 | * This function frees the memory associated with a cache entry including the |
221 | * LSM cache data if there are no longer any users, i.e. reference count == 0. | |
446fda4f PM |
222 | * |
223 | */ | |
224 | static void cipso_v4_cache_entry_free(struct cipso_v4_map_cache_entry *entry) | |
225 | { | |
ffb733c6 | 226 | if (entry->lsm_data) |
227 | netlbl_secattr_cache_free(entry->lsm_data); | |
446fda4f PM |
228 | kfree(entry->key); |
229 | kfree(entry); | |
230 | } | |
231 | ||
232 | /** | |
233 | * cipso_v4_map_cache_hash - Hashing function for the CIPSO cache | |
234 | * @key: the hash key | |
235 | * @key_len: the length of the key in bytes | |
236 | * | |
237 | * Description: | |
238 | * The CIPSO tag hashing function. Returns a 32-bit hash value. | |
239 | * | |
240 | */ | |
241 | static u32 cipso_v4_map_cache_hash(const unsigned char *key, u32 key_len) | |
242 | { | |
243 | return jhash(key, key_len, 0); | |
244 | } | |
245 | ||
246 | /* | |
247 | * Label Mapping Cache Functions | |
248 | */ | |
249 | ||
250 | /** | |
251 | * cipso_v4_cache_init - Initialize the CIPSO cache | |
252 | * | |
253 | * Description: | |
254 | * Initializes the CIPSO label mapping cache, this function should be called | |
255 | * before any of the other functions defined in this file. Returns zero on | |
256 | * success, negative values on error. | |
257 | * | |
258 | */ | |
259 | static int cipso_v4_cache_init(void) | |
260 | { | |
261 | u32 iter; | |
262 | ||
263 | cipso_v4_cache = kcalloc(CIPSO_V4_CACHE_BUCKETS, | |
264 | sizeof(struct cipso_v4_map_cache_bkt), | |
265 | GFP_KERNEL); | |
266 | if (cipso_v4_cache == NULL) | |
267 | return -ENOMEM; | |
268 | ||
269 | for (iter = 0; iter < CIPSO_V4_CACHE_BUCKETS; iter++) { | |
270 | spin_lock_init(&cipso_v4_cache[iter].lock); | |
271 | cipso_v4_cache[iter].size = 0; | |
272 | INIT_LIST_HEAD(&cipso_v4_cache[iter].list); | |
273 | } | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | /** | |
279 | * cipso_v4_cache_invalidate - Invalidates the current CIPSO cache | |
280 | * | |
281 | * Description: | |
282 | * Invalidates and frees any entries in the CIPSO cache. Returns zero on | |
283 | * success and negative values on failure. | |
284 | * | |
285 | */ | |
286 | void cipso_v4_cache_invalidate(void) | |
287 | { | |
288 | struct cipso_v4_map_cache_entry *entry, *tmp_entry; | |
289 | u32 iter; | |
290 | ||
291 | for (iter = 0; iter < CIPSO_V4_CACHE_BUCKETS; iter++) { | |
609c92fe | 292 | spin_lock_bh(&cipso_v4_cache[iter].lock); |
446fda4f PM |
293 | list_for_each_entry_safe(entry, |
294 | tmp_entry, | |
295 | &cipso_v4_cache[iter].list, list) { | |
296 | list_del(&entry->list); | |
297 | cipso_v4_cache_entry_free(entry); | |
298 | } | |
299 | cipso_v4_cache[iter].size = 0; | |
609c92fe | 300 | spin_unlock_bh(&cipso_v4_cache[iter].lock); |
446fda4f PM |
301 | } |
302 | ||
303 | return; | |
304 | } | |
305 | ||
306 | /** | |
307 | * cipso_v4_cache_check - Check the CIPSO cache for a label mapping | |
308 | * @key: the buffer to check | |
309 | * @key_len: buffer length in bytes | |
310 | * @secattr: the security attribute struct to use | |
311 | * | |
312 | * Description: | |
313 | * This function checks the cache to see if a label mapping already exists for | |
314 | * the given key. If there is a match then the cache is adjusted and the | |
315 | * @secattr struct is populated with the correct LSM security attributes. The | |
316 | * cache is adjusted in the following manner if the entry is not already the | |
317 | * first in the cache bucket: | |
318 | * | |
319 | * 1. The cache entry's activity counter is incremented | |
320 | * 2. The previous (higher ranking) entry's activity counter is decremented | |
321 | * 3. If the difference between the two activity counters is geater than | |
322 | * CIPSO_V4_CACHE_REORDERLIMIT the two entries are swapped | |
323 | * | |
324 | * Returns zero on success, -ENOENT for a cache miss, and other negative values | |
325 | * on error. | |
326 | * | |
327 | */ | |
328 | static int cipso_v4_cache_check(const unsigned char *key, | |
329 | u32 key_len, | |
330 | struct netlbl_lsm_secattr *secattr) | |
331 | { | |
332 | u32 bkt; | |
333 | struct cipso_v4_map_cache_entry *entry; | |
334 | struct cipso_v4_map_cache_entry *prev_entry = NULL; | |
335 | u32 hash; | |
336 | ||
337 | if (!cipso_v4_cache_enabled) | |
338 | return -ENOENT; | |
339 | ||
340 | hash = cipso_v4_map_cache_hash(key, key_len); | |
341 | bkt = hash & (CIPSO_V4_CACHE_BUCKETBITS - 1); | |
609c92fe | 342 | spin_lock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
343 | list_for_each_entry(entry, &cipso_v4_cache[bkt].list, list) { |
344 | if (entry->hash == hash && | |
345 | entry->key_len == key_len && | |
346 | memcmp(entry->key, key, key_len) == 0) { | |
347 | entry->activity += 1; | |
ffb733c6 | 348 | atomic_inc(&entry->lsm_data->refcount); |
349 | secattr->cache = entry->lsm_data; | |
701a90ba | 350 | secattr->flags |= NETLBL_SECATTR_CACHE; |
446fda4f | 351 | if (prev_entry == NULL) { |
609c92fe | 352 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
353 | return 0; |
354 | } | |
355 | ||
356 | if (prev_entry->activity > 0) | |
357 | prev_entry->activity -= 1; | |
358 | if (entry->activity > prev_entry->activity && | |
359 | entry->activity - prev_entry->activity > | |
360 | CIPSO_V4_CACHE_REORDERLIMIT) { | |
361 | __list_del(entry->list.prev, entry->list.next); | |
362 | __list_add(&entry->list, | |
363 | prev_entry->list.prev, | |
364 | &prev_entry->list); | |
365 | } | |
366 | ||
609c92fe | 367 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
368 | return 0; |
369 | } | |
370 | prev_entry = entry; | |
371 | } | |
609c92fe | 372 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
373 | |
374 | return -ENOENT; | |
375 | } | |
376 | ||
377 | /** | |
378 | * cipso_v4_cache_add - Add an entry to the CIPSO cache | |
379 | * @skb: the packet | |
380 | * @secattr: the packet's security attributes | |
381 | * | |
382 | * Description: | |
383 | * Add a new entry into the CIPSO label mapping cache. Add the new entry to | |
384 | * head of the cache bucket's list, if the cache bucket is out of room remove | |
385 | * the last entry in the list first. It is important to note that there is | |
386 | * currently no checking for duplicate keys. Returns zero on success, | |
387 | * negative values on failure. | |
388 | * | |
389 | */ | |
390 | int cipso_v4_cache_add(const struct sk_buff *skb, | |
391 | const struct netlbl_lsm_secattr *secattr) | |
392 | { | |
393 | int ret_val = -EPERM; | |
394 | u32 bkt; | |
395 | struct cipso_v4_map_cache_entry *entry = NULL; | |
396 | struct cipso_v4_map_cache_entry *old_entry = NULL; | |
397 | unsigned char *cipso_ptr; | |
398 | u32 cipso_ptr_len; | |
399 | ||
400 | if (!cipso_v4_cache_enabled || cipso_v4_cache_bucketsize <= 0) | |
401 | return 0; | |
402 | ||
403 | cipso_ptr = CIPSO_V4_OPTPTR(skb); | |
404 | cipso_ptr_len = cipso_ptr[1]; | |
405 | ||
406 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
407 | if (entry == NULL) | |
408 | return -ENOMEM; | |
fac5d731 | 409 | entry->key = kmemdup(cipso_ptr, cipso_ptr_len, GFP_ATOMIC); |
446fda4f PM |
410 | if (entry->key == NULL) { |
411 | ret_val = -ENOMEM; | |
412 | goto cache_add_failure; | |
413 | } | |
446fda4f PM |
414 | entry->key_len = cipso_ptr_len; |
415 | entry->hash = cipso_v4_map_cache_hash(cipso_ptr, cipso_ptr_len); | |
ffb733c6 | 416 | atomic_inc(&secattr->cache->refcount); |
417 | entry->lsm_data = secattr->cache; | |
446fda4f PM |
418 | |
419 | bkt = entry->hash & (CIPSO_V4_CACHE_BUCKETBITS - 1); | |
609c92fe | 420 | spin_lock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
421 | if (cipso_v4_cache[bkt].size < cipso_v4_cache_bucketsize) { |
422 | list_add(&entry->list, &cipso_v4_cache[bkt].list); | |
423 | cipso_v4_cache[bkt].size += 1; | |
424 | } else { | |
425 | old_entry = list_entry(cipso_v4_cache[bkt].list.prev, | |
426 | struct cipso_v4_map_cache_entry, list); | |
427 | list_del(&old_entry->list); | |
428 | list_add(&entry->list, &cipso_v4_cache[bkt].list); | |
429 | cipso_v4_cache_entry_free(old_entry); | |
430 | } | |
609c92fe | 431 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
432 | |
433 | return 0; | |
434 | ||
435 | cache_add_failure: | |
436 | if (entry) | |
437 | cipso_v4_cache_entry_free(entry); | |
438 | return ret_val; | |
439 | } | |
440 | ||
441 | /* | |
442 | * DOI List Functions | |
443 | */ | |
444 | ||
445 | /** | |
446 | * cipso_v4_doi_search - Searches for a DOI definition | |
447 | * @doi: the DOI to search for | |
448 | * | |
449 | * Description: | |
450 | * Search the DOI definition list for a DOI definition with a DOI value that | |
451 | * matches @doi. The caller is responsibile for calling rcu_read_[un]lock(). | |
452 | * Returns a pointer to the DOI definition on success and NULL on failure. | |
453 | */ | |
454 | static struct cipso_v4_doi *cipso_v4_doi_search(u32 doi) | |
455 | { | |
456 | struct cipso_v4_doi *iter; | |
457 | ||
458 | list_for_each_entry_rcu(iter, &cipso_v4_doi_list, list) | |
459 | if (iter->doi == doi && iter->valid) | |
460 | return iter; | |
461 | return NULL; | |
462 | } | |
463 | ||
464 | /** | |
465 | * cipso_v4_doi_add - Add a new DOI to the CIPSO protocol engine | |
466 | * @doi_def: the DOI structure | |
467 | * | |
468 | * Description: | |
469 | * The caller defines a new DOI for use by the CIPSO engine and calls this | |
470 | * function to add it to the list of acceptable domains. The caller must | |
471 | * ensure that the mapping table specified in @doi_def->map meets all of the | |
472 | * requirements of the mapping type (see cipso_ipv4.h for details). Returns | |
473 | * zero on success and non-zero on failure. | |
474 | * | |
475 | */ | |
476 | int cipso_v4_doi_add(struct cipso_v4_doi *doi_def) | |
477 | { | |
6ce61a7c PM |
478 | u32 iter; |
479 | ||
446fda4f PM |
480 | if (doi_def == NULL || doi_def->doi == CIPSO_V4_DOI_UNKNOWN) |
481 | return -EINVAL; | |
6ce61a7c PM |
482 | for (iter = 0; iter < CIPSO_V4_TAG_MAXCNT; iter++) { |
483 | switch (doi_def->tags[iter]) { | |
484 | case CIPSO_V4_TAG_RBITMAP: | |
485 | break; | |
484b3669 PM |
486 | case CIPSO_V4_TAG_RANGE: |
487 | if (doi_def->type != CIPSO_V4_MAP_PASS) | |
488 | return -EINVAL; | |
489 | break; | |
6ce61a7c PM |
490 | case CIPSO_V4_TAG_INVALID: |
491 | if (iter == 0) | |
492 | return -EINVAL; | |
493 | break; | |
654bbc2a PM |
494 | case CIPSO_V4_TAG_ENUM: |
495 | if (doi_def->type != CIPSO_V4_MAP_PASS) | |
496 | return -EINVAL; | |
497 | break; | |
6ce61a7c PM |
498 | default: |
499 | return -EINVAL; | |
500 | } | |
501 | } | |
446fda4f PM |
502 | |
503 | doi_def->valid = 1; | |
504 | INIT_RCU_HEAD(&doi_def->rcu); | |
505 | INIT_LIST_HEAD(&doi_def->dom_list); | |
506 | ||
507 | rcu_read_lock(); | |
508 | if (cipso_v4_doi_search(doi_def->doi) != NULL) | |
509 | goto doi_add_failure_rlock; | |
510 | spin_lock(&cipso_v4_doi_list_lock); | |
511 | if (cipso_v4_doi_search(doi_def->doi) != NULL) | |
512 | goto doi_add_failure_slock; | |
513 | list_add_tail_rcu(&doi_def->list, &cipso_v4_doi_list); | |
514 | spin_unlock(&cipso_v4_doi_list_lock); | |
515 | rcu_read_unlock(); | |
516 | ||
517 | return 0; | |
518 | ||
519 | doi_add_failure_slock: | |
520 | spin_unlock(&cipso_v4_doi_list_lock); | |
521 | doi_add_failure_rlock: | |
522 | rcu_read_unlock(); | |
523 | return -EEXIST; | |
524 | } | |
525 | ||
526 | /** | |
527 | * cipso_v4_doi_remove - Remove an existing DOI from the CIPSO protocol engine | |
528 | * @doi: the DOI value | |
32f50cde | 529 | * @audit_secid: the LSM secid to use in the audit message |
446fda4f PM |
530 | * @callback: the DOI cleanup/free callback |
531 | * | |
532 | * Description: | |
533 | * Removes a DOI definition from the CIPSO engine, @callback is called to | |
534 | * free any memory. The NetLabel routines will be called to release their own | |
535 | * LSM domain mappings as well as our own domain list. Returns zero on | |
536 | * success and negative values on failure. | |
537 | * | |
538 | */ | |
32f50cde | 539 | int cipso_v4_doi_remove(u32 doi, |
95d4e6be | 540 | struct netlbl_audit *audit_info, |
32f50cde | 541 | void (*callback) (struct rcu_head * head)) |
446fda4f PM |
542 | { |
543 | struct cipso_v4_doi *doi_def; | |
544 | struct cipso_v4_domhsh_entry *dom_iter; | |
545 | ||
546 | rcu_read_lock(); | |
547 | if (cipso_v4_doi_search(doi) != NULL) { | |
548 | spin_lock(&cipso_v4_doi_list_lock); | |
549 | doi_def = cipso_v4_doi_search(doi); | |
550 | if (doi_def == NULL) { | |
551 | spin_unlock(&cipso_v4_doi_list_lock); | |
552 | rcu_read_unlock(); | |
553 | return -ENOENT; | |
554 | } | |
555 | doi_def->valid = 0; | |
556 | list_del_rcu(&doi_def->list); | |
557 | spin_unlock(&cipso_v4_doi_list_lock); | |
558 | list_for_each_entry_rcu(dom_iter, &doi_def->dom_list, list) | |
559 | if (dom_iter->valid) | |
32f50cde | 560 | netlbl_domhsh_remove(dom_iter->domain, |
95d4e6be | 561 | audit_info); |
446fda4f PM |
562 | cipso_v4_cache_invalidate(); |
563 | rcu_read_unlock(); | |
564 | ||
565 | call_rcu(&doi_def->rcu, callback); | |
566 | return 0; | |
567 | } | |
568 | rcu_read_unlock(); | |
569 | ||
570 | return -ENOENT; | |
571 | } | |
572 | ||
573 | /** | |
574 | * cipso_v4_doi_getdef - Returns a pointer to a valid DOI definition | |
575 | * @doi: the DOI value | |
576 | * | |
577 | * Description: | |
578 | * Searches for a valid DOI definition and if one is found it is returned to | |
579 | * the caller. Otherwise NULL is returned. The caller must ensure that | |
580 | * rcu_read_lock() is held while accessing the returned definition. | |
581 | * | |
582 | */ | |
583 | struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi) | |
584 | { | |
585 | return cipso_v4_doi_search(doi); | |
586 | } | |
587 | ||
588 | /** | |
fcd48280 PM |
589 | * cipso_v4_doi_walk - Iterate through the DOI definitions |
590 | * @skip_cnt: skip past this number of DOI definitions, updated | |
591 | * @callback: callback for each DOI definition | |
592 | * @cb_arg: argument for the callback function | |
446fda4f PM |
593 | * |
594 | * Description: | |
fcd48280 PM |
595 | * Iterate over the DOI definition list, skipping the first @skip_cnt entries. |
596 | * For each entry call @callback, if @callback returns a negative value stop | |
597 | * 'walking' through the list and return. Updates the value in @skip_cnt upon | |
598 | * return. Returns zero on success, negative values on failure. | |
446fda4f PM |
599 | * |
600 | */ | |
fcd48280 PM |
601 | int cipso_v4_doi_walk(u32 *skip_cnt, |
602 | int (*callback) (struct cipso_v4_doi *doi_def, void *arg), | |
603 | void *cb_arg) | |
446fda4f | 604 | { |
fcd48280 | 605 | int ret_val = -ENOENT; |
446fda4f | 606 | u32 doi_cnt = 0; |
fcd48280 | 607 | struct cipso_v4_doi *iter_doi; |
446fda4f | 608 | |
446fda4f | 609 | rcu_read_lock(); |
fcd48280 PM |
610 | list_for_each_entry_rcu(iter_doi, &cipso_v4_doi_list, list) |
611 | if (iter_doi->valid) { | |
612 | if (doi_cnt++ < *skip_cnt) | |
613 | continue; | |
614 | ret_val = callback(iter_doi, cb_arg); | |
615 | if (ret_val < 0) { | |
616 | doi_cnt--; | |
617 | goto doi_walk_return; | |
446fda4f | 618 | } |
446fda4f | 619 | } |
446fda4f | 620 | |
fcd48280 | 621 | doi_walk_return: |
446fda4f | 622 | rcu_read_unlock(); |
fcd48280 PM |
623 | *skip_cnt = doi_cnt; |
624 | return ret_val; | |
446fda4f PM |
625 | } |
626 | ||
627 | /** | |
628 | * cipso_v4_doi_domhsh_add - Adds a domain entry to a DOI definition | |
629 | * @doi_def: the DOI definition | |
630 | * @domain: the domain to add | |
631 | * | |
632 | * Description: | |
59c51591 | 633 | * Adds the @domain to the DOI specified by @doi_def, this function |
446fda4f PM |
634 | * should only be called by external functions (i.e. NetLabel). This function |
635 | * does allocate memory. Returns zero on success, negative values on failure. | |
636 | * | |
637 | */ | |
638 | int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, const char *domain) | |
639 | { | |
640 | struct cipso_v4_domhsh_entry *iter; | |
641 | struct cipso_v4_domhsh_entry *new_dom; | |
642 | ||
643 | new_dom = kzalloc(sizeof(*new_dom), GFP_KERNEL); | |
644 | if (new_dom == NULL) | |
645 | return -ENOMEM; | |
646 | if (domain) { | |
647 | new_dom->domain = kstrdup(domain, GFP_KERNEL); | |
648 | if (new_dom->domain == NULL) { | |
649 | kfree(new_dom); | |
650 | return -ENOMEM; | |
651 | } | |
652 | } | |
653 | new_dom->valid = 1; | |
654 | INIT_RCU_HEAD(&new_dom->rcu); | |
655 | ||
656 | rcu_read_lock(); | |
657 | spin_lock(&cipso_v4_doi_list_lock); | |
658 | list_for_each_entry_rcu(iter, &doi_def->dom_list, list) | |
659 | if (iter->valid && | |
660 | ((domain != NULL && iter->domain != NULL && | |
661 | strcmp(iter->domain, domain) == 0) || | |
662 | (domain == NULL && iter->domain == NULL))) { | |
663 | spin_unlock(&cipso_v4_doi_list_lock); | |
664 | rcu_read_unlock(); | |
665 | kfree(new_dom->domain); | |
666 | kfree(new_dom); | |
667 | return -EEXIST; | |
668 | } | |
669 | list_add_tail_rcu(&new_dom->list, &doi_def->dom_list); | |
670 | spin_unlock(&cipso_v4_doi_list_lock); | |
671 | rcu_read_unlock(); | |
672 | ||
673 | return 0; | |
674 | } | |
675 | ||
676 | /** | |
677 | * cipso_v4_doi_domhsh_remove - Removes a domain entry from a DOI definition | |
678 | * @doi_def: the DOI definition | |
679 | * @domain: the domain to remove | |
680 | * | |
681 | * Description: | |
682 | * Removes the @domain from the DOI specified by @doi_def, this function | |
683 | * should only be called by external functions (i.e. NetLabel). Returns zero | |
684 | * on success and negative values on error. | |
685 | * | |
686 | */ | |
687 | int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def, | |
688 | const char *domain) | |
689 | { | |
690 | struct cipso_v4_domhsh_entry *iter; | |
691 | ||
692 | rcu_read_lock(); | |
693 | spin_lock(&cipso_v4_doi_list_lock); | |
694 | list_for_each_entry_rcu(iter, &doi_def->dom_list, list) | |
695 | if (iter->valid && | |
696 | ((domain != NULL && iter->domain != NULL && | |
697 | strcmp(iter->domain, domain) == 0) || | |
698 | (domain == NULL && iter->domain == NULL))) { | |
699 | iter->valid = 0; | |
700 | list_del_rcu(&iter->list); | |
701 | spin_unlock(&cipso_v4_doi_list_lock); | |
702 | rcu_read_unlock(); | |
703 | call_rcu(&iter->rcu, cipso_v4_doi_domhsh_free); | |
704 | ||
705 | return 0; | |
706 | } | |
707 | spin_unlock(&cipso_v4_doi_list_lock); | |
708 | rcu_read_unlock(); | |
709 | ||
710 | return -ENOENT; | |
711 | } | |
712 | ||
713 | /* | |
714 | * Label Mapping Functions | |
715 | */ | |
716 | ||
717 | /** | |
718 | * cipso_v4_map_lvl_valid - Checks to see if the given level is understood | |
719 | * @doi_def: the DOI definition | |
720 | * @level: the level to check | |
721 | * | |
722 | * Description: | |
723 | * Checks the given level against the given DOI definition and returns a | |
724 | * negative value if the level does not have a valid mapping and a zero value | |
725 | * if the level is defined by the DOI. | |
726 | * | |
727 | */ | |
728 | static int cipso_v4_map_lvl_valid(const struct cipso_v4_doi *doi_def, u8 level) | |
729 | { | |
730 | switch (doi_def->type) { | |
731 | case CIPSO_V4_MAP_PASS: | |
732 | return 0; | |
733 | case CIPSO_V4_MAP_STD: | |
734 | if (doi_def->map.std->lvl.cipso[level] < CIPSO_V4_INV_LVL) | |
735 | return 0; | |
736 | break; | |
737 | } | |
738 | ||
739 | return -EFAULT; | |
740 | } | |
741 | ||
742 | /** | |
743 | * cipso_v4_map_lvl_hton - Perform a level mapping from the host to the network | |
744 | * @doi_def: the DOI definition | |
745 | * @host_lvl: the host MLS level | |
746 | * @net_lvl: the network/CIPSO MLS level | |
747 | * | |
748 | * Description: | |
749 | * Perform a label mapping to translate a local MLS level to the correct | |
750 | * CIPSO level using the given DOI definition. Returns zero on success, | |
751 | * negative values otherwise. | |
752 | * | |
753 | */ | |
754 | static int cipso_v4_map_lvl_hton(const struct cipso_v4_doi *doi_def, | |
755 | u32 host_lvl, | |
756 | u32 *net_lvl) | |
757 | { | |
758 | switch (doi_def->type) { | |
759 | case CIPSO_V4_MAP_PASS: | |
760 | *net_lvl = host_lvl; | |
761 | return 0; | |
762 | case CIPSO_V4_MAP_STD: | |
c6387a86 PM |
763 | if (host_lvl < doi_def->map.std->lvl.local_size && |
764 | doi_def->map.std->lvl.local[host_lvl] < CIPSO_V4_INV_LVL) { | |
446fda4f PM |
765 | *net_lvl = doi_def->map.std->lvl.local[host_lvl]; |
766 | return 0; | |
767 | } | |
c6387a86 | 768 | return -EPERM; |
446fda4f PM |
769 | } |
770 | ||
771 | return -EINVAL; | |
772 | } | |
773 | ||
774 | /** | |
775 | * cipso_v4_map_lvl_ntoh - Perform a level mapping from the network to the host | |
776 | * @doi_def: the DOI definition | |
777 | * @net_lvl: the network/CIPSO MLS level | |
778 | * @host_lvl: the host MLS level | |
779 | * | |
780 | * Description: | |
781 | * Perform a label mapping to translate a CIPSO level to the correct local MLS | |
782 | * level using the given DOI definition. Returns zero on success, negative | |
783 | * values otherwise. | |
784 | * | |
785 | */ | |
786 | static int cipso_v4_map_lvl_ntoh(const struct cipso_v4_doi *doi_def, | |
787 | u32 net_lvl, | |
788 | u32 *host_lvl) | |
789 | { | |
790 | struct cipso_v4_std_map_tbl *map_tbl; | |
791 | ||
792 | switch (doi_def->type) { | |
793 | case CIPSO_V4_MAP_PASS: | |
794 | *host_lvl = net_lvl; | |
795 | return 0; | |
796 | case CIPSO_V4_MAP_STD: | |
797 | map_tbl = doi_def->map.std; | |
798 | if (net_lvl < map_tbl->lvl.cipso_size && | |
799 | map_tbl->lvl.cipso[net_lvl] < CIPSO_V4_INV_LVL) { | |
800 | *host_lvl = doi_def->map.std->lvl.cipso[net_lvl]; | |
801 | return 0; | |
802 | } | |
c6387a86 | 803 | return -EPERM; |
446fda4f PM |
804 | } |
805 | ||
806 | return -EINVAL; | |
807 | } | |
808 | ||
809 | /** | |
810 | * cipso_v4_map_cat_rbm_valid - Checks to see if the category bitmap is valid | |
811 | * @doi_def: the DOI definition | |
812 | * @bitmap: category bitmap | |
813 | * @bitmap_len: bitmap length in bytes | |
814 | * | |
815 | * Description: | |
816 | * Checks the given category bitmap against the given DOI definition and | |
817 | * returns a negative value if any of the categories in the bitmap do not have | |
818 | * a valid mapping and a zero value if all of the categories are valid. | |
819 | * | |
820 | */ | |
821 | static int cipso_v4_map_cat_rbm_valid(const struct cipso_v4_doi *doi_def, | |
822 | const unsigned char *bitmap, | |
823 | u32 bitmap_len) | |
824 | { | |
825 | int cat = -1; | |
826 | u32 bitmap_len_bits = bitmap_len * 8; | |
044a68ed PM |
827 | u32 cipso_cat_size; |
828 | u32 *cipso_array; | |
446fda4f PM |
829 | |
830 | switch (doi_def->type) { | |
831 | case CIPSO_V4_MAP_PASS: | |
832 | return 0; | |
833 | case CIPSO_V4_MAP_STD: | |
044a68ed PM |
834 | cipso_cat_size = doi_def->map.std->cat.cipso_size; |
835 | cipso_array = doi_def->map.std->cat.cipso; | |
446fda4f PM |
836 | for (;;) { |
837 | cat = cipso_v4_bitmap_walk(bitmap, | |
838 | bitmap_len_bits, | |
839 | cat + 1, | |
840 | 1); | |
841 | if (cat < 0) | |
842 | break; | |
843 | if (cat >= cipso_cat_size || | |
844 | cipso_array[cat] >= CIPSO_V4_INV_CAT) | |
845 | return -EFAULT; | |
846 | } | |
847 | ||
848 | if (cat == -1) | |
849 | return 0; | |
850 | break; | |
851 | } | |
852 | ||
853 | return -EFAULT; | |
854 | } | |
855 | ||
856 | /** | |
857 | * cipso_v4_map_cat_rbm_hton - Perform a category mapping from host to network | |
858 | * @doi_def: the DOI definition | |
02752760 | 859 | * @secattr: the security attributes |
446fda4f PM |
860 | * @net_cat: the zero'd out category bitmap in network/CIPSO format |
861 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
862 | * | |
863 | * Description: | |
864 | * Perform a label mapping to translate a local MLS category bitmap to the | |
865 | * correct CIPSO bitmap using the given DOI definition. Returns the minimum | |
866 | * size in bytes of the network bitmap on success, negative values otherwise. | |
867 | * | |
868 | */ | |
869 | static int cipso_v4_map_cat_rbm_hton(const struct cipso_v4_doi *doi_def, | |
02752760 | 870 | const struct netlbl_lsm_secattr *secattr, |
446fda4f PM |
871 | unsigned char *net_cat, |
872 | u32 net_cat_len) | |
873 | { | |
874 | int host_spot = -1; | |
02752760 | 875 | u32 net_spot = CIPSO_V4_INV_CAT; |
446fda4f | 876 | u32 net_spot_max = 0; |
446fda4f | 877 | u32 net_clen_bits = net_cat_len * 8; |
02752760 PM |
878 | u32 host_cat_size = 0; |
879 | u32 *host_cat_array = NULL; | |
446fda4f | 880 | |
02752760 | 881 | if (doi_def->type == CIPSO_V4_MAP_STD) { |
044a68ed PM |
882 | host_cat_size = doi_def->map.std->cat.local_size; |
883 | host_cat_array = doi_def->map.std->cat.local; | |
02752760 PM |
884 | } |
885 | ||
886 | for (;;) { | |
887 | host_spot = netlbl_secattr_catmap_walk(secattr->mls_cat, | |
888 | host_spot + 1); | |
889 | if (host_spot < 0) | |
890 | break; | |
891 | ||
892 | switch (doi_def->type) { | |
893 | case CIPSO_V4_MAP_PASS: | |
894 | net_spot = host_spot; | |
895 | break; | |
896 | case CIPSO_V4_MAP_STD: | |
446fda4f PM |
897 | if (host_spot >= host_cat_size) |
898 | return -EPERM; | |
446fda4f | 899 | net_spot = host_cat_array[host_spot]; |
9fade4bf PM |
900 | if (net_spot >= CIPSO_V4_INV_CAT) |
901 | return -EPERM; | |
02752760 | 902 | break; |
446fda4f | 903 | } |
02752760 PM |
904 | if (net_spot >= net_clen_bits) |
905 | return -ENOSPC; | |
906 | cipso_v4_bitmap_setbit(net_cat, net_spot, 1); | |
446fda4f | 907 | |
02752760 PM |
908 | if (net_spot > net_spot_max) |
909 | net_spot_max = net_spot; | |
446fda4f PM |
910 | } |
911 | ||
02752760 PM |
912 | if (++net_spot_max % 8) |
913 | return net_spot_max / 8 + 1; | |
914 | return net_spot_max / 8; | |
446fda4f PM |
915 | } |
916 | ||
917 | /** | |
918 | * cipso_v4_map_cat_rbm_ntoh - Perform a category mapping from network to host | |
919 | * @doi_def: the DOI definition | |
920 | * @net_cat: the category bitmap in network/CIPSO format | |
921 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
02752760 | 922 | * @secattr: the security attributes |
446fda4f PM |
923 | * |
924 | * Description: | |
925 | * Perform a label mapping to translate a CIPSO bitmap to the correct local | |
02752760 PM |
926 | * MLS category bitmap using the given DOI definition. Returns zero on |
927 | * success, negative values on failure. | |
446fda4f PM |
928 | * |
929 | */ | |
930 | static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def, | |
931 | const unsigned char *net_cat, | |
932 | u32 net_cat_len, | |
02752760 | 933 | struct netlbl_lsm_secattr *secattr) |
446fda4f | 934 | { |
02752760 | 935 | int ret_val; |
446fda4f | 936 | int net_spot = -1; |
02752760 | 937 | u32 host_spot = CIPSO_V4_INV_CAT; |
446fda4f | 938 | u32 net_clen_bits = net_cat_len * 8; |
02752760 PM |
939 | u32 net_cat_size = 0; |
940 | u32 *net_cat_array = NULL; | |
446fda4f | 941 | |
02752760 | 942 | if (doi_def->type == CIPSO_V4_MAP_STD) { |
044a68ed PM |
943 | net_cat_size = doi_def->map.std->cat.cipso_size; |
944 | net_cat_array = doi_def->map.std->cat.cipso; | |
02752760 | 945 | } |
446fda4f | 946 | |
02752760 PM |
947 | for (;;) { |
948 | net_spot = cipso_v4_bitmap_walk(net_cat, | |
949 | net_clen_bits, | |
950 | net_spot + 1, | |
951 | 1); | |
952 | if (net_spot < 0) { | |
953 | if (net_spot == -2) | |
954 | return -EFAULT; | |
955 | return 0; | |
956 | } | |
957 | ||
958 | switch (doi_def->type) { | |
959 | case CIPSO_V4_MAP_PASS: | |
960 | host_spot = net_spot; | |
961 | break; | |
962 | case CIPSO_V4_MAP_STD: | |
963 | if (net_spot >= net_cat_size) | |
964 | return -EPERM; | |
446fda4f | 965 | host_spot = net_cat_array[net_spot]; |
9fade4bf PM |
966 | if (host_spot >= CIPSO_V4_INV_CAT) |
967 | return -EPERM; | |
02752760 | 968 | break; |
446fda4f | 969 | } |
02752760 PM |
970 | ret_val = netlbl_secattr_catmap_setbit(secattr->mls_cat, |
971 | host_spot, | |
972 | GFP_ATOMIC); | |
973 | if (ret_val != 0) | |
974 | return ret_val; | |
446fda4f PM |
975 | } |
976 | ||
977 | return -EINVAL; | |
978 | } | |
979 | ||
654bbc2a PM |
980 | /** |
981 | * cipso_v4_map_cat_enum_valid - Checks to see if the categories are valid | |
982 | * @doi_def: the DOI definition | |
983 | * @enumcat: category list | |
984 | * @enumcat_len: length of the category list in bytes | |
985 | * | |
986 | * Description: | |
987 | * Checks the given categories against the given DOI definition and returns a | |
988 | * negative value if any of the categories do not have a valid mapping and a | |
989 | * zero value if all of the categories are valid. | |
990 | * | |
991 | */ | |
992 | static int cipso_v4_map_cat_enum_valid(const struct cipso_v4_doi *doi_def, | |
993 | const unsigned char *enumcat, | |
994 | u32 enumcat_len) | |
995 | { | |
996 | u16 cat; | |
997 | int cat_prev = -1; | |
998 | u32 iter; | |
999 | ||
1000 | if (doi_def->type != CIPSO_V4_MAP_PASS || enumcat_len & 0x01) | |
1001 | return -EFAULT; | |
1002 | ||
1003 | for (iter = 0; iter < enumcat_len; iter += 2) { | |
50e5d35c | 1004 | cat = ntohs(get_unaligned((__be16 *)&enumcat[iter])); |
654bbc2a PM |
1005 | if (cat <= cat_prev) |
1006 | return -EFAULT; | |
1007 | cat_prev = cat; | |
1008 | } | |
1009 | ||
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | /** | |
1014 | * cipso_v4_map_cat_enum_hton - Perform a category mapping from host to network | |
1015 | * @doi_def: the DOI definition | |
1016 | * @secattr: the security attributes | |
1017 | * @net_cat: the zero'd out category list in network/CIPSO format | |
1018 | * @net_cat_len: the length of the CIPSO category list in bytes | |
1019 | * | |
1020 | * Description: | |
1021 | * Perform a label mapping to translate a local MLS category bitmap to the | |
1022 | * correct CIPSO category list using the given DOI definition. Returns the | |
1023 | * size in bytes of the network category bitmap on success, negative values | |
1024 | * otherwise. | |
1025 | * | |
1026 | */ | |
1027 | static int cipso_v4_map_cat_enum_hton(const struct cipso_v4_doi *doi_def, | |
1028 | const struct netlbl_lsm_secattr *secattr, | |
1029 | unsigned char *net_cat, | |
1030 | u32 net_cat_len) | |
1031 | { | |
1032 | int cat = -1; | |
1033 | u32 cat_iter = 0; | |
1034 | ||
1035 | for (;;) { | |
1036 | cat = netlbl_secattr_catmap_walk(secattr->mls_cat, cat + 1); | |
1037 | if (cat < 0) | |
1038 | break; | |
1039 | if ((cat_iter + 2) > net_cat_len) | |
1040 | return -ENOSPC; | |
1041 | ||
1042 | *((__be16 *)&net_cat[cat_iter]) = htons(cat); | |
1043 | cat_iter += 2; | |
1044 | } | |
1045 | ||
1046 | return cat_iter; | |
1047 | } | |
1048 | ||
1049 | /** | |
1050 | * cipso_v4_map_cat_enum_ntoh - Perform a category mapping from network to host | |
1051 | * @doi_def: the DOI definition | |
1052 | * @net_cat: the category list in network/CIPSO format | |
1053 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
1054 | * @secattr: the security attributes | |
1055 | * | |
1056 | * Description: | |
1057 | * Perform a label mapping to translate a CIPSO category list to the correct | |
1058 | * local MLS category bitmap using the given DOI definition. Returns zero on | |
1059 | * success, negative values on failure. | |
1060 | * | |
1061 | */ | |
1062 | static int cipso_v4_map_cat_enum_ntoh(const struct cipso_v4_doi *doi_def, | |
1063 | const unsigned char *net_cat, | |
1064 | u32 net_cat_len, | |
1065 | struct netlbl_lsm_secattr *secattr) | |
1066 | { | |
1067 | int ret_val; | |
1068 | u32 iter; | |
1069 | ||
1070 | for (iter = 0; iter < net_cat_len; iter += 2) { | |
1071 | ret_val = netlbl_secattr_catmap_setbit(secattr->mls_cat, | |
50e5d35c PM |
1072 | ntohs(get_unaligned((__be16 *)&net_cat[iter])), |
1073 | GFP_ATOMIC); | |
654bbc2a PM |
1074 | if (ret_val != 0) |
1075 | return ret_val; | |
1076 | } | |
1077 | ||
1078 | return 0; | |
1079 | } | |
1080 | ||
484b3669 PM |
1081 | /** |
1082 | * cipso_v4_map_cat_rng_valid - Checks to see if the categories are valid | |
1083 | * @doi_def: the DOI definition | |
1084 | * @rngcat: category list | |
1085 | * @rngcat_len: length of the category list in bytes | |
1086 | * | |
1087 | * Description: | |
1088 | * Checks the given categories against the given DOI definition and returns a | |
1089 | * negative value if any of the categories do not have a valid mapping and a | |
1090 | * zero value if all of the categories are valid. | |
1091 | * | |
1092 | */ | |
1093 | static int cipso_v4_map_cat_rng_valid(const struct cipso_v4_doi *doi_def, | |
1094 | const unsigned char *rngcat, | |
1095 | u32 rngcat_len) | |
1096 | { | |
1097 | u16 cat_high; | |
1098 | u16 cat_low; | |
1099 | u32 cat_prev = CIPSO_V4_MAX_REM_CATS + 1; | |
1100 | u32 iter; | |
1101 | ||
1102 | if (doi_def->type != CIPSO_V4_MAP_PASS || rngcat_len & 0x01) | |
1103 | return -EFAULT; | |
1104 | ||
1105 | for (iter = 0; iter < rngcat_len; iter += 4) { | |
50e5d35c | 1106 | cat_high = ntohs(get_unaligned((__be16 *)&rngcat[iter])); |
484b3669 | 1107 | if ((iter + 4) <= rngcat_len) |
50e5d35c PM |
1108 | cat_low = ntohs( |
1109 | get_unaligned((__be16 *)&rngcat[iter + 2])); | |
484b3669 PM |
1110 | else |
1111 | cat_low = 0; | |
1112 | ||
1113 | if (cat_high > cat_prev) | |
1114 | return -EFAULT; | |
1115 | ||
1116 | cat_prev = cat_low; | |
1117 | } | |
1118 | ||
1119 | return 0; | |
1120 | } | |
1121 | ||
1122 | /** | |
1123 | * cipso_v4_map_cat_rng_hton - Perform a category mapping from host to network | |
1124 | * @doi_def: the DOI definition | |
1125 | * @secattr: the security attributes | |
1126 | * @net_cat: the zero'd out category list in network/CIPSO format | |
1127 | * @net_cat_len: the length of the CIPSO category list in bytes | |
1128 | * | |
1129 | * Description: | |
1130 | * Perform a label mapping to translate a local MLS category bitmap to the | |
1131 | * correct CIPSO category list using the given DOI definition. Returns the | |
1132 | * size in bytes of the network category bitmap on success, negative values | |
1133 | * otherwise. | |
1134 | * | |
1135 | */ | |
1136 | static int cipso_v4_map_cat_rng_hton(const struct cipso_v4_doi *doi_def, | |
1137 | const struct netlbl_lsm_secattr *secattr, | |
1138 | unsigned char *net_cat, | |
1139 | u32 net_cat_len) | |
1140 | { | |
484b3669 | 1141 | int iter = -1; |
f998e8cb | 1142 | u16 array[CIPSO_V4_TAG_RNG_CAT_MAX * 2]; |
484b3669 PM |
1143 | u32 array_cnt = 0; |
1144 | u32 cat_size = 0; | |
1145 | ||
f998e8cb | 1146 | /* make sure we don't overflow the 'array[]' variable */ |
128c6b6c PM |
1147 | if (net_cat_len > |
1148 | (CIPSO_V4_OPT_LEN_MAX - CIPSO_V4_HDR_LEN - CIPSO_V4_TAG_RNG_BLEN)) | |
1149 | return -ENOSPC; | |
484b3669 PM |
1150 | |
1151 | for (;;) { | |
1152 | iter = netlbl_secattr_catmap_walk(secattr->mls_cat, iter + 1); | |
1153 | if (iter < 0) | |
1154 | break; | |
1155 | cat_size += (iter == 0 ? 0 : sizeof(u16)); | |
1156 | if (cat_size > net_cat_len) | |
1157 | return -ENOSPC; | |
1158 | array[array_cnt++] = iter; | |
1159 | ||
1160 | iter = netlbl_secattr_catmap_walk_rng(secattr->mls_cat, iter); | |
1161 | if (iter < 0) | |
1162 | return -EFAULT; | |
1163 | cat_size += sizeof(u16); | |
1164 | if (cat_size > net_cat_len) | |
1165 | return -ENOSPC; | |
1166 | array[array_cnt++] = iter; | |
1167 | } | |
1168 | ||
1169 | for (iter = 0; array_cnt > 0;) { | |
1170 | *((__be16 *)&net_cat[iter]) = htons(array[--array_cnt]); | |
1171 | iter += 2; | |
1172 | array_cnt--; | |
1173 | if (array[array_cnt] != 0) { | |
1174 | *((__be16 *)&net_cat[iter]) = htons(array[array_cnt]); | |
1175 | iter += 2; | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | return cat_size; | |
1180 | } | |
1181 | ||
1182 | /** | |
1183 | * cipso_v4_map_cat_rng_ntoh - Perform a category mapping from network to host | |
1184 | * @doi_def: the DOI definition | |
1185 | * @net_cat: the category list in network/CIPSO format | |
1186 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
1187 | * @secattr: the security attributes | |
1188 | * | |
1189 | * Description: | |
1190 | * Perform a label mapping to translate a CIPSO category list to the correct | |
1191 | * local MLS category bitmap using the given DOI definition. Returns zero on | |
1192 | * success, negative values on failure. | |
1193 | * | |
1194 | */ | |
1195 | static int cipso_v4_map_cat_rng_ntoh(const struct cipso_v4_doi *doi_def, | |
1196 | const unsigned char *net_cat, | |
1197 | u32 net_cat_len, | |
1198 | struct netlbl_lsm_secattr *secattr) | |
1199 | { | |
1200 | int ret_val; | |
1201 | u32 net_iter; | |
1202 | u16 cat_low; | |
1203 | u16 cat_high; | |
1204 | ||
132adf54 | 1205 | for (net_iter = 0; net_iter < net_cat_len; net_iter += 4) { |
50e5d35c | 1206 | cat_high = ntohs(get_unaligned((__be16 *)&net_cat[net_iter])); |
484b3669 | 1207 | if ((net_iter + 4) <= net_cat_len) |
50e5d35c PM |
1208 | cat_low = ntohs( |
1209 | get_unaligned((__be16 *)&net_cat[net_iter + 2])); | |
484b3669 PM |
1210 | else |
1211 | cat_low = 0; | |
1212 | ||
1213 | ret_val = netlbl_secattr_catmap_setrng(secattr->mls_cat, | |
1214 | cat_low, | |
1215 | cat_high, | |
1216 | GFP_ATOMIC); | |
1217 | if (ret_val != 0) | |
1218 | return ret_val; | |
1219 | } | |
1220 | ||
1221 | return 0; | |
1222 | } | |
1223 | ||
446fda4f PM |
1224 | /* |
1225 | * Protocol Handling Functions | |
1226 | */ | |
1227 | ||
446fda4f PM |
1228 | /** |
1229 | * cipso_v4_gentag_hdr - Generate a CIPSO option header | |
1230 | * @doi_def: the DOI definition | |
91b1ed0a | 1231 | * @len: the total tag length in bytes, not including this header |
446fda4f PM |
1232 | * @buf: the CIPSO option buffer |
1233 | * | |
1234 | * Description: | |
91b1ed0a | 1235 | * Write a CIPSO header into the beginning of @buffer. |
446fda4f PM |
1236 | * |
1237 | */ | |
91b1ed0a PM |
1238 | static void cipso_v4_gentag_hdr(const struct cipso_v4_doi *doi_def, |
1239 | unsigned char *buf, | |
1240 | u32 len) | |
446fda4f | 1241 | { |
446fda4f PM |
1242 | buf[0] = IPOPT_CIPSO; |
1243 | buf[1] = CIPSO_V4_HDR_LEN + len; | |
714e85be | 1244 | *(__be32 *)&buf[2] = htonl(doi_def->doi); |
446fda4f PM |
1245 | } |
1246 | ||
446fda4f PM |
1247 | /** |
1248 | * cipso_v4_gentag_rbm - Generate a CIPSO restricted bitmap tag (type #1) | |
1249 | * @doi_def: the DOI definition | |
1250 | * @secattr: the security attributes | |
1251 | * @buffer: the option buffer | |
1252 | * @buffer_len: length of buffer in bytes | |
1253 | * | |
1254 | * Description: | |
1255 | * Generate a CIPSO option using the restricted bitmap tag, tag type #1. The | |
1256 | * actual buffer length may be larger than the indicated size due to | |
91b1ed0a PM |
1257 | * translation between host and network category bitmaps. Returns the size of |
1258 | * the tag on success, negative values on failure. | |
446fda4f PM |
1259 | * |
1260 | */ | |
1261 | static int cipso_v4_gentag_rbm(const struct cipso_v4_doi *doi_def, | |
1262 | const struct netlbl_lsm_secattr *secattr, | |
91b1ed0a PM |
1263 | unsigned char *buffer, |
1264 | u32 buffer_len) | |
446fda4f | 1265 | { |
701a90ba | 1266 | int ret_val; |
91b1ed0a | 1267 | u32 tag_len; |
446fda4f PM |
1268 | u32 level; |
1269 | ||
701a90ba PM |
1270 | if ((secattr->flags & NETLBL_SECATTR_MLS_LVL) == 0) |
1271 | return -EPERM; | |
1272 | ||
91b1ed0a PM |
1273 | ret_val = cipso_v4_map_lvl_hton(doi_def, secattr->mls_lvl, &level); |
1274 | if (ret_val != 0) | |
1275 | return ret_val; | |
446fda4f | 1276 | |
91b1ed0a | 1277 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
446fda4f | 1278 | ret_val = cipso_v4_map_cat_rbm_hton(doi_def, |
02752760 | 1279 | secattr, |
91b1ed0a PM |
1280 | &buffer[4], |
1281 | buffer_len - 4); | |
446fda4f | 1282 | if (ret_val < 0) |
91b1ed0a | 1283 | return ret_val; |
446fda4f PM |
1284 | |
1285 | /* This will send packets using the "optimized" format when | |
1286 | * possibile as specified in section 3.4.2.6 of the | |
1287 | * CIPSO draft. */ | |
701a90ba | 1288 | if (cipso_v4_rbm_optfmt && ret_val > 0 && ret_val <= 10) |
91b1ed0a | 1289 | tag_len = 14; |
701a90ba | 1290 | else |
91b1ed0a PM |
1291 | tag_len = 4 + ret_val; |
1292 | } else | |
1293 | tag_len = 4; | |
446fda4f | 1294 | |
91b1ed0a PM |
1295 | buffer[0] = 0x01; |
1296 | buffer[1] = tag_len; | |
1297 | buffer[3] = level; | |
446fda4f | 1298 | |
91b1ed0a | 1299 | return tag_len; |
446fda4f PM |
1300 | } |
1301 | ||
1302 | /** | |
1303 | * cipso_v4_parsetag_rbm - Parse a CIPSO restricted bitmap tag | |
1304 | * @doi_def: the DOI definition | |
1305 | * @tag: the CIPSO tag | |
1306 | * @secattr: the security attributes | |
1307 | * | |
1308 | * Description: | |
1309 | * Parse a CIPSO restricted bitmap tag (tag type #1) and return the security | |
1310 | * attributes in @secattr. Return zero on success, negatives values on | |
1311 | * failure. | |
1312 | * | |
1313 | */ | |
1314 | static int cipso_v4_parsetag_rbm(const struct cipso_v4_doi *doi_def, | |
1315 | const unsigned char *tag, | |
1316 | struct netlbl_lsm_secattr *secattr) | |
1317 | { | |
1318 | int ret_val; | |
1319 | u8 tag_len = tag[1]; | |
1320 | u32 level; | |
1321 | ||
1322 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); | |
1323 | if (ret_val != 0) | |
1324 | return ret_val; | |
1325 | secattr->mls_lvl = level; | |
701a90ba | 1326 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
446fda4f PM |
1327 | |
1328 | if (tag_len > 4) { | |
02752760 | 1329 | secattr->mls_cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); |
446fda4f PM |
1330 | if (secattr->mls_cat == NULL) |
1331 | return -ENOMEM; | |
1332 | ||
1333 | ret_val = cipso_v4_map_cat_rbm_ntoh(doi_def, | |
1334 | &tag[4], | |
1335 | tag_len - 4, | |
02752760 PM |
1336 | secattr); |
1337 | if (ret_val != 0) { | |
1338 | netlbl_secattr_catmap_free(secattr->mls_cat); | |
446fda4f PM |
1339 | return ret_val; |
1340 | } | |
02752760 PM |
1341 | |
1342 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
446fda4f PM |
1343 | } |
1344 | ||
1345 | return 0; | |
1346 | } | |
1347 | ||
654bbc2a PM |
1348 | /** |
1349 | * cipso_v4_gentag_enum - Generate a CIPSO enumerated tag (type #2) | |
1350 | * @doi_def: the DOI definition | |
1351 | * @secattr: the security attributes | |
1352 | * @buffer: the option buffer | |
1353 | * @buffer_len: length of buffer in bytes | |
1354 | * | |
1355 | * Description: | |
1356 | * Generate a CIPSO option using the enumerated tag, tag type #2. Returns the | |
1357 | * size of the tag on success, negative values on failure. | |
1358 | * | |
1359 | */ | |
1360 | static int cipso_v4_gentag_enum(const struct cipso_v4_doi *doi_def, | |
1361 | const struct netlbl_lsm_secattr *secattr, | |
1362 | unsigned char *buffer, | |
1363 | u32 buffer_len) | |
1364 | { | |
1365 | int ret_val; | |
1366 | u32 tag_len; | |
1367 | u32 level; | |
1368 | ||
1369 | if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL)) | |
1370 | return -EPERM; | |
1371 | ||
1372 | ret_val = cipso_v4_map_lvl_hton(doi_def, secattr->mls_lvl, &level); | |
1373 | if (ret_val != 0) | |
1374 | return ret_val; | |
1375 | ||
1376 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { | |
1377 | ret_val = cipso_v4_map_cat_enum_hton(doi_def, | |
1378 | secattr, | |
1379 | &buffer[4], | |
1380 | buffer_len - 4); | |
1381 | if (ret_val < 0) | |
1382 | return ret_val; | |
1383 | ||
1384 | tag_len = 4 + ret_val; | |
1385 | } else | |
1386 | tag_len = 4; | |
1387 | ||
1388 | buffer[0] = 0x02; | |
1389 | buffer[1] = tag_len; | |
1390 | buffer[3] = level; | |
1391 | ||
1392 | return tag_len; | |
1393 | } | |
1394 | ||
1395 | /** | |
1396 | * cipso_v4_parsetag_enum - Parse a CIPSO enumerated tag | |
1397 | * @doi_def: the DOI definition | |
1398 | * @tag: the CIPSO tag | |
1399 | * @secattr: the security attributes | |
1400 | * | |
1401 | * Description: | |
1402 | * Parse a CIPSO enumerated tag (tag type #2) and return the security | |
1403 | * attributes in @secattr. Return zero on success, negatives values on | |
1404 | * failure. | |
1405 | * | |
1406 | */ | |
1407 | static int cipso_v4_parsetag_enum(const struct cipso_v4_doi *doi_def, | |
1408 | const unsigned char *tag, | |
1409 | struct netlbl_lsm_secattr *secattr) | |
1410 | { | |
1411 | int ret_val; | |
1412 | u8 tag_len = tag[1]; | |
1413 | u32 level; | |
1414 | ||
1415 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); | |
1416 | if (ret_val != 0) | |
1417 | return ret_val; | |
1418 | secattr->mls_lvl = level; | |
1419 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; | |
1420 | ||
1421 | if (tag_len > 4) { | |
1422 | secattr->mls_cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1423 | if (secattr->mls_cat == NULL) | |
1424 | return -ENOMEM; | |
1425 | ||
1426 | ret_val = cipso_v4_map_cat_enum_ntoh(doi_def, | |
1427 | &tag[4], | |
1428 | tag_len - 4, | |
1429 | secattr); | |
1430 | if (ret_val != 0) { | |
1431 | netlbl_secattr_catmap_free(secattr->mls_cat); | |
1432 | return ret_val; | |
1433 | } | |
1434 | ||
1435 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
1436 | } | |
1437 | ||
1438 | return 0; | |
1439 | } | |
1440 | ||
484b3669 PM |
1441 | /** |
1442 | * cipso_v4_gentag_rng - Generate a CIPSO ranged tag (type #5) | |
1443 | * @doi_def: the DOI definition | |
1444 | * @secattr: the security attributes | |
1445 | * @buffer: the option buffer | |
1446 | * @buffer_len: length of buffer in bytes | |
1447 | * | |
1448 | * Description: | |
1449 | * Generate a CIPSO option using the ranged tag, tag type #5. Returns the | |
1450 | * size of the tag on success, negative values on failure. | |
1451 | * | |
1452 | */ | |
1453 | static int cipso_v4_gentag_rng(const struct cipso_v4_doi *doi_def, | |
1454 | const struct netlbl_lsm_secattr *secattr, | |
1455 | unsigned char *buffer, | |
1456 | u32 buffer_len) | |
1457 | { | |
1458 | int ret_val; | |
1459 | u32 tag_len; | |
1460 | u32 level; | |
1461 | ||
1462 | if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL)) | |
1463 | return -EPERM; | |
1464 | ||
1465 | ret_val = cipso_v4_map_lvl_hton(doi_def, secattr->mls_lvl, &level); | |
1466 | if (ret_val != 0) | |
1467 | return ret_val; | |
1468 | ||
1469 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { | |
1470 | ret_val = cipso_v4_map_cat_rng_hton(doi_def, | |
1471 | secattr, | |
1472 | &buffer[4], | |
1473 | buffer_len - 4); | |
1474 | if (ret_val < 0) | |
1475 | return ret_val; | |
1476 | ||
1477 | tag_len = 4 + ret_val; | |
1478 | } else | |
1479 | tag_len = 4; | |
1480 | ||
1481 | buffer[0] = 0x05; | |
1482 | buffer[1] = tag_len; | |
1483 | buffer[3] = level; | |
1484 | ||
1485 | return tag_len; | |
1486 | } | |
1487 | ||
1488 | /** | |
1489 | * cipso_v4_parsetag_rng - Parse a CIPSO ranged tag | |
1490 | * @doi_def: the DOI definition | |
1491 | * @tag: the CIPSO tag | |
1492 | * @secattr: the security attributes | |
1493 | * | |
1494 | * Description: | |
1495 | * Parse a CIPSO ranged tag (tag type #5) and return the security attributes | |
1496 | * in @secattr. Return zero on success, negatives values on failure. | |
1497 | * | |
1498 | */ | |
1499 | static int cipso_v4_parsetag_rng(const struct cipso_v4_doi *doi_def, | |
1500 | const unsigned char *tag, | |
1501 | struct netlbl_lsm_secattr *secattr) | |
1502 | { | |
1503 | int ret_val; | |
1504 | u8 tag_len = tag[1]; | |
1505 | u32 level; | |
1506 | ||
1507 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); | |
1508 | if (ret_val != 0) | |
1509 | return ret_val; | |
1510 | secattr->mls_lvl = level; | |
1511 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; | |
1512 | ||
1513 | if (tag_len > 4) { | |
1514 | secattr->mls_cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1515 | if (secattr->mls_cat == NULL) | |
1516 | return -ENOMEM; | |
1517 | ||
1518 | ret_val = cipso_v4_map_cat_rng_ntoh(doi_def, | |
1519 | &tag[4], | |
1520 | tag_len - 4, | |
1521 | secattr); | |
1522 | if (ret_val != 0) { | |
1523 | netlbl_secattr_catmap_free(secattr->mls_cat); | |
1524 | return ret_val; | |
1525 | } | |
1526 | ||
1527 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
1528 | } | |
1529 | ||
1530 | return 0; | |
1531 | } | |
1532 | ||
446fda4f PM |
1533 | /** |
1534 | * cipso_v4_validate - Validate a CIPSO option | |
1535 | * @option: the start of the option, on error it is set to point to the error | |
1536 | * | |
1537 | * Description: | |
1538 | * This routine is called to validate a CIPSO option, it checks all of the | |
1539 | * fields to ensure that they are at least valid, see the draft snippet below | |
1540 | * for details. If the option is valid then a zero value is returned and | |
1541 | * the value of @option is unchanged. If the option is invalid then a | |
1542 | * non-zero value is returned and @option is adjusted to point to the | |
1543 | * offending portion of the option. From the IETF draft ... | |
1544 | * | |
1545 | * "If any field within the CIPSO options, such as the DOI identifier, is not | |
1546 | * recognized the IP datagram is discarded and an ICMP 'parameter problem' | |
1547 | * (type 12) is generated and returned. The ICMP code field is set to 'bad | |
1548 | * parameter' (code 0) and the pointer is set to the start of the CIPSO field | |
1549 | * that is unrecognized." | |
1550 | * | |
1551 | */ | |
1552 | int cipso_v4_validate(unsigned char **option) | |
1553 | { | |
1554 | unsigned char *opt = *option; | |
1555 | unsigned char *tag; | |
1556 | unsigned char opt_iter; | |
1557 | unsigned char err_offset = 0; | |
1558 | u8 opt_len; | |
1559 | u8 tag_len; | |
1560 | struct cipso_v4_doi *doi_def = NULL; | |
1561 | u32 tag_iter; | |
1562 | ||
1563 | /* caller already checks for length values that are too large */ | |
1564 | opt_len = opt[1]; | |
1565 | if (opt_len < 8) { | |
1566 | err_offset = 1; | |
1567 | goto validate_return; | |
1568 | } | |
1569 | ||
1570 | rcu_read_lock(); | |
50e5d35c | 1571 | doi_def = cipso_v4_doi_search(ntohl(get_unaligned((__be32 *)&opt[2]))); |
446fda4f PM |
1572 | if (doi_def == NULL) { |
1573 | err_offset = 2; | |
1574 | goto validate_return_locked; | |
1575 | } | |
1576 | ||
1577 | opt_iter = 6; | |
1578 | tag = opt + opt_iter; | |
1579 | while (opt_iter < opt_len) { | |
1580 | for (tag_iter = 0; doi_def->tags[tag_iter] != tag[0];) | |
1581 | if (doi_def->tags[tag_iter] == CIPSO_V4_TAG_INVALID || | |
1582 | ++tag_iter == CIPSO_V4_TAG_MAXCNT) { | |
1583 | err_offset = opt_iter; | |
1584 | goto validate_return_locked; | |
1585 | } | |
1586 | ||
1587 | tag_len = tag[1]; | |
1588 | if (tag_len > (opt_len - opt_iter)) { | |
1589 | err_offset = opt_iter + 1; | |
1590 | goto validate_return_locked; | |
1591 | } | |
1592 | ||
1593 | switch (tag[0]) { | |
1594 | case CIPSO_V4_TAG_RBITMAP: | |
1595 | if (tag_len < 4) { | |
1596 | err_offset = opt_iter + 1; | |
1597 | goto validate_return_locked; | |
1598 | } | |
1599 | ||
1600 | /* We are already going to do all the verification | |
1601 | * necessary at the socket layer so from our point of | |
1602 | * view it is safe to turn these checks off (and less | |
1603 | * work), however, the CIPSO draft says we should do | |
1604 | * all the CIPSO validations here but it doesn't | |
1605 | * really specify _exactly_ what we need to validate | |
1606 | * ... so, just make it a sysctl tunable. */ | |
1607 | if (cipso_v4_rbm_strictvalid) { | |
1608 | if (cipso_v4_map_lvl_valid(doi_def, | |
1609 | tag[3]) < 0) { | |
1610 | err_offset = opt_iter + 3; | |
1611 | goto validate_return_locked; | |
1612 | } | |
1613 | if (tag_len > 4 && | |
1614 | cipso_v4_map_cat_rbm_valid(doi_def, | |
1615 | &tag[4], | |
1616 | tag_len - 4) < 0) { | |
1617 | err_offset = opt_iter + 4; | |
1618 | goto validate_return_locked; | |
1619 | } | |
1620 | } | |
1621 | break; | |
654bbc2a PM |
1622 | case CIPSO_V4_TAG_ENUM: |
1623 | if (tag_len < 4) { | |
1624 | err_offset = opt_iter + 1; | |
1625 | goto validate_return_locked; | |
1626 | } | |
1627 | ||
1628 | if (cipso_v4_map_lvl_valid(doi_def, | |
1629 | tag[3]) < 0) { | |
1630 | err_offset = opt_iter + 3; | |
1631 | goto validate_return_locked; | |
1632 | } | |
1633 | if (tag_len > 4 && | |
1634 | cipso_v4_map_cat_enum_valid(doi_def, | |
1635 | &tag[4], | |
1636 | tag_len - 4) < 0) { | |
1637 | err_offset = opt_iter + 4; | |
1638 | goto validate_return_locked; | |
1639 | } | |
1640 | break; | |
484b3669 PM |
1641 | case CIPSO_V4_TAG_RANGE: |
1642 | if (tag_len < 4) { | |
1643 | err_offset = opt_iter + 1; | |
1644 | goto validate_return_locked; | |
1645 | } | |
1646 | ||
1647 | if (cipso_v4_map_lvl_valid(doi_def, | |
1648 | tag[3]) < 0) { | |
1649 | err_offset = opt_iter + 3; | |
1650 | goto validate_return_locked; | |
1651 | } | |
1652 | if (tag_len > 4 && | |
1653 | cipso_v4_map_cat_rng_valid(doi_def, | |
1654 | &tag[4], | |
1655 | tag_len - 4) < 0) { | |
1656 | err_offset = opt_iter + 4; | |
1657 | goto validate_return_locked; | |
1658 | } | |
1659 | break; | |
446fda4f PM |
1660 | default: |
1661 | err_offset = opt_iter; | |
1662 | goto validate_return_locked; | |
1663 | } | |
1664 | ||
1665 | tag += tag_len; | |
1666 | opt_iter += tag_len; | |
1667 | } | |
1668 | ||
1669 | validate_return_locked: | |
1670 | rcu_read_unlock(); | |
1671 | validate_return: | |
1672 | *option = opt + err_offset; | |
1673 | return err_offset; | |
1674 | } | |
1675 | ||
1676 | /** | |
1677 | * cipso_v4_error - Send the correct reponse for a bad packet | |
1678 | * @skb: the packet | |
1679 | * @error: the error code | |
1680 | * @gateway: CIPSO gateway flag | |
1681 | * | |
1682 | * Description: | |
1683 | * Based on the error code given in @error, send an ICMP error message back to | |
1684 | * the originating host. From the IETF draft ... | |
1685 | * | |
1686 | * "If the contents of the CIPSO [option] are valid but the security label is | |
1687 | * outside of the configured host or port label range, the datagram is | |
1688 | * discarded and an ICMP 'destination unreachable' (type 3) is generated and | |
1689 | * returned. The code field of the ICMP is set to 'communication with | |
1690 | * destination network administratively prohibited' (code 9) or to | |
1691 | * 'communication with destination host administratively prohibited' | |
1692 | * (code 10). The value of the code is dependent on whether the originator | |
1693 | * of the ICMP message is acting as a CIPSO host or a CIPSO gateway. The | |
1694 | * recipient of the ICMP message MUST be able to handle either value. The | |
1695 | * same procedure is performed if a CIPSO [option] can not be added to an | |
1696 | * IP packet because it is too large to fit in the IP options area." | |
1697 | * | |
1698 | * "If the error is triggered by receipt of an ICMP message, the message is | |
1699 | * discarded and no response is permitted (consistent with general ICMP | |
1700 | * processing rules)." | |
1701 | * | |
1702 | */ | |
1703 | void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway) | |
1704 | { | |
eddc9ec5 | 1705 | if (ip_hdr(skb)->protocol == IPPROTO_ICMP || error != -EACCES) |
446fda4f PM |
1706 | return; |
1707 | ||
1708 | if (gateway) | |
1709 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_NET_ANO, 0); | |
1710 | else | |
1711 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_ANO, 0); | |
1712 | } | |
1713 | ||
1714 | /** | |
ba6ff9f2 PM |
1715 | * cipso_v4_sock_setattr - Add a CIPSO option to a socket |
1716 | * @sk: the socket | |
446fda4f PM |
1717 | * @doi_def: the CIPSO DOI to use |
1718 | * @secattr: the specific security attributes of the socket | |
1719 | * | |
1720 | * Description: | |
1721 | * Set the CIPSO option on the given socket using the DOI definition and | |
1722 | * security attributes passed to the function. This function requires | |
ba6ff9f2 PM |
1723 | * exclusive access to @sk, which means it either needs to be in the |
1724 | * process of being created or locked. Returns zero on success and negative | |
1725 | * values on failure. | |
446fda4f PM |
1726 | * |
1727 | */ | |
ba6ff9f2 PM |
1728 | int cipso_v4_sock_setattr(struct sock *sk, |
1729 | const struct cipso_v4_doi *doi_def, | |
1730 | const struct netlbl_lsm_secattr *secattr) | |
446fda4f PM |
1731 | { |
1732 | int ret_val = -EPERM; | |
1733 | u32 iter; | |
91b1ed0a | 1734 | unsigned char *buf; |
446fda4f PM |
1735 | u32 buf_len = 0; |
1736 | u32 opt_len; | |
1737 | struct ip_options *opt = NULL; | |
446fda4f PM |
1738 | struct inet_sock *sk_inet; |
1739 | struct inet_connection_sock *sk_conn; | |
1740 | ||
1741 | /* In the case of sock_create_lite(), the sock->sk field is not | |
1742 | * defined yet but it is not a problem as the only users of these | |
1743 | * "lite" PF_INET sockets are functions which do an accept() call | |
1744 | * afterwards so we will label the socket as part of the accept(). */ | |
446fda4f PM |
1745 | if (sk == NULL) |
1746 | return 0; | |
1747 | ||
91b1ed0a PM |
1748 | /* We allocate the maximum CIPSO option size here so we are probably |
1749 | * being a little wasteful, but it makes our life _much_ easier later | |
1750 | * on and after all we are only talking about 40 bytes. */ | |
1751 | buf_len = CIPSO_V4_OPT_LEN_MAX; | |
1752 | buf = kmalloc(buf_len, GFP_ATOMIC); | |
1753 | if (buf == NULL) { | |
1754 | ret_val = -ENOMEM; | |
1755 | goto socket_setattr_failure; | |
1756 | } | |
1757 | ||
446fda4f PM |
1758 | /* XXX - This code assumes only one tag per CIPSO option which isn't |
1759 | * really a good assumption to make but since we only support the MAC | |
1760 | * tags right now it is a safe assumption. */ | |
1761 | iter = 0; | |
1762 | do { | |
91b1ed0a | 1763 | memset(buf, 0, buf_len); |
446fda4f PM |
1764 | switch (doi_def->tags[iter]) { |
1765 | case CIPSO_V4_TAG_RBITMAP: | |
1766 | ret_val = cipso_v4_gentag_rbm(doi_def, | |
91b1ed0a PM |
1767 | secattr, |
1768 | &buf[CIPSO_V4_HDR_LEN], | |
1769 | buf_len - CIPSO_V4_HDR_LEN); | |
446fda4f | 1770 | break; |
654bbc2a PM |
1771 | case CIPSO_V4_TAG_ENUM: |
1772 | ret_val = cipso_v4_gentag_enum(doi_def, | |
1773 | secattr, | |
1774 | &buf[CIPSO_V4_HDR_LEN], | |
1775 | buf_len - CIPSO_V4_HDR_LEN); | |
1776 | break; | |
484b3669 PM |
1777 | case CIPSO_V4_TAG_RANGE: |
1778 | ret_val = cipso_v4_gentag_rng(doi_def, | |
1779 | secattr, | |
1780 | &buf[CIPSO_V4_HDR_LEN], | |
1781 | buf_len - CIPSO_V4_HDR_LEN); | |
1782 | break; | |
446fda4f PM |
1783 | default: |
1784 | ret_val = -EPERM; | |
1785 | goto socket_setattr_failure; | |
1786 | } | |
1787 | ||
1788 | iter++; | |
91b1ed0a | 1789 | } while (ret_val < 0 && |
446fda4f PM |
1790 | iter < CIPSO_V4_TAG_MAXCNT && |
1791 | doi_def->tags[iter] != CIPSO_V4_TAG_INVALID); | |
91b1ed0a | 1792 | if (ret_val < 0) |
446fda4f | 1793 | goto socket_setattr_failure; |
91b1ed0a PM |
1794 | cipso_v4_gentag_hdr(doi_def, buf, ret_val); |
1795 | buf_len = CIPSO_V4_HDR_LEN + ret_val; | |
446fda4f PM |
1796 | |
1797 | /* We can't use ip_options_get() directly because it makes a call to | |
1798 | * ip_options_get_alloc() which allocates memory with GFP_KERNEL and | |
f8687afe PM |
1799 | * we won't always have CAP_NET_RAW even though we _always_ want to |
1800 | * set the IPOPT_CIPSO option. */ | |
446fda4f PM |
1801 | opt_len = (buf_len + 3) & ~3; |
1802 | opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC); | |
1803 | if (opt == NULL) { | |
1804 | ret_val = -ENOMEM; | |
1805 | goto socket_setattr_failure; | |
1806 | } | |
1807 | memcpy(opt->__data, buf, buf_len); | |
1808 | opt->optlen = opt_len; | |
1809 | opt->is_data = 1; | |
f8687afe | 1810 | opt->cipso = sizeof(struct iphdr); |
446fda4f PM |
1811 | kfree(buf); |
1812 | buf = NULL; | |
446fda4f PM |
1813 | |
1814 | sk_inet = inet_sk(sk); | |
1815 | if (sk_inet->is_icsk) { | |
1816 | sk_conn = inet_csk(sk); | |
1817 | if (sk_inet->opt) | |
1818 | sk_conn->icsk_ext_hdr_len -= sk_inet->opt->optlen; | |
1819 | sk_conn->icsk_ext_hdr_len += opt->optlen; | |
1820 | sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie); | |
1821 | } | |
1822 | opt = xchg(&sk_inet->opt, opt); | |
1823 | kfree(opt); | |
1824 | ||
1825 | return 0; | |
1826 | ||
1827 | socket_setattr_failure: | |
1828 | kfree(buf); | |
1829 | kfree(opt); | |
1830 | return ret_val; | |
1831 | } | |
1832 | ||
1833 | /** | |
14a72f53 PM |
1834 | * cipso_v4_sock_getattr - Get the security attributes from a sock |
1835 | * @sk: the sock | |
446fda4f PM |
1836 | * @secattr: the security attributes |
1837 | * | |
1838 | * Description: | |
14a72f53 PM |
1839 | * Query @sk to see if there is a CIPSO option attached to the sock and if |
1840 | * there is return the CIPSO security attributes in @secattr. This function | |
1841 | * requires that @sk be locked, or privately held, but it does not do any | |
1842 | * locking itself. Returns zero on success and negative values on failure. | |
446fda4f PM |
1843 | * |
1844 | */ | |
14a72f53 | 1845 | int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr) |
446fda4f PM |
1846 | { |
1847 | int ret_val = -ENOMSG; | |
446fda4f PM |
1848 | struct inet_sock *sk_inet; |
1849 | unsigned char *cipso_ptr; | |
1850 | u32 doi; | |
1851 | struct cipso_v4_doi *doi_def; | |
1852 | ||
446fda4f PM |
1853 | sk_inet = inet_sk(sk); |
1854 | if (sk_inet->opt == NULL || sk_inet->opt->cipso == 0) | |
14a72f53 | 1855 | return -ENOMSG; |
446fda4f PM |
1856 | cipso_ptr = sk_inet->opt->__data + sk_inet->opt->cipso - |
1857 | sizeof(struct iphdr); | |
1858 | ret_val = cipso_v4_cache_check(cipso_ptr, cipso_ptr[1], secattr); | |
1859 | if (ret_val == 0) | |
14a72f53 | 1860 | return ret_val; |
446fda4f | 1861 | |
50e5d35c | 1862 | doi = ntohl(get_unaligned((__be32 *)&cipso_ptr[2])); |
446fda4f | 1863 | rcu_read_lock(); |
9bb5fd2b | 1864 | doi_def = cipso_v4_doi_search(doi); |
446fda4f PM |
1865 | if (doi_def == NULL) { |
1866 | rcu_read_unlock(); | |
14a72f53 | 1867 | return -ENOMSG; |
446fda4f | 1868 | } |
91b1ed0a PM |
1869 | |
1870 | /* XXX - This code assumes only one tag per CIPSO option which isn't | |
1871 | * really a good assumption to make but since we only support the MAC | |
1872 | * tags right now it is a safe assumption. */ | |
446fda4f PM |
1873 | switch (cipso_ptr[6]) { |
1874 | case CIPSO_V4_TAG_RBITMAP: | |
1875 | ret_val = cipso_v4_parsetag_rbm(doi_def, | |
1876 | &cipso_ptr[6], | |
1877 | secattr); | |
1878 | break; | |
654bbc2a PM |
1879 | case CIPSO_V4_TAG_ENUM: |
1880 | ret_val = cipso_v4_parsetag_enum(doi_def, | |
1881 | &cipso_ptr[6], | |
1882 | secattr); | |
1883 | break; | |
484b3669 PM |
1884 | case CIPSO_V4_TAG_RANGE: |
1885 | ret_val = cipso_v4_parsetag_rng(doi_def, | |
1886 | &cipso_ptr[6], | |
1887 | secattr); | |
1888 | break; | |
446fda4f PM |
1889 | } |
1890 | rcu_read_unlock(); | |
1891 | ||
14a72f53 PM |
1892 | return ret_val; |
1893 | } | |
1894 | ||
446fda4f PM |
1895 | /** |
1896 | * cipso_v4_skbuff_getattr - Get the security attributes from the CIPSO option | |
1897 | * @skb: the packet | |
1898 | * @secattr: the security attributes | |
1899 | * | |
1900 | * Description: | |
1901 | * Parse the given packet's CIPSO option and return the security attributes. | |
1902 | * Returns zero on success and negative values on failure. | |
1903 | * | |
1904 | */ | |
1905 | int cipso_v4_skbuff_getattr(const struct sk_buff *skb, | |
1906 | struct netlbl_lsm_secattr *secattr) | |
1907 | { | |
1908 | int ret_val = -ENOMSG; | |
1909 | unsigned char *cipso_ptr; | |
1910 | u32 doi; | |
1911 | struct cipso_v4_doi *doi_def; | |
1912 | ||
446fda4f PM |
1913 | cipso_ptr = CIPSO_V4_OPTPTR(skb); |
1914 | if (cipso_v4_cache_check(cipso_ptr, cipso_ptr[1], secattr) == 0) | |
1915 | return 0; | |
1916 | ||
50e5d35c | 1917 | doi = ntohl(get_unaligned((__be32 *)&cipso_ptr[2])); |
446fda4f | 1918 | rcu_read_lock(); |
9bb5fd2b | 1919 | doi_def = cipso_v4_doi_search(doi); |
446fda4f PM |
1920 | if (doi_def == NULL) |
1921 | goto skbuff_getattr_return; | |
91b1ed0a PM |
1922 | |
1923 | /* XXX - This code assumes only one tag per CIPSO option which isn't | |
1924 | * really a good assumption to make but since we only support the MAC | |
1925 | * tags right now it is a safe assumption. */ | |
446fda4f PM |
1926 | switch (cipso_ptr[6]) { |
1927 | case CIPSO_V4_TAG_RBITMAP: | |
1928 | ret_val = cipso_v4_parsetag_rbm(doi_def, | |
1929 | &cipso_ptr[6], | |
1930 | secattr); | |
1931 | break; | |
654bbc2a PM |
1932 | case CIPSO_V4_TAG_ENUM: |
1933 | ret_val = cipso_v4_parsetag_enum(doi_def, | |
1934 | &cipso_ptr[6], | |
1935 | secattr); | |
1936 | break; | |
38c8947c PM |
1937 | case CIPSO_V4_TAG_RANGE: |
1938 | ret_val = cipso_v4_parsetag_rng(doi_def, | |
1939 | &cipso_ptr[6], | |
1940 | secattr); | |
1941 | break; | |
446fda4f PM |
1942 | } |
1943 | ||
1944 | skbuff_getattr_return: | |
1945 | rcu_read_unlock(); | |
1946 | return ret_val; | |
1947 | } | |
1948 | ||
1949 | /* | |
1950 | * Setup Functions | |
1951 | */ | |
1952 | ||
1953 | /** | |
1954 | * cipso_v4_init - Initialize the CIPSO module | |
1955 | * | |
1956 | * Description: | |
1957 | * Initialize the CIPSO module and prepare it for use. Returns zero on success | |
1958 | * and negative values on failure. | |
1959 | * | |
1960 | */ | |
1961 | static int __init cipso_v4_init(void) | |
1962 | { | |
1963 | int ret_val; | |
1964 | ||
1965 | ret_val = cipso_v4_cache_init(); | |
1966 | if (ret_val != 0) | |
1967 | panic("Failed to initialize the CIPSO/IPv4 cache (%d)\n", | |
1968 | ret_val); | |
1969 | ||
1970 | return 0; | |
1971 | } | |
1972 | ||
1973 | subsys_initcall(cipso_v4_init); |