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e114e473 CS |
1 | /* |
2 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation, version 2. | |
7 | * | |
8 | * Author: | |
9 | * Casey Schaufler <casey@schaufler-ca.com> | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/types.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
e114e473 CS |
15 | #include <linux/fs.h> |
16 | #include <linux/sched.h> | |
17 | #include "smack.h" | |
18 | ||
e114e473 | 19 | struct smack_known smack_known_huh = { |
e114e473 CS |
20 | .smk_known = "?", |
21 | .smk_secid = 2, | |
e114e473 CS |
22 | }; |
23 | ||
24 | struct smack_known smack_known_hat = { | |
e114e473 CS |
25 | .smk_known = "^", |
26 | .smk_secid = 3, | |
e114e473 CS |
27 | }; |
28 | ||
29 | struct smack_known smack_known_star = { | |
e114e473 CS |
30 | .smk_known = "*", |
31 | .smk_secid = 4, | |
e114e473 CS |
32 | }; |
33 | ||
34 | struct smack_known smack_known_floor = { | |
e114e473 CS |
35 | .smk_known = "_", |
36 | .smk_secid = 5, | |
e114e473 CS |
37 | }; |
38 | ||
39 | struct smack_known smack_known_invalid = { | |
e114e473 CS |
40 | .smk_known = "", |
41 | .smk_secid = 6, | |
e114e473 CS |
42 | }; |
43 | ||
6d3dc07c | 44 | struct smack_known smack_known_web = { |
6d3dc07c CS |
45 | .smk_known = "@", |
46 | .smk_secid = 7, | |
6d3dc07c CS |
47 | }; |
48 | ||
7198e2ee | 49 | LIST_HEAD(smack_known_list); |
e114e473 CS |
50 | |
51 | /* | |
52 | * The initial value needs to be bigger than any of the | |
53 | * known values above. | |
54 | */ | |
55 | static u32 smack_next_secid = 10; | |
56 | ||
ecfcc53f EB |
57 | /* |
58 | * what events do we log | |
59 | * can be overwritten at run-time by /smack/logging | |
60 | */ | |
61 | int log_policy = SMACK_AUDIT_DENIED; | |
62 | ||
5c6d1125 JS |
63 | /** |
64 | * smk_access_entry - look up matching access rule | |
65 | * @subject_label: a pointer to the subject's Smack label | |
66 | * @object_label: a pointer to the object's Smack label | |
7898e1f8 | 67 | * @rule_list: the list of rules to search |
5c6d1125 JS |
68 | * |
69 | * This function looks up the subject/object pair in the | |
7898e1f8 CS |
70 | * access rule list and returns the access mode. If no |
71 | * entry is found returns -ENOENT. | |
5c6d1125 JS |
72 | * |
73 | * NOTE: | |
5c6d1125 | 74 | * |
272cd7a8 CS |
75 | * Earlier versions of this function allowed for labels that |
76 | * were not on the label list. This was done to allow for | |
77 | * labels to come over the network that had never been seen | |
78 | * before on this host. Unless the receiving socket has the | |
79 | * star label this will always result in a failure check. The | |
80 | * star labeled socket case is now handled in the networking | |
81 | * hooks so there is no case where the label is not on the | |
82 | * label list. Checking to see if the address of two labels | |
83 | * is the same is now a reliable test. | |
84 | * | |
85 | * Do the object check first because that is more | |
86 | * likely to differ. | |
c0ab6e56 CS |
87 | * |
88 | * Allowing write access implies allowing locking. | |
5c6d1125 | 89 | */ |
7898e1f8 CS |
90 | int smk_access_entry(char *subject_label, char *object_label, |
91 | struct list_head *rule_list) | |
5c6d1125 | 92 | { |
7898e1f8 | 93 | int may = -ENOENT; |
5c6d1125 JS |
94 | struct smack_rule *srp; |
95 | ||
7898e1f8 | 96 | list_for_each_entry_rcu(srp, rule_list, list) { |
272cd7a8 | 97 | if (srp->smk_object == object_label && |
2f823ff8 | 98 | srp->smk_subject->smk_known == subject_label) { |
272cd7a8 CS |
99 | may = srp->smk_access; |
100 | break; | |
5c6d1125 JS |
101 | } |
102 | } | |
5c6d1125 | 103 | |
c0ab6e56 CS |
104 | /* |
105 | * MAY_WRITE implies MAY_LOCK. | |
106 | */ | |
107 | if ((may & MAY_WRITE) == MAY_WRITE) | |
108 | may |= MAY_LOCK; | |
5c6d1125 JS |
109 | return may; |
110 | } | |
111 | ||
e114e473 CS |
112 | /** |
113 | * smk_access - determine if a subject has a specific access to an object | |
2f823ff8 | 114 | * @subject_known: a pointer to the subject's Smack label entry |
e114e473 CS |
115 | * @object_label: a pointer to the object's Smack label |
116 | * @request: the access requested, in "MAY" format | |
ecfcc53f | 117 | * @a : a pointer to the audit data |
e114e473 CS |
118 | * |
119 | * This function looks up the subject/object pair in the | |
120 | * access rule list and returns 0 if the access is permitted, | |
121 | * non zero otherwise. | |
122 | * | |
272cd7a8 | 123 | * Smack labels are shared on smack_list |
e114e473 | 124 | */ |
2f823ff8 CS |
125 | int smk_access(struct smack_known *subject_known, char *object_label, |
126 | int request, struct smk_audit_info *a) | |
e114e473 | 127 | { |
7898e1f8 | 128 | int may = MAY_NOT; |
ecfcc53f | 129 | int rc = 0; |
e114e473 CS |
130 | |
131 | /* | |
132 | * Hardcoded comparisons. | |
133 | * | |
134 | * A star subject can't access any object. | |
135 | */ | |
2f823ff8 | 136 | if (subject_known == &smack_known_star) { |
ecfcc53f EB |
137 | rc = -EACCES; |
138 | goto out_audit; | |
139 | } | |
6d3dc07c CS |
140 | /* |
141 | * An internet object can be accessed by any subject. | |
142 | * Tasks cannot be assigned the internet label. | |
143 | * An internet subject can access any object. | |
144 | */ | |
145 | if (object_label == smack_known_web.smk_known || | |
2f823ff8 | 146 | subject_known == &smack_known_web) |
ecfcc53f | 147 | goto out_audit; |
e114e473 CS |
148 | /* |
149 | * A star object can be accessed by any subject. | |
150 | */ | |
272cd7a8 | 151 | if (object_label == smack_known_star.smk_known) |
ecfcc53f | 152 | goto out_audit; |
e114e473 CS |
153 | /* |
154 | * An object can be accessed in any way by a subject | |
155 | * with the same label. | |
156 | */ | |
2f823ff8 | 157 | if (subject_known->smk_known == object_label) |
ecfcc53f | 158 | goto out_audit; |
e114e473 CS |
159 | /* |
160 | * A hat subject can read any object. | |
161 | * A floor object can be read by any subject. | |
162 | */ | |
163 | if ((request & MAY_ANYREAD) == request) { | |
272cd7a8 | 164 | if (object_label == smack_known_floor.smk_known) |
ecfcc53f | 165 | goto out_audit; |
2f823ff8 | 166 | if (subject_known == &smack_known_hat) |
ecfcc53f | 167 | goto out_audit; |
e114e473 CS |
168 | } |
169 | /* | |
170 | * Beyond here an explicit relationship is required. | |
171 | * If the requested access is contained in the available | |
172 | * access (e.g. read is included in readwrite) it's | |
7898e1f8 CS |
173 | * good. A negative response from smk_access_entry() |
174 | * indicates there is no entry for this pair. | |
e114e473 | 175 | */ |
7898e1f8 | 176 | rcu_read_lock(); |
2f823ff8 CS |
177 | may = smk_access_entry(subject_known->smk_known, object_label, |
178 | &subject_known->smk_rules); | |
7898e1f8 CS |
179 | rcu_read_unlock(); |
180 | ||
d166c802 CS |
181 | if (may <= 0 || (request & may) != request) { |
182 | rc = -EACCES; | |
ecfcc53f | 183 | goto out_audit; |
d166c802 CS |
184 | } |
185 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
186 | /* | |
187 | * Return a positive value if using bringup mode. | |
188 | * This allows the hooks to identify checks that | |
189 | * succeed because of "b" rules. | |
190 | */ | |
191 | if (may & MAY_BRINGUP) | |
192 | rc = MAY_BRINGUP; | |
193 | #endif | |
e114e473 | 194 | |
ecfcc53f EB |
195 | out_audit: |
196 | #ifdef CONFIG_AUDIT | |
197 | if (a) | |
2f823ff8 CS |
198 | smack_log(subject_known->smk_known, object_label, request, |
199 | rc, a); | |
ecfcc53f | 200 | #endif |
d166c802 | 201 | |
ecfcc53f | 202 | return rc; |
e114e473 CS |
203 | } |
204 | ||
205 | /** | |
959e6c7f LP |
206 | * smk_tskacc - determine if a task has a specific access to an object |
207 | * @tsp: a pointer to the subject task | |
251a2a95 RD |
208 | * @obj_label: a pointer to the object's Smack label |
209 | * @mode: the access requested, in "MAY" format | |
ecfcc53f | 210 | * @a : common audit data |
e114e473 | 211 | * |
959e6c7f | 212 | * This function checks the subject task's label/object label pair |
e114e473 | 213 | * in the access rule list and returns 0 if the access is permitted, |
959e6c7f | 214 | * non zero otherwise. It allows that the task may have the capability |
e114e473 CS |
215 | * to override the rules. |
216 | */ | |
959e6c7f LP |
217 | int smk_tskacc(struct task_smack *subject, char *obj_label, |
218 | u32 mode, struct smk_audit_info *a) | |
e114e473 | 219 | { |
959e6c7f | 220 | struct smack_known *skp = smk_of_task(subject); |
7898e1f8 | 221 | int may; |
e114e473 CS |
222 | int rc; |
223 | ||
7898e1f8 CS |
224 | /* |
225 | * Check the global rule list | |
226 | */ | |
2f823ff8 | 227 | rc = smk_access(skp, obj_label, mode, NULL); |
d166c802 | 228 | if (rc >= 0) { |
7898e1f8 CS |
229 | /* |
230 | * If there is an entry in the task's rule list | |
231 | * it can further restrict access. | |
232 | */ | |
2f823ff8 | 233 | may = smk_access_entry(skp->smk_known, obj_label, |
959e6c7f | 234 | &subject->smk_rules); |
7898e1f8 CS |
235 | if (may < 0) |
236 | goto out_audit; | |
237 | if ((mode & may) == mode) | |
238 | goto out_audit; | |
239 | rc = -EACCES; | |
240 | } | |
e114e473 | 241 | |
15446235 | 242 | /* |
1880eff7 | 243 | * Allow for priviliged to override policy. |
15446235 | 244 | */ |
1880eff7 | 245 | if (rc != 0 && smack_privileged(CAP_MAC_OVERRIDE)) |
7898e1f8 | 246 | rc = 0; |
e114e473 | 247 | |
ecfcc53f EB |
248 | out_audit: |
249 | #ifdef CONFIG_AUDIT | |
250 | if (a) | |
2f823ff8 | 251 | smack_log(skp->smk_known, obj_label, mode, rc, a); |
ecfcc53f | 252 | #endif |
e114e473 CS |
253 | return rc; |
254 | } | |
255 | ||
959e6c7f LP |
256 | /** |
257 | * smk_curacc - determine if current has a specific access to an object | |
258 | * @obj_label: a pointer to the object's Smack label | |
259 | * @mode: the access requested, in "MAY" format | |
260 | * @a : common audit data | |
261 | * | |
262 | * This function checks the current subject label/object label pair | |
263 | * in the access rule list and returns 0 if the access is permitted, | |
264 | * non zero otherwise. It allows that current may have the capability | |
265 | * to override the rules. | |
266 | */ | |
267 | int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a) | |
268 | { | |
269 | struct task_smack *tsp = current_security(); | |
270 | ||
271 | return smk_tskacc(tsp, obj_label, mode, a); | |
272 | } | |
273 | ||
ecfcc53f EB |
274 | #ifdef CONFIG_AUDIT |
275 | /** | |
276 | * smack_str_from_perm : helper to transalate an int to a | |
277 | * readable string | |
278 | * @string : the string to fill | |
279 | * @access : the int | |
280 | * | |
281 | */ | |
282 | static inline void smack_str_from_perm(char *string, int access) | |
283 | { | |
284 | int i = 0; | |
c0ab6e56 | 285 | |
ecfcc53f EB |
286 | if (access & MAY_READ) |
287 | string[i++] = 'r'; | |
288 | if (access & MAY_WRITE) | |
289 | string[i++] = 'w'; | |
290 | if (access & MAY_EXEC) | |
291 | string[i++] = 'x'; | |
292 | if (access & MAY_APPEND) | |
293 | string[i++] = 'a'; | |
a87d79ad RK |
294 | if (access & MAY_TRANSMUTE) |
295 | string[i++] = 't'; | |
c0ab6e56 CS |
296 | if (access & MAY_LOCK) |
297 | string[i++] = 'l'; | |
ecfcc53f EB |
298 | string[i] = '\0'; |
299 | } | |
300 | /** | |
301 | * smack_log_callback - SMACK specific information | |
302 | * will be called by generic audit code | |
303 | * @ab : the audit_buffer | |
304 | * @a : audit_data | |
305 | * | |
306 | */ | |
307 | static void smack_log_callback(struct audit_buffer *ab, void *a) | |
308 | { | |
309 | struct common_audit_data *ad = a; | |
3b3b0e4f | 310 | struct smack_audit_data *sad = ad->smack_audit_data; |
ed5215a2 | 311 | audit_log_format(ab, "lsm=SMACK fn=%s action=%s", |
3b3b0e4f | 312 | ad->smack_audit_data->function, |
ecfcc53f EB |
313 | sad->result ? "denied" : "granted"); |
314 | audit_log_format(ab, " subject="); | |
315 | audit_log_untrustedstring(ab, sad->subject); | |
316 | audit_log_format(ab, " object="); | |
317 | audit_log_untrustedstring(ab, sad->object); | |
66867818 LP |
318 | if (sad->request[0] == '\0') |
319 | audit_log_format(ab, " labels_differ"); | |
320 | else | |
321 | audit_log_format(ab, " requested=%s", sad->request); | |
ecfcc53f EB |
322 | } |
323 | ||
324 | /** | |
325 | * smack_log - Audit the granting or denial of permissions. | |
326 | * @subject_label : smack label of the requester | |
327 | * @object_label : smack label of the object being accessed | |
328 | * @request: requested permissions | |
329 | * @result: result from smk_access | |
330 | * @a: auxiliary audit data | |
331 | * | |
332 | * Audit the granting or denial of permissions in accordance | |
333 | * with the policy. | |
334 | */ | |
335 | void smack_log(char *subject_label, char *object_label, int request, | |
336 | int result, struct smk_audit_info *ad) | |
337 | { | |
338 | char request_buffer[SMK_NUM_ACCESS_TYPE + 1]; | |
339 | struct smack_audit_data *sad; | |
340 | struct common_audit_data *a = &ad->a; | |
341 | ||
d166c802 CS |
342 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
343 | /* | |
344 | * The result may be positive in bringup mode. | |
345 | */ | |
346 | if (result > 0) | |
347 | result = 0; | |
348 | #endif | |
ecfcc53f EB |
349 | /* check if we have to log the current event */ |
350 | if (result != 0 && (log_policy & SMACK_AUDIT_DENIED) == 0) | |
351 | return; | |
352 | if (result == 0 && (log_policy & SMACK_AUDIT_ACCEPT) == 0) | |
353 | return; | |
354 | ||
3b3b0e4f EP |
355 | sad = a->smack_audit_data; |
356 | ||
357 | if (sad->function == NULL) | |
358 | sad->function = "unknown"; | |
ecfcc53f EB |
359 | |
360 | /* end preparing the audit data */ | |
ecfcc53f EB |
361 | smack_str_from_perm(request_buffer, request); |
362 | sad->subject = subject_label; | |
363 | sad->object = object_label; | |
364 | sad->request = request_buffer; | |
365 | sad->result = result; | |
ecfcc53f | 366 | |
b61c37f5 | 367 | common_lsm_audit(a, smack_log_callback, NULL); |
ecfcc53f EB |
368 | } |
369 | #else /* #ifdef CONFIG_AUDIT */ | |
370 | void smack_log(char *subject_label, char *object_label, int request, | |
371 | int result, struct smk_audit_info *ad) | |
372 | { | |
373 | } | |
374 | #endif | |
375 | ||
f7112e6c | 376 | DEFINE_MUTEX(smack_known_lock); |
e114e473 | 377 | |
4d7cf4a1 TS |
378 | struct hlist_head smack_known_hash[SMACK_HASH_SLOTS]; |
379 | ||
380 | /** | |
381 | * smk_insert_entry - insert a smack label into a hash map, | |
382 | * | |
383 | * this function must be called under smack_known_lock | |
384 | */ | |
385 | void smk_insert_entry(struct smack_known *skp) | |
386 | { | |
387 | unsigned int hash; | |
388 | struct hlist_head *head; | |
389 | ||
390 | hash = full_name_hash(skp->smk_known, strlen(skp->smk_known)); | |
391 | head = &smack_known_hash[hash & (SMACK_HASH_SLOTS - 1)]; | |
392 | ||
393 | hlist_add_head_rcu(&skp->smk_hashed, head); | |
394 | list_add_rcu(&skp->list, &smack_known_list); | |
395 | } | |
396 | ||
272cd7a8 CS |
397 | /** |
398 | * smk_find_entry - find a label on the list, return the list entry | |
399 | * @string: a text string that might be a Smack label | |
400 | * | |
401 | * Returns a pointer to the entry in the label list that | |
402 | * matches the passed string. | |
403 | */ | |
404 | struct smack_known *smk_find_entry(const char *string) | |
405 | { | |
4d7cf4a1 TS |
406 | unsigned int hash; |
407 | struct hlist_head *head; | |
272cd7a8 CS |
408 | struct smack_known *skp; |
409 | ||
4d7cf4a1 TS |
410 | hash = full_name_hash(string, strlen(string)); |
411 | head = &smack_known_hash[hash & (SMACK_HASH_SLOTS - 1)]; | |
412 | ||
413 | hlist_for_each_entry_rcu(skp, head, smk_hashed) | |
f7112e6c | 414 | if (strcmp(skp->smk_known, string) == 0) |
272cd7a8 | 415 | return skp; |
272cd7a8 CS |
416 | |
417 | return NULL; | |
418 | } | |
419 | ||
e114e473 | 420 | /** |
0e94ae17 JS |
421 | * smk_parse_smack - parse smack label from a text string |
422 | * @string: a text string that might contain a Smack label | |
e114e473 | 423 | * @len: the maximum size, or zero if it is NULL terminated. |
f7112e6c CS |
424 | * |
425 | * Returns a pointer to the clean label, or NULL | |
e114e473 | 426 | */ |
f7112e6c | 427 | char *smk_parse_smack(const char *string, int len) |
e114e473 | 428 | { |
f7112e6c | 429 | char *smack; |
e114e473 CS |
430 | int i; |
431 | ||
f7112e6c CS |
432 | if (len <= 0) |
433 | len = strlen(string) + 1; | |
434 | ||
435 | /* | |
436 | * Reserve a leading '-' as an indicator that | |
437 | * this isn't a label, but an option to interfaces | |
438 | * including /smack/cipso and /smack/cipso2 | |
439 | */ | |
440 | if (string[0] == '-') | |
441 | return NULL; | |
442 | ||
443 | for (i = 0; i < len; i++) | |
444 | if (string[i] > '~' || string[i] <= ' ' || string[i] == '/' || | |
445 | string[i] == '"' || string[i] == '\\' || string[i] == '\'') | |
446 | break; | |
447 | ||
448 | if (i == 0 || i >= SMK_LONGLABEL) | |
449 | return NULL; | |
450 | ||
451 | smack = kzalloc(i + 1, GFP_KERNEL); | |
452 | if (smack != NULL) { | |
453 | strncpy(smack, string, i + 1); | |
454 | smack[i] = '\0'; | |
e114e473 | 455 | } |
f7112e6c CS |
456 | return smack; |
457 | } | |
458 | ||
459 | /** | |
460 | * smk_netlbl_mls - convert a catset to netlabel mls categories | |
461 | * @catset: the Smack categories | |
462 | * @sap: where to put the netlabel categories | |
463 | * | |
464 | * Allocates and fills attr.mls | |
465 | * Returns 0 on success, error code on failure. | |
466 | */ | |
467 | int smk_netlbl_mls(int level, char *catset, struct netlbl_lsm_secattr *sap, | |
468 | int len) | |
469 | { | |
470 | unsigned char *cp; | |
471 | unsigned char m; | |
472 | int cat; | |
473 | int rc; | |
474 | int byte; | |
475 | ||
476 | sap->flags |= NETLBL_SECATTR_MLS_CAT; | |
477 | sap->attr.mls.lvl = level; | |
4b8feff2 | 478 | sap->attr.mls.cat = NULL; |
f7112e6c CS |
479 | |
480 | for (cat = 1, cp = catset, byte = 0; byte < len; cp++, byte++) | |
481 | for (m = 0x80; m != 0; m >>= 1, cat++) { | |
482 | if ((m & *cp) == 0) | |
483 | continue; | |
4fbe63d1 PM |
484 | rc = netlbl_catmap_setbit(&sap->attr.mls.cat, |
485 | cat, GFP_ATOMIC); | |
f7112e6c | 486 | if (rc < 0) { |
4fbe63d1 | 487 | netlbl_catmap_free(sap->attr.mls.cat); |
f7112e6c CS |
488 | return rc; |
489 | } | |
490 | } | |
491 | ||
492 | return 0; | |
0e94ae17 JS |
493 | } |
494 | ||
495 | /** | |
496 | * smk_import_entry - import a label, return the list entry | |
497 | * @string: a text string that might be a Smack label | |
498 | * @len: the maximum size, or zero if it is NULL terminated. | |
499 | * | |
500 | * Returns a pointer to the entry in the label list that | |
501 | * matches the passed string, adding it if necessary. | |
502 | */ | |
503 | struct smack_known *smk_import_entry(const char *string, int len) | |
504 | { | |
505 | struct smack_known *skp; | |
f7112e6c CS |
506 | char *smack; |
507 | int slen; | |
508 | int rc; | |
e114e473 | 509 | |
f7112e6c CS |
510 | smack = smk_parse_smack(string, len); |
511 | if (smack == NULL) | |
e114e473 CS |
512 | return NULL; |
513 | ||
514 | mutex_lock(&smack_known_lock); | |
515 | ||
272cd7a8 | 516 | skp = smk_find_entry(smack); |
f7112e6c CS |
517 | if (skp != NULL) |
518 | goto freeout; | |
e114e473 | 519 | |
f7112e6c CS |
520 | skp = kzalloc(sizeof(*skp), GFP_KERNEL); |
521 | if (skp == NULL) | |
522 | goto freeout; | |
e114e473 | 523 | |
f7112e6c CS |
524 | skp->smk_known = smack; |
525 | skp->smk_secid = smack_next_secid++; | |
526 | skp->smk_netlabel.domain = skp->smk_known; | |
527 | skp->smk_netlabel.flags = | |
528 | NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
529 | /* | |
530 | * If direct labeling works use it. | |
531 | * Otherwise use mapped labeling. | |
532 | */ | |
533 | slen = strlen(smack); | |
534 | if (slen < SMK_CIPSOLEN) | |
535 | rc = smk_netlbl_mls(smack_cipso_direct, skp->smk_known, | |
536 | &skp->smk_netlabel, slen); | |
537 | else | |
538 | rc = smk_netlbl_mls(smack_cipso_mapped, (char *)&skp->smk_secid, | |
539 | &skp->smk_netlabel, sizeof(skp->smk_secid)); | |
540 | ||
541 | if (rc >= 0) { | |
542 | INIT_LIST_HEAD(&skp->smk_rules); | |
543 | mutex_init(&skp->smk_rules_lock); | |
544 | /* | |
545 | * Make sure that the entry is actually | |
546 | * filled before putting it on the list. | |
547 | */ | |
4d7cf4a1 | 548 | smk_insert_entry(skp); |
f7112e6c CS |
549 | goto unlockout; |
550 | } | |
551 | /* | |
552 | * smk_netlbl_mls failed. | |
553 | */ | |
554 | kfree(skp); | |
555 | skp = NULL; | |
556 | freeout: | |
557 | kfree(smack); | |
558 | unlockout: | |
e114e473 CS |
559 | mutex_unlock(&smack_known_lock); |
560 | ||
561 | return skp; | |
562 | } | |
563 | ||
564 | /** | |
565 | * smk_import - import a smack label | |
566 | * @string: a text string that might be a Smack label | |
567 | * @len: the maximum size, or zero if it is NULL terminated. | |
568 | * | |
569 | * Returns a pointer to the label in the label list that | |
570 | * matches the passed string, adding it if necessary. | |
571 | */ | |
572 | char *smk_import(const char *string, int len) | |
573 | { | |
574 | struct smack_known *skp; | |
575 | ||
4303154e EB |
576 | /* labels cannot begin with a '-' */ |
577 | if (string[0] == '-') | |
578 | return NULL; | |
e114e473 CS |
579 | skp = smk_import_entry(string, len); |
580 | if (skp == NULL) | |
581 | return NULL; | |
582 | return skp->smk_known; | |
583 | } | |
584 | ||
585 | /** | |
586 | * smack_from_secid - find the Smack label associated with a secid | |
587 | * @secid: an integer that might be associated with a Smack label | |
588 | * | |
2f823ff8 | 589 | * Returns a pointer to the appropriate Smack label entry if there is one, |
e114e473 CS |
590 | * otherwise a pointer to the invalid Smack label. |
591 | */ | |
2f823ff8 | 592 | struct smack_known *smack_from_secid(const u32 secid) |
e114e473 CS |
593 | { |
594 | struct smack_known *skp; | |
595 | ||
7198e2ee EB |
596 | rcu_read_lock(); |
597 | list_for_each_entry_rcu(skp, &smack_known_list, list) { | |
598 | if (skp->smk_secid == secid) { | |
599 | rcu_read_unlock(); | |
2f823ff8 | 600 | return skp; |
7198e2ee EB |
601 | } |
602 | } | |
e114e473 CS |
603 | |
604 | /* | |
605 | * If we got this far someone asked for the translation | |
606 | * of a secid that is not on the list. | |
607 | */ | |
7198e2ee | 608 | rcu_read_unlock(); |
2f823ff8 | 609 | return &smack_known_invalid; |
e114e473 CS |
610 | } |
611 | ||
612 | /** | |
613 | * smack_to_secid - find the secid associated with a Smack label | |
614 | * @smack: the Smack label | |
615 | * | |
616 | * Returns the appropriate secid if there is one, | |
617 | * otherwise 0 | |
618 | */ | |
619 | u32 smack_to_secid(const char *smack) | |
620 | { | |
f7112e6c | 621 | struct smack_known *skp = smk_find_entry(smack); |
e114e473 | 622 | |
f7112e6c CS |
623 | if (skp == NULL) |
624 | return 0; | |
625 | return skp->smk_secid; | |
e114e473 | 626 | } |