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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Implementation of the multi-level security (MLS) policy. | |
3 | * | |
4 | * Author : Stephen Smalley, <sds@epoch.ncsc.mil> | |
5 | */ | |
6 | /* | |
7 | * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> | |
8 | * | |
9 | * Support for enhanced MLS infrastructure. | |
10 | * | |
376bd9cb | 11 | * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. |
1da177e4 | 12 | */ |
7420ed23 VY |
13 | /* |
14 | * Updated: Hewlett-Packard <paul.moore@hp.com> | |
15 | * | |
02752760 | 16 | * Added support to import/export the MLS label from NetLabel |
7420ed23 VY |
17 | * |
18 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 | |
19 | */ | |
1da177e4 LT |
20 | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/errno.h> | |
02752760 | 25 | #include <net/netlabel.h> |
f5c1d5b2 | 26 | #include "sidtab.h" |
1da177e4 LT |
27 | #include "mls.h" |
28 | #include "policydb.h" | |
29 | #include "services.h" | |
30 | ||
31 | /* | |
32 | * Return the length in bytes for the MLS fields of the | |
33 | * security context string representation of `context'. | |
34 | */ | |
35 | int mls_compute_context_len(struct context * context) | |
36 | { | |
9fe79ad1 KK |
37 | int i, l, len, head, prev; |
38 | char *nm; | |
39 | struct ebitmap *e; | |
782ebb99 | 40 | struct ebitmap_node *node; |
1da177e4 LT |
41 | |
42 | if (!selinux_mls_enabled) | |
43 | return 0; | |
44 | ||
45 | len = 1; /* for the beginning ":" */ | |
46 | for (l = 0; l < 2; l++) { | |
9fe79ad1 KK |
47 | int index_sens = context->range.level[l].sens; |
48 | len += strlen(policydb.p_sens_val_to_name[index_sens - 1]); | |
1da177e4 | 49 | |
9fe79ad1 KK |
50 | /* categories */ |
51 | head = -2; | |
52 | prev = -2; | |
53 | e = &context->range.level[l].cat; | |
54 | ebitmap_for_each_positive_bit(e, node, i) { | |
55 | if (i - prev > 1) { | |
56 | /* one or more negative bits are skipped */ | |
57 | if (head != prev) { | |
58 | nm = policydb.p_cat_val_to_name[prev]; | |
59 | len += strlen(nm) + 1; | |
60 | } | |
61 | nm = policydb.p_cat_val_to_name[i]; | |
62 | len += strlen(nm) + 1; | |
63 | head = i; | |
1da177e4 | 64 | } |
9fe79ad1 KK |
65 | prev = i; |
66 | } | |
67 | if (prev != head) { | |
68 | nm = policydb.p_cat_val_to_name[prev]; | |
69 | len += strlen(nm) + 1; | |
1da177e4 | 70 | } |
1da177e4 LT |
71 | if (l == 0) { |
72 | if (mls_level_eq(&context->range.level[0], | |
9fe79ad1 | 73 | &context->range.level[1])) |
1da177e4 LT |
74 | break; |
75 | else | |
76 | len++; | |
77 | } | |
78 | } | |
79 | ||
80 | return len; | |
81 | } | |
82 | ||
83 | /* | |
84 | * Write the security context string representation of | |
85 | * the MLS fields of `context' into the string `*scontext'. | |
86 | * Update `*scontext' to point to the end of the MLS fields. | |
87 | */ | |
88 | void mls_sid_to_context(struct context *context, | |
89 | char **scontext) | |
90 | { | |
9fe79ad1 KK |
91 | char *scontextp, *nm; |
92 | int i, l, head, prev; | |
93 | struct ebitmap *e; | |
782ebb99 | 94 | struct ebitmap_node *node; |
1da177e4 LT |
95 | |
96 | if (!selinux_mls_enabled) | |
97 | return; | |
98 | ||
99 | scontextp = *scontext; | |
100 | ||
101 | *scontextp = ':'; | |
102 | scontextp++; | |
103 | ||
104 | for (l = 0; l < 2; l++) { | |
1da177e4 LT |
105 | strcpy(scontextp, |
106 | policydb.p_sens_val_to_name[context->range.level[l].sens - 1]); | |
9fe79ad1 | 107 | scontextp += strlen(scontextp); |
1da177e4 LT |
108 | |
109 | /* categories */ | |
9fe79ad1 KK |
110 | head = -2; |
111 | prev = -2; | |
112 | e = &context->range.level[l].cat; | |
113 | ebitmap_for_each_positive_bit(e, node, i) { | |
114 | if (i - prev > 1) { | |
115 | /* one or more negative bits are skipped */ | |
116 | if (prev != head) { | |
117 | if (prev - head > 1) | |
1da177e4 LT |
118 | *scontextp++ = '.'; |
119 | else | |
120 | *scontextp++ = ','; | |
9fe79ad1 KK |
121 | nm = policydb.p_cat_val_to_name[prev]; |
122 | strcpy(scontextp, nm); | |
123 | scontextp += strlen(nm); | |
1da177e4 | 124 | } |
9fe79ad1 KK |
125 | if (prev < 0) |
126 | *scontextp++ = ':'; | |
127 | else | |
128 | *scontextp++ = ','; | |
129 | nm = policydb.p_cat_val_to_name[i]; | |
130 | strcpy(scontextp, nm); | |
131 | scontextp += strlen(nm); | |
132 | head = i; | |
1da177e4 | 133 | } |
9fe79ad1 | 134 | prev = i; |
1da177e4 LT |
135 | } |
136 | ||
9fe79ad1 KK |
137 | if (prev != head) { |
138 | if (prev - head > 1) | |
1da177e4 LT |
139 | *scontextp++ = '.'; |
140 | else | |
141 | *scontextp++ = ','; | |
9fe79ad1 KK |
142 | nm = policydb.p_cat_val_to_name[prev]; |
143 | strcpy(scontextp, nm); | |
144 | scontextp += strlen(nm); | |
1da177e4 LT |
145 | } |
146 | ||
147 | if (l == 0) { | |
148 | if (mls_level_eq(&context->range.level[0], | |
149 | &context->range.level[1])) | |
150 | break; | |
9fe79ad1 KK |
151 | else |
152 | *scontextp++ = '-'; | |
1da177e4 LT |
153 | } |
154 | } | |
155 | ||
156 | *scontext = scontextp; | |
157 | return; | |
158 | } | |
159 | ||
45e5421e SS |
160 | int mls_level_isvalid(struct policydb *p, struct mls_level *l) |
161 | { | |
162 | struct level_datum *levdatum; | |
163 | struct ebitmap_node *node; | |
164 | int i; | |
165 | ||
166 | if (!l->sens || l->sens > p->p_levels.nprim) | |
167 | return 0; | |
168 | levdatum = hashtab_search(p->p_levels.table, | |
169 | p->p_sens_val_to_name[l->sens - 1]); | |
170 | if (!levdatum) | |
171 | return 0; | |
172 | ||
173 | ebitmap_for_each_positive_bit(&l->cat, node, i) { | |
174 | if (i > p->p_cats.nprim) | |
175 | return 0; | |
176 | if (!ebitmap_get_bit(&levdatum->level->cat, i)) { | |
177 | /* | |
178 | * Category may not be associated with | |
179 | * sensitivity. | |
180 | */ | |
181 | return 0; | |
182 | } | |
183 | } | |
184 | ||
185 | return 1; | |
186 | } | |
187 | ||
188 | int mls_range_isvalid(struct policydb *p, struct mls_range *r) | |
189 | { | |
190 | return (mls_level_isvalid(p, &r->level[0]) && | |
191 | mls_level_isvalid(p, &r->level[1]) && | |
192 | mls_level_dom(&r->level[1], &r->level[0])); | |
193 | } | |
194 | ||
1da177e4 LT |
195 | /* |
196 | * Return 1 if the MLS fields in the security context | |
197 | * structure `c' are valid. Return 0 otherwise. | |
198 | */ | |
199 | int mls_context_isvalid(struct policydb *p, struct context *c) | |
200 | { | |
1da177e4 | 201 | struct user_datum *usrdatum; |
1da177e4 LT |
202 | |
203 | if (!selinux_mls_enabled) | |
204 | return 1; | |
205 | ||
45e5421e | 206 | if (!mls_range_isvalid(p, &c->range)) |
1da177e4 LT |
207 | return 0; |
208 | ||
1da177e4 LT |
209 | if (c->role == OBJECT_R_VAL) |
210 | return 1; | |
211 | ||
212 | /* | |
213 | * User must be authorized for the MLS range. | |
214 | */ | |
215 | if (!c->user || c->user > p->p_users.nprim) | |
216 | return 0; | |
217 | usrdatum = p->user_val_to_struct[c->user - 1]; | |
218 | if (!mls_range_contains(usrdatum->range, c->range)) | |
219 | return 0; /* user may not be associated with range */ | |
220 | ||
221 | return 1; | |
222 | } | |
223 | ||
224 | /* | |
225 | * Set the MLS fields in the security context structure | |
226 | * `context' based on the string representation in | |
227 | * the string `*scontext'. Update `*scontext' to | |
228 | * point to the end of the string representation of | |
229 | * the MLS fields. | |
230 | * | |
231 | * This function modifies the string in place, inserting | |
232 | * NULL characters to terminate the MLS fields. | |
f5c1d5b2 JM |
233 | * |
234 | * If a def_sid is provided and no MLS field is present, | |
235 | * copy the MLS field of the associated default context. | |
236 | * Used for upgraded to MLS systems where objects may lack | |
237 | * MLS fields. | |
238 | * | |
239 | * Policy read-lock must be held for sidtab lookup. | |
240 | * | |
1da177e4 LT |
241 | */ |
242 | int mls_context_to_sid(char oldc, | |
243 | char **scontext, | |
f5c1d5b2 JM |
244 | struct context *context, |
245 | struct sidtab *s, | |
246 | u32 def_sid) | |
1da177e4 LT |
247 | { |
248 | ||
249 | char delim; | |
250 | char *scontextp, *p, *rngptr; | |
251 | struct level_datum *levdatum; | |
252 | struct cat_datum *catdatum, *rngdatum; | |
253 | int l, rc = -EINVAL; | |
254 | ||
e517a0cd SS |
255 | if (!selinux_mls_enabled) { |
256 | if (def_sid != SECSID_NULL && oldc) | |
ab5703b3 | 257 | *scontext += strlen(*scontext)+1; |
1da177e4 | 258 | return 0; |
e517a0cd | 259 | } |
1da177e4 | 260 | |
f5c1d5b2 JM |
261 | /* |
262 | * No MLS component to the security context, try and map to | |
263 | * default if provided. | |
264 | */ | |
265 | if (!oldc) { | |
266 | struct context *defcon; | |
267 | ||
268 | if (def_sid == SECSID_NULL) | |
269 | goto out; | |
270 | ||
271 | defcon = sidtab_search(s, def_sid); | |
272 | if (!defcon) | |
273 | goto out; | |
274 | ||
0efc61ea | 275 | rc = mls_context_cpy(context, defcon); |
1da177e4 | 276 | goto out; |
f5c1d5b2 | 277 | } |
1da177e4 LT |
278 | |
279 | /* Extract low sensitivity. */ | |
280 | scontextp = p = *scontext; | |
281 | while (*p && *p != ':' && *p != '-') | |
282 | p++; | |
283 | ||
284 | delim = *p; | |
285 | if (delim != 0) | |
286 | *p++ = 0; | |
287 | ||
288 | for (l = 0; l < 2; l++) { | |
289 | levdatum = hashtab_search(policydb.p_levels.table, scontextp); | |
290 | if (!levdatum) { | |
291 | rc = -EINVAL; | |
292 | goto out; | |
293 | } | |
294 | ||
295 | context->range.level[l].sens = levdatum->level->sens; | |
296 | ||
297 | if (delim == ':') { | |
298 | /* Extract category set. */ | |
299 | while (1) { | |
300 | scontextp = p; | |
301 | while (*p && *p != ',' && *p != '-') | |
302 | p++; | |
303 | delim = *p; | |
304 | if (delim != 0) | |
305 | *p++ = 0; | |
306 | ||
307 | /* Separate into range if exists */ | |
308 | if ((rngptr = strchr(scontextp, '.')) != NULL) { | |
309 | /* Remove '.' */ | |
310 | *rngptr++ = 0; | |
311 | } | |
312 | ||
313 | catdatum = hashtab_search(policydb.p_cats.table, | |
314 | scontextp); | |
315 | if (!catdatum) { | |
316 | rc = -EINVAL; | |
317 | goto out; | |
318 | } | |
319 | ||
320 | rc = ebitmap_set_bit(&context->range.level[l].cat, | |
321 | catdatum->value - 1, 1); | |
322 | if (rc) | |
323 | goto out; | |
324 | ||
325 | /* If range, set all categories in range */ | |
326 | if (rngptr) { | |
327 | int i; | |
328 | ||
329 | rngdatum = hashtab_search(policydb.p_cats.table, rngptr); | |
330 | if (!rngdatum) { | |
331 | rc = -EINVAL; | |
332 | goto out; | |
333 | } | |
334 | ||
335 | if (catdatum->value >= rngdatum->value) { | |
336 | rc = -EINVAL; | |
337 | goto out; | |
338 | } | |
339 | ||
340 | for (i = catdatum->value; i < rngdatum->value; i++) { | |
341 | rc = ebitmap_set_bit(&context->range.level[l].cat, i, 1); | |
342 | if (rc) | |
343 | goto out; | |
344 | } | |
345 | } | |
346 | ||
347 | if (delim != ',') | |
348 | break; | |
349 | } | |
350 | } | |
351 | if (delim == '-') { | |
352 | /* Extract high sensitivity. */ | |
353 | scontextp = p; | |
354 | while (*p && *p != ':') | |
355 | p++; | |
356 | ||
357 | delim = *p; | |
358 | if (delim != 0) | |
359 | *p++ = 0; | |
360 | } else | |
361 | break; | |
362 | } | |
363 | ||
364 | if (l == 0) { | |
365 | context->range.level[1].sens = context->range.level[0].sens; | |
366 | rc = ebitmap_cpy(&context->range.level[1].cat, | |
367 | &context->range.level[0].cat); | |
368 | if (rc) | |
369 | goto out; | |
370 | } | |
371 | *scontext = ++p; | |
372 | rc = 0; | |
373 | out: | |
374 | return rc; | |
375 | } | |
376 | ||
376bd9cb DG |
377 | /* |
378 | * Set the MLS fields in the security context structure | |
379 | * `context' based on the string representation in | |
380 | * the string `str'. This function will allocate temporary memory with the | |
381 | * given constraints of gfp_mask. | |
382 | */ | |
383 | int mls_from_string(char *str, struct context *context, gfp_t gfp_mask) | |
384 | { | |
385 | char *tmpstr, *freestr; | |
386 | int rc; | |
387 | ||
388 | if (!selinux_mls_enabled) | |
389 | return -EINVAL; | |
390 | ||
391 | /* we need freestr because mls_context_to_sid will change | |
392 | the value of tmpstr */ | |
393 | tmpstr = freestr = kstrdup(str, gfp_mask); | |
394 | if (!tmpstr) { | |
395 | rc = -ENOMEM; | |
396 | } else { | |
397 | rc = mls_context_to_sid(':', &tmpstr, context, | |
398 | NULL, SECSID_NULL); | |
399 | kfree(freestr); | |
400 | } | |
401 | ||
402 | return rc; | |
403 | } | |
404 | ||
1da177e4 LT |
405 | /* |
406 | * Copies the MLS range `range' into `context'. | |
407 | */ | |
408 | static inline int mls_range_set(struct context *context, | |
409 | struct mls_range *range) | |
410 | { | |
411 | int l, rc = 0; | |
412 | ||
413 | /* Copy the MLS range into the context */ | |
414 | for (l = 0; l < 2; l++) { | |
415 | context->range.level[l].sens = range->level[l].sens; | |
416 | rc = ebitmap_cpy(&context->range.level[l].cat, | |
417 | &range->level[l].cat); | |
418 | if (rc) | |
419 | break; | |
420 | } | |
421 | ||
422 | return rc; | |
423 | } | |
424 | ||
425 | int mls_setup_user_range(struct context *fromcon, struct user_datum *user, | |
426 | struct context *usercon) | |
427 | { | |
428 | if (selinux_mls_enabled) { | |
429 | struct mls_level *fromcon_sen = &(fromcon->range.level[0]); | |
430 | struct mls_level *fromcon_clr = &(fromcon->range.level[1]); | |
431 | struct mls_level *user_low = &(user->range.level[0]); | |
432 | struct mls_level *user_clr = &(user->range.level[1]); | |
433 | struct mls_level *user_def = &(user->dfltlevel); | |
434 | struct mls_level *usercon_sen = &(usercon->range.level[0]); | |
435 | struct mls_level *usercon_clr = &(usercon->range.level[1]); | |
436 | ||
437 | /* Honor the user's default level if we can */ | |
438 | if (mls_level_between(user_def, fromcon_sen, fromcon_clr)) { | |
439 | *usercon_sen = *user_def; | |
440 | } else if (mls_level_between(fromcon_sen, user_def, user_clr)) { | |
441 | *usercon_sen = *fromcon_sen; | |
442 | } else if (mls_level_between(fromcon_clr, user_low, user_def)) { | |
443 | *usercon_sen = *user_low; | |
444 | } else | |
445 | return -EINVAL; | |
446 | ||
447 | /* Lower the clearance of available contexts | |
448 | if the clearance of "fromcon" is lower than | |
449 | that of the user's default clearance (but | |
450 | only if the "fromcon" clearance dominates | |
451 | the user's computed sensitivity level) */ | |
452 | if (mls_level_dom(user_clr, fromcon_clr)) { | |
453 | *usercon_clr = *fromcon_clr; | |
454 | } else if (mls_level_dom(fromcon_clr, user_clr)) { | |
455 | *usercon_clr = *user_clr; | |
456 | } else | |
457 | return -EINVAL; | |
458 | } | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
463 | /* | |
464 | * Convert the MLS fields in the security context | |
465 | * structure `c' from the values specified in the | |
466 | * policy `oldp' to the values specified in the policy `newp'. | |
467 | */ | |
468 | int mls_convert_context(struct policydb *oldp, | |
469 | struct policydb *newp, | |
470 | struct context *c) | |
471 | { | |
472 | struct level_datum *levdatum; | |
473 | struct cat_datum *catdatum; | |
474 | struct ebitmap bitmap; | |
782ebb99 | 475 | struct ebitmap_node *node; |
1da177e4 LT |
476 | int l, i; |
477 | ||
478 | if (!selinux_mls_enabled) | |
479 | return 0; | |
480 | ||
481 | for (l = 0; l < 2; l++) { | |
482 | levdatum = hashtab_search(newp->p_levels.table, | |
483 | oldp->p_sens_val_to_name[c->range.level[l].sens - 1]); | |
484 | ||
485 | if (!levdatum) | |
486 | return -EINVAL; | |
487 | c->range.level[l].sens = levdatum->level->sens; | |
488 | ||
489 | ebitmap_init(&bitmap); | |
9fe79ad1 KK |
490 | ebitmap_for_each_positive_bit(&c->range.level[l].cat, node, i) { |
491 | int rc; | |
492 | ||
493 | catdatum = hashtab_search(newp->p_cats.table, | |
494 | oldp->p_cat_val_to_name[i]); | |
495 | if (!catdatum) | |
496 | return -EINVAL; | |
497 | rc = ebitmap_set_bit(&bitmap, catdatum->value - 1, 1); | |
498 | if (rc) | |
499 | return rc; | |
1da177e4 LT |
500 | } |
501 | ebitmap_destroy(&c->range.level[l].cat); | |
502 | c->range.level[l].cat = bitmap; | |
503 | } | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
508 | int mls_compute_sid(struct context *scontext, | |
509 | struct context *tcontext, | |
510 | u16 tclass, | |
511 | u32 specified, | |
512 | struct context *newcontext) | |
513 | { | |
f3f87714 DG |
514 | struct range_trans *rtr; |
515 | ||
1da177e4 LT |
516 | if (!selinux_mls_enabled) |
517 | return 0; | |
518 | ||
519 | switch (specified) { | |
520 | case AVTAB_TRANSITION: | |
f3f87714 DG |
521 | /* Look for a range transition rule. */ |
522 | for (rtr = policydb.range_tr; rtr; rtr = rtr->next) { | |
523 | if (rtr->source_type == scontext->type && | |
524 | rtr->target_type == tcontext->type && | |
525 | rtr->target_class == tclass) { | |
526 | /* Set the range from the rule */ | |
527 | return mls_range_set(newcontext, | |
528 | &rtr->target_range); | |
1da177e4 LT |
529 | } |
530 | } | |
531 | /* Fallthrough */ | |
532 | case AVTAB_CHANGE: | |
533 | if (tclass == SECCLASS_PROCESS) | |
534 | /* Use the process MLS attributes. */ | |
0efc61ea | 535 | return mls_context_cpy(newcontext, scontext); |
1da177e4 LT |
536 | else |
537 | /* Use the process effective MLS attributes. */ | |
0efc61ea | 538 | return mls_context_cpy_low(newcontext, scontext); |
1da177e4 | 539 | case AVTAB_MEMBER: |
2e08c0c1 EW |
540 | /* Use the process effective MLS attributes. */ |
541 | return mls_context_cpy_low(newcontext, scontext); | |
1da177e4 LT |
542 | default: |
543 | return -EINVAL; | |
544 | } | |
545 | return -EINVAL; | |
546 | } | |
547 | ||
02752760 | 548 | #ifdef CONFIG_NETLABEL |
7420ed23 | 549 | /** |
02752760 | 550 | * mls_export_netlbl_lvl - Export the MLS sensitivity levels to NetLabel |
7420ed23 | 551 | * @context: the security context |
02752760 | 552 | * @secattr: the NetLabel security attributes |
7420ed23 VY |
553 | * |
554 | * Description: | |
02752760 PM |
555 | * Given the security context copy the low MLS sensitivity level into the |
556 | * NetLabel MLS sensitivity level field. | |
7420ed23 VY |
557 | * |
558 | */ | |
02752760 PM |
559 | void mls_export_netlbl_lvl(struct context *context, |
560 | struct netlbl_lsm_secattr *secattr) | |
7420ed23 VY |
561 | { |
562 | if (!selinux_mls_enabled) | |
563 | return; | |
564 | ||
02752760 PM |
565 | secattr->mls_lvl = context->range.level[0].sens - 1; |
566 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; | |
7420ed23 VY |
567 | } |
568 | ||
569 | /** | |
02752760 | 570 | * mls_import_netlbl_lvl - Import the NetLabel MLS sensitivity levels |
7420ed23 | 571 | * @context: the security context |
02752760 | 572 | * @secattr: the NetLabel security attributes |
7420ed23 VY |
573 | * |
574 | * Description: | |
02752760 PM |
575 | * Given the security context and the NetLabel security attributes, copy the |
576 | * NetLabel MLS sensitivity level into the context. | |
7420ed23 VY |
577 | * |
578 | */ | |
02752760 PM |
579 | void mls_import_netlbl_lvl(struct context *context, |
580 | struct netlbl_lsm_secattr *secattr) | |
7420ed23 VY |
581 | { |
582 | if (!selinux_mls_enabled) | |
583 | return; | |
584 | ||
02752760 PM |
585 | context->range.level[0].sens = secattr->mls_lvl + 1; |
586 | context->range.level[1].sens = context->range.level[0].sens; | |
7420ed23 VY |
587 | } |
588 | ||
589 | /** | |
02752760 | 590 | * mls_export_netlbl_cat - Export the MLS categories to NetLabel |
7420ed23 | 591 | * @context: the security context |
02752760 | 592 | * @secattr: the NetLabel security attributes |
7420ed23 VY |
593 | * |
594 | * Description: | |
02752760 PM |
595 | * Given the security context copy the low MLS categories into the NetLabel |
596 | * MLS category field. Returns zero on success, negative values on failure. | |
7420ed23 VY |
597 | * |
598 | */ | |
02752760 PM |
599 | int mls_export_netlbl_cat(struct context *context, |
600 | struct netlbl_lsm_secattr *secattr) | |
7420ed23 | 601 | { |
02752760 | 602 | int rc; |
7420ed23 | 603 | |
02752760 | 604 | if (!selinux_mls_enabled) |
7420ed23 VY |
605 | return 0; |
606 | ||
02752760 PM |
607 | rc = ebitmap_netlbl_export(&context->range.level[0].cat, |
608 | &secattr->mls_cat); | |
609 | if (rc == 0 && secattr->mls_cat != NULL) | |
610 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
7420ed23 | 611 | |
7420ed23 VY |
612 | return rc; |
613 | } | |
614 | ||
615 | /** | |
02752760 | 616 | * mls_import_netlbl_cat - Import the MLS categories from NetLabel |
7420ed23 | 617 | * @context: the security context |
02752760 | 618 | * @secattr: the NetLabel security attributes |
7420ed23 VY |
619 | * |
620 | * Description: | |
02752760 PM |
621 | * Copy the NetLabel security attributes into the SELinux context; since the |
622 | * NetLabel security attribute only contains a single MLS category use it for | |
623 | * both the low and high categories of the context. Returns zero on success, | |
624 | * negative values on failure. | |
7420ed23 VY |
625 | * |
626 | */ | |
02752760 PM |
627 | int mls_import_netlbl_cat(struct context *context, |
628 | struct netlbl_lsm_secattr *secattr) | |
7420ed23 | 629 | { |
02752760 | 630 | int rc; |
7420ed23 VY |
631 | |
632 | if (!selinux_mls_enabled) | |
633 | return 0; | |
634 | ||
02752760 PM |
635 | rc = ebitmap_netlbl_import(&context->range.level[0].cat, |
636 | secattr->mls_cat); | |
637 | if (rc != 0) | |
638 | goto import_netlbl_cat_failure; | |
639 | ||
640 | rc = ebitmap_cpy(&context->range.level[1].cat, | |
641 | &context->range.level[0].cat); | |
642 | if (rc != 0) | |
643 | goto import_netlbl_cat_failure; | |
7420ed23 VY |
644 | |
645 | return 0; | |
646 | ||
02752760 | 647 | import_netlbl_cat_failure: |
7420ed23 VY |
648 | ebitmap_destroy(&context->range.level[0].cat); |
649 | ebitmap_destroy(&context->range.level[1].cat); | |
650 | return rc; | |
651 | } | |
02752760 | 652 | #endif /* CONFIG_NETLABEL */ |