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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 | { | |
37 | int i, l, len, range; | |
782ebb99 | 38 | struct ebitmap_node *node; |
1da177e4 LT |
39 | |
40 | if (!selinux_mls_enabled) | |
41 | return 0; | |
42 | ||
43 | len = 1; /* for the beginning ":" */ | |
44 | for (l = 0; l < 2; l++) { | |
45 | range = 0; | |
46 | len += strlen(policydb.p_sens_val_to_name[context->range.level[l].sens - 1]); | |
47 | ||
782ebb99 SS |
48 | ebitmap_for_each_bit(&context->range.level[l].cat, node, i) { |
49 | if (ebitmap_node_get_bit(node, i)) { | |
1da177e4 LT |
50 | if (range) { |
51 | range++; | |
52 | continue; | |
53 | } | |
54 | ||
782ebb99 | 55 | len += strlen(policydb.p_cat_val_to_name[i]) + 1; |
1da177e4 LT |
56 | range++; |
57 | } else { | |
58 | if (range > 1) | |
782ebb99 | 59 | len += strlen(policydb.p_cat_val_to_name[i - 1]) + 1; |
1da177e4 LT |
60 | range = 0; |
61 | } | |
62 | } | |
63 | /* Handle case where last category is the end of range */ | |
64 | if (range > 1) | |
782ebb99 | 65 | len += strlen(policydb.p_cat_val_to_name[i - 1]) + 1; |
1da177e4 LT |
66 | |
67 | if (l == 0) { | |
68 | if (mls_level_eq(&context->range.level[0], | |
69 | &context->range.level[1])) | |
70 | break; | |
71 | else | |
72 | len++; | |
73 | } | |
74 | } | |
75 | ||
76 | return len; | |
77 | } | |
78 | ||
79 | /* | |
80 | * Write the security context string representation of | |
81 | * the MLS fields of `context' into the string `*scontext'. | |
82 | * Update `*scontext' to point to the end of the MLS fields. | |
83 | */ | |
84 | void mls_sid_to_context(struct context *context, | |
85 | char **scontext) | |
86 | { | |
87 | char *scontextp; | |
88 | int i, l, range, wrote_sep; | |
782ebb99 | 89 | struct ebitmap_node *node; |
1da177e4 LT |
90 | |
91 | if (!selinux_mls_enabled) | |
92 | return; | |
93 | ||
94 | scontextp = *scontext; | |
95 | ||
96 | *scontextp = ':'; | |
97 | scontextp++; | |
98 | ||
99 | for (l = 0; l < 2; l++) { | |
100 | range = 0; | |
101 | wrote_sep = 0; | |
102 | strcpy(scontextp, | |
103 | policydb.p_sens_val_to_name[context->range.level[l].sens - 1]); | |
104 | scontextp += strlen(policydb.p_sens_val_to_name[context->range.level[l].sens - 1]); | |
105 | ||
106 | /* categories */ | |
782ebb99 SS |
107 | ebitmap_for_each_bit(&context->range.level[l].cat, node, i) { |
108 | if (ebitmap_node_get_bit(node, i)) { | |
1da177e4 LT |
109 | if (range) { |
110 | range++; | |
111 | continue; | |
112 | } | |
113 | ||
114 | if (!wrote_sep) { | |
115 | *scontextp++ = ':'; | |
116 | wrote_sep = 1; | |
117 | } else | |
118 | *scontextp++ = ','; | |
782ebb99 SS |
119 | strcpy(scontextp, policydb.p_cat_val_to_name[i]); |
120 | scontextp += strlen(policydb.p_cat_val_to_name[i]); | |
1da177e4 LT |
121 | range++; |
122 | } else { | |
123 | if (range > 1) { | |
124 | if (range > 2) | |
125 | *scontextp++ = '.'; | |
126 | else | |
127 | *scontextp++ = ','; | |
128 | ||
782ebb99 SS |
129 | strcpy(scontextp, policydb.p_cat_val_to_name[i - 1]); |
130 | scontextp += strlen(policydb.p_cat_val_to_name[i - 1]); | |
1da177e4 LT |
131 | } |
132 | range = 0; | |
133 | } | |
134 | } | |
135 | ||
136 | /* Handle case where last category is the end of range */ | |
137 | if (range > 1) { | |
138 | if (range > 2) | |
139 | *scontextp++ = '.'; | |
140 | else | |
141 | *scontextp++ = ','; | |
142 | ||
782ebb99 SS |
143 | strcpy(scontextp, policydb.p_cat_val_to_name[i - 1]); |
144 | scontextp += strlen(policydb.p_cat_val_to_name[i - 1]); | |
1da177e4 LT |
145 | } |
146 | ||
147 | if (l == 0) { | |
148 | if (mls_level_eq(&context->range.level[0], | |
149 | &context->range.level[1])) | |
150 | break; | |
151 | else { | |
152 | *scontextp = '-'; | |
153 | scontextp++; | |
154 | } | |
155 | } | |
156 | } | |
157 | ||
158 | *scontext = scontextp; | |
159 | return; | |
160 | } | |
161 | ||
162 | /* | |
163 | * Return 1 if the MLS fields in the security context | |
164 | * structure `c' are valid. Return 0 otherwise. | |
165 | */ | |
166 | int mls_context_isvalid(struct policydb *p, struct context *c) | |
167 | { | |
168 | struct level_datum *levdatum; | |
169 | struct user_datum *usrdatum; | |
782ebb99 | 170 | struct ebitmap_node *node; |
1da177e4 LT |
171 | int i, l; |
172 | ||
173 | if (!selinux_mls_enabled) | |
174 | return 1; | |
175 | ||
176 | /* | |
177 | * MLS range validity checks: high must dominate low, low level must | |
178 | * be valid (category set <-> sensitivity check), and high level must | |
179 | * be valid (category set <-> sensitivity check) | |
180 | */ | |
181 | if (!mls_level_dom(&c->range.level[1], &c->range.level[0])) | |
182 | /* High does not dominate low. */ | |
183 | return 0; | |
184 | ||
185 | for (l = 0; l < 2; l++) { | |
186 | if (!c->range.level[l].sens || c->range.level[l].sens > p->p_levels.nprim) | |
187 | return 0; | |
188 | levdatum = hashtab_search(p->p_levels.table, | |
189 | p->p_sens_val_to_name[c->range.level[l].sens - 1]); | |
190 | if (!levdatum) | |
191 | return 0; | |
192 | ||
782ebb99 SS |
193 | ebitmap_for_each_bit(&c->range.level[l].cat, node, i) { |
194 | if (ebitmap_node_get_bit(node, i)) { | |
1da177e4 LT |
195 | if (i > p->p_cats.nprim) |
196 | return 0; | |
782ebb99 | 197 | if (!ebitmap_get_bit(&levdatum->level->cat, i)) |
1da177e4 LT |
198 | /* |
199 | * Category may not be associated with | |
200 | * sensitivity in low level. | |
201 | */ | |
202 | return 0; | |
203 | } | |
204 | } | |
205 | } | |
206 | ||
207 | if (c->role == OBJECT_R_VAL) | |
208 | return 1; | |
209 | ||
210 | /* | |
211 | * User must be authorized for the MLS range. | |
212 | */ | |
213 | if (!c->user || c->user > p->p_users.nprim) | |
214 | return 0; | |
215 | usrdatum = p->user_val_to_struct[c->user - 1]; | |
216 | if (!mls_range_contains(usrdatum->range, c->range)) | |
217 | return 0; /* user may not be associated with range */ | |
218 | ||
219 | return 1; | |
220 | } | |
221 | ||
222 | /* | |
223 | * Set the MLS fields in the security context structure | |
224 | * `context' based on the string representation in | |
225 | * the string `*scontext'. Update `*scontext' to | |
226 | * point to the end of the string representation of | |
227 | * the MLS fields. | |
228 | * | |
229 | * This function modifies the string in place, inserting | |
230 | * NULL characters to terminate the MLS fields. | |
f5c1d5b2 JM |
231 | * |
232 | * If a def_sid is provided and no MLS field is present, | |
233 | * copy the MLS field of the associated default context. | |
234 | * Used for upgraded to MLS systems where objects may lack | |
235 | * MLS fields. | |
236 | * | |
237 | * Policy read-lock must be held for sidtab lookup. | |
238 | * | |
1da177e4 LT |
239 | */ |
240 | int mls_context_to_sid(char oldc, | |
241 | char **scontext, | |
f5c1d5b2 JM |
242 | struct context *context, |
243 | struct sidtab *s, | |
244 | u32 def_sid) | |
1da177e4 LT |
245 | { |
246 | ||
247 | char delim; | |
248 | char *scontextp, *p, *rngptr; | |
249 | struct level_datum *levdatum; | |
250 | struct cat_datum *catdatum, *rngdatum; | |
251 | int l, rc = -EINVAL; | |
252 | ||
e517a0cd SS |
253 | if (!selinux_mls_enabled) { |
254 | if (def_sid != SECSID_NULL && oldc) | |
ab5703b3 | 255 | *scontext += strlen(*scontext)+1; |
1da177e4 | 256 | return 0; |
e517a0cd | 257 | } |
1da177e4 | 258 | |
f5c1d5b2 JM |
259 | /* |
260 | * No MLS component to the security context, try and map to | |
261 | * default if provided. | |
262 | */ | |
263 | if (!oldc) { | |
264 | struct context *defcon; | |
265 | ||
266 | if (def_sid == SECSID_NULL) | |
267 | goto out; | |
268 | ||
269 | defcon = sidtab_search(s, def_sid); | |
270 | if (!defcon) | |
271 | goto out; | |
272 | ||
273 | rc = mls_copy_context(context, defcon); | |
1da177e4 | 274 | goto out; |
f5c1d5b2 | 275 | } |
1da177e4 LT |
276 | |
277 | /* Extract low sensitivity. */ | |
278 | scontextp = p = *scontext; | |
279 | while (*p && *p != ':' && *p != '-') | |
280 | p++; | |
281 | ||
282 | delim = *p; | |
283 | if (delim != 0) | |
284 | *p++ = 0; | |
285 | ||
286 | for (l = 0; l < 2; l++) { | |
287 | levdatum = hashtab_search(policydb.p_levels.table, scontextp); | |
288 | if (!levdatum) { | |
289 | rc = -EINVAL; | |
290 | goto out; | |
291 | } | |
292 | ||
293 | context->range.level[l].sens = levdatum->level->sens; | |
294 | ||
295 | if (delim == ':') { | |
296 | /* Extract category set. */ | |
297 | while (1) { | |
298 | scontextp = p; | |
299 | while (*p && *p != ',' && *p != '-') | |
300 | p++; | |
301 | delim = *p; | |
302 | if (delim != 0) | |
303 | *p++ = 0; | |
304 | ||
305 | /* Separate into range if exists */ | |
306 | if ((rngptr = strchr(scontextp, '.')) != NULL) { | |
307 | /* Remove '.' */ | |
308 | *rngptr++ = 0; | |
309 | } | |
310 | ||
311 | catdatum = hashtab_search(policydb.p_cats.table, | |
312 | scontextp); | |
313 | if (!catdatum) { | |
314 | rc = -EINVAL; | |
315 | goto out; | |
316 | } | |
317 | ||
318 | rc = ebitmap_set_bit(&context->range.level[l].cat, | |
319 | catdatum->value - 1, 1); | |
320 | if (rc) | |
321 | goto out; | |
322 | ||
323 | /* If range, set all categories in range */ | |
324 | if (rngptr) { | |
325 | int i; | |
326 | ||
327 | rngdatum = hashtab_search(policydb.p_cats.table, rngptr); | |
328 | if (!rngdatum) { | |
329 | rc = -EINVAL; | |
330 | goto out; | |
331 | } | |
332 | ||
333 | if (catdatum->value >= rngdatum->value) { | |
334 | rc = -EINVAL; | |
335 | goto out; | |
336 | } | |
337 | ||
338 | for (i = catdatum->value; i < rngdatum->value; i++) { | |
339 | rc = ebitmap_set_bit(&context->range.level[l].cat, i, 1); | |
340 | if (rc) | |
341 | goto out; | |
342 | } | |
343 | } | |
344 | ||
345 | if (delim != ',') | |
346 | break; | |
347 | } | |
348 | } | |
349 | if (delim == '-') { | |
350 | /* Extract high sensitivity. */ | |
351 | scontextp = p; | |
352 | while (*p && *p != ':') | |
353 | p++; | |
354 | ||
355 | delim = *p; | |
356 | if (delim != 0) | |
357 | *p++ = 0; | |
358 | } else | |
359 | break; | |
360 | } | |
361 | ||
362 | if (l == 0) { | |
363 | context->range.level[1].sens = context->range.level[0].sens; | |
364 | rc = ebitmap_cpy(&context->range.level[1].cat, | |
365 | &context->range.level[0].cat); | |
366 | if (rc) | |
367 | goto out; | |
368 | } | |
369 | *scontext = ++p; | |
370 | rc = 0; | |
371 | out: | |
372 | return rc; | |
373 | } | |
374 | ||
376bd9cb DG |
375 | /* |
376 | * Set the MLS fields in the security context structure | |
377 | * `context' based on the string representation in | |
378 | * the string `str'. This function will allocate temporary memory with the | |
379 | * given constraints of gfp_mask. | |
380 | */ | |
381 | int mls_from_string(char *str, struct context *context, gfp_t gfp_mask) | |
382 | { | |
383 | char *tmpstr, *freestr; | |
384 | int rc; | |
385 | ||
386 | if (!selinux_mls_enabled) | |
387 | return -EINVAL; | |
388 | ||
389 | /* we need freestr because mls_context_to_sid will change | |
390 | the value of tmpstr */ | |
391 | tmpstr = freestr = kstrdup(str, gfp_mask); | |
392 | if (!tmpstr) { | |
393 | rc = -ENOMEM; | |
394 | } else { | |
395 | rc = mls_context_to_sid(':', &tmpstr, context, | |
396 | NULL, SECSID_NULL); | |
397 | kfree(freestr); | |
398 | } | |
399 | ||
400 | return rc; | |
401 | } | |
402 | ||
1da177e4 LT |
403 | /* |
404 | * Copies the effective MLS range from `src' into `dst'. | |
405 | */ | |
406 | static inline int mls_scopy_context(struct context *dst, | |
407 | struct context *src) | |
408 | { | |
409 | int l, rc = 0; | |
410 | ||
411 | /* Copy the MLS range from the source context */ | |
412 | for (l = 0; l < 2; l++) { | |
413 | dst->range.level[l].sens = src->range.level[0].sens; | |
414 | rc = ebitmap_cpy(&dst->range.level[l].cat, | |
415 | &src->range.level[0].cat); | |
416 | if (rc) | |
417 | break; | |
418 | } | |
419 | ||
420 | return rc; | |
421 | } | |
422 | ||
423 | /* | |
424 | * Copies the MLS range `range' into `context'. | |
425 | */ | |
426 | static inline int mls_range_set(struct context *context, | |
427 | struct mls_range *range) | |
428 | { | |
429 | int l, rc = 0; | |
430 | ||
431 | /* Copy the MLS range into the context */ | |
432 | for (l = 0; l < 2; l++) { | |
433 | context->range.level[l].sens = range->level[l].sens; | |
434 | rc = ebitmap_cpy(&context->range.level[l].cat, | |
435 | &range->level[l].cat); | |
436 | if (rc) | |
437 | break; | |
438 | } | |
439 | ||
440 | return rc; | |
441 | } | |
442 | ||
443 | int mls_setup_user_range(struct context *fromcon, struct user_datum *user, | |
444 | struct context *usercon) | |
445 | { | |
446 | if (selinux_mls_enabled) { | |
447 | struct mls_level *fromcon_sen = &(fromcon->range.level[0]); | |
448 | struct mls_level *fromcon_clr = &(fromcon->range.level[1]); | |
449 | struct mls_level *user_low = &(user->range.level[0]); | |
450 | struct mls_level *user_clr = &(user->range.level[1]); | |
451 | struct mls_level *user_def = &(user->dfltlevel); | |
452 | struct mls_level *usercon_sen = &(usercon->range.level[0]); | |
453 | struct mls_level *usercon_clr = &(usercon->range.level[1]); | |
454 | ||
455 | /* Honor the user's default level if we can */ | |
456 | if (mls_level_between(user_def, fromcon_sen, fromcon_clr)) { | |
457 | *usercon_sen = *user_def; | |
458 | } else if (mls_level_between(fromcon_sen, user_def, user_clr)) { | |
459 | *usercon_sen = *fromcon_sen; | |
460 | } else if (mls_level_between(fromcon_clr, user_low, user_def)) { | |
461 | *usercon_sen = *user_low; | |
462 | } else | |
463 | return -EINVAL; | |
464 | ||
465 | /* Lower the clearance of available contexts | |
466 | if the clearance of "fromcon" is lower than | |
467 | that of the user's default clearance (but | |
468 | only if the "fromcon" clearance dominates | |
469 | the user's computed sensitivity level) */ | |
470 | if (mls_level_dom(user_clr, fromcon_clr)) { | |
471 | *usercon_clr = *fromcon_clr; | |
472 | } else if (mls_level_dom(fromcon_clr, user_clr)) { | |
473 | *usercon_clr = *user_clr; | |
474 | } else | |
475 | return -EINVAL; | |
476 | } | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
481 | /* | |
482 | * Convert the MLS fields in the security context | |
483 | * structure `c' from the values specified in the | |
484 | * policy `oldp' to the values specified in the policy `newp'. | |
485 | */ | |
486 | int mls_convert_context(struct policydb *oldp, | |
487 | struct policydb *newp, | |
488 | struct context *c) | |
489 | { | |
490 | struct level_datum *levdatum; | |
491 | struct cat_datum *catdatum; | |
492 | struct ebitmap bitmap; | |
782ebb99 | 493 | struct ebitmap_node *node; |
1da177e4 LT |
494 | int l, i; |
495 | ||
496 | if (!selinux_mls_enabled) | |
497 | return 0; | |
498 | ||
499 | for (l = 0; l < 2; l++) { | |
500 | levdatum = hashtab_search(newp->p_levels.table, | |
501 | oldp->p_sens_val_to_name[c->range.level[l].sens - 1]); | |
502 | ||
503 | if (!levdatum) | |
504 | return -EINVAL; | |
505 | c->range.level[l].sens = levdatum->level->sens; | |
506 | ||
507 | ebitmap_init(&bitmap); | |
782ebb99 SS |
508 | ebitmap_for_each_bit(&c->range.level[l].cat, node, i) { |
509 | if (ebitmap_node_get_bit(node, i)) { | |
1da177e4 LT |
510 | int rc; |
511 | ||
512 | catdatum = hashtab_search(newp->p_cats.table, | |
782ebb99 | 513 | oldp->p_cat_val_to_name[i]); |
1da177e4 LT |
514 | if (!catdatum) |
515 | return -EINVAL; | |
516 | rc = ebitmap_set_bit(&bitmap, catdatum->value - 1, 1); | |
517 | if (rc) | |
518 | return rc; | |
519 | } | |
520 | } | |
521 | ebitmap_destroy(&c->range.level[l].cat); | |
522 | c->range.level[l].cat = bitmap; | |
523 | } | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | int mls_compute_sid(struct context *scontext, | |
529 | struct context *tcontext, | |
530 | u16 tclass, | |
531 | u32 specified, | |
532 | struct context *newcontext) | |
533 | { | |
f3f87714 DG |
534 | struct range_trans *rtr; |
535 | ||
1da177e4 LT |
536 | if (!selinux_mls_enabled) |
537 | return 0; | |
538 | ||
539 | switch (specified) { | |
540 | case AVTAB_TRANSITION: | |
f3f87714 DG |
541 | /* Look for a range transition rule. */ |
542 | for (rtr = policydb.range_tr; rtr; rtr = rtr->next) { | |
543 | if (rtr->source_type == scontext->type && | |
544 | rtr->target_type == tcontext->type && | |
545 | rtr->target_class == tclass) { | |
546 | /* Set the range from the rule */ | |
547 | return mls_range_set(newcontext, | |
548 | &rtr->target_range); | |
1da177e4 LT |
549 | } |
550 | } | |
551 | /* Fallthrough */ | |
552 | case AVTAB_CHANGE: | |
553 | if (tclass == SECCLASS_PROCESS) | |
554 | /* Use the process MLS attributes. */ | |
555 | return mls_copy_context(newcontext, scontext); | |
556 | else | |
557 | /* Use the process effective MLS attributes. */ | |
558 | return mls_scopy_context(newcontext, scontext); | |
559 | case AVTAB_MEMBER: | |
560 | /* Only polyinstantiate the MLS attributes if | |
561 | the type is being polyinstantiated */ | |
562 | if (newcontext->type != tcontext->type) { | |
563 | /* Use the process effective MLS attributes. */ | |
564 | return mls_scopy_context(newcontext, scontext); | |
565 | } else { | |
566 | /* Use the related object MLS attributes. */ | |
567 | return mls_copy_context(newcontext, tcontext); | |
568 | } | |
569 | default: | |
570 | return -EINVAL; | |
571 | } | |
572 | return -EINVAL; | |
573 | } | |
574 | ||
02752760 | 575 | #ifdef CONFIG_NETLABEL |
7420ed23 | 576 | /** |
02752760 | 577 | * mls_export_netlbl_lvl - Export the MLS sensitivity levels to NetLabel |
7420ed23 | 578 | * @context: the security context |
02752760 | 579 | * @secattr: the NetLabel security attributes |
7420ed23 VY |
580 | * |
581 | * Description: | |
02752760 PM |
582 | * Given the security context copy the low MLS sensitivity level into the |
583 | * NetLabel MLS sensitivity level field. | |
7420ed23 VY |
584 | * |
585 | */ | |
02752760 PM |
586 | void mls_export_netlbl_lvl(struct context *context, |
587 | struct netlbl_lsm_secattr *secattr) | |
7420ed23 VY |
588 | { |
589 | if (!selinux_mls_enabled) | |
590 | return; | |
591 | ||
02752760 PM |
592 | secattr->mls_lvl = context->range.level[0].sens - 1; |
593 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; | |
7420ed23 VY |
594 | } |
595 | ||
596 | /** | |
02752760 | 597 | * mls_import_netlbl_lvl - Import the NetLabel MLS sensitivity levels |
7420ed23 | 598 | * @context: the security context |
02752760 | 599 | * @secattr: the NetLabel security attributes |
7420ed23 VY |
600 | * |
601 | * Description: | |
02752760 PM |
602 | * Given the security context and the NetLabel security attributes, copy the |
603 | * NetLabel MLS sensitivity level into the context. | |
7420ed23 VY |
604 | * |
605 | */ | |
02752760 PM |
606 | void mls_import_netlbl_lvl(struct context *context, |
607 | struct netlbl_lsm_secattr *secattr) | |
7420ed23 VY |
608 | { |
609 | if (!selinux_mls_enabled) | |
610 | return; | |
611 | ||
02752760 PM |
612 | context->range.level[0].sens = secattr->mls_lvl + 1; |
613 | context->range.level[1].sens = context->range.level[0].sens; | |
7420ed23 VY |
614 | } |
615 | ||
616 | /** | |
02752760 | 617 | * mls_export_netlbl_cat - Export the MLS categories to NetLabel |
7420ed23 | 618 | * @context: the security context |
02752760 | 619 | * @secattr: the NetLabel security attributes |
7420ed23 VY |
620 | * |
621 | * Description: | |
02752760 PM |
622 | * Given the security context copy the low MLS categories into the NetLabel |
623 | * MLS category field. Returns zero on success, negative values on failure. | |
7420ed23 VY |
624 | * |
625 | */ | |
02752760 PM |
626 | int mls_export_netlbl_cat(struct context *context, |
627 | struct netlbl_lsm_secattr *secattr) | |
7420ed23 | 628 | { |
02752760 | 629 | int rc; |
7420ed23 | 630 | |
02752760 | 631 | if (!selinux_mls_enabled) |
7420ed23 VY |
632 | return 0; |
633 | ||
02752760 PM |
634 | rc = ebitmap_netlbl_export(&context->range.level[0].cat, |
635 | &secattr->mls_cat); | |
636 | if (rc == 0 && secattr->mls_cat != NULL) | |
637 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
7420ed23 | 638 | |
7420ed23 VY |
639 | return rc; |
640 | } | |
641 | ||
642 | /** | |
02752760 | 643 | * mls_import_netlbl_cat - Import the MLS categories from NetLabel |
7420ed23 | 644 | * @context: the security context |
02752760 | 645 | * @secattr: the NetLabel security attributes |
7420ed23 VY |
646 | * |
647 | * Description: | |
02752760 PM |
648 | * Copy the NetLabel security attributes into the SELinux context; since the |
649 | * NetLabel security attribute only contains a single MLS category use it for | |
650 | * both the low and high categories of the context. Returns zero on success, | |
651 | * negative values on failure. | |
7420ed23 VY |
652 | * |
653 | */ | |
02752760 PM |
654 | int mls_import_netlbl_cat(struct context *context, |
655 | struct netlbl_lsm_secattr *secattr) | |
7420ed23 | 656 | { |
02752760 | 657 | int rc; |
7420ed23 VY |
658 | |
659 | if (!selinux_mls_enabled) | |
660 | return 0; | |
661 | ||
02752760 PM |
662 | rc = ebitmap_netlbl_import(&context->range.level[0].cat, |
663 | secattr->mls_cat); | |
664 | if (rc != 0) | |
665 | goto import_netlbl_cat_failure; | |
666 | ||
667 | rc = ebitmap_cpy(&context->range.level[1].cat, | |
668 | &context->range.level[0].cat); | |
669 | if (rc != 0) | |
670 | goto import_netlbl_cat_failure; | |
7420ed23 VY |
671 | |
672 | return 0; | |
673 | ||
02752760 | 674 | import_netlbl_cat_failure: |
7420ed23 VY |
675 | ebitmap_destroy(&context->range.level[0].cat); |
676 | ebitmap_destroy(&context->range.level[1].cat); | |
677 | return rc; | |
678 | } | |
02752760 | 679 | #endif /* CONFIG_NETLABEL */ |