Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Implementation of the security services. | |
3 | * | |
4 | * Authors : Stephen Smalley, <sds@epoch.ncsc.mil> | |
5 | * James Morris <jmorris@redhat.com> | |
6 | * | |
7 | * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> | |
8 | * | |
9 | * Support for enhanced MLS infrastructure. | |
376bd9cb | 10 | * Support for context based audit filters. |
1da177e4 LT |
11 | * |
12 | * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> | |
13 | * | |
14 | * Added conditional policy language extensions | |
15 | * | |
7420ed23 VY |
16 | * Updated: Hewlett-Packard <paul.moore@hp.com> |
17 | * | |
18 | * Added support for NetLabel | |
19 | * | |
b94c7e67 CS |
20 | * Updated: Chad Sellers <csellers@tresys.com> |
21 | * | |
22 | * Added validation of kernel classes and permissions | |
23 | * | |
7420ed23 | 24 | * Copyright (C) 2006 Hewlett-Packard Development Company, L.P. |
376bd9cb | 25 | * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. |
b94c7e67 | 26 | * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC |
1da177e4 LT |
27 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> |
28 | * This program is free software; you can redistribute it and/or modify | |
29 | * it under the terms of the GNU General Public License as published by | |
30 | * the Free Software Foundation, version 2. | |
31 | */ | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/string.h> | |
35 | #include <linux/spinlock.h> | |
9f2ad665 | 36 | #include <linux/rcupdate.h> |
1da177e4 LT |
37 | #include <linux/errno.h> |
38 | #include <linux/in.h> | |
39 | #include <linux/sched.h> | |
40 | #include <linux/audit.h> | |
bb003079 | 41 | #include <linux/mutex.h> |
7420ed23 | 42 | #include <net/netlabel.h> |
bb003079 | 43 | |
1da177e4 LT |
44 | #include "flask.h" |
45 | #include "avc.h" | |
46 | #include "avc_ss.h" | |
47 | #include "security.h" | |
48 | #include "context.h" | |
49 | #include "policydb.h" | |
50 | #include "sidtab.h" | |
51 | #include "services.h" | |
52 | #include "conditional.h" | |
53 | #include "mls.h" | |
7420ed23 | 54 | #include "objsec.h" |
c60475bf | 55 | #include "netlabel.h" |
3de4bab5 | 56 | #include "xfrm.h" |
02752760 | 57 | #include "ebitmap.h" |
1da177e4 LT |
58 | |
59 | extern void selnl_notify_policyload(u32 seqno); | |
60 | unsigned int policydb_loaded_version; | |
61 | ||
b94c7e67 CS |
62 | /* |
63 | * This is declared in avc.c | |
64 | */ | |
65 | extern const struct selinux_class_perm selinux_class_perm; | |
66 | ||
1da177e4 LT |
67 | static DEFINE_RWLOCK(policy_rwlock); |
68 | #define POLICY_RDLOCK read_lock(&policy_rwlock) | |
69 | #define POLICY_WRLOCK write_lock_irq(&policy_rwlock) | |
70 | #define POLICY_RDUNLOCK read_unlock(&policy_rwlock) | |
71 | #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock) | |
72 | ||
bb003079 IM |
73 | static DEFINE_MUTEX(load_mutex); |
74 | #define LOAD_LOCK mutex_lock(&load_mutex) | |
75 | #define LOAD_UNLOCK mutex_unlock(&load_mutex) | |
1da177e4 LT |
76 | |
77 | static struct sidtab sidtab; | |
78 | struct policydb policydb; | |
79 | int ss_initialized = 0; | |
80 | ||
81 | /* | |
82 | * The largest sequence number that has been used when | |
83 | * providing an access decision to the access vector cache. | |
84 | * The sequence number only changes when a policy change | |
85 | * occurs. | |
86 | */ | |
87 | static u32 latest_granting = 0; | |
88 | ||
89 | /* Forward declaration. */ | |
90 | static int context_struct_to_string(struct context *context, char **scontext, | |
91 | u32 *scontext_len); | |
92 | ||
93 | /* | |
94 | * Return the boolean value of a constraint expression | |
95 | * when it is applied to the specified source and target | |
96 | * security contexts. | |
97 | * | |
98 | * xcontext is a special beast... It is used by the validatetrans rules | |
99 | * only. For these rules, scontext is the context before the transition, | |
100 | * tcontext is the context after the transition, and xcontext is the context | |
101 | * of the process performing the transition. All other callers of | |
102 | * constraint_expr_eval should pass in NULL for xcontext. | |
103 | */ | |
104 | static int constraint_expr_eval(struct context *scontext, | |
105 | struct context *tcontext, | |
106 | struct context *xcontext, | |
107 | struct constraint_expr *cexpr) | |
108 | { | |
109 | u32 val1, val2; | |
110 | struct context *c; | |
111 | struct role_datum *r1, *r2; | |
112 | struct mls_level *l1, *l2; | |
113 | struct constraint_expr *e; | |
114 | int s[CEXPR_MAXDEPTH]; | |
115 | int sp = -1; | |
116 | ||
117 | for (e = cexpr; e; e = e->next) { | |
118 | switch (e->expr_type) { | |
119 | case CEXPR_NOT: | |
120 | BUG_ON(sp < 0); | |
121 | s[sp] = !s[sp]; | |
122 | break; | |
123 | case CEXPR_AND: | |
124 | BUG_ON(sp < 1); | |
125 | sp--; | |
126 | s[sp] &= s[sp+1]; | |
127 | break; | |
128 | case CEXPR_OR: | |
129 | BUG_ON(sp < 1); | |
130 | sp--; | |
131 | s[sp] |= s[sp+1]; | |
132 | break; | |
133 | case CEXPR_ATTR: | |
134 | if (sp == (CEXPR_MAXDEPTH-1)) | |
135 | return 0; | |
136 | switch (e->attr) { | |
137 | case CEXPR_USER: | |
138 | val1 = scontext->user; | |
139 | val2 = tcontext->user; | |
140 | break; | |
141 | case CEXPR_TYPE: | |
142 | val1 = scontext->type; | |
143 | val2 = tcontext->type; | |
144 | break; | |
145 | case CEXPR_ROLE: | |
146 | val1 = scontext->role; | |
147 | val2 = tcontext->role; | |
148 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
149 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
150 | switch (e->op) { | |
151 | case CEXPR_DOM: | |
152 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
153 | val2 - 1); | |
154 | continue; | |
155 | case CEXPR_DOMBY: | |
156 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
157 | val1 - 1); | |
158 | continue; | |
159 | case CEXPR_INCOMP: | |
160 | s[++sp] = ( !ebitmap_get_bit(&r1->dominates, | |
161 | val2 - 1) && | |
162 | !ebitmap_get_bit(&r2->dominates, | |
163 | val1 - 1) ); | |
164 | continue; | |
165 | default: | |
166 | break; | |
167 | } | |
168 | break; | |
169 | case CEXPR_L1L2: | |
170 | l1 = &(scontext->range.level[0]); | |
171 | l2 = &(tcontext->range.level[0]); | |
172 | goto mls_ops; | |
173 | case CEXPR_L1H2: | |
174 | l1 = &(scontext->range.level[0]); | |
175 | l2 = &(tcontext->range.level[1]); | |
176 | goto mls_ops; | |
177 | case CEXPR_H1L2: | |
178 | l1 = &(scontext->range.level[1]); | |
179 | l2 = &(tcontext->range.level[0]); | |
180 | goto mls_ops; | |
181 | case CEXPR_H1H2: | |
182 | l1 = &(scontext->range.level[1]); | |
183 | l2 = &(tcontext->range.level[1]); | |
184 | goto mls_ops; | |
185 | case CEXPR_L1H1: | |
186 | l1 = &(scontext->range.level[0]); | |
187 | l2 = &(scontext->range.level[1]); | |
188 | goto mls_ops; | |
189 | case CEXPR_L2H2: | |
190 | l1 = &(tcontext->range.level[0]); | |
191 | l2 = &(tcontext->range.level[1]); | |
192 | goto mls_ops; | |
193 | mls_ops: | |
194 | switch (e->op) { | |
195 | case CEXPR_EQ: | |
196 | s[++sp] = mls_level_eq(l1, l2); | |
197 | continue; | |
198 | case CEXPR_NEQ: | |
199 | s[++sp] = !mls_level_eq(l1, l2); | |
200 | continue; | |
201 | case CEXPR_DOM: | |
202 | s[++sp] = mls_level_dom(l1, l2); | |
203 | continue; | |
204 | case CEXPR_DOMBY: | |
205 | s[++sp] = mls_level_dom(l2, l1); | |
206 | continue; | |
207 | case CEXPR_INCOMP: | |
208 | s[++sp] = mls_level_incomp(l2, l1); | |
209 | continue; | |
210 | default: | |
211 | BUG(); | |
212 | return 0; | |
213 | } | |
214 | break; | |
215 | default: | |
216 | BUG(); | |
217 | return 0; | |
218 | } | |
219 | ||
220 | switch (e->op) { | |
221 | case CEXPR_EQ: | |
222 | s[++sp] = (val1 == val2); | |
223 | break; | |
224 | case CEXPR_NEQ: | |
225 | s[++sp] = (val1 != val2); | |
226 | break; | |
227 | default: | |
228 | BUG(); | |
229 | return 0; | |
230 | } | |
231 | break; | |
232 | case CEXPR_NAMES: | |
233 | if (sp == (CEXPR_MAXDEPTH-1)) | |
234 | return 0; | |
235 | c = scontext; | |
236 | if (e->attr & CEXPR_TARGET) | |
237 | c = tcontext; | |
238 | else if (e->attr & CEXPR_XTARGET) { | |
239 | c = xcontext; | |
240 | if (!c) { | |
241 | BUG(); | |
242 | return 0; | |
243 | } | |
244 | } | |
245 | if (e->attr & CEXPR_USER) | |
246 | val1 = c->user; | |
247 | else if (e->attr & CEXPR_ROLE) | |
248 | val1 = c->role; | |
249 | else if (e->attr & CEXPR_TYPE) | |
250 | val1 = c->type; | |
251 | else { | |
252 | BUG(); | |
253 | return 0; | |
254 | } | |
255 | ||
256 | switch (e->op) { | |
257 | case CEXPR_EQ: | |
258 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
259 | break; | |
260 | case CEXPR_NEQ: | |
261 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
262 | break; | |
263 | default: | |
264 | BUG(); | |
265 | return 0; | |
266 | } | |
267 | break; | |
268 | default: | |
269 | BUG(); | |
270 | return 0; | |
271 | } | |
272 | } | |
273 | ||
274 | BUG_ON(sp != 0); | |
275 | return s[0]; | |
276 | } | |
277 | ||
278 | /* | |
279 | * Compute access vectors based on a context structure pair for | |
280 | * the permissions in a particular class. | |
281 | */ | |
282 | static int context_struct_compute_av(struct context *scontext, | |
283 | struct context *tcontext, | |
284 | u16 tclass, | |
285 | u32 requested, | |
286 | struct av_decision *avd) | |
287 | { | |
288 | struct constraint_node *constraint; | |
289 | struct role_allow *ra; | |
290 | struct avtab_key avkey; | |
782ebb99 | 291 | struct avtab_node *node; |
1da177e4 | 292 | struct class_datum *tclass_datum; |
782ebb99 SS |
293 | struct ebitmap *sattr, *tattr; |
294 | struct ebitmap_node *snode, *tnode; | |
295 | unsigned int i, j; | |
1da177e4 LT |
296 | |
297 | /* | |
298 | * Remap extended Netlink classes for old policy versions. | |
299 | * Do this here rather than socket_type_to_security_class() | |
300 | * in case a newer policy version is loaded, allowing sockets | |
301 | * to remain in the correct class. | |
302 | */ | |
303 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
304 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
305 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
306 | tclass = SECCLASS_NETLINK_SOCKET; | |
307 | ||
308 | if (!tclass || tclass > policydb.p_classes.nprim) { | |
309 | printk(KERN_ERR "security_compute_av: unrecognized class %d\n", | |
310 | tclass); | |
311 | return -EINVAL; | |
312 | } | |
313 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
314 | ||
315 | /* | |
316 | * Initialize the access vectors to the default values. | |
317 | */ | |
318 | avd->allowed = 0; | |
319 | avd->decided = 0xffffffff; | |
320 | avd->auditallow = 0; | |
321 | avd->auditdeny = 0xffffffff; | |
322 | avd->seqno = latest_granting; | |
323 | ||
324 | /* | |
325 | * If a specific type enforcement rule was defined for | |
326 | * this permission check, then use it. | |
327 | */ | |
1da177e4 | 328 | avkey.target_class = tclass; |
782ebb99 SS |
329 | avkey.specified = AVTAB_AV; |
330 | sattr = &policydb.type_attr_map[scontext->type - 1]; | |
331 | tattr = &policydb.type_attr_map[tcontext->type - 1]; | |
332 | ebitmap_for_each_bit(sattr, snode, i) { | |
333 | if (!ebitmap_node_get_bit(snode, i)) | |
334 | continue; | |
335 | ebitmap_for_each_bit(tattr, tnode, j) { | |
336 | if (!ebitmap_node_get_bit(tnode, j)) | |
337 | continue; | |
338 | avkey.source_type = i + 1; | |
339 | avkey.target_type = j + 1; | |
340 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
341 | node != NULL; | |
342 | node = avtab_search_node_next(node, avkey.specified)) { | |
343 | if (node->key.specified == AVTAB_ALLOWED) | |
344 | avd->allowed |= node->datum.data; | |
345 | else if (node->key.specified == AVTAB_AUDITALLOW) | |
346 | avd->auditallow |= node->datum.data; | |
347 | else if (node->key.specified == AVTAB_AUDITDENY) | |
348 | avd->auditdeny &= node->datum.data; | |
349 | } | |
1da177e4 | 350 | |
782ebb99 SS |
351 | /* Check conditional av table for additional permissions */ |
352 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); | |
353 | ||
354 | } | |
355 | } | |
1da177e4 LT |
356 | |
357 | /* | |
358 | * Remove any permissions prohibited by a constraint (this includes | |
359 | * the MLS policy). | |
360 | */ | |
361 | constraint = tclass_datum->constraints; | |
362 | while (constraint) { | |
363 | if ((constraint->permissions & (avd->allowed)) && | |
364 | !constraint_expr_eval(scontext, tcontext, NULL, | |
365 | constraint->expr)) { | |
366 | avd->allowed = (avd->allowed) & ~(constraint->permissions); | |
367 | } | |
368 | constraint = constraint->next; | |
369 | } | |
370 | ||
371 | /* | |
372 | * If checking process transition permission and the | |
373 | * role is changing, then check the (current_role, new_role) | |
374 | * pair. | |
375 | */ | |
376 | if (tclass == SECCLASS_PROCESS && | |
377 | (avd->allowed & (PROCESS__TRANSITION | PROCESS__DYNTRANSITION)) && | |
378 | scontext->role != tcontext->role) { | |
379 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
380 | if (scontext->role == ra->role && | |
381 | tcontext->role == ra->new_role) | |
382 | break; | |
383 | } | |
384 | if (!ra) | |
385 | avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION | | |
386 | PROCESS__DYNTRANSITION); | |
387 | } | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | static int security_validtrans_handle_fail(struct context *ocontext, | |
393 | struct context *ncontext, | |
394 | struct context *tcontext, | |
395 | u16 tclass) | |
396 | { | |
397 | char *o = NULL, *n = NULL, *t = NULL; | |
398 | u32 olen, nlen, tlen; | |
399 | ||
400 | if (context_struct_to_string(ocontext, &o, &olen) < 0) | |
401 | goto out; | |
402 | if (context_struct_to_string(ncontext, &n, &nlen) < 0) | |
403 | goto out; | |
404 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
405 | goto out; | |
9ad9ad38 | 406 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
407 | "security_validate_transition: denied for" |
408 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", | |
409 | o, n, t, policydb.p_class_val_to_name[tclass-1]); | |
410 | out: | |
411 | kfree(o); | |
412 | kfree(n); | |
413 | kfree(t); | |
414 | ||
415 | if (!selinux_enforcing) | |
416 | return 0; | |
417 | return -EPERM; | |
418 | } | |
419 | ||
420 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
421 | u16 tclass) | |
422 | { | |
423 | struct context *ocontext; | |
424 | struct context *ncontext; | |
425 | struct context *tcontext; | |
426 | struct class_datum *tclass_datum; | |
427 | struct constraint_node *constraint; | |
428 | int rc = 0; | |
429 | ||
430 | if (!ss_initialized) | |
431 | return 0; | |
432 | ||
433 | POLICY_RDLOCK; | |
434 | ||
435 | /* | |
436 | * Remap extended Netlink classes for old policy versions. | |
437 | * Do this here rather than socket_type_to_security_class() | |
438 | * in case a newer policy version is loaded, allowing sockets | |
439 | * to remain in the correct class. | |
440 | */ | |
441 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
442 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
443 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
444 | tclass = SECCLASS_NETLINK_SOCKET; | |
445 | ||
446 | if (!tclass || tclass > policydb.p_classes.nprim) { | |
447 | printk(KERN_ERR "security_validate_transition: " | |
448 | "unrecognized class %d\n", tclass); | |
449 | rc = -EINVAL; | |
450 | goto out; | |
451 | } | |
452 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
453 | ||
454 | ocontext = sidtab_search(&sidtab, oldsid); | |
455 | if (!ocontext) { | |
456 | printk(KERN_ERR "security_validate_transition: " | |
457 | " unrecognized SID %d\n", oldsid); | |
458 | rc = -EINVAL; | |
459 | goto out; | |
460 | } | |
461 | ||
462 | ncontext = sidtab_search(&sidtab, newsid); | |
463 | if (!ncontext) { | |
464 | printk(KERN_ERR "security_validate_transition: " | |
465 | " unrecognized SID %d\n", newsid); | |
466 | rc = -EINVAL; | |
467 | goto out; | |
468 | } | |
469 | ||
470 | tcontext = sidtab_search(&sidtab, tasksid); | |
471 | if (!tcontext) { | |
472 | printk(KERN_ERR "security_validate_transition: " | |
473 | " unrecognized SID %d\n", tasksid); | |
474 | rc = -EINVAL; | |
475 | goto out; | |
476 | } | |
477 | ||
478 | constraint = tclass_datum->validatetrans; | |
479 | while (constraint) { | |
480 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
481 | constraint->expr)) { | |
482 | rc = security_validtrans_handle_fail(ocontext, ncontext, | |
483 | tcontext, tclass); | |
484 | goto out; | |
485 | } | |
486 | constraint = constraint->next; | |
487 | } | |
488 | ||
489 | out: | |
490 | POLICY_RDUNLOCK; | |
491 | return rc; | |
492 | } | |
493 | ||
494 | /** | |
495 | * security_compute_av - Compute access vector decisions. | |
496 | * @ssid: source security identifier | |
497 | * @tsid: target security identifier | |
498 | * @tclass: target security class | |
499 | * @requested: requested permissions | |
500 | * @avd: access vector decisions | |
501 | * | |
502 | * Compute a set of access vector decisions based on the | |
503 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
504 | * Return -%EINVAL if any of the parameters are invalid or %0 | |
505 | * if the access vector decisions were computed successfully. | |
506 | */ | |
507 | int security_compute_av(u32 ssid, | |
508 | u32 tsid, | |
509 | u16 tclass, | |
510 | u32 requested, | |
511 | struct av_decision *avd) | |
512 | { | |
513 | struct context *scontext = NULL, *tcontext = NULL; | |
514 | int rc = 0; | |
515 | ||
516 | if (!ss_initialized) { | |
4c443d1b SS |
517 | avd->allowed = 0xffffffff; |
518 | avd->decided = 0xffffffff; | |
1da177e4 LT |
519 | avd->auditallow = 0; |
520 | avd->auditdeny = 0xffffffff; | |
521 | avd->seqno = latest_granting; | |
522 | return 0; | |
523 | } | |
524 | ||
525 | POLICY_RDLOCK; | |
526 | ||
527 | scontext = sidtab_search(&sidtab, ssid); | |
528 | if (!scontext) { | |
529 | printk(KERN_ERR "security_compute_av: unrecognized SID %d\n", | |
530 | ssid); | |
531 | rc = -EINVAL; | |
532 | goto out; | |
533 | } | |
534 | tcontext = sidtab_search(&sidtab, tsid); | |
535 | if (!tcontext) { | |
536 | printk(KERN_ERR "security_compute_av: unrecognized SID %d\n", | |
537 | tsid); | |
538 | rc = -EINVAL; | |
539 | goto out; | |
540 | } | |
541 | ||
542 | rc = context_struct_compute_av(scontext, tcontext, tclass, | |
543 | requested, avd); | |
544 | out: | |
545 | POLICY_RDUNLOCK; | |
546 | return rc; | |
547 | } | |
548 | ||
549 | /* | |
550 | * Write the security context string representation of | |
551 | * the context structure `context' into a dynamically | |
552 | * allocated string of the correct size. Set `*scontext' | |
553 | * to point to this string and set `*scontext_len' to | |
554 | * the length of the string. | |
555 | */ | |
556 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
557 | { | |
558 | char *scontextp; | |
559 | ||
560 | *scontext = NULL; | |
561 | *scontext_len = 0; | |
562 | ||
563 | /* Compute the size of the context. */ | |
564 | *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; | |
565 | *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; | |
566 | *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; | |
567 | *scontext_len += mls_compute_context_len(context); | |
568 | ||
569 | /* Allocate space for the context; caller must free this space. */ | |
570 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
571 | if (!scontextp) { | |
572 | return -ENOMEM; | |
573 | } | |
574 | *scontext = scontextp; | |
575 | ||
576 | /* | |
577 | * Copy the user name, role name and type name into the context. | |
578 | */ | |
579 | sprintf(scontextp, "%s:%s:%s", | |
580 | policydb.p_user_val_to_name[context->user - 1], | |
581 | policydb.p_role_val_to_name[context->role - 1], | |
582 | policydb.p_type_val_to_name[context->type - 1]); | |
583 | scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + | |
584 | 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + | |
585 | 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); | |
586 | ||
587 | mls_sid_to_context(context, &scontextp); | |
588 | ||
589 | *scontextp = 0; | |
590 | ||
591 | return 0; | |
592 | } | |
593 | ||
594 | #include "initial_sid_to_string.h" | |
595 | ||
596 | /** | |
597 | * security_sid_to_context - Obtain a context for a given SID. | |
598 | * @sid: security identifier, SID | |
599 | * @scontext: security context | |
600 | * @scontext_len: length in bytes | |
601 | * | |
602 | * Write the string representation of the context associated with @sid | |
603 | * into a dynamically allocated string of the correct size. Set @scontext | |
604 | * to point to this string and set @scontext_len to the length of the string. | |
605 | */ | |
606 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
607 | { | |
608 | struct context *context; | |
609 | int rc = 0; | |
610 | ||
4f4acf3a SS |
611 | *scontext = NULL; |
612 | *scontext_len = 0; | |
613 | ||
1da177e4 LT |
614 | if (!ss_initialized) { |
615 | if (sid <= SECINITSID_NUM) { | |
616 | char *scontextp; | |
617 | ||
618 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
619 | scontextp = kmalloc(*scontext_len,GFP_ATOMIC); | |
0cccca06 SH |
620 | if (!scontextp) { |
621 | rc = -ENOMEM; | |
622 | goto out; | |
623 | } | |
1da177e4 LT |
624 | strcpy(scontextp, initial_sid_to_string[sid]); |
625 | *scontext = scontextp; | |
626 | goto out; | |
627 | } | |
628 | printk(KERN_ERR "security_sid_to_context: called before initial " | |
629 | "load_policy on unknown SID %d\n", sid); | |
630 | rc = -EINVAL; | |
631 | goto out; | |
632 | } | |
633 | POLICY_RDLOCK; | |
634 | context = sidtab_search(&sidtab, sid); | |
635 | if (!context) { | |
636 | printk(KERN_ERR "security_sid_to_context: unrecognized SID " | |
637 | "%d\n", sid); | |
638 | rc = -EINVAL; | |
639 | goto out_unlock; | |
640 | } | |
641 | rc = context_struct_to_string(context, scontext, scontext_len); | |
642 | out_unlock: | |
643 | POLICY_RDUNLOCK; | |
644 | out: | |
645 | return rc; | |
646 | ||
647 | } | |
648 | ||
f5c1d5b2 | 649 | static int security_context_to_sid_core(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid) |
1da177e4 LT |
650 | { |
651 | char *scontext2; | |
652 | struct context context; | |
653 | struct role_datum *role; | |
654 | struct type_datum *typdatum; | |
655 | struct user_datum *usrdatum; | |
656 | char *scontextp, *p, oldc; | |
657 | int rc = 0; | |
658 | ||
659 | if (!ss_initialized) { | |
660 | int i; | |
661 | ||
662 | for (i = 1; i < SECINITSID_NUM; i++) { | |
663 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
664 | *sid = i; | |
665 | goto out; | |
666 | } | |
667 | } | |
668 | *sid = SECINITSID_KERNEL; | |
669 | goto out; | |
670 | } | |
671 | *sid = SECSID_NULL; | |
672 | ||
673 | /* Copy the string so that we can modify the copy as we parse it. | |
674 | The string should already by null terminated, but we append a | |
675 | null suffix to the copy to avoid problems with the existing | |
676 | attr package, which doesn't view the null terminator as part | |
677 | of the attribute value. */ | |
678 | scontext2 = kmalloc(scontext_len+1,GFP_KERNEL); | |
679 | if (!scontext2) { | |
680 | rc = -ENOMEM; | |
681 | goto out; | |
682 | } | |
683 | memcpy(scontext2, scontext, scontext_len); | |
684 | scontext2[scontext_len] = 0; | |
685 | ||
686 | context_init(&context); | |
687 | *sid = SECSID_NULL; | |
688 | ||
689 | POLICY_RDLOCK; | |
690 | ||
691 | /* Parse the security context. */ | |
692 | ||
693 | rc = -EINVAL; | |
694 | scontextp = (char *) scontext2; | |
695 | ||
696 | /* Extract the user. */ | |
697 | p = scontextp; | |
698 | while (*p && *p != ':') | |
699 | p++; | |
700 | ||
701 | if (*p == 0) | |
702 | goto out_unlock; | |
703 | ||
704 | *p++ = 0; | |
705 | ||
706 | usrdatum = hashtab_search(policydb.p_users.table, scontextp); | |
707 | if (!usrdatum) | |
708 | goto out_unlock; | |
709 | ||
710 | context.user = usrdatum->value; | |
711 | ||
712 | /* Extract role. */ | |
713 | scontextp = p; | |
714 | while (*p && *p != ':') | |
715 | p++; | |
716 | ||
717 | if (*p == 0) | |
718 | goto out_unlock; | |
719 | ||
720 | *p++ = 0; | |
721 | ||
722 | role = hashtab_search(policydb.p_roles.table, scontextp); | |
723 | if (!role) | |
724 | goto out_unlock; | |
725 | context.role = role->value; | |
726 | ||
727 | /* Extract type. */ | |
728 | scontextp = p; | |
729 | while (*p && *p != ':') | |
730 | p++; | |
731 | oldc = *p; | |
732 | *p++ = 0; | |
733 | ||
734 | typdatum = hashtab_search(policydb.p_types.table, scontextp); | |
735 | if (!typdatum) | |
736 | goto out_unlock; | |
737 | ||
738 | context.type = typdatum->value; | |
739 | ||
f5c1d5b2 | 740 | rc = mls_context_to_sid(oldc, &p, &context, &sidtab, def_sid); |
1da177e4 LT |
741 | if (rc) |
742 | goto out_unlock; | |
743 | ||
744 | if ((p - scontext2) < scontext_len) { | |
745 | rc = -EINVAL; | |
746 | goto out_unlock; | |
747 | } | |
748 | ||
749 | /* Check the validity of the new context. */ | |
750 | if (!policydb_context_isvalid(&policydb, &context)) { | |
751 | rc = -EINVAL; | |
752 | goto out_unlock; | |
753 | } | |
754 | /* Obtain the new sid. */ | |
755 | rc = sidtab_context_to_sid(&sidtab, &context, sid); | |
756 | out_unlock: | |
757 | POLICY_RDUNLOCK; | |
758 | context_destroy(&context); | |
759 | kfree(scontext2); | |
760 | out: | |
761 | return rc; | |
762 | } | |
763 | ||
f5c1d5b2 JM |
764 | /** |
765 | * security_context_to_sid - Obtain a SID for a given security context. | |
766 | * @scontext: security context | |
767 | * @scontext_len: length in bytes | |
768 | * @sid: security identifier, SID | |
769 | * | |
770 | * Obtains a SID associated with the security context that | |
771 | * has the string representation specified by @scontext. | |
772 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
773 | * memory is available, or 0 on success. | |
774 | */ | |
775 | int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid) | |
776 | { | |
777 | return security_context_to_sid_core(scontext, scontext_len, | |
778 | sid, SECSID_NULL); | |
779 | } | |
780 | ||
781 | /** | |
782 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
783 | * falling back to specified default if needed. | |
784 | * | |
785 | * @scontext: security context | |
786 | * @scontext_len: length in bytes | |
787 | * @sid: security identifier, SID | |
788 | * @def_sid: default SID to assign on errror | |
789 | * | |
790 | * Obtains a SID associated with the security context that | |
791 | * has the string representation specified by @scontext. | |
792 | * The default SID is passed to the MLS layer to be used to allow | |
793 | * kernel labeling of the MLS field if the MLS field is not present | |
794 | * (for upgrading to MLS without full relabel). | |
795 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
796 | * memory is available, or 0 on success. | |
797 | */ | |
798 | int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid) | |
799 | { | |
800 | return security_context_to_sid_core(scontext, scontext_len, | |
801 | sid, def_sid); | |
802 | } | |
803 | ||
1da177e4 LT |
804 | static int compute_sid_handle_invalid_context( |
805 | struct context *scontext, | |
806 | struct context *tcontext, | |
807 | u16 tclass, | |
808 | struct context *newcontext) | |
809 | { | |
810 | char *s = NULL, *t = NULL, *n = NULL; | |
811 | u32 slen, tlen, nlen; | |
812 | ||
813 | if (context_struct_to_string(scontext, &s, &slen) < 0) | |
814 | goto out; | |
815 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
816 | goto out; | |
817 | if (context_struct_to_string(newcontext, &n, &nlen) < 0) | |
818 | goto out; | |
9ad9ad38 | 819 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
820 | "security_compute_sid: invalid context %s" |
821 | " for scontext=%s" | |
822 | " tcontext=%s" | |
823 | " tclass=%s", | |
824 | n, s, t, policydb.p_class_val_to_name[tclass-1]); | |
825 | out: | |
826 | kfree(s); | |
827 | kfree(t); | |
828 | kfree(n); | |
829 | if (!selinux_enforcing) | |
830 | return 0; | |
831 | return -EACCES; | |
832 | } | |
833 | ||
834 | static int security_compute_sid(u32 ssid, | |
835 | u32 tsid, | |
836 | u16 tclass, | |
837 | u32 specified, | |
838 | u32 *out_sid) | |
839 | { | |
840 | struct context *scontext = NULL, *tcontext = NULL, newcontext; | |
841 | struct role_trans *roletr = NULL; | |
842 | struct avtab_key avkey; | |
843 | struct avtab_datum *avdatum; | |
844 | struct avtab_node *node; | |
1da177e4 LT |
845 | int rc = 0; |
846 | ||
847 | if (!ss_initialized) { | |
848 | switch (tclass) { | |
849 | case SECCLASS_PROCESS: | |
850 | *out_sid = ssid; | |
851 | break; | |
852 | default: | |
853 | *out_sid = tsid; | |
854 | break; | |
855 | } | |
856 | goto out; | |
857 | } | |
858 | ||
851f8a69 VY |
859 | context_init(&newcontext); |
860 | ||
1da177e4 LT |
861 | POLICY_RDLOCK; |
862 | ||
863 | scontext = sidtab_search(&sidtab, ssid); | |
864 | if (!scontext) { | |
865 | printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n", | |
866 | ssid); | |
867 | rc = -EINVAL; | |
868 | goto out_unlock; | |
869 | } | |
870 | tcontext = sidtab_search(&sidtab, tsid); | |
871 | if (!tcontext) { | |
872 | printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n", | |
873 | tsid); | |
874 | rc = -EINVAL; | |
875 | goto out_unlock; | |
876 | } | |
877 | ||
1da177e4 LT |
878 | /* Set the user identity. */ |
879 | switch (specified) { | |
880 | case AVTAB_TRANSITION: | |
881 | case AVTAB_CHANGE: | |
882 | /* Use the process user identity. */ | |
883 | newcontext.user = scontext->user; | |
884 | break; | |
885 | case AVTAB_MEMBER: | |
886 | /* Use the related object owner. */ | |
887 | newcontext.user = tcontext->user; | |
888 | break; | |
889 | } | |
890 | ||
891 | /* Set the role and type to default values. */ | |
892 | switch (tclass) { | |
893 | case SECCLASS_PROCESS: | |
894 | /* Use the current role and type of process. */ | |
895 | newcontext.role = scontext->role; | |
896 | newcontext.type = scontext->type; | |
897 | break; | |
898 | default: | |
899 | /* Use the well-defined object role. */ | |
900 | newcontext.role = OBJECT_R_VAL; | |
901 | /* Use the type of the related object. */ | |
902 | newcontext.type = tcontext->type; | |
903 | } | |
904 | ||
905 | /* Look for a type transition/member/change rule. */ | |
906 | avkey.source_type = scontext->type; | |
907 | avkey.target_type = tcontext->type; | |
908 | avkey.target_class = tclass; | |
782ebb99 SS |
909 | avkey.specified = specified; |
910 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
911 | |
912 | /* If no permanent rule, also check for enabled conditional rules */ | |
913 | if(!avdatum) { | |
782ebb99 | 914 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
1da177e4 | 915 | for (; node != NULL; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 916 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
917 | avdatum = &node->datum; |
918 | break; | |
919 | } | |
920 | } | |
921 | } | |
922 | ||
782ebb99 | 923 | if (avdatum) { |
1da177e4 | 924 | /* Use the type from the type transition/member/change rule. */ |
782ebb99 | 925 | newcontext.type = avdatum->data; |
1da177e4 LT |
926 | } |
927 | ||
928 | /* Check for class-specific changes. */ | |
929 | switch (tclass) { | |
930 | case SECCLASS_PROCESS: | |
931 | if (specified & AVTAB_TRANSITION) { | |
932 | /* Look for a role transition rule. */ | |
933 | for (roletr = policydb.role_tr; roletr; | |
934 | roletr = roletr->next) { | |
935 | if (roletr->role == scontext->role && | |
936 | roletr->type == tcontext->type) { | |
937 | /* Use the role transition rule. */ | |
938 | newcontext.role = roletr->new_role; | |
939 | break; | |
940 | } | |
941 | } | |
942 | } | |
943 | break; | |
944 | default: | |
945 | break; | |
946 | } | |
947 | ||
948 | /* Set the MLS attributes. | |
949 | This is done last because it may allocate memory. */ | |
950 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext); | |
951 | if (rc) | |
952 | goto out_unlock; | |
953 | ||
954 | /* Check the validity of the context. */ | |
955 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
956 | rc = compute_sid_handle_invalid_context(scontext, | |
957 | tcontext, | |
958 | tclass, | |
959 | &newcontext); | |
960 | if (rc) | |
961 | goto out_unlock; | |
962 | } | |
963 | /* Obtain the sid for the context. */ | |
964 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
965 | out_unlock: | |
966 | POLICY_RDUNLOCK; | |
967 | context_destroy(&newcontext); | |
968 | out: | |
969 | return rc; | |
970 | } | |
971 | ||
972 | /** | |
973 | * security_transition_sid - Compute the SID for a new subject/object. | |
974 | * @ssid: source security identifier | |
975 | * @tsid: target security identifier | |
976 | * @tclass: target security class | |
977 | * @out_sid: security identifier for new subject/object | |
978 | * | |
979 | * Compute a SID to use for labeling a new subject or object in the | |
980 | * class @tclass based on a SID pair (@ssid, @tsid). | |
981 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
982 | * if insufficient memory is available, or %0 if the new SID was | |
983 | * computed successfully. | |
984 | */ | |
985 | int security_transition_sid(u32 ssid, | |
986 | u32 tsid, | |
987 | u16 tclass, | |
988 | u32 *out_sid) | |
989 | { | |
990 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid); | |
991 | } | |
992 | ||
993 | /** | |
994 | * security_member_sid - Compute the SID for member selection. | |
995 | * @ssid: source security identifier | |
996 | * @tsid: target security identifier | |
997 | * @tclass: target security class | |
998 | * @out_sid: security identifier for selected member | |
999 | * | |
1000 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1001 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1002 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1003 | * if insufficient memory is available, or %0 if the SID was | |
1004 | * computed successfully. | |
1005 | */ | |
1006 | int security_member_sid(u32 ssid, | |
1007 | u32 tsid, | |
1008 | u16 tclass, | |
1009 | u32 *out_sid) | |
1010 | { | |
1011 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid); | |
1012 | } | |
1013 | ||
1014 | /** | |
1015 | * security_change_sid - Compute the SID for object relabeling. | |
1016 | * @ssid: source security identifier | |
1017 | * @tsid: target security identifier | |
1018 | * @tclass: target security class | |
1019 | * @out_sid: security identifier for selected member | |
1020 | * | |
1021 | * Compute a SID to use for relabeling an object of class @tclass | |
1022 | * based on a SID pair (@ssid, @tsid). | |
1023 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1024 | * if insufficient memory is available, or %0 if the SID was | |
1025 | * computed successfully. | |
1026 | */ | |
1027 | int security_change_sid(u32 ssid, | |
1028 | u32 tsid, | |
1029 | u16 tclass, | |
1030 | u32 *out_sid) | |
1031 | { | |
1032 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid); | |
1033 | } | |
1034 | ||
b94c7e67 CS |
1035 | /* |
1036 | * Verify that each kernel class that is defined in the | |
1037 | * policy is correct | |
1038 | */ | |
1039 | static int validate_classes(struct policydb *p) | |
1040 | { | |
1041 | int i, j; | |
1042 | struct class_datum *cladatum; | |
1043 | struct perm_datum *perdatum; | |
1044 | u32 nprim, tmp, common_pts_len, perm_val, pol_val; | |
1045 | u16 class_val; | |
1046 | const struct selinux_class_perm *kdefs = &selinux_class_perm; | |
1047 | const char *def_class, *def_perm, *pol_class; | |
1048 | struct symtab *perms; | |
1049 | ||
1050 | for (i = 1; i < kdefs->cts_len; i++) { | |
1051 | def_class = kdefs->class_to_string[i]; | |
1052 | if (i > p->p_classes.nprim) { | |
1053 | printk(KERN_INFO | |
1054 | "security: class %s not defined in policy\n", | |
1055 | def_class); | |
1056 | continue; | |
1057 | } | |
1058 | pol_class = p->p_class_val_to_name[i-1]; | |
1059 | if (strcmp(pol_class, def_class)) { | |
1060 | printk(KERN_ERR | |
1061 | "security: class %d is incorrect, found %s but should be %s\n", | |
1062 | i, pol_class, def_class); | |
1063 | return -EINVAL; | |
1064 | } | |
1065 | } | |
1066 | for (i = 0; i < kdefs->av_pts_len; i++) { | |
1067 | class_val = kdefs->av_perm_to_string[i].tclass; | |
1068 | perm_val = kdefs->av_perm_to_string[i].value; | |
1069 | def_perm = kdefs->av_perm_to_string[i].name; | |
1070 | if (class_val > p->p_classes.nprim) | |
1071 | continue; | |
1072 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1073 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1074 | BUG_ON(!cladatum); | |
1075 | perms = &cladatum->permissions; | |
1076 | nprim = 1 << (perms->nprim - 1); | |
1077 | if (perm_val > nprim) { | |
1078 | printk(KERN_INFO | |
1079 | "security: permission %s in class %s not defined in policy\n", | |
1080 | def_perm, pol_class); | |
1081 | continue; | |
1082 | } | |
1083 | perdatum = hashtab_search(perms->table, def_perm); | |
1084 | if (perdatum == NULL) { | |
1085 | printk(KERN_ERR | |
1086 | "security: permission %s in class %s not found in policy\n", | |
1087 | def_perm, pol_class); | |
1088 | return -EINVAL; | |
1089 | } | |
1090 | pol_val = 1 << (perdatum->value - 1); | |
1091 | if (pol_val != perm_val) { | |
1092 | printk(KERN_ERR | |
1093 | "security: permission %s in class %s has incorrect value\n", | |
1094 | def_perm, pol_class); | |
1095 | return -EINVAL; | |
1096 | } | |
1097 | } | |
1098 | for (i = 0; i < kdefs->av_inherit_len; i++) { | |
1099 | class_val = kdefs->av_inherit[i].tclass; | |
1100 | if (class_val > p->p_classes.nprim) | |
1101 | continue; | |
1102 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1103 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1104 | BUG_ON(!cladatum); | |
1105 | if (!cladatum->comdatum) { | |
1106 | printk(KERN_ERR | |
1107 | "security: class %s should have an inherits clause but does not\n", | |
1108 | pol_class); | |
1109 | return -EINVAL; | |
1110 | } | |
1111 | tmp = kdefs->av_inherit[i].common_base; | |
1112 | common_pts_len = 0; | |
1113 | while (!(tmp & 0x01)) { | |
1114 | common_pts_len++; | |
1115 | tmp >>= 1; | |
1116 | } | |
1117 | perms = &cladatum->comdatum->permissions; | |
1118 | for (j = 0; j < common_pts_len; j++) { | |
1119 | def_perm = kdefs->av_inherit[i].common_pts[j]; | |
1120 | if (j >= perms->nprim) { | |
1121 | printk(KERN_INFO | |
1122 | "security: permission %s in class %s not defined in policy\n", | |
1123 | def_perm, pol_class); | |
1124 | continue; | |
1125 | } | |
1126 | perdatum = hashtab_search(perms->table, def_perm); | |
1127 | if (perdatum == NULL) { | |
1128 | printk(KERN_ERR | |
1129 | "security: permission %s in class %s not found in policy\n", | |
1130 | def_perm, pol_class); | |
1131 | return -EINVAL; | |
1132 | } | |
1133 | if (perdatum->value != j + 1) { | |
1134 | printk(KERN_ERR | |
1135 | "security: permission %s in class %s has incorrect value\n", | |
1136 | def_perm, pol_class); | |
1137 | return -EINVAL; | |
1138 | } | |
1139 | } | |
1140 | } | |
1141 | return 0; | |
1142 | } | |
1143 | ||
1da177e4 LT |
1144 | /* Clone the SID into the new SID table. */ |
1145 | static int clone_sid(u32 sid, | |
1146 | struct context *context, | |
1147 | void *arg) | |
1148 | { | |
1149 | struct sidtab *s = arg; | |
1150 | ||
1151 | return sidtab_insert(s, sid, context); | |
1152 | } | |
1153 | ||
1154 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1155 | { | |
1156 | int rc = 0; | |
1157 | ||
1158 | if (selinux_enforcing) { | |
1159 | rc = -EINVAL; | |
1160 | } else { | |
1161 | char *s; | |
1162 | u32 len; | |
1163 | ||
1164 | context_struct_to_string(context, &s, &len); | |
1165 | printk(KERN_ERR "security: context %s is invalid\n", s); | |
1166 | kfree(s); | |
1167 | } | |
1168 | return rc; | |
1169 | } | |
1170 | ||
1171 | struct convert_context_args { | |
1172 | struct policydb *oldp; | |
1173 | struct policydb *newp; | |
1174 | }; | |
1175 | ||
1176 | /* | |
1177 | * Convert the values in the security context | |
1178 | * structure `c' from the values specified | |
1179 | * in the policy `p->oldp' to the values specified | |
1180 | * in the policy `p->newp'. Verify that the | |
1181 | * context is valid under the new policy. | |
1182 | */ | |
1183 | static int convert_context(u32 key, | |
1184 | struct context *c, | |
1185 | void *p) | |
1186 | { | |
1187 | struct convert_context_args *args; | |
1188 | struct context oldc; | |
1189 | struct role_datum *role; | |
1190 | struct type_datum *typdatum; | |
1191 | struct user_datum *usrdatum; | |
1192 | char *s; | |
1193 | u32 len; | |
1194 | int rc; | |
1195 | ||
1196 | args = p; | |
1197 | ||
1198 | rc = context_cpy(&oldc, c); | |
1199 | if (rc) | |
1200 | goto out; | |
1201 | ||
1202 | rc = -EINVAL; | |
1203 | ||
1204 | /* Convert the user. */ | |
1205 | usrdatum = hashtab_search(args->newp->p_users.table, | |
1206 | args->oldp->p_user_val_to_name[c->user - 1]); | |
1207 | if (!usrdatum) { | |
1208 | goto bad; | |
1209 | } | |
1210 | c->user = usrdatum->value; | |
1211 | ||
1212 | /* Convert the role. */ | |
1213 | role = hashtab_search(args->newp->p_roles.table, | |
1214 | args->oldp->p_role_val_to_name[c->role - 1]); | |
1215 | if (!role) { | |
1216 | goto bad; | |
1217 | } | |
1218 | c->role = role->value; | |
1219 | ||
1220 | /* Convert the type. */ | |
1221 | typdatum = hashtab_search(args->newp->p_types.table, | |
1222 | args->oldp->p_type_val_to_name[c->type - 1]); | |
1223 | if (!typdatum) { | |
1224 | goto bad; | |
1225 | } | |
1226 | c->type = typdatum->value; | |
1227 | ||
1228 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1229 | if (rc) | |
1230 | goto bad; | |
1231 | ||
1232 | /* Check the validity of the new context. */ | |
1233 | if (!policydb_context_isvalid(args->newp, c)) { | |
1234 | rc = convert_context_handle_invalid_context(&oldc); | |
1235 | if (rc) | |
1236 | goto bad; | |
1237 | } | |
1238 | ||
1239 | context_destroy(&oldc); | |
1240 | out: | |
1241 | return rc; | |
1242 | bad: | |
1243 | context_struct_to_string(&oldc, &s, &len); | |
1244 | context_destroy(&oldc); | |
1245 | printk(KERN_ERR "security: invalidating context %s\n", s); | |
1246 | kfree(s); | |
1247 | goto out; | |
1248 | } | |
1249 | ||
1250 | extern void selinux_complete_init(void); | |
1251 | ||
1252 | /** | |
1253 | * security_load_policy - Load a security policy configuration. | |
1254 | * @data: binary policy data | |
1255 | * @len: length of data in bytes | |
1256 | * | |
1257 | * Load a new set of security policy configuration data, | |
1258 | * validate it and convert the SID table as necessary. | |
1259 | * This function will flush the access vector cache after | |
1260 | * loading the new policy. | |
1261 | */ | |
1262 | int security_load_policy(void *data, size_t len) | |
1263 | { | |
1264 | struct policydb oldpolicydb, newpolicydb; | |
1265 | struct sidtab oldsidtab, newsidtab; | |
1266 | struct convert_context_args args; | |
1267 | u32 seqno; | |
1268 | int rc = 0; | |
1269 | struct policy_file file = { data, len }, *fp = &file; | |
1270 | ||
1271 | LOAD_LOCK; | |
1272 | ||
1273 | if (!ss_initialized) { | |
1274 | avtab_cache_init(); | |
1275 | if (policydb_read(&policydb, fp)) { | |
1276 | LOAD_UNLOCK; | |
1277 | avtab_cache_destroy(); | |
1278 | return -EINVAL; | |
1279 | } | |
1280 | if (policydb_load_isids(&policydb, &sidtab)) { | |
1281 | LOAD_UNLOCK; | |
1282 | policydb_destroy(&policydb); | |
1283 | avtab_cache_destroy(); | |
1284 | return -EINVAL; | |
1285 | } | |
b94c7e67 CS |
1286 | /* Verify that the kernel defined classes are correct. */ |
1287 | if (validate_classes(&policydb)) { | |
1288 | printk(KERN_ERR | |
1289 | "security: the definition of a class is incorrect\n"); | |
1290 | LOAD_UNLOCK; | |
1291 | sidtab_destroy(&sidtab); | |
1292 | policydb_destroy(&policydb); | |
1293 | avtab_cache_destroy(); | |
1294 | return -EINVAL; | |
1295 | } | |
1da177e4 LT |
1296 | policydb_loaded_version = policydb.policyvers; |
1297 | ss_initialized = 1; | |
4c443d1b | 1298 | seqno = ++latest_granting; |
1da177e4 LT |
1299 | LOAD_UNLOCK; |
1300 | selinux_complete_init(); | |
4c443d1b SS |
1301 | avc_ss_reset(seqno); |
1302 | selnl_notify_policyload(seqno); | |
7420ed23 | 1303 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1304 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1305 | return 0; |
1306 | } | |
1307 | ||
1308 | #if 0 | |
1309 | sidtab_hash_eval(&sidtab, "sids"); | |
1310 | #endif | |
1311 | ||
1312 | if (policydb_read(&newpolicydb, fp)) { | |
1313 | LOAD_UNLOCK; | |
1314 | return -EINVAL; | |
1315 | } | |
1316 | ||
1317 | sidtab_init(&newsidtab); | |
1318 | ||
b94c7e67 CS |
1319 | /* Verify that the kernel defined classes are correct. */ |
1320 | if (validate_classes(&newpolicydb)) { | |
1321 | printk(KERN_ERR | |
1322 | "security: the definition of a class is incorrect\n"); | |
1323 | rc = -EINVAL; | |
1324 | goto err; | |
1325 | } | |
1326 | ||
1da177e4 LT |
1327 | /* Clone the SID table. */ |
1328 | sidtab_shutdown(&sidtab); | |
1329 | if (sidtab_map(&sidtab, clone_sid, &newsidtab)) { | |
1330 | rc = -ENOMEM; | |
1331 | goto err; | |
1332 | } | |
1333 | ||
1334 | /* Convert the internal representations of contexts | |
1335 | in the new SID table and remove invalid SIDs. */ | |
1336 | args.oldp = &policydb; | |
1337 | args.newp = &newpolicydb; | |
1338 | sidtab_map_remove_on_error(&newsidtab, convert_context, &args); | |
1339 | ||
1340 | /* Save the old policydb and SID table to free later. */ | |
1341 | memcpy(&oldpolicydb, &policydb, sizeof policydb); | |
1342 | sidtab_set(&oldsidtab, &sidtab); | |
1343 | ||
1344 | /* Install the new policydb and SID table. */ | |
1345 | POLICY_WRLOCK; | |
1346 | memcpy(&policydb, &newpolicydb, sizeof policydb); | |
1347 | sidtab_set(&sidtab, &newsidtab); | |
1348 | seqno = ++latest_granting; | |
1349 | policydb_loaded_version = policydb.policyvers; | |
1350 | POLICY_WRUNLOCK; | |
1351 | LOAD_UNLOCK; | |
1352 | ||
1353 | /* Free the old policydb and SID table. */ | |
1354 | policydb_destroy(&oldpolicydb); | |
1355 | sidtab_destroy(&oldsidtab); | |
1356 | ||
1357 | avc_ss_reset(seqno); | |
1358 | selnl_notify_policyload(seqno); | |
7420ed23 | 1359 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1360 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1361 | |
1362 | return 0; | |
1363 | ||
1364 | err: | |
1365 | LOAD_UNLOCK; | |
1366 | sidtab_destroy(&newsidtab); | |
1367 | policydb_destroy(&newpolicydb); | |
1368 | return rc; | |
1369 | ||
1370 | } | |
1371 | ||
1372 | /** | |
1373 | * security_port_sid - Obtain the SID for a port. | |
1374 | * @domain: communication domain aka address family | |
1375 | * @type: socket type | |
1376 | * @protocol: protocol number | |
1377 | * @port: port number | |
1378 | * @out_sid: security identifier | |
1379 | */ | |
1380 | int security_port_sid(u16 domain, | |
1381 | u16 type, | |
1382 | u8 protocol, | |
1383 | u16 port, | |
1384 | u32 *out_sid) | |
1385 | { | |
1386 | struct ocontext *c; | |
1387 | int rc = 0; | |
1388 | ||
1389 | POLICY_RDLOCK; | |
1390 | ||
1391 | c = policydb.ocontexts[OCON_PORT]; | |
1392 | while (c) { | |
1393 | if (c->u.port.protocol == protocol && | |
1394 | c->u.port.low_port <= port && | |
1395 | c->u.port.high_port >= port) | |
1396 | break; | |
1397 | c = c->next; | |
1398 | } | |
1399 | ||
1400 | if (c) { | |
1401 | if (!c->sid[0]) { | |
1402 | rc = sidtab_context_to_sid(&sidtab, | |
1403 | &c->context[0], | |
1404 | &c->sid[0]); | |
1405 | if (rc) | |
1406 | goto out; | |
1407 | } | |
1408 | *out_sid = c->sid[0]; | |
1409 | } else { | |
1410 | *out_sid = SECINITSID_PORT; | |
1411 | } | |
1412 | ||
1413 | out: | |
1414 | POLICY_RDUNLOCK; | |
1415 | return rc; | |
1416 | } | |
1417 | ||
1418 | /** | |
1419 | * security_netif_sid - Obtain the SID for a network interface. | |
1420 | * @name: interface name | |
1421 | * @if_sid: interface SID | |
1422 | * @msg_sid: default SID for received packets | |
1423 | */ | |
1424 | int security_netif_sid(char *name, | |
1425 | u32 *if_sid, | |
1426 | u32 *msg_sid) | |
1427 | { | |
1428 | int rc = 0; | |
1429 | struct ocontext *c; | |
1430 | ||
1431 | POLICY_RDLOCK; | |
1432 | ||
1433 | c = policydb.ocontexts[OCON_NETIF]; | |
1434 | while (c) { | |
1435 | if (strcmp(name, c->u.name) == 0) | |
1436 | break; | |
1437 | c = c->next; | |
1438 | } | |
1439 | ||
1440 | if (c) { | |
1441 | if (!c->sid[0] || !c->sid[1]) { | |
1442 | rc = sidtab_context_to_sid(&sidtab, | |
1443 | &c->context[0], | |
1444 | &c->sid[0]); | |
1445 | if (rc) | |
1446 | goto out; | |
1447 | rc = sidtab_context_to_sid(&sidtab, | |
1448 | &c->context[1], | |
1449 | &c->sid[1]); | |
1450 | if (rc) | |
1451 | goto out; | |
1452 | } | |
1453 | *if_sid = c->sid[0]; | |
1454 | *msg_sid = c->sid[1]; | |
1455 | } else { | |
1456 | *if_sid = SECINITSID_NETIF; | |
1457 | *msg_sid = SECINITSID_NETMSG; | |
1458 | } | |
1459 | ||
1460 | out: | |
1461 | POLICY_RDUNLOCK; | |
1462 | return rc; | |
1463 | } | |
1464 | ||
1465 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
1466 | { | |
1467 | int i, fail = 0; | |
1468 | ||
1469 | for(i = 0; i < 4; i++) | |
1470 | if(addr[i] != (input[i] & mask[i])) { | |
1471 | fail = 1; | |
1472 | break; | |
1473 | } | |
1474 | ||
1475 | return !fail; | |
1476 | } | |
1477 | ||
1478 | /** | |
1479 | * security_node_sid - Obtain the SID for a node (host). | |
1480 | * @domain: communication domain aka address family | |
1481 | * @addrp: address | |
1482 | * @addrlen: address length in bytes | |
1483 | * @out_sid: security identifier | |
1484 | */ | |
1485 | int security_node_sid(u16 domain, | |
1486 | void *addrp, | |
1487 | u32 addrlen, | |
1488 | u32 *out_sid) | |
1489 | { | |
1490 | int rc = 0; | |
1491 | struct ocontext *c; | |
1492 | ||
1493 | POLICY_RDLOCK; | |
1494 | ||
1495 | switch (domain) { | |
1496 | case AF_INET: { | |
1497 | u32 addr; | |
1498 | ||
1499 | if (addrlen != sizeof(u32)) { | |
1500 | rc = -EINVAL; | |
1501 | goto out; | |
1502 | } | |
1503 | ||
1504 | addr = *((u32 *)addrp); | |
1505 | ||
1506 | c = policydb.ocontexts[OCON_NODE]; | |
1507 | while (c) { | |
1508 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
1509 | break; | |
1510 | c = c->next; | |
1511 | } | |
1512 | break; | |
1513 | } | |
1514 | ||
1515 | case AF_INET6: | |
1516 | if (addrlen != sizeof(u64) * 2) { | |
1517 | rc = -EINVAL; | |
1518 | goto out; | |
1519 | } | |
1520 | c = policydb.ocontexts[OCON_NODE6]; | |
1521 | while (c) { | |
1522 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
1523 | c->u.node6.mask)) | |
1524 | break; | |
1525 | c = c->next; | |
1526 | } | |
1527 | break; | |
1528 | ||
1529 | default: | |
1530 | *out_sid = SECINITSID_NODE; | |
1531 | goto out; | |
1532 | } | |
1533 | ||
1534 | if (c) { | |
1535 | if (!c->sid[0]) { | |
1536 | rc = sidtab_context_to_sid(&sidtab, | |
1537 | &c->context[0], | |
1538 | &c->sid[0]); | |
1539 | if (rc) | |
1540 | goto out; | |
1541 | } | |
1542 | *out_sid = c->sid[0]; | |
1543 | } else { | |
1544 | *out_sid = SECINITSID_NODE; | |
1545 | } | |
1546 | ||
1547 | out: | |
1548 | POLICY_RDUNLOCK; | |
1549 | return rc; | |
1550 | } | |
1551 | ||
1552 | #define SIDS_NEL 25 | |
1553 | ||
1554 | /** | |
1555 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
1556 | * @fromsid: starting SID | |
1557 | * @username: username | |
1558 | * @sids: array of reachable SIDs for user | |
1559 | * @nel: number of elements in @sids | |
1560 | * | |
1561 | * Generate the set of SIDs for legal security contexts | |
1562 | * for a given user that can be reached by @fromsid. | |
1563 | * Set *@sids to point to a dynamically allocated | |
1564 | * array containing the set of SIDs. Set *@nel to the | |
1565 | * number of elements in the array. | |
1566 | */ | |
1567 | ||
1568 | int security_get_user_sids(u32 fromsid, | |
1569 | char *username, | |
1570 | u32 **sids, | |
1571 | u32 *nel) | |
1572 | { | |
1573 | struct context *fromcon, usercon; | |
1574 | u32 *mysids, *mysids2, sid; | |
1575 | u32 mynel = 0, maxnel = SIDS_NEL; | |
1576 | struct user_datum *user; | |
1577 | struct role_datum *role; | |
1578 | struct av_decision avd; | |
782ebb99 | 1579 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
1580 | int rc = 0, i, j; |
1581 | ||
1582 | if (!ss_initialized) { | |
1583 | *sids = NULL; | |
1584 | *nel = 0; | |
1585 | goto out; | |
1586 | } | |
1587 | ||
1588 | POLICY_RDLOCK; | |
1589 | ||
1590 | fromcon = sidtab_search(&sidtab, fromsid); | |
1591 | if (!fromcon) { | |
1592 | rc = -EINVAL; | |
1593 | goto out_unlock; | |
1594 | } | |
1595 | ||
1596 | user = hashtab_search(policydb.p_users.table, username); | |
1597 | if (!user) { | |
1598 | rc = -EINVAL; | |
1599 | goto out_unlock; | |
1600 | } | |
1601 | usercon.user = user->value; | |
1602 | ||
89d155ef | 1603 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
1da177e4 LT |
1604 | if (!mysids) { |
1605 | rc = -ENOMEM; | |
1606 | goto out_unlock; | |
1607 | } | |
1da177e4 | 1608 | |
782ebb99 SS |
1609 | ebitmap_for_each_bit(&user->roles, rnode, i) { |
1610 | if (!ebitmap_node_get_bit(rnode, i)) | |
1da177e4 LT |
1611 | continue; |
1612 | role = policydb.role_val_to_struct[i]; | |
1613 | usercon.role = i+1; | |
782ebb99 SS |
1614 | ebitmap_for_each_bit(&role->types, tnode, j) { |
1615 | if (!ebitmap_node_get_bit(tnode, j)) | |
1da177e4 LT |
1616 | continue; |
1617 | usercon.type = j+1; | |
1618 | ||
1619 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
1620 | continue; | |
1621 | ||
1622 | rc = context_struct_compute_av(fromcon, &usercon, | |
1623 | SECCLASS_PROCESS, | |
1624 | PROCESS__TRANSITION, | |
1625 | &avd); | |
1626 | if (rc || !(avd.allowed & PROCESS__TRANSITION)) | |
1627 | continue; | |
1628 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); | |
1629 | if (rc) { | |
1630 | kfree(mysids); | |
1631 | goto out_unlock; | |
1632 | } | |
1633 | if (mynel < maxnel) { | |
1634 | mysids[mynel++] = sid; | |
1635 | } else { | |
1636 | maxnel += SIDS_NEL; | |
89d155ef | 1637 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
1da177e4 LT |
1638 | if (!mysids2) { |
1639 | rc = -ENOMEM; | |
1640 | kfree(mysids); | |
1641 | goto out_unlock; | |
1642 | } | |
1da177e4 LT |
1643 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
1644 | kfree(mysids); | |
1645 | mysids = mysids2; | |
1646 | mysids[mynel++] = sid; | |
1647 | } | |
1648 | } | |
1649 | } | |
1650 | ||
1651 | *sids = mysids; | |
1652 | *nel = mynel; | |
1653 | ||
1654 | out_unlock: | |
1655 | POLICY_RDUNLOCK; | |
1656 | out: | |
1657 | return rc; | |
1658 | } | |
1659 | ||
1660 | /** | |
1661 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
1662 | * @fstype: filesystem type | |
1663 | * @path: path from root of mount | |
1664 | * @sclass: file security class | |
1665 | * @sid: SID for path | |
1666 | * | |
1667 | * Obtain a SID to use for a file in a filesystem that | |
1668 | * cannot support xattr or use a fixed labeling behavior like | |
1669 | * transition SIDs or task SIDs. | |
1670 | */ | |
1671 | int security_genfs_sid(const char *fstype, | |
1672 | char *path, | |
1673 | u16 sclass, | |
1674 | u32 *sid) | |
1675 | { | |
1676 | int len; | |
1677 | struct genfs *genfs; | |
1678 | struct ocontext *c; | |
1679 | int rc = 0, cmp = 0; | |
1680 | ||
1681 | POLICY_RDLOCK; | |
1682 | ||
1683 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { | |
1684 | cmp = strcmp(fstype, genfs->fstype); | |
1685 | if (cmp <= 0) | |
1686 | break; | |
1687 | } | |
1688 | ||
1689 | if (!genfs || cmp) { | |
1690 | *sid = SECINITSID_UNLABELED; | |
1691 | rc = -ENOENT; | |
1692 | goto out; | |
1693 | } | |
1694 | ||
1695 | for (c = genfs->head; c; c = c->next) { | |
1696 | len = strlen(c->u.name); | |
1697 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
1698 | (strncmp(c->u.name, path, len) == 0)) | |
1699 | break; | |
1700 | } | |
1701 | ||
1702 | if (!c) { | |
1703 | *sid = SECINITSID_UNLABELED; | |
1704 | rc = -ENOENT; | |
1705 | goto out; | |
1706 | } | |
1707 | ||
1708 | if (!c->sid[0]) { | |
1709 | rc = sidtab_context_to_sid(&sidtab, | |
1710 | &c->context[0], | |
1711 | &c->sid[0]); | |
1712 | if (rc) | |
1713 | goto out; | |
1714 | } | |
1715 | ||
1716 | *sid = c->sid[0]; | |
1717 | out: | |
1718 | POLICY_RDUNLOCK; | |
1719 | return rc; | |
1720 | } | |
1721 | ||
1722 | /** | |
1723 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
1724 | * @fstype: filesystem type | |
1725 | * @behavior: labeling behavior | |
1726 | * @sid: SID for filesystem (superblock) | |
1727 | */ | |
1728 | int security_fs_use( | |
1729 | const char *fstype, | |
1730 | unsigned int *behavior, | |
1731 | u32 *sid) | |
1732 | { | |
1733 | int rc = 0; | |
1734 | struct ocontext *c; | |
1735 | ||
1736 | POLICY_RDLOCK; | |
1737 | ||
1738 | c = policydb.ocontexts[OCON_FSUSE]; | |
1739 | while (c) { | |
1740 | if (strcmp(fstype, c->u.name) == 0) | |
1741 | break; | |
1742 | c = c->next; | |
1743 | } | |
1744 | ||
1745 | if (c) { | |
1746 | *behavior = c->v.behavior; | |
1747 | if (!c->sid[0]) { | |
1748 | rc = sidtab_context_to_sid(&sidtab, | |
1749 | &c->context[0], | |
1750 | &c->sid[0]); | |
1751 | if (rc) | |
1752 | goto out; | |
1753 | } | |
1754 | *sid = c->sid[0]; | |
1755 | } else { | |
1756 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); | |
1757 | if (rc) { | |
1758 | *behavior = SECURITY_FS_USE_NONE; | |
1759 | rc = 0; | |
1760 | } else { | |
1761 | *behavior = SECURITY_FS_USE_GENFS; | |
1762 | } | |
1763 | } | |
1764 | ||
1765 | out: | |
1766 | POLICY_RDUNLOCK; | |
1767 | return rc; | |
1768 | } | |
1769 | ||
1770 | int security_get_bools(int *len, char ***names, int **values) | |
1771 | { | |
1772 | int i, rc = -ENOMEM; | |
1773 | ||
1774 | POLICY_RDLOCK; | |
1775 | *names = NULL; | |
1776 | *values = NULL; | |
1777 | ||
1778 | *len = policydb.p_bools.nprim; | |
1779 | if (!*len) { | |
1780 | rc = 0; | |
1781 | goto out; | |
1782 | } | |
1783 | ||
e0795cf4 | 1784 | *names = kcalloc(*len, sizeof(char*), GFP_ATOMIC); |
1da177e4 LT |
1785 | if (!*names) |
1786 | goto err; | |
1da177e4 | 1787 | |
e0795cf4 | 1788 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); |
1da177e4 LT |
1789 | if (!*values) |
1790 | goto err; | |
1791 | ||
1792 | for (i = 0; i < *len; i++) { | |
1793 | size_t name_len; | |
1794 | (*values)[i] = policydb.bool_val_to_struct[i]->state; | |
1795 | name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; | |
e0795cf4 | 1796 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); |
1da177e4 LT |
1797 | if (!(*names)[i]) |
1798 | goto err; | |
1799 | strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); | |
1800 | (*names)[i][name_len - 1] = 0; | |
1801 | } | |
1802 | rc = 0; | |
1803 | out: | |
1804 | POLICY_RDUNLOCK; | |
1805 | return rc; | |
1806 | err: | |
1807 | if (*names) { | |
1808 | for (i = 0; i < *len; i++) | |
9a5f04bf | 1809 | kfree((*names)[i]); |
1da177e4 | 1810 | } |
9a5f04bf | 1811 | kfree(*values); |
1da177e4 LT |
1812 | goto out; |
1813 | } | |
1814 | ||
1815 | ||
1816 | int security_set_bools(int len, int *values) | |
1817 | { | |
1818 | int i, rc = 0; | |
1819 | int lenp, seqno = 0; | |
1820 | struct cond_node *cur; | |
1821 | ||
1822 | POLICY_WRLOCK; | |
1823 | ||
1824 | lenp = policydb.p_bools.nprim; | |
1825 | if (len != lenp) { | |
1826 | rc = -EFAULT; | |
1827 | goto out; | |
1828 | } | |
1829 | ||
1da177e4 | 1830 | for (i = 0; i < len; i++) { |
af601e46 SG |
1831 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
1832 | audit_log(current->audit_context, GFP_ATOMIC, | |
1833 | AUDIT_MAC_CONFIG_CHANGE, | |
1834 | "bool=%s val=%d old_val=%d auid=%u", | |
1835 | policydb.p_bool_val_to_name[i], | |
1836 | !!values[i], | |
1837 | policydb.bool_val_to_struct[i]->state, | |
1838 | audit_get_loginuid(current->audit_context)); | |
1839 | } | |
1da177e4 LT |
1840 | if (values[i]) { |
1841 | policydb.bool_val_to_struct[i]->state = 1; | |
1842 | } else { | |
1843 | policydb.bool_val_to_struct[i]->state = 0; | |
1844 | } | |
1da177e4 | 1845 | } |
1da177e4 LT |
1846 | |
1847 | for (cur = policydb.cond_list; cur != NULL; cur = cur->next) { | |
1848 | rc = evaluate_cond_node(&policydb, cur); | |
1849 | if (rc) | |
1850 | goto out; | |
1851 | } | |
1852 | ||
1853 | seqno = ++latest_granting; | |
1854 | ||
1855 | out: | |
1856 | POLICY_WRUNLOCK; | |
1857 | if (!rc) { | |
1858 | avc_ss_reset(seqno); | |
1859 | selnl_notify_policyload(seqno); | |
342a0cff | 1860 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1861 | } |
1862 | return rc; | |
1863 | } | |
1864 | ||
1865 | int security_get_bool_value(int bool) | |
1866 | { | |
1867 | int rc = 0; | |
1868 | int len; | |
1869 | ||
1870 | POLICY_RDLOCK; | |
1871 | ||
1872 | len = policydb.p_bools.nprim; | |
1873 | if (bool >= len) { | |
1874 | rc = -EFAULT; | |
1875 | goto out; | |
1876 | } | |
1877 | ||
1878 | rc = policydb.bool_val_to_struct[bool]->state; | |
1879 | out: | |
1880 | POLICY_RDUNLOCK; | |
1881 | return rc; | |
1882 | } | |
376bd9cb | 1883 | |
08554d6b VY |
1884 | /* |
1885 | * security_sid_mls_copy() - computes a new sid based on the given | |
1886 | * sid and the mls portion of mls_sid. | |
1887 | */ | |
1888 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
1889 | { | |
1890 | struct context *context1; | |
1891 | struct context *context2; | |
1892 | struct context newcon; | |
1893 | char *s; | |
1894 | u32 len; | |
1895 | int rc = 0; | |
1896 | ||
4eb327b5 | 1897 | if (!ss_initialized || !selinux_mls_enabled) { |
08554d6b VY |
1898 | *new_sid = sid; |
1899 | goto out; | |
1900 | } | |
1901 | ||
1902 | context_init(&newcon); | |
1903 | ||
1904 | POLICY_RDLOCK; | |
1905 | context1 = sidtab_search(&sidtab, sid); | |
1906 | if (!context1) { | |
1907 | printk(KERN_ERR "security_sid_mls_copy: unrecognized SID " | |
1908 | "%d\n", sid); | |
1909 | rc = -EINVAL; | |
1910 | goto out_unlock; | |
1911 | } | |
1912 | ||
1913 | context2 = sidtab_search(&sidtab, mls_sid); | |
1914 | if (!context2) { | |
1915 | printk(KERN_ERR "security_sid_mls_copy: unrecognized SID " | |
1916 | "%d\n", mls_sid); | |
1917 | rc = -EINVAL; | |
1918 | goto out_unlock; | |
1919 | } | |
1920 | ||
1921 | newcon.user = context1->user; | |
1922 | newcon.role = context1->role; | |
1923 | newcon.type = context1->type; | |
0efc61ea | 1924 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
1925 | if (rc) |
1926 | goto out_unlock; | |
1927 | ||
08554d6b VY |
1928 | /* Check the validity of the new context. */ |
1929 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
1930 | rc = convert_context_handle_invalid_context(&newcon); | |
1931 | if (rc) | |
1932 | goto bad; | |
1933 | } | |
1934 | ||
1935 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
1936 | goto out_unlock; | |
1937 | ||
1938 | bad: | |
1939 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
1940 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
1941 | "security_sid_mls_copy: invalid context %s", s); | |
1942 | kfree(s); | |
1943 | } | |
1944 | ||
1945 | out_unlock: | |
1946 | POLICY_RDUNLOCK; | |
1947 | context_destroy(&newcon); | |
1948 | out: | |
1949 | return rc; | |
1950 | } | |
1951 | ||
376bd9cb DG |
1952 | struct selinux_audit_rule { |
1953 | u32 au_seqno; | |
1954 | struct context au_ctxt; | |
1955 | }; | |
1956 | ||
1957 | void selinux_audit_rule_free(struct selinux_audit_rule *rule) | |
1958 | { | |
1959 | if (rule) { | |
1960 | context_destroy(&rule->au_ctxt); | |
1961 | kfree(rule); | |
1962 | } | |
1963 | } | |
1964 | ||
1965 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, | |
1966 | struct selinux_audit_rule **rule) | |
1967 | { | |
1968 | struct selinux_audit_rule *tmprule; | |
1969 | struct role_datum *roledatum; | |
1970 | struct type_datum *typedatum; | |
1971 | struct user_datum *userdatum; | |
1972 | int rc = 0; | |
1973 | ||
1974 | *rule = NULL; | |
1975 | ||
1976 | if (!ss_initialized) | |
1977 | return -ENOTSUPP; | |
1978 | ||
1979 | switch (field) { | |
3a6b9f85 DG |
1980 | case AUDIT_SUBJ_USER: |
1981 | case AUDIT_SUBJ_ROLE: | |
1982 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
1983 | case AUDIT_OBJ_USER: |
1984 | case AUDIT_OBJ_ROLE: | |
1985 | case AUDIT_OBJ_TYPE: | |
376bd9cb DG |
1986 | /* only 'equals' and 'not equals' fit user, role, and type */ |
1987 | if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL) | |
1988 | return -EINVAL; | |
1989 | break; | |
3a6b9f85 DG |
1990 | case AUDIT_SUBJ_SEN: |
1991 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
1992 | case AUDIT_OBJ_LEV_LOW: |
1993 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
1994 | /* we do not allow a range, indicated by the presense of '-' */ |
1995 | if (strchr(rulestr, '-')) | |
1996 | return -EINVAL; | |
1997 | break; | |
1998 | default: | |
1999 | /* only the above fields are valid */ | |
2000 | return -EINVAL; | |
2001 | } | |
2002 | ||
2003 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
2004 | if (!tmprule) | |
2005 | return -ENOMEM; | |
2006 | ||
2007 | context_init(&tmprule->au_ctxt); | |
2008 | ||
2009 | POLICY_RDLOCK; | |
2010 | ||
2011 | tmprule->au_seqno = latest_granting; | |
2012 | ||
2013 | switch (field) { | |
3a6b9f85 | 2014 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2015 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2016 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
2017 | if (!userdatum) | |
2018 | rc = -EINVAL; | |
2019 | else | |
2020 | tmprule->au_ctxt.user = userdatum->value; | |
2021 | break; | |
3a6b9f85 | 2022 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2023 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2024 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
2025 | if (!roledatum) | |
2026 | rc = -EINVAL; | |
2027 | else | |
2028 | tmprule->au_ctxt.role = roledatum->value; | |
2029 | break; | |
3a6b9f85 | 2030 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2031 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2032 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
2033 | if (!typedatum) | |
2034 | rc = -EINVAL; | |
2035 | else | |
2036 | tmprule->au_ctxt.type = typedatum->value; | |
2037 | break; | |
3a6b9f85 DG |
2038 | case AUDIT_SUBJ_SEN: |
2039 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2040 | case AUDIT_OBJ_LEV_LOW: |
2041 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2042 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
2043 | break; | |
2044 | } | |
2045 | ||
2046 | POLICY_RDUNLOCK; | |
2047 | ||
2048 | if (rc) { | |
2049 | selinux_audit_rule_free(tmprule); | |
2050 | tmprule = NULL; | |
2051 | } | |
2052 | ||
2053 | *rule = tmprule; | |
2054 | ||
2055 | return rc; | |
2056 | } | |
2057 | ||
9a2f44f0 | 2058 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, |
376bd9cb DG |
2059 | struct selinux_audit_rule *rule, |
2060 | struct audit_context *actx) | |
2061 | { | |
2062 | struct context *ctxt; | |
2063 | struct mls_level *level; | |
2064 | int match = 0; | |
2065 | ||
2066 | if (!rule) { | |
2067 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2068 | "selinux_audit_rule_match: missing rule\n"); | |
2069 | return -ENOENT; | |
2070 | } | |
2071 | ||
2072 | POLICY_RDLOCK; | |
2073 | ||
2074 | if (rule->au_seqno < latest_granting) { | |
2075 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2076 | "selinux_audit_rule_match: stale rule\n"); | |
2077 | match = -ESTALE; | |
2078 | goto out; | |
2079 | } | |
2080 | ||
9a2f44f0 | 2081 | ctxt = sidtab_search(&sidtab, sid); |
376bd9cb DG |
2082 | if (!ctxt) { |
2083 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2084 | "selinux_audit_rule_match: unrecognized SID %d\n", | |
9a2f44f0 | 2085 | sid); |
376bd9cb DG |
2086 | match = -ENOENT; |
2087 | goto out; | |
2088 | } | |
2089 | ||
2090 | /* a field/op pair that is not caught here will simply fall through | |
2091 | without a match */ | |
2092 | switch (field) { | |
3a6b9f85 | 2093 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2094 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2095 | switch (op) { |
2096 | case AUDIT_EQUAL: | |
2097 | match = (ctxt->user == rule->au_ctxt.user); | |
2098 | break; | |
2099 | case AUDIT_NOT_EQUAL: | |
2100 | match = (ctxt->user != rule->au_ctxt.user); | |
2101 | break; | |
2102 | } | |
2103 | break; | |
3a6b9f85 | 2104 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2105 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2106 | switch (op) { |
2107 | case AUDIT_EQUAL: | |
2108 | match = (ctxt->role == rule->au_ctxt.role); | |
2109 | break; | |
2110 | case AUDIT_NOT_EQUAL: | |
2111 | match = (ctxt->role != rule->au_ctxt.role); | |
2112 | break; | |
2113 | } | |
2114 | break; | |
3a6b9f85 | 2115 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2116 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2117 | switch (op) { |
2118 | case AUDIT_EQUAL: | |
2119 | match = (ctxt->type == rule->au_ctxt.type); | |
2120 | break; | |
2121 | case AUDIT_NOT_EQUAL: | |
2122 | match = (ctxt->type != rule->au_ctxt.type); | |
2123 | break; | |
2124 | } | |
2125 | break; | |
3a6b9f85 DG |
2126 | case AUDIT_SUBJ_SEN: |
2127 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2128 | case AUDIT_OBJ_LEV_LOW: |
2129 | case AUDIT_OBJ_LEV_HIGH: | |
2130 | level = ((field == AUDIT_SUBJ_SEN || | |
2131 | field == AUDIT_OBJ_LEV_LOW) ? | |
376bd9cb DG |
2132 | &ctxt->range.level[0] : &ctxt->range.level[1]); |
2133 | switch (op) { | |
2134 | case AUDIT_EQUAL: | |
2135 | match = mls_level_eq(&rule->au_ctxt.range.level[0], | |
2136 | level); | |
2137 | break; | |
2138 | case AUDIT_NOT_EQUAL: | |
2139 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2140 | level); | |
2141 | break; | |
2142 | case AUDIT_LESS_THAN: | |
2143 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], | |
2144 | level) && | |
2145 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2146 | level)); | |
2147 | break; | |
2148 | case AUDIT_LESS_THAN_OR_EQUAL: | |
2149 | match = mls_level_dom(&rule->au_ctxt.range.level[0], | |
2150 | level); | |
2151 | break; | |
2152 | case AUDIT_GREATER_THAN: | |
2153 | match = (mls_level_dom(level, | |
2154 | &rule->au_ctxt.range.level[0]) && | |
2155 | !mls_level_eq(level, | |
2156 | &rule->au_ctxt.range.level[0])); | |
2157 | break; | |
2158 | case AUDIT_GREATER_THAN_OR_EQUAL: | |
2159 | match = mls_level_dom(level, | |
2160 | &rule->au_ctxt.range.level[0]); | |
2161 | break; | |
2162 | } | |
2163 | } | |
2164 | ||
2165 | out: | |
2166 | POLICY_RDUNLOCK; | |
2167 | return match; | |
2168 | } | |
2169 | ||
2170 | static int (*aurule_callback)(void) = NULL; | |
2171 | ||
2172 | static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid, | |
2173 | u16 class, u32 perms, u32 *retained) | |
2174 | { | |
2175 | int err = 0; | |
2176 | ||
2177 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
2178 | err = aurule_callback(); | |
2179 | return err; | |
2180 | } | |
2181 | ||
2182 | static int __init aurule_init(void) | |
2183 | { | |
2184 | int err; | |
2185 | ||
2186 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET, | |
2187 | SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0); | |
2188 | if (err) | |
2189 | panic("avc_add_callback() failed, error %d\n", err); | |
2190 | ||
2191 | return err; | |
2192 | } | |
2193 | __initcall(aurule_init); | |
2194 | ||
2195 | void selinux_audit_set_callback(int (*callback)(void)) | |
2196 | { | |
2197 | aurule_callback = callback; | |
2198 | } | |
7420ed23 VY |
2199 | |
2200 | #ifdef CONFIG_NETLABEL | |
2201 | /* | |
5778eabd | 2202 | * NetLabel cache structure |
7420ed23 | 2203 | */ |
5778eabd | 2204 | #define NETLBL_CACHE(x) ((struct selinux_netlbl_cache *)(x)) |
7420ed23 VY |
2205 | #define NETLBL_CACHE_T_NONE 0 |
2206 | #define NETLBL_CACHE_T_SID 1 | |
2207 | #define NETLBL_CACHE_T_MLS 2 | |
5778eabd | 2208 | struct selinux_netlbl_cache { |
7420ed23 VY |
2209 | u32 type; |
2210 | union { | |
2211 | u32 sid; | |
2212 | struct mls_range mls_label; | |
2213 | } data; | |
2214 | }; | |
2215 | ||
2216 | /** | |
5778eabd | 2217 | * security_netlbl_cache_free - Free the NetLabel cached data |
7420ed23 VY |
2218 | * @data: the data to free |
2219 | * | |
2220 | * Description: | |
2221 | * This function is intended to be used as the free() callback inside the | |
2222 | * netlbl_lsm_cache structure. | |
2223 | * | |
2224 | */ | |
5778eabd | 2225 | static void security_netlbl_cache_free(const void *data) |
7420ed23 | 2226 | { |
5778eabd | 2227 | struct selinux_netlbl_cache *cache; |
ffb733c6 | 2228 | |
2229 | if (data == NULL) | |
2230 | return; | |
2231 | ||
2232 | cache = NETLBL_CACHE(data); | |
7420ed23 VY |
2233 | switch (cache->type) { |
2234 | case NETLBL_CACHE_T_MLS: | |
2235 | ebitmap_destroy(&cache->data.mls_label.level[0].cat); | |
2236 | break; | |
2237 | } | |
2238 | kfree(data); | |
2239 | } | |
2240 | ||
2241 | /** | |
5778eabd PM |
2242 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
2243 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
2244 | * @ctx: the SELinux context |
2245 | * | |
2246 | * Description: | |
2247 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
2248 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
2249 | * already been initialized. | |
7420ed23 VY |
2250 | * |
2251 | */ | |
5778eabd PM |
2252 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
2253 | struct context *ctx) | |
7420ed23 | 2254 | { |
5778eabd | 2255 | struct selinux_netlbl_cache *cache = NULL; |
7420ed23 | 2256 | |
5778eabd PM |
2257 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
2258 | if (secattr->cache == NULL) | |
2259 | return; | |
7420ed23 VY |
2260 | |
2261 | cache = kzalloc(sizeof(*cache), GFP_ATOMIC); | |
2262 | if (cache == NULL) | |
5778eabd | 2263 | return; |
7420ed23 VY |
2264 | |
2265 | cache->type = NETLBL_CACHE_T_MLS; | |
2266 | if (ebitmap_cpy(&cache->data.mls_label.level[0].cat, | |
2267 | &ctx->range.level[0].cat) != 0) | |
5778eabd | 2268 | return; |
7420ed23 VY |
2269 | cache->data.mls_label.level[1].cat.highbit = |
2270 | cache->data.mls_label.level[0].cat.highbit; | |
2271 | cache->data.mls_label.level[1].cat.node = | |
2272 | cache->data.mls_label.level[0].cat.node; | |
2273 | cache->data.mls_label.level[0].sens = ctx->range.level[0].sens; | |
2274 | cache->data.mls_label.level[1].sens = ctx->range.level[0].sens; | |
2275 | ||
5778eabd PM |
2276 | secattr->cache->free = security_netlbl_cache_free; |
2277 | secattr->cache->data = (void *)cache; | |
2278 | secattr->flags |= NETLBL_SECATTR_CACHE; | |
7420ed23 VY |
2279 | } |
2280 | ||
2281 | /** | |
5778eabd | 2282 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 VY |
2283 | * @secattr: the NetLabel packet security attributes |
2284 | * @base_sid: the SELinux SID to use as a context for MLS only attributes | |
2285 | * @sid: the SELinux SID | |
2286 | * | |
2287 | * Description: | |
5778eabd | 2288 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 2289 | * SELinux SID. If the @secattr field does not contain a full SELinux |
5778eabd PM |
2290 | * SID/context then use the context in @base_sid as the foundation. If |
2291 | * possibile the 'cache' field of @secattr is set and the CACHE flag is set; | |
2292 | * this is to allow the @secattr to be used by NetLabel to cache the secattr to | |
2293 | * SID conversion for future lookups. Returns zero on success, negative | |
2294 | * values on failure. | |
7420ed23 VY |
2295 | * |
2296 | */ | |
5778eabd PM |
2297 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
2298 | u32 base_sid, | |
2299 | u32 *sid) | |
7420ed23 VY |
2300 | { |
2301 | int rc = -EIDRM; | |
2302 | struct context *ctx; | |
2303 | struct context ctx_new; | |
5778eabd PM |
2304 | struct selinux_netlbl_cache *cache; |
2305 | ||
2306 | if (!ss_initialized) { | |
2307 | *sid = SECSID_NULL; | |
2308 | return 0; | |
2309 | } | |
7420ed23 VY |
2310 | |
2311 | POLICY_RDLOCK; | |
2312 | ||
701a90ba | 2313 | if (secattr->flags & NETLBL_SECATTR_CACHE) { |
ffb733c6 | 2314 | cache = NETLBL_CACHE(secattr->cache->data); |
7420ed23 VY |
2315 | switch (cache->type) { |
2316 | case NETLBL_CACHE_T_SID: | |
2317 | *sid = cache->data.sid; | |
2318 | rc = 0; | |
2319 | break; | |
2320 | case NETLBL_CACHE_T_MLS: | |
2321 | ctx = sidtab_search(&sidtab, base_sid); | |
2322 | if (ctx == NULL) | |
2323 | goto netlbl_secattr_to_sid_return; | |
2324 | ||
2325 | ctx_new.user = ctx->user; | |
2326 | ctx_new.role = ctx->role; | |
2327 | ctx_new.type = ctx->type; | |
2328 | ctx_new.range.level[0].sens = | |
2329 | cache->data.mls_label.level[0].sens; | |
2330 | ctx_new.range.level[0].cat.highbit = | |
2331 | cache->data.mls_label.level[0].cat.highbit; | |
2332 | ctx_new.range.level[0].cat.node = | |
2333 | cache->data.mls_label.level[0].cat.node; | |
2334 | ctx_new.range.level[1].sens = | |
2335 | cache->data.mls_label.level[1].sens; | |
2336 | ctx_new.range.level[1].cat.highbit = | |
2337 | cache->data.mls_label.level[1].cat.highbit; | |
2338 | ctx_new.range.level[1].cat.node = | |
2339 | cache->data.mls_label.level[1].cat.node; | |
2340 | ||
2341 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
2342 | break; | |
2343 | default: | |
2344 | goto netlbl_secattr_to_sid_return; | |
2345 | } | |
701a90ba | 2346 | } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
7420ed23 VY |
2347 | ctx = sidtab_search(&sidtab, base_sid); |
2348 | if (ctx == NULL) | |
2349 | goto netlbl_secattr_to_sid_return; | |
2350 | ||
2351 | ctx_new.user = ctx->user; | |
2352 | ctx_new.role = ctx->role; | |
2353 | ctx_new.type = ctx->type; | |
02752760 | 2354 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 2355 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
02752760 PM |
2356 | if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat, |
2357 | secattr->mls_cat) != 0) | |
7420ed23 VY |
2358 | goto netlbl_secattr_to_sid_return; |
2359 | ctx_new.range.level[1].cat.highbit = | |
2360 | ctx_new.range.level[0].cat.highbit; | |
2361 | ctx_new.range.level[1].cat.node = | |
2362 | ctx_new.range.level[0].cat.node; | |
2363 | } else { | |
2364 | ebitmap_init(&ctx_new.range.level[0].cat); | |
2365 | ebitmap_init(&ctx_new.range.level[1].cat); | |
2366 | } | |
2367 | if (mls_context_isvalid(&policydb, &ctx_new) != 1) | |
2368 | goto netlbl_secattr_to_sid_return_cleanup; | |
2369 | ||
2370 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
2371 | if (rc != 0) | |
2372 | goto netlbl_secattr_to_sid_return_cleanup; | |
2373 | ||
5778eabd PM |
2374 | security_netlbl_cache_add(secattr, &ctx_new); |
2375 | ||
7420ed23 VY |
2376 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
2377 | } else { | |
388b2405 | 2378 | *sid = SECSID_NULL; |
7420ed23 VY |
2379 | rc = 0; |
2380 | } | |
2381 | ||
2382 | netlbl_secattr_to_sid_return: | |
2383 | POLICY_RDUNLOCK; | |
2384 | return rc; | |
2385 | netlbl_secattr_to_sid_return_cleanup: | |
2386 | ebitmap_destroy(&ctx_new.range.level[0].cat); | |
2387 | goto netlbl_secattr_to_sid_return; | |
2388 | } | |
2389 | ||
2390 | /** | |
5778eabd PM |
2391 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
2392 | * @sid: the SELinux SID | |
2393 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
2394 | * |
2395 | * Description: | |
5778eabd PM |
2396 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
2397 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
2398 | * |
2399 | */ | |
5778eabd | 2400 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 VY |
2401 | { |
2402 | int rc = -ENOENT; | |
7420ed23 VY |
2403 | struct context *ctx; |
2404 | ||
5778eabd PM |
2405 | netlbl_secattr_init(secattr); |
2406 | ||
7420ed23 VY |
2407 | if (!ss_initialized) |
2408 | return 0; | |
2409 | ||
2410 | POLICY_RDLOCK; | |
7420ed23 VY |
2411 | ctx = sidtab_search(&sidtab, sid); |
2412 | if (ctx == NULL) | |
5778eabd PM |
2413 | goto netlbl_sid_to_secattr_failure; |
2414 | secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], | |
2415 | GFP_ATOMIC); | |
2416 | secattr->flags |= NETLBL_SECATTR_DOMAIN; | |
2417 | mls_export_netlbl_lvl(ctx, secattr); | |
2418 | rc = mls_export_netlbl_cat(ctx, secattr); | |
bf0edf39 | 2419 | if (rc != 0) |
5778eabd | 2420 | goto netlbl_sid_to_secattr_failure; |
7420ed23 | 2421 | POLICY_RDUNLOCK; |
99f59ed0 | 2422 | |
5778eabd | 2423 | return 0; |
f8687afe | 2424 | |
5778eabd PM |
2425 | netlbl_sid_to_secattr_failure: |
2426 | POLICY_RDUNLOCK; | |
2427 | netlbl_secattr_destroy(secattr); | |
f8687afe PM |
2428 | return rc; |
2429 | } | |
7420ed23 | 2430 | #endif /* CONFIG_NETLABEL */ |