]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Implementation of the security services. | |
3 | * | |
4 | * Authors : Stephen Smalley, <sds@epoch.ncsc.mil> | |
5d55a345 | 5 | * James Morris <jmorris@redhat.com> |
1da177e4 LT |
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 | * | |
5d55a345 | 14 | * Added conditional policy language extensions |
1da177e4 | 15 | * |
7420ed23 VY |
16 | * Updated: Hewlett-Packard <paul.moore@hp.com> |
17 | * | |
18 | * Added support for NetLabel | |
3bb56b25 | 19 | * Added support for the policy capability bitmap |
7420ed23 | 20 | * |
b94c7e67 CS |
21 | * Updated: Chad Sellers <csellers@tresys.com> |
22 | * | |
23 | * Added validation of kernel classes and permissions | |
24 | * | |
3bb56b25 | 25 | * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. |
376bd9cb | 26 | * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. |
b94c7e67 | 27 | * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC |
1da177e4 LT |
28 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> |
29 | * This program is free software; you can redistribute it and/or modify | |
5d55a345 | 30 | * it under the terms of the GNU General Public License as published by |
1da177e4 LT |
31 | * the Free Software Foundation, version 2. |
32 | */ | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/string.h> | |
36 | #include <linux/spinlock.h> | |
9f2ad665 | 37 | #include <linux/rcupdate.h> |
1da177e4 LT |
38 | #include <linux/errno.h> |
39 | #include <linux/in.h> | |
40 | #include <linux/sched.h> | |
41 | #include <linux/audit.h> | |
bb003079 | 42 | #include <linux/mutex.h> |
0e55a004 | 43 | #include <linux/selinux.h> |
7420ed23 | 44 | #include <net/netlabel.h> |
bb003079 | 45 | |
1da177e4 LT |
46 | #include "flask.h" |
47 | #include "avc.h" | |
48 | #include "avc_ss.h" | |
49 | #include "security.h" | |
50 | #include "context.h" | |
51 | #include "policydb.h" | |
52 | #include "sidtab.h" | |
53 | #include "services.h" | |
54 | #include "conditional.h" | |
55 | #include "mls.h" | |
7420ed23 | 56 | #include "objsec.h" |
c60475bf | 57 | #include "netlabel.h" |
3de4bab5 | 58 | #include "xfrm.h" |
02752760 | 59 | #include "ebitmap.h" |
9d57a7f9 | 60 | #include "audit.h" |
1da177e4 LT |
61 | |
62 | extern void selnl_notify_policyload(u32 seqno); | |
63 | unsigned int policydb_loaded_version; | |
64 | ||
3bb56b25 | 65 | int selinux_policycap_netpeer; |
b0c636b9 | 66 | int selinux_policycap_openperm; |
3bb56b25 | 67 | |
b94c7e67 CS |
68 | /* |
69 | * This is declared in avc.c | |
70 | */ | |
71 | extern const struct selinux_class_perm selinux_class_perm; | |
72 | ||
1da177e4 LT |
73 | static DEFINE_RWLOCK(policy_rwlock); |
74 | #define POLICY_RDLOCK read_lock(&policy_rwlock) | |
75 | #define POLICY_WRLOCK write_lock_irq(&policy_rwlock) | |
76 | #define POLICY_RDUNLOCK read_unlock(&policy_rwlock) | |
77 | #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock) | |
78 | ||
bb003079 IM |
79 | static DEFINE_MUTEX(load_mutex); |
80 | #define LOAD_LOCK mutex_lock(&load_mutex) | |
81 | #define LOAD_UNLOCK mutex_unlock(&load_mutex) | |
1da177e4 LT |
82 | |
83 | static struct sidtab sidtab; | |
84 | struct policydb policydb; | |
5d55a345 | 85 | int ss_initialized; |
1da177e4 LT |
86 | |
87 | /* | |
88 | * The largest sequence number that has been used when | |
89 | * providing an access decision to the access vector cache. | |
90 | * The sequence number only changes when a policy change | |
91 | * occurs. | |
92 | */ | |
5d55a345 | 93 | static u32 latest_granting; |
1da177e4 LT |
94 | |
95 | /* Forward declaration. */ | |
96 | static int context_struct_to_string(struct context *context, char **scontext, | |
97 | u32 *scontext_len); | |
98 | ||
99 | /* | |
100 | * Return the boolean value of a constraint expression | |
101 | * when it is applied to the specified source and target | |
102 | * security contexts. | |
103 | * | |
104 | * xcontext is a special beast... It is used by the validatetrans rules | |
105 | * only. For these rules, scontext is the context before the transition, | |
106 | * tcontext is the context after the transition, and xcontext is the context | |
107 | * of the process performing the transition. All other callers of | |
108 | * constraint_expr_eval should pass in NULL for xcontext. | |
109 | */ | |
110 | static int constraint_expr_eval(struct context *scontext, | |
111 | struct context *tcontext, | |
112 | struct context *xcontext, | |
113 | struct constraint_expr *cexpr) | |
114 | { | |
115 | u32 val1, val2; | |
116 | struct context *c; | |
117 | struct role_datum *r1, *r2; | |
118 | struct mls_level *l1, *l2; | |
119 | struct constraint_expr *e; | |
120 | int s[CEXPR_MAXDEPTH]; | |
121 | int sp = -1; | |
122 | ||
123 | for (e = cexpr; e; e = e->next) { | |
124 | switch (e->expr_type) { | |
125 | case CEXPR_NOT: | |
126 | BUG_ON(sp < 0); | |
127 | s[sp] = !s[sp]; | |
128 | break; | |
129 | case CEXPR_AND: | |
130 | BUG_ON(sp < 1); | |
131 | sp--; | |
132 | s[sp] &= s[sp+1]; | |
133 | break; | |
134 | case CEXPR_OR: | |
135 | BUG_ON(sp < 1); | |
136 | sp--; | |
137 | s[sp] |= s[sp+1]; | |
138 | break; | |
139 | case CEXPR_ATTR: | |
140 | if (sp == (CEXPR_MAXDEPTH-1)) | |
141 | return 0; | |
142 | switch (e->attr) { | |
143 | case CEXPR_USER: | |
144 | val1 = scontext->user; | |
145 | val2 = tcontext->user; | |
146 | break; | |
147 | case CEXPR_TYPE: | |
148 | val1 = scontext->type; | |
149 | val2 = tcontext->type; | |
150 | break; | |
151 | case CEXPR_ROLE: | |
152 | val1 = scontext->role; | |
153 | val2 = tcontext->role; | |
154 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
155 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
156 | switch (e->op) { | |
157 | case CEXPR_DOM: | |
158 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
159 | val2 - 1); | |
160 | continue; | |
161 | case CEXPR_DOMBY: | |
162 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
163 | val1 - 1); | |
164 | continue; | |
165 | case CEXPR_INCOMP: | |
5d55a345 EP |
166 | s[++sp] = (!ebitmap_get_bit(&r1->dominates, |
167 | val2 - 1) && | |
168 | !ebitmap_get_bit(&r2->dominates, | |
169 | val1 - 1)); | |
1da177e4 LT |
170 | continue; |
171 | default: | |
172 | break; | |
173 | } | |
174 | break; | |
175 | case CEXPR_L1L2: | |
176 | l1 = &(scontext->range.level[0]); | |
177 | l2 = &(tcontext->range.level[0]); | |
178 | goto mls_ops; | |
179 | case CEXPR_L1H2: | |
180 | l1 = &(scontext->range.level[0]); | |
181 | l2 = &(tcontext->range.level[1]); | |
182 | goto mls_ops; | |
183 | case CEXPR_H1L2: | |
184 | l1 = &(scontext->range.level[1]); | |
185 | l2 = &(tcontext->range.level[0]); | |
186 | goto mls_ops; | |
187 | case CEXPR_H1H2: | |
188 | l1 = &(scontext->range.level[1]); | |
189 | l2 = &(tcontext->range.level[1]); | |
190 | goto mls_ops; | |
191 | case CEXPR_L1H1: | |
192 | l1 = &(scontext->range.level[0]); | |
193 | l2 = &(scontext->range.level[1]); | |
194 | goto mls_ops; | |
195 | case CEXPR_L2H2: | |
196 | l1 = &(tcontext->range.level[0]); | |
197 | l2 = &(tcontext->range.level[1]); | |
198 | goto mls_ops; | |
199 | mls_ops: | |
200 | switch (e->op) { | |
201 | case CEXPR_EQ: | |
202 | s[++sp] = mls_level_eq(l1, l2); | |
203 | continue; | |
204 | case CEXPR_NEQ: | |
205 | s[++sp] = !mls_level_eq(l1, l2); | |
206 | continue; | |
207 | case CEXPR_DOM: | |
208 | s[++sp] = mls_level_dom(l1, l2); | |
209 | continue; | |
210 | case CEXPR_DOMBY: | |
211 | s[++sp] = mls_level_dom(l2, l1); | |
212 | continue; | |
213 | case CEXPR_INCOMP: | |
214 | s[++sp] = mls_level_incomp(l2, l1); | |
215 | continue; | |
216 | default: | |
217 | BUG(); | |
218 | return 0; | |
219 | } | |
220 | break; | |
221 | default: | |
222 | BUG(); | |
223 | return 0; | |
224 | } | |
225 | ||
226 | switch (e->op) { | |
227 | case CEXPR_EQ: | |
228 | s[++sp] = (val1 == val2); | |
229 | break; | |
230 | case CEXPR_NEQ: | |
231 | s[++sp] = (val1 != val2); | |
232 | break; | |
233 | default: | |
234 | BUG(); | |
235 | return 0; | |
236 | } | |
237 | break; | |
238 | case CEXPR_NAMES: | |
239 | if (sp == (CEXPR_MAXDEPTH-1)) | |
240 | return 0; | |
241 | c = scontext; | |
242 | if (e->attr & CEXPR_TARGET) | |
243 | c = tcontext; | |
244 | else if (e->attr & CEXPR_XTARGET) { | |
245 | c = xcontext; | |
246 | if (!c) { | |
247 | BUG(); | |
248 | return 0; | |
249 | } | |
250 | } | |
251 | if (e->attr & CEXPR_USER) | |
252 | val1 = c->user; | |
253 | else if (e->attr & CEXPR_ROLE) | |
254 | val1 = c->role; | |
255 | else if (e->attr & CEXPR_TYPE) | |
256 | val1 = c->type; | |
257 | else { | |
258 | BUG(); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | switch (e->op) { | |
263 | case CEXPR_EQ: | |
264 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
265 | break; | |
266 | case CEXPR_NEQ: | |
267 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
268 | break; | |
269 | default: | |
270 | BUG(); | |
271 | return 0; | |
272 | } | |
273 | break; | |
274 | default: | |
275 | BUG(); | |
276 | return 0; | |
277 | } | |
278 | } | |
279 | ||
280 | BUG_ON(sp != 0); | |
281 | return s[0]; | |
282 | } | |
283 | ||
284 | /* | |
285 | * Compute access vectors based on a context structure pair for | |
286 | * the permissions in a particular class. | |
287 | */ | |
288 | static int context_struct_compute_av(struct context *scontext, | |
289 | struct context *tcontext, | |
290 | u16 tclass, | |
291 | u32 requested, | |
292 | struct av_decision *avd) | |
293 | { | |
294 | struct constraint_node *constraint; | |
295 | struct role_allow *ra; | |
296 | struct avtab_key avkey; | |
782ebb99 | 297 | struct avtab_node *node; |
1da177e4 | 298 | struct class_datum *tclass_datum; |
782ebb99 SS |
299 | struct ebitmap *sattr, *tattr; |
300 | struct ebitmap_node *snode, *tnode; | |
3f12070e | 301 | const struct selinux_class_perm *kdefs = &selinux_class_perm; |
782ebb99 | 302 | unsigned int i, j; |
1da177e4 LT |
303 | |
304 | /* | |
305 | * Remap extended Netlink classes for old policy versions. | |
306 | * Do this here rather than socket_type_to_security_class() | |
307 | * in case a newer policy version is loaded, allowing sockets | |
308 | * to remain in the correct class. | |
309 | */ | |
310 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
311 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
312 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
313 | tclass = SECCLASS_NETLINK_SOCKET; | |
314 | ||
1da177e4 LT |
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 | ||
3f12070e EP |
324 | /* |
325 | * Check for all the invalid cases. | |
326 | * - tclass 0 | |
327 | * - tclass > policy and > kernel | |
328 | * - tclass > policy but is a userspace class | |
329 | * - tclass > policy but we do not allow unknowns | |
330 | */ | |
331 | if (unlikely(!tclass)) | |
332 | goto inval_class; | |
333 | if (unlikely(tclass > policydb.p_classes.nprim)) | |
334 | if (tclass > kdefs->cts_len || | |
335 | !kdefs->class_to_string[tclass - 1] || | |
336 | !policydb.allow_unknown) | |
337 | goto inval_class; | |
338 | ||
339 | /* | |
340 | * Kernel class and we allow unknown so pad the allow decision | |
341 | * the pad will be all 1 for unknown classes. | |
342 | */ | |
343 | if (tclass <= kdefs->cts_len && policydb.allow_unknown) | |
344 | avd->allowed = policydb.undefined_perms[tclass - 1]; | |
345 | ||
346 | /* | |
347 | * Not in policy. Since decision is completed (all 1 or all 0) return. | |
348 | */ | |
349 | if (unlikely(tclass > policydb.p_classes.nprim)) | |
350 | return 0; | |
351 | ||
352 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
353 | ||
1da177e4 LT |
354 | /* |
355 | * If a specific type enforcement rule was defined for | |
356 | * this permission check, then use it. | |
357 | */ | |
1da177e4 | 358 | avkey.target_class = tclass; |
782ebb99 SS |
359 | avkey.specified = AVTAB_AV; |
360 | sattr = &policydb.type_attr_map[scontext->type - 1]; | |
361 | tattr = &policydb.type_attr_map[tcontext->type - 1]; | |
9fe79ad1 KK |
362 | ebitmap_for_each_positive_bit(sattr, snode, i) { |
363 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
782ebb99 SS |
364 | avkey.source_type = i + 1; |
365 | avkey.target_type = j + 1; | |
366 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
367 | node != NULL; | |
368 | node = avtab_search_node_next(node, avkey.specified)) { | |
369 | if (node->key.specified == AVTAB_ALLOWED) | |
370 | avd->allowed |= node->datum.data; | |
371 | else if (node->key.specified == AVTAB_AUDITALLOW) | |
372 | avd->auditallow |= node->datum.data; | |
373 | else if (node->key.specified == AVTAB_AUDITDENY) | |
374 | avd->auditdeny &= node->datum.data; | |
375 | } | |
1da177e4 | 376 | |
782ebb99 SS |
377 | /* Check conditional av table for additional permissions */ |
378 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); | |
379 | ||
380 | } | |
381 | } | |
1da177e4 LT |
382 | |
383 | /* | |
384 | * Remove any permissions prohibited by a constraint (this includes | |
385 | * the MLS policy). | |
386 | */ | |
387 | constraint = tclass_datum->constraints; | |
388 | while (constraint) { | |
389 | if ((constraint->permissions & (avd->allowed)) && | |
390 | !constraint_expr_eval(scontext, tcontext, NULL, | |
391 | constraint->expr)) { | |
392 | avd->allowed = (avd->allowed) & ~(constraint->permissions); | |
393 | } | |
394 | constraint = constraint->next; | |
395 | } | |
396 | ||
397 | /* | |
398 | * If checking process transition permission and the | |
399 | * role is changing, then check the (current_role, new_role) | |
400 | * pair. | |
401 | */ | |
402 | if (tclass == SECCLASS_PROCESS && | |
403 | (avd->allowed & (PROCESS__TRANSITION | PROCESS__DYNTRANSITION)) && | |
404 | scontext->role != tcontext->role) { | |
405 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
406 | if (scontext->role == ra->role && | |
407 | tcontext->role == ra->new_role) | |
408 | break; | |
409 | } | |
410 | if (!ra) | |
411 | avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION | | |
5d55a345 | 412 | PROCESS__DYNTRANSITION); |
1da177e4 LT |
413 | } |
414 | ||
415 | return 0; | |
3f12070e EP |
416 | |
417 | inval_class: | |
744ba35e EP |
418 | printk(KERN_ERR "SELinux: %s: unrecognized class %d\n", __func__, |
419 | tclass); | |
3f12070e | 420 | return -EINVAL; |
1da177e4 LT |
421 | } |
422 | ||
64dbf074 EP |
423 | /* |
424 | * Given a sid find if the type has the permissive flag set | |
425 | */ | |
426 | int security_permissive_sid(u32 sid) | |
427 | { | |
428 | struct context *context; | |
429 | u32 type; | |
430 | int rc; | |
431 | ||
432 | POLICY_RDLOCK; | |
433 | ||
434 | context = sidtab_search(&sidtab, sid); | |
435 | BUG_ON(!context); | |
436 | ||
437 | type = context->type; | |
438 | /* | |
439 | * we are intentionally using type here, not type-1, the 0th bit may | |
440 | * someday indicate that we are globally setting permissive in policy. | |
441 | */ | |
442 | rc = ebitmap_get_bit(&policydb.permissive_map, type); | |
443 | ||
444 | POLICY_RDUNLOCK; | |
445 | return rc; | |
446 | } | |
447 | ||
1da177e4 | 448 | static int security_validtrans_handle_fail(struct context *ocontext, |
5d55a345 EP |
449 | struct context *ncontext, |
450 | struct context *tcontext, | |
451 | u16 tclass) | |
1da177e4 LT |
452 | { |
453 | char *o = NULL, *n = NULL, *t = NULL; | |
454 | u32 olen, nlen, tlen; | |
455 | ||
456 | if (context_struct_to_string(ocontext, &o, &olen) < 0) | |
457 | goto out; | |
458 | if (context_struct_to_string(ncontext, &n, &nlen) < 0) | |
459 | goto out; | |
460 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
461 | goto out; | |
9ad9ad38 | 462 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
5d55a345 EP |
463 | "security_validate_transition: denied for" |
464 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", | |
465 | o, n, t, policydb.p_class_val_to_name[tclass-1]); | |
1da177e4 LT |
466 | out: |
467 | kfree(o); | |
468 | kfree(n); | |
469 | kfree(t); | |
470 | ||
471 | if (!selinux_enforcing) | |
472 | return 0; | |
473 | return -EPERM; | |
474 | } | |
475 | ||
476 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
5d55a345 | 477 | u16 tclass) |
1da177e4 LT |
478 | { |
479 | struct context *ocontext; | |
480 | struct context *ncontext; | |
481 | struct context *tcontext; | |
482 | struct class_datum *tclass_datum; | |
483 | struct constraint_node *constraint; | |
484 | int rc = 0; | |
485 | ||
486 | if (!ss_initialized) | |
487 | return 0; | |
488 | ||
489 | POLICY_RDLOCK; | |
490 | ||
491 | /* | |
492 | * Remap extended Netlink classes for old policy versions. | |
493 | * Do this here rather than socket_type_to_security_class() | |
494 | * in case a newer policy version is loaded, allowing sockets | |
495 | * to remain in the correct class. | |
496 | */ | |
497 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
498 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
499 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
500 | tclass = SECCLASS_NETLINK_SOCKET; | |
501 | ||
502 | if (!tclass || tclass > policydb.p_classes.nprim) { | |
744ba35e EP |
503 | printk(KERN_ERR "SELinux: %s: unrecognized class %d\n", |
504 | __func__, tclass); | |
1da177e4 LT |
505 | rc = -EINVAL; |
506 | goto out; | |
507 | } | |
508 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
509 | ||
510 | ocontext = sidtab_search(&sidtab, oldsid); | |
511 | if (!ocontext) { | |
744ba35e EP |
512 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
513 | __func__, oldsid); | |
1da177e4 LT |
514 | rc = -EINVAL; |
515 | goto out; | |
516 | } | |
517 | ||
518 | ncontext = sidtab_search(&sidtab, newsid); | |
519 | if (!ncontext) { | |
744ba35e EP |
520 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
521 | __func__, newsid); | |
1da177e4 LT |
522 | rc = -EINVAL; |
523 | goto out; | |
524 | } | |
525 | ||
526 | tcontext = sidtab_search(&sidtab, tasksid); | |
527 | if (!tcontext) { | |
744ba35e EP |
528 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
529 | __func__, tasksid); | |
1da177e4 LT |
530 | rc = -EINVAL; |
531 | goto out; | |
532 | } | |
533 | ||
534 | constraint = tclass_datum->validatetrans; | |
535 | while (constraint) { | |
536 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
5d55a345 | 537 | constraint->expr)) { |
1da177e4 | 538 | rc = security_validtrans_handle_fail(ocontext, ncontext, |
5d55a345 | 539 | tcontext, tclass); |
1da177e4 LT |
540 | goto out; |
541 | } | |
542 | constraint = constraint->next; | |
543 | } | |
544 | ||
545 | out: | |
546 | POLICY_RDUNLOCK; | |
547 | return rc; | |
548 | } | |
549 | ||
550 | /** | |
551 | * security_compute_av - Compute access vector decisions. | |
552 | * @ssid: source security identifier | |
553 | * @tsid: target security identifier | |
554 | * @tclass: target security class | |
555 | * @requested: requested permissions | |
556 | * @avd: access vector decisions | |
557 | * | |
558 | * Compute a set of access vector decisions based on the | |
559 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
560 | * Return -%EINVAL if any of the parameters are invalid or %0 | |
561 | * if the access vector decisions were computed successfully. | |
562 | */ | |
563 | int security_compute_av(u32 ssid, | |
564 | u32 tsid, | |
565 | u16 tclass, | |
566 | u32 requested, | |
567 | struct av_decision *avd) | |
568 | { | |
569 | struct context *scontext = NULL, *tcontext = NULL; | |
570 | int rc = 0; | |
571 | ||
572 | if (!ss_initialized) { | |
4c443d1b SS |
573 | avd->allowed = 0xffffffff; |
574 | avd->decided = 0xffffffff; | |
1da177e4 LT |
575 | avd->auditallow = 0; |
576 | avd->auditdeny = 0xffffffff; | |
577 | avd->seqno = latest_granting; | |
578 | return 0; | |
579 | } | |
580 | ||
581 | POLICY_RDLOCK; | |
582 | ||
583 | scontext = sidtab_search(&sidtab, ssid); | |
584 | if (!scontext) { | |
744ba35e EP |
585 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
586 | __func__, ssid); | |
1da177e4 LT |
587 | rc = -EINVAL; |
588 | goto out; | |
589 | } | |
590 | tcontext = sidtab_search(&sidtab, tsid); | |
591 | if (!tcontext) { | |
744ba35e EP |
592 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
593 | __func__, tsid); | |
1da177e4 LT |
594 | rc = -EINVAL; |
595 | goto out; | |
596 | } | |
597 | ||
598 | rc = context_struct_compute_av(scontext, tcontext, tclass, | |
599 | requested, avd); | |
600 | out: | |
601 | POLICY_RDUNLOCK; | |
602 | return rc; | |
603 | } | |
604 | ||
605 | /* | |
606 | * Write the security context string representation of | |
607 | * the context structure `context' into a dynamically | |
608 | * allocated string of the correct size. Set `*scontext' | |
609 | * to point to this string and set `*scontext_len' to | |
610 | * the length of the string. | |
611 | */ | |
612 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
613 | { | |
614 | char *scontextp; | |
615 | ||
616 | *scontext = NULL; | |
617 | *scontext_len = 0; | |
618 | ||
619 | /* Compute the size of the context. */ | |
620 | *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; | |
621 | *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; | |
622 | *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; | |
623 | *scontext_len += mls_compute_context_len(context); | |
624 | ||
625 | /* Allocate space for the context; caller must free this space. */ | |
626 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
5d55a345 | 627 | if (!scontextp) |
1da177e4 | 628 | return -ENOMEM; |
1da177e4 LT |
629 | *scontext = scontextp; |
630 | ||
631 | /* | |
632 | * Copy the user name, role name and type name into the context. | |
633 | */ | |
634 | sprintf(scontextp, "%s:%s:%s", | |
635 | policydb.p_user_val_to_name[context->user - 1], | |
636 | policydb.p_role_val_to_name[context->role - 1], | |
637 | policydb.p_type_val_to_name[context->type - 1]); | |
638 | scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + | |
5d55a345 EP |
639 | 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + |
640 | 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); | |
1da177e4 LT |
641 | |
642 | mls_sid_to_context(context, &scontextp); | |
643 | ||
644 | *scontextp = 0; | |
645 | ||
646 | return 0; | |
647 | } | |
648 | ||
649 | #include "initial_sid_to_string.h" | |
650 | ||
f0ee2e46 JC |
651 | const char *security_get_initial_sid_context(u32 sid) |
652 | { | |
653 | if (unlikely(sid > SECINITSID_NUM)) | |
654 | return NULL; | |
655 | return initial_sid_to_string[sid]; | |
656 | } | |
657 | ||
1da177e4 LT |
658 | /** |
659 | * security_sid_to_context - Obtain a context for a given SID. | |
660 | * @sid: security identifier, SID | |
661 | * @scontext: security context | |
662 | * @scontext_len: length in bytes | |
663 | * | |
664 | * Write the string representation of the context associated with @sid | |
665 | * into a dynamically allocated string of the correct size. Set @scontext | |
666 | * to point to this string and set @scontext_len to the length of the string. | |
667 | */ | |
668 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
669 | { | |
670 | struct context *context; | |
671 | int rc = 0; | |
672 | ||
4f4acf3a SS |
673 | *scontext = NULL; |
674 | *scontext_len = 0; | |
675 | ||
1da177e4 LT |
676 | if (!ss_initialized) { |
677 | if (sid <= SECINITSID_NUM) { | |
678 | char *scontextp; | |
679 | ||
680 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
5d55a345 | 681 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); |
0cccca06 SH |
682 | if (!scontextp) { |
683 | rc = -ENOMEM; | |
684 | goto out; | |
685 | } | |
1da177e4 LT |
686 | strcpy(scontextp, initial_sid_to_string[sid]); |
687 | *scontext = scontextp; | |
688 | goto out; | |
689 | } | |
744ba35e EP |
690 | printk(KERN_ERR "SELinux: %s: called before initial " |
691 | "load_policy on unknown SID %d\n", __func__, sid); | |
1da177e4 LT |
692 | rc = -EINVAL; |
693 | goto out; | |
694 | } | |
695 | POLICY_RDLOCK; | |
696 | context = sidtab_search(&sidtab, sid); | |
697 | if (!context) { | |
744ba35e EP |
698 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
699 | __func__, sid); | |
1da177e4 LT |
700 | rc = -EINVAL; |
701 | goto out_unlock; | |
702 | } | |
703 | rc = context_struct_to_string(context, scontext, scontext_len); | |
704 | out_unlock: | |
705 | POLICY_RDUNLOCK; | |
706 | out: | |
707 | return rc; | |
708 | ||
709 | } | |
710 | ||
8f0cfa52 | 711 | static int security_context_to_sid_core(const char *scontext, u32 scontext_len, |
869ab514 | 712 | u32 *sid, u32 def_sid, gfp_t gfp_flags) |
1da177e4 LT |
713 | { |
714 | char *scontext2; | |
715 | struct context context; | |
716 | struct role_datum *role; | |
717 | struct type_datum *typdatum; | |
718 | struct user_datum *usrdatum; | |
719 | char *scontextp, *p, oldc; | |
720 | int rc = 0; | |
721 | ||
722 | if (!ss_initialized) { | |
723 | int i; | |
724 | ||
725 | for (i = 1; i < SECINITSID_NUM; i++) { | |
726 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
727 | *sid = i; | |
728 | goto out; | |
729 | } | |
730 | } | |
731 | *sid = SECINITSID_KERNEL; | |
732 | goto out; | |
733 | } | |
734 | *sid = SECSID_NULL; | |
735 | ||
736 | /* Copy the string so that we can modify the copy as we parse it. | |
737 | The string should already by null terminated, but we append a | |
738 | null suffix to the copy to avoid problems with the existing | |
739 | attr package, which doesn't view the null terminator as part | |
740 | of the attribute value. */ | |
869ab514 | 741 | scontext2 = kmalloc(scontext_len+1, gfp_flags); |
1da177e4 LT |
742 | if (!scontext2) { |
743 | rc = -ENOMEM; | |
744 | goto out; | |
745 | } | |
746 | memcpy(scontext2, scontext, scontext_len); | |
747 | scontext2[scontext_len] = 0; | |
748 | ||
749 | context_init(&context); | |
750 | *sid = SECSID_NULL; | |
751 | ||
752 | POLICY_RDLOCK; | |
753 | ||
754 | /* Parse the security context. */ | |
755 | ||
756 | rc = -EINVAL; | |
757 | scontextp = (char *) scontext2; | |
758 | ||
759 | /* Extract the user. */ | |
760 | p = scontextp; | |
761 | while (*p && *p != ':') | |
762 | p++; | |
763 | ||
764 | if (*p == 0) | |
765 | goto out_unlock; | |
766 | ||
767 | *p++ = 0; | |
768 | ||
769 | usrdatum = hashtab_search(policydb.p_users.table, scontextp); | |
770 | if (!usrdatum) | |
771 | goto out_unlock; | |
772 | ||
773 | context.user = usrdatum->value; | |
774 | ||
775 | /* Extract role. */ | |
776 | scontextp = p; | |
777 | while (*p && *p != ':') | |
778 | p++; | |
779 | ||
780 | if (*p == 0) | |
781 | goto out_unlock; | |
782 | ||
783 | *p++ = 0; | |
784 | ||
785 | role = hashtab_search(policydb.p_roles.table, scontextp); | |
786 | if (!role) | |
787 | goto out_unlock; | |
788 | context.role = role->value; | |
789 | ||
790 | /* Extract type. */ | |
791 | scontextp = p; | |
792 | while (*p && *p != ':') | |
793 | p++; | |
794 | oldc = *p; | |
795 | *p++ = 0; | |
796 | ||
797 | typdatum = hashtab_search(policydb.p_types.table, scontextp); | |
798 | if (!typdatum) | |
799 | goto out_unlock; | |
800 | ||
801 | context.type = typdatum->value; | |
802 | ||
f5c1d5b2 | 803 | rc = mls_context_to_sid(oldc, &p, &context, &sidtab, def_sid); |
1da177e4 LT |
804 | if (rc) |
805 | goto out_unlock; | |
806 | ||
807 | if ((p - scontext2) < scontext_len) { | |
808 | rc = -EINVAL; | |
809 | goto out_unlock; | |
810 | } | |
811 | ||
812 | /* Check the validity of the new context. */ | |
813 | if (!policydb_context_isvalid(&policydb, &context)) { | |
814 | rc = -EINVAL; | |
815 | goto out_unlock; | |
816 | } | |
817 | /* Obtain the new sid. */ | |
818 | rc = sidtab_context_to_sid(&sidtab, &context, sid); | |
819 | out_unlock: | |
820 | POLICY_RDUNLOCK; | |
821 | context_destroy(&context); | |
822 | kfree(scontext2); | |
823 | out: | |
824 | return rc; | |
825 | } | |
826 | ||
f5c1d5b2 JM |
827 | /** |
828 | * security_context_to_sid - Obtain a SID for a given security context. | |
829 | * @scontext: security context | |
830 | * @scontext_len: length in bytes | |
831 | * @sid: security identifier, SID | |
832 | * | |
833 | * Obtains a SID associated with the security context that | |
834 | * has the string representation specified by @scontext. | |
835 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
836 | * memory is available, or 0 on success. | |
837 | */ | |
8f0cfa52 | 838 | int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid) |
f5c1d5b2 JM |
839 | { |
840 | return security_context_to_sid_core(scontext, scontext_len, | |
869ab514 | 841 | sid, SECSID_NULL, GFP_KERNEL); |
f5c1d5b2 JM |
842 | } |
843 | ||
844 | /** | |
845 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
846 | * falling back to specified default if needed. | |
847 | * | |
848 | * @scontext: security context | |
849 | * @scontext_len: length in bytes | |
850 | * @sid: security identifier, SID | |
d133a960 | 851 | * @def_sid: default SID to assign on error |
f5c1d5b2 JM |
852 | * |
853 | * Obtains a SID associated with the security context that | |
854 | * has the string representation specified by @scontext. | |
855 | * The default SID is passed to the MLS layer to be used to allow | |
856 | * kernel labeling of the MLS field if the MLS field is not present | |
857 | * (for upgrading to MLS without full relabel). | |
858 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
859 | * memory is available, or 0 on success. | |
860 | */ | |
869ab514 SS |
861 | int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *sid, |
862 | u32 def_sid, gfp_t gfp_flags) | |
f5c1d5b2 JM |
863 | { |
864 | return security_context_to_sid_core(scontext, scontext_len, | |
869ab514 | 865 | sid, def_sid, gfp_flags); |
f5c1d5b2 JM |
866 | } |
867 | ||
1da177e4 LT |
868 | static int compute_sid_handle_invalid_context( |
869 | struct context *scontext, | |
870 | struct context *tcontext, | |
871 | u16 tclass, | |
872 | struct context *newcontext) | |
873 | { | |
874 | char *s = NULL, *t = NULL, *n = NULL; | |
875 | u32 slen, tlen, nlen; | |
876 | ||
877 | if (context_struct_to_string(scontext, &s, &slen) < 0) | |
878 | goto out; | |
879 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
880 | goto out; | |
881 | if (context_struct_to_string(newcontext, &n, &nlen) < 0) | |
882 | goto out; | |
9ad9ad38 | 883 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
884 | "security_compute_sid: invalid context %s" |
885 | " for scontext=%s" | |
886 | " tcontext=%s" | |
887 | " tclass=%s", | |
888 | n, s, t, policydb.p_class_val_to_name[tclass-1]); | |
889 | out: | |
890 | kfree(s); | |
891 | kfree(t); | |
892 | kfree(n); | |
893 | if (!selinux_enforcing) | |
894 | return 0; | |
895 | return -EACCES; | |
896 | } | |
897 | ||
898 | static int security_compute_sid(u32 ssid, | |
899 | u32 tsid, | |
900 | u16 tclass, | |
901 | u32 specified, | |
902 | u32 *out_sid) | |
903 | { | |
904 | struct context *scontext = NULL, *tcontext = NULL, newcontext; | |
905 | struct role_trans *roletr = NULL; | |
906 | struct avtab_key avkey; | |
907 | struct avtab_datum *avdatum; | |
908 | struct avtab_node *node; | |
1da177e4 LT |
909 | int rc = 0; |
910 | ||
911 | if (!ss_initialized) { | |
912 | switch (tclass) { | |
913 | case SECCLASS_PROCESS: | |
914 | *out_sid = ssid; | |
915 | break; | |
916 | default: | |
917 | *out_sid = tsid; | |
918 | break; | |
919 | } | |
920 | goto out; | |
921 | } | |
922 | ||
851f8a69 VY |
923 | context_init(&newcontext); |
924 | ||
1da177e4 LT |
925 | POLICY_RDLOCK; |
926 | ||
927 | scontext = sidtab_search(&sidtab, ssid); | |
928 | if (!scontext) { | |
744ba35e EP |
929 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
930 | __func__, ssid); | |
1da177e4 LT |
931 | rc = -EINVAL; |
932 | goto out_unlock; | |
933 | } | |
934 | tcontext = sidtab_search(&sidtab, tsid); | |
935 | if (!tcontext) { | |
744ba35e EP |
936 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
937 | __func__, tsid); | |
1da177e4 LT |
938 | rc = -EINVAL; |
939 | goto out_unlock; | |
940 | } | |
941 | ||
1da177e4 LT |
942 | /* Set the user identity. */ |
943 | switch (specified) { | |
944 | case AVTAB_TRANSITION: | |
945 | case AVTAB_CHANGE: | |
946 | /* Use the process user identity. */ | |
947 | newcontext.user = scontext->user; | |
948 | break; | |
949 | case AVTAB_MEMBER: | |
950 | /* Use the related object owner. */ | |
951 | newcontext.user = tcontext->user; | |
952 | break; | |
953 | } | |
954 | ||
955 | /* Set the role and type to default values. */ | |
956 | switch (tclass) { | |
957 | case SECCLASS_PROCESS: | |
958 | /* Use the current role and type of process. */ | |
959 | newcontext.role = scontext->role; | |
960 | newcontext.type = scontext->type; | |
961 | break; | |
962 | default: | |
963 | /* Use the well-defined object role. */ | |
964 | newcontext.role = OBJECT_R_VAL; | |
965 | /* Use the type of the related object. */ | |
966 | newcontext.type = tcontext->type; | |
967 | } | |
968 | ||
969 | /* Look for a type transition/member/change rule. */ | |
970 | avkey.source_type = scontext->type; | |
971 | avkey.target_type = tcontext->type; | |
972 | avkey.target_class = tclass; | |
782ebb99 SS |
973 | avkey.specified = specified; |
974 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
975 | |
976 | /* If no permanent rule, also check for enabled conditional rules */ | |
5d55a345 | 977 | if (!avdatum) { |
782ebb99 | 978 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
1da177e4 | 979 | for (; node != NULL; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 980 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
981 | avdatum = &node->datum; |
982 | break; | |
983 | } | |
984 | } | |
985 | } | |
986 | ||
782ebb99 | 987 | if (avdatum) { |
1da177e4 | 988 | /* Use the type from the type transition/member/change rule. */ |
782ebb99 | 989 | newcontext.type = avdatum->data; |
1da177e4 LT |
990 | } |
991 | ||
992 | /* Check for class-specific changes. */ | |
993 | switch (tclass) { | |
994 | case SECCLASS_PROCESS: | |
995 | if (specified & AVTAB_TRANSITION) { | |
996 | /* Look for a role transition rule. */ | |
997 | for (roletr = policydb.role_tr; roletr; | |
998 | roletr = roletr->next) { | |
999 | if (roletr->role == scontext->role && | |
1000 | roletr->type == tcontext->type) { | |
1001 | /* Use the role transition rule. */ | |
1002 | newcontext.role = roletr->new_role; | |
1003 | break; | |
1004 | } | |
1005 | } | |
1006 | } | |
1007 | break; | |
1008 | default: | |
1009 | break; | |
1010 | } | |
1011 | ||
1012 | /* Set the MLS attributes. | |
1013 | This is done last because it may allocate memory. */ | |
1014 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext); | |
1015 | if (rc) | |
1016 | goto out_unlock; | |
1017 | ||
1018 | /* Check the validity of the context. */ | |
1019 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
1020 | rc = compute_sid_handle_invalid_context(scontext, | |
1021 | tcontext, | |
1022 | tclass, | |
1023 | &newcontext); | |
1024 | if (rc) | |
1025 | goto out_unlock; | |
1026 | } | |
1027 | /* Obtain the sid for the context. */ | |
1028 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
1029 | out_unlock: | |
1030 | POLICY_RDUNLOCK; | |
1031 | context_destroy(&newcontext); | |
1032 | out: | |
1033 | return rc; | |
1034 | } | |
1035 | ||
1036 | /** | |
1037 | * security_transition_sid - Compute the SID for a new subject/object. | |
1038 | * @ssid: source security identifier | |
1039 | * @tsid: target security identifier | |
1040 | * @tclass: target security class | |
1041 | * @out_sid: security identifier for new subject/object | |
1042 | * | |
1043 | * Compute a SID to use for labeling a new subject or object in the | |
1044 | * class @tclass based on a SID pair (@ssid, @tsid). | |
1045 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1046 | * if insufficient memory is available, or %0 if the new SID was | |
1047 | * computed successfully. | |
1048 | */ | |
1049 | int security_transition_sid(u32 ssid, | |
1050 | u32 tsid, | |
1051 | u16 tclass, | |
1052 | u32 *out_sid) | |
1053 | { | |
1054 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid); | |
1055 | } | |
1056 | ||
1057 | /** | |
1058 | * security_member_sid - Compute the SID for member selection. | |
1059 | * @ssid: source security identifier | |
1060 | * @tsid: target security identifier | |
1061 | * @tclass: target security class | |
1062 | * @out_sid: security identifier for selected member | |
1063 | * | |
1064 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1065 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1066 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1067 | * if insufficient memory is available, or %0 if the SID was | |
1068 | * computed successfully. | |
1069 | */ | |
1070 | int security_member_sid(u32 ssid, | |
1071 | u32 tsid, | |
1072 | u16 tclass, | |
1073 | u32 *out_sid) | |
1074 | { | |
1075 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid); | |
1076 | } | |
1077 | ||
1078 | /** | |
1079 | * security_change_sid - Compute the SID for object relabeling. | |
1080 | * @ssid: source security identifier | |
1081 | * @tsid: target security identifier | |
1082 | * @tclass: target security class | |
1083 | * @out_sid: security identifier for selected member | |
1084 | * | |
1085 | * Compute a SID to use for relabeling an object of class @tclass | |
1086 | * based on a SID pair (@ssid, @tsid). | |
1087 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1088 | * if insufficient memory is available, or %0 if the SID was | |
1089 | * computed successfully. | |
1090 | */ | |
1091 | int security_change_sid(u32 ssid, | |
1092 | u32 tsid, | |
1093 | u16 tclass, | |
1094 | u32 *out_sid) | |
1095 | { | |
1096 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid); | |
1097 | } | |
1098 | ||
b94c7e67 CS |
1099 | /* |
1100 | * Verify that each kernel class that is defined in the | |
1101 | * policy is correct | |
1102 | */ | |
1103 | static int validate_classes(struct policydb *p) | |
1104 | { | |
1105 | int i, j; | |
1106 | struct class_datum *cladatum; | |
1107 | struct perm_datum *perdatum; | |
1108 | u32 nprim, tmp, common_pts_len, perm_val, pol_val; | |
1109 | u16 class_val; | |
1110 | const struct selinux_class_perm *kdefs = &selinux_class_perm; | |
1111 | const char *def_class, *def_perm, *pol_class; | |
1112 | struct symtab *perms; | |
1113 | ||
3f12070e EP |
1114 | if (p->allow_unknown) { |
1115 | u32 num_classes = kdefs->cts_len; | |
1116 | p->undefined_perms = kcalloc(num_classes, sizeof(u32), GFP_KERNEL); | |
1117 | if (!p->undefined_perms) | |
1118 | return -ENOMEM; | |
1119 | } | |
1120 | ||
b94c7e67 CS |
1121 | for (i = 1; i < kdefs->cts_len; i++) { |
1122 | def_class = kdefs->class_to_string[i]; | |
a764ae4b SS |
1123 | if (!def_class) |
1124 | continue; | |
b94c7e67 CS |
1125 | if (i > p->p_classes.nprim) { |
1126 | printk(KERN_INFO | |
454d972c | 1127 | "SELinux: class %s not defined in policy\n", |
b94c7e67 | 1128 | def_class); |
3f12070e EP |
1129 | if (p->reject_unknown) |
1130 | return -EINVAL; | |
1131 | if (p->allow_unknown) | |
1132 | p->undefined_perms[i-1] = ~0U; | |
b94c7e67 CS |
1133 | continue; |
1134 | } | |
1135 | pol_class = p->p_class_val_to_name[i-1]; | |
1136 | if (strcmp(pol_class, def_class)) { | |
1137 | printk(KERN_ERR | |
454d972c | 1138 | "SELinux: class %d is incorrect, found %s but should be %s\n", |
b94c7e67 CS |
1139 | i, pol_class, def_class); |
1140 | return -EINVAL; | |
1141 | } | |
1142 | } | |
1143 | for (i = 0; i < kdefs->av_pts_len; i++) { | |
1144 | class_val = kdefs->av_perm_to_string[i].tclass; | |
1145 | perm_val = kdefs->av_perm_to_string[i].value; | |
1146 | def_perm = kdefs->av_perm_to_string[i].name; | |
1147 | if (class_val > p->p_classes.nprim) | |
1148 | continue; | |
1149 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1150 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1151 | BUG_ON(!cladatum); | |
1152 | perms = &cladatum->permissions; | |
1153 | nprim = 1 << (perms->nprim - 1); | |
1154 | if (perm_val > nprim) { | |
1155 | printk(KERN_INFO | |
454d972c | 1156 | "SELinux: permission %s in class %s not defined in policy\n", |
b94c7e67 | 1157 | def_perm, pol_class); |
3f12070e EP |
1158 | if (p->reject_unknown) |
1159 | return -EINVAL; | |
1160 | if (p->allow_unknown) | |
1161 | p->undefined_perms[class_val-1] |= perm_val; | |
b94c7e67 CS |
1162 | continue; |
1163 | } | |
1164 | perdatum = hashtab_search(perms->table, def_perm); | |
1165 | if (perdatum == NULL) { | |
1166 | printk(KERN_ERR | |
454d972c | 1167 | "SELinux: permission %s in class %s not found in policy, bad policy\n", |
b94c7e67 CS |
1168 | def_perm, pol_class); |
1169 | return -EINVAL; | |
1170 | } | |
1171 | pol_val = 1 << (perdatum->value - 1); | |
1172 | if (pol_val != perm_val) { | |
1173 | printk(KERN_ERR | |
454d972c | 1174 | "SELinux: permission %s in class %s has incorrect value\n", |
b94c7e67 CS |
1175 | def_perm, pol_class); |
1176 | return -EINVAL; | |
1177 | } | |
1178 | } | |
1179 | for (i = 0; i < kdefs->av_inherit_len; i++) { | |
1180 | class_val = kdefs->av_inherit[i].tclass; | |
1181 | if (class_val > p->p_classes.nprim) | |
1182 | continue; | |
1183 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1184 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1185 | BUG_ON(!cladatum); | |
1186 | if (!cladatum->comdatum) { | |
1187 | printk(KERN_ERR | |
454d972c | 1188 | "SELinux: class %s should have an inherits clause but does not\n", |
b94c7e67 CS |
1189 | pol_class); |
1190 | return -EINVAL; | |
1191 | } | |
1192 | tmp = kdefs->av_inherit[i].common_base; | |
1193 | common_pts_len = 0; | |
1194 | while (!(tmp & 0x01)) { | |
1195 | common_pts_len++; | |
1196 | tmp >>= 1; | |
1197 | } | |
1198 | perms = &cladatum->comdatum->permissions; | |
1199 | for (j = 0; j < common_pts_len; j++) { | |
1200 | def_perm = kdefs->av_inherit[i].common_pts[j]; | |
1201 | if (j >= perms->nprim) { | |
1202 | printk(KERN_INFO | |
454d972c | 1203 | "SELinux: permission %s in class %s not defined in policy\n", |
b94c7e67 | 1204 | def_perm, pol_class); |
3f12070e EP |
1205 | if (p->reject_unknown) |
1206 | return -EINVAL; | |
1207 | if (p->allow_unknown) | |
1208 | p->undefined_perms[class_val-1] |= (1 << j); | |
b94c7e67 CS |
1209 | continue; |
1210 | } | |
1211 | perdatum = hashtab_search(perms->table, def_perm); | |
1212 | if (perdatum == NULL) { | |
1213 | printk(KERN_ERR | |
454d972c | 1214 | "SELinux: permission %s in class %s not found in policy, bad policy\n", |
b94c7e67 CS |
1215 | def_perm, pol_class); |
1216 | return -EINVAL; | |
1217 | } | |
1218 | if (perdatum->value != j + 1) { | |
1219 | printk(KERN_ERR | |
454d972c | 1220 | "SELinux: permission %s in class %s has incorrect value\n", |
b94c7e67 CS |
1221 | def_perm, pol_class); |
1222 | return -EINVAL; | |
1223 | } | |
1224 | } | |
1225 | } | |
1226 | return 0; | |
1227 | } | |
1228 | ||
1da177e4 LT |
1229 | /* Clone the SID into the new SID table. */ |
1230 | static int clone_sid(u32 sid, | |
1231 | struct context *context, | |
1232 | void *arg) | |
1233 | { | |
1234 | struct sidtab *s = arg; | |
1235 | ||
1236 | return sidtab_insert(s, sid, context); | |
1237 | } | |
1238 | ||
1239 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1240 | { | |
1241 | int rc = 0; | |
1242 | ||
1243 | if (selinux_enforcing) { | |
1244 | rc = -EINVAL; | |
1245 | } else { | |
1246 | char *s; | |
1247 | u32 len; | |
1248 | ||
1249 | context_struct_to_string(context, &s, &len); | |
454d972c | 1250 | printk(KERN_ERR "SELinux: context %s is invalid\n", s); |
1da177e4 LT |
1251 | kfree(s); |
1252 | } | |
1253 | return rc; | |
1254 | } | |
1255 | ||
1256 | struct convert_context_args { | |
1257 | struct policydb *oldp; | |
1258 | struct policydb *newp; | |
1259 | }; | |
1260 | ||
1261 | /* | |
1262 | * Convert the values in the security context | |
1263 | * structure `c' from the values specified | |
1264 | * in the policy `p->oldp' to the values specified | |
1265 | * in the policy `p->newp'. Verify that the | |
1266 | * context is valid under the new policy. | |
1267 | */ | |
1268 | static int convert_context(u32 key, | |
1269 | struct context *c, | |
1270 | void *p) | |
1271 | { | |
1272 | struct convert_context_args *args; | |
1273 | struct context oldc; | |
1274 | struct role_datum *role; | |
1275 | struct type_datum *typdatum; | |
1276 | struct user_datum *usrdatum; | |
1277 | char *s; | |
1278 | u32 len; | |
1279 | int rc; | |
1280 | ||
1281 | args = p; | |
1282 | ||
1283 | rc = context_cpy(&oldc, c); | |
1284 | if (rc) | |
1285 | goto out; | |
1286 | ||
1287 | rc = -EINVAL; | |
1288 | ||
1289 | /* Convert the user. */ | |
1290 | usrdatum = hashtab_search(args->newp->p_users.table, | |
5d55a345 EP |
1291 | args->oldp->p_user_val_to_name[c->user - 1]); |
1292 | if (!usrdatum) | |
1da177e4 | 1293 | goto bad; |
1da177e4 LT |
1294 | c->user = usrdatum->value; |
1295 | ||
1296 | /* Convert the role. */ | |
1297 | role = hashtab_search(args->newp->p_roles.table, | |
5d55a345 EP |
1298 | args->oldp->p_role_val_to_name[c->role - 1]); |
1299 | if (!role) | |
1da177e4 | 1300 | goto bad; |
1da177e4 LT |
1301 | c->role = role->value; |
1302 | ||
1303 | /* Convert the type. */ | |
1304 | typdatum = hashtab_search(args->newp->p_types.table, | |
5d55a345 EP |
1305 | args->oldp->p_type_val_to_name[c->type - 1]); |
1306 | if (!typdatum) | |
1da177e4 | 1307 | goto bad; |
1da177e4 LT |
1308 | c->type = typdatum->value; |
1309 | ||
1310 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1311 | if (rc) | |
1312 | goto bad; | |
1313 | ||
1314 | /* Check the validity of the new context. */ | |
1315 | if (!policydb_context_isvalid(args->newp, c)) { | |
1316 | rc = convert_context_handle_invalid_context(&oldc); | |
1317 | if (rc) | |
1318 | goto bad; | |
1319 | } | |
1320 | ||
1321 | context_destroy(&oldc); | |
1322 | out: | |
1323 | return rc; | |
1324 | bad: | |
1325 | context_struct_to_string(&oldc, &s, &len); | |
1326 | context_destroy(&oldc); | |
454d972c | 1327 | printk(KERN_ERR "SELinux: invalidating context %s\n", s); |
1da177e4 LT |
1328 | kfree(s); |
1329 | goto out; | |
1330 | } | |
1331 | ||
3bb56b25 PM |
1332 | static void security_load_policycaps(void) |
1333 | { | |
1334 | selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps, | |
1335 | POLICYDB_CAPABILITY_NETPEER); | |
b0c636b9 EP |
1336 | selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps, |
1337 | POLICYDB_CAPABILITY_OPENPERM); | |
3bb56b25 PM |
1338 | } |
1339 | ||
1da177e4 | 1340 | extern void selinux_complete_init(void); |
e900a7d9 | 1341 | static int security_preserve_bools(struct policydb *p); |
1da177e4 LT |
1342 | |
1343 | /** | |
1344 | * security_load_policy - Load a security policy configuration. | |
1345 | * @data: binary policy data | |
1346 | * @len: length of data in bytes | |
1347 | * | |
1348 | * Load a new set of security policy configuration data, | |
1349 | * validate it and convert the SID table as necessary. | |
1350 | * This function will flush the access vector cache after | |
1351 | * loading the new policy. | |
1352 | */ | |
1353 | int security_load_policy(void *data, size_t len) | |
1354 | { | |
1355 | struct policydb oldpolicydb, newpolicydb; | |
1356 | struct sidtab oldsidtab, newsidtab; | |
1357 | struct convert_context_args args; | |
1358 | u32 seqno; | |
1359 | int rc = 0; | |
1360 | struct policy_file file = { data, len }, *fp = &file; | |
1361 | ||
1362 | LOAD_LOCK; | |
1363 | ||
1364 | if (!ss_initialized) { | |
1365 | avtab_cache_init(); | |
1366 | if (policydb_read(&policydb, fp)) { | |
1367 | LOAD_UNLOCK; | |
1368 | avtab_cache_destroy(); | |
1369 | return -EINVAL; | |
1370 | } | |
1371 | if (policydb_load_isids(&policydb, &sidtab)) { | |
1372 | LOAD_UNLOCK; | |
1373 | policydb_destroy(&policydb); | |
1374 | avtab_cache_destroy(); | |
1375 | return -EINVAL; | |
1376 | } | |
b94c7e67 CS |
1377 | /* Verify that the kernel defined classes are correct. */ |
1378 | if (validate_classes(&policydb)) { | |
1379 | printk(KERN_ERR | |
454d972c | 1380 | "SELinux: the definition of a class is incorrect\n"); |
b94c7e67 CS |
1381 | LOAD_UNLOCK; |
1382 | sidtab_destroy(&sidtab); | |
1383 | policydb_destroy(&policydb); | |
1384 | avtab_cache_destroy(); | |
1385 | return -EINVAL; | |
1386 | } | |
3bb56b25 | 1387 | security_load_policycaps(); |
1da177e4 LT |
1388 | policydb_loaded_version = policydb.policyvers; |
1389 | ss_initialized = 1; | |
4c443d1b | 1390 | seqno = ++latest_granting; |
1da177e4 LT |
1391 | LOAD_UNLOCK; |
1392 | selinux_complete_init(); | |
4c443d1b SS |
1393 | avc_ss_reset(seqno); |
1394 | selnl_notify_policyload(seqno); | |
7420ed23 | 1395 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1396 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1397 | return 0; |
1398 | } | |
1399 | ||
1400 | #if 0 | |
1401 | sidtab_hash_eval(&sidtab, "sids"); | |
1402 | #endif | |
1403 | ||
1404 | if (policydb_read(&newpolicydb, fp)) { | |
1405 | LOAD_UNLOCK; | |
1406 | return -EINVAL; | |
1407 | } | |
1408 | ||
1409 | sidtab_init(&newsidtab); | |
1410 | ||
b94c7e67 CS |
1411 | /* Verify that the kernel defined classes are correct. */ |
1412 | if (validate_classes(&newpolicydb)) { | |
1413 | printk(KERN_ERR | |
454d972c | 1414 | "SELinux: the definition of a class is incorrect\n"); |
b94c7e67 CS |
1415 | rc = -EINVAL; |
1416 | goto err; | |
1417 | } | |
1418 | ||
e900a7d9 SS |
1419 | rc = security_preserve_bools(&newpolicydb); |
1420 | if (rc) { | |
454d972c | 1421 | printk(KERN_ERR "SELinux: unable to preserve booleans\n"); |
e900a7d9 SS |
1422 | goto err; |
1423 | } | |
1424 | ||
1da177e4 LT |
1425 | /* Clone the SID table. */ |
1426 | sidtab_shutdown(&sidtab); | |
1427 | if (sidtab_map(&sidtab, clone_sid, &newsidtab)) { | |
1428 | rc = -ENOMEM; | |
1429 | goto err; | |
1430 | } | |
1431 | ||
1432 | /* Convert the internal representations of contexts | |
1433 | in the new SID table and remove invalid SIDs. */ | |
1434 | args.oldp = &policydb; | |
1435 | args.newp = &newpolicydb; | |
1436 | sidtab_map_remove_on_error(&newsidtab, convert_context, &args); | |
1437 | ||
1438 | /* Save the old policydb and SID table to free later. */ | |
1439 | memcpy(&oldpolicydb, &policydb, sizeof policydb); | |
1440 | sidtab_set(&oldsidtab, &sidtab); | |
1441 | ||
1442 | /* Install the new policydb and SID table. */ | |
1443 | POLICY_WRLOCK; | |
1444 | memcpy(&policydb, &newpolicydb, sizeof policydb); | |
1445 | sidtab_set(&sidtab, &newsidtab); | |
3bb56b25 | 1446 | security_load_policycaps(); |
1da177e4 LT |
1447 | seqno = ++latest_granting; |
1448 | policydb_loaded_version = policydb.policyvers; | |
1449 | POLICY_WRUNLOCK; | |
1450 | LOAD_UNLOCK; | |
1451 | ||
1452 | /* Free the old policydb and SID table. */ | |
1453 | policydb_destroy(&oldpolicydb); | |
1454 | sidtab_destroy(&oldsidtab); | |
1455 | ||
1456 | avc_ss_reset(seqno); | |
1457 | selnl_notify_policyload(seqno); | |
7420ed23 | 1458 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1459 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1460 | |
1461 | return 0; | |
1462 | ||
1463 | err: | |
1464 | LOAD_UNLOCK; | |
1465 | sidtab_destroy(&newsidtab); | |
1466 | policydb_destroy(&newpolicydb); | |
1467 | return rc; | |
1468 | ||
1469 | } | |
1470 | ||
1471 | /** | |
1472 | * security_port_sid - Obtain the SID for a port. | |
1da177e4 LT |
1473 | * @protocol: protocol number |
1474 | * @port: port number | |
1475 | * @out_sid: security identifier | |
1476 | */ | |
3e112172 | 1477 | int security_port_sid(u8 protocol, u16 port, u32 *out_sid) |
1da177e4 LT |
1478 | { |
1479 | struct ocontext *c; | |
1480 | int rc = 0; | |
1481 | ||
1482 | POLICY_RDLOCK; | |
1483 | ||
1484 | c = policydb.ocontexts[OCON_PORT]; | |
1485 | while (c) { | |
1486 | if (c->u.port.protocol == protocol && | |
1487 | c->u.port.low_port <= port && | |
1488 | c->u.port.high_port >= port) | |
1489 | break; | |
1490 | c = c->next; | |
1491 | } | |
1492 | ||
1493 | if (c) { | |
1494 | if (!c->sid[0]) { | |
1495 | rc = sidtab_context_to_sid(&sidtab, | |
1496 | &c->context[0], | |
1497 | &c->sid[0]); | |
1498 | if (rc) | |
1499 | goto out; | |
1500 | } | |
1501 | *out_sid = c->sid[0]; | |
1502 | } else { | |
1503 | *out_sid = SECINITSID_PORT; | |
1504 | } | |
1505 | ||
1506 | out: | |
1507 | POLICY_RDUNLOCK; | |
1508 | return rc; | |
1509 | } | |
1510 | ||
1511 | /** | |
1512 | * security_netif_sid - Obtain the SID for a network interface. | |
1513 | * @name: interface name | |
1514 | * @if_sid: interface SID | |
1da177e4 | 1515 | */ |
e8bfdb9d | 1516 | int security_netif_sid(char *name, u32 *if_sid) |
1da177e4 LT |
1517 | { |
1518 | int rc = 0; | |
1519 | struct ocontext *c; | |
1520 | ||
1521 | POLICY_RDLOCK; | |
1522 | ||
1523 | c = policydb.ocontexts[OCON_NETIF]; | |
1524 | while (c) { | |
1525 | if (strcmp(name, c->u.name) == 0) | |
1526 | break; | |
1527 | c = c->next; | |
1528 | } | |
1529 | ||
1530 | if (c) { | |
1531 | if (!c->sid[0] || !c->sid[1]) { | |
1532 | rc = sidtab_context_to_sid(&sidtab, | |
1533 | &c->context[0], | |
1534 | &c->sid[0]); | |
1535 | if (rc) | |
1536 | goto out; | |
1537 | rc = sidtab_context_to_sid(&sidtab, | |
1538 | &c->context[1], | |
1539 | &c->sid[1]); | |
1540 | if (rc) | |
1541 | goto out; | |
1542 | } | |
1543 | *if_sid = c->sid[0]; | |
e8bfdb9d | 1544 | } else |
1da177e4 | 1545 | *if_sid = SECINITSID_NETIF; |
1da177e4 LT |
1546 | |
1547 | out: | |
1548 | POLICY_RDUNLOCK; | |
1549 | return rc; | |
1550 | } | |
1551 | ||
1552 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
1553 | { | |
1554 | int i, fail = 0; | |
1555 | ||
5d55a345 EP |
1556 | for (i = 0; i < 4; i++) |
1557 | if (addr[i] != (input[i] & mask[i])) { | |
1da177e4 LT |
1558 | fail = 1; |
1559 | break; | |
1560 | } | |
1561 | ||
1562 | return !fail; | |
1563 | } | |
1564 | ||
1565 | /** | |
1566 | * security_node_sid - Obtain the SID for a node (host). | |
1567 | * @domain: communication domain aka address family | |
1568 | * @addrp: address | |
1569 | * @addrlen: address length in bytes | |
1570 | * @out_sid: security identifier | |
1571 | */ | |
1572 | int security_node_sid(u16 domain, | |
1573 | void *addrp, | |
1574 | u32 addrlen, | |
1575 | u32 *out_sid) | |
1576 | { | |
1577 | int rc = 0; | |
1578 | struct ocontext *c; | |
1579 | ||
1580 | POLICY_RDLOCK; | |
1581 | ||
1582 | switch (domain) { | |
1583 | case AF_INET: { | |
1584 | u32 addr; | |
1585 | ||
1586 | if (addrlen != sizeof(u32)) { | |
1587 | rc = -EINVAL; | |
1588 | goto out; | |
1589 | } | |
1590 | ||
1591 | addr = *((u32 *)addrp); | |
1592 | ||
1593 | c = policydb.ocontexts[OCON_NODE]; | |
1594 | while (c) { | |
1595 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
1596 | break; | |
1597 | c = c->next; | |
1598 | } | |
1599 | break; | |
1600 | } | |
1601 | ||
1602 | case AF_INET6: | |
1603 | if (addrlen != sizeof(u64) * 2) { | |
1604 | rc = -EINVAL; | |
1605 | goto out; | |
1606 | } | |
1607 | c = policydb.ocontexts[OCON_NODE6]; | |
1608 | while (c) { | |
1609 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
1610 | c->u.node6.mask)) | |
1611 | break; | |
1612 | c = c->next; | |
1613 | } | |
1614 | break; | |
1615 | ||
1616 | default: | |
1617 | *out_sid = SECINITSID_NODE; | |
1618 | goto out; | |
1619 | } | |
1620 | ||
1621 | if (c) { | |
1622 | if (!c->sid[0]) { | |
1623 | rc = sidtab_context_to_sid(&sidtab, | |
1624 | &c->context[0], | |
1625 | &c->sid[0]); | |
1626 | if (rc) | |
1627 | goto out; | |
1628 | } | |
1629 | *out_sid = c->sid[0]; | |
1630 | } else { | |
1631 | *out_sid = SECINITSID_NODE; | |
1632 | } | |
1633 | ||
1634 | out: | |
1635 | POLICY_RDUNLOCK; | |
1636 | return rc; | |
1637 | } | |
1638 | ||
1639 | #define SIDS_NEL 25 | |
1640 | ||
1641 | /** | |
1642 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
1643 | * @fromsid: starting SID | |
1644 | * @username: username | |
1645 | * @sids: array of reachable SIDs for user | |
1646 | * @nel: number of elements in @sids | |
1647 | * | |
1648 | * Generate the set of SIDs for legal security contexts | |
1649 | * for a given user that can be reached by @fromsid. | |
1650 | * Set *@sids to point to a dynamically allocated | |
1651 | * array containing the set of SIDs. Set *@nel to the | |
1652 | * number of elements in the array. | |
1653 | */ | |
1654 | ||
1655 | int security_get_user_sids(u32 fromsid, | |
5d55a345 | 1656 | char *username, |
1da177e4 LT |
1657 | u32 **sids, |
1658 | u32 *nel) | |
1659 | { | |
1660 | struct context *fromcon, usercon; | |
2c3c05db | 1661 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
1662 | u32 mynel = 0, maxnel = SIDS_NEL; |
1663 | struct user_datum *user; | |
1664 | struct role_datum *role; | |
782ebb99 | 1665 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
1666 | int rc = 0, i, j; |
1667 | ||
2c3c05db SS |
1668 | *sids = NULL; |
1669 | *nel = 0; | |
1670 | ||
1671 | if (!ss_initialized) | |
1da177e4 | 1672 | goto out; |
1da177e4 LT |
1673 | |
1674 | POLICY_RDLOCK; | |
1675 | ||
1676 | fromcon = sidtab_search(&sidtab, fromsid); | |
1677 | if (!fromcon) { | |
1678 | rc = -EINVAL; | |
1679 | goto out_unlock; | |
1680 | } | |
1681 | ||
1682 | user = hashtab_search(policydb.p_users.table, username); | |
1683 | if (!user) { | |
1684 | rc = -EINVAL; | |
1685 | goto out_unlock; | |
1686 | } | |
1687 | usercon.user = user->value; | |
1688 | ||
89d155ef | 1689 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
1da177e4 LT |
1690 | if (!mysids) { |
1691 | rc = -ENOMEM; | |
1692 | goto out_unlock; | |
1693 | } | |
1da177e4 | 1694 | |
9fe79ad1 | 1695 | ebitmap_for_each_positive_bit(&user->roles, rnode, i) { |
1da177e4 LT |
1696 | role = policydb.role_val_to_struct[i]; |
1697 | usercon.role = i+1; | |
9fe79ad1 | 1698 | ebitmap_for_each_positive_bit(&role->types, tnode, j) { |
1da177e4 LT |
1699 | usercon.type = j+1; |
1700 | ||
1701 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
1702 | continue; | |
1703 | ||
1da177e4 | 1704 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
2c3c05db | 1705 | if (rc) |
1da177e4 | 1706 | goto out_unlock; |
1da177e4 LT |
1707 | if (mynel < maxnel) { |
1708 | mysids[mynel++] = sid; | |
1709 | } else { | |
1710 | maxnel += SIDS_NEL; | |
89d155ef | 1711 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
1da177e4 LT |
1712 | if (!mysids2) { |
1713 | rc = -ENOMEM; | |
1da177e4 LT |
1714 | goto out_unlock; |
1715 | } | |
1da177e4 LT |
1716 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
1717 | kfree(mysids); | |
1718 | mysids = mysids2; | |
1719 | mysids[mynel++] = sid; | |
1720 | } | |
1721 | } | |
1722 | } | |
1723 | ||
1da177e4 LT |
1724 | out_unlock: |
1725 | POLICY_RDUNLOCK; | |
2c3c05db SS |
1726 | if (rc || !mynel) { |
1727 | kfree(mysids); | |
1728 | goto out; | |
1729 | } | |
1730 | ||
1731 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); | |
1732 | if (!mysids2) { | |
1733 | rc = -ENOMEM; | |
1734 | kfree(mysids); | |
1735 | goto out; | |
1736 | } | |
1737 | for (i = 0, j = 0; i < mynel; i++) { | |
1738 | rc = avc_has_perm_noaudit(fromsid, mysids[i], | |
1739 | SECCLASS_PROCESS, | |
1740 | PROCESS__TRANSITION, AVC_STRICT, | |
1741 | NULL); | |
1742 | if (!rc) | |
1743 | mysids2[j++] = mysids[i]; | |
1744 | cond_resched(); | |
1745 | } | |
1746 | rc = 0; | |
1747 | kfree(mysids); | |
1748 | *sids = mysids2; | |
1749 | *nel = j; | |
1da177e4 LT |
1750 | out: |
1751 | return rc; | |
1752 | } | |
1753 | ||
1754 | /** | |
1755 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
1756 | * @fstype: filesystem type | |
1757 | * @path: path from root of mount | |
1758 | * @sclass: file security class | |
1759 | * @sid: SID for path | |
1760 | * | |
1761 | * Obtain a SID to use for a file in a filesystem that | |
1762 | * cannot support xattr or use a fixed labeling behavior like | |
1763 | * transition SIDs or task SIDs. | |
1764 | */ | |
1765 | int security_genfs_sid(const char *fstype, | |
5d55a345 | 1766 | char *path, |
1da177e4 LT |
1767 | u16 sclass, |
1768 | u32 *sid) | |
1769 | { | |
1770 | int len; | |
1771 | struct genfs *genfs; | |
1772 | struct ocontext *c; | |
1773 | int rc = 0, cmp = 0; | |
1774 | ||
b1aa5301 SS |
1775 | while (path[0] == '/' && path[1] == '/') |
1776 | path++; | |
1777 | ||
1da177e4 LT |
1778 | POLICY_RDLOCK; |
1779 | ||
1780 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { | |
1781 | cmp = strcmp(fstype, genfs->fstype); | |
1782 | if (cmp <= 0) | |
1783 | break; | |
1784 | } | |
1785 | ||
1786 | if (!genfs || cmp) { | |
1787 | *sid = SECINITSID_UNLABELED; | |
1788 | rc = -ENOENT; | |
1789 | goto out; | |
1790 | } | |
1791 | ||
1792 | for (c = genfs->head; c; c = c->next) { | |
1793 | len = strlen(c->u.name); | |
1794 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
1795 | (strncmp(c->u.name, path, len) == 0)) | |
1796 | break; | |
1797 | } | |
1798 | ||
1799 | if (!c) { | |
1800 | *sid = SECINITSID_UNLABELED; | |
1801 | rc = -ENOENT; | |
1802 | goto out; | |
1803 | } | |
1804 | ||
1805 | if (!c->sid[0]) { | |
1806 | rc = sidtab_context_to_sid(&sidtab, | |
1807 | &c->context[0], | |
1808 | &c->sid[0]); | |
1809 | if (rc) | |
1810 | goto out; | |
1811 | } | |
1812 | ||
1813 | *sid = c->sid[0]; | |
1814 | out: | |
1815 | POLICY_RDUNLOCK; | |
1816 | return rc; | |
1817 | } | |
1818 | ||
1819 | /** | |
1820 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
1821 | * @fstype: filesystem type | |
1822 | * @behavior: labeling behavior | |
1823 | * @sid: SID for filesystem (superblock) | |
1824 | */ | |
1825 | int security_fs_use( | |
1826 | const char *fstype, | |
1827 | unsigned int *behavior, | |
1828 | u32 *sid) | |
1829 | { | |
1830 | int rc = 0; | |
1831 | struct ocontext *c; | |
1832 | ||
1833 | POLICY_RDLOCK; | |
1834 | ||
1835 | c = policydb.ocontexts[OCON_FSUSE]; | |
1836 | while (c) { | |
1837 | if (strcmp(fstype, c->u.name) == 0) | |
1838 | break; | |
1839 | c = c->next; | |
1840 | } | |
1841 | ||
1842 | if (c) { | |
1843 | *behavior = c->v.behavior; | |
1844 | if (!c->sid[0]) { | |
1845 | rc = sidtab_context_to_sid(&sidtab, | |
1846 | &c->context[0], | |
1847 | &c->sid[0]); | |
1848 | if (rc) | |
1849 | goto out; | |
1850 | } | |
1851 | *sid = c->sid[0]; | |
1852 | } else { | |
1853 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); | |
1854 | if (rc) { | |
1855 | *behavior = SECURITY_FS_USE_NONE; | |
1856 | rc = 0; | |
1857 | } else { | |
1858 | *behavior = SECURITY_FS_USE_GENFS; | |
1859 | } | |
1860 | } | |
1861 | ||
1862 | out: | |
1863 | POLICY_RDUNLOCK; | |
1864 | return rc; | |
1865 | } | |
1866 | ||
1867 | int security_get_bools(int *len, char ***names, int **values) | |
1868 | { | |
1869 | int i, rc = -ENOMEM; | |
1870 | ||
1871 | POLICY_RDLOCK; | |
1872 | *names = NULL; | |
1873 | *values = NULL; | |
1874 | ||
1875 | *len = policydb.p_bools.nprim; | |
1876 | if (!*len) { | |
1877 | rc = 0; | |
1878 | goto out; | |
1879 | } | |
1880 | ||
5d55a345 | 1881 | *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); |
1da177e4 LT |
1882 | if (!*names) |
1883 | goto err; | |
1da177e4 | 1884 | |
e0795cf4 | 1885 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); |
1da177e4 LT |
1886 | if (!*values) |
1887 | goto err; | |
1888 | ||
1889 | for (i = 0; i < *len; i++) { | |
1890 | size_t name_len; | |
1891 | (*values)[i] = policydb.bool_val_to_struct[i]->state; | |
1892 | name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; | |
5d55a345 | 1893 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); |
1da177e4 LT |
1894 | if (!(*names)[i]) |
1895 | goto err; | |
1896 | strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); | |
1897 | (*names)[i][name_len - 1] = 0; | |
1898 | } | |
1899 | rc = 0; | |
1900 | out: | |
1901 | POLICY_RDUNLOCK; | |
1902 | return rc; | |
1903 | err: | |
1904 | if (*names) { | |
1905 | for (i = 0; i < *len; i++) | |
9a5f04bf | 1906 | kfree((*names)[i]); |
1da177e4 | 1907 | } |
9a5f04bf | 1908 | kfree(*values); |
1da177e4 LT |
1909 | goto out; |
1910 | } | |
1911 | ||
1912 | ||
1913 | int security_set_bools(int len, int *values) | |
1914 | { | |
1915 | int i, rc = 0; | |
1916 | int lenp, seqno = 0; | |
1917 | struct cond_node *cur; | |
1918 | ||
1919 | POLICY_WRLOCK; | |
1920 | ||
1921 | lenp = policydb.p_bools.nprim; | |
1922 | if (len != lenp) { | |
1923 | rc = -EFAULT; | |
1924 | goto out; | |
1925 | } | |
1926 | ||
1da177e4 | 1927 | for (i = 0; i < len; i++) { |
af601e46 SG |
1928 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
1929 | audit_log(current->audit_context, GFP_ATOMIC, | |
1930 | AUDIT_MAC_CONFIG_CHANGE, | |
4746ec5b | 1931 | "bool=%s val=%d old_val=%d auid=%u ses=%u", |
af601e46 SG |
1932 | policydb.p_bool_val_to_name[i], |
1933 | !!values[i], | |
1934 | policydb.bool_val_to_struct[i]->state, | |
4746ec5b EP |
1935 | audit_get_loginuid(current), |
1936 | audit_get_sessionid(current)); | |
af601e46 | 1937 | } |
5d55a345 | 1938 | if (values[i]) |
1da177e4 | 1939 | policydb.bool_val_to_struct[i]->state = 1; |
5d55a345 | 1940 | else |
1da177e4 | 1941 | policydb.bool_val_to_struct[i]->state = 0; |
1da177e4 | 1942 | } |
1da177e4 LT |
1943 | |
1944 | for (cur = policydb.cond_list; cur != NULL; cur = cur->next) { | |
1945 | rc = evaluate_cond_node(&policydb, cur); | |
1946 | if (rc) | |
1947 | goto out; | |
1948 | } | |
1949 | ||
1950 | seqno = ++latest_granting; | |
1951 | ||
1952 | out: | |
1953 | POLICY_WRUNLOCK; | |
1954 | if (!rc) { | |
1955 | avc_ss_reset(seqno); | |
1956 | selnl_notify_policyload(seqno); | |
342a0cff | 1957 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1958 | } |
1959 | return rc; | |
1960 | } | |
1961 | ||
1962 | int security_get_bool_value(int bool) | |
1963 | { | |
1964 | int rc = 0; | |
1965 | int len; | |
1966 | ||
1967 | POLICY_RDLOCK; | |
1968 | ||
1969 | len = policydb.p_bools.nprim; | |
1970 | if (bool >= len) { | |
1971 | rc = -EFAULT; | |
1972 | goto out; | |
1973 | } | |
1974 | ||
1975 | rc = policydb.bool_val_to_struct[bool]->state; | |
1976 | out: | |
1977 | POLICY_RDUNLOCK; | |
1978 | return rc; | |
1979 | } | |
376bd9cb | 1980 | |
e900a7d9 SS |
1981 | static int security_preserve_bools(struct policydb *p) |
1982 | { | |
1983 | int rc, nbools = 0, *bvalues = NULL, i; | |
1984 | char **bnames = NULL; | |
1985 | struct cond_bool_datum *booldatum; | |
1986 | struct cond_node *cur; | |
1987 | ||
1988 | rc = security_get_bools(&nbools, &bnames, &bvalues); | |
1989 | if (rc) | |
1990 | goto out; | |
1991 | for (i = 0; i < nbools; i++) { | |
1992 | booldatum = hashtab_search(p->p_bools.table, bnames[i]); | |
1993 | if (booldatum) | |
1994 | booldatum->state = bvalues[i]; | |
1995 | } | |
1996 | for (cur = p->cond_list; cur != NULL; cur = cur->next) { | |
1997 | rc = evaluate_cond_node(p, cur); | |
1998 | if (rc) | |
1999 | goto out; | |
2000 | } | |
2001 | ||
2002 | out: | |
2003 | if (bnames) { | |
2004 | for (i = 0; i < nbools; i++) | |
2005 | kfree(bnames[i]); | |
2006 | } | |
2007 | kfree(bnames); | |
2008 | kfree(bvalues); | |
2009 | return rc; | |
2010 | } | |
2011 | ||
08554d6b VY |
2012 | /* |
2013 | * security_sid_mls_copy() - computes a new sid based on the given | |
2014 | * sid and the mls portion of mls_sid. | |
2015 | */ | |
2016 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
2017 | { | |
2018 | struct context *context1; | |
2019 | struct context *context2; | |
2020 | struct context newcon; | |
2021 | char *s; | |
2022 | u32 len; | |
2023 | int rc = 0; | |
2024 | ||
4eb327b5 | 2025 | if (!ss_initialized || !selinux_mls_enabled) { |
08554d6b VY |
2026 | *new_sid = sid; |
2027 | goto out; | |
2028 | } | |
2029 | ||
2030 | context_init(&newcon); | |
2031 | ||
2032 | POLICY_RDLOCK; | |
2033 | context1 = sidtab_search(&sidtab, sid); | |
2034 | if (!context1) { | |
744ba35e EP |
2035 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2036 | __func__, sid); | |
08554d6b VY |
2037 | rc = -EINVAL; |
2038 | goto out_unlock; | |
2039 | } | |
2040 | ||
2041 | context2 = sidtab_search(&sidtab, mls_sid); | |
2042 | if (!context2) { | |
744ba35e EP |
2043 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2044 | __func__, mls_sid); | |
08554d6b VY |
2045 | rc = -EINVAL; |
2046 | goto out_unlock; | |
2047 | } | |
2048 | ||
2049 | newcon.user = context1->user; | |
2050 | newcon.role = context1->role; | |
2051 | newcon.type = context1->type; | |
0efc61ea | 2052 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
2053 | if (rc) |
2054 | goto out_unlock; | |
2055 | ||
08554d6b VY |
2056 | /* Check the validity of the new context. */ |
2057 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
2058 | rc = convert_context_handle_invalid_context(&newcon); | |
2059 | if (rc) | |
2060 | goto bad; | |
2061 | } | |
2062 | ||
2063 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
2064 | goto out_unlock; | |
2065 | ||
2066 | bad: | |
2067 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
2068 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2069 | "security_sid_mls_copy: invalid context %s", s); | |
2070 | kfree(s); | |
2071 | } | |
2072 | ||
2073 | out_unlock: | |
2074 | POLICY_RDUNLOCK; | |
2075 | context_destroy(&newcon); | |
2076 | out: | |
2077 | return rc; | |
2078 | } | |
2079 | ||
220deb96 PM |
2080 | /** |
2081 | * security_net_peersid_resolve - Compare and resolve two network peer SIDs | |
2082 | * @nlbl_sid: NetLabel SID | |
2083 | * @nlbl_type: NetLabel labeling protocol type | |
2084 | * @xfrm_sid: XFRM SID | |
2085 | * | |
2086 | * Description: | |
2087 | * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be | |
2088 | * resolved into a single SID it is returned via @peer_sid and the function | |
2089 | * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function | |
2090 | * returns a negative value. A table summarizing the behavior is below: | |
2091 | * | |
2092 | * | function return | @sid | |
2093 | * ------------------------------+-----------------+----------------- | |
2094 | * no peer labels | 0 | SECSID_NULL | |
2095 | * single peer label | 0 | <peer_label> | |
2096 | * multiple, consistent labels | 0 | <peer_label> | |
2097 | * multiple, inconsistent labels | -<errno> | SECSID_NULL | |
2098 | * | |
2099 | */ | |
2100 | int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, | |
2101 | u32 xfrm_sid, | |
2102 | u32 *peer_sid) | |
2103 | { | |
2104 | int rc; | |
2105 | struct context *nlbl_ctx; | |
2106 | struct context *xfrm_ctx; | |
2107 | ||
2108 | /* handle the common (which also happens to be the set of easy) cases | |
2109 | * right away, these two if statements catch everything involving a | |
2110 | * single or absent peer SID/label */ | |
2111 | if (xfrm_sid == SECSID_NULL) { | |
2112 | *peer_sid = nlbl_sid; | |
2113 | return 0; | |
2114 | } | |
2115 | /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label | |
2116 | * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label | |
2117 | * is present */ | |
2118 | if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { | |
2119 | *peer_sid = xfrm_sid; | |
2120 | return 0; | |
2121 | } | |
2122 | ||
2123 | /* we don't need to check ss_initialized here since the only way both | |
2124 | * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the | |
2125 | * security server was initialized and ss_initialized was true */ | |
2126 | if (!selinux_mls_enabled) { | |
2127 | *peer_sid = SECSID_NULL; | |
2128 | return 0; | |
2129 | } | |
2130 | ||
2131 | POLICY_RDLOCK; | |
2132 | ||
2133 | nlbl_ctx = sidtab_search(&sidtab, nlbl_sid); | |
2134 | if (!nlbl_ctx) { | |
744ba35e EP |
2135 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2136 | __func__, nlbl_sid); | |
220deb96 PM |
2137 | rc = -EINVAL; |
2138 | goto out_slowpath; | |
2139 | } | |
2140 | xfrm_ctx = sidtab_search(&sidtab, xfrm_sid); | |
2141 | if (!xfrm_ctx) { | |
744ba35e EP |
2142 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2143 | __func__, xfrm_sid); | |
220deb96 PM |
2144 | rc = -EINVAL; |
2145 | goto out_slowpath; | |
2146 | } | |
2147 | rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); | |
2148 | ||
2149 | out_slowpath: | |
2150 | POLICY_RDUNLOCK; | |
2151 | if (rc == 0) | |
2152 | /* at present NetLabel SIDs/labels really only carry MLS | |
2153 | * information so if the MLS portion of the NetLabel SID | |
2154 | * matches the MLS portion of the labeled XFRM SID/label | |
2155 | * then pass along the XFRM SID as it is the most | |
2156 | * expressive */ | |
2157 | *peer_sid = xfrm_sid; | |
2158 | else | |
2159 | *peer_sid = SECSID_NULL; | |
2160 | return rc; | |
2161 | } | |
2162 | ||
55fcf09b CP |
2163 | static int get_classes_callback(void *k, void *d, void *args) |
2164 | { | |
2165 | struct class_datum *datum = d; | |
2166 | char *name = k, **classes = args; | |
2167 | int value = datum->value - 1; | |
2168 | ||
2169 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
2170 | if (!classes[value]) | |
2171 | return -ENOMEM; | |
2172 | ||
2173 | return 0; | |
2174 | } | |
2175 | ||
2176 | int security_get_classes(char ***classes, int *nclasses) | |
2177 | { | |
2178 | int rc = -ENOMEM; | |
2179 | ||
2180 | POLICY_RDLOCK; | |
2181 | ||
2182 | *nclasses = policydb.p_classes.nprim; | |
2183 | *classes = kcalloc(*nclasses, sizeof(*classes), GFP_ATOMIC); | |
2184 | if (!*classes) | |
2185 | goto out; | |
2186 | ||
2187 | rc = hashtab_map(policydb.p_classes.table, get_classes_callback, | |
2188 | *classes); | |
2189 | if (rc < 0) { | |
2190 | int i; | |
2191 | for (i = 0; i < *nclasses; i++) | |
2192 | kfree((*classes)[i]); | |
2193 | kfree(*classes); | |
2194 | } | |
2195 | ||
2196 | out: | |
2197 | POLICY_RDUNLOCK; | |
2198 | return rc; | |
2199 | } | |
2200 | ||
2201 | static int get_permissions_callback(void *k, void *d, void *args) | |
2202 | { | |
2203 | struct perm_datum *datum = d; | |
2204 | char *name = k, **perms = args; | |
2205 | int value = datum->value - 1; | |
2206 | ||
2207 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
2208 | if (!perms[value]) | |
2209 | return -ENOMEM; | |
2210 | ||
2211 | return 0; | |
2212 | } | |
2213 | ||
2214 | int security_get_permissions(char *class, char ***perms, int *nperms) | |
2215 | { | |
2216 | int rc = -ENOMEM, i; | |
2217 | struct class_datum *match; | |
2218 | ||
2219 | POLICY_RDLOCK; | |
2220 | ||
2221 | match = hashtab_search(policydb.p_classes.table, class); | |
2222 | if (!match) { | |
744ba35e | 2223 | printk(KERN_ERR "SELinux: %s: unrecognized class %s\n", |
dd6f953a | 2224 | __func__, class); |
55fcf09b CP |
2225 | rc = -EINVAL; |
2226 | goto out; | |
2227 | } | |
2228 | ||
2229 | *nperms = match->permissions.nprim; | |
2230 | *perms = kcalloc(*nperms, sizeof(*perms), GFP_ATOMIC); | |
2231 | if (!*perms) | |
2232 | goto out; | |
2233 | ||
2234 | if (match->comdatum) { | |
2235 | rc = hashtab_map(match->comdatum->permissions.table, | |
2236 | get_permissions_callback, *perms); | |
2237 | if (rc < 0) | |
2238 | goto err; | |
2239 | } | |
2240 | ||
2241 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
2242 | *perms); | |
2243 | if (rc < 0) | |
2244 | goto err; | |
2245 | ||
2246 | out: | |
2247 | POLICY_RDUNLOCK; | |
2248 | return rc; | |
2249 | ||
2250 | err: | |
2251 | POLICY_RDUNLOCK; | |
2252 | for (i = 0; i < *nperms; i++) | |
2253 | kfree((*perms)[i]); | |
2254 | kfree(*perms); | |
2255 | return rc; | |
2256 | } | |
2257 | ||
3f12070e EP |
2258 | int security_get_reject_unknown(void) |
2259 | { | |
2260 | return policydb.reject_unknown; | |
2261 | } | |
2262 | ||
2263 | int security_get_allow_unknown(void) | |
2264 | { | |
2265 | return policydb.allow_unknown; | |
2266 | } | |
2267 | ||
3bb56b25 PM |
2268 | /** |
2269 | * security_policycap_supported - Check for a specific policy capability | |
2270 | * @req_cap: capability | |
2271 | * | |
2272 | * Description: | |
2273 | * This function queries the currently loaded policy to see if it supports the | |
2274 | * capability specified by @req_cap. Returns true (1) if the capability is | |
2275 | * supported, false (0) if it isn't supported. | |
2276 | * | |
2277 | */ | |
2278 | int security_policycap_supported(unsigned int req_cap) | |
2279 | { | |
2280 | int rc; | |
2281 | ||
2282 | POLICY_RDLOCK; | |
2283 | rc = ebitmap_get_bit(&policydb.policycaps, req_cap); | |
2284 | POLICY_RDUNLOCK; | |
2285 | ||
2286 | return rc; | |
2287 | } | |
2288 | ||
376bd9cb DG |
2289 | struct selinux_audit_rule { |
2290 | u32 au_seqno; | |
2291 | struct context au_ctxt; | |
2292 | }; | |
2293 | ||
9d57a7f9 | 2294 | void selinux_audit_rule_free(void *vrule) |
376bd9cb | 2295 | { |
9d57a7f9 AD |
2296 | struct selinux_audit_rule *rule = vrule; |
2297 | ||
376bd9cb DG |
2298 | if (rule) { |
2299 | context_destroy(&rule->au_ctxt); | |
2300 | kfree(rule); | |
2301 | } | |
2302 | } | |
2303 | ||
9d57a7f9 | 2304 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) |
376bd9cb DG |
2305 | { |
2306 | struct selinux_audit_rule *tmprule; | |
2307 | struct role_datum *roledatum; | |
2308 | struct type_datum *typedatum; | |
2309 | struct user_datum *userdatum; | |
9d57a7f9 | 2310 | struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule; |
376bd9cb DG |
2311 | int rc = 0; |
2312 | ||
2313 | *rule = NULL; | |
2314 | ||
2315 | if (!ss_initialized) | |
3ad40d64 | 2316 | return -EOPNOTSUPP; |
376bd9cb DG |
2317 | |
2318 | switch (field) { | |
3a6b9f85 DG |
2319 | case AUDIT_SUBJ_USER: |
2320 | case AUDIT_SUBJ_ROLE: | |
2321 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
2322 | case AUDIT_OBJ_USER: |
2323 | case AUDIT_OBJ_ROLE: | |
2324 | case AUDIT_OBJ_TYPE: | |
376bd9cb DG |
2325 | /* only 'equals' and 'not equals' fit user, role, and type */ |
2326 | if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL) | |
2327 | return -EINVAL; | |
2328 | break; | |
3a6b9f85 DG |
2329 | case AUDIT_SUBJ_SEN: |
2330 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2331 | case AUDIT_OBJ_LEV_LOW: |
2332 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2333 | /* we do not allow a range, indicated by the presense of '-' */ |
2334 | if (strchr(rulestr, '-')) | |
2335 | return -EINVAL; | |
2336 | break; | |
2337 | default: | |
2338 | /* only the above fields are valid */ | |
2339 | return -EINVAL; | |
2340 | } | |
2341 | ||
2342 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
2343 | if (!tmprule) | |
2344 | return -ENOMEM; | |
2345 | ||
2346 | context_init(&tmprule->au_ctxt); | |
2347 | ||
2348 | POLICY_RDLOCK; | |
2349 | ||
2350 | tmprule->au_seqno = latest_granting; | |
2351 | ||
2352 | switch (field) { | |
3a6b9f85 | 2353 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2354 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2355 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
2356 | if (!userdatum) | |
2357 | rc = -EINVAL; | |
2358 | else | |
2359 | tmprule->au_ctxt.user = userdatum->value; | |
2360 | break; | |
3a6b9f85 | 2361 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2362 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2363 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
2364 | if (!roledatum) | |
2365 | rc = -EINVAL; | |
2366 | else | |
2367 | tmprule->au_ctxt.role = roledatum->value; | |
2368 | break; | |
3a6b9f85 | 2369 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2370 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2371 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
2372 | if (!typedatum) | |
2373 | rc = -EINVAL; | |
2374 | else | |
2375 | tmprule->au_ctxt.type = typedatum->value; | |
2376 | break; | |
3a6b9f85 DG |
2377 | case AUDIT_SUBJ_SEN: |
2378 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2379 | case AUDIT_OBJ_LEV_LOW: |
2380 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2381 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
2382 | break; | |
2383 | } | |
2384 | ||
2385 | POLICY_RDUNLOCK; | |
2386 | ||
2387 | if (rc) { | |
2388 | selinux_audit_rule_free(tmprule); | |
2389 | tmprule = NULL; | |
2390 | } | |
2391 | ||
2392 | *rule = tmprule; | |
2393 | ||
2394 | return rc; | |
2395 | } | |
2396 | ||
9d57a7f9 AD |
2397 | /* Check to see if the rule contains any selinux fields */ |
2398 | int selinux_audit_rule_known(struct audit_krule *rule) | |
2399 | { | |
2400 | int i; | |
2401 | ||
2402 | for (i = 0; i < rule->field_count; i++) { | |
2403 | struct audit_field *f = &rule->fields[i]; | |
2404 | switch (f->type) { | |
2405 | case AUDIT_SUBJ_USER: | |
2406 | case AUDIT_SUBJ_ROLE: | |
2407 | case AUDIT_SUBJ_TYPE: | |
2408 | case AUDIT_SUBJ_SEN: | |
2409 | case AUDIT_SUBJ_CLR: | |
2410 | case AUDIT_OBJ_USER: | |
2411 | case AUDIT_OBJ_ROLE: | |
2412 | case AUDIT_OBJ_TYPE: | |
2413 | case AUDIT_OBJ_LEV_LOW: | |
2414 | case AUDIT_OBJ_LEV_HIGH: | |
2415 | return 1; | |
2416 | } | |
2417 | } | |
2418 | ||
2419 | return 0; | |
2420 | } | |
2421 | ||
2422 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, | |
376bd9cb DG |
2423 | struct audit_context *actx) |
2424 | { | |
2425 | struct context *ctxt; | |
2426 | struct mls_level *level; | |
9d57a7f9 | 2427 | struct selinux_audit_rule *rule = vrule; |
376bd9cb DG |
2428 | int match = 0; |
2429 | ||
2430 | if (!rule) { | |
2431 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2432 | "selinux_audit_rule_match: missing rule\n"); |
376bd9cb DG |
2433 | return -ENOENT; |
2434 | } | |
2435 | ||
2436 | POLICY_RDLOCK; | |
2437 | ||
2438 | if (rule->au_seqno < latest_granting) { | |
2439 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2440 | "selinux_audit_rule_match: stale rule\n"); |
376bd9cb DG |
2441 | match = -ESTALE; |
2442 | goto out; | |
2443 | } | |
2444 | ||
9a2f44f0 | 2445 | ctxt = sidtab_search(&sidtab, sid); |
376bd9cb DG |
2446 | if (!ctxt) { |
2447 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 EP |
2448 | "selinux_audit_rule_match: unrecognized SID %d\n", |
2449 | sid); | |
376bd9cb DG |
2450 | match = -ENOENT; |
2451 | goto out; | |
2452 | } | |
2453 | ||
2454 | /* a field/op pair that is not caught here will simply fall through | |
2455 | without a match */ | |
2456 | switch (field) { | |
3a6b9f85 | 2457 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2458 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2459 | switch (op) { |
2460 | case AUDIT_EQUAL: | |
2461 | match = (ctxt->user == rule->au_ctxt.user); | |
2462 | break; | |
2463 | case AUDIT_NOT_EQUAL: | |
2464 | match = (ctxt->user != rule->au_ctxt.user); | |
2465 | break; | |
2466 | } | |
2467 | break; | |
3a6b9f85 | 2468 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2469 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2470 | switch (op) { |
2471 | case AUDIT_EQUAL: | |
2472 | match = (ctxt->role == rule->au_ctxt.role); | |
2473 | break; | |
2474 | case AUDIT_NOT_EQUAL: | |
2475 | match = (ctxt->role != rule->au_ctxt.role); | |
2476 | break; | |
2477 | } | |
2478 | break; | |
3a6b9f85 | 2479 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2480 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2481 | switch (op) { |
2482 | case AUDIT_EQUAL: | |
2483 | match = (ctxt->type == rule->au_ctxt.type); | |
2484 | break; | |
2485 | case AUDIT_NOT_EQUAL: | |
2486 | match = (ctxt->type != rule->au_ctxt.type); | |
2487 | break; | |
2488 | } | |
2489 | break; | |
3a6b9f85 DG |
2490 | case AUDIT_SUBJ_SEN: |
2491 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2492 | case AUDIT_OBJ_LEV_LOW: |
2493 | case AUDIT_OBJ_LEV_HIGH: | |
2494 | level = ((field == AUDIT_SUBJ_SEN || | |
5d55a345 EP |
2495 | field == AUDIT_OBJ_LEV_LOW) ? |
2496 | &ctxt->range.level[0] : &ctxt->range.level[1]); | |
376bd9cb DG |
2497 | switch (op) { |
2498 | case AUDIT_EQUAL: | |
2499 | match = mls_level_eq(&rule->au_ctxt.range.level[0], | |
5d55a345 | 2500 | level); |
376bd9cb DG |
2501 | break; |
2502 | case AUDIT_NOT_EQUAL: | |
2503 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], | |
5d55a345 | 2504 | level); |
376bd9cb DG |
2505 | break; |
2506 | case AUDIT_LESS_THAN: | |
2507 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], | |
5d55a345 EP |
2508 | level) && |
2509 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2510 | level)); | |
376bd9cb DG |
2511 | break; |
2512 | case AUDIT_LESS_THAN_OR_EQUAL: | |
2513 | match = mls_level_dom(&rule->au_ctxt.range.level[0], | |
5d55a345 | 2514 | level); |
376bd9cb DG |
2515 | break; |
2516 | case AUDIT_GREATER_THAN: | |
2517 | match = (mls_level_dom(level, | |
5d55a345 EP |
2518 | &rule->au_ctxt.range.level[0]) && |
2519 | !mls_level_eq(level, | |
2520 | &rule->au_ctxt.range.level[0])); | |
376bd9cb DG |
2521 | break; |
2522 | case AUDIT_GREATER_THAN_OR_EQUAL: | |
2523 | match = mls_level_dom(level, | |
5d55a345 | 2524 | &rule->au_ctxt.range.level[0]); |
376bd9cb DG |
2525 | break; |
2526 | } | |
2527 | } | |
2528 | ||
2529 | out: | |
2530 | POLICY_RDUNLOCK; | |
2531 | return match; | |
2532 | } | |
2533 | ||
9d57a7f9 | 2534 | static int (*aurule_callback)(void) = audit_update_lsm_rules; |
376bd9cb DG |
2535 | |
2536 | static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid, | |
2537 | u16 class, u32 perms, u32 *retained) | |
2538 | { | |
2539 | int err = 0; | |
2540 | ||
2541 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
2542 | err = aurule_callback(); | |
2543 | return err; | |
2544 | } | |
2545 | ||
2546 | static int __init aurule_init(void) | |
2547 | { | |
2548 | int err; | |
2549 | ||
2550 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET, | |
5d55a345 | 2551 | SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0); |
376bd9cb DG |
2552 | if (err) |
2553 | panic("avc_add_callback() failed, error %d\n", err); | |
2554 | ||
2555 | return err; | |
2556 | } | |
2557 | __initcall(aurule_init); | |
2558 | ||
7420ed23 | 2559 | #ifdef CONFIG_NETLABEL |
7420ed23 | 2560 | /** |
5778eabd PM |
2561 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
2562 | * @secattr: the NetLabel packet security attributes | |
5dbe1eb0 | 2563 | * @sid: the SELinux SID |
7420ed23 VY |
2564 | * |
2565 | * Description: | |
2566 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
2567 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
2568 | * already been initialized. | |
7420ed23 VY |
2569 | * |
2570 | */ | |
5778eabd | 2571 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
5dbe1eb0 | 2572 | u32 sid) |
7420ed23 | 2573 | { |
5dbe1eb0 | 2574 | u32 *sid_cache; |
7420ed23 | 2575 | |
5dbe1eb0 PM |
2576 | sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC); |
2577 | if (sid_cache == NULL) | |
5778eabd | 2578 | return; |
5dbe1eb0 PM |
2579 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
2580 | if (secattr->cache == NULL) { | |
2581 | kfree(sid_cache); | |
5778eabd | 2582 | return; |
0ec8abd7 | 2583 | } |
7420ed23 | 2584 | |
5dbe1eb0 PM |
2585 | *sid_cache = sid; |
2586 | secattr->cache->free = kfree; | |
2587 | secattr->cache->data = sid_cache; | |
5778eabd | 2588 | secattr->flags |= NETLBL_SECATTR_CACHE; |
7420ed23 VY |
2589 | } |
2590 | ||
2591 | /** | |
5778eabd | 2592 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 | 2593 | * @secattr: the NetLabel packet security attributes |
7420ed23 VY |
2594 | * @sid: the SELinux SID |
2595 | * | |
2596 | * Description: | |
5778eabd | 2597 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 2598 | * SELinux SID. If the @secattr field does not contain a full SELinux |
5dbe1eb0 PM |
2599 | * SID/context then use SECINITSID_NETMSG as the foundation. If possibile the |
2600 | * 'cache' field of @secattr is set and the CACHE flag is set; this is to | |
2601 | * allow the @secattr to be used by NetLabel to cache the secattr to SID | |
2602 | * conversion for future lookups. Returns zero on success, negative values on | |
2603 | * failure. | |
7420ed23 VY |
2604 | * |
2605 | */ | |
5778eabd | 2606 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
5778eabd | 2607 | u32 *sid) |
7420ed23 VY |
2608 | { |
2609 | int rc = -EIDRM; | |
2610 | struct context *ctx; | |
2611 | struct context ctx_new; | |
5778eabd PM |
2612 | |
2613 | if (!ss_initialized) { | |
2614 | *sid = SECSID_NULL; | |
2615 | return 0; | |
2616 | } | |
7420ed23 VY |
2617 | |
2618 | POLICY_RDLOCK; | |
2619 | ||
701a90ba | 2620 | if (secattr->flags & NETLBL_SECATTR_CACHE) { |
5dbe1eb0 PM |
2621 | *sid = *(u32 *)secattr->cache->data; |
2622 | rc = 0; | |
16efd454 PM |
2623 | } else if (secattr->flags & NETLBL_SECATTR_SECID) { |
2624 | *sid = secattr->attr.secid; | |
2625 | rc = 0; | |
701a90ba | 2626 | } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
5dbe1eb0 | 2627 | ctx = sidtab_search(&sidtab, SECINITSID_NETMSG); |
7420ed23 VY |
2628 | if (ctx == NULL) |
2629 | goto netlbl_secattr_to_sid_return; | |
2630 | ||
2631 | ctx_new.user = ctx->user; | |
2632 | ctx_new.role = ctx->role; | |
2633 | ctx_new.type = ctx->type; | |
02752760 | 2634 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 2635 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
02752760 | 2636 | if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat, |
16efd454 | 2637 | secattr->attr.mls.cat) != 0) |
7420ed23 VY |
2638 | goto netlbl_secattr_to_sid_return; |
2639 | ctx_new.range.level[1].cat.highbit = | |
2640 | ctx_new.range.level[0].cat.highbit; | |
2641 | ctx_new.range.level[1].cat.node = | |
2642 | ctx_new.range.level[0].cat.node; | |
2643 | } else { | |
2644 | ebitmap_init(&ctx_new.range.level[0].cat); | |
2645 | ebitmap_init(&ctx_new.range.level[1].cat); | |
2646 | } | |
2647 | if (mls_context_isvalid(&policydb, &ctx_new) != 1) | |
2648 | goto netlbl_secattr_to_sid_return_cleanup; | |
2649 | ||
2650 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
2651 | if (rc != 0) | |
2652 | goto netlbl_secattr_to_sid_return_cleanup; | |
2653 | ||
5dbe1eb0 | 2654 | security_netlbl_cache_add(secattr, *sid); |
5778eabd | 2655 | |
7420ed23 VY |
2656 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
2657 | } else { | |
388b2405 | 2658 | *sid = SECSID_NULL; |
7420ed23 VY |
2659 | rc = 0; |
2660 | } | |
2661 | ||
2662 | netlbl_secattr_to_sid_return: | |
2663 | POLICY_RDUNLOCK; | |
2664 | return rc; | |
2665 | netlbl_secattr_to_sid_return_cleanup: | |
2666 | ebitmap_destroy(&ctx_new.range.level[0].cat); | |
2667 | goto netlbl_secattr_to_sid_return; | |
2668 | } | |
2669 | ||
2670 | /** | |
5778eabd PM |
2671 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
2672 | * @sid: the SELinux SID | |
2673 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
2674 | * |
2675 | * Description: | |
5778eabd PM |
2676 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
2677 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
2678 | * |
2679 | */ | |
5778eabd | 2680 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 VY |
2681 | { |
2682 | int rc = -ENOENT; | |
7420ed23 VY |
2683 | struct context *ctx; |
2684 | ||
2685 | if (!ss_initialized) | |
2686 | return 0; | |
2687 | ||
2688 | POLICY_RDLOCK; | |
7420ed23 VY |
2689 | ctx = sidtab_search(&sidtab, sid); |
2690 | if (ctx == NULL) | |
5778eabd PM |
2691 | goto netlbl_sid_to_secattr_failure; |
2692 | secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], | |
2693 | GFP_ATOMIC); | |
00447872 | 2694 | secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY; |
5778eabd PM |
2695 | mls_export_netlbl_lvl(ctx, secattr); |
2696 | rc = mls_export_netlbl_cat(ctx, secattr); | |
bf0edf39 | 2697 | if (rc != 0) |
5778eabd | 2698 | goto netlbl_sid_to_secattr_failure; |
7420ed23 | 2699 | POLICY_RDUNLOCK; |
99f59ed0 | 2700 | |
5778eabd | 2701 | return 0; |
f8687afe | 2702 | |
5778eabd PM |
2703 | netlbl_sid_to_secattr_failure: |
2704 | POLICY_RDUNLOCK; | |
f8687afe PM |
2705 | return rc; |
2706 | } | |
7420ed23 | 2707 | #endif /* CONFIG_NETLABEL */ |