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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Implementation of the security services. | |
3 | * | |
4 | * Authors : Stephen Smalley, <sds@epoch.ncsc.mil> | |
5 | * James Morris <jmorris@redhat.com> | |
6 | * | |
7 | * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> | |
8 | * | |
9 | * Support for enhanced MLS infrastructure. | |
376bd9cb | 10 | * Support for context based audit filters. |
1da177e4 LT |
11 | * |
12 | * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> | |
13 | * | |
14 | * Added conditional policy language extensions | |
15 | * | |
7420ed23 VY |
16 | * Updated: Hewlett-Packard <paul.moore@hp.com> |
17 | * | |
18 | * Added support for NetLabel | |
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 | |
30 | * it under the terms of the GNU General Public License as published by | |
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> |
7420ed23 | 43 | #include <net/netlabel.h> |
bb003079 | 44 | |
1da177e4 LT |
45 | #include "flask.h" |
46 | #include "avc.h" | |
47 | #include "avc_ss.h" | |
48 | #include "security.h" | |
49 | #include "context.h" | |
50 | #include "policydb.h" | |
51 | #include "sidtab.h" | |
52 | #include "services.h" | |
53 | #include "conditional.h" | |
54 | #include "mls.h" | |
7420ed23 | 55 | #include "objsec.h" |
c60475bf | 56 | #include "netlabel.h" |
3de4bab5 | 57 | #include "xfrm.h" |
02752760 | 58 | #include "ebitmap.h" |
1da177e4 LT |
59 | |
60 | extern void selnl_notify_policyload(u32 seqno); | |
61 | unsigned int policydb_loaded_version; | |
62 | ||
3bb56b25 | 63 | int selinux_policycap_netpeer; |
b0c636b9 | 64 | int selinux_policycap_openperm; |
3bb56b25 | 65 | |
b94c7e67 CS |
66 | /* |
67 | * This is declared in avc.c | |
68 | */ | |
69 | extern const struct selinux_class_perm selinux_class_perm; | |
70 | ||
1da177e4 LT |
71 | static DEFINE_RWLOCK(policy_rwlock); |
72 | #define POLICY_RDLOCK read_lock(&policy_rwlock) | |
73 | #define POLICY_WRLOCK write_lock_irq(&policy_rwlock) | |
74 | #define POLICY_RDUNLOCK read_unlock(&policy_rwlock) | |
75 | #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock) | |
76 | ||
bb003079 IM |
77 | static DEFINE_MUTEX(load_mutex); |
78 | #define LOAD_LOCK mutex_lock(&load_mutex) | |
79 | #define LOAD_UNLOCK mutex_unlock(&load_mutex) | |
1da177e4 LT |
80 | |
81 | static struct sidtab sidtab; | |
82 | struct policydb policydb; | |
83 | int ss_initialized = 0; | |
84 | ||
85 | /* | |
86 | * The largest sequence number that has been used when | |
87 | * providing an access decision to the access vector cache. | |
88 | * The sequence number only changes when a policy change | |
89 | * occurs. | |
90 | */ | |
91 | static u32 latest_granting = 0; | |
92 | ||
93 | /* Forward declaration. */ | |
94 | static int context_struct_to_string(struct context *context, char **scontext, | |
95 | u32 *scontext_len); | |
96 | ||
97 | /* | |
98 | * Return the boolean value of a constraint expression | |
99 | * when it is applied to the specified source and target | |
100 | * security contexts. | |
101 | * | |
102 | * xcontext is a special beast... It is used by the validatetrans rules | |
103 | * only. For these rules, scontext is the context before the transition, | |
104 | * tcontext is the context after the transition, and xcontext is the context | |
105 | * of the process performing the transition. All other callers of | |
106 | * constraint_expr_eval should pass in NULL for xcontext. | |
107 | */ | |
108 | static int constraint_expr_eval(struct context *scontext, | |
109 | struct context *tcontext, | |
110 | struct context *xcontext, | |
111 | struct constraint_expr *cexpr) | |
112 | { | |
113 | u32 val1, val2; | |
114 | struct context *c; | |
115 | struct role_datum *r1, *r2; | |
116 | struct mls_level *l1, *l2; | |
117 | struct constraint_expr *e; | |
118 | int s[CEXPR_MAXDEPTH]; | |
119 | int sp = -1; | |
120 | ||
121 | for (e = cexpr; e; e = e->next) { | |
122 | switch (e->expr_type) { | |
123 | case CEXPR_NOT: | |
124 | BUG_ON(sp < 0); | |
125 | s[sp] = !s[sp]; | |
126 | break; | |
127 | case CEXPR_AND: | |
128 | BUG_ON(sp < 1); | |
129 | sp--; | |
130 | s[sp] &= s[sp+1]; | |
131 | break; | |
132 | case CEXPR_OR: | |
133 | BUG_ON(sp < 1); | |
134 | sp--; | |
135 | s[sp] |= s[sp+1]; | |
136 | break; | |
137 | case CEXPR_ATTR: | |
138 | if (sp == (CEXPR_MAXDEPTH-1)) | |
139 | return 0; | |
140 | switch (e->attr) { | |
141 | case CEXPR_USER: | |
142 | val1 = scontext->user; | |
143 | val2 = tcontext->user; | |
144 | break; | |
145 | case CEXPR_TYPE: | |
146 | val1 = scontext->type; | |
147 | val2 = tcontext->type; | |
148 | break; | |
149 | case CEXPR_ROLE: | |
150 | val1 = scontext->role; | |
151 | val2 = tcontext->role; | |
152 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
153 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
154 | switch (e->op) { | |
155 | case CEXPR_DOM: | |
156 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
157 | val2 - 1); | |
158 | continue; | |
159 | case CEXPR_DOMBY: | |
160 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
161 | val1 - 1); | |
162 | continue; | |
163 | case CEXPR_INCOMP: | |
164 | s[++sp] = ( !ebitmap_get_bit(&r1->dominates, | |
165 | val2 - 1) && | |
166 | !ebitmap_get_bit(&r2->dominates, | |
167 | val1 - 1) ); | |
168 | continue; | |
169 | default: | |
170 | break; | |
171 | } | |
172 | break; | |
173 | case CEXPR_L1L2: | |
174 | l1 = &(scontext->range.level[0]); | |
175 | l2 = &(tcontext->range.level[0]); | |
176 | goto mls_ops; | |
177 | case CEXPR_L1H2: | |
178 | l1 = &(scontext->range.level[0]); | |
179 | l2 = &(tcontext->range.level[1]); | |
180 | goto mls_ops; | |
181 | case CEXPR_H1L2: | |
182 | l1 = &(scontext->range.level[1]); | |
183 | l2 = &(tcontext->range.level[0]); | |
184 | goto mls_ops; | |
185 | case CEXPR_H1H2: | |
186 | l1 = &(scontext->range.level[1]); | |
187 | l2 = &(tcontext->range.level[1]); | |
188 | goto mls_ops; | |
189 | case CEXPR_L1H1: | |
190 | l1 = &(scontext->range.level[0]); | |
191 | l2 = &(scontext->range.level[1]); | |
192 | goto mls_ops; | |
193 | case CEXPR_L2H2: | |
194 | l1 = &(tcontext->range.level[0]); | |
195 | l2 = &(tcontext->range.level[1]); | |
196 | goto mls_ops; | |
197 | mls_ops: | |
198 | switch (e->op) { | |
199 | case CEXPR_EQ: | |
200 | s[++sp] = mls_level_eq(l1, l2); | |
201 | continue; | |
202 | case CEXPR_NEQ: | |
203 | s[++sp] = !mls_level_eq(l1, l2); | |
204 | continue; | |
205 | case CEXPR_DOM: | |
206 | s[++sp] = mls_level_dom(l1, l2); | |
207 | continue; | |
208 | case CEXPR_DOMBY: | |
209 | s[++sp] = mls_level_dom(l2, l1); | |
210 | continue; | |
211 | case CEXPR_INCOMP: | |
212 | s[++sp] = mls_level_incomp(l2, l1); | |
213 | continue; | |
214 | default: | |
215 | BUG(); | |
216 | return 0; | |
217 | } | |
218 | break; | |
219 | default: | |
220 | BUG(); | |
221 | return 0; | |
222 | } | |
223 | ||
224 | switch (e->op) { | |
225 | case CEXPR_EQ: | |
226 | s[++sp] = (val1 == val2); | |
227 | break; | |
228 | case CEXPR_NEQ: | |
229 | s[++sp] = (val1 != val2); | |
230 | break; | |
231 | default: | |
232 | BUG(); | |
233 | return 0; | |
234 | } | |
235 | break; | |
236 | case CEXPR_NAMES: | |
237 | if (sp == (CEXPR_MAXDEPTH-1)) | |
238 | return 0; | |
239 | c = scontext; | |
240 | if (e->attr & CEXPR_TARGET) | |
241 | c = tcontext; | |
242 | else if (e->attr & CEXPR_XTARGET) { | |
243 | c = xcontext; | |
244 | if (!c) { | |
245 | BUG(); | |
246 | return 0; | |
247 | } | |
248 | } | |
249 | if (e->attr & CEXPR_USER) | |
250 | val1 = c->user; | |
251 | else if (e->attr & CEXPR_ROLE) | |
252 | val1 = c->role; | |
253 | else if (e->attr & CEXPR_TYPE) | |
254 | val1 = c->type; | |
255 | else { | |
256 | BUG(); | |
257 | return 0; | |
258 | } | |
259 | ||
260 | switch (e->op) { | |
261 | case CEXPR_EQ: | |
262 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
263 | break; | |
264 | case CEXPR_NEQ: | |
265 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
266 | break; | |
267 | default: | |
268 | BUG(); | |
269 | return 0; | |
270 | } | |
271 | break; | |
272 | default: | |
273 | BUG(); | |
274 | return 0; | |
275 | } | |
276 | } | |
277 | ||
278 | BUG_ON(sp != 0); | |
279 | return s[0]; | |
280 | } | |
281 | ||
282 | /* | |
283 | * Compute access vectors based on a context structure pair for | |
284 | * the permissions in a particular class. | |
285 | */ | |
286 | static int context_struct_compute_av(struct context *scontext, | |
287 | struct context *tcontext, | |
288 | u16 tclass, | |
289 | u32 requested, | |
290 | struct av_decision *avd) | |
291 | { | |
292 | struct constraint_node *constraint; | |
293 | struct role_allow *ra; | |
294 | struct avtab_key avkey; | |
782ebb99 | 295 | struct avtab_node *node; |
1da177e4 | 296 | struct class_datum *tclass_datum; |
782ebb99 SS |
297 | struct ebitmap *sattr, *tattr; |
298 | struct ebitmap_node *snode, *tnode; | |
3f12070e | 299 | const struct selinux_class_perm *kdefs = &selinux_class_perm; |
782ebb99 | 300 | unsigned int i, j; |
1da177e4 LT |
301 | |
302 | /* | |
303 | * Remap extended Netlink classes for old policy versions. | |
304 | * Do this here rather than socket_type_to_security_class() | |
305 | * in case a newer policy version is loaded, allowing sockets | |
306 | * to remain in the correct class. | |
307 | */ | |
308 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
309 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
310 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
311 | tclass = SECCLASS_NETLINK_SOCKET; | |
312 | ||
1da177e4 LT |
313 | /* |
314 | * Initialize the access vectors to the default values. | |
315 | */ | |
316 | avd->allowed = 0; | |
317 | avd->decided = 0xffffffff; | |
318 | avd->auditallow = 0; | |
319 | avd->auditdeny = 0xffffffff; | |
320 | avd->seqno = latest_granting; | |
321 | ||
3f12070e EP |
322 | /* |
323 | * Check for all the invalid cases. | |
324 | * - tclass 0 | |
325 | * - tclass > policy and > kernel | |
326 | * - tclass > policy but is a userspace class | |
327 | * - tclass > policy but we do not allow unknowns | |
328 | */ | |
329 | if (unlikely(!tclass)) | |
330 | goto inval_class; | |
331 | if (unlikely(tclass > policydb.p_classes.nprim)) | |
332 | if (tclass > kdefs->cts_len || | |
333 | !kdefs->class_to_string[tclass - 1] || | |
334 | !policydb.allow_unknown) | |
335 | goto inval_class; | |
336 | ||
337 | /* | |
338 | * Kernel class and we allow unknown so pad the allow decision | |
339 | * the pad will be all 1 for unknown classes. | |
340 | */ | |
341 | if (tclass <= kdefs->cts_len && policydb.allow_unknown) | |
342 | avd->allowed = policydb.undefined_perms[tclass - 1]; | |
343 | ||
344 | /* | |
345 | * Not in policy. Since decision is completed (all 1 or all 0) return. | |
346 | */ | |
347 | if (unlikely(tclass > policydb.p_classes.nprim)) | |
348 | return 0; | |
349 | ||
350 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
351 | ||
1da177e4 LT |
352 | /* |
353 | * If a specific type enforcement rule was defined for | |
354 | * this permission check, then use it. | |
355 | */ | |
1da177e4 | 356 | avkey.target_class = tclass; |
782ebb99 SS |
357 | avkey.specified = AVTAB_AV; |
358 | sattr = &policydb.type_attr_map[scontext->type - 1]; | |
359 | tattr = &policydb.type_attr_map[tcontext->type - 1]; | |
9fe79ad1 KK |
360 | ebitmap_for_each_positive_bit(sattr, snode, i) { |
361 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
782ebb99 SS |
362 | avkey.source_type = i + 1; |
363 | avkey.target_type = j + 1; | |
364 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
365 | node != NULL; | |
366 | node = avtab_search_node_next(node, avkey.specified)) { | |
367 | if (node->key.specified == AVTAB_ALLOWED) | |
368 | avd->allowed |= node->datum.data; | |
369 | else if (node->key.specified == AVTAB_AUDITALLOW) | |
370 | avd->auditallow |= node->datum.data; | |
371 | else if (node->key.specified == AVTAB_AUDITDENY) | |
372 | avd->auditdeny &= node->datum.data; | |
373 | } | |
1da177e4 | 374 | |
782ebb99 SS |
375 | /* Check conditional av table for additional permissions */ |
376 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); | |
377 | ||
378 | } | |
379 | } | |
1da177e4 LT |
380 | |
381 | /* | |
382 | * Remove any permissions prohibited by a constraint (this includes | |
383 | * the MLS policy). | |
384 | */ | |
385 | constraint = tclass_datum->constraints; | |
386 | while (constraint) { | |
387 | if ((constraint->permissions & (avd->allowed)) && | |
388 | !constraint_expr_eval(scontext, tcontext, NULL, | |
389 | constraint->expr)) { | |
390 | avd->allowed = (avd->allowed) & ~(constraint->permissions); | |
391 | } | |
392 | constraint = constraint->next; | |
393 | } | |
394 | ||
395 | /* | |
396 | * If checking process transition permission and the | |
397 | * role is changing, then check the (current_role, new_role) | |
398 | * pair. | |
399 | */ | |
400 | if (tclass == SECCLASS_PROCESS && | |
401 | (avd->allowed & (PROCESS__TRANSITION | PROCESS__DYNTRANSITION)) && | |
402 | scontext->role != tcontext->role) { | |
403 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
404 | if (scontext->role == ra->role && | |
405 | tcontext->role == ra->new_role) | |
406 | break; | |
407 | } | |
408 | if (!ra) | |
409 | avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION | | |
410 | PROCESS__DYNTRANSITION); | |
411 | } | |
412 | ||
413 | return 0; | |
3f12070e EP |
414 | |
415 | inval_class: | |
416 | printk(KERN_ERR "%s: unrecognized class %d\n", __FUNCTION__, tclass); | |
417 | return -EINVAL; | |
1da177e4 LT |
418 | } |
419 | ||
420 | static int security_validtrans_handle_fail(struct context *ocontext, | |
421 | struct context *ncontext, | |
422 | struct context *tcontext, | |
423 | u16 tclass) | |
424 | { | |
425 | char *o = NULL, *n = NULL, *t = NULL; | |
426 | u32 olen, nlen, tlen; | |
427 | ||
428 | if (context_struct_to_string(ocontext, &o, &olen) < 0) | |
429 | goto out; | |
430 | if (context_struct_to_string(ncontext, &n, &nlen) < 0) | |
431 | goto out; | |
432 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
433 | goto out; | |
9ad9ad38 | 434 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
435 | "security_validate_transition: denied for" |
436 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", | |
437 | o, n, t, policydb.p_class_val_to_name[tclass-1]); | |
438 | out: | |
439 | kfree(o); | |
440 | kfree(n); | |
441 | kfree(t); | |
442 | ||
443 | if (!selinux_enforcing) | |
444 | return 0; | |
445 | return -EPERM; | |
446 | } | |
447 | ||
448 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
449 | u16 tclass) | |
450 | { | |
451 | struct context *ocontext; | |
452 | struct context *ncontext; | |
453 | struct context *tcontext; | |
454 | struct class_datum *tclass_datum; | |
455 | struct constraint_node *constraint; | |
456 | int rc = 0; | |
457 | ||
458 | if (!ss_initialized) | |
459 | return 0; | |
460 | ||
461 | POLICY_RDLOCK; | |
462 | ||
463 | /* | |
464 | * Remap extended Netlink classes for old policy versions. | |
465 | * Do this here rather than socket_type_to_security_class() | |
466 | * in case a newer policy version is loaded, allowing sockets | |
467 | * to remain in the correct class. | |
468 | */ | |
469 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
470 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
471 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
472 | tclass = SECCLASS_NETLINK_SOCKET; | |
473 | ||
474 | if (!tclass || tclass > policydb.p_classes.nprim) { | |
475 | printk(KERN_ERR "security_validate_transition: " | |
476 | "unrecognized class %d\n", tclass); | |
477 | rc = -EINVAL; | |
478 | goto out; | |
479 | } | |
480 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
481 | ||
482 | ocontext = sidtab_search(&sidtab, oldsid); | |
483 | if (!ocontext) { | |
484 | printk(KERN_ERR "security_validate_transition: " | |
485 | " unrecognized SID %d\n", oldsid); | |
486 | rc = -EINVAL; | |
487 | goto out; | |
488 | } | |
489 | ||
490 | ncontext = sidtab_search(&sidtab, newsid); | |
491 | if (!ncontext) { | |
492 | printk(KERN_ERR "security_validate_transition: " | |
493 | " unrecognized SID %d\n", newsid); | |
494 | rc = -EINVAL; | |
495 | goto out; | |
496 | } | |
497 | ||
498 | tcontext = sidtab_search(&sidtab, tasksid); | |
499 | if (!tcontext) { | |
500 | printk(KERN_ERR "security_validate_transition: " | |
501 | " unrecognized SID %d\n", tasksid); | |
502 | rc = -EINVAL; | |
503 | goto out; | |
504 | } | |
505 | ||
506 | constraint = tclass_datum->validatetrans; | |
507 | while (constraint) { | |
508 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
509 | constraint->expr)) { | |
510 | rc = security_validtrans_handle_fail(ocontext, ncontext, | |
511 | tcontext, tclass); | |
512 | goto out; | |
513 | } | |
514 | constraint = constraint->next; | |
515 | } | |
516 | ||
517 | out: | |
518 | POLICY_RDUNLOCK; | |
519 | return rc; | |
520 | } | |
521 | ||
522 | /** | |
523 | * security_compute_av - Compute access vector decisions. | |
524 | * @ssid: source security identifier | |
525 | * @tsid: target security identifier | |
526 | * @tclass: target security class | |
527 | * @requested: requested permissions | |
528 | * @avd: access vector decisions | |
529 | * | |
530 | * Compute a set of access vector decisions based on the | |
531 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
532 | * Return -%EINVAL if any of the parameters are invalid or %0 | |
533 | * if the access vector decisions were computed successfully. | |
534 | */ | |
535 | int security_compute_av(u32 ssid, | |
536 | u32 tsid, | |
537 | u16 tclass, | |
538 | u32 requested, | |
539 | struct av_decision *avd) | |
540 | { | |
541 | struct context *scontext = NULL, *tcontext = NULL; | |
542 | int rc = 0; | |
543 | ||
544 | if (!ss_initialized) { | |
4c443d1b SS |
545 | avd->allowed = 0xffffffff; |
546 | avd->decided = 0xffffffff; | |
1da177e4 LT |
547 | avd->auditallow = 0; |
548 | avd->auditdeny = 0xffffffff; | |
549 | avd->seqno = latest_granting; | |
550 | return 0; | |
551 | } | |
552 | ||
553 | POLICY_RDLOCK; | |
554 | ||
555 | scontext = sidtab_search(&sidtab, ssid); | |
556 | if (!scontext) { | |
557 | printk(KERN_ERR "security_compute_av: unrecognized SID %d\n", | |
558 | ssid); | |
559 | rc = -EINVAL; | |
560 | goto out; | |
561 | } | |
562 | tcontext = sidtab_search(&sidtab, tsid); | |
563 | if (!tcontext) { | |
564 | printk(KERN_ERR "security_compute_av: unrecognized SID %d\n", | |
565 | tsid); | |
566 | rc = -EINVAL; | |
567 | goto out; | |
568 | } | |
569 | ||
570 | rc = context_struct_compute_av(scontext, tcontext, tclass, | |
571 | requested, avd); | |
572 | out: | |
573 | POLICY_RDUNLOCK; | |
574 | return rc; | |
575 | } | |
576 | ||
577 | /* | |
578 | * Write the security context string representation of | |
579 | * the context structure `context' into a dynamically | |
580 | * allocated string of the correct size. Set `*scontext' | |
581 | * to point to this string and set `*scontext_len' to | |
582 | * the length of the string. | |
583 | */ | |
584 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
585 | { | |
586 | char *scontextp; | |
587 | ||
588 | *scontext = NULL; | |
589 | *scontext_len = 0; | |
590 | ||
591 | /* Compute the size of the context. */ | |
592 | *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; | |
593 | *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; | |
594 | *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; | |
595 | *scontext_len += mls_compute_context_len(context); | |
596 | ||
597 | /* Allocate space for the context; caller must free this space. */ | |
598 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
599 | if (!scontextp) { | |
600 | return -ENOMEM; | |
601 | } | |
602 | *scontext = scontextp; | |
603 | ||
604 | /* | |
605 | * Copy the user name, role name and type name into the context. | |
606 | */ | |
607 | sprintf(scontextp, "%s:%s:%s", | |
608 | policydb.p_user_val_to_name[context->user - 1], | |
609 | policydb.p_role_val_to_name[context->role - 1], | |
610 | policydb.p_type_val_to_name[context->type - 1]); | |
611 | scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + | |
612 | 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + | |
613 | 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); | |
614 | ||
615 | mls_sid_to_context(context, &scontextp); | |
616 | ||
617 | *scontextp = 0; | |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
622 | #include "initial_sid_to_string.h" | |
623 | ||
f0ee2e46 JC |
624 | const char *security_get_initial_sid_context(u32 sid) |
625 | { | |
626 | if (unlikely(sid > SECINITSID_NUM)) | |
627 | return NULL; | |
628 | return initial_sid_to_string[sid]; | |
629 | } | |
630 | ||
1da177e4 LT |
631 | /** |
632 | * security_sid_to_context - Obtain a context for a given SID. | |
633 | * @sid: security identifier, SID | |
634 | * @scontext: security context | |
635 | * @scontext_len: length in bytes | |
636 | * | |
637 | * Write the string representation of the context associated with @sid | |
638 | * into a dynamically allocated string of the correct size. Set @scontext | |
639 | * to point to this string and set @scontext_len to the length of the string. | |
640 | */ | |
641 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
642 | { | |
643 | struct context *context; | |
644 | int rc = 0; | |
645 | ||
4f4acf3a SS |
646 | *scontext = NULL; |
647 | *scontext_len = 0; | |
648 | ||
1da177e4 LT |
649 | if (!ss_initialized) { |
650 | if (sid <= SECINITSID_NUM) { | |
651 | char *scontextp; | |
652 | ||
653 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
654 | scontextp = kmalloc(*scontext_len,GFP_ATOMIC); | |
0cccca06 SH |
655 | if (!scontextp) { |
656 | rc = -ENOMEM; | |
657 | goto out; | |
658 | } | |
1da177e4 LT |
659 | strcpy(scontextp, initial_sid_to_string[sid]); |
660 | *scontext = scontextp; | |
661 | goto out; | |
662 | } | |
663 | printk(KERN_ERR "security_sid_to_context: called before initial " | |
664 | "load_policy on unknown SID %d\n", sid); | |
665 | rc = -EINVAL; | |
666 | goto out; | |
667 | } | |
668 | POLICY_RDLOCK; | |
669 | context = sidtab_search(&sidtab, sid); | |
670 | if (!context) { | |
671 | printk(KERN_ERR "security_sid_to_context: unrecognized SID " | |
672 | "%d\n", sid); | |
673 | rc = -EINVAL; | |
674 | goto out_unlock; | |
675 | } | |
676 | rc = context_struct_to_string(context, scontext, scontext_len); | |
677 | out_unlock: | |
678 | POLICY_RDUNLOCK; | |
679 | out: | |
680 | return rc; | |
681 | ||
682 | } | |
683 | ||
869ab514 SS |
684 | static int security_context_to_sid_core(char *scontext, u32 scontext_len, |
685 | u32 *sid, u32 def_sid, gfp_t gfp_flags) | |
1da177e4 LT |
686 | { |
687 | char *scontext2; | |
688 | struct context context; | |
689 | struct role_datum *role; | |
690 | struct type_datum *typdatum; | |
691 | struct user_datum *usrdatum; | |
692 | char *scontextp, *p, oldc; | |
693 | int rc = 0; | |
694 | ||
695 | if (!ss_initialized) { | |
696 | int i; | |
697 | ||
698 | for (i = 1; i < SECINITSID_NUM; i++) { | |
699 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
700 | *sid = i; | |
701 | goto out; | |
702 | } | |
703 | } | |
704 | *sid = SECINITSID_KERNEL; | |
705 | goto out; | |
706 | } | |
707 | *sid = SECSID_NULL; | |
708 | ||
709 | /* Copy the string so that we can modify the copy as we parse it. | |
710 | The string should already by null terminated, but we append a | |
711 | null suffix to the copy to avoid problems with the existing | |
712 | attr package, which doesn't view the null terminator as part | |
713 | of the attribute value. */ | |
869ab514 | 714 | scontext2 = kmalloc(scontext_len+1, gfp_flags); |
1da177e4 LT |
715 | if (!scontext2) { |
716 | rc = -ENOMEM; | |
717 | goto out; | |
718 | } | |
719 | memcpy(scontext2, scontext, scontext_len); | |
720 | scontext2[scontext_len] = 0; | |
721 | ||
722 | context_init(&context); | |
723 | *sid = SECSID_NULL; | |
724 | ||
725 | POLICY_RDLOCK; | |
726 | ||
727 | /* Parse the security context. */ | |
728 | ||
729 | rc = -EINVAL; | |
730 | scontextp = (char *) scontext2; | |
731 | ||
732 | /* Extract the user. */ | |
733 | p = scontextp; | |
734 | while (*p && *p != ':') | |
735 | p++; | |
736 | ||
737 | if (*p == 0) | |
738 | goto out_unlock; | |
739 | ||
740 | *p++ = 0; | |
741 | ||
742 | usrdatum = hashtab_search(policydb.p_users.table, scontextp); | |
743 | if (!usrdatum) | |
744 | goto out_unlock; | |
745 | ||
746 | context.user = usrdatum->value; | |
747 | ||
748 | /* Extract role. */ | |
749 | scontextp = p; | |
750 | while (*p && *p != ':') | |
751 | p++; | |
752 | ||
753 | if (*p == 0) | |
754 | goto out_unlock; | |
755 | ||
756 | *p++ = 0; | |
757 | ||
758 | role = hashtab_search(policydb.p_roles.table, scontextp); | |
759 | if (!role) | |
760 | goto out_unlock; | |
761 | context.role = role->value; | |
762 | ||
763 | /* Extract type. */ | |
764 | scontextp = p; | |
765 | while (*p && *p != ':') | |
766 | p++; | |
767 | oldc = *p; | |
768 | *p++ = 0; | |
769 | ||
770 | typdatum = hashtab_search(policydb.p_types.table, scontextp); | |
771 | if (!typdatum) | |
772 | goto out_unlock; | |
773 | ||
774 | context.type = typdatum->value; | |
775 | ||
f5c1d5b2 | 776 | rc = mls_context_to_sid(oldc, &p, &context, &sidtab, def_sid); |
1da177e4 LT |
777 | if (rc) |
778 | goto out_unlock; | |
779 | ||
780 | if ((p - scontext2) < scontext_len) { | |
781 | rc = -EINVAL; | |
782 | goto out_unlock; | |
783 | } | |
784 | ||
785 | /* Check the validity of the new context. */ | |
786 | if (!policydb_context_isvalid(&policydb, &context)) { | |
787 | rc = -EINVAL; | |
788 | goto out_unlock; | |
789 | } | |
790 | /* Obtain the new sid. */ | |
791 | rc = sidtab_context_to_sid(&sidtab, &context, sid); | |
792 | out_unlock: | |
793 | POLICY_RDUNLOCK; | |
794 | context_destroy(&context); | |
795 | kfree(scontext2); | |
796 | out: | |
797 | return rc; | |
798 | } | |
799 | ||
f5c1d5b2 JM |
800 | /** |
801 | * security_context_to_sid - Obtain a SID for a given security context. | |
802 | * @scontext: security context | |
803 | * @scontext_len: length in bytes | |
804 | * @sid: security identifier, SID | |
805 | * | |
806 | * Obtains a SID associated with the security context that | |
807 | * has the string representation specified by @scontext. | |
808 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
809 | * memory is available, or 0 on success. | |
810 | */ | |
811 | int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid) | |
812 | { | |
813 | return security_context_to_sid_core(scontext, scontext_len, | |
869ab514 | 814 | sid, SECSID_NULL, GFP_KERNEL); |
f5c1d5b2 JM |
815 | } |
816 | ||
817 | /** | |
818 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
819 | * falling back to specified default if needed. | |
820 | * | |
821 | * @scontext: security context | |
822 | * @scontext_len: length in bytes | |
823 | * @sid: security identifier, SID | |
d133a960 | 824 | * @def_sid: default SID to assign on error |
f5c1d5b2 JM |
825 | * |
826 | * Obtains a SID associated with the security context that | |
827 | * has the string representation specified by @scontext. | |
828 | * The default SID is passed to the MLS layer to be used to allow | |
829 | * kernel labeling of the MLS field if the MLS field is not present | |
830 | * (for upgrading to MLS without full relabel). | |
831 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
832 | * memory is available, or 0 on success. | |
833 | */ | |
869ab514 SS |
834 | int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *sid, |
835 | u32 def_sid, gfp_t gfp_flags) | |
f5c1d5b2 JM |
836 | { |
837 | return security_context_to_sid_core(scontext, scontext_len, | |
869ab514 | 838 | sid, def_sid, gfp_flags); |
f5c1d5b2 JM |
839 | } |
840 | ||
1da177e4 LT |
841 | static int compute_sid_handle_invalid_context( |
842 | struct context *scontext, | |
843 | struct context *tcontext, | |
844 | u16 tclass, | |
845 | struct context *newcontext) | |
846 | { | |
847 | char *s = NULL, *t = NULL, *n = NULL; | |
848 | u32 slen, tlen, nlen; | |
849 | ||
850 | if (context_struct_to_string(scontext, &s, &slen) < 0) | |
851 | goto out; | |
852 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
853 | goto out; | |
854 | if (context_struct_to_string(newcontext, &n, &nlen) < 0) | |
855 | goto out; | |
9ad9ad38 | 856 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
857 | "security_compute_sid: invalid context %s" |
858 | " for scontext=%s" | |
859 | " tcontext=%s" | |
860 | " tclass=%s", | |
861 | n, s, t, policydb.p_class_val_to_name[tclass-1]); | |
862 | out: | |
863 | kfree(s); | |
864 | kfree(t); | |
865 | kfree(n); | |
866 | if (!selinux_enforcing) | |
867 | return 0; | |
868 | return -EACCES; | |
869 | } | |
870 | ||
871 | static int security_compute_sid(u32 ssid, | |
872 | u32 tsid, | |
873 | u16 tclass, | |
874 | u32 specified, | |
875 | u32 *out_sid) | |
876 | { | |
877 | struct context *scontext = NULL, *tcontext = NULL, newcontext; | |
878 | struct role_trans *roletr = NULL; | |
879 | struct avtab_key avkey; | |
880 | struct avtab_datum *avdatum; | |
881 | struct avtab_node *node; | |
1da177e4 LT |
882 | int rc = 0; |
883 | ||
884 | if (!ss_initialized) { | |
885 | switch (tclass) { | |
886 | case SECCLASS_PROCESS: | |
887 | *out_sid = ssid; | |
888 | break; | |
889 | default: | |
890 | *out_sid = tsid; | |
891 | break; | |
892 | } | |
893 | goto out; | |
894 | } | |
895 | ||
851f8a69 VY |
896 | context_init(&newcontext); |
897 | ||
1da177e4 LT |
898 | POLICY_RDLOCK; |
899 | ||
900 | scontext = sidtab_search(&sidtab, ssid); | |
901 | if (!scontext) { | |
902 | printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n", | |
903 | ssid); | |
904 | rc = -EINVAL; | |
905 | goto out_unlock; | |
906 | } | |
907 | tcontext = sidtab_search(&sidtab, tsid); | |
908 | if (!tcontext) { | |
909 | printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n", | |
910 | tsid); | |
911 | rc = -EINVAL; | |
912 | goto out_unlock; | |
913 | } | |
914 | ||
1da177e4 LT |
915 | /* Set the user identity. */ |
916 | switch (specified) { | |
917 | case AVTAB_TRANSITION: | |
918 | case AVTAB_CHANGE: | |
919 | /* Use the process user identity. */ | |
920 | newcontext.user = scontext->user; | |
921 | break; | |
922 | case AVTAB_MEMBER: | |
923 | /* Use the related object owner. */ | |
924 | newcontext.user = tcontext->user; | |
925 | break; | |
926 | } | |
927 | ||
928 | /* Set the role and type to default values. */ | |
929 | switch (tclass) { | |
930 | case SECCLASS_PROCESS: | |
931 | /* Use the current role and type of process. */ | |
932 | newcontext.role = scontext->role; | |
933 | newcontext.type = scontext->type; | |
934 | break; | |
935 | default: | |
936 | /* Use the well-defined object role. */ | |
937 | newcontext.role = OBJECT_R_VAL; | |
938 | /* Use the type of the related object. */ | |
939 | newcontext.type = tcontext->type; | |
940 | } | |
941 | ||
942 | /* Look for a type transition/member/change rule. */ | |
943 | avkey.source_type = scontext->type; | |
944 | avkey.target_type = tcontext->type; | |
945 | avkey.target_class = tclass; | |
782ebb99 SS |
946 | avkey.specified = specified; |
947 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
948 | |
949 | /* If no permanent rule, also check for enabled conditional rules */ | |
950 | if(!avdatum) { | |
782ebb99 | 951 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
1da177e4 | 952 | for (; node != NULL; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 953 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
954 | avdatum = &node->datum; |
955 | break; | |
956 | } | |
957 | } | |
958 | } | |
959 | ||
782ebb99 | 960 | if (avdatum) { |
1da177e4 | 961 | /* Use the type from the type transition/member/change rule. */ |
782ebb99 | 962 | newcontext.type = avdatum->data; |
1da177e4 LT |
963 | } |
964 | ||
965 | /* Check for class-specific changes. */ | |
966 | switch (tclass) { | |
967 | case SECCLASS_PROCESS: | |
968 | if (specified & AVTAB_TRANSITION) { | |
969 | /* Look for a role transition rule. */ | |
970 | for (roletr = policydb.role_tr; roletr; | |
971 | roletr = roletr->next) { | |
972 | if (roletr->role == scontext->role && | |
973 | roletr->type == tcontext->type) { | |
974 | /* Use the role transition rule. */ | |
975 | newcontext.role = roletr->new_role; | |
976 | break; | |
977 | } | |
978 | } | |
979 | } | |
980 | break; | |
981 | default: | |
982 | break; | |
983 | } | |
984 | ||
985 | /* Set the MLS attributes. | |
986 | This is done last because it may allocate memory. */ | |
987 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext); | |
988 | if (rc) | |
989 | goto out_unlock; | |
990 | ||
991 | /* Check the validity of the context. */ | |
992 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
993 | rc = compute_sid_handle_invalid_context(scontext, | |
994 | tcontext, | |
995 | tclass, | |
996 | &newcontext); | |
997 | if (rc) | |
998 | goto out_unlock; | |
999 | } | |
1000 | /* Obtain the sid for the context. */ | |
1001 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
1002 | out_unlock: | |
1003 | POLICY_RDUNLOCK; | |
1004 | context_destroy(&newcontext); | |
1005 | out: | |
1006 | return rc; | |
1007 | } | |
1008 | ||
1009 | /** | |
1010 | * security_transition_sid - Compute the SID for a new subject/object. | |
1011 | * @ssid: source security identifier | |
1012 | * @tsid: target security identifier | |
1013 | * @tclass: target security class | |
1014 | * @out_sid: security identifier for new subject/object | |
1015 | * | |
1016 | * Compute a SID to use for labeling a new subject or object in the | |
1017 | * class @tclass based on a SID pair (@ssid, @tsid). | |
1018 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1019 | * if insufficient memory is available, or %0 if the new SID was | |
1020 | * computed successfully. | |
1021 | */ | |
1022 | int security_transition_sid(u32 ssid, | |
1023 | u32 tsid, | |
1024 | u16 tclass, | |
1025 | u32 *out_sid) | |
1026 | { | |
1027 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid); | |
1028 | } | |
1029 | ||
1030 | /** | |
1031 | * security_member_sid - Compute the SID for member selection. | |
1032 | * @ssid: source security identifier | |
1033 | * @tsid: target security identifier | |
1034 | * @tclass: target security class | |
1035 | * @out_sid: security identifier for selected member | |
1036 | * | |
1037 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1038 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1039 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1040 | * if insufficient memory is available, or %0 if the SID was | |
1041 | * computed successfully. | |
1042 | */ | |
1043 | int security_member_sid(u32 ssid, | |
1044 | u32 tsid, | |
1045 | u16 tclass, | |
1046 | u32 *out_sid) | |
1047 | { | |
1048 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid); | |
1049 | } | |
1050 | ||
1051 | /** | |
1052 | * security_change_sid - Compute the SID for object relabeling. | |
1053 | * @ssid: source security identifier | |
1054 | * @tsid: target security identifier | |
1055 | * @tclass: target security class | |
1056 | * @out_sid: security identifier for selected member | |
1057 | * | |
1058 | * Compute a SID to use for relabeling an object of class @tclass | |
1059 | * based on a SID pair (@ssid, @tsid). | |
1060 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1061 | * if insufficient memory is available, or %0 if the SID was | |
1062 | * computed successfully. | |
1063 | */ | |
1064 | int security_change_sid(u32 ssid, | |
1065 | u32 tsid, | |
1066 | u16 tclass, | |
1067 | u32 *out_sid) | |
1068 | { | |
1069 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid); | |
1070 | } | |
1071 | ||
b94c7e67 CS |
1072 | /* |
1073 | * Verify that each kernel class that is defined in the | |
1074 | * policy is correct | |
1075 | */ | |
1076 | static int validate_classes(struct policydb *p) | |
1077 | { | |
1078 | int i, j; | |
1079 | struct class_datum *cladatum; | |
1080 | struct perm_datum *perdatum; | |
1081 | u32 nprim, tmp, common_pts_len, perm_val, pol_val; | |
1082 | u16 class_val; | |
1083 | const struct selinux_class_perm *kdefs = &selinux_class_perm; | |
1084 | const char *def_class, *def_perm, *pol_class; | |
1085 | struct symtab *perms; | |
1086 | ||
3f12070e EP |
1087 | if (p->allow_unknown) { |
1088 | u32 num_classes = kdefs->cts_len; | |
1089 | p->undefined_perms = kcalloc(num_classes, sizeof(u32), GFP_KERNEL); | |
1090 | if (!p->undefined_perms) | |
1091 | return -ENOMEM; | |
1092 | } | |
1093 | ||
b94c7e67 CS |
1094 | for (i = 1; i < kdefs->cts_len; i++) { |
1095 | def_class = kdefs->class_to_string[i]; | |
a764ae4b SS |
1096 | if (!def_class) |
1097 | continue; | |
b94c7e67 CS |
1098 | if (i > p->p_classes.nprim) { |
1099 | printk(KERN_INFO | |
454d972c | 1100 | "SELinux: class %s not defined in policy\n", |
b94c7e67 | 1101 | def_class); |
3f12070e EP |
1102 | if (p->reject_unknown) |
1103 | return -EINVAL; | |
1104 | if (p->allow_unknown) | |
1105 | p->undefined_perms[i-1] = ~0U; | |
b94c7e67 CS |
1106 | continue; |
1107 | } | |
1108 | pol_class = p->p_class_val_to_name[i-1]; | |
1109 | if (strcmp(pol_class, def_class)) { | |
1110 | printk(KERN_ERR | |
454d972c | 1111 | "SELinux: class %d is incorrect, found %s but should be %s\n", |
b94c7e67 CS |
1112 | i, pol_class, def_class); |
1113 | return -EINVAL; | |
1114 | } | |
1115 | } | |
1116 | for (i = 0; i < kdefs->av_pts_len; i++) { | |
1117 | class_val = kdefs->av_perm_to_string[i].tclass; | |
1118 | perm_val = kdefs->av_perm_to_string[i].value; | |
1119 | def_perm = kdefs->av_perm_to_string[i].name; | |
1120 | if (class_val > p->p_classes.nprim) | |
1121 | continue; | |
1122 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1123 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1124 | BUG_ON(!cladatum); | |
1125 | perms = &cladatum->permissions; | |
1126 | nprim = 1 << (perms->nprim - 1); | |
1127 | if (perm_val > nprim) { | |
1128 | printk(KERN_INFO | |
454d972c | 1129 | "SELinux: permission %s in class %s not defined in policy\n", |
b94c7e67 | 1130 | def_perm, pol_class); |
3f12070e EP |
1131 | if (p->reject_unknown) |
1132 | return -EINVAL; | |
1133 | if (p->allow_unknown) | |
1134 | p->undefined_perms[class_val-1] |= perm_val; | |
b94c7e67 CS |
1135 | continue; |
1136 | } | |
1137 | perdatum = hashtab_search(perms->table, def_perm); | |
1138 | if (perdatum == NULL) { | |
1139 | printk(KERN_ERR | |
454d972c | 1140 | "SELinux: permission %s in class %s not found in policy, bad policy\n", |
b94c7e67 CS |
1141 | def_perm, pol_class); |
1142 | return -EINVAL; | |
1143 | } | |
1144 | pol_val = 1 << (perdatum->value - 1); | |
1145 | if (pol_val != perm_val) { | |
1146 | printk(KERN_ERR | |
454d972c | 1147 | "SELinux: permission %s in class %s has incorrect value\n", |
b94c7e67 CS |
1148 | def_perm, pol_class); |
1149 | return -EINVAL; | |
1150 | } | |
1151 | } | |
1152 | for (i = 0; i < kdefs->av_inherit_len; i++) { | |
1153 | class_val = kdefs->av_inherit[i].tclass; | |
1154 | if (class_val > p->p_classes.nprim) | |
1155 | continue; | |
1156 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1157 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1158 | BUG_ON(!cladatum); | |
1159 | if (!cladatum->comdatum) { | |
1160 | printk(KERN_ERR | |
454d972c | 1161 | "SELinux: class %s should have an inherits clause but does not\n", |
b94c7e67 CS |
1162 | pol_class); |
1163 | return -EINVAL; | |
1164 | } | |
1165 | tmp = kdefs->av_inherit[i].common_base; | |
1166 | common_pts_len = 0; | |
1167 | while (!(tmp & 0x01)) { | |
1168 | common_pts_len++; | |
1169 | tmp >>= 1; | |
1170 | } | |
1171 | perms = &cladatum->comdatum->permissions; | |
1172 | for (j = 0; j < common_pts_len; j++) { | |
1173 | def_perm = kdefs->av_inherit[i].common_pts[j]; | |
1174 | if (j >= perms->nprim) { | |
1175 | printk(KERN_INFO | |
454d972c | 1176 | "SELinux: permission %s in class %s not defined in policy\n", |
b94c7e67 | 1177 | def_perm, pol_class); |
3f12070e EP |
1178 | if (p->reject_unknown) |
1179 | return -EINVAL; | |
1180 | if (p->allow_unknown) | |
1181 | p->undefined_perms[class_val-1] |= (1 << j); | |
b94c7e67 CS |
1182 | continue; |
1183 | } | |
1184 | perdatum = hashtab_search(perms->table, def_perm); | |
1185 | if (perdatum == NULL) { | |
1186 | printk(KERN_ERR | |
454d972c | 1187 | "SELinux: permission %s in class %s not found in policy, bad policy\n", |
b94c7e67 CS |
1188 | def_perm, pol_class); |
1189 | return -EINVAL; | |
1190 | } | |
1191 | if (perdatum->value != j + 1) { | |
1192 | printk(KERN_ERR | |
454d972c | 1193 | "SELinux: permission %s in class %s has incorrect value\n", |
b94c7e67 CS |
1194 | def_perm, pol_class); |
1195 | return -EINVAL; | |
1196 | } | |
1197 | } | |
1198 | } | |
1199 | return 0; | |
1200 | } | |
1201 | ||
1da177e4 LT |
1202 | /* Clone the SID into the new SID table. */ |
1203 | static int clone_sid(u32 sid, | |
1204 | struct context *context, | |
1205 | void *arg) | |
1206 | { | |
1207 | struct sidtab *s = arg; | |
1208 | ||
1209 | return sidtab_insert(s, sid, context); | |
1210 | } | |
1211 | ||
1212 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1213 | { | |
1214 | int rc = 0; | |
1215 | ||
1216 | if (selinux_enforcing) { | |
1217 | rc = -EINVAL; | |
1218 | } else { | |
1219 | char *s; | |
1220 | u32 len; | |
1221 | ||
1222 | context_struct_to_string(context, &s, &len); | |
454d972c | 1223 | printk(KERN_ERR "SELinux: context %s is invalid\n", s); |
1da177e4 LT |
1224 | kfree(s); |
1225 | } | |
1226 | return rc; | |
1227 | } | |
1228 | ||
1229 | struct convert_context_args { | |
1230 | struct policydb *oldp; | |
1231 | struct policydb *newp; | |
1232 | }; | |
1233 | ||
1234 | /* | |
1235 | * Convert the values in the security context | |
1236 | * structure `c' from the values specified | |
1237 | * in the policy `p->oldp' to the values specified | |
1238 | * in the policy `p->newp'. Verify that the | |
1239 | * context is valid under the new policy. | |
1240 | */ | |
1241 | static int convert_context(u32 key, | |
1242 | struct context *c, | |
1243 | void *p) | |
1244 | { | |
1245 | struct convert_context_args *args; | |
1246 | struct context oldc; | |
1247 | struct role_datum *role; | |
1248 | struct type_datum *typdatum; | |
1249 | struct user_datum *usrdatum; | |
1250 | char *s; | |
1251 | u32 len; | |
1252 | int rc; | |
1253 | ||
1254 | args = p; | |
1255 | ||
1256 | rc = context_cpy(&oldc, c); | |
1257 | if (rc) | |
1258 | goto out; | |
1259 | ||
1260 | rc = -EINVAL; | |
1261 | ||
1262 | /* Convert the user. */ | |
1263 | usrdatum = hashtab_search(args->newp->p_users.table, | |
1264 | args->oldp->p_user_val_to_name[c->user - 1]); | |
1265 | if (!usrdatum) { | |
1266 | goto bad; | |
1267 | } | |
1268 | c->user = usrdatum->value; | |
1269 | ||
1270 | /* Convert the role. */ | |
1271 | role = hashtab_search(args->newp->p_roles.table, | |
1272 | args->oldp->p_role_val_to_name[c->role - 1]); | |
1273 | if (!role) { | |
1274 | goto bad; | |
1275 | } | |
1276 | c->role = role->value; | |
1277 | ||
1278 | /* Convert the type. */ | |
1279 | typdatum = hashtab_search(args->newp->p_types.table, | |
1280 | args->oldp->p_type_val_to_name[c->type - 1]); | |
1281 | if (!typdatum) { | |
1282 | goto bad; | |
1283 | } | |
1284 | c->type = typdatum->value; | |
1285 | ||
1286 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1287 | if (rc) | |
1288 | goto bad; | |
1289 | ||
1290 | /* Check the validity of the new context. */ | |
1291 | if (!policydb_context_isvalid(args->newp, c)) { | |
1292 | rc = convert_context_handle_invalid_context(&oldc); | |
1293 | if (rc) | |
1294 | goto bad; | |
1295 | } | |
1296 | ||
1297 | context_destroy(&oldc); | |
1298 | out: | |
1299 | return rc; | |
1300 | bad: | |
1301 | context_struct_to_string(&oldc, &s, &len); | |
1302 | context_destroy(&oldc); | |
454d972c | 1303 | printk(KERN_ERR "SELinux: invalidating context %s\n", s); |
1da177e4 LT |
1304 | kfree(s); |
1305 | goto out; | |
1306 | } | |
1307 | ||
3bb56b25 PM |
1308 | static void security_load_policycaps(void) |
1309 | { | |
1310 | selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps, | |
1311 | POLICYDB_CAPABILITY_NETPEER); | |
b0c636b9 EP |
1312 | selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps, |
1313 | POLICYDB_CAPABILITY_OPENPERM); | |
3bb56b25 PM |
1314 | } |
1315 | ||
1da177e4 | 1316 | extern void selinux_complete_init(void); |
e900a7d9 | 1317 | static int security_preserve_bools(struct policydb *p); |
1da177e4 LT |
1318 | |
1319 | /** | |
1320 | * security_load_policy - Load a security policy configuration. | |
1321 | * @data: binary policy data | |
1322 | * @len: length of data in bytes | |
1323 | * | |
1324 | * Load a new set of security policy configuration data, | |
1325 | * validate it and convert the SID table as necessary. | |
1326 | * This function will flush the access vector cache after | |
1327 | * loading the new policy. | |
1328 | */ | |
1329 | int security_load_policy(void *data, size_t len) | |
1330 | { | |
1331 | struct policydb oldpolicydb, newpolicydb; | |
1332 | struct sidtab oldsidtab, newsidtab; | |
1333 | struct convert_context_args args; | |
1334 | u32 seqno; | |
1335 | int rc = 0; | |
1336 | struct policy_file file = { data, len }, *fp = &file; | |
1337 | ||
1338 | LOAD_LOCK; | |
1339 | ||
1340 | if (!ss_initialized) { | |
1341 | avtab_cache_init(); | |
1342 | if (policydb_read(&policydb, fp)) { | |
1343 | LOAD_UNLOCK; | |
1344 | avtab_cache_destroy(); | |
1345 | return -EINVAL; | |
1346 | } | |
1347 | if (policydb_load_isids(&policydb, &sidtab)) { | |
1348 | LOAD_UNLOCK; | |
1349 | policydb_destroy(&policydb); | |
1350 | avtab_cache_destroy(); | |
1351 | return -EINVAL; | |
1352 | } | |
b94c7e67 CS |
1353 | /* Verify that the kernel defined classes are correct. */ |
1354 | if (validate_classes(&policydb)) { | |
1355 | printk(KERN_ERR | |
454d972c | 1356 | "SELinux: the definition of a class is incorrect\n"); |
b94c7e67 CS |
1357 | LOAD_UNLOCK; |
1358 | sidtab_destroy(&sidtab); | |
1359 | policydb_destroy(&policydb); | |
1360 | avtab_cache_destroy(); | |
1361 | return -EINVAL; | |
1362 | } | |
3bb56b25 | 1363 | security_load_policycaps(); |
1da177e4 LT |
1364 | policydb_loaded_version = policydb.policyvers; |
1365 | ss_initialized = 1; | |
4c443d1b | 1366 | seqno = ++latest_granting; |
1da177e4 LT |
1367 | LOAD_UNLOCK; |
1368 | selinux_complete_init(); | |
4c443d1b SS |
1369 | avc_ss_reset(seqno); |
1370 | selnl_notify_policyload(seqno); | |
7420ed23 | 1371 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1372 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1373 | return 0; |
1374 | } | |
1375 | ||
1376 | #if 0 | |
1377 | sidtab_hash_eval(&sidtab, "sids"); | |
1378 | #endif | |
1379 | ||
1380 | if (policydb_read(&newpolicydb, fp)) { | |
1381 | LOAD_UNLOCK; | |
1382 | return -EINVAL; | |
1383 | } | |
1384 | ||
1385 | sidtab_init(&newsidtab); | |
1386 | ||
b94c7e67 CS |
1387 | /* Verify that the kernel defined classes are correct. */ |
1388 | if (validate_classes(&newpolicydb)) { | |
1389 | printk(KERN_ERR | |
454d972c | 1390 | "SELinux: the definition of a class is incorrect\n"); |
b94c7e67 CS |
1391 | rc = -EINVAL; |
1392 | goto err; | |
1393 | } | |
1394 | ||
e900a7d9 SS |
1395 | rc = security_preserve_bools(&newpolicydb); |
1396 | if (rc) { | |
454d972c | 1397 | printk(KERN_ERR "SELinux: unable to preserve booleans\n"); |
e900a7d9 SS |
1398 | goto err; |
1399 | } | |
1400 | ||
1da177e4 LT |
1401 | /* Clone the SID table. */ |
1402 | sidtab_shutdown(&sidtab); | |
1403 | if (sidtab_map(&sidtab, clone_sid, &newsidtab)) { | |
1404 | rc = -ENOMEM; | |
1405 | goto err; | |
1406 | } | |
1407 | ||
1408 | /* Convert the internal representations of contexts | |
1409 | in the new SID table and remove invalid SIDs. */ | |
1410 | args.oldp = &policydb; | |
1411 | args.newp = &newpolicydb; | |
1412 | sidtab_map_remove_on_error(&newsidtab, convert_context, &args); | |
1413 | ||
1414 | /* Save the old policydb and SID table to free later. */ | |
1415 | memcpy(&oldpolicydb, &policydb, sizeof policydb); | |
1416 | sidtab_set(&oldsidtab, &sidtab); | |
1417 | ||
1418 | /* Install the new policydb and SID table. */ | |
1419 | POLICY_WRLOCK; | |
1420 | memcpy(&policydb, &newpolicydb, sizeof policydb); | |
1421 | sidtab_set(&sidtab, &newsidtab); | |
3bb56b25 | 1422 | security_load_policycaps(); |
1da177e4 LT |
1423 | seqno = ++latest_granting; |
1424 | policydb_loaded_version = policydb.policyvers; | |
1425 | POLICY_WRUNLOCK; | |
1426 | LOAD_UNLOCK; | |
1427 | ||
1428 | /* Free the old policydb and SID table. */ | |
1429 | policydb_destroy(&oldpolicydb); | |
1430 | sidtab_destroy(&oldsidtab); | |
1431 | ||
1432 | avc_ss_reset(seqno); | |
1433 | selnl_notify_policyload(seqno); | |
7420ed23 | 1434 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1435 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1436 | |
1437 | return 0; | |
1438 | ||
1439 | err: | |
1440 | LOAD_UNLOCK; | |
1441 | sidtab_destroy(&newsidtab); | |
1442 | policydb_destroy(&newpolicydb); | |
1443 | return rc; | |
1444 | ||
1445 | } | |
1446 | ||
1447 | /** | |
1448 | * security_port_sid - Obtain the SID for a port. | |
1449 | * @domain: communication domain aka address family | |
1450 | * @type: socket type | |
1451 | * @protocol: protocol number | |
1452 | * @port: port number | |
1453 | * @out_sid: security identifier | |
1454 | */ | |
1455 | int security_port_sid(u16 domain, | |
1456 | u16 type, | |
1457 | u8 protocol, | |
1458 | u16 port, | |
1459 | u32 *out_sid) | |
1460 | { | |
1461 | struct ocontext *c; | |
1462 | int rc = 0; | |
1463 | ||
1464 | POLICY_RDLOCK; | |
1465 | ||
1466 | c = policydb.ocontexts[OCON_PORT]; | |
1467 | while (c) { | |
1468 | if (c->u.port.protocol == protocol && | |
1469 | c->u.port.low_port <= port && | |
1470 | c->u.port.high_port >= port) | |
1471 | break; | |
1472 | c = c->next; | |
1473 | } | |
1474 | ||
1475 | if (c) { | |
1476 | if (!c->sid[0]) { | |
1477 | rc = sidtab_context_to_sid(&sidtab, | |
1478 | &c->context[0], | |
1479 | &c->sid[0]); | |
1480 | if (rc) | |
1481 | goto out; | |
1482 | } | |
1483 | *out_sid = c->sid[0]; | |
1484 | } else { | |
1485 | *out_sid = SECINITSID_PORT; | |
1486 | } | |
1487 | ||
1488 | out: | |
1489 | POLICY_RDUNLOCK; | |
1490 | return rc; | |
1491 | } | |
1492 | ||
1493 | /** | |
1494 | * security_netif_sid - Obtain the SID for a network interface. | |
1495 | * @name: interface name | |
1496 | * @if_sid: interface SID | |
1da177e4 | 1497 | */ |
e8bfdb9d | 1498 | int security_netif_sid(char *name, u32 *if_sid) |
1da177e4 LT |
1499 | { |
1500 | int rc = 0; | |
1501 | struct ocontext *c; | |
1502 | ||
1503 | POLICY_RDLOCK; | |
1504 | ||
1505 | c = policydb.ocontexts[OCON_NETIF]; | |
1506 | while (c) { | |
1507 | if (strcmp(name, c->u.name) == 0) | |
1508 | break; | |
1509 | c = c->next; | |
1510 | } | |
1511 | ||
1512 | if (c) { | |
1513 | if (!c->sid[0] || !c->sid[1]) { | |
1514 | rc = sidtab_context_to_sid(&sidtab, | |
1515 | &c->context[0], | |
1516 | &c->sid[0]); | |
1517 | if (rc) | |
1518 | goto out; | |
1519 | rc = sidtab_context_to_sid(&sidtab, | |
1520 | &c->context[1], | |
1521 | &c->sid[1]); | |
1522 | if (rc) | |
1523 | goto out; | |
1524 | } | |
1525 | *if_sid = c->sid[0]; | |
e8bfdb9d | 1526 | } else |
1da177e4 | 1527 | *if_sid = SECINITSID_NETIF; |
1da177e4 LT |
1528 | |
1529 | out: | |
1530 | POLICY_RDUNLOCK; | |
1531 | return rc; | |
1532 | } | |
1533 | ||
1534 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
1535 | { | |
1536 | int i, fail = 0; | |
1537 | ||
1538 | for(i = 0; i < 4; i++) | |
1539 | if(addr[i] != (input[i] & mask[i])) { | |
1540 | fail = 1; | |
1541 | break; | |
1542 | } | |
1543 | ||
1544 | return !fail; | |
1545 | } | |
1546 | ||
1547 | /** | |
1548 | * security_node_sid - Obtain the SID for a node (host). | |
1549 | * @domain: communication domain aka address family | |
1550 | * @addrp: address | |
1551 | * @addrlen: address length in bytes | |
1552 | * @out_sid: security identifier | |
1553 | */ | |
1554 | int security_node_sid(u16 domain, | |
1555 | void *addrp, | |
1556 | u32 addrlen, | |
1557 | u32 *out_sid) | |
1558 | { | |
1559 | int rc = 0; | |
1560 | struct ocontext *c; | |
1561 | ||
1562 | POLICY_RDLOCK; | |
1563 | ||
1564 | switch (domain) { | |
1565 | case AF_INET: { | |
1566 | u32 addr; | |
1567 | ||
1568 | if (addrlen != sizeof(u32)) { | |
1569 | rc = -EINVAL; | |
1570 | goto out; | |
1571 | } | |
1572 | ||
1573 | addr = *((u32 *)addrp); | |
1574 | ||
1575 | c = policydb.ocontexts[OCON_NODE]; | |
1576 | while (c) { | |
1577 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
1578 | break; | |
1579 | c = c->next; | |
1580 | } | |
1581 | break; | |
1582 | } | |
1583 | ||
1584 | case AF_INET6: | |
1585 | if (addrlen != sizeof(u64) * 2) { | |
1586 | rc = -EINVAL; | |
1587 | goto out; | |
1588 | } | |
1589 | c = policydb.ocontexts[OCON_NODE6]; | |
1590 | while (c) { | |
1591 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
1592 | c->u.node6.mask)) | |
1593 | break; | |
1594 | c = c->next; | |
1595 | } | |
1596 | break; | |
1597 | ||
1598 | default: | |
1599 | *out_sid = SECINITSID_NODE; | |
1600 | goto out; | |
1601 | } | |
1602 | ||
1603 | if (c) { | |
1604 | if (!c->sid[0]) { | |
1605 | rc = sidtab_context_to_sid(&sidtab, | |
1606 | &c->context[0], | |
1607 | &c->sid[0]); | |
1608 | if (rc) | |
1609 | goto out; | |
1610 | } | |
1611 | *out_sid = c->sid[0]; | |
1612 | } else { | |
1613 | *out_sid = SECINITSID_NODE; | |
1614 | } | |
1615 | ||
1616 | out: | |
1617 | POLICY_RDUNLOCK; | |
1618 | return rc; | |
1619 | } | |
1620 | ||
1621 | #define SIDS_NEL 25 | |
1622 | ||
1623 | /** | |
1624 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
1625 | * @fromsid: starting SID | |
1626 | * @username: username | |
1627 | * @sids: array of reachable SIDs for user | |
1628 | * @nel: number of elements in @sids | |
1629 | * | |
1630 | * Generate the set of SIDs for legal security contexts | |
1631 | * for a given user that can be reached by @fromsid. | |
1632 | * Set *@sids to point to a dynamically allocated | |
1633 | * array containing the set of SIDs. Set *@nel to the | |
1634 | * number of elements in the array. | |
1635 | */ | |
1636 | ||
1637 | int security_get_user_sids(u32 fromsid, | |
1638 | char *username, | |
1639 | u32 **sids, | |
1640 | u32 *nel) | |
1641 | { | |
1642 | struct context *fromcon, usercon; | |
2c3c05db | 1643 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
1644 | u32 mynel = 0, maxnel = SIDS_NEL; |
1645 | struct user_datum *user; | |
1646 | struct role_datum *role; | |
782ebb99 | 1647 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
1648 | int rc = 0, i, j; |
1649 | ||
2c3c05db SS |
1650 | *sids = NULL; |
1651 | *nel = 0; | |
1652 | ||
1653 | if (!ss_initialized) | |
1da177e4 | 1654 | goto out; |
1da177e4 LT |
1655 | |
1656 | POLICY_RDLOCK; | |
1657 | ||
1658 | fromcon = sidtab_search(&sidtab, fromsid); | |
1659 | if (!fromcon) { | |
1660 | rc = -EINVAL; | |
1661 | goto out_unlock; | |
1662 | } | |
1663 | ||
1664 | user = hashtab_search(policydb.p_users.table, username); | |
1665 | if (!user) { | |
1666 | rc = -EINVAL; | |
1667 | goto out_unlock; | |
1668 | } | |
1669 | usercon.user = user->value; | |
1670 | ||
89d155ef | 1671 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
1da177e4 LT |
1672 | if (!mysids) { |
1673 | rc = -ENOMEM; | |
1674 | goto out_unlock; | |
1675 | } | |
1da177e4 | 1676 | |
9fe79ad1 | 1677 | ebitmap_for_each_positive_bit(&user->roles, rnode, i) { |
1da177e4 LT |
1678 | role = policydb.role_val_to_struct[i]; |
1679 | usercon.role = i+1; | |
9fe79ad1 | 1680 | ebitmap_for_each_positive_bit(&role->types, tnode, j) { |
1da177e4 LT |
1681 | usercon.type = j+1; |
1682 | ||
1683 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
1684 | continue; | |
1685 | ||
1da177e4 | 1686 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
2c3c05db | 1687 | if (rc) |
1da177e4 | 1688 | goto out_unlock; |
1da177e4 LT |
1689 | if (mynel < maxnel) { |
1690 | mysids[mynel++] = sid; | |
1691 | } else { | |
1692 | maxnel += SIDS_NEL; | |
89d155ef | 1693 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
1da177e4 LT |
1694 | if (!mysids2) { |
1695 | rc = -ENOMEM; | |
1da177e4 LT |
1696 | goto out_unlock; |
1697 | } | |
1da177e4 LT |
1698 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
1699 | kfree(mysids); | |
1700 | mysids = mysids2; | |
1701 | mysids[mynel++] = sid; | |
1702 | } | |
1703 | } | |
1704 | } | |
1705 | ||
1da177e4 LT |
1706 | out_unlock: |
1707 | POLICY_RDUNLOCK; | |
2c3c05db SS |
1708 | if (rc || !mynel) { |
1709 | kfree(mysids); | |
1710 | goto out; | |
1711 | } | |
1712 | ||
1713 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); | |
1714 | if (!mysids2) { | |
1715 | rc = -ENOMEM; | |
1716 | kfree(mysids); | |
1717 | goto out; | |
1718 | } | |
1719 | for (i = 0, j = 0; i < mynel; i++) { | |
1720 | rc = avc_has_perm_noaudit(fromsid, mysids[i], | |
1721 | SECCLASS_PROCESS, | |
1722 | PROCESS__TRANSITION, AVC_STRICT, | |
1723 | NULL); | |
1724 | if (!rc) | |
1725 | mysids2[j++] = mysids[i]; | |
1726 | cond_resched(); | |
1727 | } | |
1728 | rc = 0; | |
1729 | kfree(mysids); | |
1730 | *sids = mysids2; | |
1731 | *nel = j; | |
1da177e4 LT |
1732 | out: |
1733 | return rc; | |
1734 | } | |
1735 | ||
1736 | /** | |
1737 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
1738 | * @fstype: filesystem type | |
1739 | * @path: path from root of mount | |
1740 | * @sclass: file security class | |
1741 | * @sid: SID for path | |
1742 | * | |
1743 | * Obtain a SID to use for a file in a filesystem that | |
1744 | * cannot support xattr or use a fixed labeling behavior like | |
1745 | * transition SIDs or task SIDs. | |
1746 | */ | |
1747 | int security_genfs_sid(const char *fstype, | |
1748 | char *path, | |
1749 | u16 sclass, | |
1750 | u32 *sid) | |
1751 | { | |
1752 | int len; | |
1753 | struct genfs *genfs; | |
1754 | struct ocontext *c; | |
1755 | int rc = 0, cmp = 0; | |
1756 | ||
b1aa5301 SS |
1757 | while (path[0] == '/' && path[1] == '/') |
1758 | path++; | |
1759 | ||
1da177e4 LT |
1760 | POLICY_RDLOCK; |
1761 | ||
1762 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { | |
1763 | cmp = strcmp(fstype, genfs->fstype); | |
1764 | if (cmp <= 0) | |
1765 | break; | |
1766 | } | |
1767 | ||
1768 | if (!genfs || cmp) { | |
1769 | *sid = SECINITSID_UNLABELED; | |
1770 | rc = -ENOENT; | |
1771 | goto out; | |
1772 | } | |
1773 | ||
1774 | for (c = genfs->head; c; c = c->next) { | |
1775 | len = strlen(c->u.name); | |
1776 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
1777 | (strncmp(c->u.name, path, len) == 0)) | |
1778 | break; | |
1779 | } | |
1780 | ||
1781 | if (!c) { | |
1782 | *sid = SECINITSID_UNLABELED; | |
1783 | rc = -ENOENT; | |
1784 | goto out; | |
1785 | } | |
1786 | ||
1787 | if (!c->sid[0]) { | |
1788 | rc = sidtab_context_to_sid(&sidtab, | |
1789 | &c->context[0], | |
1790 | &c->sid[0]); | |
1791 | if (rc) | |
1792 | goto out; | |
1793 | } | |
1794 | ||
1795 | *sid = c->sid[0]; | |
1796 | out: | |
1797 | POLICY_RDUNLOCK; | |
1798 | return rc; | |
1799 | } | |
1800 | ||
1801 | /** | |
1802 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
1803 | * @fstype: filesystem type | |
1804 | * @behavior: labeling behavior | |
1805 | * @sid: SID for filesystem (superblock) | |
1806 | */ | |
1807 | int security_fs_use( | |
1808 | const char *fstype, | |
1809 | unsigned int *behavior, | |
1810 | u32 *sid) | |
1811 | { | |
1812 | int rc = 0; | |
1813 | struct ocontext *c; | |
1814 | ||
1815 | POLICY_RDLOCK; | |
1816 | ||
1817 | c = policydb.ocontexts[OCON_FSUSE]; | |
1818 | while (c) { | |
1819 | if (strcmp(fstype, c->u.name) == 0) | |
1820 | break; | |
1821 | c = c->next; | |
1822 | } | |
1823 | ||
1824 | if (c) { | |
1825 | *behavior = c->v.behavior; | |
1826 | if (!c->sid[0]) { | |
1827 | rc = sidtab_context_to_sid(&sidtab, | |
1828 | &c->context[0], | |
1829 | &c->sid[0]); | |
1830 | if (rc) | |
1831 | goto out; | |
1832 | } | |
1833 | *sid = c->sid[0]; | |
1834 | } else { | |
1835 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); | |
1836 | if (rc) { | |
1837 | *behavior = SECURITY_FS_USE_NONE; | |
1838 | rc = 0; | |
1839 | } else { | |
1840 | *behavior = SECURITY_FS_USE_GENFS; | |
1841 | } | |
1842 | } | |
1843 | ||
1844 | out: | |
1845 | POLICY_RDUNLOCK; | |
1846 | return rc; | |
1847 | } | |
1848 | ||
1849 | int security_get_bools(int *len, char ***names, int **values) | |
1850 | { | |
1851 | int i, rc = -ENOMEM; | |
1852 | ||
1853 | POLICY_RDLOCK; | |
1854 | *names = NULL; | |
1855 | *values = NULL; | |
1856 | ||
1857 | *len = policydb.p_bools.nprim; | |
1858 | if (!*len) { | |
1859 | rc = 0; | |
1860 | goto out; | |
1861 | } | |
1862 | ||
e0795cf4 | 1863 | *names = kcalloc(*len, sizeof(char*), GFP_ATOMIC); |
1da177e4 LT |
1864 | if (!*names) |
1865 | goto err; | |
1da177e4 | 1866 | |
e0795cf4 | 1867 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); |
1da177e4 LT |
1868 | if (!*values) |
1869 | goto err; | |
1870 | ||
1871 | for (i = 0; i < *len; i++) { | |
1872 | size_t name_len; | |
1873 | (*values)[i] = policydb.bool_val_to_struct[i]->state; | |
1874 | name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; | |
e0795cf4 | 1875 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); |
1da177e4 LT |
1876 | if (!(*names)[i]) |
1877 | goto err; | |
1878 | strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); | |
1879 | (*names)[i][name_len - 1] = 0; | |
1880 | } | |
1881 | rc = 0; | |
1882 | out: | |
1883 | POLICY_RDUNLOCK; | |
1884 | return rc; | |
1885 | err: | |
1886 | if (*names) { | |
1887 | for (i = 0; i < *len; i++) | |
9a5f04bf | 1888 | kfree((*names)[i]); |
1da177e4 | 1889 | } |
9a5f04bf | 1890 | kfree(*values); |
1da177e4 LT |
1891 | goto out; |
1892 | } | |
1893 | ||
1894 | ||
1895 | int security_set_bools(int len, int *values) | |
1896 | { | |
1897 | int i, rc = 0; | |
1898 | int lenp, seqno = 0; | |
1899 | struct cond_node *cur; | |
1900 | ||
1901 | POLICY_WRLOCK; | |
1902 | ||
1903 | lenp = policydb.p_bools.nprim; | |
1904 | if (len != lenp) { | |
1905 | rc = -EFAULT; | |
1906 | goto out; | |
1907 | } | |
1908 | ||
1da177e4 | 1909 | for (i = 0; i < len; i++) { |
af601e46 SG |
1910 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
1911 | audit_log(current->audit_context, GFP_ATOMIC, | |
1912 | AUDIT_MAC_CONFIG_CHANGE, | |
4746ec5b | 1913 | "bool=%s val=%d old_val=%d auid=%u ses=%u", |
af601e46 SG |
1914 | policydb.p_bool_val_to_name[i], |
1915 | !!values[i], | |
1916 | policydb.bool_val_to_struct[i]->state, | |
4746ec5b EP |
1917 | audit_get_loginuid(current), |
1918 | audit_get_sessionid(current)); | |
af601e46 | 1919 | } |
1da177e4 LT |
1920 | if (values[i]) { |
1921 | policydb.bool_val_to_struct[i]->state = 1; | |
1922 | } else { | |
1923 | policydb.bool_val_to_struct[i]->state = 0; | |
1924 | } | |
1da177e4 | 1925 | } |
1da177e4 LT |
1926 | |
1927 | for (cur = policydb.cond_list; cur != NULL; cur = cur->next) { | |
1928 | rc = evaluate_cond_node(&policydb, cur); | |
1929 | if (rc) | |
1930 | goto out; | |
1931 | } | |
1932 | ||
1933 | seqno = ++latest_granting; | |
1934 | ||
1935 | out: | |
1936 | POLICY_WRUNLOCK; | |
1937 | if (!rc) { | |
1938 | avc_ss_reset(seqno); | |
1939 | selnl_notify_policyload(seqno); | |
342a0cff | 1940 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1941 | } |
1942 | return rc; | |
1943 | } | |
1944 | ||
1945 | int security_get_bool_value(int bool) | |
1946 | { | |
1947 | int rc = 0; | |
1948 | int len; | |
1949 | ||
1950 | POLICY_RDLOCK; | |
1951 | ||
1952 | len = policydb.p_bools.nprim; | |
1953 | if (bool >= len) { | |
1954 | rc = -EFAULT; | |
1955 | goto out; | |
1956 | } | |
1957 | ||
1958 | rc = policydb.bool_val_to_struct[bool]->state; | |
1959 | out: | |
1960 | POLICY_RDUNLOCK; | |
1961 | return rc; | |
1962 | } | |
376bd9cb | 1963 | |
e900a7d9 SS |
1964 | static int security_preserve_bools(struct policydb *p) |
1965 | { | |
1966 | int rc, nbools = 0, *bvalues = NULL, i; | |
1967 | char **bnames = NULL; | |
1968 | struct cond_bool_datum *booldatum; | |
1969 | struct cond_node *cur; | |
1970 | ||
1971 | rc = security_get_bools(&nbools, &bnames, &bvalues); | |
1972 | if (rc) | |
1973 | goto out; | |
1974 | for (i = 0; i < nbools; i++) { | |
1975 | booldatum = hashtab_search(p->p_bools.table, bnames[i]); | |
1976 | if (booldatum) | |
1977 | booldatum->state = bvalues[i]; | |
1978 | } | |
1979 | for (cur = p->cond_list; cur != NULL; cur = cur->next) { | |
1980 | rc = evaluate_cond_node(p, cur); | |
1981 | if (rc) | |
1982 | goto out; | |
1983 | } | |
1984 | ||
1985 | out: | |
1986 | if (bnames) { | |
1987 | for (i = 0; i < nbools; i++) | |
1988 | kfree(bnames[i]); | |
1989 | } | |
1990 | kfree(bnames); | |
1991 | kfree(bvalues); | |
1992 | return rc; | |
1993 | } | |
1994 | ||
08554d6b VY |
1995 | /* |
1996 | * security_sid_mls_copy() - computes a new sid based on the given | |
1997 | * sid and the mls portion of mls_sid. | |
1998 | */ | |
1999 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
2000 | { | |
2001 | struct context *context1; | |
2002 | struct context *context2; | |
2003 | struct context newcon; | |
2004 | char *s; | |
2005 | u32 len; | |
2006 | int rc = 0; | |
2007 | ||
4eb327b5 | 2008 | if (!ss_initialized || !selinux_mls_enabled) { |
08554d6b VY |
2009 | *new_sid = sid; |
2010 | goto out; | |
2011 | } | |
2012 | ||
2013 | context_init(&newcon); | |
2014 | ||
2015 | POLICY_RDLOCK; | |
2016 | context1 = sidtab_search(&sidtab, sid); | |
2017 | if (!context1) { | |
2018 | printk(KERN_ERR "security_sid_mls_copy: unrecognized SID " | |
2019 | "%d\n", sid); | |
2020 | rc = -EINVAL; | |
2021 | goto out_unlock; | |
2022 | } | |
2023 | ||
2024 | context2 = sidtab_search(&sidtab, mls_sid); | |
2025 | if (!context2) { | |
2026 | printk(KERN_ERR "security_sid_mls_copy: unrecognized SID " | |
2027 | "%d\n", mls_sid); | |
2028 | rc = -EINVAL; | |
2029 | goto out_unlock; | |
2030 | } | |
2031 | ||
2032 | newcon.user = context1->user; | |
2033 | newcon.role = context1->role; | |
2034 | newcon.type = context1->type; | |
0efc61ea | 2035 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
2036 | if (rc) |
2037 | goto out_unlock; | |
2038 | ||
08554d6b VY |
2039 | /* Check the validity of the new context. */ |
2040 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
2041 | rc = convert_context_handle_invalid_context(&newcon); | |
2042 | if (rc) | |
2043 | goto bad; | |
2044 | } | |
2045 | ||
2046 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
2047 | goto out_unlock; | |
2048 | ||
2049 | bad: | |
2050 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
2051 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2052 | "security_sid_mls_copy: invalid context %s", s); | |
2053 | kfree(s); | |
2054 | } | |
2055 | ||
2056 | out_unlock: | |
2057 | POLICY_RDUNLOCK; | |
2058 | context_destroy(&newcon); | |
2059 | out: | |
2060 | return rc; | |
2061 | } | |
2062 | ||
220deb96 PM |
2063 | /** |
2064 | * security_net_peersid_resolve - Compare and resolve two network peer SIDs | |
2065 | * @nlbl_sid: NetLabel SID | |
2066 | * @nlbl_type: NetLabel labeling protocol type | |
2067 | * @xfrm_sid: XFRM SID | |
2068 | * | |
2069 | * Description: | |
2070 | * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be | |
2071 | * resolved into a single SID it is returned via @peer_sid and the function | |
2072 | * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function | |
2073 | * returns a negative value. A table summarizing the behavior is below: | |
2074 | * | |
2075 | * | function return | @sid | |
2076 | * ------------------------------+-----------------+----------------- | |
2077 | * no peer labels | 0 | SECSID_NULL | |
2078 | * single peer label | 0 | <peer_label> | |
2079 | * multiple, consistent labels | 0 | <peer_label> | |
2080 | * multiple, inconsistent labels | -<errno> | SECSID_NULL | |
2081 | * | |
2082 | */ | |
2083 | int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, | |
2084 | u32 xfrm_sid, | |
2085 | u32 *peer_sid) | |
2086 | { | |
2087 | int rc; | |
2088 | struct context *nlbl_ctx; | |
2089 | struct context *xfrm_ctx; | |
2090 | ||
2091 | /* handle the common (which also happens to be the set of easy) cases | |
2092 | * right away, these two if statements catch everything involving a | |
2093 | * single or absent peer SID/label */ | |
2094 | if (xfrm_sid == SECSID_NULL) { | |
2095 | *peer_sid = nlbl_sid; | |
2096 | return 0; | |
2097 | } | |
2098 | /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label | |
2099 | * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label | |
2100 | * is present */ | |
2101 | if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { | |
2102 | *peer_sid = xfrm_sid; | |
2103 | return 0; | |
2104 | } | |
2105 | ||
2106 | /* we don't need to check ss_initialized here since the only way both | |
2107 | * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the | |
2108 | * security server was initialized and ss_initialized was true */ | |
2109 | if (!selinux_mls_enabled) { | |
2110 | *peer_sid = SECSID_NULL; | |
2111 | return 0; | |
2112 | } | |
2113 | ||
2114 | POLICY_RDLOCK; | |
2115 | ||
2116 | nlbl_ctx = sidtab_search(&sidtab, nlbl_sid); | |
2117 | if (!nlbl_ctx) { | |
2118 | printk(KERN_ERR | |
2119 | "security_sid_mls_cmp: unrecognized SID %d\n", | |
2120 | nlbl_sid); | |
2121 | rc = -EINVAL; | |
2122 | goto out_slowpath; | |
2123 | } | |
2124 | xfrm_ctx = sidtab_search(&sidtab, xfrm_sid); | |
2125 | if (!xfrm_ctx) { | |
2126 | printk(KERN_ERR | |
2127 | "security_sid_mls_cmp: unrecognized SID %d\n", | |
2128 | xfrm_sid); | |
2129 | rc = -EINVAL; | |
2130 | goto out_slowpath; | |
2131 | } | |
2132 | rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); | |
2133 | ||
2134 | out_slowpath: | |
2135 | POLICY_RDUNLOCK; | |
2136 | if (rc == 0) | |
2137 | /* at present NetLabel SIDs/labels really only carry MLS | |
2138 | * information so if the MLS portion of the NetLabel SID | |
2139 | * matches the MLS portion of the labeled XFRM SID/label | |
2140 | * then pass along the XFRM SID as it is the most | |
2141 | * expressive */ | |
2142 | *peer_sid = xfrm_sid; | |
2143 | else | |
2144 | *peer_sid = SECSID_NULL; | |
2145 | return rc; | |
2146 | } | |
2147 | ||
55fcf09b CP |
2148 | static int get_classes_callback(void *k, void *d, void *args) |
2149 | { | |
2150 | struct class_datum *datum = d; | |
2151 | char *name = k, **classes = args; | |
2152 | int value = datum->value - 1; | |
2153 | ||
2154 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
2155 | if (!classes[value]) | |
2156 | return -ENOMEM; | |
2157 | ||
2158 | return 0; | |
2159 | } | |
2160 | ||
2161 | int security_get_classes(char ***classes, int *nclasses) | |
2162 | { | |
2163 | int rc = -ENOMEM; | |
2164 | ||
2165 | POLICY_RDLOCK; | |
2166 | ||
2167 | *nclasses = policydb.p_classes.nprim; | |
2168 | *classes = kcalloc(*nclasses, sizeof(*classes), GFP_ATOMIC); | |
2169 | if (!*classes) | |
2170 | goto out; | |
2171 | ||
2172 | rc = hashtab_map(policydb.p_classes.table, get_classes_callback, | |
2173 | *classes); | |
2174 | if (rc < 0) { | |
2175 | int i; | |
2176 | for (i = 0; i < *nclasses; i++) | |
2177 | kfree((*classes)[i]); | |
2178 | kfree(*classes); | |
2179 | } | |
2180 | ||
2181 | out: | |
2182 | POLICY_RDUNLOCK; | |
2183 | return rc; | |
2184 | } | |
2185 | ||
2186 | static int get_permissions_callback(void *k, void *d, void *args) | |
2187 | { | |
2188 | struct perm_datum *datum = d; | |
2189 | char *name = k, **perms = args; | |
2190 | int value = datum->value - 1; | |
2191 | ||
2192 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
2193 | if (!perms[value]) | |
2194 | return -ENOMEM; | |
2195 | ||
2196 | return 0; | |
2197 | } | |
2198 | ||
2199 | int security_get_permissions(char *class, char ***perms, int *nperms) | |
2200 | { | |
2201 | int rc = -ENOMEM, i; | |
2202 | struct class_datum *match; | |
2203 | ||
2204 | POLICY_RDLOCK; | |
2205 | ||
2206 | match = hashtab_search(policydb.p_classes.table, class); | |
2207 | if (!match) { | |
2208 | printk(KERN_ERR "%s: unrecognized class %s\n", | |
2209 | __FUNCTION__, class); | |
2210 | rc = -EINVAL; | |
2211 | goto out; | |
2212 | } | |
2213 | ||
2214 | *nperms = match->permissions.nprim; | |
2215 | *perms = kcalloc(*nperms, sizeof(*perms), GFP_ATOMIC); | |
2216 | if (!*perms) | |
2217 | goto out; | |
2218 | ||
2219 | if (match->comdatum) { | |
2220 | rc = hashtab_map(match->comdatum->permissions.table, | |
2221 | get_permissions_callback, *perms); | |
2222 | if (rc < 0) | |
2223 | goto err; | |
2224 | } | |
2225 | ||
2226 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
2227 | *perms); | |
2228 | if (rc < 0) | |
2229 | goto err; | |
2230 | ||
2231 | out: | |
2232 | POLICY_RDUNLOCK; | |
2233 | return rc; | |
2234 | ||
2235 | err: | |
2236 | POLICY_RDUNLOCK; | |
2237 | for (i = 0; i < *nperms; i++) | |
2238 | kfree((*perms)[i]); | |
2239 | kfree(*perms); | |
2240 | return rc; | |
2241 | } | |
2242 | ||
3f12070e EP |
2243 | int security_get_reject_unknown(void) |
2244 | { | |
2245 | return policydb.reject_unknown; | |
2246 | } | |
2247 | ||
2248 | int security_get_allow_unknown(void) | |
2249 | { | |
2250 | return policydb.allow_unknown; | |
2251 | } | |
2252 | ||
3bb56b25 PM |
2253 | /** |
2254 | * security_policycap_supported - Check for a specific policy capability | |
2255 | * @req_cap: capability | |
2256 | * | |
2257 | * Description: | |
2258 | * This function queries the currently loaded policy to see if it supports the | |
2259 | * capability specified by @req_cap. Returns true (1) if the capability is | |
2260 | * supported, false (0) if it isn't supported. | |
2261 | * | |
2262 | */ | |
2263 | int security_policycap_supported(unsigned int req_cap) | |
2264 | { | |
2265 | int rc; | |
2266 | ||
2267 | POLICY_RDLOCK; | |
2268 | rc = ebitmap_get_bit(&policydb.policycaps, req_cap); | |
2269 | POLICY_RDUNLOCK; | |
2270 | ||
2271 | return rc; | |
2272 | } | |
2273 | ||
376bd9cb DG |
2274 | struct selinux_audit_rule { |
2275 | u32 au_seqno; | |
2276 | struct context au_ctxt; | |
2277 | }; | |
2278 | ||
2279 | void selinux_audit_rule_free(struct selinux_audit_rule *rule) | |
2280 | { | |
2281 | if (rule) { | |
2282 | context_destroy(&rule->au_ctxt); | |
2283 | kfree(rule); | |
2284 | } | |
2285 | } | |
2286 | ||
2287 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, | |
2288 | struct selinux_audit_rule **rule) | |
2289 | { | |
2290 | struct selinux_audit_rule *tmprule; | |
2291 | struct role_datum *roledatum; | |
2292 | struct type_datum *typedatum; | |
2293 | struct user_datum *userdatum; | |
2294 | int rc = 0; | |
2295 | ||
2296 | *rule = NULL; | |
2297 | ||
2298 | if (!ss_initialized) | |
3ad40d64 | 2299 | return -EOPNOTSUPP; |
376bd9cb DG |
2300 | |
2301 | switch (field) { | |
3a6b9f85 DG |
2302 | case AUDIT_SUBJ_USER: |
2303 | case AUDIT_SUBJ_ROLE: | |
2304 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
2305 | case AUDIT_OBJ_USER: |
2306 | case AUDIT_OBJ_ROLE: | |
2307 | case AUDIT_OBJ_TYPE: | |
376bd9cb DG |
2308 | /* only 'equals' and 'not equals' fit user, role, and type */ |
2309 | if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL) | |
2310 | return -EINVAL; | |
2311 | break; | |
3a6b9f85 DG |
2312 | case AUDIT_SUBJ_SEN: |
2313 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2314 | case AUDIT_OBJ_LEV_LOW: |
2315 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2316 | /* we do not allow a range, indicated by the presense of '-' */ |
2317 | if (strchr(rulestr, '-')) | |
2318 | return -EINVAL; | |
2319 | break; | |
2320 | default: | |
2321 | /* only the above fields are valid */ | |
2322 | return -EINVAL; | |
2323 | } | |
2324 | ||
2325 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
2326 | if (!tmprule) | |
2327 | return -ENOMEM; | |
2328 | ||
2329 | context_init(&tmprule->au_ctxt); | |
2330 | ||
2331 | POLICY_RDLOCK; | |
2332 | ||
2333 | tmprule->au_seqno = latest_granting; | |
2334 | ||
2335 | switch (field) { | |
3a6b9f85 | 2336 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2337 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2338 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
2339 | if (!userdatum) | |
2340 | rc = -EINVAL; | |
2341 | else | |
2342 | tmprule->au_ctxt.user = userdatum->value; | |
2343 | break; | |
3a6b9f85 | 2344 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2345 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2346 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
2347 | if (!roledatum) | |
2348 | rc = -EINVAL; | |
2349 | else | |
2350 | tmprule->au_ctxt.role = roledatum->value; | |
2351 | break; | |
3a6b9f85 | 2352 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2353 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2354 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
2355 | if (!typedatum) | |
2356 | rc = -EINVAL; | |
2357 | else | |
2358 | tmprule->au_ctxt.type = typedatum->value; | |
2359 | break; | |
3a6b9f85 DG |
2360 | case AUDIT_SUBJ_SEN: |
2361 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2362 | case AUDIT_OBJ_LEV_LOW: |
2363 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2364 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
2365 | break; | |
2366 | } | |
2367 | ||
2368 | POLICY_RDUNLOCK; | |
2369 | ||
2370 | if (rc) { | |
2371 | selinux_audit_rule_free(tmprule); | |
2372 | tmprule = NULL; | |
2373 | } | |
2374 | ||
2375 | *rule = tmprule; | |
2376 | ||
2377 | return rc; | |
2378 | } | |
2379 | ||
9a2f44f0 | 2380 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, |
376bd9cb DG |
2381 | struct selinux_audit_rule *rule, |
2382 | struct audit_context *actx) | |
2383 | { | |
2384 | struct context *ctxt; | |
2385 | struct mls_level *level; | |
2386 | int match = 0; | |
2387 | ||
2388 | if (!rule) { | |
2389 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2390 | "selinux_audit_rule_match: missing rule\n"); | |
2391 | return -ENOENT; | |
2392 | } | |
2393 | ||
2394 | POLICY_RDLOCK; | |
2395 | ||
2396 | if (rule->au_seqno < latest_granting) { | |
2397 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2398 | "selinux_audit_rule_match: stale rule\n"); | |
2399 | match = -ESTALE; | |
2400 | goto out; | |
2401 | } | |
2402 | ||
9a2f44f0 | 2403 | ctxt = sidtab_search(&sidtab, sid); |
376bd9cb DG |
2404 | if (!ctxt) { |
2405 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2406 | "selinux_audit_rule_match: unrecognized SID %d\n", | |
9a2f44f0 | 2407 | sid); |
376bd9cb DG |
2408 | match = -ENOENT; |
2409 | goto out; | |
2410 | } | |
2411 | ||
2412 | /* a field/op pair that is not caught here will simply fall through | |
2413 | without a match */ | |
2414 | switch (field) { | |
3a6b9f85 | 2415 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2416 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2417 | switch (op) { |
2418 | case AUDIT_EQUAL: | |
2419 | match = (ctxt->user == rule->au_ctxt.user); | |
2420 | break; | |
2421 | case AUDIT_NOT_EQUAL: | |
2422 | match = (ctxt->user != rule->au_ctxt.user); | |
2423 | break; | |
2424 | } | |
2425 | break; | |
3a6b9f85 | 2426 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2427 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2428 | switch (op) { |
2429 | case AUDIT_EQUAL: | |
2430 | match = (ctxt->role == rule->au_ctxt.role); | |
2431 | break; | |
2432 | case AUDIT_NOT_EQUAL: | |
2433 | match = (ctxt->role != rule->au_ctxt.role); | |
2434 | break; | |
2435 | } | |
2436 | break; | |
3a6b9f85 | 2437 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2438 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2439 | switch (op) { |
2440 | case AUDIT_EQUAL: | |
2441 | match = (ctxt->type == rule->au_ctxt.type); | |
2442 | break; | |
2443 | case AUDIT_NOT_EQUAL: | |
2444 | match = (ctxt->type != rule->au_ctxt.type); | |
2445 | break; | |
2446 | } | |
2447 | break; | |
3a6b9f85 DG |
2448 | case AUDIT_SUBJ_SEN: |
2449 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2450 | case AUDIT_OBJ_LEV_LOW: |
2451 | case AUDIT_OBJ_LEV_HIGH: | |
2452 | level = ((field == AUDIT_SUBJ_SEN || | |
2453 | field == AUDIT_OBJ_LEV_LOW) ? | |
376bd9cb DG |
2454 | &ctxt->range.level[0] : &ctxt->range.level[1]); |
2455 | switch (op) { | |
2456 | case AUDIT_EQUAL: | |
2457 | match = mls_level_eq(&rule->au_ctxt.range.level[0], | |
2458 | level); | |
2459 | break; | |
2460 | case AUDIT_NOT_EQUAL: | |
2461 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2462 | level); | |
2463 | break; | |
2464 | case AUDIT_LESS_THAN: | |
2465 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], | |
2466 | level) && | |
2467 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2468 | level)); | |
2469 | break; | |
2470 | case AUDIT_LESS_THAN_OR_EQUAL: | |
2471 | match = mls_level_dom(&rule->au_ctxt.range.level[0], | |
2472 | level); | |
2473 | break; | |
2474 | case AUDIT_GREATER_THAN: | |
2475 | match = (mls_level_dom(level, | |
2476 | &rule->au_ctxt.range.level[0]) && | |
2477 | !mls_level_eq(level, | |
2478 | &rule->au_ctxt.range.level[0])); | |
2479 | break; | |
2480 | case AUDIT_GREATER_THAN_OR_EQUAL: | |
2481 | match = mls_level_dom(level, | |
2482 | &rule->au_ctxt.range.level[0]); | |
2483 | break; | |
2484 | } | |
2485 | } | |
2486 | ||
2487 | out: | |
2488 | POLICY_RDUNLOCK; | |
2489 | return match; | |
2490 | } | |
2491 | ||
2492 | static int (*aurule_callback)(void) = NULL; | |
2493 | ||
2494 | static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid, | |
2495 | u16 class, u32 perms, u32 *retained) | |
2496 | { | |
2497 | int err = 0; | |
2498 | ||
2499 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
2500 | err = aurule_callback(); | |
2501 | return err; | |
2502 | } | |
2503 | ||
2504 | static int __init aurule_init(void) | |
2505 | { | |
2506 | int err; | |
2507 | ||
2508 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET, | |
2509 | SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0); | |
2510 | if (err) | |
2511 | panic("avc_add_callback() failed, error %d\n", err); | |
2512 | ||
2513 | return err; | |
2514 | } | |
2515 | __initcall(aurule_init); | |
2516 | ||
2517 | void selinux_audit_set_callback(int (*callback)(void)) | |
2518 | { | |
2519 | aurule_callback = callback; | |
2520 | } | |
7420ed23 VY |
2521 | |
2522 | #ifdef CONFIG_NETLABEL | |
7420ed23 | 2523 | /** |
5778eabd PM |
2524 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
2525 | * @secattr: the NetLabel packet security attributes | |
5dbe1eb0 | 2526 | * @sid: the SELinux SID |
7420ed23 VY |
2527 | * |
2528 | * Description: | |
2529 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
2530 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
2531 | * already been initialized. | |
7420ed23 VY |
2532 | * |
2533 | */ | |
5778eabd | 2534 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
5dbe1eb0 | 2535 | u32 sid) |
7420ed23 | 2536 | { |
5dbe1eb0 | 2537 | u32 *sid_cache; |
7420ed23 | 2538 | |
5dbe1eb0 PM |
2539 | sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC); |
2540 | if (sid_cache == NULL) | |
5778eabd | 2541 | return; |
5dbe1eb0 PM |
2542 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
2543 | if (secattr->cache == NULL) { | |
2544 | kfree(sid_cache); | |
5778eabd | 2545 | return; |
0ec8abd7 | 2546 | } |
7420ed23 | 2547 | |
5dbe1eb0 PM |
2548 | *sid_cache = sid; |
2549 | secattr->cache->free = kfree; | |
2550 | secattr->cache->data = sid_cache; | |
5778eabd | 2551 | secattr->flags |= NETLBL_SECATTR_CACHE; |
7420ed23 VY |
2552 | } |
2553 | ||
2554 | /** | |
5778eabd | 2555 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 | 2556 | * @secattr: the NetLabel packet security attributes |
7420ed23 VY |
2557 | * @sid: the SELinux SID |
2558 | * | |
2559 | * Description: | |
5778eabd | 2560 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 2561 | * SELinux SID. If the @secattr field does not contain a full SELinux |
5dbe1eb0 PM |
2562 | * SID/context then use SECINITSID_NETMSG as the foundation. If possibile the |
2563 | * 'cache' field of @secattr is set and the CACHE flag is set; this is to | |
2564 | * allow the @secattr to be used by NetLabel to cache the secattr to SID | |
2565 | * conversion for future lookups. Returns zero on success, negative values on | |
2566 | * failure. | |
7420ed23 VY |
2567 | * |
2568 | */ | |
5778eabd | 2569 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
5778eabd | 2570 | u32 *sid) |
7420ed23 VY |
2571 | { |
2572 | int rc = -EIDRM; | |
2573 | struct context *ctx; | |
2574 | struct context ctx_new; | |
5778eabd PM |
2575 | |
2576 | if (!ss_initialized) { | |
2577 | *sid = SECSID_NULL; | |
2578 | return 0; | |
2579 | } | |
7420ed23 VY |
2580 | |
2581 | POLICY_RDLOCK; | |
2582 | ||
701a90ba | 2583 | if (secattr->flags & NETLBL_SECATTR_CACHE) { |
5dbe1eb0 PM |
2584 | *sid = *(u32 *)secattr->cache->data; |
2585 | rc = 0; | |
16efd454 PM |
2586 | } else if (secattr->flags & NETLBL_SECATTR_SECID) { |
2587 | *sid = secattr->attr.secid; | |
2588 | rc = 0; | |
701a90ba | 2589 | } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
5dbe1eb0 | 2590 | ctx = sidtab_search(&sidtab, SECINITSID_NETMSG); |
7420ed23 VY |
2591 | if (ctx == NULL) |
2592 | goto netlbl_secattr_to_sid_return; | |
2593 | ||
2594 | ctx_new.user = ctx->user; | |
2595 | ctx_new.role = ctx->role; | |
2596 | ctx_new.type = ctx->type; | |
02752760 | 2597 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 2598 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
02752760 | 2599 | if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat, |
16efd454 | 2600 | secattr->attr.mls.cat) != 0) |
7420ed23 VY |
2601 | goto netlbl_secattr_to_sid_return; |
2602 | ctx_new.range.level[1].cat.highbit = | |
2603 | ctx_new.range.level[0].cat.highbit; | |
2604 | ctx_new.range.level[1].cat.node = | |
2605 | ctx_new.range.level[0].cat.node; | |
2606 | } else { | |
2607 | ebitmap_init(&ctx_new.range.level[0].cat); | |
2608 | ebitmap_init(&ctx_new.range.level[1].cat); | |
2609 | } | |
2610 | if (mls_context_isvalid(&policydb, &ctx_new) != 1) | |
2611 | goto netlbl_secattr_to_sid_return_cleanup; | |
2612 | ||
2613 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
2614 | if (rc != 0) | |
2615 | goto netlbl_secattr_to_sid_return_cleanup; | |
2616 | ||
5dbe1eb0 | 2617 | security_netlbl_cache_add(secattr, *sid); |
5778eabd | 2618 | |
7420ed23 VY |
2619 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
2620 | } else { | |
388b2405 | 2621 | *sid = SECSID_NULL; |
7420ed23 VY |
2622 | rc = 0; |
2623 | } | |
2624 | ||
2625 | netlbl_secattr_to_sid_return: | |
2626 | POLICY_RDUNLOCK; | |
2627 | return rc; | |
2628 | netlbl_secattr_to_sid_return_cleanup: | |
2629 | ebitmap_destroy(&ctx_new.range.level[0].cat); | |
2630 | goto netlbl_secattr_to_sid_return; | |
2631 | } | |
2632 | ||
2633 | /** | |
5778eabd PM |
2634 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
2635 | * @sid: the SELinux SID | |
2636 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
2637 | * |
2638 | * Description: | |
5778eabd PM |
2639 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
2640 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
2641 | * |
2642 | */ | |
5778eabd | 2643 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 VY |
2644 | { |
2645 | int rc = -ENOENT; | |
7420ed23 VY |
2646 | struct context *ctx; |
2647 | ||
2648 | if (!ss_initialized) | |
2649 | return 0; | |
2650 | ||
2651 | POLICY_RDLOCK; | |
7420ed23 VY |
2652 | ctx = sidtab_search(&sidtab, sid); |
2653 | if (ctx == NULL) | |
5778eabd PM |
2654 | goto netlbl_sid_to_secattr_failure; |
2655 | secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], | |
2656 | GFP_ATOMIC); | |
2657 | secattr->flags |= NETLBL_SECATTR_DOMAIN; | |
2658 | mls_export_netlbl_lvl(ctx, secattr); | |
2659 | rc = mls_export_netlbl_cat(ctx, secattr); | |
bf0edf39 | 2660 | if (rc != 0) |
5778eabd | 2661 | goto netlbl_sid_to_secattr_failure; |
7420ed23 | 2662 | POLICY_RDUNLOCK; |
99f59ed0 | 2663 | |
5778eabd | 2664 | return 0; |
f8687afe | 2665 | |
5778eabd PM |
2666 | netlbl_sid_to_secattr_failure: |
2667 | POLICY_RDUNLOCK; | |
f8687afe PM |
2668 | return rc; |
2669 | } | |
7420ed23 | 2670 | #endif /* CONFIG_NETLABEL */ |