Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Implementation of the security services. | |
3 | * | |
4 | * Authors : Stephen Smalley, <sds@epoch.ncsc.mil> | |
5 | * James Morris <jmorris@redhat.com> | |
6 | * | |
7 | * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> | |
8 | * | |
9 | * Support for enhanced MLS infrastructure. | |
376bd9cb | 10 | * Support for context based audit filters. |
1da177e4 LT |
11 | * |
12 | * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> | |
13 | * | |
14 | * Added conditional policy language extensions | |
15 | * | |
7420ed23 VY |
16 | * Updated: Hewlett-Packard <paul.moore@hp.com> |
17 | * | |
18 | * Added support for NetLabel | |
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 PM |
63 | int selinux_policycap_netpeer; |
64 | ||
b94c7e67 CS |
65 | /* |
66 | * This is declared in avc.c | |
67 | */ | |
68 | extern const struct selinux_class_perm selinux_class_perm; | |
69 | ||
1da177e4 LT |
70 | static DEFINE_RWLOCK(policy_rwlock); |
71 | #define POLICY_RDLOCK read_lock(&policy_rwlock) | |
72 | #define POLICY_WRLOCK write_lock_irq(&policy_rwlock) | |
73 | #define POLICY_RDUNLOCK read_unlock(&policy_rwlock) | |
74 | #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock) | |
75 | ||
bb003079 IM |
76 | static DEFINE_MUTEX(load_mutex); |
77 | #define LOAD_LOCK mutex_lock(&load_mutex) | |
78 | #define LOAD_UNLOCK mutex_unlock(&load_mutex) | |
1da177e4 LT |
79 | |
80 | static struct sidtab sidtab; | |
81 | struct policydb policydb; | |
82 | int ss_initialized = 0; | |
83 | ||
84 | /* | |
85 | * The largest sequence number that has been used when | |
86 | * providing an access decision to the access vector cache. | |
87 | * The sequence number only changes when a policy change | |
88 | * occurs. | |
89 | */ | |
90 | static u32 latest_granting = 0; | |
91 | ||
92 | /* Forward declaration. */ | |
93 | static int context_struct_to_string(struct context *context, char **scontext, | |
94 | u32 *scontext_len); | |
95 | ||
96 | /* | |
97 | * Return the boolean value of a constraint expression | |
98 | * when it is applied to the specified source and target | |
99 | * security contexts. | |
100 | * | |
101 | * xcontext is a special beast... It is used by the validatetrans rules | |
102 | * only. For these rules, scontext is the context before the transition, | |
103 | * tcontext is the context after the transition, and xcontext is the context | |
104 | * of the process performing the transition. All other callers of | |
105 | * constraint_expr_eval should pass in NULL for xcontext. | |
106 | */ | |
107 | static int constraint_expr_eval(struct context *scontext, | |
108 | struct context *tcontext, | |
109 | struct context *xcontext, | |
110 | struct constraint_expr *cexpr) | |
111 | { | |
112 | u32 val1, val2; | |
113 | struct context *c; | |
114 | struct role_datum *r1, *r2; | |
115 | struct mls_level *l1, *l2; | |
116 | struct constraint_expr *e; | |
117 | int s[CEXPR_MAXDEPTH]; | |
118 | int sp = -1; | |
119 | ||
120 | for (e = cexpr; e; e = e->next) { | |
121 | switch (e->expr_type) { | |
122 | case CEXPR_NOT: | |
123 | BUG_ON(sp < 0); | |
124 | s[sp] = !s[sp]; | |
125 | break; | |
126 | case CEXPR_AND: | |
127 | BUG_ON(sp < 1); | |
128 | sp--; | |
129 | s[sp] &= s[sp+1]; | |
130 | break; | |
131 | case CEXPR_OR: | |
132 | BUG_ON(sp < 1); | |
133 | sp--; | |
134 | s[sp] |= s[sp+1]; | |
135 | break; | |
136 | case CEXPR_ATTR: | |
137 | if (sp == (CEXPR_MAXDEPTH-1)) | |
138 | return 0; | |
139 | switch (e->attr) { | |
140 | case CEXPR_USER: | |
141 | val1 = scontext->user; | |
142 | val2 = tcontext->user; | |
143 | break; | |
144 | case CEXPR_TYPE: | |
145 | val1 = scontext->type; | |
146 | val2 = tcontext->type; | |
147 | break; | |
148 | case CEXPR_ROLE: | |
149 | val1 = scontext->role; | |
150 | val2 = tcontext->role; | |
151 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
152 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
153 | switch (e->op) { | |
154 | case CEXPR_DOM: | |
155 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
156 | val2 - 1); | |
157 | continue; | |
158 | case CEXPR_DOMBY: | |
159 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
160 | val1 - 1); | |
161 | continue; | |
162 | case CEXPR_INCOMP: | |
163 | s[++sp] = ( !ebitmap_get_bit(&r1->dominates, | |
164 | val2 - 1) && | |
165 | !ebitmap_get_bit(&r2->dominates, | |
166 | val1 - 1) ); | |
167 | continue; | |
168 | default: | |
169 | break; | |
170 | } | |
171 | break; | |
172 | case CEXPR_L1L2: | |
173 | l1 = &(scontext->range.level[0]); | |
174 | l2 = &(tcontext->range.level[0]); | |
175 | goto mls_ops; | |
176 | case CEXPR_L1H2: | |
177 | l1 = &(scontext->range.level[0]); | |
178 | l2 = &(tcontext->range.level[1]); | |
179 | goto mls_ops; | |
180 | case CEXPR_H1L2: | |
181 | l1 = &(scontext->range.level[1]); | |
182 | l2 = &(tcontext->range.level[0]); | |
183 | goto mls_ops; | |
184 | case CEXPR_H1H2: | |
185 | l1 = &(scontext->range.level[1]); | |
186 | l2 = &(tcontext->range.level[1]); | |
187 | goto mls_ops; | |
188 | case CEXPR_L1H1: | |
189 | l1 = &(scontext->range.level[0]); | |
190 | l2 = &(scontext->range.level[1]); | |
191 | goto mls_ops; | |
192 | case CEXPR_L2H2: | |
193 | l1 = &(tcontext->range.level[0]); | |
194 | l2 = &(tcontext->range.level[1]); | |
195 | goto mls_ops; | |
196 | mls_ops: | |
197 | switch (e->op) { | |
198 | case CEXPR_EQ: | |
199 | s[++sp] = mls_level_eq(l1, l2); | |
200 | continue; | |
201 | case CEXPR_NEQ: | |
202 | s[++sp] = !mls_level_eq(l1, l2); | |
203 | continue; | |
204 | case CEXPR_DOM: | |
205 | s[++sp] = mls_level_dom(l1, l2); | |
206 | continue; | |
207 | case CEXPR_DOMBY: | |
208 | s[++sp] = mls_level_dom(l2, l1); | |
209 | continue; | |
210 | case CEXPR_INCOMP: | |
211 | s[++sp] = mls_level_incomp(l2, l1); | |
212 | continue; | |
213 | default: | |
214 | BUG(); | |
215 | return 0; | |
216 | } | |
217 | break; | |
218 | default: | |
219 | BUG(); | |
220 | return 0; | |
221 | } | |
222 | ||
223 | switch (e->op) { | |
224 | case CEXPR_EQ: | |
225 | s[++sp] = (val1 == val2); | |
226 | break; | |
227 | case CEXPR_NEQ: | |
228 | s[++sp] = (val1 != val2); | |
229 | break; | |
230 | default: | |
231 | BUG(); | |
232 | return 0; | |
233 | } | |
234 | break; | |
235 | case CEXPR_NAMES: | |
236 | if (sp == (CEXPR_MAXDEPTH-1)) | |
237 | return 0; | |
238 | c = scontext; | |
239 | if (e->attr & CEXPR_TARGET) | |
240 | c = tcontext; | |
241 | else if (e->attr & CEXPR_XTARGET) { | |
242 | c = xcontext; | |
243 | if (!c) { | |
244 | BUG(); | |
245 | return 0; | |
246 | } | |
247 | } | |
248 | if (e->attr & CEXPR_USER) | |
249 | val1 = c->user; | |
250 | else if (e->attr & CEXPR_ROLE) | |
251 | val1 = c->role; | |
252 | else if (e->attr & CEXPR_TYPE) | |
253 | val1 = c->type; | |
254 | else { | |
255 | BUG(); | |
256 | return 0; | |
257 | } | |
258 | ||
259 | switch (e->op) { | |
260 | case CEXPR_EQ: | |
261 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
262 | break; | |
263 | case CEXPR_NEQ: | |
264 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
265 | break; | |
266 | default: | |
267 | BUG(); | |
268 | return 0; | |
269 | } | |
270 | break; | |
271 | default: | |
272 | BUG(); | |
273 | return 0; | |
274 | } | |
275 | } | |
276 | ||
277 | BUG_ON(sp != 0); | |
278 | return s[0]; | |
279 | } | |
280 | ||
281 | /* | |
282 | * Compute access vectors based on a context structure pair for | |
283 | * the permissions in a particular class. | |
284 | */ | |
285 | static int context_struct_compute_av(struct context *scontext, | |
286 | struct context *tcontext, | |
287 | u16 tclass, | |
288 | u32 requested, | |
289 | struct av_decision *avd) | |
290 | { | |
291 | struct constraint_node *constraint; | |
292 | struct role_allow *ra; | |
293 | struct avtab_key avkey; | |
782ebb99 | 294 | struct avtab_node *node; |
1da177e4 | 295 | struct class_datum *tclass_datum; |
782ebb99 SS |
296 | struct ebitmap *sattr, *tattr; |
297 | struct ebitmap_node *snode, *tnode; | |
3f12070e | 298 | const struct selinux_class_perm *kdefs = &selinux_class_perm; |
782ebb99 | 299 | unsigned int i, j; |
1da177e4 LT |
300 | |
301 | /* | |
302 | * Remap extended Netlink classes for old policy versions. | |
303 | * Do this here rather than socket_type_to_security_class() | |
304 | * in case a newer policy version is loaded, allowing sockets | |
305 | * to remain in the correct class. | |
306 | */ | |
307 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
308 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
309 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
310 | tclass = SECCLASS_NETLINK_SOCKET; | |
311 | ||
1da177e4 LT |
312 | /* |
313 | * Initialize the access vectors to the default values. | |
314 | */ | |
315 | avd->allowed = 0; | |
316 | avd->decided = 0xffffffff; | |
317 | avd->auditallow = 0; | |
318 | avd->auditdeny = 0xffffffff; | |
319 | avd->seqno = latest_granting; | |
320 | ||
3f12070e EP |
321 | /* |
322 | * Check for all the invalid cases. | |
323 | * - tclass 0 | |
324 | * - tclass > policy and > kernel | |
325 | * - tclass > policy but is a userspace class | |
326 | * - tclass > policy but we do not allow unknowns | |
327 | */ | |
328 | if (unlikely(!tclass)) | |
329 | goto inval_class; | |
330 | if (unlikely(tclass > policydb.p_classes.nprim)) | |
331 | if (tclass > kdefs->cts_len || | |
332 | !kdefs->class_to_string[tclass - 1] || | |
333 | !policydb.allow_unknown) | |
334 | goto inval_class; | |
335 | ||
336 | /* | |
337 | * Kernel class and we allow unknown so pad the allow decision | |
338 | * the pad will be all 1 for unknown classes. | |
339 | */ | |
340 | if (tclass <= kdefs->cts_len && policydb.allow_unknown) | |
341 | avd->allowed = policydb.undefined_perms[tclass - 1]; | |
342 | ||
343 | /* | |
344 | * Not in policy. Since decision is completed (all 1 or all 0) return. | |
345 | */ | |
346 | if (unlikely(tclass > policydb.p_classes.nprim)) | |
347 | return 0; | |
348 | ||
349 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
350 | ||
1da177e4 LT |
351 | /* |
352 | * If a specific type enforcement rule was defined for | |
353 | * this permission check, then use it. | |
354 | */ | |
1da177e4 | 355 | avkey.target_class = tclass; |
782ebb99 SS |
356 | avkey.specified = AVTAB_AV; |
357 | sattr = &policydb.type_attr_map[scontext->type - 1]; | |
358 | tattr = &policydb.type_attr_map[tcontext->type - 1]; | |
9fe79ad1 KK |
359 | ebitmap_for_each_positive_bit(sattr, snode, i) { |
360 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
782ebb99 SS |
361 | avkey.source_type = i + 1; |
362 | avkey.target_type = j + 1; | |
363 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
364 | node != NULL; | |
365 | node = avtab_search_node_next(node, avkey.specified)) { | |
366 | if (node->key.specified == AVTAB_ALLOWED) | |
367 | avd->allowed |= node->datum.data; | |
368 | else if (node->key.specified == AVTAB_AUDITALLOW) | |
369 | avd->auditallow |= node->datum.data; | |
370 | else if (node->key.specified == AVTAB_AUDITDENY) | |
371 | avd->auditdeny &= node->datum.data; | |
372 | } | |
1da177e4 | 373 | |
782ebb99 SS |
374 | /* Check conditional av table for additional permissions */ |
375 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); | |
376 | ||
377 | } | |
378 | } | |
1da177e4 LT |
379 | |
380 | /* | |
381 | * Remove any permissions prohibited by a constraint (this includes | |
382 | * the MLS policy). | |
383 | */ | |
384 | constraint = tclass_datum->constraints; | |
385 | while (constraint) { | |
386 | if ((constraint->permissions & (avd->allowed)) && | |
387 | !constraint_expr_eval(scontext, tcontext, NULL, | |
388 | constraint->expr)) { | |
389 | avd->allowed = (avd->allowed) & ~(constraint->permissions); | |
390 | } | |
391 | constraint = constraint->next; | |
392 | } | |
393 | ||
394 | /* | |
395 | * If checking process transition permission and the | |
396 | * role is changing, then check the (current_role, new_role) | |
397 | * pair. | |
398 | */ | |
399 | if (tclass == SECCLASS_PROCESS && | |
400 | (avd->allowed & (PROCESS__TRANSITION | PROCESS__DYNTRANSITION)) && | |
401 | scontext->role != tcontext->role) { | |
402 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
403 | if (scontext->role == ra->role && | |
404 | tcontext->role == ra->new_role) | |
405 | break; | |
406 | } | |
407 | if (!ra) | |
408 | avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION | | |
409 | PROCESS__DYNTRANSITION); | |
410 | } | |
411 | ||
412 | return 0; | |
3f12070e EP |
413 | |
414 | inval_class: | |
415 | printk(KERN_ERR "%s: unrecognized class %d\n", __FUNCTION__, tclass); | |
416 | return -EINVAL; | |
1da177e4 LT |
417 | } |
418 | ||
419 | static int security_validtrans_handle_fail(struct context *ocontext, | |
420 | struct context *ncontext, | |
421 | struct context *tcontext, | |
422 | u16 tclass) | |
423 | { | |
424 | char *o = NULL, *n = NULL, *t = NULL; | |
425 | u32 olen, nlen, tlen; | |
426 | ||
427 | if (context_struct_to_string(ocontext, &o, &olen) < 0) | |
428 | goto out; | |
429 | if (context_struct_to_string(ncontext, &n, &nlen) < 0) | |
430 | goto out; | |
431 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
432 | goto out; | |
9ad9ad38 | 433 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
434 | "security_validate_transition: denied for" |
435 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", | |
436 | o, n, t, policydb.p_class_val_to_name[tclass-1]); | |
437 | out: | |
438 | kfree(o); | |
439 | kfree(n); | |
440 | kfree(t); | |
441 | ||
442 | if (!selinux_enforcing) | |
443 | return 0; | |
444 | return -EPERM; | |
445 | } | |
446 | ||
447 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
448 | u16 tclass) | |
449 | { | |
450 | struct context *ocontext; | |
451 | struct context *ncontext; | |
452 | struct context *tcontext; | |
453 | struct class_datum *tclass_datum; | |
454 | struct constraint_node *constraint; | |
455 | int rc = 0; | |
456 | ||
457 | if (!ss_initialized) | |
458 | return 0; | |
459 | ||
460 | POLICY_RDLOCK; | |
461 | ||
462 | /* | |
463 | * Remap extended Netlink classes for old policy versions. | |
464 | * Do this here rather than socket_type_to_security_class() | |
465 | * in case a newer policy version is loaded, allowing sockets | |
466 | * to remain in the correct class. | |
467 | */ | |
468 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
469 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
470 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
471 | tclass = SECCLASS_NETLINK_SOCKET; | |
472 | ||
473 | if (!tclass || tclass > policydb.p_classes.nprim) { | |
474 | printk(KERN_ERR "security_validate_transition: " | |
475 | "unrecognized class %d\n", tclass); | |
476 | rc = -EINVAL; | |
477 | goto out; | |
478 | } | |
479 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
480 | ||
481 | ocontext = sidtab_search(&sidtab, oldsid); | |
482 | if (!ocontext) { | |
483 | printk(KERN_ERR "security_validate_transition: " | |
484 | " unrecognized SID %d\n", oldsid); | |
485 | rc = -EINVAL; | |
486 | goto out; | |
487 | } | |
488 | ||
489 | ncontext = sidtab_search(&sidtab, newsid); | |
490 | if (!ncontext) { | |
491 | printk(KERN_ERR "security_validate_transition: " | |
492 | " unrecognized SID %d\n", newsid); | |
493 | rc = -EINVAL; | |
494 | goto out; | |
495 | } | |
496 | ||
497 | tcontext = sidtab_search(&sidtab, tasksid); | |
498 | if (!tcontext) { | |
499 | printk(KERN_ERR "security_validate_transition: " | |
500 | " unrecognized SID %d\n", tasksid); | |
501 | rc = -EINVAL; | |
502 | goto out; | |
503 | } | |
504 | ||
505 | constraint = tclass_datum->validatetrans; | |
506 | while (constraint) { | |
507 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
508 | constraint->expr)) { | |
509 | rc = security_validtrans_handle_fail(ocontext, ncontext, | |
510 | tcontext, tclass); | |
511 | goto out; | |
512 | } | |
513 | constraint = constraint->next; | |
514 | } | |
515 | ||
516 | out: | |
517 | POLICY_RDUNLOCK; | |
518 | return rc; | |
519 | } | |
520 | ||
521 | /** | |
522 | * security_compute_av - Compute access vector decisions. | |
523 | * @ssid: source security identifier | |
524 | * @tsid: target security identifier | |
525 | * @tclass: target security class | |
526 | * @requested: requested permissions | |
527 | * @avd: access vector decisions | |
528 | * | |
529 | * Compute a set of access vector decisions based on the | |
530 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
531 | * Return -%EINVAL if any of the parameters are invalid or %0 | |
532 | * if the access vector decisions were computed successfully. | |
533 | */ | |
534 | int security_compute_av(u32 ssid, | |
535 | u32 tsid, | |
536 | u16 tclass, | |
537 | u32 requested, | |
538 | struct av_decision *avd) | |
539 | { | |
540 | struct context *scontext = NULL, *tcontext = NULL; | |
541 | int rc = 0; | |
542 | ||
543 | if (!ss_initialized) { | |
4c443d1b SS |
544 | avd->allowed = 0xffffffff; |
545 | avd->decided = 0xffffffff; | |
1da177e4 LT |
546 | avd->auditallow = 0; |
547 | avd->auditdeny = 0xffffffff; | |
548 | avd->seqno = latest_granting; | |
549 | return 0; | |
550 | } | |
551 | ||
552 | POLICY_RDLOCK; | |
553 | ||
554 | scontext = sidtab_search(&sidtab, ssid); | |
555 | if (!scontext) { | |
556 | printk(KERN_ERR "security_compute_av: unrecognized SID %d\n", | |
557 | ssid); | |
558 | rc = -EINVAL; | |
559 | goto out; | |
560 | } | |
561 | tcontext = sidtab_search(&sidtab, tsid); | |
562 | if (!tcontext) { | |
563 | printk(KERN_ERR "security_compute_av: unrecognized SID %d\n", | |
564 | tsid); | |
565 | rc = -EINVAL; | |
566 | goto out; | |
567 | } | |
568 | ||
569 | rc = context_struct_compute_av(scontext, tcontext, tclass, | |
570 | requested, avd); | |
571 | out: | |
572 | POLICY_RDUNLOCK; | |
573 | return rc; | |
574 | } | |
575 | ||
576 | /* | |
577 | * Write the security context string representation of | |
578 | * the context structure `context' into a dynamically | |
579 | * allocated string of the correct size. Set `*scontext' | |
580 | * to point to this string and set `*scontext_len' to | |
581 | * the length of the string. | |
582 | */ | |
583 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
584 | { | |
585 | char *scontextp; | |
586 | ||
587 | *scontext = NULL; | |
588 | *scontext_len = 0; | |
589 | ||
590 | /* Compute the size of the context. */ | |
591 | *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; | |
592 | *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; | |
593 | *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; | |
594 | *scontext_len += mls_compute_context_len(context); | |
595 | ||
596 | /* Allocate space for the context; caller must free this space. */ | |
597 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
598 | if (!scontextp) { | |
599 | return -ENOMEM; | |
600 | } | |
601 | *scontext = scontextp; | |
602 | ||
603 | /* | |
604 | * Copy the user name, role name and type name into the context. | |
605 | */ | |
606 | sprintf(scontextp, "%s:%s:%s", | |
607 | policydb.p_user_val_to_name[context->user - 1], | |
608 | policydb.p_role_val_to_name[context->role - 1], | |
609 | policydb.p_type_val_to_name[context->type - 1]); | |
610 | scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + | |
611 | 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + | |
612 | 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); | |
613 | ||
614 | mls_sid_to_context(context, &scontextp); | |
615 | ||
616 | *scontextp = 0; | |
617 | ||
618 | return 0; | |
619 | } | |
620 | ||
621 | #include "initial_sid_to_string.h" | |
622 | ||
f0ee2e46 JC |
623 | const char *security_get_initial_sid_context(u32 sid) |
624 | { | |
625 | if (unlikely(sid > SECINITSID_NUM)) | |
626 | return NULL; | |
627 | return initial_sid_to_string[sid]; | |
628 | } | |
629 | ||
1da177e4 LT |
630 | /** |
631 | * security_sid_to_context - Obtain a context for a given SID. | |
632 | * @sid: security identifier, SID | |
633 | * @scontext: security context | |
634 | * @scontext_len: length in bytes | |
635 | * | |
636 | * Write the string representation of the context associated with @sid | |
637 | * into a dynamically allocated string of the correct size. Set @scontext | |
638 | * to point to this string and set @scontext_len to the length of the string. | |
639 | */ | |
640 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
641 | { | |
642 | struct context *context; | |
643 | int rc = 0; | |
644 | ||
4f4acf3a SS |
645 | *scontext = NULL; |
646 | *scontext_len = 0; | |
647 | ||
1da177e4 LT |
648 | if (!ss_initialized) { |
649 | if (sid <= SECINITSID_NUM) { | |
650 | char *scontextp; | |
651 | ||
652 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
653 | scontextp = kmalloc(*scontext_len,GFP_ATOMIC); | |
0cccca06 SH |
654 | if (!scontextp) { |
655 | rc = -ENOMEM; | |
656 | goto out; | |
657 | } | |
1da177e4 LT |
658 | strcpy(scontextp, initial_sid_to_string[sid]); |
659 | *scontext = scontextp; | |
660 | goto out; | |
661 | } | |
662 | printk(KERN_ERR "security_sid_to_context: called before initial " | |
663 | "load_policy on unknown SID %d\n", sid); | |
664 | rc = -EINVAL; | |
665 | goto out; | |
666 | } | |
667 | POLICY_RDLOCK; | |
668 | context = sidtab_search(&sidtab, sid); | |
669 | if (!context) { | |
670 | printk(KERN_ERR "security_sid_to_context: unrecognized SID " | |
671 | "%d\n", sid); | |
672 | rc = -EINVAL; | |
673 | goto out_unlock; | |
674 | } | |
675 | rc = context_struct_to_string(context, scontext, scontext_len); | |
676 | out_unlock: | |
677 | POLICY_RDUNLOCK; | |
678 | out: | |
679 | return rc; | |
680 | ||
681 | } | |
682 | ||
f5c1d5b2 | 683 | static int security_context_to_sid_core(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid) |
1da177e4 LT |
684 | { |
685 | char *scontext2; | |
686 | struct context context; | |
687 | struct role_datum *role; | |
688 | struct type_datum *typdatum; | |
689 | struct user_datum *usrdatum; | |
690 | char *scontextp, *p, oldc; | |
691 | int rc = 0; | |
692 | ||
693 | if (!ss_initialized) { | |
694 | int i; | |
695 | ||
696 | for (i = 1; i < SECINITSID_NUM; i++) { | |
697 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
698 | *sid = i; | |
699 | goto out; | |
700 | } | |
701 | } | |
702 | *sid = SECINITSID_KERNEL; | |
703 | goto out; | |
704 | } | |
705 | *sid = SECSID_NULL; | |
706 | ||
707 | /* Copy the string so that we can modify the copy as we parse it. | |
708 | The string should already by null terminated, but we append a | |
709 | null suffix to the copy to avoid problems with the existing | |
710 | attr package, which doesn't view the null terminator as part | |
711 | of the attribute value. */ | |
712 | scontext2 = kmalloc(scontext_len+1,GFP_KERNEL); | |
713 | if (!scontext2) { | |
714 | rc = -ENOMEM; | |
715 | goto out; | |
716 | } | |
717 | memcpy(scontext2, scontext, scontext_len); | |
718 | scontext2[scontext_len] = 0; | |
719 | ||
720 | context_init(&context); | |
721 | *sid = SECSID_NULL; | |
722 | ||
723 | POLICY_RDLOCK; | |
724 | ||
725 | /* Parse the security context. */ | |
726 | ||
727 | rc = -EINVAL; | |
728 | scontextp = (char *) scontext2; | |
729 | ||
730 | /* Extract the user. */ | |
731 | p = scontextp; | |
732 | while (*p && *p != ':') | |
733 | p++; | |
734 | ||
735 | if (*p == 0) | |
736 | goto out_unlock; | |
737 | ||
738 | *p++ = 0; | |
739 | ||
740 | usrdatum = hashtab_search(policydb.p_users.table, scontextp); | |
741 | if (!usrdatum) | |
742 | goto out_unlock; | |
743 | ||
744 | context.user = usrdatum->value; | |
745 | ||
746 | /* Extract role. */ | |
747 | scontextp = p; | |
748 | while (*p && *p != ':') | |
749 | p++; | |
750 | ||
751 | if (*p == 0) | |
752 | goto out_unlock; | |
753 | ||
754 | *p++ = 0; | |
755 | ||
756 | role = hashtab_search(policydb.p_roles.table, scontextp); | |
757 | if (!role) | |
758 | goto out_unlock; | |
759 | context.role = role->value; | |
760 | ||
761 | /* Extract type. */ | |
762 | scontextp = p; | |
763 | while (*p && *p != ':') | |
764 | p++; | |
765 | oldc = *p; | |
766 | *p++ = 0; | |
767 | ||
768 | typdatum = hashtab_search(policydb.p_types.table, scontextp); | |
769 | if (!typdatum) | |
770 | goto out_unlock; | |
771 | ||
772 | context.type = typdatum->value; | |
773 | ||
f5c1d5b2 | 774 | rc = mls_context_to_sid(oldc, &p, &context, &sidtab, def_sid); |
1da177e4 LT |
775 | if (rc) |
776 | goto out_unlock; | |
777 | ||
778 | if ((p - scontext2) < scontext_len) { | |
779 | rc = -EINVAL; | |
780 | goto out_unlock; | |
781 | } | |
782 | ||
783 | /* Check the validity of the new context. */ | |
784 | if (!policydb_context_isvalid(&policydb, &context)) { | |
785 | rc = -EINVAL; | |
786 | goto out_unlock; | |
787 | } | |
788 | /* Obtain the new sid. */ | |
789 | rc = sidtab_context_to_sid(&sidtab, &context, sid); | |
790 | out_unlock: | |
791 | POLICY_RDUNLOCK; | |
792 | context_destroy(&context); | |
793 | kfree(scontext2); | |
794 | out: | |
795 | return rc; | |
796 | } | |
797 | ||
f5c1d5b2 JM |
798 | /** |
799 | * security_context_to_sid - Obtain a SID for a given security context. | |
800 | * @scontext: security context | |
801 | * @scontext_len: length in bytes | |
802 | * @sid: security identifier, SID | |
803 | * | |
804 | * Obtains a SID associated with the security context that | |
805 | * has the string representation specified by @scontext. | |
806 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
807 | * memory is available, or 0 on success. | |
808 | */ | |
809 | int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid) | |
810 | { | |
811 | return security_context_to_sid_core(scontext, scontext_len, | |
812 | sid, SECSID_NULL); | |
813 | } | |
814 | ||
815 | /** | |
816 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
817 | * falling back to specified default if needed. | |
818 | * | |
819 | * @scontext: security context | |
820 | * @scontext_len: length in bytes | |
821 | * @sid: security identifier, SID | |
d133a960 | 822 | * @def_sid: default SID to assign on error |
f5c1d5b2 JM |
823 | * |
824 | * Obtains a SID associated with the security context that | |
825 | * has the string representation specified by @scontext. | |
826 | * The default SID is passed to the MLS layer to be used to allow | |
827 | * kernel labeling of the MLS field if the MLS field is not present | |
828 | * (for upgrading to MLS without full relabel). | |
829 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
830 | * memory is available, or 0 on success. | |
831 | */ | |
832 | int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid) | |
833 | { | |
834 | return security_context_to_sid_core(scontext, scontext_len, | |
835 | sid, def_sid); | |
836 | } | |
837 | ||
1da177e4 LT |
838 | static int compute_sid_handle_invalid_context( |
839 | struct context *scontext, | |
840 | struct context *tcontext, | |
841 | u16 tclass, | |
842 | struct context *newcontext) | |
843 | { | |
844 | char *s = NULL, *t = NULL, *n = NULL; | |
845 | u32 slen, tlen, nlen; | |
846 | ||
847 | if (context_struct_to_string(scontext, &s, &slen) < 0) | |
848 | goto out; | |
849 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
850 | goto out; | |
851 | if (context_struct_to_string(newcontext, &n, &nlen) < 0) | |
852 | goto out; | |
9ad9ad38 | 853 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
854 | "security_compute_sid: invalid context %s" |
855 | " for scontext=%s" | |
856 | " tcontext=%s" | |
857 | " tclass=%s", | |
858 | n, s, t, policydb.p_class_val_to_name[tclass-1]); | |
859 | out: | |
860 | kfree(s); | |
861 | kfree(t); | |
862 | kfree(n); | |
863 | if (!selinux_enforcing) | |
864 | return 0; | |
865 | return -EACCES; | |
866 | } | |
867 | ||
868 | static int security_compute_sid(u32 ssid, | |
869 | u32 tsid, | |
870 | u16 tclass, | |
871 | u32 specified, | |
872 | u32 *out_sid) | |
873 | { | |
874 | struct context *scontext = NULL, *tcontext = NULL, newcontext; | |
875 | struct role_trans *roletr = NULL; | |
876 | struct avtab_key avkey; | |
877 | struct avtab_datum *avdatum; | |
878 | struct avtab_node *node; | |
1da177e4 LT |
879 | int rc = 0; |
880 | ||
881 | if (!ss_initialized) { | |
882 | switch (tclass) { | |
883 | case SECCLASS_PROCESS: | |
884 | *out_sid = ssid; | |
885 | break; | |
886 | default: | |
887 | *out_sid = tsid; | |
888 | break; | |
889 | } | |
890 | goto out; | |
891 | } | |
892 | ||
851f8a69 VY |
893 | context_init(&newcontext); |
894 | ||
1da177e4 LT |
895 | POLICY_RDLOCK; |
896 | ||
897 | scontext = sidtab_search(&sidtab, ssid); | |
898 | if (!scontext) { | |
899 | printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n", | |
900 | ssid); | |
901 | rc = -EINVAL; | |
902 | goto out_unlock; | |
903 | } | |
904 | tcontext = sidtab_search(&sidtab, tsid); | |
905 | if (!tcontext) { | |
906 | printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n", | |
907 | tsid); | |
908 | rc = -EINVAL; | |
909 | goto out_unlock; | |
910 | } | |
911 | ||
1da177e4 LT |
912 | /* Set the user identity. */ |
913 | switch (specified) { | |
914 | case AVTAB_TRANSITION: | |
915 | case AVTAB_CHANGE: | |
916 | /* Use the process user identity. */ | |
917 | newcontext.user = scontext->user; | |
918 | break; | |
919 | case AVTAB_MEMBER: | |
920 | /* Use the related object owner. */ | |
921 | newcontext.user = tcontext->user; | |
922 | break; | |
923 | } | |
924 | ||
925 | /* Set the role and type to default values. */ | |
926 | switch (tclass) { | |
927 | case SECCLASS_PROCESS: | |
928 | /* Use the current role and type of process. */ | |
929 | newcontext.role = scontext->role; | |
930 | newcontext.type = scontext->type; | |
931 | break; | |
932 | default: | |
933 | /* Use the well-defined object role. */ | |
934 | newcontext.role = OBJECT_R_VAL; | |
935 | /* Use the type of the related object. */ | |
936 | newcontext.type = tcontext->type; | |
937 | } | |
938 | ||
939 | /* Look for a type transition/member/change rule. */ | |
940 | avkey.source_type = scontext->type; | |
941 | avkey.target_type = tcontext->type; | |
942 | avkey.target_class = tclass; | |
782ebb99 SS |
943 | avkey.specified = specified; |
944 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
945 | |
946 | /* If no permanent rule, also check for enabled conditional rules */ | |
947 | if(!avdatum) { | |
782ebb99 | 948 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
1da177e4 | 949 | for (; node != NULL; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 950 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
951 | avdatum = &node->datum; |
952 | break; | |
953 | } | |
954 | } | |
955 | } | |
956 | ||
782ebb99 | 957 | if (avdatum) { |
1da177e4 | 958 | /* Use the type from the type transition/member/change rule. */ |
782ebb99 | 959 | newcontext.type = avdatum->data; |
1da177e4 LT |
960 | } |
961 | ||
962 | /* Check for class-specific changes. */ | |
963 | switch (tclass) { | |
964 | case SECCLASS_PROCESS: | |
965 | if (specified & AVTAB_TRANSITION) { | |
966 | /* Look for a role transition rule. */ | |
967 | for (roletr = policydb.role_tr; roletr; | |
968 | roletr = roletr->next) { | |
969 | if (roletr->role == scontext->role && | |
970 | roletr->type == tcontext->type) { | |
971 | /* Use the role transition rule. */ | |
972 | newcontext.role = roletr->new_role; | |
973 | break; | |
974 | } | |
975 | } | |
976 | } | |
977 | break; | |
978 | default: | |
979 | break; | |
980 | } | |
981 | ||
982 | /* Set the MLS attributes. | |
983 | This is done last because it may allocate memory. */ | |
984 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext); | |
985 | if (rc) | |
986 | goto out_unlock; | |
987 | ||
988 | /* Check the validity of the context. */ | |
989 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
990 | rc = compute_sid_handle_invalid_context(scontext, | |
991 | tcontext, | |
992 | tclass, | |
993 | &newcontext); | |
994 | if (rc) | |
995 | goto out_unlock; | |
996 | } | |
997 | /* Obtain the sid for the context. */ | |
998 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
999 | out_unlock: | |
1000 | POLICY_RDUNLOCK; | |
1001 | context_destroy(&newcontext); | |
1002 | out: | |
1003 | return rc; | |
1004 | } | |
1005 | ||
1006 | /** | |
1007 | * security_transition_sid - Compute the SID for a new subject/object. | |
1008 | * @ssid: source security identifier | |
1009 | * @tsid: target security identifier | |
1010 | * @tclass: target security class | |
1011 | * @out_sid: security identifier for new subject/object | |
1012 | * | |
1013 | * Compute a SID to use for labeling a new subject or object in the | |
1014 | * class @tclass based on a SID pair (@ssid, @tsid). | |
1015 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1016 | * if insufficient memory is available, or %0 if the new SID was | |
1017 | * computed successfully. | |
1018 | */ | |
1019 | int security_transition_sid(u32 ssid, | |
1020 | u32 tsid, | |
1021 | u16 tclass, | |
1022 | u32 *out_sid) | |
1023 | { | |
1024 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid); | |
1025 | } | |
1026 | ||
1027 | /** | |
1028 | * security_member_sid - Compute the SID for member selection. | |
1029 | * @ssid: source security identifier | |
1030 | * @tsid: target security identifier | |
1031 | * @tclass: target security class | |
1032 | * @out_sid: security identifier for selected member | |
1033 | * | |
1034 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1035 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1036 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1037 | * if insufficient memory is available, or %0 if the SID was | |
1038 | * computed successfully. | |
1039 | */ | |
1040 | int security_member_sid(u32 ssid, | |
1041 | u32 tsid, | |
1042 | u16 tclass, | |
1043 | u32 *out_sid) | |
1044 | { | |
1045 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid); | |
1046 | } | |
1047 | ||
1048 | /** | |
1049 | * security_change_sid - Compute the SID for object relabeling. | |
1050 | * @ssid: source security identifier | |
1051 | * @tsid: target security identifier | |
1052 | * @tclass: target security class | |
1053 | * @out_sid: security identifier for selected member | |
1054 | * | |
1055 | * Compute a SID to use for relabeling an object of class @tclass | |
1056 | * based on a SID pair (@ssid, @tsid). | |
1057 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1058 | * if insufficient memory is available, or %0 if the SID was | |
1059 | * computed successfully. | |
1060 | */ | |
1061 | int security_change_sid(u32 ssid, | |
1062 | u32 tsid, | |
1063 | u16 tclass, | |
1064 | u32 *out_sid) | |
1065 | { | |
1066 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid); | |
1067 | } | |
1068 | ||
b94c7e67 CS |
1069 | /* |
1070 | * Verify that each kernel class that is defined in the | |
1071 | * policy is correct | |
1072 | */ | |
1073 | static int validate_classes(struct policydb *p) | |
1074 | { | |
1075 | int i, j; | |
1076 | struct class_datum *cladatum; | |
1077 | struct perm_datum *perdatum; | |
1078 | u32 nprim, tmp, common_pts_len, perm_val, pol_val; | |
1079 | u16 class_val; | |
1080 | const struct selinux_class_perm *kdefs = &selinux_class_perm; | |
1081 | const char *def_class, *def_perm, *pol_class; | |
1082 | struct symtab *perms; | |
1083 | ||
3f12070e EP |
1084 | if (p->allow_unknown) { |
1085 | u32 num_classes = kdefs->cts_len; | |
1086 | p->undefined_perms = kcalloc(num_classes, sizeof(u32), GFP_KERNEL); | |
1087 | if (!p->undefined_perms) | |
1088 | return -ENOMEM; | |
1089 | } | |
1090 | ||
b94c7e67 CS |
1091 | for (i = 1; i < kdefs->cts_len; i++) { |
1092 | def_class = kdefs->class_to_string[i]; | |
a764ae4b SS |
1093 | if (!def_class) |
1094 | continue; | |
b94c7e67 CS |
1095 | if (i > p->p_classes.nprim) { |
1096 | printk(KERN_INFO | |
1097 | "security: class %s not defined in policy\n", | |
1098 | def_class); | |
3f12070e EP |
1099 | if (p->reject_unknown) |
1100 | return -EINVAL; | |
1101 | if (p->allow_unknown) | |
1102 | p->undefined_perms[i-1] = ~0U; | |
b94c7e67 CS |
1103 | continue; |
1104 | } | |
1105 | pol_class = p->p_class_val_to_name[i-1]; | |
1106 | if (strcmp(pol_class, def_class)) { | |
1107 | printk(KERN_ERR | |
1108 | "security: class %d is incorrect, found %s but should be %s\n", | |
1109 | i, pol_class, def_class); | |
1110 | return -EINVAL; | |
1111 | } | |
1112 | } | |
1113 | for (i = 0; i < kdefs->av_pts_len; i++) { | |
1114 | class_val = kdefs->av_perm_to_string[i].tclass; | |
1115 | perm_val = kdefs->av_perm_to_string[i].value; | |
1116 | def_perm = kdefs->av_perm_to_string[i].name; | |
1117 | if (class_val > p->p_classes.nprim) | |
1118 | continue; | |
1119 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1120 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1121 | BUG_ON(!cladatum); | |
1122 | perms = &cladatum->permissions; | |
1123 | nprim = 1 << (perms->nprim - 1); | |
1124 | if (perm_val > nprim) { | |
1125 | printk(KERN_INFO | |
1126 | "security: permission %s in class %s not defined in policy\n", | |
1127 | def_perm, pol_class); | |
3f12070e EP |
1128 | if (p->reject_unknown) |
1129 | return -EINVAL; | |
1130 | if (p->allow_unknown) | |
1131 | p->undefined_perms[class_val-1] |= perm_val; | |
b94c7e67 CS |
1132 | continue; |
1133 | } | |
1134 | perdatum = hashtab_search(perms->table, def_perm); | |
1135 | if (perdatum == NULL) { | |
1136 | printk(KERN_ERR | |
3f12070e | 1137 | "security: permission %s in class %s not found in policy, bad policy\n", |
b94c7e67 CS |
1138 | def_perm, pol_class); |
1139 | return -EINVAL; | |
1140 | } | |
1141 | pol_val = 1 << (perdatum->value - 1); | |
1142 | if (pol_val != perm_val) { | |
1143 | printk(KERN_ERR | |
1144 | "security: permission %s in class %s has incorrect value\n", | |
1145 | def_perm, pol_class); | |
1146 | return -EINVAL; | |
1147 | } | |
1148 | } | |
1149 | for (i = 0; i < kdefs->av_inherit_len; i++) { | |
1150 | class_val = kdefs->av_inherit[i].tclass; | |
1151 | if (class_val > p->p_classes.nprim) | |
1152 | continue; | |
1153 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1154 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1155 | BUG_ON(!cladatum); | |
1156 | if (!cladatum->comdatum) { | |
1157 | printk(KERN_ERR | |
1158 | "security: class %s should have an inherits clause but does not\n", | |
1159 | pol_class); | |
1160 | return -EINVAL; | |
1161 | } | |
1162 | tmp = kdefs->av_inherit[i].common_base; | |
1163 | common_pts_len = 0; | |
1164 | while (!(tmp & 0x01)) { | |
1165 | common_pts_len++; | |
1166 | tmp >>= 1; | |
1167 | } | |
1168 | perms = &cladatum->comdatum->permissions; | |
1169 | for (j = 0; j < common_pts_len; j++) { | |
1170 | def_perm = kdefs->av_inherit[i].common_pts[j]; | |
1171 | if (j >= perms->nprim) { | |
1172 | printk(KERN_INFO | |
1173 | "security: permission %s in class %s not defined in policy\n", | |
1174 | def_perm, pol_class); | |
3f12070e EP |
1175 | if (p->reject_unknown) |
1176 | return -EINVAL; | |
1177 | if (p->allow_unknown) | |
1178 | p->undefined_perms[class_val-1] |= (1 << j); | |
b94c7e67 CS |
1179 | continue; |
1180 | } | |
1181 | perdatum = hashtab_search(perms->table, def_perm); | |
1182 | if (perdatum == NULL) { | |
1183 | printk(KERN_ERR | |
3f12070e | 1184 | "security: permission %s in class %s not found in policy, bad policy\n", |
b94c7e67 CS |
1185 | def_perm, pol_class); |
1186 | return -EINVAL; | |
1187 | } | |
1188 | if (perdatum->value != j + 1) { | |
1189 | printk(KERN_ERR | |
1190 | "security: permission %s in class %s has incorrect value\n", | |
1191 | def_perm, pol_class); | |
1192 | return -EINVAL; | |
1193 | } | |
1194 | } | |
1195 | } | |
1196 | return 0; | |
1197 | } | |
1198 | ||
1da177e4 LT |
1199 | /* Clone the SID into the new SID table. */ |
1200 | static int clone_sid(u32 sid, | |
1201 | struct context *context, | |
1202 | void *arg) | |
1203 | { | |
1204 | struct sidtab *s = arg; | |
1205 | ||
1206 | return sidtab_insert(s, sid, context); | |
1207 | } | |
1208 | ||
1209 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1210 | { | |
1211 | int rc = 0; | |
1212 | ||
1213 | if (selinux_enforcing) { | |
1214 | rc = -EINVAL; | |
1215 | } else { | |
1216 | char *s; | |
1217 | u32 len; | |
1218 | ||
1219 | context_struct_to_string(context, &s, &len); | |
1220 | printk(KERN_ERR "security: context %s is invalid\n", s); | |
1221 | kfree(s); | |
1222 | } | |
1223 | return rc; | |
1224 | } | |
1225 | ||
1226 | struct convert_context_args { | |
1227 | struct policydb *oldp; | |
1228 | struct policydb *newp; | |
1229 | }; | |
1230 | ||
1231 | /* | |
1232 | * Convert the values in the security context | |
1233 | * structure `c' from the values specified | |
1234 | * in the policy `p->oldp' to the values specified | |
1235 | * in the policy `p->newp'. Verify that the | |
1236 | * context is valid under the new policy. | |
1237 | */ | |
1238 | static int convert_context(u32 key, | |
1239 | struct context *c, | |
1240 | void *p) | |
1241 | { | |
1242 | struct convert_context_args *args; | |
1243 | struct context oldc; | |
1244 | struct role_datum *role; | |
1245 | struct type_datum *typdatum; | |
1246 | struct user_datum *usrdatum; | |
1247 | char *s; | |
1248 | u32 len; | |
1249 | int rc; | |
1250 | ||
1251 | args = p; | |
1252 | ||
1253 | rc = context_cpy(&oldc, c); | |
1254 | if (rc) | |
1255 | goto out; | |
1256 | ||
1257 | rc = -EINVAL; | |
1258 | ||
1259 | /* Convert the user. */ | |
1260 | usrdatum = hashtab_search(args->newp->p_users.table, | |
1261 | args->oldp->p_user_val_to_name[c->user - 1]); | |
1262 | if (!usrdatum) { | |
1263 | goto bad; | |
1264 | } | |
1265 | c->user = usrdatum->value; | |
1266 | ||
1267 | /* Convert the role. */ | |
1268 | role = hashtab_search(args->newp->p_roles.table, | |
1269 | args->oldp->p_role_val_to_name[c->role - 1]); | |
1270 | if (!role) { | |
1271 | goto bad; | |
1272 | } | |
1273 | c->role = role->value; | |
1274 | ||
1275 | /* Convert the type. */ | |
1276 | typdatum = hashtab_search(args->newp->p_types.table, | |
1277 | args->oldp->p_type_val_to_name[c->type - 1]); | |
1278 | if (!typdatum) { | |
1279 | goto bad; | |
1280 | } | |
1281 | c->type = typdatum->value; | |
1282 | ||
1283 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1284 | if (rc) | |
1285 | goto bad; | |
1286 | ||
1287 | /* Check the validity of the new context. */ | |
1288 | if (!policydb_context_isvalid(args->newp, c)) { | |
1289 | rc = convert_context_handle_invalid_context(&oldc); | |
1290 | if (rc) | |
1291 | goto bad; | |
1292 | } | |
1293 | ||
1294 | context_destroy(&oldc); | |
1295 | out: | |
1296 | return rc; | |
1297 | bad: | |
1298 | context_struct_to_string(&oldc, &s, &len); | |
1299 | context_destroy(&oldc); | |
1300 | printk(KERN_ERR "security: invalidating context %s\n", s); | |
1301 | kfree(s); | |
1302 | goto out; | |
1303 | } | |
1304 | ||
3bb56b25 PM |
1305 | static void security_load_policycaps(void) |
1306 | { | |
1307 | selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps, | |
1308 | POLICYDB_CAPABILITY_NETPEER); | |
1309 | } | |
1310 | ||
1da177e4 | 1311 | extern void selinux_complete_init(void); |
e900a7d9 | 1312 | static int security_preserve_bools(struct policydb *p); |
1da177e4 LT |
1313 | |
1314 | /** | |
1315 | * security_load_policy - Load a security policy configuration. | |
1316 | * @data: binary policy data | |
1317 | * @len: length of data in bytes | |
1318 | * | |
1319 | * Load a new set of security policy configuration data, | |
1320 | * validate it and convert the SID table as necessary. | |
1321 | * This function will flush the access vector cache after | |
1322 | * loading the new policy. | |
1323 | */ | |
1324 | int security_load_policy(void *data, size_t len) | |
1325 | { | |
1326 | struct policydb oldpolicydb, newpolicydb; | |
1327 | struct sidtab oldsidtab, newsidtab; | |
1328 | struct convert_context_args args; | |
1329 | u32 seqno; | |
1330 | int rc = 0; | |
1331 | struct policy_file file = { data, len }, *fp = &file; | |
1332 | ||
1333 | LOAD_LOCK; | |
1334 | ||
1335 | if (!ss_initialized) { | |
1336 | avtab_cache_init(); | |
1337 | if (policydb_read(&policydb, fp)) { | |
1338 | LOAD_UNLOCK; | |
1339 | avtab_cache_destroy(); | |
1340 | return -EINVAL; | |
1341 | } | |
1342 | if (policydb_load_isids(&policydb, &sidtab)) { | |
1343 | LOAD_UNLOCK; | |
1344 | policydb_destroy(&policydb); | |
1345 | avtab_cache_destroy(); | |
1346 | return -EINVAL; | |
1347 | } | |
b94c7e67 CS |
1348 | /* Verify that the kernel defined classes are correct. */ |
1349 | if (validate_classes(&policydb)) { | |
1350 | printk(KERN_ERR | |
1351 | "security: the definition of a class is incorrect\n"); | |
1352 | LOAD_UNLOCK; | |
1353 | sidtab_destroy(&sidtab); | |
1354 | policydb_destroy(&policydb); | |
1355 | avtab_cache_destroy(); | |
1356 | return -EINVAL; | |
1357 | } | |
3bb56b25 | 1358 | security_load_policycaps(); |
1da177e4 LT |
1359 | policydb_loaded_version = policydb.policyvers; |
1360 | ss_initialized = 1; | |
4c443d1b | 1361 | seqno = ++latest_granting; |
1da177e4 LT |
1362 | LOAD_UNLOCK; |
1363 | selinux_complete_init(); | |
4c443d1b SS |
1364 | avc_ss_reset(seqno); |
1365 | selnl_notify_policyload(seqno); | |
7420ed23 | 1366 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1367 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1368 | return 0; |
1369 | } | |
1370 | ||
1371 | #if 0 | |
1372 | sidtab_hash_eval(&sidtab, "sids"); | |
1373 | #endif | |
1374 | ||
1375 | if (policydb_read(&newpolicydb, fp)) { | |
1376 | LOAD_UNLOCK; | |
1377 | return -EINVAL; | |
1378 | } | |
1379 | ||
1380 | sidtab_init(&newsidtab); | |
1381 | ||
b94c7e67 CS |
1382 | /* Verify that the kernel defined classes are correct. */ |
1383 | if (validate_classes(&newpolicydb)) { | |
1384 | printk(KERN_ERR | |
1385 | "security: the definition of a class is incorrect\n"); | |
1386 | rc = -EINVAL; | |
1387 | goto err; | |
1388 | } | |
1389 | ||
e900a7d9 SS |
1390 | rc = security_preserve_bools(&newpolicydb); |
1391 | if (rc) { | |
1392 | printk(KERN_ERR "security: unable to preserve booleans\n"); | |
1393 | goto err; | |
1394 | } | |
1395 | ||
1da177e4 LT |
1396 | /* Clone the SID table. */ |
1397 | sidtab_shutdown(&sidtab); | |
1398 | if (sidtab_map(&sidtab, clone_sid, &newsidtab)) { | |
1399 | rc = -ENOMEM; | |
1400 | goto err; | |
1401 | } | |
1402 | ||
1403 | /* Convert the internal representations of contexts | |
1404 | in the new SID table and remove invalid SIDs. */ | |
1405 | args.oldp = &policydb; | |
1406 | args.newp = &newpolicydb; | |
1407 | sidtab_map_remove_on_error(&newsidtab, convert_context, &args); | |
1408 | ||
1409 | /* Save the old policydb and SID table to free later. */ | |
1410 | memcpy(&oldpolicydb, &policydb, sizeof policydb); | |
1411 | sidtab_set(&oldsidtab, &sidtab); | |
1412 | ||
1413 | /* Install the new policydb and SID table. */ | |
1414 | POLICY_WRLOCK; | |
1415 | memcpy(&policydb, &newpolicydb, sizeof policydb); | |
1416 | sidtab_set(&sidtab, &newsidtab); | |
3bb56b25 | 1417 | security_load_policycaps(); |
1da177e4 LT |
1418 | seqno = ++latest_granting; |
1419 | policydb_loaded_version = policydb.policyvers; | |
1420 | POLICY_WRUNLOCK; | |
1421 | LOAD_UNLOCK; | |
1422 | ||
1423 | /* Free the old policydb and SID table. */ | |
1424 | policydb_destroy(&oldpolicydb); | |
1425 | sidtab_destroy(&oldsidtab); | |
1426 | ||
1427 | avc_ss_reset(seqno); | |
1428 | selnl_notify_policyload(seqno); | |
7420ed23 | 1429 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1430 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1431 | |
1432 | return 0; | |
1433 | ||
1434 | err: | |
1435 | LOAD_UNLOCK; | |
1436 | sidtab_destroy(&newsidtab); | |
1437 | policydb_destroy(&newpolicydb); | |
1438 | return rc; | |
1439 | ||
1440 | } | |
1441 | ||
1442 | /** | |
1443 | * security_port_sid - Obtain the SID for a port. | |
1444 | * @domain: communication domain aka address family | |
1445 | * @type: socket type | |
1446 | * @protocol: protocol number | |
1447 | * @port: port number | |
1448 | * @out_sid: security identifier | |
1449 | */ | |
1450 | int security_port_sid(u16 domain, | |
1451 | u16 type, | |
1452 | u8 protocol, | |
1453 | u16 port, | |
1454 | u32 *out_sid) | |
1455 | { | |
1456 | struct ocontext *c; | |
1457 | int rc = 0; | |
1458 | ||
1459 | POLICY_RDLOCK; | |
1460 | ||
1461 | c = policydb.ocontexts[OCON_PORT]; | |
1462 | while (c) { | |
1463 | if (c->u.port.protocol == protocol && | |
1464 | c->u.port.low_port <= port && | |
1465 | c->u.port.high_port >= port) | |
1466 | break; | |
1467 | c = c->next; | |
1468 | } | |
1469 | ||
1470 | if (c) { | |
1471 | if (!c->sid[0]) { | |
1472 | rc = sidtab_context_to_sid(&sidtab, | |
1473 | &c->context[0], | |
1474 | &c->sid[0]); | |
1475 | if (rc) | |
1476 | goto out; | |
1477 | } | |
1478 | *out_sid = c->sid[0]; | |
1479 | } else { | |
1480 | *out_sid = SECINITSID_PORT; | |
1481 | } | |
1482 | ||
1483 | out: | |
1484 | POLICY_RDUNLOCK; | |
1485 | return rc; | |
1486 | } | |
1487 | ||
1488 | /** | |
1489 | * security_netif_sid - Obtain the SID for a network interface. | |
1490 | * @name: interface name | |
1491 | * @if_sid: interface SID | |
1da177e4 | 1492 | */ |
e8bfdb9d | 1493 | int security_netif_sid(char *name, u32 *if_sid) |
1da177e4 LT |
1494 | { |
1495 | int rc = 0; | |
1496 | struct ocontext *c; | |
1497 | ||
1498 | POLICY_RDLOCK; | |
1499 | ||
1500 | c = policydb.ocontexts[OCON_NETIF]; | |
1501 | while (c) { | |
1502 | if (strcmp(name, c->u.name) == 0) | |
1503 | break; | |
1504 | c = c->next; | |
1505 | } | |
1506 | ||
1507 | if (c) { | |
1508 | if (!c->sid[0] || !c->sid[1]) { | |
1509 | rc = sidtab_context_to_sid(&sidtab, | |
1510 | &c->context[0], | |
1511 | &c->sid[0]); | |
1512 | if (rc) | |
1513 | goto out; | |
1514 | rc = sidtab_context_to_sid(&sidtab, | |
1515 | &c->context[1], | |
1516 | &c->sid[1]); | |
1517 | if (rc) | |
1518 | goto out; | |
1519 | } | |
1520 | *if_sid = c->sid[0]; | |
e8bfdb9d | 1521 | } else |
1da177e4 | 1522 | *if_sid = SECINITSID_NETIF; |
1da177e4 LT |
1523 | |
1524 | out: | |
1525 | POLICY_RDUNLOCK; | |
1526 | return rc; | |
1527 | } | |
1528 | ||
1529 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
1530 | { | |
1531 | int i, fail = 0; | |
1532 | ||
1533 | for(i = 0; i < 4; i++) | |
1534 | if(addr[i] != (input[i] & mask[i])) { | |
1535 | fail = 1; | |
1536 | break; | |
1537 | } | |
1538 | ||
1539 | return !fail; | |
1540 | } | |
1541 | ||
1542 | /** | |
1543 | * security_node_sid - Obtain the SID for a node (host). | |
1544 | * @domain: communication domain aka address family | |
1545 | * @addrp: address | |
1546 | * @addrlen: address length in bytes | |
1547 | * @out_sid: security identifier | |
1548 | */ | |
1549 | int security_node_sid(u16 domain, | |
1550 | void *addrp, | |
1551 | u32 addrlen, | |
1552 | u32 *out_sid) | |
1553 | { | |
1554 | int rc = 0; | |
1555 | struct ocontext *c; | |
1556 | ||
1557 | POLICY_RDLOCK; | |
1558 | ||
1559 | switch (domain) { | |
1560 | case AF_INET: { | |
1561 | u32 addr; | |
1562 | ||
1563 | if (addrlen != sizeof(u32)) { | |
1564 | rc = -EINVAL; | |
1565 | goto out; | |
1566 | } | |
1567 | ||
1568 | addr = *((u32 *)addrp); | |
1569 | ||
1570 | c = policydb.ocontexts[OCON_NODE]; | |
1571 | while (c) { | |
1572 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
1573 | break; | |
1574 | c = c->next; | |
1575 | } | |
1576 | break; | |
1577 | } | |
1578 | ||
1579 | case AF_INET6: | |
1580 | if (addrlen != sizeof(u64) * 2) { | |
1581 | rc = -EINVAL; | |
1582 | goto out; | |
1583 | } | |
1584 | c = policydb.ocontexts[OCON_NODE6]; | |
1585 | while (c) { | |
1586 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
1587 | c->u.node6.mask)) | |
1588 | break; | |
1589 | c = c->next; | |
1590 | } | |
1591 | break; | |
1592 | ||
1593 | default: | |
1594 | *out_sid = SECINITSID_NODE; | |
1595 | goto out; | |
1596 | } | |
1597 | ||
1598 | if (c) { | |
1599 | if (!c->sid[0]) { | |
1600 | rc = sidtab_context_to_sid(&sidtab, | |
1601 | &c->context[0], | |
1602 | &c->sid[0]); | |
1603 | if (rc) | |
1604 | goto out; | |
1605 | } | |
1606 | *out_sid = c->sid[0]; | |
1607 | } else { | |
1608 | *out_sid = SECINITSID_NODE; | |
1609 | } | |
1610 | ||
1611 | out: | |
1612 | POLICY_RDUNLOCK; | |
1613 | return rc; | |
1614 | } | |
1615 | ||
1616 | #define SIDS_NEL 25 | |
1617 | ||
1618 | /** | |
1619 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
1620 | * @fromsid: starting SID | |
1621 | * @username: username | |
1622 | * @sids: array of reachable SIDs for user | |
1623 | * @nel: number of elements in @sids | |
1624 | * | |
1625 | * Generate the set of SIDs for legal security contexts | |
1626 | * for a given user that can be reached by @fromsid. | |
1627 | * Set *@sids to point to a dynamically allocated | |
1628 | * array containing the set of SIDs. Set *@nel to the | |
1629 | * number of elements in the array. | |
1630 | */ | |
1631 | ||
1632 | int security_get_user_sids(u32 fromsid, | |
1633 | char *username, | |
1634 | u32 **sids, | |
1635 | u32 *nel) | |
1636 | { | |
1637 | struct context *fromcon, usercon; | |
2c3c05db | 1638 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
1639 | u32 mynel = 0, maxnel = SIDS_NEL; |
1640 | struct user_datum *user; | |
1641 | struct role_datum *role; | |
782ebb99 | 1642 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
1643 | int rc = 0, i, j; |
1644 | ||
2c3c05db SS |
1645 | *sids = NULL; |
1646 | *nel = 0; | |
1647 | ||
1648 | if (!ss_initialized) | |
1da177e4 | 1649 | goto out; |
1da177e4 LT |
1650 | |
1651 | POLICY_RDLOCK; | |
1652 | ||
1653 | fromcon = sidtab_search(&sidtab, fromsid); | |
1654 | if (!fromcon) { | |
1655 | rc = -EINVAL; | |
1656 | goto out_unlock; | |
1657 | } | |
1658 | ||
1659 | user = hashtab_search(policydb.p_users.table, username); | |
1660 | if (!user) { | |
1661 | rc = -EINVAL; | |
1662 | goto out_unlock; | |
1663 | } | |
1664 | usercon.user = user->value; | |
1665 | ||
89d155ef | 1666 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
1da177e4 LT |
1667 | if (!mysids) { |
1668 | rc = -ENOMEM; | |
1669 | goto out_unlock; | |
1670 | } | |
1da177e4 | 1671 | |
9fe79ad1 | 1672 | ebitmap_for_each_positive_bit(&user->roles, rnode, i) { |
1da177e4 LT |
1673 | role = policydb.role_val_to_struct[i]; |
1674 | usercon.role = i+1; | |
9fe79ad1 | 1675 | ebitmap_for_each_positive_bit(&role->types, tnode, j) { |
1da177e4 LT |
1676 | usercon.type = j+1; |
1677 | ||
1678 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
1679 | continue; | |
1680 | ||
1da177e4 | 1681 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
2c3c05db | 1682 | if (rc) |
1da177e4 | 1683 | goto out_unlock; |
1da177e4 LT |
1684 | if (mynel < maxnel) { |
1685 | mysids[mynel++] = sid; | |
1686 | } else { | |
1687 | maxnel += SIDS_NEL; | |
89d155ef | 1688 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
1da177e4 LT |
1689 | if (!mysids2) { |
1690 | rc = -ENOMEM; | |
1da177e4 LT |
1691 | goto out_unlock; |
1692 | } | |
1da177e4 LT |
1693 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
1694 | kfree(mysids); | |
1695 | mysids = mysids2; | |
1696 | mysids[mynel++] = sid; | |
1697 | } | |
1698 | } | |
1699 | } | |
1700 | ||
1da177e4 LT |
1701 | out_unlock: |
1702 | POLICY_RDUNLOCK; | |
2c3c05db SS |
1703 | if (rc || !mynel) { |
1704 | kfree(mysids); | |
1705 | goto out; | |
1706 | } | |
1707 | ||
1708 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); | |
1709 | if (!mysids2) { | |
1710 | rc = -ENOMEM; | |
1711 | kfree(mysids); | |
1712 | goto out; | |
1713 | } | |
1714 | for (i = 0, j = 0; i < mynel; i++) { | |
1715 | rc = avc_has_perm_noaudit(fromsid, mysids[i], | |
1716 | SECCLASS_PROCESS, | |
1717 | PROCESS__TRANSITION, AVC_STRICT, | |
1718 | NULL); | |
1719 | if (!rc) | |
1720 | mysids2[j++] = mysids[i]; | |
1721 | cond_resched(); | |
1722 | } | |
1723 | rc = 0; | |
1724 | kfree(mysids); | |
1725 | *sids = mysids2; | |
1726 | *nel = j; | |
1da177e4 LT |
1727 | out: |
1728 | return rc; | |
1729 | } | |
1730 | ||
1731 | /** | |
1732 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
1733 | * @fstype: filesystem type | |
1734 | * @path: path from root of mount | |
1735 | * @sclass: file security class | |
1736 | * @sid: SID for path | |
1737 | * | |
1738 | * Obtain a SID to use for a file in a filesystem that | |
1739 | * cannot support xattr or use a fixed labeling behavior like | |
1740 | * transition SIDs or task SIDs. | |
1741 | */ | |
1742 | int security_genfs_sid(const char *fstype, | |
1743 | char *path, | |
1744 | u16 sclass, | |
1745 | u32 *sid) | |
1746 | { | |
1747 | int len; | |
1748 | struct genfs *genfs; | |
1749 | struct ocontext *c; | |
1750 | int rc = 0, cmp = 0; | |
1751 | ||
b1aa5301 SS |
1752 | while (path[0] == '/' && path[1] == '/') |
1753 | path++; | |
1754 | ||
1da177e4 LT |
1755 | POLICY_RDLOCK; |
1756 | ||
1757 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { | |
1758 | cmp = strcmp(fstype, genfs->fstype); | |
1759 | if (cmp <= 0) | |
1760 | break; | |
1761 | } | |
1762 | ||
1763 | if (!genfs || cmp) { | |
1764 | *sid = SECINITSID_UNLABELED; | |
1765 | rc = -ENOENT; | |
1766 | goto out; | |
1767 | } | |
1768 | ||
1769 | for (c = genfs->head; c; c = c->next) { | |
1770 | len = strlen(c->u.name); | |
1771 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
1772 | (strncmp(c->u.name, path, len) == 0)) | |
1773 | break; | |
1774 | } | |
1775 | ||
1776 | if (!c) { | |
1777 | *sid = SECINITSID_UNLABELED; | |
1778 | rc = -ENOENT; | |
1779 | goto out; | |
1780 | } | |
1781 | ||
1782 | if (!c->sid[0]) { | |
1783 | rc = sidtab_context_to_sid(&sidtab, | |
1784 | &c->context[0], | |
1785 | &c->sid[0]); | |
1786 | if (rc) | |
1787 | goto out; | |
1788 | } | |
1789 | ||
1790 | *sid = c->sid[0]; | |
1791 | out: | |
1792 | POLICY_RDUNLOCK; | |
1793 | return rc; | |
1794 | } | |
1795 | ||
1796 | /** | |
1797 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
1798 | * @fstype: filesystem type | |
1799 | * @behavior: labeling behavior | |
1800 | * @sid: SID for filesystem (superblock) | |
1801 | */ | |
1802 | int security_fs_use( | |
1803 | const char *fstype, | |
1804 | unsigned int *behavior, | |
1805 | u32 *sid) | |
1806 | { | |
1807 | int rc = 0; | |
1808 | struct ocontext *c; | |
1809 | ||
1810 | POLICY_RDLOCK; | |
1811 | ||
1812 | c = policydb.ocontexts[OCON_FSUSE]; | |
1813 | while (c) { | |
1814 | if (strcmp(fstype, c->u.name) == 0) | |
1815 | break; | |
1816 | c = c->next; | |
1817 | } | |
1818 | ||
1819 | if (c) { | |
1820 | *behavior = c->v.behavior; | |
1821 | if (!c->sid[0]) { | |
1822 | rc = sidtab_context_to_sid(&sidtab, | |
1823 | &c->context[0], | |
1824 | &c->sid[0]); | |
1825 | if (rc) | |
1826 | goto out; | |
1827 | } | |
1828 | *sid = c->sid[0]; | |
1829 | } else { | |
1830 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); | |
1831 | if (rc) { | |
1832 | *behavior = SECURITY_FS_USE_NONE; | |
1833 | rc = 0; | |
1834 | } else { | |
1835 | *behavior = SECURITY_FS_USE_GENFS; | |
1836 | } | |
1837 | } | |
1838 | ||
1839 | out: | |
1840 | POLICY_RDUNLOCK; | |
1841 | return rc; | |
1842 | } | |
1843 | ||
1844 | int security_get_bools(int *len, char ***names, int **values) | |
1845 | { | |
1846 | int i, rc = -ENOMEM; | |
1847 | ||
1848 | POLICY_RDLOCK; | |
1849 | *names = NULL; | |
1850 | *values = NULL; | |
1851 | ||
1852 | *len = policydb.p_bools.nprim; | |
1853 | if (!*len) { | |
1854 | rc = 0; | |
1855 | goto out; | |
1856 | } | |
1857 | ||
e0795cf4 | 1858 | *names = kcalloc(*len, sizeof(char*), GFP_ATOMIC); |
1da177e4 LT |
1859 | if (!*names) |
1860 | goto err; | |
1da177e4 | 1861 | |
e0795cf4 | 1862 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); |
1da177e4 LT |
1863 | if (!*values) |
1864 | goto err; | |
1865 | ||
1866 | for (i = 0; i < *len; i++) { | |
1867 | size_t name_len; | |
1868 | (*values)[i] = policydb.bool_val_to_struct[i]->state; | |
1869 | name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; | |
e0795cf4 | 1870 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); |
1da177e4 LT |
1871 | if (!(*names)[i]) |
1872 | goto err; | |
1873 | strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); | |
1874 | (*names)[i][name_len - 1] = 0; | |
1875 | } | |
1876 | rc = 0; | |
1877 | out: | |
1878 | POLICY_RDUNLOCK; | |
1879 | return rc; | |
1880 | err: | |
1881 | if (*names) { | |
1882 | for (i = 0; i < *len; i++) | |
9a5f04bf | 1883 | kfree((*names)[i]); |
1da177e4 | 1884 | } |
9a5f04bf | 1885 | kfree(*values); |
1da177e4 LT |
1886 | goto out; |
1887 | } | |
1888 | ||
1889 | ||
1890 | int security_set_bools(int len, int *values) | |
1891 | { | |
1892 | int i, rc = 0; | |
1893 | int lenp, seqno = 0; | |
1894 | struct cond_node *cur; | |
1895 | ||
1896 | POLICY_WRLOCK; | |
1897 | ||
1898 | lenp = policydb.p_bools.nprim; | |
1899 | if (len != lenp) { | |
1900 | rc = -EFAULT; | |
1901 | goto out; | |
1902 | } | |
1903 | ||
1da177e4 | 1904 | for (i = 0; i < len; i++) { |
af601e46 SG |
1905 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
1906 | audit_log(current->audit_context, GFP_ATOMIC, | |
1907 | AUDIT_MAC_CONFIG_CHANGE, | |
1908 | "bool=%s val=%d old_val=%d auid=%u", | |
1909 | policydb.p_bool_val_to_name[i], | |
1910 | !!values[i], | |
1911 | policydb.bool_val_to_struct[i]->state, | |
1912 | audit_get_loginuid(current->audit_context)); | |
1913 | } | |
1da177e4 LT |
1914 | if (values[i]) { |
1915 | policydb.bool_val_to_struct[i]->state = 1; | |
1916 | } else { | |
1917 | policydb.bool_val_to_struct[i]->state = 0; | |
1918 | } | |
1da177e4 | 1919 | } |
1da177e4 LT |
1920 | |
1921 | for (cur = policydb.cond_list; cur != NULL; cur = cur->next) { | |
1922 | rc = evaluate_cond_node(&policydb, cur); | |
1923 | if (rc) | |
1924 | goto out; | |
1925 | } | |
1926 | ||
1927 | seqno = ++latest_granting; | |
1928 | ||
1929 | out: | |
1930 | POLICY_WRUNLOCK; | |
1931 | if (!rc) { | |
1932 | avc_ss_reset(seqno); | |
1933 | selnl_notify_policyload(seqno); | |
342a0cff | 1934 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1935 | } |
1936 | return rc; | |
1937 | } | |
1938 | ||
1939 | int security_get_bool_value(int bool) | |
1940 | { | |
1941 | int rc = 0; | |
1942 | int len; | |
1943 | ||
1944 | POLICY_RDLOCK; | |
1945 | ||
1946 | len = policydb.p_bools.nprim; | |
1947 | if (bool >= len) { | |
1948 | rc = -EFAULT; | |
1949 | goto out; | |
1950 | } | |
1951 | ||
1952 | rc = policydb.bool_val_to_struct[bool]->state; | |
1953 | out: | |
1954 | POLICY_RDUNLOCK; | |
1955 | return rc; | |
1956 | } | |
376bd9cb | 1957 | |
e900a7d9 SS |
1958 | static int security_preserve_bools(struct policydb *p) |
1959 | { | |
1960 | int rc, nbools = 0, *bvalues = NULL, i; | |
1961 | char **bnames = NULL; | |
1962 | struct cond_bool_datum *booldatum; | |
1963 | struct cond_node *cur; | |
1964 | ||
1965 | rc = security_get_bools(&nbools, &bnames, &bvalues); | |
1966 | if (rc) | |
1967 | goto out; | |
1968 | for (i = 0; i < nbools; i++) { | |
1969 | booldatum = hashtab_search(p->p_bools.table, bnames[i]); | |
1970 | if (booldatum) | |
1971 | booldatum->state = bvalues[i]; | |
1972 | } | |
1973 | for (cur = p->cond_list; cur != NULL; cur = cur->next) { | |
1974 | rc = evaluate_cond_node(p, cur); | |
1975 | if (rc) | |
1976 | goto out; | |
1977 | } | |
1978 | ||
1979 | out: | |
1980 | if (bnames) { | |
1981 | for (i = 0; i < nbools; i++) | |
1982 | kfree(bnames[i]); | |
1983 | } | |
1984 | kfree(bnames); | |
1985 | kfree(bvalues); | |
1986 | return rc; | |
1987 | } | |
1988 | ||
08554d6b VY |
1989 | /* |
1990 | * security_sid_mls_copy() - computes a new sid based on the given | |
1991 | * sid and the mls portion of mls_sid. | |
1992 | */ | |
1993 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
1994 | { | |
1995 | struct context *context1; | |
1996 | struct context *context2; | |
1997 | struct context newcon; | |
1998 | char *s; | |
1999 | u32 len; | |
2000 | int rc = 0; | |
2001 | ||
4eb327b5 | 2002 | if (!ss_initialized || !selinux_mls_enabled) { |
08554d6b VY |
2003 | *new_sid = sid; |
2004 | goto out; | |
2005 | } | |
2006 | ||
2007 | context_init(&newcon); | |
2008 | ||
2009 | POLICY_RDLOCK; | |
2010 | context1 = sidtab_search(&sidtab, sid); | |
2011 | if (!context1) { | |
2012 | printk(KERN_ERR "security_sid_mls_copy: unrecognized SID " | |
2013 | "%d\n", sid); | |
2014 | rc = -EINVAL; | |
2015 | goto out_unlock; | |
2016 | } | |
2017 | ||
2018 | context2 = sidtab_search(&sidtab, mls_sid); | |
2019 | if (!context2) { | |
2020 | printk(KERN_ERR "security_sid_mls_copy: unrecognized SID " | |
2021 | "%d\n", mls_sid); | |
2022 | rc = -EINVAL; | |
2023 | goto out_unlock; | |
2024 | } | |
2025 | ||
2026 | newcon.user = context1->user; | |
2027 | newcon.role = context1->role; | |
2028 | newcon.type = context1->type; | |
0efc61ea | 2029 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
2030 | if (rc) |
2031 | goto out_unlock; | |
2032 | ||
08554d6b VY |
2033 | /* Check the validity of the new context. */ |
2034 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
2035 | rc = convert_context_handle_invalid_context(&newcon); | |
2036 | if (rc) | |
2037 | goto bad; | |
2038 | } | |
2039 | ||
2040 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
2041 | goto out_unlock; | |
2042 | ||
2043 | bad: | |
2044 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
2045 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2046 | "security_sid_mls_copy: invalid context %s", s); | |
2047 | kfree(s); | |
2048 | } | |
2049 | ||
2050 | out_unlock: | |
2051 | POLICY_RDUNLOCK; | |
2052 | context_destroy(&newcon); | |
2053 | out: | |
2054 | return rc; | |
2055 | } | |
2056 | ||
220deb96 PM |
2057 | /** |
2058 | * security_net_peersid_resolve - Compare and resolve two network peer SIDs | |
2059 | * @nlbl_sid: NetLabel SID | |
2060 | * @nlbl_type: NetLabel labeling protocol type | |
2061 | * @xfrm_sid: XFRM SID | |
2062 | * | |
2063 | * Description: | |
2064 | * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be | |
2065 | * resolved into a single SID it is returned via @peer_sid and the function | |
2066 | * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function | |
2067 | * returns a negative value. A table summarizing the behavior is below: | |
2068 | * | |
2069 | * | function return | @sid | |
2070 | * ------------------------------+-----------------+----------------- | |
2071 | * no peer labels | 0 | SECSID_NULL | |
2072 | * single peer label | 0 | <peer_label> | |
2073 | * multiple, consistent labels | 0 | <peer_label> | |
2074 | * multiple, inconsistent labels | -<errno> | SECSID_NULL | |
2075 | * | |
2076 | */ | |
2077 | int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, | |
2078 | u32 xfrm_sid, | |
2079 | u32 *peer_sid) | |
2080 | { | |
2081 | int rc; | |
2082 | struct context *nlbl_ctx; | |
2083 | struct context *xfrm_ctx; | |
2084 | ||
2085 | /* handle the common (which also happens to be the set of easy) cases | |
2086 | * right away, these two if statements catch everything involving a | |
2087 | * single or absent peer SID/label */ | |
2088 | if (xfrm_sid == SECSID_NULL) { | |
2089 | *peer_sid = nlbl_sid; | |
2090 | return 0; | |
2091 | } | |
2092 | /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label | |
2093 | * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label | |
2094 | * is present */ | |
2095 | if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { | |
2096 | *peer_sid = xfrm_sid; | |
2097 | return 0; | |
2098 | } | |
2099 | ||
2100 | /* we don't need to check ss_initialized here since the only way both | |
2101 | * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the | |
2102 | * security server was initialized and ss_initialized was true */ | |
2103 | if (!selinux_mls_enabled) { | |
2104 | *peer_sid = SECSID_NULL; | |
2105 | return 0; | |
2106 | } | |
2107 | ||
2108 | POLICY_RDLOCK; | |
2109 | ||
2110 | nlbl_ctx = sidtab_search(&sidtab, nlbl_sid); | |
2111 | if (!nlbl_ctx) { | |
2112 | printk(KERN_ERR | |
2113 | "security_sid_mls_cmp: unrecognized SID %d\n", | |
2114 | nlbl_sid); | |
2115 | rc = -EINVAL; | |
2116 | goto out_slowpath; | |
2117 | } | |
2118 | xfrm_ctx = sidtab_search(&sidtab, xfrm_sid); | |
2119 | if (!xfrm_ctx) { | |
2120 | printk(KERN_ERR | |
2121 | "security_sid_mls_cmp: unrecognized SID %d\n", | |
2122 | xfrm_sid); | |
2123 | rc = -EINVAL; | |
2124 | goto out_slowpath; | |
2125 | } | |
2126 | rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); | |
2127 | ||
2128 | out_slowpath: | |
2129 | POLICY_RDUNLOCK; | |
2130 | if (rc == 0) | |
2131 | /* at present NetLabel SIDs/labels really only carry MLS | |
2132 | * information so if the MLS portion of the NetLabel SID | |
2133 | * matches the MLS portion of the labeled XFRM SID/label | |
2134 | * then pass along the XFRM SID as it is the most | |
2135 | * expressive */ | |
2136 | *peer_sid = xfrm_sid; | |
2137 | else | |
2138 | *peer_sid = SECSID_NULL; | |
2139 | return rc; | |
2140 | } | |
2141 | ||
55fcf09b CP |
2142 | static int get_classes_callback(void *k, void *d, void *args) |
2143 | { | |
2144 | struct class_datum *datum = d; | |
2145 | char *name = k, **classes = args; | |
2146 | int value = datum->value - 1; | |
2147 | ||
2148 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
2149 | if (!classes[value]) | |
2150 | return -ENOMEM; | |
2151 | ||
2152 | return 0; | |
2153 | } | |
2154 | ||
2155 | int security_get_classes(char ***classes, int *nclasses) | |
2156 | { | |
2157 | int rc = -ENOMEM; | |
2158 | ||
2159 | POLICY_RDLOCK; | |
2160 | ||
2161 | *nclasses = policydb.p_classes.nprim; | |
2162 | *classes = kcalloc(*nclasses, sizeof(*classes), GFP_ATOMIC); | |
2163 | if (!*classes) | |
2164 | goto out; | |
2165 | ||
2166 | rc = hashtab_map(policydb.p_classes.table, get_classes_callback, | |
2167 | *classes); | |
2168 | if (rc < 0) { | |
2169 | int i; | |
2170 | for (i = 0; i < *nclasses; i++) | |
2171 | kfree((*classes)[i]); | |
2172 | kfree(*classes); | |
2173 | } | |
2174 | ||
2175 | out: | |
2176 | POLICY_RDUNLOCK; | |
2177 | return rc; | |
2178 | } | |
2179 | ||
2180 | static int get_permissions_callback(void *k, void *d, void *args) | |
2181 | { | |
2182 | struct perm_datum *datum = d; | |
2183 | char *name = k, **perms = args; | |
2184 | int value = datum->value - 1; | |
2185 | ||
2186 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
2187 | if (!perms[value]) | |
2188 | return -ENOMEM; | |
2189 | ||
2190 | return 0; | |
2191 | } | |
2192 | ||
2193 | int security_get_permissions(char *class, char ***perms, int *nperms) | |
2194 | { | |
2195 | int rc = -ENOMEM, i; | |
2196 | struct class_datum *match; | |
2197 | ||
2198 | POLICY_RDLOCK; | |
2199 | ||
2200 | match = hashtab_search(policydb.p_classes.table, class); | |
2201 | if (!match) { | |
2202 | printk(KERN_ERR "%s: unrecognized class %s\n", | |
2203 | __FUNCTION__, class); | |
2204 | rc = -EINVAL; | |
2205 | goto out; | |
2206 | } | |
2207 | ||
2208 | *nperms = match->permissions.nprim; | |
2209 | *perms = kcalloc(*nperms, sizeof(*perms), GFP_ATOMIC); | |
2210 | if (!*perms) | |
2211 | goto out; | |
2212 | ||
2213 | if (match->comdatum) { | |
2214 | rc = hashtab_map(match->comdatum->permissions.table, | |
2215 | get_permissions_callback, *perms); | |
2216 | if (rc < 0) | |
2217 | goto err; | |
2218 | } | |
2219 | ||
2220 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
2221 | *perms); | |
2222 | if (rc < 0) | |
2223 | goto err; | |
2224 | ||
2225 | out: | |
2226 | POLICY_RDUNLOCK; | |
2227 | return rc; | |
2228 | ||
2229 | err: | |
2230 | POLICY_RDUNLOCK; | |
2231 | for (i = 0; i < *nperms; i++) | |
2232 | kfree((*perms)[i]); | |
2233 | kfree(*perms); | |
2234 | return rc; | |
2235 | } | |
2236 | ||
3f12070e EP |
2237 | int security_get_reject_unknown(void) |
2238 | { | |
2239 | return policydb.reject_unknown; | |
2240 | } | |
2241 | ||
2242 | int security_get_allow_unknown(void) | |
2243 | { | |
2244 | return policydb.allow_unknown; | |
2245 | } | |
2246 | ||
3bb56b25 PM |
2247 | /** |
2248 | * security_get_policycaps - Query the loaded policy for its capabilities | |
2249 | * @len: the number of capability bits | |
2250 | * @values: the capability bit array | |
2251 | * | |
2252 | * Description: | |
2253 | * Get an array of the policy capabilities in @values where each entry in | |
2254 | * @values is either true (1) or false (0) depending the policy's support of | |
2255 | * that feature. The policy capabilities are defined by the | |
2256 | * POLICYDB_CAPABILITY_* enums. The size of the array is stored in @len and it | |
2257 | * is up to the caller to free the array in @values. Returns zero on success, | |
2258 | * negative values on failure. | |
2259 | * | |
2260 | */ | |
2261 | int security_get_policycaps(int *len, int **values) | |
2262 | { | |
2263 | int rc = -ENOMEM; | |
2264 | unsigned int iter; | |
2265 | ||
2266 | POLICY_RDLOCK; | |
2267 | ||
2268 | *values = kcalloc(POLICYDB_CAPABILITY_MAX, sizeof(int), GFP_ATOMIC); | |
2269 | if (*values == NULL) | |
2270 | goto out; | |
2271 | for (iter = 0; iter < POLICYDB_CAPABILITY_MAX; iter++) | |
2272 | (*values)[iter] = ebitmap_get_bit(&policydb.policycaps, iter); | |
2273 | *len = POLICYDB_CAPABILITY_MAX; | |
2274 | ||
2275 | out: | |
2276 | POLICY_RDUNLOCK; | |
2277 | return rc; | |
2278 | } | |
2279 | ||
2280 | /** | |
2281 | * security_policycap_supported - Check for a specific policy capability | |
2282 | * @req_cap: capability | |
2283 | * | |
2284 | * Description: | |
2285 | * This function queries the currently loaded policy to see if it supports the | |
2286 | * capability specified by @req_cap. Returns true (1) if the capability is | |
2287 | * supported, false (0) if it isn't supported. | |
2288 | * | |
2289 | */ | |
2290 | int security_policycap_supported(unsigned int req_cap) | |
2291 | { | |
2292 | int rc; | |
2293 | ||
2294 | POLICY_RDLOCK; | |
2295 | rc = ebitmap_get_bit(&policydb.policycaps, req_cap); | |
2296 | POLICY_RDUNLOCK; | |
2297 | ||
2298 | return rc; | |
2299 | } | |
2300 | ||
376bd9cb DG |
2301 | struct selinux_audit_rule { |
2302 | u32 au_seqno; | |
2303 | struct context au_ctxt; | |
2304 | }; | |
2305 | ||
2306 | void selinux_audit_rule_free(struct selinux_audit_rule *rule) | |
2307 | { | |
2308 | if (rule) { | |
2309 | context_destroy(&rule->au_ctxt); | |
2310 | kfree(rule); | |
2311 | } | |
2312 | } | |
2313 | ||
2314 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, | |
2315 | struct selinux_audit_rule **rule) | |
2316 | { | |
2317 | struct selinux_audit_rule *tmprule; | |
2318 | struct role_datum *roledatum; | |
2319 | struct type_datum *typedatum; | |
2320 | struct user_datum *userdatum; | |
2321 | int rc = 0; | |
2322 | ||
2323 | *rule = NULL; | |
2324 | ||
2325 | if (!ss_initialized) | |
3ad40d64 | 2326 | return -EOPNOTSUPP; |
376bd9cb DG |
2327 | |
2328 | switch (field) { | |
3a6b9f85 DG |
2329 | case AUDIT_SUBJ_USER: |
2330 | case AUDIT_SUBJ_ROLE: | |
2331 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
2332 | case AUDIT_OBJ_USER: |
2333 | case AUDIT_OBJ_ROLE: | |
2334 | case AUDIT_OBJ_TYPE: | |
376bd9cb DG |
2335 | /* only 'equals' and 'not equals' fit user, role, and type */ |
2336 | if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL) | |
2337 | return -EINVAL; | |
2338 | break; | |
3a6b9f85 DG |
2339 | case AUDIT_SUBJ_SEN: |
2340 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2341 | case AUDIT_OBJ_LEV_LOW: |
2342 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2343 | /* we do not allow a range, indicated by the presense of '-' */ |
2344 | if (strchr(rulestr, '-')) | |
2345 | return -EINVAL; | |
2346 | break; | |
2347 | default: | |
2348 | /* only the above fields are valid */ | |
2349 | return -EINVAL; | |
2350 | } | |
2351 | ||
2352 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
2353 | if (!tmprule) | |
2354 | return -ENOMEM; | |
2355 | ||
2356 | context_init(&tmprule->au_ctxt); | |
2357 | ||
2358 | POLICY_RDLOCK; | |
2359 | ||
2360 | tmprule->au_seqno = latest_granting; | |
2361 | ||
2362 | switch (field) { | |
3a6b9f85 | 2363 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2364 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2365 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
2366 | if (!userdatum) | |
2367 | rc = -EINVAL; | |
2368 | else | |
2369 | tmprule->au_ctxt.user = userdatum->value; | |
2370 | break; | |
3a6b9f85 | 2371 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2372 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2373 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
2374 | if (!roledatum) | |
2375 | rc = -EINVAL; | |
2376 | else | |
2377 | tmprule->au_ctxt.role = roledatum->value; | |
2378 | break; | |
3a6b9f85 | 2379 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2380 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2381 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
2382 | if (!typedatum) | |
2383 | rc = -EINVAL; | |
2384 | else | |
2385 | tmprule->au_ctxt.type = typedatum->value; | |
2386 | break; | |
3a6b9f85 DG |
2387 | case AUDIT_SUBJ_SEN: |
2388 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2389 | case AUDIT_OBJ_LEV_LOW: |
2390 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2391 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
2392 | break; | |
2393 | } | |
2394 | ||
2395 | POLICY_RDUNLOCK; | |
2396 | ||
2397 | if (rc) { | |
2398 | selinux_audit_rule_free(tmprule); | |
2399 | tmprule = NULL; | |
2400 | } | |
2401 | ||
2402 | *rule = tmprule; | |
2403 | ||
2404 | return rc; | |
2405 | } | |
2406 | ||
9a2f44f0 | 2407 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, |
376bd9cb DG |
2408 | struct selinux_audit_rule *rule, |
2409 | struct audit_context *actx) | |
2410 | { | |
2411 | struct context *ctxt; | |
2412 | struct mls_level *level; | |
2413 | int match = 0; | |
2414 | ||
2415 | if (!rule) { | |
2416 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2417 | "selinux_audit_rule_match: missing rule\n"); | |
2418 | return -ENOENT; | |
2419 | } | |
2420 | ||
2421 | POLICY_RDLOCK; | |
2422 | ||
2423 | if (rule->au_seqno < latest_granting) { | |
2424 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2425 | "selinux_audit_rule_match: stale rule\n"); | |
2426 | match = -ESTALE; | |
2427 | goto out; | |
2428 | } | |
2429 | ||
9a2f44f0 | 2430 | ctxt = sidtab_search(&sidtab, sid); |
376bd9cb DG |
2431 | if (!ctxt) { |
2432 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2433 | "selinux_audit_rule_match: unrecognized SID %d\n", | |
9a2f44f0 | 2434 | sid); |
376bd9cb DG |
2435 | match = -ENOENT; |
2436 | goto out; | |
2437 | } | |
2438 | ||
2439 | /* a field/op pair that is not caught here will simply fall through | |
2440 | without a match */ | |
2441 | switch (field) { | |
3a6b9f85 | 2442 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2443 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2444 | switch (op) { |
2445 | case AUDIT_EQUAL: | |
2446 | match = (ctxt->user == rule->au_ctxt.user); | |
2447 | break; | |
2448 | case AUDIT_NOT_EQUAL: | |
2449 | match = (ctxt->user != rule->au_ctxt.user); | |
2450 | break; | |
2451 | } | |
2452 | break; | |
3a6b9f85 | 2453 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2454 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2455 | switch (op) { |
2456 | case AUDIT_EQUAL: | |
2457 | match = (ctxt->role == rule->au_ctxt.role); | |
2458 | break; | |
2459 | case AUDIT_NOT_EQUAL: | |
2460 | match = (ctxt->role != rule->au_ctxt.role); | |
2461 | break; | |
2462 | } | |
2463 | break; | |
3a6b9f85 | 2464 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2465 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2466 | switch (op) { |
2467 | case AUDIT_EQUAL: | |
2468 | match = (ctxt->type == rule->au_ctxt.type); | |
2469 | break; | |
2470 | case AUDIT_NOT_EQUAL: | |
2471 | match = (ctxt->type != rule->au_ctxt.type); | |
2472 | break; | |
2473 | } | |
2474 | break; | |
3a6b9f85 DG |
2475 | case AUDIT_SUBJ_SEN: |
2476 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2477 | case AUDIT_OBJ_LEV_LOW: |
2478 | case AUDIT_OBJ_LEV_HIGH: | |
2479 | level = ((field == AUDIT_SUBJ_SEN || | |
2480 | field == AUDIT_OBJ_LEV_LOW) ? | |
376bd9cb DG |
2481 | &ctxt->range.level[0] : &ctxt->range.level[1]); |
2482 | switch (op) { | |
2483 | case AUDIT_EQUAL: | |
2484 | match = mls_level_eq(&rule->au_ctxt.range.level[0], | |
2485 | level); | |
2486 | break; | |
2487 | case AUDIT_NOT_EQUAL: | |
2488 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2489 | level); | |
2490 | break; | |
2491 | case AUDIT_LESS_THAN: | |
2492 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], | |
2493 | level) && | |
2494 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2495 | level)); | |
2496 | break; | |
2497 | case AUDIT_LESS_THAN_OR_EQUAL: | |
2498 | match = mls_level_dom(&rule->au_ctxt.range.level[0], | |
2499 | level); | |
2500 | break; | |
2501 | case AUDIT_GREATER_THAN: | |
2502 | match = (mls_level_dom(level, | |
2503 | &rule->au_ctxt.range.level[0]) && | |
2504 | !mls_level_eq(level, | |
2505 | &rule->au_ctxt.range.level[0])); | |
2506 | break; | |
2507 | case AUDIT_GREATER_THAN_OR_EQUAL: | |
2508 | match = mls_level_dom(level, | |
2509 | &rule->au_ctxt.range.level[0]); | |
2510 | break; | |
2511 | } | |
2512 | } | |
2513 | ||
2514 | out: | |
2515 | POLICY_RDUNLOCK; | |
2516 | return match; | |
2517 | } | |
2518 | ||
2519 | static int (*aurule_callback)(void) = NULL; | |
2520 | ||
2521 | static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid, | |
2522 | u16 class, u32 perms, u32 *retained) | |
2523 | { | |
2524 | int err = 0; | |
2525 | ||
2526 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
2527 | err = aurule_callback(); | |
2528 | return err; | |
2529 | } | |
2530 | ||
2531 | static int __init aurule_init(void) | |
2532 | { | |
2533 | int err; | |
2534 | ||
2535 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET, | |
2536 | SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0); | |
2537 | if (err) | |
2538 | panic("avc_add_callback() failed, error %d\n", err); | |
2539 | ||
2540 | return err; | |
2541 | } | |
2542 | __initcall(aurule_init); | |
2543 | ||
2544 | void selinux_audit_set_callback(int (*callback)(void)) | |
2545 | { | |
2546 | aurule_callback = callback; | |
2547 | } | |
7420ed23 VY |
2548 | |
2549 | #ifdef CONFIG_NETLABEL | |
2550 | /* | |
5778eabd | 2551 | * NetLabel cache structure |
7420ed23 | 2552 | */ |
5778eabd | 2553 | #define NETLBL_CACHE(x) ((struct selinux_netlbl_cache *)(x)) |
7420ed23 VY |
2554 | #define NETLBL_CACHE_T_NONE 0 |
2555 | #define NETLBL_CACHE_T_SID 1 | |
2556 | #define NETLBL_CACHE_T_MLS 2 | |
5778eabd | 2557 | struct selinux_netlbl_cache { |
7420ed23 VY |
2558 | u32 type; |
2559 | union { | |
2560 | u32 sid; | |
2561 | struct mls_range mls_label; | |
2562 | } data; | |
2563 | }; | |
2564 | ||
2565 | /** | |
5778eabd | 2566 | * security_netlbl_cache_free - Free the NetLabel cached data |
7420ed23 VY |
2567 | * @data: the data to free |
2568 | * | |
2569 | * Description: | |
2570 | * This function is intended to be used as the free() callback inside the | |
2571 | * netlbl_lsm_cache structure. | |
2572 | * | |
2573 | */ | |
5778eabd | 2574 | static void security_netlbl_cache_free(const void *data) |
7420ed23 | 2575 | { |
5778eabd | 2576 | struct selinux_netlbl_cache *cache; |
ffb733c6 | 2577 | |
2578 | if (data == NULL) | |
2579 | return; | |
2580 | ||
2581 | cache = NETLBL_CACHE(data); | |
7420ed23 VY |
2582 | switch (cache->type) { |
2583 | case NETLBL_CACHE_T_MLS: | |
2584 | ebitmap_destroy(&cache->data.mls_label.level[0].cat); | |
2585 | break; | |
2586 | } | |
2587 | kfree(data); | |
2588 | } | |
2589 | ||
2590 | /** | |
5778eabd PM |
2591 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
2592 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
2593 | * @ctx: the SELinux context |
2594 | * | |
2595 | * Description: | |
2596 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
2597 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
2598 | * already been initialized. | |
7420ed23 VY |
2599 | * |
2600 | */ | |
5778eabd PM |
2601 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
2602 | struct context *ctx) | |
7420ed23 | 2603 | { |
5778eabd | 2604 | struct selinux_netlbl_cache *cache = NULL; |
7420ed23 | 2605 | |
5778eabd PM |
2606 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
2607 | if (secattr->cache == NULL) | |
2608 | return; | |
7420ed23 VY |
2609 | |
2610 | cache = kzalloc(sizeof(*cache), GFP_ATOMIC); | |
2611 | if (cache == NULL) | |
5778eabd | 2612 | return; |
7420ed23 VY |
2613 | |
2614 | cache->type = NETLBL_CACHE_T_MLS; | |
2615 | if (ebitmap_cpy(&cache->data.mls_label.level[0].cat, | |
0ec8abd7 JJ |
2616 | &ctx->range.level[0].cat) != 0) { |
2617 | kfree(cache); | |
5778eabd | 2618 | return; |
0ec8abd7 | 2619 | } |
7420ed23 VY |
2620 | cache->data.mls_label.level[1].cat.highbit = |
2621 | cache->data.mls_label.level[0].cat.highbit; | |
2622 | cache->data.mls_label.level[1].cat.node = | |
2623 | cache->data.mls_label.level[0].cat.node; | |
2624 | cache->data.mls_label.level[0].sens = ctx->range.level[0].sens; | |
2625 | cache->data.mls_label.level[1].sens = ctx->range.level[0].sens; | |
2626 | ||
5778eabd PM |
2627 | secattr->cache->free = security_netlbl_cache_free; |
2628 | secattr->cache->data = (void *)cache; | |
2629 | secattr->flags |= NETLBL_SECATTR_CACHE; | |
7420ed23 VY |
2630 | } |
2631 | ||
2632 | /** | |
5778eabd | 2633 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 VY |
2634 | * @secattr: the NetLabel packet security attributes |
2635 | * @base_sid: the SELinux SID to use as a context for MLS only attributes | |
2636 | * @sid: the SELinux SID | |
2637 | * | |
2638 | * Description: | |
5778eabd | 2639 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 2640 | * SELinux SID. If the @secattr field does not contain a full SELinux |
5778eabd PM |
2641 | * SID/context then use the context in @base_sid as the foundation. If |
2642 | * possibile the 'cache' field of @secattr is set and the CACHE flag is set; | |
2643 | * this is to allow the @secattr to be used by NetLabel to cache the secattr to | |
2644 | * SID conversion for future lookups. Returns zero on success, negative | |
2645 | * values on failure. | |
7420ed23 VY |
2646 | * |
2647 | */ | |
5778eabd PM |
2648 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
2649 | u32 base_sid, | |
2650 | u32 *sid) | |
7420ed23 VY |
2651 | { |
2652 | int rc = -EIDRM; | |
2653 | struct context *ctx; | |
2654 | struct context ctx_new; | |
5778eabd PM |
2655 | struct selinux_netlbl_cache *cache; |
2656 | ||
2657 | if (!ss_initialized) { | |
2658 | *sid = SECSID_NULL; | |
2659 | return 0; | |
2660 | } | |
7420ed23 VY |
2661 | |
2662 | POLICY_RDLOCK; | |
2663 | ||
701a90ba | 2664 | if (secattr->flags & NETLBL_SECATTR_CACHE) { |
ffb733c6 | 2665 | cache = NETLBL_CACHE(secattr->cache->data); |
7420ed23 VY |
2666 | switch (cache->type) { |
2667 | case NETLBL_CACHE_T_SID: | |
2668 | *sid = cache->data.sid; | |
2669 | rc = 0; | |
2670 | break; | |
2671 | case NETLBL_CACHE_T_MLS: | |
2672 | ctx = sidtab_search(&sidtab, base_sid); | |
2673 | if (ctx == NULL) | |
2674 | goto netlbl_secattr_to_sid_return; | |
2675 | ||
2676 | ctx_new.user = ctx->user; | |
2677 | ctx_new.role = ctx->role; | |
2678 | ctx_new.type = ctx->type; | |
2679 | ctx_new.range.level[0].sens = | |
2680 | cache->data.mls_label.level[0].sens; | |
2681 | ctx_new.range.level[0].cat.highbit = | |
2682 | cache->data.mls_label.level[0].cat.highbit; | |
2683 | ctx_new.range.level[0].cat.node = | |
2684 | cache->data.mls_label.level[0].cat.node; | |
2685 | ctx_new.range.level[1].sens = | |
2686 | cache->data.mls_label.level[1].sens; | |
2687 | ctx_new.range.level[1].cat.highbit = | |
2688 | cache->data.mls_label.level[1].cat.highbit; | |
2689 | ctx_new.range.level[1].cat.node = | |
2690 | cache->data.mls_label.level[1].cat.node; | |
2691 | ||
2692 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
2693 | break; | |
2694 | default: | |
2695 | goto netlbl_secattr_to_sid_return; | |
2696 | } | |
16efd454 PM |
2697 | } else if (secattr->flags & NETLBL_SECATTR_SECID) { |
2698 | *sid = secattr->attr.secid; | |
2699 | rc = 0; | |
701a90ba | 2700 | } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
7420ed23 VY |
2701 | ctx = sidtab_search(&sidtab, base_sid); |
2702 | if (ctx == NULL) | |
2703 | goto netlbl_secattr_to_sid_return; | |
2704 | ||
2705 | ctx_new.user = ctx->user; | |
2706 | ctx_new.role = ctx->role; | |
2707 | ctx_new.type = ctx->type; | |
02752760 | 2708 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 2709 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
02752760 | 2710 | if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat, |
16efd454 | 2711 | secattr->attr.mls.cat) != 0) |
7420ed23 VY |
2712 | goto netlbl_secattr_to_sid_return; |
2713 | ctx_new.range.level[1].cat.highbit = | |
2714 | ctx_new.range.level[0].cat.highbit; | |
2715 | ctx_new.range.level[1].cat.node = | |
2716 | ctx_new.range.level[0].cat.node; | |
2717 | } else { | |
2718 | ebitmap_init(&ctx_new.range.level[0].cat); | |
2719 | ebitmap_init(&ctx_new.range.level[1].cat); | |
2720 | } | |
2721 | if (mls_context_isvalid(&policydb, &ctx_new) != 1) | |
2722 | goto netlbl_secattr_to_sid_return_cleanup; | |
2723 | ||
2724 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
2725 | if (rc != 0) | |
2726 | goto netlbl_secattr_to_sid_return_cleanup; | |
2727 | ||
5778eabd PM |
2728 | security_netlbl_cache_add(secattr, &ctx_new); |
2729 | ||
7420ed23 VY |
2730 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
2731 | } else { | |
388b2405 | 2732 | *sid = SECSID_NULL; |
7420ed23 VY |
2733 | rc = 0; |
2734 | } | |
2735 | ||
2736 | netlbl_secattr_to_sid_return: | |
2737 | POLICY_RDUNLOCK; | |
2738 | return rc; | |
2739 | netlbl_secattr_to_sid_return_cleanup: | |
2740 | ebitmap_destroy(&ctx_new.range.level[0].cat); | |
2741 | goto netlbl_secattr_to_sid_return; | |
2742 | } | |
2743 | ||
2744 | /** | |
5778eabd PM |
2745 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
2746 | * @sid: the SELinux SID | |
2747 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
2748 | * |
2749 | * Description: | |
5778eabd PM |
2750 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
2751 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
2752 | * |
2753 | */ | |
5778eabd | 2754 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 VY |
2755 | { |
2756 | int rc = -ENOENT; | |
7420ed23 VY |
2757 | struct context *ctx; |
2758 | ||
2759 | if (!ss_initialized) | |
2760 | return 0; | |
2761 | ||
2762 | POLICY_RDLOCK; | |
7420ed23 VY |
2763 | ctx = sidtab_search(&sidtab, sid); |
2764 | if (ctx == NULL) | |
5778eabd PM |
2765 | goto netlbl_sid_to_secattr_failure; |
2766 | secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], | |
2767 | GFP_ATOMIC); | |
2768 | secattr->flags |= NETLBL_SECATTR_DOMAIN; | |
2769 | mls_export_netlbl_lvl(ctx, secattr); | |
2770 | rc = mls_export_netlbl_cat(ctx, secattr); | |
bf0edf39 | 2771 | if (rc != 0) |
5778eabd | 2772 | goto netlbl_sid_to_secattr_failure; |
7420ed23 | 2773 | POLICY_RDUNLOCK; |
99f59ed0 | 2774 | |
5778eabd | 2775 | return 0; |
f8687afe | 2776 | |
5778eabd PM |
2777 | netlbl_sid_to_secattr_failure: |
2778 | POLICY_RDUNLOCK; | |
2779 | netlbl_secattr_destroy(secattr); | |
f8687afe PM |
2780 | return rc; |
2781 | } | |
7420ed23 | 2782 | #endif /* CONFIG_NETLABEL */ |