Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Implementation of the security services. | |
3 | * | |
4 | * Authors : Stephen Smalley, <sds@epoch.ncsc.mil> | |
5 | * James Morris <jmorris@redhat.com> | |
6 | * | |
7 | * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> | |
8 | * | |
9 | * Support for enhanced MLS infrastructure. | |
376bd9cb | 10 | * Support for context based audit filters. |
1da177e4 LT |
11 | * |
12 | * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> | |
13 | * | |
14 | * Added conditional policy language extensions | |
15 | * | |
7420ed23 VY |
16 | * Updated: Hewlett-Packard <paul.moore@hp.com> |
17 | * | |
18 | * Added support for NetLabel | |
19 | * | |
b94c7e67 CS |
20 | * Updated: Chad Sellers <csellers@tresys.com> |
21 | * | |
22 | * Added validation of kernel classes and permissions | |
23 | * | |
7420ed23 | 24 | * Copyright (C) 2006 Hewlett-Packard Development Company, L.P. |
376bd9cb | 25 | * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. |
b94c7e67 | 26 | * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC |
1da177e4 LT |
27 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> |
28 | * This program is free software; you can redistribute it and/or modify | |
29 | * it under the terms of the GNU General Public License as published by | |
30 | * the Free Software Foundation, version 2. | |
31 | */ | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/string.h> | |
35 | #include <linux/spinlock.h> | |
9f2ad665 | 36 | #include <linux/rcupdate.h> |
1da177e4 LT |
37 | #include <linux/errno.h> |
38 | #include <linux/in.h> | |
39 | #include <linux/sched.h> | |
40 | #include <linux/audit.h> | |
bb003079 | 41 | #include <linux/mutex.h> |
7420ed23 | 42 | #include <net/netlabel.h> |
bb003079 | 43 | |
1da177e4 LT |
44 | #include "flask.h" |
45 | #include "avc.h" | |
46 | #include "avc_ss.h" | |
47 | #include "security.h" | |
48 | #include "context.h" | |
49 | #include "policydb.h" | |
50 | #include "sidtab.h" | |
51 | #include "services.h" | |
52 | #include "conditional.h" | |
53 | #include "mls.h" | |
7420ed23 | 54 | #include "objsec.h" |
c60475bf | 55 | #include "netlabel.h" |
3de4bab5 | 56 | #include "xfrm.h" |
02752760 | 57 | #include "ebitmap.h" |
1da177e4 LT |
58 | |
59 | extern void selnl_notify_policyload(u32 seqno); | |
60 | unsigned int policydb_loaded_version; | |
61 | ||
b94c7e67 CS |
62 | /* |
63 | * This is declared in avc.c | |
64 | */ | |
65 | extern const struct selinux_class_perm selinux_class_perm; | |
66 | ||
1da177e4 LT |
67 | static DEFINE_RWLOCK(policy_rwlock); |
68 | #define POLICY_RDLOCK read_lock(&policy_rwlock) | |
69 | #define POLICY_WRLOCK write_lock_irq(&policy_rwlock) | |
70 | #define POLICY_RDUNLOCK read_unlock(&policy_rwlock) | |
71 | #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock) | |
72 | ||
bb003079 IM |
73 | static DEFINE_MUTEX(load_mutex); |
74 | #define LOAD_LOCK mutex_lock(&load_mutex) | |
75 | #define LOAD_UNLOCK mutex_unlock(&load_mutex) | |
1da177e4 LT |
76 | |
77 | static struct sidtab sidtab; | |
78 | struct policydb policydb; | |
79 | int ss_initialized = 0; | |
80 | ||
81 | /* | |
82 | * The largest sequence number that has been used when | |
83 | * providing an access decision to the access vector cache. | |
84 | * The sequence number only changes when a policy change | |
85 | * occurs. | |
86 | */ | |
87 | static u32 latest_granting = 0; | |
88 | ||
89 | /* Forward declaration. */ | |
90 | static int context_struct_to_string(struct context *context, char **scontext, | |
91 | u32 *scontext_len); | |
92 | ||
93 | /* | |
94 | * Return the boolean value of a constraint expression | |
95 | * when it is applied to the specified source and target | |
96 | * security contexts. | |
97 | * | |
98 | * xcontext is a special beast... It is used by the validatetrans rules | |
99 | * only. For these rules, scontext is the context before the transition, | |
100 | * tcontext is the context after the transition, and xcontext is the context | |
101 | * of the process performing the transition. All other callers of | |
102 | * constraint_expr_eval should pass in NULL for xcontext. | |
103 | */ | |
104 | static int constraint_expr_eval(struct context *scontext, | |
105 | struct context *tcontext, | |
106 | struct context *xcontext, | |
107 | struct constraint_expr *cexpr) | |
108 | { | |
109 | u32 val1, val2; | |
110 | struct context *c; | |
111 | struct role_datum *r1, *r2; | |
112 | struct mls_level *l1, *l2; | |
113 | struct constraint_expr *e; | |
114 | int s[CEXPR_MAXDEPTH]; | |
115 | int sp = -1; | |
116 | ||
117 | for (e = cexpr; e; e = e->next) { | |
118 | switch (e->expr_type) { | |
119 | case CEXPR_NOT: | |
120 | BUG_ON(sp < 0); | |
121 | s[sp] = !s[sp]; | |
122 | break; | |
123 | case CEXPR_AND: | |
124 | BUG_ON(sp < 1); | |
125 | sp--; | |
126 | s[sp] &= s[sp+1]; | |
127 | break; | |
128 | case CEXPR_OR: | |
129 | BUG_ON(sp < 1); | |
130 | sp--; | |
131 | s[sp] |= s[sp+1]; | |
132 | break; | |
133 | case CEXPR_ATTR: | |
134 | if (sp == (CEXPR_MAXDEPTH-1)) | |
135 | return 0; | |
136 | switch (e->attr) { | |
137 | case CEXPR_USER: | |
138 | val1 = scontext->user; | |
139 | val2 = tcontext->user; | |
140 | break; | |
141 | case CEXPR_TYPE: | |
142 | val1 = scontext->type; | |
143 | val2 = tcontext->type; | |
144 | break; | |
145 | case CEXPR_ROLE: | |
146 | val1 = scontext->role; | |
147 | val2 = tcontext->role; | |
148 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
149 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
150 | switch (e->op) { | |
151 | case CEXPR_DOM: | |
152 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
153 | val2 - 1); | |
154 | continue; | |
155 | case CEXPR_DOMBY: | |
156 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
157 | val1 - 1); | |
158 | continue; | |
159 | case CEXPR_INCOMP: | |
160 | s[++sp] = ( !ebitmap_get_bit(&r1->dominates, | |
161 | val2 - 1) && | |
162 | !ebitmap_get_bit(&r2->dominates, | |
163 | val1 - 1) ); | |
164 | continue; | |
165 | default: | |
166 | break; | |
167 | } | |
168 | break; | |
169 | case CEXPR_L1L2: | |
170 | l1 = &(scontext->range.level[0]); | |
171 | l2 = &(tcontext->range.level[0]); | |
172 | goto mls_ops; | |
173 | case CEXPR_L1H2: | |
174 | l1 = &(scontext->range.level[0]); | |
175 | l2 = &(tcontext->range.level[1]); | |
176 | goto mls_ops; | |
177 | case CEXPR_H1L2: | |
178 | l1 = &(scontext->range.level[1]); | |
179 | l2 = &(tcontext->range.level[0]); | |
180 | goto mls_ops; | |
181 | case CEXPR_H1H2: | |
182 | l1 = &(scontext->range.level[1]); | |
183 | l2 = &(tcontext->range.level[1]); | |
184 | goto mls_ops; | |
185 | case CEXPR_L1H1: | |
186 | l1 = &(scontext->range.level[0]); | |
187 | l2 = &(scontext->range.level[1]); | |
188 | goto mls_ops; | |
189 | case CEXPR_L2H2: | |
190 | l1 = &(tcontext->range.level[0]); | |
191 | l2 = &(tcontext->range.level[1]); | |
192 | goto mls_ops; | |
193 | mls_ops: | |
194 | switch (e->op) { | |
195 | case CEXPR_EQ: | |
196 | s[++sp] = mls_level_eq(l1, l2); | |
197 | continue; | |
198 | case CEXPR_NEQ: | |
199 | s[++sp] = !mls_level_eq(l1, l2); | |
200 | continue; | |
201 | case CEXPR_DOM: | |
202 | s[++sp] = mls_level_dom(l1, l2); | |
203 | continue; | |
204 | case CEXPR_DOMBY: | |
205 | s[++sp] = mls_level_dom(l2, l1); | |
206 | continue; | |
207 | case CEXPR_INCOMP: | |
208 | s[++sp] = mls_level_incomp(l2, l1); | |
209 | continue; | |
210 | default: | |
211 | BUG(); | |
212 | return 0; | |
213 | } | |
214 | break; | |
215 | default: | |
216 | BUG(); | |
217 | return 0; | |
218 | } | |
219 | ||
220 | switch (e->op) { | |
221 | case CEXPR_EQ: | |
222 | s[++sp] = (val1 == val2); | |
223 | break; | |
224 | case CEXPR_NEQ: | |
225 | s[++sp] = (val1 != val2); | |
226 | break; | |
227 | default: | |
228 | BUG(); | |
229 | return 0; | |
230 | } | |
231 | break; | |
232 | case CEXPR_NAMES: | |
233 | if (sp == (CEXPR_MAXDEPTH-1)) | |
234 | return 0; | |
235 | c = scontext; | |
236 | if (e->attr & CEXPR_TARGET) | |
237 | c = tcontext; | |
238 | else if (e->attr & CEXPR_XTARGET) { | |
239 | c = xcontext; | |
240 | if (!c) { | |
241 | BUG(); | |
242 | return 0; | |
243 | } | |
244 | } | |
245 | if (e->attr & CEXPR_USER) | |
246 | val1 = c->user; | |
247 | else if (e->attr & CEXPR_ROLE) | |
248 | val1 = c->role; | |
249 | else if (e->attr & CEXPR_TYPE) | |
250 | val1 = c->type; | |
251 | else { | |
252 | BUG(); | |
253 | return 0; | |
254 | } | |
255 | ||
256 | switch (e->op) { | |
257 | case CEXPR_EQ: | |
258 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
259 | break; | |
260 | case CEXPR_NEQ: | |
261 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
262 | break; | |
263 | default: | |
264 | BUG(); | |
265 | return 0; | |
266 | } | |
267 | break; | |
268 | default: | |
269 | BUG(); | |
270 | return 0; | |
271 | } | |
272 | } | |
273 | ||
274 | BUG_ON(sp != 0); | |
275 | return s[0]; | |
276 | } | |
277 | ||
278 | /* | |
279 | * Compute access vectors based on a context structure pair for | |
280 | * the permissions in a particular class. | |
281 | */ | |
282 | static int context_struct_compute_av(struct context *scontext, | |
283 | struct context *tcontext, | |
284 | u16 tclass, | |
285 | u32 requested, | |
286 | struct av_decision *avd) | |
287 | { | |
288 | struct constraint_node *constraint; | |
289 | struct role_allow *ra; | |
290 | struct avtab_key avkey; | |
782ebb99 | 291 | struct avtab_node *node; |
1da177e4 | 292 | struct class_datum *tclass_datum; |
782ebb99 SS |
293 | struct ebitmap *sattr, *tattr; |
294 | struct ebitmap_node *snode, *tnode; | |
295 | unsigned int i, j; | |
1da177e4 LT |
296 | |
297 | /* | |
298 | * Remap extended Netlink classes for old policy versions. | |
299 | * Do this here rather than socket_type_to_security_class() | |
300 | * in case a newer policy version is loaded, allowing sockets | |
301 | * to remain in the correct class. | |
302 | */ | |
303 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
304 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
305 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
306 | tclass = SECCLASS_NETLINK_SOCKET; | |
307 | ||
308 | if (!tclass || tclass > policydb.p_classes.nprim) { | |
309 | printk(KERN_ERR "security_compute_av: unrecognized class %d\n", | |
310 | tclass); | |
311 | return -EINVAL; | |
312 | } | |
313 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
314 | ||
315 | /* | |
316 | * Initialize the access vectors to the default values. | |
317 | */ | |
318 | avd->allowed = 0; | |
319 | avd->decided = 0xffffffff; | |
320 | avd->auditallow = 0; | |
321 | avd->auditdeny = 0xffffffff; | |
322 | avd->seqno = latest_granting; | |
323 | ||
324 | /* | |
325 | * If a specific type enforcement rule was defined for | |
326 | * this permission check, then use it. | |
327 | */ | |
1da177e4 | 328 | avkey.target_class = tclass; |
782ebb99 SS |
329 | avkey.specified = AVTAB_AV; |
330 | sattr = &policydb.type_attr_map[scontext->type - 1]; | |
331 | tattr = &policydb.type_attr_map[tcontext->type - 1]; | |
332 | ebitmap_for_each_bit(sattr, snode, i) { | |
333 | if (!ebitmap_node_get_bit(snode, i)) | |
334 | continue; | |
335 | ebitmap_for_each_bit(tattr, tnode, j) { | |
336 | if (!ebitmap_node_get_bit(tnode, j)) | |
337 | continue; | |
338 | avkey.source_type = i + 1; | |
339 | avkey.target_type = j + 1; | |
340 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
341 | node != NULL; | |
342 | node = avtab_search_node_next(node, avkey.specified)) { | |
343 | if (node->key.specified == AVTAB_ALLOWED) | |
344 | avd->allowed |= node->datum.data; | |
345 | else if (node->key.specified == AVTAB_AUDITALLOW) | |
346 | avd->auditallow |= node->datum.data; | |
347 | else if (node->key.specified == AVTAB_AUDITDENY) | |
348 | avd->auditdeny &= node->datum.data; | |
349 | } | |
1da177e4 | 350 | |
782ebb99 SS |
351 | /* Check conditional av table for additional permissions */ |
352 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); | |
353 | ||
354 | } | |
355 | } | |
1da177e4 LT |
356 | |
357 | /* | |
358 | * Remove any permissions prohibited by a constraint (this includes | |
359 | * the MLS policy). | |
360 | */ | |
361 | constraint = tclass_datum->constraints; | |
362 | while (constraint) { | |
363 | if ((constraint->permissions & (avd->allowed)) && | |
364 | !constraint_expr_eval(scontext, tcontext, NULL, | |
365 | constraint->expr)) { | |
366 | avd->allowed = (avd->allowed) & ~(constraint->permissions); | |
367 | } | |
368 | constraint = constraint->next; | |
369 | } | |
370 | ||
371 | /* | |
372 | * If checking process transition permission and the | |
373 | * role is changing, then check the (current_role, new_role) | |
374 | * pair. | |
375 | */ | |
376 | if (tclass == SECCLASS_PROCESS && | |
377 | (avd->allowed & (PROCESS__TRANSITION | PROCESS__DYNTRANSITION)) && | |
378 | scontext->role != tcontext->role) { | |
379 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
380 | if (scontext->role == ra->role && | |
381 | tcontext->role == ra->new_role) | |
382 | break; | |
383 | } | |
384 | if (!ra) | |
385 | avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION | | |
386 | PROCESS__DYNTRANSITION); | |
387 | } | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | static int security_validtrans_handle_fail(struct context *ocontext, | |
393 | struct context *ncontext, | |
394 | struct context *tcontext, | |
395 | u16 tclass) | |
396 | { | |
397 | char *o = NULL, *n = NULL, *t = NULL; | |
398 | u32 olen, nlen, tlen; | |
399 | ||
400 | if (context_struct_to_string(ocontext, &o, &olen) < 0) | |
401 | goto out; | |
402 | if (context_struct_to_string(ncontext, &n, &nlen) < 0) | |
403 | goto out; | |
404 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
405 | goto out; | |
9ad9ad38 | 406 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
407 | "security_validate_transition: denied for" |
408 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", | |
409 | o, n, t, policydb.p_class_val_to_name[tclass-1]); | |
410 | out: | |
411 | kfree(o); | |
412 | kfree(n); | |
413 | kfree(t); | |
414 | ||
415 | if (!selinux_enforcing) | |
416 | return 0; | |
417 | return -EPERM; | |
418 | } | |
419 | ||
420 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
421 | u16 tclass) | |
422 | { | |
423 | struct context *ocontext; | |
424 | struct context *ncontext; | |
425 | struct context *tcontext; | |
426 | struct class_datum *tclass_datum; | |
427 | struct constraint_node *constraint; | |
428 | int rc = 0; | |
429 | ||
430 | if (!ss_initialized) | |
431 | return 0; | |
432 | ||
433 | POLICY_RDLOCK; | |
434 | ||
435 | /* | |
436 | * Remap extended Netlink classes for old policy versions. | |
437 | * Do this here rather than socket_type_to_security_class() | |
438 | * in case a newer policy version is loaded, allowing sockets | |
439 | * to remain in the correct class. | |
440 | */ | |
441 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
442 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
443 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
444 | tclass = SECCLASS_NETLINK_SOCKET; | |
445 | ||
446 | if (!tclass || tclass > policydb.p_classes.nprim) { | |
447 | printk(KERN_ERR "security_validate_transition: " | |
448 | "unrecognized class %d\n", tclass); | |
449 | rc = -EINVAL; | |
450 | goto out; | |
451 | } | |
452 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
453 | ||
454 | ocontext = sidtab_search(&sidtab, oldsid); | |
455 | if (!ocontext) { | |
456 | printk(KERN_ERR "security_validate_transition: " | |
457 | " unrecognized SID %d\n", oldsid); | |
458 | rc = -EINVAL; | |
459 | goto out; | |
460 | } | |
461 | ||
462 | ncontext = sidtab_search(&sidtab, newsid); | |
463 | if (!ncontext) { | |
464 | printk(KERN_ERR "security_validate_transition: " | |
465 | " unrecognized SID %d\n", newsid); | |
466 | rc = -EINVAL; | |
467 | goto out; | |
468 | } | |
469 | ||
470 | tcontext = sidtab_search(&sidtab, tasksid); | |
471 | if (!tcontext) { | |
472 | printk(KERN_ERR "security_validate_transition: " | |
473 | " unrecognized SID %d\n", tasksid); | |
474 | rc = -EINVAL; | |
475 | goto out; | |
476 | } | |
477 | ||
478 | constraint = tclass_datum->validatetrans; | |
479 | while (constraint) { | |
480 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
481 | constraint->expr)) { | |
482 | rc = security_validtrans_handle_fail(ocontext, ncontext, | |
483 | tcontext, tclass); | |
484 | goto out; | |
485 | } | |
486 | constraint = constraint->next; | |
487 | } | |
488 | ||
489 | out: | |
490 | POLICY_RDUNLOCK; | |
491 | return rc; | |
492 | } | |
493 | ||
494 | /** | |
495 | * security_compute_av - Compute access vector decisions. | |
496 | * @ssid: source security identifier | |
497 | * @tsid: target security identifier | |
498 | * @tclass: target security class | |
499 | * @requested: requested permissions | |
500 | * @avd: access vector decisions | |
501 | * | |
502 | * Compute a set of access vector decisions based on the | |
503 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
504 | * Return -%EINVAL if any of the parameters are invalid or %0 | |
505 | * if the access vector decisions were computed successfully. | |
506 | */ | |
507 | int security_compute_av(u32 ssid, | |
508 | u32 tsid, | |
509 | u16 tclass, | |
510 | u32 requested, | |
511 | struct av_decision *avd) | |
512 | { | |
513 | struct context *scontext = NULL, *tcontext = NULL; | |
514 | int rc = 0; | |
515 | ||
516 | if (!ss_initialized) { | |
4c443d1b SS |
517 | avd->allowed = 0xffffffff; |
518 | avd->decided = 0xffffffff; | |
1da177e4 LT |
519 | avd->auditallow = 0; |
520 | avd->auditdeny = 0xffffffff; | |
521 | avd->seqno = latest_granting; | |
522 | return 0; | |
523 | } | |
524 | ||
525 | POLICY_RDLOCK; | |
526 | ||
527 | scontext = sidtab_search(&sidtab, ssid); | |
528 | if (!scontext) { | |
529 | printk(KERN_ERR "security_compute_av: unrecognized SID %d\n", | |
530 | ssid); | |
531 | rc = -EINVAL; | |
532 | goto out; | |
533 | } | |
534 | tcontext = sidtab_search(&sidtab, tsid); | |
535 | if (!tcontext) { | |
536 | printk(KERN_ERR "security_compute_av: unrecognized SID %d\n", | |
537 | tsid); | |
538 | rc = -EINVAL; | |
539 | goto out; | |
540 | } | |
541 | ||
542 | rc = context_struct_compute_av(scontext, tcontext, tclass, | |
543 | requested, avd); | |
544 | out: | |
545 | POLICY_RDUNLOCK; | |
546 | return rc; | |
547 | } | |
548 | ||
549 | /* | |
550 | * Write the security context string representation of | |
551 | * the context structure `context' into a dynamically | |
552 | * allocated string of the correct size. Set `*scontext' | |
553 | * to point to this string and set `*scontext_len' to | |
554 | * the length of the string. | |
555 | */ | |
556 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
557 | { | |
558 | char *scontextp; | |
559 | ||
560 | *scontext = NULL; | |
561 | *scontext_len = 0; | |
562 | ||
563 | /* Compute the size of the context. */ | |
564 | *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; | |
565 | *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; | |
566 | *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; | |
567 | *scontext_len += mls_compute_context_len(context); | |
568 | ||
569 | /* Allocate space for the context; caller must free this space. */ | |
570 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
571 | if (!scontextp) { | |
572 | return -ENOMEM; | |
573 | } | |
574 | *scontext = scontextp; | |
575 | ||
576 | /* | |
577 | * Copy the user name, role name and type name into the context. | |
578 | */ | |
579 | sprintf(scontextp, "%s:%s:%s", | |
580 | policydb.p_user_val_to_name[context->user - 1], | |
581 | policydb.p_role_val_to_name[context->role - 1], | |
582 | policydb.p_type_val_to_name[context->type - 1]); | |
583 | scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + | |
584 | 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + | |
585 | 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); | |
586 | ||
587 | mls_sid_to_context(context, &scontextp); | |
588 | ||
589 | *scontextp = 0; | |
590 | ||
591 | return 0; | |
592 | } | |
593 | ||
594 | #include "initial_sid_to_string.h" | |
595 | ||
f0ee2e46 JC |
596 | const char *security_get_initial_sid_context(u32 sid) |
597 | { | |
598 | if (unlikely(sid > SECINITSID_NUM)) | |
599 | return NULL; | |
600 | return initial_sid_to_string[sid]; | |
601 | } | |
602 | ||
1da177e4 LT |
603 | /** |
604 | * security_sid_to_context - Obtain a context for a given SID. | |
605 | * @sid: security identifier, SID | |
606 | * @scontext: security context | |
607 | * @scontext_len: length in bytes | |
608 | * | |
609 | * Write the string representation of the context associated with @sid | |
610 | * into a dynamically allocated string of the correct size. Set @scontext | |
611 | * to point to this string and set @scontext_len to the length of the string. | |
612 | */ | |
613 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
614 | { | |
615 | struct context *context; | |
616 | int rc = 0; | |
617 | ||
4f4acf3a SS |
618 | *scontext = NULL; |
619 | *scontext_len = 0; | |
620 | ||
1da177e4 LT |
621 | if (!ss_initialized) { |
622 | if (sid <= SECINITSID_NUM) { | |
623 | char *scontextp; | |
624 | ||
625 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
626 | scontextp = kmalloc(*scontext_len,GFP_ATOMIC); | |
0cccca06 SH |
627 | if (!scontextp) { |
628 | rc = -ENOMEM; | |
629 | goto out; | |
630 | } | |
1da177e4 LT |
631 | strcpy(scontextp, initial_sid_to_string[sid]); |
632 | *scontext = scontextp; | |
633 | goto out; | |
634 | } | |
635 | printk(KERN_ERR "security_sid_to_context: called before initial " | |
636 | "load_policy on unknown SID %d\n", sid); | |
637 | rc = -EINVAL; | |
638 | goto out; | |
639 | } | |
640 | POLICY_RDLOCK; | |
641 | context = sidtab_search(&sidtab, sid); | |
642 | if (!context) { | |
643 | printk(KERN_ERR "security_sid_to_context: unrecognized SID " | |
644 | "%d\n", sid); | |
645 | rc = -EINVAL; | |
646 | goto out_unlock; | |
647 | } | |
648 | rc = context_struct_to_string(context, scontext, scontext_len); | |
649 | out_unlock: | |
650 | POLICY_RDUNLOCK; | |
651 | out: | |
652 | return rc; | |
653 | ||
654 | } | |
655 | ||
f5c1d5b2 | 656 | static int security_context_to_sid_core(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid) |
1da177e4 LT |
657 | { |
658 | char *scontext2; | |
659 | struct context context; | |
660 | struct role_datum *role; | |
661 | struct type_datum *typdatum; | |
662 | struct user_datum *usrdatum; | |
663 | char *scontextp, *p, oldc; | |
664 | int rc = 0; | |
665 | ||
666 | if (!ss_initialized) { | |
667 | int i; | |
668 | ||
669 | for (i = 1; i < SECINITSID_NUM; i++) { | |
670 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
671 | *sid = i; | |
672 | goto out; | |
673 | } | |
674 | } | |
675 | *sid = SECINITSID_KERNEL; | |
676 | goto out; | |
677 | } | |
678 | *sid = SECSID_NULL; | |
679 | ||
680 | /* Copy the string so that we can modify the copy as we parse it. | |
681 | The string should already by null terminated, but we append a | |
682 | null suffix to the copy to avoid problems with the existing | |
683 | attr package, which doesn't view the null terminator as part | |
684 | of the attribute value. */ | |
685 | scontext2 = kmalloc(scontext_len+1,GFP_KERNEL); | |
686 | if (!scontext2) { | |
687 | rc = -ENOMEM; | |
688 | goto out; | |
689 | } | |
690 | memcpy(scontext2, scontext, scontext_len); | |
691 | scontext2[scontext_len] = 0; | |
692 | ||
693 | context_init(&context); | |
694 | *sid = SECSID_NULL; | |
695 | ||
696 | POLICY_RDLOCK; | |
697 | ||
698 | /* Parse the security context. */ | |
699 | ||
700 | rc = -EINVAL; | |
701 | scontextp = (char *) scontext2; | |
702 | ||
703 | /* Extract the user. */ | |
704 | p = scontextp; | |
705 | while (*p && *p != ':') | |
706 | p++; | |
707 | ||
708 | if (*p == 0) | |
709 | goto out_unlock; | |
710 | ||
711 | *p++ = 0; | |
712 | ||
713 | usrdatum = hashtab_search(policydb.p_users.table, scontextp); | |
714 | if (!usrdatum) | |
715 | goto out_unlock; | |
716 | ||
717 | context.user = usrdatum->value; | |
718 | ||
719 | /* Extract role. */ | |
720 | scontextp = p; | |
721 | while (*p && *p != ':') | |
722 | p++; | |
723 | ||
724 | if (*p == 0) | |
725 | goto out_unlock; | |
726 | ||
727 | *p++ = 0; | |
728 | ||
729 | role = hashtab_search(policydb.p_roles.table, scontextp); | |
730 | if (!role) | |
731 | goto out_unlock; | |
732 | context.role = role->value; | |
733 | ||
734 | /* Extract type. */ | |
735 | scontextp = p; | |
736 | while (*p && *p != ':') | |
737 | p++; | |
738 | oldc = *p; | |
739 | *p++ = 0; | |
740 | ||
741 | typdatum = hashtab_search(policydb.p_types.table, scontextp); | |
742 | if (!typdatum) | |
743 | goto out_unlock; | |
744 | ||
745 | context.type = typdatum->value; | |
746 | ||
f5c1d5b2 | 747 | rc = mls_context_to_sid(oldc, &p, &context, &sidtab, def_sid); |
1da177e4 LT |
748 | if (rc) |
749 | goto out_unlock; | |
750 | ||
751 | if ((p - scontext2) < scontext_len) { | |
752 | rc = -EINVAL; | |
753 | goto out_unlock; | |
754 | } | |
755 | ||
756 | /* Check the validity of the new context. */ | |
757 | if (!policydb_context_isvalid(&policydb, &context)) { | |
758 | rc = -EINVAL; | |
759 | goto out_unlock; | |
760 | } | |
761 | /* Obtain the new sid. */ | |
762 | rc = sidtab_context_to_sid(&sidtab, &context, sid); | |
763 | out_unlock: | |
764 | POLICY_RDUNLOCK; | |
765 | context_destroy(&context); | |
766 | kfree(scontext2); | |
767 | out: | |
768 | return rc; | |
769 | } | |
770 | ||
f5c1d5b2 JM |
771 | /** |
772 | * security_context_to_sid - Obtain a SID for a given security context. | |
773 | * @scontext: security context | |
774 | * @scontext_len: length in bytes | |
775 | * @sid: security identifier, SID | |
776 | * | |
777 | * Obtains a SID associated with the security context that | |
778 | * has the string representation specified by @scontext. | |
779 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
780 | * memory is available, or 0 on success. | |
781 | */ | |
782 | int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid) | |
783 | { | |
784 | return security_context_to_sid_core(scontext, scontext_len, | |
785 | sid, SECSID_NULL); | |
786 | } | |
787 | ||
788 | /** | |
789 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
790 | * falling back to specified default if needed. | |
791 | * | |
792 | * @scontext: security context | |
793 | * @scontext_len: length in bytes | |
794 | * @sid: security identifier, SID | |
795 | * @def_sid: default SID to assign on errror | |
796 | * | |
797 | * Obtains a SID associated with the security context that | |
798 | * has the string representation specified by @scontext. | |
799 | * The default SID is passed to the MLS layer to be used to allow | |
800 | * kernel labeling of the MLS field if the MLS field is not present | |
801 | * (for upgrading to MLS without full relabel). | |
802 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
803 | * memory is available, or 0 on success. | |
804 | */ | |
805 | int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid) | |
806 | { | |
807 | return security_context_to_sid_core(scontext, scontext_len, | |
808 | sid, def_sid); | |
809 | } | |
810 | ||
1da177e4 LT |
811 | static int compute_sid_handle_invalid_context( |
812 | struct context *scontext, | |
813 | struct context *tcontext, | |
814 | u16 tclass, | |
815 | struct context *newcontext) | |
816 | { | |
817 | char *s = NULL, *t = NULL, *n = NULL; | |
818 | u32 slen, tlen, nlen; | |
819 | ||
820 | if (context_struct_to_string(scontext, &s, &slen) < 0) | |
821 | goto out; | |
822 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
823 | goto out; | |
824 | if (context_struct_to_string(newcontext, &n, &nlen) < 0) | |
825 | goto out; | |
9ad9ad38 | 826 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
827 | "security_compute_sid: invalid context %s" |
828 | " for scontext=%s" | |
829 | " tcontext=%s" | |
830 | " tclass=%s", | |
831 | n, s, t, policydb.p_class_val_to_name[tclass-1]); | |
832 | out: | |
833 | kfree(s); | |
834 | kfree(t); | |
835 | kfree(n); | |
836 | if (!selinux_enforcing) | |
837 | return 0; | |
838 | return -EACCES; | |
839 | } | |
840 | ||
841 | static int security_compute_sid(u32 ssid, | |
842 | u32 tsid, | |
843 | u16 tclass, | |
844 | u32 specified, | |
845 | u32 *out_sid) | |
846 | { | |
847 | struct context *scontext = NULL, *tcontext = NULL, newcontext; | |
848 | struct role_trans *roletr = NULL; | |
849 | struct avtab_key avkey; | |
850 | struct avtab_datum *avdatum; | |
851 | struct avtab_node *node; | |
1da177e4 LT |
852 | int rc = 0; |
853 | ||
854 | if (!ss_initialized) { | |
855 | switch (tclass) { | |
856 | case SECCLASS_PROCESS: | |
857 | *out_sid = ssid; | |
858 | break; | |
859 | default: | |
860 | *out_sid = tsid; | |
861 | break; | |
862 | } | |
863 | goto out; | |
864 | } | |
865 | ||
851f8a69 VY |
866 | context_init(&newcontext); |
867 | ||
1da177e4 LT |
868 | POLICY_RDLOCK; |
869 | ||
870 | scontext = sidtab_search(&sidtab, ssid); | |
871 | if (!scontext) { | |
872 | printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n", | |
873 | ssid); | |
874 | rc = -EINVAL; | |
875 | goto out_unlock; | |
876 | } | |
877 | tcontext = sidtab_search(&sidtab, tsid); | |
878 | if (!tcontext) { | |
879 | printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n", | |
880 | tsid); | |
881 | rc = -EINVAL; | |
882 | goto out_unlock; | |
883 | } | |
884 | ||
1da177e4 LT |
885 | /* Set the user identity. */ |
886 | switch (specified) { | |
887 | case AVTAB_TRANSITION: | |
888 | case AVTAB_CHANGE: | |
889 | /* Use the process user identity. */ | |
890 | newcontext.user = scontext->user; | |
891 | break; | |
892 | case AVTAB_MEMBER: | |
893 | /* Use the related object owner. */ | |
894 | newcontext.user = tcontext->user; | |
895 | break; | |
896 | } | |
897 | ||
898 | /* Set the role and type to default values. */ | |
899 | switch (tclass) { | |
900 | case SECCLASS_PROCESS: | |
901 | /* Use the current role and type of process. */ | |
902 | newcontext.role = scontext->role; | |
903 | newcontext.type = scontext->type; | |
904 | break; | |
905 | default: | |
906 | /* Use the well-defined object role. */ | |
907 | newcontext.role = OBJECT_R_VAL; | |
908 | /* Use the type of the related object. */ | |
909 | newcontext.type = tcontext->type; | |
910 | } | |
911 | ||
912 | /* Look for a type transition/member/change rule. */ | |
913 | avkey.source_type = scontext->type; | |
914 | avkey.target_type = tcontext->type; | |
915 | avkey.target_class = tclass; | |
782ebb99 SS |
916 | avkey.specified = specified; |
917 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
918 | |
919 | /* If no permanent rule, also check for enabled conditional rules */ | |
920 | if(!avdatum) { | |
782ebb99 | 921 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
1da177e4 | 922 | for (; node != NULL; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 923 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
924 | avdatum = &node->datum; |
925 | break; | |
926 | } | |
927 | } | |
928 | } | |
929 | ||
782ebb99 | 930 | if (avdatum) { |
1da177e4 | 931 | /* Use the type from the type transition/member/change rule. */ |
782ebb99 | 932 | newcontext.type = avdatum->data; |
1da177e4 LT |
933 | } |
934 | ||
935 | /* Check for class-specific changes. */ | |
936 | switch (tclass) { | |
937 | case SECCLASS_PROCESS: | |
938 | if (specified & AVTAB_TRANSITION) { | |
939 | /* Look for a role transition rule. */ | |
940 | for (roletr = policydb.role_tr; roletr; | |
941 | roletr = roletr->next) { | |
942 | if (roletr->role == scontext->role && | |
943 | roletr->type == tcontext->type) { | |
944 | /* Use the role transition rule. */ | |
945 | newcontext.role = roletr->new_role; | |
946 | break; | |
947 | } | |
948 | } | |
949 | } | |
950 | break; | |
951 | default: | |
952 | break; | |
953 | } | |
954 | ||
955 | /* Set the MLS attributes. | |
956 | This is done last because it may allocate memory. */ | |
957 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext); | |
958 | if (rc) | |
959 | goto out_unlock; | |
960 | ||
961 | /* Check the validity of the context. */ | |
962 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
963 | rc = compute_sid_handle_invalid_context(scontext, | |
964 | tcontext, | |
965 | tclass, | |
966 | &newcontext); | |
967 | if (rc) | |
968 | goto out_unlock; | |
969 | } | |
970 | /* Obtain the sid for the context. */ | |
971 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
972 | out_unlock: | |
973 | POLICY_RDUNLOCK; | |
974 | context_destroy(&newcontext); | |
975 | out: | |
976 | return rc; | |
977 | } | |
978 | ||
979 | /** | |
980 | * security_transition_sid - Compute the SID for a new subject/object. | |
981 | * @ssid: source security identifier | |
982 | * @tsid: target security identifier | |
983 | * @tclass: target security class | |
984 | * @out_sid: security identifier for new subject/object | |
985 | * | |
986 | * Compute a SID to use for labeling a new subject or object in the | |
987 | * class @tclass based on a SID pair (@ssid, @tsid). | |
988 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
989 | * if insufficient memory is available, or %0 if the new SID was | |
990 | * computed successfully. | |
991 | */ | |
992 | int security_transition_sid(u32 ssid, | |
993 | u32 tsid, | |
994 | u16 tclass, | |
995 | u32 *out_sid) | |
996 | { | |
997 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid); | |
998 | } | |
999 | ||
1000 | /** | |
1001 | * security_member_sid - Compute the SID for member selection. | |
1002 | * @ssid: source security identifier | |
1003 | * @tsid: target security identifier | |
1004 | * @tclass: target security class | |
1005 | * @out_sid: security identifier for selected member | |
1006 | * | |
1007 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1008 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1009 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1010 | * if insufficient memory is available, or %0 if the SID was | |
1011 | * computed successfully. | |
1012 | */ | |
1013 | int security_member_sid(u32 ssid, | |
1014 | u32 tsid, | |
1015 | u16 tclass, | |
1016 | u32 *out_sid) | |
1017 | { | |
1018 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid); | |
1019 | } | |
1020 | ||
1021 | /** | |
1022 | * security_change_sid - Compute the SID for object relabeling. | |
1023 | * @ssid: source security identifier | |
1024 | * @tsid: target security identifier | |
1025 | * @tclass: target security class | |
1026 | * @out_sid: security identifier for selected member | |
1027 | * | |
1028 | * Compute a SID to use for relabeling an object of class @tclass | |
1029 | * based on a SID pair (@ssid, @tsid). | |
1030 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1031 | * if insufficient memory is available, or %0 if the SID was | |
1032 | * computed successfully. | |
1033 | */ | |
1034 | int security_change_sid(u32 ssid, | |
1035 | u32 tsid, | |
1036 | u16 tclass, | |
1037 | u32 *out_sid) | |
1038 | { | |
1039 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid); | |
1040 | } | |
1041 | ||
b94c7e67 CS |
1042 | /* |
1043 | * Verify that each kernel class that is defined in the | |
1044 | * policy is correct | |
1045 | */ | |
1046 | static int validate_classes(struct policydb *p) | |
1047 | { | |
1048 | int i, j; | |
1049 | struct class_datum *cladatum; | |
1050 | struct perm_datum *perdatum; | |
1051 | u32 nprim, tmp, common_pts_len, perm_val, pol_val; | |
1052 | u16 class_val; | |
1053 | const struct selinux_class_perm *kdefs = &selinux_class_perm; | |
1054 | const char *def_class, *def_perm, *pol_class; | |
1055 | struct symtab *perms; | |
1056 | ||
1057 | for (i = 1; i < kdefs->cts_len; i++) { | |
1058 | def_class = kdefs->class_to_string[i]; | |
a764ae4b SS |
1059 | if (!def_class) |
1060 | continue; | |
b94c7e67 CS |
1061 | if (i > p->p_classes.nprim) { |
1062 | printk(KERN_INFO | |
1063 | "security: class %s not defined in policy\n", | |
1064 | def_class); | |
1065 | continue; | |
1066 | } | |
1067 | pol_class = p->p_class_val_to_name[i-1]; | |
1068 | if (strcmp(pol_class, def_class)) { | |
1069 | printk(KERN_ERR | |
1070 | "security: class %d is incorrect, found %s but should be %s\n", | |
1071 | i, pol_class, def_class); | |
1072 | return -EINVAL; | |
1073 | } | |
1074 | } | |
1075 | for (i = 0; i < kdefs->av_pts_len; i++) { | |
1076 | class_val = kdefs->av_perm_to_string[i].tclass; | |
1077 | perm_val = kdefs->av_perm_to_string[i].value; | |
1078 | def_perm = kdefs->av_perm_to_string[i].name; | |
1079 | if (class_val > p->p_classes.nprim) | |
1080 | continue; | |
1081 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1082 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1083 | BUG_ON(!cladatum); | |
1084 | perms = &cladatum->permissions; | |
1085 | nprim = 1 << (perms->nprim - 1); | |
1086 | if (perm_val > nprim) { | |
1087 | printk(KERN_INFO | |
1088 | "security: permission %s in class %s not defined in policy\n", | |
1089 | def_perm, pol_class); | |
1090 | continue; | |
1091 | } | |
1092 | perdatum = hashtab_search(perms->table, def_perm); | |
1093 | if (perdatum == NULL) { | |
1094 | printk(KERN_ERR | |
1095 | "security: permission %s in class %s not found in policy\n", | |
1096 | def_perm, pol_class); | |
1097 | return -EINVAL; | |
1098 | } | |
1099 | pol_val = 1 << (perdatum->value - 1); | |
1100 | if (pol_val != perm_val) { | |
1101 | printk(KERN_ERR | |
1102 | "security: permission %s in class %s has incorrect value\n", | |
1103 | def_perm, pol_class); | |
1104 | return -EINVAL; | |
1105 | } | |
1106 | } | |
1107 | for (i = 0; i < kdefs->av_inherit_len; i++) { | |
1108 | class_val = kdefs->av_inherit[i].tclass; | |
1109 | if (class_val > p->p_classes.nprim) | |
1110 | continue; | |
1111 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1112 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1113 | BUG_ON(!cladatum); | |
1114 | if (!cladatum->comdatum) { | |
1115 | printk(KERN_ERR | |
1116 | "security: class %s should have an inherits clause but does not\n", | |
1117 | pol_class); | |
1118 | return -EINVAL; | |
1119 | } | |
1120 | tmp = kdefs->av_inherit[i].common_base; | |
1121 | common_pts_len = 0; | |
1122 | while (!(tmp & 0x01)) { | |
1123 | common_pts_len++; | |
1124 | tmp >>= 1; | |
1125 | } | |
1126 | perms = &cladatum->comdatum->permissions; | |
1127 | for (j = 0; j < common_pts_len; j++) { | |
1128 | def_perm = kdefs->av_inherit[i].common_pts[j]; | |
1129 | if (j >= perms->nprim) { | |
1130 | printk(KERN_INFO | |
1131 | "security: permission %s in class %s not defined in policy\n", | |
1132 | def_perm, pol_class); | |
1133 | continue; | |
1134 | } | |
1135 | perdatum = hashtab_search(perms->table, def_perm); | |
1136 | if (perdatum == NULL) { | |
1137 | printk(KERN_ERR | |
1138 | "security: permission %s in class %s not found in policy\n", | |
1139 | def_perm, pol_class); | |
1140 | return -EINVAL; | |
1141 | } | |
1142 | if (perdatum->value != j + 1) { | |
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 | } | |
1150 | return 0; | |
1151 | } | |
1152 | ||
1da177e4 LT |
1153 | /* Clone the SID into the new SID table. */ |
1154 | static int clone_sid(u32 sid, | |
1155 | struct context *context, | |
1156 | void *arg) | |
1157 | { | |
1158 | struct sidtab *s = arg; | |
1159 | ||
1160 | return sidtab_insert(s, sid, context); | |
1161 | } | |
1162 | ||
1163 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1164 | { | |
1165 | int rc = 0; | |
1166 | ||
1167 | if (selinux_enforcing) { | |
1168 | rc = -EINVAL; | |
1169 | } else { | |
1170 | char *s; | |
1171 | u32 len; | |
1172 | ||
1173 | context_struct_to_string(context, &s, &len); | |
1174 | printk(KERN_ERR "security: context %s is invalid\n", s); | |
1175 | kfree(s); | |
1176 | } | |
1177 | return rc; | |
1178 | } | |
1179 | ||
1180 | struct convert_context_args { | |
1181 | struct policydb *oldp; | |
1182 | struct policydb *newp; | |
1183 | }; | |
1184 | ||
1185 | /* | |
1186 | * Convert the values in the security context | |
1187 | * structure `c' from the values specified | |
1188 | * in the policy `p->oldp' to the values specified | |
1189 | * in the policy `p->newp'. Verify that the | |
1190 | * context is valid under the new policy. | |
1191 | */ | |
1192 | static int convert_context(u32 key, | |
1193 | struct context *c, | |
1194 | void *p) | |
1195 | { | |
1196 | struct convert_context_args *args; | |
1197 | struct context oldc; | |
1198 | struct role_datum *role; | |
1199 | struct type_datum *typdatum; | |
1200 | struct user_datum *usrdatum; | |
1201 | char *s; | |
1202 | u32 len; | |
1203 | int rc; | |
1204 | ||
1205 | args = p; | |
1206 | ||
1207 | rc = context_cpy(&oldc, c); | |
1208 | if (rc) | |
1209 | goto out; | |
1210 | ||
1211 | rc = -EINVAL; | |
1212 | ||
1213 | /* Convert the user. */ | |
1214 | usrdatum = hashtab_search(args->newp->p_users.table, | |
1215 | args->oldp->p_user_val_to_name[c->user - 1]); | |
1216 | if (!usrdatum) { | |
1217 | goto bad; | |
1218 | } | |
1219 | c->user = usrdatum->value; | |
1220 | ||
1221 | /* Convert the role. */ | |
1222 | role = hashtab_search(args->newp->p_roles.table, | |
1223 | args->oldp->p_role_val_to_name[c->role - 1]); | |
1224 | if (!role) { | |
1225 | goto bad; | |
1226 | } | |
1227 | c->role = role->value; | |
1228 | ||
1229 | /* Convert the type. */ | |
1230 | typdatum = hashtab_search(args->newp->p_types.table, | |
1231 | args->oldp->p_type_val_to_name[c->type - 1]); | |
1232 | if (!typdatum) { | |
1233 | goto bad; | |
1234 | } | |
1235 | c->type = typdatum->value; | |
1236 | ||
1237 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1238 | if (rc) | |
1239 | goto bad; | |
1240 | ||
1241 | /* Check the validity of the new context. */ | |
1242 | if (!policydb_context_isvalid(args->newp, c)) { | |
1243 | rc = convert_context_handle_invalid_context(&oldc); | |
1244 | if (rc) | |
1245 | goto bad; | |
1246 | } | |
1247 | ||
1248 | context_destroy(&oldc); | |
1249 | out: | |
1250 | return rc; | |
1251 | bad: | |
1252 | context_struct_to_string(&oldc, &s, &len); | |
1253 | context_destroy(&oldc); | |
1254 | printk(KERN_ERR "security: invalidating context %s\n", s); | |
1255 | kfree(s); | |
1256 | goto out; | |
1257 | } | |
1258 | ||
1259 | extern void selinux_complete_init(void); | |
e900a7d9 | 1260 | static int security_preserve_bools(struct policydb *p); |
1da177e4 LT |
1261 | |
1262 | /** | |
1263 | * security_load_policy - Load a security policy configuration. | |
1264 | * @data: binary policy data | |
1265 | * @len: length of data in bytes | |
1266 | * | |
1267 | * Load a new set of security policy configuration data, | |
1268 | * validate it and convert the SID table as necessary. | |
1269 | * This function will flush the access vector cache after | |
1270 | * loading the new policy. | |
1271 | */ | |
1272 | int security_load_policy(void *data, size_t len) | |
1273 | { | |
1274 | struct policydb oldpolicydb, newpolicydb; | |
1275 | struct sidtab oldsidtab, newsidtab; | |
1276 | struct convert_context_args args; | |
1277 | u32 seqno; | |
1278 | int rc = 0; | |
1279 | struct policy_file file = { data, len }, *fp = &file; | |
1280 | ||
1281 | LOAD_LOCK; | |
1282 | ||
1283 | if (!ss_initialized) { | |
1284 | avtab_cache_init(); | |
1285 | if (policydb_read(&policydb, fp)) { | |
1286 | LOAD_UNLOCK; | |
1287 | avtab_cache_destroy(); | |
1288 | return -EINVAL; | |
1289 | } | |
1290 | if (policydb_load_isids(&policydb, &sidtab)) { | |
1291 | LOAD_UNLOCK; | |
1292 | policydb_destroy(&policydb); | |
1293 | avtab_cache_destroy(); | |
1294 | return -EINVAL; | |
1295 | } | |
b94c7e67 CS |
1296 | /* Verify that the kernel defined classes are correct. */ |
1297 | if (validate_classes(&policydb)) { | |
1298 | printk(KERN_ERR | |
1299 | "security: the definition of a class is incorrect\n"); | |
1300 | LOAD_UNLOCK; | |
1301 | sidtab_destroy(&sidtab); | |
1302 | policydb_destroy(&policydb); | |
1303 | avtab_cache_destroy(); | |
1304 | return -EINVAL; | |
1305 | } | |
1da177e4 LT |
1306 | policydb_loaded_version = policydb.policyvers; |
1307 | ss_initialized = 1; | |
4c443d1b | 1308 | seqno = ++latest_granting; |
1da177e4 LT |
1309 | LOAD_UNLOCK; |
1310 | selinux_complete_init(); | |
4c443d1b SS |
1311 | avc_ss_reset(seqno); |
1312 | selnl_notify_policyload(seqno); | |
7420ed23 | 1313 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1314 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1315 | return 0; |
1316 | } | |
1317 | ||
1318 | #if 0 | |
1319 | sidtab_hash_eval(&sidtab, "sids"); | |
1320 | #endif | |
1321 | ||
1322 | if (policydb_read(&newpolicydb, fp)) { | |
1323 | LOAD_UNLOCK; | |
1324 | return -EINVAL; | |
1325 | } | |
1326 | ||
1327 | sidtab_init(&newsidtab); | |
1328 | ||
b94c7e67 CS |
1329 | /* Verify that the kernel defined classes are correct. */ |
1330 | if (validate_classes(&newpolicydb)) { | |
1331 | printk(KERN_ERR | |
1332 | "security: the definition of a class is incorrect\n"); | |
1333 | rc = -EINVAL; | |
1334 | goto err; | |
1335 | } | |
1336 | ||
e900a7d9 SS |
1337 | rc = security_preserve_bools(&newpolicydb); |
1338 | if (rc) { | |
1339 | printk(KERN_ERR "security: unable to preserve booleans\n"); | |
1340 | goto err; | |
1341 | } | |
1342 | ||
1da177e4 LT |
1343 | /* Clone the SID table. */ |
1344 | sidtab_shutdown(&sidtab); | |
1345 | if (sidtab_map(&sidtab, clone_sid, &newsidtab)) { | |
1346 | rc = -ENOMEM; | |
1347 | goto err; | |
1348 | } | |
1349 | ||
1350 | /* Convert the internal representations of contexts | |
1351 | in the new SID table and remove invalid SIDs. */ | |
1352 | args.oldp = &policydb; | |
1353 | args.newp = &newpolicydb; | |
1354 | sidtab_map_remove_on_error(&newsidtab, convert_context, &args); | |
1355 | ||
1356 | /* Save the old policydb and SID table to free later. */ | |
1357 | memcpy(&oldpolicydb, &policydb, sizeof policydb); | |
1358 | sidtab_set(&oldsidtab, &sidtab); | |
1359 | ||
1360 | /* Install the new policydb and SID table. */ | |
1361 | POLICY_WRLOCK; | |
1362 | memcpy(&policydb, &newpolicydb, sizeof policydb); | |
1363 | sidtab_set(&sidtab, &newsidtab); | |
1364 | seqno = ++latest_granting; | |
1365 | policydb_loaded_version = policydb.policyvers; | |
1366 | POLICY_WRUNLOCK; | |
1367 | LOAD_UNLOCK; | |
1368 | ||
1369 | /* Free the old policydb and SID table. */ | |
1370 | policydb_destroy(&oldpolicydb); | |
1371 | sidtab_destroy(&oldsidtab); | |
1372 | ||
1373 | avc_ss_reset(seqno); | |
1374 | selnl_notify_policyload(seqno); | |
7420ed23 | 1375 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1376 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1377 | |
1378 | return 0; | |
1379 | ||
1380 | err: | |
1381 | LOAD_UNLOCK; | |
1382 | sidtab_destroy(&newsidtab); | |
1383 | policydb_destroy(&newpolicydb); | |
1384 | return rc; | |
1385 | ||
1386 | } | |
1387 | ||
1388 | /** | |
1389 | * security_port_sid - Obtain the SID for a port. | |
1390 | * @domain: communication domain aka address family | |
1391 | * @type: socket type | |
1392 | * @protocol: protocol number | |
1393 | * @port: port number | |
1394 | * @out_sid: security identifier | |
1395 | */ | |
1396 | int security_port_sid(u16 domain, | |
1397 | u16 type, | |
1398 | u8 protocol, | |
1399 | u16 port, | |
1400 | u32 *out_sid) | |
1401 | { | |
1402 | struct ocontext *c; | |
1403 | int rc = 0; | |
1404 | ||
1405 | POLICY_RDLOCK; | |
1406 | ||
1407 | c = policydb.ocontexts[OCON_PORT]; | |
1408 | while (c) { | |
1409 | if (c->u.port.protocol == protocol && | |
1410 | c->u.port.low_port <= port && | |
1411 | c->u.port.high_port >= port) | |
1412 | break; | |
1413 | c = c->next; | |
1414 | } | |
1415 | ||
1416 | if (c) { | |
1417 | if (!c->sid[0]) { | |
1418 | rc = sidtab_context_to_sid(&sidtab, | |
1419 | &c->context[0], | |
1420 | &c->sid[0]); | |
1421 | if (rc) | |
1422 | goto out; | |
1423 | } | |
1424 | *out_sid = c->sid[0]; | |
1425 | } else { | |
1426 | *out_sid = SECINITSID_PORT; | |
1427 | } | |
1428 | ||
1429 | out: | |
1430 | POLICY_RDUNLOCK; | |
1431 | return rc; | |
1432 | } | |
1433 | ||
1434 | /** | |
1435 | * security_netif_sid - Obtain the SID for a network interface. | |
1436 | * @name: interface name | |
1437 | * @if_sid: interface SID | |
1438 | * @msg_sid: default SID for received packets | |
1439 | */ | |
1440 | int security_netif_sid(char *name, | |
1441 | u32 *if_sid, | |
1442 | u32 *msg_sid) | |
1443 | { | |
1444 | int rc = 0; | |
1445 | struct ocontext *c; | |
1446 | ||
1447 | POLICY_RDLOCK; | |
1448 | ||
1449 | c = policydb.ocontexts[OCON_NETIF]; | |
1450 | while (c) { | |
1451 | if (strcmp(name, c->u.name) == 0) | |
1452 | break; | |
1453 | c = c->next; | |
1454 | } | |
1455 | ||
1456 | if (c) { | |
1457 | if (!c->sid[0] || !c->sid[1]) { | |
1458 | rc = sidtab_context_to_sid(&sidtab, | |
1459 | &c->context[0], | |
1460 | &c->sid[0]); | |
1461 | if (rc) | |
1462 | goto out; | |
1463 | rc = sidtab_context_to_sid(&sidtab, | |
1464 | &c->context[1], | |
1465 | &c->sid[1]); | |
1466 | if (rc) | |
1467 | goto out; | |
1468 | } | |
1469 | *if_sid = c->sid[0]; | |
1470 | *msg_sid = c->sid[1]; | |
1471 | } else { | |
1472 | *if_sid = SECINITSID_NETIF; | |
1473 | *msg_sid = SECINITSID_NETMSG; | |
1474 | } | |
1475 | ||
1476 | out: | |
1477 | POLICY_RDUNLOCK; | |
1478 | return rc; | |
1479 | } | |
1480 | ||
1481 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
1482 | { | |
1483 | int i, fail = 0; | |
1484 | ||
1485 | for(i = 0; i < 4; i++) | |
1486 | if(addr[i] != (input[i] & mask[i])) { | |
1487 | fail = 1; | |
1488 | break; | |
1489 | } | |
1490 | ||
1491 | return !fail; | |
1492 | } | |
1493 | ||
1494 | /** | |
1495 | * security_node_sid - Obtain the SID for a node (host). | |
1496 | * @domain: communication domain aka address family | |
1497 | * @addrp: address | |
1498 | * @addrlen: address length in bytes | |
1499 | * @out_sid: security identifier | |
1500 | */ | |
1501 | int security_node_sid(u16 domain, | |
1502 | void *addrp, | |
1503 | u32 addrlen, | |
1504 | u32 *out_sid) | |
1505 | { | |
1506 | int rc = 0; | |
1507 | struct ocontext *c; | |
1508 | ||
1509 | POLICY_RDLOCK; | |
1510 | ||
1511 | switch (domain) { | |
1512 | case AF_INET: { | |
1513 | u32 addr; | |
1514 | ||
1515 | if (addrlen != sizeof(u32)) { | |
1516 | rc = -EINVAL; | |
1517 | goto out; | |
1518 | } | |
1519 | ||
1520 | addr = *((u32 *)addrp); | |
1521 | ||
1522 | c = policydb.ocontexts[OCON_NODE]; | |
1523 | while (c) { | |
1524 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
1525 | break; | |
1526 | c = c->next; | |
1527 | } | |
1528 | break; | |
1529 | } | |
1530 | ||
1531 | case AF_INET6: | |
1532 | if (addrlen != sizeof(u64) * 2) { | |
1533 | rc = -EINVAL; | |
1534 | goto out; | |
1535 | } | |
1536 | c = policydb.ocontexts[OCON_NODE6]; | |
1537 | while (c) { | |
1538 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
1539 | c->u.node6.mask)) | |
1540 | break; | |
1541 | c = c->next; | |
1542 | } | |
1543 | break; | |
1544 | ||
1545 | default: | |
1546 | *out_sid = SECINITSID_NODE; | |
1547 | goto out; | |
1548 | } | |
1549 | ||
1550 | if (c) { | |
1551 | if (!c->sid[0]) { | |
1552 | rc = sidtab_context_to_sid(&sidtab, | |
1553 | &c->context[0], | |
1554 | &c->sid[0]); | |
1555 | if (rc) | |
1556 | goto out; | |
1557 | } | |
1558 | *out_sid = c->sid[0]; | |
1559 | } else { | |
1560 | *out_sid = SECINITSID_NODE; | |
1561 | } | |
1562 | ||
1563 | out: | |
1564 | POLICY_RDUNLOCK; | |
1565 | return rc; | |
1566 | } | |
1567 | ||
1568 | #define SIDS_NEL 25 | |
1569 | ||
1570 | /** | |
1571 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
1572 | * @fromsid: starting SID | |
1573 | * @username: username | |
1574 | * @sids: array of reachable SIDs for user | |
1575 | * @nel: number of elements in @sids | |
1576 | * | |
1577 | * Generate the set of SIDs for legal security contexts | |
1578 | * for a given user that can be reached by @fromsid. | |
1579 | * Set *@sids to point to a dynamically allocated | |
1580 | * array containing the set of SIDs. Set *@nel to the | |
1581 | * number of elements in the array. | |
1582 | */ | |
1583 | ||
1584 | int security_get_user_sids(u32 fromsid, | |
1585 | char *username, | |
1586 | u32 **sids, | |
1587 | u32 *nel) | |
1588 | { | |
1589 | struct context *fromcon, usercon; | |
2c3c05db | 1590 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
1591 | u32 mynel = 0, maxnel = SIDS_NEL; |
1592 | struct user_datum *user; | |
1593 | struct role_datum *role; | |
782ebb99 | 1594 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
1595 | int rc = 0, i, j; |
1596 | ||
2c3c05db SS |
1597 | *sids = NULL; |
1598 | *nel = 0; | |
1599 | ||
1600 | if (!ss_initialized) | |
1da177e4 | 1601 | goto out; |
1da177e4 LT |
1602 | |
1603 | POLICY_RDLOCK; | |
1604 | ||
1605 | fromcon = sidtab_search(&sidtab, fromsid); | |
1606 | if (!fromcon) { | |
1607 | rc = -EINVAL; | |
1608 | goto out_unlock; | |
1609 | } | |
1610 | ||
1611 | user = hashtab_search(policydb.p_users.table, username); | |
1612 | if (!user) { | |
1613 | rc = -EINVAL; | |
1614 | goto out_unlock; | |
1615 | } | |
1616 | usercon.user = user->value; | |
1617 | ||
89d155ef | 1618 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
1da177e4 LT |
1619 | if (!mysids) { |
1620 | rc = -ENOMEM; | |
1621 | goto out_unlock; | |
1622 | } | |
1da177e4 | 1623 | |
782ebb99 SS |
1624 | ebitmap_for_each_bit(&user->roles, rnode, i) { |
1625 | if (!ebitmap_node_get_bit(rnode, i)) | |
1da177e4 LT |
1626 | continue; |
1627 | role = policydb.role_val_to_struct[i]; | |
1628 | usercon.role = i+1; | |
782ebb99 SS |
1629 | ebitmap_for_each_bit(&role->types, tnode, j) { |
1630 | if (!ebitmap_node_get_bit(tnode, j)) | |
1da177e4 LT |
1631 | continue; |
1632 | usercon.type = j+1; | |
1633 | ||
1634 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
1635 | continue; | |
1636 | ||
1da177e4 | 1637 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
2c3c05db | 1638 | if (rc) |
1da177e4 | 1639 | goto out_unlock; |
1da177e4 LT |
1640 | if (mynel < maxnel) { |
1641 | mysids[mynel++] = sid; | |
1642 | } else { | |
1643 | maxnel += SIDS_NEL; | |
89d155ef | 1644 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
1da177e4 LT |
1645 | if (!mysids2) { |
1646 | rc = -ENOMEM; | |
1da177e4 LT |
1647 | goto out_unlock; |
1648 | } | |
1da177e4 LT |
1649 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
1650 | kfree(mysids); | |
1651 | mysids = mysids2; | |
1652 | mysids[mynel++] = sid; | |
1653 | } | |
1654 | } | |
1655 | } | |
1656 | ||
1da177e4 LT |
1657 | out_unlock: |
1658 | POLICY_RDUNLOCK; | |
2c3c05db SS |
1659 | if (rc || !mynel) { |
1660 | kfree(mysids); | |
1661 | goto out; | |
1662 | } | |
1663 | ||
1664 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); | |
1665 | if (!mysids2) { | |
1666 | rc = -ENOMEM; | |
1667 | kfree(mysids); | |
1668 | goto out; | |
1669 | } | |
1670 | for (i = 0, j = 0; i < mynel; i++) { | |
1671 | rc = avc_has_perm_noaudit(fromsid, mysids[i], | |
1672 | SECCLASS_PROCESS, | |
1673 | PROCESS__TRANSITION, AVC_STRICT, | |
1674 | NULL); | |
1675 | if (!rc) | |
1676 | mysids2[j++] = mysids[i]; | |
1677 | cond_resched(); | |
1678 | } | |
1679 | rc = 0; | |
1680 | kfree(mysids); | |
1681 | *sids = mysids2; | |
1682 | *nel = j; | |
1da177e4 LT |
1683 | out: |
1684 | return rc; | |
1685 | } | |
1686 | ||
1687 | /** | |
1688 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
1689 | * @fstype: filesystem type | |
1690 | * @path: path from root of mount | |
1691 | * @sclass: file security class | |
1692 | * @sid: SID for path | |
1693 | * | |
1694 | * Obtain a SID to use for a file in a filesystem that | |
1695 | * cannot support xattr or use a fixed labeling behavior like | |
1696 | * transition SIDs or task SIDs. | |
1697 | */ | |
1698 | int security_genfs_sid(const char *fstype, | |
1699 | char *path, | |
1700 | u16 sclass, | |
1701 | u32 *sid) | |
1702 | { | |
1703 | int len; | |
1704 | struct genfs *genfs; | |
1705 | struct ocontext *c; | |
1706 | int rc = 0, cmp = 0; | |
1707 | ||
1708 | POLICY_RDLOCK; | |
1709 | ||
1710 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { | |
1711 | cmp = strcmp(fstype, genfs->fstype); | |
1712 | if (cmp <= 0) | |
1713 | break; | |
1714 | } | |
1715 | ||
1716 | if (!genfs || cmp) { | |
1717 | *sid = SECINITSID_UNLABELED; | |
1718 | rc = -ENOENT; | |
1719 | goto out; | |
1720 | } | |
1721 | ||
1722 | for (c = genfs->head; c; c = c->next) { | |
1723 | len = strlen(c->u.name); | |
1724 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
1725 | (strncmp(c->u.name, path, len) == 0)) | |
1726 | break; | |
1727 | } | |
1728 | ||
1729 | if (!c) { | |
1730 | *sid = SECINITSID_UNLABELED; | |
1731 | rc = -ENOENT; | |
1732 | goto out; | |
1733 | } | |
1734 | ||
1735 | if (!c->sid[0]) { | |
1736 | rc = sidtab_context_to_sid(&sidtab, | |
1737 | &c->context[0], | |
1738 | &c->sid[0]); | |
1739 | if (rc) | |
1740 | goto out; | |
1741 | } | |
1742 | ||
1743 | *sid = c->sid[0]; | |
1744 | out: | |
1745 | POLICY_RDUNLOCK; | |
1746 | return rc; | |
1747 | } | |
1748 | ||
1749 | /** | |
1750 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
1751 | * @fstype: filesystem type | |
1752 | * @behavior: labeling behavior | |
1753 | * @sid: SID for filesystem (superblock) | |
1754 | */ | |
1755 | int security_fs_use( | |
1756 | const char *fstype, | |
1757 | unsigned int *behavior, | |
1758 | u32 *sid) | |
1759 | { | |
1760 | int rc = 0; | |
1761 | struct ocontext *c; | |
1762 | ||
1763 | POLICY_RDLOCK; | |
1764 | ||
1765 | c = policydb.ocontexts[OCON_FSUSE]; | |
1766 | while (c) { | |
1767 | if (strcmp(fstype, c->u.name) == 0) | |
1768 | break; | |
1769 | c = c->next; | |
1770 | } | |
1771 | ||
1772 | if (c) { | |
1773 | *behavior = c->v.behavior; | |
1774 | if (!c->sid[0]) { | |
1775 | rc = sidtab_context_to_sid(&sidtab, | |
1776 | &c->context[0], | |
1777 | &c->sid[0]); | |
1778 | if (rc) | |
1779 | goto out; | |
1780 | } | |
1781 | *sid = c->sid[0]; | |
1782 | } else { | |
1783 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); | |
1784 | if (rc) { | |
1785 | *behavior = SECURITY_FS_USE_NONE; | |
1786 | rc = 0; | |
1787 | } else { | |
1788 | *behavior = SECURITY_FS_USE_GENFS; | |
1789 | } | |
1790 | } | |
1791 | ||
1792 | out: | |
1793 | POLICY_RDUNLOCK; | |
1794 | return rc; | |
1795 | } | |
1796 | ||
1797 | int security_get_bools(int *len, char ***names, int **values) | |
1798 | { | |
1799 | int i, rc = -ENOMEM; | |
1800 | ||
1801 | POLICY_RDLOCK; | |
1802 | *names = NULL; | |
1803 | *values = NULL; | |
1804 | ||
1805 | *len = policydb.p_bools.nprim; | |
1806 | if (!*len) { | |
1807 | rc = 0; | |
1808 | goto out; | |
1809 | } | |
1810 | ||
e0795cf4 | 1811 | *names = kcalloc(*len, sizeof(char*), GFP_ATOMIC); |
1da177e4 LT |
1812 | if (!*names) |
1813 | goto err; | |
1da177e4 | 1814 | |
e0795cf4 | 1815 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); |
1da177e4 LT |
1816 | if (!*values) |
1817 | goto err; | |
1818 | ||
1819 | for (i = 0; i < *len; i++) { | |
1820 | size_t name_len; | |
1821 | (*values)[i] = policydb.bool_val_to_struct[i]->state; | |
1822 | name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; | |
e0795cf4 | 1823 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); |
1da177e4 LT |
1824 | if (!(*names)[i]) |
1825 | goto err; | |
1826 | strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); | |
1827 | (*names)[i][name_len - 1] = 0; | |
1828 | } | |
1829 | rc = 0; | |
1830 | out: | |
1831 | POLICY_RDUNLOCK; | |
1832 | return rc; | |
1833 | err: | |
1834 | if (*names) { | |
1835 | for (i = 0; i < *len; i++) | |
9a5f04bf | 1836 | kfree((*names)[i]); |
1da177e4 | 1837 | } |
9a5f04bf | 1838 | kfree(*values); |
1da177e4 LT |
1839 | goto out; |
1840 | } | |
1841 | ||
1842 | ||
1843 | int security_set_bools(int len, int *values) | |
1844 | { | |
1845 | int i, rc = 0; | |
1846 | int lenp, seqno = 0; | |
1847 | struct cond_node *cur; | |
1848 | ||
1849 | POLICY_WRLOCK; | |
1850 | ||
1851 | lenp = policydb.p_bools.nprim; | |
1852 | if (len != lenp) { | |
1853 | rc = -EFAULT; | |
1854 | goto out; | |
1855 | } | |
1856 | ||
1da177e4 | 1857 | for (i = 0; i < len; i++) { |
af601e46 SG |
1858 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
1859 | audit_log(current->audit_context, GFP_ATOMIC, | |
1860 | AUDIT_MAC_CONFIG_CHANGE, | |
1861 | "bool=%s val=%d old_val=%d auid=%u", | |
1862 | policydb.p_bool_val_to_name[i], | |
1863 | !!values[i], | |
1864 | policydb.bool_val_to_struct[i]->state, | |
1865 | audit_get_loginuid(current->audit_context)); | |
1866 | } | |
1da177e4 LT |
1867 | if (values[i]) { |
1868 | policydb.bool_val_to_struct[i]->state = 1; | |
1869 | } else { | |
1870 | policydb.bool_val_to_struct[i]->state = 0; | |
1871 | } | |
1da177e4 | 1872 | } |
1da177e4 LT |
1873 | |
1874 | for (cur = policydb.cond_list; cur != NULL; cur = cur->next) { | |
1875 | rc = evaluate_cond_node(&policydb, cur); | |
1876 | if (rc) | |
1877 | goto out; | |
1878 | } | |
1879 | ||
1880 | seqno = ++latest_granting; | |
1881 | ||
1882 | out: | |
1883 | POLICY_WRUNLOCK; | |
1884 | if (!rc) { | |
1885 | avc_ss_reset(seqno); | |
1886 | selnl_notify_policyload(seqno); | |
342a0cff | 1887 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1888 | } |
1889 | return rc; | |
1890 | } | |
1891 | ||
1892 | int security_get_bool_value(int bool) | |
1893 | { | |
1894 | int rc = 0; | |
1895 | int len; | |
1896 | ||
1897 | POLICY_RDLOCK; | |
1898 | ||
1899 | len = policydb.p_bools.nprim; | |
1900 | if (bool >= len) { | |
1901 | rc = -EFAULT; | |
1902 | goto out; | |
1903 | } | |
1904 | ||
1905 | rc = policydb.bool_val_to_struct[bool]->state; | |
1906 | out: | |
1907 | POLICY_RDUNLOCK; | |
1908 | return rc; | |
1909 | } | |
376bd9cb | 1910 | |
e900a7d9 SS |
1911 | static int security_preserve_bools(struct policydb *p) |
1912 | { | |
1913 | int rc, nbools = 0, *bvalues = NULL, i; | |
1914 | char **bnames = NULL; | |
1915 | struct cond_bool_datum *booldatum; | |
1916 | struct cond_node *cur; | |
1917 | ||
1918 | rc = security_get_bools(&nbools, &bnames, &bvalues); | |
1919 | if (rc) | |
1920 | goto out; | |
1921 | for (i = 0; i < nbools; i++) { | |
1922 | booldatum = hashtab_search(p->p_bools.table, bnames[i]); | |
1923 | if (booldatum) | |
1924 | booldatum->state = bvalues[i]; | |
1925 | } | |
1926 | for (cur = p->cond_list; cur != NULL; cur = cur->next) { | |
1927 | rc = evaluate_cond_node(p, cur); | |
1928 | if (rc) | |
1929 | goto out; | |
1930 | } | |
1931 | ||
1932 | out: | |
1933 | if (bnames) { | |
1934 | for (i = 0; i < nbools; i++) | |
1935 | kfree(bnames[i]); | |
1936 | } | |
1937 | kfree(bnames); | |
1938 | kfree(bvalues); | |
1939 | return rc; | |
1940 | } | |
1941 | ||
08554d6b VY |
1942 | /* |
1943 | * security_sid_mls_copy() - computes a new sid based on the given | |
1944 | * sid and the mls portion of mls_sid. | |
1945 | */ | |
1946 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
1947 | { | |
1948 | struct context *context1; | |
1949 | struct context *context2; | |
1950 | struct context newcon; | |
1951 | char *s; | |
1952 | u32 len; | |
1953 | int rc = 0; | |
1954 | ||
4eb327b5 | 1955 | if (!ss_initialized || !selinux_mls_enabled) { |
08554d6b VY |
1956 | *new_sid = sid; |
1957 | goto out; | |
1958 | } | |
1959 | ||
1960 | context_init(&newcon); | |
1961 | ||
1962 | POLICY_RDLOCK; | |
1963 | context1 = sidtab_search(&sidtab, sid); | |
1964 | if (!context1) { | |
1965 | printk(KERN_ERR "security_sid_mls_copy: unrecognized SID " | |
1966 | "%d\n", sid); | |
1967 | rc = -EINVAL; | |
1968 | goto out_unlock; | |
1969 | } | |
1970 | ||
1971 | context2 = sidtab_search(&sidtab, mls_sid); | |
1972 | if (!context2) { | |
1973 | printk(KERN_ERR "security_sid_mls_copy: unrecognized SID " | |
1974 | "%d\n", mls_sid); | |
1975 | rc = -EINVAL; | |
1976 | goto out_unlock; | |
1977 | } | |
1978 | ||
1979 | newcon.user = context1->user; | |
1980 | newcon.role = context1->role; | |
1981 | newcon.type = context1->type; | |
0efc61ea | 1982 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
1983 | if (rc) |
1984 | goto out_unlock; | |
1985 | ||
08554d6b VY |
1986 | /* Check the validity of the new context. */ |
1987 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
1988 | rc = convert_context_handle_invalid_context(&newcon); | |
1989 | if (rc) | |
1990 | goto bad; | |
1991 | } | |
1992 | ||
1993 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
1994 | goto out_unlock; | |
1995 | ||
1996 | bad: | |
1997 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
1998 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
1999 | "security_sid_mls_copy: invalid context %s", s); | |
2000 | kfree(s); | |
2001 | } | |
2002 | ||
2003 | out_unlock: | |
2004 | POLICY_RDUNLOCK; | |
2005 | context_destroy(&newcon); | |
2006 | out: | |
2007 | return rc; | |
2008 | } | |
2009 | ||
55fcf09b CP |
2010 | static int get_classes_callback(void *k, void *d, void *args) |
2011 | { | |
2012 | struct class_datum *datum = d; | |
2013 | char *name = k, **classes = args; | |
2014 | int value = datum->value - 1; | |
2015 | ||
2016 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
2017 | if (!classes[value]) | |
2018 | return -ENOMEM; | |
2019 | ||
2020 | return 0; | |
2021 | } | |
2022 | ||
2023 | int security_get_classes(char ***classes, int *nclasses) | |
2024 | { | |
2025 | int rc = -ENOMEM; | |
2026 | ||
2027 | POLICY_RDLOCK; | |
2028 | ||
2029 | *nclasses = policydb.p_classes.nprim; | |
2030 | *classes = kcalloc(*nclasses, sizeof(*classes), GFP_ATOMIC); | |
2031 | if (!*classes) | |
2032 | goto out; | |
2033 | ||
2034 | rc = hashtab_map(policydb.p_classes.table, get_classes_callback, | |
2035 | *classes); | |
2036 | if (rc < 0) { | |
2037 | int i; | |
2038 | for (i = 0; i < *nclasses; i++) | |
2039 | kfree((*classes)[i]); | |
2040 | kfree(*classes); | |
2041 | } | |
2042 | ||
2043 | out: | |
2044 | POLICY_RDUNLOCK; | |
2045 | return rc; | |
2046 | } | |
2047 | ||
2048 | static int get_permissions_callback(void *k, void *d, void *args) | |
2049 | { | |
2050 | struct perm_datum *datum = d; | |
2051 | char *name = k, **perms = args; | |
2052 | int value = datum->value - 1; | |
2053 | ||
2054 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
2055 | if (!perms[value]) | |
2056 | return -ENOMEM; | |
2057 | ||
2058 | return 0; | |
2059 | } | |
2060 | ||
2061 | int security_get_permissions(char *class, char ***perms, int *nperms) | |
2062 | { | |
2063 | int rc = -ENOMEM, i; | |
2064 | struct class_datum *match; | |
2065 | ||
2066 | POLICY_RDLOCK; | |
2067 | ||
2068 | match = hashtab_search(policydb.p_classes.table, class); | |
2069 | if (!match) { | |
2070 | printk(KERN_ERR "%s: unrecognized class %s\n", | |
2071 | __FUNCTION__, class); | |
2072 | rc = -EINVAL; | |
2073 | goto out; | |
2074 | } | |
2075 | ||
2076 | *nperms = match->permissions.nprim; | |
2077 | *perms = kcalloc(*nperms, sizeof(*perms), GFP_ATOMIC); | |
2078 | if (!*perms) | |
2079 | goto out; | |
2080 | ||
2081 | if (match->comdatum) { | |
2082 | rc = hashtab_map(match->comdatum->permissions.table, | |
2083 | get_permissions_callback, *perms); | |
2084 | if (rc < 0) | |
2085 | goto err; | |
2086 | } | |
2087 | ||
2088 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
2089 | *perms); | |
2090 | if (rc < 0) | |
2091 | goto err; | |
2092 | ||
2093 | out: | |
2094 | POLICY_RDUNLOCK; | |
2095 | return rc; | |
2096 | ||
2097 | err: | |
2098 | POLICY_RDUNLOCK; | |
2099 | for (i = 0; i < *nperms; i++) | |
2100 | kfree((*perms)[i]); | |
2101 | kfree(*perms); | |
2102 | return rc; | |
2103 | } | |
2104 | ||
376bd9cb DG |
2105 | struct selinux_audit_rule { |
2106 | u32 au_seqno; | |
2107 | struct context au_ctxt; | |
2108 | }; | |
2109 | ||
2110 | void selinux_audit_rule_free(struct selinux_audit_rule *rule) | |
2111 | { | |
2112 | if (rule) { | |
2113 | context_destroy(&rule->au_ctxt); | |
2114 | kfree(rule); | |
2115 | } | |
2116 | } | |
2117 | ||
2118 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, | |
2119 | struct selinux_audit_rule **rule) | |
2120 | { | |
2121 | struct selinux_audit_rule *tmprule; | |
2122 | struct role_datum *roledatum; | |
2123 | struct type_datum *typedatum; | |
2124 | struct user_datum *userdatum; | |
2125 | int rc = 0; | |
2126 | ||
2127 | *rule = NULL; | |
2128 | ||
2129 | if (!ss_initialized) | |
2130 | return -ENOTSUPP; | |
2131 | ||
2132 | switch (field) { | |
3a6b9f85 DG |
2133 | case AUDIT_SUBJ_USER: |
2134 | case AUDIT_SUBJ_ROLE: | |
2135 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
2136 | case AUDIT_OBJ_USER: |
2137 | case AUDIT_OBJ_ROLE: | |
2138 | case AUDIT_OBJ_TYPE: | |
376bd9cb DG |
2139 | /* only 'equals' and 'not equals' fit user, role, and type */ |
2140 | if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL) | |
2141 | return -EINVAL; | |
2142 | break; | |
3a6b9f85 DG |
2143 | case AUDIT_SUBJ_SEN: |
2144 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2145 | case AUDIT_OBJ_LEV_LOW: |
2146 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2147 | /* we do not allow a range, indicated by the presense of '-' */ |
2148 | if (strchr(rulestr, '-')) | |
2149 | return -EINVAL; | |
2150 | break; | |
2151 | default: | |
2152 | /* only the above fields are valid */ | |
2153 | return -EINVAL; | |
2154 | } | |
2155 | ||
2156 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
2157 | if (!tmprule) | |
2158 | return -ENOMEM; | |
2159 | ||
2160 | context_init(&tmprule->au_ctxt); | |
2161 | ||
2162 | POLICY_RDLOCK; | |
2163 | ||
2164 | tmprule->au_seqno = latest_granting; | |
2165 | ||
2166 | switch (field) { | |
3a6b9f85 | 2167 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2168 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2169 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
2170 | if (!userdatum) | |
2171 | rc = -EINVAL; | |
2172 | else | |
2173 | tmprule->au_ctxt.user = userdatum->value; | |
2174 | break; | |
3a6b9f85 | 2175 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2176 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2177 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
2178 | if (!roledatum) | |
2179 | rc = -EINVAL; | |
2180 | else | |
2181 | tmprule->au_ctxt.role = roledatum->value; | |
2182 | break; | |
3a6b9f85 | 2183 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2184 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2185 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
2186 | if (!typedatum) | |
2187 | rc = -EINVAL; | |
2188 | else | |
2189 | tmprule->au_ctxt.type = typedatum->value; | |
2190 | break; | |
3a6b9f85 DG |
2191 | case AUDIT_SUBJ_SEN: |
2192 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2193 | case AUDIT_OBJ_LEV_LOW: |
2194 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2195 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
2196 | break; | |
2197 | } | |
2198 | ||
2199 | POLICY_RDUNLOCK; | |
2200 | ||
2201 | if (rc) { | |
2202 | selinux_audit_rule_free(tmprule); | |
2203 | tmprule = NULL; | |
2204 | } | |
2205 | ||
2206 | *rule = tmprule; | |
2207 | ||
2208 | return rc; | |
2209 | } | |
2210 | ||
9a2f44f0 | 2211 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, |
376bd9cb DG |
2212 | struct selinux_audit_rule *rule, |
2213 | struct audit_context *actx) | |
2214 | { | |
2215 | struct context *ctxt; | |
2216 | struct mls_level *level; | |
2217 | int match = 0; | |
2218 | ||
2219 | if (!rule) { | |
2220 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2221 | "selinux_audit_rule_match: missing rule\n"); | |
2222 | return -ENOENT; | |
2223 | } | |
2224 | ||
2225 | POLICY_RDLOCK; | |
2226 | ||
2227 | if (rule->au_seqno < latest_granting) { | |
2228 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2229 | "selinux_audit_rule_match: stale rule\n"); | |
2230 | match = -ESTALE; | |
2231 | goto out; | |
2232 | } | |
2233 | ||
9a2f44f0 | 2234 | ctxt = sidtab_search(&sidtab, sid); |
376bd9cb DG |
2235 | if (!ctxt) { |
2236 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2237 | "selinux_audit_rule_match: unrecognized SID %d\n", | |
9a2f44f0 | 2238 | sid); |
376bd9cb DG |
2239 | match = -ENOENT; |
2240 | goto out; | |
2241 | } | |
2242 | ||
2243 | /* a field/op pair that is not caught here will simply fall through | |
2244 | without a match */ | |
2245 | switch (field) { | |
3a6b9f85 | 2246 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2247 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2248 | switch (op) { |
2249 | case AUDIT_EQUAL: | |
2250 | match = (ctxt->user == rule->au_ctxt.user); | |
2251 | break; | |
2252 | case AUDIT_NOT_EQUAL: | |
2253 | match = (ctxt->user != rule->au_ctxt.user); | |
2254 | break; | |
2255 | } | |
2256 | break; | |
3a6b9f85 | 2257 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2258 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2259 | switch (op) { |
2260 | case AUDIT_EQUAL: | |
2261 | match = (ctxt->role == rule->au_ctxt.role); | |
2262 | break; | |
2263 | case AUDIT_NOT_EQUAL: | |
2264 | match = (ctxt->role != rule->au_ctxt.role); | |
2265 | break; | |
2266 | } | |
2267 | break; | |
3a6b9f85 | 2268 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2269 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2270 | switch (op) { |
2271 | case AUDIT_EQUAL: | |
2272 | match = (ctxt->type == rule->au_ctxt.type); | |
2273 | break; | |
2274 | case AUDIT_NOT_EQUAL: | |
2275 | match = (ctxt->type != rule->au_ctxt.type); | |
2276 | break; | |
2277 | } | |
2278 | break; | |
3a6b9f85 DG |
2279 | case AUDIT_SUBJ_SEN: |
2280 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2281 | case AUDIT_OBJ_LEV_LOW: |
2282 | case AUDIT_OBJ_LEV_HIGH: | |
2283 | level = ((field == AUDIT_SUBJ_SEN || | |
2284 | field == AUDIT_OBJ_LEV_LOW) ? | |
376bd9cb DG |
2285 | &ctxt->range.level[0] : &ctxt->range.level[1]); |
2286 | switch (op) { | |
2287 | case AUDIT_EQUAL: | |
2288 | match = mls_level_eq(&rule->au_ctxt.range.level[0], | |
2289 | level); | |
2290 | break; | |
2291 | case AUDIT_NOT_EQUAL: | |
2292 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2293 | level); | |
2294 | break; | |
2295 | case AUDIT_LESS_THAN: | |
2296 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], | |
2297 | level) && | |
2298 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2299 | level)); | |
2300 | break; | |
2301 | case AUDIT_LESS_THAN_OR_EQUAL: | |
2302 | match = mls_level_dom(&rule->au_ctxt.range.level[0], | |
2303 | level); | |
2304 | break; | |
2305 | case AUDIT_GREATER_THAN: | |
2306 | match = (mls_level_dom(level, | |
2307 | &rule->au_ctxt.range.level[0]) && | |
2308 | !mls_level_eq(level, | |
2309 | &rule->au_ctxt.range.level[0])); | |
2310 | break; | |
2311 | case AUDIT_GREATER_THAN_OR_EQUAL: | |
2312 | match = mls_level_dom(level, | |
2313 | &rule->au_ctxt.range.level[0]); | |
2314 | break; | |
2315 | } | |
2316 | } | |
2317 | ||
2318 | out: | |
2319 | POLICY_RDUNLOCK; | |
2320 | return match; | |
2321 | } | |
2322 | ||
2323 | static int (*aurule_callback)(void) = NULL; | |
2324 | ||
2325 | static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid, | |
2326 | u16 class, u32 perms, u32 *retained) | |
2327 | { | |
2328 | int err = 0; | |
2329 | ||
2330 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
2331 | err = aurule_callback(); | |
2332 | return err; | |
2333 | } | |
2334 | ||
2335 | static int __init aurule_init(void) | |
2336 | { | |
2337 | int err; | |
2338 | ||
2339 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET, | |
2340 | SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0); | |
2341 | if (err) | |
2342 | panic("avc_add_callback() failed, error %d\n", err); | |
2343 | ||
2344 | return err; | |
2345 | } | |
2346 | __initcall(aurule_init); | |
2347 | ||
2348 | void selinux_audit_set_callback(int (*callback)(void)) | |
2349 | { | |
2350 | aurule_callback = callback; | |
2351 | } | |
7420ed23 VY |
2352 | |
2353 | #ifdef CONFIG_NETLABEL | |
2354 | /* | |
5778eabd | 2355 | * NetLabel cache structure |
7420ed23 | 2356 | */ |
5778eabd | 2357 | #define NETLBL_CACHE(x) ((struct selinux_netlbl_cache *)(x)) |
7420ed23 VY |
2358 | #define NETLBL_CACHE_T_NONE 0 |
2359 | #define NETLBL_CACHE_T_SID 1 | |
2360 | #define NETLBL_CACHE_T_MLS 2 | |
5778eabd | 2361 | struct selinux_netlbl_cache { |
7420ed23 VY |
2362 | u32 type; |
2363 | union { | |
2364 | u32 sid; | |
2365 | struct mls_range mls_label; | |
2366 | } data; | |
2367 | }; | |
2368 | ||
2369 | /** | |
5778eabd | 2370 | * security_netlbl_cache_free - Free the NetLabel cached data |
7420ed23 VY |
2371 | * @data: the data to free |
2372 | * | |
2373 | * Description: | |
2374 | * This function is intended to be used as the free() callback inside the | |
2375 | * netlbl_lsm_cache structure. | |
2376 | * | |
2377 | */ | |
5778eabd | 2378 | static void security_netlbl_cache_free(const void *data) |
7420ed23 | 2379 | { |
5778eabd | 2380 | struct selinux_netlbl_cache *cache; |
ffb733c6 | 2381 | |
2382 | if (data == NULL) | |
2383 | return; | |
2384 | ||
2385 | cache = NETLBL_CACHE(data); | |
7420ed23 VY |
2386 | switch (cache->type) { |
2387 | case NETLBL_CACHE_T_MLS: | |
2388 | ebitmap_destroy(&cache->data.mls_label.level[0].cat); | |
2389 | break; | |
2390 | } | |
2391 | kfree(data); | |
2392 | } | |
2393 | ||
2394 | /** | |
5778eabd PM |
2395 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
2396 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
2397 | * @ctx: the SELinux context |
2398 | * | |
2399 | * Description: | |
2400 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
2401 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
2402 | * already been initialized. | |
7420ed23 VY |
2403 | * |
2404 | */ | |
5778eabd PM |
2405 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
2406 | struct context *ctx) | |
7420ed23 | 2407 | { |
5778eabd | 2408 | struct selinux_netlbl_cache *cache = NULL; |
7420ed23 | 2409 | |
5778eabd PM |
2410 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
2411 | if (secattr->cache == NULL) | |
2412 | return; | |
7420ed23 VY |
2413 | |
2414 | cache = kzalloc(sizeof(*cache), GFP_ATOMIC); | |
2415 | if (cache == NULL) | |
5778eabd | 2416 | return; |
7420ed23 VY |
2417 | |
2418 | cache->type = NETLBL_CACHE_T_MLS; | |
2419 | if (ebitmap_cpy(&cache->data.mls_label.level[0].cat, | |
2420 | &ctx->range.level[0].cat) != 0) | |
5778eabd | 2421 | return; |
7420ed23 VY |
2422 | cache->data.mls_label.level[1].cat.highbit = |
2423 | cache->data.mls_label.level[0].cat.highbit; | |
2424 | cache->data.mls_label.level[1].cat.node = | |
2425 | cache->data.mls_label.level[0].cat.node; | |
2426 | cache->data.mls_label.level[0].sens = ctx->range.level[0].sens; | |
2427 | cache->data.mls_label.level[1].sens = ctx->range.level[0].sens; | |
2428 | ||
5778eabd PM |
2429 | secattr->cache->free = security_netlbl_cache_free; |
2430 | secattr->cache->data = (void *)cache; | |
2431 | secattr->flags |= NETLBL_SECATTR_CACHE; | |
7420ed23 VY |
2432 | } |
2433 | ||
2434 | /** | |
5778eabd | 2435 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 VY |
2436 | * @secattr: the NetLabel packet security attributes |
2437 | * @base_sid: the SELinux SID to use as a context for MLS only attributes | |
2438 | * @sid: the SELinux SID | |
2439 | * | |
2440 | * Description: | |
5778eabd | 2441 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 2442 | * SELinux SID. If the @secattr field does not contain a full SELinux |
5778eabd PM |
2443 | * SID/context then use the context in @base_sid as the foundation. If |
2444 | * possibile the 'cache' field of @secattr is set and the CACHE flag is set; | |
2445 | * this is to allow the @secattr to be used by NetLabel to cache the secattr to | |
2446 | * SID conversion for future lookups. Returns zero on success, negative | |
2447 | * values on failure. | |
7420ed23 VY |
2448 | * |
2449 | */ | |
5778eabd PM |
2450 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
2451 | u32 base_sid, | |
2452 | u32 *sid) | |
7420ed23 VY |
2453 | { |
2454 | int rc = -EIDRM; | |
2455 | struct context *ctx; | |
2456 | struct context ctx_new; | |
5778eabd PM |
2457 | struct selinux_netlbl_cache *cache; |
2458 | ||
2459 | if (!ss_initialized) { | |
2460 | *sid = SECSID_NULL; | |
2461 | return 0; | |
2462 | } | |
7420ed23 VY |
2463 | |
2464 | POLICY_RDLOCK; | |
2465 | ||
701a90ba | 2466 | if (secattr->flags & NETLBL_SECATTR_CACHE) { |
ffb733c6 | 2467 | cache = NETLBL_CACHE(secattr->cache->data); |
7420ed23 VY |
2468 | switch (cache->type) { |
2469 | case NETLBL_CACHE_T_SID: | |
2470 | *sid = cache->data.sid; | |
2471 | rc = 0; | |
2472 | break; | |
2473 | case NETLBL_CACHE_T_MLS: | |
2474 | ctx = sidtab_search(&sidtab, base_sid); | |
2475 | if (ctx == NULL) | |
2476 | goto netlbl_secattr_to_sid_return; | |
2477 | ||
2478 | ctx_new.user = ctx->user; | |
2479 | ctx_new.role = ctx->role; | |
2480 | ctx_new.type = ctx->type; | |
2481 | ctx_new.range.level[0].sens = | |
2482 | cache->data.mls_label.level[0].sens; | |
2483 | ctx_new.range.level[0].cat.highbit = | |
2484 | cache->data.mls_label.level[0].cat.highbit; | |
2485 | ctx_new.range.level[0].cat.node = | |
2486 | cache->data.mls_label.level[0].cat.node; | |
2487 | ctx_new.range.level[1].sens = | |
2488 | cache->data.mls_label.level[1].sens; | |
2489 | ctx_new.range.level[1].cat.highbit = | |
2490 | cache->data.mls_label.level[1].cat.highbit; | |
2491 | ctx_new.range.level[1].cat.node = | |
2492 | cache->data.mls_label.level[1].cat.node; | |
2493 | ||
2494 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
2495 | break; | |
2496 | default: | |
2497 | goto netlbl_secattr_to_sid_return; | |
2498 | } | |
701a90ba | 2499 | } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
7420ed23 VY |
2500 | ctx = sidtab_search(&sidtab, base_sid); |
2501 | if (ctx == NULL) | |
2502 | goto netlbl_secattr_to_sid_return; | |
2503 | ||
2504 | ctx_new.user = ctx->user; | |
2505 | ctx_new.role = ctx->role; | |
2506 | ctx_new.type = ctx->type; | |
02752760 | 2507 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 2508 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
02752760 PM |
2509 | if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat, |
2510 | secattr->mls_cat) != 0) | |
7420ed23 VY |
2511 | goto netlbl_secattr_to_sid_return; |
2512 | ctx_new.range.level[1].cat.highbit = | |
2513 | ctx_new.range.level[0].cat.highbit; | |
2514 | ctx_new.range.level[1].cat.node = | |
2515 | ctx_new.range.level[0].cat.node; | |
2516 | } else { | |
2517 | ebitmap_init(&ctx_new.range.level[0].cat); | |
2518 | ebitmap_init(&ctx_new.range.level[1].cat); | |
2519 | } | |
2520 | if (mls_context_isvalid(&policydb, &ctx_new) != 1) | |
2521 | goto netlbl_secattr_to_sid_return_cleanup; | |
2522 | ||
2523 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
2524 | if (rc != 0) | |
2525 | goto netlbl_secattr_to_sid_return_cleanup; | |
2526 | ||
5778eabd PM |
2527 | security_netlbl_cache_add(secattr, &ctx_new); |
2528 | ||
7420ed23 VY |
2529 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
2530 | } else { | |
388b2405 | 2531 | *sid = SECSID_NULL; |
7420ed23 VY |
2532 | rc = 0; |
2533 | } | |
2534 | ||
2535 | netlbl_secattr_to_sid_return: | |
2536 | POLICY_RDUNLOCK; | |
2537 | return rc; | |
2538 | netlbl_secattr_to_sid_return_cleanup: | |
2539 | ebitmap_destroy(&ctx_new.range.level[0].cat); | |
2540 | goto netlbl_secattr_to_sid_return; | |
2541 | } | |
2542 | ||
2543 | /** | |
5778eabd PM |
2544 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
2545 | * @sid: the SELinux SID | |
2546 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
2547 | * |
2548 | * Description: | |
5778eabd PM |
2549 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
2550 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
2551 | * |
2552 | */ | |
5778eabd | 2553 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 VY |
2554 | { |
2555 | int rc = -ENOENT; | |
7420ed23 VY |
2556 | struct context *ctx; |
2557 | ||
5778eabd PM |
2558 | netlbl_secattr_init(secattr); |
2559 | ||
7420ed23 VY |
2560 | if (!ss_initialized) |
2561 | return 0; | |
2562 | ||
2563 | POLICY_RDLOCK; | |
7420ed23 VY |
2564 | ctx = sidtab_search(&sidtab, sid); |
2565 | if (ctx == NULL) | |
5778eabd PM |
2566 | goto netlbl_sid_to_secattr_failure; |
2567 | secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], | |
2568 | GFP_ATOMIC); | |
2569 | secattr->flags |= NETLBL_SECATTR_DOMAIN; | |
2570 | mls_export_netlbl_lvl(ctx, secattr); | |
2571 | rc = mls_export_netlbl_cat(ctx, secattr); | |
bf0edf39 | 2572 | if (rc != 0) |
5778eabd | 2573 | goto netlbl_sid_to_secattr_failure; |
7420ed23 | 2574 | POLICY_RDUNLOCK; |
99f59ed0 | 2575 | |
5778eabd | 2576 | return 0; |
f8687afe | 2577 | |
5778eabd PM |
2578 | netlbl_sid_to_secattr_failure: |
2579 | POLICY_RDUNLOCK; | |
2580 | netlbl_secattr_destroy(secattr); | |
f8687afe PM |
2581 | return rc; |
2582 | } | |
7420ed23 | 2583 | #endif /* CONFIG_NETLABEL */ |