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 VY |
42 | #include <net/sock.h> |
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 VY |
55 | #include "objsec.h" |
56 | #include "selinux_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 | ||
b94c7e67 CS |
63 | /* |
64 | * This is declared in avc.c | |
65 | */ | |
66 | extern const struct selinux_class_perm selinux_class_perm; | |
67 | ||
1da177e4 LT |
68 | static DEFINE_RWLOCK(policy_rwlock); |
69 | #define POLICY_RDLOCK read_lock(&policy_rwlock) | |
70 | #define POLICY_WRLOCK write_lock_irq(&policy_rwlock) | |
71 | #define POLICY_RDUNLOCK read_unlock(&policy_rwlock) | |
72 | #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock) | |
73 | ||
bb003079 IM |
74 | static DEFINE_MUTEX(load_mutex); |
75 | #define LOAD_LOCK mutex_lock(&load_mutex) | |
76 | #define LOAD_UNLOCK mutex_unlock(&load_mutex) | |
1da177e4 LT |
77 | |
78 | static struct sidtab sidtab; | |
79 | struct policydb policydb; | |
80 | int ss_initialized = 0; | |
81 | ||
82 | /* | |
83 | * The largest sequence number that has been used when | |
84 | * providing an access decision to the access vector cache. | |
85 | * The sequence number only changes when a policy change | |
86 | * occurs. | |
87 | */ | |
88 | static u32 latest_granting = 0; | |
89 | ||
90 | /* Forward declaration. */ | |
91 | static int context_struct_to_string(struct context *context, char **scontext, | |
92 | u32 *scontext_len); | |
93 | ||
94 | /* | |
95 | * Return the boolean value of a constraint expression | |
96 | * when it is applied to the specified source and target | |
97 | * security contexts. | |
98 | * | |
99 | * xcontext is a special beast... It is used by the validatetrans rules | |
100 | * only. For these rules, scontext is the context before the transition, | |
101 | * tcontext is the context after the transition, and xcontext is the context | |
102 | * of the process performing the transition. All other callers of | |
103 | * constraint_expr_eval should pass in NULL for xcontext. | |
104 | */ | |
105 | static int constraint_expr_eval(struct context *scontext, | |
106 | struct context *tcontext, | |
107 | struct context *xcontext, | |
108 | struct constraint_expr *cexpr) | |
109 | { | |
110 | u32 val1, val2; | |
111 | struct context *c; | |
112 | struct role_datum *r1, *r2; | |
113 | struct mls_level *l1, *l2; | |
114 | struct constraint_expr *e; | |
115 | int s[CEXPR_MAXDEPTH]; | |
116 | int sp = -1; | |
117 | ||
118 | for (e = cexpr; e; e = e->next) { | |
119 | switch (e->expr_type) { | |
120 | case CEXPR_NOT: | |
121 | BUG_ON(sp < 0); | |
122 | s[sp] = !s[sp]; | |
123 | break; | |
124 | case CEXPR_AND: | |
125 | BUG_ON(sp < 1); | |
126 | sp--; | |
127 | s[sp] &= s[sp+1]; | |
128 | break; | |
129 | case CEXPR_OR: | |
130 | BUG_ON(sp < 1); | |
131 | sp--; | |
132 | s[sp] |= s[sp+1]; | |
133 | break; | |
134 | case CEXPR_ATTR: | |
135 | if (sp == (CEXPR_MAXDEPTH-1)) | |
136 | return 0; | |
137 | switch (e->attr) { | |
138 | case CEXPR_USER: | |
139 | val1 = scontext->user; | |
140 | val2 = tcontext->user; | |
141 | break; | |
142 | case CEXPR_TYPE: | |
143 | val1 = scontext->type; | |
144 | val2 = tcontext->type; | |
145 | break; | |
146 | case CEXPR_ROLE: | |
147 | val1 = scontext->role; | |
148 | val2 = tcontext->role; | |
149 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
150 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
151 | switch (e->op) { | |
152 | case CEXPR_DOM: | |
153 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
154 | val2 - 1); | |
155 | continue; | |
156 | case CEXPR_DOMBY: | |
157 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
158 | val1 - 1); | |
159 | continue; | |
160 | case CEXPR_INCOMP: | |
161 | s[++sp] = ( !ebitmap_get_bit(&r1->dominates, | |
162 | val2 - 1) && | |
163 | !ebitmap_get_bit(&r2->dominates, | |
164 | val1 - 1) ); | |
165 | continue; | |
166 | default: | |
167 | break; | |
168 | } | |
169 | break; | |
170 | case CEXPR_L1L2: | |
171 | l1 = &(scontext->range.level[0]); | |
172 | l2 = &(tcontext->range.level[0]); | |
173 | goto mls_ops; | |
174 | case CEXPR_L1H2: | |
175 | l1 = &(scontext->range.level[0]); | |
176 | l2 = &(tcontext->range.level[1]); | |
177 | goto mls_ops; | |
178 | case CEXPR_H1L2: | |
179 | l1 = &(scontext->range.level[1]); | |
180 | l2 = &(tcontext->range.level[0]); | |
181 | goto mls_ops; | |
182 | case CEXPR_H1H2: | |
183 | l1 = &(scontext->range.level[1]); | |
184 | l2 = &(tcontext->range.level[1]); | |
185 | goto mls_ops; | |
186 | case CEXPR_L1H1: | |
187 | l1 = &(scontext->range.level[0]); | |
188 | l2 = &(scontext->range.level[1]); | |
189 | goto mls_ops; | |
190 | case CEXPR_L2H2: | |
191 | l1 = &(tcontext->range.level[0]); | |
192 | l2 = &(tcontext->range.level[1]); | |
193 | goto mls_ops; | |
194 | mls_ops: | |
195 | switch (e->op) { | |
196 | case CEXPR_EQ: | |
197 | s[++sp] = mls_level_eq(l1, l2); | |
198 | continue; | |
199 | case CEXPR_NEQ: | |
200 | s[++sp] = !mls_level_eq(l1, l2); | |
201 | continue; | |
202 | case CEXPR_DOM: | |
203 | s[++sp] = mls_level_dom(l1, l2); | |
204 | continue; | |
205 | case CEXPR_DOMBY: | |
206 | s[++sp] = mls_level_dom(l2, l1); | |
207 | continue; | |
208 | case CEXPR_INCOMP: | |
209 | s[++sp] = mls_level_incomp(l2, l1); | |
210 | continue; | |
211 | default: | |
212 | BUG(); | |
213 | return 0; | |
214 | } | |
215 | break; | |
216 | default: | |
217 | BUG(); | |
218 | return 0; | |
219 | } | |
220 | ||
221 | switch (e->op) { | |
222 | case CEXPR_EQ: | |
223 | s[++sp] = (val1 == val2); | |
224 | break; | |
225 | case CEXPR_NEQ: | |
226 | s[++sp] = (val1 != val2); | |
227 | break; | |
228 | default: | |
229 | BUG(); | |
230 | return 0; | |
231 | } | |
232 | break; | |
233 | case CEXPR_NAMES: | |
234 | if (sp == (CEXPR_MAXDEPTH-1)) | |
235 | return 0; | |
236 | c = scontext; | |
237 | if (e->attr & CEXPR_TARGET) | |
238 | c = tcontext; | |
239 | else if (e->attr & CEXPR_XTARGET) { | |
240 | c = xcontext; | |
241 | if (!c) { | |
242 | BUG(); | |
243 | return 0; | |
244 | } | |
245 | } | |
246 | if (e->attr & CEXPR_USER) | |
247 | val1 = c->user; | |
248 | else if (e->attr & CEXPR_ROLE) | |
249 | val1 = c->role; | |
250 | else if (e->attr & CEXPR_TYPE) | |
251 | val1 = c->type; | |
252 | else { | |
253 | BUG(); | |
254 | return 0; | |
255 | } | |
256 | ||
257 | switch (e->op) { | |
258 | case CEXPR_EQ: | |
259 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
260 | break; | |
261 | case CEXPR_NEQ: | |
262 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
263 | break; | |
264 | default: | |
265 | BUG(); | |
266 | return 0; | |
267 | } | |
268 | break; | |
269 | default: | |
270 | BUG(); | |
271 | return 0; | |
272 | } | |
273 | } | |
274 | ||
275 | BUG_ON(sp != 0); | |
276 | return s[0]; | |
277 | } | |
278 | ||
279 | /* | |
280 | * Compute access vectors based on a context structure pair for | |
281 | * the permissions in a particular class. | |
282 | */ | |
283 | static int context_struct_compute_av(struct context *scontext, | |
284 | struct context *tcontext, | |
285 | u16 tclass, | |
286 | u32 requested, | |
287 | struct av_decision *avd) | |
288 | { | |
289 | struct constraint_node *constraint; | |
290 | struct role_allow *ra; | |
291 | struct avtab_key avkey; | |
782ebb99 | 292 | struct avtab_node *node; |
1da177e4 | 293 | struct class_datum *tclass_datum; |
782ebb99 SS |
294 | struct ebitmap *sattr, *tattr; |
295 | struct ebitmap_node *snode, *tnode; | |
296 | unsigned int i, j; | |
1da177e4 LT |
297 | |
298 | /* | |
299 | * Remap extended Netlink classes for old policy versions. | |
300 | * Do this here rather than socket_type_to_security_class() | |
301 | * in case a newer policy version is loaded, allowing sockets | |
302 | * to remain in the correct class. | |
303 | */ | |
304 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
305 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
306 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
307 | tclass = SECCLASS_NETLINK_SOCKET; | |
308 | ||
309 | if (!tclass || tclass > policydb.p_classes.nprim) { | |
310 | printk(KERN_ERR "security_compute_av: unrecognized class %d\n", | |
311 | tclass); | |
312 | return -EINVAL; | |
313 | } | |
314 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
315 | ||
316 | /* | |
317 | * Initialize the access vectors to the default values. | |
318 | */ | |
319 | avd->allowed = 0; | |
320 | avd->decided = 0xffffffff; | |
321 | avd->auditallow = 0; | |
322 | avd->auditdeny = 0xffffffff; | |
323 | avd->seqno = latest_granting; | |
324 | ||
325 | /* | |
326 | * If a specific type enforcement rule was defined for | |
327 | * this permission check, then use it. | |
328 | */ | |
1da177e4 | 329 | avkey.target_class = tclass; |
782ebb99 SS |
330 | avkey.specified = AVTAB_AV; |
331 | sattr = &policydb.type_attr_map[scontext->type - 1]; | |
332 | tattr = &policydb.type_attr_map[tcontext->type - 1]; | |
333 | ebitmap_for_each_bit(sattr, snode, i) { | |
334 | if (!ebitmap_node_get_bit(snode, i)) | |
335 | continue; | |
336 | ebitmap_for_each_bit(tattr, tnode, j) { | |
337 | if (!ebitmap_node_get_bit(tnode, j)) | |
338 | continue; | |
339 | avkey.source_type = i + 1; | |
340 | avkey.target_type = j + 1; | |
341 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
342 | node != NULL; | |
343 | node = avtab_search_node_next(node, avkey.specified)) { | |
344 | if (node->key.specified == AVTAB_ALLOWED) | |
345 | avd->allowed |= node->datum.data; | |
346 | else if (node->key.specified == AVTAB_AUDITALLOW) | |
347 | avd->auditallow |= node->datum.data; | |
348 | else if (node->key.specified == AVTAB_AUDITDENY) | |
349 | avd->auditdeny &= node->datum.data; | |
350 | } | |
1da177e4 | 351 | |
782ebb99 SS |
352 | /* Check conditional av table for additional permissions */ |
353 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); | |
354 | ||
355 | } | |
356 | } | |
1da177e4 LT |
357 | |
358 | /* | |
359 | * Remove any permissions prohibited by a constraint (this includes | |
360 | * the MLS policy). | |
361 | */ | |
362 | constraint = tclass_datum->constraints; | |
363 | while (constraint) { | |
364 | if ((constraint->permissions & (avd->allowed)) && | |
365 | !constraint_expr_eval(scontext, tcontext, NULL, | |
366 | constraint->expr)) { | |
367 | avd->allowed = (avd->allowed) & ~(constraint->permissions); | |
368 | } | |
369 | constraint = constraint->next; | |
370 | } | |
371 | ||
372 | /* | |
373 | * If checking process transition permission and the | |
374 | * role is changing, then check the (current_role, new_role) | |
375 | * pair. | |
376 | */ | |
377 | if (tclass == SECCLASS_PROCESS && | |
378 | (avd->allowed & (PROCESS__TRANSITION | PROCESS__DYNTRANSITION)) && | |
379 | scontext->role != tcontext->role) { | |
380 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
381 | if (scontext->role == ra->role && | |
382 | tcontext->role == ra->new_role) | |
383 | break; | |
384 | } | |
385 | if (!ra) | |
386 | avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION | | |
387 | PROCESS__DYNTRANSITION); | |
388 | } | |
389 | ||
390 | return 0; | |
391 | } | |
392 | ||
393 | static int security_validtrans_handle_fail(struct context *ocontext, | |
394 | struct context *ncontext, | |
395 | struct context *tcontext, | |
396 | u16 tclass) | |
397 | { | |
398 | char *o = NULL, *n = NULL, *t = NULL; | |
399 | u32 olen, nlen, tlen; | |
400 | ||
401 | if (context_struct_to_string(ocontext, &o, &olen) < 0) | |
402 | goto out; | |
403 | if (context_struct_to_string(ncontext, &n, &nlen) < 0) | |
404 | goto out; | |
405 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
406 | goto out; | |
9ad9ad38 | 407 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
408 | "security_validate_transition: denied for" |
409 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", | |
410 | o, n, t, policydb.p_class_val_to_name[tclass-1]); | |
411 | out: | |
412 | kfree(o); | |
413 | kfree(n); | |
414 | kfree(t); | |
415 | ||
416 | if (!selinux_enforcing) | |
417 | return 0; | |
418 | return -EPERM; | |
419 | } | |
420 | ||
421 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
422 | u16 tclass) | |
423 | { | |
424 | struct context *ocontext; | |
425 | struct context *ncontext; | |
426 | struct context *tcontext; | |
427 | struct class_datum *tclass_datum; | |
428 | struct constraint_node *constraint; | |
429 | int rc = 0; | |
430 | ||
431 | if (!ss_initialized) | |
432 | return 0; | |
433 | ||
434 | POLICY_RDLOCK; | |
435 | ||
436 | /* | |
437 | * Remap extended Netlink classes for old policy versions. | |
438 | * Do this here rather than socket_type_to_security_class() | |
439 | * in case a newer policy version is loaded, allowing sockets | |
440 | * to remain in the correct class. | |
441 | */ | |
442 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
443 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
444 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
445 | tclass = SECCLASS_NETLINK_SOCKET; | |
446 | ||
447 | if (!tclass || tclass > policydb.p_classes.nprim) { | |
448 | printk(KERN_ERR "security_validate_transition: " | |
449 | "unrecognized class %d\n", tclass); | |
450 | rc = -EINVAL; | |
451 | goto out; | |
452 | } | |
453 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
454 | ||
455 | ocontext = sidtab_search(&sidtab, oldsid); | |
456 | if (!ocontext) { | |
457 | printk(KERN_ERR "security_validate_transition: " | |
458 | " unrecognized SID %d\n", oldsid); | |
459 | rc = -EINVAL; | |
460 | goto out; | |
461 | } | |
462 | ||
463 | ncontext = sidtab_search(&sidtab, newsid); | |
464 | if (!ncontext) { | |
465 | printk(KERN_ERR "security_validate_transition: " | |
466 | " unrecognized SID %d\n", newsid); | |
467 | rc = -EINVAL; | |
468 | goto out; | |
469 | } | |
470 | ||
471 | tcontext = sidtab_search(&sidtab, tasksid); | |
472 | if (!tcontext) { | |
473 | printk(KERN_ERR "security_validate_transition: " | |
474 | " unrecognized SID %d\n", tasksid); | |
475 | rc = -EINVAL; | |
476 | goto out; | |
477 | } | |
478 | ||
479 | constraint = tclass_datum->validatetrans; | |
480 | while (constraint) { | |
481 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
482 | constraint->expr)) { | |
483 | rc = security_validtrans_handle_fail(ocontext, ncontext, | |
484 | tcontext, tclass); | |
485 | goto out; | |
486 | } | |
487 | constraint = constraint->next; | |
488 | } | |
489 | ||
490 | out: | |
491 | POLICY_RDUNLOCK; | |
492 | return rc; | |
493 | } | |
494 | ||
495 | /** | |
496 | * security_compute_av - Compute access vector decisions. | |
497 | * @ssid: source security identifier | |
498 | * @tsid: target security identifier | |
499 | * @tclass: target security class | |
500 | * @requested: requested permissions | |
501 | * @avd: access vector decisions | |
502 | * | |
503 | * Compute a set of access vector decisions based on the | |
504 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
505 | * Return -%EINVAL if any of the parameters are invalid or %0 | |
506 | * if the access vector decisions were computed successfully. | |
507 | */ | |
508 | int security_compute_av(u32 ssid, | |
509 | u32 tsid, | |
510 | u16 tclass, | |
511 | u32 requested, | |
512 | struct av_decision *avd) | |
513 | { | |
514 | struct context *scontext = NULL, *tcontext = NULL; | |
515 | int rc = 0; | |
516 | ||
517 | if (!ss_initialized) { | |
4c443d1b SS |
518 | avd->allowed = 0xffffffff; |
519 | avd->decided = 0xffffffff; | |
1da177e4 LT |
520 | avd->auditallow = 0; |
521 | avd->auditdeny = 0xffffffff; | |
522 | avd->seqno = latest_granting; | |
523 | return 0; | |
524 | } | |
525 | ||
526 | POLICY_RDLOCK; | |
527 | ||
528 | scontext = sidtab_search(&sidtab, ssid); | |
529 | if (!scontext) { | |
530 | printk(KERN_ERR "security_compute_av: unrecognized SID %d\n", | |
531 | ssid); | |
532 | rc = -EINVAL; | |
533 | goto out; | |
534 | } | |
535 | tcontext = sidtab_search(&sidtab, tsid); | |
536 | if (!tcontext) { | |
537 | printk(KERN_ERR "security_compute_av: unrecognized SID %d\n", | |
538 | tsid); | |
539 | rc = -EINVAL; | |
540 | goto out; | |
541 | } | |
542 | ||
543 | rc = context_struct_compute_av(scontext, tcontext, tclass, | |
544 | requested, avd); | |
545 | out: | |
546 | POLICY_RDUNLOCK; | |
547 | return rc; | |
548 | } | |
549 | ||
550 | /* | |
551 | * Write the security context string representation of | |
552 | * the context structure `context' into a dynamically | |
553 | * allocated string of the correct size. Set `*scontext' | |
554 | * to point to this string and set `*scontext_len' to | |
555 | * the length of the string. | |
556 | */ | |
557 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
558 | { | |
559 | char *scontextp; | |
560 | ||
561 | *scontext = NULL; | |
562 | *scontext_len = 0; | |
563 | ||
564 | /* Compute the size of the context. */ | |
565 | *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; | |
566 | *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; | |
567 | *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; | |
568 | *scontext_len += mls_compute_context_len(context); | |
569 | ||
570 | /* Allocate space for the context; caller must free this space. */ | |
571 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
572 | if (!scontextp) { | |
573 | return -ENOMEM; | |
574 | } | |
575 | *scontext = scontextp; | |
576 | ||
577 | /* | |
578 | * Copy the user name, role name and type name into the context. | |
579 | */ | |
580 | sprintf(scontextp, "%s:%s:%s", | |
581 | policydb.p_user_val_to_name[context->user - 1], | |
582 | policydb.p_role_val_to_name[context->role - 1], | |
583 | policydb.p_type_val_to_name[context->type - 1]); | |
584 | scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + | |
585 | 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + | |
586 | 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); | |
587 | ||
588 | mls_sid_to_context(context, &scontextp); | |
589 | ||
590 | *scontextp = 0; | |
591 | ||
592 | return 0; | |
593 | } | |
594 | ||
595 | #include "initial_sid_to_string.h" | |
596 | ||
597 | /** | |
598 | * security_sid_to_context - Obtain a context for a given SID. | |
599 | * @sid: security identifier, SID | |
600 | * @scontext: security context | |
601 | * @scontext_len: length in bytes | |
602 | * | |
603 | * Write the string representation of the context associated with @sid | |
604 | * into a dynamically allocated string of the correct size. Set @scontext | |
605 | * to point to this string and set @scontext_len to the length of the string. | |
606 | */ | |
607 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
608 | { | |
609 | struct context *context; | |
610 | int rc = 0; | |
611 | ||
612 | if (!ss_initialized) { | |
613 | if (sid <= SECINITSID_NUM) { | |
614 | char *scontextp; | |
615 | ||
616 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
617 | scontextp = kmalloc(*scontext_len,GFP_ATOMIC); | |
0cccca06 SH |
618 | if (!scontextp) { |
619 | rc = -ENOMEM; | |
620 | goto out; | |
621 | } | |
1da177e4 LT |
622 | strcpy(scontextp, initial_sid_to_string[sid]); |
623 | *scontext = scontextp; | |
624 | goto out; | |
625 | } | |
626 | printk(KERN_ERR "security_sid_to_context: called before initial " | |
627 | "load_policy on unknown SID %d\n", sid); | |
628 | rc = -EINVAL; | |
629 | goto out; | |
630 | } | |
631 | POLICY_RDLOCK; | |
632 | context = sidtab_search(&sidtab, sid); | |
633 | if (!context) { | |
634 | printk(KERN_ERR "security_sid_to_context: unrecognized SID " | |
635 | "%d\n", sid); | |
636 | rc = -EINVAL; | |
637 | goto out_unlock; | |
638 | } | |
639 | rc = context_struct_to_string(context, scontext, scontext_len); | |
640 | out_unlock: | |
641 | POLICY_RDUNLOCK; | |
642 | out: | |
643 | return rc; | |
644 | ||
645 | } | |
646 | ||
f5c1d5b2 | 647 | static int security_context_to_sid_core(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid) |
1da177e4 LT |
648 | { |
649 | char *scontext2; | |
650 | struct context context; | |
651 | struct role_datum *role; | |
652 | struct type_datum *typdatum; | |
653 | struct user_datum *usrdatum; | |
654 | char *scontextp, *p, oldc; | |
655 | int rc = 0; | |
656 | ||
657 | if (!ss_initialized) { | |
658 | int i; | |
659 | ||
660 | for (i = 1; i < SECINITSID_NUM; i++) { | |
661 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
662 | *sid = i; | |
663 | goto out; | |
664 | } | |
665 | } | |
666 | *sid = SECINITSID_KERNEL; | |
667 | goto out; | |
668 | } | |
669 | *sid = SECSID_NULL; | |
670 | ||
671 | /* Copy the string so that we can modify the copy as we parse it. | |
672 | The string should already by null terminated, but we append a | |
673 | null suffix to the copy to avoid problems with the existing | |
674 | attr package, which doesn't view the null terminator as part | |
675 | of the attribute value. */ | |
676 | scontext2 = kmalloc(scontext_len+1,GFP_KERNEL); | |
677 | if (!scontext2) { | |
678 | rc = -ENOMEM; | |
679 | goto out; | |
680 | } | |
681 | memcpy(scontext2, scontext, scontext_len); | |
682 | scontext2[scontext_len] = 0; | |
683 | ||
684 | context_init(&context); | |
685 | *sid = SECSID_NULL; | |
686 | ||
687 | POLICY_RDLOCK; | |
688 | ||
689 | /* Parse the security context. */ | |
690 | ||
691 | rc = -EINVAL; | |
692 | scontextp = (char *) scontext2; | |
693 | ||
694 | /* Extract the user. */ | |
695 | p = scontextp; | |
696 | while (*p && *p != ':') | |
697 | p++; | |
698 | ||
699 | if (*p == 0) | |
700 | goto out_unlock; | |
701 | ||
702 | *p++ = 0; | |
703 | ||
704 | usrdatum = hashtab_search(policydb.p_users.table, scontextp); | |
705 | if (!usrdatum) | |
706 | goto out_unlock; | |
707 | ||
708 | context.user = usrdatum->value; | |
709 | ||
710 | /* Extract role. */ | |
711 | scontextp = p; | |
712 | while (*p && *p != ':') | |
713 | p++; | |
714 | ||
715 | if (*p == 0) | |
716 | goto out_unlock; | |
717 | ||
718 | *p++ = 0; | |
719 | ||
720 | role = hashtab_search(policydb.p_roles.table, scontextp); | |
721 | if (!role) | |
722 | goto out_unlock; | |
723 | context.role = role->value; | |
724 | ||
725 | /* Extract type. */ | |
726 | scontextp = p; | |
727 | while (*p && *p != ':') | |
728 | p++; | |
729 | oldc = *p; | |
730 | *p++ = 0; | |
731 | ||
732 | typdatum = hashtab_search(policydb.p_types.table, scontextp); | |
733 | if (!typdatum) | |
734 | goto out_unlock; | |
735 | ||
736 | context.type = typdatum->value; | |
737 | ||
f5c1d5b2 | 738 | rc = mls_context_to_sid(oldc, &p, &context, &sidtab, def_sid); |
1da177e4 LT |
739 | if (rc) |
740 | goto out_unlock; | |
741 | ||
742 | if ((p - scontext2) < scontext_len) { | |
743 | rc = -EINVAL; | |
744 | goto out_unlock; | |
745 | } | |
746 | ||
747 | /* Check the validity of the new context. */ | |
748 | if (!policydb_context_isvalid(&policydb, &context)) { | |
749 | rc = -EINVAL; | |
750 | goto out_unlock; | |
751 | } | |
752 | /* Obtain the new sid. */ | |
753 | rc = sidtab_context_to_sid(&sidtab, &context, sid); | |
754 | out_unlock: | |
755 | POLICY_RDUNLOCK; | |
756 | context_destroy(&context); | |
757 | kfree(scontext2); | |
758 | out: | |
759 | return rc; | |
760 | } | |
761 | ||
f5c1d5b2 JM |
762 | /** |
763 | * security_context_to_sid - Obtain a SID for a given security context. | |
764 | * @scontext: security context | |
765 | * @scontext_len: length in bytes | |
766 | * @sid: security identifier, SID | |
767 | * | |
768 | * Obtains a SID associated with the security context that | |
769 | * has the string representation specified by @scontext. | |
770 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
771 | * memory is available, or 0 on success. | |
772 | */ | |
773 | int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid) | |
774 | { | |
775 | return security_context_to_sid_core(scontext, scontext_len, | |
776 | sid, SECSID_NULL); | |
777 | } | |
778 | ||
779 | /** | |
780 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
781 | * falling back to specified default if needed. | |
782 | * | |
783 | * @scontext: security context | |
784 | * @scontext_len: length in bytes | |
785 | * @sid: security identifier, SID | |
786 | * @def_sid: default SID to assign on errror | |
787 | * | |
788 | * Obtains a SID associated with the security context that | |
789 | * has the string representation specified by @scontext. | |
790 | * The default SID is passed to the MLS layer to be used to allow | |
791 | * kernel labeling of the MLS field if the MLS field is not present | |
792 | * (for upgrading to MLS without full relabel). | |
793 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
794 | * memory is available, or 0 on success. | |
795 | */ | |
796 | int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid) | |
797 | { | |
798 | return security_context_to_sid_core(scontext, scontext_len, | |
799 | sid, def_sid); | |
800 | } | |
801 | ||
1da177e4 LT |
802 | static int compute_sid_handle_invalid_context( |
803 | struct context *scontext, | |
804 | struct context *tcontext, | |
805 | u16 tclass, | |
806 | struct context *newcontext) | |
807 | { | |
808 | char *s = NULL, *t = NULL, *n = NULL; | |
809 | u32 slen, tlen, nlen; | |
810 | ||
811 | if (context_struct_to_string(scontext, &s, &slen) < 0) | |
812 | goto out; | |
813 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
814 | goto out; | |
815 | if (context_struct_to_string(newcontext, &n, &nlen) < 0) | |
816 | goto out; | |
9ad9ad38 | 817 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
818 | "security_compute_sid: invalid context %s" |
819 | " for scontext=%s" | |
820 | " tcontext=%s" | |
821 | " tclass=%s", | |
822 | n, s, t, policydb.p_class_val_to_name[tclass-1]); | |
823 | out: | |
824 | kfree(s); | |
825 | kfree(t); | |
826 | kfree(n); | |
827 | if (!selinux_enforcing) | |
828 | return 0; | |
829 | return -EACCES; | |
830 | } | |
831 | ||
832 | static int security_compute_sid(u32 ssid, | |
833 | u32 tsid, | |
834 | u16 tclass, | |
835 | u32 specified, | |
836 | u32 *out_sid) | |
837 | { | |
838 | struct context *scontext = NULL, *tcontext = NULL, newcontext; | |
839 | struct role_trans *roletr = NULL; | |
840 | struct avtab_key avkey; | |
841 | struct avtab_datum *avdatum; | |
842 | struct avtab_node *node; | |
1da177e4 LT |
843 | int rc = 0; |
844 | ||
845 | if (!ss_initialized) { | |
846 | switch (tclass) { | |
847 | case SECCLASS_PROCESS: | |
848 | *out_sid = ssid; | |
849 | break; | |
850 | default: | |
851 | *out_sid = tsid; | |
852 | break; | |
853 | } | |
854 | goto out; | |
855 | } | |
856 | ||
851f8a69 VY |
857 | context_init(&newcontext); |
858 | ||
1da177e4 LT |
859 | POLICY_RDLOCK; |
860 | ||
861 | scontext = sidtab_search(&sidtab, ssid); | |
862 | if (!scontext) { | |
863 | printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n", | |
864 | ssid); | |
865 | rc = -EINVAL; | |
866 | goto out_unlock; | |
867 | } | |
868 | tcontext = sidtab_search(&sidtab, tsid); | |
869 | if (!tcontext) { | |
870 | printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n", | |
871 | tsid); | |
872 | rc = -EINVAL; | |
873 | goto out_unlock; | |
874 | } | |
875 | ||
1da177e4 LT |
876 | /* Set the user identity. */ |
877 | switch (specified) { | |
878 | case AVTAB_TRANSITION: | |
879 | case AVTAB_CHANGE: | |
880 | /* Use the process user identity. */ | |
881 | newcontext.user = scontext->user; | |
882 | break; | |
883 | case AVTAB_MEMBER: | |
884 | /* Use the related object owner. */ | |
885 | newcontext.user = tcontext->user; | |
886 | break; | |
887 | } | |
888 | ||
889 | /* Set the role and type to default values. */ | |
890 | switch (tclass) { | |
891 | case SECCLASS_PROCESS: | |
892 | /* Use the current role and type of process. */ | |
893 | newcontext.role = scontext->role; | |
894 | newcontext.type = scontext->type; | |
895 | break; | |
896 | default: | |
897 | /* Use the well-defined object role. */ | |
898 | newcontext.role = OBJECT_R_VAL; | |
899 | /* Use the type of the related object. */ | |
900 | newcontext.type = tcontext->type; | |
901 | } | |
902 | ||
903 | /* Look for a type transition/member/change rule. */ | |
904 | avkey.source_type = scontext->type; | |
905 | avkey.target_type = tcontext->type; | |
906 | avkey.target_class = tclass; | |
782ebb99 SS |
907 | avkey.specified = specified; |
908 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
909 | |
910 | /* If no permanent rule, also check for enabled conditional rules */ | |
911 | if(!avdatum) { | |
782ebb99 | 912 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
1da177e4 | 913 | for (; node != NULL; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 914 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
915 | avdatum = &node->datum; |
916 | break; | |
917 | } | |
918 | } | |
919 | } | |
920 | ||
782ebb99 | 921 | if (avdatum) { |
1da177e4 | 922 | /* Use the type from the type transition/member/change rule. */ |
782ebb99 | 923 | newcontext.type = avdatum->data; |
1da177e4 LT |
924 | } |
925 | ||
926 | /* Check for class-specific changes. */ | |
927 | switch (tclass) { | |
928 | case SECCLASS_PROCESS: | |
929 | if (specified & AVTAB_TRANSITION) { | |
930 | /* Look for a role transition rule. */ | |
931 | for (roletr = policydb.role_tr; roletr; | |
932 | roletr = roletr->next) { | |
933 | if (roletr->role == scontext->role && | |
934 | roletr->type == tcontext->type) { | |
935 | /* Use the role transition rule. */ | |
936 | newcontext.role = roletr->new_role; | |
937 | break; | |
938 | } | |
939 | } | |
940 | } | |
941 | break; | |
942 | default: | |
943 | break; | |
944 | } | |
945 | ||
946 | /* Set the MLS attributes. | |
947 | This is done last because it may allocate memory. */ | |
948 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext); | |
949 | if (rc) | |
950 | goto out_unlock; | |
951 | ||
952 | /* Check the validity of the context. */ | |
953 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
954 | rc = compute_sid_handle_invalid_context(scontext, | |
955 | tcontext, | |
956 | tclass, | |
957 | &newcontext); | |
958 | if (rc) | |
959 | goto out_unlock; | |
960 | } | |
961 | /* Obtain the sid for the context. */ | |
962 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
963 | out_unlock: | |
964 | POLICY_RDUNLOCK; | |
965 | context_destroy(&newcontext); | |
966 | out: | |
967 | return rc; | |
968 | } | |
969 | ||
970 | /** | |
971 | * security_transition_sid - Compute the SID for a new subject/object. | |
972 | * @ssid: source security identifier | |
973 | * @tsid: target security identifier | |
974 | * @tclass: target security class | |
975 | * @out_sid: security identifier for new subject/object | |
976 | * | |
977 | * Compute a SID to use for labeling a new subject or object in the | |
978 | * class @tclass based on a SID pair (@ssid, @tsid). | |
979 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
980 | * if insufficient memory is available, or %0 if the new SID was | |
981 | * computed successfully. | |
982 | */ | |
983 | int security_transition_sid(u32 ssid, | |
984 | u32 tsid, | |
985 | u16 tclass, | |
986 | u32 *out_sid) | |
987 | { | |
988 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid); | |
989 | } | |
990 | ||
991 | /** | |
992 | * security_member_sid - Compute the SID for member selection. | |
993 | * @ssid: source security identifier | |
994 | * @tsid: target security identifier | |
995 | * @tclass: target security class | |
996 | * @out_sid: security identifier for selected member | |
997 | * | |
998 | * Compute a SID to use when selecting a member of a polyinstantiated | |
999 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1000 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1001 | * if insufficient memory is available, or %0 if the SID was | |
1002 | * computed successfully. | |
1003 | */ | |
1004 | int security_member_sid(u32 ssid, | |
1005 | u32 tsid, | |
1006 | u16 tclass, | |
1007 | u32 *out_sid) | |
1008 | { | |
1009 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid); | |
1010 | } | |
1011 | ||
1012 | /** | |
1013 | * security_change_sid - Compute the SID for object relabeling. | |
1014 | * @ssid: source security identifier | |
1015 | * @tsid: target security identifier | |
1016 | * @tclass: target security class | |
1017 | * @out_sid: security identifier for selected member | |
1018 | * | |
1019 | * Compute a SID to use for relabeling an object of class @tclass | |
1020 | * based on a SID pair (@ssid, @tsid). | |
1021 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1022 | * if insufficient memory is available, or %0 if the SID was | |
1023 | * computed successfully. | |
1024 | */ | |
1025 | int security_change_sid(u32 ssid, | |
1026 | u32 tsid, | |
1027 | u16 tclass, | |
1028 | u32 *out_sid) | |
1029 | { | |
1030 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid); | |
1031 | } | |
1032 | ||
b94c7e67 CS |
1033 | /* |
1034 | * Verify that each kernel class that is defined in the | |
1035 | * policy is correct | |
1036 | */ | |
1037 | static int validate_classes(struct policydb *p) | |
1038 | { | |
1039 | int i, j; | |
1040 | struct class_datum *cladatum; | |
1041 | struct perm_datum *perdatum; | |
1042 | u32 nprim, tmp, common_pts_len, perm_val, pol_val; | |
1043 | u16 class_val; | |
1044 | const struct selinux_class_perm *kdefs = &selinux_class_perm; | |
1045 | const char *def_class, *def_perm, *pol_class; | |
1046 | struct symtab *perms; | |
1047 | ||
1048 | for (i = 1; i < kdefs->cts_len; i++) { | |
1049 | def_class = kdefs->class_to_string[i]; | |
1050 | if (i > p->p_classes.nprim) { | |
1051 | printk(KERN_INFO | |
1052 | "security: class %s not defined in policy\n", | |
1053 | def_class); | |
1054 | continue; | |
1055 | } | |
1056 | pol_class = p->p_class_val_to_name[i-1]; | |
1057 | if (strcmp(pol_class, def_class)) { | |
1058 | printk(KERN_ERR | |
1059 | "security: class %d is incorrect, found %s but should be %s\n", | |
1060 | i, pol_class, def_class); | |
1061 | return -EINVAL; | |
1062 | } | |
1063 | } | |
1064 | for (i = 0; i < kdefs->av_pts_len; i++) { | |
1065 | class_val = kdefs->av_perm_to_string[i].tclass; | |
1066 | perm_val = kdefs->av_perm_to_string[i].value; | |
1067 | def_perm = kdefs->av_perm_to_string[i].name; | |
1068 | if (class_val > p->p_classes.nprim) | |
1069 | continue; | |
1070 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1071 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1072 | BUG_ON(!cladatum); | |
1073 | perms = &cladatum->permissions; | |
1074 | nprim = 1 << (perms->nprim - 1); | |
1075 | if (perm_val > nprim) { | |
1076 | printk(KERN_INFO | |
1077 | "security: permission %s in class %s not defined in policy\n", | |
1078 | def_perm, pol_class); | |
1079 | continue; | |
1080 | } | |
1081 | perdatum = hashtab_search(perms->table, def_perm); | |
1082 | if (perdatum == NULL) { | |
1083 | printk(KERN_ERR | |
1084 | "security: permission %s in class %s not found in policy\n", | |
1085 | def_perm, pol_class); | |
1086 | return -EINVAL; | |
1087 | } | |
1088 | pol_val = 1 << (perdatum->value - 1); | |
1089 | if (pol_val != perm_val) { | |
1090 | printk(KERN_ERR | |
1091 | "security: permission %s in class %s has incorrect value\n", | |
1092 | def_perm, pol_class); | |
1093 | return -EINVAL; | |
1094 | } | |
1095 | } | |
1096 | for (i = 0; i < kdefs->av_inherit_len; i++) { | |
1097 | class_val = kdefs->av_inherit[i].tclass; | |
1098 | if (class_val > p->p_classes.nprim) | |
1099 | continue; | |
1100 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1101 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1102 | BUG_ON(!cladatum); | |
1103 | if (!cladatum->comdatum) { | |
1104 | printk(KERN_ERR | |
1105 | "security: class %s should have an inherits clause but does not\n", | |
1106 | pol_class); | |
1107 | return -EINVAL; | |
1108 | } | |
1109 | tmp = kdefs->av_inherit[i].common_base; | |
1110 | common_pts_len = 0; | |
1111 | while (!(tmp & 0x01)) { | |
1112 | common_pts_len++; | |
1113 | tmp >>= 1; | |
1114 | } | |
1115 | perms = &cladatum->comdatum->permissions; | |
1116 | for (j = 0; j < common_pts_len; j++) { | |
1117 | def_perm = kdefs->av_inherit[i].common_pts[j]; | |
1118 | if (j >= perms->nprim) { | |
1119 | printk(KERN_INFO | |
1120 | "security: permission %s in class %s not defined in policy\n", | |
1121 | def_perm, pol_class); | |
1122 | continue; | |
1123 | } | |
1124 | perdatum = hashtab_search(perms->table, def_perm); | |
1125 | if (perdatum == NULL) { | |
1126 | printk(KERN_ERR | |
1127 | "security: permission %s in class %s not found in policy\n", | |
1128 | def_perm, pol_class); | |
1129 | return -EINVAL; | |
1130 | } | |
1131 | if (perdatum->value != j + 1) { | |
1132 | printk(KERN_ERR | |
1133 | "security: permission %s in class %s has incorrect value\n", | |
1134 | def_perm, pol_class); | |
1135 | return -EINVAL; | |
1136 | } | |
1137 | } | |
1138 | } | |
1139 | return 0; | |
1140 | } | |
1141 | ||
1da177e4 LT |
1142 | /* Clone the SID into the new SID table. */ |
1143 | static int clone_sid(u32 sid, | |
1144 | struct context *context, | |
1145 | void *arg) | |
1146 | { | |
1147 | struct sidtab *s = arg; | |
1148 | ||
1149 | return sidtab_insert(s, sid, context); | |
1150 | } | |
1151 | ||
1152 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1153 | { | |
1154 | int rc = 0; | |
1155 | ||
1156 | if (selinux_enforcing) { | |
1157 | rc = -EINVAL; | |
1158 | } else { | |
1159 | char *s; | |
1160 | u32 len; | |
1161 | ||
1162 | context_struct_to_string(context, &s, &len); | |
1163 | printk(KERN_ERR "security: context %s is invalid\n", s); | |
1164 | kfree(s); | |
1165 | } | |
1166 | return rc; | |
1167 | } | |
1168 | ||
1169 | struct convert_context_args { | |
1170 | struct policydb *oldp; | |
1171 | struct policydb *newp; | |
1172 | }; | |
1173 | ||
1174 | /* | |
1175 | * Convert the values in the security context | |
1176 | * structure `c' from the values specified | |
1177 | * in the policy `p->oldp' to the values specified | |
1178 | * in the policy `p->newp'. Verify that the | |
1179 | * context is valid under the new policy. | |
1180 | */ | |
1181 | static int convert_context(u32 key, | |
1182 | struct context *c, | |
1183 | void *p) | |
1184 | { | |
1185 | struct convert_context_args *args; | |
1186 | struct context oldc; | |
1187 | struct role_datum *role; | |
1188 | struct type_datum *typdatum; | |
1189 | struct user_datum *usrdatum; | |
1190 | char *s; | |
1191 | u32 len; | |
1192 | int rc; | |
1193 | ||
1194 | args = p; | |
1195 | ||
1196 | rc = context_cpy(&oldc, c); | |
1197 | if (rc) | |
1198 | goto out; | |
1199 | ||
1200 | rc = -EINVAL; | |
1201 | ||
1202 | /* Convert the user. */ | |
1203 | usrdatum = hashtab_search(args->newp->p_users.table, | |
1204 | args->oldp->p_user_val_to_name[c->user - 1]); | |
1205 | if (!usrdatum) { | |
1206 | goto bad; | |
1207 | } | |
1208 | c->user = usrdatum->value; | |
1209 | ||
1210 | /* Convert the role. */ | |
1211 | role = hashtab_search(args->newp->p_roles.table, | |
1212 | args->oldp->p_role_val_to_name[c->role - 1]); | |
1213 | if (!role) { | |
1214 | goto bad; | |
1215 | } | |
1216 | c->role = role->value; | |
1217 | ||
1218 | /* Convert the type. */ | |
1219 | typdatum = hashtab_search(args->newp->p_types.table, | |
1220 | args->oldp->p_type_val_to_name[c->type - 1]); | |
1221 | if (!typdatum) { | |
1222 | goto bad; | |
1223 | } | |
1224 | c->type = typdatum->value; | |
1225 | ||
1226 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1227 | if (rc) | |
1228 | goto bad; | |
1229 | ||
1230 | /* Check the validity of the new context. */ | |
1231 | if (!policydb_context_isvalid(args->newp, c)) { | |
1232 | rc = convert_context_handle_invalid_context(&oldc); | |
1233 | if (rc) | |
1234 | goto bad; | |
1235 | } | |
1236 | ||
1237 | context_destroy(&oldc); | |
1238 | out: | |
1239 | return rc; | |
1240 | bad: | |
1241 | context_struct_to_string(&oldc, &s, &len); | |
1242 | context_destroy(&oldc); | |
1243 | printk(KERN_ERR "security: invalidating context %s\n", s); | |
1244 | kfree(s); | |
1245 | goto out; | |
1246 | } | |
1247 | ||
1248 | extern void selinux_complete_init(void); | |
1249 | ||
1250 | /** | |
1251 | * security_load_policy - Load a security policy configuration. | |
1252 | * @data: binary policy data | |
1253 | * @len: length of data in bytes | |
1254 | * | |
1255 | * Load a new set of security policy configuration data, | |
1256 | * validate it and convert the SID table as necessary. | |
1257 | * This function will flush the access vector cache after | |
1258 | * loading the new policy. | |
1259 | */ | |
1260 | int security_load_policy(void *data, size_t len) | |
1261 | { | |
1262 | struct policydb oldpolicydb, newpolicydb; | |
1263 | struct sidtab oldsidtab, newsidtab; | |
1264 | struct convert_context_args args; | |
1265 | u32 seqno; | |
1266 | int rc = 0; | |
1267 | struct policy_file file = { data, len }, *fp = &file; | |
1268 | ||
1269 | LOAD_LOCK; | |
1270 | ||
1271 | if (!ss_initialized) { | |
1272 | avtab_cache_init(); | |
1273 | if (policydb_read(&policydb, fp)) { | |
1274 | LOAD_UNLOCK; | |
1275 | avtab_cache_destroy(); | |
1276 | return -EINVAL; | |
1277 | } | |
1278 | if (policydb_load_isids(&policydb, &sidtab)) { | |
1279 | LOAD_UNLOCK; | |
1280 | policydb_destroy(&policydb); | |
1281 | avtab_cache_destroy(); | |
1282 | return -EINVAL; | |
1283 | } | |
b94c7e67 CS |
1284 | /* Verify that the kernel defined classes are correct. */ |
1285 | if (validate_classes(&policydb)) { | |
1286 | printk(KERN_ERR | |
1287 | "security: the definition of a class is incorrect\n"); | |
1288 | LOAD_UNLOCK; | |
1289 | sidtab_destroy(&sidtab); | |
1290 | policydb_destroy(&policydb); | |
1291 | avtab_cache_destroy(); | |
1292 | return -EINVAL; | |
1293 | } | |
1da177e4 LT |
1294 | policydb_loaded_version = policydb.policyvers; |
1295 | ss_initialized = 1; | |
4c443d1b | 1296 | seqno = ++latest_granting; |
1da177e4 LT |
1297 | LOAD_UNLOCK; |
1298 | selinux_complete_init(); | |
4c443d1b SS |
1299 | avc_ss_reset(seqno); |
1300 | selnl_notify_policyload(seqno); | |
7420ed23 | 1301 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1302 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1303 | return 0; |
1304 | } | |
1305 | ||
1306 | #if 0 | |
1307 | sidtab_hash_eval(&sidtab, "sids"); | |
1308 | #endif | |
1309 | ||
1310 | if (policydb_read(&newpolicydb, fp)) { | |
1311 | LOAD_UNLOCK; | |
1312 | return -EINVAL; | |
1313 | } | |
1314 | ||
1315 | sidtab_init(&newsidtab); | |
1316 | ||
b94c7e67 CS |
1317 | /* Verify that the kernel defined classes are correct. */ |
1318 | if (validate_classes(&newpolicydb)) { | |
1319 | printk(KERN_ERR | |
1320 | "security: the definition of a class is incorrect\n"); | |
1321 | rc = -EINVAL; | |
1322 | goto err; | |
1323 | } | |
1324 | ||
1da177e4 LT |
1325 | /* Clone the SID table. */ |
1326 | sidtab_shutdown(&sidtab); | |
1327 | if (sidtab_map(&sidtab, clone_sid, &newsidtab)) { | |
1328 | rc = -ENOMEM; | |
1329 | goto err; | |
1330 | } | |
1331 | ||
1332 | /* Convert the internal representations of contexts | |
1333 | in the new SID table and remove invalid SIDs. */ | |
1334 | args.oldp = &policydb; | |
1335 | args.newp = &newpolicydb; | |
1336 | sidtab_map_remove_on_error(&newsidtab, convert_context, &args); | |
1337 | ||
1338 | /* Save the old policydb and SID table to free later. */ | |
1339 | memcpy(&oldpolicydb, &policydb, sizeof policydb); | |
1340 | sidtab_set(&oldsidtab, &sidtab); | |
1341 | ||
1342 | /* Install the new policydb and SID table. */ | |
1343 | POLICY_WRLOCK; | |
1344 | memcpy(&policydb, &newpolicydb, sizeof policydb); | |
1345 | sidtab_set(&sidtab, &newsidtab); | |
1346 | seqno = ++latest_granting; | |
1347 | policydb_loaded_version = policydb.policyvers; | |
1348 | POLICY_WRUNLOCK; | |
1349 | LOAD_UNLOCK; | |
1350 | ||
1351 | /* Free the old policydb and SID table. */ | |
1352 | policydb_destroy(&oldpolicydb); | |
1353 | sidtab_destroy(&oldsidtab); | |
1354 | ||
1355 | avc_ss_reset(seqno); | |
1356 | selnl_notify_policyload(seqno); | |
7420ed23 | 1357 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1358 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1359 | |
1360 | return 0; | |
1361 | ||
1362 | err: | |
1363 | LOAD_UNLOCK; | |
1364 | sidtab_destroy(&newsidtab); | |
1365 | policydb_destroy(&newpolicydb); | |
1366 | return rc; | |
1367 | ||
1368 | } | |
1369 | ||
1370 | /** | |
1371 | * security_port_sid - Obtain the SID for a port. | |
1372 | * @domain: communication domain aka address family | |
1373 | * @type: socket type | |
1374 | * @protocol: protocol number | |
1375 | * @port: port number | |
1376 | * @out_sid: security identifier | |
1377 | */ | |
1378 | int security_port_sid(u16 domain, | |
1379 | u16 type, | |
1380 | u8 protocol, | |
1381 | u16 port, | |
1382 | u32 *out_sid) | |
1383 | { | |
1384 | struct ocontext *c; | |
1385 | int rc = 0; | |
1386 | ||
1387 | POLICY_RDLOCK; | |
1388 | ||
1389 | c = policydb.ocontexts[OCON_PORT]; | |
1390 | while (c) { | |
1391 | if (c->u.port.protocol == protocol && | |
1392 | c->u.port.low_port <= port && | |
1393 | c->u.port.high_port >= port) | |
1394 | break; | |
1395 | c = c->next; | |
1396 | } | |
1397 | ||
1398 | if (c) { | |
1399 | if (!c->sid[0]) { | |
1400 | rc = sidtab_context_to_sid(&sidtab, | |
1401 | &c->context[0], | |
1402 | &c->sid[0]); | |
1403 | if (rc) | |
1404 | goto out; | |
1405 | } | |
1406 | *out_sid = c->sid[0]; | |
1407 | } else { | |
1408 | *out_sid = SECINITSID_PORT; | |
1409 | } | |
1410 | ||
1411 | out: | |
1412 | POLICY_RDUNLOCK; | |
1413 | return rc; | |
1414 | } | |
1415 | ||
1416 | /** | |
1417 | * security_netif_sid - Obtain the SID for a network interface. | |
1418 | * @name: interface name | |
1419 | * @if_sid: interface SID | |
1420 | * @msg_sid: default SID for received packets | |
1421 | */ | |
1422 | int security_netif_sid(char *name, | |
1423 | u32 *if_sid, | |
1424 | u32 *msg_sid) | |
1425 | { | |
1426 | int rc = 0; | |
1427 | struct ocontext *c; | |
1428 | ||
1429 | POLICY_RDLOCK; | |
1430 | ||
1431 | c = policydb.ocontexts[OCON_NETIF]; | |
1432 | while (c) { | |
1433 | if (strcmp(name, c->u.name) == 0) | |
1434 | break; | |
1435 | c = c->next; | |
1436 | } | |
1437 | ||
1438 | if (c) { | |
1439 | if (!c->sid[0] || !c->sid[1]) { | |
1440 | rc = sidtab_context_to_sid(&sidtab, | |
1441 | &c->context[0], | |
1442 | &c->sid[0]); | |
1443 | if (rc) | |
1444 | goto out; | |
1445 | rc = sidtab_context_to_sid(&sidtab, | |
1446 | &c->context[1], | |
1447 | &c->sid[1]); | |
1448 | if (rc) | |
1449 | goto out; | |
1450 | } | |
1451 | *if_sid = c->sid[0]; | |
1452 | *msg_sid = c->sid[1]; | |
1453 | } else { | |
1454 | *if_sid = SECINITSID_NETIF; | |
1455 | *msg_sid = SECINITSID_NETMSG; | |
1456 | } | |
1457 | ||
1458 | out: | |
1459 | POLICY_RDUNLOCK; | |
1460 | return rc; | |
1461 | } | |
1462 | ||
1463 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
1464 | { | |
1465 | int i, fail = 0; | |
1466 | ||
1467 | for(i = 0; i < 4; i++) | |
1468 | if(addr[i] != (input[i] & mask[i])) { | |
1469 | fail = 1; | |
1470 | break; | |
1471 | } | |
1472 | ||
1473 | return !fail; | |
1474 | } | |
1475 | ||
1476 | /** | |
1477 | * security_node_sid - Obtain the SID for a node (host). | |
1478 | * @domain: communication domain aka address family | |
1479 | * @addrp: address | |
1480 | * @addrlen: address length in bytes | |
1481 | * @out_sid: security identifier | |
1482 | */ | |
1483 | int security_node_sid(u16 domain, | |
1484 | void *addrp, | |
1485 | u32 addrlen, | |
1486 | u32 *out_sid) | |
1487 | { | |
1488 | int rc = 0; | |
1489 | struct ocontext *c; | |
1490 | ||
1491 | POLICY_RDLOCK; | |
1492 | ||
1493 | switch (domain) { | |
1494 | case AF_INET: { | |
1495 | u32 addr; | |
1496 | ||
1497 | if (addrlen != sizeof(u32)) { | |
1498 | rc = -EINVAL; | |
1499 | goto out; | |
1500 | } | |
1501 | ||
1502 | addr = *((u32 *)addrp); | |
1503 | ||
1504 | c = policydb.ocontexts[OCON_NODE]; | |
1505 | while (c) { | |
1506 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
1507 | break; | |
1508 | c = c->next; | |
1509 | } | |
1510 | break; | |
1511 | } | |
1512 | ||
1513 | case AF_INET6: | |
1514 | if (addrlen != sizeof(u64) * 2) { | |
1515 | rc = -EINVAL; | |
1516 | goto out; | |
1517 | } | |
1518 | c = policydb.ocontexts[OCON_NODE6]; | |
1519 | while (c) { | |
1520 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
1521 | c->u.node6.mask)) | |
1522 | break; | |
1523 | c = c->next; | |
1524 | } | |
1525 | break; | |
1526 | ||
1527 | default: | |
1528 | *out_sid = SECINITSID_NODE; | |
1529 | goto out; | |
1530 | } | |
1531 | ||
1532 | if (c) { | |
1533 | if (!c->sid[0]) { | |
1534 | rc = sidtab_context_to_sid(&sidtab, | |
1535 | &c->context[0], | |
1536 | &c->sid[0]); | |
1537 | if (rc) | |
1538 | goto out; | |
1539 | } | |
1540 | *out_sid = c->sid[0]; | |
1541 | } else { | |
1542 | *out_sid = SECINITSID_NODE; | |
1543 | } | |
1544 | ||
1545 | out: | |
1546 | POLICY_RDUNLOCK; | |
1547 | return rc; | |
1548 | } | |
1549 | ||
1550 | #define SIDS_NEL 25 | |
1551 | ||
1552 | /** | |
1553 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
1554 | * @fromsid: starting SID | |
1555 | * @username: username | |
1556 | * @sids: array of reachable SIDs for user | |
1557 | * @nel: number of elements in @sids | |
1558 | * | |
1559 | * Generate the set of SIDs for legal security contexts | |
1560 | * for a given user that can be reached by @fromsid. | |
1561 | * Set *@sids to point to a dynamically allocated | |
1562 | * array containing the set of SIDs. Set *@nel to the | |
1563 | * number of elements in the array. | |
1564 | */ | |
1565 | ||
1566 | int security_get_user_sids(u32 fromsid, | |
1567 | char *username, | |
1568 | u32 **sids, | |
1569 | u32 *nel) | |
1570 | { | |
1571 | struct context *fromcon, usercon; | |
1572 | u32 *mysids, *mysids2, sid; | |
1573 | u32 mynel = 0, maxnel = SIDS_NEL; | |
1574 | struct user_datum *user; | |
1575 | struct role_datum *role; | |
1576 | struct av_decision avd; | |
782ebb99 | 1577 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
1578 | int rc = 0, i, j; |
1579 | ||
1580 | if (!ss_initialized) { | |
1581 | *sids = NULL; | |
1582 | *nel = 0; | |
1583 | goto out; | |
1584 | } | |
1585 | ||
1586 | POLICY_RDLOCK; | |
1587 | ||
1588 | fromcon = sidtab_search(&sidtab, fromsid); | |
1589 | if (!fromcon) { | |
1590 | rc = -EINVAL; | |
1591 | goto out_unlock; | |
1592 | } | |
1593 | ||
1594 | user = hashtab_search(policydb.p_users.table, username); | |
1595 | if (!user) { | |
1596 | rc = -EINVAL; | |
1597 | goto out_unlock; | |
1598 | } | |
1599 | usercon.user = user->value; | |
1600 | ||
89d155ef | 1601 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
1da177e4 LT |
1602 | if (!mysids) { |
1603 | rc = -ENOMEM; | |
1604 | goto out_unlock; | |
1605 | } | |
1da177e4 | 1606 | |
782ebb99 SS |
1607 | ebitmap_for_each_bit(&user->roles, rnode, i) { |
1608 | if (!ebitmap_node_get_bit(rnode, i)) | |
1da177e4 LT |
1609 | continue; |
1610 | role = policydb.role_val_to_struct[i]; | |
1611 | usercon.role = i+1; | |
782ebb99 SS |
1612 | ebitmap_for_each_bit(&role->types, tnode, j) { |
1613 | if (!ebitmap_node_get_bit(tnode, j)) | |
1da177e4 LT |
1614 | continue; |
1615 | usercon.type = j+1; | |
1616 | ||
1617 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
1618 | continue; | |
1619 | ||
1620 | rc = context_struct_compute_av(fromcon, &usercon, | |
1621 | SECCLASS_PROCESS, | |
1622 | PROCESS__TRANSITION, | |
1623 | &avd); | |
1624 | if (rc || !(avd.allowed & PROCESS__TRANSITION)) | |
1625 | continue; | |
1626 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); | |
1627 | if (rc) { | |
1628 | kfree(mysids); | |
1629 | goto out_unlock; | |
1630 | } | |
1631 | if (mynel < maxnel) { | |
1632 | mysids[mynel++] = sid; | |
1633 | } else { | |
1634 | maxnel += SIDS_NEL; | |
89d155ef | 1635 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
1da177e4 LT |
1636 | if (!mysids2) { |
1637 | rc = -ENOMEM; | |
1638 | kfree(mysids); | |
1639 | goto out_unlock; | |
1640 | } | |
1da177e4 LT |
1641 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
1642 | kfree(mysids); | |
1643 | mysids = mysids2; | |
1644 | mysids[mynel++] = sid; | |
1645 | } | |
1646 | } | |
1647 | } | |
1648 | ||
1649 | *sids = mysids; | |
1650 | *nel = mynel; | |
1651 | ||
1652 | out_unlock: | |
1653 | POLICY_RDUNLOCK; | |
1654 | out: | |
1655 | return rc; | |
1656 | } | |
1657 | ||
1658 | /** | |
1659 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
1660 | * @fstype: filesystem type | |
1661 | * @path: path from root of mount | |
1662 | * @sclass: file security class | |
1663 | * @sid: SID for path | |
1664 | * | |
1665 | * Obtain a SID to use for a file in a filesystem that | |
1666 | * cannot support xattr or use a fixed labeling behavior like | |
1667 | * transition SIDs or task SIDs. | |
1668 | */ | |
1669 | int security_genfs_sid(const char *fstype, | |
1670 | char *path, | |
1671 | u16 sclass, | |
1672 | u32 *sid) | |
1673 | { | |
1674 | int len; | |
1675 | struct genfs *genfs; | |
1676 | struct ocontext *c; | |
1677 | int rc = 0, cmp = 0; | |
1678 | ||
1679 | POLICY_RDLOCK; | |
1680 | ||
1681 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { | |
1682 | cmp = strcmp(fstype, genfs->fstype); | |
1683 | if (cmp <= 0) | |
1684 | break; | |
1685 | } | |
1686 | ||
1687 | if (!genfs || cmp) { | |
1688 | *sid = SECINITSID_UNLABELED; | |
1689 | rc = -ENOENT; | |
1690 | goto out; | |
1691 | } | |
1692 | ||
1693 | for (c = genfs->head; c; c = c->next) { | |
1694 | len = strlen(c->u.name); | |
1695 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
1696 | (strncmp(c->u.name, path, len) == 0)) | |
1697 | break; | |
1698 | } | |
1699 | ||
1700 | if (!c) { | |
1701 | *sid = SECINITSID_UNLABELED; | |
1702 | rc = -ENOENT; | |
1703 | goto out; | |
1704 | } | |
1705 | ||
1706 | if (!c->sid[0]) { | |
1707 | rc = sidtab_context_to_sid(&sidtab, | |
1708 | &c->context[0], | |
1709 | &c->sid[0]); | |
1710 | if (rc) | |
1711 | goto out; | |
1712 | } | |
1713 | ||
1714 | *sid = c->sid[0]; | |
1715 | out: | |
1716 | POLICY_RDUNLOCK; | |
1717 | return rc; | |
1718 | } | |
1719 | ||
1720 | /** | |
1721 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
1722 | * @fstype: filesystem type | |
1723 | * @behavior: labeling behavior | |
1724 | * @sid: SID for filesystem (superblock) | |
1725 | */ | |
1726 | int security_fs_use( | |
1727 | const char *fstype, | |
1728 | unsigned int *behavior, | |
1729 | u32 *sid) | |
1730 | { | |
1731 | int rc = 0; | |
1732 | struct ocontext *c; | |
1733 | ||
1734 | POLICY_RDLOCK; | |
1735 | ||
1736 | c = policydb.ocontexts[OCON_FSUSE]; | |
1737 | while (c) { | |
1738 | if (strcmp(fstype, c->u.name) == 0) | |
1739 | break; | |
1740 | c = c->next; | |
1741 | } | |
1742 | ||
1743 | if (c) { | |
1744 | *behavior = c->v.behavior; | |
1745 | if (!c->sid[0]) { | |
1746 | rc = sidtab_context_to_sid(&sidtab, | |
1747 | &c->context[0], | |
1748 | &c->sid[0]); | |
1749 | if (rc) | |
1750 | goto out; | |
1751 | } | |
1752 | *sid = c->sid[0]; | |
1753 | } else { | |
1754 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); | |
1755 | if (rc) { | |
1756 | *behavior = SECURITY_FS_USE_NONE; | |
1757 | rc = 0; | |
1758 | } else { | |
1759 | *behavior = SECURITY_FS_USE_GENFS; | |
1760 | } | |
1761 | } | |
1762 | ||
1763 | out: | |
1764 | POLICY_RDUNLOCK; | |
1765 | return rc; | |
1766 | } | |
1767 | ||
1768 | int security_get_bools(int *len, char ***names, int **values) | |
1769 | { | |
1770 | int i, rc = -ENOMEM; | |
1771 | ||
1772 | POLICY_RDLOCK; | |
1773 | *names = NULL; | |
1774 | *values = NULL; | |
1775 | ||
1776 | *len = policydb.p_bools.nprim; | |
1777 | if (!*len) { | |
1778 | rc = 0; | |
1779 | goto out; | |
1780 | } | |
1781 | ||
e0795cf4 | 1782 | *names = kcalloc(*len, sizeof(char*), GFP_ATOMIC); |
1da177e4 LT |
1783 | if (!*names) |
1784 | goto err; | |
1da177e4 | 1785 | |
e0795cf4 | 1786 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); |
1da177e4 LT |
1787 | if (!*values) |
1788 | goto err; | |
1789 | ||
1790 | for (i = 0; i < *len; i++) { | |
1791 | size_t name_len; | |
1792 | (*values)[i] = policydb.bool_val_to_struct[i]->state; | |
1793 | name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; | |
e0795cf4 | 1794 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); |
1da177e4 LT |
1795 | if (!(*names)[i]) |
1796 | goto err; | |
1797 | strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); | |
1798 | (*names)[i][name_len - 1] = 0; | |
1799 | } | |
1800 | rc = 0; | |
1801 | out: | |
1802 | POLICY_RDUNLOCK; | |
1803 | return rc; | |
1804 | err: | |
1805 | if (*names) { | |
1806 | for (i = 0; i < *len; i++) | |
9a5f04bf | 1807 | kfree((*names)[i]); |
1da177e4 | 1808 | } |
9a5f04bf | 1809 | kfree(*values); |
1da177e4 LT |
1810 | goto out; |
1811 | } | |
1812 | ||
1813 | ||
1814 | int security_set_bools(int len, int *values) | |
1815 | { | |
1816 | int i, rc = 0; | |
1817 | int lenp, seqno = 0; | |
1818 | struct cond_node *cur; | |
1819 | ||
1820 | POLICY_WRLOCK; | |
1821 | ||
1822 | lenp = policydb.p_bools.nprim; | |
1823 | if (len != lenp) { | |
1824 | rc = -EFAULT; | |
1825 | goto out; | |
1826 | } | |
1827 | ||
1da177e4 | 1828 | for (i = 0; i < len; i++) { |
af601e46 SG |
1829 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
1830 | audit_log(current->audit_context, GFP_ATOMIC, | |
1831 | AUDIT_MAC_CONFIG_CHANGE, | |
1832 | "bool=%s val=%d old_val=%d auid=%u", | |
1833 | policydb.p_bool_val_to_name[i], | |
1834 | !!values[i], | |
1835 | policydb.bool_val_to_struct[i]->state, | |
1836 | audit_get_loginuid(current->audit_context)); | |
1837 | } | |
1da177e4 LT |
1838 | if (values[i]) { |
1839 | policydb.bool_val_to_struct[i]->state = 1; | |
1840 | } else { | |
1841 | policydb.bool_val_to_struct[i]->state = 0; | |
1842 | } | |
1da177e4 | 1843 | } |
1da177e4 LT |
1844 | |
1845 | for (cur = policydb.cond_list; cur != NULL; cur = cur->next) { | |
1846 | rc = evaluate_cond_node(&policydb, cur); | |
1847 | if (rc) | |
1848 | goto out; | |
1849 | } | |
1850 | ||
1851 | seqno = ++latest_granting; | |
1852 | ||
1853 | out: | |
1854 | POLICY_WRUNLOCK; | |
1855 | if (!rc) { | |
1856 | avc_ss_reset(seqno); | |
1857 | selnl_notify_policyload(seqno); | |
342a0cff | 1858 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1859 | } |
1860 | return rc; | |
1861 | } | |
1862 | ||
1863 | int security_get_bool_value(int bool) | |
1864 | { | |
1865 | int rc = 0; | |
1866 | int len; | |
1867 | ||
1868 | POLICY_RDLOCK; | |
1869 | ||
1870 | len = policydb.p_bools.nprim; | |
1871 | if (bool >= len) { | |
1872 | rc = -EFAULT; | |
1873 | goto out; | |
1874 | } | |
1875 | ||
1876 | rc = policydb.bool_val_to_struct[bool]->state; | |
1877 | out: | |
1878 | POLICY_RDUNLOCK; | |
1879 | return rc; | |
1880 | } | |
376bd9cb | 1881 | |
08554d6b VY |
1882 | /* |
1883 | * security_sid_mls_copy() - computes a new sid based on the given | |
1884 | * sid and the mls portion of mls_sid. | |
1885 | */ | |
1886 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
1887 | { | |
1888 | struct context *context1; | |
1889 | struct context *context2; | |
1890 | struct context newcon; | |
1891 | char *s; | |
1892 | u32 len; | |
1893 | int rc = 0; | |
1894 | ||
4eb327b5 | 1895 | if (!ss_initialized || !selinux_mls_enabled) { |
08554d6b VY |
1896 | *new_sid = sid; |
1897 | goto out; | |
1898 | } | |
1899 | ||
1900 | context_init(&newcon); | |
1901 | ||
1902 | POLICY_RDLOCK; | |
1903 | context1 = sidtab_search(&sidtab, sid); | |
1904 | if (!context1) { | |
1905 | printk(KERN_ERR "security_sid_mls_copy: unrecognized SID " | |
1906 | "%d\n", sid); | |
1907 | rc = -EINVAL; | |
1908 | goto out_unlock; | |
1909 | } | |
1910 | ||
1911 | context2 = sidtab_search(&sidtab, mls_sid); | |
1912 | if (!context2) { | |
1913 | printk(KERN_ERR "security_sid_mls_copy: unrecognized SID " | |
1914 | "%d\n", mls_sid); | |
1915 | rc = -EINVAL; | |
1916 | goto out_unlock; | |
1917 | } | |
1918 | ||
1919 | newcon.user = context1->user; | |
1920 | newcon.role = context1->role; | |
1921 | newcon.type = context1->type; | |
0efc61ea | 1922 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
1923 | if (rc) |
1924 | goto out_unlock; | |
1925 | ||
08554d6b VY |
1926 | /* Check the validity of the new context. */ |
1927 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
1928 | rc = convert_context_handle_invalid_context(&newcon); | |
1929 | if (rc) | |
1930 | goto bad; | |
1931 | } | |
1932 | ||
1933 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
1934 | goto out_unlock; | |
1935 | ||
1936 | bad: | |
1937 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
1938 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
1939 | "security_sid_mls_copy: invalid context %s", s); | |
1940 | kfree(s); | |
1941 | } | |
1942 | ||
1943 | out_unlock: | |
1944 | POLICY_RDUNLOCK; | |
1945 | context_destroy(&newcon); | |
1946 | out: | |
1947 | return rc; | |
1948 | } | |
1949 | ||
376bd9cb DG |
1950 | struct selinux_audit_rule { |
1951 | u32 au_seqno; | |
1952 | struct context au_ctxt; | |
1953 | }; | |
1954 | ||
1955 | void selinux_audit_rule_free(struct selinux_audit_rule *rule) | |
1956 | { | |
1957 | if (rule) { | |
1958 | context_destroy(&rule->au_ctxt); | |
1959 | kfree(rule); | |
1960 | } | |
1961 | } | |
1962 | ||
1963 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, | |
1964 | struct selinux_audit_rule **rule) | |
1965 | { | |
1966 | struct selinux_audit_rule *tmprule; | |
1967 | struct role_datum *roledatum; | |
1968 | struct type_datum *typedatum; | |
1969 | struct user_datum *userdatum; | |
1970 | int rc = 0; | |
1971 | ||
1972 | *rule = NULL; | |
1973 | ||
1974 | if (!ss_initialized) | |
1975 | return -ENOTSUPP; | |
1976 | ||
1977 | switch (field) { | |
3a6b9f85 DG |
1978 | case AUDIT_SUBJ_USER: |
1979 | case AUDIT_SUBJ_ROLE: | |
1980 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
1981 | case AUDIT_OBJ_USER: |
1982 | case AUDIT_OBJ_ROLE: | |
1983 | case AUDIT_OBJ_TYPE: | |
376bd9cb DG |
1984 | /* only 'equals' and 'not equals' fit user, role, and type */ |
1985 | if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL) | |
1986 | return -EINVAL; | |
1987 | break; | |
3a6b9f85 DG |
1988 | case AUDIT_SUBJ_SEN: |
1989 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
1990 | case AUDIT_OBJ_LEV_LOW: |
1991 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
1992 | /* we do not allow a range, indicated by the presense of '-' */ |
1993 | if (strchr(rulestr, '-')) | |
1994 | return -EINVAL; | |
1995 | break; | |
1996 | default: | |
1997 | /* only the above fields are valid */ | |
1998 | return -EINVAL; | |
1999 | } | |
2000 | ||
2001 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
2002 | if (!tmprule) | |
2003 | return -ENOMEM; | |
2004 | ||
2005 | context_init(&tmprule->au_ctxt); | |
2006 | ||
2007 | POLICY_RDLOCK; | |
2008 | ||
2009 | tmprule->au_seqno = latest_granting; | |
2010 | ||
2011 | switch (field) { | |
3a6b9f85 | 2012 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2013 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2014 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
2015 | if (!userdatum) | |
2016 | rc = -EINVAL; | |
2017 | else | |
2018 | tmprule->au_ctxt.user = userdatum->value; | |
2019 | break; | |
3a6b9f85 | 2020 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2021 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2022 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
2023 | if (!roledatum) | |
2024 | rc = -EINVAL; | |
2025 | else | |
2026 | tmprule->au_ctxt.role = roledatum->value; | |
2027 | break; | |
3a6b9f85 | 2028 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2029 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2030 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
2031 | if (!typedatum) | |
2032 | rc = -EINVAL; | |
2033 | else | |
2034 | tmprule->au_ctxt.type = typedatum->value; | |
2035 | break; | |
3a6b9f85 DG |
2036 | case AUDIT_SUBJ_SEN: |
2037 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2038 | case AUDIT_OBJ_LEV_LOW: |
2039 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2040 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
2041 | break; | |
2042 | } | |
2043 | ||
2044 | POLICY_RDUNLOCK; | |
2045 | ||
2046 | if (rc) { | |
2047 | selinux_audit_rule_free(tmprule); | |
2048 | tmprule = NULL; | |
2049 | } | |
2050 | ||
2051 | *rule = tmprule; | |
2052 | ||
2053 | return rc; | |
2054 | } | |
2055 | ||
9a2f44f0 | 2056 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, |
376bd9cb DG |
2057 | struct selinux_audit_rule *rule, |
2058 | struct audit_context *actx) | |
2059 | { | |
2060 | struct context *ctxt; | |
2061 | struct mls_level *level; | |
2062 | int match = 0; | |
2063 | ||
2064 | if (!rule) { | |
2065 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2066 | "selinux_audit_rule_match: missing rule\n"); | |
2067 | return -ENOENT; | |
2068 | } | |
2069 | ||
2070 | POLICY_RDLOCK; | |
2071 | ||
2072 | if (rule->au_seqno < latest_granting) { | |
2073 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2074 | "selinux_audit_rule_match: stale rule\n"); | |
2075 | match = -ESTALE; | |
2076 | goto out; | |
2077 | } | |
2078 | ||
9a2f44f0 | 2079 | ctxt = sidtab_search(&sidtab, sid); |
376bd9cb DG |
2080 | if (!ctxt) { |
2081 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2082 | "selinux_audit_rule_match: unrecognized SID %d\n", | |
9a2f44f0 | 2083 | sid); |
376bd9cb DG |
2084 | match = -ENOENT; |
2085 | goto out; | |
2086 | } | |
2087 | ||
2088 | /* a field/op pair that is not caught here will simply fall through | |
2089 | without a match */ | |
2090 | switch (field) { | |
3a6b9f85 | 2091 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2092 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2093 | switch (op) { |
2094 | case AUDIT_EQUAL: | |
2095 | match = (ctxt->user == rule->au_ctxt.user); | |
2096 | break; | |
2097 | case AUDIT_NOT_EQUAL: | |
2098 | match = (ctxt->user != rule->au_ctxt.user); | |
2099 | break; | |
2100 | } | |
2101 | break; | |
3a6b9f85 | 2102 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2103 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2104 | switch (op) { |
2105 | case AUDIT_EQUAL: | |
2106 | match = (ctxt->role == rule->au_ctxt.role); | |
2107 | break; | |
2108 | case AUDIT_NOT_EQUAL: | |
2109 | match = (ctxt->role != rule->au_ctxt.role); | |
2110 | break; | |
2111 | } | |
2112 | break; | |
3a6b9f85 | 2113 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2114 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2115 | switch (op) { |
2116 | case AUDIT_EQUAL: | |
2117 | match = (ctxt->type == rule->au_ctxt.type); | |
2118 | break; | |
2119 | case AUDIT_NOT_EQUAL: | |
2120 | match = (ctxt->type != rule->au_ctxt.type); | |
2121 | break; | |
2122 | } | |
2123 | break; | |
3a6b9f85 DG |
2124 | case AUDIT_SUBJ_SEN: |
2125 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2126 | case AUDIT_OBJ_LEV_LOW: |
2127 | case AUDIT_OBJ_LEV_HIGH: | |
2128 | level = ((field == AUDIT_SUBJ_SEN || | |
2129 | field == AUDIT_OBJ_LEV_LOW) ? | |
376bd9cb DG |
2130 | &ctxt->range.level[0] : &ctxt->range.level[1]); |
2131 | switch (op) { | |
2132 | case AUDIT_EQUAL: | |
2133 | match = mls_level_eq(&rule->au_ctxt.range.level[0], | |
2134 | level); | |
2135 | break; | |
2136 | case AUDIT_NOT_EQUAL: | |
2137 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2138 | level); | |
2139 | break; | |
2140 | case AUDIT_LESS_THAN: | |
2141 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], | |
2142 | level) && | |
2143 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2144 | level)); | |
2145 | break; | |
2146 | case AUDIT_LESS_THAN_OR_EQUAL: | |
2147 | match = mls_level_dom(&rule->au_ctxt.range.level[0], | |
2148 | level); | |
2149 | break; | |
2150 | case AUDIT_GREATER_THAN: | |
2151 | match = (mls_level_dom(level, | |
2152 | &rule->au_ctxt.range.level[0]) && | |
2153 | !mls_level_eq(level, | |
2154 | &rule->au_ctxt.range.level[0])); | |
2155 | break; | |
2156 | case AUDIT_GREATER_THAN_OR_EQUAL: | |
2157 | match = mls_level_dom(level, | |
2158 | &rule->au_ctxt.range.level[0]); | |
2159 | break; | |
2160 | } | |
2161 | } | |
2162 | ||
2163 | out: | |
2164 | POLICY_RDUNLOCK; | |
2165 | return match; | |
2166 | } | |
2167 | ||
2168 | static int (*aurule_callback)(void) = NULL; | |
2169 | ||
2170 | static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid, | |
2171 | u16 class, u32 perms, u32 *retained) | |
2172 | { | |
2173 | int err = 0; | |
2174 | ||
2175 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
2176 | err = aurule_callback(); | |
2177 | return err; | |
2178 | } | |
2179 | ||
2180 | static int __init aurule_init(void) | |
2181 | { | |
2182 | int err; | |
2183 | ||
2184 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET, | |
2185 | SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0); | |
2186 | if (err) | |
2187 | panic("avc_add_callback() failed, error %d\n", err); | |
2188 | ||
2189 | return err; | |
2190 | } | |
2191 | __initcall(aurule_init); | |
2192 | ||
2193 | void selinux_audit_set_callback(int (*callback)(void)) | |
2194 | { | |
2195 | aurule_callback = callback; | |
2196 | } | |
7420ed23 | 2197 | |
3de4bab5 PM |
2198 | /** |
2199 | * security_skb_extlbl_sid - Determine the external label of a packet | |
2200 | * @skb: the packet | |
2201 | * @base_sid: the SELinux SID to use as a context for MLS only external labels | |
2202 | * @sid: the packet's SID | |
2203 | * | |
2204 | * Description: | |
2205 | * Check the various different forms of external packet labeling and determine | |
2206 | * the external SID for the packet. | |
2207 | * | |
2208 | */ | |
2209 | void security_skb_extlbl_sid(struct sk_buff *skb, u32 base_sid, u32 *sid) | |
2210 | { | |
2211 | u32 xfrm_sid; | |
2212 | u32 nlbl_sid; | |
2213 | ||
2214 | selinux_skb_xfrm_sid(skb, &xfrm_sid); | |
2215 | if (selinux_netlbl_skbuff_getsid(skb, | |
2216 | (xfrm_sid == SECSID_NULL ? | |
2217 | base_sid : xfrm_sid), | |
2218 | &nlbl_sid) != 0) | |
2219 | nlbl_sid = SECSID_NULL; | |
2220 | ||
2221 | *sid = (nlbl_sid == SECSID_NULL ? xfrm_sid : nlbl_sid); | |
2222 | } | |
2223 | ||
7420ed23 VY |
2224 | #ifdef CONFIG_NETLABEL |
2225 | /* | |
2226 | * This is the structure we store inside the NetLabel cache block. | |
2227 | */ | |
2228 | #define NETLBL_CACHE(x) ((struct netlbl_cache *)(x)) | |
2229 | #define NETLBL_CACHE_T_NONE 0 | |
2230 | #define NETLBL_CACHE_T_SID 1 | |
2231 | #define NETLBL_CACHE_T_MLS 2 | |
2232 | struct netlbl_cache { | |
2233 | u32 type; | |
2234 | union { | |
2235 | u32 sid; | |
2236 | struct mls_range mls_label; | |
2237 | } data; | |
2238 | }; | |
2239 | ||
2240 | /** | |
2241 | * selinux_netlbl_cache_free - Free the NetLabel cached data | |
2242 | * @data: the data to free | |
2243 | * | |
2244 | * Description: | |
2245 | * This function is intended to be used as the free() callback inside the | |
2246 | * netlbl_lsm_cache structure. | |
2247 | * | |
2248 | */ | |
2249 | static void selinux_netlbl_cache_free(const void *data) | |
2250 | { | |
ffb733c6 | 2251 | struct netlbl_cache *cache; |
2252 | ||
2253 | if (data == NULL) | |
2254 | return; | |
2255 | ||
2256 | cache = NETLBL_CACHE(data); | |
7420ed23 VY |
2257 | switch (cache->type) { |
2258 | case NETLBL_CACHE_T_MLS: | |
2259 | ebitmap_destroy(&cache->data.mls_label.level[0].cat); | |
2260 | break; | |
2261 | } | |
2262 | kfree(data); | |
2263 | } | |
2264 | ||
2265 | /** | |
2266 | * selinux_netlbl_cache_add - Add an entry to the NetLabel cache | |
2267 | * @skb: the packet | |
2268 | * @ctx: the SELinux context | |
2269 | * | |
2270 | * Description: | |
2271 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
2272 | * @skb, in the NetLabel subsystem cache. | |
2273 | * | |
2274 | */ | |
2275 | static void selinux_netlbl_cache_add(struct sk_buff *skb, struct context *ctx) | |
2276 | { | |
2277 | struct netlbl_cache *cache = NULL; | |
2278 | struct netlbl_lsm_secattr secattr; | |
2279 | ||
2280 | netlbl_secattr_init(&secattr); | |
ffb733c6 | 2281 | secattr.cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
2282 | if (secattr.cache == NULL) | |
2283 | goto netlbl_cache_add_return; | |
7420ed23 VY |
2284 | |
2285 | cache = kzalloc(sizeof(*cache), GFP_ATOMIC); | |
2286 | if (cache == NULL) | |
ffb733c6 | 2287 | goto netlbl_cache_add_return; |
7420ed23 VY |
2288 | |
2289 | cache->type = NETLBL_CACHE_T_MLS; | |
2290 | if (ebitmap_cpy(&cache->data.mls_label.level[0].cat, | |
2291 | &ctx->range.level[0].cat) != 0) | |
ffb733c6 | 2292 | goto netlbl_cache_add_return; |
7420ed23 VY |
2293 | cache->data.mls_label.level[1].cat.highbit = |
2294 | cache->data.mls_label.level[0].cat.highbit; | |
2295 | cache->data.mls_label.level[1].cat.node = | |
2296 | cache->data.mls_label.level[0].cat.node; | |
2297 | cache->data.mls_label.level[0].sens = ctx->range.level[0].sens; | |
2298 | cache->data.mls_label.level[1].sens = ctx->range.level[0].sens; | |
2299 | ||
701a90ba PM |
2300 | secattr.cache->free = selinux_netlbl_cache_free; |
2301 | secattr.cache->data = (void *)cache; | |
2302 | secattr.flags = NETLBL_SECATTR_CACHE; | |
2303 | ||
ffb733c6 | 2304 | netlbl_cache_add(skb, &secattr); |
7420ed23 | 2305 | |
ffb733c6 | 2306 | netlbl_cache_add_return: |
2307 | netlbl_secattr_destroy(&secattr); | |
7420ed23 VY |
2308 | } |
2309 | ||
2310 | /** | |
2311 | * selinux_netlbl_cache_invalidate - Invalidate the NetLabel cache | |
2312 | * | |
2313 | * Description: | |
2314 | * Invalidate the NetLabel security attribute mapping cache. | |
2315 | * | |
2316 | */ | |
2317 | void selinux_netlbl_cache_invalidate(void) | |
2318 | { | |
2319 | netlbl_cache_invalidate(); | |
2320 | } | |
2321 | ||
2322 | /** | |
2323 | * selinux_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID | |
2324 | * @skb: the network packet | |
2325 | * @secattr: the NetLabel packet security attributes | |
2326 | * @base_sid: the SELinux SID to use as a context for MLS only attributes | |
2327 | * @sid: the SELinux SID | |
2328 | * | |
2329 | * Description: | |
2330 | * Convert the given NetLabel packet security attributes in @secattr into a | |
2331 | * SELinux SID. If the @secattr field does not contain a full SELinux | |
2332 | * SID/context then use the context in @base_sid as the foundation. If @skb | |
2333 | * is not NULL attempt to cache as much data as possibile. Returns zero on | |
2334 | * success, negative values on failure. | |
2335 | * | |
2336 | */ | |
2337 | static int selinux_netlbl_secattr_to_sid(struct sk_buff *skb, | |
2338 | struct netlbl_lsm_secattr *secattr, | |
2339 | u32 base_sid, | |
2340 | u32 *sid) | |
2341 | { | |
2342 | int rc = -EIDRM; | |
2343 | struct context *ctx; | |
2344 | struct context ctx_new; | |
2345 | struct netlbl_cache *cache; | |
2346 | ||
2347 | POLICY_RDLOCK; | |
2348 | ||
701a90ba | 2349 | if (secattr->flags & NETLBL_SECATTR_CACHE) { |
ffb733c6 | 2350 | cache = NETLBL_CACHE(secattr->cache->data); |
7420ed23 VY |
2351 | switch (cache->type) { |
2352 | case NETLBL_CACHE_T_SID: | |
2353 | *sid = cache->data.sid; | |
2354 | rc = 0; | |
2355 | break; | |
2356 | case NETLBL_CACHE_T_MLS: | |
2357 | ctx = sidtab_search(&sidtab, base_sid); | |
2358 | if (ctx == NULL) | |
2359 | goto netlbl_secattr_to_sid_return; | |
2360 | ||
2361 | ctx_new.user = ctx->user; | |
2362 | ctx_new.role = ctx->role; | |
2363 | ctx_new.type = ctx->type; | |
2364 | ctx_new.range.level[0].sens = | |
2365 | cache->data.mls_label.level[0].sens; | |
2366 | ctx_new.range.level[0].cat.highbit = | |
2367 | cache->data.mls_label.level[0].cat.highbit; | |
2368 | ctx_new.range.level[0].cat.node = | |
2369 | cache->data.mls_label.level[0].cat.node; | |
2370 | ctx_new.range.level[1].sens = | |
2371 | cache->data.mls_label.level[1].sens; | |
2372 | ctx_new.range.level[1].cat.highbit = | |
2373 | cache->data.mls_label.level[1].cat.highbit; | |
2374 | ctx_new.range.level[1].cat.node = | |
2375 | cache->data.mls_label.level[1].cat.node; | |
2376 | ||
2377 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
2378 | break; | |
2379 | default: | |
2380 | goto netlbl_secattr_to_sid_return; | |
2381 | } | |
701a90ba | 2382 | } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
7420ed23 VY |
2383 | ctx = sidtab_search(&sidtab, base_sid); |
2384 | if (ctx == NULL) | |
2385 | goto netlbl_secattr_to_sid_return; | |
2386 | ||
2387 | ctx_new.user = ctx->user; | |
2388 | ctx_new.role = ctx->role; | |
2389 | ctx_new.type = ctx->type; | |
02752760 | 2390 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 2391 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
02752760 PM |
2392 | if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat, |
2393 | secattr->mls_cat) != 0) | |
7420ed23 VY |
2394 | goto netlbl_secattr_to_sid_return; |
2395 | ctx_new.range.level[1].cat.highbit = | |
2396 | ctx_new.range.level[0].cat.highbit; | |
2397 | ctx_new.range.level[1].cat.node = | |
2398 | ctx_new.range.level[0].cat.node; | |
2399 | } else { | |
2400 | ebitmap_init(&ctx_new.range.level[0].cat); | |
2401 | ebitmap_init(&ctx_new.range.level[1].cat); | |
2402 | } | |
2403 | if (mls_context_isvalid(&policydb, &ctx_new) != 1) | |
2404 | goto netlbl_secattr_to_sid_return_cleanup; | |
2405 | ||
2406 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
2407 | if (rc != 0) | |
2408 | goto netlbl_secattr_to_sid_return_cleanup; | |
2409 | ||
2410 | if (skb != NULL) | |
2411 | selinux_netlbl_cache_add(skb, &ctx_new); | |
2412 | ebitmap_destroy(&ctx_new.range.level[0].cat); | |
2413 | } else { | |
388b2405 | 2414 | *sid = SECSID_NULL; |
7420ed23 VY |
2415 | rc = 0; |
2416 | } | |
2417 | ||
2418 | netlbl_secattr_to_sid_return: | |
2419 | POLICY_RDUNLOCK; | |
2420 | return rc; | |
2421 | netlbl_secattr_to_sid_return_cleanup: | |
2422 | ebitmap_destroy(&ctx_new.range.level[0].cat); | |
2423 | goto netlbl_secattr_to_sid_return; | |
2424 | } | |
2425 | ||
2426 | /** | |
2427 | * selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel | |
2428 | * @skb: the packet | |
2429 | * @base_sid: the SELinux SID to use as a context for MLS only attributes | |
2430 | * @sid: the SID | |
2431 | * | |
2432 | * Description: | |
2433 | * Call the NetLabel mechanism to get the security attributes of the given | |
2434 | * packet and use those attributes to determine the correct context/SID to | |
2435 | * assign to the packet. Returns zero on success, negative values on failure. | |
2436 | * | |
2437 | */ | |
3de4bab5 | 2438 | int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, u32 *sid) |
7420ed23 VY |
2439 | { |
2440 | int rc; | |
2441 | struct netlbl_lsm_secattr secattr; | |
2442 | ||
2443 | netlbl_secattr_init(&secattr); | |
2444 | rc = netlbl_skbuff_getattr(skb, &secattr); | |
701a90ba | 2445 | if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) |
7420ed23 VY |
2446 | rc = selinux_netlbl_secattr_to_sid(skb, |
2447 | &secattr, | |
2448 | base_sid, | |
2449 | sid); | |
701a90ba PM |
2450 | else |
2451 | *sid = SECSID_NULL; | |
ffb733c6 | 2452 | netlbl_secattr_destroy(&secattr); |
7420ed23 VY |
2453 | |
2454 | return rc; | |
2455 | } | |
2456 | ||
2457 | /** | |
2458 | * selinux_netlbl_socket_setsid - Label a socket using the NetLabel mechanism | |
2459 | * @sock: the socket to label | |
2460 | * @sid: the SID to use | |
2461 | * | |
2462 | * Description: | |
2463 | * Attempt to label a socket using the NetLabel mechanism using the given | |
9f2ad665 PM |
2464 | * SID. Returns zero values on success, negative values on failure. The |
2465 | * caller is responsibile for calling rcu_read_lock() before calling this | |
2466 | * this function and rcu_read_unlock() after this function returns. | |
7420ed23 VY |
2467 | * |
2468 | */ | |
2469 | static int selinux_netlbl_socket_setsid(struct socket *sock, u32 sid) | |
2470 | { | |
2471 | int rc = -ENOENT; | |
2472 | struct sk_security_struct *sksec = sock->sk->sk_security; | |
2473 | struct netlbl_lsm_secattr secattr; | |
2474 | struct context *ctx; | |
2475 | ||
2476 | if (!ss_initialized) | |
2477 | return 0; | |
2478 | ||
bf0edf39 PM |
2479 | netlbl_secattr_init(&secattr); |
2480 | ||
7420ed23 VY |
2481 | POLICY_RDLOCK; |
2482 | ||
2483 | ctx = sidtab_search(&sidtab, sid); | |
2484 | if (ctx == NULL) | |
2485 | goto netlbl_socket_setsid_return; | |
2486 | ||
7420ed23 VY |
2487 | secattr.domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], |
2488 | GFP_ATOMIC); | |
02752760 PM |
2489 | secattr.flags |= NETLBL_SECATTR_DOMAIN; |
2490 | mls_export_netlbl_lvl(ctx, &secattr); | |
2491 | rc = mls_export_netlbl_cat(ctx, &secattr); | |
bf0edf39 PM |
2492 | if (rc != 0) |
2493 | goto netlbl_socket_setsid_return; | |
7420ed23 VY |
2494 | |
2495 | rc = netlbl_socket_setattr(sock, &secattr); | |
9f2ad665 | 2496 | if (rc == 0) { |
79795120 | 2497 | spin_lock_bh(&sksec->nlbl_lock); |
7420ed23 | 2498 | sksec->nlbl_state = NLBL_LABELED; |
79795120 | 2499 | spin_unlock_bh(&sksec->nlbl_lock); |
9f2ad665 | 2500 | } |
7420ed23 | 2501 | |
7420ed23 VY |
2502 | netlbl_socket_setsid_return: |
2503 | POLICY_RDUNLOCK; | |
bf0edf39 | 2504 | netlbl_secattr_destroy(&secattr); |
7420ed23 VY |
2505 | return rc; |
2506 | } | |
2507 | ||
9f2ad665 PM |
2508 | /** |
2509 | * selinux_netlbl_sk_security_reset - Reset the NetLabel fields | |
2510 | * @ssec: the sk_security_struct | |
2511 | * @family: the socket family | |
2512 | * | |
2513 | * Description: | |
2514 | * Called when the NetLabel state of a sk_security_struct needs to be reset. | |
2515 | * The caller is responsibile for all the NetLabel sk_security_struct locking. | |
2516 | * | |
2517 | */ | |
2518 | void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec, | |
2519 | int family) | |
2520 | { | |
2521 | if (family == PF_INET) | |
2522 | ssec->nlbl_state = NLBL_REQUIRE; | |
2523 | else | |
2524 | ssec->nlbl_state = NLBL_UNSET; | |
2525 | } | |
2526 | ||
99f59ed0 PM |
2527 | /** |
2528 | * selinux_netlbl_sk_security_init - Setup the NetLabel fields | |
2529 | * @ssec: the sk_security_struct | |
2530 | * @family: the socket family | |
2531 | * | |
2532 | * Description: | |
2533 | * Called when a new sk_security_struct is allocated to initialize the NetLabel | |
2534 | * fields. | |
2535 | * | |
2536 | */ | |
2537 | void selinux_netlbl_sk_security_init(struct sk_security_struct *ssec, | |
2538 | int family) | |
2539 | { | |
9f2ad665 PM |
2540 | /* No locking needed, we are the only one who has access to ssec */ |
2541 | selinux_netlbl_sk_security_reset(ssec, family); | |
2542 | spin_lock_init(&ssec->nlbl_lock); | |
99f59ed0 PM |
2543 | } |
2544 | ||
2545 | /** | |
9f2ad665 | 2546 | * selinux_netlbl_sk_security_clone - Copy the NetLabel fields |
99f59ed0 PM |
2547 | * @ssec: the original sk_security_struct |
2548 | * @newssec: the cloned sk_security_struct | |
2549 | * | |
2550 | * Description: | |
2551 | * Clone the NetLabel specific sk_security_struct fields from @ssec to | |
2552 | * @newssec. | |
2553 | * | |
2554 | */ | |
9f2ad665 | 2555 | void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec, |
99f59ed0 PM |
2556 | struct sk_security_struct *newssec) |
2557 | { | |
9f2ad665 PM |
2558 | /* We don't need to take newssec->nlbl_lock because we are the only |
2559 | * thread with access to newssec, but we do need to take the RCU read | |
2560 | * lock as other threads could have access to ssec */ | |
2561 | rcu_read_lock(); | |
2562 | selinux_netlbl_sk_security_reset(newssec, ssec->sk->sk_family); | |
99f59ed0 | 2563 | newssec->sclass = ssec->sclass; |
9f2ad665 | 2564 | rcu_read_unlock(); |
99f59ed0 PM |
2565 | } |
2566 | ||
7420ed23 VY |
2567 | /** |
2568 | * selinux_netlbl_socket_post_create - Label a socket using NetLabel | |
2569 | * @sock: the socket to label | |
7420ed23 VY |
2570 | * |
2571 | * Description: | |
2572 | * Attempt to label a socket using the NetLabel mechanism using the given | |
2573 | * SID. Returns zero values on success, negative values on failure. | |
2574 | * | |
2575 | */ | |
9f2ad665 | 2576 | int selinux_netlbl_socket_post_create(struct socket *sock) |
7420ed23 | 2577 | { |
9f2ad665 | 2578 | int rc = 0; |
7420ed23 VY |
2579 | struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; |
2580 | struct sk_security_struct *sksec = sock->sk->sk_security; | |
2581 | ||
99f59ed0 PM |
2582 | sksec->sclass = isec->sclass; |
2583 | ||
9f2ad665 PM |
2584 | rcu_read_lock(); |
2585 | if (sksec->nlbl_state == NLBL_REQUIRE) | |
2586 | rc = selinux_netlbl_socket_setsid(sock, sksec->sid); | |
2587 | rcu_read_unlock(); | |
7420ed23 | 2588 | |
9f2ad665 | 2589 | return rc; |
7420ed23 VY |
2590 | } |
2591 | ||
2592 | /** | |
2593 | * selinux_netlbl_sock_graft - Netlabel the new socket | |
2594 | * @sk: the new connection | |
2595 | * @sock: the new socket | |
2596 | * | |
2597 | * Description: | |
2598 | * The connection represented by @sk is being grafted onto @sock so set the | |
2599 | * socket's NetLabel to match the SID of @sk. | |
2600 | * | |
2601 | */ | |
2602 | void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock) | |
2603 | { | |
2604 | struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; | |
2605 | struct sk_security_struct *sksec = sk->sk_security; | |
14a72f53 PM |
2606 | struct netlbl_lsm_secattr secattr; |
2607 | u32 nlbl_peer_sid; | |
7420ed23 | 2608 | |
99f59ed0 PM |
2609 | sksec->sclass = isec->sclass; |
2610 | ||
9f2ad665 PM |
2611 | rcu_read_lock(); |
2612 | ||
2613 | if (sksec->nlbl_state != NLBL_REQUIRE) { | |
2614 | rcu_read_unlock(); | |
7420ed23 | 2615 | return; |
9f2ad665 | 2616 | } |
7420ed23 | 2617 | |
14a72f53 PM |
2618 | netlbl_secattr_init(&secattr); |
2619 | if (netlbl_sock_getattr(sk, &secattr) == 0 && | |
701a90ba | 2620 | secattr.flags != NETLBL_SECATTR_NONE && |
14a72f53 PM |
2621 | selinux_netlbl_secattr_to_sid(NULL, |
2622 | &secattr, | |
388b2405 | 2623 | SECINITSID_UNLABELED, |
14a72f53 PM |
2624 | &nlbl_peer_sid) == 0) |
2625 | sksec->peer_sid = nlbl_peer_sid; | |
ffb733c6 | 2626 | netlbl_secattr_destroy(&secattr); |
14a72f53 | 2627 | |
7420ed23 VY |
2628 | /* Try to set the NetLabel on the socket to save time later, if we fail |
2629 | * here we will pick up the pieces in later calls to | |
2630 | * selinux_netlbl_inode_permission(). */ | |
2631 | selinux_netlbl_socket_setsid(sock, sksec->sid); | |
9f2ad665 PM |
2632 | |
2633 | rcu_read_unlock(); | |
7420ed23 VY |
2634 | } |
2635 | ||
7420ed23 | 2636 | /** |
e448e931 | 2637 | * selinux_netlbl_inode_permission - Verify the socket is NetLabel labeled |
7420ed23 VY |
2638 | * @inode: the file descriptor's inode |
2639 | * @mask: the permission mask | |
2640 | * | |
2641 | * Description: | |
e448e931 PM |
2642 | * Looks at a file's inode and if it is marked as a socket protected by |
2643 | * NetLabel then verify that the socket has been labeled, if not try to label | |
2644 | * the socket now with the inode's SID. Returns zero on success, negative | |
2645 | * values on failure. | |
7420ed23 VY |
2646 | * |
2647 | */ | |
e448e931 | 2648 | int selinux_netlbl_inode_permission(struct inode *inode, int mask) |
7420ed23 VY |
2649 | { |
2650 | int rc; | |
e448e931 PM |
2651 | struct sk_security_struct *sksec; |
2652 | struct socket *sock; | |
7420ed23 | 2653 | |
9f2ad665 PM |
2654 | if (!S_ISSOCK(inode->i_mode) || |
2655 | ((mask & (MAY_WRITE | MAY_APPEND)) == 0)) | |
e448e931 | 2656 | return 0; |
e448e931 | 2657 | sock = SOCKET_I(inode); |
e448e931 | 2658 | sksec = sock->sk->sk_security; |
9f2ad665 PM |
2659 | |
2660 | rcu_read_lock(); | |
2661 | if (sksec->nlbl_state != NLBL_REQUIRE) { | |
2662 | rcu_read_unlock(); | |
2663 | return 0; | |
2664 | } | |
9883a13c PW |
2665 | local_bh_disable(); |
2666 | bh_lock_sock_nested(sock->sk); | |
9f2ad665 | 2667 | rc = selinux_netlbl_socket_setsid(sock, sksec->sid); |
9883a13c PW |
2668 | bh_unlock_sock(sock->sk); |
2669 | local_bh_enable(); | |
9f2ad665 | 2670 | rcu_read_unlock(); |
7420ed23 VY |
2671 | |
2672 | return rc; | |
2673 | } | |
2674 | ||
2675 | /** | |
2676 | * selinux_netlbl_sock_rcv_skb - Do an inbound access check using NetLabel | |
2677 | * @sksec: the sock's sk_security_struct | |
2678 | * @skb: the packet | |
2679 | * @ad: the audit data | |
2680 | * | |
2681 | * Description: | |
2682 | * Fetch the NetLabel security attributes from @skb and perform an access check | |
2683 | * against the receiving socket. Returns zero on success, negative values on | |
2684 | * error. | |
2685 | * | |
2686 | */ | |
2687 | int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec, | |
2688 | struct sk_buff *skb, | |
2689 | struct avc_audit_data *ad) | |
2690 | { | |
2691 | int rc; | |
2692 | u32 netlbl_sid; | |
2693 | u32 recv_perm; | |
2694 | ||
388b2405 | 2695 | rc = selinux_netlbl_skbuff_getsid(skb, |
2696 | SECINITSID_UNLABELED, | |
2697 | &netlbl_sid); | |
7420ed23 VY |
2698 | if (rc != 0) |
2699 | return rc; | |
2700 | ||
388b2405 | 2701 | if (netlbl_sid == SECSID_NULL) |
7420ed23 VY |
2702 | return 0; |
2703 | ||
2704 | switch (sksec->sclass) { | |
2705 | case SECCLASS_UDP_SOCKET: | |
df2115c3 | 2706 | recv_perm = UDP_SOCKET__RECVFROM; |
7420ed23 VY |
2707 | break; |
2708 | case SECCLASS_TCP_SOCKET: | |
df2115c3 | 2709 | recv_perm = TCP_SOCKET__RECVFROM; |
7420ed23 VY |
2710 | break; |
2711 | default: | |
df2115c3 | 2712 | recv_perm = RAWIP_SOCKET__RECVFROM; |
7420ed23 VY |
2713 | } |
2714 | ||
2715 | rc = avc_has_perm(sksec->sid, | |
2716 | netlbl_sid, | |
2717 | sksec->sclass, | |
2718 | recv_perm, | |
2719 | ad); | |
2720 | if (rc == 0) | |
2721 | return 0; | |
2722 | ||
2723 | netlbl_skbuff_err(skb, rc); | |
2724 | return rc; | |
2725 | } | |
2726 | ||
f8687afe PM |
2727 | /** |
2728 | * selinux_netlbl_socket_setsockopt - Do not allow users to remove a NetLabel | |
2729 | * @sock: the socket | |
2730 | * @level: the socket level or protocol | |
2731 | * @optname: the socket option name | |
2732 | * | |
2733 | * Description: | |
2734 | * Check the setsockopt() call and if the user is trying to replace the IP | |
2735 | * options on a socket and a NetLabel is in place for the socket deny the | |
2736 | * access; otherwise allow the access. Returns zero when the access is | |
2737 | * allowed, -EACCES when denied, and other negative values on error. | |
2738 | * | |
2739 | */ | |
2740 | int selinux_netlbl_socket_setsockopt(struct socket *sock, | |
2741 | int level, | |
2742 | int optname) | |
2743 | { | |
2744 | int rc = 0; | |
f8687afe | 2745 | struct sk_security_struct *sksec = sock->sk->sk_security; |
f8687afe PM |
2746 | struct netlbl_lsm_secattr secattr; |
2747 | ||
9f2ad665 | 2748 | rcu_read_lock(); |
f8687afe PM |
2749 | if (level == IPPROTO_IP && optname == IP_OPTIONS && |
2750 | sksec->nlbl_state == NLBL_LABELED) { | |
2751 | netlbl_secattr_init(&secattr); | |
2752 | rc = netlbl_socket_getattr(sock, &secattr); | |
701a90ba | 2753 | if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) |
f8687afe PM |
2754 | rc = -EACCES; |
2755 | netlbl_secattr_destroy(&secattr); | |
2756 | } | |
9f2ad665 | 2757 | rcu_read_unlock(); |
f8687afe PM |
2758 | |
2759 | return rc; | |
2760 | } | |
7420ed23 | 2761 | #endif /* CONFIG_NETLABEL */ |