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 | * | |
376bd9cb | 16 | * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. |
1da177e4 LT |
17 | * Copyright (C) 2003 - 2004 Tresys Technology, LLC |
18 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> | |
19 | * This program is free software; you can redistribute it and/or modify | |
20 | * it under the terms of the GNU General Public License as published by | |
21 | * the Free Software Foundation, version 2. | |
22 | */ | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/spinlock.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/in.h> | |
29 | #include <linux/sched.h> | |
30 | #include <linux/audit.h> | |
bb003079 IM |
31 | #include <linux/mutex.h> |
32 | ||
1da177e4 LT |
33 | #include "flask.h" |
34 | #include "avc.h" | |
35 | #include "avc_ss.h" | |
36 | #include "security.h" | |
37 | #include "context.h" | |
38 | #include "policydb.h" | |
39 | #include "sidtab.h" | |
40 | #include "services.h" | |
41 | #include "conditional.h" | |
42 | #include "mls.h" | |
43 | ||
44 | extern void selnl_notify_policyload(u32 seqno); | |
45 | unsigned int policydb_loaded_version; | |
46 | ||
47 | static DEFINE_RWLOCK(policy_rwlock); | |
48 | #define POLICY_RDLOCK read_lock(&policy_rwlock) | |
49 | #define POLICY_WRLOCK write_lock_irq(&policy_rwlock) | |
50 | #define POLICY_RDUNLOCK read_unlock(&policy_rwlock) | |
51 | #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock) | |
52 | ||
bb003079 IM |
53 | static DEFINE_MUTEX(load_mutex); |
54 | #define LOAD_LOCK mutex_lock(&load_mutex) | |
55 | #define LOAD_UNLOCK mutex_unlock(&load_mutex) | |
1da177e4 LT |
56 | |
57 | static struct sidtab sidtab; | |
58 | struct policydb policydb; | |
59 | int ss_initialized = 0; | |
60 | ||
61 | /* | |
62 | * The largest sequence number that has been used when | |
63 | * providing an access decision to the access vector cache. | |
64 | * The sequence number only changes when a policy change | |
65 | * occurs. | |
66 | */ | |
67 | static u32 latest_granting = 0; | |
68 | ||
69 | /* Forward declaration. */ | |
70 | static int context_struct_to_string(struct context *context, char **scontext, | |
71 | u32 *scontext_len); | |
72 | ||
73 | /* | |
74 | * Return the boolean value of a constraint expression | |
75 | * when it is applied to the specified source and target | |
76 | * security contexts. | |
77 | * | |
78 | * xcontext is a special beast... It is used by the validatetrans rules | |
79 | * only. For these rules, scontext is the context before the transition, | |
80 | * tcontext is the context after the transition, and xcontext is the context | |
81 | * of the process performing the transition. All other callers of | |
82 | * constraint_expr_eval should pass in NULL for xcontext. | |
83 | */ | |
84 | static int constraint_expr_eval(struct context *scontext, | |
85 | struct context *tcontext, | |
86 | struct context *xcontext, | |
87 | struct constraint_expr *cexpr) | |
88 | { | |
89 | u32 val1, val2; | |
90 | struct context *c; | |
91 | struct role_datum *r1, *r2; | |
92 | struct mls_level *l1, *l2; | |
93 | struct constraint_expr *e; | |
94 | int s[CEXPR_MAXDEPTH]; | |
95 | int sp = -1; | |
96 | ||
97 | for (e = cexpr; e; e = e->next) { | |
98 | switch (e->expr_type) { | |
99 | case CEXPR_NOT: | |
100 | BUG_ON(sp < 0); | |
101 | s[sp] = !s[sp]; | |
102 | break; | |
103 | case CEXPR_AND: | |
104 | BUG_ON(sp < 1); | |
105 | sp--; | |
106 | s[sp] &= s[sp+1]; | |
107 | break; | |
108 | case CEXPR_OR: | |
109 | BUG_ON(sp < 1); | |
110 | sp--; | |
111 | s[sp] |= s[sp+1]; | |
112 | break; | |
113 | case CEXPR_ATTR: | |
114 | if (sp == (CEXPR_MAXDEPTH-1)) | |
115 | return 0; | |
116 | switch (e->attr) { | |
117 | case CEXPR_USER: | |
118 | val1 = scontext->user; | |
119 | val2 = tcontext->user; | |
120 | break; | |
121 | case CEXPR_TYPE: | |
122 | val1 = scontext->type; | |
123 | val2 = tcontext->type; | |
124 | break; | |
125 | case CEXPR_ROLE: | |
126 | val1 = scontext->role; | |
127 | val2 = tcontext->role; | |
128 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
129 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
130 | switch (e->op) { | |
131 | case CEXPR_DOM: | |
132 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
133 | val2 - 1); | |
134 | continue; | |
135 | case CEXPR_DOMBY: | |
136 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
137 | val1 - 1); | |
138 | continue; | |
139 | case CEXPR_INCOMP: | |
140 | s[++sp] = ( !ebitmap_get_bit(&r1->dominates, | |
141 | val2 - 1) && | |
142 | !ebitmap_get_bit(&r2->dominates, | |
143 | val1 - 1) ); | |
144 | continue; | |
145 | default: | |
146 | break; | |
147 | } | |
148 | break; | |
149 | case CEXPR_L1L2: | |
150 | l1 = &(scontext->range.level[0]); | |
151 | l2 = &(tcontext->range.level[0]); | |
152 | goto mls_ops; | |
153 | case CEXPR_L1H2: | |
154 | l1 = &(scontext->range.level[0]); | |
155 | l2 = &(tcontext->range.level[1]); | |
156 | goto mls_ops; | |
157 | case CEXPR_H1L2: | |
158 | l1 = &(scontext->range.level[1]); | |
159 | l2 = &(tcontext->range.level[0]); | |
160 | goto mls_ops; | |
161 | case CEXPR_H1H2: | |
162 | l1 = &(scontext->range.level[1]); | |
163 | l2 = &(tcontext->range.level[1]); | |
164 | goto mls_ops; | |
165 | case CEXPR_L1H1: | |
166 | l1 = &(scontext->range.level[0]); | |
167 | l2 = &(scontext->range.level[1]); | |
168 | goto mls_ops; | |
169 | case CEXPR_L2H2: | |
170 | l1 = &(tcontext->range.level[0]); | |
171 | l2 = &(tcontext->range.level[1]); | |
172 | goto mls_ops; | |
173 | mls_ops: | |
174 | switch (e->op) { | |
175 | case CEXPR_EQ: | |
176 | s[++sp] = mls_level_eq(l1, l2); | |
177 | continue; | |
178 | case CEXPR_NEQ: | |
179 | s[++sp] = !mls_level_eq(l1, l2); | |
180 | continue; | |
181 | case CEXPR_DOM: | |
182 | s[++sp] = mls_level_dom(l1, l2); | |
183 | continue; | |
184 | case CEXPR_DOMBY: | |
185 | s[++sp] = mls_level_dom(l2, l1); | |
186 | continue; | |
187 | case CEXPR_INCOMP: | |
188 | s[++sp] = mls_level_incomp(l2, l1); | |
189 | continue; | |
190 | default: | |
191 | BUG(); | |
192 | return 0; | |
193 | } | |
194 | break; | |
195 | default: | |
196 | BUG(); | |
197 | return 0; | |
198 | } | |
199 | ||
200 | switch (e->op) { | |
201 | case CEXPR_EQ: | |
202 | s[++sp] = (val1 == val2); | |
203 | break; | |
204 | case CEXPR_NEQ: | |
205 | s[++sp] = (val1 != val2); | |
206 | break; | |
207 | default: | |
208 | BUG(); | |
209 | return 0; | |
210 | } | |
211 | break; | |
212 | case CEXPR_NAMES: | |
213 | if (sp == (CEXPR_MAXDEPTH-1)) | |
214 | return 0; | |
215 | c = scontext; | |
216 | if (e->attr & CEXPR_TARGET) | |
217 | c = tcontext; | |
218 | else if (e->attr & CEXPR_XTARGET) { | |
219 | c = xcontext; | |
220 | if (!c) { | |
221 | BUG(); | |
222 | return 0; | |
223 | } | |
224 | } | |
225 | if (e->attr & CEXPR_USER) | |
226 | val1 = c->user; | |
227 | else if (e->attr & CEXPR_ROLE) | |
228 | val1 = c->role; | |
229 | else if (e->attr & CEXPR_TYPE) | |
230 | val1 = c->type; | |
231 | else { | |
232 | BUG(); | |
233 | return 0; | |
234 | } | |
235 | ||
236 | switch (e->op) { | |
237 | case CEXPR_EQ: | |
238 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
239 | break; | |
240 | case CEXPR_NEQ: | |
241 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
242 | break; | |
243 | default: | |
244 | BUG(); | |
245 | return 0; | |
246 | } | |
247 | break; | |
248 | default: | |
249 | BUG(); | |
250 | return 0; | |
251 | } | |
252 | } | |
253 | ||
254 | BUG_ON(sp != 0); | |
255 | return s[0]; | |
256 | } | |
257 | ||
258 | /* | |
259 | * Compute access vectors based on a context structure pair for | |
260 | * the permissions in a particular class. | |
261 | */ | |
262 | static int context_struct_compute_av(struct context *scontext, | |
263 | struct context *tcontext, | |
264 | u16 tclass, | |
265 | u32 requested, | |
266 | struct av_decision *avd) | |
267 | { | |
268 | struct constraint_node *constraint; | |
269 | struct role_allow *ra; | |
270 | struct avtab_key avkey; | |
782ebb99 | 271 | struct avtab_node *node; |
1da177e4 | 272 | struct class_datum *tclass_datum; |
782ebb99 SS |
273 | struct ebitmap *sattr, *tattr; |
274 | struct ebitmap_node *snode, *tnode; | |
275 | unsigned int i, j; | |
1da177e4 LT |
276 | |
277 | /* | |
278 | * Remap extended Netlink classes for old policy versions. | |
279 | * Do this here rather than socket_type_to_security_class() | |
280 | * in case a newer policy version is loaded, allowing sockets | |
281 | * to remain in the correct class. | |
282 | */ | |
283 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
284 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
285 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
286 | tclass = SECCLASS_NETLINK_SOCKET; | |
287 | ||
288 | if (!tclass || tclass > policydb.p_classes.nprim) { | |
289 | printk(KERN_ERR "security_compute_av: unrecognized class %d\n", | |
290 | tclass); | |
291 | return -EINVAL; | |
292 | } | |
293 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
294 | ||
295 | /* | |
296 | * Initialize the access vectors to the default values. | |
297 | */ | |
298 | avd->allowed = 0; | |
299 | avd->decided = 0xffffffff; | |
300 | avd->auditallow = 0; | |
301 | avd->auditdeny = 0xffffffff; | |
302 | avd->seqno = latest_granting; | |
303 | ||
304 | /* | |
305 | * If a specific type enforcement rule was defined for | |
306 | * this permission check, then use it. | |
307 | */ | |
1da177e4 | 308 | avkey.target_class = tclass; |
782ebb99 SS |
309 | avkey.specified = AVTAB_AV; |
310 | sattr = &policydb.type_attr_map[scontext->type - 1]; | |
311 | tattr = &policydb.type_attr_map[tcontext->type - 1]; | |
312 | ebitmap_for_each_bit(sattr, snode, i) { | |
313 | if (!ebitmap_node_get_bit(snode, i)) | |
314 | continue; | |
315 | ebitmap_for_each_bit(tattr, tnode, j) { | |
316 | if (!ebitmap_node_get_bit(tnode, j)) | |
317 | continue; | |
318 | avkey.source_type = i + 1; | |
319 | avkey.target_type = j + 1; | |
320 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
321 | node != NULL; | |
322 | node = avtab_search_node_next(node, avkey.specified)) { | |
323 | if (node->key.specified == AVTAB_ALLOWED) | |
324 | avd->allowed |= node->datum.data; | |
325 | else if (node->key.specified == AVTAB_AUDITALLOW) | |
326 | avd->auditallow |= node->datum.data; | |
327 | else if (node->key.specified == AVTAB_AUDITDENY) | |
328 | avd->auditdeny &= node->datum.data; | |
329 | } | |
1da177e4 | 330 | |
782ebb99 SS |
331 | /* Check conditional av table for additional permissions */ |
332 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); | |
333 | ||
334 | } | |
335 | } | |
1da177e4 LT |
336 | |
337 | /* | |
338 | * Remove any permissions prohibited by a constraint (this includes | |
339 | * the MLS policy). | |
340 | */ | |
341 | constraint = tclass_datum->constraints; | |
342 | while (constraint) { | |
343 | if ((constraint->permissions & (avd->allowed)) && | |
344 | !constraint_expr_eval(scontext, tcontext, NULL, | |
345 | constraint->expr)) { | |
346 | avd->allowed = (avd->allowed) & ~(constraint->permissions); | |
347 | } | |
348 | constraint = constraint->next; | |
349 | } | |
350 | ||
351 | /* | |
352 | * If checking process transition permission and the | |
353 | * role is changing, then check the (current_role, new_role) | |
354 | * pair. | |
355 | */ | |
356 | if (tclass == SECCLASS_PROCESS && | |
357 | (avd->allowed & (PROCESS__TRANSITION | PROCESS__DYNTRANSITION)) && | |
358 | scontext->role != tcontext->role) { | |
359 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
360 | if (scontext->role == ra->role && | |
361 | tcontext->role == ra->new_role) | |
362 | break; | |
363 | } | |
364 | if (!ra) | |
365 | avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION | | |
366 | PROCESS__DYNTRANSITION); | |
367 | } | |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
372 | static int security_validtrans_handle_fail(struct context *ocontext, | |
373 | struct context *ncontext, | |
374 | struct context *tcontext, | |
375 | u16 tclass) | |
376 | { | |
377 | char *o = NULL, *n = NULL, *t = NULL; | |
378 | u32 olen, nlen, tlen; | |
379 | ||
380 | if (context_struct_to_string(ocontext, &o, &olen) < 0) | |
381 | goto out; | |
382 | if (context_struct_to_string(ncontext, &n, &nlen) < 0) | |
383 | goto out; | |
384 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
385 | goto out; | |
9ad9ad38 | 386 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
387 | "security_validate_transition: denied for" |
388 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", | |
389 | o, n, t, policydb.p_class_val_to_name[tclass-1]); | |
390 | out: | |
391 | kfree(o); | |
392 | kfree(n); | |
393 | kfree(t); | |
394 | ||
395 | if (!selinux_enforcing) | |
396 | return 0; | |
397 | return -EPERM; | |
398 | } | |
399 | ||
400 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
401 | u16 tclass) | |
402 | { | |
403 | struct context *ocontext; | |
404 | struct context *ncontext; | |
405 | struct context *tcontext; | |
406 | struct class_datum *tclass_datum; | |
407 | struct constraint_node *constraint; | |
408 | int rc = 0; | |
409 | ||
410 | if (!ss_initialized) | |
411 | return 0; | |
412 | ||
413 | POLICY_RDLOCK; | |
414 | ||
415 | /* | |
416 | * Remap extended Netlink classes for old policy versions. | |
417 | * Do this here rather than socket_type_to_security_class() | |
418 | * in case a newer policy version is loaded, allowing sockets | |
419 | * to remain in the correct class. | |
420 | */ | |
421 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
422 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
423 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
424 | tclass = SECCLASS_NETLINK_SOCKET; | |
425 | ||
426 | if (!tclass || tclass > policydb.p_classes.nprim) { | |
427 | printk(KERN_ERR "security_validate_transition: " | |
428 | "unrecognized class %d\n", tclass); | |
429 | rc = -EINVAL; | |
430 | goto out; | |
431 | } | |
432 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
433 | ||
434 | ocontext = sidtab_search(&sidtab, oldsid); | |
435 | if (!ocontext) { | |
436 | printk(KERN_ERR "security_validate_transition: " | |
437 | " unrecognized SID %d\n", oldsid); | |
438 | rc = -EINVAL; | |
439 | goto out; | |
440 | } | |
441 | ||
442 | ncontext = sidtab_search(&sidtab, newsid); | |
443 | if (!ncontext) { | |
444 | printk(KERN_ERR "security_validate_transition: " | |
445 | " unrecognized SID %d\n", newsid); | |
446 | rc = -EINVAL; | |
447 | goto out; | |
448 | } | |
449 | ||
450 | tcontext = sidtab_search(&sidtab, tasksid); | |
451 | if (!tcontext) { | |
452 | printk(KERN_ERR "security_validate_transition: " | |
453 | " unrecognized SID %d\n", tasksid); | |
454 | rc = -EINVAL; | |
455 | goto out; | |
456 | } | |
457 | ||
458 | constraint = tclass_datum->validatetrans; | |
459 | while (constraint) { | |
460 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
461 | constraint->expr)) { | |
462 | rc = security_validtrans_handle_fail(ocontext, ncontext, | |
463 | tcontext, tclass); | |
464 | goto out; | |
465 | } | |
466 | constraint = constraint->next; | |
467 | } | |
468 | ||
469 | out: | |
470 | POLICY_RDUNLOCK; | |
471 | return rc; | |
472 | } | |
473 | ||
474 | /** | |
475 | * security_compute_av - Compute access vector decisions. | |
476 | * @ssid: source security identifier | |
477 | * @tsid: target security identifier | |
478 | * @tclass: target security class | |
479 | * @requested: requested permissions | |
480 | * @avd: access vector decisions | |
481 | * | |
482 | * Compute a set of access vector decisions based on the | |
483 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
484 | * Return -%EINVAL if any of the parameters are invalid or %0 | |
485 | * if the access vector decisions were computed successfully. | |
486 | */ | |
487 | int security_compute_av(u32 ssid, | |
488 | u32 tsid, | |
489 | u16 tclass, | |
490 | u32 requested, | |
491 | struct av_decision *avd) | |
492 | { | |
493 | struct context *scontext = NULL, *tcontext = NULL; | |
494 | int rc = 0; | |
495 | ||
496 | if (!ss_initialized) { | |
4c443d1b SS |
497 | avd->allowed = 0xffffffff; |
498 | avd->decided = 0xffffffff; | |
1da177e4 LT |
499 | avd->auditallow = 0; |
500 | avd->auditdeny = 0xffffffff; | |
501 | avd->seqno = latest_granting; | |
502 | return 0; | |
503 | } | |
504 | ||
505 | POLICY_RDLOCK; | |
506 | ||
507 | scontext = sidtab_search(&sidtab, ssid); | |
508 | if (!scontext) { | |
509 | printk(KERN_ERR "security_compute_av: unrecognized SID %d\n", | |
510 | ssid); | |
511 | rc = -EINVAL; | |
512 | goto out; | |
513 | } | |
514 | tcontext = sidtab_search(&sidtab, tsid); | |
515 | if (!tcontext) { | |
516 | printk(KERN_ERR "security_compute_av: unrecognized SID %d\n", | |
517 | tsid); | |
518 | rc = -EINVAL; | |
519 | goto out; | |
520 | } | |
521 | ||
522 | rc = context_struct_compute_av(scontext, tcontext, tclass, | |
523 | requested, avd); | |
524 | out: | |
525 | POLICY_RDUNLOCK; | |
526 | return rc; | |
527 | } | |
528 | ||
529 | /* | |
530 | * Write the security context string representation of | |
531 | * the context structure `context' into a dynamically | |
532 | * allocated string of the correct size. Set `*scontext' | |
533 | * to point to this string and set `*scontext_len' to | |
534 | * the length of the string. | |
535 | */ | |
536 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
537 | { | |
538 | char *scontextp; | |
539 | ||
540 | *scontext = NULL; | |
541 | *scontext_len = 0; | |
542 | ||
543 | /* Compute the size of the context. */ | |
544 | *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; | |
545 | *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; | |
546 | *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; | |
547 | *scontext_len += mls_compute_context_len(context); | |
548 | ||
549 | /* Allocate space for the context; caller must free this space. */ | |
550 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
551 | if (!scontextp) { | |
552 | return -ENOMEM; | |
553 | } | |
554 | *scontext = scontextp; | |
555 | ||
556 | /* | |
557 | * Copy the user name, role name and type name into the context. | |
558 | */ | |
559 | sprintf(scontextp, "%s:%s:%s", | |
560 | policydb.p_user_val_to_name[context->user - 1], | |
561 | policydb.p_role_val_to_name[context->role - 1], | |
562 | policydb.p_type_val_to_name[context->type - 1]); | |
563 | scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + | |
564 | 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + | |
565 | 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); | |
566 | ||
567 | mls_sid_to_context(context, &scontextp); | |
568 | ||
569 | *scontextp = 0; | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
574 | #include "initial_sid_to_string.h" | |
575 | ||
576 | /** | |
577 | * security_sid_to_context - Obtain a context for a given SID. | |
578 | * @sid: security identifier, SID | |
579 | * @scontext: security context | |
580 | * @scontext_len: length in bytes | |
581 | * | |
582 | * Write the string representation of the context associated with @sid | |
583 | * into a dynamically allocated string of the correct size. Set @scontext | |
584 | * to point to this string and set @scontext_len to the length of the string. | |
585 | */ | |
586 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
587 | { | |
588 | struct context *context; | |
589 | int rc = 0; | |
590 | ||
591 | if (!ss_initialized) { | |
592 | if (sid <= SECINITSID_NUM) { | |
593 | char *scontextp; | |
594 | ||
595 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
596 | scontextp = kmalloc(*scontext_len,GFP_ATOMIC); | |
0cccca06 SH |
597 | if (!scontextp) { |
598 | rc = -ENOMEM; | |
599 | goto out; | |
600 | } | |
1da177e4 LT |
601 | strcpy(scontextp, initial_sid_to_string[sid]); |
602 | *scontext = scontextp; | |
603 | goto out; | |
604 | } | |
605 | printk(KERN_ERR "security_sid_to_context: called before initial " | |
606 | "load_policy on unknown SID %d\n", sid); | |
607 | rc = -EINVAL; | |
608 | goto out; | |
609 | } | |
610 | POLICY_RDLOCK; | |
611 | context = sidtab_search(&sidtab, sid); | |
612 | if (!context) { | |
613 | printk(KERN_ERR "security_sid_to_context: unrecognized SID " | |
614 | "%d\n", sid); | |
615 | rc = -EINVAL; | |
616 | goto out_unlock; | |
617 | } | |
618 | rc = context_struct_to_string(context, scontext, scontext_len); | |
619 | out_unlock: | |
620 | POLICY_RDUNLOCK; | |
621 | out: | |
622 | return rc; | |
623 | ||
624 | } | |
625 | ||
f5c1d5b2 | 626 | static int security_context_to_sid_core(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid) |
1da177e4 LT |
627 | { |
628 | char *scontext2; | |
629 | struct context context; | |
630 | struct role_datum *role; | |
631 | struct type_datum *typdatum; | |
632 | struct user_datum *usrdatum; | |
633 | char *scontextp, *p, oldc; | |
634 | int rc = 0; | |
635 | ||
636 | if (!ss_initialized) { | |
637 | int i; | |
638 | ||
639 | for (i = 1; i < SECINITSID_NUM; i++) { | |
640 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
641 | *sid = i; | |
642 | goto out; | |
643 | } | |
644 | } | |
645 | *sid = SECINITSID_KERNEL; | |
646 | goto out; | |
647 | } | |
648 | *sid = SECSID_NULL; | |
649 | ||
650 | /* Copy the string so that we can modify the copy as we parse it. | |
651 | The string should already by null terminated, but we append a | |
652 | null suffix to the copy to avoid problems with the existing | |
653 | attr package, which doesn't view the null terminator as part | |
654 | of the attribute value. */ | |
655 | scontext2 = kmalloc(scontext_len+1,GFP_KERNEL); | |
656 | if (!scontext2) { | |
657 | rc = -ENOMEM; | |
658 | goto out; | |
659 | } | |
660 | memcpy(scontext2, scontext, scontext_len); | |
661 | scontext2[scontext_len] = 0; | |
662 | ||
663 | context_init(&context); | |
664 | *sid = SECSID_NULL; | |
665 | ||
666 | POLICY_RDLOCK; | |
667 | ||
668 | /* Parse the security context. */ | |
669 | ||
670 | rc = -EINVAL; | |
671 | scontextp = (char *) scontext2; | |
672 | ||
673 | /* Extract the user. */ | |
674 | p = scontextp; | |
675 | while (*p && *p != ':') | |
676 | p++; | |
677 | ||
678 | if (*p == 0) | |
679 | goto out_unlock; | |
680 | ||
681 | *p++ = 0; | |
682 | ||
683 | usrdatum = hashtab_search(policydb.p_users.table, scontextp); | |
684 | if (!usrdatum) | |
685 | goto out_unlock; | |
686 | ||
687 | context.user = usrdatum->value; | |
688 | ||
689 | /* Extract role. */ | |
690 | scontextp = p; | |
691 | while (*p && *p != ':') | |
692 | p++; | |
693 | ||
694 | if (*p == 0) | |
695 | goto out_unlock; | |
696 | ||
697 | *p++ = 0; | |
698 | ||
699 | role = hashtab_search(policydb.p_roles.table, scontextp); | |
700 | if (!role) | |
701 | goto out_unlock; | |
702 | context.role = role->value; | |
703 | ||
704 | /* Extract type. */ | |
705 | scontextp = p; | |
706 | while (*p && *p != ':') | |
707 | p++; | |
708 | oldc = *p; | |
709 | *p++ = 0; | |
710 | ||
711 | typdatum = hashtab_search(policydb.p_types.table, scontextp); | |
712 | if (!typdatum) | |
713 | goto out_unlock; | |
714 | ||
715 | context.type = typdatum->value; | |
716 | ||
f5c1d5b2 | 717 | rc = mls_context_to_sid(oldc, &p, &context, &sidtab, def_sid); |
1da177e4 LT |
718 | if (rc) |
719 | goto out_unlock; | |
720 | ||
721 | if ((p - scontext2) < scontext_len) { | |
722 | rc = -EINVAL; | |
723 | goto out_unlock; | |
724 | } | |
725 | ||
726 | /* Check the validity of the new context. */ | |
727 | if (!policydb_context_isvalid(&policydb, &context)) { | |
728 | rc = -EINVAL; | |
729 | goto out_unlock; | |
730 | } | |
731 | /* Obtain the new sid. */ | |
732 | rc = sidtab_context_to_sid(&sidtab, &context, sid); | |
733 | out_unlock: | |
734 | POLICY_RDUNLOCK; | |
735 | context_destroy(&context); | |
736 | kfree(scontext2); | |
737 | out: | |
738 | return rc; | |
739 | } | |
740 | ||
f5c1d5b2 JM |
741 | /** |
742 | * security_context_to_sid - Obtain a SID for a given security context. | |
743 | * @scontext: security context | |
744 | * @scontext_len: length in bytes | |
745 | * @sid: security identifier, SID | |
746 | * | |
747 | * Obtains a SID associated with the security context that | |
748 | * has the string representation specified by @scontext. | |
749 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
750 | * memory is available, or 0 on success. | |
751 | */ | |
752 | int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid) | |
753 | { | |
754 | return security_context_to_sid_core(scontext, scontext_len, | |
755 | sid, SECSID_NULL); | |
756 | } | |
757 | ||
758 | /** | |
759 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
760 | * falling back to specified default if needed. | |
761 | * | |
762 | * @scontext: security context | |
763 | * @scontext_len: length in bytes | |
764 | * @sid: security identifier, SID | |
765 | * @def_sid: default SID to assign on errror | |
766 | * | |
767 | * Obtains a SID associated with the security context that | |
768 | * has the string representation specified by @scontext. | |
769 | * The default SID is passed to the MLS layer to be used to allow | |
770 | * kernel labeling of the MLS field if the MLS field is not present | |
771 | * (for upgrading to MLS without full relabel). | |
772 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
773 | * memory is available, or 0 on success. | |
774 | */ | |
775 | int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid) | |
776 | { | |
777 | return security_context_to_sid_core(scontext, scontext_len, | |
778 | sid, def_sid); | |
779 | } | |
780 | ||
1da177e4 LT |
781 | static int compute_sid_handle_invalid_context( |
782 | struct context *scontext, | |
783 | struct context *tcontext, | |
784 | u16 tclass, | |
785 | struct context *newcontext) | |
786 | { | |
787 | char *s = NULL, *t = NULL, *n = NULL; | |
788 | u32 slen, tlen, nlen; | |
789 | ||
790 | if (context_struct_to_string(scontext, &s, &slen) < 0) | |
791 | goto out; | |
792 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
793 | goto out; | |
794 | if (context_struct_to_string(newcontext, &n, &nlen) < 0) | |
795 | goto out; | |
9ad9ad38 | 796 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
797 | "security_compute_sid: invalid context %s" |
798 | " for scontext=%s" | |
799 | " tcontext=%s" | |
800 | " tclass=%s", | |
801 | n, s, t, policydb.p_class_val_to_name[tclass-1]); | |
802 | out: | |
803 | kfree(s); | |
804 | kfree(t); | |
805 | kfree(n); | |
806 | if (!selinux_enforcing) | |
807 | return 0; | |
808 | return -EACCES; | |
809 | } | |
810 | ||
811 | static int security_compute_sid(u32 ssid, | |
812 | u32 tsid, | |
813 | u16 tclass, | |
814 | u32 specified, | |
815 | u32 *out_sid) | |
816 | { | |
817 | struct context *scontext = NULL, *tcontext = NULL, newcontext; | |
818 | struct role_trans *roletr = NULL; | |
819 | struct avtab_key avkey; | |
820 | struct avtab_datum *avdatum; | |
821 | struct avtab_node *node; | |
1da177e4 LT |
822 | int rc = 0; |
823 | ||
824 | if (!ss_initialized) { | |
825 | switch (tclass) { | |
826 | case SECCLASS_PROCESS: | |
827 | *out_sid = ssid; | |
828 | break; | |
829 | default: | |
830 | *out_sid = tsid; | |
831 | break; | |
832 | } | |
833 | goto out; | |
834 | } | |
835 | ||
851f8a69 VY |
836 | context_init(&newcontext); |
837 | ||
1da177e4 LT |
838 | POLICY_RDLOCK; |
839 | ||
840 | scontext = sidtab_search(&sidtab, ssid); | |
841 | if (!scontext) { | |
842 | printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n", | |
843 | ssid); | |
844 | rc = -EINVAL; | |
845 | goto out_unlock; | |
846 | } | |
847 | tcontext = sidtab_search(&sidtab, tsid); | |
848 | if (!tcontext) { | |
849 | printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n", | |
850 | tsid); | |
851 | rc = -EINVAL; | |
852 | goto out_unlock; | |
853 | } | |
854 | ||
1da177e4 LT |
855 | /* Set the user identity. */ |
856 | switch (specified) { | |
857 | case AVTAB_TRANSITION: | |
858 | case AVTAB_CHANGE: | |
859 | /* Use the process user identity. */ | |
860 | newcontext.user = scontext->user; | |
861 | break; | |
862 | case AVTAB_MEMBER: | |
863 | /* Use the related object owner. */ | |
864 | newcontext.user = tcontext->user; | |
865 | break; | |
866 | } | |
867 | ||
868 | /* Set the role and type to default values. */ | |
869 | switch (tclass) { | |
870 | case SECCLASS_PROCESS: | |
871 | /* Use the current role and type of process. */ | |
872 | newcontext.role = scontext->role; | |
873 | newcontext.type = scontext->type; | |
874 | break; | |
875 | default: | |
876 | /* Use the well-defined object role. */ | |
877 | newcontext.role = OBJECT_R_VAL; | |
878 | /* Use the type of the related object. */ | |
879 | newcontext.type = tcontext->type; | |
880 | } | |
881 | ||
882 | /* Look for a type transition/member/change rule. */ | |
883 | avkey.source_type = scontext->type; | |
884 | avkey.target_type = tcontext->type; | |
885 | avkey.target_class = tclass; | |
782ebb99 SS |
886 | avkey.specified = specified; |
887 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
888 | |
889 | /* If no permanent rule, also check for enabled conditional rules */ | |
890 | if(!avdatum) { | |
782ebb99 | 891 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
1da177e4 | 892 | for (; node != NULL; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 893 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
894 | avdatum = &node->datum; |
895 | break; | |
896 | } | |
897 | } | |
898 | } | |
899 | ||
782ebb99 | 900 | if (avdatum) { |
1da177e4 | 901 | /* Use the type from the type transition/member/change rule. */ |
782ebb99 | 902 | newcontext.type = avdatum->data; |
1da177e4 LT |
903 | } |
904 | ||
905 | /* Check for class-specific changes. */ | |
906 | switch (tclass) { | |
907 | case SECCLASS_PROCESS: | |
908 | if (specified & AVTAB_TRANSITION) { | |
909 | /* Look for a role transition rule. */ | |
910 | for (roletr = policydb.role_tr; roletr; | |
911 | roletr = roletr->next) { | |
912 | if (roletr->role == scontext->role && | |
913 | roletr->type == tcontext->type) { | |
914 | /* Use the role transition rule. */ | |
915 | newcontext.role = roletr->new_role; | |
916 | break; | |
917 | } | |
918 | } | |
919 | } | |
920 | break; | |
921 | default: | |
922 | break; | |
923 | } | |
924 | ||
925 | /* Set the MLS attributes. | |
926 | This is done last because it may allocate memory. */ | |
927 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext); | |
928 | if (rc) | |
929 | goto out_unlock; | |
930 | ||
931 | /* Check the validity of the context. */ | |
932 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
933 | rc = compute_sid_handle_invalid_context(scontext, | |
934 | tcontext, | |
935 | tclass, | |
936 | &newcontext); | |
937 | if (rc) | |
938 | goto out_unlock; | |
939 | } | |
940 | /* Obtain the sid for the context. */ | |
941 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
942 | out_unlock: | |
943 | POLICY_RDUNLOCK; | |
944 | context_destroy(&newcontext); | |
945 | out: | |
946 | return rc; | |
947 | } | |
948 | ||
949 | /** | |
950 | * security_transition_sid - Compute the SID for a new subject/object. | |
951 | * @ssid: source security identifier | |
952 | * @tsid: target security identifier | |
953 | * @tclass: target security class | |
954 | * @out_sid: security identifier for new subject/object | |
955 | * | |
956 | * Compute a SID to use for labeling a new subject or object in the | |
957 | * class @tclass based on a SID pair (@ssid, @tsid). | |
958 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
959 | * if insufficient memory is available, or %0 if the new SID was | |
960 | * computed successfully. | |
961 | */ | |
962 | int security_transition_sid(u32 ssid, | |
963 | u32 tsid, | |
964 | u16 tclass, | |
965 | u32 *out_sid) | |
966 | { | |
967 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid); | |
968 | } | |
969 | ||
970 | /** | |
971 | * security_member_sid - Compute the SID for member selection. | |
972 | * @ssid: source security identifier | |
973 | * @tsid: target security identifier | |
974 | * @tclass: target security class | |
975 | * @out_sid: security identifier for selected member | |
976 | * | |
977 | * Compute a SID to use when selecting a member of a polyinstantiated | |
978 | * object of 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 SID was | |
981 | * computed successfully. | |
982 | */ | |
983 | int security_member_sid(u32 ssid, | |
984 | u32 tsid, | |
985 | u16 tclass, | |
986 | u32 *out_sid) | |
987 | { | |
988 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid); | |
989 | } | |
990 | ||
991 | /** | |
992 | * security_change_sid - Compute the SID for object relabeling. | |
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 for relabeling an object of class @tclass | |
999 | * 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_change_sid(u32 ssid, | |
1005 | u32 tsid, | |
1006 | u16 tclass, | |
1007 | u32 *out_sid) | |
1008 | { | |
1009 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid); | |
1010 | } | |
1011 | ||
1012 | /* | |
1013 | * Verify that each permission that is defined under the | |
1014 | * existing policy is still defined with the same value | |
1015 | * in the new policy. | |
1016 | */ | |
1017 | static int validate_perm(void *key, void *datum, void *p) | |
1018 | { | |
1019 | struct hashtab *h; | |
1020 | struct perm_datum *perdatum, *perdatum2; | |
1021 | int rc = 0; | |
1022 | ||
1023 | ||
1024 | h = p; | |
1025 | perdatum = datum; | |
1026 | ||
1027 | perdatum2 = hashtab_search(h, key); | |
1028 | if (!perdatum2) { | |
1029 | printk(KERN_ERR "security: permission %s disappeared", | |
1030 | (char *)key); | |
1031 | rc = -ENOENT; | |
1032 | goto out; | |
1033 | } | |
1034 | if (perdatum->value != perdatum2->value) { | |
1035 | printk(KERN_ERR "security: the value of permission %s changed", | |
1036 | (char *)key); | |
1037 | rc = -EINVAL; | |
1038 | } | |
1039 | out: | |
1040 | return rc; | |
1041 | } | |
1042 | ||
1043 | /* | |
1044 | * Verify that each class that is defined under the | |
1045 | * existing policy is still defined with the same | |
1046 | * attributes in the new policy. | |
1047 | */ | |
1048 | static int validate_class(void *key, void *datum, void *p) | |
1049 | { | |
1050 | struct policydb *newp; | |
1051 | struct class_datum *cladatum, *cladatum2; | |
1052 | int rc; | |
1053 | ||
1054 | newp = p; | |
1055 | cladatum = datum; | |
1056 | ||
1057 | cladatum2 = hashtab_search(newp->p_classes.table, key); | |
1058 | if (!cladatum2) { | |
1059 | printk(KERN_ERR "security: class %s disappeared\n", | |
1060 | (char *)key); | |
1061 | rc = -ENOENT; | |
1062 | goto out; | |
1063 | } | |
1064 | if (cladatum->value != cladatum2->value) { | |
1065 | printk(KERN_ERR "security: the value of class %s changed\n", | |
1066 | (char *)key); | |
1067 | rc = -EINVAL; | |
1068 | goto out; | |
1069 | } | |
1070 | if ((cladatum->comdatum && !cladatum2->comdatum) || | |
1071 | (!cladatum->comdatum && cladatum2->comdatum)) { | |
1072 | printk(KERN_ERR "security: the inherits clause for the access " | |
1073 | "vector definition for class %s changed\n", (char *)key); | |
1074 | rc = -EINVAL; | |
1075 | goto out; | |
1076 | } | |
1077 | if (cladatum->comdatum) { | |
1078 | rc = hashtab_map(cladatum->comdatum->permissions.table, validate_perm, | |
1079 | cladatum2->comdatum->permissions.table); | |
1080 | if (rc) { | |
1081 | printk(" in the access vector definition for class " | |
1082 | "%s\n", (char *)key); | |
1083 | goto out; | |
1084 | } | |
1085 | } | |
1086 | rc = hashtab_map(cladatum->permissions.table, validate_perm, | |
1087 | cladatum2->permissions.table); | |
1088 | if (rc) | |
1089 | printk(" in access vector definition for class %s\n", | |
1090 | (char *)key); | |
1091 | out: | |
1092 | return rc; | |
1093 | } | |
1094 | ||
1095 | /* Clone the SID into the new SID table. */ | |
1096 | static int clone_sid(u32 sid, | |
1097 | struct context *context, | |
1098 | void *arg) | |
1099 | { | |
1100 | struct sidtab *s = arg; | |
1101 | ||
1102 | return sidtab_insert(s, sid, context); | |
1103 | } | |
1104 | ||
1105 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1106 | { | |
1107 | int rc = 0; | |
1108 | ||
1109 | if (selinux_enforcing) { | |
1110 | rc = -EINVAL; | |
1111 | } else { | |
1112 | char *s; | |
1113 | u32 len; | |
1114 | ||
1115 | context_struct_to_string(context, &s, &len); | |
1116 | printk(KERN_ERR "security: context %s is invalid\n", s); | |
1117 | kfree(s); | |
1118 | } | |
1119 | return rc; | |
1120 | } | |
1121 | ||
1122 | struct convert_context_args { | |
1123 | struct policydb *oldp; | |
1124 | struct policydb *newp; | |
1125 | }; | |
1126 | ||
1127 | /* | |
1128 | * Convert the values in the security context | |
1129 | * structure `c' from the values specified | |
1130 | * in the policy `p->oldp' to the values specified | |
1131 | * in the policy `p->newp'. Verify that the | |
1132 | * context is valid under the new policy. | |
1133 | */ | |
1134 | static int convert_context(u32 key, | |
1135 | struct context *c, | |
1136 | void *p) | |
1137 | { | |
1138 | struct convert_context_args *args; | |
1139 | struct context oldc; | |
1140 | struct role_datum *role; | |
1141 | struct type_datum *typdatum; | |
1142 | struct user_datum *usrdatum; | |
1143 | char *s; | |
1144 | u32 len; | |
1145 | int rc; | |
1146 | ||
1147 | args = p; | |
1148 | ||
1149 | rc = context_cpy(&oldc, c); | |
1150 | if (rc) | |
1151 | goto out; | |
1152 | ||
1153 | rc = -EINVAL; | |
1154 | ||
1155 | /* Convert the user. */ | |
1156 | usrdatum = hashtab_search(args->newp->p_users.table, | |
1157 | args->oldp->p_user_val_to_name[c->user - 1]); | |
1158 | if (!usrdatum) { | |
1159 | goto bad; | |
1160 | } | |
1161 | c->user = usrdatum->value; | |
1162 | ||
1163 | /* Convert the role. */ | |
1164 | role = hashtab_search(args->newp->p_roles.table, | |
1165 | args->oldp->p_role_val_to_name[c->role - 1]); | |
1166 | if (!role) { | |
1167 | goto bad; | |
1168 | } | |
1169 | c->role = role->value; | |
1170 | ||
1171 | /* Convert the type. */ | |
1172 | typdatum = hashtab_search(args->newp->p_types.table, | |
1173 | args->oldp->p_type_val_to_name[c->type - 1]); | |
1174 | if (!typdatum) { | |
1175 | goto bad; | |
1176 | } | |
1177 | c->type = typdatum->value; | |
1178 | ||
1179 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1180 | if (rc) | |
1181 | goto bad; | |
1182 | ||
1183 | /* Check the validity of the new context. */ | |
1184 | if (!policydb_context_isvalid(args->newp, c)) { | |
1185 | rc = convert_context_handle_invalid_context(&oldc); | |
1186 | if (rc) | |
1187 | goto bad; | |
1188 | } | |
1189 | ||
1190 | context_destroy(&oldc); | |
1191 | out: | |
1192 | return rc; | |
1193 | bad: | |
1194 | context_struct_to_string(&oldc, &s, &len); | |
1195 | context_destroy(&oldc); | |
1196 | printk(KERN_ERR "security: invalidating context %s\n", s); | |
1197 | kfree(s); | |
1198 | goto out; | |
1199 | } | |
1200 | ||
1201 | extern void selinux_complete_init(void); | |
1202 | ||
1203 | /** | |
1204 | * security_load_policy - Load a security policy configuration. | |
1205 | * @data: binary policy data | |
1206 | * @len: length of data in bytes | |
1207 | * | |
1208 | * Load a new set of security policy configuration data, | |
1209 | * validate it and convert the SID table as necessary. | |
1210 | * This function will flush the access vector cache after | |
1211 | * loading the new policy. | |
1212 | */ | |
1213 | int security_load_policy(void *data, size_t len) | |
1214 | { | |
1215 | struct policydb oldpolicydb, newpolicydb; | |
1216 | struct sidtab oldsidtab, newsidtab; | |
1217 | struct convert_context_args args; | |
1218 | u32 seqno; | |
1219 | int rc = 0; | |
1220 | struct policy_file file = { data, len }, *fp = &file; | |
1221 | ||
1222 | LOAD_LOCK; | |
1223 | ||
1224 | if (!ss_initialized) { | |
1225 | avtab_cache_init(); | |
1226 | if (policydb_read(&policydb, fp)) { | |
1227 | LOAD_UNLOCK; | |
1228 | avtab_cache_destroy(); | |
1229 | return -EINVAL; | |
1230 | } | |
1231 | if (policydb_load_isids(&policydb, &sidtab)) { | |
1232 | LOAD_UNLOCK; | |
1233 | policydb_destroy(&policydb); | |
1234 | avtab_cache_destroy(); | |
1235 | return -EINVAL; | |
1236 | } | |
1237 | policydb_loaded_version = policydb.policyvers; | |
1238 | ss_initialized = 1; | |
4c443d1b | 1239 | seqno = ++latest_granting; |
1da177e4 LT |
1240 | LOAD_UNLOCK; |
1241 | selinux_complete_init(); | |
4c443d1b SS |
1242 | avc_ss_reset(seqno); |
1243 | selnl_notify_policyload(seqno); | |
1da177e4 LT |
1244 | return 0; |
1245 | } | |
1246 | ||
1247 | #if 0 | |
1248 | sidtab_hash_eval(&sidtab, "sids"); | |
1249 | #endif | |
1250 | ||
1251 | if (policydb_read(&newpolicydb, fp)) { | |
1252 | LOAD_UNLOCK; | |
1253 | return -EINVAL; | |
1254 | } | |
1255 | ||
1256 | sidtab_init(&newsidtab); | |
1257 | ||
1258 | /* Verify that the existing classes did not change. */ | |
1259 | if (hashtab_map(policydb.p_classes.table, validate_class, &newpolicydb)) { | |
1260 | printk(KERN_ERR "security: the definition of an existing " | |
1261 | "class changed\n"); | |
1262 | rc = -EINVAL; | |
1263 | goto err; | |
1264 | } | |
1265 | ||
1266 | /* Clone the SID table. */ | |
1267 | sidtab_shutdown(&sidtab); | |
1268 | if (sidtab_map(&sidtab, clone_sid, &newsidtab)) { | |
1269 | rc = -ENOMEM; | |
1270 | goto err; | |
1271 | } | |
1272 | ||
1273 | /* Convert the internal representations of contexts | |
1274 | in the new SID table and remove invalid SIDs. */ | |
1275 | args.oldp = &policydb; | |
1276 | args.newp = &newpolicydb; | |
1277 | sidtab_map_remove_on_error(&newsidtab, convert_context, &args); | |
1278 | ||
1279 | /* Save the old policydb and SID table to free later. */ | |
1280 | memcpy(&oldpolicydb, &policydb, sizeof policydb); | |
1281 | sidtab_set(&oldsidtab, &sidtab); | |
1282 | ||
1283 | /* Install the new policydb and SID table. */ | |
1284 | POLICY_WRLOCK; | |
1285 | memcpy(&policydb, &newpolicydb, sizeof policydb); | |
1286 | sidtab_set(&sidtab, &newsidtab); | |
1287 | seqno = ++latest_granting; | |
1288 | policydb_loaded_version = policydb.policyvers; | |
1289 | POLICY_WRUNLOCK; | |
1290 | LOAD_UNLOCK; | |
1291 | ||
1292 | /* Free the old policydb and SID table. */ | |
1293 | policydb_destroy(&oldpolicydb); | |
1294 | sidtab_destroy(&oldsidtab); | |
1295 | ||
1296 | avc_ss_reset(seqno); | |
1297 | selnl_notify_policyload(seqno); | |
1298 | ||
1299 | return 0; | |
1300 | ||
1301 | err: | |
1302 | LOAD_UNLOCK; | |
1303 | sidtab_destroy(&newsidtab); | |
1304 | policydb_destroy(&newpolicydb); | |
1305 | return rc; | |
1306 | ||
1307 | } | |
1308 | ||
1309 | /** | |
1310 | * security_port_sid - Obtain the SID for a port. | |
1311 | * @domain: communication domain aka address family | |
1312 | * @type: socket type | |
1313 | * @protocol: protocol number | |
1314 | * @port: port number | |
1315 | * @out_sid: security identifier | |
1316 | */ | |
1317 | int security_port_sid(u16 domain, | |
1318 | u16 type, | |
1319 | u8 protocol, | |
1320 | u16 port, | |
1321 | u32 *out_sid) | |
1322 | { | |
1323 | struct ocontext *c; | |
1324 | int rc = 0; | |
1325 | ||
1326 | POLICY_RDLOCK; | |
1327 | ||
1328 | c = policydb.ocontexts[OCON_PORT]; | |
1329 | while (c) { | |
1330 | if (c->u.port.protocol == protocol && | |
1331 | c->u.port.low_port <= port && | |
1332 | c->u.port.high_port >= port) | |
1333 | break; | |
1334 | c = c->next; | |
1335 | } | |
1336 | ||
1337 | if (c) { | |
1338 | if (!c->sid[0]) { | |
1339 | rc = sidtab_context_to_sid(&sidtab, | |
1340 | &c->context[0], | |
1341 | &c->sid[0]); | |
1342 | if (rc) | |
1343 | goto out; | |
1344 | } | |
1345 | *out_sid = c->sid[0]; | |
1346 | } else { | |
1347 | *out_sid = SECINITSID_PORT; | |
1348 | } | |
1349 | ||
1350 | out: | |
1351 | POLICY_RDUNLOCK; | |
1352 | return rc; | |
1353 | } | |
1354 | ||
1355 | /** | |
1356 | * security_netif_sid - Obtain the SID for a network interface. | |
1357 | * @name: interface name | |
1358 | * @if_sid: interface SID | |
1359 | * @msg_sid: default SID for received packets | |
1360 | */ | |
1361 | int security_netif_sid(char *name, | |
1362 | u32 *if_sid, | |
1363 | u32 *msg_sid) | |
1364 | { | |
1365 | int rc = 0; | |
1366 | struct ocontext *c; | |
1367 | ||
1368 | POLICY_RDLOCK; | |
1369 | ||
1370 | c = policydb.ocontexts[OCON_NETIF]; | |
1371 | while (c) { | |
1372 | if (strcmp(name, c->u.name) == 0) | |
1373 | break; | |
1374 | c = c->next; | |
1375 | } | |
1376 | ||
1377 | if (c) { | |
1378 | if (!c->sid[0] || !c->sid[1]) { | |
1379 | rc = sidtab_context_to_sid(&sidtab, | |
1380 | &c->context[0], | |
1381 | &c->sid[0]); | |
1382 | if (rc) | |
1383 | goto out; | |
1384 | rc = sidtab_context_to_sid(&sidtab, | |
1385 | &c->context[1], | |
1386 | &c->sid[1]); | |
1387 | if (rc) | |
1388 | goto out; | |
1389 | } | |
1390 | *if_sid = c->sid[0]; | |
1391 | *msg_sid = c->sid[1]; | |
1392 | } else { | |
1393 | *if_sid = SECINITSID_NETIF; | |
1394 | *msg_sid = SECINITSID_NETMSG; | |
1395 | } | |
1396 | ||
1397 | out: | |
1398 | POLICY_RDUNLOCK; | |
1399 | return rc; | |
1400 | } | |
1401 | ||
1402 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
1403 | { | |
1404 | int i, fail = 0; | |
1405 | ||
1406 | for(i = 0; i < 4; i++) | |
1407 | if(addr[i] != (input[i] & mask[i])) { | |
1408 | fail = 1; | |
1409 | break; | |
1410 | } | |
1411 | ||
1412 | return !fail; | |
1413 | } | |
1414 | ||
1415 | /** | |
1416 | * security_node_sid - Obtain the SID for a node (host). | |
1417 | * @domain: communication domain aka address family | |
1418 | * @addrp: address | |
1419 | * @addrlen: address length in bytes | |
1420 | * @out_sid: security identifier | |
1421 | */ | |
1422 | int security_node_sid(u16 domain, | |
1423 | void *addrp, | |
1424 | u32 addrlen, | |
1425 | u32 *out_sid) | |
1426 | { | |
1427 | int rc = 0; | |
1428 | struct ocontext *c; | |
1429 | ||
1430 | POLICY_RDLOCK; | |
1431 | ||
1432 | switch (domain) { | |
1433 | case AF_INET: { | |
1434 | u32 addr; | |
1435 | ||
1436 | if (addrlen != sizeof(u32)) { | |
1437 | rc = -EINVAL; | |
1438 | goto out; | |
1439 | } | |
1440 | ||
1441 | addr = *((u32 *)addrp); | |
1442 | ||
1443 | c = policydb.ocontexts[OCON_NODE]; | |
1444 | while (c) { | |
1445 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
1446 | break; | |
1447 | c = c->next; | |
1448 | } | |
1449 | break; | |
1450 | } | |
1451 | ||
1452 | case AF_INET6: | |
1453 | if (addrlen != sizeof(u64) * 2) { | |
1454 | rc = -EINVAL; | |
1455 | goto out; | |
1456 | } | |
1457 | c = policydb.ocontexts[OCON_NODE6]; | |
1458 | while (c) { | |
1459 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
1460 | c->u.node6.mask)) | |
1461 | break; | |
1462 | c = c->next; | |
1463 | } | |
1464 | break; | |
1465 | ||
1466 | default: | |
1467 | *out_sid = SECINITSID_NODE; | |
1468 | goto out; | |
1469 | } | |
1470 | ||
1471 | if (c) { | |
1472 | if (!c->sid[0]) { | |
1473 | rc = sidtab_context_to_sid(&sidtab, | |
1474 | &c->context[0], | |
1475 | &c->sid[0]); | |
1476 | if (rc) | |
1477 | goto out; | |
1478 | } | |
1479 | *out_sid = c->sid[0]; | |
1480 | } else { | |
1481 | *out_sid = SECINITSID_NODE; | |
1482 | } | |
1483 | ||
1484 | out: | |
1485 | POLICY_RDUNLOCK; | |
1486 | return rc; | |
1487 | } | |
1488 | ||
1489 | #define SIDS_NEL 25 | |
1490 | ||
1491 | /** | |
1492 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
1493 | * @fromsid: starting SID | |
1494 | * @username: username | |
1495 | * @sids: array of reachable SIDs for user | |
1496 | * @nel: number of elements in @sids | |
1497 | * | |
1498 | * Generate the set of SIDs for legal security contexts | |
1499 | * for a given user that can be reached by @fromsid. | |
1500 | * Set *@sids to point to a dynamically allocated | |
1501 | * array containing the set of SIDs. Set *@nel to the | |
1502 | * number of elements in the array. | |
1503 | */ | |
1504 | ||
1505 | int security_get_user_sids(u32 fromsid, | |
1506 | char *username, | |
1507 | u32 **sids, | |
1508 | u32 *nel) | |
1509 | { | |
1510 | struct context *fromcon, usercon; | |
1511 | u32 *mysids, *mysids2, sid; | |
1512 | u32 mynel = 0, maxnel = SIDS_NEL; | |
1513 | struct user_datum *user; | |
1514 | struct role_datum *role; | |
1515 | struct av_decision avd; | |
782ebb99 | 1516 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
1517 | int rc = 0, i, j; |
1518 | ||
1519 | if (!ss_initialized) { | |
1520 | *sids = NULL; | |
1521 | *nel = 0; | |
1522 | goto out; | |
1523 | } | |
1524 | ||
1525 | POLICY_RDLOCK; | |
1526 | ||
1527 | fromcon = sidtab_search(&sidtab, fromsid); | |
1528 | if (!fromcon) { | |
1529 | rc = -EINVAL; | |
1530 | goto out_unlock; | |
1531 | } | |
1532 | ||
1533 | user = hashtab_search(policydb.p_users.table, username); | |
1534 | if (!user) { | |
1535 | rc = -EINVAL; | |
1536 | goto out_unlock; | |
1537 | } | |
1538 | usercon.user = user->value; | |
1539 | ||
89d155ef | 1540 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
1da177e4 LT |
1541 | if (!mysids) { |
1542 | rc = -ENOMEM; | |
1543 | goto out_unlock; | |
1544 | } | |
1da177e4 | 1545 | |
782ebb99 SS |
1546 | ebitmap_for_each_bit(&user->roles, rnode, i) { |
1547 | if (!ebitmap_node_get_bit(rnode, i)) | |
1da177e4 LT |
1548 | continue; |
1549 | role = policydb.role_val_to_struct[i]; | |
1550 | usercon.role = i+1; | |
782ebb99 SS |
1551 | ebitmap_for_each_bit(&role->types, tnode, j) { |
1552 | if (!ebitmap_node_get_bit(tnode, j)) | |
1da177e4 LT |
1553 | continue; |
1554 | usercon.type = j+1; | |
1555 | ||
1556 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
1557 | continue; | |
1558 | ||
1559 | rc = context_struct_compute_av(fromcon, &usercon, | |
1560 | SECCLASS_PROCESS, | |
1561 | PROCESS__TRANSITION, | |
1562 | &avd); | |
1563 | if (rc || !(avd.allowed & PROCESS__TRANSITION)) | |
1564 | continue; | |
1565 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); | |
1566 | if (rc) { | |
1567 | kfree(mysids); | |
1568 | goto out_unlock; | |
1569 | } | |
1570 | if (mynel < maxnel) { | |
1571 | mysids[mynel++] = sid; | |
1572 | } else { | |
1573 | maxnel += SIDS_NEL; | |
89d155ef | 1574 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
1da177e4 LT |
1575 | if (!mysids2) { |
1576 | rc = -ENOMEM; | |
1577 | kfree(mysids); | |
1578 | goto out_unlock; | |
1579 | } | |
1da177e4 LT |
1580 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
1581 | kfree(mysids); | |
1582 | mysids = mysids2; | |
1583 | mysids[mynel++] = sid; | |
1584 | } | |
1585 | } | |
1586 | } | |
1587 | ||
1588 | *sids = mysids; | |
1589 | *nel = mynel; | |
1590 | ||
1591 | out_unlock: | |
1592 | POLICY_RDUNLOCK; | |
1593 | out: | |
1594 | return rc; | |
1595 | } | |
1596 | ||
1597 | /** | |
1598 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
1599 | * @fstype: filesystem type | |
1600 | * @path: path from root of mount | |
1601 | * @sclass: file security class | |
1602 | * @sid: SID for path | |
1603 | * | |
1604 | * Obtain a SID to use for a file in a filesystem that | |
1605 | * cannot support xattr or use a fixed labeling behavior like | |
1606 | * transition SIDs or task SIDs. | |
1607 | */ | |
1608 | int security_genfs_sid(const char *fstype, | |
1609 | char *path, | |
1610 | u16 sclass, | |
1611 | u32 *sid) | |
1612 | { | |
1613 | int len; | |
1614 | struct genfs *genfs; | |
1615 | struct ocontext *c; | |
1616 | int rc = 0, cmp = 0; | |
1617 | ||
1618 | POLICY_RDLOCK; | |
1619 | ||
1620 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { | |
1621 | cmp = strcmp(fstype, genfs->fstype); | |
1622 | if (cmp <= 0) | |
1623 | break; | |
1624 | } | |
1625 | ||
1626 | if (!genfs || cmp) { | |
1627 | *sid = SECINITSID_UNLABELED; | |
1628 | rc = -ENOENT; | |
1629 | goto out; | |
1630 | } | |
1631 | ||
1632 | for (c = genfs->head; c; c = c->next) { | |
1633 | len = strlen(c->u.name); | |
1634 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
1635 | (strncmp(c->u.name, path, len) == 0)) | |
1636 | break; | |
1637 | } | |
1638 | ||
1639 | if (!c) { | |
1640 | *sid = SECINITSID_UNLABELED; | |
1641 | rc = -ENOENT; | |
1642 | goto out; | |
1643 | } | |
1644 | ||
1645 | if (!c->sid[0]) { | |
1646 | rc = sidtab_context_to_sid(&sidtab, | |
1647 | &c->context[0], | |
1648 | &c->sid[0]); | |
1649 | if (rc) | |
1650 | goto out; | |
1651 | } | |
1652 | ||
1653 | *sid = c->sid[0]; | |
1654 | out: | |
1655 | POLICY_RDUNLOCK; | |
1656 | return rc; | |
1657 | } | |
1658 | ||
1659 | /** | |
1660 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
1661 | * @fstype: filesystem type | |
1662 | * @behavior: labeling behavior | |
1663 | * @sid: SID for filesystem (superblock) | |
1664 | */ | |
1665 | int security_fs_use( | |
1666 | const char *fstype, | |
1667 | unsigned int *behavior, | |
1668 | u32 *sid) | |
1669 | { | |
1670 | int rc = 0; | |
1671 | struct ocontext *c; | |
1672 | ||
1673 | POLICY_RDLOCK; | |
1674 | ||
1675 | c = policydb.ocontexts[OCON_FSUSE]; | |
1676 | while (c) { | |
1677 | if (strcmp(fstype, c->u.name) == 0) | |
1678 | break; | |
1679 | c = c->next; | |
1680 | } | |
1681 | ||
1682 | if (c) { | |
1683 | *behavior = c->v.behavior; | |
1684 | if (!c->sid[0]) { | |
1685 | rc = sidtab_context_to_sid(&sidtab, | |
1686 | &c->context[0], | |
1687 | &c->sid[0]); | |
1688 | if (rc) | |
1689 | goto out; | |
1690 | } | |
1691 | *sid = c->sid[0]; | |
1692 | } else { | |
1693 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); | |
1694 | if (rc) { | |
1695 | *behavior = SECURITY_FS_USE_NONE; | |
1696 | rc = 0; | |
1697 | } else { | |
1698 | *behavior = SECURITY_FS_USE_GENFS; | |
1699 | } | |
1700 | } | |
1701 | ||
1702 | out: | |
1703 | POLICY_RDUNLOCK; | |
1704 | return rc; | |
1705 | } | |
1706 | ||
1707 | int security_get_bools(int *len, char ***names, int **values) | |
1708 | { | |
1709 | int i, rc = -ENOMEM; | |
1710 | ||
1711 | POLICY_RDLOCK; | |
1712 | *names = NULL; | |
1713 | *values = NULL; | |
1714 | ||
1715 | *len = policydb.p_bools.nprim; | |
1716 | if (!*len) { | |
1717 | rc = 0; | |
1718 | goto out; | |
1719 | } | |
1720 | ||
e0795cf4 | 1721 | *names = kcalloc(*len, sizeof(char*), GFP_ATOMIC); |
1da177e4 LT |
1722 | if (!*names) |
1723 | goto err; | |
1da177e4 | 1724 | |
e0795cf4 | 1725 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); |
1da177e4 LT |
1726 | if (!*values) |
1727 | goto err; | |
1728 | ||
1729 | for (i = 0; i < *len; i++) { | |
1730 | size_t name_len; | |
1731 | (*values)[i] = policydb.bool_val_to_struct[i]->state; | |
1732 | name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; | |
e0795cf4 | 1733 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); |
1da177e4 LT |
1734 | if (!(*names)[i]) |
1735 | goto err; | |
1736 | strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); | |
1737 | (*names)[i][name_len - 1] = 0; | |
1738 | } | |
1739 | rc = 0; | |
1740 | out: | |
1741 | POLICY_RDUNLOCK; | |
1742 | return rc; | |
1743 | err: | |
1744 | if (*names) { | |
1745 | for (i = 0; i < *len; i++) | |
9a5f04bf | 1746 | kfree((*names)[i]); |
1da177e4 | 1747 | } |
9a5f04bf | 1748 | kfree(*values); |
1da177e4 LT |
1749 | goto out; |
1750 | } | |
1751 | ||
1752 | ||
1753 | int security_set_bools(int len, int *values) | |
1754 | { | |
1755 | int i, rc = 0; | |
1756 | int lenp, seqno = 0; | |
1757 | struct cond_node *cur; | |
1758 | ||
1759 | POLICY_WRLOCK; | |
1760 | ||
1761 | lenp = policydb.p_bools.nprim; | |
1762 | if (len != lenp) { | |
1763 | rc = -EFAULT; | |
1764 | goto out; | |
1765 | } | |
1766 | ||
1da177e4 | 1767 | for (i = 0; i < len; i++) { |
af601e46 SG |
1768 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
1769 | audit_log(current->audit_context, GFP_ATOMIC, | |
1770 | AUDIT_MAC_CONFIG_CHANGE, | |
1771 | "bool=%s val=%d old_val=%d auid=%u", | |
1772 | policydb.p_bool_val_to_name[i], | |
1773 | !!values[i], | |
1774 | policydb.bool_val_to_struct[i]->state, | |
1775 | audit_get_loginuid(current->audit_context)); | |
1776 | } | |
1da177e4 LT |
1777 | if (values[i]) { |
1778 | policydb.bool_val_to_struct[i]->state = 1; | |
1779 | } else { | |
1780 | policydb.bool_val_to_struct[i]->state = 0; | |
1781 | } | |
1da177e4 | 1782 | } |
1da177e4 LT |
1783 | |
1784 | for (cur = policydb.cond_list; cur != NULL; cur = cur->next) { | |
1785 | rc = evaluate_cond_node(&policydb, cur); | |
1786 | if (rc) | |
1787 | goto out; | |
1788 | } | |
1789 | ||
1790 | seqno = ++latest_granting; | |
1791 | ||
1792 | out: | |
1793 | POLICY_WRUNLOCK; | |
1794 | if (!rc) { | |
1795 | avc_ss_reset(seqno); | |
1796 | selnl_notify_policyload(seqno); | |
1797 | } | |
1798 | return rc; | |
1799 | } | |
1800 | ||
1801 | int security_get_bool_value(int bool) | |
1802 | { | |
1803 | int rc = 0; | |
1804 | int len; | |
1805 | ||
1806 | POLICY_RDLOCK; | |
1807 | ||
1808 | len = policydb.p_bools.nprim; | |
1809 | if (bool >= len) { | |
1810 | rc = -EFAULT; | |
1811 | goto out; | |
1812 | } | |
1813 | ||
1814 | rc = policydb.bool_val_to_struct[bool]->state; | |
1815 | out: | |
1816 | POLICY_RDUNLOCK; | |
1817 | return rc; | |
1818 | } | |
376bd9cb | 1819 | |
08554d6b VY |
1820 | /* |
1821 | * security_sid_mls_copy() - computes a new sid based on the given | |
1822 | * sid and the mls portion of mls_sid. | |
1823 | */ | |
1824 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
1825 | { | |
1826 | struct context *context1; | |
1827 | struct context *context2; | |
1828 | struct context newcon; | |
1829 | char *s; | |
1830 | u32 len; | |
1831 | int rc = 0; | |
1832 | ||
1833 | if (!ss_initialized) { | |
1834 | *new_sid = sid; | |
1835 | goto out; | |
1836 | } | |
1837 | ||
1838 | context_init(&newcon); | |
1839 | ||
1840 | POLICY_RDLOCK; | |
1841 | context1 = sidtab_search(&sidtab, sid); | |
1842 | if (!context1) { | |
1843 | printk(KERN_ERR "security_sid_mls_copy: unrecognized SID " | |
1844 | "%d\n", sid); | |
1845 | rc = -EINVAL; | |
1846 | goto out_unlock; | |
1847 | } | |
1848 | ||
1849 | context2 = sidtab_search(&sidtab, mls_sid); | |
1850 | if (!context2) { | |
1851 | printk(KERN_ERR "security_sid_mls_copy: unrecognized SID " | |
1852 | "%d\n", mls_sid); | |
1853 | rc = -EINVAL; | |
1854 | goto out_unlock; | |
1855 | } | |
1856 | ||
1857 | newcon.user = context1->user; | |
1858 | newcon.role = context1->role; | |
1859 | newcon.type = context1->type; | |
1860 | rc = mls_copy_context(&newcon, context2); | |
1861 | if (rc) | |
1862 | goto out_unlock; | |
1863 | ||
1864 | ||
1865 | /* Check the validity of the new context. */ | |
1866 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
1867 | rc = convert_context_handle_invalid_context(&newcon); | |
1868 | if (rc) | |
1869 | goto bad; | |
1870 | } | |
1871 | ||
1872 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
1873 | goto out_unlock; | |
1874 | ||
1875 | bad: | |
1876 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
1877 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
1878 | "security_sid_mls_copy: invalid context %s", s); | |
1879 | kfree(s); | |
1880 | } | |
1881 | ||
1882 | out_unlock: | |
1883 | POLICY_RDUNLOCK; | |
1884 | context_destroy(&newcon); | |
1885 | out: | |
1886 | return rc; | |
1887 | } | |
1888 | ||
376bd9cb DG |
1889 | struct selinux_audit_rule { |
1890 | u32 au_seqno; | |
1891 | struct context au_ctxt; | |
1892 | }; | |
1893 | ||
1894 | void selinux_audit_rule_free(struct selinux_audit_rule *rule) | |
1895 | { | |
1896 | if (rule) { | |
1897 | context_destroy(&rule->au_ctxt); | |
1898 | kfree(rule); | |
1899 | } | |
1900 | } | |
1901 | ||
1902 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, | |
1903 | struct selinux_audit_rule **rule) | |
1904 | { | |
1905 | struct selinux_audit_rule *tmprule; | |
1906 | struct role_datum *roledatum; | |
1907 | struct type_datum *typedatum; | |
1908 | struct user_datum *userdatum; | |
1909 | int rc = 0; | |
1910 | ||
1911 | *rule = NULL; | |
1912 | ||
1913 | if (!ss_initialized) | |
1914 | return -ENOTSUPP; | |
1915 | ||
1916 | switch (field) { | |
3a6b9f85 DG |
1917 | case AUDIT_SUBJ_USER: |
1918 | case AUDIT_SUBJ_ROLE: | |
1919 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
1920 | case AUDIT_OBJ_USER: |
1921 | case AUDIT_OBJ_ROLE: | |
1922 | case AUDIT_OBJ_TYPE: | |
376bd9cb DG |
1923 | /* only 'equals' and 'not equals' fit user, role, and type */ |
1924 | if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL) | |
1925 | return -EINVAL; | |
1926 | break; | |
3a6b9f85 DG |
1927 | case AUDIT_SUBJ_SEN: |
1928 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
1929 | case AUDIT_OBJ_LEV_LOW: |
1930 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
1931 | /* we do not allow a range, indicated by the presense of '-' */ |
1932 | if (strchr(rulestr, '-')) | |
1933 | return -EINVAL; | |
1934 | break; | |
1935 | default: | |
1936 | /* only the above fields are valid */ | |
1937 | return -EINVAL; | |
1938 | } | |
1939 | ||
1940 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
1941 | if (!tmprule) | |
1942 | return -ENOMEM; | |
1943 | ||
1944 | context_init(&tmprule->au_ctxt); | |
1945 | ||
1946 | POLICY_RDLOCK; | |
1947 | ||
1948 | tmprule->au_seqno = latest_granting; | |
1949 | ||
1950 | switch (field) { | |
3a6b9f85 | 1951 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 1952 | case AUDIT_OBJ_USER: |
376bd9cb DG |
1953 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
1954 | if (!userdatum) | |
1955 | rc = -EINVAL; | |
1956 | else | |
1957 | tmprule->au_ctxt.user = userdatum->value; | |
1958 | break; | |
3a6b9f85 | 1959 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 1960 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
1961 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
1962 | if (!roledatum) | |
1963 | rc = -EINVAL; | |
1964 | else | |
1965 | tmprule->au_ctxt.role = roledatum->value; | |
1966 | break; | |
3a6b9f85 | 1967 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 1968 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
1969 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
1970 | if (!typedatum) | |
1971 | rc = -EINVAL; | |
1972 | else | |
1973 | tmprule->au_ctxt.type = typedatum->value; | |
1974 | break; | |
3a6b9f85 DG |
1975 | case AUDIT_SUBJ_SEN: |
1976 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
1977 | case AUDIT_OBJ_LEV_LOW: |
1978 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
1979 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
1980 | break; | |
1981 | } | |
1982 | ||
1983 | POLICY_RDUNLOCK; | |
1984 | ||
1985 | if (rc) { | |
1986 | selinux_audit_rule_free(tmprule); | |
1987 | tmprule = NULL; | |
1988 | } | |
1989 | ||
1990 | *rule = tmprule; | |
1991 | ||
1992 | return rc; | |
1993 | } | |
1994 | ||
1995 | int selinux_audit_rule_match(u32 ctxid, u32 field, u32 op, | |
1996 | struct selinux_audit_rule *rule, | |
1997 | struct audit_context *actx) | |
1998 | { | |
1999 | struct context *ctxt; | |
2000 | struct mls_level *level; | |
2001 | int match = 0; | |
2002 | ||
2003 | if (!rule) { | |
2004 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2005 | "selinux_audit_rule_match: missing rule\n"); | |
2006 | return -ENOENT; | |
2007 | } | |
2008 | ||
2009 | POLICY_RDLOCK; | |
2010 | ||
2011 | if (rule->au_seqno < latest_granting) { | |
2012 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2013 | "selinux_audit_rule_match: stale rule\n"); | |
2014 | match = -ESTALE; | |
2015 | goto out; | |
2016 | } | |
2017 | ||
2018 | ctxt = sidtab_search(&sidtab, ctxid); | |
2019 | if (!ctxt) { | |
2020 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2021 | "selinux_audit_rule_match: unrecognized SID %d\n", | |
2022 | ctxid); | |
2023 | match = -ENOENT; | |
2024 | goto out; | |
2025 | } | |
2026 | ||
2027 | /* a field/op pair that is not caught here will simply fall through | |
2028 | without a match */ | |
2029 | switch (field) { | |
3a6b9f85 | 2030 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2031 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2032 | switch (op) { |
2033 | case AUDIT_EQUAL: | |
2034 | match = (ctxt->user == rule->au_ctxt.user); | |
2035 | break; | |
2036 | case AUDIT_NOT_EQUAL: | |
2037 | match = (ctxt->user != rule->au_ctxt.user); | |
2038 | break; | |
2039 | } | |
2040 | break; | |
3a6b9f85 | 2041 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2042 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2043 | switch (op) { |
2044 | case AUDIT_EQUAL: | |
2045 | match = (ctxt->role == rule->au_ctxt.role); | |
2046 | break; | |
2047 | case AUDIT_NOT_EQUAL: | |
2048 | match = (ctxt->role != rule->au_ctxt.role); | |
2049 | break; | |
2050 | } | |
2051 | break; | |
3a6b9f85 | 2052 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2053 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2054 | switch (op) { |
2055 | case AUDIT_EQUAL: | |
2056 | match = (ctxt->type == rule->au_ctxt.type); | |
2057 | break; | |
2058 | case AUDIT_NOT_EQUAL: | |
2059 | match = (ctxt->type != rule->au_ctxt.type); | |
2060 | break; | |
2061 | } | |
2062 | break; | |
3a6b9f85 DG |
2063 | case AUDIT_SUBJ_SEN: |
2064 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2065 | case AUDIT_OBJ_LEV_LOW: |
2066 | case AUDIT_OBJ_LEV_HIGH: | |
2067 | level = ((field == AUDIT_SUBJ_SEN || | |
2068 | field == AUDIT_OBJ_LEV_LOW) ? | |
376bd9cb DG |
2069 | &ctxt->range.level[0] : &ctxt->range.level[1]); |
2070 | switch (op) { | |
2071 | case AUDIT_EQUAL: | |
2072 | match = mls_level_eq(&rule->au_ctxt.range.level[0], | |
2073 | level); | |
2074 | break; | |
2075 | case AUDIT_NOT_EQUAL: | |
2076 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2077 | level); | |
2078 | break; | |
2079 | case AUDIT_LESS_THAN: | |
2080 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], | |
2081 | level) && | |
2082 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2083 | level)); | |
2084 | break; | |
2085 | case AUDIT_LESS_THAN_OR_EQUAL: | |
2086 | match = mls_level_dom(&rule->au_ctxt.range.level[0], | |
2087 | level); | |
2088 | break; | |
2089 | case AUDIT_GREATER_THAN: | |
2090 | match = (mls_level_dom(level, | |
2091 | &rule->au_ctxt.range.level[0]) && | |
2092 | !mls_level_eq(level, | |
2093 | &rule->au_ctxt.range.level[0])); | |
2094 | break; | |
2095 | case AUDIT_GREATER_THAN_OR_EQUAL: | |
2096 | match = mls_level_dom(level, | |
2097 | &rule->au_ctxt.range.level[0]); | |
2098 | break; | |
2099 | } | |
2100 | } | |
2101 | ||
2102 | out: | |
2103 | POLICY_RDUNLOCK; | |
2104 | return match; | |
2105 | } | |
2106 | ||
2107 | static int (*aurule_callback)(void) = NULL; | |
2108 | ||
2109 | static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid, | |
2110 | u16 class, u32 perms, u32 *retained) | |
2111 | { | |
2112 | int err = 0; | |
2113 | ||
2114 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
2115 | err = aurule_callback(); | |
2116 | return err; | |
2117 | } | |
2118 | ||
2119 | static int __init aurule_init(void) | |
2120 | { | |
2121 | int err; | |
2122 | ||
2123 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET, | |
2124 | SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0); | |
2125 | if (err) | |
2126 | panic("avc_add_callback() failed, error %d\n", err); | |
2127 | ||
2128 | return err; | |
2129 | } | |
2130 | __initcall(aurule_init); | |
2131 | ||
2132 | void selinux_audit_set_callback(int (*callback)(void)) | |
2133 | { | |
2134 | aurule_callback = callback; | |
2135 | } |