Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Implementation of the security services. | |
3 | * | |
4 | * Authors : Stephen Smalley, <sds@epoch.ncsc.mil> | |
5d55a345 | 5 | * James Morris <jmorris@redhat.com> |
1da177e4 LT |
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 | * | |
5d55a345 | 14 | * Added conditional policy language extensions |
1da177e4 | 15 | * |
7420ed23 VY |
16 | * Updated: Hewlett-Packard <paul.moore@hp.com> |
17 | * | |
18 | * Added support for NetLabel | |
3bb56b25 | 19 | * Added support for the policy capability bitmap |
7420ed23 | 20 | * |
b94c7e67 CS |
21 | * Updated: Chad Sellers <csellers@tresys.com> |
22 | * | |
23 | * Added validation of kernel classes and permissions | |
24 | * | |
3bb56b25 | 25 | * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. |
376bd9cb | 26 | * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. |
b94c7e67 | 27 | * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC |
1da177e4 LT |
28 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> |
29 | * This program is free software; you can redistribute it and/or modify | |
5d55a345 | 30 | * it under the terms of the GNU General Public License as published by |
1da177e4 LT |
31 | * the Free Software Foundation, version 2. |
32 | */ | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/string.h> | |
36 | #include <linux/spinlock.h> | |
9f2ad665 | 37 | #include <linux/rcupdate.h> |
1da177e4 LT |
38 | #include <linux/errno.h> |
39 | #include <linux/in.h> | |
40 | #include <linux/sched.h> | |
41 | #include <linux/audit.h> | |
bb003079 | 42 | #include <linux/mutex.h> |
0e55a004 | 43 | #include <linux/selinux.h> |
7420ed23 | 44 | #include <net/netlabel.h> |
bb003079 | 45 | |
1da177e4 LT |
46 | #include "flask.h" |
47 | #include "avc.h" | |
48 | #include "avc_ss.h" | |
49 | #include "security.h" | |
50 | #include "context.h" | |
51 | #include "policydb.h" | |
52 | #include "sidtab.h" | |
53 | #include "services.h" | |
54 | #include "conditional.h" | |
55 | #include "mls.h" | |
7420ed23 | 56 | #include "objsec.h" |
c60475bf | 57 | #include "netlabel.h" |
3de4bab5 | 58 | #include "xfrm.h" |
02752760 | 59 | #include "ebitmap.h" |
9d57a7f9 | 60 | #include "audit.h" |
1da177e4 LT |
61 | |
62 | extern void selnl_notify_policyload(u32 seqno); | |
63 | unsigned int policydb_loaded_version; | |
64 | ||
3bb56b25 | 65 | int selinux_policycap_netpeer; |
b0c636b9 | 66 | int selinux_policycap_openperm; |
3bb56b25 | 67 | |
b94c7e67 CS |
68 | /* |
69 | * This is declared in avc.c | |
70 | */ | |
71 | extern const struct selinux_class_perm selinux_class_perm; | |
72 | ||
1da177e4 | 73 | static DEFINE_RWLOCK(policy_rwlock); |
1da177e4 LT |
74 | |
75 | static struct sidtab sidtab; | |
76 | struct policydb policydb; | |
5d55a345 | 77 | int ss_initialized; |
1da177e4 LT |
78 | |
79 | /* | |
80 | * The largest sequence number that has been used when | |
81 | * providing an access decision to the access vector cache. | |
82 | * The sequence number only changes when a policy change | |
83 | * occurs. | |
84 | */ | |
5d55a345 | 85 | static u32 latest_granting; |
1da177e4 LT |
86 | |
87 | /* Forward declaration. */ | |
88 | static int context_struct_to_string(struct context *context, char **scontext, | |
89 | u32 *scontext_len); | |
90 | ||
d9250dea KK |
91 | static int context_struct_compute_av(struct context *scontext, |
92 | struct context *tcontext, | |
93 | u16 tclass, | |
94 | u32 requested, | |
95 | struct av_decision *avd); | |
1da177e4 LT |
96 | /* |
97 | * Return the boolean value of a constraint expression | |
98 | * when it is applied to the specified source and target | |
99 | * security contexts. | |
100 | * | |
101 | * xcontext is a special beast... It is used by the validatetrans rules | |
102 | * only. For these rules, scontext is the context before the transition, | |
103 | * tcontext is the context after the transition, and xcontext is the context | |
104 | * of the process performing the transition. All other callers of | |
105 | * constraint_expr_eval should pass in NULL for xcontext. | |
106 | */ | |
107 | static int constraint_expr_eval(struct context *scontext, | |
108 | struct context *tcontext, | |
109 | struct context *xcontext, | |
110 | struct constraint_expr *cexpr) | |
111 | { | |
112 | u32 val1, val2; | |
113 | struct context *c; | |
114 | struct role_datum *r1, *r2; | |
115 | struct mls_level *l1, *l2; | |
116 | struct constraint_expr *e; | |
117 | int s[CEXPR_MAXDEPTH]; | |
118 | int sp = -1; | |
119 | ||
120 | for (e = cexpr; e; e = e->next) { | |
121 | switch (e->expr_type) { | |
122 | case CEXPR_NOT: | |
123 | BUG_ON(sp < 0); | |
124 | s[sp] = !s[sp]; | |
125 | break; | |
126 | case CEXPR_AND: | |
127 | BUG_ON(sp < 1); | |
128 | sp--; | |
129 | s[sp] &= s[sp+1]; | |
130 | break; | |
131 | case CEXPR_OR: | |
132 | BUG_ON(sp < 1); | |
133 | sp--; | |
134 | s[sp] |= s[sp+1]; | |
135 | break; | |
136 | case CEXPR_ATTR: | |
137 | if (sp == (CEXPR_MAXDEPTH-1)) | |
138 | return 0; | |
139 | switch (e->attr) { | |
140 | case CEXPR_USER: | |
141 | val1 = scontext->user; | |
142 | val2 = tcontext->user; | |
143 | break; | |
144 | case CEXPR_TYPE: | |
145 | val1 = scontext->type; | |
146 | val2 = tcontext->type; | |
147 | break; | |
148 | case CEXPR_ROLE: | |
149 | val1 = scontext->role; | |
150 | val2 = tcontext->role; | |
151 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
152 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
153 | switch (e->op) { | |
154 | case CEXPR_DOM: | |
155 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
156 | val2 - 1); | |
157 | continue; | |
158 | case CEXPR_DOMBY: | |
159 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
160 | val1 - 1); | |
161 | continue; | |
162 | case CEXPR_INCOMP: | |
5d55a345 EP |
163 | s[++sp] = (!ebitmap_get_bit(&r1->dominates, |
164 | val2 - 1) && | |
165 | !ebitmap_get_bit(&r2->dominates, | |
166 | val1 - 1)); | |
1da177e4 LT |
167 | continue; |
168 | default: | |
169 | break; | |
170 | } | |
171 | break; | |
172 | case CEXPR_L1L2: | |
173 | l1 = &(scontext->range.level[0]); | |
174 | l2 = &(tcontext->range.level[0]); | |
175 | goto mls_ops; | |
176 | case CEXPR_L1H2: | |
177 | l1 = &(scontext->range.level[0]); | |
178 | l2 = &(tcontext->range.level[1]); | |
179 | goto mls_ops; | |
180 | case CEXPR_H1L2: | |
181 | l1 = &(scontext->range.level[1]); | |
182 | l2 = &(tcontext->range.level[0]); | |
183 | goto mls_ops; | |
184 | case CEXPR_H1H2: | |
185 | l1 = &(scontext->range.level[1]); | |
186 | l2 = &(tcontext->range.level[1]); | |
187 | goto mls_ops; | |
188 | case CEXPR_L1H1: | |
189 | l1 = &(scontext->range.level[0]); | |
190 | l2 = &(scontext->range.level[1]); | |
191 | goto mls_ops; | |
192 | case CEXPR_L2H2: | |
193 | l1 = &(tcontext->range.level[0]); | |
194 | l2 = &(tcontext->range.level[1]); | |
195 | goto mls_ops; | |
196 | mls_ops: | |
197 | switch (e->op) { | |
198 | case CEXPR_EQ: | |
199 | s[++sp] = mls_level_eq(l1, l2); | |
200 | continue; | |
201 | case CEXPR_NEQ: | |
202 | s[++sp] = !mls_level_eq(l1, l2); | |
203 | continue; | |
204 | case CEXPR_DOM: | |
205 | s[++sp] = mls_level_dom(l1, l2); | |
206 | continue; | |
207 | case CEXPR_DOMBY: | |
208 | s[++sp] = mls_level_dom(l2, l1); | |
209 | continue; | |
210 | case CEXPR_INCOMP: | |
211 | s[++sp] = mls_level_incomp(l2, l1); | |
212 | continue; | |
213 | default: | |
214 | BUG(); | |
215 | return 0; | |
216 | } | |
217 | break; | |
218 | default: | |
219 | BUG(); | |
220 | return 0; | |
221 | } | |
222 | ||
223 | switch (e->op) { | |
224 | case CEXPR_EQ: | |
225 | s[++sp] = (val1 == val2); | |
226 | break; | |
227 | case CEXPR_NEQ: | |
228 | s[++sp] = (val1 != val2); | |
229 | break; | |
230 | default: | |
231 | BUG(); | |
232 | return 0; | |
233 | } | |
234 | break; | |
235 | case CEXPR_NAMES: | |
236 | if (sp == (CEXPR_MAXDEPTH-1)) | |
237 | return 0; | |
238 | c = scontext; | |
239 | if (e->attr & CEXPR_TARGET) | |
240 | c = tcontext; | |
241 | else if (e->attr & CEXPR_XTARGET) { | |
242 | c = xcontext; | |
243 | if (!c) { | |
244 | BUG(); | |
245 | return 0; | |
246 | } | |
247 | } | |
248 | if (e->attr & CEXPR_USER) | |
249 | val1 = c->user; | |
250 | else if (e->attr & CEXPR_ROLE) | |
251 | val1 = c->role; | |
252 | else if (e->attr & CEXPR_TYPE) | |
253 | val1 = c->type; | |
254 | else { | |
255 | BUG(); | |
256 | return 0; | |
257 | } | |
258 | ||
259 | switch (e->op) { | |
260 | case CEXPR_EQ: | |
261 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
262 | break; | |
263 | case CEXPR_NEQ: | |
264 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
265 | break; | |
266 | default: | |
267 | BUG(); | |
268 | return 0; | |
269 | } | |
270 | break; | |
271 | default: | |
272 | BUG(); | |
273 | return 0; | |
274 | } | |
275 | } | |
276 | ||
277 | BUG_ON(sp != 0); | |
278 | return s[0]; | |
279 | } | |
280 | ||
d9250dea KK |
281 | /* |
282 | * security_boundary_permission - drops violated permissions | |
283 | * on boundary constraint. | |
284 | */ | |
285 | static void type_attribute_bounds_av(struct context *scontext, | |
286 | struct context *tcontext, | |
287 | u16 tclass, | |
288 | u32 requested, | |
289 | struct av_decision *avd) | |
290 | { | |
291 | struct context lo_scontext; | |
292 | struct context lo_tcontext; | |
293 | struct av_decision lo_avd; | |
294 | struct type_datum *source | |
295 | = policydb.type_val_to_struct[scontext->type - 1]; | |
296 | struct type_datum *target | |
297 | = policydb.type_val_to_struct[tcontext->type - 1]; | |
298 | u32 masked = 0; | |
299 | ||
300 | if (source->bounds) { | |
301 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
302 | ||
303 | memcpy(&lo_scontext, scontext, sizeof(lo_scontext)); | |
304 | lo_scontext.type = source->bounds; | |
305 | ||
306 | context_struct_compute_av(&lo_scontext, | |
307 | tcontext, | |
308 | tclass, | |
309 | requested, | |
310 | &lo_avd); | |
311 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
312 | return; /* no masked permission */ | |
313 | masked = ~lo_avd.allowed & avd->allowed; | |
314 | } | |
315 | ||
316 | if (target->bounds) { | |
317 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
318 | ||
319 | memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext)); | |
320 | lo_tcontext.type = target->bounds; | |
321 | ||
322 | context_struct_compute_av(scontext, | |
323 | &lo_tcontext, | |
324 | tclass, | |
325 | requested, | |
326 | &lo_avd); | |
327 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
328 | return; /* no masked permission */ | |
329 | masked = ~lo_avd.allowed & avd->allowed; | |
330 | } | |
331 | ||
332 | if (source->bounds && target->bounds) { | |
333 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
334 | /* | |
335 | * lo_scontext and lo_tcontext are already | |
336 | * set up. | |
337 | */ | |
338 | ||
339 | context_struct_compute_av(&lo_scontext, | |
340 | &lo_tcontext, | |
341 | tclass, | |
342 | requested, | |
343 | &lo_avd); | |
344 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
345 | return; /* no masked permission */ | |
346 | masked = ~lo_avd.allowed & avd->allowed; | |
347 | } | |
348 | ||
349 | if (masked) { | |
350 | struct audit_buffer *ab; | |
351 | char *stype_name | |
352 | = policydb.p_type_val_to_name[source->value - 1]; | |
353 | char *ttype_name | |
354 | = policydb.p_type_val_to_name[target->value - 1]; | |
355 | char *tclass_name | |
356 | = policydb.p_class_val_to_name[tclass - 1]; | |
357 | ||
358 | /* mask violated permissions */ | |
359 | avd->allowed &= ~masked; | |
360 | ||
361 | /* notice to userspace via audit message */ | |
362 | ab = audit_log_start(current->audit_context, | |
363 | GFP_ATOMIC, AUDIT_SELINUX_ERR); | |
364 | if (!ab) | |
365 | return; | |
366 | ||
367 | audit_log_format(ab, "av boundary violation: " | |
368 | "source=%s target=%s tclass=%s", | |
369 | stype_name, ttype_name, tclass_name); | |
370 | avc_dump_av(ab, tclass, masked); | |
371 | audit_log_end(ab); | |
372 | } | |
373 | } | |
374 | ||
1da177e4 LT |
375 | /* |
376 | * Compute access vectors based on a context structure pair for | |
377 | * the permissions in a particular class. | |
378 | */ | |
379 | static int context_struct_compute_av(struct context *scontext, | |
380 | struct context *tcontext, | |
381 | u16 tclass, | |
382 | u32 requested, | |
383 | struct av_decision *avd) | |
384 | { | |
385 | struct constraint_node *constraint; | |
386 | struct role_allow *ra; | |
387 | struct avtab_key avkey; | |
782ebb99 | 388 | struct avtab_node *node; |
1da177e4 | 389 | struct class_datum *tclass_datum; |
782ebb99 SS |
390 | struct ebitmap *sattr, *tattr; |
391 | struct ebitmap_node *snode, *tnode; | |
3f12070e | 392 | const struct selinux_class_perm *kdefs = &selinux_class_perm; |
782ebb99 | 393 | unsigned int i, j; |
1da177e4 LT |
394 | |
395 | /* | |
396 | * Remap extended Netlink classes for old policy versions. | |
397 | * Do this here rather than socket_type_to_security_class() | |
398 | * in case a newer policy version is loaded, allowing sockets | |
399 | * to remain in the correct class. | |
400 | */ | |
401 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
402 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
403 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
404 | tclass = SECCLASS_NETLINK_SOCKET; | |
405 | ||
1da177e4 LT |
406 | /* |
407 | * Initialize the access vectors to the default values. | |
408 | */ | |
409 | avd->allowed = 0; | |
410 | avd->decided = 0xffffffff; | |
411 | avd->auditallow = 0; | |
412 | avd->auditdeny = 0xffffffff; | |
413 | avd->seqno = latest_granting; | |
414 | ||
3f12070e EP |
415 | /* |
416 | * Check for all the invalid cases. | |
417 | * - tclass 0 | |
418 | * - tclass > policy and > kernel | |
419 | * - tclass > policy but is a userspace class | |
420 | * - tclass > policy but we do not allow unknowns | |
421 | */ | |
422 | if (unlikely(!tclass)) | |
423 | goto inval_class; | |
424 | if (unlikely(tclass > policydb.p_classes.nprim)) | |
425 | if (tclass > kdefs->cts_len || | |
cea78dc4 | 426 | !kdefs->class_to_string[tclass] || |
3f12070e EP |
427 | !policydb.allow_unknown) |
428 | goto inval_class; | |
429 | ||
430 | /* | |
431 | * Kernel class and we allow unknown so pad the allow decision | |
432 | * the pad will be all 1 for unknown classes. | |
433 | */ | |
434 | if (tclass <= kdefs->cts_len && policydb.allow_unknown) | |
435 | avd->allowed = policydb.undefined_perms[tclass - 1]; | |
436 | ||
437 | /* | |
438 | * Not in policy. Since decision is completed (all 1 or all 0) return. | |
439 | */ | |
440 | if (unlikely(tclass > policydb.p_classes.nprim)) | |
441 | return 0; | |
442 | ||
443 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
444 | ||
1da177e4 LT |
445 | /* |
446 | * If a specific type enforcement rule was defined for | |
447 | * this permission check, then use it. | |
448 | */ | |
1da177e4 | 449 | avkey.target_class = tclass; |
782ebb99 SS |
450 | avkey.specified = AVTAB_AV; |
451 | sattr = &policydb.type_attr_map[scontext->type - 1]; | |
452 | tattr = &policydb.type_attr_map[tcontext->type - 1]; | |
9fe79ad1 KK |
453 | ebitmap_for_each_positive_bit(sattr, snode, i) { |
454 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
782ebb99 SS |
455 | avkey.source_type = i + 1; |
456 | avkey.target_type = j + 1; | |
457 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
dbc74c65 | 458 | node; |
782ebb99 SS |
459 | node = avtab_search_node_next(node, avkey.specified)) { |
460 | if (node->key.specified == AVTAB_ALLOWED) | |
461 | avd->allowed |= node->datum.data; | |
462 | else if (node->key.specified == AVTAB_AUDITALLOW) | |
463 | avd->auditallow |= node->datum.data; | |
464 | else if (node->key.specified == AVTAB_AUDITDENY) | |
465 | avd->auditdeny &= node->datum.data; | |
466 | } | |
1da177e4 | 467 | |
782ebb99 SS |
468 | /* Check conditional av table for additional permissions */ |
469 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); | |
470 | ||
471 | } | |
472 | } | |
1da177e4 LT |
473 | |
474 | /* | |
475 | * Remove any permissions prohibited by a constraint (this includes | |
476 | * the MLS policy). | |
477 | */ | |
478 | constraint = tclass_datum->constraints; | |
479 | while (constraint) { | |
480 | if ((constraint->permissions & (avd->allowed)) && | |
481 | !constraint_expr_eval(scontext, tcontext, NULL, | |
482 | constraint->expr)) { | |
483 | avd->allowed = (avd->allowed) & ~(constraint->permissions); | |
484 | } | |
485 | constraint = constraint->next; | |
486 | } | |
487 | ||
488 | /* | |
489 | * If checking process transition permission and the | |
490 | * role is changing, then check the (current_role, new_role) | |
491 | * pair. | |
492 | */ | |
493 | if (tclass == SECCLASS_PROCESS && | |
494 | (avd->allowed & (PROCESS__TRANSITION | PROCESS__DYNTRANSITION)) && | |
495 | scontext->role != tcontext->role) { | |
496 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
497 | if (scontext->role == ra->role && | |
498 | tcontext->role == ra->new_role) | |
499 | break; | |
500 | } | |
501 | if (!ra) | |
502 | avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION | | |
5d55a345 | 503 | PROCESS__DYNTRANSITION); |
1da177e4 LT |
504 | } |
505 | ||
d9250dea KK |
506 | /* |
507 | * If the given source and target types have boundary | |
508 | * constraint, lazy checks have to mask any violated | |
509 | * permission and notice it to userspace via audit. | |
510 | */ | |
511 | type_attribute_bounds_av(scontext, tcontext, | |
512 | tclass, requested, avd); | |
513 | ||
1da177e4 | 514 | return 0; |
3f12070e EP |
515 | |
516 | inval_class: | |
22df4adb SS |
517 | if (!tclass || tclass > kdefs->cts_len || |
518 | !kdefs->class_to_string[tclass]) { | |
519 | if (printk_ratelimit()) | |
520 | printk(KERN_ERR "SELinux: %s: unrecognized class %d\n", | |
521 | __func__, tclass); | |
522 | return -EINVAL; | |
523 | } | |
524 | ||
525 | /* | |
526 | * Known to the kernel, but not to the policy. | |
527 | * Handle as a denial (allowed is 0). | |
528 | */ | |
529 | return 0; | |
1da177e4 LT |
530 | } |
531 | ||
64dbf074 EP |
532 | /* |
533 | * Given a sid find if the type has the permissive flag set | |
534 | */ | |
535 | int security_permissive_sid(u32 sid) | |
536 | { | |
537 | struct context *context; | |
538 | u32 type; | |
539 | int rc; | |
540 | ||
0804d113 | 541 | read_lock(&policy_rwlock); |
64dbf074 EP |
542 | |
543 | context = sidtab_search(&sidtab, sid); | |
544 | BUG_ON(!context); | |
545 | ||
546 | type = context->type; | |
547 | /* | |
548 | * we are intentionally using type here, not type-1, the 0th bit may | |
549 | * someday indicate that we are globally setting permissive in policy. | |
550 | */ | |
551 | rc = ebitmap_get_bit(&policydb.permissive_map, type); | |
552 | ||
0804d113 | 553 | read_unlock(&policy_rwlock); |
64dbf074 EP |
554 | return rc; |
555 | } | |
556 | ||
1da177e4 | 557 | static int security_validtrans_handle_fail(struct context *ocontext, |
5d55a345 EP |
558 | struct context *ncontext, |
559 | struct context *tcontext, | |
560 | u16 tclass) | |
1da177e4 LT |
561 | { |
562 | char *o = NULL, *n = NULL, *t = NULL; | |
563 | u32 olen, nlen, tlen; | |
564 | ||
565 | if (context_struct_to_string(ocontext, &o, &olen) < 0) | |
566 | goto out; | |
567 | if (context_struct_to_string(ncontext, &n, &nlen) < 0) | |
568 | goto out; | |
569 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
570 | goto out; | |
9ad9ad38 | 571 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
5d55a345 EP |
572 | "security_validate_transition: denied for" |
573 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", | |
574 | o, n, t, policydb.p_class_val_to_name[tclass-1]); | |
1da177e4 LT |
575 | out: |
576 | kfree(o); | |
577 | kfree(n); | |
578 | kfree(t); | |
579 | ||
580 | if (!selinux_enforcing) | |
581 | return 0; | |
582 | return -EPERM; | |
583 | } | |
584 | ||
585 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
5d55a345 | 586 | u16 tclass) |
1da177e4 LT |
587 | { |
588 | struct context *ocontext; | |
589 | struct context *ncontext; | |
590 | struct context *tcontext; | |
591 | struct class_datum *tclass_datum; | |
592 | struct constraint_node *constraint; | |
593 | int rc = 0; | |
594 | ||
595 | if (!ss_initialized) | |
596 | return 0; | |
597 | ||
0804d113 | 598 | read_lock(&policy_rwlock); |
1da177e4 LT |
599 | |
600 | /* | |
601 | * Remap extended Netlink classes for old policy versions. | |
602 | * Do this here rather than socket_type_to_security_class() | |
603 | * in case a newer policy version is loaded, allowing sockets | |
604 | * to remain in the correct class. | |
605 | */ | |
606 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
607 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
608 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
609 | tclass = SECCLASS_NETLINK_SOCKET; | |
610 | ||
611 | if (!tclass || tclass > policydb.p_classes.nprim) { | |
744ba35e EP |
612 | printk(KERN_ERR "SELinux: %s: unrecognized class %d\n", |
613 | __func__, tclass); | |
1da177e4 LT |
614 | rc = -EINVAL; |
615 | goto out; | |
616 | } | |
617 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
618 | ||
619 | ocontext = sidtab_search(&sidtab, oldsid); | |
620 | if (!ocontext) { | |
744ba35e EP |
621 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
622 | __func__, oldsid); | |
1da177e4 LT |
623 | rc = -EINVAL; |
624 | goto out; | |
625 | } | |
626 | ||
627 | ncontext = sidtab_search(&sidtab, newsid); | |
628 | if (!ncontext) { | |
744ba35e EP |
629 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
630 | __func__, newsid); | |
1da177e4 LT |
631 | rc = -EINVAL; |
632 | goto out; | |
633 | } | |
634 | ||
635 | tcontext = sidtab_search(&sidtab, tasksid); | |
636 | if (!tcontext) { | |
744ba35e EP |
637 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
638 | __func__, tasksid); | |
1da177e4 LT |
639 | rc = -EINVAL; |
640 | goto out; | |
641 | } | |
642 | ||
643 | constraint = tclass_datum->validatetrans; | |
644 | while (constraint) { | |
645 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
5d55a345 | 646 | constraint->expr)) { |
1da177e4 | 647 | rc = security_validtrans_handle_fail(ocontext, ncontext, |
5d55a345 | 648 | tcontext, tclass); |
1da177e4 LT |
649 | goto out; |
650 | } | |
651 | constraint = constraint->next; | |
652 | } | |
653 | ||
654 | out: | |
0804d113 | 655 | read_unlock(&policy_rwlock); |
1da177e4 LT |
656 | return rc; |
657 | } | |
658 | ||
d9250dea KK |
659 | /* |
660 | * security_bounded_transition - check whether the given | |
661 | * transition is directed to bounded, or not. | |
662 | * It returns 0, if @newsid is bounded by @oldsid. | |
663 | * Otherwise, it returns error code. | |
664 | * | |
665 | * @oldsid : current security identifier | |
666 | * @newsid : destinated security identifier | |
667 | */ | |
668 | int security_bounded_transition(u32 old_sid, u32 new_sid) | |
669 | { | |
670 | struct context *old_context, *new_context; | |
671 | struct type_datum *type; | |
672 | int index; | |
673 | int rc = -EINVAL; | |
674 | ||
675 | read_lock(&policy_rwlock); | |
676 | ||
677 | old_context = sidtab_search(&sidtab, old_sid); | |
678 | if (!old_context) { | |
679 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
680 | __func__, old_sid); | |
681 | goto out; | |
682 | } | |
683 | ||
684 | new_context = sidtab_search(&sidtab, new_sid); | |
685 | if (!new_context) { | |
686 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
687 | __func__, new_sid); | |
688 | goto out; | |
689 | } | |
690 | ||
691 | /* type/domain unchaned */ | |
692 | if (old_context->type == new_context->type) { | |
693 | rc = 0; | |
694 | goto out; | |
695 | } | |
696 | ||
697 | index = new_context->type; | |
698 | while (true) { | |
699 | type = policydb.type_val_to_struct[index - 1]; | |
700 | BUG_ON(!type); | |
701 | ||
702 | /* not bounded anymore */ | |
703 | if (!type->bounds) { | |
704 | rc = -EPERM; | |
705 | break; | |
706 | } | |
707 | ||
708 | /* @newsid is bounded by @oldsid */ | |
709 | if (type->bounds == old_context->type) { | |
710 | rc = 0; | |
711 | break; | |
712 | } | |
713 | index = type->bounds; | |
714 | } | |
715 | out: | |
716 | read_unlock(&policy_rwlock); | |
717 | ||
718 | return rc; | |
719 | } | |
720 | ||
721 | ||
1da177e4 LT |
722 | /** |
723 | * security_compute_av - Compute access vector decisions. | |
724 | * @ssid: source security identifier | |
725 | * @tsid: target security identifier | |
726 | * @tclass: target security class | |
727 | * @requested: requested permissions | |
728 | * @avd: access vector decisions | |
729 | * | |
730 | * Compute a set of access vector decisions based on the | |
731 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
732 | * Return -%EINVAL if any of the parameters are invalid or %0 | |
733 | * if the access vector decisions were computed successfully. | |
734 | */ | |
735 | int security_compute_av(u32 ssid, | |
736 | u32 tsid, | |
737 | u16 tclass, | |
738 | u32 requested, | |
739 | struct av_decision *avd) | |
740 | { | |
741 | struct context *scontext = NULL, *tcontext = NULL; | |
742 | int rc = 0; | |
743 | ||
744 | if (!ss_initialized) { | |
4c443d1b SS |
745 | avd->allowed = 0xffffffff; |
746 | avd->decided = 0xffffffff; | |
1da177e4 LT |
747 | avd->auditallow = 0; |
748 | avd->auditdeny = 0xffffffff; | |
749 | avd->seqno = latest_granting; | |
750 | return 0; | |
751 | } | |
752 | ||
0804d113 | 753 | read_lock(&policy_rwlock); |
1da177e4 LT |
754 | |
755 | scontext = sidtab_search(&sidtab, ssid); | |
756 | if (!scontext) { | |
744ba35e EP |
757 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
758 | __func__, ssid); | |
1da177e4 LT |
759 | rc = -EINVAL; |
760 | goto out; | |
761 | } | |
762 | tcontext = sidtab_search(&sidtab, tsid); | |
763 | if (!tcontext) { | |
744ba35e EP |
764 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
765 | __func__, tsid); | |
1da177e4 LT |
766 | rc = -EINVAL; |
767 | goto out; | |
768 | } | |
769 | ||
770 | rc = context_struct_compute_av(scontext, tcontext, tclass, | |
771 | requested, avd); | |
772 | out: | |
0804d113 | 773 | read_unlock(&policy_rwlock); |
1da177e4 LT |
774 | return rc; |
775 | } | |
776 | ||
777 | /* | |
778 | * Write the security context string representation of | |
779 | * the context structure `context' into a dynamically | |
780 | * allocated string of the correct size. Set `*scontext' | |
781 | * to point to this string and set `*scontext_len' to | |
782 | * the length of the string. | |
783 | */ | |
784 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
785 | { | |
786 | char *scontextp; | |
787 | ||
788 | *scontext = NULL; | |
789 | *scontext_len = 0; | |
790 | ||
12b29f34 SS |
791 | if (context->len) { |
792 | *scontext_len = context->len; | |
793 | *scontext = kstrdup(context->str, GFP_ATOMIC); | |
794 | if (!(*scontext)) | |
795 | return -ENOMEM; | |
796 | return 0; | |
797 | } | |
798 | ||
1da177e4 LT |
799 | /* Compute the size of the context. */ |
800 | *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; | |
801 | *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; | |
802 | *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; | |
803 | *scontext_len += mls_compute_context_len(context); | |
804 | ||
805 | /* Allocate space for the context; caller must free this space. */ | |
806 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
5d55a345 | 807 | if (!scontextp) |
1da177e4 | 808 | return -ENOMEM; |
1da177e4 LT |
809 | *scontext = scontextp; |
810 | ||
811 | /* | |
812 | * Copy the user name, role name and type name into the context. | |
813 | */ | |
814 | sprintf(scontextp, "%s:%s:%s", | |
815 | policydb.p_user_val_to_name[context->user - 1], | |
816 | policydb.p_role_val_to_name[context->role - 1], | |
817 | policydb.p_type_val_to_name[context->type - 1]); | |
818 | scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + | |
5d55a345 EP |
819 | 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + |
820 | 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); | |
1da177e4 LT |
821 | |
822 | mls_sid_to_context(context, &scontextp); | |
823 | ||
824 | *scontextp = 0; | |
825 | ||
826 | return 0; | |
827 | } | |
828 | ||
829 | #include "initial_sid_to_string.h" | |
830 | ||
f0ee2e46 JC |
831 | const char *security_get_initial_sid_context(u32 sid) |
832 | { | |
833 | if (unlikely(sid > SECINITSID_NUM)) | |
834 | return NULL; | |
835 | return initial_sid_to_string[sid]; | |
836 | } | |
837 | ||
12b29f34 SS |
838 | static int security_sid_to_context_core(u32 sid, char **scontext, |
839 | u32 *scontext_len, int force) | |
1da177e4 LT |
840 | { |
841 | struct context *context; | |
842 | int rc = 0; | |
843 | ||
4f4acf3a SS |
844 | *scontext = NULL; |
845 | *scontext_len = 0; | |
846 | ||
1da177e4 LT |
847 | if (!ss_initialized) { |
848 | if (sid <= SECINITSID_NUM) { | |
849 | char *scontextp; | |
850 | ||
851 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
5d55a345 | 852 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); |
0cccca06 SH |
853 | if (!scontextp) { |
854 | rc = -ENOMEM; | |
855 | goto out; | |
856 | } | |
1da177e4 LT |
857 | strcpy(scontextp, initial_sid_to_string[sid]); |
858 | *scontext = scontextp; | |
859 | goto out; | |
860 | } | |
744ba35e EP |
861 | printk(KERN_ERR "SELinux: %s: called before initial " |
862 | "load_policy on unknown SID %d\n", __func__, sid); | |
1da177e4 LT |
863 | rc = -EINVAL; |
864 | goto out; | |
865 | } | |
0804d113 | 866 | read_lock(&policy_rwlock); |
12b29f34 SS |
867 | if (force) |
868 | context = sidtab_search_force(&sidtab, sid); | |
869 | else | |
870 | context = sidtab_search(&sidtab, sid); | |
1da177e4 | 871 | if (!context) { |
744ba35e EP |
872 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
873 | __func__, sid); | |
1da177e4 LT |
874 | rc = -EINVAL; |
875 | goto out_unlock; | |
876 | } | |
877 | rc = context_struct_to_string(context, scontext, scontext_len); | |
878 | out_unlock: | |
0804d113 | 879 | read_unlock(&policy_rwlock); |
1da177e4 LT |
880 | out: |
881 | return rc; | |
882 | ||
883 | } | |
884 | ||
12b29f34 SS |
885 | /** |
886 | * security_sid_to_context - Obtain a context for a given SID. | |
887 | * @sid: security identifier, SID | |
888 | * @scontext: security context | |
889 | * @scontext_len: length in bytes | |
890 | * | |
891 | * Write the string representation of the context associated with @sid | |
892 | * into a dynamically allocated string of the correct size. Set @scontext | |
893 | * to point to this string and set @scontext_len to the length of the string. | |
894 | */ | |
895 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
1da177e4 | 896 | { |
12b29f34 SS |
897 | return security_sid_to_context_core(sid, scontext, scontext_len, 0); |
898 | } | |
899 | ||
900 | int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len) | |
901 | { | |
902 | return security_sid_to_context_core(sid, scontext, scontext_len, 1); | |
903 | } | |
904 | ||
9a59daa0 SS |
905 | /* |
906 | * Caveat: Mutates scontext. | |
907 | */ | |
12b29f34 SS |
908 | static int string_to_context_struct(struct policydb *pol, |
909 | struct sidtab *sidtabp, | |
9a59daa0 | 910 | char *scontext, |
12b29f34 SS |
911 | u32 scontext_len, |
912 | struct context *ctx, | |
9a59daa0 | 913 | u32 def_sid) |
12b29f34 | 914 | { |
1da177e4 LT |
915 | struct role_datum *role; |
916 | struct type_datum *typdatum; | |
917 | struct user_datum *usrdatum; | |
918 | char *scontextp, *p, oldc; | |
919 | int rc = 0; | |
920 | ||
12b29f34 | 921 | context_init(ctx); |
1da177e4 | 922 | |
1da177e4 LT |
923 | /* Parse the security context. */ |
924 | ||
925 | rc = -EINVAL; | |
9a59daa0 | 926 | scontextp = (char *) scontext; |
1da177e4 LT |
927 | |
928 | /* Extract the user. */ | |
929 | p = scontextp; | |
930 | while (*p && *p != ':') | |
931 | p++; | |
932 | ||
933 | if (*p == 0) | |
12b29f34 | 934 | goto out; |
1da177e4 LT |
935 | |
936 | *p++ = 0; | |
937 | ||
12b29f34 | 938 | usrdatum = hashtab_search(pol->p_users.table, scontextp); |
1da177e4 | 939 | if (!usrdatum) |
12b29f34 | 940 | goto out; |
1da177e4 | 941 | |
12b29f34 | 942 | ctx->user = usrdatum->value; |
1da177e4 LT |
943 | |
944 | /* Extract role. */ | |
945 | scontextp = p; | |
946 | while (*p && *p != ':') | |
947 | p++; | |
948 | ||
949 | if (*p == 0) | |
12b29f34 | 950 | goto out; |
1da177e4 LT |
951 | |
952 | *p++ = 0; | |
953 | ||
12b29f34 | 954 | role = hashtab_search(pol->p_roles.table, scontextp); |
1da177e4 | 955 | if (!role) |
12b29f34 SS |
956 | goto out; |
957 | ctx->role = role->value; | |
1da177e4 LT |
958 | |
959 | /* Extract type. */ | |
960 | scontextp = p; | |
961 | while (*p && *p != ':') | |
962 | p++; | |
963 | oldc = *p; | |
964 | *p++ = 0; | |
965 | ||
12b29f34 | 966 | typdatum = hashtab_search(pol->p_types.table, scontextp); |
d9250dea | 967 | if (!typdatum || typdatum->attribute) |
12b29f34 | 968 | goto out; |
1da177e4 | 969 | |
12b29f34 | 970 | ctx->type = typdatum->value; |
1da177e4 | 971 | |
12b29f34 | 972 | rc = mls_context_to_sid(pol, oldc, &p, ctx, sidtabp, def_sid); |
1da177e4 | 973 | if (rc) |
12b29f34 | 974 | goto out; |
1da177e4 | 975 | |
9a59daa0 | 976 | if ((p - scontext) < scontext_len) { |
1da177e4 | 977 | rc = -EINVAL; |
12b29f34 | 978 | goto out; |
1da177e4 LT |
979 | } |
980 | ||
981 | /* Check the validity of the new context. */ | |
12b29f34 | 982 | if (!policydb_context_isvalid(pol, ctx)) { |
1da177e4 | 983 | rc = -EINVAL; |
12b29f34 | 984 | goto out; |
1da177e4 | 985 | } |
12b29f34 SS |
986 | rc = 0; |
987 | out: | |
8e531af9 EP |
988 | if (rc) |
989 | context_destroy(ctx); | |
12b29f34 SS |
990 | return rc; |
991 | } | |
992 | ||
993 | static int security_context_to_sid_core(const char *scontext, u32 scontext_len, | |
994 | u32 *sid, u32 def_sid, gfp_t gfp_flags, | |
995 | int force) | |
996 | { | |
9a59daa0 | 997 | char *scontext2, *str = NULL; |
12b29f34 SS |
998 | struct context context; |
999 | int rc = 0; | |
1000 | ||
1001 | if (!ss_initialized) { | |
1002 | int i; | |
1003 | ||
1004 | for (i = 1; i < SECINITSID_NUM; i++) { | |
1005 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
1006 | *sid = i; | |
9a59daa0 | 1007 | return 0; |
12b29f34 SS |
1008 | } |
1009 | } | |
1010 | *sid = SECINITSID_KERNEL; | |
9a59daa0 | 1011 | return 0; |
12b29f34 SS |
1012 | } |
1013 | *sid = SECSID_NULL; | |
1014 | ||
9a59daa0 SS |
1015 | /* Copy the string so that we can modify the copy as we parse it. */ |
1016 | scontext2 = kmalloc(scontext_len+1, gfp_flags); | |
1017 | if (!scontext2) | |
1018 | return -ENOMEM; | |
1019 | memcpy(scontext2, scontext, scontext_len); | |
1020 | scontext2[scontext_len] = 0; | |
1021 | ||
1022 | if (force) { | |
1023 | /* Save another copy for storing in uninterpreted form */ | |
1024 | str = kstrdup(scontext2, gfp_flags); | |
1025 | if (!str) { | |
1026 | kfree(scontext2); | |
1027 | return -ENOMEM; | |
1028 | } | |
1029 | } | |
1030 | ||
0804d113 | 1031 | read_lock(&policy_rwlock); |
12b29f34 | 1032 | rc = string_to_context_struct(&policydb, &sidtab, |
9a59daa0 SS |
1033 | scontext2, scontext_len, |
1034 | &context, def_sid); | |
12b29f34 | 1035 | if (rc == -EINVAL && force) { |
9a59daa0 | 1036 | context.str = str; |
12b29f34 | 1037 | context.len = scontext_len; |
9a59daa0 | 1038 | str = NULL; |
12b29f34 SS |
1039 | } else if (rc) |
1040 | goto out; | |
1041 | rc = sidtab_context_to_sid(&sidtab, &context, sid); | |
8e531af9 | 1042 | context_destroy(&context); |
1da177e4 | 1043 | out: |
0804d113 | 1044 | read_unlock(&policy_rwlock); |
9a59daa0 SS |
1045 | kfree(scontext2); |
1046 | kfree(str); | |
1da177e4 LT |
1047 | return rc; |
1048 | } | |
1049 | ||
f5c1d5b2 JM |
1050 | /** |
1051 | * security_context_to_sid - Obtain a SID for a given security context. | |
1052 | * @scontext: security context | |
1053 | * @scontext_len: length in bytes | |
1054 | * @sid: security identifier, SID | |
1055 | * | |
1056 | * Obtains a SID associated with the security context that | |
1057 | * has the string representation specified by @scontext. | |
1058 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
1059 | * memory is available, or 0 on success. | |
1060 | */ | |
8f0cfa52 | 1061 | int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid) |
f5c1d5b2 JM |
1062 | { |
1063 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 | 1064 | sid, SECSID_NULL, GFP_KERNEL, 0); |
f5c1d5b2 JM |
1065 | } |
1066 | ||
1067 | /** | |
1068 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
1069 | * falling back to specified default if needed. | |
1070 | * | |
1071 | * @scontext: security context | |
1072 | * @scontext_len: length in bytes | |
1073 | * @sid: security identifier, SID | |
d133a960 | 1074 | * @def_sid: default SID to assign on error |
f5c1d5b2 JM |
1075 | * |
1076 | * Obtains a SID associated with the security context that | |
1077 | * has the string representation specified by @scontext. | |
1078 | * The default SID is passed to the MLS layer to be used to allow | |
1079 | * kernel labeling of the MLS field if the MLS field is not present | |
1080 | * (for upgrading to MLS without full relabel). | |
12b29f34 | 1081 | * Implicitly forces adding of the context even if it cannot be mapped yet. |
f5c1d5b2 JM |
1082 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient |
1083 | * memory is available, or 0 on success. | |
1084 | */ | |
7bf570dc DH |
1085 | int security_context_to_sid_default(const char *scontext, u32 scontext_len, |
1086 | u32 *sid, u32 def_sid, gfp_t gfp_flags) | |
f5c1d5b2 JM |
1087 | { |
1088 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 SS |
1089 | sid, def_sid, gfp_flags, 1); |
1090 | } | |
1091 | ||
1092 | int security_context_to_sid_force(const char *scontext, u32 scontext_len, | |
1093 | u32 *sid) | |
1094 | { | |
1095 | return security_context_to_sid_core(scontext, scontext_len, | |
1096 | sid, SECSID_NULL, GFP_KERNEL, 1); | |
f5c1d5b2 JM |
1097 | } |
1098 | ||
1da177e4 LT |
1099 | static int compute_sid_handle_invalid_context( |
1100 | struct context *scontext, | |
1101 | struct context *tcontext, | |
1102 | u16 tclass, | |
1103 | struct context *newcontext) | |
1104 | { | |
1105 | char *s = NULL, *t = NULL, *n = NULL; | |
1106 | u32 slen, tlen, nlen; | |
1107 | ||
1108 | if (context_struct_to_string(scontext, &s, &slen) < 0) | |
1109 | goto out; | |
1110 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
1111 | goto out; | |
1112 | if (context_struct_to_string(newcontext, &n, &nlen) < 0) | |
1113 | goto out; | |
9ad9ad38 | 1114 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
1115 | "security_compute_sid: invalid context %s" |
1116 | " for scontext=%s" | |
1117 | " tcontext=%s" | |
1118 | " tclass=%s", | |
1119 | n, s, t, policydb.p_class_val_to_name[tclass-1]); | |
1120 | out: | |
1121 | kfree(s); | |
1122 | kfree(t); | |
1123 | kfree(n); | |
1124 | if (!selinux_enforcing) | |
1125 | return 0; | |
1126 | return -EACCES; | |
1127 | } | |
1128 | ||
1129 | static int security_compute_sid(u32 ssid, | |
1130 | u32 tsid, | |
1131 | u16 tclass, | |
1132 | u32 specified, | |
1133 | u32 *out_sid) | |
1134 | { | |
1135 | struct context *scontext = NULL, *tcontext = NULL, newcontext; | |
1136 | struct role_trans *roletr = NULL; | |
1137 | struct avtab_key avkey; | |
1138 | struct avtab_datum *avdatum; | |
1139 | struct avtab_node *node; | |
1da177e4 LT |
1140 | int rc = 0; |
1141 | ||
1142 | if (!ss_initialized) { | |
1143 | switch (tclass) { | |
1144 | case SECCLASS_PROCESS: | |
1145 | *out_sid = ssid; | |
1146 | break; | |
1147 | default: | |
1148 | *out_sid = tsid; | |
1149 | break; | |
1150 | } | |
1151 | goto out; | |
1152 | } | |
1153 | ||
851f8a69 VY |
1154 | context_init(&newcontext); |
1155 | ||
0804d113 | 1156 | read_lock(&policy_rwlock); |
1da177e4 LT |
1157 | |
1158 | scontext = sidtab_search(&sidtab, ssid); | |
1159 | if (!scontext) { | |
744ba35e EP |
1160 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1161 | __func__, ssid); | |
1da177e4 LT |
1162 | rc = -EINVAL; |
1163 | goto out_unlock; | |
1164 | } | |
1165 | tcontext = sidtab_search(&sidtab, tsid); | |
1166 | if (!tcontext) { | |
744ba35e EP |
1167 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1168 | __func__, tsid); | |
1da177e4 LT |
1169 | rc = -EINVAL; |
1170 | goto out_unlock; | |
1171 | } | |
1172 | ||
1da177e4 LT |
1173 | /* Set the user identity. */ |
1174 | switch (specified) { | |
1175 | case AVTAB_TRANSITION: | |
1176 | case AVTAB_CHANGE: | |
1177 | /* Use the process user identity. */ | |
1178 | newcontext.user = scontext->user; | |
1179 | break; | |
1180 | case AVTAB_MEMBER: | |
1181 | /* Use the related object owner. */ | |
1182 | newcontext.user = tcontext->user; | |
1183 | break; | |
1184 | } | |
1185 | ||
1186 | /* Set the role and type to default values. */ | |
1187 | switch (tclass) { | |
1188 | case SECCLASS_PROCESS: | |
1189 | /* Use the current role and type of process. */ | |
1190 | newcontext.role = scontext->role; | |
1191 | newcontext.type = scontext->type; | |
1192 | break; | |
1193 | default: | |
1194 | /* Use the well-defined object role. */ | |
1195 | newcontext.role = OBJECT_R_VAL; | |
1196 | /* Use the type of the related object. */ | |
1197 | newcontext.type = tcontext->type; | |
1198 | } | |
1199 | ||
1200 | /* Look for a type transition/member/change rule. */ | |
1201 | avkey.source_type = scontext->type; | |
1202 | avkey.target_type = tcontext->type; | |
1203 | avkey.target_class = tclass; | |
782ebb99 SS |
1204 | avkey.specified = specified; |
1205 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
1206 | |
1207 | /* If no permanent rule, also check for enabled conditional rules */ | |
5d55a345 | 1208 | if (!avdatum) { |
782ebb99 | 1209 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
dbc74c65 | 1210 | for (; node; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 1211 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
1212 | avdatum = &node->datum; |
1213 | break; | |
1214 | } | |
1215 | } | |
1216 | } | |
1217 | ||
782ebb99 | 1218 | if (avdatum) { |
1da177e4 | 1219 | /* Use the type from the type transition/member/change rule. */ |
782ebb99 | 1220 | newcontext.type = avdatum->data; |
1da177e4 LT |
1221 | } |
1222 | ||
1223 | /* Check for class-specific changes. */ | |
1224 | switch (tclass) { | |
1225 | case SECCLASS_PROCESS: | |
1226 | if (specified & AVTAB_TRANSITION) { | |
1227 | /* Look for a role transition rule. */ | |
1228 | for (roletr = policydb.role_tr; roletr; | |
1229 | roletr = roletr->next) { | |
1230 | if (roletr->role == scontext->role && | |
1231 | roletr->type == tcontext->type) { | |
1232 | /* Use the role transition rule. */ | |
1233 | newcontext.role = roletr->new_role; | |
1234 | break; | |
1235 | } | |
1236 | } | |
1237 | } | |
1238 | break; | |
1239 | default: | |
1240 | break; | |
1241 | } | |
1242 | ||
1243 | /* Set the MLS attributes. | |
1244 | This is done last because it may allocate memory. */ | |
1245 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext); | |
1246 | if (rc) | |
1247 | goto out_unlock; | |
1248 | ||
1249 | /* Check the validity of the context. */ | |
1250 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
1251 | rc = compute_sid_handle_invalid_context(scontext, | |
1252 | tcontext, | |
1253 | tclass, | |
1254 | &newcontext); | |
1255 | if (rc) | |
1256 | goto out_unlock; | |
1257 | } | |
1258 | /* Obtain the sid for the context. */ | |
1259 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
1260 | out_unlock: | |
0804d113 | 1261 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1262 | context_destroy(&newcontext); |
1263 | out: | |
1264 | return rc; | |
1265 | } | |
1266 | ||
1267 | /** | |
1268 | * security_transition_sid - Compute the SID for a new subject/object. | |
1269 | * @ssid: source security identifier | |
1270 | * @tsid: target security identifier | |
1271 | * @tclass: target security class | |
1272 | * @out_sid: security identifier for new subject/object | |
1273 | * | |
1274 | * Compute a SID to use for labeling a new subject or object in the | |
1275 | * class @tclass based on a SID pair (@ssid, @tsid). | |
1276 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1277 | * if insufficient memory is available, or %0 if the new SID was | |
1278 | * computed successfully. | |
1279 | */ | |
1280 | int security_transition_sid(u32 ssid, | |
1281 | u32 tsid, | |
1282 | u16 tclass, | |
1283 | u32 *out_sid) | |
1284 | { | |
1285 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid); | |
1286 | } | |
1287 | ||
1288 | /** | |
1289 | * security_member_sid - Compute the SID for member selection. | |
1290 | * @ssid: source security identifier | |
1291 | * @tsid: target security identifier | |
1292 | * @tclass: target security class | |
1293 | * @out_sid: security identifier for selected member | |
1294 | * | |
1295 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1296 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1297 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1298 | * if insufficient memory is available, or %0 if the SID was | |
1299 | * computed successfully. | |
1300 | */ | |
1301 | int security_member_sid(u32 ssid, | |
1302 | u32 tsid, | |
1303 | u16 tclass, | |
1304 | u32 *out_sid) | |
1305 | { | |
1306 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid); | |
1307 | } | |
1308 | ||
1309 | /** | |
1310 | * security_change_sid - Compute the SID for object relabeling. | |
1311 | * @ssid: source security identifier | |
1312 | * @tsid: target security identifier | |
1313 | * @tclass: target security class | |
1314 | * @out_sid: security identifier for selected member | |
1315 | * | |
1316 | * Compute a SID to use for relabeling an object of class @tclass | |
1317 | * based on a SID pair (@ssid, @tsid). | |
1318 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1319 | * if insufficient memory is available, or %0 if the SID was | |
1320 | * computed successfully. | |
1321 | */ | |
1322 | int security_change_sid(u32 ssid, | |
1323 | u32 tsid, | |
1324 | u16 tclass, | |
1325 | u32 *out_sid) | |
1326 | { | |
1327 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid); | |
1328 | } | |
1329 | ||
b94c7e67 CS |
1330 | /* |
1331 | * Verify that each kernel class that is defined in the | |
1332 | * policy is correct | |
1333 | */ | |
1334 | static int validate_classes(struct policydb *p) | |
1335 | { | |
1336 | int i, j; | |
1337 | struct class_datum *cladatum; | |
1338 | struct perm_datum *perdatum; | |
1339 | u32 nprim, tmp, common_pts_len, perm_val, pol_val; | |
1340 | u16 class_val; | |
1341 | const struct selinux_class_perm *kdefs = &selinux_class_perm; | |
1342 | const char *def_class, *def_perm, *pol_class; | |
1343 | struct symtab *perms; | |
6cbe2706 | 1344 | bool print_unknown_handle = 0; |
b94c7e67 | 1345 | |
3f12070e EP |
1346 | if (p->allow_unknown) { |
1347 | u32 num_classes = kdefs->cts_len; | |
1348 | p->undefined_perms = kcalloc(num_classes, sizeof(u32), GFP_KERNEL); | |
1349 | if (!p->undefined_perms) | |
1350 | return -ENOMEM; | |
1351 | } | |
1352 | ||
b94c7e67 CS |
1353 | for (i = 1; i < kdefs->cts_len; i++) { |
1354 | def_class = kdefs->class_to_string[i]; | |
a764ae4b SS |
1355 | if (!def_class) |
1356 | continue; | |
b94c7e67 CS |
1357 | if (i > p->p_classes.nprim) { |
1358 | printk(KERN_INFO | |
454d972c | 1359 | "SELinux: class %s not defined in policy\n", |
b94c7e67 | 1360 | def_class); |
3f12070e EP |
1361 | if (p->reject_unknown) |
1362 | return -EINVAL; | |
1363 | if (p->allow_unknown) | |
1364 | p->undefined_perms[i-1] = ~0U; | |
6cbe2706 | 1365 | print_unknown_handle = 1; |
b94c7e67 CS |
1366 | continue; |
1367 | } | |
1368 | pol_class = p->p_class_val_to_name[i-1]; | |
1369 | if (strcmp(pol_class, def_class)) { | |
1370 | printk(KERN_ERR | |
454d972c | 1371 | "SELinux: class %d is incorrect, found %s but should be %s\n", |
b94c7e67 CS |
1372 | i, pol_class, def_class); |
1373 | return -EINVAL; | |
1374 | } | |
1375 | } | |
1376 | for (i = 0; i < kdefs->av_pts_len; i++) { | |
1377 | class_val = kdefs->av_perm_to_string[i].tclass; | |
1378 | perm_val = kdefs->av_perm_to_string[i].value; | |
1379 | def_perm = kdefs->av_perm_to_string[i].name; | |
1380 | if (class_val > p->p_classes.nprim) | |
1381 | continue; | |
1382 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1383 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1384 | BUG_ON(!cladatum); | |
1385 | perms = &cladatum->permissions; | |
1386 | nprim = 1 << (perms->nprim - 1); | |
1387 | if (perm_val > nprim) { | |
1388 | printk(KERN_INFO | |
454d972c | 1389 | "SELinux: permission %s in class %s not defined in policy\n", |
b94c7e67 | 1390 | def_perm, pol_class); |
3f12070e EP |
1391 | if (p->reject_unknown) |
1392 | return -EINVAL; | |
1393 | if (p->allow_unknown) | |
1394 | p->undefined_perms[class_val-1] |= perm_val; | |
6cbe2706 | 1395 | print_unknown_handle = 1; |
b94c7e67 CS |
1396 | continue; |
1397 | } | |
1398 | perdatum = hashtab_search(perms->table, def_perm); | |
1399 | if (perdatum == NULL) { | |
1400 | printk(KERN_ERR | |
454d972c | 1401 | "SELinux: permission %s in class %s not found in policy, bad policy\n", |
b94c7e67 CS |
1402 | def_perm, pol_class); |
1403 | return -EINVAL; | |
1404 | } | |
1405 | pol_val = 1 << (perdatum->value - 1); | |
1406 | if (pol_val != perm_val) { | |
1407 | printk(KERN_ERR | |
454d972c | 1408 | "SELinux: permission %s in class %s has incorrect value\n", |
b94c7e67 CS |
1409 | def_perm, pol_class); |
1410 | return -EINVAL; | |
1411 | } | |
1412 | } | |
1413 | for (i = 0; i < kdefs->av_inherit_len; i++) { | |
1414 | class_val = kdefs->av_inherit[i].tclass; | |
1415 | if (class_val > p->p_classes.nprim) | |
1416 | continue; | |
1417 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1418 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1419 | BUG_ON(!cladatum); | |
1420 | if (!cladatum->comdatum) { | |
1421 | printk(KERN_ERR | |
454d972c | 1422 | "SELinux: class %s should have an inherits clause but does not\n", |
b94c7e67 CS |
1423 | pol_class); |
1424 | return -EINVAL; | |
1425 | } | |
1426 | tmp = kdefs->av_inherit[i].common_base; | |
1427 | common_pts_len = 0; | |
1428 | while (!(tmp & 0x01)) { | |
1429 | common_pts_len++; | |
1430 | tmp >>= 1; | |
1431 | } | |
1432 | perms = &cladatum->comdatum->permissions; | |
1433 | for (j = 0; j < common_pts_len; j++) { | |
1434 | def_perm = kdefs->av_inherit[i].common_pts[j]; | |
1435 | if (j >= perms->nprim) { | |
1436 | printk(KERN_INFO | |
454d972c | 1437 | "SELinux: permission %s in class %s not defined in policy\n", |
b94c7e67 | 1438 | def_perm, pol_class); |
3f12070e EP |
1439 | if (p->reject_unknown) |
1440 | return -EINVAL; | |
1441 | if (p->allow_unknown) | |
1442 | p->undefined_perms[class_val-1] |= (1 << j); | |
6cbe2706 | 1443 | print_unknown_handle = 1; |
b94c7e67 CS |
1444 | continue; |
1445 | } | |
1446 | perdatum = hashtab_search(perms->table, def_perm); | |
1447 | if (perdatum == NULL) { | |
1448 | printk(KERN_ERR | |
454d972c | 1449 | "SELinux: permission %s in class %s not found in policy, bad policy\n", |
b94c7e67 CS |
1450 | def_perm, pol_class); |
1451 | return -EINVAL; | |
1452 | } | |
1453 | if (perdatum->value != j + 1) { | |
1454 | printk(KERN_ERR | |
454d972c | 1455 | "SELinux: permission %s in class %s has incorrect value\n", |
b94c7e67 CS |
1456 | def_perm, pol_class); |
1457 | return -EINVAL; | |
1458 | } | |
1459 | } | |
1460 | } | |
6cbe2706 EP |
1461 | if (print_unknown_handle) |
1462 | printk(KERN_INFO "SELinux: the above unknown classes and permissions will be %s\n", | |
1463 | (security_get_allow_unknown() ? "allowed" : "denied")); | |
b94c7e67 CS |
1464 | return 0; |
1465 | } | |
1466 | ||
1da177e4 LT |
1467 | /* Clone the SID into the new SID table. */ |
1468 | static int clone_sid(u32 sid, | |
1469 | struct context *context, | |
1470 | void *arg) | |
1471 | { | |
1472 | struct sidtab *s = arg; | |
1473 | ||
1474 | return sidtab_insert(s, sid, context); | |
1475 | } | |
1476 | ||
1477 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1478 | { | |
1479 | int rc = 0; | |
1480 | ||
1481 | if (selinux_enforcing) { | |
1482 | rc = -EINVAL; | |
1483 | } else { | |
1484 | char *s; | |
1485 | u32 len; | |
1486 | ||
12b29f34 SS |
1487 | if (!context_struct_to_string(context, &s, &len)) { |
1488 | printk(KERN_WARNING | |
1489 | "SELinux: Context %s would be invalid if enforcing\n", | |
1490 | s); | |
1491 | kfree(s); | |
1492 | } | |
1da177e4 LT |
1493 | } |
1494 | return rc; | |
1495 | } | |
1496 | ||
1497 | struct convert_context_args { | |
1498 | struct policydb *oldp; | |
1499 | struct policydb *newp; | |
1500 | }; | |
1501 | ||
1502 | /* | |
1503 | * Convert the values in the security context | |
1504 | * structure `c' from the values specified | |
1505 | * in the policy `p->oldp' to the values specified | |
1506 | * in the policy `p->newp'. Verify that the | |
1507 | * context is valid under the new policy. | |
1508 | */ | |
1509 | static int convert_context(u32 key, | |
1510 | struct context *c, | |
1511 | void *p) | |
1512 | { | |
1513 | struct convert_context_args *args; | |
1514 | struct context oldc; | |
1515 | struct role_datum *role; | |
1516 | struct type_datum *typdatum; | |
1517 | struct user_datum *usrdatum; | |
1518 | char *s; | |
1519 | u32 len; | |
1520 | int rc; | |
1521 | ||
1522 | args = p; | |
1523 | ||
12b29f34 SS |
1524 | if (c->str) { |
1525 | struct context ctx; | |
9a59daa0 SS |
1526 | s = kstrdup(c->str, GFP_KERNEL); |
1527 | if (!s) { | |
1528 | rc = -ENOMEM; | |
1529 | goto out; | |
1530 | } | |
1531 | rc = string_to_context_struct(args->newp, NULL, s, | |
1532 | c->len, &ctx, SECSID_NULL); | |
1533 | kfree(s); | |
12b29f34 SS |
1534 | if (!rc) { |
1535 | printk(KERN_INFO | |
1536 | "SELinux: Context %s became valid (mapped).\n", | |
1537 | c->str); | |
1538 | /* Replace string with mapped representation. */ | |
1539 | kfree(c->str); | |
1540 | memcpy(c, &ctx, sizeof(*c)); | |
1541 | goto out; | |
1542 | } else if (rc == -EINVAL) { | |
1543 | /* Retain string representation for later mapping. */ | |
1544 | rc = 0; | |
1545 | goto out; | |
1546 | } else { | |
1547 | /* Other error condition, e.g. ENOMEM. */ | |
1548 | printk(KERN_ERR | |
1549 | "SELinux: Unable to map context %s, rc = %d.\n", | |
1550 | c->str, -rc); | |
1551 | goto out; | |
1552 | } | |
1553 | } | |
1554 | ||
1da177e4 LT |
1555 | rc = context_cpy(&oldc, c); |
1556 | if (rc) | |
1557 | goto out; | |
1558 | ||
1559 | rc = -EINVAL; | |
1560 | ||
1561 | /* Convert the user. */ | |
1562 | usrdatum = hashtab_search(args->newp->p_users.table, | |
5d55a345 EP |
1563 | args->oldp->p_user_val_to_name[c->user - 1]); |
1564 | if (!usrdatum) | |
1da177e4 | 1565 | goto bad; |
1da177e4 LT |
1566 | c->user = usrdatum->value; |
1567 | ||
1568 | /* Convert the role. */ | |
1569 | role = hashtab_search(args->newp->p_roles.table, | |
5d55a345 EP |
1570 | args->oldp->p_role_val_to_name[c->role - 1]); |
1571 | if (!role) | |
1da177e4 | 1572 | goto bad; |
1da177e4 LT |
1573 | c->role = role->value; |
1574 | ||
1575 | /* Convert the type. */ | |
1576 | typdatum = hashtab_search(args->newp->p_types.table, | |
5d55a345 EP |
1577 | args->oldp->p_type_val_to_name[c->type - 1]); |
1578 | if (!typdatum) | |
1da177e4 | 1579 | goto bad; |
1da177e4 LT |
1580 | c->type = typdatum->value; |
1581 | ||
1582 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1583 | if (rc) | |
1584 | goto bad; | |
1585 | ||
1586 | /* Check the validity of the new context. */ | |
1587 | if (!policydb_context_isvalid(args->newp, c)) { | |
1588 | rc = convert_context_handle_invalid_context(&oldc); | |
1589 | if (rc) | |
1590 | goto bad; | |
1591 | } | |
1592 | ||
1593 | context_destroy(&oldc); | |
12b29f34 | 1594 | rc = 0; |
1da177e4 LT |
1595 | out: |
1596 | return rc; | |
1597 | bad: | |
12b29f34 SS |
1598 | /* Map old representation to string and save it. */ |
1599 | if (context_struct_to_string(&oldc, &s, &len)) | |
1600 | return -ENOMEM; | |
1da177e4 | 1601 | context_destroy(&oldc); |
12b29f34 SS |
1602 | context_destroy(c); |
1603 | c->str = s; | |
1604 | c->len = len; | |
1605 | printk(KERN_INFO | |
1606 | "SELinux: Context %s became invalid (unmapped).\n", | |
1607 | c->str); | |
1608 | rc = 0; | |
1da177e4 LT |
1609 | goto out; |
1610 | } | |
1611 | ||
3bb56b25 PM |
1612 | static void security_load_policycaps(void) |
1613 | { | |
1614 | selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps, | |
1615 | POLICYDB_CAPABILITY_NETPEER); | |
b0c636b9 EP |
1616 | selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps, |
1617 | POLICYDB_CAPABILITY_OPENPERM); | |
3bb56b25 PM |
1618 | } |
1619 | ||
1da177e4 | 1620 | extern void selinux_complete_init(void); |
e900a7d9 | 1621 | static int security_preserve_bools(struct policydb *p); |
1da177e4 LT |
1622 | |
1623 | /** | |
1624 | * security_load_policy - Load a security policy configuration. | |
1625 | * @data: binary policy data | |
1626 | * @len: length of data in bytes | |
1627 | * | |
1628 | * Load a new set of security policy configuration data, | |
1629 | * validate it and convert the SID table as necessary. | |
1630 | * This function will flush the access vector cache after | |
1631 | * loading the new policy. | |
1632 | */ | |
1633 | int security_load_policy(void *data, size_t len) | |
1634 | { | |
1635 | struct policydb oldpolicydb, newpolicydb; | |
1636 | struct sidtab oldsidtab, newsidtab; | |
1637 | struct convert_context_args args; | |
1638 | u32 seqno; | |
1639 | int rc = 0; | |
1640 | struct policy_file file = { data, len }, *fp = &file; | |
1641 | ||
1da177e4 LT |
1642 | if (!ss_initialized) { |
1643 | avtab_cache_init(); | |
1644 | if (policydb_read(&policydb, fp)) { | |
1da177e4 LT |
1645 | avtab_cache_destroy(); |
1646 | return -EINVAL; | |
1647 | } | |
1648 | if (policydb_load_isids(&policydb, &sidtab)) { | |
1da177e4 LT |
1649 | policydb_destroy(&policydb); |
1650 | avtab_cache_destroy(); | |
1651 | return -EINVAL; | |
1652 | } | |
b94c7e67 CS |
1653 | /* Verify that the kernel defined classes are correct. */ |
1654 | if (validate_classes(&policydb)) { | |
1655 | printk(KERN_ERR | |
454d972c | 1656 | "SELinux: the definition of a class is incorrect\n"); |
b94c7e67 CS |
1657 | sidtab_destroy(&sidtab); |
1658 | policydb_destroy(&policydb); | |
1659 | avtab_cache_destroy(); | |
1660 | return -EINVAL; | |
1661 | } | |
3bb56b25 | 1662 | security_load_policycaps(); |
1da177e4 LT |
1663 | policydb_loaded_version = policydb.policyvers; |
1664 | ss_initialized = 1; | |
4c443d1b | 1665 | seqno = ++latest_granting; |
1da177e4 | 1666 | selinux_complete_init(); |
4c443d1b SS |
1667 | avc_ss_reset(seqno); |
1668 | selnl_notify_policyload(seqno); | |
7420ed23 | 1669 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1670 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1671 | return 0; |
1672 | } | |
1673 | ||
1674 | #if 0 | |
1675 | sidtab_hash_eval(&sidtab, "sids"); | |
1676 | #endif | |
1677 | ||
89abd0ac | 1678 | if (policydb_read(&newpolicydb, fp)) |
1da177e4 | 1679 | return -EINVAL; |
1da177e4 | 1680 | |
12b29f34 | 1681 | if (sidtab_init(&newsidtab)) { |
12b29f34 SS |
1682 | policydb_destroy(&newpolicydb); |
1683 | return -ENOMEM; | |
1684 | } | |
1da177e4 | 1685 | |
b94c7e67 CS |
1686 | /* Verify that the kernel defined classes are correct. */ |
1687 | if (validate_classes(&newpolicydb)) { | |
1688 | printk(KERN_ERR | |
454d972c | 1689 | "SELinux: the definition of a class is incorrect\n"); |
b94c7e67 CS |
1690 | rc = -EINVAL; |
1691 | goto err; | |
1692 | } | |
1693 | ||
e900a7d9 SS |
1694 | rc = security_preserve_bools(&newpolicydb); |
1695 | if (rc) { | |
454d972c | 1696 | printk(KERN_ERR "SELinux: unable to preserve booleans\n"); |
e900a7d9 SS |
1697 | goto err; |
1698 | } | |
1699 | ||
1da177e4 LT |
1700 | /* Clone the SID table. */ |
1701 | sidtab_shutdown(&sidtab); | |
1702 | if (sidtab_map(&sidtab, clone_sid, &newsidtab)) { | |
1703 | rc = -ENOMEM; | |
1704 | goto err; | |
1705 | } | |
1706 | ||
12b29f34 SS |
1707 | /* |
1708 | * Convert the internal representations of contexts | |
1709 | * in the new SID table. | |
1710 | */ | |
1da177e4 LT |
1711 | args.oldp = &policydb; |
1712 | args.newp = &newpolicydb; | |
12b29f34 SS |
1713 | rc = sidtab_map(&newsidtab, convert_context, &args); |
1714 | if (rc) | |
1715 | goto err; | |
1da177e4 LT |
1716 | |
1717 | /* Save the old policydb and SID table to free later. */ | |
1718 | memcpy(&oldpolicydb, &policydb, sizeof policydb); | |
1719 | sidtab_set(&oldsidtab, &sidtab); | |
1720 | ||
1721 | /* Install the new policydb and SID table. */ | |
0804d113 | 1722 | write_lock_irq(&policy_rwlock); |
1da177e4 LT |
1723 | memcpy(&policydb, &newpolicydb, sizeof policydb); |
1724 | sidtab_set(&sidtab, &newsidtab); | |
3bb56b25 | 1725 | security_load_policycaps(); |
1da177e4 LT |
1726 | seqno = ++latest_granting; |
1727 | policydb_loaded_version = policydb.policyvers; | |
0804d113 | 1728 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
1729 | |
1730 | /* Free the old policydb and SID table. */ | |
1731 | policydb_destroy(&oldpolicydb); | |
1732 | sidtab_destroy(&oldsidtab); | |
1733 | ||
1734 | avc_ss_reset(seqno); | |
1735 | selnl_notify_policyload(seqno); | |
7420ed23 | 1736 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1737 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1738 | |
1739 | return 0; | |
1740 | ||
1741 | err: | |
1da177e4 LT |
1742 | sidtab_destroy(&newsidtab); |
1743 | policydb_destroy(&newpolicydb); | |
1744 | return rc; | |
1745 | ||
1746 | } | |
1747 | ||
1748 | /** | |
1749 | * security_port_sid - Obtain the SID for a port. | |
1da177e4 LT |
1750 | * @protocol: protocol number |
1751 | * @port: port number | |
1752 | * @out_sid: security identifier | |
1753 | */ | |
3e112172 | 1754 | int security_port_sid(u8 protocol, u16 port, u32 *out_sid) |
1da177e4 LT |
1755 | { |
1756 | struct ocontext *c; | |
1757 | int rc = 0; | |
1758 | ||
0804d113 | 1759 | read_lock(&policy_rwlock); |
1da177e4 LT |
1760 | |
1761 | c = policydb.ocontexts[OCON_PORT]; | |
1762 | while (c) { | |
1763 | if (c->u.port.protocol == protocol && | |
1764 | c->u.port.low_port <= port && | |
1765 | c->u.port.high_port >= port) | |
1766 | break; | |
1767 | c = c->next; | |
1768 | } | |
1769 | ||
1770 | if (c) { | |
1771 | if (!c->sid[0]) { | |
1772 | rc = sidtab_context_to_sid(&sidtab, | |
1773 | &c->context[0], | |
1774 | &c->sid[0]); | |
1775 | if (rc) | |
1776 | goto out; | |
1777 | } | |
1778 | *out_sid = c->sid[0]; | |
1779 | } else { | |
1780 | *out_sid = SECINITSID_PORT; | |
1781 | } | |
1782 | ||
1783 | out: | |
0804d113 | 1784 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1785 | return rc; |
1786 | } | |
1787 | ||
1788 | /** | |
1789 | * security_netif_sid - Obtain the SID for a network interface. | |
1790 | * @name: interface name | |
1791 | * @if_sid: interface SID | |
1da177e4 | 1792 | */ |
e8bfdb9d | 1793 | int security_netif_sid(char *name, u32 *if_sid) |
1da177e4 LT |
1794 | { |
1795 | int rc = 0; | |
1796 | struct ocontext *c; | |
1797 | ||
0804d113 | 1798 | read_lock(&policy_rwlock); |
1da177e4 LT |
1799 | |
1800 | c = policydb.ocontexts[OCON_NETIF]; | |
1801 | while (c) { | |
1802 | if (strcmp(name, c->u.name) == 0) | |
1803 | break; | |
1804 | c = c->next; | |
1805 | } | |
1806 | ||
1807 | if (c) { | |
1808 | if (!c->sid[0] || !c->sid[1]) { | |
1809 | rc = sidtab_context_to_sid(&sidtab, | |
1810 | &c->context[0], | |
1811 | &c->sid[0]); | |
1812 | if (rc) | |
1813 | goto out; | |
1814 | rc = sidtab_context_to_sid(&sidtab, | |
1815 | &c->context[1], | |
1816 | &c->sid[1]); | |
1817 | if (rc) | |
1818 | goto out; | |
1819 | } | |
1820 | *if_sid = c->sid[0]; | |
e8bfdb9d | 1821 | } else |
1da177e4 | 1822 | *if_sid = SECINITSID_NETIF; |
1da177e4 LT |
1823 | |
1824 | out: | |
0804d113 | 1825 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1826 | return rc; |
1827 | } | |
1828 | ||
1829 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
1830 | { | |
1831 | int i, fail = 0; | |
1832 | ||
5d55a345 EP |
1833 | for (i = 0; i < 4; i++) |
1834 | if (addr[i] != (input[i] & mask[i])) { | |
1da177e4 LT |
1835 | fail = 1; |
1836 | break; | |
1837 | } | |
1838 | ||
1839 | return !fail; | |
1840 | } | |
1841 | ||
1842 | /** | |
1843 | * security_node_sid - Obtain the SID for a node (host). | |
1844 | * @domain: communication domain aka address family | |
1845 | * @addrp: address | |
1846 | * @addrlen: address length in bytes | |
1847 | * @out_sid: security identifier | |
1848 | */ | |
1849 | int security_node_sid(u16 domain, | |
1850 | void *addrp, | |
1851 | u32 addrlen, | |
1852 | u32 *out_sid) | |
1853 | { | |
1854 | int rc = 0; | |
1855 | struct ocontext *c; | |
1856 | ||
0804d113 | 1857 | read_lock(&policy_rwlock); |
1da177e4 LT |
1858 | |
1859 | switch (domain) { | |
1860 | case AF_INET: { | |
1861 | u32 addr; | |
1862 | ||
1863 | if (addrlen != sizeof(u32)) { | |
1864 | rc = -EINVAL; | |
1865 | goto out; | |
1866 | } | |
1867 | ||
1868 | addr = *((u32 *)addrp); | |
1869 | ||
1870 | c = policydb.ocontexts[OCON_NODE]; | |
1871 | while (c) { | |
1872 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
1873 | break; | |
1874 | c = c->next; | |
1875 | } | |
1876 | break; | |
1877 | } | |
1878 | ||
1879 | case AF_INET6: | |
1880 | if (addrlen != sizeof(u64) * 2) { | |
1881 | rc = -EINVAL; | |
1882 | goto out; | |
1883 | } | |
1884 | c = policydb.ocontexts[OCON_NODE6]; | |
1885 | while (c) { | |
1886 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
1887 | c->u.node6.mask)) | |
1888 | break; | |
1889 | c = c->next; | |
1890 | } | |
1891 | break; | |
1892 | ||
1893 | default: | |
1894 | *out_sid = SECINITSID_NODE; | |
1895 | goto out; | |
1896 | } | |
1897 | ||
1898 | if (c) { | |
1899 | if (!c->sid[0]) { | |
1900 | rc = sidtab_context_to_sid(&sidtab, | |
1901 | &c->context[0], | |
1902 | &c->sid[0]); | |
1903 | if (rc) | |
1904 | goto out; | |
1905 | } | |
1906 | *out_sid = c->sid[0]; | |
1907 | } else { | |
1908 | *out_sid = SECINITSID_NODE; | |
1909 | } | |
1910 | ||
1911 | out: | |
0804d113 | 1912 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1913 | return rc; |
1914 | } | |
1915 | ||
1916 | #define SIDS_NEL 25 | |
1917 | ||
1918 | /** | |
1919 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
1920 | * @fromsid: starting SID | |
1921 | * @username: username | |
1922 | * @sids: array of reachable SIDs for user | |
1923 | * @nel: number of elements in @sids | |
1924 | * | |
1925 | * Generate the set of SIDs for legal security contexts | |
1926 | * for a given user that can be reached by @fromsid. | |
1927 | * Set *@sids to point to a dynamically allocated | |
1928 | * array containing the set of SIDs. Set *@nel to the | |
1929 | * number of elements in the array. | |
1930 | */ | |
1931 | ||
1932 | int security_get_user_sids(u32 fromsid, | |
5d55a345 | 1933 | char *username, |
1da177e4 LT |
1934 | u32 **sids, |
1935 | u32 *nel) | |
1936 | { | |
1937 | struct context *fromcon, usercon; | |
2c3c05db | 1938 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
1939 | u32 mynel = 0, maxnel = SIDS_NEL; |
1940 | struct user_datum *user; | |
1941 | struct role_datum *role; | |
782ebb99 | 1942 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
1943 | int rc = 0, i, j; |
1944 | ||
2c3c05db SS |
1945 | *sids = NULL; |
1946 | *nel = 0; | |
1947 | ||
1948 | if (!ss_initialized) | |
1da177e4 | 1949 | goto out; |
1da177e4 | 1950 | |
0804d113 | 1951 | read_lock(&policy_rwlock); |
1da177e4 | 1952 | |
12b29f34 SS |
1953 | context_init(&usercon); |
1954 | ||
1da177e4 LT |
1955 | fromcon = sidtab_search(&sidtab, fromsid); |
1956 | if (!fromcon) { | |
1957 | rc = -EINVAL; | |
1958 | goto out_unlock; | |
1959 | } | |
1960 | ||
1961 | user = hashtab_search(policydb.p_users.table, username); | |
1962 | if (!user) { | |
1963 | rc = -EINVAL; | |
1964 | goto out_unlock; | |
1965 | } | |
1966 | usercon.user = user->value; | |
1967 | ||
89d155ef | 1968 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
1da177e4 LT |
1969 | if (!mysids) { |
1970 | rc = -ENOMEM; | |
1971 | goto out_unlock; | |
1972 | } | |
1da177e4 | 1973 | |
9fe79ad1 | 1974 | ebitmap_for_each_positive_bit(&user->roles, rnode, i) { |
1da177e4 LT |
1975 | role = policydb.role_val_to_struct[i]; |
1976 | usercon.role = i+1; | |
9fe79ad1 | 1977 | ebitmap_for_each_positive_bit(&role->types, tnode, j) { |
1da177e4 LT |
1978 | usercon.type = j+1; |
1979 | ||
1980 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
1981 | continue; | |
1982 | ||
1da177e4 | 1983 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
2c3c05db | 1984 | if (rc) |
1da177e4 | 1985 | goto out_unlock; |
1da177e4 LT |
1986 | if (mynel < maxnel) { |
1987 | mysids[mynel++] = sid; | |
1988 | } else { | |
1989 | maxnel += SIDS_NEL; | |
89d155ef | 1990 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
1da177e4 LT |
1991 | if (!mysids2) { |
1992 | rc = -ENOMEM; | |
1da177e4 LT |
1993 | goto out_unlock; |
1994 | } | |
1da177e4 LT |
1995 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
1996 | kfree(mysids); | |
1997 | mysids = mysids2; | |
1998 | mysids[mynel++] = sid; | |
1999 | } | |
2000 | } | |
2001 | } | |
2002 | ||
1da177e4 | 2003 | out_unlock: |
0804d113 | 2004 | read_unlock(&policy_rwlock); |
2c3c05db SS |
2005 | if (rc || !mynel) { |
2006 | kfree(mysids); | |
2007 | goto out; | |
2008 | } | |
2009 | ||
2010 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); | |
2011 | if (!mysids2) { | |
2012 | rc = -ENOMEM; | |
2013 | kfree(mysids); | |
2014 | goto out; | |
2015 | } | |
2016 | for (i = 0, j = 0; i < mynel; i++) { | |
2017 | rc = avc_has_perm_noaudit(fromsid, mysids[i], | |
2018 | SECCLASS_PROCESS, | |
2019 | PROCESS__TRANSITION, AVC_STRICT, | |
2020 | NULL); | |
2021 | if (!rc) | |
2022 | mysids2[j++] = mysids[i]; | |
2023 | cond_resched(); | |
2024 | } | |
2025 | rc = 0; | |
2026 | kfree(mysids); | |
2027 | *sids = mysids2; | |
2028 | *nel = j; | |
1da177e4 LT |
2029 | out: |
2030 | return rc; | |
2031 | } | |
2032 | ||
2033 | /** | |
2034 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
2035 | * @fstype: filesystem type | |
2036 | * @path: path from root of mount | |
2037 | * @sclass: file security class | |
2038 | * @sid: SID for path | |
2039 | * | |
2040 | * Obtain a SID to use for a file in a filesystem that | |
2041 | * cannot support xattr or use a fixed labeling behavior like | |
2042 | * transition SIDs or task SIDs. | |
2043 | */ | |
2044 | int security_genfs_sid(const char *fstype, | |
5d55a345 | 2045 | char *path, |
1da177e4 LT |
2046 | u16 sclass, |
2047 | u32 *sid) | |
2048 | { | |
2049 | int len; | |
2050 | struct genfs *genfs; | |
2051 | struct ocontext *c; | |
2052 | int rc = 0, cmp = 0; | |
2053 | ||
b1aa5301 SS |
2054 | while (path[0] == '/' && path[1] == '/') |
2055 | path++; | |
2056 | ||
0804d113 | 2057 | read_lock(&policy_rwlock); |
1da177e4 LT |
2058 | |
2059 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { | |
2060 | cmp = strcmp(fstype, genfs->fstype); | |
2061 | if (cmp <= 0) | |
2062 | break; | |
2063 | } | |
2064 | ||
2065 | if (!genfs || cmp) { | |
2066 | *sid = SECINITSID_UNLABELED; | |
2067 | rc = -ENOENT; | |
2068 | goto out; | |
2069 | } | |
2070 | ||
2071 | for (c = genfs->head; c; c = c->next) { | |
2072 | len = strlen(c->u.name); | |
2073 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
2074 | (strncmp(c->u.name, path, len) == 0)) | |
2075 | break; | |
2076 | } | |
2077 | ||
2078 | if (!c) { | |
2079 | *sid = SECINITSID_UNLABELED; | |
2080 | rc = -ENOENT; | |
2081 | goto out; | |
2082 | } | |
2083 | ||
2084 | if (!c->sid[0]) { | |
2085 | rc = sidtab_context_to_sid(&sidtab, | |
2086 | &c->context[0], | |
2087 | &c->sid[0]); | |
2088 | if (rc) | |
2089 | goto out; | |
2090 | } | |
2091 | ||
2092 | *sid = c->sid[0]; | |
2093 | out: | |
0804d113 | 2094 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2095 | return rc; |
2096 | } | |
2097 | ||
2098 | /** | |
2099 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
2100 | * @fstype: filesystem type | |
2101 | * @behavior: labeling behavior | |
2102 | * @sid: SID for filesystem (superblock) | |
2103 | */ | |
2104 | int security_fs_use( | |
2105 | const char *fstype, | |
2106 | unsigned int *behavior, | |
089be43e | 2107 | u32 *sid) |
1da177e4 LT |
2108 | { |
2109 | int rc = 0; | |
2110 | struct ocontext *c; | |
2111 | ||
0804d113 | 2112 | read_lock(&policy_rwlock); |
1da177e4 LT |
2113 | |
2114 | c = policydb.ocontexts[OCON_FSUSE]; | |
2115 | while (c) { | |
2116 | if (strcmp(fstype, c->u.name) == 0) | |
2117 | break; | |
2118 | c = c->next; | |
2119 | } | |
2120 | ||
2121 | if (c) { | |
2122 | *behavior = c->v.behavior; | |
2123 | if (!c->sid[0]) { | |
2124 | rc = sidtab_context_to_sid(&sidtab, | |
2125 | &c->context[0], | |
2126 | &c->sid[0]); | |
2127 | if (rc) | |
2128 | goto out; | |
2129 | } | |
2130 | *sid = c->sid[0]; | |
2131 | } else { | |
089be43e JM |
2132 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); |
2133 | if (rc) { | |
2134 | *behavior = SECURITY_FS_USE_NONE; | |
2135 | rc = 0; | |
2136 | } else { | |
2137 | *behavior = SECURITY_FS_USE_GENFS; | |
2138 | } | |
1da177e4 LT |
2139 | } |
2140 | ||
2141 | out: | |
0804d113 | 2142 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2143 | return rc; |
2144 | } | |
2145 | ||
2146 | int security_get_bools(int *len, char ***names, int **values) | |
2147 | { | |
2148 | int i, rc = -ENOMEM; | |
2149 | ||
0804d113 | 2150 | read_lock(&policy_rwlock); |
1da177e4 LT |
2151 | *names = NULL; |
2152 | *values = NULL; | |
2153 | ||
2154 | *len = policydb.p_bools.nprim; | |
2155 | if (!*len) { | |
2156 | rc = 0; | |
2157 | goto out; | |
2158 | } | |
2159 | ||
5d55a345 | 2160 | *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); |
1da177e4 LT |
2161 | if (!*names) |
2162 | goto err; | |
1da177e4 | 2163 | |
e0795cf4 | 2164 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); |
1da177e4 LT |
2165 | if (!*values) |
2166 | goto err; | |
2167 | ||
2168 | for (i = 0; i < *len; i++) { | |
2169 | size_t name_len; | |
2170 | (*values)[i] = policydb.bool_val_to_struct[i]->state; | |
2171 | name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; | |
5d55a345 | 2172 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); |
1da177e4 LT |
2173 | if (!(*names)[i]) |
2174 | goto err; | |
2175 | strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); | |
2176 | (*names)[i][name_len - 1] = 0; | |
2177 | } | |
2178 | rc = 0; | |
2179 | out: | |
0804d113 | 2180 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2181 | return rc; |
2182 | err: | |
2183 | if (*names) { | |
2184 | for (i = 0; i < *len; i++) | |
9a5f04bf | 2185 | kfree((*names)[i]); |
1da177e4 | 2186 | } |
9a5f04bf | 2187 | kfree(*values); |
1da177e4 LT |
2188 | goto out; |
2189 | } | |
2190 | ||
2191 | ||
2192 | int security_set_bools(int len, int *values) | |
2193 | { | |
2194 | int i, rc = 0; | |
2195 | int lenp, seqno = 0; | |
2196 | struct cond_node *cur; | |
2197 | ||
0804d113 | 2198 | write_lock_irq(&policy_rwlock); |
1da177e4 LT |
2199 | |
2200 | lenp = policydb.p_bools.nprim; | |
2201 | if (len != lenp) { | |
2202 | rc = -EFAULT; | |
2203 | goto out; | |
2204 | } | |
2205 | ||
1da177e4 | 2206 | for (i = 0; i < len; i++) { |
af601e46 SG |
2207 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
2208 | audit_log(current->audit_context, GFP_ATOMIC, | |
2209 | AUDIT_MAC_CONFIG_CHANGE, | |
4746ec5b | 2210 | "bool=%s val=%d old_val=%d auid=%u ses=%u", |
af601e46 SG |
2211 | policydb.p_bool_val_to_name[i], |
2212 | !!values[i], | |
2213 | policydb.bool_val_to_struct[i]->state, | |
4746ec5b EP |
2214 | audit_get_loginuid(current), |
2215 | audit_get_sessionid(current)); | |
af601e46 | 2216 | } |
5d55a345 | 2217 | if (values[i]) |
1da177e4 | 2218 | policydb.bool_val_to_struct[i]->state = 1; |
5d55a345 | 2219 | else |
1da177e4 | 2220 | policydb.bool_val_to_struct[i]->state = 0; |
1da177e4 | 2221 | } |
1da177e4 | 2222 | |
dbc74c65 | 2223 | for (cur = policydb.cond_list; cur; cur = cur->next) { |
1da177e4 LT |
2224 | rc = evaluate_cond_node(&policydb, cur); |
2225 | if (rc) | |
2226 | goto out; | |
2227 | } | |
2228 | ||
2229 | seqno = ++latest_granting; | |
2230 | ||
2231 | out: | |
0804d113 | 2232 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
2233 | if (!rc) { |
2234 | avc_ss_reset(seqno); | |
2235 | selnl_notify_policyload(seqno); | |
342a0cff | 2236 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
2237 | } |
2238 | return rc; | |
2239 | } | |
2240 | ||
2241 | int security_get_bool_value(int bool) | |
2242 | { | |
2243 | int rc = 0; | |
2244 | int len; | |
2245 | ||
0804d113 | 2246 | read_lock(&policy_rwlock); |
1da177e4 LT |
2247 | |
2248 | len = policydb.p_bools.nprim; | |
2249 | if (bool >= len) { | |
2250 | rc = -EFAULT; | |
2251 | goto out; | |
2252 | } | |
2253 | ||
2254 | rc = policydb.bool_val_to_struct[bool]->state; | |
2255 | out: | |
0804d113 | 2256 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2257 | return rc; |
2258 | } | |
376bd9cb | 2259 | |
e900a7d9 SS |
2260 | static int security_preserve_bools(struct policydb *p) |
2261 | { | |
2262 | int rc, nbools = 0, *bvalues = NULL, i; | |
2263 | char **bnames = NULL; | |
2264 | struct cond_bool_datum *booldatum; | |
2265 | struct cond_node *cur; | |
2266 | ||
2267 | rc = security_get_bools(&nbools, &bnames, &bvalues); | |
2268 | if (rc) | |
2269 | goto out; | |
2270 | for (i = 0; i < nbools; i++) { | |
2271 | booldatum = hashtab_search(p->p_bools.table, bnames[i]); | |
2272 | if (booldatum) | |
2273 | booldatum->state = bvalues[i]; | |
2274 | } | |
dbc74c65 | 2275 | for (cur = p->cond_list; cur; cur = cur->next) { |
e900a7d9 SS |
2276 | rc = evaluate_cond_node(p, cur); |
2277 | if (rc) | |
2278 | goto out; | |
2279 | } | |
2280 | ||
2281 | out: | |
2282 | if (bnames) { | |
2283 | for (i = 0; i < nbools; i++) | |
2284 | kfree(bnames[i]); | |
2285 | } | |
2286 | kfree(bnames); | |
2287 | kfree(bvalues); | |
2288 | return rc; | |
2289 | } | |
2290 | ||
08554d6b VY |
2291 | /* |
2292 | * security_sid_mls_copy() - computes a new sid based on the given | |
2293 | * sid and the mls portion of mls_sid. | |
2294 | */ | |
2295 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
2296 | { | |
2297 | struct context *context1; | |
2298 | struct context *context2; | |
2299 | struct context newcon; | |
2300 | char *s; | |
2301 | u32 len; | |
2302 | int rc = 0; | |
2303 | ||
4eb327b5 | 2304 | if (!ss_initialized || !selinux_mls_enabled) { |
08554d6b VY |
2305 | *new_sid = sid; |
2306 | goto out; | |
2307 | } | |
2308 | ||
2309 | context_init(&newcon); | |
2310 | ||
0804d113 | 2311 | read_lock(&policy_rwlock); |
08554d6b VY |
2312 | context1 = sidtab_search(&sidtab, sid); |
2313 | if (!context1) { | |
744ba35e EP |
2314 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2315 | __func__, sid); | |
08554d6b VY |
2316 | rc = -EINVAL; |
2317 | goto out_unlock; | |
2318 | } | |
2319 | ||
2320 | context2 = sidtab_search(&sidtab, mls_sid); | |
2321 | if (!context2) { | |
744ba35e EP |
2322 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2323 | __func__, mls_sid); | |
08554d6b VY |
2324 | rc = -EINVAL; |
2325 | goto out_unlock; | |
2326 | } | |
2327 | ||
2328 | newcon.user = context1->user; | |
2329 | newcon.role = context1->role; | |
2330 | newcon.type = context1->type; | |
0efc61ea | 2331 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
2332 | if (rc) |
2333 | goto out_unlock; | |
2334 | ||
08554d6b VY |
2335 | /* Check the validity of the new context. */ |
2336 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
2337 | rc = convert_context_handle_invalid_context(&newcon); | |
2338 | if (rc) | |
2339 | goto bad; | |
2340 | } | |
2341 | ||
2342 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
2343 | goto out_unlock; | |
2344 | ||
2345 | bad: | |
2346 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
2347 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2348 | "security_sid_mls_copy: invalid context %s", s); | |
2349 | kfree(s); | |
2350 | } | |
2351 | ||
2352 | out_unlock: | |
0804d113 | 2353 | read_unlock(&policy_rwlock); |
08554d6b VY |
2354 | context_destroy(&newcon); |
2355 | out: | |
2356 | return rc; | |
2357 | } | |
2358 | ||
220deb96 PM |
2359 | /** |
2360 | * security_net_peersid_resolve - Compare and resolve two network peer SIDs | |
2361 | * @nlbl_sid: NetLabel SID | |
2362 | * @nlbl_type: NetLabel labeling protocol type | |
2363 | * @xfrm_sid: XFRM SID | |
2364 | * | |
2365 | * Description: | |
2366 | * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be | |
2367 | * resolved into a single SID it is returned via @peer_sid and the function | |
2368 | * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function | |
2369 | * returns a negative value. A table summarizing the behavior is below: | |
2370 | * | |
2371 | * | function return | @sid | |
2372 | * ------------------------------+-----------------+----------------- | |
2373 | * no peer labels | 0 | SECSID_NULL | |
2374 | * single peer label | 0 | <peer_label> | |
2375 | * multiple, consistent labels | 0 | <peer_label> | |
2376 | * multiple, inconsistent labels | -<errno> | SECSID_NULL | |
2377 | * | |
2378 | */ | |
2379 | int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, | |
2380 | u32 xfrm_sid, | |
2381 | u32 *peer_sid) | |
2382 | { | |
2383 | int rc; | |
2384 | struct context *nlbl_ctx; | |
2385 | struct context *xfrm_ctx; | |
2386 | ||
2387 | /* handle the common (which also happens to be the set of easy) cases | |
2388 | * right away, these two if statements catch everything involving a | |
2389 | * single or absent peer SID/label */ | |
2390 | if (xfrm_sid == SECSID_NULL) { | |
2391 | *peer_sid = nlbl_sid; | |
2392 | return 0; | |
2393 | } | |
2394 | /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label | |
2395 | * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label | |
2396 | * is present */ | |
2397 | if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { | |
2398 | *peer_sid = xfrm_sid; | |
2399 | return 0; | |
2400 | } | |
2401 | ||
2402 | /* we don't need to check ss_initialized here since the only way both | |
2403 | * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the | |
2404 | * security server was initialized and ss_initialized was true */ | |
2405 | if (!selinux_mls_enabled) { | |
2406 | *peer_sid = SECSID_NULL; | |
2407 | return 0; | |
2408 | } | |
2409 | ||
0804d113 | 2410 | read_lock(&policy_rwlock); |
220deb96 PM |
2411 | |
2412 | nlbl_ctx = sidtab_search(&sidtab, nlbl_sid); | |
2413 | if (!nlbl_ctx) { | |
744ba35e EP |
2414 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2415 | __func__, nlbl_sid); | |
220deb96 PM |
2416 | rc = -EINVAL; |
2417 | goto out_slowpath; | |
2418 | } | |
2419 | xfrm_ctx = sidtab_search(&sidtab, xfrm_sid); | |
2420 | if (!xfrm_ctx) { | |
744ba35e EP |
2421 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2422 | __func__, xfrm_sid); | |
220deb96 PM |
2423 | rc = -EINVAL; |
2424 | goto out_slowpath; | |
2425 | } | |
2426 | rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); | |
2427 | ||
2428 | out_slowpath: | |
0804d113 | 2429 | read_unlock(&policy_rwlock); |
220deb96 PM |
2430 | if (rc == 0) |
2431 | /* at present NetLabel SIDs/labels really only carry MLS | |
2432 | * information so if the MLS portion of the NetLabel SID | |
2433 | * matches the MLS portion of the labeled XFRM SID/label | |
2434 | * then pass along the XFRM SID as it is the most | |
2435 | * expressive */ | |
2436 | *peer_sid = xfrm_sid; | |
2437 | else | |
2438 | *peer_sid = SECSID_NULL; | |
2439 | return rc; | |
2440 | } | |
2441 | ||
55fcf09b CP |
2442 | static int get_classes_callback(void *k, void *d, void *args) |
2443 | { | |
2444 | struct class_datum *datum = d; | |
2445 | char *name = k, **classes = args; | |
2446 | int value = datum->value - 1; | |
2447 | ||
2448 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
2449 | if (!classes[value]) | |
2450 | return -ENOMEM; | |
2451 | ||
2452 | return 0; | |
2453 | } | |
2454 | ||
2455 | int security_get_classes(char ***classes, int *nclasses) | |
2456 | { | |
2457 | int rc = -ENOMEM; | |
2458 | ||
0804d113 | 2459 | read_lock(&policy_rwlock); |
55fcf09b CP |
2460 | |
2461 | *nclasses = policydb.p_classes.nprim; | |
2462 | *classes = kcalloc(*nclasses, sizeof(*classes), GFP_ATOMIC); | |
2463 | if (!*classes) | |
2464 | goto out; | |
2465 | ||
2466 | rc = hashtab_map(policydb.p_classes.table, get_classes_callback, | |
2467 | *classes); | |
2468 | if (rc < 0) { | |
2469 | int i; | |
2470 | for (i = 0; i < *nclasses; i++) | |
2471 | kfree((*classes)[i]); | |
2472 | kfree(*classes); | |
2473 | } | |
2474 | ||
2475 | out: | |
0804d113 | 2476 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2477 | return rc; |
2478 | } | |
2479 | ||
2480 | static int get_permissions_callback(void *k, void *d, void *args) | |
2481 | { | |
2482 | struct perm_datum *datum = d; | |
2483 | char *name = k, **perms = args; | |
2484 | int value = datum->value - 1; | |
2485 | ||
2486 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
2487 | if (!perms[value]) | |
2488 | return -ENOMEM; | |
2489 | ||
2490 | return 0; | |
2491 | } | |
2492 | ||
2493 | int security_get_permissions(char *class, char ***perms, int *nperms) | |
2494 | { | |
2495 | int rc = -ENOMEM, i; | |
2496 | struct class_datum *match; | |
2497 | ||
0804d113 | 2498 | read_lock(&policy_rwlock); |
55fcf09b CP |
2499 | |
2500 | match = hashtab_search(policydb.p_classes.table, class); | |
2501 | if (!match) { | |
744ba35e | 2502 | printk(KERN_ERR "SELinux: %s: unrecognized class %s\n", |
dd6f953a | 2503 | __func__, class); |
55fcf09b CP |
2504 | rc = -EINVAL; |
2505 | goto out; | |
2506 | } | |
2507 | ||
2508 | *nperms = match->permissions.nprim; | |
2509 | *perms = kcalloc(*nperms, sizeof(*perms), GFP_ATOMIC); | |
2510 | if (!*perms) | |
2511 | goto out; | |
2512 | ||
2513 | if (match->comdatum) { | |
2514 | rc = hashtab_map(match->comdatum->permissions.table, | |
2515 | get_permissions_callback, *perms); | |
2516 | if (rc < 0) | |
2517 | goto err; | |
2518 | } | |
2519 | ||
2520 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
2521 | *perms); | |
2522 | if (rc < 0) | |
2523 | goto err; | |
2524 | ||
2525 | out: | |
0804d113 | 2526 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2527 | return rc; |
2528 | ||
2529 | err: | |
0804d113 | 2530 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2531 | for (i = 0; i < *nperms; i++) |
2532 | kfree((*perms)[i]); | |
2533 | kfree(*perms); | |
2534 | return rc; | |
2535 | } | |
2536 | ||
3f12070e EP |
2537 | int security_get_reject_unknown(void) |
2538 | { | |
2539 | return policydb.reject_unknown; | |
2540 | } | |
2541 | ||
2542 | int security_get_allow_unknown(void) | |
2543 | { | |
2544 | return policydb.allow_unknown; | |
2545 | } | |
2546 | ||
3bb56b25 PM |
2547 | /** |
2548 | * security_policycap_supported - Check for a specific policy capability | |
2549 | * @req_cap: capability | |
2550 | * | |
2551 | * Description: | |
2552 | * This function queries the currently loaded policy to see if it supports the | |
2553 | * capability specified by @req_cap. Returns true (1) if the capability is | |
2554 | * supported, false (0) if it isn't supported. | |
2555 | * | |
2556 | */ | |
2557 | int security_policycap_supported(unsigned int req_cap) | |
2558 | { | |
2559 | int rc; | |
2560 | ||
0804d113 | 2561 | read_lock(&policy_rwlock); |
3bb56b25 | 2562 | rc = ebitmap_get_bit(&policydb.policycaps, req_cap); |
0804d113 | 2563 | read_unlock(&policy_rwlock); |
3bb56b25 PM |
2564 | |
2565 | return rc; | |
2566 | } | |
2567 | ||
376bd9cb DG |
2568 | struct selinux_audit_rule { |
2569 | u32 au_seqno; | |
2570 | struct context au_ctxt; | |
2571 | }; | |
2572 | ||
9d57a7f9 | 2573 | void selinux_audit_rule_free(void *vrule) |
376bd9cb | 2574 | { |
9d57a7f9 AD |
2575 | struct selinux_audit_rule *rule = vrule; |
2576 | ||
376bd9cb DG |
2577 | if (rule) { |
2578 | context_destroy(&rule->au_ctxt); | |
2579 | kfree(rule); | |
2580 | } | |
2581 | } | |
2582 | ||
9d57a7f9 | 2583 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) |
376bd9cb DG |
2584 | { |
2585 | struct selinux_audit_rule *tmprule; | |
2586 | struct role_datum *roledatum; | |
2587 | struct type_datum *typedatum; | |
2588 | struct user_datum *userdatum; | |
9d57a7f9 | 2589 | struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule; |
376bd9cb DG |
2590 | int rc = 0; |
2591 | ||
2592 | *rule = NULL; | |
2593 | ||
2594 | if (!ss_initialized) | |
3ad40d64 | 2595 | return -EOPNOTSUPP; |
376bd9cb DG |
2596 | |
2597 | switch (field) { | |
3a6b9f85 DG |
2598 | case AUDIT_SUBJ_USER: |
2599 | case AUDIT_SUBJ_ROLE: | |
2600 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
2601 | case AUDIT_OBJ_USER: |
2602 | case AUDIT_OBJ_ROLE: | |
2603 | case AUDIT_OBJ_TYPE: | |
376bd9cb | 2604 | /* only 'equals' and 'not equals' fit user, role, and type */ |
5af75d8d | 2605 | if (op != Audit_equal && op != Audit_not_equal) |
376bd9cb DG |
2606 | return -EINVAL; |
2607 | break; | |
3a6b9f85 DG |
2608 | case AUDIT_SUBJ_SEN: |
2609 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2610 | case AUDIT_OBJ_LEV_LOW: |
2611 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2612 | /* we do not allow a range, indicated by the presense of '-' */ |
2613 | if (strchr(rulestr, '-')) | |
2614 | return -EINVAL; | |
2615 | break; | |
2616 | default: | |
2617 | /* only the above fields are valid */ | |
2618 | return -EINVAL; | |
2619 | } | |
2620 | ||
2621 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
2622 | if (!tmprule) | |
2623 | return -ENOMEM; | |
2624 | ||
2625 | context_init(&tmprule->au_ctxt); | |
2626 | ||
0804d113 | 2627 | read_lock(&policy_rwlock); |
376bd9cb DG |
2628 | |
2629 | tmprule->au_seqno = latest_granting; | |
2630 | ||
2631 | switch (field) { | |
3a6b9f85 | 2632 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2633 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2634 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
2635 | if (!userdatum) | |
2636 | rc = -EINVAL; | |
2637 | else | |
2638 | tmprule->au_ctxt.user = userdatum->value; | |
2639 | break; | |
3a6b9f85 | 2640 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2641 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2642 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
2643 | if (!roledatum) | |
2644 | rc = -EINVAL; | |
2645 | else | |
2646 | tmprule->au_ctxt.role = roledatum->value; | |
2647 | break; | |
3a6b9f85 | 2648 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2649 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2650 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
2651 | if (!typedatum) | |
2652 | rc = -EINVAL; | |
2653 | else | |
2654 | tmprule->au_ctxt.type = typedatum->value; | |
2655 | break; | |
3a6b9f85 DG |
2656 | case AUDIT_SUBJ_SEN: |
2657 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2658 | case AUDIT_OBJ_LEV_LOW: |
2659 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2660 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
2661 | break; | |
2662 | } | |
2663 | ||
0804d113 | 2664 | read_unlock(&policy_rwlock); |
376bd9cb DG |
2665 | |
2666 | if (rc) { | |
2667 | selinux_audit_rule_free(tmprule); | |
2668 | tmprule = NULL; | |
2669 | } | |
2670 | ||
2671 | *rule = tmprule; | |
2672 | ||
2673 | return rc; | |
2674 | } | |
2675 | ||
9d57a7f9 AD |
2676 | /* Check to see if the rule contains any selinux fields */ |
2677 | int selinux_audit_rule_known(struct audit_krule *rule) | |
2678 | { | |
2679 | int i; | |
2680 | ||
2681 | for (i = 0; i < rule->field_count; i++) { | |
2682 | struct audit_field *f = &rule->fields[i]; | |
2683 | switch (f->type) { | |
2684 | case AUDIT_SUBJ_USER: | |
2685 | case AUDIT_SUBJ_ROLE: | |
2686 | case AUDIT_SUBJ_TYPE: | |
2687 | case AUDIT_SUBJ_SEN: | |
2688 | case AUDIT_SUBJ_CLR: | |
2689 | case AUDIT_OBJ_USER: | |
2690 | case AUDIT_OBJ_ROLE: | |
2691 | case AUDIT_OBJ_TYPE: | |
2692 | case AUDIT_OBJ_LEV_LOW: | |
2693 | case AUDIT_OBJ_LEV_HIGH: | |
2694 | return 1; | |
2695 | } | |
2696 | } | |
2697 | ||
2698 | return 0; | |
2699 | } | |
2700 | ||
2701 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, | |
f5269710 | 2702 | struct audit_context *actx) |
376bd9cb DG |
2703 | { |
2704 | struct context *ctxt; | |
2705 | struct mls_level *level; | |
9d57a7f9 | 2706 | struct selinux_audit_rule *rule = vrule; |
376bd9cb DG |
2707 | int match = 0; |
2708 | ||
2709 | if (!rule) { | |
2710 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2711 | "selinux_audit_rule_match: missing rule\n"); |
376bd9cb DG |
2712 | return -ENOENT; |
2713 | } | |
2714 | ||
0804d113 | 2715 | read_lock(&policy_rwlock); |
376bd9cb DG |
2716 | |
2717 | if (rule->au_seqno < latest_granting) { | |
2718 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2719 | "selinux_audit_rule_match: stale rule\n"); |
376bd9cb DG |
2720 | match = -ESTALE; |
2721 | goto out; | |
2722 | } | |
2723 | ||
9a2f44f0 | 2724 | ctxt = sidtab_search(&sidtab, sid); |
376bd9cb DG |
2725 | if (!ctxt) { |
2726 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 EP |
2727 | "selinux_audit_rule_match: unrecognized SID %d\n", |
2728 | sid); | |
376bd9cb DG |
2729 | match = -ENOENT; |
2730 | goto out; | |
2731 | } | |
2732 | ||
2733 | /* a field/op pair that is not caught here will simply fall through | |
2734 | without a match */ | |
2735 | switch (field) { | |
3a6b9f85 | 2736 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2737 | case AUDIT_OBJ_USER: |
376bd9cb | 2738 | switch (op) { |
5af75d8d | 2739 | case Audit_equal: |
376bd9cb DG |
2740 | match = (ctxt->user == rule->au_ctxt.user); |
2741 | break; | |
5af75d8d | 2742 | case Audit_not_equal: |
376bd9cb DG |
2743 | match = (ctxt->user != rule->au_ctxt.user); |
2744 | break; | |
2745 | } | |
2746 | break; | |
3a6b9f85 | 2747 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2748 | case AUDIT_OBJ_ROLE: |
376bd9cb | 2749 | switch (op) { |
5af75d8d | 2750 | case Audit_equal: |
376bd9cb DG |
2751 | match = (ctxt->role == rule->au_ctxt.role); |
2752 | break; | |
5af75d8d | 2753 | case Audit_not_equal: |
376bd9cb DG |
2754 | match = (ctxt->role != rule->au_ctxt.role); |
2755 | break; | |
2756 | } | |
2757 | break; | |
3a6b9f85 | 2758 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2759 | case AUDIT_OBJ_TYPE: |
376bd9cb | 2760 | switch (op) { |
5af75d8d | 2761 | case Audit_equal: |
376bd9cb DG |
2762 | match = (ctxt->type == rule->au_ctxt.type); |
2763 | break; | |
5af75d8d | 2764 | case Audit_not_equal: |
376bd9cb DG |
2765 | match = (ctxt->type != rule->au_ctxt.type); |
2766 | break; | |
2767 | } | |
2768 | break; | |
3a6b9f85 DG |
2769 | case AUDIT_SUBJ_SEN: |
2770 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2771 | case AUDIT_OBJ_LEV_LOW: |
2772 | case AUDIT_OBJ_LEV_HIGH: | |
2773 | level = ((field == AUDIT_SUBJ_SEN || | |
5d55a345 EP |
2774 | field == AUDIT_OBJ_LEV_LOW) ? |
2775 | &ctxt->range.level[0] : &ctxt->range.level[1]); | |
376bd9cb | 2776 | switch (op) { |
5af75d8d | 2777 | case Audit_equal: |
376bd9cb | 2778 | match = mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 2779 | level); |
376bd9cb | 2780 | break; |
5af75d8d | 2781 | case Audit_not_equal: |
376bd9cb | 2782 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 2783 | level); |
376bd9cb | 2784 | break; |
5af75d8d | 2785 | case Audit_lt: |
376bd9cb | 2786 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 EP |
2787 | level) && |
2788 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2789 | level)); | |
376bd9cb | 2790 | break; |
5af75d8d | 2791 | case Audit_le: |
376bd9cb | 2792 | match = mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 | 2793 | level); |
376bd9cb | 2794 | break; |
5af75d8d | 2795 | case Audit_gt: |
376bd9cb | 2796 | match = (mls_level_dom(level, |
5d55a345 EP |
2797 | &rule->au_ctxt.range.level[0]) && |
2798 | !mls_level_eq(level, | |
2799 | &rule->au_ctxt.range.level[0])); | |
376bd9cb | 2800 | break; |
5af75d8d | 2801 | case Audit_ge: |
376bd9cb | 2802 | match = mls_level_dom(level, |
5d55a345 | 2803 | &rule->au_ctxt.range.level[0]); |
376bd9cb DG |
2804 | break; |
2805 | } | |
2806 | } | |
2807 | ||
2808 | out: | |
0804d113 | 2809 | read_unlock(&policy_rwlock); |
376bd9cb DG |
2810 | return match; |
2811 | } | |
2812 | ||
9d57a7f9 | 2813 | static int (*aurule_callback)(void) = audit_update_lsm_rules; |
376bd9cb DG |
2814 | |
2815 | static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid, | |
f5269710 | 2816 | u16 class, u32 perms, u32 *retained) |
376bd9cb DG |
2817 | { |
2818 | int err = 0; | |
2819 | ||
2820 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
2821 | err = aurule_callback(); | |
2822 | return err; | |
2823 | } | |
2824 | ||
2825 | static int __init aurule_init(void) | |
2826 | { | |
2827 | int err; | |
2828 | ||
2829 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET, | |
5d55a345 | 2830 | SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0); |
376bd9cb DG |
2831 | if (err) |
2832 | panic("avc_add_callback() failed, error %d\n", err); | |
2833 | ||
2834 | return err; | |
2835 | } | |
2836 | __initcall(aurule_init); | |
2837 | ||
7420ed23 | 2838 | #ifdef CONFIG_NETLABEL |
7420ed23 | 2839 | /** |
5778eabd PM |
2840 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
2841 | * @secattr: the NetLabel packet security attributes | |
5dbe1eb0 | 2842 | * @sid: the SELinux SID |
7420ed23 VY |
2843 | * |
2844 | * Description: | |
2845 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
2846 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
2847 | * already been initialized. | |
7420ed23 VY |
2848 | * |
2849 | */ | |
5778eabd | 2850 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
5dbe1eb0 | 2851 | u32 sid) |
7420ed23 | 2852 | { |
5dbe1eb0 | 2853 | u32 *sid_cache; |
7420ed23 | 2854 | |
5dbe1eb0 PM |
2855 | sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC); |
2856 | if (sid_cache == NULL) | |
5778eabd | 2857 | return; |
5dbe1eb0 PM |
2858 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
2859 | if (secattr->cache == NULL) { | |
2860 | kfree(sid_cache); | |
5778eabd | 2861 | return; |
0ec8abd7 | 2862 | } |
7420ed23 | 2863 | |
5dbe1eb0 PM |
2864 | *sid_cache = sid; |
2865 | secattr->cache->free = kfree; | |
2866 | secattr->cache->data = sid_cache; | |
5778eabd | 2867 | secattr->flags |= NETLBL_SECATTR_CACHE; |
7420ed23 VY |
2868 | } |
2869 | ||
2870 | /** | |
5778eabd | 2871 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 | 2872 | * @secattr: the NetLabel packet security attributes |
7420ed23 VY |
2873 | * @sid: the SELinux SID |
2874 | * | |
2875 | * Description: | |
5778eabd | 2876 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 2877 | * SELinux SID. If the @secattr field does not contain a full SELinux |
5dbe1eb0 PM |
2878 | * SID/context then use SECINITSID_NETMSG as the foundation. If possibile the |
2879 | * 'cache' field of @secattr is set and the CACHE flag is set; this is to | |
2880 | * allow the @secattr to be used by NetLabel to cache the secattr to SID | |
2881 | * conversion for future lookups. Returns zero on success, negative values on | |
2882 | * failure. | |
7420ed23 VY |
2883 | * |
2884 | */ | |
5778eabd | 2885 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
5778eabd | 2886 | u32 *sid) |
7420ed23 VY |
2887 | { |
2888 | int rc = -EIDRM; | |
2889 | struct context *ctx; | |
2890 | struct context ctx_new; | |
5778eabd PM |
2891 | |
2892 | if (!ss_initialized) { | |
2893 | *sid = SECSID_NULL; | |
2894 | return 0; | |
2895 | } | |
7420ed23 | 2896 | |
0804d113 | 2897 | read_lock(&policy_rwlock); |
7420ed23 | 2898 | |
701a90ba | 2899 | if (secattr->flags & NETLBL_SECATTR_CACHE) { |
5dbe1eb0 PM |
2900 | *sid = *(u32 *)secattr->cache->data; |
2901 | rc = 0; | |
16efd454 PM |
2902 | } else if (secattr->flags & NETLBL_SECATTR_SECID) { |
2903 | *sid = secattr->attr.secid; | |
2904 | rc = 0; | |
701a90ba | 2905 | } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
5dbe1eb0 | 2906 | ctx = sidtab_search(&sidtab, SECINITSID_NETMSG); |
7420ed23 VY |
2907 | if (ctx == NULL) |
2908 | goto netlbl_secattr_to_sid_return; | |
2909 | ||
81990fbd | 2910 | context_init(&ctx_new); |
7420ed23 VY |
2911 | ctx_new.user = ctx->user; |
2912 | ctx_new.role = ctx->role; | |
2913 | ctx_new.type = ctx->type; | |
02752760 | 2914 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 2915 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
02752760 | 2916 | if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat, |
16efd454 | 2917 | secattr->attr.mls.cat) != 0) |
7420ed23 | 2918 | goto netlbl_secattr_to_sid_return; |
81990fbd PM |
2919 | memcpy(&ctx_new.range.level[1].cat, |
2920 | &ctx_new.range.level[0].cat, | |
2921 | sizeof(ctx_new.range.level[0].cat)); | |
7420ed23 VY |
2922 | } |
2923 | if (mls_context_isvalid(&policydb, &ctx_new) != 1) | |
2924 | goto netlbl_secattr_to_sid_return_cleanup; | |
2925 | ||
2926 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
2927 | if (rc != 0) | |
2928 | goto netlbl_secattr_to_sid_return_cleanup; | |
2929 | ||
5dbe1eb0 | 2930 | security_netlbl_cache_add(secattr, *sid); |
5778eabd | 2931 | |
7420ed23 VY |
2932 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
2933 | } else { | |
388b2405 | 2934 | *sid = SECSID_NULL; |
7420ed23 VY |
2935 | rc = 0; |
2936 | } | |
2937 | ||
2938 | netlbl_secattr_to_sid_return: | |
0804d113 | 2939 | read_unlock(&policy_rwlock); |
7420ed23 VY |
2940 | return rc; |
2941 | netlbl_secattr_to_sid_return_cleanup: | |
2942 | ebitmap_destroy(&ctx_new.range.level[0].cat); | |
2943 | goto netlbl_secattr_to_sid_return; | |
2944 | } | |
2945 | ||
2946 | /** | |
5778eabd PM |
2947 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
2948 | * @sid: the SELinux SID | |
2949 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
2950 | * |
2951 | * Description: | |
5778eabd PM |
2952 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
2953 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
2954 | * |
2955 | */ | |
5778eabd | 2956 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 | 2957 | { |
99d854d2 | 2958 | int rc; |
7420ed23 VY |
2959 | struct context *ctx; |
2960 | ||
2961 | if (!ss_initialized) | |
2962 | return 0; | |
2963 | ||
0804d113 | 2964 | read_lock(&policy_rwlock); |
7420ed23 | 2965 | ctx = sidtab_search(&sidtab, sid); |
99d854d2 PM |
2966 | if (ctx == NULL) { |
2967 | rc = -ENOENT; | |
5778eabd | 2968 | goto netlbl_sid_to_secattr_failure; |
99d854d2 | 2969 | } |
5778eabd PM |
2970 | secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], |
2971 | GFP_ATOMIC); | |
99d854d2 PM |
2972 | if (secattr->domain == NULL) { |
2973 | rc = -ENOMEM; | |
2974 | goto netlbl_sid_to_secattr_failure; | |
2975 | } | |
8d75899d PM |
2976 | secattr->attr.secid = sid; |
2977 | secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID; | |
5778eabd PM |
2978 | mls_export_netlbl_lvl(ctx, secattr); |
2979 | rc = mls_export_netlbl_cat(ctx, secattr); | |
bf0edf39 | 2980 | if (rc != 0) |
5778eabd | 2981 | goto netlbl_sid_to_secattr_failure; |
0804d113 | 2982 | read_unlock(&policy_rwlock); |
99f59ed0 | 2983 | |
5778eabd | 2984 | return 0; |
f8687afe | 2985 | |
5778eabd | 2986 | netlbl_sid_to_secattr_failure: |
0804d113 | 2987 | read_unlock(&policy_rwlock); |
f8687afe PM |
2988 | return rc; |
2989 | } | |
7420ed23 | 2990 | #endif /* CONFIG_NETLABEL */ |