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 | * | |
44c2d9bd KK |
25 | * Updated: KaiGai Kohei <kaigai@ak.jp.nec.com> |
26 | * | |
27 | * Added support for bounds domain and audit messaged on masked permissions | |
28 | * | |
29 | * Copyright (C) 2008, 2009 NEC Corporation | |
3bb56b25 | 30 | * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. |
376bd9cb | 31 | * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. |
b94c7e67 | 32 | * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC |
1da177e4 LT |
33 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> |
34 | * This program is free software; you can redistribute it and/or modify | |
5d55a345 | 35 | * it under the terms of the GNU General Public License as published by |
1da177e4 LT |
36 | * the Free Software Foundation, version 2. |
37 | */ | |
38 | #include <linux/kernel.h> | |
39 | #include <linux/slab.h> | |
40 | #include <linux/string.h> | |
41 | #include <linux/spinlock.h> | |
9f2ad665 | 42 | #include <linux/rcupdate.h> |
1da177e4 LT |
43 | #include <linux/errno.h> |
44 | #include <linux/in.h> | |
45 | #include <linux/sched.h> | |
46 | #include <linux/audit.h> | |
bb003079 | 47 | #include <linux/mutex.h> |
0e55a004 | 48 | #include <linux/selinux.h> |
7420ed23 | 49 | #include <net/netlabel.h> |
bb003079 | 50 | |
1da177e4 LT |
51 | #include "flask.h" |
52 | #include "avc.h" | |
53 | #include "avc_ss.h" | |
54 | #include "security.h" | |
55 | #include "context.h" | |
56 | #include "policydb.h" | |
57 | #include "sidtab.h" | |
58 | #include "services.h" | |
59 | #include "conditional.h" | |
60 | #include "mls.h" | |
7420ed23 | 61 | #include "objsec.h" |
c60475bf | 62 | #include "netlabel.h" |
3de4bab5 | 63 | #include "xfrm.h" |
02752760 | 64 | #include "ebitmap.h" |
9d57a7f9 | 65 | #include "audit.h" |
1da177e4 LT |
66 | |
67 | extern void selnl_notify_policyload(u32 seqno); | |
68 | unsigned int policydb_loaded_version; | |
69 | ||
3bb56b25 | 70 | int selinux_policycap_netpeer; |
b0c636b9 | 71 | int selinux_policycap_openperm; |
3bb56b25 | 72 | |
b94c7e67 CS |
73 | /* |
74 | * This is declared in avc.c | |
75 | */ | |
76 | extern const struct selinux_class_perm selinux_class_perm; | |
77 | ||
1da177e4 | 78 | static DEFINE_RWLOCK(policy_rwlock); |
1da177e4 LT |
79 | |
80 | static struct sidtab sidtab; | |
81 | struct policydb policydb; | |
5d55a345 | 82 | int ss_initialized; |
1da177e4 LT |
83 | |
84 | /* | |
85 | * The largest sequence number that has been used when | |
86 | * providing an access decision to the access vector cache. | |
87 | * The sequence number only changes when a policy change | |
88 | * occurs. | |
89 | */ | |
5d55a345 | 90 | static u32 latest_granting; |
1da177e4 LT |
91 | |
92 | /* Forward declaration. */ | |
93 | static int context_struct_to_string(struct context *context, char **scontext, | |
94 | u32 *scontext_len); | |
95 | ||
d9250dea KK |
96 | static int context_struct_compute_av(struct context *scontext, |
97 | struct context *tcontext, | |
98 | u16 tclass, | |
99 | u32 requested, | |
100 | struct av_decision *avd); | |
1da177e4 LT |
101 | /* |
102 | * Return the boolean value of a constraint expression | |
103 | * when it is applied to the specified source and target | |
104 | * security contexts. | |
105 | * | |
106 | * xcontext is a special beast... It is used by the validatetrans rules | |
107 | * only. For these rules, scontext is the context before the transition, | |
108 | * tcontext is the context after the transition, and xcontext is the context | |
109 | * of the process performing the transition. All other callers of | |
110 | * constraint_expr_eval should pass in NULL for xcontext. | |
111 | */ | |
112 | static int constraint_expr_eval(struct context *scontext, | |
113 | struct context *tcontext, | |
114 | struct context *xcontext, | |
115 | struct constraint_expr *cexpr) | |
116 | { | |
117 | u32 val1, val2; | |
118 | struct context *c; | |
119 | struct role_datum *r1, *r2; | |
120 | struct mls_level *l1, *l2; | |
121 | struct constraint_expr *e; | |
122 | int s[CEXPR_MAXDEPTH]; | |
123 | int sp = -1; | |
124 | ||
125 | for (e = cexpr; e; e = e->next) { | |
126 | switch (e->expr_type) { | |
127 | case CEXPR_NOT: | |
128 | BUG_ON(sp < 0); | |
129 | s[sp] = !s[sp]; | |
130 | break; | |
131 | case CEXPR_AND: | |
132 | BUG_ON(sp < 1); | |
133 | sp--; | |
134 | s[sp] &= s[sp+1]; | |
135 | break; | |
136 | case CEXPR_OR: | |
137 | BUG_ON(sp < 1); | |
138 | sp--; | |
139 | s[sp] |= s[sp+1]; | |
140 | break; | |
141 | case CEXPR_ATTR: | |
142 | if (sp == (CEXPR_MAXDEPTH-1)) | |
143 | return 0; | |
144 | switch (e->attr) { | |
145 | case CEXPR_USER: | |
146 | val1 = scontext->user; | |
147 | val2 = tcontext->user; | |
148 | break; | |
149 | case CEXPR_TYPE: | |
150 | val1 = scontext->type; | |
151 | val2 = tcontext->type; | |
152 | break; | |
153 | case CEXPR_ROLE: | |
154 | val1 = scontext->role; | |
155 | val2 = tcontext->role; | |
156 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
157 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
158 | switch (e->op) { | |
159 | case CEXPR_DOM: | |
160 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
161 | val2 - 1); | |
162 | continue; | |
163 | case CEXPR_DOMBY: | |
164 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
165 | val1 - 1); | |
166 | continue; | |
167 | case CEXPR_INCOMP: | |
5d55a345 EP |
168 | s[++sp] = (!ebitmap_get_bit(&r1->dominates, |
169 | val2 - 1) && | |
170 | !ebitmap_get_bit(&r2->dominates, | |
171 | val1 - 1)); | |
1da177e4 LT |
172 | continue; |
173 | default: | |
174 | break; | |
175 | } | |
176 | break; | |
177 | case CEXPR_L1L2: | |
178 | l1 = &(scontext->range.level[0]); | |
179 | l2 = &(tcontext->range.level[0]); | |
180 | goto mls_ops; | |
181 | case CEXPR_L1H2: | |
182 | l1 = &(scontext->range.level[0]); | |
183 | l2 = &(tcontext->range.level[1]); | |
184 | goto mls_ops; | |
185 | case CEXPR_H1L2: | |
186 | l1 = &(scontext->range.level[1]); | |
187 | l2 = &(tcontext->range.level[0]); | |
188 | goto mls_ops; | |
189 | case CEXPR_H1H2: | |
190 | l1 = &(scontext->range.level[1]); | |
191 | l2 = &(tcontext->range.level[1]); | |
192 | goto mls_ops; | |
193 | case CEXPR_L1H1: | |
194 | l1 = &(scontext->range.level[0]); | |
195 | l2 = &(scontext->range.level[1]); | |
196 | goto mls_ops; | |
197 | case CEXPR_L2H2: | |
198 | l1 = &(tcontext->range.level[0]); | |
199 | l2 = &(tcontext->range.level[1]); | |
200 | goto mls_ops; | |
201 | mls_ops: | |
202 | switch (e->op) { | |
203 | case CEXPR_EQ: | |
204 | s[++sp] = mls_level_eq(l1, l2); | |
205 | continue; | |
206 | case CEXPR_NEQ: | |
207 | s[++sp] = !mls_level_eq(l1, l2); | |
208 | continue; | |
209 | case CEXPR_DOM: | |
210 | s[++sp] = mls_level_dom(l1, l2); | |
211 | continue; | |
212 | case CEXPR_DOMBY: | |
213 | s[++sp] = mls_level_dom(l2, l1); | |
214 | continue; | |
215 | case CEXPR_INCOMP: | |
216 | s[++sp] = mls_level_incomp(l2, l1); | |
217 | continue; | |
218 | default: | |
219 | BUG(); | |
220 | return 0; | |
221 | } | |
222 | break; | |
223 | default: | |
224 | BUG(); | |
225 | return 0; | |
226 | } | |
227 | ||
228 | switch (e->op) { | |
229 | case CEXPR_EQ: | |
230 | s[++sp] = (val1 == val2); | |
231 | break; | |
232 | case CEXPR_NEQ: | |
233 | s[++sp] = (val1 != val2); | |
234 | break; | |
235 | default: | |
236 | BUG(); | |
237 | return 0; | |
238 | } | |
239 | break; | |
240 | case CEXPR_NAMES: | |
241 | if (sp == (CEXPR_MAXDEPTH-1)) | |
242 | return 0; | |
243 | c = scontext; | |
244 | if (e->attr & CEXPR_TARGET) | |
245 | c = tcontext; | |
246 | else if (e->attr & CEXPR_XTARGET) { | |
247 | c = xcontext; | |
248 | if (!c) { | |
249 | BUG(); | |
250 | return 0; | |
251 | } | |
252 | } | |
253 | if (e->attr & CEXPR_USER) | |
254 | val1 = c->user; | |
255 | else if (e->attr & CEXPR_ROLE) | |
256 | val1 = c->role; | |
257 | else if (e->attr & CEXPR_TYPE) | |
258 | val1 = c->type; | |
259 | else { | |
260 | BUG(); | |
261 | return 0; | |
262 | } | |
263 | ||
264 | switch (e->op) { | |
265 | case CEXPR_EQ: | |
266 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
267 | break; | |
268 | case CEXPR_NEQ: | |
269 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
270 | break; | |
271 | default: | |
272 | BUG(); | |
273 | return 0; | |
274 | } | |
275 | break; | |
276 | default: | |
277 | BUG(); | |
278 | return 0; | |
279 | } | |
280 | } | |
281 | ||
282 | BUG_ON(sp != 0); | |
283 | return s[0]; | |
284 | } | |
285 | ||
44c2d9bd KK |
286 | /* |
287 | * security_dump_masked_av - dumps masked permissions during | |
288 | * security_compute_av due to RBAC, MLS/Constraint and Type bounds. | |
289 | */ | |
290 | static int dump_masked_av_helper(void *k, void *d, void *args) | |
291 | { | |
292 | struct perm_datum *pdatum = d; | |
293 | char **permission_names = args; | |
294 | ||
295 | BUG_ON(pdatum->value < 1 || pdatum->value > 32); | |
296 | ||
297 | permission_names[pdatum->value - 1] = (char *)k; | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
302 | static void security_dump_masked_av(struct context *scontext, | |
303 | struct context *tcontext, | |
304 | u16 tclass, | |
305 | u32 permissions, | |
306 | const char *reason) | |
307 | { | |
308 | struct common_datum *common_dat; | |
309 | struct class_datum *tclass_dat; | |
310 | struct audit_buffer *ab; | |
311 | char *tclass_name; | |
312 | char *scontext_name = NULL; | |
313 | char *tcontext_name = NULL; | |
314 | char *permission_names[32]; | |
315 | int index, length; | |
316 | bool need_comma = false; | |
317 | ||
318 | if (!permissions) | |
319 | return; | |
320 | ||
321 | tclass_name = policydb.p_class_val_to_name[tclass - 1]; | |
322 | tclass_dat = policydb.class_val_to_struct[tclass - 1]; | |
323 | common_dat = tclass_dat->comdatum; | |
324 | ||
325 | /* init permission_names */ | |
326 | if (common_dat && | |
327 | hashtab_map(common_dat->permissions.table, | |
328 | dump_masked_av_helper, permission_names) < 0) | |
329 | goto out; | |
330 | ||
331 | if (hashtab_map(tclass_dat->permissions.table, | |
332 | dump_masked_av_helper, permission_names) < 0) | |
333 | goto out; | |
334 | ||
335 | /* get scontext/tcontext in text form */ | |
336 | if (context_struct_to_string(scontext, | |
337 | &scontext_name, &length) < 0) | |
338 | goto out; | |
339 | ||
340 | if (context_struct_to_string(tcontext, | |
341 | &tcontext_name, &length) < 0) | |
342 | goto out; | |
343 | ||
344 | /* audit a message */ | |
345 | ab = audit_log_start(current->audit_context, | |
346 | GFP_ATOMIC, AUDIT_SELINUX_ERR); | |
347 | if (!ab) | |
348 | goto out; | |
349 | ||
350 | audit_log_format(ab, "op=security_compute_av reason=%s " | |
351 | "scontext=%s tcontext=%s tclass=%s perms=", | |
352 | reason, scontext_name, tcontext_name, tclass_name); | |
353 | ||
354 | for (index = 0; index < 32; index++) { | |
355 | u32 mask = (1 << index); | |
356 | ||
357 | if ((mask & permissions) == 0) | |
358 | continue; | |
359 | ||
360 | audit_log_format(ab, "%s%s", | |
361 | need_comma ? "," : "", | |
362 | permission_names[index] | |
363 | ? permission_names[index] : "????"); | |
364 | need_comma = true; | |
365 | } | |
366 | audit_log_end(ab); | |
367 | out: | |
368 | /* release scontext/tcontext */ | |
369 | kfree(tcontext_name); | |
370 | kfree(scontext_name); | |
371 | ||
372 | return; | |
373 | } | |
374 | ||
d9250dea KK |
375 | /* |
376 | * security_boundary_permission - drops violated permissions | |
377 | * on boundary constraint. | |
378 | */ | |
379 | static void type_attribute_bounds_av(struct context *scontext, | |
380 | struct context *tcontext, | |
381 | u16 tclass, | |
382 | u32 requested, | |
383 | struct av_decision *avd) | |
384 | { | |
385 | struct context lo_scontext; | |
386 | struct context lo_tcontext; | |
387 | struct av_decision lo_avd; | |
388 | struct type_datum *source | |
389 | = policydb.type_val_to_struct[scontext->type - 1]; | |
390 | struct type_datum *target | |
391 | = policydb.type_val_to_struct[tcontext->type - 1]; | |
392 | u32 masked = 0; | |
393 | ||
394 | if (source->bounds) { | |
395 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
396 | ||
397 | memcpy(&lo_scontext, scontext, sizeof(lo_scontext)); | |
398 | lo_scontext.type = source->bounds; | |
399 | ||
400 | context_struct_compute_av(&lo_scontext, | |
401 | tcontext, | |
402 | tclass, | |
403 | requested, | |
404 | &lo_avd); | |
405 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
406 | return; /* no masked permission */ | |
407 | masked = ~lo_avd.allowed & avd->allowed; | |
408 | } | |
409 | ||
410 | if (target->bounds) { | |
411 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
412 | ||
413 | memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext)); | |
414 | lo_tcontext.type = target->bounds; | |
415 | ||
416 | context_struct_compute_av(scontext, | |
417 | &lo_tcontext, | |
418 | tclass, | |
419 | requested, | |
420 | &lo_avd); | |
421 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
422 | return; /* no masked permission */ | |
423 | masked = ~lo_avd.allowed & avd->allowed; | |
424 | } | |
425 | ||
426 | if (source->bounds && target->bounds) { | |
427 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
428 | /* | |
429 | * lo_scontext and lo_tcontext are already | |
430 | * set up. | |
431 | */ | |
432 | ||
433 | context_struct_compute_av(&lo_scontext, | |
434 | &lo_tcontext, | |
435 | tclass, | |
436 | requested, | |
437 | &lo_avd); | |
438 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
439 | return; /* no masked permission */ | |
440 | masked = ~lo_avd.allowed & avd->allowed; | |
441 | } | |
442 | ||
443 | if (masked) { | |
d9250dea KK |
444 | /* mask violated permissions */ |
445 | avd->allowed &= ~masked; | |
446 | ||
44c2d9bd KK |
447 | /* audit masked permissions */ |
448 | security_dump_masked_av(scontext, tcontext, | |
449 | tclass, masked, "bounds"); | |
d9250dea KK |
450 | } |
451 | } | |
452 | ||
1da177e4 LT |
453 | /* |
454 | * Compute access vectors based on a context structure pair for | |
455 | * the permissions in a particular class. | |
456 | */ | |
457 | static int context_struct_compute_av(struct context *scontext, | |
458 | struct context *tcontext, | |
459 | u16 tclass, | |
460 | u32 requested, | |
461 | struct av_decision *avd) | |
462 | { | |
463 | struct constraint_node *constraint; | |
464 | struct role_allow *ra; | |
465 | struct avtab_key avkey; | |
782ebb99 | 466 | struct avtab_node *node; |
1da177e4 | 467 | struct class_datum *tclass_datum; |
782ebb99 SS |
468 | struct ebitmap *sattr, *tattr; |
469 | struct ebitmap_node *snode, *tnode; | |
3f12070e | 470 | const struct selinux_class_perm *kdefs = &selinux_class_perm; |
782ebb99 | 471 | unsigned int i, j; |
1da177e4 LT |
472 | |
473 | /* | |
474 | * Remap extended Netlink classes for old policy versions. | |
475 | * Do this here rather than socket_type_to_security_class() | |
476 | * in case a newer policy version is loaded, allowing sockets | |
477 | * to remain in the correct class. | |
478 | */ | |
479 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
480 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
481 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
482 | tclass = SECCLASS_NETLINK_SOCKET; | |
483 | ||
1da177e4 LT |
484 | /* |
485 | * Initialize the access vectors to the default values. | |
486 | */ | |
487 | avd->allowed = 0; | |
1da177e4 LT |
488 | avd->auditallow = 0; |
489 | avd->auditdeny = 0xffffffff; | |
490 | avd->seqno = latest_granting; | |
8a6f83af | 491 | avd->flags = 0; |
1da177e4 | 492 | |
3f12070e EP |
493 | /* |
494 | * Check for all the invalid cases. | |
495 | * - tclass 0 | |
496 | * - tclass > policy and > kernel | |
497 | * - tclass > policy but is a userspace class | |
498 | * - tclass > policy but we do not allow unknowns | |
499 | */ | |
500 | if (unlikely(!tclass)) | |
501 | goto inval_class; | |
502 | if (unlikely(tclass > policydb.p_classes.nprim)) | |
503 | if (tclass > kdefs->cts_len || | |
cea78dc4 | 504 | !kdefs->class_to_string[tclass] || |
3f12070e EP |
505 | !policydb.allow_unknown) |
506 | goto inval_class; | |
507 | ||
508 | /* | |
509 | * Kernel class and we allow unknown so pad the allow decision | |
510 | * the pad will be all 1 for unknown classes. | |
511 | */ | |
512 | if (tclass <= kdefs->cts_len && policydb.allow_unknown) | |
513 | avd->allowed = policydb.undefined_perms[tclass - 1]; | |
514 | ||
515 | /* | |
516 | * Not in policy. Since decision is completed (all 1 or all 0) return. | |
517 | */ | |
518 | if (unlikely(tclass > policydb.p_classes.nprim)) | |
519 | return 0; | |
520 | ||
521 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
522 | ||
1da177e4 LT |
523 | /* |
524 | * If a specific type enforcement rule was defined for | |
525 | * this permission check, then use it. | |
526 | */ | |
1da177e4 | 527 | avkey.target_class = tclass; |
782ebb99 SS |
528 | avkey.specified = AVTAB_AV; |
529 | sattr = &policydb.type_attr_map[scontext->type - 1]; | |
530 | tattr = &policydb.type_attr_map[tcontext->type - 1]; | |
9fe79ad1 KK |
531 | ebitmap_for_each_positive_bit(sattr, snode, i) { |
532 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
782ebb99 SS |
533 | avkey.source_type = i + 1; |
534 | avkey.target_type = j + 1; | |
535 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
dbc74c65 | 536 | node; |
782ebb99 SS |
537 | node = avtab_search_node_next(node, avkey.specified)) { |
538 | if (node->key.specified == AVTAB_ALLOWED) | |
539 | avd->allowed |= node->datum.data; | |
540 | else if (node->key.specified == AVTAB_AUDITALLOW) | |
541 | avd->auditallow |= node->datum.data; | |
542 | else if (node->key.specified == AVTAB_AUDITDENY) | |
543 | avd->auditdeny &= node->datum.data; | |
544 | } | |
1da177e4 | 545 | |
782ebb99 SS |
546 | /* Check conditional av table for additional permissions */ |
547 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); | |
548 | ||
549 | } | |
550 | } | |
1da177e4 LT |
551 | |
552 | /* | |
553 | * Remove any permissions prohibited by a constraint (this includes | |
554 | * the MLS policy). | |
555 | */ | |
556 | constraint = tclass_datum->constraints; | |
557 | while (constraint) { | |
558 | if ((constraint->permissions & (avd->allowed)) && | |
559 | !constraint_expr_eval(scontext, tcontext, NULL, | |
560 | constraint->expr)) { | |
caabbdc0 | 561 | avd->allowed &= ~(constraint->permissions); |
1da177e4 LT |
562 | } |
563 | constraint = constraint->next; | |
564 | } | |
565 | ||
566 | /* | |
567 | * If checking process transition permission and the | |
568 | * role is changing, then check the (current_role, new_role) | |
569 | * pair. | |
570 | */ | |
571 | if (tclass == SECCLASS_PROCESS && | |
572 | (avd->allowed & (PROCESS__TRANSITION | PROCESS__DYNTRANSITION)) && | |
573 | scontext->role != tcontext->role) { | |
574 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
575 | if (scontext->role == ra->role && | |
576 | tcontext->role == ra->new_role) | |
577 | break; | |
578 | } | |
579 | if (!ra) | |
caabbdc0 KK |
580 | avd->allowed &= ~(PROCESS__TRANSITION | |
581 | PROCESS__DYNTRANSITION); | |
1da177e4 LT |
582 | } |
583 | ||
d9250dea KK |
584 | /* |
585 | * If the given source and target types have boundary | |
586 | * constraint, lazy checks have to mask any violated | |
587 | * permission and notice it to userspace via audit. | |
588 | */ | |
589 | type_attribute_bounds_av(scontext, tcontext, | |
590 | tclass, requested, avd); | |
591 | ||
1da177e4 | 592 | return 0; |
3f12070e EP |
593 | |
594 | inval_class: | |
22df4adb SS |
595 | if (!tclass || tclass > kdefs->cts_len || |
596 | !kdefs->class_to_string[tclass]) { | |
597 | if (printk_ratelimit()) | |
598 | printk(KERN_ERR "SELinux: %s: unrecognized class %d\n", | |
599 | __func__, tclass); | |
600 | return -EINVAL; | |
601 | } | |
602 | ||
603 | /* | |
604 | * Known to the kernel, but not to the policy. | |
605 | * Handle as a denial (allowed is 0). | |
606 | */ | |
607 | return 0; | |
1da177e4 LT |
608 | } |
609 | ||
610 | static int security_validtrans_handle_fail(struct context *ocontext, | |
5d55a345 EP |
611 | struct context *ncontext, |
612 | struct context *tcontext, | |
613 | u16 tclass) | |
1da177e4 LT |
614 | { |
615 | char *o = NULL, *n = NULL, *t = NULL; | |
616 | u32 olen, nlen, tlen; | |
617 | ||
618 | if (context_struct_to_string(ocontext, &o, &olen) < 0) | |
619 | goto out; | |
620 | if (context_struct_to_string(ncontext, &n, &nlen) < 0) | |
621 | goto out; | |
622 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
623 | goto out; | |
9ad9ad38 | 624 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
5d55a345 EP |
625 | "security_validate_transition: denied for" |
626 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", | |
627 | o, n, t, policydb.p_class_val_to_name[tclass-1]); | |
1da177e4 LT |
628 | out: |
629 | kfree(o); | |
630 | kfree(n); | |
631 | kfree(t); | |
632 | ||
633 | if (!selinux_enforcing) | |
634 | return 0; | |
635 | return -EPERM; | |
636 | } | |
637 | ||
638 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
5d55a345 | 639 | u16 tclass) |
1da177e4 LT |
640 | { |
641 | struct context *ocontext; | |
642 | struct context *ncontext; | |
643 | struct context *tcontext; | |
644 | struct class_datum *tclass_datum; | |
645 | struct constraint_node *constraint; | |
646 | int rc = 0; | |
647 | ||
648 | if (!ss_initialized) | |
649 | return 0; | |
650 | ||
0804d113 | 651 | read_lock(&policy_rwlock); |
1da177e4 LT |
652 | |
653 | /* | |
654 | * Remap extended Netlink classes for old policy versions. | |
655 | * Do this here rather than socket_type_to_security_class() | |
656 | * in case a newer policy version is loaded, allowing sockets | |
657 | * to remain in the correct class. | |
658 | */ | |
659 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
660 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
661 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
662 | tclass = SECCLASS_NETLINK_SOCKET; | |
663 | ||
664 | if (!tclass || tclass > policydb.p_classes.nprim) { | |
744ba35e EP |
665 | printk(KERN_ERR "SELinux: %s: unrecognized class %d\n", |
666 | __func__, tclass); | |
1da177e4 LT |
667 | rc = -EINVAL; |
668 | goto out; | |
669 | } | |
670 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
671 | ||
672 | ocontext = sidtab_search(&sidtab, oldsid); | |
673 | if (!ocontext) { | |
744ba35e EP |
674 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
675 | __func__, oldsid); | |
1da177e4 LT |
676 | rc = -EINVAL; |
677 | goto out; | |
678 | } | |
679 | ||
680 | ncontext = sidtab_search(&sidtab, newsid); | |
681 | if (!ncontext) { | |
744ba35e EP |
682 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
683 | __func__, newsid); | |
1da177e4 LT |
684 | rc = -EINVAL; |
685 | goto out; | |
686 | } | |
687 | ||
688 | tcontext = sidtab_search(&sidtab, tasksid); | |
689 | if (!tcontext) { | |
744ba35e EP |
690 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
691 | __func__, tasksid); | |
1da177e4 LT |
692 | rc = -EINVAL; |
693 | goto out; | |
694 | } | |
695 | ||
696 | constraint = tclass_datum->validatetrans; | |
697 | while (constraint) { | |
698 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
5d55a345 | 699 | constraint->expr)) { |
1da177e4 | 700 | rc = security_validtrans_handle_fail(ocontext, ncontext, |
5d55a345 | 701 | tcontext, tclass); |
1da177e4 LT |
702 | goto out; |
703 | } | |
704 | constraint = constraint->next; | |
705 | } | |
706 | ||
707 | out: | |
0804d113 | 708 | read_unlock(&policy_rwlock); |
1da177e4 LT |
709 | return rc; |
710 | } | |
711 | ||
d9250dea KK |
712 | /* |
713 | * security_bounded_transition - check whether the given | |
714 | * transition is directed to bounded, or not. | |
715 | * It returns 0, if @newsid is bounded by @oldsid. | |
716 | * Otherwise, it returns error code. | |
717 | * | |
718 | * @oldsid : current security identifier | |
719 | * @newsid : destinated security identifier | |
720 | */ | |
721 | int security_bounded_transition(u32 old_sid, u32 new_sid) | |
722 | { | |
723 | struct context *old_context, *new_context; | |
724 | struct type_datum *type; | |
725 | int index; | |
726 | int rc = -EINVAL; | |
727 | ||
728 | read_lock(&policy_rwlock); | |
729 | ||
730 | old_context = sidtab_search(&sidtab, old_sid); | |
731 | if (!old_context) { | |
732 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
733 | __func__, old_sid); | |
734 | goto out; | |
735 | } | |
736 | ||
737 | new_context = sidtab_search(&sidtab, new_sid); | |
738 | if (!new_context) { | |
739 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
740 | __func__, new_sid); | |
741 | goto out; | |
742 | } | |
743 | ||
744 | /* type/domain unchaned */ | |
745 | if (old_context->type == new_context->type) { | |
746 | rc = 0; | |
747 | goto out; | |
748 | } | |
749 | ||
750 | index = new_context->type; | |
751 | while (true) { | |
752 | type = policydb.type_val_to_struct[index - 1]; | |
753 | BUG_ON(!type); | |
754 | ||
755 | /* not bounded anymore */ | |
756 | if (!type->bounds) { | |
757 | rc = -EPERM; | |
758 | break; | |
759 | } | |
760 | ||
761 | /* @newsid is bounded by @oldsid */ | |
762 | if (type->bounds == old_context->type) { | |
763 | rc = 0; | |
764 | break; | |
765 | } | |
766 | index = type->bounds; | |
767 | } | |
44c2d9bd KK |
768 | |
769 | if (rc) { | |
770 | char *old_name = NULL; | |
771 | char *new_name = NULL; | |
772 | int length; | |
773 | ||
774 | if (!context_struct_to_string(old_context, | |
775 | &old_name, &length) && | |
776 | !context_struct_to_string(new_context, | |
777 | &new_name, &length)) { | |
778 | audit_log(current->audit_context, | |
779 | GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
780 | "op=security_bounded_transition " | |
781 | "result=denied " | |
782 | "oldcontext=%s newcontext=%s", | |
783 | old_name, new_name); | |
784 | } | |
785 | kfree(new_name); | |
786 | kfree(old_name); | |
787 | } | |
d9250dea KK |
788 | out: |
789 | read_unlock(&policy_rwlock); | |
790 | ||
791 | return rc; | |
792 | } | |
793 | ||
794 | ||
1da177e4 LT |
795 | /** |
796 | * security_compute_av - Compute access vector decisions. | |
797 | * @ssid: source security identifier | |
798 | * @tsid: target security identifier | |
799 | * @tclass: target security class | |
800 | * @requested: requested permissions | |
801 | * @avd: access vector decisions | |
802 | * | |
803 | * Compute a set of access vector decisions based on the | |
804 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
805 | * Return -%EINVAL if any of the parameters are invalid or %0 | |
806 | * if the access vector decisions were computed successfully. | |
807 | */ | |
808 | int security_compute_av(u32 ssid, | |
809 | u32 tsid, | |
810 | u16 tclass, | |
811 | u32 requested, | |
812 | struct av_decision *avd) | |
813 | { | |
814 | struct context *scontext = NULL, *tcontext = NULL; | |
815 | int rc = 0; | |
816 | ||
817 | if (!ss_initialized) { | |
4c443d1b | 818 | avd->allowed = 0xffffffff; |
1da177e4 LT |
819 | avd->auditallow = 0; |
820 | avd->auditdeny = 0xffffffff; | |
821 | avd->seqno = latest_granting; | |
822 | return 0; | |
823 | } | |
824 | ||
0804d113 | 825 | read_lock(&policy_rwlock); |
1da177e4 LT |
826 | |
827 | scontext = sidtab_search(&sidtab, ssid); | |
828 | if (!scontext) { | |
744ba35e EP |
829 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
830 | __func__, ssid); | |
1da177e4 LT |
831 | rc = -EINVAL; |
832 | goto out; | |
833 | } | |
834 | tcontext = sidtab_search(&sidtab, tsid); | |
835 | if (!tcontext) { | |
744ba35e EP |
836 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
837 | __func__, tsid); | |
1da177e4 LT |
838 | rc = -EINVAL; |
839 | goto out; | |
840 | } | |
841 | ||
842 | rc = context_struct_compute_av(scontext, tcontext, tclass, | |
843 | requested, avd); | |
8a6f83af KK |
844 | |
845 | /* permissive domain? */ | |
846 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
847 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
1da177e4 | 848 | out: |
0804d113 | 849 | read_unlock(&policy_rwlock); |
1da177e4 LT |
850 | return rc; |
851 | } | |
852 | ||
853 | /* | |
854 | * Write the security context string representation of | |
855 | * the context structure `context' into a dynamically | |
856 | * allocated string of the correct size. Set `*scontext' | |
857 | * to point to this string and set `*scontext_len' to | |
858 | * the length of the string. | |
859 | */ | |
860 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
861 | { | |
862 | char *scontextp; | |
863 | ||
864 | *scontext = NULL; | |
865 | *scontext_len = 0; | |
866 | ||
12b29f34 SS |
867 | if (context->len) { |
868 | *scontext_len = context->len; | |
869 | *scontext = kstrdup(context->str, GFP_ATOMIC); | |
870 | if (!(*scontext)) | |
871 | return -ENOMEM; | |
872 | return 0; | |
873 | } | |
874 | ||
1da177e4 LT |
875 | /* Compute the size of the context. */ |
876 | *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; | |
877 | *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; | |
878 | *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; | |
879 | *scontext_len += mls_compute_context_len(context); | |
880 | ||
881 | /* Allocate space for the context; caller must free this space. */ | |
882 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
5d55a345 | 883 | if (!scontextp) |
1da177e4 | 884 | return -ENOMEM; |
1da177e4 LT |
885 | *scontext = scontextp; |
886 | ||
887 | /* | |
888 | * Copy the user name, role name and type name into the context. | |
889 | */ | |
890 | sprintf(scontextp, "%s:%s:%s", | |
891 | policydb.p_user_val_to_name[context->user - 1], | |
892 | policydb.p_role_val_to_name[context->role - 1], | |
893 | policydb.p_type_val_to_name[context->type - 1]); | |
894 | scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + | |
5d55a345 EP |
895 | 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + |
896 | 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); | |
1da177e4 LT |
897 | |
898 | mls_sid_to_context(context, &scontextp); | |
899 | ||
900 | *scontextp = 0; | |
901 | ||
902 | return 0; | |
903 | } | |
904 | ||
905 | #include "initial_sid_to_string.h" | |
906 | ||
f0ee2e46 JC |
907 | const char *security_get_initial_sid_context(u32 sid) |
908 | { | |
909 | if (unlikely(sid > SECINITSID_NUM)) | |
910 | return NULL; | |
911 | return initial_sid_to_string[sid]; | |
912 | } | |
913 | ||
12b29f34 SS |
914 | static int security_sid_to_context_core(u32 sid, char **scontext, |
915 | u32 *scontext_len, int force) | |
1da177e4 LT |
916 | { |
917 | struct context *context; | |
918 | int rc = 0; | |
919 | ||
4f4acf3a SS |
920 | *scontext = NULL; |
921 | *scontext_len = 0; | |
922 | ||
1da177e4 LT |
923 | if (!ss_initialized) { |
924 | if (sid <= SECINITSID_NUM) { | |
925 | char *scontextp; | |
926 | ||
927 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
5d55a345 | 928 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); |
0cccca06 SH |
929 | if (!scontextp) { |
930 | rc = -ENOMEM; | |
931 | goto out; | |
932 | } | |
1da177e4 LT |
933 | strcpy(scontextp, initial_sid_to_string[sid]); |
934 | *scontext = scontextp; | |
935 | goto out; | |
936 | } | |
744ba35e EP |
937 | printk(KERN_ERR "SELinux: %s: called before initial " |
938 | "load_policy on unknown SID %d\n", __func__, sid); | |
1da177e4 LT |
939 | rc = -EINVAL; |
940 | goto out; | |
941 | } | |
0804d113 | 942 | read_lock(&policy_rwlock); |
12b29f34 SS |
943 | if (force) |
944 | context = sidtab_search_force(&sidtab, sid); | |
945 | else | |
946 | context = sidtab_search(&sidtab, sid); | |
1da177e4 | 947 | if (!context) { |
744ba35e EP |
948 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
949 | __func__, sid); | |
1da177e4 LT |
950 | rc = -EINVAL; |
951 | goto out_unlock; | |
952 | } | |
953 | rc = context_struct_to_string(context, scontext, scontext_len); | |
954 | out_unlock: | |
0804d113 | 955 | read_unlock(&policy_rwlock); |
1da177e4 LT |
956 | out: |
957 | return rc; | |
958 | ||
959 | } | |
960 | ||
12b29f34 SS |
961 | /** |
962 | * security_sid_to_context - Obtain a context for a given SID. | |
963 | * @sid: security identifier, SID | |
964 | * @scontext: security context | |
965 | * @scontext_len: length in bytes | |
966 | * | |
967 | * Write the string representation of the context associated with @sid | |
968 | * into a dynamically allocated string of the correct size. Set @scontext | |
969 | * to point to this string and set @scontext_len to the length of the string. | |
970 | */ | |
971 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
1da177e4 | 972 | { |
12b29f34 SS |
973 | return security_sid_to_context_core(sid, scontext, scontext_len, 0); |
974 | } | |
975 | ||
976 | int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len) | |
977 | { | |
978 | return security_sid_to_context_core(sid, scontext, scontext_len, 1); | |
979 | } | |
980 | ||
9a59daa0 SS |
981 | /* |
982 | * Caveat: Mutates scontext. | |
983 | */ | |
12b29f34 SS |
984 | static int string_to_context_struct(struct policydb *pol, |
985 | struct sidtab *sidtabp, | |
9a59daa0 | 986 | char *scontext, |
12b29f34 SS |
987 | u32 scontext_len, |
988 | struct context *ctx, | |
9a59daa0 | 989 | u32 def_sid) |
12b29f34 | 990 | { |
1da177e4 LT |
991 | struct role_datum *role; |
992 | struct type_datum *typdatum; | |
993 | struct user_datum *usrdatum; | |
994 | char *scontextp, *p, oldc; | |
995 | int rc = 0; | |
996 | ||
12b29f34 | 997 | context_init(ctx); |
1da177e4 | 998 | |
1da177e4 LT |
999 | /* Parse the security context. */ |
1000 | ||
1001 | rc = -EINVAL; | |
9a59daa0 | 1002 | scontextp = (char *) scontext; |
1da177e4 LT |
1003 | |
1004 | /* Extract the user. */ | |
1005 | p = scontextp; | |
1006 | while (*p && *p != ':') | |
1007 | p++; | |
1008 | ||
1009 | if (*p == 0) | |
12b29f34 | 1010 | goto out; |
1da177e4 LT |
1011 | |
1012 | *p++ = 0; | |
1013 | ||
12b29f34 | 1014 | usrdatum = hashtab_search(pol->p_users.table, scontextp); |
1da177e4 | 1015 | if (!usrdatum) |
12b29f34 | 1016 | goto out; |
1da177e4 | 1017 | |
12b29f34 | 1018 | ctx->user = usrdatum->value; |
1da177e4 LT |
1019 | |
1020 | /* Extract role. */ | |
1021 | scontextp = p; | |
1022 | while (*p && *p != ':') | |
1023 | p++; | |
1024 | ||
1025 | if (*p == 0) | |
12b29f34 | 1026 | goto out; |
1da177e4 LT |
1027 | |
1028 | *p++ = 0; | |
1029 | ||
12b29f34 | 1030 | role = hashtab_search(pol->p_roles.table, scontextp); |
1da177e4 | 1031 | if (!role) |
12b29f34 SS |
1032 | goto out; |
1033 | ctx->role = role->value; | |
1da177e4 LT |
1034 | |
1035 | /* Extract type. */ | |
1036 | scontextp = p; | |
1037 | while (*p && *p != ':') | |
1038 | p++; | |
1039 | oldc = *p; | |
1040 | *p++ = 0; | |
1041 | ||
12b29f34 | 1042 | typdatum = hashtab_search(pol->p_types.table, scontextp); |
d9250dea | 1043 | if (!typdatum || typdatum->attribute) |
12b29f34 | 1044 | goto out; |
1da177e4 | 1045 | |
12b29f34 | 1046 | ctx->type = typdatum->value; |
1da177e4 | 1047 | |
12b29f34 | 1048 | rc = mls_context_to_sid(pol, oldc, &p, ctx, sidtabp, def_sid); |
1da177e4 | 1049 | if (rc) |
12b29f34 | 1050 | goto out; |
1da177e4 | 1051 | |
9a59daa0 | 1052 | if ((p - scontext) < scontext_len) { |
1da177e4 | 1053 | rc = -EINVAL; |
12b29f34 | 1054 | goto out; |
1da177e4 LT |
1055 | } |
1056 | ||
1057 | /* Check the validity of the new context. */ | |
12b29f34 | 1058 | if (!policydb_context_isvalid(pol, ctx)) { |
1da177e4 | 1059 | rc = -EINVAL; |
12b29f34 | 1060 | goto out; |
1da177e4 | 1061 | } |
12b29f34 SS |
1062 | rc = 0; |
1063 | out: | |
8e531af9 EP |
1064 | if (rc) |
1065 | context_destroy(ctx); | |
12b29f34 SS |
1066 | return rc; |
1067 | } | |
1068 | ||
1069 | static int security_context_to_sid_core(const char *scontext, u32 scontext_len, | |
1070 | u32 *sid, u32 def_sid, gfp_t gfp_flags, | |
1071 | int force) | |
1072 | { | |
9a59daa0 | 1073 | char *scontext2, *str = NULL; |
12b29f34 SS |
1074 | struct context context; |
1075 | int rc = 0; | |
1076 | ||
1077 | if (!ss_initialized) { | |
1078 | int i; | |
1079 | ||
1080 | for (i = 1; i < SECINITSID_NUM; i++) { | |
1081 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
1082 | *sid = i; | |
9a59daa0 | 1083 | return 0; |
12b29f34 SS |
1084 | } |
1085 | } | |
1086 | *sid = SECINITSID_KERNEL; | |
9a59daa0 | 1087 | return 0; |
12b29f34 SS |
1088 | } |
1089 | *sid = SECSID_NULL; | |
1090 | ||
9a59daa0 SS |
1091 | /* Copy the string so that we can modify the copy as we parse it. */ |
1092 | scontext2 = kmalloc(scontext_len+1, gfp_flags); | |
1093 | if (!scontext2) | |
1094 | return -ENOMEM; | |
1095 | memcpy(scontext2, scontext, scontext_len); | |
1096 | scontext2[scontext_len] = 0; | |
1097 | ||
1098 | if (force) { | |
1099 | /* Save another copy for storing in uninterpreted form */ | |
1100 | str = kstrdup(scontext2, gfp_flags); | |
1101 | if (!str) { | |
1102 | kfree(scontext2); | |
1103 | return -ENOMEM; | |
1104 | } | |
1105 | } | |
1106 | ||
0804d113 | 1107 | read_lock(&policy_rwlock); |
12b29f34 | 1108 | rc = string_to_context_struct(&policydb, &sidtab, |
9a59daa0 SS |
1109 | scontext2, scontext_len, |
1110 | &context, def_sid); | |
12b29f34 | 1111 | if (rc == -EINVAL && force) { |
9a59daa0 | 1112 | context.str = str; |
12b29f34 | 1113 | context.len = scontext_len; |
9a59daa0 | 1114 | str = NULL; |
12b29f34 SS |
1115 | } else if (rc) |
1116 | goto out; | |
1117 | rc = sidtab_context_to_sid(&sidtab, &context, sid); | |
8e531af9 | 1118 | context_destroy(&context); |
1da177e4 | 1119 | out: |
0804d113 | 1120 | read_unlock(&policy_rwlock); |
9a59daa0 SS |
1121 | kfree(scontext2); |
1122 | kfree(str); | |
1da177e4 LT |
1123 | return rc; |
1124 | } | |
1125 | ||
f5c1d5b2 JM |
1126 | /** |
1127 | * security_context_to_sid - Obtain a SID for a given security context. | |
1128 | * @scontext: security context | |
1129 | * @scontext_len: length in bytes | |
1130 | * @sid: security identifier, SID | |
1131 | * | |
1132 | * Obtains a SID associated with the security context that | |
1133 | * has the string representation specified by @scontext. | |
1134 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
1135 | * memory is available, or 0 on success. | |
1136 | */ | |
8f0cfa52 | 1137 | int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid) |
f5c1d5b2 JM |
1138 | { |
1139 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 | 1140 | sid, SECSID_NULL, GFP_KERNEL, 0); |
f5c1d5b2 JM |
1141 | } |
1142 | ||
1143 | /** | |
1144 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
1145 | * falling back to specified default if needed. | |
1146 | * | |
1147 | * @scontext: security context | |
1148 | * @scontext_len: length in bytes | |
1149 | * @sid: security identifier, SID | |
d133a960 | 1150 | * @def_sid: default SID to assign on error |
f5c1d5b2 JM |
1151 | * |
1152 | * Obtains a SID associated with the security context that | |
1153 | * has the string representation specified by @scontext. | |
1154 | * The default SID is passed to the MLS layer to be used to allow | |
1155 | * kernel labeling of the MLS field if the MLS field is not present | |
1156 | * (for upgrading to MLS without full relabel). | |
12b29f34 | 1157 | * Implicitly forces adding of the context even if it cannot be mapped yet. |
f5c1d5b2 JM |
1158 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient |
1159 | * memory is available, or 0 on success. | |
1160 | */ | |
7bf570dc DH |
1161 | int security_context_to_sid_default(const char *scontext, u32 scontext_len, |
1162 | u32 *sid, u32 def_sid, gfp_t gfp_flags) | |
f5c1d5b2 JM |
1163 | { |
1164 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 SS |
1165 | sid, def_sid, gfp_flags, 1); |
1166 | } | |
1167 | ||
1168 | int security_context_to_sid_force(const char *scontext, u32 scontext_len, | |
1169 | u32 *sid) | |
1170 | { | |
1171 | return security_context_to_sid_core(scontext, scontext_len, | |
1172 | sid, SECSID_NULL, GFP_KERNEL, 1); | |
f5c1d5b2 JM |
1173 | } |
1174 | ||
1da177e4 LT |
1175 | static int compute_sid_handle_invalid_context( |
1176 | struct context *scontext, | |
1177 | struct context *tcontext, | |
1178 | u16 tclass, | |
1179 | struct context *newcontext) | |
1180 | { | |
1181 | char *s = NULL, *t = NULL, *n = NULL; | |
1182 | u32 slen, tlen, nlen; | |
1183 | ||
1184 | if (context_struct_to_string(scontext, &s, &slen) < 0) | |
1185 | goto out; | |
1186 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
1187 | goto out; | |
1188 | if (context_struct_to_string(newcontext, &n, &nlen) < 0) | |
1189 | goto out; | |
9ad9ad38 | 1190 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
1191 | "security_compute_sid: invalid context %s" |
1192 | " for scontext=%s" | |
1193 | " tcontext=%s" | |
1194 | " tclass=%s", | |
1195 | n, s, t, policydb.p_class_val_to_name[tclass-1]); | |
1196 | out: | |
1197 | kfree(s); | |
1198 | kfree(t); | |
1199 | kfree(n); | |
1200 | if (!selinux_enforcing) | |
1201 | return 0; | |
1202 | return -EACCES; | |
1203 | } | |
1204 | ||
1205 | static int security_compute_sid(u32 ssid, | |
1206 | u32 tsid, | |
1207 | u16 tclass, | |
1208 | u32 specified, | |
1209 | u32 *out_sid) | |
1210 | { | |
1211 | struct context *scontext = NULL, *tcontext = NULL, newcontext; | |
1212 | struct role_trans *roletr = NULL; | |
1213 | struct avtab_key avkey; | |
1214 | struct avtab_datum *avdatum; | |
1215 | struct avtab_node *node; | |
1da177e4 LT |
1216 | int rc = 0; |
1217 | ||
1218 | if (!ss_initialized) { | |
1219 | switch (tclass) { | |
1220 | case SECCLASS_PROCESS: | |
1221 | *out_sid = ssid; | |
1222 | break; | |
1223 | default: | |
1224 | *out_sid = tsid; | |
1225 | break; | |
1226 | } | |
1227 | goto out; | |
1228 | } | |
1229 | ||
851f8a69 VY |
1230 | context_init(&newcontext); |
1231 | ||
0804d113 | 1232 | read_lock(&policy_rwlock); |
1da177e4 LT |
1233 | |
1234 | scontext = sidtab_search(&sidtab, ssid); | |
1235 | if (!scontext) { | |
744ba35e EP |
1236 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1237 | __func__, ssid); | |
1da177e4 LT |
1238 | rc = -EINVAL; |
1239 | goto out_unlock; | |
1240 | } | |
1241 | tcontext = sidtab_search(&sidtab, tsid); | |
1242 | if (!tcontext) { | |
744ba35e EP |
1243 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1244 | __func__, tsid); | |
1da177e4 LT |
1245 | rc = -EINVAL; |
1246 | goto out_unlock; | |
1247 | } | |
1248 | ||
1da177e4 LT |
1249 | /* Set the user identity. */ |
1250 | switch (specified) { | |
1251 | case AVTAB_TRANSITION: | |
1252 | case AVTAB_CHANGE: | |
1253 | /* Use the process user identity. */ | |
1254 | newcontext.user = scontext->user; | |
1255 | break; | |
1256 | case AVTAB_MEMBER: | |
1257 | /* Use the related object owner. */ | |
1258 | newcontext.user = tcontext->user; | |
1259 | break; | |
1260 | } | |
1261 | ||
1262 | /* Set the role and type to default values. */ | |
1263 | switch (tclass) { | |
1264 | case SECCLASS_PROCESS: | |
1265 | /* Use the current role and type of process. */ | |
1266 | newcontext.role = scontext->role; | |
1267 | newcontext.type = scontext->type; | |
1268 | break; | |
1269 | default: | |
1270 | /* Use the well-defined object role. */ | |
1271 | newcontext.role = OBJECT_R_VAL; | |
1272 | /* Use the type of the related object. */ | |
1273 | newcontext.type = tcontext->type; | |
1274 | } | |
1275 | ||
1276 | /* Look for a type transition/member/change rule. */ | |
1277 | avkey.source_type = scontext->type; | |
1278 | avkey.target_type = tcontext->type; | |
1279 | avkey.target_class = tclass; | |
782ebb99 SS |
1280 | avkey.specified = specified; |
1281 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
1282 | |
1283 | /* If no permanent rule, also check for enabled conditional rules */ | |
5d55a345 | 1284 | if (!avdatum) { |
782ebb99 | 1285 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
dbc74c65 | 1286 | for (; node; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 1287 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
1288 | avdatum = &node->datum; |
1289 | break; | |
1290 | } | |
1291 | } | |
1292 | } | |
1293 | ||
782ebb99 | 1294 | if (avdatum) { |
1da177e4 | 1295 | /* Use the type from the type transition/member/change rule. */ |
782ebb99 | 1296 | newcontext.type = avdatum->data; |
1da177e4 LT |
1297 | } |
1298 | ||
1299 | /* Check for class-specific changes. */ | |
1300 | switch (tclass) { | |
1301 | case SECCLASS_PROCESS: | |
1302 | if (specified & AVTAB_TRANSITION) { | |
1303 | /* Look for a role transition rule. */ | |
1304 | for (roletr = policydb.role_tr; roletr; | |
1305 | roletr = roletr->next) { | |
1306 | if (roletr->role == scontext->role && | |
1307 | roletr->type == tcontext->type) { | |
1308 | /* Use the role transition rule. */ | |
1309 | newcontext.role = roletr->new_role; | |
1310 | break; | |
1311 | } | |
1312 | } | |
1313 | } | |
1314 | break; | |
1315 | default: | |
1316 | break; | |
1317 | } | |
1318 | ||
1319 | /* Set the MLS attributes. | |
1320 | This is done last because it may allocate memory. */ | |
1321 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext); | |
1322 | if (rc) | |
1323 | goto out_unlock; | |
1324 | ||
1325 | /* Check the validity of the context. */ | |
1326 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
1327 | rc = compute_sid_handle_invalid_context(scontext, | |
1328 | tcontext, | |
1329 | tclass, | |
1330 | &newcontext); | |
1331 | if (rc) | |
1332 | goto out_unlock; | |
1333 | } | |
1334 | /* Obtain the sid for the context. */ | |
1335 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
1336 | out_unlock: | |
0804d113 | 1337 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1338 | context_destroy(&newcontext); |
1339 | out: | |
1340 | return rc; | |
1341 | } | |
1342 | ||
1343 | /** | |
1344 | * security_transition_sid - Compute the SID for a new subject/object. | |
1345 | * @ssid: source security identifier | |
1346 | * @tsid: target security identifier | |
1347 | * @tclass: target security class | |
1348 | * @out_sid: security identifier for new subject/object | |
1349 | * | |
1350 | * Compute a SID to use for labeling a new subject or object in the | |
1351 | * class @tclass based on a SID pair (@ssid, @tsid). | |
1352 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1353 | * if insufficient memory is available, or %0 if the new SID was | |
1354 | * computed successfully. | |
1355 | */ | |
1356 | int security_transition_sid(u32 ssid, | |
1357 | u32 tsid, | |
1358 | u16 tclass, | |
1359 | u32 *out_sid) | |
1360 | { | |
1361 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid); | |
1362 | } | |
1363 | ||
1364 | /** | |
1365 | * security_member_sid - Compute the SID for member selection. | |
1366 | * @ssid: source security identifier | |
1367 | * @tsid: target security identifier | |
1368 | * @tclass: target security class | |
1369 | * @out_sid: security identifier for selected member | |
1370 | * | |
1371 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1372 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1373 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1374 | * if insufficient memory is available, or %0 if the SID was | |
1375 | * computed successfully. | |
1376 | */ | |
1377 | int security_member_sid(u32 ssid, | |
1378 | u32 tsid, | |
1379 | u16 tclass, | |
1380 | u32 *out_sid) | |
1381 | { | |
1382 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid); | |
1383 | } | |
1384 | ||
1385 | /** | |
1386 | * security_change_sid - Compute the SID for object relabeling. | |
1387 | * @ssid: source security identifier | |
1388 | * @tsid: target security identifier | |
1389 | * @tclass: target security class | |
1390 | * @out_sid: security identifier for selected member | |
1391 | * | |
1392 | * Compute a SID to use for relabeling an object of class @tclass | |
1393 | * based on a SID pair (@ssid, @tsid). | |
1394 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1395 | * if insufficient memory is available, or %0 if the SID was | |
1396 | * computed successfully. | |
1397 | */ | |
1398 | int security_change_sid(u32 ssid, | |
1399 | u32 tsid, | |
1400 | u16 tclass, | |
1401 | u32 *out_sid) | |
1402 | { | |
1403 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid); | |
1404 | } | |
1405 | ||
b94c7e67 CS |
1406 | /* |
1407 | * Verify that each kernel class that is defined in the | |
1408 | * policy is correct | |
1409 | */ | |
1410 | static int validate_classes(struct policydb *p) | |
1411 | { | |
1412 | int i, j; | |
1413 | struct class_datum *cladatum; | |
1414 | struct perm_datum *perdatum; | |
1415 | u32 nprim, tmp, common_pts_len, perm_val, pol_val; | |
1416 | u16 class_val; | |
1417 | const struct selinux_class_perm *kdefs = &selinux_class_perm; | |
1418 | const char *def_class, *def_perm, *pol_class; | |
1419 | struct symtab *perms; | |
6cbe2706 | 1420 | bool print_unknown_handle = 0; |
b94c7e67 | 1421 | |
3f12070e EP |
1422 | if (p->allow_unknown) { |
1423 | u32 num_classes = kdefs->cts_len; | |
1424 | p->undefined_perms = kcalloc(num_classes, sizeof(u32), GFP_KERNEL); | |
1425 | if (!p->undefined_perms) | |
1426 | return -ENOMEM; | |
1427 | } | |
1428 | ||
b94c7e67 CS |
1429 | for (i = 1; i < kdefs->cts_len; i++) { |
1430 | def_class = kdefs->class_to_string[i]; | |
a764ae4b SS |
1431 | if (!def_class) |
1432 | continue; | |
b94c7e67 CS |
1433 | if (i > p->p_classes.nprim) { |
1434 | printk(KERN_INFO | |
454d972c | 1435 | "SELinux: class %s not defined in policy\n", |
b94c7e67 | 1436 | def_class); |
3f12070e EP |
1437 | if (p->reject_unknown) |
1438 | return -EINVAL; | |
1439 | if (p->allow_unknown) | |
1440 | p->undefined_perms[i-1] = ~0U; | |
6cbe2706 | 1441 | print_unknown_handle = 1; |
b94c7e67 CS |
1442 | continue; |
1443 | } | |
1444 | pol_class = p->p_class_val_to_name[i-1]; | |
1445 | if (strcmp(pol_class, def_class)) { | |
1446 | printk(KERN_ERR | |
454d972c | 1447 | "SELinux: class %d is incorrect, found %s but should be %s\n", |
b94c7e67 CS |
1448 | i, pol_class, def_class); |
1449 | return -EINVAL; | |
1450 | } | |
1451 | } | |
1452 | for (i = 0; i < kdefs->av_pts_len; i++) { | |
1453 | class_val = kdefs->av_perm_to_string[i].tclass; | |
1454 | perm_val = kdefs->av_perm_to_string[i].value; | |
1455 | def_perm = kdefs->av_perm_to_string[i].name; | |
1456 | if (class_val > p->p_classes.nprim) | |
1457 | continue; | |
1458 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1459 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1460 | BUG_ON(!cladatum); | |
1461 | perms = &cladatum->permissions; | |
1462 | nprim = 1 << (perms->nprim - 1); | |
1463 | if (perm_val > nprim) { | |
1464 | printk(KERN_INFO | |
454d972c | 1465 | "SELinux: permission %s in class %s not defined in policy\n", |
b94c7e67 | 1466 | def_perm, pol_class); |
3f12070e EP |
1467 | if (p->reject_unknown) |
1468 | return -EINVAL; | |
1469 | if (p->allow_unknown) | |
1470 | p->undefined_perms[class_val-1] |= perm_val; | |
6cbe2706 | 1471 | print_unknown_handle = 1; |
b94c7e67 CS |
1472 | continue; |
1473 | } | |
1474 | perdatum = hashtab_search(perms->table, def_perm); | |
1475 | if (perdatum == NULL) { | |
1476 | printk(KERN_ERR | |
454d972c | 1477 | "SELinux: permission %s in class %s not found in policy, bad policy\n", |
b94c7e67 CS |
1478 | def_perm, pol_class); |
1479 | return -EINVAL; | |
1480 | } | |
1481 | pol_val = 1 << (perdatum->value - 1); | |
1482 | if (pol_val != perm_val) { | |
1483 | printk(KERN_ERR | |
454d972c | 1484 | "SELinux: permission %s in class %s has incorrect value\n", |
b94c7e67 CS |
1485 | def_perm, pol_class); |
1486 | return -EINVAL; | |
1487 | } | |
1488 | } | |
1489 | for (i = 0; i < kdefs->av_inherit_len; i++) { | |
1490 | class_val = kdefs->av_inherit[i].tclass; | |
1491 | if (class_val > p->p_classes.nprim) | |
1492 | continue; | |
1493 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1494 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1495 | BUG_ON(!cladatum); | |
1496 | if (!cladatum->comdatum) { | |
1497 | printk(KERN_ERR | |
454d972c | 1498 | "SELinux: class %s should have an inherits clause but does not\n", |
b94c7e67 CS |
1499 | pol_class); |
1500 | return -EINVAL; | |
1501 | } | |
1502 | tmp = kdefs->av_inherit[i].common_base; | |
1503 | common_pts_len = 0; | |
1504 | while (!(tmp & 0x01)) { | |
1505 | common_pts_len++; | |
1506 | tmp >>= 1; | |
1507 | } | |
1508 | perms = &cladatum->comdatum->permissions; | |
1509 | for (j = 0; j < common_pts_len; j++) { | |
1510 | def_perm = kdefs->av_inherit[i].common_pts[j]; | |
1511 | if (j >= perms->nprim) { | |
1512 | printk(KERN_INFO | |
454d972c | 1513 | "SELinux: permission %s in class %s not defined in policy\n", |
b94c7e67 | 1514 | def_perm, pol_class); |
3f12070e EP |
1515 | if (p->reject_unknown) |
1516 | return -EINVAL; | |
1517 | if (p->allow_unknown) | |
1518 | p->undefined_perms[class_val-1] |= (1 << j); | |
6cbe2706 | 1519 | print_unknown_handle = 1; |
b94c7e67 CS |
1520 | continue; |
1521 | } | |
1522 | perdatum = hashtab_search(perms->table, def_perm); | |
1523 | if (perdatum == NULL) { | |
1524 | printk(KERN_ERR | |
454d972c | 1525 | "SELinux: permission %s in class %s not found in policy, bad policy\n", |
b94c7e67 CS |
1526 | def_perm, pol_class); |
1527 | return -EINVAL; | |
1528 | } | |
1529 | if (perdatum->value != j + 1) { | |
1530 | printk(KERN_ERR | |
454d972c | 1531 | "SELinux: permission %s in class %s has incorrect value\n", |
b94c7e67 CS |
1532 | def_perm, pol_class); |
1533 | return -EINVAL; | |
1534 | } | |
1535 | } | |
1536 | } | |
6cbe2706 EP |
1537 | if (print_unknown_handle) |
1538 | printk(KERN_INFO "SELinux: the above unknown classes and permissions will be %s\n", | |
1539 | (security_get_allow_unknown() ? "allowed" : "denied")); | |
b94c7e67 CS |
1540 | return 0; |
1541 | } | |
1542 | ||
1da177e4 LT |
1543 | /* Clone the SID into the new SID table. */ |
1544 | static int clone_sid(u32 sid, | |
1545 | struct context *context, | |
1546 | void *arg) | |
1547 | { | |
1548 | struct sidtab *s = arg; | |
1549 | ||
1550 | return sidtab_insert(s, sid, context); | |
1551 | } | |
1552 | ||
1553 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1554 | { | |
1555 | int rc = 0; | |
1556 | ||
1557 | if (selinux_enforcing) { | |
1558 | rc = -EINVAL; | |
1559 | } else { | |
1560 | char *s; | |
1561 | u32 len; | |
1562 | ||
12b29f34 SS |
1563 | if (!context_struct_to_string(context, &s, &len)) { |
1564 | printk(KERN_WARNING | |
1565 | "SELinux: Context %s would be invalid if enforcing\n", | |
1566 | s); | |
1567 | kfree(s); | |
1568 | } | |
1da177e4 LT |
1569 | } |
1570 | return rc; | |
1571 | } | |
1572 | ||
1573 | struct convert_context_args { | |
1574 | struct policydb *oldp; | |
1575 | struct policydb *newp; | |
1576 | }; | |
1577 | ||
1578 | /* | |
1579 | * Convert the values in the security context | |
1580 | * structure `c' from the values specified | |
1581 | * in the policy `p->oldp' to the values specified | |
1582 | * in the policy `p->newp'. Verify that the | |
1583 | * context is valid under the new policy. | |
1584 | */ | |
1585 | static int convert_context(u32 key, | |
1586 | struct context *c, | |
1587 | void *p) | |
1588 | { | |
1589 | struct convert_context_args *args; | |
1590 | struct context oldc; | |
1591 | struct role_datum *role; | |
1592 | struct type_datum *typdatum; | |
1593 | struct user_datum *usrdatum; | |
1594 | char *s; | |
1595 | u32 len; | |
1596 | int rc; | |
1597 | ||
1598 | args = p; | |
1599 | ||
12b29f34 SS |
1600 | if (c->str) { |
1601 | struct context ctx; | |
9a59daa0 SS |
1602 | s = kstrdup(c->str, GFP_KERNEL); |
1603 | if (!s) { | |
1604 | rc = -ENOMEM; | |
1605 | goto out; | |
1606 | } | |
1607 | rc = string_to_context_struct(args->newp, NULL, s, | |
1608 | c->len, &ctx, SECSID_NULL); | |
1609 | kfree(s); | |
12b29f34 SS |
1610 | if (!rc) { |
1611 | printk(KERN_INFO | |
1612 | "SELinux: Context %s became valid (mapped).\n", | |
1613 | c->str); | |
1614 | /* Replace string with mapped representation. */ | |
1615 | kfree(c->str); | |
1616 | memcpy(c, &ctx, sizeof(*c)); | |
1617 | goto out; | |
1618 | } else if (rc == -EINVAL) { | |
1619 | /* Retain string representation for later mapping. */ | |
1620 | rc = 0; | |
1621 | goto out; | |
1622 | } else { | |
1623 | /* Other error condition, e.g. ENOMEM. */ | |
1624 | printk(KERN_ERR | |
1625 | "SELinux: Unable to map context %s, rc = %d.\n", | |
1626 | c->str, -rc); | |
1627 | goto out; | |
1628 | } | |
1629 | } | |
1630 | ||
1da177e4 LT |
1631 | rc = context_cpy(&oldc, c); |
1632 | if (rc) | |
1633 | goto out; | |
1634 | ||
1635 | rc = -EINVAL; | |
1636 | ||
1637 | /* Convert the user. */ | |
1638 | usrdatum = hashtab_search(args->newp->p_users.table, | |
5d55a345 EP |
1639 | args->oldp->p_user_val_to_name[c->user - 1]); |
1640 | if (!usrdatum) | |
1da177e4 | 1641 | goto bad; |
1da177e4 LT |
1642 | c->user = usrdatum->value; |
1643 | ||
1644 | /* Convert the role. */ | |
1645 | role = hashtab_search(args->newp->p_roles.table, | |
5d55a345 EP |
1646 | args->oldp->p_role_val_to_name[c->role - 1]); |
1647 | if (!role) | |
1da177e4 | 1648 | goto bad; |
1da177e4 LT |
1649 | c->role = role->value; |
1650 | ||
1651 | /* Convert the type. */ | |
1652 | typdatum = hashtab_search(args->newp->p_types.table, | |
5d55a345 EP |
1653 | args->oldp->p_type_val_to_name[c->type - 1]); |
1654 | if (!typdatum) | |
1da177e4 | 1655 | goto bad; |
1da177e4 LT |
1656 | c->type = typdatum->value; |
1657 | ||
1658 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1659 | if (rc) | |
1660 | goto bad; | |
1661 | ||
1662 | /* Check the validity of the new context. */ | |
1663 | if (!policydb_context_isvalid(args->newp, c)) { | |
1664 | rc = convert_context_handle_invalid_context(&oldc); | |
1665 | if (rc) | |
1666 | goto bad; | |
1667 | } | |
1668 | ||
1669 | context_destroy(&oldc); | |
12b29f34 | 1670 | rc = 0; |
1da177e4 LT |
1671 | out: |
1672 | return rc; | |
1673 | bad: | |
12b29f34 SS |
1674 | /* Map old representation to string and save it. */ |
1675 | if (context_struct_to_string(&oldc, &s, &len)) | |
1676 | return -ENOMEM; | |
1da177e4 | 1677 | context_destroy(&oldc); |
12b29f34 SS |
1678 | context_destroy(c); |
1679 | c->str = s; | |
1680 | c->len = len; | |
1681 | printk(KERN_INFO | |
1682 | "SELinux: Context %s became invalid (unmapped).\n", | |
1683 | c->str); | |
1684 | rc = 0; | |
1da177e4 LT |
1685 | goto out; |
1686 | } | |
1687 | ||
3bb56b25 PM |
1688 | static void security_load_policycaps(void) |
1689 | { | |
1690 | selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps, | |
1691 | POLICYDB_CAPABILITY_NETPEER); | |
b0c636b9 EP |
1692 | selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps, |
1693 | POLICYDB_CAPABILITY_OPENPERM); | |
3bb56b25 PM |
1694 | } |
1695 | ||
1da177e4 | 1696 | extern void selinux_complete_init(void); |
e900a7d9 | 1697 | static int security_preserve_bools(struct policydb *p); |
1da177e4 LT |
1698 | |
1699 | /** | |
1700 | * security_load_policy - Load a security policy configuration. | |
1701 | * @data: binary policy data | |
1702 | * @len: length of data in bytes | |
1703 | * | |
1704 | * Load a new set of security policy configuration data, | |
1705 | * validate it and convert the SID table as necessary. | |
1706 | * This function will flush the access vector cache after | |
1707 | * loading the new policy. | |
1708 | */ | |
1709 | int security_load_policy(void *data, size_t len) | |
1710 | { | |
1711 | struct policydb oldpolicydb, newpolicydb; | |
1712 | struct sidtab oldsidtab, newsidtab; | |
1713 | struct convert_context_args args; | |
1714 | u32 seqno; | |
1715 | int rc = 0; | |
1716 | struct policy_file file = { data, len }, *fp = &file; | |
1717 | ||
1da177e4 LT |
1718 | if (!ss_initialized) { |
1719 | avtab_cache_init(); | |
1720 | if (policydb_read(&policydb, fp)) { | |
1da177e4 LT |
1721 | avtab_cache_destroy(); |
1722 | return -EINVAL; | |
1723 | } | |
1724 | if (policydb_load_isids(&policydb, &sidtab)) { | |
1da177e4 LT |
1725 | policydb_destroy(&policydb); |
1726 | avtab_cache_destroy(); | |
1727 | return -EINVAL; | |
1728 | } | |
b94c7e67 CS |
1729 | /* Verify that the kernel defined classes are correct. */ |
1730 | if (validate_classes(&policydb)) { | |
1731 | printk(KERN_ERR | |
454d972c | 1732 | "SELinux: the definition of a class is incorrect\n"); |
b94c7e67 CS |
1733 | sidtab_destroy(&sidtab); |
1734 | policydb_destroy(&policydb); | |
1735 | avtab_cache_destroy(); | |
1736 | return -EINVAL; | |
1737 | } | |
3bb56b25 | 1738 | security_load_policycaps(); |
1da177e4 LT |
1739 | policydb_loaded_version = policydb.policyvers; |
1740 | ss_initialized = 1; | |
4c443d1b | 1741 | seqno = ++latest_granting; |
1da177e4 | 1742 | selinux_complete_init(); |
4c443d1b SS |
1743 | avc_ss_reset(seqno); |
1744 | selnl_notify_policyload(seqno); | |
7420ed23 | 1745 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1746 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1747 | return 0; |
1748 | } | |
1749 | ||
1750 | #if 0 | |
1751 | sidtab_hash_eval(&sidtab, "sids"); | |
1752 | #endif | |
1753 | ||
89abd0ac | 1754 | if (policydb_read(&newpolicydb, fp)) |
1da177e4 | 1755 | return -EINVAL; |
1da177e4 | 1756 | |
12b29f34 | 1757 | if (sidtab_init(&newsidtab)) { |
12b29f34 SS |
1758 | policydb_destroy(&newpolicydb); |
1759 | return -ENOMEM; | |
1760 | } | |
1da177e4 | 1761 | |
b94c7e67 CS |
1762 | /* Verify that the kernel defined classes are correct. */ |
1763 | if (validate_classes(&newpolicydb)) { | |
1764 | printk(KERN_ERR | |
454d972c | 1765 | "SELinux: the definition of a class is incorrect\n"); |
b94c7e67 CS |
1766 | rc = -EINVAL; |
1767 | goto err; | |
1768 | } | |
1769 | ||
e900a7d9 SS |
1770 | rc = security_preserve_bools(&newpolicydb); |
1771 | if (rc) { | |
454d972c | 1772 | printk(KERN_ERR "SELinux: unable to preserve booleans\n"); |
e900a7d9 SS |
1773 | goto err; |
1774 | } | |
1775 | ||
1da177e4 LT |
1776 | /* Clone the SID table. */ |
1777 | sidtab_shutdown(&sidtab); | |
1778 | if (sidtab_map(&sidtab, clone_sid, &newsidtab)) { | |
1779 | rc = -ENOMEM; | |
1780 | goto err; | |
1781 | } | |
1782 | ||
12b29f34 SS |
1783 | /* |
1784 | * Convert the internal representations of contexts | |
1785 | * in the new SID table. | |
1786 | */ | |
1da177e4 LT |
1787 | args.oldp = &policydb; |
1788 | args.newp = &newpolicydb; | |
12b29f34 SS |
1789 | rc = sidtab_map(&newsidtab, convert_context, &args); |
1790 | if (rc) | |
1791 | goto err; | |
1da177e4 LT |
1792 | |
1793 | /* Save the old policydb and SID table to free later. */ | |
1794 | memcpy(&oldpolicydb, &policydb, sizeof policydb); | |
1795 | sidtab_set(&oldsidtab, &sidtab); | |
1796 | ||
1797 | /* Install the new policydb and SID table. */ | |
0804d113 | 1798 | write_lock_irq(&policy_rwlock); |
1da177e4 LT |
1799 | memcpy(&policydb, &newpolicydb, sizeof policydb); |
1800 | sidtab_set(&sidtab, &newsidtab); | |
3bb56b25 | 1801 | security_load_policycaps(); |
1da177e4 LT |
1802 | seqno = ++latest_granting; |
1803 | policydb_loaded_version = policydb.policyvers; | |
0804d113 | 1804 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
1805 | |
1806 | /* Free the old policydb and SID table. */ | |
1807 | policydb_destroy(&oldpolicydb); | |
1808 | sidtab_destroy(&oldsidtab); | |
1809 | ||
1810 | avc_ss_reset(seqno); | |
1811 | selnl_notify_policyload(seqno); | |
7420ed23 | 1812 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1813 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1814 | |
1815 | return 0; | |
1816 | ||
1817 | err: | |
1da177e4 LT |
1818 | sidtab_destroy(&newsidtab); |
1819 | policydb_destroy(&newpolicydb); | |
1820 | return rc; | |
1821 | ||
1822 | } | |
1823 | ||
1824 | /** | |
1825 | * security_port_sid - Obtain the SID for a port. | |
1da177e4 LT |
1826 | * @protocol: protocol number |
1827 | * @port: port number | |
1828 | * @out_sid: security identifier | |
1829 | */ | |
3e112172 | 1830 | int security_port_sid(u8 protocol, u16 port, u32 *out_sid) |
1da177e4 LT |
1831 | { |
1832 | struct ocontext *c; | |
1833 | int rc = 0; | |
1834 | ||
0804d113 | 1835 | read_lock(&policy_rwlock); |
1da177e4 LT |
1836 | |
1837 | c = policydb.ocontexts[OCON_PORT]; | |
1838 | while (c) { | |
1839 | if (c->u.port.protocol == protocol && | |
1840 | c->u.port.low_port <= port && | |
1841 | c->u.port.high_port >= port) | |
1842 | break; | |
1843 | c = c->next; | |
1844 | } | |
1845 | ||
1846 | if (c) { | |
1847 | if (!c->sid[0]) { | |
1848 | rc = sidtab_context_to_sid(&sidtab, | |
1849 | &c->context[0], | |
1850 | &c->sid[0]); | |
1851 | if (rc) | |
1852 | goto out; | |
1853 | } | |
1854 | *out_sid = c->sid[0]; | |
1855 | } else { | |
1856 | *out_sid = SECINITSID_PORT; | |
1857 | } | |
1858 | ||
1859 | out: | |
0804d113 | 1860 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1861 | return rc; |
1862 | } | |
1863 | ||
1864 | /** | |
1865 | * security_netif_sid - Obtain the SID for a network interface. | |
1866 | * @name: interface name | |
1867 | * @if_sid: interface SID | |
1da177e4 | 1868 | */ |
e8bfdb9d | 1869 | int security_netif_sid(char *name, u32 *if_sid) |
1da177e4 LT |
1870 | { |
1871 | int rc = 0; | |
1872 | struct ocontext *c; | |
1873 | ||
0804d113 | 1874 | read_lock(&policy_rwlock); |
1da177e4 LT |
1875 | |
1876 | c = policydb.ocontexts[OCON_NETIF]; | |
1877 | while (c) { | |
1878 | if (strcmp(name, c->u.name) == 0) | |
1879 | break; | |
1880 | c = c->next; | |
1881 | } | |
1882 | ||
1883 | if (c) { | |
1884 | if (!c->sid[0] || !c->sid[1]) { | |
1885 | rc = sidtab_context_to_sid(&sidtab, | |
1886 | &c->context[0], | |
1887 | &c->sid[0]); | |
1888 | if (rc) | |
1889 | goto out; | |
1890 | rc = sidtab_context_to_sid(&sidtab, | |
1891 | &c->context[1], | |
1892 | &c->sid[1]); | |
1893 | if (rc) | |
1894 | goto out; | |
1895 | } | |
1896 | *if_sid = c->sid[0]; | |
e8bfdb9d | 1897 | } else |
1da177e4 | 1898 | *if_sid = SECINITSID_NETIF; |
1da177e4 LT |
1899 | |
1900 | out: | |
0804d113 | 1901 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1902 | return rc; |
1903 | } | |
1904 | ||
1905 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
1906 | { | |
1907 | int i, fail = 0; | |
1908 | ||
5d55a345 EP |
1909 | for (i = 0; i < 4; i++) |
1910 | if (addr[i] != (input[i] & mask[i])) { | |
1da177e4 LT |
1911 | fail = 1; |
1912 | break; | |
1913 | } | |
1914 | ||
1915 | return !fail; | |
1916 | } | |
1917 | ||
1918 | /** | |
1919 | * security_node_sid - Obtain the SID for a node (host). | |
1920 | * @domain: communication domain aka address family | |
1921 | * @addrp: address | |
1922 | * @addrlen: address length in bytes | |
1923 | * @out_sid: security identifier | |
1924 | */ | |
1925 | int security_node_sid(u16 domain, | |
1926 | void *addrp, | |
1927 | u32 addrlen, | |
1928 | u32 *out_sid) | |
1929 | { | |
1930 | int rc = 0; | |
1931 | struct ocontext *c; | |
1932 | ||
0804d113 | 1933 | read_lock(&policy_rwlock); |
1da177e4 LT |
1934 | |
1935 | switch (domain) { | |
1936 | case AF_INET: { | |
1937 | u32 addr; | |
1938 | ||
1939 | if (addrlen != sizeof(u32)) { | |
1940 | rc = -EINVAL; | |
1941 | goto out; | |
1942 | } | |
1943 | ||
1944 | addr = *((u32 *)addrp); | |
1945 | ||
1946 | c = policydb.ocontexts[OCON_NODE]; | |
1947 | while (c) { | |
1948 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
1949 | break; | |
1950 | c = c->next; | |
1951 | } | |
1952 | break; | |
1953 | } | |
1954 | ||
1955 | case AF_INET6: | |
1956 | if (addrlen != sizeof(u64) * 2) { | |
1957 | rc = -EINVAL; | |
1958 | goto out; | |
1959 | } | |
1960 | c = policydb.ocontexts[OCON_NODE6]; | |
1961 | while (c) { | |
1962 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
1963 | c->u.node6.mask)) | |
1964 | break; | |
1965 | c = c->next; | |
1966 | } | |
1967 | break; | |
1968 | ||
1969 | default: | |
1970 | *out_sid = SECINITSID_NODE; | |
1971 | goto out; | |
1972 | } | |
1973 | ||
1974 | if (c) { | |
1975 | if (!c->sid[0]) { | |
1976 | rc = sidtab_context_to_sid(&sidtab, | |
1977 | &c->context[0], | |
1978 | &c->sid[0]); | |
1979 | if (rc) | |
1980 | goto out; | |
1981 | } | |
1982 | *out_sid = c->sid[0]; | |
1983 | } else { | |
1984 | *out_sid = SECINITSID_NODE; | |
1985 | } | |
1986 | ||
1987 | out: | |
0804d113 | 1988 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1989 | return rc; |
1990 | } | |
1991 | ||
1992 | #define SIDS_NEL 25 | |
1993 | ||
1994 | /** | |
1995 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
1996 | * @fromsid: starting SID | |
1997 | * @username: username | |
1998 | * @sids: array of reachable SIDs for user | |
1999 | * @nel: number of elements in @sids | |
2000 | * | |
2001 | * Generate the set of SIDs for legal security contexts | |
2002 | * for a given user that can be reached by @fromsid. | |
2003 | * Set *@sids to point to a dynamically allocated | |
2004 | * array containing the set of SIDs. Set *@nel to the | |
2005 | * number of elements in the array. | |
2006 | */ | |
2007 | ||
2008 | int security_get_user_sids(u32 fromsid, | |
5d55a345 | 2009 | char *username, |
1da177e4 LT |
2010 | u32 **sids, |
2011 | u32 *nel) | |
2012 | { | |
2013 | struct context *fromcon, usercon; | |
2c3c05db | 2014 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
2015 | u32 mynel = 0, maxnel = SIDS_NEL; |
2016 | struct user_datum *user; | |
2017 | struct role_datum *role; | |
782ebb99 | 2018 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
2019 | int rc = 0, i, j; |
2020 | ||
2c3c05db SS |
2021 | *sids = NULL; |
2022 | *nel = 0; | |
2023 | ||
2024 | if (!ss_initialized) | |
1da177e4 | 2025 | goto out; |
1da177e4 | 2026 | |
0804d113 | 2027 | read_lock(&policy_rwlock); |
1da177e4 | 2028 | |
12b29f34 SS |
2029 | context_init(&usercon); |
2030 | ||
1da177e4 LT |
2031 | fromcon = sidtab_search(&sidtab, fromsid); |
2032 | if (!fromcon) { | |
2033 | rc = -EINVAL; | |
2034 | goto out_unlock; | |
2035 | } | |
2036 | ||
2037 | user = hashtab_search(policydb.p_users.table, username); | |
2038 | if (!user) { | |
2039 | rc = -EINVAL; | |
2040 | goto out_unlock; | |
2041 | } | |
2042 | usercon.user = user->value; | |
2043 | ||
89d155ef | 2044 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
1da177e4 LT |
2045 | if (!mysids) { |
2046 | rc = -ENOMEM; | |
2047 | goto out_unlock; | |
2048 | } | |
1da177e4 | 2049 | |
9fe79ad1 | 2050 | ebitmap_for_each_positive_bit(&user->roles, rnode, i) { |
1da177e4 LT |
2051 | role = policydb.role_val_to_struct[i]; |
2052 | usercon.role = i+1; | |
9fe79ad1 | 2053 | ebitmap_for_each_positive_bit(&role->types, tnode, j) { |
1da177e4 LT |
2054 | usercon.type = j+1; |
2055 | ||
2056 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
2057 | continue; | |
2058 | ||
1da177e4 | 2059 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
2c3c05db | 2060 | if (rc) |
1da177e4 | 2061 | goto out_unlock; |
1da177e4 LT |
2062 | if (mynel < maxnel) { |
2063 | mysids[mynel++] = sid; | |
2064 | } else { | |
2065 | maxnel += SIDS_NEL; | |
89d155ef | 2066 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
1da177e4 LT |
2067 | if (!mysids2) { |
2068 | rc = -ENOMEM; | |
1da177e4 LT |
2069 | goto out_unlock; |
2070 | } | |
1da177e4 LT |
2071 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
2072 | kfree(mysids); | |
2073 | mysids = mysids2; | |
2074 | mysids[mynel++] = sid; | |
2075 | } | |
2076 | } | |
2077 | } | |
2078 | ||
1da177e4 | 2079 | out_unlock: |
0804d113 | 2080 | read_unlock(&policy_rwlock); |
2c3c05db SS |
2081 | if (rc || !mynel) { |
2082 | kfree(mysids); | |
2083 | goto out; | |
2084 | } | |
2085 | ||
2086 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); | |
2087 | if (!mysids2) { | |
2088 | rc = -ENOMEM; | |
2089 | kfree(mysids); | |
2090 | goto out; | |
2091 | } | |
2092 | for (i = 0, j = 0; i < mynel; i++) { | |
2093 | rc = avc_has_perm_noaudit(fromsid, mysids[i], | |
2094 | SECCLASS_PROCESS, | |
2095 | PROCESS__TRANSITION, AVC_STRICT, | |
2096 | NULL); | |
2097 | if (!rc) | |
2098 | mysids2[j++] = mysids[i]; | |
2099 | cond_resched(); | |
2100 | } | |
2101 | rc = 0; | |
2102 | kfree(mysids); | |
2103 | *sids = mysids2; | |
2104 | *nel = j; | |
1da177e4 LT |
2105 | out: |
2106 | return rc; | |
2107 | } | |
2108 | ||
2109 | /** | |
2110 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
2111 | * @fstype: filesystem type | |
2112 | * @path: path from root of mount | |
2113 | * @sclass: file security class | |
2114 | * @sid: SID for path | |
2115 | * | |
2116 | * Obtain a SID to use for a file in a filesystem that | |
2117 | * cannot support xattr or use a fixed labeling behavior like | |
2118 | * transition SIDs or task SIDs. | |
2119 | */ | |
2120 | int security_genfs_sid(const char *fstype, | |
5d55a345 | 2121 | char *path, |
1da177e4 LT |
2122 | u16 sclass, |
2123 | u32 *sid) | |
2124 | { | |
2125 | int len; | |
2126 | struct genfs *genfs; | |
2127 | struct ocontext *c; | |
2128 | int rc = 0, cmp = 0; | |
2129 | ||
b1aa5301 SS |
2130 | while (path[0] == '/' && path[1] == '/') |
2131 | path++; | |
2132 | ||
0804d113 | 2133 | read_lock(&policy_rwlock); |
1da177e4 LT |
2134 | |
2135 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { | |
2136 | cmp = strcmp(fstype, genfs->fstype); | |
2137 | if (cmp <= 0) | |
2138 | break; | |
2139 | } | |
2140 | ||
2141 | if (!genfs || cmp) { | |
2142 | *sid = SECINITSID_UNLABELED; | |
2143 | rc = -ENOENT; | |
2144 | goto out; | |
2145 | } | |
2146 | ||
2147 | for (c = genfs->head; c; c = c->next) { | |
2148 | len = strlen(c->u.name); | |
2149 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
2150 | (strncmp(c->u.name, path, len) == 0)) | |
2151 | break; | |
2152 | } | |
2153 | ||
2154 | if (!c) { | |
2155 | *sid = SECINITSID_UNLABELED; | |
2156 | rc = -ENOENT; | |
2157 | goto out; | |
2158 | } | |
2159 | ||
2160 | if (!c->sid[0]) { | |
2161 | rc = sidtab_context_to_sid(&sidtab, | |
2162 | &c->context[0], | |
2163 | &c->sid[0]); | |
2164 | if (rc) | |
2165 | goto out; | |
2166 | } | |
2167 | ||
2168 | *sid = c->sid[0]; | |
2169 | out: | |
0804d113 | 2170 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2171 | return rc; |
2172 | } | |
2173 | ||
2174 | /** | |
2175 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
2176 | * @fstype: filesystem type | |
2177 | * @behavior: labeling behavior | |
2178 | * @sid: SID for filesystem (superblock) | |
2179 | */ | |
2180 | int security_fs_use( | |
2181 | const char *fstype, | |
2182 | unsigned int *behavior, | |
089be43e | 2183 | u32 *sid) |
1da177e4 LT |
2184 | { |
2185 | int rc = 0; | |
2186 | struct ocontext *c; | |
2187 | ||
0804d113 | 2188 | read_lock(&policy_rwlock); |
1da177e4 LT |
2189 | |
2190 | c = policydb.ocontexts[OCON_FSUSE]; | |
2191 | while (c) { | |
2192 | if (strcmp(fstype, c->u.name) == 0) | |
2193 | break; | |
2194 | c = c->next; | |
2195 | } | |
2196 | ||
2197 | if (c) { | |
2198 | *behavior = c->v.behavior; | |
2199 | if (!c->sid[0]) { | |
2200 | rc = sidtab_context_to_sid(&sidtab, | |
2201 | &c->context[0], | |
2202 | &c->sid[0]); | |
2203 | if (rc) | |
2204 | goto out; | |
2205 | } | |
2206 | *sid = c->sid[0]; | |
2207 | } else { | |
089be43e JM |
2208 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); |
2209 | if (rc) { | |
2210 | *behavior = SECURITY_FS_USE_NONE; | |
2211 | rc = 0; | |
2212 | } else { | |
2213 | *behavior = SECURITY_FS_USE_GENFS; | |
2214 | } | |
1da177e4 LT |
2215 | } |
2216 | ||
2217 | out: | |
0804d113 | 2218 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2219 | return rc; |
2220 | } | |
2221 | ||
2222 | int security_get_bools(int *len, char ***names, int **values) | |
2223 | { | |
2224 | int i, rc = -ENOMEM; | |
2225 | ||
0804d113 | 2226 | read_lock(&policy_rwlock); |
1da177e4 LT |
2227 | *names = NULL; |
2228 | *values = NULL; | |
2229 | ||
2230 | *len = policydb.p_bools.nprim; | |
2231 | if (!*len) { | |
2232 | rc = 0; | |
2233 | goto out; | |
2234 | } | |
2235 | ||
5d55a345 | 2236 | *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); |
1da177e4 LT |
2237 | if (!*names) |
2238 | goto err; | |
1da177e4 | 2239 | |
e0795cf4 | 2240 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); |
1da177e4 LT |
2241 | if (!*values) |
2242 | goto err; | |
2243 | ||
2244 | for (i = 0; i < *len; i++) { | |
2245 | size_t name_len; | |
2246 | (*values)[i] = policydb.bool_val_to_struct[i]->state; | |
2247 | name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; | |
5d55a345 | 2248 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); |
1da177e4 LT |
2249 | if (!(*names)[i]) |
2250 | goto err; | |
2251 | strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); | |
2252 | (*names)[i][name_len - 1] = 0; | |
2253 | } | |
2254 | rc = 0; | |
2255 | out: | |
0804d113 | 2256 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2257 | return rc; |
2258 | err: | |
2259 | if (*names) { | |
2260 | for (i = 0; i < *len; i++) | |
9a5f04bf | 2261 | kfree((*names)[i]); |
1da177e4 | 2262 | } |
9a5f04bf | 2263 | kfree(*values); |
1da177e4 LT |
2264 | goto out; |
2265 | } | |
2266 | ||
2267 | ||
2268 | int security_set_bools(int len, int *values) | |
2269 | { | |
2270 | int i, rc = 0; | |
2271 | int lenp, seqno = 0; | |
2272 | struct cond_node *cur; | |
2273 | ||
0804d113 | 2274 | write_lock_irq(&policy_rwlock); |
1da177e4 LT |
2275 | |
2276 | lenp = policydb.p_bools.nprim; | |
2277 | if (len != lenp) { | |
2278 | rc = -EFAULT; | |
2279 | goto out; | |
2280 | } | |
2281 | ||
1da177e4 | 2282 | for (i = 0; i < len; i++) { |
af601e46 SG |
2283 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
2284 | audit_log(current->audit_context, GFP_ATOMIC, | |
2285 | AUDIT_MAC_CONFIG_CHANGE, | |
4746ec5b | 2286 | "bool=%s val=%d old_val=%d auid=%u ses=%u", |
af601e46 SG |
2287 | policydb.p_bool_val_to_name[i], |
2288 | !!values[i], | |
2289 | policydb.bool_val_to_struct[i]->state, | |
4746ec5b EP |
2290 | audit_get_loginuid(current), |
2291 | audit_get_sessionid(current)); | |
af601e46 | 2292 | } |
5d55a345 | 2293 | if (values[i]) |
1da177e4 | 2294 | policydb.bool_val_to_struct[i]->state = 1; |
5d55a345 | 2295 | else |
1da177e4 | 2296 | policydb.bool_val_to_struct[i]->state = 0; |
1da177e4 | 2297 | } |
1da177e4 | 2298 | |
dbc74c65 | 2299 | for (cur = policydb.cond_list; cur; cur = cur->next) { |
1da177e4 LT |
2300 | rc = evaluate_cond_node(&policydb, cur); |
2301 | if (rc) | |
2302 | goto out; | |
2303 | } | |
2304 | ||
2305 | seqno = ++latest_granting; | |
2306 | ||
2307 | out: | |
0804d113 | 2308 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
2309 | if (!rc) { |
2310 | avc_ss_reset(seqno); | |
2311 | selnl_notify_policyload(seqno); | |
342a0cff | 2312 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
2313 | } |
2314 | return rc; | |
2315 | } | |
2316 | ||
2317 | int security_get_bool_value(int bool) | |
2318 | { | |
2319 | int rc = 0; | |
2320 | int len; | |
2321 | ||
0804d113 | 2322 | read_lock(&policy_rwlock); |
1da177e4 LT |
2323 | |
2324 | len = policydb.p_bools.nprim; | |
2325 | if (bool >= len) { | |
2326 | rc = -EFAULT; | |
2327 | goto out; | |
2328 | } | |
2329 | ||
2330 | rc = policydb.bool_val_to_struct[bool]->state; | |
2331 | out: | |
0804d113 | 2332 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2333 | return rc; |
2334 | } | |
376bd9cb | 2335 | |
e900a7d9 SS |
2336 | static int security_preserve_bools(struct policydb *p) |
2337 | { | |
2338 | int rc, nbools = 0, *bvalues = NULL, i; | |
2339 | char **bnames = NULL; | |
2340 | struct cond_bool_datum *booldatum; | |
2341 | struct cond_node *cur; | |
2342 | ||
2343 | rc = security_get_bools(&nbools, &bnames, &bvalues); | |
2344 | if (rc) | |
2345 | goto out; | |
2346 | for (i = 0; i < nbools; i++) { | |
2347 | booldatum = hashtab_search(p->p_bools.table, bnames[i]); | |
2348 | if (booldatum) | |
2349 | booldatum->state = bvalues[i]; | |
2350 | } | |
dbc74c65 | 2351 | for (cur = p->cond_list; cur; cur = cur->next) { |
e900a7d9 SS |
2352 | rc = evaluate_cond_node(p, cur); |
2353 | if (rc) | |
2354 | goto out; | |
2355 | } | |
2356 | ||
2357 | out: | |
2358 | if (bnames) { | |
2359 | for (i = 0; i < nbools; i++) | |
2360 | kfree(bnames[i]); | |
2361 | } | |
2362 | kfree(bnames); | |
2363 | kfree(bvalues); | |
2364 | return rc; | |
2365 | } | |
2366 | ||
08554d6b VY |
2367 | /* |
2368 | * security_sid_mls_copy() - computes a new sid based on the given | |
2369 | * sid and the mls portion of mls_sid. | |
2370 | */ | |
2371 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
2372 | { | |
2373 | struct context *context1; | |
2374 | struct context *context2; | |
2375 | struct context newcon; | |
2376 | char *s; | |
2377 | u32 len; | |
2378 | int rc = 0; | |
2379 | ||
4eb327b5 | 2380 | if (!ss_initialized || !selinux_mls_enabled) { |
08554d6b VY |
2381 | *new_sid = sid; |
2382 | goto out; | |
2383 | } | |
2384 | ||
2385 | context_init(&newcon); | |
2386 | ||
0804d113 | 2387 | read_lock(&policy_rwlock); |
08554d6b VY |
2388 | context1 = sidtab_search(&sidtab, sid); |
2389 | if (!context1) { | |
744ba35e EP |
2390 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2391 | __func__, sid); | |
08554d6b VY |
2392 | rc = -EINVAL; |
2393 | goto out_unlock; | |
2394 | } | |
2395 | ||
2396 | context2 = sidtab_search(&sidtab, mls_sid); | |
2397 | if (!context2) { | |
744ba35e EP |
2398 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2399 | __func__, mls_sid); | |
08554d6b VY |
2400 | rc = -EINVAL; |
2401 | goto out_unlock; | |
2402 | } | |
2403 | ||
2404 | newcon.user = context1->user; | |
2405 | newcon.role = context1->role; | |
2406 | newcon.type = context1->type; | |
0efc61ea | 2407 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
2408 | if (rc) |
2409 | goto out_unlock; | |
2410 | ||
08554d6b VY |
2411 | /* Check the validity of the new context. */ |
2412 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
2413 | rc = convert_context_handle_invalid_context(&newcon); | |
2414 | if (rc) | |
2415 | goto bad; | |
2416 | } | |
2417 | ||
2418 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
2419 | goto out_unlock; | |
2420 | ||
2421 | bad: | |
2422 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
2423 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2424 | "security_sid_mls_copy: invalid context %s", s); | |
2425 | kfree(s); | |
2426 | } | |
2427 | ||
2428 | out_unlock: | |
0804d113 | 2429 | read_unlock(&policy_rwlock); |
08554d6b VY |
2430 | context_destroy(&newcon); |
2431 | out: | |
2432 | return rc; | |
2433 | } | |
2434 | ||
220deb96 PM |
2435 | /** |
2436 | * security_net_peersid_resolve - Compare and resolve two network peer SIDs | |
2437 | * @nlbl_sid: NetLabel SID | |
2438 | * @nlbl_type: NetLabel labeling protocol type | |
2439 | * @xfrm_sid: XFRM SID | |
2440 | * | |
2441 | * Description: | |
2442 | * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be | |
2443 | * resolved into a single SID it is returned via @peer_sid and the function | |
2444 | * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function | |
2445 | * returns a negative value. A table summarizing the behavior is below: | |
2446 | * | |
2447 | * | function return | @sid | |
2448 | * ------------------------------+-----------------+----------------- | |
2449 | * no peer labels | 0 | SECSID_NULL | |
2450 | * single peer label | 0 | <peer_label> | |
2451 | * multiple, consistent labels | 0 | <peer_label> | |
2452 | * multiple, inconsistent labels | -<errno> | SECSID_NULL | |
2453 | * | |
2454 | */ | |
2455 | int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, | |
2456 | u32 xfrm_sid, | |
2457 | u32 *peer_sid) | |
2458 | { | |
2459 | int rc; | |
2460 | struct context *nlbl_ctx; | |
2461 | struct context *xfrm_ctx; | |
2462 | ||
2463 | /* handle the common (which also happens to be the set of easy) cases | |
2464 | * right away, these two if statements catch everything involving a | |
2465 | * single or absent peer SID/label */ | |
2466 | if (xfrm_sid == SECSID_NULL) { | |
2467 | *peer_sid = nlbl_sid; | |
2468 | return 0; | |
2469 | } | |
2470 | /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label | |
2471 | * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label | |
2472 | * is present */ | |
2473 | if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { | |
2474 | *peer_sid = xfrm_sid; | |
2475 | return 0; | |
2476 | } | |
2477 | ||
2478 | /* we don't need to check ss_initialized here since the only way both | |
2479 | * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the | |
2480 | * security server was initialized and ss_initialized was true */ | |
2481 | if (!selinux_mls_enabled) { | |
2482 | *peer_sid = SECSID_NULL; | |
2483 | return 0; | |
2484 | } | |
2485 | ||
0804d113 | 2486 | read_lock(&policy_rwlock); |
220deb96 PM |
2487 | |
2488 | nlbl_ctx = sidtab_search(&sidtab, nlbl_sid); | |
2489 | if (!nlbl_ctx) { | |
744ba35e EP |
2490 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2491 | __func__, nlbl_sid); | |
220deb96 PM |
2492 | rc = -EINVAL; |
2493 | goto out_slowpath; | |
2494 | } | |
2495 | xfrm_ctx = sidtab_search(&sidtab, xfrm_sid); | |
2496 | if (!xfrm_ctx) { | |
744ba35e EP |
2497 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2498 | __func__, xfrm_sid); | |
220deb96 PM |
2499 | rc = -EINVAL; |
2500 | goto out_slowpath; | |
2501 | } | |
2502 | rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); | |
2503 | ||
2504 | out_slowpath: | |
0804d113 | 2505 | read_unlock(&policy_rwlock); |
220deb96 PM |
2506 | if (rc == 0) |
2507 | /* at present NetLabel SIDs/labels really only carry MLS | |
2508 | * information so if the MLS portion of the NetLabel SID | |
2509 | * matches the MLS portion of the labeled XFRM SID/label | |
2510 | * then pass along the XFRM SID as it is the most | |
2511 | * expressive */ | |
2512 | *peer_sid = xfrm_sid; | |
2513 | else | |
2514 | *peer_sid = SECSID_NULL; | |
2515 | return rc; | |
2516 | } | |
2517 | ||
55fcf09b CP |
2518 | static int get_classes_callback(void *k, void *d, void *args) |
2519 | { | |
2520 | struct class_datum *datum = d; | |
2521 | char *name = k, **classes = args; | |
2522 | int value = datum->value - 1; | |
2523 | ||
2524 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
2525 | if (!classes[value]) | |
2526 | return -ENOMEM; | |
2527 | ||
2528 | return 0; | |
2529 | } | |
2530 | ||
2531 | int security_get_classes(char ***classes, int *nclasses) | |
2532 | { | |
2533 | int rc = -ENOMEM; | |
2534 | ||
0804d113 | 2535 | read_lock(&policy_rwlock); |
55fcf09b CP |
2536 | |
2537 | *nclasses = policydb.p_classes.nprim; | |
2538 | *classes = kcalloc(*nclasses, sizeof(*classes), GFP_ATOMIC); | |
2539 | if (!*classes) | |
2540 | goto out; | |
2541 | ||
2542 | rc = hashtab_map(policydb.p_classes.table, get_classes_callback, | |
2543 | *classes); | |
2544 | if (rc < 0) { | |
2545 | int i; | |
2546 | for (i = 0; i < *nclasses; i++) | |
2547 | kfree((*classes)[i]); | |
2548 | kfree(*classes); | |
2549 | } | |
2550 | ||
2551 | out: | |
0804d113 | 2552 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2553 | return rc; |
2554 | } | |
2555 | ||
2556 | static int get_permissions_callback(void *k, void *d, void *args) | |
2557 | { | |
2558 | struct perm_datum *datum = d; | |
2559 | char *name = k, **perms = args; | |
2560 | int value = datum->value - 1; | |
2561 | ||
2562 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
2563 | if (!perms[value]) | |
2564 | return -ENOMEM; | |
2565 | ||
2566 | return 0; | |
2567 | } | |
2568 | ||
2569 | int security_get_permissions(char *class, char ***perms, int *nperms) | |
2570 | { | |
2571 | int rc = -ENOMEM, i; | |
2572 | struct class_datum *match; | |
2573 | ||
0804d113 | 2574 | read_lock(&policy_rwlock); |
55fcf09b CP |
2575 | |
2576 | match = hashtab_search(policydb.p_classes.table, class); | |
2577 | if (!match) { | |
744ba35e | 2578 | printk(KERN_ERR "SELinux: %s: unrecognized class %s\n", |
dd6f953a | 2579 | __func__, class); |
55fcf09b CP |
2580 | rc = -EINVAL; |
2581 | goto out; | |
2582 | } | |
2583 | ||
2584 | *nperms = match->permissions.nprim; | |
2585 | *perms = kcalloc(*nperms, sizeof(*perms), GFP_ATOMIC); | |
2586 | if (!*perms) | |
2587 | goto out; | |
2588 | ||
2589 | if (match->comdatum) { | |
2590 | rc = hashtab_map(match->comdatum->permissions.table, | |
2591 | get_permissions_callback, *perms); | |
2592 | if (rc < 0) | |
2593 | goto err; | |
2594 | } | |
2595 | ||
2596 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
2597 | *perms); | |
2598 | if (rc < 0) | |
2599 | goto err; | |
2600 | ||
2601 | out: | |
0804d113 | 2602 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2603 | return rc; |
2604 | ||
2605 | err: | |
0804d113 | 2606 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2607 | for (i = 0; i < *nperms; i++) |
2608 | kfree((*perms)[i]); | |
2609 | kfree(*perms); | |
2610 | return rc; | |
2611 | } | |
2612 | ||
3f12070e EP |
2613 | int security_get_reject_unknown(void) |
2614 | { | |
2615 | return policydb.reject_unknown; | |
2616 | } | |
2617 | ||
2618 | int security_get_allow_unknown(void) | |
2619 | { | |
2620 | return policydb.allow_unknown; | |
2621 | } | |
2622 | ||
3bb56b25 PM |
2623 | /** |
2624 | * security_policycap_supported - Check for a specific policy capability | |
2625 | * @req_cap: capability | |
2626 | * | |
2627 | * Description: | |
2628 | * This function queries the currently loaded policy to see if it supports the | |
2629 | * capability specified by @req_cap. Returns true (1) if the capability is | |
2630 | * supported, false (0) if it isn't supported. | |
2631 | * | |
2632 | */ | |
2633 | int security_policycap_supported(unsigned int req_cap) | |
2634 | { | |
2635 | int rc; | |
2636 | ||
0804d113 | 2637 | read_lock(&policy_rwlock); |
3bb56b25 | 2638 | rc = ebitmap_get_bit(&policydb.policycaps, req_cap); |
0804d113 | 2639 | read_unlock(&policy_rwlock); |
3bb56b25 PM |
2640 | |
2641 | return rc; | |
2642 | } | |
2643 | ||
376bd9cb DG |
2644 | struct selinux_audit_rule { |
2645 | u32 au_seqno; | |
2646 | struct context au_ctxt; | |
2647 | }; | |
2648 | ||
9d57a7f9 | 2649 | void selinux_audit_rule_free(void *vrule) |
376bd9cb | 2650 | { |
9d57a7f9 AD |
2651 | struct selinux_audit_rule *rule = vrule; |
2652 | ||
376bd9cb DG |
2653 | if (rule) { |
2654 | context_destroy(&rule->au_ctxt); | |
2655 | kfree(rule); | |
2656 | } | |
2657 | } | |
2658 | ||
9d57a7f9 | 2659 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) |
376bd9cb DG |
2660 | { |
2661 | struct selinux_audit_rule *tmprule; | |
2662 | struct role_datum *roledatum; | |
2663 | struct type_datum *typedatum; | |
2664 | struct user_datum *userdatum; | |
9d57a7f9 | 2665 | struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule; |
376bd9cb DG |
2666 | int rc = 0; |
2667 | ||
2668 | *rule = NULL; | |
2669 | ||
2670 | if (!ss_initialized) | |
3ad40d64 | 2671 | return -EOPNOTSUPP; |
376bd9cb DG |
2672 | |
2673 | switch (field) { | |
3a6b9f85 DG |
2674 | case AUDIT_SUBJ_USER: |
2675 | case AUDIT_SUBJ_ROLE: | |
2676 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
2677 | case AUDIT_OBJ_USER: |
2678 | case AUDIT_OBJ_ROLE: | |
2679 | case AUDIT_OBJ_TYPE: | |
376bd9cb | 2680 | /* only 'equals' and 'not equals' fit user, role, and type */ |
5af75d8d | 2681 | if (op != Audit_equal && op != Audit_not_equal) |
376bd9cb DG |
2682 | return -EINVAL; |
2683 | break; | |
3a6b9f85 DG |
2684 | case AUDIT_SUBJ_SEN: |
2685 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2686 | case AUDIT_OBJ_LEV_LOW: |
2687 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2688 | /* we do not allow a range, indicated by the presense of '-' */ |
2689 | if (strchr(rulestr, '-')) | |
2690 | return -EINVAL; | |
2691 | break; | |
2692 | default: | |
2693 | /* only the above fields are valid */ | |
2694 | return -EINVAL; | |
2695 | } | |
2696 | ||
2697 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
2698 | if (!tmprule) | |
2699 | return -ENOMEM; | |
2700 | ||
2701 | context_init(&tmprule->au_ctxt); | |
2702 | ||
0804d113 | 2703 | read_lock(&policy_rwlock); |
376bd9cb DG |
2704 | |
2705 | tmprule->au_seqno = latest_granting; | |
2706 | ||
2707 | switch (field) { | |
3a6b9f85 | 2708 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2709 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2710 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
2711 | if (!userdatum) | |
2712 | rc = -EINVAL; | |
2713 | else | |
2714 | tmprule->au_ctxt.user = userdatum->value; | |
2715 | break; | |
3a6b9f85 | 2716 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2717 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2718 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
2719 | if (!roledatum) | |
2720 | rc = -EINVAL; | |
2721 | else | |
2722 | tmprule->au_ctxt.role = roledatum->value; | |
2723 | break; | |
3a6b9f85 | 2724 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2725 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2726 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
2727 | if (!typedatum) | |
2728 | rc = -EINVAL; | |
2729 | else | |
2730 | tmprule->au_ctxt.type = typedatum->value; | |
2731 | break; | |
3a6b9f85 DG |
2732 | case AUDIT_SUBJ_SEN: |
2733 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2734 | case AUDIT_OBJ_LEV_LOW: |
2735 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2736 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
2737 | break; | |
2738 | } | |
2739 | ||
0804d113 | 2740 | read_unlock(&policy_rwlock); |
376bd9cb DG |
2741 | |
2742 | if (rc) { | |
2743 | selinux_audit_rule_free(tmprule); | |
2744 | tmprule = NULL; | |
2745 | } | |
2746 | ||
2747 | *rule = tmprule; | |
2748 | ||
2749 | return rc; | |
2750 | } | |
2751 | ||
9d57a7f9 AD |
2752 | /* Check to see if the rule contains any selinux fields */ |
2753 | int selinux_audit_rule_known(struct audit_krule *rule) | |
2754 | { | |
2755 | int i; | |
2756 | ||
2757 | for (i = 0; i < rule->field_count; i++) { | |
2758 | struct audit_field *f = &rule->fields[i]; | |
2759 | switch (f->type) { | |
2760 | case AUDIT_SUBJ_USER: | |
2761 | case AUDIT_SUBJ_ROLE: | |
2762 | case AUDIT_SUBJ_TYPE: | |
2763 | case AUDIT_SUBJ_SEN: | |
2764 | case AUDIT_SUBJ_CLR: | |
2765 | case AUDIT_OBJ_USER: | |
2766 | case AUDIT_OBJ_ROLE: | |
2767 | case AUDIT_OBJ_TYPE: | |
2768 | case AUDIT_OBJ_LEV_LOW: | |
2769 | case AUDIT_OBJ_LEV_HIGH: | |
2770 | return 1; | |
2771 | } | |
2772 | } | |
2773 | ||
2774 | return 0; | |
2775 | } | |
2776 | ||
2777 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, | |
f5269710 | 2778 | struct audit_context *actx) |
376bd9cb DG |
2779 | { |
2780 | struct context *ctxt; | |
2781 | struct mls_level *level; | |
9d57a7f9 | 2782 | struct selinux_audit_rule *rule = vrule; |
376bd9cb DG |
2783 | int match = 0; |
2784 | ||
2785 | if (!rule) { | |
2786 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2787 | "selinux_audit_rule_match: missing rule\n"); |
376bd9cb DG |
2788 | return -ENOENT; |
2789 | } | |
2790 | ||
0804d113 | 2791 | read_lock(&policy_rwlock); |
376bd9cb DG |
2792 | |
2793 | if (rule->au_seqno < latest_granting) { | |
2794 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2795 | "selinux_audit_rule_match: stale rule\n"); |
376bd9cb DG |
2796 | match = -ESTALE; |
2797 | goto out; | |
2798 | } | |
2799 | ||
9a2f44f0 | 2800 | ctxt = sidtab_search(&sidtab, sid); |
376bd9cb DG |
2801 | if (!ctxt) { |
2802 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 EP |
2803 | "selinux_audit_rule_match: unrecognized SID %d\n", |
2804 | sid); | |
376bd9cb DG |
2805 | match = -ENOENT; |
2806 | goto out; | |
2807 | } | |
2808 | ||
2809 | /* a field/op pair that is not caught here will simply fall through | |
2810 | without a match */ | |
2811 | switch (field) { | |
3a6b9f85 | 2812 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2813 | case AUDIT_OBJ_USER: |
376bd9cb | 2814 | switch (op) { |
5af75d8d | 2815 | case Audit_equal: |
376bd9cb DG |
2816 | match = (ctxt->user == rule->au_ctxt.user); |
2817 | break; | |
5af75d8d | 2818 | case Audit_not_equal: |
376bd9cb DG |
2819 | match = (ctxt->user != rule->au_ctxt.user); |
2820 | break; | |
2821 | } | |
2822 | break; | |
3a6b9f85 | 2823 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2824 | case AUDIT_OBJ_ROLE: |
376bd9cb | 2825 | switch (op) { |
5af75d8d | 2826 | case Audit_equal: |
376bd9cb DG |
2827 | match = (ctxt->role == rule->au_ctxt.role); |
2828 | break; | |
5af75d8d | 2829 | case Audit_not_equal: |
376bd9cb DG |
2830 | match = (ctxt->role != rule->au_ctxt.role); |
2831 | break; | |
2832 | } | |
2833 | break; | |
3a6b9f85 | 2834 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2835 | case AUDIT_OBJ_TYPE: |
376bd9cb | 2836 | switch (op) { |
5af75d8d | 2837 | case Audit_equal: |
376bd9cb DG |
2838 | match = (ctxt->type == rule->au_ctxt.type); |
2839 | break; | |
5af75d8d | 2840 | case Audit_not_equal: |
376bd9cb DG |
2841 | match = (ctxt->type != rule->au_ctxt.type); |
2842 | break; | |
2843 | } | |
2844 | break; | |
3a6b9f85 DG |
2845 | case AUDIT_SUBJ_SEN: |
2846 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2847 | case AUDIT_OBJ_LEV_LOW: |
2848 | case AUDIT_OBJ_LEV_HIGH: | |
2849 | level = ((field == AUDIT_SUBJ_SEN || | |
5d55a345 EP |
2850 | field == AUDIT_OBJ_LEV_LOW) ? |
2851 | &ctxt->range.level[0] : &ctxt->range.level[1]); | |
376bd9cb | 2852 | switch (op) { |
5af75d8d | 2853 | case Audit_equal: |
376bd9cb | 2854 | match = mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 2855 | level); |
376bd9cb | 2856 | break; |
5af75d8d | 2857 | case Audit_not_equal: |
376bd9cb | 2858 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 2859 | level); |
376bd9cb | 2860 | break; |
5af75d8d | 2861 | case Audit_lt: |
376bd9cb | 2862 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 EP |
2863 | level) && |
2864 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2865 | level)); | |
376bd9cb | 2866 | break; |
5af75d8d | 2867 | case Audit_le: |
376bd9cb | 2868 | match = mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 | 2869 | level); |
376bd9cb | 2870 | break; |
5af75d8d | 2871 | case Audit_gt: |
376bd9cb | 2872 | match = (mls_level_dom(level, |
5d55a345 EP |
2873 | &rule->au_ctxt.range.level[0]) && |
2874 | !mls_level_eq(level, | |
2875 | &rule->au_ctxt.range.level[0])); | |
376bd9cb | 2876 | break; |
5af75d8d | 2877 | case Audit_ge: |
376bd9cb | 2878 | match = mls_level_dom(level, |
5d55a345 | 2879 | &rule->au_ctxt.range.level[0]); |
376bd9cb DG |
2880 | break; |
2881 | } | |
2882 | } | |
2883 | ||
2884 | out: | |
0804d113 | 2885 | read_unlock(&policy_rwlock); |
376bd9cb DG |
2886 | return match; |
2887 | } | |
2888 | ||
9d57a7f9 | 2889 | static int (*aurule_callback)(void) = audit_update_lsm_rules; |
376bd9cb DG |
2890 | |
2891 | static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid, | |
f5269710 | 2892 | u16 class, u32 perms, u32 *retained) |
376bd9cb DG |
2893 | { |
2894 | int err = 0; | |
2895 | ||
2896 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
2897 | err = aurule_callback(); | |
2898 | return err; | |
2899 | } | |
2900 | ||
2901 | static int __init aurule_init(void) | |
2902 | { | |
2903 | int err; | |
2904 | ||
2905 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET, | |
5d55a345 | 2906 | SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0); |
376bd9cb DG |
2907 | if (err) |
2908 | panic("avc_add_callback() failed, error %d\n", err); | |
2909 | ||
2910 | return err; | |
2911 | } | |
2912 | __initcall(aurule_init); | |
2913 | ||
7420ed23 | 2914 | #ifdef CONFIG_NETLABEL |
7420ed23 | 2915 | /** |
5778eabd PM |
2916 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
2917 | * @secattr: the NetLabel packet security attributes | |
5dbe1eb0 | 2918 | * @sid: the SELinux SID |
7420ed23 VY |
2919 | * |
2920 | * Description: | |
2921 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
2922 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
2923 | * already been initialized. | |
7420ed23 VY |
2924 | * |
2925 | */ | |
5778eabd | 2926 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
5dbe1eb0 | 2927 | u32 sid) |
7420ed23 | 2928 | { |
5dbe1eb0 | 2929 | u32 *sid_cache; |
7420ed23 | 2930 | |
5dbe1eb0 PM |
2931 | sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC); |
2932 | if (sid_cache == NULL) | |
5778eabd | 2933 | return; |
5dbe1eb0 PM |
2934 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
2935 | if (secattr->cache == NULL) { | |
2936 | kfree(sid_cache); | |
5778eabd | 2937 | return; |
0ec8abd7 | 2938 | } |
7420ed23 | 2939 | |
5dbe1eb0 PM |
2940 | *sid_cache = sid; |
2941 | secattr->cache->free = kfree; | |
2942 | secattr->cache->data = sid_cache; | |
5778eabd | 2943 | secattr->flags |= NETLBL_SECATTR_CACHE; |
7420ed23 VY |
2944 | } |
2945 | ||
2946 | /** | |
5778eabd | 2947 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 | 2948 | * @secattr: the NetLabel packet security attributes |
7420ed23 VY |
2949 | * @sid: the SELinux SID |
2950 | * | |
2951 | * Description: | |
5778eabd | 2952 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 2953 | * SELinux SID. If the @secattr field does not contain a full SELinux |
5dbe1eb0 PM |
2954 | * SID/context then use SECINITSID_NETMSG as the foundation. If possibile the |
2955 | * 'cache' field of @secattr is set and the CACHE flag is set; this is to | |
2956 | * allow the @secattr to be used by NetLabel to cache the secattr to SID | |
2957 | * conversion for future lookups. Returns zero on success, negative values on | |
2958 | * failure. | |
7420ed23 VY |
2959 | * |
2960 | */ | |
5778eabd | 2961 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
5778eabd | 2962 | u32 *sid) |
7420ed23 VY |
2963 | { |
2964 | int rc = -EIDRM; | |
2965 | struct context *ctx; | |
2966 | struct context ctx_new; | |
5778eabd PM |
2967 | |
2968 | if (!ss_initialized) { | |
2969 | *sid = SECSID_NULL; | |
2970 | return 0; | |
2971 | } | |
7420ed23 | 2972 | |
0804d113 | 2973 | read_lock(&policy_rwlock); |
7420ed23 | 2974 | |
701a90ba | 2975 | if (secattr->flags & NETLBL_SECATTR_CACHE) { |
5dbe1eb0 PM |
2976 | *sid = *(u32 *)secattr->cache->data; |
2977 | rc = 0; | |
16efd454 PM |
2978 | } else if (secattr->flags & NETLBL_SECATTR_SECID) { |
2979 | *sid = secattr->attr.secid; | |
2980 | rc = 0; | |
701a90ba | 2981 | } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
5dbe1eb0 | 2982 | ctx = sidtab_search(&sidtab, SECINITSID_NETMSG); |
7420ed23 VY |
2983 | if (ctx == NULL) |
2984 | goto netlbl_secattr_to_sid_return; | |
2985 | ||
81990fbd | 2986 | context_init(&ctx_new); |
7420ed23 VY |
2987 | ctx_new.user = ctx->user; |
2988 | ctx_new.role = ctx->role; | |
2989 | ctx_new.type = ctx->type; | |
02752760 | 2990 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 2991 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
02752760 | 2992 | if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat, |
16efd454 | 2993 | secattr->attr.mls.cat) != 0) |
7420ed23 | 2994 | goto netlbl_secattr_to_sid_return; |
81990fbd PM |
2995 | memcpy(&ctx_new.range.level[1].cat, |
2996 | &ctx_new.range.level[0].cat, | |
2997 | sizeof(ctx_new.range.level[0].cat)); | |
7420ed23 VY |
2998 | } |
2999 | if (mls_context_isvalid(&policydb, &ctx_new) != 1) | |
3000 | goto netlbl_secattr_to_sid_return_cleanup; | |
3001 | ||
3002 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
3003 | if (rc != 0) | |
3004 | goto netlbl_secattr_to_sid_return_cleanup; | |
3005 | ||
5dbe1eb0 | 3006 | security_netlbl_cache_add(secattr, *sid); |
5778eabd | 3007 | |
7420ed23 VY |
3008 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
3009 | } else { | |
388b2405 | 3010 | *sid = SECSID_NULL; |
7420ed23 VY |
3011 | rc = 0; |
3012 | } | |
3013 | ||
3014 | netlbl_secattr_to_sid_return: | |
0804d113 | 3015 | read_unlock(&policy_rwlock); |
7420ed23 VY |
3016 | return rc; |
3017 | netlbl_secattr_to_sid_return_cleanup: | |
3018 | ebitmap_destroy(&ctx_new.range.level[0].cat); | |
3019 | goto netlbl_secattr_to_sid_return; | |
3020 | } | |
3021 | ||
3022 | /** | |
5778eabd PM |
3023 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
3024 | * @sid: the SELinux SID | |
3025 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
3026 | * |
3027 | * Description: | |
5778eabd PM |
3028 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
3029 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
3030 | * |
3031 | */ | |
5778eabd | 3032 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 | 3033 | { |
99d854d2 | 3034 | int rc; |
7420ed23 VY |
3035 | struct context *ctx; |
3036 | ||
3037 | if (!ss_initialized) | |
3038 | return 0; | |
3039 | ||
0804d113 | 3040 | read_lock(&policy_rwlock); |
7420ed23 | 3041 | ctx = sidtab_search(&sidtab, sid); |
99d854d2 PM |
3042 | if (ctx == NULL) { |
3043 | rc = -ENOENT; | |
5778eabd | 3044 | goto netlbl_sid_to_secattr_failure; |
99d854d2 | 3045 | } |
5778eabd PM |
3046 | secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], |
3047 | GFP_ATOMIC); | |
99d854d2 PM |
3048 | if (secattr->domain == NULL) { |
3049 | rc = -ENOMEM; | |
3050 | goto netlbl_sid_to_secattr_failure; | |
3051 | } | |
8d75899d PM |
3052 | secattr->attr.secid = sid; |
3053 | secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID; | |
5778eabd PM |
3054 | mls_export_netlbl_lvl(ctx, secattr); |
3055 | rc = mls_export_netlbl_cat(ctx, secattr); | |
bf0edf39 | 3056 | if (rc != 0) |
5778eabd | 3057 | goto netlbl_sid_to_secattr_failure; |
0804d113 | 3058 | read_unlock(&policy_rwlock); |
99f59ed0 | 3059 | |
5778eabd | 3060 | return 0; |
f8687afe | 3061 | |
5778eabd | 3062 | netlbl_sid_to_secattr_failure: |
0804d113 | 3063 | read_unlock(&policy_rwlock); |
f8687afe PM |
3064 | return rc; |
3065 | } | |
7420ed23 | 3066 | #endif /* CONFIG_NETLABEL */ |