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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Implementation of the security services. | |
3 | * | |
4 | * Authors : Stephen Smalley, <sds@epoch.ncsc.mil> | |
5d55a345 | 5 | * James Morris <jmorris@redhat.com> |
1da177e4 LT |
6 | * |
7 | * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> | |
8 | * | |
9 | * Support for enhanced MLS infrastructure. | |
376bd9cb | 10 | * Support for context based audit filters. |
1da177e4 LT |
11 | * |
12 | * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> | |
13 | * | |
5d55a345 | 14 | * Added conditional policy language extensions |
1da177e4 | 15 | * |
7420ed23 VY |
16 | * Updated: Hewlett-Packard <paul.moore@hp.com> |
17 | * | |
18 | * Added support for NetLabel | |
3bb56b25 | 19 | * Added support for the policy capability bitmap |
7420ed23 | 20 | * |
b94c7e67 CS |
21 | * Updated: Chad Sellers <csellers@tresys.com> |
22 | * | |
23 | * Added validation of kernel classes and permissions | |
24 | * | |
3bb56b25 | 25 | * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. |
376bd9cb | 26 | * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. |
b94c7e67 | 27 | * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC |
1da177e4 LT |
28 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> |
29 | * This program is free software; you can redistribute it and/or modify | |
5d55a345 | 30 | * it under the terms of the GNU General Public License as published by |
1da177e4 LT |
31 | * the Free Software Foundation, version 2. |
32 | */ | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/string.h> | |
36 | #include <linux/spinlock.h> | |
9f2ad665 | 37 | #include <linux/rcupdate.h> |
1da177e4 LT |
38 | #include <linux/errno.h> |
39 | #include <linux/in.h> | |
40 | #include <linux/sched.h> | |
41 | #include <linux/audit.h> | |
bb003079 | 42 | #include <linux/mutex.h> |
0e55a004 | 43 | #include <linux/selinux.h> |
7420ed23 | 44 | #include <net/netlabel.h> |
bb003079 | 45 | |
1da177e4 LT |
46 | #include "flask.h" |
47 | #include "avc.h" | |
48 | #include "avc_ss.h" | |
49 | #include "security.h" | |
50 | #include "context.h" | |
51 | #include "policydb.h" | |
52 | #include "sidtab.h" | |
53 | #include "services.h" | |
54 | #include "conditional.h" | |
55 | #include "mls.h" | |
7420ed23 | 56 | #include "objsec.h" |
c60475bf | 57 | #include "netlabel.h" |
3de4bab5 | 58 | #include "xfrm.h" |
02752760 | 59 | #include "ebitmap.h" |
9d57a7f9 | 60 | #include "audit.h" |
1da177e4 LT |
61 | |
62 | extern void selnl_notify_policyload(u32 seqno); | |
63 | unsigned int policydb_loaded_version; | |
64 | ||
3bb56b25 | 65 | int selinux_policycap_netpeer; |
b0c636b9 | 66 | int selinux_policycap_openperm; |
3bb56b25 | 67 | |
b94c7e67 CS |
68 | /* |
69 | * This is declared in avc.c | |
70 | */ | |
71 | extern const struct selinux_class_perm selinux_class_perm; | |
72 | ||
1da177e4 | 73 | static DEFINE_RWLOCK(policy_rwlock); |
1da177e4 LT |
74 | |
75 | static struct sidtab sidtab; | |
76 | struct policydb policydb; | |
5d55a345 | 77 | int ss_initialized; |
1da177e4 LT |
78 | |
79 | /* | |
80 | * The largest sequence number that has been used when | |
81 | * providing an access decision to the access vector cache. | |
82 | * The sequence number only changes when a policy change | |
83 | * occurs. | |
84 | */ | |
5d55a345 | 85 | static u32 latest_granting; |
1da177e4 LT |
86 | |
87 | /* Forward declaration. */ | |
88 | static int context_struct_to_string(struct context *context, char **scontext, | |
89 | u32 *scontext_len); | |
90 | ||
91 | /* | |
92 | * Return the boolean value of a constraint expression | |
93 | * when it is applied to the specified source and target | |
94 | * security contexts. | |
95 | * | |
96 | * xcontext is a special beast... It is used by the validatetrans rules | |
97 | * only. For these rules, scontext is the context before the transition, | |
98 | * tcontext is the context after the transition, and xcontext is the context | |
99 | * of the process performing the transition. All other callers of | |
100 | * constraint_expr_eval should pass in NULL for xcontext. | |
101 | */ | |
102 | static int constraint_expr_eval(struct context *scontext, | |
103 | struct context *tcontext, | |
104 | struct context *xcontext, | |
105 | struct constraint_expr *cexpr) | |
106 | { | |
107 | u32 val1, val2; | |
108 | struct context *c; | |
109 | struct role_datum *r1, *r2; | |
110 | struct mls_level *l1, *l2; | |
111 | struct constraint_expr *e; | |
112 | int s[CEXPR_MAXDEPTH]; | |
113 | int sp = -1; | |
114 | ||
115 | for (e = cexpr; e; e = e->next) { | |
116 | switch (e->expr_type) { | |
117 | case CEXPR_NOT: | |
118 | BUG_ON(sp < 0); | |
119 | s[sp] = !s[sp]; | |
120 | break; | |
121 | case CEXPR_AND: | |
122 | BUG_ON(sp < 1); | |
123 | sp--; | |
124 | s[sp] &= s[sp+1]; | |
125 | break; | |
126 | case CEXPR_OR: | |
127 | BUG_ON(sp < 1); | |
128 | sp--; | |
129 | s[sp] |= s[sp+1]; | |
130 | break; | |
131 | case CEXPR_ATTR: | |
132 | if (sp == (CEXPR_MAXDEPTH-1)) | |
133 | return 0; | |
134 | switch (e->attr) { | |
135 | case CEXPR_USER: | |
136 | val1 = scontext->user; | |
137 | val2 = tcontext->user; | |
138 | break; | |
139 | case CEXPR_TYPE: | |
140 | val1 = scontext->type; | |
141 | val2 = tcontext->type; | |
142 | break; | |
143 | case CEXPR_ROLE: | |
144 | val1 = scontext->role; | |
145 | val2 = tcontext->role; | |
146 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
147 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
148 | switch (e->op) { | |
149 | case CEXPR_DOM: | |
150 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
151 | val2 - 1); | |
152 | continue; | |
153 | case CEXPR_DOMBY: | |
154 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
155 | val1 - 1); | |
156 | continue; | |
157 | case CEXPR_INCOMP: | |
5d55a345 EP |
158 | s[++sp] = (!ebitmap_get_bit(&r1->dominates, |
159 | val2 - 1) && | |
160 | !ebitmap_get_bit(&r2->dominates, | |
161 | val1 - 1)); | |
1da177e4 LT |
162 | continue; |
163 | default: | |
164 | break; | |
165 | } | |
166 | break; | |
167 | case CEXPR_L1L2: | |
168 | l1 = &(scontext->range.level[0]); | |
169 | l2 = &(tcontext->range.level[0]); | |
170 | goto mls_ops; | |
171 | case CEXPR_L1H2: | |
172 | l1 = &(scontext->range.level[0]); | |
173 | l2 = &(tcontext->range.level[1]); | |
174 | goto mls_ops; | |
175 | case CEXPR_H1L2: | |
176 | l1 = &(scontext->range.level[1]); | |
177 | l2 = &(tcontext->range.level[0]); | |
178 | goto mls_ops; | |
179 | case CEXPR_H1H2: | |
180 | l1 = &(scontext->range.level[1]); | |
181 | l2 = &(tcontext->range.level[1]); | |
182 | goto mls_ops; | |
183 | case CEXPR_L1H1: | |
184 | l1 = &(scontext->range.level[0]); | |
185 | l2 = &(scontext->range.level[1]); | |
186 | goto mls_ops; | |
187 | case CEXPR_L2H2: | |
188 | l1 = &(tcontext->range.level[0]); | |
189 | l2 = &(tcontext->range.level[1]); | |
190 | goto mls_ops; | |
191 | mls_ops: | |
192 | switch (e->op) { | |
193 | case CEXPR_EQ: | |
194 | s[++sp] = mls_level_eq(l1, l2); | |
195 | continue; | |
196 | case CEXPR_NEQ: | |
197 | s[++sp] = !mls_level_eq(l1, l2); | |
198 | continue; | |
199 | case CEXPR_DOM: | |
200 | s[++sp] = mls_level_dom(l1, l2); | |
201 | continue; | |
202 | case CEXPR_DOMBY: | |
203 | s[++sp] = mls_level_dom(l2, l1); | |
204 | continue; | |
205 | case CEXPR_INCOMP: | |
206 | s[++sp] = mls_level_incomp(l2, l1); | |
207 | continue; | |
208 | default: | |
209 | BUG(); | |
210 | return 0; | |
211 | } | |
212 | break; | |
213 | default: | |
214 | BUG(); | |
215 | return 0; | |
216 | } | |
217 | ||
218 | switch (e->op) { | |
219 | case CEXPR_EQ: | |
220 | s[++sp] = (val1 == val2); | |
221 | break; | |
222 | case CEXPR_NEQ: | |
223 | s[++sp] = (val1 != val2); | |
224 | break; | |
225 | default: | |
226 | BUG(); | |
227 | return 0; | |
228 | } | |
229 | break; | |
230 | case CEXPR_NAMES: | |
231 | if (sp == (CEXPR_MAXDEPTH-1)) | |
232 | return 0; | |
233 | c = scontext; | |
234 | if (e->attr & CEXPR_TARGET) | |
235 | c = tcontext; | |
236 | else if (e->attr & CEXPR_XTARGET) { | |
237 | c = xcontext; | |
238 | if (!c) { | |
239 | BUG(); | |
240 | return 0; | |
241 | } | |
242 | } | |
243 | if (e->attr & CEXPR_USER) | |
244 | val1 = c->user; | |
245 | else if (e->attr & CEXPR_ROLE) | |
246 | val1 = c->role; | |
247 | else if (e->attr & CEXPR_TYPE) | |
248 | val1 = c->type; | |
249 | else { | |
250 | BUG(); | |
251 | return 0; | |
252 | } | |
253 | ||
254 | switch (e->op) { | |
255 | case CEXPR_EQ: | |
256 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
257 | break; | |
258 | case CEXPR_NEQ: | |
259 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
260 | break; | |
261 | default: | |
262 | BUG(); | |
263 | return 0; | |
264 | } | |
265 | break; | |
266 | default: | |
267 | BUG(); | |
268 | return 0; | |
269 | } | |
270 | } | |
271 | ||
272 | BUG_ON(sp != 0); | |
273 | return s[0]; | |
274 | } | |
275 | ||
276 | /* | |
277 | * Compute access vectors based on a context structure pair for | |
278 | * the permissions in a particular class. | |
279 | */ | |
280 | static int context_struct_compute_av(struct context *scontext, | |
281 | struct context *tcontext, | |
282 | u16 tclass, | |
283 | u32 requested, | |
284 | struct av_decision *avd) | |
285 | { | |
286 | struct constraint_node *constraint; | |
287 | struct role_allow *ra; | |
288 | struct avtab_key avkey; | |
782ebb99 | 289 | struct avtab_node *node; |
1da177e4 | 290 | struct class_datum *tclass_datum; |
782ebb99 SS |
291 | struct ebitmap *sattr, *tattr; |
292 | struct ebitmap_node *snode, *tnode; | |
3f12070e | 293 | const struct selinux_class_perm *kdefs = &selinux_class_perm; |
782ebb99 | 294 | unsigned int i, j; |
1da177e4 LT |
295 | |
296 | /* | |
297 | * Remap extended Netlink classes for old policy versions. | |
298 | * Do this here rather than socket_type_to_security_class() | |
299 | * in case a newer policy version is loaded, allowing sockets | |
300 | * to remain in the correct class. | |
301 | */ | |
302 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
303 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
304 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
305 | tclass = SECCLASS_NETLINK_SOCKET; | |
306 | ||
1da177e4 LT |
307 | /* |
308 | * Initialize the access vectors to the default values. | |
309 | */ | |
310 | avd->allowed = 0; | |
311 | avd->decided = 0xffffffff; | |
312 | avd->auditallow = 0; | |
313 | avd->auditdeny = 0xffffffff; | |
314 | avd->seqno = latest_granting; | |
315 | ||
3f12070e EP |
316 | /* |
317 | * Check for all the invalid cases. | |
318 | * - tclass 0 | |
319 | * - tclass > policy and > kernel | |
320 | * - tclass > policy but is a userspace class | |
321 | * - tclass > policy but we do not allow unknowns | |
322 | */ | |
323 | if (unlikely(!tclass)) | |
324 | goto inval_class; | |
325 | if (unlikely(tclass > policydb.p_classes.nprim)) | |
326 | if (tclass > kdefs->cts_len || | |
cea78dc4 | 327 | !kdefs->class_to_string[tclass] || |
3f12070e EP |
328 | !policydb.allow_unknown) |
329 | goto inval_class; | |
330 | ||
331 | /* | |
332 | * Kernel class and we allow unknown so pad the allow decision | |
333 | * the pad will be all 1 for unknown classes. | |
334 | */ | |
335 | if (tclass <= kdefs->cts_len && policydb.allow_unknown) | |
336 | avd->allowed = policydb.undefined_perms[tclass - 1]; | |
337 | ||
338 | /* | |
339 | * Not in policy. Since decision is completed (all 1 or all 0) return. | |
340 | */ | |
341 | if (unlikely(tclass > policydb.p_classes.nprim)) | |
342 | return 0; | |
343 | ||
344 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
345 | ||
1da177e4 LT |
346 | /* |
347 | * If a specific type enforcement rule was defined for | |
348 | * this permission check, then use it. | |
349 | */ | |
1da177e4 | 350 | avkey.target_class = tclass; |
782ebb99 SS |
351 | avkey.specified = AVTAB_AV; |
352 | sattr = &policydb.type_attr_map[scontext->type - 1]; | |
353 | tattr = &policydb.type_attr_map[tcontext->type - 1]; | |
9fe79ad1 KK |
354 | ebitmap_for_each_positive_bit(sattr, snode, i) { |
355 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
782ebb99 SS |
356 | avkey.source_type = i + 1; |
357 | avkey.target_type = j + 1; | |
358 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
359 | node != NULL; | |
360 | node = avtab_search_node_next(node, avkey.specified)) { | |
361 | if (node->key.specified == AVTAB_ALLOWED) | |
362 | avd->allowed |= node->datum.data; | |
363 | else if (node->key.specified == AVTAB_AUDITALLOW) | |
364 | avd->auditallow |= node->datum.data; | |
365 | else if (node->key.specified == AVTAB_AUDITDENY) | |
366 | avd->auditdeny &= node->datum.data; | |
367 | } | |
1da177e4 | 368 | |
782ebb99 SS |
369 | /* Check conditional av table for additional permissions */ |
370 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); | |
371 | ||
372 | } | |
373 | } | |
1da177e4 LT |
374 | |
375 | /* | |
376 | * Remove any permissions prohibited by a constraint (this includes | |
377 | * the MLS policy). | |
378 | */ | |
379 | constraint = tclass_datum->constraints; | |
380 | while (constraint) { | |
381 | if ((constraint->permissions & (avd->allowed)) && | |
382 | !constraint_expr_eval(scontext, tcontext, NULL, | |
383 | constraint->expr)) { | |
384 | avd->allowed = (avd->allowed) & ~(constraint->permissions); | |
385 | } | |
386 | constraint = constraint->next; | |
387 | } | |
388 | ||
389 | /* | |
390 | * If checking process transition permission and the | |
391 | * role is changing, then check the (current_role, new_role) | |
392 | * pair. | |
393 | */ | |
394 | if (tclass == SECCLASS_PROCESS && | |
395 | (avd->allowed & (PROCESS__TRANSITION | PROCESS__DYNTRANSITION)) && | |
396 | scontext->role != tcontext->role) { | |
397 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
398 | if (scontext->role == ra->role && | |
399 | tcontext->role == ra->new_role) | |
400 | break; | |
401 | } | |
402 | if (!ra) | |
403 | avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION | | |
5d55a345 | 404 | PROCESS__DYNTRANSITION); |
1da177e4 LT |
405 | } |
406 | ||
407 | return 0; | |
3f12070e EP |
408 | |
409 | inval_class: | |
22df4adb SS |
410 | if (!tclass || tclass > kdefs->cts_len || |
411 | !kdefs->class_to_string[tclass]) { | |
412 | if (printk_ratelimit()) | |
413 | printk(KERN_ERR "SELinux: %s: unrecognized class %d\n", | |
414 | __func__, tclass); | |
415 | return -EINVAL; | |
416 | } | |
417 | ||
418 | /* | |
419 | * Known to the kernel, but not to the policy. | |
420 | * Handle as a denial (allowed is 0). | |
421 | */ | |
422 | return 0; | |
1da177e4 LT |
423 | } |
424 | ||
64dbf074 EP |
425 | /* |
426 | * Given a sid find if the type has the permissive flag set | |
427 | */ | |
428 | int security_permissive_sid(u32 sid) | |
429 | { | |
430 | struct context *context; | |
431 | u32 type; | |
432 | int rc; | |
433 | ||
0804d113 | 434 | read_lock(&policy_rwlock); |
64dbf074 EP |
435 | |
436 | context = sidtab_search(&sidtab, sid); | |
437 | BUG_ON(!context); | |
438 | ||
439 | type = context->type; | |
440 | /* | |
441 | * we are intentionally using type here, not type-1, the 0th bit may | |
442 | * someday indicate that we are globally setting permissive in policy. | |
443 | */ | |
444 | rc = ebitmap_get_bit(&policydb.permissive_map, type); | |
445 | ||
0804d113 | 446 | read_unlock(&policy_rwlock); |
64dbf074 EP |
447 | return rc; |
448 | } | |
449 | ||
1da177e4 | 450 | static int security_validtrans_handle_fail(struct context *ocontext, |
5d55a345 EP |
451 | struct context *ncontext, |
452 | struct context *tcontext, | |
453 | u16 tclass) | |
1da177e4 LT |
454 | { |
455 | char *o = NULL, *n = NULL, *t = NULL; | |
456 | u32 olen, nlen, tlen; | |
457 | ||
458 | if (context_struct_to_string(ocontext, &o, &olen) < 0) | |
459 | goto out; | |
460 | if (context_struct_to_string(ncontext, &n, &nlen) < 0) | |
461 | goto out; | |
462 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
463 | goto out; | |
9ad9ad38 | 464 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
5d55a345 EP |
465 | "security_validate_transition: denied for" |
466 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", | |
467 | o, n, t, policydb.p_class_val_to_name[tclass-1]); | |
1da177e4 LT |
468 | out: |
469 | kfree(o); | |
470 | kfree(n); | |
471 | kfree(t); | |
472 | ||
473 | if (!selinux_enforcing) | |
474 | return 0; | |
475 | return -EPERM; | |
476 | } | |
477 | ||
478 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
5d55a345 | 479 | u16 tclass) |
1da177e4 LT |
480 | { |
481 | struct context *ocontext; | |
482 | struct context *ncontext; | |
483 | struct context *tcontext; | |
484 | struct class_datum *tclass_datum; | |
485 | struct constraint_node *constraint; | |
486 | int rc = 0; | |
487 | ||
488 | if (!ss_initialized) | |
489 | return 0; | |
490 | ||
0804d113 | 491 | read_lock(&policy_rwlock); |
1da177e4 LT |
492 | |
493 | /* | |
494 | * Remap extended Netlink classes for old policy versions. | |
495 | * Do this here rather than socket_type_to_security_class() | |
496 | * in case a newer policy version is loaded, allowing sockets | |
497 | * to remain in the correct class. | |
498 | */ | |
499 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
500 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
501 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
502 | tclass = SECCLASS_NETLINK_SOCKET; | |
503 | ||
504 | if (!tclass || tclass > policydb.p_classes.nprim) { | |
744ba35e EP |
505 | printk(KERN_ERR "SELinux: %s: unrecognized class %d\n", |
506 | __func__, tclass); | |
1da177e4 LT |
507 | rc = -EINVAL; |
508 | goto out; | |
509 | } | |
510 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
511 | ||
512 | ocontext = sidtab_search(&sidtab, oldsid); | |
513 | if (!ocontext) { | |
744ba35e EP |
514 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
515 | __func__, oldsid); | |
1da177e4 LT |
516 | rc = -EINVAL; |
517 | goto out; | |
518 | } | |
519 | ||
520 | ncontext = sidtab_search(&sidtab, newsid); | |
521 | if (!ncontext) { | |
744ba35e EP |
522 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
523 | __func__, newsid); | |
1da177e4 LT |
524 | rc = -EINVAL; |
525 | goto out; | |
526 | } | |
527 | ||
528 | tcontext = sidtab_search(&sidtab, tasksid); | |
529 | if (!tcontext) { | |
744ba35e EP |
530 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
531 | __func__, tasksid); | |
1da177e4 LT |
532 | rc = -EINVAL; |
533 | goto out; | |
534 | } | |
535 | ||
536 | constraint = tclass_datum->validatetrans; | |
537 | while (constraint) { | |
538 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
5d55a345 | 539 | constraint->expr)) { |
1da177e4 | 540 | rc = security_validtrans_handle_fail(ocontext, ncontext, |
5d55a345 | 541 | tcontext, tclass); |
1da177e4 LT |
542 | goto out; |
543 | } | |
544 | constraint = constraint->next; | |
545 | } | |
546 | ||
547 | out: | |
0804d113 | 548 | read_unlock(&policy_rwlock); |
1da177e4 LT |
549 | return rc; |
550 | } | |
551 | ||
552 | /** | |
553 | * security_compute_av - Compute access vector decisions. | |
554 | * @ssid: source security identifier | |
555 | * @tsid: target security identifier | |
556 | * @tclass: target security class | |
557 | * @requested: requested permissions | |
558 | * @avd: access vector decisions | |
559 | * | |
560 | * Compute a set of access vector decisions based on the | |
561 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
562 | * Return -%EINVAL if any of the parameters are invalid or %0 | |
563 | * if the access vector decisions were computed successfully. | |
564 | */ | |
565 | int security_compute_av(u32 ssid, | |
566 | u32 tsid, | |
567 | u16 tclass, | |
568 | u32 requested, | |
569 | struct av_decision *avd) | |
570 | { | |
571 | struct context *scontext = NULL, *tcontext = NULL; | |
572 | int rc = 0; | |
573 | ||
574 | if (!ss_initialized) { | |
4c443d1b SS |
575 | avd->allowed = 0xffffffff; |
576 | avd->decided = 0xffffffff; | |
1da177e4 LT |
577 | avd->auditallow = 0; |
578 | avd->auditdeny = 0xffffffff; | |
579 | avd->seqno = latest_granting; | |
580 | return 0; | |
581 | } | |
582 | ||
0804d113 | 583 | read_lock(&policy_rwlock); |
1da177e4 LT |
584 | |
585 | scontext = sidtab_search(&sidtab, ssid); | |
586 | if (!scontext) { | |
744ba35e EP |
587 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
588 | __func__, ssid); | |
1da177e4 LT |
589 | rc = -EINVAL; |
590 | goto out; | |
591 | } | |
592 | tcontext = sidtab_search(&sidtab, tsid); | |
593 | if (!tcontext) { | |
744ba35e EP |
594 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
595 | __func__, tsid); | |
1da177e4 LT |
596 | rc = -EINVAL; |
597 | goto out; | |
598 | } | |
599 | ||
600 | rc = context_struct_compute_av(scontext, tcontext, tclass, | |
601 | requested, avd); | |
602 | out: | |
0804d113 | 603 | read_unlock(&policy_rwlock); |
1da177e4 LT |
604 | return rc; |
605 | } | |
606 | ||
607 | /* | |
608 | * Write the security context string representation of | |
609 | * the context structure `context' into a dynamically | |
610 | * allocated string of the correct size. Set `*scontext' | |
611 | * to point to this string and set `*scontext_len' to | |
612 | * the length of the string. | |
613 | */ | |
614 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
615 | { | |
616 | char *scontextp; | |
617 | ||
618 | *scontext = NULL; | |
619 | *scontext_len = 0; | |
620 | ||
12b29f34 SS |
621 | if (context->len) { |
622 | *scontext_len = context->len; | |
623 | *scontext = kstrdup(context->str, GFP_ATOMIC); | |
624 | if (!(*scontext)) | |
625 | return -ENOMEM; | |
626 | return 0; | |
627 | } | |
628 | ||
1da177e4 LT |
629 | /* Compute the size of the context. */ |
630 | *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; | |
631 | *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; | |
632 | *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; | |
633 | *scontext_len += mls_compute_context_len(context); | |
634 | ||
635 | /* Allocate space for the context; caller must free this space. */ | |
636 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
5d55a345 | 637 | if (!scontextp) |
1da177e4 | 638 | return -ENOMEM; |
1da177e4 LT |
639 | *scontext = scontextp; |
640 | ||
641 | /* | |
642 | * Copy the user name, role name and type name into the context. | |
643 | */ | |
644 | sprintf(scontextp, "%s:%s:%s", | |
645 | policydb.p_user_val_to_name[context->user - 1], | |
646 | policydb.p_role_val_to_name[context->role - 1], | |
647 | policydb.p_type_val_to_name[context->type - 1]); | |
648 | scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + | |
5d55a345 EP |
649 | 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + |
650 | 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); | |
1da177e4 LT |
651 | |
652 | mls_sid_to_context(context, &scontextp); | |
653 | ||
654 | *scontextp = 0; | |
655 | ||
656 | return 0; | |
657 | } | |
658 | ||
659 | #include "initial_sid_to_string.h" | |
660 | ||
f0ee2e46 JC |
661 | const char *security_get_initial_sid_context(u32 sid) |
662 | { | |
663 | if (unlikely(sid > SECINITSID_NUM)) | |
664 | return NULL; | |
665 | return initial_sid_to_string[sid]; | |
666 | } | |
667 | ||
12b29f34 SS |
668 | static int security_sid_to_context_core(u32 sid, char **scontext, |
669 | u32 *scontext_len, int force) | |
1da177e4 LT |
670 | { |
671 | struct context *context; | |
672 | int rc = 0; | |
673 | ||
4f4acf3a SS |
674 | *scontext = NULL; |
675 | *scontext_len = 0; | |
676 | ||
1da177e4 LT |
677 | if (!ss_initialized) { |
678 | if (sid <= SECINITSID_NUM) { | |
679 | char *scontextp; | |
680 | ||
681 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
5d55a345 | 682 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); |
0cccca06 SH |
683 | if (!scontextp) { |
684 | rc = -ENOMEM; | |
685 | goto out; | |
686 | } | |
1da177e4 LT |
687 | strcpy(scontextp, initial_sid_to_string[sid]); |
688 | *scontext = scontextp; | |
689 | goto out; | |
690 | } | |
744ba35e EP |
691 | printk(KERN_ERR "SELinux: %s: called before initial " |
692 | "load_policy on unknown SID %d\n", __func__, sid); | |
1da177e4 LT |
693 | rc = -EINVAL; |
694 | goto out; | |
695 | } | |
0804d113 | 696 | read_lock(&policy_rwlock); |
12b29f34 SS |
697 | if (force) |
698 | context = sidtab_search_force(&sidtab, sid); | |
699 | else | |
700 | context = sidtab_search(&sidtab, sid); | |
1da177e4 | 701 | if (!context) { |
744ba35e EP |
702 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
703 | __func__, sid); | |
1da177e4 LT |
704 | rc = -EINVAL; |
705 | goto out_unlock; | |
706 | } | |
707 | rc = context_struct_to_string(context, scontext, scontext_len); | |
708 | out_unlock: | |
0804d113 | 709 | read_unlock(&policy_rwlock); |
1da177e4 LT |
710 | out: |
711 | return rc; | |
712 | ||
713 | } | |
714 | ||
12b29f34 SS |
715 | /** |
716 | * security_sid_to_context - Obtain a context for a given SID. | |
717 | * @sid: security identifier, SID | |
718 | * @scontext: security context | |
719 | * @scontext_len: length in bytes | |
720 | * | |
721 | * Write the string representation of the context associated with @sid | |
722 | * into a dynamically allocated string of the correct size. Set @scontext | |
723 | * to point to this string and set @scontext_len to the length of the string. | |
724 | */ | |
725 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
1da177e4 | 726 | { |
12b29f34 SS |
727 | return security_sid_to_context_core(sid, scontext, scontext_len, 0); |
728 | } | |
729 | ||
730 | int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len) | |
731 | { | |
732 | return security_sid_to_context_core(sid, scontext, scontext_len, 1); | |
733 | } | |
734 | ||
9a59daa0 SS |
735 | /* |
736 | * Caveat: Mutates scontext. | |
737 | */ | |
12b29f34 SS |
738 | static int string_to_context_struct(struct policydb *pol, |
739 | struct sidtab *sidtabp, | |
9a59daa0 | 740 | char *scontext, |
12b29f34 SS |
741 | u32 scontext_len, |
742 | struct context *ctx, | |
9a59daa0 | 743 | u32 def_sid) |
12b29f34 | 744 | { |
1da177e4 LT |
745 | struct role_datum *role; |
746 | struct type_datum *typdatum; | |
747 | struct user_datum *usrdatum; | |
748 | char *scontextp, *p, oldc; | |
749 | int rc = 0; | |
750 | ||
12b29f34 | 751 | context_init(ctx); |
1da177e4 | 752 | |
1da177e4 LT |
753 | /* Parse the security context. */ |
754 | ||
755 | rc = -EINVAL; | |
9a59daa0 | 756 | scontextp = (char *) scontext; |
1da177e4 LT |
757 | |
758 | /* Extract the user. */ | |
759 | p = scontextp; | |
760 | while (*p && *p != ':') | |
761 | p++; | |
762 | ||
763 | if (*p == 0) | |
12b29f34 | 764 | goto out; |
1da177e4 LT |
765 | |
766 | *p++ = 0; | |
767 | ||
12b29f34 | 768 | usrdatum = hashtab_search(pol->p_users.table, scontextp); |
1da177e4 | 769 | if (!usrdatum) |
12b29f34 | 770 | goto out; |
1da177e4 | 771 | |
12b29f34 | 772 | ctx->user = usrdatum->value; |
1da177e4 LT |
773 | |
774 | /* Extract role. */ | |
775 | scontextp = p; | |
776 | while (*p && *p != ':') | |
777 | p++; | |
778 | ||
779 | if (*p == 0) | |
12b29f34 | 780 | goto out; |
1da177e4 LT |
781 | |
782 | *p++ = 0; | |
783 | ||
12b29f34 | 784 | role = hashtab_search(pol->p_roles.table, scontextp); |
1da177e4 | 785 | if (!role) |
12b29f34 SS |
786 | goto out; |
787 | ctx->role = role->value; | |
1da177e4 LT |
788 | |
789 | /* Extract type. */ | |
790 | scontextp = p; | |
791 | while (*p && *p != ':') | |
792 | p++; | |
793 | oldc = *p; | |
794 | *p++ = 0; | |
795 | ||
12b29f34 | 796 | typdatum = hashtab_search(pol->p_types.table, scontextp); |
1da177e4 | 797 | if (!typdatum) |
12b29f34 | 798 | goto out; |
1da177e4 | 799 | |
12b29f34 | 800 | ctx->type = typdatum->value; |
1da177e4 | 801 | |
12b29f34 | 802 | rc = mls_context_to_sid(pol, oldc, &p, ctx, sidtabp, def_sid); |
1da177e4 | 803 | if (rc) |
12b29f34 | 804 | goto out; |
1da177e4 | 805 | |
9a59daa0 | 806 | if ((p - scontext) < scontext_len) { |
1da177e4 | 807 | rc = -EINVAL; |
12b29f34 | 808 | goto out; |
1da177e4 LT |
809 | } |
810 | ||
811 | /* Check the validity of the new context. */ | |
12b29f34 | 812 | if (!policydb_context_isvalid(pol, ctx)) { |
1da177e4 | 813 | rc = -EINVAL; |
12b29f34 SS |
814 | context_destroy(ctx); |
815 | goto out; | |
1da177e4 | 816 | } |
12b29f34 SS |
817 | rc = 0; |
818 | out: | |
12b29f34 SS |
819 | return rc; |
820 | } | |
821 | ||
822 | static int security_context_to_sid_core(const char *scontext, u32 scontext_len, | |
823 | u32 *sid, u32 def_sid, gfp_t gfp_flags, | |
824 | int force) | |
825 | { | |
9a59daa0 | 826 | char *scontext2, *str = NULL; |
12b29f34 SS |
827 | struct context context; |
828 | int rc = 0; | |
829 | ||
830 | if (!ss_initialized) { | |
831 | int i; | |
832 | ||
833 | for (i = 1; i < SECINITSID_NUM; i++) { | |
834 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
835 | *sid = i; | |
9a59daa0 | 836 | return 0; |
12b29f34 SS |
837 | } |
838 | } | |
839 | *sid = SECINITSID_KERNEL; | |
9a59daa0 | 840 | return 0; |
12b29f34 SS |
841 | } |
842 | *sid = SECSID_NULL; | |
843 | ||
9a59daa0 SS |
844 | /* Copy the string so that we can modify the copy as we parse it. */ |
845 | scontext2 = kmalloc(scontext_len+1, gfp_flags); | |
846 | if (!scontext2) | |
847 | return -ENOMEM; | |
848 | memcpy(scontext2, scontext, scontext_len); | |
849 | scontext2[scontext_len] = 0; | |
850 | ||
851 | if (force) { | |
852 | /* Save another copy for storing in uninterpreted form */ | |
853 | str = kstrdup(scontext2, gfp_flags); | |
854 | if (!str) { | |
855 | kfree(scontext2); | |
856 | return -ENOMEM; | |
857 | } | |
858 | } | |
859 | ||
0804d113 | 860 | read_lock(&policy_rwlock); |
12b29f34 | 861 | rc = string_to_context_struct(&policydb, &sidtab, |
9a59daa0 SS |
862 | scontext2, scontext_len, |
863 | &context, def_sid); | |
12b29f34 | 864 | if (rc == -EINVAL && force) { |
9a59daa0 | 865 | context.str = str; |
12b29f34 | 866 | context.len = scontext_len; |
9a59daa0 | 867 | str = NULL; |
12b29f34 SS |
868 | } else if (rc) |
869 | goto out; | |
870 | rc = sidtab_context_to_sid(&sidtab, &context, sid); | |
871 | if (rc) | |
872 | context_destroy(&context); | |
1da177e4 | 873 | out: |
0804d113 | 874 | read_unlock(&policy_rwlock); |
9a59daa0 SS |
875 | kfree(scontext2); |
876 | kfree(str); | |
1da177e4 LT |
877 | return rc; |
878 | } | |
879 | ||
f5c1d5b2 JM |
880 | /** |
881 | * security_context_to_sid - Obtain a SID for a given security context. | |
882 | * @scontext: security context | |
883 | * @scontext_len: length in bytes | |
884 | * @sid: security identifier, SID | |
885 | * | |
886 | * Obtains a SID associated with the security context that | |
887 | * has the string representation specified by @scontext. | |
888 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
889 | * memory is available, or 0 on success. | |
890 | */ | |
8f0cfa52 | 891 | int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid) |
f5c1d5b2 JM |
892 | { |
893 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 | 894 | sid, SECSID_NULL, GFP_KERNEL, 0); |
f5c1d5b2 JM |
895 | } |
896 | ||
897 | /** | |
898 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
899 | * falling back to specified default if needed. | |
900 | * | |
901 | * @scontext: security context | |
902 | * @scontext_len: length in bytes | |
903 | * @sid: security identifier, SID | |
d133a960 | 904 | * @def_sid: default SID to assign on error |
f5c1d5b2 JM |
905 | * |
906 | * Obtains a SID associated with the security context that | |
907 | * has the string representation specified by @scontext. | |
908 | * The default SID is passed to the MLS layer to be used to allow | |
909 | * kernel labeling of the MLS field if the MLS field is not present | |
910 | * (for upgrading to MLS without full relabel). | |
12b29f34 | 911 | * Implicitly forces adding of the context even if it cannot be mapped yet. |
f5c1d5b2 JM |
912 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient |
913 | * memory is available, or 0 on success. | |
914 | */ | |
7bf570dc DH |
915 | int security_context_to_sid_default(const char *scontext, u32 scontext_len, |
916 | u32 *sid, u32 def_sid, gfp_t gfp_flags) | |
f5c1d5b2 JM |
917 | { |
918 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 SS |
919 | sid, def_sid, gfp_flags, 1); |
920 | } | |
921 | ||
922 | int security_context_to_sid_force(const char *scontext, u32 scontext_len, | |
923 | u32 *sid) | |
924 | { | |
925 | return security_context_to_sid_core(scontext, scontext_len, | |
926 | sid, SECSID_NULL, GFP_KERNEL, 1); | |
f5c1d5b2 JM |
927 | } |
928 | ||
1da177e4 LT |
929 | static int compute_sid_handle_invalid_context( |
930 | struct context *scontext, | |
931 | struct context *tcontext, | |
932 | u16 tclass, | |
933 | struct context *newcontext) | |
934 | { | |
935 | char *s = NULL, *t = NULL, *n = NULL; | |
936 | u32 slen, tlen, nlen; | |
937 | ||
938 | if (context_struct_to_string(scontext, &s, &slen) < 0) | |
939 | goto out; | |
940 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
941 | goto out; | |
942 | if (context_struct_to_string(newcontext, &n, &nlen) < 0) | |
943 | goto out; | |
9ad9ad38 | 944 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
945 | "security_compute_sid: invalid context %s" |
946 | " for scontext=%s" | |
947 | " tcontext=%s" | |
948 | " tclass=%s", | |
949 | n, s, t, policydb.p_class_val_to_name[tclass-1]); | |
950 | out: | |
951 | kfree(s); | |
952 | kfree(t); | |
953 | kfree(n); | |
954 | if (!selinux_enforcing) | |
955 | return 0; | |
956 | return -EACCES; | |
957 | } | |
958 | ||
959 | static int security_compute_sid(u32 ssid, | |
960 | u32 tsid, | |
961 | u16 tclass, | |
962 | u32 specified, | |
963 | u32 *out_sid) | |
964 | { | |
965 | struct context *scontext = NULL, *tcontext = NULL, newcontext; | |
966 | struct role_trans *roletr = NULL; | |
967 | struct avtab_key avkey; | |
968 | struct avtab_datum *avdatum; | |
969 | struct avtab_node *node; | |
1da177e4 LT |
970 | int rc = 0; |
971 | ||
972 | if (!ss_initialized) { | |
973 | switch (tclass) { | |
974 | case SECCLASS_PROCESS: | |
975 | *out_sid = ssid; | |
976 | break; | |
977 | default: | |
978 | *out_sid = tsid; | |
979 | break; | |
980 | } | |
981 | goto out; | |
982 | } | |
983 | ||
851f8a69 VY |
984 | context_init(&newcontext); |
985 | ||
0804d113 | 986 | read_lock(&policy_rwlock); |
1da177e4 LT |
987 | |
988 | scontext = sidtab_search(&sidtab, ssid); | |
989 | if (!scontext) { | |
744ba35e EP |
990 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
991 | __func__, ssid); | |
1da177e4 LT |
992 | rc = -EINVAL; |
993 | goto out_unlock; | |
994 | } | |
995 | tcontext = sidtab_search(&sidtab, tsid); | |
996 | if (!tcontext) { | |
744ba35e EP |
997 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
998 | __func__, tsid); | |
1da177e4 LT |
999 | rc = -EINVAL; |
1000 | goto out_unlock; | |
1001 | } | |
1002 | ||
1da177e4 LT |
1003 | /* Set the user identity. */ |
1004 | switch (specified) { | |
1005 | case AVTAB_TRANSITION: | |
1006 | case AVTAB_CHANGE: | |
1007 | /* Use the process user identity. */ | |
1008 | newcontext.user = scontext->user; | |
1009 | break; | |
1010 | case AVTAB_MEMBER: | |
1011 | /* Use the related object owner. */ | |
1012 | newcontext.user = tcontext->user; | |
1013 | break; | |
1014 | } | |
1015 | ||
1016 | /* Set the role and type to default values. */ | |
1017 | switch (tclass) { | |
1018 | case SECCLASS_PROCESS: | |
1019 | /* Use the current role and type of process. */ | |
1020 | newcontext.role = scontext->role; | |
1021 | newcontext.type = scontext->type; | |
1022 | break; | |
1023 | default: | |
1024 | /* Use the well-defined object role. */ | |
1025 | newcontext.role = OBJECT_R_VAL; | |
1026 | /* Use the type of the related object. */ | |
1027 | newcontext.type = tcontext->type; | |
1028 | } | |
1029 | ||
1030 | /* Look for a type transition/member/change rule. */ | |
1031 | avkey.source_type = scontext->type; | |
1032 | avkey.target_type = tcontext->type; | |
1033 | avkey.target_class = tclass; | |
782ebb99 SS |
1034 | avkey.specified = specified; |
1035 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
1036 | |
1037 | /* If no permanent rule, also check for enabled conditional rules */ | |
5d55a345 | 1038 | if (!avdatum) { |
782ebb99 | 1039 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
1da177e4 | 1040 | for (; node != NULL; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 1041 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
1042 | avdatum = &node->datum; |
1043 | break; | |
1044 | } | |
1045 | } | |
1046 | } | |
1047 | ||
782ebb99 | 1048 | if (avdatum) { |
1da177e4 | 1049 | /* Use the type from the type transition/member/change rule. */ |
782ebb99 | 1050 | newcontext.type = avdatum->data; |
1da177e4 LT |
1051 | } |
1052 | ||
1053 | /* Check for class-specific changes. */ | |
1054 | switch (tclass) { | |
1055 | case SECCLASS_PROCESS: | |
1056 | if (specified & AVTAB_TRANSITION) { | |
1057 | /* Look for a role transition rule. */ | |
1058 | for (roletr = policydb.role_tr; roletr; | |
1059 | roletr = roletr->next) { | |
1060 | if (roletr->role == scontext->role && | |
1061 | roletr->type == tcontext->type) { | |
1062 | /* Use the role transition rule. */ | |
1063 | newcontext.role = roletr->new_role; | |
1064 | break; | |
1065 | } | |
1066 | } | |
1067 | } | |
1068 | break; | |
1069 | default: | |
1070 | break; | |
1071 | } | |
1072 | ||
1073 | /* Set the MLS attributes. | |
1074 | This is done last because it may allocate memory. */ | |
1075 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext); | |
1076 | if (rc) | |
1077 | goto out_unlock; | |
1078 | ||
1079 | /* Check the validity of the context. */ | |
1080 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
1081 | rc = compute_sid_handle_invalid_context(scontext, | |
1082 | tcontext, | |
1083 | tclass, | |
1084 | &newcontext); | |
1085 | if (rc) | |
1086 | goto out_unlock; | |
1087 | } | |
1088 | /* Obtain the sid for the context. */ | |
1089 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
1090 | out_unlock: | |
0804d113 | 1091 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1092 | context_destroy(&newcontext); |
1093 | out: | |
1094 | return rc; | |
1095 | } | |
1096 | ||
1097 | /** | |
1098 | * security_transition_sid - Compute the SID for a new subject/object. | |
1099 | * @ssid: source security identifier | |
1100 | * @tsid: target security identifier | |
1101 | * @tclass: target security class | |
1102 | * @out_sid: security identifier for new subject/object | |
1103 | * | |
1104 | * Compute a SID to use for labeling a new subject or object in the | |
1105 | * class @tclass based on a SID pair (@ssid, @tsid). | |
1106 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1107 | * if insufficient memory is available, or %0 if the new SID was | |
1108 | * computed successfully. | |
1109 | */ | |
1110 | int security_transition_sid(u32 ssid, | |
1111 | u32 tsid, | |
1112 | u16 tclass, | |
1113 | u32 *out_sid) | |
1114 | { | |
1115 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid); | |
1116 | } | |
1117 | ||
1118 | /** | |
1119 | * security_member_sid - Compute the SID for member selection. | |
1120 | * @ssid: source security identifier | |
1121 | * @tsid: target security identifier | |
1122 | * @tclass: target security class | |
1123 | * @out_sid: security identifier for selected member | |
1124 | * | |
1125 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1126 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1127 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1128 | * if insufficient memory is available, or %0 if the SID was | |
1129 | * computed successfully. | |
1130 | */ | |
1131 | int security_member_sid(u32 ssid, | |
1132 | u32 tsid, | |
1133 | u16 tclass, | |
1134 | u32 *out_sid) | |
1135 | { | |
1136 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid); | |
1137 | } | |
1138 | ||
1139 | /** | |
1140 | * security_change_sid - Compute the SID for object relabeling. | |
1141 | * @ssid: source security identifier | |
1142 | * @tsid: target security identifier | |
1143 | * @tclass: target security class | |
1144 | * @out_sid: security identifier for selected member | |
1145 | * | |
1146 | * Compute a SID to use for relabeling an object of class @tclass | |
1147 | * based on a SID pair (@ssid, @tsid). | |
1148 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1149 | * if insufficient memory is available, or %0 if the SID was | |
1150 | * computed successfully. | |
1151 | */ | |
1152 | int security_change_sid(u32 ssid, | |
1153 | u32 tsid, | |
1154 | u16 tclass, | |
1155 | u32 *out_sid) | |
1156 | { | |
1157 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid); | |
1158 | } | |
1159 | ||
b94c7e67 CS |
1160 | /* |
1161 | * Verify that each kernel class that is defined in the | |
1162 | * policy is correct | |
1163 | */ | |
1164 | static int validate_classes(struct policydb *p) | |
1165 | { | |
1166 | int i, j; | |
1167 | struct class_datum *cladatum; | |
1168 | struct perm_datum *perdatum; | |
1169 | u32 nprim, tmp, common_pts_len, perm_val, pol_val; | |
1170 | u16 class_val; | |
1171 | const struct selinux_class_perm *kdefs = &selinux_class_perm; | |
1172 | const char *def_class, *def_perm, *pol_class; | |
1173 | struct symtab *perms; | |
6cbe2706 | 1174 | bool print_unknown_handle = 0; |
b94c7e67 | 1175 | |
3f12070e EP |
1176 | if (p->allow_unknown) { |
1177 | u32 num_classes = kdefs->cts_len; | |
1178 | p->undefined_perms = kcalloc(num_classes, sizeof(u32), GFP_KERNEL); | |
1179 | if (!p->undefined_perms) | |
1180 | return -ENOMEM; | |
1181 | } | |
1182 | ||
b94c7e67 CS |
1183 | for (i = 1; i < kdefs->cts_len; i++) { |
1184 | def_class = kdefs->class_to_string[i]; | |
a764ae4b SS |
1185 | if (!def_class) |
1186 | continue; | |
b94c7e67 CS |
1187 | if (i > p->p_classes.nprim) { |
1188 | printk(KERN_INFO | |
454d972c | 1189 | "SELinux: class %s not defined in policy\n", |
b94c7e67 | 1190 | def_class); |
3f12070e EP |
1191 | if (p->reject_unknown) |
1192 | return -EINVAL; | |
1193 | if (p->allow_unknown) | |
1194 | p->undefined_perms[i-1] = ~0U; | |
6cbe2706 | 1195 | print_unknown_handle = 1; |
b94c7e67 CS |
1196 | continue; |
1197 | } | |
1198 | pol_class = p->p_class_val_to_name[i-1]; | |
1199 | if (strcmp(pol_class, def_class)) { | |
1200 | printk(KERN_ERR | |
454d972c | 1201 | "SELinux: class %d is incorrect, found %s but should be %s\n", |
b94c7e67 CS |
1202 | i, pol_class, def_class); |
1203 | return -EINVAL; | |
1204 | } | |
1205 | } | |
1206 | for (i = 0; i < kdefs->av_pts_len; i++) { | |
1207 | class_val = kdefs->av_perm_to_string[i].tclass; | |
1208 | perm_val = kdefs->av_perm_to_string[i].value; | |
1209 | def_perm = kdefs->av_perm_to_string[i].name; | |
1210 | if (class_val > p->p_classes.nprim) | |
1211 | continue; | |
1212 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1213 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1214 | BUG_ON(!cladatum); | |
1215 | perms = &cladatum->permissions; | |
1216 | nprim = 1 << (perms->nprim - 1); | |
1217 | if (perm_val > nprim) { | |
1218 | printk(KERN_INFO | |
454d972c | 1219 | "SELinux: permission %s in class %s not defined in policy\n", |
b94c7e67 | 1220 | def_perm, pol_class); |
3f12070e EP |
1221 | if (p->reject_unknown) |
1222 | return -EINVAL; | |
1223 | if (p->allow_unknown) | |
1224 | p->undefined_perms[class_val-1] |= perm_val; | |
6cbe2706 | 1225 | print_unknown_handle = 1; |
b94c7e67 CS |
1226 | continue; |
1227 | } | |
1228 | perdatum = hashtab_search(perms->table, def_perm); | |
1229 | if (perdatum == NULL) { | |
1230 | printk(KERN_ERR | |
454d972c | 1231 | "SELinux: permission %s in class %s not found in policy, bad policy\n", |
b94c7e67 CS |
1232 | def_perm, pol_class); |
1233 | return -EINVAL; | |
1234 | } | |
1235 | pol_val = 1 << (perdatum->value - 1); | |
1236 | if (pol_val != perm_val) { | |
1237 | printk(KERN_ERR | |
454d972c | 1238 | "SELinux: permission %s in class %s has incorrect value\n", |
b94c7e67 CS |
1239 | def_perm, pol_class); |
1240 | return -EINVAL; | |
1241 | } | |
1242 | } | |
1243 | for (i = 0; i < kdefs->av_inherit_len; i++) { | |
1244 | class_val = kdefs->av_inherit[i].tclass; | |
1245 | if (class_val > p->p_classes.nprim) | |
1246 | continue; | |
1247 | pol_class = p->p_class_val_to_name[class_val-1]; | |
1248 | cladatum = hashtab_search(p->p_classes.table, pol_class); | |
1249 | BUG_ON(!cladatum); | |
1250 | if (!cladatum->comdatum) { | |
1251 | printk(KERN_ERR | |
454d972c | 1252 | "SELinux: class %s should have an inherits clause but does not\n", |
b94c7e67 CS |
1253 | pol_class); |
1254 | return -EINVAL; | |
1255 | } | |
1256 | tmp = kdefs->av_inherit[i].common_base; | |
1257 | common_pts_len = 0; | |
1258 | while (!(tmp & 0x01)) { | |
1259 | common_pts_len++; | |
1260 | tmp >>= 1; | |
1261 | } | |
1262 | perms = &cladatum->comdatum->permissions; | |
1263 | for (j = 0; j < common_pts_len; j++) { | |
1264 | def_perm = kdefs->av_inherit[i].common_pts[j]; | |
1265 | if (j >= perms->nprim) { | |
1266 | printk(KERN_INFO | |
454d972c | 1267 | "SELinux: permission %s in class %s not defined in policy\n", |
b94c7e67 | 1268 | def_perm, pol_class); |
3f12070e EP |
1269 | if (p->reject_unknown) |
1270 | return -EINVAL; | |
1271 | if (p->allow_unknown) | |
1272 | p->undefined_perms[class_val-1] |= (1 << j); | |
6cbe2706 | 1273 | print_unknown_handle = 1; |
b94c7e67 CS |
1274 | continue; |
1275 | } | |
1276 | perdatum = hashtab_search(perms->table, def_perm); | |
1277 | if (perdatum == NULL) { | |
1278 | printk(KERN_ERR | |
454d972c | 1279 | "SELinux: permission %s in class %s not found in policy, bad policy\n", |
b94c7e67 CS |
1280 | def_perm, pol_class); |
1281 | return -EINVAL; | |
1282 | } | |
1283 | if (perdatum->value != j + 1) { | |
1284 | printk(KERN_ERR | |
454d972c | 1285 | "SELinux: permission %s in class %s has incorrect value\n", |
b94c7e67 CS |
1286 | def_perm, pol_class); |
1287 | return -EINVAL; | |
1288 | } | |
1289 | } | |
1290 | } | |
6cbe2706 EP |
1291 | if (print_unknown_handle) |
1292 | printk(KERN_INFO "SELinux: the above unknown classes and permissions will be %s\n", | |
1293 | (security_get_allow_unknown() ? "allowed" : "denied")); | |
b94c7e67 CS |
1294 | return 0; |
1295 | } | |
1296 | ||
1da177e4 LT |
1297 | /* Clone the SID into the new SID table. */ |
1298 | static int clone_sid(u32 sid, | |
1299 | struct context *context, | |
1300 | void *arg) | |
1301 | { | |
1302 | struct sidtab *s = arg; | |
1303 | ||
1304 | return sidtab_insert(s, sid, context); | |
1305 | } | |
1306 | ||
1307 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1308 | { | |
1309 | int rc = 0; | |
1310 | ||
1311 | if (selinux_enforcing) { | |
1312 | rc = -EINVAL; | |
1313 | } else { | |
1314 | char *s; | |
1315 | u32 len; | |
1316 | ||
12b29f34 SS |
1317 | if (!context_struct_to_string(context, &s, &len)) { |
1318 | printk(KERN_WARNING | |
1319 | "SELinux: Context %s would be invalid if enforcing\n", | |
1320 | s); | |
1321 | kfree(s); | |
1322 | } | |
1da177e4 LT |
1323 | } |
1324 | return rc; | |
1325 | } | |
1326 | ||
1327 | struct convert_context_args { | |
1328 | struct policydb *oldp; | |
1329 | struct policydb *newp; | |
1330 | }; | |
1331 | ||
1332 | /* | |
1333 | * Convert the values in the security context | |
1334 | * structure `c' from the values specified | |
1335 | * in the policy `p->oldp' to the values specified | |
1336 | * in the policy `p->newp'. Verify that the | |
1337 | * context is valid under the new policy. | |
1338 | */ | |
1339 | static int convert_context(u32 key, | |
1340 | struct context *c, | |
1341 | void *p) | |
1342 | { | |
1343 | struct convert_context_args *args; | |
1344 | struct context oldc; | |
1345 | struct role_datum *role; | |
1346 | struct type_datum *typdatum; | |
1347 | struct user_datum *usrdatum; | |
1348 | char *s; | |
1349 | u32 len; | |
1350 | int rc; | |
1351 | ||
1352 | args = p; | |
1353 | ||
12b29f34 SS |
1354 | if (c->str) { |
1355 | struct context ctx; | |
9a59daa0 SS |
1356 | s = kstrdup(c->str, GFP_KERNEL); |
1357 | if (!s) { | |
1358 | rc = -ENOMEM; | |
1359 | goto out; | |
1360 | } | |
1361 | rc = string_to_context_struct(args->newp, NULL, s, | |
1362 | c->len, &ctx, SECSID_NULL); | |
1363 | kfree(s); | |
12b29f34 SS |
1364 | if (!rc) { |
1365 | printk(KERN_INFO | |
1366 | "SELinux: Context %s became valid (mapped).\n", | |
1367 | c->str); | |
1368 | /* Replace string with mapped representation. */ | |
1369 | kfree(c->str); | |
1370 | memcpy(c, &ctx, sizeof(*c)); | |
1371 | goto out; | |
1372 | } else if (rc == -EINVAL) { | |
1373 | /* Retain string representation for later mapping. */ | |
1374 | rc = 0; | |
1375 | goto out; | |
1376 | } else { | |
1377 | /* Other error condition, e.g. ENOMEM. */ | |
1378 | printk(KERN_ERR | |
1379 | "SELinux: Unable to map context %s, rc = %d.\n", | |
1380 | c->str, -rc); | |
1381 | goto out; | |
1382 | } | |
1383 | } | |
1384 | ||
1da177e4 LT |
1385 | rc = context_cpy(&oldc, c); |
1386 | if (rc) | |
1387 | goto out; | |
1388 | ||
1389 | rc = -EINVAL; | |
1390 | ||
1391 | /* Convert the user. */ | |
1392 | usrdatum = hashtab_search(args->newp->p_users.table, | |
5d55a345 EP |
1393 | args->oldp->p_user_val_to_name[c->user - 1]); |
1394 | if (!usrdatum) | |
1da177e4 | 1395 | goto bad; |
1da177e4 LT |
1396 | c->user = usrdatum->value; |
1397 | ||
1398 | /* Convert the role. */ | |
1399 | role = hashtab_search(args->newp->p_roles.table, | |
5d55a345 EP |
1400 | args->oldp->p_role_val_to_name[c->role - 1]); |
1401 | if (!role) | |
1da177e4 | 1402 | goto bad; |
1da177e4 LT |
1403 | c->role = role->value; |
1404 | ||
1405 | /* Convert the type. */ | |
1406 | typdatum = hashtab_search(args->newp->p_types.table, | |
5d55a345 EP |
1407 | args->oldp->p_type_val_to_name[c->type - 1]); |
1408 | if (!typdatum) | |
1da177e4 | 1409 | goto bad; |
1da177e4 LT |
1410 | c->type = typdatum->value; |
1411 | ||
1412 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1413 | if (rc) | |
1414 | goto bad; | |
1415 | ||
1416 | /* Check the validity of the new context. */ | |
1417 | if (!policydb_context_isvalid(args->newp, c)) { | |
1418 | rc = convert_context_handle_invalid_context(&oldc); | |
1419 | if (rc) | |
1420 | goto bad; | |
1421 | } | |
1422 | ||
1423 | context_destroy(&oldc); | |
12b29f34 | 1424 | rc = 0; |
1da177e4 LT |
1425 | out: |
1426 | return rc; | |
1427 | bad: | |
12b29f34 SS |
1428 | /* Map old representation to string and save it. */ |
1429 | if (context_struct_to_string(&oldc, &s, &len)) | |
1430 | return -ENOMEM; | |
1da177e4 | 1431 | context_destroy(&oldc); |
12b29f34 SS |
1432 | context_destroy(c); |
1433 | c->str = s; | |
1434 | c->len = len; | |
1435 | printk(KERN_INFO | |
1436 | "SELinux: Context %s became invalid (unmapped).\n", | |
1437 | c->str); | |
1438 | rc = 0; | |
1da177e4 LT |
1439 | goto out; |
1440 | } | |
1441 | ||
3bb56b25 PM |
1442 | static void security_load_policycaps(void) |
1443 | { | |
1444 | selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps, | |
1445 | POLICYDB_CAPABILITY_NETPEER); | |
b0c636b9 EP |
1446 | selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps, |
1447 | POLICYDB_CAPABILITY_OPENPERM); | |
3bb56b25 PM |
1448 | } |
1449 | ||
1da177e4 | 1450 | extern void selinux_complete_init(void); |
e900a7d9 | 1451 | static int security_preserve_bools(struct policydb *p); |
1da177e4 LT |
1452 | |
1453 | /** | |
1454 | * security_load_policy - Load a security policy configuration. | |
1455 | * @data: binary policy data | |
1456 | * @len: length of data in bytes | |
1457 | * | |
1458 | * Load a new set of security policy configuration data, | |
1459 | * validate it and convert the SID table as necessary. | |
1460 | * This function will flush the access vector cache after | |
1461 | * loading the new policy. | |
1462 | */ | |
1463 | int security_load_policy(void *data, size_t len) | |
1464 | { | |
1465 | struct policydb oldpolicydb, newpolicydb; | |
1466 | struct sidtab oldsidtab, newsidtab; | |
1467 | struct convert_context_args args; | |
1468 | u32 seqno; | |
1469 | int rc = 0; | |
1470 | struct policy_file file = { data, len }, *fp = &file; | |
1471 | ||
1da177e4 LT |
1472 | if (!ss_initialized) { |
1473 | avtab_cache_init(); | |
1474 | if (policydb_read(&policydb, fp)) { | |
1da177e4 LT |
1475 | avtab_cache_destroy(); |
1476 | return -EINVAL; | |
1477 | } | |
1478 | if (policydb_load_isids(&policydb, &sidtab)) { | |
1da177e4 LT |
1479 | policydb_destroy(&policydb); |
1480 | avtab_cache_destroy(); | |
1481 | return -EINVAL; | |
1482 | } | |
b94c7e67 CS |
1483 | /* Verify that the kernel defined classes are correct. */ |
1484 | if (validate_classes(&policydb)) { | |
1485 | printk(KERN_ERR | |
454d972c | 1486 | "SELinux: the definition of a class is incorrect\n"); |
b94c7e67 CS |
1487 | sidtab_destroy(&sidtab); |
1488 | policydb_destroy(&policydb); | |
1489 | avtab_cache_destroy(); | |
1490 | return -EINVAL; | |
1491 | } | |
3bb56b25 | 1492 | security_load_policycaps(); |
1da177e4 LT |
1493 | policydb_loaded_version = policydb.policyvers; |
1494 | ss_initialized = 1; | |
4c443d1b | 1495 | seqno = ++latest_granting; |
1da177e4 | 1496 | selinux_complete_init(); |
4c443d1b SS |
1497 | avc_ss_reset(seqno); |
1498 | selnl_notify_policyload(seqno); | |
7420ed23 | 1499 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1500 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1501 | return 0; |
1502 | } | |
1503 | ||
1504 | #if 0 | |
1505 | sidtab_hash_eval(&sidtab, "sids"); | |
1506 | #endif | |
1507 | ||
89abd0ac | 1508 | if (policydb_read(&newpolicydb, fp)) |
1da177e4 | 1509 | return -EINVAL; |
1da177e4 | 1510 | |
12b29f34 | 1511 | if (sidtab_init(&newsidtab)) { |
12b29f34 SS |
1512 | policydb_destroy(&newpolicydb); |
1513 | return -ENOMEM; | |
1514 | } | |
1da177e4 | 1515 | |
b94c7e67 CS |
1516 | /* Verify that the kernel defined classes are correct. */ |
1517 | if (validate_classes(&newpolicydb)) { | |
1518 | printk(KERN_ERR | |
454d972c | 1519 | "SELinux: the definition of a class is incorrect\n"); |
b94c7e67 CS |
1520 | rc = -EINVAL; |
1521 | goto err; | |
1522 | } | |
1523 | ||
e900a7d9 SS |
1524 | rc = security_preserve_bools(&newpolicydb); |
1525 | if (rc) { | |
454d972c | 1526 | printk(KERN_ERR "SELinux: unable to preserve booleans\n"); |
e900a7d9 SS |
1527 | goto err; |
1528 | } | |
1529 | ||
1da177e4 LT |
1530 | /* Clone the SID table. */ |
1531 | sidtab_shutdown(&sidtab); | |
1532 | if (sidtab_map(&sidtab, clone_sid, &newsidtab)) { | |
1533 | rc = -ENOMEM; | |
1534 | goto err; | |
1535 | } | |
1536 | ||
12b29f34 SS |
1537 | /* |
1538 | * Convert the internal representations of contexts | |
1539 | * in the new SID table. | |
1540 | */ | |
1da177e4 LT |
1541 | args.oldp = &policydb; |
1542 | args.newp = &newpolicydb; | |
12b29f34 SS |
1543 | rc = sidtab_map(&newsidtab, convert_context, &args); |
1544 | if (rc) | |
1545 | goto err; | |
1da177e4 LT |
1546 | |
1547 | /* Save the old policydb and SID table to free later. */ | |
1548 | memcpy(&oldpolicydb, &policydb, sizeof policydb); | |
1549 | sidtab_set(&oldsidtab, &sidtab); | |
1550 | ||
1551 | /* Install the new policydb and SID table. */ | |
0804d113 | 1552 | write_lock_irq(&policy_rwlock); |
1da177e4 LT |
1553 | memcpy(&policydb, &newpolicydb, sizeof policydb); |
1554 | sidtab_set(&sidtab, &newsidtab); | |
3bb56b25 | 1555 | security_load_policycaps(); |
1da177e4 LT |
1556 | seqno = ++latest_granting; |
1557 | policydb_loaded_version = policydb.policyvers; | |
0804d113 | 1558 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
1559 | |
1560 | /* Free the old policydb and SID table. */ | |
1561 | policydb_destroy(&oldpolicydb); | |
1562 | sidtab_destroy(&oldsidtab); | |
1563 | ||
1564 | avc_ss_reset(seqno); | |
1565 | selnl_notify_policyload(seqno); | |
7420ed23 | 1566 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1567 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1568 | |
1569 | return 0; | |
1570 | ||
1571 | err: | |
1da177e4 LT |
1572 | sidtab_destroy(&newsidtab); |
1573 | policydb_destroy(&newpolicydb); | |
1574 | return rc; | |
1575 | ||
1576 | } | |
1577 | ||
1578 | /** | |
1579 | * security_port_sid - Obtain the SID for a port. | |
1da177e4 LT |
1580 | * @protocol: protocol number |
1581 | * @port: port number | |
1582 | * @out_sid: security identifier | |
1583 | */ | |
3e112172 | 1584 | int security_port_sid(u8 protocol, u16 port, u32 *out_sid) |
1da177e4 LT |
1585 | { |
1586 | struct ocontext *c; | |
1587 | int rc = 0; | |
1588 | ||
0804d113 | 1589 | read_lock(&policy_rwlock); |
1da177e4 LT |
1590 | |
1591 | c = policydb.ocontexts[OCON_PORT]; | |
1592 | while (c) { | |
1593 | if (c->u.port.protocol == protocol && | |
1594 | c->u.port.low_port <= port && | |
1595 | c->u.port.high_port >= port) | |
1596 | break; | |
1597 | c = c->next; | |
1598 | } | |
1599 | ||
1600 | if (c) { | |
1601 | if (!c->sid[0]) { | |
1602 | rc = sidtab_context_to_sid(&sidtab, | |
1603 | &c->context[0], | |
1604 | &c->sid[0]); | |
1605 | if (rc) | |
1606 | goto out; | |
1607 | } | |
1608 | *out_sid = c->sid[0]; | |
1609 | } else { | |
1610 | *out_sid = SECINITSID_PORT; | |
1611 | } | |
1612 | ||
1613 | out: | |
0804d113 | 1614 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1615 | return rc; |
1616 | } | |
1617 | ||
1618 | /** | |
1619 | * security_netif_sid - Obtain the SID for a network interface. | |
1620 | * @name: interface name | |
1621 | * @if_sid: interface SID | |
1da177e4 | 1622 | */ |
e8bfdb9d | 1623 | int security_netif_sid(char *name, u32 *if_sid) |
1da177e4 LT |
1624 | { |
1625 | int rc = 0; | |
1626 | struct ocontext *c; | |
1627 | ||
0804d113 | 1628 | read_lock(&policy_rwlock); |
1da177e4 LT |
1629 | |
1630 | c = policydb.ocontexts[OCON_NETIF]; | |
1631 | while (c) { | |
1632 | if (strcmp(name, c->u.name) == 0) | |
1633 | break; | |
1634 | c = c->next; | |
1635 | } | |
1636 | ||
1637 | if (c) { | |
1638 | if (!c->sid[0] || !c->sid[1]) { | |
1639 | rc = sidtab_context_to_sid(&sidtab, | |
1640 | &c->context[0], | |
1641 | &c->sid[0]); | |
1642 | if (rc) | |
1643 | goto out; | |
1644 | rc = sidtab_context_to_sid(&sidtab, | |
1645 | &c->context[1], | |
1646 | &c->sid[1]); | |
1647 | if (rc) | |
1648 | goto out; | |
1649 | } | |
1650 | *if_sid = c->sid[0]; | |
e8bfdb9d | 1651 | } else |
1da177e4 | 1652 | *if_sid = SECINITSID_NETIF; |
1da177e4 LT |
1653 | |
1654 | out: | |
0804d113 | 1655 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1656 | return rc; |
1657 | } | |
1658 | ||
1659 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
1660 | { | |
1661 | int i, fail = 0; | |
1662 | ||
5d55a345 EP |
1663 | for (i = 0; i < 4; i++) |
1664 | if (addr[i] != (input[i] & mask[i])) { | |
1da177e4 LT |
1665 | fail = 1; |
1666 | break; | |
1667 | } | |
1668 | ||
1669 | return !fail; | |
1670 | } | |
1671 | ||
1672 | /** | |
1673 | * security_node_sid - Obtain the SID for a node (host). | |
1674 | * @domain: communication domain aka address family | |
1675 | * @addrp: address | |
1676 | * @addrlen: address length in bytes | |
1677 | * @out_sid: security identifier | |
1678 | */ | |
1679 | int security_node_sid(u16 domain, | |
1680 | void *addrp, | |
1681 | u32 addrlen, | |
1682 | u32 *out_sid) | |
1683 | { | |
1684 | int rc = 0; | |
1685 | struct ocontext *c; | |
1686 | ||
0804d113 | 1687 | read_lock(&policy_rwlock); |
1da177e4 LT |
1688 | |
1689 | switch (domain) { | |
1690 | case AF_INET: { | |
1691 | u32 addr; | |
1692 | ||
1693 | if (addrlen != sizeof(u32)) { | |
1694 | rc = -EINVAL; | |
1695 | goto out; | |
1696 | } | |
1697 | ||
1698 | addr = *((u32 *)addrp); | |
1699 | ||
1700 | c = policydb.ocontexts[OCON_NODE]; | |
1701 | while (c) { | |
1702 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
1703 | break; | |
1704 | c = c->next; | |
1705 | } | |
1706 | break; | |
1707 | } | |
1708 | ||
1709 | case AF_INET6: | |
1710 | if (addrlen != sizeof(u64) * 2) { | |
1711 | rc = -EINVAL; | |
1712 | goto out; | |
1713 | } | |
1714 | c = policydb.ocontexts[OCON_NODE6]; | |
1715 | while (c) { | |
1716 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
1717 | c->u.node6.mask)) | |
1718 | break; | |
1719 | c = c->next; | |
1720 | } | |
1721 | break; | |
1722 | ||
1723 | default: | |
1724 | *out_sid = SECINITSID_NODE; | |
1725 | goto out; | |
1726 | } | |
1727 | ||
1728 | if (c) { | |
1729 | if (!c->sid[0]) { | |
1730 | rc = sidtab_context_to_sid(&sidtab, | |
1731 | &c->context[0], | |
1732 | &c->sid[0]); | |
1733 | if (rc) | |
1734 | goto out; | |
1735 | } | |
1736 | *out_sid = c->sid[0]; | |
1737 | } else { | |
1738 | *out_sid = SECINITSID_NODE; | |
1739 | } | |
1740 | ||
1741 | out: | |
0804d113 | 1742 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1743 | return rc; |
1744 | } | |
1745 | ||
1746 | #define SIDS_NEL 25 | |
1747 | ||
1748 | /** | |
1749 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
1750 | * @fromsid: starting SID | |
1751 | * @username: username | |
1752 | * @sids: array of reachable SIDs for user | |
1753 | * @nel: number of elements in @sids | |
1754 | * | |
1755 | * Generate the set of SIDs for legal security contexts | |
1756 | * for a given user that can be reached by @fromsid. | |
1757 | * Set *@sids to point to a dynamically allocated | |
1758 | * array containing the set of SIDs. Set *@nel to the | |
1759 | * number of elements in the array. | |
1760 | */ | |
1761 | ||
1762 | int security_get_user_sids(u32 fromsid, | |
5d55a345 | 1763 | char *username, |
1da177e4 LT |
1764 | u32 **sids, |
1765 | u32 *nel) | |
1766 | { | |
1767 | struct context *fromcon, usercon; | |
2c3c05db | 1768 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
1769 | u32 mynel = 0, maxnel = SIDS_NEL; |
1770 | struct user_datum *user; | |
1771 | struct role_datum *role; | |
782ebb99 | 1772 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
1773 | int rc = 0, i, j; |
1774 | ||
2c3c05db SS |
1775 | *sids = NULL; |
1776 | *nel = 0; | |
1777 | ||
1778 | if (!ss_initialized) | |
1da177e4 | 1779 | goto out; |
1da177e4 | 1780 | |
0804d113 | 1781 | read_lock(&policy_rwlock); |
1da177e4 | 1782 | |
12b29f34 SS |
1783 | context_init(&usercon); |
1784 | ||
1da177e4 LT |
1785 | fromcon = sidtab_search(&sidtab, fromsid); |
1786 | if (!fromcon) { | |
1787 | rc = -EINVAL; | |
1788 | goto out_unlock; | |
1789 | } | |
1790 | ||
1791 | user = hashtab_search(policydb.p_users.table, username); | |
1792 | if (!user) { | |
1793 | rc = -EINVAL; | |
1794 | goto out_unlock; | |
1795 | } | |
1796 | usercon.user = user->value; | |
1797 | ||
89d155ef | 1798 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
1da177e4 LT |
1799 | if (!mysids) { |
1800 | rc = -ENOMEM; | |
1801 | goto out_unlock; | |
1802 | } | |
1da177e4 | 1803 | |
9fe79ad1 | 1804 | ebitmap_for_each_positive_bit(&user->roles, rnode, i) { |
1da177e4 LT |
1805 | role = policydb.role_val_to_struct[i]; |
1806 | usercon.role = i+1; | |
9fe79ad1 | 1807 | ebitmap_for_each_positive_bit(&role->types, tnode, j) { |
1da177e4 LT |
1808 | usercon.type = j+1; |
1809 | ||
1810 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
1811 | continue; | |
1812 | ||
1da177e4 | 1813 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
2c3c05db | 1814 | if (rc) |
1da177e4 | 1815 | goto out_unlock; |
1da177e4 LT |
1816 | if (mynel < maxnel) { |
1817 | mysids[mynel++] = sid; | |
1818 | } else { | |
1819 | maxnel += SIDS_NEL; | |
89d155ef | 1820 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
1da177e4 LT |
1821 | if (!mysids2) { |
1822 | rc = -ENOMEM; | |
1da177e4 LT |
1823 | goto out_unlock; |
1824 | } | |
1da177e4 LT |
1825 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
1826 | kfree(mysids); | |
1827 | mysids = mysids2; | |
1828 | mysids[mynel++] = sid; | |
1829 | } | |
1830 | } | |
1831 | } | |
1832 | ||
1da177e4 | 1833 | out_unlock: |
0804d113 | 1834 | read_unlock(&policy_rwlock); |
2c3c05db SS |
1835 | if (rc || !mynel) { |
1836 | kfree(mysids); | |
1837 | goto out; | |
1838 | } | |
1839 | ||
1840 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); | |
1841 | if (!mysids2) { | |
1842 | rc = -ENOMEM; | |
1843 | kfree(mysids); | |
1844 | goto out; | |
1845 | } | |
1846 | for (i = 0, j = 0; i < mynel; i++) { | |
1847 | rc = avc_has_perm_noaudit(fromsid, mysids[i], | |
1848 | SECCLASS_PROCESS, | |
1849 | PROCESS__TRANSITION, AVC_STRICT, | |
1850 | NULL); | |
1851 | if (!rc) | |
1852 | mysids2[j++] = mysids[i]; | |
1853 | cond_resched(); | |
1854 | } | |
1855 | rc = 0; | |
1856 | kfree(mysids); | |
1857 | *sids = mysids2; | |
1858 | *nel = j; | |
1da177e4 LT |
1859 | out: |
1860 | return rc; | |
1861 | } | |
1862 | ||
1863 | /** | |
1864 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
1865 | * @fstype: filesystem type | |
1866 | * @path: path from root of mount | |
1867 | * @sclass: file security class | |
1868 | * @sid: SID for path | |
1869 | * | |
1870 | * Obtain a SID to use for a file in a filesystem that | |
1871 | * cannot support xattr or use a fixed labeling behavior like | |
1872 | * transition SIDs or task SIDs. | |
1873 | */ | |
1874 | int security_genfs_sid(const char *fstype, | |
5d55a345 | 1875 | char *path, |
1da177e4 LT |
1876 | u16 sclass, |
1877 | u32 *sid) | |
1878 | { | |
1879 | int len; | |
1880 | struct genfs *genfs; | |
1881 | struct ocontext *c; | |
1882 | int rc = 0, cmp = 0; | |
1883 | ||
b1aa5301 SS |
1884 | while (path[0] == '/' && path[1] == '/') |
1885 | path++; | |
1886 | ||
0804d113 | 1887 | read_lock(&policy_rwlock); |
1da177e4 LT |
1888 | |
1889 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { | |
1890 | cmp = strcmp(fstype, genfs->fstype); | |
1891 | if (cmp <= 0) | |
1892 | break; | |
1893 | } | |
1894 | ||
1895 | if (!genfs || cmp) { | |
1896 | *sid = SECINITSID_UNLABELED; | |
1897 | rc = -ENOENT; | |
1898 | goto out; | |
1899 | } | |
1900 | ||
1901 | for (c = genfs->head; c; c = c->next) { | |
1902 | len = strlen(c->u.name); | |
1903 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
1904 | (strncmp(c->u.name, path, len) == 0)) | |
1905 | break; | |
1906 | } | |
1907 | ||
1908 | if (!c) { | |
1909 | *sid = SECINITSID_UNLABELED; | |
1910 | rc = -ENOENT; | |
1911 | goto out; | |
1912 | } | |
1913 | ||
1914 | if (!c->sid[0]) { | |
1915 | rc = sidtab_context_to_sid(&sidtab, | |
1916 | &c->context[0], | |
1917 | &c->sid[0]); | |
1918 | if (rc) | |
1919 | goto out; | |
1920 | } | |
1921 | ||
1922 | *sid = c->sid[0]; | |
1923 | out: | |
0804d113 | 1924 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1925 | return rc; |
1926 | } | |
1927 | ||
1928 | /** | |
1929 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
1930 | * @fstype: filesystem type | |
1931 | * @behavior: labeling behavior | |
1932 | * @sid: SID for filesystem (superblock) | |
1933 | */ | |
1934 | int security_fs_use( | |
1935 | const char *fstype, | |
1936 | unsigned int *behavior, | |
089be43e | 1937 | u32 *sid) |
1da177e4 LT |
1938 | { |
1939 | int rc = 0; | |
1940 | struct ocontext *c; | |
1941 | ||
0804d113 | 1942 | read_lock(&policy_rwlock); |
1da177e4 LT |
1943 | |
1944 | c = policydb.ocontexts[OCON_FSUSE]; | |
1945 | while (c) { | |
1946 | if (strcmp(fstype, c->u.name) == 0) | |
1947 | break; | |
1948 | c = c->next; | |
1949 | } | |
1950 | ||
1951 | if (c) { | |
1952 | *behavior = c->v.behavior; | |
1953 | if (!c->sid[0]) { | |
1954 | rc = sidtab_context_to_sid(&sidtab, | |
1955 | &c->context[0], | |
1956 | &c->sid[0]); | |
1957 | if (rc) | |
1958 | goto out; | |
1959 | } | |
1960 | *sid = c->sid[0]; | |
1961 | } else { | |
089be43e JM |
1962 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); |
1963 | if (rc) { | |
1964 | *behavior = SECURITY_FS_USE_NONE; | |
1965 | rc = 0; | |
1966 | } else { | |
1967 | *behavior = SECURITY_FS_USE_GENFS; | |
1968 | } | |
1da177e4 LT |
1969 | } |
1970 | ||
1971 | out: | |
0804d113 | 1972 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1973 | return rc; |
1974 | } | |
1975 | ||
1976 | int security_get_bools(int *len, char ***names, int **values) | |
1977 | { | |
1978 | int i, rc = -ENOMEM; | |
1979 | ||
0804d113 | 1980 | read_lock(&policy_rwlock); |
1da177e4 LT |
1981 | *names = NULL; |
1982 | *values = NULL; | |
1983 | ||
1984 | *len = policydb.p_bools.nprim; | |
1985 | if (!*len) { | |
1986 | rc = 0; | |
1987 | goto out; | |
1988 | } | |
1989 | ||
5d55a345 | 1990 | *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); |
1da177e4 LT |
1991 | if (!*names) |
1992 | goto err; | |
1da177e4 | 1993 | |
e0795cf4 | 1994 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); |
1da177e4 LT |
1995 | if (!*values) |
1996 | goto err; | |
1997 | ||
1998 | for (i = 0; i < *len; i++) { | |
1999 | size_t name_len; | |
2000 | (*values)[i] = policydb.bool_val_to_struct[i]->state; | |
2001 | name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; | |
5d55a345 | 2002 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); |
1da177e4 LT |
2003 | if (!(*names)[i]) |
2004 | goto err; | |
2005 | strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); | |
2006 | (*names)[i][name_len - 1] = 0; | |
2007 | } | |
2008 | rc = 0; | |
2009 | out: | |
0804d113 | 2010 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2011 | return rc; |
2012 | err: | |
2013 | if (*names) { | |
2014 | for (i = 0; i < *len; i++) | |
9a5f04bf | 2015 | kfree((*names)[i]); |
1da177e4 | 2016 | } |
9a5f04bf | 2017 | kfree(*values); |
1da177e4 LT |
2018 | goto out; |
2019 | } | |
2020 | ||
2021 | ||
2022 | int security_set_bools(int len, int *values) | |
2023 | { | |
2024 | int i, rc = 0; | |
2025 | int lenp, seqno = 0; | |
2026 | struct cond_node *cur; | |
2027 | ||
0804d113 | 2028 | write_lock_irq(&policy_rwlock); |
1da177e4 LT |
2029 | |
2030 | lenp = policydb.p_bools.nprim; | |
2031 | if (len != lenp) { | |
2032 | rc = -EFAULT; | |
2033 | goto out; | |
2034 | } | |
2035 | ||
1da177e4 | 2036 | for (i = 0; i < len; i++) { |
af601e46 SG |
2037 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
2038 | audit_log(current->audit_context, GFP_ATOMIC, | |
2039 | AUDIT_MAC_CONFIG_CHANGE, | |
4746ec5b | 2040 | "bool=%s val=%d old_val=%d auid=%u ses=%u", |
af601e46 SG |
2041 | policydb.p_bool_val_to_name[i], |
2042 | !!values[i], | |
2043 | policydb.bool_val_to_struct[i]->state, | |
4746ec5b EP |
2044 | audit_get_loginuid(current), |
2045 | audit_get_sessionid(current)); | |
af601e46 | 2046 | } |
5d55a345 | 2047 | if (values[i]) |
1da177e4 | 2048 | policydb.bool_val_to_struct[i]->state = 1; |
5d55a345 | 2049 | else |
1da177e4 | 2050 | policydb.bool_val_to_struct[i]->state = 0; |
1da177e4 | 2051 | } |
1da177e4 LT |
2052 | |
2053 | for (cur = policydb.cond_list; cur != NULL; cur = cur->next) { | |
2054 | rc = evaluate_cond_node(&policydb, cur); | |
2055 | if (rc) | |
2056 | goto out; | |
2057 | } | |
2058 | ||
2059 | seqno = ++latest_granting; | |
2060 | ||
2061 | out: | |
0804d113 | 2062 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
2063 | if (!rc) { |
2064 | avc_ss_reset(seqno); | |
2065 | selnl_notify_policyload(seqno); | |
342a0cff | 2066 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
2067 | } |
2068 | return rc; | |
2069 | } | |
2070 | ||
2071 | int security_get_bool_value(int bool) | |
2072 | { | |
2073 | int rc = 0; | |
2074 | int len; | |
2075 | ||
0804d113 | 2076 | read_lock(&policy_rwlock); |
1da177e4 LT |
2077 | |
2078 | len = policydb.p_bools.nprim; | |
2079 | if (bool >= len) { | |
2080 | rc = -EFAULT; | |
2081 | goto out; | |
2082 | } | |
2083 | ||
2084 | rc = policydb.bool_val_to_struct[bool]->state; | |
2085 | out: | |
0804d113 | 2086 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2087 | return rc; |
2088 | } | |
376bd9cb | 2089 | |
e900a7d9 SS |
2090 | static int security_preserve_bools(struct policydb *p) |
2091 | { | |
2092 | int rc, nbools = 0, *bvalues = NULL, i; | |
2093 | char **bnames = NULL; | |
2094 | struct cond_bool_datum *booldatum; | |
2095 | struct cond_node *cur; | |
2096 | ||
2097 | rc = security_get_bools(&nbools, &bnames, &bvalues); | |
2098 | if (rc) | |
2099 | goto out; | |
2100 | for (i = 0; i < nbools; i++) { | |
2101 | booldatum = hashtab_search(p->p_bools.table, bnames[i]); | |
2102 | if (booldatum) | |
2103 | booldatum->state = bvalues[i]; | |
2104 | } | |
2105 | for (cur = p->cond_list; cur != NULL; cur = cur->next) { | |
2106 | rc = evaluate_cond_node(p, cur); | |
2107 | if (rc) | |
2108 | goto out; | |
2109 | } | |
2110 | ||
2111 | out: | |
2112 | if (bnames) { | |
2113 | for (i = 0; i < nbools; i++) | |
2114 | kfree(bnames[i]); | |
2115 | } | |
2116 | kfree(bnames); | |
2117 | kfree(bvalues); | |
2118 | return rc; | |
2119 | } | |
2120 | ||
08554d6b VY |
2121 | /* |
2122 | * security_sid_mls_copy() - computes a new sid based on the given | |
2123 | * sid and the mls portion of mls_sid. | |
2124 | */ | |
2125 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
2126 | { | |
2127 | struct context *context1; | |
2128 | struct context *context2; | |
2129 | struct context newcon; | |
2130 | char *s; | |
2131 | u32 len; | |
2132 | int rc = 0; | |
2133 | ||
4eb327b5 | 2134 | if (!ss_initialized || !selinux_mls_enabled) { |
08554d6b VY |
2135 | *new_sid = sid; |
2136 | goto out; | |
2137 | } | |
2138 | ||
2139 | context_init(&newcon); | |
2140 | ||
0804d113 | 2141 | read_lock(&policy_rwlock); |
08554d6b VY |
2142 | context1 = sidtab_search(&sidtab, sid); |
2143 | if (!context1) { | |
744ba35e EP |
2144 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2145 | __func__, sid); | |
08554d6b VY |
2146 | rc = -EINVAL; |
2147 | goto out_unlock; | |
2148 | } | |
2149 | ||
2150 | context2 = sidtab_search(&sidtab, mls_sid); | |
2151 | if (!context2) { | |
744ba35e EP |
2152 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2153 | __func__, mls_sid); | |
08554d6b VY |
2154 | rc = -EINVAL; |
2155 | goto out_unlock; | |
2156 | } | |
2157 | ||
2158 | newcon.user = context1->user; | |
2159 | newcon.role = context1->role; | |
2160 | newcon.type = context1->type; | |
0efc61ea | 2161 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
2162 | if (rc) |
2163 | goto out_unlock; | |
2164 | ||
08554d6b VY |
2165 | /* Check the validity of the new context. */ |
2166 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
2167 | rc = convert_context_handle_invalid_context(&newcon); | |
2168 | if (rc) | |
2169 | goto bad; | |
2170 | } | |
2171 | ||
2172 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
2173 | goto out_unlock; | |
2174 | ||
2175 | bad: | |
2176 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
2177 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2178 | "security_sid_mls_copy: invalid context %s", s); | |
2179 | kfree(s); | |
2180 | } | |
2181 | ||
2182 | out_unlock: | |
0804d113 | 2183 | read_unlock(&policy_rwlock); |
08554d6b VY |
2184 | context_destroy(&newcon); |
2185 | out: | |
2186 | return rc; | |
2187 | } | |
2188 | ||
220deb96 PM |
2189 | /** |
2190 | * security_net_peersid_resolve - Compare and resolve two network peer SIDs | |
2191 | * @nlbl_sid: NetLabel SID | |
2192 | * @nlbl_type: NetLabel labeling protocol type | |
2193 | * @xfrm_sid: XFRM SID | |
2194 | * | |
2195 | * Description: | |
2196 | * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be | |
2197 | * resolved into a single SID it is returned via @peer_sid and the function | |
2198 | * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function | |
2199 | * returns a negative value. A table summarizing the behavior is below: | |
2200 | * | |
2201 | * | function return | @sid | |
2202 | * ------------------------------+-----------------+----------------- | |
2203 | * no peer labels | 0 | SECSID_NULL | |
2204 | * single peer label | 0 | <peer_label> | |
2205 | * multiple, consistent labels | 0 | <peer_label> | |
2206 | * multiple, inconsistent labels | -<errno> | SECSID_NULL | |
2207 | * | |
2208 | */ | |
2209 | int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, | |
2210 | u32 xfrm_sid, | |
2211 | u32 *peer_sid) | |
2212 | { | |
2213 | int rc; | |
2214 | struct context *nlbl_ctx; | |
2215 | struct context *xfrm_ctx; | |
2216 | ||
2217 | /* handle the common (which also happens to be the set of easy) cases | |
2218 | * right away, these two if statements catch everything involving a | |
2219 | * single or absent peer SID/label */ | |
2220 | if (xfrm_sid == SECSID_NULL) { | |
2221 | *peer_sid = nlbl_sid; | |
2222 | return 0; | |
2223 | } | |
2224 | /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label | |
2225 | * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label | |
2226 | * is present */ | |
2227 | if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { | |
2228 | *peer_sid = xfrm_sid; | |
2229 | return 0; | |
2230 | } | |
2231 | ||
2232 | /* we don't need to check ss_initialized here since the only way both | |
2233 | * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the | |
2234 | * security server was initialized and ss_initialized was true */ | |
2235 | if (!selinux_mls_enabled) { | |
2236 | *peer_sid = SECSID_NULL; | |
2237 | return 0; | |
2238 | } | |
2239 | ||
0804d113 | 2240 | read_lock(&policy_rwlock); |
220deb96 PM |
2241 | |
2242 | nlbl_ctx = sidtab_search(&sidtab, nlbl_sid); | |
2243 | if (!nlbl_ctx) { | |
744ba35e EP |
2244 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2245 | __func__, nlbl_sid); | |
220deb96 PM |
2246 | rc = -EINVAL; |
2247 | goto out_slowpath; | |
2248 | } | |
2249 | xfrm_ctx = sidtab_search(&sidtab, xfrm_sid); | |
2250 | if (!xfrm_ctx) { | |
744ba35e EP |
2251 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2252 | __func__, xfrm_sid); | |
220deb96 PM |
2253 | rc = -EINVAL; |
2254 | goto out_slowpath; | |
2255 | } | |
2256 | rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); | |
2257 | ||
2258 | out_slowpath: | |
0804d113 | 2259 | read_unlock(&policy_rwlock); |
220deb96 PM |
2260 | if (rc == 0) |
2261 | /* at present NetLabel SIDs/labels really only carry MLS | |
2262 | * information so if the MLS portion of the NetLabel SID | |
2263 | * matches the MLS portion of the labeled XFRM SID/label | |
2264 | * then pass along the XFRM SID as it is the most | |
2265 | * expressive */ | |
2266 | *peer_sid = xfrm_sid; | |
2267 | else | |
2268 | *peer_sid = SECSID_NULL; | |
2269 | return rc; | |
2270 | } | |
2271 | ||
55fcf09b CP |
2272 | static int get_classes_callback(void *k, void *d, void *args) |
2273 | { | |
2274 | struct class_datum *datum = d; | |
2275 | char *name = k, **classes = args; | |
2276 | int value = datum->value - 1; | |
2277 | ||
2278 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
2279 | if (!classes[value]) | |
2280 | return -ENOMEM; | |
2281 | ||
2282 | return 0; | |
2283 | } | |
2284 | ||
2285 | int security_get_classes(char ***classes, int *nclasses) | |
2286 | { | |
2287 | int rc = -ENOMEM; | |
2288 | ||
0804d113 | 2289 | read_lock(&policy_rwlock); |
55fcf09b CP |
2290 | |
2291 | *nclasses = policydb.p_classes.nprim; | |
2292 | *classes = kcalloc(*nclasses, sizeof(*classes), GFP_ATOMIC); | |
2293 | if (!*classes) | |
2294 | goto out; | |
2295 | ||
2296 | rc = hashtab_map(policydb.p_classes.table, get_classes_callback, | |
2297 | *classes); | |
2298 | if (rc < 0) { | |
2299 | int i; | |
2300 | for (i = 0; i < *nclasses; i++) | |
2301 | kfree((*classes)[i]); | |
2302 | kfree(*classes); | |
2303 | } | |
2304 | ||
2305 | out: | |
0804d113 | 2306 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2307 | return rc; |
2308 | } | |
2309 | ||
2310 | static int get_permissions_callback(void *k, void *d, void *args) | |
2311 | { | |
2312 | struct perm_datum *datum = d; | |
2313 | char *name = k, **perms = args; | |
2314 | int value = datum->value - 1; | |
2315 | ||
2316 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
2317 | if (!perms[value]) | |
2318 | return -ENOMEM; | |
2319 | ||
2320 | return 0; | |
2321 | } | |
2322 | ||
2323 | int security_get_permissions(char *class, char ***perms, int *nperms) | |
2324 | { | |
2325 | int rc = -ENOMEM, i; | |
2326 | struct class_datum *match; | |
2327 | ||
0804d113 | 2328 | read_lock(&policy_rwlock); |
55fcf09b CP |
2329 | |
2330 | match = hashtab_search(policydb.p_classes.table, class); | |
2331 | if (!match) { | |
744ba35e | 2332 | printk(KERN_ERR "SELinux: %s: unrecognized class %s\n", |
dd6f953a | 2333 | __func__, class); |
55fcf09b CP |
2334 | rc = -EINVAL; |
2335 | goto out; | |
2336 | } | |
2337 | ||
2338 | *nperms = match->permissions.nprim; | |
2339 | *perms = kcalloc(*nperms, sizeof(*perms), GFP_ATOMIC); | |
2340 | if (!*perms) | |
2341 | goto out; | |
2342 | ||
2343 | if (match->comdatum) { | |
2344 | rc = hashtab_map(match->comdatum->permissions.table, | |
2345 | get_permissions_callback, *perms); | |
2346 | if (rc < 0) | |
2347 | goto err; | |
2348 | } | |
2349 | ||
2350 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
2351 | *perms); | |
2352 | if (rc < 0) | |
2353 | goto err; | |
2354 | ||
2355 | out: | |
0804d113 | 2356 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2357 | return rc; |
2358 | ||
2359 | err: | |
0804d113 | 2360 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2361 | for (i = 0; i < *nperms; i++) |
2362 | kfree((*perms)[i]); | |
2363 | kfree(*perms); | |
2364 | return rc; | |
2365 | } | |
2366 | ||
3f12070e EP |
2367 | int security_get_reject_unknown(void) |
2368 | { | |
2369 | return policydb.reject_unknown; | |
2370 | } | |
2371 | ||
2372 | int security_get_allow_unknown(void) | |
2373 | { | |
2374 | return policydb.allow_unknown; | |
2375 | } | |
2376 | ||
3bb56b25 PM |
2377 | /** |
2378 | * security_policycap_supported - Check for a specific policy capability | |
2379 | * @req_cap: capability | |
2380 | * | |
2381 | * Description: | |
2382 | * This function queries the currently loaded policy to see if it supports the | |
2383 | * capability specified by @req_cap. Returns true (1) if the capability is | |
2384 | * supported, false (0) if it isn't supported. | |
2385 | * | |
2386 | */ | |
2387 | int security_policycap_supported(unsigned int req_cap) | |
2388 | { | |
2389 | int rc; | |
2390 | ||
0804d113 | 2391 | read_lock(&policy_rwlock); |
3bb56b25 | 2392 | rc = ebitmap_get_bit(&policydb.policycaps, req_cap); |
0804d113 | 2393 | read_unlock(&policy_rwlock); |
3bb56b25 PM |
2394 | |
2395 | return rc; | |
2396 | } | |
2397 | ||
376bd9cb DG |
2398 | struct selinux_audit_rule { |
2399 | u32 au_seqno; | |
2400 | struct context au_ctxt; | |
2401 | }; | |
2402 | ||
9d57a7f9 | 2403 | void selinux_audit_rule_free(void *vrule) |
376bd9cb | 2404 | { |
9d57a7f9 AD |
2405 | struct selinux_audit_rule *rule = vrule; |
2406 | ||
376bd9cb DG |
2407 | if (rule) { |
2408 | context_destroy(&rule->au_ctxt); | |
2409 | kfree(rule); | |
2410 | } | |
2411 | } | |
2412 | ||
9d57a7f9 | 2413 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) |
376bd9cb DG |
2414 | { |
2415 | struct selinux_audit_rule *tmprule; | |
2416 | struct role_datum *roledatum; | |
2417 | struct type_datum *typedatum; | |
2418 | struct user_datum *userdatum; | |
9d57a7f9 | 2419 | struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule; |
376bd9cb DG |
2420 | int rc = 0; |
2421 | ||
2422 | *rule = NULL; | |
2423 | ||
2424 | if (!ss_initialized) | |
3ad40d64 | 2425 | return -EOPNOTSUPP; |
376bd9cb DG |
2426 | |
2427 | switch (field) { | |
3a6b9f85 DG |
2428 | case AUDIT_SUBJ_USER: |
2429 | case AUDIT_SUBJ_ROLE: | |
2430 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
2431 | case AUDIT_OBJ_USER: |
2432 | case AUDIT_OBJ_ROLE: | |
2433 | case AUDIT_OBJ_TYPE: | |
376bd9cb DG |
2434 | /* only 'equals' and 'not equals' fit user, role, and type */ |
2435 | if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL) | |
2436 | return -EINVAL; | |
2437 | break; | |
3a6b9f85 DG |
2438 | case AUDIT_SUBJ_SEN: |
2439 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2440 | case AUDIT_OBJ_LEV_LOW: |
2441 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2442 | /* we do not allow a range, indicated by the presense of '-' */ |
2443 | if (strchr(rulestr, '-')) | |
2444 | return -EINVAL; | |
2445 | break; | |
2446 | default: | |
2447 | /* only the above fields are valid */ | |
2448 | return -EINVAL; | |
2449 | } | |
2450 | ||
2451 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
2452 | if (!tmprule) | |
2453 | return -ENOMEM; | |
2454 | ||
2455 | context_init(&tmprule->au_ctxt); | |
2456 | ||
0804d113 | 2457 | read_lock(&policy_rwlock); |
376bd9cb DG |
2458 | |
2459 | tmprule->au_seqno = latest_granting; | |
2460 | ||
2461 | switch (field) { | |
3a6b9f85 | 2462 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2463 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2464 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
2465 | if (!userdatum) | |
2466 | rc = -EINVAL; | |
2467 | else | |
2468 | tmprule->au_ctxt.user = userdatum->value; | |
2469 | break; | |
3a6b9f85 | 2470 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2471 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2472 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
2473 | if (!roledatum) | |
2474 | rc = -EINVAL; | |
2475 | else | |
2476 | tmprule->au_ctxt.role = roledatum->value; | |
2477 | break; | |
3a6b9f85 | 2478 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2479 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2480 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
2481 | if (!typedatum) | |
2482 | rc = -EINVAL; | |
2483 | else | |
2484 | tmprule->au_ctxt.type = typedatum->value; | |
2485 | break; | |
3a6b9f85 DG |
2486 | case AUDIT_SUBJ_SEN: |
2487 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2488 | case AUDIT_OBJ_LEV_LOW: |
2489 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2490 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
2491 | break; | |
2492 | } | |
2493 | ||
0804d113 | 2494 | read_unlock(&policy_rwlock); |
376bd9cb DG |
2495 | |
2496 | if (rc) { | |
2497 | selinux_audit_rule_free(tmprule); | |
2498 | tmprule = NULL; | |
2499 | } | |
2500 | ||
2501 | *rule = tmprule; | |
2502 | ||
2503 | return rc; | |
2504 | } | |
2505 | ||
9d57a7f9 AD |
2506 | /* Check to see if the rule contains any selinux fields */ |
2507 | int selinux_audit_rule_known(struct audit_krule *rule) | |
2508 | { | |
2509 | int i; | |
2510 | ||
2511 | for (i = 0; i < rule->field_count; i++) { | |
2512 | struct audit_field *f = &rule->fields[i]; | |
2513 | switch (f->type) { | |
2514 | case AUDIT_SUBJ_USER: | |
2515 | case AUDIT_SUBJ_ROLE: | |
2516 | case AUDIT_SUBJ_TYPE: | |
2517 | case AUDIT_SUBJ_SEN: | |
2518 | case AUDIT_SUBJ_CLR: | |
2519 | case AUDIT_OBJ_USER: | |
2520 | case AUDIT_OBJ_ROLE: | |
2521 | case AUDIT_OBJ_TYPE: | |
2522 | case AUDIT_OBJ_LEV_LOW: | |
2523 | case AUDIT_OBJ_LEV_HIGH: | |
2524 | return 1; | |
2525 | } | |
2526 | } | |
2527 | ||
2528 | return 0; | |
2529 | } | |
2530 | ||
2531 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, | |
f5269710 | 2532 | struct audit_context *actx) |
376bd9cb DG |
2533 | { |
2534 | struct context *ctxt; | |
2535 | struct mls_level *level; | |
9d57a7f9 | 2536 | struct selinux_audit_rule *rule = vrule; |
376bd9cb DG |
2537 | int match = 0; |
2538 | ||
2539 | if (!rule) { | |
2540 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2541 | "selinux_audit_rule_match: missing rule\n"); |
376bd9cb DG |
2542 | return -ENOENT; |
2543 | } | |
2544 | ||
0804d113 | 2545 | read_lock(&policy_rwlock); |
376bd9cb DG |
2546 | |
2547 | if (rule->au_seqno < latest_granting) { | |
2548 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2549 | "selinux_audit_rule_match: stale rule\n"); |
376bd9cb DG |
2550 | match = -ESTALE; |
2551 | goto out; | |
2552 | } | |
2553 | ||
9a2f44f0 | 2554 | ctxt = sidtab_search(&sidtab, sid); |
376bd9cb DG |
2555 | if (!ctxt) { |
2556 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 EP |
2557 | "selinux_audit_rule_match: unrecognized SID %d\n", |
2558 | sid); | |
376bd9cb DG |
2559 | match = -ENOENT; |
2560 | goto out; | |
2561 | } | |
2562 | ||
2563 | /* a field/op pair that is not caught here will simply fall through | |
2564 | without a match */ | |
2565 | switch (field) { | |
3a6b9f85 | 2566 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2567 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2568 | switch (op) { |
2569 | case AUDIT_EQUAL: | |
2570 | match = (ctxt->user == rule->au_ctxt.user); | |
2571 | break; | |
2572 | case AUDIT_NOT_EQUAL: | |
2573 | match = (ctxt->user != rule->au_ctxt.user); | |
2574 | break; | |
2575 | } | |
2576 | break; | |
3a6b9f85 | 2577 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2578 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2579 | switch (op) { |
2580 | case AUDIT_EQUAL: | |
2581 | match = (ctxt->role == rule->au_ctxt.role); | |
2582 | break; | |
2583 | case AUDIT_NOT_EQUAL: | |
2584 | match = (ctxt->role != rule->au_ctxt.role); | |
2585 | break; | |
2586 | } | |
2587 | break; | |
3a6b9f85 | 2588 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2589 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2590 | switch (op) { |
2591 | case AUDIT_EQUAL: | |
2592 | match = (ctxt->type == rule->au_ctxt.type); | |
2593 | break; | |
2594 | case AUDIT_NOT_EQUAL: | |
2595 | match = (ctxt->type != rule->au_ctxt.type); | |
2596 | break; | |
2597 | } | |
2598 | break; | |
3a6b9f85 DG |
2599 | case AUDIT_SUBJ_SEN: |
2600 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2601 | case AUDIT_OBJ_LEV_LOW: |
2602 | case AUDIT_OBJ_LEV_HIGH: | |
2603 | level = ((field == AUDIT_SUBJ_SEN || | |
5d55a345 EP |
2604 | field == AUDIT_OBJ_LEV_LOW) ? |
2605 | &ctxt->range.level[0] : &ctxt->range.level[1]); | |
376bd9cb DG |
2606 | switch (op) { |
2607 | case AUDIT_EQUAL: | |
2608 | match = mls_level_eq(&rule->au_ctxt.range.level[0], | |
5d55a345 | 2609 | level); |
376bd9cb DG |
2610 | break; |
2611 | case AUDIT_NOT_EQUAL: | |
2612 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], | |
5d55a345 | 2613 | level); |
376bd9cb DG |
2614 | break; |
2615 | case AUDIT_LESS_THAN: | |
2616 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], | |
5d55a345 EP |
2617 | level) && |
2618 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2619 | level)); | |
376bd9cb DG |
2620 | break; |
2621 | case AUDIT_LESS_THAN_OR_EQUAL: | |
2622 | match = mls_level_dom(&rule->au_ctxt.range.level[0], | |
5d55a345 | 2623 | level); |
376bd9cb DG |
2624 | break; |
2625 | case AUDIT_GREATER_THAN: | |
2626 | match = (mls_level_dom(level, | |
5d55a345 EP |
2627 | &rule->au_ctxt.range.level[0]) && |
2628 | !mls_level_eq(level, | |
2629 | &rule->au_ctxt.range.level[0])); | |
376bd9cb DG |
2630 | break; |
2631 | case AUDIT_GREATER_THAN_OR_EQUAL: | |
2632 | match = mls_level_dom(level, | |
5d55a345 | 2633 | &rule->au_ctxt.range.level[0]); |
376bd9cb DG |
2634 | break; |
2635 | } | |
2636 | } | |
2637 | ||
2638 | out: | |
0804d113 | 2639 | read_unlock(&policy_rwlock); |
376bd9cb DG |
2640 | return match; |
2641 | } | |
2642 | ||
9d57a7f9 | 2643 | static int (*aurule_callback)(void) = audit_update_lsm_rules; |
376bd9cb DG |
2644 | |
2645 | static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid, | |
f5269710 | 2646 | u16 class, u32 perms, u32 *retained) |
376bd9cb DG |
2647 | { |
2648 | int err = 0; | |
2649 | ||
2650 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
2651 | err = aurule_callback(); | |
2652 | return err; | |
2653 | } | |
2654 | ||
2655 | static int __init aurule_init(void) | |
2656 | { | |
2657 | int err; | |
2658 | ||
2659 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET, | |
5d55a345 | 2660 | SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0); |
376bd9cb DG |
2661 | if (err) |
2662 | panic("avc_add_callback() failed, error %d\n", err); | |
2663 | ||
2664 | return err; | |
2665 | } | |
2666 | __initcall(aurule_init); | |
2667 | ||
7420ed23 | 2668 | #ifdef CONFIG_NETLABEL |
7420ed23 | 2669 | /** |
5778eabd PM |
2670 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
2671 | * @secattr: the NetLabel packet security attributes | |
5dbe1eb0 | 2672 | * @sid: the SELinux SID |
7420ed23 VY |
2673 | * |
2674 | * Description: | |
2675 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
2676 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
2677 | * already been initialized. | |
7420ed23 VY |
2678 | * |
2679 | */ | |
5778eabd | 2680 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
5dbe1eb0 | 2681 | u32 sid) |
7420ed23 | 2682 | { |
5dbe1eb0 | 2683 | u32 *sid_cache; |
7420ed23 | 2684 | |
5dbe1eb0 PM |
2685 | sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC); |
2686 | if (sid_cache == NULL) | |
5778eabd | 2687 | return; |
5dbe1eb0 PM |
2688 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
2689 | if (secattr->cache == NULL) { | |
2690 | kfree(sid_cache); | |
5778eabd | 2691 | return; |
0ec8abd7 | 2692 | } |
7420ed23 | 2693 | |
5dbe1eb0 PM |
2694 | *sid_cache = sid; |
2695 | secattr->cache->free = kfree; | |
2696 | secattr->cache->data = sid_cache; | |
5778eabd | 2697 | secattr->flags |= NETLBL_SECATTR_CACHE; |
7420ed23 VY |
2698 | } |
2699 | ||
2700 | /** | |
5778eabd | 2701 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 | 2702 | * @secattr: the NetLabel packet security attributes |
7420ed23 VY |
2703 | * @sid: the SELinux SID |
2704 | * | |
2705 | * Description: | |
5778eabd | 2706 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 2707 | * SELinux SID. If the @secattr field does not contain a full SELinux |
5dbe1eb0 PM |
2708 | * SID/context then use SECINITSID_NETMSG as the foundation. If possibile the |
2709 | * 'cache' field of @secattr is set and the CACHE flag is set; this is to | |
2710 | * allow the @secattr to be used by NetLabel to cache the secattr to SID | |
2711 | * conversion for future lookups. Returns zero on success, negative values on | |
2712 | * failure. | |
7420ed23 VY |
2713 | * |
2714 | */ | |
5778eabd | 2715 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
5778eabd | 2716 | u32 *sid) |
7420ed23 VY |
2717 | { |
2718 | int rc = -EIDRM; | |
2719 | struct context *ctx; | |
2720 | struct context ctx_new; | |
5778eabd PM |
2721 | |
2722 | if (!ss_initialized) { | |
2723 | *sid = SECSID_NULL; | |
2724 | return 0; | |
2725 | } | |
7420ed23 | 2726 | |
0804d113 | 2727 | read_lock(&policy_rwlock); |
7420ed23 | 2728 | |
701a90ba | 2729 | if (secattr->flags & NETLBL_SECATTR_CACHE) { |
5dbe1eb0 PM |
2730 | *sid = *(u32 *)secattr->cache->data; |
2731 | rc = 0; | |
16efd454 PM |
2732 | } else if (secattr->flags & NETLBL_SECATTR_SECID) { |
2733 | *sid = secattr->attr.secid; | |
2734 | rc = 0; | |
701a90ba | 2735 | } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
5dbe1eb0 | 2736 | ctx = sidtab_search(&sidtab, SECINITSID_NETMSG); |
7420ed23 VY |
2737 | if (ctx == NULL) |
2738 | goto netlbl_secattr_to_sid_return; | |
2739 | ||
2740 | ctx_new.user = ctx->user; | |
2741 | ctx_new.role = ctx->role; | |
2742 | ctx_new.type = ctx->type; | |
02752760 | 2743 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 2744 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
02752760 | 2745 | if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat, |
16efd454 | 2746 | secattr->attr.mls.cat) != 0) |
7420ed23 VY |
2747 | goto netlbl_secattr_to_sid_return; |
2748 | ctx_new.range.level[1].cat.highbit = | |
2749 | ctx_new.range.level[0].cat.highbit; | |
2750 | ctx_new.range.level[1].cat.node = | |
2751 | ctx_new.range.level[0].cat.node; | |
2752 | } else { | |
2753 | ebitmap_init(&ctx_new.range.level[0].cat); | |
2754 | ebitmap_init(&ctx_new.range.level[1].cat); | |
2755 | } | |
2756 | if (mls_context_isvalid(&policydb, &ctx_new) != 1) | |
2757 | goto netlbl_secattr_to_sid_return_cleanup; | |
2758 | ||
2759 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
2760 | if (rc != 0) | |
2761 | goto netlbl_secattr_to_sid_return_cleanup; | |
2762 | ||
5dbe1eb0 | 2763 | security_netlbl_cache_add(secattr, *sid); |
5778eabd | 2764 | |
7420ed23 VY |
2765 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
2766 | } else { | |
388b2405 | 2767 | *sid = SECSID_NULL; |
7420ed23 VY |
2768 | rc = 0; |
2769 | } | |
2770 | ||
2771 | netlbl_secattr_to_sid_return: | |
0804d113 | 2772 | read_unlock(&policy_rwlock); |
7420ed23 VY |
2773 | return rc; |
2774 | netlbl_secattr_to_sid_return_cleanup: | |
2775 | ebitmap_destroy(&ctx_new.range.level[0].cat); | |
2776 | goto netlbl_secattr_to_sid_return; | |
2777 | } | |
2778 | ||
2779 | /** | |
5778eabd PM |
2780 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
2781 | * @sid: the SELinux SID | |
2782 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
2783 | * |
2784 | * Description: | |
5778eabd PM |
2785 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
2786 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
2787 | * |
2788 | */ | |
5778eabd | 2789 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 VY |
2790 | { |
2791 | int rc = -ENOENT; | |
7420ed23 VY |
2792 | struct context *ctx; |
2793 | ||
2794 | if (!ss_initialized) | |
2795 | return 0; | |
2796 | ||
0804d113 | 2797 | read_lock(&policy_rwlock); |
7420ed23 VY |
2798 | ctx = sidtab_search(&sidtab, sid); |
2799 | if (ctx == NULL) | |
5778eabd PM |
2800 | goto netlbl_sid_to_secattr_failure; |
2801 | secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], | |
2802 | GFP_ATOMIC); | |
00447872 | 2803 | secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY; |
5778eabd PM |
2804 | mls_export_netlbl_lvl(ctx, secattr); |
2805 | rc = mls_export_netlbl_cat(ctx, secattr); | |
bf0edf39 | 2806 | if (rc != 0) |
5778eabd | 2807 | goto netlbl_sid_to_secattr_failure; |
0804d113 | 2808 | read_unlock(&policy_rwlock); |
99f59ed0 | 2809 | |
5778eabd | 2810 | return 0; |
f8687afe | 2811 | |
5778eabd | 2812 | netlbl_sid_to_secattr_failure: |
0804d113 | 2813 | read_unlock(&policy_rwlock); |
f8687afe PM |
2814 | return rc; |
2815 | } | |
7420ed23 | 2816 | #endif /* CONFIG_NETLABEL */ |