Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Implementation of the security services. | |
3 | * | |
4 | * Authors : Stephen Smalley, <sds@epoch.ncsc.mil> | |
5 | * James Morris <jmorris@redhat.com> | |
6 | * | |
7 | * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> | |
8 | * | |
9 | * Support for enhanced MLS infrastructure. | |
376bd9cb | 10 | * Support for context based audit filters. |
1da177e4 LT |
11 | * |
12 | * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> | |
13 | * | |
14 | * Added conditional policy language extensions | |
15 | * | |
7420ed23 VY |
16 | * Updated: Hewlett-Packard <paul.moore@hp.com> |
17 | * | |
18 | * Added support for NetLabel | |
19 | * | |
20 | * Copyright (C) 2006 Hewlett-Packard Development Company, L.P. | |
376bd9cb | 21 | * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. |
1da177e4 LT |
22 | * Copyright (C) 2003 - 2004 Tresys Technology, LLC |
23 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> | |
24 | * This program is free software; you can redistribute it and/or modify | |
25 | * it under the terms of the GNU General Public License as published by | |
26 | * the Free Software Foundation, version 2. | |
27 | */ | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/string.h> | |
31 | #include <linux/spinlock.h> | |
32 | #include <linux/errno.h> | |
33 | #include <linux/in.h> | |
34 | #include <linux/sched.h> | |
35 | #include <linux/audit.h> | |
bb003079 | 36 | #include <linux/mutex.h> |
7420ed23 VY |
37 | #include <net/sock.h> |
38 | #include <net/netlabel.h> | |
bb003079 | 39 | |
1da177e4 LT |
40 | #include "flask.h" |
41 | #include "avc.h" | |
42 | #include "avc_ss.h" | |
43 | #include "security.h" | |
44 | #include "context.h" | |
45 | #include "policydb.h" | |
46 | #include "sidtab.h" | |
47 | #include "services.h" | |
48 | #include "conditional.h" | |
49 | #include "mls.h" | |
7420ed23 VY |
50 | #include "objsec.h" |
51 | #include "selinux_netlabel.h" | |
1da177e4 LT |
52 | |
53 | extern void selnl_notify_policyload(u32 seqno); | |
54 | unsigned int policydb_loaded_version; | |
55 | ||
56 | static DEFINE_RWLOCK(policy_rwlock); | |
57 | #define POLICY_RDLOCK read_lock(&policy_rwlock) | |
58 | #define POLICY_WRLOCK write_lock_irq(&policy_rwlock) | |
59 | #define POLICY_RDUNLOCK read_unlock(&policy_rwlock) | |
60 | #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock) | |
61 | ||
bb003079 IM |
62 | static DEFINE_MUTEX(load_mutex); |
63 | #define LOAD_LOCK mutex_lock(&load_mutex) | |
64 | #define LOAD_UNLOCK mutex_unlock(&load_mutex) | |
1da177e4 LT |
65 | |
66 | static struct sidtab sidtab; | |
67 | struct policydb policydb; | |
68 | int ss_initialized = 0; | |
69 | ||
70 | /* | |
71 | * The largest sequence number that has been used when | |
72 | * providing an access decision to the access vector cache. | |
73 | * The sequence number only changes when a policy change | |
74 | * occurs. | |
75 | */ | |
76 | static u32 latest_granting = 0; | |
77 | ||
78 | /* Forward declaration. */ | |
79 | static int context_struct_to_string(struct context *context, char **scontext, | |
80 | u32 *scontext_len); | |
81 | ||
82 | /* | |
83 | * Return the boolean value of a constraint expression | |
84 | * when it is applied to the specified source and target | |
85 | * security contexts. | |
86 | * | |
87 | * xcontext is a special beast... It is used by the validatetrans rules | |
88 | * only. For these rules, scontext is the context before the transition, | |
89 | * tcontext is the context after the transition, and xcontext is the context | |
90 | * of the process performing the transition. All other callers of | |
91 | * constraint_expr_eval should pass in NULL for xcontext. | |
92 | */ | |
93 | static int constraint_expr_eval(struct context *scontext, | |
94 | struct context *tcontext, | |
95 | struct context *xcontext, | |
96 | struct constraint_expr *cexpr) | |
97 | { | |
98 | u32 val1, val2; | |
99 | struct context *c; | |
100 | struct role_datum *r1, *r2; | |
101 | struct mls_level *l1, *l2; | |
102 | struct constraint_expr *e; | |
103 | int s[CEXPR_MAXDEPTH]; | |
104 | int sp = -1; | |
105 | ||
106 | for (e = cexpr; e; e = e->next) { | |
107 | switch (e->expr_type) { | |
108 | case CEXPR_NOT: | |
109 | BUG_ON(sp < 0); | |
110 | s[sp] = !s[sp]; | |
111 | break; | |
112 | case CEXPR_AND: | |
113 | BUG_ON(sp < 1); | |
114 | sp--; | |
115 | s[sp] &= s[sp+1]; | |
116 | break; | |
117 | case CEXPR_OR: | |
118 | BUG_ON(sp < 1); | |
119 | sp--; | |
120 | s[sp] |= s[sp+1]; | |
121 | break; | |
122 | case CEXPR_ATTR: | |
123 | if (sp == (CEXPR_MAXDEPTH-1)) | |
124 | return 0; | |
125 | switch (e->attr) { | |
126 | case CEXPR_USER: | |
127 | val1 = scontext->user; | |
128 | val2 = tcontext->user; | |
129 | break; | |
130 | case CEXPR_TYPE: | |
131 | val1 = scontext->type; | |
132 | val2 = tcontext->type; | |
133 | break; | |
134 | case CEXPR_ROLE: | |
135 | val1 = scontext->role; | |
136 | val2 = tcontext->role; | |
137 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
138 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
139 | switch (e->op) { | |
140 | case CEXPR_DOM: | |
141 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
142 | val2 - 1); | |
143 | continue; | |
144 | case CEXPR_DOMBY: | |
145 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
146 | val1 - 1); | |
147 | continue; | |
148 | case CEXPR_INCOMP: | |
149 | s[++sp] = ( !ebitmap_get_bit(&r1->dominates, | |
150 | val2 - 1) && | |
151 | !ebitmap_get_bit(&r2->dominates, | |
152 | val1 - 1) ); | |
153 | continue; | |
154 | default: | |
155 | break; | |
156 | } | |
157 | break; | |
158 | case CEXPR_L1L2: | |
159 | l1 = &(scontext->range.level[0]); | |
160 | l2 = &(tcontext->range.level[0]); | |
161 | goto mls_ops; | |
162 | case CEXPR_L1H2: | |
163 | l1 = &(scontext->range.level[0]); | |
164 | l2 = &(tcontext->range.level[1]); | |
165 | goto mls_ops; | |
166 | case CEXPR_H1L2: | |
167 | l1 = &(scontext->range.level[1]); | |
168 | l2 = &(tcontext->range.level[0]); | |
169 | goto mls_ops; | |
170 | case CEXPR_H1H2: | |
171 | l1 = &(scontext->range.level[1]); | |
172 | l2 = &(tcontext->range.level[1]); | |
173 | goto mls_ops; | |
174 | case CEXPR_L1H1: | |
175 | l1 = &(scontext->range.level[0]); | |
176 | l2 = &(scontext->range.level[1]); | |
177 | goto mls_ops; | |
178 | case CEXPR_L2H2: | |
179 | l1 = &(tcontext->range.level[0]); | |
180 | l2 = &(tcontext->range.level[1]); | |
181 | goto mls_ops; | |
182 | mls_ops: | |
183 | switch (e->op) { | |
184 | case CEXPR_EQ: | |
185 | s[++sp] = mls_level_eq(l1, l2); | |
186 | continue; | |
187 | case CEXPR_NEQ: | |
188 | s[++sp] = !mls_level_eq(l1, l2); | |
189 | continue; | |
190 | case CEXPR_DOM: | |
191 | s[++sp] = mls_level_dom(l1, l2); | |
192 | continue; | |
193 | case CEXPR_DOMBY: | |
194 | s[++sp] = mls_level_dom(l2, l1); | |
195 | continue; | |
196 | case CEXPR_INCOMP: | |
197 | s[++sp] = mls_level_incomp(l2, l1); | |
198 | continue; | |
199 | default: | |
200 | BUG(); | |
201 | return 0; | |
202 | } | |
203 | break; | |
204 | default: | |
205 | BUG(); | |
206 | return 0; | |
207 | } | |
208 | ||
209 | switch (e->op) { | |
210 | case CEXPR_EQ: | |
211 | s[++sp] = (val1 == val2); | |
212 | break; | |
213 | case CEXPR_NEQ: | |
214 | s[++sp] = (val1 != val2); | |
215 | break; | |
216 | default: | |
217 | BUG(); | |
218 | return 0; | |
219 | } | |
220 | break; | |
221 | case CEXPR_NAMES: | |
222 | if (sp == (CEXPR_MAXDEPTH-1)) | |
223 | return 0; | |
224 | c = scontext; | |
225 | if (e->attr & CEXPR_TARGET) | |
226 | c = tcontext; | |
227 | else if (e->attr & CEXPR_XTARGET) { | |
228 | c = xcontext; | |
229 | if (!c) { | |
230 | BUG(); | |
231 | return 0; | |
232 | } | |
233 | } | |
234 | if (e->attr & CEXPR_USER) | |
235 | val1 = c->user; | |
236 | else if (e->attr & CEXPR_ROLE) | |
237 | val1 = c->role; | |
238 | else if (e->attr & CEXPR_TYPE) | |
239 | val1 = c->type; | |
240 | else { | |
241 | BUG(); | |
242 | return 0; | |
243 | } | |
244 | ||
245 | switch (e->op) { | |
246 | case CEXPR_EQ: | |
247 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
248 | break; | |
249 | case CEXPR_NEQ: | |
250 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
251 | break; | |
252 | default: | |
253 | BUG(); | |
254 | return 0; | |
255 | } | |
256 | break; | |
257 | default: | |
258 | BUG(); | |
259 | return 0; | |
260 | } | |
261 | } | |
262 | ||
263 | BUG_ON(sp != 0); | |
264 | return s[0]; | |
265 | } | |
266 | ||
267 | /* | |
268 | * Compute access vectors based on a context structure pair for | |
269 | * the permissions in a particular class. | |
270 | */ | |
271 | static int context_struct_compute_av(struct context *scontext, | |
272 | struct context *tcontext, | |
273 | u16 tclass, | |
274 | u32 requested, | |
275 | struct av_decision *avd) | |
276 | { | |
277 | struct constraint_node *constraint; | |
278 | struct role_allow *ra; | |
279 | struct avtab_key avkey; | |
782ebb99 | 280 | struct avtab_node *node; |
1da177e4 | 281 | struct class_datum *tclass_datum; |
782ebb99 SS |
282 | struct ebitmap *sattr, *tattr; |
283 | struct ebitmap_node *snode, *tnode; | |
284 | unsigned int i, j; | |
1da177e4 LT |
285 | |
286 | /* | |
287 | * Remap extended Netlink classes for old policy versions. | |
288 | * Do this here rather than socket_type_to_security_class() | |
289 | * in case a newer policy version is loaded, allowing sockets | |
290 | * to remain in the correct class. | |
291 | */ | |
292 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
293 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
294 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
295 | tclass = SECCLASS_NETLINK_SOCKET; | |
296 | ||
297 | if (!tclass || tclass > policydb.p_classes.nprim) { | |
298 | printk(KERN_ERR "security_compute_av: unrecognized class %d\n", | |
299 | tclass); | |
300 | return -EINVAL; | |
301 | } | |
302 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
303 | ||
304 | /* | |
305 | * Initialize the access vectors to the default values. | |
306 | */ | |
307 | avd->allowed = 0; | |
308 | avd->decided = 0xffffffff; | |
309 | avd->auditallow = 0; | |
310 | avd->auditdeny = 0xffffffff; | |
311 | avd->seqno = latest_granting; | |
312 | ||
313 | /* | |
314 | * If a specific type enforcement rule was defined for | |
315 | * this permission check, then use it. | |
316 | */ | |
1da177e4 | 317 | avkey.target_class = tclass; |
782ebb99 SS |
318 | avkey.specified = AVTAB_AV; |
319 | sattr = &policydb.type_attr_map[scontext->type - 1]; | |
320 | tattr = &policydb.type_attr_map[tcontext->type - 1]; | |
321 | ebitmap_for_each_bit(sattr, snode, i) { | |
322 | if (!ebitmap_node_get_bit(snode, i)) | |
323 | continue; | |
324 | ebitmap_for_each_bit(tattr, tnode, j) { | |
325 | if (!ebitmap_node_get_bit(tnode, j)) | |
326 | continue; | |
327 | avkey.source_type = i + 1; | |
328 | avkey.target_type = j + 1; | |
329 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
330 | node != NULL; | |
331 | node = avtab_search_node_next(node, avkey.specified)) { | |
332 | if (node->key.specified == AVTAB_ALLOWED) | |
333 | avd->allowed |= node->datum.data; | |
334 | else if (node->key.specified == AVTAB_AUDITALLOW) | |
335 | avd->auditallow |= node->datum.data; | |
336 | else if (node->key.specified == AVTAB_AUDITDENY) | |
337 | avd->auditdeny &= node->datum.data; | |
338 | } | |
1da177e4 | 339 | |
782ebb99 SS |
340 | /* Check conditional av table for additional permissions */ |
341 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); | |
342 | ||
343 | } | |
344 | } | |
1da177e4 LT |
345 | |
346 | /* | |
347 | * Remove any permissions prohibited by a constraint (this includes | |
348 | * the MLS policy). | |
349 | */ | |
350 | constraint = tclass_datum->constraints; | |
351 | while (constraint) { | |
352 | if ((constraint->permissions & (avd->allowed)) && | |
353 | !constraint_expr_eval(scontext, tcontext, NULL, | |
354 | constraint->expr)) { | |
355 | avd->allowed = (avd->allowed) & ~(constraint->permissions); | |
356 | } | |
357 | constraint = constraint->next; | |
358 | } | |
359 | ||
360 | /* | |
361 | * If checking process transition permission and the | |
362 | * role is changing, then check the (current_role, new_role) | |
363 | * pair. | |
364 | */ | |
365 | if (tclass == SECCLASS_PROCESS && | |
366 | (avd->allowed & (PROCESS__TRANSITION | PROCESS__DYNTRANSITION)) && | |
367 | scontext->role != tcontext->role) { | |
368 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
369 | if (scontext->role == ra->role && | |
370 | tcontext->role == ra->new_role) | |
371 | break; | |
372 | } | |
373 | if (!ra) | |
374 | avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION | | |
375 | PROCESS__DYNTRANSITION); | |
376 | } | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
381 | static int security_validtrans_handle_fail(struct context *ocontext, | |
382 | struct context *ncontext, | |
383 | struct context *tcontext, | |
384 | u16 tclass) | |
385 | { | |
386 | char *o = NULL, *n = NULL, *t = NULL; | |
387 | u32 olen, nlen, tlen; | |
388 | ||
389 | if (context_struct_to_string(ocontext, &o, &olen) < 0) | |
390 | goto out; | |
391 | if (context_struct_to_string(ncontext, &n, &nlen) < 0) | |
392 | goto out; | |
393 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
394 | goto out; | |
9ad9ad38 | 395 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
396 | "security_validate_transition: denied for" |
397 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", | |
398 | o, n, t, policydb.p_class_val_to_name[tclass-1]); | |
399 | out: | |
400 | kfree(o); | |
401 | kfree(n); | |
402 | kfree(t); | |
403 | ||
404 | if (!selinux_enforcing) | |
405 | return 0; | |
406 | return -EPERM; | |
407 | } | |
408 | ||
409 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
410 | u16 tclass) | |
411 | { | |
412 | struct context *ocontext; | |
413 | struct context *ncontext; | |
414 | struct context *tcontext; | |
415 | struct class_datum *tclass_datum; | |
416 | struct constraint_node *constraint; | |
417 | int rc = 0; | |
418 | ||
419 | if (!ss_initialized) | |
420 | return 0; | |
421 | ||
422 | POLICY_RDLOCK; | |
423 | ||
424 | /* | |
425 | * Remap extended Netlink classes for old policy versions. | |
426 | * Do this here rather than socket_type_to_security_class() | |
427 | * in case a newer policy version is loaded, allowing sockets | |
428 | * to remain in the correct class. | |
429 | */ | |
430 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) | |
431 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && | |
432 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) | |
433 | tclass = SECCLASS_NETLINK_SOCKET; | |
434 | ||
435 | if (!tclass || tclass > policydb.p_classes.nprim) { | |
436 | printk(KERN_ERR "security_validate_transition: " | |
437 | "unrecognized class %d\n", tclass); | |
438 | rc = -EINVAL; | |
439 | goto out; | |
440 | } | |
441 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
442 | ||
443 | ocontext = sidtab_search(&sidtab, oldsid); | |
444 | if (!ocontext) { | |
445 | printk(KERN_ERR "security_validate_transition: " | |
446 | " unrecognized SID %d\n", oldsid); | |
447 | rc = -EINVAL; | |
448 | goto out; | |
449 | } | |
450 | ||
451 | ncontext = sidtab_search(&sidtab, newsid); | |
452 | if (!ncontext) { | |
453 | printk(KERN_ERR "security_validate_transition: " | |
454 | " unrecognized SID %d\n", newsid); | |
455 | rc = -EINVAL; | |
456 | goto out; | |
457 | } | |
458 | ||
459 | tcontext = sidtab_search(&sidtab, tasksid); | |
460 | if (!tcontext) { | |
461 | printk(KERN_ERR "security_validate_transition: " | |
462 | " unrecognized SID %d\n", tasksid); | |
463 | rc = -EINVAL; | |
464 | goto out; | |
465 | } | |
466 | ||
467 | constraint = tclass_datum->validatetrans; | |
468 | while (constraint) { | |
469 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
470 | constraint->expr)) { | |
471 | rc = security_validtrans_handle_fail(ocontext, ncontext, | |
472 | tcontext, tclass); | |
473 | goto out; | |
474 | } | |
475 | constraint = constraint->next; | |
476 | } | |
477 | ||
478 | out: | |
479 | POLICY_RDUNLOCK; | |
480 | return rc; | |
481 | } | |
482 | ||
483 | /** | |
484 | * security_compute_av - Compute access vector decisions. | |
485 | * @ssid: source security identifier | |
486 | * @tsid: target security identifier | |
487 | * @tclass: target security class | |
488 | * @requested: requested permissions | |
489 | * @avd: access vector decisions | |
490 | * | |
491 | * Compute a set of access vector decisions based on the | |
492 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
493 | * Return -%EINVAL if any of the parameters are invalid or %0 | |
494 | * if the access vector decisions were computed successfully. | |
495 | */ | |
496 | int security_compute_av(u32 ssid, | |
497 | u32 tsid, | |
498 | u16 tclass, | |
499 | u32 requested, | |
500 | struct av_decision *avd) | |
501 | { | |
502 | struct context *scontext = NULL, *tcontext = NULL; | |
503 | int rc = 0; | |
504 | ||
505 | if (!ss_initialized) { | |
4c443d1b SS |
506 | avd->allowed = 0xffffffff; |
507 | avd->decided = 0xffffffff; | |
1da177e4 LT |
508 | avd->auditallow = 0; |
509 | avd->auditdeny = 0xffffffff; | |
510 | avd->seqno = latest_granting; | |
511 | return 0; | |
512 | } | |
513 | ||
514 | POLICY_RDLOCK; | |
515 | ||
516 | scontext = sidtab_search(&sidtab, ssid); | |
517 | if (!scontext) { | |
518 | printk(KERN_ERR "security_compute_av: unrecognized SID %d\n", | |
519 | ssid); | |
520 | rc = -EINVAL; | |
521 | goto out; | |
522 | } | |
523 | tcontext = sidtab_search(&sidtab, tsid); | |
524 | if (!tcontext) { | |
525 | printk(KERN_ERR "security_compute_av: unrecognized SID %d\n", | |
526 | tsid); | |
527 | rc = -EINVAL; | |
528 | goto out; | |
529 | } | |
530 | ||
531 | rc = context_struct_compute_av(scontext, tcontext, tclass, | |
532 | requested, avd); | |
533 | out: | |
534 | POLICY_RDUNLOCK; | |
535 | return rc; | |
536 | } | |
537 | ||
538 | /* | |
539 | * Write the security context string representation of | |
540 | * the context structure `context' into a dynamically | |
541 | * allocated string of the correct size. Set `*scontext' | |
542 | * to point to this string and set `*scontext_len' to | |
543 | * the length of the string. | |
544 | */ | |
545 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
546 | { | |
547 | char *scontextp; | |
548 | ||
549 | *scontext = NULL; | |
550 | *scontext_len = 0; | |
551 | ||
552 | /* Compute the size of the context. */ | |
553 | *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; | |
554 | *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; | |
555 | *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; | |
556 | *scontext_len += mls_compute_context_len(context); | |
557 | ||
558 | /* Allocate space for the context; caller must free this space. */ | |
559 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
560 | if (!scontextp) { | |
561 | return -ENOMEM; | |
562 | } | |
563 | *scontext = scontextp; | |
564 | ||
565 | /* | |
566 | * Copy the user name, role name and type name into the context. | |
567 | */ | |
568 | sprintf(scontextp, "%s:%s:%s", | |
569 | policydb.p_user_val_to_name[context->user - 1], | |
570 | policydb.p_role_val_to_name[context->role - 1], | |
571 | policydb.p_type_val_to_name[context->type - 1]); | |
572 | scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + | |
573 | 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + | |
574 | 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); | |
575 | ||
576 | mls_sid_to_context(context, &scontextp); | |
577 | ||
578 | *scontextp = 0; | |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
583 | #include "initial_sid_to_string.h" | |
584 | ||
585 | /** | |
586 | * security_sid_to_context - Obtain a context for a given SID. | |
587 | * @sid: security identifier, SID | |
588 | * @scontext: security context | |
589 | * @scontext_len: length in bytes | |
590 | * | |
591 | * Write the string representation of the context associated with @sid | |
592 | * into a dynamically allocated string of the correct size. Set @scontext | |
593 | * to point to this string and set @scontext_len to the length of the string. | |
594 | */ | |
595 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
596 | { | |
597 | struct context *context; | |
598 | int rc = 0; | |
599 | ||
600 | if (!ss_initialized) { | |
601 | if (sid <= SECINITSID_NUM) { | |
602 | char *scontextp; | |
603 | ||
604 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
605 | scontextp = kmalloc(*scontext_len,GFP_ATOMIC); | |
0cccca06 SH |
606 | if (!scontextp) { |
607 | rc = -ENOMEM; | |
608 | goto out; | |
609 | } | |
1da177e4 LT |
610 | strcpy(scontextp, initial_sid_to_string[sid]); |
611 | *scontext = scontextp; | |
612 | goto out; | |
613 | } | |
614 | printk(KERN_ERR "security_sid_to_context: called before initial " | |
615 | "load_policy on unknown SID %d\n", sid); | |
616 | rc = -EINVAL; | |
617 | goto out; | |
618 | } | |
619 | POLICY_RDLOCK; | |
620 | context = sidtab_search(&sidtab, sid); | |
621 | if (!context) { | |
622 | printk(KERN_ERR "security_sid_to_context: unrecognized SID " | |
623 | "%d\n", sid); | |
624 | rc = -EINVAL; | |
625 | goto out_unlock; | |
626 | } | |
627 | rc = context_struct_to_string(context, scontext, scontext_len); | |
628 | out_unlock: | |
629 | POLICY_RDUNLOCK; | |
630 | out: | |
631 | return rc; | |
632 | ||
633 | } | |
634 | ||
f5c1d5b2 | 635 | static int security_context_to_sid_core(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid) |
1da177e4 LT |
636 | { |
637 | char *scontext2; | |
638 | struct context context; | |
639 | struct role_datum *role; | |
640 | struct type_datum *typdatum; | |
641 | struct user_datum *usrdatum; | |
642 | char *scontextp, *p, oldc; | |
643 | int rc = 0; | |
644 | ||
645 | if (!ss_initialized) { | |
646 | int i; | |
647 | ||
648 | for (i = 1; i < SECINITSID_NUM; i++) { | |
649 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
650 | *sid = i; | |
651 | goto out; | |
652 | } | |
653 | } | |
654 | *sid = SECINITSID_KERNEL; | |
655 | goto out; | |
656 | } | |
657 | *sid = SECSID_NULL; | |
658 | ||
659 | /* Copy the string so that we can modify the copy as we parse it. | |
660 | The string should already by null terminated, but we append a | |
661 | null suffix to the copy to avoid problems with the existing | |
662 | attr package, which doesn't view the null terminator as part | |
663 | of the attribute value. */ | |
664 | scontext2 = kmalloc(scontext_len+1,GFP_KERNEL); | |
665 | if (!scontext2) { | |
666 | rc = -ENOMEM; | |
667 | goto out; | |
668 | } | |
669 | memcpy(scontext2, scontext, scontext_len); | |
670 | scontext2[scontext_len] = 0; | |
671 | ||
672 | context_init(&context); | |
673 | *sid = SECSID_NULL; | |
674 | ||
675 | POLICY_RDLOCK; | |
676 | ||
677 | /* Parse the security context. */ | |
678 | ||
679 | rc = -EINVAL; | |
680 | scontextp = (char *) scontext2; | |
681 | ||
682 | /* Extract the user. */ | |
683 | p = scontextp; | |
684 | while (*p && *p != ':') | |
685 | p++; | |
686 | ||
687 | if (*p == 0) | |
688 | goto out_unlock; | |
689 | ||
690 | *p++ = 0; | |
691 | ||
692 | usrdatum = hashtab_search(policydb.p_users.table, scontextp); | |
693 | if (!usrdatum) | |
694 | goto out_unlock; | |
695 | ||
696 | context.user = usrdatum->value; | |
697 | ||
698 | /* Extract role. */ | |
699 | scontextp = p; | |
700 | while (*p && *p != ':') | |
701 | p++; | |
702 | ||
703 | if (*p == 0) | |
704 | goto out_unlock; | |
705 | ||
706 | *p++ = 0; | |
707 | ||
708 | role = hashtab_search(policydb.p_roles.table, scontextp); | |
709 | if (!role) | |
710 | goto out_unlock; | |
711 | context.role = role->value; | |
712 | ||
713 | /* Extract type. */ | |
714 | scontextp = p; | |
715 | while (*p && *p != ':') | |
716 | p++; | |
717 | oldc = *p; | |
718 | *p++ = 0; | |
719 | ||
720 | typdatum = hashtab_search(policydb.p_types.table, scontextp); | |
721 | if (!typdatum) | |
722 | goto out_unlock; | |
723 | ||
724 | context.type = typdatum->value; | |
725 | ||
f5c1d5b2 | 726 | rc = mls_context_to_sid(oldc, &p, &context, &sidtab, def_sid); |
1da177e4 LT |
727 | if (rc) |
728 | goto out_unlock; | |
729 | ||
730 | if ((p - scontext2) < scontext_len) { | |
731 | rc = -EINVAL; | |
732 | goto out_unlock; | |
733 | } | |
734 | ||
735 | /* Check the validity of the new context. */ | |
736 | if (!policydb_context_isvalid(&policydb, &context)) { | |
737 | rc = -EINVAL; | |
738 | goto out_unlock; | |
739 | } | |
740 | /* Obtain the new sid. */ | |
741 | rc = sidtab_context_to_sid(&sidtab, &context, sid); | |
742 | out_unlock: | |
743 | POLICY_RDUNLOCK; | |
744 | context_destroy(&context); | |
745 | kfree(scontext2); | |
746 | out: | |
747 | return rc; | |
748 | } | |
749 | ||
f5c1d5b2 JM |
750 | /** |
751 | * security_context_to_sid - Obtain a SID for a given security context. | |
752 | * @scontext: security context | |
753 | * @scontext_len: length in bytes | |
754 | * @sid: security identifier, SID | |
755 | * | |
756 | * Obtains a SID associated with the security context that | |
757 | * has the string representation specified by @scontext. | |
758 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
759 | * memory is available, or 0 on success. | |
760 | */ | |
761 | int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid) | |
762 | { | |
763 | return security_context_to_sid_core(scontext, scontext_len, | |
764 | sid, SECSID_NULL); | |
765 | } | |
766 | ||
767 | /** | |
768 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
769 | * falling back to specified default if needed. | |
770 | * | |
771 | * @scontext: security context | |
772 | * @scontext_len: length in bytes | |
773 | * @sid: security identifier, SID | |
774 | * @def_sid: default SID to assign on errror | |
775 | * | |
776 | * Obtains a SID associated with the security context that | |
777 | * has the string representation specified by @scontext. | |
778 | * The default SID is passed to the MLS layer to be used to allow | |
779 | * kernel labeling of the MLS field if the MLS field is not present | |
780 | * (for upgrading to MLS without full relabel). | |
781 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
782 | * memory is available, or 0 on success. | |
783 | */ | |
784 | int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid) | |
785 | { | |
786 | return security_context_to_sid_core(scontext, scontext_len, | |
787 | sid, def_sid); | |
788 | } | |
789 | ||
1da177e4 LT |
790 | static int compute_sid_handle_invalid_context( |
791 | struct context *scontext, | |
792 | struct context *tcontext, | |
793 | u16 tclass, | |
794 | struct context *newcontext) | |
795 | { | |
796 | char *s = NULL, *t = NULL, *n = NULL; | |
797 | u32 slen, tlen, nlen; | |
798 | ||
799 | if (context_struct_to_string(scontext, &s, &slen) < 0) | |
800 | goto out; | |
801 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
802 | goto out; | |
803 | if (context_struct_to_string(newcontext, &n, &nlen) < 0) | |
804 | goto out; | |
9ad9ad38 | 805 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
806 | "security_compute_sid: invalid context %s" |
807 | " for scontext=%s" | |
808 | " tcontext=%s" | |
809 | " tclass=%s", | |
810 | n, s, t, policydb.p_class_val_to_name[tclass-1]); | |
811 | out: | |
812 | kfree(s); | |
813 | kfree(t); | |
814 | kfree(n); | |
815 | if (!selinux_enforcing) | |
816 | return 0; | |
817 | return -EACCES; | |
818 | } | |
819 | ||
820 | static int security_compute_sid(u32 ssid, | |
821 | u32 tsid, | |
822 | u16 tclass, | |
823 | u32 specified, | |
824 | u32 *out_sid) | |
825 | { | |
826 | struct context *scontext = NULL, *tcontext = NULL, newcontext; | |
827 | struct role_trans *roletr = NULL; | |
828 | struct avtab_key avkey; | |
829 | struct avtab_datum *avdatum; | |
830 | struct avtab_node *node; | |
1da177e4 LT |
831 | int rc = 0; |
832 | ||
833 | if (!ss_initialized) { | |
834 | switch (tclass) { | |
835 | case SECCLASS_PROCESS: | |
836 | *out_sid = ssid; | |
837 | break; | |
838 | default: | |
839 | *out_sid = tsid; | |
840 | break; | |
841 | } | |
842 | goto out; | |
843 | } | |
844 | ||
851f8a69 VY |
845 | context_init(&newcontext); |
846 | ||
1da177e4 LT |
847 | POLICY_RDLOCK; |
848 | ||
849 | scontext = sidtab_search(&sidtab, ssid); | |
850 | if (!scontext) { | |
851 | printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n", | |
852 | ssid); | |
853 | rc = -EINVAL; | |
854 | goto out_unlock; | |
855 | } | |
856 | tcontext = sidtab_search(&sidtab, tsid); | |
857 | if (!tcontext) { | |
858 | printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n", | |
859 | tsid); | |
860 | rc = -EINVAL; | |
861 | goto out_unlock; | |
862 | } | |
863 | ||
1da177e4 LT |
864 | /* Set the user identity. */ |
865 | switch (specified) { | |
866 | case AVTAB_TRANSITION: | |
867 | case AVTAB_CHANGE: | |
868 | /* Use the process user identity. */ | |
869 | newcontext.user = scontext->user; | |
870 | break; | |
871 | case AVTAB_MEMBER: | |
872 | /* Use the related object owner. */ | |
873 | newcontext.user = tcontext->user; | |
874 | break; | |
875 | } | |
876 | ||
877 | /* Set the role and type to default values. */ | |
878 | switch (tclass) { | |
879 | case SECCLASS_PROCESS: | |
880 | /* Use the current role and type of process. */ | |
881 | newcontext.role = scontext->role; | |
882 | newcontext.type = scontext->type; | |
883 | break; | |
884 | default: | |
885 | /* Use the well-defined object role. */ | |
886 | newcontext.role = OBJECT_R_VAL; | |
887 | /* Use the type of the related object. */ | |
888 | newcontext.type = tcontext->type; | |
889 | } | |
890 | ||
891 | /* Look for a type transition/member/change rule. */ | |
892 | avkey.source_type = scontext->type; | |
893 | avkey.target_type = tcontext->type; | |
894 | avkey.target_class = tclass; | |
782ebb99 SS |
895 | avkey.specified = specified; |
896 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
897 | |
898 | /* If no permanent rule, also check for enabled conditional rules */ | |
899 | if(!avdatum) { | |
782ebb99 | 900 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
1da177e4 | 901 | for (; node != NULL; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 902 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
903 | avdatum = &node->datum; |
904 | break; | |
905 | } | |
906 | } | |
907 | } | |
908 | ||
782ebb99 | 909 | if (avdatum) { |
1da177e4 | 910 | /* Use the type from the type transition/member/change rule. */ |
782ebb99 | 911 | newcontext.type = avdatum->data; |
1da177e4 LT |
912 | } |
913 | ||
914 | /* Check for class-specific changes. */ | |
915 | switch (tclass) { | |
916 | case SECCLASS_PROCESS: | |
917 | if (specified & AVTAB_TRANSITION) { | |
918 | /* Look for a role transition rule. */ | |
919 | for (roletr = policydb.role_tr; roletr; | |
920 | roletr = roletr->next) { | |
921 | if (roletr->role == scontext->role && | |
922 | roletr->type == tcontext->type) { | |
923 | /* Use the role transition rule. */ | |
924 | newcontext.role = roletr->new_role; | |
925 | break; | |
926 | } | |
927 | } | |
928 | } | |
929 | break; | |
930 | default: | |
931 | break; | |
932 | } | |
933 | ||
934 | /* Set the MLS attributes. | |
935 | This is done last because it may allocate memory. */ | |
936 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext); | |
937 | if (rc) | |
938 | goto out_unlock; | |
939 | ||
940 | /* Check the validity of the context. */ | |
941 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
942 | rc = compute_sid_handle_invalid_context(scontext, | |
943 | tcontext, | |
944 | tclass, | |
945 | &newcontext); | |
946 | if (rc) | |
947 | goto out_unlock; | |
948 | } | |
949 | /* Obtain the sid for the context. */ | |
950 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
951 | out_unlock: | |
952 | POLICY_RDUNLOCK; | |
953 | context_destroy(&newcontext); | |
954 | out: | |
955 | return rc; | |
956 | } | |
957 | ||
958 | /** | |
959 | * security_transition_sid - Compute the SID for a new subject/object. | |
960 | * @ssid: source security identifier | |
961 | * @tsid: target security identifier | |
962 | * @tclass: target security class | |
963 | * @out_sid: security identifier for new subject/object | |
964 | * | |
965 | * Compute a SID to use for labeling a new subject or object in the | |
966 | * class @tclass based on a SID pair (@ssid, @tsid). | |
967 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
968 | * if insufficient memory is available, or %0 if the new SID was | |
969 | * computed successfully. | |
970 | */ | |
971 | int security_transition_sid(u32 ssid, | |
972 | u32 tsid, | |
973 | u16 tclass, | |
974 | u32 *out_sid) | |
975 | { | |
976 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid); | |
977 | } | |
978 | ||
979 | /** | |
980 | * security_member_sid - Compute the SID for member selection. | |
981 | * @ssid: source security identifier | |
982 | * @tsid: target security identifier | |
983 | * @tclass: target security class | |
984 | * @out_sid: security identifier for selected member | |
985 | * | |
986 | * Compute a SID to use when selecting a member of a polyinstantiated | |
987 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
988 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
989 | * if insufficient memory is available, or %0 if the SID was | |
990 | * computed successfully. | |
991 | */ | |
992 | int security_member_sid(u32 ssid, | |
993 | u32 tsid, | |
994 | u16 tclass, | |
995 | u32 *out_sid) | |
996 | { | |
997 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid); | |
998 | } | |
999 | ||
1000 | /** | |
1001 | * security_change_sid - Compute the SID for object relabeling. | |
1002 | * @ssid: source security identifier | |
1003 | * @tsid: target security identifier | |
1004 | * @tclass: target security class | |
1005 | * @out_sid: security identifier for selected member | |
1006 | * | |
1007 | * Compute a SID to use for relabeling an object of class @tclass | |
1008 | * based on a SID pair (@ssid, @tsid). | |
1009 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1010 | * if insufficient memory is available, or %0 if the SID was | |
1011 | * computed successfully. | |
1012 | */ | |
1013 | int security_change_sid(u32 ssid, | |
1014 | u32 tsid, | |
1015 | u16 tclass, | |
1016 | u32 *out_sid) | |
1017 | { | |
1018 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid); | |
1019 | } | |
1020 | ||
1021 | /* | |
1022 | * Verify that each permission that is defined under the | |
1023 | * existing policy is still defined with the same value | |
1024 | * in the new policy. | |
1025 | */ | |
1026 | static int validate_perm(void *key, void *datum, void *p) | |
1027 | { | |
1028 | struct hashtab *h; | |
1029 | struct perm_datum *perdatum, *perdatum2; | |
1030 | int rc = 0; | |
1031 | ||
1032 | ||
1033 | h = p; | |
1034 | perdatum = datum; | |
1035 | ||
1036 | perdatum2 = hashtab_search(h, key); | |
1037 | if (!perdatum2) { | |
1038 | printk(KERN_ERR "security: permission %s disappeared", | |
1039 | (char *)key); | |
1040 | rc = -ENOENT; | |
1041 | goto out; | |
1042 | } | |
1043 | if (perdatum->value != perdatum2->value) { | |
1044 | printk(KERN_ERR "security: the value of permission %s changed", | |
1045 | (char *)key); | |
1046 | rc = -EINVAL; | |
1047 | } | |
1048 | out: | |
1049 | return rc; | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * Verify that each class that is defined under the | |
1054 | * existing policy is still defined with the same | |
1055 | * attributes in the new policy. | |
1056 | */ | |
1057 | static int validate_class(void *key, void *datum, void *p) | |
1058 | { | |
1059 | struct policydb *newp; | |
1060 | struct class_datum *cladatum, *cladatum2; | |
1061 | int rc; | |
1062 | ||
1063 | newp = p; | |
1064 | cladatum = datum; | |
1065 | ||
1066 | cladatum2 = hashtab_search(newp->p_classes.table, key); | |
1067 | if (!cladatum2) { | |
1068 | printk(KERN_ERR "security: class %s disappeared\n", | |
1069 | (char *)key); | |
1070 | rc = -ENOENT; | |
1071 | goto out; | |
1072 | } | |
1073 | if (cladatum->value != cladatum2->value) { | |
1074 | printk(KERN_ERR "security: the value of class %s changed\n", | |
1075 | (char *)key); | |
1076 | rc = -EINVAL; | |
1077 | goto out; | |
1078 | } | |
1079 | if ((cladatum->comdatum && !cladatum2->comdatum) || | |
1080 | (!cladatum->comdatum && cladatum2->comdatum)) { | |
1081 | printk(KERN_ERR "security: the inherits clause for the access " | |
1082 | "vector definition for class %s changed\n", (char *)key); | |
1083 | rc = -EINVAL; | |
1084 | goto out; | |
1085 | } | |
1086 | if (cladatum->comdatum) { | |
1087 | rc = hashtab_map(cladatum->comdatum->permissions.table, validate_perm, | |
1088 | cladatum2->comdatum->permissions.table); | |
1089 | if (rc) { | |
1090 | printk(" in the access vector definition for class " | |
1091 | "%s\n", (char *)key); | |
1092 | goto out; | |
1093 | } | |
1094 | } | |
1095 | rc = hashtab_map(cladatum->permissions.table, validate_perm, | |
1096 | cladatum2->permissions.table); | |
1097 | if (rc) | |
1098 | printk(" in access vector definition for class %s\n", | |
1099 | (char *)key); | |
1100 | out: | |
1101 | return rc; | |
1102 | } | |
1103 | ||
1104 | /* Clone the SID into the new SID table. */ | |
1105 | static int clone_sid(u32 sid, | |
1106 | struct context *context, | |
1107 | void *arg) | |
1108 | { | |
1109 | struct sidtab *s = arg; | |
1110 | ||
1111 | return sidtab_insert(s, sid, context); | |
1112 | } | |
1113 | ||
1114 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1115 | { | |
1116 | int rc = 0; | |
1117 | ||
1118 | if (selinux_enforcing) { | |
1119 | rc = -EINVAL; | |
1120 | } else { | |
1121 | char *s; | |
1122 | u32 len; | |
1123 | ||
1124 | context_struct_to_string(context, &s, &len); | |
1125 | printk(KERN_ERR "security: context %s is invalid\n", s); | |
1126 | kfree(s); | |
1127 | } | |
1128 | return rc; | |
1129 | } | |
1130 | ||
1131 | struct convert_context_args { | |
1132 | struct policydb *oldp; | |
1133 | struct policydb *newp; | |
1134 | }; | |
1135 | ||
1136 | /* | |
1137 | * Convert the values in the security context | |
1138 | * structure `c' from the values specified | |
1139 | * in the policy `p->oldp' to the values specified | |
1140 | * in the policy `p->newp'. Verify that the | |
1141 | * context is valid under the new policy. | |
1142 | */ | |
1143 | static int convert_context(u32 key, | |
1144 | struct context *c, | |
1145 | void *p) | |
1146 | { | |
1147 | struct convert_context_args *args; | |
1148 | struct context oldc; | |
1149 | struct role_datum *role; | |
1150 | struct type_datum *typdatum; | |
1151 | struct user_datum *usrdatum; | |
1152 | char *s; | |
1153 | u32 len; | |
1154 | int rc; | |
1155 | ||
1156 | args = p; | |
1157 | ||
1158 | rc = context_cpy(&oldc, c); | |
1159 | if (rc) | |
1160 | goto out; | |
1161 | ||
1162 | rc = -EINVAL; | |
1163 | ||
1164 | /* Convert the user. */ | |
1165 | usrdatum = hashtab_search(args->newp->p_users.table, | |
1166 | args->oldp->p_user_val_to_name[c->user - 1]); | |
1167 | if (!usrdatum) { | |
1168 | goto bad; | |
1169 | } | |
1170 | c->user = usrdatum->value; | |
1171 | ||
1172 | /* Convert the role. */ | |
1173 | role = hashtab_search(args->newp->p_roles.table, | |
1174 | args->oldp->p_role_val_to_name[c->role - 1]); | |
1175 | if (!role) { | |
1176 | goto bad; | |
1177 | } | |
1178 | c->role = role->value; | |
1179 | ||
1180 | /* Convert the type. */ | |
1181 | typdatum = hashtab_search(args->newp->p_types.table, | |
1182 | args->oldp->p_type_val_to_name[c->type - 1]); | |
1183 | if (!typdatum) { | |
1184 | goto bad; | |
1185 | } | |
1186 | c->type = typdatum->value; | |
1187 | ||
1188 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1189 | if (rc) | |
1190 | goto bad; | |
1191 | ||
1192 | /* Check the validity of the new context. */ | |
1193 | if (!policydb_context_isvalid(args->newp, c)) { | |
1194 | rc = convert_context_handle_invalid_context(&oldc); | |
1195 | if (rc) | |
1196 | goto bad; | |
1197 | } | |
1198 | ||
1199 | context_destroy(&oldc); | |
1200 | out: | |
1201 | return rc; | |
1202 | bad: | |
1203 | context_struct_to_string(&oldc, &s, &len); | |
1204 | context_destroy(&oldc); | |
1205 | printk(KERN_ERR "security: invalidating context %s\n", s); | |
1206 | kfree(s); | |
1207 | goto out; | |
1208 | } | |
1209 | ||
1210 | extern void selinux_complete_init(void); | |
1211 | ||
1212 | /** | |
1213 | * security_load_policy - Load a security policy configuration. | |
1214 | * @data: binary policy data | |
1215 | * @len: length of data in bytes | |
1216 | * | |
1217 | * Load a new set of security policy configuration data, | |
1218 | * validate it and convert the SID table as necessary. | |
1219 | * This function will flush the access vector cache after | |
1220 | * loading the new policy. | |
1221 | */ | |
1222 | int security_load_policy(void *data, size_t len) | |
1223 | { | |
1224 | struct policydb oldpolicydb, newpolicydb; | |
1225 | struct sidtab oldsidtab, newsidtab; | |
1226 | struct convert_context_args args; | |
1227 | u32 seqno; | |
1228 | int rc = 0; | |
1229 | struct policy_file file = { data, len }, *fp = &file; | |
1230 | ||
1231 | LOAD_LOCK; | |
1232 | ||
1233 | if (!ss_initialized) { | |
1234 | avtab_cache_init(); | |
1235 | if (policydb_read(&policydb, fp)) { | |
1236 | LOAD_UNLOCK; | |
1237 | avtab_cache_destroy(); | |
1238 | return -EINVAL; | |
1239 | } | |
1240 | if (policydb_load_isids(&policydb, &sidtab)) { | |
1241 | LOAD_UNLOCK; | |
1242 | policydb_destroy(&policydb); | |
1243 | avtab_cache_destroy(); | |
1244 | return -EINVAL; | |
1245 | } | |
1246 | policydb_loaded_version = policydb.policyvers; | |
1247 | ss_initialized = 1; | |
4c443d1b | 1248 | seqno = ++latest_granting; |
1da177e4 LT |
1249 | LOAD_UNLOCK; |
1250 | selinux_complete_init(); | |
4c443d1b SS |
1251 | avc_ss_reset(seqno); |
1252 | selnl_notify_policyload(seqno); | |
7420ed23 | 1253 | selinux_netlbl_cache_invalidate(); |
1da177e4 LT |
1254 | return 0; |
1255 | } | |
1256 | ||
1257 | #if 0 | |
1258 | sidtab_hash_eval(&sidtab, "sids"); | |
1259 | #endif | |
1260 | ||
1261 | if (policydb_read(&newpolicydb, fp)) { | |
1262 | LOAD_UNLOCK; | |
1263 | return -EINVAL; | |
1264 | } | |
1265 | ||
1266 | sidtab_init(&newsidtab); | |
1267 | ||
1268 | /* Verify that the existing classes did not change. */ | |
1269 | if (hashtab_map(policydb.p_classes.table, validate_class, &newpolicydb)) { | |
1270 | printk(KERN_ERR "security: the definition of an existing " | |
1271 | "class changed\n"); | |
1272 | rc = -EINVAL; | |
1273 | goto err; | |
1274 | } | |
1275 | ||
1276 | /* Clone the SID table. */ | |
1277 | sidtab_shutdown(&sidtab); | |
1278 | if (sidtab_map(&sidtab, clone_sid, &newsidtab)) { | |
1279 | rc = -ENOMEM; | |
1280 | goto err; | |
1281 | } | |
1282 | ||
1283 | /* Convert the internal representations of contexts | |
1284 | in the new SID table and remove invalid SIDs. */ | |
1285 | args.oldp = &policydb; | |
1286 | args.newp = &newpolicydb; | |
1287 | sidtab_map_remove_on_error(&newsidtab, convert_context, &args); | |
1288 | ||
1289 | /* Save the old policydb and SID table to free later. */ | |
1290 | memcpy(&oldpolicydb, &policydb, sizeof policydb); | |
1291 | sidtab_set(&oldsidtab, &sidtab); | |
1292 | ||
1293 | /* Install the new policydb and SID table. */ | |
1294 | POLICY_WRLOCK; | |
1295 | memcpy(&policydb, &newpolicydb, sizeof policydb); | |
1296 | sidtab_set(&sidtab, &newsidtab); | |
1297 | seqno = ++latest_granting; | |
1298 | policydb_loaded_version = policydb.policyvers; | |
1299 | POLICY_WRUNLOCK; | |
1300 | LOAD_UNLOCK; | |
1301 | ||
1302 | /* Free the old policydb and SID table. */ | |
1303 | policydb_destroy(&oldpolicydb); | |
1304 | sidtab_destroy(&oldsidtab); | |
1305 | ||
1306 | avc_ss_reset(seqno); | |
1307 | selnl_notify_policyload(seqno); | |
7420ed23 | 1308 | selinux_netlbl_cache_invalidate(); |
1da177e4 LT |
1309 | |
1310 | return 0; | |
1311 | ||
1312 | err: | |
1313 | LOAD_UNLOCK; | |
1314 | sidtab_destroy(&newsidtab); | |
1315 | policydb_destroy(&newpolicydb); | |
1316 | return rc; | |
1317 | ||
1318 | } | |
1319 | ||
1320 | /** | |
1321 | * security_port_sid - Obtain the SID for a port. | |
1322 | * @domain: communication domain aka address family | |
1323 | * @type: socket type | |
1324 | * @protocol: protocol number | |
1325 | * @port: port number | |
1326 | * @out_sid: security identifier | |
1327 | */ | |
1328 | int security_port_sid(u16 domain, | |
1329 | u16 type, | |
1330 | u8 protocol, | |
1331 | u16 port, | |
1332 | u32 *out_sid) | |
1333 | { | |
1334 | struct ocontext *c; | |
1335 | int rc = 0; | |
1336 | ||
1337 | POLICY_RDLOCK; | |
1338 | ||
1339 | c = policydb.ocontexts[OCON_PORT]; | |
1340 | while (c) { | |
1341 | if (c->u.port.protocol == protocol && | |
1342 | c->u.port.low_port <= port && | |
1343 | c->u.port.high_port >= port) | |
1344 | break; | |
1345 | c = c->next; | |
1346 | } | |
1347 | ||
1348 | if (c) { | |
1349 | if (!c->sid[0]) { | |
1350 | rc = sidtab_context_to_sid(&sidtab, | |
1351 | &c->context[0], | |
1352 | &c->sid[0]); | |
1353 | if (rc) | |
1354 | goto out; | |
1355 | } | |
1356 | *out_sid = c->sid[0]; | |
1357 | } else { | |
1358 | *out_sid = SECINITSID_PORT; | |
1359 | } | |
1360 | ||
1361 | out: | |
1362 | POLICY_RDUNLOCK; | |
1363 | return rc; | |
1364 | } | |
1365 | ||
1366 | /** | |
1367 | * security_netif_sid - Obtain the SID for a network interface. | |
1368 | * @name: interface name | |
1369 | * @if_sid: interface SID | |
1370 | * @msg_sid: default SID for received packets | |
1371 | */ | |
1372 | int security_netif_sid(char *name, | |
1373 | u32 *if_sid, | |
1374 | u32 *msg_sid) | |
1375 | { | |
1376 | int rc = 0; | |
1377 | struct ocontext *c; | |
1378 | ||
1379 | POLICY_RDLOCK; | |
1380 | ||
1381 | c = policydb.ocontexts[OCON_NETIF]; | |
1382 | while (c) { | |
1383 | if (strcmp(name, c->u.name) == 0) | |
1384 | break; | |
1385 | c = c->next; | |
1386 | } | |
1387 | ||
1388 | if (c) { | |
1389 | if (!c->sid[0] || !c->sid[1]) { | |
1390 | rc = sidtab_context_to_sid(&sidtab, | |
1391 | &c->context[0], | |
1392 | &c->sid[0]); | |
1393 | if (rc) | |
1394 | goto out; | |
1395 | rc = sidtab_context_to_sid(&sidtab, | |
1396 | &c->context[1], | |
1397 | &c->sid[1]); | |
1398 | if (rc) | |
1399 | goto out; | |
1400 | } | |
1401 | *if_sid = c->sid[0]; | |
1402 | *msg_sid = c->sid[1]; | |
1403 | } else { | |
1404 | *if_sid = SECINITSID_NETIF; | |
1405 | *msg_sid = SECINITSID_NETMSG; | |
1406 | } | |
1407 | ||
1408 | out: | |
1409 | POLICY_RDUNLOCK; | |
1410 | return rc; | |
1411 | } | |
1412 | ||
1413 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
1414 | { | |
1415 | int i, fail = 0; | |
1416 | ||
1417 | for(i = 0; i < 4; i++) | |
1418 | if(addr[i] != (input[i] & mask[i])) { | |
1419 | fail = 1; | |
1420 | break; | |
1421 | } | |
1422 | ||
1423 | return !fail; | |
1424 | } | |
1425 | ||
1426 | /** | |
1427 | * security_node_sid - Obtain the SID for a node (host). | |
1428 | * @domain: communication domain aka address family | |
1429 | * @addrp: address | |
1430 | * @addrlen: address length in bytes | |
1431 | * @out_sid: security identifier | |
1432 | */ | |
1433 | int security_node_sid(u16 domain, | |
1434 | void *addrp, | |
1435 | u32 addrlen, | |
1436 | u32 *out_sid) | |
1437 | { | |
1438 | int rc = 0; | |
1439 | struct ocontext *c; | |
1440 | ||
1441 | POLICY_RDLOCK; | |
1442 | ||
1443 | switch (domain) { | |
1444 | case AF_INET: { | |
1445 | u32 addr; | |
1446 | ||
1447 | if (addrlen != sizeof(u32)) { | |
1448 | rc = -EINVAL; | |
1449 | goto out; | |
1450 | } | |
1451 | ||
1452 | addr = *((u32 *)addrp); | |
1453 | ||
1454 | c = policydb.ocontexts[OCON_NODE]; | |
1455 | while (c) { | |
1456 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
1457 | break; | |
1458 | c = c->next; | |
1459 | } | |
1460 | break; | |
1461 | } | |
1462 | ||
1463 | case AF_INET6: | |
1464 | if (addrlen != sizeof(u64) * 2) { | |
1465 | rc = -EINVAL; | |
1466 | goto out; | |
1467 | } | |
1468 | c = policydb.ocontexts[OCON_NODE6]; | |
1469 | while (c) { | |
1470 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
1471 | c->u.node6.mask)) | |
1472 | break; | |
1473 | c = c->next; | |
1474 | } | |
1475 | break; | |
1476 | ||
1477 | default: | |
1478 | *out_sid = SECINITSID_NODE; | |
1479 | goto out; | |
1480 | } | |
1481 | ||
1482 | if (c) { | |
1483 | if (!c->sid[0]) { | |
1484 | rc = sidtab_context_to_sid(&sidtab, | |
1485 | &c->context[0], | |
1486 | &c->sid[0]); | |
1487 | if (rc) | |
1488 | goto out; | |
1489 | } | |
1490 | *out_sid = c->sid[0]; | |
1491 | } else { | |
1492 | *out_sid = SECINITSID_NODE; | |
1493 | } | |
1494 | ||
1495 | out: | |
1496 | POLICY_RDUNLOCK; | |
1497 | return rc; | |
1498 | } | |
1499 | ||
1500 | #define SIDS_NEL 25 | |
1501 | ||
1502 | /** | |
1503 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
1504 | * @fromsid: starting SID | |
1505 | * @username: username | |
1506 | * @sids: array of reachable SIDs for user | |
1507 | * @nel: number of elements in @sids | |
1508 | * | |
1509 | * Generate the set of SIDs for legal security contexts | |
1510 | * for a given user that can be reached by @fromsid. | |
1511 | * Set *@sids to point to a dynamically allocated | |
1512 | * array containing the set of SIDs. Set *@nel to the | |
1513 | * number of elements in the array. | |
1514 | */ | |
1515 | ||
1516 | int security_get_user_sids(u32 fromsid, | |
1517 | char *username, | |
1518 | u32 **sids, | |
1519 | u32 *nel) | |
1520 | { | |
1521 | struct context *fromcon, usercon; | |
1522 | u32 *mysids, *mysids2, sid; | |
1523 | u32 mynel = 0, maxnel = SIDS_NEL; | |
1524 | struct user_datum *user; | |
1525 | struct role_datum *role; | |
1526 | struct av_decision avd; | |
782ebb99 | 1527 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
1528 | int rc = 0, i, j; |
1529 | ||
1530 | if (!ss_initialized) { | |
1531 | *sids = NULL; | |
1532 | *nel = 0; | |
1533 | goto out; | |
1534 | } | |
1535 | ||
1536 | POLICY_RDLOCK; | |
1537 | ||
1538 | fromcon = sidtab_search(&sidtab, fromsid); | |
1539 | if (!fromcon) { | |
1540 | rc = -EINVAL; | |
1541 | goto out_unlock; | |
1542 | } | |
1543 | ||
1544 | user = hashtab_search(policydb.p_users.table, username); | |
1545 | if (!user) { | |
1546 | rc = -EINVAL; | |
1547 | goto out_unlock; | |
1548 | } | |
1549 | usercon.user = user->value; | |
1550 | ||
89d155ef | 1551 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
1da177e4 LT |
1552 | if (!mysids) { |
1553 | rc = -ENOMEM; | |
1554 | goto out_unlock; | |
1555 | } | |
1da177e4 | 1556 | |
782ebb99 SS |
1557 | ebitmap_for_each_bit(&user->roles, rnode, i) { |
1558 | if (!ebitmap_node_get_bit(rnode, i)) | |
1da177e4 LT |
1559 | continue; |
1560 | role = policydb.role_val_to_struct[i]; | |
1561 | usercon.role = i+1; | |
782ebb99 SS |
1562 | ebitmap_for_each_bit(&role->types, tnode, j) { |
1563 | if (!ebitmap_node_get_bit(tnode, j)) | |
1da177e4 LT |
1564 | continue; |
1565 | usercon.type = j+1; | |
1566 | ||
1567 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
1568 | continue; | |
1569 | ||
1570 | rc = context_struct_compute_av(fromcon, &usercon, | |
1571 | SECCLASS_PROCESS, | |
1572 | PROCESS__TRANSITION, | |
1573 | &avd); | |
1574 | if (rc || !(avd.allowed & PROCESS__TRANSITION)) | |
1575 | continue; | |
1576 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); | |
1577 | if (rc) { | |
1578 | kfree(mysids); | |
1579 | goto out_unlock; | |
1580 | } | |
1581 | if (mynel < maxnel) { | |
1582 | mysids[mynel++] = sid; | |
1583 | } else { | |
1584 | maxnel += SIDS_NEL; | |
89d155ef | 1585 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
1da177e4 LT |
1586 | if (!mysids2) { |
1587 | rc = -ENOMEM; | |
1588 | kfree(mysids); | |
1589 | goto out_unlock; | |
1590 | } | |
1da177e4 LT |
1591 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
1592 | kfree(mysids); | |
1593 | mysids = mysids2; | |
1594 | mysids[mynel++] = sid; | |
1595 | } | |
1596 | } | |
1597 | } | |
1598 | ||
1599 | *sids = mysids; | |
1600 | *nel = mynel; | |
1601 | ||
1602 | out_unlock: | |
1603 | POLICY_RDUNLOCK; | |
1604 | out: | |
1605 | return rc; | |
1606 | } | |
1607 | ||
1608 | /** | |
1609 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
1610 | * @fstype: filesystem type | |
1611 | * @path: path from root of mount | |
1612 | * @sclass: file security class | |
1613 | * @sid: SID for path | |
1614 | * | |
1615 | * Obtain a SID to use for a file in a filesystem that | |
1616 | * cannot support xattr or use a fixed labeling behavior like | |
1617 | * transition SIDs or task SIDs. | |
1618 | */ | |
1619 | int security_genfs_sid(const char *fstype, | |
1620 | char *path, | |
1621 | u16 sclass, | |
1622 | u32 *sid) | |
1623 | { | |
1624 | int len; | |
1625 | struct genfs *genfs; | |
1626 | struct ocontext *c; | |
1627 | int rc = 0, cmp = 0; | |
1628 | ||
1629 | POLICY_RDLOCK; | |
1630 | ||
1631 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { | |
1632 | cmp = strcmp(fstype, genfs->fstype); | |
1633 | if (cmp <= 0) | |
1634 | break; | |
1635 | } | |
1636 | ||
1637 | if (!genfs || cmp) { | |
1638 | *sid = SECINITSID_UNLABELED; | |
1639 | rc = -ENOENT; | |
1640 | goto out; | |
1641 | } | |
1642 | ||
1643 | for (c = genfs->head; c; c = c->next) { | |
1644 | len = strlen(c->u.name); | |
1645 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
1646 | (strncmp(c->u.name, path, len) == 0)) | |
1647 | break; | |
1648 | } | |
1649 | ||
1650 | if (!c) { | |
1651 | *sid = SECINITSID_UNLABELED; | |
1652 | rc = -ENOENT; | |
1653 | goto out; | |
1654 | } | |
1655 | ||
1656 | if (!c->sid[0]) { | |
1657 | rc = sidtab_context_to_sid(&sidtab, | |
1658 | &c->context[0], | |
1659 | &c->sid[0]); | |
1660 | if (rc) | |
1661 | goto out; | |
1662 | } | |
1663 | ||
1664 | *sid = c->sid[0]; | |
1665 | out: | |
1666 | POLICY_RDUNLOCK; | |
1667 | return rc; | |
1668 | } | |
1669 | ||
1670 | /** | |
1671 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
1672 | * @fstype: filesystem type | |
1673 | * @behavior: labeling behavior | |
1674 | * @sid: SID for filesystem (superblock) | |
1675 | */ | |
1676 | int security_fs_use( | |
1677 | const char *fstype, | |
1678 | unsigned int *behavior, | |
1679 | u32 *sid) | |
1680 | { | |
1681 | int rc = 0; | |
1682 | struct ocontext *c; | |
1683 | ||
1684 | POLICY_RDLOCK; | |
1685 | ||
1686 | c = policydb.ocontexts[OCON_FSUSE]; | |
1687 | while (c) { | |
1688 | if (strcmp(fstype, c->u.name) == 0) | |
1689 | break; | |
1690 | c = c->next; | |
1691 | } | |
1692 | ||
1693 | if (c) { | |
1694 | *behavior = c->v.behavior; | |
1695 | if (!c->sid[0]) { | |
1696 | rc = sidtab_context_to_sid(&sidtab, | |
1697 | &c->context[0], | |
1698 | &c->sid[0]); | |
1699 | if (rc) | |
1700 | goto out; | |
1701 | } | |
1702 | *sid = c->sid[0]; | |
1703 | } else { | |
1704 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); | |
1705 | if (rc) { | |
1706 | *behavior = SECURITY_FS_USE_NONE; | |
1707 | rc = 0; | |
1708 | } else { | |
1709 | *behavior = SECURITY_FS_USE_GENFS; | |
1710 | } | |
1711 | } | |
1712 | ||
1713 | out: | |
1714 | POLICY_RDUNLOCK; | |
1715 | return rc; | |
1716 | } | |
1717 | ||
1718 | int security_get_bools(int *len, char ***names, int **values) | |
1719 | { | |
1720 | int i, rc = -ENOMEM; | |
1721 | ||
1722 | POLICY_RDLOCK; | |
1723 | *names = NULL; | |
1724 | *values = NULL; | |
1725 | ||
1726 | *len = policydb.p_bools.nprim; | |
1727 | if (!*len) { | |
1728 | rc = 0; | |
1729 | goto out; | |
1730 | } | |
1731 | ||
e0795cf4 | 1732 | *names = kcalloc(*len, sizeof(char*), GFP_ATOMIC); |
1da177e4 LT |
1733 | if (!*names) |
1734 | goto err; | |
1da177e4 | 1735 | |
e0795cf4 | 1736 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); |
1da177e4 LT |
1737 | if (!*values) |
1738 | goto err; | |
1739 | ||
1740 | for (i = 0; i < *len; i++) { | |
1741 | size_t name_len; | |
1742 | (*values)[i] = policydb.bool_val_to_struct[i]->state; | |
1743 | name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; | |
e0795cf4 | 1744 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); |
1da177e4 LT |
1745 | if (!(*names)[i]) |
1746 | goto err; | |
1747 | strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); | |
1748 | (*names)[i][name_len - 1] = 0; | |
1749 | } | |
1750 | rc = 0; | |
1751 | out: | |
1752 | POLICY_RDUNLOCK; | |
1753 | return rc; | |
1754 | err: | |
1755 | if (*names) { | |
1756 | for (i = 0; i < *len; i++) | |
9a5f04bf | 1757 | kfree((*names)[i]); |
1da177e4 | 1758 | } |
9a5f04bf | 1759 | kfree(*values); |
1da177e4 LT |
1760 | goto out; |
1761 | } | |
1762 | ||
1763 | ||
1764 | int security_set_bools(int len, int *values) | |
1765 | { | |
1766 | int i, rc = 0; | |
1767 | int lenp, seqno = 0; | |
1768 | struct cond_node *cur; | |
1769 | ||
1770 | POLICY_WRLOCK; | |
1771 | ||
1772 | lenp = policydb.p_bools.nprim; | |
1773 | if (len != lenp) { | |
1774 | rc = -EFAULT; | |
1775 | goto out; | |
1776 | } | |
1777 | ||
1da177e4 | 1778 | for (i = 0; i < len; i++) { |
af601e46 SG |
1779 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
1780 | audit_log(current->audit_context, GFP_ATOMIC, | |
1781 | AUDIT_MAC_CONFIG_CHANGE, | |
1782 | "bool=%s val=%d old_val=%d auid=%u", | |
1783 | policydb.p_bool_val_to_name[i], | |
1784 | !!values[i], | |
1785 | policydb.bool_val_to_struct[i]->state, | |
1786 | audit_get_loginuid(current->audit_context)); | |
1787 | } | |
1da177e4 LT |
1788 | if (values[i]) { |
1789 | policydb.bool_val_to_struct[i]->state = 1; | |
1790 | } else { | |
1791 | policydb.bool_val_to_struct[i]->state = 0; | |
1792 | } | |
1da177e4 | 1793 | } |
1da177e4 LT |
1794 | |
1795 | for (cur = policydb.cond_list; cur != NULL; cur = cur->next) { | |
1796 | rc = evaluate_cond_node(&policydb, cur); | |
1797 | if (rc) | |
1798 | goto out; | |
1799 | } | |
1800 | ||
1801 | seqno = ++latest_granting; | |
1802 | ||
1803 | out: | |
1804 | POLICY_WRUNLOCK; | |
1805 | if (!rc) { | |
1806 | avc_ss_reset(seqno); | |
1807 | selnl_notify_policyload(seqno); | |
1808 | } | |
1809 | return rc; | |
1810 | } | |
1811 | ||
1812 | int security_get_bool_value(int bool) | |
1813 | { | |
1814 | int rc = 0; | |
1815 | int len; | |
1816 | ||
1817 | POLICY_RDLOCK; | |
1818 | ||
1819 | len = policydb.p_bools.nprim; | |
1820 | if (bool >= len) { | |
1821 | rc = -EFAULT; | |
1822 | goto out; | |
1823 | } | |
1824 | ||
1825 | rc = policydb.bool_val_to_struct[bool]->state; | |
1826 | out: | |
1827 | POLICY_RDUNLOCK; | |
1828 | return rc; | |
1829 | } | |
376bd9cb | 1830 | |
08554d6b VY |
1831 | /* |
1832 | * security_sid_mls_copy() - computes a new sid based on the given | |
1833 | * sid and the mls portion of mls_sid. | |
1834 | */ | |
1835 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
1836 | { | |
1837 | struct context *context1; | |
1838 | struct context *context2; | |
1839 | struct context newcon; | |
1840 | char *s; | |
1841 | u32 len; | |
1842 | int rc = 0; | |
1843 | ||
4eb327b5 | 1844 | if (!ss_initialized || !selinux_mls_enabled) { |
08554d6b VY |
1845 | *new_sid = sid; |
1846 | goto out; | |
1847 | } | |
1848 | ||
1849 | context_init(&newcon); | |
1850 | ||
1851 | POLICY_RDLOCK; | |
1852 | context1 = sidtab_search(&sidtab, sid); | |
1853 | if (!context1) { | |
1854 | printk(KERN_ERR "security_sid_mls_copy: unrecognized SID " | |
1855 | "%d\n", sid); | |
1856 | rc = -EINVAL; | |
1857 | goto out_unlock; | |
1858 | } | |
1859 | ||
1860 | context2 = sidtab_search(&sidtab, mls_sid); | |
1861 | if (!context2) { | |
1862 | printk(KERN_ERR "security_sid_mls_copy: unrecognized SID " | |
1863 | "%d\n", mls_sid); | |
1864 | rc = -EINVAL; | |
1865 | goto out_unlock; | |
1866 | } | |
1867 | ||
1868 | newcon.user = context1->user; | |
1869 | newcon.role = context1->role; | |
1870 | newcon.type = context1->type; | |
1871 | rc = mls_copy_context(&newcon, context2); | |
1872 | if (rc) | |
1873 | goto out_unlock; | |
1874 | ||
1875 | ||
1876 | /* Check the validity of the new context. */ | |
1877 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
1878 | rc = convert_context_handle_invalid_context(&newcon); | |
1879 | if (rc) | |
1880 | goto bad; | |
1881 | } | |
1882 | ||
1883 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
1884 | goto out_unlock; | |
1885 | ||
1886 | bad: | |
1887 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
1888 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
1889 | "security_sid_mls_copy: invalid context %s", s); | |
1890 | kfree(s); | |
1891 | } | |
1892 | ||
1893 | out_unlock: | |
1894 | POLICY_RDUNLOCK; | |
1895 | context_destroy(&newcon); | |
1896 | out: | |
1897 | return rc; | |
1898 | } | |
1899 | ||
376bd9cb DG |
1900 | struct selinux_audit_rule { |
1901 | u32 au_seqno; | |
1902 | struct context au_ctxt; | |
1903 | }; | |
1904 | ||
1905 | void selinux_audit_rule_free(struct selinux_audit_rule *rule) | |
1906 | { | |
1907 | if (rule) { | |
1908 | context_destroy(&rule->au_ctxt); | |
1909 | kfree(rule); | |
1910 | } | |
1911 | } | |
1912 | ||
1913 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, | |
1914 | struct selinux_audit_rule **rule) | |
1915 | { | |
1916 | struct selinux_audit_rule *tmprule; | |
1917 | struct role_datum *roledatum; | |
1918 | struct type_datum *typedatum; | |
1919 | struct user_datum *userdatum; | |
1920 | int rc = 0; | |
1921 | ||
1922 | *rule = NULL; | |
1923 | ||
1924 | if (!ss_initialized) | |
1925 | return -ENOTSUPP; | |
1926 | ||
1927 | switch (field) { | |
3a6b9f85 DG |
1928 | case AUDIT_SUBJ_USER: |
1929 | case AUDIT_SUBJ_ROLE: | |
1930 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
1931 | case AUDIT_OBJ_USER: |
1932 | case AUDIT_OBJ_ROLE: | |
1933 | case AUDIT_OBJ_TYPE: | |
376bd9cb DG |
1934 | /* only 'equals' and 'not equals' fit user, role, and type */ |
1935 | if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL) | |
1936 | return -EINVAL; | |
1937 | break; | |
3a6b9f85 DG |
1938 | case AUDIT_SUBJ_SEN: |
1939 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
1940 | case AUDIT_OBJ_LEV_LOW: |
1941 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
1942 | /* we do not allow a range, indicated by the presense of '-' */ |
1943 | if (strchr(rulestr, '-')) | |
1944 | return -EINVAL; | |
1945 | break; | |
1946 | default: | |
1947 | /* only the above fields are valid */ | |
1948 | return -EINVAL; | |
1949 | } | |
1950 | ||
1951 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
1952 | if (!tmprule) | |
1953 | return -ENOMEM; | |
1954 | ||
1955 | context_init(&tmprule->au_ctxt); | |
1956 | ||
1957 | POLICY_RDLOCK; | |
1958 | ||
1959 | tmprule->au_seqno = latest_granting; | |
1960 | ||
1961 | switch (field) { | |
3a6b9f85 | 1962 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 1963 | case AUDIT_OBJ_USER: |
376bd9cb DG |
1964 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
1965 | if (!userdatum) | |
1966 | rc = -EINVAL; | |
1967 | else | |
1968 | tmprule->au_ctxt.user = userdatum->value; | |
1969 | break; | |
3a6b9f85 | 1970 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 1971 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
1972 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
1973 | if (!roledatum) | |
1974 | rc = -EINVAL; | |
1975 | else | |
1976 | tmprule->au_ctxt.role = roledatum->value; | |
1977 | break; | |
3a6b9f85 | 1978 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 1979 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
1980 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
1981 | if (!typedatum) | |
1982 | rc = -EINVAL; | |
1983 | else | |
1984 | tmprule->au_ctxt.type = typedatum->value; | |
1985 | break; | |
3a6b9f85 DG |
1986 | case AUDIT_SUBJ_SEN: |
1987 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
1988 | case AUDIT_OBJ_LEV_LOW: |
1989 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
1990 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
1991 | break; | |
1992 | } | |
1993 | ||
1994 | POLICY_RDUNLOCK; | |
1995 | ||
1996 | if (rc) { | |
1997 | selinux_audit_rule_free(tmprule); | |
1998 | tmprule = NULL; | |
1999 | } | |
2000 | ||
2001 | *rule = tmprule; | |
2002 | ||
2003 | return rc; | |
2004 | } | |
2005 | ||
9a2f44f0 | 2006 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, |
376bd9cb DG |
2007 | struct selinux_audit_rule *rule, |
2008 | struct audit_context *actx) | |
2009 | { | |
2010 | struct context *ctxt; | |
2011 | struct mls_level *level; | |
2012 | int match = 0; | |
2013 | ||
2014 | if (!rule) { | |
2015 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2016 | "selinux_audit_rule_match: missing rule\n"); | |
2017 | return -ENOENT; | |
2018 | } | |
2019 | ||
2020 | POLICY_RDLOCK; | |
2021 | ||
2022 | if (rule->au_seqno < latest_granting) { | |
2023 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2024 | "selinux_audit_rule_match: stale rule\n"); | |
2025 | match = -ESTALE; | |
2026 | goto out; | |
2027 | } | |
2028 | ||
9a2f44f0 | 2029 | ctxt = sidtab_search(&sidtab, sid); |
376bd9cb DG |
2030 | if (!ctxt) { |
2031 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2032 | "selinux_audit_rule_match: unrecognized SID %d\n", | |
9a2f44f0 | 2033 | sid); |
376bd9cb DG |
2034 | match = -ENOENT; |
2035 | goto out; | |
2036 | } | |
2037 | ||
2038 | /* a field/op pair that is not caught here will simply fall through | |
2039 | without a match */ | |
2040 | switch (field) { | |
3a6b9f85 | 2041 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2042 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2043 | switch (op) { |
2044 | case AUDIT_EQUAL: | |
2045 | match = (ctxt->user == rule->au_ctxt.user); | |
2046 | break; | |
2047 | case AUDIT_NOT_EQUAL: | |
2048 | match = (ctxt->user != rule->au_ctxt.user); | |
2049 | break; | |
2050 | } | |
2051 | break; | |
3a6b9f85 | 2052 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2053 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2054 | switch (op) { |
2055 | case AUDIT_EQUAL: | |
2056 | match = (ctxt->role == rule->au_ctxt.role); | |
2057 | break; | |
2058 | case AUDIT_NOT_EQUAL: | |
2059 | match = (ctxt->role != rule->au_ctxt.role); | |
2060 | break; | |
2061 | } | |
2062 | break; | |
3a6b9f85 | 2063 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2064 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2065 | switch (op) { |
2066 | case AUDIT_EQUAL: | |
2067 | match = (ctxt->type == rule->au_ctxt.type); | |
2068 | break; | |
2069 | case AUDIT_NOT_EQUAL: | |
2070 | match = (ctxt->type != rule->au_ctxt.type); | |
2071 | break; | |
2072 | } | |
2073 | break; | |
3a6b9f85 DG |
2074 | case AUDIT_SUBJ_SEN: |
2075 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2076 | case AUDIT_OBJ_LEV_LOW: |
2077 | case AUDIT_OBJ_LEV_HIGH: | |
2078 | level = ((field == AUDIT_SUBJ_SEN || | |
2079 | field == AUDIT_OBJ_LEV_LOW) ? | |
376bd9cb DG |
2080 | &ctxt->range.level[0] : &ctxt->range.level[1]); |
2081 | switch (op) { | |
2082 | case AUDIT_EQUAL: | |
2083 | match = mls_level_eq(&rule->au_ctxt.range.level[0], | |
2084 | level); | |
2085 | break; | |
2086 | case AUDIT_NOT_EQUAL: | |
2087 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2088 | level); | |
2089 | break; | |
2090 | case AUDIT_LESS_THAN: | |
2091 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], | |
2092 | level) && | |
2093 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2094 | level)); | |
2095 | break; | |
2096 | case AUDIT_LESS_THAN_OR_EQUAL: | |
2097 | match = mls_level_dom(&rule->au_ctxt.range.level[0], | |
2098 | level); | |
2099 | break; | |
2100 | case AUDIT_GREATER_THAN: | |
2101 | match = (mls_level_dom(level, | |
2102 | &rule->au_ctxt.range.level[0]) && | |
2103 | !mls_level_eq(level, | |
2104 | &rule->au_ctxt.range.level[0])); | |
2105 | break; | |
2106 | case AUDIT_GREATER_THAN_OR_EQUAL: | |
2107 | match = mls_level_dom(level, | |
2108 | &rule->au_ctxt.range.level[0]); | |
2109 | break; | |
2110 | } | |
2111 | } | |
2112 | ||
2113 | out: | |
2114 | POLICY_RDUNLOCK; | |
2115 | return match; | |
2116 | } | |
2117 | ||
2118 | static int (*aurule_callback)(void) = NULL; | |
2119 | ||
2120 | static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid, | |
2121 | u16 class, u32 perms, u32 *retained) | |
2122 | { | |
2123 | int err = 0; | |
2124 | ||
2125 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
2126 | err = aurule_callback(); | |
2127 | return err; | |
2128 | } | |
2129 | ||
2130 | static int __init aurule_init(void) | |
2131 | { | |
2132 | int err; | |
2133 | ||
2134 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET, | |
2135 | SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0); | |
2136 | if (err) | |
2137 | panic("avc_add_callback() failed, error %d\n", err); | |
2138 | ||
2139 | return err; | |
2140 | } | |
2141 | __initcall(aurule_init); | |
2142 | ||
2143 | void selinux_audit_set_callback(int (*callback)(void)) | |
2144 | { | |
2145 | aurule_callback = callback; | |
2146 | } | |
7420ed23 VY |
2147 | |
2148 | #ifdef CONFIG_NETLABEL | |
2149 | /* | |
2150 | * This is the structure we store inside the NetLabel cache block. | |
2151 | */ | |
2152 | #define NETLBL_CACHE(x) ((struct netlbl_cache *)(x)) | |
2153 | #define NETLBL_CACHE_T_NONE 0 | |
2154 | #define NETLBL_CACHE_T_SID 1 | |
2155 | #define NETLBL_CACHE_T_MLS 2 | |
2156 | struct netlbl_cache { | |
2157 | u32 type; | |
2158 | union { | |
2159 | u32 sid; | |
2160 | struct mls_range mls_label; | |
2161 | } data; | |
2162 | }; | |
2163 | ||
2164 | /** | |
2165 | * selinux_netlbl_cache_free - Free the NetLabel cached data | |
2166 | * @data: the data to free | |
2167 | * | |
2168 | * Description: | |
2169 | * This function is intended to be used as the free() callback inside the | |
2170 | * netlbl_lsm_cache structure. | |
2171 | * | |
2172 | */ | |
2173 | static void selinux_netlbl_cache_free(const void *data) | |
2174 | { | |
ffb733c6 | 2175 | struct netlbl_cache *cache; |
2176 | ||
2177 | if (data == NULL) | |
2178 | return; | |
2179 | ||
2180 | cache = NETLBL_CACHE(data); | |
7420ed23 VY |
2181 | switch (cache->type) { |
2182 | case NETLBL_CACHE_T_MLS: | |
2183 | ebitmap_destroy(&cache->data.mls_label.level[0].cat); | |
2184 | break; | |
2185 | } | |
2186 | kfree(data); | |
2187 | } | |
2188 | ||
2189 | /** | |
2190 | * selinux_netlbl_cache_add - Add an entry to the NetLabel cache | |
2191 | * @skb: the packet | |
2192 | * @ctx: the SELinux context | |
2193 | * | |
2194 | * Description: | |
2195 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
2196 | * @skb, in the NetLabel subsystem cache. | |
2197 | * | |
2198 | */ | |
2199 | static void selinux_netlbl_cache_add(struct sk_buff *skb, struct context *ctx) | |
2200 | { | |
2201 | struct netlbl_cache *cache = NULL; | |
2202 | struct netlbl_lsm_secattr secattr; | |
2203 | ||
2204 | netlbl_secattr_init(&secattr); | |
ffb733c6 | 2205 | secattr.cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
2206 | if (secattr.cache == NULL) | |
2207 | goto netlbl_cache_add_return; | |
7420ed23 VY |
2208 | |
2209 | cache = kzalloc(sizeof(*cache), GFP_ATOMIC); | |
2210 | if (cache == NULL) | |
ffb733c6 | 2211 | goto netlbl_cache_add_return; |
2212 | secattr.cache->free = selinux_netlbl_cache_free; | |
2213 | secattr.cache->data = (void *)cache; | |
7420ed23 VY |
2214 | |
2215 | cache->type = NETLBL_CACHE_T_MLS; | |
2216 | if (ebitmap_cpy(&cache->data.mls_label.level[0].cat, | |
2217 | &ctx->range.level[0].cat) != 0) | |
ffb733c6 | 2218 | goto netlbl_cache_add_return; |
7420ed23 VY |
2219 | cache->data.mls_label.level[1].cat.highbit = |
2220 | cache->data.mls_label.level[0].cat.highbit; | |
2221 | cache->data.mls_label.level[1].cat.node = | |
2222 | cache->data.mls_label.level[0].cat.node; | |
2223 | cache->data.mls_label.level[0].sens = ctx->range.level[0].sens; | |
2224 | cache->data.mls_label.level[1].sens = ctx->range.level[0].sens; | |
2225 | ||
ffb733c6 | 2226 | netlbl_cache_add(skb, &secattr); |
7420ed23 | 2227 | |
ffb733c6 | 2228 | netlbl_cache_add_return: |
2229 | netlbl_secattr_destroy(&secattr); | |
7420ed23 VY |
2230 | } |
2231 | ||
2232 | /** | |
2233 | * selinux_netlbl_cache_invalidate - Invalidate the NetLabel cache | |
2234 | * | |
2235 | * Description: | |
2236 | * Invalidate the NetLabel security attribute mapping cache. | |
2237 | * | |
2238 | */ | |
2239 | void selinux_netlbl_cache_invalidate(void) | |
2240 | { | |
2241 | netlbl_cache_invalidate(); | |
2242 | } | |
2243 | ||
2244 | /** | |
2245 | * selinux_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID | |
2246 | * @skb: the network packet | |
2247 | * @secattr: the NetLabel packet security attributes | |
2248 | * @base_sid: the SELinux SID to use as a context for MLS only attributes | |
2249 | * @sid: the SELinux SID | |
2250 | * | |
2251 | * Description: | |
2252 | * Convert the given NetLabel packet security attributes in @secattr into a | |
2253 | * SELinux SID. If the @secattr field does not contain a full SELinux | |
2254 | * SID/context then use the context in @base_sid as the foundation. If @skb | |
2255 | * is not NULL attempt to cache as much data as possibile. Returns zero on | |
2256 | * success, negative values on failure. | |
2257 | * | |
2258 | */ | |
2259 | static int selinux_netlbl_secattr_to_sid(struct sk_buff *skb, | |
2260 | struct netlbl_lsm_secattr *secattr, | |
2261 | u32 base_sid, | |
2262 | u32 *sid) | |
2263 | { | |
2264 | int rc = -EIDRM; | |
2265 | struct context *ctx; | |
2266 | struct context ctx_new; | |
2267 | struct netlbl_cache *cache; | |
2268 | ||
2269 | POLICY_RDLOCK; | |
2270 | ||
ffb733c6 | 2271 | if (secattr->cache) { |
2272 | cache = NETLBL_CACHE(secattr->cache->data); | |
7420ed23 VY |
2273 | switch (cache->type) { |
2274 | case NETLBL_CACHE_T_SID: | |
2275 | *sid = cache->data.sid; | |
2276 | rc = 0; | |
2277 | break; | |
2278 | case NETLBL_CACHE_T_MLS: | |
2279 | ctx = sidtab_search(&sidtab, base_sid); | |
2280 | if (ctx == NULL) | |
2281 | goto netlbl_secattr_to_sid_return; | |
2282 | ||
2283 | ctx_new.user = ctx->user; | |
2284 | ctx_new.role = ctx->role; | |
2285 | ctx_new.type = ctx->type; | |
2286 | ctx_new.range.level[0].sens = | |
2287 | cache->data.mls_label.level[0].sens; | |
2288 | ctx_new.range.level[0].cat.highbit = | |
2289 | cache->data.mls_label.level[0].cat.highbit; | |
2290 | ctx_new.range.level[0].cat.node = | |
2291 | cache->data.mls_label.level[0].cat.node; | |
2292 | ctx_new.range.level[1].sens = | |
2293 | cache->data.mls_label.level[1].sens; | |
2294 | ctx_new.range.level[1].cat.highbit = | |
2295 | cache->data.mls_label.level[1].cat.highbit; | |
2296 | ctx_new.range.level[1].cat.node = | |
2297 | cache->data.mls_label.level[1].cat.node; | |
2298 | ||
2299 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
2300 | break; | |
2301 | default: | |
2302 | goto netlbl_secattr_to_sid_return; | |
2303 | } | |
2304 | } else if (secattr->mls_lvl_vld) { | |
2305 | ctx = sidtab_search(&sidtab, base_sid); | |
2306 | if (ctx == NULL) | |
2307 | goto netlbl_secattr_to_sid_return; | |
2308 | ||
2309 | ctx_new.user = ctx->user; | |
2310 | ctx_new.role = ctx->role; | |
2311 | ctx_new.type = ctx->type; | |
2312 | mls_import_lvl(&ctx_new, secattr->mls_lvl, secattr->mls_lvl); | |
2313 | if (secattr->mls_cat) { | |
2314 | if (mls_import_cat(&ctx_new, | |
2315 | secattr->mls_cat, | |
2316 | secattr->mls_cat_len, | |
2317 | NULL, | |
2318 | 0) != 0) | |
2319 | goto netlbl_secattr_to_sid_return; | |
2320 | ctx_new.range.level[1].cat.highbit = | |
2321 | ctx_new.range.level[0].cat.highbit; | |
2322 | ctx_new.range.level[1].cat.node = | |
2323 | ctx_new.range.level[0].cat.node; | |
2324 | } else { | |
2325 | ebitmap_init(&ctx_new.range.level[0].cat); | |
2326 | ebitmap_init(&ctx_new.range.level[1].cat); | |
2327 | } | |
2328 | if (mls_context_isvalid(&policydb, &ctx_new) != 1) | |
2329 | goto netlbl_secattr_to_sid_return_cleanup; | |
2330 | ||
2331 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
2332 | if (rc != 0) | |
2333 | goto netlbl_secattr_to_sid_return_cleanup; | |
2334 | ||
2335 | if (skb != NULL) | |
2336 | selinux_netlbl_cache_add(skb, &ctx_new); | |
2337 | ebitmap_destroy(&ctx_new.range.level[0].cat); | |
2338 | } else { | |
388b2405 | 2339 | *sid = SECSID_NULL; |
7420ed23 VY |
2340 | rc = 0; |
2341 | } | |
2342 | ||
2343 | netlbl_secattr_to_sid_return: | |
2344 | POLICY_RDUNLOCK; | |
2345 | return rc; | |
2346 | netlbl_secattr_to_sid_return_cleanup: | |
2347 | ebitmap_destroy(&ctx_new.range.level[0].cat); | |
2348 | goto netlbl_secattr_to_sid_return; | |
2349 | } | |
2350 | ||
2351 | /** | |
2352 | * selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel | |
2353 | * @skb: the packet | |
2354 | * @base_sid: the SELinux SID to use as a context for MLS only attributes | |
2355 | * @sid: the SID | |
2356 | * | |
2357 | * Description: | |
2358 | * Call the NetLabel mechanism to get the security attributes of the given | |
2359 | * packet and use those attributes to determine the correct context/SID to | |
2360 | * assign to the packet. Returns zero on success, negative values on failure. | |
2361 | * | |
2362 | */ | |
2363 | static int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, | |
2364 | u32 base_sid, | |
2365 | u32 *sid) | |
2366 | { | |
2367 | int rc; | |
2368 | struct netlbl_lsm_secattr secattr; | |
2369 | ||
2370 | netlbl_secattr_init(&secattr); | |
2371 | rc = netlbl_skbuff_getattr(skb, &secattr); | |
2372 | if (rc == 0) | |
2373 | rc = selinux_netlbl_secattr_to_sid(skb, | |
2374 | &secattr, | |
2375 | base_sid, | |
2376 | sid); | |
ffb733c6 | 2377 | netlbl_secattr_destroy(&secattr); |
7420ed23 VY |
2378 | |
2379 | return rc; | |
2380 | } | |
2381 | ||
2382 | /** | |
2383 | * selinux_netlbl_socket_setsid - Label a socket using the NetLabel mechanism | |
2384 | * @sock: the socket to label | |
2385 | * @sid: the SID to use | |
2386 | * | |
2387 | * Description: | |
2388 | * Attempt to label a socket using the NetLabel mechanism using the given | |
2389 | * SID. Returns zero values on success, negative values on failure. | |
2390 | * | |
2391 | */ | |
2392 | static int selinux_netlbl_socket_setsid(struct socket *sock, u32 sid) | |
2393 | { | |
2394 | int rc = -ENOENT; | |
2395 | struct sk_security_struct *sksec = sock->sk->sk_security; | |
2396 | struct netlbl_lsm_secattr secattr; | |
2397 | struct context *ctx; | |
2398 | ||
2399 | if (!ss_initialized) | |
2400 | return 0; | |
2401 | ||
bf0edf39 PM |
2402 | netlbl_secattr_init(&secattr); |
2403 | ||
7420ed23 VY |
2404 | POLICY_RDLOCK; |
2405 | ||
2406 | ctx = sidtab_search(&sidtab, sid); | |
2407 | if (ctx == NULL) | |
2408 | goto netlbl_socket_setsid_return; | |
2409 | ||
7420ed23 VY |
2410 | secattr.domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], |
2411 | GFP_ATOMIC); | |
2412 | mls_export_lvl(ctx, &secattr.mls_lvl, NULL); | |
2413 | secattr.mls_lvl_vld = 1; | |
bf0edf39 PM |
2414 | rc = mls_export_cat(ctx, |
2415 | &secattr.mls_cat, | |
2416 | &secattr.mls_cat_len, | |
2417 | NULL, | |
2418 | NULL); | |
2419 | if (rc != 0) | |
2420 | goto netlbl_socket_setsid_return; | |
7420ed23 VY |
2421 | |
2422 | rc = netlbl_socket_setattr(sock, &secattr); | |
2423 | if (rc == 0) | |
2424 | sksec->nlbl_state = NLBL_LABELED; | |
2425 | ||
7420ed23 VY |
2426 | netlbl_socket_setsid_return: |
2427 | POLICY_RDUNLOCK; | |
bf0edf39 | 2428 | netlbl_secattr_destroy(&secattr); |
7420ed23 VY |
2429 | return rc; |
2430 | } | |
2431 | ||
99f59ed0 PM |
2432 | /** |
2433 | * selinux_netlbl_sk_security_init - Setup the NetLabel fields | |
2434 | * @ssec: the sk_security_struct | |
2435 | * @family: the socket family | |
2436 | * | |
2437 | * Description: | |
2438 | * Called when a new sk_security_struct is allocated to initialize the NetLabel | |
2439 | * fields. | |
2440 | * | |
2441 | */ | |
2442 | void selinux_netlbl_sk_security_init(struct sk_security_struct *ssec, | |
2443 | int family) | |
2444 | { | |
2445 | if (family == PF_INET) | |
2446 | ssec->nlbl_state = NLBL_REQUIRE; | |
2447 | else | |
2448 | ssec->nlbl_state = NLBL_UNSET; | |
2449 | } | |
2450 | ||
2451 | /** | |
2452 | * selinux_netlbl_sk_clone_security - Copy the NetLabel fields | |
2453 | * @ssec: the original sk_security_struct | |
2454 | * @newssec: the cloned sk_security_struct | |
2455 | * | |
2456 | * Description: | |
2457 | * Clone the NetLabel specific sk_security_struct fields from @ssec to | |
2458 | * @newssec. | |
2459 | * | |
2460 | */ | |
2461 | void selinux_netlbl_sk_clone_security(struct sk_security_struct *ssec, | |
2462 | struct sk_security_struct *newssec) | |
2463 | { | |
2464 | newssec->sclass = ssec->sclass; | |
2465 | if (ssec->nlbl_state != NLBL_UNSET) | |
2466 | newssec->nlbl_state = NLBL_REQUIRE; | |
2467 | else | |
2468 | newssec->nlbl_state = NLBL_UNSET; | |
2469 | } | |
2470 | ||
7420ed23 VY |
2471 | /** |
2472 | * selinux_netlbl_socket_post_create - Label a socket using NetLabel | |
2473 | * @sock: the socket to label | |
2474 | * @sock_family: the socket family | |
2475 | * @sid: the SID to use | |
2476 | * | |
2477 | * Description: | |
2478 | * Attempt to label a socket using the NetLabel mechanism using the given | |
2479 | * SID. Returns zero values on success, negative values on failure. | |
2480 | * | |
2481 | */ | |
2482 | int selinux_netlbl_socket_post_create(struct socket *sock, | |
2483 | int sock_family, | |
2484 | u32 sid) | |
2485 | { | |
2486 | struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; | |
2487 | struct sk_security_struct *sksec = sock->sk->sk_security; | |
2488 | ||
99f59ed0 PM |
2489 | sksec->sclass = isec->sclass; |
2490 | ||
7420ed23 VY |
2491 | if (sock_family != PF_INET) |
2492 | return 0; | |
2493 | ||
7420ed23 VY |
2494 | sksec->nlbl_state = NLBL_REQUIRE; |
2495 | return selinux_netlbl_socket_setsid(sock, sid); | |
2496 | } | |
2497 | ||
2498 | /** | |
2499 | * selinux_netlbl_sock_graft - Netlabel the new socket | |
2500 | * @sk: the new connection | |
2501 | * @sock: the new socket | |
2502 | * | |
2503 | * Description: | |
2504 | * The connection represented by @sk is being grafted onto @sock so set the | |
2505 | * socket's NetLabel to match the SID of @sk. | |
2506 | * | |
2507 | */ | |
2508 | void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock) | |
2509 | { | |
2510 | struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; | |
2511 | struct sk_security_struct *sksec = sk->sk_security; | |
14a72f53 PM |
2512 | struct netlbl_lsm_secattr secattr; |
2513 | u32 nlbl_peer_sid; | |
7420ed23 | 2514 | |
99f59ed0 PM |
2515 | sksec->sclass = isec->sclass; |
2516 | ||
7420ed23 VY |
2517 | if (sk->sk_family != PF_INET) |
2518 | return; | |
2519 | ||
14a72f53 PM |
2520 | netlbl_secattr_init(&secattr); |
2521 | if (netlbl_sock_getattr(sk, &secattr) == 0 && | |
2522 | selinux_netlbl_secattr_to_sid(NULL, | |
2523 | &secattr, | |
388b2405 | 2524 | SECINITSID_UNLABELED, |
14a72f53 PM |
2525 | &nlbl_peer_sid) == 0) |
2526 | sksec->peer_sid = nlbl_peer_sid; | |
ffb733c6 | 2527 | netlbl_secattr_destroy(&secattr); |
14a72f53 | 2528 | |
7420ed23 | 2529 | sksec->nlbl_state = NLBL_REQUIRE; |
7420ed23 VY |
2530 | |
2531 | /* Try to set the NetLabel on the socket to save time later, if we fail | |
2532 | * here we will pick up the pieces in later calls to | |
2533 | * selinux_netlbl_inode_permission(). */ | |
2534 | selinux_netlbl_socket_setsid(sock, sksec->sid); | |
2535 | } | |
2536 | ||
2537 | /** | |
2538 | * selinux_netlbl_inet_conn_request - Handle a new connection request | |
2539 | * @skb: the packet | |
2540 | * @sock_sid: the SID of the parent socket | |
2541 | * | |
2542 | * Description: | |
2543 | * If present, use the security attributes of the packet in @skb and the | |
2544 | * parent sock's SID to arrive at a SID for the new child sock. Returns the | |
2545 | * SID of the connection or SECSID_NULL on failure. | |
2546 | * | |
2547 | */ | |
2548 | u32 selinux_netlbl_inet_conn_request(struct sk_buff *skb, u32 sock_sid) | |
2549 | { | |
2550 | int rc; | |
2551 | u32 peer_sid; | |
2552 | ||
2553 | rc = selinux_netlbl_skbuff_getsid(skb, sock_sid, &peer_sid); | |
2554 | if (rc != 0) | |
2555 | return SECSID_NULL; | |
2556 | ||
7420ed23 VY |
2557 | return peer_sid; |
2558 | } | |
2559 | ||
2560 | /** | |
e448e931 | 2561 | * selinux_netlbl_inode_permission - Verify the socket is NetLabel labeled |
7420ed23 VY |
2562 | * @inode: the file descriptor's inode |
2563 | * @mask: the permission mask | |
2564 | * | |
2565 | * Description: | |
e448e931 PM |
2566 | * Looks at a file's inode and if it is marked as a socket protected by |
2567 | * NetLabel then verify that the socket has been labeled, if not try to label | |
2568 | * the socket now with the inode's SID. Returns zero on success, negative | |
2569 | * values on failure. | |
7420ed23 VY |
2570 | * |
2571 | */ | |
e448e931 | 2572 | int selinux_netlbl_inode_permission(struct inode *inode, int mask) |
7420ed23 VY |
2573 | { |
2574 | int rc; | |
e448e931 PM |
2575 | struct inode_security_struct *isec; |
2576 | struct sk_security_struct *sksec; | |
2577 | struct socket *sock; | |
7420ed23 | 2578 | |
e448e931 PM |
2579 | if (!S_ISSOCK(inode->i_mode)) |
2580 | return 0; | |
2581 | ||
2582 | sock = SOCKET_I(inode); | |
2583 | isec = inode->i_security; | |
2584 | sksec = sock->sk->sk_security; | |
23970741 | 2585 | mutex_lock(&isec->lock); |
e448e931 PM |
2586 | if (unlikely(sksec->nlbl_state == NLBL_REQUIRE && |
2587 | (mask & (MAY_WRITE | MAY_APPEND)))) { | |
2588 | lock_sock(sock->sk); | |
2589 | rc = selinux_netlbl_socket_setsid(sock, sksec->sid); | |
2590 | release_sock(sock->sk); | |
2591 | } else | |
2592 | rc = 0; | |
23970741 | 2593 | mutex_unlock(&isec->lock); |
7420ed23 VY |
2594 | |
2595 | return rc; | |
2596 | } | |
2597 | ||
2598 | /** | |
2599 | * selinux_netlbl_sock_rcv_skb - Do an inbound access check using NetLabel | |
2600 | * @sksec: the sock's sk_security_struct | |
2601 | * @skb: the packet | |
2602 | * @ad: the audit data | |
2603 | * | |
2604 | * Description: | |
2605 | * Fetch the NetLabel security attributes from @skb and perform an access check | |
2606 | * against the receiving socket. Returns zero on success, negative values on | |
2607 | * error. | |
2608 | * | |
2609 | */ | |
2610 | int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec, | |
2611 | struct sk_buff *skb, | |
2612 | struct avc_audit_data *ad) | |
2613 | { | |
2614 | int rc; | |
2615 | u32 netlbl_sid; | |
2616 | u32 recv_perm; | |
2617 | ||
388b2405 | 2618 | rc = selinux_netlbl_skbuff_getsid(skb, |
2619 | SECINITSID_UNLABELED, | |
2620 | &netlbl_sid); | |
7420ed23 VY |
2621 | if (rc != 0) |
2622 | return rc; | |
2623 | ||
388b2405 | 2624 | if (netlbl_sid == SECSID_NULL) |
7420ed23 VY |
2625 | return 0; |
2626 | ||
2627 | switch (sksec->sclass) { | |
2628 | case SECCLASS_UDP_SOCKET: | |
df2115c3 | 2629 | recv_perm = UDP_SOCKET__RECVFROM; |
7420ed23 VY |
2630 | break; |
2631 | case SECCLASS_TCP_SOCKET: | |
df2115c3 | 2632 | recv_perm = TCP_SOCKET__RECVFROM; |
7420ed23 VY |
2633 | break; |
2634 | default: | |
df2115c3 | 2635 | recv_perm = RAWIP_SOCKET__RECVFROM; |
7420ed23 VY |
2636 | } |
2637 | ||
2638 | rc = avc_has_perm(sksec->sid, | |
2639 | netlbl_sid, | |
2640 | sksec->sclass, | |
2641 | recv_perm, | |
2642 | ad); | |
2643 | if (rc == 0) | |
2644 | return 0; | |
2645 | ||
2646 | netlbl_skbuff_err(skb, rc); | |
2647 | return rc; | |
2648 | } | |
2649 | ||
2650 | /** | |
c1b14c0a | 2651 | * selinux_netlbl_socket_getpeersec_stream - Return the connected peer's SID |
7420ed23 VY |
2652 | * @sock: the socket |
2653 | * | |
2654 | * Description: | |
2655 | * Examine @sock to find the connected peer's SID. Returns the SID on success | |
2656 | * or SECSID_NULL on error. | |
2657 | * | |
2658 | */ | |
2659 | u32 selinux_netlbl_socket_getpeersec_stream(struct socket *sock) | |
2660 | { | |
2661 | struct sk_security_struct *sksec = sock->sk->sk_security; | |
7420ed23 VY |
2662 | return sksec->peer_sid; |
2663 | } | |
2664 | ||
2665 | /** | |
2666 | * selinux_netlbl_socket_getpeersec_dgram - Return the SID of a NetLabel packet | |
2667 | * @skb: the packet | |
2668 | * | |
2669 | * Description: | |
2670 | * Examine @skb to find the SID assigned to it by NetLabel. Returns the SID on | |
2671 | * success, SECSID_NULL on error. | |
2672 | * | |
2673 | */ | |
2674 | u32 selinux_netlbl_socket_getpeersec_dgram(struct sk_buff *skb) | |
2675 | { | |
2676 | int peer_sid; | |
7420ed23 | 2677 | |
388b2405 | 2678 | if (selinux_netlbl_skbuff_getsid(skb, |
2679 | SECINITSID_UNLABELED, | |
2680 | &peer_sid) != 0) | |
7420ed23 VY |
2681 | return SECSID_NULL; |
2682 | ||
2683 | return peer_sid; | |
2684 | } | |
2685 | #endif /* CONFIG_NETLABEL */ |