blob: 0158cde957eec2cd0e6ca0c81848f1a9566feccf [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Implementation of the security services.
3 *
Stephen Smalley7efbb602017-08-17 13:32:36 -04004 * Authors : Stephen Smalley, <sds@tycho.nsa.gov>
Eric Paris5d55a342008-04-18 17:38:33 -04005 * James Morris <jmorris@redhat.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
7 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
8 *
9 * Support for enhanced MLS infrastructure.
Darrel Goeddel376bd9c2006-02-24 15:44:05 -060010 * Support for context based audit filters.
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 *
12 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
13 *
Eric Paris5d55a342008-04-18 17:38:33 -040014 * Added conditional policy language extensions
Linus Torvalds1da177e2005-04-16 15:20:36 -070015 *
Paul Moore82c21bf2011-08-01 11:10:33 +000016 * Updated: Hewlett-Packard <paul@paul-moore.com>
Venkat Yekkirala7420ed22006-08-04 23:17:57 -070017 *
18 * Added support for NetLabel
Paul Moore3bb56b22008-01-29 08:38:19 -050019 * Added support for the policy capability bitmap
Venkat Yekkirala7420ed22006-08-04 23:17:57 -070020 *
Chad Sellersb94c7e62006-11-06 12:38:18 -050021 * Updated: Chad Sellers <csellers@tresys.com>
22 *
23 * Added validation of kernel classes and permissions
24 *
KaiGai Kohei44c2d9b2009-06-18 17:26:13 +090025 * Updated: KaiGai Kohei <kaigai@ak.jp.nec.com>
26 *
27 * Added support for bounds domain and audit messaged on masked permissions
28 *
Guido Trentalancia0719aaf2010-02-03 16:40:20 +010029 * Updated: Guido Trentalancia <guido@trentalancia.com>
30 *
31 * Added support for runtime switching of the policy type
32 *
KaiGai Kohei44c2d9b2009-06-18 17:26:13 +090033 * Copyright (C) 2008, 2009 NEC Corporation
Paul Moore3bb56b22008-01-29 08:38:19 -050034 * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P.
Darrel Goeddel376bd9c2006-02-24 15:44:05 -060035 * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
Chad Sellersb94c7e62006-11-06 12:38:18 -050036 * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
38 * This program is free software; you can redistribute it and/or modify
Eric Paris5d55a342008-04-18 17:38:33 -040039 * it under the terms of the GNU General Public License as published by
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 * the Free Software Foundation, version 2.
41 */
42#include <linux/kernel.h>
43#include <linux/slab.h>
44#include <linux/string.h>
45#include <linux/spinlock.h>
Paul Moore9f2ad662006-11-17 17:38:53 -050046#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <linux/errno.h>
48#include <linux/in.h>
49#include <linux/sched.h>
50#include <linux/audit.h>
Ingo Molnarbb003072006-03-22 00:09:14 -080051#include <linux/mutex.h>
Adrian Bunk0e55a002008-03-31 01:54:02 +030052#include <linux/selinux.h>
Eric Paris6371dcd2010-07-29 23:02:34 -040053#include <linux/flex_array.h>
Stephen Rothwellf0d3d982010-10-20 16:08:00 +110054#include <linux/vmalloc.h>
Venkat Yekkirala7420ed22006-08-04 23:17:57 -070055#include <net/netlabel.h>
Ingo Molnarbb003072006-03-22 00:09:14 -080056
Linus Torvalds1da177e2005-04-16 15:20:36 -070057#include "flask.h"
58#include "avc.h"
59#include "avc_ss.h"
60#include "security.h"
61#include "context.h"
62#include "policydb.h"
63#include "sidtab.h"
64#include "services.h"
65#include "conditional.h"
66#include "mls.h"
Venkat Yekkirala7420ed22006-08-04 23:17:57 -070067#include "objsec.h"
Paul Moorec60475b2007-02-28 15:14:23 -050068#include "netlabel.h"
Paul Moore3de4bab2006-11-17 17:38:54 -050069#include "xfrm.h"
Paul Moore02752762006-11-29 13:18:18 -050070#include "ebitmap.h"
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +020071#include "audit.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Stephen Smalley4dc2fce2017-05-18 16:58:31 -040073/* Policy capability names */
74char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX] = {
75 "network_peer_controls",
76 "open_perms",
77 "extended_socket_class",
78 "always_check_network",
Stephen Smalleyaf63f412017-07-31 10:12:46 -040079 "cgroup_seclabel",
80 "nnp_nosuid_transition"
Stephen Smalley4dc2fce2017-05-18 16:58:31 -040081};
82
Paul Moore3bb56b22008-01-29 08:38:19 -050083int selinux_policycap_netpeer;
Eric Parisb0c636b2008-02-28 12:58:40 -050084int selinux_policycap_openperm;
Stephen Smalleyda69a532017-01-09 10:07:30 -050085int selinux_policycap_extsockclass;
Chris PeBenito2be4d742013-05-03 09:05:39 -040086int selinux_policycap_alwaysnetwork;
Stephen Smalley2651225b2017-02-28 10:35:56 -050087int selinux_policycap_cgroupseclabel;
Stephen Smalleyaf63f412017-07-31 10:12:46 -040088int selinux_policycap_nnp_nosuid_transition;
Paul Moore3bb56b22008-01-29 08:38:19 -050089
Linus Torvalds1da177e2005-04-16 15:20:36 -070090static DEFINE_RWLOCK(policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92static struct sidtab sidtab;
93struct policydb policydb;
Eric Paris5d55a342008-04-18 17:38:33 -040094int ss_initialized;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96/*
97 * The largest sequence number that has been used when
98 * providing an access decision to the access vector cache.
99 * The sequence number only changes when a policy change
100 * occurs.
101 */
Eric Paris5d55a342008-04-18 17:38:33 -0400102static u32 latest_granting;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104/* Forward declaration. */
105static int context_struct_to_string(struct context *context, char **scontext,
106 u32 *scontext_len);
107
Stephen Smalley19439d02010-01-14 17:28:10 -0500108static void context_struct_compute_av(struct context *scontext,
Jeff Vander Stoepfa1aa142015-07-10 17:19:56 -0400109 struct context *tcontext,
110 u16 tclass,
111 struct av_decision *avd,
112 struct extended_perms *xperms);
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400113
114struct selinux_mapping {
115 u16 value; /* policy value */
116 unsigned num_perms;
117 u32 perms[sizeof(u32) * 8];
118};
119
120static struct selinux_mapping *current_mapping;
121static u16 current_mapping_size;
122
123static int selinux_set_mapping(struct policydb *pol,
124 struct security_class_mapping *map,
125 struct selinux_mapping **out_map_p,
126 u16 *out_map_size)
127{
128 struct selinux_mapping *out_map = NULL;
129 size_t size = sizeof(struct selinux_mapping);
130 u16 i, j;
131 unsigned k;
132 bool print_unknown_handle = false;
133
134 /* Find number of classes in the input mapping */
135 if (!map)
136 return -EINVAL;
137 i = 0;
138 while (map[i].name)
139 i++;
140
141 /* Allocate space for the class records, plus one for class zero */
142 out_map = kcalloc(++i, size, GFP_ATOMIC);
143 if (!out_map)
144 return -ENOMEM;
145
146 /* Store the raw class and permission values */
147 j = 0;
148 while (map[j].name) {
149 struct security_class_mapping *p_in = map + (j++);
150 struct selinux_mapping *p_out = out_map + j;
151
152 /* An empty class string skips ahead */
153 if (!strcmp(p_in->name, "")) {
154 p_out->num_perms = 0;
155 continue;
156 }
157
158 p_out->value = string_to_security_class(pol, p_in->name);
159 if (!p_out->value) {
160 printk(KERN_INFO
161 "SELinux: Class %s not defined in policy.\n",
162 p_in->name);
163 if (pol->reject_unknown)
164 goto err;
165 p_out->num_perms = 0;
166 print_unknown_handle = true;
167 continue;
168 }
169
170 k = 0;
Matthias Kaehlcke342e9152017-03-16 15:26:52 -0700171 while (p_in->perms[k]) {
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400172 /* An empty permission string skips ahead */
173 if (!*p_in->perms[k]) {
174 k++;
175 continue;
176 }
177 p_out->perms[k] = string_to_av_perm(pol, p_out->value,
178 p_in->perms[k]);
179 if (!p_out->perms[k]) {
180 printk(KERN_INFO
181 "SELinux: Permission %s in class %s not defined in policy.\n",
182 p_in->perms[k], p_in->name);
183 if (pol->reject_unknown)
184 goto err;
185 print_unknown_handle = true;
186 }
187
188 k++;
189 }
190 p_out->num_perms = k;
191 }
192
193 if (print_unknown_handle)
194 printk(KERN_INFO "SELinux: the above unknown classes and permissions will be %s\n",
195 pol->allow_unknown ? "allowed" : "denied");
196
197 *out_map_p = out_map;
198 *out_map_size = i;
199 return 0;
200err:
201 kfree(out_map);
202 return -EINVAL;
203}
204
205/*
206 * Get real, policy values from mapped values
207 */
208
209static u16 unmap_class(u16 tclass)
210{
211 if (tclass < current_mapping_size)
212 return current_mapping[tclass].value;
213
214 return tclass;
215}
216
Harry Ciao6f5317e2011-03-02 13:32:33 +0800217/*
218 * Get kernel value for class from its policy value
219 */
220static u16 map_class(u16 pol_value)
221{
222 u16 i;
223
224 for (i = 1; i < current_mapping_size; i++) {
225 if (current_mapping[i].value == pol_value)
226 return i;
227 }
228
Stephen Smalley85cd6da2011-03-25 10:13:43 -0400229 return SECCLASS_NULL;
Harry Ciao6f5317e2011-03-02 13:32:33 +0800230}
231
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400232static void map_decision(u16 tclass, struct av_decision *avd,
233 int allow_unknown)
234{
235 if (tclass < current_mapping_size) {
236 unsigned i, n = current_mapping[tclass].num_perms;
237 u32 result;
238
239 for (i = 0, result = 0; i < n; i++) {
240 if (avd->allowed & current_mapping[tclass].perms[i])
241 result |= 1<<i;
242 if (allow_unknown && !current_mapping[tclass].perms[i])
243 result |= 1<<i;
244 }
245 avd->allowed = result;
246
247 for (i = 0, result = 0; i < n; i++)
248 if (avd->auditallow & current_mapping[tclass].perms[i])
249 result |= 1<<i;
250 avd->auditallow = result;
251
252 for (i = 0, result = 0; i < n; i++) {
253 if (avd->auditdeny & current_mapping[tclass].perms[i])
254 result |= 1<<i;
255 if (!allow_unknown && !current_mapping[tclass].perms[i])
256 result |= 1<<i;
257 }
Eric Paris0bce9522009-11-23 16:47:23 -0500258 /*
259 * In case the kernel has a bug and requests a permission
260 * between num_perms and the maximum permission number, we
261 * should audit that denial
262 */
263 for (; i < (sizeof(u32)*8); i++)
264 result |= 1<<i;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400265 avd->auditdeny = result;
266 }
267}
268
Guido Trentalancia0719aaf2010-02-03 16:40:20 +0100269int security_mls_enabled(void)
270{
271 return policydb.mls_enabled;
272}
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274/*
275 * Return the boolean value of a constraint expression
276 * when it is applied to the specified source and target
277 * security contexts.
278 *
279 * xcontext is a special beast... It is used by the validatetrans rules
280 * only. For these rules, scontext is the context before the transition,
281 * tcontext is the context after the transition, and xcontext is the context
282 * of the process performing the transition. All other callers of
283 * constraint_expr_eval should pass in NULL for xcontext.
284 */
285static int constraint_expr_eval(struct context *scontext,
286 struct context *tcontext,
287 struct context *xcontext,
288 struct constraint_expr *cexpr)
289{
290 u32 val1, val2;
291 struct context *c;
292 struct role_datum *r1, *r2;
293 struct mls_level *l1, *l2;
294 struct constraint_expr *e;
295 int s[CEXPR_MAXDEPTH];
296 int sp = -1;
297
298 for (e = cexpr; e; e = e->next) {
299 switch (e->expr_type) {
300 case CEXPR_NOT:
301 BUG_ON(sp < 0);
302 s[sp] = !s[sp];
303 break;
304 case CEXPR_AND:
305 BUG_ON(sp < 1);
306 sp--;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800307 s[sp] &= s[sp + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 break;
309 case CEXPR_OR:
310 BUG_ON(sp < 1);
311 sp--;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800312 s[sp] |= s[sp + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 break;
314 case CEXPR_ATTR:
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800315 if (sp == (CEXPR_MAXDEPTH - 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 return 0;
317 switch (e->attr) {
318 case CEXPR_USER:
319 val1 = scontext->user;
320 val2 = tcontext->user;
321 break;
322 case CEXPR_TYPE:
323 val1 = scontext->type;
324 val2 = tcontext->type;
325 break;
326 case CEXPR_ROLE:
327 val1 = scontext->role;
328 val2 = tcontext->role;
329 r1 = policydb.role_val_to_struct[val1 - 1];
330 r2 = policydb.role_val_to_struct[val2 - 1];
331 switch (e->op) {
332 case CEXPR_DOM:
333 s[++sp] = ebitmap_get_bit(&r1->dominates,
334 val2 - 1);
335 continue;
336 case CEXPR_DOMBY:
337 s[++sp] = ebitmap_get_bit(&r2->dominates,
338 val1 - 1);
339 continue;
340 case CEXPR_INCOMP:
Eric Paris5d55a342008-04-18 17:38:33 -0400341 s[++sp] = (!ebitmap_get_bit(&r1->dominates,
342 val2 - 1) &&
343 !ebitmap_get_bit(&r2->dominates,
344 val1 - 1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 continue;
346 default:
347 break;
348 }
349 break;
350 case CEXPR_L1L2:
351 l1 = &(scontext->range.level[0]);
352 l2 = &(tcontext->range.level[0]);
353 goto mls_ops;
354 case CEXPR_L1H2:
355 l1 = &(scontext->range.level[0]);
356 l2 = &(tcontext->range.level[1]);
357 goto mls_ops;
358 case CEXPR_H1L2:
359 l1 = &(scontext->range.level[1]);
360 l2 = &(tcontext->range.level[0]);
361 goto mls_ops;
362 case CEXPR_H1H2:
363 l1 = &(scontext->range.level[1]);
364 l2 = &(tcontext->range.level[1]);
365 goto mls_ops;
366 case CEXPR_L1H1:
367 l1 = &(scontext->range.level[0]);
368 l2 = &(scontext->range.level[1]);
369 goto mls_ops;
370 case CEXPR_L2H2:
371 l1 = &(tcontext->range.level[0]);
372 l2 = &(tcontext->range.level[1]);
373 goto mls_ops;
374mls_ops:
375 switch (e->op) {
376 case CEXPR_EQ:
377 s[++sp] = mls_level_eq(l1, l2);
378 continue;
379 case CEXPR_NEQ:
380 s[++sp] = !mls_level_eq(l1, l2);
381 continue;
382 case CEXPR_DOM:
383 s[++sp] = mls_level_dom(l1, l2);
384 continue;
385 case CEXPR_DOMBY:
386 s[++sp] = mls_level_dom(l2, l1);
387 continue;
388 case CEXPR_INCOMP:
389 s[++sp] = mls_level_incomp(l2, l1);
390 continue;
391 default:
392 BUG();
393 return 0;
394 }
395 break;
396 default:
397 BUG();
398 return 0;
399 }
400
401 switch (e->op) {
402 case CEXPR_EQ:
403 s[++sp] = (val1 == val2);
404 break;
405 case CEXPR_NEQ:
406 s[++sp] = (val1 != val2);
407 break;
408 default:
409 BUG();
410 return 0;
411 }
412 break;
413 case CEXPR_NAMES:
414 if (sp == (CEXPR_MAXDEPTH-1))
415 return 0;
416 c = scontext;
417 if (e->attr & CEXPR_TARGET)
418 c = tcontext;
419 else if (e->attr & CEXPR_XTARGET) {
420 c = xcontext;
421 if (!c) {
422 BUG();
423 return 0;
424 }
425 }
426 if (e->attr & CEXPR_USER)
427 val1 = c->user;
428 else if (e->attr & CEXPR_ROLE)
429 val1 = c->role;
430 else if (e->attr & CEXPR_TYPE)
431 val1 = c->type;
432 else {
433 BUG();
434 return 0;
435 }
436
437 switch (e->op) {
438 case CEXPR_EQ:
439 s[++sp] = ebitmap_get_bit(&e->names, val1 - 1);
440 break;
441 case CEXPR_NEQ:
442 s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1);
443 break;
444 default:
445 BUG();
446 return 0;
447 }
448 break;
449 default:
450 BUG();
451 return 0;
452 }
453 }
454
455 BUG_ON(sp != 0);
456 return s[0];
457}
458
459/*
KaiGai Kohei44c2d9b2009-06-18 17:26:13 +0900460 * security_dump_masked_av - dumps masked permissions during
461 * security_compute_av due to RBAC, MLS/Constraint and Type bounds.
462 */
463static int dump_masked_av_helper(void *k, void *d, void *args)
464{
465 struct perm_datum *pdatum = d;
466 char **permission_names = args;
467
468 BUG_ON(pdatum->value < 1 || pdatum->value > 32);
469
470 permission_names[pdatum->value - 1] = (char *)k;
471
472 return 0;
473}
474
475static void security_dump_masked_av(struct context *scontext,
476 struct context *tcontext,
477 u16 tclass,
478 u32 permissions,
479 const char *reason)
480{
481 struct common_datum *common_dat;
482 struct class_datum *tclass_dat;
483 struct audit_buffer *ab;
484 char *tclass_name;
485 char *scontext_name = NULL;
486 char *tcontext_name = NULL;
487 char *permission_names[32];
James Morris2da5d312010-02-16 17:29:06 +1100488 int index;
489 u32 length;
KaiGai Kohei44c2d9b2009-06-18 17:26:13 +0900490 bool need_comma = false;
491
492 if (!permissions)
493 return;
494
Eric Parisac76c052010-11-29 15:47:09 -0500495 tclass_name = sym_name(&policydb, SYM_CLASSES, tclass - 1);
KaiGai Kohei44c2d9b2009-06-18 17:26:13 +0900496 tclass_dat = policydb.class_val_to_struct[tclass - 1];
497 common_dat = tclass_dat->comdatum;
498
499 /* init permission_names */
500 if (common_dat &&
501 hashtab_map(common_dat->permissions.table,
502 dump_masked_av_helper, permission_names) < 0)
503 goto out;
504
505 if (hashtab_map(tclass_dat->permissions.table,
506 dump_masked_av_helper, permission_names) < 0)
507 goto out;
508
509 /* get scontext/tcontext in text form */
510 if (context_struct_to_string(scontext,
511 &scontext_name, &length) < 0)
512 goto out;
513
514 if (context_struct_to_string(tcontext,
515 &tcontext_name, &length) < 0)
516 goto out;
517
518 /* audit a message */
519 ab = audit_log_start(current->audit_context,
520 GFP_ATOMIC, AUDIT_SELINUX_ERR);
521 if (!ab)
522 goto out;
523
524 audit_log_format(ab, "op=security_compute_av reason=%s "
525 "scontext=%s tcontext=%s tclass=%s perms=",
526 reason, scontext_name, tcontext_name, tclass_name);
527
528 for (index = 0; index < 32; index++) {
529 u32 mask = (1 << index);
530
531 if ((mask & permissions) == 0)
532 continue;
533
534 audit_log_format(ab, "%s%s",
535 need_comma ? "," : "",
536 permission_names[index]
537 ? permission_names[index] : "????");
538 need_comma = true;
539 }
540 audit_log_end(ab);
541out:
542 /* release scontext/tcontext */
543 kfree(tcontext_name);
544 kfree(scontext_name);
545
546 return;
547}
548
549/*
KaiGai Koheid9250de2008-08-28 16:35:57 +0900550 * security_boundary_permission - drops violated permissions
551 * on boundary constraint.
552 */
553static void type_attribute_bounds_av(struct context *scontext,
554 struct context *tcontext,
555 u16 tclass,
KaiGai Koheid9250de2008-08-28 16:35:57 +0900556 struct av_decision *avd)
557{
KaiGai Kohei2ae3ba32010-02-17 08:49:41 +0900558 struct context lo_scontext;
Stephen Smalley7ea59202016-05-23 10:54:11 -0400559 struct context lo_tcontext, *tcontextp = tcontext;
KaiGai Kohei2ae3ba32010-02-17 08:49:41 +0900560 struct av_decision lo_avd;
Eric Paris23bdecb2010-11-29 15:47:09 -0500561 struct type_datum *source;
562 struct type_datum *target;
KaiGai Kohei2ae3ba32010-02-17 08:49:41 +0900563 u32 masked = 0;
KaiGai Koheid9250de2008-08-28 16:35:57 +0900564
Eric Paris23bdecb2010-11-29 15:47:09 -0500565 source = flex_array_get_ptr(policydb.type_val_to_struct_array,
566 scontext->type - 1);
567 BUG_ON(!source);
568
Stephen Smalley7ea59202016-05-23 10:54:11 -0400569 if (!source->bounds)
570 return;
571
Eric Paris23bdecb2010-11-29 15:47:09 -0500572 target = flex_array_get_ptr(policydb.type_val_to_struct_array,
573 tcontext->type - 1);
574 BUG_ON(!target);
575
Stephen Smalley7ea59202016-05-23 10:54:11 -0400576 memset(&lo_avd, 0, sizeof(lo_avd));
KaiGai Koheid9250de2008-08-28 16:35:57 +0900577
Stephen Smalley7ea59202016-05-23 10:54:11 -0400578 memcpy(&lo_scontext, scontext, sizeof(lo_scontext));
579 lo_scontext.type = source->bounds;
KaiGai Koheid9250de2008-08-28 16:35:57 +0900580
KaiGai Kohei2ae3ba32010-02-17 08:49:41 +0900581 if (target->bounds) {
KaiGai Kohei2ae3ba32010-02-17 08:49:41 +0900582 memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext));
583 lo_tcontext.type = target->bounds;
Stephen Smalley7ea59202016-05-23 10:54:11 -0400584 tcontextp = &lo_tcontext;
KaiGai Kohei2ae3ba32010-02-17 08:49:41 +0900585 }
586
Stephen Smalley7ea59202016-05-23 10:54:11 -0400587 context_struct_compute_av(&lo_scontext,
588 tcontextp,
589 tclass,
590 &lo_avd,
591 NULL);
KaiGai Kohei2ae3ba32010-02-17 08:49:41 +0900592
Stephen Smalley7ea59202016-05-23 10:54:11 -0400593 masked = ~lo_avd.allowed & avd->allowed;
KaiGai Kohei2ae3ba32010-02-17 08:49:41 +0900594
Stephen Smalley7ea59202016-05-23 10:54:11 -0400595 if (likely(!masked))
596 return; /* no masked permission */
KaiGai Koheid9250de2008-08-28 16:35:57 +0900597
Stephen Smalley7ea59202016-05-23 10:54:11 -0400598 /* mask violated permissions */
599 avd->allowed &= ~masked;
600
601 /* audit masked permissions */
602 security_dump_masked_av(scontext, tcontext,
603 tclass, masked, "bounds");
KaiGai Koheid9250de2008-08-28 16:35:57 +0900604}
605
606/*
Jeff Vander Stoepfa1aa142015-07-10 17:19:56 -0400607 * flag which drivers have permissions
608 * only looking for ioctl based extended permssions
609 */
610void services_compute_xperms_drivers(
611 struct extended_perms *xperms,
612 struct avtab_node *node)
613{
614 unsigned int i;
615
616 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) {
617 /* if one or more driver has all permissions allowed */
618 for (i = 0; i < ARRAY_SIZE(xperms->drivers.p); i++)
619 xperms->drivers.p[i] |= node->datum.u.xperms->perms.p[i];
620 } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) {
621 /* if allowing permissions within a driver */
622 security_xperm_set(xperms->drivers.p,
623 node->datum.u.xperms->driver);
624 }
625
626 /* If no ioctl commands are allowed, ignore auditallow and auditdeny */
627 if (node->key.specified & AVTAB_XPERMS_ALLOWED)
628 xperms->len = 1;
629}
630
631/*
632 * Compute access vectors and extended permissions based on a context
633 * structure pair for the permissions in a particular class.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 */
Stephen Smalley19439d02010-01-14 17:28:10 -0500635static void context_struct_compute_av(struct context *scontext,
Jeff Vander Stoepfa1aa142015-07-10 17:19:56 -0400636 struct context *tcontext,
637 u16 tclass,
638 struct av_decision *avd,
639 struct extended_perms *xperms)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640{
641 struct constraint_node *constraint;
642 struct role_allow *ra;
643 struct avtab_key avkey;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700644 struct avtab_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 struct class_datum *tclass_datum;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700646 struct ebitmap *sattr, *tattr;
647 struct ebitmap_node *snode, *tnode;
648 unsigned int i, j;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 avd->allowed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 avd->auditallow = 0;
652 avd->auditdeny = 0xffffffff;
Jeff Vander Stoepfa1aa142015-07-10 17:19:56 -0400653 if (xperms) {
654 memset(&xperms->drivers, 0, sizeof(xperms->drivers));
655 xperms->len = 0;
656 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400658 if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) {
659 if (printk_ratelimit())
660 printk(KERN_WARNING "SELinux: Invalid class %hu\n", tclass);
Stephen Smalley19439d02010-01-14 17:28:10 -0500661 return;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400662 }
Eric Paris3f120702007-09-21 14:37:10 -0400663
664 tclass_datum = policydb.class_val_to_struct[tclass - 1];
665
666 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 * If a specific type enforcement rule was defined for
668 * this permission check, then use it.
669 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 avkey.target_class = tclass;
Jeff Vander Stoepfa1aa142015-07-10 17:19:56 -0400671 avkey.specified = AVTAB_AV | AVTAB_XPERMS;
Eric Paris6371dcd2010-07-29 23:02:34 -0400672 sattr = flex_array_get(policydb.type_attr_map_array, scontext->type - 1);
673 BUG_ON(!sattr);
674 tattr = flex_array_get(policydb.type_attr_map_array, tcontext->type - 1);
675 BUG_ON(!tattr);
KaiGai Kohei9fe79ad2007-09-29 02:20:55 +0900676 ebitmap_for_each_positive_bit(sattr, snode, i) {
677 ebitmap_for_each_positive_bit(tattr, tnode, j) {
Stephen Smalley782ebb92005-09-03 15:55:16 -0700678 avkey.source_type = i + 1;
679 avkey.target_type = j + 1;
680 for (node = avtab_search_node(&policydb.te_avtab, &avkey);
Vesa-Matti Karidbc74c62008-08-07 03:18:20 +0300681 node;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700682 node = avtab_search_node_next(node, avkey.specified)) {
683 if (node->key.specified == AVTAB_ALLOWED)
Jeff Vander Stoepfa1aa142015-07-10 17:19:56 -0400684 avd->allowed |= node->datum.u.data;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700685 else if (node->key.specified == AVTAB_AUDITALLOW)
Jeff Vander Stoepfa1aa142015-07-10 17:19:56 -0400686 avd->auditallow |= node->datum.u.data;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700687 else if (node->key.specified == AVTAB_AUDITDENY)
Jeff Vander Stoepfa1aa142015-07-10 17:19:56 -0400688 avd->auditdeny &= node->datum.u.data;
689 else if (xperms && (node->key.specified & AVTAB_XPERMS))
690 services_compute_xperms_drivers(xperms, node);
Stephen Smalley782ebb92005-09-03 15:55:16 -0700691 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
Stephen Smalley782ebb92005-09-03 15:55:16 -0700693 /* Check conditional av table for additional permissions */
Jeff Vander Stoepfa1aa142015-07-10 17:19:56 -0400694 cond_compute_av(&policydb.te_cond_avtab, &avkey,
695 avd, xperms);
Stephen Smalley782ebb92005-09-03 15:55:16 -0700696
697 }
698 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
700 /*
701 * Remove any permissions prohibited by a constraint (this includes
702 * the MLS policy).
703 */
704 constraint = tclass_datum->constraints;
705 while (constraint) {
706 if ((constraint->permissions & (avd->allowed)) &&
707 !constraint_expr_eval(scontext, tcontext, NULL,
708 constraint->expr)) {
KaiGai Koheicaabbdc2009-06-18 17:30:07 +0900709 avd->allowed &= ~(constraint->permissions);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 }
711 constraint = constraint->next;
712 }
713
714 /*
715 * If checking process transition permission and the
716 * role is changing, then check the (current_role, new_role)
717 * pair.
718 */
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400719 if (tclass == policydb.process_class &&
720 (avd->allowed & policydb.process_trans_perms) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 scontext->role != tcontext->role) {
722 for (ra = policydb.role_allow; ra; ra = ra->next) {
723 if (scontext->role == ra->role &&
724 tcontext->role == ra->new_role)
725 break;
726 }
727 if (!ra)
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400728 avd->allowed &= ~policydb.process_trans_perms;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 }
730
KaiGai Koheid9250de2008-08-28 16:35:57 +0900731 /*
732 * If the given source and target types have boundary
733 * constraint, lazy checks have to mask any violated
734 * permission and notice it to userspace via audit.
735 */
736 type_attribute_bounds_av(scontext, tcontext,
Stephen Smalley19439d02010-01-14 17:28:10 -0500737 tclass, avd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738}
739
740static int security_validtrans_handle_fail(struct context *ocontext,
Eric Paris5d55a342008-04-18 17:38:33 -0400741 struct context *ncontext,
742 struct context *tcontext,
743 u16 tclass)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744{
745 char *o = NULL, *n = NULL, *t = NULL;
746 u32 olen, nlen, tlen;
747
Eric Paris4b02b522010-11-23 11:40:08 -0500748 if (context_struct_to_string(ocontext, &o, &olen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 goto out;
Eric Paris4b02b522010-11-23 11:40:08 -0500750 if (context_struct_to_string(ncontext, &n, &nlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 goto out;
Eric Paris4b02b522010-11-23 11:40:08 -0500752 if (context_struct_to_string(tcontext, &t, &tlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 goto out;
David Woodhouse9ad9ad32005-06-22 15:04:33 +0100754 audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
Richard Guy Briggs4093a842014-09-18 20:47:48 -0400755 "op=security_validate_transition seresult=denied"
Eric Paris5d55a342008-04-18 17:38:33 -0400756 " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s",
Eric Parisac76c052010-11-29 15:47:09 -0500757 o, n, t, sym_name(&policydb, SYM_CLASSES, tclass-1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758out:
759 kfree(o);
760 kfree(n);
761 kfree(t);
762
763 if (!selinux_enforcing)
764 return 0;
765 return -EPERM;
766}
767
Andrew Perepechkof9df6452015-12-24 11:09:41 -0500768static int security_compute_validatetrans(u32 oldsid, u32 newsid, u32 tasksid,
769 u16 orig_tclass, bool user)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770{
771 struct context *ocontext;
772 struct context *ncontext;
773 struct context *tcontext;
774 struct class_datum *tclass_datum;
775 struct constraint_node *constraint;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400776 u16 tclass;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 int rc = 0;
778
779 if (!ss_initialized)
780 return 0;
781
James Morris0804d112008-06-06 18:40:29 +1000782 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
Andrew Perepechkof9df6452015-12-24 11:09:41 -0500784 if (!user)
785 tclass = unmap_class(orig_tclass);
786 else
787 tclass = orig_tclass;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400788
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 if (!tclass || tclass > policydb.p_classes.nprim) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 rc = -EINVAL;
791 goto out;
792 }
793 tclass_datum = policydb.class_val_to_struct[tclass - 1];
794
795 ocontext = sidtab_search(&sidtab, oldsid);
796 if (!ocontext) {
Eric Paris744ba352008-04-17 11:52:44 -0400797 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
798 __func__, oldsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 rc = -EINVAL;
800 goto out;
801 }
802
803 ncontext = sidtab_search(&sidtab, newsid);
804 if (!ncontext) {
Eric Paris744ba352008-04-17 11:52:44 -0400805 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
806 __func__, newsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 rc = -EINVAL;
808 goto out;
809 }
810
811 tcontext = sidtab_search(&sidtab, tasksid);
812 if (!tcontext) {
Eric Paris744ba352008-04-17 11:52:44 -0400813 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
814 __func__, tasksid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 rc = -EINVAL;
816 goto out;
817 }
818
819 constraint = tclass_datum->validatetrans;
820 while (constraint) {
821 if (!constraint_expr_eval(ocontext, ncontext, tcontext,
Eric Paris5d55a342008-04-18 17:38:33 -0400822 constraint->expr)) {
Andrew Perepechkof9df6452015-12-24 11:09:41 -0500823 if (user)
824 rc = -EPERM;
825 else
826 rc = security_validtrans_handle_fail(ocontext,
827 ncontext,
828 tcontext,
829 tclass);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 goto out;
831 }
832 constraint = constraint->next;
833 }
834
835out:
James Morris0804d112008-06-06 18:40:29 +1000836 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 return rc;
838}
839
Andrew Perepechkof9df6452015-12-24 11:09:41 -0500840int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
841 u16 tclass)
842{
843 return security_compute_validatetrans(oldsid, newsid, tasksid,
844 tclass, true);
845}
846
847int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
848 u16 orig_tclass)
849{
850 return security_compute_validatetrans(oldsid, newsid, tasksid,
851 orig_tclass, false);
852}
853
KaiGai Koheid9250de2008-08-28 16:35:57 +0900854/*
855 * security_bounded_transition - check whether the given
856 * transition is directed to bounded, or not.
857 * It returns 0, if @newsid is bounded by @oldsid.
858 * Otherwise, it returns error code.
859 *
860 * @oldsid : current security identifier
861 * @newsid : destinated security identifier
862 */
863int security_bounded_transition(u32 old_sid, u32 new_sid)
864{
865 struct context *old_context, *new_context;
866 struct type_datum *type;
867 int index;
Eric Paris4b02b522010-11-23 11:40:08 -0500868 int rc;
KaiGai Koheid9250de2008-08-28 16:35:57 +0900869
Paul Mooreca181452017-12-05 17:17:43 -0500870 if (!ss_initialized)
871 return 0;
872
KaiGai Koheid9250de2008-08-28 16:35:57 +0900873 read_lock(&policy_rwlock);
874
Eric Paris4b02b522010-11-23 11:40:08 -0500875 rc = -EINVAL;
KaiGai Koheid9250de2008-08-28 16:35:57 +0900876 old_context = sidtab_search(&sidtab, old_sid);
877 if (!old_context) {
878 printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n",
879 __func__, old_sid);
880 goto out;
881 }
882
Eric Paris4b02b522010-11-23 11:40:08 -0500883 rc = -EINVAL;
KaiGai Koheid9250de2008-08-28 16:35:57 +0900884 new_context = sidtab_search(&sidtab, new_sid);
885 if (!new_context) {
886 printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n",
887 __func__, new_sid);
888 goto out;
889 }
890
Eric Paris4b02b522010-11-23 11:40:08 -0500891 rc = 0;
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200892 /* type/domain unchanged */
Eric Paris4b02b522010-11-23 11:40:08 -0500893 if (old_context->type == new_context->type)
KaiGai Koheid9250de2008-08-28 16:35:57 +0900894 goto out;
KaiGai Koheid9250de2008-08-28 16:35:57 +0900895
896 index = new_context->type;
897 while (true) {
Eric Paris23bdecb2010-11-29 15:47:09 -0500898 type = flex_array_get_ptr(policydb.type_val_to_struct_array,
899 index - 1);
KaiGai Koheid9250de2008-08-28 16:35:57 +0900900 BUG_ON(!type);
901
902 /* not bounded anymore */
Eric Paris4b02b522010-11-23 11:40:08 -0500903 rc = -EPERM;
904 if (!type->bounds)
KaiGai Koheid9250de2008-08-28 16:35:57 +0900905 break;
KaiGai Koheid9250de2008-08-28 16:35:57 +0900906
907 /* @newsid is bounded by @oldsid */
Eric Paris4b02b522010-11-23 11:40:08 -0500908 rc = 0;
909 if (type->bounds == old_context->type)
KaiGai Koheid9250de2008-08-28 16:35:57 +0900910 break;
Eric Paris4b02b522010-11-23 11:40:08 -0500911
KaiGai Koheid9250de2008-08-28 16:35:57 +0900912 index = type->bounds;
913 }
KaiGai Kohei44c2d9b2009-06-18 17:26:13 +0900914
915 if (rc) {
916 char *old_name = NULL;
917 char *new_name = NULL;
James Morris2da5d312010-02-16 17:29:06 +1100918 u32 length;
KaiGai Kohei44c2d9b2009-06-18 17:26:13 +0900919
920 if (!context_struct_to_string(old_context,
921 &old_name, &length) &&
922 !context_struct_to_string(new_context,
923 &new_name, &length)) {
924 audit_log(current->audit_context,
925 GFP_ATOMIC, AUDIT_SELINUX_ERR,
926 "op=security_bounded_transition "
Richard Guy Briggs4093a842014-09-18 20:47:48 -0400927 "seresult=denied "
KaiGai Kohei44c2d9b2009-06-18 17:26:13 +0900928 "oldcontext=%s newcontext=%s",
929 old_name, new_name);
930 }
931 kfree(new_name);
932 kfree(old_name);
933 }
KaiGai Koheid9250de2008-08-28 16:35:57 +0900934out:
935 read_unlock(&policy_rwlock);
936
937 return rc;
938}
939
Stephen Smalley19439d02010-01-14 17:28:10 -0500940static void avd_init(struct av_decision *avd)
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400941{
Stephen Smalley19439d02010-01-14 17:28:10 -0500942 avd->allowed = 0;
943 avd->auditallow = 0;
944 avd->auditdeny = 0xffffffff;
945 avd->seqno = latest_granting;
946 avd->flags = 0;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400947}
948
Jeff Vander Stoepfa1aa142015-07-10 17:19:56 -0400949void services_compute_xperms_decision(struct extended_perms_decision *xpermd,
950 struct avtab_node *node)
951{
952 unsigned int i;
953
954 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) {
955 if (xpermd->driver != node->datum.u.xperms->driver)
956 return;
957 } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) {
958 if (!security_xperm_test(node->datum.u.xperms->perms.p,
959 xpermd->driver))
960 return;
961 } else {
962 BUG();
963 }
964
965 if (node->key.specified == AVTAB_XPERMS_ALLOWED) {
966 xpermd->used |= XPERMS_ALLOWED;
967 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) {
968 memset(xpermd->allowed->p, 0xff,
969 sizeof(xpermd->allowed->p));
970 }
971 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) {
972 for (i = 0; i < ARRAY_SIZE(xpermd->allowed->p); i++)
973 xpermd->allowed->p[i] |=
974 node->datum.u.xperms->perms.p[i];
975 }
976 } else if (node->key.specified == AVTAB_XPERMS_AUDITALLOW) {
977 xpermd->used |= XPERMS_AUDITALLOW;
978 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) {
979 memset(xpermd->auditallow->p, 0xff,
980 sizeof(xpermd->auditallow->p));
981 }
982 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) {
983 for (i = 0; i < ARRAY_SIZE(xpermd->auditallow->p); i++)
984 xpermd->auditallow->p[i] |=
985 node->datum.u.xperms->perms.p[i];
986 }
987 } else if (node->key.specified == AVTAB_XPERMS_DONTAUDIT) {
988 xpermd->used |= XPERMS_DONTAUDIT;
989 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) {
990 memset(xpermd->dontaudit->p, 0xff,
991 sizeof(xpermd->dontaudit->p));
992 }
993 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) {
994 for (i = 0; i < ARRAY_SIZE(xpermd->dontaudit->p); i++)
995 xpermd->dontaudit->p[i] |=
996 node->datum.u.xperms->perms.p[i];
997 }
998 } else {
999 BUG();
1000 }
1001}
1002
1003void security_compute_xperms_decision(u32 ssid,
1004 u32 tsid,
1005 u16 orig_tclass,
1006 u8 driver,
1007 struct extended_perms_decision *xpermd)
1008{
1009 u16 tclass;
1010 struct context *scontext, *tcontext;
1011 struct avtab_key avkey;
1012 struct avtab_node *node;
1013 struct ebitmap *sattr, *tattr;
1014 struct ebitmap_node *snode, *tnode;
1015 unsigned int i, j;
1016
1017 xpermd->driver = driver;
1018 xpermd->used = 0;
1019 memset(xpermd->allowed->p, 0, sizeof(xpermd->allowed->p));
1020 memset(xpermd->auditallow->p, 0, sizeof(xpermd->auditallow->p));
1021 memset(xpermd->dontaudit->p, 0, sizeof(xpermd->dontaudit->p));
1022
1023 read_lock(&policy_rwlock);
1024 if (!ss_initialized)
1025 goto allow;
1026
1027 scontext = sidtab_search(&sidtab, ssid);
1028 if (!scontext) {
1029 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
1030 __func__, ssid);
1031 goto out;
1032 }
1033
1034 tcontext = sidtab_search(&sidtab, tsid);
1035 if (!tcontext) {
1036 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
1037 __func__, tsid);
1038 goto out;
1039 }
1040
1041 tclass = unmap_class(orig_tclass);
1042 if (unlikely(orig_tclass && !tclass)) {
1043 if (policydb.allow_unknown)
1044 goto allow;
1045 goto out;
1046 }
1047
1048
1049 if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) {
1050 pr_warn_ratelimited("SELinux: Invalid class %hu\n", tclass);
1051 goto out;
1052 }
1053
1054 avkey.target_class = tclass;
1055 avkey.specified = AVTAB_XPERMS;
1056 sattr = flex_array_get(policydb.type_attr_map_array,
1057 scontext->type - 1);
1058 BUG_ON(!sattr);
1059 tattr = flex_array_get(policydb.type_attr_map_array,
1060 tcontext->type - 1);
1061 BUG_ON(!tattr);
1062 ebitmap_for_each_positive_bit(sattr, snode, i) {
1063 ebitmap_for_each_positive_bit(tattr, tnode, j) {
1064 avkey.source_type = i + 1;
1065 avkey.target_type = j + 1;
1066 for (node = avtab_search_node(&policydb.te_avtab, &avkey);
1067 node;
1068 node = avtab_search_node_next(node, avkey.specified))
1069 services_compute_xperms_decision(xpermd, node);
1070
1071 cond_compute_xperms(&policydb.te_cond_avtab,
1072 &avkey, xpermd);
1073 }
1074 }
1075out:
1076 read_unlock(&policy_rwlock);
1077 return;
1078allow:
1079 memset(xpermd->allowed->p, 0xff, sizeof(xpermd->allowed->p));
1080 goto out;
1081}
Stephen Smalley19439d02010-01-14 17:28:10 -05001082
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083/**
1084 * security_compute_av - Compute access vector decisions.
1085 * @ssid: source security identifier
1086 * @tsid: target security identifier
1087 * @tclass: target security class
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 * @avd: access vector decisions
Jeff Vander Stoepfa1aa142015-07-10 17:19:56 -04001089 * @xperms: extended permissions
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 *
1091 * Compute a set of access vector decisions based on the
1092 * SID pair (@ssid, @tsid) for the permissions in @tclass.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 */
Stephen Smalley19439d02010-01-14 17:28:10 -05001094void security_compute_av(u32 ssid,
1095 u32 tsid,
1096 u16 orig_tclass,
Jeff Vander Stoepfa1aa142015-07-10 17:19:56 -04001097 struct av_decision *avd,
1098 struct extended_perms *xperms)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099{
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001100 u16 tclass;
Stephen Smalley19439d02010-01-14 17:28:10 -05001101 struct context *scontext = NULL, *tcontext = NULL;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001102
Stephen Smalleyb7f30082009-10-19 10:08:50 -04001103 read_lock(&policy_rwlock);
Stephen Smalley19439d02010-01-14 17:28:10 -05001104 avd_init(avd);
Jeff Vander Stoepfa1aa142015-07-10 17:19:56 -04001105 xperms->len = 0;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001106 if (!ss_initialized)
1107 goto allow;
1108
Stephen Smalley19439d02010-01-14 17:28:10 -05001109 scontext = sidtab_search(&sidtab, ssid);
1110 if (!scontext) {
1111 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
1112 __func__, ssid);
1113 goto out;
1114 }
1115
1116 /* permissive domain? */
1117 if (ebitmap_get_bit(&policydb.permissive_map, scontext->type))
1118 avd->flags |= AVD_FLAGS_PERMISSIVE;
1119
1120 tcontext = sidtab_search(&sidtab, tsid);
1121 if (!tcontext) {
1122 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
1123 __func__, tsid);
1124 goto out;
1125 }
1126
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001127 tclass = unmap_class(orig_tclass);
1128 if (unlikely(orig_tclass && !tclass)) {
1129 if (policydb.allow_unknown)
1130 goto allow;
Stephen Smalleyb7f30082009-10-19 10:08:50 -04001131 goto out;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001132 }
Jeff Vander Stoepfa1aa142015-07-10 17:19:56 -04001133 context_struct_compute_av(scontext, tcontext, tclass, avd, xperms);
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001134 map_decision(orig_tclass, avd, policydb.allow_unknown);
Stephen Smalleyb7f30082009-10-19 10:08:50 -04001135out:
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001136 read_unlock(&policy_rwlock);
Stephen Smalley19439d02010-01-14 17:28:10 -05001137 return;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001138allow:
1139 avd->allowed = 0xffffffff;
Stephen Smalleyb7f30082009-10-19 10:08:50 -04001140 goto out;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001141}
1142
Stephen Smalley19439d02010-01-14 17:28:10 -05001143void security_compute_av_user(u32 ssid,
1144 u32 tsid,
1145 u16 tclass,
1146 struct av_decision *avd)
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001147{
Stephen Smalley19439d02010-01-14 17:28:10 -05001148 struct context *scontext = NULL, *tcontext = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149
James Morris0804d112008-06-06 18:40:29 +10001150 read_lock(&policy_rwlock);
Stephen Smalley19439d02010-01-14 17:28:10 -05001151 avd_init(avd);
1152 if (!ss_initialized)
1153 goto allow;
1154
1155 scontext = sidtab_search(&sidtab, ssid);
1156 if (!scontext) {
1157 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
1158 __func__, ssid);
1159 goto out;
1160 }
1161
1162 /* permissive domain? */
1163 if (ebitmap_get_bit(&policydb.permissive_map, scontext->type))
1164 avd->flags |= AVD_FLAGS_PERMISSIVE;
1165
1166 tcontext = sidtab_search(&sidtab, tsid);
1167 if (!tcontext) {
1168 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
1169 __func__, tsid);
1170 goto out;
1171 }
1172
1173 if (unlikely(!tclass)) {
1174 if (policydb.allow_unknown)
1175 goto allow;
1176 goto out;
1177 }
1178
Jeff Vander Stoepfa1aa142015-07-10 17:19:56 -04001179 context_struct_compute_av(scontext, tcontext, tclass, avd, NULL);
Stephen Smalley19439d02010-01-14 17:28:10 -05001180 out:
James Morris0804d112008-06-06 18:40:29 +10001181 read_unlock(&policy_rwlock);
Stephen Smalley19439d02010-01-14 17:28:10 -05001182 return;
1183allow:
1184 avd->allowed = 0xffffffff;
1185 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186}
1187
1188/*
1189 * Write the security context string representation of
1190 * the context structure `context' into a dynamically
1191 * allocated string of the correct size. Set `*scontext'
1192 * to point to this string and set `*scontext_len' to
1193 * the length of the string.
1194 */
1195static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len)
1196{
1197 char *scontextp;
1198
Eric Parisd5630b92010-10-13 16:24:48 -04001199 if (scontext)
1200 *scontext = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 *scontext_len = 0;
1202
Stephen Smalley12b29f32008-05-07 13:03:20 -04001203 if (context->len) {
1204 *scontext_len = context->len;
Eric Parisbb7081a2012-04-04 13:46:36 -04001205 if (scontext) {
1206 *scontext = kstrdup(context->str, GFP_ATOMIC);
1207 if (!(*scontext))
1208 return -ENOMEM;
1209 }
Stephen Smalley12b29f32008-05-07 13:03:20 -04001210 return 0;
1211 }
1212
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 /* Compute the size of the context. */
Eric Parisac76c052010-11-29 15:47:09 -05001214 *scontext_len += strlen(sym_name(&policydb, SYM_USERS, context->user - 1)) + 1;
1215 *scontext_len += strlen(sym_name(&policydb, SYM_ROLES, context->role - 1)) + 1;
1216 *scontext_len += strlen(sym_name(&policydb, SYM_TYPES, context->type - 1)) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 *scontext_len += mls_compute_context_len(context);
1218
Eric Parisd5630b92010-10-13 16:24:48 -04001219 if (!scontext)
1220 return 0;
1221
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 /* Allocate space for the context; caller must free this space. */
1223 scontextp = kmalloc(*scontext_len, GFP_ATOMIC);
Eric Paris5d55a342008-04-18 17:38:33 -04001224 if (!scontextp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 *scontext = scontextp;
1227
1228 /*
1229 * Copy the user name, role name and type name into the context.
1230 */
Rasmus Villemoes9529c782015-10-21 17:44:27 -04001231 scontextp += sprintf(scontextp, "%s:%s:%s",
Eric Parisac76c052010-11-29 15:47:09 -05001232 sym_name(&policydb, SYM_USERS, context->user - 1),
1233 sym_name(&policydb, SYM_ROLES, context->role - 1),
1234 sym_name(&policydb, SYM_TYPES, context->type - 1));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235
1236 mls_sid_to_context(context, &scontextp);
1237
1238 *scontextp = 0;
1239
1240 return 0;
1241}
1242
1243#include "initial_sid_to_string.h"
1244
James Carterf0ee2e42007-04-04 10:11:29 -04001245const char *security_get_initial_sid_context(u32 sid)
1246{
1247 if (unlikely(sid > SECINITSID_NUM))
1248 return NULL;
1249 return initial_sid_to_string[sid];
1250}
1251
Stephen Smalley12b29f32008-05-07 13:03:20 -04001252static int security_sid_to_context_core(u32 sid, char **scontext,
1253 u32 *scontext_len, int force)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254{
1255 struct context *context;
1256 int rc = 0;
1257
Eric Parisd5630b92010-10-13 16:24:48 -04001258 if (scontext)
1259 *scontext = NULL;
Stephen Smalley4f4acf32007-02-26 12:02:34 -05001260 *scontext_len = 0;
1261
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 if (!ss_initialized) {
1263 if (sid <= SECINITSID_NUM) {
1264 char *scontextp;
1265
1266 *scontext_len = strlen(initial_sid_to_string[sid]) + 1;
Eric Parisd5630b92010-10-13 16:24:48 -04001267 if (!scontext)
1268 goto out;
Rasmus Villemoesaa736c32015-10-21 17:44:26 -04001269 scontextp = kmemdup(initial_sid_to_string[sid],
1270 *scontext_len, GFP_ATOMIC);
Serge E. Hallyn0cccca062006-05-15 09:43:48 -07001271 if (!scontextp) {
1272 rc = -ENOMEM;
1273 goto out;
1274 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 *scontext = scontextp;
1276 goto out;
1277 }
Eric Paris744ba352008-04-17 11:52:44 -04001278 printk(KERN_ERR "SELinux: %s: called before initial "
1279 "load_policy on unknown SID %d\n", __func__, sid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280 rc = -EINVAL;
1281 goto out;
1282 }
James Morris0804d112008-06-06 18:40:29 +10001283 read_lock(&policy_rwlock);
Stephen Smalley12b29f32008-05-07 13:03:20 -04001284 if (force)
1285 context = sidtab_search_force(&sidtab, sid);
1286 else
1287 context = sidtab_search(&sidtab, sid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 if (!context) {
Eric Paris744ba352008-04-17 11:52:44 -04001289 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
1290 __func__, sid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 rc = -EINVAL;
1292 goto out_unlock;
1293 }
1294 rc = context_struct_to_string(context, scontext, scontext_len);
1295out_unlock:
James Morris0804d112008-06-06 18:40:29 +10001296 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297out:
1298 return rc;
1299
1300}
1301
Stephen Smalley12b29f32008-05-07 13:03:20 -04001302/**
1303 * security_sid_to_context - Obtain a context for a given SID.
1304 * @sid: security identifier, SID
1305 * @scontext: security context
1306 * @scontext_len: length in bytes
1307 *
1308 * Write the string representation of the context associated with @sid
1309 * into a dynamically allocated string of the correct size. Set @scontext
1310 * to point to this string and set @scontext_len to the length of the string.
1311 */
1312int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313{
Stephen Smalley12b29f32008-05-07 13:03:20 -04001314 return security_sid_to_context_core(sid, scontext, scontext_len, 0);
1315}
1316
1317int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len)
1318{
1319 return security_sid_to_context_core(sid, scontext, scontext_len, 1);
1320}
1321
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001322/*
1323 * Caveat: Mutates scontext.
1324 */
Stephen Smalley12b29f32008-05-07 13:03:20 -04001325static int string_to_context_struct(struct policydb *pol,
1326 struct sidtab *sidtabp,
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001327 char *scontext,
Stephen Smalley12b29f32008-05-07 13:03:20 -04001328 u32 scontext_len,
1329 struct context *ctx,
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001330 u32 def_sid)
Stephen Smalley12b29f32008-05-07 13:03:20 -04001331{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 struct role_datum *role;
1333 struct type_datum *typdatum;
1334 struct user_datum *usrdatum;
1335 char *scontextp, *p, oldc;
1336 int rc = 0;
1337
Stephen Smalley12b29f32008-05-07 13:03:20 -04001338 context_init(ctx);
1339
Stephen Smalley12b29f32008-05-07 13:03:20 -04001340 /* Parse the security context. */
1341
1342 rc = -EINVAL;
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001343 scontextp = (char *) scontext;
Stephen Smalley12b29f32008-05-07 13:03:20 -04001344
1345 /* Extract the user. */
1346 p = scontextp;
1347 while (*p && *p != ':')
1348 p++;
1349
1350 if (*p == 0)
1351 goto out;
1352
1353 *p++ = 0;
1354
1355 usrdatum = hashtab_search(pol->p_users.table, scontextp);
1356 if (!usrdatum)
1357 goto out;
1358
1359 ctx->user = usrdatum->value;
1360
1361 /* Extract role. */
1362 scontextp = p;
1363 while (*p && *p != ':')
1364 p++;
1365
1366 if (*p == 0)
1367 goto out;
1368
1369 *p++ = 0;
1370
1371 role = hashtab_search(pol->p_roles.table, scontextp);
1372 if (!role)
1373 goto out;
1374 ctx->role = role->value;
1375
1376 /* Extract type. */
1377 scontextp = p;
1378 while (*p && *p != ':')
1379 p++;
1380 oldc = *p;
1381 *p++ = 0;
1382
1383 typdatum = hashtab_search(pol->p_types.table, scontextp);
KaiGai Koheid9250de2008-08-28 16:35:57 +09001384 if (!typdatum || typdatum->attribute)
Stephen Smalley12b29f32008-05-07 13:03:20 -04001385 goto out;
1386
1387 ctx->type = typdatum->value;
1388
1389 rc = mls_context_to_sid(pol, oldc, &p, ctx, sidtabp, def_sid);
1390 if (rc)
1391 goto out;
1392
Eric Paris4b02b522010-11-23 11:40:08 -05001393 rc = -EINVAL;
1394 if ((p - scontext) < scontext_len)
Stephen Smalley12b29f32008-05-07 13:03:20 -04001395 goto out;
Stephen Smalley12b29f32008-05-07 13:03:20 -04001396
1397 /* Check the validity of the new context. */
Eric Paris4b02b522010-11-23 11:40:08 -05001398 if (!policydb_context_isvalid(pol, ctx))
Stephen Smalley12b29f32008-05-07 13:03:20 -04001399 goto out;
Stephen Smalley12b29f32008-05-07 13:03:20 -04001400 rc = 0;
1401out:
Eric Paris8e531af2008-09-03 11:49:47 -04001402 if (rc)
1403 context_destroy(ctx);
Stephen Smalley12b29f32008-05-07 13:03:20 -04001404 return rc;
1405}
1406
1407static int security_context_to_sid_core(const char *scontext, u32 scontext_len,
1408 u32 *sid, u32 def_sid, gfp_t gfp_flags,
1409 int force)
1410{
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001411 char *scontext2, *str = NULL;
Stephen Smalley12b29f32008-05-07 13:03:20 -04001412 struct context context;
1413 int rc = 0;
1414
Stephen Smalley2172fa72014-01-30 11:26:59 -05001415 /* An empty security context is never valid. */
1416 if (!scontext_len)
1417 return -EINVAL;
1418
Paul Moore116df862017-11-28 18:51:12 -05001419 /* Copy the string to allow changes and ensure a NUL terminator */
1420 scontext2 = kmemdup_nul(scontext, scontext_len, gfp_flags);
1421 if (!scontext2)
1422 return -ENOMEM;
1423
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 if (!ss_initialized) {
1425 int i;
1426
1427 for (i = 1; i < SECINITSID_NUM; i++) {
Paul Moore116df862017-11-28 18:51:12 -05001428 if (!strcmp(initial_sid_to_string[i], scontext2)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 *sid = i;
Paul Moore116df862017-11-28 18:51:12 -05001430 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431 }
1432 }
1433 *sid = SECINITSID_KERNEL;
Paul Moore116df862017-11-28 18:51:12 -05001434 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435 }
1436 *sid = SECSID_NULL;
1437
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001438 if (force) {
1439 /* Save another copy for storing in uninterpreted form */
Eric Paris4b02b522010-11-23 11:40:08 -05001440 rc = -ENOMEM;
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001441 str = kstrdup(scontext2, gfp_flags);
Eric Paris4b02b522010-11-23 11:40:08 -05001442 if (!str)
1443 goto out;
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001444 }
1445
James Morris0804d112008-06-06 18:40:29 +10001446 read_lock(&policy_rwlock);
Eric Paris4b02b522010-11-23 11:40:08 -05001447 rc = string_to_context_struct(&policydb, &sidtab, scontext2,
1448 scontext_len, &context, def_sid);
Stephen Smalley12b29f32008-05-07 13:03:20 -04001449 if (rc == -EINVAL && force) {
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001450 context.str = str;
Sachin Grover9808c972018-05-25 14:01:39 +05301451 context.len = strlen(str) + 1;
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001452 str = NULL;
Stephen Smalley12b29f32008-05-07 13:03:20 -04001453 } else if (rc)
Eric Paris4b02b522010-11-23 11:40:08 -05001454 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455 rc = sidtab_context_to_sid(&sidtab, &context, sid);
Eric Paris8e531af2008-09-03 11:49:47 -04001456 context_destroy(&context);
Eric Paris4b02b522010-11-23 11:40:08 -05001457out_unlock:
James Morris0804d112008-06-06 18:40:29 +10001458 read_unlock(&policy_rwlock);
Eric Paris4b02b522010-11-23 11:40:08 -05001459out:
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001460 kfree(scontext2);
1461 kfree(str);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462 return rc;
1463}
1464
James Morrisf5c1d5b2005-07-28 01:07:37 -07001465/**
1466 * security_context_to_sid - Obtain a SID for a given security context.
1467 * @scontext: security context
1468 * @scontext_len: length in bytes
1469 * @sid: security identifier, SID
Nikolay Aleksandrov52a4c642014-03-07 12:44:19 +01001470 * @gfp: context for the allocation
James Morrisf5c1d5b2005-07-28 01:07:37 -07001471 *
1472 * Obtains a SID associated with the security context that
1473 * has the string representation specified by @scontext.
1474 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
1475 * memory is available, or 0 on success.
1476 */
Nikolay Aleksandrov52a4c642014-03-07 12:44:19 +01001477int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid,
1478 gfp_t gfp)
James Morrisf5c1d5b2005-07-28 01:07:37 -07001479{
1480 return security_context_to_sid_core(scontext, scontext_len,
Nikolay Aleksandrov52a4c642014-03-07 12:44:19 +01001481 sid, SECSID_NULL, gfp, 0);
James Morrisf5c1d5b2005-07-28 01:07:37 -07001482}
1483
Rasmus Villemoes44be2f62015-10-21 17:44:25 -04001484int security_context_str_to_sid(const char *scontext, u32 *sid, gfp_t gfp)
1485{
1486 return security_context_to_sid(scontext, strlen(scontext), sid, gfp);
1487}
1488
James Morrisf5c1d5b2005-07-28 01:07:37 -07001489/**
1490 * security_context_to_sid_default - Obtain a SID for a given security context,
1491 * falling back to specified default if needed.
1492 *
1493 * @scontext: security context
1494 * @scontext_len: length in bytes
1495 * @sid: security identifier, SID
Gabriel Craciunescud133a962007-07-31 00:39:19 -07001496 * @def_sid: default SID to assign on error
James Morrisf5c1d5b2005-07-28 01:07:37 -07001497 *
1498 * Obtains a SID associated with the security context that
1499 * has the string representation specified by @scontext.
1500 * The default SID is passed to the MLS layer to be used to allow
1501 * kernel labeling of the MLS field if the MLS field is not present
1502 * (for upgrading to MLS without full relabel).
Stephen Smalley12b29f32008-05-07 13:03:20 -04001503 * Implicitly forces adding of the context even if it cannot be mapped yet.
James Morrisf5c1d5b2005-07-28 01:07:37 -07001504 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
1505 * memory is available, or 0 on success.
1506 */
David Howells7bf570d2008-04-29 20:52:51 +01001507int security_context_to_sid_default(const char *scontext, u32 scontext_len,
1508 u32 *sid, u32 def_sid, gfp_t gfp_flags)
James Morrisf5c1d5b2005-07-28 01:07:37 -07001509{
1510 return security_context_to_sid_core(scontext, scontext_len,
Stephen Smalley12b29f32008-05-07 13:03:20 -04001511 sid, def_sid, gfp_flags, 1);
1512}
1513
1514int security_context_to_sid_force(const char *scontext, u32 scontext_len,
1515 u32 *sid)
1516{
1517 return security_context_to_sid_core(scontext, scontext_len,
1518 sid, SECSID_NULL, GFP_KERNEL, 1);
James Morrisf5c1d5b2005-07-28 01:07:37 -07001519}
1520
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521static int compute_sid_handle_invalid_context(
1522 struct context *scontext,
1523 struct context *tcontext,
1524 u16 tclass,
1525 struct context *newcontext)
1526{
1527 char *s = NULL, *t = NULL, *n = NULL;
1528 u32 slen, tlen, nlen;
1529
Eric Paris4b02b522010-11-23 11:40:08 -05001530 if (context_struct_to_string(scontext, &s, &slen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 goto out;
Eric Paris4b02b522010-11-23 11:40:08 -05001532 if (context_struct_to_string(tcontext, &t, &tlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533 goto out;
Eric Paris4b02b522010-11-23 11:40:08 -05001534 if (context_struct_to_string(newcontext, &n, &nlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535 goto out;
David Woodhouse9ad9ad32005-06-22 15:04:33 +01001536 audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
Richard Guy Briggs4093a842014-09-18 20:47:48 -04001537 "op=security_compute_sid invalid_context=%s"
1538 " scontext=%s"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539 " tcontext=%s"
1540 " tclass=%s",
Eric Parisac76c052010-11-29 15:47:09 -05001541 n, s, t, sym_name(&policydb, SYM_CLASSES, tclass-1));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542out:
1543 kfree(s);
1544 kfree(t);
1545 kfree(n);
1546 if (!selinux_enforcing)
1547 return 0;
1548 return -EACCES;
1549}
1550
Eric Paris652bb9b2011-02-01 11:05:40 -05001551static void filename_compute_type(struct policydb *p, struct context *newcontext,
Eric Paris26679912011-04-28 15:11:20 -04001552 u32 stype, u32 ttype, u16 tclass,
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +01001553 const char *objname)
Eric Paris652bb9b2011-02-01 11:05:40 -05001554{
Eric Paris2463c26d2011-04-28 15:11:21 -04001555 struct filename_trans ft;
1556 struct filename_trans_datum *otype;
Eric Paris03a4c012011-04-28 15:11:21 -04001557
1558 /*
1559 * Most filename trans rules are going to live in specific directories
1560 * like /dev or /var/run. This bitmap will quickly skip rule searches
1561 * if the ttype does not contain any rules.
1562 */
1563 if (!ebitmap_get_bit(&p->filename_trans_ttypes, ttype))
1564 return;
1565
Eric Paris2463c26d2011-04-28 15:11:21 -04001566 ft.stype = stype;
1567 ft.ttype = ttype;
1568 ft.tclass = tclass;
1569 ft.name = objname;
1570
1571 otype = hashtab_search(p->filename_trans, &ft);
1572 if (otype)
1573 newcontext->type = otype->otype;
Eric Paris652bb9b2011-02-01 11:05:40 -05001574}
1575
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576static int security_compute_sid(u32 ssid,
1577 u32 tsid,
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001578 u16 orig_tclass,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 u32 specified,
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +01001580 const char *objname,
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001581 u32 *out_sid,
1582 bool kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583{
Eric Parisaa893262012-03-20 14:35:12 -04001584 struct class_datum *cladatum = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585 struct context *scontext = NULL, *tcontext = NULL, newcontext;
1586 struct role_trans *roletr = NULL;
1587 struct avtab_key avkey;
1588 struct avtab_datum *avdatum;
1589 struct avtab_node *node;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001590 u16 tclass;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591 int rc = 0;
Harry Ciao6f5317e2011-03-02 13:32:33 +08001592 bool sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593
1594 if (!ss_initialized) {
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001595 switch (orig_tclass) {
1596 case SECCLASS_PROCESS: /* kernel value */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597 *out_sid = ssid;
1598 break;
1599 default:
1600 *out_sid = tsid;
1601 break;
1602 }
1603 goto out;
1604 }
1605
Venkat Yekkirala851f8a62006-07-30 03:03:18 -07001606 context_init(&newcontext);
1607
James Morris0804d112008-06-06 18:40:29 +10001608 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609
Harry Ciao6f5317e2011-03-02 13:32:33 +08001610 if (kern) {
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001611 tclass = unmap_class(orig_tclass);
Harry Ciao6f5317e2011-03-02 13:32:33 +08001612 sock = security_is_socket_class(orig_tclass);
1613 } else {
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001614 tclass = orig_tclass;
Harry Ciao6f5317e2011-03-02 13:32:33 +08001615 sock = security_is_socket_class(map_class(tclass));
1616 }
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001617
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618 scontext = sidtab_search(&sidtab, ssid);
1619 if (!scontext) {
Eric Paris744ba352008-04-17 11:52:44 -04001620 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
1621 __func__, ssid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622 rc = -EINVAL;
1623 goto out_unlock;
1624 }
1625 tcontext = sidtab_search(&sidtab, tsid);
1626 if (!tcontext) {
Eric Paris744ba352008-04-17 11:52:44 -04001627 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
1628 __func__, tsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629 rc = -EINVAL;
1630 goto out_unlock;
1631 }
1632
Eric Parisaa893262012-03-20 14:35:12 -04001633 if (tclass && tclass <= policydb.p_classes.nprim)
1634 cladatum = policydb.class_val_to_struct[tclass - 1];
1635
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636 /* Set the user identity. */
1637 switch (specified) {
1638 case AVTAB_TRANSITION:
1639 case AVTAB_CHANGE:
Eric Parisaa893262012-03-20 14:35:12 -04001640 if (cladatum && cladatum->default_user == DEFAULT_TARGET) {
1641 newcontext.user = tcontext->user;
1642 } else {
1643 /* notice this gets both DEFAULT_SOURCE and unset */
1644 /* Use the process user identity. */
1645 newcontext.user = scontext->user;
1646 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647 break;
1648 case AVTAB_MEMBER:
1649 /* Use the related object owner. */
1650 newcontext.user = tcontext->user;
1651 break;
1652 }
1653
Eric Parisaa893262012-03-20 14:35:12 -04001654 /* Set the role to default values. */
1655 if (cladatum && cladatum->default_role == DEFAULT_SOURCE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 newcontext.role = scontext->role;
Eric Parisaa893262012-03-20 14:35:12 -04001657 } else if (cladatum && cladatum->default_role == DEFAULT_TARGET) {
1658 newcontext.role = tcontext->role;
1659 } else {
1660 if ((tclass == policydb.process_class) || (sock == true))
1661 newcontext.role = scontext->role;
1662 else
1663 newcontext.role = OBJECT_R_VAL;
1664 }
1665
1666 /* Set the type to default values. */
Eric Pariseed77952012-03-20 14:35:12 -04001667 if (cladatum && cladatum->default_type == DEFAULT_SOURCE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668 newcontext.type = scontext->type;
Eric Pariseed77952012-03-20 14:35:12 -04001669 } else if (cladatum && cladatum->default_type == DEFAULT_TARGET) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 newcontext.type = tcontext->type;
Eric Pariseed77952012-03-20 14:35:12 -04001671 } else {
1672 if ((tclass == policydb.process_class) || (sock == true)) {
1673 /* Use the type of process. */
1674 newcontext.type = scontext->type;
1675 } else {
1676 /* Use the type of the related object. */
1677 newcontext.type = tcontext->type;
1678 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 }
1680
1681 /* Look for a type transition/member/change rule. */
1682 avkey.source_type = scontext->type;
1683 avkey.target_type = tcontext->type;
1684 avkey.target_class = tclass;
Stephen Smalley782ebb92005-09-03 15:55:16 -07001685 avkey.specified = specified;
1686 avdatum = avtab_search(&policydb.te_avtab, &avkey);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687
1688 /* If no permanent rule, also check for enabled conditional rules */
Eric Paris5d55a342008-04-18 17:38:33 -04001689 if (!avdatum) {
Stephen Smalley782ebb92005-09-03 15:55:16 -07001690 node = avtab_search_node(&policydb.te_cond_avtab, &avkey);
Vesa-Matti Karidbc74c62008-08-07 03:18:20 +03001691 for (; node; node = avtab_search_node_next(node, specified)) {
Stephen Smalley782ebb92005-09-03 15:55:16 -07001692 if (node->key.specified & AVTAB_ENABLED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 avdatum = &node->datum;
1694 break;
1695 }
1696 }
1697 }
1698
Stephen Smalley782ebb92005-09-03 15:55:16 -07001699 if (avdatum) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 /* Use the type from the type transition/member/change rule. */
Jeff Vander Stoepfa1aa142015-07-10 17:19:56 -04001701 newcontext.type = avdatum->u.data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702 }
1703
Eric Paris47426002011-04-28 15:11:20 -04001704 /* if we have a objname this is a file trans check so check those rules */
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +01001705 if (objname)
Eric Paris652bb9b2011-02-01 11:05:40 -05001706 filename_compute_type(&policydb, &newcontext, scontext->type,
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +01001707 tcontext->type, tclass, objname);
Eric Paris652bb9b2011-02-01 11:05:40 -05001708
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 /* Check for class-specific changes. */
Harry Ciao63a312c2011-03-25 13:51:58 +08001710 if (specified & AVTAB_TRANSITION) {
1711 /* Look for a role transition rule. */
1712 for (roletr = policydb.role_tr; roletr; roletr = roletr->next) {
1713 if ((roletr->role == scontext->role) &&
1714 (roletr->type == tcontext->type) &&
1715 (roletr->tclass == tclass)) {
1716 /* Use the role transition rule. */
1717 newcontext.role = roletr->new_role;
1718 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719 }
1720 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721 }
1722
1723 /* Set the MLS attributes.
1724 This is done last because it may allocate memory. */
Harry Ciao6f5317e2011-03-02 13:32:33 +08001725 rc = mls_compute_sid(scontext, tcontext, tclass, specified,
1726 &newcontext, sock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727 if (rc)
1728 goto out_unlock;
1729
1730 /* Check the validity of the context. */
1731 if (!policydb_context_isvalid(&policydb, &newcontext)) {
1732 rc = compute_sid_handle_invalid_context(scontext,
1733 tcontext,
1734 tclass,
1735 &newcontext);
1736 if (rc)
1737 goto out_unlock;
1738 }
1739 /* Obtain the sid for the context. */
1740 rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid);
1741out_unlock:
James Morris0804d112008-06-06 18:40:29 +10001742 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743 context_destroy(&newcontext);
1744out:
1745 return rc;
1746}
1747
1748/**
1749 * security_transition_sid - Compute the SID for a new subject/object.
1750 * @ssid: source security identifier
1751 * @tsid: target security identifier
1752 * @tclass: target security class
1753 * @out_sid: security identifier for new subject/object
1754 *
1755 * Compute a SID to use for labeling a new subject or object in the
1756 * class @tclass based on a SID pair (@ssid, @tsid).
1757 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1758 * if insufficient memory is available, or %0 if the new SID was
1759 * computed successfully.
1760 */
Eric Paris652bb9b2011-02-01 11:05:40 -05001761int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
1762 const struct qstr *qstr, u32 *out_sid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763{
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001764 return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION,
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +01001765 qstr ? qstr->name : NULL, out_sid, true);
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001766}
1767
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +01001768int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
1769 const char *objname, u32 *out_sid)
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001770{
1771 return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION,
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +01001772 objname, out_sid, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773}
1774
1775/**
1776 * security_member_sid - Compute the SID for member selection.
1777 * @ssid: source security identifier
1778 * @tsid: target security identifier
1779 * @tclass: target security class
1780 * @out_sid: security identifier for selected member
1781 *
1782 * Compute a SID to use when selecting a member of a polyinstantiated
1783 * object of class @tclass based on a SID pair (@ssid, @tsid).
1784 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1785 * if insufficient memory is available, or %0 if the SID was
1786 * computed successfully.
1787 */
1788int security_member_sid(u32 ssid,
1789 u32 tsid,
1790 u16 tclass,
1791 u32 *out_sid)
1792{
Eric Paris652bb9b2011-02-01 11:05:40 -05001793 return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, NULL,
1794 out_sid, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795}
1796
1797/**
1798 * security_change_sid - Compute the SID for object relabeling.
1799 * @ssid: source security identifier
1800 * @tsid: target security identifier
1801 * @tclass: target security class
1802 * @out_sid: security identifier for selected member
1803 *
1804 * Compute a SID to use for relabeling an object of class @tclass
1805 * based on a SID pair (@ssid, @tsid).
1806 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1807 * if insufficient memory is available, or %0 if the SID was
1808 * computed successfully.
1809 */
1810int security_change_sid(u32 ssid,
1811 u32 tsid,
1812 u16 tclass,
1813 u32 *out_sid)
1814{
Eric Paris652bb9b2011-02-01 11:05:40 -05001815 return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, NULL,
1816 out_sid, false);
Chad Sellersb94c7e62006-11-06 12:38:18 -05001817}
1818
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819/* Clone the SID into the new SID table. */
1820static int clone_sid(u32 sid,
1821 struct context *context,
1822 void *arg)
1823{
1824 struct sidtab *s = arg;
1825
Guido Trentalancia42596ea2010-02-03 17:06:01 +01001826 if (sid > SECINITSID_NUM)
1827 return sidtab_insert(s, sid, context);
1828 else
1829 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830}
1831
1832static inline int convert_context_handle_invalid_context(struct context *context)
1833{
Eric Paris4b02b522010-11-23 11:40:08 -05001834 char *s;
1835 u32 len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836
Eric Paris4b02b522010-11-23 11:40:08 -05001837 if (selinux_enforcing)
1838 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839
Eric Paris4b02b522010-11-23 11:40:08 -05001840 if (!context_struct_to_string(context, &s, &len)) {
1841 printk(KERN_WARNING "SELinux: Context %s would be invalid if enforcing\n", s);
1842 kfree(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843 }
Eric Paris4b02b522010-11-23 11:40:08 -05001844 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001845}
1846
1847struct convert_context_args {
1848 struct policydb *oldp;
1849 struct policydb *newp;
1850};
1851
1852/*
1853 * Convert the values in the security context
1854 * structure `c' from the values specified
1855 * in the policy `p->oldp' to the values specified
1856 * in the policy `p->newp'. Verify that the
1857 * context is valid under the new policy.
1858 */
1859static int convert_context(u32 key,
1860 struct context *c,
1861 void *p)
1862{
1863 struct convert_context_args *args;
1864 struct context oldc;
Guido Trentalancia0719aaf2010-02-03 16:40:20 +01001865 struct ocontext *oc;
1866 struct mls_range *range;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867 struct role_datum *role;
1868 struct type_datum *typdatum;
1869 struct user_datum *usrdatum;
1870 char *s;
1871 u32 len;
Guido Trentalancia42596ea2010-02-03 17:06:01 +01001872 int rc = 0;
1873
1874 if (key <= SECINITSID_NUM)
1875 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876
1877 args = p;
1878
Stephen Smalley12b29f32008-05-07 13:03:20 -04001879 if (c->str) {
1880 struct context ctx;
Eric Paris4b02b522010-11-23 11:40:08 -05001881
1882 rc = -ENOMEM;
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001883 s = kstrdup(c->str, GFP_KERNEL);
Eric Paris4b02b522010-11-23 11:40:08 -05001884 if (!s)
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001885 goto out;
Eric Paris4b02b522010-11-23 11:40:08 -05001886
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001887 rc = string_to_context_struct(args->newp, NULL, s,
1888 c->len, &ctx, SECSID_NULL);
1889 kfree(s);
Stephen Smalley12b29f32008-05-07 13:03:20 -04001890 if (!rc) {
Eric Paris4b02b522010-11-23 11:40:08 -05001891 printk(KERN_INFO "SELinux: Context %s became valid (mapped).\n",
Stephen Smalley12b29f32008-05-07 13:03:20 -04001892 c->str);
1893 /* Replace string with mapped representation. */
1894 kfree(c->str);
1895 memcpy(c, &ctx, sizeof(*c));
1896 goto out;
1897 } else if (rc == -EINVAL) {
1898 /* Retain string representation for later mapping. */
1899 rc = 0;
1900 goto out;
1901 } else {
1902 /* Other error condition, e.g. ENOMEM. */
Eric Paris4b02b522010-11-23 11:40:08 -05001903 printk(KERN_ERR "SELinux: Unable to map context %s, rc = %d.\n",
Stephen Smalley12b29f32008-05-07 13:03:20 -04001904 c->str, -rc);
1905 goto out;
1906 }
1907 }
1908
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909 rc = context_cpy(&oldc, c);
1910 if (rc)
1911 goto out;
1912
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913 /* Convert the user. */
Eric Paris4b02b522010-11-23 11:40:08 -05001914 rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 usrdatum = hashtab_search(args->newp->p_users.table,
Eric Parisac76c052010-11-29 15:47:09 -05001916 sym_name(args->oldp, SYM_USERS, c->user - 1));
Eric Paris5d55a342008-04-18 17:38:33 -04001917 if (!usrdatum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919 c->user = usrdatum->value;
1920
1921 /* Convert the role. */
Eric Paris4b02b522010-11-23 11:40:08 -05001922 rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923 role = hashtab_search(args->newp->p_roles.table,
Eric Parisac76c052010-11-29 15:47:09 -05001924 sym_name(args->oldp, SYM_ROLES, c->role - 1));
Eric Paris5d55a342008-04-18 17:38:33 -04001925 if (!role)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927 c->role = role->value;
1928
1929 /* Convert the type. */
Eric Paris4b02b522010-11-23 11:40:08 -05001930 rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931 typdatum = hashtab_search(args->newp->p_types.table,
Eric Parisac76c052010-11-29 15:47:09 -05001932 sym_name(args->oldp, SYM_TYPES, c->type - 1));
Eric Paris5d55a342008-04-18 17:38:33 -04001933 if (!typdatum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935 c->type = typdatum->value;
1936
Guido Trentalancia0719aaf2010-02-03 16:40:20 +01001937 /* Convert the MLS fields if dealing with MLS policies */
1938 if (args->oldp->mls_enabled && args->newp->mls_enabled) {
1939 rc = mls_convert_context(args->oldp, args->newp, c);
1940 if (rc)
1941 goto bad;
1942 } else if (args->oldp->mls_enabled && !args->newp->mls_enabled) {
1943 /*
1944 * Switching between MLS and non-MLS policy:
1945 * free any storage used by the MLS fields in the
1946 * context for all existing entries in the sidtab.
1947 */
1948 mls_context_destroy(c);
1949 } else if (!args->oldp->mls_enabled && args->newp->mls_enabled) {
1950 /*
1951 * Switching between non-MLS and MLS policy:
1952 * ensure that the MLS fields of the context for all
1953 * existing entries in the sidtab are filled in with a
1954 * suitable default value, likely taken from one of the
1955 * initial SIDs.
1956 */
1957 oc = args->newp->ocontexts[OCON_ISID];
1958 while (oc && oc->sid[0] != SECINITSID_UNLABELED)
1959 oc = oc->next;
Eric Paris4b02b522010-11-23 11:40:08 -05001960 rc = -EINVAL;
Guido Trentalancia0719aaf2010-02-03 16:40:20 +01001961 if (!oc) {
1962 printk(KERN_ERR "SELinux: unable to look up"
1963 " the initial SIDs list\n");
1964 goto bad;
1965 }
1966 range = &oc->context[0].range;
1967 rc = mls_range_set(c, range);
1968 if (rc)
1969 goto bad;
1970 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001971
1972 /* Check the validity of the new context. */
1973 if (!policydb_context_isvalid(args->newp, c)) {
1974 rc = convert_context_handle_invalid_context(&oldc);
1975 if (rc)
1976 goto bad;
1977 }
1978
1979 context_destroy(&oldc);
Eric Paris4b02b522010-11-23 11:40:08 -05001980
Stephen Smalley12b29f32008-05-07 13:03:20 -04001981 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982out:
1983 return rc;
1984bad:
Stephen Smalley12b29f32008-05-07 13:03:20 -04001985 /* Map old representation to string and save it. */
Eric Paris4b02b522010-11-23 11:40:08 -05001986 rc = context_struct_to_string(&oldc, &s, &len);
1987 if (rc)
1988 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989 context_destroy(&oldc);
Stephen Smalley12b29f32008-05-07 13:03:20 -04001990 context_destroy(c);
1991 c->str = s;
1992 c->len = len;
Eric Paris4b02b522010-11-23 11:40:08 -05001993 printk(KERN_INFO "SELinux: Context %s became invalid (unmapped).\n",
Stephen Smalley12b29f32008-05-07 13:03:20 -04001994 c->str);
1995 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001996 goto out;
1997}
1998
Paul Moore3bb56b22008-01-29 08:38:19 -05001999static void security_load_policycaps(void)
2000{
Stephen Smalley4dc2fce2017-05-18 16:58:31 -04002001 unsigned int i;
2002 struct ebitmap_node *node;
2003
Paul Moore3bb56b22008-01-29 08:38:19 -05002004 selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps,
2005 POLICYDB_CAPABILITY_NETPEER);
Eric Parisb0c636b2008-02-28 12:58:40 -05002006 selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps,
2007 POLICYDB_CAPABILITY_OPENPERM);
Stephen Smalleyda69a532017-01-09 10:07:30 -05002008 selinux_policycap_extsockclass = ebitmap_get_bit(&policydb.policycaps,
2009 POLICYDB_CAPABILITY_EXTSOCKCLASS);
Chris PeBenito2be4d742013-05-03 09:05:39 -04002010 selinux_policycap_alwaysnetwork = ebitmap_get_bit(&policydb.policycaps,
2011 POLICYDB_CAPABILITY_ALWAYSNETWORK);
Stephen Smalley2651225b2017-02-28 10:35:56 -05002012 selinux_policycap_cgroupseclabel =
2013 ebitmap_get_bit(&policydb.policycaps,
2014 POLICYDB_CAPABILITY_CGROUPSECLABEL);
Stephen Smalleyaf63f412017-07-31 10:12:46 -04002015 selinux_policycap_nnp_nosuid_transition =
2016 ebitmap_get_bit(&policydb.policycaps,
2017 POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION);
Stephen Smalley4dc2fce2017-05-18 16:58:31 -04002018
2019 for (i = 0; i < ARRAY_SIZE(selinux_policycap_names); i++)
2020 pr_info("SELinux: policy capability %s=%d\n",
2021 selinux_policycap_names[i],
2022 ebitmap_get_bit(&policydb.policycaps, i));
2023
2024 ebitmap_for_each_positive_bit(&policydb.policycaps, node, i) {
2025 if (i >= ARRAY_SIZE(selinux_policycap_names))
2026 pr_info("SELinux: unknown policy capability %u\n",
2027 i);
2028 }
Paul Moore3bb56b22008-01-29 08:38:19 -05002029}
2030
Stephen Smalleye900a7d2007-04-19 14:16:19 -04002031static int security_preserve_bools(struct policydb *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032
2033/**
2034 * security_load_policy - Load a security policy configuration.
2035 * @data: binary policy data
2036 * @len: length of data in bytes
2037 *
2038 * Load a new set of security policy configuration data,
2039 * validate it and convert the SID table as necessary.
2040 * This function will flush the access vector cache after
2041 * loading the new policy.
2042 */
2043int security_load_policy(void *data, size_t len)
2044{
Tim Gardnerb5495b42013-11-14 15:04:51 -07002045 struct policydb *oldpolicydb, *newpolicydb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002046 struct sidtab oldsidtab, newsidtab;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04002047 struct selinux_mapping *oldmap, *map = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002048 struct convert_context_args args;
2049 u32 seqno;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04002050 u16 map_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051 int rc = 0;
2052 struct policy_file file = { data, len }, *fp = &file;
2053
Tim Gardnerb5495b42013-11-14 15:04:51 -07002054 oldpolicydb = kzalloc(2 * sizeof(*oldpolicydb), GFP_KERNEL);
2055 if (!oldpolicydb) {
2056 rc = -ENOMEM;
2057 goto out;
2058 }
2059 newpolicydb = oldpolicydb + 1;
2060
Linus Torvalds1da177e2005-04-16 15:20:36 -07002061 if (!ss_initialized) {
2062 avtab_cache_init();
Junil Leeb4958c82017-06-08 13:18:09 +09002063 ebitmap_cache_init();
Eric Parisa2000052010-04-20 10:29:42 -04002064 rc = policydb_read(&policydb, fp);
2065 if (rc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066 avtab_cache_destroy();
Junil Leeb4958c82017-06-08 13:18:09 +09002067 ebitmap_cache_destroy();
Tim Gardnerb5495b42013-11-14 15:04:51 -07002068 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002069 }
Eric Parisa2000052010-04-20 10:29:42 -04002070
Eric Pariscee74f42010-10-13 17:50:25 -04002071 policydb.len = len;
Eric Parisa2000052010-04-20 10:29:42 -04002072 rc = selinux_set_mapping(&policydb, secclass_map,
2073 &current_mapping,
2074 &current_mapping_size);
2075 if (rc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002076 policydb_destroy(&policydb);
2077 avtab_cache_destroy();
Junil Leeb4958c82017-06-08 13:18:09 +09002078 ebitmap_cache_destroy();
Tim Gardnerb5495b42013-11-14 15:04:51 -07002079 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002080 }
Eric Parisa2000052010-04-20 10:29:42 -04002081
2082 rc = policydb_load_isids(&policydb, &sidtab);
2083 if (rc) {
Chad Sellersb94c7e62006-11-06 12:38:18 -05002084 policydb_destroy(&policydb);
2085 avtab_cache_destroy();
Junil Leeb4958c82017-06-08 13:18:09 +09002086 ebitmap_cache_destroy();
Tim Gardnerb5495b42013-11-14 15:04:51 -07002087 goto out;
Chad Sellersb94c7e62006-11-06 12:38:18 -05002088 }
Eric Parisa2000052010-04-20 10:29:42 -04002089
Paul Moore3bb56b22008-01-29 08:38:19 -05002090 security_load_policycaps();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002091 ss_initialized = 1;
Stephen Smalley4c443d12005-05-16 21:53:52 -07002092 seqno = ++latest_granting;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002093 selinux_complete_init();
Stephen Smalley4c443d12005-05-16 21:53:52 -07002094 avc_ss_reset(seqno);
2095 selnl_notify_policyload(seqno);
KaiGai Kohei11904162010-09-14 18:28:39 +09002096 selinux_status_update_policyload(seqno);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07002097 selinux_netlbl_cache_invalidate();
Venkat Yekkirala342a0cf2007-01-26 19:03:48 -08002098 selinux_xfrm_notify_policyload();
Tim Gardnerb5495b42013-11-14 15:04:51 -07002099 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002100 }
2101
2102#if 0
2103 sidtab_hash_eval(&sidtab, "sids");
2104#endif
2105
Tim Gardnerb5495b42013-11-14 15:04:51 -07002106 rc = policydb_read(newpolicydb, fp);
Eric Parisa2000052010-04-20 10:29:42 -04002107 if (rc)
Tim Gardnerb5495b42013-11-14 15:04:51 -07002108 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002109
Tim Gardnerb5495b42013-11-14 15:04:51 -07002110 newpolicydb->len = len;
Guido Trentalancia0719aaf2010-02-03 16:40:20 +01002111 /* If switching between different policy types, log MLS status */
Tim Gardnerb5495b42013-11-14 15:04:51 -07002112 if (policydb.mls_enabled && !newpolicydb->mls_enabled)
Guido Trentalancia0719aaf2010-02-03 16:40:20 +01002113 printk(KERN_INFO "SELinux: Disabling MLS support...\n");
Tim Gardnerb5495b42013-11-14 15:04:51 -07002114 else if (!policydb.mls_enabled && newpolicydb->mls_enabled)
Guido Trentalancia0719aaf2010-02-03 16:40:20 +01002115 printk(KERN_INFO "SELinux: Enabling MLS support...\n");
2116
Tim Gardnerb5495b42013-11-14 15:04:51 -07002117 rc = policydb_load_isids(newpolicydb, &newsidtab);
Guido Trentalancia42596ea2010-02-03 17:06:01 +01002118 if (rc) {
2119 printk(KERN_ERR "SELinux: unable to load the initial SIDs\n");
Tim Gardnerb5495b42013-11-14 15:04:51 -07002120 policydb_destroy(newpolicydb);
2121 goto out;
Stephen Smalley12b29f32008-05-07 13:03:20 -04002122 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002123
Tim Gardnerb5495b42013-11-14 15:04:51 -07002124 rc = selinux_set_mapping(newpolicydb, secclass_map, &map, &map_size);
Eric Parisa2000052010-04-20 10:29:42 -04002125 if (rc)
Chad Sellersb94c7e62006-11-06 12:38:18 -05002126 goto err;
Chad Sellersb94c7e62006-11-06 12:38:18 -05002127
Tim Gardnerb5495b42013-11-14 15:04:51 -07002128 rc = security_preserve_bools(newpolicydb);
Stephen Smalleye900a7d2007-04-19 14:16:19 -04002129 if (rc) {
James Morris454d9722008-02-26 20:42:02 +11002130 printk(KERN_ERR "SELinux: unable to preserve booleans\n");
Stephen Smalleye900a7d2007-04-19 14:16:19 -04002131 goto err;
2132 }
2133
Linus Torvalds1da177e2005-04-16 15:20:36 -07002134 /* Clone the SID table. */
2135 sidtab_shutdown(&sidtab);
Eric Parisa2000052010-04-20 10:29:42 -04002136
2137 rc = sidtab_map(&sidtab, clone_sid, &newsidtab);
2138 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002139 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002140
Stephen Smalley12b29f32008-05-07 13:03:20 -04002141 /*
2142 * Convert the internal representations of contexts
2143 * in the new SID table.
2144 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145 args.oldp = &policydb;
Tim Gardnerb5495b42013-11-14 15:04:51 -07002146 args.newp = newpolicydb;
Stephen Smalley12b29f32008-05-07 13:03:20 -04002147 rc = sidtab_map(&newsidtab, convert_context, &args);
Guido Trentalancia0719aaf2010-02-03 16:40:20 +01002148 if (rc) {
2149 printk(KERN_ERR "SELinux: unable to convert the internal"
2150 " representation of contexts in the new SID"
2151 " table\n");
Stephen Smalley12b29f32008-05-07 13:03:20 -04002152 goto err;
Guido Trentalancia0719aaf2010-02-03 16:40:20 +01002153 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002154
2155 /* Save the old policydb and SID table to free later. */
Tim Gardnerb5495b42013-11-14 15:04:51 -07002156 memcpy(oldpolicydb, &policydb, sizeof(policydb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002157 sidtab_set(&oldsidtab, &sidtab);
2158
2159 /* Install the new policydb and SID table. */
James Morris0804d112008-06-06 18:40:29 +10002160 write_lock_irq(&policy_rwlock);
Tim Gardnerb5495b42013-11-14 15:04:51 -07002161 memcpy(&policydb, newpolicydb, sizeof(policydb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002162 sidtab_set(&sidtab, &newsidtab);
Paul Moore3bb56b22008-01-29 08:38:19 -05002163 security_load_policycaps();
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04002164 oldmap = current_mapping;
2165 current_mapping = map;
2166 current_mapping_size = map_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002167 seqno = ++latest_granting;
James Morris0804d112008-06-06 18:40:29 +10002168 write_unlock_irq(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002169
2170 /* Free the old policydb and SID table. */
Tim Gardnerb5495b42013-11-14 15:04:51 -07002171 policydb_destroy(oldpolicydb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002172 sidtab_destroy(&oldsidtab);
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04002173 kfree(oldmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002174
2175 avc_ss_reset(seqno);
2176 selnl_notify_policyload(seqno);
KaiGai Kohei11904162010-09-14 18:28:39 +09002177 selinux_status_update_policyload(seqno);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07002178 selinux_netlbl_cache_invalidate();
Venkat Yekkirala342a0cf2007-01-26 19:03:48 -08002179 selinux_xfrm_notify_policyload();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002180
Tim Gardnerb5495b42013-11-14 15:04:51 -07002181 rc = 0;
2182 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002183
2184err:
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04002185 kfree(map);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002186 sidtab_destroy(&newsidtab);
Tim Gardnerb5495b42013-11-14 15:04:51 -07002187 policydb_destroy(newpolicydb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002188
Tim Gardnerb5495b42013-11-14 15:04:51 -07002189out:
2190 kfree(oldpolicydb);
2191 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002192}
2193
Eric Pariscee74f42010-10-13 17:50:25 -04002194size_t security_policydb_len(void)
2195{
2196 size_t len;
2197
2198 read_lock(&policy_rwlock);
2199 len = policydb.len;
2200 read_unlock(&policy_rwlock);
2201
2202 return len;
2203}
2204
Linus Torvalds1da177e2005-04-16 15:20:36 -07002205/**
2206 * security_port_sid - Obtain the SID for a port.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002207 * @protocol: protocol number
2208 * @port: port number
2209 * @out_sid: security identifier
2210 */
Paul Moore3e112172008-04-10 10:48:14 -04002211int security_port_sid(u8 protocol, u16 port, u32 *out_sid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002212{
2213 struct ocontext *c;
2214 int rc = 0;
2215
James Morris0804d112008-06-06 18:40:29 +10002216 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002217
2218 c = policydb.ocontexts[OCON_PORT];
2219 while (c) {
2220 if (c->u.port.protocol == protocol &&
2221 c->u.port.low_port <= port &&
2222 c->u.port.high_port >= port)
2223 break;
2224 c = c->next;
2225 }
2226
2227 if (c) {
2228 if (!c->sid[0]) {
2229 rc = sidtab_context_to_sid(&sidtab,
2230 &c->context[0],
2231 &c->sid[0]);
2232 if (rc)
2233 goto out;
2234 }
2235 *out_sid = c->sid[0];
2236 } else {
2237 *out_sid = SECINITSID_PORT;
2238 }
2239
2240out:
James Morris0804d112008-06-06 18:40:29 +10002241 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242 return rc;
2243}
2244
2245/**
Daniel Jurgenscfc4d882017-05-19 15:48:57 +03002246 * security_pkey_sid - Obtain the SID for a pkey.
2247 * @subnet_prefix: Subnet Prefix
2248 * @pkey_num: pkey number
2249 * @out_sid: security identifier
2250 */
2251int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid)
2252{
2253 struct ocontext *c;
2254 int rc = 0;
2255
2256 read_lock(&policy_rwlock);
2257
2258 c = policydb.ocontexts[OCON_IBPKEY];
2259 while (c) {
2260 if (c->u.ibpkey.low_pkey <= pkey_num &&
2261 c->u.ibpkey.high_pkey >= pkey_num &&
2262 c->u.ibpkey.subnet_prefix == subnet_prefix)
2263 break;
2264
2265 c = c->next;
2266 }
2267
2268 if (c) {
2269 if (!c->sid[0]) {
2270 rc = sidtab_context_to_sid(&sidtab,
2271 &c->context[0],
2272 &c->sid[0]);
2273 if (rc)
2274 goto out;
2275 }
2276 *out_sid = c->sid[0];
2277 } else
2278 *out_sid = SECINITSID_UNLABELED;
2279
2280out:
2281 read_unlock(&policy_rwlock);
2282 return rc;
2283}
2284
2285/**
Daniel Jurgensab861df2017-05-19 15:48:58 +03002286 * security_ib_endport_sid - Obtain the SID for a subnet management interface.
2287 * @dev_name: device name
2288 * @port: port number
2289 * @out_sid: security identifier
2290 */
2291int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid)
2292{
2293 struct ocontext *c;
2294 int rc = 0;
2295
2296 read_lock(&policy_rwlock);
2297
2298 c = policydb.ocontexts[OCON_IBENDPORT];
2299 while (c) {
2300 if (c->u.ibendport.port == port_num &&
2301 !strncmp(c->u.ibendport.dev_name,
2302 dev_name,
2303 IB_DEVICE_NAME_MAX))
2304 break;
2305
2306 c = c->next;
2307 }
2308
2309 if (c) {
2310 if (!c->sid[0]) {
2311 rc = sidtab_context_to_sid(&sidtab,
2312 &c->context[0],
2313 &c->sid[0]);
2314 if (rc)
2315 goto out;
2316 }
2317 *out_sid = c->sid[0];
2318 } else
2319 *out_sid = SECINITSID_UNLABELED;
2320
2321out:
2322 read_unlock(&policy_rwlock);
2323 return rc;
2324}
2325
2326/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002327 * security_netif_sid - Obtain the SID for a network interface.
2328 * @name: interface name
2329 * @if_sid: interface SID
Linus Torvalds1da177e2005-04-16 15:20:36 -07002330 */
Paul Mooree8bfdb92008-01-29 08:38:08 -05002331int security_netif_sid(char *name, u32 *if_sid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002332{
2333 int rc = 0;
2334 struct ocontext *c;
2335
James Morris0804d112008-06-06 18:40:29 +10002336 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002337
2338 c = policydb.ocontexts[OCON_NETIF];
2339 while (c) {
2340 if (strcmp(name, c->u.name) == 0)
2341 break;
2342 c = c->next;
2343 }
2344
2345 if (c) {
2346 if (!c->sid[0] || !c->sid[1]) {
2347 rc = sidtab_context_to_sid(&sidtab,
2348 &c->context[0],
2349 &c->sid[0]);
2350 if (rc)
2351 goto out;
2352 rc = sidtab_context_to_sid(&sidtab,
2353 &c->context[1],
2354 &c->sid[1]);
2355 if (rc)
2356 goto out;
2357 }
2358 *if_sid = c->sid[0];
Paul Mooree8bfdb92008-01-29 08:38:08 -05002359 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002360 *if_sid = SECINITSID_NETIF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002361
2362out:
James Morris0804d112008-06-06 18:40:29 +10002363 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002364 return rc;
2365}
2366
2367static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask)
2368{
2369 int i, fail = 0;
2370
Eric Paris5d55a342008-04-18 17:38:33 -04002371 for (i = 0; i < 4; i++)
2372 if (addr[i] != (input[i] & mask[i])) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002373 fail = 1;
2374 break;
2375 }
2376
2377 return !fail;
2378}
2379
2380/**
2381 * security_node_sid - Obtain the SID for a node (host).
2382 * @domain: communication domain aka address family
2383 * @addrp: address
2384 * @addrlen: address length in bytes
2385 * @out_sid: security identifier
2386 */
2387int security_node_sid(u16 domain,
2388 void *addrp,
2389 u32 addrlen,
2390 u32 *out_sid)
2391{
Eric Paris4b02b522010-11-23 11:40:08 -05002392 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002393 struct ocontext *c;
2394
James Morris0804d112008-06-06 18:40:29 +10002395 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002396
2397 switch (domain) {
2398 case AF_INET: {
2399 u32 addr;
2400
Eric Paris4b02b522010-11-23 11:40:08 -05002401 rc = -EINVAL;
2402 if (addrlen != sizeof(u32))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002403 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002404
2405 addr = *((u32 *)addrp);
2406
2407 c = policydb.ocontexts[OCON_NODE];
2408 while (c) {
2409 if (c->u.node.addr == (addr & c->u.node.mask))
2410 break;
2411 c = c->next;
2412 }
2413 break;
2414 }
2415
2416 case AF_INET6:
Eric Paris4b02b522010-11-23 11:40:08 -05002417 rc = -EINVAL;
2418 if (addrlen != sizeof(u64) * 2)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002420 c = policydb.ocontexts[OCON_NODE6];
2421 while (c) {
2422 if (match_ipv6_addrmask(addrp, c->u.node6.addr,
2423 c->u.node6.mask))
2424 break;
2425 c = c->next;
2426 }
2427 break;
2428
2429 default:
Eric Paris4b02b522010-11-23 11:40:08 -05002430 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002431 *out_sid = SECINITSID_NODE;
2432 goto out;
2433 }
2434
2435 if (c) {
2436 if (!c->sid[0]) {
2437 rc = sidtab_context_to_sid(&sidtab,
2438 &c->context[0],
2439 &c->sid[0]);
2440 if (rc)
2441 goto out;
2442 }
2443 *out_sid = c->sid[0];
2444 } else {
2445 *out_sid = SECINITSID_NODE;
2446 }
2447
Eric Paris4b02b522010-11-23 11:40:08 -05002448 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002449out:
James Morris0804d112008-06-06 18:40:29 +10002450 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002451 return rc;
2452}
2453
2454#define SIDS_NEL 25
2455
2456/**
2457 * security_get_user_sids - Obtain reachable SIDs for a user.
2458 * @fromsid: starting SID
2459 * @username: username
2460 * @sids: array of reachable SIDs for user
2461 * @nel: number of elements in @sids
2462 *
2463 * Generate the set of SIDs for legal security contexts
2464 * for a given user that can be reached by @fromsid.
2465 * Set *@sids to point to a dynamically allocated
2466 * array containing the set of SIDs. Set *@nel to the
2467 * number of elements in the array.
2468 */
2469
2470int security_get_user_sids(u32 fromsid,
Eric Paris5d55a342008-04-18 17:38:33 -04002471 char *username,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002472 u32 **sids,
2473 u32 *nel)
2474{
2475 struct context *fromcon, usercon;
Stephen Smalley2c3c05d2007-06-07 15:34:10 -04002476 u32 *mysids = NULL, *mysids2, sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002477 u32 mynel = 0, maxnel = SIDS_NEL;
2478 struct user_datum *user;
2479 struct role_datum *role;
Stephen Smalley782ebb92005-09-03 15:55:16 -07002480 struct ebitmap_node *rnode, *tnode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002481 int rc = 0, i, j;
2482
Stephen Smalley2c3c05d2007-06-07 15:34:10 -04002483 *sids = NULL;
2484 *nel = 0;
2485
2486 if (!ss_initialized)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002487 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002488
James Morris0804d112008-06-06 18:40:29 +10002489 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002490
Stephen Smalley12b29f32008-05-07 13:03:20 -04002491 context_init(&usercon);
2492
Eric Paris4b02b522010-11-23 11:40:08 -05002493 rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002494 fromcon = sidtab_search(&sidtab, fromsid);
Eric Paris4b02b522010-11-23 11:40:08 -05002495 if (!fromcon)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002496 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002497
Eric Paris4b02b522010-11-23 11:40:08 -05002498 rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002499 user = hashtab_search(policydb.p_users.table, username);
Eric Paris4b02b522010-11-23 11:40:08 -05002500 if (!user)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002501 goto out_unlock;
Eric Paris4b02b522010-11-23 11:40:08 -05002502
Linus Torvalds1da177e2005-04-16 15:20:36 -07002503 usercon.user = user->value;
2504
Eric Paris4b02b522010-11-23 11:40:08 -05002505 rc = -ENOMEM;
James Morris89d155e2005-10-30 14:59:21 -08002506 mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC);
Eric Paris4b02b522010-11-23 11:40:08 -05002507 if (!mysids)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002508 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002509
KaiGai Kohei9fe79ad2007-09-29 02:20:55 +09002510 ebitmap_for_each_positive_bit(&user->roles, rnode, i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002511 role = policydb.role_val_to_struct[i];
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08002512 usercon.role = i + 1;
KaiGai Kohei9fe79ad2007-09-29 02:20:55 +09002513 ebitmap_for_each_positive_bit(&role->types, tnode, j) {
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08002514 usercon.type = j + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002515
2516 if (mls_setup_user_range(fromcon, user, &usercon))
2517 continue;
2518
Linus Torvalds1da177e2005-04-16 15:20:36 -07002519 rc = sidtab_context_to_sid(&sidtab, &usercon, &sid);
Stephen Smalley2c3c05d2007-06-07 15:34:10 -04002520 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002521 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002522 if (mynel < maxnel) {
2523 mysids[mynel++] = sid;
2524 } else {
Eric Paris4b02b522010-11-23 11:40:08 -05002525 rc = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002526 maxnel += SIDS_NEL;
James Morris89d155e2005-10-30 14:59:21 -08002527 mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC);
Eric Paris4b02b522010-11-23 11:40:08 -05002528 if (!mysids2)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002529 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002530 memcpy(mysids2, mysids, mynel * sizeof(*mysids2));
2531 kfree(mysids);
2532 mysids = mysids2;
2533 mysids[mynel++] = sid;
2534 }
2535 }
2536 }
Eric Paris4b02b522010-11-23 11:40:08 -05002537 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002538out_unlock:
James Morris0804d112008-06-06 18:40:29 +10002539 read_unlock(&policy_rwlock);
Stephen Smalley2c3c05d2007-06-07 15:34:10 -04002540 if (rc || !mynel) {
2541 kfree(mysids);
2542 goto out;
2543 }
2544
Eric Paris4b02b522010-11-23 11:40:08 -05002545 rc = -ENOMEM;
Stephen Smalley2c3c05d2007-06-07 15:34:10 -04002546 mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL);
2547 if (!mysids2) {
Stephen Smalley2c3c05d2007-06-07 15:34:10 -04002548 kfree(mysids);
2549 goto out;
2550 }
2551 for (i = 0, j = 0; i < mynel; i++) {
Linus Torvaldsf01e1af2011-05-24 13:48:51 -07002552 struct av_decision dummy_avd;
Stephen Smalley2c3c05d2007-06-07 15:34:10 -04002553 rc = avc_has_perm_noaudit(fromsid, mysids[i],
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04002554 SECCLASS_PROCESS, /* kernel value */
Stephen Smalley2c3c05d2007-06-07 15:34:10 -04002555 PROCESS__TRANSITION, AVC_STRICT,
Linus Torvaldsf01e1af2011-05-24 13:48:51 -07002556 &dummy_avd);
Stephen Smalley2c3c05d2007-06-07 15:34:10 -04002557 if (!rc)
2558 mysids2[j++] = mysids[i];
2559 cond_resched();
2560 }
2561 rc = 0;
2562 kfree(mysids);
2563 *sids = mysids2;
2564 *nel = j;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002565out:
2566 return rc;
2567}
2568
2569/**
Waiman Longf31e7992014-06-23 11:28:51 -04002570 * __security_genfs_sid - Helper to obtain a SID for a file in a filesystem
Linus Torvalds1da177e2005-04-16 15:20:36 -07002571 * @fstype: filesystem type
2572 * @path: path from root of mount
2573 * @sclass: file security class
2574 * @sid: SID for path
2575 *
2576 * Obtain a SID to use for a file in a filesystem that
2577 * cannot support xattr or use a fixed labeling behavior like
2578 * transition SIDs or task SIDs.
Waiman Longf31e7992014-06-23 11:28:51 -04002579 *
2580 * The caller must acquire the policy_rwlock before calling this function.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002581 */
Waiman Longf31e7992014-06-23 11:28:51 -04002582static inline int __security_genfs_sid(const char *fstype,
2583 char *path,
2584 u16 orig_sclass,
2585 u32 *sid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002586{
2587 int len;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04002588 u16 sclass;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002589 struct genfs *genfs;
2590 struct ocontext *c;
Eric Paris4b02b522010-11-23 11:40:08 -05002591 int rc, cmp = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002592
Stephen Smalleyb1aa5302008-01-25 13:03:42 -05002593 while (path[0] == '/' && path[1] == '/')
2594 path++;
2595
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04002596 sclass = unmap_class(orig_sclass);
Eric Paris4b02b522010-11-23 11:40:08 -05002597 *sid = SECINITSID_UNLABELED;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04002598
Linus Torvalds1da177e2005-04-16 15:20:36 -07002599 for (genfs = policydb.genfs; genfs; genfs = genfs->next) {
2600 cmp = strcmp(fstype, genfs->fstype);
2601 if (cmp <= 0)
2602 break;
2603 }
2604
Eric Paris4b02b522010-11-23 11:40:08 -05002605 rc = -ENOENT;
2606 if (!genfs || cmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002607 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002608
2609 for (c = genfs->head; c; c = c->next) {
2610 len = strlen(c->u.name);
2611 if ((!c->v.sclass || sclass == c->v.sclass) &&
2612 (strncmp(c->u.name, path, len) == 0))
2613 break;
2614 }
2615
Eric Paris4b02b522010-11-23 11:40:08 -05002616 rc = -ENOENT;
2617 if (!c)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002618 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002619
2620 if (!c->sid[0]) {
Eric Paris4b02b522010-11-23 11:40:08 -05002621 rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002622 if (rc)
2623 goto out;
2624 }
2625
2626 *sid = c->sid[0];
Eric Paris4b02b522010-11-23 11:40:08 -05002627 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002628out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002629 return rc;
2630}
2631
2632/**
Waiman Longf31e7992014-06-23 11:28:51 -04002633 * security_genfs_sid - Obtain a SID for a file in a filesystem
2634 * @fstype: filesystem type
2635 * @path: path from root of mount
2636 * @sclass: file security class
2637 * @sid: SID for path
2638 *
2639 * Acquire policy_rwlock before calling __security_genfs_sid() and release
2640 * it afterward.
2641 */
2642int security_genfs_sid(const char *fstype,
2643 char *path,
2644 u16 orig_sclass,
2645 u32 *sid)
2646{
2647 int retval;
2648
2649 read_lock(&policy_rwlock);
2650 retval = __security_genfs_sid(fstype, path, orig_sclass, sid);
2651 read_unlock(&policy_rwlock);
2652 return retval;
2653}
2654
2655/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002656 * security_fs_use - Determine how to handle labeling for a filesystem.
Eric Parisa64c54c2012-08-24 15:59:07 -04002657 * @sb: superblock in question
Linus Torvalds1da177e2005-04-16 15:20:36 -07002658 */
Eric Parisa64c54c2012-08-24 15:59:07 -04002659int security_fs_use(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002660{
2661 int rc = 0;
2662 struct ocontext *c;
Eric Parisa64c54c2012-08-24 15:59:07 -04002663 struct superblock_security_struct *sbsec = sb->s_security;
2664 const char *fstype = sb->s_type->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002665
James Morris0804d112008-06-06 18:40:29 +10002666 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002667
Paul Moore4d546f82013-12-13 14:49:53 -05002668 c = policydb.ocontexts[OCON_FSUSE];
2669 while (c) {
2670 if (strcmp(fstype, c->u.name) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002671 break;
Paul Moore4d546f82013-12-13 14:49:53 -05002672 c = c->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002673 }
2674
2675 if (c) {
Eric Parisa64c54c2012-08-24 15:59:07 -04002676 sbsec->behavior = c->v.behavior;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002677 if (!c->sid[0]) {
Eric Paris4b02b522010-11-23 11:40:08 -05002678 rc = sidtab_context_to_sid(&sidtab, &c->context[0],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002679 &c->sid[0]);
2680 if (rc)
2681 goto out;
2682 }
Eric Parisa64c54c2012-08-24 15:59:07 -04002683 sbsec->sid = c->sid[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002684 } else {
Waiman Longf31e7992014-06-23 11:28:51 -04002685 rc = __security_genfs_sid(fstype, "/", SECCLASS_DIR,
2686 &sbsec->sid);
James Morris089be432008-07-15 18:32:49 +10002687 if (rc) {
Eric Parisa64c54c2012-08-24 15:59:07 -04002688 sbsec->behavior = SECURITY_FS_USE_NONE;
James Morris089be432008-07-15 18:32:49 +10002689 rc = 0;
2690 } else {
Eric Parisa64c54c2012-08-24 15:59:07 -04002691 sbsec->behavior = SECURITY_FS_USE_GENFS;
James Morris089be432008-07-15 18:32:49 +10002692 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002693 }
2694
2695out:
James Morris0804d112008-06-06 18:40:29 +10002696 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002697 return rc;
2698}
2699
2700int security_get_bools(int *len, char ***names, int **values)
2701{
Eric Paris4b02b522010-11-23 11:40:08 -05002702 int i, rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002703
James Morris0804d112008-06-06 18:40:29 +10002704 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002705 *names = NULL;
2706 *values = NULL;
2707
Eric Paris4b02b522010-11-23 11:40:08 -05002708 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002709 *len = policydb.p_bools.nprim;
Eric Paris4b02b522010-11-23 11:40:08 -05002710 if (!*len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002711 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002712
Eric Paris4b02b522010-11-23 11:40:08 -05002713 rc = -ENOMEM;
2714 *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002715 if (!*names)
2716 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002717
Eric Paris4b02b522010-11-23 11:40:08 -05002718 rc = -ENOMEM;
2719 *values = kcalloc(*len, sizeof(int), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002720 if (!*values)
2721 goto err;
2722
2723 for (i = 0; i < *len; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002724 (*values)[i] = policydb.bool_val_to_struct[i]->state;
Eric Paris4b02b522010-11-23 11:40:08 -05002725
2726 rc = -ENOMEM;
Rasmus Villemoes21b76f12015-10-21 17:44:26 -04002727 (*names)[i] = kstrdup(sym_name(&policydb, SYM_BOOLS, i), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002728 if (!(*names)[i])
2729 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002730 }
2731 rc = 0;
2732out:
James Morris0804d112008-06-06 18:40:29 +10002733 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002734 return rc;
2735err:
2736 if (*names) {
2737 for (i = 0; i < *len; i++)
Jesper Juhl9a5f04b2005-06-25 14:58:51 -07002738 kfree((*names)[i]);
Tom Rix808db35a2020-06-10 14:57:13 -07002739 kfree(*names);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002740 }
Jesper Juhl9a5f04b2005-06-25 14:58:51 -07002741 kfree(*values);
Tom Rix808db35a2020-06-10 14:57:13 -07002742 *len = 0;
2743 *names = NULL;
2744 *values = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002745 goto out;
2746}
2747
2748
2749int security_set_bools(int len, int *values)
2750{
Eric Paris4b02b522010-11-23 11:40:08 -05002751 int i, rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002752 int lenp, seqno = 0;
2753 struct cond_node *cur;
2754
James Morris0804d112008-06-06 18:40:29 +10002755 write_lock_irq(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002756
Eric Paris4b02b522010-11-23 11:40:08 -05002757 rc = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002758 lenp = policydb.p_bools.nprim;
Eric Paris4b02b522010-11-23 11:40:08 -05002759 if (len != lenp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002760 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002761
Linus Torvalds1da177e2005-04-16 15:20:36 -07002762 for (i = 0; i < len; i++) {
Steve Grubbaf601e42006-01-04 14:08:39 +00002763 if (!!values[i] != policydb.bool_val_to_struct[i]->state) {
2764 audit_log(current->audit_context, GFP_ATOMIC,
2765 AUDIT_MAC_CONFIG_CHANGE,
Eric Paris4746ec52008-01-08 10:06:53 -05002766 "bool=%s val=%d old_val=%d auid=%u ses=%u",
Eric Parisac76c052010-11-29 15:47:09 -05002767 sym_name(&policydb, SYM_BOOLS, i),
Steve Grubbaf601e42006-01-04 14:08:39 +00002768 !!values[i],
2769 policydb.bool_val_to_struct[i]->state,
Eric W. Biederman581abc02012-08-20 00:09:36 -07002770 from_kuid(&init_user_ns, audit_get_loginuid(current)),
Eric Paris4746ec52008-01-08 10:06:53 -05002771 audit_get_sessionid(current));
Steve Grubbaf601e42006-01-04 14:08:39 +00002772 }
Eric Paris5d55a342008-04-18 17:38:33 -04002773 if (values[i])
Linus Torvalds1da177e2005-04-16 15:20:36 -07002774 policydb.bool_val_to_struct[i]->state = 1;
Eric Paris5d55a342008-04-18 17:38:33 -04002775 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002776 policydb.bool_val_to_struct[i]->state = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002777 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002778
Vesa-Matti Karidbc74c62008-08-07 03:18:20 +03002779 for (cur = policydb.cond_list; cur; cur = cur->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002780 rc = evaluate_cond_node(&policydb, cur);
2781 if (rc)
2782 goto out;
2783 }
2784
2785 seqno = ++latest_granting;
Eric Paris4b02b522010-11-23 11:40:08 -05002786 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002787out:
James Morris0804d112008-06-06 18:40:29 +10002788 write_unlock_irq(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002789 if (!rc) {
2790 avc_ss_reset(seqno);
2791 selnl_notify_policyload(seqno);
KaiGai Kohei11904162010-09-14 18:28:39 +09002792 selinux_status_update_policyload(seqno);
Venkat Yekkirala342a0cf2007-01-26 19:03:48 -08002793 selinux_xfrm_notify_policyload();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002794 }
2795 return rc;
2796}
2797
Prarit Bhargava0fd71a62016-04-14 10:40:57 -04002798int security_get_bool_value(int index)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002799{
Eric Paris4b02b522010-11-23 11:40:08 -05002800 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002801 int len;
2802
James Morris0804d112008-06-06 18:40:29 +10002803 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002804
Eric Paris4b02b522010-11-23 11:40:08 -05002805 rc = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002806 len = policydb.p_bools.nprim;
Prarit Bhargava0fd71a62016-04-14 10:40:57 -04002807 if (index >= len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002808 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002809
Prarit Bhargava0fd71a62016-04-14 10:40:57 -04002810 rc = policydb.bool_val_to_struct[index]->state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002811out:
James Morris0804d112008-06-06 18:40:29 +10002812 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002813 return rc;
2814}
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002815
Stephen Smalleye900a7d2007-04-19 14:16:19 -04002816static int security_preserve_bools(struct policydb *p)
2817{
2818 int rc, nbools = 0, *bvalues = NULL, i;
2819 char **bnames = NULL;
2820 struct cond_bool_datum *booldatum;
2821 struct cond_node *cur;
2822
2823 rc = security_get_bools(&nbools, &bnames, &bvalues);
2824 if (rc)
2825 goto out;
2826 for (i = 0; i < nbools; i++) {
2827 booldatum = hashtab_search(p->p_bools.table, bnames[i]);
2828 if (booldatum)
2829 booldatum->state = bvalues[i];
2830 }
Vesa-Matti Karidbc74c62008-08-07 03:18:20 +03002831 for (cur = p->cond_list; cur; cur = cur->next) {
Stephen Smalleye900a7d2007-04-19 14:16:19 -04002832 rc = evaluate_cond_node(p, cur);
2833 if (rc)
2834 goto out;
2835 }
2836
2837out:
2838 if (bnames) {
2839 for (i = 0; i < nbools; i++)
2840 kfree(bnames[i]);
2841 }
2842 kfree(bnames);
2843 kfree(bvalues);
2844 return rc;
2845}
2846
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002847/*
2848 * security_sid_mls_copy() - computes a new sid based on the given
2849 * sid and the mls portion of mls_sid.
2850 */
2851int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid)
2852{
2853 struct context *context1;
2854 struct context *context2;
2855 struct context newcon;
2856 char *s;
2857 u32 len;
Eric Paris4b02b522010-11-23 11:40:08 -05002858 int rc;
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002859
Eric Paris4b02b522010-11-23 11:40:08 -05002860 rc = 0;
Guido Trentalancia0719aaf2010-02-03 16:40:20 +01002861 if (!ss_initialized || !policydb.mls_enabled) {
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002862 *new_sid = sid;
2863 goto out;
2864 }
2865
2866 context_init(&newcon);
2867
James Morris0804d112008-06-06 18:40:29 +10002868 read_lock(&policy_rwlock);
Eric Paris4b02b522010-11-23 11:40:08 -05002869
2870 rc = -EINVAL;
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002871 context1 = sidtab_search(&sidtab, sid);
2872 if (!context1) {
Eric Paris744ba352008-04-17 11:52:44 -04002873 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
2874 __func__, sid);
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002875 goto out_unlock;
2876 }
2877
Eric Paris4b02b522010-11-23 11:40:08 -05002878 rc = -EINVAL;
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002879 context2 = sidtab_search(&sidtab, mls_sid);
2880 if (!context2) {
Eric Paris744ba352008-04-17 11:52:44 -04002881 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
2882 __func__, mls_sid);
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002883 goto out_unlock;
2884 }
2885
2886 newcon.user = context1->user;
2887 newcon.role = context1->role;
2888 newcon.type = context1->type;
Venkat Yekkirala0efc61e2006-12-12 13:02:41 -06002889 rc = mls_context_cpy(&newcon, context2);
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002890 if (rc)
2891 goto out_unlock;
2892
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002893 /* Check the validity of the new context. */
2894 if (!policydb_context_isvalid(&policydb, &newcon)) {
2895 rc = convert_context_handle_invalid_context(&newcon);
Eric Paris4b02b522010-11-23 11:40:08 -05002896 if (rc) {
2897 if (!context_struct_to_string(&newcon, &s, &len)) {
Richard Guy Briggs4093a842014-09-18 20:47:48 -04002898 audit_log(current->audit_context,
2899 GFP_ATOMIC, AUDIT_SELINUX_ERR,
2900 "op=security_sid_mls_copy "
2901 "invalid_context=%s", s);
Eric Paris4b02b522010-11-23 11:40:08 -05002902 kfree(s);
2903 }
2904 goto out_unlock;
2905 }
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002906 }
2907
2908 rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid);
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002909out_unlock:
James Morris0804d112008-06-06 18:40:29 +10002910 read_unlock(&policy_rwlock);
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002911 context_destroy(&newcon);
2912out:
2913 return rc;
2914}
2915
Paul Moore220deb92008-01-29 08:38:23 -05002916/**
2917 * security_net_peersid_resolve - Compare and resolve two network peer SIDs
2918 * @nlbl_sid: NetLabel SID
2919 * @nlbl_type: NetLabel labeling protocol type
2920 * @xfrm_sid: XFRM SID
2921 *
2922 * Description:
2923 * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be
2924 * resolved into a single SID it is returned via @peer_sid and the function
2925 * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function
2926 * returns a negative value. A table summarizing the behavior is below:
2927 *
2928 * | function return | @sid
2929 * ------------------------------+-----------------+-----------------
2930 * no peer labels | 0 | SECSID_NULL
2931 * single peer label | 0 | <peer_label>
2932 * multiple, consistent labels | 0 | <peer_label>
2933 * multiple, inconsistent labels | -<errno> | SECSID_NULL
2934 *
2935 */
2936int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
2937 u32 xfrm_sid,
2938 u32 *peer_sid)
2939{
2940 int rc;
2941 struct context *nlbl_ctx;
2942 struct context *xfrm_ctx;
2943
Eric Paris4b02b522010-11-23 11:40:08 -05002944 *peer_sid = SECSID_NULL;
2945
Paul Moore220deb92008-01-29 08:38:23 -05002946 /* handle the common (which also happens to be the set of easy) cases
2947 * right away, these two if statements catch everything involving a
2948 * single or absent peer SID/label */
2949 if (xfrm_sid == SECSID_NULL) {
2950 *peer_sid = nlbl_sid;
2951 return 0;
2952 }
2953 /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label
2954 * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label
2955 * is present */
2956 if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) {
2957 *peer_sid = xfrm_sid;
2958 return 0;
2959 }
2960
2961 /* we don't need to check ss_initialized here since the only way both
2962 * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the
2963 * security server was initialized and ss_initialized was true */
Eric Paris4b02b522010-11-23 11:40:08 -05002964 if (!policydb.mls_enabled)
Paul Moore220deb92008-01-29 08:38:23 -05002965 return 0;
Paul Moore220deb92008-01-29 08:38:23 -05002966
James Morris0804d112008-06-06 18:40:29 +10002967 read_lock(&policy_rwlock);
Paul Moore220deb92008-01-29 08:38:23 -05002968
Eric Paris4b02b522010-11-23 11:40:08 -05002969 rc = -EINVAL;
Paul Moore220deb92008-01-29 08:38:23 -05002970 nlbl_ctx = sidtab_search(&sidtab, nlbl_sid);
2971 if (!nlbl_ctx) {
Eric Paris744ba352008-04-17 11:52:44 -04002972 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
2973 __func__, nlbl_sid);
Eric Paris4b02b522010-11-23 11:40:08 -05002974 goto out;
Paul Moore220deb92008-01-29 08:38:23 -05002975 }
Eric Paris4b02b522010-11-23 11:40:08 -05002976 rc = -EINVAL;
Paul Moore220deb92008-01-29 08:38:23 -05002977 xfrm_ctx = sidtab_search(&sidtab, xfrm_sid);
2978 if (!xfrm_ctx) {
Eric Paris744ba352008-04-17 11:52:44 -04002979 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
2980 __func__, xfrm_sid);
Eric Paris4b02b522010-11-23 11:40:08 -05002981 goto out;
Paul Moore220deb92008-01-29 08:38:23 -05002982 }
2983 rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES);
Eric Paris4b02b522010-11-23 11:40:08 -05002984 if (rc)
2985 goto out;
Paul Moore220deb92008-01-29 08:38:23 -05002986
Eric Paris4b02b522010-11-23 11:40:08 -05002987 /* at present NetLabel SIDs/labels really only carry MLS
2988 * information so if the MLS portion of the NetLabel SID
2989 * matches the MLS portion of the labeled XFRM SID/label
2990 * then pass along the XFRM SID as it is the most
2991 * expressive */
2992 *peer_sid = xfrm_sid;
2993out:
James Morris0804d112008-06-06 18:40:29 +10002994 read_unlock(&policy_rwlock);
Paul Moore220deb92008-01-29 08:38:23 -05002995 return rc;
2996}
2997
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002998static int get_classes_callback(void *k, void *d, void *args)
2999{
3000 struct class_datum *datum = d;
3001 char *name = k, **classes = args;
3002 int value = datum->value - 1;
3003
3004 classes[value] = kstrdup(name, GFP_ATOMIC);
3005 if (!classes[value])
3006 return -ENOMEM;
3007
3008 return 0;
3009}
3010
3011int security_get_classes(char ***classes, int *nclasses)
3012{
Eric Paris4b02b522010-11-23 11:40:08 -05003013 int rc;
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04003014
James Morris0804d112008-06-06 18:40:29 +10003015 read_lock(&policy_rwlock);
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04003016
Eric Paris4b02b522010-11-23 11:40:08 -05003017 rc = -ENOMEM;
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04003018 *nclasses = policydb.p_classes.nprim;
Julia Lawall9f59f902009-12-06 10:16:51 +01003019 *classes = kcalloc(*nclasses, sizeof(**classes), GFP_ATOMIC);
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04003020 if (!*classes)
3021 goto out;
3022
3023 rc = hashtab_map(policydb.p_classes.table, get_classes_callback,
3024 *classes);
Eric Paris4b02b522010-11-23 11:40:08 -05003025 if (rc) {
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04003026 int i;
3027 for (i = 0; i < *nclasses; i++)
3028 kfree((*classes)[i]);
3029 kfree(*classes);
3030 }
3031
3032out:
James Morris0804d112008-06-06 18:40:29 +10003033 read_unlock(&policy_rwlock);
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04003034 return rc;
3035}
3036
3037static int get_permissions_callback(void *k, void *d, void *args)
3038{
3039 struct perm_datum *datum = d;
3040 char *name = k, **perms = args;
3041 int value = datum->value - 1;
3042
3043 perms[value] = kstrdup(name, GFP_ATOMIC);
3044 if (!perms[value])
3045 return -ENOMEM;
3046
3047 return 0;
3048}
3049
3050int security_get_permissions(char *class, char ***perms, int *nperms)
3051{
Eric Paris4b02b522010-11-23 11:40:08 -05003052 int rc, i;
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04003053 struct class_datum *match;
3054
James Morris0804d112008-06-06 18:40:29 +10003055 read_lock(&policy_rwlock);
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04003056
Eric Paris4b02b522010-11-23 11:40:08 -05003057 rc = -EINVAL;
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04003058 match = hashtab_search(policydb.p_classes.table, class);
3059 if (!match) {
Eric Paris744ba352008-04-17 11:52:44 -04003060 printk(KERN_ERR "SELinux: %s: unrecognized class %s\n",
Harvey Harrisondd6f9532008-03-06 10:03:59 +11003061 __func__, class);
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04003062 goto out;
3063 }
3064
Eric Paris4b02b522010-11-23 11:40:08 -05003065 rc = -ENOMEM;
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04003066 *nperms = match->permissions.nprim;
Julia Lawall9f59f902009-12-06 10:16:51 +01003067 *perms = kcalloc(*nperms, sizeof(**perms), GFP_ATOMIC);
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04003068 if (!*perms)
3069 goto out;
3070
3071 if (match->comdatum) {
3072 rc = hashtab_map(match->comdatum->permissions.table,
3073 get_permissions_callback, *perms);
Eric Paris4b02b522010-11-23 11:40:08 -05003074 if (rc)
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04003075 goto err;
3076 }
3077
3078 rc = hashtab_map(match->permissions.table, get_permissions_callback,
3079 *perms);
Eric Paris4b02b522010-11-23 11:40:08 -05003080 if (rc)
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04003081 goto err;
3082
3083out:
James Morris0804d112008-06-06 18:40:29 +10003084 read_unlock(&policy_rwlock);
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04003085 return rc;
3086
3087err:
James Morris0804d112008-06-06 18:40:29 +10003088 read_unlock(&policy_rwlock);
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04003089 for (i = 0; i < *nperms; i++)
3090 kfree((*perms)[i]);
3091 kfree(*perms);
3092 return rc;
3093}
3094
Eric Paris3f120702007-09-21 14:37:10 -04003095int security_get_reject_unknown(void)
3096{
3097 return policydb.reject_unknown;
3098}
3099
3100int security_get_allow_unknown(void)
3101{
3102 return policydb.allow_unknown;
3103}
3104
Paul Moore3bb56b22008-01-29 08:38:19 -05003105/**
Paul Moore3bb56b22008-01-29 08:38:19 -05003106 * security_policycap_supported - Check for a specific policy capability
3107 * @req_cap: capability
3108 *
3109 * Description:
3110 * This function queries the currently loaded policy to see if it supports the
3111 * capability specified by @req_cap. Returns true (1) if the capability is
3112 * supported, false (0) if it isn't supported.
3113 *
3114 */
3115int security_policycap_supported(unsigned int req_cap)
3116{
3117 int rc;
3118
James Morris0804d112008-06-06 18:40:29 +10003119 read_lock(&policy_rwlock);
Paul Moore3bb56b22008-01-29 08:38:19 -05003120 rc = ebitmap_get_bit(&policydb.policycaps, req_cap);
James Morris0804d112008-06-06 18:40:29 +10003121 read_unlock(&policy_rwlock);
Paul Moore3bb56b22008-01-29 08:38:19 -05003122
3123 return rc;
3124}
3125
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003126struct selinux_audit_rule {
3127 u32 au_seqno;
3128 struct context au_ctxt;
3129};
3130
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +02003131void selinux_audit_rule_free(void *vrule)
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003132{
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +02003133 struct selinux_audit_rule *rule = vrule;
3134
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003135 if (rule) {
3136 context_destroy(&rule->au_ctxt);
3137 kfree(rule);
3138 }
3139}
3140
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +02003141int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003142{
3143 struct selinux_audit_rule *tmprule;
3144 struct role_datum *roledatum;
3145 struct type_datum *typedatum;
3146 struct user_datum *userdatum;
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +02003147 struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003148 int rc = 0;
3149
3150 *rule = NULL;
3151
3152 if (!ss_initialized)
Steve G3ad40d62007-08-14 12:50:46 -07003153 return -EOPNOTSUPP;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003154
3155 switch (field) {
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05003156 case AUDIT_SUBJ_USER:
3157 case AUDIT_SUBJ_ROLE:
3158 case AUDIT_SUBJ_TYPE:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05003159 case AUDIT_OBJ_USER:
3160 case AUDIT_OBJ_ROLE:
3161 case AUDIT_OBJ_TYPE:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003162 /* only 'equals' and 'not equals' fit user, role, and type */
Al Viro5af75d82008-12-16 05:59:26 -05003163 if (op != Audit_equal && op != Audit_not_equal)
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003164 return -EINVAL;
3165 break;
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05003166 case AUDIT_SUBJ_SEN:
3167 case AUDIT_SUBJ_CLR:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05003168 case AUDIT_OBJ_LEV_LOW:
3169 case AUDIT_OBJ_LEV_HIGH:
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003170 /* we do not allow a range, indicated by the presence of '-' */
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003171 if (strchr(rulestr, '-'))
3172 return -EINVAL;
3173 break;
3174 default:
3175 /* only the above fields are valid */
3176 return -EINVAL;
3177 }
3178
3179 tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL);
3180 if (!tmprule)
3181 return -ENOMEM;
3182
3183 context_init(&tmprule->au_ctxt);
3184
James Morris0804d112008-06-06 18:40:29 +10003185 read_lock(&policy_rwlock);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003186
3187 tmprule->au_seqno = latest_granting;
3188
3189 switch (field) {
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05003190 case AUDIT_SUBJ_USER:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05003191 case AUDIT_OBJ_USER:
Eric Paris4b02b522010-11-23 11:40:08 -05003192 rc = -EINVAL;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003193 userdatum = hashtab_search(policydb.p_users.table, rulestr);
3194 if (!userdatum)
Eric Paris4b02b522010-11-23 11:40:08 -05003195 goto out;
3196 tmprule->au_ctxt.user = userdatum->value;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003197 break;
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05003198 case AUDIT_SUBJ_ROLE:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05003199 case AUDIT_OBJ_ROLE:
Eric Paris4b02b522010-11-23 11:40:08 -05003200 rc = -EINVAL;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003201 roledatum = hashtab_search(policydb.p_roles.table, rulestr);
3202 if (!roledatum)
Eric Paris4b02b522010-11-23 11:40:08 -05003203 goto out;
3204 tmprule->au_ctxt.role = roledatum->value;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003205 break;
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05003206 case AUDIT_SUBJ_TYPE:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05003207 case AUDIT_OBJ_TYPE:
Eric Paris4b02b522010-11-23 11:40:08 -05003208 rc = -EINVAL;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003209 typedatum = hashtab_search(policydb.p_types.table, rulestr);
3210 if (!typedatum)
Eric Paris4b02b522010-11-23 11:40:08 -05003211 goto out;
3212 tmprule->au_ctxt.type = typedatum->value;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003213 break;
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05003214 case AUDIT_SUBJ_SEN:
3215 case AUDIT_SUBJ_CLR:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05003216 case AUDIT_OBJ_LEV_LOW:
3217 case AUDIT_OBJ_LEV_HIGH:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003218 rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC);
Eric Paris4b02b522010-11-23 11:40:08 -05003219 if (rc)
3220 goto out;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003221 break;
3222 }
Eric Paris4b02b522010-11-23 11:40:08 -05003223 rc = 0;
3224out:
James Morris0804d112008-06-06 18:40:29 +10003225 read_unlock(&policy_rwlock);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003226
3227 if (rc) {
3228 selinux_audit_rule_free(tmprule);
3229 tmprule = NULL;
3230 }
3231
3232 *rule = tmprule;
3233
3234 return rc;
3235}
3236
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +02003237/* Check to see if the rule contains any selinux fields */
3238int selinux_audit_rule_known(struct audit_krule *rule)
3239{
3240 int i;
3241
3242 for (i = 0; i < rule->field_count; i++) {
3243 struct audit_field *f = &rule->fields[i];
3244 switch (f->type) {
3245 case AUDIT_SUBJ_USER:
3246 case AUDIT_SUBJ_ROLE:
3247 case AUDIT_SUBJ_TYPE:
3248 case AUDIT_SUBJ_SEN:
3249 case AUDIT_SUBJ_CLR:
3250 case AUDIT_OBJ_USER:
3251 case AUDIT_OBJ_ROLE:
3252 case AUDIT_OBJ_TYPE:
3253 case AUDIT_OBJ_LEV_LOW:
3254 case AUDIT_OBJ_LEV_HIGH:
3255 return 1;
3256 }
3257 }
3258
3259 return 0;
3260}
3261
3262int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule,
Eric Parisf5269712008-05-14 11:27:45 -04003263 struct audit_context *actx)
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003264{
3265 struct context *ctxt;
3266 struct mls_level *level;
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +02003267 struct selinux_audit_rule *rule = vrule;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003268 int match = 0;
3269
Richard Guy Briggs9ad42a72013-11-21 13:31:40 -05003270 if (unlikely(!rule)) {
3271 WARN_ONCE(1, "selinux_audit_rule_match: missing rule\n");
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003272 return -ENOENT;
3273 }
3274
James Morris0804d112008-06-06 18:40:29 +10003275 read_lock(&policy_rwlock);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003276
3277 if (rule->au_seqno < latest_granting) {
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003278 match = -ESTALE;
3279 goto out;
3280 }
3281
Stephen Smalley9a2f44f2006-09-25 23:31:58 -07003282 ctxt = sidtab_search(&sidtab, sid);
Richard Guy Briggs9ad42a72013-11-21 13:31:40 -05003283 if (unlikely(!ctxt)) {
3284 WARN_ONCE(1, "selinux_audit_rule_match: unrecognized SID %d\n",
Eric Paris5d55a342008-04-18 17:38:33 -04003285 sid);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003286 match = -ENOENT;
3287 goto out;
3288 }
3289
3290 /* a field/op pair that is not caught here will simply fall through
3291 without a match */
3292 switch (field) {
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05003293 case AUDIT_SUBJ_USER:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05003294 case AUDIT_OBJ_USER:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003295 switch (op) {
Al Viro5af75d82008-12-16 05:59:26 -05003296 case Audit_equal:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003297 match = (ctxt->user == rule->au_ctxt.user);
3298 break;
Al Viro5af75d82008-12-16 05:59:26 -05003299 case Audit_not_equal:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003300 match = (ctxt->user != rule->au_ctxt.user);
3301 break;
3302 }
3303 break;
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05003304 case AUDIT_SUBJ_ROLE:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05003305 case AUDIT_OBJ_ROLE:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003306 switch (op) {
Al Viro5af75d82008-12-16 05:59:26 -05003307 case Audit_equal:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003308 match = (ctxt->role == rule->au_ctxt.role);
3309 break;
Al Viro5af75d82008-12-16 05:59:26 -05003310 case Audit_not_equal:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003311 match = (ctxt->role != rule->au_ctxt.role);
3312 break;
3313 }
3314 break;
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05003315 case AUDIT_SUBJ_TYPE:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05003316 case AUDIT_OBJ_TYPE:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003317 switch (op) {
Al Viro5af75d82008-12-16 05:59:26 -05003318 case Audit_equal:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003319 match = (ctxt->type == rule->au_ctxt.type);
3320 break;
Al Viro5af75d82008-12-16 05:59:26 -05003321 case Audit_not_equal:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003322 match = (ctxt->type != rule->au_ctxt.type);
3323 break;
3324 }
3325 break;
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05003326 case AUDIT_SUBJ_SEN:
3327 case AUDIT_SUBJ_CLR:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05003328 case AUDIT_OBJ_LEV_LOW:
3329 case AUDIT_OBJ_LEV_HIGH:
3330 level = ((field == AUDIT_SUBJ_SEN ||
Eric Paris5d55a342008-04-18 17:38:33 -04003331 field == AUDIT_OBJ_LEV_LOW) ?
3332 &ctxt->range.level[0] : &ctxt->range.level[1]);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003333 switch (op) {
Al Viro5af75d82008-12-16 05:59:26 -05003334 case Audit_equal:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003335 match = mls_level_eq(&rule->au_ctxt.range.level[0],
Eric Paris5d55a342008-04-18 17:38:33 -04003336 level);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003337 break;
Al Viro5af75d82008-12-16 05:59:26 -05003338 case Audit_not_equal:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003339 match = !mls_level_eq(&rule->au_ctxt.range.level[0],
Eric Paris5d55a342008-04-18 17:38:33 -04003340 level);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003341 break;
Al Viro5af75d82008-12-16 05:59:26 -05003342 case Audit_lt:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003343 match = (mls_level_dom(&rule->au_ctxt.range.level[0],
Eric Paris5d55a342008-04-18 17:38:33 -04003344 level) &&
3345 !mls_level_eq(&rule->au_ctxt.range.level[0],
3346 level));
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003347 break;
Al Viro5af75d82008-12-16 05:59:26 -05003348 case Audit_le:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003349 match = mls_level_dom(&rule->au_ctxt.range.level[0],
Eric Paris5d55a342008-04-18 17:38:33 -04003350 level);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003351 break;
Al Viro5af75d82008-12-16 05:59:26 -05003352 case Audit_gt:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003353 match = (mls_level_dom(level,
Eric Paris5d55a342008-04-18 17:38:33 -04003354 &rule->au_ctxt.range.level[0]) &&
3355 !mls_level_eq(level,
3356 &rule->au_ctxt.range.level[0]));
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003357 break;
Al Viro5af75d82008-12-16 05:59:26 -05003358 case Audit_ge:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003359 match = mls_level_dom(level,
Eric Paris5d55a342008-04-18 17:38:33 -04003360 &rule->au_ctxt.range.level[0]);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003361 break;
3362 }
3363 }
3364
3365out:
James Morris0804d112008-06-06 18:40:29 +10003366 read_unlock(&policy_rwlock);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003367 return match;
3368}
3369
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +02003370static int (*aurule_callback)(void) = audit_update_lsm_rules;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003371
Wanlong Gao562c99f2012-03-07 22:17:14 +08003372static int aurule_avc_callback(u32 event)
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003373{
3374 int err = 0;
3375
3376 if (event == AVC_CALLBACK_RESET && aurule_callback)
3377 err = aurule_callback();
3378 return err;
3379}
3380
3381static int __init aurule_init(void)
3382{
3383 int err;
3384
Wanlong Gao562c99f2012-03-07 22:17:14 +08003385 err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003386 if (err)
3387 panic("avc_add_callback() failed, error %d\n", err);
3388
3389 return err;
3390}
3391__initcall(aurule_init);
3392
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003393#ifdef CONFIG_NETLABEL
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003394/**
Paul Moore5778eab2007-02-28 15:14:22 -05003395 * security_netlbl_cache_add - Add an entry to the NetLabel cache
3396 * @secattr: the NetLabel packet security attributes
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003397 * @sid: the SELinux SID
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003398 *
3399 * Description:
3400 * Attempt to cache the context in @ctx, which was derived from the packet in
Paul Moore5778eab2007-02-28 15:14:22 -05003401 * @skb, in the NetLabel subsystem cache. This function assumes @secattr has
3402 * already been initialized.
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003403 *
3404 */
Paul Moore5778eab2007-02-28 15:14:22 -05003405static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr,
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003406 u32 sid)
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003407{
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003408 u32 *sid_cache;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003409
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003410 sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC);
3411 if (sid_cache == NULL)
3412 return;
Paul Moore5778eab2007-02-28 15:14:22 -05003413 secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC);
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003414 if (secattr->cache == NULL) {
3415 kfree(sid_cache);
Paul Moore5778eab2007-02-28 15:14:22 -05003416 return;
Jesper Juhl0ec8abd2007-07-21 00:12:44 +02003417 }
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003418
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003419 *sid_cache = sid;
3420 secattr->cache->free = kfree;
3421 secattr->cache->data = sid_cache;
Paul Moore5778eab2007-02-28 15:14:22 -05003422 secattr->flags |= NETLBL_SECATTR_CACHE;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003423}
3424
3425/**
Paul Moore5778eab2007-02-28 15:14:22 -05003426 * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003427 * @secattr: the NetLabel packet security attributes
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003428 * @sid: the SELinux SID
3429 *
3430 * Description:
Paul Moore5778eab2007-02-28 15:14:22 -05003431 * Convert the given NetLabel security attributes in @secattr into a
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003432 * SELinux SID. If the @secattr field does not contain a full SELinux
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003433 * SID/context then use SECINITSID_NETMSG as the foundation. If possible the
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003434 * 'cache' field of @secattr is set and the CACHE flag is set; this is to
3435 * allow the @secattr to be used by NetLabel to cache the secattr to SID
3436 * conversion for future lookups. Returns zero on success, negative values on
3437 * failure.
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003438 *
3439 */
Paul Moore5778eab2007-02-28 15:14:22 -05003440int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
Paul Moore5778eab2007-02-28 15:14:22 -05003441 u32 *sid)
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003442{
Eric Paris7ae9f232010-11-23 11:40:09 -05003443 int rc;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003444 struct context *ctx;
3445 struct context ctx_new;
Paul Moore5778eab2007-02-28 15:14:22 -05003446
3447 if (!ss_initialized) {
3448 *sid = SECSID_NULL;
3449 return 0;
3450 }
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003451
James Morris0804d112008-06-06 18:40:29 +10003452 read_lock(&policy_rwlock);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003453
Eric Paris7ae9f232010-11-23 11:40:09 -05003454 if (secattr->flags & NETLBL_SECATTR_CACHE)
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003455 *sid = *(u32 *)secattr->cache->data;
Eric Paris7ae9f232010-11-23 11:40:09 -05003456 else if (secattr->flags & NETLBL_SECATTR_SECID)
Paul Moore16efd452008-01-29 08:37:59 -05003457 *sid = secattr->attr.secid;
Eric Paris7ae9f232010-11-23 11:40:09 -05003458 else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) {
3459 rc = -EIDRM;
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003460 ctx = sidtab_search(&sidtab, SECINITSID_NETMSG);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003461 if (ctx == NULL)
Eric Paris7ae9f232010-11-23 11:40:09 -05003462 goto out;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003463
Paul Moore81990fb2008-10-03 10:51:15 -04003464 context_init(&ctx_new);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003465 ctx_new.user = ctx->user;
3466 ctx_new.role = ctx->role;
3467 ctx_new.type = ctx->type;
Paul Moore02752762006-11-29 13:18:18 -05003468 mls_import_netlbl_lvl(&ctx_new, secattr);
Paul Moore701a90b2006-11-17 17:38:46 -05003469 if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
Paul Mooreda8026f2015-02-17 15:30:23 -05003470 rc = mls_import_netlbl_cat(&ctx_new, secattr);
Eric Paris7ae9f232010-11-23 11:40:09 -05003471 if (rc)
3472 goto out;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003473 }
Eric Paris7ae9f232010-11-23 11:40:09 -05003474 rc = -EIDRM;
3475 if (!mls_context_isvalid(&policydb, &ctx_new))
3476 goto out_free;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003477
3478 rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid);
Eric Paris7ae9f232010-11-23 11:40:09 -05003479 if (rc)
3480 goto out_free;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003481
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003482 security_netlbl_cache_add(secattr, *sid);
Paul Moore5778eab2007-02-28 15:14:22 -05003483
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003484 ebitmap_destroy(&ctx_new.range.level[0].cat);
Eric Paris7ae9f232010-11-23 11:40:09 -05003485 } else
paul.moore@hp.com388b2402006-10-05 18:28:24 -04003486 *sid = SECSID_NULL;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003487
Eric Paris7ae9f232010-11-23 11:40:09 -05003488 read_unlock(&policy_rwlock);
3489 return 0;
3490out_free:
3491 ebitmap_destroy(&ctx_new.range.level[0].cat);
3492out:
James Morris0804d112008-06-06 18:40:29 +10003493 read_unlock(&policy_rwlock);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003494 return rc;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003495}
3496
3497/**
Paul Moore5778eab2007-02-28 15:14:22 -05003498 * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr
3499 * @sid: the SELinux SID
3500 * @secattr: the NetLabel packet security attributes
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003501 *
3502 * Description:
Paul Moore5778eab2007-02-28 15:14:22 -05003503 * Convert the given SELinux SID in @sid into a NetLabel security attribute.
3504 * Returns zero on success, negative values on failure.
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003505 *
3506 */
Paul Moore5778eab2007-02-28 15:14:22 -05003507int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr)
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003508{
Paul Moore99d854d2008-10-10 10:16:30 -04003509 int rc;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003510 struct context *ctx;
3511
3512 if (!ss_initialized)
3513 return 0;
3514
James Morris0804d112008-06-06 18:40:29 +10003515 read_lock(&policy_rwlock);
Eric Paris4b02b522010-11-23 11:40:08 -05003516
3517 rc = -ENOENT;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003518 ctx = sidtab_search(&sidtab, sid);
Eric Paris4b02b522010-11-23 11:40:08 -05003519 if (ctx == NULL)
3520 goto out;
3521
3522 rc = -ENOMEM;
Eric Parisac76c052010-11-29 15:47:09 -05003523 secattr->domain = kstrdup(sym_name(&policydb, SYM_TYPES, ctx->type - 1),
Paul Moore5778eab2007-02-28 15:14:22 -05003524 GFP_ATOMIC);
Eric Paris4b02b522010-11-23 11:40:08 -05003525 if (secattr->domain == NULL)
3526 goto out;
3527
Paul Moore8d758992008-10-10 10:16:33 -04003528 secattr->attr.secid = sid;
3529 secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID;
Paul Moore5778eab2007-02-28 15:14:22 -05003530 mls_export_netlbl_lvl(ctx, secattr);
3531 rc = mls_export_netlbl_cat(ctx, secattr);
Eric Paris4b02b522010-11-23 11:40:08 -05003532out:
James Morris0804d112008-06-06 18:40:29 +10003533 read_unlock(&policy_rwlock);
Paul Mooref8687af2006-10-30 15:22:15 -08003534 return rc;
3535}
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003536#endif /* CONFIG_NETLABEL */
Eric Pariscee74f42010-10-13 17:50:25 -04003537
3538/**
3539 * security_read_policy - read the policy.
3540 * @data: binary policy data
3541 * @len: length of data in bytes
3542 *
3543 */
Eric Paris6b697322011-04-20 10:21:28 -04003544int security_read_policy(void **data, size_t *len)
Eric Pariscee74f42010-10-13 17:50:25 -04003545{
3546 int rc;
3547 struct policy_file fp;
3548
3549 if (!ss_initialized)
3550 return -EINVAL;
3551
3552 *len = security_policydb_len();
3553
Eric Paris845ca302010-10-13 17:50:31 -04003554 *data = vmalloc_user(*len);
Eric Pariscee74f42010-10-13 17:50:25 -04003555 if (!*data)
3556 return -ENOMEM;
3557
3558 fp.data = *data;
3559 fp.len = *len;
3560
3561 read_lock(&policy_rwlock);
3562 rc = policydb_write(&policydb, &fp);
3563 read_unlock(&policy_rwlock);
3564
3565 if (rc)
3566 return rc;
3567
3568 *len = (unsigned long)fp.data - (unsigned long)*data;
3569 return 0;
3570
3571}