blob: 03f7a4748ee8fed8f6d92dcc863fda60e5b715fe [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Implementation of the security services.
3 *
4 * Authors : Stephen Smalley, <sds@epoch.ncsc.mil>
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 *
Venkat Yekkirala7420ed22006-08-04 23:17:57 -070016 * Updated: Hewlett-Packard <paul.moore@hp.com>
17 *
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
73extern void selnl_notify_policyload(u32 seqno);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Paul Moore3bb56b22008-01-29 08:38:19 -050075int selinux_policycap_netpeer;
Eric Parisb0c636b2008-02-28 12:58:40 -050076int selinux_policycap_openperm;
Paul Moore3bb56b22008-01-29 08:38:19 -050077
Linus Torvalds1da177e2005-04-16 15:20:36 -070078static DEFINE_RWLOCK(policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
80static struct sidtab sidtab;
81struct policydb policydb;
Eric Paris5d55a342008-04-18 17:38:33 -040082int ss_initialized;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84/*
85 * The largest sequence number that has been used when
86 * providing an access decision to the access vector cache.
87 * The sequence number only changes when a policy change
88 * occurs.
89 */
Eric Paris5d55a342008-04-18 17:38:33 -040090static u32 latest_granting;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92/* Forward declaration. */
93static int context_struct_to_string(struct context *context, char **scontext,
94 u32 *scontext_len);
95
Stephen Smalley19439d02010-01-14 17:28:10 -050096static void context_struct_compute_av(struct context *scontext,
97 struct context *tcontext,
98 u16 tclass,
99 struct av_decision *avd);
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400100
101struct selinux_mapping {
102 u16 value; /* policy value */
103 unsigned num_perms;
104 u32 perms[sizeof(u32) * 8];
105};
106
107static struct selinux_mapping *current_mapping;
108static u16 current_mapping_size;
109
110static int selinux_set_mapping(struct policydb *pol,
111 struct security_class_mapping *map,
112 struct selinux_mapping **out_map_p,
113 u16 *out_map_size)
114{
115 struct selinux_mapping *out_map = NULL;
116 size_t size = sizeof(struct selinux_mapping);
117 u16 i, j;
118 unsigned k;
119 bool print_unknown_handle = false;
120
121 /* Find number of classes in the input mapping */
122 if (!map)
123 return -EINVAL;
124 i = 0;
125 while (map[i].name)
126 i++;
127
128 /* Allocate space for the class records, plus one for class zero */
129 out_map = kcalloc(++i, size, GFP_ATOMIC);
130 if (!out_map)
131 return -ENOMEM;
132
133 /* Store the raw class and permission values */
134 j = 0;
135 while (map[j].name) {
136 struct security_class_mapping *p_in = map + (j++);
137 struct selinux_mapping *p_out = out_map + j;
138
139 /* An empty class string skips ahead */
140 if (!strcmp(p_in->name, "")) {
141 p_out->num_perms = 0;
142 continue;
143 }
144
145 p_out->value = string_to_security_class(pol, p_in->name);
146 if (!p_out->value) {
147 printk(KERN_INFO
148 "SELinux: Class %s not defined in policy.\n",
149 p_in->name);
150 if (pol->reject_unknown)
151 goto err;
152 p_out->num_perms = 0;
153 print_unknown_handle = true;
154 continue;
155 }
156
157 k = 0;
158 while (p_in->perms && p_in->perms[k]) {
159 /* An empty permission string skips ahead */
160 if (!*p_in->perms[k]) {
161 k++;
162 continue;
163 }
164 p_out->perms[k] = string_to_av_perm(pol, p_out->value,
165 p_in->perms[k]);
166 if (!p_out->perms[k]) {
167 printk(KERN_INFO
168 "SELinux: Permission %s in class %s not defined in policy.\n",
169 p_in->perms[k], p_in->name);
170 if (pol->reject_unknown)
171 goto err;
172 print_unknown_handle = true;
173 }
174
175 k++;
176 }
177 p_out->num_perms = k;
178 }
179
180 if (print_unknown_handle)
181 printk(KERN_INFO "SELinux: the above unknown classes and permissions will be %s\n",
182 pol->allow_unknown ? "allowed" : "denied");
183
184 *out_map_p = out_map;
185 *out_map_size = i;
186 return 0;
187err:
188 kfree(out_map);
189 return -EINVAL;
190}
191
192/*
193 * Get real, policy values from mapped values
194 */
195
196static u16 unmap_class(u16 tclass)
197{
198 if (tclass < current_mapping_size)
199 return current_mapping[tclass].value;
200
201 return tclass;
202}
203
Harry Ciao6f5317e2011-03-02 13:32:33 +0800204/*
205 * Get kernel value for class from its policy value
206 */
207static u16 map_class(u16 pol_value)
208{
209 u16 i;
210
211 for (i = 1; i < current_mapping_size; i++) {
212 if (current_mapping[i].value == pol_value)
213 return i;
214 }
215
216 return pol_value;
217}
218
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400219static void map_decision(u16 tclass, struct av_decision *avd,
220 int allow_unknown)
221{
222 if (tclass < current_mapping_size) {
223 unsigned i, n = current_mapping[tclass].num_perms;
224 u32 result;
225
226 for (i = 0, result = 0; i < n; i++) {
227 if (avd->allowed & current_mapping[tclass].perms[i])
228 result |= 1<<i;
229 if (allow_unknown && !current_mapping[tclass].perms[i])
230 result |= 1<<i;
231 }
232 avd->allowed = result;
233
234 for (i = 0, result = 0; i < n; i++)
235 if (avd->auditallow & current_mapping[tclass].perms[i])
236 result |= 1<<i;
237 avd->auditallow = result;
238
239 for (i = 0, result = 0; i < n; i++) {
240 if (avd->auditdeny & current_mapping[tclass].perms[i])
241 result |= 1<<i;
242 if (!allow_unknown && !current_mapping[tclass].perms[i])
243 result |= 1<<i;
244 }
Eric Paris0bce9522009-11-23 16:47:23 -0500245 /*
246 * In case the kernel has a bug and requests a permission
247 * between num_perms and the maximum permission number, we
248 * should audit that denial
249 */
250 for (; i < (sizeof(u32)*8); i++)
251 result |= 1<<i;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400252 avd->auditdeny = result;
253 }
254}
255
Guido Trentalancia0719aaf2010-02-03 16:40:20 +0100256int security_mls_enabled(void)
257{
258 return policydb.mls_enabled;
259}
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400260
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261/*
262 * Return the boolean value of a constraint expression
263 * when it is applied to the specified source and target
264 * security contexts.
265 *
266 * xcontext is a special beast... It is used by the validatetrans rules
267 * only. For these rules, scontext is the context before the transition,
268 * tcontext is the context after the transition, and xcontext is the context
269 * of the process performing the transition. All other callers of
270 * constraint_expr_eval should pass in NULL for xcontext.
271 */
272static int constraint_expr_eval(struct context *scontext,
273 struct context *tcontext,
274 struct context *xcontext,
275 struct constraint_expr *cexpr)
276{
277 u32 val1, val2;
278 struct context *c;
279 struct role_datum *r1, *r2;
280 struct mls_level *l1, *l2;
281 struct constraint_expr *e;
282 int s[CEXPR_MAXDEPTH];
283 int sp = -1;
284
285 for (e = cexpr; e; e = e->next) {
286 switch (e->expr_type) {
287 case CEXPR_NOT:
288 BUG_ON(sp < 0);
289 s[sp] = !s[sp];
290 break;
291 case CEXPR_AND:
292 BUG_ON(sp < 1);
293 sp--;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800294 s[sp] &= s[sp + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 break;
296 case CEXPR_OR:
297 BUG_ON(sp < 1);
298 sp--;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800299 s[sp] |= s[sp + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 break;
301 case CEXPR_ATTR:
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800302 if (sp == (CEXPR_MAXDEPTH - 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 return 0;
304 switch (e->attr) {
305 case CEXPR_USER:
306 val1 = scontext->user;
307 val2 = tcontext->user;
308 break;
309 case CEXPR_TYPE:
310 val1 = scontext->type;
311 val2 = tcontext->type;
312 break;
313 case CEXPR_ROLE:
314 val1 = scontext->role;
315 val2 = tcontext->role;
316 r1 = policydb.role_val_to_struct[val1 - 1];
317 r2 = policydb.role_val_to_struct[val2 - 1];
318 switch (e->op) {
319 case CEXPR_DOM:
320 s[++sp] = ebitmap_get_bit(&r1->dominates,
321 val2 - 1);
322 continue;
323 case CEXPR_DOMBY:
324 s[++sp] = ebitmap_get_bit(&r2->dominates,
325 val1 - 1);
326 continue;
327 case CEXPR_INCOMP:
Eric Paris5d55a342008-04-18 17:38:33 -0400328 s[++sp] = (!ebitmap_get_bit(&r1->dominates,
329 val2 - 1) &&
330 !ebitmap_get_bit(&r2->dominates,
331 val1 - 1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 continue;
333 default:
334 break;
335 }
336 break;
337 case CEXPR_L1L2:
338 l1 = &(scontext->range.level[0]);
339 l2 = &(tcontext->range.level[0]);
340 goto mls_ops;
341 case CEXPR_L1H2:
342 l1 = &(scontext->range.level[0]);
343 l2 = &(tcontext->range.level[1]);
344 goto mls_ops;
345 case CEXPR_H1L2:
346 l1 = &(scontext->range.level[1]);
347 l2 = &(tcontext->range.level[0]);
348 goto mls_ops;
349 case CEXPR_H1H2:
350 l1 = &(scontext->range.level[1]);
351 l2 = &(tcontext->range.level[1]);
352 goto mls_ops;
353 case CEXPR_L1H1:
354 l1 = &(scontext->range.level[0]);
355 l2 = &(scontext->range.level[1]);
356 goto mls_ops;
357 case CEXPR_L2H2:
358 l1 = &(tcontext->range.level[0]);
359 l2 = &(tcontext->range.level[1]);
360 goto mls_ops;
361mls_ops:
362 switch (e->op) {
363 case CEXPR_EQ:
364 s[++sp] = mls_level_eq(l1, l2);
365 continue;
366 case CEXPR_NEQ:
367 s[++sp] = !mls_level_eq(l1, l2);
368 continue;
369 case CEXPR_DOM:
370 s[++sp] = mls_level_dom(l1, l2);
371 continue;
372 case CEXPR_DOMBY:
373 s[++sp] = mls_level_dom(l2, l1);
374 continue;
375 case CEXPR_INCOMP:
376 s[++sp] = mls_level_incomp(l2, l1);
377 continue;
378 default:
379 BUG();
380 return 0;
381 }
382 break;
383 default:
384 BUG();
385 return 0;
386 }
387
388 switch (e->op) {
389 case CEXPR_EQ:
390 s[++sp] = (val1 == val2);
391 break;
392 case CEXPR_NEQ:
393 s[++sp] = (val1 != val2);
394 break;
395 default:
396 BUG();
397 return 0;
398 }
399 break;
400 case CEXPR_NAMES:
401 if (sp == (CEXPR_MAXDEPTH-1))
402 return 0;
403 c = scontext;
404 if (e->attr & CEXPR_TARGET)
405 c = tcontext;
406 else if (e->attr & CEXPR_XTARGET) {
407 c = xcontext;
408 if (!c) {
409 BUG();
410 return 0;
411 }
412 }
413 if (e->attr & CEXPR_USER)
414 val1 = c->user;
415 else if (e->attr & CEXPR_ROLE)
416 val1 = c->role;
417 else if (e->attr & CEXPR_TYPE)
418 val1 = c->type;
419 else {
420 BUG();
421 return 0;
422 }
423
424 switch (e->op) {
425 case CEXPR_EQ:
426 s[++sp] = ebitmap_get_bit(&e->names, val1 - 1);
427 break;
428 case CEXPR_NEQ:
429 s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1);
430 break;
431 default:
432 BUG();
433 return 0;
434 }
435 break;
436 default:
437 BUG();
438 return 0;
439 }
440 }
441
442 BUG_ON(sp != 0);
443 return s[0];
444}
445
446/*
KaiGai Kohei44c2d9b2009-06-18 17:26:13 +0900447 * security_dump_masked_av - dumps masked permissions during
448 * security_compute_av due to RBAC, MLS/Constraint and Type bounds.
449 */
450static int dump_masked_av_helper(void *k, void *d, void *args)
451{
452 struct perm_datum *pdatum = d;
453 char **permission_names = args;
454
455 BUG_ON(pdatum->value < 1 || pdatum->value > 32);
456
457 permission_names[pdatum->value - 1] = (char *)k;
458
459 return 0;
460}
461
462static void security_dump_masked_av(struct context *scontext,
463 struct context *tcontext,
464 u16 tclass,
465 u32 permissions,
466 const char *reason)
467{
468 struct common_datum *common_dat;
469 struct class_datum *tclass_dat;
470 struct audit_buffer *ab;
471 char *tclass_name;
472 char *scontext_name = NULL;
473 char *tcontext_name = NULL;
474 char *permission_names[32];
James Morris2da5d312010-02-16 17:29:06 +1100475 int index;
476 u32 length;
KaiGai Kohei44c2d9b2009-06-18 17:26:13 +0900477 bool need_comma = false;
478
479 if (!permissions)
480 return;
481
Eric Parisac76c052010-11-29 15:47:09 -0500482 tclass_name = sym_name(&policydb, SYM_CLASSES, tclass - 1);
KaiGai Kohei44c2d9b2009-06-18 17:26:13 +0900483 tclass_dat = policydb.class_val_to_struct[tclass - 1];
484 common_dat = tclass_dat->comdatum;
485
486 /* init permission_names */
487 if (common_dat &&
488 hashtab_map(common_dat->permissions.table,
489 dump_masked_av_helper, permission_names) < 0)
490 goto out;
491
492 if (hashtab_map(tclass_dat->permissions.table,
493 dump_masked_av_helper, permission_names) < 0)
494 goto out;
495
496 /* get scontext/tcontext in text form */
497 if (context_struct_to_string(scontext,
498 &scontext_name, &length) < 0)
499 goto out;
500
501 if (context_struct_to_string(tcontext,
502 &tcontext_name, &length) < 0)
503 goto out;
504
505 /* audit a message */
506 ab = audit_log_start(current->audit_context,
507 GFP_ATOMIC, AUDIT_SELINUX_ERR);
508 if (!ab)
509 goto out;
510
511 audit_log_format(ab, "op=security_compute_av reason=%s "
512 "scontext=%s tcontext=%s tclass=%s perms=",
513 reason, scontext_name, tcontext_name, tclass_name);
514
515 for (index = 0; index < 32; index++) {
516 u32 mask = (1 << index);
517
518 if ((mask & permissions) == 0)
519 continue;
520
521 audit_log_format(ab, "%s%s",
522 need_comma ? "," : "",
523 permission_names[index]
524 ? permission_names[index] : "????");
525 need_comma = true;
526 }
527 audit_log_end(ab);
528out:
529 /* release scontext/tcontext */
530 kfree(tcontext_name);
531 kfree(scontext_name);
532
533 return;
534}
535
536/*
KaiGai Koheid9250de2008-08-28 16:35:57 +0900537 * security_boundary_permission - drops violated permissions
538 * on boundary constraint.
539 */
540static void type_attribute_bounds_av(struct context *scontext,
541 struct context *tcontext,
542 u16 tclass,
KaiGai Koheid9250de2008-08-28 16:35:57 +0900543 struct av_decision *avd)
544{
KaiGai Kohei2ae3ba32010-02-17 08:49:41 +0900545 struct context lo_scontext;
546 struct context lo_tcontext;
547 struct av_decision lo_avd;
Eric Paris23bdecb2010-11-29 15:47:09 -0500548 struct type_datum *source;
549 struct type_datum *target;
KaiGai Kohei2ae3ba32010-02-17 08:49:41 +0900550 u32 masked = 0;
KaiGai Koheid9250de2008-08-28 16:35:57 +0900551
Eric Paris23bdecb2010-11-29 15:47:09 -0500552 source = flex_array_get_ptr(policydb.type_val_to_struct_array,
553 scontext->type - 1);
554 BUG_ON(!source);
555
556 target = flex_array_get_ptr(policydb.type_val_to_struct_array,
557 tcontext->type - 1);
558 BUG_ON(!target);
559
KaiGai Koheid9250de2008-08-28 16:35:57 +0900560 if (source->bounds) {
561 memset(&lo_avd, 0, sizeof(lo_avd));
562
563 memcpy(&lo_scontext, scontext, sizeof(lo_scontext));
564 lo_scontext.type = source->bounds;
565
566 context_struct_compute_av(&lo_scontext,
567 tcontext,
568 tclass,
KaiGai Koheid9250de2008-08-28 16:35:57 +0900569 &lo_avd);
570 if ((lo_avd.allowed & avd->allowed) == avd->allowed)
571 return; /* no masked permission */
572 masked = ~lo_avd.allowed & avd->allowed;
KaiGai Kohei2ae3ba32010-02-17 08:49:41 +0900573 }
KaiGai Koheid9250de2008-08-28 16:35:57 +0900574
KaiGai Kohei2ae3ba32010-02-17 08:49:41 +0900575 if (target->bounds) {
576 memset(&lo_avd, 0, sizeof(lo_avd));
577
578 memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext));
579 lo_tcontext.type = target->bounds;
580
581 context_struct_compute_av(scontext,
582 &lo_tcontext,
583 tclass,
584 &lo_avd);
585 if ((lo_avd.allowed & avd->allowed) == avd->allowed)
586 return; /* no masked permission */
587 masked = ~lo_avd.allowed & avd->allowed;
588 }
589
590 if (source->bounds && target->bounds) {
591 memset(&lo_avd, 0, sizeof(lo_avd));
592 /*
593 * lo_scontext and lo_tcontext are already
594 * set up.
595 */
596
597 context_struct_compute_av(&lo_scontext,
598 &lo_tcontext,
599 tclass,
600 &lo_avd);
601 if ((lo_avd.allowed & avd->allowed) == avd->allowed)
602 return; /* no masked permission */
603 masked = ~lo_avd.allowed & avd->allowed;
604 }
605
606 if (masked) {
KaiGai Koheid9250de2008-08-28 16:35:57 +0900607 /* mask violated permissions */
608 avd->allowed &= ~masked;
609
KaiGai Kohei44c2d9b2009-06-18 17:26:13 +0900610 /* audit masked permissions */
611 security_dump_masked_av(scontext, tcontext,
612 tclass, masked, "bounds");
KaiGai Koheid9250de2008-08-28 16:35:57 +0900613 }
614}
615
616/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 * Compute access vectors based on a context structure pair for
618 * the permissions in a particular class.
619 */
Stephen Smalley19439d02010-01-14 17:28:10 -0500620static void context_struct_compute_av(struct context *scontext,
621 struct context *tcontext,
622 u16 tclass,
623 struct av_decision *avd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624{
625 struct constraint_node *constraint;
626 struct role_allow *ra;
627 struct avtab_key avkey;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700628 struct avtab_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 struct class_datum *tclass_datum;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700630 struct ebitmap *sattr, *tattr;
631 struct ebitmap_node *snode, *tnode;
632 unsigned int i, j;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 avd->allowed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 avd->auditallow = 0;
636 avd->auditdeny = 0xffffffff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400638 if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) {
639 if (printk_ratelimit())
640 printk(KERN_WARNING "SELinux: Invalid class %hu\n", tclass);
Stephen Smalley19439d02010-01-14 17:28:10 -0500641 return;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400642 }
Eric Paris3f120702007-09-21 14:37:10 -0400643
644 tclass_datum = policydb.class_val_to_struct[tclass - 1];
645
646 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 * If a specific type enforcement rule was defined for
648 * this permission check, then use it.
649 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 avkey.target_class = tclass;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700651 avkey.specified = AVTAB_AV;
Eric Paris6371dcd2010-07-29 23:02:34 -0400652 sattr = flex_array_get(policydb.type_attr_map_array, scontext->type - 1);
653 BUG_ON(!sattr);
654 tattr = flex_array_get(policydb.type_attr_map_array, tcontext->type - 1);
655 BUG_ON(!tattr);
KaiGai Kohei9fe79ad2007-09-29 02:20:55 +0900656 ebitmap_for_each_positive_bit(sattr, snode, i) {
657 ebitmap_for_each_positive_bit(tattr, tnode, j) {
Stephen Smalley782ebb92005-09-03 15:55:16 -0700658 avkey.source_type = i + 1;
659 avkey.target_type = j + 1;
660 for (node = avtab_search_node(&policydb.te_avtab, &avkey);
Vesa-Matti Karidbc74c62008-08-07 03:18:20 +0300661 node;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700662 node = avtab_search_node_next(node, avkey.specified)) {
663 if (node->key.specified == AVTAB_ALLOWED)
664 avd->allowed |= node->datum.data;
665 else if (node->key.specified == AVTAB_AUDITALLOW)
666 avd->auditallow |= node->datum.data;
667 else if (node->key.specified == AVTAB_AUDITDENY)
668 avd->auditdeny &= node->datum.data;
669 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670
Stephen Smalley782ebb92005-09-03 15:55:16 -0700671 /* Check conditional av table for additional permissions */
672 cond_compute_av(&policydb.te_cond_avtab, &avkey, avd);
673
674 }
675 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
677 /*
678 * Remove any permissions prohibited by a constraint (this includes
679 * the MLS policy).
680 */
681 constraint = tclass_datum->constraints;
682 while (constraint) {
683 if ((constraint->permissions & (avd->allowed)) &&
684 !constraint_expr_eval(scontext, tcontext, NULL,
685 constraint->expr)) {
KaiGai Koheicaabbdc2009-06-18 17:30:07 +0900686 avd->allowed &= ~(constraint->permissions);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 }
688 constraint = constraint->next;
689 }
690
691 /*
692 * If checking process transition permission and the
693 * role is changing, then check the (current_role, new_role)
694 * pair.
695 */
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400696 if (tclass == policydb.process_class &&
697 (avd->allowed & policydb.process_trans_perms) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 scontext->role != tcontext->role) {
699 for (ra = policydb.role_allow; ra; ra = ra->next) {
700 if (scontext->role == ra->role &&
701 tcontext->role == ra->new_role)
702 break;
703 }
704 if (!ra)
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400705 avd->allowed &= ~policydb.process_trans_perms;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 }
707
KaiGai Koheid9250de2008-08-28 16:35:57 +0900708 /*
709 * If the given source and target types have boundary
710 * constraint, lazy checks have to mask any violated
711 * permission and notice it to userspace via audit.
712 */
713 type_attribute_bounds_av(scontext, tcontext,
Stephen Smalley19439d02010-01-14 17:28:10 -0500714 tclass, avd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715}
716
717static int security_validtrans_handle_fail(struct context *ocontext,
Eric Paris5d55a342008-04-18 17:38:33 -0400718 struct context *ncontext,
719 struct context *tcontext,
720 u16 tclass)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721{
722 char *o = NULL, *n = NULL, *t = NULL;
723 u32 olen, nlen, tlen;
724
Eric Paris4b02b522010-11-23 11:40:08 -0500725 if (context_struct_to_string(ocontext, &o, &olen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 goto out;
Eric Paris4b02b522010-11-23 11:40:08 -0500727 if (context_struct_to_string(ncontext, &n, &nlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 goto out;
Eric Paris4b02b522010-11-23 11:40:08 -0500729 if (context_struct_to_string(tcontext, &t, &tlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 goto out;
David Woodhouse9ad9ad32005-06-22 15:04:33 +0100731 audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
Eric Paris5d55a342008-04-18 17:38:33 -0400732 "security_validate_transition: denied for"
733 " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s",
Eric Parisac76c052010-11-29 15:47:09 -0500734 o, n, t, sym_name(&policydb, SYM_CLASSES, tclass-1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735out:
736 kfree(o);
737 kfree(n);
738 kfree(t);
739
740 if (!selinux_enforcing)
741 return 0;
742 return -EPERM;
743}
744
745int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400746 u16 orig_tclass)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747{
748 struct context *ocontext;
749 struct context *ncontext;
750 struct context *tcontext;
751 struct class_datum *tclass_datum;
752 struct constraint_node *constraint;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400753 u16 tclass;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 int rc = 0;
755
756 if (!ss_initialized)
757 return 0;
758
James Morris0804d112008-06-06 18:40:29 +1000759 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400761 tclass = unmap_class(orig_tclass);
762
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 if (!tclass || tclass > policydb.p_classes.nprim) {
Eric Paris744ba352008-04-17 11:52:44 -0400764 printk(KERN_ERR "SELinux: %s: unrecognized class %d\n",
765 __func__, tclass);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 rc = -EINVAL;
767 goto out;
768 }
769 tclass_datum = policydb.class_val_to_struct[tclass - 1];
770
771 ocontext = sidtab_search(&sidtab, oldsid);
772 if (!ocontext) {
Eric Paris744ba352008-04-17 11:52:44 -0400773 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
774 __func__, oldsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 rc = -EINVAL;
776 goto out;
777 }
778
779 ncontext = sidtab_search(&sidtab, newsid);
780 if (!ncontext) {
Eric Paris744ba352008-04-17 11:52:44 -0400781 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
782 __func__, newsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 rc = -EINVAL;
784 goto out;
785 }
786
787 tcontext = sidtab_search(&sidtab, tasksid);
788 if (!tcontext) {
Eric Paris744ba352008-04-17 11:52:44 -0400789 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
790 __func__, tasksid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 rc = -EINVAL;
792 goto out;
793 }
794
795 constraint = tclass_datum->validatetrans;
796 while (constraint) {
797 if (!constraint_expr_eval(ocontext, ncontext, tcontext,
Eric Paris5d55a342008-04-18 17:38:33 -0400798 constraint->expr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 rc = security_validtrans_handle_fail(ocontext, ncontext,
Eric Paris5d55a342008-04-18 17:38:33 -0400800 tcontext, tclass);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 goto out;
802 }
803 constraint = constraint->next;
804 }
805
806out:
James Morris0804d112008-06-06 18:40:29 +1000807 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 return rc;
809}
810
KaiGai Koheid9250de2008-08-28 16:35:57 +0900811/*
812 * security_bounded_transition - check whether the given
813 * transition is directed to bounded, or not.
814 * It returns 0, if @newsid is bounded by @oldsid.
815 * Otherwise, it returns error code.
816 *
817 * @oldsid : current security identifier
818 * @newsid : destinated security identifier
819 */
820int security_bounded_transition(u32 old_sid, u32 new_sid)
821{
822 struct context *old_context, *new_context;
823 struct type_datum *type;
824 int index;
Eric Paris4b02b522010-11-23 11:40:08 -0500825 int rc;
KaiGai Koheid9250de2008-08-28 16:35:57 +0900826
827 read_lock(&policy_rwlock);
828
Eric Paris4b02b522010-11-23 11:40:08 -0500829 rc = -EINVAL;
KaiGai Koheid9250de2008-08-28 16:35:57 +0900830 old_context = sidtab_search(&sidtab, old_sid);
831 if (!old_context) {
832 printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n",
833 __func__, old_sid);
834 goto out;
835 }
836
Eric Paris4b02b522010-11-23 11:40:08 -0500837 rc = -EINVAL;
KaiGai Koheid9250de2008-08-28 16:35:57 +0900838 new_context = sidtab_search(&sidtab, new_sid);
839 if (!new_context) {
840 printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n",
841 __func__, new_sid);
842 goto out;
843 }
844
Eric Paris4b02b522010-11-23 11:40:08 -0500845 rc = 0;
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200846 /* type/domain unchanged */
Eric Paris4b02b522010-11-23 11:40:08 -0500847 if (old_context->type == new_context->type)
KaiGai Koheid9250de2008-08-28 16:35:57 +0900848 goto out;
KaiGai Koheid9250de2008-08-28 16:35:57 +0900849
850 index = new_context->type;
851 while (true) {
Eric Paris23bdecb2010-11-29 15:47:09 -0500852 type = flex_array_get_ptr(policydb.type_val_to_struct_array,
853 index - 1);
KaiGai Koheid9250de2008-08-28 16:35:57 +0900854 BUG_ON(!type);
855
856 /* not bounded anymore */
Eric Paris4b02b522010-11-23 11:40:08 -0500857 rc = -EPERM;
858 if (!type->bounds)
KaiGai Koheid9250de2008-08-28 16:35:57 +0900859 break;
KaiGai Koheid9250de2008-08-28 16:35:57 +0900860
861 /* @newsid is bounded by @oldsid */
Eric Paris4b02b522010-11-23 11:40:08 -0500862 rc = 0;
863 if (type->bounds == old_context->type)
KaiGai Koheid9250de2008-08-28 16:35:57 +0900864 break;
Eric Paris4b02b522010-11-23 11:40:08 -0500865
KaiGai Koheid9250de2008-08-28 16:35:57 +0900866 index = type->bounds;
867 }
KaiGai Kohei44c2d9b2009-06-18 17:26:13 +0900868
869 if (rc) {
870 char *old_name = NULL;
871 char *new_name = NULL;
James Morris2da5d312010-02-16 17:29:06 +1100872 u32 length;
KaiGai Kohei44c2d9b2009-06-18 17:26:13 +0900873
874 if (!context_struct_to_string(old_context,
875 &old_name, &length) &&
876 !context_struct_to_string(new_context,
877 &new_name, &length)) {
878 audit_log(current->audit_context,
879 GFP_ATOMIC, AUDIT_SELINUX_ERR,
880 "op=security_bounded_transition "
881 "result=denied "
882 "oldcontext=%s newcontext=%s",
883 old_name, new_name);
884 }
885 kfree(new_name);
886 kfree(old_name);
887 }
KaiGai Koheid9250de2008-08-28 16:35:57 +0900888out:
889 read_unlock(&policy_rwlock);
890
891 return rc;
892}
893
Stephen Smalley19439d02010-01-14 17:28:10 -0500894static void avd_init(struct av_decision *avd)
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400895{
Stephen Smalley19439d02010-01-14 17:28:10 -0500896 avd->allowed = 0;
897 avd->auditallow = 0;
898 avd->auditdeny = 0xffffffff;
899 avd->seqno = latest_granting;
900 avd->flags = 0;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400901}
902
Stephen Smalley19439d02010-01-14 17:28:10 -0500903
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904/**
905 * security_compute_av - Compute access vector decisions.
906 * @ssid: source security identifier
907 * @tsid: target security identifier
908 * @tclass: target security class
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 * @avd: access vector decisions
910 *
911 * Compute a set of access vector decisions based on the
912 * SID pair (@ssid, @tsid) for the permissions in @tclass.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 */
Stephen Smalley19439d02010-01-14 17:28:10 -0500914void security_compute_av(u32 ssid,
915 u32 tsid,
916 u16 orig_tclass,
917 struct av_decision *avd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918{
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400919 u16 tclass;
Stephen Smalley19439d02010-01-14 17:28:10 -0500920 struct context *scontext = NULL, *tcontext = NULL;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400921
Stephen Smalleyb7f30082009-10-19 10:08:50 -0400922 read_lock(&policy_rwlock);
Stephen Smalley19439d02010-01-14 17:28:10 -0500923 avd_init(avd);
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400924 if (!ss_initialized)
925 goto allow;
926
Stephen Smalley19439d02010-01-14 17:28:10 -0500927 scontext = sidtab_search(&sidtab, ssid);
928 if (!scontext) {
929 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
930 __func__, ssid);
931 goto out;
932 }
933
934 /* permissive domain? */
935 if (ebitmap_get_bit(&policydb.permissive_map, scontext->type))
936 avd->flags |= AVD_FLAGS_PERMISSIVE;
937
938 tcontext = sidtab_search(&sidtab, tsid);
939 if (!tcontext) {
940 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
941 __func__, tsid);
942 goto out;
943 }
944
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400945 tclass = unmap_class(orig_tclass);
946 if (unlikely(orig_tclass && !tclass)) {
947 if (policydb.allow_unknown)
948 goto allow;
Stephen Smalleyb7f30082009-10-19 10:08:50 -0400949 goto out;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400950 }
Stephen Smalley19439d02010-01-14 17:28:10 -0500951 context_struct_compute_av(scontext, tcontext, tclass, avd);
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400952 map_decision(orig_tclass, avd, policydb.allow_unknown);
Stephen Smalleyb7f30082009-10-19 10:08:50 -0400953out:
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400954 read_unlock(&policy_rwlock);
Stephen Smalley19439d02010-01-14 17:28:10 -0500955 return;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400956allow:
957 avd->allowed = 0xffffffff;
Stephen Smalleyb7f30082009-10-19 10:08:50 -0400958 goto out;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400959}
960
Stephen Smalley19439d02010-01-14 17:28:10 -0500961void security_compute_av_user(u32 ssid,
962 u32 tsid,
963 u16 tclass,
964 struct av_decision *avd)
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400965{
Stephen Smalley19439d02010-01-14 17:28:10 -0500966 struct context *scontext = NULL, *tcontext = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967
James Morris0804d112008-06-06 18:40:29 +1000968 read_lock(&policy_rwlock);
Stephen Smalley19439d02010-01-14 17:28:10 -0500969 avd_init(avd);
970 if (!ss_initialized)
971 goto allow;
972
973 scontext = sidtab_search(&sidtab, ssid);
974 if (!scontext) {
975 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
976 __func__, ssid);
977 goto out;
978 }
979
980 /* permissive domain? */
981 if (ebitmap_get_bit(&policydb.permissive_map, scontext->type))
982 avd->flags |= AVD_FLAGS_PERMISSIVE;
983
984 tcontext = sidtab_search(&sidtab, tsid);
985 if (!tcontext) {
986 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
987 __func__, tsid);
988 goto out;
989 }
990
991 if (unlikely(!tclass)) {
992 if (policydb.allow_unknown)
993 goto allow;
994 goto out;
995 }
996
997 context_struct_compute_av(scontext, tcontext, tclass, avd);
998 out:
James Morris0804d112008-06-06 18:40:29 +1000999 read_unlock(&policy_rwlock);
Stephen Smalley19439d02010-01-14 17:28:10 -05001000 return;
1001allow:
1002 avd->allowed = 0xffffffff;
1003 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004}
1005
1006/*
1007 * Write the security context string representation of
1008 * the context structure `context' into a dynamically
1009 * allocated string of the correct size. Set `*scontext'
1010 * to point to this string and set `*scontext_len' to
1011 * the length of the string.
1012 */
1013static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len)
1014{
1015 char *scontextp;
1016
Eric Parisd5630b92010-10-13 16:24:48 -04001017 if (scontext)
1018 *scontext = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 *scontext_len = 0;
1020
Stephen Smalley12b29f32008-05-07 13:03:20 -04001021 if (context->len) {
1022 *scontext_len = context->len;
1023 *scontext = kstrdup(context->str, GFP_ATOMIC);
1024 if (!(*scontext))
1025 return -ENOMEM;
1026 return 0;
1027 }
1028
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 /* Compute the size of the context. */
Eric Parisac76c052010-11-29 15:47:09 -05001030 *scontext_len += strlen(sym_name(&policydb, SYM_USERS, context->user - 1)) + 1;
1031 *scontext_len += strlen(sym_name(&policydb, SYM_ROLES, context->role - 1)) + 1;
1032 *scontext_len += strlen(sym_name(&policydb, SYM_TYPES, context->type - 1)) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 *scontext_len += mls_compute_context_len(context);
1034
Eric Parisd5630b92010-10-13 16:24:48 -04001035 if (!scontext)
1036 return 0;
1037
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 /* Allocate space for the context; caller must free this space. */
1039 scontextp = kmalloc(*scontext_len, GFP_ATOMIC);
Eric Paris5d55a342008-04-18 17:38:33 -04001040 if (!scontextp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 *scontext = scontextp;
1043
1044 /*
1045 * Copy the user name, role name and type name into the context.
1046 */
1047 sprintf(scontextp, "%s:%s:%s",
Eric Parisac76c052010-11-29 15:47:09 -05001048 sym_name(&policydb, SYM_USERS, context->user - 1),
1049 sym_name(&policydb, SYM_ROLES, context->role - 1),
1050 sym_name(&policydb, SYM_TYPES, context->type - 1));
1051 scontextp += strlen(sym_name(&policydb, SYM_USERS, context->user - 1)) +
1052 1 + strlen(sym_name(&policydb, SYM_ROLES, context->role - 1)) +
1053 1 + strlen(sym_name(&policydb, SYM_TYPES, context->type - 1));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054
1055 mls_sid_to_context(context, &scontextp);
1056
1057 *scontextp = 0;
1058
1059 return 0;
1060}
1061
1062#include "initial_sid_to_string.h"
1063
James Carterf0ee2e42007-04-04 10:11:29 -04001064const char *security_get_initial_sid_context(u32 sid)
1065{
1066 if (unlikely(sid > SECINITSID_NUM))
1067 return NULL;
1068 return initial_sid_to_string[sid];
1069}
1070
Stephen Smalley12b29f32008-05-07 13:03:20 -04001071static int security_sid_to_context_core(u32 sid, char **scontext,
1072 u32 *scontext_len, int force)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073{
1074 struct context *context;
1075 int rc = 0;
1076
Eric Parisd5630b92010-10-13 16:24:48 -04001077 if (scontext)
1078 *scontext = NULL;
Stephen Smalley4f4acf32007-02-26 12:02:34 -05001079 *scontext_len = 0;
1080
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 if (!ss_initialized) {
1082 if (sid <= SECINITSID_NUM) {
1083 char *scontextp;
1084
1085 *scontext_len = strlen(initial_sid_to_string[sid]) + 1;
Eric Parisd5630b92010-10-13 16:24:48 -04001086 if (!scontext)
1087 goto out;
Eric Paris5d55a342008-04-18 17:38:33 -04001088 scontextp = kmalloc(*scontext_len, GFP_ATOMIC);
Serge E. Hallyn0cccca02006-05-15 09:43:48 -07001089 if (!scontextp) {
1090 rc = -ENOMEM;
1091 goto out;
1092 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 strcpy(scontextp, initial_sid_to_string[sid]);
1094 *scontext = scontextp;
1095 goto out;
1096 }
Eric Paris744ba352008-04-17 11:52:44 -04001097 printk(KERN_ERR "SELinux: %s: called before initial "
1098 "load_policy on unknown SID %d\n", __func__, sid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 rc = -EINVAL;
1100 goto out;
1101 }
James Morris0804d112008-06-06 18:40:29 +10001102 read_lock(&policy_rwlock);
Stephen Smalley12b29f32008-05-07 13:03:20 -04001103 if (force)
1104 context = sidtab_search_force(&sidtab, sid);
1105 else
1106 context = sidtab_search(&sidtab, sid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 if (!context) {
Eric Paris744ba352008-04-17 11:52:44 -04001108 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
1109 __func__, sid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 rc = -EINVAL;
1111 goto out_unlock;
1112 }
1113 rc = context_struct_to_string(context, scontext, scontext_len);
1114out_unlock:
James Morris0804d112008-06-06 18:40:29 +10001115 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116out:
1117 return rc;
1118
1119}
1120
Stephen Smalley12b29f32008-05-07 13:03:20 -04001121/**
1122 * security_sid_to_context - Obtain a context for a given SID.
1123 * @sid: security identifier, SID
1124 * @scontext: security context
1125 * @scontext_len: length in bytes
1126 *
1127 * Write the string representation of the context associated with @sid
1128 * into a dynamically allocated string of the correct size. Set @scontext
1129 * to point to this string and set @scontext_len to the length of the string.
1130 */
1131int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132{
Stephen Smalley12b29f32008-05-07 13:03:20 -04001133 return security_sid_to_context_core(sid, scontext, scontext_len, 0);
1134}
1135
1136int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len)
1137{
1138 return security_sid_to_context_core(sid, scontext, scontext_len, 1);
1139}
1140
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001141/*
1142 * Caveat: Mutates scontext.
1143 */
Stephen Smalley12b29f32008-05-07 13:03:20 -04001144static int string_to_context_struct(struct policydb *pol,
1145 struct sidtab *sidtabp,
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001146 char *scontext,
Stephen Smalley12b29f32008-05-07 13:03:20 -04001147 u32 scontext_len,
1148 struct context *ctx,
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001149 u32 def_sid)
Stephen Smalley12b29f32008-05-07 13:03:20 -04001150{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 struct role_datum *role;
1152 struct type_datum *typdatum;
1153 struct user_datum *usrdatum;
1154 char *scontextp, *p, oldc;
1155 int rc = 0;
1156
Stephen Smalley12b29f32008-05-07 13:03:20 -04001157 context_init(ctx);
1158
Stephen Smalley12b29f32008-05-07 13:03:20 -04001159 /* Parse the security context. */
1160
1161 rc = -EINVAL;
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001162 scontextp = (char *) scontext;
Stephen Smalley12b29f32008-05-07 13:03:20 -04001163
1164 /* Extract the user. */
1165 p = scontextp;
1166 while (*p && *p != ':')
1167 p++;
1168
1169 if (*p == 0)
1170 goto out;
1171
1172 *p++ = 0;
1173
1174 usrdatum = hashtab_search(pol->p_users.table, scontextp);
1175 if (!usrdatum)
1176 goto out;
1177
1178 ctx->user = usrdatum->value;
1179
1180 /* Extract role. */
1181 scontextp = p;
1182 while (*p && *p != ':')
1183 p++;
1184
1185 if (*p == 0)
1186 goto out;
1187
1188 *p++ = 0;
1189
1190 role = hashtab_search(pol->p_roles.table, scontextp);
1191 if (!role)
1192 goto out;
1193 ctx->role = role->value;
1194
1195 /* Extract type. */
1196 scontextp = p;
1197 while (*p && *p != ':')
1198 p++;
1199 oldc = *p;
1200 *p++ = 0;
1201
1202 typdatum = hashtab_search(pol->p_types.table, scontextp);
KaiGai Koheid9250de2008-08-28 16:35:57 +09001203 if (!typdatum || typdatum->attribute)
Stephen Smalley12b29f32008-05-07 13:03:20 -04001204 goto out;
1205
1206 ctx->type = typdatum->value;
1207
1208 rc = mls_context_to_sid(pol, oldc, &p, ctx, sidtabp, def_sid);
1209 if (rc)
1210 goto out;
1211
Eric Paris4b02b522010-11-23 11:40:08 -05001212 rc = -EINVAL;
1213 if ((p - scontext) < scontext_len)
Stephen Smalley12b29f32008-05-07 13:03:20 -04001214 goto out;
Stephen Smalley12b29f32008-05-07 13:03:20 -04001215
1216 /* Check the validity of the new context. */
Eric Paris4b02b522010-11-23 11:40:08 -05001217 if (!policydb_context_isvalid(pol, ctx))
Stephen Smalley12b29f32008-05-07 13:03:20 -04001218 goto out;
Stephen Smalley12b29f32008-05-07 13:03:20 -04001219 rc = 0;
1220out:
Eric Paris8e531af2008-09-03 11:49:47 -04001221 if (rc)
1222 context_destroy(ctx);
Stephen Smalley12b29f32008-05-07 13:03:20 -04001223 return rc;
1224}
1225
1226static int security_context_to_sid_core(const char *scontext, u32 scontext_len,
1227 u32 *sid, u32 def_sid, gfp_t gfp_flags,
1228 int force)
1229{
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001230 char *scontext2, *str = NULL;
Stephen Smalley12b29f32008-05-07 13:03:20 -04001231 struct context context;
1232 int rc = 0;
1233
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 if (!ss_initialized) {
1235 int i;
1236
1237 for (i = 1; i < SECINITSID_NUM; i++) {
1238 if (!strcmp(initial_sid_to_string[i], scontext)) {
1239 *sid = i;
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001240 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 }
1242 }
1243 *sid = SECINITSID_KERNEL;
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001244 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 }
1246 *sid = SECSID_NULL;
1247
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001248 /* Copy the string so that we can modify the copy as we parse it. */
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08001249 scontext2 = kmalloc(scontext_len + 1, gfp_flags);
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001250 if (!scontext2)
1251 return -ENOMEM;
1252 memcpy(scontext2, scontext, scontext_len);
1253 scontext2[scontext_len] = 0;
1254
1255 if (force) {
1256 /* Save another copy for storing in uninterpreted form */
Eric Paris4b02b522010-11-23 11:40:08 -05001257 rc = -ENOMEM;
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001258 str = kstrdup(scontext2, gfp_flags);
Eric Paris4b02b522010-11-23 11:40:08 -05001259 if (!str)
1260 goto out;
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001261 }
1262
James Morris0804d112008-06-06 18:40:29 +10001263 read_lock(&policy_rwlock);
Eric Paris4b02b522010-11-23 11:40:08 -05001264 rc = string_to_context_struct(&policydb, &sidtab, scontext2,
1265 scontext_len, &context, def_sid);
Stephen Smalley12b29f32008-05-07 13:03:20 -04001266 if (rc == -EINVAL && force) {
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001267 context.str = str;
Stephen Smalley12b29f32008-05-07 13:03:20 -04001268 context.len = scontext_len;
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001269 str = NULL;
Stephen Smalley12b29f32008-05-07 13:03:20 -04001270 } else if (rc)
Eric Paris4b02b522010-11-23 11:40:08 -05001271 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 rc = sidtab_context_to_sid(&sidtab, &context, sid);
Eric Paris8e531af2008-09-03 11:49:47 -04001273 context_destroy(&context);
Eric Paris4b02b522010-11-23 11:40:08 -05001274out_unlock:
James Morris0804d112008-06-06 18:40:29 +10001275 read_unlock(&policy_rwlock);
Eric Paris4b02b522010-11-23 11:40:08 -05001276out:
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001277 kfree(scontext2);
1278 kfree(str);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 return rc;
1280}
1281
James Morrisf5c1d5b2005-07-28 01:07:37 -07001282/**
1283 * security_context_to_sid - Obtain a SID for a given security context.
1284 * @scontext: security context
1285 * @scontext_len: length in bytes
1286 * @sid: security identifier, SID
1287 *
1288 * Obtains a SID associated with the security context that
1289 * has the string representation specified by @scontext.
1290 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
1291 * memory is available, or 0 on success.
1292 */
David Howells8f0cfa52008-04-29 00:59:41 -07001293int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid)
James Morrisf5c1d5b2005-07-28 01:07:37 -07001294{
1295 return security_context_to_sid_core(scontext, scontext_len,
Stephen Smalley12b29f32008-05-07 13:03:20 -04001296 sid, SECSID_NULL, GFP_KERNEL, 0);
James Morrisf5c1d5b2005-07-28 01:07:37 -07001297}
1298
1299/**
1300 * security_context_to_sid_default - Obtain a SID for a given security context,
1301 * falling back to specified default if needed.
1302 *
1303 * @scontext: security context
1304 * @scontext_len: length in bytes
1305 * @sid: security identifier, SID
Gabriel Craciunescud133a962007-07-31 00:39:19 -07001306 * @def_sid: default SID to assign on error
James Morrisf5c1d5b2005-07-28 01:07:37 -07001307 *
1308 * Obtains a SID associated with the security context that
1309 * has the string representation specified by @scontext.
1310 * The default SID is passed to the MLS layer to be used to allow
1311 * kernel labeling of the MLS field if the MLS field is not present
1312 * (for upgrading to MLS without full relabel).
Stephen Smalley12b29f32008-05-07 13:03:20 -04001313 * Implicitly forces adding of the context even if it cannot be mapped yet.
James Morrisf5c1d5b2005-07-28 01:07:37 -07001314 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
1315 * memory is available, or 0 on success.
1316 */
David Howells7bf570d2008-04-29 20:52:51 +01001317int security_context_to_sid_default(const char *scontext, u32 scontext_len,
1318 u32 *sid, u32 def_sid, gfp_t gfp_flags)
James Morrisf5c1d5b2005-07-28 01:07:37 -07001319{
1320 return security_context_to_sid_core(scontext, scontext_len,
Stephen Smalley12b29f32008-05-07 13:03:20 -04001321 sid, def_sid, gfp_flags, 1);
1322}
1323
1324int security_context_to_sid_force(const char *scontext, u32 scontext_len,
1325 u32 *sid)
1326{
1327 return security_context_to_sid_core(scontext, scontext_len,
1328 sid, SECSID_NULL, GFP_KERNEL, 1);
James Morrisf5c1d5b2005-07-28 01:07:37 -07001329}
1330
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331static int compute_sid_handle_invalid_context(
1332 struct context *scontext,
1333 struct context *tcontext,
1334 u16 tclass,
1335 struct context *newcontext)
1336{
1337 char *s = NULL, *t = NULL, *n = NULL;
1338 u32 slen, tlen, nlen;
1339
Eric Paris4b02b522010-11-23 11:40:08 -05001340 if (context_struct_to_string(scontext, &s, &slen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 goto out;
Eric Paris4b02b522010-11-23 11:40:08 -05001342 if (context_struct_to_string(tcontext, &t, &tlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 goto out;
Eric Paris4b02b522010-11-23 11:40:08 -05001344 if (context_struct_to_string(newcontext, &n, &nlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 goto out;
David Woodhouse9ad9ad32005-06-22 15:04:33 +01001346 audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 "security_compute_sid: invalid context %s"
1348 " for scontext=%s"
1349 " tcontext=%s"
1350 " tclass=%s",
Eric Parisac76c052010-11-29 15:47:09 -05001351 n, s, t, sym_name(&policydb, SYM_CLASSES, tclass-1));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352out:
1353 kfree(s);
1354 kfree(t);
1355 kfree(n);
1356 if (!selinux_enforcing)
1357 return 0;
1358 return -EACCES;
1359}
1360
Eric Paris652bb9b2011-02-01 11:05:40 -05001361static void filename_compute_type(struct policydb *p, struct context *newcontext,
1362 u32 scon, u32 tcon, u16 tclass,
1363 const struct qstr *qstr)
1364{
1365 struct filename_trans *ft;
1366 for (ft = p->filename_trans; ft; ft = ft->next) {
1367 if (ft->stype == scon &&
1368 ft->ttype == tcon &&
1369 ft->tclass == tclass &&
1370 !strcmp(ft->name, qstr->name)) {
1371 newcontext->type = ft->otype;
1372 return;
1373 }
1374 }
1375}
1376
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377static int security_compute_sid(u32 ssid,
1378 u32 tsid,
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001379 u16 orig_tclass,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 u32 specified,
Eric Paris652bb9b2011-02-01 11:05:40 -05001381 const struct qstr *qstr,
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001382 u32 *out_sid,
1383 bool kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384{
1385 struct context *scontext = NULL, *tcontext = NULL, newcontext;
1386 struct role_trans *roletr = NULL;
1387 struct avtab_key avkey;
1388 struct avtab_datum *avdatum;
1389 struct avtab_node *node;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001390 u16 tclass;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 int rc = 0;
Harry Ciao6f5317e2011-03-02 13:32:33 +08001392 bool sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393
1394 if (!ss_initialized) {
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001395 switch (orig_tclass) {
1396 case SECCLASS_PROCESS: /* kernel value */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397 *out_sid = ssid;
1398 break;
1399 default:
1400 *out_sid = tsid;
1401 break;
1402 }
1403 goto out;
1404 }
1405
Venkat Yekkirala851f8a62006-07-30 03:03:18 -07001406 context_init(&newcontext);
1407
James Morris0804d112008-06-06 18:40:29 +10001408 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409
Harry Ciao6f5317e2011-03-02 13:32:33 +08001410 if (kern) {
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001411 tclass = unmap_class(orig_tclass);
Harry Ciao6f5317e2011-03-02 13:32:33 +08001412 sock = security_is_socket_class(orig_tclass);
1413 } else {
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001414 tclass = orig_tclass;
Harry Ciao6f5317e2011-03-02 13:32:33 +08001415 sock = security_is_socket_class(map_class(tclass));
1416 }
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001417
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 scontext = sidtab_search(&sidtab, ssid);
1419 if (!scontext) {
Eric Paris744ba352008-04-17 11:52:44 -04001420 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
1421 __func__, ssid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 rc = -EINVAL;
1423 goto out_unlock;
1424 }
1425 tcontext = sidtab_search(&sidtab, tsid);
1426 if (!tcontext) {
Eric Paris744ba352008-04-17 11:52:44 -04001427 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
1428 __func__, tsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 rc = -EINVAL;
1430 goto out_unlock;
1431 }
1432
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 /* Set the user identity. */
1434 switch (specified) {
1435 case AVTAB_TRANSITION:
1436 case AVTAB_CHANGE:
1437 /* Use the process user identity. */
1438 newcontext.user = scontext->user;
1439 break;
1440 case AVTAB_MEMBER:
1441 /* Use the related object owner. */
1442 newcontext.user = tcontext->user;
1443 break;
1444 }
1445
1446 /* Set the role and type to default values. */
Harry Ciao6f5317e2011-03-02 13:32:33 +08001447 if ((tclass == policydb.process_class) || (sock == true)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448 /* Use the current role and type of process. */
1449 newcontext.role = scontext->role;
1450 newcontext.type = scontext->type;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001451 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 /* Use the well-defined object role. */
1453 newcontext.role = OBJECT_R_VAL;
1454 /* Use the type of the related object. */
1455 newcontext.type = tcontext->type;
1456 }
1457
1458 /* Look for a type transition/member/change rule. */
1459 avkey.source_type = scontext->type;
1460 avkey.target_type = tcontext->type;
1461 avkey.target_class = tclass;
Stephen Smalley782ebb92005-09-03 15:55:16 -07001462 avkey.specified = specified;
1463 avdatum = avtab_search(&policydb.te_avtab, &avkey);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464
1465 /* If no permanent rule, also check for enabled conditional rules */
Eric Paris5d55a342008-04-18 17:38:33 -04001466 if (!avdatum) {
Stephen Smalley782ebb92005-09-03 15:55:16 -07001467 node = avtab_search_node(&policydb.te_cond_avtab, &avkey);
Vesa-Matti Karidbc74c62008-08-07 03:18:20 +03001468 for (; node; node = avtab_search_node_next(node, specified)) {
Stephen Smalley782ebb92005-09-03 15:55:16 -07001469 if (node->key.specified & AVTAB_ENABLED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470 avdatum = &node->datum;
1471 break;
1472 }
1473 }
1474 }
1475
Stephen Smalley782ebb92005-09-03 15:55:16 -07001476 if (avdatum) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477 /* Use the type from the type transition/member/change rule. */
Stephen Smalley782ebb92005-09-03 15:55:16 -07001478 newcontext.type = avdatum->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479 }
1480
Eric Paris652bb9b2011-02-01 11:05:40 -05001481 /* if we have a qstr this is a file trans check so check those rules */
1482 if (qstr)
1483 filename_compute_type(&policydb, &newcontext, scontext->type,
1484 tcontext->type, tclass, qstr);
1485
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486 /* Check for class-specific changes. */
Harry Ciao63a312c2011-03-25 13:51:58 +08001487 if (specified & AVTAB_TRANSITION) {
1488 /* Look for a role transition rule. */
1489 for (roletr = policydb.role_tr; roletr; roletr = roletr->next) {
1490 if ((roletr->role == scontext->role) &&
1491 (roletr->type == tcontext->type) &&
1492 (roletr->tclass == tclass)) {
1493 /* Use the role transition rule. */
1494 newcontext.role = roletr->new_role;
1495 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496 }
1497 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 }
1499
1500 /* Set the MLS attributes.
1501 This is done last because it may allocate memory. */
Harry Ciao6f5317e2011-03-02 13:32:33 +08001502 rc = mls_compute_sid(scontext, tcontext, tclass, specified,
1503 &newcontext, sock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 if (rc)
1505 goto out_unlock;
1506
1507 /* Check the validity of the context. */
1508 if (!policydb_context_isvalid(&policydb, &newcontext)) {
1509 rc = compute_sid_handle_invalid_context(scontext,
1510 tcontext,
1511 tclass,
1512 &newcontext);
1513 if (rc)
1514 goto out_unlock;
1515 }
1516 /* Obtain the sid for the context. */
1517 rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid);
1518out_unlock:
James Morris0804d112008-06-06 18:40:29 +10001519 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520 context_destroy(&newcontext);
1521out:
1522 return rc;
1523}
1524
1525/**
1526 * security_transition_sid - Compute the SID for a new subject/object.
1527 * @ssid: source security identifier
1528 * @tsid: target security identifier
1529 * @tclass: target security class
1530 * @out_sid: security identifier for new subject/object
1531 *
1532 * Compute a SID to use for labeling a new subject or object in the
1533 * class @tclass based on a SID pair (@ssid, @tsid).
1534 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1535 * if insufficient memory is available, or %0 if the new SID was
1536 * computed successfully.
1537 */
Eric Paris652bb9b2011-02-01 11:05:40 -05001538int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
1539 const struct qstr *qstr, u32 *out_sid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540{
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001541 return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION,
Eric Paris652bb9b2011-02-01 11:05:40 -05001542 qstr, out_sid, true);
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001543}
1544
Eric Paris652bb9b2011-02-01 11:05:40 -05001545int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid)
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001546{
1547 return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION,
Eric Paris652bb9b2011-02-01 11:05:40 -05001548 NULL, out_sid, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549}
1550
1551/**
1552 * security_member_sid - Compute the SID for member selection.
1553 * @ssid: source security identifier
1554 * @tsid: target security identifier
1555 * @tclass: target security class
1556 * @out_sid: security identifier for selected member
1557 *
1558 * Compute a SID to use when selecting a member of a polyinstantiated
1559 * object of class @tclass based on a SID pair (@ssid, @tsid).
1560 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1561 * if insufficient memory is available, or %0 if the SID was
1562 * computed successfully.
1563 */
1564int security_member_sid(u32 ssid,
1565 u32 tsid,
1566 u16 tclass,
1567 u32 *out_sid)
1568{
Eric Paris652bb9b2011-02-01 11:05:40 -05001569 return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, NULL,
1570 out_sid, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571}
1572
1573/**
1574 * security_change_sid - Compute the SID for object relabeling.
1575 * @ssid: source security identifier
1576 * @tsid: target security identifier
1577 * @tclass: target security class
1578 * @out_sid: security identifier for selected member
1579 *
1580 * Compute a SID to use for relabeling an object of class @tclass
1581 * based on a SID pair (@ssid, @tsid).
1582 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1583 * if insufficient memory is available, or %0 if the SID was
1584 * computed successfully.
1585 */
1586int security_change_sid(u32 ssid,
1587 u32 tsid,
1588 u16 tclass,
1589 u32 *out_sid)
1590{
Eric Paris652bb9b2011-02-01 11:05:40 -05001591 return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, NULL,
1592 out_sid, false);
Chad Sellersb94c7e62006-11-06 12:38:18 -05001593}
1594
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595/* Clone the SID into the new SID table. */
1596static int clone_sid(u32 sid,
1597 struct context *context,
1598 void *arg)
1599{
1600 struct sidtab *s = arg;
1601
Guido Trentalancia42596ea2010-02-03 17:06:01 +01001602 if (sid > SECINITSID_NUM)
1603 return sidtab_insert(s, sid, context);
1604 else
1605 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606}
1607
1608static inline int convert_context_handle_invalid_context(struct context *context)
1609{
Eric Paris4b02b522010-11-23 11:40:08 -05001610 char *s;
1611 u32 len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612
Eric Paris4b02b522010-11-23 11:40:08 -05001613 if (selinux_enforcing)
1614 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615
Eric Paris4b02b522010-11-23 11:40:08 -05001616 if (!context_struct_to_string(context, &s, &len)) {
1617 printk(KERN_WARNING "SELinux: Context %s would be invalid if enforcing\n", s);
1618 kfree(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619 }
Eric Paris4b02b522010-11-23 11:40:08 -05001620 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621}
1622
1623struct convert_context_args {
1624 struct policydb *oldp;
1625 struct policydb *newp;
1626};
1627
1628/*
1629 * Convert the values in the security context
1630 * structure `c' from the values specified
1631 * in the policy `p->oldp' to the values specified
1632 * in the policy `p->newp'. Verify that the
1633 * context is valid under the new policy.
1634 */
1635static int convert_context(u32 key,
1636 struct context *c,
1637 void *p)
1638{
1639 struct convert_context_args *args;
1640 struct context oldc;
Guido Trentalancia0719aaf2010-02-03 16:40:20 +01001641 struct ocontext *oc;
1642 struct mls_range *range;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 struct role_datum *role;
1644 struct type_datum *typdatum;
1645 struct user_datum *usrdatum;
1646 char *s;
1647 u32 len;
Guido Trentalancia42596ea2010-02-03 17:06:01 +01001648 int rc = 0;
1649
1650 if (key <= SECINITSID_NUM)
1651 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652
1653 args = p;
1654
Stephen Smalley12b29f32008-05-07 13:03:20 -04001655 if (c->str) {
1656 struct context ctx;
Eric Paris4b02b522010-11-23 11:40:08 -05001657
1658 rc = -ENOMEM;
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001659 s = kstrdup(c->str, GFP_KERNEL);
Eric Paris4b02b522010-11-23 11:40:08 -05001660 if (!s)
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001661 goto out;
Eric Paris4b02b522010-11-23 11:40:08 -05001662
Stephen Smalley9a59daa2008-05-14 10:33:55 -04001663 rc = string_to_context_struct(args->newp, NULL, s,
1664 c->len, &ctx, SECSID_NULL);
1665 kfree(s);
Stephen Smalley12b29f32008-05-07 13:03:20 -04001666 if (!rc) {
Eric Paris4b02b522010-11-23 11:40:08 -05001667 printk(KERN_INFO "SELinux: Context %s became valid (mapped).\n",
Stephen Smalley12b29f32008-05-07 13:03:20 -04001668 c->str);
1669 /* Replace string with mapped representation. */
1670 kfree(c->str);
1671 memcpy(c, &ctx, sizeof(*c));
1672 goto out;
1673 } else if (rc == -EINVAL) {
1674 /* Retain string representation for later mapping. */
1675 rc = 0;
1676 goto out;
1677 } else {
1678 /* Other error condition, e.g. ENOMEM. */
Eric Paris4b02b522010-11-23 11:40:08 -05001679 printk(KERN_ERR "SELinux: Unable to map context %s, rc = %d.\n",
Stephen Smalley12b29f32008-05-07 13:03:20 -04001680 c->str, -rc);
1681 goto out;
1682 }
1683 }
1684
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685 rc = context_cpy(&oldc, c);
1686 if (rc)
1687 goto out;
1688
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689 /* Convert the user. */
Eric Paris4b02b522010-11-23 11:40:08 -05001690 rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 usrdatum = hashtab_search(args->newp->p_users.table,
Eric Parisac76c052010-11-29 15:47:09 -05001692 sym_name(args->oldp, SYM_USERS, c->user - 1));
Eric Paris5d55a342008-04-18 17:38:33 -04001693 if (!usrdatum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695 c->user = usrdatum->value;
1696
1697 /* Convert the role. */
Eric Paris4b02b522010-11-23 11:40:08 -05001698 rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699 role = hashtab_search(args->newp->p_roles.table,
Eric Parisac76c052010-11-29 15:47:09 -05001700 sym_name(args->oldp, SYM_ROLES, c->role - 1));
Eric Paris5d55a342008-04-18 17:38:33 -04001701 if (!role)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703 c->role = role->value;
1704
1705 /* Convert the type. */
Eric Paris4b02b522010-11-23 11:40:08 -05001706 rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001707 typdatum = hashtab_search(args->newp->p_types.table,
Eric Parisac76c052010-11-29 15:47:09 -05001708 sym_name(args->oldp, SYM_TYPES, c->type - 1));
Eric Paris5d55a342008-04-18 17:38:33 -04001709 if (!typdatum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711 c->type = typdatum->value;
1712
Guido Trentalancia0719aaf2010-02-03 16:40:20 +01001713 /* Convert the MLS fields if dealing with MLS policies */
1714 if (args->oldp->mls_enabled && args->newp->mls_enabled) {
1715 rc = mls_convert_context(args->oldp, args->newp, c);
1716 if (rc)
1717 goto bad;
1718 } else if (args->oldp->mls_enabled && !args->newp->mls_enabled) {
1719 /*
1720 * Switching between MLS and non-MLS policy:
1721 * free any storage used by the MLS fields in the
1722 * context for all existing entries in the sidtab.
1723 */
1724 mls_context_destroy(c);
1725 } else if (!args->oldp->mls_enabled && args->newp->mls_enabled) {
1726 /*
1727 * Switching between non-MLS and MLS policy:
1728 * ensure that the MLS fields of the context for all
1729 * existing entries in the sidtab are filled in with a
1730 * suitable default value, likely taken from one of the
1731 * initial SIDs.
1732 */
1733 oc = args->newp->ocontexts[OCON_ISID];
1734 while (oc && oc->sid[0] != SECINITSID_UNLABELED)
1735 oc = oc->next;
Eric Paris4b02b522010-11-23 11:40:08 -05001736 rc = -EINVAL;
Guido Trentalancia0719aaf2010-02-03 16:40:20 +01001737 if (!oc) {
1738 printk(KERN_ERR "SELinux: unable to look up"
1739 " the initial SIDs list\n");
1740 goto bad;
1741 }
1742 range = &oc->context[0].range;
1743 rc = mls_range_set(c, range);
1744 if (rc)
1745 goto bad;
1746 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747
1748 /* Check the validity of the new context. */
1749 if (!policydb_context_isvalid(args->newp, c)) {
1750 rc = convert_context_handle_invalid_context(&oldc);
1751 if (rc)
1752 goto bad;
1753 }
1754
1755 context_destroy(&oldc);
Eric Paris4b02b522010-11-23 11:40:08 -05001756
Stephen Smalley12b29f32008-05-07 13:03:20 -04001757 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758out:
1759 return rc;
1760bad:
Stephen Smalley12b29f32008-05-07 13:03:20 -04001761 /* Map old representation to string and save it. */
Eric Paris4b02b522010-11-23 11:40:08 -05001762 rc = context_struct_to_string(&oldc, &s, &len);
1763 if (rc)
1764 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765 context_destroy(&oldc);
Stephen Smalley12b29f32008-05-07 13:03:20 -04001766 context_destroy(c);
1767 c->str = s;
1768 c->len = len;
Eric Paris4b02b522010-11-23 11:40:08 -05001769 printk(KERN_INFO "SELinux: Context %s became invalid (unmapped).\n",
Stephen Smalley12b29f32008-05-07 13:03:20 -04001770 c->str);
1771 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772 goto out;
1773}
1774
Paul Moore3bb56b22008-01-29 08:38:19 -05001775static void security_load_policycaps(void)
1776{
1777 selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps,
1778 POLICYDB_CAPABILITY_NETPEER);
Eric Parisb0c636b2008-02-28 12:58:40 -05001779 selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps,
1780 POLICYDB_CAPABILITY_OPENPERM);
Paul Moore3bb56b22008-01-29 08:38:19 -05001781}
1782
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783extern void selinux_complete_init(void);
Stephen Smalleye900a7d2007-04-19 14:16:19 -04001784static int security_preserve_bools(struct policydb *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785
1786/**
1787 * security_load_policy - Load a security policy configuration.
1788 * @data: binary policy data
1789 * @len: length of data in bytes
1790 *
1791 * Load a new set of security policy configuration data,
1792 * validate it and convert the SID table as necessary.
1793 * This function will flush the access vector cache after
1794 * loading the new policy.
1795 */
1796int security_load_policy(void *data, size_t len)
1797{
1798 struct policydb oldpolicydb, newpolicydb;
1799 struct sidtab oldsidtab, newsidtab;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001800 struct selinux_mapping *oldmap, *map = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001801 struct convert_context_args args;
1802 u32 seqno;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001803 u16 map_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 int rc = 0;
1805 struct policy_file file = { data, len }, *fp = &file;
1806
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807 if (!ss_initialized) {
1808 avtab_cache_init();
Eric Parisa2000052010-04-20 10:29:42 -04001809 rc = policydb_read(&policydb, fp);
1810 if (rc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811 avtab_cache_destroy();
Eric Parisa2000052010-04-20 10:29:42 -04001812 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813 }
Eric Parisa2000052010-04-20 10:29:42 -04001814
Eric Pariscee74f42010-10-13 17:50:25 -04001815 policydb.len = len;
Eric Parisa2000052010-04-20 10:29:42 -04001816 rc = selinux_set_mapping(&policydb, secclass_map,
1817 &current_mapping,
1818 &current_mapping_size);
1819 if (rc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001820 policydb_destroy(&policydb);
1821 avtab_cache_destroy();
Eric Parisa2000052010-04-20 10:29:42 -04001822 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823 }
Eric Parisa2000052010-04-20 10:29:42 -04001824
1825 rc = policydb_load_isids(&policydb, &sidtab);
1826 if (rc) {
Chad Sellersb94c7e62006-11-06 12:38:18 -05001827 policydb_destroy(&policydb);
1828 avtab_cache_destroy();
Eric Parisa2000052010-04-20 10:29:42 -04001829 return rc;
Chad Sellersb94c7e62006-11-06 12:38:18 -05001830 }
Eric Parisa2000052010-04-20 10:29:42 -04001831
Paul Moore3bb56b22008-01-29 08:38:19 -05001832 security_load_policycaps();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 ss_initialized = 1;
Stephen Smalley4c443d12005-05-16 21:53:52 -07001834 seqno = ++latest_granting;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001835 selinux_complete_init();
Stephen Smalley4c443d12005-05-16 21:53:52 -07001836 avc_ss_reset(seqno);
1837 selnl_notify_policyload(seqno);
KaiGai Kohei11904162010-09-14 18:28:39 +09001838 selinux_status_update_policyload(seqno);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001839 selinux_netlbl_cache_invalidate();
Venkat Yekkirala342a0cf2007-01-26 19:03:48 -08001840 selinux_xfrm_notify_policyload();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841 return 0;
1842 }
1843
1844#if 0
1845 sidtab_hash_eval(&sidtab, "sids");
1846#endif
1847
Eric Parisa2000052010-04-20 10:29:42 -04001848 rc = policydb_read(&newpolicydb, fp);
1849 if (rc)
1850 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851
Eric Pariscee74f42010-10-13 17:50:25 -04001852 newpolicydb.len = len;
Guido Trentalancia0719aaf2010-02-03 16:40:20 +01001853 /* If switching between different policy types, log MLS status */
1854 if (policydb.mls_enabled && !newpolicydb.mls_enabled)
1855 printk(KERN_INFO "SELinux: Disabling MLS support...\n");
1856 else if (!policydb.mls_enabled && newpolicydb.mls_enabled)
1857 printk(KERN_INFO "SELinux: Enabling MLS support...\n");
1858
Guido Trentalancia42596ea2010-02-03 17:06:01 +01001859 rc = policydb_load_isids(&newpolicydb, &newsidtab);
1860 if (rc) {
1861 printk(KERN_ERR "SELinux: unable to load the initial SIDs\n");
Stephen Smalley12b29f32008-05-07 13:03:20 -04001862 policydb_destroy(&newpolicydb);
Guido Trentalancia42596ea2010-02-03 17:06:01 +01001863 return rc;
Stephen Smalley12b29f32008-05-07 13:03:20 -04001864 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865
Eric Parisa2000052010-04-20 10:29:42 -04001866 rc = selinux_set_mapping(&newpolicydb, secclass_map, &map, &map_size);
1867 if (rc)
Chad Sellersb94c7e62006-11-06 12:38:18 -05001868 goto err;
Chad Sellersb94c7e62006-11-06 12:38:18 -05001869
Stephen Smalleye900a7d2007-04-19 14:16:19 -04001870 rc = security_preserve_bools(&newpolicydb);
1871 if (rc) {
James Morris454d9722008-02-26 20:42:02 +11001872 printk(KERN_ERR "SELinux: unable to preserve booleans\n");
Stephen Smalleye900a7d2007-04-19 14:16:19 -04001873 goto err;
1874 }
1875
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876 /* Clone the SID table. */
1877 sidtab_shutdown(&sidtab);
Eric Parisa2000052010-04-20 10:29:42 -04001878
1879 rc = sidtab_map(&sidtab, clone_sid, &newsidtab);
1880 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882
Stephen Smalley12b29f32008-05-07 13:03:20 -04001883 /*
1884 * Convert the internal representations of contexts
1885 * in the new SID table.
1886 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 args.oldp = &policydb;
1888 args.newp = &newpolicydb;
Stephen Smalley12b29f32008-05-07 13:03:20 -04001889 rc = sidtab_map(&newsidtab, convert_context, &args);
Guido Trentalancia0719aaf2010-02-03 16:40:20 +01001890 if (rc) {
1891 printk(KERN_ERR "SELinux: unable to convert the internal"
1892 " representation of contexts in the new SID"
1893 " table\n");
Stephen Smalley12b29f32008-05-07 13:03:20 -04001894 goto err;
Guido Trentalancia0719aaf2010-02-03 16:40:20 +01001895 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896
1897 /* Save the old policydb and SID table to free later. */
1898 memcpy(&oldpolicydb, &policydb, sizeof policydb);
1899 sidtab_set(&oldsidtab, &sidtab);
1900
1901 /* Install the new policydb and SID table. */
James Morris0804d112008-06-06 18:40:29 +10001902 write_lock_irq(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001903 memcpy(&policydb, &newpolicydb, sizeof policydb);
1904 sidtab_set(&sidtab, &newsidtab);
Paul Moore3bb56b22008-01-29 08:38:19 -05001905 security_load_policycaps();
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001906 oldmap = current_mapping;
1907 current_mapping = map;
1908 current_mapping_size = map_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909 seqno = ++latest_granting;
James Morris0804d112008-06-06 18:40:29 +10001910 write_unlock_irq(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911
1912 /* Free the old policydb and SID table. */
1913 policydb_destroy(&oldpolicydb);
1914 sidtab_destroy(&oldsidtab);
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001915 kfree(oldmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916
1917 avc_ss_reset(seqno);
1918 selnl_notify_policyload(seqno);
KaiGai Kohei11904162010-09-14 18:28:39 +09001919 selinux_status_update_policyload(seqno);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001920 selinux_netlbl_cache_invalidate();
Venkat Yekkirala342a0cf2007-01-26 19:03:48 -08001921 selinux_xfrm_notify_policyload();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922
1923 return 0;
1924
1925err:
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04001926 kfree(map);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927 sidtab_destroy(&newsidtab);
1928 policydb_destroy(&newpolicydb);
1929 return rc;
1930
1931}
1932
Eric Pariscee74f42010-10-13 17:50:25 -04001933size_t security_policydb_len(void)
1934{
1935 size_t len;
1936
1937 read_lock(&policy_rwlock);
1938 len = policydb.len;
1939 read_unlock(&policy_rwlock);
1940
1941 return len;
1942}
1943
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944/**
1945 * security_port_sid - Obtain the SID for a port.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946 * @protocol: protocol number
1947 * @port: port number
1948 * @out_sid: security identifier
1949 */
Paul Moore3e112172008-04-10 10:48:14 -04001950int security_port_sid(u8 protocol, u16 port, u32 *out_sid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951{
1952 struct ocontext *c;
1953 int rc = 0;
1954
James Morris0804d112008-06-06 18:40:29 +10001955 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956
1957 c = policydb.ocontexts[OCON_PORT];
1958 while (c) {
1959 if (c->u.port.protocol == protocol &&
1960 c->u.port.low_port <= port &&
1961 c->u.port.high_port >= port)
1962 break;
1963 c = c->next;
1964 }
1965
1966 if (c) {
1967 if (!c->sid[0]) {
1968 rc = sidtab_context_to_sid(&sidtab,
1969 &c->context[0],
1970 &c->sid[0]);
1971 if (rc)
1972 goto out;
1973 }
1974 *out_sid = c->sid[0];
1975 } else {
1976 *out_sid = SECINITSID_PORT;
1977 }
1978
1979out:
James Morris0804d112008-06-06 18:40:29 +10001980 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001981 return rc;
1982}
1983
1984/**
1985 * security_netif_sid - Obtain the SID for a network interface.
1986 * @name: interface name
1987 * @if_sid: interface SID
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988 */
Paul Mooree8bfdb92008-01-29 08:38:08 -05001989int security_netif_sid(char *name, u32 *if_sid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990{
1991 int rc = 0;
1992 struct ocontext *c;
1993
James Morris0804d112008-06-06 18:40:29 +10001994 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995
1996 c = policydb.ocontexts[OCON_NETIF];
1997 while (c) {
1998 if (strcmp(name, c->u.name) == 0)
1999 break;
2000 c = c->next;
2001 }
2002
2003 if (c) {
2004 if (!c->sid[0] || !c->sid[1]) {
2005 rc = sidtab_context_to_sid(&sidtab,
2006 &c->context[0],
2007 &c->sid[0]);
2008 if (rc)
2009 goto out;
2010 rc = sidtab_context_to_sid(&sidtab,
2011 &c->context[1],
2012 &c->sid[1]);
2013 if (rc)
2014 goto out;
2015 }
2016 *if_sid = c->sid[0];
Paul Mooree8bfdb92008-01-29 08:38:08 -05002017 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002018 *if_sid = SECINITSID_NETIF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002019
2020out:
James Morris0804d112008-06-06 18:40:29 +10002021 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022 return rc;
2023}
2024
2025static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask)
2026{
2027 int i, fail = 0;
2028
Eric Paris5d55a342008-04-18 17:38:33 -04002029 for (i = 0; i < 4; i++)
2030 if (addr[i] != (input[i] & mask[i])) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002031 fail = 1;
2032 break;
2033 }
2034
2035 return !fail;
2036}
2037
2038/**
2039 * security_node_sid - Obtain the SID for a node (host).
2040 * @domain: communication domain aka address family
2041 * @addrp: address
2042 * @addrlen: address length in bytes
2043 * @out_sid: security identifier
2044 */
2045int security_node_sid(u16 domain,
2046 void *addrp,
2047 u32 addrlen,
2048 u32 *out_sid)
2049{
Eric Paris4b02b522010-11-23 11:40:08 -05002050 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051 struct ocontext *c;
2052
James Morris0804d112008-06-06 18:40:29 +10002053 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002054
2055 switch (domain) {
2056 case AF_INET: {
2057 u32 addr;
2058
Eric Paris4b02b522010-11-23 11:40:08 -05002059 rc = -EINVAL;
2060 if (addrlen != sizeof(u32))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002061 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062
2063 addr = *((u32 *)addrp);
2064
2065 c = policydb.ocontexts[OCON_NODE];
2066 while (c) {
2067 if (c->u.node.addr == (addr & c->u.node.mask))
2068 break;
2069 c = c->next;
2070 }
2071 break;
2072 }
2073
2074 case AF_INET6:
Eric Paris4b02b522010-11-23 11:40:08 -05002075 rc = -EINVAL;
2076 if (addrlen != sizeof(u64) * 2)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078 c = policydb.ocontexts[OCON_NODE6];
2079 while (c) {
2080 if (match_ipv6_addrmask(addrp, c->u.node6.addr,
2081 c->u.node6.mask))
2082 break;
2083 c = c->next;
2084 }
2085 break;
2086
2087 default:
Eric Paris4b02b522010-11-23 11:40:08 -05002088 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089 *out_sid = SECINITSID_NODE;
2090 goto out;
2091 }
2092
2093 if (c) {
2094 if (!c->sid[0]) {
2095 rc = sidtab_context_to_sid(&sidtab,
2096 &c->context[0],
2097 &c->sid[0]);
2098 if (rc)
2099 goto out;
2100 }
2101 *out_sid = c->sid[0];
2102 } else {
2103 *out_sid = SECINITSID_NODE;
2104 }
2105
Eric Paris4b02b522010-11-23 11:40:08 -05002106 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107out:
James Morris0804d112008-06-06 18:40:29 +10002108 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002109 return rc;
2110}
2111
2112#define SIDS_NEL 25
2113
2114/**
2115 * security_get_user_sids - Obtain reachable SIDs for a user.
2116 * @fromsid: starting SID
2117 * @username: username
2118 * @sids: array of reachable SIDs for user
2119 * @nel: number of elements in @sids
2120 *
2121 * Generate the set of SIDs for legal security contexts
2122 * for a given user that can be reached by @fromsid.
2123 * Set *@sids to point to a dynamically allocated
2124 * array containing the set of SIDs. Set *@nel to the
2125 * number of elements in the array.
2126 */
2127
2128int security_get_user_sids(u32 fromsid,
Eric Paris5d55a342008-04-18 17:38:33 -04002129 char *username,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002130 u32 **sids,
2131 u32 *nel)
2132{
2133 struct context *fromcon, usercon;
Stephen Smalley2c3c05d2007-06-07 15:34:10 -04002134 u32 *mysids = NULL, *mysids2, sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135 u32 mynel = 0, maxnel = SIDS_NEL;
2136 struct user_datum *user;
2137 struct role_datum *role;
Stephen Smalley782ebb92005-09-03 15:55:16 -07002138 struct ebitmap_node *rnode, *tnode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002139 int rc = 0, i, j;
2140
Stephen Smalley2c3c05d2007-06-07 15:34:10 -04002141 *sids = NULL;
2142 *nel = 0;
2143
2144 if (!ss_initialized)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002146
James Morris0804d112008-06-06 18:40:29 +10002147 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002148
Stephen Smalley12b29f32008-05-07 13:03:20 -04002149 context_init(&usercon);
2150
Eric Paris4b02b522010-11-23 11:40:08 -05002151 rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002152 fromcon = sidtab_search(&sidtab, fromsid);
Eric Paris4b02b522010-11-23 11:40:08 -05002153 if (!fromcon)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002154 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155
Eric Paris4b02b522010-11-23 11:40:08 -05002156 rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002157 user = hashtab_search(policydb.p_users.table, username);
Eric Paris4b02b522010-11-23 11:40:08 -05002158 if (!user)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159 goto out_unlock;
Eric Paris4b02b522010-11-23 11:40:08 -05002160
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161 usercon.user = user->value;
2162
Eric Paris4b02b522010-11-23 11:40:08 -05002163 rc = -ENOMEM;
James Morris89d155e2005-10-30 14:59:21 -08002164 mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC);
Eric Paris4b02b522010-11-23 11:40:08 -05002165 if (!mysids)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002166 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002167
KaiGai Kohei9fe79ad2007-09-29 02:20:55 +09002168 ebitmap_for_each_positive_bit(&user->roles, rnode, i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002169 role = policydb.role_val_to_struct[i];
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08002170 usercon.role = i + 1;
KaiGai Kohei9fe79ad2007-09-29 02:20:55 +09002171 ebitmap_for_each_positive_bit(&role->types, tnode, j) {
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08002172 usercon.type = j + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002173
2174 if (mls_setup_user_range(fromcon, user, &usercon))
2175 continue;
2176
Linus Torvalds1da177e2005-04-16 15:20:36 -07002177 rc = sidtab_context_to_sid(&sidtab, &usercon, &sid);
Stephen Smalley2c3c05d2007-06-07 15:34:10 -04002178 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002179 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002180 if (mynel < maxnel) {
2181 mysids[mynel++] = sid;
2182 } else {
Eric Paris4b02b522010-11-23 11:40:08 -05002183 rc = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002184 maxnel += SIDS_NEL;
James Morris89d155e2005-10-30 14:59:21 -08002185 mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC);
Eric Paris4b02b522010-11-23 11:40:08 -05002186 if (!mysids2)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002187 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002188 memcpy(mysids2, mysids, mynel * sizeof(*mysids2));
2189 kfree(mysids);
2190 mysids = mysids2;
2191 mysids[mynel++] = sid;
2192 }
2193 }
2194 }
Eric Paris4b02b522010-11-23 11:40:08 -05002195 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196out_unlock:
James Morris0804d112008-06-06 18:40:29 +10002197 read_unlock(&policy_rwlock);
Stephen Smalley2c3c05d2007-06-07 15:34:10 -04002198 if (rc || !mynel) {
2199 kfree(mysids);
2200 goto out;
2201 }
2202
Eric Paris4b02b522010-11-23 11:40:08 -05002203 rc = -ENOMEM;
Stephen Smalley2c3c05d2007-06-07 15:34:10 -04002204 mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL);
2205 if (!mysids2) {
Stephen Smalley2c3c05d2007-06-07 15:34:10 -04002206 kfree(mysids);
2207 goto out;
2208 }
2209 for (i = 0, j = 0; i < mynel; i++) {
2210 rc = avc_has_perm_noaudit(fromsid, mysids[i],
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04002211 SECCLASS_PROCESS, /* kernel value */
Stephen Smalley2c3c05d2007-06-07 15:34:10 -04002212 PROCESS__TRANSITION, AVC_STRICT,
2213 NULL);
2214 if (!rc)
2215 mysids2[j++] = mysids[i];
2216 cond_resched();
2217 }
2218 rc = 0;
2219 kfree(mysids);
2220 *sids = mysids2;
2221 *nel = j;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002222out:
2223 return rc;
2224}
2225
2226/**
2227 * security_genfs_sid - Obtain a SID for a file in a filesystem
2228 * @fstype: filesystem type
2229 * @path: path from root of mount
2230 * @sclass: file security class
2231 * @sid: SID for path
2232 *
2233 * Obtain a SID to use for a file in a filesystem that
2234 * cannot support xattr or use a fixed labeling behavior like
2235 * transition SIDs or task SIDs.
2236 */
2237int security_genfs_sid(const char *fstype,
Eric Paris5d55a342008-04-18 17:38:33 -04002238 char *path,
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04002239 u16 orig_sclass,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002240 u32 *sid)
2241{
2242 int len;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04002243 u16 sclass;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002244 struct genfs *genfs;
2245 struct ocontext *c;
Eric Paris4b02b522010-11-23 11:40:08 -05002246 int rc, cmp = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002247
Stephen Smalleyb1aa5302008-01-25 13:03:42 -05002248 while (path[0] == '/' && path[1] == '/')
2249 path++;
2250
James Morris0804d112008-06-06 18:40:29 +10002251 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002252
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04002253 sclass = unmap_class(orig_sclass);
Eric Paris4b02b522010-11-23 11:40:08 -05002254 *sid = SECINITSID_UNLABELED;
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -04002255
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256 for (genfs = policydb.genfs; genfs; genfs = genfs->next) {
2257 cmp = strcmp(fstype, genfs->fstype);
2258 if (cmp <= 0)
2259 break;
2260 }
2261
Eric Paris4b02b522010-11-23 11:40:08 -05002262 rc = -ENOENT;
2263 if (!genfs || cmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002264 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002265
2266 for (c = genfs->head; c; c = c->next) {
2267 len = strlen(c->u.name);
2268 if ((!c->v.sclass || sclass == c->v.sclass) &&
2269 (strncmp(c->u.name, path, len) == 0))
2270 break;
2271 }
2272
Eric Paris4b02b522010-11-23 11:40:08 -05002273 rc = -ENOENT;
2274 if (!c)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002275 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002276
2277 if (!c->sid[0]) {
Eric Paris4b02b522010-11-23 11:40:08 -05002278 rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002279 if (rc)
2280 goto out;
2281 }
2282
2283 *sid = c->sid[0];
Eric Paris4b02b522010-11-23 11:40:08 -05002284 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002285out:
James Morris0804d112008-06-06 18:40:29 +10002286 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002287 return rc;
2288}
2289
2290/**
2291 * security_fs_use - Determine how to handle labeling for a filesystem.
2292 * @fstype: filesystem type
2293 * @behavior: labeling behavior
2294 * @sid: SID for filesystem (superblock)
2295 */
2296int security_fs_use(
2297 const char *fstype,
2298 unsigned int *behavior,
James Morris089be432008-07-15 18:32:49 +10002299 u32 *sid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002300{
2301 int rc = 0;
2302 struct ocontext *c;
2303
James Morris0804d112008-06-06 18:40:29 +10002304 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002305
2306 c = policydb.ocontexts[OCON_FSUSE];
2307 while (c) {
2308 if (strcmp(fstype, c->u.name) == 0)
2309 break;
2310 c = c->next;
2311 }
2312
2313 if (c) {
2314 *behavior = c->v.behavior;
2315 if (!c->sid[0]) {
Eric Paris4b02b522010-11-23 11:40:08 -05002316 rc = sidtab_context_to_sid(&sidtab, &c->context[0],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002317 &c->sid[0]);
2318 if (rc)
2319 goto out;
2320 }
2321 *sid = c->sid[0];
2322 } else {
James Morris089be432008-07-15 18:32:49 +10002323 rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid);
2324 if (rc) {
2325 *behavior = SECURITY_FS_USE_NONE;
2326 rc = 0;
2327 } else {
2328 *behavior = SECURITY_FS_USE_GENFS;
2329 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002330 }
2331
2332out:
James Morris0804d112008-06-06 18:40:29 +10002333 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002334 return rc;
2335}
2336
2337int security_get_bools(int *len, char ***names, int **values)
2338{
Eric Paris4b02b522010-11-23 11:40:08 -05002339 int i, rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340
James Morris0804d112008-06-06 18:40:29 +10002341 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002342 *names = NULL;
2343 *values = NULL;
2344
Eric Paris4b02b522010-11-23 11:40:08 -05002345 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002346 *len = policydb.p_bools.nprim;
Eric Paris4b02b522010-11-23 11:40:08 -05002347 if (!*len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002348 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002349
Eric Paris4b02b522010-11-23 11:40:08 -05002350 rc = -ENOMEM;
2351 *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002352 if (!*names)
2353 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002354
Eric Paris4b02b522010-11-23 11:40:08 -05002355 rc = -ENOMEM;
2356 *values = kcalloc(*len, sizeof(int), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002357 if (!*values)
2358 goto err;
2359
2360 for (i = 0; i < *len; i++) {
2361 size_t name_len;
Eric Paris4b02b522010-11-23 11:40:08 -05002362
Linus Torvalds1da177e2005-04-16 15:20:36 -07002363 (*values)[i] = policydb.bool_val_to_struct[i]->state;
Eric Parisac76c052010-11-29 15:47:09 -05002364 name_len = strlen(sym_name(&policydb, SYM_BOOLS, i)) + 1;
Eric Paris4b02b522010-11-23 11:40:08 -05002365
2366 rc = -ENOMEM;
2367 (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002368 if (!(*names)[i])
2369 goto err;
Eric Paris4b02b522010-11-23 11:40:08 -05002370
Eric Parisac76c052010-11-29 15:47:09 -05002371 strncpy((*names)[i], sym_name(&policydb, SYM_BOOLS, i), name_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002372 (*names)[i][name_len - 1] = 0;
2373 }
2374 rc = 0;
2375out:
James Morris0804d112008-06-06 18:40:29 +10002376 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002377 return rc;
2378err:
2379 if (*names) {
2380 for (i = 0; i < *len; i++)
Jesper Juhl9a5f04b2005-06-25 14:58:51 -07002381 kfree((*names)[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002382 }
Jesper Juhl9a5f04b2005-06-25 14:58:51 -07002383 kfree(*values);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002384 goto out;
2385}
2386
2387
2388int security_set_bools(int len, int *values)
2389{
Eric Paris4b02b522010-11-23 11:40:08 -05002390 int i, rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002391 int lenp, seqno = 0;
2392 struct cond_node *cur;
2393
James Morris0804d112008-06-06 18:40:29 +10002394 write_lock_irq(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002395
Eric Paris4b02b522010-11-23 11:40:08 -05002396 rc = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002397 lenp = policydb.p_bools.nprim;
Eric Paris4b02b522010-11-23 11:40:08 -05002398 if (len != lenp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002399 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002400
Linus Torvalds1da177e2005-04-16 15:20:36 -07002401 for (i = 0; i < len; i++) {
Steve Grubbaf601e42006-01-04 14:08:39 +00002402 if (!!values[i] != policydb.bool_val_to_struct[i]->state) {
2403 audit_log(current->audit_context, GFP_ATOMIC,
2404 AUDIT_MAC_CONFIG_CHANGE,
Eric Paris4746ec52008-01-08 10:06:53 -05002405 "bool=%s val=%d old_val=%d auid=%u ses=%u",
Eric Parisac76c052010-11-29 15:47:09 -05002406 sym_name(&policydb, SYM_BOOLS, i),
Steve Grubbaf601e42006-01-04 14:08:39 +00002407 !!values[i],
2408 policydb.bool_val_to_struct[i]->state,
Eric Paris4746ec52008-01-08 10:06:53 -05002409 audit_get_loginuid(current),
2410 audit_get_sessionid(current));
Steve Grubbaf601e42006-01-04 14:08:39 +00002411 }
Eric Paris5d55a342008-04-18 17:38:33 -04002412 if (values[i])
Linus Torvalds1da177e2005-04-16 15:20:36 -07002413 policydb.bool_val_to_struct[i]->state = 1;
Eric Paris5d55a342008-04-18 17:38:33 -04002414 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002415 policydb.bool_val_to_struct[i]->state = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002416 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002417
Vesa-Matti Karidbc74c62008-08-07 03:18:20 +03002418 for (cur = policydb.cond_list; cur; cur = cur->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419 rc = evaluate_cond_node(&policydb, cur);
2420 if (rc)
2421 goto out;
2422 }
2423
2424 seqno = ++latest_granting;
Eric Paris4b02b522010-11-23 11:40:08 -05002425 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002426out:
James Morris0804d112008-06-06 18:40:29 +10002427 write_unlock_irq(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002428 if (!rc) {
2429 avc_ss_reset(seqno);
2430 selnl_notify_policyload(seqno);
KaiGai Kohei11904162010-09-14 18:28:39 +09002431 selinux_status_update_policyload(seqno);
Venkat Yekkirala342a0cf2007-01-26 19:03:48 -08002432 selinux_xfrm_notify_policyload();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002433 }
2434 return rc;
2435}
2436
2437int security_get_bool_value(int bool)
2438{
Eric Paris4b02b522010-11-23 11:40:08 -05002439 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002440 int len;
2441
James Morris0804d112008-06-06 18:40:29 +10002442 read_lock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002443
Eric Paris4b02b522010-11-23 11:40:08 -05002444 rc = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002445 len = policydb.p_bools.nprim;
Eric Paris4b02b522010-11-23 11:40:08 -05002446 if (bool >= len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002447 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002448
2449 rc = policydb.bool_val_to_struct[bool]->state;
2450out:
James Morris0804d112008-06-06 18:40:29 +10002451 read_unlock(&policy_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002452 return rc;
2453}
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002454
Stephen Smalleye900a7d2007-04-19 14:16:19 -04002455static int security_preserve_bools(struct policydb *p)
2456{
2457 int rc, nbools = 0, *bvalues = NULL, i;
2458 char **bnames = NULL;
2459 struct cond_bool_datum *booldatum;
2460 struct cond_node *cur;
2461
2462 rc = security_get_bools(&nbools, &bnames, &bvalues);
2463 if (rc)
2464 goto out;
2465 for (i = 0; i < nbools; i++) {
2466 booldatum = hashtab_search(p->p_bools.table, bnames[i]);
2467 if (booldatum)
2468 booldatum->state = bvalues[i];
2469 }
Vesa-Matti Karidbc74c62008-08-07 03:18:20 +03002470 for (cur = p->cond_list; cur; cur = cur->next) {
Stephen Smalleye900a7d2007-04-19 14:16:19 -04002471 rc = evaluate_cond_node(p, cur);
2472 if (rc)
2473 goto out;
2474 }
2475
2476out:
2477 if (bnames) {
2478 for (i = 0; i < nbools; i++)
2479 kfree(bnames[i]);
2480 }
2481 kfree(bnames);
2482 kfree(bvalues);
2483 return rc;
2484}
2485
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002486/*
2487 * security_sid_mls_copy() - computes a new sid based on the given
2488 * sid and the mls portion of mls_sid.
2489 */
2490int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid)
2491{
2492 struct context *context1;
2493 struct context *context2;
2494 struct context newcon;
2495 char *s;
2496 u32 len;
Eric Paris4b02b522010-11-23 11:40:08 -05002497 int rc;
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002498
Eric Paris4b02b522010-11-23 11:40:08 -05002499 rc = 0;
Guido Trentalancia0719aaf2010-02-03 16:40:20 +01002500 if (!ss_initialized || !policydb.mls_enabled) {
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002501 *new_sid = sid;
2502 goto out;
2503 }
2504
2505 context_init(&newcon);
2506
James Morris0804d112008-06-06 18:40:29 +10002507 read_lock(&policy_rwlock);
Eric Paris4b02b522010-11-23 11:40:08 -05002508
2509 rc = -EINVAL;
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002510 context1 = sidtab_search(&sidtab, sid);
2511 if (!context1) {
Eric Paris744ba352008-04-17 11:52:44 -04002512 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
2513 __func__, sid);
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002514 goto out_unlock;
2515 }
2516
Eric Paris4b02b522010-11-23 11:40:08 -05002517 rc = -EINVAL;
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002518 context2 = sidtab_search(&sidtab, mls_sid);
2519 if (!context2) {
Eric Paris744ba352008-04-17 11:52:44 -04002520 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
2521 __func__, mls_sid);
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002522 goto out_unlock;
2523 }
2524
2525 newcon.user = context1->user;
2526 newcon.role = context1->role;
2527 newcon.type = context1->type;
Venkat Yekkirala0efc61e2006-12-12 13:02:41 -06002528 rc = mls_context_cpy(&newcon, context2);
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002529 if (rc)
2530 goto out_unlock;
2531
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002532 /* Check the validity of the new context. */
2533 if (!policydb_context_isvalid(&policydb, &newcon)) {
2534 rc = convert_context_handle_invalid_context(&newcon);
Eric Paris4b02b522010-11-23 11:40:08 -05002535 if (rc) {
2536 if (!context_struct_to_string(&newcon, &s, &len)) {
2537 audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
2538 "security_sid_mls_copy: invalid context %s", s);
2539 kfree(s);
2540 }
2541 goto out_unlock;
2542 }
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002543 }
2544
2545 rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid);
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002546out_unlock:
James Morris0804d112008-06-06 18:40:29 +10002547 read_unlock(&policy_rwlock);
Venkat Yekkirala08554d62006-07-24 23:27:16 -07002548 context_destroy(&newcon);
2549out:
2550 return rc;
2551}
2552
Paul Moore220deb92008-01-29 08:38:23 -05002553/**
2554 * security_net_peersid_resolve - Compare and resolve two network peer SIDs
2555 * @nlbl_sid: NetLabel SID
2556 * @nlbl_type: NetLabel labeling protocol type
2557 * @xfrm_sid: XFRM SID
2558 *
2559 * Description:
2560 * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be
2561 * resolved into a single SID it is returned via @peer_sid and the function
2562 * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function
2563 * returns a negative value. A table summarizing the behavior is below:
2564 *
2565 * | function return | @sid
2566 * ------------------------------+-----------------+-----------------
2567 * no peer labels | 0 | SECSID_NULL
2568 * single peer label | 0 | <peer_label>
2569 * multiple, consistent labels | 0 | <peer_label>
2570 * multiple, inconsistent labels | -<errno> | SECSID_NULL
2571 *
2572 */
2573int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
2574 u32 xfrm_sid,
2575 u32 *peer_sid)
2576{
2577 int rc;
2578 struct context *nlbl_ctx;
2579 struct context *xfrm_ctx;
2580
Eric Paris4b02b522010-11-23 11:40:08 -05002581 *peer_sid = SECSID_NULL;
2582
Paul Moore220deb92008-01-29 08:38:23 -05002583 /* handle the common (which also happens to be the set of easy) cases
2584 * right away, these two if statements catch everything involving a
2585 * single or absent peer SID/label */
2586 if (xfrm_sid == SECSID_NULL) {
2587 *peer_sid = nlbl_sid;
2588 return 0;
2589 }
2590 /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label
2591 * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label
2592 * is present */
2593 if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) {
2594 *peer_sid = xfrm_sid;
2595 return 0;
2596 }
2597
2598 /* we don't need to check ss_initialized here since the only way both
2599 * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the
2600 * security server was initialized and ss_initialized was true */
Eric Paris4b02b522010-11-23 11:40:08 -05002601 if (!policydb.mls_enabled)
Paul Moore220deb92008-01-29 08:38:23 -05002602 return 0;
Paul Moore220deb92008-01-29 08:38:23 -05002603
James Morris0804d112008-06-06 18:40:29 +10002604 read_lock(&policy_rwlock);
Paul Moore220deb92008-01-29 08:38:23 -05002605
Eric Paris4b02b522010-11-23 11:40:08 -05002606 rc = -EINVAL;
Paul Moore220deb92008-01-29 08:38:23 -05002607 nlbl_ctx = sidtab_search(&sidtab, nlbl_sid);
2608 if (!nlbl_ctx) {
Eric Paris744ba352008-04-17 11:52:44 -04002609 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
2610 __func__, nlbl_sid);
Eric Paris4b02b522010-11-23 11:40:08 -05002611 goto out;
Paul Moore220deb92008-01-29 08:38:23 -05002612 }
Eric Paris4b02b522010-11-23 11:40:08 -05002613 rc = -EINVAL;
Paul Moore220deb92008-01-29 08:38:23 -05002614 xfrm_ctx = sidtab_search(&sidtab, xfrm_sid);
2615 if (!xfrm_ctx) {
Eric Paris744ba352008-04-17 11:52:44 -04002616 printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
2617 __func__, xfrm_sid);
Eric Paris4b02b522010-11-23 11:40:08 -05002618 goto out;
Paul Moore220deb92008-01-29 08:38:23 -05002619 }
2620 rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES);
Eric Paris4b02b522010-11-23 11:40:08 -05002621 if (rc)
2622 goto out;
Paul Moore220deb92008-01-29 08:38:23 -05002623
Eric Paris4b02b522010-11-23 11:40:08 -05002624 /* at present NetLabel SIDs/labels really only carry MLS
2625 * information so if the MLS portion of the NetLabel SID
2626 * matches the MLS portion of the labeled XFRM SID/label
2627 * then pass along the XFRM SID as it is the most
2628 * expressive */
2629 *peer_sid = xfrm_sid;
2630out:
James Morris0804d112008-06-06 18:40:29 +10002631 read_unlock(&policy_rwlock);
Paul Moore220deb92008-01-29 08:38:23 -05002632 return rc;
2633}
2634
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002635static int get_classes_callback(void *k, void *d, void *args)
2636{
2637 struct class_datum *datum = d;
2638 char *name = k, **classes = args;
2639 int value = datum->value - 1;
2640
2641 classes[value] = kstrdup(name, GFP_ATOMIC);
2642 if (!classes[value])
2643 return -ENOMEM;
2644
2645 return 0;
2646}
2647
2648int security_get_classes(char ***classes, int *nclasses)
2649{
Eric Paris4b02b522010-11-23 11:40:08 -05002650 int rc;
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002651
James Morris0804d112008-06-06 18:40:29 +10002652 read_lock(&policy_rwlock);
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002653
Eric Paris4b02b522010-11-23 11:40:08 -05002654 rc = -ENOMEM;
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002655 *nclasses = policydb.p_classes.nprim;
Julia Lawall9f59f902009-12-06 10:16:51 +01002656 *classes = kcalloc(*nclasses, sizeof(**classes), GFP_ATOMIC);
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002657 if (!*classes)
2658 goto out;
2659
2660 rc = hashtab_map(policydb.p_classes.table, get_classes_callback,
2661 *classes);
Eric Paris4b02b522010-11-23 11:40:08 -05002662 if (rc) {
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002663 int i;
2664 for (i = 0; i < *nclasses; i++)
2665 kfree((*classes)[i]);
2666 kfree(*classes);
2667 }
2668
2669out:
James Morris0804d112008-06-06 18:40:29 +10002670 read_unlock(&policy_rwlock);
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002671 return rc;
2672}
2673
2674static int get_permissions_callback(void *k, void *d, void *args)
2675{
2676 struct perm_datum *datum = d;
2677 char *name = k, **perms = args;
2678 int value = datum->value - 1;
2679
2680 perms[value] = kstrdup(name, GFP_ATOMIC);
2681 if (!perms[value])
2682 return -ENOMEM;
2683
2684 return 0;
2685}
2686
2687int security_get_permissions(char *class, char ***perms, int *nperms)
2688{
Eric Paris4b02b522010-11-23 11:40:08 -05002689 int rc, i;
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002690 struct class_datum *match;
2691
James Morris0804d112008-06-06 18:40:29 +10002692 read_lock(&policy_rwlock);
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002693
Eric Paris4b02b522010-11-23 11:40:08 -05002694 rc = -EINVAL;
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002695 match = hashtab_search(policydb.p_classes.table, class);
2696 if (!match) {
Eric Paris744ba352008-04-17 11:52:44 -04002697 printk(KERN_ERR "SELinux: %s: unrecognized class %s\n",
Harvey Harrisondd6f9532008-03-06 10:03:59 +11002698 __func__, class);
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002699 goto out;
2700 }
2701
Eric Paris4b02b522010-11-23 11:40:08 -05002702 rc = -ENOMEM;
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002703 *nperms = match->permissions.nprim;
Julia Lawall9f59f902009-12-06 10:16:51 +01002704 *perms = kcalloc(*nperms, sizeof(**perms), GFP_ATOMIC);
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002705 if (!*perms)
2706 goto out;
2707
2708 if (match->comdatum) {
2709 rc = hashtab_map(match->comdatum->permissions.table,
2710 get_permissions_callback, *perms);
Eric Paris4b02b522010-11-23 11:40:08 -05002711 if (rc)
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002712 goto err;
2713 }
2714
2715 rc = hashtab_map(match->permissions.table, get_permissions_callback,
2716 *perms);
Eric Paris4b02b522010-11-23 11:40:08 -05002717 if (rc)
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002718 goto err;
2719
2720out:
James Morris0804d112008-06-06 18:40:29 +10002721 read_unlock(&policy_rwlock);
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002722 return rc;
2723
2724err:
James Morris0804d112008-06-06 18:40:29 +10002725 read_unlock(&policy_rwlock);
Christopher J. PeBenito55fcf092007-05-23 09:12:06 -04002726 for (i = 0; i < *nperms; i++)
2727 kfree((*perms)[i]);
2728 kfree(*perms);
2729 return rc;
2730}
2731
Eric Paris3f120702007-09-21 14:37:10 -04002732int security_get_reject_unknown(void)
2733{
2734 return policydb.reject_unknown;
2735}
2736
2737int security_get_allow_unknown(void)
2738{
2739 return policydb.allow_unknown;
2740}
2741
Paul Moore3bb56b22008-01-29 08:38:19 -05002742/**
Paul Moore3bb56b22008-01-29 08:38:19 -05002743 * security_policycap_supported - Check for a specific policy capability
2744 * @req_cap: capability
2745 *
2746 * Description:
2747 * This function queries the currently loaded policy to see if it supports the
2748 * capability specified by @req_cap. Returns true (1) if the capability is
2749 * supported, false (0) if it isn't supported.
2750 *
2751 */
2752int security_policycap_supported(unsigned int req_cap)
2753{
2754 int rc;
2755
James Morris0804d112008-06-06 18:40:29 +10002756 read_lock(&policy_rwlock);
Paul Moore3bb56b22008-01-29 08:38:19 -05002757 rc = ebitmap_get_bit(&policydb.policycaps, req_cap);
James Morris0804d112008-06-06 18:40:29 +10002758 read_unlock(&policy_rwlock);
Paul Moore3bb56b22008-01-29 08:38:19 -05002759
2760 return rc;
2761}
2762
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002763struct selinux_audit_rule {
2764 u32 au_seqno;
2765 struct context au_ctxt;
2766};
2767
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +02002768void selinux_audit_rule_free(void *vrule)
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002769{
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +02002770 struct selinux_audit_rule *rule = vrule;
2771
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002772 if (rule) {
2773 context_destroy(&rule->au_ctxt);
2774 kfree(rule);
2775 }
2776}
2777
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +02002778int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002779{
2780 struct selinux_audit_rule *tmprule;
2781 struct role_datum *roledatum;
2782 struct type_datum *typedatum;
2783 struct user_datum *userdatum;
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +02002784 struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002785 int rc = 0;
2786
2787 *rule = NULL;
2788
2789 if (!ss_initialized)
Steve G3ad40d62007-08-14 12:50:46 -07002790 return -EOPNOTSUPP;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002791
2792 switch (field) {
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05002793 case AUDIT_SUBJ_USER:
2794 case AUDIT_SUBJ_ROLE:
2795 case AUDIT_SUBJ_TYPE:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05002796 case AUDIT_OBJ_USER:
2797 case AUDIT_OBJ_ROLE:
2798 case AUDIT_OBJ_TYPE:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002799 /* only 'equals' and 'not equals' fit user, role, and type */
Al Viro5af75d82008-12-16 05:59:26 -05002800 if (op != Audit_equal && op != Audit_not_equal)
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002801 return -EINVAL;
2802 break;
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05002803 case AUDIT_SUBJ_SEN:
2804 case AUDIT_SUBJ_CLR:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05002805 case AUDIT_OBJ_LEV_LOW:
2806 case AUDIT_OBJ_LEV_HIGH:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002807 /* we do not allow a range, indicated by the presense of '-' */
2808 if (strchr(rulestr, '-'))
2809 return -EINVAL;
2810 break;
2811 default:
2812 /* only the above fields are valid */
2813 return -EINVAL;
2814 }
2815
2816 tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL);
2817 if (!tmprule)
2818 return -ENOMEM;
2819
2820 context_init(&tmprule->au_ctxt);
2821
James Morris0804d112008-06-06 18:40:29 +10002822 read_lock(&policy_rwlock);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002823
2824 tmprule->au_seqno = latest_granting;
2825
2826 switch (field) {
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05002827 case AUDIT_SUBJ_USER:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05002828 case AUDIT_OBJ_USER:
Eric Paris4b02b522010-11-23 11:40:08 -05002829 rc = -EINVAL;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002830 userdatum = hashtab_search(policydb.p_users.table, rulestr);
2831 if (!userdatum)
Eric Paris4b02b522010-11-23 11:40:08 -05002832 goto out;
2833 tmprule->au_ctxt.user = userdatum->value;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002834 break;
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05002835 case AUDIT_SUBJ_ROLE:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05002836 case AUDIT_OBJ_ROLE:
Eric Paris4b02b522010-11-23 11:40:08 -05002837 rc = -EINVAL;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002838 roledatum = hashtab_search(policydb.p_roles.table, rulestr);
2839 if (!roledatum)
Eric Paris4b02b522010-11-23 11:40:08 -05002840 goto out;
2841 tmprule->au_ctxt.role = roledatum->value;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002842 break;
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05002843 case AUDIT_SUBJ_TYPE:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05002844 case AUDIT_OBJ_TYPE:
Eric Paris4b02b522010-11-23 11:40:08 -05002845 rc = -EINVAL;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002846 typedatum = hashtab_search(policydb.p_types.table, rulestr);
2847 if (!typedatum)
Eric Paris4b02b522010-11-23 11:40:08 -05002848 goto out;
2849 tmprule->au_ctxt.type = typedatum->value;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002850 break;
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05002851 case AUDIT_SUBJ_SEN:
2852 case AUDIT_SUBJ_CLR:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05002853 case AUDIT_OBJ_LEV_LOW:
2854 case AUDIT_OBJ_LEV_HIGH:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002855 rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC);
Eric Paris4b02b522010-11-23 11:40:08 -05002856 if (rc)
2857 goto out;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002858 break;
2859 }
Eric Paris4b02b522010-11-23 11:40:08 -05002860 rc = 0;
2861out:
James Morris0804d112008-06-06 18:40:29 +10002862 read_unlock(&policy_rwlock);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002863
2864 if (rc) {
2865 selinux_audit_rule_free(tmprule);
2866 tmprule = NULL;
2867 }
2868
2869 *rule = tmprule;
2870
2871 return rc;
2872}
2873
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +02002874/* Check to see if the rule contains any selinux fields */
2875int selinux_audit_rule_known(struct audit_krule *rule)
2876{
2877 int i;
2878
2879 for (i = 0; i < rule->field_count; i++) {
2880 struct audit_field *f = &rule->fields[i];
2881 switch (f->type) {
2882 case AUDIT_SUBJ_USER:
2883 case AUDIT_SUBJ_ROLE:
2884 case AUDIT_SUBJ_TYPE:
2885 case AUDIT_SUBJ_SEN:
2886 case AUDIT_SUBJ_CLR:
2887 case AUDIT_OBJ_USER:
2888 case AUDIT_OBJ_ROLE:
2889 case AUDIT_OBJ_TYPE:
2890 case AUDIT_OBJ_LEV_LOW:
2891 case AUDIT_OBJ_LEV_HIGH:
2892 return 1;
2893 }
2894 }
2895
2896 return 0;
2897}
2898
2899int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule,
Eric Parisf5269712008-05-14 11:27:45 -04002900 struct audit_context *actx)
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002901{
2902 struct context *ctxt;
2903 struct mls_level *level;
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +02002904 struct selinux_audit_rule *rule = vrule;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002905 int match = 0;
2906
2907 if (!rule) {
2908 audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR,
Eric Paris5d55a342008-04-18 17:38:33 -04002909 "selinux_audit_rule_match: missing rule\n");
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002910 return -ENOENT;
2911 }
2912
James Morris0804d112008-06-06 18:40:29 +10002913 read_lock(&policy_rwlock);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002914
2915 if (rule->au_seqno < latest_granting) {
2916 audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR,
Eric Paris5d55a342008-04-18 17:38:33 -04002917 "selinux_audit_rule_match: stale rule\n");
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002918 match = -ESTALE;
2919 goto out;
2920 }
2921
Stephen Smalley9a2f44f2006-09-25 23:31:58 -07002922 ctxt = sidtab_search(&sidtab, sid);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002923 if (!ctxt) {
2924 audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR,
Eric Paris5d55a342008-04-18 17:38:33 -04002925 "selinux_audit_rule_match: unrecognized SID %d\n",
2926 sid);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002927 match = -ENOENT;
2928 goto out;
2929 }
2930
2931 /* a field/op pair that is not caught here will simply fall through
2932 without a match */
2933 switch (field) {
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05002934 case AUDIT_SUBJ_USER:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05002935 case AUDIT_OBJ_USER:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002936 switch (op) {
Al Viro5af75d82008-12-16 05:59:26 -05002937 case Audit_equal:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002938 match = (ctxt->user == rule->au_ctxt.user);
2939 break;
Al Viro5af75d82008-12-16 05:59:26 -05002940 case Audit_not_equal:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002941 match = (ctxt->user != rule->au_ctxt.user);
2942 break;
2943 }
2944 break;
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05002945 case AUDIT_SUBJ_ROLE:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05002946 case AUDIT_OBJ_ROLE:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002947 switch (op) {
Al Viro5af75d82008-12-16 05:59:26 -05002948 case Audit_equal:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002949 match = (ctxt->role == rule->au_ctxt.role);
2950 break;
Al Viro5af75d82008-12-16 05:59:26 -05002951 case Audit_not_equal:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002952 match = (ctxt->role != rule->au_ctxt.role);
2953 break;
2954 }
2955 break;
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05002956 case AUDIT_SUBJ_TYPE:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05002957 case AUDIT_OBJ_TYPE:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002958 switch (op) {
Al Viro5af75d82008-12-16 05:59:26 -05002959 case Audit_equal:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002960 match = (ctxt->type == rule->au_ctxt.type);
2961 break;
Al Viro5af75d82008-12-16 05:59:26 -05002962 case Audit_not_equal:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002963 match = (ctxt->type != rule->au_ctxt.type);
2964 break;
2965 }
2966 break;
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -05002967 case AUDIT_SUBJ_SEN:
2968 case AUDIT_SUBJ_CLR:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -05002969 case AUDIT_OBJ_LEV_LOW:
2970 case AUDIT_OBJ_LEV_HIGH:
2971 level = ((field == AUDIT_SUBJ_SEN ||
Eric Paris5d55a342008-04-18 17:38:33 -04002972 field == AUDIT_OBJ_LEV_LOW) ?
2973 &ctxt->range.level[0] : &ctxt->range.level[1]);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002974 switch (op) {
Al Viro5af75d82008-12-16 05:59:26 -05002975 case Audit_equal:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002976 match = mls_level_eq(&rule->au_ctxt.range.level[0],
Eric Paris5d55a342008-04-18 17:38:33 -04002977 level);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002978 break;
Al Viro5af75d82008-12-16 05:59:26 -05002979 case Audit_not_equal:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002980 match = !mls_level_eq(&rule->au_ctxt.range.level[0],
Eric Paris5d55a342008-04-18 17:38:33 -04002981 level);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002982 break;
Al Viro5af75d82008-12-16 05:59:26 -05002983 case Audit_lt:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002984 match = (mls_level_dom(&rule->au_ctxt.range.level[0],
Eric Paris5d55a342008-04-18 17:38:33 -04002985 level) &&
2986 !mls_level_eq(&rule->au_ctxt.range.level[0],
2987 level));
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002988 break;
Al Viro5af75d82008-12-16 05:59:26 -05002989 case Audit_le:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002990 match = mls_level_dom(&rule->au_ctxt.range.level[0],
Eric Paris5d55a342008-04-18 17:38:33 -04002991 level);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002992 break;
Al Viro5af75d82008-12-16 05:59:26 -05002993 case Audit_gt:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002994 match = (mls_level_dom(level,
Eric Paris5d55a342008-04-18 17:38:33 -04002995 &rule->au_ctxt.range.level[0]) &&
2996 !mls_level_eq(level,
2997 &rule->au_ctxt.range.level[0]));
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06002998 break;
Al Viro5af75d82008-12-16 05:59:26 -05002999 case Audit_ge:
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003000 match = mls_level_dom(level,
Eric Paris5d55a342008-04-18 17:38:33 -04003001 &rule->au_ctxt.range.level[0]);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003002 break;
3003 }
3004 }
3005
3006out:
James Morris0804d112008-06-06 18:40:29 +10003007 read_unlock(&policy_rwlock);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003008 return match;
3009}
3010
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +02003011static int (*aurule_callback)(void) = audit_update_lsm_rules;
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003012
3013static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid,
Eric Parisf5269712008-05-14 11:27:45 -04003014 u16 class, u32 perms, u32 *retained)
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003015{
3016 int err = 0;
3017
3018 if (event == AVC_CALLBACK_RESET && aurule_callback)
3019 err = aurule_callback();
3020 return err;
3021}
3022
3023static int __init aurule_init(void)
3024{
3025 int err;
3026
3027 err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET,
Eric Paris5d55a342008-04-18 17:38:33 -04003028 SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0);
Darrel Goeddel376bd9c2006-02-24 15:44:05 -06003029 if (err)
3030 panic("avc_add_callback() failed, error %d\n", err);
3031
3032 return err;
3033}
3034__initcall(aurule_init);
3035
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003036#ifdef CONFIG_NETLABEL
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003037/**
Paul Moore5778eab2007-02-28 15:14:22 -05003038 * security_netlbl_cache_add - Add an entry to the NetLabel cache
3039 * @secattr: the NetLabel packet security attributes
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003040 * @sid: the SELinux SID
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003041 *
3042 * Description:
3043 * Attempt to cache the context in @ctx, which was derived from the packet in
Paul Moore5778eab2007-02-28 15:14:22 -05003044 * @skb, in the NetLabel subsystem cache. This function assumes @secattr has
3045 * already been initialized.
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003046 *
3047 */
Paul Moore5778eab2007-02-28 15:14:22 -05003048static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr,
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003049 u32 sid)
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003050{
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003051 u32 *sid_cache;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003052
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003053 sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC);
3054 if (sid_cache == NULL)
3055 return;
Paul Moore5778eab2007-02-28 15:14:22 -05003056 secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC);
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003057 if (secattr->cache == NULL) {
3058 kfree(sid_cache);
Paul Moore5778eab2007-02-28 15:14:22 -05003059 return;
Jesper Juhl0ec8abd2007-07-21 00:12:44 +02003060 }
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003061
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003062 *sid_cache = sid;
3063 secattr->cache->free = kfree;
3064 secattr->cache->data = sid_cache;
Paul Moore5778eab2007-02-28 15:14:22 -05003065 secattr->flags |= NETLBL_SECATTR_CACHE;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003066}
3067
3068/**
Paul Moore5778eab2007-02-28 15:14:22 -05003069 * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003070 * @secattr: the NetLabel packet security attributes
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003071 * @sid: the SELinux SID
3072 *
3073 * Description:
Paul Moore5778eab2007-02-28 15:14:22 -05003074 * Convert the given NetLabel security attributes in @secattr into a
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003075 * SELinux SID. If the @secattr field does not contain a full SELinux
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003076 * SID/context then use SECINITSID_NETMSG as the foundation. If possibile the
3077 * 'cache' field of @secattr is set and the CACHE flag is set; this is to
3078 * allow the @secattr to be used by NetLabel to cache the secattr to SID
3079 * conversion for future lookups. Returns zero on success, negative values on
3080 * failure.
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003081 *
3082 */
Paul Moore5778eab2007-02-28 15:14:22 -05003083int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
Paul Moore5778eab2007-02-28 15:14:22 -05003084 u32 *sid)
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003085{
Eric Paris7ae9f232010-11-23 11:40:09 -05003086 int rc;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003087 struct context *ctx;
3088 struct context ctx_new;
Paul Moore5778eab2007-02-28 15:14:22 -05003089
3090 if (!ss_initialized) {
3091 *sid = SECSID_NULL;
3092 return 0;
3093 }
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003094
James Morris0804d112008-06-06 18:40:29 +10003095 read_lock(&policy_rwlock);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003096
Eric Paris7ae9f232010-11-23 11:40:09 -05003097 if (secattr->flags & NETLBL_SECATTR_CACHE)
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003098 *sid = *(u32 *)secattr->cache->data;
Eric Paris7ae9f232010-11-23 11:40:09 -05003099 else if (secattr->flags & NETLBL_SECATTR_SECID)
Paul Moore16efd452008-01-29 08:37:59 -05003100 *sid = secattr->attr.secid;
Eric Paris7ae9f232010-11-23 11:40:09 -05003101 else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) {
3102 rc = -EIDRM;
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003103 ctx = sidtab_search(&sidtab, SECINITSID_NETMSG);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003104 if (ctx == NULL)
Eric Paris7ae9f232010-11-23 11:40:09 -05003105 goto out;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003106
Paul Moore81990fb2008-10-03 10:51:15 -04003107 context_init(&ctx_new);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003108 ctx_new.user = ctx->user;
3109 ctx_new.role = ctx->role;
3110 ctx_new.type = ctx->type;
Paul Moore02752762006-11-29 13:18:18 -05003111 mls_import_netlbl_lvl(&ctx_new, secattr);
Paul Moore701a90b2006-11-17 17:38:46 -05003112 if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
Eric Paris7ae9f232010-11-23 11:40:09 -05003113 rc = ebitmap_netlbl_import(&ctx_new.range.level[0].cat,
3114 secattr->attr.mls.cat);
3115 if (rc)
3116 goto out;
Paul Moore81990fb2008-10-03 10:51:15 -04003117 memcpy(&ctx_new.range.level[1].cat,
3118 &ctx_new.range.level[0].cat,
3119 sizeof(ctx_new.range.level[0].cat));
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003120 }
Eric Paris7ae9f232010-11-23 11:40:09 -05003121 rc = -EIDRM;
3122 if (!mls_context_isvalid(&policydb, &ctx_new))
3123 goto out_free;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003124
3125 rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid);
Eric Paris7ae9f232010-11-23 11:40:09 -05003126 if (rc)
3127 goto out_free;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003128
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003129 security_netlbl_cache_add(secattr, *sid);
Paul Moore5778eab2007-02-28 15:14:22 -05003130
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003131 ebitmap_destroy(&ctx_new.range.level[0].cat);
Eric Paris7ae9f232010-11-23 11:40:09 -05003132 } else
paul.moore@hp.com388b2402006-10-05 18:28:24 -04003133 *sid = SECSID_NULL;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003134
Eric Paris7ae9f232010-11-23 11:40:09 -05003135 read_unlock(&policy_rwlock);
3136 return 0;
3137out_free:
3138 ebitmap_destroy(&ctx_new.range.level[0].cat);
3139out:
James Morris0804d112008-06-06 18:40:29 +10003140 read_unlock(&policy_rwlock);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003141 return rc;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003142}
3143
3144/**
Paul Moore5778eab2007-02-28 15:14:22 -05003145 * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr
3146 * @sid: the SELinux SID
3147 * @secattr: the NetLabel packet security attributes
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003148 *
3149 * Description:
Paul Moore5778eab2007-02-28 15:14:22 -05003150 * Convert the given SELinux SID in @sid into a NetLabel security attribute.
3151 * Returns zero on success, negative values on failure.
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003152 *
3153 */
Paul Moore5778eab2007-02-28 15:14:22 -05003154int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr)
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003155{
Paul Moore99d854d2008-10-10 10:16:30 -04003156 int rc;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003157 struct context *ctx;
3158
3159 if (!ss_initialized)
3160 return 0;
3161
James Morris0804d112008-06-06 18:40:29 +10003162 read_lock(&policy_rwlock);
Eric Paris4b02b522010-11-23 11:40:08 -05003163
3164 rc = -ENOENT;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003165 ctx = sidtab_search(&sidtab, sid);
Eric Paris4b02b522010-11-23 11:40:08 -05003166 if (ctx == NULL)
3167 goto out;
3168
3169 rc = -ENOMEM;
Eric Parisac76c052010-11-29 15:47:09 -05003170 secattr->domain = kstrdup(sym_name(&policydb, SYM_TYPES, ctx->type - 1),
Paul Moore5778eab2007-02-28 15:14:22 -05003171 GFP_ATOMIC);
Eric Paris4b02b522010-11-23 11:40:08 -05003172 if (secattr->domain == NULL)
3173 goto out;
3174
Paul Moore8d758992008-10-10 10:16:33 -04003175 secattr->attr.secid = sid;
3176 secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID;
Paul Moore5778eab2007-02-28 15:14:22 -05003177 mls_export_netlbl_lvl(ctx, secattr);
3178 rc = mls_export_netlbl_cat(ctx, secattr);
Eric Paris4b02b522010-11-23 11:40:08 -05003179out:
James Morris0804d112008-06-06 18:40:29 +10003180 read_unlock(&policy_rwlock);
Paul Mooref8687af2006-10-30 15:22:15 -08003181 return rc;
3182}
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003183#endif /* CONFIG_NETLABEL */
Eric Pariscee74f42010-10-13 17:50:25 -04003184
3185/**
3186 * security_read_policy - read the policy.
3187 * @data: binary policy data
3188 * @len: length of data in bytes
3189 *
3190 */
3191int security_read_policy(void **data, ssize_t *len)
3192{
3193 int rc;
3194 struct policy_file fp;
3195
3196 if (!ss_initialized)
3197 return -EINVAL;
3198
3199 *len = security_policydb_len();
3200
Eric Paris845ca302010-10-13 17:50:31 -04003201 *data = vmalloc_user(*len);
Eric Pariscee74f42010-10-13 17:50:25 -04003202 if (!*data)
3203 return -ENOMEM;
3204
3205 fp.data = *data;
3206 fp.len = *len;
3207
3208 read_lock(&policy_rwlock);
3209 rc = policydb_write(&policydb, &fp);
3210 read_unlock(&policy_rwlock);
3211
3212 if (rc)
3213 return rc;
3214
3215 *len = (unsigned long)fp.data - (unsigned long)*data;
3216 return 0;
3217
3218}