projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
block: respect virtual boundary mask in bvecs
[linux-2.6-block.git] / security / selinux / ss / services.c
CommitLineData
1da177e4
LT		 1/*
2 * Implementation of the security services.
3 *
7efbb60b 4 * Authors : Stephen Smalley, <sds@tycho.nsa.gov>
5d55a345 5 * James Morris <jmorris@redhat.com>
1da177e4
LT		 6 *
7 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
8 *
9 * Support for enhanced MLS infrastructure.
376bd9cb 10 * Support for context based audit filters.
1da177e4
LT		 11 *
12 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
13 *
5d55a345 14 * Added conditional policy language extensions
1da177e4 15 *
82c21bfa 16 * Updated: Hewlett-Packard <paul@paul-moore.com>
7420ed23
VY		 17 *
18 * Added support for NetLabel
3bb56b25 19 * Added support for the policy capability bitmap
7420ed23 20 *
b94c7e67
CS		 21 * Updated: Chad Sellers <csellers@tresys.com>
22 *
23 * Added validation of kernel classes and permissions
24 *
44c2d9bd
KK		 25 * Updated: KaiGai Kohei <kaigai@ak.jp.nec.com>
26 *
27 * Added support for bounds domain and audit messaged on masked permissions
28 *
0719aaf5
GT		 29 * Updated: Guido Trentalancia <guido@trentalancia.com>
30 *
31 * Added support for runtime switching of the policy type
32 *
44c2d9bd 33 * Copyright (C) 2008, 2009 NEC Corporation
3bb56b25 34 * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P.
376bd9cb 35 * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
b94c7e67 36 * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC
1da177e4
LT		 37 * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
38 * This program is free software; you can redistribute it and/or modify
5d55a345 39 * it under the terms of the GNU General Public License as published by
1da177e4
LT		 40 * 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>
9f2ad665 46#include <linux/rcupdate.h>
1da177e4
LT		 47#include <linux/errno.h>
48#include <linux/in.h>
49#include <linux/sched.h>
50#include <linux/audit.h>
bb003079 51#include <linux/mutex.h>
0e55a004 52#include <linux/selinux.h>
6371dcd3 53#include <linux/flex_array.h>
f0d3d989 54#include <linux/vmalloc.h>
7420ed23 55#include <net/netlabel.h>
bb003079 56
1da177e4
LT		 57#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"
7420ed23 67#include "objsec.h"
c60475bf 68#include "netlabel.h"
3de4bab5 69#include "xfrm.h"
02752760 70#include "ebitmap.h"
9d57a7f9 71#include "audit.h"
1da177e4 72
4dc2fce3
SS		 73/* Policy capability names */
74char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX] = {
75 "network_peer_controls",
76 "open_perms",
77 "extended_socket_class",
78 "always_check_network",
af63f419
SS		 79 "cgroup_seclabel",
80 "nnp_nosuid_transition"
4dc2fce3
SS		 81};
82
aa8e712c 83static struct selinux_ss selinux_ss;
3bb56b25 84
aa8e712c
SS		 85void selinux_ss_init(struct selinux_ss **ss)
86{
87 rwlock_init(&selinux_ss.policy_rwlock);
88 mutex_init(&selinux_ss.status_lock);
89 *ss = &selinux_ss;
90}
1da177e4
LT		 91
92/* Forward declaration. */
aa8e712c
SS		 93static int context_struct_to_string(struct policydb *policydb,
94 struct context *context,
95 char **scontext,
1da177e4
LT		 96 u32 *scontext_len);
97
aa8e712c
SS		 98static void context_struct_compute_av(struct policydb *policydb,
99 struct context *scontext,
100 struct context *tcontext,
101 u16 tclass,
102 struct av_decision *avd,
103 struct extended_perms *xperms);
c6d3aaa4
SS		 104
105static int selinux_set_mapping(struct policydb *pol,
106 struct security_class_mapping *map,
aa8e712c 107 struct selinux_map *out_map)
c6d3aaa4 108{
c6d3aaa4
SS		 109 u16 i, j;
110 unsigned k;
111 bool print_unknown_handle = false;
112
113 /* Find number of classes in the input mapping */
114 if (!map)
115 return -EINVAL;
116 i = 0;
117 while (map[i].name)
118 i++;
119
120 /* Allocate space for the class records, plus one for class zero */
aa8e712c
SS		 121 out_map->mapping = kcalloc(++i, sizeof(*out_map->mapping), GFP_ATOMIC);
122 if (!out_map->mapping)
c6d3aaa4
SS		 123 return -ENOMEM;
124
125 /* Store the raw class and permission values */
126 j = 0;
127 while (map[j].name) {
128 struct security_class_mapping *p_in = map + (j++);
aa8e712c 129 struct selinux_mapping *p_out = out_map->mapping + j;
c6d3aaa4
SS		 130
131 /* An empty class string skips ahead */
132 if (!strcmp(p_in->name, "")) {
133 p_out->num_perms = 0;
134 continue;
135 }
136
137 p_out->value = string_to_security_class(pol, p_in->name);
138 if (!p_out->value) {
b54c85c1 139 pr_info("SELinux: Class %s not defined in policy.\n",
c6d3aaa4
SS		 140 p_in->name);
141 if (pol->reject_unknown)
142 goto err;
143 p_out->num_perms = 0;
144 print_unknown_handle = true;
145 continue;
146 }
147
148 k = 0;
342e9157 149 while (p_in->perms[k]) {
c6d3aaa4
SS		 150 /* An empty permission string skips ahead */
151 if (!*p_in->perms[k]) {
152 k++;
153 continue;
154 }
155 p_out->perms[k] = string_to_av_perm(pol, p_out->value,
156 p_in->perms[k]);
157 if (!p_out->perms[k]) {
b54c85c1 158 pr_info("SELinux: Permission %s in class %s not defined in policy.\n",
c6d3aaa4
SS		 159 p_in->perms[k], p_in->name);
160 if (pol->reject_unknown)
161 goto err;
162 print_unknown_handle = true;
163 }
164
165 k++;
166 }
167 p_out->num_perms = k;
168 }
169
170 if (print_unknown_handle)
b54c85c1 171 pr_info("SELinux: the above unknown classes and permissions will be %s\n",
c6d3aaa4
SS		 172 pol->allow_unknown ? "allowed" : "denied");
173
aa8e712c 174 out_map->size = i;
c6d3aaa4
SS		 175 return 0;
176err:
aa8e712c
SS		 177 kfree(out_map->mapping);
178 out_map->mapping = NULL;
c6d3aaa4
SS		 179 return -EINVAL;
180}
181
182/*
183 * Get real, policy values from mapped values
184 */
185
aa8e712c 186static u16 unmap_class(struct selinux_map *map, u16 tclass)
c6d3aaa4 187{
aa8e712c
SS		 188 if (tclass < map->size)
189 return map->mapping[tclass].value;
c6d3aaa4
SS		 190
191 return tclass;
192}
193
6f5317e7
HC		 194/*
195 * Get kernel value for class from its policy value
196 */
aa8e712c 197static u16 map_class(struct selinux_map *map, u16 pol_value)
6f5317e7
HC		 198{
199 u16 i;
200
aa8e712c
SS		 201 for (i = 1; i < map->size; i++) {
202 if (map->mapping[i].value == pol_value)
6f5317e7
HC		 203 return i;
204 }
205
85cd6da5 206 return SECCLASS_NULL;
6f5317e7
HC		 207}
208
aa8e712c
SS		 209static void map_decision(struct selinux_map *map,
210 u16 tclass, struct av_decision *avd,
c6d3aaa4
SS		 211 int allow_unknown)
212{
aa8e712c
SS		 213 if (tclass < map->size) {
214 struct selinux_mapping *mapping = &map->mapping[tclass];
215 unsigned int i, n = mapping->num_perms;
c6d3aaa4
SS		 216 u32 result;
217
218 for (i = 0, result = 0; i < n; i++) {
aa8e712c 219 if (avd->allowed & mapping->perms[i])
c6d3aaa4 220 result |= 1<<i;
aa8e712c 221 if (allow_unknown && !mapping->perms[i])
c6d3aaa4
SS		 222 result |= 1<<i;
223 }
224 avd->allowed = result;
225
226 for (i = 0, result = 0; i < n; i++)
aa8e712c 227 if (avd->auditallow & mapping->perms[i])
c6d3aaa4
SS		 228 result |= 1<<i;
229 avd->auditallow = result;
230
231 for (i = 0, result = 0; i < n; i++) {
aa8e712c 232 if (avd->auditdeny & mapping->perms[i])
c6d3aaa4 233 result |= 1<<i;
aa8e712c 234 if (!allow_unknown && !mapping->perms[i])
c6d3aaa4
SS		 235 result |= 1<<i;
236 }
0bce9527
EP		 237 /*
238 * In case the kernel has a bug and requests a permission
239 * between num_perms and the maximum permission number, we
240 * should audit that denial
241 */
242 for (; i < (sizeof(u32)*8); i++)
243 result |= 1<<i;
c6d3aaa4
SS		 244 avd->auditdeny = result;
245 }
246}
247
aa8e712c 248int security_mls_enabled(struct selinux_state *state)
0719aaf5 249{
aa8e712c
SS		 250 struct policydb *p = &state->ss->policydb;
251
252 return p->mls_enabled;
0719aaf5 253}
c6d3aaa4 254
1da177e4
LT		 255/*
256 * Return the boolean value of a constraint expression
257 * when it is applied to the specified source and target
258 * security contexts.
259 *
260 * xcontext is a special beast... It is used by the validatetrans rules
261 * only. For these rules, scontext is the context before the transition,
262 * tcontext is the context after the transition, and xcontext is the context
263 * of the process performing the transition. All other callers of
264 * constraint_expr_eval should pass in NULL for xcontext.
265 */
aa8e712c
SS		 266static int constraint_expr_eval(struct policydb *policydb,
267 struct context *scontext,
1da177e4
LT		 268 struct context *tcontext,
269 struct context *xcontext,
270 struct constraint_expr *cexpr)
271{
272 u32 val1, val2;
273 struct context *c;
274 struct role_datum *r1, *r2;
275 struct mls_level *l1, *l2;
276 struct constraint_expr *e;
277 int s[CEXPR_MAXDEPTH];
278 int sp = -1;
279
280 for (e = cexpr; e; e = e->next) {
281 switch (e->expr_type) {
282 case CEXPR_NOT:
283 BUG_ON(sp < 0);
284 s[sp] = !s[sp];
285 break;
286 case CEXPR_AND:
287 BUG_ON(sp < 1);
288 sp--;
c1a7368a 289 s[sp] &= s[sp + 1];
1da177e4
LT		 290 break;
291 case CEXPR_OR:
292 BUG_ON(sp < 1);
293 sp--;
c1a7368a 294 s[sp] |= s[sp + 1];
1da177e4
LT		 295 break;
296 case CEXPR_ATTR:
c1a7368a 297 if (sp == (CEXPR_MAXDEPTH - 1))
1da177e4
LT		 298 return 0;
299 switch (e->attr) {
300 case CEXPR_USER:
301 val1 = scontext->user;
302 val2 = tcontext->user;
303 break;
304 case CEXPR_TYPE:
305 val1 = scontext->type;
306 val2 = tcontext->type;
307 break;
308 case CEXPR_ROLE:
309 val1 = scontext->role;
310 val2 = tcontext->role;
aa8e712c
SS		 311 r1 = policydb->role_val_to_struct[val1 - 1];
312 r2 = policydb->role_val_to_struct[val2 - 1];
1da177e4
LT		 313 switch (e->op) {
314 case CEXPR_DOM:
315 s[++sp] = ebitmap_get_bit(&r1->dominates,
316 val2 - 1);
317 continue;
318 case CEXPR_DOMBY:
319 s[++sp] = ebitmap_get_bit(&r2->dominates,
320 val1 - 1);
321 continue;
322 case CEXPR_INCOMP:
5d55a345
EP		 323 s[++sp] = (!ebitmap_get_bit(&r1->dominates,
324 val2 - 1) &&
325 !ebitmap_get_bit(&r2->dominates,
326 val1 - 1));
1da177e4
LT		 327 continue;
328 default:
329 break;
330 }
331 break;
332 case CEXPR_L1L2:
333 l1 = &(scontext->range.level[0]);
334 l2 = &(tcontext->range.level[0]);
335 goto mls_ops;
336 case CEXPR_L1H2:
337 l1 = &(scontext->range.level[0]);
338 l2 = &(tcontext->range.level[1]);
339 goto mls_ops;
340 case CEXPR_H1L2:
341 l1 = &(scontext->range.level[1]);
342 l2 = &(tcontext->range.level[0]);
343 goto mls_ops;
344 case CEXPR_H1H2:
345 l1 = &(scontext->range.level[1]);
346 l2 = &(tcontext->range.level[1]);
347 goto mls_ops;
348 case CEXPR_L1H1:
349 l1 = &(scontext->range.level[0]);
350 l2 = &(scontext->range.level[1]);
351 goto mls_ops;
352 case CEXPR_L2H2:
353 l1 = &(tcontext->range.level[0]);
354 l2 = &(tcontext->range.level[1]);
355 goto mls_ops;
356mls_ops:
357 switch (e->op) {
358 case CEXPR_EQ:
359 s[++sp] = mls_level_eq(l1, l2);
360 continue;
361 case CEXPR_NEQ:
362 s[++sp] = !mls_level_eq(l1, l2);
363 continue;
364 case CEXPR_DOM:
365 s[++sp] = mls_level_dom(l1, l2);
366 continue;
367 case CEXPR_DOMBY:
368 s[++sp] = mls_level_dom(l2, l1);
369 continue;
370 case CEXPR_INCOMP:
371 s[++sp] = mls_level_incomp(l2, l1);
372 continue;
373 default:
374 BUG();
375 return 0;
376 }
377 break;
378 default:
379 BUG();
380 return 0;
381 }
382
383 switch (e->op) {
384 case CEXPR_EQ:
385 s[++sp] = (val1 == val2);
386 break;
387 case CEXPR_NEQ:
388 s[++sp] = (val1 != val2);
389 break;
390 default:
391 BUG();
392 return 0;
393 }
394 break;
395 case CEXPR_NAMES:
396 if (sp == (CEXPR_MAXDEPTH-1))
397 return 0;
398 c = scontext;
399 if (e->attr & CEXPR_TARGET)
400 c = tcontext;
401 else if (e->attr & CEXPR_XTARGET) {
402 c = xcontext;
403 if (!c) {
404 BUG();
405 return 0;
406 }
407 }
408 if (e->attr & CEXPR_USER)
409 val1 = c->user;
410 else if (e->attr & CEXPR_ROLE)
411 val1 = c->role;
412 else if (e->attr & CEXPR_TYPE)
413 val1 = c->type;
414 else {
415 BUG();
416 return 0;
417 }
418
419 switch (e->op) {
420 case CEXPR_EQ:
421 s[++sp] = ebitmap_get_bit(&e->names, val1 - 1);
422 break;
423 case CEXPR_NEQ:
424 s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1);
425 break;
426 default:
427 BUG();
428 return 0;
429 }
430 break;
431 default:
432 BUG();
433 return 0;
434 }
435 }
436
437 BUG_ON(sp != 0);
438 return s[0];
439}
440
44c2d9bd
KK		 441/*
442 * security_dump_masked_av - dumps masked permissions during
443 * security_compute_av due to RBAC, MLS/Constraint and Type bounds.
444 */
445static int dump_masked_av_helper(void *k, void *d, void *args)
446{
447 struct perm_datum *pdatum = d;
448 char **permission_names = args;
449
450 BUG_ON(pdatum->value < 1 || pdatum->value > 32);
451
452 permission_names[pdatum->value - 1] = (char *)k;
453
454 return 0;
455}
456
aa8e712c
SS		 457static void security_dump_masked_av(struct policydb *policydb,
458 struct context *scontext,
44c2d9bd
KK		 459 struct context *tcontext,
460 u16 tclass,
461 u32 permissions,
462 const char *reason)
463{
464 struct common_datum *common_dat;
465 struct class_datum *tclass_dat;
466 struct audit_buffer *ab;
467 char *tclass_name;
468 char *scontext_name = NULL;
469 char *tcontext_name = NULL;
470 char *permission_names[32];
2da5d31b
JM		 471 int index;
472 u32 length;
44c2d9bd
KK		 473 bool need_comma = false;
474
475 if (!permissions)
476 return;
477
aa8e712c
SS		 478 tclass_name = sym_name(policydb, SYM_CLASSES, tclass - 1);
479 tclass_dat = policydb->class_val_to_struct[tclass - 1];
44c2d9bd
KK		 480 common_dat = tclass_dat->comdatum;
481
482 /* init permission_names */
483 if (common_dat &&
484 hashtab_map(common_dat->permissions.table,
485 dump_masked_av_helper, permission_names) < 0)
486 goto out;
487
488 if (hashtab_map(tclass_dat->permissions.table,
489 dump_masked_av_helper, permission_names) < 0)
490 goto out;
491
492 /* get scontext/tcontext in text form */
aa8e712c 493 if (context_struct_to_string(policydb, scontext,
44c2d9bd
KK		 494 &scontext_name, &length) < 0)
495 goto out;
496
aa8e712c 497 if (context_struct_to_string(policydb, tcontext,
44c2d9bd
KK		 498 &tcontext_name, &length) < 0)
499 goto out;
500
501 /* audit a message */
cdfb6b34 502 ab = audit_log_start(audit_context(),
44c2d9bd
KK		 503 GFP_ATOMIC, AUDIT_SELINUX_ERR);
504 if (!ab)
505 goto out;
506
507 audit_log_format(ab, "op=security_compute_av reason=%s "
508 "scontext=%s tcontext=%s tclass=%s perms=",
509 reason, scontext_name, tcontext_name, tclass_name);
510
511 for (index = 0; index < 32; index++) {
512 u32 mask = (1 << index);
513
514 if ((mask & permissions) == 0)
515 continue;
516
517 audit_log_format(ab, "%s%s",
518 need_comma ? "," : "",
519 permission_names[index]
520 ? permission_names[index] : "????");
521 need_comma = true;
522 }
523 audit_log_end(ab);
524out:
525 /* release scontext/tcontext */
526 kfree(tcontext_name);
527 kfree(scontext_name);
528
529 return;
530}
531
d9250dea
KK		 532/*
533 * security_boundary_permission - drops violated permissions
534 * on boundary constraint.
535 */
aa8e712c
SS		 536static void type_attribute_bounds_av(struct policydb *policydb,
537 struct context *scontext,
d9250dea
KK		 538 struct context *tcontext,
539 u16 tclass,
d9250dea
KK		 540 struct av_decision *avd)
541{
2ae3ba39 542 struct context lo_scontext;
7ea59202 543 struct context lo_tcontext, *tcontextp = tcontext;
2ae3ba39 544 struct av_decision lo_avd;
23bdecb0
EP		 545 struct type_datum *source;
546 struct type_datum *target;
2ae3ba39 547 u32 masked = 0;
d9250dea 548
aa8e712c 549 source = flex_array_get_ptr(policydb->type_val_to_struct_array,
23bdecb0
EP		 550 scontext->type - 1);
551 BUG_ON(!source);
552
7ea59202
SS		 553 if (!source->bounds)
554 return;
555
aa8e712c 556 target = flex_array_get_ptr(policydb->type_val_to_struct_array,
23bdecb0
EP		 557 tcontext->type - 1);
558 BUG_ON(!target);
559
7ea59202 560 memset(&lo_avd, 0, sizeof(lo_avd));
d9250dea 561
7ea59202
SS		 562 memcpy(&lo_scontext, scontext, sizeof(lo_scontext));
563 lo_scontext.type = source->bounds;
2ae3ba39
KK		 564
565 if (target->bounds) {
2ae3ba39
KK		 566 memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext));
567 lo_tcontext.type = target->bounds;
7ea59202 568 tcontextp = &lo_tcontext;
2ae3ba39
KK		 569 }
570
aa8e712c 571 context_struct_compute_av(policydb, &lo_scontext,
7ea59202
SS		 572 tcontextp,
573 tclass,
574 &lo_avd,
575 NULL);
2ae3ba39 576
7ea59202 577 masked = ~lo_avd.allowed & avd->allowed;
d9250dea 578
7ea59202
SS		 579 if (likely(!masked))
580 return; /* no masked permission */
d9250dea 581
7ea59202
SS		 582 /* mask violated permissions */
583 avd->allowed &= ~masked;
584
585 /* audit masked permissions */
aa8e712c 586 security_dump_masked_av(policydb, scontext, tcontext,
7ea59202 587 tclass, masked, "bounds");
d9250dea
KK		 588}
589
1da177e4 590/*
fa1aa143
JVS		 591 * flag which drivers have permissions
592 * only looking for ioctl based extended permssions
593 */
594void services_compute_xperms_drivers(
595 struct extended_perms *xperms,
596 struct avtab_node *node)
597{
598 unsigned int i;
599
600 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) {
601 /* if one or more driver has all permissions allowed */
602 for (i = 0; i < ARRAY_SIZE(xperms->drivers.p); i++)
603 xperms->drivers.p[i] |= node->datum.u.xperms->perms.p[i];
604 } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) {
605 /* if allowing permissions within a driver */
606 security_xperm_set(xperms->drivers.p,
607 node->datum.u.xperms->driver);
608 }
609
610 /* If no ioctl commands are allowed, ignore auditallow and auditdeny */
611 if (node->key.specified & AVTAB_XPERMS_ALLOWED)
612 xperms->len = 1;
613}
614
615/*
616 * Compute access vectors and extended permissions based on a context
617 * structure pair for the permissions in a particular class.
1da177e4 618 */
aa8e712c
SS		 619static void context_struct_compute_av(struct policydb *policydb,
620 struct context *scontext,
621 struct context *tcontext,
622 u16 tclass,
623 struct av_decision *avd,
624 struct extended_perms *xperms)
1da177e4
LT		 625{
626 struct constraint_node *constraint;
627 struct role_allow *ra;
628 struct avtab_key avkey;
782ebb99 629 struct avtab_node *node;
1da177e4 630 struct class_datum *tclass_datum;
782ebb99
SS		 631 struct ebitmap *sattr, *tattr;
632 struct ebitmap_node *snode, *tnode;
633 unsigned int i, j;
1da177e4 634
1da177e4 635 avd->allowed = 0;
1da177e4
LT		 636 avd->auditallow = 0;
637 avd->auditdeny = 0xffffffff;
fa1aa143
JVS		 638 if (xperms) {
639 memset(&xperms->drivers, 0, sizeof(xperms->drivers));
640 xperms->len = 0;
641 }
1da177e4 642
aa8e712c 643 if (unlikely(!tclass || tclass > policydb->p_classes.nprim)) {
c6d3aaa4 644 if (printk_ratelimit())
b54c85c1 645 pr_warn("SELinux: Invalid class %hu\n", tclass);
19439d05 646 return;
c6d3aaa4 647 }
3f12070e 648
aa8e712c 649 tclass_datum = policydb->class_val_to_struct[tclass - 1];
3f12070e 650
1da177e4
LT		 651 /*
652 * If a specific type enforcement rule was defined for
653 * this permission check, then use it.
654 */
1da177e4 655 avkey.target_class = tclass;
fa1aa143 656 avkey.specified = AVTAB_AV | AVTAB_XPERMS;
aa8e712c
SS		 657 sattr = flex_array_get(policydb->type_attr_map_array,
658 scontext->type - 1);
6371dcd3 659 BUG_ON(!sattr);
aa8e712c
SS		 660 tattr = flex_array_get(policydb->type_attr_map_array,
661 tcontext->type - 1);
6371dcd3 662 BUG_ON(!tattr);
9fe79ad1
KK		 663 ebitmap_for_each_positive_bit(sattr, snode, i) {
664 ebitmap_for_each_positive_bit(tattr, tnode, j) {
782ebb99
SS		 665 avkey.source_type = i + 1;
666 avkey.target_type = j + 1;
aa8e712c
SS		 667 for (node = avtab_search_node(&policydb->te_avtab,
668 &avkey);
dbc74c65 669 node;
782ebb99
SS		 670 node = avtab_search_node_next(node, avkey.specified)) {
671 if (node->key.specified == AVTAB_ALLOWED)
fa1aa143 672 avd->allowed |= node->datum.u.data;
782ebb99 673 else if (node->key.specified == AVTAB_AUDITALLOW)
fa1aa143 674 avd->auditallow |= node->datum.u.data;
782ebb99 675 else if (node->key.specified == AVTAB_AUDITDENY)
fa1aa143
JVS		 676 avd->auditdeny &= node->datum.u.data;
677 else if (xperms && (node->key.specified & AVTAB_XPERMS))
678 services_compute_xperms_drivers(xperms, node);
782ebb99 679 }
1da177e4 680
782ebb99 681 /* Check conditional av table for additional permissions */
aa8e712c 682 cond_compute_av(&policydb->te_cond_avtab, &avkey,
fa1aa143 683 avd, xperms);
782ebb99
SS		 684
685 }
686 }
1da177e4
LT		 687
688 /*
689 * Remove any permissions prohibited by a constraint (this includes
690 * the MLS policy).
691 */
692 constraint = tclass_datum->constraints;
693 while (constraint) {
694 if ((constraint->permissions & (avd->allowed)) &&
aa8e712c 695 !constraint_expr_eval(policydb, scontext, tcontext, NULL,
1da177e4 696 constraint->expr)) {
caabbdc0 697 avd->allowed &= ~(constraint->permissions);
1da177e4
LT		 698 }
699 constraint = constraint->next;
700 }
701
702 /*
703 * If checking process transition permission and the
704 * role is changing, then check the (current_role, new_role)
705 * pair.
706 */
aa8e712c
SS		 707 if (tclass == policydb->process_class &&
708 (avd->allowed & policydb->process_trans_perms) &&
1da177e4 709 scontext->role != tcontext->role) {
aa8e712c 710 for (ra = policydb->role_allow; ra; ra = ra->next) {
1da177e4
LT		 711 if (scontext->role == ra->role &&
712 tcontext->role == ra->new_role)
713 break;
714 }
715 if (!ra)
aa8e712c 716 avd->allowed &= ~policydb->process_trans_perms;
1da177e4
LT		 717 }
718
d9250dea
KK		 719 /*
720 * If the given source and target types have boundary
721 * constraint, lazy checks have to mask any violated
722 * permission and notice it to userspace via audit.
723 */
aa8e712c 724 type_attribute_bounds_av(policydb, scontext, tcontext,
19439d05 725 tclass, avd);
1da177e4
LT		 726}
727
aa8e712c
SS		 728static int security_validtrans_handle_fail(struct selinux_state *state,
729 struct context *ocontext,
5d55a345
EP		 730 struct context *ncontext,
731 struct context *tcontext,
732 u16 tclass)
1da177e4 733{
aa8e712c 734 struct policydb *p = &state->ss->policydb;
1da177e4
LT		 735 char *o = NULL, *n = NULL, *t = NULL;
736 u32 olen, nlen, tlen;
737
aa8e712c 738 if (context_struct_to_string(p, ocontext, &o, &olen))
1da177e4 739 goto out;
aa8e712c 740 if (context_struct_to_string(p, ncontext, &n, &nlen))
1da177e4 741 goto out;
aa8e712c 742 if (context_struct_to_string(p, tcontext, &t, &tlen))
1da177e4 743 goto out;
cdfb6b34 744 audit_log(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR,
4093a844 745 "op=security_validate_transition seresult=denied"
5d55a345 746 " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s",
aa8e712c 747 o, n, t, sym_name(p, SYM_CLASSES, tclass-1));
1da177e4
LT		 748out:
749 kfree(o);
750 kfree(n);
751 kfree(t);
752
e5a5ca96 753 if (!enforcing_enabled(state))
1da177e4
LT		 754 return 0;
755 return -EPERM;
756}
757
aa8e712c
SS		 758static int security_compute_validatetrans(struct selinux_state *state,
759 u32 oldsid, u32 newsid, u32 tasksid,
f9df6458 760 u16 orig_tclass, bool user)
1da177e4 761{
aa8e712c
SS		 762 struct policydb *policydb;
763 struct sidtab *sidtab;
1da177e4
LT		 764 struct context *ocontext;
765 struct context *ncontext;
766 struct context *tcontext;
767 struct class_datum *tclass_datum;
768 struct constraint_node *constraint;
c6d3aaa4 769 u16 tclass;
1da177e4
LT		 770 int rc = 0;
771
aa8e712c
SS		 772
773 if (!state->initialized)
1da177e4
LT		 774 return 0;
775
aa8e712c
SS		 776 read_lock(&state->ss->policy_rwlock);
777
778 policydb = &state->ss->policydb;
779 sidtab = &state->ss->sidtab;
1da177e4 780
f9df6458 781 if (!user)
aa8e712c 782 tclass = unmap_class(&state->ss->map, orig_tclass);
f9df6458
AP		 783 else
784 tclass = orig_tclass;
c6d3aaa4 785
aa8e712c 786 if (!tclass || tclass > policydb->p_classes.nprim) {
1da177e4
LT		 787 rc = -EINVAL;
788 goto out;
789 }
aa8e712c 790 tclass_datum = policydb->class_val_to_struct[tclass - 1];
1da177e4 791
aa8e712c 792 ocontext = sidtab_search(sidtab, oldsid);
1da177e4 793 if (!ocontext) {
b54c85c1 794 pr_err("SELinux: %s: unrecognized SID %d\n",
744ba35e 795 __func__, oldsid);
1da177e4
LT		 796 rc = -EINVAL;
797 goto out;
798 }
799
aa8e712c 800 ncontext = sidtab_search(sidtab, newsid);
1da177e4 801 if (!ncontext) {
b54c85c1 802 pr_err("SELinux: %s: unrecognized SID %d\n",
744ba35e 803 __func__, newsid);
1da177e4
LT		 804 rc = -EINVAL;
805 goto out;
806 }
807
aa8e712c 808 tcontext = sidtab_search(sidtab, tasksid);
1da177e4 809 if (!tcontext) {
b54c85c1 810 pr_err("SELinux: %s: unrecognized SID %d\n",
744ba35e 811 __func__, tasksid);
1da177e4
LT		 812 rc = -EINVAL;
813 goto out;
814 }
815
816 constraint = tclass_datum->validatetrans;
817 while (constraint) {
aa8e712c
SS		 818 if (!constraint_expr_eval(policydb, ocontext, ncontext,
819 tcontext, constraint->expr)) {
f9df6458
AP		 820 if (user)
821 rc = -EPERM;
822 else
aa8e712c
SS		 823 rc = security_validtrans_handle_fail(state,
824 ocontext,
f9df6458
AP		 825 ncontext,
826 tcontext,
827 tclass);
1da177e4
LT		 828 goto out;
829 }
830 constraint = constraint->next;
831 }
832
833out:
aa8e712c 834 read_unlock(&state->ss->policy_rwlock);
1da177e4
LT		 835 return rc;
836}
837
aa8e712c
SS		 838int security_validate_transition_user(struct selinux_state *state,
839 u32 oldsid, u32 newsid, u32 tasksid,
840 u16 tclass)
f9df6458 841{
aa8e712c
SS		 842 return security_compute_validatetrans(state, oldsid, newsid, tasksid,
843 tclass, true);
f9df6458
AP		 844}
845
aa8e712c
SS		 846int security_validate_transition(struct selinux_state *state,
847 u32 oldsid, u32 newsid, u32 tasksid,
f9df6458
AP		 848 u16 orig_tclass)
849{
aa8e712c
SS		 850 return security_compute_validatetrans(state, oldsid, newsid, tasksid,
851 orig_tclass, false);
f9df6458
AP		 852}
853
d9250dea
KK		 854/*
855 * security_bounded_transition - check whether the given
856 * transition is directed to bounded, or not.
857 * It returns 0, if @newsid is bounded by @oldsid.
858 * Otherwise, it returns error code.
859 *
860 * @oldsid : current security identifier
861 * @newsid : destinated security identifier
862 */
aa8e712c
SS		 863int security_bounded_transition(struct selinux_state *state,
864 u32 old_sid, u32 new_sid)
d9250dea 865{
aa8e712c
SS		 866 struct policydb *policydb;
867 struct sidtab *sidtab;
d9250dea
KK		 868 struct context *old_context, *new_context;
869 struct type_datum *type;
870 int index;
4b02b524 871 int rc;
d9250dea 872
aa8e712c 873 if (!state->initialized)
4b14752e
PM		 874 return 0;
875
aa8e712c
SS		 876 read_lock(&state->ss->policy_rwlock);
877
878 policydb = &state->ss->policydb;
879 sidtab = &state->ss->sidtab;
d9250dea 880
4b02b524 881 rc = -EINVAL;
aa8e712c 882 old_context = sidtab_search(sidtab, old_sid);
d9250dea 883 if (!old_context) {
b54c85c1 884 pr_err("SELinux: %s: unrecognized SID %u\n",
d9250dea
KK		 885 __func__, old_sid);
886 goto out;
887 }
888
4b02b524 889 rc = -EINVAL;
aa8e712c 890 new_context = sidtab_search(sidtab, new_sid);
d9250dea 891 if (!new_context) {
b54c85c1 892 pr_err("SELinux: %s: unrecognized SID %u\n",
d9250dea
KK		 893 __func__, new_sid);
894 goto out;
895 }
896
4b02b524 897 rc = 0;
af901ca1 898 /* type/domain unchanged */
4b02b524 899 if (old_context->type == new_context->type)
d9250dea 900 goto out;
d9250dea
KK		 901
902 index = new_context->type;
903 while (true) {
aa8e712c 904 type = flex_array_get_ptr(policydb->type_val_to_struct_array,
23bdecb0 905 index - 1);
d9250dea
KK		 906 BUG_ON(!type);
907
908 /* not bounded anymore */
4b02b524
EP		 909 rc = -EPERM;
910 if (!type->bounds)
d9250dea 911 break;
d9250dea
KK		 912
913 /* @newsid is bounded by @oldsid */
4b02b524
EP		 914 rc = 0;
915 if (type->bounds == old_context->type)
d9250dea 916 break;
4b02b524 917
d9250dea
KK		 918 index = type->bounds;
919 }
44c2d9bd
KK		 920
921 if (rc) {
922 char *old_name = NULL;
923 char *new_name = NULL;
2da5d31b 924 u32 length;
44c2d9bd 925
aa8e712c 926 if (!context_struct_to_string(policydb, old_context,
44c2d9bd 927 &old_name, &length) &&
aa8e712c 928 !context_struct_to_string(policydb, new_context,
44c2d9bd 929 &new_name, &length)) {
cdfb6b34 930 audit_log(audit_context(),
44c2d9bd
KK		 931 GFP_ATOMIC, AUDIT_SELINUX_ERR,
932 "op=security_bounded_transition "
4093a844 933 "seresult=denied "
44c2d9bd
KK		 934 "oldcontext=%s newcontext=%s",
935 old_name, new_name);
936 }
937 kfree(new_name);
938 kfree(old_name);
939 }
d9250dea 940out:
aa8e712c 941 read_unlock(&state->ss->policy_rwlock);
d9250dea
KK		 942
943 return rc;
944}
945
aa8e712c 946static void avd_init(struct selinux_state *state, struct av_decision *avd)
c6d3aaa4 947{
19439d05
SS		 948 avd->allowed = 0;
949 avd->auditallow = 0;
950 avd->auditdeny = 0xffffffff;
aa8e712c 951 avd->seqno = state->ss->latest_granting;
19439d05 952 avd->flags = 0;
c6d3aaa4
SS		 953}
954
fa1aa143
JVS		 955void services_compute_xperms_decision(struct extended_perms_decision *xpermd,
956 struct avtab_node *node)
957{
958 unsigned int i;
959
960 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) {
961 if (xpermd->driver != node->datum.u.xperms->driver)
962 return;
963 } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) {
964 if (!security_xperm_test(node->datum.u.xperms->perms.p,
965 xpermd->driver))
966 return;
967 } else {
968 BUG();
969 }
970
971 if (node->key.specified == AVTAB_XPERMS_ALLOWED) {
972 xpermd->used |= XPERMS_ALLOWED;
973 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) {
974 memset(xpermd->allowed->p, 0xff,
975 sizeof(xpermd->allowed->p));
976 }
977 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) {
978 for (i = 0; i < ARRAY_SIZE(xpermd->allowed->p); i++)
979 xpermd->allowed->p[i] |=
980 node->datum.u.xperms->perms.p[i];
981 }
982 } else if (node->key.specified == AVTAB_XPERMS_AUDITALLOW) {
983 xpermd->used |= XPERMS_AUDITALLOW;
984 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) {
985 memset(xpermd->auditallow->p, 0xff,
986 sizeof(xpermd->auditallow->p));
987 }
988 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) {
989 for (i = 0; i < ARRAY_SIZE(xpermd->auditallow->p); i++)
990 xpermd->auditallow->p[i] |=
991 node->datum.u.xperms->perms.p[i];
992 }
993 } else if (node->key.specified == AVTAB_XPERMS_DONTAUDIT) {
994 xpermd->used |= XPERMS_DONTAUDIT;
995 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) {
996 memset(xpermd->dontaudit->p, 0xff,
997 sizeof(xpermd->dontaudit->p));
998 }
999 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) {
1000 for (i = 0; i < ARRAY_SIZE(xpermd->dontaudit->p); i++)
1001 xpermd->dontaudit->p[i] |=
1002 node->datum.u.xperms->perms.p[i];
1003 }
1004 } else {
1005 BUG();
1006 }
1007}
1008
aa8e712c
SS		 1009void security_compute_xperms_decision(struct selinux_state *state,
1010 u32 ssid,
1011 u32 tsid,
1012 u16 orig_tclass,
1013 u8 driver,
1014 struct extended_perms_decision *xpermd)
fa1aa143 1015{
aa8e712c
SS		 1016 struct policydb *policydb;
1017 struct sidtab *sidtab;
fa1aa143
JVS		 1018 u16 tclass;
1019 struct context *scontext, *tcontext;
1020 struct avtab_key avkey;
1021 struct avtab_node *node;
1022 struct ebitmap *sattr, *tattr;
1023 struct ebitmap_node *snode, *tnode;
1024 unsigned int i, j;
1025
1026 xpermd->driver = driver;
1027 xpermd->used = 0;
1028 memset(xpermd->allowed->p, 0, sizeof(xpermd->allowed->p));
1029 memset(xpermd->auditallow->p, 0, sizeof(xpermd->auditallow->p));
1030 memset(xpermd->dontaudit->p, 0, sizeof(xpermd->dontaudit->p));
1031
aa8e712c
SS		 1032 read_lock(&state->ss->policy_rwlock);
1033 if (!state->initialized)
fa1aa143
JVS		 1034 goto allow;
1035
aa8e712c
SS		 1036 policydb = &state->ss->policydb;
1037 sidtab = &state->ss->sidtab;
1038
1039 scontext = sidtab_search(sidtab, ssid);
fa1aa143 1040 if (!scontext) {
b54c85c1 1041 pr_err("SELinux: %s: unrecognized SID %d\n",
fa1aa143
JVS		 1042 __func__, ssid);
1043 goto out;
1044 }
1045
aa8e712c 1046 tcontext = sidtab_search(sidtab, tsid);
fa1aa143 1047 if (!tcontext) {
b54c85c1 1048 pr_err("SELinux: %s: unrecognized SID %d\n",
fa1aa143
JVS		 1049 __func__, tsid);
1050 goto out;
1051 }
1052
aa8e712c 1053 tclass = unmap_class(&state->ss->map, orig_tclass);
fa1aa143 1054 if (unlikely(orig_tclass && !tclass)) {
aa8e712c 1055 if (policydb->allow_unknown)
fa1aa143
JVS		 1056 goto allow;
1057 goto out;
1058 }
1059
1060
aa8e712c 1061 if (unlikely(!tclass || tclass > policydb->p_classes.nprim)) {
fa1aa143
JVS		 1062 pr_warn_ratelimited("SELinux: Invalid class %hu\n", tclass);
1063 goto out;
1064 }
1065
1066 avkey.target_class = tclass;
1067 avkey.specified = AVTAB_XPERMS;
aa8e712c 1068 sattr = flex_array_get(policydb->type_attr_map_array,
fa1aa143
JVS		 1069 scontext->type - 1);
1070 BUG_ON(!sattr);
aa8e712c 1071 tattr = flex_array_get(policydb->type_attr_map_array,
fa1aa143
JVS		 1072 tcontext->type - 1);
1073 BUG_ON(!tattr);
1074 ebitmap_for_each_positive_bit(sattr, snode, i) {
1075 ebitmap_for_each_positive_bit(tattr, tnode, j) {
1076 avkey.source_type = i + 1;
1077 avkey.target_type = j + 1;
aa8e712c
SS		 1078 for (node = avtab_search_node(&policydb->te_avtab,
1079 &avkey);
fa1aa143
JVS		 1080 node;
1081 node = avtab_search_node_next(node, avkey.specified))
1082 services_compute_xperms_decision(xpermd, node);
1083
aa8e712c 1084 cond_compute_xperms(&policydb->te_cond_avtab,
fa1aa143
JVS		 1085 &avkey, xpermd);
1086 }
1087 }
1088out:
aa8e712c 1089 read_unlock(&state->ss->policy_rwlock);
fa1aa143
JVS		 1090 return;
1091allow:
1092 memset(xpermd->allowed->p, 0xff, sizeof(xpermd->allowed->p));
1093 goto out;
1094}
19439d05 1095
1da177e4
LT		 1096/**
1097 * security_compute_av - Compute access vector decisions.
1098 * @ssid: source security identifier
1099 * @tsid: target security identifier
1100 * @tclass: target security class
1da177e4 1101 * @avd: access vector decisions
fa1aa143 1102 * @xperms: extended permissions
1da177e4
LT		 1103 *
1104 * Compute a set of access vector decisions based on the
1105 * SID pair (@ssid, @tsid) for the permissions in @tclass.
1da177e4 1106 */
aa8e712c
SS		 1107void security_compute_av(struct selinux_state *state,
1108 u32 ssid,
19439d05
SS		 1109 u32 tsid,
1110 u16 orig_tclass,
fa1aa143
JVS		 1111 struct av_decision *avd,
1112 struct extended_perms *xperms)
1da177e4 1113{
aa8e712c
SS		 1114 struct policydb *policydb;
1115 struct sidtab *sidtab;
c6d3aaa4 1116 u16 tclass;
19439d05 1117 struct context *scontext = NULL, *tcontext = NULL;
c6d3aaa4 1118
aa8e712c
SS		 1119 read_lock(&state->ss->policy_rwlock);
1120 avd_init(state, avd);
fa1aa143 1121 xperms->len = 0;
aa8e712c 1122 if (!state->initialized)
c6d3aaa4
SS		 1123 goto allow;
1124
aa8e712c
SS		 1125 policydb = &state->ss->policydb;
1126 sidtab = &state->ss->sidtab;
1127
1128 scontext = sidtab_search(sidtab, ssid);
19439d05 1129 if (!scontext) {
b54c85c1 1130 pr_err("SELinux: %s: unrecognized SID %d\n",
19439d05
SS		 1131 __func__, ssid);
1132 goto out;
1133 }
1134
1135 /* permissive domain? */
aa8e712c 1136 if (ebitmap_get_bit(&policydb->permissive_map, scontext->type))
19439d05
SS		 1137 avd->flags |= AVD_FLAGS_PERMISSIVE;
1138
aa8e712c 1139 tcontext = sidtab_search(sidtab, tsid);
19439d05 1140 if (!tcontext) {
b54c85c1 1141 pr_err("SELinux: %s: unrecognized SID %d\n",
19439d05
SS		 1142 __func__, tsid);
1143 goto out;
1144 }
1145
aa8e712c 1146 tclass = unmap_class(&state->ss->map, orig_tclass);
c6d3aaa4 1147 if (unlikely(orig_tclass && !tclass)) {
aa8e712c 1148 if (policydb->allow_unknown)
c6d3aaa4 1149 goto allow;
b7f3008a 1150 goto out;
c6d3aaa4 1151 }
aa8e712c
SS		 1152 context_struct_compute_av(policydb, scontext, tcontext, tclass, avd,
1153 xperms);
1154 map_decision(&state->ss->map, orig_tclass, avd,
1155 policydb->allow_unknown);
b7f3008a 1156out:
aa8e712c 1157 read_unlock(&state->ss->policy_rwlock);
19439d05 1158 return;
c6d3aaa4
SS		 1159allow:
1160 avd->allowed = 0xffffffff;
b7f3008a 1161 goto out;
c6d3aaa4
SS		 1162}
1163
aa8e712c
SS		 1164void security_compute_av_user(struct selinux_state *state,
1165 u32 ssid,
19439d05
SS		 1166 u32 tsid,
1167 u16 tclass,
1168 struct av_decision *avd)
c6d3aaa4 1169{
aa8e712c
SS		 1170 struct policydb *policydb;
1171 struct sidtab *sidtab;
19439d05 1172 struct context *scontext = NULL, *tcontext = NULL;
1da177e4 1173
aa8e712c
SS		 1174 read_lock(&state->ss->policy_rwlock);
1175 avd_init(state, avd);
1176 if (!state->initialized)
19439d05
SS		 1177 goto allow;
1178
aa8e712c
SS		 1179 policydb = &state->ss->policydb;
1180 sidtab = &state->ss->sidtab;
1181
1182 scontext = sidtab_search(sidtab, ssid);
19439d05 1183 if (!scontext) {
b54c85c1 1184 pr_err("SELinux: %s: unrecognized SID %d\n",
19439d05
SS		 1185 __func__, ssid);
1186 goto out;
1da177e4
LT		 1187 }
1188
19439d05 1189 /* permissive domain? */
aa8e712c 1190 if (ebitmap_get_bit(&policydb->permissive_map, scontext->type))
19439d05
SS		 1191 avd->flags |= AVD_FLAGS_PERMISSIVE;
1192
aa8e712c 1193 tcontext = sidtab_search(sidtab, tsid);
19439d05 1194 if (!tcontext) {
b54c85c1 1195 pr_err("SELinux: %s: unrecognized SID %d\n",
19439d05
SS		 1196 __func__, tsid);
1197 goto out;
1198 }
1199
1200 if (unlikely(!tclass)) {
aa8e712c 1201 if (policydb->allow_unknown)
19439d05
SS		 1202 goto allow;
1203 goto out;
1204 }
1205
aa8e712c
SS		 1206 context_struct_compute_av(policydb, scontext, tcontext, tclass, avd,
1207 NULL);
19439d05 1208 out:
aa8e712c 1209 read_unlock(&state->ss->policy_rwlock);
19439d05
SS		 1210 return;
1211allow:
1212 avd->allowed = 0xffffffff;
1213 goto out;
1da177e4
LT		 1214}
1215
1216/*
1217 * Write the security context string representation of
1218 * the context structure `context' into a dynamically
1219 * allocated string of the correct size. Set `*scontext'
1220 * to point to this string and set `*scontext_len' to
1221 * the length of the string.
1222 */
aa8e712c
SS		 1223static int context_struct_to_string(struct policydb *p,
1224 struct context *context,
1225 char **scontext, u32 *scontext_len)
1da177e4
LT		 1226{
1227 char *scontextp;
1228
d5630b9d
EP		 1229 if (scontext)
1230 *scontext = NULL;
1da177e4
LT		 1231 *scontext_len = 0;
1232
12b29f34
SS		 1233 if (context->len) {
1234 *scontext_len = context->len;
bb7081ab
EP		 1235 if (scontext) {
1236 *scontext = kstrdup(context->str, GFP_ATOMIC);
1237 if (!(*scontext))
1238 return -ENOMEM;
1239 }
12b29f34
SS		 1240 return 0;
1241 }
1242
1da177e4 1243 /* Compute the size of the context. */
aa8e712c
SS		 1244 *scontext_len += strlen(sym_name(p, SYM_USERS, context->user - 1)) + 1;
1245 *scontext_len += strlen(sym_name(p, SYM_ROLES, context->role - 1)) + 1;
1246 *scontext_len += strlen(sym_name(p, SYM_TYPES, context->type - 1)) + 1;
1247 *scontext_len += mls_compute_context_len(p, context);
1da177e4 1248
d5630b9d
EP		 1249 if (!scontext)
1250 return 0;
1251
1da177e4
LT		 1252 /* Allocate space for the context; caller must free this space. */
1253 scontextp = kmalloc(*scontext_len, GFP_ATOMIC);
5d55a345 1254 if (!scontextp)
1da177e4 1255 return -ENOMEM;
1da177e4
LT		 1256 *scontext = scontextp;
1257
1258 /*
1259 * Copy the user name, role name and type name into the context.
1260 */
9529c788 1261 scontextp += sprintf(scontextp, "%s:%s:%s",
aa8e712c
SS		 1262 sym_name(p, SYM_USERS, context->user - 1),
1263 sym_name(p, SYM_ROLES, context->role - 1),
1264 sym_name(p, SYM_TYPES, context->type - 1));
1da177e4 1265
aa8e712c 1266 mls_sid_to_context(p, context, &scontextp);
1da177e4
LT		 1267
1268 *scontextp = 0;
1269
1270 return 0;
1271}
1272
1273#include "initial_sid_to_string.h"
1274
f0ee2e46
JC		 1275const char *security_get_initial_sid_context(u32 sid)
1276{
1277 if (unlikely(sid > SECINITSID_NUM))
1278 return NULL;
1279 return initial_sid_to_string[sid];
1280}
1281
aa8e712c
SS		 1282static int security_sid_to_context_core(struct selinux_state *state,
1283 u32 sid, char **scontext,
12b29f34 1284 u32 *scontext_len, int force)
1da177e4 1285{
aa8e712c
SS		 1286 struct policydb *policydb;
1287 struct sidtab *sidtab;
1da177e4
LT		 1288 struct context *context;
1289 int rc = 0;
1290
d5630b9d
EP		 1291 if (scontext)
1292 *scontext = NULL;
4f4acf3a
SS		 1293 *scontext_len = 0;
1294
aa8e712c 1295 if (!state->initialized) {
1da177e4
LT		 1296 if (sid <= SECINITSID_NUM) {
1297 char *scontextp;
1298
1299 *scontext_len = strlen(initial_sid_to_string[sid]) + 1;
d5630b9d
EP		 1300 if (!scontext)
1301 goto out;
aa736c36
RV		 1302 scontextp = kmemdup(initial_sid_to_string[sid],
1303 *scontext_len, GFP_ATOMIC);
0cccca06
SH		 1304 if (!scontextp) {
1305 rc = -ENOMEM;
1306 goto out;
1307 }
1da177e4
LT		 1308 *scontext = scontextp;
1309 goto out;
1310 }
b54c85c1 1311 pr_err("SELinux: %s: called before initial "
744ba35e 1312 "load_policy on unknown SID %d\n", __func__, sid);
1da177e4
LT		 1313 rc = -EINVAL;
1314 goto out;
1315 }
aa8e712c
SS		 1316 read_lock(&state->ss->policy_rwlock);
1317 policydb = &state->ss->policydb;
1318 sidtab = &state->ss->sidtab;
12b29f34 1319 if (force)
aa8e712c 1320 context = sidtab_search_force(sidtab, sid);
12b29f34 1321 else
aa8e712c 1322 context = sidtab_search(sidtab, sid);
1da177e4 1323 if (!context) {
b54c85c1 1324 pr_err("SELinux: %s: unrecognized SID %d\n",
744ba35e 1325 __func__, sid);
1da177e4
LT		 1326 rc = -EINVAL;
1327 goto out_unlock;
1328 }
aa8e712c
SS		 1329 rc = context_struct_to_string(policydb, context, scontext,
1330 scontext_len);
1da177e4 1331out_unlock:
aa8e712c 1332 read_unlock(&state->ss->policy_rwlock);
1da177e4
LT		 1333out:
1334 return rc;
1335
1336}
1337
12b29f34
SS		 1338/**
1339 * security_sid_to_context - Obtain a context for a given SID.
1340 * @sid: security identifier, SID
1341 * @scontext: security context
1342 * @scontext_len: length in bytes
1343 *
1344 * Write the string representation of the context associated with @sid
1345 * into a dynamically allocated string of the correct size. Set @scontext
1346 * to point to this string and set @scontext_len to the length of the string.
1347 */
aa8e712c
SS		 1348int security_sid_to_context(struct selinux_state *state,
1349 u32 sid, char **scontext, u32 *scontext_len)
1da177e4 1350{
aa8e712c
SS		 1351 return security_sid_to_context_core(state, sid, scontext,
1352 scontext_len, 0);
12b29f34
SS		 1353}
1354
aa8e712c
SS		 1355int security_sid_to_context_force(struct selinux_state *state, u32 sid,
1356 char **scontext, u32 *scontext_len)
12b29f34 1357{
aa8e712c
SS		 1358 return security_sid_to_context_core(state, sid, scontext,
1359 scontext_len, 1);
12b29f34
SS		 1360}
1361
9a59daa0
SS		 1362/*
1363 * Caveat: Mutates scontext.
1364 */
12b29f34
SS		 1365static int string_to_context_struct(struct policydb *pol,
1366 struct sidtab *sidtabp,
9a59daa0 1367 char *scontext,
12b29f34 1368 struct context *ctx,
9a59daa0 1369 u32 def_sid)
12b29f34 1370{
1da177e4
LT		 1371 struct role_datum *role;
1372 struct type_datum *typdatum;
1373 struct user_datum *usrdatum;
1374 char *scontextp, *p, oldc;
1375 int rc = 0;
1376
12b29f34 1377 context_init(ctx);
1da177e4 1378
1da177e4
LT		 1379 /* Parse the security context. */
1380
1381 rc = -EINVAL;
9a59daa0 1382 scontextp = (char *) scontext;
1da177e4
LT		 1383
1384 /* Extract the user. */
1385 p = scontextp;
1386 while (*p && *p != ':')
1387 p++;
1388
1389 if (*p == 0)
12b29f34 1390 goto out;
1da177e4
LT		 1391
1392 *p++ = 0;
1393
12b29f34 1394 usrdatum = hashtab_search(pol->p_users.table, scontextp);
1da177e4 1395 if (!usrdatum)
12b29f34 1396 goto out;
1da177e4 1397
12b29f34 1398 ctx->user = usrdatum->value;
1da177e4
LT		 1399
1400 /* Extract role. */
1401 scontextp = p;
1402 while (*p && *p != ':')
1403 p++;
1404
1405 if (*p == 0)
12b29f34 1406 goto out;
1da177e4
LT		 1407
1408 *p++ = 0;
1409
12b29f34 1410 role = hashtab_search(pol->p_roles.table, scontextp);
1da177e4 1411 if (!role)
12b29f34
SS		 1412 goto out;
1413 ctx->role = role->value;
1da177e4
LT		 1414
1415 /* Extract type. */
1416 scontextp = p;
1417 while (*p && *p != ':')
1418 p++;
1419 oldc = *p;
1420 *p++ = 0;
1421
12b29f34 1422 typdatum = hashtab_search(pol->p_types.table, scontextp);
d9250dea 1423 if (!typdatum || typdatum->attribute)
12b29f34 1424 goto out;
1da177e4 1425
12b29f34 1426 ctx->type = typdatum->value;
1da177e4 1427
95ffe194 1428 rc = mls_context_to_sid(pol, oldc, p, ctx, sidtabp, def_sid);
1da177e4 1429 if (rc)
12b29f34 1430 goto out;
1da177e4 1431
1da177e4 1432 /* Check the validity of the new context. */
95ffe194 1433 rc = -EINVAL;
4b02b524 1434 if (!policydb_context_isvalid(pol, ctx))
12b29f34 1435 goto out;
12b29f34
SS		 1436 rc = 0;
1437out:
8e531af9
EP		 1438 if (rc)
1439 context_destroy(ctx);
12b29f34
SS		 1440 return rc;
1441}
1442
aa8e712c
SS		 1443static int security_context_to_sid_core(struct selinux_state *state,
1444 const char *scontext, u32 scontext_len,
12b29f34
SS		 1445 u32 *sid, u32 def_sid, gfp_t gfp_flags,
1446 int force)
1447{
aa8e712c
SS		 1448 struct policydb *policydb;
1449 struct sidtab *sidtab;
9a59daa0 1450 char *scontext2, *str = NULL;
12b29f34
SS		 1451 struct context context;
1452 int rc = 0;
1453
2172fa70
SS		 1454 /* An empty security context is never valid. */
1455 if (!scontext_len)
1456 return -EINVAL;
1457
ef28df55
PM		 1458 /* Copy the string to allow changes and ensure a NUL terminator */
1459 scontext2 = kmemdup_nul(scontext, scontext_len, gfp_flags);
1460 if (!scontext2)
1461 return -ENOMEM;
1462
aa8e712c 1463 if (!state->initialized) {
12b29f34
SS		 1464 int i;
1465
1466 for (i = 1; i < SECINITSID_NUM; i++) {
ef28df55 1467 if (!strcmp(initial_sid_to_string[i], scontext2)) {
12b29f34 1468 *sid = i;
ef28df55 1469 goto out;
12b29f34
SS		 1470 }
1471 }
1472 *sid = SECINITSID_KERNEL;
ef28df55 1473 goto out;
12b29f34
SS		 1474 }
1475 *sid = SECSID_NULL;
1476
9a59daa0
SS		 1477 if (force) {
1478 /* Save another copy for storing in uninterpreted form */
4b02b524 1479 rc = -ENOMEM;
9a59daa0 1480 str = kstrdup(scontext2, gfp_flags);
4b02b524
EP		 1481 if (!str)
1482 goto out;
9a59daa0 1483 }
aa8e712c
SS		 1484 read_lock(&state->ss->policy_rwlock);
1485 policydb = &state->ss->policydb;
1486 sidtab = &state->ss->sidtab;
1487 rc = string_to_context_struct(policydb, sidtab, scontext2,
95ffe194 1488 &context, def_sid);
12b29f34 1489 if (rc == -EINVAL && force) {
9a59daa0 1490 context.str = str;
efe3de79 1491 context.len = strlen(str) + 1;
9a59daa0 1492 str = NULL;
12b29f34 1493 } else if (rc)
4b02b524 1494 goto out_unlock;
aa8e712c 1495 rc = sidtab_context_to_sid(sidtab, &context, sid);
8e531af9 1496 context_destroy(&context);
4b02b524 1497out_unlock:
aa8e712c 1498 read_unlock(&state->ss->policy_rwlock);
4b02b524 1499out:
9a59daa0
SS		 1500 kfree(scontext2);
1501 kfree(str);
1da177e4
LT		 1502 return rc;
1503}
1504
f5c1d5b2
JM		 1505/**
1506 * security_context_to_sid - Obtain a SID for a given security context.
1507 * @scontext: security context
1508 * @scontext_len: length in bytes
1509 * @sid: security identifier, SID
52a4c640 1510 * @gfp: context for the allocation
f5c1d5b2
JM		 1511 *
1512 * Obtains a SID associated with the security context that
1513 * has the string representation specified by @scontext.
1514 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
1515 * memory is available, or 0 on success.
1516 */
aa8e712c
SS		 1517int security_context_to_sid(struct selinux_state *state,
1518 const char *scontext, u32 scontext_len, u32 *sid,
52a4c640 1519 gfp_t gfp)
f5c1d5b2 1520{
aa8e712c 1521 return security_context_to_sid_core(state, scontext, scontext_len,
52a4c640 1522 sid, SECSID_NULL, gfp, 0);
44be2f65
RV		 1523}
1524
aa8e712c
SS		 1525int security_context_str_to_sid(struct selinux_state *state,
1526 const char *scontext, u32 *sid, gfp_t gfp)
44be2f65 1527{
aa8e712c
SS		 1528 return security_context_to_sid(state, scontext, strlen(scontext),
1529 sid, gfp);
f5c1d5b2
JM		 1530}
1531
1532/**
1533 * security_context_to_sid_default - Obtain a SID for a given security context,
1534 * falling back to specified default if needed.
1535 *
1536 * @scontext: security context
1537 * @scontext_len: length in bytes
1538 * @sid: security identifier, SID
d133a960 1539 * @def_sid: default SID to assign on error
f5c1d5b2
JM		 1540 *
1541 * Obtains a SID associated with the security context that
1542 * has the string representation specified by @scontext.
1543 * The default SID is passed to the MLS layer to be used to allow
1544 * kernel labeling of the MLS field if the MLS field is not present
1545 * (for upgrading to MLS without full relabel).
12b29f34 1546 * Implicitly forces adding of the context even if it cannot be mapped yet.
f5c1d5b2
JM		 1547 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
1548 * memory is available, or 0 on success.
1549 */
aa8e712c
SS		 1550int security_context_to_sid_default(struct selinux_state *state,
1551 const char *scontext, u32 scontext_len,
7bf570dc 1552 u32 *sid, u32 def_sid, gfp_t gfp_flags)
f5c1d5b2 1553{
aa8e712c 1554 return security_context_to_sid_core(state, scontext, scontext_len,
12b29f34
SS		 1555 sid, def_sid, gfp_flags, 1);
1556}
1557
aa8e712c
SS		 1558int security_context_to_sid_force(struct selinux_state *state,
1559 const char *scontext, u32 scontext_len,
12b29f34
SS		 1560 u32 *sid)
1561{
aa8e712c 1562 return security_context_to_sid_core(state, scontext, scontext_len,
12b29f34 1563 sid, SECSID_NULL, GFP_KERNEL, 1);
f5c1d5b2
JM		 1564}
1565
1da177e4 1566static int compute_sid_handle_invalid_context(
aa8e712c 1567 struct selinux_state *state,
1da177e4
LT		 1568 struct context *scontext,
1569 struct context *tcontext,
1570 u16 tclass,
1571 struct context *newcontext)
1572{
aa8e712c 1573 struct policydb *policydb = &state->ss->policydb;
1da177e4
LT		 1574 char *s = NULL, *t = NULL, *n = NULL;
1575 u32 slen, tlen, nlen;
1576
aa8e712c 1577 if (context_struct_to_string(policydb, scontext, &s, &slen))
1da177e4 1578 goto out;
aa8e712c 1579 if (context_struct_to_string(policydb, tcontext, &t, &tlen))
1da177e4 1580 goto out;
aa8e712c 1581 if (context_struct_to_string(policydb, newcontext, &n, &nlen))
1da177e4 1582 goto out;
cdfb6b34 1583 audit_log(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR,
4093a844
RGB		 1584 "op=security_compute_sid invalid_context=%s"
1585 " scontext=%s"
1da177e4
LT		 1586 " tcontext=%s"
1587 " tclass=%s",
aa8e712c 1588 n, s, t, sym_name(policydb, SYM_CLASSES, tclass-1));
1da177e4
LT		 1589out:
1590 kfree(s);
1591 kfree(t);
1592 kfree(n);
e5a5ca96 1593 if (!enforcing_enabled(state))
1da177e4
LT		 1594 return 0;
1595 return -EACCES;
1596}
1597
aa8e712c
SS		 1598static void filename_compute_type(struct policydb *policydb,
1599 struct context *newcontext,
2667991f 1600 u32 stype, u32 ttype, u16 tclass,
f50a3ec9 1601 const char *objname)
652bb9b0 1602{
2463c26d
EP		 1603 struct filename_trans ft;
1604 struct filename_trans_datum *otype;
03a4c018
EP		 1605
1606 /*
1607 * Most filename trans rules are going to live in specific directories
1608 * like /dev or /var/run. This bitmap will quickly skip rule searches
1609 * if the ttype does not contain any rules.
1610 */
aa8e712c 1611 if (!ebitmap_get_bit(&policydb->filename_trans_ttypes, ttype))
03a4c018
EP		 1612 return;
1613
2463c26d
EP		 1614 ft.stype = stype;
1615 ft.ttype = ttype;
1616 ft.tclass = tclass;
1617 ft.name = objname;
1618
aa8e712c 1619 otype = hashtab_search(policydb->filename_trans, &ft);
2463c26d
EP		 1620 if (otype)
1621 newcontext->type = otype->otype;
652bb9b0
EP		 1622}
1623
aa8e712c
SS		 1624static int security_compute_sid(struct selinux_state *state,
1625 u32 ssid,
1da177e4 1626 u32 tsid,
c6d3aaa4 1627 u16 orig_tclass,
1da177e4 1628 u32 specified,
f50a3ec9 1629 const char *objname,
c6d3aaa4
SS		 1630 u32 *out_sid,
1631 bool kern)
1da177e4 1632{
aa8e712c
SS		 1633 struct policydb *policydb;
1634 struct sidtab *sidtab;
aa893269 1635 struct class_datum *cladatum = NULL;
1da177e4
LT		 1636 struct context *scontext = NULL, *tcontext = NULL, newcontext;
1637 struct role_trans *roletr = NULL;
1638 struct avtab_key avkey;
1639 struct avtab_datum *avdatum;
1640 struct avtab_node *node;
c6d3aaa4 1641 u16 tclass;
1da177e4 1642 int rc = 0;
6f5317e7 1643 bool sock;
1da177e4 1644
aa8e712c 1645 if (!state->initialized) {
c6d3aaa4
SS		 1646 switch (orig_tclass) {
1647 case SECCLASS_PROCESS: /* kernel value */
1da177e4
LT		 1648 *out_sid = ssid;
1649 break;
1650 default:
1651 *out_sid = tsid;
1652 break;
1653 }
1654 goto out;
1655 }
1656
851f8a69
VY		 1657 context_init(&newcontext);
1658
aa8e712c 1659 read_lock(&state->ss->policy_rwlock);
1da177e4 1660
6f5317e7 1661 if (kern) {
aa8e712c 1662 tclass = unmap_class(&state->ss->map, orig_tclass);
6f5317e7
HC		 1663 sock = security_is_socket_class(orig_tclass);
1664 } else {
c6d3aaa4 1665 tclass = orig_tclass;
aa8e712c
SS		 1666 sock = security_is_socket_class(map_class(&state->ss->map,
1667 tclass));
6f5317e7 1668 }
c6d3aaa4 1669
aa8e712c
SS		 1670 policydb = &state->ss->policydb;
1671 sidtab = &state->ss->sidtab;
1672
1673 scontext = sidtab_search(sidtab, ssid);
1da177e4 1674 if (!scontext) {
b54c85c1 1675 pr_err("SELinux: %s: unrecognized SID %d\n",
744ba35e 1676 __func__, ssid);
1da177e4
LT		 1677 rc = -EINVAL;
1678 goto out_unlock;
1679 }
aa8e712c 1680 tcontext = sidtab_search(sidtab, tsid);
1da177e4 1681 if (!tcontext) {
b54c85c1 1682 pr_err("SELinux: %s: unrecognized SID %d\n",
744ba35e 1683 __func__, tsid);
1da177e4
LT		 1684 rc = -EINVAL;
1685 goto out_unlock;
1686 }
1687
aa8e712c
SS		 1688 if (tclass && tclass <= policydb->p_classes.nprim)
1689 cladatum = policydb->class_val_to_struct[tclass - 1];
aa893269 1690
1da177e4
LT		 1691 /* Set the user identity. */
1692 switch (specified) {
1693 case AVTAB_TRANSITION:
1694 case AVTAB_CHANGE:
aa893269
EP		 1695 if (cladatum && cladatum->default_user == DEFAULT_TARGET) {
1696 newcontext.user = tcontext->user;
1697 } else {
1698 /* notice this gets both DEFAULT_SOURCE and unset */
1699 /* Use the process user identity. */
1700 newcontext.user = scontext->user;
1701 }
1da177e4
LT		 1702 break;
1703 case AVTAB_MEMBER:
1704 /* Use the related object owner. */
1705 newcontext.user = tcontext->user;
1706 break;
1707 }
1708
aa893269
EP		 1709 /* Set the role to default values. */
1710 if (cladatum && cladatum->default_role == DEFAULT_SOURCE) {
1da177e4 1711 newcontext.role = scontext->role;
aa893269
EP		 1712 } else if (cladatum && cladatum->default_role == DEFAULT_TARGET) {
1713 newcontext.role = tcontext->role;
1714 } else {
aa8e712c 1715 if ((tclass == policydb->process_class) || (sock == true))
aa893269
EP		 1716 newcontext.role = scontext->role;
1717 else
1718 newcontext.role = OBJECT_R_VAL;
1719 }
1720
1721 /* Set the type to default values. */
eed7795d 1722 if (cladatum && cladatum->default_type == DEFAULT_SOURCE) {
1da177e4 1723 newcontext.type = scontext->type;
eed7795d 1724 } else if (cladatum && cladatum->default_type == DEFAULT_TARGET) {
1da177e4 1725 newcontext.type = tcontext->type;
eed7795d 1726 } else {
aa8e712c 1727 if ((tclass == policydb->process_class) || (sock == true)) {
eed7795d
EP		 1728 /* Use the type of process. */
1729 newcontext.type = scontext->type;
1730 } else {
1731 /* Use the type of the related object. */
1732 newcontext.type = tcontext->type;
1733 }
1da177e4
LT		 1734 }
1735
1736 /* Look for a type transition/member/change rule. */
1737 avkey.source_type = scontext->type;
1738 avkey.target_type = tcontext->type;
1739 avkey.target_class = tclass;
782ebb99 1740 avkey.specified = specified;
aa8e712c 1741 avdatum = avtab_search(&policydb->te_avtab, &avkey);
1da177e4
LT		 1742
1743 /* If no permanent rule, also check for enabled conditional rules */
5d55a345 1744 if (!avdatum) {
aa8e712c 1745 node = avtab_search_node(&policydb->te_cond_avtab, &avkey);
dbc74c65 1746 for (; node; node = avtab_search_node_next(node, specified)) {
782ebb99 1747 if (node->key.specified & AVTAB_ENABLED) {
1da177e4
LT		 1748 avdatum = &node->datum;
1749 break;
1750 }
1751 }
1752 }
1753
782ebb99 1754 if (avdatum) {
1da177e4 1755 /* Use the type from the type transition/member/change rule. */
fa1aa143 1756 newcontext.type = avdatum->u.data;
1da177e4
LT		 1757 }
1758
4742600c 1759 /* if we have a objname this is a file trans check so check those rules */
f50a3ec9 1760 if (objname)
aa8e712c 1761 filename_compute_type(policydb, &newcontext, scontext->type,
f50a3ec9 1762 tcontext->type, tclass, objname);
652bb9b0 1763
1da177e4 1764 /* Check for class-specific changes. */
63a312ca
HC		 1765 if (specified & AVTAB_TRANSITION) {
1766 /* Look for a role transition rule. */
aa8e712c
SS		 1767 for (roletr = policydb->role_tr; roletr;
1768 roletr = roletr->next) {
63a312ca
HC		 1769 if ((roletr->role == scontext->role) &&
1770 (roletr->type == tcontext->type) &&
1771 (roletr->tclass == tclass)) {
1772 /* Use the role transition rule. */
1773 newcontext.role = roletr->new_role;
1774 break;
1da177e4
LT		 1775 }
1776 }
1da177e4
LT		 1777 }
1778
1779 /* Set the MLS attributes.
1780 This is done last because it may allocate memory. */
aa8e712c 1781 rc = mls_compute_sid(policydb, scontext, tcontext, tclass, specified,
6f5317e7 1782 &newcontext, sock);
1da177e4
LT		 1783 if (rc)
1784 goto out_unlock;
1785
1786 /* Check the validity of the context. */
aa8e712c
SS		 1787 if (!policydb_context_isvalid(policydb, &newcontext)) {
1788 rc = compute_sid_handle_invalid_context(state, scontext,
1da177e4
LT		 1789 tcontext,
1790 tclass,
1791 &newcontext);
1792 if (rc)
1793 goto out_unlock;
1794 }
1795 /* Obtain the sid for the context. */
aa8e712c 1796 rc = sidtab_context_to_sid(sidtab, &newcontext, out_sid);
1da177e4 1797out_unlock:
aa8e712c 1798 read_unlock(&state->ss->policy_rwlock);
1da177e4
LT		 1799 context_destroy(&newcontext);
1800out:
1801 return rc;
1802}
1803
1804/**
1805 * security_transition_sid - Compute the SID for a new subject/object.
1806 * @ssid: source security identifier
1807 * @tsid: target security identifier
1808 * @tclass: target security class
1809 * @out_sid: security identifier for new subject/object
1810 *
1811 * Compute a SID to use for labeling a new subject or object in the
1812 * class @tclass based on a SID pair (@ssid, @tsid).
1813 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1814 * if insufficient memory is available, or %0 if the new SID was
1815 * computed successfully.
1816 */
aa8e712c
SS		 1817int security_transition_sid(struct selinux_state *state,
1818 u32 ssid, u32 tsid, u16 tclass,
652bb9b0 1819 const struct qstr *qstr, u32 *out_sid)
1da177e4 1820{
aa8e712c
SS		 1821 return security_compute_sid(state, ssid, tsid, tclass,
1822 AVTAB_TRANSITION,
f50a3ec9 1823 qstr ? qstr->name : NULL, out_sid, true);
c6d3aaa4
SS		 1824}
1825
aa8e712c
SS		 1826int security_transition_sid_user(struct selinux_state *state,
1827 u32 ssid, u32 tsid, u16 tclass,
f50a3ec9 1828 const char *objname, u32 *out_sid)
c6d3aaa4 1829{
aa8e712c
SS		 1830 return security_compute_sid(state, ssid, tsid, tclass,
1831 AVTAB_TRANSITION,
f50a3ec9 1832 objname, out_sid, false);
1da177e4
LT		 1833}
1834
1835/**
1836 * security_member_sid - Compute the SID for member selection.
1837 * @ssid: source security identifier
1838 * @tsid: target security identifier
1839 * @tclass: target security class
1840 * @out_sid: security identifier for selected member
1841 *
1842 * Compute a SID to use when selecting a member of a polyinstantiated
1843 * object of class @tclass based on a SID pair (@ssid, @tsid).
1844 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1845 * if insufficient memory is available, or %0 if the SID was
1846 * computed successfully.
1847 */
aa8e712c
SS		 1848int security_member_sid(struct selinux_state *state,
1849 u32 ssid,
1da177e4
LT		 1850 u32 tsid,
1851 u16 tclass,
1852 u32 *out_sid)
1853{
aa8e712c
SS		 1854 return security_compute_sid(state, ssid, tsid, tclass,
1855 AVTAB_MEMBER, NULL,
652bb9b0 1856 out_sid, false);
1da177e4
LT		 1857}
1858
1859/**
1860 * security_change_sid - Compute the SID for object relabeling.
1861 * @ssid: source security identifier
1862 * @tsid: target security identifier
1863 * @tclass: target security class
1864 * @out_sid: security identifier for selected member
1865 *
1866 * Compute a SID to use for relabeling an object of class @tclass
1867 * based on a SID pair (@ssid, @tsid).
1868 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1869 * if insufficient memory is available, or %0 if the SID was
1870 * computed successfully.
1871 */
aa8e712c
SS		 1872int security_change_sid(struct selinux_state *state,
1873 u32 ssid,
1da177e4
LT		 1874 u32 tsid,
1875 u16 tclass,
1876 u32 *out_sid)
1877{
aa8e712c
SS		 1878 return security_compute_sid(state,
1879 ssid, tsid, tclass, AVTAB_CHANGE, NULL,
652bb9b0 1880 out_sid, false);
b94c7e67
CS		 1881}
1882
1da177e4
LT		 1883/* Clone the SID into the new SID table. */
1884static int clone_sid(u32 sid,
1885 struct context *context,
1886 void *arg)
1887{
1888 struct sidtab *s = arg;
1889
42596eaf
GT		 1890 if (sid > SECINITSID_NUM)
1891 return sidtab_insert(s, sid, context);
1892 else
1893 return 0;
1da177e4
LT		 1894}
1895
aa8e712c
SS		 1896static inline int convert_context_handle_invalid_context(
1897 struct selinux_state *state,
1898 struct context *context)
1da177e4 1899{
aa8e712c 1900 struct policydb *policydb = &state->ss->policydb;
4b02b524
EP		 1901 char *s;
1902 u32 len;
1da177e4 1903
e5a5ca96 1904 if (enforcing_enabled(state))
4b02b524
EP		 1905 return -EINVAL;
1906
aa8e712c 1907 if (!context_struct_to_string(policydb, context, &s, &len)) {
b54c85c1 1908 pr_warn("SELinux: Context %s would be invalid if enforcing\n",
1909 s);
4b02b524 1910 kfree(s);
1da177e4 1911 }
4b02b524 1912 return 0;
1da177e4
LT		 1913}
1914
1915struct convert_context_args {
aa8e712c 1916 struct selinux_state *state;
1da177e4
LT		 1917 struct policydb *oldp;
1918 struct policydb *newp;
1919};
1920
1921/*
1922 * Convert the values in the security context
1923 * structure `c' from the values specified
1924 * in the policy `p->oldp' to the values specified
1925 * in the policy `p->newp'. Verify that the
1926 * context is valid under the new policy.
1927 */
1928static int convert_context(u32 key,
1929 struct context *c,
1930 void *p)
1931{
1932 struct convert_context_args *args;
1933 struct context oldc;
0719aaf5
GT		 1934 struct ocontext *oc;
1935 struct mls_range *range;
1da177e4
LT		 1936 struct role_datum *role;
1937 struct type_datum *typdatum;
1938 struct user_datum *usrdatum;
1939 char *s;
1940 u32 len;
42596eaf
GT		 1941 int rc = 0;
1942
1943 if (key <= SECINITSID_NUM)
1944 goto out;
1da177e4
LT		 1945
1946 args = p;
1947
12b29f34
SS		 1948 if (c->str) {
1949 struct context ctx;
4b02b524
EP		 1950
1951 rc = -ENOMEM;
9a59daa0 1952 s = kstrdup(c->str, GFP_KERNEL);
4b02b524 1953 if (!s)
9a59daa0 1954 goto out;
4b02b524 1955
9a59daa0 1956 rc = string_to_context_struct(args->newp, NULL, s,
95ffe194 1957 &ctx, SECSID_NULL);
9a59daa0 1958 kfree(s);
12b29f34 1959 if (!rc) {
b54c85c1 1960 pr_info("SELinux: Context %s became valid (mapped).\n",
12b29f34
SS		 1961 c->str);
1962 /* Replace string with mapped representation. */
1963 kfree(c->str);
1964 memcpy(c, &ctx, sizeof(*c));
1965 goto out;
1966 } else if (rc == -EINVAL) {
1967 /* Retain string representation for later mapping. */
1968 rc = 0;
1969 goto out;
1970 } else {
1971 /* Other error condition, e.g. ENOMEM. */
b54c85c1 1972 pr_err("SELinux: Unable to map context %s, rc = %d.\n",
12b29f34
SS		 1973 c->str, -rc);
1974 goto out;
1975 }
1976 }
1977
1da177e4
LT		 1978 rc = context_cpy(&oldc, c);
1979 if (rc)
1980 goto out;
1981
1da177e4 1982 /* Convert the user. */
4b02b524 1983 rc = -EINVAL;
1da177e4 1984 usrdatum = hashtab_search(args->newp->p_users.table,
ac76c05b 1985 sym_name(args->oldp, SYM_USERS, c->user - 1));
5d55a345 1986 if (!usrdatum)
1da177e4 1987 goto bad;
1da177e4
LT		 1988 c->user = usrdatum->value;
1989
1990 /* Convert the role. */
4b02b524 1991 rc = -EINVAL;
1da177e4 1992 role = hashtab_search(args->newp->p_roles.table,
ac76c05b 1993 sym_name(args->oldp, SYM_ROLES, c->role - 1));
5d55a345 1994 if (!role)
1da177e4 1995 goto bad;
1da177e4
LT		 1996 c->role = role->value;
1997
1998 /* Convert the type. */
4b02b524 1999 rc = -EINVAL;
1da177e4 2000 typdatum = hashtab_search(args->newp->p_types.table,
ac76c05b 2001 sym_name(args->oldp, SYM_TYPES, c->type - 1));
5d55a345 2002 if (!typdatum)
1da177e4 2003 goto bad;
1da177e4
LT		 2004 c->type = typdatum->value;
2005
0719aaf5
GT		 2006 /* Convert the MLS fields if dealing with MLS policies */
2007 if (args->oldp->mls_enabled && args->newp->mls_enabled) {
2008 rc = mls_convert_context(args->oldp, args->newp, c);
2009 if (rc)
2010 goto bad;
2011 } else if (args->oldp->mls_enabled && !args->newp->mls_enabled) {
2012 /*
2013 * Switching between MLS and non-MLS policy:
2014 * free any storage used by the MLS fields in the
2015 * context for all existing entries in the sidtab.
2016 */
2017 mls_context_destroy(c);
2018 } else if (!args->oldp->mls_enabled && args->newp->mls_enabled) {
2019 /*
2020 * Switching between non-MLS and MLS policy:
2021 * ensure that the MLS fields of the context for all
2022 * existing entries in the sidtab are filled in with a
2023 * suitable default value, likely taken from one of the
2024 * initial SIDs.
2025 */
2026 oc = args->newp->ocontexts[OCON_ISID];
2027 while (oc && oc->sid[0] != SECINITSID_UNLABELED)
2028 oc = oc->next;
4b02b524 2029 rc = -EINVAL;
0719aaf5 2030 if (!oc) {
b54c85c1 2031 pr_err("SELinux: unable to look up"
0719aaf5
GT		 2032 " the initial SIDs list\n");
2033 goto bad;
2034 }
2035 range = &oc->context[0].range;
2036 rc = mls_range_set(c, range);
2037 if (rc)
2038 goto bad;
2039 }
1da177e4
LT		 2040
2041 /* Check the validity of the new context. */
2042 if (!policydb_context_isvalid(args->newp, c)) {
aa8e712c
SS		 2043 rc = convert_context_handle_invalid_context(args->state,
2044 &oldc);
1da177e4
LT		 2045 if (rc)
2046 goto bad;
2047 }
2048
2049 context_destroy(&oldc);
4b02b524 2050
12b29f34 2051 rc = 0;
1da177e4
LT		 2052out:
2053 return rc;
2054bad:
12b29f34 2055 /* Map old representation to string and save it. */
aa8e712c 2056 rc = context_struct_to_string(args->oldp, &oldc, &s, &len);
4b02b524
EP		 2057 if (rc)
2058 return rc;
1da177e4 2059 context_destroy(&oldc);
12b29f34
SS		 2060 context_destroy(c);
2061 c->str = s;
2062 c->len = len;
b54c85c1 2063 pr_info("SELinux: Context %s became invalid (unmapped).\n",
12b29f34
SS		 2064 c->str);
2065 rc = 0;
1da177e4
LT		 2066 goto out;
2067}
2068
aa8e712c 2069static void security_load_policycaps(struct selinux_state *state)
3bb56b25 2070{
aa8e712c 2071 struct policydb *p = &state->ss->policydb;
4dc2fce3
SS		 2072 unsigned int i;
2073 struct ebitmap_node *node;
2074
aa8e712c
SS		 2075 for (i = 0; i < ARRAY_SIZE(state->policycap); i++)
2076 state->policycap[i] = ebitmap_get_bit(&p->policycaps, i);
4dc2fce3
SS		 2077
2078 for (i = 0; i < ARRAY_SIZE(selinux_policycap_names); i++)
2079 pr_info("SELinux: policy capability %s=%d\n",
2080 selinux_policycap_names[i],
aa8e712c 2081 ebitmap_get_bit(&p->policycaps, i));
4dc2fce3 2082
aa8e712c 2083 ebitmap_for_each_positive_bit(&p->policycaps, node, i) {
4dc2fce3
SS		 2084 if (i >= ARRAY_SIZE(selinux_policycap_names))
2085 pr_info("SELinux: unknown policy capability %u\n",
2086 i);
2087 }
3bb56b25
PM		 2088}
2089
aa8e712c
SS		 2090static int security_preserve_bools(struct selinux_state *state,
2091 struct policydb *newpolicydb);
1da177e4
LT		 2092
2093/**
2094 * security_load_policy - Load a security policy configuration.
2095 * @data: binary policy data
2096 * @len: length of data in bytes
2097 *
2098 * Load a new set of security policy configuration data,
2099 * validate it and convert the SID table as necessary.
2100 * This function will flush the access vector cache after
2101 * loading the new policy.
2102 */
aa8e712c 2103int security_load_policy(struct selinux_state *state, void *data, size_t len)
1da177e4 2104{
aa8e712c
SS		 2105 struct policydb *policydb;
2106 struct sidtab *sidtab;
b5495b42 2107 struct policydb *oldpolicydb, *newpolicydb;
1da177e4 2108 struct sidtab oldsidtab, newsidtab;
aa8e712c
SS		 2109 struct selinux_mapping *oldmapping;
2110 struct selinux_map newmap;
1da177e4
LT		 2111 struct convert_context_args args;
2112 u32 seqno;
2113 int rc = 0;
2114 struct policy_file file = { data, len }, *fp = &file;
2115
6396bb22 2116 oldpolicydb = kcalloc(2, sizeof(*oldpolicydb), GFP_KERNEL);
b5495b42
TG		 2117 if (!oldpolicydb) {
2118 rc = -ENOMEM;
2119 goto out;
2120 }
2121 newpolicydb = oldpolicydb + 1;
2122
aa8e712c
SS		 2123 policydb = &state->ss->policydb;
2124 sidtab = &state->ss->sidtab;
2125
2126 if (!state->initialized) {
2127 rc = policydb_read(policydb, fp);
2128 if (rc)
b5495b42 2129 goto out;
a2000050 2130
aa8e712c
SS		 2131 policydb->len = len;
2132 rc = selinux_set_mapping(policydb, secclass_map,
2133 &state->ss->map);
a2000050 2134 if (rc) {
aa8e712c 2135 policydb_destroy(policydb);
b5495b42 2136 goto out;
1da177e4 2137 }
a2000050 2138
aa8e712c 2139 rc = policydb_load_isids(policydb, sidtab);
a2000050 2140 if (rc) {
aa8e712c 2141 policydb_destroy(policydb);
b5495b42 2142 goto out;
b94c7e67 2143 }
a2000050 2144
aa8e712c
SS		 2145 security_load_policycaps(state);
2146 state->initialized = 1;
2147 seqno = ++state->ss->latest_granting;
1da177e4 2148 selinux_complete_init();
6b6bc620 2149 avc_ss_reset(state->avc, seqno);
4c443d1b 2150 selnl_notify_policyload(seqno);
aa8e712c 2151 selinux_status_update_policyload(state, seqno);
7420ed23 2152 selinux_netlbl_cache_invalidate();
342a0cff 2153 selinux_xfrm_notify_policyload();
b5495b42 2154 goto out;
1da177e4
LT		 2155 }
2156
2157#if 0
aa8e712c 2158 sidtab_hash_eval(sidtab, "sids");
1da177e4
LT		 2159#endif
2160
b5495b42 2161 rc = policydb_read(newpolicydb, fp);
a2000050 2162 if (rc)
b5495b42 2163 goto out;
1da177e4 2164
b5495b42 2165 newpolicydb->len = len;
0719aaf5 2166 /* If switching between different policy types, log MLS status */
aa8e712c 2167 if (policydb->mls_enabled && !newpolicydb->mls_enabled)
b54c85c1 2168 pr_info("SELinux: Disabling MLS support...\n");
aa8e712c 2169 else if (!policydb->mls_enabled && newpolicydb->mls_enabled)
b54c85c1 2170 pr_info("SELinux: Enabling MLS support...\n");
0719aaf5 2171
b5495b42 2172 rc = policydb_load_isids(newpolicydb, &newsidtab);
42596eaf 2173 if (rc) {
b54c85c1 2174 pr_err("SELinux: unable to load the initial SIDs\n");
b5495b42
TG		 2175 policydb_destroy(newpolicydb);
2176 goto out;
12b29f34 2177 }
1da177e4 2178
aa8e712c 2179 rc = selinux_set_mapping(newpolicydb, secclass_map, &newmap);
a2000050 2180 if (rc)
b94c7e67 2181 goto err;
b94c7e67 2182
aa8e712c 2183 rc = security_preserve_bools(state, newpolicydb);
e900a7d9 2184 if (rc) {
b54c85c1 2185 pr_err("SELinux: unable to preserve booleans\n");
e900a7d9
SS		 2186 goto err;
2187 }
2188
1da177e4 2189 /* Clone the SID table. */
aa8e712c 2190 sidtab_shutdown(sidtab);
a2000050 2191
aa8e712c 2192 rc = sidtab_map(sidtab, clone_sid, &newsidtab);
a2000050 2193 if (rc)
1da177e4 2194 goto err;
1da177e4 2195
12b29f34
SS		 2196 /*
2197 * Convert the internal representations of contexts
2198 * in the new SID table.
2199 */
aa8e712c
SS		 2200 args.state = state;
2201 args.oldp = policydb;
b5495b42 2202 args.newp = newpolicydb;
12b29f34 2203 rc = sidtab_map(&newsidtab, convert_context, &args);
0719aaf5 2204 if (rc) {
b54c85c1 2205 pr_err("SELinux: unable to convert the internal"
0719aaf5
GT		 2206 " representation of contexts in the new SID"
2207 " table\n");
12b29f34 2208 goto err;
0719aaf5 2209 }
1da177e4
LT		 2210
2211 /* Save the old policydb and SID table to free later. */
aa8e712c
SS		 2212 memcpy(oldpolicydb, policydb, sizeof(*policydb));
2213 sidtab_set(&oldsidtab, sidtab);
1da177e4
LT		 2214
2215 /* Install the new policydb and SID table. */
aa8e712c
SS		 2216 write_lock_irq(&state->ss->policy_rwlock);
2217 memcpy(policydb, newpolicydb, sizeof(*policydb));
2218 sidtab_set(sidtab, &newsidtab);
2219 security_load_policycaps(state);
2220 oldmapping = state->ss->map.mapping;
2221 state->ss->map.mapping = newmap.mapping;
2222 state->ss->map.size = newmap.size;
2223 seqno = ++state->ss->latest_granting;
2224 write_unlock_irq(&state->ss->policy_rwlock);
1da177e4
LT		 2225
2226 /* Free the old policydb and SID table. */
b5495b42 2227 policydb_destroy(oldpolicydb);
1da177e4 2228 sidtab_destroy(&oldsidtab);
aa8e712c 2229 kfree(oldmapping);
1da177e4 2230
6b6bc620 2231 avc_ss_reset(state->avc, seqno);
1da177e4 2232 selnl_notify_policyload(seqno);
aa8e712c 2233 selinux_status_update_policyload(state, seqno);
7420ed23 2234 selinux_netlbl_cache_invalidate();
342a0cff 2235 selinux_xfrm_notify_policyload();
1da177e4 2236
b5495b42
TG		 2237 rc = 0;
2238 goto out;
1da177e4
LT		 2239
2240err:
aa8e712c 2241 kfree(newmap.mapping);
1da177e4 2242 sidtab_destroy(&newsidtab);
b5495b42 2243 policydb_destroy(newpolicydb);
1da177e4 2244
b5495b42
TG		 2245out:
2246 kfree(oldpolicydb);
2247 return rc;
1da177e4
LT		 2248}
2249
aa8e712c 2250size_t security_policydb_len(struct selinux_state *state)
cee74f47 2251{
aa8e712c 2252 struct policydb *p = &state->ss->policydb;
cee74f47
EP		 2253 size_t len;
2254
aa8e712c
SS		 2255 read_lock(&state->ss->policy_rwlock);
2256 len = p->len;
2257 read_unlock(&state->ss->policy_rwlock);
cee74f47
EP		 2258
2259 return len;
2260}
2261
1da177e4
LT		 2262/**
2263 * security_port_sid - Obtain the SID for a port.
1da177e4
LT		 2264 * @protocol: protocol number
2265 * @port: port number
2266 * @out_sid: security identifier
2267 */
aa8e712c
SS		 2268int security_port_sid(struct selinux_state *state,
2269 u8 protocol, u16 port, u32 *out_sid)
1da177e4 2270{
aa8e712c
SS		 2271 struct policydb *policydb;
2272 struct sidtab *sidtab;
1da177e4
LT		 2273 struct ocontext *c;
2274 int rc = 0;
2275
aa8e712c
SS		 2276 read_lock(&state->ss->policy_rwlock);
2277
2278 policydb = &state->ss->policydb;
2279 sidtab = &state->ss->sidtab;
1da177e4 2280
aa8e712c 2281 c = policydb->ocontexts[OCON_PORT];
1da177e4
LT		 2282 while (c) {
2283 if (c->u.port.protocol == protocol &&
2284 c->u.port.low_port <= port &&
2285 c->u.port.high_port >= port)
2286 break;
2287 c = c->next;
2288 }
2289
2290 if (c) {
2291 if (!c->sid[0]) {
aa8e712c 2292 rc = sidtab_context_to_sid(sidtab,
1da177e4
LT		 2293 &c->context[0],
2294 &c->sid[0]);
2295 if (rc)
2296 goto out;
2297 }
2298 *out_sid = c->sid[0];
2299 } else {
2300 *out_sid = SECINITSID_PORT;
2301 }
2302
2303out:
aa8e712c 2304 read_unlock(&state->ss->policy_rwlock);
1da177e4
LT		 2305 return rc;
2306}
2307
cfc4d882
DJ		 2308/**
2309 * security_pkey_sid - Obtain the SID for a pkey.
2310 * @subnet_prefix: Subnet Prefix
2311 * @pkey_num: pkey number
2312 * @out_sid: security identifier
2313 */
aa8e712c
SS		 2314int security_ib_pkey_sid(struct selinux_state *state,
2315 u64 subnet_prefix, u16 pkey_num, u32 *out_sid)
cfc4d882 2316{
aa8e712c
SS		 2317 struct policydb *policydb;
2318 struct sidtab *sidtab;
cfc4d882
DJ		 2319 struct ocontext *c;
2320 int rc = 0;
2321
aa8e712c
SS		 2322 read_lock(&state->ss->policy_rwlock);
2323
2324 policydb = &state->ss->policydb;
2325 sidtab = &state->ss->sidtab;
cfc4d882 2326
aa8e712c 2327 c = policydb->ocontexts[OCON_IBPKEY];
cfc4d882
DJ		 2328 while (c) {
2329 if (c->u.ibpkey.low_pkey <= pkey_num &&
2330 c->u.ibpkey.high_pkey >= pkey_num &&
2331 c->u.ibpkey.subnet_prefix == subnet_prefix)
2332 break;
2333
2334 c = c->next;
2335 }
2336
2337 if (c) {
2338 if (!c->sid[0]) {
aa8e712c 2339 rc = sidtab_context_to_sid(sidtab,
cfc4d882
DJ		 2340 &c->context[0],
2341 &c->sid[0]);
2342 if (rc)
2343 goto out;
2344 }
2345 *out_sid = c->sid[0];
2346 } else
2347 *out_sid = SECINITSID_UNLABELED;
2348
2349out:
aa8e712c 2350 read_unlock(&state->ss->policy_rwlock);
cfc4d882
DJ		 2351 return rc;
2352}
2353
ab861dfc
DJ		 2354/**
2355 * security_ib_endport_sid - Obtain the SID for a subnet management interface.
2356 * @dev_name: device name
2357 * @port: port number
2358 * @out_sid: security identifier
2359 */
aa8e712c
SS		 2360int security_ib_endport_sid(struct selinux_state *state,
2361 const char *dev_name, u8 port_num, u32 *out_sid)
ab861dfc 2362{
aa8e712c
SS		 2363 struct policydb *policydb;
2364 struct sidtab *sidtab;
ab861dfc
DJ		 2365 struct ocontext *c;
2366 int rc = 0;
2367
aa8e712c 2368 read_lock(&state->ss->policy_rwlock);
ab861dfc 2369
aa8e712c
SS		 2370 policydb = &state->ss->policydb;
2371 sidtab = &state->ss->sidtab;
2372
2373 c = policydb->ocontexts[OCON_IBENDPORT];
ab861dfc
DJ		 2374 while (c) {
2375 if (c->u.ibendport.port == port_num &&
2376 !strncmp(c->u.ibendport.dev_name,
2377 dev_name,
2378 IB_DEVICE_NAME_MAX))
2379 break;
2380
2381 c = c->next;
2382 }
2383
2384 if (c) {
2385 if (!c->sid[0]) {
aa8e712c 2386 rc = sidtab_context_to_sid(sidtab,
ab861dfc
DJ		 2387 &c->context[0],
2388 &c->sid[0]);
2389 if (rc)
2390 goto out;
2391 }
2392 *out_sid = c->sid[0];
2393 } else
2394 *out_sid = SECINITSID_UNLABELED;
2395
2396out:
aa8e712c 2397 read_unlock(&state->ss->policy_rwlock);
ab861dfc
DJ		 2398 return rc;
2399}
2400
1da177e4
LT		 2401/**
2402 * security_netif_sid - Obtain the SID for a network interface.
2403 * @name: interface name
2404 * @if_sid: interface SID
1da177e4 2405 */
aa8e712c
SS		 2406int security_netif_sid(struct selinux_state *state,
2407 char *name, u32 *if_sid)
1da177e4 2408{
aa8e712c
SS		 2409 struct policydb *policydb;
2410 struct sidtab *sidtab;
1da177e4
LT		 2411 int rc = 0;
2412 struct ocontext *c;
2413
aa8e712c
SS		 2414 read_lock(&state->ss->policy_rwlock);
2415
2416 policydb = &state->ss->policydb;
2417 sidtab = &state->ss->sidtab;
1da177e4 2418
aa8e712c 2419 c = policydb->ocontexts[OCON_NETIF];
1da177e4
LT		 2420 while (c) {
2421 if (strcmp(name, c->u.name) == 0)
2422 break;
2423 c = c->next;
2424 }
2425
2426 if (c) {
2427 if (!c->sid[0] || !c->sid[1]) {
aa8e712c 2428 rc = sidtab_context_to_sid(sidtab,
1da177e4
LT		 2429 &c->context[0],
2430 &c->sid[0]);
2431 if (rc)
2432 goto out;
aa8e712c 2433 rc = sidtab_context_to_sid(sidtab,
1da177e4
LT		 2434 &c->context[1],
2435 &c->sid[1]);
2436 if (rc)
2437 goto out;
2438 }
2439 *if_sid = c->sid[0];
e8bfdb9d 2440 } else
1da177e4 2441 *if_sid = SECINITSID_NETIF;
1da177e4
LT		 2442
2443out:
aa8e712c 2444 read_unlock(&state->ss->policy_rwlock);
1da177e4
LT		 2445 return rc;
2446}
2447
2448static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask)
2449{
2450 int i, fail = 0;
2451
5d55a345
EP		 2452 for (i = 0; i < 4; i++)
2453 if (addr[i] != (input[i] & mask[i])) {
1da177e4
LT		 2454 fail = 1;
2455 break;
2456 }
2457
2458 return !fail;
2459}
2460
2461/**
2462 * security_node_sid - Obtain the SID for a node (host).
2463 * @domain: communication domain aka address family
2464 * @addrp: address
2465 * @addrlen: address length in bytes
2466 * @out_sid: security identifier
2467 */
aa8e712c
SS		 2468int security_node_sid(struct selinux_state *state,
2469 u16 domain,
1da177e4
LT		 2470 void *addrp,
2471 u32 addrlen,
2472 u32 *out_sid)
2473{
aa8e712c
SS		 2474 struct policydb *policydb;
2475 struct sidtab *sidtab;
4b02b524 2476 int rc;
1da177e4
LT		 2477 struct ocontext *c;
2478
aa8e712c
SS		 2479 read_lock(&state->ss->policy_rwlock);
2480
2481 policydb = &state->ss->policydb;
2482 sidtab = &state->ss->sidtab;
1da177e4
LT		 2483
2484 switch (domain) {
2485 case AF_INET: {
2486 u32 addr;
2487
4b02b524
EP		 2488 rc = -EINVAL;
2489 if (addrlen != sizeof(u32))
1da177e4 2490 goto out;
1da177e4
LT		 2491
2492 addr = *((u32 *)addrp);
2493
aa8e712c 2494 c = policydb->ocontexts[OCON_NODE];
1da177e4
LT		 2495 while (c) {
2496 if (c->u.node.addr == (addr & c->u.node.mask))
2497 break;
2498 c = c->next;
2499 }
2500 break;
2501 }
2502
2503 case AF_INET6:
4b02b524
EP		 2504 rc = -EINVAL;
2505 if (addrlen != sizeof(u64) * 2)
1da177e4 2506 goto out;
aa8e712c 2507 c = policydb->ocontexts[OCON_NODE6];
1da177e4
LT		 2508 while (c) {
2509 if (match_ipv6_addrmask(addrp, c->u.node6.addr,
2510 c->u.node6.mask))
2511 break;
2512 c = c->next;
2513 }
2514 break;
2515
2516 default:
4b02b524 2517 rc = 0;
1da177e4
LT		 2518 *out_sid = SECINITSID_NODE;
2519 goto out;
2520 }
2521
2522 if (c) {
2523 if (!c->sid[0]) {
aa8e712c 2524 rc = sidtab_context_to_sid(sidtab,
1da177e4
LT		 2525 &c->context[0],
2526 &c->sid[0]);
2527 if (rc)
2528 goto out;
2529 }
2530 *out_sid = c->sid[0];
2531 } else {
2532 *out_sid = SECINITSID_NODE;
2533 }
2534
4b02b524 2535 rc = 0;
1da177e4 2536out:
aa8e712c 2537 read_unlock(&state->ss->policy_rwlock);
1da177e4
LT		 2538 return rc;
2539}
2540
2541#define SIDS_NEL 25
2542
2543/**
2544 * security_get_user_sids - Obtain reachable SIDs for a user.
2545 * @fromsid: starting SID
2546 * @username: username
2547 * @sids: array of reachable SIDs for user
2548 * @nel: number of elements in @sids
2549 *
2550 * Generate the set of SIDs for legal security contexts
2551 * for a given user that can be reached by @fromsid.
2552 * Set *@sids to point to a dynamically allocated
2553 * array containing the set of SIDs. Set *@nel to the
2554 * number of elements in the array.
2555 */
2556
aa8e712c
SS		 2557int security_get_user_sids(struct selinux_state *state,
2558 u32 fromsid,
5d55a345 2559 char *username,
1da177e4
LT		 2560 u32 **sids,
2561 u32 *nel)
2562{
aa8e712c
SS		 2563 struct policydb *policydb;
2564 struct sidtab *sidtab;
1da177e4 2565 struct context *fromcon, usercon;
2c3c05db 2566 u32 *mysids = NULL, *mysids2, sid;
1da177e4
LT		 2567 u32 mynel = 0, maxnel = SIDS_NEL;
2568 struct user_datum *user;
2569 struct role_datum *role;
782ebb99 2570 struct ebitmap_node *rnode, *tnode;
1da177e4
LT		 2571 int rc = 0, i, j;
2572
2c3c05db
SS		 2573 *sids = NULL;
2574 *nel = 0;
2575
aa8e712c 2576 if (!state->initialized)
1da177e4 2577 goto out;
1da177e4 2578
aa8e712c
SS		 2579 read_lock(&state->ss->policy_rwlock);
2580
2581 policydb = &state->ss->policydb;
2582 sidtab = &state->ss->sidtab;
1da177e4 2583
12b29f34
SS		 2584 context_init(&usercon);
2585
4b02b524 2586 rc = -EINVAL;
aa8e712c 2587 fromcon = sidtab_search(sidtab, fromsid);
4b02b524 2588 if (!fromcon)
1da177e4 2589 goto out_unlock;
1da177e4 2590
4b02b524 2591 rc = -EINVAL;
aa8e712c 2592 user = hashtab_search(policydb->p_users.table, username);
4b02b524 2593 if (!user)
1da177e4 2594 goto out_unlock;
4b02b524 2595
1da177e4
LT		 2596 usercon.user = user->value;
2597
4b02b524 2598 rc = -ENOMEM;
89d155ef 2599 mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC);
4b02b524 2600 if (!mysids)
1da177e4 2601 goto out_unlock;
1da177e4 2602
9fe79ad1 2603 ebitmap_for_each_positive_bit(&user->roles, rnode, i) {
aa8e712c 2604 role = policydb->role_val_to_struct[i];
c1a7368a 2605 usercon.role = i + 1;
9fe79ad1 2606 ebitmap_for_each_positive_bit(&role->types, tnode, j) {
c1a7368a 2607 usercon.type = j + 1;
1da177e4 2608
aa8e712c
SS		 2609 if (mls_setup_user_range(policydb, fromcon, user,
2610 &usercon))
1da177e4
LT		 2611 continue;
2612
aa8e712c 2613 rc = sidtab_context_to_sid(sidtab, &usercon, &sid);
2c3c05db 2614 if (rc)
1da177e4 2615 goto out_unlock;
1da177e4
LT		 2616 if (mynel < maxnel) {
2617 mysids[mynel++] = sid;
2618 } else {
4b02b524 2619 rc = -ENOMEM;
1da177e4 2620 maxnel += SIDS_NEL;
89d155ef 2621 mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC);
4b02b524 2622 if (!mysids2)
1da177e4 2623 goto out_unlock;
1da177e4
LT		 2624 memcpy(mysids2, mysids, mynel * sizeof(*mysids2));
2625 kfree(mysids);
2626 mysids = mysids2;
2627 mysids[mynel++] = sid;
2628 }
2629 }
2630 }
4b02b524 2631 rc = 0;
1da177e4 2632out_unlock:
aa8e712c 2633 read_unlock(&state->ss->policy_rwlock);
2c3c05db
SS		 2634 if (rc || !mynel) {
2635 kfree(mysids);
2636 goto out;
2637 }
2638
4b02b524 2639 rc = -ENOMEM;
2c3c05db
SS		 2640 mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL);
2641 if (!mysids2) {
2c3c05db
SS		 2642 kfree(mysids);
2643 goto out;
2644 }
2645 for (i = 0, j = 0; i < mynel; i++) {
f01e1af4 2646 struct av_decision dummy_avd;
6b6bc620
SS		 2647 rc = avc_has_perm_noaudit(state,
2648 fromsid, mysids[i],
c6d3aaa4 2649 SECCLASS_PROCESS, /* kernel value */
2c3c05db 2650 PROCESS__TRANSITION, AVC_STRICT,
f01e1af4 2651 &dummy_avd);
2c3c05db
SS		 2652 if (!rc)
2653 mysids2[j++] = mysids[i];
2654 cond_resched();
2655 }
2656 rc = 0;
2657 kfree(mysids);
2658 *sids = mysids2;
2659 *nel = j;
1da177e4
LT		 2660out:
2661 return rc;
2662}
2663
2664/**
f31e7994 2665 * __security_genfs_sid - Helper to obtain a SID for a file in a filesystem
1da177e4
LT		 2666 * @fstype: filesystem type
2667 * @path: path from root of mount
2668 * @sclass: file security class
2669 * @sid: SID for path
2670 *
2671 * Obtain a SID to use for a file in a filesystem that
2672 * cannot support xattr or use a fixed labeling behavior like
2673 * transition SIDs or task SIDs.
f31e7994
WL		 2674 *
2675 * The caller must acquire the policy_rwlock before calling this function.
1da177e4 2676 */
aa8e712c
SS		 2677static inline int __security_genfs_sid(struct selinux_state *state,
2678 const char *fstype,
f31e7994
WL		 2679 char *path,
2680 u16 orig_sclass,
2681 u32 *sid)
1da177e4 2682{
aa8e712c
SS		 2683 struct policydb *policydb = &state->ss->policydb;
2684 struct sidtab *sidtab = &state->ss->sidtab;
1da177e4 2685 int len;
c6d3aaa4 2686 u16 sclass;
1da177e4
LT		 2687 struct genfs *genfs;
2688 struct ocontext *c;
4b02b524 2689 int rc, cmp = 0;
1da177e4 2690
b1aa5301
SS		 2691 while (path[0] == '/' && path[1] == '/')
2692 path++;
2693
aa8e712c 2694 sclass = unmap_class(&state->ss->map, orig_sclass);
4b02b524 2695 *sid = SECINITSID_UNLABELED;
c6d3aaa4 2696
aa8e712c 2697 for (genfs = policydb->genfs; genfs; genfs = genfs->next) {
1da177e4
LT		 2698 cmp = strcmp(fstype, genfs->fstype);
2699 if (cmp <= 0)
2700 break;
2701 }
2702
4b02b524
EP		 2703 rc = -ENOENT;
2704 if (!genfs || cmp)
1da177e4 2705 goto out;
1da177e4
LT		 2706
2707 for (c = genfs->head; c; c = c->next) {
2708 len = strlen(c->u.name);
2709 if ((!c->v.sclass || sclass == c->v.sclass) &&
2710 (strncmp(c->u.name, path, len) == 0))
2711 break;
2712 }
2713
4b02b524
EP		 2714 rc = -ENOENT;
2715 if (!c)
1da177e4 2716 goto out;
1da177e4
LT		 2717
2718 if (!c->sid[0]) {
aa8e712c 2719 rc = sidtab_context_to_sid(sidtab, &c->context[0], &c->sid[0]);
1da177e4
LT		 2720 if (rc)
2721 goto out;
2722 }
2723
2724 *sid = c->sid[0];
4b02b524 2725 rc = 0;
1da177e4 2726out:
1da177e4
LT		 2727 return rc;
2728}
2729
f31e7994
WL		 2730/**
2731 * security_genfs_sid - Obtain a SID for a file in a filesystem
2732 * @fstype: filesystem type
2733 * @path: path from root of mount
2734 * @sclass: file security class
2735 * @sid: SID for path
2736 *
2737 * Acquire policy_rwlock before calling __security_genfs_sid() and release
2738 * it afterward.
2739 */
aa8e712c
SS		 2740int security_genfs_sid(struct selinux_state *state,
2741 const char *fstype,
f31e7994
WL		 2742 char *path,
2743 u16 orig_sclass,
2744 u32 *sid)
2745{
2746 int retval;
2747
aa8e712c
SS		 2748 read_lock(&state->ss->policy_rwlock);
2749 retval = __security_genfs_sid(state, fstype, path, orig_sclass, sid);
2750 read_unlock(&state->ss->policy_rwlock);
f31e7994
WL		 2751 return retval;
2752}
2753
1da177e4
LT		 2754/**
2755 * security_fs_use - Determine how to handle labeling for a filesystem.
a64c54cf 2756 * @sb: superblock in question
1da177e4 2757 */
aa8e712c 2758int security_fs_use(struct selinux_state *state, struct super_block *sb)
1da177e4 2759{
aa8e712c
SS		 2760 struct policydb *policydb;
2761 struct sidtab *sidtab;
1da177e4
LT		 2762 int rc = 0;
2763 struct ocontext *c;
a64c54cf
EP		 2764 struct superblock_security_struct *sbsec = sb->s_security;
2765 const char *fstype = sb->s_type->name;
1da177e4 2766
aa8e712c
SS		 2767 read_lock(&state->ss->policy_rwlock);
2768
2769 policydb = &state->ss->policydb;
2770 sidtab = &state->ss->sidtab;
1da177e4 2771
aa8e712c 2772 c = policydb->ocontexts[OCON_FSUSE];
4d546f81
PM		 2773 while (c) {
2774 if (strcmp(fstype, c->u.name) == 0)
1da177e4 2775 break;
4d546f81 2776 c = c->next;
1da177e4
LT		 2777 }
2778
2779 if (c) {
a64c54cf 2780 sbsec->behavior = c->v.behavior;
1da177e4 2781 if (!c->sid[0]) {
aa8e712c 2782 rc = sidtab_context_to_sid(sidtab, &c->context[0],
1da177e4
LT		 2783 &c->sid[0]);
2784 if (rc)
2785 goto out;
2786 }
a64c54cf 2787 sbsec->sid = c->sid[0];
1da177e4 2788 } else {
aa8e712c 2789 rc = __security_genfs_sid(state, fstype, "/", SECCLASS_DIR,
f31e7994 2790 &sbsec->sid);
089be43e 2791 if (rc) {
a64c54cf 2792 sbsec->behavior = SECURITY_FS_USE_NONE;
089be43e
JM		 2793 rc = 0;
2794 } else {
a64c54cf 2795 sbsec->behavior = SECURITY_FS_USE_GENFS;
089be43e 2796 }
1da177e4
LT		 2797 }
2798
2799out:
aa8e712c 2800 read_unlock(&state->ss->policy_rwlock);
1da177e4
LT		 2801 return rc;
2802}
2803
aa8e712c
SS		 2804int security_get_bools(struct selinux_state *state,
2805 int *len, char ***names, int **values)
1da177e4 2806{
aa8e712c 2807 struct policydb *policydb;
4b02b524 2808 int i, rc;
1da177e4 2809
274f62e1
SS		 2810 if (!state->initialized) {
2811 *len = 0;
2812 *names = NULL;
2813 *values = NULL;
2814 return 0;
2815 }
2816
aa8e712c
SS		 2817 read_lock(&state->ss->policy_rwlock);
2818
2819 policydb = &state->ss->policydb;
2820
1da177e4
LT		 2821 *names = NULL;
2822 *values = NULL;
2823
4b02b524 2824 rc = 0;
aa8e712c 2825 *len = policydb->p_bools.nprim;
4b02b524 2826 if (!*len)
1da177e4 2827 goto out;
1da177e4 2828
4b02b524
EP		 2829 rc = -ENOMEM;
2830 *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC);
1da177e4
LT		 2831 if (!*names)
2832 goto err;
1da177e4 2833
4b02b524
EP		 2834 rc = -ENOMEM;
2835 *values = kcalloc(*len, sizeof(int), GFP_ATOMIC);
1da177e4
LT		 2836 if (!*values)
2837 goto err;
2838
2839 for (i = 0; i < *len; i++) {
aa8e712c 2840 (*values)[i] = policydb->bool_val_to_struct[i]->state;
4b02b524
EP		 2841
2842 rc = -ENOMEM;
aa8e712c
SS		 2843 (*names)[i] = kstrdup(sym_name(policydb, SYM_BOOLS, i),
2844 GFP_ATOMIC);
1da177e4
LT		 2845 if (!(*names)[i])
2846 goto err;
1da177e4
LT		 2847 }
2848 rc = 0;
2849out:
aa8e712c 2850 read_unlock(&state->ss->policy_rwlock);
1da177e4
LT		 2851 return rc;
2852err:
2853 if (*names) {
2854 for (i = 0; i < *len; i++)
9a5f04bf 2855 kfree((*names)[i]);
1da177e4 2856 }
9a5f04bf 2857 kfree(*values);
1da177e4
LT		 2858 goto out;
2859}
2860
2861
aa8e712c 2862int security_set_bools(struct selinux_state *state, int len, int *values)
1da177e4 2863{
aa8e712c 2864 struct policydb *policydb;
4b02b524 2865 int i, rc;
1da177e4
LT		 2866 int lenp, seqno = 0;
2867 struct cond_node *cur;
2868
aa8e712c
SS		 2869 write_lock_irq(&state->ss->policy_rwlock);
2870
2871 policydb = &state->ss->policydb;
1da177e4 2872
4b02b524 2873 rc = -EFAULT;
aa8e712c 2874 lenp = policydb->p_bools.nprim;
4b02b524 2875 if (len != lenp)
1da177e4 2876 goto out;
1da177e4 2877
1da177e4 2878 for (i = 0; i < len; i++) {
aa8e712c 2879 if (!!values[i] != policydb->bool_val_to_struct[i]->state) {
cdfb6b34 2880 audit_log(audit_context(), GFP_ATOMIC,
af601e46 2881 AUDIT_MAC_CONFIG_CHANGE,
4746ec5b 2882 "bool=%s val=%d old_val=%d auid=%u ses=%u",
aa8e712c 2883 sym_name(policydb, SYM_BOOLS, i),
af601e46 2884 !!values[i],
aa8e712c 2885 policydb->bool_val_to_struct[i]->state,
581abc09 2886 from_kuid(&init_user_ns, audit_get_loginuid(current)),
4746ec5b 2887 audit_get_sessionid(current));
af601e46 2888 }
5d55a345 2889 if (values[i])
aa8e712c 2890 policydb->bool_val_to_struct[i]->state = 1;
5d55a345 2891 else
aa8e712c 2892 policydb->bool_val_to_struct[i]->state = 0;
1da177e4 2893 }
1da177e4 2894
aa8e712c
SS		 2895 for (cur = policydb->cond_list; cur; cur = cur->next) {
2896 rc = evaluate_cond_node(policydb, cur);
1da177e4
LT		 2897 if (rc)
2898 goto out;
2899 }
2900
aa8e712c 2901 seqno = ++state->ss->latest_granting;
4b02b524 2902 rc = 0;
1da177e4 2903out:
aa8e712c 2904 write_unlock_irq(&state->ss->policy_rwlock);
1da177e4 2905 if (!rc) {
6b6bc620 2906 avc_ss_reset(state->avc, seqno);
1da177e4 2907 selnl_notify_policyload(seqno);
aa8e712c 2908 selinux_status_update_policyload(state, seqno);
342a0cff 2909 selinux_xfrm_notify_policyload();
1da177e4
LT		 2910 }
2911 return rc;
2912}
2913
aa8e712c
SS		 2914int security_get_bool_value(struct selinux_state *state,
2915 int index)
1da177e4 2916{
aa8e712c 2917 struct policydb *policydb;
4b02b524 2918 int rc;
1da177e4
LT		 2919 int len;
2920
aa8e712c
SS		 2921 read_lock(&state->ss->policy_rwlock);
2922
2923 policydb = &state->ss->policydb;
1da177e4 2924
4b02b524 2925 rc = -EFAULT;
aa8e712c 2926 len = policydb->p_bools.nprim;
0fd71a62 2927 if (index >= len)
1da177e4 2928 goto out;
1da177e4 2929
aa8e712c 2930 rc = policydb->bool_val_to_struct[index]->state;
1da177e4 2931out:
aa8e712c 2932 read_unlock(&state->ss->policy_rwlock);
1da177e4
LT		 2933 return rc;
2934}
376bd9cb 2935
aa8e712c
SS		 2936static int security_preserve_bools(struct selinux_state *state,
2937 struct policydb *policydb)
e900a7d9
SS		 2938{
2939 int rc, nbools = 0, *bvalues = NULL, i;
2940 char **bnames = NULL;
2941 struct cond_bool_datum *booldatum;
2942 struct cond_node *cur;
2943
aa8e712c 2944 rc = security_get_bools(state, &nbools, &bnames, &bvalues);
e900a7d9
SS		 2945 if (rc)
2946 goto out;
2947 for (i = 0; i < nbools; i++) {
aa8e712c 2948 booldatum = hashtab_search(policydb->p_bools.table, bnames[i]);
e900a7d9
SS		 2949 if (booldatum)
2950 booldatum->state = bvalues[i];
2951 }
aa8e712c
SS		 2952 for (cur = policydb->cond_list; cur; cur = cur->next) {
2953 rc = evaluate_cond_node(policydb, cur);
e900a7d9
SS		 2954 if (rc)
2955 goto out;
2956 }
2957
2958out:
2959 if (bnames) {
2960 for (i = 0; i < nbools; i++)
2961 kfree(bnames[i]);
2962 }
2963 kfree(bnames);
2964 kfree(bvalues);
2965 return rc;
2966}
2967
08554d6b
VY		 2968/*
2969 * security_sid_mls_copy() - computes a new sid based on the given
2970 * sid and the mls portion of mls_sid.
2971 */
aa8e712c
SS		 2972int security_sid_mls_copy(struct selinux_state *state,
2973 u32 sid, u32 mls_sid, u32 *new_sid)
08554d6b 2974{
aa8e712c
SS		 2975 struct policydb *policydb = &state->ss->policydb;
2976 struct sidtab *sidtab = &state->ss->sidtab;
08554d6b
VY		 2977 struct context *context1;
2978 struct context *context2;
2979 struct context newcon;
2980 char *s;
2981 u32 len;
4b02b524 2982 int rc;
08554d6b 2983
4b02b524 2984 rc = 0;
aa8e712c 2985 if (!state->initialized || !policydb->mls_enabled) {
08554d6b
VY		 2986 *new_sid = sid;
2987 goto out;
2988 }
2989
2990 context_init(&newcon);
2991
aa8e712c 2992 read_lock(&state->ss->policy_rwlock);
4b02b524
EP		 2993
2994 rc = -EINVAL;
aa8e712c 2995 context1 = sidtab_search(sidtab, sid);
08554d6b 2996 if (!context1) {
b54c85c1 2997 pr_err("SELinux: %s: unrecognized SID %d\n",
744ba35e 2998 __func__, sid);
08554d6b
VY		 2999 goto out_unlock;
3000 }
3001
4b02b524 3002 rc = -EINVAL;
aa8e712c 3003 context2 = sidtab_search(sidtab, mls_sid);
08554d6b 3004 if (!context2) {
b54c85c1 3005 pr_err("SELinux: %s: unrecognized SID %d\n",
744ba35e 3006 __func__, mls_sid);
08554d6b
VY		 3007 goto out_unlock;
3008 }
3009
3010 newcon.user = context1->user;
3011 newcon.role = context1->role;
3012 newcon.type = context1->type;
0efc61ea 3013 rc = mls_context_cpy(&newcon, context2);
08554d6b
VY		 3014 if (rc)
3015 goto out_unlock;
3016
08554d6b 3017 /* Check the validity of the new context. */
aa8e712c
SS		 3018 if (!policydb_context_isvalid(policydb, &newcon)) {
3019 rc = convert_context_handle_invalid_context(state, &newcon);
4b02b524 3020 if (rc) {
aa8e712c
SS		 3021 if (!context_struct_to_string(policydb, &newcon, &s,
3022 &len)) {
cdfb6b34 3023 audit_log(audit_context(),
4093a844
RGB		 3024 GFP_ATOMIC, AUDIT_SELINUX_ERR,
3025 "op=security_sid_mls_copy "
3026 "invalid_context=%s", s);
4b02b524
EP		 3027 kfree(s);
3028 }
3029 goto out_unlock;
3030 }
08554d6b
VY		 3031 }
3032
aa8e712c 3033 rc = sidtab_context_to_sid(sidtab, &newcon, new_sid);
08554d6b 3034out_unlock:
aa8e712c 3035 read_unlock(&state->ss->policy_rwlock);
08554d6b
VY		 3036 context_destroy(&newcon);
3037out:
3038 return rc;
3039}
3040
220deb96
PM		 3041/**
3042 * security_net_peersid_resolve - Compare and resolve two network peer SIDs
3043 * @nlbl_sid: NetLabel SID
3044 * @nlbl_type: NetLabel labeling protocol type
3045 * @xfrm_sid: XFRM SID
3046 *
3047 * Description:
3048 * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be
3049 * resolved into a single SID it is returned via @peer_sid and the function
3050 * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function
3051 * returns a negative value. A table summarizing the behavior is below:
3052 *
3053 * | function return | @sid
3054 * ------------------------------+-----------------+-----------------
3055 * no peer labels | 0 | SECSID_NULL
3056 * single peer label | 0 | <peer_label>
3057 * multiple, consistent labels | 0 | <peer_label>
3058 * multiple, inconsistent labels | -<errno> | SECSID_NULL
3059 *
3060 */
aa8e712c
SS		 3061int security_net_peersid_resolve(struct selinux_state *state,
3062 u32 nlbl_sid, u32 nlbl_type,
220deb96
PM		 3063 u32 xfrm_sid,
3064 u32 *peer_sid)
3065{
aa8e712c
SS		 3066 struct policydb *policydb = &state->ss->policydb;
3067 struct sidtab *sidtab = &state->ss->sidtab;
220deb96
PM		 3068 int rc;
3069 struct context *nlbl_ctx;
3070 struct context *xfrm_ctx;
3071
4b02b524
EP		 3072 *peer_sid = SECSID_NULL;
3073
220deb96
PM		 3074 /* handle the common (which also happens to be the set of easy) cases
3075 * right away, these two if statements catch everything involving a
3076 * single or absent peer SID/label */
3077 if (xfrm_sid == SECSID_NULL) {
3078 *peer_sid = nlbl_sid;
3079 return 0;
3080 }
3081 /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label
3082 * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label
3083 * is present */
3084 if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) {
3085 *peer_sid = xfrm_sid;
3086 return 0;
3087 }
3088
aa8e712c
SS		 3089 /*
3090 * We don't need to check initialized here since the only way both
220deb96 3091 * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the
aa8e712c
SS		 3092 * security server was initialized and state->initialized was true.
3093 */
3094 if (!policydb->mls_enabled)
220deb96 3095 return 0;
220deb96 3096
aa8e712c 3097 read_lock(&state->ss->policy_rwlock);
220deb96 3098
4b02b524 3099 rc = -EINVAL;
aa8e712c 3100 nlbl_ctx = sidtab_search(sidtab, nlbl_sid);
220deb96 3101 if (!nlbl_ctx) {
b54c85c1 3102 pr_err("SELinux: %s: unrecognized SID %d\n",
744ba35e 3103 __func__, nlbl_sid);
4b02b524 3104 goto out;
220deb96 3105 }
4b02b524 3106 rc = -EINVAL;
aa8e712c 3107 xfrm_ctx = sidtab_search(sidtab, xfrm_sid);
220deb96 3108 if (!xfrm_ctx) {
b54c85c1 3109 pr_err("SELinux: %s: unrecognized SID %d\n",
744ba35e 3110 __func__, xfrm_sid);
4b02b524 3111 goto out;
220deb96
PM		 3112 }
3113 rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES);
4b02b524
EP		 3114 if (rc)
3115 goto out;
220deb96 3116
4b02b524
EP		 3117 /* at present NetLabel SIDs/labels really only carry MLS
3118 * information so if the MLS portion of the NetLabel SID
3119 * matches the MLS portion of the labeled XFRM SID/label
3120 * then pass along the XFRM SID as it is the most
3121 * expressive */
3122 *peer_sid = xfrm_sid;
3123out:
aa8e712c 3124 read_unlock(&state->ss->policy_rwlock);
220deb96
PM		 3125 return rc;
3126}
3127
55fcf09b
CP		 3128static int get_classes_callback(void *k, void *d, void *args)
3129{
3130 struct class_datum *datum = d;
3131 char *name = k, **classes = args;
3132 int value = datum->value - 1;
3133
3134 classes[value] = kstrdup(name, GFP_ATOMIC);
3135 if (!classes[value])
3136 return -ENOMEM;
3137
3138 return 0;
3139}
3140
aa8e712c
SS		 3141int security_get_classes(struct selinux_state *state,
3142 char ***classes, int *nclasses)
55fcf09b 3143{
aa8e712c 3144 struct policydb *policydb = &state->ss->policydb;
4b02b524 3145 int rc;
55fcf09b 3146
274f62e1
SS		 3147 if (!state->initialized) {
3148 *nclasses = 0;
3149 *classes = NULL;
3150 return 0;
3151 }
3152
aa8e712c 3153 read_lock(&state->ss->policy_rwlock);
55fcf09b 3154
4b02b524 3155 rc = -ENOMEM;
aa8e712c 3156 *nclasses = policydb->p_classes.nprim;
9f59f90b 3157 *classes = kcalloc(*nclasses, sizeof(**classes), GFP_ATOMIC);
55fcf09b
CP		 3158 if (!*classes)
3159 goto out;
3160
aa8e712c 3161 rc = hashtab_map(policydb->p_classes.table, get_classes_callback,
55fcf09b 3162 *classes);
4b02b524 3163 if (rc) {
55fcf09b
CP		 3164 int i;
3165 for (i = 0; i < *nclasses; i++)
3166 kfree((*classes)[i]);
3167 kfree(*classes);
3168 }
3169
3170out:
aa8e712c 3171 read_unlock(&state->ss->policy_rwlock);
55fcf09b
CP		 3172 return rc;
3173}
3174
3175static int get_permissions_callback(void *k, void *d, void *args)
3176{
3177 struct perm_datum *datum = d;
3178 char *name = k, **perms = args;
3179 int value = datum->value - 1;
3180
3181 perms[value] = kstrdup(name, GFP_ATOMIC);
3182 if (!perms[value])
3183 return -ENOMEM;
3184
3185 return 0;
3186}
3187
aa8e712c
SS		 3188int security_get_permissions(struct selinux_state *state,
3189 char *class, char ***perms, int *nperms)
55fcf09b 3190{
aa8e712c 3191 struct policydb *policydb = &state->ss->policydb;
4b02b524 3192 int rc, i;
55fcf09b
CP		 3193 struct class_datum *match;
3194
aa8e712c 3195 read_lock(&state->ss->policy_rwlock);
55fcf09b 3196
4b02b524 3197 rc = -EINVAL;
aa8e712c 3198 match = hashtab_search(policydb->p_classes.table, class);
55fcf09b 3199 if (!match) {
b54c85c1 3200 pr_err("SELinux: %s: unrecognized class %s\n",
dd6f953a 3201 __func__, class);
55fcf09b
CP		 3202 goto out;
3203 }
3204
4b02b524 3205 rc = -ENOMEM;
55fcf09b 3206 *nperms = match->permissions.nprim;
9f59f90b 3207 *perms = kcalloc(*nperms, sizeof(**perms), GFP_ATOMIC);
55fcf09b
CP		 3208 if (!*perms)
3209 goto out;
3210
3211 if (match->comdatum) {
3212 rc = hashtab_map(match->comdatum->permissions.table,
3213 get_permissions_callback, *perms);
4b02b524 3214 if (rc)
55fcf09b
CP		 3215 goto err;
3216 }
3217
3218 rc = hashtab_map(match->permissions.table, get_permissions_callback,
3219 *perms);
4b02b524 3220 if (rc)
55fcf09b
CP		 3221 goto err;
3222
3223out:
aa8e712c 3224 read_unlock(&state->ss->policy_rwlock);
55fcf09b
CP		 3225 return rc;
3226
3227err:
aa8e712c 3228 read_unlock(&state->ss->policy_rwlock);
55fcf09b
CP		 3229 for (i = 0; i < *nperms; i++)
3230 kfree((*perms)[i]);
3231 kfree(*perms);
3232 return rc;
3233}
3234
aa8e712c 3235int security_get_reject_unknown(struct selinux_state *state)
3f12070e 3236{
aa8e712c 3237 return state->ss->policydb.reject_unknown;
3f12070e
EP		 3238}
3239
aa8e712c 3240int security_get_allow_unknown(struct selinux_state *state)
3f12070e 3241{
aa8e712c 3242 return state->ss->policydb.allow_unknown;
3f12070e
EP		 3243}
3244
3bb56b25
PM		 3245/**
3246 * security_policycap_supported - Check for a specific policy capability
3247 * @req_cap: capability
3248 *
3249 * Description:
3250 * This function queries the currently loaded policy to see if it supports the
3251 * capability specified by @req_cap. Returns true (1) if the capability is
3252 * supported, false (0) if it isn't supported.
3253 *
3254 */
aa8e712c
SS		 3255int security_policycap_supported(struct selinux_state *state,
3256 unsigned int req_cap)
3bb56b25 3257{
aa8e712c 3258 struct policydb *policydb = &state->ss->policydb;
3bb56b25
PM		 3259 int rc;
3260
aa8e712c
SS		 3261 read_lock(&state->ss->policy_rwlock);
3262 rc = ebitmap_get_bit(&policydb->policycaps, req_cap);
3263 read_unlock(&state->ss->policy_rwlock);
3bb56b25
PM		 3264
3265 return rc;
3266}
3267
376bd9cb
DG		 3268struct selinux_audit_rule {
3269 u32 au_seqno;
3270 struct context au_ctxt;
3271};
3272
9d57a7f9 3273void selinux_audit_rule_free(void *vrule)
376bd9cb 3274{
9d57a7f9
AD		 3275 struct selinux_audit_rule *rule = vrule;
3276
376bd9cb
DG		 3277 if (rule) {
3278 context_destroy(&rule->au_ctxt);
3279 kfree(rule);
3280 }
3281}
3282
9d57a7f9 3283int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
376bd9cb 3284{
aa8e712c
SS		 3285 struct selinux_state *state = &selinux_state;
3286 struct policydb *policydb = &state->ss->policydb;
376bd9cb
DG		 3287 struct selinux_audit_rule *tmprule;
3288 struct role_datum *roledatum;
3289 struct type_datum *typedatum;
3290 struct user_datum *userdatum;
9d57a7f9 3291 struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule;
376bd9cb
DG		 3292 int rc = 0;
3293
3294 *rule = NULL;
3295
aa8e712c 3296 if (!state->initialized)
3ad40d64 3297 return -EOPNOTSUPP;
376bd9cb
DG		 3298
3299 switch (field) {
3a6b9f85
DG		 3300 case AUDIT_SUBJ_USER:
3301 case AUDIT_SUBJ_ROLE:
3302 case AUDIT_SUBJ_TYPE:
6e5a2d1d
DG		 3303 case AUDIT_OBJ_USER:
3304 case AUDIT_OBJ_ROLE:
3305 case AUDIT_OBJ_TYPE:
376bd9cb 3306 /* only 'equals' and 'not equals' fit user, role, and type */
5af75d8d 3307 if (op != Audit_equal && op != Audit_not_equal)
376bd9cb
DG		 3308 return -EINVAL;
3309 break;
3a6b9f85
DG		 3310 case AUDIT_SUBJ_SEN:
3311 case AUDIT_SUBJ_CLR:
6e5a2d1d
DG		 3312 case AUDIT_OBJ_LEV_LOW:
3313 case AUDIT_OBJ_LEV_HIGH:
25985edc 3314 /* we do not allow a range, indicated by the presence of '-' */
376bd9cb
DG		 3315 if (strchr(rulestr, '-'))
3316 return -EINVAL;
3317 break;
3318 default:
3319 /* only the above fields are valid */
3320 return -EINVAL;
3321 }
3322
3323 tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL);
3324 if (!tmprule)
3325 return -ENOMEM;
3326
3327 context_init(&tmprule->au_ctxt);
3328
aa8e712c 3329 read_lock(&state->ss->policy_rwlock);
376bd9cb 3330
aa8e712c 3331 tmprule->au_seqno = state->ss->latest_granting;
376bd9cb
DG		 3332
3333 switch (field) {
3a6b9f85 3334 case AUDIT_SUBJ_USER:
6e5a2d1d 3335 case AUDIT_OBJ_USER:
4b02b524 3336 rc = -EINVAL;
aa8e712c 3337 userdatum = hashtab_search(policydb->p_users.table, rulestr);
376bd9cb 3338 if (!userdatum)
4b02b524
EP		 3339 goto out;
3340 tmprule->au_ctxt.user = userdatum->value;
376bd9cb 3341 break;
3a6b9f85 3342 case AUDIT_SUBJ_ROLE:
6e5a2d1d 3343 case AUDIT_OBJ_ROLE:
4b02b524 3344 rc = -EINVAL;
aa8e712c 3345 roledatum = hashtab_search(policydb->p_roles.table, rulestr);
376bd9cb 3346 if (!roledatum)
4b02b524
EP		 3347 goto out;
3348 tmprule->au_ctxt.role = roledatum->value;
376bd9cb 3349 break;
3a6b9f85 3350 case AUDIT_SUBJ_TYPE:
6e5a2d1d 3351 case AUDIT_OBJ_TYPE:
4b02b524 3352 rc = -EINVAL;
aa8e712c 3353 typedatum = hashtab_search(policydb->p_types.table, rulestr);
376bd9cb 3354 if (!typedatum)
4b02b524
EP		 3355 goto out;
3356 tmprule->au_ctxt.type = typedatum->value;
376bd9cb 3357 break;
3a6b9f85
DG		 3358 case AUDIT_SUBJ_SEN:
3359 case AUDIT_SUBJ_CLR:
6e5a2d1d
DG		 3360 case AUDIT_OBJ_LEV_LOW:
3361 case AUDIT_OBJ_LEV_HIGH:
aa8e712c
SS		 3362 rc = mls_from_string(policydb, rulestr, &tmprule->au_ctxt,
3363 GFP_ATOMIC);
4b02b524
EP		 3364 if (rc)
3365 goto out;
376bd9cb
DG		 3366 break;
3367 }
4b02b524
EP		 3368 rc = 0;
3369out:
aa8e712c 3370 read_unlock(&state->ss->policy_rwlock);
376bd9cb
DG		 3371
3372 if (rc) {
3373 selinux_audit_rule_free(tmprule);
3374 tmprule = NULL;
3375 }
3376
3377 *rule = tmprule;
3378
3379 return rc;
3380}
3381
9d57a7f9
AD		 3382/* Check to see if the rule contains any selinux fields */
3383int selinux_audit_rule_known(struct audit_krule *rule)
3384{
3385 int i;
3386
3387 for (i = 0; i < rule->field_count; i++) {
3388 struct audit_field *f = &rule->fields[i];
3389 switch (f->type) {
3390 case AUDIT_SUBJ_USER:
3391 case AUDIT_SUBJ_ROLE:
3392 case AUDIT_SUBJ_TYPE:
3393 case AUDIT_SUBJ_SEN:
3394 case AUDIT_SUBJ_CLR:
3395 case AUDIT_OBJ_USER:
3396 case AUDIT_OBJ_ROLE:
3397 case AUDIT_OBJ_TYPE:
3398 case AUDIT_OBJ_LEV_LOW:
3399 case AUDIT_OBJ_LEV_HIGH:
3400 return 1;
3401 }
3402 }
3403
3404 return 0;
3405}
3406
3407int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule,
f5269710 3408 struct audit_context *actx)
376bd9cb 3409{
aa8e712c 3410 struct selinux_state *state = &selinux_state;
376bd9cb
DG		 3411 struct context *ctxt;
3412 struct mls_level *level;
9d57a7f9 3413 struct selinux_audit_rule *rule = vrule;
376bd9cb
DG		 3414 int match = 0;
3415
9ad42a79
RGB		 3416 if (unlikely(!rule)) {
3417 WARN_ONCE(1, "selinux_audit_rule_match: missing rule\n");
376bd9cb
DG		 3418 return -ENOENT;
3419 }
3420
aa8e712c 3421 read_lock(&state->ss->policy_rwlock);
376bd9cb 3422
aa8e712c 3423 if (rule->au_seqno < state->ss->latest_granting) {
376bd9cb
DG		 3424 match = -ESTALE;
3425 goto out;
3426 }
3427
aa8e712c 3428 ctxt = sidtab_search(&state->ss->sidtab, sid);
9ad42a79
RGB		 3429 if (unlikely(!ctxt)) {
3430 WARN_ONCE(1, "selinux_audit_rule_match: unrecognized SID %d\n",
5d55a345 3431 sid);
376bd9cb
DG		 3432 match = -ENOENT;
3433 goto out;
3434 }
3435
3436 /* a field/op pair that is not caught here will simply fall through
3437 without a match */
3438 switch (field) {
3a6b9f85 3439 case AUDIT_SUBJ_USER:
6e5a2d1d 3440 case AUDIT_OBJ_USER:
376bd9cb 3441 switch (op) {
5af75d8d 3442 case Audit_equal:
376bd9cb
DG		 3443 match = (ctxt->user == rule->au_ctxt.user);
3444 break;
5af75d8d 3445 case Audit_not_equal:
376bd9cb
DG		 3446 match = (ctxt->user != rule->au_ctxt.user);
3447 break;
3448 }
3449 break;
3a6b9f85 3450 case AUDIT_SUBJ_ROLE:
6e5a2d1d 3451 case AUDIT_OBJ_ROLE:
376bd9cb 3452 switch (op) {
5af75d8d 3453 case Audit_equal:
376bd9cb
DG		 3454 match = (ctxt->role == rule->au_ctxt.role);
3455 break;
5af75d8d 3456 case Audit_not_equal:
376bd9cb
DG		 3457 match = (ctxt->role != rule->au_ctxt.role);
3458 break;
3459 }
3460 break;
3a6b9f85 3461 case AUDIT_SUBJ_TYPE:
6e5a2d1d 3462 case AUDIT_OBJ_TYPE:
376bd9cb 3463 switch (op) {
5af75d8d 3464 case Audit_equal:
376bd9cb
DG		 3465 match = (ctxt->type == rule->au_ctxt.type);
3466 break;
5af75d8d 3467 case Audit_not_equal:
376bd9cb
DG		 3468 match = (ctxt->type != rule->au_ctxt.type);
3469 break;
3470 }
3471 break;
3a6b9f85
DG		 3472 case AUDIT_SUBJ_SEN:
3473 case AUDIT_SUBJ_CLR:
6e5a2d1d
DG		 3474 case AUDIT_OBJ_LEV_LOW:
3475 case AUDIT_OBJ_LEV_HIGH:
3476 level = ((field == AUDIT_SUBJ_SEN ||
5d55a345
EP		 3477 field == AUDIT_OBJ_LEV_LOW) ?
3478 &ctxt->range.level[0] : &ctxt->range.level[1]);
376bd9cb 3479 switch (op) {
5af75d8d 3480 case Audit_equal:
376bd9cb 3481 match = mls_level_eq(&rule->au_ctxt.range.level[0],
5d55a345 3482 level);
376bd9cb 3483 break;
5af75d8d 3484 case Audit_not_equal:
376bd9cb 3485 match = !mls_level_eq(&rule->au_ctxt.range.level[0],
5d55a345 3486 level);
376bd9cb 3487 break;
5af75d8d 3488 case Audit_lt:
376bd9cb 3489 match = (mls_level_dom(&rule->au_ctxt.range.level[0],
5d55a345
EP		 3490 level) &&
3491 !mls_level_eq(&rule->au_ctxt.range.level[0],
3492 level));
376bd9cb 3493 break;
5af75d8d 3494 case Audit_le:
376bd9cb 3495 match = mls_level_dom(&rule->au_ctxt.range.level[0],
5d55a345 3496 level);
376bd9cb 3497 break;
5af75d8d 3498 case Audit_gt:
376bd9cb 3499 match = (mls_level_dom(level,
5d55a345
EP		 3500 &rule->au_ctxt.range.level[0]) &&
3501 !mls_level_eq(level,
3502 &rule->au_ctxt.range.level[0]));
376bd9cb 3503 break;
5af75d8d 3504 case Audit_ge:
376bd9cb 3505 match = mls_level_dom(level,
5d55a345 3506 &rule->au_ctxt.range.level[0]);
376bd9cb
DG		 3507 break;
3508 }
3509 }
3510
3511out:
aa8e712c 3512 read_unlock(&state->ss->policy_rwlock);
376bd9cb
DG		 3513 return match;
3514}
3515
9d57a7f9 3516static int (*aurule_callback)(void) = audit_update_lsm_rules;
376bd9cb 3517
562c99f2 3518static int aurule_avc_callback(u32 event)
376bd9cb
DG		 3519{
3520 int err = 0;
3521
3522 if (event == AVC_CALLBACK_RESET && aurule_callback)
3523 err = aurule_callback();
3524 return err;
3525}
3526
3527static int __init aurule_init(void)
3528{
3529 int err;
3530
562c99f2 3531 err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET);
376bd9cb
DG		 3532 if (err)
3533 panic("avc_add_callback() failed, error %d\n", err);
3534
3535 return err;
3536}
3537__initcall(aurule_init);
3538
7420ed23 3539#ifdef CONFIG_NETLABEL
7420ed23 3540/**
5778eabd
PM		 3541 * security_netlbl_cache_add - Add an entry to the NetLabel cache
3542 * @secattr: the NetLabel packet security attributes
5dbe1eb0 3543 * @sid: the SELinux SID
7420ed23
VY		 3544 *
3545 * Description:
3546 * Attempt to cache the context in @ctx, which was derived from the packet in
5778eabd
PM		 3547 * @skb, in the NetLabel subsystem cache. This function assumes @secattr has
3548 * already been initialized.
7420ed23
VY		 3549 *
3550 */
5778eabd 3551static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr,
5dbe1eb0 3552 u32 sid)
7420ed23 3553{
5dbe1eb0 3554 u32 *sid_cache;
7420ed23 3555
5dbe1eb0
PM		 3556 sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC);
3557 if (sid_cache == NULL)
5778eabd 3558 return;
5dbe1eb0
PM		 3559 secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC);
3560 if (secattr->cache == NULL) {
3561 kfree(sid_cache);
5778eabd 3562 return;
0ec8abd7 3563 }
7420ed23 3564
5dbe1eb0
PM		 3565 *sid_cache = sid;
3566 secattr->cache->free = kfree;
3567 secattr->cache->data = sid_cache;
5778eabd 3568 secattr->flags |= NETLBL_SECATTR_CACHE;
7420ed23
VY		 3569}
3570
3571/**
5778eabd 3572 * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID
7420ed23 3573 * @secattr: the NetLabel packet security attributes
7420ed23
VY		 3574 * @sid: the SELinux SID
3575 *
3576 * Description:
5778eabd 3577 * Convert the given NetLabel security attributes in @secattr into a
7420ed23 3578 * SELinux SID. If the @secattr field does not contain a full SELinux
25985edc 3579 * SID/context then use SECINITSID_NETMSG as the foundation. If possible the
5dbe1eb0
PM		 3580 * 'cache' field of @secattr is set and the CACHE flag is set; this is to
3581 * allow the @secattr to be used by NetLabel to cache the secattr to SID
3582 * conversion for future lookups. Returns zero on success, negative values on
3583 * failure.
7420ed23
VY		 3584 *
3585 */
aa8e712c
SS		 3586int security_netlbl_secattr_to_sid(struct selinux_state *state,
3587 struct netlbl_lsm_secattr *secattr,
5778eabd 3588 u32 *sid)
7420ed23 3589{
aa8e712c
SS		 3590 struct policydb *policydb = &state->ss->policydb;
3591 struct sidtab *sidtab = &state->ss->sidtab;
7ae9f23c 3592 int rc;
7420ed23
VY		 3593 struct context *ctx;
3594 struct context ctx_new;
5778eabd 3595
aa8e712c 3596 if (!state->initialized) {
5778eabd
PM		 3597 *sid = SECSID_NULL;
3598 return 0;
3599 }
7420ed23 3600
aa8e712c 3601 read_lock(&state->ss->policy_rwlock);
7420ed23 3602
7ae9f23c 3603 if (secattr->flags & NETLBL_SECATTR_CACHE)
5dbe1eb0 3604 *sid = *(u32 *)secattr->cache->data;
7ae9f23c 3605 else if (secattr->flags & NETLBL_SECATTR_SECID)
16efd454 3606 *sid = secattr->attr.secid;
7ae9f23c
EP		 3607 else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) {
3608 rc = -EIDRM;
aa8e712c 3609 ctx = sidtab_search(sidtab, SECINITSID_NETMSG);
7420ed23 3610 if (ctx == NULL)
7ae9f23c 3611 goto out;
7420ed23 3612
81990fbd 3613 context_init(&ctx_new);
7420ed23
VY		 3614 ctx_new.user = ctx->user;
3615 ctx_new.role = ctx->role;
3616 ctx_new.type = ctx->type;
aa8e712c 3617 mls_import_netlbl_lvl(policydb, &ctx_new, secattr);
701a90ba 3618 if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
aa8e712c 3619 rc = mls_import_netlbl_cat(policydb, &ctx_new, secattr);
7ae9f23c
EP		 3620 if (rc)
3621 goto out;
7420ed23 3622 }
7ae9f23c 3623 rc = -EIDRM;
aa8e712c 3624 if (!mls_context_isvalid(policydb, &ctx_new))
7ae9f23c 3625 goto out_free;
7420ed23 3626
aa8e712c 3627 rc = sidtab_context_to_sid(sidtab, &ctx_new, sid);
7ae9f23c
EP		 3628 if (rc)
3629 goto out_free;
7420ed23 3630
5dbe1eb0 3631 security_netlbl_cache_add(secattr, *sid);
5778eabd 3632
7420ed23 3633 ebitmap_destroy(&ctx_new.range.level[0].cat);
7ae9f23c 3634 } else
388b2405 3635 *sid = SECSID_NULL;
7420ed23 3636
aa8e712c 3637 read_unlock(&state->ss->policy_rwlock);
7ae9f23c
EP		 3638 return 0;
3639out_free:
7420ed23 3640 ebitmap_destroy(&ctx_new.range.level[0].cat);
7ae9f23c 3641out:
aa8e712c 3642 read_unlock(&state->ss->policy_rwlock);
7ae9f23c 3643 return rc;
7420ed23
VY		 3644}
3645
3646/**
5778eabd
PM		 3647 * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr
3648 * @sid: the SELinux SID
3649 * @secattr: the NetLabel packet security attributes
7420ed23
VY		 3650 *
3651 * Description:
5778eabd
PM		 3652 * Convert the given SELinux SID in @sid into a NetLabel security attribute.
3653 * Returns zero on success, negative values on failure.
7420ed23
VY		 3654 *
3655 */
aa8e712c
SS		 3656int security_netlbl_sid_to_secattr(struct selinux_state *state,
3657 u32 sid, struct netlbl_lsm_secattr *secattr)
7420ed23 3658{
aa8e712c 3659 struct policydb *policydb = &state->ss->policydb;
99d854d2 3660 int rc;
7420ed23
VY		 3661 struct context *ctx;
3662
aa8e712c 3663 if (!state->initialized)
7420ed23
VY		 3664 return 0;
3665
aa8e712c 3666 read_lock(&state->ss->policy_rwlock);
4b02b524
EP		 3667
3668 rc = -ENOENT;
aa8e712c 3669 ctx = sidtab_search(&state->ss->sidtab, sid);
4b02b524
EP		 3670 if (ctx == NULL)
3671 goto out;
3672
3673 rc = -ENOMEM;
aa8e712c 3674 secattr->domain = kstrdup(sym_name(policydb, SYM_TYPES, ctx->type - 1),
5778eabd 3675 GFP_ATOMIC);
4b02b524
EP		 3676 if (secattr->domain == NULL)
3677 goto out;
3678
8d75899d
PM		 3679 secattr->attr.secid = sid;
3680 secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID;
aa8e712c
SS		 3681 mls_export_netlbl_lvl(policydb, ctx, secattr);
3682 rc = mls_export_netlbl_cat(policydb, ctx, secattr);
4b02b524 3683out:
aa8e712c 3684 read_unlock(&state->ss->policy_rwlock);
f8687afe
PM		 3685 return rc;
3686}
7420ed23 3687#endif /* CONFIG_NETLABEL */
cee74f47
EP		 3688
3689/**
3690 * security_read_policy - read the policy.
3691 * @data: binary policy data
3692 * @len: length of data in bytes
3693 *
3694 */
aa8e712c
SS		 3695int security_read_policy(struct selinux_state *state,
3696 void **data, size_t *len)
cee74f47 3697{
aa8e712c 3698 struct policydb *policydb = &state->ss->policydb;
cee74f47
EP		 3699 int rc;
3700 struct policy_file fp;
3701
aa8e712c 3702 if (!state->initialized)
cee74f47
EP		 3703 return -EINVAL;
3704
aa8e712c 3705 *len = security_policydb_len(state);
cee74f47 3706
845ca30f 3707 *data = vmalloc_user(*len);
cee74f47
EP		 3708 if (!*data)
3709 return -ENOMEM;
3710
3711 fp.data = *data;
3712 fp.len = *len;
3713
aa8e712c
SS		 3714 read_lock(&state->ss->policy_rwlock);
3715 rc = policydb_write(policydb, &fp);
3716 read_unlock(&state->ss->policy_rwlock);
cee74f47
EP		 3717
3718 if (rc)
3719 return rc;
3720
3721 *len = (unsigned long)fp.data - (unsigned long)*data;
3722 return 0;
3723
3724}
Linux 6.x block layer and io_uring tree(s)