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