2 * Implementation of the security services.
4 * Authors : Stephen Smalley, <sds@epoch.ncsc.mil>
5 * James Morris <jmorris@redhat.com>
7 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
9 * Support for enhanced MLS infrastructure.
11 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
13 * Added conditional policy language extensions
15 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
16 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
17 * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation, version 2.
22 #include <linux/kernel.h>
23 #include <linux/slab.h>
24 #include <linux/string.h>
25 #include <linux/spinlock.h>
26 #include <linux/errno.h>
28 #include <linux/sched.h>
29 #include <linux/audit.h>
30 #include <linux/mutex.h>
40 #include "conditional.h"
43 extern void selnl_notify_policyload(u32 seqno);
44 unsigned int policydb_loaded_version;
46 static DEFINE_RWLOCK(policy_rwlock);
47 #define POLICY_RDLOCK read_lock(&policy_rwlock)
48 #define POLICY_WRLOCK write_lock_irq(&policy_rwlock)
49 #define POLICY_RDUNLOCK read_unlock(&policy_rwlock)
50 #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock)
52 static DEFINE_MUTEX(load_mutex);
53 #define LOAD_LOCK mutex_lock(&load_mutex)
54 #define LOAD_UNLOCK mutex_unlock(&load_mutex)
56 static struct sidtab sidtab;
57 struct policydb policydb;
58 int ss_initialized = 0;
61 * The largest sequence number that has been used when
62 * providing an access decision to the access vector cache.
63 * The sequence number only changes when a policy change
66 static u32 latest_granting = 0;
68 /* Forward declaration. */
69 static int context_struct_to_string(struct context *context, char **scontext,
73 * Return the boolean value of a constraint expression
74 * when it is applied to the specified source and target
77 * xcontext is a special beast... It is used by the validatetrans rules
78 * only. For these rules, scontext is the context before the transition,
79 * tcontext is the context after the transition, and xcontext is the context
80 * of the process performing the transition. All other callers of
81 * constraint_expr_eval should pass in NULL for xcontext.
83 static int constraint_expr_eval(struct context *scontext,
84 struct context *tcontext,
85 struct context *xcontext,
86 struct constraint_expr *cexpr)
90 struct role_datum *r1, *r2;
91 struct mls_level *l1, *l2;
92 struct constraint_expr *e;
93 int s[CEXPR_MAXDEPTH];
96 for (e = cexpr; e; e = e->next) {
97 switch (e->expr_type) {
113 if (sp == (CEXPR_MAXDEPTH-1))
117 val1 = scontext->user;
118 val2 = tcontext->user;
121 val1 = scontext->type;
122 val2 = tcontext->type;
125 val1 = scontext->role;
126 val2 = tcontext->role;
127 r1 = policydb.role_val_to_struct[val1 - 1];
128 r2 = policydb.role_val_to_struct[val2 - 1];
131 s[++sp] = ebitmap_get_bit(&r1->dominates,
135 s[++sp] = ebitmap_get_bit(&r2->dominates,
139 s[++sp] = ( !ebitmap_get_bit(&r1->dominates,
141 !ebitmap_get_bit(&r2->dominates,
149 l1 = &(scontext->range.level[0]);
150 l2 = &(tcontext->range.level[0]);
153 l1 = &(scontext->range.level[0]);
154 l2 = &(tcontext->range.level[1]);
157 l1 = &(scontext->range.level[1]);
158 l2 = &(tcontext->range.level[0]);
161 l1 = &(scontext->range.level[1]);
162 l2 = &(tcontext->range.level[1]);
165 l1 = &(scontext->range.level[0]);
166 l2 = &(scontext->range.level[1]);
169 l1 = &(tcontext->range.level[0]);
170 l2 = &(tcontext->range.level[1]);
175 s[++sp] = mls_level_eq(l1, l2);
178 s[++sp] = !mls_level_eq(l1, l2);
181 s[++sp] = mls_level_dom(l1, l2);
184 s[++sp] = mls_level_dom(l2, l1);
187 s[++sp] = mls_level_incomp(l2, l1);
201 s[++sp] = (val1 == val2);
204 s[++sp] = (val1 != val2);
212 if (sp == (CEXPR_MAXDEPTH-1))
215 if (e->attr & CEXPR_TARGET)
217 else if (e->attr & CEXPR_XTARGET) {
224 if (e->attr & CEXPR_USER)
226 else if (e->attr & CEXPR_ROLE)
228 else if (e->attr & CEXPR_TYPE)
237 s[++sp] = ebitmap_get_bit(&e->names, val1 - 1);
240 s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1);
258 * Compute access vectors based on a context structure pair for
259 * the permissions in a particular class.
261 static int context_struct_compute_av(struct context *scontext,
262 struct context *tcontext,
265 struct av_decision *avd)
267 struct constraint_node *constraint;
268 struct role_allow *ra;
269 struct avtab_key avkey;
270 struct avtab_node *node;
271 struct class_datum *tclass_datum;
272 struct ebitmap *sattr, *tattr;
273 struct ebitmap_node *snode, *tnode;
277 * Remap extended Netlink classes for old policy versions.
278 * Do this here rather than socket_type_to_security_class()
279 * in case a newer policy version is loaded, allowing sockets
280 * to remain in the correct class.
282 if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS)
283 if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET &&
284 tclass <= SECCLASS_NETLINK_DNRT_SOCKET)
285 tclass = SECCLASS_NETLINK_SOCKET;
287 if (!tclass || tclass > policydb.p_classes.nprim) {
288 printk(KERN_ERR "security_compute_av: unrecognized class %d\n",
292 tclass_datum = policydb.class_val_to_struct[tclass - 1];
295 * Initialize the access vectors to the default values.
298 avd->decided = 0xffffffff;
300 avd->auditdeny = 0xffffffff;
301 avd->seqno = latest_granting;
304 * If a specific type enforcement rule was defined for
305 * this permission check, then use it.
307 avkey.target_class = tclass;
308 avkey.specified = AVTAB_AV;
309 sattr = &policydb.type_attr_map[scontext->type - 1];
310 tattr = &policydb.type_attr_map[tcontext->type - 1];
311 ebitmap_for_each_bit(sattr, snode, i) {
312 if (!ebitmap_node_get_bit(snode, i))
314 ebitmap_for_each_bit(tattr, tnode, j) {
315 if (!ebitmap_node_get_bit(tnode, j))
317 avkey.source_type = i + 1;
318 avkey.target_type = j + 1;
319 for (node = avtab_search_node(&policydb.te_avtab, &avkey);
321 node = avtab_search_node_next(node, avkey.specified)) {
322 if (node->key.specified == AVTAB_ALLOWED)
323 avd->allowed |= node->datum.data;
324 else if (node->key.specified == AVTAB_AUDITALLOW)
325 avd->auditallow |= node->datum.data;
326 else if (node->key.specified == AVTAB_AUDITDENY)
327 avd->auditdeny &= node->datum.data;
330 /* Check conditional av table for additional permissions */
331 cond_compute_av(&policydb.te_cond_avtab, &avkey, avd);
337 * Remove any permissions prohibited by a constraint (this includes
340 constraint = tclass_datum->constraints;
342 if ((constraint->permissions & (avd->allowed)) &&
343 !constraint_expr_eval(scontext, tcontext, NULL,
345 avd->allowed = (avd->allowed) & ~(constraint->permissions);
347 constraint = constraint->next;
351 * If checking process transition permission and the
352 * role is changing, then check the (current_role, new_role)
355 if (tclass == SECCLASS_PROCESS &&
356 (avd->allowed & (PROCESS__TRANSITION | PROCESS__DYNTRANSITION)) &&
357 scontext->role != tcontext->role) {
358 for (ra = policydb.role_allow; ra; ra = ra->next) {
359 if (scontext->role == ra->role &&
360 tcontext->role == ra->new_role)
364 avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION |
365 PROCESS__DYNTRANSITION);
371 static int security_validtrans_handle_fail(struct context *ocontext,
372 struct context *ncontext,
373 struct context *tcontext,
376 char *o = NULL, *n = NULL, *t = NULL;
377 u32 olen, nlen, tlen;
379 if (context_struct_to_string(ocontext, &o, &olen) < 0)
381 if (context_struct_to_string(ncontext, &n, &nlen) < 0)
383 if (context_struct_to_string(tcontext, &t, &tlen) < 0)
385 audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
386 "security_validate_transition: denied for"
387 " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s",
388 o, n, t, policydb.p_class_val_to_name[tclass-1]);
394 if (!selinux_enforcing)
399 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
402 struct context *ocontext;
403 struct context *ncontext;
404 struct context *tcontext;
405 struct class_datum *tclass_datum;
406 struct constraint_node *constraint;
415 * Remap extended Netlink classes for old policy versions.
416 * Do this here rather than socket_type_to_security_class()
417 * in case a newer policy version is loaded, allowing sockets
418 * to remain in the correct class.
420 if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS)
421 if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET &&
422 tclass <= SECCLASS_NETLINK_DNRT_SOCKET)
423 tclass = SECCLASS_NETLINK_SOCKET;
425 if (!tclass || tclass > policydb.p_classes.nprim) {
426 printk(KERN_ERR "security_validate_transition: "
427 "unrecognized class %d\n", tclass);
431 tclass_datum = policydb.class_val_to_struct[tclass - 1];
433 ocontext = sidtab_search(&sidtab, oldsid);
435 printk(KERN_ERR "security_validate_transition: "
436 " unrecognized SID %d\n", oldsid);
441 ncontext = sidtab_search(&sidtab, newsid);
443 printk(KERN_ERR "security_validate_transition: "
444 " unrecognized SID %d\n", newsid);
449 tcontext = sidtab_search(&sidtab, tasksid);
451 printk(KERN_ERR "security_validate_transition: "
452 " unrecognized SID %d\n", tasksid);
457 constraint = tclass_datum->validatetrans;
459 if (!constraint_expr_eval(ocontext, ncontext, tcontext,
461 rc = security_validtrans_handle_fail(ocontext, ncontext,
465 constraint = constraint->next;
474 * security_compute_av - Compute access vector decisions.
475 * @ssid: source security identifier
476 * @tsid: target security identifier
477 * @tclass: target security class
478 * @requested: requested permissions
479 * @avd: access vector decisions
481 * Compute a set of access vector decisions based on the
482 * SID pair (@ssid, @tsid) for the permissions in @tclass.
483 * Return -%EINVAL if any of the parameters are invalid or %0
484 * if the access vector decisions were computed successfully.
486 int security_compute_av(u32 ssid,
490 struct av_decision *avd)
492 struct context *scontext = NULL, *tcontext = NULL;
495 if (!ss_initialized) {
496 avd->allowed = 0xffffffff;
497 avd->decided = 0xffffffff;
499 avd->auditdeny = 0xffffffff;
500 avd->seqno = latest_granting;
506 scontext = sidtab_search(&sidtab, ssid);
508 printk(KERN_ERR "security_compute_av: unrecognized SID %d\n",
513 tcontext = sidtab_search(&sidtab, tsid);
515 printk(KERN_ERR "security_compute_av: unrecognized SID %d\n",
521 rc = context_struct_compute_av(scontext, tcontext, tclass,
529 * Write the security context string representation of
530 * the context structure `context' into a dynamically
531 * allocated string of the correct size. Set `*scontext'
532 * to point to this string and set `*scontext_len' to
533 * the length of the string.
535 static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len)
542 /* Compute the size of the context. */
543 *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1;
544 *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1;
545 *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1;
546 *scontext_len += mls_compute_context_len(context);
548 /* Allocate space for the context; caller must free this space. */
549 scontextp = kmalloc(*scontext_len, GFP_ATOMIC);
553 *scontext = scontextp;
556 * Copy the user name, role name and type name into the context.
558 sprintf(scontextp, "%s:%s:%s",
559 policydb.p_user_val_to_name[context->user - 1],
560 policydb.p_role_val_to_name[context->role - 1],
561 policydb.p_type_val_to_name[context->type - 1]);
562 scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) +
563 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) +
564 1 + strlen(policydb.p_type_val_to_name[context->type - 1]);
566 mls_sid_to_context(context, &scontextp);
573 #include "initial_sid_to_string.h"
576 * security_sid_to_context - Obtain a context for a given SID.
577 * @sid: security identifier, SID
578 * @scontext: security context
579 * @scontext_len: length in bytes
581 * Write the string representation of the context associated with @sid
582 * into a dynamically allocated string of the correct size. Set @scontext
583 * to point to this string and set @scontext_len to the length of the string.
585 int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len)
587 struct context *context;
590 if (!ss_initialized) {
591 if (sid <= SECINITSID_NUM) {
594 *scontext_len = strlen(initial_sid_to_string[sid]) + 1;
595 scontextp = kmalloc(*scontext_len,GFP_ATOMIC);
596 strcpy(scontextp, initial_sid_to_string[sid]);
597 *scontext = scontextp;
600 printk(KERN_ERR "security_sid_to_context: called before initial "
601 "load_policy on unknown SID %d\n", sid);
606 context = sidtab_search(&sidtab, sid);
608 printk(KERN_ERR "security_sid_to_context: unrecognized SID "
613 rc = context_struct_to_string(context, scontext, scontext_len);
621 static int security_context_to_sid_core(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid)
624 struct context context;
625 struct role_datum *role;
626 struct type_datum *typdatum;
627 struct user_datum *usrdatum;
628 char *scontextp, *p, oldc;
631 if (!ss_initialized) {
634 for (i = 1; i < SECINITSID_NUM; i++) {
635 if (!strcmp(initial_sid_to_string[i], scontext)) {
640 *sid = SECINITSID_KERNEL;
645 /* Copy the string so that we can modify the copy as we parse it.
646 The string should already by null terminated, but we append a
647 null suffix to the copy to avoid problems with the existing
648 attr package, which doesn't view the null terminator as part
649 of the attribute value. */
650 scontext2 = kmalloc(scontext_len+1,GFP_KERNEL);
655 memcpy(scontext2, scontext, scontext_len);
656 scontext2[scontext_len] = 0;
658 context_init(&context);
663 /* Parse the security context. */
666 scontextp = (char *) scontext2;
668 /* Extract the user. */
670 while (*p && *p != ':')
678 usrdatum = hashtab_search(policydb.p_users.table, scontextp);
682 context.user = usrdatum->value;
686 while (*p && *p != ':')
694 role = hashtab_search(policydb.p_roles.table, scontextp);
697 context.role = role->value;
701 while (*p && *p != ':')
706 typdatum = hashtab_search(policydb.p_types.table, scontextp);
710 context.type = typdatum->value;
712 rc = mls_context_to_sid(oldc, &p, &context, &sidtab, def_sid);
716 if ((p - scontext2) < scontext_len) {
721 /* Check the validity of the new context. */
722 if (!policydb_context_isvalid(&policydb, &context)) {
726 /* Obtain the new sid. */
727 rc = sidtab_context_to_sid(&sidtab, &context, sid);
730 context_destroy(&context);
737 * security_context_to_sid - Obtain a SID for a given security context.
738 * @scontext: security context
739 * @scontext_len: length in bytes
740 * @sid: security identifier, SID
742 * Obtains a SID associated with the security context that
743 * has the string representation specified by @scontext.
744 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
745 * memory is available, or 0 on success.
747 int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid)
749 return security_context_to_sid_core(scontext, scontext_len,
754 * security_context_to_sid_default - Obtain a SID for a given security context,
755 * falling back to specified default if needed.
757 * @scontext: security context
758 * @scontext_len: length in bytes
759 * @sid: security identifier, SID
760 * @def_sid: default SID to assign on errror
762 * Obtains a SID associated with the security context that
763 * has the string representation specified by @scontext.
764 * The default SID is passed to the MLS layer to be used to allow
765 * kernel labeling of the MLS field if the MLS field is not present
766 * (for upgrading to MLS without full relabel).
767 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
768 * memory is available, or 0 on success.
770 int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid)
772 return security_context_to_sid_core(scontext, scontext_len,
776 static int compute_sid_handle_invalid_context(
777 struct context *scontext,
778 struct context *tcontext,
780 struct context *newcontext)
782 char *s = NULL, *t = NULL, *n = NULL;
783 u32 slen, tlen, nlen;
785 if (context_struct_to_string(scontext, &s, &slen) < 0)
787 if (context_struct_to_string(tcontext, &t, &tlen) < 0)
789 if (context_struct_to_string(newcontext, &n, &nlen) < 0)
791 audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
792 "security_compute_sid: invalid context %s"
796 n, s, t, policydb.p_class_val_to_name[tclass-1]);
801 if (!selinux_enforcing)
806 static int security_compute_sid(u32 ssid,
812 struct context *scontext = NULL, *tcontext = NULL, newcontext;
813 struct role_trans *roletr = NULL;
814 struct avtab_key avkey;
815 struct avtab_datum *avdatum;
816 struct avtab_node *node;
819 if (!ss_initialized) {
821 case SECCLASS_PROCESS:
833 scontext = sidtab_search(&sidtab, ssid);
835 printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n",
840 tcontext = sidtab_search(&sidtab, tsid);
842 printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n",
848 context_init(&newcontext);
850 /* Set the user identity. */
852 case AVTAB_TRANSITION:
854 /* Use the process user identity. */
855 newcontext.user = scontext->user;
858 /* Use the related object owner. */
859 newcontext.user = tcontext->user;
863 /* Set the role and type to default values. */
865 case SECCLASS_PROCESS:
866 /* Use the current role and type of process. */
867 newcontext.role = scontext->role;
868 newcontext.type = scontext->type;
871 /* Use the well-defined object role. */
872 newcontext.role = OBJECT_R_VAL;
873 /* Use the type of the related object. */
874 newcontext.type = tcontext->type;
877 /* Look for a type transition/member/change rule. */
878 avkey.source_type = scontext->type;
879 avkey.target_type = tcontext->type;
880 avkey.target_class = tclass;
881 avkey.specified = specified;
882 avdatum = avtab_search(&policydb.te_avtab, &avkey);
884 /* If no permanent rule, also check for enabled conditional rules */
886 node = avtab_search_node(&policydb.te_cond_avtab, &avkey);
887 for (; node != NULL; node = avtab_search_node_next(node, specified)) {
888 if (node->key.specified & AVTAB_ENABLED) {
889 avdatum = &node->datum;
896 /* Use the type from the type transition/member/change rule. */
897 newcontext.type = avdatum->data;
900 /* Check for class-specific changes. */
902 case SECCLASS_PROCESS:
903 if (specified & AVTAB_TRANSITION) {
904 /* Look for a role transition rule. */
905 for (roletr = policydb.role_tr; roletr;
906 roletr = roletr->next) {
907 if (roletr->role == scontext->role &&
908 roletr->type == tcontext->type) {
909 /* Use the role transition rule. */
910 newcontext.role = roletr->new_role;
920 /* Set the MLS attributes.
921 This is done last because it may allocate memory. */
922 rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext);
926 /* Check the validity of the context. */
927 if (!policydb_context_isvalid(&policydb, &newcontext)) {
928 rc = compute_sid_handle_invalid_context(scontext,
935 /* Obtain the sid for the context. */
936 rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid);
939 context_destroy(&newcontext);
945 * security_transition_sid - Compute the SID for a new subject/object.
946 * @ssid: source security identifier
947 * @tsid: target security identifier
948 * @tclass: target security class
949 * @out_sid: security identifier for new subject/object
951 * Compute a SID to use for labeling a new subject or object in the
952 * class @tclass based on a SID pair (@ssid, @tsid).
953 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
954 * if insufficient memory is available, or %0 if the new SID was
955 * computed successfully.
957 int security_transition_sid(u32 ssid,
962 return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid);
966 * security_member_sid - Compute the SID for member selection.
967 * @ssid: source security identifier
968 * @tsid: target security identifier
969 * @tclass: target security class
970 * @out_sid: security identifier for selected member
972 * Compute a SID to use when selecting a member of a polyinstantiated
973 * object of class @tclass based on a SID pair (@ssid, @tsid).
974 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
975 * if insufficient memory is available, or %0 if the SID was
976 * computed successfully.
978 int security_member_sid(u32 ssid,
983 return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid);
987 * security_change_sid - Compute the SID for object relabeling.
988 * @ssid: source security identifier
989 * @tsid: target security identifier
990 * @tclass: target security class
991 * @out_sid: security identifier for selected member
993 * Compute a SID to use for relabeling an object of class @tclass
994 * based on a SID pair (@ssid, @tsid).
995 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
996 * if insufficient memory is available, or %0 if the SID was
997 * computed successfully.
999 int security_change_sid(u32 ssid,
1004 return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid);
1008 * Verify that each permission that is defined under the
1009 * existing policy is still defined with the same value
1010 * in the new policy.
1012 static int validate_perm(void *key, void *datum, void *p)
1015 struct perm_datum *perdatum, *perdatum2;
1022 perdatum2 = hashtab_search(h, key);
1024 printk(KERN_ERR "security: permission %s disappeared",
1029 if (perdatum->value != perdatum2->value) {
1030 printk(KERN_ERR "security: the value of permission %s changed",
1039 * Verify that each class that is defined under the
1040 * existing policy is still defined with the same
1041 * attributes in the new policy.
1043 static int validate_class(void *key, void *datum, void *p)
1045 struct policydb *newp;
1046 struct class_datum *cladatum, *cladatum2;
1052 cladatum2 = hashtab_search(newp->p_classes.table, key);
1054 printk(KERN_ERR "security: class %s disappeared\n",
1059 if (cladatum->value != cladatum2->value) {
1060 printk(KERN_ERR "security: the value of class %s changed\n",
1065 if ((cladatum->comdatum && !cladatum2->comdatum) ||
1066 (!cladatum->comdatum && cladatum2->comdatum)) {
1067 printk(KERN_ERR "security: the inherits clause for the access "
1068 "vector definition for class %s changed\n", (char *)key);
1072 if (cladatum->comdatum) {
1073 rc = hashtab_map(cladatum->comdatum->permissions.table, validate_perm,
1074 cladatum2->comdatum->permissions.table);
1076 printk(" in the access vector definition for class "
1077 "%s\n", (char *)key);
1081 rc = hashtab_map(cladatum->permissions.table, validate_perm,
1082 cladatum2->permissions.table);
1084 printk(" in access vector definition for class %s\n",
1090 /* Clone the SID into the new SID table. */
1091 static int clone_sid(u32 sid,
1092 struct context *context,
1095 struct sidtab *s = arg;
1097 return sidtab_insert(s, sid, context);
1100 static inline int convert_context_handle_invalid_context(struct context *context)
1104 if (selinux_enforcing) {
1110 context_struct_to_string(context, &s, &len);
1111 printk(KERN_ERR "security: context %s is invalid\n", s);
1117 struct convert_context_args {
1118 struct policydb *oldp;
1119 struct policydb *newp;
1123 * Convert the values in the security context
1124 * structure `c' from the values specified
1125 * in the policy `p->oldp' to the values specified
1126 * in the policy `p->newp'. Verify that the
1127 * context is valid under the new policy.
1129 static int convert_context(u32 key,
1133 struct convert_context_args *args;
1134 struct context oldc;
1135 struct role_datum *role;
1136 struct type_datum *typdatum;
1137 struct user_datum *usrdatum;
1144 rc = context_cpy(&oldc, c);
1150 /* Convert the user. */
1151 usrdatum = hashtab_search(args->newp->p_users.table,
1152 args->oldp->p_user_val_to_name[c->user - 1]);
1156 c->user = usrdatum->value;
1158 /* Convert the role. */
1159 role = hashtab_search(args->newp->p_roles.table,
1160 args->oldp->p_role_val_to_name[c->role - 1]);
1164 c->role = role->value;
1166 /* Convert the type. */
1167 typdatum = hashtab_search(args->newp->p_types.table,
1168 args->oldp->p_type_val_to_name[c->type - 1]);
1172 c->type = typdatum->value;
1174 rc = mls_convert_context(args->oldp, args->newp, c);
1178 /* Check the validity of the new context. */
1179 if (!policydb_context_isvalid(args->newp, c)) {
1180 rc = convert_context_handle_invalid_context(&oldc);
1185 context_destroy(&oldc);
1189 context_struct_to_string(&oldc, &s, &len);
1190 context_destroy(&oldc);
1191 printk(KERN_ERR "security: invalidating context %s\n", s);
1196 extern void selinux_complete_init(void);
1199 * security_load_policy - Load a security policy configuration.
1200 * @data: binary policy data
1201 * @len: length of data in bytes
1203 * Load a new set of security policy configuration data,
1204 * validate it and convert the SID table as necessary.
1205 * This function will flush the access vector cache after
1206 * loading the new policy.
1208 int security_load_policy(void *data, size_t len)
1210 struct policydb oldpolicydb, newpolicydb;
1211 struct sidtab oldsidtab, newsidtab;
1212 struct convert_context_args args;
1215 struct policy_file file = { data, len }, *fp = &file;
1219 if (!ss_initialized) {
1221 if (policydb_read(&policydb, fp)) {
1223 avtab_cache_destroy();
1226 if (policydb_load_isids(&policydb, &sidtab)) {
1228 policydb_destroy(&policydb);
1229 avtab_cache_destroy();
1232 policydb_loaded_version = policydb.policyvers;
1234 seqno = ++latest_granting;
1236 selinux_complete_init();
1237 avc_ss_reset(seqno);
1238 selnl_notify_policyload(seqno);
1243 sidtab_hash_eval(&sidtab, "sids");
1246 if (policydb_read(&newpolicydb, fp)) {
1251 sidtab_init(&newsidtab);
1253 /* Verify that the existing classes did not change. */
1254 if (hashtab_map(policydb.p_classes.table, validate_class, &newpolicydb)) {
1255 printk(KERN_ERR "security: the definition of an existing "
1261 /* Clone the SID table. */
1262 sidtab_shutdown(&sidtab);
1263 if (sidtab_map(&sidtab, clone_sid, &newsidtab)) {
1268 /* Convert the internal representations of contexts
1269 in the new SID table and remove invalid SIDs. */
1270 args.oldp = &policydb;
1271 args.newp = &newpolicydb;
1272 sidtab_map_remove_on_error(&newsidtab, convert_context, &args);
1274 /* Save the old policydb and SID table to free later. */
1275 memcpy(&oldpolicydb, &policydb, sizeof policydb);
1276 sidtab_set(&oldsidtab, &sidtab);
1278 /* Install the new policydb and SID table. */
1280 memcpy(&policydb, &newpolicydb, sizeof policydb);
1281 sidtab_set(&sidtab, &newsidtab);
1282 seqno = ++latest_granting;
1283 policydb_loaded_version = policydb.policyvers;
1287 /* Free the old policydb and SID table. */
1288 policydb_destroy(&oldpolicydb);
1289 sidtab_destroy(&oldsidtab);
1291 avc_ss_reset(seqno);
1292 selnl_notify_policyload(seqno);
1298 sidtab_destroy(&newsidtab);
1299 policydb_destroy(&newpolicydb);
1305 * security_port_sid - Obtain the SID for a port.
1306 * @domain: communication domain aka address family
1307 * @type: socket type
1308 * @protocol: protocol number
1309 * @port: port number
1310 * @out_sid: security identifier
1312 int security_port_sid(u16 domain,
1323 c = policydb.ocontexts[OCON_PORT];
1325 if (c->u.port.protocol == protocol &&
1326 c->u.port.low_port <= port &&
1327 c->u.port.high_port >= port)
1334 rc = sidtab_context_to_sid(&sidtab,
1340 *out_sid = c->sid[0];
1342 *out_sid = SECINITSID_PORT;
1351 * security_netif_sid - Obtain the SID for a network interface.
1352 * @name: interface name
1353 * @if_sid: interface SID
1354 * @msg_sid: default SID for received packets
1356 int security_netif_sid(char *name,
1365 c = policydb.ocontexts[OCON_NETIF];
1367 if (strcmp(name, c->u.name) == 0)
1373 if (!c->sid[0] || !c->sid[1]) {
1374 rc = sidtab_context_to_sid(&sidtab,
1379 rc = sidtab_context_to_sid(&sidtab,
1385 *if_sid = c->sid[0];
1386 *msg_sid = c->sid[1];
1388 *if_sid = SECINITSID_NETIF;
1389 *msg_sid = SECINITSID_NETMSG;
1397 static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask)
1401 for(i = 0; i < 4; i++)
1402 if(addr[i] != (input[i] & mask[i])) {
1411 * security_node_sid - Obtain the SID for a node (host).
1412 * @domain: communication domain aka address family
1414 * @addrlen: address length in bytes
1415 * @out_sid: security identifier
1417 int security_node_sid(u16 domain,
1431 if (addrlen != sizeof(u32)) {
1436 addr = *((u32 *)addrp);
1438 c = policydb.ocontexts[OCON_NODE];
1440 if (c->u.node.addr == (addr & c->u.node.mask))
1448 if (addrlen != sizeof(u64) * 2) {
1452 c = policydb.ocontexts[OCON_NODE6];
1454 if (match_ipv6_addrmask(addrp, c->u.node6.addr,
1462 *out_sid = SECINITSID_NODE;
1468 rc = sidtab_context_to_sid(&sidtab,
1474 *out_sid = c->sid[0];
1476 *out_sid = SECINITSID_NODE;
1487 * security_get_user_sids - Obtain reachable SIDs for a user.
1488 * @fromsid: starting SID
1489 * @username: username
1490 * @sids: array of reachable SIDs for user
1491 * @nel: number of elements in @sids
1493 * Generate the set of SIDs for legal security contexts
1494 * for a given user that can be reached by @fromsid.
1495 * Set *@sids to point to a dynamically allocated
1496 * array containing the set of SIDs. Set *@nel to the
1497 * number of elements in the array.
1500 int security_get_user_sids(u32 fromsid,
1505 struct context *fromcon, usercon;
1506 u32 *mysids, *mysids2, sid;
1507 u32 mynel = 0, maxnel = SIDS_NEL;
1508 struct user_datum *user;
1509 struct role_datum *role;
1510 struct av_decision avd;
1511 struct ebitmap_node *rnode, *tnode;
1514 if (!ss_initialized) {
1522 fromcon = sidtab_search(&sidtab, fromsid);
1528 user = hashtab_search(policydb.p_users.table, username);
1533 usercon.user = user->value;
1535 mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC);
1541 ebitmap_for_each_bit(&user->roles, rnode, i) {
1542 if (!ebitmap_node_get_bit(rnode, i))
1544 role = policydb.role_val_to_struct[i];
1546 ebitmap_for_each_bit(&role->types, tnode, j) {
1547 if (!ebitmap_node_get_bit(tnode, j))
1551 if (mls_setup_user_range(fromcon, user, &usercon))
1554 rc = context_struct_compute_av(fromcon, &usercon,
1556 PROCESS__TRANSITION,
1558 if (rc || !(avd.allowed & PROCESS__TRANSITION))
1560 rc = sidtab_context_to_sid(&sidtab, &usercon, &sid);
1565 if (mynel < maxnel) {
1566 mysids[mynel++] = sid;
1569 mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC);
1575 memcpy(mysids2, mysids, mynel * sizeof(*mysids2));
1578 mysids[mynel++] = sid;
1593 * security_genfs_sid - Obtain a SID for a file in a filesystem
1594 * @fstype: filesystem type
1595 * @path: path from root of mount
1596 * @sclass: file security class
1597 * @sid: SID for path
1599 * Obtain a SID to use for a file in a filesystem that
1600 * cannot support xattr or use a fixed labeling behavior like
1601 * transition SIDs or task SIDs.
1603 int security_genfs_sid(const char *fstype,
1609 struct genfs *genfs;
1611 int rc = 0, cmp = 0;
1615 for (genfs = policydb.genfs; genfs; genfs = genfs->next) {
1616 cmp = strcmp(fstype, genfs->fstype);
1621 if (!genfs || cmp) {
1622 *sid = SECINITSID_UNLABELED;
1627 for (c = genfs->head; c; c = c->next) {
1628 len = strlen(c->u.name);
1629 if ((!c->v.sclass || sclass == c->v.sclass) &&
1630 (strncmp(c->u.name, path, len) == 0))
1635 *sid = SECINITSID_UNLABELED;
1641 rc = sidtab_context_to_sid(&sidtab,
1655 * security_fs_use - Determine how to handle labeling for a filesystem.
1656 * @fstype: filesystem type
1657 * @behavior: labeling behavior
1658 * @sid: SID for filesystem (superblock)
1660 int security_fs_use(
1662 unsigned int *behavior,
1670 c = policydb.ocontexts[OCON_FSUSE];
1672 if (strcmp(fstype, c->u.name) == 0)
1678 *behavior = c->v.behavior;
1680 rc = sidtab_context_to_sid(&sidtab,
1688 rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid);
1690 *behavior = SECURITY_FS_USE_NONE;
1693 *behavior = SECURITY_FS_USE_GENFS;
1702 int security_get_bools(int *len, char ***names, int **values)
1704 int i, rc = -ENOMEM;
1710 *len = policydb.p_bools.nprim;
1716 *names = kcalloc(*len, sizeof(char*), GFP_ATOMIC);
1720 *values = kcalloc(*len, sizeof(int), GFP_ATOMIC);
1724 for (i = 0; i < *len; i++) {
1726 (*values)[i] = policydb.bool_val_to_struct[i]->state;
1727 name_len = strlen(policydb.p_bool_val_to_name[i]) + 1;
1728 (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC);
1731 strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len);
1732 (*names)[i][name_len - 1] = 0;
1740 for (i = 0; i < *len; i++)
1748 int security_set_bools(int len, int *values)
1751 int lenp, seqno = 0;
1752 struct cond_node *cur;
1756 lenp = policydb.p_bools.nprim;
1762 for (i = 0; i < len; i++) {
1763 if (!!values[i] != policydb.bool_val_to_struct[i]->state) {
1764 audit_log(current->audit_context, GFP_ATOMIC,
1765 AUDIT_MAC_CONFIG_CHANGE,
1766 "bool=%s val=%d old_val=%d auid=%u",
1767 policydb.p_bool_val_to_name[i],
1769 policydb.bool_val_to_struct[i]->state,
1770 audit_get_loginuid(current->audit_context));
1773 policydb.bool_val_to_struct[i]->state = 1;
1775 policydb.bool_val_to_struct[i]->state = 0;
1779 for (cur = policydb.cond_list; cur != NULL; cur = cur->next) {
1780 rc = evaluate_cond_node(&policydb, cur);
1785 seqno = ++latest_granting;
1790 avc_ss_reset(seqno);
1791 selnl_notify_policyload(seqno);
1796 int security_get_bool_value(int bool)
1803 len = policydb.p_bools.nprim;
1809 rc = policydb.bool_val_to_struct[bool]->state;