2 * Implementation of the security services.
4 * Authors : Stephen Smalley, <sds@epoch.ncsc.mil>
5 * James Morris <jmorris@redhat.com>
7 * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2,
11 * as published by the Free Software Foundation.
13 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
15 * Added conditional policy language extensions
17 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
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 <asm/semaphore.h>
39 #include "conditional.h"
42 extern void selnl_notify_policyload(u32 seqno);
43 extern int policydb_loaded_version;
45 static rwlock_t policy_rwlock = RW_LOCK_UNLOCKED;
46 #define POLICY_RDLOCK read_lock(&policy_rwlock)
47 #define POLICY_WRLOCK write_lock_irq(&policy_rwlock)
48 #define POLICY_RDUNLOCK read_unlock(&policy_rwlock)
49 #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock)
51 static DECLARE_MUTEX(load_sem);
52 #define LOAD_LOCK down(&load_sem)
53 #define LOAD_UNLOCK up(&load_sem)
56 struct policydb policydb;
57 int ss_initialized = 0;
60 * The largest sequence number that has been used when
61 * providing an access decision to the access vector cache.
62 * The sequence number only changes when a policy change
65 static u32 latest_granting = 0;
68 * Return the boolean value of a constraint expression
69 * when it is applied to the specified source and target
72 static int constraint_expr_eval(struct context *scontext,
73 struct context *tcontext,
74 struct constraint_expr *cexpr)
78 struct role_datum *r1, *r2;
79 struct constraint_expr *e;
80 int s[CEXPR_MAXDEPTH];
83 for (e = cexpr; e; e = e->next) {
84 switch (e->expr_type) {
100 if (sp == (CEXPR_MAXDEPTH-1))
104 val1 = scontext->user;
105 val2 = tcontext->user;
108 val1 = scontext->type;
109 val2 = tcontext->type;
112 val1 = scontext->role;
113 val2 = tcontext->role;
114 r1 = policydb.role_val_to_struct[val1 - 1];
115 r2 = policydb.role_val_to_struct[val2 - 1];
118 s[++sp] = ebitmap_get_bit(&r1->dominates,
122 s[++sp] = ebitmap_get_bit(&r2->dominates,
126 s[++sp] = ( !ebitmap_get_bit(&r1->dominates,
128 !ebitmap_get_bit(&r2->dominates,
142 s[++sp] = (val1 == val2);
145 s[++sp] = (val1 != val2);
153 if (sp == (CEXPR_MAXDEPTH-1))
156 if (e->attr & CEXPR_TARGET)
158 if (e->attr & CEXPR_USER)
160 else if (e->attr & CEXPR_ROLE)
162 else if (e->attr & CEXPR_TYPE)
171 s[++sp] = ebitmap_get_bit(&e->names, val1 - 1);
174 s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1);
192 * Compute access vectors based on a context structure pair for
193 * the permissions in a particular class.
195 static int context_struct_compute_av(struct context *scontext,
196 struct context *tcontext,
199 struct av_decision *avd)
201 struct constraint_node *constraint;
202 struct role_allow *ra;
203 struct avtab_key avkey;
204 struct avtab_datum *avdatum;
205 struct class_datum *tclass_datum;
208 * Remap extended Netlink classes for old policy versions.
209 * Do this here rather than socket_type_to_security_class()
210 * in case a newer policy version is loaded, allowing sockets
211 * to remain in the correct class.
213 if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS)
214 if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET &&
215 tclass <= SECCLASS_NETLINK_DNRT_SOCKET)
216 tclass = SECCLASS_NETLINK_SOCKET;
218 if (!tclass || tclass > policydb.p_classes.nprim) {
219 printk(KERN_ERR "security_compute_av: unrecognized class %d\n",
223 tclass_datum = policydb.class_val_to_struct[tclass - 1];
226 * Initialize the access vectors to the default values.
229 avd->decided = 0xffffffff;
231 avd->auditdeny = 0xffffffff;
232 avd->seqno = latest_granting;
235 * If a specific type enforcement rule was defined for
236 * this permission check, then use it.
238 avkey.source_type = scontext->type;
239 avkey.target_type = tcontext->type;
240 avkey.target_class = tclass;
241 avdatum = avtab_search(&policydb.te_avtab, &avkey, AVTAB_AV);
243 if (avdatum->specified & AVTAB_ALLOWED)
244 avd->allowed = avtab_allowed(avdatum);
245 if (avdatum->specified & AVTAB_AUDITDENY)
246 avd->auditdeny = avtab_auditdeny(avdatum);
247 if (avdatum->specified & AVTAB_AUDITALLOW)
248 avd->auditallow = avtab_auditallow(avdatum);
251 /* Check conditional av table for additional permissions */
252 cond_compute_av(&policydb.te_cond_avtab, &avkey, avd);
255 * Remove any permissions prohibited by the MLS policy.
257 mls_compute_av(scontext, tcontext, tclass_datum, &avd->allowed);
260 * Remove any permissions prohibited by a constraint.
262 constraint = tclass_datum->constraints;
264 if ((constraint->permissions & (avd->allowed)) &&
265 !constraint_expr_eval(scontext, tcontext,
267 avd->allowed = (avd->allowed) & ~(constraint->permissions);
269 constraint = constraint->next;
273 * If checking process transition permission and the
274 * role is changing, then check the (current_role, new_role)
277 if (tclass == SECCLASS_PROCESS &&
278 (avd->allowed & PROCESS__TRANSITION) &&
279 scontext->role != tcontext->role) {
280 for (ra = policydb.role_allow; ra; ra = ra->next) {
281 if (scontext->role == ra->role &&
282 tcontext->role == ra->new_role)
286 avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION);
293 * security_compute_av - Compute access vector decisions.
294 * @ssid: source security identifier
295 * @tsid: target security identifier
296 * @tclass: target security class
297 * @requested: requested permissions
298 * @avd: access vector decisions
300 * Compute a set of access vector decisions based on the
301 * SID pair (@ssid, @tsid) for the permissions in @tclass.
302 * Return -%EINVAL if any of the parameters are invalid or %0
303 * if the access vector decisions were computed successfully.
305 int security_compute_av(u32 ssid,
309 struct av_decision *avd)
311 struct context *scontext = NULL, *tcontext = NULL;
314 if (!ss_initialized) {
315 avd->allowed = requested;
316 avd->decided = requested;
318 avd->auditdeny = 0xffffffff;
319 avd->seqno = latest_granting;
325 scontext = sidtab_search(&sidtab, ssid);
327 printk(KERN_ERR "security_compute_av: unrecognized SID %d\n",
332 tcontext = sidtab_search(&sidtab, tsid);
334 printk(KERN_ERR "security_compute_av: unrecognized SID %d\n",
340 rc = context_struct_compute_av(scontext, tcontext, tclass,
348 * Write the security context string representation of
349 * the context structure `context' into a dynamically
350 * allocated string of the correct size. Set `*scontext'
351 * to point to this string and set `*scontext_len' to
352 * the length of the string.
354 int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len)
361 /* Compute the size of the context. */
362 *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1;
363 *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1;
364 *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1;
365 *scontext_len += mls_compute_context_len(context);
367 /* Allocate space for the context; caller must free this space. */
368 scontextp = kmalloc(*scontext_len+1,GFP_ATOMIC);
372 *scontext = scontextp;
375 * Copy the user name, role name and type name into the context.
377 sprintf(scontextp, "%s:%s:%s:",
378 policydb.p_user_val_to_name[context->user - 1],
379 policydb.p_role_val_to_name[context->role - 1],
380 policydb.p_type_val_to_name[context->type - 1]);
381 scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) +
382 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) +
383 1 + strlen(policydb.p_type_val_to_name[context->type - 1]) + 1;
385 mls_sid_to_context(context, &scontextp);
393 #include "initial_sid_to_string.h"
396 * security_sid_to_context - Obtain a context for a given SID.
397 * @sid: security identifier, SID
398 * @scontext: security context
399 * @scontext_len: length in bytes
401 * Write the string representation of the context associated with @sid
402 * into a dynamically allocated string of the correct size. Set @scontext
403 * to point to this string and set @scontext_len to the length of the string.
405 int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len)
407 struct context *context;
410 if (!ss_initialized) {
411 if (sid <= SECINITSID_NUM) {
414 *scontext_len = strlen(initial_sid_to_string[sid]) + 1;
415 scontextp = kmalloc(*scontext_len,GFP_ATOMIC);
416 strcpy(scontextp, initial_sid_to_string[sid]);
417 *scontext = scontextp;
420 printk(KERN_ERR "security_sid_to_context: called before initial "
421 "load_policy on unknown SID %d\n", sid);
426 context = sidtab_search(&sidtab, sid);
428 printk(KERN_ERR "security_sid_to_context: unrecognized SID "
433 rc = context_struct_to_string(context, scontext, scontext_len);
442 * security_context_to_sid - Obtain a SID for a given security context.
443 * @scontext: security context
444 * @scontext_len: length in bytes
445 * @sid: security identifier, SID
447 * Obtains a SID associated with the security context that
448 * has the string representation specified by @scontext.
449 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
450 * memory is available, or 0 on success.
452 int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid)
455 struct context context;
456 struct role_datum *role;
457 struct type_datum *typdatum;
458 struct user_datum *usrdatum;
459 char *scontextp, *p, oldc;
462 if (!ss_initialized) {
465 for (i = 1; i < SECINITSID_NUM; i++) {
466 if (!strcmp(initial_sid_to_string[i], scontext)) {
471 *sid = SECINITSID_KERNEL;
476 /* Copy the string so that we can modify the copy as we parse it.
477 The string should already by null terminated, but we append a
478 null suffix to the copy to avoid problems with the existing
479 attr package, which doesn't view the null terminator as part
480 of the attribute value. */
481 scontext2 = kmalloc(scontext_len+1,GFP_KERNEL);
486 memcpy(scontext2, scontext, scontext_len);
487 scontext2[scontext_len] = 0;
489 context_init(&context);
494 /* Parse the security context. */
497 scontextp = (char *) scontext2;
499 /* Extract the user. */
501 while (*p && *p != ':')
509 usrdatum = hashtab_search(policydb.p_users.table, scontextp);
513 context.user = usrdatum->value;
517 while (*p && *p != ':')
525 role = hashtab_search(policydb.p_roles.table, scontextp);
528 context.role = role->value;
532 while (*p && *p != ':')
537 typdatum = hashtab_search(policydb.p_types.table, scontextp);
541 context.type = typdatum->value;
543 rc = mls_context_to_sid(oldc, &p, &context);
547 if ((p - scontext2) < scontext_len) {
552 /* Check the validity of the new context. */
553 if (!policydb_context_isvalid(&policydb, &context)) {
557 /* Obtain the new sid. */
558 rc = sidtab_context_to_sid(&sidtab, &context, sid);
561 context_destroy(&context);
567 static int compute_sid_handle_invalid_context(
568 struct context *scontext,
569 struct context *tcontext,
571 struct context *newcontext)
573 char *s = NULL, *t = NULL, *n = NULL;
574 u32 slen, tlen, nlen;
576 if (context_struct_to_string(scontext, &s, &slen) < 0)
578 if (context_struct_to_string(tcontext, &t, &tlen) < 0)
580 if (context_struct_to_string(newcontext, &n, &nlen) < 0)
582 audit_log(current->audit_context,
583 "security_compute_sid: invalid context %s"
587 n, s, t, policydb.p_class_val_to_name[tclass-1]);
592 if (!selinux_enforcing)
597 static int security_compute_sid(u32 ssid,
603 struct context *scontext = NULL, *tcontext = NULL, newcontext;
604 struct role_trans *roletr = NULL;
605 struct avtab_key avkey;
606 struct avtab_datum *avdatum;
607 struct avtab_node *node;
608 unsigned int type_change = 0;
611 if (!ss_initialized) {
613 case SECCLASS_PROCESS:
625 scontext = sidtab_search(&sidtab, ssid);
627 printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n",
632 tcontext = sidtab_search(&sidtab, tsid);
634 printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n",
640 context_init(&newcontext);
642 /* Set the user identity. */
644 case AVTAB_TRANSITION:
646 /* Use the process user identity. */
647 newcontext.user = scontext->user;
650 /* Use the related object owner. */
651 newcontext.user = tcontext->user;
655 /* Set the role and type to default values. */
657 case SECCLASS_PROCESS:
658 /* Use the current role and type of process. */
659 newcontext.role = scontext->role;
660 newcontext.type = scontext->type;
663 /* Use the well-defined object role. */
664 newcontext.role = OBJECT_R_VAL;
665 /* Use the type of the related object. */
666 newcontext.type = tcontext->type;
669 /* Look for a type transition/member/change rule. */
670 avkey.source_type = scontext->type;
671 avkey.target_type = tcontext->type;
672 avkey.target_class = tclass;
673 avdatum = avtab_search(&policydb.te_avtab, &avkey, AVTAB_TYPE);
675 /* If no permanent rule, also check for enabled conditional rules */
677 node = avtab_search_node(&policydb.te_cond_avtab, &avkey, specified);
678 for (; node != NULL; node = avtab_search_node_next(node, specified)) {
679 if (node->datum.specified & AVTAB_ENABLED) {
680 avdatum = &node->datum;
686 type_change = (avdatum && (avdatum->specified & specified));
688 /* Use the type from the type transition/member/change rule. */
690 case AVTAB_TRANSITION:
691 newcontext.type = avtab_transition(avdatum);
694 newcontext.type = avtab_member(avdatum);
697 newcontext.type = avtab_change(avdatum);
702 /* Check for class-specific changes. */
704 case SECCLASS_PROCESS:
705 if (specified & AVTAB_TRANSITION) {
706 /* Look for a role transition rule. */
707 for (roletr = policydb.role_tr; roletr;
708 roletr = roletr->next) {
709 if (roletr->role == scontext->role &&
710 roletr->type == tcontext->type) {
711 /* Use the role transition rule. */
712 newcontext.role = roletr->new_role;
718 if (!type_change && !roletr) {
719 /* No change in process role or type. */
727 (newcontext.user == tcontext->user) &&
728 mls_context_cmp(scontext, tcontext)) {
729 /* No change in object type, owner,
730 or MLS attributes. */
737 /* Set the MLS attributes.
738 This is done last because it may allocate memory. */
739 rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext);
743 /* Check the validity of the context. */
744 if (!policydb_context_isvalid(&policydb, &newcontext)) {
745 rc = compute_sid_handle_invalid_context(scontext,
752 /* Obtain the sid for the context. */
753 rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid);
756 context_destroy(&newcontext);
762 * security_transition_sid - Compute the SID for a new subject/object.
763 * @ssid: source security identifier
764 * @tsid: target security identifier
765 * @tclass: target security class
766 * @out_sid: security identifier for new subject/object
768 * Compute a SID to use for labeling a new subject or object in the
769 * class @tclass based on a SID pair (@ssid, @tsid).
770 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
771 * if insufficient memory is available, or %0 if the new SID was
772 * computed successfully.
774 int security_transition_sid(u32 ssid,
779 return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid);
783 * security_member_sid - Compute the SID for member selection.
784 * @ssid: source security identifier
785 * @tsid: target security identifier
786 * @tclass: target security class
787 * @out_sid: security identifier for selected member
789 * Compute a SID to use when selecting a member of a polyinstantiated
790 * object of class @tclass based on a SID pair (@ssid, @tsid).
791 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
792 * if insufficient memory is available, or %0 if the SID was
793 * computed successfully.
795 int security_member_sid(u32 ssid,
800 return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid);
804 * security_change_sid - Compute the SID for object relabeling.
805 * @ssid: source security identifier
806 * @tsid: target security identifier
807 * @tclass: target security class
808 * @out_sid: security identifier for selected member
810 * Compute a SID to use for relabeling an object of class @tclass
811 * based on a SID pair (@ssid, @tsid).
812 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
813 * if insufficient memory is available, or %0 if the SID was
814 * computed successfully.
816 int security_change_sid(u32 ssid,
821 return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid);
825 * Verify that each permission that is defined under the
826 * existing policy is still defined with the same value
829 static int validate_perm(void *key, void *datum, void *p)
832 struct perm_datum *perdatum, *perdatum2;
839 perdatum2 = hashtab_search(h, key);
841 printk(KERN_ERR "security: permission %s disappeared",
846 if (perdatum->value != perdatum2->value) {
847 printk(KERN_ERR "security: the value of permission %s changed",
856 * Verify that each class that is defined under the
857 * existing policy is still defined with the same
858 * attributes in the new policy.
860 static int validate_class(void *key, void *datum, void *p)
862 struct policydb *newp;
863 struct class_datum *cladatum, *cladatum2;
869 cladatum2 = hashtab_search(newp->p_classes.table, key);
871 printk(KERN_ERR "security: class %s disappeared\n",
876 if (cladatum->value != cladatum2->value) {
877 printk(KERN_ERR "security: the value of class %s changed\n",
882 if ((cladatum->comdatum && !cladatum2->comdatum) ||
883 (!cladatum->comdatum && cladatum2->comdatum)) {
884 printk(KERN_ERR "security: the inherits clause for the access "
885 "vector definition for class %s changed\n", (char *)key);
889 if (cladatum->comdatum) {
890 rc = hashtab_map(cladatum->comdatum->permissions.table, validate_perm,
891 cladatum2->comdatum->permissions.table);
893 printk(" in the access vector definition for class "
894 "%s\n", (char *)key);
898 rc = hashtab_map(cladatum->permissions.table, validate_perm,
899 cladatum2->permissions.table);
901 printk(" in access vector definition for class %s\n",
907 /* Clone the SID into the new SID table. */
908 static int clone_sid(u32 sid,
909 struct context *context,
912 struct sidtab *s = arg;
914 return sidtab_insert(s, sid, context);
917 static inline int convert_context_handle_invalid_context(struct context *context)
921 if (selinux_enforcing) {
927 context_struct_to_string(context, &s, &len);
928 printk(KERN_ERR "security: context %s is invalid\n", s);
934 struct convert_context_args {
935 struct policydb *oldp;
936 struct policydb *newp;
940 * Convert the values in the security context
941 * structure `c' from the values specified
942 * in the policy `p->oldp' to the values specified
943 * in the policy `p->newp'. Verify that the
944 * context is valid under the new policy.
946 static int convert_context(u32 key,
950 struct convert_context_args *args;
952 struct role_datum *role;
953 struct type_datum *typdatum;
954 struct user_datum *usrdatum;
961 rc = context_cpy(&oldc, c);
967 /* Convert the user. */
968 usrdatum = hashtab_search(args->newp->p_users.table,
969 args->oldp->p_user_val_to_name[c->user - 1]);
973 c->user = usrdatum->value;
975 /* Convert the role. */
976 role = hashtab_search(args->newp->p_roles.table,
977 args->oldp->p_role_val_to_name[c->role - 1]);
981 c->role = role->value;
983 /* Convert the type. */
984 typdatum = hashtab_search(args->newp->p_types.table,
985 args->oldp->p_type_val_to_name[c->type - 1]);
989 c->type = typdatum->value;
991 rc = mls_convert_context(args->oldp, args->newp, c);
995 /* Check the validity of the new context. */
996 if (!policydb_context_isvalid(args->newp, c)) {
997 rc = convert_context_handle_invalid_context(&oldc);
1002 context_destroy(&oldc);
1006 context_struct_to_string(&oldc, &s, &len);
1007 context_destroy(&oldc);
1008 printk(KERN_ERR "security: invalidating context %s\n", s);
1013 extern void selinux_complete_init(void);
1016 * security_load_policy - Load a security policy configuration.
1017 * @data: binary policy data
1018 * @len: length of data in bytes
1020 * Load a new set of security policy configuration data,
1021 * validate it and convert the SID table as necessary.
1022 * This function will flush the access vector cache after
1023 * loading the new policy.
1025 int security_load_policy(void *data, size_t len)
1027 struct policydb oldpolicydb, newpolicydb;
1028 struct sidtab oldsidtab, newsidtab;
1029 struct convert_context_args args;
1032 struct policy_file file = { data, len }, *fp = &file;
1036 if (!ss_initialized) {
1038 if (policydb_read(&policydb, fp)) {
1040 avtab_cache_destroy();
1043 if (policydb_load_isids(&policydb, &sidtab)) {
1045 policydb_destroy(&policydb);
1046 avtab_cache_destroy();
1052 selinux_complete_init();
1057 sidtab_hash_eval(&sidtab, "sids");
1060 if (policydb_read(&newpolicydb, fp)) {
1065 sidtab_init(&newsidtab);
1067 /* Verify that the existing classes did not change. */
1068 if (hashtab_map(policydb.p_classes.table, validate_class, &newpolicydb)) {
1069 printk(KERN_ERR "security: the definition of an existing "
1075 /* Clone the SID table. */
1076 sidtab_shutdown(&sidtab);
1077 if (sidtab_map(&sidtab, clone_sid, &newsidtab)) {
1082 /* Convert the internal representations of contexts
1083 in the new SID table and remove invalid SIDs. */
1084 args.oldp = &policydb;
1085 args.newp = &newpolicydb;
1086 sidtab_map_remove_on_error(&newsidtab, convert_context, &args);
1088 /* Save the old policydb and SID table to free later. */
1089 memcpy(&oldpolicydb, &policydb, sizeof policydb);
1090 sidtab_set(&oldsidtab, &sidtab);
1092 /* Install the new policydb and SID table. */
1094 memcpy(&policydb, &newpolicydb, sizeof policydb);
1095 sidtab_set(&sidtab, &newsidtab);
1096 seqno = ++latest_granting;
1101 /* Free the old policydb and SID table. */
1102 policydb_destroy(&oldpolicydb);
1103 sidtab_destroy(&oldsidtab);
1105 avc_ss_reset(seqno);
1106 selnl_notify_policyload(seqno);
1112 sidtab_destroy(&newsidtab);
1113 policydb_destroy(&newpolicydb);
1119 * security_port_sid - Obtain the SID for a port.
1120 * @domain: communication domain aka address family
1121 * @type: socket type
1122 * @protocol: protocol number
1123 * @port: port number
1124 * @out_sid: security identifier
1126 int security_port_sid(u16 domain,
1137 c = policydb.ocontexts[OCON_PORT];
1139 if (c->u.port.protocol == protocol &&
1140 c->u.port.low_port <= port &&
1141 c->u.port.high_port >= port)
1148 rc = sidtab_context_to_sid(&sidtab,
1154 *out_sid = c->sid[0];
1156 *out_sid = SECINITSID_PORT;
1165 * security_netif_sid - Obtain the SID for a network interface.
1166 * @name: interface name
1167 * @if_sid: interface SID
1168 * @msg_sid: default SID for received packets
1170 int security_netif_sid(char *name,
1179 c = policydb.ocontexts[OCON_NETIF];
1181 if (strcmp(name, c->u.name) == 0)
1187 if (!c->sid[0] || !c->sid[1]) {
1188 rc = sidtab_context_to_sid(&sidtab,
1193 rc = sidtab_context_to_sid(&sidtab,
1199 *if_sid = c->sid[0];
1200 *msg_sid = c->sid[1];
1202 *if_sid = SECINITSID_NETIF;
1203 *msg_sid = SECINITSID_NETMSG;
1211 static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask)
1215 for(i = 0; i < 4; i++)
1216 if(addr[i] != (input[i] & mask[i])) {
1225 * security_node_sid - Obtain the SID for a node (host).
1226 * @domain: communication domain aka address family
1228 * @addrlen: address length in bytes
1229 * @out_sid: security identifier
1231 int security_node_sid(u16 domain,
1245 if (addrlen != sizeof(u32)) {
1250 addr = *((u32 *)addrp);
1252 c = policydb.ocontexts[OCON_NODE];
1254 if (c->u.node.addr == (addr & c->u.node.mask))
1262 if (addrlen != sizeof(u64) * 2) {
1266 c = policydb.ocontexts[OCON_NODE6];
1268 if (match_ipv6_addrmask(addrp, c->u.node6.addr,
1276 *out_sid = SECINITSID_NODE;
1282 rc = sidtab_context_to_sid(&sidtab,
1288 *out_sid = c->sid[0];
1290 *out_sid = SECINITSID_NODE;
1301 * security_get_user_sids - Obtain reachable SIDs for a user.
1302 * @fromsid: starting SID
1303 * @username: username
1304 * @sids: array of reachable SIDs for user
1305 * @nel: number of elements in @sids
1307 * Generate the set of SIDs for legal security contexts
1308 * for a given user that can be reached by @fromsid.
1309 * Set *@sids to point to a dynamically allocated
1310 * array containing the set of SIDs. Set *@nel to the
1311 * number of elements in the array.
1314 int security_get_user_sids(u32 fromsid,
1319 struct context *fromcon, usercon;
1320 u32 *mysids, *mysids2, sid;
1321 u32 mynel = 0, maxnel = SIDS_NEL;
1322 struct user_datum *user;
1323 struct role_datum *role;
1324 struct av_decision avd;
1327 if (!ss_initialized) {
1335 fromcon = sidtab_search(&sidtab, fromsid);
1341 user = hashtab_search(policydb.p_users.table, username);
1346 usercon.user = user->value;
1348 mysids = kmalloc(maxnel*sizeof(*mysids), GFP_ATOMIC);
1353 memset(mysids, 0, maxnel*sizeof(*mysids));
1355 for (i = ebitmap_startbit(&user->roles); i < ebitmap_length(&user->roles); i++) {
1356 if (!ebitmap_get_bit(&user->roles, i))
1358 role = policydb.role_val_to_struct[i];
1360 for (j = ebitmap_startbit(&role->types); j < ebitmap_length(&role->types); j++) {
1361 if (!ebitmap_get_bit(&role->types, j))
1364 mls_for_user_ranges(user,usercon) {
1365 rc = context_struct_compute_av(fromcon, &usercon,
1367 PROCESS__TRANSITION,
1369 if (rc || !(avd.allowed & PROCESS__TRANSITION))
1371 rc = sidtab_context_to_sid(&sidtab, &usercon, &sid);
1376 if (mynel < maxnel) {
1377 mysids[mynel++] = sid;
1380 mysids2 = kmalloc(maxnel*sizeof(*mysids2), GFP_ATOMIC);
1386 memset(mysids2, 0, maxnel*sizeof(*mysids2));
1387 memcpy(mysids2, mysids, mynel * sizeof(*mysids2));
1390 mysids[mynel++] = sid;
1393 mls_end_user_ranges;
1407 * security_genfs_sid - Obtain a SID for a file in a filesystem
1408 * @fstype: filesystem type
1409 * @path: path from root of mount
1410 * @sclass: file security class
1411 * @sid: SID for path
1413 * Obtain a SID to use for a file in a filesystem that
1414 * cannot support xattr or use a fixed labeling behavior like
1415 * transition SIDs or task SIDs.
1417 int security_genfs_sid(const char *fstype,
1423 struct genfs *genfs;
1425 int rc = 0, cmp = 0;
1429 for (genfs = policydb.genfs; genfs; genfs = genfs->next) {
1430 cmp = strcmp(fstype, genfs->fstype);
1435 if (!genfs || cmp) {
1436 *sid = SECINITSID_UNLABELED;
1441 for (c = genfs->head; c; c = c->next) {
1442 len = strlen(c->u.name);
1443 if ((!c->v.sclass || sclass == c->v.sclass) &&
1444 (strncmp(c->u.name, path, len) == 0))
1449 *sid = SECINITSID_UNLABELED;
1455 rc = sidtab_context_to_sid(&sidtab,
1469 * security_fs_use - Determine how to handle labeling for a filesystem.
1470 * @fstype: filesystem type
1471 * @behavior: labeling behavior
1472 * @sid: SID for filesystem (superblock)
1474 int security_fs_use(
1476 unsigned int *behavior,
1484 c = policydb.ocontexts[OCON_FSUSE];
1486 if (strcmp(fstype, c->u.name) == 0)
1492 *behavior = c->v.behavior;
1494 rc = sidtab_context_to_sid(&sidtab,
1502 rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid);
1504 *behavior = SECURITY_FS_USE_NONE;
1507 *behavior = SECURITY_FS_USE_GENFS;
1516 int security_get_bools(int *len, char ***names, int **values)
1518 int i, rc = -ENOMEM;
1524 *len = policydb.p_bools.nprim;
1530 *names = (char**)kmalloc(sizeof(char*) * *len, GFP_ATOMIC);
1533 memset(*names, 0, sizeof(char*) * *len);
1535 *values = (int*)kmalloc(sizeof(int) * *len, GFP_ATOMIC);
1539 for (i = 0; i < *len; i++) {
1541 (*values)[i] = policydb.bool_val_to_struct[i]->state;
1542 name_len = strlen(policydb.p_bool_val_to_name[i]) + 1;
1543 (*names)[i] = (char*)kmalloc(sizeof(char) * name_len, GFP_ATOMIC);
1546 strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len);
1547 (*names)[i][name_len - 1] = 0;
1555 for (i = 0; i < *len; i++)
1565 int security_set_bools(int len, int *values)
1568 int lenp, seqno = 0;
1569 struct cond_node *cur;
1573 lenp = policydb.p_bools.nprim;
1579 printk(KERN_INFO "security: committed booleans { ");
1580 for (i = 0; i < len; i++) {
1582 policydb.bool_val_to_struct[i]->state = 1;
1584 policydb.bool_val_to_struct[i]->state = 0;
1588 printk("%s:%d", policydb.p_bool_val_to_name[i],
1589 policydb.bool_val_to_struct[i]->state);
1593 for (cur = policydb.cond_list; cur != NULL; cur = cur->next) {
1594 rc = evaluate_cond_node(&policydb, cur);
1599 seqno = ++latest_granting;
1604 avc_ss_reset(seqno);
1605 selnl_notify_policyload(seqno);
1610 int security_get_bool_value(int bool)
1617 len = policydb.p_bools.nprim;
1623 rc = policydb.bool_val_to_struct[bool]->state;