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.
10 * Support for context based audit filters.
12 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
14 * Added conditional policy language extensions
16 * Updated: Hewlett-Packard <paul.moore@hp.com>
18 * Added support for NetLabel
19 * Added support for the policy capability bitmap
21 * Updated: Chad Sellers <csellers@tresys.com>
23 * Added validation of kernel classes and permissions
25 * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P.
26 * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
27 * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC
28 * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
29 * This program is free software; you can redistribute it and/or modify
30 * it under the terms of the GNU General Public License as published by
31 * the Free Software Foundation, version 2.
33 #include <linux/kernel.h>
34 #include <linux/slab.h>
35 #include <linux/string.h>
36 #include <linux/spinlock.h>
37 #include <linux/rcupdate.h>
38 #include <linux/errno.h>
40 #include <linux/sched.h>
41 #include <linux/audit.h>
42 #include <linux/mutex.h>
43 #include <net/netlabel.h>
53 #include "conditional.h"
60 extern void selnl_notify_policyload(u32 seqno);
61 unsigned int policydb_loaded_version;
63 int selinux_policycap_netpeer;
64 int selinux_policycap_openperm;
67 * This is declared in avc.c
69 extern const struct selinux_class_perm selinux_class_perm;
71 static DEFINE_RWLOCK(policy_rwlock);
72 #define POLICY_RDLOCK read_lock(&policy_rwlock)
73 #define POLICY_WRLOCK write_lock_irq(&policy_rwlock)
74 #define POLICY_RDUNLOCK read_unlock(&policy_rwlock)
75 #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock)
77 static DEFINE_MUTEX(load_mutex);
78 #define LOAD_LOCK mutex_lock(&load_mutex)
79 #define LOAD_UNLOCK mutex_unlock(&load_mutex)
81 static struct sidtab sidtab;
82 struct policydb policydb;
83 int ss_initialized = 0;
86 * The largest sequence number that has been used when
87 * providing an access decision to the access vector cache.
88 * The sequence number only changes when a policy change
91 static u32 latest_granting = 0;
93 /* Forward declaration. */
94 static int context_struct_to_string(struct context *context, char **scontext,
98 * Return the boolean value of a constraint expression
99 * when it is applied to the specified source and target
102 * xcontext is a special beast... It is used by the validatetrans rules
103 * only. For these rules, scontext is the context before the transition,
104 * tcontext is the context after the transition, and xcontext is the context
105 * of the process performing the transition. All other callers of
106 * constraint_expr_eval should pass in NULL for xcontext.
108 static int constraint_expr_eval(struct context *scontext,
109 struct context *tcontext,
110 struct context *xcontext,
111 struct constraint_expr *cexpr)
115 struct role_datum *r1, *r2;
116 struct mls_level *l1, *l2;
117 struct constraint_expr *e;
118 int s[CEXPR_MAXDEPTH];
121 for (e = cexpr; e; e = e->next) {
122 switch (e->expr_type) {
138 if (sp == (CEXPR_MAXDEPTH-1))
142 val1 = scontext->user;
143 val2 = tcontext->user;
146 val1 = scontext->type;
147 val2 = tcontext->type;
150 val1 = scontext->role;
151 val2 = tcontext->role;
152 r1 = policydb.role_val_to_struct[val1 - 1];
153 r2 = policydb.role_val_to_struct[val2 - 1];
156 s[++sp] = ebitmap_get_bit(&r1->dominates,
160 s[++sp] = ebitmap_get_bit(&r2->dominates,
164 s[++sp] = ( !ebitmap_get_bit(&r1->dominates,
166 !ebitmap_get_bit(&r2->dominates,
174 l1 = &(scontext->range.level[0]);
175 l2 = &(tcontext->range.level[0]);
178 l1 = &(scontext->range.level[0]);
179 l2 = &(tcontext->range.level[1]);
182 l1 = &(scontext->range.level[1]);
183 l2 = &(tcontext->range.level[0]);
186 l1 = &(scontext->range.level[1]);
187 l2 = &(tcontext->range.level[1]);
190 l1 = &(scontext->range.level[0]);
191 l2 = &(scontext->range.level[1]);
194 l1 = &(tcontext->range.level[0]);
195 l2 = &(tcontext->range.level[1]);
200 s[++sp] = mls_level_eq(l1, l2);
203 s[++sp] = !mls_level_eq(l1, l2);
206 s[++sp] = mls_level_dom(l1, l2);
209 s[++sp] = mls_level_dom(l2, l1);
212 s[++sp] = mls_level_incomp(l2, l1);
226 s[++sp] = (val1 == val2);
229 s[++sp] = (val1 != val2);
237 if (sp == (CEXPR_MAXDEPTH-1))
240 if (e->attr & CEXPR_TARGET)
242 else if (e->attr & CEXPR_XTARGET) {
249 if (e->attr & CEXPR_USER)
251 else if (e->attr & CEXPR_ROLE)
253 else if (e->attr & CEXPR_TYPE)
262 s[++sp] = ebitmap_get_bit(&e->names, val1 - 1);
265 s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1);
283 * Compute access vectors based on a context structure pair for
284 * the permissions in a particular class.
286 static int context_struct_compute_av(struct context *scontext,
287 struct context *tcontext,
290 struct av_decision *avd)
292 struct constraint_node *constraint;
293 struct role_allow *ra;
294 struct avtab_key avkey;
295 struct avtab_node *node;
296 struct class_datum *tclass_datum;
297 struct ebitmap *sattr, *tattr;
298 struct ebitmap_node *snode, *tnode;
299 const struct selinux_class_perm *kdefs = &selinux_class_perm;
303 * Remap extended Netlink classes for old policy versions.
304 * Do this here rather than socket_type_to_security_class()
305 * in case a newer policy version is loaded, allowing sockets
306 * to remain in the correct class.
308 if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS)
309 if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET &&
310 tclass <= SECCLASS_NETLINK_DNRT_SOCKET)
311 tclass = SECCLASS_NETLINK_SOCKET;
314 * Initialize the access vectors to the default values.
317 avd->decided = 0xffffffff;
319 avd->auditdeny = 0xffffffff;
320 avd->seqno = latest_granting;
323 * Check for all the invalid cases.
325 * - tclass > policy and > kernel
326 * - tclass > policy but is a userspace class
327 * - tclass > policy but we do not allow unknowns
329 if (unlikely(!tclass))
331 if (unlikely(tclass > policydb.p_classes.nprim))
332 if (tclass > kdefs->cts_len ||
333 !kdefs->class_to_string[tclass - 1] ||
334 !policydb.allow_unknown)
338 * Kernel class and we allow unknown so pad the allow decision
339 * the pad will be all 1 for unknown classes.
341 if (tclass <= kdefs->cts_len && policydb.allow_unknown)
342 avd->allowed = policydb.undefined_perms[tclass - 1];
345 * Not in policy. Since decision is completed (all 1 or all 0) return.
347 if (unlikely(tclass > policydb.p_classes.nprim))
350 tclass_datum = policydb.class_val_to_struct[tclass - 1];
353 * If a specific type enforcement rule was defined for
354 * this permission check, then use it.
356 avkey.target_class = tclass;
357 avkey.specified = AVTAB_AV;
358 sattr = &policydb.type_attr_map[scontext->type - 1];
359 tattr = &policydb.type_attr_map[tcontext->type - 1];
360 ebitmap_for_each_positive_bit(sattr, snode, i) {
361 ebitmap_for_each_positive_bit(tattr, tnode, j) {
362 avkey.source_type = i + 1;
363 avkey.target_type = j + 1;
364 for (node = avtab_search_node(&policydb.te_avtab, &avkey);
366 node = avtab_search_node_next(node, avkey.specified)) {
367 if (node->key.specified == AVTAB_ALLOWED)
368 avd->allowed |= node->datum.data;
369 else if (node->key.specified == AVTAB_AUDITALLOW)
370 avd->auditallow |= node->datum.data;
371 else if (node->key.specified == AVTAB_AUDITDENY)
372 avd->auditdeny &= node->datum.data;
375 /* Check conditional av table for additional permissions */
376 cond_compute_av(&policydb.te_cond_avtab, &avkey, avd);
382 * Remove any permissions prohibited by a constraint (this includes
385 constraint = tclass_datum->constraints;
387 if ((constraint->permissions & (avd->allowed)) &&
388 !constraint_expr_eval(scontext, tcontext, NULL,
390 avd->allowed = (avd->allowed) & ~(constraint->permissions);
392 constraint = constraint->next;
396 * If checking process transition permission and the
397 * role is changing, then check the (current_role, new_role)
400 if (tclass == SECCLASS_PROCESS &&
401 (avd->allowed & (PROCESS__TRANSITION | PROCESS__DYNTRANSITION)) &&
402 scontext->role != tcontext->role) {
403 for (ra = policydb.role_allow; ra; ra = ra->next) {
404 if (scontext->role == ra->role &&
405 tcontext->role == ra->new_role)
409 avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION |
410 PROCESS__DYNTRANSITION);
416 printk(KERN_ERR "%s: unrecognized class %d\n", __func__, tclass);
420 static int security_validtrans_handle_fail(struct context *ocontext,
421 struct context *ncontext,
422 struct context *tcontext,
425 char *o = NULL, *n = NULL, *t = NULL;
426 u32 olen, nlen, tlen;
428 if (context_struct_to_string(ocontext, &o, &olen) < 0)
430 if (context_struct_to_string(ncontext, &n, &nlen) < 0)
432 if (context_struct_to_string(tcontext, &t, &tlen) < 0)
434 audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
435 "security_validate_transition: denied for"
436 " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s",
437 o, n, t, policydb.p_class_val_to_name[tclass-1]);
443 if (!selinux_enforcing)
448 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
451 struct context *ocontext;
452 struct context *ncontext;
453 struct context *tcontext;
454 struct class_datum *tclass_datum;
455 struct constraint_node *constraint;
464 * Remap extended Netlink classes for old policy versions.
465 * Do this here rather than socket_type_to_security_class()
466 * in case a newer policy version is loaded, allowing sockets
467 * to remain in the correct class.
469 if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS)
470 if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET &&
471 tclass <= SECCLASS_NETLINK_DNRT_SOCKET)
472 tclass = SECCLASS_NETLINK_SOCKET;
474 if (!tclass || tclass > policydb.p_classes.nprim) {
475 printk(KERN_ERR "security_validate_transition: "
476 "unrecognized class %d\n", tclass);
480 tclass_datum = policydb.class_val_to_struct[tclass - 1];
482 ocontext = sidtab_search(&sidtab, oldsid);
484 printk(KERN_ERR "security_validate_transition: "
485 " unrecognized SID %d\n", oldsid);
490 ncontext = sidtab_search(&sidtab, newsid);
492 printk(KERN_ERR "security_validate_transition: "
493 " unrecognized SID %d\n", newsid);
498 tcontext = sidtab_search(&sidtab, tasksid);
500 printk(KERN_ERR "security_validate_transition: "
501 " unrecognized SID %d\n", tasksid);
506 constraint = tclass_datum->validatetrans;
508 if (!constraint_expr_eval(ocontext, ncontext, tcontext,
510 rc = security_validtrans_handle_fail(ocontext, ncontext,
514 constraint = constraint->next;
523 * security_compute_av - Compute access vector decisions.
524 * @ssid: source security identifier
525 * @tsid: target security identifier
526 * @tclass: target security class
527 * @requested: requested permissions
528 * @avd: access vector decisions
530 * Compute a set of access vector decisions based on the
531 * SID pair (@ssid, @tsid) for the permissions in @tclass.
532 * Return -%EINVAL if any of the parameters are invalid or %0
533 * if the access vector decisions were computed successfully.
535 int security_compute_av(u32 ssid,
539 struct av_decision *avd)
541 struct context *scontext = NULL, *tcontext = NULL;
544 if (!ss_initialized) {
545 avd->allowed = 0xffffffff;
546 avd->decided = 0xffffffff;
548 avd->auditdeny = 0xffffffff;
549 avd->seqno = latest_granting;
555 scontext = sidtab_search(&sidtab, ssid);
557 printk(KERN_ERR "security_compute_av: unrecognized SID %d\n",
562 tcontext = sidtab_search(&sidtab, tsid);
564 printk(KERN_ERR "security_compute_av: unrecognized SID %d\n",
570 rc = context_struct_compute_av(scontext, tcontext, tclass,
578 * Write the security context string representation of
579 * the context structure `context' into a dynamically
580 * allocated string of the correct size. Set `*scontext'
581 * to point to this string and set `*scontext_len' to
582 * the length of the string.
584 static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len)
591 /* Compute the size of the context. */
592 *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1;
593 *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1;
594 *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1;
595 *scontext_len += mls_compute_context_len(context);
597 /* Allocate space for the context; caller must free this space. */
598 scontextp = kmalloc(*scontext_len, GFP_ATOMIC);
602 *scontext = scontextp;
605 * Copy the user name, role name and type name into the context.
607 sprintf(scontextp, "%s:%s:%s",
608 policydb.p_user_val_to_name[context->user - 1],
609 policydb.p_role_val_to_name[context->role - 1],
610 policydb.p_type_val_to_name[context->type - 1]);
611 scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) +
612 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) +
613 1 + strlen(policydb.p_type_val_to_name[context->type - 1]);
615 mls_sid_to_context(context, &scontextp);
622 #include "initial_sid_to_string.h"
624 const char *security_get_initial_sid_context(u32 sid)
626 if (unlikely(sid > SECINITSID_NUM))
628 return initial_sid_to_string[sid];
632 * security_sid_to_context - Obtain a context for a given SID.
633 * @sid: security identifier, SID
634 * @scontext: security context
635 * @scontext_len: length in bytes
637 * Write the string representation of the context associated with @sid
638 * into a dynamically allocated string of the correct size. Set @scontext
639 * to point to this string and set @scontext_len to the length of the string.
641 int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len)
643 struct context *context;
649 if (!ss_initialized) {
650 if (sid <= SECINITSID_NUM) {
653 *scontext_len = strlen(initial_sid_to_string[sid]) + 1;
654 scontextp = kmalloc(*scontext_len,GFP_ATOMIC);
659 strcpy(scontextp, initial_sid_to_string[sid]);
660 *scontext = scontextp;
663 printk(KERN_ERR "security_sid_to_context: called before initial "
664 "load_policy on unknown SID %d\n", sid);
669 context = sidtab_search(&sidtab, sid);
671 printk(KERN_ERR "security_sid_to_context: unrecognized SID "
676 rc = context_struct_to_string(context, scontext, scontext_len);
684 static int security_context_to_sid_core(char *scontext, u32 scontext_len,
685 u32 *sid, u32 def_sid, gfp_t gfp_flags)
688 struct context context;
689 struct role_datum *role;
690 struct type_datum *typdatum;
691 struct user_datum *usrdatum;
692 char *scontextp, *p, oldc;
695 if (!ss_initialized) {
698 for (i = 1; i < SECINITSID_NUM; i++) {
699 if (!strcmp(initial_sid_to_string[i], scontext)) {
704 *sid = SECINITSID_KERNEL;
709 /* Copy the string so that we can modify the copy as we parse it.
710 The string should already by null terminated, but we append a
711 null suffix to the copy to avoid problems with the existing
712 attr package, which doesn't view the null terminator as part
713 of the attribute value. */
714 scontext2 = kmalloc(scontext_len+1, gfp_flags);
719 memcpy(scontext2, scontext, scontext_len);
720 scontext2[scontext_len] = 0;
722 context_init(&context);
727 /* Parse the security context. */
730 scontextp = (char *) scontext2;
732 /* Extract the user. */
734 while (*p && *p != ':')
742 usrdatum = hashtab_search(policydb.p_users.table, scontextp);
746 context.user = usrdatum->value;
750 while (*p && *p != ':')
758 role = hashtab_search(policydb.p_roles.table, scontextp);
761 context.role = role->value;
765 while (*p && *p != ':')
770 typdatum = hashtab_search(policydb.p_types.table, scontextp);
774 context.type = typdatum->value;
776 rc = mls_context_to_sid(oldc, &p, &context, &sidtab, def_sid);
780 if ((p - scontext2) < scontext_len) {
785 /* Check the validity of the new context. */
786 if (!policydb_context_isvalid(&policydb, &context)) {
790 /* Obtain the new sid. */
791 rc = sidtab_context_to_sid(&sidtab, &context, sid);
794 context_destroy(&context);
801 * security_context_to_sid - Obtain a SID for a given security context.
802 * @scontext: security context
803 * @scontext_len: length in bytes
804 * @sid: security identifier, SID
806 * Obtains a SID associated with the security context that
807 * has the string representation specified by @scontext.
808 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
809 * memory is available, or 0 on success.
811 int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid)
813 return security_context_to_sid_core(scontext, scontext_len,
814 sid, SECSID_NULL, GFP_KERNEL);
818 * security_context_to_sid_default - Obtain a SID for a given security context,
819 * falling back to specified default if needed.
821 * @scontext: security context
822 * @scontext_len: length in bytes
823 * @sid: security identifier, SID
824 * @def_sid: default SID to assign on error
826 * Obtains a SID associated with the security context that
827 * has the string representation specified by @scontext.
828 * The default SID is passed to the MLS layer to be used to allow
829 * kernel labeling of the MLS field if the MLS field is not present
830 * (for upgrading to MLS without full relabel).
831 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
832 * memory is available, or 0 on success.
834 int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *sid,
835 u32 def_sid, gfp_t gfp_flags)
837 return security_context_to_sid_core(scontext, scontext_len,
838 sid, def_sid, gfp_flags);
841 static int compute_sid_handle_invalid_context(
842 struct context *scontext,
843 struct context *tcontext,
845 struct context *newcontext)
847 char *s = NULL, *t = NULL, *n = NULL;
848 u32 slen, tlen, nlen;
850 if (context_struct_to_string(scontext, &s, &slen) < 0)
852 if (context_struct_to_string(tcontext, &t, &tlen) < 0)
854 if (context_struct_to_string(newcontext, &n, &nlen) < 0)
856 audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
857 "security_compute_sid: invalid context %s"
861 n, s, t, policydb.p_class_val_to_name[tclass-1]);
866 if (!selinux_enforcing)
871 static int security_compute_sid(u32 ssid,
877 struct context *scontext = NULL, *tcontext = NULL, newcontext;
878 struct role_trans *roletr = NULL;
879 struct avtab_key avkey;
880 struct avtab_datum *avdatum;
881 struct avtab_node *node;
884 if (!ss_initialized) {
886 case SECCLASS_PROCESS:
896 context_init(&newcontext);
900 scontext = sidtab_search(&sidtab, ssid);
902 printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n",
907 tcontext = sidtab_search(&sidtab, tsid);
909 printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n",
915 /* Set the user identity. */
917 case AVTAB_TRANSITION:
919 /* Use the process user identity. */
920 newcontext.user = scontext->user;
923 /* Use the related object owner. */
924 newcontext.user = tcontext->user;
928 /* Set the role and type to default values. */
930 case SECCLASS_PROCESS:
931 /* Use the current role and type of process. */
932 newcontext.role = scontext->role;
933 newcontext.type = scontext->type;
936 /* Use the well-defined object role. */
937 newcontext.role = OBJECT_R_VAL;
938 /* Use the type of the related object. */
939 newcontext.type = tcontext->type;
942 /* Look for a type transition/member/change rule. */
943 avkey.source_type = scontext->type;
944 avkey.target_type = tcontext->type;
945 avkey.target_class = tclass;
946 avkey.specified = specified;
947 avdatum = avtab_search(&policydb.te_avtab, &avkey);
949 /* If no permanent rule, also check for enabled conditional rules */
951 node = avtab_search_node(&policydb.te_cond_avtab, &avkey);
952 for (; node != NULL; node = avtab_search_node_next(node, specified)) {
953 if (node->key.specified & AVTAB_ENABLED) {
954 avdatum = &node->datum;
961 /* Use the type from the type transition/member/change rule. */
962 newcontext.type = avdatum->data;
965 /* Check for class-specific changes. */
967 case SECCLASS_PROCESS:
968 if (specified & AVTAB_TRANSITION) {
969 /* Look for a role transition rule. */
970 for (roletr = policydb.role_tr; roletr;
971 roletr = roletr->next) {
972 if (roletr->role == scontext->role &&
973 roletr->type == tcontext->type) {
974 /* Use the role transition rule. */
975 newcontext.role = roletr->new_role;
985 /* Set the MLS attributes.
986 This is done last because it may allocate memory. */
987 rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext);
991 /* Check the validity of the context. */
992 if (!policydb_context_isvalid(&policydb, &newcontext)) {
993 rc = compute_sid_handle_invalid_context(scontext,
1000 /* Obtain the sid for the context. */
1001 rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid);
1004 context_destroy(&newcontext);
1010 * security_transition_sid - Compute the SID for a new subject/object.
1011 * @ssid: source security identifier
1012 * @tsid: target security identifier
1013 * @tclass: target security class
1014 * @out_sid: security identifier for new subject/object
1016 * Compute a SID to use for labeling a new subject or object in the
1017 * class @tclass based on a SID pair (@ssid, @tsid).
1018 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1019 * if insufficient memory is available, or %0 if the new SID was
1020 * computed successfully.
1022 int security_transition_sid(u32 ssid,
1027 return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid);
1031 * security_member_sid - Compute the SID for member selection.
1032 * @ssid: source security identifier
1033 * @tsid: target security identifier
1034 * @tclass: target security class
1035 * @out_sid: security identifier for selected member
1037 * Compute a SID to use when selecting a member of a polyinstantiated
1038 * object of class @tclass based on a SID pair (@ssid, @tsid).
1039 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1040 * if insufficient memory is available, or %0 if the SID was
1041 * computed successfully.
1043 int security_member_sid(u32 ssid,
1048 return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid);
1052 * security_change_sid - Compute the SID for object relabeling.
1053 * @ssid: source security identifier
1054 * @tsid: target security identifier
1055 * @tclass: target security class
1056 * @out_sid: security identifier for selected member
1058 * Compute a SID to use for relabeling an object of class @tclass
1059 * based on a SID pair (@ssid, @tsid).
1060 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1061 * if insufficient memory is available, or %0 if the SID was
1062 * computed successfully.
1064 int security_change_sid(u32 ssid,
1069 return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid);
1073 * Verify that each kernel class that is defined in the
1076 static int validate_classes(struct policydb *p)
1079 struct class_datum *cladatum;
1080 struct perm_datum *perdatum;
1081 u32 nprim, tmp, common_pts_len, perm_val, pol_val;
1083 const struct selinux_class_perm *kdefs = &selinux_class_perm;
1084 const char *def_class, *def_perm, *pol_class;
1085 struct symtab *perms;
1087 if (p->allow_unknown) {
1088 u32 num_classes = kdefs->cts_len;
1089 p->undefined_perms = kcalloc(num_classes, sizeof(u32), GFP_KERNEL);
1090 if (!p->undefined_perms)
1094 for (i = 1; i < kdefs->cts_len; i++) {
1095 def_class = kdefs->class_to_string[i];
1098 if (i > p->p_classes.nprim) {
1100 "SELinux: class %s not defined in policy\n",
1102 if (p->reject_unknown)
1104 if (p->allow_unknown)
1105 p->undefined_perms[i-1] = ~0U;
1108 pol_class = p->p_class_val_to_name[i-1];
1109 if (strcmp(pol_class, def_class)) {
1111 "SELinux: class %d is incorrect, found %s but should be %s\n",
1112 i, pol_class, def_class);
1116 for (i = 0; i < kdefs->av_pts_len; i++) {
1117 class_val = kdefs->av_perm_to_string[i].tclass;
1118 perm_val = kdefs->av_perm_to_string[i].value;
1119 def_perm = kdefs->av_perm_to_string[i].name;
1120 if (class_val > p->p_classes.nprim)
1122 pol_class = p->p_class_val_to_name[class_val-1];
1123 cladatum = hashtab_search(p->p_classes.table, pol_class);
1125 perms = &cladatum->permissions;
1126 nprim = 1 << (perms->nprim - 1);
1127 if (perm_val > nprim) {
1129 "SELinux: permission %s in class %s not defined in policy\n",
1130 def_perm, pol_class);
1131 if (p->reject_unknown)
1133 if (p->allow_unknown)
1134 p->undefined_perms[class_val-1] |= perm_val;
1137 perdatum = hashtab_search(perms->table, def_perm);
1138 if (perdatum == NULL) {
1140 "SELinux: permission %s in class %s not found in policy, bad policy\n",
1141 def_perm, pol_class);
1144 pol_val = 1 << (perdatum->value - 1);
1145 if (pol_val != perm_val) {
1147 "SELinux: permission %s in class %s has incorrect value\n",
1148 def_perm, pol_class);
1152 for (i = 0; i < kdefs->av_inherit_len; i++) {
1153 class_val = kdefs->av_inherit[i].tclass;
1154 if (class_val > p->p_classes.nprim)
1156 pol_class = p->p_class_val_to_name[class_val-1];
1157 cladatum = hashtab_search(p->p_classes.table, pol_class);
1159 if (!cladatum->comdatum) {
1161 "SELinux: class %s should have an inherits clause but does not\n",
1165 tmp = kdefs->av_inherit[i].common_base;
1167 while (!(tmp & 0x01)) {
1171 perms = &cladatum->comdatum->permissions;
1172 for (j = 0; j < common_pts_len; j++) {
1173 def_perm = kdefs->av_inherit[i].common_pts[j];
1174 if (j >= perms->nprim) {
1176 "SELinux: permission %s in class %s not defined in policy\n",
1177 def_perm, pol_class);
1178 if (p->reject_unknown)
1180 if (p->allow_unknown)
1181 p->undefined_perms[class_val-1] |= (1 << j);
1184 perdatum = hashtab_search(perms->table, def_perm);
1185 if (perdatum == NULL) {
1187 "SELinux: permission %s in class %s not found in policy, bad policy\n",
1188 def_perm, pol_class);
1191 if (perdatum->value != j + 1) {
1193 "SELinux: permission %s in class %s has incorrect value\n",
1194 def_perm, pol_class);
1202 /* Clone the SID into the new SID table. */
1203 static int clone_sid(u32 sid,
1204 struct context *context,
1207 struct sidtab *s = arg;
1209 return sidtab_insert(s, sid, context);
1212 static inline int convert_context_handle_invalid_context(struct context *context)
1216 if (selinux_enforcing) {
1222 context_struct_to_string(context, &s, &len);
1223 printk(KERN_ERR "SELinux: context %s is invalid\n", s);
1229 struct convert_context_args {
1230 struct policydb *oldp;
1231 struct policydb *newp;
1235 * Convert the values in the security context
1236 * structure `c' from the values specified
1237 * in the policy `p->oldp' to the values specified
1238 * in the policy `p->newp'. Verify that the
1239 * context is valid under the new policy.
1241 static int convert_context(u32 key,
1245 struct convert_context_args *args;
1246 struct context oldc;
1247 struct role_datum *role;
1248 struct type_datum *typdatum;
1249 struct user_datum *usrdatum;
1256 rc = context_cpy(&oldc, c);
1262 /* Convert the user. */
1263 usrdatum = hashtab_search(args->newp->p_users.table,
1264 args->oldp->p_user_val_to_name[c->user - 1]);
1268 c->user = usrdatum->value;
1270 /* Convert the role. */
1271 role = hashtab_search(args->newp->p_roles.table,
1272 args->oldp->p_role_val_to_name[c->role - 1]);
1276 c->role = role->value;
1278 /* Convert the type. */
1279 typdatum = hashtab_search(args->newp->p_types.table,
1280 args->oldp->p_type_val_to_name[c->type - 1]);
1284 c->type = typdatum->value;
1286 rc = mls_convert_context(args->oldp, args->newp, c);
1290 /* Check the validity of the new context. */
1291 if (!policydb_context_isvalid(args->newp, c)) {
1292 rc = convert_context_handle_invalid_context(&oldc);
1297 context_destroy(&oldc);
1301 context_struct_to_string(&oldc, &s, &len);
1302 context_destroy(&oldc);
1303 printk(KERN_ERR "SELinux: invalidating context %s\n", s);
1308 static void security_load_policycaps(void)
1310 selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps,
1311 POLICYDB_CAPABILITY_NETPEER);
1312 selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps,
1313 POLICYDB_CAPABILITY_OPENPERM);
1316 extern void selinux_complete_init(void);
1317 static int security_preserve_bools(struct policydb *p);
1320 * security_load_policy - Load a security policy configuration.
1321 * @data: binary policy data
1322 * @len: length of data in bytes
1324 * Load a new set of security policy configuration data,
1325 * validate it and convert the SID table as necessary.
1326 * This function will flush the access vector cache after
1327 * loading the new policy.
1329 int security_load_policy(void *data, size_t len)
1331 struct policydb oldpolicydb, newpolicydb;
1332 struct sidtab oldsidtab, newsidtab;
1333 struct convert_context_args args;
1336 struct policy_file file = { data, len }, *fp = &file;
1340 if (!ss_initialized) {
1342 if (policydb_read(&policydb, fp)) {
1344 avtab_cache_destroy();
1347 if (policydb_load_isids(&policydb, &sidtab)) {
1349 policydb_destroy(&policydb);
1350 avtab_cache_destroy();
1353 /* Verify that the kernel defined classes are correct. */
1354 if (validate_classes(&policydb)) {
1356 "SELinux: the definition of a class is incorrect\n");
1358 sidtab_destroy(&sidtab);
1359 policydb_destroy(&policydb);
1360 avtab_cache_destroy();
1363 security_load_policycaps();
1364 policydb_loaded_version = policydb.policyvers;
1366 seqno = ++latest_granting;
1368 selinux_complete_init();
1369 avc_ss_reset(seqno);
1370 selnl_notify_policyload(seqno);
1371 selinux_netlbl_cache_invalidate();
1372 selinux_xfrm_notify_policyload();
1377 sidtab_hash_eval(&sidtab, "sids");
1380 if (policydb_read(&newpolicydb, fp)) {
1385 sidtab_init(&newsidtab);
1387 /* Verify that the kernel defined classes are correct. */
1388 if (validate_classes(&newpolicydb)) {
1390 "SELinux: the definition of a class is incorrect\n");
1395 rc = security_preserve_bools(&newpolicydb);
1397 printk(KERN_ERR "SELinux: unable to preserve booleans\n");
1401 /* Clone the SID table. */
1402 sidtab_shutdown(&sidtab);
1403 if (sidtab_map(&sidtab, clone_sid, &newsidtab)) {
1408 /* Convert the internal representations of contexts
1409 in the new SID table and remove invalid SIDs. */
1410 args.oldp = &policydb;
1411 args.newp = &newpolicydb;
1412 sidtab_map_remove_on_error(&newsidtab, convert_context, &args);
1414 /* Save the old policydb and SID table to free later. */
1415 memcpy(&oldpolicydb, &policydb, sizeof policydb);
1416 sidtab_set(&oldsidtab, &sidtab);
1418 /* Install the new policydb and SID table. */
1420 memcpy(&policydb, &newpolicydb, sizeof policydb);
1421 sidtab_set(&sidtab, &newsidtab);
1422 security_load_policycaps();
1423 seqno = ++latest_granting;
1424 policydb_loaded_version = policydb.policyvers;
1428 /* Free the old policydb and SID table. */
1429 policydb_destroy(&oldpolicydb);
1430 sidtab_destroy(&oldsidtab);
1432 avc_ss_reset(seqno);
1433 selnl_notify_policyload(seqno);
1434 selinux_netlbl_cache_invalidate();
1435 selinux_xfrm_notify_policyload();
1441 sidtab_destroy(&newsidtab);
1442 policydb_destroy(&newpolicydb);
1448 * security_port_sid - Obtain the SID for a port.
1449 * @domain: communication domain aka address family
1450 * @type: socket type
1451 * @protocol: protocol number
1452 * @port: port number
1453 * @out_sid: security identifier
1455 int security_port_sid(u16 domain,
1466 c = policydb.ocontexts[OCON_PORT];
1468 if (c->u.port.protocol == protocol &&
1469 c->u.port.low_port <= port &&
1470 c->u.port.high_port >= port)
1477 rc = sidtab_context_to_sid(&sidtab,
1483 *out_sid = c->sid[0];
1485 *out_sid = SECINITSID_PORT;
1494 * security_netif_sid - Obtain the SID for a network interface.
1495 * @name: interface name
1496 * @if_sid: interface SID
1498 int security_netif_sid(char *name, u32 *if_sid)
1505 c = policydb.ocontexts[OCON_NETIF];
1507 if (strcmp(name, c->u.name) == 0)
1513 if (!c->sid[0] || !c->sid[1]) {
1514 rc = sidtab_context_to_sid(&sidtab,
1519 rc = sidtab_context_to_sid(&sidtab,
1525 *if_sid = c->sid[0];
1527 *if_sid = SECINITSID_NETIF;
1534 static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask)
1538 for(i = 0; i < 4; i++)
1539 if(addr[i] != (input[i] & mask[i])) {
1548 * security_node_sid - Obtain the SID for a node (host).
1549 * @domain: communication domain aka address family
1551 * @addrlen: address length in bytes
1552 * @out_sid: security identifier
1554 int security_node_sid(u16 domain,
1568 if (addrlen != sizeof(u32)) {
1573 addr = *((u32 *)addrp);
1575 c = policydb.ocontexts[OCON_NODE];
1577 if (c->u.node.addr == (addr & c->u.node.mask))
1585 if (addrlen != sizeof(u64) * 2) {
1589 c = policydb.ocontexts[OCON_NODE6];
1591 if (match_ipv6_addrmask(addrp, c->u.node6.addr,
1599 *out_sid = SECINITSID_NODE;
1605 rc = sidtab_context_to_sid(&sidtab,
1611 *out_sid = c->sid[0];
1613 *out_sid = SECINITSID_NODE;
1624 * security_get_user_sids - Obtain reachable SIDs for a user.
1625 * @fromsid: starting SID
1626 * @username: username
1627 * @sids: array of reachable SIDs for user
1628 * @nel: number of elements in @sids
1630 * Generate the set of SIDs for legal security contexts
1631 * for a given user that can be reached by @fromsid.
1632 * Set *@sids to point to a dynamically allocated
1633 * array containing the set of SIDs. Set *@nel to the
1634 * number of elements in the array.
1637 int security_get_user_sids(u32 fromsid,
1642 struct context *fromcon, usercon;
1643 u32 *mysids = NULL, *mysids2, sid;
1644 u32 mynel = 0, maxnel = SIDS_NEL;
1645 struct user_datum *user;
1646 struct role_datum *role;
1647 struct ebitmap_node *rnode, *tnode;
1653 if (!ss_initialized)
1658 fromcon = sidtab_search(&sidtab, fromsid);
1664 user = hashtab_search(policydb.p_users.table, username);
1669 usercon.user = user->value;
1671 mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC);
1677 ebitmap_for_each_positive_bit(&user->roles, rnode, i) {
1678 role = policydb.role_val_to_struct[i];
1680 ebitmap_for_each_positive_bit(&role->types, tnode, j) {
1683 if (mls_setup_user_range(fromcon, user, &usercon))
1686 rc = sidtab_context_to_sid(&sidtab, &usercon, &sid);
1689 if (mynel < maxnel) {
1690 mysids[mynel++] = sid;
1693 mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC);
1698 memcpy(mysids2, mysids, mynel * sizeof(*mysids2));
1701 mysids[mynel++] = sid;
1713 mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL);
1719 for (i = 0, j = 0; i < mynel; i++) {
1720 rc = avc_has_perm_noaudit(fromsid, mysids[i],
1722 PROCESS__TRANSITION, AVC_STRICT,
1725 mysids2[j++] = mysids[i];
1737 * security_genfs_sid - Obtain a SID for a file in a filesystem
1738 * @fstype: filesystem type
1739 * @path: path from root of mount
1740 * @sclass: file security class
1741 * @sid: SID for path
1743 * Obtain a SID to use for a file in a filesystem that
1744 * cannot support xattr or use a fixed labeling behavior like
1745 * transition SIDs or task SIDs.
1747 int security_genfs_sid(const char *fstype,
1753 struct genfs *genfs;
1755 int rc = 0, cmp = 0;
1757 while (path[0] == '/' && path[1] == '/')
1762 for (genfs = policydb.genfs; genfs; genfs = genfs->next) {
1763 cmp = strcmp(fstype, genfs->fstype);
1768 if (!genfs || cmp) {
1769 *sid = SECINITSID_UNLABELED;
1774 for (c = genfs->head; c; c = c->next) {
1775 len = strlen(c->u.name);
1776 if ((!c->v.sclass || sclass == c->v.sclass) &&
1777 (strncmp(c->u.name, path, len) == 0))
1782 *sid = SECINITSID_UNLABELED;
1788 rc = sidtab_context_to_sid(&sidtab,
1802 * security_fs_use - Determine how to handle labeling for a filesystem.
1803 * @fstype: filesystem type
1804 * @behavior: labeling behavior
1805 * @sid: SID for filesystem (superblock)
1807 int security_fs_use(
1809 unsigned int *behavior,
1817 c = policydb.ocontexts[OCON_FSUSE];
1819 if (strcmp(fstype, c->u.name) == 0)
1825 *behavior = c->v.behavior;
1827 rc = sidtab_context_to_sid(&sidtab,
1835 rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid);
1837 *behavior = SECURITY_FS_USE_NONE;
1840 *behavior = SECURITY_FS_USE_GENFS;
1849 int security_get_bools(int *len, char ***names, int **values)
1851 int i, rc = -ENOMEM;
1857 *len = policydb.p_bools.nprim;
1863 *names = kcalloc(*len, sizeof(char*), GFP_ATOMIC);
1867 *values = kcalloc(*len, sizeof(int), GFP_ATOMIC);
1871 for (i = 0; i < *len; i++) {
1873 (*values)[i] = policydb.bool_val_to_struct[i]->state;
1874 name_len = strlen(policydb.p_bool_val_to_name[i]) + 1;
1875 (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC);
1878 strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len);
1879 (*names)[i][name_len - 1] = 0;
1887 for (i = 0; i < *len; i++)
1895 int security_set_bools(int len, int *values)
1898 int lenp, seqno = 0;
1899 struct cond_node *cur;
1903 lenp = policydb.p_bools.nprim;
1909 for (i = 0; i < len; i++) {
1910 if (!!values[i] != policydb.bool_val_to_struct[i]->state) {
1911 audit_log(current->audit_context, GFP_ATOMIC,
1912 AUDIT_MAC_CONFIG_CHANGE,
1913 "bool=%s val=%d old_val=%d auid=%u ses=%u",
1914 policydb.p_bool_val_to_name[i],
1916 policydb.bool_val_to_struct[i]->state,
1917 audit_get_loginuid(current),
1918 audit_get_sessionid(current));
1921 policydb.bool_val_to_struct[i]->state = 1;
1923 policydb.bool_val_to_struct[i]->state = 0;
1927 for (cur = policydb.cond_list; cur != NULL; cur = cur->next) {
1928 rc = evaluate_cond_node(&policydb, cur);
1933 seqno = ++latest_granting;
1938 avc_ss_reset(seqno);
1939 selnl_notify_policyload(seqno);
1940 selinux_xfrm_notify_policyload();
1945 int security_get_bool_value(int bool)
1952 len = policydb.p_bools.nprim;
1958 rc = policydb.bool_val_to_struct[bool]->state;
1964 static int security_preserve_bools(struct policydb *p)
1966 int rc, nbools = 0, *bvalues = NULL, i;
1967 char **bnames = NULL;
1968 struct cond_bool_datum *booldatum;
1969 struct cond_node *cur;
1971 rc = security_get_bools(&nbools, &bnames, &bvalues);
1974 for (i = 0; i < nbools; i++) {
1975 booldatum = hashtab_search(p->p_bools.table, bnames[i]);
1977 booldatum->state = bvalues[i];
1979 for (cur = p->cond_list; cur != NULL; cur = cur->next) {
1980 rc = evaluate_cond_node(p, cur);
1987 for (i = 0; i < nbools; i++)
1996 * security_sid_mls_copy() - computes a new sid based on the given
1997 * sid and the mls portion of mls_sid.
1999 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid)
2001 struct context *context1;
2002 struct context *context2;
2003 struct context newcon;
2008 if (!ss_initialized || !selinux_mls_enabled) {
2013 context_init(&newcon);
2016 context1 = sidtab_search(&sidtab, sid);
2018 printk(KERN_ERR "security_sid_mls_copy: unrecognized SID "
2024 context2 = sidtab_search(&sidtab, mls_sid);
2026 printk(KERN_ERR "security_sid_mls_copy: unrecognized SID "
2032 newcon.user = context1->user;
2033 newcon.role = context1->role;
2034 newcon.type = context1->type;
2035 rc = mls_context_cpy(&newcon, context2);
2039 /* Check the validity of the new context. */
2040 if (!policydb_context_isvalid(&policydb, &newcon)) {
2041 rc = convert_context_handle_invalid_context(&newcon);
2046 rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid);
2050 if (!context_struct_to_string(&newcon, &s, &len)) {
2051 audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
2052 "security_sid_mls_copy: invalid context %s", s);
2058 context_destroy(&newcon);
2064 * security_net_peersid_resolve - Compare and resolve two network peer SIDs
2065 * @nlbl_sid: NetLabel SID
2066 * @nlbl_type: NetLabel labeling protocol type
2067 * @xfrm_sid: XFRM SID
2070 * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be
2071 * resolved into a single SID it is returned via @peer_sid and the function
2072 * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function
2073 * returns a negative value. A table summarizing the behavior is below:
2075 * | function return | @sid
2076 * ------------------------------+-----------------+-----------------
2077 * no peer labels | 0 | SECSID_NULL
2078 * single peer label | 0 | <peer_label>
2079 * multiple, consistent labels | 0 | <peer_label>
2080 * multiple, inconsistent labels | -<errno> | SECSID_NULL
2083 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
2088 struct context *nlbl_ctx;
2089 struct context *xfrm_ctx;
2091 /* handle the common (which also happens to be the set of easy) cases
2092 * right away, these two if statements catch everything involving a
2093 * single or absent peer SID/label */
2094 if (xfrm_sid == SECSID_NULL) {
2095 *peer_sid = nlbl_sid;
2098 /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label
2099 * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label
2101 if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) {
2102 *peer_sid = xfrm_sid;
2106 /* we don't need to check ss_initialized here since the only way both
2107 * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the
2108 * security server was initialized and ss_initialized was true */
2109 if (!selinux_mls_enabled) {
2110 *peer_sid = SECSID_NULL;
2116 nlbl_ctx = sidtab_search(&sidtab, nlbl_sid);
2119 "security_sid_mls_cmp: unrecognized SID %d\n",
2124 xfrm_ctx = sidtab_search(&sidtab, xfrm_sid);
2127 "security_sid_mls_cmp: unrecognized SID %d\n",
2132 rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES);
2137 /* at present NetLabel SIDs/labels really only carry MLS
2138 * information so if the MLS portion of the NetLabel SID
2139 * matches the MLS portion of the labeled XFRM SID/label
2140 * then pass along the XFRM SID as it is the most
2142 *peer_sid = xfrm_sid;
2144 *peer_sid = SECSID_NULL;
2148 static int get_classes_callback(void *k, void *d, void *args)
2150 struct class_datum *datum = d;
2151 char *name = k, **classes = args;
2152 int value = datum->value - 1;
2154 classes[value] = kstrdup(name, GFP_ATOMIC);
2155 if (!classes[value])
2161 int security_get_classes(char ***classes, int *nclasses)
2167 *nclasses = policydb.p_classes.nprim;
2168 *classes = kcalloc(*nclasses, sizeof(*classes), GFP_ATOMIC);
2172 rc = hashtab_map(policydb.p_classes.table, get_classes_callback,
2176 for (i = 0; i < *nclasses; i++)
2177 kfree((*classes)[i]);
2186 static int get_permissions_callback(void *k, void *d, void *args)
2188 struct perm_datum *datum = d;
2189 char *name = k, **perms = args;
2190 int value = datum->value - 1;
2192 perms[value] = kstrdup(name, GFP_ATOMIC);
2199 int security_get_permissions(char *class, char ***perms, int *nperms)
2201 int rc = -ENOMEM, i;
2202 struct class_datum *match;
2206 match = hashtab_search(policydb.p_classes.table, class);
2208 printk(KERN_ERR "%s: unrecognized class %s\n",
2214 *nperms = match->permissions.nprim;
2215 *perms = kcalloc(*nperms, sizeof(*perms), GFP_ATOMIC);
2219 if (match->comdatum) {
2220 rc = hashtab_map(match->comdatum->permissions.table,
2221 get_permissions_callback, *perms);
2226 rc = hashtab_map(match->permissions.table, get_permissions_callback,
2237 for (i = 0; i < *nperms; i++)
2243 int security_get_reject_unknown(void)
2245 return policydb.reject_unknown;
2248 int security_get_allow_unknown(void)
2250 return policydb.allow_unknown;
2254 * security_policycap_supported - Check for a specific policy capability
2255 * @req_cap: capability
2258 * This function queries the currently loaded policy to see if it supports the
2259 * capability specified by @req_cap. Returns true (1) if the capability is
2260 * supported, false (0) if it isn't supported.
2263 int security_policycap_supported(unsigned int req_cap)
2268 rc = ebitmap_get_bit(&policydb.policycaps, req_cap);
2274 struct selinux_audit_rule {
2276 struct context au_ctxt;
2279 void selinux_audit_rule_free(struct selinux_audit_rule *rule)
2282 context_destroy(&rule->au_ctxt);
2287 int selinux_audit_rule_init(u32 field, u32 op, char *rulestr,
2288 struct selinux_audit_rule **rule)
2290 struct selinux_audit_rule *tmprule;
2291 struct role_datum *roledatum;
2292 struct type_datum *typedatum;
2293 struct user_datum *userdatum;
2298 if (!ss_initialized)
2302 case AUDIT_SUBJ_USER:
2303 case AUDIT_SUBJ_ROLE:
2304 case AUDIT_SUBJ_TYPE:
2305 case AUDIT_OBJ_USER:
2306 case AUDIT_OBJ_ROLE:
2307 case AUDIT_OBJ_TYPE:
2308 /* only 'equals' and 'not equals' fit user, role, and type */
2309 if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL)
2312 case AUDIT_SUBJ_SEN:
2313 case AUDIT_SUBJ_CLR:
2314 case AUDIT_OBJ_LEV_LOW:
2315 case AUDIT_OBJ_LEV_HIGH:
2316 /* we do not allow a range, indicated by the presense of '-' */
2317 if (strchr(rulestr, '-'))
2321 /* only the above fields are valid */
2325 tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL);
2329 context_init(&tmprule->au_ctxt);
2333 tmprule->au_seqno = latest_granting;
2336 case AUDIT_SUBJ_USER:
2337 case AUDIT_OBJ_USER:
2338 userdatum = hashtab_search(policydb.p_users.table, rulestr);
2342 tmprule->au_ctxt.user = userdatum->value;
2344 case AUDIT_SUBJ_ROLE:
2345 case AUDIT_OBJ_ROLE:
2346 roledatum = hashtab_search(policydb.p_roles.table, rulestr);
2350 tmprule->au_ctxt.role = roledatum->value;
2352 case AUDIT_SUBJ_TYPE:
2353 case AUDIT_OBJ_TYPE:
2354 typedatum = hashtab_search(policydb.p_types.table, rulestr);
2358 tmprule->au_ctxt.type = typedatum->value;
2360 case AUDIT_SUBJ_SEN:
2361 case AUDIT_SUBJ_CLR:
2362 case AUDIT_OBJ_LEV_LOW:
2363 case AUDIT_OBJ_LEV_HIGH:
2364 rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC);
2371 selinux_audit_rule_free(tmprule);
2380 int selinux_audit_rule_match(u32 sid, u32 field, u32 op,
2381 struct selinux_audit_rule *rule,
2382 struct audit_context *actx)
2384 struct context *ctxt;
2385 struct mls_level *level;
2389 audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR,
2390 "selinux_audit_rule_match: missing rule\n");
2396 if (rule->au_seqno < latest_granting) {
2397 audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR,
2398 "selinux_audit_rule_match: stale rule\n");
2403 ctxt = sidtab_search(&sidtab, sid);
2405 audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR,
2406 "selinux_audit_rule_match: unrecognized SID %d\n",
2412 /* a field/op pair that is not caught here will simply fall through
2415 case AUDIT_SUBJ_USER:
2416 case AUDIT_OBJ_USER:
2419 match = (ctxt->user == rule->au_ctxt.user);
2421 case AUDIT_NOT_EQUAL:
2422 match = (ctxt->user != rule->au_ctxt.user);
2426 case AUDIT_SUBJ_ROLE:
2427 case AUDIT_OBJ_ROLE:
2430 match = (ctxt->role == rule->au_ctxt.role);
2432 case AUDIT_NOT_EQUAL:
2433 match = (ctxt->role != rule->au_ctxt.role);
2437 case AUDIT_SUBJ_TYPE:
2438 case AUDIT_OBJ_TYPE:
2441 match = (ctxt->type == rule->au_ctxt.type);
2443 case AUDIT_NOT_EQUAL:
2444 match = (ctxt->type != rule->au_ctxt.type);
2448 case AUDIT_SUBJ_SEN:
2449 case AUDIT_SUBJ_CLR:
2450 case AUDIT_OBJ_LEV_LOW:
2451 case AUDIT_OBJ_LEV_HIGH:
2452 level = ((field == AUDIT_SUBJ_SEN ||
2453 field == AUDIT_OBJ_LEV_LOW) ?
2454 &ctxt->range.level[0] : &ctxt->range.level[1]);
2457 match = mls_level_eq(&rule->au_ctxt.range.level[0],
2460 case AUDIT_NOT_EQUAL:
2461 match = !mls_level_eq(&rule->au_ctxt.range.level[0],
2464 case AUDIT_LESS_THAN:
2465 match = (mls_level_dom(&rule->au_ctxt.range.level[0],
2467 !mls_level_eq(&rule->au_ctxt.range.level[0],
2470 case AUDIT_LESS_THAN_OR_EQUAL:
2471 match = mls_level_dom(&rule->au_ctxt.range.level[0],
2474 case AUDIT_GREATER_THAN:
2475 match = (mls_level_dom(level,
2476 &rule->au_ctxt.range.level[0]) &&
2477 !mls_level_eq(level,
2478 &rule->au_ctxt.range.level[0]));
2480 case AUDIT_GREATER_THAN_OR_EQUAL:
2481 match = mls_level_dom(level,
2482 &rule->au_ctxt.range.level[0]);
2492 static int (*aurule_callback)(void) = NULL;
2494 static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid,
2495 u16 class, u32 perms, u32 *retained)
2499 if (event == AVC_CALLBACK_RESET && aurule_callback)
2500 err = aurule_callback();
2504 static int __init aurule_init(void)
2508 err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET,
2509 SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0);
2511 panic("avc_add_callback() failed, error %d\n", err);
2515 __initcall(aurule_init);
2517 void selinux_audit_set_callback(int (*callback)(void))
2519 aurule_callback = callback;
2522 #ifdef CONFIG_NETLABEL
2524 * security_netlbl_cache_add - Add an entry to the NetLabel cache
2525 * @secattr: the NetLabel packet security attributes
2526 * @sid: the SELinux SID
2529 * Attempt to cache the context in @ctx, which was derived from the packet in
2530 * @skb, in the NetLabel subsystem cache. This function assumes @secattr has
2531 * already been initialized.
2534 static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr,
2539 sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC);
2540 if (sid_cache == NULL)
2542 secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC);
2543 if (secattr->cache == NULL) {
2549 secattr->cache->free = kfree;
2550 secattr->cache->data = sid_cache;
2551 secattr->flags |= NETLBL_SECATTR_CACHE;
2555 * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID
2556 * @secattr: the NetLabel packet security attributes
2557 * @sid: the SELinux SID
2560 * Convert the given NetLabel security attributes in @secattr into a
2561 * SELinux SID. If the @secattr field does not contain a full SELinux
2562 * SID/context then use SECINITSID_NETMSG as the foundation. If possibile the
2563 * 'cache' field of @secattr is set and the CACHE flag is set; this is to
2564 * allow the @secattr to be used by NetLabel to cache the secattr to SID
2565 * conversion for future lookups. Returns zero on success, negative values on
2569 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
2573 struct context *ctx;
2574 struct context ctx_new;
2576 if (!ss_initialized) {
2583 if (secattr->flags & NETLBL_SECATTR_CACHE) {
2584 *sid = *(u32 *)secattr->cache->data;
2586 } else if (secattr->flags & NETLBL_SECATTR_SECID) {
2587 *sid = secattr->attr.secid;
2589 } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) {
2590 ctx = sidtab_search(&sidtab, SECINITSID_NETMSG);
2592 goto netlbl_secattr_to_sid_return;
2594 ctx_new.user = ctx->user;
2595 ctx_new.role = ctx->role;
2596 ctx_new.type = ctx->type;
2597 mls_import_netlbl_lvl(&ctx_new, secattr);
2598 if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
2599 if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat,
2600 secattr->attr.mls.cat) != 0)
2601 goto netlbl_secattr_to_sid_return;
2602 ctx_new.range.level[1].cat.highbit =
2603 ctx_new.range.level[0].cat.highbit;
2604 ctx_new.range.level[1].cat.node =
2605 ctx_new.range.level[0].cat.node;
2607 ebitmap_init(&ctx_new.range.level[0].cat);
2608 ebitmap_init(&ctx_new.range.level[1].cat);
2610 if (mls_context_isvalid(&policydb, &ctx_new) != 1)
2611 goto netlbl_secattr_to_sid_return_cleanup;
2613 rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid);
2615 goto netlbl_secattr_to_sid_return_cleanup;
2617 security_netlbl_cache_add(secattr, *sid);
2619 ebitmap_destroy(&ctx_new.range.level[0].cat);
2625 netlbl_secattr_to_sid_return:
2628 netlbl_secattr_to_sid_return_cleanup:
2629 ebitmap_destroy(&ctx_new.range.level[0].cat);
2630 goto netlbl_secattr_to_sid_return;
2634 * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr
2635 * @sid: the SELinux SID
2636 * @secattr: the NetLabel packet security attributes
2639 * Convert the given SELinux SID in @sid into a NetLabel security attribute.
2640 * Returns zero on success, negative values on failure.
2643 int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr)
2646 struct context *ctx;
2648 if (!ss_initialized)
2652 ctx = sidtab_search(&sidtab, sid);
2654 goto netlbl_sid_to_secattr_failure;
2655 secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1],
2657 secattr->flags |= NETLBL_SECATTR_DOMAIN;
2658 mls_export_netlbl_lvl(ctx, secattr);
2659 rc = mls_export_netlbl_cat(ctx, secattr);
2661 goto netlbl_sid_to_secattr_failure;
2666 netlbl_sid_to_secattr_failure:
2670 #endif /* CONFIG_NETLABEL */