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
20 * Updated: Chad Sellers <csellers@tresys.com>
22 * Added validation of kernel classes and permissions
24 * Copyright (C) 2006 Hewlett-Packard Development Company, L.P.
25 * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
26 * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC
27 * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
28 * This program is free software; you can redistribute it and/or modify
29 * it under the terms of the GNU General Public License as published by
30 * the Free Software Foundation, version 2.
32 #include <linux/kernel.h>
33 #include <linux/slab.h>
34 #include <linux/string.h>
35 #include <linux/spinlock.h>
36 #include <linux/rcupdate.h>
37 #include <linux/errno.h>
39 #include <linux/sched.h>
40 #include <linux/audit.h>
41 #include <linux/mutex.h>
42 #include <net/netlabel.h>
52 #include "conditional.h"
59 extern void selnl_notify_policyload(u32 seqno
);
60 unsigned int policydb_loaded_version
;
63 * This is declared in avc.c
65 extern const struct selinux_class_perm selinux_class_perm
;
67 static DEFINE_RWLOCK(policy_rwlock
);
68 #define POLICY_RDLOCK read_lock(&policy_rwlock)
69 #define POLICY_WRLOCK write_lock_irq(&policy_rwlock)
70 #define POLICY_RDUNLOCK read_unlock(&policy_rwlock)
71 #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock)
73 static DEFINE_MUTEX(load_mutex
);
74 #define LOAD_LOCK mutex_lock(&load_mutex)
75 #define LOAD_UNLOCK mutex_unlock(&load_mutex)
77 static struct sidtab sidtab
;
78 struct policydb policydb
;
79 int ss_initialized
= 0;
82 * The largest sequence number that has been used when
83 * providing an access decision to the access vector cache.
84 * The sequence number only changes when a policy change
87 static u32 latest_granting
= 0;
89 /* Forward declaration. */
90 static int context_struct_to_string(struct context
*context
, char **scontext
,
94 * Return the boolean value of a constraint expression
95 * when it is applied to the specified source and target
98 * xcontext is a special beast... It is used by the validatetrans rules
99 * only. For these rules, scontext is the context before the transition,
100 * tcontext is the context after the transition, and xcontext is the context
101 * of the process performing the transition. All other callers of
102 * constraint_expr_eval should pass in NULL for xcontext.
104 static int constraint_expr_eval(struct context
*scontext
,
105 struct context
*tcontext
,
106 struct context
*xcontext
,
107 struct constraint_expr
*cexpr
)
111 struct role_datum
*r1
, *r2
;
112 struct mls_level
*l1
, *l2
;
113 struct constraint_expr
*e
;
114 int s
[CEXPR_MAXDEPTH
];
117 for (e
= cexpr
; e
; e
= e
->next
) {
118 switch (e
->expr_type
) {
134 if (sp
== (CEXPR_MAXDEPTH
-1))
138 val1
= scontext
->user
;
139 val2
= tcontext
->user
;
142 val1
= scontext
->type
;
143 val2
= tcontext
->type
;
146 val1
= scontext
->role
;
147 val2
= tcontext
->role
;
148 r1
= policydb
.role_val_to_struct
[val1
- 1];
149 r2
= policydb
.role_val_to_struct
[val2
- 1];
152 s
[++sp
] = ebitmap_get_bit(&r1
->dominates
,
156 s
[++sp
] = ebitmap_get_bit(&r2
->dominates
,
160 s
[++sp
] = ( !ebitmap_get_bit(&r1
->dominates
,
162 !ebitmap_get_bit(&r2
->dominates
,
170 l1
= &(scontext
->range
.level
[0]);
171 l2
= &(tcontext
->range
.level
[0]);
174 l1
= &(scontext
->range
.level
[0]);
175 l2
= &(tcontext
->range
.level
[1]);
178 l1
= &(scontext
->range
.level
[1]);
179 l2
= &(tcontext
->range
.level
[0]);
182 l1
= &(scontext
->range
.level
[1]);
183 l2
= &(tcontext
->range
.level
[1]);
186 l1
= &(scontext
->range
.level
[0]);
187 l2
= &(scontext
->range
.level
[1]);
190 l1
= &(tcontext
->range
.level
[0]);
191 l2
= &(tcontext
->range
.level
[1]);
196 s
[++sp
] = mls_level_eq(l1
, l2
);
199 s
[++sp
] = !mls_level_eq(l1
, l2
);
202 s
[++sp
] = mls_level_dom(l1
, l2
);
205 s
[++sp
] = mls_level_dom(l2
, l1
);
208 s
[++sp
] = mls_level_incomp(l2
, l1
);
222 s
[++sp
] = (val1
== val2
);
225 s
[++sp
] = (val1
!= val2
);
233 if (sp
== (CEXPR_MAXDEPTH
-1))
236 if (e
->attr
& CEXPR_TARGET
)
238 else if (e
->attr
& CEXPR_XTARGET
) {
245 if (e
->attr
& CEXPR_USER
)
247 else if (e
->attr
& CEXPR_ROLE
)
249 else if (e
->attr
& CEXPR_TYPE
)
258 s
[++sp
] = ebitmap_get_bit(&e
->names
, val1
- 1);
261 s
[++sp
] = !ebitmap_get_bit(&e
->names
, val1
- 1);
279 * Compute access vectors based on a context structure pair for
280 * the permissions in a particular class.
282 static int context_struct_compute_av(struct context
*scontext
,
283 struct context
*tcontext
,
286 struct av_decision
*avd
)
288 struct constraint_node
*constraint
;
289 struct role_allow
*ra
;
290 struct avtab_key avkey
;
291 struct avtab_node
*node
;
292 struct class_datum
*tclass_datum
;
293 struct ebitmap
*sattr
, *tattr
;
294 struct ebitmap_node
*snode
, *tnode
;
298 * Remap extended Netlink classes for old policy versions.
299 * Do this here rather than socket_type_to_security_class()
300 * in case a newer policy version is loaded, allowing sockets
301 * to remain in the correct class.
303 if (policydb_loaded_version
< POLICYDB_VERSION_NLCLASS
)
304 if (tclass
>= SECCLASS_NETLINK_ROUTE_SOCKET
&&
305 tclass
<= SECCLASS_NETLINK_DNRT_SOCKET
)
306 tclass
= SECCLASS_NETLINK_SOCKET
;
308 if (!tclass
|| tclass
> policydb
.p_classes
.nprim
) {
309 printk(KERN_ERR
"security_compute_av: unrecognized class %d\n",
313 tclass_datum
= policydb
.class_val_to_struct
[tclass
- 1];
316 * Initialize the access vectors to the default values.
319 avd
->decided
= 0xffffffff;
321 avd
->auditdeny
= 0xffffffff;
322 avd
->seqno
= latest_granting
;
325 * If a specific type enforcement rule was defined for
326 * this permission check, then use it.
328 avkey
.target_class
= tclass
;
329 avkey
.specified
= AVTAB_AV
;
330 sattr
= &policydb
.type_attr_map
[scontext
->type
- 1];
331 tattr
= &policydb
.type_attr_map
[tcontext
->type
- 1];
332 ebitmap_for_each_bit(sattr
, snode
, i
) {
333 if (!ebitmap_node_get_bit(snode
, i
))
335 ebitmap_for_each_bit(tattr
, tnode
, j
) {
336 if (!ebitmap_node_get_bit(tnode
, j
))
338 avkey
.source_type
= i
+ 1;
339 avkey
.target_type
= j
+ 1;
340 for (node
= avtab_search_node(&policydb
.te_avtab
, &avkey
);
342 node
= avtab_search_node_next(node
, avkey
.specified
)) {
343 if (node
->key
.specified
== AVTAB_ALLOWED
)
344 avd
->allowed
|= node
->datum
.data
;
345 else if (node
->key
.specified
== AVTAB_AUDITALLOW
)
346 avd
->auditallow
|= node
->datum
.data
;
347 else if (node
->key
.specified
== AVTAB_AUDITDENY
)
348 avd
->auditdeny
&= node
->datum
.data
;
351 /* Check conditional av table for additional permissions */
352 cond_compute_av(&policydb
.te_cond_avtab
, &avkey
, avd
);
358 * Remove any permissions prohibited by a constraint (this includes
361 constraint
= tclass_datum
->constraints
;
363 if ((constraint
->permissions
& (avd
->allowed
)) &&
364 !constraint_expr_eval(scontext
, tcontext
, NULL
,
366 avd
->allowed
= (avd
->allowed
) & ~(constraint
->permissions
);
368 constraint
= constraint
->next
;
372 * If checking process transition permission and the
373 * role is changing, then check the (current_role, new_role)
376 if (tclass
== SECCLASS_PROCESS
&&
377 (avd
->allowed
& (PROCESS__TRANSITION
| PROCESS__DYNTRANSITION
)) &&
378 scontext
->role
!= tcontext
->role
) {
379 for (ra
= policydb
.role_allow
; ra
; ra
= ra
->next
) {
380 if (scontext
->role
== ra
->role
&&
381 tcontext
->role
== ra
->new_role
)
385 avd
->allowed
= (avd
->allowed
) & ~(PROCESS__TRANSITION
|
386 PROCESS__DYNTRANSITION
);
392 static int security_validtrans_handle_fail(struct context
*ocontext
,
393 struct context
*ncontext
,
394 struct context
*tcontext
,
397 char *o
= NULL
, *n
= NULL
, *t
= NULL
;
398 u32 olen
, nlen
, tlen
;
400 if (context_struct_to_string(ocontext
, &o
, &olen
) < 0)
402 if (context_struct_to_string(ncontext
, &n
, &nlen
) < 0)
404 if (context_struct_to_string(tcontext
, &t
, &tlen
) < 0)
406 audit_log(current
->audit_context
, GFP_ATOMIC
, AUDIT_SELINUX_ERR
,
407 "security_validate_transition: denied for"
408 " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s",
409 o
, n
, t
, policydb
.p_class_val_to_name
[tclass
-1]);
415 if (!selinux_enforcing
)
420 int security_validate_transition(u32 oldsid
, u32 newsid
, u32 tasksid
,
423 struct context
*ocontext
;
424 struct context
*ncontext
;
425 struct context
*tcontext
;
426 struct class_datum
*tclass_datum
;
427 struct constraint_node
*constraint
;
436 * Remap extended Netlink classes for old policy versions.
437 * Do this here rather than socket_type_to_security_class()
438 * in case a newer policy version is loaded, allowing sockets
439 * to remain in the correct class.
441 if (policydb_loaded_version
< POLICYDB_VERSION_NLCLASS
)
442 if (tclass
>= SECCLASS_NETLINK_ROUTE_SOCKET
&&
443 tclass
<= SECCLASS_NETLINK_DNRT_SOCKET
)
444 tclass
= SECCLASS_NETLINK_SOCKET
;
446 if (!tclass
|| tclass
> policydb
.p_classes
.nprim
) {
447 printk(KERN_ERR
"security_validate_transition: "
448 "unrecognized class %d\n", tclass
);
452 tclass_datum
= policydb
.class_val_to_struct
[tclass
- 1];
454 ocontext
= sidtab_search(&sidtab
, oldsid
);
456 printk(KERN_ERR
"security_validate_transition: "
457 " unrecognized SID %d\n", oldsid
);
462 ncontext
= sidtab_search(&sidtab
, newsid
);
464 printk(KERN_ERR
"security_validate_transition: "
465 " unrecognized SID %d\n", newsid
);
470 tcontext
= sidtab_search(&sidtab
, tasksid
);
472 printk(KERN_ERR
"security_validate_transition: "
473 " unrecognized SID %d\n", tasksid
);
478 constraint
= tclass_datum
->validatetrans
;
480 if (!constraint_expr_eval(ocontext
, ncontext
, tcontext
,
482 rc
= security_validtrans_handle_fail(ocontext
, ncontext
,
486 constraint
= constraint
->next
;
495 * security_compute_av - Compute access vector decisions.
496 * @ssid: source security identifier
497 * @tsid: target security identifier
498 * @tclass: target security class
499 * @requested: requested permissions
500 * @avd: access vector decisions
502 * Compute a set of access vector decisions based on the
503 * SID pair (@ssid, @tsid) for the permissions in @tclass.
504 * Return -%EINVAL if any of the parameters are invalid or %0
505 * if the access vector decisions were computed successfully.
507 int security_compute_av(u32 ssid
,
511 struct av_decision
*avd
)
513 struct context
*scontext
= NULL
, *tcontext
= NULL
;
516 if (!ss_initialized
) {
517 avd
->allowed
= 0xffffffff;
518 avd
->decided
= 0xffffffff;
520 avd
->auditdeny
= 0xffffffff;
521 avd
->seqno
= latest_granting
;
527 scontext
= sidtab_search(&sidtab
, ssid
);
529 printk(KERN_ERR
"security_compute_av: unrecognized SID %d\n",
534 tcontext
= sidtab_search(&sidtab
, tsid
);
536 printk(KERN_ERR
"security_compute_av: unrecognized SID %d\n",
542 rc
= context_struct_compute_av(scontext
, tcontext
, tclass
,
550 * Write the security context string representation of
551 * the context structure `context' into a dynamically
552 * allocated string of the correct size. Set `*scontext'
553 * to point to this string and set `*scontext_len' to
554 * the length of the string.
556 static int context_struct_to_string(struct context
*context
, char **scontext
, u32
*scontext_len
)
563 /* Compute the size of the context. */
564 *scontext_len
+= strlen(policydb
.p_user_val_to_name
[context
->user
- 1]) + 1;
565 *scontext_len
+= strlen(policydb
.p_role_val_to_name
[context
->role
- 1]) + 1;
566 *scontext_len
+= strlen(policydb
.p_type_val_to_name
[context
->type
- 1]) + 1;
567 *scontext_len
+= mls_compute_context_len(context
);
569 /* Allocate space for the context; caller must free this space. */
570 scontextp
= kmalloc(*scontext_len
, GFP_ATOMIC
);
574 *scontext
= scontextp
;
577 * Copy the user name, role name and type name into the context.
579 sprintf(scontextp
, "%s:%s:%s",
580 policydb
.p_user_val_to_name
[context
->user
- 1],
581 policydb
.p_role_val_to_name
[context
->role
- 1],
582 policydb
.p_type_val_to_name
[context
->type
- 1]);
583 scontextp
+= strlen(policydb
.p_user_val_to_name
[context
->user
- 1]) +
584 1 + strlen(policydb
.p_role_val_to_name
[context
->role
- 1]) +
585 1 + strlen(policydb
.p_type_val_to_name
[context
->type
- 1]);
587 mls_sid_to_context(context
, &scontextp
);
594 #include "initial_sid_to_string.h"
597 * security_sid_to_context - Obtain a context for a given SID.
598 * @sid: security identifier, SID
599 * @scontext: security context
600 * @scontext_len: length in bytes
602 * Write the string representation of the context associated with @sid
603 * into a dynamically allocated string of the correct size. Set @scontext
604 * to point to this string and set @scontext_len to the length of the string.
606 int security_sid_to_context(u32 sid
, char **scontext
, u32
*scontext_len
)
608 struct context
*context
;
614 if (!ss_initialized
) {
615 if (sid
<= SECINITSID_NUM
) {
618 *scontext_len
= strlen(initial_sid_to_string
[sid
]) + 1;
619 scontextp
= kmalloc(*scontext_len
,GFP_ATOMIC
);
624 strcpy(scontextp
, initial_sid_to_string
[sid
]);
625 *scontext
= scontextp
;
628 printk(KERN_ERR
"security_sid_to_context: called before initial "
629 "load_policy on unknown SID %d\n", sid
);
634 context
= sidtab_search(&sidtab
, sid
);
636 printk(KERN_ERR
"security_sid_to_context: unrecognized SID "
641 rc
= context_struct_to_string(context
, scontext
, scontext_len
);
649 static int security_context_to_sid_core(char *scontext
, u32 scontext_len
, u32
*sid
, u32 def_sid
)
652 struct context context
;
653 struct role_datum
*role
;
654 struct type_datum
*typdatum
;
655 struct user_datum
*usrdatum
;
656 char *scontextp
, *p
, oldc
;
659 if (!ss_initialized
) {
662 for (i
= 1; i
< SECINITSID_NUM
; i
++) {
663 if (!strcmp(initial_sid_to_string
[i
], scontext
)) {
668 *sid
= SECINITSID_KERNEL
;
673 /* Copy the string so that we can modify the copy as we parse it.
674 The string should already by null terminated, but we append a
675 null suffix to the copy to avoid problems with the existing
676 attr package, which doesn't view the null terminator as part
677 of the attribute value. */
678 scontext2
= kmalloc(scontext_len
+1,GFP_KERNEL
);
683 memcpy(scontext2
, scontext
, scontext_len
);
684 scontext2
[scontext_len
] = 0;
686 context_init(&context
);
691 /* Parse the security context. */
694 scontextp
= (char *) scontext2
;
696 /* Extract the user. */
698 while (*p
&& *p
!= ':')
706 usrdatum
= hashtab_search(policydb
.p_users
.table
, scontextp
);
710 context
.user
= usrdatum
->value
;
714 while (*p
&& *p
!= ':')
722 role
= hashtab_search(policydb
.p_roles
.table
, scontextp
);
725 context
.role
= role
->value
;
729 while (*p
&& *p
!= ':')
734 typdatum
= hashtab_search(policydb
.p_types
.table
, scontextp
);
738 context
.type
= typdatum
->value
;
740 rc
= mls_context_to_sid(oldc
, &p
, &context
, &sidtab
, def_sid
);
744 if ((p
- scontext2
) < scontext_len
) {
749 /* Check the validity of the new context. */
750 if (!policydb_context_isvalid(&policydb
, &context
)) {
754 /* Obtain the new sid. */
755 rc
= sidtab_context_to_sid(&sidtab
, &context
, sid
);
758 context_destroy(&context
);
765 * security_context_to_sid - Obtain a SID for a given security context.
766 * @scontext: security context
767 * @scontext_len: length in bytes
768 * @sid: security identifier, SID
770 * Obtains a SID associated with the security context that
771 * has the string representation specified by @scontext.
772 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
773 * memory is available, or 0 on success.
775 int security_context_to_sid(char *scontext
, u32 scontext_len
, u32
*sid
)
777 return security_context_to_sid_core(scontext
, scontext_len
,
782 * security_context_to_sid_default - Obtain a SID for a given security context,
783 * falling back to specified default if needed.
785 * @scontext: security context
786 * @scontext_len: length in bytes
787 * @sid: security identifier, SID
788 * @def_sid: default SID to assign on errror
790 * Obtains a SID associated with the security context that
791 * has the string representation specified by @scontext.
792 * The default SID is passed to the MLS layer to be used to allow
793 * kernel labeling of the MLS field if the MLS field is not present
794 * (for upgrading to MLS without full relabel).
795 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
796 * memory is available, or 0 on success.
798 int security_context_to_sid_default(char *scontext
, u32 scontext_len
, u32
*sid
, u32 def_sid
)
800 return security_context_to_sid_core(scontext
, scontext_len
,
804 static int compute_sid_handle_invalid_context(
805 struct context
*scontext
,
806 struct context
*tcontext
,
808 struct context
*newcontext
)
810 char *s
= NULL
, *t
= NULL
, *n
= NULL
;
811 u32 slen
, tlen
, nlen
;
813 if (context_struct_to_string(scontext
, &s
, &slen
) < 0)
815 if (context_struct_to_string(tcontext
, &t
, &tlen
) < 0)
817 if (context_struct_to_string(newcontext
, &n
, &nlen
) < 0)
819 audit_log(current
->audit_context
, GFP_ATOMIC
, AUDIT_SELINUX_ERR
,
820 "security_compute_sid: invalid context %s"
824 n
, s
, t
, policydb
.p_class_val_to_name
[tclass
-1]);
829 if (!selinux_enforcing
)
834 static int security_compute_sid(u32 ssid
,
840 struct context
*scontext
= NULL
, *tcontext
= NULL
, newcontext
;
841 struct role_trans
*roletr
= NULL
;
842 struct avtab_key avkey
;
843 struct avtab_datum
*avdatum
;
844 struct avtab_node
*node
;
847 if (!ss_initialized
) {
849 case SECCLASS_PROCESS
:
859 context_init(&newcontext
);
863 scontext
= sidtab_search(&sidtab
, ssid
);
865 printk(KERN_ERR
"security_compute_sid: unrecognized SID %d\n",
870 tcontext
= sidtab_search(&sidtab
, tsid
);
872 printk(KERN_ERR
"security_compute_sid: unrecognized SID %d\n",
878 /* Set the user identity. */
880 case AVTAB_TRANSITION
:
882 /* Use the process user identity. */
883 newcontext
.user
= scontext
->user
;
886 /* Use the related object owner. */
887 newcontext
.user
= tcontext
->user
;
891 /* Set the role and type to default values. */
893 case SECCLASS_PROCESS
:
894 /* Use the current role and type of process. */
895 newcontext
.role
= scontext
->role
;
896 newcontext
.type
= scontext
->type
;
899 /* Use the well-defined object role. */
900 newcontext
.role
= OBJECT_R_VAL
;
901 /* Use the type of the related object. */
902 newcontext
.type
= tcontext
->type
;
905 /* Look for a type transition/member/change rule. */
906 avkey
.source_type
= scontext
->type
;
907 avkey
.target_type
= tcontext
->type
;
908 avkey
.target_class
= tclass
;
909 avkey
.specified
= specified
;
910 avdatum
= avtab_search(&policydb
.te_avtab
, &avkey
);
912 /* If no permanent rule, also check for enabled conditional rules */
914 node
= avtab_search_node(&policydb
.te_cond_avtab
, &avkey
);
915 for (; node
!= NULL
; node
= avtab_search_node_next(node
, specified
)) {
916 if (node
->key
.specified
& AVTAB_ENABLED
) {
917 avdatum
= &node
->datum
;
924 /* Use the type from the type transition/member/change rule. */
925 newcontext
.type
= avdatum
->data
;
928 /* Check for class-specific changes. */
930 case SECCLASS_PROCESS
:
931 if (specified
& AVTAB_TRANSITION
) {
932 /* Look for a role transition rule. */
933 for (roletr
= policydb
.role_tr
; roletr
;
934 roletr
= roletr
->next
) {
935 if (roletr
->role
== scontext
->role
&&
936 roletr
->type
== tcontext
->type
) {
937 /* Use the role transition rule. */
938 newcontext
.role
= roletr
->new_role
;
948 /* Set the MLS attributes.
949 This is done last because it may allocate memory. */
950 rc
= mls_compute_sid(scontext
, tcontext
, tclass
, specified
, &newcontext
);
954 /* Check the validity of the context. */
955 if (!policydb_context_isvalid(&policydb
, &newcontext
)) {
956 rc
= compute_sid_handle_invalid_context(scontext
,
963 /* Obtain the sid for the context. */
964 rc
= sidtab_context_to_sid(&sidtab
, &newcontext
, out_sid
);
967 context_destroy(&newcontext
);
973 * security_transition_sid - Compute the SID for a new subject/object.
974 * @ssid: source security identifier
975 * @tsid: target security identifier
976 * @tclass: target security class
977 * @out_sid: security identifier for new subject/object
979 * Compute a SID to use for labeling a new subject or object in the
980 * class @tclass based on a SID pair (@ssid, @tsid).
981 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
982 * if insufficient memory is available, or %0 if the new SID was
983 * computed successfully.
985 int security_transition_sid(u32 ssid
,
990 return security_compute_sid(ssid
, tsid
, tclass
, AVTAB_TRANSITION
, out_sid
);
994 * security_member_sid - Compute the SID for member selection.
995 * @ssid: source security identifier
996 * @tsid: target security identifier
997 * @tclass: target security class
998 * @out_sid: security identifier for selected member
1000 * Compute a SID to use when selecting a member of a polyinstantiated
1001 * object of class @tclass based on a SID pair (@ssid, @tsid).
1002 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1003 * if insufficient memory is available, or %0 if the SID was
1004 * computed successfully.
1006 int security_member_sid(u32 ssid
,
1011 return security_compute_sid(ssid
, tsid
, tclass
, AVTAB_MEMBER
, out_sid
);
1015 * security_change_sid - Compute the SID for object relabeling.
1016 * @ssid: source security identifier
1017 * @tsid: target security identifier
1018 * @tclass: target security class
1019 * @out_sid: security identifier for selected member
1021 * Compute a SID to use for relabeling an object of class @tclass
1022 * based on a SID pair (@ssid, @tsid).
1023 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1024 * if insufficient memory is available, or %0 if the SID was
1025 * computed successfully.
1027 int security_change_sid(u32 ssid
,
1032 return security_compute_sid(ssid
, tsid
, tclass
, AVTAB_CHANGE
, out_sid
);
1036 * Verify that each kernel class that is defined in the
1039 static int validate_classes(struct policydb
*p
)
1042 struct class_datum
*cladatum
;
1043 struct perm_datum
*perdatum
;
1044 u32 nprim
, tmp
, common_pts_len
, perm_val
, pol_val
;
1046 const struct selinux_class_perm
*kdefs
= &selinux_class_perm
;
1047 const char *def_class
, *def_perm
, *pol_class
;
1048 struct symtab
*perms
;
1050 for (i
= 1; i
< kdefs
->cts_len
; i
++) {
1051 def_class
= kdefs
->class_to_string
[i
];
1052 if (i
> p
->p_classes
.nprim
) {
1054 "security: class %s not defined in policy\n",
1058 pol_class
= p
->p_class_val_to_name
[i
-1];
1059 if (strcmp(pol_class
, def_class
)) {
1061 "security: class %d is incorrect, found %s but should be %s\n",
1062 i
, pol_class
, def_class
);
1066 for (i
= 0; i
< kdefs
->av_pts_len
; i
++) {
1067 class_val
= kdefs
->av_perm_to_string
[i
].tclass
;
1068 perm_val
= kdefs
->av_perm_to_string
[i
].value
;
1069 def_perm
= kdefs
->av_perm_to_string
[i
].name
;
1070 if (class_val
> p
->p_classes
.nprim
)
1072 pol_class
= p
->p_class_val_to_name
[class_val
-1];
1073 cladatum
= hashtab_search(p
->p_classes
.table
, pol_class
);
1075 perms
= &cladatum
->permissions
;
1076 nprim
= 1 << (perms
->nprim
- 1);
1077 if (perm_val
> nprim
) {
1079 "security: permission %s in class %s not defined in policy\n",
1080 def_perm
, pol_class
);
1083 perdatum
= hashtab_search(perms
->table
, def_perm
);
1084 if (perdatum
== NULL
) {
1086 "security: permission %s in class %s not found in policy\n",
1087 def_perm
, pol_class
);
1090 pol_val
= 1 << (perdatum
->value
- 1);
1091 if (pol_val
!= perm_val
) {
1093 "security: permission %s in class %s has incorrect value\n",
1094 def_perm
, pol_class
);
1098 for (i
= 0; i
< kdefs
->av_inherit_len
; i
++) {
1099 class_val
= kdefs
->av_inherit
[i
].tclass
;
1100 if (class_val
> p
->p_classes
.nprim
)
1102 pol_class
= p
->p_class_val_to_name
[class_val
-1];
1103 cladatum
= hashtab_search(p
->p_classes
.table
, pol_class
);
1105 if (!cladatum
->comdatum
) {
1107 "security: class %s should have an inherits clause but does not\n",
1111 tmp
= kdefs
->av_inherit
[i
].common_base
;
1113 while (!(tmp
& 0x01)) {
1117 perms
= &cladatum
->comdatum
->permissions
;
1118 for (j
= 0; j
< common_pts_len
; j
++) {
1119 def_perm
= kdefs
->av_inherit
[i
].common_pts
[j
];
1120 if (j
>= perms
->nprim
) {
1122 "security: permission %s in class %s not defined in policy\n",
1123 def_perm
, pol_class
);
1126 perdatum
= hashtab_search(perms
->table
, def_perm
);
1127 if (perdatum
== NULL
) {
1129 "security: permission %s in class %s not found in policy\n",
1130 def_perm
, pol_class
);
1133 if (perdatum
->value
!= j
+ 1) {
1135 "security: permission %s in class %s has incorrect value\n",
1136 def_perm
, pol_class
);
1144 /* Clone the SID into the new SID table. */
1145 static int clone_sid(u32 sid
,
1146 struct context
*context
,
1149 struct sidtab
*s
= arg
;
1151 return sidtab_insert(s
, sid
, context
);
1154 static inline int convert_context_handle_invalid_context(struct context
*context
)
1158 if (selinux_enforcing
) {
1164 context_struct_to_string(context
, &s
, &len
);
1165 printk(KERN_ERR
"security: context %s is invalid\n", s
);
1171 struct convert_context_args
{
1172 struct policydb
*oldp
;
1173 struct policydb
*newp
;
1177 * Convert the values in the security context
1178 * structure `c' from the values specified
1179 * in the policy `p->oldp' to the values specified
1180 * in the policy `p->newp'. Verify that the
1181 * context is valid under the new policy.
1183 static int convert_context(u32 key
,
1187 struct convert_context_args
*args
;
1188 struct context oldc
;
1189 struct role_datum
*role
;
1190 struct type_datum
*typdatum
;
1191 struct user_datum
*usrdatum
;
1198 rc
= context_cpy(&oldc
, c
);
1204 /* Convert the user. */
1205 usrdatum
= hashtab_search(args
->newp
->p_users
.table
,
1206 args
->oldp
->p_user_val_to_name
[c
->user
- 1]);
1210 c
->user
= usrdatum
->value
;
1212 /* Convert the role. */
1213 role
= hashtab_search(args
->newp
->p_roles
.table
,
1214 args
->oldp
->p_role_val_to_name
[c
->role
- 1]);
1218 c
->role
= role
->value
;
1220 /* Convert the type. */
1221 typdatum
= hashtab_search(args
->newp
->p_types
.table
,
1222 args
->oldp
->p_type_val_to_name
[c
->type
- 1]);
1226 c
->type
= typdatum
->value
;
1228 rc
= mls_convert_context(args
->oldp
, args
->newp
, c
);
1232 /* Check the validity of the new context. */
1233 if (!policydb_context_isvalid(args
->newp
, c
)) {
1234 rc
= convert_context_handle_invalid_context(&oldc
);
1239 context_destroy(&oldc
);
1243 context_struct_to_string(&oldc
, &s
, &len
);
1244 context_destroy(&oldc
);
1245 printk(KERN_ERR
"security: invalidating context %s\n", s
);
1250 extern void selinux_complete_init(void);
1253 * security_load_policy - Load a security policy configuration.
1254 * @data: binary policy data
1255 * @len: length of data in bytes
1257 * Load a new set of security policy configuration data,
1258 * validate it and convert the SID table as necessary.
1259 * This function will flush the access vector cache after
1260 * loading the new policy.
1262 int security_load_policy(void *data
, size_t len
)
1264 struct policydb oldpolicydb
, newpolicydb
;
1265 struct sidtab oldsidtab
, newsidtab
;
1266 struct convert_context_args args
;
1269 struct policy_file file
= { data
, len
}, *fp
= &file
;
1273 if (!ss_initialized
) {
1275 if (policydb_read(&policydb
, fp
)) {
1277 avtab_cache_destroy();
1280 if (policydb_load_isids(&policydb
, &sidtab
)) {
1282 policydb_destroy(&policydb
);
1283 avtab_cache_destroy();
1286 /* Verify that the kernel defined classes are correct. */
1287 if (validate_classes(&policydb
)) {
1289 "security: the definition of a class is incorrect\n");
1291 sidtab_destroy(&sidtab
);
1292 policydb_destroy(&policydb
);
1293 avtab_cache_destroy();
1296 policydb_loaded_version
= policydb
.policyvers
;
1298 seqno
= ++latest_granting
;
1300 selinux_complete_init();
1301 avc_ss_reset(seqno
);
1302 selnl_notify_policyload(seqno
);
1303 selinux_netlbl_cache_invalidate();
1304 selinux_xfrm_notify_policyload();
1309 sidtab_hash_eval(&sidtab
, "sids");
1312 if (policydb_read(&newpolicydb
, fp
)) {
1317 sidtab_init(&newsidtab
);
1319 /* Verify that the kernel defined classes are correct. */
1320 if (validate_classes(&newpolicydb
)) {
1322 "security: the definition of a class is incorrect\n");
1327 /* Clone the SID table. */
1328 sidtab_shutdown(&sidtab
);
1329 if (sidtab_map(&sidtab
, clone_sid
, &newsidtab
)) {
1334 /* Convert the internal representations of contexts
1335 in the new SID table and remove invalid SIDs. */
1336 args
.oldp
= &policydb
;
1337 args
.newp
= &newpolicydb
;
1338 sidtab_map_remove_on_error(&newsidtab
, convert_context
, &args
);
1340 /* Save the old policydb and SID table to free later. */
1341 memcpy(&oldpolicydb
, &policydb
, sizeof policydb
);
1342 sidtab_set(&oldsidtab
, &sidtab
);
1344 /* Install the new policydb and SID table. */
1346 memcpy(&policydb
, &newpolicydb
, sizeof policydb
);
1347 sidtab_set(&sidtab
, &newsidtab
);
1348 seqno
= ++latest_granting
;
1349 policydb_loaded_version
= policydb
.policyvers
;
1353 /* Free the old policydb and SID table. */
1354 policydb_destroy(&oldpolicydb
);
1355 sidtab_destroy(&oldsidtab
);
1357 avc_ss_reset(seqno
);
1358 selnl_notify_policyload(seqno
);
1359 selinux_netlbl_cache_invalidate();
1360 selinux_xfrm_notify_policyload();
1366 sidtab_destroy(&newsidtab
);
1367 policydb_destroy(&newpolicydb
);
1373 * security_port_sid - Obtain the SID for a port.
1374 * @domain: communication domain aka address family
1375 * @type: socket type
1376 * @protocol: protocol number
1377 * @port: port number
1378 * @out_sid: security identifier
1380 int security_port_sid(u16 domain
,
1391 c
= policydb
.ocontexts
[OCON_PORT
];
1393 if (c
->u
.port
.protocol
== protocol
&&
1394 c
->u
.port
.low_port
<= port
&&
1395 c
->u
.port
.high_port
>= port
)
1402 rc
= sidtab_context_to_sid(&sidtab
,
1408 *out_sid
= c
->sid
[0];
1410 *out_sid
= SECINITSID_PORT
;
1419 * security_netif_sid - Obtain the SID for a network interface.
1420 * @name: interface name
1421 * @if_sid: interface SID
1422 * @msg_sid: default SID for received packets
1424 int security_netif_sid(char *name
,
1433 c
= policydb
.ocontexts
[OCON_NETIF
];
1435 if (strcmp(name
, c
->u
.name
) == 0)
1441 if (!c
->sid
[0] || !c
->sid
[1]) {
1442 rc
= sidtab_context_to_sid(&sidtab
,
1447 rc
= sidtab_context_to_sid(&sidtab
,
1453 *if_sid
= c
->sid
[0];
1454 *msg_sid
= c
->sid
[1];
1456 *if_sid
= SECINITSID_NETIF
;
1457 *msg_sid
= SECINITSID_NETMSG
;
1465 static int match_ipv6_addrmask(u32
*input
, u32
*addr
, u32
*mask
)
1469 for(i
= 0; i
< 4; i
++)
1470 if(addr
[i
] != (input
[i
] & mask
[i
])) {
1479 * security_node_sid - Obtain the SID for a node (host).
1480 * @domain: communication domain aka address family
1482 * @addrlen: address length in bytes
1483 * @out_sid: security identifier
1485 int security_node_sid(u16 domain
,
1499 if (addrlen
!= sizeof(u32
)) {
1504 addr
= *((u32
*)addrp
);
1506 c
= policydb
.ocontexts
[OCON_NODE
];
1508 if (c
->u
.node
.addr
== (addr
& c
->u
.node
.mask
))
1516 if (addrlen
!= sizeof(u64
) * 2) {
1520 c
= policydb
.ocontexts
[OCON_NODE6
];
1522 if (match_ipv6_addrmask(addrp
, c
->u
.node6
.addr
,
1530 *out_sid
= SECINITSID_NODE
;
1536 rc
= sidtab_context_to_sid(&sidtab
,
1542 *out_sid
= c
->sid
[0];
1544 *out_sid
= SECINITSID_NODE
;
1555 * security_get_user_sids - Obtain reachable SIDs for a user.
1556 * @fromsid: starting SID
1557 * @username: username
1558 * @sids: array of reachable SIDs for user
1559 * @nel: number of elements in @sids
1561 * Generate the set of SIDs for legal security contexts
1562 * for a given user that can be reached by @fromsid.
1563 * Set *@sids to point to a dynamically allocated
1564 * array containing the set of SIDs. Set *@nel to the
1565 * number of elements in the array.
1568 int security_get_user_sids(u32 fromsid
,
1573 struct context
*fromcon
, usercon
;
1574 u32
*mysids
, *mysids2
, sid
;
1575 u32 mynel
= 0, maxnel
= SIDS_NEL
;
1576 struct user_datum
*user
;
1577 struct role_datum
*role
;
1578 struct av_decision avd
;
1579 struct ebitmap_node
*rnode
, *tnode
;
1582 if (!ss_initialized
) {
1590 fromcon
= sidtab_search(&sidtab
, fromsid
);
1596 user
= hashtab_search(policydb
.p_users
.table
, username
);
1601 usercon
.user
= user
->value
;
1603 mysids
= kcalloc(maxnel
, sizeof(*mysids
), GFP_ATOMIC
);
1609 ebitmap_for_each_bit(&user
->roles
, rnode
, i
) {
1610 if (!ebitmap_node_get_bit(rnode
, i
))
1612 role
= policydb
.role_val_to_struct
[i
];
1614 ebitmap_for_each_bit(&role
->types
, tnode
, j
) {
1615 if (!ebitmap_node_get_bit(tnode
, j
))
1619 if (mls_setup_user_range(fromcon
, user
, &usercon
))
1622 rc
= context_struct_compute_av(fromcon
, &usercon
,
1624 PROCESS__TRANSITION
,
1626 if (rc
|| !(avd
.allowed
& PROCESS__TRANSITION
))
1628 rc
= sidtab_context_to_sid(&sidtab
, &usercon
, &sid
);
1633 if (mynel
< maxnel
) {
1634 mysids
[mynel
++] = sid
;
1637 mysids2
= kcalloc(maxnel
, sizeof(*mysids2
), GFP_ATOMIC
);
1643 memcpy(mysids2
, mysids
, mynel
* sizeof(*mysids2
));
1646 mysids
[mynel
++] = sid
;
1661 * security_genfs_sid - Obtain a SID for a file in a filesystem
1662 * @fstype: filesystem type
1663 * @path: path from root of mount
1664 * @sclass: file security class
1665 * @sid: SID for path
1667 * Obtain a SID to use for a file in a filesystem that
1668 * cannot support xattr or use a fixed labeling behavior like
1669 * transition SIDs or task SIDs.
1671 int security_genfs_sid(const char *fstype
,
1677 struct genfs
*genfs
;
1679 int rc
= 0, cmp
= 0;
1683 for (genfs
= policydb
.genfs
; genfs
; genfs
= genfs
->next
) {
1684 cmp
= strcmp(fstype
, genfs
->fstype
);
1689 if (!genfs
|| cmp
) {
1690 *sid
= SECINITSID_UNLABELED
;
1695 for (c
= genfs
->head
; c
; c
= c
->next
) {
1696 len
= strlen(c
->u
.name
);
1697 if ((!c
->v
.sclass
|| sclass
== c
->v
.sclass
) &&
1698 (strncmp(c
->u
.name
, path
, len
) == 0))
1703 *sid
= SECINITSID_UNLABELED
;
1709 rc
= sidtab_context_to_sid(&sidtab
,
1723 * security_fs_use - Determine how to handle labeling for a filesystem.
1724 * @fstype: filesystem type
1725 * @behavior: labeling behavior
1726 * @sid: SID for filesystem (superblock)
1728 int security_fs_use(
1730 unsigned int *behavior
,
1738 c
= policydb
.ocontexts
[OCON_FSUSE
];
1740 if (strcmp(fstype
, c
->u
.name
) == 0)
1746 *behavior
= c
->v
.behavior
;
1748 rc
= sidtab_context_to_sid(&sidtab
,
1756 rc
= security_genfs_sid(fstype
, "/", SECCLASS_DIR
, sid
);
1758 *behavior
= SECURITY_FS_USE_NONE
;
1761 *behavior
= SECURITY_FS_USE_GENFS
;
1770 int security_get_bools(int *len
, char ***names
, int **values
)
1772 int i
, rc
= -ENOMEM
;
1778 *len
= policydb
.p_bools
.nprim
;
1784 *names
= kcalloc(*len
, sizeof(char*), GFP_ATOMIC
);
1788 *values
= kcalloc(*len
, sizeof(int), GFP_ATOMIC
);
1792 for (i
= 0; i
< *len
; i
++) {
1794 (*values
)[i
] = policydb
.bool_val_to_struct
[i
]->state
;
1795 name_len
= strlen(policydb
.p_bool_val_to_name
[i
]) + 1;
1796 (*names
)[i
] = kmalloc(sizeof(char) * name_len
, GFP_ATOMIC
);
1799 strncpy((*names
)[i
], policydb
.p_bool_val_to_name
[i
], name_len
);
1800 (*names
)[i
][name_len
- 1] = 0;
1808 for (i
= 0; i
< *len
; i
++)
1816 int security_set_bools(int len
, int *values
)
1819 int lenp
, seqno
= 0;
1820 struct cond_node
*cur
;
1824 lenp
= policydb
.p_bools
.nprim
;
1830 for (i
= 0; i
< len
; i
++) {
1831 if (!!values
[i
] != policydb
.bool_val_to_struct
[i
]->state
) {
1832 audit_log(current
->audit_context
, GFP_ATOMIC
,
1833 AUDIT_MAC_CONFIG_CHANGE
,
1834 "bool=%s val=%d old_val=%d auid=%u",
1835 policydb
.p_bool_val_to_name
[i
],
1837 policydb
.bool_val_to_struct
[i
]->state
,
1838 audit_get_loginuid(current
->audit_context
));
1841 policydb
.bool_val_to_struct
[i
]->state
= 1;
1843 policydb
.bool_val_to_struct
[i
]->state
= 0;
1847 for (cur
= policydb
.cond_list
; cur
!= NULL
; cur
= cur
->next
) {
1848 rc
= evaluate_cond_node(&policydb
, cur
);
1853 seqno
= ++latest_granting
;
1858 avc_ss_reset(seqno
);
1859 selnl_notify_policyload(seqno
);
1860 selinux_xfrm_notify_policyload();
1865 int security_get_bool_value(int bool)
1872 len
= policydb
.p_bools
.nprim
;
1878 rc
= policydb
.bool_val_to_struct
[bool]->state
;
1885 * security_sid_mls_copy() - computes a new sid based on the given
1886 * sid and the mls portion of mls_sid.
1888 int security_sid_mls_copy(u32 sid
, u32 mls_sid
, u32
*new_sid
)
1890 struct context
*context1
;
1891 struct context
*context2
;
1892 struct context newcon
;
1897 if (!ss_initialized
|| !selinux_mls_enabled
) {
1902 context_init(&newcon
);
1905 context1
= sidtab_search(&sidtab
, sid
);
1907 printk(KERN_ERR
"security_sid_mls_copy: unrecognized SID "
1913 context2
= sidtab_search(&sidtab
, mls_sid
);
1915 printk(KERN_ERR
"security_sid_mls_copy: unrecognized SID "
1921 newcon
.user
= context1
->user
;
1922 newcon
.role
= context1
->role
;
1923 newcon
.type
= context1
->type
;
1924 rc
= mls_context_cpy(&newcon
, context2
);
1928 /* Check the validity of the new context. */
1929 if (!policydb_context_isvalid(&policydb
, &newcon
)) {
1930 rc
= convert_context_handle_invalid_context(&newcon
);
1935 rc
= sidtab_context_to_sid(&sidtab
, &newcon
, new_sid
);
1939 if (!context_struct_to_string(&newcon
, &s
, &len
)) {
1940 audit_log(current
->audit_context
, GFP_ATOMIC
, AUDIT_SELINUX_ERR
,
1941 "security_sid_mls_copy: invalid context %s", s
);
1947 context_destroy(&newcon
);
1952 struct selinux_audit_rule
{
1954 struct context au_ctxt
;
1957 void selinux_audit_rule_free(struct selinux_audit_rule
*rule
)
1960 context_destroy(&rule
->au_ctxt
);
1965 int selinux_audit_rule_init(u32 field
, u32 op
, char *rulestr
,
1966 struct selinux_audit_rule
**rule
)
1968 struct selinux_audit_rule
*tmprule
;
1969 struct role_datum
*roledatum
;
1970 struct type_datum
*typedatum
;
1971 struct user_datum
*userdatum
;
1976 if (!ss_initialized
)
1980 case AUDIT_SUBJ_USER
:
1981 case AUDIT_SUBJ_ROLE
:
1982 case AUDIT_SUBJ_TYPE
:
1983 case AUDIT_OBJ_USER
:
1984 case AUDIT_OBJ_ROLE
:
1985 case AUDIT_OBJ_TYPE
:
1986 /* only 'equals' and 'not equals' fit user, role, and type */
1987 if (op
!= AUDIT_EQUAL
&& op
!= AUDIT_NOT_EQUAL
)
1990 case AUDIT_SUBJ_SEN
:
1991 case AUDIT_SUBJ_CLR
:
1992 case AUDIT_OBJ_LEV_LOW
:
1993 case AUDIT_OBJ_LEV_HIGH
:
1994 /* we do not allow a range, indicated by the presense of '-' */
1995 if (strchr(rulestr
, '-'))
1999 /* only the above fields are valid */
2003 tmprule
= kzalloc(sizeof(struct selinux_audit_rule
), GFP_KERNEL
);
2007 context_init(&tmprule
->au_ctxt
);
2011 tmprule
->au_seqno
= latest_granting
;
2014 case AUDIT_SUBJ_USER
:
2015 case AUDIT_OBJ_USER
:
2016 userdatum
= hashtab_search(policydb
.p_users
.table
, rulestr
);
2020 tmprule
->au_ctxt
.user
= userdatum
->value
;
2022 case AUDIT_SUBJ_ROLE
:
2023 case AUDIT_OBJ_ROLE
:
2024 roledatum
= hashtab_search(policydb
.p_roles
.table
, rulestr
);
2028 tmprule
->au_ctxt
.role
= roledatum
->value
;
2030 case AUDIT_SUBJ_TYPE
:
2031 case AUDIT_OBJ_TYPE
:
2032 typedatum
= hashtab_search(policydb
.p_types
.table
, rulestr
);
2036 tmprule
->au_ctxt
.type
= typedatum
->value
;
2038 case AUDIT_SUBJ_SEN
:
2039 case AUDIT_SUBJ_CLR
:
2040 case AUDIT_OBJ_LEV_LOW
:
2041 case AUDIT_OBJ_LEV_HIGH
:
2042 rc
= mls_from_string(rulestr
, &tmprule
->au_ctxt
, GFP_ATOMIC
);
2049 selinux_audit_rule_free(tmprule
);
2058 int selinux_audit_rule_match(u32 sid
, u32 field
, u32 op
,
2059 struct selinux_audit_rule
*rule
,
2060 struct audit_context
*actx
)
2062 struct context
*ctxt
;
2063 struct mls_level
*level
;
2067 audit_log(actx
, GFP_ATOMIC
, AUDIT_SELINUX_ERR
,
2068 "selinux_audit_rule_match: missing rule\n");
2074 if (rule
->au_seqno
< latest_granting
) {
2075 audit_log(actx
, GFP_ATOMIC
, AUDIT_SELINUX_ERR
,
2076 "selinux_audit_rule_match: stale rule\n");
2081 ctxt
= sidtab_search(&sidtab
, sid
);
2083 audit_log(actx
, GFP_ATOMIC
, AUDIT_SELINUX_ERR
,
2084 "selinux_audit_rule_match: unrecognized SID %d\n",
2090 /* a field/op pair that is not caught here will simply fall through
2093 case AUDIT_SUBJ_USER
:
2094 case AUDIT_OBJ_USER
:
2097 match
= (ctxt
->user
== rule
->au_ctxt
.user
);
2099 case AUDIT_NOT_EQUAL
:
2100 match
= (ctxt
->user
!= rule
->au_ctxt
.user
);
2104 case AUDIT_SUBJ_ROLE
:
2105 case AUDIT_OBJ_ROLE
:
2108 match
= (ctxt
->role
== rule
->au_ctxt
.role
);
2110 case AUDIT_NOT_EQUAL
:
2111 match
= (ctxt
->role
!= rule
->au_ctxt
.role
);
2115 case AUDIT_SUBJ_TYPE
:
2116 case AUDIT_OBJ_TYPE
:
2119 match
= (ctxt
->type
== rule
->au_ctxt
.type
);
2121 case AUDIT_NOT_EQUAL
:
2122 match
= (ctxt
->type
!= rule
->au_ctxt
.type
);
2126 case AUDIT_SUBJ_SEN
:
2127 case AUDIT_SUBJ_CLR
:
2128 case AUDIT_OBJ_LEV_LOW
:
2129 case AUDIT_OBJ_LEV_HIGH
:
2130 level
= ((field
== AUDIT_SUBJ_SEN
||
2131 field
== AUDIT_OBJ_LEV_LOW
) ?
2132 &ctxt
->range
.level
[0] : &ctxt
->range
.level
[1]);
2135 match
= mls_level_eq(&rule
->au_ctxt
.range
.level
[0],
2138 case AUDIT_NOT_EQUAL
:
2139 match
= !mls_level_eq(&rule
->au_ctxt
.range
.level
[0],
2142 case AUDIT_LESS_THAN
:
2143 match
= (mls_level_dom(&rule
->au_ctxt
.range
.level
[0],
2145 !mls_level_eq(&rule
->au_ctxt
.range
.level
[0],
2148 case AUDIT_LESS_THAN_OR_EQUAL
:
2149 match
= mls_level_dom(&rule
->au_ctxt
.range
.level
[0],
2152 case AUDIT_GREATER_THAN
:
2153 match
= (mls_level_dom(level
,
2154 &rule
->au_ctxt
.range
.level
[0]) &&
2155 !mls_level_eq(level
,
2156 &rule
->au_ctxt
.range
.level
[0]));
2158 case AUDIT_GREATER_THAN_OR_EQUAL
:
2159 match
= mls_level_dom(level
,
2160 &rule
->au_ctxt
.range
.level
[0]);
2170 static int (*aurule_callback
)(void) = NULL
;
2172 static int aurule_avc_callback(u32 event
, u32 ssid
, u32 tsid
,
2173 u16
class, u32 perms
, u32
*retained
)
2177 if (event
== AVC_CALLBACK_RESET
&& aurule_callback
)
2178 err
= aurule_callback();
2182 static int __init
aurule_init(void)
2186 err
= avc_add_callback(aurule_avc_callback
, AVC_CALLBACK_RESET
,
2187 SECSID_NULL
, SECSID_NULL
, SECCLASS_NULL
, 0);
2189 panic("avc_add_callback() failed, error %d\n", err
);
2193 __initcall(aurule_init
);
2195 void selinux_audit_set_callback(int (*callback
)(void))
2197 aurule_callback
= callback
;
2200 #ifdef CONFIG_NETLABEL
2202 * NetLabel cache structure
2204 #define NETLBL_CACHE(x) ((struct selinux_netlbl_cache *)(x))
2205 #define NETLBL_CACHE_T_NONE 0
2206 #define NETLBL_CACHE_T_SID 1
2207 #define NETLBL_CACHE_T_MLS 2
2208 struct selinux_netlbl_cache
{
2212 struct mls_range mls_label
;
2217 * security_netlbl_cache_free - Free the NetLabel cached data
2218 * @data: the data to free
2221 * This function is intended to be used as the free() callback inside the
2222 * netlbl_lsm_cache structure.
2225 static void security_netlbl_cache_free(const void *data
)
2227 struct selinux_netlbl_cache
*cache
;
2232 cache
= NETLBL_CACHE(data
);
2233 switch (cache
->type
) {
2234 case NETLBL_CACHE_T_MLS
:
2235 ebitmap_destroy(&cache
->data
.mls_label
.level
[0].cat
);
2242 * security_netlbl_cache_add - Add an entry to the NetLabel cache
2243 * @secattr: the NetLabel packet security attributes
2244 * @ctx: the SELinux context
2247 * Attempt to cache the context in @ctx, which was derived from the packet in
2248 * @skb, in the NetLabel subsystem cache. This function assumes @secattr has
2249 * already been initialized.
2252 static void security_netlbl_cache_add(struct netlbl_lsm_secattr
*secattr
,
2253 struct context
*ctx
)
2255 struct selinux_netlbl_cache
*cache
= NULL
;
2257 secattr
->cache
= netlbl_secattr_cache_alloc(GFP_ATOMIC
);
2258 if (secattr
->cache
== NULL
)
2261 cache
= kzalloc(sizeof(*cache
), GFP_ATOMIC
);
2265 cache
->type
= NETLBL_CACHE_T_MLS
;
2266 if (ebitmap_cpy(&cache
->data
.mls_label
.level
[0].cat
,
2267 &ctx
->range
.level
[0].cat
) != 0)
2269 cache
->data
.mls_label
.level
[1].cat
.highbit
=
2270 cache
->data
.mls_label
.level
[0].cat
.highbit
;
2271 cache
->data
.mls_label
.level
[1].cat
.node
=
2272 cache
->data
.mls_label
.level
[0].cat
.node
;
2273 cache
->data
.mls_label
.level
[0].sens
= ctx
->range
.level
[0].sens
;
2274 cache
->data
.mls_label
.level
[1].sens
= ctx
->range
.level
[0].sens
;
2276 secattr
->cache
->free
= security_netlbl_cache_free
;
2277 secattr
->cache
->data
= (void *)cache
;
2278 secattr
->flags
|= NETLBL_SECATTR_CACHE
;
2282 * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID
2283 * @secattr: the NetLabel packet security attributes
2284 * @base_sid: the SELinux SID to use as a context for MLS only attributes
2285 * @sid: the SELinux SID
2288 * Convert the given NetLabel security attributes in @secattr into a
2289 * SELinux SID. If the @secattr field does not contain a full SELinux
2290 * SID/context then use the context in @base_sid as the foundation. If
2291 * possibile the 'cache' field of @secattr is set and the CACHE flag is set;
2292 * this is to allow the @secattr to be used by NetLabel to cache the secattr to
2293 * SID conversion for future lookups. Returns zero on success, negative
2294 * values on failure.
2297 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr
*secattr
,
2302 struct context
*ctx
;
2303 struct context ctx_new
;
2304 struct selinux_netlbl_cache
*cache
;
2306 if (!ss_initialized
) {
2313 if (secattr
->flags
& NETLBL_SECATTR_CACHE
) {
2314 cache
= NETLBL_CACHE(secattr
->cache
->data
);
2315 switch (cache
->type
) {
2316 case NETLBL_CACHE_T_SID
:
2317 *sid
= cache
->data
.sid
;
2320 case NETLBL_CACHE_T_MLS
:
2321 ctx
= sidtab_search(&sidtab
, base_sid
);
2323 goto netlbl_secattr_to_sid_return
;
2325 ctx_new
.user
= ctx
->user
;
2326 ctx_new
.role
= ctx
->role
;
2327 ctx_new
.type
= ctx
->type
;
2328 ctx_new
.range
.level
[0].sens
=
2329 cache
->data
.mls_label
.level
[0].sens
;
2330 ctx_new
.range
.level
[0].cat
.highbit
=
2331 cache
->data
.mls_label
.level
[0].cat
.highbit
;
2332 ctx_new
.range
.level
[0].cat
.node
=
2333 cache
->data
.mls_label
.level
[0].cat
.node
;
2334 ctx_new
.range
.level
[1].sens
=
2335 cache
->data
.mls_label
.level
[1].sens
;
2336 ctx_new
.range
.level
[1].cat
.highbit
=
2337 cache
->data
.mls_label
.level
[1].cat
.highbit
;
2338 ctx_new
.range
.level
[1].cat
.node
=
2339 cache
->data
.mls_label
.level
[1].cat
.node
;
2341 rc
= sidtab_context_to_sid(&sidtab
, &ctx_new
, sid
);
2344 goto netlbl_secattr_to_sid_return
;
2346 } else if (secattr
->flags
& NETLBL_SECATTR_MLS_LVL
) {
2347 ctx
= sidtab_search(&sidtab
, base_sid
);
2349 goto netlbl_secattr_to_sid_return
;
2351 ctx_new
.user
= ctx
->user
;
2352 ctx_new
.role
= ctx
->role
;
2353 ctx_new
.type
= ctx
->type
;
2354 mls_import_netlbl_lvl(&ctx_new
, secattr
);
2355 if (secattr
->flags
& NETLBL_SECATTR_MLS_CAT
) {
2356 if (ebitmap_netlbl_import(&ctx_new
.range
.level
[0].cat
,
2357 secattr
->mls_cat
) != 0)
2358 goto netlbl_secattr_to_sid_return
;
2359 ctx_new
.range
.level
[1].cat
.highbit
=
2360 ctx_new
.range
.level
[0].cat
.highbit
;
2361 ctx_new
.range
.level
[1].cat
.node
=
2362 ctx_new
.range
.level
[0].cat
.node
;
2364 ebitmap_init(&ctx_new
.range
.level
[0].cat
);
2365 ebitmap_init(&ctx_new
.range
.level
[1].cat
);
2367 if (mls_context_isvalid(&policydb
, &ctx_new
) != 1)
2368 goto netlbl_secattr_to_sid_return_cleanup
;
2370 rc
= sidtab_context_to_sid(&sidtab
, &ctx_new
, sid
);
2372 goto netlbl_secattr_to_sid_return_cleanup
;
2374 security_netlbl_cache_add(secattr
, &ctx_new
);
2376 ebitmap_destroy(&ctx_new
.range
.level
[0].cat
);
2382 netlbl_secattr_to_sid_return
:
2385 netlbl_secattr_to_sid_return_cleanup
:
2386 ebitmap_destroy(&ctx_new
.range
.level
[0].cat
);
2387 goto netlbl_secattr_to_sid_return
;
2391 * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr
2392 * @sid: the SELinux SID
2393 * @secattr: the NetLabel packet security attributes
2396 * Convert the given SELinux SID in @sid into a NetLabel security attribute.
2397 * Returns zero on success, negative values on failure.
2400 int security_netlbl_sid_to_secattr(u32 sid
, struct netlbl_lsm_secattr
*secattr
)
2403 struct context
*ctx
;
2405 netlbl_secattr_init(secattr
);
2407 if (!ss_initialized
)
2411 ctx
= sidtab_search(&sidtab
, sid
);
2413 goto netlbl_sid_to_secattr_failure
;
2414 secattr
->domain
= kstrdup(policydb
.p_type_val_to_name
[ctx
->type
- 1],
2416 secattr
->flags
|= NETLBL_SECATTR_DOMAIN
;
2417 mls_export_netlbl_lvl(ctx
, secattr
);
2418 rc
= mls_export_netlbl_cat(ctx
, secattr
);
2420 goto netlbl_sid_to_secattr_failure
;
2425 netlbl_sid_to_secattr_failure
:
2427 netlbl_secattr_destroy(secattr
);
2430 #endif /* CONFIG_NETLABEL */