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/errno.h>
38 #include <linux/sched.h>
39 #include <linux/audit.h>
40 #include <linux/mutex.h>
42 #include <net/netlabel.h>
52 #include "conditional.h"
55 #include "selinux_netlabel.h"
57 extern void selnl_notify_policyload(u32 seqno
);
58 unsigned int policydb_loaded_version
;
61 * This is declared in avc.c
63 extern const struct selinux_class_perm selinux_class_perm
;
65 static DEFINE_RWLOCK(policy_rwlock
);
66 #define POLICY_RDLOCK read_lock(&policy_rwlock)
67 #define POLICY_WRLOCK write_lock_irq(&policy_rwlock)
68 #define POLICY_RDUNLOCK read_unlock(&policy_rwlock)
69 #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock)
71 static DEFINE_MUTEX(load_mutex
);
72 #define LOAD_LOCK mutex_lock(&load_mutex)
73 #define LOAD_UNLOCK mutex_unlock(&load_mutex)
75 static struct sidtab sidtab
;
76 struct policydb policydb
;
77 int ss_initialized
= 0;
80 * The largest sequence number that has been used when
81 * providing an access decision to the access vector cache.
82 * The sequence number only changes when a policy change
85 static u32 latest_granting
= 0;
87 /* Forward declaration. */
88 static int context_struct_to_string(struct context
*context
, char **scontext
,
92 * Return the boolean value of a constraint expression
93 * when it is applied to the specified source and target
96 * xcontext is a special beast... It is used by the validatetrans rules
97 * only. For these rules, scontext is the context before the transition,
98 * tcontext is the context after the transition, and xcontext is the context
99 * of the process performing the transition. All other callers of
100 * constraint_expr_eval should pass in NULL for xcontext.
102 static int constraint_expr_eval(struct context
*scontext
,
103 struct context
*tcontext
,
104 struct context
*xcontext
,
105 struct constraint_expr
*cexpr
)
109 struct role_datum
*r1
, *r2
;
110 struct mls_level
*l1
, *l2
;
111 struct constraint_expr
*e
;
112 int s
[CEXPR_MAXDEPTH
];
115 for (e
= cexpr
; e
; e
= e
->next
) {
116 switch (e
->expr_type
) {
132 if (sp
== (CEXPR_MAXDEPTH
-1))
136 val1
= scontext
->user
;
137 val2
= tcontext
->user
;
140 val1
= scontext
->type
;
141 val2
= tcontext
->type
;
144 val1
= scontext
->role
;
145 val2
= tcontext
->role
;
146 r1
= policydb
.role_val_to_struct
[val1
- 1];
147 r2
= policydb
.role_val_to_struct
[val2
- 1];
150 s
[++sp
] = ebitmap_get_bit(&r1
->dominates
,
154 s
[++sp
] = ebitmap_get_bit(&r2
->dominates
,
158 s
[++sp
] = ( !ebitmap_get_bit(&r1
->dominates
,
160 !ebitmap_get_bit(&r2
->dominates
,
168 l1
= &(scontext
->range
.level
[0]);
169 l2
= &(tcontext
->range
.level
[0]);
172 l1
= &(scontext
->range
.level
[0]);
173 l2
= &(tcontext
->range
.level
[1]);
176 l1
= &(scontext
->range
.level
[1]);
177 l2
= &(tcontext
->range
.level
[0]);
180 l1
= &(scontext
->range
.level
[1]);
181 l2
= &(tcontext
->range
.level
[1]);
184 l1
= &(scontext
->range
.level
[0]);
185 l2
= &(scontext
->range
.level
[1]);
188 l1
= &(tcontext
->range
.level
[0]);
189 l2
= &(tcontext
->range
.level
[1]);
194 s
[++sp
] = mls_level_eq(l1
, l2
);
197 s
[++sp
] = !mls_level_eq(l1
, l2
);
200 s
[++sp
] = mls_level_dom(l1
, l2
);
203 s
[++sp
] = mls_level_dom(l2
, l1
);
206 s
[++sp
] = mls_level_incomp(l2
, l1
);
220 s
[++sp
] = (val1
== val2
);
223 s
[++sp
] = (val1
!= val2
);
231 if (sp
== (CEXPR_MAXDEPTH
-1))
234 if (e
->attr
& CEXPR_TARGET
)
236 else if (e
->attr
& CEXPR_XTARGET
) {
243 if (e
->attr
& CEXPR_USER
)
245 else if (e
->attr
& CEXPR_ROLE
)
247 else if (e
->attr
& CEXPR_TYPE
)
256 s
[++sp
] = ebitmap_get_bit(&e
->names
, val1
- 1);
259 s
[++sp
] = !ebitmap_get_bit(&e
->names
, val1
- 1);
277 * Compute access vectors based on a context structure pair for
278 * the permissions in a particular class.
280 static int context_struct_compute_av(struct context
*scontext
,
281 struct context
*tcontext
,
284 struct av_decision
*avd
)
286 struct constraint_node
*constraint
;
287 struct role_allow
*ra
;
288 struct avtab_key avkey
;
289 struct avtab_node
*node
;
290 struct class_datum
*tclass_datum
;
291 struct ebitmap
*sattr
, *tattr
;
292 struct ebitmap_node
*snode
, *tnode
;
296 * Remap extended Netlink classes for old policy versions.
297 * Do this here rather than socket_type_to_security_class()
298 * in case a newer policy version is loaded, allowing sockets
299 * to remain in the correct class.
301 if (policydb_loaded_version
< POLICYDB_VERSION_NLCLASS
)
302 if (tclass
>= SECCLASS_NETLINK_ROUTE_SOCKET
&&
303 tclass
<= SECCLASS_NETLINK_DNRT_SOCKET
)
304 tclass
= SECCLASS_NETLINK_SOCKET
;
306 if (!tclass
|| tclass
> policydb
.p_classes
.nprim
) {
307 printk(KERN_ERR
"security_compute_av: unrecognized class %d\n",
311 tclass_datum
= policydb
.class_val_to_struct
[tclass
- 1];
314 * Initialize the access vectors to the default values.
317 avd
->decided
= 0xffffffff;
319 avd
->auditdeny
= 0xffffffff;
320 avd
->seqno
= latest_granting
;
323 * If a specific type enforcement rule was defined for
324 * this permission check, then use it.
326 avkey
.target_class
= tclass
;
327 avkey
.specified
= AVTAB_AV
;
328 sattr
= &policydb
.type_attr_map
[scontext
->type
- 1];
329 tattr
= &policydb
.type_attr_map
[tcontext
->type
- 1];
330 ebitmap_for_each_bit(sattr
, snode
, i
) {
331 if (!ebitmap_node_get_bit(snode
, i
))
333 ebitmap_for_each_bit(tattr
, tnode
, j
) {
334 if (!ebitmap_node_get_bit(tnode
, j
))
336 avkey
.source_type
= i
+ 1;
337 avkey
.target_type
= j
+ 1;
338 for (node
= avtab_search_node(&policydb
.te_avtab
, &avkey
);
340 node
= avtab_search_node_next(node
, avkey
.specified
)) {
341 if (node
->key
.specified
== AVTAB_ALLOWED
)
342 avd
->allowed
|= node
->datum
.data
;
343 else if (node
->key
.specified
== AVTAB_AUDITALLOW
)
344 avd
->auditallow
|= node
->datum
.data
;
345 else if (node
->key
.specified
== AVTAB_AUDITDENY
)
346 avd
->auditdeny
&= node
->datum
.data
;
349 /* Check conditional av table for additional permissions */
350 cond_compute_av(&policydb
.te_cond_avtab
, &avkey
, avd
);
356 * Remove any permissions prohibited by a constraint (this includes
359 constraint
= tclass_datum
->constraints
;
361 if ((constraint
->permissions
& (avd
->allowed
)) &&
362 !constraint_expr_eval(scontext
, tcontext
, NULL
,
364 avd
->allowed
= (avd
->allowed
) & ~(constraint
->permissions
);
366 constraint
= constraint
->next
;
370 * If checking process transition permission and the
371 * role is changing, then check the (current_role, new_role)
374 if (tclass
== SECCLASS_PROCESS
&&
375 (avd
->allowed
& (PROCESS__TRANSITION
| PROCESS__DYNTRANSITION
)) &&
376 scontext
->role
!= tcontext
->role
) {
377 for (ra
= policydb
.role_allow
; ra
; ra
= ra
->next
) {
378 if (scontext
->role
== ra
->role
&&
379 tcontext
->role
== ra
->new_role
)
383 avd
->allowed
= (avd
->allowed
) & ~(PROCESS__TRANSITION
|
384 PROCESS__DYNTRANSITION
);
390 static int security_validtrans_handle_fail(struct context
*ocontext
,
391 struct context
*ncontext
,
392 struct context
*tcontext
,
395 char *o
= NULL
, *n
= NULL
, *t
= NULL
;
396 u32 olen
, nlen
, tlen
;
398 if (context_struct_to_string(ocontext
, &o
, &olen
) < 0)
400 if (context_struct_to_string(ncontext
, &n
, &nlen
) < 0)
402 if (context_struct_to_string(tcontext
, &t
, &tlen
) < 0)
404 audit_log(current
->audit_context
, GFP_ATOMIC
, AUDIT_SELINUX_ERR
,
405 "security_validate_transition: denied for"
406 " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s",
407 o
, n
, t
, policydb
.p_class_val_to_name
[tclass
-1]);
413 if (!selinux_enforcing
)
418 int security_validate_transition(u32 oldsid
, u32 newsid
, u32 tasksid
,
421 struct context
*ocontext
;
422 struct context
*ncontext
;
423 struct context
*tcontext
;
424 struct class_datum
*tclass_datum
;
425 struct constraint_node
*constraint
;
434 * Remap extended Netlink classes for old policy versions.
435 * Do this here rather than socket_type_to_security_class()
436 * in case a newer policy version is loaded, allowing sockets
437 * to remain in the correct class.
439 if (policydb_loaded_version
< POLICYDB_VERSION_NLCLASS
)
440 if (tclass
>= SECCLASS_NETLINK_ROUTE_SOCKET
&&
441 tclass
<= SECCLASS_NETLINK_DNRT_SOCKET
)
442 tclass
= SECCLASS_NETLINK_SOCKET
;
444 if (!tclass
|| tclass
> policydb
.p_classes
.nprim
) {
445 printk(KERN_ERR
"security_validate_transition: "
446 "unrecognized class %d\n", tclass
);
450 tclass_datum
= policydb
.class_val_to_struct
[tclass
- 1];
452 ocontext
= sidtab_search(&sidtab
, oldsid
);
454 printk(KERN_ERR
"security_validate_transition: "
455 " unrecognized SID %d\n", oldsid
);
460 ncontext
= sidtab_search(&sidtab
, newsid
);
462 printk(KERN_ERR
"security_validate_transition: "
463 " unrecognized SID %d\n", newsid
);
468 tcontext
= sidtab_search(&sidtab
, tasksid
);
470 printk(KERN_ERR
"security_validate_transition: "
471 " unrecognized SID %d\n", tasksid
);
476 constraint
= tclass_datum
->validatetrans
;
478 if (!constraint_expr_eval(ocontext
, ncontext
, tcontext
,
480 rc
= security_validtrans_handle_fail(ocontext
, ncontext
,
484 constraint
= constraint
->next
;
493 * security_compute_av - Compute access vector decisions.
494 * @ssid: source security identifier
495 * @tsid: target security identifier
496 * @tclass: target security class
497 * @requested: requested permissions
498 * @avd: access vector decisions
500 * Compute a set of access vector decisions based on the
501 * SID pair (@ssid, @tsid) for the permissions in @tclass.
502 * Return -%EINVAL if any of the parameters are invalid or %0
503 * if the access vector decisions were computed successfully.
505 int security_compute_av(u32 ssid
,
509 struct av_decision
*avd
)
511 struct context
*scontext
= NULL
, *tcontext
= NULL
;
514 if (!ss_initialized
) {
515 avd
->allowed
= 0xffffffff;
516 avd
->decided
= 0xffffffff;
518 avd
->auditdeny
= 0xffffffff;
519 avd
->seqno
= latest_granting
;
525 scontext
= sidtab_search(&sidtab
, ssid
);
527 printk(KERN_ERR
"security_compute_av: unrecognized SID %d\n",
532 tcontext
= sidtab_search(&sidtab
, tsid
);
534 printk(KERN_ERR
"security_compute_av: unrecognized SID %d\n",
540 rc
= context_struct_compute_av(scontext
, tcontext
, tclass
,
548 * Write the security context string representation of
549 * the context structure `context' into a dynamically
550 * allocated string of the correct size. Set `*scontext'
551 * to point to this string and set `*scontext_len' to
552 * the length of the string.
554 static int context_struct_to_string(struct context
*context
, char **scontext
, u32
*scontext_len
)
561 /* Compute the size of the context. */
562 *scontext_len
+= strlen(policydb
.p_user_val_to_name
[context
->user
- 1]) + 1;
563 *scontext_len
+= strlen(policydb
.p_role_val_to_name
[context
->role
- 1]) + 1;
564 *scontext_len
+= strlen(policydb
.p_type_val_to_name
[context
->type
- 1]) + 1;
565 *scontext_len
+= mls_compute_context_len(context
);
567 /* Allocate space for the context; caller must free this space. */
568 scontextp
= kmalloc(*scontext_len
, GFP_ATOMIC
);
572 *scontext
= scontextp
;
575 * Copy the user name, role name and type name into the context.
577 sprintf(scontextp
, "%s:%s:%s",
578 policydb
.p_user_val_to_name
[context
->user
- 1],
579 policydb
.p_role_val_to_name
[context
->role
- 1],
580 policydb
.p_type_val_to_name
[context
->type
- 1]);
581 scontextp
+= strlen(policydb
.p_user_val_to_name
[context
->user
- 1]) +
582 1 + strlen(policydb
.p_role_val_to_name
[context
->role
- 1]) +
583 1 + strlen(policydb
.p_type_val_to_name
[context
->type
- 1]);
585 mls_sid_to_context(context
, &scontextp
);
592 #include "initial_sid_to_string.h"
595 * security_sid_to_context - Obtain a context for a given SID.
596 * @sid: security identifier, SID
597 * @scontext: security context
598 * @scontext_len: length in bytes
600 * Write the string representation of the context associated with @sid
601 * into a dynamically allocated string of the correct size. Set @scontext
602 * to point to this string and set @scontext_len to the length of the string.
604 int security_sid_to_context(u32 sid
, char **scontext
, u32
*scontext_len
)
606 struct context
*context
;
609 if (!ss_initialized
) {
610 if (sid
<= SECINITSID_NUM
) {
613 *scontext_len
= strlen(initial_sid_to_string
[sid
]) + 1;
614 scontextp
= kmalloc(*scontext_len
,GFP_ATOMIC
);
619 strcpy(scontextp
, initial_sid_to_string
[sid
]);
620 *scontext
= scontextp
;
623 printk(KERN_ERR
"security_sid_to_context: called before initial "
624 "load_policy on unknown SID %d\n", sid
);
629 context
= sidtab_search(&sidtab
, sid
);
631 printk(KERN_ERR
"security_sid_to_context: unrecognized SID "
636 rc
= context_struct_to_string(context
, scontext
, scontext_len
);
644 static int security_context_to_sid_core(char *scontext
, u32 scontext_len
, u32
*sid
, u32 def_sid
)
647 struct context context
;
648 struct role_datum
*role
;
649 struct type_datum
*typdatum
;
650 struct user_datum
*usrdatum
;
651 char *scontextp
, *p
, oldc
;
654 if (!ss_initialized
) {
657 for (i
= 1; i
< SECINITSID_NUM
; i
++) {
658 if (!strcmp(initial_sid_to_string
[i
], scontext
)) {
663 *sid
= SECINITSID_KERNEL
;
668 /* Copy the string so that we can modify the copy as we parse it.
669 The string should already by null terminated, but we append a
670 null suffix to the copy to avoid problems with the existing
671 attr package, which doesn't view the null terminator as part
672 of the attribute value. */
673 scontext2
= kmalloc(scontext_len
+1,GFP_KERNEL
);
678 memcpy(scontext2
, scontext
, scontext_len
);
679 scontext2
[scontext_len
] = 0;
681 context_init(&context
);
686 /* Parse the security context. */
689 scontextp
= (char *) scontext2
;
691 /* Extract the user. */
693 while (*p
&& *p
!= ':')
701 usrdatum
= hashtab_search(policydb
.p_users
.table
, scontextp
);
705 context
.user
= usrdatum
->value
;
709 while (*p
&& *p
!= ':')
717 role
= hashtab_search(policydb
.p_roles
.table
, scontextp
);
720 context
.role
= role
->value
;
724 while (*p
&& *p
!= ':')
729 typdatum
= hashtab_search(policydb
.p_types
.table
, scontextp
);
733 context
.type
= typdatum
->value
;
735 rc
= mls_context_to_sid(oldc
, &p
, &context
, &sidtab
, def_sid
);
739 if ((p
- scontext2
) < scontext_len
) {
744 /* Check the validity of the new context. */
745 if (!policydb_context_isvalid(&policydb
, &context
)) {
749 /* Obtain the new sid. */
750 rc
= sidtab_context_to_sid(&sidtab
, &context
, sid
);
753 context_destroy(&context
);
760 * security_context_to_sid - Obtain a SID for a given security context.
761 * @scontext: security context
762 * @scontext_len: length in bytes
763 * @sid: security identifier, SID
765 * Obtains a SID associated with the security context that
766 * has the string representation specified by @scontext.
767 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
768 * memory is available, or 0 on success.
770 int security_context_to_sid(char *scontext
, u32 scontext_len
, u32
*sid
)
772 return security_context_to_sid_core(scontext
, scontext_len
,
777 * security_context_to_sid_default - Obtain a SID for a given security context,
778 * falling back to specified default if needed.
780 * @scontext: security context
781 * @scontext_len: length in bytes
782 * @sid: security identifier, SID
783 * @def_sid: default SID to assign on errror
785 * Obtains a SID associated with the security context that
786 * has the string representation specified by @scontext.
787 * The default SID is passed to the MLS layer to be used to allow
788 * kernel labeling of the MLS field if the MLS field is not present
789 * (for upgrading to MLS without full relabel).
790 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
791 * memory is available, or 0 on success.
793 int security_context_to_sid_default(char *scontext
, u32 scontext_len
, u32
*sid
, u32 def_sid
)
795 return security_context_to_sid_core(scontext
, scontext_len
,
799 static int compute_sid_handle_invalid_context(
800 struct context
*scontext
,
801 struct context
*tcontext
,
803 struct context
*newcontext
)
805 char *s
= NULL
, *t
= NULL
, *n
= NULL
;
806 u32 slen
, tlen
, nlen
;
808 if (context_struct_to_string(scontext
, &s
, &slen
) < 0)
810 if (context_struct_to_string(tcontext
, &t
, &tlen
) < 0)
812 if (context_struct_to_string(newcontext
, &n
, &nlen
) < 0)
814 audit_log(current
->audit_context
, GFP_ATOMIC
, AUDIT_SELINUX_ERR
,
815 "security_compute_sid: invalid context %s"
819 n
, s
, t
, policydb
.p_class_val_to_name
[tclass
-1]);
824 if (!selinux_enforcing
)
829 static int security_compute_sid(u32 ssid
,
835 struct context
*scontext
= NULL
, *tcontext
= NULL
, newcontext
;
836 struct role_trans
*roletr
= NULL
;
837 struct avtab_key avkey
;
838 struct avtab_datum
*avdatum
;
839 struct avtab_node
*node
;
842 if (!ss_initialized
) {
844 case SECCLASS_PROCESS
:
854 context_init(&newcontext
);
858 scontext
= sidtab_search(&sidtab
, ssid
);
860 printk(KERN_ERR
"security_compute_sid: unrecognized SID %d\n",
865 tcontext
= sidtab_search(&sidtab
, tsid
);
867 printk(KERN_ERR
"security_compute_sid: unrecognized SID %d\n",
873 /* Set the user identity. */
875 case AVTAB_TRANSITION
:
877 /* Use the process user identity. */
878 newcontext
.user
= scontext
->user
;
881 /* Use the related object owner. */
882 newcontext
.user
= tcontext
->user
;
886 /* Set the role and type to default values. */
888 case SECCLASS_PROCESS
:
889 /* Use the current role and type of process. */
890 newcontext
.role
= scontext
->role
;
891 newcontext
.type
= scontext
->type
;
894 /* Use the well-defined object role. */
895 newcontext
.role
= OBJECT_R_VAL
;
896 /* Use the type of the related object. */
897 newcontext
.type
= tcontext
->type
;
900 /* Look for a type transition/member/change rule. */
901 avkey
.source_type
= scontext
->type
;
902 avkey
.target_type
= tcontext
->type
;
903 avkey
.target_class
= tclass
;
904 avkey
.specified
= specified
;
905 avdatum
= avtab_search(&policydb
.te_avtab
, &avkey
);
907 /* If no permanent rule, also check for enabled conditional rules */
909 node
= avtab_search_node(&policydb
.te_cond_avtab
, &avkey
);
910 for (; node
!= NULL
; node
= avtab_search_node_next(node
, specified
)) {
911 if (node
->key
.specified
& AVTAB_ENABLED
) {
912 avdatum
= &node
->datum
;
919 /* Use the type from the type transition/member/change rule. */
920 newcontext
.type
= avdatum
->data
;
923 /* Check for class-specific changes. */
925 case SECCLASS_PROCESS
:
926 if (specified
& AVTAB_TRANSITION
) {
927 /* Look for a role transition rule. */
928 for (roletr
= policydb
.role_tr
; roletr
;
929 roletr
= roletr
->next
) {
930 if (roletr
->role
== scontext
->role
&&
931 roletr
->type
== tcontext
->type
) {
932 /* Use the role transition rule. */
933 newcontext
.role
= roletr
->new_role
;
943 /* Set the MLS attributes.
944 This is done last because it may allocate memory. */
945 rc
= mls_compute_sid(scontext
, tcontext
, tclass
, specified
, &newcontext
);
949 /* Check the validity of the context. */
950 if (!policydb_context_isvalid(&policydb
, &newcontext
)) {
951 rc
= compute_sid_handle_invalid_context(scontext
,
958 /* Obtain the sid for the context. */
959 rc
= sidtab_context_to_sid(&sidtab
, &newcontext
, out_sid
);
962 context_destroy(&newcontext
);
968 * security_transition_sid - Compute the SID for a new subject/object.
969 * @ssid: source security identifier
970 * @tsid: target security identifier
971 * @tclass: target security class
972 * @out_sid: security identifier for new subject/object
974 * Compute a SID to use for labeling a new subject or object in the
975 * class @tclass based on a SID pair (@ssid, @tsid).
976 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
977 * if insufficient memory is available, or %0 if the new SID was
978 * computed successfully.
980 int security_transition_sid(u32 ssid
,
985 return security_compute_sid(ssid
, tsid
, tclass
, AVTAB_TRANSITION
, out_sid
);
989 * security_member_sid - Compute the SID for member selection.
990 * @ssid: source security identifier
991 * @tsid: target security identifier
992 * @tclass: target security class
993 * @out_sid: security identifier for selected member
995 * Compute a SID to use when selecting a member of a polyinstantiated
996 * object of class @tclass based on a SID pair (@ssid, @tsid).
997 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
998 * if insufficient memory is available, or %0 if the SID was
999 * computed successfully.
1001 int security_member_sid(u32 ssid
,
1006 return security_compute_sid(ssid
, tsid
, tclass
, AVTAB_MEMBER
, out_sid
);
1010 * security_change_sid - Compute the SID for object relabeling.
1011 * @ssid: source security identifier
1012 * @tsid: target security identifier
1013 * @tclass: target security class
1014 * @out_sid: security identifier for selected member
1016 * Compute a SID to use for relabeling an object of class @tclass
1017 * 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 SID was
1020 * computed successfully.
1022 int security_change_sid(u32 ssid
,
1027 return security_compute_sid(ssid
, tsid
, tclass
, AVTAB_CHANGE
, out_sid
);
1031 * Verify that each kernel class that is defined in the
1034 static int validate_classes(struct policydb
*p
)
1037 struct class_datum
*cladatum
;
1038 struct perm_datum
*perdatum
;
1039 u32 nprim
, tmp
, common_pts_len
, perm_val
, pol_val
;
1041 const struct selinux_class_perm
*kdefs
= &selinux_class_perm
;
1042 const char *def_class
, *def_perm
, *pol_class
;
1043 struct symtab
*perms
;
1045 for (i
= 1; i
< kdefs
->cts_len
; i
++) {
1046 def_class
= kdefs
->class_to_string
[i
];
1047 if (i
> p
->p_classes
.nprim
) {
1049 "security: class %s not defined in policy\n",
1053 pol_class
= p
->p_class_val_to_name
[i
-1];
1054 if (strcmp(pol_class
, def_class
)) {
1056 "security: class %d is incorrect, found %s but should be %s\n",
1057 i
, pol_class
, def_class
);
1061 for (i
= 0; i
< kdefs
->av_pts_len
; i
++) {
1062 class_val
= kdefs
->av_perm_to_string
[i
].tclass
;
1063 perm_val
= kdefs
->av_perm_to_string
[i
].value
;
1064 def_perm
= kdefs
->av_perm_to_string
[i
].name
;
1065 if (class_val
> p
->p_classes
.nprim
)
1067 pol_class
= p
->p_class_val_to_name
[class_val
-1];
1068 cladatum
= hashtab_search(p
->p_classes
.table
, pol_class
);
1070 perms
= &cladatum
->permissions
;
1071 nprim
= 1 << (perms
->nprim
- 1);
1072 if (perm_val
> nprim
) {
1074 "security: permission %s in class %s not defined in policy\n",
1075 def_perm
, pol_class
);
1078 perdatum
= hashtab_search(perms
->table
, def_perm
);
1079 if (perdatum
== NULL
) {
1081 "security: permission %s in class %s not found in policy\n",
1082 def_perm
, pol_class
);
1085 pol_val
= 1 << (perdatum
->value
- 1);
1086 if (pol_val
!= perm_val
) {
1088 "security: permission %s in class %s has incorrect value\n",
1089 def_perm
, pol_class
);
1093 for (i
= 0; i
< kdefs
->av_inherit_len
; i
++) {
1094 class_val
= kdefs
->av_inherit
[i
].tclass
;
1095 if (class_val
> p
->p_classes
.nprim
)
1097 pol_class
= p
->p_class_val_to_name
[class_val
-1];
1098 cladatum
= hashtab_search(p
->p_classes
.table
, pol_class
);
1100 if (!cladatum
->comdatum
) {
1102 "security: class %s should have an inherits clause but does not\n",
1106 tmp
= kdefs
->av_inherit
[i
].common_base
;
1108 while (!(tmp
& 0x01)) {
1112 perms
= &cladatum
->comdatum
->permissions
;
1113 for (j
= 0; j
< common_pts_len
; j
++) {
1114 def_perm
= kdefs
->av_inherit
[i
].common_pts
[j
];
1115 if (j
>= perms
->nprim
) {
1117 "security: permission %s in class %s not defined in policy\n",
1118 def_perm
, pol_class
);
1121 perdatum
= hashtab_search(perms
->table
, def_perm
);
1122 if (perdatum
== NULL
) {
1124 "security: permission %s in class %s not found in policy\n",
1125 def_perm
, pol_class
);
1128 if (perdatum
->value
!= j
+ 1) {
1130 "security: permission %s in class %s has incorrect value\n",
1131 def_perm
, pol_class
);
1139 /* Clone the SID into the new SID table. */
1140 static int clone_sid(u32 sid
,
1141 struct context
*context
,
1144 struct sidtab
*s
= arg
;
1146 return sidtab_insert(s
, sid
, context
);
1149 static inline int convert_context_handle_invalid_context(struct context
*context
)
1153 if (selinux_enforcing
) {
1159 context_struct_to_string(context
, &s
, &len
);
1160 printk(KERN_ERR
"security: context %s is invalid\n", s
);
1166 struct convert_context_args
{
1167 struct policydb
*oldp
;
1168 struct policydb
*newp
;
1172 * Convert the values in the security context
1173 * structure `c' from the values specified
1174 * in the policy `p->oldp' to the values specified
1175 * in the policy `p->newp'. Verify that the
1176 * context is valid under the new policy.
1178 static int convert_context(u32 key
,
1182 struct convert_context_args
*args
;
1183 struct context oldc
;
1184 struct role_datum
*role
;
1185 struct type_datum
*typdatum
;
1186 struct user_datum
*usrdatum
;
1193 rc
= context_cpy(&oldc
, c
);
1199 /* Convert the user. */
1200 usrdatum
= hashtab_search(args
->newp
->p_users
.table
,
1201 args
->oldp
->p_user_val_to_name
[c
->user
- 1]);
1205 c
->user
= usrdatum
->value
;
1207 /* Convert the role. */
1208 role
= hashtab_search(args
->newp
->p_roles
.table
,
1209 args
->oldp
->p_role_val_to_name
[c
->role
- 1]);
1213 c
->role
= role
->value
;
1215 /* Convert the type. */
1216 typdatum
= hashtab_search(args
->newp
->p_types
.table
,
1217 args
->oldp
->p_type_val_to_name
[c
->type
- 1]);
1221 c
->type
= typdatum
->value
;
1223 rc
= mls_convert_context(args
->oldp
, args
->newp
, c
);
1227 /* Check the validity of the new context. */
1228 if (!policydb_context_isvalid(args
->newp
, c
)) {
1229 rc
= convert_context_handle_invalid_context(&oldc
);
1234 context_destroy(&oldc
);
1238 context_struct_to_string(&oldc
, &s
, &len
);
1239 context_destroy(&oldc
);
1240 printk(KERN_ERR
"security: invalidating context %s\n", s
);
1245 extern void selinux_complete_init(void);
1248 * security_load_policy - Load a security policy configuration.
1249 * @data: binary policy data
1250 * @len: length of data in bytes
1252 * Load a new set of security policy configuration data,
1253 * validate it and convert the SID table as necessary.
1254 * This function will flush the access vector cache after
1255 * loading the new policy.
1257 int security_load_policy(void *data
, size_t len
)
1259 struct policydb oldpolicydb
, newpolicydb
;
1260 struct sidtab oldsidtab
, newsidtab
;
1261 struct convert_context_args args
;
1264 struct policy_file file
= { data
, len
}, *fp
= &file
;
1268 if (!ss_initialized
) {
1270 if (policydb_read(&policydb
, fp
)) {
1272 avtab_cache_destroy();
1275 if (policydb_load_isids(&policydb
, &sidtab
)) {
1277 policydb_destroy(&policydb
);
1278 avtab_cache_destroy();
1281 /* Verify that the kernel defined classes are correct. */
1282 if (validate_classes(&policydb
)) {
1284 "security: the definition of a class is incorrect\n");
1286 sidtab_destroy(&sidtab
);
1287 policydb_destroy(&policydb
);
1288 avtab_cache_destroy();
1291 policydb_loaded_version
= policydb
.policyvers
;
1293 seqno
= ++latest_granting
;
1295 selinux_complete_init();
1296 avc_ss_reset(seqno
);
1297 selnl_notify_policyload(seqno
);
1298 selinux_netlbl_cache_invalidate();
1303 sidtab_hash_eval(&sidtab
, "sids");
1306 if (policydb_read(&newpolicydb
, fp
)) {
1311 sidtab_init(&newsidtab
);
1313 /* Verify that the kernel defined classes are correct. */
1314 if (validate_classes(&newpolicydb
)) {
1316 "security: the definition of a class is incorrect\n");
1321 /* Clone the SID table. */
1322 sidtab_shutdown(&sidtab
);
1323 if (sidtab_map(&sidtab
, clone_sid
, &newsidtab
)) {
1328 /* Convert the internal representations of contexts
1329 in the new SID table and remove invalid SIDs. */
1330 args
.oldp
= &policydb
;
1331 args
.newp
= &newpolicydb
;
1332 sidtab_map_remove_on_error(&newsidtab
, convert_context
, &args
);
1334 /* Save the old policydb and SID table to free later. */
1335 memcpy(&oldpolicydb
, &policydb
, sizeof policydb
);
1336 sidtab_set(&oldsidtab
, &sidtab
);
1338 /* Install the new policydb and SID table. */
1340 memcpy(&policydb
, &newpolicydb
, sizeof policydb
);
1341 sidtab_set(&sidtab
, &newsidtab
);
1342 seqno
= ++latest_granting
;
1343 policydb_loaded_version
= policydb
.policyvers
;
1347 /* Free the old policydb and SID table. */
1348 policydb_destroy(&oldpolicydb
);
1349 sidtab_destroy(&oldsidtab
);
1351 avc_ss_reset(seqno
);
1352 selnl_notify_policyload(seqno
);
1353 selinux_netlbl_cache_invalidate();
1359 sidtab_destroy(&newsidtab
);
1360 policydb_destroy(&newpolicydb
);
1366 * security_port_sid - Obtain the SID for a port.
1367 * @domain: communication domain aka address family
1368 * @type: socket type
1369 * @protocol: protocol number
1370 * @port: port number
1371 * @out_sid: security identifier
1373 int security_port_sid(u16 domain
,
1384 c
= policydb
.ocontexts
[OCON_PORT
];
1386 if (c
->u
.port
.protocol
== protocol
&&
1387 c
->u
.port
.low_port
<= port
&&
1388 c
->u
.port
.high_port
>= port
)
1395 rc
= sidtab_context_to_sid(&sidtab
,
1401 *out_sid
= c
->sid
[0];
1403 *out_sid
= SECINITSID_PORT
;
1412 * security_netif_sid - Obtain the SID for a network interface.
1413 * @name: interface name
1414 * @if_sid: interface SID
1415 * @msg_sid: default SID for received packets
1417 int security_netif_sid(char *name
,
1426 c
= policydb
.ocontexts
[OCON_NETIF
];
1428 if (strcmp(name
, c
->u
.name
) == 0)
1434 if (!c
->sid
[0] || !c
->sid
[1]) {
1435 rc
= sidtab_context_to_sid(&sidtab
,
1440 rc
= sidtab_context_to_sid(&sidtab
,
1446 *if_sid
= c
->sid
[0];
1447 *msg_sid
= c
->sid
[1];
1449 *if_sid
= SECINITSID_NETIF
;
1450 *msg_sid
= SECINITSID_NETMSG
;
1458 static int match_ipv6_addrmask(u32
*input
, u32
*addr
, u32
*mask
)
1462 for(i
= 0; i
< 4; i
++)
1463 if(addr
[i
] != (input
[i
] & mask
[i
])) {
1472 * security_node_sid - Obtain the SID for a node (host).
1473 * @domain: communication domain aka address family
1475 * @addrlen: address length in bytes
1476 * @out_sid: security identifier
1478 int security_node_sid(u16 domain
,
1492 if (addrlen
!= sizeof(u32
)) {
1497 addr
= *((u32
*)addrp
);
1499 c
= policydb
.ocontexts
[OCON_NODE
];
1501 if (c
->u
.node
.addr
== (addr
& c
->u
.node
.mask
))
1509 if (addrlen
!= sizeof(u64
) * 2) {
1513 c
= policydb
.ocontexts
[OCON_NODE6
];
1515 if (match_ipv6_addrmask(addrp
, c
->u
.node6
.addr
,
1523 *out_sid
= SECINITSID_NODE
;
1529 rc
= sidtab_context_to_sid(&sidtab
,
1535 *out_sid
= c
->sid
[0];
1537 *out_sid
= SECINITSID_NODE
;
1548 * security_get_user_sids - Obtain reachable SIDs for a user.
1549 * @fromsid: starting SID
1550 * @username: username
1551 * @sids: array of reachable SIDs for user
1552 * @nel: number of elements in @sids
1554 * Generate the set of SIDs for legal security contexts
1555 * for a given user that can be reached by @fromsid.
1556 * Set *@sids to point to a dynamically allocated
1557 * array containing the set of SIDs. Set *@nel to the
1558 * number of elements in the array.
1561 int security_get_user_sids(u32 fromsid
,
1566 struct context
*fromcon
, usercon
;
1567 u32
*mysids
, *mysids2
, sid
;
1568 u32 mynel
= 0, maxnel
= SIDS_NEL
;
1569 struct user_datum
*user
;
1570 struct role_datum
*role
;
1571 struct av_decision avd
;
1572 struct ebitmap_node
*rnode
, *tnode
;
1575 if (!ss_initialized
) {
1583 fromcon
= sidtab_search(&sidtab
, fromsid
);
1589 user
= hashtab_search(policydb
.p_users
.table
, username
);
1594 usercon
.user
= user
->value
;
1596 mysids
= kcalloc(maxnel
, sizeof(*mysids
), GFP_ATOMIC
);
1602 ebitmap_for_each_bit(&user
->roles
, rnode
, i
) {
1603 if (!ebitmap_node_get_bit(rnode
, i
))
1605 role
= policydb
.role_val_to_struct
[i
];
1607 ebitmap_for_each_bit(&role
->types
, tnode
, j
) {
1608 if (!ebitmap_node_get_bit(tnode
, j
))
1612 if (mls_setup_user_range(fromcon
, user
, &usercon
))
1615 rc
= context_struct_compute_av(fromcon
, &usercon
,
1617 PROCESS__TRANSITION
,
1619 if (rc
|| !(avd
.allowed
& PROCESS__TRANSITION
))
1621 rc
= sidtab_context_to_sid(&sidtab
, &usercon
, &sid
);
1626 if (mynel
< maxnel
) {
1627 mysids
[mynel
++] = sid
;
1630 mysids2
= kcalloc(maxnel
, sizeof(*mysids2
), GFP_ATOMIC
);
1636 memcpy(mysids2
, mysids
, mynel
* sizeof(*mysids2
));
1639 mysids
[mynel
++] = sid
;
1654 * security_genfs_sid - Obtain a SID for a file in a filesystem
1655 * @fstype: filesystem type
1656 * @path: path from root of mount
1657 * @sclass: file security class
1658 * @sid: SID for path
1660 * Obtain a SID to use for a file in a filesystem that
1661 * cannot support xattr or use a fixed labeling behavior like
1662 * transition SIDs or task SIDs.
1664 int security_genfs_sid(const char *fstype
,
1670 struct genfs
*genfs
;
1672 int rc
= 0, cmp
= 0;
1676 for (genfs
= policydb
.genfs
; genfs
; genfs
= genfs
->next
) {
1677 cmp
= strcmp(fstype
, genfs
->fstype
);
1682 if (!genfs
|| cmp
) {
1683 *sid
= SECINITSID_UNLABELED
;
1688 for (c
= genfs
->head
; c
; c
= c
->next
) {
1689 len
= strlen(c
->u
.name
);
1690 if ((!c
->v
.sclass
|| sclass
== c
->v
.sclass
) &&
1691 (strncmp(c
->u
.name
, path
, len
) == 0))
1696 *sid
= SECINITSID_UNLABELED
;
1702 rc
= sidtab_context_to_sid(&sidtab
,
1716 * security_fs_use - Determine how to handle labeling for a filesystem.
1717 * @fstype: filesystem type
1718 * @behavior: labeling behavior
1719 * @sid: SID for filesystem (superblock)
1721 int security_fs_use(
1723 unsigned int *behavior
,
1731 c
= policydb
.ocontexts
[OCON_FSUSE
];
1733 if (strcmp(fstype
, c
->u
.name
) == 0)
1739 *behavior
= c
->v
.behavior
;
1741 rc
= sidtab_context_to_sid(&sidtab
,
1749 rc
= security_genfs_sid(fstype
, "/", SECCLASS_DIR
, sid
);
1751 *behavior
= SECURITY_FS_USE_NONE
;
1754 *behavior
= SECURITY_FS_USE_GENFS
;
1763 int security_get_bools(int *len
, char ***names
, int **values
)
1765 int i
, rc
= -ENOMEM
;
1771 *len
= policydb
.p_bools
.nprim
;
1777 *names
= kcalloc(*len
, sizeof(char*), GFP_ATOMIC
);
1781 *values
= kcalloc(*len
, sizeof(int), GFP_ATOMIC
);
1785 for (i
= 0; i
< *len
; i
++) {
1787 (*values
)[i
] = policydb
.bool_val_to_struct
[i
]->state
;
1788 name_len
= strlen(policydb
.p_bool_val_to_name
[i
]) + 1;
1789 (*names
)[i
] = kmalloc(sizeof(char) * name_len
, GFP_ATOMIC
);
1792 strncpy((*names
)[i
], policydb
.p_bool_val_to_name
[i
], name_len
);
1793 (*names
)[i
][name_len
- 1] = 0;
1801 for (i
= 0; i
< *len
; i
++)
1809 int security_set_bools(int len
, int *values
)
1812 int lenp
, seqno
= 0;
1813 struct cond_node
*cur
;
1817 lenp
= policydb
.p_bools
.nprim
;
1823 for (i
= 0; i
< len
; i
++) {
1824 if (!!values
[i
] != policydb
.bool_val_to_struct
[i
]->state
) {
1825 audit_log(current
->audit_context
, GFP_ATOMIC
,
1826 AUDIT_MAC_CONFIG_CHANGE
,
1827 "bool=%s val=%d old_val=%d auid=%u",
1828 policydb
.p_bool_val_to_name
[i
],
1830 policydb
.bool_val_to_struct
[i
]->state
,
1831 audit_get_loginuid(current
->audit_context
));
1834 policydb
.bool_val_to_struct
[i
]->state
= 1;
1836 policydb
.bool_val_to_struct
[i
]->state
= 0;
1840 for (cur
= policydb
.cond_list
; cur
!= NULL
; cur
= cur
->next
) {
1841 rc
= evaluate_cond_node(&policydb
, cur
);
1846 seqno
= ++latest_granting
;
1851 avc_ss_reset(seqno
);
1852 selnl_notify_policyload(seqno
);
1857 int security_get_bool_value(int bool)
1864 len
= policydb
.p_bools
.nprim
;
1870 rc
= policydb
.bool_val_to_struct
[bool]->state
;
1877 * security_sid_mls_copy() - computes a new sid based on the given
1878 * sid and the mls portion of mls_sid.
1880 int security_sid_mls_copy(u32 sid
, u32 mls_sid
, u32
*new_sid
)
1882 struct context
*context1
;
1883 struct context
*context2
;
1884 struct context newcon
;
1889 if (!ss_initialized
|| !selinux_mls_enabled
) {
1894 context_init(&newcon
);
1897 context1
= sidtab_search(&sidtab
, sid
);
1899 printk(KERN_ERR
"security_sid_mls_copy: unrecognized SID "
1905 context2
= sidtab_search(&sidtab
, mls_sid
);
1907 printk(KERN_ERR
"security_sid_mls_copy: unrecognized SID "
1913 newcon
.user
= context1
->user
;
1914 newcon
.role
= context1
->role
;
1915 newcon
.type
= context1
->type
;
1916 rc
= mls_copy_context(&newcon
, context2
);
1921 /* Check the validity of the new context. */
1922 if (!policydb_context_isvalid(&policydb
, &newcon
)) {
1923 rc
= convert_context_handle_invalid_context(&newcon
);
1928 rc
= sidtab_context_to_sid(&sidtab
, &newcon
, new_sid
);
1932 if (!context_struct_to_string(&newcon
, &s
, &len
)) {
1933 audit_log(current
->audit_context
, GFP_ATOMIC
, AUDIT_SELINUX_ERR
,
1934 "security_sid_mls_copy: invalid context %s", s
);
1940 context_destroy(&newcon
);
1945 struct selinux_audit_rule
{
1947 struct context au_ctxt
;
1950 void selinux_audit_rule_free(struct selinux_audit_rule
*rule
)
1953 context_destroy(&rule
->au_ctxt
);
1958 int selinux_audit_rule_init(u32 field
, u32 op
, char *rulestr
,
1959 struct selinux_audit_rule
**rule
)
1961 struct selinux_audit_rule
*tmprule
;
1962 struct role_datum
*roledatum
;
1963 struct type_datum
*typedatum
;
1964 struct user_datum
*userdatum
;
1969 if (!ss_initialized
)
1973 case AUDIT_SUBJ_USER
:
1974 case AUDIT_SUBJ_ROLE
:
1975 case AUDIT_SUBJ_TYPE
:
1976 case AUDIT_OBJ_USER
:
1977 case AUDIT_OBJ_ROLE
:
1978 case AUDIT_OBJ_TYPE
:
1979 /* only 'equals' and 'not equals' fit user, role, and type */
1980 if (op
!= AUDIT_EQUAL
&& op
!= AUDIT_NOT_EQUAL
)
1983 case AUDIT_SUBJ_SEN
:
1984 case AUDIT_SUBJ_CLR
:
1985 case AUDIT_OBJ_LEV_LOW
:
1986 case AUDIT_OBJ_LEV_HIGH
:
1987 /* we do not allow a range, indicated by the presense of '-' */
1988 if (strchr(rulestr
, '-'))
1992 /* only the above fields are valid */
1996 tmprule
= kzalloc(sizeof(struct selinux_audit_rule
), GFP_KERNEL
);
2000 context_init(&tmprule
->au_ctxt
);
2004 tmprule
->au_seqno
= latest_granting
;
2007 case AUDIT_SUBJ_USER
:
2008 case AUDIT_OBJ_USER
:
2009 userdatum
= hashtab_search(policydb
.p_users
.table
, rulestr
);
2013 tmprule
->au_ctxt
.user
= userdatum
->value
;
2015 case AUDIT_SUBJ_ROLE
:
2016 case AUDIT_OBJ_ROLE
:
2017 roledatum
= hashtab_search(policydb
.p_roles
.table
, rulestr
);
2021 tmprule
->au_ctxt
.role
= roledatum
->value
;
2023 case AUDIT_SUBJ_TYPE
:
2024 case AUDIT_OBJ_TYPE
:
2025 typedatum
= hashtab_search(policydb
.p_types
.table
, rulestr
);
2029 tmprule
->au_ctxt
.type
= typedatum
->value
;
2031 case AUDIT_SUBJ_SEN
:
2032 case AUDIT_SUBJ_CLR
:
2033 case AUDIT_OBJ_LEV_LOW
:
2034 case AUDIT_OBJ_LEV_HIGH
:
2035 rc
= mls_from_string(rulestr
, &tmprule
->au_ctxt
, GFP_ATOMIC
);
2042 selinux_audit_rule_free(tmprule
);
2051 int selinux_audit_rule_match(u32 sid
, u32 field
, u32 op
,
2052 struct selinux_audit_rule
*rule
,
2053 struct audit_context
*actx
)
2055 struct context
*ctxt
;
2056 struct mls_level
*level
;
2060 audit_log(actx
, GFP_ATOMIC
, AUDIT_SELINUX_ERR
,
2061 "selinux_audit_rule_match: missing rule\n");
2067 if (rule
->au_seqno
< latest_granting
) {
2068 audit_log(actx
, GFP_ATOMIC
, AUDIT_SELINUX_ERR
,
2069 "selinux_audit_rule_match: stale rule\n");
2074 ctxt
= sidtab_search(&sidtab
, sid
);
2076 audit_log(actx
, GFP_ATOMIC
, AUDIT_SELINUX_ERR
,
2077 "selinux_audit_rule_match: unrecognized SID %d\n",
2083 /* a field/op pair that is not caught here will simply fall through
2086 case AUDIT_SUBJ_USER
:
2087 case AUDIT_OBJ_USER
:
2090 match
= (ctxt
->user
== rule
->au_ctxt
.user
);
2092 case AUDIT_NOT_EQUAL
:
2093 match
= (ctxt
->user
!= rule
->au_ctxt
.user
);
2097 case AUDIT_SUBJ_ROLE
:
2098 case AUDIT_OBJ_ROLE
:
2101 match
= (ctxt
->role
== rule
->au_ctxt
.role
);
2103 case AUDIT_NOT_EQUAL
:
2104 match
= (ctxt
->role
!= rule
->au_ctxt
.role
);
2108 case AUDIT_SUBJ_TYPE
:
2109 case AUDIT_OBJ_TYPE
:
2112 match
= (ctxt
->type
== rule
->au_ctxt
.type
);
2114 case AUDIT_NOT_EQUAL
:
2115 match
= (ctxt
->type
!= rule
->au_ctxt
.type
);
2119 case AUDIT_SUBJ_SEN
:
2120 case AUDIT_SUBJ_CLR
:
2121 case AUDIT_OBJ_LEV_LOW
:
2122 case AUDIT_OBJ_LEV_HIGH
:
2123 level
= ((field
== AUDIT_SUBJ_SEN
||
2124 field
== AUDIT_OBJ_LEV_LOW
) ?
2125 &ctxt
->range
.level
[0] : &ctxt
->range
.level
[1]);
2128 match
= mls_level_eq(&rule
->au_ctxt
.range
.level
[0],
2131 case AUDIT_NOT_EQUAL
:
2132 match
= !mls_level_eq(&rule
->au_ctxt
.range
.level
[0],
2135 case AUDIT_LESS_THAN
:
2136 match
= (mls_level_dom(&rule
->au_ctxt
.range
.level
[0],
2138 !mls_level_eq(&rule
->au_ctxt
.range
.level
[0],
2141 case AUDIT_LESS_THAN_OR_EQUAL
:
2142 match
= mls_level_dom(&rule
->au_ctxt
.range
.level
[0],
2145 case AUDIT_GREATER_THAN
:
2146 match
= (mls_level_dom(level
,
2147 &rule
->au_ctxt
.range
.level
[0]) &&
2148 !mls_level_eq(level
,
2149 &rule
->au_ctxt
.range
.level
[0]));
2151 case AUDIT_GREATER_THAN_OR_EQUAL
:
2152 match
= mls_level_dom(level
,
2153 &rule
->au_ctxt
.range
.level
[0]);
2163 static int (*aurule_callback
)(void) = NULL
;
2165 static int aurule_avc_callback(u32 event
, u32 ssid
, u32 tsid
,
2166 u16
class, u32 perms
, u32
*retained
)
2170 if (event
== AVC_CALLBACK_RESET
&& aurule_callback
)
2171 err
= aurule_callback();
2175 static int __init
aurule_init(void)
2179 err
= avc_add_callback(aurule_avc_callback
, AVC_CALLBACK_RESET
,
2180 SECSID_NULL
, SECSID_NULL
, SECCLASS_NULL
, 0);
2182 panic("avc_add_callback() failed, error %d\n", err
);
2186 __initcall(aurule_init
);
2188 void selinux_audit_set_callback(int (*callback
)(void))
2190 aurule_callback
= callback
;
2193 #ifdef CONFIG_NETLABEL
2195 * This is the structure we store inside the NetLabel cache block.
2197 #define NETLBL_CACHE(x) ((struct netlbl_cache *)(x))
2198 #define NETLBL_CACHE_T_NONE 0
2199 #define NETLBL_CACHE_T_SID 1
2200 #define NETLBL_CACHE_T_MLS 2
2201 struct netlbl_cache
{
2205 struct mls_range mls_label
;
2210 * selinux_netlbl_cache_free - Free the NetLabel cached data
2211 * @data: the data to free
2214 * This function is intended to be used as the free() callback inside the
2215 * netlbl_lsm_cache structure.
2218 static void selinux_netlbl_cache_free(const void *data
)
2220 struct netlbl_cache
*cache
;
2225 cache
= NETLBL_CACHE(data
);
2226 switch (cache
->type
) {
2227 case NETLBL_CACHE_T_MLS
:
2228 ebitmap_destroy(&cache
->data
.mls_label
.level
[0].cat
);
2235 * selinux_netlbl_cache_add - Add an entry to the NetLabel cache
2237 * @ctx: the SELinux context
2240 * Attempt to cache the context in @ctx, which was derived from the packet in
2241 * @skb, in the NetLabel subsystem cache.
2244 static void selinux_netlbl_cache_add(struct sk_buff
*skb
, struct context
*ctx
)
2246 struct netlbl_cache
*cache
= NULL
;
2247 struct netlbl_lsm_secattr secattr
;
2249 netlbl_secattr_init(&secattr
);
2250 secattr
.cache
= netlbl_secattr_cache_alloc(GFP_ATOMIC
);
2251 if (secattr
.cache
== NULL
)
2252 goto netlbl_cache_add_return
;
2254 cache
= kzalloc(sizeof(*cache
), GFP_ATOMIC
);
2256 goto netlbl_cache_add_return
;
2258 cache
->type
= NETLBL_CACHE_T_MLS
;
2259 if (ebitmap_cpy(&cache
->data
.mls_label
.level
[0].cat
,
2260 &ctx
->range
.level
[0].cat
) != 0)
2261 goto netlbl_cache_add_return
;
2262 cache
->data
.mls_label
.level
[1].cat
.highbit
=
2263 cache
->data
.mls_label
.level
[0].cat
.highbit
;
2264 cache
->data
.mls_label
.level
[1].cat
.node
=
2265 cache
->data
.mls_label
.level
[0].cat
.node
;
2266 cache
->data
.mls_label
.level
[0].sens
= ctx
->range
.level
[0].sens
;
2267 cache
->data
.mls_label
.level
[1].sens
= ctx
->range
.level
[0].sens
;
2269 secattr
.cache
->free
= selinux_netlbl_cache_free
;
2270 secattr
.cache
->data
= (void *)cache
;
2271 secattr
.flags
= NETLBL_SECATTR_CACHE
;
2273 netlbl_cache_add(skb
, &secattr
);
2275 netlbl_cache_add_return
:
2276 netlbl_secattr_destroy(&secattr
);
2280 * selinux_netlbl_cache_invalidate - Invalidate the NetLabel cache
2283 * Invalidate the NetLabel security attribute mapping cache.
2286 void selinux_netlbl_cache_invalidate(void)
2288 netlbl_cache_invalidate();
2292 * selinux_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID
2293 * @skb: the network packet
2294 * @secattr: the NetLabel packet security attributes
2295 * @base_sid: the SELinux SID to use as a context for MLS only attributes
2296 * @sid: the SELinux SID
2299 * Convert the given NetLabel packet security attributes in @secattr into a
2300 * SELinux SID. If the @secattr field does not contain a full SELinux
2301 * SID/context then use the context in @base_sid as the foundation. If @skb
2302 * is not NULL attempt to cache as much data as possibile. Returns zero on
2303 * success, negative values on failure.
2306 static int selinux_netlbl_secattr_to_sid(struct sk_buff
*skb
,
2307 struct netlbl_lsm_secattr
*secattr
,
2312 struct context
*ctx
;
2313 struct context ctx_new
;
2314 struct netlbl_cache
*cache
;
2318 if (secattr
->flags
& NETLBL_SECATTR_CACHE
) {
2319 cache
= NETLBL_CACHE(secattr
->cache
->data
);
2320 switch (cache
->type
) {
2321 case NETLBL_CACHE_T_SID
:
2322 *sid
= cache
->data
.sid
;
2325 case NETLBL_CACHE_T_MLS
:
2326 ctx
= sidtab_search(&sidtab
, base_sid
);
2328 goto netlbl_secattr_to_sid_return
;
2330 ctx_new
.user
= ctx
->user
;
2331 ctx_new
.role
= ctx
->role
;
2332 ctx_new
.type
= ctx
->type
;
2333 ctx_new
.range
.level
[0].sens
=
2334 cache
->data
.mls_label
.level
[0].sens
;
2335 ctx_new
.range
.level
[0].cat
.highbit
=
2336 cache
->data
.mls_label
.level
[0].cat
.highbit
;
2337 ctx_new
.range
.level
[0].cat
.node
=
2338 cache
->data
.mls_label
.level
[0].cat
.node
;
2339 ctx_new
.range
.level
[1].sens
=
2340 cache
->data
.mls_label
.level
[1].sens
;
2341 ctx_new
.range
.level
[1].cat
.highbit
=
2342 cache
->data
.mls_label
.level
[1].cat
.highbit
;
2343 ctx_new
.range
.level
[1].cat
.node
=
2344 cache
->data
.mls_label
.level
[1].cat
.node
;
2346 rc
= sidtab_context_to_sid(&sidtab
, &ctx_new
, sid
);
2349 goto netlbl_secattr_to_sid_return
;
2351 } else if (secattr
->flags
& NETLBL_SECATTR_MLS_LVL
) {
2352 ctx
= sidtab_search(&sidtab
, base_sid
);
2354 goto netlbl_secattr_to_sid_return
;
2356 ctx_new
.user
= ctx
->user
;
2357 ctx_new
.role
= ctx
->role
;
2358 ctx_new
.type
= ctx
->type
;
2359 mls_import_lvl(&ctx_new
, secattr
->mls_lvl
, secattr
->mls_lvl
);
2360 if (secattr
->flags
& NETLBL_SECATTR_MLS_CAT
) {
2361 if (mls_import_cat(&ctx_new
,
2363 secattr
->mls_cat_len
,
2366 goto netlbl_secattr_to_sid_return
;
2367 ctx_new
.range
.level
[1].cat
.highbit
=
2368 ctx_new
.range
.level
[0].cat
.highbit
;
2369 ctx_new
.range
.level
[1].cat
.node
=
2370 ctx_new
.range
.level
[0].cat
.node
;
2372 ebitmap_init(&ctx_new
.range
.level
[0].cat
);
2373 ebitmap_init(&ctx_new
.range
.level
[1].cat
);
2375 if (mls_context_isvalid(&policydb
, &ctx_new
) != 1)
2376 goto netlbl_secattr_to_sid_return_cleanup
;
2378 rc
= sidtab_context_to_sid(&sidtab
, &ctx_new
, sid
);
2380 goto netlbl_secattr_to_sid_return_cleanup
;
2383 selinux_netlbl_cache_add(skb
, &ctx_new
);
2384 ebitmap_destroy(&ctx_new
.range
.level
[0].cat
);
2390 netlbl_secattr_to_sid_return
:
2393 netlbl_secattr_to_sid_return_cleanup
:
2394 ebitmap_destroy(&ctx_new
.range
.level
[0].cat
);
2395 goto netlbl_secattr_to_sid_return
;
2399 * selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel
2401 * @base_sid: the SELinux SID to use as a context for MLS only attributes
2405 * Call the NetLabel mechanism to get the security attributes of the given
2406 * packet and use those attributes to determine the correct context/SID to
2407 * assign to the packet. Returns zero on success, negative values on failure.
2410 static int selinux_netlbl_skbuff_getsid(struct sk_buff
*skb
,
2415 struct netlbl_lsm_secattr secattr
;
2417 netlbl_secattr_init(&secattr
);
2418 rc
= netlbl_skbuff_getattr(skb
, &secattr
);
2419 if (rc
== 0 && secattr
.flags
!= NETLBL_SECATTR_NONE
)
2420 rc
= selinux_netlbl_secattr_to_sid(skb
,
2426 netlbl_secattr_destroy(&secattr
);
2432 * selinux_netlbl_socket_setsid - Label a socket using the NetLabel mechanism
2433 * @sock: the socket to label
2434 * @sid: the SID to use
2437 * Attempt to label a socket using the NetLabel mechanism using the given
2438 * SID. Returns zero values on success, negative values on failure.
2441 static int selinux_netlbl_socket_setsid(struct socket
*sock
, u32 sid
)
2444 struct sk_security_struct
*sksec
= sock
->sk
->sk_security
;
2445 struct netlbl_lsm_secattr secattr
;
2446 struct context
*ctx
;
2448 if (!ss_initialized
)
2451 netlbl_secattr_init(&secattr
);
2455 ctx
= sidtab_search(&sidtab
, sid
);
2457 goto netlbl_socket_setsid_return
;
2459 secattr
.domain
= kstrdup(policydb
.p_type_val_to_name
[ctx
->type
- 1],
2461 mls_export_lvl(ctx
, &secattr
.mls_lvl
, NULL
);
2462 rc
= mls_export_cat(ctx
,
2464 &secattr
.mls_cat_len
,
2468 goto netlbl_socket_setsid_return
;
2470 secattr
.flags
|= NETLBL_SECATTR_DOMAIN
| NETLBL_SECATTR_MLS_LVL
;
2471 if (secattr
.mls_cat
)
2472 secattr
.flags
|= NETLBL_SECATTR_MLS_CAT
;
2474 rc
= netlbl_socket_setattr(sock
, &secattr
);
2476 sksec
->nlbl_state
= NLBL_LABELED
;
2478 netlbl_socket_setsid_return
:
2480 netlbl_secattr_destroy(&secattr
);
2485 * selinux_netlbl_sk_security_init - Setup the NetLabel fields
2486 * @ssec: the sk_security_struct
2487 * @family: the socket family
2490 * Called when a new sk_security_struct is allocated to initialize the NetLabel
2494 void selinux_netlbl_sk_security_init(struct sk_security_struct
*ssec
,
2497 if (family
== PF_INET
)
2498 ssec
->nlbl_state
= NLBL_REQUIRE
;
2500 ssec
->nlbl_state
= NLBL_UNSET
;
2504 * selinux_netlbl_sk_clone_security - Copy the NetLabel fields
2505 * @ssec: the original sk_security_struct
2506 * @newssec: the cloned sk_security_struct
2509 * Clone the NetLabel specific sk_security_struct fields from @ssec to
2513 void selinux_netlbl_sk_clone_security(struct sk_security_struct
*ssec
,
2514 struct sk_security_struct
*newssec
)
2516 newssec
->sclass
= ssec
->sclass
;
2517 if (ssec
->nlbl_state
!= NLBL_UNSET
)
2518 newssec
->nlbl_state
= NLBL_REQUIRE
;
2520 newssec
->nlbl_state
= NLBL_UNSET
;
2524 * selinux_netlbl_socket_post_create - Label a socket using NetLabel
2525 * @sock: the socket to label
2526 * @sock_family: the socket family
2527 * @sid: the SID to use
2530 * Attempt to label a socket using the NetLabel mechanism using the given
2531 * SID. Returns zero values on success, negative values on failure.
2534 int selinux_netlbl_socket_post_create(struct socket
*sock
,
2538 struct inode_security_struct
*isec
= SOCK_INODE(sock
)->i_security
;
2539 struct sk_security_struct
*sksec
= sock
->sk
->sk_security
;
2541 sksec
->sclass
= isec
->sclass
;
2543 if (sock_family
!= PF_INET
)
2546 sksec
->nlbl_state
= NLBL_REQUIRE
;
2547 return selinux_netlbl_socket_setsid(sock
, sid
);
2551 * selinux_netlbl_sock_graft - Netlabel the new socket
2552 * @sk: the new connection
2553 * @sock: the new socket
2556 * The connection represented by @sk is being grafted onto @sock so set the
2557 * socket's NetLabel to match the SID of @sk.
2560 void selinux_netlbl_sock_graft(struct sock
*sk
, struct socket
*sock
)
2562 struct inode_security_struct
*isec
= SOCK_INODE(sock
)->i_security
;
2563 struct sk_security_struct
*sksec
= sk
->sk_security
;
2564 struct netlbl_lsm_secattr secattr
;
2567 sksec
->sclass
= isec
->sclass
;
2569 if (sk
->sk_family
!= PF_INET
)
2572 netlbl_secattr_init(&secattr
);
2573 if (netlbl_sock_getattr(sk
, &secattr
) == 0 &&
2574 secattr
.flags
!= NETLBL_SECATTR_NONE
&&
2575 selinux_netlbl_secattr_to_sid(NULL
,
2577 SECINITSID_UNLABELED
,
2578 &nlbl_peer_sid
) == 0)
2579 sksec
->peer_sid
= nlbl_peer_sid
;
2580 netlbl_secattr_destroy(&secattr
);
2582 sksec
->nlbl_state
= NLBL_REQUIRE
;
2584 /* Try to set the NetLabel on the socket to save time later, if we fail
2585 * here we will pick up the pieces in later calls to
2586 * selinux_netlbl_inode_permission(). */
2587 selinux_netlbl_socket_setsid(sock
, sksec
->sid
);
2591 * selinux_netlbl_inet_conn_request - Handle a new connection request
2593 * @sock_sid: the SID of the parent socket
2596 * If present, use the security attributes of the packet in @skb and the
2597 * parent sock's SID to arrive at a SID for the new child sock. Returns the
2598 * SID of the connection or SECSID_NULL on failure.
2601 u32
selinux_netlbl_inet_conn_request(struct sk_buff
*skb
, u32 sock_sid
)
2606 rc
= selinux_netlbl_skbuff_getsid(skb
, sock_sid
, &peer_sid
);
2614 * selinux_netlbl_inode_permission - Verify the socket is NetLabel labeled
2615 * @inode: the file descriptor's inode
2616 * @mask: the permission mask
2619 * Looks at a file's inode and if it is marked as a socket protected by
2620 * NetLabel then verify that the socket has been labeled, if not try to label
2621 * the socket now with the inode's SID. Returns zero on success, negative
2622 * values on failure.
2625 int selinux_netlbl_inode_permission(struct inode
*inode
, int mask
)
2628 struct inode_security_struct
*isec
;
2629 struct sk_security_struct
*sksec
;
2630 struct socket
*sock
;
2632 if (!S_ISSOCK(inode
->i_mode
))
2635 sock
= SOCKET_I(inode
);
2636 isec
= inode
->i_security
;
2637 sksec
= sock
->sk
->sk_security
;
2638 mutex_lock(&isec
->lock
);
2639 if (unlikely(sksec
->nlbl_state
== NLBL_REQUIRE
&&
2640 (mask
& (MAY_WRITE
| MAY_APPEND
)))) {
2641 lock_sock(sock
->sk
);
2642 rc
= selinux_netlbl_socket_setsid(sock
, sksec
->sid
);
2643 release_sock(sock
->sk
);
2646 mutex_unlock(&isec
->lock
);
2652 * selinux_netlbl_sock_rcv_skb - Do an inbound access check using NetLabel
2653 * @sksec: the sock's sk_security_struct
2655 * @ad: the audit data
2658 * Fetch the NetLabel security attributes from @skb and perform an access check
2659 * against the receiving socket. Returns zero on success, negative values on
2663 int selinux_netlbl_sock_rcv_skb(struct sk_security_struct
*sksec
,
2664 struct sk_buff
*skb
,
2665 struct avc_audit_data
*ad
)
2671 rc
= selinux_netlbl_skbuff_getsid(skb
,
2672 SECINITSID_UNLABELED
,
2677 if (netlbl_sid
== SECSID_NULL
)
2680 switch (sksec
->sclass
) {
2681 case SECCLASS_UDP_SOCKET
:
2682 recv_perm
= UDP_SOCKET__RECVFROM
;
2684 case SECCLASS_TCP_SOCKET
:
2685 recv_perm
= TCP_SOCKET__RECVFROM
;
2688 recv_perm
= RAWIP_SOCKET__RECVFROM
;
2691 rc
= avc_has_perm(sksec
->sid
,
2699 netlbl_skbuff_err(skb
, rc
);
2704 * selinux_netlbl_socket_getpeersec_stream - Return the connected peer's SID
2708 * Examine @sock to find the connected peer's SID. Returns the SID on success
2709 * or SECSID_NULL on error.
2712 u32
selinux_netlbl_socket_getpeersec_stream(struct socket
*sock
)
2714 struct sk_security_struct
*sksec
= sock
->sk
->sk_security
;
2715 return sksec
->peer_sid
;
2719 * selinux_netlbl_socket_getpeersec_dgram - Return the SID of a NetLabel packet
2723 * Examine @skb to find the SID assigned to it by NetLabel. Returns the SID on
2724 * success, SECSID_NULL on error.
2727 u32
selinux_netlbl_socket_getpeersec_dgram(struct sk_buff
*skb
)
2731 if (selinux_netlbl_skbuff_getsid(skb
,
2732 SECINITSID_UNLABELED
,
2740 * selinux_netlbl_socket_setsockopt - Do not allow users to remove a NetLabel
2742 * @level: the socket level or protocol
2743 * @optname: the socket option name
2746 * Check the setsockopt() call and if the user is trying to replace the IP
2747 * options on a socket and a NetLabel is in place for the socket deny the
2748 * access; otherwise allow the access. Returns zero when the access is
2749 * allowed, -EACCES when denied, and other negative values on error.
2752 int selinux_netlbl_socket_setsockopt(struct socket
*sock
,
2757 struct inode
*inode
= SOCK_INODE(sock
);
2758 struct sk_security_struct
*sksec
= sock
->sk
->sk_security
;
2759 struct inode_security_struct
*isec
= inode
->i_security
;
2760 struct netlbl_lsm_secattr secattr
;
2762 mutex_lock(&isec
->lock
);
2763 if (level
== IPPROTO_IP
&& optname
== IP_OPTIONS
&&
2764 sksec
->nlbl_state
== NLBL_LABELED
) {
2765 netlbl_secattr_init(&secattr
);
2766 rc
= netlbl_socket_getattr(sock
, &secattr
);
2767 if (rc
== 0 && secattr
.flags
!= NETLBL_SECATTR_NONE
)
2769 netlbl_secattr_destroy(&secattr
);
2771 mutex_unlock(&isec
->lock
);
2775 #endif /* CONFIG_NETLABEL */