linux/security/selinux/include/avc.h

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/*
* Access vector cache interface for object managers.
*
* Author : Stephen Smalley, <sds@epoch.ncsc.mil>
*/
#ifndef _SELINUX_AVC_H_
#define _SELINUX_AVC_H_
#include <linux/stddef.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/kdev_t.h>
#include <linux/spinlock.h>
#include <linux/init.h>
SELinux: add boundary support and thread context assignment The purpose of this patch is to assign per-thread security context under a constraint. It enables multi-threaded server application to kick a request handler with its fair security context, and helps some of userspace object managers to handle user's request. When we assign a per-thread security context, it must not have wider permissions than the original one. Because a multi-threaded process shares a single local memory, an arbitary per-thread security context also means another thread can easily refer violated information. The constraint on a per-thread security context requires a new domain has to be equal or weaker than its original one, when it tries to assign a per-thread security context. Bounds relationship between two types is a way to ensure a domain can never have wider permission than its bounds. We can define it in two explicit or implicit ways. The first way is using new TYPEBOUNDS statement. It enables to define a boundary of types explicitly. The other one expand the concept of existing named based hierarchy. If we defines a type with "." separated name like "httpd_t.php", toolchain implicitly set its bounds on "httpd_t". This feature requires a new policy version. The 24th version (POLICYDB_VERSION_BOUNDARY) enables to ship them into kernel space, and the following patch enables to handle it. Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
2008-08-28 07:35:57 +00:00
#include <linux/audit.h>
#include <linux/lsm_audit.h>
#include <linux/in6.h>
#include <asm/system.h>
#include "flask.h"
#include "av_permissions.h"
#include "security.h"
#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
extern int selinux_enforcing;
#else
#define selinux_enforcing 1
#endif
/*
* An entry in the AVC.
*/
struct avc_entry;
struct task_struct;
struct inode;
struct sock;
struct sk_buff;
/*
* AVC statistics
*/
struct avc_cache_stats {
unsigned int lookups;
unsigned int hits;
unsigned int misses;
unsigned int allocations;
unsigned int reclaims;
unsigned int frees;
};
/*
* AVC operations
*/
void __init avc_init(void);
void avc_audit(u32 ssid, u32 tsid,
u16 tclass, u32 requested,
struct av_decision *avd,
int result,
struct common_audit_data *a);
#define AVC_STRICT 1 /* Ignore permissive mode. */
int avc_has_perm_noaudit(u32 ssid, u32 tsid,
u16 tclass, u32 requested,
unsigned flags,
struct av_decision *avd);
int avc_has_perm(u32 ssid, u32 tsid,
u16 tclass, u32 requested,
struct common_audit_data *auditdata);
u32 avc_policy_seqno(void);
#define AVC_CALLBACK_GRANT 1
#define AVC_CALLBACK_TRY_REVOKE 2
#define AVC_CALLBACK_REVOKE 4
#define AVC_CALLBACK_RESET 8
#define AVC_CALLBACK_AUDITALLOW_ENABLE 16
#define AVC_CALLBACK_AUDITALLOW_DISABLE 32
#define AVC_CALLBACK_AUDITDENY_ENABLE 64
#define AVC_CALLBACK_AUDITDENY_DISABLE 128
int avc_add_callback(int (*callback)(u32 event, u32 ssid, u32 tsid,
u16 tclass, u32 perms,
u32 *out_retained),
u32 events, u32 ssid, u32 tsid,
u16 tclass, u32 perms);
/* Exported to selinuxfs */
int avc_get_hash_stats(char *page);
extern unsigned int avc_cache_threshold;
/* Attempt to free avc node cache */
void avc_disable(void);
#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
DECLARE_PER_CPU(struct avc_cache_stats, avc_cache_stats);
#endif
#endif /* _SELINUX_AVC_H_ */