linux/security/selinux/include/avc.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Access vector cache interface for object managers.
 *
 * Author : Stephen Smalley, <[email protected]>
 */

#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>
#include <linux/audit.h>
#include <linux/lsm_audit.h>
#include <linux/in6.h>
#include "flask.h"
#include "av_permissions.h"
#include "security.h"

/*
 * An entry in the AVC.
 */
struct avc_entry;

struct task_struct;
struct inode;
struct sock;
struct sk_buff;

/*
 * AVC statistics
 */
struct avc_cache_stats { … };

/*
 * We only need this data after we have decided to send an audit message.
 */
struct selinux_audit_data { … } __randomize_layout;

/*
 * AVC operations
 */

void __init avc_init(void);

static inline u32 avc_audit_required(u32 requested, struct av_decision *avd,
				     int result, u32 auditdeny, u32 *deniedp)
{ … }

int slow_avc_audit(u32 ssid, u32 tsid, u16 tclass, u32 requested, u32 audited,
		   u32 denied, int result, struct common_audit_data *a);

/**
 * avc_audit - Audit the granting or denial of permissions.
 * @ssid: source security identifier
 * @tsid: target security identifier
 * @tclass: target security class
 * @requested: requested permissions
 * @avd: access vector decisions
 * @result: result from avc_has_perm_noaudit
 * @a:  auxiliary audit data
 *
 * Audit the granting or denial of permissions in accordance
 * with the policy.  This function is typically called by
 * avc_has_perm() after a permission check, but can also be
 * called directly by callers who use avc_has_perm_noaudit()
 * in order to separate the permission check from the auditing.
 * For example, this separation is useful when the permission check must
 * be performed under a lock, to allow the lock to be released
 * before calling the auditing code.
 */
static inline int avc_audit(u32 ssid, u32 tsid, u16 tclass, u32 requested,
			    struct av_decision *avd, int result,
			    struct common_audit_data *a)
{ … }

#define AVC_STRICT …
#define AVC_EXTENDED_PERMS …
int avc_has_perm_noaudit(u32 ssid, u32 tsid, u16 tclass, u32 requested,
			 unsigned int flags, struct av_decision *avd);

int avc_has_perm(u32 ssid, u32 tsid, u16 tclass, u32 requested,
		 struct common_audit_data *auditdata);

int avc_has_extended_perms(u32 ssid, u32 tsid, u16 tclass, u32 requested,
			   u8 driver, u8 perm, struct common_audit_data *ad);

u32 avc_policy_seqno(void);

#define AVC_CALLBACK_GRANT …
#define AVC_CALLBACK_TRY_REVOKE …
#define AVC_CALLBACK_REVOKE …
#define AVC_CALLBACK_RESET …
#define AVC_CALLBACK_AUDITALLOW_ENABLE …
#define AVC_CALLBACK_AUDITALLOW_DISABLE …
#define AVC_CALLBACK_AUDITDENY_ENABLE …
#define AVC_CALLBACK_AUDITDENY_DISABLE …
#define AVC_CALLBACK_ADD_XPERMS …

int avc_add_callback(int (*callback)(u32 event), u32 events);

/* Exported to selinuxfs */
int avc_get_hash_stats(char *page);
unsigned int avc_get_cache_threshold(void);
void avc_set_cache_threshold(unsigned int cache_threshold);

#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
DECLARE_PER_CPU(struct avc_cache_stats, avc_cache_stats);
#endif

#endif /* _SELINUX_AVC_H_ */