mirror of https://gitee.com/openkylin/linux.git
189 lines
5.5 KiB
C
189 lines
5.5 KiB
C
/*
|
|
* Copyright (C) 2005,2006,2007,2008 IBM Corporation
|
|
*
|
|
* Authors:
|
|
* Reiner Sailer <sailer@watson.ibm.com>
|
|
* Mimi Zohar <zohar@us.ibm.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation, version 2 of the
|
|
* License.
|
|
*
|
|
* File: ima.h
|
|
* internal Integrity Measurement Architecture (IMA) definitions
|
|
*/
|
|
|
|
#ifndef __LINUX_IMA_H
|
|
#define __LINUX_IMA_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/security.h>
|
|
#include <linux/hash.h>
|
|
#include <linux/tpm.h>
|
|
#include <linux/audit.h>
|
|
|
|
#include "../integrity.h"
|
|
|
|
enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII };
|
|
enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 };
|
|
|
|
/* digest size for IMA, fits SHA1 or MD5 */
|
|
#define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE
|
|
#define IMA_EVENT_NAME_LEN_MAX 255
|
|
|
|
#define IMA_HASH_BITS 9
|
|
#define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
|
|
|
|
/* set during initialization */
|
|
extern int ima_initialized;
|
|
extern int ima_used_chip;
|
|
extern char *ima_hash;
|
|
extern int ima_appraise;
|
|
|
|
/* IMA inode template definition */
|
|
struct ima_template_data {
|
|
u8 digest[IMA_DIGEST_SIZE]; /* sha1/md5 measurement hash */
|
|
char file_name[IMA_EVENT_NAME_LEN_MAX + 1]; /* name + \0 */
|
|
};
|
|
|
|
struct ima_template_entry {
|
|
u8 digest[IMA_DIGEST_SIZE]; /* sha1 or md5 measurement hash */
|
|
const char *template_name;
|
|
int template_len;
|
|
struct ima_template_data template;
|
|
};
|
|
|
|
struct ima_queue_entry {
|
|
struct hlist_node hnext; /* place in hash collision list */
|
|
struct list_head later; /* place in ima_measurements list */
|
|
struct ima_template_entry *entry;
|
|
};
|
|
extern struct list_head ima_measurements; /* list of all measurements */
|
|
|
|
/* Internal IMA function definitions */
|
|
int ima_init(void);
|
|
void ima_cleanup(void);
|
|
int ima_fs_init(void);
|
|
void ima_fs_cleanup(void);
|
|
int ima_inode_alloc(struct inode *inode);
|
|
int ima_add_template_entry(struct ima_template_entry *entry, int violation,
|
|
const char *op, struct inode *inode);
|
|
int ima_calc_file_hash(struct file *file, char *digest);
|
|
int ima_calc_buffer_hash(const void *data, int len, char *digest);
|
|
int ima_calc_boot_aggregate(char *digest);
|
|
void ima_add_violation(struct inode *inode, const unsigned char *filename,
|
|
const char *op, const char *cause);
|
|
int ima_init_crypto(void);
|
|
|
|
/*
|
|
* used to protect h_table and sha_table
|
|
*/
|
|
extern spinlock_t ima_queue_lock;
|
|
|
|
struct ima_h_table {
|
|
atomic_long_t len; /* number of stored measurements in the list */
|
|
atomic_long_t violations;
|
|
struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
|
|
};
|
|
extern struct ima_h_table ima_htable;
|
|
|
|
static inline unsigned long ima_hash_key(u8 *digest)
|
|
{
|
|
return hash_long(*digest, IMA_HASH_BITS);
|
|
}
|
|
|
|
/* LIM API function definitions */
|
|
int ima_get_action(struct inode *inode, int mask, int function);
|
|
int ima_must_measure(struct inode *inode, int mask, int function);
|
|
int ima_collect_measurement(struct integrity_iint_cache *iint,
|
|
struct file *file);
|
|
void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
|
|
const unsigned char *filename);
|
|
void ima_audit_measurement(struct integrity_iint_cache *iint,
|
|
const unsigned char *filename);
|
|
int ima_store_template(struct ima_template_entry *entry, int violation,
|
|
struct inode *inode);
|
|
void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show);
|
|
const char *ima_d_path(struct path *path, char **pathbuf);
|
|
|
|
/* rbtree tree calls to lookup, insert, delete
|
|
* integrity data associated with an inode.
|
|
*/
|
|
struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
|
|
struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
|
|
|
|
/* IMA policy related functions */
|
|
enum ima_hooks { FILE_CHECK = 1, MMAP_CHECK, BPRM_CHECK, MODULE_CHECK, POST_SETATTR };
|
|
|
|
int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask,
|
|
int flags);
|
|
void ima_init_policy(void);
|
|
void ima_update_policy(void);
|
|
ssize_t ima_parse_add_rule(char *);
|
|
void ima_delete_rules(void);
|
|
|
|
/* Appraise integrity measurements */
|
|
#define IMA_APPRAISE_ENFORCE 0x01
|
|
#define IMA_APPRAISE_FIX 0x02
|
|
#define IMA_APPRAISE_MODULES 0x04
|
|
|
|
#ifdef CONFIG_IMA_APPRAISE
|
|
int ima_appraise_measurement(int func, struct integrity_iint_cache *iint,
|
|
struct file *file, const unsigned char *filename);
|
|
int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func);
|
|
void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
|
|
enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
|
|
int func);
|
|
|
|
#else
|
|
static inline int ima_appraise_measurement(int func,
|
|
struct integrity_iint_cache *iint,
|
|
struct file *file,
|
|
const unsigned char *filename)
|
|
{
|
|
return INTEGRITY_UNKNOWN;
|
|
}
|
|
|
|
static inline int ima_must_appraise(struct inode *inode, int mask,
|
|
enum ima_hooks func)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void ima_update_xattr(struct integrity_iint_cache *iint,
|
|
struct file *file)
|
|
{
|
|
}
|
|
|
|
static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
|
|
*iint, int func)
|
|
{
|
|
return INTEGRITY_UNKNOWN;
|
|
}
|
|
#endif
|
|
|
|
/* LSM based policy rules require audit */
|
|
#ifdef CONFIG_IMA_LSM_RULES
|
|
|
|
#define security_filter_rule_init security_audit_rule_init
|
|
#define security_filter_rule_match security_audit_rule_match
|
|
|
|
#else
|
|
|
|
static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
|
|
void **lsmrule)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
|
|
void *lsmrule,
|
|
struct audit_context *actx)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif /* CONFIG_IMA_LSM_RULES */
|
|
#endif
|