[net-next-2.6.git] / security / integrity / ima / ima.h

/*
 * 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>

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		20
#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;

/* 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 */
	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 */

/* declarations */
void integrity_audit_msg(int audit_msgno, struct inode *inode,
			 const unsigned char *fname, const char *op,
			 const char *cause, int result, int info);

/* Internal IMA function definitions */
void ima_iintcache_init(void);
int ima_init(void);
void ima_cleanup(void);
int ima_fs_init(void);
void ima_fs_cleanup(void);
int ima_add_template_entry(struct ima_template_entry *entry, int violation,
			   const char *op, struct inode *inode);
int ima_calc_hash(struct file *file, char *digest);
int ima_calc_template_hash(int template_len, void *template, 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);

/*
 * 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);
}

/* iint cache flags */
#define IMA_MEASURED		1
#define IMA_IINT_DUMP_STACK	512

/* integrity data associated with an inode */
struct ima_iint_cache {
	u64 version;		/* track inode changes */
	unsigned long flags;
	u8 digest[IMA_DIGEST_SIZE];
	struct mutex mutex;	/* protects: version, flags, digest */
	long readcount;		/* measured files readcount */
	long writecount;	/* measured files writecount */
	long opencount;		/* opens reference count */
	struct kref refcount;	/* ima_iint_cache reference count */
	struct rcu_head rcu;
};

/* LIM API function definitions */
int ima_must_measure(struct ima_iint_cache *iint, struct inode *inode,
		     int mask, int function);
int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file);
void ima_store_measurement(struct ima_iint_cache *iint, struct file *file,
			   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);

/* radix tree calls to lookup, insert, delete
 * integrity data associated with an inode.
 */
struct ima_iint_cache *ima_iint_insert(struct inode *inode);
struct ima_iint_cache *ima_iint_find_get(struct inode *inode);
struct ima_iint_cache *ima_iint_find_insert_get(struct inode *inode);
void ima_iint_delete(struct inode *inode);
void iint_free(struct kref *kref);
void iint_rcu_free(struct rcu_head *rcu);

/* IMA policy related functions */
enum ima_hooks { PATH_CHECK = 1, FILE_MMAP, BPRM_CHECK };

int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask);
void ima_init_policy(void);
void ima_update_policy(void);
int ima_parse_add_rule(char *);
void ima_delete_rules(void);

/* 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
Commit	Line	Data
3323eec9 MZ	1	/*
	2	* Copyright (C) 2005,2006,2007,2008 IBM Corporation
	3	*
	4	* Authors:
	5	* Reiner Sailer <sailer@watson.ibm.com>
	6	* Mimi Zohar <zohar@us.ibm.com>
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation, version 2 of the
	11	* License.
	12	*
	13	* File: ima.h
	14	* internal Integrity Measurement Architecture (IMA) definitions
	15	*/
	16
	17	#ifndef __LINUX_IMA_H
	18	#define __LINUX_IMA_H
	19
	20	#include <linux/types.h>
	21	#include <linux/crypto.h>
	22	#include <linux/security.h>
	23	#include <linux/hash.h>
	24	#include <linux/tpm.h>
	25	#include <linux/audit.h>
	26
	27	enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII };
	28	enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 };
	29
	30	/* digest size for IMA, fits SHA1 or MD5 */
	31	#define IMA_DIGEST_SIZE 20
	32	#define IMA_EVENT_NAME_LEN_MAX 255
	33
	34	#define IMA_HASH_BITS 9
	35	#define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
	36
	37	/* set during initialization */
	38	extern int ima_initialized;
	39	extern int ima_used_chip;
	40	extern char *ima_hash;
	41
	42	/* IMA inode template definition */
	43	struct ima_template_data {
	44	u8 digest[IMA_DIGEST_SIZE]; /* sha1/md5 measurement hash */
	45	char file_name[IMA_EVENT_NAME_LEN_MAX + 1]; /* name + \0 */
	46	};
	47
	48	struct ima_template_entry {
	49	u8 digest[IMA_DIGEST_SIZE]; /* sha1 or md5 measurement hash */
	50	char *template_name;
	51	int template_len;
	52	struct ima_template_data template;
	53	};
	54
	55	struct ima_queue_entry {
	56	struct hlist_node hnext; /* place in hash collision list */
	57	struct list_head later; /* place in ima_measurements list */
	58	struct ima_template_entry *entry;
	59	};
	60	extern struct list_head ima_measurements; /* list of all measurements */
	61
	62	/* declarations */
	63	void integrity_audit_msg(int audit_msgno, struct inode *inode,
	64	const unsigned char fname, const char op,
65	const char *cause, int result, int info);
66
67	/* Internal IMA function definitions */
68	void ima_iintcache_init(void);
69	int ima_init(void);
bab73937 MZ	70	void ima_cleanup(void);
	71	int ima_fs_init(void);
	72	void ima_fs_cleanup(void);
3323eec9 MZ	73	int ima_add_template_entry(struct ima_template_entry *entry, int violation,
	74	const char op, struct inode inode);
	75	int ima_calc_hash(struct file file, char digest);
	76	int ima_calc_template_hash(int template_len, void template, char digest);
	77	int ima_calc_boot_aggregate(char *digest);
	78	void ima_add_violation(struct inode inode, const unsigned char filename,
	79	const char op, const char cause);
	80
	81	/*
	82	* used to protect h_table and sha_table
	83	*/
	84	extern spinlock_t ima_queue_lock;
	85
	86	struct ima_h_table {
	87	atomic_long_t len; /* number of stored measurements in the list */
	88	atomic_long_t violations;
	89	struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
	90	};
	91	extern struct ima_h_table ima_htable;
	92
	93	static inline unsigned long ima_hash_key(u8 *digest)
	94	{
	95	return hash_long(*digest, IMA_HASH_BITS);
	96	}
	97
	98	/* iint cache flags */
	99	#define IMA_MEASURED 1
1df9f0a7	100	#define IMA_IINT_DUMP_STACK 512
3323eec9 MZ	101
	102	/* integrity data associated with an inode */
	103	struct ima_iint_cache {
	104	u64 version; /* track inode changes */
	105	unsigned long flags;
	106	u8 digest[IMA_DIGEST_SIZE];
	107	struct mutex mutex; /* protects: version, flags, digest */
	108	long readcount; /* measured files readcount */
	109	long writecount; /* measured files writecount */
1df9f0a7	110	long opencount; /* opens reference count */
3323eec9 MZ	111	struct kref refcount; /* ima_iint_cache reference count */
	112	struct rcu_head rcu;
	113	};
	114
	115	/* LIM API function definitions */
	116	int ima_must_measure(struct ima_iint_cache iint, struct inode inode,
	117	int mask, int function);
	118	int ima_collect_measurement(struct ima_iint_cache iint, struct file file);
	119	void ima_store_measurement(struct ima_iint_cache iint, struct file file,
	120	const unsigned char *filename);
	121	int ima_store_template(struct ima_template_entry *entry, int violation,
	122	struct inode *inode);
bab73937 MZ	123	void ima_template_show(struct seq_file m, void e,
bab73937 MZ	124	enum ima_show_type show);
3323eec9 MZ	125
	126	/* radix tree calls to lookup, insert, delete
	127	* integrity data associated with an inode.
	128	*/
	129	struct ima_iint_cache ima_iint_insert(struct inode inode);
	130	struct ima_iint_cache ima_iint_find_get(struct inode inode);
	131	struct ima_iint_cache ima_iint_find_insert_get(struct inode inode);
	132	void ima_iint_delete(struct inode *inode);
	133	void iint_free(struct kref *kref);
	134	void iint_rcu_free(struct rcu_head *rcu);
	135
	136	/* IMA policy related functions */
	137	enum ima_hooks { PATH_CHECK = 1, FILE_MMAP, BPRM_CHECK };
	138
	139	int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask);
	140	void ima_init_policy(void);
	141	void ima_update_policy(void);
4af4662f MZ	142	int ima_parse_add_rule(char *);
	143	void ima_delete_rules(void);
	144
	145	/* LSM based policy rules require audit */
	146	#ifdef CONFIG_IMA_LSM_RULES
	147
	148	#define security_filter_rule_init security_audit_rule_init
	149	#define security_filter_rule_match security_audit_rule_match
	150
	151	#else
	152
	153	static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
	154	void **lsmrule)
	155	{
	156	return -EINVAL;
	157	}
	158
	159	static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
	160	void *lsmrule,
	161	struct audit_context *actx)
	162	{
	163	return -EINVAL;
	164	}
	165	#endif /* CONFIG_IMA_LSM_RULES */
3323eec9	166	#endif