[deliverable/linux.git] / security / integrity / integrity.h

/*
 * Copyright (C) 2009-2010 IBM Corporation
 *
 * Authors:
 * 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.
 *
 */

#include <linux/types.h>
#include <linux/integrity.h>
#include <crypto/sha.h>

/* iint cache flags */
#define IMA_MEASURED		0x01

enum evm_ima_xattr_type {
	IMA_XATTR_DIGEST = 0x01,
	EVM_XATTR_HMAC,
	EVM_IMA_XATTR_DIGSIG,
};

struct evm_ima_xattr_data {
	u8 type;
	u8 digest[SHA1_DIGEST_SIZE];
}  __attribute__((packed));

/* integrity data associated with an inode */
struct integrity_iint_cache {
	struct rb_node rb_node; /* rooted in integrity_iint_tree */
	struct inode *inode;	/* back pointer to inode in question */
	u64 version;		/* track inode changes */
	unsigned char flags;
	u8 digest[SHA1_DIGEST_SIZE];
	struct mutex mutex;	/* protects: version, flags, digest */
	enum integrity_status evm_status;
};

/* 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);

#define INTEGRITY_KEYRING_EVM		0
#define INTEGRITY_KEYRING_MODULE	1
#define INTEGRITY_KEYRING_IMA		2
#define INTEGRITY_KEYRING_MAX		3

#ifdef CONFIG_INTEGRITY_DIGSIG

int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
					const char *digest, int digestlen);

#else

static inline int integrity_digsig_verify(const unsigned int id,
					  const char *sig, int siglen,
					  const char *digest, int digestlen)
{
	return -EOPNOTSUPP;
}

#endif /* CONFIG_INTEGRITY_DIGSIG */

/* set during initialization */
extern int iint_initialized;
Commit	Line	Data
f381c272 MZ	1	/*
	2	* Copyright (C) 2009-2010 IBM Corporation
	3	*
	4	* Authors:
	5	* Mimi Zohar <zohar@us.ibm.com>
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License as
	9	* published by the Free Software Foundation, version 2 of the
	10	* License.
	11	*
	12	*/
	13
	14	#include <linux/types.h>
	15	#include <linux/integrity.h>
	16	#include <crypto/sha.h>
	17
	18	/* iint cache flags */
	19	#define IMA_MEASURED 0x01
	20
6be5cc52 DK	21	enum evm_ima_xattr_type {
	22	IMA_XATTR_DIGEST = 0x01,
	23	EVM_XATTR_HMAC,
	24	EVM_IMA_XATTR_DIGSIG,
	25	};
	26
	27	struct evm_ima_xattr_data {
	28	u8 type;
	29	u8 digest[SHA1_DIGEST_SIZE];
	30	} __attribute__((packed));
	31
f381c272 MZ	32	/* integrity data associated with an inode */
	33	struct integrity_iint_cache {
	34	struct rb_node rb_node; /* rooted in integrity_iint_tree */
	35	struct inode inode; / back pointer to inode in question */
	36	u64 version; /* track inode changes */
	37	unsigned char flags;
	38	u8 digest[SHA1_DIGEST_SIZE];
	39	struct mutex mutex; /* protects: version, flags, digest */
24e0198e	40	enum integrity_status evm_status;
f381c272 MZ	41	};
	42
	43	/* rbtree tree calls to lookup, insert, delete
	44	* integrity data associated with an inode.
	45	*/
	46	struct integrity_iint_cache integrity_iint_insert(struct inode inode);
	47	struct integrity_iint_cache integrity_iint_find(struct inode inode);
4892722e	48
8607c501 DK	49	#define INTEGRITY_KEYRING_EVM 0
	50	#define INTEGRITY_KEYRING_MODULE 1
	51	#define INTEGRITY_KEYRING_IMA 2
	52	#define INTEGRITY_KEYRING_MAX 3
	53
	54	#ifdef CONFIG_INTEGRITY_DIGSIG
	55
	56	int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
	57	const char *digest, int digestlen);
	58
	59	#else
	60
	61	static inline int integrity_digsig_verify(const unsigned int id,
	62	const char *sig, int siglen,
	63	const char *digest, int digestlen)
	64	{
	65	return -EOPNOTSUPP;
	66	}
	67
	68	#endif /* CONFIG_INTEGRITY_DIGSIG */
	69
4892722e JM	70	/* set during initialization */
4892722e JM	71	extern int iint_initialized;