/*

 * ima-evm-utils - IMA/EVM support utilities

 *

 * Copyright (C) 2011 Nokia Corporation

 * Copyright (C) 2011,2012,2013 Intel Corporation

 * Copyright (C) 2013,2014 Samsung Electronics

 *

 * Authors:

 * Dmitry Kasatkin <dmitry.kasatkin@nokia.com>

 *                 <dmitry.kasatkin@intel.com>

 *                 <d.kasatkin@samsung.com>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * version 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 *

 * As a special exception, the copyright holders give permission to link the

 * code of portions of this program with the OpenSSL library under certain

 * conditions as described in each individual source file and distribute

 * linked combinations including the program with the OpenSSL library. You

 * must comply with the GNU General Public License in all respects

 * for all of the code used other than as permitted herein. If you modify

 * file(s) with this exception, you may extend this exception to your

 * version of the file(s), but you are not obligated to do so. If you do not

 * wish to do so, delete this exception statement from your version. If you

 * delete this exception statement from all source files in the program,

 * then also delete it in the license file.

 *

 * File: imaevm.h

 *	 IMA/EVM header file

 */

#ifndef _LIBIMAEVM_H

#define _LIBIMAEVM_H

#include <linux/fs.h>

#include <stdint.h>

#include <syslog.h>

#include <stdbool.h>

#include <errno.h>

#include <openssl/rsa.h>

#ifdef USE_FPRINTF

#define do_log(level, fmt, args...)	({ if (level <= params.verbose) fprintf(stderr, fmt, ##args); })

#define do_log_dump(level, p, len, cr)	({ if (level <= params.verbose) do_dump(stderr, p, len, cr); })

#else

#define do_log(level, fmt, args...)	syslog(level, fmt, ##args)

#define do_log_dump(level, p, len, cr)

#endif

#ifdef DEBUG

#define log_debug(fmt, args...)		do_log(LOG_DEBUG, "%s:%d " fmt, __func__ , __LINE__ , ##args)

#define log_debug_dump(p, len)		do_log_dump(LOG_DEBUG, p, len, true)

#define log_debug_dump_n(p, len)	do_log_dump(LOG_DEBUG, p, len, false)

#else

#define log_debug(fmt, args...)

#define log_debug_dump(p, len)

#endif

#define log_dump(p, len)		do_log_dump(LOG_INFO, p, len, true)

#define log_dump_n(p, len)		do_log_dump(LOG_INFO, p, len, false)

#define log_info(fmt, args...)		do_log(LOG_INFO, fmt, ##args)

#define log_err(fmt, args...)		do_log(LOG_ERR, fmt, ##args)

#define log_errno(fmt, args...)		do_log(LOG_ERR, fmt ": errno: %s (%d)\n", ##args, strerror(errno), errno)

#define	DATA_SIZE	4096

#define SHA1_HASH_LEN   20

#define __packed __attribute__((packed))

enum evm_ima_xattr_type {

	IMA_XATTR_DIGEST = 0x01,

	EVM_XATTR_HMAC,

	EVM_IMA_XATTR_DIGSIG,

	IMA_XATTR_DIGEST_NG,

	EVM_XATTR_PORTABLE_DIGSIG,

};

struct h_misc {

	unsigned long ino;

	uint32_t generation;

	uid_t uid;

	gid_t gid;

	unsigned short mode;

};

struct h_misc_32 {

	uint32_t ino;

	uint32_t generation;

	uid_t uid;

	gid_t gid;

	unsigned short mode;

};

struct h_misc_64 {

	uint64_t ino;

	uint32_t generation;

	uid_t uid;

	gid_t gid;

	unsigned short mode;

};

struct h_misc_digsig {

	uid_t uid;

	gid_t gid;

	unsigned short mode;

};

enum pubkey_algo {

	PUBKEY_ALGO_RSA,

	PUBKEY_ALGO_MAX,

};

enum digest_algo {

	DIGEST_ALGO_SHA1,

	DIGEST_ALGO_SHA256,

	DIGEST_ALGO_MAX

};

enum digsig_version {

	DIGSIG_VERSION_1 = 1,

	DIGSIG_VERSION_2

};

struct pubkey_hdr {

	uint8_t version;	/* key format version */

	uint32_t timestamp;	/* key made, always 0 for now */

	uint8_t algo;

	uint8_t nmpi;

	char mpi[0];

} __packed;

struct signature_hdr {

	uint8_t version;	/* signature format version */

	uint32_t timestamp;	/* signature made */

	uint8_t algo;

	uint8_t hash;

	uint8_t keyid[8];

	uint8_t nmpi;

	char mpi[0];

} __packed;

enum pkey_hash_algo {

	PKEY_HASH_MD4,

	PKEY_HASH_MD5,

	PKEY_HASH_SHA1,

	PKEY_HASH_RIPE_MD_160,

	PKEY_HASH_SHA256,

	PKEY_HASH_SHA384,

	PKEY_HASH_SHA512,

	PKEY_HASH_SHA224,

	PKEY_HASH__LAST

};

/*

 * signature format v2 - for using with asymmetric keys

 */

struct signature_v2_hdr {

	uint8_t version;	/* signature format version */

	uint8_t	hash_algo;	/* Digest algorithm [enum pkey_hash_algo] */

	uint32_t keyid;		/* IMA key identifier - not X509/PGP specific*/

	uint16_t sig_size;	/* signature size */

	uint8_t sig[0];		/* signature payload */

} __packed;

typedef int (*verify_hash_fn_t)(const char *file, const unsigned char *hash, int size, unsigned char *sig, int siglen, const char *keyfile);

struct libevm_params {

	int verbose;

	int x509;

	const char *hash_algo;

	const char *keyfile;

	const char *keypass;

};

struct RSA_ASN1_template {

	const uint8_t *data;

	size_t size;

};

#define	NUM_PCRS 20

#define DEFAULT_PCR 10

extern const struct RSA_ASN1_template RSA_ASN1_templates[PKEY_HASH__LAST];

extern struct libevm_params params;

void do_dump(FILE *fp, const void *ptr, int len, bool cr);

void dump(const void *ptr, int len);

int get_filesize(const char *filename);

int ima_calc_hash(const char *file, uint8_t *hash);

int get_hash_algo(const char *algo);

RSA *read_pub_key(const char *keyfile, int x509);

void calc_keyid_v1(uint8_t *keyid, char *str, const unsigned char *pkey, int len);

void calc_keyid_v2(uint32_t *keyid, char *str, RSA *key);

int key2bin(RSA *key, unsigned char *pub);

int sign_hash(const char *algo, const unsigned char *hash, int size, const char *keyfile, const char *keypass, unsigned char *sig);

int verify_hash(const char *file, const unsigned char *hash, int size, unsigned char *sig, int siglen);

int ima_verify_signature(const char *file, unsigned char *sig, int siglen, unsigned char *digest, int digestlen);

void init_public_keys(const char *keyfiles);

#endif