[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>
#include <linux/key.h>

/* iint action cache flags */
#define IMA_MEASURE		0x00000001
#define IMA_MEASURED		0x00000002
#define IMA_APPRAISE		0x00000004
#define IMA_APPRAISED		0x00000008
/*#define IMA_COLLECT		0x00000010  do not use this flag */
#define IMA_COLLECTED		0x00000020
#define IMA_AUDIT		0x00000040
#define IMA_AUDITED		0x00000080

/* iint cache flags */
#define IMA_ACTION_FLAGS	0xff000000
#define IMA_DIGSIG		0x01000000
#define IMA_DIGSIG_REQUIRED	0x02000000

#define IMA_DO_MASK		(IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
				 IMA_APPRAISE_SUBMASK)
#define IMA_DONE_MASK		(IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
				 IMA_COLLECTED | IMA_APPRAISED_SUBMASK)

/* iint subaction appraise cache flags */
#define IMA_FILE_APPRAISE	0x00000100
#define IMA_FILE_APPRAISED	0x00000200
#define IMA_MMAP_APPRAISE	0x00000400
#define IMA_MMAP_APPRAISED	0x00000800
#define IMA_BPRM_APPRAISE	0x00001000
#define IMA_BPRM_APPRAISED	0x00002000
#define IMA_MODULE_APPRAISE	0x00004000
#define IMA_MODULE_APPRAISED	0x00008000
#define IMA_APPRAISE_SUBMASK	(IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
				 IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE)
#define IMA_APPRAISED_SUBMASK	(IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
				 IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED)

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 long flags;
	struct evm_ima_xattr_data ima_xattr;
	enum integrity_status ima_file_status:4;
	enum integrity_status ima_mmap_status:4;
	enum integrity_status ima_bprm_status:4;
	enum integrity_status ima_module_status:4;
	enum integrity_status evm_status:4;
};

/* 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_SIGNATURE

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_SIGNATURE */

#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
int asymmetric_verify(struct key *keyring, const char *sig,
		      int siglen, const char *data, int datalen);
#else
static inline int asymmetric_verify(struct key *keyring, const char *sig,
				    int siglen, const char *data, int datalen)
{
	return -EOPNOTSUPP;
}
#endif

#ifdef CONFIG_INTEGRITY_AUDIT
/* 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);
#else
static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
				       const unsigned char *fname,
				       const char *op, const char *cause,
				       int result, int info)
{
}
#endif

/* 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>
e0751257	17	#include <linux/key.h>
f381c272	18
45e2472e	19	/* iint action cache flags */
f578c08e MZ	20	#define IMA_MEASURE 0x00000001
	21	#define IMA_MEASURED 0x00000002
	22	#define IMA_APPRAISE 0x00000004
	23	#define IMA_APPRAISED 0x00000008
	24	/#define IMA_COLLECT 0x00000010 do not use this flag /
	25	#define IMA_COLLECTED 0x00000020
	26	#define IMA_AUDIT 0x00000040
	27	#define IMA_AUDITED 0x00000080
45e2472e	28
f381c272	29	/* iint cache flags */
f578c08e MZ	30	#define IMA_ACTION_FLAGS 0xff000000
	31	#define IMA_DIGSIG 0x01000000
	32	#define IMA_DIGSIG_REQUIRED 0x02000000
45e2472e	33
d79d72e0 MZ	34	#define IMA_DO_MASK (IMA_MEASURE \| IMA_APPRAISE \| IMA_AUDIT \| \
	35	IMA_APPRAISE_SUBMASK)
	36	#define IMA_DONE_MASK (IMA_MEASURED \| IMA_APPRAISED \| IMA_AUDITED \| \
	37	IMA_COLLECTED \| IMA_APPRAISED_SUBMASK)
	38
	39	/* iint subaction appraise cache flags */
	40	#define IMA_FILE_APPRAISE 0x00000100
	41	#define IMA_FILE_APPRAISED 0x00000200
	42	#define IMA_MMAP_APPRAISE 0x00000400
	43	#define IMA_MMAP_APPRAISED 0x00000800
	44	#define IMA_BPRM_APPRAISE 0x00001000
	45	#define IMA_BPRM_APPRAISED 0x00002000
	46	#define IMA_MODULE_APPRAISE 0x00004000
	47	#define IMA_MODULE_APPRAISED 0x00008000
	48	#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE \| IMA_MMAP_APPRAISE \| \
	49	IMA_BPRM_APPRAISE \| IMA_MODULE_APPRAISE)
	50	#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED \| IMA_MMAP_APPRAISED \| \
	51	IMA_BPRM_APPRAISED \| IMA_MODULE_APPRAISED)
f381c272	52
6be5cc52 DK	53	enum evm_ima_xattr_type {
	54	IMA_XATTR_DIGEST = 0x01,
	55	EVM_XATTR_HMAC,
	56	EVM_IMA_XATTR_DIGSIG,
	57	};
	58
	59	struct evm_ima_xattr_data {
	60	u8 type;
	61	u8 digest[SHA1_DIGEST_SIZE];
	62	} __attribute__((packed));
	63
f381c272 MZ	64	/* integrity data associated with an inode */
	65	struct integrity_iint_cache {
	66	struct rb_node rb_node; /* rooted in integrity_iint_tree */
	67	struct inode inode; / back pointer to inode in question */
	68	u64 version; /* track inode changes */
f578c08e	69	unsigned long flags;
5a44b412	70	struct evm_ima_xattr_data ima_xattr;
d79d72e0 MZ	71	enum integrity_status ima_file_status:4;
	72	enum integrity_status ima_mmap_status:4;
	73	enum integrity_status ima_bprm_status:4;
	74	enum integrity_status ima_module_status:4;
ee866331	75	enum integrity_status evm_status:4;
f381c272 MZ	76	};
	77
	78	/* rbtree tree calls to lookup, insert, delete
	79	* integrity data associated with an inode.
	80	*/
	81	struct integrity_iint_cache integrity_iint_insert(struct inode inode);
	82	struct integrity_iint_cache integrity_iint_find(struct inode inode);
4892722e	83
8607c501 DK	84	#define INTEGRITY_KEYRING_EVM 0
	85	#define INTEGRITY_KEYRING_MODULE 1
	86	#define INTEGRITY_KEYRING_IMA 2
	87	#define INTEGRITY_KEYRING_MAX 3
	88
f1be242c	89	#ifdef CONFIG_INTEGRITY_SIGNATURE
8607c501 DK	90
	91	int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
	92	const char *digest, int digestlen);
	93
	94	#else
	95
	96	static inline int integrity_digsig_verify(const unsigned int id,
	97	const char *sig, int siglen,
	98	const char *digest, int digestlen)
	99	{
	100	return -EOPNOTSUPP;
	101	}
	102
f1be242c	103	#endif /* CONFIG_INTEGRITY_SIGNATURE */
8607c501	104
e0751257 DK	105	#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
	106	int asymmetric_verify(struct key keyring, const char sig,
	107	int siglen, const char *data, int datalen);
	108	#else
	109	static inline int asymmetric_verify(struct key keyring, const char sig,
	110	int siglen, const char *data, int datalen)
	111	{
	112	return -EOPNOTSUPP;
	113	}
	114	#endif
	115
d726d8d7 MZ	116	#ifdef CONFIG_INTEGRITY_AUDIT
	117	/* declarations */
	118	void integrity_audit_msg(int audit_msgno, struct inode *inode,
	119	const unsigned char fname, const char op,
	120	const char *cause, int result, int info);
	121	#else
	122	static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
	123	const unsigned char *fname,
	124	const char op, const char cause,
	125	int result, int info)
	126	{
	127	}
	128	#endif
	129
4892722e JM	130	/* set during initialization */
4892722e JM	131	extern int iint_initialized;