[linux-2.6-block.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_PERMIT_DIRECTIO	0x04000000
#define IMA_NEW_FILE		0x08000000

#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_FIRMWARE_APPRAISE	0x00010000
#define IMA_FIRMWARE_APPRAISED	0x00020000
#define IMA_APPRAISE_SUBMASK	(IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
				 IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE | \
				 IMA_FIRMWARE_APPRAISE)
#define IMA_APPRAISED_SUBMASK	(IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
				 IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED | \
				 IMA_FIRMWARE_APPRAISED)

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

struct evm_ima_xattr_data {
	u8 type;
	u8 digest[SHA1_DIGEST_SIZE];
} __packed;

#define IMA_MAX_DIGEST_SIZE	64

struct ima_digest_data {
	u8 algo;
	u8 length;
	union {
		struct {
			u8 unused;
			u8 type;
		} sha1;
		struct {
			u8 type;
			u8 algo;
		} ng;
		u8 data[2];
	} xattr;
	u8 digest[0];
} __packed;

/*
 * signature format v2 - for using with asymmetric keys
 */
struct signature_v2_hdr {
	uint8_t type;		/* xattr type */
	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;

/* 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;
	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 ima_firmware_status:4;
	enum integrity_status evm_status:4;
	struct ima_digest_data *ima_hash;
};

/* 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);

int integrity_init_keyring(const unsigned int id);
#else

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

static inline int integrity_init_keyring(const unsigned int id)
{
	return 0;
}
#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
f9b2a735	33	#define IMA_PERMIT_DIRECTIO 0x04000000
b151d6b0	34	#define IMA_NEW_FILE 0x08000000
45e2472e	35
d79d72e0 MZ	36	#define IMA_DO_MASK (IMA_MEASURE \| IMA_APPRAISE \| IMA_AUDIT \| \
	37	IMA_APPRAISE_SUBMASK)
	38	#define IMA_DONE_MASK (IMA_MEASURED \| IMA_APPRAISED \| IMA_AUDITED \| \
	39	IMA_COLLECTED \| IMA_APPRAISED_SUBMASK)
	40
	41	/* iint subaction appraise cache flags */
	42	#define IMA_FILE_APPRAISE 0x00000100
	43	#define IMA_FILE_APPRAISED 0x00000200
	44	#define IMA_MMAP_APPRAISE 0x00000400
	45	#define IMA_MMAP_APPRAISED 0x00000800
	46	#define IMA_BPRM_APPRAISE 0x00001000
	47	#define IMA_BPRM_APPRAISED 0x00002000
	48	#define IMA_MODULE_APPRAISE 0x00004000
	49	#define IMA_MODULE_APPRAISED 0x00008000
5a9196d7 MZ	50	#define IMA_FIRMWARE_APPRAISE 0x00010000
5a9196d7 MZ	51	#define IMA_FIRMWARE_APPRAISED 0x00020000
d79d72e0	52	#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE \| IMA_MMAP_APPRAISE \| \
5a9196d7 MZ	53	IMA_BPRM_APPRAISE \| IMA_MODULE_APPRAISE \| \
5a9196d7 MZ	54	IMA_FIRMWARE_APPRAISE)
d79d72e0	55	#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED \| IMA_MMAP_APPRAISED \| \
5a9196d7 MZ	56	IMA_BPRM_APPRAISED \| IMA_MODULE_APPRAISED \| \
5a9196d7 MZ	57	IMA_FIRMWARE_APPRAISED)
f381c272	58
6be5cc52 DK	59	enum evm_ima_xattr_type {
	60	IMA_XATTR_DIGEST = 0x01,
	61	EVM_XATTR_HMAC,
	62	EVM_IMA_XATTR_DIGSIG,
3ea7a560	63	IMA_XATTR_DIGEST_NG,
6be5cc52 DK	64	};
	65
	66	struct evm_ima_xattr_data {
	67	u8 type;
	68	u8 digest[SHA1_DIGEST_SIZE];
c7c8bb23 DK	69	} __packed;
	70
	71	#define IMA_MAX_DIGEST_SIZE 64
	72
	73	struct ima_digest_data {
	74	u8 algo;
	75	u8 length;
3ea7a560 DK	76	union {
	77	struct {
	78	u8 unused;
	79	u8 type;
	80	} sha1;
	81	struct {
	82	u8 type;
	83	u8 algo;
	84	} ng;
	85	u8 data[2];
	86	} xattr;
a35c3fb6	87	u8 digest[0];
c7c8bb23	88	} __packed;
6be5cc52	89
d3634d0f DK	90	/*
	91	* signature format v2 - for using with asymmetric keys
	92	*/
	93	struct signature_v2_hdr {
b1aaab22	94	uint8_t type; /* xattr type */
d3634d0f DK	95	uint8_t version; /* signature format version */
	96	uint8_t hash_algo; /* Digest algorithm [enum pkey_hash_algo] */
	97	uint32_t keyid; /* IMA key identifier - not X509/PGP specific */
	98	uint16_t sig_size; /* signature size */
	99	uint8_t sig[0]; /* signature payload */
	100	} __packed;
	101
f381c272 MZ	102	/* integrity data associated with an inode */
f381c272 MZ	103	struct integrity_iint_cache {
c7c8bb23	104	struct rb_node rb_node; /* rooted in integrity_iint_tree */
f381c272 MZ	105	struct inode inode; / back pointer to inode in question */
f381c272 MZ	106	u64 version; /* track inode changes */
f578c08e	107	unsigned long flags;
d79d72e0 MZ	108	enum integrity_status ima_file_status:4;
	109	enum integrity_status ima_mmap_status:4;
	110	enum integrity_status ima_bprm_status:4;
	111	enum integrity_status ima_module_status:4;
5a9196d7	112	enum integrity_status ima_firmware_status:4;
ee866331	113	enum integrity_status evm_status:4;
a35c3fb6	114	struct ima_digest_data *ima_hash;
f381c272 MZ	115	};
	116
	117	/* rbtree tree calls to lookup, insert, delete
	118	* integrity data associated with an inode.
	119	*/
	120	struct integrity_iint_cache integrity_iint_insert(struct inode inode);
	121	struct integrity_iint_cache integrity_iint_find(struct inode inode);
4892722e	122
8607c501 DK	123	#define INTEGRITY_KEYRING_EVM 0
	124	#define INTEGRITY_KEYRING_MODULE 1
	125	#define INTEGRITY_KEYRING_IMA 2
	126	#define INTEGRITY_KEYRING_MAX 3
	127
f1be242c	128	#ifdef CONFIG_INTEGRITY_SIGNATURE
8607c501 DK	129
8607c501 DK	130	int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
089bc8e9	131	const char *digest, int digestlen);
8607c501	132
7d2ce232	133	int integrity_init_keyring(const unsigned int id);
8607c501 DK	134	#else
	135
	136	static inline int integrity_digsig_verify(const unsigned int id,
	137	const char *sig, int siglen,
	138	const char *digest, int digestlen)
	139	{
	140	return -EOPNOTSUPP;
	141	}
	142
7d2ce232 MZ	143	static inline int integrity_init_keyring(const unsigned int id)
	144	{
	145	return 0;
	146	}
f1be242c	147	#endif /* CONFIG_INTEGRITY_SIGNATURE */
8607c501	148
e0751257 DK	149	#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
	150	int asymmetric_verify(struct key keyring, const char sig,
	151	int siglen, const char *data, int datalen);
	152	#else
	153	static inline int asymmetric_verify(struct key keyring, const char sig,
	154	int siglen, const char *data, int datalen)
	155	{
	156	return -EOPNOTSUPP;
	157	}
	158	#endif
	159
d726d8d7 MZ	160	#ifdef CONFIG_INTEGRITY_AUDIT
	161	/* declarations */
	162	void integrity_audit_msg(int audit_msgno, struct inode *inode,
	163	const unsigned char fname, const char op,
	164	const char *cause, int result, int info);
	165	#else
	166	static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
	167	const unsigned char *fname,
	168	const char op, const char cause,
	169	int result, int info)
	170	{
	171	}
	172	#endif
	173
4892722e JM	174	/* set during initialization */
4892722e JM	175	extern int iint_initialized;