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

/*
 * Copyright (C) 2009-2010 IBM Corporation
 *
 * Authors:
 * Mimi Zohar <[email protected]>
 *
 * 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,
	IMA_XATTR_LAST
};

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_find(struct inode *inode);

int integrity_kernel_read(struct file *file, loff_t offset,
			  char *addr, unsigned long count);
int __init integrity_read_file(const char *path, char **data);

#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 __init integrity_init_keyring(const unsigned int id);
int __init integrity_load_x509(const unsigned int id, char *path);
#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_IMA_LOAD_X509
void __init ima_load_x509(void);
#else
static inline void ima_load_x509(void)
{
}
#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
Commit	Line	Data
f381c272 MZ	1	/*
	2	* Copyright (C) 2009-2010 IBM Corporation
	3	*
	4	* Authors:
	5	* Mimi Zohar <[email protected]>
	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,
a48fda9d	64	IMA_XATTR_LAST
6be5cc52 DK	65	};
	66
	67	struct evm_ima_xattr_data {
	68	u8 type;
	69	u8 digest[SHA1_DIGEST_SIZE];
c7c8bb23 DK	70	} __packed;
	71
	72	#define IMA_MAX_DIGEST_SIZE 64
	73
	74	struct ima_digest_data {
	75	u8 algo;
	76	u8 length;
3ea7a560 DK	77	union {
	78	struct {
	79	u8 unused;
	80	u8 type;
	81	} sha1;
	82	struct {
	83	u8 type;
	84	u8 algo;
	85	} ng;
	86	u8 data[2];
	87	} xattr;
a35c3fb6	88	u8 digest[0];
c7c8bb23	89	} __packed;
6be5cc52	90
d3634d0f DK	91	/*
	92	* signature format v2 - for using with asymmetric keys
	93	*/
	94	struct signature_v2_hdr {
b1aaab22	95	uint8_t type; /* xattr type */
d3634d0f DK	96	uint8_t version; /* signature format version */
	97	uint8_t hash_algo; /* Digest algorithm [enum pkey_hash_algo] */
	98	uint32_t keyid; /* IMA key identifier - not X509/PGP specific */
	99	uint16_t sig_size; /* signature size */
	100	uint8_t sig[0]; /* signature payload */
	101	} __packed;
	102
f381c272 MZ	103	/* integrity data associated with an inode */
f381c272 MZ	104	struct integrity_iint_cache {
c7c8bb23	105	struct rb_node rb_node; /* rooted in integrity_iint_tree */
f381c272 MZ	106	struct inode inode; / back pointer to inode in question */
f381c272 MZ	107	u64 version; /* track inode changes */
f578c08e	108	unsigned long flags;
d79d72e0 MZ	109	enum integrity_status ima_file_status:4;
	110	enum integrity_status ima_mmap_status:4;
	111	enum integrity_status ima_bprm_status:4;
	112	enum integrity_status ima_module_status:4;
5a9196d7	113	enum integrity_status ima_firmware_status:4;
ee866331	114	enum integrity_status evm_status:4;
a35c3fb6	115	struct ima_digest_data *ima_hash;
f381c272 MZ	116	};
	117
	118	/* rbtree tree calls to lookup, insert, delete
	119	* integrity data associated with an inode.
	120	*/
f381c272	121	struct integrity_iint_cache integrity_iint_find(struct inode inode);
4892722e	122
e3c4abbf DK	123	int integrity_kernel_read(struct file *file, loff_t offset,
	124	char *addr, unsigned long count);
	125	int __init integrity_read_file(const char path, char *data);
	126
8607c501 DK	127	#define INTEGRITY_KEYRING_EVM 0
	128	#define INTEGRITY_KEYRING_MODULE 1
	129	#define INTEGRITY_KEYRING_IMA 2
	130	#define INTEGRITY_KEYRING_MAX 3
	131
f1be242c	132	#ifdef CONFIG_INTEGRITY_SIGNATURE
8607c501 DK	133
8607c501 DK	134	int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
089bc8e9	135	const char *digest, int digestlen);
8607c501	136
d16a8585	137	int __init integrity_init_keyring(const unsigned int id);
65d543b2	138	int __init integrity_load_x509(const unsigned int id, char *path);
8607c501 DK	139	#else
	140
	141	static inline int integrity_digsig_verify(const unsigned int id,
	142	const char *sig, int siglen,
	143	const char *digest, int digestlen)
	144	{
	145	return -EOPNOTSUPP;
	146	}
	147
7d2ce232 MZ	148	static inline int integrity_init_keyring(const unsigned int id)
	149	{
	150	return 0;
	151	}
65d543b2	152
f1be242c	153	#endif /* CONFIG_INTEGRITY_SIGNATURE */
8607c501	154
e0751257 DK	155	#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
	156	int asymmetric_verify(struct key keyring, const char sig,
	157	int siglen, const char *data, int datalen);
	158	#else
	159	static inline int asymmetric_verify(struct key keyring, const char sig,
	160	int siglen, const char *data, int datalen)
	161	{
	162	return -EOPNOTSUPP;
	163	}
	164	#endif
	165
fd5f4e90 DK	166	#ifdef CONFIG_IMA_LOAD_X509
	167	void __init ima_load_x509(void);
	168	#else
	169	static inline void ima_load_x509(void)
	170	{
	171	}
	172	#endif
	173
d726d8d7 MZ	174	#ifdef CONFIG_INTEGRITY_AUDIT
	175	/* declarations */
	176	void integrity_audit_msg(int audit_msgno, struct inode *inode,
	177	const unsigned char fname, const char op,
	178	const char *cause, int result, int info);
	179	#else
	180	static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
	181	const unsigned char *fname,
	182	const char op, const char cause,
	183	int result, int info)
	184	{
	185	}
	186	#endif