[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_ACTION_RULE_FLAGS	0x06000000
#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_READ_APPRAISE	0x00004000
#define IMA_READ_APPRAISED	0x00008000
#define IMA_APPRAISE_SUBMASK	(IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
				 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE)
#define IMA_APPRAISED_SUBMASK	(IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
				 IMA_BPRM_APPRAISED | IMA_READ_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 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;
	unsigned long measured_pcrs;
	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_read_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_IMA		1
#define INTEGRITY_KEYRING_MODULE	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, const 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_EVM_LOAD_X509
void __init evm_load_x509(void);
#else
static inline void evm_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
	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	#include <linux/key.h>
	18
	19	/* iint action cache flags */
	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
	28
	29	/* iint cache flags */
	30	#define IMA_ACTION_FLAGS 0xff000000
	31	#define IMA_ACTION_RULE_FLAGS 0x06000000
	32	#define IMA_DIGSIG 0x01000000
	33	#define IMA_DIGSIG_REQUIRED 0x02000000
	34	#define IMA_PERMIT_DIRECTIO 0x04000000
	35	#define IMA_NEW_FILE 0x08000000
	36
	37	#define IMA_DO_MASK (IMA_MEASURE \| IMA_APPRAISE \| IMA_AUDIT \| \
	38	IMA_APPRAISE_SUBMASK)
	39	#define IMA_DONE_MASK (IMA_MEASURED \| IMA_APPRAISED \| IMA_AUDITED \| \
	40	IMA_COLLECTED \| IMA_APPRAISED_SUBMASK)
	41
	42	/* iint subaction appraise cache flags */
	43	#define IMA_FILE_APPRAISE 0x00000100
	44	#define IMA_FILE_APPRAISED 0x00000200
	45	#define IMA_MMAP_APPRAISE 0x00000400
	46	#define IMA_MMAP_APPRAISED 0x00000800
	47	#define IMA_BPRM_APPRAISE 0x00001000
	48	#define IMA_BPRM_APPRAISED 0x00002000
	49	#define IMA_READ_APPRAISE 0x00004000
	50	#define IMA_READ_APPRAISED 0x00008000
	51	#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE \| IMA_MMAP_APPRAISE \| \
	52	IMA_BPRM_APPRAISE \| IMA_READ_APPRAISE)
	53	#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED \| IMA_MMAP_APPRAISED \| \
	54	IMA_BPRM_APPRAISED \| IMA_READ_APPRAISED)
	55
	56	enum evm_ima_xattr_type {
	57	IMA_XATTR_DIGEST = 0x01,
	58	EVM_XATTR_HMAC,
	59	EVM_IMA_XATTR_DIGSIG,
	60	IMA_XATTR_DIGEST_NG,
	61	IMA_XATTR_LAST
	62	};
	63
	64	struct evm_ima_xattr_data {
	65	u8 type;
	66	u8 digest[SHA1_DIGEST_SIZE];
	67	} __packed;
	68
	69	#define IMA_MAX_DIGEST_SIZE 64
	70
	71	struct ima_digest_data {
	72	u8 algo;
	73	u8 length;
	74	union {
	75	struct {
	76	u8 unused;
	77	u8 type;
	78	} sha1;
	79	struct {
	80	u8 type;
	81	u8 algo;
	82	} ng;
	83	u8 data[2];
	84	} xattr;
	85	u8 digest[0];
	86	} __packed;
	87
	88	/*
	89	* signature format v2 - for using with asymmetric keys
	90	*/
	91	struct signature_v2_hdr {
	92	uint8_t type; /* xattr type */
	93	uint8_t version; /* signature format version */
	94	uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */
	95	uint32_t keyid; /* IMA key identifier - not X509/PGP specific */
	96	uint16_t sig_size; /* signature size */
	97	uint8_t sig[0]; /* signature payload */
	98	} __packed;
	99
	100	/* integrity data associated with an inode */
	101	struct integrity_iint_cache {
	102	struct rb_node rb_node; /* rooted in integrity_iint_tree */
	103	struct inode inode; / back pointer to inode in question */
	104	u64 version; /* track inode changes */
	105	unsigned long flags;
	106	unsigned long measured_pcrs;
	107	enum integrity_status ima_file_status:4;
	108	enum integrity_status ima_mmap_status:4;
	109	enum integrity_status ima_bprm_status:4;
	110	enum integrity_status ima_read_status:4;
	111	enum integrity_status evm_status:4;
	112	struct ima_digest_data *ima_hash;
	113	};
	114
	115	/* rbtree tree calls to lookup, insert, delete
	116	* integrity data associated with an inode.
	117	*/
	118	struct integrity_iint_cache integrity_iint_find(struct inode inode);
	119
	120	int integrity_kernel_read(struct file *file, loff_t offset,
	121	char *addr, unsigned long count);
	122	int __init integrity_read_file(const char path, char *data);
	123
	124	#define INTEGRITY_KEYRING_EVM 0
	125	#define INTEGRITY_KEYRING_IMA 1
	126	#define INTEGRITY_KEYRING_MODULE 2
	127	#define INTEGRITY_KEYRING_MAX 3
	128
	129	#ifdef CONFIG_INTEGRITY_SIGNATURE
	130
	131	int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
	132	const char *digest, int digestlen);
	133
	134	int __init integrity_init_keyring(const unsigned int id);
	135	int __init integrity_load_x509(const unsigned int id, const char *path);
	136	#else
	137
	138	static inline int integrity_digsig_verify(const unsigned int id,
	139	const char *sig, int siglen,
	140	const char *digest, int digestlen)
	141	{
	142	return -EOPNOTSUPP;
	143	}
	144
	145	static inline int integrity_init_keyring(const unsigned int id)
	146	{
	147	return 0;
	148	}
	149	#endif /* CONFIG_INTEGRITY_SIGNATURE */
	150
	151	#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
	152	int asymmetric_verify(struct key keyring, const char sig,
	153	int siglen, const char *data, int datalen);
	154	#else
	155	static inline int asymmetric_verify(struct key keyring, const char sig,
	156	int siglen, const char *data, int datalen)
	157	{
	158	return -EOPNOTSUPP;
	159	}
	160	#endif
	161
	162	#ifdef CONFIG_IMA_LOAD_X509
	163	void __init ima_load_x509(void);
	164	#else
	165	static inline void ima_load_x509(void)
	166	{
	167	}
	168	#endif
	169
	170	#ifdef CONFIG_EVM_LOAD_X509
	171	void __init evm_load_x509(void);
	172	#else
	173	static inline void evm_load_x509(void)
	174	{
	175	}
	176	#endif
	177
	178	#ifdef CONFIG_INTEGRITY_AUDIT
	179	/* declarations */
	180	void integrity_audit_msg(int audit_msgno, struct inode *inode,
	181	const unsigned char fname, const char op,
	182	const char *cause, int result, int info);
	183	#else
	184	static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
	185	const unsigned char *fname,
	186	const char op, const char cause,
	187	int result, int info)
	188	{
	189	}
	190	#endif