[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>
#include <linux/audit.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
#define IMA_HASH		0x00000100
#define IMA_HASHED		0x00000200

/* iint cache flags */
#define IMA_ACTION_FLAGS	0xff000000
#define IMA_DIGSIG_REQUIRED	0x01000000
#define IMA_PERMIT_DIRECTIO	0x02000000
#define IMA_NEW_FILE		0x04000000
#define EVM_IMMUTABLE_DIGSIG	0x08000000
#define IMA_FAIL_UNVERIFIABLE_SIGS	0x10000000

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

/* iint subaction appraise cache flags */
#define IMA_FILE_APPRAISE	0x00001000
#define IMA_FILE_APPRAISED	0x00002000
#define IMA_MMAP_APPRAISE	0x00004000
#define IMA_MMAP_APPRAISED	0x00008000
#define IMA_BPRM_APPRAISE	0x00010000
#define IMA_BPRM_APPRAISED	0x00020000
#define IMA_READ_APPRAISE	0x00040000
#define IMA_READ_APPRAISED	0x00080000
#define IMA_CREDS_APPRAISE	0x00100000
#define IMA_CREDS_APPRAISED	0x00200000
#define IMA_APPRAISE_SUBMASK	(IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
				 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \
				 IMA_CREDS_APPRAISE)
#define IMA_APPRAISED_SUBMASK	(IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
				 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \
				 IMA_CREDS_APPRAISED)

/* iint cache atomic_flags */
#define IMA_CHANGE_XATTR	0
#define IMA_UPDATE_XATTR	1
#define IMA_CHANGE_ATTR		2
#define IMA_DIGSIG		3
#define IMA_MUST_MEASURE	4

enum evm_ima_xattr_type {
	IMA_XATTR_DIGEST = 0x01,
	EVM_XATTR_HMAC,
	EVM_IMA_XATTR_DIGSIG,
	IMA_XATTR_DIGEST_NG,
	EVM_XATTR_PORTABLE_DIGSIG,
	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] */
	__be32 keyid;		/* IMA key identifier - not X509/PGP specific */
	__be16 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 mutex mutex;	/* protects: version, flags, digest */
	struct inode *inode;	/* back pointer to inode in question */
	u64 version;		/* track inode changes */
	unsigned long flags;
	unsigned long measured_pcrs;
	unsigned long atomic_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_read_status:4;
	enum integrity_status ima_creds_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,
			  void *addr, unsigned long count);

#define INTEGRITY_KEYRING_EVM		0
#define INTEGRITY_KEYRING_IMA		1
#define INTEGRITY_KEYRING_PLATFORM	2
#define INTEGRITY_KEYRING_MAX		3

extern struct dentry *integrity_dir;

#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);
int __init integrity_load_cert(const unsigned int id, const char *source,
			       const void *data, size_t len, key_perm_t perm);
#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;
}

static inline int __init integrity_load_cert(const unsigned int id,
					     const char *source,
					     const void *data, size_t len,
					     key_perm_t perm)
{
	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);

static inline struct audit_buffer *
integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
{
	return audit_log_start(ctx, gfp_mask, type);
}

#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)
{
}

static inline struct audit_buffer *
integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
{
	return NULL;
}

#endif

#ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING
void __init add_to_platform_keyring(const char *source, const void *data,
				    size_t len);
#else
static inline void __init add_to_platform_keyring(const char *source,
						  const void *data, size_t len)
{
}
#endif
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>
2afd020a	18	#include <linux/audit.h>
f381c272	19
45e2472e	20	/* iint action cache flags */
f578c08e MZ	21	#define IMA_MEASURE 0x00000001
	22	#define IMA_MEASURED 0x00000002
	23	#define IMA_APPRAISE 0x00000004
	24	#define IMA_APPRAISED 0x00000008
	25	/#define IMA_COLLECT 0x00000010 do not use this flag /
	26	#define IMA_COLLECTED 0x00000020
	27	#define IMA_AUDIT 0x00000040
	28	#define IMA_AUDITED 0x00000080
da1b0029 MZ	29	#define IMA_HASH 0x00000100
da1b0029 MZ	30	#define IMA_HASHED 0x00000200
45e2472e	31
f381c272	32	/* iint cache flags */
f578c08e	33	#define IMA_ACTION_FLAGS 0xff000000
0d73a552 DK	34	#define IMA_DIGSIG_REQUIRED 0x01000000
	35	#define IMA_PERMIT_DIRECTIO 0x02000000
	36	#define IMA_NEW_FILE 0x04000000
	37	#define EVM_IMMUTABLE_DIGSIG 0x08000000
9e67028e	38	#define IMA_FAIL_UNVERIFIABLE_SIGS 0x10000000
45e2472e	39
d79d72e0	40	#define IMA_DO_MASK (IMA_MEASURE \| IMA_APPRAISE \| IMA_AUDIT \| \
da1b0029	41	IMA_HASH \| IMA_APPRAISE_SUBMASK)
d79d72e0	42	#define IMA_DONE_MASK (IMA_MEASURED \| IMA_APPRAISED \| IMA_AUDITED \| \
da1b0029 MZ	43	IMA_HASHED \| IMA_COLLECTED \| \
da1b0029 MZ	44	IMA_APPRAISED_SUBMASK)
d79d72e0 MZ	45
d79d72e0 MZ	46	/* iint subaction appraise cache flags */
da1b0029 MZ	47	#define IMA_FILE_APPRAISE 0x00001000
	48	#define IMA_FILE_APPRAISED 0x00002000
	49	#define IMA_MMAP_APPRAISE 0x00004000
	50	#define IMA_MMAP_APPRAISED 0x00008000
	51	#define IMA_BPRM_APPRAISE 0x00010000
	52	#define IMA_BPRM_APPRAISED 0x00020000
	53	#define IMA_READ_APPRAISE 0x00040000
	54	#define IMA_READ_APPRAISED 0x00080000
d906c10d MG	55	#define IMA_CREDS_APPRAISE 0x00100000
d906c10d MG	56	#define IMA_CREDS_APPRAISED 0x00200000
d79d72e0	57	#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE \| IMA_MMAP_APPRAISE \| \
d906c10d MG	58	IMA_BPRM_APPRAISE \| IMA_READ_APPRAISE \| \
d906c10d MG	59	IMA_CREDS_APPRAISE)
d79d72e0	60	#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED \| IMA_MMAP_APPRAISED \| \
d906c10d MG	61	IMA_BPRM_APPRAISED \| IMA_READ_APPRAISED \| \
d906c10d MG	62	IMA_CREDS_APPRAISED)
f381c272	63
0d73a552 DK	64	/* iint cache atomic_flags */
	65	#define IMA_CHANGE_XATTR 0
	66	#define IMA_UPDATE_XATTR 1
	67	#define IMA_CHANGE_ATTR 2
	68	#define IMA_DIGSIG 3
	69	#define IMA_MUST_MEASURE 4
	70
6be5cc52 DK	71	enum evm_ima_xattr_type {
	72	IMA_XATTR_DIGEST = 0x01,
	73	EVM_XATTR_HMAC,
	74	EVM_IMA_XATTR_DIGSIG,
3ea7a560	75	IMA_XATTR_DIGEST_NG,
50b97748	76	EVM_XATTR_PORTABLE_DIGSIG,
a48fda9d	77	IMA_XATTR_LAST
6be5cc52 DK	78	};
	79
	80	struct evm_ima_xattr_data {
	81	u8 type;
	82	u8 digest[SHA1_DIGEST_SIZE];
c7c8bb23 DK	83	} __packed;
	84
	85	#define IMA_MAX_DIGEST_SIZE 64
	86
	87	struct ima_digest_data {
	88	u8 algo;
	89	u8 length;
3ea7a560 DK	90	union {
	91	struct {
	92	u8 unused;
	93	u8 type;
	94	} sha1;
	95	struct {
	96	u8 type;
	97	u8 algo;
	98	} ng;
	99	u8 data[2];
	100	} xattr;
a35c3fb6	101	u8 digest[0];
c7c8bb23	102	} __packed;
6be5cc52	103
d3634d0f DK	104	/*
	105	* signature format v2 - for using with asymmetric keys
	106	*/
	107	struct signature_v2_hdr {
b1aaab22	108	uint8_t type; /* xattr type */
d3634d0f	109	uint8_t version; /* signature format version */
4e8ae72a	110	uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */
bb543e39 TJB	111	__be32 keyid; /* IMA key identifier - not X509/PGP specific */
bb543e39 TJB	112	__be16 sig_size; /* signature size */
d3634d0f DK	113	uint8_t sig[0]; /* signature payload */
	114	} __packed;
	115
f381c272 MZ	116	/* integrity data associated with an inode */
f381c272 MZ	117	struct integrity_iint_cache {
c7c8bb23	118	struct rb_node rb_node; /* rooted in integrity_iint_tree */
0d73a552	119	struct mutex mutex; /* protects: version, flags, digest */
f381c272 MZ	120	struct inode inode; / back pointer to inode in question */
f381c272 MZ	121	u64 version; /* track inode changes */
f578c08e	122	unsigned long flags;
96d450bb	123	unsigned long measured_pcrs;
0d73a552	124	unsigned long atomic_flags;
d79d72e0 MZ	125	enum integrity_status ima_file_status:4;
	126	enum integrity_status ima_mmap_status:4;
	127	enum integrity_status ima_bprm_status:4;
cf222217	128	enum integrity_status ima_read_status:4;
d906c10d	129	enum integrity_status ima_creds_status:4;
ee866331	130	enum integrity_status evm_status:4;
a35c3fb6	131	struct ima_digest_data *ima_hash;
f381c272 MZ	132	};
	133
	134	/* rbtree tree calls to lookup, insert, delete
	135	* integrity data associated with an inode.
	136	*/
f381c272	137	struct integrity_iint_cache integrity_iint_find(struct inode inode);
4892722e	138
e3c4abbf	139	int integrity_kernel_read(struct file *file, loff_t offset,
bb543e39 TJB	140	void *addr, unsigned long count);
bb543e39 TJB	141
8607c501	142	#define INTEGRITY_KEYRING_EVM 0
f4dc3778	143	#define INTEGRITY_KEYRING_IMA 1
c7f7e58f TJB	144	#define INTEGRITY_KEYRING_PLATFORM 2
c7f7e58f TJB	145	#define INTEGRITY_KEYRING_MAX 3
8607c501	146
0c343af8 MG	147	extern struct dentry *integrity_dir;
0c343af8 MG	148
f1be242c	149	#ifdef CONFIG_INTEGRITY_SIGNATURE
8607c501 DK	150
8607c501 DK	151	int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
089bc8e9	152	const char *digest, int digestlen);
8607c501	153
d16a8585	154	int __init integrity_init_keyring(const unsigned int id);
9d03a721	155	int __init integrity_load_x509(const unsigned int id, const char *path);
60740acc NJ	156	int __init integrity_load_cert(const unsigned int id, const char *source,
60740acc NJ	157	const void *data, size_t len, key_perm_t perm);
8607c501 DK	158	#else
	159
	160	static inline int integrity_digsig_verify(const unsigned int id,
	161	const char *sig, int siglen,
	162	const char *digest, int digestlen)
	163	{
	164	return -EOPNOTSUPP;
	165	}
	166
7d2ce232 MZ	167	static inline int integrity_init_keyring(const unsigned int id)
	168	{
	169	return 0;
	170	}
60740acc NJ	171
	172	static inline int __init integrity_load_cert(const unsigned int id,
	173	const char *source,
	174	const void *data, size_t len,
	175	key_perm_t perm)
	176	{
	177	return 0;
	178	}
f1be242c	179	#endif /* CONFIG_INTEGRITY_SIGNATURE */
8607c501	180
e0751257 DK	181	#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
	182	int asymmetric_verify(struct key keyring, const char sig,
	183	int siglen, const char *data, int datalen);
	184	#else
	185	static inline int asymmetric_verify(struct key keyring, const char sig,
	186	int siglen, const char *data, int datalen)
	187	{
	188	return -EOPNOTSUPP;
	189	}
	190	#endif
	191
fd5f4e90 DK	192	#ifdef CONFIG_IMA_LOAD_X509
	193	void __init ima_load_x509(void);
	194	#else
	195	static inline void ima_load_x509(void)
	196	{
	197	}
	198	#endif
	199
2ce523eb DK	200	#ifdef CONFIG_EVM_LOAD_X509
	201	void __init evm_load_x509(void);
	202	#else
	203	static inline void evm_load_x509(void)
	204	{
	205	}
	206	#endif
	207
d726d8d7 MZ	208	#ifdef CONFIG_INTEGRITY_AUDIT
	209	/* declarations */
	210	void integrity_audit_msg(int audit_msgno, struct inode *inode,
	211	const unsigned char fname, const char op,
	212	const char *cause, int result, int info);
2afd020a SB	213
	214	static inline struct audit_buffer *
	215	integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
	216	{
	217	return audit_log_start(ctx, gfp_mask, type);
	218	}
	219
d726d8d7 MZ	220	#else
	221	static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
	222	const unsigned char *fname,
	223	const char op, const char cause,
	224	int result, int info)
	225	{
	226	}
2afd020a SB	227
	228	static inline struct audit_buffer *
	229	integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
	230	{
	231	return NULL;
	232	}
	233
d726d8d7	234	#endif
60740acc NJ	235
	236	#ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING
	237	void __init add_to_platform_keyring(const char source, const void data,
	238	size_t len);
	239	#else
	240	static inline void __init add_to_platform_keyring(const char *source,
	241	const void *data, size_t len)
	242	{
	243	}
	244	#endif