forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
333 lines
8.9 KiB
333 lines
8.9 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
|
/* |
|
* Copyright (C) 2009-2010 IBM Corporation |
|
* |
|
* Authors: |
|
* Mimi Zohar <[email protected]> |
|
*/ |
|
|
|
#ifdef pr_fmt |
|
#undef pr_fmt |
|
#endif |
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
|
|
|
#include <linux/types.h> |
|
#include <linux/integrity.h> |
|
#include <crypto/sha1.h> |
|
#include <crypto/hash.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 policy rule cache flags */ |
|
#define IMA_NONACTION_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_MODSIG_ALLOWED 0x20000000 |
|
#define IMA_CHECK_BLACKLIST 0x40000000 |
|
#define IMA_VERITY_REQUIRED 0x80000000 |
|
|
|
#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_VERITY_DIGSIG, |
|
IMA_XATTR_LAST |
|
}; |
|
|
|
struct evm_ima_xattr_data { |
|
u8 type; |
|
u8 data[]; |
|
} __packed; |
|
|
|
/* Only used in the EVM HMAC code. */ |
|
struct evm_xattr { |
|
struct evm_ima_xattr_data data; |
|
u8 digest[SHA1_DIGEST_SIZE]; |
|
} __packed; |
|
|
|
#define IMA_MAX_DIGEST_SIZE HASH_MAX_DIGESTSIZE |
|
|
|
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[]; |
|
} __packed; |
|
|
|
/* |
|
* Instead of wrapping the ima_digest_data struct inside a local structure |
|
* with the maximum hash size, define ima_max_digest_data struct. |
|
*/ |
|
struct ima_max_digest_data { |
|
struct ima_digest_data hdr; |
|
u8 digest[HASH_MAX_DIGESTSIZE]; |
|
} __packed; |
|
|
|
/* |
|
* signature header format v2 - for using with asymmetric keys |
|
* |
|
* The signature_v2_hdr struct includes a signature format version |
|
* to simplify defining new signature formats. |
|
* |
|
* signature format: |
|
* version 2: regular file data hash based signature |
|
* version 3: struct ima_file_id data based signature |
|
*/ |
|
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[]; /* signature payload */ |
|
} __packed; |
|
|
|
/* |
|
* IMA signature version 3 disambiguates the data that is signed, by |
|
* indirectly signing the hash of the ima_file_id structure data, |
|
* containing either the fsverity_descriptor struct digest or, in the |
|
* future, the regular IMA file hash. |
|
* |
|
* (The hash of the ima_file_id structure is only of the portion used.) |
|
*/ |
|
struct ima_file_id { |
|
__u8 hash_type; /* xattr type [enum evm_ima_xattr_type] */ |
|
__u8 hash_algorithm; /* Digest algorithm [enum hash_algo] */ |
|
__u8 hash[HASH_MAX_DIGESTSIZE]; |
|
} __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_MACHINE 3 |
|
#define INTEGRITY_KEYRING_MAX 4 |
|
|
|
extern struct dentry *integrity_dir; |
|
|
|
struct modsig; |
|
|
|
#ifdef CONFIG_INTEGRITY_SIGNATURE |
|
|
|
int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, |
|
const char *digest, int digestlen); |
|
int integrity_modsig_verify(unsigned int id, const struct modsig *modsig); |
|
|
|
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_modsig_verify(unsigned int id, |
|
const struct modsig *modsig) |
|
{ |
|
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_APPRAISE_MODSIG |
|
int ima_modsig_verify(struct key *keyring, const struct modsig *modsig); |
|
#else |
|
static inline int ima_modsig_verify(struct key *keyring, |
|
const struct modsig *modsig) |
|
{ |
|
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); |
|
|
|
void integrity_audit_message(int audit_msgno, struct inode *inode, |
|
const unsigned char *fname, const char *op, |
|
const char *cause, int result, int info, |
|
int errno); |
|
|
|
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 void integrity_audit_message(int audit_msgno, |
|
struct inode *inode, |
|
const unsigned char *fname, |
|
const char *op, const char *cause, |
|
int result, int info, int errno) |
|
{ |
|
} |
|
|
|
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 |
|
|
|
#ifdef CONFIG_INTEGRITY_MACHINE_KEYRING |
|
void __init add_to_machine_keyring(const char *source, const void *data, size_t len); |
|
bool __init trust_moklist(void); |
|
#else |
|
static inline void __init add_to_machine_keyring(const char *source, |
|
const void *data, size_t len) |
|
{ |
|
} |
|
static inline bool __init trust_moklist(void) |
|
{ |
|
return false; |
|
} |
|
#endif
|
|
|