/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2009-2010 IBM Corporation * * Authors: * Mimi Zohar <zohar@us.ibm.com> */ #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 imputed_trust_enabled(void); #else static inline void __init add_to_machine_keyring(const char *source, const void *data, size_t len) { } static inline bool __init imputed_trust_enabled(void) { return false; } #endif