/* * Copyright (C) 2009-2010 IBM Corporation * * Authors: * Mimi Zohar * * 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 #include #include #include #include #include enum five_file_integrity { FIVE_FILE_UNKNOWN, FIVE_FILE_FAIL, FIVE_FILE_RSA, FIVE_FILE_DMVERITY, FIVE_FILE_FSVERITY, FIVE_FILE_HMAC }; /* 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 FIVE_DMVERITY_PROTECTED 0x00040000 #define FIVE_TRUSTED_FILE 0x00080000 #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; #ifdef CONFIG_FIVE unsigned long five_flags; enum five_file_integrity five_status; struct integrity_label *five_label; bool five_signing; #endif }; /* 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_MODULE 2 #define INTEGRITY_KEYRING_FIVE 3 #define INTEGRITY_KEYRING_MAX 4 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_x509_from_mem(const unsigned int id, const char *data, size_t size); #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); 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