/* * 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_DIGSIG 0x01000000 #define IMA_DIGSIG_REQUIRED 0x02000000 #define IMA_PERMIT_DIRECTIO 0x04000000 #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_MODULE_APPRAISE 0x00004000 #define IMA_MODULE_APPRAISED 0x00008000 #define IMA_FIRMWARE_APPRAISE 0x00010000 #define IMA_FIRMWARE_APPRAISED 0x00020000 #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE | \ IMA_FIRMWARE_APPRAISE) #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED | \ IMA_FIRMWARE_APPRAISED) enum evm_ima_xattr_type { IMA_XATTR_DIGEST = 0x01, EVM_XATTR_HMAC, EVM_IMA_XATTR_DIGSIG, IMA_XATTR_DIGEST_NG, }; 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 pkey_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; 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_module_status:4; enum integrity_status ima_firmware_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_insert(struct inode *inode); struct integrity_iint_cache *integrity_iint_find(struct inode *inode); #define INTEGRITY_KEYRING_EVM 0 #define INTEGRITY_KEYRING_MODULE 1 #define INTEGRITY_KEYRING_IMA 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 integrity_init_keyring(const unsigned int id); #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_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 /* set during initialization */ extern int iint_initialized;