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> 17 #include <linux/key.h> 18 19 /* iint action cache flags */ 20 #define IMA_MEASURE 0x00000001 21 #define IMA_MEASURED 0x00000002 22 #define IMA_APPRAISE 0x00000004 23 #define IMA_APPRAISED 0x00000008 24 /*#define IMA_COLLECT 0x00000010 do not use this flag */ 25 #define IMA_COLLECTED 0x00000020 26 #define IMA_AUDIT 0x00000040 27 #define IMA_AUDITED 0x00000080 28 29 /* iint cache flags */ 30 #define IMA_ACTION_FLAGS 0xff000000 31 #define IMA_DIGSIG 0x01000000 32 #define IMA_DIGSIG_REQUIRED 0x02000000 33 34 #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ 35 IMA_APPRAISE_SUBMASK) 36 #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ 37 IMA_COLLECTED | IMA_APPRAISED_SUBMASK) 38 39 /* iint subaction appraise cache flags */ 40 #define IMA_FILE_APPRAISE 0x00000100 41 #define IMA_FILE_APPRAISED 0x00000200 42 #define IMA_MMAP_APPRAISE 0x00000400 43 #define IMA_MMAP_APPRAISED 0x00000800 44 #define IMA_BPRM_APPRAISE 0x00001000 45 #define IMA_BPRM_APPRAISED 0x00002000 46 #define IMA_MODULE_APPRAISE 0x00004000 47 #define IMA_MODULE_APPRAISED 0x00008000 48 #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ 49 IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE) 50 #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ 51 IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED) 52 53 enum evm_ima_xattr_type { 54 IMA_XATTR_DIGEST = 0x01, 55 EVM_XATTR_HMAC, 56 EVM_IMA_XATTR_DIGSIG, 57 }; 58 59 struct evm_ima_xattr_data { 60 u8 type; 61 u8 digest[SHA1_DIGEST_SIZE]; 62 } __packed; 63 64 #define IMA_MAX_DIGEST_SIZE 64 65 66 struct ima_digest_data { 67 u8 algo; 68 u8 length; 69 u8 type; 70 u8 digest[IMA_MAX_DIGEST_SIZE]; 71 } __packed; 72 73 /* integrity data associated with an inode */ 74 struct integrity_iint_cache { 75 struct rb_node rb_node; /* rooted in integrity_iint_tree */ 76 struct inode *inode; /* back pointer to inode in question */ 77 u64 version; /* track inode changes */ 78 unsigned long flags; 79 enum integrity_status ima_file_status:4; 80 enum integrity_status ima_mmap_status:4; 81 enum integrity_status ima_bprm_status:4; 82 enum integrity_status ima_module_status:4; 83 enum integrity_status evm_status:4; 84 struct ima_digest_data ima_hash; 85 }; 86 87 /* rbtree tree calls to lookup, insert, delete 88 * integrity data associated with an inode. 89 */ 90 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); 91 struct integrity_iint_cache *integrity_iint_find(struct inode *inode); 92 93 #define INTEGRITY_KEYRING_EVM 0 94 #define INTEGRITY_KEYRING_MODULE 1 95 #define INTEGRITY_KEYRING_IMA 2 96 #define INTEGRITY_KEYRING_MAX 3 97 98 #ifdef CONFIG_INTEGRITY_SIGNATURE 99 100 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, 101 const char *digest, int digestlen); 102 103 #else 104 105 static inline int integrity_digsig_verify(const unsigned int id, 106 const char *sig, int siglen, 107 const char *digest, int digestlen) 108 { 109 return -EOPNOTSUPP; 110 } 111 112 #endif /* CONFIG_INTEGRITY_SIGNATURE */ 113 114 #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS 115 int asymmetric_verify(struct key *keyring, const char *sig, 116 int siglen, const char *data, int datalen); 117 #else 118 static inline int asymmetric_verify(struct key *keyring, const char *sig, 119 int siglen, const char *data, int datalen) 120 { 121 return -EOPNOTSUPP; 122 } 123 #endif 124 125 #ifdef CONFIG_INTEGRITY_AUDIT 126 /* declarations */ 127 void integrity_audit_msg(int audit_msgno, struct inode *inode, 128 const unsigned char *fname, const char *op, 129 const char *cause, int result, int info); 130 #else 131 static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, 132 const unsigned char *fname, 133 const char *op, const char *cause, 134 int result, int info) 135 { 136 } 137 #endif 138 139 /* set during initialization */ 140 extern int iint_initialized; 141