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 IMA_XATTR_DIGEST_NG, 58 }; 59 60 struct evm_ima_xattr_data { 61 u8 type; 62 u8 digest[SHA1_DIGEST_SIZE]; 63 } __packed; 64 65 #define IMA_MAX_DIGEST_SIZE 64 66 67 struct ima_digest_data { 68 u8 algo; 69 u8 length; 70 union { 71 struct { 72 u8 unused; 73 u8 type; 74 } sha1; 75 struct { 76 u8 type; 77 u8 algo; 78 } ng; 79 u8 data[2]; 80 } xattr; 81 u8 digest[0]; 82 } __packed; 83 84 /* 85 * signature format v2 - for using with asymmetric keys 86 */ 87 struct signature_v2_hdr { 88 uint8_t type; /* xattr type */ 89 uint8_t version; /* signature format version */ 90 uint8_t hash_algo; /* Digest algorithm [enum pkey_hash_algo] */ 91 uint32_t keyid; /* IMA key identifier - not X509/PGP specific */ 92 uint16_t sig_size; /* signature size */ 93 uint8_t sig[0]; /* signature payload */ 94 } __packed; 95 96 /* integrity data associated with an inode */ 97 struct integrity_iint_cache { 98 struct rb_node rb_node; /* rooted in integrity_iint_tree */ 99 struct inode *inode; /* back pointer to inode in question */ 100 u64 version; /* track inode changes */ 101 unsigned long flags; 102 enum integrity_status ima_file_status:4; 103 enum integrity_status ima_mmap_status:4; 104 enum integrity_status ima_bprm_status:4; 105 enum integrity_status ima_module_status:4; 106 enum integrity_status evm_status:4; 107 struct ima_digest_data *ima_hash; 108 }; 109 110 /* rbtree tree calls to lookup, insert, delete 111 * integrity data associated with an inode. 112 */ 113 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); 114 struct integrity_iint_cache *integrity_iint_find(struct inode *inode); 115 116 #define INTEGRITY_KEYRING_EVM 0 117 #define INTEGRITY_KEYRING_MODULE 1 118 #define INTEGRITY_KEYRING_IMA 2 119 #define INTEGRITY_KEYRING_MAX 3 120 121 #ifdef CONFIG_INTEGRITY_SIGNATURE 122 123 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, 124 const char *digest, int digestlen); 125 126 #else 127 128 static inline int integrity_digsig_verify(const unsigned int id, 129 const char *sig, int siglen, 130 const char *digest, int digestlen) 131 { 132 return -EOPNOTSUPP; 133 } 134 135 #endif /* CONFIG_INTEGRITY_SIGNATURE */ 136 137 #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS 138 int asymmetric_verify(struct key *keyring, const char *sig, 139 int siglen, const char *data, int datalen); 140 #else 141 static inline int asymmetric_verify(struct key *keyring, const char *sig, 142 int siglen, const char *data, int datalen) 143 { 144 return -EOPNOTSUPP; 145 } 146 #endif 147 148 #ifdef CONFIG_INTEGRITY_AUDIT 149 /* declarations */ 150 void integrity_audit_msg(int audit_msgno, struct inode *inode, 151 const unsigned char *fname, const char *op, 152 const char *cause, int result, int info); 153 #else 154 static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, 155 const unsigned char *fname, 156 const char *op, const char *cause, 157 int result, int info) 158 { 159 } 160 #endif 161 162 /* set during initialization */ 163 extern int iint_initialized; 164