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 #define IMA_PERMIT_DIRECTIO 0x04000000 34 35 #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ 36 IMA_APPRAISE_SUBMASK) 37 #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ 38 IMA_COLLECTED | IMA_APPRAISED_SUBMASK) 39 40 /* iint subaction appraise cache flags */ 41 #define IMA_FILE_APPRAISE 0x00000100 42 #define IMA_FILE_APPRAISED 0x00000200 43 #define IMA_MMAP_APPRAISE 0x00000400 44 #define IMA_MMAP_APPRAISED 0x00000800 45 #define IMA_BPRM_APPRAISE 0x00001000 46 #define IMA_BPRM_APPRAISED 0x00002000 47 #define IMA_MODULE_APPRAISE 0x00004000 48 #define IMA_MODULE_APPRAISED 0x00008000 49 #define IMA_FIRMWARE_APPRAISE 0x00010000 50 #define IMA_FIRMWARE_APPRAISED 0x00020000 51 #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ 52 IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE | \ 53 IMA_FIRMWARE_APPRAISE) 54 #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ 55 IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED | \ 56 IMA_FIRMWARE_APPRAISED) 57 58 enum evm_ima_xattr_type { 59 IMA_XATTR_DIGEST = 0x01, 60 EVM_XATTR_HMAC, 61 EVM_IMA_XATTR_DIGSIG, 62 IMA_XATTR_DIGEST_NG, 63 }; 64 65 struct evm_ima_xattr_data { 66 u8 type; 67 u8 digest[SHA1_DIGEST_SIZE]; 68 } __packed; 69 70 #define IMA_MAX_DIGEST_SIZE 64 71 72 struct ima_digest_data { 73 u8 algo; 74 u8 length; 75 union { 76 struct { 77 u8 unused; 78 u8 type; 79 } sha1; 80 struct { 81 u8 type; 82 u8 algo; 83 } ng; 84 u8 data[2]; 85 } xattr; 86 u8 digest[0]; 87 } __packed; 88 89 /* 90 * signature format v2 - for using with asymmetric keys 91 */ 92 struct signature_v2_hdr { 93 uint8_t type; /* xattr type */ 94 uint8_t version; /* signature format version */ 95 uint8_t hash_algo; /* Digest algorithm [enum pkey_hash_algo] */ 96 uint32_t keyid; /* IMA key identifier - not X509/PGP specific */ 97 uint16_t sig_size; /* signature size */ 98 uint8_t sig[0]; /* signature payload */ 99 } __packed; 100 101 /* integrity data associated with an inode */ 102 struct integrity_iint_cache { 103 struct rb_node rb_node; /* rooted in integrity_iint_tree */ 104 struct inode *inode; /* back pointer to inode in question */ 105 u64 version; /* track inode changes */ 106 unsigned long flags; 107 enum integrity_status ima_file_status:4; 108 enum integrity_status ima_mmap_status:4; 109 enum integrity_status ima_bprm_status:4; 110 enum integrity_status ima_module_status:4; 111 enum integrity_status ima_firmware_status:4; 112 enum integrity_status evm_status:4; 113 struct ima_digest_data *ima_hash; 114 }; 115 116 /* rbtree tree calls to lookup, insert, delete 117 * integrity data associated with an inode. 118 */ 119 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); 120 struct integrity_iint_cache *integrity_iint_find(struct inode *inode); 121 122 #define INTEGRITY_KEYRING_EVM 0 123 #define INTEGRITY_KEYRING_MODULE 1 124 #define INTEGRITY_KEYRING_IMA 2 125 #define INTEGRITY_KEYRING_MAX 3 126 127 #ifdef CONFIG_INTEGRITY_SIGNATURE 128 129 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, 130 const char *digest, int digestlen); 131 132 int integrity_init_keyring(const unsigned int id); 133 #else 134 135 static inline int integrity_digsig_verify(const unsigned int id, 136 const char *sig, int siglen, 137 const char *digest, int digestlen) 138 { 139 return -EOPNOTSUPP; 140 } 141 142 static inline int integrity_init_keyring(const unsigned int id) 143 { 144 return 0; 145 } 146 #endif /* CONFIG_INTEGRITY_SIGNATURE */ 147 148 #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS 149 int asymmetric_verify(struct key *keyring, const char *sig, 150 int siglen, const char *data, int datalen); 151 #else 152 static inline int asymmetric_verify(struct key *keyring, const char *sig, 153 int siglen, const char *data, int datalen) 154 { 155 return -EOPNOTSUPP; 156 } 157 #endif 158 159 #ifdef CONFIG_INTEGRITY_AUDIT 160 /* declarations */ 161 void integrity_audit_msg(int audit_msgno, struct inode *inode, 162 const unsigned char *fname, const char *op, 163 const char *cause, int result, int info); 164 #else 165 static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, 166 const unsigned char *fname, 167 const char *op, const char *cause, 168 int result, int info) 169 { 170 } 171 #endif 172 173 /* set during initialization */ 174 extern int iint_initialized; 175