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 #define IMA_NEW_FILE 0x08000000 35 36 #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ 37 IMA_APPRAISE_SUBMASK) 38 #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ 39 IMA_COLLECTED | IMA_APPRAISED_SUBMASK) 40 41 /* iint subaction appraise cache flags */ 42 #define IMA_FILE_APPRAISE 0x00000100 43 #define IMA_FILE_APPRAISED 0x00000200 44 #define IMA_MMAP_APPRAISE 0x00000400 45 #define IMA_MMAP_APPRAISED 0x00000800 46 #define IMA_BPRM_APPRAISE 0x00001000 47 #define IMA_BPRM_APPRAISED 0x00002000 48 #define IMA_MODULE_APPRAISE 0x00004000 49 #define IMA_MODULE_APPRAISED 0x00008000 50 #define IMA_FIRMWARE_APPRAISE 0x00010000 51 #define IMA_FIRMWARE_APPRAISED 0x00020000 52 #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ 53 IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE | \ 54 IMA_FIRMWARE_APPRAISE) 55 #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ 56 IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED | \ 57 IMA_FIRMWARE_APPRAISED) 58 59 enum evm_ima_xattr_type { 60 IMA_XATTR_DIGEST = 0x01, 61 EVM_XATTR_HMAC, 62 EVM_IMA_XATTR_DIGSIG, 63 IMA_XATTR_DIGEST_NG, 64 IMA_XATTR_LAST 65 }; 66 67 struct evm_ima_xattr_data { 68 u8 type; 69 u8 digest[SHA1_DIGEST_SIZE]; 70 } __packed; 71 72 #define IMA_MAX_DIGEST_SIZE 64 73 74 struct ima_digest_data { 75 u8 algo; 76 u8 length; 77 union { 78 struct { 79 u8 unused; 80 u8 type; 81 } sha1; 82 struct { 83 u8 type; 84 u8 algo; 85 } ng; 86 u8 data[2]; 87 } xattr; 88 u8 digest[0]; 89 } __packed; 90 91 /* 92 * signature format v2 - for using with asymmetric keys 93 */ 94 struct signature_v2_hdr { 95 uint8_t type; /* xattr type */ 96 uint8_t version; /* signature format version */ 97 uint8_t hash_algo; /* Digest algorithm [enum pkey_hash_algo] */ 98 uint32_t keyid; /* IMA key identifier - not X509/PGP specific */ 99 uint16_t sig_size; /* signature size */ 100 uint8_t sig[0]; /* signature payload */ 101 } __packed; 102 103 /* integrity data associated with an inode */ 104 struct integrity_iint_cache { 105 struct rb_node rb_node; /* rooted in integrity_iint_tree */ 106 struct inode *inode; /* back pointer to inode in question */ 107 u64 version; /* track inode changes */ 108 unsigned long flags; 109 enum integrity_status ima_file_status:4; 110 enum integrity_status ima_mmap_status:4; 111 enum integrity_status ima_bprm_status:4; 112 enum integrity_status ima_module_status:4; 113 enum integrity_status ima_firmware_status:4; 114 enum integrity_status evm_status:4; 115 struct ima_digest_data *ima_hash; 116 }; 117 118 /* rbtree tree calls to lookup, insert, delete 119 * integrity data associated with an inode. 120 */ 121 struct integrity_iint_cache *integrity_iint_find(struct inode *inode); 122 123 int integrity_kernel_read(struct file *file, loff_t offset, 124 char *addr, unsigned long count); 125 int __init integrity_read_file(const char *path, char **data); 126 127 #define INTEGRITY_KEYRING_EVM 0 128 #define INTEGRITY_KEYRING_MODULE 1 129 #define INTEGRITY_KEYRING_IMA 2 130 #define INTEGRITY_KEYRING_MAX 3 131 132 #ifdef CONFIG_INTEGRITY_SIGNATURE 133 134 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, 135 const char *digest, int digestlen); 136 137 int __init integrity_init_keyring(const unsigned int id); 138 int __init integrity_load_x509(const unsigned int id, char *path); 139 #else 140 141 static inline int integrity_digsig_verify(const unsigned int id, 142 const char *sig, int siglen, 143 const char *digest, int digestlen) 144 { 145 return -EOPNOTSUPP; 146 } 147 148 static inline int integrity_init_keyring(const unsigned int id) 149 { 150 return 0; 151 } 152 153 #endif /* CONFIG_INTEGRITY_SIGNATURE */ 154 155 #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS 156 int asymmetric_verify(struct key *keyring, const char *sig, 157 int siglen, const char *data, int datalen); 158 #else 159 static inline int asymmetric_verify(struct key *keyring, const char *sig, 160 int siglen, const char *data, int datalen) 161 { 162 return -EOPNOTSUPP; 163 } 164 #endif 165 166 #ifdef CONFIG_IMA_LOAD_X509 167 void __init ima_load_x509(void); 168 #else 169 static inline void ima_load_x509(void) 170 { 171 } 172 #endif 173 174 #ifdef CONFIG_INTEGRITY_AUDIT 175 /* declarations */ 176 void integrity_audit_msg(int audit_msgno, struct inode *inode, 177 const unsigned char *fname, const char *op, 178 const char *cause, int result, int info); 179 #else 180 static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, 181 const unsigned char *fname, 182 const char *op, const char *cause, 183 int result, int info) 184 { 185 } 186 #endif 187