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_READ_APPRAISE 0x00004000 49 #define IMA_READ_APPRAISED 0x00008000 50 #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ 51 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE) 52 #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ 53 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED) 54 55 enum evm_ima_xattr_type { 56 IMA_XATTR_DIGEST = 0x01, 57 EVM_XATTR_HMAC, 58 EVM_IMA_XATTR_DIGSIG, 59 IMA_XATTR_DIGEST_NG, 60 IMA_XATTR_LAST 61 }; 62 63 struct evm_ima_xattr_data { 64 u8 type; 65 u8 digest[SHA1_DIGEST_SIZE]; 66 } __packed; 67 68 #define IMA_MAX_DIGEST_SIZE 64 69 70 struct ima_digest_data { 71 u8 algo; 72 u8 length; 73 union { 74 struct { 75 u8 unused; 76 u8 type; 77 } sha1; 78 struct { 79 u8 type; 80 u8 algo; 81 } ng; 82 u8 data[2]; 83 } xattr; 84 u8 digest[0]; 85 } __packed; 86 87 /* 88 * signature format v2 - for using with asymmetric keys 89 */ 90 struct signature_v2_hdr { 91 uint8_t type; /* xattr type */ 92 uint8_t version; /* signature format version */ 93 uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */ 94 uint32_t keyid; /* IMA key identifier - not X509/PGP specific */ 95 uint16_t sig_size; /* signature size */ 96 uint8_t sig[0]; /* signature payload */ 97 } __packed; 98 99 /* integrity data associated with an inode */ 100 struct integrity_iint_cache { 101 struct rb_node rb_node; /* rooted in integrity_iint_tree */ 102 struct inode *inode; /* back pointer to inode in question */ 103 u64 version; /* track inode changes */ 104 unsigned long flags; 105 enum integrity_status ima_file_status:4; 106 enum integrity_status ima_mmap_status:4; 107 enum integrity_status ima_bprm_status:4; 108 enum integrity_status ima_read_status:4; 109 enum integrity_status evm_status:4; 110 struct ima_digest_data *ima_hash; 111 }; 112 113 /* rbtree tree calls to lookup, insert, delete 114 * integrity data associated with an inode. 115 */ 116 struct integrity_iint_cache *integrity_iint_find(struct inode *inode); 117 118 int integrity_kernel_read(struct file *file, loff_t offset, 119 char *addr, unsigned long count); 120 int __init integrity_read_file(const char *path, char **data); 121 122 #define INTEGRITY_KEYRING_EVM 0 123 #define INTEGRITY_KEYRING_IMA 1 124 #define INTEGRITY_KEYRING_MODULE 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 __init integrity_init_keyring(const unsigned int id); 133 int __init integrity_load_x509(const unsigned int id, const char *path); 134 #else 135 136 static inline int integrity_digsig_verify(const unsigned int id, 137 const char *sig, int siglen, 138 const char *digest, int digestlen) 139 { 140 return -EOPNOTSUPP; 141 } 142 143 static inline int integrity_init_keyring(const unsigned int id) 144 { 145 return 0; 146 } 147 #endif /* CONFIG_INTEGRITY_SIGNATURE */ 148 149 #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS 150 int asymmetric_verify(struct key *keyring, const char *sig, 151 int siglen, const char *data, int datalen); 152 #else 153 static inline int asymmetric_verify(struct key *keyring, const char *sig, 154 int siglen, const char *data, int datalen) 155 { 156 return -EOPNOTSUPP; 157 } 158 #endif 159 160 #ifdef CONFIG_IMA_LOAD_X509 161 void __init ima_load_x509(void); 162 #else 163 static inline void ima_load_x509(void) 164 { 165 } 166 #endif 167 168 #ifdef CONFIG_EVM_LOAD_X509 169 void __init evm_load_x509(void); 170 #else 171 static inline void evm_load_x509(void) 172 { 173 } 174 #endif 175 176 #ifdef CONFIG_INTEGRITY_AUDIT 177 /* declarations */ 178 void integrity_audit_msg(int audit_msgno, struct inode *inode, 179 const unsigned char *fname, const char *op, 180 const char *cause, int result, int info); 181 #else 182 static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, 183 const unsigned char *fname, 184 const char *op, const char *cause, 185 int result, int info) 186 { 187 } 188 #endif 189