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_ACTION_RULE_FLAGS 0x06000000 32 #define IMA_DIGSIG 0x01000000 33 #define IMA_DIGSIG_REQUIRED 0x02000000 34 #define IMA_PERMIT_DIRECTIO 0x04000000 35 #define IMA_NEW_FILE 0x08000000 36 37 #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ 38 IMA_APPRAISE_SUBMASK) 39 #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ 40 IMA_COLLECTED | IMA_APPRAISED_SUBMASK) 41 42 /* iint subaction appraise cache flags */ 43 #define IMA_FILE_APPRAISE 0x00000100 44 #define IMA_FILE_APPRAISED 0x00000200 45 #define IMA_MMAP_APPRAISE 0x00000400 46 #define IMA_MMAP_APPRAISED 0x00000800 47 #define IMA_BPRM_APPRAISE 0x00001000 48 #define IMA_BPRM_APPRAISED 0x00002000 49 #define IMA_READ_APPRAISE 0x00004000 50 #define IMA_READ_APPRAISED 0x00008000 51 #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ 52 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE) 53 #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ 54 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED) 55 56 enum evm_ima_xattr_type { 57 IMA_XATTR_DIGEST = 0x01, 58 EVM_XATTR_HMAC, 59 EVM_IMA_XATTR_DIGSIG, 60 IMA_XATTR_DIGEST_NG, 61 IMA_XATTR_LAST 62 }; 63 64 struct evm_ima_xattr_data { 65 u8 type; 66 u8 digest[SHA1_DIGEST_SIZE]; 67 } __packed; 68 69 #define IMA_MAX_DIGEST_SIZE 64 70 71 struct ima_digest_data { 72 u8 algo; 73 u8 length; 74 union { 75 struct { 76 u8 unused; 77 u8 type; 78 } sha1; 79 struct { 80 u8 type; 81 u8 algo; 82 } ng; 83 u8 data[2]; 84 } xattr; 85 u8 digest[0]; 86 } __packed; 87 88 /* 89 * signature format v2 - for using with asymmetric keys 90 */ 91 struct signature_v2_hdr { 92 uint8_t type; /* xattr type */ 93 uint8_t version; /* signature format version */ 94 uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */ 95 __be32 keyid; /* IMA key identifier - not X509/PGP specific */ 96 __be16 sig_size; /* signature size */ 97 uint8_t sig[0]; /* signature payload */ 98 } __packed; 99 100 /* integrity data associated with an inode */ 101 struct integrity_iint_cache { 102 struct rb_node rb_node; /* rooted in integrity_iint_tree */ 103 struct inode *inode; /* back pointer to inode in question */ 104 u64 version; /* track inode changes */ 105 unsigned long flags; 106 unsigned long measured_pcrs; 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_read_status:4; 111 enum integrity_status evm_status:4; 112 struct ima_digest_data *ima_hash; 113 }; 114 115 /* rbtree tree calls to lookup, insert, delete 116 * integrity data associated with an inode. 117 */ 118 struct integrity_iint_cache *integrity_iint_find(struct inode *inode); 119 120 int integrity_kernel_read(struct file *file, loff_t offset, 121 void *addr, unsigned long count); 122 123 int __init integrity_read_file(const char *path, char **data); 124 125 #define INTEGRITY_KEYRING_EVM 0 126 #define INTEGRITY_KEYRING_IMA 1 127 #define INTEGRITY_KEYRING_MODULE 2 128 #define INTEGRITY_KEYRING_MAX 3 129 130 #ifdef CONFIG_INTEGRITY_SIGNATURE 131 132 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, 133 const char *digest, int digestlen); 134 135 int __init integrity_init_keyring(const unsigned int id); 136 int __init integrity_load_x509(const unsigned int id, const char *path); 137 #else 138 139 static inline int integrity_digsig_verify(const unsigned int id, 140 const char *sig, int siglen, 141 const char *digest, int digestlen) 142 { 143 return -EOPNOTSUPP; 144 } 145 146 static inline int integrity_init_keyring(const unsigned int id) 147 { 148 return 0; 149 } 150 #endif /* CONFIG_INTEGRITY_SIGNATURE */ 151 152 #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS 153 int asymmetric_verify(struct key *keyring, const char *sig, 154 int siglen, const char *data, int datalen); 155 #else 156 static inline int asymmetric_verify(struct key *keyring, const char *sig, 157 int siglen, const char *data, int datalen) 158 { 159 return -EOPNOTSUPP; 160 } 161 #endif 162 163 #ifdef CONFIG_IMA_LOAD_X509 164 void __init ima_load_x509(void); 165 #else 166 static inline void ima_load_x509(void) 167 { 168 } 169 #endif 170 171 #ifdef CONFIG_EVM_LOAD_X509 172 void __init evm_load_x509(void); 173 #else 174 static inline void evm_load_x509(void) 175 { 176 } 177 #endif 178 179 #ifdef CONFIG_INTEGRITY_AUDIT 180 /* declarations */ 181 void integrity_audit_msg(int audit_msgno, struct inode *inode, 182 const unsigned char *fname, const char *op, 183 const char *cause, int result, int info); 184 #else 185 static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, 186 const unsigned char *fname, 187 const char *op, const char *cause, 188 int result, int info) 189 { 190 } 191 #endif 192