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