1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2009-2010 IBM Corporation 4 * 5 * Authors: 6 * Mimi Zohar <zohar@us.ibm.com> 7 */ 8 9 #include <linux/types.h> 10 #include <linux/integrity.h> 11 #include <crypto/sha.h> 12 #include <linux/key.h> 13 #include <linux/audit.h> 14 15 /* iint action cache flags */ 16 #define IMA_MEASURE 0x00000001 17 #define IMA_MEASURED 0x00000002 18 #define IMA_APPRAISE 0x00000004 19 #define IMA_APPRAISED 0x00000008 20 /*#define IMA_COLLECT 0x00000010 do not use this flag */ 21 #define IMA_COLLECTED 0x00000020 22 #define IMA_AUDIT 0x00000040 23 #define IMA_AUDITED 0x00000080 24 #define IMA_HASH 0x00000100 25 #define IMA_HASHED 0x00000200 26 27 /* iint cache flags */ 28 #define IMA_ACTION_FLAGS 0xff000000 29 #define IMA_DIGSIG_REQUIRED 0x01000000 30 #define IMA_PERMIT_DIRECTIO 0x02000000 31 #define IMA_NEW_FILE 0x04000000 32 #define EVM_IMMUTABLE_DIGSIG 0x08000000 33 #define IMA_FAIL_UNVERIFIABLE_SIGS 0x10000000 34 35 #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ 36 IMA_HASH | IMA_APPRAISE_SUBMASK) 37 #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ 38 IMA_HASHED | IMA_COLLECTED | \ 39 IMA_APPRAISED_SUBMASK) 40 41 /* iint subaction appraise cache flags */ 42 #define IMA_FILE_APPRAISE 0x00001000 43 #define IMA_FILE_APPRAISED 0x00002000 44 #define IMA_MMAP_APPRAISE 0x00004000 45 #define IMA_MMAP_APPRAISED 0x00008000 46 #define IMA_BPRM_APPRAISE 0x00010000 47 #define IMA_BPRM_APPRAISED 0x00020000 48 #define IMA_READ_APPRAISE 0x00040000 49 #define IMA_READ_APPRAISED 0x00080000 50 #define IMA_CREDS_APPRAISE 0x00100000 51 #define IMA_CREDS_APPRAISED 0x00200000 52 #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ 53 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \ 54 IMA_CREDS_APPRAISE) 55 #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ 56 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \ 57 IMA_CREDS_APPRAISED) 58 59 /* iint cache atomic_flags */ 60 #define IMA_CHANGE_XATTR 0 61 #define IMA_UPDATE_XATTR 1 62 #define IMA_CHANGE_ATTR 2 63 #define IMA_DIGSIG 3 64 #define IMA_MUST_MEASURE 4 65 66 enum evm_ima_xattr_type { 67 IMA_XATTR_DIGEST = 0x01, 68 EVM_XATTR_HMAC, 69 EVM_IMA_XATTR_DIGSIG, 70 IMA_XATTR_DIGEST_NG, 71 EVM_XATTR_PORTABLE_DIGSIG, 72 IMA_XATTR_LAST 73 }; 74 75 struct evm_ima_xattr_data { 76 u8 type; 77 u8 digest[SHA1_DIGEST_SIZE]; 78 } __packed; 79 80 #define IMA_MAX_DIGEST_SIZE 64 81 82 struct ima_digest_data { 83 u8 algo; 84 u8 length; 85 union { 86 struct { 87 u8 unused; 88 u8 type; 89 } sha1; 90 struct { 91 u8 type; 92 u8 algo; 93 } ng; 94 u8 data[2]; 95 } xattr; 96 u8 digest[0]; 97 } __packed; 98 99 /* 100 * signature format v2 - for using with asymmetric keys 101 */ 102 struct signature_v2_hdr { 103 uint8_t type; /* xattr type */ 104 uint8_t version; /* signature format version */ 105 uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */ 106 __be32 keyid; /* IMA key identifier - not X509/PGP specific */ 107 __be16 sig_size; /* signature size */ 108 uint8_t sig[0]; /* signature payload */ 109 } __packed; 110 111 /* integrity data associated with an inode */ 112 struct integrity_iint_cache { 113 struct rb_node rb_node; /* rooted in integrity_iint_tree */ 114 struct mutex mutex; /* protects: version, flags, digest */ 115 struct inode *inode; /* back pointer to inode in question */ 116 u64 version; /* track inode changes */ 117 unsigned long flags; 118 unsigned long measured_pcrs; 119 unsigned long atomic_flags; 120 enum integrity_status ima_file_status:4; 121 enum integrity_status ima_mmap_status:4; 122 enum integrity_status ima_bprm_status:4; 123 enum integrity_status ima_read_status:4; 124 enum integrity_status ima_creds_status:4; 125 enum integrity_status evm_status:4; 126 struct ima_digest_data *ima_hash; 127 }; 128 129 /* rbtree tree calls to lookup, insert, delete 130 * integrity data associated with an inode. 131 */ 132 struct integrity_iint_cache *integrity_iint_find(struct inode *inode); 133 134 int integrity_kernel_read(struct file *file, loff_t offset, 135 void *addr, unsigned long count); 136 137 #define INTEGRITY_KEYRING_EVM 0 138 #define INTEGRITY_KEYRING_IMA 1 139 #define INTEGRITY_KEYRING_PLATFORM 2 140 #define INTEGRITY_KEYRING_MAX 3 141 142 extern struct dentry *integrity_dir; 143 144 #ifdef CONFIG_INTEGRITY_SIGNATURE 145 146 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, 147 const char *digest, int digestlen); 148 149 int __init integrity_init_keyring(const unsigned int id); 150 int __init integrity_load_x509(const unsigned int id, const char *path); 151 int __init integrity_load_cert(const unsigned int id, const char *source, 152 const void *data, size_t len, key_perm_t perm); 153 #else 154 155 static inline int integrity_digsig_verify(const unsigned int id, 156 const char *sig, int siglen, 157 const char *digest, int digestlen) 158 { 159 return -EOPNOTSUPP; 160 } 161 162 static inline int integrity_init_keyring(const unsigned int id) 163 { 164 return 0; 165 } 166 167 static inline int __init integrity_load_cert(const unsigned int id, 168 const char *source, 169 const void *data, size_t len, 170 key_perm_t perm) 171 { 172 return 0; 173 } 174 #endif /* CONFIG_INTEGRITY_SIGNATURE */ 175 176 #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS 177 int asymmetric_verify(struct key *keyring, const char *sig, 178 int siglen, const char *data, int datalen); 179 #else 180 static inline int asymmetric_verify(struct key *keyring, const char *sig, 181 int siglen, const char *data, int datalen) 182 { 183 return -EOPNOTSUPP; 184 } 185 #endif 186 187 #ifdef CONFIG_IMA_LOAD_X509 188 void __init ima_load_x509(void); 189 #else 190 static inline void ima_load_x509(void) 191 { 192 } 193 #endif 194 195 #ifdef CONFIG_EVM_LOAD_X509 196 void __init evm_load_x509(void); 197 #else 198 static inline void evm_load_x509(void) 199 { 200 } 201 #endif 202 203 #ifdef CONFIG_INTEGRITY_AUDIT 204 /* declarations */ 205 void integrity_audit_msg(int audit_msgno, struct inode *inode, 206 const unsigned char *fname, const char *op, 207 const char *cause, int result, int info); 208 209 static inline struct audit_buffer * 210 integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) 211 { 212 return audit_log_start(ctx, gfp_mask, type); 213 } 214 215 #else 216 static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, 217 const unsigned char *fname, 218 const char *op, const char *cause, 219 int result, int info) 220 { 221 } 222 223 static inline struct audit_buffer * 224 integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) 225 { 226 return NULL; 227 } 228 229 #endif 230 231 #ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING 232 void __init add_to_platform_keyring(const char *source, const void *data, 233 size_t len); 234 #else 235 static inline void __init add_to_platform_keyring(const char *source, 236 const void *data, size_t len) 237 { 238 } 239 #endif 240