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 #define IMA_MODSIG_ALLOWED 0x20000000 35 #define IMA_CHECK_BLACKLIST 0x40000000 36 37 #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ 38 IMA_HASH | IMA_APPRAISE_SUBMASK) 39 #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ 40 IMA_HASHED | IMA_COLLECTED | \ 41 IMA_APPRAISED_SUBMASK) 42 43 /* iint subaction appraise cache flags */ 44 #define IMA_FILE_APPRAISE 0x00001000 45 #define IMA_FILE_APPRAISED 0x00002000 46 #define IMA_MMAP_APPRAISE 0x00004000 47 #define IMA_MMAP_APPRAISED 0x00008000 48 #define IMA_BPRM_APPRAISE 0x00010000 49 #define IMA_BPRM_APPRAISED 0x00020000 50 #define IMA_READ_APPRAISE 0x00040000 51 #define IMA_READ_APPRAISED 0x00080000 52 #define IMA_CREDS_APPRAISE 0x00100000 53 #define IMA_CREDS_APPRAISED 0x00200000 54 #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ 55 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \ 56 IMA_CREDS_APPRAISE) 57 #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ 58 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \ 59 IMA_CREDS_APPRAISED) 60 61 /* iint cache atomic_flags */ 62 #define IMA_CHANGE_XATTR 0 63 #define IMA_UPDATE_XATTR 1 64 #define IMA_CHANGE_ATTR 2 65 #define IMA_DIGSIG 3 66 #define IMA_MUST_MEASURE 4 67 68 enum evm_ima_xattr_type { 69 IMA_XATTR_DIGEST = 0x01, 70 EVM_XATTR_HMAC, 71 EVM_IMA_XATTR_DIGSIG, 72 IMA_XATTR_DIGEST_NG, 73 EVM_XATTR_PORTABLE_DIGSIG, 74 IMA_XATTR_LAST 75 }; 76 77 struct evm_ima_xattr_data { 78 u8 type; 79 u8 data[]; 80 } __packed; 81 82 /* Only used in the EVM HMAC code. */ 83 struct evm_xattr { 84 struct evm_ima_xattr_data data; 85 u8 digest[SHA1_DIGEST_SIZE]; 86 } __packed; 87 88 #define IMA_MAX_DIGEST_SIZE 64 89 90 struct ima_digest_data { 91 u8 algo; 92 u8 length; 93 union { 94 struct { 95 u8 unused; 96 u8 type; 97 } sha1; 98 struct { 99 u8 type; 100 u8 algo; 101 } ng; 102 u8 data[2]; 103 } xattr; 104 u8 digest[0]; 105 } __packed; 106 107 /* 108 * signature format v2 - for using with asymmetric keys 109 */ 110 struct signature_v2_hdr { 111 uint8_t type; /* xattr type */ 112 uint8_t version; /* signature format version */ 113 uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */ 114 __be32 keyid; /* IMA key identifier - not X509/PGP specific */ 115 __be16 sig_size; /* signature size */ 116 uint8_t sig[0]; /* signature payload */ 117 } __packed; 118 119 /* integrity data associated with an inode */ 120 struct integrity_iint_cache { 121 struct rb_node rb_node; /* rooted in integrity_iint_tree */ 122 struct mutex mutex; /* protects: version, flags, digest */ 123 struct inode *inode; /* back pointer to inode in question */ 124 u64 version; /* track inode changes */ 125 unsigned long flags; 126 unsigned long measured_pcrs; 127 unsigned long atomic_flags; 128 enum integrity_status ima_file_status:4; 129 enum integrity_status ima_mmap_status:4; 130 enum integrity_status ima_bprm_status:4; 131 enum integrity_status ima_read_status:4; 132 enum integrity_status ima_creds_status:4; 133 enum integrity_status evm_status:4; 134 struct ima_digest_data *ima_hash; 135 }; 136 137 /* rbtree tree calls to lookup, insert, delete 138 * integrity data associated with an inode. 139 */ 140 struct integrity_iint_cache *integrity_iint_find(struct inode *inode); 141 142 int integrity_kernel_read(struct file *file, loff_t offset, 143 void *addr, unsigned long count); 144 145 #define INTEGRITY_KEYRING_EVM 0 146 #define INTEGRITY_KEYRING_IMA 1 147 #define INTEGRITY_KEYRING_PLATFORM 2 148 #define INTEGRITY_KEYRING_MAX 3 149 150 extern struct dentry *integrity_dir; 151 152 struct modsig; 153 154 #ifdef CONFIG_INTEGRITY_SIGNATURE 155 156 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, 157 const char *digest, int digestlen); 158 int integrity_modsig_verify(unsigned int id, const struct modsig *modsig); 159 160 int __init integrity_init_keyring(const unsigned int id); 161 int __init integrity_load_x509(const unsigned int id, const char *path); 162 int __init integrity_load_cert(const unsigned int id, const char *source, 163 const void *data, size_t len, key_perm_t perm); 164 #else 165 166 static inline int integrity_digsig_verify(const unsigned int id, 167 const char *sig, int siglen, 168 const char *digest, int digestlen) 169 { 170 return -EOPNOTSUPP; 171 } 172 173 static inline int integrity_modsig_verify(unsigned int id, 174 const struct modsig *modsig) 175 { 176 return -EOPNOTSUPP; 177 } 178 179 static inline int integrity_init_keyring(const unsigned int id) 180 { 181 return 0; 182 } 183 184 static inline int __init integrity_load_cert(const unsigned int id, 185 const char *source, 186 const void *data, size_t len, 187 key_perm_t perm) 188 { 189 return 0; 190 } 191 #endif /* CONFIG_INTEGRITY_SIGNATURE */ 192 193 #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS 194 int asymmetric_verify(struct key *keyring, const char *sig, 195 int siglen, const char *data, int datalen); 196 #else 197 static inline int asymmetric_verify(struct key *keyring, const char *sig, 198 int siglen, const char *data, int datalen) 199 { 200 return -EOPNOTSUPP; 201 } 202 #endif 203 204 #ifdef CONFIG_IMA_APPRAISE_MODSIG 205 int ima_modsig_verify(struct key *keyring, const struct modsig *modsig); 206 #else 207 static inline int ima_modsig_verify(struct key *keyring, 208 const struct modsig *modsig) 209 { 210 return -EOPNOTSUPP; 211 } 212 #endif 213 214 #ifdef CONFIG_IMA_LOAD_X509 215 void __init ima_load_x509(void); 216 #else 217 static inline void ima_load_x509(void) 218 { 219 } 220 #endif 221 222 #ifdef CONFIG_EVM_LOAD_X509 223 void __init evm_load_x509(void); 224 #else 225 static inline void evm_load_x509(void) 226 { 227 } 228 #endif 229 230 #ifdef CONFIG_INTEGRITY_AUDIT 231 /* declarations */ 232 void integrity_audit_msg(int audit_msgno, struct inode *inode, 233 const unsigned char *fname, const char *op, 234 const char *cause, int result, int info); 235 236 static inline struct audit_buffer * 237 integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) 238 { 239 return audit_log_start(ctx, gfp_mask, type); 240 } 241 242 #else 243 static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, 244 const unsigned char *fname, 245 const char *op, const char *cause, 246 int result, int info) 247 { 248 } 249 250 static inline struct audit_buffer * 251 integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) 252 { 253 return NULL; 254 } 255 256 #endif 257 258 #ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING 259 void __init add_to_platform_keyring(const char *source, const void *data, 260 size_t len); 261 #else 262 static inline void __init add_to_platform_keyring(const char *source, 263 const void *data, size_t len) 264 { 265 } 266 #endif 267