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#ifdef pr_fmt 10#undef pr_fmt 11#endif 12 13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 14 15#include <linux/types.h> 16#include <linux/integrity.h> 17#include <crypto/sha.h> 18#include <linux/key.h> 19#include <linux/audit.h> 20 21/* iint action cache flags */ 22#define IMA_MEASURE 0x00000001 23#define IMA_MEASURED 0x00000002 24#define IMA_APPRAISE 0x00000004 25#define IMA_APPRAISED 0x00000008 26/*#define IMA_COLLECT 0x00000010 do not use this flag */ 27#define IMA_COLLECTED 0x00000020 28#define IMA_AUDIT 0x00000040 29#define IMA_AUDITED 0x00000080 30#define IMA_HASH 0x00000100 31#define IMA_HASHED 0x00000200 32 33/* iint cache flags */ 34#define IMA_ACTION_FLAGS 0xff000000 35#define IMA_DIGSIG_REQUIRED 0x01000000 36#define IMA_PERMIT_DIRECTIO 0x02000000 37#define IMA_NEW_FILE 0x04000000 38#define EVM_IMMUTABLE_DIGSIG 0x08000000 39#define IMA_FAIL_UNVERIFIABLE_SIGS 0x10000000 40#define IMA_MODSIG_ALLOWED 0x20000000 41#define IMA_CHECK_BLACKLIST 0x40000000 42 43#define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ 44 IMA_HASH | IMA_APPRAISE_SUBMASK) 45#define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ 46 IMA_HASHED | IMA_COLLECTED | \ 47 IMA_APPRAISED_SUBMASK) 48 49/* iint subaction appraise cache flags */ 50#define IMA_FILE_APPRAISE 0x00001000 51#define IMA_FILE_APPRAISED 0x00002000 52#define IMA_MMAP_APPRAISE 0x00004000 53#define IMA_MMAP_APPRAISED 0x00008000 54#define IMA_BPRM_APPRAISE 0x00010000 55#define IMA_BPRM_APPRAISED 0x00020000 56#define IMA_READ_APPRAISE 0x00040000 57#define IMA_READ_APPRAISED 0x00080000 58#define IMA_CREDS_APPRAISE 0x00100000 59#define IMA_CREDS_APPRAISED 0x00200000 60#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ 61 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \ 62 IMA_CREDS_APPRAISE) 63#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ 64 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \ 65 IMA_CREDS_APPRAISED) 66 67/* iint cache atomic_flags */ 68#define IMA_CHANGE_XATTR 0 69#define IMA_UPDATE_XATTR 1 70#define IMA_CHANGE_ATTR 2 71#define IMA_DIGSIG 3 72#define IMA_MUST_MEASURE 4 73 74enum evm_ima_xattr_type { 75 IMA_XATTR_DIGEST = 0x01, 76 EVM_XATTR_HMAC, 77 EVM_IMA_XATTR_DIGSIG, 78 IMA_XATTR_DIGEST_NG, 79 EVM_XATTR_PORTABLE_DIGSIG, 80 IMA_XATTR_LAST 81}; 82 83struct evm_ima_xattr_data { 84 u8 type; 85 u8 data[]; 86} __packed; 87 88/* Only used in the EVM HMAC code. */ 89struct evm_xattr { 90 struct evm_ima_xattr_data data; 91 u8 digest[SHA1_DIGEST_SIZE]; 92} __packed; 93 94#define IMA_MAX_DIGEST_SIZE 64 95 96struct ima_digest_data { 97 u8 algo; 98 u8 length; 99 union { 100 struct { 101 u8 unused; 102 u8 type; 103 } sha1; 104 struct { 105 u8 type; 106 u8 algo; 107 } ng; 108 u8 data[2]; 109 } xattr; 110 u8 digest[]; 111} __packed; 112 113/* 114 * signature format v2 - for using with asymmetric keys 115 */ 116struct signature_v2_hdr { 117 uint8_t type; /* xattr type */ 118 uint8_t version; /* signature format version */ 119 uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */ 120 __be32 keyid; /* IMA key identifier - not X509/PGP specific */ 121 __be16 sig_size; /* signature size */ 122 uint8_t sig[]; /* signature payload */ 123} __packed; 124 125/* integrity data associated with an inode */ 126struct integrity_iint_cache { 127 struct rb_node rb_node; /* rooted in integrity_iint_tree */ 128 struct mutex mutex; /* protects: version, flags, digest */ 129 struct inode *inode; /* back pointer to inode in question */ 130 u64 version; /* track inode changes */ 131 unsigned long flags; 132 unsigned long measured_pcrs; 133 unsigned long atomic_flags; 134 unsigned long real_ino; 135 dev_t real_dev; 136 enum integrity_status ima_file_status:4; 137 enum integrity_status ima_mmap_status:4; 138 enum integrity_status ima_bprm_status:4; 139 enum integrity_status ima_read_status:4; 140 enum integrity_status ima_creds_status:4; 141 enum integrity_status evm_status:4; 142 struct ima_digest_data *ima_hash; 143}; 144 145/* rbtree tree calls to lookup, insert, delete 146 * integrity data associated with an inode. 147 */ 148struct integrity_iint_cache *integrity_iint_find(struct inode *inode); 149 150int integrity_kernel_read(struct file *file, loff_t offset, 151 void *addr, unsigned long count); 152 153#define INTEGRITY_KEYRING_EVM 0 154#define INTEGRITY_KEYRING_IMA 1 155#define INTEGRITY_KEYRING_PLATFORM 2 156#define INTEGRITY_KEYRING_MAX 3 157 158extern struct dentry *integrity_dir; 159 160struct modsig; 161 162#ifdef CONFIG_INTEGRITY_SIGNATURE 163 164int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, 165 const char *digest, int digestlen); 166int integrity_modsig_verify(unsigned int id, const struct modsig *modsig); 167 168int __init integrity_init_keyring(const unsigned int id); 169int __init integrity_load_x509(const unsigned int id, const char *path); 170int __init integrity_load_cert(const unsigned int id, const char *source, 171 const void *data, size_t len, key_perm_t perm); 172#else 173 174static inline int integrity_digsig_verify(const unsigned int id, 175 const char *sig, int siglen, 176 const char *digest, int digestlen) 177{ 178 return -EOPNOTSUPP; 179} 180 181static inline int integrity_modsig_verify(unsigned int id, 182 const struct modsig *modsig) 183{ 184 return -EOPNOTSUPP; 185} 186 187static inline int integrity_init_keyring(const unsigned int id) 188{ 189 return 0; 190} 191 192static inline int __init integrity_load_cert(const unsigned int id, 193 const char *source, 194 const void *data, size_t len, 195 key_perm_t perm) 196{ 197 return 0; 198} 199#endif /* CONFIG_INTEGRITY_SIGNATURE */ 200 201#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS 202int asymmetric_verify(struct key *keyring, const char *sig, 203 int siglen, const char *data, int datalen); 204#else 205static inline int asymmetric_verify(struct key *keyring, const char *sig, 206 int siglen, const char *data, int datalen) 207{ 208 return -EOPNOTSUPP; 209} 210#endif 211 212#ifdef CONFIG_IMA_APPRAISE_MODSIG 213int ima_modsig_verify(struct key *keyring, const struct modsig *modsig); 214#else 215static inline int ima_modsig_verify(struct key *keyring, 216 const struct modsig *modsig) 217{ 218 return -EOPNOTSUPP; 219} 220#endif 221 222#ifdef CONFIG_IMA_LOAD_X509 223void __init ima_load_x509(void); 224#else 225static inline void ima_load_x509(void) 226{ 227} 228#endif 229 230#ifdef CONFIG_EVM_LOAD_X509 231void __init evm_load_x509(void); 232#else 233static inline void evm_load_x509(void) 234{ 235} 236#endif 237 238#ifdef CONFIG_INTEGRITY_AUDIT 239/* declarations */ 240void integrity_audit_msg(int audit_msgno, struct inode *inode, 241 const unsigned char *fname, const char *op, 242 const char *cause, int result, int info); 243 244void integrity_audit_message(int audit_msgno, struct inode *inode, 245 const unsigned char *fname, const char *op, 246 const char *cause, int result, int info, 247 int errno); 248 249static inline struct audit_buffer * 250integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) 251{ 252 return audit_log_start(ctx, gfp_mask, type); 253} 254 255#else 256static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, 257 const unsigned char *fname, 258 const char *op, const char *cause, 259 int result, int info) 260{ 261} 262 263static inline void integrity_audit_message(int audit_msgno, 264 struct inode *inode, 265 const unsigned char *fname, 266 const char *op, const char *cause, 267 int result, int info, int errno) 268{ 269} 270 271static inline struct audit_buffer * 272integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) 273{ 274 return NULL; 275} 276 277#endif 278 279#ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING 280void __init add_to_platform_keyring(const char *source, const void *data, 281 size_t len); 282#else 283static inline void __init add_to_platform_keyring(const char *source, 284 const void *data, size_t len) 285{ 286} 287#endif 288