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 34 #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ 35 IMA_APPRAISE_SUBMASK) 36 #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ 37 IMA_COLLECTED | IMA_APPRAISED_SUBMASK) 38 39 /* iint subaction appraise cache flags */ 40 #define IMA_FILE_APPRAISE 0x00000100 41 #define IMA_FILE_APPRAISED 0x00000200 42 #define IMA_MMAP_APPRAISE 0x00000400 43 #define IMA_MMAP_APPRAISED 0x00000800 44 #define IMA_BPRM_APPRAISE 0x00001000 45 #define IMA_BPRM_APPRAISED 0x00002000 46 #define IMA_MODULE_APPRAISE 0x00004000 47 #define IMA_MODULE_APPRAISED 0x00008000 48 #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ 49 IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE) 50 #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ 51 IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED) 52 53 enum evm_ima_xattr_type { 54 IMA_XATTR_DIGEST = 0x01, 55 EVM_XATTR_HMAC, 56 EVM_IMA_XATTR_DIGSIG, 57 }; 58 59 struct evm_ima_xattr_data { 60 u8 type; 61 u8 digest[SHA1_DIGEST_SIZE]; 62 } __attribute__((packed)); 63 64 /* integrity data associated with an inode */ 65 struct integrity_iint_cache { 66 struct rb_node rb_node; /* rooted in integrity_iint_tree */ 67 struct inode *inode; /* back pointer to inode in question */ 68 u64 version; /* track inode changes */ 69 unsigned long flags; 70 struct evm_ima_xattr_data ima_xattr; 71 enum integrity_status ima_file_status:4; 72 enum integrity_status ima_mmap_status:4; 73 enum integrity_status ima_bprm_status:4; 74 enum integrity_status ima_module_status:4; 75 enum integrity_status evm_status:4; 76 }; 77 78 /* rbtree tree calls to lookup, insert, delete 79 * integrity data associated with an inode. 80 */ 81 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); 82 struct integrity_iint_cache *integrity_iint_find(struct inode *inode); 83 84 #define INTEGRITY_KEYRING_EVM 0 85 #define INTEGRITY_KEYRING_MODULE 1 86 #define INTEGRITY_KEYRING_IMA 2 87 #define INTEGRITY_KEYRING_MAX 3 88 89 #ifdef CONFIG_INTEGRITY_SIGNATURE 90 91 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, 92 const char *digest, int digestlen); 93 94 #else 95 96 static inline int integrity_digsig_verify(const unsigned int id, 97 const char *sig, int siglen, 98 const char *digest, int digestlen) 99 { 100 return -EOPNOTSUPP; 101 } 102 103 #endif /* CONFIG_INTEGRITY_SIGNATURE */ 104 105 #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS 106 int asymmetric_verify(struct key *keyring, const char *sig, 107 int siglen, const char *data, int datalen); 108 #else 109 static inline int asymmetric_verify(struct key *keyring, const char *sig, 110 int siglen, const char *data, int datalen) 111 { 112 return -EOPNOTSUPP; 113 } 114 #endif 115 116 #ifdef CONFIG_INTEGRITY_AUDIT 117 /* declarations */ 118 void integrity_audit_msg(int audit_msgno, struct inode *inode, 119 const unsigned char *fname, const char *op, 120 const char *cause, int result, int info); 121 #else 122 static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, 123 const unsigned char *fname, 124 const char *op, const char *cause, 125 int result, int info) 126 { 127 } 128 #endif 129 130 /* set during initialization */ 131 extern int iint_initialized; 132