1 /* 2 * Copyright (C) 2005,2006,2007,2008 IBM Corporation 3 * 4 * Authors: 5 * Reiner Sailer <sailer@watson.ibm.com> 6 * Mimi Zohar <zohar@us.ibm.com> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation, version 2 of the 11 * License. 12 * 13 * File: ima.h 14 * internal Integrity Measurement Architecture (IMA) definitions 15 */ 16 17 #ifndef __LINUX_IMA_H 18 #define __LINUX_IMA_H 19 20 #include <linux/types.h> 21 #include <linux/crypto.h> 22 #include <linux/security.h> 23 #include <linux/hash.h> 24 #include <linux/tpm.h> 25 #include <linux/audit.h> 26 27 #include "../integrity.h" 28 29 enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII }; 30 enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 }; 31 32 /* digest size for IMA, fits SHA1 or MD5 */ 33 #define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE 34 #define IMA_EVENT_NAME_LEN_MAX 255 35 36 #define IMA_HASH_BITS 9 37 #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS) 38 39 /* set during initialization */ 40 extern int ima_initialized; 41 extern int ima_used_chip; 42 extern int ima_hash_algo; 43 extern int ima_appraise; 44 45 /* IMA inode template definition */ 46 struct ima_template_data { 47 u8 digest[IMA_DIGEST_SIZE]; /* sha1/md5 measurement hash */ 48 char file_name[IMA_EVENT_NAME_LEN_MAX + 1]; /* name + \0 */ 49 }; 50 51 struct ima_template_entry { 52 u8 digest[IMA_DIGEST_SIZE]; /* sha1 or md5 measurement hash */ 53 const char *template_name; 54 int template_len; 55 struct ima_template_data template; 56 }; 57 58 struct ima_queue_entry { 59 struct hlist_node hnext; /* place in hash collision list */ 60 struct list_head later; /* place in ima_measurements list */ 61 struct ima_template_entry *entry; 62 }; 63 extern struct list_head ima_measurements; /* list of all measurements */ 64 65 /* Internal IMA function definitions */ 66 int ima_init(void); 67 void ima_cleanup(void); 68 int ima_fs_init(void); 69 void ima_fs_cleanup(void); 70 int ima_inode_alloc(struct inode *inode); 71 int ima_add_template_entry(struct ima_template_entry *entry, int violation, 72 const char *op, struct inode *inode); 73 int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash); 74 int ima_calc_buffer_hash(const void *data, int len, 75 struct ima_digest_data *hash); 76 int ima_calc_boot_aggregate(char *digest); 77 void ima_add_violation(struct inode *inode, const unsigned char *filename, 78 const char *op, const char *cause); 79 int ima_init_crypto(void); 80 81 /* 82 * used to protect h_table and sha_table 83 */ 84 extern spinlock_t ima_queue_lock; 85 86 struct ima_h_table { 87 atomic_long_t len; /* number of stored measurements in the list */ 88 atomic_long_t violations; 89 struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; 90 }; 91 extern struct ima_h_table ima_htable; 92 93 static inline unsigned long ima_hash_key(u8 *digest) 94 { 95 return hash_long(*digest, IMA_HASH_BITS); 96 } 97 98 /* LIM API function definitions */ 99 int ima_get_action(struct inode *inode, int mask, int function); 100 int ima_must_measure(struct inode *inode, int mask, int function); 101 int ima_collect_measurement(struct integrity_iint_cache *iint, 102 struct file *file); 103 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, 104 const unsigned char *filename); 105 void ima_audit_measurement(struct integrity_iint_cache *iint, 106 const unsigned char *filename); 107 int ima_store_template(struct ima_template_entry *entry, int violation, 108 struct inode *inode); 109 void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show); 110 const char *ima_d_path(struct path *path, char **pathbuf); 111 112 /* rbtree tree calls to lookup, insert, delete 113 * integrity data associated with an inode. 114 */ 115 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); 116 struct integrity_iint_cache *integrity_iint_find(struct inode *inode); 117 118 /* IMA policy related functions */ 119 enum ima_hooks { FILE_CHECK = 1, MMAP_CHECK, BPRM_CHECK, MODULE_CHECK, POST_SETATTR }; 120 121 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask, 122 int flags); 123 void ima_init_policy(void); 124 void ima_update_policy(void); 125 ssize_t ima_parse_add_rule(char *); 126 void ima_delete_rules(void); 127 128 /* Appraise integrity measurements */ 129 #define IMA_APPRAISE_ENFORCE 0x01 130 #define IMA_APPRAISE_FIX 0x02 131 #define IMA_APPRAISE_MODULES 0x04 132 133 #ifdef CONFIG_IMA_APPRAISE 134 int ima_appraise_measurement(int func, struct integrity_iint_cache *iint, 135 struct file *file, const unsigned char *filename); 136 int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func); 137 void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file); 138 enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint, 139 int func); 140 141 #else 142 static inline int ima_appraise_measurement(int func, 143 struct integrity_iint_cache *iint, 144 struct file *file, 145 const unsigned char *filename) 146 { 147 return INTEGRITY_UNKNOWN; 148 } 149 150 static inline int ima_must_appraise(struct inode *inode, int mask, 151 enum ima_hooks func) 152 { 153 return 0; 154 } 155 156 static inline void ima_update_xattr(struct integrity_iint_cache *iint, 157 struct file *file) 158 { 159 } 160 161 static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache 162 *iint, int func) 163 { 164 return INTEGRITY_UNKNOWN; 165 } 166 #endif 167 168 /* LSM based policy rules require audit */ 169 #ifdef CONFIG_IMA_LSM_RULES 170 171 #define security_filter_rule_init security_audit_rule_init 172 #define security_filter_rule_match security_audit_rule_match 173 174 #else 175 176 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, 177 void **lsmrule) 178 { 179 return -EINVAL; 180 } 181 182 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, 183 void *lsmrule, 184 struct audit_context *actx) 185 { 186 return -EINVAL; 187 } 188 #endif /* CONFIG_IMA_LSM_RULES */ 189 #endif 190