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 char *ima_hash; 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 #ifdef CONFIG_IMA_AUDIT 66 /* declarations */ 67 void integrity_audit_msg(int audit_msgno, struct inode *inode, 68 const unsigned char *fname, const char *op, 69 const char *cause, int result, int info); 70 #else 71 static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, 72 const unsigned char *fname, 73 const char *op, const char *cause, 74 int result, int info) 75 { 76 } 77 #endif 78 79 /* Internal IMA function definitions */ 80 int ima_init(void); 81 void ima_cleanup(void); 82 int ima_fs_init(void); 83 void ima_fs_cleanup(void); 84 int ima_inode_alloc(struct inode *inode); 85 int ima_add_template_entry(struct ima_template_entry *entry, int violation, 86 const char *op, struct inode *inode); 87 int ima_calc_file_hash(struct file *file, char *digest); 88 int ima_calc_buffer_hash(const void *data, int len, char *digest); 89 int ima_calc_boot_aggregate(char *digest); 90 void ima_add_violation(struct inode *inode, const unsigned char *filename, 91 const char *op, const char *cause); 92 int ima_init_crypto(void); 93 94 /* 95 * used to protect h_table and sha_table 96 */ 97 extern spinlock_t ima_queue_lock; 98 99 struct ima_h_table { 100 atomic_long_t len; /* number of stored measurements in the list */ 101 atomic_long_t violations; 102 struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; 103 }; 104 extern struct ima_h_table ima_htable; 105 106 static inline unsigned long ima_hash_key(u8 *digest) 107 { 108 return hash_long(*digest, IMA_HASH_BITS); 109 } 110 111 /* LIM API function definitions */ 112 int ima_get_action(struct inode *inode, int mask, int function); 113 int ima_must_measure(struct inode *inode, int mask, int function); 114 int ima_collect_measurement(struct integrity_iint_cache *iint, 115 struct file *file); 116 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, 117 const unsigned char *filename); 118 void ima_audit_measurement(struct integrity_iint_cache *iint, 119 const unsigned char *filename); 120 int ima_store_template(struct ima_template_entry *entry, int violation, 121 struct inode *inode); 122 void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show); 123 const char *ima_d_path(struct path *path, char **pathbuf); 124 125 /* rbtree tree calls to lookup, insert, delete 126 * integrity data associated with an inode. 127 */ 128 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); 129 struct integrity_iint_cache *integrity_iint_find(struct inode *inode); 130 131 /* IMA policy related functions */ 132 enum ima_hooks { FILE_CHECK = 1, MMAP_CHECK, BPRM_CHECK, MODULE_CHECK, POST_SETATTR }; 133 134 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask, 135 int flags); 136 void ima_init_policy(void); 137 void ima_update_policy(void); 138 ssize_t ima_parse_add_rule(char *); 139 void ima_delete_rules(void); 140 141 /* Appraise integrity measurements */ 142 #define IMA_APPRAISE_ENFORCE 0x01 143 #define IMA_APPRAISE_FIX 0x02 144 #define IMA_APPRAISE_MODULES 0x04 145 146 #ifdef CONFIG_IMA_APPRAISE 147 int ima_appraise_measurement(int func, struct integrity_iint_cache *iint, 148 struct file *file, const unsigned char *filename); 149 int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func); 150 void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file); 151 enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint, 152 int func); 153 154 #else 155 static inline int ima_appraise_measurement(int func, 156 struct integrity_iint_cache *iint, 157 struct file *file, 158 const unsigned char *filename) 159 { 160 return INTEGRITY_UNKNOWN; 161 } 162 163 static inline int ima_must_appraise(struct inode *inode, int mask, 164 enum ima_hooks func) 165 { 166 return 0; 167 } 168 169 static inline void ima_update_xattr(struct integrity_iint_cache *iint, 170 struct file *file) 171 { 172 } 173 174 static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache 175 *iint, int func) 176 { 177 return INTEGRITY_UNKNOWN; 178 } 179 #endif 180 181 /* LSM based policy rules require audit */ 182 #ifdef CONFIG_IMA_LSM_RULES 183 184 #define security_filter_rule_init security_audit_rule_init 185 #define security_filter_rule_match security_audit_rule_match 186 187 #else 188 189 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, 190 void **lsmrule) 191 { 192 return -EINVAL; 193 } 194 195 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, 196 void *lsmrule, 197 struct audit_context *actx) 198 { 199 return -EINVAL; 200 } 201 #endif /* CONFIG_IMA_LSM_RULES */ 202 #endif 203