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_BINARY_NO_FIELD_LEN, 30 IMA_SHOW_BINARY_OLD_STRING_FMT, IMA_SHOW_ASCII }; 31 enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 }; 32 33 /* digest size for IMA, fits SHA1 or MD5 */ 34 #define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE 35 #define IMA_EVENT_NAME_LEN_MAX 255 36 37 #define IMA_HASH_BITS 9 38 #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS) 39 40 #define IMA_TEMPLATE_FIELD_ID_MAX_LEN 16 41 #define IMA_TEMPLATE_NUM_FIELDS_MAX 15 42 43 #define IMA_TEMPLATE_IMA_NAME "ima" 44 #define IMA_TEMPLATE_IMA_FMT "d|n" 45 46 /* current content of the policy */ 47 extern int ima_policy_flag; 48 49 /* set during initialization */ 50 extern int ima_initialized; 51 extern int ima_used_chip; 52 extern int ima_hash_algo; 53 extern int ima_appraise; 54 55 /* IMA template field data definition */ 56 struct ima_field_data { 57 u8 *data; 58 u32 len; 59 }; 60 61 /* IMA template field definition */ 62 struct ima_template_field { 63 const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN]; 64 int (*field_init) (struct integrity_iint_cache *iint, struct file *file, 65 const unsigned char *filename, 66 struct evm_ima_xattr_data *xattr_value, 67 int xattr_len, struct ima_field_data *field_data); 68 void (*field_show) (struct seq_file *m, enum ima_show_type show, 69 struct ima_field_data *field_data); 70 }; 71 72 /* IMA template descriptor definition */ 73 struct ima_template_desc { 74 char *name; 75 char *fmt; 76 int num_fields; 77 struct ima_template_field **fields; 78 }; 79 80 struct ima_template_entry { 81 u8 digest[TPM_DIGEST_SIZE]; /* sha1 or md5 measurement hash */ 82 struct ima_template_desc *template_desc; /* template descriptor */ 83 u32 template_data_len; 84 struct ima_field_data template_data[0]; /* template related data */ 85 }; 86 87 struct ima_queue_entry { 88 struct hlist_node hnext; /* place in hash collision list */ 89 struct list_head later; /* place in ima_measurements list */ 90 struct ima_template_entry *entry; 91 }; 92 extern struct list_head ima_measurements; /* list of all measurements */ 93 94 /* Internal IMA function definitions */ 95 int ima_init(void); 96 int ima_fs_init(void); 97 int ima_add_template_entry(struct ima_template_entry *entry, int violation, 98 const char *op, struct inode *inode, 99 const unsigned char *filename); 100 int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash); 101 int ima_calc_field_array_hash(struct ima_field_data *field_data, 102 struct ima_template_desc *desc, int num_fields, 103 struct ima_digest_data *hash); 104 int __init ima_calc_boot_aggregate(struct ima_digest_data *hash); 105 void ima_add_violation(struct file *file, const unsigned char *filename, 106 const char *op, const char *cause); 107 int ima_init_crypto(void); 108 void ima_putc(struct seq_file *m, void *data, int datalen); 109 void ima_print_digest(struct seq_file *m, u8 *digest, int size); 110 struct ima_template_desc *ima_template_desc_current(void); 111 int ima_init_template(void); 112 113 /* 114 * used to protect h_table and sha_table 115 */ 116 extern spinlock_t ima_queue_lock; 117 118 struct ima_h_table { 119 atomic_long_t len; /* number of stored measurements in the list */ 120 atomic_long_t violations; 121 struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; 122 }; 123 extern struct ima_h_table ima_htable; 124 125 static inline unsigned long ima_hash_key(u8 *digest) 126 { 127 return hash_long(*digest, IMA_HASH_BITS); 128 } 129 130 /* LIM API function definitions */ 131 int ima_get_action(struct inode *inode, int mask, int function); 132 int ima_must_measure(struct inode *inode, int mask, int function); 133 int ima_collect_measurement(struct integrity_iint_cache *iint, 134 struct file *file, 135 struct evm_ima_xattr_data **xattr_value, 136 int *xattr_len); 137 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, 138 const unsigned char *filename, 139 struct evm_ima_xattr_data *xattr_value, 140 int xattr_len); 141 void ima_audit_measurement(struct integrity_iint_cache *iint, 142 const unsigned char *filename); 143 int ima_alloc_init_template(struct integrity_iint_cache *iint, 144 struct file *file, const unsigned char *filename, 145 struct evm_ima_xattr_data *xattr_value, 146 int xattr_len, struct ima_template_entry **entry); 147 int ima_store_template(struct ima_template_entry *entry, int violation, 148 struct inode *inode, const unsigned char *filename); 149 void ima_free_template_entry(struct ima_template_entry *entry); 150 const char *ima_d_path(struct path *path, char **pathbuf); 151 152 /* IMA policy related functions */ 153 enum ima_hooks { FILE_CHECK = 1, MMAP_CHECK, BPRM_CHECK, MODULE_CHECK, FIRMWARE_CHECK, POST_SETATTR }; 154 155 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask, 156 int flags); 157 void ima_init_policy(void); 158 void ima_update_policy(void); 159 void ima_update_policy_flag(void); 160 ssize_t ima_parse_add_rule(char *); 161 void ima_delete_rules(void); 162 163 /* Appraise integrity measurements */ 164 #define IMA_APPRAISE_ENFORCE 0x01 165 #define IMA_APPRAISE_FIX 0x02 166 #define IMA_APPRAISE_LOG 0x04 167 #define IMA_APPRAISE_MODULES 0x08 168 #define IMA_APPRAISE_FIRMWARE 0x10 169 170 #ifdef CONFIG_IMA_APPRAISE 171 int ima_appraise_measurement(int func, struct integrity_iint_cache *iint, 172 struct file *file, const unsigned char *filename, 173 struct evm_ima_xattr_data *xattr_value, 174 int xattr_len, int opened); 175 int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func); 176 void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file); 177 enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint, 178 int func); 179 void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len, 180 struct ima_digest_data *hash); 181 int ima_read_xattr(struct dentry *dentry, 182 struct evm_ima_xattr_data **xattr_value); 183 184 #else 185 static inline int ima_appraise_measurement(int func, 186 struct integrity_iint_cache *iint, 187 struct file *file, 188 const unsigned char *filename, 189 struct evm_ima_xattr_data *xattr_value, 190 int xattr_len, int opened) 191 { 192 return INTEGRITY_UNKNOWN; 193 } 194 195 static inline int ima_must_appraise(struct inode *inode, int mask, 196 enum ima_hooks func) 197 { 198 return 0; 199 } 200 201 static inline void ima_update_xattr(struct integrity_iint_cache *iint, 202 struct file *file) 203 { 204 } 205 206 static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache 207 *iint, int func) 208 { 209 return INTEGRITY_UNKNOWN; 210 } 211 212 static inline void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, 213 int xattr_len, 214 struct ima_digest_data *hash) 215 { 216 } 217 218 static inline int ima_read_xattr(struct dentry *dentry, 219 struct evm_ima_xattr_data **xattr_value) 220 { 221 return 0; 222 } 223 224 #endif 225 226 /* LSM based policy rules require audit */ 227 #ifdef CONFIG_IMA_LSM_RULES 228 229 #define security_filter_rule_init security_audit_rule_init 230 #define security_filter_rule_match security_audit_rule_match 231 232 #else 233 234 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, 235 void **lsmrule) 236 { 237 return -EINVAL; 238 } 239 240 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, 241 void *lsmrule, 242 struct audit_context *actx) 243 { 244 return -EINVAL; 245 } 246 #endif /* CONFIG_IMA_LSM_RULES */ 247 248 #ifdef CONFIG_IMA_TRUSTED_KEYRING 249 static inline int ima_init_keyring(const unsigned int id) 250 { 251 return integrity_init_keyring(id); 252 } 253 #else 254 static inline int ima_init_keyring(const unsigned int id) 255 { 256 return 0; 257 } 258 #endif /* CONFIG_IMA_TRUSTED_KEYRING */ 259 #endif 260