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