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 enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII }; 28 enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 }; 29 30 /* digest size for IMA, fits SHA1 or MD5 */ 31 #define IMA_DIGEST_SIZE 20 32 #define IMA_EVENT_NAME_LEN_MAX 255 33 34 #define IMA_HASH_BITS 9 35 #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS) 36 37 /* set during initialization */ 38 extern int ima_initialized; 39 extern int ima_used_chip; 40 extern char *ima_hash; 41 42 /* IMA inode template definition */ 43 struct ima_template_data { 44 u8 digest[IMA_DIGEST_SIZE]; /* sha1/md5 measurement hash */ 45 char file_name[IMA_EVENT_NAME_LEN_MAX + 1]; /* name + \0 */ 46 }; 47 48 struct ima_template_entry { 49 u8 digest[IMA_DIGEST_SIZE]; /* sha1 or md5 measurement hash */ 50 char *template_name; 51 int template_len; 52 struct ima_template_data template; 53 }; 54 55 struct ima_queue_entry { 56 struct hlist_node hnext; /* place in hash collision list */ 57 struct list_head later; /* place in ima_measurements list */ 58 struct ima_template_entry *entry; 59 }; 60 extern struct list_head ima_measurements; /* list of all measurements */ 61 62 /* declarations */ 63 void integrity_audit_msg(int audit_msgno, struct inode *inode, 64 const unsigned char *fname, const char *op, 65 const char *cause, int result, int info); 66 67 /* Internal IMA function definitions */ 68 void ima_iintcache_init(void); 69 int ima_init(void); 70 void ima_cleanup(void); 71 int ima_fs_init(void); 72 void ima_fs_cleanup(void); 73 int ima_add_template_entry(struct ima_template_entry *entry, int violation, 74 const char *op, struct inode *inode); 75 int ima_calc_hash(struct file *file, char *digest); 76 int ima_calc_template_hash(int template_len, void *template, char *digest); 77 int ima_calc_boot_aggregate(char *digest); 78 void ima_add_violation(struct inode *inode, const unsigned char *filename, 79 const char *op, const char *cause); 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 /* iint cache flags */ 99 #define IMA_MEASURED 1 100 101 /* integrity data associated with an inode */ 102 struct ima_iint_cache { 103 u64 version; /* track inode changes */ 104 unsigned long flags; 105 u8 digest[IMA_DIGEST_SIZE]; 106 struct mutex mutex; /* protects: version, flags, digest */ 107 long readcount; /* measured files readcount */ 108 long writecount; /* measured files writecount */ 109 struct kref refcount; /* ima_iint_cache reference count */ 110 struct rcu_head rcu; 111 }; 112 113 /* LIM API function definitions */ 114 int ima_must_measure(struct ima_iint_cache *iint, struct inode *inode, 115 int mask, int function); 116 int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file); 117 void ima_store_measurement(struct ima_iint_cache *iint, struct file *file, 118 const unsigned char *filename); 119 int ima_store_template(struct ima_template_entry *entry, int violation, 120 struct inode *inode); 121 void ima_template_show(struct seq_file *m, void *e, 122 enum ima_show_type show); 123 124 /* radix tree calls to lookup, insert, delete 125 * integrity data associated with an inode. 126 */ 127 struct ima_iint_cache *ima_iint_insert(struct inode *inode); 128 struct ima_iint_cache *ima_iint_find_get(struct inode *inode); 129 struct ima_iint_cache *ima_iint_find_insert_get(struct inode *inode); 130 void ima_iint_delete(struct inode *inode); 131 void iint_free(struct kref *kref); 132 void iint_rcu_free(struct rcu_head *rcu); 133 134 /* IMA policy related functions */ 135 enum ima_hooks { PATH_CHECK = 1, FILE_MMAP, BPRM_CHECK }; 136 137 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask); 138 void ima_init_policy(void); 139 void ima_update_policy(void); 140 int ima_parse_add_rule(char *); 141 void ima_delete_rules(void); 142 143 /* LSM based policy rules require audit */ 144 #ifdef CONFIG_IMA_LSM_RULES 145 146 #define security_filter_rule_init security_audit_rule_init 147 #define security_filter_rule_match security_audit_rule_match 148 149 #else 150 151 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, 152 void **lsmrule) 153 { 154 return -EINVAL; 155 } 156 157 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, 158 void *lsmrule, 159 struct audit_context *actx) 160 { 161 return -EINVAL; 162 } 163 #endif /* CONFIG_IMA_LSM_RULES */ 164 #endif 165