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 const 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 int ima_init(void); 69 void ima_cleanup(void); 70 int ima_fs_init(void); 71 void ima_fs_cleanup(void); 72 int ima_add_template_entry(struct ima_template_entry *entry, int violation, 73 const char *op, struct inode *inode); 74 int ima_calc_hash(struct file *file, char *digest); 75 int ima_calc_template_hash(int template_len, void *template, char *digest); 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 80 /* 81 * used to protect h_table and sha_table 82 */ 83 extern spinlock_t ima_queue_lock; 84 85 struct ima_h_table { 86 atomic_long_t len; /* number of stored measurements in the list */ 87 atomic_long_t violations; 88 struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; 89 }; 90 extern struct ima_h_table ima_htable; 91 92 static inline unsigned long ima_hash_key(u8 *digest) 93 { 94 return hash_long(*digest, IMA_HASH_BITS); 95 } 96 97 /* iint cache flags */ 98 #define IMA_MEASURED 1 99 100 /* integrity data associated with an inode */ 101 struct ima_iint_cache { 102 u64 version; /* track inode changes */ 103 unsigned long flags; 104 u8 digest[IMA_DIGEST_SIZE]; 105 struct mutex mutex; /* protects: version, flags, digest */ 106 long readcount; /* measured files readcount */ 107 long writecount; /* measured files writecount */ 108 long opencount; /* opens reference count */ 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 void iint_free(struct kref *kref); 130 void iint_rcu_free(struct rcu_head *rcu); 131 132 /* IMA policy related functions */ 133 enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK }; 134 135 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask); 136 void ima_init_policy(void); 137 void ima_update_policy(void); 138 int ima_parse_add_rule(char *); 139 void ima_delete_rules(void); 140 141 /* LSM based policy rules require audit */ 142 #ifdef CONFIG_IMA_LSM_RULES 143 144 #define security_filter_rule_init security_audit_rule_init 145 #define security_filter_rule_match security_audit_rule_match 146 147 #else 148 149 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, 150 void **lsmrule) 151 { 152 return -EINVAL; 153 } 154 155 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, 156 void *lsmrule, 157 struct audit_context *actx) 158 { 159 return -EINVAL; 160 } 161 #endif /* CONFIG_IMA_LSM_RULES */ 162 #endif 163