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 44 /* IMA inode template definition */ 45 struct ima_template_data { 46 u8 digest[IMA_DIGEST_SIZE]; /* sha1/md5 measurement hash */ 47 char file_name[IMA_EVENT_NAME_LEN_MAX + 1]; /* name + \0 */ 48 }; 49 50 struct ima_template_entry { 51 u8 digest[IMA_DIGEST_SIZE]; /* sha1 or md5 measurement hash */ 52 const char *template_name; 53 int template_len; 54 struct ima_template_data template; 55 }; 56 57 struct ima_queue_entry { 58 struct hlist_node hnext; /* place in hash collision list */ 59 struct list_head later; /* place in ima_measurements list */ 60 struct ima_template_entry *entry; 61 }; 62 extern struct list_head ima_measurements; /* list of all measurements */ 63 64 #ifdef CONFIG_IMA_AUDIT 65 /* declarations */ 66 void integrity_audit_msg(int audit_msgno, struct inode *inode, 67 const unsigned char *fname, const char *op, 68 const char *cause, int result, int info); 69 #else 70 static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, 71 const unsigned char *fname, 72 const char *op, const char *cause, 73 int result, int info) 74 { 75 } 76 #endif 77 78 /* Internal IMA function definitions */ 79 int ima_init(void); 80 void ima_cleanup(void); 81 int ima_fs_init(void); 82 void ima_fs_cleanup(void); 83 int ima_inode_alloc(struct inode *inode); 84 int ima_add_template_entry(struct ima_template_entry *entry, int violation, 85 const char *op, struct inode *inode); 86 int ima_calc_hash(struct file *file, char *digest); 87 int ima_calc_template_hash(int template_len, void *template, char *digest); 88 int ima_calc_boot_aggregate(char *digest); 89 void ima_add_violation(struct inode *inode, const unsigned char *filename, 90 const char *op, const char *cause); 91 92 /* 93 * used to protect h_table and sha_table 94 */ 95 extern spinlock_t ima_queue_lock; 96 97 struct ima_h_table { 98 atomic_long_t len; /* number of stored measurements in the list */ 99 atomic_long_t violations; 100 struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; 101 }; 102 extern struct ima_h_table ima_htable; 103 104 static inline unsigned long ima_hash_key(u8 *digest) 105 { 106 return hash_long(*digest, IMA_HASH_BITS); 107 } 108 109 /* LIM API function definitions */ 110 int ima_must_measure(struct inode *inode, int mask, int function); 111 int ima_collect_measurement(struct integrity_iint_cache *iint, 112 struct file *file); 113 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, 114 const unsigned char *filename); 115 int ima_store_template(struct ima_template_entry *entry, int violation, 116 struct inode *inode); 117 void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show); 118 119 /* rbtree tree calls to lookup, insert, delete 120 * integrity data associated with an inode. 121 */ 122 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); 123 struct integrity_iint_cache *integrity_iint_find(struct inode *inode); 124 125 /* IMA policy related functions */ 126 enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK }; 127 128 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask); 129 void ima_init_policy(void); 130 void ima_update_policy(void); 131 ssize_t ima_parse_add_rule(char *); 132 void ima_delete_rules(void); 133 134 /* LSM based policy rules require audit */ 135 #ifdef CONFIG_IMA_LSM_RULES 136 137 #define security_filter_rule_init security_audit_rule_init 138 #define security_filter_rule_match security_audit_rule_match 139 140 #else 141 142 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, 143 void **lsmrule) 144 { 145 return -EINVAL; 146 } 147 148 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, 149 void *lsmrule, 150 struct audit_context *actx) 151 { 152 return -EINVAL; 153 } 154 #endif /* CONFIG_IMA_LSM_RULES */ 155 #endif 156