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