2 * Copyright (C) 2005,2006,2007,2008 IBM Corporation
5 * Reiner Sailer <sailer@watson.ibm.com>
6 * Mimi Zohar <zohar@us.ibm.com>
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
14 * internal Integrity Measurement Architecture (IMA) definitions
20 #include <linux/types.h>
21 #include <linux/crypto.h>
23 #include <linux/security.h>
24 #include <linux/hash.h>
25 #include <linux/tpm.h>
26 #include <linux/audit.h>
27 #include <crypto/hash_info.h>
29 #include "../integrity.h"
31 enum ima_show_type
{ IMA_SHOW_BINARY
, IMA_SHOW_BINARY_NO_FIELD_LEN
,
32 IMA_SHOW_BINARY_OLD_STRING_FMT
, IMA_SHOW_ASCII
};
33 enum tpm_pcrs
{ TPM_PCR0
= 0, TPM_PCR8
= 8 };
35 /* digest size for IMA, fits SHA1 or MD5 */
36 #define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE
37 #define IMA_EVENT_NAME_LEN_MAX 255
39 #define IMA_HASH_BITS 9
40 #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
42 #define IMA_TEMPLATE_FIELD_ID_MAX_LEN 16
43 #define IMA_TEMPLATE_NUM_FIELDS_MAX 15
45 #define IMA_TEMPLATE_IMA_NAME "ima"
46 #define IMA_TEMPLATE_IMA_FMT "d|n"
48 /* current content of the policy */
49 extern int ima_policy_flag
;
51 /* set during initialization */
52 extern int ima_initialized
;
53 extern int ima_used_chip
;
54 extern int ima_hash_algo
;
55 extern int ima_appraise
;
57 /* IMA event related data */
58 struct ima_event_data
{
59 struct integrity_iint_cache
*iint
;
61 const unsigned char *filename
;
62 struct evm_ima_xattr_data
*xattr_value
;
64 const char *violation
;
67 /* IMA template field data definition */
68 struct ima_field_data
{
73 /* IMA template field definition */
74 struct ima_template_field
{
75 const char field_id
[IMA_TEMPLATE_FIELD_ID_MAX_LEN
];
76 int (*field_init
)(struct ima_event_data
*event_data
,
77 struct ima_field_data
*field_data
);
78 void (*field_show
)(struct seq_file
*m
, enum ima_show_type show
,
79 struct ima_field_data
*field_data
);
82 /* IMA template descriptor definition */
83 struct ima_template_desc
{
87 struct ima_template_field
**fields
;
90 struct ima_template_entry
{
92 u8 digest
[TPM_DIGEST_SIZE
]; /* sha1 or md5 measurement hash */
93 struct ima_template_desc
*template_desc
; /* template descriptor */
94 u32 template_data_len
;
95 struct ima_field_data template_data
[0]; /* template related data */
98 struct ima_queue_entry
{
99 struct hlist_node hnext
; /* place in hash collision list */
100 struct list_head later
; /* place in ima_measurements list */
101 struct ima_template_entry
*entry
;
103 extern struct list_head ima_measurements
; /* list of all measurements */
105 /* Internal IMA function definitions */
107 int ima_fs_init(void);
108 int ima_add_template_entry(struct ima_template_entry
*entry
, int violation
,
109 const char *op
, struct inode
*inode
,
110 const unsigned char *filename
);
111 int ima_calc_file_hash(struct file
*file
, struct ima_digest_data
*hash
);
112 int ima_calc_buffer_hash(const void *buf
, loff_t len
,
113 struct ima_digest_data
*hash
);
114 int ima_calc_field_array_hash(struct ima_field_data
*field_data
,
115 struct ima_template_desc
*desc
, int num_fields
,
116 struct ima_digest_data
*hash
);
117 int __init
ima_calc_boot_aggregate(struct ima_digest_data
*hash
);
118 void ima_add_violation(struct file
*file
, const unsigned char *filename
,
119 struct integrity_iint_cache
*iint
,
120 const char *op
, const char *cause
);
121 int ima_init_crypto(void);
122 void ima_putc(struct seq_file
*m
, void *data
, int datalen
);
123 void ima_print_digest(struct seq_file
*m
, u8
*digest
, u32 size
);
124 struct ima_template_desc
*ima_template_desc_current(void);
125 int ima_init_template(void);
128 * used to protect h_table and sha_table
130 extern spinlock_t ima_queue_lock
;
133 atomic_long_t len
; /* number of stored measurements in the list */
134 atomic_long_t violations
;
135 struct hlist_head queue
[IMA_MEASURE_HTABLE_SIZE
];
137 extern struct ima_h_table ima_htable
;
139 static inline unsigned long ima_hash_key(u8
*digest
)
141 return hash_long(*digest
, IMA_HASH_BITS
);
152 KEXEC_INITRAMFS_CHECK
,
157 /* LIM API function definitions */
158 int ima_get_action(struct inode
*inode
, int mask
,
159 enum ima_hooks func
, int *pcr
);
160 int ima_must_measure(struct inode
*inode
, int mask
, enum ima_hooks func
);
161 int ima_collect_measurement(struct integrity_iint_cache
*iint
,
162 struct file
*file
, void *buf
, loff_t size
,
163 enum hash_algo algo
);
164 void ima_store_measurement(struct integrity_iint_cache
*iint
, struct file
*file
,
165 const unsigned char *filename
,
166 struct evm_ima_xattr_data
*xattr_value
,
167 int xattr_len
, int pcr
);
168 void ima_audit_measurement(struct integrity_iint_cache
*iint
,
169 const unsigned char *filename
);
170 int ima_alloc_init_template(struct ima_event_data
*event_data
,
171 struct ima_template_entry
**entry
);
172 int ima_store_template(struct ima_template_entry
*entry
, int violation
,
174 const unsigned char *filename
, int pcr
);
175 void ima_free_template_entry(struct ima_template_entry
*entry
);
176 const char *ima_d_path(const struct path
*path
, char **pathbuf
);
178 /* IMA policy related functions */
179 int ima_match_policy(struct inode
*inode
, enum ima_hooks func
, int mask
,
180 int flags
, int *pcr
);
181 void ima_init_policy(void);
182 void ima_update_policy(void);
183 void ima_update_policy_flag(void);
184 ssize_t
ima_parse_add_rule(char *);
185 void ima_delete_rules(void);
186 int ima_check_policy(void);
187 void *ima_policy_start(struct seq_file
*m
, loff_t
*pos
);
188 void *ima_policy_next(struct seq_file
*m
, void *v
, loff_t
*pos
);
189 void ima_policy_stop(struct seq_file
*m
, void *v
);
190 int ima_policy_show(struct seq_file
*m
, void *v
);
192 /* Appraise integrity measurements */
193 #define IMA_APPRAISE_ENFORCE 0x01
194 #define IMA_APPRAISE_FIX 0x02
195 #define IMA_APPRAISE_LOG 0x04
196 #define IMA_APPRAISE_MODULES 0x08
197 #define IMA_APPRAISE_FIRMWARE 0x10
198 #define IMA_APPRAISE_POLICY 0x20
200 #ifdef CONFIG_IMA_APPRAISE
201 int ima_appraise_measurement(enum ima_hooks func
,
202 struct integrity_iint_cache
*iint
,
203 struct file
*file
, const unsigned char *filename
,
204 struct evm_ima_xattr_data
*xattr_value
,
205 int xattr_len
, int opened
);
206 int ima_must_appraise(struct inode
*inode
, int mask
, enum ima_hooks func
);
207 void ima_update_xattr(struct integrity_iint_cache
*iint
, struct file
*file
);
208 enum integrity_status
ima_get_cache_status(struct integrity_iint_cache
*iint
,
209 enum ima_hooks func
);
210 enum hash_algo
ima_get_hash_algo(struct evm_ima_xattr_data
*xattr_value
,
212 int ima_read_xattr(struct dentry
*dentry
,
213 struct evm_ima_xattr_data
**xattr_value
);
216 static inline int ima_appraise_measurement(enum ima_hooks func
,
217 struct integrity_iint_cache
*iint
,
219 const unsigned char *filename
,
220 struct evm_ima_xattr_data
*xattr_value
,
221 int xattr_len
, int opened
)
223 return INTEGRITY_UNKNOWN
;
226 static inline int ima_must_appraise(struct inode
*inode
, int mask
,
232 static inline void ima_update_xattr(struct integrity_iint_cache
*iint
,
237 static inline enum integrity_status
ima_get_cache_status(struct integrity_iint_cache
241 return INTEGRITY_UNKNOWN
;
244 static inline enum hash_algo
245 ima_get_hash_algo(struct evm_ima_xattr_data
*xattr_value
, int xattr_len
)
247 return ima_hash_algo
;
250 static inline int ima_read_xattr(struct dentry
*dentry
,
251 struct evm_ima_xattr_data
**xattr_value
)
258 /* LSM based policy rules require audit */
259 #ifdef CONFIG_IMA_LSM_RULES
261 #define security_filter_rule_init security_audit_rule_init
262 #define security_filter_rule_match security_audit_rule_match
266 static inline int security_filter_rule_init(u32 field
, u32 op
, char *rulestr
,
272 static inline int security_filter_rule_match(u32 secid
, u32 field
, u32 op
,
274 struct audit_context
*actx
)
278 #endif /* CONFIG_IMA_TRUSTED_KEYRING */
280 #ifdef CONFIG_IMA_READ_POLICY
281 #define POLICY_FILE_FLAGS (S_IWUSR | S_IRUSR)
283 #define POLICY_FILE_FLAGS S_IWUSR
284 #endif /* CONFIG_IMA_WRITE_POLICY */
286 #endif /* __LINUX_IMA_H */