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 10
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 int ima_hash_key(u8 *digest)
141 /* there is no point in taking a hash of part of a digest */
142 return (digest[0] | digest[1] << 8) % IMA_MEASURE_HTABLE_SIZE;
153 KEXEC_INITRAMFS_CHECK,
158 /* LIM API function definitions */
159 int ima_get_action(struct inode *inode, int mask,
160 enum ima_hooks func, int *pcr);
161 int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func);
162 int ima_collect_measurement(struct integrity_iint_cache *iint,
163 struct file *file, void *buf, loff_t size,
164 enum hash_algo algo);
165 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
166 const unsigned char *filename,
167 struct evm_ima_xattr_data *xattr_value,
168 int xattr_len, int pcr);
169 void ima_audit_measurement(struct integrity_iint_cache *iint,
170 const unsigned char *filename);
171 int ima_alloc_init_template(struct ima_event_data *event_data,
172 struct ima_template_entry **entry);
173 int ima_store_template(struct ima_template_entry *entry, int violation,
175 const unsigned char *filename, int pcr);
176 void ima_free_template_entry(struct ima_template_entry *entry);
177 const char *ima_d_path(const struct path *path, char **pathbuf, char *filename);
179 /* IMA policy related functions */
180 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask,
181 int flags, int *pcr);
182 void ima_init_policy(void);
183 void ima_update_policy(void);
184 void ima_update_policy_flag(void);
185 ssize_t ima_parse_add_rule(char *);
186 void ima_delete_rules(void);
187 int ima_check_policy(void);
188 void *ima_policy_start(struct seq_file *m, loff_t *pos);
189 void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos);
190 void ima_policy_stop(struct seq_file *m, void *v);
191 int ima_policy_show(struct seq_file *m, void *v);
193 /* Appraise integrity measurements */
194 #define IMA_APPRAISE_ENFORCE 0x01
195 #define IMA_APPRAISE_FIX 0x02
196 #define IMA_APPRAISE_LOG 0x04
197 #define IMA_APPRAISE_MODULES 0x08
198 #define IMA_APPRAISE_FIRMWARE 0x10
199 #define IMA_APPRAISE_POLICY 0x20
201 #ifdef CONFIG_IMA_APPRAISE
202 int ima_appraise_measurement(enum ima_hooks func,
203 struct integrity_iint_cache *iint,
204 struct file *file, const unsigned char *filename,
205 struct evm_ima_xattr_data *xattr_value,
206 int xattr_len, int opened);
207 int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func);
208 void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
209 enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
210 enum ima_hooks func);
211 enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value,
213 int ima_read_xattr(struct dentry *dentry,
214 struct evm_ima_xattr_data **xattr_value);
217 static inline int ima_appraise_measurement(enum ima_hooks func,
218 struct integrity_iint_cache *iint,
220 const unsigned char *filename,
221 struct evm_ima_xattr_data *xattr_value,
222 int xattr_len, int opened)
224 return INTEGRITY_UNKNOWN;
227 static inline int ima_must_appraise(struct inode *inode, int mask,
233 static inline void ima_update_xattr(struct integrity_iint_cache *iint,
238 static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
242 return INTEGRITY_UNKNOWN;
245 static inline enum hash_algo
246 ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len)
248 return ima_hash_algo;
251 static inline int ima_read_xattr(struct dentry *dentry,
252 struct evm_ima_xattr_data **xattr_value)
259 /* LSM based policy rules require audit */
260 #ifdef CONFIG_IMA_LSM_RULES
262 #define security_filter_rule_init security_audit_rule_init
263 #define security_filter_rule_match security_audit_rule_match
267 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
273 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
275 struct audit_context *actx)
279 #endif /* CONFIG_IMA_TRUSTED_KEYRING */
281 #ifdef CONFIG_IMA_READ_POLICY
282 #define POLICY_FILE_FLAGS (S_IWUSR | S_IRUSR)
284 #define POLICY_FILE_FLAGS S_IWUSR
285 #endif /* CONFIG_IMA_WRITE_POLICY */
287 #endif /* __LINUX_IMA_H */