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 #ifdef CONFIG_HAVE_IMA_KEXEC
35 enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_BINARY_NO_FIELD_LEN,
36 IMA_SHOW_BINARY_OLD_STRING_FMT, IMA_SHOW_ASCII };
37 enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 };
39 /* digest size for IMA, fits SHA1 or MD5 */
40 #define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE
41 #define IMA_EVENT_NAME_LEN_MAX 255
43 #define IMA_HASH_BITS 10
44 #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
46 #define IMA_TEMPLATE_FIELD_ID_MAX_LEN 16
47 #define IMA_TEMPLATE_NUM_FIELDS_MAX 15
49 #define IMA_TEMPLATE_IMA_NAME "ima"
50 #define IMA_TEMPLATE_IMA_FMT "d|n"
52 /* current content of the policy */
53 extern int ima_policy_flag;
55 /* set during initialization */
56 extern int ima_hash_algo;
57 extern int ima_appraise;
58 extern struct tpm_chip *ima_tpm_chip;
59 extern const char boot_aggregate_name[];
61 /* IMA event related data */
62 struct ima_event_data {
63 struct integrity_iint_cache *iint;
65 const unsigned char *filename;
66 struct evm_ima_xattr_data *xattr_value;
68 const char *violation;
71 /* IMA template field data definition */
72 struct ima_field_data {
77 /* IMA template field definition */
78 struct ima_template_field {
79 const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN];
80 int (*field_init)(struct ima_event_data *event_data,
81 struct ima_field_data *field_data);
82 void (*field_show)(struct seq_file *m, enum ima_show_type show,
83 struct ima_field_data *field_data);
86 /* IMA template descriptor definition */
87 struct ima_template_desc {
88 struct list_head list;
92 struct ima_template_field **fields;
95 struct ima_template_entry {
97 u8 digest[TPM_DIGEST_SIZE]; /* sha1 or md5 measurement hash */
98 struct ima_template_desc *template_desc; /* template descriptor */
99 u32 template_data_len;
100 struct ima_field_data template_data[0]; /* template related data */
103 struct ima_queue_entry {
104 struct hlist_node hnext; /* place in hash collision list */
105 struct list_head later; /* place in ima_measurements list */
106 struct ima_template_entry *entry;
108 extern struct list_head ima_measurements; /* list of all measurements */
110 /* Some details preceding the binary serialized measurement list */
111 struct ima_kexec_hdr {
119 #ifdef CONFIG_HAVE_IMA_KEXEC
120 void ima_load_kexec_buffer(void);
122 static inline void ima_load_kexec_buffer(void) {}
123 #endif /* CONFIG_HAVE_IMA_KEXEC */
126 * The default binary_runtime_measurements list format is defined as the
127 * platform native format. The canonical format is defined as little-endian.
129 extern bool ima_canonical_fmt;
131 /* Internal IMA function definitions */
133 int ima_fs_init(void);
134 int ima_add_template_entry(struct ima_template_entry *entry, int violation,
135 const char *op, struct inode *inode,
136 const unsigned char *filename);
137 int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
138 int ima_calc_buffer_hash(const void *buf, loff_t len,
139 struct ima_digest_data *hash);
140 int ima_calc_field_array_hash(struct ima_field_data *field_data,
141 struct ima_template_desc *desc, int num_fields,
142 struct ima_digest_data *hash);
143 int ima_calc_boot_aggregate(struct ima_digest_data *hash);
144 void ima_add_violation(struct file *file, const unsigned char *filename,
145 struct integrity_iint_cache *iint,
146 const char *op, const char *cause);
147 int ima_init_crypto(void);
148 void ima_putc(struct seq_file *m, void *data, int datalen);
149 void ima_print_digest(struct seq_file *m, u8 *digest, u32 size);
150 struct ima_template_desc *ima_template_desc_current(void);
151 int ima_restore_measurement_entry(struct ima_template_entry *entry);
152 int ima_restore_measurement_list(loff_t bufsize, void *buf);
153 int ima_measurements_show(struct seq_file *m, void *v);
154 unsigned long ima_get_binary_runtime_size(void);
155 int ima_init_template(void);
156 void ima_init_template_list(void);
159 * used to protect h_table and sha_table
161 extern spinlock_t ima_queue_lock;
164 atomic_long_t len; /* number of stored measurements in the list */
165 atomic_long_t violations;
166 struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
168 extern struct ima_h_table ima_htable;
170 static inline unsigned int ima_hash_key(u8 *digest)
172 /* there is no point in taking a hash of part of a digest */
173 return (digest[0] | digest[1] << 8) % IMA_MEASURE_HTABLE_SIZE;
176 #define __ima_hooks(hook) \
184 hook(FIRMWARE_CHECK) \
185 hook(KEXEC_KERNEL_CHECK) \
186 hook(KEXEC_INITRAMFS_CHECK) \
189 #define __ima_hook_enumify(ENUM) ENUM,
192 __ima_hooks(__ima_hook_enumify)
195 /* LIM API function definitions */
196 int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid,
197 int mask, enum ima_hooks func, int *pcr);
198 int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func);
199 int ima_collect_measurement(struct integrity_iint_cache *iint,
200 struct file *file, void *buf, loff_t size,
201 enum hash_algo algo);
202 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
203 const unsigned char *filename,
204 struct evm_ima_xattr_data *xattr_value,
205 int xattr_len, int pcr);
206 void ima_audit_measurement(struct integrity_iint_cache *iint,
207 const unsigned char *filename);
208 int ima_alloc_init_template(struct ima_event_data *event_data,
209 struct ima_template_entry **entry);
210 int ima_store_template(struct ima_template_entry *entry, int violation,
212 const unsigned char *filename, int pcr);
213 void ima_free_template_entry(struct ima_template_entry *entry);
214 const char *ima_d_path(const struct path *path, char **pathbuf, char *filename);
216 /* IMA policy related functions */
217 int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
218 enum ima_hooks func, int mask, int flags, int *pcr);
219 void ima_init_policy(void);
220 void ima_update_policy(void);
221 void ima_update_policy_flag(void);
222 ssize_t ima_parse_add_rule(char *);
223 void ima_delete_rules(void);
224 int ima_check_policy(void);
225 void *ima_policy_start(struct seq_file *m, loff_t *pos);
226 void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos);
227 void ima_policy_stop(struct seq_file *m, void *v);
228 int ima_policy_show(struct seq_file *m, void *v);
230 /* Appraise integrity measurements */
231 #define IMA_APPRAISE_ENFORCE 0x01
232 #define IMA_APPRAISE_FIX 0x02
233 #define IMA_APPRAISE_LOG 0x04
234 #define IMA_APPRAISE_MODULES 0x08
235 #define IMA_APPRAISE_FIRMWARE 0x10
236 #define IMA_APPRAISE_POLICY 0x20
237 #define IMA_APPRAISE_KEXEC 0x40
239 #ifdef CONFIG_IMA_APPRAISE
240 int ima_appraise_measurement(enum ima_hooks func,
241 struct integrity_iint_cache *iint,
242 struct file *file, const unsigned char *filename,
243 struct evm_ima_xattr_data *xattr_value,
245 int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func);
246 void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
247 enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
248 enum ima_hooks func);
249 enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value,
251 int ima_read_xattr(struct dentry *dentry,
252 struct evm_ima_xattr_data **xattr_value);
255 static inline int ima_appraise_measurement(enum ima_hooks func,
256 struct integrity_iint_cache *iint,
258 const unsigned char *filename,
259 struct evm_ima_xattr_data *xattr_value,
262 return INTEGRITY_UNKNOWN;
265 static inline int ima_must_appraise(struct inode *inode, int mask,
271 static inline void ima_update_xattr(struct integrity_iint_cache *iint,
276 static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
280 return INTEGRITY_UNKNOWN;
283 static inline enum hash_algo
284 ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len)
286 return ima_hash_algo;
289 static inline int ima_read_xattr(struct dentry *dentry,
290 struct evm_ima_xattr_data **xattr_value)
295 #endif /* CONFIG_IMA_APPRAISE */
297 /* LSM based policy rules require audit */
298 #ifdef CONFIG_IMA_LSM_RULES
300 #define security_filter_rule_init security_audit_rule_init
301 #define security_filter_rule_match security_audit_rule_match
305 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
311 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
313 struct audit_context *actx)
317 #endif /* CONFIG_IMA_LSM_RULES */
319 #ifdef CONFIG_IMA_READ_POLICY
320 #define POLICY_FILE_FLAGS (S_IWUSR | S_IRUSR)
322 #define POLICY_FILE_FLAGS S_IWUSR
323 #endif /* CONFIG_IMA_READ_POLICY */
325 #endif /* __LINUX_IMA_H */