1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2005,2006,2007,2008 IBM Corporation
6 * Reiner Sailer <sailer@watson.ibm.com>
7 * Mimi Zohar <zohar@us.ibm.com>
10 * internal Integrity Measurement Architecture (IMA) definitions
16 #include <linux/types.h>
17 #include <linux/crypto.h>
19 #include <linux/security.h>
20 #include <linux/hash.h>
21 #include <linux/tpm.h>
22 #include <linux/audit.h>
23 #include <crypto/hash_info.h>
25 #include "../integrity.h"
27 #ifdef CONFIG_HAVE_IMA_KEXEC
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_hash_algo;
53 extern int ima_appraise;
54 extern struct tpm_chip *ima_tpm_chip;
56 /* IMA event related data */
57 struct ima_event_data {
58 struct integrity_iint_cache *iint;
60 const unsigned char *filename;
61 struct evm_ima_xattr_data *xattr_value;
63 const struct modsig *modsig;
64 const char *violation;
69 /* IMA template field data definition */
70 struct ima_field_data {
75 /* IMA template field definition */
76 struct ima_template_field {
77 const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN];
78 int (*field_init)(struct ima_event_data *event_data,
79 struct ima_field_data *field_data);
80 void (*field_show)(struct seq_file *m, enum ima_show_type show,
81 struct ima_field_data *field_data);
84 /* IMA template descriptor definition */
85 struct ima_template_desc {
86 struct list_head list;
90 const struct ima_template_field **fields;
93 struct ima_template_entry {
95 u8 digest[TPM_DIGEST_SIZE]; /* sha1 or md5 measurement hash */
96 struct ima_template_desc *template_desc; /* template descriptor */
97 u32 template_data_len;
98 struct ima_field_data template_data[0]; /* template related data */
101 struct ima_queue_entry {
102 struct hlist_node hnext; /* place in hash collision list */
103 struct list_head later; /* place in ima_measurements list */
104 struct ima_template_entry *entry;
106 extern struct list_head ima_measurements; /* list of all measurements */
108 /* Some details preceding the binary serialized measurement list */
109 struct ima_kexec_hdr {
117 #ifdef CONFIG_HAVE_IMA_KEXEC
118 void ima_load_kexec_buffer(void);
120 static inline void ima_load_kexec_buffer(void) {}
121 #endif /* CONFIG_HAVE_IMA_KEXEC */
124 * The default binary_runtime_measurements list format is defined as the
125 * platform native format. The canonical format is defined as little-endian.
127 extern bool ima_canonical_fmt;
129 /* Internal IMA function definitions */
131 int ima_fs_init(void);
132 int ima_add_template_entry(struct ima_template_entry *entry, int violation,
133 const char *op, struct inode *inode,
134 const unsigned char *filename);
135 int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
136 int ima_calc_buffer_hash(const void *buf, loff_t len,
137 struct ima_digest_data *hash);
138 int ima_calc_field_array_hash(struct ima_field_data *field_data,
139 struct ima_template_desc *desc, int num_fields,
140 struct ima_digest_data *hash);
141 int __init ima_calc_boot_aggregate(struct ima_digest_data *hash);
142 void ima_add_violation(struct file *file, const unsigned char *filename,
143 struct integrity_iint_cache *iint,
144 const char *op, const char *cause);
145 int ima_init_crypto(void);
146 void ima_putc(struct seq_file *m, void *data, int datalen);
147 void ima_print_digest(struct seq_file *m, u8 *digest, u32 size);
148 int template_desc_init_fields(const char *template_fmt,
149 const struct ima_template_field ***fields,
151 struct ima_template_desc *ima_template_desc_current(void);
152 struct ima_template_desc *lookup_template_desc(const char *name);
153 bool ima_template_has_modsig(const struct ima_template_desc *ima_template);
154 int ima_restore_measurement_entry(struct ima_template_entry *entry);
155 int ima_restore_measurement_list(loff_t bufsize, void *buf);
156 int ima_measurements_show(struct seq_file *m, void *v);
157 unsigned long ima_get_binary_runtime_size(void);
158 int ima_init_template(void);
159 void ima_init_template_list(void);
160 int __init ima_init_digests(void);
161 int ima_lsm_policy_change(struct notifier_block *nb, unsigned long event,
165 * used to protect h_table and sha_table
167 extern spinlock_t ima_queue_lock;
170 atomic_long_t len; /* number of stored measurements in the list */
171 atomic_long_t violations;
172 struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
174 extern struct ima_h_table ima_htable;
176 static inline unsigned long ima_hash_key(u8 *digest)
178 return hash_long(*digest, IMA_HASH_BITS);
181 #define __ima_hooks(hook) \
189 hook(FIRMWARE_CHECK) \
190 hook(KEXEC_KERNEL_CHECK) \
191 hook(KEXEC_INITRAMFS_CHECK) \
193 hook(KEXEC_CMDLINE) \
195 #define __ima_hook_enumify(ENUM) ENUM,
198 __ima_hooks(__ima_hook_enumify)
201 extern const char *const func_tokens[];
205 /* LIM API function definitions */
206 int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid,
207 int mask, enum ima_hooks func, int *pcr,
208 struct ima_template_desc **template_desc);
209 int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func);
210 int ima_collect_measurement(struct integrity_iint_cache *iint,
211 struct file *file, void *buf, loff_t size,
212 enum hash_algo algo, struct modsig *modsig);
213 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
214 const unsigned char *filename,
215 struct evm_ima_xattr_data *xattr_value,
216 int xattr_len, const struct modsig *modsig, int pcr,
217 struct ima_template_desc *template_desc);
218 void ima_audit_measurement(struct integrity_iint_cache *iint,
219 const unsigned char *filename);
220 int ima_alloc_init_template(struct ima_event_data *event_data,
221 struct ima_template_entry **entry,
222 struct ima_template_desc *template_desc);
223 int ima_store_template(struct ima_template_entry *entry, int violation,
225 const unsigned char *filename, int pcr);
226 void ima_free_template_entry(struct ima_template_entry *entry);
227 const char *ima_d_path(const struct path *path, char **pathbuf, char *filename);
229 /* IMA policy related functions */
230 int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
231 enum ima_hooks func, int mask, int flags, int *pcr,
232 struct ima_template_desc **template_desc);
233 void ima_init_policy(void);
234 void ima_update_policy(void);
235 void ima_update_policy_flag(void);
236 ssize_t ima_parse_add_rule(char *);
237 void ima_delete_rules(void);
238 int ima_check_policy(void);
239 void *ima_policy_start(struct seq_file *m, loff_t *pos);
240 void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos);
241 void ima_policy_stop(struct seq_file *m, void *v);
242 int ima_policy_show(struct seq_file *m, void *v);
244 /* Appraise integrity measurements */
245 #define IMA_APPRAISE_ENFORCE 0x01
246 #define IMA_APPRAISE_FIX 0x02
247 #define IMA_APPRAISE_LOG 0x04
248 #define IMA_APPRAISE_MODULES 0x08
249 #define IMA_APPRAISE_FIRMWARE 0x10
250 #define IMA_APPRAISE_POLICY 0x20
251 #define IMA_APPRAISE_KEXEC 0x40
253 #ifdef CONFIG_IMA_APPRAISE
254 int ima_appraise_measurement(enum ima_hooks func,
255 struct integrity_iint_cache *iint,
256 struct file *file, const unsigned char *filename,
257 struct evm_ima_xattr_data *xattr_value,
258 int xattr_len, const struct modsig *modsig);
259 int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func);
260 void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
261 enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
262 enum ima_hooks func);
263 enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value,
265 int ima_read_xattr(struct dentry *dentry,
266 struct evm_ima_xattr_data **xattr_value);
269 static inline int ima_appraise_measurement(enum ima_hooks func,
270 struct integrity_iint_cache *iint,
272 const unsigned char *filename,
273 struct evm_ima_xattr_data *xattr_value,
275 const struct modsig *modsig)
277 return INTEGRITY_UNKNOWN;
280 static inline int ima_must_appraise(struct inode *inode, int mask,
286 static inline void ima_update_xattr(struct integrity_iint_cache *iint,
291 static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
295 return INTEGRITY_UNKNOWN;
298 static inline enum hash_algo
299 ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len)
301 return ima_hash_algo;
304 static inline int ima_read_xattr(struct dentry *dentry,
305 struct evm_ima_xattr_data **xattr_value)
310 #endif /* CONFIG_IMA_APPRAISE */
312 #ifdef CONFIG_IMA_APPRAISE_MODSIG
313 bool ima_hook_supports_modsig(enum ima_hooks func);
314 int ima_read_modsig(enum ima_hooks func, const void *buf, loff_t buf_len,
315 struct modsig **modsig);
316 void ima_collect_modsig(struct modsig *modsig, const void *buf, loff_t size);
317 int ima_get_modsig_digest(const struct modsig *modsig, enum hash_algo *algo,
318 const u8 **digest, u32 *digest_size);
319 int ima_get_raw_modsig(const struct modsig *modsig, const void **data,
321 void ima_free_modsig(struct modsig *modsig);
323 static inline bool ima_hook_supports_modsig(enum ima_hooks func)
328 static inline int ima_read_modsig(enum ima_hooks func, const void *buf,
329 loff_t buf_len, struct modsig **modsig)
334 static inline void ima_collect_modsig(struct modsig *modsig, const void *buf,
339 static inline int ima_get_modsig_digest(const struct modsig *modsig,
340 enum hash_algo *algo, const u8 **digest,
346 static inline int ima_get_raw_modsig(const struct modsig *modsig,
347 const void **data, u32 *data_len)
352 static inline void ima_free_modsig(struct modsig *modsig)
355 #endif /* CONFIG_IMA_APPRAISE_MODSIG */
357 /* LSM based policy rules require audit */
358 #ifdef CONFIG_IMA_LSM_RULES
360 #define security_filter_rule_init security_audit_rule_init
361 #define security_filter_rule_match security_audit_rule_match
365 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
371 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
376 #endif /* CONFIG_IMA_LSM_RULES */
378 #ifdef CONFIG_IMA_READ_POLICY
379 #define POLICY_FILE_FLAGS (S_IWUSR | S_IRUSR)
381 #define POLICY_FILE_FLAGS S_IWUSR
382 #endif /* CONFIG_IMA_READ_POLICY */
384 #endif /* __LINUX_IMA_H */