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17#ifndef __LINUX_IMA_H
18#define __LINUX_IMA_H
19
20#include <linux/types.h>
21#include <linux/crypto.h>
22#include <linux/fs.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>
28
29#include "../integrity.h"
30
31#ifdef CONFIG_HAVE_IMA_KEXEC
32#include <asm/ima.h>
33#endif
34
35enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_BINARY_NO_FIELD_LEN,
36 IMA_SHOW_BINARY_OLD_STRING_FMT, IMA_SHOW_ASCII };
37enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 };
38
39
40#define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE
41#define IMA_EVENT_NAME_LEN_MAX 255
42
43#define IMA_HASH_BITS 9
44#define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
45
46#define IMA_TEMPLATE_FIELD_ID_MAX_LEN 16
47#define IMA_TEMPLATE_NUM_FIELDS_MAX 15
48
49#define IMA_TEMPLATE_IMA_NAME "ima"
50#define IMA_TEMPLATE_IMA_FMT "d|n"
51
52
53extern int ima_policy_flag;
54
55
56extern int ima_hash_algo;
57extern int ima_appraise;
58extern struct tpm_chip *ima_tpm_chip;
59
60
61struct ima_event_data {
62 struct integrity_iint_cache *iint;
63 struct file *file;
64 const unsigned char *filename;
65 struct evm_ima_xattr_data *xattr_value;
66 int xattr_len;
67 const char *violation;
68};
69
70
71struct ima_field_data {
72 u8 *data;
73 u32 len;
74};
75
76
77struct ima_template_field {
78 const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN];
79 int (*field_init)(struct ima_event_data *event_data,
80 struct ima_field_data *field_data);
81 void (*field_show)(struct seq_file *m, enum ima_show_type show,
82 struct ima_field_data *field_data);
83};
84
85
86struct ima_template_desc {
87 struct list_head list;
88 char *name;
89 char *fmt;
90 int num_fields;
91 const struct ima_template_field **fields;
92};
93
94struct ima_template_entry {
95 int pcr;
96 u8 digest[TPM_DIGEST_SIZE];
97 struct ima_template_desc *template_desc;
98 u32 template_data_len;
99 struct ima_field_data template_data[0];
100};
101
102struct ima_queue_entry {
103 struct hlist_node hnext;
104 struct list_head later;
105 struct ima_template_entry *entry;
106};
107extern struct list_head ima_measurements;
108
109
110struct ima_kexec_hdr {
111 u16 version;
112 u16 _reserved0;
113 u32 _reserved1;
114 u64 buffer_size;
115 u64 count;
116};
117
118#ifdef CONFIG_HAVE_IMA_KEXEC
119void ima_load_kexec_buffer(void);
120#else
121static inline void ima_load_kexec_buffer(void) {}
122#endif
123
124
125
126
127
128extern bool ima_canonical_fmt;
129
130
131int ima_init(void);
132int ima_fs_init(void);
133int ima_add_template_entry(struct ima_template_entry *entry, int violation,
134 const char *op, struct inode *inode,
135 const unsigned char *filename);
136int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
137int ima_calc_buffer_hash(const void *buf, loff_t len,
138 struct ima_digest_data *hash);
139int ima_calc_field_array_hash(struct ima_field_data *field_data,
140 struct ima_template_desc *desc, int num_fields,
141 struct ima_digest_data *hash);
142int __init ima_calc_boot_aggregate(struct ima_digest_data *hash);
143void ima_add_violation(struct file *file, const unsigned char *filename,
144 struct integrity_iint_cache *iint,
145 const char *op, const char *cause);
146int ima_init_crypto(void);
147void ima_putc(struct seq_file *m, void *data, int datalen);
148void ima_print_digest(struct seq_file *m, u8 *digest, u32 size);
149struct ima_template_desc *ima_template_desc_current(void);
150int ima_restore_measurement_entry(struct ima_template_entry *entry);
151int ima_restore_measurement_list(loff_t bufsize, void *buf);
152int ima_measurements_show(struct seq_file *m, void *v);
153unsigned long ima_get_binary_runtime_size(void);
154int ima_init_template(void);
155void ima_init_template_list(void);
156
157
158
159
160extern spinlock_t ima_queue_lock;
161
162struct ima_h_table {
163 atomic_long_t len;
164 atomic_long_t violations;
165 struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
166};
167extern struct ima_h_table ima_htable;
168
169static inline unsigned long ima_hash_key(u8 *digest)
170{
171 return hash_long(*digest, IMA_HASH_BITS);
172}
173
174#define __ima_hooks(hook) \
175 hook(NONE) \
176 hook(FILE_CHECK) \
177 hook(MMAP_CHECK) \
178 hook(BPRM_CHECK) \
179 hook(CREDS_CHECK) \
180 hook(POST_SETATTR) \
181 hook(MODULE_CHECK) \
182 hook(FIRMWARE_CHECK) \
183 hook(KEXEC_KERNEL_CHECK) \
184 hook(KEXEC_INITRAMFS_CHECK) \
185 hook(POLICY_CHECK) \
186 hook(MAX_CHECK)
187#define __ima_hook_enumify(ENUM) ENUM,
188
189enum ima_hooks {
190 __ima_hooks(__ima_hook_enumify)
191};
192
193
194int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid,
195 int mask, enum ima_hooks func, int *pcr);
196int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func);
197int ima_collect_measurement(struct integrity_iint_cache *iint,
198 struct file *file, void *buf, loff_t size,
199 enum hash_algo algo);
200void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
201 const unsigned char *filename,
202 struct evm_ima_xattr_data *xattr_value,
203 int xattr_len, int pcr);
204void ima_audit_measurement(struct integrity_iint_cache *iint,
205 const unsigned char *filename);
206int ima_alloc_init_template(struct ima_event_data *event_data,
207 struct ima_template_entry **entry);
208int ima_store_template(struct ima_template_entry *entry, int violation,
209 struct inode *inode,
210 const unsigned char *filename, int pcr);
211void ima_free_template_entry(struct ima_template_entry *entry);
212const char *ima_d_path(const struct path *path, char **pathbuf, char *filename);
213
214
215int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
216 enum ima_hooks func, int mask, int flags, int *pcr);
217void ima_init_policy(void);
218void ima_update_policy(void);
219void ima_update_policy_flag(void);
220ssize_t ima_parse_add_rule(char *);
221void ima_delete_rules(void);
222int ima_check_policy(void);
223void *ima_policy_start(struct seq_file *m, loff_t *pos);
224void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos);
225void ima_policy_stop(struct seq_file *m, void *v);
226int ima_policy_show(struct seq_file *m, void *v);
227
228
229#define IMA_APPRAISE_ENFORCE 0x01
230#define IMA_APPRAISE_FIX 0x02
231#define IMA_APPRAISE_LOG 0x04
232#define IMA_APPRAISE_MODULES 0x08
233#define IMA_APPRAISE_FIRMWARE 0x10
234#define IMA_APPRAISE_POLICY 0x20
235#define IMA_APPRAISE_KEXEC 0x40
236
237#ifdef CONFIG_IMA_APPRAISE
238int ima_appraise_measurement(enum ima_hooks func,
239 struct integrity_iint_cache *iint,
240 struct file *file, const unsigned char *filename,
241 struct evm_ima_xattr_data *xattr_value,
242 int xattr_len);
243int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func);
244void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
245enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
246 enum ima_hooks func);
247enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value,
248 int xattr_len);
249int ima_read_xattr(struct dentry *dentry,
250 struct evm_ima_xattr_data **xattr_value);
251
252#else
253static inline int ima_appraise_measurement(enum ima_hooks func,
254 struct integrity_iint_cache *iint,
255 struct file *file,
256 const unsigned char *filename,
257 struct evm_ima_xattr_data *xattr_value,
258 int xattr_len)
259{
260 return INTEGRITY_UNKNOWN;
261}
262
263static inline int ima_must_appraise(struct inode *inode, int mask,
264 enum ima_hooks func)
265{
266 return 0;
267}
268
269static inline void ima_update_xattr(struct integrity_iint_cache *iint,
270 struct file *file)
271{
272}
273
274static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
275 *iint,
276 enum ima_hooks func)
277{
278 return INTEGRITY_UNKNOWN;
279}
280
281static inline enum hash_algo
282ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len)
283{
284 return ima_hash_algo;
285}
286
287static inline int ima_read_xattr(struct dentry *dentry,
288 struct evm_ima_xattr_data **xattr_value)
289{
290 return 0;
291}
292
293#endif
294
295
296#ifdef CONFIG_IMA_LSM_RULES
297
298#define security_filter_rule_init security_audit_rule_init
299#define security_filter_rule_match security_audit_rule_match
300
301#else
302
303static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
304 void **lsmrule)
305{
306 return -EINVAL;
307}
308
309static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
310 void *lsmrule,
311 struct audit_context *actx)
312{
313 return -EINVAL;
314}
315#endif
316
317#ifdef CONFIG_IMA_READ_POLICY
318#define POLICY_FILE_FLAGS (S_IWUSR | S_IRUSR)
319#else
320#define POLICY_FILE_FLAGS S_IWUSR
321#endif
322
323#endif
324