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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_initialized;
57extern int ima_used_chip;
58extern int ima_hash_algo;
59extern int ima_appraise;
60
61
62struct ima_event_data {
63 struct integrity_iint_cache *iint;
64 struct file *file;
65 const unsigned char *filename;
66 struct evm_ima_xattr_data *xattr_value;
67 int xattr_len;
68 const char *violation;
69};
70
71
72struct ima_field_data {
73 u8 *data;
74 u32 len;
75};
76
77
78struct 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);
84};
85
86
87struct ima_template_desc {
88 struct list_head list;
89 char *name;
90 char *fmt;
91 int num_fields;
92 struct ima_template_field **fields;
93};
94
95struct ima_template_entry {
96 int pcr;
97 u8 digest[TPM_DIGEST_SIZE];
98 struct ima_template_desc *template_desc;
99 u32 template_data_len;
100 struct ima_field_data template_data[0];
101};
102
103struct ima_queue_entry {
104 struct hlist_node hnext;
105 struct list_head later;
106 struct ima_template_entry *entry;
107};
108extern struct list_head ima_measurements;
109
110
111struct ima_kexec_hdr {
112 u16 version;
113 u16 _reserved0;
114 u32 _reserved1;
115 u64 buffer_size;
116 u64 count;
117};
118
119#ifdef CONFIG_HAVE_IMA_KEXEC
120void ima_load_kexec_buffer(void);
121#else
122static inline void ima_load_kexec_buffer(void) {}
123#endif
124
125
126
127
128
129extern bool ima_canonical_fmt;
130
131
132int ima_init(void);
133int ima_fs_init(void);
134int ima_add_template_entry(struct ima_template_entry *entry, int violation,
135 const char *op, struct inode *inode,
136 const unsigned char *filename);
137int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
138int ima_calc_buffer_hash(const void *buf, loff_t len,
139 struct ima_digest_data *hash);
140int 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);
143int __init ima_calc_boot_aggregate(struct ima_digest_data *hash);
144void ima_add_violation(struct file *file, const unsigned char *filename,
145 struct integrity_iint_cache *iint,
146 const char *op, const char *cause);
147int ima_init_crypto(void);
148void ima_putc(struct seq_file *m, void *data, int datalen);
149void ima_print_digest(struct seq_file *m, u8 *digest, u32 size);
150struct ima_template_desc *ima_template_desc_current(void);
151int ima_restore_measurement_entry(struct ima_template_entry *entry);
152int ima_restore_measurement_list(loff_t bufsize, void *buf);
153int ima_measurements_show(struct seq_file *m, void *v);
154unsigned long ima_get_binary_runtime_size(void);
155int ima_init_template(void);
156void ima_init_template_list(void);
157
158
159
160
161extern spinlock_t ima_queue_lock;
162
163struct ima_h_table {
164 atomic_long_t len;
165 atomic_long_t violations;
166 struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
167};
168extern struct ima_h_table ima_htable;
169
170static inline unsigned long ima_hash_key(u8 *digest)
171{
172 return hash_long(*digest, IMA_HASH_BITS);
173}
174
175#define __ima_hooks(hook) \
176 hook(NONE) \
177 hook(FILE_CHECK) \
178 hook(MMAP_CHECK) \
179 hook(BPRM_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, int mask,
195 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, enum ima_hooks func, int mask,
216 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
236#ifdef CONFIG_IMA_APPRAISE
237int ima_appraise_measurement(enum ima_hooks func,
238 struct integrity_iint_cache *iint,
239 struct file *file, const unsigned char *filename,
240 struct evm_ima_xattr_data *xattr_value,
241 int xattr_len, int opened);
242int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func);
243void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
244enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
245 enum ima_hooks func);
246enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value,
247 int xattr_len);
248int ima_read_xattr(struct dentry *dentry,
249 struct evm_ima_xattr_data **xattr_value);
250
251#else
252static inline int ima_appraise_measurement(enum ima_hooks func,
253 struct integrity_iint_cache *iint,
254 struct file *file,
255 const unsigned char *filename,
256 struct evm_ima_xattr_data *xattr_value,
257 int xattr_len, int opened)
258{
259 return INTEGRITY_UNKNOWN;
260}
261
262static inline int ima_must_appraise(struct inode *inode, int mask,
263 enum ima_hooks func)
264{
265 return 0;
266}
267
268static inline void ima_update_xattr(struct integrity_iint_cache *iint,
269 struct file *file)
270{
271}
272
273static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
274 *iint,
275 enum ima_hooks func)
276{
277 return INTEGRITY_UNKNOWN;
278}
279
280static inline enum hash_algo
281ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len)
282{
283 return ima_hash_algo;
284}
285
286static inline int ima_read_xattr(struct dentry *dentry,
287 struct evm_ima_xattr_data **xattr_value)
288{
289 return 0;
290}
291
292#endif
293
294
295#ifdef CONFIG_IMA_LSM_RULES
296
297#define security_filter_rule_init security_audit_rule_init
298#define security_filter_rule_match security_audit_rule_match
299
300#else
301
302static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
303 void **lsmrule)
304{
305 return -EINVAL;
306}
307
308static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
309 void *lsmrule,
310 struct audit_context *actx)
311{
312 return -EINVAL;
313}
314#endif
315
316#ifdef CONFIG_IMA_READ_POLICY
317#define POLICY_FILE_FLAGS (S_IWUSR | S_IRUSR)
318#else
319#define POLICY_FILE_FLAGS S_IWUSR
320#endif
321
322#endif
323