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13#ifndef __LINUX_IMA_H
14#define __LINUX_IMA_H
15
16#include <linux/types.h>
17#include <linux/crypto.h>
18#include <linux/fs.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>
24
25#include "../integrity.h"
26
27enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_BINARY_NO_FIELD_LEN,
28 IMA_SHOW_BINARY_OLD_STRING_FMT, IMA_SHOW_ASCII };
29enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8, TPM_PCR10 = 10 };
30
31
32#define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE
33#define IMA_EVENT_NAME_LEN_MAX 255
34
35#define IMA_HASH_BITS 10
36#define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
37
38#define IMA_TEMPLATE_FIELD_ID_MAX_LEN 16
39#define IMA_TEMPLATE_NUM_FIELDS_MAX 15
40
41#define IMA_TEMPLATE_IMA_NAME "ima"
42#define IMA_TEMPLATE_IMA_FMT "d|n"
43
44#define NR_BANKS(chip) ((chip != NULL) ? chip->nr_allocated_banks : 0)
45
46
47extern int ima_policy_flag;
48
49
50extern atomic_t ima_setxattr_allowed_hash_algorithms;
51
52
53extern int ima_hash_algo __ro_after_init;
54extern int ima_sha1_idx __ro_after_init;
55extern int ima_hash_algo_idx __ro_after_init;
56extern int ima_extra_slots __ro_after_init;
57extern int ima_appraise;
58extern struct tpm_chip *ima_tpm_chip;
59extern const char boot_aggregate_name[];
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 struct modsig *modsig;
69 const char *violation;
70 const void *buf;
71 int buf_len;
72};
73
74
75struct ima_field_data {
76 u8 *data;
77 u32 len;
78};
79
80
81struct ima_template_field {
82 const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN];
83 int (*field_init)(struct ima_event_data *event_data,
84 struct ima_field_data *field_data);
85 void (*field_show)(struct seq_file *m, enum ima_show_type show,
86 struct ima_field_data *field_data);
87};
88
89
90struct ima_template_desc {
91 struct list_head list;
92 char *name;
93 char *fmt;
94 int num_fields;
95 const struct ima_template_field **fields;
96};
97
98struct ima_template_entry {
99 int pcr;
100 struct tpm_digest *digests;
101 struct ima_template_desc *template_desc;
102 u32 template_data_len;
103 struct ima_field_data template_data[];
104};
105
106struct ima_queue_entry {
107 struct hlist_node hnext;
108 struct list_head later;
109 struct ima_template_entry *entry;
110};
111extern struct list_head ima_measurements;
112
113
114struct ima_kexec_hdr {
115 u16 version;
116 u16 _reserved0;
117 u32 _reserved1;
118 u64 buffer_size;
119 u64 count;
120};
121
122extern const int read_idmap[];
123
124#ifdef CONFIG_HAVE_IMA_KEXEC
125void ima_load_kexec_buffer(void);
126#else
127static inline void ima_load_kexec_buffer(void) {}
128#endif
129
130
131
132
133
134extern bool ima_canonical_fmt;
135
136
137int ima_init(void);
138int ima_fs_init(void);
139int ima_add_template_entry(struct ima_template_entry *entry, int violation,
140 const char *op, struct inode *inode,
141 const unsigned char *filename);
142int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
143int ima_calc_buffer_hash(const void *buf, loff_t len,
144 struct ima_digest_data *hash);
145int ima_calc_field_array_hash(struct ima_field_data *field_data,
146 struct ima_template_entry *entry);
147int ima_calc_boot_aggregate(struct ima_digest_data *hash);
148void ima_add_violation(struct file *file, const unsigned char *filename,
149 struct integrity_iint_cache *iint,
150 const char *op, const char *cause);
151int ima_init_crypto(void);
152void ima_putc(struct seq_file *m, void *data, int datalen);
153void ima_print_digest(struct seq_file *m, u8 *digest, u32 size);
154int template_desc_init_fields(const char *template_fmt,
155 const struct ima_template_field ***fields,
156 int *num_fields);
157struct ima_template_desc *ima_template_desc_current(void);
158struct ima_template_desc *ima_template_desc_buf(void);
159struct ima_template_desc *lookup_template_desc(const char *name);
160bool ima_template_has_modsig(const struct ima_template_desc *ima_template);
161int ima_restore_measurement_entry(struct ima_template_entry *entry);
162int ima_restore_measurement_list(loff_t bufsize, void *buf);
163int ima_measurements_show(struct seq_file *m, void *v);
164unsigned long ima_get_binary_runtime_size(void);
165int ima_init_template(void);
166void ima_init_template_list(void);
167int __init ima_init_digests(void);
168int ima_lsm_policy_change(struct notifier_block *nb, unsigned long event,
169 void *lsm_data);
170
171
172
173
174extern spinlock_t ima_queue_lock;
175
176struct ima_h_table {
177 atomic_long_t len;
178 atomic_long_t violations;
179 struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
180};
181extern struct ima_h_table ima_htable;
182
183static inline unsigned int ima_hash_key(u8 *digest)
184{
185
186 return (digest[0] | digest[1] << 8) % IMA_MEASURE_HTABLE_SIZE;
187}
188
189#define __ima_hooks(hook) \
190 hook(NONE, none) \
191 hook(FILE_CHECK, file) \
192 hook(MMAP_CHECK, mmap) \
193 hook(BPRM_CHECK, bprm) \
194 hook(CREDS_CHECK, creds) \
195 hook(POST_SETATTR, post_setattr) \
196 hook(MODULE_CHECK, module) \
197 hook(FIRMWARE_CHECK, firmware) \
198 hook(KEXEC_KERNEL_CHECK, kexec_kernel) \
199 hook(KEXEC_INITRAMFS_CHECK, kexec_initramfs) \
200 hook(POLICY_CHECK, policy) \
201 hook(KEXEC_CMDLINE, kexec_cmdline) \
202 hook(KEY_CHECK, key) \
203 hook(CRITICAL_DATA, critical_data) \
204 hook(SETXATTR_CHECK, setxattr_check) \
205 hook(MAX_CHECK, none)
206
207#define __ima_hook_enumify(ENUM, str) ENUM,
208#define __ima_stringify(arg) (#arg)
209#define __ima_hook_measuring_stringify(ENUM, str) \
210 (__ima_stringify(measuring_ ##str)),
211
212enum ima_hooks {
213 __ima_hooks(__ima_hook_enumify)
214};
215
216static const char * const ima_hooks_measure_str[] = {
217 __ima_hooks(__ima_hook_measuring_stringify)
218};
219
220static inline const char *func_measure_str(enum ima_hooks func)
221{
222 if (func >= MAX_CHECK)
223 return ima_hooks_measure_str[NONE];
224
225 return ima_hooks_measure_str[func];
226}
227
228extern const char *const func_tokens[];
229
230struct modsig;
231
232#ifdef CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS
233
234
235
236struct ima_key_entry {
237 struct list_head list;
238 void *payload;
239 size_t payload_len;
240 char *keyring_name;
241};
242void ima_init_key_queue(void);
243bool ima_should_queue_key(void);
244bool ima_queue_key(struct key *keyring, const void *payload,
245 size_t payload_len);
246void ima_process_queued_keys(void);
247#else
248static inline void ima_init_key_queue(void) {}
249static inline bool ima_should_queue_key(void) { return false; }
250static inline bool ima_queue_key(struct key *keyring,
251 const void *payload,
252 size_t payload_len) { return false; }
253static inline void ima_process_queued_keys(void) {}
254#endif
255
256
257int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode,
258 const struct cred *cred, u32 secid, int mask,
259 enum ima_hooks func, int *pcr,
260 struct ima_template_desc **template_desc,
261 const char *func_data, unsigned int *allowed_algos);
262int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func);
263int ima_collect_measurement(struct integrity_iint_cache *iint,
264 struct file *file, void *buf, loff_t size,
265 enum hash_algo algo, struct modsig *modsig);
266void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
267 const unsigned char *filename,
268 struct evm_ima_xattr_data *xattr_value,
269 int xattr_len, const struct modsig *modsig, int pcr,
270 struct ima_template_desc *template_desc);
271int process_buffer_measurement(struct user_namespace *mnt_userns,
272 struct inode *inode, const void *buf, int size,
273 const char *eventname, enum ima_hooks func,
274 int pcr, const char *func_data,
275 bool buf_hash, u8 *digest, size_t digest_len);
276void ima_audit_measurement(struct integrity_iint_cache *iint,
277 const unsigned char *filename);
278int ima_alloc_init_template(struct ima_event_data *event_data,
279 struct ima_template_entry **entry,
280 struct ima_template_desc *template_desc);
281int ima_store_template(struct ima_template_entry *entry, int violation,
282 struct inode *inode,
283 const unsigned char *filename, int pcr);
284void ima_free_template_entry(struct ima_template_entry *entry);
285const char *ima_d_path(const struct path *path, char **pathbuf, char *filename);
286
287
288int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode,
289 const struct cred *cred, u32 secid, enum ima_hooks func,
290 int mask, int flags, int *pcr,
291 struct ima_template_desc **template_desc,
292 const char *func_data, unsigned int *allowed_algos);
293void ima_init_policy(void);
294void ima_update_policy(void);
295void ima_update_policy_flags(void);
296ssize_t ima_parse_add_rule(char *);
297void ima_delete_rules(void);
298int ima_check_policy(void);
299void *ima_policy_start(struct seq_file *m, loff_t *pos);
300void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos);
301void ima_policy_stop(struct seq_file *m, void *v);
302int ima_policy_show(struct seq_file *m, void *v);
303
304
305#define IMA_APPRAISE_ENFORCE 0x01
306#define IMA_APPRAISE_FIX 0x02
307#define IMA_APPRAISE_LOG 0x04
308#define IMA_APPRAISE_MODULES 0x08
309#define IMA_APPRAISE_FIRMWARE 0x10
310#define IMA_APPRAISE_POLICY 0x20
311#define IMA_APPRAISE_KEXEC 0x40
312
313#ifdef CONFIG_IMA_APPRAISE
314int ima_check_blacklist(struct integrity_iint_cache *iint,
315 const struct modsig *modsig, int pcr);
316int ima_appraise_measurement(enum ima_hooks func,
317 struct integrity_iint_cache *iint,
318 struct file *file, const unsigned char *filename,
319 struct evm_ima_xattr_data *xattr_value,
320 int xattr_len, const struct modsig *modsig);
321int ima_must_appraise(struct user_namespace *mnt_userns, struct inode *inode,
322 int mask, enum ima_hooks func);
323void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
324enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
325 enum ima_hooks func);
326enum hash_algo ima_get_hash_algo(const struct evm_ima_xattr_data *xattr_value,
327 int xattr_len);
328int ima_read_xattr(struct dentry *dentry,
329 struct evm_ima_xattr_data **xattr_value);
330
331#else
332static inline int ima_check_blacklist(struct integrity_iint_cache *iint,
333 const struct modsig *modsig, int pcr)
334{
335 return 0;
336}
337
338static inline int ima_appraise_measurement(enum ima_hooks func,
339 struct integrity_iint_cache *iint,
340 struct file *file,
341 const unsigned char *filename,
342 struct evm_ima_xattr_data *xattr_value,
343 int xattr_len,
344 const struct modsig *modsig)
345{
346 return INTEGRITY_UNKNOWN;
347}
348
349static inline int ima_must_appraise(struct user_namespace *mnt_userns,
350 struct inode *inode, int mask,
351 enum ima_hooks func)
352{
353 return 0;
354}
355
356static inline void ima_update_xattr(struct integrity_iint_cache *iint,
357 struct file *file)
358{
359}
360
361static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
362 *iint,
363 enum ima_hooks func)
364{
365 return INTEGRITY_UNKNOWN;
366}
367
368static inline enum hash_algo
369ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len)
370{
371 return ima_hash_algo;
372}
373
374static inline int ima_read_xattr(struct dentry *dentry,
375 struct evm_ima_xattr_data **xattr_value)
376{
377 return 0;
378}
379
380#endif
381
382#ifdef CONFIG_IMA_APPRAISE_MODSIG
383int ima_read_modsig(enum ima_hooks func, const void *buf, loff_t buf_len,
384 struct modsig **modsig);
385void ima_collect_modsig(struct modsig *modsig, const void *buf, loff_t size);
386int ima_get_modsig_digest(const struct modsig *modsig, enum hash_algo *algo,
387 const u8 **digest, u32 *digest_size);
388int ima_get_raw_modsig(const struct modsig *modsig, const void **data,
389 u32 *data_len);
390void ima_free_modsig(struct modsig *modsig);
391#else
392static inline int ima_read_modsig(enum ima_hooks func, const void *buf,
393 loff_t buf_len, struct modsig **modsig)
394{
395 return -EOPNOTSUPP;
396}
397
398static inline void ima_collect_modsig(struct modsig *modsig, const void *buf,
399 loff_t size)
400{
401}
402
403static inline int ima_get_modsig_digest(const struct modsig *modsig,
404 enum hash_algo *algo, const u8 **digest,
405 u32 *digest_size)
406{
407 return -EOPNOTSUPP;
408}
409
410static inline int ima_get_raw_modsig(const struct modsig *modsig,
411 const void **data, u32 *data_len)
412{
413 return -EOPNOTSUPP;
414}
415
416static inline void ima_free_modsig(struct modsig *modsig)
417{
418}
419#endif
420
421
422#ifdef CONFIG_IMA_LSM_RULES
423
424#define ima_filter_rule_init security_audit_rule_init
425#define ima_filter_rule_free security_audit_rule_free
426#define ima_filter_rule_match security_audit_rule_match
427
428#else
429
430static inline int ima_filter_rule_init(u32 field, u32 op, char *rulestr,
431 void **lsmrule)
432{
433 return -EINVAL;
434}
435
436static inline void ima_filter_rule_free(void *lsmrule)
437{
438}
439
440static inline int ima_filter_rule_match(u32 secid, u32 field, u32 op,
441 void *lsmrule)
442{
443 return -EINVAL;
444}
445#endif
446
447#ifdef CONFIG_IMA_READ_POLICY
448#define POLICY_FILE_FLAGS (S_IWUSR | S_IRUSR)
449#else
450#define POLICY_FILE_FLAGS S_IWUSR
451#endif
452
453#endif
454