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3323eec9 MZ |
1 | /* |
2 | * Copyright (C) 2005,2006,2007,2008 IBM Corporation | |
3 | * | |
4 | * Authors: | |
5 | * Reiner Sailer <sailer@watson.ibm.com> | |
6 | * Mimi Zohar <zohar@us.ibm.com> | |
7 | * | |
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 | |
11 | * License. | |
12 | * | |
13 | * File: ima.h | |
14 | * internal Integrity Measurement Architecture (IMA) definitions | |
15 | */ | |
16 | ||
17 | #ifndef __LINUX_IMA_H | |
18 | #define __LINUX_IMA_H | |
19 | ||
20 | #include <linux/types.h> | |
21 | #include <linux/crypto.h> | |
cf222217 | 22 | #include <linux/fs.h> |
3323eec9 MZ |
23 | #include <linux/security.h> |
24 | #include <linux/hash.h> | |
25 | #include <linux/tpm.h> | |
26 | #include <linux/audit.h> | |
1525b06d | 27 | #include <crypto/hash_info.h> |
3323eec9 | 28 | |
f381c272 MZ |
29 | #include "../integrity.h" |
30 | ||
3e8e5503 | 31 | enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_BINARY_NO_FIELD_LEN, |
c019e307 | 32 | IMA_SHOW_BINARY_OLD_STRING_FMT, IMA_SHOW_ASCII }; |
3323eec9 MZ |
33 | enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 }; |
34 | ||
35 | /* digest size for IMA, fits SHA1 or MD5 */ | |
f381c272 | 36 | #define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE |
3323eec9 MZ |
37 | #define IMA_EVENT_NAME_LEN_MAX 255 |
38 | ||
39 | #define IMA_HASH_BITS 9 | |
40 | #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS) | |
41 | ||
adf53a77 RS |
42 | #define IMA_TEMPLATE_FIELD_ID_MAX_LEN 16 |
43 | #define IMA_TEMPLATE_NUM_FIELDS_MAX 15 | |
44 | ||
3ce1217d RS |
45 | #define IMA_TEMPLATE_IMA_NAME "ima" |
46 | #define IMA_TEMPLATE_IMA_FMT "d|n" | |
47 | ||
a756024e RS |
48 | /* current content of the policy */ |
49 | extern int ima_policy_flag; | |
50 | ||
3323eec9 MZ |
51 | /* set during initialization */ |
52 | extern int ima_initialized; | |
53 | extern int ima_used_chip; | |
c7c8bb23 | 54 | extern int ima_hash_algo; |
2fe5d6de | 55 | extern int ima_appraise; |
3323eec9 | 56 | |
23b57419 RS |
57 | /* IMA event related data */ |
58 | struct ima_event_data { | |
59 | struct integrity_iint_cache *iint; | |
60 | struct file *file; | |
61 | const unsigned char *filename; | |
62 | struct evm_ima_xattr_data *xattr_value; | |
63 | int xattr_len; | |
8d94eb9b | 64 | const char *violation; |
23b57419 RS |
65 | }; |
66 | ||
adf53a77 RS |
67 | /* IMA template field data definition */ |
68 | struct ima_field_data { | |
69 | u8 *data; | |
70 | u32 len; | |
71 | }; | |
72 | ||
73 | /* IMA template field definition */ | |
74 | struct ima_template_field { | |
75 | const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN]; | |
23b57419 RS |
76 | int (*field_init)(struct ima_event_data *event_data, |
77 | struct ima_field_data *field_data); | |
78 | void (*field_show)(struct seq_file *m, enum ima_show_type show, | |
79 | struct ima_field_data *field_data); | |
adf53a77 RS |
80 | }; |
81 | ||
82 | /* IMA template descriptor definition */ | |
83 | struct ima_template_desc { | |
84 | char *name; | |
85 | char *fmt; | |
86 | int num_fields; | |
87 | struct ima_template_field **fields; | |
88 | }; | |
89 | ||
3323eec9 | 90 | struct ima_template_entry { |
140d8022 | 91 | u8 digest[TPM_DIGEST_SIZE]; /* sha1 or md5 measurement hash */ |
a71dc65d RS |
92 | struct ima_template_desc *template_desc; /* template descriptor */ |
93 | u32 template_data_len; | |
94 | struct ima_field_data template_data[0]; /* template related data */ | |
3323eec9 MZ |
95 | }; |
96 | ||
97 | struct ima_queue_entry { | |
98 | struct hlist_node hnext; /* place in hash collision list */ | |
99 | struct list_head later; /* place in ima_measurements list */ | |
100 | struct ima_template_entry *entry; | |
101 | }; | |
102 | extern struct list_head ima_measurements; /* list of all measurements */ | |
103 | ||
3323eec9 | 104 | /* Internal IMA function definitions */ |
3323eec9 | 105 | int ima_init(void); |
bab73937 | 106 | int ima_fs_init(void); |
3323eec9 | 107 | int ima_add_template_entry(struct ima_template_entry *entry, int violation, |
9803d413 RS |
108 | const char *op, struct inode *inode, |
109 | const unsigned char *filename); | |
c7c8bb23 | 110 | int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash); |
11d7646d DK |
111 | int ima_calc_buffer_hash(const void *buf, loff_t len, |
112 | struct ima_digest_data *hash); | |
b6f8f16f RS |
113 | int ima_calc_field_array_hash(struct ima_field_data *field_data, |
114 | struct ima_template_desc *desc, int num_fields, | |
a71dc65d | 115 | struct ima_digest_data *hash); |
09ef5435 | 116 | int __init ima_calc_boot_aggregate(struct ima_digest_data *hash); |
7d802a22 | 117 | void ima_add_violation(struct file *file, const unsigned char *filename, |
8d94eb9b | 118 | struct integrity_iint_cache *iint, |
3323eec9 | 119 | const char *op, const char *cause); |
76bb28f6 | 120 | int ima_init_crypto(void); |
3ce1217d | 121 | void ima_putc(struct seq_file *m, void *data, int datalen); |
45b26133 | 122 | void ima_print_digest(struct seq_file *m, u8 *digest, u32 size); |
a71dc65d RS |
123 | struct ima_template_desc *ima_template_desc_current(void); |
124 | int ima_init_template(void); | |
3323eec9 MZ |
125 | |
126 | /* | |
127 | * used to protect h_table and sha_table | |
128 | */ | |
129 | extern spinlock_t ima_queue_lock; | |
130 | ||
131 | struct ima_h_table { | |
132 | atomic_long_t len; /* number of stored measurements in the list */ | |
133 | atomic_long_t violations; | |
134 | struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; | |
135 | }; | |
136 | extern struct ima_h_table ima_htable; | |
137 | ||
138 | static inline unsigned long ima_hash_key(u8 *digest) | |
139 | { | |
140 | return hash_long(*digest, IMA_HASH_BITS); | |
141 | } | |
142 | ||
4ad87a3d MZ |
143 | enum ima_hooks { |
144 | FILE_CHECK = 1, | |
145 | MMAP_CHECK, | |
146 | BPRM_CHECK, | |
c6af8efe | 147 | POST_SETATTR, |
4ad87a3d MZ |
148 | MODULE_CHECK, |
149 | FIRMWARE_CHECK, | |
d9ddf077 MZ |
150 | KEXEC_KERNEL_CHECK, |
151 | KEXEC_INITRAMFS_CHECK, | |
19f8a847 | 152 | POLICY_CHECK, |
c6af8efe | 153 | MAX_CHECK |
4ad87a3d MZ |
154 | }; |
155 | ||
3323eec9 | 156 | /* LIM API function definitions */ |
4ad87a3d MZ |
157 | int ima_get_action(struct inode *inode, int mask, enum ima_hooks func); |
158 | int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func); | |
f381c272 | 159 | int ima_collect_measurement(struct integrity_iint_cache *iint, |
cf222217 MZ |
160 | struct file *file, void *buf, loff_t size, |
161 | enum hash_algo algo); | |
f381c272 | 162 | void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, |
bcbc9b0c MZ |
163 | const unsigned char *filename, |
164 | struct evm_ima_xattr_data *xattr_value, | |
165 | int xattr_len); | |
e7c568e0 PM |
166 | void ima_audit_measurement(struct integrity_iint_cache *iint, |
167 | const unsigned char *filename); | |
23b57419 RS |
168 | int ima_alloc_init_template(struct ima_event_data *event_data, |
169 | struct ima_template_entry **entry); | |
3323eec9 | 170 | int ima_store_template(struct ima_template_entry *entry, int violation, |
9803d413 | 171 | struct inode *inode, const unsigned char *filename); |
a7ed7c60 | 172 | void ima_free_template_entry(struct ima_template_entry *entry); |
ea1046d4 | 173 | const char *ima_d_path(struct path *path, char **pathbuf); |
3323eec9 | 174 | |
3323eec9 | 175 | /* IMA policy related functions */ |
2fe5d6de MZ |
176 | int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask, |
177 | int flags); | |
3323eec9 MZ |
178 | void ima_init_policy(void); |
179 | void ima_update_policy(void); | |
a756024e | 180 | void ima_update_policy_flag(void); |
6ccd0456 | 181 | ssize_t ima_parse_add_rule(char *); |
4af4662f | 182 | void ima_delete_rules(void); |
0112721d | 183 | int ima_check_policy(void); |
80eae209 PM |
184 | void *ima_policy_start(struct seq_file *m, loff_t *pos); |
185 | void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos); | |
186 | void ima_policy_stop(struct seq_file *m, void *v); | |
187 | int ima_policy_show(struct seq_file *m, void *v); | |
4af4662f | 188 | |
2fe5d6de MZ |
189 | /* Appraise integrity measurements */ |
190 | #define IMA_APPRAISE_ENFORCE 0x01 | |
191 | #define IMA_APPRAISE_FIX 0x02 | |
2faa6ef3 DK |
192 | #define IMA_APPRAISE_LOG 0x04 |
193 | #define IMA_APPRAISE_MODULES 0x08 | |
194 | #define IMA_APPRAISE_FIRMWARE 0x10 | |
19f8a847 | 195 | #define IMA_APPRAISE_POLICY 0x20 |
2fe5d6de MZ |
196 | |
197 | #ifdef CONFIG_IMA_APPRAISE | |
4ad87a3d MZ |
198 | int ima_appraise_measurement(enum ima_hooks func, |
199 | struct integrity_iint_cache *iint, | |
d3634d0f DK |
200 | struct file *file, const unsigned char *filename, |
201 | struct evm_ima_xattr_data *xattr_value, | |
3034a146 | 202 | int xattr_len, int opened); |
d26e1936 | 203 | int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func); |
2fe5d6de | 204 | void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file); |
d79d72e0 | 205 | enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint, |
4ad87a3d | 206 | enum ima_hooks func); |
1525b06d DK |
207 | enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, |
208 | int xattr_len); | |
d3634d0f DK |
209 | int ima_read_xattr(struct dentry *dentry, |
210 | struct evm_ima_xattr_data **xattr_value); | |
2fe5d6de MZ |
211 | |
212 | #else | |
4ad87a3d | 213 | static inline int ima_appraise_measurement(enum ima_hooks func, |
d79d72e0 | 214 | struct integrity_iint_cache *iint, |
2fe5d6de | 215 | struct file *file, |
d3634d0f DK |
216 | const unsigned char *filename, |
217 | struct evm_ima_xattr_data *xattr_value, | |
3034a146 | 218 | int xattr_len, int opened) |
2fe5d6de MZ |
219 | { |
220 | return INTEGRITY_UNKNOWN; | |
221 | } | |
222 | ||
d26e1936 DK |
223 | static inline int ima_must_appraise(struct inode *inode, int mask, |
224 | enum ima_hooks func) | |
2fe5d6de MZ |
225 | { |
226 | return 0; | |
227 | } | |
228 | ||
229 | static inline void ima_update_xattr(struct integrity_iint_cache *iint, | |
230 | struct file *file) | |
231 | { | |
232 | } | |
d79d72e0 MZ |
233 | |
234 | static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache | |
4ad87a3d MZ |
235 | *iint, |
236 | enum ima_hooks func) | |
d79d72e0 MZ |
237 | { |
238 | return INTEGRITY_UNKNOWN; | |
239 | } | |
d3634d0f | 240 | |
1525b06d DK |
241 | static inline enum hash_algo |
242 | ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len) | |
d3634d0f | 243 | { |
1525b06d | 244 | return ima_hash_algo; |
d3634d0f DK |
245 | } |
246 | ||
247 | static inline int ima_read_xattr(struct dentry *dentry, | |
248 | struct evm_ima_xattr_data **xattr_value) | |
249 | { | |
250 | return 0; | |
251 | } | |
252 | ||
2fe5d6de MZ |
253 | #endif |
254 | ||
4af4662f MZ |
255 | /* LSM based policy rules require audit */ |
256 | #ifdef CONFIG_IMA_LSM_RULES | |
257 | ||
258 | #define security_filter_rule_init security_audit_rule_init | |
259 | #define security_filter_rule_match security_audit_rule_match | |
260 | ||
261 | #else | |
262 | ||
263 | static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, | |
264 | void **lsmrule) | |
265 | { | |
266 | return -EINVAL; | |
267 | } | |
268 | ||
269 | static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, | |
270 | void *lsmrule, | |
271 | struct audit_context *actx) | |
272 | { | |
273 | return -EINVAL; | |
274 | } | |
80eae209 PM |
275 | #endif /* CONFIG_IMA_TRUSTED_KEYRING */ |
276 | ||
277 | #ifdef CONFIG_IMA_READ_POLICY | |
278 | #define POLICY_FILE_FLAGS (S_IWUSR | S_IRUSR) | |
279 | #else | |
280 | #define POLICY_FILE_FLAGS S_IWUSR | |
281 | #endif /* CONFIG_IMA_WRITE_POLICY */ | |
282 | ||
283 | #endif /* __LINUX_IMA_H */ |