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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> | |
22 | #include <linux/security.h> | |
23 | #include <linux/hash.h> | |
24 | #include <linux/tpm.h> | |
25 | #include <linux/audit.h> | |
26 | ||
f381c272 MZ |
27 | #include "../integrity.h" |
28 | ||
3323eec9 MZ |
29 | enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII }; |
30 | enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 }; | |
31 | ||
32 | /* digest size for IMA, fits SHA1 or MD5 */ | |
f381c272 | 33 | #define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE |
3323eec9 MZ |
34 | #define IMA_EVENT_NAME_LEN_MAX 255 |
35 | ||
36 | #define IMA_HASH_BITS 9 | |
37 | #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS) | |
38 | ||
adf53a77 RS |
39 | #define IMA_TEMPLATE_FIELD_ID_MAX_LEN 16 |
40 | #define IMA_TEMPLATE_NUM_FIELDS_MAX 15 | |
41 | ||
3ce1217d RS |
42 | #define IMA_TEMPLATE_IMA_NAME "ima" |
43 | #define IMA_TEMPLATE_IMA_FMT "d|n" | |
44 | ||
3323eec9 MZ |
45 | /* set during initialization */ |
46 | extern int ima_initialized; | |
47 | extern int ima_used_chip; | |
c7c8bb23 | 48 | extern int ima_hash_algo; |
2fe5d6de | 49 | extern int ima_appraise; |
3323eec9 | 50 | |
adf53a77 RS |
51 | /* IMA template field data definition */ |
52 | struct ima_field_data { | |
53 | u8 *data; | |
54 | u32 len; | |
55 | }; | |
56 | ||
57 | /* IMA template field definition */ | |
58 | struct ima_template_field { | |
59 | const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN]; | |
60 | int (*field_init) (struct integrity_iint_cache *iint, struct file *file, | |
61 | const unsigned char *filename, | |
62 | struct ima_field_data *field_data); | |
63 | void (*field_show) (struct seq_file *m, enum ima_show_type show, | |
64 | struct ima_field_data *field_data); | |
65 | }; | |
66 | ||
67 | /* IMA template descriptor definition */ | |
68 | struct ima_template_desc { | |
69 | char *name; | |
70 | char *fmt; | |
71 | int num_fields; | |
72 | struct ima_template_field **fields; | |
73 | }; | |
74 | ||
3323eec9 MZ |
75 | /* IMA inode template definition */ |
76 | struct ima_template_data { | |
77 | u8 digest[IMA_DIGEST_SIZE]; /* sha1/md5 measurement hash */ | |
78 | char file_name[IMA_EVENT_NAME_LEN_MAX + 1]; /* name + \0 */ | |
79 | }; | |
80 | ||
81 | struct ima_template_entry { | |
140d8022 | 82 | u8 digest[TPM_DIGEST_SIZE]; /* sha1 or md5 measurement hash */ |
523979ad | 83 | const char *template_name; |
3323eec9 MZ |
84 | int template_len; |
85 | struct ima_template_data template; | |
86 | }; | |
87 | ||
88 | struct ima_queue_entry { | |
89 | struct hlist_node hnext; /* place in hash collision list */ | |
90 | struct list_head later; /* place in ima_measurements list */ | |
91 | struct ima_template_entry *entry; | |
92 | }; | |
93 | extern struct list_head ima_measurements; /* list of all measurements */ | |
94 | ||
3323eec9 | 95 | /* Internal IMA function definitions */ |
3323eec9 | 96 | int ima_init(void); |
bab73937 MZ |
97 | void ima_cleanup(void); |
98 | int ima_fs_init(void); | |
99 | void ima_fs_cleanup(void); | |
a178d202 | 100 | int ima_inode_alloc(struct inode *inode); |
3323eec9 | 101 | int ima_add_template_entry(struct ima_template_entry *entry, int violation, |
9803d413 RS |
102 | const char *op, struct inode *inode, |
103 | const unsigned char *filename); | |
c7c8bb23 DK |
104 | int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash); |
105 | int ima_calc_buffer_hash(const void *data, int len, | |
106 | struct ima_digest_data *hash); | |
09ef5435 | 107 | int __init ima_calc_boot_aggregate(struct ima_digest_data *hash); |
7d802a22 | 108 | void ima_add_violation(struct file *file, const unsigned char *filename, |
3323eec9 | 109 | const char *op, const char *cause); |
76bb28f6 | 110 | int ima_init_crypto(void); |
3ce1217d RS |
111 | void ima_putc(struct seq_file *m, void *data, int datalen); |
112 | void ima_print_digest(struct seq_file *m, u8 *digest, int size); | |
3323eec9 | 113 | |
adf53a77 RS |
114 | int ima_init_template(void); |
115 | ||
3323eec9 MZ |
116 | /* |
117 | * used to protect h_table and sha_table | |
118 | */ | |
119 | extern spinlock_t ima_queue_lock; | |
120 | ||
121 | struct ima_h_table { | |
122 | atomic_long_t len; /* number of stored measurements in the list */ | |
123 | atomic_long_t violations; | |
124 | struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; | |
125 | }; | |
126 | extern struct ima_h_table ima_htable; | |
127 | ||
128 | static inline unsigned long ima_hash_key(u8 *digest) | |
129 | { | |
130 | return hash_long(*digest, IMA_HASH_BITS); | |
131 | } | |
132 | ||
3323eec9 | 133 | /* LIM API function definitions */ |
d9d300cd | 134 | int ima_get_action(struct inode *inode, int mask, int function); |
1adace9b | 135 | int ima_must_measure(struct inode *inode, int mask, int function); |
f381c272 | 136 | int ima_collect_measurement(struct integrity_iint_cache *iint, |
d3634d0f DK |
137 | struct file *file, |
138 | struct evm_ima_xattr_data **xattr_value, | |
139 | int *xattr_len); | |
f381c272 | 140 | void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, |
3323eec9 | 141 | const unsigned char *filename); |
e7c568e0 PM |
142 | void ima_audit_measurement(struct integrity_iint_cache *iint, |
143 | const unsigned char *filename); | |
7bc5f447 RS |
144 | int ima_alloc_init_template(struct integrity_iint_cache *iint, |
145 | struct file *file, const unsigned char *filename, | |
146 | struct ima_template_entry **entry); | |
3323eec9 | 147 | int ima_store_template(struct ima_template_entry *entry, int violation, |
9803d413 | 148 | struct inode *inode, const unsigned char *filename); |
f381c272 | 149 | void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show); |
ea1046d4 | 150 | const char *ima_d_path(struct path *path, char **pathbuf); |
3323eec9 | 151 | |
85491641 | 152 | /* rbtree tree calls to lookup, insert, delete |
3323eec9 MZ |
153 | * integrity data associated with an inode. |
154 | */ | |
f381c272 MZ |
155 | struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); |
156 | struct integrity_iint_cache *integrity_iint_find(struct inode *inode); | |
3323eec9 MZ |
157 | |
158 | /* IMA policy related functions */ | |
16cac49f | 159 | enum ima_hooks { FILE_CHECK = 1, MMAP_CHECK, BPRM_CHECK, MODULE_CHECK, POST_SETATTR }; |
3323eec9 | 160 | |
2fe5d6de MZ |
161 | int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask, |
162 | int flags); | |
3323eec9 MZ |
163 | void ima_init_policy(void); |
164 | void ima_update_policy(void); | |
6ccd0456 | 165 | ssize_t ima_parse_add_rule(char *); |
4af4662f MZ |
166 | void ima_delete_rules(void); |
167 | ||
2fe5d6de MZ |
168 | /* Appraise integrity measurements */ |
169 | #define IMA_APPRAISE_ENFORCE 0x01 | |
170 | #define IMA_APPRAISE_FIX 0x02 | |
a7f2a366 | 171 | #define IMA_APPRAISE_MODULES 0x04 |
2fe5d6de MZ |
172 | |
173 | #ifdef CONFIG_IMA_APPRAISE | |
d79d72e0 | 174 | int ima_appraise_measurement(int func, struct integrity_iint_cache *iint, |
d3634d0f DK |
175 | struct file *file, const unsigned char *filename, |
176 | struct evm_ima_xattr_data *xattr_value, | |
177 | int xattr_len); | |
d26e1936 | 178 | int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func); |
2fe5d6de | 179 | void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file); |
d79d72e0 MZ |
180 | enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint, |
181 | int func); | |
d3634d0f DK |
182 | void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len, |
183 | struct ima_digest_data *hash); | |
184 | int ima_read_xattr(struct dentry *dentry, | |
185 | struct evm_ima_xattr_data **xattr_value); | |
2fe5d6de MZ |
186 | |
187 | #else | |
d79d72e0 MZ |
188 | static inline int ima_appraise_measurement(int func, |
189 | struct integrity_iint_cache *iint, | |
2fe5d6de | 190 | struct file *file, |
d3634d0f DK |
191 | const unsigned char *filename, |
192 | struct evm_ima_xattr_data *xattr_value, | |
193 | int xattr_len) | |
2fe5d6de MZ |
194 | { |
195 | return INTEGRITY_UNKNOWN; | |
196 | } | |
197 | ||
d26e1936 DK |
198 | static inline int ima_must_appraise(struct inode *inode, int mask, |
199 | enum ima_hooks func) | |
2fe5d6de MZ |
200 | { |
201 | return 0; | |
202 | } | |
203 | ||
204 | static inline void ima_update_xattr(struct integrity_iint_cache *iint, | |
205 | struct file *file) | |
206 | { | |
207 | } | |
d79d72e0 MZ |
208 | |
209 | static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache | |
210 | *iint, int func) | |
211 | { | |
212 | return INTEGRITY_UNKNOWN; | |
213 | } | |
d3634d0f DK |
214 | |
215 | static inline void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, | |
216 | int xattr_len, | |
217 | struct ima_digest_data *hash) | |
218 | { | |
219 | } | |
220 | ||
221 | static inline int ima_read_xattr(struct dentry *dentry, | |
222 | struct evm_ima_xattr_data **xattr_value) | |
223 | { | |
224 | return 0; | |
225 | } | |
226 | ||
2fe5d6de MZ |
227 | #endif |
228 | ||
4af4662f MZ |
229 | /* LSM based policy rules require audit */ |
230 | #ifdef CONFIG_IMA_LSM_RULES | |
231 | ||
232 | #define security_filter_rule_init security_audit_rule_init | |
233 | #define security_filter_rule_match security_audit_rule_match | |
234 | ||
235 | #else | |
236 | ||
237 | static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, | |
238 | void **lsmrule) | |
239 | { | |
240 | return -EINVAL; | |
241 | } | |
242 | ||
243 | static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, | |
244 | void *lsmrule, | |
245 | struct audit_context *actx) | |
246 | { | |
247 | return -EINVAL; | |
248 | } | |
249 | #endif /* CONFIG_IMA_LSM_RULES */ | |
3323eec9 | 250 | #endif |