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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 | ||
3e8e5503 | 29 | enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_BINARY_NO_FIELD_LEN, |
c019e307 | 30 | IMA_SHOW_BINARY_OLD_STRING_FMT, IMA_SHOW_ASCII }; |
3323eec9 MZ |
31 | enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 }; |
32 | ||
33 | /* digest size for IMA, fits SHA1 or MD5 */ | |
f381c272 | 34 | #define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE |
3323eec9 MZ |
35 | #define IMA_EVENT_NAME_LEN_MAX 255 |
36 | ||
37 | #define IMA_HASH_BITS 9 | |
38 | #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS) | |
39 | ||
adf53a77 RS |
40 | #define IMA_TEMPLATE_FIELD_ID_MAX_LEN 16 |
41 | #define IMA_TEMPLATE_NUM_FIELDS_MAX 15 | |
42 | ||
3ce1217d RS |
43 | #define IMA_TEMPLATE_IMA_NAME "ima" |
44 | #define IMA_TEMPLATE_IMA_FMT "d|n" | |
45 | ||
3323eec9 MZ |
46 | /* set during initialization */ |
47 | extern int ima_initialized; | |
48 | extern int ima_used_chip; | |
c7c8bb23 | 49 | extern int ima_hash_algo; |
2fe5d6de | 50 | extern int ima_appraise; |
3323eec9 | 51 | |
adf53a77 RS |
52 | /* IMA template field data definition */ |
53 | struct ima_field_data { | |
54 | u8 *data; | |
55 | u32 len; | |
56 | }; | |
57 | ||
58 | /* IMA template field definition */ | |
59 | struct ima_template_field { | |
60 | const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN]; | |
61 | int (*field_init) (struct integrity_iint_cache *iint, struct file *file, | |
62 | const unsigned char *filename, | |
bcbc9b0c MZ |
63 | struct evm_ima_xattr_data *xattr_value, |
64 | int xattr_len, struct ima_field_data *field_data); | |
adf53a77 RS |
65 | void (*field_show) (struct seq_file *m, enum ima_show_type show, |
66 | struct ima_field_data *field_data); | |
67 | }; | |
68 | ||
69 | /* IMA template descriptor definition */ | |
70 | struct ima_template_desc { | |
71 | char *name; | |
72 | char *fmt; | |
73 | int num_fields; | |
74 | struct ima_template_field **fields; | |
75 | }; | |
76 | ||
3323eec9 | 77 | struct ima_template_entry { |
140d8022 | 78 | u8 digest[TPM_DIGEST_SIZE]; /* sha1 or md5 measurement hash */ |
a71dc65d RS |
79 | struct ima_template_desc *template_desc; /* template descriptor */ |
80 | u32 template_data_len; | |
81 | struct ima_field_data template_data[0]; /* template related data */ | |
3323eec9 MZ |
82 | }; |
83 | ||
84 | struct ima_queue_entry { | |
85 | struct hlist_node hnext; /* place in hash collision list */ | |
86 | struct list_head later; /* place in ima_measurements list */ | |
87 | struct ima_template_entry *entry; | |
88 | }; | |
89 | extern struct list_head ima_measurements; /* list of all measurements */ | |
90 | ||
3323eec9 | 91 | /* Internal IMA function definitions */ |
3323eec9 | 92 | int ima_init(void); |
bab73937 MZ |
93 | void ima_cleanup(void); |
94 | int ima_fs_init(void); | |
95 | void ima_fs_cleanup(void); | |
a178d202 | 96 | int ima_inode_alloc(struct inode *inode); |
3323eec9 | 97 | int ima_add_template_entry(struct ima_template_entry *entry, int violation, |
9803d413 RS |
98 | const char *op, struct inode *inode, |
99 | const unsigned char *filename); | |
c7c8bb23 | 100 | int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash); |
b6f8f16f RS |
101 | int ima_calc_field_array_hash(struct ima_field_data *field_data, |
102 | struct ima_template_desc *desc, int num_fields, | |
a71dc65d | 103 | struct ima_digest_data *hash); |
09ef5435 | 104 | int __init ima_calc_boot_aggregate(struct ima_digest_data *hash); |
7d802a22 | 105 | void ima_add_violation(struct file *file, const unsigned char *filename, |
3323eec9 | 106 | const char *op, const char *cause); |
76bb28f6 | 107 | int ima_init_crypto(void); |
3ce1217d RS |
108 | void ima_putc(struct seq_file *m, void *data, int datalen); |
109 | void ima_print_digest(struct seq_file *m, u8 *digest, int size); | |
a71dc65d RS |
110 | struct ima_template_desc *ima_template_desc_current(void); |
111 | int ima_init_template(void); | |
3323eec9 | 112 | |
adf53a77 RS |
113 | int ima_init_template(void); |
114 | ||
3323eec9 MZ |
115 | /* |
116 | * used to protect h_table and sha_table | |
117 | */ | |
118 | extern spinlock_t ima_queue_lock; | |
119 | ||
120 | struct ima_h_table { | |
121 | atomic_long_t len; /* number of stored measurements in the list */ | |
122 | atomic_long_t violations; | |
123 | struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; | |
124 | }; | |
125 | extern struct ima_h_table ima_htable; | |
126 | ||
127 | static inline unsigned long ima_hash_key(u8 *digest) | |
128 | { | |
129 | return hash_long(*digest, IMA_HASH_BITS); | |
130 | } | |
131 | ||
3323eec9 | 132 | /* LIM API function definitions */ |
d9d300cd | 133 | int ima_get_action(struct inode *inode, int mask, int function); |
1adace9b | 134 | int ima_must_measure(struct inode *inode, int mask, int function); |
f381c272 | 135 | int ima_collect_measurement(struct integrity_iint_cache *iint, |
d3634d0f DK |
136 | struct file *file, |
137 | struct evm_ima_xattr_data **xattr_value, | |
138 | int *xattr_len); | |
f381c272 | 139 | void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, |
bcbc9b0c MZ |
140 | const unsigned char *filename, |
141 | struct evm_ima_xattr_data *xattr_value, | |
142 | int xattr_len); | |
e7c568e0 PM |
143 | void ima_audit_measurement(struct integrity_iint_cache *iint, |
144 | const unsigned char *filename); | |
7bc5f447 RS |
145 | int ima_alloc_init_template(struct integrity_iint_cache *iint, |
146 | struct file *file, const unsigned char *filename, | |
bcbc9b0c MZ |
147 | struct evm_ima_xattr_data *xattr_value, |
148 | int xattr_len, struct ima_template_entry **entry); | |
3323eec9 | 149 | int ima_store_template(struct ima_template_entry *entry, int violation, |
9803d413 | 150 | struct inode *inode, const unsigned char *filename); |
a7ed7c60 | 151 | void ima_free_template_entry(struct ima_template_entry *entry); |
ea1046d4 | 152 | const char *ima_d_path(struct path *path, char **pathbuf); |
3323eec9 | 153 | |
85491641 | 154 | /* rbtree tree calls to lookup, insert, delete |
3323eec9 MZ |
155 | * integrity data associated with an inode. |
156 | */ | |
f381c272 MZ |
157 | struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); |
158 | struct integrity_iint_cache *integrity_iint_find(struct inode *inode); | |
3323eec9 MZ |
159 | |
160 | /* IMA policy related functions */ | |
16cac49f | 161 | enum ima_hooks { FILE_CHECK = 1, MMAP_CHECK, BPRM_CHECK, MODULE_CHECK, POST_SETATTR }; |
3323eec9 | 162 | |
2fe5d6de MZ |
163 | int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask, |
164 | int flags); | |
3323eec9 MZ |
165 | void ima_init_policy(void); |
166 | void ima_update_policy(void); | |
6ccd0456 | 167 | ssize_t ima_parse_add_rule(char *); |
4af4662f MZ |
168 | void ima_delete_rules(void); |
169 | ||
2fe5d6de MZ |
170 | /* Appraise integrity measurements */ |
171 | #define IMA_APPRAISE_ENFORCE 0x01 | |
172 | #define IMA_APPRAISE_FIX 0x02 | |
a7f2a366 | 173 | #define IMA_APPRAISE_MODULES 0x04 |
2fe5d6de MZ |
174 | |
175 | #ifdef CONFIG_IMA_APPRAISE | |
d79d72e0 | 176 | int ima_appraise_measurement(int func, struct integrity_iint_cache *iint, |
d3634d0f DK |
177 | struct file *file, const unsigned char *filename, |
178 | struct evm_ima_xattr_data *xattr_value, | |
179 | int xattr_len); | |
d26e1936 | 180 | int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func); |
2fe5d6de | 181 | void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file); |
d79d72e0 MZ |
182 | enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint, |
183 | int func); | |
d3634d0f DK |
184 | void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len, |
185 | struct ima_digest_data *hash); | |
186 | int ima_read_xattr(struct dentry *dentry, | |
187 | struct evm_ima_xattr_data **xattr_value); | |
2fe5d6de MZ |
188 | |
189 | #else | |
d79d72e0 MZ |
190 | static inline int ima_appraise_measurement(int func, |
191 | struct integrity_iint_cache *iint, | |
2fe5d6de | 192 | struct file *file, |
d3634d0f DK |
193 | const unsigned char *filename, |
194 | struct evm_ima_xattr_data *xattr_value, | |
195 | int xattr_len) | |
2fe5d6de MZ |
196 | { |
197 | return INTEGRITY_UNKNOWN; | |
198 | } | |
199 | ||
d26e1936 DK |
200 | static inline int ima_must_appraise(struct inode *inode, int mask, |
201 | enum ima_hooks func) | |
2fe5d6de MZ |
202 | { |
203 | return 0; | |
204 | } | |
205 | ||
206 | static inline void ima_update_xattr(struct integrity_iint_cache *iint, | |
207 | struct file *file) | |
208 | { | |
209 | } | |
d79d72e0 MZ |
210 | |
211 | static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache | |
212 | *iint, int func) | |
213 | { | |
214 | return INTEGRITY_UNKNOWN; | |
215 | } | |
d3634d0f DK |
216 | |
217 | static inline void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, | |
218 | int xattr_len, | |
219 | struct ima_digest_data *hash) | |
220 | { | |
221 | } | |
222 | ||
223 | static inline int ima_read_xattr(struct dentry *dentry, | |
224 | struct evm_ima_xattr_data **xattr_value) | |
225 | { | |
226 | return 0; | |
227 | } | |
228 | ||
2fe5d6de MZ |
229 | #endif |
230 | ||
4af4662f MZ |
231 | /* LSM based policy rules require audit */ |
232 | #ifdef CONFIG_IMA_LSM_RULES | |
233 | ||
234 | #define security_filter_rule_init security_audit_rule_init | |
235 | #define security_filter_rule_match security_audit_rule_match | |
236 | ||
237 | #else | |
238 | ||
239 | static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, | |
240 | void **lsmrule) | |
241 | { | |
242 | return -EINVAL; | |
243 | } | |
244 | ||
245 | static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, | |
246 | void *lsmrule, | |
247 | struct audit_context *actx) | |
248 | { | |
249 | return -EINVAL; | |
250 | } | |
251 | #endif /* CONFIG_IMA_LSM_RULES */ | |
3323eec9 | 252 | #endif |