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