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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; | |
42 | extern char *ima_hash; | |
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 { | |
52 | u8 digest[IMA_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 | ||
417c6c8e | 65 | #ifdef CONFIG_IMA_AUDIT |
3323eec9 MZ |
66 | /* declarations */ |
67 | void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
68 | const unsigned char *fname, const char *op, | |
69 | const char *cause, int result, int info); | |
417c6c8e DK |
70 | #else |
71 | static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
72 | const unsigned char *fname, | |
73 | const char *op, const char *cause, | |
74 | int result, int info) | |
75 | { | |
76 | } | |
77 | #endif | |
3323eec9 MZ |
78 | |
79 | /* Internal IMA function definitions */ | |
3323eec9 | 80 | int ima_init(void); |
bab73937 MZ |
81 | void ima_cleanup(void); |
82 | int ima_fs_init(void); | |
83 | void ima_fs_cleanup(void); | |
a178d202 | 84 | int ima_inode_alloc(struct inode *inode); |
3323eec9 MZ |
85 | int ima_add_template_entry(struct ima_template_entry *entry, int violation, |
86 | const char *op, struct inode *inode); | |
87 | int ima_calc_hash(struct file *file, char *digest); | |
88 | int ima_calc_template_hash(int template_len, void *template, char *digest); | |
89 | int ima_calc_boot_aggregate(char *digest); | |
90 | void ima_add_violation(struct inode *inode, const unsigned char *filename, | |
91 | const char *op, const char *cause); | |
92 | ||
93 | /* | |
94 | * used to protect h_table and sha_table | |
95 | */ | |
96 | extern spinlock_t ima_queue_lock; | |
97 | ||
98 | struct ima_h_table { | |
99 | atomic_long_t len; /* number of stored measurements in the list */ | |
100 | atomic_long_t violations; | |
101 | struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; | |
102 | }; | |
103 | extern struct ima_h_table ima_htable; | |
104 | ||
105 | static inline unsigned long ima_hash_key(u8 *digest) | |
106 | { | |
107 | return hash_long(*digest, IMA_HASH_BITS); | |
108 | } | |
109 | ||
3323eec9 | 110 | /* LIM API function definitions */ |
2fe5d6de | 111 | int ima_must_appraise_or_measure(struct inode *inode, int mask, int function); |
1adace9b | 112 | int ima_must_measure(struct inode *inode, int mask, int function); |
f381c272 MZ |
113 | int ima_collect_measurement(struct integrity_iint_cache *iint, |
114 | struct file *file); | |
115 | void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, | |
3323eec9 MZ |
116 | const unsigned char *filename); |
117 | int ima_store_template(struct ima_template_entry *entry, int violation, | |
118 | struct inode *inode); | |
f381c272 | 119 | void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show); |
3323eec9 | 120 | |
85491641 | 121 | /* rbtree tree calls to lookup, insert, delete |
3323eec9 MZ |
122 | * integrity data associated with an inode. |
123 | */ | |
f381c272 MZ |
124 | struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); |
125 | struct integrity_iint_cache *integrity_iint_find(struct inode *inode); | |
3323eec9 MZ |
126 | |
127 | /* IMA policy related functions */ | |
2fe5d6de | 128 | enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK, POST_SETATTR }; |
3323eec9 | 129 | |
2fe5d6de MZ |
130 | int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask, |
131 | int flags); | |
3323eec9 MZ |
132 | void ima_init_policy(void); |
133 | void ima_update_policy(void); | |
6ccd0456 | 134 | ssize_t ima_parse_add_rule(char *); |
4af4662f MZ |
135 | void ima_delete_rules(void); |
136 | ||
2fe5d6de MZ |
137 | /* Appraise integrity measurements */ |
138 | #define IMA_APPRAISE_ENFORCE 0x01 | |
139 | #define IMA_APPRAISE_FIX 0x02 | |
140 | ||
141 | #ifdef CONFIG_IMA_APPRAISE | |
142 | int ima_appraise_measurement(struct integrity_iint_cache *iint, | |
143 | struct file *file, const unsigned char *filename); | |
144 | int ima_must_appraise(struct inode *inode, enum ima_hooks func, int mask); | |
145 | void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file); | |
146 | ||
147 | #else | |
148 | static inline int ima_appraise_measurement(struct integrity_iint_cache *iint, | |
149 | struct file *file, | |
150 | const unsigned char *filename) | |
151 | { | |
152 | return INTEGRITY_UNKNOWN; | |
153 | } | |
154 | ||
155 | static inline int ima_must_appraise(struct inode *inode, | |
156 | enum ima_hooks func, int mask) | |
157 | { | |
158 | return 0; | |
159 | } | |
160 | ||
161 | static inline void ima_update_xattr(struct integrity_iint_cache *iint, | |
162 | struct file *file) | |
163 | { | |
164 | } | |
165 | #endif | |
166 | ||
4af4662f MZ |
167 | /* LSM based policy rules require audit */ |
168 | #ifdef CONFIG_IMA_LSM_RULES | |
169 | ||
170 | #define security_filter_rule_init security_audit_rule_init | |
171 | #define security_filter_rule_match security_audit_rule_match | |
172 | ||
173 | #else | |
174 | ||
175 | static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, | |
176 | void **lsmrule) | |
177 | { | |
178 | return -EINVAL; | |
179 | } | |
180 | ||
181 | static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, | |
182 | void *lsmrule, | |
183 | struct audit_context *actx) | |
184 | { | |
185 | return -EINVAL; | |
186 | } | |
187 | #endif /* CONFIG_IMA_LSM_RULES */ | |
3323eec9 | 188 | #endif |