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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 | ||
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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 |
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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; | |
43 | ||
44 | /* IMA inode template definition */ | |
45 | struct ima_template_data { | |
46 | u8 digest[IMA_DIGEST_SIZE]; /* sha1/md5 measurement hash */ | |
47 | char file_name[IMA_EVENT_NAME_LEN_MAX + 1]; /* name + \0 */ | |
48 | }; | |
49 | ||
50 | struct ima_template_entry { | |
51 | u8 digest[IMA_DIGEST_SIZE]; /* sha1 or md5 measurement hash */ | |
523979ad | 52 | const char *template_name; |
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53 | int template_len; |
54 | struct ima_template_data template; | |
55 | }; | |
56 | ||
57 | struct ima_queue_entry { | |
58 | struct hlist_node hnext; /* place in hash collision list */ | |
59 | struct list_head later; /* place in ima_measurements list */ | |
60 | struct ima_template_entry *entry; | |
61 | }; | |
62 | extern struct list_head ima_measurements; /* list of all measurements */ | |
63 | ||
417c6c8e | 64 | #ifdef CONFIG_IMA_AUDIT |
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65 | /* declarations */ |
66 | void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
67 | const unsigned char *fname, const char *op, | |
68 | const char *cause, int result, int info); | |
417c6c8e DK |
69 | #else |
70 | static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
71 | const unsigned char *fname, | |
72 | const char *op, const char *cause, | |
73 | int result, int info) | |
74 | { | |
75 | } | |
76 | #endif | |
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77 | |
78 | /* Internal IMA function definitions */ | |
3323eec9 | 79 | int ima_init(void); |
bab73937 MZ |
80 | void ima_cleanup(void); |
81 | int ima_fs_init(void); | |
82 | void ima_fs_cleanup(void); | |
a178d202 | 83 | int ima_inode_alloc(struct inode *inode); |
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84 | int ima_add_template_entry(struct ima_template_entry *entry, int violation, |
85 | const char *op, struct inode *inode); | |
86 | int ima_calc_hash(struct file *file, char *digest); | |
87 | int ima_calc_template_hash(int template_len, void *template, char *digest); | |
88 | int ima_calc_boot_aggregate(char *digest); | |
89 | void ima_add_violation(struct inode *inode, const unsigned char *filename, | |
90 | const char *op, const char *cause); | |
91 | ||
92 | /* | |
93 | * used to protect h_table and sha_table | |
94 | */ | |
95 | extern spinlock_t ima_queue_lock; | |
96 | ||
97 | struct ima_h_table { | |
98 | atomic_long_t len; /* number of stored measurements in the list */ | |
99 | atomic_long_t violations; | |
100 | struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; | |
101 | }; | |
102 | extern struct ima_h_table ima_htable; | |
103 | ||
104 | static inline unsigned long ima_hash_key(u8 *digest) | |
105 | { | |
106 | return hash_long(*digest, IMA_HASH_BITS); | |
107 | } | |
108 | ||
3323eec9 | 109 | /* LIM API function definitions */ |
1adace9b | 110 | int ima_must_measure(struct inode *inode, int mask, int function); |
f381c272 MZ |
111 | int ima_collect_measurement(struct integrity_iint_cache *iint, |
112 | struct file *file); | |
113 | void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, | |
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114 | const unsigned char *filename); |
115 | int ima_store_template(struct ima_template_entry *entry, int violation, | |
116 | struct inode *inode); | |
f381c272 | 117 | void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show); |
3323eec9 | 118 | |
85491641 | 119 | /* rbtree tree calls to lookup, insert, delete |
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120 | * integrity data associated with an inode. |
121 | */ | |
f381c272 MZ |
122 | struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); |
123 | struct integrity_iint_cache *integrity_iint_find(struct inode *inode); | |
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124 | |
125 | /* IMA policy related functions */ | |
1e93d005 | 126 | enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK }; |
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127 | |
128 | int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask); | |
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 | ||
134 | /* LSM based policy rules require audit */ | |
135 | #ifdef CONFIG_IMA_LSM_RULES | |
136 | ||
137 | #define security_filter_rule_init security_audit_rule_init | |
138 | #define security_filter_rule_match security_audit_rule_match | |
139 | ||
140 | #else | |
141 | ||
142 | static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, | |
143 | void **lsmrule) | |
144 | { | |
145 | return -EINVAL; | |
146 | } | |
147 | ||
148 | static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, | |
149 | void *lsmrule, | |
150 | struct audit_context *actx) | |
151 | { | |
152 | return -EINVAL; | |
153 | } | |
154 | #endif /* CONFIG_IMA_LSM_RULES */ | |
3323eec9 | 155 | #endif |