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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 | ||
27 | enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII }; | |
28 | enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 }; | |
29 | ||
30 | /* digest size for IMA, fits SHA1 or MD5 */ | |
31 | #define IMA_DIGEST_SIZE 20 | |
32 | #define IMA_EVENT_NAME_LEN_MAX 255 | |
33 | ||
34 | #define IMA_HASH_BITS 9 | |
35 | #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS) | |
36 | ||
37 | /* set during initialization */ | |
38 | extern int ima_initialized; | |
39 | extern int ima_used_chip; | |
40 | extern char *ima_hash; | |
41 | ||
42 | /* IMA inode template definition */ | |
43 | struct ima_template_data { | |
44 | u8 digest[IMA_DIGEST_SIZE]; /* sha1/md5 measurement hash */ | |
45 | char file_name[IMA_EVENT_NAME_LEN_MAX + 1]; /* name + \0 */ | |
46 | }; | |
47 | ||
48 | struct ima_template_entry { | |
49 | u8 digest[IMA_DIGEST_SIZE]; /* sha1 or md5 measurement hash */ | |
50 | char *template_name; | |
51 | int template_len; | |
52 | struct ima_template_data template; | |
53 | }; | |
54 | ||
55 | struct ima_queue_entry { | |
56 | struct hlist_node hnext; /* place in hash collision list */ | |
57 | struct list_head later; /* place in ima_measurements list */ | |
58 | struct ima_template_entry *entry; | |
59 | }; | |
60 | extern struct list_head ima_measurements; /* list of all measurements */ | |
61 | ||
62 | /* declarations */ | |
63 | void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
64 | const unsigned char *fname, const char *op, | |
65 | const char *cause, int result, int info); | |
66 | ||
67 | /* Internal IMA function definitions */ | |
68 | void ima_iintcache_init(void); | |
69 | int ima_init(void); | |
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70 | void ima_cleanup(void); |
71 | int ima_fs_init(void); | |
72 | void ima_fs_cleanup(void); | |
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73 | int ima_add_template_entry(struct ima_template_entry *entry, int violation, |
74 | const char *op, struct inode *inode); | |
75 | int ima_calc_hash(struct file *file, char *digest); | |
76 | int ima_calc_template_hash(int template_len, void *template, char *digest); | |
77 | int ima_calc_boot_aggregate(char *digest); | |
78 | void ima_add_violation(struct inode *inode, const unsigned char *filename, | |
79 | const char *op, const char *cause); | |
80 | ||
81 | /* | |
82 | * used to protect h_table and sha_table | |
83 | */ | |
84 | extern spinlock_t ima_queue_lock; | |
85 | ||
86 | struct ima_h_table { | |
87 | atomic_long_t len; /* number of stored measurements in the list */ | |
88 | atomic_long_t violations; | |
89 | struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; | |
90 | }; | |
91 | extern struct ima_h_table ima_htable; | |
92 | ||
93 | static inline unsigned long ima_hash_key(u8 *digest) | |
94 | { | |
95 | return hash_long(*digest, IMA_HASH_BITS); | |
96 | } | |
97 | ||
98 | /* iint cache flags */ | |
99 | #define IMA_MEASURED 1 | |
1df9f0a7 | 100 | #define IMA_IINT_DUMP_STACK 512 |
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101 | |
102 | /* integrity data associated with an inode */ | |
103 | struct ima_iint_cache { | |
104 | u64 version; /* track inode changes */ | |
105 | unsigned long flags; | |
106 | u8 digest[IMA_DIGEST_SIZE]; | |
107 | struct mutex mutex; /* protects: version, flags, digest */ | |
108 | long readcount; /* measured files readcount */ | |
109 | long writecount; /* measured files writecount */ | |
1df9f0a7 | 110 | long opencount; /* opens reference count */ |
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111 | struct kref refcount; /* ima_iint_cache reference count */ |
112 | struct rcu_head rcu; | |
113 | }; | |
114 | ||
115 | /* LIM API function definitions */ | |
116 | int ima_must_measure(struct ima_iint_cache *iint, struct inode *inode, | |
117 | int mask, int function); | |
118 | int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file); | |
119 | void ima_store_measurement(struct ima_iint_cache *iint, struct file *file, | |
120 | const unsigned char *filename); | |
121 | int ima_store_template(struct ima_template_entry *entry, int violation, | |
122 | struct inode *inode); | |
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123 | void ima_template_show(struct seq_file *m, void *e, |
124 | enum ima_show_type show); | |
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125 | |
126 | /* radix tree calls to lookup, insert, delete | |
127 | * integrity data associated with an inode. | |
128 | */ | |
129 | struct ima_iint_cache *ima_iint_insert(struct inode *inode); | |
130 | struct ima_iint_cache *ima_iint_find_get(struct inode *inode); | |
131 | struct ima_iint_cache *ima_iint_find_insert_get(struct inode *inode); | |
132 | void ima_iint_delete(struct inode *inode); | |
133 | void iint_free(struct kref *kref); | |
134 | void iint_rcu_free(struct rcu_head *rcu); | |
135 | ||
136 | /* IMA policy related functions */ | |
137 | enum ima_hooks { PATH_CHECK = 1, FILE_MMAP, BPRM_CHECK }; | |
138 | ||
139 | int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask); | |
140 | void ima_init_policy(void); | |
141 | void ima_update_policy(void); | |
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142 | int ima_parse_add_rule(char *); |
143 | void ima_delete_rules(void); | |
144 | ||
145 | /* LSM based policy rules require audit */ | |
146 | #ifdef CONFIG_IMA_LSM_RULES | |
147 | ||
148 | #define security_filter_rule_init security_audit_rule_init | |
149 | #define security_filter_rule_match security_audit_rule_match | |
150 | ||
151 | #else | |
152 | ||
153 | static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, | |
154 | void **lsmrule) | |
155 | { | |
156 | return -EINVAL; | |
157 | } | |
158 | ||
159 | static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, | |
160 | void *lsmrule, | |
161 | struct audit_context *actx) | |
162 | { | |
163 | return -EINVAL; | |
164 | } | |
165 | #endif /* CONFIG_IMA_LSM_RULES */ | |
3323eec9 | 166 | #endif |