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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 */ | |
e950598d | 38 | extern int iint_initialized; |
3323eec9 MZ |
39 | extern int ima_initialized; |
40 | extern int ima_used_chip; | |
41 | extern char *ima_hash; | |
42 | ||
43 | /* IMA inode template definition */ | |
44 | struct ima_template_data { | |
45 | u8 digest[IMA_DIGEST_SIZE]; /* sha1/md5 measurement hash */ | |
46 | char file_name[IMA_EVENT_NAME_LEN_MAX + 1]; /* name + \0 */ | |
47 | }; | |
48 | ||
49 | struct ima_template_entry { | |
50 | u8 digest[IMA_DIGEST_SIZE]; /* sha1 or md5 measurement hash */ | |
523979ad | 51 | const char *template_name; |
3323eec9 MZ |
52 | int template_len; |
53 | struct ima_template_data template; | |
54 | }; | |
55 | ||
56 | struct ima_queue_entry { | |
57 | struct hlist_node hnext; /* place in hash collision list */ | |
58 | struct list_head later; /* place in ima_measurements list */ | |
59 | struct ima_template_entry *entry; | |
60 | }; | |
61 | extern struct list_head ima_measurements; /* list of all measurements */ | |
62 | ||
63 | /* declarations */ | |
64 | void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
65 | const unsigned char *fname, const char *op, | |
66 | const char *cause, int result, int info); | |
67 | ||
68 | /* Internal IMA function definitions */ | |
3323eec9 | 69 | int ima_init(void); |
bab73937 MZ |
70 | void ima_cleanup(void); |
71 | int ima_fs_init(void); | |
72 | void ima_fs_cleanup(void); | |
3323eec9 MZ |
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 */ | |
15aac676 | 99 | #define IMA_MEASURED 0x01 |
3323eec9 MZ |
100 | |
101 | /* integrity data associated with an inode */ | |
102 | struct ima_iint_cache { | |
85491641 EP |
103 | struct rb_node rb_node; /* rooted in ima_iint_tree */ |
104 | struct inode *inode; /* back pointer to inode in question */ | |
3323eec9 | 105 | u64 version; /* track inode changes */ |
15aac676 | 106 | unsigned char flags; |
3323eec9 MZ |
107 | u8 digest[IMA_DIGEST_SIZE]; |
108 | struct mutex mutex; /* protects: version, flags, digest */ | |
ad16ad00 | 109 | /* protected by inode->i_lock */ |
497f3233 EP |
110 | unsigned int readcount; /* measured files readcount */ |
111 | unsigned int writecount;/* measured files writecount */ | |
3323eec9 | 112 | struct kref refcount; /* ima_iint_cache reference count */ |
3323eec9 MZ |
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); | |
bab73937 MZ |
123 | void ima_template_show(struct seq_file *m, void *e, |
124 | enum ima_show_type show); | |
3323eec9 | 125 | |
85491641 | 126 | /* rbtree tree calls to lookup, insert, delete |
3323eec9 MZ |
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); | |
3323eec9 | 131 | void iint_free(struct kref *kref); |
3323eec9 MZ |
132 | |
133 | /* IMA policy related functions */ | |
1e93d005 | 134 | enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK }; |
3323eec9 MZ |
135 | |
136 | int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask); | |
137 | void ima_init_policy(void); | |
138 | void ima_update_policy(void); | |
6ccd0456 | 139 | ssize_t ima_parse_add_rule(char *); |
4af4662f MZ |
140 | void ima_delete_rules(void); |
141 | ||
142 | /* LSM based policy rules require audit */ | |
143 | #ifdef CONFIG_IMA_LSM_RULES | |
144 | ||
145 | #define security_filter_rule_init security_audit_rule_init | |
146 | #define security_filter_rule_match security_audit_rule_match | |
147 | ||
148 | #else | |
149 | ||
150 | static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, | |
151 | void **lsmrule) | |
152 | { | |
153 | return -EINVAL; | |
154 | } | |
155 | ||
156 | static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, | |
157 | void *lsmrule, | |
158 | struct audit_context *actx) | |
159 | { | |
160 | return -EINVAL; | |
161 | } | |
162 | #endif /* CONFIG_IMA_LSM_RULES */ | |
3323eec9 | 163 | #endif |