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f381c272 MZ |
1 | /* |
2 | * Copyright (C) 2009-2010 IBM Corporation | |
3 | * | |
4 | * Authors: | |
5 | * Mimi Zohar <zohar@us.ibm.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License as | |
9 | * published by the Free Software Foundation, version 2 of the | |
10 | * License. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/types.h> | |
15 | #include <linux/integrity.h> | |
16 | #include <crypto/sha.h> | |
e0751257 | 17 | #include <linux/key.h> |
f381c272 | 18 | |
45e2472e | 19 | /* iint action cache flags */ |
f578c08e MZ |
20 | #define IMA_MEASURE 0x00000001 |
21 | #define IMA_MEASURED 0x00000002 | |
22 | #define IMA_APPRAISE 0x00000004 | |
23 | #define IMA_APPRAISED 0x00000008 | |
24 | /*#define IMA_COLLECT 0x00000010 do not use this flag */ | |
25 | #define IMA_COLLECTED 0x00000020 | |
26 | #define IMA_AUDIT 0x00000040 | |
27 | #define IMA_AUDITED 0x00000080 | |
45e2472e | 28 | |
f381c272 | 29 | /* iint cache flags */ |
f578c08e MZ |
30 | #define IMA_ACTION_FLAGS 0xff000000 |
31 | #define IMA_DIGSIG 0x01000000 | |
32 | #define IMA_DIGSIG_REQUIRED 0x02000000 | |
f9b2a735 | 33 | #define IMA_PERMIT_DIRECTIO 0x04000000 |
45e2472e | 34 | |
d79d72e0 MZ |
35 | #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ |
36 | IMA_APPRAISE_SUBMASK) | |
37 | #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ | |
38 | IMA_COLLECTED | IMA_APPRAISED_SUBMASK) | |
39 | ||
40 | /* iint subaction appraise cache flags */ | |
41 | #define IMA_FILE_APPRAISE 0x00000100 | |
42 | #define IMA_FILE_APPRAISED 0x00000200 | |
43 | #define IMA_MMAP_APPRAISE 0x00000400 | |
44 | #define IMA_MMAP_APPRAISED 0x00000800 | |
45 | #define IMA_BPRM_APPRAISE 0x00001000 | |
46 | #define IMA_BPRM_APPRAISED 0x00002000 | |
47 | #define IMA_MODULE_APPRAISE 0x00004000 | |
48 | #define IMA_MODULE_APPRAISED 0x00008000 | |
49 | #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ | |
50 | IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE) | |
51 | #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ | |
52 | IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED) | |
f381c272 | 53 | |
6be5cc52 DK |
54 | enum evm_ima_xattr_type { |
55 | IMA_XATTR_DIGEST = 0x01, | |
56 | EVM_XATTR_HMAC, | |
57 | EVM_IMA_XATTR_DIGSIG, | |
3ea7a560 | 58 | IMA_XATTR_DIGEST_NG, |
6be5cc52 DK |
59 | }; |
60 | ||
61 | struct evm_ima_xattr_data { | |
62 | u8 type; | |
63 | u8 digest[SHA1_DIGEST_SIZE]; | |
c7c8bb23 DK |
64 | } __packed; |
65 | ||
66 | #define IMA_MAX_DIGEST_SIZE 64 | |
67 | ||
68 | struct ima_digest_data { | |
69 | u8 algo; | |
70 | u8 length; | |
3ea7a560 DK |
71 | union { |
72 | struct { | |
73 | u8 unused; | |
74 | u8 type; | |
75 | } sha1; | |
76 | struct { | |
77 | u8 type; | |
78 | u8 algo; | |
79 | } ng; | |
80 | u8 data[2]; | |
81 | } xattr; | |
a35c3fb6 | 82 | u8 digest[0]; |
c7c8bb23 | 83 | } __packed; |
6be5cc52 | 84 | |
d3634d0f DK |
85 | /* |
86 | * signature format v2 - for using with asymmetric keys | |
87 | */ | |
88 | struct signature_v2_hdr { | |
b1aaab22 | 89 | uint8_t type; /* xattr type */ |
d3634d0f DK |
90 | uint8_t version; /* signature format version */ |
91 | uint8_t hash_algo; /* Digest algorithm [enum pkey_hash_algo] */ | |
92 | uint32_t keyid; /* IMA key identifier - not X509/PGP specific */ | |
93 | uint16_t sig_size; /* signature size */ | |
94 | uint8_t sig[0]; /* signature payload */ | |
95 | } __packed; | |
96 | ||
f381c272 MZ |
97 | /* integrity data associated with an inode */ |
98 | struct integrity_iint_cache { | |
c7c8bb23 | 99 | struct rb_node rb_node; /* rooted in integrity_iint_tree */ |
f381c272 MZ |
100 | struct inode *inode; /* back pointer to inode in question */ |
101 | u64 version; /* track inode changes */ | |
f578c08e | 102 | unsigned long flags; |
d79d72e0 MZ |
103 | enum integrity_status ima_file_status:4; |
104 | enum integrity_status ima_mmap_status:4; | |
105 | enum integrity_status ima_bprm_status:4; | |
106 | enum integrity_status ima_module_status:4; | |
ee866331 | 107 | enum integrity_status evm_status:4; |
a35c3fb6 | 108 | struct ima_digest_data *ima_hash; |
f381c272 MZ |
109 | }; |
110 | ||
111 | /* rbtree tree calls to lookup, insert, delete | |
112 | * integrity data associated with an inode. | |
113 | */ | |
114 | struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); | |
115 | struct integrity_iint_cache *integrity_iint_find(struct inode *inode); | |
4892722e | 116 | |
8607c501 DK |
117 | #define INTEGRITY_KEYRING_EVM 0 |
118 | #define INTEGRITY_KEYRING_MODULE 1 | |
119 | #define INTEGRITY_KEYRING_IMA 2 | |
120 | #define INTEGRITY_KEYRING_MAX 3 | |
121 | ||
f1be242c | 122 | #ifdef CONFIG_INTEGRITY_SIGNATURE |
8607c501 DK |
123 | |
124 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, | |
089bc8e9 | 125 | const char *digest, int digestlen); |
8607c501 DK |
126 | |
127 | #else | |
128 | ||
129 | static inline int integrity_digsig_verify(const unsigned int id, | |
130 | const char *sig, int siglen, | |
131 | const char *digest, int digestlen) | |
132 | { | |
133 | return -EOPNOTSUPP; | |
134 | } | |
135 | ||
f1be242c | 136 | #endif /* CONFIG_INTEGRITY_SIGNATURE */ |
8607c501 | 137 | |
e0751257 DK |
138 | #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS |
139 | int asymmetric_verify(struct key *keyring, const char *sig, | |
140 | int siglen, const char *data, int datalen); | |
141 | #else | |
142 | static inline int asymmetric_verify(struct key *keyring, const char *sig, | |
143 | int siglen, const char *data, int datalen) | |
144 | { | |
145 | return -EOPNOTSUPP; | |
146 | } | |
147 | #endif | |
148 | ||
d726d8d7 MZ |
149 | #ifdef CONFIG_INTEGRITY_AUDIT |
150 | /* declarations */ | |
151 | void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
152 | const unsigned char *fname, const char *op, | |
153 | const char *cause, int result, int info); | |
154 | #else | |
155 | static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
156 | const unsigned char *fname, | |
157 | const char *op, const char *cause, | |
158 | int result, int info) | |
159 | { | |
160 | } | |
161 | #endif | |
162 | ||
4892722e JM |
163 | /* set during initialization */ |
164 | extern int iint_initialized; |