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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 | |
45e2472e | 33 | |
d79d72e0 MZ |
34 | #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ |
35 | IMA_APPRAISE_SUBMASK) | |
36 | #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ | |
37 | IMA_COLLECTED | IMA_APPRAISED_SUBMASK) | |
38 | ||
39 | /* iint subaction appraise cache flags */ | |
40 | #define IMA_FILE_APPRAISE 0x00000100 | |
41 | #define IMA_FILE_APPRAISED 0x00000200 | |
42 | #define IMA_MMAP_APPRAISE 0x00000400 | |
43 | #define IMA_MMAP_APPRAISED 0x00000800 | |
44 | #define IMA_BPRM_APPRAISE 0x00001000 | |
45 | #define IMA_BPRM_APPRAISED 0x00002000 | |
46 | #define IMA_MODULE_APPRAISE 0x00004000 | |
47 | #define IMA_MODULE_APPRAISED 0x00008000 | |
48 | #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ | |
49 | IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE) | |
50 | #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ | |
51 | IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED) | |
f381c272 | 52 | |
6be5cc52 DK |
53 | enum evm_ima_xattr_type { |
54 | IMA_XATTR_DIGEST = 0x01, | |
55 | EVM_XATTR_HMAC, | |
56 | EVM_IMA_XATTR_DIGSIG, | |
3ea7a560 | 57 | IMA_XATTR_DIGEST_NG, |
6be5cc52 DK |
58 | }; |
59 | ||
60 | struct evm_ima_xattr_data { | |
61 | u8 type; | |
62 | u8 digest[SHA1_DIGEST_SIZE]; | |
c7c8bb23 DK |
63 | } __packed; |
64 | ||
65 | #define IMA_MAX_DIGEST_SIZE 64 | |
66 | ||
67 | struct ima_digest_data { | |
68 | u8 algo; | |
69 | u8 length; | |
3ea7a560 DK |
70 | union { |
71 | struct { | |
72 | u8 unused; | |
73 | u8 type; | |
74 | } sha1; | |
75 | struct { | |
76 | u8 type; | |
77 | u8 algo; | |
78 | } ng; | |
79 | u8 data[2]; | |
80 | } xattr; | |
a35c3fb6 | 81 | u8 digest[0]; |
c7c8bb23 | 82 | } __packed; |
6be5cc52 | 83 | |
d3634d0f DK |
84 | /* |
85 | * signature format v2 - for using with asymmetric keys | |
86 | */ | |
87 | struct signature_v2_hdr { | |
b1aaab22 | 88 | uint8_t type; /* xattr type */ |
d3634d0f DK |
89 | uint8_t version; /* signature format version */ |
90 | uint8_t hash_algo; /* Digest algorithm [enum pkey_hash_algo] */ | |
91 | uint32_t keyid; /* IMA key identifier - not X509/PGP specific */ | |
92 | uint16_t sig_size; /* signature size */ | |
93 | uint8_t sig[0]; /* signature payload */ | |
94 | } __packed; | |
95 | ||
f381c272 MZ |
96 | /* integrity data associated with an inode */ |
97 | struct integrity_iint_cache { | |
c7c8bb23 | 98 | struct rb_node rb_node; /* rooted in integrity_iint_tree */ |
f381c272 MZ |
99 | struct inode *inode; /* back pointer to inode in question */ |
100 | u64 version; /* track inode changes */ | |
f578c08e | 101 | unsigned long flags; |
d79d72e0 MZ |
102 | enum integrity_status ima_file_status:4; |
103 | enum integrity_status ima_mmap_status:4; | |
104 | enum integrity_status ima_bprm_status:4; | |
105 | enum integrity_status ima_module_status:4; | |
ee866331 | 106 | enum integrity_status evm_status:4; |
a35c3fb6 | 107 | struct ima_digest_data *ima_hash; |
f381c272 MZ |
108 | }; |
109 | ||
110 | /* rbtree tree calls to lookup, insert, delete | |
111 | * integrity data associated with an inode. | |
112 | */ | |
113 | struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); | |
114 | struct integrity_iint_cache *integrity_iint_find(struct inode *inode); | |
4892722e | 115 | |
8607c501 DK |
116 | #define INTEGRITY_KEYRING_EVM 0 |
117 | #define INTEGRITY_KEYRING_MODULE 1 | |
118 | #define INTEGRITY_KEYRING_IMA 2 | |
119 | #define INTEGRITY_KEYRING_MAX 3 | |
120 | ||
f1be242c | 121 | #ifdef CONFIG_INTEGRITY_SIGNATURE |
8607c501 DK |
122 | |
123 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, | |
089bc8e9 | 124 | const char *digest, int digestlen); |
8607c501 DK |
125 | |
126 | #else | |
127 | ||
128 | static inline int integrity_digsig_verify(const unsigned int id, | |
129 | const char *sig, int siglen, | |
130 | const char *digest, int digestlen) | |
131 | { | |
132 | return -EOPNOTSUPP; | |
133 | } | |
134 | ||
f1be242c | 135 | #endif /* CONFIG_INTEGRITY_SIGNATURE */ |
8607c501 | 136 | |
e0751257 DK |
137 | #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS |
138 | int asymmetric_verify(struct key *keyring, const char *sig, | |
139 | int siglen, const char *data, int datalen); | |
140 | #else | |
141 | static inline int asymmetric_verify(struct key *keyring, const char *sig, | |
142 | int siglen, const char *data, int datalen) | |
143 | { | |
144 | return -EOPNOTSUPP; | |
145 | } | |
146 | #endif | |
147 | ||
d726d8d7 MZ |
148 | #ifdef CONFIG_INTEGRITY_AUDIT |
149 | /* declarations */ | |
150 | void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
151 | const unsigned char *fname, const char *op, | |
152 | const char *cause, int result, int info); | |
153 | #else | |
154 | static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
155 | const unsigned char *fname, | |
156 | const char *op, const char *cause, | |
157 | int result, int info) | |
158 | { | |
159 | } | |
160 | #endif | |
161 | ||
4892722e JM |
162 | /* set during initialization */ |
163 | extern int iint_initialized; |