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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 |
b151d6b0 | 34 | #define IMA_NEW_FILE 0x08000000 |
45e2472e | 35 | |
d79d72e0 MZ |
36 | #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ |
37 | IMA_APPRAISE_SUBMASK) | |
38 | #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ | |
39 | IMA_COLLECTED | IMA_APPRAISED_SUBMASK) | |
40 | ||
41 | /* iint subaction appraise cache flags */ | |
42 | #define IMA_FILE_APPRAISE 0x00000100 | |
43 | #define IMA_FILE_APPRAISED 0x00000200 | |
44 | #define IMA_MMAP_APPRAISE 0x00000400 | |
45 | #define IMA_MMAP_APPRAISED 0x00000800 | |
46 | #define IMA_BPRM_APPRAISE 0x00001000 | |
47 | #define IMA_BPRM_APPRAISED 0x00002000 | |
c6af8efe MZ |
48 | #define IMA_READ_APPRAISE 0x00004000 |
49 | #define IMA_READ_APPRAISED 0x00008000 | |
d79d72e0 | 50 | #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ |
c6af8efe | 51 | IMA_BPRM_APPRAISE | IMA_READ_APPRAISE) |
d79d72e0 | 52 | #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ |
c6af8efe | 53 | IMA_BPRM_APPRAISED | IMA_READ_APPRAISED) |
f381c272 | 54 | |
6be5cc52 DK |
55 | enum evm_ima_xattr_type { |
56 | IMA_XATTR_DIGEST = 0x01, | |
57 | EVM_XATTR_HMAC, | |
58 | EVM_IMA_XATTR_DIGSIG, | |
3ea7a560 | 59 | IMA_XATTR_DIGEST_NG, |
a48fda9d | 60 | IMA_XATTR_LAST |
6be5cc52 DK |
61 | }; |
62 | ||
63 | struct evm_ima_xattr_data { | |
64 | u8 type; | |
65 | u8 digest[SHA1_DIGEST_SIZE]; | |
c7c8bb23 DK |
66 | } __packed; |
67 | ||
68 | #define IMA_MAX_DIGEST_SIZE 64 | |
69 | ||
70 | struct ima_digest_data { | |
71 | u8 algo; | |
72 | u8 length; | |
3ea7a560 DK |
73 | union { |
74 | struct { | |
75 | u8 unused; | |
76 | u8 type; | |
77 | } sha1; | |
78 | struct { | |
79 | u8 type; | |
80 | u8 algo; | |
81 | } ng; | |
82 | u8 data[2]; | |
83 | } xattr; | |
a35c3fb6 | 84 | u8 digest[0]; |
c7c8bb23 | 85 | } __packed; |
6be5cc52 | 86 | |
d3634d0f DK |
87 | /* |
88 | * signature format v2 - for using with asymmetric keys | |
89 | */ | |
90 | struct signature_v2_hdr { | |
b1aaab22 | 91 | uint8_t type; /* xattr type */ |
d3634d0f | 92 | uint8_t version; /* signature format version */ |
4e8ae72a | 93 | uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */ |
d3634d0f DK |
94 | uint32_t keyid; /* IMA key identifier - not X509/PGP specific */ |
95 | uint16_t sig_size; /* signature size */ | |
96 | uint8_t sig[0]; /* signature payload */ | |
97 | } __packed; | |
98 | ||
f381c272 MZ |
99 | /* integrity data associated with an inode */ |
100 | struct integrity_iint_cache { | |
c7c8bb23 | 101 | struct rb_node rb_node; /* rooted in integrity_iint_tree */ |
f381c272 MZ |
102 | struct inode *inode; /* back pointer to inode in question */ |
103 | u64 version; /* track inode changes */ | |
f578c08e | 104 | unsigned long flags; |
d79d72e0 MZ |
105 | enum integrity_status ima_file_status:4; |
106 | enum integrity_status ima_mmap_status:4; | |
107 | enum integrity_status ima_bprm_status:4; | |
cf222217 | 108 | enum integrity_status ima_read_status:4; |
ee866331 | 109 | enum integrity_status evm_status:4; |
a35c3fb6 | 110 | struct ima_digest_data *ima_hash; |
f381c272 MZ |
111 | }; |
112 | ||
113 | /* rbtree tree calls to lookup, insert, delete | |
114 | * integrity data associated with an inode. | |
115 | */ | |
f381c272 | 116 | struct integrity_iint_cache *integrity_iint_find(struct inode *inode); |
4892722e | 117 | |
e3c4abbf DK |
118 | int integrity_kernel_read(struct file *file, loff_t offset, |
119 | char *addr, unsigned long count); | |
120 | int __init integrity_read_file(const char *path, char **data); | |
121 | ||
8607c501 | 122 | #define INTEGRITY_KEYRING_EVM 0 |
f4dc3778 DK |
123 | #define INTEGRITY_KEYRING_IMA 1 |
124 | #define INTEGRITY_KEYRING_MODULE 2 | |
8607c501 DK |
125 | #define INTEGRITY_KEYRING_MAX 3 |
126 | ||
f1be242c | 127 | #ifdef CONFIG_INTEGRITY_SIGNATURE |
8607c501 DK |
128 | |
129 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, | |
089bc8e9 | 130 | const char *digest, int digestlen); |
8607c501 | 131 | |
d16a8585 | 132 | int __init integrity_init_keyring(const unsigned int id); |
9d03a721 | 133 | int __init integrity_load_x509(const unsigned int id, const char *path); |
8607c501 DK |
134 | #else |
135 | ||
136 | static inline int integrity_digsig_verify(const unsigned int id, | |
137 | const char *sig, int siglen, | |
138 | const char *digest, int digestlen) | |
139 | { | |
140 | return -EOPNOTSUPP; | |
141 | } | |
142 | ||
7d2ce232 MZ |
143 | static inline int integrity_init_keyring(const unsigned int id) |
144 | { | |
145 | return 0; | |
146 | } | |
f1be242c | 147 | #endif /* CONFIG_INTEGRITY_SIGNATURE */ |
8607c501 | 148 | |
e0751257 DK |
149 | #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS |
150 | int asymmetric_verify(struct key *keyring, const char *sig, | |
151 | int siglen, const char *data, int datalen); | |
152 | #else | |
153 | static inline int asymmetric_verify(struct key *keyring, const char *sig, | |
154 | int siglen, const char *data, int datalen) | |
155 | { | |
156 | return -EOPNOTSUPP; | |
157 | } | |
158 | #endif | |
159 | ||
fd5f4e90 DK |
160 | #ifdef CONFIG_IMA_LOAD_X509 |
161 | void __init ima_load_x509(void); | |
162 | #else | |
163 | static inline void ima_load_x509(void) | |
164 | { | |
165 | } | |
166 | #endif | |
167 | ||
2ce523eb DK |
168 | #ifdef CONFIG_EVM_LOAD_X509 |
169 | void __init evm_load_x509(void); | |
170 | #else | |
171 | static inline void evm_load_x509(void) | |
172 | { | |
173 | } | |
174 | #endif | |
175 | ||
d726d8d7 MZ |
176 | #ifdef CONFIG_INTEGRITY_AUDIT |
177 | /* declarations */ | |
178 | void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
179 | const unsigned char *fname, const char *op, | |
180 | const char *cause, int result, int info); | |
181 | #else | |
182 | static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
183 | const unsigned char *fname, | |
184 | const char *op, const char *cause, | |
185 | int result, int info) | |
186 | { | |
187 | } | |
188 | #endif |