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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 | 30 | #define IMA_ACTION_FLAGS 0xff000000 |
42a4c603 | 31 | #define IMA_ACTION_RULE_FLAGS 0x06000000 |
f578c08e MZ |
32 | #define IMA_DIGSIG 0x01000000 |
33 | #define IMA_DIGSIG_REQUIRED 0x02000000 | |
f9b2a735 | 34 | #define IMA_PERMIT_DIRECTIO 0x04000000 |
b151d6b0 | 35 | #define IMA_NEW_FILE 0x08000000 |
45e2472e | 36 | |
d79d72e0 MZ |
37 | #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ |
38 | IMA_APPRAISE_SUBMASK) | |
39 | #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ | |
40 | IMA_COLLECTED | IMA_APPRAISED_SUBMASK) | |
41 | ||
42 | /* iint subaction appraise cache flags */ | |
43 | #define IMA_FILE_APPRAISE 0x00000100 | |
44 | #define IMA_FILE_APPRAISED 0x00000200 | |
45 | #define IMA_MMAP_APPRAISE 0x00000400 | |
46 | #define IMA_MMAP_APPRAISED 0x00000800 | |
47 | #define IMA_BPRM_APPRAISE 0x00001000 | |
48 | #define IMA_BPRM_APPRAISED 0x00002000 | |
c6af8efe MZ |
49 | #define IMA_READ_APPRAISE 0x00004000 |
50 | #define IMA_READ_APPRAISED 0x00008000 | |
d79d72e0 | 51 | #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ |
c6af8efe | 52 | IMA_BPRM_APPRAISE | IMA_READ_APPRAISE) |
d79d72e0 | 53 | #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ |
c6af8efe | 54 | IMA_BPRM_APPRAISED | IMA_READ_APPRAISED) |
f381c272 | 55 | |
6be5cc52 DK |
56 | enum evm_ima_xattr_type { |
57 | IMA_XATTR_DIGEST = 0x01, | |
58 | EVM_XATTR_HMAC, | |
59 | EVM_IMA_XATTR_DIGSIG, | |
3ea7a560 | 60 | IMA_XATTR_DIGEST_NG, |
a48fda9d | 61 | IMA_XATTR_LAST |
6be5cc52 DK |
62 | }; |
63 | ||
64 | struct evm_ima_xattr_data { | |
65 | u8 type; | |
66 | u8 digest[SHA1_DIGEST_SIZE]; | |
c7c8bb23 DK |
67 | } __packed; |
68 | ||
69 | #define IMA_MAX_DIGEST_SIZE 64 | |
70 | ||
71 | struct ima_digest_data { | |
72 | u8 algo; | |
73 | u8 length; | |
3ea7a560 DK |
74 | union { |
75 | struct { | |
76 | u8 unused; | |
77 | u8 type; | |
78 | } sha1; | |
79 | struct { | |
80 | u8 type; | |
81 | u8 algo; | |
82 | } ng; | |
83 | u8 data[2]; | |
84 | } xattr; | |
a35c3fb6 | 85 | u8 digest[0]; |
c7c8bb23 | 86 | } __packed; |
6be5cc52 | 87 | |
d3634d0f DK |
88 | /* |
89 | * signature format v2 - for using with asymmetric keys | |
90 | */ | |
91 | struct signature_v2_hdr { | |
b1aaab22 | 92 | uint8_t type; /* xattr type */ |
d3634d0f | 93 | uint8_t version; /* signature format version */ |
4e8ae72a | 94 | uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */ |
d3634d0f DK |
95 | uint32_t keyid; /* IMA key identifier - not X509/PGP specific */ |
96 | uint16_t sig_size; /* signature size */ | |
97 | uint8_t sig[0]; /* signature payload */ | |
98 | } __packed; | |
99 | ||
f381c272 MZ |
100 | /* integrity data associated with an inode */ |
101 | struct integrity_iint_cache { | |
c7c8bb23 | 102 | struct rb_node rb_node; /* rooted in integrity_iint_tree */ |
f381c272 MZ |
103 | struct inode *inode; /* back pointer to inode in question */ |
104 | u64 version; /* track inode changes */ | |
f578c08e | 105 | unsigned long flags; |
96d450bb | 106 | unsigned long measured_pcrs; |
d79d72e0 MZ |
107 | enum integrity_status ima_file_status:4; |
108 | enum integrity_status ima_mmap_status:4; | |
109 | enum integrity_status ima_bprm_status:4; | |
cf222217 | 110 | enum integrity_status ima_read_status:4; |
ee866331 | 111 | enum integrity_status evm_status:4; |
a35c3fb6 | 112 | struct ima_digest_data *ima_hash; |
f381c272 MZ |
113 | }; |
114 | ||
115 | /* rbtree tree calls to lookup, insert, delete | |
116 | * integrity data associated with an inode. | |
117 | */ | |
f381c272 | 118 | struct integrity_iint_cache *integrity_iint_find(struct inode *inode); |
4892722e | 119 | |
e3c4abbf DK |
120 | int integrity_kernel_read(struct file *file, loff_t offset, |
121 | char *addr, unsigned long count); | |
122 | int __init integrity_read_file(const char *path, char **data); | |
123 | ||
8607c501 | 124 | #define INTEGRITY_KEYRING_EVM 0 |
f4dc3778 DK |
125 | #define INTEGRITY_KEYRING_IMA 1 |
126 | #define INTEGRITY_KEYRING_MODULE 2 | |
8607c501 DK |
127 | #define INTEGRITY_KEYRING_MAX 3 |
128 | ||
f1be242c | 129 | #ifdef CONFIG_INTEGRITY_SIGNATURE |
8607c501 DK |
130 | |
131 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, | |
089bc8e9 | 132 | const char *digest, int digestlen); |
8607c501 | 133 | |
d16a8585 | 134 | int __init integrity_init_keyring(const unsigned int id); |
9d03a721 | 135 | int __init integrity_load_x509(const unsigned int id, const char *path); |
8607c501 DK |
136 | #else |
137 | ||
138 | static inline int integrity_digsig_verify(const unsigned int id, | |
139 | const char *sig, int siglen, | |
140 | const char *digest, int digestlen) | |
141 | { | |
142 | return -EOPNOTSUPP; | |
143 | } | |
144 | ||
7d2ce232 MZ |
145 | static inline int integrity_init_keyring(const unsigned int id) |
146 | { | |
147 | return 0; | |
148 | } | |
f1be242c | 149 | #endif /* CONFIG_INTEGRITY_SIGNATURE */ |
8607c501 | 150 | |
e0751257 DK |
151 | #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS |
152 | int asymmetric_verify(struct key *keyring, const char *sig, | |
153 | int siglen, const char *data, int datalen); | |
154 | #else | |
155 | static inline int asymmetric_verify(struct key *keyring, const char *sig, | |
156 | int siglen, const char *data, int datalen) | |
157 | { | |
158 | return -EOPNOTSUPP; | |
159 | } | |
160 | #endif | |
161 | ||
fd5f4e90 DK |
162 | #ifdef CONFIG_IMA_LOAD_X509 |
163 | void __init ima_load_x509(void); | |
164 | #else | |
165 | static inline void ima_load_x509(void) | |
166 | { | |
167 | } | |
168 | #endif | |
169 | ||
2ce523eb DK |
170 | #ifdef CONFIG_EVM_LOAD_X509 |
171 | void __init evm_load_x509(void); | |
172 | #else | |
173 | static inline void evm_load_x509(void) | |
174 | { | |
175 | } | |
176 | #endif | |
177 | ||
d726d8d7 MZ |
178 | #ifdef CONFIG_INTEGRITY_AUDIT |
179 | /* declarations */ | |
180 | void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
181 | const unsigned char *fname, const char *op, | |
182 | const char *cause, int result, int info); | |
183 | #else | |
184 | static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
185 | const unsigned char *fname, | |
186 | const char *op, const char *cause, | |
187 | int result, int info) | |
188 | { | |
189 | } | |
190 | #endif |