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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 | |
da1b0029 MZ |
28 | #define IMA_HASH 0x00000100 |
29 | #define IMA_HASHED 0x00000200 | |
45e2472e | 30 | |
f381c272 | 31 | /* iint cache flags */ |
f578c08e | 32 | #define IMA_ACTION_FLAGS 0xff000000 |
42a4c603 | 33 | #define IMA_ACTION_RULE_FLAGS 0x06000000 |
0d73a552 DK |
34 | #define IMA_DIGSIG_REQUIRED 0x01000000 |
35 | #define IMA_PERMIT_DIRECTIO 0x02000000 | |
36 | #define IMA_NEW_FILE 0x04000000 | |
37 | #define EVM_IMMUTABLE_DIGSIG 0x08000000 | |
45e2472e | 38 | |
d79d72e0 | 39 | #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ |
da1b0029 | 40 | IMA_HASH | IMA_APPRAISE_SUBMASK) |
d79d72e0 | 41 | #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ |
da1b0029 MZ |
42 | IMA_HASHED | IMA_COLLECTED | \ |
43 | IMA_APPRAISED_SUBMASK) | |
d79d72e0 MZ |
44 | |
45 | /* iint subaction appraise cache flags */ | |
da1b0029 MZ |
46 | #define IMA_FILE_APPRAISE 0x00001000 |
47 | #define IMA_FILE_APPRAISED 0x00002000 | |
48 | #define IMA_MMAP_APPRAISE 0x00004000 | |
49 | #define IMA_MMAP_APPRAISED 0x00008000 | |
50 | #define IMA_BPRM_APPRAISE 0x00010000 | |
51 | #define IMA_BPRM_APPRAISED 0x00020000 | |
52 | #define IMA_READ_APPRAISE 0x00040000 | |
53 | #define IMA_READ_APPRAISED 0x00080000 | |
d79d72e0 | 54 | #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ |
c6af8efe | 55 | IMA_BPRM_APPRAISE | IMA_READ_APPRAISE) |
d79d72e0 | 56 | #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ |
c6af8efe | 57 | IMA_BPRM_APPRAISED | IMA_READ_APPRAISED) |
f381c272 | 58 | |
0d73a552 DK |
59 | /* iint cache atomic_flags */ |
60 | #define IMA_CHANGE_XATTR 0 | |
61 | #define IMA_UPDATE_XATTR 1 | |
62 | #define IMA_CHANGE_ATTR 2 | |
63 | #define IMA_DIGSIG 3 | |
64 | #define IMA_MUST_MEASURE 4 | |
65 | ||
6be5cc52 DK |
66 | enum evm_ima_xattr_type { |
67 | IMA_XATTR_DIGEST = 0x01, | |
68 | EVM_XATTR_HMAC, | |
69 | EVM_IMA_XATTR_DIGSIG, | |
3ea7a560 | 70 | IMA_XATTR_DIGEST_NG, |
50b97748 | 71 | EVM_XATTR_PORTABLE_DIGSIG, |
a48fda9d | 72 | IMA_XATTR_LAST |
6be5cc52 DK |
73 | }; |
74 | ||
75 | struct evm_ima_xattr_data { | |
76 | u8 type; | |
77 | u8 digest[SHA1_DIGEST_SIZE]; | |
c7c8bb23 DK |
78 | } __packed; |
79 | ||
80 | #define IMA_MAX_DIGEST_SIZE 64 | |
81 | ||
82 | struct ima_digest_data { | |
83 | u8 algo; | |
84 | u8 length; | |
3ea7a560 DK |
85 | union { |
86 | struct { | |
87 | u8 unused; | |
88 | u8 type; | |
89 | } sha1; | |
90 | struct { | |
91 | u8 type; | |
92 | u8 algo; | |
93 | } ng; | |
94 | u8 data[2]; | |
95 | } xattr; | |
a35c3fb6 | 96 | u8 digest[0]; |
c7c8bb23 | 97 | } __packed; |
6be5cc52 | 98 | |
d3634d0f DK |
99 | /* |
100 | * signature format v2 - for using with asymmetric keys | |
101 | */ | |
102 | struct signature_v2_hdr { | |
b1aaab22 | 103 | uint8_t type; /* xattr type */ |
d3634d0f | 104 | uint8_t version; /* signature format version */ |
4e8ae72a | 105 | uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */ |
bb543e39 TJB |
106 | __be32 keyid; /* IMA key identifier - not X509/PGP specific */ |
107 | __be16 sig_size; /* signature size */ | |
d3634d0f DK |
108 | uint8_t sig[0]; /* signature payload */ |
109 | } __packed; | |
110 | ||
f381c272 MZ |
111 | /* integrity data associated with an inode */ |
112 | struct integrity_iint_cache { | |
c7c8bb23 | 113 | struct rb_node rb_node; /* rooted in integrity_iint_tree */ |
0d73a552 | 114 | struct mutex mutex; /* protects: version, flags, digest */ |
f381c272 MZ |
115 | struct inode *inode; /* back pointer to inode in question */ |
116 | u64 version; /* track inode changes */ | |
f578c08e | 117 | unsigned long flags; |
96d450bb | 118 | unsigned long measured_pcrs; |
0d73a552 | 119 | unsigned long atomic_flags; |
d79d72e0 MZ |
120 | enum integrity_status ima_file_status:4; |
121 | enum integrity_status ima_mmap_status:4; | |
122 | enum integrity_status ima_bprm_status:4; | |
cf222217 | 123 | enum integrity_status ima_read_status:4; |
ee866331 | 124 | enum integrity_status evm_status:4; |
a35c3fb6 | 125 | struct ima_digest_data *ima_hash; |
f381c272 MZ |
126 | }; |
127 | ||
128 | /* rbtree tree calls to lookup, insert, delete | |
129 | * integrity data associated with an inode. | |
130 | */ | |
f381c272 | 131 | struct integrity_iint_cache *integrity_iint_find(struct inode *inode); |
4892722e | 132 | |
e3c4abbf | 133 | int integrity_kernel_read(struct file *file, loff_t offset, |
bb543e39 TJB |
134 | void *addr, unsigned long count); |
135 | ||
8607c501 | 136 | #define INTEGRITY_KEYRING_EVM 0 |
f4dc3778 DK |
137 | #define INTEGRITY_KEYRING_IMA 1 |
138 | #define INTEGRITY_KEYRING_MODULE 2 | |
8607c501 DK |
139 | #define INTEGRITY_KEYRING_MAX 3 |
140 | ||
f1be242c | 141 | #ifdef CONFIG_INTEGRITY_SIGNATURE |
8607c501 DK |
142 | |
143 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, | |
089bc8e9 | 144 | const char *digest, int digestlen); |
8607c501 | 145 | |
d16a8585 | 146 | int __init integrity_init_keyring(const unsigned int id); |
9d03a721 | 147 | int __init integrity_load_x509(const unsigned int id, const char *path); |
8607c501 DK |
148 | #else |
149 | ||
150 | static inline int integrity_digsig_verify(const unsigned int id, | |
151 | const char *sig, int siglen, | |
152 | const char *digest, int digestlen) | |
153 | { | |
154 | return -EOPNOTSUPP; | |
155 | } | |
156 | ||
7d2ce232 MZ |
157 | static inline int integrity_init_keyring(const unsigned int id) |
158 | { | |
159 | return 0; | |
160 | } | |
f1be242c | 161 | #endif /* CONFIG_INTEGRITY_SIGNATURE */ |
8607c501 | 162 | |
e0751257 DK |
163 | #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS |
164 | int asymmetric_verify(struct key *keyring, const char *sig, | |
165 | int siglen, const char *data, int datalen); | |
166 | #else | |
167 | static inline int asymmetric_verify(struct key *keyring, const char *sig, | |
168 | int siglen, const char *data, int datalen) | |
169 | { | |
170 | return -EOPNOTSUPP; | |
171 | } | |
172 | #endif | |
173 | ||
fd5f4e90 DK |
174 | #ifdef CONFIG_IMA_LOAD_X509 |
175 | void __init ima_load_x509(void); | |
176 | #else | |
177 | static inline void ima_load_x509(void) | |
178 | { | |
179 | } | |
180 | #endif | |
181 | ||
2ce523eb DK |
182 | #ifdef CONFIG_EVM_LOAD_X509 |
183 | void __init evm_load_x509(void); | |
184 | #else | |
185 | static inline void evm_load_x509(void) | |
186 | { | |
187 | } | |
188 | #endif | |
189 | ||
d726d8d7 MZ |
190 | #ifdef CONFIG_INTEGRITY_AUDIT |
191 | /* declarations */ | |
192 | void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
193 | const unsigned char *fname, const char *op, | |
194 | const char *cause, int result, int info); | |
195 | #else | |
196 | static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
197 | const unsigned char *fname, | |
198 | const char *op, const char *cause, | |
199 | int result, int info) | |
200 | { | |
201 | } | |
202 | #endif |