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b886d83c | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
f381c272 MZ |
2 | /* |
3 | * Copyright (C) 2009-2010 IBM Corporation | |
4 | * | |
5 | * Authors: | |
6 | * Mimi Zohar <zohar@us.ibm.com> | |
f381c272 MZ |
7 | */ |
8 | ||
9 | #include <linux/types.h> | |
10 | #include <linux/integrity.h> | |
11 | #include <crypto/sha.h> | |
e0751257 | 12 | #include <linux/key.h> |
2afd020a | 13 | #include <linux/audit.h> |
f381c272 | 14 | |
45e2472e | 15 | /* iint action cache flags */ |
f578c08e MZ |
16 | #define IMA_MEASURE 0x00000001 |
17 | #define IMA_MEASURED 0x00000002 | |
18 | #define IMA_APPRAISE 0x00000004 | |
19 | #define IMA_APPRAISED 0x00000008 | |
20 | /*#define IMA_COLLECT 0x00000010 do not use this flag */ | |
21 | #define IMA_COLLECTED 0x00000020 | |
22 | #define IMA_AUDIT 0x00000040 | |
23 | #define IMA_AUDITED 0x00000080 | |
da1b0029 MZ |
24 | #define IMA_HASH 0x00000100 |
25 | #define IMA_HASHED 0x00000200 | |
45e2472e | 26 | |
f381c272 | 27 | /* iint cache flags */ |
f578c08e | 28 | #define IMA_ACTION_FLAGS 0xff000000 |
0d73a552 DK |
29 | #define IMA_DIGSIG_REQUIRED 0x01000000 |
30 | #define IMA_PERMIT_DIRECTIO 0x02000000 | |
31 | #define IMA_NEW_FILE 0x04000000 | |
32 | #define EVM_IMMUTABLE_DIGSIG 0x08000000 | |
9e67028e | 33 | #define IMA_FAIL_UNVERIFIABLE_SIGS 0x10000000 |
45e2472e | 34 | |
d79d72e0 | 35 | #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ |
da1b0029 | 36 | IMA_HASH | IMA_APPRAISE_SUBMASK) |
d79d72e0 | 37 | #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ |
da1b0029 MZ |
38 | IMA_HASHED | IMA_COLLECTED | \ |
39 | IMA_APPRAISED_SUBMASK) | |
d79d72e0 MZ |
40 | |
41 | /* iint subaction appraise cache flags */ | |
da1b0029 MZ |
42 | #define IMA_FILE_APPRAISE 0x00001000 |
43 | #define IMA_FILE_APPRAISED 0x00002000 | |
44 | #define IMA_MMAP_APPRAISE 0x00004000 | |
45 | #define IMA_MMAP_APPRAISED 0x00008000 | |
46 | #define IMA_BPRM_APPRAISE 0x00010000 | |
47 | #define IMA_BPRM_APPRAISED 0x00020000 | |
48 | #define IMA_READ_APPRAISE 0x00040000 | |
49 | #define IMA_READ_APPRAISED 0x00080000 | |
d906c10d MG |
50 | #define IMA_CREDS_APPRAISE 0x00100000 |
51 | #define IMA_CREDS_APPRAISED 0x00200000 | |
d79d72e0 | 52 | #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ |
d906c10d MG |
53 | IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \ |
54 | IMA_CREDS_APPRAISE) | |
d79d72e0 | 55 | #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ |
d906c10d MG |
56 | IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \ |
57 | IMA_CREDS_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; | |
650b29db TJB |
77 | u8 data[]; |
78 | } __packed; | |
79 | ||
80 | /* Only used in the EVM HMAC code. */ | |
81 | struct evm_xattr { | |
82 | struct evm_ima_xattr_data data; | |
6be5cc52 | 83 | u8 digest[SHA1_DIGEST_SIZE]; |
c7c8bb23 DK |
84 | } __packed; |
85 | ||
86 | #define IMA_MAX_DIGEST_SIZE 64 | |
87 | ||
88 | struct ima_digest_data { | |
89 | u8 algo; | |
90 | u8 length; | |
3ea7a560 DK |
91 | union { |
92 | struct { | |
93 | u8 unused; | |
94 | u8 type; | |
95 | } sha1; | |
96 | struct { | |
97 | u8 type; | |
98 | u8 algo; | |
99 | } ng; | |
100 | u8 data[2]; | |
101 | } xattr; | |
a35c3fb6 | 102 | u8 digest[0]; |
c7c8bb23 | 103 | } __packed; |
6be5cc52 | 104 | |
d3634d0f DK |
105 | /* |
106 | * signature format v2 - for using with asymmetric keys | |
107 | */ | |
108 | struct signature_v2_hdr { | |
b1aaab22 | 109 | uint8_t type; /* xattr type */ |
d3634d0f | 110 | uint8_t version; /* signature format version */ |
4e8ae72a | 111 | uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */ |
bb543e39 TJB |
112 | __be32 keyid; /* IMA key identifier - not X509/PGP specific */ |
113 | __be16 sig_size; /* signature size */ | |
d3634d0f DK |
114 | uint8_t sig[0]; /* signature payload */ |
115 | } __packed; | |
116 | ||
f381c272 MZ |
117 | /* integrity data associated with an inode */ |
118 | struct integrity_iint_cache { | |
c7c8bb23 | 119 | struct rb_node rb_node; /* rooted in integrity_iint_tree */ |
0d73a552 | 120 | struct mutex mutex; /* protects: version, flags, digest */ |
f381c272 MZ |
121 | struct inode *inode; /* back pointer to inode in question */ |
122 | u64 version; /* track inode changes */ | |
f578c08e | 123 | unsigned long flags; |
96d450bb | 124 | unsigned long measured_pcrs; |
0d73a552 | 125 | unsigned long atomic_flags; |
d79d72e0 MZ |
126 | enum integrity_status ima_file_status:4; |
127 | enum integrity_status ima_mmap_status:4; | |
128 | enum integrity_status ima_bprm_status:4; | |
cf222217 | 129 | enum integrity_status ima_read_status:4; |
d906c10d | 130 | enum integrity_status ima_creds_status:4; |
ee866331 | 131 | enum integrity_status evm_status:4; |
a35c3fb6 | 132 | struct ima_digest_data *ima_hash; |
f381c272 MZ |
133 | }; |
134 | ||
135 | /* rbtree tree calls to lookup, insert, delete | |
136 | * integrity data associated with an inode. | |
137 | */ | |
f381c272 | 138 | struct integrity_iint_cache *integrity_iint_find(struct inode *inode); |
4892722e | 139 | |
e3c4abbf | 140 | int integrity_kernel_read(struct file *file, loff_t offset, |
bb543e39 TJB |
141 | void *addr, unsigned long count); |
142 | ||
8607c501 | 143 | #define INTEGRITY_KEYRING_EVM 0 |
f4dc3778 | 144 | #define INTEGRITY_KEYRING_IMA 1 |
c7f7e58f TJB |
145 | #define INTEGRITY_KEYRING_PLATFORM 2 |
146 | #define INTEGRITY_KEYRING_MAX 3 | |
8607c501 | 147 | |
0c343af8 MG |
148 | extern struct dentry *integrity_dir; |
149 | ||
f1be242c | 150 | #ifdef CONFIG_INTEGRITY_SIGNATURE |
8607c501 DK |
151 | |
152 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, | |
089bc8e9 | 153 | const char *digest, int digestlen); |
8607c501 | 154 | |
d16a8585 | 155 | int __init integrity_init_keyring(const unsigned int id); |
9d03a721 | 156 | int __init integrity_load_x509(const unsigned int id, const char *path); |
60740acc | 157 | int __init integrity_load_cert(const unsigned int id, const char *source, |
028db3e2 | 158 | const void *data, size_t len, key_perm_t perm); |
8607c501 DK |
159 | #else |
160 | ||
161 | static inline int integrity_digsig_verify(const unsigned int id, | |
162 | const char *sig, int siglen, | |
163 | const char *digest, int digestlen) | |
164 | { | |
165 | return -EOPNOTSUPP; | |
166 | } | |
167 | ||
7d2ce232 MZ |
168 | static inline int integrity_init_keyring(const unsigned int id) |
169 | { | |
170 | return 0; | |
171 | } | |
60740acc NJ |
172 | |
173 | static inline int __init integrity_load_cert(const unsigned int id, | |
174 | const char *source, | |
175 | const void *data, size_t len, | |
028db3e2 | 176 | key_perm_t perm) |
60740acc NJ |
177 | { |
178 | return 0; | |
179 | } | |
f1be242c | 180 | #endif /* CONFIG_INTEGRITY_SIGNATURE */ |
8607c501 | 181 | |
e0751257 DK |
182 | #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS |
183 | int asymmetric_verify(struct key *keyring, const char *sig, | |
184 | int siglen, const char *data, int datalen); | |
185 | #else | |
186 | static inline int asymmetric_verify(struct key *keyring, const char *sig, | |
187 | int siglen, const char *data, int datalen) | |
188 | { | |
189 | return -EOPNOTSUPP; | |
190 | } | |
191 | #endif | |
192 | ||
fd5f4e90 DK |
193 | #ifdef CONFIG_IMA_LOAD_X509 |
194 | void __init ima_load_x509(void); | |
195 | #else | |
196 | static inline void ima_load_x509(void) | |
197 | { | |
198 | } | |
199 | #endif | |
200 | ||
2ce523eb DK |
201 | #ifdef CONFIG_EVM_LOAD_X509 |
202 | void __init evm_load_x509(void); | |
203 | #else | |
204 | static inline void evm_load_x509(void) | |
205 | { | |
206 | } | |
207 | #endif | |
208 | ||
d726d8d7 MZ |
209 | #ifdef CONFIG_INTEGRITY_AUDIT |
210 | /* declarations */ | |
211 | void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
212 | const unsigned char *fname, const char *op, | |
213 | const char *cause, int result, int info); | |
2afd020a SB |
214 | |
215 | static inline struct audit_buffer * | |
216 | integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) | |
217 | { | |
218 | return audit_log_start(ctx, gfp_mask, type); | |
219 | } | |
220 | ||
d726d8d7 MZ |
221 | #else |
222 | static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
223 | const unsigned char *fname, | |
224 | const char *op, const char *cause, | |
225 | int result, int info) | |
226 | { | |
227 | } | |
2afd020a SB |
228 | |
229 | static inline struct audit_buffer * | |
230 | integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) | |
231 | { | |
232 | return NULL; | |
233 | } | |
234 | ||
d726d8d7 | 235 | #endif |
60740acc NJ |
236 | |
237 | #ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING | |
238 | void __init add_to_platform_keyring(const char *source, const void *data, | |
239 | size_t len); | |
240 | #else | |
241 | static inline void __init add_to_platform_keyring(const char *source, | |
242 | const void *data, size_t len) | |
243 | { | |
244 | } | |
245 | #endif |