Commit | Line | Data |
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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 | ||
555d6d71 TS |
9 | #ifdef pr_fmt |
10 | #undef pr_fmt | |
11 | #endif | |
12 | ||
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
14 | ||
f381c272 MZ |
15 | #include <linux/types.h> |
16 | #include <linux/integrity.h> | |
a24d22b2 | 17 | #include <crypto/sha1.h> |
8c54135e | 18 | #include <crypto/hash.h> |
e0751257 | 19 | #include <linux/key.h> |
2afd020a | 20 | #include <linux/audit.h> |
cd3cec0a | 21 | #include <linux/lsm_hooks.h> |
f381c272 | 22 | |
6be5cc52 DK |
23 | enum evm_ima_xattr_type { |
24 | IMA_XATTR_DIGEST = 0x01, | |
25 | EVM_XATTR_HMAC, | |
26 | EVM_IMA_XATTR_DIGSIG, | |
3ea7a560 | 27 | IMA_XATTR_DIGEST_NG, |
50b97748 | 28 | EVM_XATTR_PORTABLE_DIGSIG, |
398c42e2 | 29 | IMA_VERITY_DIGSIG, |
a48fda9d | 30 | IMA_XATTR_LAST |
6be5cc52 DK |
31 | }; |
32 | ||
33 | struct evm_ima_xattr_data { | |
34 | u8 type; | |
650b29db TJB |
35 | u8 data[]; |
36 | } __packed; | |
37 | ||
38 | /* Only used in the EVM HMAC code. */ | |
39 | struct evm_xattr { | |
40 | struct evm_ima_xattr_data data; | |
6be5cc52 | 41 | u8 digest[SHA1_DIGEST_SIZE]; |
c7c8bb23 DK |
42 | } __packed; |
43 | ||
398c42e2 | 44 | #define IMA_MAX_DIGEST_SIZE HASH_MAX_DIGESTSIZE |
c7c8bb23 DK |
45 | |
46 | struct ima_digest_data { | |
47 | u8 algo; | |
48 | u8 length; | |
3ea7a560 DK |
49 | union { |
50 | struct { | |
51 | u8 unused; | |
52 | u8 type; | |
53 | } sha1; | |
54 | struct { | |
55 | u8 type; | |
56 | u8 algo; | |
57 | } ng; | |
58 | u8 data[2]; | |
59 | } xattr; | |
eb492c62 | 60 | u8 digest[]; |
c7c8bb23 | 61 | } __packed; |
6be5cc52 | 62 | |
8c54135e MZ |
63 | /* |
64 | * Instead of wrapping the ima_digest_data struct inside a local structure | |
65 | * with the maximum hash size, define ima_max_digest_data struct. | |
66 | */ | |
67 | struct ima_max_digest_data { | |
68 | struct ima_digest_data hdr; | |
69 | u8 digest[HASH_MAX_DIGESTSIZE]; | |
70 | } __packed; | |
71 | ||
d3634d0f | 72 | /* |
398c42e2 MZ |
73 | * signature header format v2 - for using with asymmetric keys |
74 | * | |
75 | * The signature_v2_hdr struct includes a signature format version | |
76 | * to simplify defining new signature formats. | |
77 | * | |
78 | * signature format: | |
79 | * version 2: regular file data hash based signature | |
80 | * version 3: struct ima_file_id data based signature | |
d3634d0f DK |
81 | */ |
82 | struct signature_v2_hdr { | |
b1aaab22 | 83 | uint8_t type; /* xattr type */ |
d3634d0f | 84 | uint8_t version; /* signature format version */ |
4e8ae72a | 85 | uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */ |
bb543e39 TJB |
86 | __be32 keyid; /* IMA key identifier - not X509/PGP specific */ |
87 | __be16 sig_size; /* signature size */ | |
eb492c62 | 88 | uint8_t sig[]; /* signature payload */ |
d3634d0f DK |
89 | } __packed; |
90 | ||
398c42e2 MZ |
91 | /* |
92 | * IMA signature version 3 disambiguates the data that is signed, by | |
93 | * indirectly signing the hash of the ima_file_id structure data, | |
94 | * containing either the fsverity_descriptor struct digest or, in the | |
95 | * future, the regular IMA file hash. | |
96 | * | |
97 | * (The hash of the ima_file_id structure is only of the portion used.) | |
98 | */ | |
99 | struct ima_file_id { | |
100 | __u8 hash_type; /* xattr type [enum evm_ima_xattr_type] */ | |
101 | __u8 hash_algorithm; /* Digest algorithm [enum hash_algo] */ | |
102 | __u8 hash[HASH_MAX_DIGESTSIZE]; | |
103 | } __packed; | |
104 | ||
e3c4abbf | 105 | int integrity_kernel_read(struct file *file, loff_t offset, |
bb543e39 TJB |
106 | void *addr, unsigned long count); |
107 | ||
8607c501 | 108 | #define INTEGRITY_KEYRING_EVM 0 |
f4dc3778 | 109 | #define INTEGRITY_KEYRING_IMA 1 |
c7f7e58f | 110 | #define INTEGRITY_KEYRING_PLATFORM 2 |
d1996776 ES |
111 | #define INTEGRITY_KEYRING_MACHINE 3 |
112 | #define INTEGRITY_KEYRING_MAX 4 | |
8607c501 | 113 | |
0c343af8 MG |
114 | extern struct dentry *integrity_dir; |
115 | ||
39b07096 TJB |
116 | struct modsig; |
117 | ||
f1be242c | 118 | #ifdef CONFIG_INTEGRITY_SIGNATURE |
8607c501 DK |
119 | |
120 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, | |
089bc8e9 | 121 | const char *digest, int digestlen); |
39b07096 | 122 | int integrity_modsig_verify(unsigned int id, const struct modsig *modsig); |
8607c501 | 123 | |
d16a8585 | 124 | int __init integrity_init_keyring(const unsigned int id); |
9d03a721 | 125 | int __init integrity_load_x509(const unsigned int id, const char *path); |
60740acc | 126 | int __init integrity_load_cert(const unsigned int id, const char *source, |
028db3e2 | 127 | const void *data, size_t len, key_perm_t perm); |
8607c501 DK |
128 | #else |
129 | ||
130 | static inline int integrity_digsig_verify(const unsigned int id, | |
131 | const char *sig, int siglen, | |
132 | const char *digest, int digestlen) | |
133 | { | |
134 | return -EOPNOTSUPP; | |
135 | } | |
136 | ||
39b07096 TJB |
137 | static inline int integrity_modsig_verify(unsigned int id, |
138 | const struct modsig *modsig) | |
139 | { | |
140 | return -EOPNOTSUPP; | |
141 | } | |
142 | ||
7d2ce232 MZ |
143 | static inline int integrity_init_keyring(const unsigned int id) |
144 | { | |
145 | return 0; | |
146 | } | |
60740acc NJ |
147 | |
148 | static inline int __init integrity_load_cert(const unsigned int id, | |
149 | const char *source, | |
150 | const void *data, size_t len, | |
028db3e2 | 151 | key_perm_t perm) |
60740acc NJ |
152 | { |
153 | return 0; | |
154 | } | |
f1be242c | 155 | #endif /* CONFIG_INTEGRITY_SIGNATURE */ |
8607c501 | 156 | |
e0751257 DK |
157 | #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS |
158 | int asymmetric_verify(struct key *keyring, const char *sig, | |
159 | int siglen, const char *data, int datalen); | |
160 | #else | |
161 | static inline int asymmetric_verify(struct key *keyring, const char *sig, | |
162 | int siglen, const char *data, int datalen) | |
163 | { | |
164 | return -EOPNOTSUPP; | |
165 | } | |
166 | #endif | |
167 | ||
39b07096 TJB |
168 | #ifdef CONFIG_IMA_APPRAISE_MODSIG |
169 | int ima_modsig_verify(struct key *keyring, const struct modsig *modsig); | |
170 | #else | |
171 | static inline int ima_modsig_verify(struct key *keyring, | |
172 | const struct modsig *modsig) | |
173 | { | |
174 | return -EOPNOTSUPP; | |
175 | } | |
176 | #endif | |
177 | ||
fd5f4e90 DK |
178 | #ifdef CONFIG_IMA_LOAD_X509 |
179 | void __init ima_load_x509(void); | |
180 | #else | |
181 | static inline void ima_load_x509(void) | |
182 | { | |
183 | } | |
184 | #endif | |
185 | ||
2ce523eb DK |
186 | #ifdef CONFIG_EVM_LOAD_X509 |
187 | void __init evm_load_x509(void); | |
188 | #else | |
189 | static inline void evm_load_x509(void) | |
190 | { | |
191 | } | |
192 | #endif | |
193 | ||
d726d8d7 MZ |
194 | #ifdef CONFIG_INTEGRITY_AUDIT |
195 | /* declarations */ | |
196 | void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
197 | const unsigned char *fname, const char *op, | |
198 | const char *cause, int result, int info); | |
2afd020a | 199 | |
2f845882 LR |
200 | void integrity_audit_message(int audit_msgno, struct inode *inode, |
201 | const unsigned char *fname, const char *op, | |
202 | const char *cause, int result, int info, | |
203 | int errno); | |
204 | ||
2afd020a SB |
205 | static inline struct audit_buffer * |
206 | integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) | |
207 | { | |
208 | return audit_log_start(ctx, gfp_mask, type); | |
209 | } | |
210 | ||
d726d8d7 MZ |
211 | #else |
212 | static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
213 | const unsigned char *fname, | |
214 | const char *op, const char *cause, | |
215 | int result, int info) | |
216 | { | |
217 | } | |
2afd020a | 218 | |
2f845882 LR |
219 | static inline void integrity_audit_message(int audit_msgno, |
220 | struct inode *inode, | |
221 | const unsigned char *fname, | |
222 | const char *op, const char *cause, | |
223 | int result, int info, int errno) | |
224 | { | |
225 | } | |
226 | ||
2afd020a SB |
227 | static inline struct audit_buffer * |
228 | integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) | |
229 | { | |
230 | return NULL; | |
231 | } | |
232 | ||
d726d8d7 | 233 | #endif |
60740acc NJ |
234 | |
235 | #ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING | |
236 | void __init add_to_platform_keyring(const char *source, const void *data, | |
237 | size_t len); | |
238 | #else | |
239 | static inline void __init add_to_platform_keyring(const char *source, | |
240 | const void *data, size_t len) | |
241 | { | |
242 | } | |
243 | #endif | |
d1996776 ES |
244 | |
245 | #ifdef CONFIG_INTEGRITY_MACHINE_KEYRING | |
246 | void __init add_to_machine_keyring(const char *source, const void *data, size_t len); | |
4cb1ed94 | 247 | bool __init imputed_trust_enabled(void); |
d1996776 ES |
248 | #else |
249 | static inline void __init add_to_machine_keyring(const char *source, | |
250 | const void *data, size_t len) | |
251 | { | |
252 | } | |
4cb1ed94 NJ |
253 | |
254 | static inline bool __init imputed_trust_enabled(void) | |
3d6ae1a5 ES |
255 | { |
256 | return false; | |
257 | } | |
d1996776 | 258 | #endif |