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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 { | |
38aa3f5a GS |
34 | /* New members must be added within the __struct_group() macro below. */ |
35 | __struct_group(evm_ima_xattr_data_hdr, hdr, __packed, | |
36 | u8 type; | |
37 | ); | |
650b29db TJB |
38 | u8 data[]; |
39 | } __packed; | |
40 | ||
41 | /* Only used in the EVM HMAC code. */ | |
42 | struct evm_xattr { | |
38aa3f5a | 43 | struct evm_ima_xattr_data_hdr data; |
6be5cc52 | 44 | u8 digest[SHA1_DIGEST_SIZE]; |
c7c8bb23 DK |
45 | } __packed; |
46 | ||
398c42e2 | 47 | #define IMA_MAX_DIGEST_SIZE HASH_MAX_DIGESTSIZE |
c7c8bb23 DK |
48 | |
49 | struct ima_digest_data { | |
38aa3f5a GS |
50 | /* New members must be added within the __struct_group() macro below. */ |
51 | __struct_group(ima_digest_data_hdr, hdr, __packed, | |
c7c8bb23 DK |
52 | u8 algo; |
53 | u8 length; | |
3ea7a560 DK |
54 | union { |
55 | struct { | |
56 | u8 unused; | |
57 | u8 type; | |
58 | } sha1; | |
59 | struct { | |
60 | u8 type; | |
61 | u8 algo; | |
62 | } ng; | |
63 | u8 data[2]; | |
64 | } xattr; | |
38aa3f5a | 65 | ); |
eb492c62 | 66 | u8 digest[]; |
c7c8bb23 | 67 | } __packed; |
6be5cc52 | 68 | |
8c54135e MZ |
69 | /* |
70 | * Instead of wrapping the ima_digest_data struct inside a local structure | |
71 | * with the maximum hash size, define ima_max_digest_data struct. | |
72 | */ | |
73 | struct ima_max_digest_data { | |
38aa3f5a | 74 | struct ima_digest_data_hdr hdr; |
8c54135e MZ |
75 | u8 digest[HASH_MAX_DIGESTSIZE]; |
76 | } __packed; | |
77 | ||
d3634d0f | 78 | /* |
398c42e2 MZ |
79 | * signature header format v2 - for using with asymmetric keys |
80 | * | |
81 | * The signature_v2_hdr struct includes a signature format version | |
82 | * to simplify defining new signature formats. | |
83 | * | |
84 | * signature format: | |
85 | * version 2: regular file data hash based signature | |
86 | * version 3: struct ima_file_id data based signature | |
d3634d0f DK |
87 | */ |
88 | struct signature_v2_hdr { | |
b1aaab22 | 89 | uint8_t type; /* xattr type */ |
d3634d0f | 90 | uint8_t version; /* signature format version */ |
4e8ae72a | 91 | uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */ |
bb543e39 TJB |
92 | __be32 keyid; /* IMA key identifier - not X509/PGP specific */ |
93 | __be16 sig_size; /* signature size */ | |
eb492c62 | 94 | uint8_t sig[]; /* signature payload */ |
d3634d0f DK |
95 | } __packed; |
96 | ||
398c42e2 MZ |
97 | /* |
98 | * IMA signature version 3 disambiguates the data that is signed, by | |
99 | * indirectly signing the hash of the ima_file_id structure data, | |
100 | * containing either the fsverity_descriptor struct digest or, in the | |
101 | * future, the regular IMA file hash. | |
102 | * | |
103 | * (The hash of the ima_file_id structure is only of the portion used.) | |
104 | */ | |
105 | struct ima_file_id { | |
106 | __u8 hash_type; /* xattr type [enum evm_ima_xattr_type] */ | |
107 | __u8 hash_algorithm; /* Digest algorithm [enum hash_algo] */ | |
108 | __u8 hash[HASH_MAX_DIGESTSIZE]; | |
109 | } __packed; | |
110 | ||
e3c4abbf | 111 | int integrity_kernel_read(struct file *file, loff_t offset, |
bb543e39 TJB |
112 | void *addr, unsigned long count); |
113 | ||
8607c501 | 114 | #define INTEGRITY_KEYRING_EVM 0 |
f4dc3778 | 115 | #define INTEGRITY_KEYRING_IMA 1 |
c7f7e58f | 116 | #define INTEGRITY_KEYRING_PLATFORM 2 |
d1996776 ES |
117 | #define INTEGRITY_KEYRING_MACHINE 3 |
118 | #define INTEGRITY_KEYRING_MAX 4 | |
8607c501 | 119 | |
0c343af8 MG |
120 | extern struct dentry *integrity_dir; |
121 | ||
39b07096 TJB |
122 | struct modsig; |
123 | ||
f1be242c | 124 | #ifdef CONFIG_INTEGRITY_SIGNATURE |
8607c501 DK |
125 | |
126 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, | |
089bc8e9 | 127 | const char *digest, int digestlen); |
39b07096 | 128 | int integrity_modsig_verify(unsigned int id, const struct modsig *modsig); |
8607c501 | 129 | |
d16a8585 | 130 | int __init integrity_init_keyring(const unsigned int id); |
9d03a721 | 131 | int __init integrity_load_x509(const unsigned int id, const char *path); |
60740acc | 132 | int __init integrity_load_cert(const unsigned int id, const char *source, |
028db3e2 | 133 | const void *data, size_t len, key_perm_t perm); |
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 | ||
39b07096 TJB |
143 | static inline int integrity_modsig_verify(unsigned int id, |
144 | const struct modsig *modsig) | |
145 | { | |
146 | return -EOPNOTSUPP; | |
147 | } | |
148 | ||
7d2ce232 MZ |
149 | static inline int integrity_init_keyring(const unsigned int id) |
150 | { | |
151 | return 0; | |
152 | } | |
60740acc NJ |
153 | |
154 | static inline int __init integrity_load_cert(const unsigned int id, | |
155 | const char *source, | |
156 | const void *data, size_t len, | |
028db3e2 | 157 | key_perm_t perm) |
60740acc NJ |
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 | ||
39b07096 TJB |
174 | #ifdef CONFIG_IMA_APPRAISE_MODSIG |
175 | int ima_modsig_verify(struct key *keyring, const struct modsig *modsig); | |
176 | #else | |
177 | static inline int ima_modsig_verify(struct key *keyring, | |
178 | const struct modsig *modsig) | |
179 | { | |
180 | return -EOPNOTSUPP; | |
181 | } | |
182 | #endif | |
183 | ||
fd5f4e90 DK |
184 | #ifdef CONFIG_IMA_LOAD_X509 |
185 | void __init ima_load_x509(void); | |
186 | #else | |
187 | static inline void ima_load_x509(void) | |
188 | { | |
189 | } | |
190 | #endif | |
191 | ||
2ce523eb DK |
192 | #ifdef CONFIG_EVM_LOAD_X509 |
193 | void __init evm_load_x509(void); | |
194 | #else | |
195 | static inline void evm_load_x509(void) | |
196 | { | |
197 | } | |
198 | #endif | |
199 | ||
d726d8d7 MZ |
200 | #ifdef CONFIG_INTEGRITY_AUDIT |
201 | /* declarations */ | |
202 | void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
203 | const unsigned char *fname, const char *op, | |
204 | const char *cause, int result, int info); | |
2afd020a | 205 | |
2f845882 LR |
206 | void integrity_audit_message(int audit_msgno, struct inode *inode, |
207 | const unsigned char *fname, const char *op, | |
208 | const char *cause, int result, int info, | |
209 | int errno); | |
210 | ||
2afd020a SB |
211 | static inline struct audit_buffer * |
212 | integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) | |
213 | { | |
214 | return audit_log_start(ctx, gfp_mask, type); | |
215 | } | |
216 | ||
d726d8d7 MZ |
217 | #else |
218 | static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
219 | const unsigned char *fname, | |
220 | const char *op, const char *cause, | |
221 | int result, int info) | |
222 | { | |
223 | } | |
2afd020a | 224 | |
2f845882 LR |
225 | static inline void integrity_audit_message(int audit_msgno, |
226 | struct inode *inode, | |
227 | const unsigned char *fname, | |
228 | const char *op, const char *cause, | |
229 | int result, int info, int errno) | |
230 | { | |
231 | } | |
232 | ||
2afd020a SB |
233 | static inline struct audit_buffer * |
234 | integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) | |
235 | { | |
236 | return NULL; | |
237 | } | |
238 | ||
d726d8d7 | 239 | #endif |
60740acc NJ |
240 | |
241 | #ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING | |
242 | void __init add_to_platform_keyring(const char *source, const void *data, | |
243 | size_t len); | |
244 | #else | |
245 | static inline void __init add_to_platform_keyring(const char *source, | |
246 | const void *data, size_t len) | |
247 | { | |
248 | } | |
249 | #endif | |
d1996776 ES |
250 | |
251 | #ifdef CONFIG_INTEGRITY_MACHINE_KEYRING | |
252 | void __init add_to_machine_keyring(const char *source, const void *data, size_t len); | |
4cb1ed94 | 253 | bool __init imputed_trust_enabled(void); |
d1996776 ES |
254 | #else |
255 | static inline void __init add_to_machine_keyring(const char *source, | |
256 | const void *data, size_t len) | |
257 | { | |
258 | } | |
4cb1ed94 NJ |
259 | |
260 | static inline bool __init imputed_trust_enabled(void) | |
3d6ae1a5 ES |
261 | { |
262 | return false; | |
263 | } | |
d1996776 | 264 | #endif |