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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 |
9044d627 | 34 | #define IMA_MODSIG_ALLOWED 0x20000000 |
45e2472e | 35 | |
d79d72e0 | 36 | #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ |
da1b0029 | 37 | IMA_HASH | IMA_APPRAISE_SUBMASK) |
d79d72e0 | 38 | #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ |
da1b0029 MZ |
39 | IMA_HASHED | IMA_COLLECTED | \ |
40 | IMA_APPRAISED_SUBMASK) | |
d79d72e0 MZ |
41 | |
42 | /* iint subaction appraise cache flags */ | |
da1b0029 MZ |
43 | #define IMA_FILE_APPRAISE 0x00001000 |
44 | #define IMA_FILE_APPRAISED 0x00002000 | |
45 | #define IMA_MMAP_APPRAISE 0x00004000 | |
46 | #define IMA_MMAP_APPRAISED 0x00008000 | |
47 | #define IMA_BPRM_APPRAISE 0x00010000 | |
48 | #define IMA_BPRM_APPRAISED 0x00020000 | |
49 | #define IMA_READ_APPRAISE 0x00040000 | |
50 | #define IMA_READ_APPRAISED 0x00080000 | |
d906c10d MG |
51 | #define IMA_CREDS_APPRAISE 0x00100000 |
52 | #define IMA_CREDS_APPRAISED 0x00200000 | |
d79d72e0 | 53 | #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ |
d906c10d MG |
54 | IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \ |
55 | IMA_CREDS_APPRAISE) | |
d79d72e0 | 56 | #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ |
d906c10d MG |
57 | IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \ |
58 | IMA_CREDS_APPRAISED) | |
f381c272 | 59 | |
0d73a552 DK |
60 | /* iint cache atomic_flags */ |
61 | #define IMA_CHANGE_XATTR 0 | |
62 | #define IMA_UPDATE_XATTR 1 | |
63 | #define IMA_CHANGE_ATTR 2 | |
64 | #define IMA_DIGSIG 3 | |
65 | #define IMA_MUST_MEASURE 4 | |
66 | ||
6be5cc52 DK |
67 | enum evm_ima_xattr_type { |
68 | IMA_XATTR_DIGEST = 0x01, | |
69 | EVM_XATTR_HMAC, | |
70 | EVM_IMA_XATTR_DIGSIG, | |
3ea7a560 | 71 | IMA_XATTR_DIGEST_NG, |
50b97748 | 72 | EVM_XATTR_PORTABLE_DIGSIG, |
a48fda9d | 73 | IMA_XATTR_LAST |
6be5cc52 DK |
74 | }; |
75 | ||
76 | struct evm_ima_xattr_data { | |
77 | u8 type; | |
650b29db TJB |
78 | u8 data[]; |
79 | } __packed; | |
80 | ||
81 | /* Only used in the EVM HMAC code. */ | |
82 | struct evm_xattr { | |
83 | struct evm_ima_xattr_data data; | |
6be5cc52 | 84 | u8 digest[SHA1_DIGEST_SIZE]; |
c7c8bb23 DK |
85 | } __packed; |
86 | ||
87 | #define IMA_MAX_DIGEST_SIZE 64 | |
88 | ||
89 | struct ima_digest_data { | |
90 | u8 algo; | |
91 | u8 length; | |
3ea7a560 DK |
92 | union { |
93 | struct { | |
94 | u8 unused; | |
95 | u8 type; | |
96 | } sha1; | |
97 | struct { | |
98 | u8 type; | |
99 | u8 algo; | |
100 | } ng; | |
101 | u8 data[2]; | |
102 | } xattr; | |
a35c3fb6 | 103 | u8 digest[0]; |
c7c8bb23 | 104 | } __packed; |
6be5cc52 | 105 | |
d3634d0f DK |
106 | /* |
107 | * signature format v2 - for using with asymmetric keys | |
108 | */ | |
109 | struct signature_v2_hdr { | |
b1aaab22 | 110 | uint8_t type; /* xattr type */ |
d3634d0f | 111 | uint8_t version; /* signature format version */ |
4e8ae72a | 112 | uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */ |
bb543e39 TJB |
113 | __be32 keyid; /* IMA key identifier - not X509/PGP specific */ |
114 | __be16 sig_size; /* signature size */ | |
d3634d0f DK |
115 | uint8_t sig[0]; /* signature payload */ |
116 | } __packed; | |
117 | ||
f381c272 MZ |
118 | /* integrity data associated with an inode */ |
119 | struct integrity_iint_cache { | |
c7c8bb23 | 120 | struct rb_node rb_node; /* rooted in integrity_iint_tree */ |
0d73a552 | 121 | struct mutex mutex; /* protects: version, flags, digest */ |
f381c272 MZ |
122 | struct inode *inode; /* back pointer to inode in question */ |
123 | u64 version; /* track inode changes */ | |
f578c08e | 124 | unsigned long flags; |
96d450bb | 125 | unsigned long measured_pcrs; |
0d73a552 | 126 | unsigned long atomic_flags; |
d79d72e0 MZ |
127 | enum integrity_status ima_file_status:4; |
128 | enum integrity_status ima_mmap_status:4; | |
129 | enum integrity_status ima_bprm_status:4; | |
cf222217 | 130 | enum integrity_status ima_read_status:4; |
d906c10d | 131 | enum integrity_status ima_creds_status:4; |
ee866331 | 132 | enum integrity_status evm_status:4; |
a35c3fb6 | 133 | struct ima_digest_data *ima_hash; |
f381c272 MZ |
134 | }; |
135 | ||
136 | /* rbtree tree calls to lookup, insert, delete | |
137 | * integrity data associated with an inode. | |
138 | */ | |
f381c272 | 139 | struct integrity_iint_cache *integrity_iint_find(struct inode *inode); |
4892722e | 140 | |
e3c4abbf | 141 | int integrity_kernel_read(struct file *file, loff_t offset, |
bb543e39 TJB |
142 | void *addr, unsigned long count); |
143 | ||
8607c501 | 144 | #define INTEGRITY_KEYRING_EVM 0 |
f4dc3778 | 145 | #define INTEGRITY_KEYRING_IMA 1 |
c7f7e58f TJB |
146 | #define INTEGRITY_KEYRING_PLATFORM 2 |
147 | #define INTEGRITY_KEYRING_MAX 3 | |
8607c501 | 148 | |
0c343af8 MG |
149 | extern struct dentry *integrity_dir; |
150 | ||
39b07096 TJB |
151 | struct modsig; |
152 | ||
f1be242c | 153 | #ifdef CONFIG_INTEGRITY_SIGNATURE |
8607c501 DK |
154 | |
155 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, | |
089bc8e9 | 156 | const char *digest, int digestlen); |
39b07096 | 157 | int integrity_modsig_verify(unsigned int id, const struct modsig *modsig); |
8607c501 | 158 | |
d16a8585 | 159 | int __init integrity_init_keyring(const unsigned int id); |
9d03a721 | 160 | int __init integrity_load_x509(const unsigned int id, const char *path); |
60740acc | 161 | int __init integrity_load_cert(const unsigned int id, const char *source, |
028db3e2 | 162 | const void *data, size_t len, key_perm_t perm); |
8607c501 DK |
163 | #else |
164 | ||
165 | static inline int integrity_digsig_verify(const unsigned int id, | |
166 | const char *sig, int siglen, | |
167 | const char *digest, int digestlen) | |
168 | { | |
169 | return -EOPNOTSUPP; | |
170 | } | |
171 | ||
39b07096 TJB |
172 | static inline int integrity_modsig_verify(unsigned int id, |
173 | const struct modsig *modsig) | |
174 | { | |
175 | return -EOPNOTSUPP; | |
176 | } | |
177 | ||
7d2ce232 MZ |
178 | static inline int integrity_init_keyring(const unsigned int id) |
179 | { | |
180 | return 0; | |
181 | } | |
60740acc NJ |
182 | |
183 | static inline int __init integrity_load_cert(const unsigned int id, | |
184 | const char *source, | |
185 | const void *data, size_t len, | |
028db3e2 | 186 | key_perm_t perm) |
60740acc NJ |
187 | { |
188 | return 0; | |
189 | } | |
f1be242c | 190 | #endif /* CONFIG_INTEGRITY_SIGNATURE */ |
8607c501 | 191 | |
e0751257 DK |
192 | #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS |
193 | int asymmetric_verify(struct key *keyring, const char *sig, | |
194 | int siglen, const char *data, int datalen); | |
195 | #else | |
196 | static inline int asymmetric_verify(struct key *keyring, const char *sig, | |
197 | int siglen, const char *data, int datalen) | |
198 | { | |
199 | return -EOPNOTSUPP; | |
200 | } | |
201 | #endif | |
202 | ||
39b07096 TJB |
203 | #ifdef CONFIG_IMA_APPRAISE_MODSIG |
204 | int ima_modsig_verify(struct key *keyring, const struct modsig *modsig); | |
205 | #else | |
206 | static inline int ima_modsig_verify(struct key *keyring, | |
207 | const struct modsig *modsig) | |
208 | { | |
209 | return -EOPNOTSUPP; | |
210 | } | |
211 | #endif | |
212 | ||
fd5f4e90 DK |
213 | #ifdef CONFIG_IMA_LOAD_X509 |
214 | void __init ima_load_x509(void); | |
215 | #else | |
216 | static inline void ima_load_x509(void) | |
217 | { | |
218 | } | |
219 | #endif | |
220 | ||
2ce523eb DK |
221 | #ifdef CONFIG_EVM_LOAD_X509 |
222 | void __init evm_load_x509(void); | |
223 | #else | |
224 | static inline void evm_load_x509(void) | |
225 | { | |
226 | } | |
227 | #endif | |
228 | ||
d726d8d7 MZ |
229 | #ifdef CONFIG_INTEGRITY_AUDIT |
230 | /* declarations */ | |
231 | void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
232 | const unsigned char *fname, const char *op, | |
233 | const char *cause, int result, int info); | |
2afd020a SB |
234 | |
235 | static inline struct audit_buffer * | |
236 | integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) | |
237 | { | |
238 | return audit_log_start(ctx, gfp_mask, type); | |
239 | } | |
240 | ||
d726d8d7 MZ |
241 | #else |
242 | static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
243 | const unsigned char *fname, | |
244 | const char *op, const char *cause, | |
245 | int result, int info) | |
246 | { | |
247 | } | |
2afd020a SB |
248 | |
249 | static inline struct audit_buffer * | |
250 | integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) | |
251 | { | |
252 | return NULL; | |
253 | } | |
254 | ||
d726d8d7 | 255 | #endif |
60740acc NJ |
256 | |
257 | #ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING | |
258 | void __init add_to_platform_keyring(const char *source, const void *data, | |
259 | size_t len); | |
260 | #else | |
261 | static inline void __init add_to_platform_keyring(const char *source, | |
262 | const void *data, size_t len) | |
263 | { | |
264 | } | |
265 | #endif |