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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> | |
17 | #include <crypto/sha.h> | |
e0751257 | 18 | #include <linux/key.h> |
2afd020a | 19 | #include <linux/audit.h> |
f381c272 | 20 | |
45e2472e | 21 | /* iint action cache flags */ |
f578c08e MZ |
22 | #define IMA_MEASURE 0x00000001 |
23 | #define IMA_MEASURED 0x00000002 | |
24 | #define IMA_APPRAISE 0x00000004 | |
25 | #define IMA_APPRAISED 0x00000008 | |
26 | /*#define IMA_COLLECT 0x00000010 do not use this flag */ | |
27 | #define IMA_COLLECTED 0x00000020 | |
28 | #define IMA_AUDIT 0x00000040 | |
29 | #define IMA_AUDITED 0x00000080 | |
da1b0029 MZ |
30 | #define IMA_HASH 0x00000100 |
31 | #define IMA_HASHED 0x00000200 | |
45e2472e | 32 | |
f381c272 | 33 | /* iint cache flags */ |
f578c08e | 34 | #define IMA_ACTION_FLAGS 0xff000000 |
0d73a552 DK |
35 | #define IMA_DIGSIG_REQUIRED 0x01000000 |
36 | #define IMA_PERMIT_DIRECTIO 0x02000000 | |
37 | #define IMA_NEW_FILE 0x04000000 | |
38 | #define EVM_IMMUTABLE_DIGSIG 0x08000000 | |
9e67028e | 39 | #define IMA_FAIL_UNVERIFIABLE_SIGS 0x10000000 |
9044d627 | 40 | #define IMA_MODSIG_ALLOWED 0x20000000 |
273df864 | 41 | #define IMA_CHECK_BLACKLIST 0x40000000 |
45e2472e | 42 | |
d79d72e0 | 43 | #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ |
da1b0029 | 44 | IMA_HASH | IMA_APPRAISE_SUBMASK) |
d79d72e0 | 45 | #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \ |
da1b0029 MZ |
46 | IMA_HASHED | IMA_COLLECTED | \ |
47 | IMA_APPRAISED_SUBMASK) | |
d79d72e0 MZ |
48 | |
49 | /* iint subaction appraise cache flags */ | |
da1b0029 MZ |
50 | #define IMA_FILE_APPRAISE 0x00001000 |
51 | #define IMA_FILE_APPRAISED 0x00002000 | |
52 | #define IMA_MMAP_APPRAISE 0x00004000 | |
53 | #define IMA_MMAP_APPRAISED 0x00008000 | |
54 | #define IMA_BPRM_APPRAISE 0x00010000 | |
55 | #define IMA_BPRM_APPRAISED 0x00020000 | |
56 | #define IMA_READ_APPRAISE 0x00040000 | |
57 | #define IMA_READ_APPRAISED 0x00080000 | |
d906c10d MG |
58 | #define IMA_CREDS_APPRAISE 0x00100000 |
59 | #define IMA_CREDS_APPRAISED 0x00200000 | |
d79d72e0 | 60 | #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ |
d906c10d MG |
61 | IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \ |
62 | IMA_CREDS_APPRAISE) | |
d79d72e0 | 63 | #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ |
d906c10d MG |
64 | IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \ |
65 | IMA_CREDS_APPRAISED) | |
f381c272 | 66 | |
0d73a552 DK |
67 | /* iint cache atomic_flags */ |
68 | #define IMA_CHANGE_XATTR 0 | |
69 | #define IMA_UPDATE_XATTR 1 | |
70 | #define IMA_CHANGE_ATTR 2 | |
71 | #define IMA_DIGSIG 3 | |
72 | #define IMA_MUST_MEASURE 4 | |
73 | ||
6be5cc52 DK |
74 | enum evm_ima_xattr_type { |
75 | IMA_XATTR_DIGEST = 0x01, | |
76 | EVM_XATTR_HMAC, | |
77 | EVM_IMA_XATTR_DIGSIG, | |
3ea7a560 | 78 | IMA_XATTR_DIGEST_NG, |
50b97748 | 79 | EVM_XATTR_PORTABLE_DIGSIG, |
a48fda9d | 80 | IMA_XATTR_LAST |
6be5cc52 DK |
81 | }; |
82 | ||
83 | struct evm_ima_xattr_data { | |
84 | u8 type; | |
650b29db TJB |
85 | u8 data[]; |
86 | } __packed; | |
87 | ||
88 | /* Only used in the EVM HMAC code. */ | |
89 | struct evm_xattr { | |
90 | struct evm_ima_xattr_data data; | |
6be5cc52 | 91 | u8 digest[SHA1_DIGEST_SIZE]; |
c7c8bb23 DK |
92 | } __packed; |
93 | ||
94 | #define IMA_MAX_DIGEST_SIZE 64 | |
95 | ||
96 | struct ima_digest_data { | |
97 | u8 algo; | |
98 | u8 length; | |
3ea7a560 DK |
99 | union { |
100 | struct { | |
101 | u8 unused; | |
102 | u8 type; | |
103 | } sha1; | |
104 | struct { | |
105 | u8 type; | |
106 | u8 algo; | |
107 | } ng; | |
108 | u8 data[2]; | |
109 | } xattr; | |
eb492c62 | 110 | u8 digest[]; |
c7c8bb23 | 111 | } __packed; |
6be5cc52 | 112 | |
d3634d0f DK |
113 | /* |
114 | * signature format v2 - for using with asymmetric keys | |
115 | */ | |
116 | struct signature_v2_hdr { | |
b1aaab22 | 117 | uint8_t type; /* xattr type */ |
d3634d0f | 118 | uint8_t version; /* signature format version */ |
4e8ae72a | 119 | uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */ |
bb543e39 TJB |
120 | __be32 keyid; /* IMA key identifier - not X509/PGP specific */ |
121 | __be16 sig_size; /* signature size */ | |
eb492c62 | 122 | uint8_t sig[]; /* signature payload */ |
d3634d0f DK |
123 | } __packed; |
124 | ||
f381c272 MZ |
125 | /* integrity data associated with an inode */ |
126 | struct integrity_iint_cache { | |
c7c8bb23 | 127 | struct rb_node rb_node; /* rooted in integrity_iint_tree */ |
0d73a552 | 128 | struct mutex mutex; /* protects: version, flags, digest */ |
f381c272 MZ |
129 | struct inode *inode; /* back pointer to inode in question */ |
130 | u64 version; /* track inode changes */ | |
f578c08e | 131 | unsigned long flags; |
96d450bb | 132 | unsigned long measured_pcrs; |
0d73a552 | 133 | unsigned long atomic_flags; |
d79d72e0 MZ |
134 | enum integrity_status ima_file_status:4; |
135 | enum integrity_status ima_mmap_status:4; | |
136 | enum integrity_status ima_bprm_status:4; | |
cf222217 | 137 | enum integrity_status ima_read_status:4; |
d906c10d | 138 | enum integrity_status ima_creds_status:4; |
ee866331 | 139 | enum integrity_status evm_status:4; |
a35c3fb6 | 140 | struct ima_digest_data *ima_hash; |
f381c272 MZ |
141 | }; |
142 | ||
143 | /* rbtree tree calls to lookup, insert, delete | |
144 | * integrity data associated with an inode. | |
145 | */ | |
f381c272 | 146 | struct integrity_iint_cache *integrity_iint_find(struct inode *inode); |
4892722e | 147 | |
e3c4abbf | 148 | int integrity_kernel_read(struct file *file, loff_t offset, |
bb543e39 TJB |
149 | void *addr, unsigned long count); |
150 | ||
8607c501 | 151 | #define INTEGRITY_KEYRING_EVM 0 |
f4dc3778 | 152 | #define INTEGRITY_KEYRING_IMA 1 |
c7f7e58f TJB |
153 | #define INTEGRITY_KEYRING_PLATFORM 2 |
154 | #define INTEGRITY_KEYRING_MAX 3 | |
8607c501 | 155 | |
0c343af8 MG |
156 | extern struct dentry *integrity_dir; |
157 | ||
39b07096 TJB |
158 | struct modsig; |
159 | ||
f1be242c | 160 | #ifdef CONFIG_INTEGRITY_SIGNATURE |
8607c501 DK |
161 | |
162 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, | |
089bc8e9 | 163 | const char *digest, int digestlen); |
39b07096 | 164 | int integrity_modsig_verify(unsigned int id, const struct modsig *modsig); |
8607c501 | 165 | |
d16a8585 | 166 | int __init integrity_init_keyring(const unsigned int id); |
9d03a721 | 167 | int __init integrity_load_x509(const unsigned int id, const char *path); |
60740acc | 168 | int __init integrity_load_cert(const unsigned int id, const char *source, |
028db3e2 | 169 | const void *data, size_t len, key_perm_t perm); |
8607c501 DK |
170 | #else |
171 | ||
172 | static inline int integrity_digsig_verify(const unsigned int id, | |
173 | const char *sig, int siglen, | |
174 | const char *digest, int digestlen) | |
175 | { | |
176 | return -EOPNOTSUPP; | |
177 | } | |
178 | ||
39b07096 TJB |
179 | static inline int integrity_modsig_verify(unsigned int id, |
180 | const struct modsig *modsig) | |
181 | { | |
182 | return -EOPNOTSUPP; | |
183 | } | |
184 | ||
7d2ce232 MZ |
185 | static inline int integrity_init_keyring(const unsigned int id) |
186 | { | |
187 | return 0; | |
188 | } | |
60740acc NJ |
189 | |
190 | static inline int __init integrity_load_cert(const unsigned int id, | |
191 | const char *source, | |
192 | const void *data, size_t len, | |
028db3e2 | 193 | key_perm_t perm) |
60740acc NJ |
194 | { |
195 | return 0; | |
196 | } | |
f1be242c | 197 | #endif /* CONFIG_INTEGRITY_SIGNATURE */ |
8607c501 | 198 | |
e0751257 DK |
199 | #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS |
200 | int asymmetric_verify(struct key *keyring, const char *sig, | |
201 | int siglen, const char *data, int datalen); | |
202 | #else | |
203 | static inline int asymmetric_verify(struct key *keyring, const char *sig, | |
204 | int siglen, const char *data, int datalen) | |
205 | { | |
206 | return -EOPNOTSUPP; | |
207 | } | |
208 | #endif | |
209 | ||
39b07096 TJB |
210 | #ifdef CONFIG_IMA_APPRAISE_MODSIG |
211 | int ima_modsig_verify(struct key *keyring, const struct modsig *modsig); | |
212 | #else | |
213 | static inline int ima_modsig_verify(struct key *keyring, | |
214 | const struct modsig *modsig) | |
215 | { | |
216 | return -EOPNOTSUPP; | |
217 | } | |
218 | #endif | |
219 | ||
fd5f4e90 DK |
220 | #ifdef CONFIG_IMA_LOAD_X509 |
221 | void __init ima_load_x509(void); | |
222 | #else | |
223 | static inline void ima_load_x509(void) | |
224 | { | |
225 | } | |
226 | #endif | |
227 | ||
2ce523eb DK |
228 | #ifdef CONFIG_EVM_LOAD_X509 |
229 | void __init evm_load_x509(void); | |
230 | #else | |
231 | static inline void evm_load_x509(void) | |
232 | { | |
233 | } | |
234 | #endif | |
235 | ||
d726d8d7 MZ |
236 | #ifdef CONFIG_INTEGRITY_AUDIT |
237 | /* declarations */ | |
238 | void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
239 | const unsigned char *fname, const char *op, | |
240 | const char *cause, int result, int info); | |
2afd020a | 241 | |
2f845882 LR |
242 | void integrity_audit_message(int audit_msgno, struct inode *inode, |
243 | const unsigned char *fname, const char *op, | |
244 | const char *cause, int result, int info, | |
245 | int errno); | |
246 | ||
2afd020a SB |
247 | static inline struct audit_buffer * |
248 | integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) | |
249 | { | |
250 | return audit_log_start(ctx, gfp_mask, type); | |
251 | } | |
252 | ||
d726d8d7 MZ |
253 | #else |
254 | static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, | |
255 | const unsigned char *fname, | |
256 | const char *op, const char *cause, | |
257 | int result, int info) | |
258 | { | |
259 | } | |
2afd020a | 260 | |
2f845882 LR |
261 | static inline void integrity_audit_message(int audit_msgno, |
262 | struct inode *inode, | |
263 | const unsigned char *fname, | |
264 | const char *op, const char *cause, | |
265 | int result, int info, int errno) | |
266 | { | |
267 | } | |
268 | ||
2afd020a SB |
269 | static inline struct audit_buffer * |
270 | integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) | |
271 | { | |
272 | return NULL; | |
273 | } | |
274 | ||
d726d8d7 | 275 | #endif |
60740acc NJ |
276 | |
277 | #ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING | |
278 | void __init add_to_platform_keyring(const char *source, const void *data, | |
279 | size_t len); | |
280 | #else | |
281 | static inline void __init add_to_platform_keyring(const char *source, | |
282 | const void *data, size_t len) | |
283 | { | |
284 | } | |
285 | #endif |