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9#include <linux/types.h>
10#include <linux/integrity.h>
11#include <crypto/sha.h>
12#include <linux/key.h>
13#include <linux/audit.h>
14
15
16#define IMA_MEASURE 0x00000001
17#define IMA_MEASURED 0x00000002
18#define IMA_APPRAISE 0x00000004
19#define IMA_APPRAISED 0x00000008
20
21#define IMA_COLLECTED 0x00000020
22#define IMA_AUDIT 0x00000040
23#define IMA_AUDITED 0x00000080
24#define IMA_HASH 0x00000100
25#define IMA_HASHED 0x00000200
26
27
28#define IMA_ACTION_FLAGS 0xff000000
29#define IMA_DIGSIG_REQUIRED 0x01000000
30#define IMA_PERMIT_DIRECTIO 0x02000000
31#define IMA_NEW_FILE 0x04000000
32#define EVM_IMMUTABLE_DIGSIG 0x08000000
33#define IMA_FAIL_UNVERIFIABLE_SIGS 0x10000000
34#define IMA_MODSIG_ALLOWED 0x20000000
35
36#define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
37 IMA_HASH | IMA_APPRAISE_SUBMASK)
38#define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
39 IMA_HASHED | IMA_COLLECTED | \
40 IMA_APPRAISED_SUBMASK)
41
42
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
51#define IMA_CREDS_APPRAISE 0x00100000
52#define IMA_CREDS_APPRAISED 0x00200000
53#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
54 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \
55 IMA_CREDS_APPRAISE)
56#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
57 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \
58 IMA_CREDS_APPRAISED)
59
60
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
67enum evm_ima_xattr_type {
68 IMA_XATTR_DIGEST = 0x01,
69 EVM_XATTR_HMAC,
70 EVM_IMA_XATTR_DIGSIG,
71 IMA_XATTR_DIGEST_NG,
72 EVM_XATTR_PORTABLE_DIGSIG,
73 IMA_XATTR_LAST
74};
75
76struct evm_ima_xattr_data {
77 u8 type;
78 u8 data[];
79} __packed;
80
81
82struct evm_xattr {
83 struct evm_ima_xattr_data data;
84 u8 digest[SHA1_DIGEST_SIZE];
85} __packed;
86
87#define IMA_MAX_DIGEST_SIZE 64
88
89struct ima_digest_data {
90 u8 algo;
91 u8 length;
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;
103 u8 digest[0];
104} __packed;
105
106
107
108
109struct signature_v2_hdr {
110 uint8_t type;
111 uint8_t version;
112 uint8_t hash_algo;
113 __be32 keyid;
114 __be16 sig_size;
115 uint8_t sig[0];
116} __packed;
117
118
119struct integrity_iint_cache {
120 struct rb_node rb_node;
121 struct mutex mutex;
122 struct inode *inode;
123 u64 version;
124 unsigned long flags;
125 unsigned long measured_pcrs;
126 unsigned long atomic_flags;
127 enum integrity_status ima_file_status:4;
128 enum integrity_status ima_mmap_status:4;
129 enum integrity_status ima_bprm_status:4;
130 enum integrity_status ima_read_status:4;
131 enum integrity_status ima_creds_status:4;
132 enum integrity_status evm_status:4;
133 struct ima_digest_data *ima_hash;
134};
135
136
137
138
139struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
140
141int integrity_kernel_read(struct file *file, loff_t offset,
142 void *addr, unsigned long count);
143
144#define INTEGRITY_KEYRING_EVM 0
145#define INTEGRITY_KEYRING_IMA 1
146#define INTEGRITY_KEYRING_PLATFORM 2
147#define INTEGRITY_KEYRING_MAX 3
148
149extern struct dentry *integrity_dir;
150
151struct modsig;
152
153#ifdef CONFIG_INTEGRITY_SIGNATURE
154
155int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
156 const char *digest, int digestlen);
157int integrity_modsig_verify(unsigned int id, const struct modsig *modsig);
158
159int __init integrity_init_keyring(const unsigned int id);
160int __init integrity_load_x509(const unsigned int id, const char *path);
161int __init integrity_load_cert(const unsigned int id, const char *source,
162 const void *data, size_t len, key_perm_t perm);
163#else
164
165static 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
172static inline int integrity_modsig_verify(unsigned int id,
173 const struct modsig *modsig)
174{
175 return -EOPNOTSUPP;
176}
177
178static inline int integrity_init_keyring(const unsigned int id)
179{
180 return 0;
181}
182
183static inline int __init integrity_load_cert(const unsigned int id,
184 const char *source,
185 const void *data, size_t len,
186 key_perm_t perm)
187{
188 return 0;
189}
190#endif
191
192#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
193int asymmetric_verify(struct key *keyring, const char *sig,
194 int siglen, const char *data, int datalen);
195#else
196static 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
203#ifdef CONFIG_IMA_APPRAISE_MODSIG
204int ima_modsig_verify(struct key *keyring, const struct modsig *modsig);
205#else
206static inline int ima_modsig_verify(struct key *keyring,
207 const struct modsig *modsig)
208{
209 return -EOPNOTSUPP;
210}
211#endif
212
213#ifdef CONFIG_IMA_LOAD_X509
214void __init ima_load_x509(void);
215#else
216static inline void ima_load_x509(void)
217{
218}
219#endif
220
221#ifdef CONFIG_EVM_LOAD_X509
222void __init evm_load_x509(void);
223#else
224static inline void evm_load_x509(void)
225{
226}
227#endif
228
229#ifdef CONFIG_INTEGRITY_AUDIT
230
231void 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);
234
235static inline struct audit_buffer *
236integrity_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
241#else
242static 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}
248
249static inline struct audit_buffer *
250integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
251{
252 return NULL;
253}
254
255#endif
256
257#ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING
258void __init add_to_platform_keyring(const char *source, const void *data,
259 size_t len);
260#else
261static inline void __init add_to_platform_keyring(const char *source,
262 const void *data, size_t len)
263{
264}
265#endif
266
