Merge branch 'for-linus' of git://selinuxproject.org/~jmorris/linux-security
[linux-3.10.git] / security / integrity / integrity.h
1 /*
2  * Copyright (C) 2009-2010 IBM Corporation
3  *
4  * Authors:
5  * Mimi Zohar <zohar@us.ibm.com>
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License as
9  * published by the Free Software Foundation, version 2 of the
10  * License.
11  *
12  */
13
14 #include <linux/types.h>
15 #include <linux/integrity.h>
16 #include <crypto/sha.h>
17
18 /* iint cache flags */
19 #define IMA_MEASURED            0x01
20
21 enum evm_ima_xattr_type {
22         IMA_XATTR_DIGEST = 0x01,
23         EVM_XATTR_HMAC,
24         EVM_IMA_XATTR_DIGSIG,
25 };
26
27 struct evm_ima_xattr_data {
28         u8 type;
29         u8 digest[SHA1_DIGEST_SIZE];
30 }  __attribute__((packed));
31
32 /* integrity data associated with an inode */
33 struct integrity_iint_cache {
34         struct rb_node rb_node; /* rooted in integrity_iint_tree */
35         struct inode *inode;    /* back pointer to inode in question */
36         u64 version;            /* track inode changes */
37         unsigned char flags;
38         u8 digest[SHA1_DIGEST_SIZE];
39         struct mutex mutex;     /* protects: version, flags, digest */
40         enum integrity_status evm_status;
41 };
42
43 /* rbtree tree calls to lookup, insert, delete
44  * integrity data associated with an inode.
45  */
46 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
47 struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
48
49 #define INTEGRITY_KEYRING_EVM           0
50 #define INTEGRITY_KEYRING_MODULE        1
51 #define INTEGRITY_KEYRING_IMA           2
52 #define INTEGRITY_KEYRING_MAX           3
53
54 #ifdef CONFIG_INTEGRITY_DIGSIG
55
56 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
57                                         const char *digest, int digestlen);
58
59 #else
60
61 static inline int integrity_digsig_verify(const unsigned int id,
62                                           const char *sig, int siglen,
63                                           const char *digest, int digestlen)
64 {
65         return -EOPNOTSUPP;
66 }
67
68 #endif /* CONFIG_INTEGRITY_DIGSIG */
69
70 /* set during initialization */
71 extern int iint_initialized;