devcg: propagate local changes down the hierarchy
[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 #include <linux/key.h>
18
19 /* iint action cache flags */
20 #define IMA_MEASURE             0x00000001
21 #define IMA_MEASURED            0x00000002
22 #define IMA_APPRAISE            0x00000004
23 #define IMA_APPRAISED           0x00000008
24 /*#define IMA_COLLECT           0x00000010  do not use this flag */
25 #define IMA_COLLECTED           0x00000020
26 #define IMA_AUDIT               0x00000040
27 #define IMA_AUDITED             0x00000080
28
29 /* iint cache flags */
30 #define IMA_ACTION_FLAGS        0xff000000
31 #define IMA_DIGSIG              0x01000000
32 #define IMA_DIGSIG_REQUIRED     0x02000000
33
34 #define IMA_DO_MASK             (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
35                                  IMA_APPRAISE_SUBMASK)
36 #define IMA_DONE_MASK           (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
37                                  IMA_COLLECTED | IMA_APPRAISED_SUBMASK)
38
39 /* iint subaction appraise cache flags */
40 #define IMA_FILE_APPRAISE       0x00000100
41 #define IMA_FILE_APPRAISED      0x00000200
42 #define IMA_MMAP_APPRAISE       0x00000400
43 #define IMA_MMAP_APPRAISED      0x00000800
44 #define IMA_BPRM_APPRAISE       0x00001000
45 #define IMA_BPRM_APPRAISED      0x00002000
46 #define IMA_MODULE_APPRAISE     0x00004000
47 #define IMA_MODULE_APPRAISED    0x00008000
48 #define IMA_APPRAISE_SUBMASK    (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
49                                  IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE)
50 #define IMA_APPRAISED_SUBMASK   (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
51                                  IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED)
52
53 enum evm_ima_xattr_type {
54         IMA_XATTR_DIGEST = 0x01,
55         EVM_XATTR_HMAC,
56         EVM_IMA_XATTR_DIGSIG,
57 };
58
59 struct evm_ima_xattr_data {
60         u8 type;
61         u8 digest[SHA1_DIGEST_SIZE];
62 }  __attribute__((packed));
63
64 /* integrity data associated with an inode */
65 struct integrity_iint_cache {
66         struct rb_node rb_node; /* rooted in integrity_iint_tree */
67         struct inode *inode;    /* back pointer to inode in question */
68         u64 version;            /* track inode changes */
69         unsigned long flags;
70         struct evm_ima_xattr_data ima_xattr;
71         enum integrity_status ima_file_status:4;
72         enum integrity_status ima_mmap_status:4;
73         enum integrity_status ima_bprm_status:4;
74         enum integrity_status ima_module_status:4;
75         enum integrity_status evm_status:4;
76 };
77
78 /* rbtree tree calls to lookup, insert, delete
79  * integrity data associated with an inode.
80  */
81 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
82 struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
83
84 #define INTEGRITY_KEYRING_EVM           0
85 #define INTEGRITY_KEYRING_MODULE        1
86 #define INTEGRITY_KEYRING_IMA           2
87 #define INTEGRITY_KEYRING_MAX           3
88
89 #ifdef CONFIG_INTEGRITY_SIGNATURE
90
91 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
92                                         const char *digest, int digestlen);
93
94 #else
95
96 static inline int integrity_digsig_verify(const unsigned int id,
97                                           const char *sig, int siglen,
98                                           const char *digest, int digestlen)
99 {
100         return -EOPNOTSUPP;
101 }
102
103 #endif /* CONFIG_INTEGRITY_SIGNATURE */
104
105 #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
106 int asymmetric_verify(struct key *keyring, const char *sig,
107                       int siglen, const char *data, int datalen);
108 #else
109 static inline int asymmetric_verify(struct key *keyring, const char *sig,
110                                     int siglen, const char *data, int datalen)
111 {
112         return -EOPNOTSUPP;
113 }
114 #endif
115
116 /* set during initialization */
117 extern int iint_initialized;