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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
53enum evm_ima_xattr_type {
54 IMA_XATTR_DIGEST = 0x01,
55 EVM_XATTR_HMAC,
56 EVM_IMA_XATTR_DIGSIG,
57};
58
59struct evm_ima_xattr_data {
60 u8 type;
61 u8 digest[SHA1_DIGEST_SIZE];
62} __attribute__((packed));
63
64/* integrity data associated with an inode */
65struct 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 */
81struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
82struct 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
91int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
92 const char *digest, int digestlen);
93
94#else
95
96static 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
106int asymmetric_verify(struct key *keyring, const char *sig,
107 int siglen, const char *data, int datalen);
108#else
109static 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 */
117extern int iint_initialized;