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
integrity_digsig_verify(const unsigned int id,const char * sig,int siglen,const char * digest,int digestlen)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
asymmetric_verify(struct key * keyring,const char * sig,int siglen,const char * data,int datalen)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;
118