tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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#define IMA_PERMIT_DIRECTIO 0x04000000
34
35#define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
36 IMA_APPRAISE_SUBMASK)
37#define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
38 IMA_COLLECTED | IMA_APPRAISED_SUBMASK)
39
40/* iint subaction appraise cache flags */
41#define IMA_FILE_APPRAISE 0x00000100
42#define IMA_FILE_APPRAISED 0x00000200
43#define IMA_MMAP_APPRAISE 0x00000400
44#define IMA_MMAP_APPRAISED 0x00000800
45#define IMA_BPRM_APPRAISE 0x00001000
46#define IMA_BPRM_APPRAISED 0x00002000
47#define IMA_MODULE_APPRAISE 0x00004000
48#define IMA_MODULE_APPRAISED 0x00008000
49#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
50 IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE)
51#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
52 IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED)
53
54enum evm_ima_xattr_type {
55 IMA_XATTR_DIGEST = 0x01,
56 EVM_XATTR_HMAC,
57 EVM_IMA_XATTR_DIGSIG,
58 IMA_XATTR_DIGEST_NG,
59};
60
61struct evm_ima_xattr_data {
62 u8 type;
63 u8 digest[SHA1_DIGEST_SIZE];
64} __packed;
65
66#define IMA_MAX_DIGEST_SIZE 64
67
68struct ima_digest_data {
69 u8 algo;
70 u8 length;
71 union {
72 struct {
73 u8 unused;
74 u8 type;
75 } sha1;
76 struct {
77 u8 type;
78 u8 algo;
79 } ng;
80 u8 data[2];
81 } xattr;
82 u8 digest[0];
83} __packed;
84
85/*
86 * signature format v2 - for using with asymmetric keys
87 */
88struct signature_v2_hdr {
89 uint8_t type; /* xattr type */
90 uint8_t version; /* signature format version */
91 uint8_t hash_algo; /* Digest algorithm [enum pkey_hash_algo] */
92 uint32_t keyid; /* IMA key identifier - not X509/PGP specific */
93 uint16_t sig_size; /* signature size */
94 uint8_t sig[0]; /* signature payload */
95} __packed;
96
97/* integrity data associated with an inode */
98struct integrity_iint_cache {
99 struct rb_node rb_node; /* rooted in integrity_iint_tree */
100 struct inode *inode; /* back pointer to inode in question */
101 u64 version; /* track inode changes */
102 unsigned long flags;
103 enum integrity_status ima_file_status:4;
104 enum integrity_status ima_mmap_status:4;
105 enum integrity_status ima_bprm_status:4;
106 enum integrity_status ima_module_status:4;
107 enum integrity_status evm_status:4;
108 struct ima_digest_data *ima_hash;
109};
110
111/* rbtree tree calls to lookup, insert, delete
112 * integrity data associated with an inode.
113 */
114struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
115struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
116
117#define INTEGRITY_KEYRING_EVM 0
118#define INTEGRITY_KEYRING_MODULE 1
119#define INTEGRITY_KEYRING_IMA 2
120#define INTEGRITY_KEYRING_MAX 3
121
122#ifdef CONFIG_INTEGRITY_SIGNATURE
123
124int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
125 const char *digest, int digestlen);
126
127#else
128
129static inline int integrity_digsig_verify(const unsigned int id,
130 const char *sig, int siglen,
131 const char *digest, int digestlen)
132{
133 return -EOPNOTSUPP;
134}
135
136#endif /* CONFIG_INTEGRITY_SIGNATURE */
137
138#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
139int asymmetric_verify(struct key *keyring, const char *sig,
140 int siglen, const char *data, int datalen);
141#else
142static inline int asymmetric_verify(struct key *keyring, const char *sig,
143 int siglen, const char *data, int datalen)
144{
145 return -EOPNOTSUPP;
146}
147#endif
148
149#ifdef CONFIG_INTEGRITY_AUDIT
150/* declarations */
151void integrity_audit_msg(int audit_msgno, struct inode *inode,
152 const unsigned char *fname, const char *op,
153 const char *cause, int result, int info);
154#else
155static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
156 const unsigned char *fname,
157 const char *op, const char *cause,
158 int result, int info)
159{
160}
161#endif
162
163/* set during initialization */
164extern int iint_initialized;