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#define IMA_HASH 0x00000100
29#define IMA_HASHED 0x00000200
30
31/* iint cache flags */
32#define IMA_ACTION_FLAGS 0xff000000
33#define IMA_ACTION_RULE_FLAGS 0x06000000
34#define IMA_DIGSIG_REQUIRED 0x01000000
35#define IMA_PERMIT_DIRECTIO 0x02000000
36#define IMA_NEW_FILE 0x04000000
37#define EVM_IMMUTABLE_DIGSIG 0x08000000
38
39#define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
40 IMA_HASH | IMA_APPRAISE_SUBMASK)
41#define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
42 IMA_HASHED | IMA_COLLECTED | \
43 IMA_APPRAISED_SUBMASK)
44
45/* iint subaction appraise cache flags */
46#define IMA_FILE_APPRAISE 0x00001000
47#define IMA_FILE_APPRAISED 0x00002000
48#define IMA_MMAP_APPRAISE 0x00004000
49#define IMA_MMAP_APPRAISED 0x00008000
50#define IMA_BPRM_APPRAISE 0x00010000
51#define IMA_BPRM_APPRAISED 0x00020000
52#define IMA_READ_APPRAISE 0x00040000
53#define IMA_READ_APPRAISED 0x00080000
54#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
55 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE)
56#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
57 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED)
58
59/* iint cache atomic_flags */
60#define IMA_CHANGE_XATTR 0
61#define IMA_UPDATE_XATTR 1
62#define IMA_CHANGE_ATTR 2
63#define IMA_DIGSIG 3
64#define IMA_MUST_MEASURE 4
65
66enum evm_ima_xattr_type {
67 IMA_XATTR_DIGEST = 0x01,
68 EVM_XATTR_HMAC,
69 EVM_IMA_XATTR_DIGSIG,
70 IMA_XATTR_DIGEST_NG,
71 EVM_XATTR_PORTABLE_DIGSIG,
72 IMA_XATTR_LAST
73};
74
75struct evm_ima_xattr_data {
76 u8 type;
77 u8 digest[SHA1_DIGEST_SIZE];
78} __packed;
79
80#define IMA_MAX_DIGEST_SIZE 64
81
82struct ima_digest_data {
83 u8 algo;
84 u8 length;
85 union {
86 struct {
87 u8 unused;
88 u8 type;
89 } sha1;
90 struct {
91 u8 type;
92 u8 algo;
93 } ng;
94 u8 data[2];
95 } xattr;
96 u8 digest[0];
97} __packed;
98
99/*
100 * signature format v2 - for using with asymmetric keys
101 */
102struct signature_v2_hdr {
103 uint8_t type; /* xattr type */
104 uint8_t version; /* signature format version */
105 uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */
106 __be32 keyid; /* IMA key identifier - not X509/PGP specific */
107 __be16 sig_size; /* signature size */
108 uint8_t sig[0]; /* signature payload */
109} __packed;
110
111/* integrity data associated with an inode */
112struct integrity_iint_cache {
113 struct rb_node rb_node; /* rooted in integrity_iint_tree */
114 struct mutex mutex; /* protects: version, flags, digest */
115 struct inode *inode; /* back pointer to inode in question */
116 u64 version; /* track inode changes */
117 unsigned long flags;
118 unsigned long measured_pcrs;
119 unsigned long atomic_flags;
120 enum integrity_status ima_file_status:4;
121 enum integrity_status ima_mmap_status:4;
122 enum integrity_status ima_bprm_status:4;
123 enum integrity_status ima_read_status:4;
124 enum integrity_status evm_status:4;
125 struct ima_digest_data *ima_hash;
126};
127
128/* rbtree tree calls to lookup, insert, delete
129 * integrity data associated with an inode.
130 */
131struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
132
133int integrity_kernel_read(struct file *file, loff_t offset,
134 void *addr, unsigned long count);
135
136#define INTEGRITY_KEYRING_EVM 0
137#define INTEGRITY_KEYRING_IMA 1
138#define INTEGRITY_KEYRING_MODULE 2
139#define INTEGRITY_KEYRING_MAX 3
140
141#ifdef CONFIG_INTEGRITY_SIGNATURE
142
143int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
144 const char *digest, int digestlen);
145
146int __init integrity_init_keyring(const unsigned int id);
147int __init integrity_load_x509(const unsigned int id, const char *path);
148#else
149
150static inline int integrity_digsig_verify(const unsigned int id,
151 const char *sig, int siglen,
152 const char *digest, int digestlen)
153{
154 return -EOPNOTSUPP;
155}
156
157static inline int integrity_init_keyring(const unsigned int id)
158{
159 return 0;
160}
161#endif /* CONFIG_INTEGRITY_SIGNATURE */
162
163#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
164int asymmetric_verify(struct key *keyring, const char *sig,
165 int siglen, const char *data, int datalen);
166#else
167static inline int asymmetric_verify(struct key *keyring, const char *sig,
168 int siglen, const char *data, int datalen)
169{
170 return -EOPNOTSUPP;
171}
172#endif
173
174#ifdef CONFIG_IMA_LOAD_X509
175void __init ima_load_x509(void);
176#else
177static inline void ima_load_x509(void)
178{
179}
180#endif
181
182#ifdef CONFIG_EVM_LOAD_X509
183void __init evm_load_x509(void);
184#else
185static inline void evm_load_x509(void)
186{
187}
188#endif
189
190#ifdef CONFIG_INTEGRITY_AUDIT
191/* declarations */
192void integrity_audit_msg(int audit_msgno, struct inode *inode,
193 const unsigned char *fname, const char *op,
194 const char *cause, int result, int info);
195#else
196static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
197 const unsigned char *fname,
198 const char *op, const char *cause,
199 int result, int info)
200{
201}
202#endif