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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#define IMA_PERMIT_DIRECTIO 0x04000000
34#define IMA_NEW_FILE 0x08000000
35
36#define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
37 IMA_APPRAISE_SUBMASK)
38#define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
39 IMA_COLLECTED | IMA_APPRAISED_SUBMASK)
40
41/* iint subaction appraise cache flags */
42#define IMA_FILE_APPRAISE 0x00000100
43#define IMA_FILE_APPRAISED 0x00000200
44#define IMA_MMAP_APPRAISE 0x00000400
45#define IMA_MMAP_APPRAISED 0x00000800
46#define IMA_BPRM_APPRAISE 0x00001000
47#define IMA_BPRM_APPRAISED 0x00002000
48#define IMA_READ_APPRAISE 0x00004000
49#define IMA_READ_APPRAISED 0x00008000
50#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
51 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE)
52#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
53 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED)
54
55enum evm_ima_xattr_type {
56 IMA_XATTR_DIGEST = 0x01,
57 EVM_XATTR_HMAC,
58 EVM_IMA_XATTR_DIGSIG,
59 IMA_XATTR_DIGEST_NG,
60 IMA_XATTR_LAST
61};
62
63struct evm_ima_xattr_data {
64 u8 type;
65 u8 digest[SHA1_DIGEST_SIZE];
66} __packed;
67
68#define IMA_MAX_DIGEST_SIZE 64
69
70struct ima_digest_data {
71 u8 algo;
72 u8 length;
73 union {
74 struct {
75 u8 unused;
76 u8 type;
77 } sha1;
78 struct {
79 u8 type;
80 u8 algo;
81 } ng;
82 u8 data[2];
83 } xattr;
84 u8 digest[0];
85} __packed;
86
87/*
88 * signature format v2 - for using with asymmetric keys
89 */
90struct signature_v2_hdr {
91 uint8_t type; /* xattr type */
92 uint8_t version; /* signature format version */
93 uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */
94 uint32_t keyid; /* IMA key identifier - not X509/PGP specific */
95 uint16_t sig_size; /* signature size */
96 uint8_t sig[0]; /* signature payload */
97} __packed;
98
99/* integrity data associated with an inode */
100struct integrity_iint_cache {
101 struct rb_node rb_node; /* rooted in integrity_iint_tree */
102 struct inode *inode; /* back pointer to inode in question */
103 u64 version; /* track inode changes */
104 unsigned long flags;
105 enum integrity_status ima_file_status:4;
106 enum integrity_status ima_mmap_status:4;
107 enum integrity_status ima_bprm_status:4;
108 enum integrity_status ima_read_status:4;
109 enum integrity_status evm_status:4;
110 struct ima_digest_data *ima_hash;
111};
112
113/* rbtree tree calls to lookup, insert, delete
114 * integrity data associated with an inode.
115 */
116struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
117
118int integrity_kernel_read(struct file *file, loff_t offset,
119 char *addr, unsigned long count);
120int __init integrity_read_file(const char *path, char **data);
121
122#define INTEGRITY_KEYRING_EVM 0
123#define INTEGRITY_KEYRING_IMA 1
124#define INTEGRITY_KEYRING_MODULE 2
125#define INTEGRITY_KEYRING_MAX 3
126
127#ifdef CONFIG_INTEGRITY_SIGNATURE
128
129int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
130 const char *digest, int digestlen);
131
132int __init integrity_init_keyring(const unsigned int id);
133int __init integrity_load_x509(const unsigned int id, const char *path);
134#else
135
136static inline int integrity_digsig_verify(const unsigned int id,
137 const char *sig, int siglen,
138 const char *digest, int digestlen)
139{
140 return -EOPNOTSUPP;
141}
142
143static inline int integrity_init_keyring(const unsigned int id)
144{
145 return 0;
146}
147#endif /* CONFIG_INTEGRITY_SIGNATURE */
148
149#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
150int asymmetric_verify(struct key *keyring, const char *sig,
151 int siglen, const char *data, int datalen);
152#else
153static inline int asymmetric_verify(struct key *keyring, const char *sig,
154 int siglen, const char *data, int datalen)
155{
156 return -EOPNOTSUPP;
157}
158#endif
159
160#ifdef CONFIG_IMA_LOAD_X509
161void __init ima_load_x509(void);
162#else
163static inline void ima_load_x509(void)
164{
165}
166#endif
167
168#ifdef CONFIG_EVM_LOAD_X509
169void __init evm_load_x509(void);
170#else
171static inline void evm_load_x509(void)
172{
173}
174#endif
175
176#ifdef CONFIG_INTEGRITY_AUDIT
177/* declarations */
178void integrity_audit_msg(int audit_msgno, struct inode *inode,
179 const unsigned char *fname, const char *op,
180 const char *cause, int result, int info);
181#else
182static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
183 const unsigned char *fname,
184 const char *op, const char *cause,
185 int result, int info)
186{
187}
188#endif
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_DIGSIG_REQUIRED 0x01000000
34#define IMA_PERMIT_DIRECTIO 0x02000000
35#define IMA_NEW_FILE 0x04000000
36#define EVM_IMMUTABLE_DIGSIG 0x08000000
37#define IMA_FAIL_UNVERIFIABLE_SIGS 0x10000000
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_CREDS_APPRAISE 0x00100000
55#define IMA_CREDS_APPRAISED 0x00200000
56#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
57 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \
58 IMA_CREDS_APPRAISE)
59#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
60 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \
61 IMA_CREDS_APPRAISED)
62
63/* iint cache atomic_flags */
64#define IMA_CHANGE_XATTR 0
65#define IMA_UPDATE_XATTR 1
66#define IMA_CHANGE_ATTR 2
67#define IMA_DIGSIG 3
68#define IMA_MUST_MEASURE 4
69
70enum evm_ima_xattr_type {
71 IMA_XATTR_DIGEST = 0x01,
72 EVM_XATTR_HMAC,
73 EVM_IMA_XATTR_DIGSIG,
74 IMA_XATTR_DIGEST_NG,
75 EVM_XATTR_PORTABLE_DIGSIG,
76 IMA_XATTR_LAST
77};
78
79struct evm_ima_xattr_data {
80 u8 type;
81 u8 digest[SHA1_DIGEST_SIZE];
82} __packed;
83
84#define IMA_MAX_DIGEST_SIZE 64
85
86struct ima_digest_data {
87 u8 algo;
88 u8 length;
89 union {
90 struct {
91 u8 unused;
92 u8 type;
93 } sha1;
94 struct {
95 u8 type;
96 u8 algo;
97 } ng;
98 u8 data[2];
99 } xattr;
100 u8 digest[0];
101} __packed;
102
103/*
104 * signature format v2 - for using with asymmetric keys
105 */
106struct signature_v2_hdr {
107 uint8_t type; /* xattr type */
108 uint8_t version; /* signature format version */
109 uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */
110 __be32 keyid; /* IMA key identifier - not X509/PGP specific */
111 __be16 sig_size; /* signature size */
112 uint8_t sig[0]; /* signature payload */
113} __packed;
114
115/* integrity data associated with an inode */
116struct integrity_iint_cache {
117 struct rb_node rb_node; /* rooted in integrity_iint_tree */
118 struct mutex mutex; /* protects: version, flags, digest */
119 struct inode *inode; /* back pointer to inode in question */
120 u64 version; /* track inode changes */
121 unsigned long flags;
122 unsigned long measured_pcrs;
123 unsigned long atomic_flags;
124 enum integrity_status ima_file_status:4;
125 enum integrity_status ima_mmap_status:4;
126 enum integrity_status ima_bprm_status:4;
127 enum integrity_status ima_read_status:4;
128 enum integrity_status ima_creds_status:4;
129 enum integrity_status evm_status:4;
130 struct ima_digest_data *ima_hash;
131};
132
133/* rbtree tree calls to lookup, insert, delete
134 * integrity data associated with an inode.
135 */
136struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
137
138int integrity_kernel_read(struct file *file, loff_t offset,
139 void *addr, unsigned long count);
140
141#define INTEGRITY_KEYRING_EVM 0
142#define INTEGRITY_KEYRING_IMA 1
143#define INTEGRITY_KEYRING_MODULE 2
144#define INTEGRITY_KEYRING_MAX 3
145
146#ifdef CONFIG_INTEGRITY_SIGNATURE
147
148int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
149 const char *digest, int digestlen);
150
151int __init integrity_init_keyring(const unsigned int id);
152int __init integrity_load_x509(const unsigned int id, const char *path);
153#else
154
155static inline int integrity_digsig_verify(const unsigned int id,
156 const char *sig, int siglen,
157 const char *digest, int digestlen)
158{
159 return -EOPNOTSUPP;
160}
161
162static inline int integrity_init_keyring(const unsigned int id)
163{
164 return 0;
165}
166#endif /* CONFIG_INTEGRITY_SIGNATURE */
167
168#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
169int asymmetric_verify(struct key *keyring, const char *sig,
170 int siglen, const char *data, int datalen);
171#else
172static inline int asymmetric_verify(struct key *keyring, const char *sig,
173 int siglen, const char *data, int datalen)
174{
175 return -EOPNOTSUPP;
176}
177#endif
178
179#ifdef CONFIG_IMA_LOAD_X509
180void __init ima_load_x509(void);
181#else
182static inline void ima_load_x509(void)
183{
184}
185#endif
186
187#ifdef CONFIG_EVM_LOAD_X509
188void __init evm_load_x509(void);
189#else
190static inline void evm_load_x509(void)
191{
192}
193#endif
194
195#ifdef CONFIG_INTEGRITY_AUDIT
196/* declarations */
197void integrity_audit_msg(int audit_msgno, struct inode *inode,
198 const unsigned char *fname, const char *op,
199 const char *cause, int result, int info);
200#else
201static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
202 const unsigned char *fname,
203 const char *op, const char *cause,
204 int result, int info)
205{
206}
207#endif