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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_ACTION_RULE_FLAGS 0x06000000
32#define IMA_DIGSIG 0x01000000
33#define IMA_DIGSIG_REQUIRED 0x02000000
34#define IMA_PERMIT_DIRECTIO 0x04000000
35#define IMA_NEW_FILE 0x08000000
36
37#define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
38 IMA_APPRAISE_SUBMASK)
39#define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
40 IMA_COLLECTED | IMA_APPRAISED_SUBMASK)
41
42/* iint subaction appraise cache flags */
43#define IMA_FILE_APPRAISE 0x00000100
44#define IMA_FILE_APPRAISED 0x00000200
45#define IMA_MMAP_APPRAISE 0x00000400
46#define IMA_MMAP_APPRAISED 0x00000800
47#define IMA_BPRM_APPRAISE 0x00001000
48#define IMA_BPRM_APPRAISED 0x00002000
49#define IMA_READ_APPRAISE 0x00004000
50#define IMA_READ_APPRAISED 0x00008000
51#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
52 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE)
53#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
54 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED)
55
56enum evm_ima_xattr_type {
57 IMA_XATTR_DIGEST = 0x01,
58 EVM_XATTR_HMAC,
59 EVM_IMA_XATTR_DIGSIG,
60 IMA_XATTR_DIGEST_NG,
61 IMA_XATTR_LAST
62};
63
64struct evm_ima_xattr_data {
65 u8 type;
66 u8 digest[SHA1_DIGEST_SIZE];
67} __packed;
68
69#define IMA_MAX_DIGEST_SIZE 64
70
71struct ima_digest_data {
72 u8 algo;
73 u8 length;
74 union {
75 struct {
76 u8 unused;
77 u8 type;
78 } sha1;
79 struct {
80 u8 type;
81 u8 algo;
82 } ng;
83 u8 data[2];
84 } xattr;
85 u8 digest[0];
86} __packed;
87
88/*
89 * signature format v2 - for using with asymmetric keys
90 */
91struct signature_v2_hdr {
92 uint8_t type; /* xattr type */
93 uint8_t version; /* signature format version */
94 uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */
95 uint32_t keyid; /* IMA key identifier - not X509/PGP specific */
96 uint16_t sig_size; /* signature size */
97 uint8_t sig[0]; /* signature payload */
98} __packed;
99
100/* integrity data associated with an inode */
101struct integrity_iint_cache {
102 struct rb_node rb_node; /* rooted in integrity_iint_tree */
103 struct inode *inode; /* back pointer to inode in question */
104 u64 version; /* track inode changes */
105 unsigned long flags;
106 unsigned long measured_pcrs;
107 enum integrity_status ima_file_status:4;
108 enum integrity_status ima_mmap_status:4;
109 enum integrity_status ima_bprm_status:4;
110 enum integrity_status ima_read_status:4;
111 enum integrity_status evm_status:4;
112 struct ima_digest_data *ima_hash;
113};
114
115/* rbtree tree calls to lookup, insert, delete
116 * integrity data associated with an inode.
117 */
118struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
119
120int integrity_kernel_read(struct file *file, loff_t offset,
121 char *addr, unsigned long count);
122int __init integrity_read_file(const char *path, char **data);
123
124#define INTEGRITY_KEYRING_EVM 0
125#define INTEGRITY_KEYRING_IMA 1
126#define INTEGRITY_KEYRING_MODULE 2
127#define INTEGRITY_KEYRING_MAX 3
128
129#ifdef CONFIG_INTEGRITY_SIGNATURE
130
131int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
132 const char *digest, int digestlen);
133
134int __init integrity_init_keyring(const unsigned int id);
135int __init integrity_load_x509(const unsigned int id, const char *path);
136#else
137
138static inline int integrity_digsig_verify(const unsigned int id,
139 const char *sig, int siglen,
140 const char *digest, int digestlen)
141{
142 return -EOPNOTSUPP;
143}
144
145static inline int integrity_init_keyring(const unsigned int id)
146{
147 return 0;
148}
149#endif /* CONFIG_INTEGRITY_SIGNATURE */
150
151#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
152int asymmetric_verify(struct key *keyring, const char *sig,
153 int siglen, const char *data, int datalen);
154#else
155static inline int asymmetric_verify(struct key *keyring, const char *sig,
156 int siglen, const char *data, int datalen)
157{
158 return -EOPNOTSUPP;
159}
160#endif
161
162#ifdef CONFIG_IMA_LOAD_X509
163void __init ima_load_x509(void);
164#else
165static inline void ima_load_x509(void)
166{
167}
168#endif
169
170#ifdef CONFIG_EVM_LOAD_X509
171void __init evm_load_x509(void);
172#else
173static inline void evm_load_x509(void)
174{
175}
176#endif
177
178#ifdef CONFIG_INTEGRITY_AUDIT
179/* declarations */
180void integrity_audit_msg(int audit_msgno, struct inode *inode,
181 const unsigned char *fname, const char *op,
182 const char *cause, int result, int info);
183#else
184static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
185 const unsigned char *fname,
186 const char *op, const char *cause,
187 int result, int info)
188{
189}
190#endif