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_MODULE_APPRAISE 0x00004000
49 #define IMA_MODULE_APPRAISED 0x00008000
50 #define IMA_FIRMWARE_APPRAISE 0x00010000
51 #define IMA_FIRMWARE_APPRAISED 0x00020000
52 #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
53 IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE | \
54 IMA_FIRMWARE_APPRAISE)
55 #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
56 IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED | \
57 IMA_FIRMWARE_APPRAISED)
58
59 enum evm_ima_xattr_type {
60 IMA_XATTR_DIGEST = 0x01,
61 EVM_XATTR_HMAC,
62 EVM_IMA_XATTR_DIGSIG,
63 IMA_XATTR_DIGEST_NG,
64 IMA_XATTR_LAST
65 };
66
67 struct evm_ima_xattr_data {
68 u8 type;
69 u8 digest[SHA1_DIGEST_SIZE];
70 } __packed;
71
72 #define IMA_MAX_DIGEST_SIZE 64
73
74 struct ima_digest_data {
75 u8 algo;
76 u8 length;
77 union {
78 struct {
79 u8 unused;
80 u8 type;
81 } sha1;
82 struct {
83 u8 type;
84 u8 algo;
85 } ng;
86 u8 data[2];
87 } xattr;
88 u8 digest[0];
89 } __packed;
90
91 /*
92 * signature format v2 - for using with asymmetric keys
93 */
94 struct signature_v2_hdr {
95 uint8_t type; /* xattr type */
96 uint8_t version; /* signature format version */
97 uint8_t hash_algo; /* Digest algorithm [enum pkey_hash_algo] */
98 uint32_t keyid; /* IMA key identifier - not X509/PGP specific */
99 uint16_t sig_size; /* signature size */
100 uint8_t sig[0]; /* signature payload */
101 } __packed;
102
103 /* integrity data associated with an inode */
104 struct integrity_iint_cache {
105 struct rb_node rb_node; /* rooted in integrity_iint_tree */
106 struct inode *inode; /* back pointer to inode in question */
107 u64 version; /* track inode changes */
108 unsigned long flags;
109 enum integrity_status ima_file_status:4;
110 enum integrity_status ima_mmap_status:4;
111 enum integrity_status ima_bprm_status:4;
112 enum integrity_status ima_module_status:4;
113 enum integrity_status ima_firmware_status:4;
114 enum integrity_status evm_status:4;
115 struct ima_digest_data *ima_hash;
116 };
117
118 /* rbtree tree calls to lookup, insert, delete
119 * integrity data associated with an inode.
120 */
121 struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
122
123 int integrity_kernel_read(struct file *file, loff_t offset,
124 char *addr, unsigned long count);
125 int __init integrity_read_file(const char *path, char **data);
126
127 #define INTEGRITY_KEYRING_EVM 0
128 #define INTEGRITY_KEYRING_MODULE 1
129 #define INTEGRITY_KEYRING_IMA 2
130 #define INTEGRITY_KEYRING_MAX 3
131
132 #ifdef CONFIG_INTEGRITY_SIGNATURE
133
134 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
135 const char *digest, int digestlen);
136
137 int __init integrity_init_keyring(const unsigned int id);
138 int __init integrity_load_x509(const unsigned int id, const char *path);
139 #else
140
integrity_digsig_verify(const unsigned int id,const char * sig,int siglen,const char * digest,int digestlen)141 static inline int integrity_digsig_verify(const unsigned int id,
142 const char *sig, int siglen,
143 const char *digest, int digestlen)
144 {
145 return -EOPNOTSUPP;
146 }
147
integrity_init_keyring(const unsigned int id)148 static inline int integrity_init_keyring(const unsigned int id)
149 {
150 return 0;
151 }
152
153 #endif /* CONFIG_INTEGRITY_SIGNATURE */
154
155 #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
156 int asymmetric_verify(struct key *keyring, const char *sig,
157 int siglen, const char *data, int datalen);
158 #else
asymmetric_verify(struct key * keyring,const char * sig,int siglen,const char * data,int datalen)159 static inline int asymmetric_verify(struct key *keyring, const char *sig,
160 int siglen, const char *data, int datalen)
161 {
162 return -EOPNOTSUPP;
163 }
164 #endif
165
166 #ifdef CONFIG_IMA_LOAD_X509
167 void __init ima_load_x509(void);
168 #else
ima_load_x509(void)169 static inline void ima_load_x509(void)
170 {
171 }
172 #endif
173
174 #ifdef CONFIG_INTEGRITY_AUDIT
175 /* declarations */
176 void integrity_audit_msg(int audit_msgno, struct inode *inode,
177 const unsigned char *fname, const char *op,
178 const char *cause, int result, int info);
179 #else
integrity_audit_msg(int audit_msgno,struct inode * inode,const unsigned char * fname,const char * op,const char * cause,int result,int info)180 static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
181 const unsigned char *fname,
182 const char *op, const char *cause,
183 int result, int info)
184 {
185 }
186 #endif
187