2 * Copyright (C) 2009-2010 IBM Corporation
5 * Mimi Zohar <zohar@us.ibm.com>
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
14 #include <linux/types.h>
15 #include <linux/integrity.h>
16 #include <crypto/sha.h>
17 #include <linux/key.h>
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
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
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)
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 | \
59 #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
60 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \
63 /* iint cache atomic_flags */
64 #define IMA_CHANGE_XATTR 0
65 #define IMA_UPDATE_XATTR 1
66 #define IMA_CHANGE_ATTR 2
68 #define IMA_MUST_MEASURE 4
70 enum evm_ima_xattr_type {
71 IMA_XATTR_DIGEST = 0x01,
75 EVM_XATTR_PORTABLE_DIGSIG,
79 struct evm_ima_xattr_data {
81 u8 digest[SHA1_DIGEST_SIZE];
84 #define IMA_MAX_DIGEST_SIZE 64
86 struct ima_digest_data {
104 * signature format v2 - for using with asymmetric keys
106 struct 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 */
115 /* integrity data associated with an inode */
116 struct 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 */
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;
133 /* rbtree tree calls to lookup, insert, delete
134 * integrity data associated with an inode.
136 struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
138 int integrity_kernel_read(struct file *file, loff_t offset,
139 void *addr, unsigned long count);
141 #define INTEGRITY_KEYRING_EVM 0
142 #define INTEGRITY_KEYRING_IMA 1
143 #define INTEGRITY_KEYRING_MODULE 2
144 #define INTEGRITY_KEYRING_MAX 3
146 extern struct dentry *integrity_dir;
148 #ifdef CONFIG_INTEGRITY_SIGNATURE
150 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
151 const char *digest, int digestlen);
153 int __init integrity_init_keyring(const unsigned int id);
154 int __init integrity_load_x509(const unsigned int id, const char *path);
157 static inline int integrity_digsig_verify(const unsigned int id,
158 const char *sig, int siglen,
159 const char *digest, int digestlen)
164 static inline int integrity_init_keyring(const unsigned int id)
168 #endif /* CONFIG_INTEGRITY_SIGNATURE */
170 #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
171 int asymmetric_verify(struct key *keyring, const char *sig,
172 int siglen, const char *data, int datalen);
174 static inline int asymmetric_verify(struct key *keyring, const char *sig,
175 int siglen, const char *data, int datalen)
181 #ifdef CONFIG_IMA_LOAD_X509
182 void __init ima_load_x509(void);
184 static inline void ima_load_x509(void)
189 #ifdef CONFIG_EVM_LOAD_X509
190 void __init evm_load_x509(void);
192 static inline void evm_load_x509(void)
197 #ifdef CONFIG_INTEGRITY_AUDIT
199 void integrity_audit_msg(int audit_msgno, struct inode *inode,
200 const unsigned char *fname, const char *op,
201 const char *cause, int result, int info);
203 static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
204 const unsigned char *fname,
205 const char *op, const char *cause,
206 int result, int info)