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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2009-2010 IBM Corporation
4 *
5 * Authors:
6 * Mimi Zohar <zohar@us.ibm.com>
7 */
8
9#include <linux/types.h>
10#include <linux/integrity.h>
11#include <crypto/sha.h>
12#include <linux/key.h>
13#include <linux/audit.h>
14
15/* iint action cache flags */
16#define IMA_MEASURE 0x00000001
17#define IMA_MEASURED 0x00000002
18#define IMA_APPRAISE 0x00000004
19#define IMA_APPRAISED 0x00000008
20/*#define IMA_COLLECT 0x00000010 do not use this flag */
21#define IMA_COLLECTED 0x00000020
22#define IMA_AUDIT 0x00000040
23#define IMA_AUDITED 0x00000080
24#define IMA_HASH 0x00000100
25#define IMA_HASHED 0x00000200
26
27/* iint cache flags */
28#define IMA_ACTION_FLAGS 0xff000000
29#define IMA_DIGSIG_REQUIRED 0x01000000
30#define IMA_PERMIT_DIRECTIO 0x02000000
31#define IMA_NEW_FILE 0x04000000
32#define EVM_IMMUTABLE_DIGSIG 0x08000000
33#define IMA_FAIL_UNVERIFIABLE_SIGS 0x10000000
34
35#define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
36 IMA_HASH | IMA_APPRAISE_SUBMASK)
37#define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
38 IMA_HASHED | IMA_COLLECTED | \
39 IMA_APPRAISED_SUBMASK)
40
41/* iint subaction appraise cache flags */
42#define IMA_FILE_APPRAISE 0x00001000
43#define IMA_FILE_APPRAISED 0x00002000
44#define IMA_MMAP_APPRAISE 0x00004000
45#define IMA_MMAP_APPRAISED 0x00008000
46#define IMA_BPRM_APPRAISE 0x00010000
47#define IMA_BPRM_APPRAISED 0x00020000
48#define IMA_READ_APPRAISE 0x00040000
49#define IMA_READ_APPRAISED 0x00080000
50#define IMA_CREDS_APPRAISE 0x00100000
51#define IMA_CREDS_APPRAISED 0x00200000
52#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
53 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \
54 IMA_CREDS_APPRAISE)
55#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
56 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \
57 IMA_CREDS_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 ima_creds_status:4;
125 enum integrity_status evm_status:4;
126 struct ima_digest_data *ima_hash;
127};
128
129/* rbtree tree calls to lookup, insert, delete
130 * integrity data associated with an inode.
131 */
132struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
133
134int integrity_kernel_read(struct file *file, loff_t offset,
135 void *addr, unsigned long count);
136
137#define INTEGRITY_KEYRING_EVM 0
138#define INTEGRITY_KEYRING_IMA 1
139#define INTEGRITY_KEYRING_PLATFORM 2
140#define INTEGRITY_KEYRING_MAX 3
141
142extern struct dentry *integrity_dir;
143
144#ifdef CONFIG_INTEGRITY_SIGNATURE
145
146int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
147 const char *digest, int digestlen);
148
149int __init integrity_init_keyring(const unsigned int id);
150int __init integrity_load_x509(const unsigned int id, const char *path);
151int __init integrity_load_cert(const unsigned int id, const char *source,
152 const void *data, size_t len, key_perm_t perm);
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
167static inline int __init integrity_load_cert(const unsigned int id,
168 const char *source,
169 const void *data, size_t len,
170 key_perm_t perm)
171{
172 return 0;
173}
174#endif /* CONFIG_INTEGRITY_SIGNATURE */
175
176#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
177int asymmetric_verify(struct key *keyring, const char *sig,
178 int siglen, const char *data, int datalen);
179#else
180static inline int asymmetric_verify(struct key *keyring, const char *sig,
181 int siglen, const char *data, int datalen)
182{
183 return -EOPNOTSUPP;
184}
185#endif
186
187#ifdef CONFIG_IMA_LOAD_X509
188void __init ima_load_x509(void);
189#else
190static inline void ima_load_x509(void)
191{
192}
193#endif
194
195#ifdef CONFIG_EVM_LOAD_X509
196void __init evm_load_x509(void);
197#else
198static inline void evm_load_x509(void)
199{
200}
201#endif
202
203#ifdef CONFIG_INTEGRITY_AUDIT
204/* declarations */
205void integrity_audit_msg(int audit_msgno, struct inode *inode,
206 const unsigned char *fname, const char *op,
207 const char *cause, int result, int info);
208
209static inline struct audit_buffer *
210integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
211{
212 return audit_log_start(ctx, gfp_mask, type);
213}
214
215#else
216static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
217 const unsigned char *fname,
218 const char *op, const char *cause,
219 int result, int info)
220{
221}
222
223static inline struct audit_buffer *
224integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
225{
226 return NULL;
227}
228
229#endif
230
231#ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING
232void __init add_to_platform_keyring(const char *source, const void *data,
233 size_t len);
234#else
235static inline void __init add_to_platform_keyring(const char *source,
236 const void *data, size_t len)
237{
238}
239#endif