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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#define IMA_MODSIG_ALLOWED 0x20000000
35#define IMA_CHECK_BLACKLIST 0x40000000
36
37#define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
38 IMA_HASH | IMA_APPRAISE_SUBMASK)
39#define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
40 IMA_HASHED | IMA_COLLECTED | \
41 IMA_APPRAISED_SUBMASK)
42
43/* iint subaction appraise cache flags */
44#define IMA_FILE_APPRAISE 0x00001000
45#define IMA_FILE_APPRAISED 0x00002000
46#define IMA_MMAP_APPRAISE 0x00004000
47#define IMA_MMAP_APPRAISED 0x00008000
48#define IMA_BPRM_APPRAISE 0x00010000
49#define IMA_BPRM_APPRAISED 0x00020000
50#define IMA_READ_APPRAISE 0x00040000
51#define IMA_READ_APPRAISED 0x00080000
52#define IMA_CREDS_APPRAISE 0x00100000
53#define IMA_CREDS_APPRAISED 0x00200000
54#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
55 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \
56 IMA_CREDS_APPRAISE)
57#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
58 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \
59 IMA_CREDS_APPRAISED)
60
61/* iint cache atomic_flags */
62#define IMA_CHANGE_XATTR 0
63#define IMA_UPDATE_XATTR 1
64#define IMA_CHANGE_ATTR 2
65#define IMA_DIGSIG 3
66#define IMA_MUST_MEASURE 4
67
68enum evm_ima_xattr_type {
69 IMA_XATTR_DIGEST = 0x01,
70 EVM_XATTR_HMAC,
71 EVM_IMA_XATTR_DIGSIG,
72 IMA_XATTR_DIGEST_NG,
73 EVM_XATTR_PORTABLE_DIGSIG,
74 IMA_XATTR_LAST
75};
76
77struct evm_ima_xattr_data {
78 u8 type;
79 u8 data[];
80} __packed;
81
82/* Only used in the EVM HMAC code. */
83struct evm_xattr {
84 struct evm_ima_xattr_data data;
85 u8 digest[SHA1_DIGEST_SIZE];
86} __packed;
87
88#define IMA_MAX_DIGEST_SIZE 64
89
90struct ima_digest_data {
91 u8 algo;
92 u8 length;
93 union {
94 struct {
95 u8 unused;
96 u8 type;
97 } sha1;
98 struct {
99 u8 type;
100 u8 algo;
101 } ng;
102 u8 data[2];
103 } xattr;
104 u8 digest[0];
105} __packed;
106
107/*
108 * signature format v2 - for using with asymmetric keys
109 */
110struct signature_v2_hdr {
111 uint8_t type; /* xattr type */
112 uint8_t version; /* signature format version */
113 uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */
114 __be32 keyid; /* IMA key identifier - not X509/PGP specific */
115 __be16 sig_size; /* signature size */
116 uint8_t sig[0]; /* signature payload */
117} __packed;
118
119/* integrity data associated with an inode */
120struct integrity_iint_cache {
121 struct rb_node rb_node; /* rooted in integrity_iint_tree */
122 struct mutex mutex; /* protects: version, flags, digest */
123 struct inode *inode; /* back pointer to inode in question */
124 u64 version; /* track inode changes */
125 unsigned long flags;
126 unsigned long measured_pcrs;
127 unsigned long atomic_flags;
128 enum integrity_status ima_file_status:4;
129 enum integrity_status ima_mmap_status:4;
130 enum integrity_status ima_bprm_status:4;
131 enum integrity_status ima_read_status:4;
132 enum integrity_status ima_creds_status:4;
133 enum integrity_status evm_status:4;
134 struct ima_digest_data *ima_hash;
135};
136
137/* rbtree tree calls to lookup, insert, delete
138 * integrity data associated with an inode.
139 */
140struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
141
142int integrity_kernel_read(struct file *file, loff_t offset,
143 void *addr, unsigned long count);
144
145#define INTEGRITY_KEYRING_EVM 0
146#define INTEGRITY_KEYRING_IMA 1
147#define INTEGRITY_KEYRING_PLATFORM 2
148#define INTEGRITY_KEYRING_MAX 3
149
150extern struct dentry *integrity_dir;
151
152struct modsig;
153
154#ifdef CONFIG_INTEGRITY_SIGNATURE
155
156int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
157 const char *digest, int digestlen);
158int integrity_modsig_verify(unsigned int id, const struct modsig *modsig);
159
160int __init integrity_init_keyring(const unsigned int id);
161int __init integrity_load_x509(const unsigned int id, const char *path);
162int __init integrity_load_cert(const unsigned int id, const char *source,
163 const void *data, size_t len, key_perm_t perm);
164#else
165
166static inline int integrity_digsig_verify(const unsigned int id,
167 const char *sig, int siglen,
168 const char *digest, int digestlen)
169{
170 return -EOPNOTSUPP;
171}
172
173static inline int integrity_modsig_verify(unsigned int id,
174 const struct modsig *modsig)
175{
176 return -EOPNOTSUPP;
177}
178
179static inline int integrity_init_keyring(const unsigned int id)
180{
181 return 0;
182}
183
184static inline int __init integrity_load_cert(const unsigned int id,
185 const char *source,
186 const void *data, size_t len,
187 key_perm_t perm)
188{
189 return 0;
190}
191#endif /* CONFIG_INTEGRITY_SIGNATURE */
192
193#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
194int asymmetric_verify(struct key *keyring, const char *sig,
195 int siglen, const char *data, int datalen);
196#else
197static inline int asymmetric_verify(struct key *keyring, const char *sig,
198 int siglen, const char *data, int datalen)
199{
200 return -EOPNOTSUPP;
201}
202#endif
203
204#ifdef CONFIG_IMA_APPRAISE_MODSIG
205int ima_modsig_verify(struct key *keyring, const struct modsig *modsig);
206#else
207static inline int ima_modsig_verify(struct key *keyring,
208 const struct modsig *modsig)
209{
210 return -EOPNOTSUPP;
211}
212#endif
213
214#ifdef CONFIG_IMA_LOAD_X509
215void __init ima_load_x509(void);
216#else
217static inline void ima_load_x509(void)
218{
219}
220#endif
221
222#ifdef CONFIG_EVM_LOAD_X509
223void __init evm_load_x509(void);
224#else
225static inline void evm_load_x509(void)
226{
227}
228#endif
229
230#ifdef CONFIG_INTEGRITY_AUDIT
231/* declarations */
232void integrity_audit_msg(int audit_msgno, struct inode *inode,
233 const unsigned char *fname, const char *op,
234 const char *cause, int result, int info);
235
236static inline struct audit_buffer *
237integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
238{
239 return audit_log_start(ctx, gfp_mask, type);
240}
241
242#else
243static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
244 const unsigned char *fname,
245 const char *op, const char *cause,
246 int result, int info)
247{
248}
249
250static inline struct audit_buffer *
251integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
252{
253 return NULL;
254}
255
256#endif
257
258#ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING
259void __init add_to_platform_keyring(const char *source, const void *data,
260 size_t len);
261#else
262static inline void __init add_to_platform_keyring(const char *source,
263 const void *data, size_t len)
264{
265}
266#endif