Loading...
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_READ_APPRAISE 0x00004000
49#define IMA_READ_APPRAISED 0x00008000
50#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
51 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE)
52#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
53 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED)
54
55enum evm_ima_xattr_type {
56 IMA_XATTR_DIGEST = 0x01,
57 EVM_XATTR_HMAC,
58 EVM_IMA_XATTR_DIGSIG,
59 IMA_XATTR_DIGEST_NG,
60 IMA_XATTR_LAST
61};
62
63struct evm_ima_xattr_data {
64 u8 type;
65 u8 digest[SHA1_DIGEST_SIZE];
66} __packed;
67
68#define IMA_MAX_DIGEST_SIZE 64
69
70struct ima_digest_data {
71 u8 algo;
72 u8 length;
73 union {
74 struct {
75 u8 unused;
76 u8 type;
77 } sha1;
78 struct {
79 u8 type;
80 u8 algo;
81 } ng;
82 u8 data[2];
83 } xattr;
84 u8 digest[0];
85} __packed;
86
87/*
88 * signature format v2 - for using with asymmetric keys
89 */
90struct signature_v2_hdr {
91 uint8_t type; /* xattr type */
92 uint8_t version; /* signature format version */
93 uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */
94 uint32_t keyid; /* IMA key identifier - not X509/PGP specific */
95 uint16_t sig_size; /* signature size */
96 uint8_t sig[0]; /* signature payload */
97} __packed;
98
99/* integrity data associated with an inode */
100struct integrity_iint_cache {
101 struct rb_node rb_node; /* rooted in integrity_iint_tree */
102 struct inode *inode; /* back pointer to inode in question */
103 u64 version; /* track inode changes */
104 unsigned long flags;
105 enum integrity_status ima_file_status:4;
106 enum integrity_status ima_mmap_status:4;
107 enum integrity_status ima_bprm_status:4;
108 enum integrity_status ima_read_status:4;
109 enum integrity_status evm_status:4;
110 struct ima_digest_data *ima_hash;
111};
112
113/* rbtree tree calls to lookup, insert, delete
114 * integrity data associated with an inode.
115 */
116struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
117
118int integrity_kernel_read(struct file *file, loff_t offset,
119 char *addr, unsigned long count);
120int __init integrity_read_file(const char *path, char **data);
121
122#define INTEGRITY_KEYRING_EVM 0
123#define INTEGRITY_KEYRING_IMA 1
124#define INTEGRITY_KEYRING_MODULE 2
125#define INTEGRITY_KEYRING_MAX 3
126
127#ifdef CONFIG_INTEGRITY_SIGNATURE
128
129int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
130 const char *digest, int digestlen);
131
132int __init integrity_init_keyring(const unsigned int id);
133int __init integrity_load_x509(const unsigned int id, const char *path);
134#else
135
136static inline int integrity_digsig_verify(const unsigned int id,
137 const char *sig, int siglen,
138 const char *digest, int digestlen)
139{
140 return -EOPNOTSUPP;
141}
142
143static inline int integrity_init_keyring(const unsigned int id)
144{
145 return 0;
146}
147#endif /* CONFIG_INTEGRITY_SIGNATURE */
148
149#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
150int asymmetric_verify(struct key *keyring, const char *sig,
151 int siglen, const char *data, int datalen);
152#else
153static inline int asymmetric_verify(struct key *keyring, const char *sig,
154 int siglen, const char *data, int datalen)
155{
156 return -EOPNOTSUPP;
157}
158#endif
159
160#ifdef CONFIG_IMA_LOAD_X509
161void __init ima_load_x509(void);
162#else
163static inline void ima_load_x509(void)
164{
165}
166#endif
167
168#ifdef CONFIG_EVM_LOAD_X509
169void __init evm_load_x509(void);
170#else
171static inline void evm_load_x509(void)
172{
173}
174#endif
175
176#ifdef CONFIG_INTEGRITY_AUDIT
177/* declarations */
178void integrity_audit_msg(int audit_msgno, struct inode *inode,
179 const unsigned char *fname, const char *op,
180 const char *cause, int result, int info);
181#else
182static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
183 const unsigned char *fname,
184 const char *op, const char *cause,
185 int result, int info)
186{
187}
188#endif
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#ifdef pr_fmt
10#undef pr_fmt
11#endif
12
13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15#include <linux/types.h>
16#include <linux/integrity.h>
17#include <crypto/sha1.h>
18#include <crypto/hash.h>
19#include <linux/key.h>
20#include <linux/audit.h>
21
22/* iint action cache flags */
23#define IMA_MEASURE 0x00000001
24#define IMA_MEASURED 0x00000002
25#define IMA_APPRAISE 0x00000004
26#define IMA_APPRAISED 0x00000008
27/*#define IMA_COLLECT 0x00000010 do not use this flag */
28#define IMA_COLLECTED 0x00000020
29#define IMA_AUDIT 0x00000040
30#define IMA_AUDITED 0x00000080
31#define IMA_HASH 0x00000100
32#define IMA_HASHED 0x00000200
33
34/* iint policy rule cache flags */
35#define IMA_NONACTION_FLAGS 0xff000000
36#define IMA_DIGSIG_REQUIRED 0x01000000
37#define IMA_PERMIT_DIRECTIO 0x02000000
38#define IMA_NEW_FILE 0x04000000
39#define EVM_IMMUTABLE_DIGSIG 0x08000000
40#define IMA_FAIL_UNVERIFIABLE_SIGS 0x10000000
41#define IMA_MODSIG_ALLOWED 0x20000000
42#define IMA_CHECK_BLACKLIST 0x40000000
43#define IMA_VERITY_REQUIRED 0x80000000
44
45#define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
46 IMA_HASH | IMA_APPRAISE_SUBMASK)
47#define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
48 IMA_HASHED | IMA_COLLECTED | \
49 IMA_APPRAISED_SUBMASK)
50
51/* iint subaction appraise cache flags */
52#define IMA_FILE_APPRAISE 0x00001000
53#define IMA_FILE_APPRAISED 0x00002000
54#define IMA_MMAP_APPRAISE 0x00004000
55#define IMA_MMAP_APPRAISED 0x00008000
56#define IMA_BPRM_APPRAISE 0x00010000
57#define IMA_BPRM_APPRAISED 0x00020000
58#define IMA_READ_APPRAISE 0x00040000
59#define IMA_READ_APPRAISED 0x00080000
60#define IMA_CREDS_APPRAISE 0x00100000
61#define IMA_CREDS_APPRAISED 0x00200000
62#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
63 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \
64 IMA_CREDS_APPRAISE)
65#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
66 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \
67 IMA_CREDS_APPRAISED)
68
69/* iint cache atomic_flags */
70#define IMA_CHANGE_XATTR 0
71#define IMA_UPDATE_XATTR 1
72#define IMA_CHANGE_ATTR 2
73#define IMA_DIGSIG 3
74#define IMA_MUST_MEASURE 4
75
76enum evm_ima_xattr_type {
77 IMA_XATTR_DIGEST = 0x01,
78 EVM_XATTR_HMAC,
79 EVM_IMA_XATTR_DIGSIG,
80 IMA_XATTR_DIGEST_NG,
81 EVM_XATTR_PORTABLE_DIGSIG,
82 IMA_VERITY_DIGSIG,
83 IMA_XATTR_LAST
84};
85
86struct evm_ima_xattr_data {
87 u8 type;
88 u8 data[];
89} __packed;
90
91/* Only used in the EVM HMAC code. */
92struct evm_xattr {
93 struct evm_ima_xattr_data data;
94 u8 digest[SHA1_DIGEST_SIZE];
95} __packed;
96
97#define IMA_MAX_DIGEST_SIZE HASH_MAX_DIGESTSIZE
98
99struct ima_digest_data {
100 u8 algo;
101 u8 length;
102 union {
103 struct {
104 u8 unused;
105 u8 type;
106 } sha1;
107 struct {
108 u8 type;
109 u8 algo;
110 } ng;
111 u8 data[2];
112 } xattr;
113 u8 digest[];
114} __packed;
115
116/*
117 * Instead of wrapping the ima_digest_data struct inside a local structure
118 * with the maximum hash size, define ima_max_digest_data struct.
119 */
120struct ima_max_digest_data {
121 struct ima_digest_data hdr;
122 u8 digest[HASH_MAX_DIGESTSIZE];
123} __packed;
124
125/*
126 * signature header format v2 - for using with asymmetric keys
127 *
128 * The signature_v2_hdr struct includes a signature format version
129 * to simplify defining new signature formats.
130 *
131 * signature format:
132 * version 2: regular file data hash based signature
133 * version 3: struct ima_file_id data based signature
134 */
135struct signature_v2_hdr {
136 uint8_t type; /* xattr type */
137 uint8_t version; /* signature format version */
138 uint8_t hash_algo; /* Digest algorithm [enum hash_algo] */
139 __be32 keyid; /* IMA key identifier - not X509/PGP specific */
140 __be16 sig_size; /* signature size */
141 uint8_t sig[]; /* signature payload */
142} __packed;
143
144/*
145 * IMA signature version 3 disambiguates the data that is signed, by
146 * indirectly signing the hash of the ima_file_id structure data,
147 * containing either the fsverity_descriptor struct digest or, in the
148 * future, the regular IMA file hash.
149 *
150 * (The hash of the ima_file_id structure is only of the portion used.)
151 */
152struct ima_file_id {
153 __u8 hash_type; /* xattr type [enum evm_ima_xattr_type] */
154 __u8 hash_algorithm; /* Digest algorithm [enum hash_algo] */
155 __u8 hash[HASH_MAX_DIGESTSIZE];
156} __packed;
157
158/* integrity data associated with an inode */
159struct integrity_iint_cache {
160 struct rb_node rb_node; /* rooted in integrity_iint_tree */
161 struct mutex mutex; /* protects: version, flags, digest */
162 struct inode *inode; /* back pointer to inode in question */
163 u64 version; /* track inode changes */
164 unsigned long flags;
165 unsigned long measured_pcrs;
166 unsigned long atomic_flags;
167 unsigned long real_ino;
168 dev_t real_dev;
169 enum integrity_status ima_file_status:4;
170 enum integrity_status ima_mmap_status:4;
171 enum integrity_status ima_bprm_status:4;
172 enum integrity_status ima_read_status:4;
173 enum integrity_status ima_creds_status:4;
174 enum integrity_status evm_status:4;
175 struct ima_digest_data *ima_hash;
176};
177
178/* rbtree tree calls to lookup, insert, delete
179 * integrity data associated with an inode.
180 */
181struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
182
183int integrity_kernel_read(struct file *file, loff_t offset,
184 void *addr, unsigned long count);
185
186#define INTEGRITY_KEYRING_EVM 0
187#define INTEGRITY_KEYRING_IMA 1
188#define INTEGRITY_KEYRING_PLATFORM 2
189#define INTEGRITY_KEYRING_MACHINE 3
190#define INTEGRITY_KEYRING_MAX 4
191
192extern struct dentry *integrity_dir;
193
194struct modsig;
195
196#ifdef CONFIG_INTEGRITY_SIGNATURE
197
198int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
199 const char *digest, int digestlen);
200int integrity_modsig_verify(unsigned int id, const struct modsig *modsig);
201
202int __init integrity_init_keyring(const unsigned int id);
203int __init integrity_load_x509(const unsigned int id, const char *path);
204int __init integrity_load_cert(const unsigned int id, const char *source,
205 const void *data, size_t len, key_perm_t perm);
206#else
207
208static inline int integrity_digsig_verify(const unsigned int id,
209 const char *sig, int siglen,
210 const char *digest, int digestlen)
211{
212 return -EOPNOTSUPP;
213}
214
215static inline int integrity_modsig_verify(unsigned int id,
216 const struct modsig *modsig)
217{
218 return -EOPNOTSUPP;
219}
220
221static inline int integrity_init_keyring(const unsigned int id)
222{
223 return 0;
224}
225
226static inline int __init integrity_load_cert(const unsigned int id,
227 const char *source,
228 const void *data, size_t len,
229 key_perm_t perm)
230{
231 return 0;
232}
233#endif /* CONFIG_INTEGRITY_SIGNATURE */
234
235#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
236int asymmetric_verify(struct key *keyring, const char *sig,
237 int siglen, const char *data, int datalen);
238#else
239static inline int asymmetric_verify(struct key *keyring, const char *sig,
240 int siglen, const char *data, int datalen)
241{
242 return -EOPNOTSUPP;
243}
244#endif
245
246#ifdef CONFIG_IMA_APPRAISE_MODSIG
247int ima_modsig_verify(struct key *keyring, const struct modsig *modsig);
248#else
249static inline int ima_modsig_verify(struct key *keyring,
250 const struct modsig *modsig)
251{
252 return -EOPNOTSUPP;
253}
254#endif
255
256#ifdef CONFIG_IMA_LOAD_X509
257void __init ima_load_x509(void);
258#else
259static inline void ima_load_x509(void)
260{
261}
262#endif
263
264#ifdef CONFIG_EVM_LOAD_X509
265void __init evm_load_x509(void);
266#else
267static inline void evm_load_x509(void)
268{
269}
270#endif
271
272#ifdef CONFIG_INTEGRITY_AUDIT
273/* declarations */
274void integrity_audit_msg(int audit_msgno, struct inode *inode,
275 const unsigned char *fname, const char *op,
276 const char *cause, int result, int info);
277
278void integrity_audit_message(int audit_msgno, struct inode *inode,
279 const unsigned char *fname, const char *op,
280 const char *cause, int result, int info,
281 int errno);
282
283static inline struct audit_buffer *
284integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
285{
286 return audit_log_start(ctx, gfp_mask, type);
287}
288
289#else
290static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
291 const unsigned char *fname,
292 const char *op, const char *cause,
293 int result, int info)
294{
295}
296
297static inline void integrity_audit_message(int audit_msgno,
298 struct inode *inode,
299 const unsigned char *fname,
300 const char *op, const char *cause,
301 int result, int info, int errno)
302{
303}
304
305static inline struct audit_buffer *
306integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
307{
308 return NULL;
309}
310
311#endif
312
313#ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING
314void __init add_to_platform_keyring(const char *source, const void *data,
315 size_t len);
316#else
317static inline void __init add_to_platform_keyring(const char *source,
318 const void *data, size_t len)
319{
320}
321#endif
322
323#ifdef CONFIG_INTEGRITY_MACHINE_KEYRING
324void __init add_to_machine_keyring(const char *source, const void *data, size_t len);
325bool __init imputed_trust_enabled(void);
326#else
327static inline void __init add_to_machine_keyring(const char *source,
328 const void *data, size_t len)
329{
330}
331
332static inline bool __init imputed_trust_enabled(void)
333{
334 return false;
335}
336#endif