1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/* Signature verification
3 *
4 * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8#ifndef _LINUX_VERIFICATION_H
9#define _LINUX_VERIFICATION_H
10
11#include <linux/errno.h>
12#include <linux/types.h>
13
14/*
15 * Indicate that both builtin trusted keys and secondary trusted keys
16 * should be used.
17 */
18#define VERIFY_USE_SECONDARY_KEYRING ((struct key *)1UL)
19#define VERIFY_USE_PLATFORM_KEYRING  ((struct key *)2UL)
20
21static inline int system_keyring_id_check(u64 id)
22{
23	if (id > (unsigned long)VERIFY_USE_PLATFORM_KEYRING)
24		return -EINVAL;
25
26	return 0;
27}
28
29/*
30 * The use to which an asymmetric key is being put.
31 */
32enum key_being_used_for {
33	VERIFYING_MODULE_SIGNATURE,
34	VERIFYING_FIRMWARE_SIGNATURE,
35	VERIFYING_KEXEC_PE_SIGNATURE,
36	VERIFYING_KEY_SIGNATURE,
37	VERIFYING_KEY_SELF_SIGNATURE,
38	VERIFYING_UNSPECIFIED_SIGNATURE,
39	NR__KEY_BEING_USED_FOR
40};
41extern const char *const key_being_used_for[NR__KEY_BEING_USED_FOR];
42
43#ifdef CONFIG_SYSTEM_DATA_VERIFICATION
44
45struct key;
46struct pkcs7_message;
47
48extern int verify_pkcs7_signature(const void *data, size_t len,
49				  const void *raw_pkcs7, size_t pkcs7_len,
50				  struct key *trusted_keys,
51				  enum key_being_used_for usage,
52				  int (*view_content)(void *ctx,
53						      const void *data, size_t len,
54						      size_t asn1hdrlen),
55				  void *ctx);
56extern int verify_pkcs7_message_sig(const void *data, size_t len,
57				    struct pkcs7_message *pkcs7,
58				    struct key *trusted_keys,
59				    enum key_being_used_for usage,
60				    int (*view_content)(void *ctx,
61							const void *data,
62							size_t len,
63							size_t asn1hdrlen),
64				    void *ctx);
65
66#ifdef CONFIG_SIGNED_PE_FILE_VERIFICATION
67extern int verify_pefile_signature(const void *pebuf, unsigned pelen,
68				   struct key *trusted_keys,
69				   enum key_being_used_for usage);
70#endif
71
72#endif /* CONFIG_SYSTEM_DATA_VERIFICATION */
73#endif /* _LINUX_VERIFY_PEFILE_H */
74