1// SPDX-License-Identifier: GPL-2.0
2
3#include <linux/kernel.h>
4#include <linux/sched.h>
5#include <linux/cred.h>
6#include <linux/err.h>
7#include <linux/efi.h>
8#include <linux/slab.h>
9#include <keys/asymmetric-type.h>
10#include <keys/system_keyring.h>
11#include "../integrity.h"
12#include "keyring_handler.h"
13
14static efi_guid_t efi_cert_x509_guid __initdata = EFI_CERT_X509_GUID;
15static efi_guid_t efi_cert_x509_sha256_guid __initdata =
16 EFI_CERT_X509_SHA256_GUID;
17static efi_guid_t efi_cert_sha256_guid __initdata = EFI_CERT_SHA256_GUID;
18
19/*
20 * Blacklist an X509 TBS hash.
21 */
22static __init void uefi_blacklist_x509_tbs(const char *source,
23 const void *data, size_t len)
24{
25 mark_hash_blacklisted(hash: data, hash_len: len, hash_type: BLACKLIST_HASH_X509_TBS);
26}
27
28/*
29 * Blacklist the hash of an executable.
30 */
31static __init void uefi_blacklist_binary(const char *source,
32 const void *data, size_t len)
33{
34 mark_hash_blacklisted(hash: data, hash_len: len, hash_type: BLACKLIST_HASH_BINARY);
35}
36
37/*
38 * Add an X509 cert to the revocation list.
39 */
40static __init void uefi_revocation_list_x509(const char *source,
41 const void *data, size_t len)
42{
43 add_key_to_revocation_list(data, size: len);
44}
45
46/*
47 * Return the appropriate handler for particular signature list types found in
48 * the UEFI db tables.
49 */
50__init efi_element_handler_t get_handler_for_db(const efi_guid_t *sig_type)
51{
52 if (efi_guidcmp(left: *sig_type, right: efi_cert_x509_guid) == 0)
53 return add_to_platform_keyring;
54 return NULL;
55}
56
57/*
58 * Return the appropriate handler for particular signature list types found in
59 * the MokListRT tables.
60 */
61__init efi_element_handler_t get_handler_for_mok(const efi_guid_t *sig_type)
62{
63 if (efi_guidcmp(left: *sig_type, right: efi_cert_x509_guid) == 0) {
64 if (IS_ENABLED(CONFIG_INTEGRITY_MACHINE_KEYRING) &&
65 imputed_trust_enabled())
66 return add_to_machine_keyring;
67 else
68 return add_to_platform_keyring;
69 }
70 return NULL;
71}
72
73__init efi_element_handler_t get_handler_for_ca_keys(const efi_guid_t *sig_type)
74{
75 if (efi_guidcmp(left: *sig_type, right: efi_cert_x509_guid) == 0)
76 return add_to_machine_keyring;
77
78 return NULL;
79}
80
81__init efi_element_handler_t get_handler_for_code_signing_keys(const efi_guid_t *sig_type)
82{
83 if (efi_guidcmp(left: *sig_type, right: efi_cert_x509_guid) == 0)
84 return add_to_secondary_keyring;
85
86 return NULL;
87}
88
89/*
90 * Return the appropriate handler for particular signature list types found in
91 * the UEFI dbx and MokListXRT tables.
92 */
93__init efi_element_handler_t get_handler_for_dbx(const efi_guid_t *sig_type)
94{
95 if (efi_guidcmp(left: *sig_type, right: efi_cert_x509_sha256_guid) == 0)
96 return uefi_blacklist_x509_tbs;
97 if (efi_guidcmp(left: *sig_type, right: efi_cert_sha256_guid) == 0)
98 return uefi_blacklist_binary;
99 if (efi_guidcmp(left: *sig_type, right: efi_cert_x509_guid) == 0)
100 return uefi_revocation_list_x509;
101 return NULL;
102}
103

source code of linux/security/integrity/platform_certs/keyring_handler.c