1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/kernel.h>
4 #include <linux/sched.h>
5 #include <linux/cred.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"
14 static efi_guid_t efi_cert_x509_guid __initdata = EFI_CERT_X509_GUID;
15 static efi_guid_t efi_cert_x509_sha256_guid __initdata =
16 EFI_CERT_X509_SHA256_GUID;
17 static efi_guid_t efi_cert_sha256_guid __initdata = EFI_CERT_SHA256_GUID;
22 static __init void uefi_blacklist_hash(const char *source, const void *data,
23 size_t len, const char *type,
28 hash = kmalloc(type_len + len * 2 + 1, GFP_KERNEL);
31 p = memcpy(hash, type, type_len);
33 bin2hex(p, data, len);
37 mark_hash_blacklisted(hash);
42 * Blacklist an X509 TBS hash.
44 static __init void uefi_blacklist_x509_tbs(const char *source,
45 const void *data, size_t len)
47 uefi_blacklist_hash(source, data, len, "tbs:", 4);
51 * Blacklist the hash of an executable.
53 static __init void uefi_blacklist_binary(const char *source,
54 const void *data, size_t len)
56 uefi_blacklist_hash(source, data, len, "bin:", 4);
60 * Add an X509 cert to the revocation list.
62 static __init void uefi_revocation_list_x509(const char *source,
63 const void *data, size_t len)
65 add_key_to_revocation_list(data, len);
69 * Return the appropriate handler for particular signature list types found in
72 __init efi_element_handler_t get_handler_for_db(const efi_guid_t *sig_type)
74 if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0)
75 return add_to_platform_keyring;
80 * Return the appropriate handler for particular signature list types found in
81 * the MokListRT tables.
83 __init efi_element_handler_t get_handler_for_mok(const efi_guid_t *sig_type)
85 if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0) {
86 if (IS_ENABLED(CONFIG_INTEGRITY_MACHINE_KEYRING) && trust_moklist())
87 return add_to_machine_keyring;
89 return add_to_platform_keyring;
95 * Return the appropriate handler for particular signature list types found in
96 * the UEFI dbx and MokListXRT tables.
98 __init efi_element_handler_t get_handler_for_dbx(const efi_guid_t *sig_type)
100 if (efi_guidcmp(*sig_type, efi_cert_x509_sha256_guid) == 0)
101 return uefi_blacklist_x509_tbs;
102 if (efi_guidcmp(*sig_type, efi_cert_sha256_guid) == 0)
103 return uefi_blacklist_binary;
104 if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0)
105 return uefi_revocation_list_x509;