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(data, len, 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(data, len, 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, 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(*sig_type, 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(*sig_type, 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(*sig_type, 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(*sig_type, 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(*sig_type, efi_cert_x509_sha256_guid) == 0)
 96		return uefi_blacklist_x509_tbs;
 97	if (efi_guidcmp(*sig_type, efi_cert_sha256_guid) == 0)
 98		return uefi_blacklist_binary;
 99	if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0)
100		return uefi_revocation_list_x509;
101	return NULL;
102}