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// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/cred.h>
#include <linux/err.h>
#include <linux/efi.h>
#include <linux/slab.h>
#include <keys/asymmetric-type.h>
#include <keys/system_keyring.h>
#include "../integrity.h"
#include "keyring_handler.h"
static efi_guid_t efi_cert_x509_guid __initdata = EFI_CERT_X509_GUID;
static efi_guid_t efi_cert_x509_sha256_guid __initdata =
EFI_CERT_X509_SHA256_GUID;
static efi_guid_t efi_cert_sha256_guid __initdata = EFI_CERT_SHA256_GUID;
/*
* Blacklist an X509 TBS hash.
*/
static __init void uefi_blacklist_x509_tbs(const char *source,
const void *data, size_t len)
{
mark_hash_blacklisted(data, len, BLACKLIST_HASH_X509_TBS);
}
/*
* Blacklist the hash of an executable.
*/
static __init void uefi_blacklist_binary(const char *source,
const void *data, size_t len)
{
mark_hash_blacklisted(data, len, BLACKLIST_HASH_BINARY);
}
/*
* Add an X509 cert to the revocation list.
*/
static __init void uefi_revocation_list_x509(const char *source,
const void *data, size_t len)
{
add_key_to_revocation_list(data, len);
}
/*
* Return the appropriate handler for particular signature list types found in
* the UEFI db tables.
*/
__init efi_element_handler_t get_handler_for_db(const efi_guid_t *sig_type)
{
if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0)
return add_to_platform_keyring;
return NULL;
}
/*
* Return the appropriate handler for particular signature list types found in
* the MokListRT tables.
*/
__init efi_element_handler_t get_handler_for_mok(const efi_guid_t *sig_type)
{
if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0) {
if (IS_ENABLED(CONFIG_INTEGRITY_MACHINE_KEYRING) &&
imputed_trust_enabled())
return add_to_machine_keyring;
else
return add_to_platform_keyring;
}
return NULL;
}
__init efi_element_handler_t get_handler_for_ca_keys(const efi_guid_t *sig_type)
{
if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0)
return add_to_machine_keyring;
return NULL;
}
__init efi_element_handler_t get_handler_for_code_signing_keys(const efi_guid_t *sig_type)
{
if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0)
return add_to_secondary_keyring;
return NULL;
}
/*
* Return the appropriate handler for particular signature list types found in
* the UEFI dbx and MokListXRT tables.
*/
__init efi_element_handler_t get_handler_for_dbx(const efi_guid_t *sig_type)
{
if (efi_guidcmp(*sig_type, efi_cert_x509_sha256_guid) == 0)
return uefi_blacklist_x509_tbs;
if (efi_guidcmp(*sig_type, efi_cert_sha256_guid) == 0)
return uefi_blacklist_binary;
if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0)
return uefi_revocation_list_x509;
return NULL;
}
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