86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
// 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) && trust_moklist())
|
|
return add_to_machine_keyring;
|
|
else
|
|
return add_to_platform_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;
|
|
}
|