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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"
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 a hash.
*/
static __init void uefi_blacklist_hash(const char *source, const void *data,
size_t len, const char *type,
size_t type_len)
{
char *hash, *p;
hash = kmalloc(type_len + len * 2 + 1, GFP_KERNEL);
if (!hash)
return;
p = memcpy(hash, type, type_len);
p += type_len;
bin2hex(p, data, len);
p += len * 2;
*p = 0;
mark_hash_blacklisted(hash);
kfree(hash);
}
/*
* Blacklist an X509 TBS hash.
*/
static __init void uefi_blacklist_x509_tbs(const char *source,
const void *data, size_t len)
{
uefi_blacklist_hash(source, data, len, "tbs:", 4);
}
/*
* Blacklist the hash of an executable.
*/
static __init void uefi_blacklist_binary(const char *source,
const void *data, size_t len)
{
uefi_blacklist_hash(source, data, len, "bin:", 4);
}
/*
* Return the appropriate handler for particular signature list types found in
* the UEFI db and MokListRT 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 0;
}
/*
* 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;
return 0;
}
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