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efi_loader: identify PK, KEK, db, dbx correctly

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To determine if a varible is on the of the authentication variables
PK, KEK, db, dbx we have to check both the name and the GUID.

Provide a function converting the variable-name/guid pair to an enum and
use it consistently.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt
2020-07-15 12:40:35 +02:00
parent be66b89da3
commit 99bfab8b58
3 changed files with 60 additions and 13 deletions
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27
lib/efi_loader/efi_var_common.c
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@@ -16,6 +16,23 @@ enum efi_secure_mode {
EFI_MODE_DEPLOYED,
};
struct efi_auth_var_name_type {
const u16 *name;
const efi_guid_t *guid;
const enum efi_auth_var_type type;
};
static const struct efi_auth_var_name_type name_type[] = {
{u"PK", &efi_global_variable_guid, EFI_AUTH_VAR_PK},
{u"KEK", &efi_global_variable_guid, EFI_AUTH_VAR_KEK},
{u"db", &efi_guid_image_security_database, EFI_AUTH_VAR_DB},
{u"dbx", &efi_guid_image_security_database, EFI_AUTH_VAR_DBX},
/* not used yet
{u"dbt", &efi_guid_image_security_database, EFI_AUTH_VAR_DBT},
{u"dbr", &efi_guid_image_security_database, EFI_AUTH_VAR_DBR},
*/
};
static bool efi_secure_boot;
static enum efi_secure_mode efi_secure_mode;
@@ -293,3 +310,13 @@ bool efi_secure_boot_enabled(void)
{
return efi_secure_boot;
}
enum efi_auth_var_type efi_auth_var_get_type(u16 *name, const efi_guid_t *guid)
{
for (size_t i = 0; i < ARRAY_SIZE(name_type); ++i) {
if (!u16_strcmp(name, name_type[i].name) &&
!guidcmp(guid, name_type[i].guid))
return name_type[i].type;
}
return EFI_AUTH_VAR_NONE;
}