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efi_loader: variable: add VendorKeys variable

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The following variable is exported as UEFI specification defines:
VendorKeys: whether the system is configured to use only vendor-provided
	    keys or not
The value will have to be modified if a platform has its own way of
initializing signature database, in particular, PK.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
This commit is contained in:
AKASHI Takahiro 2020-04-14 11:51:43 +09:00 committed by Heinrich Schuchardt
parent 434ffb6422
commit 8353516f4a
1 changed files with 63 additions and 6 deletions
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69
lib/efi_loader/efi_variable.c
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@ -26,6 +26,7 @@ enum efi_secure_mode {
const efi_guid_t efi_guid_cert_type_pkcs7 = EFI_CERT_TYPE_PKCS7_GUID;
static bool efi_secure_boot;
static int efi_secure_mode;
static u8 efi_vendor_keys;
#define READ_ONLY BIT(31)
@ -344,6 +345,8 @@ static efi_status_t efi_transfer_secure_state(enum efi_secure_mode mode)
return EFI_INVALID_PARAMETER;
}
efi_secure_mode = mode;
return EFI_SUCCESS;
err:
@ -359,16 +362,46 @@ err:
*/
static efi_status_t efi_init_secure_state(void)
{
efi_uintn_t size = 0;
enum efi_secure_mode mode;
efi_uintn_t size;
efi_status_t ret;
/*
* TODO:
* Since there is currently no "platform-specific" installation
* method of Platform Key, we can't say if VendorKeys is 0 or 1
* precisely.
*/
size = 0;
ret = EFI_CALL(efi_get_variable(L"PK", &efi_global_variable_guid,
NULL, &size, NULL));
if (ret == EFI_BUFFER_TOO_SMALL && IS_ENABLED(CONFIG_EFI_SECURE_BOOT))
ret = efi_transfer_secure_state(EFI_MODE_USER);
else
ret = efi_transfer_secure_state(EFI_MODE_SETUP);
if (ret == EFI_BUFFER_TOO_SMALL) {
if (IS_ENABLED(CONFIG_EFI_SECURE_BOOT))
mode = EFI_MODE_USER;
else
mode = EFI_MODE_SETUP;
efi_vendor_keys = 0;
} else if (ret == EFI_NOT_FOUND) {
mode = EFI_MODE_SETUP;
efi_vendor_keys = 1;
} else {
goto err;
}
ret = efi_transfer_secure_state(mode);
if (ret == EFI_SUCCESS)
ret = efi_set_variable_internal(L"VendorKeys",
&efi_global_variable_guid,
EFI_VARIABLE_BOOTSERVICE_ACCESS
| EFI_VARIABLE_RUNTIME_ACCESS
| READ_ONLY,
sizeof(efi_vendor_keys),
&efi_vendor_keys,
false);
err:
return ret;
}
@ -1125,6 +1158,8 @@ out:
if (env_set(native_name, val)) {
ret = EFI_DEVICE_ERROR;
} else {
bool vendor_keys_modified = false;
if ((u16_strcmp(variable_name, L"PK") == 0 &&
guidcmp(vendor, &efi_global_variable_guid) == 0)) {
ret = efi_transfer_secure_state(
@ -1132,8 +1167,30 @@ out:
EFI_MODE_USER));
if (ret != EFI_SUCCESS)
goto err;
if (efi_secure_mode != EFI_MODE_SETUP)
vendor_keys_modified = true;
} else if ((u16_strcmp(variable_name, L"KEK") == 0 &&
guidcmp(vendor, &efi_global_variable_guid) == 0)) {
if (efi_secure_mode != EFI_MODE_SETUP)
vendor_keys_modified = true;
}
/* update VendorKeys */
if (vendor_keys_modified & efi_vendor_keys) {
efi_vendor_keys = 0;
ret = efi_set_variable_internal(
L"VendorKeys",
&efi_global_variable_guid,
EFI_VARIABLE_BOOTSERVICE_ACCESS
| EFI_VARIABLE_RUNTIME_ACCESS
| READ_ONLY,
sizeof(efi_vendor_keys),
&efi_vendor_keys,
false);
} else {
ret = EFI_SUCCESS;
}
ret = EFI_SUCCESS;
}
err: