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kf4aic.c
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kf4aic.c
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/*
* Copyright (c) 2019, Intel Corporation
* All rights reserved.
*
* Author: Zhou, Jianfeng <jianfeng.zhou@intel.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <efi.h>
#include <efiapi.h>
#include <efilib.h>
#include "log.h"
#include "protocol.h"
#include "uefi_utils.h"
#include "vbmeta_ias.h"
#include "lib.h"
#include "ux.h"
#ifdef RPMB_STORAGE
#include "rpmb.h"
#include "rpmb_storage.h"
#endif
#ifdef USE_TRUSTY
#include "security.h"
#include "trusty_interface.h"
#include "security_interface.h"
#endif
#define SYSTEMD_BOOT_FILE L"loaderx64.efi"
#define TOS_IMAGE_FILE L"tos.img"
#define VBMETA_IAS_FILE L"vbmeta.ias"
#define ESP_PARTITION L"EFI"
EFI_STATUS load_and_start_efi(EFI_HANDLE image_handle, CHAR16 *efi_file)
{
EFI_GUID gEfiLoadedImageProtocolGuid = LOADED_IMAGE_PROTOCOL;
EFI_STATUS Status = EFI_SUCCESS;
EFI_HANDLE efi_handle = NULL;
EFI_DEVICE_PATH *device_path;
EFI_LOADED_IMAGE *image_info;
EFI_LOADED_IMAGE *g_loaded_image = NULL;
UINTN exit_data_size = 0;
uefi_call_wrapper(BS->HandleProtocol, 3, image_handle, &LoadedImageProtocol, (void **)&g_loaded_image);
device_path = FileDevicePath(g_loaded_image->DeviceHandle, efi_file);
Status = BS->LoadImage(
FALSE,
image_handle,
device_path,
(VOID *) NULL,
0,
&efi_handle);
if (Status != EFI_SUCCESS && Status != EFI_SECURITY_VIOLATION) {
error(L"Could not load the image '%s'", efi_file);
return Status;
}
debug(L"Load '%s' success", efi_file);
Status = BS->OpenProtocol(
efi_handle,
&gEfiLoadedImageProtocolGuid,
(VOID **) &image_info,
image_handle,
(VOID *) NULL,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (!EFI_ERROR(Status))
debug(L"ImageSize = %d", image_info->ImageSize);
Status = BS->StartImage(efi_handle, &exit_data_size, (CHAR16 **) NULL);
if (Status != EFI_SUCCESS) {
error(L"Could not start image");
error(L"Exit data size: %d", exit_data_size);
}
return Status;
}
CHAR16 *get_base_path(EFI_HANDLE image_handle)
{
EFI_STATUS ret;
EFI_LOADED_IMAGE *g_loaded_image = NULL;
CHAR16 *self_path = NULL;
ret = uefi_call_wrapper(BS->HandleProtocol, 3, image_handle, &LoadedImageProtocol, (void **)&g_loaded_image);
if (EFI_ERROR(ret)) {
error(L"OpenProtocol LoadedImageProtocol failed");
return NULL;
}
self_path = ((FILEPATH_DEVICE_PATH *)(g_loaded_image->FilePath))->PathName;
return self_path;
}
CHAR16 *absolute_path(EFI_HANDLE image_handle, CHAR16 *file)
{
CHAR16 *base_path = NULL;
CHAR16 *abs_path = NULL;
UINTN len;
if (file[0] == L'\\')
return StrDuplicate(file);
base_path = get_base_path(image_handle);
if (base_path == NULL)
return NULL;
len = StrLen(base_path);
if (len > 4) {
if (StriCmp(base_path + len - 4, L".EFI") == 0) {
UINTN i = len - 4;
while (i > 0 && base_path[i] != L'\\')
i--;
base_path[i] = 0;
}
}
len = StrLen(base_path);
if (len == 0)
return StrDuplicate(file);
len = StrLen(base_path) + StrLen(file) + 2;
abs_path = (CHAR16 *)AllocatePool(len * sizeof(CHAR16));
if (abs_path == NULL)
return NULL;
StrCpy(abs_path, base_path);
StrCat(abs_path, L"\\");
StrCat(abs_path, file);
return abs_path;
}
static VOID show_disable_secure_boot_warnning()
{
enum boot_target bt = NORMAL_BOOT;
#ifdef USE_UI
bt = ux_prompt_user(SECURE_BOOT_CODE, FALSE, BOOT_STATE_YELLOW, NULL, 0);
#else
debug(L"Secure boot is disabled");
#endif
if (bt != NORMAL_BOOT)
halt_system();
}
EFI_STATUS start_systemd_boot(EFI_HANDLE image_handle)
{
EFI_STATUS ret;
CHAR16 *boot_path = NULL;
boot_path = absolute_path(image_handle, SYSTEMD_BOOT_FILE);
if (boot_path == NULL)
return EFI_NOT_STARTED;
debug(L"load and start '%s'...", boot_path);
ret = load_and_start_efi(image_handle, boot_path);
FreePool(boot_path);
return ret;
}
#ifdef USE_TRUSTY
struct rot_data_t g_rot_data = {0};
EFI_STATUS load_file(EFI_HANDLE image_handle, CHAR16 *file, OUT VOID **image)
{
EFI_STATUS ret;
UINTN size = 0;
EFI_FILE_IO_INTERFACE *io;
EFI_LOADED_IMAGE *g_loaded_image = NULL;
CHAR16 *abs_path;
uefi_call_wrapper(BS->HandleProtocol, 3, image_handle, &LoadedImageProtocol, (void **)&g_loaded_image);
ret = handle_protocol(g_loaded_image->DeviceHandle, &FileSystemProtocol, (void **)&io);
if (EFI_ERROR(ret))
return ret;
abs_path = absolute_path(image_handle, file);
if (abs_path == NULL)
return EFI_NOT_FOUND;
ret = uefi_read_file(io, abs_path, image, &size);
FreePool(abs_path);
if (EFI_ERROR(ret)) {
error(L"read file failed: %s", file);
return ret;
}
debug(L"file size of '%s' = %d\n", file, size);
return ret;
}
EFI_STATUS load_and_start_tos(EFI_HANDLE image)
{
EFI_STATUS ret;
VOID *tosimage = NULL;
ret = load_file(image, TOS_IMAGE_FILE, &tosimage);
if (EFI_ERROR(ret))
return ret;
ret = start_trusty(tosimage);
debug(L"start_trusty return: %r(%x)\n", ret, ret);
return ret;
}
#endif
EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *_table)
{
EFI_STATUS ret;
BOOLEAN verify_pass = FALSE;
CHAR16 *vbmeta_path = NULL;
#ifdef RPMB_STORAGE
UINT32 boot_state;
#endif
InitializeLib(image, _table);
vbmeta_path = absolute_path(image, VBMETA_IAS_FILE);
// if secureboot is disabled, return always successful and verify_pass always true
ret = verify_vbmeta_ias(ESP_PARTITION, vbmeta_path, &verify_pass);
if (vbmeta_path != NULL)
FreePool(vbmeta_path);
if (EFI_ERROR(ret) || !verify_pass)
return ret;
#ifdef RPMB_STORAGE
ret = set_device_security_info(NULL);
if (EFI_ERROR(ret))
error(L"Failed to init security info");
if (is_platform_secure_boot_enabled())
boot_state = BOOT_STATE_GREEN;
else {
boot_state = BOOT_STATE_YELLOW;
show_disable_secure_boot_warnning();
}
init_rot_data(boot_state, &g_rot_data);
debug(L"teedata region init...\n");
ret = rpmb_storage_init();
if (EFI_ERROR(ret))
error(L"Failed to init teedata region");
debug(L"teedata region init ret = %X\n", ret);
ret = rpmb_key_init();
if (EFI_ERROR(ret))
error(L"teedata region init failure for osloader.\n");
#endif
#ifdef USE_TRUSTY
debug(L"TRUSTY enabled...\n");
ret = load_and_start_tos(image);
if (EFI_ERROR(ret))
return ret;
#endif
ret = start_systemd_boot(image);
return ret;
}