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/** @file
This is DCS boot loader application
Copyright (c) 2016. Disk Cryptography Services for EFI (DCS), Alex Kolotnikov
Copyright (c) 2016. VeraCrypt, Mounir IDRASSI
This program and the accompanying materials
are licensed and made available under the terms and conditions
of the GNU Lesser General Public License, version 3.0 (LGPL-3.0).
The full text of the license may be found at
https://opensource.org/licenses/LGPL-3.0
**/
#include <Uefi.h>
#include <Library/CommonLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/DevicePathLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/PrintLib.h>
#include "DcsConfig.h"
#include <Guid/Gpt.h>
#include <Guid/GlobalVariable.h>
EFI_GUID ImagePartGuid;
EFI_GUID *gEfiExecPartGuid = &ImagePartGuid;
CHAR16 *gEfiExecCmdDefault = L"\\EFI\\Microsoft\\Boot\\Bootmgfw.efi";
CHAR16 *gEfiExecCmd = NULL;
CHAR8 gDoExecCmdMsg[256];
EFI_STATUS
DoExecCmd()
{
EFI_STATUS res;
gDoExecCmdMsg[0] = 0;
res = EfiFindPartByGUID(gEfiExecPartGuid, &gFileRootHandle);
if (!EFI_ERROR(res)) {
res = FileOpenRoot(gFileRootHandle, &gFileRoot);
if (!EFI_ERROR(res)) {
res = EfiExec(NULL, gEfiExecCmd);
AsciiSPrint(gDoExecCmdMsg, sizeof(gDoExecCmdMsg), "\nCan't exec %s start partition %g\n", gEfiExecCmd, gEfiExecPartGuid);
} else {
AsciiSPrint(gDoExecCmdMsg, sizeof(gDoExecCmdMsg), "\nCan't open start partition %g\n", gEfiExecPartGuid);
}
} else {
AsciiSPrint(gDoExecCmdMsg, sizeof(gDoExecCmdMsg), "\nCan't find start partition %g\n", gEfiExecPartGuid);
}
return res;
}
//////////////////////////////////////////////////////////////////////////
// BML
//////////////////////////////////////////////////////////////////////////
CHAR16* sDcsBmlEfi = L"EFI\\VeraCrypt\\DcsBml.dcs";
CHAR16* sDcsBmlEfiDesc = L"VeraCrypt(DcsBml) driver";
CHAR16* sDcsBmlDriverVar = L"DriverDC5B";
UINT16 DcsBmlDriverNum = 0x0DC5B;
VOID
UpdateDriverBmlStart() {
EFI_STATUS res;
UINTN len;
UINT32 attr;
int drvInst;
CHAR16* tmp = NULL;
// Driver load selected?
drvInst = ConfigReadInt("DcsBmlDriver", 1);
if (drvInst) {
res = EfiGetVar(sDcsBmlDriverVar, &gEfiGlobalVariableGuid, &tmp, &len, &attr);
// Driver installed?
if (EFI_ERROR(res)) {
// No -> install
res = BootMenuItemCreate(sDcsBmlDriverVar, sDcsBmlEfiDesc, gFileRootHandle, sDcsBmlEfi, FALSE);
// ERR_PRINT(L"Drv %s %r\n", sDcsBmlDriverVar, res);
if (!EFI_ERROR(res)) {
len = 0;
res = EfiGetVar(L"DriverOrder", &gEfiGlobalVariableGuid, &tmp, &len, &attr);
if (!EFI_ERROR(res)) len = len / 2;
res = BootOrderInsert(L"DriverOrder", len, DcsBmlDriverNum);
}
// ERR_PRINT(L"Drv order %d %r\n", len, res);
}
MEM_FREE(tmp);
}
else {
// uninstall driver
res = EfiGetVar(sDcsBmlDriverVar, &gEfiGlobalVariableGuid, &tmp, &len, &attr);
if (!EFI_ERROR(res)) {
BootMenuItemRemove(sDcsBmlDriverVar);
BootOrderRemove(L"DriverOrder", DcsBmlDriverNum);
}
}
MEM_FREE(tmp);
}
/**
The actual entry point for the application.
@param[in] ImageHandle The firmware allocated handle for the EFI image.
@param[in] SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The entry point executed successfully.
@retval other Some error occur when executing this entry point.
**/
EFI_STATUS
EFIAPI
DcsBootMain(
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS res;
UINTN len;
UINT32 attr;
BOOLEAN searchOnESP = FALSE;
// EFI_INPUT_KEY key;
InitBio();
res = InitFS();
if (EFI_ERROR(res)) {
ERR_PRINT(L"InitFS %r\n", res);
}
// BML installed?
if (EFI_ERROR(InitBml())) {
// if not -> execute
EfiExec(NULL, sDcsBmlEfi);
}
UpdateDriverBmlStart();
// Try platform info
if (EFI_ERROR(FileExist(NULL, L"\\EFI\\VeraCrypt\\PlatformInfo")) &&
!EFI_ERROR(FileExist(NULL, L"\\EFI\\VeraCrypt\\DcsInfo.dcs"))) {
res = EfiExec(NULL, L"\\EFI\\VeraCrypt\\DcsInfo.dcs");
if (!EFI_ERROR(res) &&
!EFI_ERROR(FileExist(NULL, L"\\EFI\\VeraCrypt\\PlatformInfo"))) {
gST->RuntimeServices->ResetSystem(EfiResetCold, EFI_SUCCESS, 0, NULL);
}
}
// Load all drivers
res = EfiExec(NULL, L"\\EFI\\VeraCrypt\\LegacySpeaker.dcs");
res = EfiGetPartGUID(gFileRootHandle, &ImagePartGuid);
if (EFI_ERROR(res)) {
ERR_PRINT(L"\nStart partition %r\n", res);
return res;
}
EfiSetVar(L"DcsExecPartGuid", NULL, &ImagePartGuid, sizeof(EFI_GUID), EFI_VARIABLE_BOOTSERVICE_ACCESS);
EfiSetVar(L"DcsExecCmd", NULL, gEfiExecCmdDefault, (StrLen(gEfiExecCmdDefault) + 1) * 2, EFI_VARIABLE_BOOTSERVICE_ACCESS);
// Authorize
res = EfiExec(NULL, L"\\EFI\\VeraCrypt\\DcsInt.dcs");
if (EFI_ERROR(res)) {
// ERR_PRINT(L"\nDcsInt.efi %r\n",res);
return res;
}
res = EfiGetVar(L"DcsExecPartGuid", NULL, &gEfiExecPartGuid, &len, &attr);
if (EFI_ERROR(res)) {
gEfiExecPartGuid = &ImagePartGuid;
}
res = EfiGetVar(L"DcsExecCmd", NULL, &gEfiExecCmd, &len, &attr);
if (EFI_ERROR(res)) {
gEfiExecCmd = gEfiExecCmdDefault;
}
searchOnESP = CompareGuid(gEfiExecPartGuid, &ImagePartGuid) &&
EFI_ERROR(FileExist(NULL, gEfiExecCmd));
// Clear DcsExecPartGuid before execute OS to avoid problem in VirtualBox with reboot.
EfiSetVar(L"DcsExecPartGuid", NULL, NULL, 0, EFI_VARIABLE_BOOTSERVICE_ACCESS);
EfiSetVar(L"DcsExecCmd", NULL, NULL, 0, EFI_VARIABLE_BOOTSERVICE_ACCESS);
// Find new start partition
ConnectAllEfi();
InitBio();
res = InitFS();
// Default load of bootmgfw?
if (searchOnESP) {
// gEfiExecCmd is not found on start partition. Try from ESP
EFI_BLOCK_IO_PROTOCOL *bio = NULL;
EFI_PARTITION_TABLE_HEADER *gptHdr = NULL;
EFI_PARTITION_ENTRY *gptEntry = NULL;
HARDDRIVE_DEVICE_PATH hdp;
EFI_HANDLE disk;
if (!EFI_ERROR(res = EfiGetPartDetails(gFileRootHandle, &hdp, &disk))) {
if ((bio = EfiGetBlockIO(disk)) != NULL) {
if (!EFI_ERROR(res = GptReadHeader(bio, 1, &gptHdr)) &&
!EFI_ERROR(res = GptReadEntryArray(bio, gptHdr, &gptEntry))) {
UINT32 i;
for (i = 0; i < gptHdr->NumberOfPartitionEntries; ++i) {
if (CompareGuid(&gptEntry[i].PartitionTypeGUID, &gEfiPartTypeSystemPartGuid)) {
// select ESP GUID
CopyGuid(gEfiExecPartGuid, &gptEntry[i].UniquePartitionGUID);
res = DoExecCmd();
if(EFI_ERROR(res)) continue;
}
}
}
}
}
} else {
res = DoExecCmd();
}
ERR_PRINT(L"%a\nStatus - %r", gDoExecCmdMsg, res);
EfiCpuHalt();
return EFI_INVALID_PARAMETER;
}
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