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BootMain.cpp
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/*
Copyright (c) 2008-2011 TrueCrypt Developers Association. All rights reserved.
Governed by the TrueCrypt License 3.0 the full text of which is contained in
the file License.txt included in TrueCrypt binary and source code distribution
packages.
*/
#include "Crc.h"
#include "Crypto.h"
#include "Password.h"
#include "Volumes.h"
#include "Platform.h"
#include "Bios.h"
#include "BootConfig.h"
#include "BootMain.h"
#include "BootDefs.h"
#include "BootCommon.h"
#include "BootConsoleIo.h"
#include "BootDebug.h"
#include "BootDiskIo.h"
#include "BootEncryptedIo.h"
#include "BootMemory.h"
#include "BootStrings.h"
#include "IntFilter.h"
static void InitScreen ()
{
ClearScreen();
const char *title =
#ifndef TC_WINDOWS_BOOT_RESCUE_DISK_MODE
" TrueCrypt Boot Loader "
#else
" TrueCrypt Rescue Disk "
#endif
VERSION_STRING "\r\n";
Print (title);
PrintRepeatedChar ('\xDC', TC_BIOS_MAX_CHARS_PER_LINE);
#ifndef TC_WINDOWS_BOOT_RESCUE_DISK_MODE
if (CustomUserMessage[0])
{
PrintEndl();
Print (CustomUserMessage);
}
#endif
PrintEndl (2);
}
static void PrintMainMenu ()
{
if (PreventBootMenu)
return;
Print (" Keyboard Controls:\r\n");
Print (" [Esc] ");
#ifndef TC_WINDOWS_BOOT_RESCUE_DISK_MODE
Print ((BootSectorFlags & TC_BOOT_CFG_MASK_HIDDEN_OS_CREATION_PHASE) != TC_HIDDEN_OS_CREATION_PHASE_NONE
? "Boot Non-Hidden System (Boot Manager)"
: "Skip Authentication (Boot Manager)");
#else // TC_WINDOWS_BOOT_RESCUE_DISK_MODE
Print ("Skip Authentication (Boot Manager)");
Print ("\r\n [F8] "); Print ("Repair Options");
#endif // TC_WINDOWS_BOOT_RESCUE_DISK_MODE
PrintEndl (3);
}
static bool IsMenuKey (byte scanCode)
{
#ifdef TC_WINDOWS_BOOT_RESCUE_DISK_MODE
return scanCode == TC_MENU_KEY_REPAIR;
#else
return false;
#endif
}
static bool AskYesNo (const char *message)
{
Print (message);
Print ("? (y/n): ");
while (true)
{
switch (GetKeyboardChar())
{
case 'y':
case 'Y':
case 'z':
case 'Z':
Print ("y\r\n");
return true;
case 'n':
case 'N':
Print ("n\r\n");
return false;
default:
Beep();
}
}
}
static int AskSelection (const char *options[], size_t optionCount)
{
for (int i = 0; i < optionCount; ++i)
{
Print ("["); Print (i + 1); Print ("] ");
Print (options[i]);
PrintEndl();
}
Print ("[Esc] Cancel\r\n\r\n");
Print ("To select, press 1-9: ");
char str;
while (true)
{
if (GetString (&str, 1) == 0)
return 0;
if (str >= '1' && str <= optionCount + '0')
return str - '0';
Beep();
PrintBackspace();
}
}
static byte AskPassword (Password &password)
{
size_t pos = 0;
byte scanCode;
byte asciiCode;
Print ("Enter password");
Print (PreventNormalSystemBoot ? " for hidden system:\r\n" : ": ");
while (true)
{
asciiCode = GetKeyboardChar (&scanCode);
switch (scanCode)
{
case TC_BIOS_KEY_ENTER:
ClearBiosKeystrokeBuffer();
PrintEndl();
password.Length = pos;
return scanCode;
case TC_BIOS_KEY_BACKSPACE:
if (pos > 0)
{
if (pos < MAX_PASSWORD)
PrintBackspace();
else
PrintCharAtCursor (' ');
--pos;
}
continue;
default:
if (scanCode == TC_BIOS_KEY_ESC || IsMenuKey (scanCode))
{
burn (password.Text, sizeof (password.Text));
ClearBiosKeystrokeBuffer();
PrintEndl();
return scanCode;
}
}
if (!IsPrintable (asciiCode) || pos == MAX_PASSWORD)
{
Beep();
continue;
}
password.Text[pos++] = asciiCode;
if (pos < MAX_PASSWORD)
PrintChar ('*');
else
PrintCharAtCursor ('*');
}
}
static void ExecuteBootSector (byte drive, byte *sectorBuffer)
{
Print ("Booting...\r\n");
CopyMemory (sectorBuffer, 0x0000, 0x7c00, TC_LB_SIZE);
BootStarted = true;
uint32 addr = 0x7c00;
__asm
{
cli
mov dl, drive // Boot drive
mov dh, 0
xor ax, ax
mov si, ax
mov ds, ax
mov es, ax
mov ss, ax
mov sp, 0x7c00
sti
jmp cs:addr
}
}
static bool OpenVolume (byte drive, Password &password, CRYPTO_INFO **cryptoInfo, uint32 *headerSaltCrc32, bool skipNormal, bool skipHidden)
{
int volumeType;
bool hiddenVolume;
uint64 headerSec;
AcquireSectorBuffer();
for (volumeType = 1; volumeType <= 2; ++volumeType)
{
hiddenVolume = (volumeType == 2);
if (hiddenVolume)
{
if (skipHidden || PartitionFollowingActive.Drive != drive || PartitionFollowingActive.SectorCount <= ActivePartition.SectorCount)
continue;
headerSec = PartitionFollowingActive.StartSector + TC_HIDDEN_VOLUME_HEADER_OFFSET / TC_LB_SIZE;
}
else
{
if (skipNormal)
continue;
headerSec.HighPart = 0;
headerSec.LowPart = TC_BOOT_VOLUME_HEADER_SECTOR;
}
if (ReadSectors (SectorBuffer, drive, headerSec, 1) != BiosResultSuccess)
continue;
if (ReadVolumeHeader (!hiddenVolume, (char *) SectorBuffer, &password, cryptoInfo, nullptr) == ERR_SUCCESS)
{
// Prevent opening a non-system hidden volume
if (hiddenVolume && !((*cryptoInfo)->HeaderFlags & TC_HEADER_FLAG_ENCRYPTED_SYSTEM))
{
crypto_close (*cryptoInfo);
continue;
}
if (headerSaltCrc32)
*headerSaltCrc32 = GetCrc32 (SectorBuffer, PKCS5_SALT_SIZE);
break;
}
}
ReleaseSectorBuffer();
return volumeType != 3;
}
static bool CheckMemoryRequirements ()
{
uint16 codeSeg;
__asm mov codeSeg, cs
if (codeSeg == TC_BOOT_LOADER_LOWMEM_SEGMENT)
{
PrintErrorNoEndl ("BIOS reserved too much memory: ");
uint16 memFree;
__asm
{
push es
xor ax, ax
mov es, ax
mov ax, es:[0x413]
mov memFree, ax
pop es
}
Print (memFree);
PrintEndl();
Print (TC_BOOT_STR_UPGRADE_BIOS);
return false;
}
return true;
}
static bool MountVolume (byte drive, byte &exitKey, bool skipNormal, bool skipHidden)
{
BootArguments *bootArguments = (BootArguments *) TC_BOOT_LOADER_ARGS_OFFSET;
int incorrectPasswordCount = 0;
EraseMemory (bootArguments, sizeof (*bootArguments));
// Open volume header
while (true)
{
exitKey = AskPassword (bootArguments->BootPassword);
if (exitKey != TC_BIOS_KEY_ENTER)
return false;
if (OpenVolume (BootDrive, bootArguments->BootPassword, &BootCryptoInfo, &bootArguments->HeaderSaltCrc32, skipNormal, skipHidden))
break;
if (GetShiftFlags() & TC_BIOS_SHIFTMASK_CAPSLOCK)
Print ("Warning: Caps Lock is on.\r\n");
Print ("Incorrect password.\r\n\r\n");
if (++incorrectPasswordCount == 4)
{
#ifdef TC_WINDOWS_BOOT_RESCUE_DISK_MODE
Print ("If you are sure the password is correct, the key data may be damaged.\r\n"
"If so, use 'Repair Options' > 'Restore key data'.\r\n\r\n");
#else
Print ("If you are sure the password is correct, the key data may be damaged. Boot your\r\n"
"TrueCrypt Rescue Disk and select 'Repair Options' > 'Restore key data'.\r\n\r\n");
#endif
}
}
// Setup boot arguments
bootArguments->BootLoaderVersion = VERSION_NUM;
bootArguments->CryptoInfoOffset = (uint16) BootCryptoInfo;
bootArguments->CryptoInfoLength = sizeof (*BootCryptoInfo);
if (BootCryptoInfo->hiddenVolume)
bootArguments->HiddenSystemPartitionStart = PartitionFollowingActive.StartSector << TC_LB_SIZE_BIT_SHIFT_DIVISOR;
if (ExtraBootPartitionPresent)
bootArguments->Flags |= TC_BOOT_ARGS_FLAG_EXTRA_BOOT_PARTITION;
TC_SET_BOOT_ARGUMENTS_SIGNATURE (bootArguments->Signature);
// Setup virtual encrypted partition
if (BootCryptoInfo->EncryptedAreaLength.HighPart != 0 || BootCryptoInfo->EncryptedAreaLength.LowPart != 0)
{
EncryptedVirtualPartition.Drive = BootDrive;
EncryptedVirtualPartition.StartSector = BootCryptoInfo->EncryptedAreaStart >> TC_LB_SIZE_BIT_SHIFT_DIVISOR;
HiddenVolumeStartUnitNo = EncryptedVirtualPartition.StartSector;
HiddenVolumeStartSector = PartitionFollowingActive.StartSector;
HiddenVolumeStartSector += EncryptedVirtualPartition.StartSector;
EncryptedVirtualPartition.SectorCount = BootCryptoInfo->EncryptedAreaLength >> TC_LB_SIZE_BIT_SHIFT_DIVISOR;
EncryptedVirtualPartition.EndSector = EncryptedVirtualPartition.SectorCount - 1;
EncryptedVirtualPartition.EndSector += EncryptedVirtualPartition.StartSector;
}
else
{
// Drive not encrypted
EncryptedVirtualPartition.Drive = TC_INVALID_BIOS_DRIVE;
}
return true;
}
static bool GetSystemPartitions (byte drive)
{
size_t partCount;
if (!GetActivePartition (drive))
return false;
// Find partition following the active one
GetDrivePartitions (drive, &PartitionFollowingActive, 1, partCount, false, &ActivePartition);
// If there is an extra boot partition, use the partitions following it.
// The real boot partition is determined in BootEncryptedDrive().
if (ActivePartition.SectorCount.HighPart == 0 && ActivePartition.SectorCount.LowPart <= TC_MAX_EXTRA_BOOT_PARTITION_SIZE / TC_LB_SIZE
&& PartitionFollowingActive.Drive != TC_INVALID_BIOS_DRIVE)
{
ExtraBootPartitionPresent = true;
ActivePartition = PartitionFollowingActive;
GetDrivePartitions (drive, &PartitionFollowingActive, 1, partCount, false, &ActivePartition);
}
return true;
}
static byte BootEncryptedDrive ()
{
BootArguments *bootArguments = (BootArguments *) TC_BOOT_LOADER_ARGS_OFFSET;
byte exitKey;
BootCryptoInfo = NULL;
if (!GetSystemPartitions (BootDrive))
goto err;
if (!MountVolume (BootDrive, exitKey, PreventNormalSystemBoot, false))
return exitKey;
if (!CheckMemoryRequirements ())
goto err;
if (BootCryptoInfo->hiddenVolume)
{
EncryptedVirtualPartition = ActivePartition;
bootArguments->DecoySystemPartitionStart = ActivePartition.StartSector << TC_LB_SIZE_BIT_SHIFT_DIVISOR;
}
if (ExtraBootPartitionPresent && !GetActivePartition (BootDrive))
goto err;
if (ReadWriteMBR (false, ActivePartition.Drive) != BiosResultSuccess)
goto err;
bootArguments->BootDriveSignature = *(uint32 *) (SectorBuffer + 0x1b8);
if (!InstallInterruptFilters())
goto err;
bootArguments->BootArgumentsCrc32 = GetCrc32 ((byte *) bootArguments, (byte *) &bootArguments->BootArgumentsCrc32 - (byte *) bootArguments);
while (true)
{
// Execute boot sector of the active partition
if (ReadSectors (SectorBuffer, ActivePartition.Drive, ActivePartition.StartSector, 1) == BiosResultSuccess)
{
if (*(uint16 *) (SectorBuffer + 510) != 0xaa55)
{
PrintError (TC_BOOT_STR_NO_BOOT_PARTITION);
GetKeyboardChar();
}
ExecuteBootSector (ActivePartition.Drive, SectorBuffer);
}
GetKeyboardChar();
}
err:
if (BootCryptoInfo)
{
crypto_close (BootCryptoInfo);
BootCryptoInfo = NULL;
}
EncryptedVirtualPartition.Drive = TC_INVALID_BIOS_DRIVE;
EraseMemory ((void *) TC_BOOT_LOADER_ARGS_OFFSET, sizeof (BootArguments));
byte scanCode;
GetKeyboardChar (&scanCode);
return scanCode;
}
static void BootMenu ()
{
BiosResult result;
Partition partitions[16];
Partition bootablePartitions[9];
size_t partitionCount;
size_t bootablePartitionCount = 0;
for (byte drive = TC_FIRST_BIOS_DRIVE; drive <= TC_LAST_BIOS_DRIVE; ++drive)
{
if (GetDrivePartitions (drive, partitions, array_capacity (partitions), partitionCount, false, nullptr, true) == BiosResultSuccess)
{
for (size_t i = 0; i < partitionCount; ++i)
{
const Partition &partition = partitions[i];
result = ReadSectors (SectorBuffer, drive, partition.StartSector, 1);
if (result == BiosResultSuccess && *(uint16 *) (SectorBuffer + TC_LB_SIZE - 2) == 0xaa55)
{
// Windows writes boot loader on all NTFS/FAT filesytems it creates and, therefore,
// NTFS/FAT partitions must have the boot indicator set to be considered bootable.
if (!partition.Active
&& (*(uint32 *) (SectorBuffer + 3) == 0x5346544e // 'NTFS'
|| *(uint32 *) (SectorBuffer + 3) == 0x41465845 && SectorBuffer[7] == 'T' // 'exFAT'
|| *(uint16 *) (SectorBuffer + 54) == 0x4146 && SectorBuffer[56] == 'T' // 'FAT'
|| *(uint16 *) (SectorBuffer + 82) == 0x4146 && SectorBuffer[84] == 'T'))
{
continue;
}
// Bootable sector found
if (bootablePartitionCount < array_capacity (bootablePartitions))
bootablePartitions[bootablePartitionCount++] = partition;
}
}
}
}
if (bootablePartitionCount < 1)
{
PrintError (TC_BOOT_STR_NO_BOOT_PARTITION);
GetKeyboardChar();
return;
}
char partChar;
while (true)
{
InitScreen();
Print ("Bootable Partitions:\r\n");
PrintRepeatedChar ('\xC4', 20);
Print ("\r\n");
for (size_t i = 0; i < bootablePartitionCount; ++i)
{
const Partition &partition = bootablePartitions[i];
Print ("["); Print (i + 1); Print ("] ");
Print ("Drive: "); Print (partition.Drive - TC_FIRST_BIOS_DRIVE);
Print (", Partition: "); Print (partition.Number + 1);
Print (", Size: "); PrintSectorCountInMB (partition.SectorCount); PrintEndl();
}
if (bootablePartitionCount == 1)
{
// There's only one bootable partition so we'll boot it directly instead of showing boot manager
partChar = '1';
}
else
{
Print ("[Esc] Cancel\r\n\r\n");
Print ("Press 1-9 to select partition: ");
if (GetString (&partChar, 1) == 0)
return;
PrintEndl();
if (partChar < '1' || partChar > '0' + bootablePartitionCount)
{
Beep();
continue;
}
}
const Partition &partition = bootablePartitions[partChar - '0' - 1];
if (ReadSectors (SectorBuffer, partition.Drive, partition.StartSector, 1) == BiosResultSuccess)
{
ExecuteBootSector (partition.Drive, SectorBuffer);
}
}
}
#ifndef TC_WINDOWS_BOOT_RESCUE_DISK_MODE
static bool CopySystemPartitionToHiddenVolume (byte drive, byte &exitKey)
{
bool status = false;
uint64 sectorsRemaining;
uint64 sectorOffset;
sectorOffset.LowPart = 0;
sectorOffset.HighPart = 0;
int fragmentSectorCount = 0x7f; // Maximum safe value supported by BIOS
int statCount;
if (!CheckMemoryRequirements ())
goto err;
if (!GetSystemPartitions (drive))
goto err;
if (PartitionFollowingActive.Drive == TC_INVALID_BIOS_DRIVE)
TC_THROW_FATAL_EXCEPTION;
// Check if BIOS can read the last sector of the hidden system
AcquireSectorBuffer();
if (ReadSectors (SectorBuffer, PartitionFollowingActive.Drive, PartitionFollowingActive.EndSector - (TC_VOLUME_HEADER_GROUP_SIZE / TC_LB_SIZE - 2), 1) != BiosResultSuccess
|| GetCrc32 (SectorBuffer, sizeof (SectorBuffer)) != OuterVolumeBackupHeaderCrc)
{
PrintErrorNoEndl ("Your BIOS does not support large drives");
Print (IsLbaSupported (PartitionFollowingActive.Drive) ? " due to a bug" : "\r\n- Enable LBA in BIOS");
PrintEndl();
Print (TC_BOOT_STR_UPGRADE_BIOS);
ReleaseSectorBuffer();
goto err;
}
ReleaseSectorBuffer();
if (!MountVolume (drive, exitKey, true, false))
return false;
sectorsRemaining = EncryptedVirtualPartition.SectorCount;
if (!(sectorsRemaining == ActivePartition.SectorCount))
TC_THROW_FATAL_EXCEPTION;
InitScreen();
Print ("\r\nCopying system to hidden volume. To abort, press Esc.\r\n\r\n");
while (sectorsRemaining.HighPart != 0 || sectorsRemaining.LowPart != 0)
{
if (EscKeyPressed())
{
Print ("\rIf aborted, copying will have to start from the beginning (if attempted again).\r\n");
if (AskYesNo ("Abort"))
break;
}
if (sectorsRemaining.HighPart == 0 && sectorsRemaining.LowPart < fragmentSectorCount)
fragmentSectorCount = (int) sectorsRemaining.LowPart;
if (ReadWriteSectors (false, TC_BOOT_LOADER_BUFFER_SEGMENT, 0, drive, ActivePartition.StartSector + sectorOffset, fragmentSectorCount, false) != BiosResultSuccess)
{
Print ("To fix bad sectors: 1) Terminate 2) Encrypt and decrypt sys partition 3) Retry\r\n");
crypto_close (BootCryptoInfo);
goto err;
}
AcquireSectorBuffer();
for (int i = 0; i < fragmentSectorCount; ++i)
{
CopyMemory (TC_BOOT_LOADER_BUFFER_SEGMENT, i * TC_LB_SIZE, SectorBuffer, TC_LB_SIZE);
uint64 s = HiddenVolumeStartUnitNo + sectorOffset + i;
EncryptDataUnits (SectorBuffer, &s, 1, BootCryptoInfo);
CopyMemory (SectorBuffer, TC_BOOT_LOADER_BUFFER_SEGMENT, i * TC_LB_SIZE, TC_LB_SIZE);
}
ReleaseSectorBuffer();
if (ReadWriteSectors (true, TC_BOOT_LOADER_BUFFER_SEGMENT, 0, drive, HiddenVolumeStartSector + sectorOffset, fragmentSectorCount, false) != BiosResultSuccess)
{
crypto_close (BootCryptoInfo);
goto err;
}
sectorsRemaining = sectorsRemaining - fragmentSectorCount;
sectorOffset = sectorOffset + fragmentSectorCount;
if (!(statCount++ & 0xf))
{
Print ("\rRemaining: ");
PrintSectorCountInMB (sectorsRemaining);
}
}
crypto_close (BootCryptoInfo);
if (sectorsRemaining.HighPart == 0 && sectorsRemaining.LowPart == 0)
{
status = true;
Print ("\rCopying completed.");
}
PrintEndl (2);
goto ret;
err:
exitKey = TC_BIOS_KEY_ESC;
GetKeyboardChar();
ret:
EraseMemory ((void *) TC_BOOT_LOADER_ARGS_OFFSET, sizeof (BootArguments));
return status;
}
#else // TC_WINDOWS_BOOT_RESCUE_DISK_MODE
static void DecryptDrive (byte drive)
{
byte exitKey;
if (!MountVolume (drive, exitKey, false, true))
return;
BootArguments *bootArguments = (BootArguments *) TC_BOOT_LOADER_ARGS_OFFSET;
bool headerUpdateRequired = false;
uint64 sectorsRemaining = EncryptedVirtualPartition.EndSector + 1 - EncryptedVirtualPartition.StartSector;
uint64 sector = EncryptedVirtualPartition.EndSector + 1;
int fragmentSectorCount = 0x7f; // Maximum safe value supported by BIOS
int statCount;
bool skipBadSectors = false;
Print ("\r\nUse only if Windows cannot start. Decryption under Windows is much faster\r\n"
"(in TrueCrypt, select 'System' > 'Permanently Decrypt').\r\n\r\n");
if (!AskYesNo ("Decrypt now"))
{
crypto_close (BootCryptoInfo);
goto ret;
}
if (EncryptedVirtualPartition.Drive == TC_INVALID_BIOS_DRIVE)
{
// Drive already decrypted
sectorsRemaining.HighPart = 0;
sectorsRemaining.LowPart = 0;
}
else
{
Print ("\r\nTo safely interrupt and defer decryption, press Esc.\r\n"
"WARNING: You can turn off power only after you press Esc.\r\n\r\n");
}
while (sectorsRemaining.HighPart != 0 || sectorsRemaining.LowPart != 0)
{
if (EscKeyPressed())
break;
if (sectorsRemaining.HighPart == 0 && sectorsRemaining.LowPart < fragmentSectorCount)
fragmentSectorCount = (int) sectorsRemaining.LowPart;
sector = sector - fragmentSectorCount;
if (!(statCount++ & 0xf))
{
Print ("\rRemaining: ");
PrintSectorCountInMB (sectorsRemaining);
}
if (ReadWriteSectors (false, TC_BOOT_LOADER_BUFFER_SEGMENT, 0, drive, sector, fragmentSectorCount, skipBadSectors) == BiosResultSuccess)
{
AcquireSectorBuffer();
for (int i = 0; i < fragmentSectorCount; ++i)
{
CopyMemory (TC_BOOT_LOADER_BUFFER_SEGMENT, i * TC_LB_SIZE, SectorBuffer, TC_LB_SIZE);
uint64 s = sector + i;
DecryptDataUnits (SectorBuffer, &s, 1, BootCryptoInfo);
CopyMemory (SectorBuffer, TC_BOOT_LOADER_BUFFER_SEGMENT, i * TC_LB_SIZE, TC_LB_SIZE);
}
ReleaseSectorBuffer();
if (ReadWriteSectors (true, TC_BOOT_LOADER_BUFFER_SEGMENT, 0, drive, sector, fragmentSectorCount, skipBadSectors) != BiosResultSuccess && !skipBadSectors)
goto askBadSectorSkip;
}
else if (!skipBadSectors)
goto askBadSectorSkip;
sectorsRemaining = sectorsRemaining - fragmentSectorCount;
headerUpdateRequired = true;
continue;
askBadSectorSkip:
if (!AskYesNo ("Skip all bad sectors"))
break;
skipBadSectors = true;
sector = sector + fragmentSectorCount;
fragmentSectorCount = 1;
}
crypto_close (BootCryptoInfo);
if (headerUpdateRequired)
{
AcquireSectorBuffer();
uint64 headerSector;
headerSector.HighPart = 0;
headerSector.LowPart = TC_BOOT_VOLUME_HEADER_SECTOR;
// Update encrypted area size in volume header
CRYPTO_INFO *headerCryptoInfo = crypto_open();
while (ReadSectors (SectorBuffer, drive, headerSector, 1) != BiosResultSuccess);
if (ReadVolumeHeader (TRUE, (char *) SectorBuffer, &bootArguments->BootPassword, NULL, headerCryptoInfo) == 0)
{
DecryptBuffer (SectorBuffer + HEADER_ENCRYPTED_DATA_OFFSET, HEADER_ENCRYPTED_DATA_SIZE, headerCryptoInfo);
uint64 encryptedAreaLength = sectorsRemaining << TC_LB_SIZE_BIT_SHIFT_DIVISOR;
for (int i = 7; i >= 0; --i)
{
SectorBuffer[TC_HEADER_OFFSET_ENCRYPTED_AREA_LENGTH + i] = (byte) encryptedAreaLength.LowPart;
encryptedAreaLength = encryptedAreaLength >> 8;
}
uint32 headerCrc32 = GetCrc32 (SectorBuffer + TC_HEADER_OFFSET_MAGIC, TC_HEADER_OFFSET_HEADER_CRC - TC_HEADER_OFFSET_MAGIC);
for (i = 3; i >= 0; --i)
{
SectorBuffer[TC_HEADER_OFFSET_HEADER_CRC + i] = (byte) headerCrc32;
headerCrc32 >>= 8;
}
EncryptBuffer (SectorBuffer + HEADER_ENCRYPTED_DATA_OFFSET, HEADER_ENCRYPTED_DATA_SIZE, headerCryptoInfo);
}
crypto_close (headerCryptoInfo);
while (WriteSectors (SectorBuffer, drive, headerSector, 1) != BiosResultSuccess);
ReleaseSectorBuffer();
}
if (sectorsRemaining.HighPart == 0 && sectorsRemaining.LowPart == 0)
Print ("\rDrive decrypted.\r\n");
else
Print ("\r\nDecryption deferred.\r\n");
GetKeyboardChar();
ret:
EraseMemory (bootArguments, sizeof (*bootArguments));
}
static void RepairMenu ()
{
DriveGeometry bootLoaderDriveGeometry;
if (GetDriveGeometry (BootLoaderDrive, bootLoaderDriveGeometry, true) != BiosResultSuccess)
{
// Some BIOSes may fail to get the geometry of an emulated floppy drive
bootLoaderDriveGeometry.Cylinders = 80;
bootLoaderDriveGeometry.Heads = 2;
bootLoaderDriveGeometry.Sectors = 18;
}
while (true)
{
InitScreen();
Print ("Available "); Print ("Repair Options"); Print (":\r\n");
PrintRepeatedChar ('\xC4', 25);
PrintEndl();
enum
{
RestoreNone = 0,
DecryptVolume,
RestoreTrueCryptLoader,
RestoreVolumeHeader,
RestoreOriginalSystemLoader
};
static const char *options[] = { "Permanently decrypt system partition/drive", "Restore TrueCrypt Boot Loader", "Restore key data (volume header)", "Restore original system loader" };
int selection = AskSelection (options,
(BootSectorFlags & TC_BOOT_CFG_FLAG_RESCUE_DISK_ORIG_SYS_LOADER) ? array_capacity (options) : array_capacity (options) - 1);
PrintEndl();
switch (selection)
{
case RestoreNone:
return;
case DecryptVolume:
DecryptDrive (BootDrive);
continue;
case RestoreOriginalSystemLoader:
if (!AskYesNo ("Is the system partition/drive decrypted"))
{
Print ("Please decrypt it first.\r\n");
GetKeyboardChar();
continue;
}
break;
}
bool writeConfirmed = false;
BiosResult result;
uint64 sector;
sector.HighPart = 0;
ChsAddress chs;
byte mbrPartTable[TC_LB_SIZE - TC_MAX_MBR_BOOT_CODE_SIZE];
AcquireSectorBuffer();
for (int i = (selection == RestoreVolumeHeader ? TC_BOOT_VOLUME_HEADER_SECTOR : TC_MBR_SECTOR);
i < TC_BOOT_LOADER_AREA_SECTOR_COUNT; ++i)
{
sector.LowPart = i;
if (selection == RestoreOriginalSystemLoader)
sector.LowPart += TC_ORIG_BOOT_LOADER_BACKUP_SECTOR;
else if (selection == RestoreTrueCryptLoader)
sector.LowPart += TC_BOOT_LOADER_BACKUP_RESCUE_DISK_SECTOR;
// The backup medium may be a floppy-emulated bootable CD. The emulation may fail if LBA addressing is used.
// Therefore, only CHS addressing can be used.
LbaToChs (bootLoaderDriveGeometry, sector, chs);
sector.LowPart = i;
if (i == TC_MBR_SECTOR)
{
// Read current partition table
result = ReadSectors (SectorBuffer, TC_FIRST_BIOS_DRIVE, sector, 1);
if (result != BiosResultSuccess)
goto err;
memcpy (mbrPartTable, SectorBuffer + TC_MAX_MBR_BOOT_CODE_SIZE, sizeof (mbrPartTable));
}
result = ReadSectors (SectorBuffer, BootLoaderDrive, chs, 1);
if (result != BiosResultSuccess)
goto err;
if (i == TC_MBR_SECTOR)
{
// Preserve current partition table
memcpy (SectorBuffer + TC_MAX_MBR_BOOT_CODE_SIZE, mbrPartTable, sizeof (mbrPartTable));
}
// Volume header
if (i == TC_BOOT_VOLUME_HEADER_SECTOR)
{
if (selection == RestoreTrueCryptLoader)
continue;
if (selection == RestoreVolumeHeader)
{
while (true)
{
bool validHeaderPresent = false;
uint32 masterKeyScheduleCrc;
Password password;
byte exitKey = AskPassword (password);
if (exitKey != TC_BIOS_KEY_ENTER)
goto abort;
CRYPTO_INFO *cryptoInfo;
CopyMemory (SectorBuffer, TC_BOOT_LOADER_BUFFER_SEGMENT, 0, TC_LB_SIZE);
ReleaseSectorBuffer();
// Restore volume header only if the current one cannot be used
if (OpenVolume (TC_FIRST_BIOS_DRIVE, password, &cryptoInfo, nullptr, false, true))
{
validHeaderPresent = true;
masterKeyScheduleCrc = GetCrc32 (cryptoInfo->ks, sizeof (cryptoInfo->ks));
crypto_close (cryptoInfo);
}
AcquireSectorBuffer();
CopyMemory (TC_BOOT_LOADER_BUFFER_SEGMENT, 0, SectorBuffer, TC_LB_SIZE);
if (ReadVolumeHeader (TRUE, (char *) SectorBuffer, &password, &cryptoInfo, nullptr) == 0)
{
if (validHeaderPresent)
{
if (masterKeyScheduleCrc == GetCrc32 (cryptoInfo->ks, sizeof (cryptoInfo->ks)))
{
Print ("Original header preserved.\r\n");
goto err;
}
Print ("WARNING: Drive 0 contains a valid header!\r\n");
}
crypto_close (cryptoInfo);
break;
}
Print ("Incorrect password.\r\n\r\n");
}
}
}
if (!writeConfirmed && !AskYesNo ("Modify drive 0"))
goto abort;
writeConfirmed = true;