/*
QueryVolumeInfo
Retrieves the free disk space and file size limit on the truecrypt volume host
Parameters:
hwndDlg : HWND
[in] handle to parent window
lpszVolume : char *
[in] Pointer to a string that contains the volume path
pHostSizeFree : uint64 *
[out] returns the free space available on the host (always zero for devices)
pSizeLimitFS : uint64 *
[out] returns the file size limit of the host file system
Return value:
int with TrueCrypt error code (ERR_SUCCESS on success)
*/
int QueryVolumeInfo (HWND hwndDlg, const char *lpszVolume, uint64 * pHostSizeFree, uint64 * pSizeLimitFS )
{
int nStatus = ERR_OS_ERROR;
char szDiskFile[TC_MAX_PATH], root[MAX_PATH];
BOOL bDevice;
enum EV_FileSystem fs;
*pSizeLimitFS = (uint64)-1;
CreateFullVolumePath (szDiskFile, sizeof(szDiskFile), lpszVolume, &bDevice);
if (bDevice)
{
*pHostSizeFree=0;
return ERR_SUCCESS;
}
if (!GetVolumePathName (szDiskFile, root, sizeof (root)))
{
nStatus = ERR_OS_ERROR;
goto error;
}
if( ! GetDiskFreeSpaceEx (root,(PULARGE_INTEGER)pHostSizeFree,NULL,NULL) )
{
nStatus = ERR_OS_ERROR;
goto error;
}
if ( ! GetFileSystemType(root,&fs) )
{
nStatus = ERR_OS_ERROR;
goto error;
}
/* file size limits
FAT16 / FAT32 : 4 GB minus 1 byte (2^32 bytes minus 1 byte)
NTFS : Architecturally : 16 exabytes minus 1 KB (26^4 bytes minus 1 KB)
Implementation (Windows Server 2008): 16 terabytes minus 64 KB (2^44 bytes minus 64 KB)
*/
switch (fs)
{
case EV_FS_TYPE_NTFS:
*pSizeLimitFS = 16 * BYTES_PER_TB - 64 * BYTES_PER_KB;
break;
case EV_FS_TYPE_FAT:
*pSizeLimitFS = 4 * BYTES_PER_GB - 1;
break;
default:
*pSizeLimitFS = (uint64)-1;
}
nStatus = ERR_SUCCESS;
error:
return nStatus;
}
/*
ExpandVolume
Sets the volume size in the volume header (and backup header) to a larger value,
and resizes the filesystem within the volume (only NTFS supported)
Parameters:
hwndDlg : HWND
[in] handle to progress dialog
lpszVolume : char *
[in] Pointer to a string that contains the path to the truecrypt volume
pVolumePassword : Password *
[in] Pointer to the volume password
newHostSize : uint64
[in] new value of the volume host size (can be zero for devices,
which means the volume should use all space of the host device)
initFreeSpace : BOOL
[in] if true, the new volume space will be initalized with random data
Return value:
int with Truecrypt error code (ERR_SUCCESS on success)
Remarks: a lot of code is from TrueCrypt 'Common\Password.c' :: ChangePwd()
*/
static int ExpandVolume (HWND hwndDlg, wchar_t *lpszVolume, Password *pVolumePassword, int VolumePkcs5, int VolumePim, uint64 newHostSize, BOOL initFreeSpace)
{
int nDosLinkCreated = 1, nStatus = ERR_OS_ERROR;
wchar_t szDiskFile[TC_MAX_PATH], szCFDevice[TC_MAX_PATH];
wchar_t szDosDevice[TC_MAX_PATH];
char buffer[TC_VOLUME_HEADER_EFFECTIVE_SIZE];
PCRYPTO_INFO cryptoInfo = NULL, ci = NULL;
void *dev = INVALID_HANDLE_VALUE;
DWORD dwError;
BOOL bDevice;
uint64 hostSize=0, newDataAreaSize, currentVolSize;
DWORD HostSectorSize;
FILETIME ftCreationTime;
FILETIME ftLastWriteTime;
FILETIME ftLastAccessTime;
BOOL bTimeStampValid = FALSE;
LARGE_INTEGER headerOffset;
BOOL backupHeader;
byte *wipeBuffer = NULL;
uint32 workChunkSize = TC_VOLUME_HEADER_GROUP_SIZE;
if (pVolumePassword->Length == 0) return -1;
WaitCursor ();
CreateFullVolumePath (szDiskFile, sizeof(szDiskFile), lpszVolume, &bDevice);
if (bDevice == FALSE)
{
wcscpy (szCFDevice, szDiskFile);
}
else
{
nDosLinkCreated = FakeDosNameForDevice (szDiskFile, szDosDevice, sizeof(szDosDevice), szCFDevice, sizeof(szCFDevice), FALSE);
if (nDosLinkCreated != 0) // note: nStatus == ERR_OS_ERROR
goto error;
}
dev = CreateFile (szCFDevice, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
if (dev == INVALID_HANDLE_VALUE)
goto error;
if (bDevice)
{
/* This is necessary to determine the hidden volume header offset */
if (dev == INVALID_HANDLE_VALUE)
{
goto error;
}
else
{
PARTITION_INFORMATION diskInfo;
DWORD dwResult;
BOOL bResult;
bResult = GetPartitionInfo (lpszVolume, &diskInfo);
if (bResult)
{
hostSize = diskInfo.PartitionLength.QuadPart;
HostSectorSize = TC_SECTOR_SIZE_FILE_HOSTED_VOLUME; //TO DO: get the real host disk sector size
}
else
{
DISK_GEOMETRY driveInfo;
bResult = DeviceIoControl (dev, IOCTL_DISK_GET_DRIVE_GEOMETRY, NULL, 0,
&driveInfo, sizeof (driveInfo), &dwResult, NULL);
if (!bResult)
goto error;
hostSize = driveInfo.Cylinders.QuadPart * driveInfo.BytesPerSector *
driveInfo.SectorsPerTrack * driveInfo.TracksPerCylinder;
HostSectorSize = driveInfo.BytesPerSector;
}
if (hostSize == 0)
{
nStatus = ERR_VOL_SIZE_WRONG;
goto error;
}
}
}
else
{
LARGE_INTEGER fileSize;
if (!GetFileSizeEx (dev, &fileSize))
{
nStatus = ERR_OS_ERROR;
goto error;
}
hostSize = fileSize.QuadPart;
HostSectorSize = TC_SECTOR_SIZE_FILE_HOSTED_VOLUME; //TO DO: get the real host disk sector size
}
if (Randinit ())
{
if (CryptoAPILastError == ERROR_SUCCESS)
nStatus = ERR_RAND_INIT_FAILED;
else
nStatus = ERR_CAPI_INIT_FAILED;
goto error;
}
if (!bDevice && bPreserveTimestamp)
{
/* Remember the container modification/creation date and time, (used to reset file date and time of
file-hosted volumes after password change (or attempt to), in order to preserve plausible deniability
of hidden volumes (last password change time is stored in the volume header). */
if (GetFileTime ((HANDLE) dev, &ftCreationTime, &ftLastAccessTime, &ftLastWriteTime) == 0)
{
bTimeStampValid = FALSE;
MessageBoxW (hwndDlg, GetString ("GETFILETIME_FAILED_PW"), lpszTitle, MB_OK | MB_ICONEXCLAMATION);
}
else
bTimeStampValid = TRUE;
}
// Seek the volume header
headerOffset.QuadPart = TC_VOLUME_HEADER_OFFSET;
if (!SetFilePointerEx ((HANDLE) dev, headerOffset, NULL, FILE_BEGIN))
{
nStatus = ERR_OS_ERROR;
goto error;
}
/* Read in volume header */
nStatus = _lread ((HFILE) dev, buffer, sizeof (buffer));
if (nStatus != sizeof (buffer))
{
// Windows may report EOF when reading sectors from the last cluster of a device formatted as NTFS
memset (buffer, 0, sizeof (buffer));
}
/* Try to decrypt the header */
nStatus = ReadVolumeHeader (FALSE, buffer, pVolumePassword, VolumePkcs5, VolumePim, FALSE, &cryptoInfo, NULL);
if (nStatus == ERR_CIPHER_INIT_WEAK_KEY)
nStatus = 0; // We can ignore this error here
if (nStatus != 0)
{
cryptoInfo = NULL;
goto error;
}
if (cryptoInfo->HeaderFlags & TC_HEADER_FLAG_ENCRYPTED_SYSTEM)
{
nStatus = ERR_SYS_HIDVOL_HEAD_REENC_MODE_WRONG;
goto error;
}
if (bDevice && newHostSize == 0)
{
// this means we shall take all host space as new volume size
newHostSize = hostSize;
}
if ( newHostSize % cryptoInfo->SectorSize != 0 || newHostSize > TC_MAX_VOLUME_SIZE || (bDevice && newHostSize > hostSize) )
{
// 1. must be multiple of sector size
// 2. truecrypt volume size limit
// 3. for devices volume size can't be larger than host size
cryptoInfo = NULL;
nStatus = ERR_PARAMETER_INCORRECT;
goto error;
}
newDataAreaSize = GetVolumeDataAreaSize (newHostSize, cryptoInfo->LegacyVolume);
if (cryptoInfo->LegacyVolume)
{
if (bDevice)
{
if (initFreeSpace)
{
// unsupported
cryptoInfo = NULL;
nStatus = ERR_PARAMETER_INCORRECT;
goto error;
}
else
{
// note: dummy value (only used for parameter checks)
cryptoInfo->VolumeSize.Value = newDataAreaSize - TC_MINVAL_FS_EXPAND;
}
}
else
{
cryptoInfo->VolumeSize.Value = GetVolumeDataAreaSize (hostSize, TRUE);
}
}
currentVolSize = GetVolumeSizeByDataAreaSize (cryptoInfo->VolumeSize.Value, cryptoInfo->LegacyVolume);
if ( newDataAreaSize < cryptoInfo->VolumeSize.Value + TC_MINVAL_FS_EXPAND )
{
// shrinking a volume or enlarging by less then TC_MINVAL_FS_EXPAND is not allowed
cryptoInfo = NULL;
nStatus = ERR_PARAMETER_INCORRECT;
goto error;
}
InitProgressBar ( newHostSize, currentVolSize, FALSE, FALSE, FALSE, TRUE);
if (bVolTransformThreadCancel)
{
SetLastError(0);
nStatus = ERR_USER_ABORT;
goto error;
}
if (!bDevice) {
LARGE_INTEGER liNewSize;
liNewSize.QuadPart=(LONGLONG)newHostSize;
// Preallocate the file
if (!SetFilePointerEx (dev, liNewSize, NULL, FILE_BEGIN)
|| !SetEndOfFile (dev)
|| SetFilePointer (dev, 0, NULL, FILE_BEGIN) != 0)
{
nStatus = ERR_OS_ERROR;
goto error;
}
}
if (initFreeSpace)
{
uint64 startSector;
int64 num_sectors;
// fill new space with random data
startSector = currentVolSize/HostSectorSize ;
num_sectors = (newHostSize/HostSectorSize) - startSector;
if (bDevice && !StartFormatWriteThread())
{
nStatus = ERR_OS_ERROR;
goto error;
}
DebugAddProgressDlgStatus(hwndDlg, L"Writing random data to new space ...\r\n");
SetFormatSectorSize(HostSectorSize);
nStatus = FormatNoFs (hwndDlg, startSector, num_sectors, dev, cryptoInfo, FALSE);
dwError = GetLastError();
StopFormatWriteThread();
SetLastError (dwError);
}
else
{
UpdateProgressBar(newHostSize);
}
if (nStatus != ERR_SUCCESS)
{
dwError = GetLastError();
DebugAddProgressDlgStatus(hwndDlg, L"Error: failed to write random data ...\r\n");
if ( !bDevice ) {
// restore original size of the container file
LARGE_INTEGER liOldSize;
liOldSize.QuadPart=(LONGLONG)hostSize;
if (!SetFilePointerEx (dev, liOldSize, NULL, FILE_BEGIN) || !SetEndOfFile (dev))
{
DebugAddProgressDlgStatus(hwndDlg, L"Warning: failed to restore original size of the container file\r\n");
}
}
SetLastError (dwError);
goto error;
}
RandSetHashFunction (cryptoInfo->pkcs5);
// Re-encrypt the volume header forn non-legacy volumes: backup header first
backupHeader = TRUE;
headerOffset.QuadPart = TC_VOLUME_HEADER_OFFSET + newHostSize - TC_VOLUME_HEADER_GROUP_SIZE;
/* note: updating the header is not neccessary for legay volumes */
while ( !cryptoInfo->LegacyVolume )
{
if (backupHeader)
DebugAddProgressDlgStatus(hwndDlg, L"Writing re-encrypted backup header ...\r\n");
else
DebugAddProgressDlgStatus(hwndDlg, L"Writing re-encrypted primary header ...\r\n");
// Prepare new volume header
nStatus = CreateVolumeHeaderInMemory (hwndDlg, FALSE,
buffer,
cryptoInfo->ea,
cryptoInfo->mode,
pVolumePassword,
cryptoInfo->pkcs5,
VolumePim,
(char*)(cryptoInfo->master_keydata),
&ci,
newDataAreaSize,
0, // hiddenVolumeSize
cryptoInfo->EncryptedAreaStart.Value,
newDataAreaSize,
cryptoInfo->RequiredProgramVersion,
cryptoInfo->HeaderFlags,
cryptoInfo->SectorSize,
TRUE ); // use slow poll
if (ci != NULL)
crypto_close (ci);
if (nStatus != 0)
goto error;
if (!SetFilePointerEx ((HANDLE) dev, headerOffset, NULL, FILE_BEGIN))
{
nStatus = ERR_OS_ERROR;
goto error;
}
nStatus = _lwrite ((HFILE) dev, buffer, TC_VOLUME_HEADER_EFFECTIVE_SIZE);
if (nStatus != TC_VOLUME_HEADER_EFFECTIVE_SIZE)
{
nStatus = ERR_OS_ERROR;
goto error;
}
if ( ( backupHeader && !initFreeSpace )
|| ( bDevice
&& !cryptoInfo->LegacyVolume
&& !cryptoInfo->hiddenVolume
&& cryptoInfo->HeaderVersion == 4 // BUG in TrueCrypt: doing this only for v4 make no sense
&& (cryptoInfo->HeaderFlags & TC_HEADER_FLAG_NONSYS_INPLACE_ENC) != 0
&& (cryptoInfo->HeaderFlags & ~TC_HEADER_FLAG_NONSYS_INPLACE_ENC) == 0 )
)
{
//DebugAddProgressDlgStatus(hwndDlg, L"WriteRandomDataToReservedHeaderAreas() ...\r\n");
nStatus = WriteRandomDataToReservedHeaderAreas (hwndDlg, dev, cryptoInfo, newDataAreaSize, !backupHeader, backupHeader);
if (nStatus != ERR_SUCCESS)
goto error;
}
FlushFileBuffers (dev);
if (!backupHeader)
break;
backupHeader = FALSE;
headerOffset.QuadPart = TC_VOLUME_HEADER_OFFSET; // offset for main header
}
/* header successfully updated */
nStatus = ERR_SUCCESS;
if (bVolTransformThreadCancel)
{
nStatus = ERR_USER_ABORT;
goto error;
}
/* wipe old backup header */
if ( !cryptoInfo->LegacyVolume )
{
byte wipeRandChars [TC_WIPE_RAND_CHAR_COUNT];
byte wipeRandCharsUpdate [TC_WIPE_RAND_CHAR_COUNT];
byte wipePass;
UINT64_STRUCT unitNo;
LARGE_INTEGER offset;
WipeAlgorithmId wipeAlgorithm = TC_WIPE_35_GUTMANN;
if ( !RandgetBytes (hwndDlg, wipeRandChars, TC_WIPE_RAND_CHAR_COUNT, TRUE)
|| !RandgetBytes (hwndDlg, wipeRandCharsUpdate, TC_WIPE_RAND_CHAR_COUNT, TRUE)
)
{
nStatus = ERR_OS_ERROR;
goto error;
}
DebugAddProgressDlgStatus(hwndDlg, L"Wiping old backup header ...\r\n");
wipeBuffer = (byte *) TCalloc (workChunkSize);
if (!wipeBuffer)
{
nStatus = ERR_OUTOFMEMORY;
goto error;
}
offset.QuadPart = currentVolSize - TC_VOLUME_HEADER_GROUP_SIZE;
unitNo.Value = offset.QuadPart;
for (wipePass = 1; wipePass <= GetWipePassCount (wipeAlgorithm); ++wipePass)
{
if (!WipeBuffer (wipeAlgorithm, wipeRandChars, wipePass, wipeBuffer, workChunkSize))
{
ULONG i;
for (i = 0; i < workChunkSize; ++i)
{
wipeBuffer[i] = wipePass;
}
EncryptDataUnits (wipeBuffer, &unitNo, workChunkSize / ENCRYPTION_DATA_UNIT_SIZE, cryptoInfo);
memcpy (wipeRandCharsUpdate, wipeBuffer, sizeof (wipeRandCharsUpdate));
}
if ( !SetFilePointerEx (dev, offset, NULL, FILE_BEGIN)
|| _lwrite ((HFILE)dev, (LPCSTR)wipeBuffer, workChunkSize) == HFILE_ERROR
)
{
// Write error
DebugAddProgressDlgStatus(hwndDlg, L"Warning: Failed to wipe old backup header\r\n");
MessageBoxW (hwndDlg, L"WARNING: Failed to wipe old backup header!\n\nIt may be possible to use the current volume password to decrypt the old backup header even after a future password change.\n", lpszTitle, MB_OK | MB_ICONEXCLAMATION);
if (wipePass == 1)
continue; // retry once
// non-critical error - it's better to continue
nStatus = ERR_SUCCESS;
goto error;
}
FlushFileBuffers(dev);
// we don't check FlushFileBuffers() return code, because it fails for devices
// (same implementation in password.c - a bug or not ???)
}
burn (wipeRandChars, TC_WIPE_RAND_CHAR_COUNT);
burn (wipeRandCharsUpdate, TC_WIPE_RAND_CHAR_COUNT);
}
error:
dwError = GetLastError ();
if (wipeBuffer)
{
burn (wipeBuffer, workChunkSize);
TCfree (wipeBuffer);
wipeBuffer = NULL;
}
burn (buffer, sizeof (buffer));
if (cryptoInfo != NULL)
crypto_close (cryptoInfo);
if (bTimeStampValid)
{
// Restore the container timestamp (to preserve plausible deniability of possible hidden volume).
if (SetFileTime (dev, &ftCreationTime, &ftLastAccessTime, &ftLastWriteTime) == 0)
MessageBoxW (hwndDlg, GetString ("SETFILETIME_FAILED_PW"), lpszTitle, MB_OK | MB_ICONEXCLAMATION);
}
if (dev != INVALID_HANDLE_VALUE)
CloseHandle ((HANDLE) dev);
if (nDosLinkCreated == 0)
RemoveFakeDosName (szDiskFile, szDosDevice);
RandStop (FALSE);
if (bVolTransformThreadCancel)
nStatus = ERR_USER_ABORT;
SetLastError (dwError);
if (nStatus == ERR_SUCCESS)
{
nStatus = ExtendFileSystem (hwndDlg, lpszVolume, pVolumePassword, VolumePkcs5, VolumePim, newDataAreaSize);
}
return nStatus;
}
int ChangePwd (const char *lpszVolume, Password *oldPassword, int old_pkcs5, int old_pim, BOOL truecryptMode, Password *newPassword, int pkcs5, int pim, int wipePassCount, HWND hwndDlg)
{
int nDosLinkCreated = 1, nStatus = ERR_OS_ERROR;
char szDiskFile[TC_MAX_PATH], szCFDevice[TC_MAX_PATH];
char szDosDevice[TC_MAX_PATH];
char buffer[TC_VOLUME_HEADER_EFFECTIVE_SIZE];
PCRYPTO_INFO cryptoInfo = NULL, ci = NULL;
void *dev = INVALID_HANDLE_VALUE;
DWORD dwError;
DWORD bytesRead;
BOOL bDevice;
unsigned __int64 hostSize = 0;
int volumeType;
int wipePass;
FILETIME ftCreationTime;
FILETIME ftLastWriteTime;
FILETIME ftLastAccessTime;
BOOL bTimeStampValid = FALSE;
LARGE_INTEGER headerOffset;
BOOL backupHeader;
DISK_GEOMETRY driveInfo;
if (oldPassword->Length == 0 || newPassword->Length == 0) return -1;
if ((wipePassCount <= 0) || (truecryptMode && (old_pkcs5 == SHA256)))
{
nStatus = ERR_PARAMETER_INCORRECT;
handleError (hwndDlg, nStatus, SRC_POS);
return nStatus;
}
if (!lpszVolume)
{
nStatus = ERR_OUTOFMEMORY;
handleError (hwndDlg, nStatus, SRC_POS);
return nStatus;
}
WaitCursor ();
CreateFullVolumePath (szDiskFile, sizeof(szDiskFile), lpszVolume, &bDevice);
if (bDevice == FALSE)
{
strcpy (szCFDevice, szDiskFile);
}
else
{
nDosLinkCreated = FakeDosNameForDevice (szDiskFile, szDosDevice, sizeof(szDosDevice), szCFDevice, sizeof(szCFDevice),FALSE);
if (nDosLinkCreated != 0)
goto error;
}
dev = CreateFile (szCFDevice, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
if (dev == INVALID_HANDLE_VALUE)
goto error;
if (bDevice)
{
/* This is necessary to determine the hidden volume header offset */
if (dev == INVALID_HANDLE_VALUE)
{
goto error;
}
else
{
PARTITION_INFORMATION diskInfo;
DWORD dwResult;
BOOL bResult;
bResult = DeviceIoControl (dev, IOCTL_DISK_GET_DRIVE_GEOMETRY, NULL, 0,
&driveInfo, sizeof (driveInfo), &dwResult, NULL);
if (!bResult)
goto error;
bResult = GetPartitionInfo (lpszVolume, &diskInfo);
if (bResult)
{
hostSize = diskInfo.PartitionLength.QuadPart;
}
else
{
hostSize = driveInfo.Cylinders.QuadPart * driveInfo.BytesPerSector *
driveInfo.SectorsPerTrack * driveInfo.TracksPerCylinder;
}
if (hostSize == 0)
{
nStatus = ERR_VOL_SIZE_WRONG;
goto error;
}
}
}
else
{
LARGE_INTEGER fileSize;
if (!GetFileSizeEx (dev, &fileSize))
{
nStatus = ERR_OS_ERROR;
goto error;
}
hostSize = fileSize.QuadPart;
}
if (Randinit ())
{
if (CryptoAPILastError == ERROR_SUCCESS)
nStatus = ERR_RAND_INIT_FAILED;
else
nStatus = ERR_CAPI_INIT_FAILED;
goto error;
}
SetRandomPoolEnrichedByUserStatus (FALSE); /* force the display of the random enriching dialog */
if (!bDevice && bPreserveTimestamp)
{
if (GetFileTime ((HANDLE) dev, &ftCreationTime, &ftLastAccessTime, &ftLastWriteTime) == 0)
bTimeStampValid = FALSE;
else
bTimeStampValid = TRUE;
}
for (volumeType = TC_VOLUME_TYPE_NORMAL; volumeType < TC_VOLUME_TYPE_COUNT; volumeType++)
{
// Seek the volume header
switch (volumeType)
{
case TC_VOLUME_TYPE_NORMAL:
headerOffset.QuadPart = TC_VOLUME_HEADER_OFFSET;
break;
case TC_VOLUME_TYPE_HIDDEN:
if (TC_HIDDEN_VOLUME_HEADER_OFFSET + TC_VOLUME_HEADER_SIZE > hostSize)
continue;
headerOffset.QuadPart = TC_HIDDEN_VOLUME_HEADER_OFFSET;
break;
}
if (!SetFilePointerEx ((HANDLE) dev, headerOffset, NULL, FILE_BEGIN))
{
nStatus = ERR_OS_ERROR;
goto error;
}
/* Read in volume header */
if (!ReadEffectiveVolumeHeader (bDevice, dev, buffer, &bytesRead))
{
nStatus = ERR_OS_ERROR;
goto error;
}
if (bytesRead != sizeof (buffer))
{
// Windows may report EOF when reading sectors from the last cluster of a device formatted as NTFS
memset (buffer, 0, sizeof (buffer));
}
/* Try to decrypt the header */
nStatus = ReadVolumeHeader (FALSE, buffer, oldPassword, old_pkcs5, old_pim, truecryptMode, &cryptoInfo, NULL);
if (nStatus == ERR_CIPHER_INIT_WEAK_KEY)
nStatus = 0; // We can ignore this error here
if (nStatus == ERR_PASSWORD_WRONG)
{
continue; // Try next volume type
}
else if (nStatus != 0)
{
cryptoInfo = NULL;
goto error;
}
else
break;
}
if (nStatus != 0)
{
cryptoInfo = NULL;
goto error;
}
if (cryptoInfo->HeaderFlags & TC_HEADER_FLAG_ENCRYPTED_SYSTEM)
{
nStatus = ERR_SYS_HIDVOL_HEAD_REENC_MODE_WRONG;
goto error;
}
// Change the PKCS-5 PRF if requested by user
if (pkcs5 != 0)
cryptoInfo->pkcs5 = pkcs5;
RandSetHashFunction (cryptoInfo->pkcs5);
NormalCursor();
UserEnrichRandomPool (hwndDlg);
EnableElevatedCursorChange (hwndDlg);
WaitCursor();
/* Re-encrypt the volume header */
backupHeader = FALSE;
while (TRUE)
{
/* The header will be re-encrypted wipePassCount times to prevent adversaries from using
techniques such as magnetic force microscopy or magnetic force scanning tunnelling microscopy
to recover the overwritten header. According to Peter Gutmann, data should be overwritten 22
times (ideally, 35 times) using non-random patterns and pseudorandom data. However, as users might
impatiently interupt the process (etc.) we will not use the Gutmann's patterns but will write the
valid re-encrypted header, i.e. pseudorandom data, and there will be many more passes than Guttman
recommends. During each pass we will write a valid working header. Each pass will use the same master
key, and also the same header key, secondary key (XTS), etc., derived from the new password. The only
item that will be different for each pass will be the salt. This is sufficient to cause each "version"
of the header to differ substantially and in a random manner from the versions written during the
other passes. */
for (wipePass = 0; wipePass < wipePassCount; wipePass++)
{
// Prepare new volume header
nStatus = CreateVolumeHeaderInMemory (hwndDlg, FALSE,
buffer,
cryptoInfo->ea,
cryptoInfo->mode,
newPassword,
cryptoInfo->pkcs5,
pim,
cryptoInfo->master_keydata,
&ci,
cryptoInfo->VolumeSize.Value,
(volumeType == TC_VOLUME_TYPE_HIDDEN) ? cryptoInfo->hiddenVolumeSize : 0,
cryptoInfo->EncryptedAreaStart.Value,
cryptoInfo->EncryptedAreaLength.Value,
truecryptMode? 0 : cryptoInfo->RequiredProgramVersion,
cryptoInfo->HeaderFlags,
cryptoInfo->SectorSize,
wipePass < wipePassCount - 1);
if (ci != NULL)
crypto_close (ci);
if (nStatus != 0)
goto error;
if (!SetFilePointerEx ((HANDLE) dev, headerOffset, NULL, FILE_BEGIN))
{
nStatus = ERR_OS_ERROR;
goto error;
}
if (!WriteEffectiveVolumeHeader (bDevice, dev, buffer))
{
nStatus = ERR_OS_ERROR;
goto error;
}
if (bDevice
&& !cryptoInfo->LegacyVolume
&& !cryptoInfo->hiddenVolume
&& cryptoInfo->HeaderVersion == 4
&& (cryptoInfo->HeaderFlags & TC_HEADER_FLAG_NONSYS_INPLACE_ENC) != 0
&& (cryptoInfo->HeaderFlags & ~TC_HEADER_FLAG_NONSYS_INPLACE_ENC) == 0)
{
nStatus = WriteRandomDataToReservedHeaderAreas (hwndDlg, dev, cryptoInfo, cryptoInfo->VolumeSize.Value, !backupHeader, backupHeader);
if (nStatus != ERR_SUCCESS)
goto error;
}
FlushFileBuffers (dev);
}
if (backupHeader || cryptoInfo->LegacyVolume)
break;
backupHeader = TRUE;
headerOffset.QuadPart += hostSize - TC_VOLUME_HEADER_GROUP_SIZE;
}
/* Password successfully changed */
nStatus = 0;
error:
dwError = GetLastError ();
burn (buffer, sizeof (buffer));
if (cryptoInfo != NULL)
crypto_close (cryptoInfo);
if (bTimeStampValid)
SetFileTime (dev, &ftCreationTime, &ftLastAccessTime, &ftLastWriteTime);
if (dev != INVALID_HANDLE_VALUE)
CloseHandle ((HANDLE) dev);
if (nDosLinkCreated == 0)
RemoveFakeDosName (szDiskFile, szDosDevice);
RandStop (FALSE);
NormalCursor ();
SetLastError (dwError);
if (nStatus == ERR_OS_ERROR && dwError == ERROR_ACCESS_DENIED
&& bDevice
&& !UacElevated
&& IsUacSupported ())
return nStatus;
if (nStatus != 0)
handleError (hwndDlg, nStatus, SRC_POS);
return nStatus;
}