PCRYPTO_INFO crypto_open ()
{
#ifndef GST_WINDOWS_BOOT
/* Do the crt allocation */
PCRYPTO_INFO cryptoInfo = (PCRYPTO_INFO) GSTalloc (sizeof (CRYPTO_INFO));
if (cryptoInfo == NULL)
return NULL;
memset (cryptoInfo, 0, sizeof (CRYPTO_INFO));
#ifndef DEVICE_DRIVER
VirtualLock (cryptoInfo, sizeof (CRYPTO_INFO));
#endif
cryptoInfo->ea = -1;
return cryptoInfo;
#else // GST_WINDOWS_BOOT
#if 0
if (CryptoInfoBufferInUse)
GST_THROW_FATAL_EXCEPTION;
#endif
CryptoInfoBufferInUse = 1;
return &CryptoInfoBuffer;
#endif // GST_WINDOWS_BOOT
}
/* Init the random number generator, setup the hooks, and start the thread */
int Randinit ()
{
if (GetMaxPkcs5OutSize() > RNG_POOL_SIZE)
GST_THROW_FATAL_EXCEPTION;
if(bRandDidInit)
return 0;
InitializeCriticalSection (&critRandProt);
bRandDidInit = TRUE;
if (pRandPool == NULL)
{
pRandPool = (unsigned char *) GSTalloc (RANDOMPOOL_ALLOCSIZE);
if (pRandPool == NULL)
goto error;
bDidSlowPoll = FALSE;
RandomPoolEnrichedByUser = FALSE;
memset (pRandPool, 0, RANDOMPOOL_ALLOCSIZE);
VirtualLock (pRandPool, RANDOMPOOL_ALLOCSIZE);
}
hKeyboard = SetWindowsHookEx (WH_KEYBOARD, (HOOKPROC)&KeyboardProc, NULL, GetCurrentThreadId ());
if (hKeyboard == 0) handleWin32Error (0);
hMouse = SetWindowsHookEx (WH_MOUSE, (HOOKPROC)&MouseProc, NULL, GetCurrentThreadId ());
if (hMouse == 0)
{
handleWin32Error (0);
goto error;
}
if (!CryptAcquireContext (&hCryptProv, NULL, NULL, PROV_RSA_FULL, 0)
&& !CryptAcquireContext (&hCryptProv, NULL, NULL, PROV_RSA_FULL, CRYPT_NEWKEYSET))
CryptoAPIAvailable = FALSE;
else
CryptoAPIAvailable = TRUE;
if (!(PeriodicFastPollThreadHandle = (HANDLE) _beginthreadex (NULL, 0, PeriodicFastPollThreadProc, NULL, 0, NULL)))
goto error;
return 0;
error:
RandStop (TRUE);
return 1;
}
NTSTATUS GSTOpenVolume (PDEVICE_OBJECT DeviceObject,
PEXTENSION Extension,
MOUNT_STRUCT *mount,
PWSTR pwszMountVolume,
BOOL bRawDevice)
{
FILE_STANDARD_INFORMATION FileStandardInfo;
FILE_BASIC_INFORMATION FileBasicInfo;
OBJECT_ATTRIBUTES oaFileAttributes;
UNICODE_STRING FullFileName;
IO_STATUS_BLOCK IoStatusBlock;
PCRYPTO_INFO cryptoInfoPtr = NULL;
PCRYPTO_INFO tmpCryptoInfo = NULL;
LARGE_INTEGER lDiskLength;
__int64 partitionStartingOffset = 0;
int volumeType;
char *readBuffer = 0;
NTSTATUS ntStatus = 0;
BOOL forceAccessCheck = (!bRawDevice && !(OsMajorVersion == 5 &&OsMinorVersion == 0)); // Windows 2000 does not support OBJ_FORCE_ACCESS_CHECK attribute
BOOL disableBuffering = TRUE;
BOOL exclusiveAccess = mount->bExclusiveAccess;
Extension->pfoDeviceFile = NULL;
Extension->hDeviceFile = NULL;
Extension->bTimeStampValid = FALSE;
RtlInitUnicodeString (&FullFileName, pwszMountVolume);
InitializeObjectAttributes (&oaFileAttributes, &FullFileName, OBJ_CASE_INSENSITIVE | (forceAccessCheck ? OBJ_FORCE_ACCESS_CHECK : 0) | OBJ_KERNEL_HANDLE, NULL, NULL);
KeInitializeEvent (&Extension->keVolumeEvent, NotificationEvent, FALSE);
if (Extension->SecurityClientContextValid)
{
ntStatus = SeImpersonateClientEx (&Extension->SecurityClientContext, NULL);
if (!NT_SUCCESS (ntStatus))
goto error;
}
mount->VolumeMountedReadOnlyAfterDeviceWriteProtected = FALSE;
// If we are opening a device, query its size first
if (bRawDevice)
{
PARTITION_INFORMATION pi;
PARTITION_INFORMATION_EX pix;
LARGE_INTEGER diskLengthInfo;
DISK_GEOMETRY dg;
ntStatus = IoGetDeviceObjectPointer (&FullFileName,
FILE_READ_DATA | FILE_READ_ATTRIBUTES,
&Extension->pfoDeviceFile,
&Extension->pFsdDevice);
if (!NT_SUCCESS (ntStatus))
goto error;
ntStatus = GSTSendHostDeviceIoControlRequest (DeviceObject, Extension, IOCTL_DISK_GET_DRIVE_GEOMETRY, (char *) &dg, sizeof (dg));
if (!NT_SUCCESS (ntStatus))
goto error;
lDiskLength.QuadPart = dg.Cylinders.QuadPart * dg.SectorsPerTrack * dg.TracksPerCylinder * dg.BytesPerSector;
Extension->HostBytesPerSector = dg.BytesPerSector;
// Drive geometry is used only when IOCTL_DISK_GET_PARTITION_INFO fails
if (NT_SUCCESS (GSTSendHostDeviceIoControlRequest (DeviceObject, Extension, IOCTL_DISK_GET_PARTITION_INFO_EX, (char *) &pix, sizeof (pix))))
{
lDiskLength.QuadPart = pix.PartitionLength.QuadPart;
partitionStartingOffset = pix.StartingOffset.QuadPart;
}
// Windows 2000 does not support IOCTL_DISK_GET_PARTITION_INFO_EX
else if (NT_SUCCESS (GSTSendHostDeviceIoControlRequest (DeviceObject, Extension, IOCTL_DISK_GET_PARTITION_INFO, (char *) &pi, sizeof (pi))))
{
lDiskLength.QuadPart = pi.PartitionLength.QuadPart;
partitionStartingOffset = pi.StartingOffset.QuadPart;
}
else if (NT_SUCCESS (GSTSendHostDeviceIoControlRequest (DeviceObject, Extension, IOCTL_DISK_GET_LENGTH_INFO, &diskLengthInfo, sizeof (diskLengthInfo))))
{
lDiskLength = diskLengthInfo;
}
ProbingHostDeviceForWrite = TRUE;
if (!mount->bMountReadOnly
&& GSTSendHostDeviceIoControlRequest (DeviceObject, Extension,
IsHiddenSystemRunning() ? GST_IOCTL_DISK_IS_WRITABLE : IOCTL_DISK_IS_WRITABLE, NULL, 0) == STATUS_MEDIA_WRITE_PROTECTED)
{
mount->bMountReadOnly = TRUE;
DeviceObject->Characteristics |= FILE_READ_ONLY_DEVICE;
mount->VolumeMountedReadOnlyAfterDeviceWriteProtected = TRUE;
}
ProbingHostDeviceForWrite = FALSE;
// Some Windows tools (e.g. diskmgmt, diskpart, vssadmin) fail or experience timeouts when there is a raw device
// open for exclusive access. Therefore, exclusive access is used only for file-hosted volumes.
// Applications requiring a consistent device image need to acquire exclusive write access first. This is prevented
// when a device-hosted volume is mounted.
exclusiveAccess = FALSE;
}
else
{
// Limit the maximum required buffer size
if (mount->BytesPerSector > 128 * BYTES_PER_KB)
{
ntStatus = STATUS_INVALID_PARAMETER;
goto error;
}
Extension->HostBytesPerSector = mount->BytesPerSector;
if (Extension->HostBytesPerSector != GST_SECTOR_SIZE_FILE_HOSTED_VOLUME)
disableBuffering = FALSE;
}
// Open the volume hosting file/device
if (!mount->bMountReadOnly)
{
ntStatus = ZwCreateFile (&Extension->hDeviceFile,
GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE,
&oaFileAttributes,
&IoStatusBlock,
NULL,
FILE_ATTRIBUTE_NORMAL |
FILE_ATTRIBUTE_SYSTEM,
exclusiveAccess ? 0 : FILE_SHARE_READ | FILE_SHARE_WRITE,
FILE_OPEN,
FILE_RANDOM_ACCESS |
FILE_WRITE_THROUGH |
(disableBuffering ? FILE_NO_INTERMEDIATE_BUFFERING : 0) |
FILE_SYNCHRONOUS_IO_NONALERT,
NULL,
0);
}
/* 26-4-99 NT for some partitions returns this code, it is really a access denied */
if (ntStatus == 0xc000001b)
ntStatus = STATUS_ACCESS_DENIED;
mount->VolumeMountedReadOnlyAfterAccessDenied = FALSE;
if (mount->bMountReadOnly || ntStatus == STATUS_ACCESS_DENIED)
{
ntStatus = ZwCreateFile (&Extension->hDeviceFile,
GENERIC_READ | SYNCHRONIZE,
&oaFileAttributes,
&IoStatusBlock,
NULL,
FILE_ATTRIBUTE_NORMAL |
FILE_ATTRIBUTE_SYSTEM,
exclusiveAccess ? FILE_SHARE_READ : FILE_SHARE_READ | FILE_SHARE_WRITE,
FILE_OPEN,
FILE_RANDOM_ACCESS |
FILE_WRITE_THROUGH |
(disableBuffering ? FILE_NO_INTERMEDIATE_BUFFERING : 0) |
FILE_SYNCHRONOUS_IO_NONALERT,
NULL,
0);
if (NT_SUCCESS (ntStatus) && !mount->bMountReadOnly)
mount->VolumeMountedReadOnlyAfterAccessDenied = TRUE;
Extension->bReadOnly = TRUE;
DeviceObject->Characteristics |= FILE_READ_ONLY_DEVICE;
}
else
Extension->bReadOnly = FALSE;
/* 26-4-99 NT for some partitions returns this code, it is really a
access denied */
if (ntStatus == 0xc000001b)
{
/* Partitions which return this code can still be opened with
FILE_SHARE_READ but this causes NT problems elsewhere in
particular if you do FILE_SHARE_READ NT will die later if
anyone even tries to open the partition (or file for that
matter...) */
ntStatus = STATUS_SHARING_VIOLATION;
}
if (!NT_SUCCESS (ntStatus))
{
goto error;
}
// If we have opened a file, query its size now
if (bRawDevice == FALSE)
{
ntStatus = ZwQueryInformationFile (Extension->hDeviceFile,
&IoStatusBlock,
&FileBasicInfo,
sizeof (FileBasicInfo),
FileBasicInformation);
if (NT_SUCCESS (ntStatus))
{
if (mount->bPreserveTimestamp)
{
Extension->fileCreationTime = FileBasicInfo.CreationTime;
Extension->fileLastAccessTime = FileBasicInfo.LastAccessTime;
Extension->fileLastWriteTime = FileBasicInfo.LastWriteTime;
Extension->fileLastChangeTime = FileBasicInfo.ChangeTime;
Extension->bTimeStampValid = TRUE;
}
ntStatus = ZwQueryInformationFile (Extension->hDeviceFile,
&IoStatusBlock,
&FileStandardInfo,
sizeof (FileStandardInfo),
FileStandardInformation);
}
if (!NT_SUCCESS (ntStatus))
{
Dump ("ZwQueryInformationFile failed while opening file: NTSTATUS 0x%08x\n",
ntStatus);
goto error;
}
lDiskLength.QuadPart = FileStandardInfo.EndOfFile.QuadPart;
if (FileBasicInfo.FileAttributes & FILE_ATTRIBUTE_COMPRESSED)
{
Dump ("File \"%ls\" is marked as compressed - not supported!\n", pwszMountVolume);
mount->nReturnCode = ERR_COMPRESSION_NOT_SUPPORTED;
ntStatus = STATUS_SUCCESS;
goto error;
}
ntStatus = ObReferenceObjectByHandle (Extension->hDeviceFile,
FILE_ALL_ACCESS,
*IoFileObjectType,
KernelMode,
&Extension->pfoDeviceFile,
0);
if (!NT_SUCCESS (ntStatus))
{
goto error;
}
/* Get the FSD device for the file (probably either NTFS or FAT) */
Extension->pFsdDevice = IoGetRelatedDeviceObject (Extension->pfoDeviceFile);
}
else
{
// Try to gain "raw" access to the partition in case there is a live filesystem on it (otherwise,
// the NTFS driver guards hidden sectors and prevents mounting using a backup header e.g. after the user
// accidentally quick-formats a dismounted partition-hosted GostCrypt volume as NTFS).
PFILE_OBJECT pfoTmpDeviceFile = NULL;
if (NT_SUCCESS (ObReferenceObjectByHandle (Extension->hDeviceFile, FILE_ALL_ACCESS, *IoFileObjectType, KernelMode, &pfoTmpDeviceFile, NULL))
&& pfoTmpDeviceFile != NULL)
{
GSTFsctlCall (pfoTmpDeviceFile, FSCTL_ALLOW_EXTENDED_DASD_IO, NULL, 0, NULL, 0);
ObDereferenceObject (pfoTmpDeviceFile);
}
}
// Check volume size
if (lDiskLength.QuadPart < GST_MIN_VOLUME_SIZE_LEGACY || lDiskLength.QuadPart > GST_MAX_VOLUME_SIZE)
{
mount->nReturnCode = ERR_VOL_SIZE_WRONG;
ntStatus = STATUS_SUCCESS;
goto error;
}
Extension->DiskLength = lDiskLength.QuadPart;
Extension->HostLength = lDiskLength.QuadPart;
readBuffer = GSTalloc (max (max (GST_VOLUME_HEADER_EFFECTIVE_SIZE, PAGE_SIZE), Extension->HostBytesPerSector));
if (readBuffer == NULL)
{
ntStatus = STATUS_INSUFFICIENT_RESOURCES;
goto error;
}
// Go through all volume types (e.g., normal, hidden)
for (volumeType = GST_VOLUME_TYPE_NORMAL;
volumeType < GST_VOLUME_TYPE_COUNT;
volumeType++)
{
Dump ("Trying to open volume type %d\n", volumeType);
if (mount->bPartitionInInactiveSysEncScope
&& volumeType == GST_VOLUME_TYPE_HIDDEN_LEGACY)
continue;
/* Read the volume header */
if (!mount->bPartitionInInactiveSysEncScope
|| (mount->bPartitionInInactiveSysEncScope && volumeType == GST_VOLUME_TYPE_HIDDEN))
{
// Header of a volume that is not within the scope of system encryption, or
// header of a system hidden volume (containing a hidden OS)
LARGE_INTEGER headerOffset;
if (mount->UseBackupHeader && lDiskLength.QuadPart <= GST_TOTAL_VOLUME_HEADERS_SIZE)
continue;
switch (volumeType)
{
case GST_VOLUME_TYPE_NORMAL:
headerOffset.QuadPart = mount->UseBackupHeader ? lDiskLength.QuadPart - GST_VOLUME_HEADER_GROUP_SIZE : GST_VOLUME_HEADER_OFFSET;
break;
case GST_VOLUME_TYPE_HIDDEN:
if (lDiskLength.QuadPart <= GST_VOLUME_HEADER_GROUP_SIZE)
continue;
headerOffset.QuadPart = mount->UseBackupHeader ? lDiskLength.QuadPart - GST_HIDDEN_VOLUME_HEADER_OFFSET : GST_HIDDEN_VOLUME_HEADER_OFFSET;
break;
case GST_VOLUME_TYPE_HIDDEN_LEGACY:
if (mount->UseBackupHeader)
continue;
if (bRawDevice && Extension->HostBytesPerSector != GST_SECTOR_SIZE_LEGACY)
continue;
headerOffset.QuadPart = lDiskLength.QuadPart - GST_HIDDEN_VOLUME_HEADER_OFFSET_LEGACY;
break;
}
Dump ("Reading volume header at %I64d\n", headerOffset.QuadPart);
ntStatus = ZwReadFile (Extension->hDeviceFile,
NULL,
NULL,
NULL,
&IoStatusBlock,
readBuffer,
bRawDevice ? max (GST_VOLUME_HEADER_EFFECTIVE_SIZE, Extension->HostBytesPerSector) : GST_VOLUME_HEADER_EFFECTIVE_SIZE,
&headerOffset,
NULL);
}
else
{
// Header of a partition that is within the scope of system encryption
WCHAR parentDrivePath [47+1] = {0};
HANDLE hParentDeviceFile = NULL;
UNICODE_STRING FullParentPath;
OBJECT_ATTRIBUTES oaParentFileAttributes;
LARGE_INTEGER parentKeyDataOffset;
_snwprintf (parentDrivePath,
sizeof (parentDrivePath) / sizeof (WCHAR) - 1,
WIDE ("\\Device\\Harddisk%d\\Partition0"),
mount->nPartitionInInactiveSysEncScopeDriveNo);
Dump ("Mounting partition within scope of system encryption (reading key data from: %ls)\n", parentDrivePath);
RtlInitUnicodeString (&FullParentPath, parentDrivePath);
InitializeObjectAttributes (&oaParentFileAttributes, &FullParentPath, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, NULL, NULL);
ntStatus = ZwCreateFile (&hParentDeviceFile,
GENERIC_READ | SYNCHRONIZE,
&oaParentFileAttributes,
&IoStatusBlock,
NULL,
FILE_ATTRIBUTE_NORMAL |
FILE_ATTRIBUTE_SYSTEM,
FILE_SHARE_READ | FILE_SHARE_WRITE,
FILE_OPEN,
FILE_RANDOM_ACCESS |
FILE_WRITE_THROUGH |
FILE_NO_INTERMEDIATE_BUFFERING |
FILE_SYNCHRONOUS_IO_NONALERT,
NULL,
0);
if (!NT_SUCCESS (ntStatus))
{
if (hParentDeviceFile != NULL)
ZwClose (hParentDeviceFile);
Dump ("Cannot open %ls\n", parentDrivePath);
goto error;
}
parentKeyDataOffset.QuadPart = GST_BOOT_VOLUME_HEADER_SECTOR_OFFSET;
ntStatus = ZwReadFile (hParentDeviceFile,
NULL,
NULL,
NULL,
&IoStatusBlock,
readBuffer,
max (GST_VOLUME_HEADER_EFFECTIVE_SIZE, Extension->HostBytesPerSector),
&parentKeyDataOffset,
NULL);
if (hParentDeviceFile != NULL)
ZwClose (hParentDeviceFile);
}
if (!NT_SUCCESS (ntStatus) && ntStatus != STATUS_END_OF_FILE)
{
Dump ("Read failed: NTSTATUS 0x%08x\n", ntStatus);
goto error;
}
if (ntStatus == STATUS_END_OF_FILE || IoStatusBlock.Information < GST_VOLUME_HEADER_EFFECTIVE_SIZE)
{
Dump ("Read didn't read enough data\n");
// If FSCTL_ALLOW_EXTENDED_DASD_IO failed and there is a live filesystem on the partition, then the
// filesystem driver may report EOF when we are reading hidden sectors (when the filesystem is
// shorter than the partition). This can happen for example after the user quick-formats a dismounted
// partition-hosted GostCrypt volume and then tries to mount the volume using the embedded backup header.
memset (readBuffer, 0, GST_VOLUME_HEADER_EFFECTIVE_SIZE);
}
/* Attempt to recognize the volume (decrypt the header) */
ReadVolumeHeaderRecoveryMode = mount->RecoveryMode;
if ((volumeType == GST_VOLUME_TYPE_HIDDEN || volumeType == GST_VOLUME_TYPE_HIDDEN_LEGACY) && mount->bProtectHiddenVolume)
{
mount->nReturnCode = ReadVolumeHeaderWCache (
FALSE,
mount->bCache,
readBuffer,
&mount->ProtectedHidVolPassword,
&tmpCryptoInfo);
}
else
{
mount->nReturnCode = ReadVolumeHeaderWCache (
mount->bPartitionInInactiveSysEncScope && volumeType == GST_VOLUME_TYPE_NORMAL,
mount->bCache,
readBuffer,
&mount->VolumePassword,
&Extension->cryptoInfo);
}
ReadVolumeHeaderRecoveryMode = FALSE;
if (mount->nReturnCode == 0 || mount->nReturnCode == ERR_CIPHER_INIT_WEAK_KEY)
{
/* Volume header successfully decrypted */
Dump ("Volume header decrypted\n");
Dump ("Required program version = %x\n", (int) Extension->cryptoInfo->RequiredProgramVersion);
Dump ("Legacy volume = %d\n", (int) Extension->cryptoInfo->LegacyVolume);
if (IsHiddenSystemRunning() && !Extension->cryptoInfo->hiddenVolume)
{
Extension->bReadOnly = mount->bMountReadOnly = TRUE;
HiddenSysLeakProtectionCount++;
}
Extension->cryptoInfo->bProtectHiddenVolume = FALSE;
Extension->cryptoInfo->bHiddenVolProtectionAction = FALSE;
Extension->cryptoInfo->bPartitionInInactiveSysEncScope = mount->bPartitionInInactiveSysEncScope;
if (volumeType == GST_VOLUME_TYPE_NORMAL)
{
if (mount->bPartitionInInactiveSysEncScope)
{
if (Extension->cryptoInfo->EncryptedAreaStart.Value > (unsigned __int64) partitionStartingOffset
|| Extension->cryptoInfo->EncryptedAreaStart.Value + Extension->cryptoInfo->VolumeSize.Value <= (unsigned __int64) partitionStartingOffset)
{
// The partition is not within the key scope of system encryption
mount->nReturnCode = ERR_PASSWORD_WRONG;
ntStatus = STATUS_SUCCESS;
goto error;
}
if (Extension->cryptoInfo->EncryptedAreaLength.Value != Extension->cryptoInfo->VolumeSize.Value)
{
// Partial encryption is not supported for volumes mounted as regular
mount->nReturnCode = ERR_ENCRYPTION_NOT_COMPLETED;
ntStatus = STATUS_SUCCESS;
goto error;
}
}
else if (Extension->cryptoInfo->HeaderFlags & GST_HEADER_FLAG_NONSYS_INPLACE_ENC)
{
if (Extension->cryptoInfo->EncryptedAreaLength.Value != Extension->cryptoInfo->VolumeSize.Value)
{
// Non-system in-place encryption process has not been completed on this volume
mount->nReturnCode = ERR_NONSYS_INPLACE_ENC_INCOMPLETE;
ntStatus = STATUS_SUCCESS;
goto error;
}
}
}
Extension->cryptoInfo->FirstDataUnitNo.Value = 0;
if (Extension->cryptoInfo->hiddenVolume && IsHiddenSystemRunning())
{
// Prevent mount of a hidden system partition if the system hosted on it is currently running
if (memcmp (Extension->cryptoInfo->master_keydata, GetSystemDriveCryptoInfo()->master_keydata, EAGetKeySize (Extension->cryptoInfo->ea)) == 0)
{
mount->nReturnCode = ERR_VOL_ALREADY_MOUNTED;
ntStatus = STATUS_SUCCESS;
goto error;
}
}
switch (volumeType)
{
case GST_VOLUME_TYPE_NORMAL:
Extension->cryptoInfo->hiddenVolume = FALSE;
if (mount->bPartitionInInactiveSysEncScope)
{
Extension->cryptoInfo->volDataAreaOffset = 0;
Extension->DiskLength = lDiskLength.QuadPart;
Extension->cryptoInfo->FirstDataUnitNo.Value = partitionStartingOffset / ENCRYPTION_DATA_UNIT_SIZE;
}
else if (Extension->cryptoInfo->LegacyVolume)
{
Extension->cryptoInfo->volDataAreaOffset = GST_VOLUME_HEADER_SIZE_LEGACY;
Extension->DiskLength = lDiskLength.QuadPart - GST_VOLUME_HEADER_SIZE_LEGACY;
}
else
{
Extension->cryptoInfo->volDataAreaOffset = Extension->cryptoInfo->EncryptedAreaStart.Value;
Extension->DiskLength = Extension->cryptoInfo->VolumeSize.Value;
}
break;
case GST_VOLUME_TYPE_HIDDEN:
case GST_VOLUME_TYPE_HIDDEN_LEGACY:
cryptoInfoPtr = mount->bProtectHiddenVolume ? tmpCryptoInfo : Extension->cryptoInfo;
if (volumeType == GST_VOLUME_TYPE_HIDDEN_LEGACY)
Extension->cryptoInfo->hiddenVolumeOffset = lDiskLength.QuadPart - cryptoInfoPtr->hiddenVolumeSize - GST_HIDDEN_VOLUME_HEADER_OFFSET_LEGACY;
else
Extension->cryptoInfo->hiddenVolumeOffset = cryptoInfoPtr->EncryptedAreaStart.Value;
Dump ("Hidden volume offset = %I64d\n", Extension->cryptoInfo->hiddenVolumeOffset);
Dump ("Hidden volume size = %I64d\n", cryptoInfoPtr->hiddenVolumeSize);
Dump ("Hidden volume end = %I64d\n", Extension->cryptoInfo->hiddenVolumeOffset + cryptoInfoPtr->hiddenVolumeSize - 1);
// Validate the offset
if (Extension->cryptoInfo->hiddenVolumeOffset % ENCRYPTION_DATA_UNIT_SIZE != 0)
{
mount->nReturnCode = ERR_VOL_SIZE_WRONG;
ntStatus = STATUS_SUCCESS;
goto error;
}
// If we are supposed to actually mount the hidden volume (not just to protect it)
if (!mount->bProtectHiddenVolume)
{
Extension->DiskLength = cryptoInfoPtr->hiddenVolumeSize;
Extension->cryptoInfo->hiddenVolume = TRUE;
Extension->cryptoInfo->volDataAreaOffset = Extension->cryptoInfo->hiddenVolumeOffset;
}
else
{
// Hidden volume protection
Extension->cryptoInfo->hiddenVolume = FALSE;
Extension->cryptoInfo->bProtectHiddenVolume = TRUE;
Extension->cryptoInfo->hiddenVolumeProtectedSize = tmpCryptoInfo->hiddenVolumeSize;
if (volumeType == GST_VOLUME_TYPE_HIDDEN_LEGACY)
Extension->cryptoInfo->hiddenVolumeProtectedSize += GST_VOLUME_HEADER_SIZE_LEGACY;
Dump ("Hidden volume protection active: %I64d-%I64d (%I64d)\n", Extension->cryptoInfo->hiddenVolumeOffset, Extension->cryptoInfo->hiddenVolumeProtectedSize + Extension->cryptoInfo->hiddenVolumeOffset - 1, Extension->cryptoInfo->hiddenVolumeProtectedSize);
}
break;
}
Dump ("Volume data offset = %I64d\n", Extension->cryptoInfo->volDataAreaOffset);
Dump ("Volume data size = %I64d\n", Extension->DiskLength);
Dump ("Volume data end = %I64d\n", Extension->cryptoInfo->volDataAreaOffset + Extension->DiskLength - 1);
if (Extension->DiskLength == 0)
{
Dump ("Incorrect volume size\n");
continue;
}
// If this is a hidden volume, make sure we are supposed to actually
// mount it (i.e. not just to protect it)
if (volumeType == GST_VOLUME_TYPE_NORMAL || !mount->bProtectHiddenVolume)
{
// Validate sector size
if (bRawDevice && Extension->cryptoInfo->SectorSize != Extension->HostBytesPerSector)
{
mount->nReturnCode = ERR_PARAMETER_INCORRECT;
ntStatus = STATUS_SUCCESS;
goto error;
}
// Calculate virtual volume geometry
Extension->TracksPerCylinder = 1;
Extension->SectorsPerTrack = 1;
Extension->BytesPerSector = Extension->cryptoInfo->SectorSize;
Extension->NumberOfCylinders = Extension->DiskLength / Extension->BytesPerSector;
Extension->PartitionType = 0;
Extension->bRawDevice = bRawDevice;
memset (Extension->wszVolume, 0, sizeof (Extension->wszVolume));
if (wcsstr (pwszMountVolume, WIDE ("\\??\\UNC\\")) == pwszMountVolume)
{
/* UNC path */
_snwprintf (Extension->wszVolume,
sizeof (Extension->wszVolume) / sizeof (WCHAR) - 1,
WIDE ("\\??\\\\%s"),
pwszMountVolume + 7);
}
else
{
wcsncpy (Extension->wszVolume, pwszMountVolume, sizeof (Extension->wszVolume) / sizeof (WCHAR) - 1);
}
}
// If we are to protect a hidden volume we cannot exit yet, for we must also
// decrypt the hidden volume header.
if (!(volumeType == GST_VOLUME_TYPE_NORMAL && mount->bProtectHiddenVolume))
{
GSTfree (readBuffer);
if (tmpCryptoInfo != NULL)
{
crypto_close (tmpCryptoInfo);
tmpCryptoInfo = NULL;
}
return STATUS_SUCCESS;
}
}
else if ((mount->bProtectHiddenVolume && volumeType == GST_VOLUME_TYPE_NORMAL)
|| mount->nReturnCode != ERR_PASSWORD_WRONG)
{
/* If we are not supposed to protect a hidden volume, the only error that is
tolerated is ERR_PASSWORD_WRONG (to allow mounting a possible hidden volume).
If we _are_ supposed to protect a hidden volume, we do not tolerate any error
(both volume headers must be successfully decrypted). */
break;
}
}
/* Failed due to some non-OS reason so we drop through and return NT
SUCCESS then nReturnCode is checked later in user-mode */
if (mount->nReturnCode == ERR_OUTOFMEMORY)
ntStatus = STATUS_INSUFFICIENT_RESOURCES;
else
ntStatus = STATUS_SUCCESS;
error:
if (mount->nReturnCode == ERR_SUCCESS)
mount->nReturnCode = ERR_PASSWORD_WRONG;
if (tmpCryptoInfo != NULL)
{
crypto_close (tmpCryptoInfo);
tmpCryptoInfo = NULL;
}
if (Extension->cryptoInfo)
{
crypto_close (Extension->cryptoInfo);
Extension->cryptoInfo = NULL;
}
if (Extension->bTimeStampValid)
{
RestoreTimeStamp (Extension);
}
/* Close the hDeviceFile */
if (Extension->hDeviceFile != NULL)
ZwClose (Extension->hDeviceFile);
/* The cryptoInfo pointer is deallocated if the readheader routines
fail so there is no need to deallocate here */
/* Dereference the user-mode file object */
if (Extension->pfoDeviceFile != NULL)
ObDereferenceObject (Extension->pfoDeviceFile);
/* Free the tmp IO buffers */
if (readBuffer != NULL)
GSTfree (readBuffer);
return ntStatus;
}