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0e2c129854ac0e57cb8970c9145ae689bc4c7714
VeraCrypt/src/Driver/Ntvol.c
Mounir IDRASSI 0e2c129854 Windows Driver: enhance detection of FAT volumes.
2017-05-28 00:04:29 +02:00

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/*
Legal Notice: Some portions of the source code contained in this file were
derived from the source code of TrueCrypt 7.1a, which is
Copyright (c) 2003-2012 TrueCrypt Developers Association and which is
governed by the TrueCrypt License 3.0, also from the source code of
Encryption for the Masses 2.02a, which is Copyright (c) 1998-2000 Paul Le Roux
and which is governed by the 'License Agreement for Encryption for the Masses'
Modifications and additions to the original source code (contained in this file)
and all other portions of this file are Copyright (c) 2013-2016 IDRIX
and are governed by the Apache License 2.0 the full text of which is
contained in the file License.txt included in VeraCrypt binary and source
code distribution packages. */
#include "TCdefs.h"
#include <wchar.h>
#include "Crypto.h"
#include "Volumes.h"
#include "Apidrvr.h"
#include "DriveFilter.h"
#include "Ntdriver.h"
#include "Ntvol.h"
#include "VolumeFilter.h"
#include "Boot/Windows/BootCommon.h"
#include "Cache.h"
#if 0 && _DEBUG
#define EXTRA_INFO 1
#endif
#pragma warning( disable : 4127 )
#include <Ntstrsafe.h>
volatile BOOL ProbingHostDeviceForWrite = FALSE;
NTSTATUS TCOpenVolume (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;
/* default value for storage alignment */
Extension->HostMaximumTransferLength = 65536;
Extension->HostMaximumPhysicalPages = 17;
Extension->HostAlignmentMask = 0;
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_EX dg;
STORAGE_PROPERTY_QUERY storagePropertyQuery = {0};
STORAGE_DESCRIPTOR_HEADER storageHeader = {0};
ntStatus = IoGetDeviceObjectPointer (&FullFileName,
FILE_READ_DATA | FILE_READ_ATTRIBUTES,
&Extension->pfoDeviceFile,
&Extension->pFsdDevice);
if (!NT_SUCCESS (ntStatus))
goto error;
ntStatus = TCSendHostDeviceIoControlRequest (DeviceObject, Extension, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX, (char *) &dg, sizeof (dg));
if (!NT_SUCCESS (ntStatus))
goto error;
lDiskLength.QuadPart = dg.DiskSize.QuadPart;
Extension->HostBytesPerSector = dg.Geometry.BytesPerSector;
Extension->HostBytesPerPhysicalSector = dg.Geometry.BytesPerSector;
/* IOCTL_STORAGE_QUERY_PROPERTY supported only on Vista and above */
if (OsMajorVersion >= 6)
{
storagePropertyQuery.PropertyId = StorageAccessAlignmentProperty;
storagePropertyQuery.QueryType = PropertyStandardQuery;
if (NT_SUCCESS (TCSendHostDeviceIoControlRequestEx (DeviceObject, Extension, IOCTL_STORAGE_QUERY_PROPERTY,
(char*) &storagePropertyQuery, sizeof(storagePropertyQuery),
(char *) &storageHeader, sizeof (storageHeader))))
{
byte* outputBuffer = TCalloc (storageHeader.Size);
if (!outputBuffer)
{
ntStatus = STATUS_INSUFFICIENT_RESOURCES;
goto error;
}
if (NT_SUCCESS (TCSendHostDeviceIoControlRequestEx (DeviceObject, Extension, IOCTL_STORAGE_QUERY_PROPERTY,
(char*) &storagePropertyQuery, sizeof(storagePropertyQuery),
outputBuffer, storageHeader.Size)))
{
PSTORAGE_ACCESS_ALIGNMENT_DESCRIPTOR pStorageDescriptor = (PSTORAGE_ACCESS_ALIGNMENT_DESCRIPTOR) outputBuffer;
Extension->HostBytesPerPhysicalSector = pStorageDescriptor->BytesPerPhysicalSector;
}
TCfree (outputBuffer);
}
storagePropertyQuery.PropertyId = StorageAdapterProperty;
if (NT_SUCCESS (TCSendHostDeviceIoControlRequestEx (DeviceObject, Extension, IOCTL_STORAGE_QUERY_PROPERTY,
(char*) &storagePropertyQuery, sizeof(storagePropertyQuery),
(char *) &storageHeader, sizeof (storageHeader))))
{
byte* outputBuffer = TCalloc (storageHeader.Size);
if (!outputBuffer)
{
ntStatus = STATUS_INSUFFICIENT_RESOURCES;
goto error;
}
if (NT_SUCCESS (TCSendHostDeviceIoControlRequestEx (DeviceObject, Extension, IOCTL_STORAGE_QUERY_PROPERTY,
(char*) &storagePropertyQuery, sizeof(storagePropertyQuery),
outputBuffer, storageHeader.Size)))
{
PSTORAGE_ADAPTER_DESCRIPTOR pStorageDescriptor = (PSTORAGE_ADAPTER_DESCRIPTOR) outputBuffer;
Extension->HostMaximumTransferLength = pStorageDescriptor->MaximumTransferLength;
Extension->HostMaximumPhysicalPages = pStorageDescriptor->MaximumPhysicalPages;
Extension->HostAlignmentMask = pStorageDescriptor->AlignmentMask;
}
TCfree (outputBuffer);
}
}
// Drive geometry is used only when IOCTL_DISK_GET_PARTITION_INFO fails
if (NT_SUCCESS (TCSendHostDeviceIoControlRequest (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 (TCSendHostDeviceIoControlRequest (DeviceObject, Extension, IOCTL_DISK_GET_PARTITION_INFO, (char *) &pi, sizeof (pi))))
{
lDiskLength.QuadPart = pi.PartitionLength.QuadPart;
partitionStartingOffset = pi.StartingOffset.QuadPart;
}
else if (NT_SUCCESS (TCSendHostDeviceIoControlRequest (DeviceObject, Extension, IOCTL_DISK_GET_LENGTH_INFO, &diskLengthInfo, sizeof (diskLengthInfo))))
{
lDiskLength = diskLengthInfo;
}
ProbingHostDeviceForWrite = TRUE;
if (!mount->bMountReadOnly
&& TCSendHostDeviceIoControlRequest (DeviceObject, Extension,
IsHiddenSystemRunning() ? TC_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;
Extension->HostBytesPerPhysicalSector = mount->BytesPerPhysicalSector;
Extension->HostMaximumTransferLength = mount->MaximumTransferLength;
Extension->HostMaximumPhysicalPages = mount->MaximumPhysicalPages;
Extension->HostAlignmentMask = mount->AlignmentMask;
if (Extension->HostBytesPerSector != TC_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 TrueCrypt volume as NTFS).
PFILE_OBJECT pfoTmpDeviceFile = NULL;
if (NT_SUCCESS (ObReferenceObjectByHandle (Extension->hDeviceFile, FILE_ALL_ACCESS, *IoFileObjectType, KernelMode, &pfoTmpDeviceFile, NULL))
&& pfoTmpDeviceFile != NULL)
{
TCFsctlCall (pfoTmpDeviceFile, FSCTL_ALLOW_EXTENDED_DASD_IO, NULL, 0, NULL, 0);
ObDereferenceObject (pfoTmpDeviceFile);
}
}
// Check volume size
if (lDiskLength.QuadPart < TC_MIN_VOLUME_SIZE_LEGACY || lDiskLength.QuadPart > TC_MAX_VOLUME_SIZE)
{
mount->nReturnCode = ERR_VOL_SIZE_WRONG;
ntStatus = STATUS_SUCCESS;
goto error;
}
Extension->DiskLength = lDiskLength.QuadPart;
Extension->HostLength = lDiskLength.QuadPart;
readBuffer = TCalloc (max (max (TC_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 = TC_VOLUME_TYPE_NORMAL;
volumeType < TC_VOLUME_TYPE_COUNT;
volumeType++)
{
Dump ("Trying to open volume type %d\n", volumeType);
/* Read the volume header */
if (!mount->bPartitionInInactiveSysEncScope
|| (mount->bPartitionInInactiveSysEncScope && volumeType == TC_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 <= TC_TOTAL_VOLUME_HEADERS_SIZE)
continue;
switch (volumeType)
{
case TC_VOLUME_TYPE_NORMAL:
headerOffset.QuadPart = mount->UseBackupHeader ? lDiskLength.QuadPart - TC_VOLUME_HEADER_GROUP_SIZE : TC_VOLUME_HEADER_OFFSET;
break;
case TC_VOLUME_TYPE_HIDDEN:
if (lDiskLength.QuadPart <= TC_VOLUME_HEADER_GROUP_SIZE)
continue;
headerOffset.QuadPart = mount->UseBackupHeader ? lDiskLength.QuadPart - TC_HIDDEN_VOLUME_HEADER_OFFSET : TC_HIDDEN_VOLUME_HEADER_OFFSET;
break;
}
Dump ("Reading volume header at %I64d\n", headerOffset.QuadPart);
ntStatus = ZwReadFile (Extension->hDeviceFile,
NULL,
NULL,
NULL,
&IoStatusBlock,
readBuffer,
bRawDevice ? max (TC_VOLUME_HEADER_EFFECTIVE_SIZE, Extension->HostBytesPerSector) : TC_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;
RtlStringCbPrintfW (parentDrivePath,
sizeof (parentDrivePath),
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 = TC_BOOT_VOLUME_HEADER_SECTOR_OFFSET;
ntStatus = ZwReadFile (hParentDeviceFile,
NULL,
NULL,
NULL,
&IoStatusBlock,
readBuffer,
max (TC_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 < TC_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 TrueCrypt volume and then tries to mount the volume using the embedded backup header.
memset (readBuffer, 0, TC_VOLUME_HEADER_EFFECTIVE_SIZE);
}
/* Attempt to recognize the volume (decrypt the header) */
ReadVolumeHeaderRecoveryMode = mount->RecoveryMode;
if ((volumeType == TC_VOLUME_TYPE_HIDDEN) && mount->bProtectHiddenVolume)
{
mount->nReturnCode = ReadVolumeHeaderWCache (
FALSE,
mount->bCache,
mount->bCachePim,
readBuffer,
&mount->ProtectedHidVolPassword,
mount->ProtectedHidVolPkcs5Prf,
mount->ProtectedHidVolPim,
mount->bTrueCryptMode,
&tmpCryptoInfo);
}
else
{
mount->nReturnCode = ReadVolumeHeaderWCache (
mount->bPartitionInInactiveSysEncScope && volumeType == TC_VOLUME_TYPE_NORMAL,
mount->bCache,
mount->bCachePim,
readBuffer,
&mount->VolumePassword,
mount->pkcs5_prf,
mount->VolumePim,
mount->bTrueCryptMode,
&Extension->cryptoInfo);
}
ReadVolumeHeaderRecoveryMode = FALSE;
if (mount->nReturnCode == 0 || mount->nReturnCode == ERR_CIPHER_INIT_WEAK_KEY)
{
/* Volume header successfully decrypted */
if (!Extension->cryptoInfo)
{
/* should never happen */
mount->nReturnCode = ERR_OUTOFMEMORY;
ntStatus = STATUS_SUCCESS;
goto error;
}
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;
/* compute the ID of this volume: SHA-256 of the effective header */
sha256 (Extension->volumeID, readBuffer, TC_VOLUME_HEADER_EFFECTIVE_SIZE);
if (volumeType == TC_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 & TC_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 TC_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 = TC_VOLUME_HEADER_SIZE_LEGACY;
Extension->DiskLength = lDiskLength.QuadPart - TC_VOLUME_HEADER_SIZE_LEGACY;
}
else
{
Extension->cryptoInfo->volDataAreaOffset = Extension->cryptoInfo->EncryptedAreaStart.Value;
Extension->DiskLength = Extension->cryptoInfo->VolumeSize.Value;
}
break;
case TC_VOLUME_TYPE_HIDDEN:
cryptoInfoPtr = mount->bProtectHiddenVolume ? tmpCryptoInfo : Extension->cryptoInfo;
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;
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 == TC_VOLUME_TYPE_NORMAL || !mount->bProtectHiddenVolume)
{
LARGE_INTEGER dataOffset;
ULONG dataLength;
// 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;
// Add extra sector since our virtual partition starts at Extension->BytesPerSector and not 0
Extension->NumberOfCylinders = (Extension->DiskLength / Extension->BytesPerSector) + 1;
Extension->PartitionType = 0;
// Try to detect the filesystem used by the volume in order to give a correct value to Extension->PartitionType
dataOffset.QuadPart = (LONGLONG) Extension->cryptoInfo->volDataAreaOffset;
dataLength = bRawDevice ? Extension->HostBytesPerSector : TC_VOLUME_HEADER_EFFECTIVE_SIZE;
Dump ("Reading first data at %I64d\n", dataOffset.QuadPart);
if (NT_SUCCESS (ZwReadFile (Extension->hDeviceFile,
NULL,
NULL,
NULL,
&IoStatusBlock,
readBuffer,
dataLength,
&dataOffset,
NULL)))
{
uint64 fsId = 0;
UINT64_STRUCT dataUnit;
dataUnit.Value = Extension->cryptoInfo->volDataAreaOffset / ENCRYPTION_DATA_UNIT_SIZE;
if (Extension->cryptoInfo->bPartitionInInactiveSysEncScope)
dataUnit.Value += Extension->cryptoInfo->FirstDataUnitNo.Value;
DecryptDataUnits ((unsigned char*) readBuffer, &dataUnit, dataLength / ENCRYPTION_DATA_UNIT_SIZE, Extension->cryptoInfo);
fsId = BE64 (*(uint64 *) readBuffer);
switch (fsId)
{
case 0xEB3C904D53444F53: // FAT16/FAT12
case 0xEB3C906D6B66732E: // mkfs.fat
case 0xEB3C906D6B646F73: // mkfs.vfat/mkdosfs
// workaround for FAT32 formatting by TrueCrypt/VeraCrypt
if (memcmp (readBuffer + 0x52, "FAT32 ", 8) == 0)
{
Extension->PartitionType = PARTITION_FAT32;
Dump ("FAT32 detected with FAT16 header\n");
}
else
{
if (memcmp (readBuffer + 0x36, "FAT12 ", 8) == 0)
{
Extension->PartitionType = PARTITION_FAT_12;
Dump ("FAT12 detected\n");
}
else
{
Extension->PartitionType = PARTITION_FAT_16;
Dump ("FAT16 detected\n");
}
}
break;
case 0xEB58906D6B66732E: // mkfs.fat
case 0xEB58906D6B646F73: // mkfs.vfat/mkdosfs
case 0xEB58904D53444F53: // FAT32
Extension->PartitionType = PARTITION_FAT32;
Dump ("FAT32 detected\n");
break;
case 0xEB52904E54465320: // NTFS
Extension->PartitionType = PARTITION_IFS;
Dump ("NTFS detected\n");
break;
case 0xEB76904558464154: // exFAT
Extension->PartitionType = PARTITION_IFS;
Dump ("exFAT detected\n");
break;
case 0x0000005265465300: // ReFS
Extension->PartitionType = PARTITION_IFS;
Dump ("ReFS detected\n");
break;
default:
Dump ("Unknown FS ID (0x%.8I64x)\n", fsId);
break;
}
// erase sensitive data
EncryptDataUnits ((unsigned char*) readBuffer, &dataUnit, dataLength / ENCRYPTION_DATA_UNIT_SIZE, Extension->cryptoInfo);
burn (readBuffer, dataLength);
}
Extension->bRawDevice = bRawDevice;
memset (Extension->wszVolume, 0, sizeof (Extension->wszVolume));
if (wcsstr (pwszMountVolume, WIDE ("\\??\\UNC\\")) == pwszMountVolume)
{
/* UNC path */
RtlStringCbPrintfW (Extension->wszVolume,
sizeof (Extension->wszVolume),
WIDE ("\\??\\\\%s"),
pwszMountVolume + 7);
}
else
{
RtlStringCbCopyW (Extension->wszVolume, sizeof(Extension->wszVolume),pwszMountVolume);
}
memset (Extension->wszLabel, 0, sizeof (Extension->wszLabel));
RtlStringCbCopyW (Extension->wszLabel, sizeof(Extension->wszLabel), mount->wszLabel);
}
// If we are to protect a hidden volume we cannot exit yet, for we must also
// decrypt the hidden volume header.
if (!(volumeType == TC_VOLUME_TYPE_NORMAL && mount->bProtectHiddenVolume))
{
TCfree (readBuffer);
if (tmpCryptoInfo != NULL)
{
crypto_close (tmpCryptoInfo);
tmpCryptoInfo = NULL;
}
return STATUS_SUCCESS;
}
}
else if ((mount->bProtectHiddenVolume && volumeType == TC_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)
TCfree (readBuffer);
return ntStatus;
}
void TCCloseVolume (PDEVICE_OBJECT DeviceObject, PEXTENSION Extension)
{
UNREFERENCED_PARAMETER (DeviceObject); /* Remove compiler warning */
if (Extension->hDeviceFile != NULL)
{
if (Extension->bRawDevice == FALSE
&& Extension->bTimeStampValid)
{
RestoreTimeStamp (Extension);
}
ZwClose (Extension->hDeviceFile);
}
ObDereferenceObject (Extension->pfoDeviceFile);
if (Extension->cryptoInfo)
{
crypto_close (Extension->cryptoInfo);
Extension->cryptoInfo = NULL;
}
}
NTSTATUS TCSendHostDeviceIoControlRequestEx (PDEVICE_OBJECT DeviceObject,
PEXTENSION Extension,
ULONG IoControlCode,
void *InputBuffer,
ULONG InputBufferSize,
void *OutputBuffer,
ULONG OutputBufferSize)
{
IO_STATUS_BLOCK IoStatusBlock;
NTSTATUS ntStatus;
PIRP Irp;
UNREFERENCED_PARAMETER(DeviceObject); /* Remove compiler warning */
KeClearEvent (&Extension->keVolumeEvent);
Irp = IoBuildDeviceIoControlRequest (IoControlCode,
Extension->pFsdDevice,
InputBuffer, InputBufferSize,
OutputBuffer, OutputBufferSize,
FALSE,
&Extension->keVolumeEvent,
&IoStatusBlock);
if (Irp == NULL)
{
Dump ("IRP allocation failed\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
// Disk device may be used by filesystem driver which needs file object
IoGetNextIrpStackLocation (Irp) -> FileObject = Extension->pfoDeviceFile;
ntStatus = IoCallDriver (Extension->pFsdDevice, Irp);
if (ntStatus == STATUS_PENDING)
{
KeWaitForSingleObject (&Extension->keVolumeEvent, Executive, KernelMode, FALSE, NULL);
ntStatus = IoStatusBlock.Status;
}
return ntStatus;
}
NTSTATUS TCSendHostDeviceIoControlRequest (PDEVICE_OBJECT DeviceObject,
PEXTENSION Extension,
ULONG IoControlCode,
void *OutputBuffer,
ULONG OutputBufferSize)
{
return TCSendHostDeviceIoControlRequestEx (DeviceObject, Extension, IoControlCode, NULL, 0, OutputBuffer, OutputBufferSize);
}
NTSTATUS COMPLETE_IRP (PDEVICE_OBJECT DeviceObject,
PIRP Irp,
NTSTATUS IrpStatus,
ULONG_PTR IrpInformation)
{
Irp->IoStatus.Status = IrpStatus;
Irp->IoStatus.Information = IrpInformation;
UNREFERENCED_PARAMETER (DeviceObject); /* Remove compiler warning */
#if EXTRA_INFO
if (!NT_SUCCESS (IrpStatus))
{
PIO_STACK_LOCATION irpSp = IoGetCurrentIrpStackLocation (Irp);
Dump ("COMPLETE_IRP FAILING IRP %ls Flags 0x%08x vpb 0x%08x NTSTATUS 0x%08x\n", TCTranslateCode (irpSp->MajorFunction),
(ULONG) DeviceObject->Flags, (ULONG) DeviceObject->Vpb->Flags, IrpStatus);
}
else
{
PIO_STACK_LOCATION irpSp = IoGetCurrentIrpStackLocation (Irp);
Dump ("COMPLETE_IRP SUCCESS IRP %ls Flags 0x%08x vpb 0x%08x NTSTATUS 0x%08x\n", TCTranslateCode (irpSp->MajorFunction),
(ULONG) DeviceObject->Flags, (ULONG) DeviceObject->Vpb->Flags, IrpStatus);
}
#endif
IoCompleteRequest (Irp, IO_NO_INCREMENT);
return IrpStatus;
}
static void RestoreTimeStamp (PEXTENSION Extension)
{
NTSTATUS ntStatus;
FILE_BASIC_INFORMATION FileBasicInfo;
IO_STATUS_BLOCK IoStatusBlock;
if (Extension->hDeviceFile != NULL
&& Extension->bRawDevice == FALSE
&& Extension->bReadOnly == FALSE
&& Extension->bTimeStampValid)
{
ntStatus = ZwQueryInformationFile (Extension->hDeviceFile,
&IoStatusBlock,
&FileBasicInfo,
sizeof (FileBasicInfo),
FileBasicInformation);
if (!NT_SUCCESS (ntStatus))
{
Dump ("ZwQueryInformationFile failed in RestoreTimeStamp: NTSTATUS 0x%08x\n",
ntStatus);
}
else
{
FileBasicInfo.CreationTime = Extension->fileCreationTime;
FileBasicInfo.LastAccessTime = Extension->fileLastAccessTime;
FileBasicInfo.LastWriteTime = Extension->fileLastWriteTime;
FileBasicInfo.ChangeTime = Extension->fileLastChangeTime;
ntStatus = ZwSetInformationFile(
Extension->hDeviceFile,
&IoStatusBlock,
&FileBasicInfo,
sizeof (FileBasicInfo),
FileBasicInformation);
if (!NT_SUCCESS (ntStatus))
Dump ("ZwSetInformationFile failed in RestoreTimeStamp: NTSTATUS 0x%08x\n",ntStatus);
}
}
}
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