最后贴一段TCOpenVolume
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
Extension->pfoDeviceFile = NULL;
Extension->hDeviceFile = NULL;
Extension->bTimeStampValid = FALSE;
RtlInitUnicodeString (&FullFileName, pwszMountVolume);// 要挂载的设备名字
InitializeObjectAttributes (&oaFileAttributes, &FullFileName, OBJ_CASE_INSENSITIVE | (forceAccessCheck ? OBJ_FORCE_ACCESS_CHECK : 0), NULL, NULL);
KeInitializeEvent (&Extension->keVolumeEvent, NotificationEvent, FALSE); //初始化卷挂载事件
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); //要挂载设备的文件对象和设备栈的栈顶对象都放入新设备的设备扩展
if (!NT_SUCCESS (ntStatus))
goto error;
if (NT_SUCCESS (TCSendHostDeviceIoControlRequest (DeviceObject, Extension, IOCTL_DISK_GET_DRIVE_GEOMETRY, (char *) &dg, sizeof (dg))))
{
lDiskLength.QuadPart = dg.Cylinders.QuadPart * dg.SectorsPerTrack * dg.TracksPerCylinder * dg.BytesPerSector;
mount->BytesPerSector = dg.BytesPerSector;
}
else
lDiskLength.QuadPart = 0;
//发送控制码获得挂载设备的设备属性
// 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)))) //获得分区信息
{
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;
}
//先阻止上层给他发TC_IOCTL_DISK_IS_WRITABLE，发TC_IOCTL_DISK_IS_WRITABLE询问这个要挂载的设备是不是可读写的，如不是，生成的虚拟设备也是相同属性
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;
}
if (mount->BytesPerSector == 0)
mount->BytesPerSector = SECTOR_SIZE;
Extension->HostBytesPerSector = mount->BytesPerSector; //挂载设备的扇区大小保持在新设备的设备扩展
// 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,
mount->bExclusiveAccess ? 0 : FILE_SHARE_READ | FILE_SHARE_WRITE,
FILE_OPEN,
FILE_RANDOM_ACCESS |
FILE_WRITE_THROUGH |
(Extension->HostBytesPerSector == SECTOR_SIZE ? 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,
mount->bExclusiveAccess ? FILE_SHARE_READ : FILE_SHARE_READ | FILE_SHARE_WRITE,
FILE_OPEN,
FILE_RANDOM_ACCESS |
FILE_WRITE_THROUGH |
(Extension->HostBytesPerSector == SECTOR_SIZE ? 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); //这里很重要通知文件系统不做边界检查
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 (TC_VOLUME_HEADER_EFFECTIVE_SIZE, PAGE_SIZE));
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);
if (mount->bPartitionInInactiveSysEncScope
&& volumeType == TC_VOLUME_TYPE_HIDDEN_LEGACY)
continue;
/* 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;
case TC_VOLUME_TYPE_HIDDEN_LEGACY:
if (mount->UseBackupHeader)
continue;
headerOffset.QuadPart = lDiskLength.QuadPart - TC_HIDDEN_VOLUME_HEADER_OFFSET_LEGACY;
break;
}
Dump ("Reading volume header at %I64d\n", headerOffset.QuadPart);
//读取卷的头
ntStatus = ZwReadFile (Extension->hDeviceFile,
NULL,
NULL,
NULL,
&IoStatusBlock,
readBuffer,
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;
_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, 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 |
(Extension->HostBytesPerSector == SECTOR_SIZE ? FILE_NO_INTERMEDIATE_BUFFERING : 0) |
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,
TC_VOLUME_HEADER_EFFECTIVE_SIZE,
&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 || volumeType == TC_VOLUME_TYPE_HIDDEN_LEGACY) && mount->bProtectHiddenVolume)
{
mount->nReturnCode = ReadVolumeHeaderWCache (
FALSE,
mount->bCache,
readBuffer,
&mount->ProtectedHidVolPassword,
&tmpCryptoInfo);
}
else
{
mount->nReturnCode = ReadVolumeHeaderWCache (
mount->bPartitionInInactiveSysEncScope && volumeType == TC_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 == 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:
case TC_VOLUME_TYPE_HIDDEN_LEGACY:
cryptoInfoPtr = mount->bProtectHiddenVolume ? tmpCryptoInfo : Extension->cryptoInfo;
if (volumeType == TC_VOLUME_TYPE_HIDDEN_LEGACY)
Extension->cryptoInfo->hiddenVolumeOffset = lDiskLength.QuadPart - cryptoInfoPtr->hiddenVolumeSize - TC_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 == TC_VOLUME_TYPE_HIDDEN_LEGACY)
Extension->cryptoInfo->hiddenVolumeProtectedSize += TC_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 == TC_VOLUME_TYPE_NORMAL || !mount->bProtectHiddenVolume)
{
// Calculate virtual volume geometry
Extension->TracksPerCylinder = 1;
Extension->SectorsPerTrack = 1;
Extension->BytesPerSector = SECTOR_SIZE;
Extension->NumberOfCylinders = Extension->DiskLength / SECTOR_SIZE;
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 == 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;
}
贴了不少代码，我在虚拟机上加密了D盘，然后跟了下，随便写了写，加密非系统分区还是用的虚拟磁盘的机制，比起filedisk亮点太多了，特别是多线程的处理上很值得学习
