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TokenManager.pas
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TokenManager.pas
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unit TokenManager;
interface
uses
System.SysUtils,
System.NetEncoding,
System.IniFiles,
Windows;
type
TTokenManager = class
private type
TNCryptDescriptorHandle = Pointer;
TNCryptBuffer = record
cbBuffer: DWORD;
BufferType: DWORD;
pvBuffer: PVOID;
end;
PNCryptBuffer = ^TNCryptBuffer;
TNCryptBufferDesc = record
ulVersion: DWORD;
cBuffers: DWORD;
pBuffers: PNCryptBuffer;
end;
PNCryptBufferDesc = ^TNCryptBufferDesc;
PPBYTE = ^PBYTE;
private
hNCrypt: HMODULE;
FIniFile: TIniFile;
NCryptCreateProtectionDescriptor: function(
pszDescriptorString: LPCWSTR;
dwFlags: DWORD;
phDescriptor: PPointer
): HRESULT; stdcall;
NCryptProtectSecret: function(
hDescriptor: TNCryptDescriptorHandle;
dwFlags: DWORD;
pbData: PBYTE;
cbData: DWORD;
pMemPara: PNCryptBufferDesc;
hWnd: HWND;
ppbProtectedBlob: PPBYTE;
pcbProtectedBlob: PDWORD
): HRESULT; stdcall;
NCryptUnprotectSecret: function(
hDescriptor: TNCryptDescriptorHandle;
dwFlags: DWORD;
pbProtectedBlob: PBYTE;
cbProtectedBlob: DWORD;
pMemPara: PNCryptBufferDesc;
hWnd: HWND;
ppbData: PPBYTE;
pcbData: PDWORD
): HRESULT; stdcall;
NCryptCloseProtectionDescriptor: function(
hDescriptor: TNCryptDescriptorHandle
): HRESULT; stdcall;
public
constructor Create(const IniFileName: string);
destructor Destroy; override;
function ProtectSecret(const Secret: string): string;
function UnprotectSecret(const ProtectedBlob: string): string;
function RetrieveDecryptedToken(inSection, inName: string): string;
procedure StoreEncryptedToken(const inSection: string; const inName: string; const Token: string);
// procedure StoreExtraData(const Name, Value: string);
procedure StoreExtraSectionData(section: string; const Name, Value: string);
// function RetrieveExtraData(const name: string): string;
function RetrieveExtraSectionData(const section: string; const name: string): string;
end;
implementation
const
NCRYPT_PROTECT_SECRET_VERSION = 1;
function SecureZeroMemory(_ptr: Pointer; cnt: Longint): Pointer;
begin
FillChar(_ptr^, cnt, 0);
Result := _ptr;
end;
constructor TTokenManager.Create(const IniFileName: string);
begin
inherited Create;
FIniFile := TIniFile.Create(IniFileName);
hNCrypt := LoadLibrary('NCrypt.dll');
if hNCrypt <> 0 then
begin
@NCryptCreateProtectionDescriptor := GetProcAddress(hNCrypt, 'NCryptCreateProtectionDescriptor');
@NCryptProtectSecret := GetProcAddress(hNCrypt, 'NCryptProtectSecret');
@NCryptUnprotectSecret := GetProcAddress(hNCrypt, 'NCryptUnprotectSecret');
@NCryptCloseProtectionDescriptor := GetProcAddress(hNCrypt, 'NCryptCloseProtectionDescriptor');
if not Assigned(NCryptCreateProtectionDescriptor) or
not Assigned(NCryptProtectSecret) or
not Assigned(NCryptUnprotectSecret) or
not Assigned(NCryptCloseProtectionDescriptor) then
raise Exception.Create('Failed to load one or more NCrypt functions');
end
else
raise Exception.Create('Failed to load NCrypt.dll');
end;
destructor TTokenManager.Destroy;
begin
FIniFile.Free;
if hNCrypt <> 0 then
FreeLibrary(hNCrypt);
inherited Destroy;
end;
function TTokenManager.ProtectSecret(const Secret: string): string;
var
hDescriptor: TNCryptDescriptorHandle;
ProtectedBlob: PBYTE;
ProtectedBlobSize: DWORD;
ResultCode: HRESULT;
EncryptedBytes: TBytes;
begin
if not Assigned(NCryptCreateProtectionDescriptor) or not Assigned(NCryptProtectSecret) then
raise Exception.Create('NCrypt functions not assigned');
// Create the protection descriptor
ResultCode := NCryptCreateProtectionDescriptor('LOCAL=user', 0, @hDescriptor);
if ResultCode <> S_OK then
RaiseLastOSError(ResultCode);
try
ResultCode := NCryptProtectSecret(
hDescriptor,
0,
PBYTE(Secret),
Length(Secret) * SizeOf(Char), // Length in bytes
nil,
0,
@ProtectedBlob,
@ProtectedBlobSize
);
if ResultCode = S_OK then
begin
SetLength(EncryptedBytes, ProtectedBlobSize);
Move(ProtectedBlob^, EncryptedBytes[0], ProtectedBlobSize);
Result := TNetEncoding.Base64String.EncodeBytesToString(EncryptedBytes);
LocalFree(HLOCAL(ProtectedBlob));
end
else
RaiseLastOSError(ResultCode);
finally
// Close the protection descriptor
NCryptCloseProtectionDescriptor(hDescriptor);
end;
end;
function TTokenManager.UnprotectSecret(const ProtectedBlob: string): string;
var
hDescriptor: TNCryptDescriptorHandle;
Data: PBYTE;
DataSize: DWORD;
ResultCode: HRESULT;
EncryptedBytes: TBytes;
begin
if not Assigned(NCryptCreateProtectionDescriptor) or not Assigned(NCryptUnprotectSecret) then
raise Exception.Create('NCrypt functions not assigned');
// Create the protection descriptor
ResultCode := NCryptCreateProtectionDescriptor('LOCAL=user', 0, @hDescriptor);
if ResultCode <> S_OK then
RaiseLastOSError(ResultCode);
try
EncryptedBytes := TNetEncoding.Base64String.DecodeStringToBytes(ProtectedBlob);
ResultCode := NCryptUnprotectSecret(
hDescriptor,
0,
@EncryptedBytes[0],
Length(EncryptedBytes),
nil,
0,
@Data,
@DataSize
);
if ResultCode = S_OK then
begin
SetLength(Result, DataSize div SizeOf(Char)); // Adjust length for character size
Move(Data^, PChar(Result)^, DataSize);
SecureZeroMemory(Data, DataSize);
LocalFree(HLOCAL(Data));
end
else
RaiseLastOSError(ResultCode);
finally
// Close the protection descriptor
NCryptCloseProtectionDescriptor(hDescriptor);
end;
end;
function TTokenManager.RetrieveDecryptedToken(inSection: string; inName: string): string;
var
EncryptedToken: string;
begin
EncryptedToken := FIniFile.ReadString(inSection, inName, '');
if EncryptedToken = '' then
begin
Result := '';
Exit;
end;
Result := UnprotectSecret(EncryptedToken);
end;
//function TTokenManager.RetrieveExtraData(const name: string): string;
//begin
// Result := FIniFile.ReadString('Token', name, '');
//end;
function TTokenManager.RetrieveExtraSectionData(const section, name: string): string;
begin
Result := FIniFile.ReadString(section, name, '');
end;
procedure TTokenManager.StoreEncryptedToken(const inSection: string; const inName: string; const Token: string);
var
EncryptedToken: string;
begin
EncryptedToken := ProtectSecret(Token);
FIniFile.WriteString(inSection, inName, EncryptedToken);
end;
//
//procedure TTokenManager.StoreExtraData(const Name: string; const Value: string);
//begin
// FIniFile.WriteString('Token', Name, Value);
//end;
procedure TTokenManager.StoreExtraSectionData(section: string; const Name, Value: string);
begin
FIniFile.WriteString(section, Name, Value);
end;
end.