private bool PromptForCredentialsCredUI(IntPtr owner, bool storedCredentials)
{
NativeMethods.CREDUI_INFO info = CreateCredUIInfo(owner, true);
NativeMethods.CREDUI_FLAGS flags = NativeMethods.CREDUI_FLAGS.GENERIC_CREDENTIALS | NativeMethods.CREDUI_FLAGS.DO_NOT_PERSIST | NativeMethods.CREDUI_FLAGS.ALWAYS_SHOW_UI;
if( ShowSaveCheckBox )
flags |= NativeMethods.CREDUI_FLAGS.SHOW_SAVE_CHECK_BOX;
StringBuilder user = new StringBuilder(NativeMethods.CREDUI_MAX_USERNAME_LENGTH);
user.Append(UserName);
StringBuilder pw = new StringBuilder(NativeMethods.CREDUI_MAX_PASSWORD_LENGTH);
pw.Append(Password);
NativeMethods.CredUIReturnCodes result = NativeMethods.CredUIPromptForCredentials(ref info, Target, IntPtr.Zero, 0, user, NativeMethods.CREDUI_MAX_USERNAME_LENGTH, pw, NativeMethods.CREDUI_MAX_PASSWORD_LENGTH, ref _isSaveChecked, flags);
switch( result )
{
case NativeMethods.CredUIReturnCodes.NO_ERROR:
UserName = user.ToString();
Password = pw.ToString();
if( ShowSaveCheckBox )
{
_confirmTarget = Target;
// If the credential was stored previously but the user has now cleared the save checkbox,
// we want to delete the credential.
if( storedCredentials && !IsSaveChecked )
DeleteCredential(Target);
}
return true;
case NativeMethods.CredUIReturnCodes.ERROR_CANCELLED:
return false;
default:
throw new CredentialException((int)result);
}
}
private NativeMethods.CREDUI_INFO CreateCredUIInfo(IntPtr owner, bool downlevelText)
{
NativeMethods.CREDUI_INFO info = new NativeMethods.CREDUI_INFO();
info.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(info);
info.hwndParent = owner;
if( downlevelText )
{
info.pszCaptionText = WindowTitle;
switch( DownlevelTextMode )
{
case DownlevelTextMode.MainInstructionAndContent:
if( MainInstruction.Length == 0 )
info.pszMessageText = Content;
else if( Content.Length == 0 )
info.pszMessageText = MainInstruction;
else
info.pszMessageText = MainInstruction + Environment.NewLine + Environment.NewLine + Content;
break;
case DownlevelTextMode.MainInstructionOnly:
info.pszMessageText = MainInstruction;
break;
case DownlevelTextMode.ContentOnly:
info.pszMessageText = Content;
break;
}
}
else
{
// Vista and later don't use the window title.
info.pszMessageText = Content;
info.pszCaptionText = MainInstruction;
}
return info;
}
private bool PromptForCredentialsCredUIWin(IntPtr owner, bool storedCredentials)
{
NativeMethods.CREDUI_INFO info = CreateCredUIInfo(owner, false);
NativeMethods.CredUIWinFlags flags = NativeMethods.CredUIWinFlags.Generic;
if (ShowSaveCheckBox)
{
flags |= NativeMethods.CredUIWinFlags.Checkbox;
}
IntPtr inBuffer = IntPtr.Zero;
IntPtr outBuffer = IntPtr.Zero;
try
{
uint inBufferSize = 0;
if (UserName.Length > 0)
{
NativeMethods.CredPackAuthenticationBuffer(0, UserName, Password, IntPtr.Zero, ref inBufferSize);
if (inBufferSize > 0)
{
inBuffer = Marshal.AllocCoTaskMem((int)inBufferSize);
if (!NativeMethods.CredPackAuthenticationBuffer(0, UserName, Password, inBuffer, ref inBufferSize))
{
throw new CredentialException(Marshal.GetLastWin32Error());
}
}
}
uint outBufferSize;
uint package = 0;
NativeMethods.CredUIReturnCodes result = NativeMethods.CredUIPromptForWindowsCredentials(ref info, 0, ref package, inBuffer, inBufferSize, out outBuffer, out outBufferSize, ref _isSaveChecked, flags);
switch (result)
{
case NativeMethods.CredUIReturnCodes.NO_ERROR:
StringBuilder userName = new StringBuilder(NativeMethods.CREDUI_MAX_USERNAME_LENGTH);
StringBuilder password = new StringBuilder(NativeMethods.CREDUI_MAX_PASSWORD_LENGTH);
uint userNameSize = (uint)userName.Capacity;
uint passwordSize = (uint)password.Capacity;
uint domainSize = 0;
if (!NativeMethods.CredUnPackAuthenticationBuffer(0, outBuffer, outBufferSize, userName, ref userNameSize, null, ref domainSize, password, ref passwordSize))
{
throw new CredentialException(Marshal.GetLastWin32Error());
}
UserName = userName.ToString();
Password = password.ToString();
if (ShowSaveCheckBox)
{
_confirmTarget = Target;
// If the credential was stored previously but the user has now cleared the save checkbox,
// we want to delete the credential.
if (storedCredentials && !IsSaveChecked)
{
DeleteCredential(Target);
}
}
return(true);
case NativeMethods.CredUIReturnCodes.ERROR_CANCELLED:
return(false);
default:
throw new CredentialException((int)result);
}
}
finally
{
if (inBuffer != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(inBuffer);
}
if (outBuffer != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(outBuffer);
}
}
}
private NativeMethods.CREDUI_INFO CreateCredUIInfo(IntPtr owner, bool downlevelText)
{
NativeMethods.CREDUI_INFO info = new NativeMethods.CREDUI_INFO();
info.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(info);
info.hwndParent = owner;
if( downlevelText )
{
info.pszCaptionText = WindowTitle;
switch( DownlevelTextMode )
{
case DownlevelTextMode.MainInstructionAndContent:
if( MainInstruction.Length == 0 )
info.pszMessageText = Content;
else if( Content.Length == 0 )
info.pszMessageText = MainInstruction;
else
info.pszMessageText = MainInstruction + Environment.NewLine + Environment.NewLine + Content;
break;
case DownlevelTextMode.MainInstructionOnly:
info.pszMessageText = MainInstruction;
break;
case DownlevelTextMode.ContentOnly:
info.pszMessageText = Content;
break;
}
}
else
{
// Vista and later don't use the window title.
info.pszMessageText = Content;
info.pszCaptionText = MainInstruction;
}
return info;
}