/// <summary>
/// When overridden in a derived class, specifies a common dialog box.
/// </summary>
/// <param name="hwndOwner">A value that represents the window handle of the owner window for the common dialog box.</param>
/// <returns>
/// true if the dialog box was successfully run; otherwise, false.
/// </returns>
protected override bool RunDialog(IntPtr hwndOwner)
{
if (Environment.OSVersion.Version.Major < 5)
{
throw new PlatformNotSupportedException(Properties.Resources.FunctionNotSupported);
}
UnsafeNativeMethods.CredUIInfo credInfo = new UnsafeNativeMethods.CredUIInfo(hwndOwner,
this.caption, this.message, this.banner);
StringBuilder usr = new StringBuilder(UnsafeNativeMethods.CREDUI_MAX_USERNAME_LENGTH);
StringBuilder pwd = new StringBuilder(UnsafeNativeMethods.CREDUI_MAX_PASSWORD_LENGTH);
if (this.credentials != null)
{
usr.Append(this.credentials.PrincipalName);
pwd.Append(this.credentials.PasswordToString());
}
try
{
//For more info see:
//http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthn/security/creduipromptforcredentials.asp
//http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnnetsec/html/dpapiusercredentials.asp?frame=true
UnsafeNativeMethods.CredUIReturnCodes result = UnsafeNativeMethods.CredUIPromptForCredentials(
ref credInfo, this.target,
IntPtr.Zero, 0,
usr, UnsafeNativeMethods.CREDUI_MAX_USERNAME_LENGTH,
pwd, UnsafeNativeMethods.CREDUI_MAX_PASSWORD_LENGTH,
ref this.saveChecked, this.flags);
switch (result)
{
case UnsafeNativeMethods.CredUIReturnCodes.NO_ERROR:
this.Credentials = new SecureCredential(usr.ToString(), pwd);
return(true);
case UnsafeNativeMethods.CredUIReturnCodes.ERROR_CANCELLED:
this.Credentials = null;
return(false);
default:
throw new InvalidOperationException(TranslateReturnCode(result));
}
}
finally
{
usr.Remove(0, usr.Length);
pwd.Remove(0, pwd.Length);
if (this.banner != null)
{
UnsafeNativeMethods.DeleteObject(credInfo.hbmBanner);
}
}
}
/// <summary>
/// The ConfirmCredentials method is called after ShowDialog,
/// to confirm the validity of the credential harvested.
/// </summary>
/// <remarks>
/// After calling ShowDialog and before calling <see cref="ConfirmCredentials"/>,
/// the caller must determine whether or not the credentials are actually valid by
/// using the credentials to access the resource specified by targetName.
/// The results of that validation test are passed to <see cref="ConfirmCredentials"/> in the
/// confirm parameter.
/// </remarks>
/// <param name="confirm">Specifies whether the credentials returned from the prompt function are valid.
/// If TRUE, the credentials are stored in the credential manager.
/// If FALSE, the credentials are not stored and various pieces of memory are cleaned up.
/// </param>
/// <permission cref="UIPermission">Demand for <see cref="UIPermissionWindow.SafeSubWindows"/> permission.</permission>
public void ConfirmCredentials(bool confirm)
{
new UIPermission(UIPermissionWindow.SafeSubWindows).Demand();
UnsafeNativeMethods.CredUIReturnCodes result = UnsafeNativeMethods.CredUIConfirmCredentialsW(this.target, confirm);
if (result != UnsafeNativeMethods.CredUIReturnCodes.NO_ERROR &&
result != UnsafeNativeMethods.CredUIReturnCodes.ERROR_NOT_FOUND &&
result != UnsafeNativeMethods.CredUIReturnCodes.ERROR_INVALID_PARAMETER)
{
throw new InvalidOperationException(TranslateReturnCode(result));
//Trace.TraceError(TranslateReturnCode(result));
}
}
private void LoadUserDomainValues()
{
StringBuilder user = new StringBuilder(UnsafeNativeMethods.CREDUI_MAX_USERNAME_LENGTH);
StringBuilder domain = new StringBuilder(UnsafeNativeMethods.CREDUI_MAX_DOMAIN_TARGET_LENGTH);
UnsafeNativeMethods.CredUIReturnCodes result = UnsafeNativeMethods.CredUIParseUserNameW(this.principalName,
user, UnsafeNativeMethods.CREDUI_MAX_USERNAME_LENGTH, domain, UnsafeNativeMethods.CREDUI_MAX_DOMAIN_TARGET_LENGTH);
if (result == UnsafeNativeMethods.CredUIReturnCodes.NO_ERROR)
{
this.user = user.ToString();
this.domain = domain.ToString();
}
else
{
this.user = this.principalName;
this.domain = Environment.MachineName;
}
}
private static string TranslateReturnCode(UnsafeNativeMethods.CredUIReturnCodes result)
{
return(string.Format(CultureInfo.CurrentUICulture, Properties.Resources.CredUIReturn, result.ToString()));
}
