public (string username, SecureString password) ReadUserCredentials(string authority)
{
using (var ch = CredentialHandle.ReadFromCredentialManager(authority)) {
if (ch == null)
{
return(null, null);
}
var credData = ch.GetCredentialData();
return(credData.UserName, SecurityUtilities.SecureStringFromNativeBuffer(credData.CredentialBlob));
}
}
private async Task <Credentials> PromptForWindowsCredentialsAsync(string authority, string workspaceName, CancellationToken cancellationToken)
{
await _services.MainThread().SwitchToAsync(cancellationToken);
var credui = new NativeMethods.CREDUI_INFO {
cbSize = Marshal.SizeOf(typeof(NativeMethods.CREDUI_INFO)),
hwndParent = _services.GetService <IPlatformServices>().ApplicationWindowHandle,
pszCaptionText = Resources.Info_ConnectingTo.FormatInvariant(workspaceName)
};
uint authPkg = 0;
var credStorage = IntPtr.Zero;
var save = true;
var flags = NativeMethods.CredUIWinFlags.CREDUIWIN_CHECKBOX;
// For password, use native memory so it can be securely freed.
var passwordStorage = CreatePasswordBuffer();
var inCredSize = 1024;
var inCredBuffer = Marshal.AllocCoTaskMem(inCredSize);
try {
if (!NativeMethods.CredPackAuthenticationBuffer(0, WindowsIdentity.GetCurrent().Name, "", inCredBuffer, ref inCredSize))
{
var error = Marshal.GetLastWin32Error();
throw new Win32Exception(error);
}
var err = NativeMethods.CredUIPromptForWindowsCredentials(ref credui, 0, ref authPkg, inCredBuffer, (uint)inCredSize, out credStorage, out var credSize, ref save, flags);
if (err != 0)
{
throw new OperationCanceledException();
}
var userNameBuilder = new StringBuilder(NativeMethods.CRED_MAX_USERNAME_LENGTH);
var userNameLen = NativeMethods.CRED_MAX_USERNAME_LENGTH;
var domainBuilder = new StringBuilder(NativeMethods.CRED_MAX_USERNAME_LENGTH);
var domainLen = NativeMethods.CRED_MAX_USERNAME_LENGTH;
var passLen = NativeMethods.CREDUI_MAX_PASSWORD_LENGTH;
if (!NativeMethods.CredUnPackAuthenticationBuffer(NativeMethods.CRED_PACK_PROTECTED_CREDENTIALS, credStorage, credSize, userNameBuilder, ref userNameLen, domainBuilder, ref domainLen, passwordStorage, ref passLen))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
var userName = userNameBuilder.ToString();
var password = SecurityUtilities.SecureStringFromNativeBuffer(passwordStorage);
SaveUserCredentials(authority, userName, password, save);
return(Credentials.Create(userName, password));
} finally {
if (inCredBuffer != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(inCredBuffer);
}
if (credStorage != IntPtr.Zero)
{
Marshal.ZeroFreeCoTaskMemUnicode(credStorage);
}
if (passwordStorage != IntPtr.Zero)
{
Marshal.ZeroFreeCoTaskMemUnicode(passwordStorage);
}
}
}