internal static bool PromptForCredentials(string target, ref bool save, string Message, string Caption,
out string user, out string password, out string domain)
{
NativeCode.CredentialUIInfo credUI = new NativeCode.CredentialUIInfo();
credUI.pszMessageText = Message;
credUI.pszCaptionText = Caption;
return(PromptForCredentials(target, credUI, ref save, out user, out password, out domain));
}
private static bool PromptForCredentials(string target, NativeCode.CredentialUIInfo credUI, ref bool save,
out string user, out string password, out string domain)
{
user = String.Empty;
password = String.Empty;
domain = String.Empty;
// Setup the flags and variables
credUI.cbSize = Marshal.SizeOf(credUI);
int errorcode = 0;
uint dialogReturn;
uint authPackage = 0;
IntPtr outCredBuffer = new IntPtr();
uint outCredSize;
var flags = NativeCode.PromptForWindowsCredentialsFlags.GenericCredentials |
NativeCode.PromptForWindowsCredentialsFlags.EnumerateCurrentUser;
flags = save ? flags | NativeCode.PromptForWindowsCredentialsFlags.ShowCheckbox : flags;
// Setup the flags and variables
int result = NativeCode.CredUIPromptForWindowsCredentials(ref credUI,
errorcode,
ref authPackage,
IntPtr.Zero,
0,
out outCredBuffer,
out outCredSize,
ref save,
flags);
var usernameBuf = new StringBuilder(100);
var passwordBuf = new StringBuilder(100);
var domainBuf = new StringBuilder(100);
int maxUserName = 100;
int maxDomain = 100;
int maxPassword = 100;
if (result == 0)
{
if (NativeCode.CredUnPackAuthenticationBuffer(0, outCredBuffer, outCredSize, usernameBuf,
ref maxUserName,
domainBuf, ref maxDomain, passwordBuf, ref maxPassword))
{
user = usernameBuf.ToString();
password = passwordBuf.ToString();
domain = domainBuf.ToString();
if (String.IsNullOrWhiteSpace(domain))
{
Debug.WriteLine("Domain null");
if (!ParseUserName(usernameBuf.ToString(), maxUserName, maxDomain, out user, out domain))
{
user = usernameBuf.ToString();
}
password = passwordBuf.ToString();
}
}
//mimic SecureZeroMem function to make sure buffer is zeroed out. SecureZeroMem is not an exported function, neither is RtlSecureZeroMemory
var zeroBytes = new byte[outCredSize];
Marshal.Copy(zeroBytes, 0, outCredBuffer, (int)outCredSize);
//clear the memory allocated by CredUIPromptForWindowsCredentials
NativeCode.CoTaskMemFree(outCredBuffer);
return(true);
}
user = null;
domain = null;
return(false);
}