internal static extern int CredUIPromptForWindowsCredentials(ref CredentialUIInfo creditUR,
int authError,
ref uint authPackage,
IntPtr InAuthBuffer,
uint InAuthBufferSize,
out IntPtr refOutAuthBuffer,
out uint refOutAuthBufferSize,
ref bool fSave,
PromptForWindowsCredentialsFlags flags);
private static extern uint CredUIPromptForWindowsCredentials(ref CreduiInfo notUsedHere,
int authError,
ref uint authPackage,
IntPtr inAuthBuffer,
uint inAuthBufferSize,
out IntPtr refOutAuthBuffer,
out uint refOutAuthBufferSize,
ref bool save,
PromptForWindowsCredentialsFlags flags);
public static extern CredUIReturnCodes CredUIPromptForWindowsCredentials(
ref CREDUI_INFO uiInfo,
int authError,
ref int authPackage,
IntPtr InAuthBuffer,
int InAuthBufferSize,
out IntPtr refOutAuthBuffer,
out int refOutAuthBufferSize,
ref bool fSave,
PromptForWindowsCredentialsFlags flags);
public static extern int CredUIPromptForWindowsCredentials(ref CREDUI_INFO uiInfo, int authError, ref uint authPackage,
IntPtr InAuthBuffer, uint InAuthBufferSize,
out IntPtr refOutAuthBuffer, out uint refOutAuthBufferSize,
ref bool fSave, PromptForWindowsCredentialsFlags flags);
protected override void EndProcessing()
{
// Create a new CREDUI_INFO object & set default properties
CREDUI_INFO credui = new CREDUI_INFO();
credui.pszCaptionText = "Please enter your credentials";
credui.pszMessageText = "";
credui.cbSize = Marshal.SizeOf(credui);
uint authPackage = 0;
IntPtr outCredBuffer = new IntPtr();
uint outCredSize;
// Instantaniate the credential flags
PromptForWindowsCredentialsFlags flags = new PromptForWindowsCredentialsFlags();
// Launch the credential window
bool save = false;
uint result = CredUIPromptForWindowsCredentials(
ref credui,
0,
ref authPackage,
IntPtr.Zero,
0,
out outCredBuffer,
out outCredSize,
ref save,
flags);
// Create the buffers
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 (CredUnPackAuthenticationBuffer(0, outCredBuffer, outCredSize, usernameBuf, ref maxUserName, domainBuf, ref maxDomain, passwordBuf, ref maxPassword))
{
// Create a new PSCredential
SecureString secure = new SecureString();
char[] chars = new char[passwordBuf.Length];
passwordBuf.CopyTo(0, chars, 0, passwordBuf.Length);
foreach (char ch in chars)
{
secure.AppendChar(ch);
}
credential = new PSCredential(usernameBuf.ToString(), secure);
}
}
else
{
// Throw an error
ErrorRecord error = new ErrorRecord(
new Exception("Credentials were not provided or the dialog was closed unexpectedly"),
"UnexpectedResult",
ErrorCategory.CloseError,
result);
ThrowTerminatingError(error);
}
WriteObject(credential);
}
private DialogResult ShowDialogAux()
{
int errorcode = 0; // If zero, displays no message. Otherwise, gives a reason why we are asking for the credentials - what went wrong.
uint dialogReturn;
uint authPackage = 0;
IntPtr outCredBuffer;
uint outCredSize;
CREDUI_INFO credui = new CREDUI_INFO();
credui.cbSize = Marshal.SizeOf(credui);
credui.pszCaptionText = Caption;
credui.pszMessageText = Message;
credui.hwndParent = ParentForm.Handle;
const int ERROR_SUCCESS = 0x00000000;
const int ERROR_CANCELLED = 0x000004C7;
PromptForWindowsCredentialsFlags flags = (PromptForWindowsCredentialsFlags)0;
if (ProvideSaveCheckbox)
{
flags |= PromptForWindowsCredentialsFlags.CREDUIWIN_CHECKBOX;
}
flags |= PromptForWindowsCredentialsFlags.CREDUIWIN_GENERIC;
//Show the dialog
dialogReturn = CredUIPromptForWindowsCredentials(ref credui,
errorcode,
ref authPackage,
(IntPtr)0, //You can force that a specific username is shown in the dialog. Create it with 'CredPackAuthenticationBuffer()'. Then, the buffer goes here...
0, //...and the size goes here. You also have to add CREDUIWIN_IN_CRED_ONLY to the flags (last argument).
out outCredBuffer,
out outCredSize,
ref SaveRequested,
0); //Use the PromptForWindowsCredentialsFlags-Enum here. You can use multiple flags if you seperate them with | .
if (dialogReturn != ERROR_SUCCESS)
{
throw new Exception("Unable to prompt for Windows credentials.");
}
try
{
if (dialogReturn == ERROR_CANCELLED)
{
return(DialogResult.Cancel);
}
var usernameBuf = new StringBuilder(256);
var passwordBuf = new StringBuilder(256);
var domainBuf = new StringBuilder(256);
for (;;)
{
int maxUserName = usernameBuf.Capacity;
int maxDomain = domainBuf.Capacity;
int maxPassword = passwordBuf.Capacity;
int dwUnpackFlags = CRED_PACK_PROTECTED_CREDENTIALS;
bool Success = CredUnPackAuthenticationBuffer(dwUnpackFlags, outCredBuffer, outCredSize, usernameBuf, ref maxUserName, domainBuf, ref maxDomain, passwordBuf, ref maxPassword);
if (Success)
{
Credentials = new NetworkCredential()
{
UserName = usernameBuf.ToString(),
Password = passwordBuf.ToString(),
Domain = domainBuf.ToString()
};
return(DialogResult.OK);
}
const int ERROR_INSUFFICIENT_BUFFER = 122;
int LastError = Marshal.GetLastWin32Error();
if (LastError == ERROR_INSUFFICIENT_BUFFER)
{
if (usernameBuf.Capacity >= 65535)
{
throw new NotSupportedException();
}
usernameBuf.EnsureCapacity(Math.Min(65535, usernameBuf.Capacity * 2));
passwordBuf.EnsureCapacity(Math.Min(65535, passwordBuf.Capacity * 2));
domainBuf.EnsureCapacity(Math.Min(65535, domainBuf.Capacity * 2));
}
else
{
throw new Win32Exception(LastError);
}
}
}
finally
{
// TODO: Should call SecureZeroMemory(), but this is a C++ inline function.
//clear the memory allocated by CredUIPromptForWindowsCredentials
CoTaskMemFree(outCredBuffer);
}
}
