/// <summary>
/// Extract the stored credential from WIndows Credential store
/// </summary>
/// <param name="Target">Name of the application/Url where the credential is used for</param>
/// <returns>empty credentials if target not found, else stored credentials</returns>
public static NetworkCredential GetCredentials(string Target)
{
IntPtr nCredPtr;
var username = String.Empty;
var passwd = String.Empty;
var domain = String.Empty;
// Make the API call using the P/Invoke signature
bool ret = NativeCode.CredRead(Target, NativeCode.CredentialType.Generic, 0, out nCredPtr);
// If the API was successful then...
if (ret)
{
using (CriticalCredentialHandle critCred = new CriticalCredentialHandle(nCredPtr))
{
Credential cred = critCred.GetCredential();
passwd = cred.CredentialBlob;
var user = cred.UserName;
StringBuilder userBuilder = new StringBuilder();
StringBuilder domainBuilder = new StringBuilder();
var code = NativeCode.CredUIParseUserName(user, userBuilder, int.MaxValue, domainBuilder, int.MaxValue);
//assuming invalid account name to be not meeting condition for CredUIParseUserName
//"The name must be in UPN or down-level format, or a certificate"
if (code == NativeCode.CredentialUIReturnCodes.InvalidAccountName)
{
userBuilder.Append(user);
}
username = userBuilder.ToString();
domain = domainBuilder.ToString();
}
}
return(new NetworkCredential(username, passwd, domain));
}
/// <summary>
/// Accepts credentials in a console window
/// </summary>
/// <param name="Target">A descriptive text for where teh credentials being asked are used for</param>
/// <returns>NetworkCredential object containing the user name, </returns>
public static NetworkCredential PromptForCredentialsConsole(string target)
{
var user = String.Empty;
var password = String.Empty;
var domain = String.Empty;
// Setup the flags and variables
StringBuilder userPassword = new StringBuilder(), userID = new StringBuilder();
bool save = true;
NativeCode.CredentialUIFlags flags = NativeCode.CredentialUIFlags.CompleteUsername |
NativeCode.CredentialUIFlags.ExcludeCertificates;
// Prompt the user
NativeCode.CredentialUIReturnCodes returnCode =
NativeCode.CredUICmdLinePromptForCredentials(target, IntPtr.Zero, 0, userID, 100, userPassword, 100,
ref save, flags);
password = userPassword.ToString();
StringBuilder userBuilder = new StringBuilder();
StringBuilder domainBuilder = new StringBuilder();
returnCode = NativeCode.CredUIParseUserName(userID.ToString(), userBuilder, int.MaxValue, domainBuilder,
int.MaxValue);
switch (returnCode)
{
case NativeCode.CredentialUIReturnCodes.Success: // The username is valid.
user = userBuilder.ToString();
domain = domainBuilder.ToString();
break;
case NativeCode.CredentialUIReturnCodes.InvalidAccountName: // The username is not valid.
user = userID.ToString();
domain = null;
break;
case NativeCode.CredentialUIReturnCodes.InsufficientBuffer: // One of the buffers is too small.
throw new OutOfMemoryException();
case NativeCode.CredentialUIReturnCodes.InvalidParameter
: // ulUserMaxChars or ulDomainMaxChars is zero OR userName, user, or domain is NULL.
throw new ArgumentNullException("userName");
}
return(new NetworkCredential(user, password, domain));
}
private static bool ParseUserName(string usernameBuf, int maxUserName, int maxDomain, out string user,
out string domain)
{
StringBuilder userBuilder = new StringBuilder();
StringBuilder domainBuilder = new StringBuilder();
user = String.Empty;
domain = String.Empty;
var returnCode = NativeCode.CredUIParseUserName(usernameBuf, userBuilder, maxUserName, domainBuilder,
maxDomain);
Debug.WriteLine(returnCode);
switch (returnCode)
{
case NativeCode.CredentialUIReturnCodes.Success: // The username is valid.
user = userBuilder.ToString();
domain = domainBuilder.ToString();
return(true);
}
return(false);
}
