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From "Mat Gessel (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HTTPCLIENT-1457) HttpClientBuilder.useSystemProperties() is incompatible with NTLM scheme
Date Thu, 06 Feb 2014 23:55:19 GMT
Mat Gessel created HTTPCLIENT-1457:
--------------------------------------

             Summary: HttpClientBuilder.useSystemProperties() is incompatible with NTLM scheme
                 Key: HTTPCLIENT-1457
                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1457
             Project: HttpComponents HttpClient
          Issue Type: Bug
          Components: HttpAuth, HttpClient
    Affects Versions: 4.3.2
         Environment: Client: JRE 5 - JRE 7
Proxy: Squid with Winbind & NTLM authentication
Auth server: Windows server 2003 / 2008
            Reporter: Mat Gessel


I ran into this with NTLM proxy authentication. 

Summary: 
HttpClientBuilder.useSystemProperties() results in SystemDefaultCredentialsProvider being
specified. SystemDefaultCredentialsProvider delegates authentication to java.net.Authenticator
and always returns credentials as UsernamePasswordCredentials. NTLMScheme expects credentials
to be an instance of NTCredentials.

Note: This works in "plain old Java". That is: URL connections work through an NTLM authenticating
proxy if the default java.net.Authenticator is set. 

NTLMScheme casts provided credentials to NTCredentials, generating an exception. The end result
(for proxy auth) is a HTTP 407 status and the following log message: 

WARN org.apache.http.impl.auth.HttpAuthenticator - NTLM authentication error: Credentials
cannot be used for NTLM authentication: org.apache.http.auth.UsernamePasswordCredentials

Nitpick: NTLMScheme.authenticate() should guard the argument with an  "instanceof" instead
of catching a ClassCastException. 

The code boils down to this: 
java.net.Authenticator.setDefault(new Authenticator()
{
    @Override
    protected PasswordAuthentication getPasswordAuthentication()
    {
        if (getRequestorType() == RequestorType.PROXY)
        {
            String prot = getRequestingProtocol().toLowerCase();
            String host = System.getProperty(prot + ".proxyHost", "");
            String port = System.getProperty(prot + ".proxyPort", "80");
            String user = System.getProperty(prot + ".proxyUser", "");
            String password = System.getProperty(prot + ".proxyPassword", "");

            if (getRequestingHost().equalsIgnoreCase(host))
            {
                if (port != null && port.equals(Integer.toString(getRequestingPort())))
                {
                    return new PasswordAuthentication(user, password.toCharArray());
                }
            }
        }
        return null;
    }
});


HttpClients.custom().useSystemProperties().build().execute(new HttpGet("http://example.com"));



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