[jcifs] Why would auth work on one server and not on another?
Dave Mobley
scprotz at hotmail.com
Fri Jul 11 01:35:04 EST 2003
Here is a copy of my sevlet. It is very simple (and the
jcifs.http.NtlmServlet grafted from 0.7.8 with the slight modifications to
make it jdk1.1 and jsdk2.0 compliant). Also, I did rename my servlet and
strip out the cookie handling just to make it simpler.
//// Servlet /////
package com.ibm.lotus.http;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class SampleNtlmServlet extends jcifs.http.NtlmServlet
{
private java.util.Hashtable cache = new java.util.Hashtable();
public void doGet( HttpServletRequest req,
HttpServletResponse resp ) throws IOException, ServletException {
PrintWriter out = resp.getWriter();
resp.setContentType( "text/html" );
String htmlpage =
"<html><head>"+
"</head><body>"+
"User = " + req.getSession(true).getValue("ntlmuser")+
"</body></html>";
out.println(htmlpage);
}
}
///// End Servlet /////
//// jcifs.http.NtlmServlet /////
/* jcifs smb client library in Java
* Copyright (C) 2002 "Michael B. Allen" <jcifs at samba dot org>
* "Eric Glass" <jcifs at samba dot org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package jcifs.http;
import java.io.IOException;
import java.net.UnknownHostException;
import java.util.Enumeration;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
//import javax.servlet.UnavailableException;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import jcifs.Config;
import jcifs.UniAddress;
import jcifs.smb.NtlmPasswordAuthentication;
import jcifs.smb.SmbAuthException;
import jcifs.smb.SmbSession;
import jcifs.util.Base64;
/**
* This servlet may be used with pre-2.3 servlet containers
* to protect content with NTLM HTTP Authentication. Servlets that
* extend this abstract base class may be authenticatied against an SMB
* server or domain controller depending on how the
* <tt>jcifs.smb.client.domain</tt> or <tt>jcifs.http.domainController</tt>
* properties are be specified. <b>With later containers the
* <tt>NtlmHttpFilter</tt> should be used/b>. For custom NTLM HTTP
Authentication schemes the <tt>NtlmSsp</tt> may be used.
* <p>
* Read <a href="../../../ntlmhttpauth.html">jCIFS NTLM HTTP Authentication
and the Network Explorer Servlet</a> related information.
*/
public abstract class NtlmServlet extends HttpServlet {
private static final NtlmSsp AUTH = new NtlmSsp();
private UniAddress domainController;
private boolean enableBasic;
private boolean insecureBasic;
private String realm;
public void init(ServletConfig config) throws ServletException {
super.init(config);
/* Set jcifs properties we know we want; soTimeout and cachePolicy to 10min.
*/
Config.setProperty( "jcifs.smb.client.soTimeout", "300000" );
Config.setProperty( "jcifs.netbios.cachePolicy", "600" );
Enumeration e = config.getInitParameterNames();
String name;
while (e.hasMoreElements()) {
name = (String) e.nextElement();
if (name.startsWith("jcifs.")) {
Config.setProperty(name, config.getInitParameter(name));
}
}
String dc = Config.getProperty("jcifs.http.domainController");
if (dc == null && (dc = Config.getProperty( "jcifs.smb.client.domain" )) ==
null) {
throw new ServletException("No domain controller specified.");
}
try {
domainController = UniAddress.getByName(dc);
} catch (UnknownHostException ex) {
throw new ServletException("Specified DC unreachable.");
}
enableBasic = Boolean.valueOf(
Config.getProperty("jcifs.http.enableBasic")).booleanValue();
insecureBasic = Boolean.valueOf(
Config.getProperty("jcifs.http.insecureBasic")).booleanValue();
realm = Config.getProperty("jcifs.http.basicRealm");
if (realm == null) realm = "jCIFS";
}
protected void service(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
boolean offerBasic = enableBasic &&
(insecureBasic );
//|| request.isSecure());
String msg = request.getHeader("Authorization");
if (msg != null && (msg.startsWith("NTLM ") ||
(offerBasic && msg.startsWith("Basic ")))) {
NtlmPasswordAuthentication ntlm;
if (msg.startsWith("NTLM ")) {
byte[] challenge = SmbSession.getChallenge(domainController);
ntlm = AUTH.doAuthentication(request, response, challenge);
if (ntlm == null) return;
} else {
String auth = new String(Base64.decode(msg.substring(6)),
"US-ASCII");
int index = auth.indexOf(':');
String user = (index != -1) ? auth.substring(0, index) : auth;
String password = (index != -1) ? auth.substring(index + 1) :
"";
index = user.indexOf('\\');
if (index == -1) index = user.indexOf('/');
String domain = (index != -1) ? user.substring(0, index) :
Config.getProperty("jcifs.smb.client.domain");
user = (index != -1) ? user.substring(index + 1) : user;
ntlm = new NtlmPasswordAuthentication(domain, user, password);
}
try {
SmbSession.logon(domainController, ntlm);
} catch (SmbAuthException sae) {
response.setHeader("WWW-Authenticate", "NTLM");
if (offerBasic) {
// modified by dave mobley //
// response.addHeader("WWW-Authenticate", "Basic realm=\"" + realm + "\"");
response.setHeader("WWW-Authenticate", "Basic realm=\"" + realm + "\"");
}
response.setHeader("Connection", "close");
response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
// response.flushBuffer();
return;
}
HttpSession ssn = request.getSession(true);
ssn.putValue("NtlmHttpAuth", ntlm);
ssn.putValue( "ntlmdomain", ntlm.getDomain() );
ssn.putValue( "ntlmuser", ntlm.getUsername() );
} else if (request.getSession(true).getValue("NtlmHttpAuth") == null) {
response.setHeader("WWW-Authenticate", "NTLM");
if (offerBasic) {
response.setHeader("WWW-Authenticate", "Basic realm=\"" +
realm + "\"");
}
response.setHeader("Connection", "close");
response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
// response.flushBuffer();
return;
}
super.service(request, response);
}
}
//// end jcifs.http.NtlmServlet /////
----- Original Message -----
From: <eglass1 at comcast.net>
To: "dave mobley" <scprotz at hotmail.com>
Cc: <Michael_B_Allen at ml.com>; <jcifs at lists.samba.org>
Sent: Thursday, July 10, 2003 6:37 AM
Subject: RE: [jcifs] Why would auth work on one server and not on another?
>
>
> > > >
> > > > 1: IE -> request a page from server
> > > > 2: Server -> tells IE it needs to Auth using NTLM
> > > > 3: IE -> says ok and sends back a blob
> > > > 4: Server -> gets glob, does some fancy footwork, tries to send back
> > >blob,
> > > > but stupid IE has hung up
> > > >
>
> The server is sending
>
> Connection: close
>
> with the Type-2 challenge. This will cause NTLM negotiation to fail.
Doing a
> response.sendError (rather than response.setStatus) can cause this; there
may
> also be a flaw in either the specification or implementation of the older
> Servlet spec that you're using. If you could post some of the relevant
code
> (anything dealing with the servlet response) I can take a look at it.
>
> A persistent connection is typically required by clients which implement
NTLM
> using the Windows SSPI library (including IE and Mozilla). This is an
ease of
> implementation issue. The client has to maintain a handle to an SSPI
security
> context between function calls; the easiest way to do this is just to keep
the
> connection open and pass tokens (i.e., the NTLM messages) back and forth.
If
> the connection is broken, the client loses track of the security context
it was
> in the process of establishing.
>
>
> Eric
>
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