HttpServletTestAuthModule.java

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package com.sun.s1asdev.security.jmac.httpservlet;

import java.io.PrintWriter;
import java.util.Map;
import java.security.AccessController;
import java.security.PrivilegedAction;
import javax.security.auth.Subject;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.message.AuthException;
import javax.security.auth.message.AuthStatus;
import javax.security.auth.message.MessageInfo;
import javax.security.auth.message.MessagePolicy;
import javax.security.auth.message.callback.CallerPrincipalCallback;
import javax.security.auth.message.callback.PasswordValidationCallback;
import javax.security.auth.message.module.ServerAuthModule;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import sun.misc.BASE64Decoder;

public class HttpServletTestAuthModule implements ServerAuthModule {
    private CallbackHandler handler = null;
    private String pc = null;

    public void initialize(MessagePolicy requestPolicy,
               MessagePolicy responsePolicy,
               CallbackHandler handler,
               Map options)
               throws AuthException {
        this.handler = handler;
        if (options != null) {
            this.pc = (String)options.get("javax.security.jacc.PolicyContext");
        }
    }

    public Class[] getSupportedMessageTypes() {
        return new Class[] { HttpServletRequest.class, HttpServletResponse.class };
    }

    public AuthStatus validateRequest(MessageInfo messageInfo,
                               Subject clientSubject,
                               Subject serviceSubject) throws AuthException {

        if (!isMandatory(messageInfo)) {
            return AuthStatus.SUCCESS;
        }

        String username = null;
        String password = null;
        try {
            HttpServletRequest request =
                (HttpServletRequest)messageInfo.getRequestMessage();
            HttpServletResponse response =
                (HttpServletResponse)messageInfo.getResponseMessage();
            String authorization = request.getHeader("authorization");
            if (authorization != null && 
                    authorization.toLowerCase().startsWith("basic ")) {
                authorization = authorization.substring(6).trim();
                BASE64Decoder decoder = new BASE64Decoder();
                byte[] bs = decoder.decodeBuffer(authorization);
                String decodedString = new String(bs);
                int ind = decodedString.indexOf(':');
                if (ind > 0) {
                    username = decodedString.substring(0, ind);
                    password = decodedString.substring(ind + 1);
                }
            }

            if (username == null || password == null) {
                response.setHeader("WWW-Authenticate", "Basic realm=\"default\"");  
                response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
                System.out.println("login prompt for username/password");
                return AuthStatus.SEND_CONTINUE;
            }

            char[] pwd = new char[password.length()];
            password.getChars(0, password.length(), pwd, 0);
            PasswordValidationCallback pwdCallback =
                new PasswordValidationCallback(clientSubject, username, pwd);
            CallerPrincipalCallback cpCallback =
                new CallerPrincipalCallback(clientSubject, username);
            System.out.println("Subject before invoking callbacks: " + clientSubject);
            handler.handle(new Callback[] { pwdCallback, cpCallback });
            System.out.println("Subject after invoking callbacks: " + clientSubject);

            if (pwdCallback.getResult()) {
                request.setAttribute("MY_NAME", getClass().getName());
                request.setAttribute("PC", pc);
                System.out.println("login success: " + username + ", " + password);
                messageInfo.setResponseMessage(new MyHttpServletResponseWrapper(response));
                return AuthStatus.SUCCESS;
            } else {
                System.out.println("login fails: " + username + ", " + password);
                return AuthStatus.SEND_FAILURE;
            }
        } catch(Throwable t) {
            System.out.println("login fails: " + username + ", " + password);
            t.printStackTrace();
            return AuthStatus.SEND_FAILURE;
        }
    }

    public AuthStatus secureResponse(MessageInfo messageInfo,
            Subject serviceSubject) throws AuthException {

        if (!isMandatory(messageInfo)) {
            return AuthStatus.SUCCESS;
        }

        try {
            System.out.println("SR is called");
            HttpServletRequest request =
                (HttpServletRequest)messageInfo.getRequestMessage();
            request.setAttribute("SR", "true");
            MyHttpServletResponseWrapper response =
                (MyHttpServletResponseWrapper)messageInfo.getResponseMessage();
            int count = response.getAdjustedCount();
            PrintWriter writer = response.getWriter();
            writer.println("\nAdjusted count: " + count);
            messageInfo.setResponseMessage(response.getResponse());
            return AuthStatus.SUCCESS;
        } catch(Throwable t) {
            System.out.println("secureResponse fails: " + t);
            return AuthStatus.FAILURE;
        }
    }

    public void cleanSubject(MessageInfo messageInfo, Subject subject)
        throws AuthException {
    }

    private boolean isMandatory(MessageInfo messageInfo) {
        return Boolean.valueOf((String)messageInfo.getMap().get(
            "javax.security.auth.message.MessagePolicy.isMandatory"));
    }
}