ProxyAuthenticator.java

/**
 * Copyright 2015 StreamSets Inc.
 *
 * Licensed under the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.streamsets.datacollector.http;

import com.streamsets.datacollector.main.RuntimeInfo;
import com.streamsets.datacollector.util.Configuration;
import com.streamsets.lib.security.http.CORSConstants;
import org.eclipse.jetty.http.HttpHeader;
import org.eclipse.jetty.security.LoginService;
import org.eclipse.jetty.security.ServerAuthException;
import org.eclipse.jetty.security.authentication.FormAuthenticator;
import org.eclipse.jetty.security.authentication.LoginAuthenticator;
import org.eclipse.jetty.security.authentication.SessionAuthentication;
import org.eclipse.jetty.server.Authentication;
import org.eclipse.jetty.server.UserIdentity;
import org.eclipse.jetty.util.B64Code;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.nio.charset.StandardCharsets;


public class ProxyAuthenticator extends LoginAuthenticator {
  private final RuntimeInfo runtimeInfo;
  private final LoginAuthenticator authenticator;
  private final Configuration conf;
  public final static String AUTH_TOKEN = "auth_token";
  public final static String AUTH_USER = "auth_user";
  private final static String TOKEN_AUTHENTICATION_USER_NAME = "admin";


  public ProxyAuthenticator(LoginAuthenticator authenticator, RuntimeInfo runtimeInfo, Configuration conf) {
    this.authenticator = authenticator;
    this.runtimeInfo = runtimeInfo;
    this.conf = conf;
  }

  @Override
  public void prepareRequest(ServletRequest request) {
    super.prepareRequest(request);
    authenticator.prepareRequest(request);
  }

  @Override
  public UserIdentity login(String username, Object password, ServletRequest request) {
    return authenticator.login(username, password, request);
  }

  @Override
  public void setConfiguration(AuthConfiguration configuration) {
    super.setConfiguration(configuration);
    authenticator.setConfiguration(configuration);
  }

  @Override
  public LoginService getLoginService() {
    return authenticator.getLoginService();
  }

  @Override
  protected HttpSession renewSession(HttpServletRequest request, HttpServletResponse response) {
    return super.renewSession(request, response);
  }

  @Override
  public String getAuthMethod() {
    return authenticator.getAuthMethod();
  }

  @Override
  public boolean secureResponse(
      ServletRequest request,
      ServletResponse response,
      boolean mandatory,
      Authentication.User validatedUser
  ) throws ServerAuthException {
    return authenticator.secureResponse(request, response, mandatory, validatedUser);
  }

  @Override
  public Authentication validateRequest(ServletRequest req, ServletResponse res, boolean mandatory)
    throws ServerAuthException {

    HttpServletRequest request = (HttpServletRequest)req;
    HttpServletResponse response = (HttpServletResponse)res;
    HttpSession session = request.getSession(true);
    Authentication authentication = (Authentication) session.getAttribute(SessionAuthentication.__J_AUTHENTICATED);

    // handle CORS Options
    if ("OPTIONS".equals(request.getMethod())) {
      response.setHeader("Access-Control-Allow-Origin", conf.get(CORSConstants.HTTP_ACCESS_CONTROL_ALLOW_ORIGIN,
          CORSConstants.HTTP_ACCESS_CONTROL_ALLOW_ORIGIN_DEFAULT));
      response.setHeader("Access-Control-Allow-Headers", conf.get(CORSConstants.HTTP_ACCESS_CONTROL_ALLOW_HEADERS,
          CORSConstants.HTTP_ACCESS_CONTROL_ALLOW_HEADERS_DEFAULT));
      response.setHeader("Access-Control-Allow-Methods", conf.get(CORSConstants.HTTP_ACCESS_CONTROL_ALLOW_METHODS,
          CORSConstants.HTTP_ACCESS_CONTROL_ALLOW_METHODS_DEFAULT));
      return Authentication.SEND_SUCCESS;
    }

    if (authentication == null) {
      String authToken = request.getHeader(AUTH_TOKEN);
      String authUser = request.getHeader(AUTH_USER);

      if (authToken == null) {
        authToken = request.getParameter(AUTH_TOKEN);
        authUser = request.getParameter(AUTH_USER);

        if (authUser == null) {
          authUser = TOKEN_AUTHENTICATION_USER_NAME;
        }
      }

      if (authToken != null && runtimeInfo.isValidAuthenticationToken(authToken)) {
        SdcHashLoginService loginService = (SdcHashLoginService) getLoginService();
        UserIdentity userIdentity = loginService.getUserIdentity(authUser);
        Authentication cached = new SessionAuthentication(getAuthMethod(), userIdentity, null);
        session.setAttribute(SessionAuthentication.__J_AUTHENTICATED, cached);
      }

      if (this.authenticator instanceof FormAuthenticator) {
        String credentials = request.getHeader(HttpHeader.AUTHORIZATION.asString());
        if (credentials != null) {
          //Support User name and password as part of Authorization Header for Form & Digest Authenticator
          int space = credentials.indexOf(' ');
          if (space > 0) {
            String method=credentials.substring(0,space);
            if ("basic".equalsIgnoreCase(method)) {
              credentials = credentials.substring(space+1);
              credentials = B64Code.decode(credentials, StandardCharsets.ISO_8859_1);
              int i = credentials.indexOf(':');
              if (i > 0) {
                String username = credentials.substring(0,i);
                String password = credentials.substring(i+1);

                UserIdentity userIdentity = login(username, password, request);
                if (userIdentity != null) {
                  Authentication cached = new SessionAuthentication(getAuthMethod(), userIdentity, null);
                  session.setAttribute(SessionAuthentication.__J_AUTHENTICATED, cached);
                } else {
                  try {
                    response.setHeader(HttpHeader.WWW_AUTHENTICATE.asString(),
                      "basic realm=\"" + _loginService.getName() + '"');
                    response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
                    return Authentication.SEND_CONTINUE;
                  } catch (IOException e) {
                    throw new ServerAuthException(e);
                  }
                }
              }
            }
          }
        } else {
          //Handle redirecting to home page instead of REST API page & setting reverse proxy base path
          String pathInfo = request.getPathInfo();
          if ("/j_security_check".equals(pathInfo)) {
            String basePath = request.getParameter("basePath");

            if (basePath == null || basePath.trim().length() == 0) {
              basePath = "/";
            }

            String redirectURL = (String)session.getAttribute(FormAuthenticator.__J_URI);
            if ((redirectURL != null && (redirectURL.contains("rest/v1/") || redirectURL.contains("jmx"))) ||
                !basePath.equals("/")) {
              session.setAttribute(FormAuthenticator.__J_URI, basePath);
            }
          }
        }
      }

    }

    return authenticator.validateRequest(req, res, mandatory);
  }
}