org.apache.hive.http.security.PamAuthenticator Maven / Gradle / Ivy

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/*
 * Licensed to 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 org.apache.hive.http.security;

import org.apache.hadoop.hive.conf.HiveConf;
import org.eclipse.jetty.http.HttpHeader;
import org.eclipse.jetty.security.ServerAuthException;
import org.eclipse.jetty.security.UserAuthentication;
import org.eclipse.jetty.security.authentication.DeferredAuthentication;
import org.eclipse.jetty.security.authentication.LoginAuthenticator;
import org.eclipse.jetty.server.Authentication;
import org.eclipse.jetty.server.UserIdentity;
import org.eclipse.jetty.util.B64Code;

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

import net.sf.jpam.Pam;

/*

  This class authenticates HS2 web UI via PAM. To authenticate use

   * httpGet with header name "Authorization"
   * and header value "Basic authB64Code"

    where  authB64Code is Base64 string for "login:password"
 */

public class PamAuthenticator extends LoginAuthenticator {
  private final String pamServiceNames;

  public PamAuthenticator(HiveConf conf) throws AuthenticationException {
    super();
    pamServiceNames = conf.getVar(HiveConf.ConfVars.HIVE_SERVER2_PAM_SERVICES);
    if (pamServiceNames == null || pamServiceNames.trim().isEmpty()) {
      throw new AuthenticationException("No PAM services are set.");
    }
  }

  @Override
  public String getAuthMethod() {
    return "pam";
  }

  @Override
  public Authentication validateRequest(ServletRequest req, ServletResponse res, boolean mandatory)
      throws ServerAuthException {
    HttpServletRequest request = (HttpServletRequest) req;
    HttpServletResponse response = (HttpServletResponse) res;
    String credentials = request.getHeader(HttpHeader.AUTHORIZATION.asString());

    try {
      if (!mandatory)
        return new DeferredAuthentication(this);

      if (credentials != null) {
        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 user = login(username, password);
              if (user != null) {
                return new UserAuthentication(getAuthMethod(), user);
              }
            }
          }
        }
      }

      if (DeferredAuthentication.isDeferred(response))
        return Authentication.UNAUTHENTICATED;

      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);
    }
  }

  protected UserIdentity login(String username, String password) throws AuthenticationException {
    UserIdentity user = null;
    if (authenticate(username, password)) {
      user = new PamUserIdentity(username);
    }
    return user;
  }

  private boolean authenticate(String user, String password) throws AuthenticationException {
    String[] pamServices = pamServiceNames.split(",");
    String errorMsg = "Error authenticating with the PAM service: ";
    for (String pamService : pamServices) {
      try {
        Pam pam = new Pam(pamService);
        if (!pam.authenticateSuccessful(user, password)) {
          return false;
        }
      } catch (Throwable e) {
        // Catch the exception caused by missing jpam.so which otherwise would
        // crashes the thread and causes the client hanging rather than notifying
        // the client nicely
        throw new AuthenticationException(errorMsg + pamService, e);
      }
    }
    return true;
  }

  @Override
  public boolean secureResponse(ServletRequest servletRequest, ServletResponse servletResponse, boolean b,
      Authentication.User user) throws ServerAuthException {
    return true;
  }
}