/**
* 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.hadoop.gateway.provider.federation.jwt.filter;
import java.io.IOException;
import java.security.AccessController;
import java.security.Principal;
import java.util.HashMap;
import javax.security.auth.Subject;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.hadoop.gateway.filter.security.AbstractIdentityAssertionFilter;
import org.apache.hadoop.gateway.services.GatewayServices;
import org.apache.hadoop.gateway.services.registry.ServiceRegistry;
import org.apache.hadoop.gateway.services.security.token.JWTokenAuthority;
import org.apache.hadoop.gateway.services.security.token.impl.JWTToken;
import org.apache.hadoop.gateway.util.JsonUtils;
public class JWTAccessTokenAssertionFilter extends AbstractIdentityAssertionFilter {
private static final String SVC_URL = "svc";
private static final String EXPIRES_IN = "expires_in";
private static final String TOKEN_TYPE = "token_type";
private static final String ACCESS_TOKEN = "access_token";
private static final String BEARER = "Bearer ";
private long validity;
private JWTokenAuthority authority = null;
private ServiceRegistry sr;
@Override
public void init( FilterConfig filterConfig ) throws ServletException {
super.init(filterConfig);
String validityStr = filterConfig.getInitParameter("validity");
if (validityStr == null) {
validityStr = "3600"; // 1 hr. in secs
}
validity = Long.parseLong(validityStr);
GatewayServices services = (GatewayServices) filterConfig.getServletContext().getAttribute(GatewayServices.GATEWAY_SERVICES_ATTRIBUTE);
authority = (JWTokenAuthority) services.getService(GatewayServices.TOKEN_SERVICE);
sr = (ServiceRegistry) services.getService(GatewayServices.SERVICE_REGISTRY_SERVICE);
}
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
String jsonResponse = null;
String header = ((HttpServletRequest) request).getHeader("Authorization");
if (header != null && header.startsWith(BEARER)) {
// what follows the bearer designator should be the JWT token being used to request or as an access token
String wireToken = header.substring(BEARER.length());
JWTToken token = JWTToken.parseToken(wireToken);
// ensure that there is a valid jwt token available and that there isn't a misconfiguration of filters
if (token != null) {
authority.verifyToken(token);
}
else {
throw new ServletException("Expected JWT Token not provided as Bearer token");
}
// authorization of the user for the requested service (and resource?) should have been done by
// the JWTFederationFilter - once we get here we can assume that it is authorized and we just need
// to assert the identity via an access token
Subject subject = Subject.getSubject(AccessController.getContext());
String principalName = getPrincipalName(subject);
principalName = mapper.mapUserPrincipal(principalName);
// calculate expiration timestamp: validity * 1000 + currentTimeInMillis
long expires = System.currentTimeMillis() + validity * 1000;
String serviceName = request.getParameter("service-name");
String clusterName = request.getParameter("cluster-name");
String accessToken = getAccessToken(principalName, serviceName, expires);
String serviceURL = sr.lookupServiceURL(clusterName, serviceName);
HashMap<String, Object> map = new HashMap<String, Object>();
// TODO: populate map from JWT authorization code
map.put(ACCESS_TOKEN, accessToken);
map.put(TOKEN_TYPE, BEARER);
map.put(EXPIRES_IN, expires);
// TODO: this url needs to be rewritten when in gateway deployments....
map.put(SVC_URL, serviceURL);
jsonResponse = JsonUtils.renderAsJsonString(map);
response.getWriter().write(jsonResponse);
response.getWriter().flush();
return; // break filter chain
}
else {
// no token provided in header
// something is really wrong since the JWTFederationFilter should have verified its existence already
// TODO: may have to check cookie and url as well before sending error
((HttpServletResponse) response).sendError(HttpServletResponse.SC_UNAUTHORIZED);
return; //break filter chain
}
}
private String getAccessToken(final String principalName, String serviceName, long expires) {
String accessToken = null;
Principal p = new Principal() {
@Override
public String getName() {
// TODO Auto-generated method stub
return principalName;
}
};
JWTToken token = authority.issueToken(p, serviceName, "RS256", expires);
accessToken = token.toString();
return accessToken;
}
}