| package org.apache.hadoop.hdfsproxy; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.CommonConfigurationKeys; |
| import org.apache.hadoop.security.UserGroupInformation; |
| |
| import javax.servlet.FilterConfig; |
| import javax.servlet.ServletContext; |
| import javax.servlet.ServletException; |
| import javax.servlet.ServletRequest; |
| import java.io.IOException; |
| import java.util.Arrays; |
| |
| /** |
| * This filter is required for hdfsproxies connecting to HDFS |
| * with kerberos authentication. Keytab file and principal to |
| * use for proxy user is retrieved from a configuration file. |
| * If user attribute in ldap doesn't kerberos realm, the |
| * default realm is picked up from configuration. |
| */ |
| public class KerberosAuthorizationFilter extends AuthorizationFilter { |
| |
| private String defaultRealm; |
| |
| @Override |
| public void init(FilterConfig filterConfig) throws ServletException { |
| super.init(filterConfig); |
| Configuration conf = new Configuration(false); |
| conf.addResource("hdfsproxy-default.xml"); |
| conf.addResource("hdfsproxy-site.xml"); |
| initializeUGI(conf); |
| initDefaultRealm(conf); |
| } |
| |
| private void initializeUGI(Configuration conf) { |
| try { |
| conf.set(CommonConfigurationKeys.HADOOP_SECURITY_AUTHENTICATION, |
| "kerberos"); |
| |
| UserGroupInformation.setConfiguration(conf); |
| UserGroupInformation.loginUserFromKeytab( |
| conf.get("hdfsproxy.kerberos.principal"), |
| conf.get("hdfsproxy.kerberos.keytab")); |
| |
| LOG.info(contextPath + " :: Logged in user: " + |
| UserGroupInformation.getLoginUser().getUserName() + |
| ", Current User: " + UserGroupInformation.getCurrentUser().getUserName()); |
| |
| } catch (IOException e) { |
| throw new RuntimeException("Unable to initialize credentials", e); |
| } |
| } |
| |
| private void initDefaultRealm(Configuration conf) { |
| defaultRealm = conf.get("hdfsproxy.kerberos.default.realm",""); |
| } |
| |
| @Override |
| /** If the userid does not have realm, add the default realm */ |
| protected String getUserId(ServletRequest request) { |
| String userId = super.getUserId(request); |
| return userId + |
| (userId.indexOf('@') > 0 ? "" : defaultRealm); |
| } |
| |
| @Override |
| protected String getGroups(ServletRequest request) { |
| UserGroupInformation ugi = UserGroupInformation. |
| createRemoteUser(getUserId(request)); |
| return Arrays.toString(ugi.getGroupNames()); |
| } |
| } |