| /** |
| * 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.security.authentication.util; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.UnsupportedEncodingException; |
| import java.security.PublicKey; |
| import java.security.cert.CertificateException; |
| import java.security.cert.CertificateFactory; |
| import java.security.cert.X509Certificate; |
| import java.security.interfaces.RSAPublicKey; |
| |
| import javax.servlet.ServletException; |
| |
| public class CertificateUtil { |
| private static final String PEM_HEADER = "-----BEGIN CERTIFICATE-----\n"; |
| private static final String PEM_FOOTER = "\n-----END CERTIFICATE-----"; |
| |
| /** |
| * Gets an RSAPublicKey from the provided PEM encoding. |
| * |
| * @param pem |
| * - the pem encoding from config without the header and footer |
| * @return RSAPublicKey the RSA public key |
| * @throws ServletException thrown if a processing error occurred |
| */ |
| public static RSAPublicKey parseRSAPublicKey(String pem) throws ServletException { |
| String fullPem = PEM_HEADER + pem + PEM_FOOTER; |
| PublicKey key = null; |
| try { |
| CertificateFactory fact = CertificateFactory.getInstance("X.509"); |
| ByteArrayInputStream is = new ByteArrayInputStream( |
| fullPem.getBytes("UTF8")); |
| |
| X509Certificate cer = (X509Certificate) fact.generateCertificate(is); |
| key = cer.getPublicKey(); |
| } catch (CertificateException ce) { |
| String message = null; |
| if (pem.startsWith(PEM_HEADER)) { |
| message = "CertificateException - be sure not to include PEM header " |
| + "and footer in the PEM configuration element."; |
| } else { |
| message = "CertificateException - PEM may be corrupt"; |
| } |
| throw new ServletException(message, ce); |
| } catch (UnsupportedEncodingException uee) { |
| throw new ServletException(uee); |
| } |
| return (RSAPublicKey) key; |
| } |
| } |