Java tutorial
/* * 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.stratos.keystore.mgt; import org.apache.axiom.om.util.UUIDGenerator; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.bouncycastle.jce.X509Principal; import org.bouncycastle.jce.X509V3CertificateGenerator; import org.wso2.carbon.core.RegistryResources; import org.wso2.carbon.core.util.CryptoUtil; import org.apache.stratos.keystore.mgt.util.RealmServiceHolder; import org.apache.stratos.keystore.mgt.util.RegistryServiceHolder; import org.wso2.carbon.registry.core.Resource; import org.wso2.carbon.registry.core.exceptions.RegistryException; import org.wso2.carbon.registry.core.session.UserRegistry; import org.wso2.carbon.security.SecurityConstants; import org.wso2.carbon.security.keystore.KeyStoreAdmin; import org.wso2.carbon.user.core.service.RealmService; import java.io.ByteArrayOutputStream; import java.math.BigInteger; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.KeyStore; import java.security.SecureRandom; import java.security.cert.X509Certificate; import java.util.Date; /** * This class is used to generate a key store for a tenant and store it in the governance registry. */ public class KeyStoreGenerator { private static Log log = LogFactory.getLog(KeyStoreGenerator.class); private UserRegistry govRegistry; private int tenantId; private String tenantDomain; private String password; public KeyStoreGenerator(int tenantId) throws KeyStoreMgtException { try { this.tenantId = tenantId; this.tenantDomain = getTenantDomainName(); this.govRegistry = RegistryServiceHolder.getRegistryService().getGovernanceSystemRegistry(tenantId); if (govRegistry == null) { log.error("Governance registry instance is null"); throw new KeyStoreMgtException("Governance registry instance is null"); } } catch (RegistryException e) { String errorMsg = "Error while obtaining the governance registry for tenant : " + tenantId; log.error(errorMsg, e); throw new KeyStoreMgtException(errorMsg, e); } } /** * This method first generates the keystore, then persist it in the gov.registry of that tenant * * @throws KeyStoreMgtException Error when generating or storing the keystore */ public void generateKeyStore() throws KeyStoreMgtException { try { password = generatePassword(); KeyStore keyStore = KeyStore.getInstance("JKS"); keyStore.load(null, password.toCharArray()); X509Certificate pubCert = generateKeyPair(keyStore); persistKeyStore(keyStore, pubCert); } catch (Exception e) { String msg = "Error while instantiating a keystore"; log.error(msg, e); throw new KeyStoreMgtException(msg, e); } } /** * This method checks the existance of a keystore * * @return * @throws KeyStoreMgtException */ public boolean isKeyStoreExists() throws KeyStoreMgtException { boolean isKeyStoreExists = false; String keyStoreName = generateKSNameFromDomainName(); try { isKeyStoreExists = govRegistry .resourceExists(RegistryResources.SecurityManagement.KEY_STORES + "/" + keyStoreName); } catch (RegistryException e) { String msg = "Error while checking the existance of keystore"; log.error(msg, e); throw new KeyStoreMgtException(msg, e); } return isKeyStoreExists; } /** * This method generates the keypair and stores it in the keystore * * @param keyStore A keystore instance * @return Generated public key for the tenant * @throws KeyStoreMgtException Error when generating key pair */ private X509Certificate generateKeyPair(KeyStore keyStore) throws KeyStoreMgtException { try { CryptoUtil.getDefaultCryptoUtil(); //generate key pair KeyPairGenerator keyPairGenerator = null; keyPairGenerator = KeyPairGenerator.getInstance("RSA"); keyPairGenerator.initialize(1024); KeyPair keyPair = keyPairGenerator.generateKeyPair(); // Common Name and alias for the generated certificate String commonName = "CN=" + tenantDomain + ", OU=None, O=None L=None, C=None"; //generate certificates X509V3CertificateGenerator v3CertGen = new X509V3CertificateGenerator(); v3CertGen.setSerialNumber(BigInteger.valueOf(new SecureRandom().nextInt())); v3CertGen.setIssuerDN(new X509Principal(commonName)); v3CertGen.setNotBefore(new Date(System.currentTimeMillis() - 1000L * 60 * 60 * 24 * 30)); v3CertGen.setNotAfter(new Date(System.currentTimeMillis() + (1000L * 60 * 60 * 24 * 365 * 10))); v3CertGen.setSubjectDN(new X509Principal(commonName)); v3CertGen.setPublicKey(keyPair.getPublic()); v3CertGen.setSignatureAlgorithm("MD5WithRSAEncryption"); X509Certificate PKCertificate = v3CertGen.generateX509Certificate(keyPair.getPrivate()); //add private key to KS keyStore.setKeyEntry(tenantDomain, keyPair.getPrivate(), password.toCharArray(), new java.security.cert.Certificate[] { PKCertificate }); return PKCertificate; } catch (Exception ex) { String msg = "Error while generating the certificate for tenant :" + tenantDomain + "."; log.error(msg, ex); throw new KeyStoreMgtException(msg, ex); } } /** * Persist the keystore in the gov.registry * * @param keyStore created Keystore of the tenant * @param PKCertificate pub. key of the tenant * @throws KeyStoreMgtException Exception when storing the keystore in the registry */ private void persistKeyStore(KeyStore keyStore, X509Certificate PKCertificate) throws KeyStoreMgtException { try { ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); keyStore.store(outputStream, password.toCharArray()); outputStream.flush(); outputStream.close(); String keyStoreName = generateKSNameFromDomainName(); // Use the keystore using the keystore admin KeyStoreAdmin keystoreAdmin = new KeyStoreAdmin(tenantId, govRegistry); keystoreAdmin.addKeyStore(outputStream.toByteArray(), keyStoreName, password, " ", "JKS", password); //Create the pub. key resource Resource pubKeyResource = govRegistry.newResource(); pubKeyResource.setContent(PKCertificate.getEncoded()); pubKeyResource.addProperty(SecurityConstants.PROP_TENANT_PUB_KEY_FILE_NAME_APPENDER, generatePubKeyFileNameAppender()); govRegistry.put(RegistryResources.SecurityManagement.TENANT_PUBKEY_RESOURCE, pubKeyResource); //associate the public key with the keystore govRegistry.addAssociation(RegistryResources.SecurityManagement.KEY_STORES + "/" + keyStoreName, RegistryResources.SecurityManagement.TENANT_PUBKEY_RESOURCE, SecurityConstants.ASSOCIATION_TENANT_KS_PUB_KEY); } catch (RegistryException e) { String msg = "Error when writing the keystore/pub.cert to registry"; log.error(msg, e); throw new KeyStoreMgtException(msg, e); } catch (Exception e) { String msg = "Error when processing keystore/pub. cert to be stored in registry"; log.error(msg, e); throw new KeyStoreMgtException(msg, e); } } /** * This method is used to generate a random password for the generated keystore * * @return generated password */ private String generatePassword() { SecureRandom random = new SecureRandom(); String randString = new BigInteger(130, random).toString(12); return randString.substring(randString.length() - 10, randString.length()); } /** * This method is used to generate a file name appender for the pub. cert, e.g. * example-com-343743.cert * @return generated string to be used as a file name appender */ private String generatePubKeyFileNameAppender() { String uuid = UUIDGenerator.getUUID(); return uuid.substring(uuid.length() - 6, uuid.length() - 1); } /** * This method generates the key store file name from the Domain Name * @return */ private String generateKSNameFromDomainName() { String ksName = tenantDomain.trim().replace(".", "-"); return (ksName + ".jks"); } private String getTenantDomainName() throws KeyStoreMgtException { RealmService realmService = RealmServiceHolder.getRealmService(); if (realmService == null) { String msg = "Error in getting the domain name, realm service is null."; log.error(msg); throw new KeyStoreMgtException(msg); } try { return realmService.getTenantManager().getDomain(tenantId); } catch (org.wso2.carbon.user.api.UserStoreException e) { String msg = "Error in getting the domain name for the tenant id: " + tenantId; log.error(msg, e); throw new KeyStoreMgtException(msg, e); } } }