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/*============LICENSE_START=======================================================
* aaf-certservice-client
* ================================================================================
* Copyright (C) 2020 Nokia. All rights reserved.
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
package org.onap.aaf.certservice.client.certification.conversion;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.StringReader;
import java.security.KeyStore;
import java.security.KeyStore.LoadStoreParameter;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.util.List;
import java.util.Optional;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cert.jcajce.JcaX509CertificateConverter;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.openssl.PEMParser;
import org.onap.aaf.certservice.client.certification.exception.PemToPKCS12ConverterException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
class PemToPKCS12Converter {
private static final Logger LOGGER = LoggerFactory.getLogger(PemToPKCS12Converter.class);
private static final String PKCS12 = "PKCS12";
private static final String PASSWORD_ERROR_MSG = "Password should be min. 16 chars long and should contain only alphanumeric characters and special characters like Underscore (_), Dollar ($) and Pound (#)";
private final LoadStoreParameter EMPTY_KEYSTORE_CONFIGURATION = null;
byte[] convertKeystore(List<String> certificateChain, Password password, String alias, PrivateKey privateKey)
throws PemToPKCS12ConverterException {
LOGGER.info("Conversion of PEM certificates to PKCS12 keystore");
return convert(certificateChain, password, certs -> getKeyStore(alias, password, certs, privateKey));
}
byte[] convertTruststore(List<String> trustAnchors, Password password, String alias)
throws PemToPKCS12ConverterException {
LOGGER.info("Conversion of PEM certificates to PKCS12 truststore");
return convert(trustAnchors, password, certs -> getTrustStore(alias, certs));
}
private byte[] convert(List<String> certificates, Password password, StoreEntryOperation operation)
throws PemToPKCS12ConverterException {
checkPassword(password);
final Certificate[] X509Certificates = convertToCertificateArray(certificates);
return getKeyStoreBytes(password, operation, X509Certificates);
}
private void checkPassword(Password password) throws PemToPKCS12ConverterException {
if (!password.isCorrectPasswordPattern()) {
LOGGER.error(PASSWORD_ERROR_MSG);
throw new PemToPKCS12ConverterException(PASSWORD_ERROR_MSG);
}
}
private byte[] getKeyStoreBytes(Password password, StoreEntryOperation op, Certificate[] x509Certificates)
throws PemToPKCS12ConverterException {
try (ByteArrayOutputStream bos = new ByteArrayOutputStream()) {
KeyStore ks = op.getStore(x509Certificates);
ks.store(bos, password.toCharArray());
return bos.toByteArray();
} catch (IOException | CertificateException | NoSuchAlgorithmException | KeyStoreException e) {
LOGGER.error("Pem to PKCS12 converter failed, exception message: {}", e.getMessage());
throw new PemToPKCS12ConverterException(e);
}
}
private KeyStore getKeyStore(String alias, Password password, Certificate[] certificates, PrivateKey privateKey)
throws KeyStoreException, CertificateException, NoSuchAlgorithmException, IOException {
KeyStore ks = getKeyStoreInstance();
ks.setKeyEntry(alias, privateKey, password.toCharArray(), certificates);
return ks;
}
private KeyStore getTrustStore(String alias, Certificate[] certificates)
throws KeyStoreException, CertificateException, NoSuchAlgorithmException, IOException {
KeyStore ks = getKeyStoreInstance();
long i = 1L;
for (Certificate c : certificates) {
ks.setCertificateEntry(alias + i++, c);
}
return ks;
}
private KeyStore getKeyStoreInstance()
throws KeyStoreException, CertificateException, NoSuchAlgorithmException, IOException {
KeyStore ks = KeyStore.getInstance(PKCS12);
ks.load(EMPTY_KEYSTORE_CONFIGURATION);
return ks;
}
private Certificate[] convertToCertificateArray(List<String> certificates)
throws PemToPKCS12ConverterException {
Certificate[] parsedCertificates = new Certificate[certificates.size()];
for (String certificate : certificates) {
parsedCertificates[certificates.indexOf(certificate)] = parseCertificate(certificate);
}
return parsedCertificates;
}
private Certificate parseCertificate(String certificate) throws PemToPKCS12ConverterException {
try (PEMParser pem = new PEMParser(new StringReader(certificate))) {
X509CertificateHolder certHolder = Optional.ofNullable((X509CertificateHolder) pem.readObject())
.orElseThrow(
() -> new PemToPKCS12ConverterException("The certificate couldn't be parsed correctly. " + certificate));
return new JcaX509CertificateConverter()
.setProvider(new BouncyCastleProvider())
.getCertificate(certHolder);
} catch (IOException | CertificateException e) {
LOGGER.error("Certificates conversion failed, exception message: {}", e.getMessage());
throw new PemToPKCS12ConverterException(e);
}
}
}
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