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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.athenz.identityprovider;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.ExtensionsGenerator;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.asn1.x509.GeneralNames;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cert.jcajce.JcaX509CertificateConverter;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.openssl.PEMParser;
import org.bouncycastle.openssl.jcajce.JcaPEMWriter;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
import org.bouncycastle.pkcs.PKCS10CertificationRequest;
import org.bouncycastle.pkcs.PKCS10CertificationRequestBuilder;
import org.bouncycastle.pkcs.jcajce.JcaPKCS10CertificationRequestBuilder;
import org.bouncycastle.util.io.pem.PemObject;
import javax.security.auth.x500.X500Principal;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.UncheckedIOException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
/**
* @author bjorncs
*/
class CryptoUtils {
private static final BouncyCastleProvider bouncyCastleProvider = new BouncyCastleProvider();
private CryptoUtils() {}
static KeyPair createKeyPair() {
try {
KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
return kpg.generateKeyPair();
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
}
static PKCS10CertificationRequest createCSR(String identityDomain,
String identityService,
String dnsSuffix,
String providerUniqueId,
KeyPair keyPair) {
try {
// Add SAN dnsname <service>.<domain-with-dashes>.<provider-dnsname-suffix>
// and SAN dnsname <provider-unique-instance-id>.instanceid.athenz.<provider-dnsname-suffix>
GeneralNames subjectAltNames = new GeneralNames(new GeneralName[]{
new GeneralName(GeneralName.dNSName, String.format("%s.%s.%s",
identityService,
identityDomain.replace(".", "-"),
dnsSuffix)),
new GeneralName(GeneralName.dNSName, String.format("%s.instanceid.athenz.%s",
providerUniqueId,
dnsSuffix))
});
ExtensionsGenerator extGen = new ExtensionsGenerator();
extGen.addExtension(Extension.subjectAlternativeName, false, subjectAltNames);
X500Principal subject = new X500Principal(
String.format("CN=%s.%s", identityDomain, identityService));
PKCS10CertificationRequestBuilder requestBuilder =
new JcaPKCS10CertificationRequestBuilder(subject, keyPair.getPublic());
requestBuilder.addAttribute(PKCSObjectIdentifiers.pkcs_9_at_extensionRequest, extGen.generate());
return requestBuilder.build(new JcaContentSignerBuilder("SHA256withRSA").build(keyPair.getPrivate()));
} catch (OperatorCreationException e) {
throw new RuntimeException(e);
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
static String toPem(PKCS10CertificationRequest csr) {
try (StringWriter stringWriter = new StringWriter(); JcaPEMWriter pemWriter = new JcaPEMWriter(stringWriter)) {
pemWriter.writeObject(new PemObject("CERTIFICATE REQUEST", csr.getEncoded()));
pemWriter.flush();
return stringWriter.toString();
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
static X509Certificate parseCertificate(String pemEncodedCertificate) {
try (PEMParser parser = new PEMParser(new StringReader(pemEncodedCertificate))) {
Object pemObject = parser.readObject();
if (pemObject instanceof X509Certificate) {
return (X509Certificate) pemObject;
}
if (pemObject instanceof X509CertificateHolder) {
return new JcaX509CertificateConverter()
.setProvider(bouncyCastleProvider)
.getCertificate((X509CertificateHolder) pemObject);
}
throw new IllegalArgumentException("Invalid type of PEM object: " + pemObject);
} catch (IOException e) {
throw new UncheckedIOException(e);
} catch (CertificateException e) {
throw new RuntimeException(e);
}
}
}
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