io.github.stewseo.client.transport.TransportUtils Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of yelp-fusion-client Show documentation
java client to build api objects, handle http transport, and parse/deserialize/serialize json to/from json
There is a newer version: 1.8.0
package io.github.stewseo.client.transport;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.*;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.Arrays;

public class TransportUtils {

    public static SSLContext sslContextFromHttpCaCrt(File file) throws IOException {
        try(InputStream in = new FileInputStream(file)) {
            return sslContextFromHttpCaCrt(in);
        }
    }
    public static SSLContext sslContextFromHttpCaCrt(InputStream in) {
        try {
            CertificateFactory cf = CertificateFactory.getInstance("X.509");
            Certificate certificate = cf.generateCertificate(in);

            final KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
            keyStore.load(null, null);
            keyStore.setCertificateEntry("elasticsearch-ca", certificate);

            TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
            tmf.init(keyStore);

            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(null, tmf.getTrustManagers(), null);
            return sslContext;

        } catch (CertificateException | NoSuchAlgorithmException | KeyManagementException | KeyStoreException | IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static SSLContext sslContextFromCaFingerprint(String fingerPrint) {

        fingerPrint = fingerPrint.replace(":", "");
        int len = fingerPrint.length();
        byte[] fpBytes = new byte[len / 2];
        for (int i = 0; i < len; i += 2) {
            fpBytes[i / 2] = (byte) (
                    (Character.digit(fingerPrint.charAt(i), 16) << 4) +
                            Character.digit(fingerPrint.charAt(i+1), 16)
            );
        }

        try {
            X509TrustManager tm = new X509TrustManager() {
                @Override
                public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
                    throw new CertificateException("This is a client-side only trust manager");
                }

                @Override
                public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {

                    // The CA root is the last element of the chain
                    X509Certificate anchor = chain[chain.length - 1];

                    byte[] bytes;
                    try {
                        MessageDigest md = MessageDigest.getInstance("SHA-256");
                        md.update(anchor.getEncoded());
                        bytes = md.digest();
                    } catch (NoSuchAlgorithmException e) {
                        throw new RuntimeException(e);
                    }

                    if (Arrays.equals(fpBytes, bytes)) {
                        return;
                    }

                    throw new CertificateException("Untrusted certificate: " + anchor.getSubjectX500Principal());
                }

                @Override
                public X509Certificate[] getAcceptedIssuers() {
                    return new X509Certificate[0];
                }
            };

            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(null, new X509TrustManager[] { tm }, null);
            return sslContext;

        } catch (NoSuchAlgorithmException | KeyManagementException e) {
            // Exceptions that should normally not occur
            throw new RuntimeException(e);
        }
    }
}