I am trying to implement a custom ssl trustmanager for google.com. I exported the certificate in DER encoded binary X.509(.CER) format from google.com using the certificate export wizard in chrome.
Next I am using the certificate to implement a X509TrustManager for google.com
I am converting the certificate into an array of X509Certificate. I am doing a check on the public key of the exported certificate and the certificate chain which I get from google in checkServerTrusted() method.
This is my implementation
import java.io.FileInputStream;
import java.io.IOException;
import java.security.Key;
import java.security.KeyStore;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.security.interfaces.ECPublicKey;
import java.util.ArrayList;
import java.util.Enumeration;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.SingleClientConnManager;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.apache.http.conn.ssl.AllowAllHostnameVerifier;
import org.jboss.security.Base64Encoder;
public class GetCertificates {
static private TrustManager[] trustmgr = new TrustManager[] { new X509TrustManager() {
private X509Certificate[] compCerts = null;
public void checkClientTrusted(X509Certificate[] certs, String authType) {
System.out.println("checkClientTrusted");
}
public void checkServerTrusted(X509Certificate[] certs, String authType) throws CertificateException {
boolean match = false;
compCerts = getcompanyCerts("C:/Users/vinod/Desktop/certificate tests/googleCert.cer");
for (int i = 0; i < certs.length; i++) {
for (int j = 0; j < compCerts.length; j++) {
PublicKey pubKey = compCerts[j].getPublicKey();
if (certs[i].getPublicKey().equals(pubKey)) {
match = true;
break;
}
}
}
if (!match) {
compCerts = null;
throw new CertificateException();
}
System.out.println("checkServerTrusted");
}
public X509Certificate[] getAcceptedIssuers() {
System.out.println("getAcceptedIssuers");
return compCerts;
}
} };
public void postMessage() {
try {
String server = "google.com";//github.com, google.com,
int port = 443;
String protocol = "https";
String authData = "";
SSLContext sslContext = SSLContext.getInstance("SSL");
sslContext.init(null, trustmgr, new SecureRandom());
SSLSocketFactory sf = new SSLSocketFactory(sslContext, new AllowAllHostnameVerifier());
Scheme httpsScheme = new Scheme("https", port, sf);
SchemeRegistry schemeRegistry = new SchemeRegistry();
schemeRegistry.register(httpsScheme);
ClientConnectionManager cm = new SingleClientConnManager(schemeRegistry);
DefaultHttpClient httpclient = new DefaultHttpClient(cm);
HttpResponse httpClientResponse = null;
HttpRequestBase httpBase = null;
HttpGet httpGet = new HttpGet(protocol + "://" + server + ":" + String.valueOf(port));
httpGet.addHeader("Authorization", "Basic " + authData);
httpGet.addHeader("accept", "application/xml");
httpBase = httpGet;
httpClientResponse = httpclient.execute(httpBase);
System.out.println(httpClientResponse.getStatusLine().getStatusCode());
} catch (Exception ex) {
ex.printStackTrace();
}
}
public static X509Certificate[] getcompanyCerts(String path)
{
try
{
X509Certificate x509Certificate[] = null;
ArrayList<X509Certificate> serverCerts = new ArrayList<X509Certificate>();
Certificate cert = CertificateFactory.getInstance("X.509").generateCertificate(new FileInputStream(path));
X509Certificate cert1 = (X509Certificate) cert;
serverCerts.add(cert1);
x509Certificate = serverCerts.toArray(new X509Certificate[serverCerts.size()]);
return x509Certificate;
}
catch(Exception e)
{
e.printStackTrace();
}
return null;
}
public static void main(String[] args) {
new GetCertificates().postMessage();
}
}
Public key from the certificate which I exported
Sun EC public key, 256 bits public x coord: 103858512549833402870596711608983633962395322362485707804776545539526450437829 public y coord: 551038063834479125183333778395955290333878428073207984470499584820613530179 parameters: secp256r1 [NIST P-256, X9.62 prime256v1] (1.2.840.10045.3.1.7)
Public key from google certificate chain
Sun RSA public key, 2048 bits modulus: 23143370852942880318350916000931697018095187779007718496802621885454913199787528262130121558631489120838817008741156066278392137072461769922534717322344763991314852008921195771153223806536069497781120172866861790294120988948493270866849076947675153622229006495917543748035309441307004545650688546140739858567714350881927672977958435382326618077408774333432728249263290793965486643049909764375831461262493963698376698137704130984951477859888660854457689871626252787358108605089635723759571477994625181232277846364760559779436524005104837073250536963577409319433417664849201259083657597612256894368314574080046815497557 public exponent: 65537
Exported certificate gives Sun EC public key, 256 bits but certificate from google gives Sun RSA public key, 2048 bits. Where am I going wrong. Is the way in which I exported the certificate wrong or any mistake with the way in which I am converting the certificate to X509Certificate.
