Lets say I have something like this (client side code):
TrustManager[] trustAllCerts = new TrustManager[]{
new X509TrustManager() {
@Override
public java.security.cert.X509Certificate[] getAcceptedIssuers() {
return null;
}
@Override
public void checkClientTrusted(
java.security.cert.X509Certificate[] certs, String authType) {
}
@Override
public void checkServerTrusted(
java.security.cert.X509Certificate[] certs, String authType) {
}
}
};
SSLContext sslc = SSLContext.getInstance("TLS");
sslc.init(null, trustAllCerts, null);
SocketFactory sf = sslc.getSocketFactory();
SSLSocket s = (SSLSocket) sf.createSocket("127.0.0.1", 9124);
This code is complete functional, but I really can not figure out, how to validate server's certificate against one concrete CA certificate that I have available in pem file.
All certificates are signed by my self-signed CA, and it is the CA I need to validate against (only against this one).
Every answer is appreciated.
EDIT:
In response to jglouie (thank you very much this way - can not vote up your answer).
I founded the solution:
new X509TrustManager() {
@Override
public java.security.cert.X509Certificate[] getAcceptedIssuers() {
return null;
}
@Override
public void checkClientTrusted(
java.security.cert.X509Certificate[] certs, String authType) {
}
@Override
public void checkServerTrusted(
java.security.cert.X509Certificate[] certs, String authType)
throws CertificateException {
InputStream inStream = null;
try {
// Loading the CA cert
URL u = getClass().getResource("tcp/cacert.pem");
inStream = new FileInputStream(u.getFile());
CertificateFactory cf = CertificateFactory.getInstance("X.509");
X509Certificate ca = (X509Certificate) cf.generateCertificate(inStream);
inStream.close();
for (X509Certificate cert : certs) {
// Verifing by public key
cert.verify(ca.getPublicKey());
}
} catch (Exception ex) {
Logger.getLogger(Client.class.getName()).log(Level.SEVERE, null, ex);
} finally {
try {
inStream.close();
} catch (IOException ex) {
Logger.getLogger(Client.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}
};
I assume that the self-signed certificate of your CA is already loaded as follows:
CertificateFactory cf = CertificateFactory.getInstance("X.509");
FileInputStream finStream = new FileInputStream("CACertificate.pem");
X509Certificate caCertificate = (X509Certificate)cf.generateCertificate(finStream);
Then in the method to check certificate:
@Override
public void checkServerTrusted(java.security.cert.X509Certificate[] certs, String authType) throws CertificateException {
if (certs == null || certs.length == 0) {
throw new IllegalArgumentException("null or zero-length certificate chain");
}
if (authType == null || authType.length() == 0) {
throw new IllegalArgumentException("null or zero-length authentication type");
}
//Check if certificate send is your CA's
if(!certs[0].equals(caCertificate)){
try
{ //Not your CA's. Check if it has been signed by your CA
certs[0].verify(caCertificate.getPublicKey())
}
catch(Exception e){
throw new CertificateException("Certificate not trusted",e);
}
}
//If we end here certificate is trusted. Check if it has expired.
try{
certs[0].checkValidity();
}
catch(Exception e){
throw new CertificateException("Certificate not trusted. It has expired",e);
}
}
Disclaimer: Have not even atempted to compile the code