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package sun.security.util;

import java.io.*;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.cert.X509Certificate;
import java.security.cert.CertificateException;
import java.util.Properties;

import jdk.internal.util.StaticProperty;
import sun.security.x509.X509CertImpl;

A utility class to check if a certificate is untrusted. This is an internal mechanism that explicitly marks a certificate as untrusted, normally in the case that a certificate is known to be used for malicious reasons. Attention: This check is NOT meant to replace the standard PKI-defined validation check, neither is it used as an alternative to CRL.
/** * A utility class to check if a certificate is untrusted. This is an internal * mechanism that explicitly marks a certificate as untrusted, normally in the * case that a certificate is known to be used for malicious reasons. * * <b>Attention</b>: This check is NOT meant to replace the standard PKI-defined * validation check, neither is it used as an alternative to CRL. */
public final class UntrustedCertificates { private static final Debug debug = Debug.getInstance("certpath"); private static final String ALGORITHM_KEY = "Algorithm"; private static final Properties props = new Properties(); private static final String algorithm; static { AccessController.doPrivileged(new PrivilegedAction<Void>() { @Override public Void run() { File f = new File(StaticProperty.javaHome(), "lib/security/blocked.certs"); try (FileInputStream fin = new FileInputStream(f)) { props.load(fin); } catch (IOException fnfe) { if (debug != null) { debug.println("Error parsing blocked.certs"); } } return null; } }); algorithm = props.getProperty(ALGORITHM_KEY); }
Checks if a certificate is untrusted.
Params:
  • cert – the certificate to check
Returns:true if the certificate is untrusted.
/** * Checks if a certificate is untrusted. * * @param cert the certificate to check * @return true if the certificate is untrusted. */
public static boolean isUntrusted(X509Certificate cert) { if (algorithm == null) { return false; } String key; if (cert instanceof X509CertImpl) { key = ((X509CertImpl)cert).getFingerprint(algorithm); } else { try { key = new X509CertImpl(cert.getEncoded()).getFingerprint(algorithm); } catch (CertificateException cee) { return false; } } return props.containsKey(key); } private UntrustedCertificates() {} }