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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() {}
}