如何在 Java 中获取受信任的根证书列表？

Question

我希望能够在 Java 应用程序中以编程方式访问所有受信任的根证书。

我正在查看密钥库接口，但我希望获得 JRE 隐含的受信任根列表。

这在任何地方都可以访问吗？

原文由 Shawn D. 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

有一个示例展示了如何获取一组根证书并遍历它们，称为 Listing the Most-Trusted Certificate Authorities (CA) in a Key Store 。这是打印出每个证书的稍微修改的版本（在 Windows Vista 上测试）。

 import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.InvalidAlgorithmParameterException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.PKIXParameters;
import java.security.cert.TrustAnchor;
import java.security.cert.X509Certificate;
import java.util.Iterator;

public class Main {

    public static void main(String[] args) {
        try {
            // Load the JDK's cacerts keystore file
            String filename = System.getProperty("java.home") + "/lib/security/cacerts".replace('/', File.separatorChar);
            FileInputStream is = new FileInputStream(filename);
            KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
            String password = "changeit";
            keystore.load(is, password.toCharArray());

            // This class retrieves the most-trusted CAs from the keystore
            PKIXParameters params = new PKIXParameters(keystore);

            // Get the set of trust anchors, which contain the most-trusted CA certificates
            Iterator it = params.getTrustAnchors().iterator();
            while( it.hasNext() ) {
                TrustAnchor ta = (TrustAnchor)it.next();
                // Get certificate
                X509Certificate cert = ta.getTrustedCert();
                System.out.println(cert);
            }
        } catch (CertificateException e) {
        } catch (KeyStoreException e) {
        } catch (NoSuchAlgorithmException e) {
        } catch (InvalidAlgorithmParameterException e) {
        } catch (IOException e) {
        }
    }
}

原文由 Bill the Lizard 发布，翻译遵循 CC BY-SA 3.0 许可协议

Answer 2

这应该更灵活地使用系统中的默认信任库来获取所有证书：

 TrustManagerFactory trustManagerFactory =
   TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
List<Certificate> x509Certificates = new ArrayList<>();
trustManagerFactory.init((KeyStore)null);
Arrays.asList(trustManagerFactory.getTrustManagers()).stream().forEach(t -> {
                    x509Certificates.addAll(Arrays.asList(((X509TrustManager)t).getAcceptedIssuers()));
                });

```

原文由 ko 发布，翻译遵循 CC BY-SA 3.0 许可协议