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如何在Java中以编程方式检查SSL证书过期日期

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我需要从Java网站上的SSL证书中提取到期日期，应该同时支持可信和自签名证书，例如：1.trusted https://github.com 2.self-signed https://mms.nw.ru/

我已经将一些代码复制为：

import java.net.URL;
import java.security.SecureRandom;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.KeyManager;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

public class SSLTest {

    public static void main(String [] args) throws Exception {
        // configure the SSLContext with a TrustManager
        SSLContext ctx = SSLContext.getInstance("TLS");
        ctx.init(new KeyManager[0], new TrustManager[] {new DefaultTrustManager()}, new SecureRandom());
        SSLContext.setDefault(ctx);

        URL url = new URL("https://github.com");//https://mms.nw.ru
        HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
        conn.setHostnameVerifier(new HostnameVerifier() {
            @Override
            public boolean verify(String arg0, SSLSession arg1) {
                return true;
            }
        });
        System.out.println(conn.getResponseCode());
        Certificate[] certs = conn.getServerCertificates();
        for (Certificate cert :certs){
            System.out.println(cert.getType());
            System.out.println(cert);
        }

        conn.disconnect();
    }

    private static class DefaultTrustManager implements X509TrustManager {

        @Override
        public void checkClientTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {}

        @Override
        public void checkServerTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {}

        @Override
        public X509Certificate[] getAcceptedIssuers() {
            return null;
        }
    }
}

问题是：

  • 如何解析证书的过期日期，在我的代码中，toString（）确实输出了日期，但很难解析 .

  • 如何确定证书链，例如带链3的github证书，我如何知道从哪个证书中获取到期日期？

java ssl https httpclient ssl-certificate

3 回答

  • 22

    如何从证书中解析到期日期

    将其转换为 X509Certificate 并调用 getNotAfter() .

    如何确定证书链，例如带链的github证书

    你 Certificate[] 是 Certificate[] 数组是什么，正如它在Javadoc中所说的那样 .

    我如何知道从哪个证书中获取到期日期？

    阅读Javadoc . "The peer's own certificate first followed by any certificate authorities" .

    但是我不知道你为什么这么做 . Java应该已经为您完成了所有工作 .

    请丢掉那些不安全和不正确的TrustManager实现 . 处理自签名证书的正确方法是将它们导入客户端信任库 . 还请丢弃您不安全的HostnameVerifier，并使用默认的或安全的 . 如果您不希望它安全，为什么要使用HTTPS呢？

    回复于
  • 0

    在Kotlin方式，它应该看起来像这样：

    fun certInformation(aURL: String) {
    val destinationURL = URL(aURL)
    val conn = destinationURL.openConnection() as HttpsURLConnection
    conn.connect()
    val certs = conn.serverCertificates
    for (cert in certs) {
        println("Certificate is: $cert")
        if (cert is X509Certificate) {
            println(cert.issuerDN.name)
            println(cert.notAfter)
            println(cert.notBefore)
        }
    }
}
    回复于
  • -1

    确保将开始/结束行附加到PEM格式，否则java不理解它 .

    public class CertTest {

    public static final String cert = "-----BEGIN CERTIFICATE-----\n<CERT_DATA>\n-----END CERTIFICATE-----";

    public static void main(String[] args){
        try {
            X509Certificate myCert = (X509Certificate)CertificateFactory
                     .getInstance("X509")
                     .generateCertificate(
                                       // string encoded with default charset
                    new ByteArrayInputStream(cert.getBytes())
                     );
            System.out.println(myCert.getNotAfter());

        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
}
    回复于

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