Question

我有一个简单的安全套接字服务器 - 客户端程序对于服务器证书，我使用keytool创建了一个密钥库当我尝试通过我的客户端连接到服务器时，我得到以下例外：
在服务器中：

Exception in thread "main" javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_unknown

在客户端：

Exception in thread "main" javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Unknown Source)

如果我的理解是正确的，那么这些例外是由于我使用我创建的证书这一事实引起的我的问题如下：
如果我在服务器和客户端中设置启用的密码套件，所有* _anon *密码套件，这不应该解决问题吗？
我的意思是如果我启用*_anon_*密码套件，则不需要进行身份验证，因此没有例外这是对的吗？因为我仍然有例外。我尝试在启用的密码套件中启用所有已启用的+ _anon密码套件。没有成功。我尝试只设置anon，并得到一个新的例外：

Exception in thread "main" java.lang.IllegalArgumentException: Name must not be null

有人可以用anon密码套件解释为什么我会得到这些例外吗？ 注意：
如果我在客户端上设置系统属性javax.net.ssl.trustStore指向我创建并由我的服务器使用的密钥库，则通信正常！
该程序无异常，数据从客户端发送到服务器。

更新
这是我用来启用匿名密码的片段（我已经为服务器和客户端部分做了这个）：

String[] supported = server.getSupportedCipherSuites();
String[] anonCipherSuitesSupported = new String[supported.length];
int count = 0;

for(int i = 0; i < supported.length; i++)
{
    if(supported[i].indexOf("_anon_") > 0)
    {
        anonCipherSuitesSupported[count++] = supported[i];
    }
}

String[] oldEnabled = server.getEnabledCipherSuites();
String[] newEnabled = new String[oldEnabled.length + count];
System.arraycopy(oldEnabled, 0, newEnabled, 0, oldEnabled.length);
System.arraycopy(anonCipherSuitesSupported, 0, newEnabled, oldEnabled.length, count);
server.setEnabledCipherSuites(newEnabled);

堆栈跟踪在客户端：

Exception in thread "main" javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Unknown Source)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(Unknown Source)
    at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Unknown Source)
    at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Unknown Source)
    at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(Unknown Source)
    at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(Unknown Source)
    at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Unknown Source)
    at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Unknown Source)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(Unknown Source)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRecord(Unknown Source)
    at com.sun.net.ssl.internal.ssl.AppOutputStream.write(Unknown Source)
    at sun.nio.cs.StreamEncoder.writeBytes(Unknown Source)
    at sun.nio.cs.StreamEncoder.implFlushBuffer(Unknown Source)
    at sun.nio.cs.StreamEncoder.implFlush(Unknown Source)
    at sun.nio.cs.StreamEncoder.flush(Unknown Source)
    at java.io.OutputStreamWriter.flush(Unknown Source)
    at com.client.SSLClient1.main(SSLClient1.java:58)
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at sun.security.validator.PKIXValidator.doBuild(Unknown Source)
    at sun.security.validator.PKIXValidator.engineValidate(Unknown Source)
    at sun.security.validator.Validator.validate(Unknown Source)
    at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.validate(Unknown Source)
    at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
    at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
    ... 14 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown Source)
    at java.security.cert.CertPathBuilder.build(Unknown Source)
    ... 20 more

并在服务器端：

Exception in thread "main" javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_unknown
    at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Unknown Source)
    at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Unknown Source)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.recvAlert(Unknown Source)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(Unknown Source)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readDataRecord(Unknown Source)
    at com.sun.net.ssl.internal.ssl.AppInputStream.read(Unknown Source)
    at com.sun.net.ssl.internal.ssl.AppInputStream.read(Unknown Source)
    at com.server.SecureOrderTaker.main(SecureOrderTaker.java:92)

现在，如果我只是这样做：

server.setEnabledCipherSuites(anonCipherSuitesSupported);

所以只启用了匿名密码套件我得到了：

Exception in thread "main" java.lang.IllegalArgumentException: Name must not be null
    at com.sun.net.ssl.internal.ssl.CipherSuite.valueOf(Unknown Source)
    at com.sun.net.ssl.internal.ssl.CipherSuiteList.<init>(Unknown Source)
    at com.sun.net.ssl.internal.ssl.SSLServerSocketImpl.setEnabledCipherSuites(Unknown Source)
    at com.server.SecureOrderTaker.main(SecureOrderTaker.java:82)

谢谢

Answer 1

您是对的，*_anon_*密码用于完整的未经身份验证的连接（服务器和客户端都是匿名的）。使用这些密码套件无需证书。我写了一个小代码来测试：

ServerSocketFactory sf = SSLServerSocketFactory.getDefault();
final SSLServerSocket socket = (SSLServerSocket)sf.createServerSocket(443);
System.out.println(Arrays.toString(socket.getSupportedCipherSuites()));
System.out.println(Arrays.toString(socket.getEnabledCipherSuites()));

socket.setEnabledCipherSuites(new String[] {"SSL_DH_anon_EXPORT_WITH_DES40_CBC_SHA"});

Thread t = new Thread() {
    public void run() {
        try {
            Socket client = socket.accept();
            client.getOutputStream().write("Hello World\n".getBytes("ASCII"));
            client.close();
        } catch (IOException ioe) {
        }
    }
};

t.start();
Thread.sleep(2000);
SSLSocket client = (SSLSocket) SSLSocketFactory.getDefault().createSocket("localhost", 443);
client.setEnabledCipherSuites(new String[] {"SSL_DH_anon_EXPORT_WITH_DES40_CBC_SHA"});
InputStream in = client.getInputStream();
byte[] data = new byte[1024];
int len = in.read(data);
System.out.println(new String(data, 0, len));

我知道这段代码并不完美但我在客户端和服务器之间成功交换数据。可能您的服务器或客户端套接字配置不正确。你能给出完整的堆栈跟踪吗？

请注意，这些密码已弃用，因为它们容易受到中间人攻击。

更新：我发现了这个问题。 anonCipherSuitesSupported数组长度太长。因此，在添加*_anon_*之后，数组以一堆null值结束。并且实现似乎不接受启用的密码列表中的null。

String[] supported = server.getSupportedCipherSuites();
List<String> list= new ArrayList<String>();

for(int i = 0; i < supported.length; i++)
{
    if(supported[i].indexOf("_anon_") > 0)
    {
        list.add(supported[i]);
    }
}
String[] anonCipherSuitesSupported = list.toArray(new String[0]);

Answer 2

您正在处理由您创建的证书，这意味着您是证书颁发机构。

你的问题是，为了双方握手和沟通，他们需要相互信任彼此的证书。通过构建从证书到CA的链来建立信任，以查看特定方是否信任该CA（一些额外的步骤，例如检查证书是否未被撤销也可能就位）。默认情况下，Java中大多数主要CA都是受信任的。在您的情况下，您的自定义CA不是。

这意味着您的服务器证书应该在您的客户端的信任存储区中（如您所述，指出它解决了问题）。那，或CA的证书（更好的选择）。

有关SSL / TLS的一般详情，请查看here。

如果您正在处理相互信任，那么您的服务器也应该信任颁发您的客户端证书的CA.

java安全套接字没有认证？

2 个答案: