消费SAMLResponse令牌。

Question

消费SAMLResponse令牌。

javaauthenticationsamlopensamlsaml-2.0

11

SAML基于服务提供商（SP）的身份验证具有以下简短工作流程：

用户想要访问SP上的应用程序。
SP向IDP发送SAMLRequest令牌。
IDP接受并生成SAMLResponse令牌。
IDP将此SAMLResponse令牌发送到SP给出的AC-URL。

我的问题是SP如何使用此SAMLResponse令牌。逻辑是什么？如果我能得到一些JAVA代码帮助，那将是有益的。

- Muhammad Imran Tariq

3个回答

2

这是我在Java中的做法。我使用XMLBeans来解析SAMLResponse，然后解密它（如果它被加密了），最后验证签名： WebBrowserSSOAuthConsumerService

- codebrane

1

要求提供代码有些过分，但基本处理是SP验证SAMLResponse，包括格式是否正确、必需值是否存在、协议是否正确以及任何其他SP特定的验证（时间限制、数据对应等），将令牌中标识的用户映射到SP上的用户（可能涉及创建用户），并将用户传输到请求的资源。

- JST

1

谢谢您的帮助。我会仔细检查所有这些内容。请问您能否给我一些关于涉及所有这些操作的类的提示，或者除了opensaml之外的任何网站都可以提供帮助。 - Muhammad Imran Tariq

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- Gaucho · Accepted Answer

下面这个方法对我有用：

以下是需要翻译的内容：

Get the SAMLResponse token and decode it and inflate:

// Base64 decode
Base64 base64Decoder = new Base64();
byte[] xmlBytes = encodedXmlString.getBytes("UTF-8");
byte[] base64DecodedByteArray = base64Decoder.decode(xmlBytes);

// Inflate (uncompress) the AuthnRequest data
// First attempt to unzip the byte array according to DEFLATE (rfc 1951)

Inflater inflater = new Inflater(true);
inflater.setInput(base64DecodedByteArray);
// since we are decompressing, it's impossible to know how much space we
// might need; hopefully this number is suitably big
byte[] xmlMessageBytes = new byte[5000];
int resultLength = inflater.inflate(xmlMessageBytes);

if (!inflater.finished()) {
    throw new RuntimeException("didn't allocate enough space to hold "
            + "decompressed data");
}

inflater.end();

String decodedResponse = new String(xmlMessageBytes, 0, resultLength,
        "UTF-8");

return decodedResponse;

Parse the resulting XML. Here you can get the info that you need and for example, create a POJO with it (this is a sample code for parsing LogoutRequest's but would be analogous for responses):

// Parse the XML. SAX approach, we just need the ID attribute
SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();

// If we want to validate the doc we need to load the DTD
// saxParserFactory.setValidating(true);

// Get a SAXParser instance
SAXParser saxParser = saxParserFactory.newSAXParser();

// Parse it
XMLhandler xmLhandler = new XMLhandler();
saxParser.parse(new ByteArrayInputStream(xmlLogoutRequest.getBytes()),
        xmLhandler);

// Return the SamlVO
return xmLhandler.getSamlVO();

对于我的使用情况，我只关心几个元素，因此我正在使用 SAX：

public class XMLhandler extends DefaultHandler {

    private SamlVO samlVO;

    public XMLhandler() {
        samlVO = new SamlVO();
    }

    @Override
    public void startElement(String uri, String localName, String qName,
        Attributes attributes) throws SAXException {

        // Managing a LogoutRequest means that we are going to build a LogoutResponse
        if (qName.equals("samlp:LogoutRequest")) {
            // The ID value of a request will be the LogoutResponse's InReponseTo attribute 
            samlVO.setInResponseTo(attributes.getValue("ID"));
            // From the destination we can get the Issuer element
            String destination = attributes.getValue("Destination");
            if (destination != null) {
                URL destinationUrl = null;
                try {
                    destinationUrl = new URL(destination);
                } catch (MalformedURLException e) {
                     // TODO: We could set the server hostname (take it from a property), but this URL SHOULD be well formed!
                     e.printStackTrace();
                }
                samlVO.setIssuer(destinationUrl.getHost());
            }
        }   
    }

    public SamlVO getSamlVO() {
        return samlVO;
    }

}

希望这可以帮到你，

Luis

附注：你也可以使用类似OpenSAML的库。

DefaultBootstrap.bootstrap();

HTTPRedirectDeflateDecoder decode = new HTTPRedirectDeflateDecoder(new BasicParserPool());
BasicSAMLMessageContext<LogoutRequest, ?, ?> messageContext = new BasicSAMLMessageContext<LogoutRequest, SAMLObject, SAMLObject>();
messageContext.setInboundMessageTransport(new HttpServletRequestAdapter(request));
decode.decode(messageContext);
XMLObjectBuilderFactory builderFactory = org.opensaml.Configuration.getBuilderFactory();
LogoutRequestBuilder logoutRequestBuilder = (LogoutRequestBuilder) builderFactory.getBuilder(LogoutRequest.DEFAULT_ELEMENT_NAME);
LogoutRequest logoutRequest = logoutRequestBuilder.buildObject();
logoutRequest = (LogoutRequest) messageContext.getInboundMessage();

但是准备好在你的CLASSPATH中包含一些库！！！