Spring SAML - 如何在 SP HTTP 请求中添加自定义字段？

Question

我的服务提供商使用 HTTP-Post 绑定(bind)将请求发送到 IDP。我需要在表单中添加新字段。现在我正在发送“SAMLRequest”和“RelayState”，但我还需要发送“option”和“profile”，这些是我们的 IDP 所需的字段。如何使用 Spring Saml 安全性来实现这一点？

Answer 1

您可以在 Extensions 中包含其他字段SAML 的元素 AuthnRequest信息。为此，您需要重写类 WebSSOProfileImpl并在 securityContext.xml 中配置您的新实现类. Extensions可以像这样构造元素:

package example;

import org.opensaml.common.SAMLException;
import org.opensaml.saml2.common.Extensions;
import org.opensaml.saml2.common.impl.ExtensionsBuilder;
import org.opensaml.saml2.core.AuthnRequest;
import org.opensaml.saml2.metadata.AssertionConsumerService;
import org.opensaml.saml2.metadata.SingleSignOnService;
import org.opensaml.saml2.metadata.provider.MetadataProviderException;
import org.opensaml.xml.schema.XSAny;
import org.opensaml.xml.schema.impl.XSAnyBuilder;
import org.springframework.security.saml.context.SAMLMessageContext;
import org.springframework.security.saml.metadata.MetadataManager;
import org.springframework.security.saml.processor.SAMLProcessor;
import org.springframework.security.saml.websso.WebSSOProfileImpl;
import org.springframework.security.saml.websso.WebSSOProfileOptions;

/**
 * Customization of the AuthnRequest generation.
 */
public class WebSSOProfile extends WebSSOProfileImpl {

    public WebSSOProfile() {
    }

    public WebSSOProfile(SAMLProcessor processor, MetadataManager manager) {
        super(processor, manager);
    }

    @Override
    protected AuthnRequest getAuthnRequest(SAMLMessageContext context, WebSSOProfileOptions options, AssertionConsumerService assertionConsumer, SingleSignOnService bindingService) throws SAMLException, MetadataProviderException {
        AuthnRequest authnRequest = super.getAuthnRequest(context, options, assertionConsumer, bindingService);
        authnRequest.setExtensions(buildExtensions());
        return authnRequest;
    }

    protected Extensions buildExtensions() {

        XSAny extraElement = new XSAnyBuilder().buildObject("urn:myexample:extraAttribute", "ExtraElement", "myexample");
        extraElement.setTextContent("extraValue");

        Extensions extensions = new ExtensionsBuilder().buildObject();
        extensions.getUnknownXMLObjects().add(extraElement);

        return extensions;

    }

}