org.opensaml.saml2.binding.security.SAML2AuthnRequestsSignedRule Maven / Gradle / Ivy

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/*
 * Licensed to the University Corporation for Advanced Internet Development, 
 * Inc. (UCAID) under one or more contributor license agreements.  See the 
 * NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The UCAID licenses this file to You under the Apache 
 * License, Version 2.0 (the "License"); you may not use this file except in 
 * compliance with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.opensaml.saml2.binding.security;

import org.opensaml.common.SAMLObject;
import org.opensaml.common.SignableSAMLObject;
import org.opensaml.common.binding.SAMLMessageContext;
import org.opensaml.common.xml.SAMLConstants;
import org.opensaml.saml2.core.AuthnRequest;
import org.opensaml.saml2.metadata.SPSSODescriptor;
import org.opensaml.saml2.metadata.provider.MetadataProvider;
import org.opensaml.saml2.metadata.provider.MetadataProviderException;
import org.opensaml.ws.message.MessageContext;
import org.opensaml.ws.security.SecurityPolicyException;
import org.opensaml.ws.security.SecurityPolicyRule;
import org.opensaml.ws.transport.http.HTTPInTransport;
import org.opensaml.xml.util.DatatypeHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Security policy rule implementation that enforces the AuthnRequestsSigned flag of 
 * SAML 2 metadata element @{link {@link SPSSODescriptor}.
 */
public class SAML2AuthnRequestsSignedRule implements SecurityPolicyRule {
    
    /** Logger. */
    private final Logger log = LoggerFactory.getLogger(SAML2AuthnRequestsSignedRule.class);

    /** {@inheritDoc} */
    public void evaluate(MessageContext messageContext) throws SecurityPolicyException {
        if (!(messageContext instanceof SAMLMessageContext)) {
            log.debug("Invalid message context type, this policy rule only supports SAMLMessageContext");
            return;
        }
        SAMLMessageContext samlMsgCtx = (SAMLMessageContext) messageContext;
        
        SAMLObject samlMessage = samlMsgCtx.getInboundSAMLMessage();
        if (! (samlMessage instanceof AuthnRequest) ) {
            log.debug("Inbound message is not an instance of AuthnRequest, skipping evaluation...");
            return;
        }
        
        String messageIssuer = samlMsgCtx.getInboundMessageIssuer();
        if (DatatypeHelper.isEmpty(messageIssuer)) {
            log.warn("Inbound message issuer was empty, unable to evaluate rule");
            return;
        }
        
        MetadataProvider metadataProvider = samlMsgCtx.getMetadataProvider();
        if (metadataProvider == null) {
            log.warn("Message context did not contain a metadata provider, unable to evaluate rule");
            return;
        }
        
        SPSSODescriptor spssoRole;
        try {
            spssoRole = (SPSSODescriptor) metadataProvider
                .getRole(messageIssuer, SPSSODescriptor.DEFAULT_ELEMENT_NAME, SAMLConstants.SAML20P_NS);
        } catch (MetadataProviderException e) {
            log.warn("Error resolving SPSSODescriptor metadata for entityID '{}': {}", messageIssuer, e.getMessage());
            throw new SecurityPolicyException("Error resolving metadata for entity ID", e);
        }
        
        if (spssoRole == null) {
            log.warn("SPSSODescriptor role metadata for entityID '{}' could not be resolved", messageIssuer);
            return;
        }
        
        if (spssoRole.isAuthnRequestsSigned() == Boolean.TRUE) {
            if (! isMessageSigned(samlMsgCtx)) {
                log.error("SPSSODescriptor for entity ID '{}' indicates AuthnRequests must be signed, "
                        + "but inbound message was not signed", messageIssuer);
                throw new SecurityPolicyException("Inbound AuthnRequest was required to be signed but was not");
            }
        } else {
            log.debug("SPSSODescriptor for entity ID '{}' does not require AuthnRequests to be signed", messageIssuer);
        }

    }
    
    /**
     * Determine whether the inbound message is signed.
     * 
     * @param messageContext the message context being evaluated
     * @return true if the inbound message is signed, otherwise false
     */
    protected boolean isMessageSigned(SAMLMessageContext messageContext) {
        // TODO this really should be determined by the decoders and supplied to the rule
        // in some fashion, to handle binding-specific signature mechanisms. See JIRA issue JOWS-4.
        //
        // For now evaluate here inline for XML Signature and HTTP-Redirect and HTTP-Post-SimpleSign.
        
        SAMLObject samlMessage = messageContext.getInboundSAMLMessage();
        if (samlMessage instanceof SignableSAMLObject) {
            SignableSAMLObject signableMessage = (SignableSAMLObject) samlMessage;
            if (signableMessage.isSigned()) {
                return true;
            }
        }
        
        // This handles HTTP-Redirect and HTTP-POST-SimpleSign bindings.
        HTTPInTransport inTransport = (HTTPInTransport) messageContext.getInboundMessageTransport();
        String sigParam = inTransport.getParameterValue("Signature");
        return !DatatypeHelper.isEmpty(sigParam);
    }

}