/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.cxf.rs.security.oauth2.grants.saml;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.Principal;
import java.security.cert.Certificate;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
import javax.ws.rs.core.MultivaluedMap;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.apache.cxf.common.util.Base64Exception;
import org.apache.cxf.jaxrs.utils.HttpUtils;
import org.apache.cxf.message.Message;
import org.apache.cxf.message.MessageUtils;
import org.apache.cxf.phase.PhaseInterceptorChain;
import org.apache.cxf.rs.security.common.CryptoLoader;
import org.apache.cxf.rs.security.common.SecurityUtils;
import org.apache.cxf.rs.security.oauth2.common.Client;
import org.apache.cxf.rs.security.oauth2.common.ServerAccessToken;
import org.apache.cxf.rs.security.oauth2.common.UserSubject;
import org.apache.cxf.rs.security.oauth2.grants.AbstractGrantHandler;
import org.apache.cxf.rs.security.oauth2.provider.OAuthServiceException;
import org.apache.cxf.rs.security.oauth2.saml.Constants;
import org.apache.cxf.rs.security.oauth2.saml.SamlOAuthValidator;
import org.apache.cxf.rs.security.oauth2.utils.Base64UrlUtility;
import org.apache.cxf.rs.security.oauth2.utils.OAuthConstants;
import org.apache.cxf.rs.security.oauth2.utils.OAuthUtils;
import org.apache.cxf.rs.security.saml.authorization.JAXRSSAMLSecurityContext;
import org.apache.cxf.rs.security.saml.authorization.SecurityContextProvider;
import org.apache.cxf.rs.security.saml.authorization.SecurityContextProviderImpl;
import org.apache.cxf.security.SecurityContext;
import org.apache.cxf.security.transport.TLSSessionInfo;
import org.apache.cxf.staxutils.StaxUtils;
import org.apache.cxf.ws.security.SecurityConstants;
import org.apache.wss4j.common.saml.SAMLKeyInfo;
import org.apache.wss4j.common.saml.SAMLUtil;
import org.apache.wss4j.common.saml.SamlAssertionWrapper;
import org.apache.wss4j.dom.WSSConfig;
import org.apache.wss4j.dom.handler.RequestData;
import org.apache.wss4j.dom.handler.WSHandlerConstants;
import org.apache.wss4j.dom.validate.Credential;
import org.apache.wss4j.dom.validate.SamlAssertionValidator;
import org.apache.wss4j.dom.validate.Validator;
import org.opensaml.xml.signature.KeyInfo;
import org.opensaml.xml.signature.Signature;
/**
* The "SAML2 Bearer" grant handler
*/
public class Saml2BearerGrantHandler extends AbstractGrantHandler {
private static final String ENCODED_SAML2_BEARER_GRANT;
static {
WSSConfig.init();
// AccessTokenService may be configured with the form provider
// which will not decode by default - so listing both the actual
// and encoded grant type value will help
ENCODED_SAML2_BEARER_GRANT = HttpUtils.urlEncode(Constants.SAML2_BEARER_GRANT, "UTF-8");
}
private Validator samlValidator = new SamlAssertionValidator();
private SamlOAuthValidator samlOAuthValidator = new SamlOAuthValidator();
private SecurityContextProvider scProvider = new SecurityContextProviderImpl();
public Saml2BearerGrantHandler() {
super(Arrays.asList(Constants.SAML2_BEARER_GRANT, ENCODED_SAML2_BEARER_GRANT));
}
public void setSamlValidator(Validator validator) {
samlValidator = validator;
}
public void setSamlOAuthValidator(SamlOAuthValidator validator) {
samlOAuthValidator = validator;
}
public void setSecurityContextProvider(SecurityContextProvider p) {
scProvider = p;
}
public ServerAccessToken createAccessToken(Client client, MultivaluedMap<String, String> params)
throws OAuthServiceException {
String assertion = params.getFirst(Constants.CLIENT_GRANT_ASSERTION_PARAM);
if (assertion == null) {
throw new OAuthServiceException(OAuthConstants.INVALID_GRANT);
}
try {
InputStream tokenStream = decodeAssertion(assertion);
Element token = readToken(tokenStream);
SamlAssertionWrapper assertionWrapper = new SamlAssertionWrapper(token);
Message message = PhaseInterceptorChain.getCurrentMessage();
validateToken(message, assertionWrapper);
UserSubject grantSubject = getGrantSubject(message, assertionWrapper);
return doCreateAccessToken(client,
grantSubject,
Constants.SAML2_BEARER_GRANT,
OAuthUtils.parseScope(params.getFirst(OAuthConstants.SCOPE)));
} catch (OAuthServiceException ex) {
throw ex;
} catch (Exception ex) {
throw new OAuthServiceException(OAuthConstants.INVALID_GRANT, ex);
}
}
protected UserSubject getGrantSubject(Message message, SamlAssertionWrapper wrapper) {
SecurityContext sc = scProvider.getSecurityContext(message, wrapper);
if (sc instanceof JAXRSSAMLSecurityContext) {
JAXRSSAMLSecurityContext jaxrsSc = (JAXRSSAMLSecurityContext)sc;
Set<Principal> rolesP = jaxrsSc.getUserRoles();
List<String> roles = new ArrayList<String>();
if (roles != null) {
for (Principal p : rolesP) {
roles.add(p.getName());
}
}
return new SamlUserSubject(jaxrsSc.getUserPrincipal().getName(),
roles,
jaxrsSc.getClaims());
} else {
return new UserSubject(sc.getUserPrincipal().getName());
}
}
private InputStream decodeAssertion(String assertion) {
try {
byte[] deflatedToken = Base64UrlUtility.decode(assertion);
return new ByteArrayInputStream(deflatedToken);
} catch (Base64Exception ex) {
throw new OAuthServiceException(OAuthConstants.INVALID_GRANT);
}
}
protected Element readToken(InputStream tokenStream) {
try {
Document doc = StaxUtils.read(new InputStreamReader(tokenStream, "UTF-8"));
return doc.getDocumentElement();
} catch (Exception ex) {
throw new OAuthServiceException(OAuthConstants.INVALID_GRANT);
}
}
protected void validateToken(Message message, SamlAssertionWrapper assertion) {
try {
RequestData data = new RequestData();
if (assertion.isSigned()) {
WSSConfig cfg = WSSConfig.getNewInstance();
data.setWssConfig(cfg);
data.setCallbackHandler(SecurityUtils.getCallbackHandler(message, this.getClass()));
try {
data.setSigVerCrypto(new CryptoLoader().getCrypto(message,
SecurityConstants.SIGNATURE_CRYPTO,
SecurityConstants.SIGNATURE_PROPERTIES));
} catch (IOException ex) {
throw new OAuthServiceException(OAuthConstants.INVALID_GRANT);
}
data.setEnableRevocation(MessageUtils.isTrue(
message.getContextualProperty(WSHandlerConstants.ENABLE_REVOCATION)));
Signature sig = assertion.getSignature();
KeyInfo keyInfo = sig.getKeyInfo();
SAMLKeyInfo samlKeyInfo =
SAMLUtil.getCredentialDirectlyFromKeyInfo(
keyInfo.getDOM(), data.getSigVerCrypto()
);
assertion.verifySignature(samlKeyInfo);
} else if (getTLSCertificates(message) == null) {
throw new OAuthServiceException(OAuthConstants.INVALID_GRANT);
}
if (samlValidator != null) {
Credential credential = new Credential();
credential.setSamlAssertion(assertion);
samlValidator.validate(credential, data);
}
samlOAuthValidator.validate(message, assertion);
} catch (Exception ex) {
throw new OAuthServiceException(OAuthConstants.INVALID_GRANT, ex);
}
}
private Certificate[] getTLSCertificates(Message message) {
TLSSessionInfo tlsInfo = message.get(TLSSessionInfo.class);
return tlsInfo != null ? tlsInfo.getPeerCertificates() : null;
}
protected void setSecurityContext(Message message, SamlAssertionWrapper wrapper) {
if (scProvider != null) {
SecurityContext sc = scProvider.getSecurityContext(message, wrapper);
message.put(SecurityContext.class, sc);
}
}
}