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Java APIs to validate and request VOMS attribute certificates
/**
* Copyright (c) Istituto Nazionale di Fisica Nucleare, 2006-2014.
*
* Licensed 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.italiangrid.voms.request.impl;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.x509.AttributeCertificate;
import org.italiangrid.voms.VOMSError;
import org.italiangrid.voms.request.VOMSACRequest;
import org.italiangrid.voms.request.VOMSACService;
import org.italiangrid.voms.request.VOMSESLookupStrategy;
import org.italiangrid.voms.request.VOMSProtocol;
import org.italiangrid.voms.request.VOMSProtocolError;
import org.italiangrid.voms.request.VOMSProtocolListener;
import org.italiangrid.voms.request.VOMSRequestListener;
import org.italiangrid.voms.request.VOMSResponse;
import org.italiangrid.voms.request.VOMSServerInfo;
import org.italiangrid.voms.request.VOMSServerInfoStore;
import org.italiangrid.voms.request.VOMSServerInfoStoreListener;
import org.italiangrid.voms.util.NullListener;
import eu.emi.security.authn.x509.X509CertChainValidatorExt;
import eu.emi.security.authn.x509.X509Credential;
/**
* The default implementation of the {@link VOMSACService}.
*
*
* @author Valerio Venturi
* @author Andrea Ceccanti
*
*/
public class DefaultVOMSACService implements VOMSACService {
/**
* The listener that will be informed about request events
*/
protected VOMSRequestListener requestListener;
/**
* The listener that will be informed about low-level protocol details
*/
protected VOMSProtocolListener protocolListener;
/**
* The validator used for the SSL handshake
*/
protected X509CertChainValidatorExt validator;
/**
* The store used to keep VOMS server contact information.
*/
protected VOMSServerInfoStore serverInfoStore;
/**
* The http protocol implementation
*/
protected VOMSProtocol httpProtocol;
/**
* The voms legacy protocol implementation
*/
protected VOMSProtocol legacyProtocol;
/**
* Constructor which builds a {@link DefaultVOMSACService} from a
* {@link Builder}
*
* @param builder
* the builder object that provides the settings for this
* {@link VOMSACService}
*/
protected DefaultVOMSACService(Builder builder) {
this.validator = builder.validator;
this.requestListener = builder.requestListener;
this.protocolListener = builder.protocolListener;
this.serverInfoStore = builder.serverInfoStore;
this.httpProtocol = builder.httpProtocol;
this.legacyProtocol = builder.legacyProtocol;
}
/**
* Extracts an AC from a VOMS response
*
* @param request
* the request
* @param response
* the received response
* @return a possibly null {@link AttributeCertificate} object
*/
protected AttributeCertificate getACFromResponse(VOMSACRequest request,
VOMSResponse response) {
byte[] acBytes = response.getAC();
if (acBytes == null)
return null;
ASN1InputStream asn1InputStream = new ASN1InputStream(acBytes);
AttributeCertificate attributeCertificate = null;
try {
attributeCertificate = AttributeCertificate.getInstance(asn1InputStream
.readObject());
asn1InputStream.close();
return attributeCertificate;
} catch (Throwable e) {
requestListener.notifyVOMSRequestFailure(request, null, new VOMSError(
"Error unmarshalling VOMS AC. Cause: " + e.getMessage(), e));
return null;
}
}
private VOMSResponse doRequest(VOMSProtocol protocol,
VOMSServerInfo endpoint, X509Credential cred, VOMSACRequest req) {
VOMSResponse response = null;
try {
response = protocol.doRequest(endpoint, cred, req);
} catch (VOMSProtocolError e) {
requestListener.notifyVOMSRequestFailure(req, endpoint, e);
}
return response;
}
/**
* Handles errors included in the VOMS response
*
* @param request
* the request
* @param si
* the VOMS server endpoint information
* @param response
* the received {@link VOMSResponse}
*/
protected void handleErrorsInResponse(VOMSACRequest request,
VOMSServerInfo si, VOMSResponse response) {
if (response.hasErrors())
requestListener.notifyErrorsInVOMSReponse(request, si,
response.errorMessages());
}
/**
* Handles warnings included in the VOMS response
*
* @param request
* the request
* @param si
* the VOMS server endpoint information
* @param response
* the received {@link VOMSResponse}
*/
protected void handleWarningsInResponse(VOMSACRequest request,
VOMSServerInfo si, VOMSResponse response) {
if (response.hasWarnings())
requestListener.notifyWarningsInVOMSResponse(request, si,
response.warningMessages());
}
public AttributeCertificate getVOMSAttributeCertificate(
X509Credential credential, VOMSACRequest request) {
List vomsServerInfos = getVOMSServerInfos(request);
if (vomsServerInfos.isEmpty())
throw new VOMSError("VOMS server for VO " + request.getVoName() + " "
+ "is not known! Check your vomses configuration.");
VOMSResponse response = null;
AttributeCertificate vomsAC = null;
for (VOMSServerInfo vomsServerInfo : vomsServerInfos) {
requestListener.notifyVOMSRequestStart(request, vomsServerInfo);
// Try HTTP request first
response = doRequest(httpProtocol, vomsServerInfo, credential, request);
// If failed, try legacy request
if (response == null) {
response = doRequest(legacyProtocol, vomsServerInfo, credential,
request);
}
// We had failures with both requests
if (response == null) {
requestListener.notifyVOMSRequestFailure(request, vomsServerInfo,
new VOMSError("REST and legacy VOMS endpoints failed."));
// continue to next server
continue;
}
// Notify that the server was contacted successfully
requestListener.notifyVOMSRequestSuccess(request, vomsServerInfo);
// Notify errors
handleErrorsInResponse(request, vomsServerInfo, response);
// Notify warnings
handleWarningsInResponse(request, vomsServerInfo, response);
vomsAC = getACFromResponse(request, response);
// Exit the loop only when succesfully get an AC
// out of the VOMS server
if (!response.hasErrors() && vomsAC != null) {
return vomsAC;
}
}
// if we reach this point we had failures in contacting
// all known voms server for the VO
requestListener.notifyVOMSRequestFailure(request, null, null);
return null;
}
/**
* Get VOMS server endpoint information that matches with the
* {@link VOMSACRequest} passed as argument.
*
* This method returns a random shuffle of the {@link VOMSServerInfo} objects
* that match the input request.
*
* @param request
* the request
* @return a possibly empty {@link List} of {@link VOMSServerInfo} objects
*/
protected List getVOMSServerInfos(VOMSACRequest request) {
List vomsServerInfos = new ArrayList(
serverInfoStore.getVOMSServerInfo(request.getVoName()));
if (!vomsServerInfos.isEmpty()) {
Collections.shuffle(vomsServerInfos);
}
return vomsServerInfos;
}
/**
* Creates a {@link DefaultVOMSACService} object. The
* {@link DefaultVOMSACService} parameters can be set with the appropriate
* methods. Example:
*
*
*
*
*
*
*
*
*
*
*
*
* {
* @code
* VOMSACService acService = new DefaultVOMSACService.Builder(certChainValidator)
* .requestListener(requestListener)
* .serverInfoStoreListener(serverInfoStoreListener)
* .protocolListener(protocolListener).build();
* }
*
*
*
*/
public static class Builder {
/**
* The listener that will be informed about request events
*/
private VOMSRequestListener requestListener = NullListener.INSTANCE;
/**
* The listener that will be informed about low-level protocol details
*/
private VOMSProtocolListener protocolListener = NullListener.INSTANCE;
/**
* The listener that will be informed about server info store events
*/
private VOMSServerInfoStoreListener storeListener = NullListener.INSTANCE;
/**
* The validator used for the SSL handshake
*/
private X509CertChainValidatorExt validator;
/**
* The store used to keep VOMS server contact information.
*/
private VOMSServerInfoStore serverInfoStore;
/**
* The provided strategy to lookup vomses information.
*/
private VOMSESLookupStrategy vomsesLookupStrategy;
/**
* A list of paths where vomses information will be looked for, used to
* create the server info store.
*/
private List vomsesLocations;
/**
* The connect timeout value
*/
private int connectTimeout = AbstractVOMSProtocol.DEFAULT_CONNECT_TIMEOUT;
/**
* The read timeout used
*/
private int readTimeout = AbstractVOMSProtocol.DEFAULT_READ_TIMEOUT;
/**
* Whether the client should skip hostname checking
*/
private boolean skipHostnameChecks = true;
/**
* The http protocol implementation
*/
protected VOMSProtocol httpProtocol;
/**
* The voms legacy protocol implementation
*/
protected VOMSProtocol legacyProtocol;
/**
* Creates a Builder for a {@link DefaultVOMSACService}.
*
* @param certChainValidator
* the validator to use to setup the SSL connection and validate
* the certificates
*/
public Builder(X509CertChainValidatorExt certChainValidator) {
if (certChainValidator == null)
throw new NullPointerException(
"Please provide a non-null certificate chain validator");
this.validator = certChainValidator;
}
/**
* Sets the request listener for the {@link DefaultVOMSACService} that this
* builder is creating
*
* @param l
* the request listener that will receive notifications about
* request events
* @return this {@link Builder} instance
*/
public Builder requestListener(VOMSRequestListener l) {
this.requestListener = l;
return this;
}
/**
* Sets the {@link VOMSServerInfoStoreListener} for the
* {@link DefaultVOMSACService} that this builder is creating
*
* @param sl
* the store listener that will receive notifications about store
* events
* @return this {@link Builder} instance
*/
public Builder serverInfoStoreListener(VOMSServerInfoStoreListener sl) {
this.storeListener = sl;
return this;
}
/**
* Sets the {@link VOMSServerInfoStore} for the {@link DefaultVOMSACService}
* that this builder is creating
*
* @param sis
* a {@link VOMSServerInfoStore} object
* @return this {@link Builder} instance
*/
public Builder serverInfoStore(VOMSServerInfoStore sis) {
this.serverInfoStore = sis;
return this;
}
/**
* Sets the {@link VOMSProtocolListener} for the
* {@link DefaultVOMSACService} that this builder is creating
*
* @param pl
* the {@link VOMSProtocolListener} that will receive notifications
* about protocol events
* @return this {@link Builder} instance
*/
public Builder protocolListener(VOMSProtocolListener pl) {
this.protocolListener = pl;
return this;
}
/**
* Sets the connect timeout (in millisecods) for the
* {@link DefaultVOMSACService} that this builder is creating
*
* @param timeout
* the timeout value in milliseconds
* @return this {@link Builder} instance
*/
public Builder connectTimeout(int timeout) {
this.connectTimeout = timeout;
return this;
}
/**
* Sets the read timeout (in milliseconds) for the
* {@link DefaultVOMSACService} that this builder is creating
*
* @param timeout
* the timeout value in milliseconds
* @return this {@link Builder} instance
*/
public Builder readTimeout(int timeout) {
this.readTimeout = timeout;
return this;
}
/**
* Sets a flag to skip VOMS hostname checking. Allows for creative VOMS
* server side certificate configuration.
*
* @param s
* true to skip the checks, false
* otherwise
*
* @return this {@link Builder} instance
*/
public Builder skipHostnameChecks(boolean s) {
this.skipHostnameChecks = s;
return this;
}
/**
* Sets the vomses lookup strategy for the {@link DefaultVOMSACService} that
* this builder is creating
*
* @param strategy
* the {@link VOMSESLookupStrategy} object
* @return this {@link Builder} instance
*/
public Builder vomsesLookupStrategy(VOMSESLookupStrategy strategy) {
this.vomsesLookupStrategy = strategy;
return this;
}
/**
* Sets a list of locations that will be used to build a
* {@link VOMSESLookupStrategy} for the {@link DefaultVOMSACService} that
* this builder is creating
*
* @param vomsesLocations
* a list of paths where vomses information will be looked for
* @return this {@link Builder} instance
*/
public Builder vomsesLocations(List vomsesLocations) {
this.vomsesLocations = vomsesLocations;
return this;
}
/**
* Sets the http protocol implementation
*
* @param httpProtocol
* the http protocol implementatino
* @return this {@link Builder} instance
*/
public Builder httpProtocol(VOMSProtocol httpProtocol) {
this.httpProtocol = httpProtocol;
return this;
}
/**
* Sets the legacy protocol implementation
*
* @param legacyProtocol
* the legacy protocol implementation
*
* @return
* the {@link Builder}
*/
public Builder legacyProtocol(VOMSProtocol legacyProtocol) {
this.legacyProtocol = legacyProtocol;
return this;
}
/**
* Builds the server info store
*/
protected void buildServerInfoStore() {
if (serverInfoStore != null)
return;
serverInfoStore = new DefaultVOMSServerInfoStore.Builder()
.lookupStrategy(vomsesLookupStrategy).storeListener(storeListener)
.vomsesPaths(vomsesLocations).build();
}
/**
* Builds default protocols if needed
*/
protected void buildProtocols() {
if (httpProtocol == null) {
RESTProtocol p = new RESTProtocol(validator, protocolListener,
connectTimeout, readTimeout);
p.setSkipHostnameChecks(skipHostnameChecks);
httpProtocol = p;
}
if (legacyProtocol == null) {
LegacyProtocol p = new LegacyProtocol(validator, protocolListener,
connectTimeout, readTimeout);
p.setSkipHostnameChecks(skipHostnameChecks);
legacyProtocol = p;
}
}
/**
* Builds the {@link DefaultVOMSACService}
*
* @return a {@link DefaultVOMSACService} configured as required by this
* builder
*/
public DefaultVOMSACService build() {
buildServerInfoStore();
buildProtocols();
return new DefaultVOMSACService(this);
}
}
}
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