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/*-
* ============LICENSE_START=======================================================
* org.onap.dcaegen2.collectors.ves
* ================================================================================
* Copyright (C) 2019 Nokia. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.dcae.common.configuration;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.cert.X509Certificate;
import java.util.Arrays;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;
import org.onap.dcae.ApplicationSettings;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.filter.GenericFilterBean;
@Configuration
public class CustomFilter extends GenericFilterBean {
private static final String CERTIFICATE_X_509 = "javax.servlet.request.X509Certificate";
private static final String MESSAGE = "SubjectDN didn't match with any regexp from %s file like %s";
private ApplicationSettings properties;
public CustomFilter(ApplicationSettings properties) {
this.properties = properties;
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
FilterChain filterChain) throws IOException, ServletException {
X509Certificate[] cert = (X509Certificate[]) servletRequest.getAttribute(CERTIFICATE_X_509);
if (cert != null) {
if (getLines().anyMatch(element -> Pattern.compile(element).matcher(getSubjectDN(cert)).find())) {
filterChain.doFilter(servletRequest, servletResponse);
} else {
setResponse((HttpServletResponse) servletResponse);
}
} else {
filterChain.doFilter(servletRequest, servletResponse);
}
}
private void setResponse(HttpServletResponse servletResponse) throws IOException {
HttpServletResponse response = servletResponse;
response.sendError(HttpServletResponse.SC_FORBIDDEN,
String.format(MESSAGE, properties.certSubjectMatcher(), getLines().collect(Collectors.joining(" "))));
}
private Stream<String> getLines() throws IOException {
return Files.lines(Paths.get(properties.certSubjectMatcher()));
}
private String getSubjectDN(X509Certificate[] certs) {
return Arrays.stream(certs).map(e -> e.getSubjectDN().getName())
.map(x -> x.split(",")).flatMap(Arrays::stream)
.collect(Collectors.joining(","));
}
}
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