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/*-
* ============LICENSE_START==========================================
* ONAP Portal
* ===================================================================
* Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* ===================================================================
*
* Unless otherwise specified, all software contained herein is licensed
* under the Apache License, Version 2.0 (the "License");
* you may not use this software 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.
*
* Unless otherwise specified, all documentation contained herein is licensed
* under the Creative Commons License, Attribution 4.0 Intl. (the "License");
* you may not use this documentation except in compliance with the License.
* You may obtain a copy of the License at
*
* https://creativecommons.org/licenses/by/4.0/
*
* Unless required by applicable law or agreed to in writing, documentation
* 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============================================
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
*/
package org.onap.portalapp.filter;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.FilterChain;
import javax.servlet.ReadListener;
import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.http.HttpStatus;
import org.onap.portalapp.util.SecurityXssValidator;
import org.onap.portalsdk.core.logging.logic.EELFLoggerDelegate;
import org.springframework.web.filter.OncePerRequestFilter;
public class SecurityXssFilter extends OncePerRequestFilter {
private EELFLoggerDelegate logger = EELFLoggerDelegate.getLogger(SecurityXssFilter.class);
private static final String APPLICATION_JSON = "application/json";
private static final String ERROR_BAD_REQUEST = "{\"error\":\"BAD_REQUEST\"}";
private SecurityXssValidator validator = SecurityXssValidator.getInstance();
public class RequestWrapper extends HttpServletRequestWrapper {
private ByteArrayOutputStream cachedBytes;
private Map parameter = new HashMap();
@SuppressWarnings("unchecked")
public RequestWrapper(HttpServletRequest request) {
super(request);
Enumeration<String> parameterNames = request.getParameterNames();
while (parameterNames.hasMoreElements()) {
String paramName = parameterNames.nextElement();
String paramValue = request.getParameter(paramName);
parameter.put(paramName,paramValue);
}
}
@Override
public String getParameter(String name) {
if (parameter != null) {
return (String) parameter.get(name);
}
return null;
}
@Override
public ServletInputStream getInputStream() throws IOException {
if (cachedBytes == null)
cacheInputStream();
return new CachedServletInputStream();
}
@Override
public BufferedReader getReader() throws IOException {
return new BufferedReader(new InputStreamReader(getInputStream()));
}
private void cacheInputStream() throws IOException {
cachedBytes = new ByteArrayOutputStream();
IOUtils.copy(super.getInputStream(), cachedBytes);
}
public class CachedServletInputStream extends ServletInputStream {
private ByteArrayInputStream input;
public CachedServletInputStream() {
input = new ByteArrayInputStream(cachedBytes.toByteArray());
}
@Override
public int read() throws IOException {
return input.read();
}
public boolean isFinished() {
return false;
}
public boolean isReady() {
return false;
}
public void setReadListener(ReadListener readListener) {
}
}
}
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
throws ServletException, IOException {
if (validateRequestType(request)) {
request = new RequestWrapper(request);
String requestData = IOUtils.toString(request.getInputStream(), StandardCharsets.UTF_8.toString());
try {
if (StringUtils.isNotBlank(requestData) && validator.denyXSS(requestData)) {
response.setContentType(APPLICATION_JSON);
response.setStatus(HttpStatus.SC_BAD_REQUEST);
response.getWriter().write(ERROR_BAD_REQUEST);
throw new SecurityException(ERROR_BAD_REQUEST);
}
} catch (Exception e) {
logger.error(EELFLoggerDelegate.errorLogger, "doFilterInternal() failed due to BAD_REQUEST", e);
response.getWriter().close();
return;
}
filterChain.doFilter(request, response);
} else {
filterChain.doFilter(request, response);
}
}
private boolean validateRequestType(HttpServletRequest request) {
return (request.getMethod().equalsIgnoreCase("POST") || request.getMethod().equalsIgnoreCase("PUT")
|| request.getMethod().equalsIgnoreCase("DELETE"));
}
}
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