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/*******************************************************************************
* ============LICENSE_START====================================================
* * org.onap.aai
* * ===========================================================================
* * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* * Copyright © 2017 Amdocs
* * ===========================================================================
* * 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====================================================
* *
* * ECOMP is a trademark and service mark of AT&T Intellectual Property.
* *
******************************************************************************/
package com.att.cadi.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.att.cadi.Access;
import com.att.cadi.Access.Level;
import com.att.cadi.config.Config;
/**
* PathFilter
*
* This class implements Servlet Filter, and uses AAF to validate access to a Path.
*
* This class can be used in a standard J2EE Servlet manner.
*
*
*/
public class PathFilter implements Filter {
private ServletContext context;
private String aaf_type;
private String not_authorized_msg;
private final Log log;
/**
* Construct a viable Filter for installing in Container WEB.XML, etc.
*
*/
public PathFilter() {
log = new Log() {
public void info(String ... msg) {
context.log(build("INFO:",msg));
}
public void audit(String ... msg) {
context.log(build("AUDIT:",msg));
}
private String build(String type, String []msg) {
StringBuilder sb = new StringBuilder(type);
for(String s : msg) {
sb.append(' ');
sb.append(s);
}
return sb.toString();
}
};
}
/**
* Filter that can be constructed within Java
* @param access
*/
public PathFilter(final Access access) {
log = new Log() {
public void info(String ... msg) {
access.log(Level.INFO, (Object[])msg);
}
public void audit(String ... msg) {
access.log(Level.AUDIT, (Object[])msg);
}
};
}
/**
* Init
*
* Standard Filter "init" call with FilterConfig to obtain properties. POJOs can construct a
* FilterConfig with the mechanism of their choice, and standard J2EE Servlet engines utilize this
* mechanism already.
*/
public void init(FilterConfig filterConfig) throws ServletException {
// need the Context for Logging, instantiating ClassLoader, etc
context = filterConfig.getServletContext();
StringBuilder sb = new StringBuilder();
StringBuilder err = new StringBuilder();
Object attr = context.getAttribute(Config.PATHFILTER_NS);
if(attr==null) {
err.append("PathFilter - pathfilter_ns is not set");
} else {
sb.append(attr.toString());
}
attr = context.getAttribute(Config.PATHFILTER_STACK);
if(attr==null) {
log.info("PathFilter - No pathfilter_stack set, ignoring");
} else {
sb.append('.');
sb.append(attr.toString());
}
attr = context.getAttribute(Config.PATHFILTER_URLPATTERN);
if(attr==null) {
log.info("PathFilter - No pathfilter_urlpattern set, defaulting to 'urlpattern'");
sb.append(".urlpattern");
} else {
sb.append('.');
sb.append(attr.toString());
}
log.info("PathFilter - AAF Permission Type is",sb.toString());
sb.append('|');
aaf_type = sb.toString();
attr = context.getAttribute(Config.PATHFILTER_NOT_AUTHORIZED_MSG);
if(attr==null) {
not_authorized_msg = "Forbidden - Not Authorized to access this Path";
} else {
not_authorized_msg = attr.toString();
}
if(err.length()>0) {
throw new ServletException(err.toString());
}
}
private interface Log {
public void info(String ... msg);
public void audit(String ... msg);
}
/**
* doFilter
*
* This is the standard J2EE invocation. Analyze the request, modify response as necessary, and
* only call the next item in the filterChain if request is suitably Authenticated.
*/
//TODO Always validate changes against Tomcat AbsCadiValve and Jaspi CadiSAM functions
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest hreq = (HttpServletRequest)request;
HttpServletResponse hresp = (HttpServletResponse)response;
String perm = aaf_type+hreq.getPathInfo()+'|'+hreq.getMethod();
if(hreq.isUserInRole(perm)) {
chain.doFilter(request, response);
} else {
log.audit("PathFilter has denied",hreq.getUserPrincipal().getName(),"access to",perm);
hresp.sendError(403,not_authorized_msg);
}
}
/**
* Containers call "destroy" when time to cleanup
*/
public void destroy() {
log.info("PathFilter destroyed.");
}
}
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