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ErrorPageSecurityFilter.java
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ErrorPageSecurityFilter.java
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/*
* Copyright 2012-2021 the original author or authors.
*
* 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
*
* https://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.springframework.boot.web.servlet.filter;
import java.io.IOException;
import javax.servlet.DispatcherType;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.access.WebInvocationPrivilegeEvaluator;
/**
* {@link Filter} that intercepts error dispatches to ensure authorized access to the
* error page.
*
* @author Madhura Bhave
* @author Andy Wilkinson
* @since 2.6.0
*/
public class ErrorPageSecurityFilter implements Filter {
private static final WebInvocationPrivilegeEvaluator ALWAYS = new AlwaysAllowWebInvocationPrivilegeEvaluator();
private final ApplicationContext context;
private volatile WebInvocationPrivilegeEvaluator privilegeEvaluator;
public ErrorPageSecurityFilter(ApplicationContext context) {
this.context = context;
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// Intentionally blank
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
doFilter((HttpServletRequest) request, (HttpServletResponse) response, chain);
}
private void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
throws IOException, ServletException {
if (DispatcherType.ERROR.equals(request.getDispatcherType()) && !isAllowed(request)) {
sendError(request, response);
return;
}
chain.doFilter(request, response);
}
private boolean isAllowed(HttpServletRequest request) {
String uri = request.getRequestURI();
Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
return getPrivilegeEvaluator().isAllowed(uri, authentication);
}
private WebInvocationPrivilegeEvaluator getPrivilegeEvaluator() {
WebInvocationPrivilegeEvaluator privilegeEvaluator = this.privilegeEvaluator;
if (privilegeEvaluator == null) {
privilegeEvaluator = getPrivilegeEvaluatorBean();
this.privilegeEvaluator = privilegeEvaluator;
}
return privilegeEvaluator;
}
private WebInvocationPrivilegeEvaluator getPrivilegeEvaluatorBean() {
try {
return this.context.getBean(WebInvocationPrivilegeEvaluator.class);
}
catch (NoSuchBeanDefinitionException ex) {
return ALWAYS;
}
}
private void sendError(HttpServletRequest request, HttpServletResponse response) throws IOException {
Integer errorCode = (Integer) request.getAttribute(RequestDispatcher.ERROR_STATUS_CODE);
response.sendError((errorCode != null) ? errorCode : 401);
}
/**
* {@link WebInvocationPrivilegeEvaluator} that always allows access.
*/
private static class AlwaysAllowWebInvocationPrivilegeEvaluator implements WebInvocationPrivilegeEvaluator {
@Override
public boolean isAllowed(String uri, Authentication authentication) {
return true;
}
@Override
public boolean isAllowed(String contextPath, String uri, String method, Authentication authentication) {
return true;
}
}
}