org.springframework.security.web.authentication.www.BasicAuthenticationFilter Maven / Gradle / Ivy
/*
* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
*
* 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.springframework.security.web.authentication.www;
import java.io.IOException;
import java.util.Base64;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.security.authentication.AnonymousAuthenticationToken;
import org.springframework.security.authentication.AuthenticationDetailsSource;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.AuthenticationEntryPoint;
import org.springframework.security.web.authentication.NullRememberMeServices;
import org.springframework.security.web.authentication.RememberMeServices;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.util.Assert;
import org.springframework.web.filter.OncePerRequestFilter;
/**
* Processes a HTTP request's BASIC authorization headers, putting the result into the
* SecurityContextHolder.
*
*
* For a detailed background on what this filter is designed to process, refer to
* RFC 1945, Section 11.1. Any realm
* name presented in the HTTP request is ignored.
*
*
* In summary, this filter is responsible for processing any request that has a HTTP
* request header of Authorization with an authentication scheme of
* Basic and a Base64-encoded username:password token. For
* example, to authenticate user "Aladdin" with password "open sesame" the following
* header would be presented:
*
*
*
* Authorization: Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==
*
*
*
* This filter can be used to provide BASIC authentication services to both remoting
* protocol clients (such as Hessian and SOAP) as well as standard user agents (such as
* Internet Explorer and Netscape).
*
* If authentication is successful, the resulting {@link Authentication} object will be
* placed into the SecurityContextHolder.
*
*
* If authentication fails and ignoreFailure is false (the
* default), an {@link AuthenticationEntryPoint} implementation is called (unless the
* ignoreFailure property is set to true). Usually this should be
* {@link BasicAuthenticationEntryPoint}, which will prompt the user to authenticate again
* via BASIC authentication.
*
*
* Basic authentication is an attractive protocol because it is simple and widely
* deployed. However, it still transmits a password in clear text and as such is
* undesirable in many situations. Digest authentication is also provided by Spring
* Security and should be used instead of Basic authentication wherever possible. See
* {@link org.springframework.security.web.authentication.www.DigestAuthenticationFilter}.
*
* Note that if a {@link RememberMeServices} is set, this filter will automatically send
* back remember-me details to the client. Therefore, subsequent requests will not need to
* present a BASIC authentication header as they will be authenticated using the
* remember-me mechanism.
*
* @author Ben Alex
*/
public class BasicAuthenticationFilter extends OncePerRequestFilter {
// ~ Instance fields
// ================================================================================================
private AuthenticationDetailsSource authenticationDetailsSource = new WebAuthenticationDetailsSource();
private AuthenticationEntryPoint authenticationEntryPoint;
private AuthenticationManager authenticationManager;
private RememberMeServices rememberMeServices = new NullRememberMeServices();
private boolean ignoreFailure = false;
private String credentialsCharset = "UTF-8";
/**
* Creates an instance which will authenticate against the supplied
* {@code AuthenticationManager} and which will ignore failed authentication attempts,
* allowing the request to proceed down the filter chain.
*
* @param authenticationManager the bean to submit authentication requests to
*/
public BasicAuthenticationFilter(AuthenticationManager authenticationManager) {
Assert.notNull(authenticationManager, "authenticationManager cannot be null");
this.authenticationManager = authenticationManager;
this.ignoreFailure = true;
}
/**
* Creates an instance which will authenticate against the supplied
* {@code AuthenticationManager} and use the supplied {@code AuthenticationEntryPoint}
* to handle authentication failures.
*
* @param authenticationManager the bean to submit authentication requests to
* @param authenticationEntryPoint will be invoked when authentication fails.
* Typically an instance of {@link BasicAuthenticationEntryPoint}.
*/
public BasicAuthenticationFilter(AuthenticationManager authenticationManager,
AuthenticationEntryPoint authenticationEntryPoint) {
Assert.notNull(authenticationManager, "authenticationManager cannot be null");
Assert.notNull(authenticationEntryPoint,
"authenticationEntryPoint cannot be null");
this.authenticationManager = authenticationManager;
this.authenticationEntryPoint = authenticationEntryPoint;
}
// ~ Methods
// ========================================================================================================
@Override
public void afterPropertiesSet() {
Assert.notNull(this.authenticationManager,
"An AuthenticationManager is required");
if (!isIgnoreFailure()) {
Assert.notNull(this.authenticationEntryPoint,
"An AuthenticationEntryPoint is required");
}
}
@Override
protected void doFilterInternal(HttpServletRequest request,
HttpServletResponse response, FilterChain chain)
throws IOException, ServletException {
final boolean debug = this.logger.isDebugEnabled();
String header = request.getHeader("Authorization");
if (header == null || !header.toLowerCase().startsWith("basic ")) {
chain.doFilter(request, response);
return;
}
try {
String[] tokens = extractAndDecodeHeader(header, request);
assert tokens.length == 2;
String username = tokens[0];
if (debug) {
this.logger
.debug("Basic Authentication Authorization header found for user '"
+ username + "'");
}
if (authenticationIsRequired(username)) {
UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken(
username, tokens[1]);
authRequest.setDetails(
this.authenticationDetailsSource.buildDetails(request));
Authentication authResult = this.authenticationManager
.authenticate(authRequest);
if (debug) {
this.logger.debug("Authentication success: " + authResult);
}
SecurityContextHolder.getContext().setAuthentication(authResult);
this.rememberMeServices.loginSuccess(request, response, authResult);
onSuccessfulAuthentication(request, response, authResult);
}
}
catch (AuthenticationException failed) {
SecurityContextHolder.clearContext();
if (debug) {
this.logger.debug("Authentication request for failed: " + failed);
}
this.rememberMeServices.loginFail(request, response);
onUnsuccessfulAuthentication(request, response, failed);
if (this.ignoreFailure) {
chain.doFilter(request, response);
}
else {
this.authenticationEntryPoint.commence(request, response, failed);
}
return;
}
chain.doFilter(request, response);
}
/**
* Decodes the header into a username and password.
*
* @throws BadCredentialsException if the Basic header is not present or is not valid
* Base64
*/
private String[] extractAndDecodeHeader(String header, HttpServletRequest request)
throws IOException {
byte[] base64Token = header.substring(6).getBytes("UTF-8");
byte[] decoded;
try {
decoded = Base64.getDecoder().decode(base64Token);
}
catch (IllegalArgumentException e) {
throw new BadCredentialsException(
"Failed to decode basic authentication token");
}
String token = new String(decoded, getCredentialsCharset(request));
int delim = token.indexOf(":");
if (delim == -1) {
throw new BadCredentialsException("Invalid basic authentication token");
}
return new String[] { token.substring(0, delim), token.substring(delim + 1) };
}
private boolean authenticationIsRequired(String username) {
// Only reauthenticate if username doesn't match SecurityContextHolder and user
// isn't authenticated
// (see SEC-53)
Authentication existingAuth = SecurityContextHolder.getContext()
.getAuthentication();
if (existingAuth == null || !existingAuth.isAuthenticated()) {
return true;
}
// Limit username comparison to providers which use usernames (ie
// UsernamePasswordAuthenticationToken)
// (see SEC-348)
if (existingAuth instanceof UsernamePasswordAuthenticationToken
&& !existingAuth.getName().equals(username)) {
return true;
}
// Handle unusual condition where an AnonymousAuthenticationToken is already
// present
// This shouldn't happen very often, as BasicProcessingFitler is meant to be
// earlier in the filter
// chain than AnonymousAuthenticationFilter. Nevertheless, presence of both an
// AnonymousAuthenticationToken
// together with a BASIC authentication request header should indicate
// reauthentication using the
// BASIC protocol is desirable. This behaviour is also consistent with that
// provided by form and digest,
// both of which force re-authentication if the respective header is detected (and
// in doing so replace
// any existing AnonymousAuthenticationToken). See SEC-610.
if (existingAuth instanceof AnonymousAuthenticationToken) {
return true;
}
return false;
}
protected void onSuccessfulAuthentication(HttpServletRequest request,
HttpServletResponse response, Authentication authResult) throws IOException {
}
protected void onUnsuccessfulAuthentication(HttpServletRequest request,
HttpServletResponse response, AuthenticationException failed)
throws IOException {
}
protected AuthenticationEntryPoint getAuthenticationEntryPoint() {
return this.authenticationEntryPoint;
}
protected AuthenticationManager getAuthenticationManager() {
return this.authenticationManager;
}
protected boolean isIgnoreFailure() {
return this.ignoreFailure;
}
public void setAuthenticationDetailsSource(
AuthenticationDetailsSource authenticationDetailsSource) {
Assert.notNull(authenticationDetailsSource,
"AuthenticationDetailsSource required");
this.authenticationDetailsSource = authenticationDetailsSource;
}
public void setRememberMeServices(RememberMeServices rememberMeServices) {
Assert.notNull(rememberMeServices, "rememberMeServices cannot be null");
this.rememberMeServices = rememberMeServices;
}
public void setCredentialsCharset(String credentialsCharset) {
Assert.hasText(credentialsCharset, "credentialsCharset cannot be null or empty");
this.credentialsCharset = credentialsCharset;
}
protected String getCredentialsCharset(HttpServletRequest httpRequest) {
return this.credentialsCharset;
}
}