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package org.apache.catalina.authenticator;
import org.apache.catalina.HttpRequest;
import org.apache.catalina.HttpResponse;
import org.apache.catalina.deploy.LoginConfig;
import org.apache.catalina.util.Base64;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.nio.charset.Charset;
import java.security.Principal;
import java.util.Locale;
import java.util.logging.Level;
/**
* An Authenticator and Valve implementation of HTTP BASIC
* Authentication, as outlined in RFC 2617: "HTTP Authentication: Basic
* and Digest Access Authentication."
*
* @author Craig R. McClanahan
* @version $Revision: 1.7 $ $Date: 2007/05/05 05:31:52 $
*/
public class BasicAuthenticator
extends AuthenticatorBase {
// --------------------------------------------------- Instance Variables
/**
* Descriptive information about this implementation.
*/
protected static final String info =
"org.apache.catalina.authenticator.BasicAuthenticator/1.0";
// ----------------------------------------------------------- Properties
/**
* Return descriptive information about this Valve implementation.
*/
@Override
public String getInfo() {
return (this.info);
}
// ------------------------------------------------------- Public Methods
/**
* Authenticate the user making this request, based on the specified
* login configuration. Return true if any specified
* constraint has been satisfied, or false if we have
* created a response challenge already.
*
* @param request Request we are processing
* @param response Response we are creating
* @param config Login configuration describing how authentication
* should be performed
*
* @exception IOException if an input/output error occurs
*/
@Override
public boolean authenticate(HttpRequest request,
HttpResponse response,
LoginConfig config)
throws IOException {
// Have we already authenticated someone?
Principal principal =
((HttpServletRequest) request.getRequest()).getUserPrincipal();
if (principal != null) {
if (log.isLoggable(Level.FINE))
log.log(Level.FINE, "Already authenticated '" + principal.getName() + "'");
return (true);
}
// Validate any credentials already included with this request
HttpServletResponse hres =
(HttpServletResponse) response.getResponse();
String authorization = request.getAuthorization();
/* IASRI 4868073
String username = parseUsername(authorization);
String password = parsePassword(authorization);
principal = context.getRealm().authenticate(username, password);
if (principal != null) {
register(request, response, principal, Constants.BASIC_METHOD,
username, password);
return (true);
}
*/
// BEGIN IASRI 4868073
// Only attempt to parse and validate the authorization if one was
// sent by the client. No reason to attempt to login with null
// authorization which must fail anyway. With basic auth this
// scenario always occurs first so this is a common case. This
// will also prevent logging the audit message for failure to
// authenticate null user (since login failures are always logged
// per psarc req).
if (authorization != null) {
String username = parseUsername(authorization);
char[] password = parsePassword(authorization);
principal = context.getRealm().authenticate(username, password);
if (principal != null) {
register(request, response, principal, Constants.BASIC_METHOD,
username, password);
String ssoId = (String) request.getNote(
Constants.REQ_SSOID_NOTE);
if (ssoId != null) {
getSession(request, true);
}
return (true);
}
}
// END IASRI 4868073
// Send an "unauthorized" response and an appropriate challenge
String realmName = config.getRealmName();
if (realmName == null)
realmName = REALM_NAME;
// if (debug >= 1)
// log("Challenging for realm '" + realmName + "'");
hres.setHeader(AUTH_HEADER_NAME,
"Basic realm=\"" + realmName + "\"");
hres.sendError(HttpServletResponse.SC_UNAUTHORIZED);
// hres.flushBuffer();
return (false);
}
// ------------------------------------------------------ Protected Methods
/**
* Parse the username from the specified authorization credentials.
* If none can be found, return null.
*
* @param authorization Authorization credentials from this request
*/
protected String parseUsername(String authorization) {
if (authorization == null)
return (null);
if (!authorization.toLowerCase(Locale.ENGLISH).startsWith("basic "))
return (null);
authorization = authorization.substring(6).trim();
// Decode and parse the authorization credentials
String unencoded =
new String(Base64.decode(authorization.getBytes(Charset.defaultCharset())));
int colon = unencoded.indexOf(':');
if (colon < 0)
return (null);
String username = unencoded.substring(0, colon);
// String password = unencoded.substring(colon + 1).trim();
return (username);
}
/**
* Parse the password from the specified authorization credentials.
* If none can be found, return null.
*
* @param authorization Authorization credentials from this request
*/
protected char[] parsePassword(String authorization) {
if (authorization == null)
return (null);
if (!authorization.toLowerCase(Locale.ENGLISH).startsWith("basic "))
return (null);
authorization = authorization.substring(6).trim();
// Decode and parse the authorization credentials
String unencoded =
new String(Base64.decode(authorization.getBytes(Charset.defaultCharset())));
int colon = unencoded.indexOf(':');
if (colon < 0)
return (null);
// String username = unencoded.substring(0, colon).trim();
char[] password = unencoded.substring(colon + 1).toCharArray();
return (password);
}
@Override
protected String getAuthMethod() {
return HttpServletRequest.BASIC_AUTH;
}
}
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