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// Portions Copyright [2018-2021] [Payara Foundation and/or its affiliates]
package org.apache.catalina.authenticator;

import static java.text.MessageFormat.format;
import static jakarta.servlet.http.HttpServletRequest.CLIENT_CERT_AUTH;
import static jakarta.servlet.http.HttpServletResponse.SC_BAD_REQUEST;
import static jakarta.servlet.http.HttpServletResponse.SC_UNAUTHORIZED;
import static org.apache.catalina.Globals.CERTIFICATES_ATTR;
import static org.apache.catalina.Globals.SSL_CERTIFICATE_ATTR;
import static org.apache.catalina.LogFacade.CANNOT_AUTHENTICATE_WITH_CREDENTIALS;
import static org.apache.catalina.LogFacade.LOOK_UP_CERTIFICATE_INFO;
import static org.apache.catalina.LogFacade.NO_CERTIFICATE_INCLUDED_INFO;
import static org.apache.catalina.LogFacade.NO_CLIENT_CERTIFICATE_CHAIN;
import static org.apache.catalina.LogFacade.PRINCIPAL_BEEN_AUTHENTICATED_INFO;
import static org.apache.catalina.authenticator.Constants.CERT_METHOD;
import static org.apache.catalina.authenticator.Constants.REQ_SSOID_NOTE;

import java.io.IOException;
import java.security.Principal;
import java.security.cert.X509Certificate;

import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import org.apache.catalina.HttpRequest;
import org.apache.catalina.HttpResponse;
import org.apache.catalina.deploy.LoginConfig;

/**
 * An Authenticator and Valve implementation of authentication that utilizes SSL certificates to identify
 * client users.
 *
 * @author Craig R. McClanahan
 * @version $Revision: 1.4 $ $Date: 2007/04/17 21:33:22 $
 */
public class SSLAuthenticator extends AuthenticatorBase {

    // ------------------------------------------------------------- Properties

    /**
     * Descriptive information about this implementation.
     */
    protected static final String info = "org.apache.catalina.authenticator.SSLAuthenticator/1.0";
 

    // --------------------------------------------------------- Public Methods

    /**
     * Authenticate the user by checking for the existence of a certificate chain, and optionally asking a trust manager to
     * validate that we trust this user.
     *
     * @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 (debug >= 1) {
                log(format(rb.getString(PRINCIPAL_BEEN_AUTHENTICATED_INFO), principal.getName()));
            }
            return true;
        }

        // Retrieve the certificate chain for this client
        HttpServletResponse httpServletResponse = (HttpServletResponse) response.getResponse();
        if (debug >= 1) {
            log(rb.getString(LOOK_UP_CERTIFICATE_INFO));
        }

        X509Certificate certs[] = (X509Certificate[]) request.getRequest().getAttribute(CERTIFICATES_ATTR);
        if (certs == null || certs.length < 1) {
            certs = (X509Certificate[]) request.getRequest().getAttribute(SSL_CERTIFICATE_ATTR);
        }
        
        if (certs == null || certs.length < 1) {
            if (debug >= 1) {
                log(rb.getString(NO_CERTIFICATE_INCLUDED_INFO));
            }
            
            httpServletResponse.sendError(SC_BAD_REQUEST);
            response.setDetailMessage(rb.getString(NO_CLIENT_CERTIFICATE_CHAIN));
            return false;
        }

        // Authenticate the specified certificate chain
        principal = context.getRealm().authenticate(certs);
        
        if (principal == null) {
            if (debug >= 1) {
                log("Realm.authenticate() returned false");
            }
            
            httpServletResponse.sendError(SC_UNAUTHORIZED);
            response.setDetailMessage(rb.getString(CANNOT_AUTHENTICATE_WITH_CREDENTIALS));
            return false;
        }

        // Cache the principal (if requested) and record this authentication
        register(request, response, principal, CERT_METHOD, null, null);
        
        String ssoId = (String) request.getNote(REQ_SSOID_NOTE);
        if (ssoId != null) {
            getSession(request, true);
        }

        return true;
    }
    
    /**
     * Return descriptive information about this Valve implementation.
     */
    @Override
    public String getInfo() {
        return SSLAuthenticator.info;
    }

    @Override
    protected String getAuthMethod() {
        return CLIENT_CERT_AUTH;
    }
}




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