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PowerAuth 2.0 RESTful API Security Additions for EJB
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/*
 * PowerAuth integration libraries for RESTful API applications, examples and
 * related software components
 *
 * Copyright (C) 2017 Lime - HighTech Solutions s.r.o.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 */
package io.getlime.security.powerauth.rest.api.jaxrs.provider;

import com.google.common.io.BaseEncoding;
import io.getlime.powerauth.soap.PowerAuthPortServiceStub;
import io.getlime.security.powerauth.crypto.lib.enums.PowerAuthSignatureTypes;
import io.getlime.security.powerauth.http.PowerAuthHttpBody;
import io.getlime.security.powerauth.http.PowerAuthHttpHeader;
import io.getlime.security.powerauth.rest.api.base.authentication.PowerAuthApiAuthentication;
import io.getlime.security.powerauth.rest.api.base.exception.PowerAuthAuthenticationException;
import io.getlime.security.powerauth.rest.api.base.provider.PowerAuthAuthenticationProviderBase;
import io.getlime.security.powerauth.rest.api.jaxrs.authentication.PowerAuthApiAuthenticationImpl;
import io.getlime.security.powerauth.rest.api.jaxrs.authentication.PowerAuthAuthenticationImpl;
import io.getlime.security.powerauth.soap.axis.client.PowerAuthServiceClient;

import javax.ejb.Stateless;
import javax.inject.Inject;
import java.rmi.RemoteException;
import java.util.List;
import java.util.Map;

/**
 * Implementation of PowerAuth authentication provider.
 *
 * @author Petr Dvorak
 *
 */
@Stateless
public class PowerAuthAuthenticationProvider extends PowerAuthAuthenticationProviderBase {

    @Inject
    private PowerAuthServiceClient powerAuthClient;

    public PowerAuthAuthenticationProvider() {
    }

    public PowerAuthApiAuthentication authenticate(PowerAuthAuthenticationImpl authentication) throws RemoteException {

        PowerAuthPortServiceStub.VerifySignatureRequest soapRequest = new PowerAuthPortServiceStub.VerifySignatureRequest();
        soapRequest.setActivationId(authentication.getActivationId());
        soapRequest.setApplicationKey(authentication.getApplicationKey());
        soapRequest.setSignature(authentication.getSignature());
        soapRequest.setSignatureType(authentication.getSignatureType());
        soapRequest.setData(PowerAuthHttpBody.getSignatureBaseString(
                authentication.getHttpMethod(),
                authentication.getRequestUri(),
                authentication.getNonce(),
                authentication.getData()
        ));

        PowerAuthPortServiceStub.VerifySignatureResponse soapResponse = powerAuthClient.verifySignature(soapRequest);

        if (soapResponse.getSignatureValid()) {
            PowerAuthApiAuthentication apiAuthentication = new PowerAuthApiAuthenticationImpl();
            apiAuthentication.setActivationId(soapResponse.getActivationId());
            apiAuthentication.setUserId(soapResponse.getUserId());
            return apiAuthentication;
        } else {
            return null;
        }
    }

    /**
     * Validate the signature from the PowerAuth 2.0 HTTP header against the provided HTTP method, request body and URI identifier.
     * Make sure to accept only allowed signatures.
     * @param httpMethod HTTP method (GET, POST, ...)
     * @param httpBody Body of the HTTP request.
     * @param requestUriIdentifier Request URI identifier.
     * @param httpAuthorizationHeader PowerAuth 2.0 HTTP authorization header.
     * @param allowedSignatureTypes Allowed types of the signature.
     * @return Instance of a PowerAuthApiAuthenticationImpl on successful authorization.
     * @throws PowerAuthAuthenticationException In case authorization fails, exception is raised.
     */
    public PowerAuthApiAuthentication validateRequestSignature(
            String httpMethod,
            byte[] httpBody,
            String requestUriIdentifier,
            String httpAuthorizationHeader,
            List allowedSignatureTypes
    ) throws PowerAuthAuthenticationException {

        // Check for HTTP PowerAuth signature header
        if (httpAuthorizationHeader == null || httpAuthorizationHeader.equals("undefined")) {
            throw new PowerAuthAuthenticationException("POWER_AUTH_SIGNATURE_INVALID_EMPTY");
        }

        // Parse HTTP header
        Map httpHeaderInfo = PowerAuthHttpHeader.parsePowerAuthSignatureHTTPHeader(httpAuthorizationHeader);

        // Check if the parsing was successful
        if (httpHeaderInfo == null) {
            throw new PowerAuthAuthenticationException("POWER_AUTH_SIGNATURE_INVALID_EMPTY");
        }

        // Fetch HTTP header attributes
        String activationId = httpHeaderInfo.get(PowerAuthHttpHeader.ACTIVATION_ID);
        if (activationId == null) {
            throw new PowerAuthAuthenticationException("POWER_AUTH_ACTIVATION_ID_EMPTY");
        }
        String nonce = httpHeaderInfo.get(PowerAuthHttpHeader.NONCE);
        if (nonce == null) {
            throw new PowerAuthAuthenticationException("POWER_AUTH_NONCE_EMPTY");
        }
        String signatureType = httpHeaderInfo.get(PowerAuthHttpHeader.SIGNATURE_TYPE);
        if (signatureType == null) {
            throw new PowerAuthAuthenticationException("POWER_AUTH_SIGNATURE_TYPE_EMPTY");
        }
        String signature = httpHeaderInfo.get(PowerAuthHttpHeader.SIGNATURE);
        if (signature == null) {
            throw new PowerAuthAuthenticationException("POWER_AUTH_SIGNATURE_EMPTY");
        }
        String applicationId = httpHeaderInfo.get(PowerAuthHttpHeader.APPLICATION_ID);
        if (applicationId == null) {
            throw new PowerAuthAuthenticationException("POWER_AUTH_APPLICATION_EMPTY");
        }

        // Check if the signature type is allowed
        PowerAuthSignatureTypes expectedSignatureType = PowerAuthSignatureTypes.getEnumFromString(signatureType);
        if (!allowedSignatureTypes.contains(expectedSignatureType)) {
            throw new PowerAuthAuthenticationException("POWER_AUTH_SIGNATURE_TYPE_INVALID");
        }

        // Configure PowerAuth authentication object
        PowerAuthAuthenticationImpl powerAuthAuthentication = new PowerAuthAuthenticationImpl();
        powerAuthAuthentication.setActivationId(activationId);
        powerAuthAuthentication.setApplicationKey(applicationId);
        powerAuthAuthentication.setNonce(BaseEncoding.base64().decode(nonce));
        powerAuthAuthentication.setSignatureType(signatureType);
        powerAuthAuthentication.setSignature(signature);
        powerAuthAuthentication.setHttpMethod(httpMethod);
        powerAuthAuthentication.setRequestUri(requestUriIdentifier);
        powerAuthAuthentication.setData(httpBody);

        // Call the authentication
        PowerAuthApiAuthentication auth = null;
        try {
            auth = this.authenticate(powerAuthAuthentication);
        } catch (RemoteException e) {
            throw new PowerAuthAuthenticationException("POWER_AUTH_SIGNATURE_SOAP_ERROR");
        }

        // In case authentication is null, throw PowerAuth exception
        if (auth == null) {
            throw new PowerAuthAuthenticationException("POWER_AUTH_SIGNATURE_INVALID_VALUE");
        }

        return auth;
    }

}