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/*-
* ============LICENSE_START=======================================================
* org.onap.dcaegen2.collectors.ves
* ================================================================================
* Copyright (C) 2018 - 2019 Nokia. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.dcae.restapi;
import io.vavr.control.Option;
import java.io.IOException;
import java.security.cert.X509Certificate;
import java.util.Base64;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.onap.dcae.ApplicationSettings;
import org.onap.dcae.common.configuration.AuthMethodType;
import org.onap.dcae.common.configuration.SubjectMatcher;
import org.onap.dcaegen2.services.sdk.security.CryptPassword;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
@Component
public class ApiAuthInterceptor extends HandlerInterceptorAdapter {
private static final Logger LOG = LoggerFactory.getLogger(ApiAuthInterceptor.class);
private static final String CERTIFICATE_X_509 = "javax.servlet.request.X509Certificate";
private static final String MESSAGE = "SubjectDN didn't match with any regexp from %s";
private final CryptPassword cryptPassword = new CryptPassword();
private final ApplicationSettings settings;
private Logger errorLogger;
public ApiAuthInterceptor(ApplicationSettings applicationSettings, Logger errorLogger) {
this.settings = applicationSettings;
this.errorLogger = errorLogger;
}
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws IOException {
SubjectMatcher subjectMatcher = new SubjectMatcher(settings,(X509Certificate[]) request.getAttribute(CERTIFICATE_X_509));
if(!settings.authMethod().equalsIgnoreCase(AuthMethodType.NO_AUTH.value()) && request.getServerPort() == settings.httpPort() ){
if(request.getRequestURI().replaceAll("^/|/$", "").equalsIgnoreCase("healthcheck")){
return true;
}
response.getWriter().write("Operation not permitted");
response.setStatus(400);
return false;
}
if(settings.authMethod().equalsIgnoreCase(AuthMethodType.CERT_ONLY.value())){
return validateCertRequest(response, subjectMatcher);
}
if(isCertSubject(subjectMatcher)){
return true;
}
if (isBasicAuth() ) {
return validateBasicHeader(request, response);
}
return true;
}
private boolean validateBasicHeader(HttpServletRequest request, HttpServletResponse response)
throws IOException {
String authorizationHeader = request.getHeader("Authorization");
if (authorizationHeader == null || !isAuthorized(authorizationHeader)) {
response.setStatus(401);
errorLogger.error("EVENT_RECEIPT_FAILURE: Unauthorized user");
response.getWriter().write(ApiException.UNAUTHORIZED_USER.toJSON().toString());
return false;
}
LOG.info("Request is authorized by basic auth");
return true;
}
private boolean validateCertRequest(HttpServletResponse response, SubjectMatcher subjectMatcher)
throws IOException {
if (!isCertSubject(subjectMatcher)) {
response.setStatus(HttpServletResponse.SC_FORBIDDEN);
response.getWriter().write(String.format(MESSAGE, settings.certSubjectMatcher()));
return false;
}
LOG.info("Cert and subjectDN is valid");
return true;
}
private boolean isCertSubject(SubjectMatcher subjectMatcher) {
if(subjectMatcher.isCert() && subjectMatcher.match()){
LOG.info("Cert and subjectDN is valid");
return true;
}
LOG.info(String.format(MESSAGE, settings.certSubjectMatcher()));
return false;
}
private boolean isBasicAuth() {
return settings.authMethod().equalsIgnoreCase(AuthMethodType.BASIC_AUTH.value())
|| settings.authMethod().equalsIgnoreCase(AuthMethodType.CERT_BASIC_AUTH.value());
}
private boolean isAuthorized(String authorizationHeader) {
try {
String encodedData = authorizationHeader.split(" ")[1];
String decodedData = new String(Base64.getDecoder().decode(encodedData));
String providedUser = decodedData.split(":")[0].trim();
String providedPassword = decodedData.split(":")[1].trim();
Option<String> maybeSavedPassword = settings.validAuthorizationCredentials().get(providedUser);
boolean userRegistered = maybeSavedPassword.isDefined();
return userRegistered && cryptPassword.matches(providedPassword,maybeSavedPassword.get());
} catch (Exception e) {
LOG.warn(String.format("Could not check if user is authorized (header: '%s')), probably malformed header.",
authorizationHeader), e);
return false;
}
}
}
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