validate oauth token and permission

components/webapp-authenticator-framework/org.wso2.carbon.webapp.authenticator.framework/pom.xml

@@ -86,6 +86,7 @@
                             org.wso2.carbon.utils,
                             org.wso2.carbon.utils.multitenancy,
                             org.xml.sax,
+                            com.google.gson.*,
                             javax.servlet,
                             javax.servlet.http,
                             javax.xml,
@@ -215,6 +216,10 @@
             <groupId>org.wso2.carbon.devicemgt</groupId>
             <artifactId>org.wso2.carbon.device.mgt.common</artifactId>
         </dependency>
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.wso2.orbit.org.apache.httpcomponents</groupId>
             <artifactId>httpclient</artifactId>

components/webapp-authenticator-framework/org.wso2.carbon.webapp.authenticator.framework/src/main/java/org/wso2/carbon/webapp/authenticator/framework/AuthenticationFrameworkUtil.java

@@ -22,6 +22,13 @@ import org.apache.catalina.connector.Response;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.w3c.dom.Document;
+import org.wso2.carbon.base.MultitenantConstants;
+import org.wso2.carbon.context.PrivilegedCarbonContext;
+import org.wso2.carbon.user.api.UserRealm;
+import org.wso2.carbon.user.api.UserStoreException;
+import org.wso2.carbon.user.core.service.RealmService;
+import org.wso2.carbon.utils.multitenancy.MultitenantUtils;
+import org.wso2.carbon.webapp.authenticator.framework.internal.AuthenticatorFrameworkDataHolder;
 
 import javax.xml.XMLConstants;
 import javax.xml.parsers.DocumentBuilder;
@@ -32,6 +39,7 @@ import java.io.IOException;
 public class AuthenticationFrameworkUtil {
 
     private static final Log log = LogFactory.getLog(AuthenticationFrameworkUtil.class);
+    private static final String UI_EXECUTE = "ui.execute";
 
     static void handleResponse(Request request, Response response, int statusCode, String payload) {
         response.setStatus(statusCode);
@@ -65,4 +73,43 @@ public class AuthenticationFrameworkUtil {
         }
     }
 
+    static boolean isUserAuthorized(int tenantId, String tenantDomain, String username, String
+            permission) throws
+            AuthenticationException {
+        boolean tenantFlowStarted = false;
+
+        try{
+            //If this is a tenant user
+            if(tenantId != MultitenantConstants.SUPER_TENANT_ID){
+                PrivilegedCarbonContext.startTenantFlow();
+                PrivilegedCarbonContext.getThreadLocalCarbonContext().setTenantDomain(tenantDomain);
+                PrivilegedCarbonContext.getThreadLocalCarbonContext().setTenantId(tenantId);
+                PrivilegedCarbonContext.getThreadLocalCarbonContext().setUsername(username);
+                tenantFlowStarted = true;
+            }
+
+            RealmService realmService = AuthenticatorFrameworkDataHolder.getInstance().getRealmService();
+            if (realmService == null) {
+                String msg = "RealmService is not initialized";
+                log.error(msg);
+                throw new AuthenticationException(msg);
+            }
+            UserRealm userRealm = realmService.getTenantUserRealm(tenantId);
+
+            return userRealm.getAuthorizationManager()
+                    .isUserAuthorized(MultitenantUtils
+                            .getTenantAwareUsername(username), permission, UI_EXECUTE);
+
+        } catch (UserStoreException e) {
+            String msg = "Error while getting username";
+            log.error(msg, e);
+            throw new AuthenticationException(msg, e);
+        }
+        finally {
+            if (tenantFlowStarted) {
+                PrivilegedCarbonContext.endTenantFlow();
+            }
+        }
+    }
+
 }

components/webapp-authenticator-framework/org.wso2.carbon.webapp.authenticator.framework/src/main/java/org/wso2/carbon/webapp/authenticator/framework/WebappAuthenticationValve.java

@@ -18,9 +18,11 @@
  */
 package org.wso2.carbon.webapp.authenticator.framework;
 
+import com.google.gson.Gson;
 import org.apache.catalina.Context;
 import org.apache.catalina.connector.Request;
 import org.apache.catalina.connector.Response;
+import org.apache.commons.lang.StringUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.owasp.encoder.Encode;
@@ -42,6 +44,8 @@ public class WebappAuthenticationValve extends CarbonTomcatValve {
 
     private static final Log log = LogFactory.getLog(WebappAuthenticationValve.class);
     private static TreeMap<String, String> nonSecuredEndpoints = new TreeMap<>();
+    private static final String PERMISSION_PREFIX = "/permission/admin";
+    public static final String AUTHORIZE_PERMISSION = "Authorize-Permission";
 
     @Override
     public void invoke(Request request, Response response, CompositeValve compositeValve) {
@@ -64,6 +68,39 @@ public class WebappAuthenticationValve extends CarbonTomcatValve {
             authenticationInfo.setStatus(status);
         }
 
+        // This section will allow to validate a given access token is authenticated to access given
+        // resource(permission)
+        if (request.getCoyoteRequest() != null
+                && StringUtils.isNotEmpty(request.getHeader(AUTHORIZE_PERMISSION))
+                && (authenticationInfo.getStatus() == WebappAuthenticator.Status.CONTINUE ||
+                authenticationInfo.getStatus() == WebappAuthenticator.Status.SUCCESS)) {
+            boolean isAllowed;
+            try {
+                isAllowed = AuthenticationFrameworkUtil.isUserAuthorized(
+                        authenticationInfo.getTenantId(), authenticationInfo.getTenantDomain(),
+                        authenticationInfo.getUsername(),
+                        PERMISSION_PREFIX + request.getHeader (AUTHORIZE_PERMISSION));
+            } catch (AuthenticationException e) {
+                String msg = "Could not authorize permission";
+                log.error(msg);
+                AuthenticationFrameworkUtil.handleResponse(request, response,
+                        HttpServletResponse.SC_INTERNAL_SERVER_ERROR, msg);
+                return;
+            }
+
+            if (isAllowed) {
+                Gson gson = new Gson();
+                AuthenticationFrameworkUtil.handleResponse(request, response, HttpServletResponse.SC_OK,
+                        gson.toJson(authenticationInfo));
+                return;
+            } else {
+                log.error("Unauthorized message from user " + authenticationInfo.getUsername());
+                AuthenticationFrameworkUtil.handleResponse(request, response,
+                        HttpServletResponse.SC_FORBIDDEN, "Unauthorized to access the API");
+                return;
+            }
+        }
+
         Tenant tenant = null;
         if (authenticationInfo.getTenantId() != -1) {
             try {