Introduce RBAC checking via custom authHandler function

c/httpserver.c

@@ -3349,6 +3349,27 @@ static int handleServiceFailed(HttpConversation *conversation,
   return HTTP_SERVICE_FAILED;
 }
 
+static int checkAuthorization(HttpServer *server, HttpService *service, HttpRequest *request, HttpResponse *response) {
+  if (!request->authenticated) {
+    return FALSE;
+  }
+  if (service->authorizationType == SERVICE_AUTHORIZATION_TYPE_NONE) {
+    return TRUE;
+  }
+  int authorized = TRUE;
+  HttpAuthorizationHandler *handler = server->authorizationHandlerList;
+  while (handler) {
+    if (handler->authorizationType == service->authorizationType) {
+      authorized = handler->authorizationHandler(service, request, response, handler->userData);
+      if (!authorized) {
+        break;
+      }
+    }
+    handler = handler->next;
+  }
+  return authorized;
+}
+
 static int handleHttpService(HttpServer *server,
                              HttpService *service,
                              HttpRequest *request,
@@ -3435,8 +3456,9 @@ static int handleHttpService(HttpServer *server,
     }
     break;
   }
+  int authorized = checkAuthorization(server, service, request, response);
 #ifdef DEBUG
-  printf("service=%s authenticated=%d\n",service->name,request->authenticated);
+  printf("service=%s authenticated=%d authorized=%d\n",service->name,request->authenticated,authorized);
 #endif
   if (request->authenticated == FALSE){
     if (service->authFlags & SERVICE_AUTH_FLAG_OPTIONAL) {
@@ -3445,6 +3467,8 @@ static int handleHttpService(HttpServer *server,
     } else {
       respondWithAuthError(response, &authResponse);
     }
+  } else if (!authorized) {
+    respondWithError(response, HTTP_STATUS_FORBIDDEN, "Forbidden");
     // Response is finished on return
   } else {
 
@@ -6001,7 +6025,27 @@ int mainHttpLoop(HttpServer *server){
   return stcBaseMainLoop(base, MAIN_WAIT_MILLIS);
 }
 
-
+void registerHttpAuthorizationHandler(HttpServer *server, int authorizationType, AuthorizationHandler *authorizationHandler, void *userData) {
+  if (authorizationType == SERVICE_AUTHORIZATION_TYPE_NONE) {
+    return;
+  }
+  HttpAuthorizationHandler *handler = (HttpAuthorizationHandler*) safeMalloc(sizeof(*handler), "HttpAuthorizationHandler");
+  if (handler) {
+    handler->authorizationType = authorizationType;
+    handler->authorizationHandler = authorizationHandler;
+    handler->userData = userData;
+    handler->next = NULL;
+    HttpAuthorizationHandler *head = server->authorizationHandlerList;
+    if (!head) {
+      server->authorizationHandlerList = handler;
+    } else {
+      while (head->next != NULL) {
+        head = head->next;
+      }
+      head->next = handler;
+    }
+  }
+}
 
 
 /*

h/httpserver.h

@@ -146,6 +146,7 @@ typedef int HttpServiceServe(struct HttpService_tag *service, HttpResponse *resp
 typedef int AuthExtract(struct HttpService_tag *service, HttpRequest *request);
 typedef int AuthValidate(struct HttpService_tag *service, HttpRequest *request);
 typedef int HttpServiceInsertCustomHeaders(struct HttpService_tag *service, HttpResponse *response);
+typedef int AuthorizationHandler(struct HttpService_tag *service, HttpRequest *request, HttpResponse *response, void *userData);
 
 /*
   returns HTTP_SERVICE_SUCCESS or other fail codes in same group 
@@ -205,8 +206,21 @@ typedef struct HttpService_tag{
   AuthValidate                   *authValidateFunction;
 #define SERVICE_AUTH_FLAG_OPTIONAL 1
   int    authFlags;
+#define SERVICE_AUTHORIZATION_TYPE_DEFAULT  0
+#define SERVICE_AUTHORIZATION_TYPE_NONE     1
+// Range 2..99 is reserved for future use
+#define SERVICE_AUTHORIZATION_TYPE_FIRST_CUSTOM 100
+// SERVICE_AUTHORIZATION_TYPE_FIRST_CUSTOM and higher can be defined and used by an application.
+  int authorizationType;
 } HttpService;
 
+typedef struct HttpAuthorizationHandler_tag {
+  int authorizationType;
+  AuthorizationHandler *authorizationHandler;
+  void *userData;
+  struct HttpAuthorizationHandler_tag *next;
+} HttpAuthorizationHandler;
+
 typedef struct HTTPServerConfig_tag {
   int port;
   HttpService *serviceList;
@@ -229,6 +243,7 @@ typedef struct HttpServer_tag{
   uint64           serverInstanceUID;   /* may be something smart at some point. Now just startup STCK */
   void             *sharedServiceMem; /* address shared by all HttpServices */
   hashtable        *loggingIdsByName; /* contains a map of pluginID -> loggingID */
+  HttpAuthorizationHandler *authorizationHandlerList;
 } HttpServer;
 
 typedef struct WSReadMachine_tag{
@@ -417,6 +432,17 @@ int httpServerSetSessionTokenKey(HttpServer *server, unsigned int size,
 
 int registerHttpService(HttpServer *server, HttpService *service);
 
+
+/*
+ * @brief Register an Authorization handler.
+ * @param server HTTP Server
+ * @param authorizationType
+ * @param authorizationHandler Function that performs authorization. 
+ *        The function has to return TRUE if the user succesfully authorized, otherwise - FALSe.
+ * @param userData Additional data for authorizationHandler
+ */
+void registerHttpAuthorizationHandler(HttpServer *server, int authorizationType, AuthorizationHandler *authorizationHandler, void *userData);
+
 HttpRequest *dequeueHttpRequest(HttpRequestParser *parser);
 HttpRequestParser *makeHttpRequestParser(ShortLivedHeap *slh);
 HttpResponse *makeHttpResponse(HttpRequest *request, ShortLivedHeap *slh, Socket *socket);