diff --git a/Dockerfile b/Dockerfile
index 17fa426..f05fc33 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -53,14 +53,17 @@ COPY nginx/nginx.conf ${TFW_NGINX_CONF}
 COPY nginx/default.conf ${TFW_NGINX_DEFAULT}
 COPY lib ${TFW_LIB_DIR}
 
+RUN for dir in "${TFW_LIB_DIR}" "/etc/nginx" "/etc/supervisor"; do \
+        chown -R root:root "$dir" && chmod -R 700 "$dir";          \
+    done
+
 ONBUILD ARG BUILD_CONTEXT="."
 ONBUILD ARG NOFRONTEND=""
 
 ONBUILD COPY ${BUILD_CONTEXT}/nginx/components/ ${TFW_NGINX_COMPONENTS}
 ONBUILD COPY ${BUILD_CONTEXT}/supervisor/components/ ${TFW_SUPERVISORD_COMPONENTS}
 
-ONBUILD RUN chown -R ${AVATAO_USER} /var/log/nginx /var/lib/nginx                                          &&\
-            for f in "${TFW_NGINX_DEFAULT}" ${TFW_NGINX_COMPONENTS}/*.conf; do                               \
+ONBUILD RUN for f in "${TFW_NGINX_DEFAULT}" ${TFW_NGINX_COMPONENTS}/*.conf; do                               \
                 envsubst "$(printenv | cut -d= -f1 | grep TFW_ | sed -e 's/^/$/g')" < $f > $f~ && mv $f~ $f ;\
             done
 ONBUILD VOLUME ["/etc/nginx", "/var/lib/nginx", "/var/log/nginx"]
diff --git a/lib/tfw/components/source_code_event_handler.py b/lib/tfw/components/source_code_event_handler.py
index 6bc020c..fbaffd8 100644
--- a/lib/tfw/components/source_code_event_handler.py
+++ b/lib/tfw/components/source_code_event_handler.py
@@ -1,7 +1,7 @@
 # Copyright (C) 2018 Avatao.com Innovative Learning Kft.
 # All Rights Reserved. See LICENSE file for details.
 
-from os.path import isfile, join, relpath, exists, isdir
+from os.path import isfile, join, relpath, exists, isdir, realpath
 from glob import glob
 from fnmatch import fnmatchcase
 from collections import Iterable
@@ -13,9 +13,10 @@ from tfw.config.logs import logging
 LOG = logging.getLogger(__name__)
 
 
-class FileManager:
-    def __init__(self, working_directory, selected_file=None, exclude=None):
+class FileManager:  # pylint: disable=too-many-instance-attributes
+    def __init__(self, working_directory, allowed_directories, selected_file=None, exclude=None):
         self._exclude, self.exclude = None, exclude
+        self._allowed_directories, self.allowed_directories = None, allowed_directories
         self._workdir, self.workdir = None, working_directory
         self._filename, self.filename = None, selected_file or self.files[0]
 
@@ -39,8 +40,18 @@ class FileManager:
     def workdir(self, directory):
         if not exists(directory) or not isdir(directory):
             raise EnvironmentError('"{}" is not a directory!'.format(directory))
+        if not self._is_whitelisted(directory):
+            raise EnvironmentError('Directory "{}" is not in whitelist!'.format(directory))
         self._workdir = directory
 
+    @property
+    def allowed_directories(self):
+        return self._allowed_directories
+
+    @allowed_directories.setter
+    def allowed_directories(self, directories):
+        self._allowed_directories = directories
+
     @property
     def filename(self):
         return self._filename
@@ -54,8 +65,9 @@ class FileManager:
     @property
     def files(self):
         return [self._relpath(file) for file in glob(join(self._workdir, '**/*'), recursive=True)
-                if isfile(file) and
-                not any(fnmatchcase(file, blacklisted) for blacklisted in self.exclude)]
+                if isfile(file)
+                    and self._is_whitelisted(file)
+                    and not any(fnmatchcase(file, blacklisted) for blacklisted in self.exclude)]
 
     @property
     def file_contents(self):
@@ -67,6 +79,9 @@ class FileManager:
         with open(self._filepath(self.filename), 'w', errors='surrogateescape') as ofile:
             ofile.write(value)
 
+    def _is_whitelisted(self, file):
+        return any(realpath(file).startswith(allowed_dir) for allowed_dir in self.allowed_directories)
+
     def _filepath(self, filename):
         return join(self._workdir, filename)
 
@@ -75,9 +90,11 @@ class FileManager:
 
 
 class SourceCodeEventHandler(TriggerlessEventHandler):
-    def __init__(self, key, directory, selected_file=None, exclude=None):
+    # pylint: disable=too-many-arguments
+    def __init__(self, key, directory, allowed_directories, selected_file=None, exclude=None):
         super().__init__(key)
-        self.filemanager = FileManager(directory, selected_file=selected_file, exclude=exclude)
+        self.filemanager = FileManager(allowed_directories=allowed_directories, working_directory=directory,
+                                       selected_file=selected_file, exclude=exclude)
 
         self.commands = {'read':      self.read,
                          'write':     self.write,
diff --git a/lib/tfw/components/terminado_event_handler.py b/lib/tfw/components/terminado_event_handler.py
index 50245f5..76621a4 100644
--- a/lib/tfw/components/terminado_event_handler.py
+++ b/lib/tfw/components/terminado_event_handler.py
@@ -5,6 +5,7 @@ from tfw.components.terminado_mini_server import TerminadoMiniServer
 from tfw.event_handler_base import TriggerlessEventHandler
 from tfw.config import TFWENV
 from tfw.config.logs import logging
+from tao.config import TAOENV
 
 LOG = logging.getLogger(__name__)
 
@@ -14,7 +15,8 @@ class TerminadoEventHandler(TriggerlessEventHandler):
         super().__init__(key)
         self.working_directory = TFWENV.TERMINADO_DIR
         self._historymonitor = monitor
-        self.terminado_server = TerminadoMiniServer('/terminal', TFWENV.TERMINADO_PORT, TFWENV.TERMINADO_WD, ['bash'])
+        bash_as_user_cmd = ['sudo', '-u', TAOENV.USER, 'bash']
+        self.terminado_server = TerminadoMiniServer('/terminal', TFWENV.TERMINADO_PORT, TFWENV.TERMINADO_WD, bash_as_user_cmd)
         self.commands = {'write': self.write,
                          'read': self.read}
         if self._historymonitor:
diff --git a/supervisor/supervisord.conf b/supervisor/supervisord.conf
index 4a14c2b..6e9e04c 100644
--- a/supervisor/supervisord.conf
+++ b/supervisor/supervisord.conf
@@ -1,5 +1,5 @@
 [supervisord]
-user=user
+user=root
 logfile = /tmp/supervisord.log
 loglevel = debug
 pidfile = /tmp/supervisord.pid
@@ -18,9 +18,5 @@ command=/usr/sbin/nginx -g 'daemon off;'
 autostart=true
 autorestart=true
 
-[program:app]
-directory=%(ENV_TFW_APP_DIR)s
-command=python3 app.py
-
 [include]
 files=%(ENV_TFW_SUPERVISORD_COMPONENTS)s/*.conf