Chrooting of server.

package.json

@@ -21,6 +21,7 @@
     "release:archive": "zip -rq release.zip package.json package-lock.json node_modules/ *.js src/ config/ locales/"
   },
   "dependencies": {
+    "chroot": "1.0.10",
     "co-body": "6.0.0",
     "config": "3.2.2",
     "koa": "2.7.0",
@@ -32,7 +33,7 @@
     "nodemailer": "6.3.0",
     "openpgp": "4.5.5",
     "winston": "3.2.1",
-    "winston-papertrail": "1.0.5"
+    "winston-papertrail": "1.0.5",
   },
   "devDependencies": {
     "bootstrap": "^3.4.1",

src/index.js

@@ -20,12 +20,23 @@
 const log = require('winston');
 const config = require('config');
 const init = require('./app');
+const chroot = require('chroot');
 
 (async () => {
   try {
     const app = await init();
     app.listen(config.server.port, "localhost");
-    log.info('app', `Listening on http://localhost:${config.server.port}`);
+    log.info('app', `Listening on http://localhost:${config.server.port}`, function(err) {
+      if (err) { throw err; }
+ 
+      try {
+        chroot('/var/empty', 'test');
+        console.log('changed root to "/var/empty" and user to "test"');
+      } catch(err) {
+        console.error('changing root or user failed', err);
+        process.exit(1);
+      }
+    });
   } catch (err) {
     log.error('app', 'Initialization failed!', err);
   }