--- ./config/policy.xml.orig	2020-11-01 12:48:38.817043527 -0600
+++ ./config/policy.xml	2020-11-01 12:51:00.357046694 -0600
@@ -52,6 +52,21 @@
     <policy domain="coder" rights="read|write" pattern="{GIF,JPEG,PNG,WEBP}" />
 -->
 <policymap>
+  <policy domain="cache" name="shared-secret" value="passphrase" stealth="true"/>
+  <!-- SECURITY:  disable potentially insecure coders: -->
+  <policy domain="coder" rights="none" pattern="EPHEMERAL" />
+  <policy domain="coder" rights="none" pattern="HTTPS" />
+  <policy domain="coder" rights="none" pattern="MVG" />
+  <policy domain="coder" rights="none" pattern="MSL" />
+  <policy domain="coder" rights="none" pattern="TEXT" />
+  <policy domain="coder" rights="none" pattern="SHOW" />
+  <policy domain="coder" rights="none" pattern="WIN" />
+  <policy domain="coder" rights="none" pattern="PLT" />
+  <!-- SECURITY:  prevent indirect reads: -->
+  <policy domain="path" rights="none" pattern="@*" />
+  <!-- SECURITY:  prevent pipe to shell: -->
+  <policy domain="path" rights="none" pattern="|*" />
+  <!-- Some examples: -->
   <!-- <policy domain="resource" name="temporary-path" value="/tmp"/> -->
   <!-- <policy domain="resource" name="memory" value="2GiB"/> -->
   <!-- <policy domain="resource" name="map" value="4GiB"/> -->
@@ -71,7 +86,6 @@
   <!-- <policy domain="cache" name="memory-map" value="anonymous"/> -->
   <!-- <policy domain="cache" name="max-memory-request" value="256MiB"/> -->
   <!-- <policy domain="cache" name="synchronize" value="True"/> -->
-  <!-- <policy domain="cache" name="shared-secret" value="passphrase" stealth="true"/> -->
   <!-- <policy domain="system" name="shred" value="2"/> -->
   <!-- <policy domain="system" name="precision" value="6"/> -->
 </policymap>