feat: change /etc/ImageMagick-6/policy.xml for CVE-2016–3714

Dockerfile

@@ -10,6 +10,9 @@ RUN apt-get update && apt-get install -y \
   curl -sL "https://deb.nodesource.com/setup_16.x" | bash - && \
   apt-get install -y nodejs yarn
 
+#cf https://imagetragick.com/
+ADD image_magick_policy.xml /etc/ImageMagick-6/policy.xml
+
 ENV INSTALL_PATH /app
 RUN mkdir -p ${INSTALL_PATH}
 WORKDIR ${INSTALL_PATH}

image_magick_policy.xml

@@ -0,0 +1,102 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE policymap [
+  <!ELEMENT policymap (policy)*>
+  <!ATTLIST policymap xmlns CDATA #FIXED ''>
+  <!ELEMENT policy EMPTY>
+  <!ATTLIST policy xmlns CDATA #FIXED '' domain NMTOKEN #REQUIRED
+    name NMTOKEN #IMPLIED pattern CDATA #IMPLIED rights NMTOKEN #IMPLIED
+    stealth NMTOKEN #IMPLIED value CDATA #IMPLIED>
+]>
+<!--
+  Configure ImageMagick policies.
+
+  Domains include system, delegate, coder, filter, path, or resource.
+
+  Rights include none, read, write, execute and all.  Use | to combine them,
+  for example: "read | write" to permit read from, or write to, a path.
+
+  Use a glob expression as a pattern.
+
+  Suppose we do not want users to process MPEG video images:
+
+    <policy domain="delegate" rights="none" pattern="mpeg:decode" />
+
+  Here we do not want users reading images from HTTP:
+
+    <policy domain="coder" rights="none" pattern="HTTP" />
+
+  The /repository file system is restricted to read only.  We use a glob
+  expression to match all paths that start with /repository:
+
+    <policy domain="path" rights="read" pattern="/repository/*" />
+
+  Lets prevent users from executing any image filters:
+
+    <policy domain="filter" rights="none" pattern="*" />
+
+  Any large image is cached to disk rather than memory:
+
+    <policy domain="resource" name="area" value="1GP"/>
+
+  Use the default system font unless overwridden by the application:
+
+    <policy domain="system" name="font" value="/usr/share/fonts/favorite.ttf"/>
+
+  Define arguments for the memory, map, area, width, height and disk resources
+  with SI prefixes (.e.g 100MB).  In addition, resource policies are maximums
+  for each instance of ImageMagick (e.g. policy memory limit 1GB, -limit 2GB
+  exceeds policy maximum so memory limit is 1GB).
+
+  Rules are processed in order.  Here we want to restrict ImageMagick to only
+  read or write a small subset of proven web-safe image types:
+
+    <policy domain="delegate" rights="none" pattern="*" />
+    <policy domain="filter" rights="none" pattern="*" />
+    <policy domain="coder" rights="none" pattern="*" />
+    <policy domain="coder" rights="read|write" pattern="{GIF,JPEG,PNG,WEBP}" />
+-->
+<policymap>
+  <!-- <policy domain="resource" name="temporary-path" value="/tmp"/> -->
+  <policy domain="resource" name="memory" value="256MiB"/>
+  <policy domain="resource" name="map" value="512MiB"/>
+  <policy domain="resource" name="width" value="16KP"/>
+  <policy domain="resource" name="height" value="16KP"/>
+  <!-- <policy domain="resource" name="list-length" value="128"/> -->
+  <policy domain="resource" name="area" value="128MP"/>
+  <policy domain="resource" name="disk" value="1GiB"/>
+  <!-- <policy domain="resource" name="file" value="768"/> -->
+  <!-- <policy domain="resource" name="thread" value="4"/> -->
+  <!-- <policy domain="resource" name="throttle" value="0"/> -->
+  <!-- <policy domain="resource" name="time" value="3600"/> -->
+  <!-- <policy domain="coder" rights="none" pattern="MVG" /> -->
+  <!-- <policy domain="module" rights="none" pattern="{PS,PDF,XPS}" /> -->
+  <!-- <policy domain="path" rights="none" pattern="@*" /> -->
+  <!-- <policy domain="cache" name="memory-map" value="anonymous"/> -->
+  <!-- <policy domain="cache" name="synchronize" value="True"/> -->
+  <!-- <policy domain="cache" name="shared-secret" value="passphrase" stealth="true"/>
+  <!-- <policy domain="system" name="max-memory-request" value="256MiB"/> -->
+  <!-- <policy domain="system" name="shred" value="2"/> -->
+  <!-- <policy domain="system" name="precision" value="6"/> -->
+  <!-- <policy domain="system" name="font" value="/path/to/font.ttf"/> -->
+  <!-- <policy domain="system" name="pixel-cache-memory" value="anonymous"/> -->
+  <!-- <policy domain="system" name="shred" value="2"/> -->
+  <!-- <policy domain="system" name="precision" value="6"/> -->
+  <!-- not needed due to the need to use explicitly by mvg: -->
+  <!-- <policy domain="delegate" rights="none" pattern="MVG" /> -->
+  <!-- use curl -->
+  <policy domain="delegate" rights="none" pattern="URL" />
+  <policy domain="delegate" rights="none" pattern="HTTPS" />
+  <policy domain="delegate" rights="none" pattern="HTTP" />
+  <!-- in order to avoid to get image with password text -->
+  <policy domain="path" rights="none" pattern="@*"/>
+  <!-- disable ghostscript format types -->
+  <policy domain="coder" rights="none" pattern="PS" />
+  <policy domain="coder" rights="none" pattern="PS2" />
+  <policy domain="coder" rights="none" pattern="PS3" />
+  <policy domain="coder" rights="none" pattern="EPS" />
+  <policy domain="coder" rights="none" pattern="PDF" />
+  <policy domain="coder" rights="none" pattern="XPS" />
+  <policy domain="coder" rights="none" pattern="*"/>
+  <policy domain="coder" rights="read | write" pattern="{JPG,JPEG,PNG}"/>
+  <policy domain="module" rights="none" pattern="{MSL,MVG,PS,SVG,URL,XPS}"/>
+</policymap>