From c2f4a52d064511b3564e75b383115d02d15a9856 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Fri, 15 Jun 2018 18:52:31 -0400
Subject: logi1: Increase ImageMagick resource limits

---
diff --git a/hosts/logi1/im6-policy.xml b/hosts/logi1/im6-policy.xml
new file mode 100644
index 0000000..e729b0e
--- /dev/null
+++ b/hosts/logi1/im6-policy.xml
@@ -0,0 +1,73 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE policymap [
+<!ELEMENT policymap (policy)+>
+<!ELEMENT policy (#PCDATA)>
+<!ATTLIST policy domain (delegate|coder|filter|path|resource) #IMPLIED>
+<!ATTLIST policy name CDATA #IMPLIED>
+<!ATTLIST policy rights CDATA #IMPLIED>
+<!ATTLIST policy pattern CDATA #IMPLIED>
+<!ATTLIST policy value CDATA #IMPLIED>
+]>
+<!--
+  Configure ImageMagick policies.
+
+  Domains include system, delegate, coder, filter, path, or resource.
+
+  Rights include none, read, write, and execute.  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" />
+
+  Lets prevent users from executing any image filters:
+
+    <policy domain="filter" rights="none" pattern="*" />
+
+  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/*" />
+
+  Let's prevent possible exploits by removing the right to use indirect reads.
+
+    <policy domain="path" rights="none" pattern="@*" />
+
+  Any large image is cached to disk rather than memory:
+
+    <policy domain="resource" name="area" value="1GB"/>
+
+  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).
+-->
+<policymap>
+  <!-- <policy domain="resource" name="temporary-path" value="/tmp"/> -->
+  <policy domain="resource" name="memory" value="16GiB"/>
+  <policy domain="resource" name="map" value="16GiB"/>
+  <policy domain="resource" name="width" value="16KP"/>
+  <policy domain="resource" name="height" value="16KP"/>
+  <policy domain="resource" name="area" value="16GiB"/>
+  <policy domain="resource" name="disk" value="16GiB"/>
+  <!-- <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="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="@*"/>
+  <policy domain="cache" name="shared-secret" value="passphrase" stealth="true"/>
+</policymap>
diff --git a/hosts/logi1/postinst b/hosts/logi1/postinst
index 4ed9153..95c813e 100644
--- a/hosts/logi1/postinst
+++ b/hosts/logi1/postinst
@@ -105,6 +105,10 @@ Section "Device"
 EndSection
 EOF
 
+# Increase ImageMagick resource limits.
+install -u 0 -g 0 -m 0644 "$(dirname "${0}")/hosts/${host}/im6-policy.xml" \
+	"${target}/etc/ImageMagick-6/policy.xml"
+
 # Add user to groups created by postinst_pkgs.
 in_target adduser pj scanner || return 1
 in_target adduser pj wireshark || return 1
--
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