/etc/ImageMagick-6/policy.xml is in imagemagick-6-common 8:6.9.7.4+dfsg-16ubuntu6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!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="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="area" value="128MB"/>
<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="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>
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