Current File : //etc/ImageMagick-6/policy-secure.xml
<?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 "">
<!ATTLIST policy domain NMTOKEN #REQUIRED>
<!ATTLIST policy name NMTOKEN #IMPLIED>
<!ATTLIST policy pattern CDATA #IMPLIED>
<!ATTLIST policy rights NMTOKEN #IMPLIED>
<!ATTLIST policy stealth NMTOKEN #IMPLIED>
<!ATTLIST policy value CDATA #IMPLIED>
]>
<!--
Creating a security policy that fits your specific local environment
before making use of ImageMagick is highly advised. You can find guidance on
setting up this policy at https://imagemagick.org/script/security-policy.php,
and it's important to verify your policy using the validation tool located
at https://imagemagick-secevaluator.doyensec.com/.
Secure ImageMagick security policy:
This stringent security policy prioritizes the implementation of
rigorous controls and restricted resource utilization to establish a
profoundly secure setting while employing ImageMagick. It deactivates
conceivably hazardous functionalities, including specific coders like
SVG or HTTP. The policy promotes the tailoring of security measures to
harmonize with the requirements of the local environment and the guidelines
of the organization. This protocol encompasses explicit particulars like
limitations on memory consumption, sanctioned pathways for reading and
writing, confines on image sequences, the utmost permissible duration of
workflows, allocation of disk space intended for image data, and even an
undisclosed passphrase for remote connections. By adopting this robust
policy, entities can elevate their overall security stance and alleviate
potential vulnerabilities.
-->
<policymap>
<!-- Set maximum parallel threads. -->
<policy domain="resource" name="thread" value="2"/>
<!-- Set maximum time in seconds. When this limit is exceeded, an exception
is thrown and processing stops. -->
<policy domain="resource" name="time" value="120"/>
<!-- Set maximum number of open pixel cache files. When this limit is
exceeded, any subsequent pixels cached to disk are closed and reopened
on demand. -->
<policy domain="resource" name="file" value="768"/>
<!-- Set maximum amount of memory in bytes to allocate for the pixel cache
from the heap. When this limit is exceeded, the image pixels are cached
to memory-mapped disk. -->
<policy domain="resource" name="memory" value="256MiB"/>
<!-- Set maximum amount of memory map in bytes to allocate for the pixel
cache. When this limit is exceeded, the image pixels are cached to
disk. -->
<policy domain="resource" name="map" value="512MiB"/>
<!-- Set the maximum width * height of an image that can reside in the pixel
cache memory. Images that exceed the area limit are cached to disk. -->
<policy domain="resource" name="area" value="16KP"/>
<!-- Set maximum amount of disk space in bytes permitted for use by the pixel
cache. When this limit is exceeded, the pixel cache is not be created
and an exception is thrown. -->
<policy domain="resource" name="disk" value="1GiB"/>
<!-- Set the maximum length of an image sequence. When this limit is
exceeded, an exception is thrown. -->
<policy domain="resource" name="list-length" value="32"/>
<!-- Set the maximum width of an image. When this limit is exceeded, an
exception is thrown. -->
<policy domain="resource" name="width" value="8KP"/>
<!-- Set the maximum height of an image. When this limit is exceeded, an
exception is thrown. -->
<policy domain="resource" name="height" value="8KP"/>
<!-- Periodically yield the CPU for at least the time specified in
milliseconds. -->
<!-- <policy domain="resource" name="throttle" value="2"/> -->
<!-- Do not create temporary files in the default shared directories, instead
specify a private area to store only ImageMagick temporary files. -->
<!-- <policy domain="resource" name="temporary-path" value="/magick/tmp/"/> -->
<!-- Force memory initialization by memory mapping select memory
allocations. -->
<policy domain="cache" name="memory-map" value="anonymous"/>
<!-- Ensure all image data is fully flushed and synchronized to disk. -->
<policy domain="cache" name="synchronize" value="true"/>
<!-- Replace passphrase for secure distributed processing -->
<!-- <policy domain="cache" name="shared-secret" value="secret-passphrase" stealth="true"/> -->
<!-- Do not permit any delegates to execute. -->
<policy domain="delegate" rights="none" pattern="*"/>
<!-- Do not permit any image filters to load. -->
<policy domain="filter" rights="none" pattern="*"/>
<!-- Don't read/write from/to stdin/stdout. -->
<policy domain="path" rights="none" pattern="-"/>
<!-- don't read sensitive paths. -->
<policy domain="path" rights="none" pattern="/etc/*"/>
<!-- Indirect reads are not permitted. -->
<policy domain="path" rights="none" pattern="@*"/>
<!-- These image types are security risks on read, but write is fine -->
<policy domain="module" rights="write" pattern="{MSL,MVG,PS,SVG,URL,XPS}"/>
<!-- This policy sets the number of times to replace content of certain
memory buffers and temporary files before they are freed or deleted. -->
<policy domain="system" name="shred" value="1"/>
<!-- Enable the initialization of buffers with zeros, resulting in a minor
performance penalty but with improved security. -->
<policy domain="system" name="memory-map" value="anonymous"/>
<!-- Set the maximum amount of memory in bytes that are permitted for
allocation requests. -->
<policy domain="system" name="max-memory-request" value="256MiB"/>
</policymap>
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