ava/imagemagick.policy.xml

<!--

  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/.


  Web-safe ImageMagick security policy:

  This security protocol designed for web-safe usage focuses on situations
  where ImageMagick is applied in publicly accessible contexts, like websites.
  It deactivates the capability to read from or write to any image formats
  other than web-safe formats like GIF, JPEG, and PNG. Additionally, this
  policy prohibits the execution of image filters and indirect reads, thereby
  thwarting potential security breaches. By implementing these limitations,
  the web-safe policy fortifies the safeguarding of systems accessible to
  the public, reducing the risk of exploiting ImageMagick's capabilities
  for potential attacks.
-->
<policymap>
    <!-- Set maximum parallel threads. -->
    <policy domain="resource" name="thread" value="2"/>
    <!--
    Set maximum time to live in seconds or mnemonics, e.g. "2 minutes". When
        this limit is exceeded, an exception is thrown and processing stops. 
    -->
    <policy domain="resource" name="time" value="60"/>
    <!--
    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="16"/>
    <!--
    Set the maximum width of an image.  When this limit is exceeded, an
        exception is thrown. 
    -->
    <policy domain="resource" name="width" value="4KP"/>
    <!--
    Set the maximum height of an image.  When this limit is exceeded, an
        exception is thrown. 
    -->
    <policy domain="resource" name="height" value="4KP"/>
    <!--
    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="@*"/>
    <!--
    Deny all image modules and specifically exempt reading or writing
        web-safe image formats. 
    -->
    <policy domain="module" rights="none" pattern="*"/>
    <policy domain="module" rights="read | write" pattern="{BMP,GIF,JPEG,PNG,TIFF,WEBP}"/>
    <policy domain="module" rights="read | write" pattern="{MPC}" stealth="true"/>
    <policy domain="module" rights="write" pattern="{JSON,INFO,PNM,PS}"/>
    <!--
    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>