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January 8, 2024 09:28
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ImageMagick-6 unlimited policy
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<?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 overridden 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="2GiB"/> --> | |
<!-- <policy domain="resource" name="map" value="4GiB"/> --> | |
<!-- <policy domain="resource" name="width" value="10KP"/> --> | |
<!-- <policy domain="resource" name="height" value="10KP"/> --> | |
<!-- <policy domain="resource" name="list-length" value="128"/> --> | |
<!-- <policy domain="resource" name="area" value="100MP"/> --> | |
<!-- <policy domain="resource" name="disk" value="16EiB"/> --> | |
<!-- <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="delegate" rights="none" pattern="HTTPS" /> --> | |
<!-- <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="cache" name="synchronize" value="true"/> --> | |
<!-- <policy domain="system" name="shred" value="1"/> --> | |
<!-- <policy domain="system" name="font" value="/path/to/unicode-font.ttf"/> --> | |
<policy domain="Undefined" rights="none"/> | |
</policymap> |
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