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support new configure script option: --with-security-policy={open,lim…
…ited,secure,web-safe}
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Cristy
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Aug 12, 2023
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| <?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> | ||
| ]> | ||
| <!-- | ||
| Limited ImageMagick security policy: | ||
| The primary objective of the limited security policy is to find a | ||
| middle ground between convenience and security. This policy involves the | ||
| deactivation of potentially hazardous functionalities, like specific coders | ||
| such as SVG or HTTP. Furthermore, it establishes several constraints on | ||
| the utilization of resources like memory, storage, and processing duration, | ||
| all of which are adjustable. This policy proves advantageous in situations | ||
| where there's a need to mitigate the potential threat of handling possibly | ||
| malicious or demanding images, all while retaining essential capabilities | ||
| for prevalent image formats. | ||
| 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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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| <?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> | ||
| ]> | ||
| <!-- | ||
| Open ImageMagick security policy: | ||
| The default policy for ImageMagick installations is the open security | ||
| policy. This policy is designed for usage in secure settings like those | ||
| protected by firewalls or within Docker containers. Within this framework, | ||
| ImageMagick enjoys broad access to resources and functionalities. This policy | ||
| provides convenient and adaptable options for image manipulation. However, | ||
| it's important to note that it might present security vulnerabilities in | ||
| less regulated conditions. Thus, organizations should thoroughly assess | ||
| the appropriateness of the open policy according to their particular use | ||
| case and security prerequisites. | ||
| 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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