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https://issues.apache.org/jira/browse/TIKA-2731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16623638#comment-16623638
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ASF GitHub Bot commented on TIKA-2731:
--------------------------------------
jkakavas opened a new pull request #250: fix for TIKA-2731 contributed by
@jkakavas
URL: https://github.com/apache/tika/pull/250
As part of the changes introduced in 1.19 `determineMaxEntityExpansions`
needs to read the `jdk.xml.entityExpansionLimit` System Property in order to
overwrite the default value of 20, if it is set.
This is however by reading all System Properties with
`System#getProperties()` and attempting to find the relevant key in the
properties Object. The issue with this approach is that
`System#getProperties()` requires:
```
java.util.PropertyPermission "*", "read,write"
```
which is an overly permissive one to allow for the given use case.
A more sane approach, following the least privilege design principal would
be to use `System.getProperty()` for the specific property that only requires
```
java.util.PropertyPermission "jdk.xml.entityExpansionLimit", "read"
```
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> Unecessary call to System.getProperties() in XMLReaderUtils
> -----------------------------------------------------------
>
> Key: TIKA-2731
> URL: https://issues.apache.org/jira/browse/TIKA-2731
> Project: Tika
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.19
> Reporter: Ioannis Kakavas
> Priority: Major
> Fix For: 1.20
>
>
> As part of the changes introduced in [1.19
> |https://github.com/apache/tika/commit/4e67928412ad56333d400f3728ecdb59d07d9d63]
> determineMaxEntityExpansions needs to read the jdk.xml.entityExpansionLimit
> System Property in order to overwrite the default value of 20, if it is set.
> This is however by reading all System Properties with System.getProperties()
> and attempting to find the relevant key in the properties Object. The issue
> with this approach is that getProperties() requires
> {noformat}java.util.PropertyPermission "*", "read,write"{noformat}
> which is overly permissive.
> A more sane approach, following the least privilege design principal would be
> to use System.getProperty() for the specific property that only requires
> {noformat}java.util.PropertyPermission "jdk.xml.entityExpansionLimit",
> "read"{noformat}
>
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