Fix boolean parsing in OpenVPNPlugin

[Repsay]

Resolved an issue in the OpenVPNPlugin where the 'client-to-client' configuration option was incorrectly processed. Previously, the code attempted to use the value directly from the configuration, which led to errors when this value was an empty string. This fix ensures that an empty string for 'client-to-client' defaults to False, aligning with the expected boolean behavior of this configuration parameter.

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[pyrco]

Hi @Repsay, thanks for the bug fix!

Looking a bit further into the issue I think this issue is better fixed in the _parse_config() function. As I understand it OpenVPN allows options in its config file without any extra values to toggle them "on". The duplicate_cn option, used below the line you patched, for instance also works this way.

To have a general fix for these kind of options we could replace the line:

            value = value[0] if value else ""

in _parse_config() with:

            value = value[0] if value else True

Feel free to update your PR. Otherwise we can open a bug issue and will get to fixing it in due time.

[Repsay]

Hi @pyrco, thank you for the suggestion to refine the issue in the _parse_config() function. I agree that a more general fix would be beneficial, particularly considering how OpenVPN processes options without extra values.

To address this, I've already updated the pull request. In addition to your suggestion, I've incorporated a dynamic way to identify boolean fields with the line boolean_fields = OpenVPNServer.getfields("boolean") + OpenVPNClient.getfields("boolean"). This enhancement should ensure that our parsing logic accurately reflects the nature of both OpenVPNServer and OpenVPNClient configurations.

Here's the revised section of the code:

if any(key == boolean_field.name for boolean_field in boolean_fields):
    value = value[0] if value else True
else:
    value = value[0] if value else ""
    # This removes all text after the first comment
    value = CONFIG_COMMENT_SPLIT_REGEX.split(value, 1)[0].strip()

This update should offer a more robust and comprehensive solution to handle the OpenVPN configuration options correctly. Please review the changes in the updated PR, and let me know if you have any further suggestions or if additional modifications are required.

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[Repsay]

@pyrco, I've updated the code incorporating your recommendations. Please take a look and let me know if there's anything else you'd like adjusted.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (82eb186) 73.96% compared to head (05f05b0) 73.96%.

Files	Patch %	Lines
dissect/target/plugins/apps/vpn/openvpn.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #479      +/-   ##
==========================================
- Coverage   73.96%   73.96%   -0.01%     
==========================================
  Files         260      260              
  Lines       21034    21038       +4     
==========================================
+ Hits        15558    15560       +2     
- Misses       5476     5478       +2     

Flag	Coverage Δ
unittests	73.96% <75.00%> (-0.01%)	⬇️

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