BoxTrapper unable to verify authorization link when CageFS is enabled for the user

Symptoms

When a server is running CloudLinux with CageFS enabled for the user, when the user enables BoxTrapper in the cPanel account, the link in the verification email returns a blank page instead of a successful validation. 

Cause

This is due to a file needed for BoxTrapper not included in the /etc/cagefs/cagefs.mp file that is used to complete the verification.

CONFIG_TEXT: Can't locate cPstrict.pm in @INC (you may need to install the cPstrict module) (@INC contains: /usr/local/cpanel /usr/local/cpanel/3rdparty/perl/532/lib/perl5/cpanel_lib/x86_64-linux-64int /usr/local/cpanel/3rdparty/perl/532/lib/perl5/cpanel_lib /usr/local/cpanel/3rdparty/perl/532/lib/perl5/532/x86_64-linux-64int /usr/local/cpanel/3rdparty/perl/532/lib/perl5/532 /opt/cpanel/perl5/532/site_lib/x86_64-linux-64int /opt/cpanel/perl5/532/site_lib) at /usr/local/cpanel/Cpanel/Server/Type/Role/EnabledCache.pm line 8.

We've opened an internal case for our development team to track this further while this is looked into at CloudLinux. For reference, the case number is UPS-359. Follow this article to receive an email notification when a solution is published in the product. 

Resolution

Add the following line to /etc/cagefs/cagefs.mp:

CONFIG_TEXT: /usr/local/cpanel/

and run:

# cagefsctl -M

When the directory is mounted into CageFS and /usr/local/cpanel/cPstrict.pm is accessible, the verifications will complete.