Good:
+ License GPL
+ Follows naming guidelines
+ URL to source
+ %clean section
+ use of %doc macro

Fix these and it's approved:
- Use %{_var}, %{_sysconfdir}, and %{_sbindir} macros for %files and %install
- Change Prereq to Requires. Also use Requires (post) and Requires (preun) style
for chkconfig and service requirements.
- use preferred BuildRoot of
%{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)

Also drop this stuff, unneeded:
- "[ "$RPM_BUILD_ROOT" != "/" ] && " in %clean
- Requires: openssl, pam, libcap
- usermod requirement, not used (commented out).