mod_sitemod_site.c file for
ProFTPD 1.3.x, and is compiled by default.
mod_site module is compiled by default.
Example configurations:
  # Block use of the SITE CHMOD command for changing file permissions
  <Limit SITE_CHMOD>
    DenyAll
  </Limit>
  # Block use of the SITE CHGRP command for changing group ownership
  <Limit SITE_CHGRP>
    DenyAll
  </Limit>