Why id CGI/FCGI disabled in lighttpd?

[Sebastian_M]

Expected Behaviour:

lighttpd should execute CGI / FCGI

Actual Behaviour:

lighttpd does not execute CGI / FCGI

I want to run an additional site on pi hole's lighttpd. It is generated by FCGI. However, execution of CGI / FCGI seems to be disabled by pi hole's lighttpd configuration. Does anyone know the reasons behind this? Any disadvantage if I change the corresponding lighttpd config?

[Mcat12]

lighttpd should be configured to run PHP via CGI. Beyond that, we don't explicitly intend to disable CGI generally. If you change the config (instead of adding a config at /etc/lighttpd/external.conf or elsewhere), note that it will be overwritten when repairing or updating.

[deHakkelaar]

pi@noads:~ $ apt show php7.0-cgi
[..]
Description: server-side, HTML-embedded scripting language (CGI binary)
 This package provides the /usr/lib/cgi-bin/php CGI interpreter built
 for use in Apache 2 with mod_actions, or any other CGI httpd that
 supports a similar mechanism.  Note that MOST users probably
 want the php7.0-fpm package.
 .
 The following extensions are built in: Core date filter hash libxml openssl
 pcntl pcre Reflection session SPL standard zlib.
 .
 PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely-used
 open source general-purpose scripting language that is especially suited
 for web development and can be embedded into HTML.

---

pi@noads:~ $ apt-file list php7.0-cgi
php7.0-cgi: /etc/apache2/conf-available/php7.0-cgi.conf
php7.0-cgi: /usr/bin/php-cgi7.0
php7.0-cgi: /usr/lib/cgi-bin/php7.0
php7.0-cgi: /usr/lib/php/7.0/sapi/cgi
php7.0-cgi: /usr/share/bug/php7.0-cgi/control
php7.0-cgi: /usr/share/bug/php7.0-cgi/script
php7.0-cgi: /usr/share/doc/php7.0-cgi
php7.0-cgi: /usr/share/lintian/overrides/php7.0-cgi
php7.0-cgi: /usr/share/man/man1/php-cgi7.0.1.gz

---

pi@noads:~ $ apt depends php7.0-cgi
php7.0-cgi
  Depends: libmagic1
  Depends: libpcre3 (>= 1:8.20)
  Depends: mime-support
  Depends: php7.0-cli
  Depends: php7.0-common (= 7.0.33-0+deb9u3)
  Depends: php7.0-json
  Depends: php7.0-opcache
  Depends: tzdata
  Depends: ucf
  Depends: libc6 (>= 2.15)
  Depends: libssl1.1 (>= 1.1.0)
  Depends: libxml2 (>= 2.8.0)
  Depends: zlib1g (>= 1:1.2.3.4)
  Suggests: php-pear

---

pi@noads:~ $ apt show php7.0-fpm
[..]
Description: server-side, HTML-embedded scripting language (FPM-CGI binary)
 This package provides the Fast Process Manager interpreter that runs
 as a daemon and receives Fast/CGI requests.  Note that MOST Apache users
 probably want the libapache2-mod-php7.0 package.
 .
 The following extensions are built in: Core date filter hash libxml openssl
 pcre Reflection session SPL standard zlib.
 .
 PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely-used
 open source general-purpose scripting language that is especially suited
 for web development and can be embedded into HTML.

---

pi@noads:~ $ apt-file list php7.0-fpm
php7.0-fpm: /etc/apache2/conf-available/php7.0-fpm.conf
php7.0-fpm: /etc/init.d/php7.0-fpm
php7.0-fpm: /etc/init/php7.0-fpm.conf
php7.0-fpm: /etc/logrotate.d/php7.0-fpm
php7.0-fpm: /etc/php/7.0/fpm/php-fpm.conf
php7.0-fpm: /etc/php/7.0/fpm/pool.d/www.conf
php7.0-fpm: /lib/systemd/system/php7.0-fpm.service
php7.0-fpm: /usr/lib/php/7.0/sapi/fpm
php7.0-fpm: /usr/lib/php/php7.0-fpm-reopenlogs
php7.0-fpm: /usr/lib/tmpfiles.d/php7.0-fpm.conf
php7.0-fpm: /usr/sbin/php-fpm7.0
php7.0-fpm: /usr/share/bug/php7.0-fpm/control
php7.0-fpm: /usr/share/bug/php7.0-fpm/script
php7.0-fpm: /usr/share/doc/php7.0-fpm
php7.0-fpm: /usr/share/lintian/overrides/php7.0-fpm
php7.0-fpm: /usr/share/man/man8/php-fpm7.0.8.gz
php7.0-fpm: /usr/share/php/7.0/fpm/status.html

---

pi@noads:~ $ apt depends php7.0-fpm
php7.0-fpm
  Depends: libmagic1
  Depends: libpcre3 (>= 1:8.20)
  Depends: mime-support
  Depends: php7.0-cli
  Depends: php7.0-common (= 7.0.33-0+deb9u3)
  Depends: php7.0-json
  Depends: php7.0-opcache
  Depends: procps
  Depends: tzdata
  Depends: ucf
  Depends: init-system-helpers (>= 1.18~)
  Depends: libapparmor1 (>= 2.7.0~beta1+bzr1772)
  Depends: libc6 (>= 2.15)
  Depends: libssl1.1 (>= 1.1.0)
  Depends: libsystemd0
  Depends: libxml2 (>= 2.8.0)
  Depends: zlib1g (>= 1:1.2.3.4)
  Suggests: php-pear

https://www.cyberciti.biz/tips/lighttpd-php-fastcgi-configuration.html

Install the package (depending PHP version):

sudo apt install php7.0-fpm

And put additional configuration directives in below file:

/etc/lighttpd/external.conf