Ubuntu 16.04
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Enable suEXEC
2016/06/13
 
Normally, a process owner of CGI performing is the Apache admin user, but it's possible to perform CGI scripts with other userID as process owner to enable suEXEC function.
[1] Enable suEXEC.
root@www:~#
apt-get -y install apache2-suexec-custom
root@www:~#
a2enmod suexec

Enabling module suexec.
To activate the new configuration, you need to run:
  service apache2 restart

root@www:~#
systemctl restart apache2
[2] For example, Configure suEXEC settings with a user "ubuntu" like follows. The environment of virtualhost of this example is the same with here.
root@www:~#
vi /etc/apache2/suexec/www-data
# add to the head of a file: the directory for enabling suEXEC

/home/ubuntu/public_html

/var/www
public_html/cgi-bin
root@www:~#
vi /etc/apache2/sites-enabled/virtual.host.conf
<VirtualHost *:80>
    ServerName www.virtual.host
    ServerAdmin webmaster@virtual.host
    DocumentRoot /home/ubuntu/public_html
    ErrorLog /var/log/apache2/virtual.host.error.log
    CustomLog /var/log/apache2/virtual.host.access.log combined
    LogLevel warn
    # set "ubuntu" user for suEXEC
    SuexecUserGroup ubuntu ubuntu
    <Directory "/home/ubuntu/public_html">
        Options +ExecCGI
        AddHandler cgi-script .cgi .pl
    </Directory>
</VirtualHost>

root@www:~#
systemctl restart apache2
[3] Create a test script which has 700 permission with the user "ubuntu" and make sure it works normally.
ubuntu@www:~$
vi ~/public_html/suexec.cgi
#!/usr/bin/perl

print "Content-type: text/html\n\n";
print "<html>\n<body>\n";
print "<div style=\"width: 100%; font-size: 40px; font-weight: bold; text-align: center;\">\n";
print "suEXEC Test Page";
print "\n</div>\n";
print "</body>\n</html>\n";

ubuntu@www:~$
chmod 700 ~/public_html/suexec.cgi

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