Keul wiki

Sources:

• http://icephoenix.us/linuxunix/apache-and-http-authentication-with-pam/
• https://code.google.com/p/mod-auth-external/wiki/ModAuthzUnixGroup

sudo apt-get install libapache2-mod-authnz-external pwauth
sudo apt-get install libapache2-mod-authz-unixgroup
sudo a2enmod authnz_external authz_unixgroup
sudo service apache2 reload

vi /etc/apache2/apache2.conf
<IfModule mod_authnz_external.c>
AddExternalAuth pwauth /usr/sbin/pwauth
SetExternalAuthMethod pwauth pipe
</IfModule>

dans .htaccess:
AuthType Basic
AuthName "Identification requise (utilisation de votre compte linux)"
AuthBasicProvider external
AuthExternal pwauth
Require unix-group www-data

Source: http://stackoverflow.com/questions/8697706/exclude-one-folder-in-htaccess-protected-directory

vi .htaccess:
Satisfy any