• Requires mod_authn_dovecot for Apache 2.2 and 2.4, which can authenticate against Dovecot using email address or just username (depending on Dovecot configuration)
• Requires auth_basic, authn_alias, authn_default, authz_default, authz_host and authz_user to be enabled for authentication.
• For the reverse proxy: proxy, and proxy_http must be enabled in Apache.
• Optional AppArmor changehat support provided (and accompanied AppArmor profiles for the web component in Apache and radicale itself.)

Apache configuration (/etc/apache2/conf.d/radicale.conf or equivalent)

ProxyPassMatch ((\.(ics|vcf))|((\.well-known\/)?(cal|card)dav)/)$ http://localhost:5232
<LocationMatch ((\.(ics|vcf))|((\.well-known\/)?(cal|card)dav)/)$>
   AuthType basic
   AuthName "Dovecot Authentication"
   AuthBasicProvider dovecot
   AuthDovecotAuthSocket /var/run/dovecot/auth-client
   AuthDovecotTimeout 5
   AuthDovecotAuthoritative On
   Require valid-user

   RewriteEngine On
   RewriteCond %{REMOTE_USER}%{REQUEST_URI} !^([^/]+/)\1
   RewriteCond %{REQUEST_URI} !^/.well-known/.+
   RewriteRule .* - [Forbidden]
   <IfModule security2_module>
      SecRuleEngine On
   </IfModule>
   <IfModule apparmor_module>
     AAHatName radicale
   </IfModule>
</LocationMatch>

Radicale configuration, relevant sections only (/etc/radicale/config)

[server]
hosts = 127.0.0.1:5232

[auth]
type = remote_user

[rights]
type = None

[storage]
filesystem_folder = /var/lib/radicale/collections

/etc/apparmor.d/usr.bin.radicale

/usr/bin/radicale {
  #include <abstractions/base>
  #include <abstractions/nameservice>
  #include <abstractions/python>



  /bin/dash rix,
  /etc/radicale/* r,
  /proc/*/mounts r,
  /run/radicale/* w,
  /sbin/ldconfig rix,
  /sbin/ldconfig.real rix,
  /usr/bin/python2.7 ix,
  /usr/bin/radicale r,
  /var/lib/radicale/** rw,
  /var/log/radicale/* w,

}

/etc/apparmor.d/apache2/radicale

^radicale {
  #include <abstractions/apache2-common>
  #include <abstractions/base>
  #include <abstractions/nameservice>

  # for log writing (could be abstracted)
  /var/log/apache2/*.log w,


}