File apache2-README-access_compat.txt of Package Apache2
Dear System Administrator,
with apache 2.4, some changes have been introduced that affect apache's
access control scheme.
Previously, the directives "Allow", "Deny" and "Order" have determined
if access to a resource has been granted with apache 2.2.
Example (from /etc/apache2/httpd.conf, the main apache configuration file):
Deny from all
With 2.4, these directives have been replaced by the "Require" directive,
which is contained in the mod_authz_core module, and enhanced by the
"Require" understands several regulative groups, such as
env access granted if an apache environment variable is set
method access granted only for given HTTP methods (GET, POST, ...)
expr access granted if the expression following expr evaluates to true
user access granted if the named users can access the resource
group analogous to user for groups
valid-user access granted if a valid user requests it
ip access granted if the client's IP address matches
all granted unconditionally accepted/granted
all denied unconditionally denied access
By consequence, the set of 2.2 directives
Deny from all
can be translated to the apache 2.4 Require directive
Require all denied
The SUSE Linux Enterprise 12 package set for apache comes with a compatibility
module called mod_access_compat, which, if loaded, causes apache to understand
the 2.2 "Allow/Deny" directives. Unfortunately, the mixed usage of the
2.2 "Allow/Deny" and the 2.4 "Require" directive will lead to either unexpected
or inconclusive results. By consequence, one should decide if the 2.2 or the
2.4 access control mimics shall be used.
Fortunately, it is easy to switch from the new back to the old scheme:
will enable the 2.2 scheme,
a2enmod -d access_compat
will disable the old scheme again, thereby enabling the new scheme.
Of course, an apache restart is needed:
systemctl restart apache2
The SUSE apache configuration framework can work with both the new and the
old scheme, conditional if the access_compat apache module is loaded.
Additional pointers about the access controls new in apache 2.4 and about
the access_compat module can be found here: