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<modulesynopsis metafile="mod_authn_core.xml.meta">

<name>mod_authn_core</name>
<description>Core Authentication</description>
<status>Base</status>
<sourcefile>mod_authn_core.c</sourcefile>
<identifier>authn_core_module</identifier>
<compatibility>Available in Apache 2.3 and later</compatibility>

<summary>
    <p>This module provides core authentication capabilities to
    allow or deny access to portions of the web site.
    <module>mod_authn_core</module> provides directives that are
    common to all authentication providers.</p>
</summary>

<section id="authnalias"><title>Creating Authentication Provider Aliases</title>

    <p>Extended authentication providers can be created
    within the configuration file and assigned an alias name.  The alias
    providers can then be referenced through the directives
    <directive module="mod_auth_basic">AuthBasicProvider</directive> or
    <directive module="mod_auth_digest">AuthDigestProvider</directive> in
    the same way as a base authentication provider.  Besides the ability
    to create and alias an extended provider, it also allows the same
    extended authentication provider to be reference by multiple
    locations.</p>

    <section id="example"><title>Examples</title>

        <p>This example checks for passwords in two different text
        files.</p>

        <example><title>Checking multiple text password files</title>
        <highlight language="config">
# Check here first
&lt;AuthnProviderAlias file file1&gt;
    AuthUserFile "/www/conf/passwords1"
&lt;/AuthnProviderAlias&gt;

# Then check here
&lt;AuthnProviderAlias file file2&gt;   
    AuthUserFile "/www/conf/passwords2"
&lt;/AuthnProviderAlias&gt;

&lt;Directory "/var/web/pages/secure"&gt;
    AuthBasicProvider file1 file2
    
    AuthType Basic
    AuthName "Protected Area"
    Require valid-user
&lt;/Directory&gt;
        </highlight>
        </example>

        <p>The example below creates two different ldap authentication
        provider aliases based on the ldap provider.  This allows
        a single authenticated location to be serviced by multiple ldap
        hosts:</p>

        <example><title>Checking multiple LDAP servers</title>
        <highlight language="config">
&lt;AuthnProviderAlias ldap ldap-alias1&gt;
    AuthLDAPBindDN cn=youruser,o=ctx
    AuthLDAPBindPassword yourpassword
    AuthLDAPURL ldap://ldap.host/o=ctx
&lt;/AuthnProviderAlias&gt;
&lt;AuthnProviderAlias ldap ldap-other-alias&gt;
    AuthLDAPBindDN cn=yourotheruser,o=dev
    AuthLDAPBindPassword yourotherpassword
    AuthLDAPURL ldap://other.ldap.host/o=dev?cn
&lt;/AuthnProviderAlias&gt;

Alias "/secure" "/webpages/secure"
&lt;Directory "/webpages/secure"&gt;
    AuthBasicProvider ldap-other-alias  ldap-alias1
    
    AuthType Basic
    AuthName "LDAP Protected Place"
    Require valid-user
    # Note that Require ldap-* would not work here, since the 
    # AuthnProviderAlias does not provide the config to authorization providers
    # that are implemented in the same module as the authentication provider.
&lt;/Directory&gt;
          </highlight>
        </example>
    </section>

</section>


<directivesynopsis>
<name>AuthName</name>
<description>Authorization realm for use in HTTP
authentication</description>
<syntax>AuthName <var>auth-domain</var></syntax>
<contextlist><context>directory</context><context>.htaccess</context>
</contextlist>
<override>AuthConfig</override>

<usage>
    <p>This directive sets the name of the authorization realm for a
    directory. This realm is given to the client so that the user
    knows which username and password to send.
    <directive>AuthName</directive> takes a single argument; if the
    realm name contains spaces, it must be enclosed in quotation
    marks.  It must be accompanied by <directive
    module="mod_authn_core">AuthType</directive> and <directive
    module="mod_authz_core">Require</directive> directives, and directives such
    as <directive module="mod_authn_file">AuthUserFile</directive> and
    <directive module="mod_authz_groupfile">AuthGroupFile</directive> to
    work.</p>

   <p>For example:</p>

   <highlight language="config">
     AuthName "Top Secret"
   </highlight>

    <p>The string provided for the <code>AuthName</code> is what will
    appear in the password dialog provided by most browsers.</p>
</usage>
<seealso><a
    href="../howto/auth.html">Authentication, Authorization, and
    Access Control</a></seealso>
<seealso><module>mod_authz_core</module></seealso>
</directivesynopsis>

<directivesynopsis>
<name>AuthType</name>
<description>Type of user authentication</description>
<syntax>AuthType None|Basic|Digest|Form</syntax>
<contextlist><context>directory</context><context>.htaccess</context>
</contextlist>
<override>AuthConfig</override>

<usage>
    <p>This directive selects the type of user authentication for a
    directory. The authentication types available are <code>None</code>,
    <code>Basic</code> (implemented by
    <module>mod_auth_basic</module>), <code>Digest</code>
    (implemented by <module>mod_auth_digest</module>), and
    <code>Form</code> (implemented by <module>mod_auth_form</module>).</p>

    <p>To implement authentication, you must also use the <directive
    module="mod_authn_core">AuthName</directive> and <directive
    module="mod_authz_core">Require</directive> directives.  In addition, the
    server must have an authentication-provider module such as
    <module>mod_authn_file</module> and an authorization module such
    as <module>mod_authz_user</module>.</p>

    <p>The authentication type <code>None</code> disables authentication.
    When authentication is enabled, it is normally inherited by each
    subsequent <a href="../sections.html#mergin">configuration section</a>,
    unless a different authentication type is specified.  If no
    authentication is desired for a subsection of an authenticated
    section, the authentication type <code>None</code> may be used;
    in the following example, clients may access the
    <code>/www/docs/public</code> directory without authenticating:</p>

    <highlight language="config">
&lt;Directory "/www/docs"&gt;
    AuthType Basic
    AuthName Documents
    AuthBasicProvider file
    AuthUserFile "/usr/local/apache/passwd/passwords"
    Require valid-user
&lt;/Directory&gt;

&lt;Directory "/www/docs/public"&gt;
    AuthType None
    Require all granted
&lt;/Directory&gt;
    </highlight>

    <note>When disabling authentication, note that clients which have
    already authenticated against another portion of the server's document
    tree will typically continue to send authentication HTTP headers
    or cookies with each request, regardless of whether the server
    actually requires authentication for every resource.</note>
</usage>

<seealso><a href="../howto/auth.html">Authentication, Authorization,
    and Access Control</a></seealso>
</directivesynopsis>

<directivesynopsis type="section">
<name>AuthnProviderAlias</name>
<description>Enclose a group of directives that represent an
extension of a base authentication provider and referenced by
the specified alias</description>
<syntax>&lt;AuthnProviderAlias <var>baseProvider Alias</var>&gt;
... &lt;/AuthnProviderAlias&gt;</syntax>
<contextlist><context>server config</context>
</contextlist>

<usage>
    <p><code>&lt;AuthnProviderAlias&gt;</code> and
    <code>&lt;/AuthnProviderAlias&gt;</code> are used to enclose a group of
    authentication directives that can be referenced by the alias name
    using one of the directives <directive module="mod_auth_basic">
    AuthBasicProvider</directive> or <directive module="mod_auth_digest">
    AuthDigestProvider</directive>.</p>

    <note>This directive has no affect on authorization, even for modules that
    provide both authentication and authorization.</note>
</usage>
</directivesynopsis>

</modulesynopsis>
