apache/docs/manual/mod/mod_auth_basic.xml

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

<name>mod_auth_basic</name>
<description>Basic HTTP authentication</description>
<status>Base</status>
<sourcefile>mod_auth_basic.c</sourcefile>
<identifier>auth_basic_module</identifier>

<summary>
    <p>This module allows the use of HTTP Basic Authentication to
    restrict access by looking up users in the given providers.
    HTTP Digest Authentication is provided by
    <module>mod_auth_digest</module>.  This module should
    usually be combined with at least one authentication module
    such as <module>mod_authn_file</module> and one authorization
    module such as <module>mod_authz_user</module>.</p>
</summary>
<seealso><directive module="mod_authn_core">AuthName</directive></seealso>
<seealso><directive module="mod_authn_core">AuthType</directive></seealso>
<seealso><directive module="mod_authz_core">Require</directive></seealso>
<seealso><a href="../howto/auth.html">Authentication howto</a></seealso>

<directivesynopsis>
<name>AuthBasicProvider</name>
<description>Sets the authentication provider(s) for this location</description>
<syntax>AuthBasicProvider <var>provider-name</var>
[<var>provider-name</var>] ...</syntax>
<default>AuthBasicProvider file</default>
<contextlist><context>directory</context><context>.htaccess</context>
</contextlist>
<override>AuthConfig</override>

<usage>
    <p>The <directive>AuthBasicProvider</directive> directive sets
    which provider is used to authenticate the users for this location.
    The default <code>file</code> provider is implemented
    by the <module>mod_authn_file</module> module.  Make sure
    that the chosen provider module is present in the server.</p>
    <example><title>Example</title>
    <highlight language="config">
&lt;Location /secure&gt;
    AuthType basic
    AuthName "private area"
    AuthBasicProvider  dbm
    AuthDBMType        SDBM
    AuthDBMUserFile    /www/etc/dbmpasswd
    Require            valid-user
&lt;/Location&gt;
    </highlight>
    </example>
    <p> Providers are queried in order until a provider finds a match
    for the requested username, at which point this sole provider will
    attempt to check the password.  A failure to verify the password does
    not result in control being passed on to subsequent providers.</p>

    <p>Providers are implemented by <module>mod_authn_dbm</module>,
    <module>mod_authn_file</module>, <module>mod_authn_dbd</module>,
    <module>mod_authnz_ldap</module> and <module>mod_authn_socache</module>.</p>
</usage>
</directivesynopsis>

<directivesynopsis>
<name>AuthBasicAuthoritative</name>
<description>Sets whether authorization and authentication are passed to
lower level modules</description>
<syntax>AuthBasicAuthoritative On|Off</syntax>
<default>AuthBasicAuthoritative On</default>
<contextlist><context>directory</context><context>.htaccess</context>
</contextlist>
<override>AuthConfig</override>

<usage>
    <p>Normally, each authorization module listed in <directive
    module="mod_auth_basic">AuthBasicProvider</directive> will attempt
    to verify the user, and if the user is not found in any provider,
    access will be denied. Setting the
    <directive>AuthBasicAuthoritative</directive> directive explicitly
    to <code>Off</code> allows for both authentication and
    authorization to be passed on to other non-provider-based modules
    if there is <strong>no userID</strong> or <strong>rule</strong>
    matching the supplied userID.  This should only be necessary when
    combining <module>mod_auth_basic</module> with third-party modules
    that are not configured with the <directive
    module="mod_auth_basic">AuthBasicProvider</directive>
    directive.  When using such modules, the order of processing
    is determined in the modules' source code and is not configurable.</p>
</usage>
</directivesynopsis>

<directivesynopsis>
<name>AuthBasicFake</name>
<description>Fake basic authentication using the given expressions for
username and password</description>
<syntax>AuthBasicFake off|username [password]</syntax>
<default>none</default>
<contextlist><context>directory</context><context>.htaccess</context>
</contextlist>
<override>AuthConfig</override>

<usage>
    <p>The username and password specified are combined into an
    Authorization header, which is passed to the server or service
    behind the webserver. Both the username and password fields are
    interpreted using the <a href="../expr.html">expression parser</a>,
    which allows both the username and password to be set based on
    request parameters.</p>

    <p>If the password is not specified, the default value "password"
    will be used. To disable fake basic authentication for an URL
    space, specify "AuthBasicFake off".</p>

    <p>In this example, we pass a fixed username and password to a
    backend server.</p>

    <example><title>Fixed Example</title>
    <highlight language="config">
&lt;Location /demo&gt;
    AuthBasicFake demo demopass
&lt;/Location&gt;
    </highlight>
    </example>

    <p>In this example, we pass the email address extracted from a client
    certificate, extending the functionality of the FakeBasicAuth option
    within the <directive module="mod_ssl">SSLOptions</directive>
    directive. Like the FakeBasicAuth option, the password is set to the
    fixed string "password".</p>

    <example><title>Certificate Example</title>
    <highlight language="config">
&lt;Location /secure&gt;
    AuthBasicFake %{SSL_CLIENT_S_DN_Email}
&lt;/Location&gt;
    </highlight>
    </example>

    <p>Extending the above example, we generate a password by hashing the
    email address with a fixed passphrase, and passing the hash to the
    backend server. This can be used to gate into legacy systems that do
    not support client certificates.</p>

    <example><title>Password Example</title>
    <highlight language="config">
&lt;Location /secure&gt;
    AuthBasicFake %{SSL_CLIENT_S_DN_Email} %{sha1:passphrase-%{SSL_CLIENT_S_DN_Email}}
&lt;/Location&gt;
    </highlight>
    </example>

    <example><title>Exclusion Example</title>
    <highlight language="config">
&lt;Location /public&gt;
    AuthBasicFake off
&lt;/Location&gt;
    </highlight>
    </example>

</usage>
</directivesynopsis>

</modulesynopsis>