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<?xml version="1.0"?>
<!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.dtd">
<?xml-stylesheet type="text/xsl" href="../style/manual.xsl"?>
<modulesynopsis>
<name>mod_auth</name>
<description>User authentication using text files</description>
<status>Base</status>
<sourcefile>mod_auth.c</sourcefile>
<identifier>auth_module</identifier>
<summary>
<p>This module allows the use of HTTP Basic Authentication to
restrict access by looking up users in plain text password and
group files. Similar functionality and greater scalability is
provided by <module>mod_auth_dbm</module>. HTTP Digest
Authentication is provided by
<module>mod_auth_digest</module>.</p>
</summary>
<seealso><directive module="core">Require</directive></seealso>
<seealso><directive module="core">Satisfy</directive></seealso>
<seealso><directive module="core">AuthName</directive></seealso>
<seealso><directive module="core">AuthType</directive></seealso>
<directivesynopsis>
<name>AuthGroupFile</name>
<description>Sets the name of a text file containing the list
of user groups for authentication</description>
<syntax>AuthGroupFile <em>file-path</em></syntax>
<contextlist><context>directory</context><context>.htaccess</context>
</contextlist>
<override>AuthConfig</override>
<usage>
<p>The <directive>AuthGroupFile</directive> directive sets the
name of a textual file containing the list of user groups for user
authentication. <em>File-path</em> is the path to the group
file. If it is not absolute (<em>i.e.</em>, if it doesn't begin
with a slash), it is treated as relative to the <directive
module="core">ServerRoot</directive>.</p>
<p>Each line of the group file contains a groupname followed by a
colon, followed by the member usernames separated by spaces.
Example:</p>
<example>mygroup: bob joe anne</example>
<p>Note that searching large text files is <em>very</em>
inefficient; <directive
module="mod_auth_dbm">AuthDBMGroupFile</directive> should be used
instead.</p>
<note><title>Security</title>
<p>Make sure that the AuthGroupFile is stored outside
the document tree of the web-server; do <em>not</em> put it in
the directory that it protects. Otherwise, clients will be able
to download the AuthGroupFile.</p>
</note>
</usage>
</directivesynopsis>
<directivesynopsis>
<name>AuthUserFile</name>
<description>Sets the name of a text file containing the list of users and
passwords for authentication</description>
<syntax>AuthUserFile <em>file-path</em></syntax>
<contextlist><context>directory</context><context>.htaccess</context>
</contextlist>
<override>AuthConfig</override>
<usage>
<p>The <directive>AuthUserFile</directive> directive sets the name
of a textual file containing the list of users and passwords for
user authentication. <em>File-path</em> is the path to the user
file. If it is not absolute (<em>i.e.</em>, if it doesn't begin
with a slash), it is treated as relative to the <directive
module="core">ServerRoot</directive>.</p>
<p>Each line of the user file file contains a username followed by
a colon, followed by the <code>crypt()</code> encrypted
password. The behavior of multiple occurrences of the same user is
undefined.</p>
<p>The utility <a href="../programs/htpasswd.html">htpasswd</a>
which is installed as part of the binary distribution, or which
can be found in <code>src/support</code>, is used to maintain
this password file. See the <code>man</code> page for more
details. In short:</p>
<p>Create a password file 'Filename' with 'username' as the
initial ID. It will prompt for the password:</p>
<example>htpasswd -c Filename username</example>
<p>Adds or modifies in password file 'Filename' the 'username':</p>
<example>htpasswd Filename username2</example>
<p>Note that searching large text files is <em>very</em>
inefficient; <directive
module="mod_auth_dbm">AuthDBMUserFile</directive> should be used
instead.</p>
<note><title>Security</title><p>Make sure that the AuthUserFile is
stored outside the document tree of the web-server; do <em>not</em>
put it in the directory that it protects. Otherwise, clients will be
able to download the AuthUserFile.</p></note>
</usage>
</directivesynopsis>
<directivesynopsis>
<name>AuthAuthoritative</name>
<description>Sets whether authorization and authentication are
passed to lower level modules</description>
<syntax>AuthAuthoritative on|off</syntax>
<default>AuthAuthoritative on</default>
<contextlist><context>directory</context><context>.htaccess</context>
</contextlist>
<override>AuthConfig</override>
<usage>
<note>This information has not been updated for Apache 2.0, which
uses a different system for module ordering.</note>
<p>Setting the <directive>AuthAuthoritative</directive> directive
explicitly to <strong>'off'</strong> allows for both
authentication and authorization to be passed on to lower level
modules (as defined in the <code>Configuration</code> and
<code>modules.c</code> files) if there is <strong>no
userID</strong> or <strong>rule</strong> matching the supplied
userID. If there is a userID and/or rule specified; the usual
password and access checks will be applied and a failure will give
an Authorization Required reply.</p>
<p>So if a userID appears in the database of more than one module;
or if a valid <directive module="core">Require</directive>
directive applies to more than one module; then the first module
will verify the credentials; and no access is passed on;
regardless of the AuthAuthoritative setting.</p>
<p>A common use for this is in conjunction with one of the
database modules; such as <module>auth_dbm</module>,
<code>mod_auth_msql</code>, and <module>mod_auth_anon</module>.
These modules supply the bulk of the user credential checking; but
a few (administrator) related accesses fall through to a lower
level with a well protected <directive
module="mod_auth">AuthUserFile</directive>.</p>
<p>By default; control is not passed on; and an unknown userID or
rule will result in an Authorization Required reply. Not setting
it thus keeps the system secure; and forces an NCSA compliant
behaviour.</p>
<note><title>Security</title> Do consider the implications of
allowing a user to allow fall-through in his .htaccess file; and
verify that this is really what you want; Generally it is easier
to just secure a single .htpasswd file, than it is to secure a
database such as mSQL. Make sure that the <directive
module="mod_auth">AuthUserFile</directive> is stored outside the
document tree of the web-server; do <em>not</em> put it in the
directory that it protects. Otherwise, clients will be able to
download the <directive module="mod_auth">AuthUserFile</directive>.
</note>
</usage>
</directivesynopsis>
</modulesynopsis>
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