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Subject cvs commit: httpd-2.0/docs/manual/mod mod_authnz_ldap.xml mod_authnz_ldap.xml.meta allmodules.xml
Date Fri, 20 Aug 2004 16:12:37 GMT
bnicholes    2004/08/20 09:12:37

  Modified:    docs/manual/mod allmodules.xml
  Added:       docs/manual/mod mod_authnz_ldap.xml mod_authnz_ldap.xml.meta
  Add the documentation for mod_authnz_ldap
  Revision  Changes    Path
  1.15      +1 -1      httpd-2.0/docs/manual/mod/allmodules.xml
  Index: allmodules.xml
  RCS file: /home/cvs/httpd-2.0/docs/manual/mod/allmodules.xml,v
  retrieving revision 1.14
  retrieving revision 1.15
  diff -u -r1.14 -r1.15
  --- allmodules.xml	26 May 2004 22:02:21 -0000	1.14
  +++ allmodules.xml	20 Aug 2004 16:12:37 -0000	1.15
  @@ -7,7 +7,7 @@
  -  <modulefile>mod_auth_ldap.xml</modulefile>
  +  <modulefile>mod_authnz_ldap.xml</modulefile>
  1.1                  httpd-2.0/docs/manual/mod/mod_authnz_ldap.xml
  Index: mod_authnz_ldap.xml
  <?xml version="1.0"?>
  <!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.dtd">
  <?xml-stylesheet type="text/xsl" href="../style/manual.en.xsl"?>
  <!-- $Revision: 1.1 $ -->
   Copyright 2002-2004 The Apache Software Foundation
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   See the License for the specific language governing permissions and
   limitations under the License.
  <modulesynopsis metafile="mod_authnz_ldap.xml.meta">
  <description>Allows an LDAP directory to be used to store the database
  for HTTP Basic authentication.</description>
  <compatibility>Available in version 2.1 and later</compatibility>
      <p>This module provides authentication front-ends such as
      <module>mod_auth_basic</module> to authenticate users through 
      an ldap directory.</p>
      <p><module>mod_authnz_ldap</module> supports the following features:</p>
        <li>Known to support the <a
        href="">OpenLDAP SDK</a> (both 1.x
        and 2.x), <a href="">
        Novell LDAP SDK</a> and the <a
        (Netscape)</a> SDK.</li>
        <li>Complex authorization policies can be implemented by
        representing the policy with LDAP filters.</li>
        <li>Uses extensive caching of LDAP operations via <a
        <li>Support for LDAP over SSL (requires the Netscape SDK) or
        TLS (requires the OpenLDAP 2.x SDK or Novell LDAP SDK).</li>
      <p>When using <module>mod_auth_basic</module>, this module is invoked
      via the <directive module="mod_auth_basic">AuthBasicProvider</directive>
      directive with the <code>ldap</code> value.</p>
  <section id="contents"><title>Contents</title>
          <a href="#operation">Operation</a> 
            <li><a href="#authenphase">The Authentication
            <li><a href="#authorphase">The Authorization
          <a href="#requiredirectives">The require Directives</a> 
            <li><a href="#reqvaliduser">require valid-user</a></li>
            <li><a href="#requser">require ldap-user</a></li>
            <li><a href="#reqgroup">require ldap-group</a></li>
            <li><a href="#reqdn">require ldap-dn</a></li>
        <li><a href="#examples">Examples</a></li>
        <li><a href="#usingtls">Using TLS</a></li>
        <li><a href="#usingssl">Using SSL</a></li>
          <a href="#frontpage">Using Microsoft FrontPage with
            <li><a href="#howitworks">How It Works</a></li>
            <li><a href="#fpcaveats">Caveats</a></li>
  <section id="operation"><title>Operation</title>
      <p>There are two phases in granting access to a user. The first
      phase is authentication, in which the <module>mod_authnz_ldap</module>
      authentication provider verifies that the user's credentials are valid. 
      This is also called the <em>search/bind</em> phase. The second phase is
      authorization, in which <module>mod_authnz_ldap</module> determines
      if the authenticated user is allowed access to the resource in
      question. This is also known as the <em>compare</em>
      <p><module>mod_authnz_ldap</module> registers both an authn_ldap authentication
      provider and an anthz_ldap authorization handler.  The authn_ldap
      authentication provider can be enabled through the 
      <directive module="mod_auth_basic">AuthBasicProvider</directive> directive

      using the <code>ldap</code> value. The authz_ldap handler extends the 
      <directive module="core">Require</directive> directive's authorization types
      by adding <code>ldap-user</code>, <code>ldap-dn</code> and <code>ldap-group</code>

  <section id="authenphase"><title>The Authentication
      <p>During the authentication phase, <module>mod_authnz_ldap</module>
      searches for an entry in the directory that matches the username
      that the HTTP client passes. If a single unique match is found,
      then <module>mod_authnz_ldap</module> attempts to bind to the
      directory server using the DN of the entry plus the password
      provided by the HTTP client. Because it does a search, then a
      bind, it is often referred to as the search/bind phase. Here are
      the steps taken during the search/bind phase.</p>
        <li>Generate a search filter by combining the attribute and
        filter provided in the <directive module="mod_authnz_ldap"
        >AuthLDAPURL</directive> directive with
        the username passed by the HTTP client.</li>
        <li>Search the directory using the generated filter. If the
        search does not return exactly one entry, deny or decline
        <li>Fetch the distinguished name of the entry retrieved from
        the search and attempt to bind to the LDAP server using the
        DN and the password passed by the HTTP client. If the bind is
        unsuccessful, deny or decline access.</li>
      <p>The following directives are used during the search/bind
        <columnspec><column width=".3"/><column width=".7"/></columnspec>
          <td><directive module="mod_authnz_ldap">AuthLDAPURL</directive></td>
          <td>Specifies the LDAP server, the
          base DN, the attribute to use in the search, as well as the
          extra search filter to use.</td>
          <td><directive module="mod_authnz_ldap">AuthLDAPBindDN</directive></td>
          <td>An optional DN to bind with
          during the search phase.</td>
          <td>An optional password to bind
          with during the search phase.</td>
  <section id="authorphase"><title>The Authorization Phase</title>
      <p>During the authorization phase, <module>mod_authnz_ldap</module>
      attempts to determine if the user is authorized to access the
      resource.  Many of these checks require
      <module>mod_authnz_ldap</module> to do a compare operation on the
      LDAP server. This is why this phase is often referred to as the
      compare phase. <module>mod_authnz_ldap</module> accepts the
      following <directive module="core">Require</directive>
      directives to determine if the credentials are acceptable:</p>
        <li>Grant access if there is a <a
        href="#reqgroup"><code>require ldap-user</code></a> directive,
and the
        username in the directive matches the username passed by the
        <li>Grant access if there is a <a href="#reqdn"><code>require
        ldap-dn</code></a> directive, and the DN in the directive matches
        the DN fetched from the LDAP directory.</li>
        <li>Grant access if there is a <a
        href="#reqgroup"><code>require ldap-group</code></a> directive,
        the DN fetched from the LDAP directory (or the username
        passed by the client) occurs in the LDAP group.</li>
        <li>otherwise, deny or decline access</li>
      <p>Other <directive module="core">Require</directive> values may also
      used which may require loading additional authorization modules.</p>
          <li>Grant access if there is a <a href="#requser"><code>require
          valid-user</code></a> directive. (requires 
          <li>Grant access if there is a <a
          href="#reqgroup"><code>require group</code></a> directive,
          <module>mod_authz_groupfile</module> has been loaded with the 
          <directive module="mod_authz_groupfile">AuthGroupFile</directive> 
          directive set.</li>
      <p><module>mod_authnz_ldap</module> uses the following directives
during the
      compare phase:</p>
        <columnspec><column width=".4"/><column width=".6"/></columnspec>
          <td><directive module="mod_authnz_ldap">AuthLDAPURL</directive>
          <td>The attribute specified in the
          URL is used in compare operations for the <code>require
          user</code> operation.</td>
          <td>Determines the behavior of the
          <code>require dn</code> directive.</td>
          <td>Determines the attribute to
          use for comparisons in the <code>require group</code>
          <td>Specifies whether to use the
          user DN or the username when doing comparisons for the
          <code>require group</code> directive.</td>
  <section id="requiredirectives"><title>The require Directives</title>
      <p>Apache's <directive module="core">Require</directive>
      directives are used during the authorization phase to ensure that
      a user is allowed to access a resource.  mod_authnz_ldap extends the 
      authorization types with <code>ldap-user</code>, <code>ldap-dn</code>

      and <code>ldap-group</code>.  Other authorization types may also be 
      used but may require that additional authorization modules be loaded.</p>
  <section id="reqvaliduser"><title>require valid-user</title>
      <p>If this directive exists, <module>mod_authnz_ldap</module> grants
      access to any user that has successfully authenticated during the
      search/bind phase.  Requires that <module>mod_authz_user</module> be 
      loaded and that the 
      <directive module="mod_authnz_ldap">AuthLDAPAuthoritative</directive>
      directive be set to off.</p>
  <section id="requser"><title>require ldap-user</title>
      <p>The <code>require ldap-user</code> directive specifies what
      usernames can access the resource. Once
      <module>mod_authnz_ldap</module> has retrieved a unique DN from the
      directory, it does an LDAP compare operation using the username
      specified in the <code>require ldap-user</code> to see if that username
      is part of the just-fetched LDAP entry.  Multiple users can be
      granted access by putting multiple usernames on the line,
      separated with spaces. If a username has a space in it, then it
      must be surrounded with double quotes. Multiple users can also be
      granted access by using multiple <code>require ldap-user</code>
      directives, with one user per line. For example, with a <directive
      module="mod_authnz_ldap">AuthLDAPURL</directive> of
      <code>ldap://ldap/o=Airius?cn</code> (i.e., <code>cn</code>
      used for searches), the following require directives could be used
      to restrict access:</p>
  require ldap-user "Barbara Jenson"<br />
  require ldap-user "Fred User"<br />
  require ldap-user "Joe Manager"<br />
      <p>Because of the way that <module>mod_authnz_ldap</module> handles
      directive, Barbara Jenson could sign on as <em>Barbara
      Jenson</em>, <em>Babs Jenson</em> or any other <code>cn</code>
      she has in her LDAP entry. Only the single <code>require
      ldap-user</code> line is needed to support all values of the attribute
      in the user's entry.</p>
      <p>If the <code>uid</code> attribute was used instead of the
      <code>cn</code> attribute in the URL above, the above three lines
      could be condensed to</p>
  <example>require ldap-user bjenson fuser jmanager</example>
  <section id="reqgroup"><title>require ldap-group</title>
      <p>This directive specifies an LDAP group whose members are
      allowed access. It takes the distinguished name of the LDAP
      group. Note: Do not surround the group name with quotes.
      For example, assume that the following entry existed in
      the LDAP directory:</p>
  dn: cn=Administrators, o=Airius<br />
  objectClass: groupOfUniqueNames<br />
  uniqueMember: cn=Barbara Jenson, o=Airius<br />
  uniqueMember: cn=Fred User, o=Airius<br />
      <p>The following directive would grant access to both Fred and
  <example>require ldap-group cn=Administrators, o=Airius</example>
      <p>Behavior of this directive is modified by the <directive
      module="mod_authnz_ldap">AuthLDAPGroupAttribute</directive> and
  <section id="reqdn"><title>require ldap-dn</title>
      <p>The <code>require ldap-dn</code> directive allows the administrator
      to grant access based on distinguished names. It specifies a DN
      that must match for access to be granted. If the distinguished
      name that was retrieved from the directory server matches the
      distinguished name in the <code>require ldap-dn</code>, then
      authorization is granted. Note: do not surround the distinguished
      name with quotes.</p>
      <p>The following directive would grant access to a specific
  <example>require ldap-dn cn=Barbara Jenson, o=Airius</example>
      <p>Behavior of this directive is modified by the <directive
  <section id="examples"><title>Examples</title>
          Grant access to anyone who exists in the LDAP directory,
          using their UID for searches. 
  AuthLDAPURL ldap://, o=Airius?uid?sub?(objectClass=*)<br
  require valid-user
          The next example is the same as above; but with the fields
          that have useful defaults omitted. Also, note the use of a
          redundant LDAP server. 
  <example>AuthLDAPURL ldap://, o=Airius<br
  require valid-user
          The next example is similar to the previous one, but is
          uses the common name instead of the UID. Note that this
          could be problematical if multiple people in the directory
          share the same <code>cn</code>, because a search on <code>cn</code>
          <strong>must</strong> return exactly one entry. That's why
          this approach is not recommended: it's a better idea to
          choose an attribute that is guaranteed unique in your
          directory, such as <code>uid</code>. 
  AuthLDAPURL ldap://, o=Airius?cn<br />
  require valid-user
          Grant access to anybody in the Administrators group. The
          users must authenticate using their UID. 
  AuthLDAPURL ldap://<br />
  require ldap-group cn=Administrators, o=Airius
          The next example assumes that everyone at Airius who
          carries an alphanumeric pager will have an LDAP attribute
          of <code>qpagePagerID</code>. The example will grant access
          only to people (authenticated via their UID) who have
          alphanumeric pagers: 
  AuthLDAPURL ldap://*)<br />
  require valid-user
          <p>The next example demonstrates the power of using filters
          to accomplish complicated administrative requirements.
          Without filters, it would have been necessary to create a
          new LDAP group and ensure that the group's members remain
          synchronized with the pager users. This becomes trivial
          with filters. The goal is to grant access to anyone who has
          a filter, plus grant access to Joe Manager, who doesn't
          have a pager, but does need to access the same
  AuthLDAPURL ldap://|(qpagePagerID=*)(uid=jmanager))<br
  require valid-user
          <p>This last may look confusing at first, so it helps to
          evaluate what the search filter will look like based on who
          connects, as shown below. The text in blue is the part that
          is filled in using the attribute specified in the URL. The
          text in red is the part that is filled in using the filter
          specified in the URL. The text in green is filled in using
          the information that is retrieved from the HTTP client. If
          Fred User connects as <code>fuser</code>, the filter would look
          <p>The above search will only succeed if <em>fuser</em> has a
          pager. When Joe Manager connects as <em>jmanager</em>, the
          filter looks like</p>
          <p>The above search will succeed whether <em>jmanager</em>
          has a pager or not.</p>
  <section id="usingtls"><title>Using TLS</title>
      <p>To use TLS, see the <module>mod_ldap</module> directives <directive
      module="mod_ldap">LDAPTrustedCA</directive> and <directive
  <section id="usingssl"><title>Using SSL</title>
      <p>To use SSL, see the <module>mod_ldap</module> directives <directive
      module="mod_ldap">LDAPTrustedCA</directive> and <directive
      <p>To specify a secure LDAP server, use <em>ldaps://</em> in the
      <directive module="mod_authnz_ldap">AuthLDAPURL</directive>
      directive, instead of <em>ldap://</em>.</p>
  <section id="frontpage"><title>Using Microsoft
      FrontPage with mod_authnz_ldap</title>
      <p>Normally, FrontPage uses FrontPage-web-specific user/group
      files (i.e., the <module>mod_authn_file</module> and
      <module>mod_authz_groupfile</module> modules) to handle all
      authentication. Unfortunately, it is not possible to just
      change to LDAP authentication by adding the proper directives,
      because it will break the <em>Permissions</em> forms in
      the FrontPage client, which attempt to modify the standard
      text-based authorization files.</p>
      <p>Once a FrontPage web has been created, adding LDAP
      authentication to it is a matter of adding the following
      directives to <em>every</em> <code>.htaccess</code> file
      that gets created in the web</p>
  AuthLDAPURL            "the url"
  AuthLDAPAuthoritative  off
  AuthGroupFile <em>mygroupfile</em>
  require group <em>mygroupfile</em>
      <p><directive module="mod_authnz_ldap">AuthLDAPAuthoritative</directive>

      must be off to allow <module>mod_authnz_ldap</module> to decline group
      authentication so that Apache will fall back to file
      authentication for checking group membership. This allows the
      FrontPage-managed group file to be used.</p>
  <section id="howitworks"><title>How It Works</title>
      <p>FrontPage restricts access to a web by adding the <code>require
      valid-user</code> directive to the <code>.htaccess</code>
      files. The <code>require valid-user</code> directive will succeed for
      any user who is valid <em>as far as LDAP is
      concerned</em>. This means that anybody who has an entry in
      the LDAP directory is considered a valid user, whereas FrontPage
      considers only those people in the local user file to be
      valid. By substituting the ldap-group with group file authorization,
      Apache is allowed to consult the local user file (which is managed by 
      FrontPage) - instead of LDAP - when handling authorizing the user.</p>
      <p>Once directives have been added as specified above,
      FrontPage users will be able to perform all management
      operations from the FrontPage client.</p>
  <section id="fpcaveats"><title>Caveats</title>
        <li>When choosing the LDAP URL, the attribute to use for
        authentication should be something that will also be valid
        for putting into a <module>mod_authn_file</module> user file.
        The user ID is ideal for this.</li>
        <li>When adding users via FrontPage, FrontPage administrators
        should choose usernames that already exist in the LDAP
        directory (for obvious reasons). Also, the password that the
        administrator enters into the form is ignored, since Apache
        will actually be authenticating against the password in the
        LDAP database, and not against the password in the local user
        file. This could cause confusion for web administrators.</li>
        <!-- XXX is that true? was mod_auth before the aaa change -->
        <li>Apache must be compiled with <module>mod_auth_basic</module>,
        <module>mod_authn_file</module> and
        <module>mod_authz_groupfile</module> in order to
        use FrontPage support. This is because Apache will still use
        the <module>mod_authz_groupfile</module> group file for determine 
        the extent of a user's access to the FrontPage web.</li>
        <li>The directives must be put in the <code>.htaccess</code>
        files. Attempting to put them inside <directive module="core"
        type="section">Location</directive> or <directive module="core"
        type="section">Directory</directive> directives won't work. This
        is because <module>mod_authnz_ldap</module> has to be able to grab
        the <directive module="mod_authn_file">AuthGroupFile</directive>
        directive that is found in FrontPage <code>.htaccess</code>
        files so that it knows where to look for the valid user list. If
        the <module>mod_authnz_ldap</module> directives aren't in the same
        <code>.htaccess</code> file as the FrontPage directives, then
        the hack won't work, because <module>mod_authnz_ldap</module> will
        never get a chance to process the <code>.htaccess</code> file,
        and won't be able to find the FrontPage-managed user file.</li>
  <description>Prevent other authentication modules from
  authenticating the user if this one fails</description>
  <syntax>AuthLDAPAuthoritative on|off</syntax>
  <default>AuthLDAPAuthoritative on</default>
      <p>Set to <code>off</code> if this module should let other
      authentication modules attempt to authenticate the user, should
      authentication with this module fail. Control is only passed on
      to lower modules if there is no DN or rule that matches the
      supplied user name (as passed by the client).</p>
  <description>Optional DN to use in binding to the LDAP server</description>
  <syntax>AuthLDAPBindDN <em>distinguished-name</em></syntax>
      <p>An optional DN used to bind to the server when searching for
      entries. If not provided, <module>mod_authnz_ldap</module> will use
      an anonymous bind.</p>
  <description>Password used in conjuction with the bind DN</description>
  <syntax>AuthLDAPBindPassword <em>password</em></syntax>
      <p>A bind password to use in conjunction with the bind DN. Note
      that the bind password is probably sensitive data, and should be
      properly protected. You should only use the <directive
      module="mod_authnz_ldap">AuthLDAPBindDN</directive> and <directive
      module="mod_authnz_ldap">AuthLDAPBindPassword</directive> if you
      absolutely need them to search the directory.</p> 
  <description>Language to charset conversion configuration file</description>
  <syntax>AuthLDAPCharsetConfig <em>file-path</em></syntax>
  <contextlist><context>server config</context>
      <p>The <directive>AuthLDAPCharsetConfig</directive> directive sets
the location
      of the language to charset conversion configuration file. <var>File-path</var>
is relative
      to the <directive module="core">ServerRoot</directive>. This file specifies
      the list of language extensions to character sets.
      Most administrators use the provided <code>charset.conv</code>
      file, which associates common language extensions to character sets.</p>
      <p>The file contains lines in the following format:</p>
        <var>Language-Extension</var> <var>charset</var> [<var>Language-String</var>]
      <p>The case of the extension does not matter. Blank lines, and lines
      beginning with a hash character (<code>#</code>) are ignored.</p>
  <description>Use the LDAP server to compare the DNs</description>
  <syntax>AuthLDAPCompareDNOnServer on|off</syntax>
  <default>AuthLDAPCompareDNOnServer on</default>
      <p>When set, <module>mod_authnz_ldap</module> will use the LDAP
      server to compare the DNs. This is the only foolproof way to
      compare DNs.  <module>mod_authnz_ldap</module> will search the
      directory for the DN specified with the <a
      href="#reqdn"><code>require dn</code></a> directive, then,
      retrieve the DN and compare it with the DN retrieved from the user
      entry. If this directive is not set,
      <module>mod_authnz_ldap</module> simply does a string comparison. It
      is possible to get false negatives with this approach, but it is
      much faster. Note the <module>mod_ldap</module> cache can speed up
      DN comparison in most situations.</p>
  <description>When will the module de-reference aliases</description>
  <syntax>AuthLDAPDereferenceAliases never|searching|finding|always</syntax>
  <default>AuthLDAPDereferenceAliases Always</default>
      <p>This directive specifies when <module>mod_authnz_ldap</module>
      de-reference aliases during LDAP operations. The default is
  <description>LDAP attributes used to check for group membership</description>
  <syntax>AuthLDAPGroupAttribute <em>attribute</em></syntax>
      <p>This directive specifies which LDAP attributes are used to
      check for group membership. Multiple attributes can be used by
      specifying this directive multiple times. If not specified,
      then <module>mod_authnz_ldap</module> uses the <code>member</code>
      <code>uniquemember</code> attributes.</p>
  <description>Use the DN of the client username when checking for
  group membership</description>
  <syntax>AuthLDAPGroupAttributeIsDN on|off</syntax>
  <default>AuthLDAPGroupAttributeIsDN on</default>
      <p>When set <code>on</code>, this directive says to use the
      distinguished name of the client username when checking for group
      membership.  Otherwise, the username will be used. For example,
      assume that the client sent the username <code>bjenson</code>,
      which corresponds to the LDAP DN <code>cn=Babs Jenson,
      o=Airius</code>. If this directive is set,
      <module>mod_authnz_ldap</module> will check if the group has
      <code>cn=Babs Jenson, o=Airius</code> as a member. If this
      directive is not set, then <module>mod_authnz_ldap</module> will
      check if the group has <code>bjenson</code> as a member.</p>
  <description>Use the DN of the client username to set the REMOTE_USER
  environment variable</description>
  <syntax>AuthLDAPRemoteUserIsDN on|off</syntax>
  <default>AuthLDAPRemoteUserIsDN off</default>
      <p>If this directive is set to on, the value of the
      <code>REMOTE_USER</code> environment variable will be set to the full
      distinguished name of the authenticated user, rather than just
      the username that was passed by the client. It is turned off by
  <description>URL specifying the LDAP search parameters</description>
  <syntax>AuthLDAPUrl <em>url</em></syntax>
      <p>An RFC 2255 URL which specifies the LDAP search parameters
      to use. The syntax of the URL is</p>
          <dd>For regular ldap, use the
          string <code>ldap</code>. For secure LDAP, use <code>ldaps</code>
          instead. Secure LDAP is only available if Apache was linked
          to an LDAP library with SSL support.</dd>
            <p>The name/port of the ldap server (defaults to
            <code>localhost:389</code> for <code>ldap</code>, and
            <code>localhost:636</code> for <code>ldaps</code>). To
            specify multiple, redundant LDAP servers, just list all
            servers, separated by spaces. <module>mod_authnz_ldap</module>
            will try connecting to each server in turn, until it makes a
            successful connection.</p>
            <p>Once a connection has been made to a server, that
            connection remains active for the life of the
            <code>httpd</code> process, or until the LDAP server goes
            <p>If the LDAP server goes down and breaks an existing
            connection, <module>mod_authnz_ldap</module> will attempt to
            re-connect, starting with the primary server, and trying
            each redundant server in turn. Note that this is different
            than a true round-robin search.</p>
          <dd>The DN of the branch of the
          directory where all searches should start from. At the very
          least, this must be the top of your directory tree, but
          could also specify a subtree in the directory.</dd>
          <dd>The attribute to search for.
          Although RFC 2255 allows a comma-separated list of
          attributes, only the first attribute will be used, no
          matter how many are provided. If no attributes are
          provided, the default is to use <code>uid</code>. It's a good
          idea to choose an attribute that will be unique across all
          entries in the subtree you will be using.</dd>
          <dd>The scope of the search. Can be either <code>one</code> or
          <code>sub</code>. Note that a scope of <code>base</code>
          also supported by RFC 2255, but is not supported by this
          module. If the scope is not provided, or if <code>base</code> scope
          is specified, the default is to use a scope of
          <dd>A valid LDAP search filter. If
          not provided, defaults to <code>(objectClass=*)</code>, which
          will search for all objects in the tree. Filters are
          limited to approximately 8000 characters (the definition of
          <code>MAX_STRING_LEN</code> in the Apache source code). This
          should be than sufficient for any application.</dd>
      <p>When doing searches, the attribute, filter and username passed
      by the HTTP client are combined to create a search filter that
      looks like
      <p>For example, consider an URL of
      <code>ldap://*)</code>. When
      a client attempts to connect using a username of <code>Babs
      Jenson</code>, the resulting search filter will be
      <code>(&amp;(posixid=*)(cn=Babs Jenson))</code>.</p>
      <p>See above for examples of <directive
      module="mod_authnz_ldap">AuthLDAPURL</directive> URLs.</p>
  1.1                  httpd-2.0/docs/manual/mod/mod_authnz_ldap.xml.meta
  Index: mod_authnz_ldap.xml.meta
  <?xml version="1.0" encoding="UTF-8" ?>

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