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<p class="apache">Apache HTTP Server Version 2.2</p>
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<div class="retired"><h4>Please note</h4>
<p> This document refers to a legacy release (<strong>2.2</strong>) of Apache httpd. The active release (<strong>2.4</strong>) is documented <a href="http://httpd.apache.org/docs/current">here</a>. If you have not already upgraded, please follow <a href="http://httpd.apache.org/docs/current/upgrading.html">this link</a> for more information.</p>
<p>You may follow <a href="http://httpd.apache.org/docs/current/mod/mod_proxy_ftp.html">this link</a> to go to the current version of this document.</p></div><div id="preamble"><h1>Apache Module mod_proxy_ftp</h1>
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<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_ftp.html" title="English"> en </a> |
<a href="../ja/mod/mod_proxy_ftp.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a></p>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>FTP support module for
<code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>proxy_ftp_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_proxy_ftp.c</td></tr></table>
<h3>Summary</h3>
<p>This module <em>requires</em> the service of <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>. It provides support for the proxying
FTP sites. Note that FTP support is currently limited to
the GET method.</p>
<p>Thus, in order to get the ability of handling FTP proxy requests,
<code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> and <code class="module"><a href="../mod/mod_proxy_ftp.html">mod_proxy_ftp</a></code>
have to be present in the server.</p>
<div class="warning"><h3>Warning</h3>
<p>Do not enable proxying until you have <a href="mod_proxy.html#access">secured your server</a>. Open proxy
servers are dangerous both to your network and to the Internet at
large.</p>
</div>
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<div id="quickview"><h3>Topics</h3>
<ul id="topics">
<li><img alt="" src="../images/down.gif" /> <a href="#mimetypes">Why doesn't file type <var>xxx</var>
download via FTP?</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#type">How can I force an FTP ASCII download of
File <var>xxx</var>?</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#ftpnonget">How can I do FTP upload?</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#percent2fhck">How can I access FTP files outside
of my home directory?</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#ftppass">How can I hide the FTP cleartext password
in my browser's URL line?</a></li>
</ul><h3 class="directives">Directives</h3>
<p>This module provides no
directives.</p>
<h3>See also</h3>
<ul class="seealso">
<li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li>
</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="mimetypes" id="mimetypes">Why doesn't file type <var>xxx</var>
download via FTP?</a></h2>
<p>You probably don't have that particular file type defined as
<code>application/octet-stream</code> in your proxy's mime.types
configuration file. A useful line can be</p>
<div class="example"><pre>application/octet-stream bin dms lha lzh exe class tgz taz</pre></div>
<p>Alternatively you may prefer to default everything to binary:</p>
<div class="example"><pre>DefaultType application/octet-stream</pre></div>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="type" id="type">How can I force an FTP ASCII download of
File <var>xxx</var>?</a></h2>
<p>In the rare situation where you must download a specific file using the
FTP <code>ASCII</code> transfer method (while the default transfer is in
<code>binary</code> mode), you can override <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>'s
default by suffixing the request with <code>;type=a</code> to force an
ASCII transfer. (FTP Directory listings are always executed in ASCII mode,
however.)</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="ftpnonget" id="ftpnonget">How can I do FTP upload?</a></h2>
<p>Currently, only GET is supported for FTP in mod_proxy. You can
of course use HTTP upload (POST or PUT) through an Apache proxy.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="percent2fhck" id="percent2fhck">How can I access FTP files outside
of my home directory?</a></h2>
<p>An FTP URI is interpreted relative to the home directory of the user
who is logging in. Alas, to reach higher directory levels you cannot
use /../, as the dots are interpreted by the browser and not actually
sent to the FTP server. To address this problem, the so called <dfn>Squid
%2f hack</dfn> was implemented in the Apache FTP proxy; it is a
solution which is also used by other popular proxy servers like the <a href="http://www.squid-cache.org/">Squid Proxy Cache</a>. By
prepending <code>/%2f</code> to the path of your request, you can make
such a proxy change the FTP starting directory to <code>/</code> (instead
of the home directory). For example, to retrieve the file
<code>/etc/motd</code>, you would use the URL:</p>
<div class="example"><p><code>
ftp://<var>user</var>@<var>host</var>/%2f/etc/motd
</code></p></div>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="ftppass" id="ftppass">How can I hide the FTP cleartext password
in my browser's URL line?</a></h2>
<p>To log in to an FTP server by username and password, Apache uses
different strategies. In absense of a user name and password in the URL
altogether, Apache sends an anonymous login to the FTP server,
<em>i.e.</em>,</p>
<div class="example"><p><code>
user: anonymous<br />
password: apache_proxy@
</code></p></div>
<p>This works for all popular FTP servers which are configured for
anonymous access.</p>
<p>For a personal login with a specific username, you can embed the user
name into the URL, like in:</p>
<div class="example"><p><code>
ftp://<var>username</var>@<var>host</var>/myfile
</code></p></div>
<p>If the FTP server asks for a password when given this username (which
it should), then Apache will reply with a <code>401</code> (Authorization
required) response, which causes the Browser to pop up the
username/password dialog. Upon entering the password, the connection
attempt is retried, and if successful, the requested resource is
presented. The advantage of this procedure is that your browser does not
display the password in cleartext (which it would if you had used</p>
<div class="example"><p><code>
ftp://<var>username</var>:<var>password</var>@<var>host</var>/myfile
</code></p></div>
<p>in the first place).</p>
<div class="note"><h3>Note</h3>
<p>The password which is transmitted in such a way is not encrypted on
its way. It travels between your browser and the Apache proxy server in
a base64-encoded cleartext string, and between the Apache proxy and the
FTP server as plaintext. You should therefore think twice before
accessing your FTP server via HTTP (or before accessing your personal
files via FTP at all!) When using insecure channels, an eavesdropper
might intercept your password on its way.</p>
</div>
</div>
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