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| <title>mod_proxy_ftp - Apache HTTP Server</title> |
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| <div id="page-content"> |
| <div id="preamble"><h1>Apache Module mod_proxy_ftp</h1> |
| <div class="toplang"> |
| <p><span>Available Languages: </span><a href="../en/mod/mod_proxy_ftp.html" title="English"> en </a></p> |
| </div> |
| <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>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> |
| </div> |
| <div id="quickview"><h3 class="directives">Directives</h3> |
| <p>This module provides no |
| directives.</p> |
| <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>See also</h3> |
| <ul class="seealso"> |
| <li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></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 unsecure channels, an eavesdropper |
| might intercept your password on its way.</p> |
| </div> |
| </div> |
| </div> |
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| <p><span>Available Languages: </span><a href="../en/mod/mod_proxy_ftp.html" title="English"> en </a></p> |
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