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<h2>Hadoop HDFS over HTTP 2.3.0 - Using HTTP Tools<a name="Hadoop_HDFS_over_HTTP_2.3.0_-_Using_HTTP_Tools"></a></h2>
<p>[ <a href="./index.html">Go Back</a> ]</p>
<div class="section">
<h3>Security<a name="Security"></a></h3>
<p>Out of the box HttpFS supports both pseudo authentication and Kerberos HTTP SPNEGO authentication.</p>
<div class="section">
<h4>Pseudo Authentication<a name="Pseudo_Authentication"></a></h4>
<p>With pseudo authentication the user name must be specified in the <tt>user.name=&lt;USERNAME&gt;</tt> query string parameter of a HttpFS URL. For example:</p>
<div class="source">
<pre>$ curl &quot;http://&lt;HTTFS_HOST&gt;:14000/webhdfs/v1?op=homedir&amp;user.name=babu&quot;</pre></div></div>
<div class="section">
<h4>Kerberos HTTP SPNEGO Authentication<a name="Kerberos_HTTP_SPNEGO_Authentication"></a></h4>
<p>Kerberos HTTP SPNEGO authentication requires a tool or library supporting Kerberos HTTP SPNEGO protocol.</p>
<p>IMPORTANT: If using <tt>curl</tt>, the <tt>curl</tt> version being used must support GSS (<tt>curl -V</tt> prints out 'GSS' if it supports it).</p>
<p>For example:</p>
<div class="source">
<pre>$ kinit
Please enter the password for tucu@LOCALHOST:
$ curl --negotiate -u foo &quot;http://&lt;HTTPFS_HOST&gt;:14000/webhdfs/v1?op=homedir&quot;
Enter host password for user 'foo':</pre></div>
<p>NOTE: the <tt>-u USER</tt> option is required by the <tt>--negotiate</tt> but it is not used. Use any value as <tt>USER</tt> and when asked for the password press [ENTER] as the password value is ignored.</p></div>
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<h4><a name="Remembering_Who_I_Am">Remembering Who I Am</a> (Establishing an Authenticated Session)<a name="Remembering_Who_I_Am_Establishing_an_Authenticated_Session"></a></h4>
<p>As most authentication mechanisms, Hadoop HTTP authentication authenticates users once and issues a short-lived authentication token to be presented in subsequent requests. This authentication token is a signed HTTP Cookie.</p>
<p>When using tools like <tt>curl</tt>, the authentication token must be stored on the first request doing authentication, and submitted in subsequent requests. To do this with curl the <tt>-b</tt> and <tt>-c</tt> options to save and send HTTP Cookies must be used.</p>
<p>For example, the first request doing authentication should save the received HTTP Cookies.</p>
<p>Using Pseudo Authentication:</p>
<div class="source">
<pre>$ curl -c ~/.httpfsauth &quot;http://&lt;HTTPFS_HOST&gt;:14000/webhdfs/v1?op=homedir&amp;user.name=babu&quot;</pre></div>
<p>Using Kerberos HTTP SPNEGO authentication:</p>
<div class="source">
<pre>$ curl --negotiate -u foo -c ~/.httpfsauth &quot;http://&lt;HTTPFS_HOST&gt;:14000/webhdfs/v1?op=homedir&quot;</pre></div>
<p>Then, subsequent requests forward the previously received HTTP Cookie:</p>
<div class="source">
<pre>$ curl -b ~/.httpfsauth &quot;http://&lt;HTTPFS_HOST&gt;:14000/webhdfs/v1?op=liststatus&quot;</pre></div>
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