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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a>
<span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a>
<span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a>
<span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a>
<span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<span class="sourceLineNo">011</span> *<a name="line.11"></a>
<span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a>
<span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a>
<span class="sourceLineNo">017</span> */<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.thrift;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.io.IOException;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.security.PrivilegedExceptionAction;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.Base64;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>import javax.servlet.ServletException;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import javax.servlet.http.HttpServletRequest;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import javax.servlet.http.HttpServletResponse;<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.security.SecurityUtil;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.apache.hadoop.security.UserGroupInformation;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.apache.hadoop.security.authorize.AuthorizationException;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.apache.hadoop.security.authorize.ProxyUsers;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import org.apache.http.HttpHeaders;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import org.apache.thrift.TProcessor;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import org.apache.thrift.protocol.TProtocolFactory;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import org.apache.thrift.server.TServlet;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import org.ietf.jgss.GSSContext;<a name="line.38"></a>
<span class="sourceLineNo">039</span>import org.ietf.jgss.GSSCredential;<a name="line.39"></a>
<span class="sourceLineNo">040</span>import org.ietf.jgss.GSSException;<a name="line.40"></a>
<span class="sourceLineNo">041</span>import org.ietf.jgss.GSSManager;<a name="line.41"></a>
<span class="sourceLineNo">042</span>import org.ietf.jgss.GSSName;<a name="line.42"></a>
<span class="sourceLineNo">043</span>import org.ietf.jgss.Oid;<a name="line.43"></a>
<span class="sourceLineNo">044</span>import org.slf4j.Logger;<a name="line.44"></a>
<span class="sourceLineNo">045</span>import org.slf4j.LoggerFactory;<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span>/**<a name="line.47"></a>
<span class="sourceLineNo">048</span> * Thrift Http Servlet is used for performing Kerberos authentication if security is enabled and<a name="line.48"></a>
<span class="sourceLineNo">049</span> * also used for setting the user specified in "doAs" parameter.<a name="line.49"></a>
<span class="sourceLineNo">050</span> */<a name="line.50"></a>
<span class="sourceLineNo">051</span>@InterfaceAudience.Private<a name="line.51"></a>
<span class="sourceLineNo">052</span>public class ThriftHttpServlet extends TServlet {<a name="line.52"></a>
<span class="sourceLineNo">053</span> private static final long serialVersionUID = 1L;<a name="line.53"></a>
<span class="sourceLineNo">054</span> private static final Logger LOG = LoggerFactory.getLogger(ThriftHttpServlet.class.getName());<a name="line.54"></a>
<span class="sourceLineNo">055</span> private final transient UserGroupInformation serviceUGI;<a name="line.55"></a>
<span class="sourceLineNo">056</span> private final transient UserGroupInformation httpUGI;<a name="line.56"></a>
<span class="sourceLineNo">057</span> private final transient HBaseServiceHandler handler;<a name="line.57"></a>
<span class="sourceLineNo">058</span> private final boolean doAsEnabled;<a name="line.58"></a>
<span class="sourceLineNo">059</span> private final boolean securityEnabled;<a name="line.59"></a>
<span class="sourceLineNo">060</span><a name="line.60"></a>
<span class="sourceLineNo">061</span> // HTTP Header related constants.<a name="line.61"></a>
<span class="sourceLineNo">062</span> public static final String NEGOTIATE = "Negotiate";<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span> public ThriftHttpServlet(TProcessor processor, TProtocolFactory protocolFactory,<a name="line.64"></a>
<span class="sourceLineNo">065</span> UserGroupInformation serviceUGI, UserGroupInformation httpUGI,<a name="line.65"></a>
<span class="sourceLineNo">066</span> HBaseServiceHandler handler, boolean securityEnabled, boolean doAsEnabled) {<a name="line.66"></a>
<span class="sourceLineNo">067</span> super(processor, protocolFactory);<a name="line.67"></a>
<span class="sourceLineNo">068</span> this.serviceUGI = serviceUGI;<a name="line.68"></a>
<span class="sourceLineNo">069</span> this.httpUGI = httpUGI;<a name="line.69"></a>
<span class="sourceLineNo">070</span> this.handler = handler;<a name="line.70"></a>
<span class="sourceLineNo">071</span> this.securityEnabled = securityEnabled;<a name="line.71"></a>
<span class="sourceLineNo">072</span> this.doAsEnabled = doAsEnabled;<a name="line.72"></a>
<span class="sourceLineNo">073</span> }<a name="line.73"></a>
<span class="sourceLineNo">074</span><a name="line.74"></a>
<span class="sourceLineNo">075</span> @Override<a name="line.75"></a>
<span class="sourceLineNo">076</span> protected void doPost(HttpServletRequest request, HttpServletResponse response)<a name="line.76"></a>
<span class="sourceLineNo">077</span> throws ServletException, IOException {<a name="line.77"></a>
<span class="sourceLineNo">078</span> String effectiveUser = request.getRemoteUser();<a name="line.78"></a>
<span class="sourceLineNo">079</span> if (securityEnabled) {<a name="line.79"></a>
<span class="sourceLineNo">080</span> /*<a name="line.80"></a>
<span class="sourceLineNo">081</span> Check that the AUTHORIZATION header has any content. If it does not then return a 401<a name="line.81"></a>
<span class="sourceLineNo">082</span> requesting AUTHORIZATION header to be sent. This is typical where the first request doesn't<a name="line.82"></a>
<span class="sourceLineNo">083</span> send the AUTHORIZATION header initially.<a name="line.83"></a>
<span class="sourceLineNo">084</span> */<a name="line.84"></a>
<span class="sourceLineNo">085</span> String authHeader = request.getHeader(HttpHeaders.AUTHORIZATION);<a name="line.85"></a>
<span class="sourceLineNo">086</span> if (authHeader == null || authHeader.isEmpty()) {<a name="line.86"></a>
<span class="sourceLineNo">087</span> // Send a 401 to the client<a name="line.87"></a>
<span class="sourceLineNo">088</span> response.addHeader(HttpHeaders.WWW_AUTHENTICATE, NEGOTIATE);<a name="line.88"></a>
<span class="sourceLineNo">089</span> response.sendError(HttpServletResponse.SC_UNAUTHORIZED);<a name="line.89"></a>
<span class="sourceLineNo">090</span> return;<a name="line.90"></a>
<span class="sourceLineNo">091</span> }<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span> try {<a name="line.93"></a>
<span class="sourceLineNo">094</span> // As Thrift HTTP transport doesn't support SPNEGO yet (THRIFT-889),<a name="line.94"></a>
<span class="sourceLineNo">095</span> // Kerberos authentication is being done at servlet level.<a name="line.95"></a>
<span class="sourceLineNo">096</span> final RemoteUserIdentity identity = doKerberosAuth(request);<a name="line.96"></a>
<span class="sourceLineNo">097</span> effectiveUser = identity.principal;<a name="line.97"></a>
<span class="sourceLineNo">098</span> // It is standard for client applications expect this header.<a name="line.98"></a>
<span class="sourceLineNo">099</span> // Please see http://tools.ietf.org/html/rfc4559 for more details.<a name="line.99"></a>
<span class="sourceLineNo">100</span> response.addHeader(HttpHeaders.WWW_AUTHENTICATE, NEGOTIATE + " " + identity.outToken);<a name="line.100"></a>
<span class="sourceLineNo">101</span> } catch (HttpAuthenticationException e) {<a name="line.101"></a>
<span class="sourceLineNo">102</span> LOG.error("Kerberos Authentication failed", e);<a name="line.102"></a>
<span class="sourceLineNo">103</span> // Send a 401 to the client<a name="line.103"></a>
<span class="sourceLineNo">104</span> response.addHeader(HttpHeaders.WWW_AUTHENTICATE, NEGOTIATE);<a name="line.104"></a>
<span class="sourceLineNo">105</span> response.sendError(HttpServletResponse.SC_UNAUTHORIZED,<a name="line.105"></a>
<span class="sourceLineNo">106</span> "Authentication Error: " + e.getMessage());<a name="line.106"></a>
<span class="sourceLineNo">107</span> return;<a name="line.107"></a>
<span class="sourceLineNo">108</span> }<a name="line.108"></a>
<span class="sourceLineNo">109</span> }<a name="line.109"></a>
<span class="sourceLineNo">110</span><a name="line.110"></a>
<span class="sourceLineNo">111</span> if(effectiveUser == null) {<a name="line.111"></a>
<span class="sourceLineNo">112</span> effectiveUser = serviceUGI.getShortUserName();<a name="line.112"></a>
<span class="sourceLineNo">113</span> }<a name="line.113"></a>
<span class="sourceLineNo">114</span><a name="line.114"></a>
<span class="sourceLineNo">115</span> String doAsUserFromQuery = request.getHeader("doAs");<a name="line.115"></a>
<span class="sourceLineNo">116</span> if (doAsUserFromQuery != null) {<a name="line.116"></a>
<span class="sourceLineNo">117</span> if (!doAsEnabled) {<a name="line.117"></a>
<span class="sourceLineNo">118</span> throw new ServletException("Support for proxyuser is not configured");<a name="line.118"></a>
<span class="sourceLineNo">119</span> }<a name="line.119"></a>
<span class="sourceLineNo">120</span> // The authenticated remote user is attempting to perform 'doAs' proxy user.<a name="line.120"></a>
<span class="sourceLineNo">121</span> UserGroupInformation remoteUser = UserGroupInformation.createRemoteUser(effectiveUser);<a name="line.121"></a>
<span class="sourceLineNo">122</span> // create and attempt to authorize a proxy user (the client is attempting<a name="line.122"></a>
<span class="sourceLineNo">123</span> // to do proxy user)<a name="line.123"></a>
<span class="sourceLineNo">124</span> UserGroupInformation ugi = UserGroupInformation.createProxyUser(doAsUserFromQuery,<a name="line.124"></a>
<span class="sourceLineNo">125</span> remoteUser);<a name="line.125"></a>
<span class="sourceLineNo">126</span> // validate the proxy user authorization<a name="line.126"></a>
<span class="sourceLineNo">127</span> try {<a name="line.127"></a>
<span class="sourceLineNo">128</span> ProxyUsers.authorize(ugi, request.getRemoteAddr());<a name="line.128"></a>
<span class="sourceLineNo">129</span> } catch (AuthorizationException e) {<a name="line.129"></a>
<span class="sourceLineNo">130</span> throw new ServletException(e);<a name="line.130"></a>
<span class="sourceLineNo">131</span> }<a name="line.131"></a>
<span class="sourceLineNo">132</span> effectiveUser = doAsUserFromQuery;<a name="line.132"></a>
<span class="sourceLineNo">133</span> }<a name="line.133"></a>
<span class="sourceLineNo">134</span> handler.setEffectiveUser(effectiveUser);<a name="line.134"></a>
<span class="sourceLineNo">135</span> super.doPost(request, response);<a name="line.135"></a>
<span class="sourceLineNo">136</span> }<a name="line.136"></a>
<span class="sourceLineNo">137</span><a name="line.137"></a>
<span class="sourceLineNo">138</span> /**<a name="line.138"></a>
<span class="sourceLineNo">139</span> * Do the GSS-API kerberos authentication.<a name="line.139"></a>
<span class="sourceLineNo">140</span> * We already have a logged in subject in the form of httpUGI,<a name="line.140"></a>
<span class="sourceLineNo">141</span> * which GSS-API will extract information from.<a name="line.141"></a>
<span class="sourceLineNo">142</span> */<a name="line.142"></a>
<span class="sourceLineNo">143</span> private RemoteUserIdentity doKerberosAuth(HttpServletRequest request)<a name="line.143"></a>
<span class="sourceLineNo">144</span> throws HttpAuthenticationException {<a name="line.144"></a>
<span class="sourceLineNo">145</span> HttpKerberosServerAction action = new HttpKerberosServerAction(request, httpUGI);<a name="line.145"></a>
<span class="sourceLineNo">146</span> try {<a name="line.146"></a>
<span class="sourceLineNo">147</span> String principal = httpUGI.doAs(action);<a name="line.147"></a>
<span class="sourceLineNo">148</span> return new RemoteUserIdentity(principal, action.outToken);<a name="line.148"></a>
<span class="sourceLineNo">149</span> } catch (Exception e) {<a name="line.149"></a>
<span class="sourceLineNo">150</span> LOG.info("Failed to authenticate with {} kerberos principal", httpUGI.getUserName());<a name="line.150"></a>
<span class="sourceLineNo">151</span> throw new HttpAuthenticationException(e);<a name="line.151"></a>
<span class="sourceLineNo">152</span> }<a name="line.152"></a>
<span class="sourceLineNo">153</span> }<a name="line.153"></a>
<span class="sourceLineNo">154</span><a name="line.154"></a>
<span class="sourceLineNo">155</span> /**<a name="line.155"></a>
<span class="sourceLineNo">156</span> * Basic "struct" class to hold the final base64-encoded, authenticated GSSAPI token<a name="line.156"></a>
<span class="sourceLineNo">157</span> * for the user with the given principal talking to the Thrift server.<a name="line.157"></a>
<span class="sourceLineNo">158</span> */<a name="line.158"></a>
<span class="sourceLineNo">159</span> private static class RemoteUserIdentity {<a name="line.159"></a>
<span class="sourceLineNo">160</span> final String outToken;<a name="line.160"></a>
<span class="sourceLineNo">161</span> final String principal;<a name="line.161"></a>
<span class="sourceLineNo">162</span><a name="line.162"></a>
<span class="sourceLineNo">163</span> RemoteUserIdentity(String principal, String outToken) {<a name="line.163"></a>
<span class="sourceLineNo">164</span> this.principal = principal;<a name="line.164"></a>
<span class="sourceLineNo">165</span> this.outToken = outToken;<a name="line.165"></a>
<span class="sourceLineNo">166</span> }<a name="line.166"></a>
<span class="sourceLineNo">167</span> }<a name="line.167"></a>
<span class="sourceLineNo">168</span><a name="line.168"></a>
<span class="sourceLineNo">169</span> private static class HttpKerberosServerAction implements PrivilegedExceptionAction&lt;String&gt; {<a name="line.169"></a>
<span class="sourceLineNo">170</span> final HttpServletRequest request;<a name="line.170"></a>
<span class="sourceLineNo">171</span> final UserGroupInformation httpUGI;<a name="line.171"></a>
<span class="sourceLineNo">172</span> String outToken = null;<a name="line.172"></a>
<span class="sourceLineNo">173</span> HttpKerberosServerAction(HttpServletRequest request, UserGroupInformation httpUGI) {<a name="line.173"></a>
<span class="sourceLineNo">174</span> this.request = request;<a name="line.174"></a>
<span class="sourceLineNo">175</span> this.httpUGI = httpUGI;<a name="line.175"></a>
<span class="sourceLineNo">176</span> }<a name="line.176"></a>
<span class="sourceLineNo">177</span><a name="line.177"></a>
<span class="sourceLineNo">178</span> @Override<a name="line.178"></a>
<span class="sourceLineNo">179</span> public String run() throws HttpAuthenticationException {<a name="line.179"></a>
<span class="sourceLineNo">180</span> // Get own Kerberos credentials for accepting connection<a name="line.180"></a>
<span class="sourceLineNo">181</span> GSSManager manager = GSSManager.getInstance();<a name="line.181"></a>
<span class="sourceLineNo">182</span> GSSContext gssContext = null;<a name="line.182"></a>
<span class="sourceLineNo">183</span> String serverPrincipal = SecurityUtil.getPrincipalWithoutRealm(httpUGI.getUserName());<a name="line.183"></a>
<span class="sourceLineNo">184</span> try {<a name="line.184"></a>
<span class="sourceLineNo">185</span> // This Oid for Kerberos GSS-API mechanism.<a name="line.185"></a>
<span class="sourceLineNo">186</span> Oid kerberosMechOid = new Oid("1.2.840.113554.1.2.2");<a name="line.186"></a>
<span class="sourceLineNo">187</span> // Oid for SPNego GSS-API mechanism.<a name="line.187"></a>
<span class="sourceLineNo">188</span> Oid spnegoMechOid = new Oid("1.3.6.1.5.5.2");<a name="line.188"></a>
<span class="sourceLineNo">189</span> // Oid for kerberos principal name<a name="line.189"></a>
<span class="sourceLineNo">190</span> Oid krb5PrincipalOid = new Oid("1.2.840.113554.1.2.2.1");<a name="line.190"></a>
<span class="sourceLineNo">191</span> // GSS name for server<a name="line.191"></a>
<span class="sourceLineNo">192</span> GSSName serverName = manager.createName(serverPrincipal, krb5PrincipalOid);<a name="line.192"></a>
<span class="sourceLineNo">193</span> // GSS credentials for server<a name="line.193"></a>
<span class="sourceLineNo">194</span> GSSCredential serverCreds = manager.createCredential(serverName,<a name="line.194"></a>
<span class="sourceLineNo">195</span> GSSCredential.DEFAULT_LIFETIME,<a name="line.195"></a>
<span class="sourceLineNo">196</span> new Oid[]{kerberosMechOid, spnegoMechOid},<a name="line.196"></a>
<span class="sourceLineNo">197</span> GSSCredential.ACCEPT_ONLY);<a name="line.197"></a>
<span class="sourceLineNo">198</span> // Create a GSS context<a name="line.198"></a>
<span class="sourceLineNo">199</span> gssContext = manager.createContext(serverCreds);<a name="line.199"></a>
<span class="sourceLineNo">200</span> // Get service ticket from the authorization header<a name="line.200"></a>
<span class="sourceLineNo">201</span> String serviceTicketBase64 = getAuthHeader(request);<a name="line.201"></a>
<span class="sourceLineNo">202</span> byte[] inToken = Base64.getDecoder().decode(serviceTicketBase64);<a name="line.202"></a>
<span class="sourceLineNo">203</span> byte[] res = gssContext.acceptSecContext(inToken, 0, inToken.length);<a name="line.203"></a>
<span class="sourceLineNo">204</span> if(res != null) {<a name="line.204"></a>
<span class="sourceLineNo">205</span> outToken = Base64.getEncoder().encodeToString(res).replace("\n", "");<a name="line.205"></a>
<span class="sourceLineNo">206</span> }<a name="line.206"></a>
<span class="sourceLineNo">207</span> // Authenticate or deny based on its context completion<a name="line.207"></a>
<span class="sourceLineNo">208</span> if (!gssContext.isEstablished()) {<a name="line.208"></a>
<span class="sourceLineNo">209</span> throw new HttpAuthenticationException("Kerberos authentication failed: " +<a name="line.209"></a>
<span class="sourceLineNo">210</span> "unable to establish context with the service ticket " +<a name="line.210"></a>
<span class="sourceLineNo">211</span> "provided by the client.");<a name="line.211"></a>
<span class="sourceLineNo">212</span> }<a name="line.212"></a>
<span class="sourceLineNo">213</span> return SecurityUtil.getUserFromPrincipal(gssContext.getSrcName().toString());<a name="line.213"></a>
<span class="sourceLineNo">214</span> } catch (GSSException e) {<a name="line.214"></a>
<span class="sourceLineNo">215</span> throw new HttpAuthenticationException("Kerberos authentication failed: ", e);<a name="line.215"></a>
<span class="sourceLineNo">216</span> } finally {<a name="line.216"></a>
<span class="sourceLineNo">217</span> if (gssContext != null) {<a name="line.217"></a>
<span class="sourceLineNo">218</span> try {<a name="line.218"></a>
<span class="sourceLineNo">219</span> gssContext.dispose();<a name="line.219"></a>
<span class="sourceLineNo">220</span> } catch (GSSException e) {<a name="line.220"></a>
<span class="sourceLineNo">221</span> LOG.warn("Error while disposing GSS Context", e);<a name="line.221"></a>
<span class="sourceLineNo">222</span> }<a name="line.222"></a>
<span class="sourceLineNo">223</span> }<a name="line.223"></a>
<span class="sourceLineNo">224</span> }<a name="line.224"></a>
<span class="sourceLineNo">225</span> }<a name="line.225"></a>
<span class="sourceLineNo">226</span><a name="line.226"></a>
<span class="sourceLineNo">227</span> /**<a name="line.227"></a>
<span class="sourceLineNo">228</span> * Returns the base64 encoded auth header payload<a name="line.228"></a>
<span class="sourceLineNo">229</span> *<a name="line.229"></a>
<span class="sourceLineNo">230</span> * @throws HttpAuthenticationException if a remote or network exception occurs<a name="line.230"></a>
<span class="sourceLineNo">231</span> */<a name="line.231"></a>
<span class="sourceLineNo">232</span> private String getAuthHeader(HttpServletRequest request)<a name="line.232"></a>
<span class="sourceLineNo">233</span> throws HttpAuthenticationException {<a name="line.233"></a>
<span class="sourceLineNo">234</span> String authHeader = request.getHeader(HttpHeaders.AUTHORIZATION);<a name="line.234"></a>
<span class="sourceLineNo">235</span> // Each http request must have an Authorization header<a name="line.235"></a>
<span class="sourceLineNo">236</span> if (authHeader == null || authHeader.isEmpty()) {<a name="line.236"></a>
<span class="sourceLineNo">237</span> throw new HttpAuthenticationException("Authorization header received " +<a name="line.237"></a>
<span class="sourceLineNo">238</span> "from the client is empty.");<a name="line.238"></a>
<span class="sourceLineNo">239</span> }<a name="line.239"></a>
<span class="sourceLineNo">240</span> String authHeaderBase64String;<a name="line.240"></a>
<span class="sourceLineNo">241</span> int beginIndex = (NEGOTIATE + " ").length();<a name="line.241"></a>
<span class="sourceLineNo">242</span> authHeaderBase64String = authHeader.substring(beginIndex);<a name="line.242"></a>
<span class="sourceLineNo">243</span> // Authorization header must have a payload<a name="line.243"></a>
<span class="sourceLineNo">244</span> if (authHeaderBase64String.isEmpty()) {<a name="line.244"></a>
<span class="sourceLineNo">245</span> throw new HttpAuthenticationException("Authorization header received " +<a name="line.245"></a>
<span class="sourceLineNo">246</span> "from the client does not contain any data.");<a name="line.246"></a>
<span class="sourceLineNo">247</span> }<a name="line.247"></a>
<span class="sourceLineNo">248</span> return authHeaderBase64String;<a name="line.248"></a>
<span class="sourceLineNo">249</span> }<a name="line.249"></a>
<span class="sourceLineNo">250</span> }<a name="line.250"></a>
<span class="sourceLineNo">251</span>}<a name="line.251"></a>
</pre>
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