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<h1 id="ssh-gateways">SSH Gateways<a class="headerlink" href="#ssh-gateways" title="Permanent link">&para;</a></h1>
<p>The purpose of the ssh gateways is to give temporary access to protected networks and resources. Users are only supposed to use <strong>ssh</strong> to connect to and from the gateways.</p>
<p>The access to the gateway is controlled by special ActiveDirectory groups. The membership of the groups are managed by the responsible of the protected network the gateway gives access to. In case of a beamline this is the beamline scientist.</p>
<p>Connecting to a gateway:</p>
<div class="language-bash highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>ssh<span class="w"> </span>&lt;gateway-name&gt;-gw
</span></code></pre></div>
<p>To avoid having to type your password to connect to the gateway you can upload your ssh public key to it. This can be done by:</p>
<div class="language-bash highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>ssh-copy-id<span class="w"> </span>&lt;gateway-name&gt;-gw
</span></code></pre></div>
<p>Afterwards you should be able to login to the gateway without a password.</p>
<p>Establishing an SSH connection through the gateway to a machine inside the protected network:</p>
<div class="language-bash highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>ssh<span class="w"> </span>-J<span class="w"> </span>&lt;gateway-name&gt;-gw<span class="w"> </span>&lt;name-of-the-machine-you-want-to-connect&gt;
</span></code></pre></div>
<p>If you need to connect/tunnel to/through specific ssh gateways frequently, you can add following configuration to your <code>~/.ssh/config</code> file. This will give you a persistent connection to the gateway that can be (re)used for multiple connections. (it the gateway requires MFS, this way you only have to authenticate once with)</p>
<p><div class="language-text highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a>Host GATEWAY
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a> HostName whatever-gw.psi.ch
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a> ControlMaster auto
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a> ControlPath ~/.ssh/mux-%r@%h:%p
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a> ControlPersist 8h
</span></code></pre></div>
(Replace GATEWAY, and whatever-gw.psi.ch with proper values)</p>
<p>Afterwards you can use </p>
<div class="language-bash highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a>ssh<span class="w"> </span>-J<span class="w"> </span>GATEWAY<span class="w"> </span>&lt;your-machine&gt;
</span></code></pre></div>
<p>to establish the connection.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Be aware, if you are switching networks this persistent connection might get screwed up. In that case you have to find the connection via <code>ps -ef</code> and kill it with the <code>kill</code> command.</p>
</div>
<h2 id="request-gateway-access">Request Gateway Access<a class="headerlink" href="#request-gateway-access" title="Permanent link">&para;</a></h2>
<p>Access to a Gateway can be requested via Service Now with the following workflow:</p>
<p>Open Service Now and <a href="https://psi.service-now.com/psisp">https://psi.service-now.com/psisp</a> and browse to the <strong>Request Gateway Access</strong> Workflow as follows:</p>
<p><img alt="" src="../_static/ssh_gateways_01.png" />
<img alt="" src="../_static/ssh_gateways_02.png" /></p>
<p>Alternatively you can search for "Gateway" in the search field.</p>
<p><img alt="" src="../_static/ssh_gateways_04.png" /></p>
<p>Afterwards specify the user and the Gateway you request access for:
<img alt="" src="../_static/ssh_gateways_03.png" /></p>
<p>Once the request is submitted the responsible person for the Gateway Access List will be informed and requested for approval. Once the Approval is given the user will be automatically added to the necessary AD group.</p>
<h2 id="remove-gateway-access">Remove Gateway Access<a class="headerlink" href="#remove-gateway-access" title="Permanent link">&para;</a></h2>
<p>Use the ServiceNow request: "Request Removal From Linux Group"
<a href="https://psi.service-now.com/psisp?id=psi_new_sc_cat_item&amp;sys_id=f1a86bb71b094e90d6a82f4aab4bcb87">https://psi.service-now.com/psisp?id=psi_new_sc_cat_item&amp;sys_id=f1a86bb71b094e90d6a82f4aab4bcb87</a></p>
<h2 id="using-ssh-gateways-with-windows">Using SSH Gateways with Windows<a class="headerlink" href="#using-ssh-gateways-with-windows" title="Permanent link">&para;</a></h2>
<ol>
<li>Open Command Prompt
Run CMD: Press Windows Key + R, type cmd, and press Enter.</li>
</ol>
<p>Alternatively, search for "Command Prompt" (“Eingabeaufforderung” in German) in the search bar and select it. </p>
<ol>
<li>Connecting to a Gateway</li>
</ol>
<div class="language-bash highlight"><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a>ssh<span class="w"> </span>&lt;username&gt;@&lt;gateway-name&gt;-gw
</span></code></pre></div>
<ol>
<li>Establish an SSH connection through the gateway to a machine inside the protected network</li>
</ol>
<div class="language-bash highlight"><pre><span></span><code><span id="__span-6-1"><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a>ssh<span class="w"> </span>-J<span class="w"> </span>&lt;username&gt;@&lt;gateway-name&gt;-gw<span class="w"> </span>&lt;username&gt;@&lt;name-of-the-machine-you-want-to-connect&gt;
</span></code></pre></div>
<h3 id="optional-save-the-connection-in-a-batch-file">Optional: Save the Connection in a Batch File<a class="headerlink" href="#optional-save-the-connection-in-a-batch-file" title="Permanent link">&para;</a></h3>
<p>Saving the Connection in a Batch Script let’s you re-use the command. This way you won’t have to retype it every time you use the same connection again.</p>
<p>Open Notepad:</p>
<ul>
<li>Press Windows Key + R, type <code>notepad</code>, and press <code>Enter</code>.</li>
<li>Type the SSH command, for example:
<div class="language-bash highlight"><pre><span></span><code><span id="__span-7-1"><a id="__codelineno-7-1" name="__codelineno-7-1" href="#__codelineno-7-1"></a>ssh<span class="w"> </span>-J<span class="w"> </span>&lt;username&gt;@&lt;gateway-name&gt;-gw<span class="w"> </span>&lt;username&gt;@&lt;name-of-the-machine-you-want-to-connect&gt;
</span></code></pre></div></li>
<li>Save the File as a Batch File: Click on File &gt; Save As.</li>
<li>Set the file name, e.g., connect-to-gateway.bat.</li>
<li>Choose "Save as type": Select All Files.</li>
<li>Ensure the file extension is .bat (e.g., connect-to-gateway.bat).</li>
<li>Save the file in a convenient location, such as your Desktop.</li>
</ul>
<p>Run the Batch File:</p>
<ul>
<li>Double-click the .bat file to execute the SSH command.</li>
</ul>
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