251 lines
7.9 KiB
HTML
251 lines
7.9 KiB
HTML
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
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<head>
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<title></title>
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<!-- 2018-03-10 Sat 20:54 -->
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<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
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<meta name="generator" content="Org-mode" />
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<meta name="author" content="Bob Mottram" />
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<meta name="description" content="Improving security"
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/>
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<meta name="keywords" content="freedombone, security, ssh, debian, beaglebone" />
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<style type="text/css">
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<!--/*--><![CDATA[/*><!--*/
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.title { text-align: center; }
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padding: 2px; font-size: 80%; font-weight: normal; }
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.center { margin-left: auto; margin-right: auto; text-align: center; }
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.underline { text-decoration: underline; }
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#postamble p, #preamble p { font-size: 90%; margin: .2em; }
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p.verse { margin-left: 3%; }
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pre {
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border: 1px solid #ccc;
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box-shadow: 3px 3px 3px #eee;
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padding: 8pt;
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font-family: monospace;
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overflow: auto;
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margin: 1.2em;
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}
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pre.src {
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position: relative;
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overflow: visible;
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padding-top: 1.2em;
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}
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pre.src:before {
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display: none;
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position: absolute;
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background-color: white;
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top: -10px;
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right: 10px;
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padding: 3px;
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border: 1px solid black;
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}
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pre.src:hover:before { display: inline;}
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pre.src-sh:before { content: 'sh'; }
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pre.src-bash:before { content: 'sh'; }
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pre.src-emacs-lisp:before { content: 'Emacs Lisp'; }
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pre.src-R:before { content: 'R'; }
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pre.src-perl:before { content: 'Perl'; }
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pre.src-java:before { content: 'Java'; }
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pre.src-sql:before { content: 'SQL'; }
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table { border-collapse:collapse; }
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caption.t-above { caption-side: top; }
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caption.t-bottom { caption-side: bottom; }
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td, th { vertical-align:top; }
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th.right { text-align: center; }
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th.left { text-align: center; }
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th.center { text-align: center; }
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td.right { text-align: right; }
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td.left { text-align: left; }
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td.center { text-align: center; }
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dt { font-weight: bold; }
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.footpara:nth-child(2) { display: inline; }
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.footpara { display: block; }
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.footdef { margin-bottom: 1em; }
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.figure { padding: 1em; }
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.figure p { text-align: center; }
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.inlinetask {
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padding: 10px;
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border: 2px solid gray;
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margin: 10px;
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background: #ffffcc;
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}
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#org-div-home-and-up
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{ text-align: right; font-size: 70%; white-space: nowrap; }
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textarea { overflow-x: auto; }
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.linenr { font-size: smaller }
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.code-highlighted { background-color: #ffff00; }
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.org-info-js_info-navigation { border-style: none; }
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#org-info-js_console-label
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{ font-size: 10px; font-weight: bold; white-space: nowrap; }
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.org-info-js_search-highlight
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{ background-color: #ffff00; color: #000000; font-weight: bold; }
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/*]]>*/-->
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</style>
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<link rel="stylesheet" type="text/css" href="freedombone.css" />
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<script type="text/javascript">
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/*
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@licstart The following is the entire license notice for the
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JavaScript code in this tag.
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Copyright (C) 2012-2013 Free Software Foundation, Inc.
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The JavaScript code in this tag is free software: you can
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redistribute it and/or modify it under the terms of the GNU
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General Public License (GNU GPL) as published by the Free Software
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Foundation, either version 3 of the License, or (at your option)
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any later version. The code is distributed WITHOUT ANY WARRANTY;
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without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU GPL for more details.
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As additional permission under GNU GPL version 3 section 7, you
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may distribute non-source (e.g., minimized or compacted) forms of
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that code without the copy of the GNU GPL normally required by
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section 4, provided you include this license notice and a URL
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through which recipients can access the Corresponding Source.
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@licend The above is the entire license notice
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for the JavaScript code in this tag.
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*/
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<!--/*--><![CDATA[/*><!--*/
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function CodeHighlightOn(elem, id)
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{
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var target = document.getElementById(id);
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if(null != target) {
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elem.cacheClassElem = elem.className;
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elem.cacheClassTarget = target.className;
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target.className = "code-highlighted";
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elem.className = "code-highlighted";
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}
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}
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function CodeHighlightOff(elem, id)
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{
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var target = document.getElementById(id);
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if(elem.cacheClassElem)
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elem.className = elem.cacheClassElem;
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if(elem.cacheClassTarget)
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target.className = elem.cacheClassTarget;
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}
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/*]]>*///-->
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</script>
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</head>
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<body>
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<div id="preamble" class="status">
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<a name="top" id="top"></a>
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</div>
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<div id="content">
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<h1 class="title"></h1>
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<div class="center">
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<div class="figure">
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<p><img src="images/logo.png" alt="logo.png" />
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</p>
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</div>
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</div>
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<div id="outline-container-sec-1" class="outline-2">
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<h2 id="sec-1">Authentication with keys</h2>
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<div class="outline-text-2" id="text-1">
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<p>
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It's a lot more secure to log in to the Freedombone system using ssh keys rather than with a password. You can set that up by first running:
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</p>
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<div class="org-src-container">
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<pre class="src src-bash">freedombone-client
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</pre>
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</div>
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<p>
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On your local system (i.e. whatever you're logging in to the Freedombone system from, typically a laptop). Then:
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</p>
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<pre class="example">
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ssh myusername@freedombone.local -p 2222
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</pre>
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<p>
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Select <b>Administrator controls</b> and re-enter your password, then <b>Manage Users</b> and <b>Change user ssh public key</b>. Copy and paste the ssh public keys which appeared after the <b>freedombone-client</b> command was run. Then go to <b>Security settings</b> and select <b>Allow ssh login with passwords</b> followed by <b>no</b>.
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</p>
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<p>
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You'll need to make sure that you have a copy of the ~/.ssh directory on your local system. You could just copy that directory to a USB drive and then keep that somewhere safe so that you can restore the keys if you need to.
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</p>
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</div>
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</div>
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<div id="outline-container-sec-2" class="outline-2">
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<h2 id="sec-2">Administrating the system via an onion address (Tor)</h2>
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<div class="outline-text-2" id="text-2">
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<p>
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You can also access your system via the Tor system using an onion address. To find out what the onion address for ssh access is you can do the following:
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</p>
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<div class="org-src-container">
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<pre class="src src-bash">ssh username@freedombone.local -p 2222
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</pre>
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</div>
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<p>
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Select <i>Administrator controls</i> then select "About this system" and look for the onion address for ssh. You can then close the terminal and open another, then do the following on your local system:
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</p>
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<div class="org-src-container">
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<pre class="src src-bash">freedombone-client
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</pre>
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</div>
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<p>
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This will set up your ssh environment to be able to handle onion addresses. Then you can test ssh with:
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</p>
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<div class="org-src-container">
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<pre class="src src-bash">ssh username@address.onion -p 2222
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</pre>
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</div>
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<p>
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Subsequently even if dynamic DNS isn't working you may still be able to administer your system. Using the onion address also gives you some degree of protection against corporate or government metadata analysis, since it becomes more difficult to passively detect which systems are communicating.
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</p>
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</div>
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</div>
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</div>
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<div id="postamble" class="status">
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<style type="text/css">
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.back-to-top {
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position: fixed;
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bottom: 2em;
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right: 0px;
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text-decoration: none;
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color: #000000;
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background-color: rgba(235, 235, 235, 0.80);
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font-size: 12px;
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padding: 1em;
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display: none;
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}
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.back-to-top:hover {
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background-color: rgba(135, 135, 135, 0.50);
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}
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</style>
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<div class="back-to-top">
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<a href="#top">Back to top</a> | <a href="mailto:bob@freedombone.net">E-mail me</a>
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</div>
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</div>
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</body>
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</html>
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