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<!doctype html>
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<html lang="de">
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<meta charset="utf-8">
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<title>Einführung in Linux</title>
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<meta name="description" content="YALC - Yet Another Linux Course ">
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<meta name="author" content="Daniel Schubert">
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<meta name="apple-mobile-web-app-capable" content="yes">
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<link rel="stylesheet" href="css/theme/league.css" id="theme">
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link.rel = 'stylesheet';
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link.type = 'text/css';
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link.href = window.location.search.match( /print-pdf/gi ) ? 'css/print/pdf.css' : 'css/print/paper.css';
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<style type="text/css">
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.reveal img{ max-height: 60vh}
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</style>
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</head>
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<body>
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<div class="reveal">
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<!-- Any section element inside of this container is displayed as a slide -->
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<div class="slides">
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<section data-transition="slide" data-background="#4d7e65" data-background-transition="zoom">
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<h1>LINUX</h1>
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<h3>Das universelle Betriebssystem</h3>
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<p>Eine Einführung - Teil 10
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<p> <small>Deutsche Angestellten Akademie</small> </p>
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<aside class="notes">
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Frage: Fragen zur letzten Stunde?
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</aside>
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</section>
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<section data-transition="slide" data-background="#b5533c" data-background-transition="convex">
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<h3>ssh</h3>
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SSH ermöglicht eine <span class="fragment highlight-green">sichere, authentifizierte und verschlüsselte</span> Verbindung zwischen zwei Rechnern über ein unsicheres Netzwerk.
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</section>
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<section style="font-size: .7em">
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<div>
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<p ><strong style="text-decoration: underline ">Secure System Administration (Sichere Systemverwaltung)</strong style="text-decoration: underline ">
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zur Absicherung der Fernverwaltung von Servern.
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Secure Application Tunneling (Sicheres Tunneln)
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zum transparenten Schutz TCP/IP-basierender Anwendungen als „End-to-End-Security“.</div>
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<div class="fragment">
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<p ><strong style="text-decoration: underline ">Secure Remote Command Execution (Sichere Ausführung von Kommandos)</strong style="text-decoration: underline ">
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zur Ausführung einzelner Kommandos auf einem anderen Rechner. Dabei werden stdin, stdout und stderr transparent weitergeleitet. Sonderfall davon:
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</div>
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<div class="fragment">
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<p><strong style="text-decoration: underline ">Secure Subsystem Execution (Sichere Ausführung von Subsystemen)</strong style="text-decoration: underline ">
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zur Ausführung von auf dem Server vordefinierter Kommandos, wobei stderr jedoch nicht weitergeleitet wird.
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Beispiel: Secure File Transfer (Sicherer Dateitransfer)
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zur Herstellung sicherer, automatisierter und interaktiver Dateitransfers.
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</div>
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</section>
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<section>
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<img src="img/how-does-ssh-protocol-work-920x272-SWKuhzNV.png">
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</section>
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<section>
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<h4>Funktionsweise</h4>
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<ul>
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<li class="fragment ">Server identifiziert sich mit Zertifikat</li>
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<li class="fragment ">Client authentisiert sich mit Passwort od. Zertifikat</li>
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<li class="fragment ">geheimer Schlüssel wird erzeugt für die Sitzung</li>
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<li class="fragment ">Datenverkehr wird mit diesem Schlüssel verschlüsselt übertragen</li>
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</ul>
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</section>
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<section>
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<h4>Programme</h4>
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<ul>
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<li class="fragment ">ssh -> ...</li>
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<li class="fragment ">scp -> Dateien über ssh kopieren</li>
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<li class="fragment ">ssh-keygen -> Schlüssel erstellen</li>
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<li class="fragment ">ssh-copy-id -> Schlüssel austauschen</li>
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<li class="fragment ">sshd -> der ssh-Server</li>
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</ul>
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</section>
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<section>
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<h4>Verwendung</h4>
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<ul>
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<li class="fragment ">systemweite client Konfiguration: <code>/etc/ssh/ssh_config</code> </li>
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<li class="fragment "><pre><code class="bash">~$ ssh [ -p port ] [user@]host</code></pre></li>
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<li class="fragment ">Wird kein User angegeben, nimmt ssh aktuellen User.</li>
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<li class="fragment "><pre><code class="bash">~$ ssh -p 1234 root@omikron.net</code></pre></li>
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<li class="fragment "><pre><code class="bash">~$ ssh ::1</code></pre></li>
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</ul>
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</section>
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<section>
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<h4>Verwendung mit ssh-Keys</h4>
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<ol>
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<li class="fragment ">Schlüsselpaar generieren:<br> <code>ssh-keygen -b 4096</code></li>
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<li class="fragment ">öffentlichen Schlüssel zum Server kopieren:<br> <code>scp neuer-super-key.pub user@server.de</code></li>
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<li class="fragment ">Beim Server anmelden: <code>ssh user@server.de</code></li>
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<li class="fragment "><pre><code class="bash">
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$ mkdir ~/.ssh
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$ cat ~/neuer-super-key.pub >> ~/.ssh/authorized_keys
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$ rm ~/neuer-super-key.pub
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$ chmod 600 ~/.ssh/authorized_keys</code></pre></li>
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</ol>
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<p>nun ist Anmeldung mit Key möglich.
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</section>
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<section>
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<h4>Begriffe</h4>
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<table style="font-size: .6em">
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<tr>
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<td>SSH Key</td>
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<td>ersetzt Passwort</td>
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</tr>
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<tr>
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<td>authorized keys</td>
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<td>öffentliche Schlüssel die Zugriff erlauben ( Analogie: Schloß, das vom zugehörigen privaten Schl. geöffnet werden kann.)</td>
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</tr>
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<tr>
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<td>identity key</td>
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<td>Privater Schlüssel, den SSH verwendet um den client zu authentisieren</td>
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</tr>
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<tr>
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<td>host key</td>
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<td>öffentlicher SSH-Schlüssel des Servers</td>
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</tr>
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<tr>
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<td>Session Key</td>
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<td>wird von den Kommunikations Partner ausgehandelt; verschlüsselt Daten während Übertragung</td>
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</tr>
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</table>
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</section>
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<section>
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</section>
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<section>
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<span style="color: orange">Aufgabe:</span>
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<ul>
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<li> erstellt ein script, welches Serverseitig ein Datenbank und File Backup erstellt</li>
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<li> erstellt ein script, welches Serverseitig ein Datenbank und File Backup erstellt</li>
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<li>Erstellt ein script, welches diese Backups mit rsync herunterlädt</li>
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<li>Erstellt einen Cron-Job der das wöchentlich macht</li>
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</ul>
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<p>Hinweise:
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</section>
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</div>
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</div>
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<script src="lib/js/head.min.js"></script>
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<script src="js/reveal.js"></script>
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<script>
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// More info https://github.com/hakimel/reveal.js#configuration
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Reveal.initialize({
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history: true,
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center: true,
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transition: 'slide', // none/fade/slide/convex/concave/zoom
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// More info https://github.com/hakimel/reveal.js#dependencies
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dependencies: [
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{ src: 'plugin/notes/notes.js', async: true }
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]
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});
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</script>
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</body>
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</html>
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