Firewalls durchbohren mit OpenSSH

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In diesem Vortrag möchte ich ein Verständnis für Sicherheitslücken vermitteln, damit Sie sich schützen können.</td> </tr> </table> <h1>Inhalt</h1> <ol type="1"> <li><a href="#ToC1"><strong>Motivation</strong></a></li> <li><a href="#ToC2"><strong>Offene Ports benutzen</strong></a></li> <li><a href="#ToC3"><strong>Vorhandene Proxyserver benutzen</strong></a> <ol type="a"> <li><a href="#ToC4"><strong>ssh over http</strong></a> <ol type="i"> <li><a href="#ToC5"><strong>httptunnel</strong></a></li> </ol> </li> <li><a href="#ToC6"><strong>ssh over https</strong></a> <ol type="i"> <li><a href="#ToC7"><strong>ssh-https-tunnel</strong></a></li> <li><a href="#ToC8"><strong>transconnect</strong></a></li> <li><a href="#ToC9"><strong>proxytunnel</strong></a></li> </ol> </li> </ol> </li> <li><a href="#ToC10"><strong>Empfehlungen</strong></a></li> <li><a href="#ToC11"><strong>Weiterführendes</strong></a></li> </ol> <h1><a name="ToC1">Motivation</a></h1> ssh-Verbindungen stellen für Firmen ein enormes Risiko dar, schließlich können darüber Tunnels an Virenscannern und Logfiles vorbei gelegt und Dateien übertragen werden. <p align="center"><img src="ssh/vorbei.png" width="640" alt="" height="113" /></p> <p>Viele Firmen haben daher auf ihren Routern oder Firewalls den Zugriff auf Port 22 aller Internetteilnehmer verboten. Da heute jedoch praktisch kein Unternehmen auf einen Internetanschluß verzichten kann, bestehen meist doch gewisse Löcher in der Firewall. Im Folgenden zeige ich, wie man diese entdeckt und eine ssh-Verbindung darüber aufbaut.</p> <p>Mit den Kenntnissen aus <a href="ssh2.de.html" target="_parent">Teil 2</a> (insb. ppp-over-ssh) ist es damit trivial, beliebige IP-Verbindungen durch nahezu jede Firewall zu betreiben.</p> <div class="pagebreak"> </div>  <h1><a name="ToC2">Offene Ports benutzen</a></h1> Zunächst sollte man prüfen, welche Ports die Firewall immer durchlässt. Ich verwende hierzu den <kbd>nmap</kbd>-Portscanner von <a href="http://www.nmap.org" target="_blank">www.nmap.org</a>:<br /> <div align="center"> <table summary=""> <tr> <td bgcolor="#DDDDFF" class="border" align="left"> <pre> root@hamster$ <strong>nmap -sA -p 1-65535 www.jfranken.de</strong> Starting nmap V. 2.54BETA22 ( www.insecure.org/nmap/ ) Interesting ports on www.jfranken.de (195.88.176.20): (The 21 ports scanned but not shown below are in state: filtered) Port State Service 25/tcp UNfiltered smtp 80/tcp UNfiltered http 443/tcp UNfiltered https Nmap run completed -- 1 IP address (1 host up) scanned in 5138 seconds </pre></td> </tr> </table> </div> <br /> <p>Sobald auch nur ein Port <kbd>unfiltered</kbd> ist (hier z.B. 80), kann ich auf meinem Server für diesen Port einen <kbd>sshd</kbd> starten:</p> <p align="center"><img src="ssh/andererport1.png" width="640" alt="" height="147" /></p> oder den Port auf dem Server mit <kbd>ssh</kbd>, <kbd>inetd</kbd>/<kbd>nc</kbd>, <kbd>xinetd</kbd> oder Firewallregeln auf Port 22 umleiten: <p align="center"><img src="ssh/andererport2.png" width="640" alt="" height="147" /></p> <p>Beispiel: siehe <a href="ssh2.de.html" target="_parent">Teil 2</a>.</p> Dem Client gibt man entweder bei jedem Aufruf den Parameter <kbd>-p 80</kbd> oder trägt den Port dauerhaft in die <kbd>~/.ssh/config</kbd> ein:<br /> <div align="center"> <table summary=""> <tr> <td bgcolor="#DDDDFF" class="border" align="left"> <pre> Host www.jfranken.de Port 80 User jfranken </pre></td> </tr> </table> </div> <br /> <div class="pagebreak"> </div>  <h1><a name="ToC3">Vorhandene Proxyserver benutzen</a></h1> Wenn der eigene Rechner (laut <kbd>nmap</kbd>) keinen einzigen Port im Internet erreichen, aber auf einen Proxyserver zugreifen kann, liegt doch nichts näher, als die ssh-Verbindungen über diesen Proxyserver ins Internet zu leiten. <h2><a name="ToC4">ssh over http</a></h2> <h3><a name="ToC5">httptunnel</a></h3> <kbd>httptunnel</kbd> stellt einen tcp Port eines entfernten Servers lokal zur Verfügung. Für die Verbindung sorgen zwei kleine Programme (<kbd>hts</kbd> und <kbd>htc</kbd>), die im Netz wie Browser und Webserver über http kommunizieren. <p align="center"><img src="ssh/httptunnel2.png" width="640" alt="" height="117" /></p> <p>Setup:</p> <ul> <li>auf dem Server (als root, weil port 80 < 1024):<br /> <div align="center"> <table summary=""> <tr> <td bgcolor="#DDDDFF" class="border" align="left"> <pre> $ hts --no-daemon --forward-port localhost:22 80 </pre></td> </tr> </table> </div> <br /></li> <li>auf dem Client:<br /> <div align="center"> <table summary=""> <tr> <td bgcolor="#DDDDFF" class="border" align="left"> <pre> $ htc --no-daemon --forward-port 8888 --proxy proxy:8080 --proxy-authorization jfranken:geheim hamster:80 & $ ssh -p 8888 -o NoHostAuthenticationForLocalhost=yes localhost </pre></td> </tr> </table> </div> <br /></li> </ul> <p>Problematisch ist zurzeit (httptunnel Version 3.3) , dass</p> <ul> <li>nur eine Verbindung gleichzeitig über den Tunnel möglich ist</li> <li>ein Bug dafür sorgt, dass bei Verwendung eines Proxyservers der <kbd>hts</kbd> das Ende der Verbindung nicht mitbekommt. Man muß ihn nach jeder Verbindung stoppen und starten.</li> </ul> <br /> <table summary=""> <tr> <td bgcolor="#FFFFAA" class="border"><strong>Mehr zum Thema:</strong><br /> siehe: <a href="http://www.nocrew.org/software/httptunnel.html" target="_blank">httptunnel homepage</a></td> </tr> </table> <div class="pagebreak"> </div>  <h2><a name="ToC6">ssh over https</a></h2> <p align="center"><img src="ssh/ssh-https-tunnel.png" width="640" alt="" height="117" /></p> <h3><a name="ToC7">ssh-https-tunnel</a></h3> Das Perlscript <a href="http://www.snurgle.org/~griffon/ssh-https-tunnel" target="_blank">ssh-https-tunnel</a> weist einen Proxy-Server per CONNECT-Anweisung an, eine TCP-Verbindung zu einem remote Host zu öffnen und ermöglicht die Kommunikation dorthin über stdin/stdout. <p>Eine <a href="http://www.aschemann.net/download/ssh-https-tunnel/" target="_blank">Erweiterung</a> von Gerd Aschemann <kbd><gerd@aschemann.net></kbd> vereinfacht die Konfiguration dahingehend, dass man den Proxyserver nicht mehr im Sourcecode eintragen muß, sondern dass dieser aus der Environment-Variable <kbd>HTTP_PROXY</kbd> oder der Datei <kbd>~/.ssh/https-proxy.conf</kbd> ausgelesen wird:<br /></p> <div align="center"> <table summary=""> <tr> <td bgcolor="#DDDDFF" class="border" align="left"> <pre> $ <strong>HTTP_PROXY=http://proxy:8080 ./ssh-https-tunnel gate.jfranken.de 25</strong> 220 gate.jfranken.de ESMTP Exim 3.35 #1 Fri, 13 Sep 2002 18:08:13 +0200 <strong>HELO abc</strong> 250 gate.jfranken.de Hello proxy.jfranken.de [192.168.42.2] <strong>QUIT</strong> 221 gate.jfranken.de closing connection $ </pre></td> </tr> </table> </div> <br /> Das Proxy-Log zeigt nach dem Beenden der Verbindung:<br /> <div align="center"> <table summary=""> <tr> <td bgcolor="#DDDDFF" class="border" align="left"> <pre> proxy:~# <strong>tail -1 /var/log/squid/access.log| fmt</strong> 1031933305.366 11857 192.168.42.20 TCP_MISS/200 213 CONNECT gate.jfranken.de:25 - DIRECT/192.168.42.1 - </pre></td> </tr> </table> </div> <br /> <p>Durch so einen Tunnel kann man natürlich auch ssh fahren. Wenn der Proxyserver gut konfiguriert ist oder hinter einer Firewall steht, sind https-Verbindungen möglicherweise nur auf Port 443 möglich. In dem Fall reicht es, einen weiteren ssh-Dämon auf Port 443 zu starten, oder (z.B. per <kbd>ssh -gL 443:localhost:22 localhost</kbd> or xinetd) den Port auf den bereits auf Port 22 laufenden sshd zu forwarden.</p> <p>Setup:</p> <ul> <li>in <kbd>~/.ssh/config</kbd> folgende Zeilen anfügen:<br /> <div align="center"> <table summary=""> <tr> <td bgcolor="#DDDDFF" class="border" align="left"> <pre> host gate.jfranken.de ProxyCommand ~/.ssh/ssh-https-tunnel %h %p Port 443 </pre></td> </tr> </table> </div> <br /></li> <li>den Proxyserver in die Datei <kbd>~/.ssh/https-proxy.conf</kbd> eintragen:<br /> <div align="center"> <table summary=""> <tr> <td bgcolor="#DDDDFF" class="border" align="left"> <pre> host=proxy port=8080 </pre></td> </tr> </table> </div> <br /></li> </ul> <p>Und schon läuft die Verbindung über den Proxyserver an den ssh-Dämon, der auf <kbd>gate</kbd> auf Port 443 lauscht:<br /></p> <div align="center"> <table summary=""> <tr> <td bgcolor="#DDDDFF" class="border" align="left"> <pre> $ <strong>ssh -v gate.jfranken.de</strong> OpenSSH_3.4p1 Debian 1:3.4p1-2, SSH protocols 1.5/2.0, OpenSSL 0x0090605f debug1: Reading configuration data /export/home/jfranken/.ssh/config debug1: Applying options for gate.jfranken.de debug1: Applying options for * [...] debug1: Executing proxy command: ~/.ssh/ssh-https-tunnel gate.jfranken.de 443 [...] debug1: Remote protocol version 1.99, remote software version OpenSSH_2.9.9p2 [...] Last login: Fri Sep 13 18:28:31 2002 from p5080d740.dip.t-dialin.net Have a lot of fun... jfranken@gate:~$ </pre></td> </tr> </table> </div> <br /> <h3><a name="ToC8">transconnect</a></h3> <kbd>transconnect</kbd> ist eine C-Bibliothek, welche die connect-Funktion der glibc ersetzt, so dass der Verbindungsaufbau per https über einen Proxyserver läuft. Das funktioniert damit nur für dynamisch gelinkte Binaries (das kann man mit <kbd>ldd</kbd> prüfen). Der Vorteil gegenüber einem vorher einzurichtenden Tunnel liegt darin, dass die Anwendung flexibel in der Auswahl des Ports ist.<br /> <div align="center"> <table summary=""> <tr> <td bgcolor="#DDDDFF" class="border" align="left"> <pre> $ <strong>LD_PRELOAD=~/.tconn/tconn.so netcat hamster daytime</strong> Sat Sep 14 11:25:49 2002 </pre></td> </tr> </table> </div> <br /> <p>siehe <a href="http://transconnect.sourceforge.net/" target="_blank">transconnect Project Home Page</a></p> <h3><a name="ToC9">proxytunnel</a></h3> <kbd>proxytunnel</kbd> ist ein C-Programm, das mit Hilfe einer https-Verbindung zu einem Proxyserver einen remote Port wahlweise als Pipe oder lokalen Port verfügbar macht. Letzteren kann man sogar entweder als Daemon oder (automatisch bei Bedarf) über inetd/tcpd bereitstellen. <p>Die Syntax ist einfach:<br /></p> <div align="center"> <table summary=""> <tr> <td bgcolor="#DDDDFF" class="border" align="left"> <pre> $ <strong>./proxytunnel-linux-i386 --help</strong> Proxytunnel 1.1.0 Jos Visser (Muppet) <josv@osp.nl>, Mark Janssen (Maniac) <maniac@maniac.nl> Purpose: Build generic tunnels trough HTTPS proxy's, supports HTTP authorization Usage: Proxytunnel [OPTIONS]... -h --help Print help and exit -V --version Print version and exit -c --config=FILE Read config options from file (FIXME) -i --inetd Run from inetd (default=off) -a INT --standalone=INT Run as standalone daemon on specified port -f --nobackground Don't for to background in standalone mode (FIXME) -u STRING --user=STRING Username to send to HTTPS proxy for auth -s STRING --pass=STRING Password to send to HTTPS proxy for auth -g STRING --proxyhost=STRING HTTPS Proxy host to connect to -G INT --proxyport=INT HTTPS Proxy portnumber to connect to -d STRING --desthost=STRING Destination host to built the tunnel to -D INT --destport=INT Destination portnumber to built the tunnel to -n --dottedquad Convert destination hostname to dotted quad -v --verbose Turn on verbosity (default=off) -q --quiet Suppress messages (default=off) Examples: Proxytunnel [ -h | -V ] Proxytunnel -i [ -u user -s pass ] -g host -G port -d host -D port [ -n ] [ -v | -q ] Proxytunnel -a port [ -u user -s pass ] -g host -G port -d host -D port [ -n ] [ -v | -q ] </pre></td> </tr> </table> </div> <br /> <p>Beispiele zur Verwendung</p> <ul> <li>als pipe:<br /> <div align="center"> <table summary=""> <tr> <td bgcolor="#DDDDFF" class="border" align="left"> <pre> $ <strong>ssh -o ProxyCommand=./proxytunnel-linux-i386 -g proxy -G 8080 -d %h -D %p' gate</strong> Connected to proxy:8080 Starting tunnel Linux gate 2.2.19 #5 Wed May 1 20:15:01 CEST 2002 i586 unknown You have mail. Last login: Sat Sep 14 10:38:58 2002 from tp.jfranken.de jfranken@gate:~/ $ </pre></td> </tr> </table> </div> <br /></li> <li>als portforwarder:<br /> <div align="center"> <table summary=""> <tr> <td bgcolor="#DDDDFF" class="border" align="left"> <pre> $ <strong>./proxytunnel-linux-i386 -a 8888 -g proxy -G 8080 -d hamster -D 22</strong> Forked into the background with pid 1524 $ <strong>ssh -p 8888 -o NoHostAuthenticationForLocalhost=yes localhost</strong> Last login: Sat Sep 14 10:54:42 2002 from gate.jfranken.de jfranken@hamster:~/ $ </pre></td> </tr> </table> </div> <br /></li> </ul> Das kann man natürlich auch dauerhaft in <kbd>~/.ssh/config</kbd> konfigurieren:<br /> <div align="center"> <table summary=""> <tr> <td bgcolor="#DDDDFF" class="border" align="left"> <pre> Host gate-via-proxy Hostname gate.jfranken.de ProxyCommand "proxytunnel-linux-i386 -g proxy -G 3128 -d %h -D %p" </pre></td> </tr> </table> </div> <br /> <br /> <table summary=""> <tr> <td bgcolor="#FFFFAA" class="border"><strong>Mehr zum Thema:</strong><br /> siehe: siehe <a href="http://proxytunnel.sourceforge.net/" target="_blank">proxytunnel project homepage</a></td> </tr> </table> <h1><a name="ToC10">Empfehlungen</a></h1> Der beste Schutz vor ungewollten ssh-Verbindungen ins Internet besteht darin, den Internetzugriff im LAN zu verbieten und beispielsweise den Browser aus einer DMZ über X11, Citrix Metaframe, VNC o.ä. auf dem Client darzustellen. <h1><a name="ToC11">Weiterführendes</a></h1> <ul> <li><a href="http://www.employees.org/~satch/ssh/faq/ssh-faq.html" target="_blank">The Secure Shell TM Frequently Asked Questions</a></li> <li><a href="http://www.openssh.org/de/index.html" target="_blank">OpenSSH Projekt Seite</a></li> </ul> <div class="noprint"> <hr /> <table width="100%" summary=""> <tr> <td align="left" valign="middle"><font size="-2">$Id: ssh3.wml,v 1.32 2006/01/08 18:52:11 jfranken Exp $ <a href= "ssh3.log.html">[ChangeLog]</a><br /> $Id: template.inc,v 1.82 2010-09-04 12:58:17 jfranken Exp $ <a href="../../../template.log.html">[ChangeLog]</a><br /> © Johannes Franken. <a href="../../../impressum/rechtliches.de.html" target="_parent">Impressum und Haftungsausschluß</a></font></td> <td align="right" valign="middle"><a href="http://validator.w3.org/check/referer" target="w3c"><img border="0" src= "../../../images/valid-xhtml10.png" alt="Valid XHTML 1.0!" width="88" height="31" /></a></td> </tr> </table> </div> <hr /> <h1>Navigation:</h1> <font size="1"><script type="text/javascript" language="JavaScript"> //<![CDATA[  //]]> </script> <script type="text/javascript" language="JavaScript"> //<![CDATA[  //]]> </script> <a href="../../../startseite.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_startseite', 0, ''); 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return true" onmouseout="nb_imgNormal('nb_img1_lsof'); return true" onfocus= "nb_imgOver('nb_img1_lsof', 0, ''); return true" onblur="nb_imgNormal('nb_img1_lsof'); return true"><img name= "nb_img1_lsof" src="../../../images/lsof-std.de.png" border="0" alt="lsof" width="29" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/vortraege/linux1.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_linux1', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_linux1'); return true" onfocus= "nb_imgOver('nb_img1_linux1', 0, ''); return true" onblur="nb_imgNormal('nb_img1_linux1'); return true"><img name= "nb_img1_linux1" src="../../../images/linux1-std.de.png" border="0" alt="Linux 1" width="61" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/vortraege/linux2.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_linux2', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_linux2'); return true" onfocus= "nb_imgOver('nb_img1_linux2', 0, ''); return true" onblur="nb_imgNormal('nb_img1_linux2'); return true"><img name= "nb_img1_linux2" src="../../../images/linux2-std.de.png" border="0" alt="Linux 2" width="62" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/vortraege/linux3.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_linux3', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_linux3'); return true" onfocus= "nb_imgOver('nb_img1_linux3', 0, ''); return true" onblur="nb_imgNormal('nb_img1_linux3'); return true"><img name= "nb_img1_linux3" src="../../../images/linux3-std.de.png" border="0" alt="Linux 3" width="62" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/vortraege/vi.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_vi', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_vi'); return true" onfocus= "nb_imgOver('nb_img1_vi', 0, ''); return true" onblur="nb_imgNormal('nb_img1_vi'); return true"><img name="nb_img1_vi" src="../../../images/vi-std.de.png" border="0" alt="vi" width="15" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/vortraege/lamp.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_lamp', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_lamp'); return true" onfocus= "nb_imgOver('nb_img1_lamp', 0, ''); return true" onblur="nb_imgNormal('nb_img1_lamp'); return true"><img name= "nb_img1_lamp" src="../../../images/lamp-std.de.png" border="0" alt="LAMP" width="58" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/vortraege/make.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_make', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_make'); return true" onfocus= "nb_imgOver('nb_img1_make', 0, ''); return true" onblur="nb_imgNormal('nb_img1_make'); return true"><img name= "nb_img1_make" src="../../../images/make-std.de.png" border="0" alt="make" width="48" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/vortraege/mirroring.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_mirroring', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_mirroring'); return true" onfocus="nb_imgOver('nb_img1_mirroring', 0, ''); return true" onblur= "nb_imgNormal('nb_img1_mirroring'); return true"><img name="nb_img1_mirroring" src= "../../../images/mirroring-std.de.png" border="0" alt="Mirroring" width="78" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/vortraege/netcat.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_netcat', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_netcat'); return true" onfocus= "nb_imgOver('nb_img1_netcat', 0, ''); return true" onblur="nb_imgNormal('nb_img1_netcat'); return true"><img name= "nb_img1_netcat" src="../../../images/netcat-std.de.png" border="0" alt="netcat" width="55" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/vortraege/ntpd.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_ntpd', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_ntpd'); return true" onfocus= "nb_imgOver('nb_img1_ntpd', 0, ''); return true" onblur="nb_imgNormal('nb_img1_ntpd'); return true"><img name= "nb_img1_ntpd" src="../../../images/ntpd-std.de.png" border="0" alt="Zeitabgleich" width="99" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/vortraege/rcs.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_rcs', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_rcs'); return true" onfocus= "nb_imgOver('nb_img1_rcs', 0, ''); return true" onblur="nb_imgNormal('nb_img1_rcs'); return true"><img name= "nb_img1_rcs" src="../../../images/rcs-std.de.png" border="0" alt="rcs" width="25" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/vortraege/squid.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_squid', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_squid'); return true" onfocus= "nb_imgOver('nb_img1_squid', 0, ''); return true" onblur="nb_imgNormal('nb_img1_squid'); return true"><img name= "nb_img1_squid" src="../../../images/squid-std.de.png" border="0" alt="squid" width="42" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/vortraege/solaris.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_solaris', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_solaris'); return true" onfocus= "nb_imgOver('nb_img1_solaris', 0, ''); return true" onblur="nb_imgNormal('nb_img1_solaris'); return true"><img name= "nb_img1_solaris" src="../../../images/solaris-std.de.png" border="0" alt="Solaris" width="52" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/vortraege/ssh1.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_ssh1', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_ssh1'); return true" onfocus= "nb_imgOver('nb_img1_ssh1', 0, ''); return true" onblur="nb_imgNormal('nb_img1_ssh1'); return true"><img name= "nb_img1_ssh1" src="../../../images/ssh1-std.de.png" border="0" alt="ssh 1" width="41" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/vortraege/ssh2.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_ssh2', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_ssh2'); return true" onfocus= "nb_imgOver('nb_img1_ssh2', 0, ''); return true" onblur="nb_imgNormal('nb_img1_ssh2'); return true"><img name= "nb_img1_ssh2" src="../../../images/ssh2-std.de.png" border="0" alt="ssh 2" width="42" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><img src="../../../images/ssh3-sel.de.png" alt="ssh 3*" width="42" height="26" /><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/vortraege/tcpip1.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_tcpip1', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_tcpip1'); return true" onfocus= "nb_imgOver('nb_img1_tcpip1', 0, ''); return true" onblur="nb_imgNormal('nb_img1_tcpip1'); return true"><img name= "nb_img1_tcpip1" src="../../../images/tcpip1-std.de.png" border="0" alt="tcp/ip 1" width="67" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="   " width="30" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/vortraege/tcpip2.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_tcpip2', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_tcpip2'); return true" onfocus= "nb_imgOver('nb_img1_tcpip2', 0, ''); return true" onblur="nb_imgNormal('nb_img1_tcpip2'); return true"><img name= "nb_img1_tcpip2" src="../../../images/tcpip2-std.de.png" border="0" alt="tcp/ip 2" width="68" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="  " width="20" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/books.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_books', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_books'); return true" onfocus= "nb_imgOver('nb_img1_books', 0, ''); return true" onblur="nb_imgNormal('nb_img1_books'); return true"><img name= "nb_img1_books" src="../../../images/books-std.de.png" border="0" alt="Buecher" width="70" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="  " width="20" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/j_fotos.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_j_fotos', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_j_fotos'); return true" onfocus= "nb_imgOver('nb_img1_j_fotos', 0, ''); return true" onblur="nb_imgNormal('nb_img1_j_fotos'); return true"><img name= "nb_img1_j_fotos" src="../../../images/j_fotos-std.de.png" border="0" alt="Fotos" width="49" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="  " width="20" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/leisure.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_leisure', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_leisure'); return true" onfocus= "nb_imgOver('nb_img1_leisure', 0, ''); return true" onblur="nb_imgNormal('nb_img1_leisure'); return true"><img name= "nb_img1_leisure" src="../../../images/leisure-std.de.png" border="0" alt="Freizeit" width="61" height= "26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="  " width="20" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/j_humor.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_j_humor', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_j_humor'); return true" onfocus= "nb_imgOver('nb_img1_j_humor', 0, ''); return true" onblur="nb_imgNormal('nb_img1_j_humor'); return true"><img name= "nb_img1_j_humor" src="../../../images/j_humor-std.de.png" border="0" alt="Humor" width="60" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="  " width="20" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/kenntnisse.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_kenntnisse', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_kenntnisse'); return true" onfocus="nb_imgOver('nb_img1_kenntnisse', 0, ''); return true" onblur= "nb_imgNormal('nb_img1_kenntnisse'); return true"><img name="nb_img1_kenntnisse" src= "../../../images/kenntnisse-std.de.png" border="0" alt="Kenntnisse" width="89" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="  " width="20" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/j_lebenslauf.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_j_lebenslauf', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_j_lebenslauf'); return true" onfocus="nb_imgOver('nb_img1_j_lebenslauf', 0, ''); return true" onblur= "nb_imgNormal('nb_img1_j_lebenslauf'); return true"><img name="nb_img1_j_lebenslauf" src= "../../../images/j_lebenslauf-std.de.png" border="0" alt="Lebenslauf" width="87" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="  " width="20" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/j_wunschliste.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_j_wunschliste', 0, ''); return true" onmouseout= "nb_imgNormal('nb_img1_j_wunschliste'); return true" onfocus="nb_imgOver('nb_img1_j_wunschliste', 0, ''); return true" onblur="nb_imgNormal('nb_img1_j_wunschliste'); return true"><img name="nb_img1_j_wunschliste" src= "../../../images/j_wunschliste-std.de.png" border="0" alt="Wunschliste" width="99" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt="  " width="20" height="1" align="bottom" border= "0" /><a href="../../../homepages/johannes/j_pgp.de.html" target="_top" onmouseover= "nb_imgOver('nb_img1_j_pgp', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_j_pgp'); return true" onfocus= "nb_imgOver('nb_img1_j_pgp', 0, ''); return true" onblur="nb_imgNormal('nb_img1_j_pgp'); return true"><img name= "nb_img1_j_pgp" src="../../../images/j_pgp-std.de.png" border="0" alt="PGP" width="42" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt=" " width="10" height="1" align="bottom" border="0" /><a href= "../../../homepages/beate.de.html" target="_top" onmouseover="nb_imgOver('nb_img1_beate', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_beate'); return true" onfocus="nb_imgOver('nb_img1_beate', 0, ''); return true" onblur="nb_imgNormal('nb_img1_beate'); return true"><img name="nb_img1_beate" src="../../../images/beate-std.de.png" border="0" alt="Beate" width="51" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt=" " width="10" height="1" align="bottom" border="0" /><a href= "../../../homepages/sarah.de.html" target="_top" onmouseover="nb_imgOver('nb_img1_sarah', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_sarah'); return true" onfocus="nb_imgOver('nb_img1_sarah', 0, ''); return true" onblur="nb_imgNormal('nb_img1_sarah'); return true"><img name="nb_img1_sarah" src="../../../images/sarah-std.de.png" border="0" alt="Sarah" width="48" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt=" " width="10" height="1" align="bottom" border="0" /><a href= "../../../homepages/hannah.de.html" target="_top" onmouseover="nb_imgOver('nb_img1_hannah', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_hannah'); return true" onfocus="nb_imgOver('nb_img1_hannah', 0, ''); return true" onblur="nb_imgNormal('nb_img1_hannah'); return true"><img name="nb_img1_hannah" src="../../../images/hannah-std.de.png" border="0" alt="Hannah" width="64" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt=" " width="10" height="1" align="bottom" border="0" /><a href= "../../../homepages/lena.de.html" target="_top" onmouseover="nb_imgOver('nb_img1_lena', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_lena'); return true" onfocus="nb_imgOver('nb_img1_lena', 0, ''); return true" onblur= "nb_imgNormal('nb_img1_lena'); return true"><img name="nb_img1_lena" src="../../../images/lena-std.de.png" border="0" alt="Lena" width="41" height="26" /></a><br /> <img src="../../../images/transparentpixel.png" alt=" " width="10" height="1" align="bottom" border="0" /><a href= "../../../homepages/kids.de.html" target="_top" onmouseover="nb_imgOver('nb_img1_kids', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_kids'); return true" onfocus="nb_imgOver('nb_img1_kids', 0, ''); return true" onblur= "nb_imgNormal('nb_img1_kids'); return true"><img name="nb_img1_kids" src="../../../images/kids-std.de.png" border="0" alt="Geschwister" width="100" height="26" /></a><br /> <a href="../../../gaestebuch.de.html" target="_top" onmouseover="nb_imgOver('nb_img1_gaestebuch', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_gaestebuch'); return true" onfocus= "nb_imgOver('nb_img1_gaestebuch', 0, ''); return true" onblur= "nb_imgNormal('nb_img1_gaestebuch'); return true"><img name="nb_img1_gaestebuch" src= "../../../images/gaestebuch-std.de.png" border="0" alt="Gaestebuch" width="97" height="26" /></a><br /> <a href="../../../impressum.de.html" target="_top" onmouseover="nb_imgOver('nb_img1_impressum', 0, ''); return true" onmouseout="nb_imgNormal('nb_img1_impressum'); return true" onfocus= "nb_imgOver('nb_img1_impressum', 0, ''); return true" onblur= "nb_imgNormal('nb_img1_impressum'); return true"><img name="nb_img1_impressum" src= "../../../images/impressum-std.de.png" border="0" alt="Impressum" width="90" height="26" /></a></font><br /> <br /> <br /> <form method="get" action="http://www.google.com/custom" target="jfrankeninhalt"><img src= "../../../images/transparentpixel.png" alt=" " width="190" height="2" align="bottom" border="0" /><br /> <img src="../../../images/transparentpixel.png" alt=" " width="8" height="1" align="bottom" border="0" /><img src= "../../../images/google16x16.png" alt="" width="16" height="19" /><img src="../../../images/transparentpixel.png" alt= " " width="8" height="1" align="bottom" border="0" /><input type="image" name="sa" value="Suchen" src= "../../../images/Suche.de.png" alt="Suche:" /><br /> <img src="../../../images/transparentpixel.png" alt=" " width="32" height="1" align="bottom" border="0" /><input type= "text" name="q" size="10" maxlength="255" value="" style= "color:#ddddff;border-color:#ddddff;background:#112277" /><input type="hidden" name="cof" value= "T:000000;LW:540;ALC:112277;L:http://www.jfranken.de/images/toptext_FRANKEN--EDV-KONZEPTE.png;LC:112277;LH:53;BGC:ffffff;AH:left;VLC:112277;AWFID:ec81011eb1f53f99;" /><input type="hidden" name="domains" value="www.jfranken.de" /><br /> <input type="hidden" name="sitesearch" value="www.jfranken.de" /></form> <script type="text/javascript" language="JavaScript"> //<![CDATA[ function ro_imgNormal(imgName) { if (document.images) { document[imgName].src = eval(imgName + '_n.src'); self.status = ''; } } function ro_imgOver(imgName, descript) { if (document.images) { document[imgName].src = eval(imgName + '_o.src'); self.status = descript; } } //]]> </script><br /> <img src="../../../images/transparentpixel.png" alt=" " width="190" height="2" align="bottom" border="0" /><br /> <img src="../../../images/transparentpixel.png" alt=" " width="8" height="1" align="bottom" border="0" /><img src= "../../../images/feed-icon-16x16.png" alt="" width="16" height="19" /><img src="../../../images/transparentpixel.png" alt=" " width="8" height="1" align="bottom" border="0" /><img src="../../../images/NewsFeeds.png" alt="NewsFeeds" width="67" height="19" /><br /> <img src="../../../images/transparentpixel.png" alt=" " width="32" height="1" align="bottom" border="0" /> <script type="text/javascript" language="JavaScript"> //<![CDATA[  //]]> </script><a href="http://www.jfranken.de/feed-rss2.de.xml" target="_blank" onmouseover= "ro_imgOver('ro_img_unknown4', 'RSS2-Feed'); return true" onmouseout="ro_imgNormal('ro_img_unknown4'); return true" onfocus="ro_imgOver('ro_img_unknown4', 'RSS2-Feed'); return true" onblur= "ro_imgNormal('ro_img_unknown4'); return true"><img name="ro_img_unknown4" src="../../../images/feed-rss2.png" alt= "RSS2-Feed" width="70" height="15" border="0" /></a><br /> <img src="../../../images/transparentpixel.png" alt=" " width="32" height="1" align="bottom" border="0" /> <script type="text/javascript" language="JavaScript"> //<![CDATA[  //]]> </script><a href="http://www.jfranken.de/feed-atom1.de.xml" target="_blank" onmouseover= "ro_imgOver('ro_img_unknown5', 'ATOM1-Feed'); return true" onmouseout="ro_imgNormal('ro_img_unknown5'); return true" onfocus="ro_imgOver('ro_img_unknown5', 'ATOM1-Feed'); return true" onblur= "ro_imgNormal('ro_img_unknown5'); return true"><img name="ro_img_unknown5" src="../../../images/feed-atom1.png" alt= "ATOM1-Feed" width="70" height="15" border="0" /></a><br /> <img src="../../../images/transparentpixel.png" alt=" " width="32" height="1" align="bottom" border="0" /> <script type="text/javascript" language="JavaScript"> //<![CDATA[  //]]> </script><a href="../../../impressum/feeds.de.html" target="_parent" onmouseover= "ro_imgOver('ro_img_unknown6', 'Abonnieren'); return true" onmouseout="ro_imgNormal('ro_img_unknown6'); return true" onfocus="ro_imgOver('ro_img_unknown6', 'Abonnieren'); return true" onblur= "ro_imgNormal('ro_img_unknown6'); return true"><img name="ro_img_unknown6" src="../../../images/Subscribe.de.png" alt= "Abonnieren" width="75" height="19" border="0" /></a> </body>