Escape that network!

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Wie man SSH-Tunnel einrichtet, wissen wir ja bereits. Es ist kein Problem, irgend einen Serverdienst vom Netzwerk zuhause verschlüsselt in die Firma zu holen und so tun, als würde er im Geschäft laufen.

Solange ich von der Firma aus freien Zugriff auf das Internet habe, klappt das.

Was aber, wenn das Internet über einen Proxyserver läuft, der womöglich noch will, dass man sich anmeldet, damit die Firma schauen kann, wer wann wo wieviel surft? Oder gewisse Seiten ganz sperrt?

Ich kann keine SSH-Verbindung aus so einem Netzwerk machen.
Sehr wohl aber eine HTTP-Verbindung.

Ich muss also die SSH-Pakete in HTTP-Pakete verpacken und kann sie so am Proxy und an der Firewall vorbeischleusen und über meinen Server zuhause surfen – vorbei an den neugierigen Augen irgendwelcher Manager und vorbei an den Sperrlisten.

httptunnel kümmert sich darum: hypertunnelNT

httptunnel verpackt die SSH Pakete in HTTP und verbindet sich mit der Gegenstelle, wo dann der SSH-Server läuft.

Wir starten den httptunnel-Server auf dem Server, wo der SSH-Server läuft:
hts --forward-port localhost:22 80

httptunnel läuft auf Port 80 (Standard Webserver Port) und stellt den Port des SSH-Servers (22) zur Verfügung.

Jetzt mit dem httptunnel-Client im Firmennetzwerk zum httptunnel-Server verbinden:
htc --forward-port 8888 --proxy proxy:8080 --proxy-authorization user:pass sshserver.homeip.net:80

Upps – mein SSH-Server sollte doch eigentlich zuhause laufen – plötzlich läuft er via HTTP auf meinem Rechner in der Firma!

Verbinden wir uns doch:
ssh -p 8888 -o NoHostAuthenticationForLocalhost=yes localhost

Adjö minand danggschön!

Wollen wir noch darüber surfen?
ssh -p 8888 -L 3128:localhost:3128 -o NoHostAuthenticationForLocalhost=yes localhost

WUHSAA!

Meine bösen, verschlüsselten SSH-Pakete werden in HTTP neu verpackt und es sieht so aus, als würde ich eine normale HTTP-Seite besuchen… *hihi*
Und die Manager am Proxyserver sehen bloss kryptographischen Abfall.

Dabei könnte ich über diese Verbindung auf meine Daten zuhause zugreifen, surfen, Musik hören – irgendwas.
Aber auch umgekehrt: Ich könnte einen Dienst, der im „geschützten“ Firmennetz läuft (z.B. LDAP…) plötzlich auf dem Rechner zuhause verfügbar machen.
Und von dort aus weiter im Internet…….. huiuiui

Gute Menschen kommen in den Himmel, Hacker kommen überall hin! 😛

(was nicht heisst, dass Hacker schlechte Menschen sind…)