At 18:25 20/04/98 -0400, Marcus J. Ranum wrote: >Joseph S. D. Yao wrote: >>> I also intend to do some "out-of-band" mgmt with a dialin >>> modem on the serial console of the two sun boxes (yes, yes, >>> wardialers I know). However, this is what the customer wants, >>> and I have no say-so, so I need to simply get it set up. ...<SNIP>... >I've been pondering the secure remote management thing for a while >and was trying to come up with decent solutions that are dirt cheap. >Haven't tried this, but does anyone see a flaw with: > - have a log-in that drops you right into PPP using CHAP > - run ip_filt on the workstation to filter access via the PPP interface > - let only SSH in over PPP (or whatever other services are OK) I would personnaly prefer a plain ASCII login via a dedicated login program with `strong' authentication with S/key or any other OTP. Then a complete logging of everything the user types. We can even restrict the login program to start a restricted shell. (of course, your firewall should have a ASCII interface...). One issue is of course that you must trust the physical phone line. Confidentiality is probably not a big issue for firewall management (as long as you do not manage passwords!), hijacking is a problematic issue of course. NB: the latter paragraph also apply to your PPP/CHAP solution. NB2: instead of using CHAP with static password, I would prefer PAP (clear text passwords) with OTP. > >mjr. >-- >Marcus J. Ranum, CEO, Network Flight Recorder, Inc. >work - http://www.nfr.net >home - http://www.clark.net/pub/mjr > Eric Vyncke Technical Consultant Cisco Systems Belgium SA/NV Phone: +32-2-778.4677 Fax: +32-2-778.4300 E-mail: evynckeat_private Mobile: +32-75-312.458
This archive was generated by hypermail 2b30 : Fri Apr 13 2001 - 12:56:06 PDT