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Old 03-19-2013, 02:25 PM   #1
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RPC: Authentication error; why = Client credential too weak

OS: RHEL 6.2 , 2.6.32-220.el6.i686

I created a service using RPC and is compiled using rpcgen and gcc.

When I try to run the service I get the following Error :

Cannot register service: RPC: Authentication error; why = Client credential too weak

I restarted rpcbind with argument -i. Now able to register the RPC process.

man page shows that -i meaning insecure mode. Do I need to rewrite the program to have secure registration? If so any example please.

what causes insecure mode?

Last edited by harig; 03-20-2013 at 02:20 AM.
Old 03-20-2013, 08:09 AM   #2
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RPC has various security options ranging from None (Unix) through DES to possibly stronger recent versions I've not investigated. I'm afraid I last did RPC programming before the US allowed the relevant libraries to be exported so I didn't use those security features but added my own.
Old 03-20-2013, 10:32 AM   #3
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... and you definitely want to run your RPC service with some level of cryptographic security and client-authentication. Even if you do not actually care if the data being passed is unintelligible (e.g. it's internal-only or passing through a VPN tunnel already), you do want other things like message-integrity and provenance. Take the time to really study these features closely.

An overly-trusting RPC service is a "Bobby Tables problem" at worst, but a source of unacceptable lack-of troubleshooting at best.

Last edited by sundialsvcs; 03-20-2013 at 10:33 AM.


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