Re: pam_user_unknown

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On Tue, 20.05.03, mla <wyl_lyf@xxxxxxxxx> wrote:

> users using it in login, etc. I noticed that even if I used an invalid
> user it returns authentication failed which should have been pam_user_unknown.
> did I miss something here? I dunno why its doing this.

I think this was done as a security precaution. authentication failed leads
to a delay that is different from pam_user_unknown. If you now analyse
response times for remote authentication attempts (say ssh) you can easily
differentiate between an existing and non-existing user, which in turn can
be used to brute-force usernames on the remote machine.

cya,

Nils
-- 
Nils Juergens  | ju@xxxxxxxxxxxxxxxxxx
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