Re: [Exim] authentication with PAM

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Autor: Tamas TEVESZ
Data:  
Para: Gabor Gludovatz
CC: exim-users
Asunto: Re: [Exim] authentication with PAM
On Fri, 4 May 2001, Gabor Gludovatz wrote:

> server_condition = "${if pam{$1:$2}{1}{0}}"


> I think the problem is that, that exim tries to authenticate as user mail


yes

> (uid 8) and it is unable to. Is there a nice solution to this problem?


no. not with current linux pam. a workaround is to generate a simple
"username:passwordhash" out of /etc/{passwd,shadow} periodically and
use a file lookup on that. ugly, but currently either this, or
separate your mail users entirely from the system users. there's
rumoured to be a hack around this pam `limitation' (i couldn't yet
decide whether this is a limitation, an implementation problem, or
what), but i never bothered to find it; separation was a better
solution for my needs.

ps. philip, i think i've tried using pam lookup with a 0640
root:shadow /etc/shadow file and starting exim as `sg shadow -c "exim
..."', and also putting the user `mail' (which exim runs as) into the
`shadow' group, but iirc, it failed. the latter one for sure, the
previous one maybe (hm, its getting late..). i think exim either does
not initialize the supplementary groups correctly if at all. is this
really the case, or, as usual, was it my PEBKAC ?


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