[exim] Authentication returns code 435 instead of 535

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Autor: Yves Goergen
Data:  
A: exim-users
Assumpte: [exim] Authentication returns code 435 instead of 535
Hello,

I've set up Exim to use PAM authantication. That should return the
correct PAM return values:

PAM_SUCCESS - all good
PAM_AUTH_ERR - wrong password
PAM_USER_UNKNOWN - wrong user

I see a lot of lines like this in the mainlog:

> 2020-12-27 20:04:00 login authenticator failed for (USER) [199.192.16.253]: 435 Unable to authenticate at present (set_id=scanner@???): Permission denied


So it returns the temporary code 435 instead of the permanent code 535.
Why's that? I'm using the suggested config from the Exim manual. Should
there be a "fail" or "false" somewhere in the expansion?

> begin authenticators
>
> fixed_plain:
>     driver = plaintext
>     public_name = PLAIN
>     server_prompts = :
>     # Check password in $auth3 for user in $auth2
>     server_condition = ${if pam{$auth2:${sg{$auth3}{:}{::}}}}
>     server_set_id = $auth2

>
> login:
>     driver = plaintext
>     public_name = LOGIN
>     server_prompts = Username:: : Password::
>     # Check password in $auth2 for user in $auth1
>     server_condition = ${if pam{$auth1:${sg{$auth2}{:}{::}}}}
>     server_set_id = $auth1


-Yves