No subject

Hailun Tan dearambermini at
Tue Jun 26 04:57:14 CEST 2018

On Tue, Jun 26, 2018 at 11:24 AM, Alan DeKok <aland at>

> On Jun 25, 2018, at 9:09 PM, Hailun Tan <dearambermini at> wrote:
> > I do not think the answer in the previous link was clear.
>   It doesn't explain *why* PAM works the way it does.  But it explains
> what's happening, and how to fix it.
>   PAM problems?  Ask the PAM people
> > The only viable solution in the link above is that having another local
> > user  with the same name then it will fix the problem. Yes, it does fix
> the
> > problem. But what is the point to have radius server if  a local user is
> > required  for radius to work?
>   The point is that you can specify a users password (or OTP) via RADIUS.
>   If you read the PAM documentation, it says that PAM doesn't supply UID,
> GID, shell, home directory, etc.  PAM only does username / password
> checking.  And some session logging.
> >  Considering that there are thousands of
> > radius clients to hookup with one radius server, having a local user for
> > each of these clients for such user to work does not make sense.
>   That's what LDAP is for.  Put the users into LDAP.  Configure NSS &&
> LDAP.  That gets you UID, GID, etc.  Then do username / password checking
> via RADIUS.

I am new in the Radius  concept. So  the users in Radius server cannot be
processed as those in LDAP because the users in Radius are not configured
with UID/GID, etc? On the other hand, Radius cannot completely take the
role of LDAP?

So i wonder if PAM is not used for username/ password checking, in that
case,  Does the UID/GID missing in Radius user matter? In that way, can
Radius server replace LDAP?

Thanks again for your advice.

> > My question is very clear. If is not the one to be
> > fixed, which other pam module should be fixed?
>   As I said repeatedly, ask the PAM people how their software works.  This
> isn't the "PAM help list".  This is the FreeRADIUS list.
> > At least you can provide a
> > way for us to check which PAM module is failing so that we can check.
>   No.  It's ridiculous to ask that, because I didn't write PAM, and I know
> nothing about it.
> > I
> > have even tried to disable ALL the pam module in /etc/pam.d/sshd except
> > but I cannot even log in the ubuntu if i did that :(
> So
> > that is the most difficult part to troubleshoot with PAM.
>   That's terrible.
>   Why does that happen?  I don't know...
>   Alan DeKok.
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