[ale] access.conf syntax on CentOS 8

[Jim Kinney]

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On June 9, 2020 11:48:44 PM EDT, "Beddingfield, Allen via Ale" <ale at ale.org> wrote:
>I have never really put much thought into my LDAP client configuration.
>I finally, begrudgingly switched to using SSSD around CentOS 7/SLES 12.
>I've been just putting sssd.conf on the system, and on CentOS manually
>pushing some files in /etc/pam.d and an nsswitch file with config
>management software (on SLES I use the "pam-config" utility).
>My nsswitch config was using "compat" so that I tacked the netgroups
>onto the end of passwd as always.
>Well, I've noticed that with CentOS 8, I can just drop sssd.conf onto
>the server, restart sssd and do "authselect select sssd with-mkhomedir"
>and everything works - except for netgroups on the end of passwd.  They
>are ignored, and ALL LDAP users can log in.
>I know I can create a custom authselect profile to put compat in
>nsswitch, but I thought it would be a good opportunity to "do it the
>modern way", so I started looking into access.conf.
>I see how to do all the examples in the man page and the config file,
>but they don't match my exact need, and I'm not sure if the combination
>I need is possible.
>
>Here is what I want to do:
>Allow root to log in from anywhere
>Allow all LOCAL users to log in from anywhere
>Allow members of LDAP Netgroup "linuxadmin" to log in from anywhere.
>Deny all other LDAP members that the bind user can see.
>
>The examples I'm seeing are of explicitly listing root, local users by
>name, and the netgroup.  Is there some wildcard to use for "all local
>users"?  We have a lot of systems where the end users are logging in
>with local credentials, and we use LDAP for admin users - so there is
>no consistent list of local accounts.
>In the past, I've just put "+ at linuxadmin::::::" at the end of
>/etc/passwd and accomplished this.  
>Obviously if I don't either configure compat in nsswitch or
>access.conf, any user the LDAP bind account can see will be able to log
>in, and that is NOT what I want to happen.
>
>Any thoughts?
>Thanks.
>Allen B.
>--
>Allen Beddingfield
>Systems Engineer
>Office of Information Technology
>The University of Alabama
>Office 205-348-2251
>allen at ua.edu
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