[CentOS] output of "ls" (was: Re: Postgrey on CentOS 6)

[Richard Mann]

> -----Original Message-----
> From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On
> Behalf Of Gabriele Pohl
> Sent: Friday, April 22, 2016 11:53 AM
> To: centos at centos.org
> Subject: [CentOS] output of "ls" (was: Re: Postgrey on CentOS 6)
> 
> On Sat, 23 Apr 2016 02:23:28 +1200
> Peter <peter at pajamian.dhs.org> wrote:
> 
> > On 23/04/16 02:13, Gabriele Pohl wrote:
> > > I administer a postfix mail server on CentOS 6.
> > > Now I want to setup another with similar configuration.
> > >
> > > But the postgrey package is no longer available in Epel
> > > for this CentOS release as I have seen now:
> > > https://admin.fedoraproject.org/pkgdb/package/rpms/postgrey/
> > >
> > > 2. Can you give advice for an alternative setup
> > >    of greylisting for postfix on CentOS 6?
> >
> > Postgrey is largely obsoleted by postscreen which comes with postfix
> > versions 2.8 and up.  You can get the latest postfix (including
> > postscreen) for CentOS 6 from GhettoForge (www.ghettoforge.org).
> 
> Thanks for your help and so quickly :)
> 
> I decided to try with current version of postgrey
> from projects github repository.
> https://github.com/schweikert/postgrey/releases/tag/version-1.36
> as I want to avoid using more 3rd party repos.
> 
> Doing the first steps in manual installation
> (create directory and user) I found out,
> that I lack from knowledge on "ls" output..
> 
> There is a difference that I don't understand.
> 
> What does the "." at the right side
> of the attributes list mean?
> 

Following the file mode bits is a single character that specifies
     whether an alternate access method such as an access control list
     applies to the file.  When the character following the file mode
     bits is a space, there is no alternate access method.  When it is
     a printing character, then there is such a method.

     GNU `ls' uses a `.' character to indicate a file with an SELinux
     security context, but no other alternate access method.

     A file with any other combination of alternate access methods is
     marked with a `+' character.


> directory manually created on the shell:
> drwxr-x--x 2 postgrey postfix 4096 Apr 22 17:19 /var/spool/postfix/postgrey/
> 
> created by package installation:
> drwxr-x--x. 2 postgrey postfix 4096 Apr 13 16:23 /var/spool/postfix/postgrey
> 
> I used this commands to create the first one
> 
> # mkdir /var/spool/postfix/postgrey
> # chmod 751 /var/spool/postfix/postgrey
> # groupadd --gid 493 postgrey
> # useradd --system --gid 493 --uid 493 --home /var/spool/postfix/postgrey -
> M --shell /sbin/nologin postgrey
> # chown postgrey /var/spool/postfix/postgrey
> # chgrp postfix /var/spool/postfix/postgrey
> 
> Can you give explanation what is causing the difference
> compared to the package created directory?
> 
> Gabriele