[syslog-ng] Syslog-ng not honoring negative flag

Wed Apr 7 06:38:37 UTC 2021

Your ssh messages reads

filter ssh_messages { facility("AUTH") and level("INFO"); };

Are you sure all ssh related messages are logged at auth.info?

Note that unlike syslogd level(info) will only match "info" exactly and not
info and up. To match a range, you can use level (info..emerg)

Also, why don't you just match on program name? E.g. program("sshd") or
something?

And one last note, once you deliver a message using flags(final) you won't
need to negate the filter in subsequent log paths. Syslog-ng would simply
stop processing at flags (final).

On Wed, Apr 7, 2021, 08:06 Dan Egli <dan at newideatest.site> wrote:

> No joy. I tried swapping it different ways.
>
> filter -> source -> destination = combined
> source -> filter -> destination = combined
>
> Here's what my config looks like now, after the second variant:
>
> @version: 3.30
>
> @include "scl.conf"
>
> options {
>      threaded(yes);
>      chain_hostnames(no);
>      stats_freq(43200);
>      mark_freq(3600);
> };
>
> source src { system(); internal(); };
>
> filter samba { program("samba"); };
> filter ssh_messages { facility("AUTH") and level("INFO"); };
> filter syslog { not filter("ssh_messages") and not filter("samba"); };
>
> destination console { file("/dev/tty12"); };
> destination messages { file("/var/log/messages"); };
> destination sshd_log { file("/var/log/sshd/sshd.log"); };
> destination smb_logs { file("/var/log/samba/samba.log"); };
>
> log { source(src); filter(samba); destination(smb_logs); flags(final); );
> log { source(src); filter(ssh_messages); destination(sshd_log);
> flags(final); };
> log { source(src); filter(syslog); destination(console); };
> log { source(src); filter(syslog); destination(messages); };
>
>
> Still, sshd messages are appearing in /var/log/messages.
>
> On 4/6/2021 11:51 PM, Peter Kokai (pkokai) wrote:
> > Hello,
> >
> > The order in the configuration matters.
> > log { source(src); destination(console); filter(syslog); };
> > The message flow is the following in your example source(src) ->
> destination(console) -> filter(syslog) -> void
> > The filter recieves messages only after destination, if you switch
> filter and destination it should be fine.
> >
> > --
> > kokan
> >
> > ________________________________________
> > From: syslog-ng <syslog-ng-bounces at lists.balabit.hu> on behalf of Dan
> Egli <dan at newideatest.site>
> > Sent: 07 April 2021 07:17
> > To: syslog-ng at lists.balabit.hu
> > Subject: [syslog-ng] Syslog-ng not honoring negative flag
> >
> > CAUTION: This email originated from outside of the organization. Do not
> follow guidance, click links, or open attachments unless you recognize the
> sender and know the content is safe.
> >
> >
> > I'm having a bit of a problem and hope someone here can help. I'm trying
> > to separate individual items into specific logs, i.e. ssh events in
> > sshd.log, samba messages in samba.log, etc...
> >
> > I managed to come up with filters that pull out the events I started
> > with, and they are going into the correct log files. But they are ALSO
> > going into /var/log/messages even though I specifically have a filter on
> > that one that says not to include samba or sshd events. I'll copy my
> > config file here. Hopefully someone can tell me what I did wrong.
> >
> > Thanks!
> >
> > ---------------------------------------------
> > @version: 3.30
> >
> > @include "scl.conf"
> >
> > options {
> >       threaded(yes);
> >       chain_hostnames(no);
> >       stats_freq(43200);
> >       mark_freq(3600);
> > };
> >
> > source src { system(); internal(); };
> >
> > filter samba { program("samba"); };
> > filter ssh_messages { facility("AUTH") and level("INFO"); };
> > filter syslog { not filter("ssh_messages") and not filter("samba"); };
> >
> > destination console { file("/dev/tty12"); };
> > destination messages { file("/var/log/messages"); };
> > destination sshd_log { file("/var/log/sshd/sshd.log"); };
> > destination smb_logs { file("/var/log/samba/samba.log"); };
> >
> > log { source(src); destination(smb_logs); filter(samba); flags(final); );
> > log { source(src); destination(sshd_log); filter(ssh_messages);
> > flags(final); };
> > log { source(src); destination(console); filter(syslog); };
> > log { source(src); destination(messages); filter(syslog); };
> >
> >
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>
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