[syslog-ng] Parse client IP out of Proxy Protocol Line in TCP syslog->ELB->syslog-ng

[Budai, László]

Hi Nadine,

maybe this could help you:
https://guest.blogs.balabit.com/2015/09/processing-log-messages-with-python-in-syslog-ng/


regards,
L.


On Thu, Oct 15, 2015 at 7:28 PM, Nadine Miller <nadine.miller at defpoint.com>
wrote:

> I've searched through the archives and spent some time trying to find
> possible answers on the web, but haven't found a definitive answer.
>
> I'm in a situation where I need to parse syslog streams being
> forwarded through an AWS ELB. The normal configuration of the ELB
> resets the source IP to be the ELB's IP address. Logs are coming from
> multiple AWS VPCs, and we've already discovered duplicate hostnames
> across different VPCs, which has mingled logs from different hosts
> into one receiving log file.
>
> The ELB has another mode, referred to as "Proxy Protocol" which adds a
> single line to the TCP stream in the form:
>
> PROXY_STRING + single space + INET_PROTOCOL + single space + CLIENT_IP
> + single space + PROXY_IP + single space + CLIENT_PORT + single space
> + PROXY_PORT + "\r\n"
>
> Example:
>
> PROXY TCP4 198.51.100.22 203.0.113.7 35646 80\r\n
>
> Is it possible to use this proxy line in syslog-ng to properly
> segregate the log messages? If so, what would be the best method to
> use? I've done a lot of filtering/templating with normal UDP syslog
> and syslog-ng, but this is the first time I've had to consider
> something crazy like this.
>
> Currently there is no option at this time to change configurations at
> endpoints sending the  syslog messages, nor can we remove the ELB.
>
> For reference:
>
> http://docs.aws.amazon.com/ElasticLoadBalancing/latest/DeveloperGuide/enable-proxy-protocol.html
>
> Thanks in advance--
> =N=
>
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