Enrichers

Enrichers are parsers that can rely on external methods to provide extra contextual information to the event. The enrichers are usually in the s02-enrich stage (after most of the parsing happened).

Enrichers functions should all accept a string as a parameter, and return an associative string array, that will be automatically merged into the Enriched map of the Event.

warning

At the time of writing, enrichers plugin mechanism implementation is still ongoing (read: the list of available enrichment methods is currently hardcoded).

As an example let's look into the geoip-enrich parser/enricher :

It relies on the geolite2 data created by maxmind and the geoip2 golang module to provide the actual data.

It exposes a few methods : GeoIpCity GeoIpASN and IpToRange that are used by the postoverflow crowdsecurity/rdns and the parsers crowdsecurity/geoip-enrich and crowdsecurity/dateparse-enrich. Enrichers can be installed as any other parsers with the following command:

sudo cscli parsers install crowdsecurity/geoip-enrich

GeoIpCity

This method uses an Ip as an input, and tries to give information on this IP on return. It requires the maxmind database to be installed, which is done at the parser crowdsecurity/geoip-enrich installation. It will fill the fields Enriched.Isocode with county ISO code and Enrichred.IsInEU with the string true of false. It fills also Enriched.Latitude and Enriched.Longitude with the latitude and longitude.

GeoIpASN

This method uses an Ip as an input, and tries to give information on this IP on return. It requires the maxmind database to be installed, which is done at the parser crowdsecurity/geoip-enrich installation. This method fill the fields Enriched.ASNNUMBER and Enriched.ASNumber with the AS Number and Enriched.ASNOrg with the AS organiszation name

IpToRange

This method uses an Ip as an input, and tries to corresponding registered range on return. It requires the maxmind database to be installed, which is done at the parser crowdsecurity/geoip-enrich installation. The field Enriched.SourceRange is filled with the source range information.

reverse_dns

This methode uses an Ip as an input, and give the result of the reverse dns lookup. It fills the field Enriched.reverse_dns with the reverse dns information.

ParseDate

This method uses a date string as an input and tries to understand the date. This is used by the crowdsecurity/dateparse-enrich enricher to make crowdsec understand when the event took place. In case the date is not understood by crowdsec, the timestamp used is the time when the parsing is taking place.