Micro Focus ArcSight Logger via Fluentd¶

Example overview¶

Webhooks can be used as system log sources. The number of log sources depends on the system complexity: the more components in the system, the greater number of log sources and logs. The most common logging scheme in complex systems consists of the following components:

• Log collector: accepts logs from several sources and forwards logs to the SIEM system

• SIEM system: used to analyze logs and monitor the system status

In the provided example, events are sent via webhooks to the Fluentd log collector and forwarded to the ArcSight Logger system.

Used resources¶

• ArcSight Logger 7.1 with the WEB URL https://192.168.1.73:443 installed on CentOS 7.8

• Fluentd installed on Debian 10.4 (Buster) and available on https://192.168.1.65:9880

• Administrator access to Wallarm Console in EU cloud to configure the webhook integration

Since the links to the ArcSight Logger and Fluentd services are cited as examples, they do not respond.

ArcSight Logger configuration¶

ArcSight Logger has logs receiver Wallarm Fluentd logs configured as follows:

• Logs are received via UDP (Type = UDP Receiver)

• Listening port is 514

• Events are parsed with the syslog parser

• Other default settings

To get a more detailed description of the receiver configuration, please download the Logger Installation Guide of an appropriate version from the official ArcSight Logger documentation.

Fluentd configuration¶

Fluentd is configured in the td-agent.conf file:

• Incoming webhook processing is configured in the source directive:

  • Traffic is sent to port 9880
  • Fluentd is configured to accept only HTTPS connections
  • Fluentd TLS certificate signed by a publicly trusted CA is located within the file /etc/ssl/certs/fluentd.crt
  • Private key for TLS certificate is located within the file /etc/ssl/private/fluentd.key

• Forwarding logs to ArcSight Logger and log output are configured in the match directive:

  • All event logs are copied from Fluentd and forwarded to ArcSight Logger at the IP address https://192.168.1.73:514
  • Logs are forwarded from Fluentd to ArcSight Logger in the JSON format according to the Syslog standard
  • Connection with ArcSight Logger is established via UDP
  • Fluentd logs are additionally printed on the command line in JSON format (19-22 code lines). The setting is used to verify that events are logged via Fluentd

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<source>
  @type http # input plugin for HTTP and HTTPS traffic
  port 9880 # port for incoming requests
  <transport tls> # configuration for connections handling
    cert_path /etc/ssl/certs/fluentd.crt
    private_key_path /etc/ssl/private/fluentd.key
  </transport>
</source>
<match **>
  @type copy
  <store>
      @type remote_syslog # output plugin to forward logs from Fluentd via Syslog
      host 192.168.1.73 # IP address to forward logs to
      port 514 # port to forward logs to
      protocol udp # connection protocol
    <format>
      @type json # format of forwarded logs
    </format>
  </store>
  <store>
     @type stdout # output plugin to print Fluentd logs on the command line
     output_type json # format of logs printed on the command line
  </store>
</match>

A more detailed description of configuration files is available in the official Fluentd documentation.

Testing Fluentd configuration

To check that Fluentd logs are created and forwarded to ArcSight Logger, the PUT or POST request can be sent to Fluentd.

Request example:

curl -X POST 'https://192.168.1.65:9880' -H "Content-Type: application/json" -d '{"key1":"value1", "key2":"value2"}'

Fluentd logs:

Event in ArcSight Logger:

Configuration of webhook integration¶

• Webhooks are sent to https://192.168.1.65:9880

• Webhooks are sent via POST requests

• Additional authentication parameter X-Auth-Token is passed in the request

• Webhooks sent to Webhook URLs are all available events: hits, system events, vulnerabilities, scope changes

Example testing¶

To test the configuration, a new user is added in Wallarm Console:

Fluentd will log the event as follows:

The following entry will be displayed in ArcSight Logger events: