Secure eStreamer Client (f.k.a. eNcore) for Splunk is a plugin based eStreamer client built from scratch in Python designed to deliver fully qualified event data to Splunk from Secure Firewall (f.k.a. Firepower) 6.x platforms. If you have experienced problems getting the Cisco eStreamer for Splunk app version 2.2.1 and 2.2.2 working with Secure Firewall 6.x you should move to this new application so that you can leverage the many improvements listed below.
Secyre eStreamer Client for Splunk is a Technical Add-on (TA) designed purely to collect data and be installed on a forwarder.
New in this solution:
Resolved Issues in V 3.5.0
Added support for Splunk status in .splencore.sh script
Fixed App Inspect failure due to no default settings in app.conf for estreamer.conf reload triggers
*Added additional error handling for local cache storage
*Fixed bug associated with "JSON settings error" in estreamer.log which would periodically stop the encore process since the configuration file could not be read into memory.
*Specifically modified the 'stop' command to safely terminate existing estreamer python connections to the FMC
More Detail: This latest update, v4.8.1 in Splunkbase, should provide more robust handling of the FMC connection, and eliminate the "JSON settings error" from the encore logs. Additionally, we have created CSCvz51007 to address the potential FMC condition of reaching too many client connections. I would highly encourage an update to 4.8.1 if you are seeing any timeout issues, as always please reach out to our mailer here if you are experiencing problems or create a Cisco Support TAC case so we can promptly investigate.
*Modified the ./splencore.sh stop command to wait for TCP termination vs pkill, this is likely the issue behind "JSON settings" error and additional idle timeouts as the FMC server was receiving multiple session requests before older sessions were properly terminated
*Fixed incorrect value in the disposition field for malware events
*Fixed incorrect disposition field value in malware events
Fixed errors in the stop command which not consistently terminate encore processes and remove pid files
Modified handling of XFF events
*Modified clean script which is believed to cause issues with the bug "Invalid JSON settings"
*Updated stop script for multi-thread mode
Added additional transforms to the props.conf to support dashboard 1.60 updates
Modified the stop utility to remove temporary pid file and terminate all estreamer client processes, whereas in versions this only worked in single thread mode
Added support for VPN connection events, record types 170/171, user login/logoff attempts
Added additional fields to support XFF HTTP URI events
Fixed encoding bug "UnicodeEncodeError: 'ascii' codec can't encode character u'\xa0' in position 20: ordinal not in range(128)"
Updated multiple rec types with src_host_ip field, this requires FMC host discovery policy to be set
Added "src_host" field to multiple record types, this field provides traceability do the original host ip.
Removed ORIGINAL SOURCE IP error, this potentially would cause applications errors due to the reference of a non-existent data type. Please reference the full setup guide for Splunk 8.0/Cloud changes
Splunk 8.0 release, please see full guide for install/setup details
reordered event format to include time in the beginning of the record, reset default MAX_LOOKAHEAD accordingly for increased performance
Encore version 3.x support only legacy Splunk 7.x with python2
Modified event structure to include event_sec in the beginning of the record for increased performance
*Added additional ipv6 formatting for XFF events
Corrected performance issues associated with outputting various pcap data types, this feature will be revised and re-released in a future version
Modified definition of event_sec for connection events, in the FMC all connection events start at first packet time which is now the value used for indexing. The first_pkt_sec field is still preserved to support backward compatibility.
*Fixed bug with the initiatorIpAddress field in correlation events
This is the rewrite for the SourceFire eStreamer client.
The Cisco Event Streamer (also known as eStreamer) allows you to stream System intrusion,
discovery, and connection data from Firepower Management Center or managed device (also
referred to as the eStreamer server) to external client applications.
eStreamer responds to client requests with terse, compact, binary encoded messages – this
keeps it fast
eNcore is a new all-purpose client which requests all possible events from eStreamer, parses
the binary content and outputs events in various formats to support other SIEMs
*Updates for 3.5.8
*Bug fix - microseconds on pcap data now use the proper field name 'upacket_sec', and seconds use 'packet_sec'
Version 3.5.7 Updates
*Added back aliasing for action/blocked fields
Version 3.5.6 Updates
Removed default disabling of the cisco:estreamer:data source type
Removed duplicate aliasing for action/blocked fields
eNcore v3.5.3 resolves issues with previous v3.5.x versions where eNcore would crash under certain conditions.
All eNcore v3.5.x versions provide significant performance enhancements over pre-v3.5 versions.
eNcore version 3.5.0 features performance improvements – the ability to process a significantly higher event rate. This improvement requires no additional configuration on the part of the user.
However, if the eNcore platform has four or more cores, then additional performance improvement can be gained by adjusting a parameter in the configuration file, estreamer.conf. This parameter is called “workerProcesses” and is highlighted below:
--- rest of config file omitted ---
The highlighted line shows the “workerProcesses” to be set at 4. It can be set anywhere from 4-12, but with four or more cores, testing showed the best performance when set to 12.
See Details section for more Release Notes on Version 3.5.0
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