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userguide: document flow_id, with examples - v1 #9784

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userguide: document flow_id, with examples - v1 #9784

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177 changes: 176 additions & 1 deletion doc/userguide/output/eve/eve-json-format.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,174 @@ All the JSON log types share a common structure:
::


{"timestamp":"2009-11-24T21:27:09.534255","event_type":"TYPE", ...tuple... ,"TYPE":{ ... type specific content ... }}
{"timestamp":"2009-11-24T21:27:09.534255","flow_id":ID_NUMBER, "event_type":"TYPE", ...tuple... ,"TYPE":{ ... type specific content ... }}

Flow id
~~~~~~~

Correlates the network protocol EVE data and evidence that Suricata has logged to
an alert event and that alert's metadata, as well as fileinfo and flow logs, if
available.

The ability to correlate any existing evidence/logs to an alert and/ or the
ability to correlate all logs belonging to a specific session/flow was
introduced in 2014 by Suricata lead developer, Victor Julien (see `commit f1185d051c21
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I feel it's not necessary to do these kind of explicit attributions unless it's a contribution (git commit link is good though)

<https://github.com/OISF/suricata/commit/f1185d051c210ca0daacdddbe865a51af24f4ea3>`_).

Below, you can see an :ref:`alert<eve-format-alert>` for a ``TCP`` rule, and
following fileinfo, :ref:`http<eve-format-http>`, :ref:`anomaly<eve-format-anomaly>`
and :ref:`flow<eve-format-flow>` events, all easily correlated by using the ``flow_id`` EVE field::

{
"timestamp": "2016-07-13T22:42:07.199672+0000",
"flow_id": 1983488844015394,
"event_type": "alert",
"src_ip": "82.165.177.154",
"src_port": 80,
"dest_ip": "10.16.1.11",
"dest_port": 54186,
"proto": "TCP",
"pkt_src": "stream (flow timeout)",
"alert": {
"action": "allowed",
"gid": 1,
"signature_id": 2100498,
"rev": 7,
"signature": "GPL ATTACK_RESPONSE id check returned root",
"category": "Potentially Bad Traffic",
"severity": 2
},
"http": {
"http_port": 0,
"url": "/libhtp::request_uri_not_seen",
"http_content_type": "text/html",
"status": 200,
"length": 39
},
"files": [
{
"filename": "/libhtp::request_uri_not_seen",
"gaps": false,
"state": "CLOSED",
"stored": false,
"size": 39,
"tx_id": 0
}
],
"app_proto": "http",
"direction": "to_client",
"flow": {
"pkts_toserver": 0,
"pkts_toclient": 4,
"bytes_toserver": 0,
"bytes_toclient": 495,
"start": "2016-07-13T22:42:07.199672+0000",
"src_ip": "10.16.1.11",
"dest_ip": "82.165.177.154",
"src_port": 54186,
"dest_port": 80
}
}
{
"timestamp": "2016-07-13T22:42:07.199672+0000",
"flow_id": 1983488844015394,
"event_type": "fileinfo",
"src_ip": "82.165.177.154",
"src_port": 80,
"dest_ip": "10.16.1.11",
"dest_port": 54186,
"proto": "TCP",
"pkt_src": "stream (flow timeout)",
"http": {
"http_port": 0,
"url": "/libhtp::request_uri_not_seen",
"http_content_type": "text/html",
"status": 200,
"length": 39
},
"app_proto": "http",
"fileinfo": {
"filename": "/libhtp::request_uri_not_seen",
"gaps": false,
"state": "CLOSED",
"stored": false,
"size": 39,
"tx_id": 0
}
}
{
"timestamp": "2016-07-13T22:42:07.199672+0000",
"flow_id": 1983488844015394,
"event_type": "anomaly",
"src_ip": "82.165.177.154",
"src_port": 80,
"dest_ip": "10.16.1.11",
"dest_port": 54186,
"proto": "TCP",
"pkt_src": "stream (flow timeout)",
"tx_id": 0,
"anomaly": {
"app_proto": "http",
"type": "applayer",
"event": "UNABLE_TO_MATCH_RESPONSE_TO_REQUEST",
"layer": "proto_parser"
}
}
{
"timestamp": "2016-07-13T22:42:07.199672+0000",
"flow_id": 1983488844015394,
"event_type": "http",
"src_ip": "10.16.1.11",
"src_port": 54186,
"dest_ip": "82.165.177.154",
"dest_port": 80,
"proto": "TCP",
"pkt_src": "stream (flow timeout)",
"tx_id": 0,
"http": {
"http_port": 0,
"url": "/libhtp::request_uri_not_seen",
"http_content_type": "text/html",
"status": 200,
"length": 39
}
}
{
"timestamp": "2016-07-13T22:42:07.199672+0000",
"flow_id": 1983488844015394,
"event_type": "flow",
"src_ip": "10.16.1.11",
"src_port": 54186,
"dest_ip": "82.165.177.154",
"dest_port": 80,
"proto": "TCP",
"app_proto": "http",
"flow": {
"pkts_toserver": 0,
"pkts_toclient": 4,
"bytes_toserver": 0,
"bytes_toclient": 495,
"start": "2016-07-13T22:42:07.199672+0000",
"end": "2016-07-13T22:42:07.573103+0000",
"age": 0,
"state": "established",
"reason": "shutdown",
"alerted": true
},
"tcp": {
"tcp_flags": "1b",
"tcp_flags_ts": "10",
"tcp_flags_tc": "1b",
"syn": true,
"fin": true,
"psh": true,
"ack": true,
"state": "fin_wait1",
"ts_max_regions": 1,
"tc_max_regions": 1
}
}


Event types
~~~~~~~~~~~
Expand Down Expand Up @@ -86,6 +253,8 @@ generated the event.
omitted from internal "pseudo" packets such as flow timeout
packets.

.. _eve-format-alert:

Event type: Alert
-----------------

Expand Down Expand Up @@ -191,6 +360,8 @@ If pcap log capture is active in `multi` mode, a `capture_file` key will be adde
with value being the full path of the pcap file where the corresponding packets
have been extracted.

.. _eve-format-anomaly:

Event type: Anomaly
-------------------

Expand Down Expand Up @@ -304,6 +475,8 @@ Examples
}
}

.. _eve-format-http:

Event type: HTTP
----------------

Expand Down Expand Up @@ -1345,6 +1518,8 @@ Example of SSH logging:
}
}

.. _eve-format-flow:

Event type: Flow
----------------

Expand Down
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