jc/docs/parsers/cef.md

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jc.parsers.cef

jc - JSON Convert CEF string parser

This parser conforms to the Microfocus Arcsight CEF specification. If you require special handling for your CEF input, you can copy this parser code to the jc pluggin directory for your system and modify it to suit your needs.

This parser will accept a single CEF string or multiple CEF string lines. Any text before "CEF" will be ignored. Syslog and CEF escaped characters (\\, \\", \\], \\|, \\=, \\%, ``\#, \\n, \\r) are unescaped.

Extended fields, as defined in the CEF specification, are relabeled and the values are converted to their respective types. Extra naive and UTC epoch timestamps are added where appropriate per the CEF specification.

To preserve escaping, original keynames, and value types use the --raw or raw=True option in the parse() function.

Usage (cli):

$ echo 'CEF:0|Vendor|Product|3.2.0|1|SYSTEM|1|... | jc --cef

Usage (module):

import jc
result = jc.parse('cef', cef_string_output)

Schema:

See: https://www.microfocus.com/documentation/arcsight/arcsight-smartconnectors-8.3/cef-implementation-standard/Content/CEF/Chapter%201%20What%20is%20CEF.htm

Note: Special characters in key names will be converted to underscores.

[
  {
    "deviceVendor":                   string,
    "deviceProduct":                  string,
    "deviceVersion":                  string,
    "deviceEventClassId":             string,
    "name":                           string,
    "agentSeverity":                  string/integer,
    "agentSeverityString":            string,
    "agentSeverityNum":               integer,
    "CEF_Version":                    integer,
    <extended fields>                 string/integer/float,  # [0]
    <extended fields>"_epoch":        integer,  # [1]
    <extended fields>"_epoch_utc":    integer,  # [2]
    <custom fields>                   string
  }
]

[0] Will attempt to convert extended fields to the type specified in the
    CEF specification. If conversion fails, then the field will remain
    a string.
[1] Naive calculated epoch timestamp
[2] Timezone-aware calculated epoch timestamp. (UTC only) This value
    will be null if a UTC timezone cannot be extracted from the original
    timestamp string value.

Examples:

$ cef | jc --cef -p
[
  {
    "deviceVendor": "Trend Micro",
    "deviceProduct": "Deep Security Agent",
    "deviceVersion": "<DSA version>",
    "deviceEventClassId": "4000000",
    "name": "Eicar_test_file",
    "agentSeverity": 6,
    "CEF_Version": 0,
    "dvchost": "hostname",
    "string": "hello \"world\"!",
    "start": "Nov 08 2020 12:30:00.111 UTC",
    "start_epoch": 1604867400,
    "start_epoch_utc": 1604838600,
    "Host_ID": 1,
    "Quarantine": 205,
    "myDate": "Nov 08 2022 12:30:00.111",
    "myDate_epoch": 1667939400,
    "myDate_epoch_utc": null,
    "myFloat": 3.14,
    "agentSeverityString": "Medium",
    "agentSeverityNum": 6
  }
]

$ cef | jc --cef -p -r
[
  {
    "deviceVendor": "Trend Micro",
    "deviceProduct": "Deep Security Agent",
    "deviceVersion": "<DSA version>",
    "deviceEventClassId": "4000000",
    "name": "Eicar_test_file",
    "agentSeverity": "6",
    "CEF_Version": "0",
    "cn1": "1",
    "cn1Label": "Host ID",
    "dvchost": "hostname",
    "cn2": "205",
    "cn2Label": "Quarantine",
    "string": "hello \\\"world\\\"!",
    "start": "Nov 08 2020 12:30:00.111 UTC",
    "deviceCustomDate1": "Nov 08 2022 12:30:00.111",
    "deviceCustomDate1Label": "myDate",
    "cfp1": "3.14",
    "cfp1Label": "myFloat"
  }
]

parse

def parse(data: str, raw: bool = False, quiet: bool = False) -> List[Dict]

Main text parsing function

Parameters:

data:        (string)  text data to parse
raw:         (boolean) unprocessed output if True
quiet:       (boolean) suppress warning messages if True

Returns:

List of Dictionaries. Raw or processed structured data.

Parser Information

Compatibility: linux, darwin, cygwin, win32, aix, freebsd

Version 1.0 by Kelly Brazil (kellyjonbrazil@gmail.com)