CheckList

The following plugin looks up if a value in a specified list exists and then allows the addition of a record to indicate if found. Introduced in version 1.8.4

Configuration Parameters

The plugin supports the following configuration parameters

Key	Description
file	The single value file that Fluent Bit will use as a lookup table to determine if the specified lookup_key exists
lookup_key	The specific key to look up and determine if it exists, supports record accessor
record	The record to add if the lookup_key is found in the specified file. Note you may add multiple record parameters.

Example Configuration

[INPUT]
    name           tail
    tag            test1
    path           test1.log
    read_from_head true
    parser         json

[FILTER]
    name       checklist
    match      test1
    file       ip_list.txt
    lookup_key $remote_addr
    record     ioc    abc
    record     badurl null
    log_level  debug

[OUTPUT]
    name       stdout
    match      test1

In the following configuration we will read a file test1.log that includes the following values

{"remote_addr": true, "ioc":"false", "url":"https://badurl.com/payload.htm","badurl":"no"}
{"remote_addr": "7.7.7.2", "ioc":"false", "url":"https://badurl.com/payload.htm","badurl":"no"}
{"remote_addr": "7.7.7.3", "ioc":"false", "url":"https://badurl.com/payload.htm","badurl":"no"}
{"remote_addr": "7.7.7.4", "ioc":"false", "url":"https://badurl.com/payload.htm","badurl":"no"}
{"remote_addr": "7.7.7.5", "ioc":"false", "url":"https://badurl.com/payload.htm","badurl":"no"}
{"remote_addr": "7.7.7.6", "ioc":"false", "url":"https://badurl.com/payload.htm","badurl":"no"}
{"remote_addr": "7.7.7.7", "ioc":"false", "url":"https://badurl.com/payload.htm","badurl":"no"}

Additionally, we will use the following lookup file which contains a list of malicious IPs (ip_list.txt)

1.2.3.4
6.6.4.232
7.7.7.7

In the configuration we are using $remote_addr as the lookup key and 7.7.7.7 is malicious. This means the record we would output for the last record would look like the following

{"remote_addr": "7.7.7.7", "ioc":"abc", "url":"https://badurl.com/payload.htm","badurl":"null"}