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Nightfall

The Nightfall filter scans logs for sensitive data and redacts any sensitive portions. This filter supports scanning for various sensitive information, ranging from API keys and Personally Identifiable Information (PII) to custom regular expressions you define. You can configure what to scan for in theNightfall Dashboard.

This filter isn't enabled by default in version 1.9.0 due to a typo. To enable it, set the flag -DFLB_FILTER_NIGHTFALL=ON when building. This is fixed for versions 1.9.1 and later.

Configuration parameters

The plugin supports the following configuration parameters:

Key
Description
Default

nightfall_api_key

The Nightfall API key to scan your logs with, obtainable from the Nightfall Dashboard

none

policy_id

The Nightfall developer platform policy to scan your logs with, configurable in the Nightfall Dashboard.

none

sampling_rate

The rate controlling how much of your logs you wish to be scanned. Must be a float between (0,1]. 1 means all logs will be scanned. Use this setting to avoid rate limits in conjunction with Fluent Bit match rules.

1

tls.debug

Debug level between 0 (nothing) and 4 (every detail).

0

tls.verify

When enabled, turns on certificate validation when connecting to the Nightfall API.

true

tls.ca_path

Absolute path to root certificates, required if tls.verify is true.

none

Configuration file

The following is an example of a configuration file for the Nightfall filter:

[INPUT]
    name http
    host 0.0.0.0
    port 8000

[FILTER]
    Name nightfall
    Match *
    nightfall_api_key <API key>
    policy_id 5991946b-1cc8-4c38-9240-72677029a3f7
    sampling_rate 1
    tls.ca_path /etc/ssl/certs

[OUTPUT]
    Name stdout

Command line

After you configure the filter, you can use the it from the command line by running a command like:

bin/fluent-bit -c /PATH_TO_CONF_FILE/fluent-bit.conf

Replace PATH_TO_CONF_FILE with the path for where your filter configuration file is located.

Which results in output like:

[2022/02/09 19:46:22] [ info] [engine] started (pid=53844)
[2022/02/09 19:46:22] [ info] [storage] version=1.1.5, initializing...
[2022/02/09 19:46:22] [ info] [storage] in-memory
[2022/02/09 19:46:22] [ info] [storage] normal synchronization mode, checksum disabled, max_chunks_up=128
[2022/02/09 19:46:22] [ info] [cmetrics] version=0.2.2
[2022/02/09 19:46:22] [ info] [input:http:http.0] listening on 0.0.0.0:8000
[2022/02/09 19:46:22] [ info] [sp] stream processor started
[2022/02/09 19:46:30] [ info] [filter:nightfall:nightfall.0] Nightfall request http_do=0, HTTP Status: 200
[0] app.log: [1644464790.280412000, {"A"=>"there is nothing sensitive here", "B"=>[{"A"=>"my credit card number is *******************"}, {"A"=>"*********** is my social security."}], "C"=>false, "D"=>"key ********************"}]
[2022/02/09 19:47:25] [ info] [filter:nightfall:nightfall.0] Nightfall request http_do=0, HTTP Status: 200
[0] app.log: [1644464845.675431000, {"A"=>"a very safe string"}]

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