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Problem this repo attempted to solve

We need to send logs from our mobile apps to a central log server for monitoring. It is essential that the mobile app send logs in a secured manner.

We uses Graylog as our log aggregator and monitoring.

The problem is Serilog graylog sink Serilog.Sinks.Graylog has no authentication mechanisin. This is probally due to the fact that graylog does not handle authentication and should not be exposed to a public end point.

The solution

We will get the mobile app to send logs to our http server, which then forward to graylog.

Serilog.Sinks.Http is an excellent choice.

how do we add authentication to our endpoint?

We will use a key as part of the url. The serilog will be assigned a url like https://example.com/serilog/my-key. my-key must match a key in appsettings.json below

"Keys": {
    "cfbf4a08-644b-4d21-9772-aaaa6c28e071": "app1.example.com",
    "13778cb6-3418-4e96-b3e2-f991302ad1df": "app2.example.com",
    "927d8245-5b93-49b8-bcec-e127b58f6116": "app3.example.com"
  },

From a given key, we can tell which app it is.

Other actors not knowing our keys will not be able to abuse the endpoint.

Integration

We uses docker compose to orchestrate the whole system consists of our http server, graylog, mongodb, and elastic search.

build

cd docker-support
docker compose build

run

cd docker-support
docker compose up -d

Configure Graylog to receive GELF HTTP

  1. Open graylog UI at https://localhost:9000 and login
  2. Navigate to System > Inputs
  3. Add a GELF HTTP input