GOCT

Yet another Certificate Transparency monitor and checker.

And yet another project written just to learn one more programming language, but might be helpful for somebody :)

Features

1. Custom checks support with custom configs
2. Configs which covers different types of CT logs
3. Runs without database
4. Could be deployed as cloud func like AWS Lambda

Ideas for checks

• Regex matches for CN's
• Invalid (corrupted) certificates
• Absence of log entries in several national CT logs

How to run:

• Run checks by default and exit (could be used as cloud function by cron)

TELEGRAM_APITOKEN=... DEBUG=false VERBOSE=false ./goct --config config.yaml

• Run as a daemon (all checks will be performed every rescan value in seconds)

TELEGRAM_APITOKEN=... VERBOSE=false ./goct daemon --rescan 3600 --config config.yaml

Daemon mode also supports simple http healthchecks on localhost:8081/ping

• Run as cli

./goct cli --config config.yaml --logUri https://ctlog2024.mail.ru/nca2024/ --lookupDepth 175

Config example:

---
version: 1
verbose: false
numWorkers: 1
batchSize: 100
daemon: false
checks:
  - name: match_by_regexp
    regex:
      - ".*bank.*"
      # re2 regexp to filter out domains with *.ru zone
      # - $.+(.{0,4}$)|(\.[^r].{0,2}$)|(\.r[^u].{0,2}$)|(\.ru.{1,4})$
    logs:
      - "https://ct.googleapis.com/logs/us1/argon2024/"
    lookupDepth: 24 #hours
  - name: invalid_cert
    logs:
      - "https://ct-agate.yandex.net/2024"
      # - "https://ct.googleapis.com/logs/us1/argon2024/"
    lookupDepth: 24
  - name: recently_issued_cert
    logs:
      # - "https://ct-agate.yandex.net/2024"
      - "https://ctlog2024.mail.ru/nca2024/"
      # - "https://ct.googleapis.com/logs/us1/argon2024/"
    lookupDepth: 1
    lookupDelta: 100

store:
  - type: "sqlite"
    tableName: "certs"
    uri: "file://tmp/1.db"
    flush: true

notifications:
  - type: telegram
    recipients:
    # telegram chat ids
      - 1337

TODO's

• Generic secrets provisioning (not only through env's)
• More notifications clients (not only telegram)
• More DB's clients (not only sqlite)
• Your issue :)