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Automatic Vault Token Injector

vault-token-injector

A loop to keep vault access tokens up-to-date in circleci and/or terraform cloud

Injects new tokens into circleci build environments or terraform cloud workspaces on startup and every 30 minutes. Also injects the VAULT_ADDR variable.

Configuration

An example configuration file is present here. Whatever circleci projects or terraform cloud workspaces are mentioned will update the given token_variable in the project workspace. The vault token for that project is created with the provided vault_role and/or vault_policies. In addition, the vault_address field is injected as the VAULT_ADDR environment variable.

Token TTL and Refresh Interval

The default token TTL is 60 minutes, and the default refresh interval is 30 minutes. This allows some overlap intentionally. If you wish to customize these numbers, you can set the following in your configuration:

token_ttl: 10m
token_refresh_interval: 1m

Logging

You can adjust the logging level with the -vX flag where X can be 1-10. WARNING - Log level 10 will output secrets into the logs for debugging scenarios. Please do not do this in a production environment.

Note that the time intervals are golang time.Duration strings

Future Planned Enhancements

  • Staggered token injections
  • Disable VAULT_ADDR injection
  • Use Vault API instead of vault binary
  • Prometheus endpoint to bubble up errors and successes