Environment Variables Considered Harmful for Your Secrets
Installing secrets on disk exposes them to potential leakage through backups. This is a major issue, since much less attention is typically paid to access management for backups than to production servers. Therefore I support the approach of providing secrets through the environment.Once an application has been written to get its secrets from the environment, there is a question of how the secrets are obtained. They can be sourced from a file in an init script, but today we are seeing a lot of momentum towards containerized architecture, and the use of service discovery and configuration systems like etcd, zookeeper and consul.However, secrets require much more attention to security concerns than the data that these tools are designed to handle. Least privilege, separation of duties, encryption, and comprehensive audit are all necessary when dealing with secrets material. To this end, we have written a dedicated product which provides management and access for secrets and other infrastructure resources (e.g. SSH, LDAP, HTTP web services). The deployment model is similar to the HA systems provided by etcd, consul, SaltStack, etc. It's called Conjur (conjur.net).