PostgreSQL database secrets engine

PostgreSQL is one of the supported plugins for the database secrets engine. This plugin generates database credentials dynamically based on configured roles for the PostgreSQL database, and also supports Static Roles.

See the database secrets engine docs for more information about setting up the database secrets engine.

The PostgreSQL secrets engine uses pgx, the same database library as the PostgreSQL storage backend. Connection string options, including SSL options, can be found in the pgx and PostgreSQL connection string documentation.

Capabilities

Plugin Name	Root Credential Rotation	Dynamic Roles	Static Roles	Username Customization
postgresql-database-plugin	Yes	Yes	Yes	Yes (1.7+)

Setup

1. Enable the database secrets engine if it is not already enabled:

   $ bao secrets enable database
   Success! Enabled the database secrets engine at: database/

   By default, the secrets engine will enable at the name of the engine. To enable the secrets engine at a different path, use the -path argument.

2. Configure OpenBao with the proper plugin and connection information:

   $ bao write database/config/my-postgresql-database \
       plugin_name="postgresql-database-plugin" \
       allowed_roles="my-role" \
       connection_url="postgresql://{{username}}:{{password}}@localhost:5432/database-name" \
       username="openbaouser" \
       password="openbaopass" \
       password_authentication="scram-sha-256"

3. Configure a role that maps a name in OpenBao to an SQL statement to execute to create the database credential:

   $ bao write database/roles/my-role \
       db_name="my-postgresql-database" \
       creation_statements="CREATE ROLE \"{{name}}\" WITH LOGIN PASSWORD '{{password}}' VALID UNTIL '{{expiration}}'; \
           GRANT SELECT ON ALL TABLES IN SCHEMA public TO \"{{name}}\";" \
       default_ttl="1h" \
       max_ttl="24h"
   Success! Data written to: database/roles/my-role

Usage

After the secrets engine is configured and a user/machine has an OpenBao token with the proper permission, it can generate credentials.

1. Generate a new credential by reading from the /creds endpoint with the name of the role:

   $ bao read database/creds/my-role
   Key                Value
   ---                -----
   lease_id           database/creds/my-role/2f6a614c-4aa2-7b19-24b9-ad944a8d4de6
   lease_duration     1h
   lease_renewable    true
   password           SsnoaA-8Tv4t34f41baD
   username           v-openbaouse-my-role-x

API

The full list of configurable options can be seen in the PostgreSQL database plugin API page.

For more information on the database secrets engine's HTTP API please see the Database secrets engine API page.