suite: per-user CREATEROLE attribute

# users.<name>.createRole grants the CREATEROLE role attribute to a managed login
# user, so a tenant can create and manage its own roles without the postgres
# superuser. Role attributes are not inherited through role membership, so the
# attribute cannot be carried by the generated <db>_admin group role and has to be
# set on the login user itself.
#
# The attribute is reconciled on every run of the init script: flipping createRole
# back to false emits NOCREATEROLE and revokes it.
#
# The guard on PostgreSQL 16 is a security boundary, not a cosmetic check. Before
# PostgreSQL 16, CREATEROLE allowed granting membership in any non-superuser role,
# so a user holding it could grant itself pg_execute_server_program and reach
# command execution on the instance. PostgreSQL 16 restricted CREATEROLE to roles
# the grantee administers, which is what makes the attribute safe to expose.

templates:
  - templates/init-script.yaml

release:
  name: pg-test
  namespace: tenant-test

set:
  _cluster:
    scheduling: {}

tests:
  - it: "user is NOCREATEROLE by default"
    set:
      users:
        app: {}
    documentIndex: 1
    asserts:
      - matchRegex:
          path: stringData["init.sh"]
          pattern: 'ALTER ROLE "app" WITH PASSWORD .* NOREPLICATION NOCREATEROLE NOBYPASSRLS;'

  - it: "createRole=true emits CREATEROLE"
    set:
      version: v18
      users:
        app:
          createRole: true
    documentIndex: 1
    asserts:
      - matchRegex:
          path: stringData["init.sh"]
          pattern: 'ALTER ROLE "app" WITH PASSWORD .* NOREPLICATION CREATEROLE NOBYPASSRLS;'

  - it: "createRole=false emits NOCREATEROLE so the attribute is revoked"
    set:
      version: v18
      users:
        app:
          createRole: false
    documentIndex: 1
    asserts:
      - matchRegex:
          path: stringData["init.sh"]
          pattern: 'ALTER ROLE "app" WITH PASSWORD .* NOCREATEROLE NOBYPASSRLS;'

  - it: "createRole composes with replication"
    set:
      version: v18
      users:
        app:
          replication: true
          createRole: true
    documentIndex: 1
    asserts:
      - matchRegex:
          path: stringData["init.sh"]
          pattern: 'ALTER ROLE "app" WITH PASSWORD .* REPLICATION CREATEROLE NOBYPASSRLS;'

  - it: "createRole on PostgreSQL 15 fails fast"
    set:
      version: v15
      users:
        app:
          createRole: true
    asserts:
      - failedTemplate:
          errorMessage: "SECURITY: users.app.createRole requires PostgreSQL 16 or newer. On PostgreSQL 15 and older, a role holding CREATEROLE can grant itself any non-superuser role, including pg_execute_server_program, which escalates to command execution on the instance."

  - it: "createRole on PostgreSQL 13 fails fast"
    set:
      version: v13
      users:
        app:
          createRole: true
    asserts:
      - failedTemplate:
          errorMessage: "SECURITY: users.app.createRole requires PostgreSQL 16 or newer. On PostgreSQL 15 and older, a role holding CREATEROLE can grant itself any non-superuser role, including pg_execute_server_program, which escalates to command execution on the instance."

  - it: "PostgreSQL 15 renders fine as long as createRole is not requested"
    set:
      version: v15
      users:
        app: {}
    documentIndex: 1
    asserts:
      - matchRegex:
          path: stringData["init.sh"]
          pattern: 'ALTER ROLE "app" WITH PASSWORD .* NOCREATEROLE NOBYPASSRLS;'

  - it: "bypassRls=true emits BYPASSRLS"
    set:
      version: v18
      users:
        app:
          bypassRls: true
    documentIndex: 1
    asserts:
      - matchRegex:
          path: stringData["init.sh"]
          pattern: 'ALTER ROLE "app" WITH PASSWORD .* NOCREATEROLE BYPASSRLS;'

  - it: "bypassRls composes with createRole, which is what provisioning a privileged service role needs"
    set:
      version: v18
      users:
        app:
          createRole: true
          bypassRls: true
    documentIndex: 1
    asserts:
      - matchRegex:
          path: stringData["init.sh"]
          pattern: 'ALTER ROLE "app" WITH PASSWORD .* CREATEROLE BYPASSRLS;'

  - it: "bypassRls is allowed on PostgreSQL 15, it carries no escalation path of its own"
    set:
      version: v15
      users:
        app:
          bypassRls: true
    documentIndex: 1
    asserts:
      - matchRegex:
          path: stringData["init.sh"]
          pattern: 'ALTER ROLE "app" WITH PASSWORD .* NOCREATEROLE BYPASSRLS;'

  - it: "createRole sets createrole_self_grant so the attribute is usable"
    set:
      version: v18
      users:
        app:
          createRole: true
    documentIndex: 1
    asserts:
      - matchRegex:
          path: stringData["init.sh"]
          pattern: "ALTER ROLE \"app\" SET createrole_self_grant = 'set, inherit';"

  - it: "withdrawing createRole resets createrole_self_grant"
    set:
      version: v18
      users:
        app:
          createRole: false
    documentIndex: 1
    asserts:
      - matchRegex:
          path: stringData["init.sh"]
          pattern: 'ALTER ROLE "app" RESET createrole_self_grant;'