Control: Compute Instances should restrict service account impersonate permission

Description

This control ensures that Compute Instance does not allow service account impersonate permissions.

Usage

Run the control in your terminal:

powerpipe control run gcp_compliance.control.compute_instance_no_service_account_impersonate_permission

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run gcp_compliance.control.compute_instance_no_service_account_impersonate_permission --share

SQL

This control uses a named query:

with role_with_service_account_impersonate_permission as (
  select
    distinct name,
    project
  from
    gcp_iam_role,
    jsonb_array_elements_text(included_permissions) as p
  where
    not is_gcp_managed
    and p in (
      'iam.serviceAccounts.getAccessToken',
      'iam.serviceAccounts.signBlob',
      'iam.serviceAccounts.signJwt',
      'iam.serviceAccounts.implicitDelegation',
      'iam.serviceAccounts.getOpenIdToken',
      'iam.serviceAccounts.actAs'
    )
),
policy_with_service_account_impersonate_permission as (
  select
    distinct entity,
    project
  from
    gcp_iam_policy,
    jsonb_array_elements(bindings) as p,
    jsonb_array_elements_text(p -> 'members') as entity
  where
    p ->> 'role' in ('roles/iam.securityAdmin')
    or p ->> 'role' in (
      select
        name
      from
        role_with_service_account_impersonate_permission
    )
),
compute_instance_with_service_account_impersonate_permission as (
  select
    distinct self_link
  from
    gcp_compute_instance as i,
    jsonb_array_elements(service_accounts) as e
    left join policy_with_service_account_impersonate_permission as b on b.entity = concat('serviceAccount:' || (e ->> 'email'))
  where
    b.entity is not null
)
select
  i.self_link as resource,
  case
    when p.self_link is not null then 'alarm'
    else 'ok'
  end as status,
  case
    when p.self_link is not null then i.title || ' allow service account impersonate permission.'
    else i.title || ' restrict service account impersonate permission.'
  end as reason,
  location as location,
  project as project
from
  gcp_compute_instance as i
  left join compute_instance_with_service_account_impersonate_permission as p on p.self_link = i.self_link;

Control: Compute Instances should restrict service account impersonate permission

Description

Usage

SQL

Tags