Control: SNS topic policies should prohibit public access

powerpipe control run aws_compliance.control.sns_topic_policy_prohibit_public_access

powerpipe login
powerpipe control run aws_compliance.control.sns_topic_policy_prohibit_public_access --share

  with wildcard_action_policies as (
    select
      topic_arn,
      count(*) as statements_num
    from
      aws_sns_topic,
      jsonb_array_elements(policy_std -> 'Statement') as s
    where
      s ->> 'Effect' = 'Allow'
      -- aws:SourceOwner
      and s -> 'Condition' -> 'StringEquals' -> 'aws:sourceowner' is null
      and s -> 'Condition' -> 'StringEqualsIgnoreCase' -> 'aws:sourceowner' is null
      and (
        s -> 'Condition' -> 'StringLike' -> 'aws:sourceowner' is null
        or s -> 'Condition' -> 'StringLike' -> 'aws:sourceowner' ? '*'
    )
    -- aws:SourceAccount
    and s -> 'Condition' -> 'StringEquals' -> 'aws:sourceaccount' is null
    and s -> 'Condition' -> 'StringEqualsIgnoreCase' -> 'aws:sourceaccount' is null
    and (
      s -> 'Condition' -> 'StringLike' -> 'aws:sourceaccount' is null
      or s -> 'Condition' -> 'StringLike' -> 'aws:sourceaccount' ? '*'
    )
    -- aws:PrincipalOrgID
    and s -> 'Condition' -> 'StringEquals' -> 'aws:principalorgid' is null
    and s -> 'Condition' -> 'StringEqualsIgnoreCase' -> 'aws:principalorgid' is null
    and (
      s -> 'Condition' -> 'StringLike' -> 'aws:principalorgid' is null
      or s -> 'Condition' -> 'StringLike' -> 'aws:principalorgid' ? '*'
    )
    -- aws:PrincipalAccount
    and s -> 'Condition' -> 'StringEquals' -> 'aws:principalaccount' is null
    and s -> 'Condition' -> 'StringEqualsIgnoreCase' -> 'aws:principalaccount' is null
    and (
      s -> 'Condition' -> 'StringLike' -> 'aws:principalaccount' is null
      or s -> 'Condition' -> 'StringLike' -> 'aws:principalaccount' ? '*'
    )
    -- aws:PrincipalArn
    and s -> 'Condition' -> 'StringEquals' -> 'aws:principalarn' is null
    and s -> 'Condition' -> 'StringEqualsIgnoreCase' -> 'aws:principalarn' is null
    and (
      s -> 'Condition' -> 'StringLike' -> 'aws:principalarn' is null
      or s -> 'Condition' -> 'StringLike' -> 'aws:principalarn' ? '*'
    )
    and (
      s -> 'Condition' -> 'ArnEquals' -> 'aws:principalarn' is null
      or s -> 'Condition' -> 'ArnEquals' -> 'aws:principalarn' ? '*'
    )
    and (
      s -> 'Condition' -> 'ArnLike' -> 'aws:principalarn' is null
      or s -> 'Condition' -> 'ArnLike' -> 'aws:principalarn' ? '*'
    )
    -- aws:SourceArn
    and s -> 'Condition' -> 'StringEquals' -> 'aws:sourcearn' is null
    and s -> 'Condition' -> 'StringEqualsIgnoreCase' -> 'aws:sourcearn' is null
    and (
      s -> 'Condition' -> 'StringLike' -> 'aws:sourcearn' is null
      or s -> 'Condition' -> 'StringLike' -> 'aws:sourcearn' ? '*'
    )
    and (
      s -> 'Condition' -> 'ArnEquals' -> 'aws:sourcearn' is null
      or s -> 'Condition' -> 'ArnEquals' -> 'aws:sourcearn' ? '*'
    )
    and (
      s -> 'Condition' -> 'ArnLike' -> 'aws:sourcearn' is null
      or s -> 'Condition' -> 'ArnLike' -> 'aws:sourcearn' ? '*'
    )
    and (
      s -> 'Principal' -> 'AWS' = '["*"]'
      or s ->> 'Principal' = '*'
    )
  group by
    topic_arn
)
select
  t.topic_arn as resource,
  case
    when p.topic_arn is null then 'ok'
    else 'alarm'
  end as status,
  case
    when p.topic_arn is null then title || ' does not allow public access.'
    else title || ' contains ' || coalesce(p.statements_num,0) ||
    ' statements that allows public access.'
  end as reason
  
  , t.region, t.account_id
from
  aws_sns_topic as t
  left join wildcard_action_policies as p on p.topic_arn = t.topic_arn;