Control: IAM role trust policies should prohibit public access

powerpipe control run aws_perimeter.control.iam_role_trust_policy_prohibit_public_access

powerpipe login
powerpipe control run aws_perimeter.control.iam_role_trust_policy_prohibit_public_access --share

with wildcard_action_policies as (
  select
    arn,
    count(*) as statements_num
  from
    aws_iam_role,
    jsonb_array_elements(assume_role_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
    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
    and (
      s -> 'Condition' -> 'ArnLike' -> 'aws:sourcearn' is null
      or s -> 'Condition' -> 'ArnLike' -> 'aws:sourcearn' ? '*'
    )
    and (
      s -> 'Principal' -> 'AWS' = '["*"]'
      or s ->> 'Principal' = '*'
    )
  group by
    arn
)
select
  r.arn as resource,
  case
    when p.arn is null then 'ok'
    else 'alarm'
  end as status,
  case
    when p.arn is null then title || ' trust policy does not allow public access.'
    else title || ' trust policy contains ' || coalesce(p.statements_num, 0) ||
    ' statement(s) that allow public access.'
  end as reason
  
  , r.region, r.account_id
from
  aws_iam_role as r
  left join wildcard_action_policies as p on p.arn = r.arn;