turbot/aws_perimeter
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Control: EC2 AMIs should only be shared with trusted accounts

Description

AWS AMIs can be shared with specific AWS accounts without making the AMI public. This control checks if AMIs are shared with untrusted accounts.

Usage

Run the control in your terminal:

steampipe check aws_perimeter.control.ec2_ami_shared_with_trusted_accounts

Snapshot and share results via Steampipe Cloud:

steampipe login
steampipe check --share aws_perimeter.control.ec2_ami_shared_with_trusted_accounts

Plugins & Tables

Params

ArgsNameDefaultDescriptionVariable
$1trusted_accounts
["123456781234","123456781200"]
A list of trusted accounts.

SQL

with all_amis as (
select
title,
public,
launch_permissions,
region,
_ctx,
tags,
account_id
from
aws_ec2_ami
order by
account_id,
_ctx,
region,
tags,
title
),
ami_data as (
select
title,
public,
string_agg(lp ->> 'Group', ',') as public_access,
to_jsonb(
string_to_array(string_agg(lp ->> 'UserId', ','), ',')
) as shared_accounts,
to_jsonb(
string_to_array(string_agg(lp ->> 'UserId', ','), ',')
) - ($1) :: text [ ] as untrusted_accounts,
region,
_ctx,
tags,
account_id
from
all_amis,
jsonb_array_elements(launch_permissions) lp
group by
title,
public,
region,
_ctx,
account_id,
tags
),
evaluated_amis as (
select
all_amis.*,
public_access,
untrusted_accounts,
shared_accounts
from
all_amis
left join ami_data on all_amis.account_id = ami_data.account_id
and all_amis.region = ami_data.region
and all_amis.title = ami_data.title
)
select
title as resource,
case
when public then 'info'
when shared_accounts is null then 'ok'
when untrusted_accounts is not null then 'info'
else 'ok'
end as status,
case
when public then title || ' is public.'
when shared_accounts is null then title || ' is not shared.'
when untrusted_accounts is not null then title || case
when jsonb_array_length(untrusted_accounts) > 2 then concat(
' shared with untrusted accounts ',
untrusted_accounts #> > '{0}',
', ',
untrusted_accounts #> > '{1}',
' and ' || (jsonb_array_length(untrusted_accounts) - 2) :: text || ' more.'
)
when jsonb_array_length(untrusted_accounts) = 2 then concat(
' shared with untrusted accounts ',
untrusted_accounts #> > '{0}',
' and ',
untrusted_accounts #> > '{1}',
'.'
)
else concat(
' shared with untrusted account ',
untrusted_accounts #> > '{0}',
'.'
)
end
else title || ' shared with trusted account(s).'
end as reason,
region,
account_id
from
evaluated_amis;

Tags