Provide canned policies

[alexjurkiewicz]

This module currently creates KMS keys with a policy stating "any IAM user/role can do anything with this key".

If you want a more restrictive policy, you have to write it yourself.

I think it would be valuable for the module to offer some canned policies that can be used instead.

This is a proposal for giving module users more flexible tools for controlling the key policy.

If you like the design, we can discuss the details, and I am interested in implementing it.

Expected Behavior

var.policy takes precedence over the below. If it is set, the other proposed variables are ignored.

var.canned_policy has a few options, like:

• aws-service-use (the key can only be attached to AWS resources, like RDS encryption)

var.extra_policy_statements lets you provide IAM Policy statements that will be appended to the policy. (It works with the default policy, and with all canned policies). For example:

extra_policy_statements = [
    {
        Sid = "Allow encryption by userupload app"
        Principal = {
            AWS = "arn:aws:iam...:role/userupload"
        }
        Action = "kms:Encrypt"
        Resource = "*"
    },
    {
        Sid = "Allow decryption by userdownload app"
        Principal = {
            AWS = "arn:aws:iam...:role/userdownload"
        }
        Action = "kms:Decrypt"
        Resource = "*"
    },
]

[jamengual]

this sounds soon to me. if you want send a PR over and we will review it.

[dstrates]

@alexjurkiewicz This module is still in need of a simple policy system. Any chance of getting PR #26 merged?

[alexjurkiewicz]

Sorry, I won't work on this further.

On Sun, 30 Oct 2022 at 18:49, dstrates @.***> wrote:

@alexjurkiewicz https://github.com/alexjurkiewicz This module is still in need of a simple policy system. Any chance of getting PR #26 https://github.com/cloudposse/terraform-aws-kms-key/pull/26 merged?

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