ACM.22 When a KMS key’s solely used with Secrets and techniques Supervisor, restrict its use with a situation in your Key Coverage
In earlier posts, I defined that I’m going to create credentials related to a digital MFA machine and retailer them in AWS Secrets and techniques Supervisor.
For secrets and techniques saved in Secrets and techniques Supervisor, we will additional prohibit our KSM Key coverage to solely enable encryption and decryption and sure different actions through the Secrets and techniques Supervisor service as described right here:
I defined how situations work in AWS IAM insurance policies right here. We are able to additionally use situations in useful resource insurance policies.
The situation seems like this in json, however we’ll convert it to yaml in our templates. You may prohibit to a selected area through service endpoint (us-west-2 under) and a selected account quantity through the CallerAccount.
As I discussed, I’m utilizing a stand-alone account for KMS. Which means I’d need to know the opposite account and area the place the important thing will likely be used earlier than deploying this coverage. I’ll have to cross these in as parameters. For now, I’m defaulting to the present area and account ID for testing functions.
Within the pattern coverage, AWS is just making use of this restriction to the next actions:
"Motion" : [ "kms:Decrypt", "kms:ReEncrypt*", "kms:GenerateDataKey*", "kms:CreateGrant", "kms:DescribeKey" ]
The coverage doesn’t implement the situation on the next actions:
"Motion" : [ "kms:Describe*", "kms:Get*", "kms:List*", "kms:RevokeGrant" ]
For our functions, we solely have DescribeKey in our coverage and some of the opposite actions. Let’s transfer DescribeKey to a single assertion and permit each our encrypt and decrypt person to name that with out Secrets and techniques Supervisor.
Then we will add the situation for all the remainder of the actions. We are able to revise the coverage additional so as to add actions or change our situation later if we have to after testing it.
There are much more particulars on how Secrets and techniques Supervisor makes use of KMS within the documentation if you wish to dive into the main points of how Secrets and techniques Supervisor works with and makes use of KMS.
One factor we’ll have to determine later is that if the hot button is not getting used with KMS — for instance, if it’s used with S3 — then how does that have an effect on our coverage. TBD.
Yow will discover the KMS coverage within the kms listing of the related GitHub repo. I’m storing every little thing in a separate listing for KMS as a result of, as defined within the prior submit on KMS structure, that may all be transferring to a separate account ultimately.
Word that I’m in no way accomplished with this KMS coverage. The code you see within the GitHub repo seems totally different as a result of I’m simply writing these weblog posts as I write the code and the later revisions will likely be coated in future posts the place I made the modifications.
Observe me for updates.
Teri Radichel
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