DataMasque-AWS-Cross-Account-Bucket-Access/datamasque-s3-bucket-access-iam-policy.yaml at main · datamasque/DataMasque-AWS-Cross-Account-Bucket-Access · GitHub

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AWSTemplateFormatVersion: "2010-09-09"
Description: The CFN stack to enable DataMasque to mask data on S3 buckets in same account.

Parameters:
  DmRoleName:
    Type: String
    Description: The name of the DataMasque instance IAM role to which the policy will be attached (role name, not ARN).

  DestinationBuckets:
    Type: CommaDelimitedList
    Description: Comma separated ARNs of target S3 buckets on which masked data is written.

  SourceBuckets:
    Type: CommaDelimitedList
    Description: Comma separated ARNs of source S3 buckets on which data needs to be masked.

  SourceBucketsPrefixes:
    Type: CommaDelimitedList
    Description: Comma separated prefixes of source S3 buckets from which data needs to be masked.

  DestinationBucketsPrefixes:
    Type: CommaDelimitedList
    Description: Comma separated prefixes of destination S3 buckets to which masked data is written.

  PolicyName:
    Type: String
    Default: datamasque-policy
    Description: The name of the managed policy.

  KmsKeyArns:
    Type: CommaDelimitedList
    Default: ""
    Description: >-
      Optional. ARNs of the SSE-KMS keys protecting the source/destination buckets, separated by commas.
      Leave empty when buckets use SSE-S3 (AES256). When set, the policy grants kms:Decrypt and
      kms:GenerateDataKey on those keys so masking can read/write KMS-encrypted objects.

Conditions:
  # True when at least one KMS key ARN was supplied (Default "" yields a single empty element).
  HasKmsKeys: !Not [!Equals [!Join ["", !Ref KmsKeyArns], ""]]

Resources:
  DmManagedPolicy:
    Type: "AWS::IAM::ManagedPolicy"
    Properties:
      ManagedPolicyName: !Ref PolicyName
      Description: "Policy to enable DataMasque to mask data on S3 buckets in same account"
      PolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Sid: ListBucketInfo
            Effect: Allow
            Action:
              - s3:ListBucket
              - s3:GetBucketAcl
              - s3:GetBucketPolicyStatus
              - s3:GetBucketPublicAccessBlock
              - s3:GetBucketObjectLockConfiguration
              - s3:GetEncryptionConfiguration
            Resource: !Split
              - ","
              - !Join
                - ","
                - - !Join [",", !Ref SourceBuckets]
                  - !Join [",", !Ref DestinationBuckets]
          - Sid: ReadBucket
            Effect: Allow
            Action:
              - s3:GetObject
            Resource: !Ref SourceBucketsPrefixes
          - Sid: ReadWriteDeleteAccess
            Effect: Allow
            Action:
              - s3:PutObject
              - s3:GetObject
              - s3:DeleteObject
            Resource: !Ref DestinationBucketsPrefixes
          # SSE-KMS support: only present when KmsKeyArns is provided.
          - !If
            - HasKmsKeys
            - Sid: KmsDataKeyAccess
              Effect: Allow
              Action:
                - kms:Decrypt
                - kms:GenerateDataKey
              Resource: !Ref KmsKeyArns
            - !Ref AWS::NoValue
      Roles:
        - !Ref DmRoleName

Outputs:
  DatamasqueS3Access:
    Description: "ARN of the managed policy created to enable DataMasque to mask data on S3 buckets."
    Value: !Ref DmManagedPolicy