########################################################################
# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: MIT-0
########################################################################
AWSTemplateFormatVersion: 2010-09-09
Description:
  This solution enables the EC2 default ebs encryption in each account and region. - 'ec2_default_ebs_encryption' solution in the repo,
  https://github.com/aws-samples/aws-security-reference-architecture-examples (sra-1ssgnse40)

Metadata:
  SRA:
    Version: 1.3
    Entry: Parameters for deploying solution
    Order: 1
  AWS::CloudFormation::Interface:
    ParameterGroups:
      - Label:
          default: General Properties
        Parameters:
          - pSRASolutionName
          - pSRASolutionVersion
          - pSRAStagingS3BucketName
          - pRootOrganizationalUnitId
          - pSRAAlarmEmail

      - Label:
          default: EC2 Default EBS Encryption Properties
        Parameters:
          - pOrganizationId
          - pExcludeEC2DefaultEBSEncryptionTags
          - pControlTowerRegionsOnly
          - pEnabledRegions

      - Label:
          default: General Lambda Function Properties
        Parameters:
          - pCreateLambdaLogGroup
          - pLambdaLogGroupRetention
          - pLambdaLogGroupKmsKey
          - pLambdaLogLevel

      - Label:
          default: EventBridge Rule Properties
        Parameters:
          - pComplianceFrequency

    ParameterLabels:
      pComplianceFrequency:
        default: Frequency to Check for Organizational Compliance
      pControlTowerRegionsOnly:
        default: Control Tower Regions Only
      pCreateLambdaLogGroup:
        default: Create Lambda Log Group
      pEnabledRegions:
        default: Enabled Regions
      pExcludeEC2DefaultEBSEncryptionTags:
        default: (Optional) Exclude EC2 Default EBS Encryption Tags
      pLambdaLogGroupKmsKey:
        default: (Optional) Lambda Log Group KMS Key
      pLambdaLogGroupRetention:
        default: Lambda Log Group Retention
      pLambdaLogLevel:
        default: Lambda Logging Level
      pOrganizationId:
        default: Organization ID
      pRootOrganizationalUnitId:
        default: Root Organizational Unit ID
      pSRAAlarmEmail:
        default: (Optional) SRA Alarm Email
      pSRASolutionName:
        default: SRA Solution Name
      pSRASolutionVersion:
        default: SRA Solution Version
      pSRAStagingS3BucketName:
        default: SRA Staging S3 Bucket Name

Parameters:
  pComplianceFrequency:
    ConstraintDescription: Compliance Frequency must be a number between 1 and 30, inclusive.
    Default: 7
    Description: Frequency (in days between 1 and 30, default is 7) to check organizational compliance
    MinValue: 1
    MaxValue: 30
    Type: Number
  pControlTowerRegionsOnly:
    Type: String
    Description: Only enable in the Control Tower governed regions
    Default: true
    AllowedValues: [true, false]
  pCreateLambdaLogGroup:
    AllowedValues: ['true', 'false']
    Default: 'false'
    Description:
      Indicates whether a CloudWatch Log Group should be explicitly created for the Lambda function, to allow for setting a Log Retention and/or KMS
      Key for encryption.
    Type: String
  pEnabledRegions:
    AllowedPattern: '^$|^([a-z0-9-]{1,64})$|^(([a-z0-9-]{1,64},)*[a-z0-9-]{1,64})$'
    ConstraintDescription:
      Only lowercase letters, numbers, and hyphens ('-') allowed. (e.g. us-east-1) Additional AWS regions can be provided, separated by commas. (e.g.
      us-east-1,ap-southeast-2)
    Default: ''
    Description:
      (Optional) If Control Tower Regions Only = false, list the regions to enable (AWS regions, separated by commas). Leave blank to enable all
      regions. Regions must be enabled in all accounts within the AWS Organization.
    Type: String
  pExcludeEC2DefaultEBSEncryptionTags:
    AllowedPattern: '^$|.*'
    Default: ''
    Description:
      '(Optional) Resource Tags that denote an Account should be excluded from this solution in JSON format: [{"Key": "string", "Value": "string"},
      ... ]. For example, [{"Key": "exclude-ec2-default-ebs-encryption", "Value": "true"}].'
    Type: String
  pLambdaLogGroupKmsKey:
    AllowedPattern: '^$|^arn:(aws[a-zA-Z-]*){1}:kms:[a-z0-9-]+:\d{12}:key\/[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$'
    ConstraintDescription: 'Key ARN example:  arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab'
    Default: ''
    Description:
      (Optional) KMS Key ARN to use for encrypting the Lambda logs data. If empty, encryption is enabled with CloudWatch Logs managing the server-side
      encryption keys.
    Type: String
  pLambdaLogGroupRetention:
    AllowedValues: [1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1827, 3653]
    Default: 14
    Description: Specifies the number of days you want to retain log events
    Type: String
  pLambdaLogLevel:
    AllowedValues: [DEBUG, INFO, ERROR]
    Default: INFO
    Description: Lambda Function Logging Level
    Type: String
  pOrganizationId:
    AllowedPattern: '^o-[a-z0-9]{10,32}$'
    ConstraintDescription: Must start with 'o-' followed by from 10 to 32 lowercase letters or digits. (e.g. o-abc1234567)
    Description: AWS Organizations ID
    Type: String
  pRootOrganizationalUnitId:
    AllowedPattern: '^r-[0-9a-z]{4,32}$'
    ConstraintDescription: Must start with 'r-' followed by from 4 to 32 lowercase letters or digits. (e.g. r-abc123)
    Description: Root Organizational Unit ID
    Type: String
  pSRAAlarmEmail:
    AllowedPattern: '^$|^([a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+)$'
    ConstraintDescription: Email Validation as per RFC2822 standards.
    Default: ''
    Description:
      (Optional) Email address for receiving DLQ alarms. If empty, CloudWatch Alarm will not be created to notify when the DLQ has a queue depth of 1.
    Type: String
  pSRASolutionName:
    AllowedValues: [sra-ec2-default-ebs-encryption]
    Default: sra-ec2-default-ebs-encryption
    Description: The SRA solution name. The default value is the folder name of the solution
    Type: String
  pSRASolutionVersion:
    AllowedValues: [v1.3]
    Default: v1.3
    Description: The SRA solution version. Used to trigger updates on the nested StackSets.
    Type: String
  pSRAStagingS3BucketName:
    AllowedPattern: '^([\w.-]{1,900})$|^(\/[\w.-]{1,900})*[\w.-]{1,900}$'
    ConstraintDescription:
      Must be alphanumeric or special characters [., _, -]. In addition, the slash character ( / ) used to delineate hierarchies in parameter names.
    Description:
      SRA Staging S3 bucket name for the artifacts relevant to solution. (e.g., lambda zips, CloudFormation templates) S3 bucket name can include
      numbers, lowercase letters, uppercase letters, and hyphens (-). It cannot start or end with a hyphen (-).
    Type: String

Rules:
  EnabledRegionValidation:
    RuleCondition: !Equals [!Ref pControlTowerRegionsOnly, 'true']
    Assertions:
      - Assert: !Equals [!Ref pEnabledRegions, '']
        AssertDescription: "'Control Tower Regions Only' parameter needs to be false, if 'Enabled Regions' are provided."

Conditions:
  cNotGlobalRegionUsEast1: !Not [!Equals [!Ref 'AWS::Region', us-east-1]]

Resources:
  rEC2DefaultEBSEncryptionRoleStackSet:
    Type: AWS::CloudFormation::StackSet
    Properties:
      StackSetName: sra-ec2-default-ebs-encryption-role
      AutoDeployment:
        Enabled: true
        RetainStacksOnAccountRemoval: false
      CallAs: SELF
      Capabilities:
        - CAPABILITY_NAMED_IAM
      Description: !Sub ${pSRASolutionVersion} - Deploys an IAM role via ${pSRASolutionName}
      ManagedExecution:
        Active: true
      OperationPreferences:
        FailureTolerancePercentage: 100
        MaxConcurrentPercentage: 100
        RegionConcurrencyType: PARALLEL
      PermissionModel: SERVICE_MANAGED
      StackInstancesGroup:
        - DeploymentTargets:
            OrganizationalUnitIds:
              - !Ref pRootOrganizationalUnitId
          Regions:
            - !Ref AWS::Region
      TemplateURL: !Sub https://${pSRAStagingS3BucketName}.s3.${AWS::Region}.${AWS::URLSuffix}/${pSRASolutionName}/templates/sra-ec2-default-ebs-encryption-role.yaml
      Parameters:
        - ParameterKey: pManagementAccountId
          ParameterValue: !Ref AWS::AccountId
      Tags:
        - Key: sra-solution
          Value: !Ref pSRASolutionName

  rEC2DefaultEBSEncryptionRoleStack:
    Type: AWS::CloudFormation::Stack
    DeletionPolicy: Delete
    DependsOn: rEC2DefaultEBSEncryptionRoleStackSet
    UpdateReplacePolicy: Delete
    Properties:
      TemplateURL: !Sub https://${pSRAStagingS3BucketName}.s3.${AWS::Region}.${AWS::URLSuffix}/${pSRASolutionName}/templates/sra-ec2-default-ebs-encryption-role.yaml
      Tags:
        - Key: sra-solution
          Value: !Ref pSRASolutionName
      Parameters:
        pManagementAccountId: !Ref AWS::AccountId

  rEC2DefaultEBSEncryptionStack:
    Type: AWS::CloudFormation::Stack
    DeletionPolicy: Delete
    DependsOn: rEC2DefaultEBSEncryptionRoleStack
    UpdateReplacePolicy: Delete
    Properties:
      TemplateURL: !Sub https://${pSRAStagingS3BucketName}.s3.${AWS::Region}.${AWS::URLSuffix}/${pSRASolutionName}/templates/sra-ec2-default-ebs-encryption.yaml
      Tags:
        - Key: sra-solution
          Value: !Ref pSRASolutionName
      Parameters:
        pComplianceFrequency: !Ref pComplianceFrequency
        pControlTowerRegionsOnly: !Ref pControlTowerRegionsOnly
        pCreateLambdaLogGroup: !Ref pCreateLambdaLogGroup
        pEnabledRegions: !Ref pEnabledRegions
        pExcludeEC2DefaultEBSEncryptionTags: !Ref pExcludeEC2DefaultEBSEncryptionTags
        pLambdaLogGroupKmsKey: !Ref pLambdaLogGroupKmsKey
        pLambdaLogGroupRetention: !Ref pLambdaLogGroupRetention
        pLambdaLogLevel: !Ref pLambdaLogLevel
        pManagementAccountId: !Ref AWS::AccountId
        pOrganizationId: !Ref pOrganizationId
        pSRAAlarmEmail: !Ref pSRAAlarmEmail
        pSRAStagingS3BucketName: !Ref pSRAStagingS3BucketName

  rEC2DefaultEBSEncryptionGlobalEventsStackSet:
    Type: AWS::CloudFormation::StackSet
    Condition: cNotGlobalRegionUsEast1
    DependsOn: rEC2DefaultEBSEncryptionStack
    Properties:
      StackSetName: sra-ec2-default-ebs-encryption-global-events
      AdministrationRoleARN: !Sub arn:${AWS::Partition}:iam::${AWS::AccountId}:role/service-role/AWSControlTowerStackSetRole
      CallAs: SELF
      Capabilities:
        - CAPABILITY_NAMED_IAM
      Description:
        !Sub ${pSRASolutionVersion} - Deploys EventBridge Rules via ${pSRASolutionName} for capturing global events forwarding to the home region.
      ExecutionRoleName: AWSControlTowerExecution
      ManagedExecution:
        Active: true
      OperationPreferences:
        FailureTolerancePercentage: 0
        MaxConcurrentPercentage: 100
        RegionConcurrencyType: PARALLEL
      PermissionModel: SELF_MANAGED
      StackInstancesGroup:
        - DeploymentTargets:
            Accounts:
              - !Ref AWS::AccountId
          Regions:
            - us-east-1
      TemplateURL: !Sub https://${pSRAStagingS3BucketName}.s3.${AWS::Region}.${AWS::URLSuffix}/${pSRASolutionName}/templates/sra-ec2-default-ebs-encryption-global-events.yaml
      Parameters:
        - ParameterKey: pHomeRegion
          ParameterValue: !Ref AWS::Region
      Tags:
        - Key: sra-solution
          Value: !Ref pSRASolutionName