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# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: MIT-0
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AWSTemplateFormatVersion: 2010-09-09
Description:
  This template creates a custom resource Lambda and updates the account password policy. - 'iam_password_policy' solution in the repo,
  https://github.com/aws-samples/aws-security-reference-architecture-examples (sra-1ssgnse59)
Metadata:
  SRA:
    Version: 1.2
    Entry: Parameters for deploying solution
    Order: 1
  AWS::CloudFormation::Interface:
    ParameterGroups:
      - Label:
          default: General Properties
        Parameters:
          - pSRASolutionName
          - pSRASolutionVersion
          - pSRAStagingS3BucketName
          - pRootOrganizationalUnitId
      - Label:
          default: IAM Password Properties
        Parameters:
          - pAllowUsersToChangePassword
          - pHardExpiry
          - pMaxPasswordAge
          - pMinimumPasswordLength
          - pPasswordReusePrevention
          - pRequireLowercaseCharacters
          - pRequireNumbers
          - pRequireSymbols
          - pRequireUppercaseCharacters
      - Label:
          default: General Lambda Function Properties
        Parameters:
          - pCreateLambdaLogGroup
          - pLambdaLogGroupRetention
          - pLambdaLogGroupKmsKey
          - pLambdaLogLevel

    ParameterLabels:
      pAllowUsersToChangePassword:
        default: Allow Users to Change Password
      pCreateLambdaLogGroup:
        default: Create Lambda Log Group
      pHardExpiry:
        default: Hard Expiry
      pLambdaLogGroupKmsKey:
        default: (Optional) Lambda Logs KMS Key
      pLambdaLogGroupRetention:
        default: Lambda Log Group Retention
      pLambdaLogLevel:
        default: Lambda Log Level
      pMaxPasswordAge:
        default: Max Password Age
      pMinimumPasswordLength:
        default: Minimum Password Length
      pPasswordReusePrevention:
        default: Password Reuse Prevention
      pRequireLowercaseCharacters:
        default: Require Lowercase Characters
      pRequireNumbers:
        default: Require Numbers
      pRequireSymbols:
        default: Require Symbols
      pRequireUppercaseCharacters:
        default: Require Uppercase Characters
      pRootOrganizationalUnitId:
        default: Root Organizational Unit ID
      pSRASolutionName:
        default: SRA Solution Name
      pSRAStagingS3BucketName:
        default: SRA Staging S3 Bucket Name

Parameters:
  pAllowUsersToChangePassword:
    AllowedValues: ['true', 'false']
    Default: 'true'
    Description: You can permit all IAM users in your account to use the IAM console to change their own passwords.
    Type: String
  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
  pHardExpiry:
    AllowedValues: ['true', 'false']
    Default: 'false'
    Description: 'You can prevent IAM users from choosing a new password after their current password has expired.'
    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: [INFO, ERROR, DEBUG]
    Default: INFO
    Description: Lambda Function Logging Level
    Type: String
  pMaxPasswordAge:
    ConstraintDescription: Must be in the range [1-1095]
    Default: 90
    Description: You can set IAM user passwords to be valid for only the specified number of days.
    MaxValue: 1095
    MinValue: 1
    Type: Number
  pMinimumPasswordLength:
    ConstraintDescription: Must be in the range [6-128]
    Default: 14
    Description: You can specify the minimum number of characters allowed in an IAM user password.
    MaxValue: 128
    MinValue: 6
    Type: Number
  pPasswordReusePrevention:
    ConstraintDescription: Must be in the range [1-24]
    Default: 24
    Description: You can prevent IAM users from reusing a specified number of previous passwords.
    MaxValue: 24
    MinValue: 1
    Type: Number
  pRequireLowercaseCharacters:
    AllowedValues: ['true', 'false']
    Default: 'true'
    Description: You can require that IAM user passwords contain at least one lowercase character from the ISO basic Latin alphabet (a to z).
    Type: String
  pRequireNumbers:
    AllowedValues: ['true', 'false']
    Default: 'true'
    Description: You can require that IAM user passwords contain at least one numeric character (0 to 9).
    Type: String
  pRequireSymbols:
    AllowedValues: ['true', 'false']
    Default: 'true'
    Description:
      "You can require that IAM user passwords contain at least one of the following nonalphanumeric characters: ! @ # $ % ^ & * ( ) _ + - = [ ] {} |
      '"
    Type: String
  pRequireUppercaseCharacters:
    AllowedValues: ['true', 'false']
    Default: 'true'
    Description: You can require that IAM user passwords contain at least one uppercase character from the ISO basic Latin alphabet (A to Z).
    Type: String
  pRootOrganizationalUnitId:
    AllowedPattern: '^r-[0-9a-z]{4,32}$'
    ConstraintDescription: Must start with 'r-' followed by from 4 to 32 lowercase letters or digits. (e.g. r-abc123)
    Description: Root Organizational Unit ID
    Type: String
  pSRASolutionName:
    AllowedValues: [sra-iam-password-policy]
    Default: sra-iam-password-policy
    Description: The SRA solution name. The default value is the folder name of the solution
    Type: String
  pSRASolutionVersion:
    AllowedValues: [v1.2]
    Default: v1.2
    Description: The SRA solution version. Used to trigger updates on the nested StackSets.
    Type: String
  pSRAStagingS3BucketName:
    AllowedPattern: '^(?=^.{3,63}$)(?!.*[.-]{2})(?!.*[--]{2})(?!^(?:(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])(\.(?!$)|$)){4}$)(^(([a-z0-9]|[a-z0-9][a-z0-9\-]*[a-z0-9])\.)*([a-z0-9]|[a-z0-9][a-z0-9\-]*[a-z0-9])$)'
    ConstraintDescription:
      SRA Staging S3 bucket name can include numbers, lowercase letters, uppercase letters, and hyphens (-). It cannot start or end with a hyphen (-).
    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

Resources:
  rIAMPasswordPolicyStack:
    Type: AWS::CloudFormation::Stack
    DeletionPolicy: Delete
    UpdateReplacePolicy: Delete
    Properties:
      TemplateURL: !Sub https://${pSRAStagingS3BucketName}.s3.${AWS::Region}.${AWS::URLSuffix}/${pSRASolutionName}/templates/sra-iam-password-policy.yaml
      Tags:
        - Key: sra-solution
          Value: !Ref pSRASolutionName
      Parameters:
        pAllowUsersToChangePassword: !Ref pAllowUsersToChangePassword
        pCreateLambdaLogGroup: !Ref pCreateLambdaLogGroup
        pHardExpiry: !Ref pHardExpiry
        pLambdaLogGroupKmsKey: !Ref pLambdaLogGroupKmsKey
        pLambdaLogGroupRetention: !Ref pLambdaLogGroupRetention
        pLambdaLogLevel: !Ref pLambdaLogLevel
        pMaxPasswordAge: !Ref pMaxPasswordAge
        pMinimumPasswordLength: !Ref pMinimumPasswordLength
        pPasswordReusePrevention: !Ref pPasswordReusePrevention
        pRequireLowercaseCharacters: !Ref pRequireLowercaseCharacters
        pRequireNumbers: !Ref pRequireNumbers
        pRequireSymbols: !Ref pRequireSymbols
        pRequireUppercaseCharacters: !Ref pRequireUppercaseCharacters
        pSRAStagingS3BucketName: !Ref pSRAStagingS3BucketName

  rIAMPasswordPolicyStackSet:
    Type: AWS::CloudFormation::StackSet
    Properties:
      StackSetName: sra-iam-password-policy
      AutoDeployment:
        Enabled: true
        RetainStacksOnAccountRemoval: false
      CallAs: SELF
      Capabilities:
        - CAPABILITY_NAMED_IAM
      Description: !Sub ${pSRASolutionVersion} - Deploys a custom resource Lambda via ${pSRASolutionName} for updating the IAM password policy
      ManagedExecution:
        Active: true
      OperationPreferences:
        FailureTolerancePercentage: 100
        MaxConcurrentPercentage: 100
        RegionConcurrencyType: PARALLEL
      PermissionModel: SERVICE_MANAGED
      StackInstancesGroup:
        - DeploymentTargets:
            OrganizationalUnitIds:
              - !Ref pRootOrganizationalUnitId
          Regions:
            - !Ref AWS::Region
      TemplateURL: !Sub https://${pSRAStagingS3BucketName}.s3.${AWS::Region}.${AWS::URLSuffix}/${pSRASolutionName}/templates/sra-iam-password-policy.yaml
      Parameters:
        - ParameterKey: pAllowUsersToChangePassword
          ParameterValue: !Ref pAllowUsersToChangePassword
        - ParameterKey: pCreateLambdaLogGroup
          ParameterValue: !Ref pCreateLambdaLogGroup
        - ParameterKey: pHardExpiry
          ParameterValue: !Ref pHardExpiry
        - ParameterKey: pLambdaLogGroupKmsKey
          ParameterValue: !Ref pLambdaLogGroupKmsKey
        - ParameterKey: pLambdaLogGroupRetention
          ParameterValue: !Ref pLambdaLogGroupRetention
        - ParameterKey: pLambdaLogLevel
          ParameterValue: !Ref pLambdaLogLevel
        - ParameterKey: pMaxPasswordAge
          ParameterValue: !Ref pMaxPasswordAge
        - ParameterKey: pMinimumPasswordLength
          ParameterValue: !Ref pMinimumPasswordLength
        - ParameterKey: pPasswordReusePrevention
          ParameterValue: !Ref pPasswordReusePrevention
        - ParameterKey: pRequireLowercaseCharacters
          ParameterValue: !Ref pRequireLowercaseCharacters
        - ParameterKey: pRequireNumbers
          ParameterValue: !Ref pRequireNumbers
        - ParameterKey: pRequireSymbols
          ParameterValue: !Ref pRequireSymbols
        - ParameterKey: pRequireUppercaseCharacters
          ParameterValue: !Ref pRequireUppercaseCharacters
        - ParameterKey: pSRAStagingS3BucketName
          ParameterValue: !Ref pSRAStagingS3BucketName
      Tags:
        - Key: sra-solution
          Value: !Ref pSRASolutionName