EMR cluster without security configuration

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Metadata

Id: cloudformation-aws-emr-cluster-without-security-configuration

Provider: AWS

Platform: CloudFormation

Severity: Medium

Category: Insecure Configurations

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Description

EMR clusters must reference an EMR security configuration so cluster-level security settings (such as encryption and authentication controls) are applied. Without a security configuration, data at rest or in transit and access controls may not be enforced, increasing the risk of data exposure or unauthorized access.

In CloudFormation, the SecurityConfiguration property on AWS::EMR::Cluster must be defined and set to the logical name (string) of a resource of type AWS::EMR::SecurityConfiguration. Resources missing this property, or where the SecurityConfiguration value does not match an AWS::EMR::SecurityConfiguration resource in the same template, will be flagged.

Secure configuration example:

EMRSecurityConfig:
  Type: AWS::EMR::SecurityConfiguration
  Properties:
    Name: my-emr-security-config
    SecurityConfiguration: |
      {
        "EncryptionConfiguration": { "EnableAtRestEncryption": true }
      }

EMRCluster:
  Type: AWS::EMR::Cluster
  Properties:
    Name: my-emr-cluster
    ReleaseLabel: emr-6.3.0
    Instances: {}
    SecurityConfiguration: !Ref EMRSecurityConfig

Compliant Code Examples

AWSTemplateFormatVersion: 2010-09-09
Parameters:
  CrossRealmTrustPrincipalPassword:
    Type: String
  KdcAdminPassword:
    Type: String
  Realm:
    Type: String
  InstanceType:
    Type: String
  ReleaseLabel:
    Type: String
  SubnetId:
    Type: String
Resources:
  cluster:
    Type: 'AWS::EMR::Cluster'
    Properties:
      Instances:
        MasterInstanceGroup:
          InstanceCount: 1
          InstanceType: !Ref InstanceType
          Market: ON_DEMAND
          Name: cfnMaster
        CoreInstanceGroup:
          InstanceCount: 1
          InstanceType: !Ref InstanceType
          Market: ON_DEMAND
          Name: cfnCore
        Ec2SubnetId: !Ref SubnetId
      Name: CFNtest2
      JobFlowRole: !Ref emrEc2InstanceProfile
      KerberosAttributes:
        CrossRealmTrustPrincipalPassword: CfnIntegrationTest-1
        KdcAdminPassword: CfnIntegrationTest-1
        Realm: EC2.INTERNAL
      ServiceRole: !Ref emrRole
      ReleaseLabel: !Ref ReleaseLabel
      SecurityConfiguration: !Ref securityConfiguration
      VisibleToAllUsers: true
      Tags:
        - Key: key1
          Value: value1
  key:
    Type: 'AWS::KMS::Key'
    Properties:
      KeyPolicy:
        Version: 2012-10-17
        Id: key-default-1
        Statement:
          - Sid: Enable IAM User Permissions
            Effect: Allow
            Principal:
              AWS: !GetAtt
                - emrEc2Role
                - Arn
            Action: 'kms:*'
            Resource: '*'
          - Sid: Enable IAM User Permissions
            Effect: Allow
            Principal:
              AWS: !Join
                - ''
                - - 'arn:aws:iam::'
                  - !Ref 'AWS::AccountId'
                  - ':root'
            Action: 'kms:*'
            Resource: '*'
  securityConfiguration:
    Type: 'AWS::EMR::SecurityConfiguration'
    Properties:
      SecurityConfiguration:
        AuthenticationConfiguration:
          KerberosConfiguration:
            Provider: ClusterDedicatedKdc
            ClusterDedicatedKdcConfiguration:
              TicketLifetimeInHours: 24
              CrossRealmTrustConfiguration:
                Realm: AD.DOMAIN.COM
                Domain: ad.domain.com
                AdminServer: ad.domain.com
                KdcServer: ad.domain.com
  emrRole:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: 2008-10-17
        Statement:
          - Sid: ''
            Effect: Allow
            Principal:
              Service: elasticmapreduce.amazonaws.com
            Action: 'sts:AssumeRole'
      Path: /
      ManagedPolicyArns:
        - 'arn:aws:iam::aws:policy/service-role/AmazonElasticMapReduceRole'
  emrEc2Role:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: 2008-10-17
        Statement:
          - Sid: ''
            Effect: Allow
            Principal:
              Service: ec2.amazonaws.com
            Action: 'sts:AssumeRole'
      Path: /
      ManagedPolicyArns:
        - 'arn:aws:iam::aws:policy/service-role/AmazonElasticMapReduceforEC2Role'
  emrEc2InstanceProfile:
    Type: 'AWS::IAM::InstanceProfile'
    Properties:
      Path: /
      Roles:
        - !Ref emrEc2Role
Outputs:
  keyArn:
    Value: !GetAtt
      - key
      - Arn

AWSTemplateFormatVersion: 2010-09-09
Description: The cluster references its security configuration with a short-form Ref intrinsic
Resources:
  cluster:
    Type: 'AWS::EMR::Cluster'
    Properties:
      Instances:
        Ec2SubnetId: subnet-12345678
      Name: CFNtest
      JobFlowRole: EMR_EC2_DefaultRole
      ServiceRole: EMR_DefaultRole
      ReleaseLabel: emr-5.0.0
      SecurityConfiguration: !Ref securityConfiguration
      VisibleToAllUsers: true
  securityConfiguration:
    Type: 'AWS::EMR::SecurityConfiguration'
    Properties:
      SecurityConfiguration:
        AuthenticationConfiguration:
          KerberosConfiguration:
            Provider: ClusterDedicatedKdc

Non-Compliant Code Examples

AWSTemplateFormatVersion: 2010-09-09
Parameters:
  CrossRealmTrustPrincipalPassword:
    Type: String
  KdcAdminPassword:
    Type: String
  Realm:
    Type: String
  InstanceType:
    Type: String
  ReleaseLabel:
    Type: String
  SubnetId:
    Type: String
Resources:
  cluster:
    Type: 'AWS::EMR::Cluster'
    Properties:
      Instances:
        MasterInstanceGroup:
          InstanceCount: 1
          InstanceType: !Ref InstanceType
          Market: ON_DEMAND
          Name: cfnMaster
        CoreInstanceGroup:
          InstanceCount: 1
          InstanceType: !Ref InstanceType
          Market: ON_DEMAND
          Name: cfnCore
        Ec2SubnetId: !Ref SubnetId
      Name: CFNtest2
      JobFlowRole: !Ref emrEc2InstanceProfile
      KerberosAttributes:
        CrossRealmTrustPrincipalPassword: CfnIntegrationTest-1
        KdcAdminPassword: CfnIntegrationTest-1
        Realm: EC2.INTERNAL
      ServiceRole: !Ref emrRole
      ReleaseLabel: !Ref ReleaseLabel
      SecurityConfiguration: !Ref securityConfiguration1
      VisibleToAllUsers: true
      Tags:
        - Key: key1
          Value: value1
  key:
    Type: 'AWS::KMS::Key'
    Properties:
      KeyPolicy:
        Version: 2012-10-17
        Id: key-default-1
        Statement:
          - Sid: Enable IAM User Permissions
            Effect: Allow
            Principal:
              AWS: !GetAtt
                - emrEc2Role
                - Arn
            Action: 'kms:*'
            Resource: '*'
          - Sid: Enable IAM User Permissions
            Effect: Allow
            Principal:
              AWS: !Join
                - ''
                - - 'arn:aws:iam::'
                  - !Ref 'AWS::AccountId'
                  - ':root'
            Action: 'kms:*'
            Resource: '*'
  securityConfiguration:
    Type: 'AWS::EMR::SecurityConfiguration'
    Properties:
      SecurityConfiguration:
        AuthenticationConfiguration:
          KerberosConfiguration:
            Provider: ClusterDedicatedKdc
            ClusterDedicatedKdcConfiguration:
              TicketLifetimeInHours: 24
              CrossRealmTrustConfiguration:
                Realm: AD.DOMAIN.COM
                Domain: ad.domain.com
                AdminServer: ad.domain.com
                KdcServer: ad.domain.com
  emrRole:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: 2008-10-17
        Statement:
          - Sid: ''
            Effect: Allow
            Principal:
              Service: elasticmapreduce.amazonaws.com
            Action: 'sts:AssumeRole'
      Path: /
      ManagedPolicyArns:
        - 'arn:aws:iam::aws:policy/service-role/AmazonElasticMapReduceRole'
  emrEc2Role:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: 2008-10-17
        Statement:
          - Sid: ''
            Effect: Allow
            Principal:
              Service: ec2.amazonaws.com
            Action: 'sts:AssumeRole'
      Path: /
      ManagedPolicyArns:
        - 'arn:aws:iam::aws:policy/service-role/AmazonElasticMapReduceforEC2Role'
  emrEc2InstanceProfile:
    Type: 'AWS::IAM::InstanceProfile'
    Properties:
      Path: /
      Roles:
        - !Ref emrEc2Role
Outputs:
  keyArn:
    Value: !GetAtt
      - key
      - Arn

AWSTemplateFormatVersion: 2010-09-09
Parameters:
  CrossRealmTrustPrincipalPassword:
    Type: String
  KdcAdminPassword:
    Type: String
  Realm:
    Type: String
  InstanceType:
    Type: String
  ReleaseLabel:
    Type: String
  SubnetId:
    Type: String
Resources:
  cluster1:
    Type: 'AWS::EMR::Cluster'
    Properties:
      Instances:
        MasterInstanceGroup:
          InstanceCount: 1
          InstanceType: !Ref InstanceType
          Market: ON_DEMAND
          Name: cfnMaster
        CoreInstanceGroup:
          InstanceCount: 1
          InstanceType: !Ref InstanceType
          Market: ON_DEMAND
          Name: cfnCore
        Ec2SubnetId: !Ref SubnetId
      Name: CFNtest2
      JobFlowRole: !Ref emrEc2InstanceProfile
      KerberosAttributes:
        CrossRealmTrustPrincipalPassword: CfnIntegrationTest-1
        KdcAdminPassword: CfnIntegrationTest-1
        Realm: EC2.INTERNAL
      ServiceRole: !Ref emrRole
      ReleaseLabel: !Ref ReleaseLabel
      VisibleToAllUsers: true
      Tags:
        - Key: key1
          Value: value1
  key:
    Type: 'AWS::KMS::Key'
    Properties:
      KeyPolicy:
        Version: 2012-10-17
        Id: key-default-1
        Statement:
          - Sid: Enable IAM User Permissions
            Effect: Allow
            Principal:
              AWS: !GetAtt
                - emrEc2Role
                - Arn
            Action: 'kms:*'
            Resource: '*'
          - Sid: Enable IAM User Permissions
            Effect: Allow
            Principal:
              AWS: !Join
                - ''
                - - 'arn:aws:iam::'
                  - !Ref 'AWS::AccountId'
                  - ':root'
            Action: 'kms:*'
            Resource: '*'
  emrRole1:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: 2008-10-17
        Statement:
          - Sid: ''
            Effect: Allow
            Principal:
              Service: elasticmapreduce.amazonaws.com
            Action: 'sts:AssumeRole'
      Path: /
      ManagedPolicyArns:
        - 'arn:aws:iam::aws:policy/service-role/AmazonElasticMapReduceRole'
  emrEc2Role1:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: 2008-10-17
        Statement:
          - Sid: ''
            Effect: Allow
            Principal:
              Service: ec2.amazonaws.com
            Action: 'sts:AssumeRole'
      Path: /
      ManagedPolicyArns:
        - 'arn:aws:iam::aws:policy/service-role/AmazonElasticMapReduceforEC2Role'
  emrEc2InstanceProfile1:
    Type: 'AWS::IAM::InstanceProfile'
    Properties:
      Path: /
      Roles:
        - !Ref emrEc2Role
Outputs:
  keyArn:
    Value: !GetAtt
      - key
      - Arn