AWSTemplateFormatVersion: 2010-09-09
Description: LinuxBastion+VPC Nov,19,2019 QS(0037) (Please do not remove)
Metadata:
  LICENSE: Apache License, Version 2.0
  'AWS::CloudFormation::Interface':
    ParameterGroups:
      - Label:
          default: Network configuration
        Parameters:
          - VPCID
          - PublicSubnet1ID
          - PublicSubnet2ID
          - RemoteAccessCIDR
      - Label:
          default: Amazon EC2 configuration
        Parameters:
          - KeyPairName
          - BastionAMIOS
          - BastionInstanceType
          - RootVolumeSize
      - Label:
          default: Linux bastion configuration
        Parameters:
          - NumBastionHosts
          - BastionHostName
          - BastionTenancy
          - EnableBanner
          - BastionBanner
          - EnableTCPForwarding
          - EnableX11Forwarding
      - Label:
          default: Alternative configurations
        Parameters:
          - AlternativeInitializationScript
          - OSImageOverride
          - AlternativeIAMRole
          - EnvironmentVariables
      - Label:
          default: AWS Quick Start configuration
        Parameters:
          - QSS3BucketName
          - QSS3KeyPrefix
          - QSS3BucketRegion
    ParameterLabels:
      AlternativeIAMRole:
        default: Alternative IAM role
      AlternativeInitializationScript:
        default: Alternative initialization script
      BastionAMIOS:
        default: Bastion AMI operating system
      BastionHostName:
        default: Bastion Host Name
      BastionTenancy:
        default: Bastion tenancy
      BastionBanner:
        default: Banner text
      QSS3BucketRegion:
        default: Quick Start S3 bucket region
      BastionInstanceType:
        default: Bastion instance type
      EnableBanner:
        default: Bastion banner
      EnableTCPForwarding:
        default: TCP forwarding
      EnableX11Forwarding:
        default: X11 forwarding
      EnvironmentVariables:
        default: Environment variables
      KeyPairName:
        default: Key pair name
      NumBastionHosts:
        default: Number of bastion hosts
      OSImageOverride:
        default: Operating system override
      PublicSubnet1ID:
        default: Public subnet 1 ID
      PublicSubnet2ID:
        default: Public subnet 2 ID
      QSS3BucketName:
        default: Quick Start S3 bucket name
      QSS3KeyPrefix:
        default: Quick Start S3 key prefix
      RemoteAccessCIDR:
        default: Allowed bastion external access CIDR
      VPCID:
        default: VPC ID
      RootVolumeSize:
        default: Root volume size
  cfn-lint: { config: { ignore_checks: [E9007] } }
Parameters:
  BastionAMIOS:
    AllowedValues:
      - Amazon-Linux2-HVM
      - Amazon-Linux-HVM
      - CentOS-7-HVM
      - Ubuntu-Server-18.04-LTS-HVM
      - Ubuntu-Server-16.04-LTS-HVM
      - SUSE-SLES-15-HVM
    Default: Amazon-Linux2-HVM
    Description: The Linux distribution for the AMI to be used for the bastion instances.
    Type: String
  BastionHostName:
    Default: 'LinuxBastion'
    Description: The value used for the name tag of the bastion host
    Type: String
  BastionBanner:
    Default: ""
    Description: Banner text to display upon login.
    Type: String
  BastionTenancy:
    Description: 'VPC tenancy to launch the bastion in. Options: ''dedicated'' or ''default'''
    Type: String
    Default: default
    AllowedValues:
      - dedicated
      - default
  BastionInstanceType:
    AllowedValues:
      - t2.nano
      - t2.micro
      - t2.small
      - t2.medium
      - t2.large
      - t3.micro
      - t3.small
      - t3.medium
      - t3.large
      - t3.xlarge
      - t3.2xlarge
      - m4.large
      - m4.xlarge
      - m4.2xlarge
      - m4.4xlarge
    Default: t2.micro
    Description: Amazon EC2 instance type for the bastion instances.
    Type: String
  EnableBanner:
    AllowedValues:
      - 'true'
      - 'false'
    Default: 'false'
    Description: To include a banner to be displayed when connecting via SSH to the
      bastion, choose true.
    Type: String
  EnableTCPForwarding:
    Type: String
    Description: To enable TCP forwarding, choose true.
    Default: 'false'
    AllowedValues:
      - 'true'
      - 'false'
  EnableX11Forwarding:
    Type: String
    Description: To enable X11 forwarding, choose true.
    Default: 'false'
    AllowedValues:
      - 'true'
      - 'false'
  KeyPairName:
    Description: Name of an existing public/private key pair. If you do not have one in this AWS Region,
      please create it before continuing.
    Type: 'AWS::EC2::KeyPair::KeyName'
  NumBastionHosts:
    AllowedValues:
      - '1'
      - '2'
      - '3'
      - '4'
    Default: '1'
    Description: The number of bastion hosts to create. The maximum number is four.
    Type: String
  PublicSubnet1ID:
    Description: ID of the public subnet 1 that you want to provision the first bastion
      into (e.g., subnet-a0246dcd).
    Type: 'AWS::EC2::Subnet::Id'
  PublicSubnet2ID:
    Description: ID of the public subnet 2 that you want to provision the second bastion into
      (e.g., subnet-e3246d8e).
    Type: 'AWS::EC2::Subnet::Id'
  QSS3BucketName:
    AllowedPattern: '^[0-9a-zA-Z]+([0-9a-zA-Z-]*[0-9a-zA-Z])*$'
    ConstraintDescription: Quick Start bucket name can include numbers, lowercase letters, uppercase
      letters, and hyphens (-). It cannot start or end with a hyphen (-).
    Default: aws-quickstart
    Description: S3 bucket name for the Quick Start assets. Quick Start bucket name can
      include numbers, lowercase letters, uppercase letters, and hyphens (-). It
      cannot start or end with a hyphen (-).
    Type: String
  QSS3BucketRegion:
    Default: 'us-east-1'
    Description: The AWS Region where the Quick Start S3 bucket (QSS3BucketName) is hosted. When using your own bucket, you must specify this value.
    Type: String
  QSS3KeyPrefix:
    AllowedPattern: '^([0-9a-zA-Z-.]+/)*$'
    ConstraintDescription: Quick Start key prefix can include numbers, lowercase letters, uppercase
      letters, hyphens (-), dots (.) and forward slash (/). The prefix should
      end with a forward slash (/).
    Default: quickstart-linux-bastion/
    Description: S3 key prefix for the Quick Start assets. Quick Start key prefix can
      include numbers, lowercase letters, uppercase letters, hyphens (-), dots
      (.) and forward slash (/) and it should end with a forward slash (/).
    Type: String
  RemoteAccessCIDR:
    AllowedPattern: ^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(\/([0-9]|[1-2][0-9]|3[0-2]))$
    ConstraintDescription: CIDR block parameter must be in the form x.x.x.x/x
    Description: Allowed CIDR block for external SSH access to the bastions.
    Type: String
  VPCID:
    Description: 'ID of the VPC (e.g., vpc-0343606e).'
    Type: 'AWS::EC2::VPC::Id'
  AlternativeInitializationScript:
    AllowedPattern: ^http.*|^$
    ConstraintDescription: URL must begin with http
    Description: An alternative initialization script to run during setup.
    Default: ''
    Type: String
  OSImageOverride:
    Description: The Region-specific image to use for the instance.
    Type: String
    Default: ''
  AlternativeIAMRole:
    Description: An existing IAM Role name to attach to the bastion. If left blank,
      a new role will be created.
    Default: ''
    Type: String
  EnvironmentVariables:
    Description: A comma-separated list of environment variables for use in
      bootstrapping. Variables must be in the format KEY=VALUE. VALUE cannot
      contain commas.
    Type: String
    Default: ''
  RootVolumeSize:
    Description: The size in GB for the root EBS volume.
    Type: Number
    Default: '10'
Rules:
  SubnetsInVPC:
    Assertions:
      - Assert:
          'Fn::EachMemberIn':
            - 'Fn::ValueOfAll':
                - 'AWS::EC2::Subnet::Id'
                - VpcId
            - 'Fn::RefAll': 'AWS::EC2::VPC::Id'
        AssertDescription: All subnets must exist in the VPC
Mappings:
  AWSAMIRegionMap:
    ap-northeast-1:
      AMZNLINUX2: ami-0f310fced6141e627
      AMZNLINUXHVM: ami-0318ecd6d05daa212
      CENTOS7HVM: ami-06a46da680048c8ae
      US1604HVM: ami-0196a6e6d6129f2c8
      US1804HVM: ami-0278fe6949f6b1a06
      SLES15HVM: ami-056ac8ad44e6a7e1f
    ap-northeast-2:
      AMZNLINUX2: ami-01288945bd24ed49a
      AMZNLINUXHVM: ami-09391a0ad9f9243b6
      CENTOS7HVM: ami-06e83aceba2cb0907
      US1604HVM: ami-04e5ceec6723d7ec5
      US1804HVM: ami-00edfb46b107f643c
      SLES15HVM: ami-0f81fff879bafe6b8
    ap-south-1:
      AMZNLINUX2: ami-0470e33cd681b2476
      AMZNLINUXHVM: ami-04b2519c83e2a7ea5
      CENTOS7HVM: ami-026f33d38b6410e30
      US1604HVM: ami-01b8d0884f38e37b4
      US1804HVM: ami-0b44050b2d893d5f7
      SLES15HVM: ami-01be89269d32f2a16
    ap-southeast-1:
      AMZNLINUX2: ami-0ec225b5e01ccb706
      AMZNLINUXHVM: ami-0dff4318d85149d5d
      CENTOS7HVM: ami-07f65177cb990d65b
      US1604HVM: ami-01c54eee4ab8725c0
      US1804HVM: ami-0f7719e8b7ba25c61
      SLES15HVM: ami-070356c21596ddc67
    ap-southeast-2:
      AMZNLINUX2: ami-0970010f37c4f9c8d
      AMZNLINUXHVM: ami-050e1ec030abb8dde
      CENTOS7HVM: ami-0b2045146eb00b617
      US1604HVM: ami-07e22925f7bf77a0c
      US1804HVM: ami-04fcc97b5f6edcd89
      SLES15HVM: ami-0c4245381c67efb39
    ca-central-1:
      AMZNLINUX2: ami-054362537f5132ce2
      AMZNLINUXHVM: ami-021321e9bc16d5186
      CENTOS7HVM: ami-04a25c39dc7a8aebb
      US1604HVM: ami-03785c71db4b1f73a
      US1804HVM: ami-0edd51cc29813e254
      SLES15HVM: ami-0c97d9b588207dad6
    eu-central-1:
      AMZNLINUX2: ami-076431be05aaf8080
      AMZNLINUXHVM: ami-03ab4e8f1d88ce614
      CENTOS7HVM: ami-0e8286b71b81c3cc1
      US1604HVM: ami-0bad2b43a871348da
      US1804HVM: ami-0e342d72b12109f91
      SLES15HVM: ami-05dfd265ea534a3e9
    me-south-1:
      AMZNLINUX2: ami-0fde637e0db57a2ab
      AMZNLINUXHVM: ami-02a841b5a224a1caf
      CENTOS7HVM: ami-011c71a894b10f35b
      US1604HVM: ami-0fc34e7761742a76d
      US1804HVM: ami-051274f257aba97f9
      SLES15HVM: ami-0252c6d3a59c7473b
    ap-east-1:
      AMZNLINUX2: ami-dd7731ac
      AMZNLINUXHVM: ami-c86e28b9
      CENTOS7HVM: ami-0e5c29e6c87a9644f
      US1604HVM: ami-5493d525
      US1804HVM: ami-c790d6b6
      SLES15HVM: ami-0ad6e15bcbb2dbe38
    eu-north-1:
      AMZNLINUX2: ami-0b7a46b4bd694e8a6
      AMZNLINUXHVM: ami-0c5254b956817b326
      CENTOS7HVM: ami-05788af9005ef9a93
      US1604HVM: ami-0caae0b310f01ff33
      US1804HVM: ami-050981837962d44ac
      SLES15HVM: ami-0741fa1a008af40ad
    eu-west-1:
      AMZNLINUX2: ami-06ce3edf0cff21f07
      AMZNLINUXHVM: ami-00890f614e48ce866
      CENTOS7HVM: ami-0b850cf02cc00fdc8
      US1604HVM: ami-0f2ed58082cb08a4d
      US1804HVM: ami-0701e7be9b2a77600
      SLES15HVM: ami-0a58a1b152ba55f1d
    eu-west-2:
      AMZNLINUX2: ami-01a6e31ac994bbc09
      AMZNLINUXHVM: ami-0596aab74a1ce3983
      CENTOS7HVM: ami-09e5afc68eed60ef4
      US1604HVM: ami-0b1912235a9e70540
      US1804HVM: ami-0eb89db7593b5d434
      SLES15HVM: ami-01497522185aaa4ee
    eu-west-3:
      AMZNLINUX2: ami-00077e3fed5089981
      AMZNLINUXHVM: ami-06cba15121418cdcb
      CENTOS7HVM: ami-0cb72d2e599cffbf9
      US1604HVM: ami-0b92a0ac418c64fb1
      US1804HVM: ami-08c757228751c5335
      SLES15HVM: ami-0f238bd4c6fdbefb0
    sa-east-1:
      AMZNLINUX2: ami-003449ffb2605a74c
      AMZNLINUXHVM: ami-03e1e4abf50e14ded
      CENTOS7HVM: ami-0b30f38d939dd4b54
      US1604HVM: ami-0bb677666cd3fd188
      US1804HVM: ami-077d5d3682940b34a
      SLES15HVM: ami-0772af912976aa692
    us-east-1:
      AMZNLINUX2: ami-0323c3dd2da7fb37d
      AMZNLINUXHVM: ami-0915e09cc7ceee3ab
      CENTOS7HVM: ami-0affd4508a5d2481b
      US1604HVM: ami-039a49e70ea773ffc
      US1804HVM: ami-085925f297f89fce1
      SLES15HVM: ami-0b1764f3d7d2e2316
    us-gov-west-1:
      AMZNLINUXHVM: ami-f5e4d294
      AMZNLINUX2: ami-74c4f215
      US1804HVM: ami-adecdbcc
      US1604HVM: ami-3a61505b
      SLES15HVM: ami-57c0ba36
    us-gov-east-1:
      AMZNLINUXHVM: ami-51ef0320
      AMZNLINUX2: ami-30e00c41
      US1804HVM: ami-c29975b3
      US1604HVM: ami-7df4180c
      SLES15HVM: ami-05e4bedfad53425e9
    us-east-2:
      AMZNLINUX2: ami-0f7919c33c90f5b58
      AMZNLINUXHVM: ami-097834fcb3081f51a
      CENTOS7HVM: ami-01e36b7901e884a10
      US1604HVM: ami-03ffa9b61e8d2cfda
      US1804HVM: ami-07c1207a9d40bc3bd
      SLES15HVM: ami-05ea824317ffc0c20
    us-west-1:
      AMZNLINUX2: ami-06fcc1f0bc2c8943f
      AMZNLINUXHVM: ami-0027eed75be6f3bf4
      CENTOS7HVM: ami-098f55b4287a885ba
      US1604HVM: ami-00e3060e4cb84a493
      US1804HVM: ami-0f56279347d2fa43e
      SLES15HVM: ami-00e34a7624e5a7107
    us-west-2:
      AMZNLINUX2: ami-0d6621c01e8c2de2c
      AMZNLINUXHVM: ami-01f08ef3e76b957e5
      CENTOS7HVM: ami-0bc06212a56393ee1
      US1604HVM: ami-008c6427c8facbe08
      US1804HVM: ami-003634241a8fcdec0
      SLES15HVM: ami-0f1e3b3fb0fec0361
    cn-north-1:
      AMZNLINUX2: ami-010e92a33d9d1fc40
      AMZNLINUXHVM: ami-04b1196830276cd1f
      CENTOS7HVM: ami-0e02aaefeb74c3373
      US1604HVM: ami-04efbaf491dc3e681
      US1804HVM: ami-0071f6f4df15863cc
      SLES15HVM: ami-021392849b6221a81
    cn-northwest-1:
      AMZNLINUX2: ami-0959f8e18a2aac0fb
      AMZNLINUXHVM: ami-0bae393f70322bed6
      CENTOS7HVM: ami-07183a7702633260b
      US1604HVM: ami-032ddff247c0bae9e
      US1804HVM: ami-0a22b8776bb32836b
      SLES15HVM: ami-00e1de3ee6d0d28ea
  LinuxAMINameMap:
    Amazon-Linux2-HVM:
      Code: AMZNLINUX2
    Amazon-Linux-HVM:
      Code: AMZNLINUXHVM
    CentOS-7-HVM:
      Code: CENTOS7HVM
    Ubuntu-Server-18.04-LTS-HVM:
      Code: US1804HVM
    Ubuntu-Server-16.04-LTS-HVM:
      Code: US1604HVM
    SUSE-SLES-15-HVM:
      Code: SLES15HVM
Conditions:
  2BastionCondition: !Or
    - !Equals
      - !Ref NumBastionHosts
      - '2'
    - !Condition 3BastionCondition
    - !Condition 4BastionCondition
  3BastionCondition: !Or
    - !Equals
      - !Ref NumBastionHosts
      - '3'
    - !Condition 4BastionCondition
  4BastionCondition: !Equals
    - !Ref NumBastionHosts
    - '4'
  UseAlternativeInitialization: !Not
    - !Equals
      - !Ref AlternativeInitializationScript
      - ''
  CreateIAMRole: !Equals
    - !Ref AlternativeIAMRole
    - ''
  UseOSImageOverride: !Not
    - !Equals
      - !Ref OSImageOverride
      - ''
  UsingDefaultBucket: !Equals
    - !Ref QSS3BucketName
    - 'aws-quickstart'
  DefaultBanner: !Equals [!Ref BastionBanner, ""]
Resources:
  BastionMainLogGroup:
    Type: 'AWS::Logs::LogGroup'
  SSHMetricFilter:
    Type: 'AWS::Logs::MetricFilter'
    Properties:
      LogGroupName: !Ref BastionMainLogGroup
      FilterPattern: ON FROM USER PWD
      MetricTransformations:
        - MetricName: SSHCommandCount
          MetricValue: '1'
          MetricNamespace: !Sub "AWSQuickStart/${AWS::StackName}"
  BastionHostRole:
    Condition: CreateIAMRole
    Type: 'AWS::IAM::Role'
    Properties:
      Path: /
      AssumeRolePolicyDocument:
        Statement:
          - Action:
              - 'sts:AssumeRole'
            Principal:
              Service:
                - !Sub 'ec2.${AWS::URLSuffix}'
            Effect: Allow
        Version: 2012-10-17
      ManagedPolicyArns:
        - !Sub 'arn:${AWS::Partition}:iam::aws:policy/AmazonSSMManagedInstanceCore'
        - !Sub 'arn:${AWS::Partition}:iam::aws:policy/CloudWatchAgentServerPolicy'
  BastionHostPolicy:
    Type: 'AWS::IAM::Policy'
    Properties:
      PolicyName: BastionPolicy
      PolicyDocument:
        Version: 2012-10-17
        Statement:
          - Action:
              - 's3:GetObject'
            Resource: !Sub
              - arn:${AWS::Partition}:s3:::${S3Bucket}/${QSS3KeyPrefix}*
              - S3Bucket: !If [UsingDefaultBucket, !Sub '${QSS3BucketName}-${AWS::Region}', !Ref QSS3BucketName]
            Effect: Allow
          - Action:
              - 'logs:CreateLogStream'
              - 'logs:GetLogEvents'
              - 'logs:PutLogEvents'
              - 'logs:DescribeLogGroups'
              - 'logs:DescribeLogStreams'
              - 'logs:PutRetentionPolicy'
              - 'logs:PutMetricFilter'
              - 'logs:CreateLogGroup'
            Resource: !Sub "arn:${AWS::Partition}:logs:${AWS::Region}:${AWS::AccountId}:log-group:${BastionMainLogGroup}:*"
            Effect: Allow
          - Action:
              - 'ec2:AssociateAddress'
              - 'ec2:DescribeAddresses'
            Resource: '*'
            Effect: Allow
      Roles:
        - !If
          - CreateIAMRole
          - !Ref BastionHostRole
          - !Ref AlternativeIAMRole
  BastionHostProfile:
    DependsOn: BastionHostPolicy
    Type: 'AWS::IAM::InstanceProfile'
    Properties:
      Roles:
        - !If
          - CreateIAMRole
          - !Ref BastionHostRole
          - !Ref AlternativeIAMRole
      Path: /
  EIP1:
    Type: 'AWS::EC2::EIP'
    Properties:
      Domain: vpc
  EIP2:
    Type: 'AWS::EC2::EIP'
    Condition: 2BastionCondition
    Properties:
      Domain: vpc
  EIP3:
    Type: 'AWS::EC2::EIP'
    Condition: 3BastionCondition
    Properties:
      Domain: vpc
  EIP4:
    Type: 'AWS::EC2::EIP'
    Condition: 4BastionCondition
    Properties:
      Domain: vpc
  BastionAutoScalingGroup:
    Type: 'AWS::AutoScaling::AutoScalingGroup'
    Properties:
      LaunchConfigurationName: !Ref BastionLaunchConfiguration
      VPCZoneIdentifier:
        - !Ref PublicSubnet1ID
        - !Ref PublicSubnet2ID
      MinSize: !Ref NumBastionHosts
      MaxSize: !Ref NumBastionHosts
      Cooldown: '900'
      DesiredCapacity: !Ref NumBastionHosts
      Tags:
        - Key: Name
          Value: !Ref BastionHostName
          PropagateAtLaunch: true
    CreationPolicy:
      ResourceSignal:
        Count: !Ref NumBastionHosts
        Timeout: PT60M
      AutoScalingCreationPolicy:
        MinSuccessfulInstancesPercent: 100
    UpdatePolicy:
      AutoScalingReplacingUpdate:
        WillReplace: true
  BastionLaunchConfiguration:
    Type: 'AWS::AutoScaling::LaunchConfiguration'
    Metadata:
      'AWS::CloudFormation::Authentication':
        S3AccessCreds:
          type: S3
          roleName: !If
            - CreateIAMRole
            - !Ref BastionHostRole
            - !Ref AlternativeIAMRole
          buckets:
            - !If [UsingDefaultBucket, !Sub '${QSS3BucketName}-${AWS::Region}', !Ref QSS3BucketName]
      'AWS::CloudFormation::Init':
        config:
          files:
            /tmp/bastion_bootstrap.sh:
              source: !If
                - UseAlternativeInitialization
                - !Ref AlternativeInitializationScript
                - !Sub
                  - https://${S3Bucket}.s3.${S3Region}.${AWS::URLSuffix}/${QSS3KeyPrefix}scripts/bastion_bootstrap.sh
                  - S3Bucket: !If
                      - UsingDefaultBucket
                      - !Sub 'aws-quickstart-${AWS::Region}'
                      - !Ref 'QSS3BucketName'
                    S3Region: !If
                      - UsingDefaultBucket
                      - !Ref 'AWS::Region'
                      - !Ref 'QSS3BucketRegion'
              mode: '000550'
              owner: root
              group: root
              authentication: S3AccessCreds
          commands:
            b-bootstrap:
              cwd: '/tmp/'
              command: !Sub
                - "REGION=${AWS::Region} URL_SUFFIX=${AWS::URLSuffix} BANNER_REGION=${BannerRegion} ./bastion_bootstrap.sh --banner ${BannerUrl} --enable ${EnableBanner} --tcp-forwarding ${EnableTCPForwarding} --x11-forwarding ${EnableX11Forwarding}"
                - BannerRegion: !If [ UsingDefaultBucket, !Ref 'AWS::Region', !Ref 'QSS3BucketRegion' ]
                  BannerUrl: !If
                    - DefaultBanner
                    - !Sub
                      - s3://${S3Bucket}/${QSS3KeyPrefix}scripts/banner_message.txt
                      - S3Bucket: !If [ UsingDefaultBucket, !Sub 'aws-quickstart-${AWS::Region}', !Ref 'QSS3BucketName' ]
                    - !Ref BastionBanner
    Properties:
      AssociatePublicIpAddress: true
      PlacementTenancy: !Ref BastionTenancy
      KeyName: !Ref KeyPairName
      IamInstanceProfile: !Ref BastionHostProfile
      ImageId: !If
        - UseOSImageOverride
        - !Ref OSImageOverride
        - !FindInMap
          - AWSAMIRegionMap
          - !Ref 'AWS::Region'
          - !FindInMap
            - LinuxAMINameMap
            - !Ref BastionAMIOS
            - Code
      SecurityGroups:
        - !Ref BastionSecurityGroup
      InstanceType: !Ref BastionInstanceType
      BlockDeviceMappings:
        - DeviceName: /dev/xvda
          Ebs:
            VolumeSize: !Ref RootVolumeSize
            VolumeType: gp2
            Encrypted: true
            DeleteOnTermination: true
      UserData:
        Fn::Base64: !Sub
          - |
            #!/bin/bash
            set -x
            for e in $(echo "${EnvironmentVariables}" | tr ',' ' '); do
              export $e
            done
            export PATH=$PATH:/usr/local/bin
            #cfn signaling functions
            yum install git -y || apt-get install -y git || zypper -n install git

            function cfn_fail
            {
              cfn-signal -e 1 --stack ${AWS::StackName} --region ${AWS::Region} --resource BastionAutoScalingGroup
              exit 1
            }

            function cfn_success
            {
              cfn-signal -e 0 --stack ${AWS::StackName} --region ${AWS::Region} --resource BastionAutoScalingGroup
              exit 0
            }

            until git clone https://github.com/aws-quickstart/quickstart-linux-utilities.git ; do echo "Retrying"; done
            cd /quickstart-linux-utilities;
            source quickstart-cfn-tools.source;
            qs_update-os || qs_err;
            #qs_bootstrap_pip || qs_err " pip bootstrap failed ";
            qs_aws-cfn-bootstrap || qs_err " cfn bootstrap failed ";

            EIP_LIST="${EIP1},${EIP2},${EIP3},${EIP4}"
            CLOUDWATCHGROUP=${BastionMainLogGroup}
            cfn-init -v --stack '${AWS::StackName}' --resource BastionLaunchConfiguration --region ${AWS::Region} || cfn_fail
            [ $(qs_status) == 0 ] && cfn_success || cfn_fail 
          - EIP2:
              !If
              - 2BastionCondition
              - !Ref EIP2
              - 'Null'
            EIP3:
              !If
              - 3BastionCondition
              - !Ref EIP3
              - 'Null'
            EIP4:
              !If
              - 4BastionCondition
              - !Ref EIP4
              - 'Null'
  BastionSecurityGroup:
    Type: 'AWS::EC2::SecurityGroup'
    Properties:
      GroupDescription: Enables SSH Access to Bastion Hosts
      VpcId: !Ref VPCID
      SecurityGroupIngress:
        - IpProtocol: tcp
          FromPort: 22
          ToPort: 22
          CidrIp: !Ref RemoteAccessCIDR
        - IpProtocol: icmp
          FromPort: -1
          ToPort: -1
          CidrIp: !Ref RemoteAccessCIDR
Outputs:
  BastionAutoScalingGroup:
    Description: Auto Scaling Group Reference ID
    Value: !Ref BastionAutoScalingGroup
    Export:
      Name: !Sub '${AWS::StackName}-BastionAutoScalingGroup'
  EIP1:
    Description: Elastic IP 1 for Bastion
    Value: !Ref EIP1
    Export:
      Name: !Sub '${AWS::StackName}-EIP1'
  EIP2:
    Condition: 2BastionCondition
    Description: Elastic IP 2 for Bastion
    Value: !Ref EIP2
    Export:
      Name: !Sub '${AWS::StackName}-EIP2'
  EIP3:
    Condition: 3BastionCondition
    Description: Elastic IP 3 for Bastion
    Value: !Ref EIP3
    Export:
      Name: !Sub '${AWS::StackName}-EIP3'
  EIP4:
    Condition: 4BastionCondition
    Description: Elastic IP 4 for Bastion
    Value: !Ref EIP4
    Export:
      Name: !Sub '${AWS::StackName}-EIP4'
  CloudWatchLogs:
    Description: CloudWatch Logs GroupName. Your SSH logs will be stored here.
    Value: !Ref BastionMainLogGroup
    Export:
      Name: !Sub '${AWS::StackName}-CloudWatchLogs'
  BastionSecurityGroupID:
    Description: Bastion Security Group ID
    Value: !Ref BastionSecurityGroup
    Export:
      Name: !Sub '${AWS::StackName}-BastionSecurityGroupID'
  BastionHostRole:
    Description: Bastion IAM Role name
    Value: !If
      - CreateIAMRole
      - !Ref BastionHostRole
      - !Ref AlternativeIAMRole
    Export:
      Name: !Sub '${AWS::StackName}-BastionHostRole'