vpc-vpn-bastion.yaml

---
# Copyright 2018 widdix GmbH
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
AWSTemplateFormatVersion: '2010-09-09'
Description: 'VPC: highly available SoftEther VPN bastion host/instance, a cloudonaut.io template, sponsored by https://github.com/ngault'
Metadata:
  'AWS::CloudFormation::Interface':
    ParameterGroups:
    - Label:
        default: 'Parent Stacks'
      Parameters:
      - ParentVPCStack
      - ParentAlertStack
      - ParentZoneStack
    - Label:
        default: 'EC2 Parameters'
      Parameters:
      - InstanceType
      - KeyName
      - IAMUserSSHAccess
      - SystemsManagerAccess
      - LogsRetentionInDays
      - SubDomainNameWithDot
      - ManagedPolicyArns
    - Label:
        default: 'EFS Parameters'
      Parameters:
      - EFSProvisionedThroughputInMibps
      - EFSBackupRetentionPeriod
      - EFSBackupScheduleExpression
    - Label:
        default: 'VPN Parameters'
      Parameters:
      - VPNPSK
      - VPNUserName
      - VPNUserPassword
      - VPNAdminPassword
    - Label:
        default: 'Permission Parameters'
      Parameters:
      - PermissionsBoundary
Parameters:
  ParentVPCStack:
    Description: 'Stack name of parent VPC stack based on vpc/vpc-*azs.yaml template.'
    Type: String
  ParentAlertStack:
    Description: 'Optional but recommended stack name of parent alert stack based on operations/alert.yaml template.'
    Type: String
    Default: ''
  ParentZoneStack:
    Description: 'Optional stack name of parent zone stack based on vpc/zone-*.yaml template.'
    Type: String
    Default: ''
  PermissionsBoundary:
    Description: 'Optional ARN for a policy that will be used as the permission boundary for all roles created by this template.'
    Type: String
    Default: ''
  KeyName:
    Description: 'Optional key pair of the ec2-user to establish a SSH connection to SoftEther VPN.'
    Type: String
    Default: ''
  IAMUserSSHAccess:
    Description: 'Synchronize public keys of IAM users to enable personalized SSH access (Doc: https://cloudonaut.io/manage-aws-ec2-ssh-access-with-iam/).'
    Type: String
    Default: false
    AllowedValues:
    - true
    - false
  SystemsManagerAccess:
    Description: 'Enable AWS Systems Manager agent and authorization.'
    Type: String
    Default: true
    AllowedValues:
    - true
    - false
  InstanceType:
    Description: 'Instance type of SoftEther VPN.'
    Type: String
    Default: 't2.micro'
  LogsRetentionInDays:
    Description: 'Specifies the number of days you want to retain log events.'
    Type: Number
    Default: 14
    AllowedValues: [1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1827, 3653]
  SubDomainNameWithDot:
    Description: 'Name that is used to create the DNS entry with trailing dot, e.g. §{SubDomainNameWithDot}§{HostedZoneName}. Leave blank for naked (or apex and bare) domain. Requires ParentZoneStack parameter!'
    Type: String
    Default: 'vpn.'
  ManagedPolicyArns:
    Description: 'Optional comma-delimited list of IAM managed policy ARNs to attach to the instance''s IAM role'
    Type: String
    Default: ''
  VPNPSK:
    Description: 'Specify the IPsec Pre-Shared Key.'
    Type: String
    NoEcho: true
  VPNUserName:
    Description: 'VPN user name.'
    Type: String
  VPNUserPassword:
    Description: 'VPN user password.'
    Type: String
    NoEcho: true
  VPNAdminPassword:
    Description: 'SoftEther VPN admin password.'
    Type: String
    NoEcho: true
  EFSProvisionedThroughputInMibps:
    Description: 'The provisioned throughput for the Elastic File System (EFS) in Mibps. Default is 0 which enables the bursting mode and disables provisioned throughput.'
    Type: Number
    Default: 0
  EFSBackupRetentionPeriod:
    Description: 'The number of days to keep backups of the EFS file system (set to 0 to disable).'
    Type: Number
    MinValue: 0
    MaxValue: 35
    Default: 30
  EFSBackupScheduleExpression:
    Description: 'A CRON expression specifying when AWS Backup initiates a backup job.'
    Type: String
    Default: 'cron(0 5 ? * * *)'
Mappings:
  RegionMap:
    'af-south-1':
      AMI: 'ami-050312a64b6fd7ad9'
    'eu-north-1':
      AMI: 'ami-076c2ee28e3f9f38e'
    'ap-south-1':
      AMI: 'ami-068d43a544160b7ef'
    'eu-west-3':
      AMI: 'ami-0575fc648136871a1'
    'eu-west-2':
      AMI: 'ami-01c835443b86fe988'
    'eu-south-1':
      AMI: 'ami-0458384bd8b7c17d4'
    'eu-west-1':
      AMI: 'ami-0d712b3e6e1f798ef'
    'ap-northeast-3':
      AMI: 'ami-039fe1eba495c966f'
    'ap-northeast-2':
      AMI: 'ami-081511b9e3af53902'
    'me-south-1':
      AMI: 'ami-0a70a3362a013de22'
    'ap-northeast-1':
      AMI: 'ami-0bc8ae3ec8e338cbc'
    'sa-east-1':
      AMI: 'ami-0ca43e15336e41670'
    'ca-central-1':
      AMI: 'ami-09d75fc0586859f7a'
    'ap-east-1':
      AMI: 'ami-093d73f27794c5b1d'
    'ap-southeast-1':
      AMI: 'ami-0ba0ce0c11eb723a1'
    'ap-southeast-2':
      AMI: 'ami-0b3d7a5ecc2daba4c'
    'eu-central-1':
      AMI: 'ami-013fffc873b1eaa1c'
    'us-east-1':
      AMI: 'ami-0533f2ba8a1995cf9'
    'us-east-2':
      AMI: 'ami-089c6f2e3866f0f14'
    'us-west-1':
      AMI: 'ami-0a245a00f741d6301'
    'us-west-2':
      AMI: 'ami-05b622b5fa0269787'
Conditions:
  HasPermissionsBoundary: !Not [!Equals [!Ref PermissionsBoundary, '']]
  HasKeyName: !Not [!Equals [!Ref KeyName, '']]
  HasIAMUserSSHAccess: !Equals [!Ref IAMUserSSHAccess, 'true']
  HasSystemsManagerAccess: !Equals [!Ref SystemsManagerAccess, 'true']
  HasAlertTopic: !Not [!Equals [!Ref ParentAlertStack, '']]
  HasZone: !Not [!Equals [!Ref ParentZoneStack, '']]
  HasManagedPolicyArns: !Not [!Equals [!Ref ManagedPolicyArns, '']]
  HasEFSProvisionedThroughput: !Not [!Condition HasNotEFSProvisionedThroughput]
  HasNotEFSProvisionedThroughput: !Equals [!Ref EFSProvisionedThroughputInMibps, '0']
  HasAlertTopicAndEFSProvisionedThroughput: !And [!Condition HasAlertTopic, !Condition HasEFSProvisionedThroughput]
  HasAlertTopicAndNotEFSProvisionedThroughput: !And [!Condition HasAlertTopic, !Condition HasNotEFSProvisionedThroughput]
  HasEFSBackupRetentionPeriod: !Not [!Equals [!Ref EFSBackupRetentionPeriod, 0]]
Resources:
  StorageSG:
    Type: 'AWS::EC2::SecurityGroup'
    Properties:
      GroupDescription: !Sub '${AWS::StackName}-storage'
      VpcId: {'Fn::ImportValue': !Sub '${ParentVPCStack}-VPC'}
      SecurityGroupIngress:
      - SourceSecurityGroupId: !Ref SecurityGroup
        FromPort: 2049
        ToPort: 2049
        IpProtocol: tcp
  Storage:
    Type: 'AWS::EFS::FileSystem'
    Properties:
      ThroughputMode: !If [HasEFSProvisionedThroughput, 'provisioned', 'bursting']
      ProvisionedThroughputInMibps: !If [HasEFSProvisionedThroughput, !Ref EFSProvisionedThroughputInMibps, !Ref 'AWS::NoValue']
      FileSystemTags:
      - Key: Name
        Value: !Ref 'AWS::StackName'
      PerformanceMode: generalPurpose
  StorageBurstCreditBalanceTooLowAlarm:
    Condition: HasAlertTopicAndNotEFSProvisionedThroughput
    Type: 'AWS::CloudWatch::Alarm'
    Properties:
      AlarmDescription: 'Average burst credit balance over last 10 minutes too low, expect a significant performance drop soon.'
      Namespace: 'AWS/EFS'
      MetricName: BurstCreditBalance
      Statistic: Average
      Period: 600
      EvaluationPeriods: 1
      ComparisonOperator: LessThanThreshold
      Threshold: 192000000000 # 192 GB in Bytes (last hour where you can burst at 100 MB/sec)
      AlarmActions:
      - {'Fn::ImportValue': !Sub '${ParentAlertStack}-TopicARN'}
      Dimensions:
      - Name: FileSystemId
        Value: !Ref Storage
  StoragePercentIOLimitTooHighAlarm:
    Condition: HasAlertTopicAndNotEFSProvisionedThroughput
    Type: 'AWS::CloudWatch::Alarm'
    Properties:
      AlarmDescription: 'I/O limit has been reached, consider using Max I/O performance mode.'
      Namespace: 'AWS/EFS'
      MetricName: PercentIOLimit
      Statistic: Maximum
      Period: 600
      EvaluationPeriods: 3
      ComparisonOperator: GreaterThanThreshold
      Threshold: 95
      AlarmActions:
      - {'Fn::ImportValue': !Sub '${ParentAlertStack}-TopicARN'}
      Dimensions:
      - Name: FileSystemId
        Value: !Ref Storage
  StorageThroughputAlarm:
    Condition: HasAlertTopicAndEFSProvisionedThroughput
    Type: 'AWS::CloudWatch::Alarm'
    Properties:
      AlarmDescription: 'Reached 90% of the provisioned throughput over last 10 minutes.'
      Namespace: 'AWS/EFS'
      MetricName: TotalIOBytes
      Statistic: Sum
      Period: 600
      EvaluationPeriods: 1
      ComparisonOperator: GreaterThanThreshold
      Threshold: !GetAtt MaxThroughputCalculator.Threshold
      AlarmActions:
      - {'Fn::ImportValue': !Sub '${ParentAlertStack}-TopicARN'}
      Dimensions:
      - Name: FileSystemId
        Value: !Ref Storage
  StorageMountTargetA:
    Type: 'AWS::EFS::MountTarget'
    Properties:
      FileSystemId: !Ref Storage
      SecurityGroups:
      - !Ref StorageSG
      SubnetId: {'Fn::ImportValue': !Sub '${ParentVPCStack}-SubnetAPublic'}
  StorageMountTargetB:
    Type: 'AWS::EFS::MountTarget'
    Properties:
      FileSystemId: !Ref Storage
      SecurityGroups:
      - !Ref StorageSG
      SubnetId: {'Fn::ImportValue': !Sub '${ParentVPCStack}-SubnetBPublic'}
  RecordSet:
    Condition: HasZone
    Type: 'AWS::Route53::RecordSet'
    Properties:
      HostedZoneId: {'Fn::ImportValue': !Sub '${ParentZoneStack}-HostedZoneId'}
      Name: !Sub
      - '${SubDomainNameWithDot}${HostedZoneName}'
      - SubDomainNameWithDot: !Ref SubDomainNameWithDot
        HostedZoneName: {'Fn::ImportValue': !Sub '${ParentZoneStack}-HostedZoneName'}
      ResourceRecords:
      - !Ref EIP
      TTL: 60
      Type: A
  EIP:
    Type: 'AWS::EC2::EIP'
    Properties:
      Domain: vpc
  Logs:
    Type: 'AWS::Logs::LogGroup'
    Properties:
      RetentionInDays: !Ref LogsRetentionInDays
  SecurityGroup:
    Type: 'AWS::EC2::SecurityGroup'
    Properties:
      GroupDescription: !Ref 'AWS::StackName'
      SecurityGroupIngress:
      - CidrIp: '0.0.0.0/0'
        IpProtocol: tcp
        FromPort: 443
        ToPort: 443
      - CidrIp: '0.0.0.0/0'
        IpProtocol: tcp
        FromPort: 992
        ToPort: 992
      - CidrIp: '0.0.0.0/0'
        IpProtocol: tcp
        FromPort: 5555
        ToPort: 5555
      - CidrIp: 0.0.0.0/0
        IpProtocol: udp
        FromPort: 40000
        ToPort: 44999
      - CidrIp: 0.0.0.0/0
        IpProtocol: udp
        FromPort: 500
        ToPort: 500
      - CidrIp: 0.0.0.0/0
        IpProtocol: udp
        FromPort: 1194
        ToPort: 1194
      - CidrIp: 0.0.0.0/0
        IpProtocol: udp
        FromPort: 4500
        ToPort: 4500
      VpcId: {'Fn::ImportValue': !Sub '${ParentVPCStack}-VPC'}
  SecurityGroupInSSHBastion:
    Type: 'AWS::EC2::SecurityGroupIngress'
    Properties:
      GroupId: !Ref SecurityGroup
      IpProtocol: tcp
      FromPort: 22
      ToPort: 22
      SourceSecurityGroupId: !Ref SecurityGroup
  InstanceProfile:
    Type: 'AWS::IAM::InstanceProfile'
    Properties:
      Roles:
      - !Ref IAMRole
  IAMRole:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
        - Effect: Allow
          Principal:
            Service: 'ec2.amazonaws.com'
          Action: 'sts:AssumeRole'
      ManagedPolicyArns: !If [HasManagedPolicyArns, !Split [',', !Ref ManagedPolicyArns], !Ref 'AWS::NoValue']
      PermissionsBoundary: !If [HasPermissionsBoundary, !Ref PermissionsBoundary, !Ref 'AWS::NoValue']
      Policies:
      - !If
        - HasSystemsManagerAccess
        - PolicyName: ssm
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
            - Effect: Allow
              Action:
              - 'ssmmessages:*' # SSM Agent by https://docs.aws.amazon.com/systems-manager/latest/userguide/systems-manager-setting-up-messageAPIs.html
              - 'ssm:UpdateInstanceInformation' # SSM agent by https://docs.aws.amazon.com/systems-manager/latest/userguide/systems-manager-setting-up-messageAPIs.html
              - 'ec2messages:*' # SSM Session Manager by https://docs.aws.amazon.com/systems-manager/latest/userguide/systems-manager-setting-up-messageAPIs.html
              Resource: '*'
        - !Ref 'AWS::NoValue'
      - PolicyName: 'ec2'
        PolicyDocument:
          Version: '2012-10-17'
          Statement:
          - Effect: Allow
            Action:
            - 'ec2:AssociateAddress'
            - 'ec2:ModifyInstanceAttribute'
            Resource: '*'
      - PolicyName: logs
        PolicyDocument:
          Version: '2012-10-17'
          Statement:
          - Effect: Allow
            Action:
            - 'logs:CreateLogGroup'
            - 'logs:CreateLogStream'
            - 'logs:PutLogEvents'
            - 'logs:DescribeLogStreams'
            Resource: !GetAtt 'Logs.Arn'
  IAMPolicySSHAccess:
    Type: 'AWS::IAM::Policy'
    Condition: HasIAMUserSSHAccess
    Properties:
      Roles:
      - !Ref IAMRole
      PolicyName: iam
      PolicyDocument:
        Version: '2012-10-17'
        Statement:
        - Effect: Allow
          Action: 'iam:ListUsers'
          Resource: '*'
        - Effect: Allow
          Action:
          - 'iam:ListSSHPublicKeys'
          - 'iam:GetSSHPublicKey'
          Resource: !Sub 'arn:aws:iam::${AWS::AccountId}:user/*'
  LaunchTemplate:
    Type: 'AWS::EC2::LaunchTemplate'
    Metadata:
      'AWS::CloudFormation::Init':
        configSets:
          default: !If [HasIAMUserSSHAccess, [awslogs, ssh-access, mount, install, config], [awslogs, mount, install, config]]
        awslogs:
          packages:
            yum:
              awslogs: []
          files:
            '/etc/awslogs/awscli.conf':
              content: !Sub |
                [default]
                region = ${AWS::Region}
                [plugins]
                cwlogs = cwlogs
              mode: '000644'
              owner: root
              group: root
            '/etc/awslogs/awslogs.conf':
              content: !Sub |
                [general]
                state_file = /var/lib/awslogs/agent-state
                [/var/log/amazon/ssm/amazon-ssm-agent.log]
                datetime_format = %Y-%m-%d %H:%M:%S
                file = /var/log/amazon/ssm/amazon-ssm-agent.log
                log_stream_name = {instance_id}/var/log/amazon/ssm/amazon-ssm-agent.log
                log_group_name = ${Logs}
                [/var/log/amazon/ssm/errors.log]
                datetime_format = %Y-%m-%d %H:%M:%S
                file = /var/log/amazon/ssm/errors.log
                log_stream_name = {instance_id}/var/log/amazon/ssm/errors.log
                log_group_name = ${Logs}
                [/var/log/audit/audit.log]
                file = /var/log/audit/audit.log
                log_stream_name = {instance_id}/var/log/audit/audit.log
                log_group_name = ${Logs}
                [/var/log/awslogs.log]
                datetime_format = %Y-%m-%d %H:%M:%S
                file = /var/log/awslogs.log
                log_stream_name = {instance_id}/var/log/awslogs.log
                log_group_name = ${Logs}
                [/var/log/boot.log]
                file = /var/log/boot.log
                log_stream_name = {instance_id}/var/log/boot.log
                log_group_name = ${Logs}
                [/var/log/cfn-hup.log]
                datetime_format = %Y-%m-%d %H:%M:%S
                file = /var/log/cfn-hup.log
                log_stream_name = {instance_id}/var/log/cfn-hup.log
                log_group_name = ${Logs}
                [/var/log/cfn-init-cmd.log]
                datetime_format = %Y-%m-%d %H:%M:%S
                file = /var/log/cfn-init-cmd.log
                log_stream_name = {instance_id}/var/log/cfn-init-cmd.log
                log_group_name = ${Logs}
                [/var/log/cfn-init.log]
                datetime_format = %Y-%m-%d %H:%M:%S
                file = /var/log/cfn-init.log
                log_stream_name = {instance_id}/var/log/cfn-init.log
                log_group_name = ${Logs}
                [/var/log/cfn-wire.log]
                datetime_format = %Y-%m-%d %H:%M:%S
                file = /var/log/cfn-wire.log
                log_stream_name = {instance_id}/var/log/cfn-wire.log
                log_group_name = ${Logs}
                [/var/log/cloud-init-output.log]
                file = /var/log/cloud-init-output.log
                log_stream_name = {instance_id}/var/log/cloud-init-output.log
                log_group_name = ${Logs}
                [/var/log/cloud-init.log]
                datetime_format = %b %d %H:%M:%S
                file = /var/log/cloud-init.log
                log_stream_name = {instance_id}/var/log/cloud-init.log
                log_group_name = ${Logs}
                [/var/log/cron]
                datetime_format = %b %d %H:%M:%S
                file = /var/log/cron
                log_stream_name = {instance_id}/var/log/cron
                log_group_name = ${Logs}
                [/var/log/dmesg]
                file = /var/log/dmesg
                log_stream_name = {instance_id}/var/log/dmesg
                log_group_name = ${Logs}
                [/var/log/grubby_prune_debug]
                file = /var/log/grubby_prune_debug
                log_stream_name = {instance_id}/var/log/grubby_prune_debug
                log_group_name = ${Logs}
                [/var/log/maillog]
                datetime_format = %b %d %H:%M:%S
                file = /var/log/maillog
                log_stream_name = {instance_id}/var/log/maillog
                log_group_name = ${Logs}
                [/var/log/messages]
                datetime_format = %b %d %H:%M:%S
                file = /var/log/messages
                log_stream_name = {instance_id}/var/log/messages
                log_group_name = ${Logs}
                [/var/log/secure]
                datetime_format = %b %d %H:%M:%S
                file = /var/log/secure
                log_stream_name = {instance_id}/var/log/secure
                log_group_name = ${Logs}
                [/var/log/yum.log]
                datetime_format = %b %d %H:%M:%S
                file = /var/log/yum.log
                log_stream_name = {instance_id}/var/log/yum.log
                log_group_name = ${Logs}
              mode: '000644'
              owner: root
              group: root
            '/etc/awslogs/config/efs.conf':
              content: !Sub |
                [/var/log/amazon/efs/mount.log]
                datetime_format = %Y-%m-%d %H:%M:%S
                file = /var/log/amazon/efs/mount.log
                log_stream_name = {instance_id}/var/log/amazon/efs/mount.log
                log_group_name = ${Logs}
              mode: '000644'
              owner: root
              group: root
            '/etc/awslogs/config/vpnserver.conf':
              content: !Sub |
                [/usr/local/vpnserver/packet_log/DEFAULT/pkt.log]
                datetime_format = %Y-%m-%d,%H:%M:%S
                file = /usr/local/vpnserver/packet_log/DEFAULT/pkt_*.log
                log_stream_name = {instance_id}/usr/local/vpnserver/packet_log/DEFAULT/pkt.log
                log_group_name = ${Logs}
                [/usr/local/vpnserver/security_log/DEFAULT/sec.log]
                datetime_format = %Y-%m-%d %H:%M:%S
                file = /usr/local/vpnserver/security_log/DEFAULT/sec_*.log
                log_stream_name = {instance_id}/usr/local/vpnserver/security_log/DEFAULT/sec.log
                log_group_name = ${Logs}
                [/usr/local/vpnserver/server_log/vpn.log]
                datetime_format = %Y-%m-%d %H:%M:%S
                file = /usr/local/vpnserver/server_log/vpn_*.log
                log_stream_name = {instance_id}/usr/local/vpnserver/server_log/vpn.log
                log_group_name = ${Logs}
              mode: '000644'
              owner: root
              group: root
          services:
            sysvinit:
              awslogsd:
                enabled: true
                ensureRunning: true
                packages:
                  yum:
                  - awslogs
                files:
                - '/etc/awslogs/awslogs.conf'
                - '/etc/awslogs/awscli.conf'
                - '/etc/awslogs/config/efs.conf'
                - '/etc/awslogs/config/vpnserver.conf'
        ssh-access:
          files:
            '/opt/authorized_keys_command.sh':
              content: |
                #!/bin/bash -e
                if [ -z "$1" ]; then
                  exit 1
                fi
                UnsaveUserName="$1"
                UnsaveUserName=${UnsaveUserName//".plus."/"+"}
                UnsaveUserName=${UnsaveUserName//".equal."/"="}
                UnsaveUserName=${UnsaveUserName//".comma."/","}
                UnsaveUserName=${UnsaveUserName//".at."/"@"}
                aws iam list-ssh-public-keys --user-name "$UnsaveUserName" --query "SSHPublicKeys[?Status == 'Active'].[SSHPublicKeyId]" --output text | while read -r KeyId; do
                  aws iam get-ssh-public-key --user-name "$UnsaveUserName" --ssh-public-key-id "$KeyId" --encoding SSH --query "SSHPublicKey.SSHPublicKeyBody" --output text
                done
              mode: '000755'
              owner: root
              group: root
            '/opt/import_users.sh':
              content: |
                #!/bin/bash -e
                aws iam list-users --query "Users[].[UserName]" --output text | while read User; do
                  SaveUserName="$User"
                  SaveUserName=${SaveUserName//"+"/".plus."}
                  SaveUserName=${SaveUserName//"="/".equal."}
                  SaveUserName=${SaveUserName//","/".comma."}
                  SaveUserName=${SaveUserName//"@"/".at."}
                  if [ "${#SaveUserName}" -le "32" ]; then
                    if ! id -u "$SaveUserName" >/dev/null 2>&1; then
                      #sudo will read each file in /etc/sudoers.d, skipping file names that end in ‘~’ or contain a ‘.’ character to avoid causing problems with package manager or editor temporary/backup files.
                      SaveUserFileName=$(echo "$SaveUserName" | tr "." " ")
                      /usr/sbin/useradd "$SaveUserName"
                      echo "$SaveUserName ALL=(ALL) NOPASSWD:ALL" > "/etc/sudoers.d/$SaveUserFileName"
                    fi
                  else
                    echo "Can not import IAM user ${SaveUserName}. User name is longer than 32 characters."
                  fi
                done
              mode: '000755'
              owner: root
              group: root
            '/etc/cron.d/import_users':
              content: |
                */10 * * * * root /opt/import_users.sh
              mode: '000644'
              owner: root
              group: root
          commands:
            'a_configure_sshd_command':
              command: 'sed -e ''/AuthorizedKeysCommand / s/^#*/#/'' -i /etc/ssh/sshd_config; echo -e ''\nAuthorizedKeysCommand /opt/authorized_keys_command.sh'' >> /etc/ssh/sshd_config'
              test: '! grep -q ''^AuthorizedKeysCommand /opt/authorized_keys_command.sh'' /etc/ssh/sshd_config'
            'b_configure_sshd_commanduser':
              command: 'sed -e ''/AuthorizedKeysCommandUser / s/^#*/#/'' -i /etc/ssh/sshd_config; echo -e ''\nAuthorizedKeysCommandUser nobody'' >> /etc/ssh/sshd_config'
              test: '! grep -q ''^AuthorizedKeysCommandUser nobody'' /etc/ssh/sshd_config'
            'c_import_users':
              command: './import_users.sh'
              cwd: '/opt'
          services:
            sysvinit:
              sshd:
                enabled: true
                ensureRunning: true
                commands:
                - 'a_configure_sshd_command'
                - 'b_configure_sshd_commanduser'
        mount:
          packages:
            yum:
              'amazon-efs-utils': []
          commands:
            'a_mount':
              command: !Sub 'mkdir /mnt/storage && echo "${Storage}:/ /mnt/storage efs tls,_netdev 0 0" >> /etc/fstab && while ! (echo > /dev/tcp/${Storage}.efs.${AWS::Region}.amazonaws.com/2049) >/dev/null 2>&1; do sleep 5; done && mount -a -t efs'
              test: '[ ! -d /mnt/storage ]'
            'b_mkdir_backup':
              command: 'mkdir backup.vpn_server.config && chmod 700 backup.vpn_server.config'
              cwd: '/mnt/storage'
              test: '[ ! -d /mnt/storage/backup.vpn_server.config ]'
        install:
          sources:
            '/usr/local/src/softether': 'http://www.softether-download.com/files/softether/v4.29-9680-rtm-2019.02.28-tree/Linux/SoftEther_VPN_Server/64bit_-_Intel_x64_or_AMD64/softether-vpnserver-v4.29-9680-rtm-2019.02.28-linux-x64-64bit.tar.gz'
          files:
            '/etc/init.d/vpnserver':
              content: |
                #!/bin/sh
                # chkconfig: 2345 99 01
                # description: SoftEther VPN Server
                DAEMON=/usr/local/vpnserver/vpnserver
                LOCK=/var/lock/subsys/vpnserver
                test -x $DAEMON || exit 0
                case "$1" in
                start)
                $DAEMON start
                touch $LOCK
                ;;
                stop)
                $DAEMON stop
                rm $LOCK
                ;;
                restart)
                $DAEMON stop
                sleep 3
                $DAEMON start
                ;;
                *)
                echo "Usage: $0 {start|stop|restart}"
                exit 1
                esac
                exit 0
              mode: '000755'
              owner: root
              group: root
          commands:
            'a_install_dev_tools':
              command: 'yum -y group install "Development Tools"' # can this be reduced to yum install gcc make? see 7.3.3 https://www.softether.org/4-docs/1-manual/7._Installing_SoftEther_VPN_Server/7.3_Install_on_Linux_and_Initial_Configurations
              test: '[ ! -d /usr/local/vpnserver ]'
            'b_make':
              command: 'yes 1 | make'
              cwd: '/usr/local/src/softether/vpnserver'
              test: '[ ! -d /usr/local/vpnserver ]'
            'c_chmod':
              command: 'chmod 600 * && chmod 700 vpncmd vpnserver'
              cwd: '/usr/local/src/softether/vpnserver'
              test: '[ ! -d /usr/local/vpnserver ]'
            'd_move':
              command: 'mv /usr/local/src/softether/vpnserver /usr/local/vpnserver'
              test: '[ ! -d /usr/local/vpnserver ]'
            'e_mount_config_backup':
              command: 'mkdir /usr/local/vpnserver/backup.vpn_server.config && mount --bind /mnt/storage/backup.vpn_server.config /usr/local/vpnserver/backup.vpn_server.config'
              test: '[ ! -d /usr/local/vpnserver/backup.vpn_server.config ]'
            'f_link_config':
              command: 'ln -s /mnt/storage/vpn_server.config /usr/local/vpnserver/vpn_server.config'
              test: '[ ! -f /usr/local/vpnserver/vpn_server.config ]'
          services:
            sysvinit:
              vpnserver:
                enabled: true
                ensureRunning: true
        config:
          files:
            '/etc/cfn/cfn-hup.conf':
              content: !Sub |
                [main]
                stack=${AWS::StackId}
                region=${AWS::Region}
                interval=1
              mode: '000400'
              owner: root
              group: root
            '/etc/cfn/hooks.d/cfn-auto-reloader.conf':
              content: !Sub |
                [cfn-auto-reloader-hook]
                triggers=post.update
                path=Resources.LaunchTemplate.Metadata.AWS::CloudFormation::Init
                action=/opt/aws/bin/cfn-init --verbose --stack=${AWS::StackName} --region=${AWS::Region} --resource=LaunchTemplate
                runas=root
          commands:
            'a_await_vpnserver':
              command: 'while ! (echo > /dev/tcp/localhost/443) >/dev/null 2>&1; do sleep 10; done'
            'b_set_password':
              command: !Sub './vpncmd /server localhost /cmd ServerPasswordSet ${VPNAdminPassword} && touch /mnt/storage/config_set_password_done.txt'
              cwd: '/usr/local/vpnserver'
              test: '[ ! -f /mnt/storage/config_set_password_done.txt ]'
            'c_create_local_bridge': # tap prevents high cpu usage http://forum.softether.org/viewtopic.php?t=2922
              command: !Sub './vpncmd /server localhost /password:${VPNAdminPassword} /cmd BridgeCreate DEFAULT /device:tap /TAP:yes && touch /mnt/storage/config_create_local_bridge_done.txt'
              cwd: '/usr/local/vpnserver'
              test: '[ ! -f /mnt/storage/config_create_local_bridge_done.txt ]'
            'd_disable_kernel_mode_secure_nat': # prevents high CPU usage http://www.vpnusers.com/viewtopic.php?f=7&t=1216&p=10815
              command: !Sub './vpncmd /server localhost /password:${VPNAdminPassword} /adminhub:DEFAULT /cmd ExtOptionSet DisableKernelModeSecureNAT /VALUE:1 && touch /mnt/storage/config_disable_kernel_mode_secure_nat_done.txt'
              cwd: '/usr/local/vpnserver'
              test: '[ ! -f /mnt/storage/config_disable_kernel_mode_secure_nat_done.txt ]'
            'e_enable_secure_nat':
              command: !Sub './vpncmd /server localhost /password:${VPNAdminPassword} /adminhub:DEFAULT /cmd SecureNatEnable && touch /mnt/storage/config_enable_secure_nat_done.txt'
              cwd: '/usr/local/vpnserver'
              test: '[ ! -f /mnt/storage/config_enable_secure_nat_done.txt ]'
            'f_set_dhcp_set': # needed for split tunnel
              command: !Sub
              - './vpncmd /server localhost /password:${VPNAdminPassword} /adminhub:DEFAULT /cmd DhcpSet /START:192.168.30.10 /END:192.168.30.200 /MASK:255.255.255.0 /EXPIRE:7200 /GW:none /DNS:192.168.30.1 /DNS2:none /DOMAIN:none /PUSHROUTE:${VPCCidrBlock}/192.168.30.1 /LOG:yes && touch /mnt/storage/config_disable_defaut_gateway_client_notification_done.txt'
              - VPNAdminPassword: !Ref VPNAdminPassword
                VPCCidrBlock: {'Fn::ImportValue': !Sub '${ParentVPCStack}-CidrBlock'}
              cwd: '/usr/local/vpnserver'
              test: '[ ! -f /mnt/storage/config_disable_defaut_gateway_client_notification_done.txt ]'
            'g_enable_ipsec_psk':
              command: !Sub './vpncmd /server localhost /password:${VPNAdminPassword} /cmd IPsecEnable /L2TP:yes /L2TPRAW:yes /ETHERIP:no /PSK:${VPNPSK} /DEFAULTHUB:DEFAULT && touch /mnt/storage/config_enable_ipsec_psk_done.txt'
              cwd: '/usr/local/vpnserver'
              test: '[ ! -f /mnt/storage/config_enable_ipsec_psk_done.txt ]'
            'h_create_user':
              command: !Sub './vpncmd /server localhost /password:${VPNAdminPassword} /adminhub:DEFAULT /cmd UserCreate ${VPNUserName} /GROUP:none /REALNAME:none /NOTE:none && touch /mnt/storage/config_create_user_done.txt'
              cwd: '/usr/local/vpnserver'
              test: '[ ! -f /mnt/storage/config_create_user_done.txt ]'
            'i_set_user_password':
              command: !Sub './vpncmd /server localhost /password:${VPNAdminPassword} /adminhub:DEFAULT /cmd UserPasswordSet ${VPNUserName} /PASSWORD:${VPNUserPassword} && touch /mnt/storage/config_set_user_password_done.txt'
              cwd: '/usr/local/vpnserver'
              test: '[ ! -f /mnt/storage/config_set_user_password_done.txt ]'
          services:
            sysvinit:
              cfn-hup:
                enabled: true
                ensureRunning: true
                files:
                - '/etc/cfn/cfn-hup.conf'
                - '/etc/cfn/hooks.d/cfn-auto-reloader.conf'
              amazon-ssm-agent:
                enabled: !If [HasSystemsManagerAccess, true, false]
                ensureRunning: !If [HasSystemsManagerAccess, true, false]
    Properties:
      LaunchTemplateData:
        BlockDeviceMappings:
        - DeviceName: '/dev/xvda'
          Ebs:
            Encrypted: true
            VolumeType: gp3
        IamInstanceProfile:
          Name: !Ref InstanceProfile
        ImageId: !FindInMap [RegionMap, !Ref 'AWS::Region', AMI]
        InstanceType: !Ref InstanceType
        KeyName: !If [HasKeyName, !Ref KeyName, !Ref 'AWS::NoValue']
        MetadataOptions:
          HttpTokens: required
        NetworkInterfaces:
        - AssociatePublicIpAddress: true
          DeviceIndex: 0
          Groups:
          - !Ref SecurityGroup
        UserData:
          'Fn::Base64': !Sub |
            #!/bin/bash -ex
            trap '/opt/aws/bin/cfn-signal -e 1 --region ${AWS::Region} --stack ${AWS::StackName} --resource AutoScalingGroup' ERR
            TOKEN=$(curl --silent --max-time 60 -X PUT http://169.254.169.254/latest/api/token -H "X-aws-ec2-metadata-token-ttl-seconds: 30")
            INSTANCEID=$(curl --silent --max-time 60 -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169.254/latest/meta-data/instance-id)
            aws --region ${AWS::Region} ec2 associate-address --instance-id $INSTANCEID --allocation-id ${EIP.AllocationId}
            aws --region ${AWS::Region} ec2 modify-instance-attribute --instance-id $INSTANCEID --source-dest-check "{\"Value\": false}"
            /opt/aws/bin/cfn-init -v --stack ${AWS::StackName} --resource LaunchTemplate --region ${AWS::Region}
            /opt/aws/bin/cfn-signal -e 0 --region ${AWS::Region} --stack ${AWS::StackName} --resource AutoScalingGroup
  AutoScalingGroup:
    Type: 'AWS::AutoScaling::AutoScalingGroup'
    DependsOn:
    - StorageMountTargetA
    - StorageMountTargetB
    Properties:
      LaunchTemplate:
        LaunchTemplateId: !Ref LaunchTemplate
        Version: !GetAtt 'LaunchTemplate.LatestVersionNumber'
      MaxSize: '1'
      MinSize: '1'
      Tags:
      - Key: Name
        Value: 'SoftEther VPN'
        PropagateAtLaunch: true
      NotificationConfigurations: !If
      - HasAlertTopic
      - - NotificationTypes:
          - 'autoscaling:EC2_INSTANCE_LAUNCH_ERROR'
          - 'autoscaling:EC2_INSTANCE_TERMINATE_ERROR'
          TopicARN: {'Fn::ImportValue': !Sub '${ParentAlertStack}-TopicARN'}
      - []
      VPCZoneIdentifier:
      - {'Fn::ImportValue': !Sub '${ParentVPCStack}-SubnetAPublic'}
      - {'Fn::ImportValue': !Sub '${ParentVPCStack}-SubnetBPublic'}
    CreationPolicy:
      ResourceSignal:
        Count: 1
        Timeout: PT10M
    UpdatePolicy:
      AutoScalingRollingUpdate:
        PauseTime: PT10M
        SuspendProcesses:
        - HealthCheck
        - ReplaceUnhealthy
        - AZRebalance
        - AlarmNotification
        - ScheduledActions
        WaitOnResourceSignals: true
  CPUTooHighAlarm:
    Condition: HasAlertTopic
    Type: 'AWS::CloudWatch::Alarm'
    Properties:
      AlarmDescription: 'Average CPU utilization over last 10 minutes higher than 80%'
      Namespace: 'AWS/EC2'
      MetricName: CPUUtilization
      Statistic: Average
      Period: 600
      EvaluationPeriods: 1
      ComparisonOperator: GreaterThanThreshold
      Threshold: 80
      AlarmActions:
      - {'Fn::ImportValue': !Sub '${ParentAlertStack}-TopicARN'}
      Dimensions:
      - Name: AutoScalingGroupName
        Value: !Ref AutoScalingGroup
  LambdaRole:
    Condition: HasEFSProvisionedThroughput
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
        - Effect: Allow
          Principal:
            Service: 'lambda.amazonaws.com'
          Action: 'sts:AssumeRole'
      PermissionsBoundary: !If [HasPermissionsBoundary, !Ref PermissionsBoundary, !Ref 'AWS::NoValue']
  LambdaPolicy:
    Condition: HasEFSProvisionedThroughput
    Type: 'AWS::IAM::Policy'
    Properties:
      Roles:
      - !Ref LambdaRole
      PolicyName: lambda
      PolicyDocument:
        Statement:
        - Effect: Allow
          Action:
          - 'logs:CreateLogStream'
          - 'logs:PutLogEvents'
          Resource: !GetAtt 'LambdaLogGroup.Arn'
  LambdaFunction: # needs no monitoring because it is used as a custom resource
    Condition: HasEFSProvisionedThroughput
    Type: 'AWS::Lambda::Function'
    Properties:
      Code:
        ZipFile: |
          'use strict';
          const response = require('cfn-response');
          exports.handler = (event, context, cb) => {
            const throughput = parseInt(event.ResourceProperties.ThroughputInMibps, 10);
            const threshold = Math.round(throughput * 1048576 * 600 * 0.9);
            response.send(event, context, response.SUCCESS, {Threshold: threshold});
          };
      Handler: 'index.handler'
      MemorySize: 128
      Role: !GetAtt 'LambdaRole.Arn'
      Runtime: 'nodejs12.x'
      Timeout: 60
  LambdaLogGroup:
    Condition: HasEFSProvisionedThroughput
    Type: 'AWS::Logs::LogGroup'
    Properties:
      LogGroupName: !Sub '/aws/lambda/${LambdaFunction}'
      RetentionInDays: !Ref LogsRetentionInDays
  MaxThroughputCalculator:
    Condition: HasEFSProvisionedThroughput
    Type: 'Custom::MaxThroughputCalculator'
    DependsOn:
    - LambdaLogGroup
    - LambdaPolicy
    Version: '1.0'
    Properties:
      ThroughputInMibps: !Ref EFSProvisionedThroughputInMibps
      ServiceToken: !GetAtt 'LambdaFunction.Arn'
  BackupVault: # cannot be deleted with data
    Condition: HasEFSBackupRetentionPeriod
    Type: 'AWS::Backup::BackupVault'
    Properties:
      BackupVaultName: !Ref 'AWS::StackName'
      Notifications: !If [HasAlertTopic, {BackupVaultEvents: [BACKUP_JOB_STARTED, BACKUP_JOB_COMPLETED, RESTORE_JOB_STARTED, RESTORE_JOB_COMPLETED, RECOVERY_POINT_MODIFIED], SNSTopicArn: {'Fn::ImportValue': !Sub '${ParentAlertStack}-TopicARN'}}, !Ref 'AWS::NoValue']
  BackupPlan:
    Condition: HasEFSBackupRetentionPeriod
    Type: 'AWS::Backup::BackupPlan'
    Properties:
      BackupPlan:
        BackupPlanName: !Ref 'AWS::StackName'
        BackupPlanRule:
        - CompletionWindowMinutes: 1440
          Lifecycle:
            DeleteAfterDays: !Ref EFSBackupRetentionPeriod
          RuleName: !Ref 'AWS::StackName'
          ScheduleExpression: !Ref EFSBackupScheduleExpression
          StartWindowMinutes: 60
          TargetBackupVault: !Ref BackupVault
  BackupRole:
    Condition: HasEFSBackupRetentionPeriod
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
        - Effect: Allow
          Principal:
            Service: 'backup.amazonaws.com'
          Action: 'sts:AssumeRole'
      PermissionsBoundary: !If [HasPermissionsBoundary, !Ref PermissionsBoundary, !Ref 'AWS::NoValue']
      Policies:
      - PolicyName: backup
        PolicyDocument:
          Version: '2012-10-17'
          Statement:
          - Effect: Allow
            Action:
            - 'elasticfilesystem:Backup'
            - 'elasticfilesystem:DescribeTags'
            Resource: !Sub 'arn:${AWS::Partition}:elasticfilesystem:${AWS::Region}:${AWS::AccountId}:file-system/${Storage}'
  BackupSelection:
    Condition: HasEFSBackupRetentionPeriod
    Type: 'AWS::Backup::BackupSelection'
    Properties:
      BackupPlanId: !Ref BackupPlan
      BackupSelection:
        IamRoleArn: !GetAtt 'BackupRole.Arn'
        Resources:
        - !Sub 'arn:${AWS::Partition}:elasticfilesystem:${AWS::Region}:${AWS::AccountId}:file-system/${Storage}'
        SelectionName: !Ref 'AWS::StackName'
Outputs:
  TemplateID:
    Description: 'cloudonaut.io template id.'
    Value: 'vpc/vpc-vpn-bastion'
  TemplateVersion:
    Description: 'cloudonaut.io template version.'
    Value: '__VERSION__'
  StackName:
    Description: 'Stack name.'
    Value: !Sub '${AWS::StackName}'
  SecurityGroup:
    Description: 'Use this Security Group to reference incoming traffic from SoftEther VPN.'
    Value: !Ref SecurityGroup
    Export:
      Name: !Sub '${AWS::StackName}-SecurityGroup'
  IPAddress:
    Description: 'The public IP address of SoftEther VPN.'
    Value: !Ref EIP
    Export:
      Name: !Sub '${AWS::StackName}-IPAddress'