/terraform-aws-vpc

Terraform Module to create an AWS VPC network with VPN and configure Peering b/w multiple VPCs

Primary LanguageHCLApache License 2.0Apache-2.0

AWS Network Terraform module

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Terraform module to create Networking resources for workload deployment on AWS Cloud.

Usage Example

module "key_pair_vpn" {
  source             = "squareops/keypair/aws"
  environment        = "production"
  key_name           = format("%s-%s-vpn", "production", "skaf")
  ssm_parameter_path = format("%s-%s-vpn", "production", "skaf")
}


module "vpc" {
  source = "squareops/vpc/aws"

  environment                                     = "production"
  name                                            = "skaf"
  vpc_cidr                                        = "10.0.0.0/16"
  azs                                             = ["us-east-1a", "us-east-1b"]
  enable_public_subnet                            = true
  enable_private_subnet                           = true
  enable_database_subnet                          = true
  enable_intra_subnet                             = true
  one_nat_gateway_per_az                          = true
  vpn_server_enabled                              = true
  vpn_server_instance_type                        = "t3a.small"
  vpn_key_pair                                    = module.key_pair_vpn.key_pair_name
  enable_flow_log                                 = true
  flow_log_max_aggregation_interval               = 60
  flow_log_cloudwatch_log_group_retention_in_days = 90

}

Refer examples for all examples.

Important Note

To prevent destruction interruptions, any resources that have been created outside of Terraform and attached to the resources provisioned by Terraform must be deleted before the module is destroyed.

The private key generated by Keypair module will be stored in AWS Systems Manager Parameter Store. For more details refer this

Network Scenarios

Users need to declare vpc_cidr and subnets are calculated with the help of in-built functions.

This module supports three scenarios to create Network resource on AWS. Each will be explained in brief in the corresponding sections.

  • simple-vpc (default behavior): To create a VPC with public subnets and IGW.

    • vpc_cidr = ""
    • enable_public_subnet = true

  • vpc-with-private-sub: To create a VPC with public subnets, private subnets, IGW gateway and NAT gateway.

    • vpc_cidr = ""
    • enable_public_subnet = true
    • enable_private_subnet = true

  • complete-vpc-with-vpn: To create a VPC with public, private, database and intra subnets along with an IGW and NAT gateway. Jump server/Bastion Host is also configured.

    • vpc_cidr = ""
    • enable_public_subnet = true
    • enable_private_subnet = true
    • enable_database_subnet = true
    • enable_intra_subnet = true
    • one_nat_gateway_per_az = true
    • vpn_server_enabled = true
    • vpn_server_instance_type = "t3a.small"
    • vpn_key_pair = ""
    • enable_flow_log = true
    • flow_log_max_aggregation_interval = 60
    • flow_log_cloudwatch_log_group_retention_in_days = 90

IAM Permissions

The required IAM permissions to create resources from this module can be found here

VPN setup-

To configure Pritunl VPN:

  1. Access the Pritunl UI over HTTPS using the public IP of EC2 instance in browser
  2. Retrieve the initial key, user and password for setting up Pritunl from AWS Secrets Manager and log in to Pritunl.
  3. Create a DNS record mapping to the EC2 instance's public IP
  4. After login, in the Initial setup window, add the record created in the 'Lets Encrypt Domain' field.
  5. Pritunl will automatically configure a signed SSL certificate from Lets Encrypt.
  6. Add organization and user to pritunl.
  7. Add server and set port as 10150 which is already allowed from security group while creating instance for VPN server.
  8. Attach organization to the server and Start the server.
  9. Copy or download user profile link or file.
 10. Import the profile in Pritunl client.

NOTE: Port 80 should be open publicly in the vpn security group to verify and renewing the domain certificate.

CIS COMPLIANCE

Security scanning is graciously provided by Prowler. Prowler is the leading fully hosted, cloud-native solution providing continuous cluster security and compliance.

Benchmark Description
Ensure no security groups allow ingress from 0.0.0.0/0 or ::/0 to port 3389 No Security Groups open to 0.0.0.0/0
Ensure the default security group of every VPC restricts all traffic No Default Security Groups open to 0.0.0.0/0

Requirements

Name Version
terraform >= 1.0
aws >= 4.23

Providers

Name Version
aws >= 4.23

Modules

Name Source Version
vpc terraform-aws-modules/vpc/aws 3.14.4
vpn_server ./modules/vpn n/a

Resources

Name Type
aws_ec2_instance_type.arch data source

Inputs

Name Description Type Default Required
azs List of Availability Zone to be used by VPC list(any) n/a yes
database_subnet_cidrs Database Tier subnet CIDRs to be created list(any) [] no
default_network_acl_ingress List of maps of ingress rules to set on the Default Network ACL list(map(string)) 
[
  {
    "action": "deny",
    "cidr_block": "0.0.0.0/0",
    "from_port": 22,
    "protocol": "tcp",
    "rule_no": 98,
    "to_port": 22
  },
  {
    "action": "deny",
    "cidr_block": "0.0.0.0/0",
    "from_port": 3389,
    "protocol": "tcp",
    "rule_no": 99,
    "to_port": 3389
  },
  {
    "action": "allow",
    "cidr_block": "0.0.0.0/0",
    "from_port": 0,
    "protocol": "-1",
    "rule_no": 100,
    "to_port": 0
  },
  {
    "action": "allow",
    "from_port": 0,
    "ipv6_cidr_block": "::/0",
    "protocol": "-1",
    "rule_no": 101,
    "to_port": 0
  }
]
 no
enable_database_subnet Set true to enable database subnets bool false no
enable_flow_log Whether or not to enable VPC Flow Logs bool false no
enable_intra_subnet Set true to enable intra subnets bool false no
enable_private_subnet Set true to enable private subnets bool false no
enable_public_subnet Set true to enable public subnets bool false no
environment Specify the environment indentifier for the VPC string "" no
flow_log_cloudwatch_log_group_retention_in_days Specifies the number of days you want to retain log events in the specified log group for VPC flow logs. number null no
flow_log_max_aggregation_interval The maximum interval of time during which a flow of packets is captured and aggregated into a flow log record. Valid Values: 60 seconds or 600 seconds. number 60 no
intra_subnet_cidrs A list of intra subnets CIDR to be created list(any) [] no
name Specify the name of the VPC string "" no
one_nat_gateway_per_az Set to true if a NAT Gateway is required per availability zone for Private Subnet Tier bool false no
private_subnet_cidrs A list of private subnets CIDR to be created inside the VPC list(any) [] no
public_subnet_cidrs A list of public subnets CIDR to be created inside the VPC list(any) [] no
vpc_cidr The CIDR block of the VPC string "10.0.0.0/16" no
vpn_key_pair Specify the name of AWS Keypair to be used for VPN Server string "" no
vpn_server_enabled Set to true if you want to deploy VPN Gateway resource and attach it to the VPC bool false no
vpn_server_instance_type EC2 instance Type for VPN Server, Only amd64 based instance type are supported eg. t2.medium, t3.micro, c5a.large etc. string "t3a.small" no

Outputs

Name Description
database_subnets List of IDs of database subnets
intra_subnets List of IDs of Intra subnets
private_subnets List of IDs of private subnets
public_subnets List of IDs of public subnets
vpc_cidr_block IPV4 CIDR Block for this VPC
vpc_id The ID of the VPC
vpn_host_public_ip IP Address of VPN Server
vpn_security_group Security Group ID of VPN Server

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License

Apache License, Version 2.0, January 2004 (https://www.apache.org/licenses/LICENSE-2.0)

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