»Security Groups

You can configure security group settings to open the virtual firewall between your HVN and your AWS cloud network.

»Overview

A security group is an entity in AWS that functions as a virtual firewall between your AWS instances. Security groups manage protocol and port permissions for AWS traffic in order to control inbound and outbound traffic. For additional information, refer to the AWS documentation Control traffic to resources using security groups.

To establish communication between your HashiCorp Virtual Network (HVN) and your Amazon VPC or Amazon transit gateway, you must:

Create a security group.
Configure ingress (inbound) rules.
Configure egress (outbound) rules.

To configure security group rules, you can use either the AWS console or the AWS Command Line Interface.

Tip: Creating custom security group configurations for your HCP products improves infrastructure security. However, administrative flexibility may reduce over time as you introduce multiple service deployments.

»Security Group Rules for HCP Consul

To allow traffic between your Consul cluster and AWS, specify ingress (inbound) and egress (outbound) rules on your Amazon VPC or Amazon transit gateway.

»Ingress

To allow inbound traffic from your HVN, specify the following rules on your Amazon VPC or Amazon transit gateway:

Protocol	From Port	To Port	Source	Description
TCP	8301	8301	HVN-CIDR	Used to handle gossip from server
UDP	8301	8301	HVN-CIDR	Used to handle gossip from server
TCP	8301	8301	Security group ID itself	Used to handle gossip between client agents
UDP	8301	8301	Security group ID itself	Used to handle gossip between client agents

To apply the ingress rules to your security group, you can issue the authorize-security-group-ingress command. Specify the following information in the command:

Target VPC region
Security group ID
CIDR block configured for your HVN

$ aws ec2 --region <TARGET-VPC-REGION> \
   authorize-security-group-ingress --<SECURITY GROUP ID> --ip-permissions \
   IpProtocol=tcp,FromPort=8301,ToPort=8301,IpRanges='[{CidrIp=<HVN-CIDR>}]' \
   IpProtocol=udp,FromPort=8301,ToPort=8301,IpRanges='[{CidrIp=<HVN-CIDR>}]' \
   IpProtocol=tcp,FromPort=8301,ToPort=8301,UserIdGroupPairs='[{GroupId=<SECURITY-GROUP-ID>}]' \
   IpProtocol=udp,FromPort=8301,ToPort=8301,UserIdGroupPairs='[{GroupId=<SECURITY-GROUP-ID>}]'

$ aws ec2 --region <TARGET-VPC-REGION> \
   authorize-security-group-ingress --<SECURITY GROUP ID> --ip-permissions \
   IpProtocol=tcp,FromPort=8301,ToPort=8301,IpRanges='[{CidrIp=<HVN-CIDR>}]' \
   IpProtocol=udp,FromPort=8301,ToPort=8301,IpRanges='[{CidrIp=<HVN-CIDR>}]' \
   IpProtocol=tcp,FromPort=8301,ToPort=8301,UserIdGroupPairs='[{GroupId=<SECURITY-GROUP-ID>}]' \
   IpProtocol=udp,FromPort=8301,ToPort=8301,UserIdGroupPairs='[{GroupId=<SECURITY-GROUP-ID>}]'

»Egress

To allow outbound traffic from your VPC, specify the following rules on your Amazon VPC or Amazon transit gateway:

Protocol	From Port	To Port	Destination	Description
TCP	8300	8300	HVN-CIDR	For RPC communication between clients and servers
TCP	8301	8301	HVN-CIDR	Used to gossip with server
UDP	8301	8301	HVN-CIDR	Used to gossip with server
TCP	8301	8301	Security group ID itself	Used to handle gossip between client agents
UDP	8301	8301	Security group ID itself	Used to handle gossip between client agents
TCP	80	80	HVN-CIDR	Consul API
TCP	443	443	HVN-CIDR	Consul API

To apply the egress rules to the security group, you can issue the authorize-security-group-egress command. Specify the following information in the command:

Target VPC region
Security group ID
CIDR block configured for your HVN

$ aws ec2 --region <TARGET-VPC-REGION> \
   authorize-security-group-egress --<SECURITY GROUP ID> --ip-permissions \
   IpProtocol=tcp,FromPort=8300,ToPort=8300,IpRanges='[{CidrIp=<HVN-CIDR>}]' \
   IpProtocol=tcp,FromPort=8301,ToPort=8301,IpRanges='[{CidrIp=<HVN-CIDR>}]' \
   IpProtocol=udp,FromPort=8301,ToPort=8301,IpRanges='[{CidrIp=<HVN-CIDR>}]' \
   IpProtocol=tcp,FromPort=8301,ToPort=8301,UserIdGroupPairs='[{GroupId=<SECURITY-GROUP-ID>}]' \
   IpProtocol=udp,FromPort=8301,ToPort=8301,UserIdGroupPairs='[{GroupId=<SECURITY-GROUP-ID>}]' \
   IpProtocol=tcp,FromPort=80,ToPort=80,IpRanges='[{CidrIp=<HVN-CIDR>}]' \
   IpProtocol=tcp,FromPort=443,ToPort=443,IpRanges='[{CidrIp=<HVN-CIDR>}]'

$ aws ec2 --region <TARGET-VPC-REGION> \
   authorize-security-group-egress --<SECURITY GROUP ID> --ip-permissions \
   IpProtocol=tcp,FromPort=8300,ToPort=8300,IpRanges='[{CidrIp=<HVN-CIDR>}]' \
   IpProtocol=tcp,FromPort=8301,ToPort=8301,IpRanges='[{CidrIp=<HVN-CIDR>}]' \
   IpProtocol=udp,FromPort=8301,ToPort=8301,IpRanges='[{CidrIp=<HVN-CIDR>}]' \
   IpProtocol=tcp,FromPort=8301,ToPort=8301,UserIdGroupPairs='[{GroupId=<SECURITY-GROUP-ID>}]' \
   IpProtocol=udp,FromPort=8301,ToPort=8301,UserIdGroupPairs='[{GroupId=<SECURITY-GROUP-ID>}]' \
   IpProtocol=tcp,FromPort=80,ToPort=80,IpRanges='[{CidrIp=<HVN-CIDR>}]' \
   IpProtocol=tcp,FromPort=443,ToPort=443,IpRanges='[{CidrIp=<HVN-CIDR>}]'

»Security Group Rules for HCP Vault

To allow traffic between your Vault cluster and AWS, specify egress (outbound) rules on your Amazon VPC or Amazon transit gateway. Ingress rules are not required to allow traffic from Vault clusters into your VPC or transit gateway.

»Egress

To allow outbound traffic from your VPC, add the following rules to your security group for HCP Vault:

Protocol	From Port	To Port	Destination	Purpose
TCP	8200	8200	HVN-CIDR	Vault API

To apply this configuration to your security group, run the authorize-security-group-egress command. When you issue the command, you must specify the target VPC region and security group ID.

$ aws ec2 --region <TARGET-VPC-REGION> \
   authorize-security-group-egress \
   --<SECURITY-GROUP-ID> \
   --ip-permissions \
   IpProtocol=tcp,FromPort=8200,ToPort=8200,IpRanges='[{CidrIp=172.25.16.0/20}]'

$ aws ec2 --region <TARGET-VPC-REGION> \
   authorize-security-group-egress \
   --<SECURITY-GROUP-ID> \
   --ip-permissions \
   IpProtocol=tcp,FromPort=8200,ToPort=8200,IpRanges='[{CidrIp=172.25.16.0/20}]'