/
vpc-security-groups.tf
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/
vpc-security-groups.tf
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# Security Groups (SG)
## Load Balancer SG
resource "aws_security_group" "load_balancer" {
name_prefix = "${var.main_project_tag}-alb-sg"
description = "Firewall for the application load balancer fronting the vault instances."
vpc_id = aws_vpc.vault.id
tags = merge(
{ "Name" = "${var.main_project_tag}-alb-sg" },
{ "Project" = var.main_project_tag }
)
}
resource "aws_security_group_rule" "load_balancer_allow_80" {
security_group_id = aws_security_group.load_balancer.id
type = "ingress"
protocol = "tcp"
from_port = 80
to_port = 80
cidr_blocks = var.allowed_traffic_cidr_blocks
ipv6_cidr_blocks = length(var.allowed_traffic_cidr_blocks_ipv6) > 0 ? var.allowed_traffic_cidr_blocks_ipv6 : null
description = "Allow HTTP traffic."
}
resource "aws_security_group_rule" "load_balancer_allow_443" {
security_group_id = aws_security_group.load_balancer.id
type = "ingress"
protocol = "tcp"
from_port = 443
to_port = 443
cidr_blocks = var.allowed_traffic_cidr_blocks
ipv6_cidr_blocks = length(var.allowed_traffic_cidr_blocks_ipv6) > 0 ? var.allowed_traffic_cidr_blocks_ipv6 : null
description = "Allow HTTPS traffic."
}
## Only the Load Balancer is set up to work with IPv6. Once a request
## comes in, it all goes through IPv4 internally.
resource "aws_security_group_rule" "load_balancer_allow_outbound" {
security_group_id = aws_security_group.load_balancer.id
type = "egress"
protocol = "-1"
from_port = 0
to_port = 0
cidr_blocks = ["0.0.0.0/0"]
ipv6_cidr_blocks = length(var.allowed_traffic_cidr_blocks_ipv6) > 0 ? ["::/0"] : null
description = "Allow any outbound traffic."
}
## Vault Instance SG
resource "aws_security_group" "vault_instance" {
name_prefix = "${var.main_project_tag}-vault-instance-sg"
description = "Firewall for the vault instances."
vpc_id = aws_vpc.vault.id
tags = merge(
{ "Name" = "${var.main_project_tag}-vault-instance-sg" },
{ "Project" = var.main_project_tag }
)
}
resource "aws_security_group_rule" "vault_instance_allow_8200" {
security_group_id = aws_security_group.vault_instance.id
type = "ingress"
protocol = "tcp"
from_port = 8200
to_port = 8200
source_security_group_id = aws_security_group.load_balancer.id
description = "Allow traffic from Load Balancer."
}
resource "aws_security_group_rule" "vault_instance_allow_8201" {
security_group_id = aws_security_group.vault_instance.id
type = "ingress"
protocol = "tcp"
from_port = 8201
to_port = 8201
self = true
description = "Allow traffic from fellow vault instances that have this SG."
}
resource "aws_security_group_rule" "vault_instance_allow_22_bastion" {
security_group_id = aws_security_group.vault_instance.id
type = "ingress"
protocol = "tcp"
from_port = 22
to_port = 22
source_security_group_id = aws_security_group.bastion.id
description = "Allow SSH traffic from vault bastion."
}
resource "aws_security_group_rule" "vault_instance_allow_outbound" {
security_group_id = aws_security_group.vault_instance.id
type = "egress"
protocol = "-1"
from_port = 0
to_port = 0
cidr_blocks = ["0.0.0.0/0"]
description = "Allow any outbound traffic."
}
## Bastion SG
resource "aws_security_group" "bastion" {
name_prefix = "${var.main_project_tag}-bastion-sg"
description = "Firewall for the operator bastion instance"
vpc_id = aws_vpc.vault.id
tags = merge(
{ "Name" = "${var.main_project_tag}-bastion-sg" },
{ "Project" = var.main_project_tag }
)
}
resource "aws_security_group_rule" "bastion_allow_22" {
security_group_id = aws_security_group.bastion.id
type = "ingress"
protocol = "tcp"
from_port = 22
to_port = 22
cidr_blocks = var.allowed_bastion_cidr_blocks
ipv6_cidr_blocks = length(var.allowed_bastion_cidr_blocks_ipv6) > 0 ? var.allowed_bastion_cidr_blocks_ipv6 : null
description = "Allow SSH traffic."
}
resource "aws_security_group_rule" "bastion_allow_outbound" {
security_group_id = aws_security_group.bastion.id
type = "egress"
protocol = "-1"
from_port = 0
to_port = 0
cidr_blocks = ["0.0.0.0/0"]
ipv6_cidr_blocks = length(var.allowed_bastion_cidr_blocks_ipv6) > 0 ? ["::/0"] : null
description = "Allow any outbound traffic."
}
## KMS Endpoint SG
resource "aws_security_group" "kms_endpoint" {
name_prefix = "${var.main_project_tag}-kms-endpoint-sg"
description = "Firewall for the KMS Endpoint."
vpc_id = aws_vpc.vault.id
tags = merge(
{ "Name" = "${var.main_project_tag}-kms-endpoint-sg" },
{ "Project" = var.main_project_tag }
)
}
resource "aws_security_group_rule" "vault_instance_allow_80" {
security_group_id = aws_security_group.kms_endpoint.id
type = "ingress"
protocol = "tcp"
from_port = 80
to_port = 80
source_security_group_id = aws_security_group.vault_instance.id
description = "Allow HTTP traffic from vault instances."
}
resource "aws_security_group_rule" "vault_instance_allow_443" {
security_group_id = aws_security_group.kms_endpoint.id
type = "ingress"
protocol = "tcp"
from_port = 443
to_port = 443
source_security_group_id = aws_security_group.vault_instance.id
description = "Allow HTTPS traffic from vault instances."
}
resource "aws_security_group_rule" "kms_allow_outbound" {
security_group_id = aws_security_group.kms_endpoint.id
type = "egress"
protocol = "-1"
from_port = 0
to_port = 0
cidr_blocks = ["0.0.0.0/0"]
description = "Allow any outbound traffic."
}