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subnet_private_egress.tf
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resource "aws_subnet" "private-egress" {
count = local.az_count
vpc_id = aws_vpc.main.id
cidr_block = local.private-egress-cidr[count.index]
availability_zone = local.az_name[count.index]
tags = merge(
local.tags,
{
Name = "${local.az_name[count.index]}-private-egress-${local.name}"
}
)
}
// No NAT
resource "aws_route_table" "private-egress-none" {
count = var.nat_type == "none" ? local.az_count : 0
vpc_id = aws_vpc.main.id
tags = merge(
local.tags,
{
Name = "private-egress-${local.name}-${local.az_name[count.index]}"
}
)
}
resource "aws_route_table_association" "private-egress-none" {
count = var.nat_type == "none" ? local.az_count : 0
subnet_id = aws_subnet.private-egress[count.index].id
route_table_id = aws_route_table.private-egress-none[count.index].id
}
// NAT Gateway
resource "aws_route_table" "private-egress-gateway" {
count = var.nat_type == "gateway" ? local.az_count : 0
vpc_id = aws_vpc.main.id
route {
cidr_block = "0.0.0.0/0"
nat_gateway_id = aws_nat_gateway.public-egress[count.index].id
}
route {
ipv6_cidr_block = "::/0"
egress_only_gateway_id = aws_egress_only_internet_gateway.main.id
}
dynamic "route" {
for_each = aws_vpc_endpoint.main
content {
vpc_endpoint_id = route.value.id
}
}
tags = merge(
local.tags,
{
Name = "private-egress-${local.az_name[count.index]}-${local.name}"
}
)
}
resource "aws_route_table_association" "private-gateway" {
count = var.nat_type == "gateway" ? local.az_count : 0
subnet_id = aws_subnet.private[count.index].id
route_table_id = aws_route_table.private-egress-gateway[count.index].id
}
// NAT Instance
resource "aws_route_table" "private-egress-instance" {
count = var.nat_type == "instance" ? local.az_count : 0
vpc_id = aws_vpc.main.id
route {
cidr_block = "0.0.0.0/0"
gateway_id = aws_internet_gateway.main.id
}
tags = merge(
local.tags,
{
Name = "private-egress-${local.az_name[count.index]}-${local.name}"
}
)
}
resource "aws_route_table_association" "private-instance" {
count = var.nat_type == "instance" ? local.az_count : 0
subnet_id = aws_subnet.private[count.index].id
route_table_id = aws_route_table.private-egress-instance[count.index].id
}
# ACL
resource "aws_network_acl" "private-egress" {
vpc_id = aws_vpc.main.id
subnet_ids = aws_subnet.private-egress.*.id
tags = merge(
local.tags,
{
Name = "private-egress-${local.name}"
}
)
}
# HTTP Internal Requests
resource "aws_network_acl_rule" "private-egress_egress_http_public_ipv4" {
network_acl_id = aws_network_acl.private-egress.id
rule_number = 4080
egress = true
protocol = "tcp"
rule_action = "allow"
cidr_block = "0.0.0.0/0"
from_port = 80
to_port = 80
}
resource "aws_network_acl_rule" "private-egress_egress_http_public_ipv6" {
network_acl_id = aws_network_acl.private-egress.id
rule_number = 6080
egress = true
protocol = "tcp"
rule_action = "allow"
ipv6_cidr_block = "::/0"
from_port = 80
to_port = 80
}
# HTTPS Internal Requests
resource "aws_network_acl_rule" "private-egress_egress-https-public-ipv4" {
network_acl_id = aws_network_acl.private-egress.id
rule_number = 4443
egress = true
protocol = "tcp"
rule_action = "allow"
cidr_block = "0.0.0.0/0"
from_port = 443
to_port = 443
}
resource "aws_network_acl_rule" "private-egress_egress-https-public-ipv6" {
network_acl_id = aws_network_acl.private-egress.id
rule_number = 6443
egress = true
protocol = "tcp"
rule_action = "allow"
ipv6_cidr_block = "::/0"
from_port = 443
to_port = 443
}
# Ephemeral Ports for Internal Requests
#tfsec:ignore:aws-vpc-no-public-ingress-acl
resource "aws_network_acl_rule" "private-egress_ingress-ephemeral-public-ipv4" {
network_acl_id = aws_network_acl.private-egress.id
rule_number = 4999
egress = false
protocol = "tcp"
rule_action = "allow"
cidr_block = "0.0.0.0/0"
from_port = 1024
to_port = 65535
}
#tfsec:ignore:aws-vpc-no-public-ingress-acl
resource "aws_network_acl_rule" "private-egress_ingress-ephemeral-public-ipv6" {
network_acl_id = aws_network_acl.private-egress.id
rule_number = 6999
egress = false
protocol = "tcp"
rule_action = "allow"
ipv6_cidr_block = "::/0"
from_port = 1024
to_port = 65535
}