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nacl.tf
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nacl.tf
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# --------------------------------------------------------------------------------
# public subnet NACL
# --------------------------------------------------------------------------------
resource "aws_network_acl" "public" {
vpc_id = aws_vpc.main.id
subnet_ids = toset(aws_subnet.public.*.id)
tags = merge({ "Name" = "${var.vpc_name} Public" }, var.tags)
}
resource "aws_network_acl_rule" "public_ssh_in" {
count = length(var.ssh_inbound)
network_acl_id = aws_network_acl.public.id
rule_number = 100 + count.index
egress = false
protocol = "tcp"
rule_action = "allow"
cidr_block = var.ssh_inbound[count.index]
from_port = 22
to_port = 22
}
resource "aws_network_acl_rule" "public_http_in" {
network_acl_id = aws_network_acl.public.id
rule_number = 200
egress = false
protocol = "tcp"
rule_action = "allow"
cidr_block = "0.0.0.0/0"
from_port = 80
to_port = 80
}
resource "aws_network_acl_rule" "public_https_in" {
network_acl_id = aws_network_acl.public.id
rule_number = 210
egress = false
protocol = "tcp"
rule_action = "allow"
cidr_block = "0.0.0.0/0"
from_port = 443
to_port = 443
}
resource "aws_network_acl_rule" "public_ephemeral_in" {
network_acl_id = aws_network_acl.public.id
rule_number = 300
egress = false
protocol = "tcp"
rule_action = "allow"
cidr_block = "0.0.0.0/0"
from_port = 1024
to_port = 65535
}
resource "aws_network_acl_rule" "public_http_out" {
network_acl_id = aws_network_acl.public.id
rule_number = 200
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" "public_https_out" {
network_acl_id = aws_network_acl.public.id
rule_number = 210
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" "public_ephemeral_out" {
network_acl_id = aws_network_acl.public.id
rule_number = 300
egress = true
protocol = "tcp"
rule_action = "allow"
cidr_block = "0.0.0.0/0"
from_port = 1024
to_port = 65535
}
# --------------------------------------------------------------------------------
# private subnet NACL
# --------------------------------------------------------------------------------
# we still route 80 & 443 (and ephemeral return routes) out, to allow use of yum etc
# from inside the private subnet, however only allow 80 & 443 incomding from the public subnets
# remeber though that non-local traffic from the 'private' subnets routes through the NAT
# gateway, providing anonymity of the instances from outside
resource "aws_network_acl" "private" {
vpc_id = aws_vpc.main.id
subnet_ids = toset(aws_subnet.private.*.id)
tags = merge({ "Name" = "${var.vpc_name} Private" }, var.tags)
}
resource "aws_network_acl_rule" "private_http_in" {
count = local.subnet_count
network_acl_id = aws_network_acl.private.id
rule_number = 200 + count.index
egress = false
protocol = "tcp"
rule_action = "allow"
cidr_block = element(aws_subnet.public.*.cidr_block, count.index)
from_port = 80
to_port = 80
}
resource "aws_network_acl_rule" "private_https_in" {
count = local.subnet_count
network_acl_id = aws_network_acl.private.id
rule_number = 300 + count.index
egress = false
protocol = "tcp"
rule_action = "allow"
cidr_block = element(aws_subnet.public.*.cidr_block, count.index)
from_port = 443
to_port = 443
}
resource "aws_network_acl_rule" "private_ephemeral_in" {
network_acl_id = aws_network_acl.private.id
rule_number = 400
egress = false
protocol = "tcp"
rule_action = "allow"
cidr_block = "0.0.0.0/0"
from_port = 1024
to_port = 65535
}
resource "aws_network_acl_rule" "private_https_out" {
network_acl_id = aws_network_acl.private.id
rule_number = 300
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_ephemeral_out_private" {
count = local.subnet_count
network_acl_id = aws_network_acl.private.id
rule_number = 330 + count.index
egress = true
protocol = "tcp"
rule_action = "allow"
cidr_block = element(aws_subnet.private.*.cidr_block, count.index)
from_port = 1024
to_port = 65535
}
resource "aws_network_acl_rule" "private_ephemeral_out" {
count = local.subnet_count
network_acl_id = aws_network_acl.private.id
rule_number = 400 + count.index
egress = true
protocol = "tcp"
rule_action = "allow"
cidr_block = element(aws_subnet.public.*.cidr_block, count.index)
from_port = 1024
to_port = 65535
}