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main.tf
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main.tf
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module "vpc" {
count = var.vpc_name == null ? 0 : 1
source = "a3linux/tagged-vpc/aws"
vpc_name = var.vpc_name
tags = var.vpc_tags
}
module "port_service" {
source = "a3linux/portservicemapping/null"
port_service_mappings = var.port_service_mappings
}
module "whitelist" {
count = var.whitelist_file == null ? 0 : 1
source = "a3linux/ipwhitelist/null"
whitelist_file = var.whitelist_file
source_services = var.allowed_sources
env = module.context.env
}
module "eg_port_service" {
source = "a3linux/portservicemapping/null"
port_service_mappings = var.eg_port_service_mappings
}
module "eg_whitelist" {
count = var.whitelist_file == null ? 0 : 1
source = "a3linux/ipwhitelist/null"
whitelist_file = var.whitelist_file
source_services = var.eg_allowed_sources
env = module.context.env
}
data "aws_security_groups" "named_security_groups" {
count = length(var.security_group_names) > 0 ? 1 : 0
filter {
name = "group-name"
values = var.security_group_names
}
filter {
name = "vpc-id"
values = [local.vpc_id]
}
}
data "aws_security_groups" "eg_named_security_groups" {
count = length(var.eg_security_group_names) > 0 ? 1 : 0
filter {
name = "group-name"
values = var.eg_security_group_names
}
filter {
name = "vpc-id"
values = [local.vpc_id]
}
}
locals {
sg_existing = var.is_external == true
id = var.is_external ? join("", data.aws_security_group.existing.*.id) : join("", aws_security_group.default.*.id)
arn = var.is_external ? join("", data.aws_security_group.existing.*.arn) : join("", aws_security_group.default.*.arn)
egress_rule = var.egress_rule == true
generated_name = format("%s-sg", substr(md5(uuid()), 0, 8))
failover_name = module.context.id == "" ? local.generated_name : module.context.id
name = var.name != null ? var.name : local.failover_name
tags = module.context.tags
vpc_id = var.vpc_id == null ? module.vpc[0].vpc_id : var.vpc_id
enable_cidr_rules = length(var.allowed_ips) + length(var.allowed_sources) > 0
enable_self_rules = var.enable_self && length(var.allowed_services) > 0
enable_cidr_rules_ipv6 = length(var.allowed_ipv6) > 0
security_groups = length(var.security_group_names) > 0 ? concat(var.security_groups, data.aws_security_groups.named_security_groups[0].ids) : var.security_groups
enable_source_sec_group_rules = length(local.security_groups) == 0 ? false : true
enable_source_prefix_list_ids = length(var.prefix_list_ids) == 0 ? false : true
eg_security_groups = length(var.eg_security_group_names) > 0 ? concat(var.eg_security_groups, data.aws_security_groups.eg_named_security_groups[0].ids) : var.eg_security_groups
#egress local parameters
enable_source_sec_group_rules_eg = length(local.eg_security_groups) == 0 && length(var.eg_security_group_names) == 0 ? false : true
enable_source_prefix_list_ids_eg = length(var.eg_prefix_list_ids) == 0 ? false : true
enable_cidr_rules_ipv6_eg = length(var.eg_allowed_ipv6) > 0
allowed_ips = var.whitelist_file == null ? var.allowed_ips : concat(module.whitelist[0].cidr_blocks, var.allowed_ips)
allowed_services = [for s in var.allowed_services : lookup(module.port_service.port_service_mappings, s)]
eg_allowed_ips = var.whitelist_file == null ? var.eg_allowed_ips : concat(module.eg_whitelist[0].cidr_blocks, var.eg_allowed_ips)
eg_allowed_services = [for s in var.eg_allowed_services : lookup(module.eg_port_service.port_service_mappings, s)]
ports_source_sec_group_product = setproduct(local.allowed_services, length(local.security_groups) > 0 ? local.security_groups : [""])
ports_source_prefix_product = setproduct(local.allowed_services, length(var.prefix_list_ids) > 0 ? var.prefix_list_ids : [""])
ports_source_sec_group_product_eg = setproduct(local.eg_allowed_services, length(local.eg_security_groups) > 0 ? local.eg_security_groups : [""])
ports_source_prefix_product_eg = setproduct(local.eg_allowed_services, length(var.eg_prefix_list_ids) > 0 ? var.eg_prefix_list_ids : [""])
}
# security group
resource "aws_security_group" "default" {
count = local.sg_existing ? 0 : 1
name = local.name
vpc_id = local.vpc_id
description = var.description
tags = local.tags
lifecycle {
create_before_destroy = true
}
}
# Manage existed security group
data "aws_security_group" "existing" {
count = local.sg_existing ? 1 : 0
id = var.existing_sg_id
vpc_id = local.vpc_id
}
#Module : SECURITY GROUP RULE FOR EGRESS
#Description : Provides a security group rule resource. Represents a single egress
# group rule, which can be added to external Security Groups.
resource "aws_security_group_rule" "egress" {
count = (local.sg_existing == false && local.egress_rule == false) ? 1 : 0
type = "egress"
from_port = 0
to_port = 65535
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
security_group_id = local.id
}
resource "aws_security_group_rule" "egress_ipv6" {
count = local.sg_existing == false && local.egress_rule == false ? 1 : 0
type = "egress"
from_port = 0
to_port = 65535
protocol = "-1"
ipv6_cidr_blocks = ["::/0"]
security_group_id = local.id
}
#Module : SECURITY GROUP RULE FOR INGRESS
#Description : Provides a security group rule resource. Represents a single ingress
# group rule, which can be added to external Security Groups.
resource "aws_security_group_rule" "ingress" {
count = local.enable_cidr_rules == true ? length(local.allowed_services) : 0
type = "ingress"
from_port = element(local.allowed_services, count.index)[0]
to_port = element(local.allowed_services, count.index)[1]
protocol = element(local.allowed_services, count.index)[2]
cidr_blocks = local.allowed_ips
security_group_id = local.id
}
resource "aws_security_group_rule" "ingress_self" {
count = local.enable_self_rules == true ? length(local.allowed_services) : 0
type = "ingress"
from_port = element(local.allowed_services, count.index)[0]
to_port = element(local.allowed_services, count.index)[1]
protocol = element(local.allowed_services, count.index)[2]
security_group_id = local.id
self = true
}
resource "aws_security_group_rule" "ingress_ipv6" {
count = local.enable_cidr_rules_ipv6 == true ? length(local.allowed_services) : 0
type = "ingress"
from_port = element(local.allowed_services, count.index)[0]
to_port = element(local.allowed_services, count.index)[1]
protocol = element(local.allowed_services, count.index)[2]
ipv6_cidr_blocks = var.allowed_ipv6
security_group_id = local.id
}
resource "aws_security_group_rule" "ingress_sg" {
count = local.enable_source_sec_group_rules == true ? length(local.ports_source_sec_group_product) : 0
type = "ingress"
from_port = element(element(element(local.ports_source_sec_group_product, count.index), 0), 0)
to_port = element(element(element(local.ports_source_sec_group_product, count.index), 0), 1)
protocol = element(element(element(local.ports_source_sec_group_product, count.index), 0), 2)
source_security_group_id = local.enable_source_sec_group_rules == true ? element(element(local.ports_source_sec_group_product, count.index), 1) : 0
security_group_id = local.id
}
resource "aws_security_group_rule" "ingress_prefix" {
count = local.enable_source_prefix_list_ids == true ? length(local.ports_source_prefix_product) : 0
type = "ingress"
from_port = element(element(local.ports_source_prefix_product, count.index), 0)[0]
to_port = element(element(local.ports_source_prefix_product, count.index), 0)[1]
protocol = element(element(local.ports_source_prefix_product, count.index), 0)[2]
prefix_list_ids = [element(element(local.ports_source_prefix_product, count.index), 1)]
security_group_id = local.id
}
#egress rules configuration
resource "aws_security_group_rule" "egress_ipv4_rule" {
count = local.egress_rule == true ? length(local.eg_allowed_services) : 0
type = "egress"
from_port = element(local.eg_allowed_services, count.index)[0]
to_port = element(local.eg_allowed_services, count.index)[1]
protocol = element(local.eg_allowed_services, count.index)[2]
cidr_blocks = local.eg_allowed_ips
security_group_id = local.id
}
resource "aws_security_group_rule" "egress_ipv6_rule" {
count = local.egress_rule == true && local.enable_cidr_rules_ipv6_eg == true ? length(local.eg_allowed_services) : 0
type = "egress"
from_port = element(local.eg_allowed_services, count.index)[0]
to_port = element(local.eg_allowed_services, count.index)[1]
protocol = element(local.eg_allowed_services, count.index)[2]
ipv6_cidr_blocks = var.eg_allowed_ipv6
security_group_id = local.id
}
resource "aws_security_group_rule" "egress_sg_rule" {
count = local.egress_rule == true && local.enable_source_sec_group_rules_eg == true ? length(local.ports_source_sec_group_product_eg) : 0
type = "egress"
from_port = element(element(local.ports_source_sec_group_product_eg, count.index), 0)[0]
to_port = element(element(local.ports_source_sec_group_product_eg, count.index), 0)[1]
protocol = element(element(local.ports_source_sec_group_product_eg, count.index), 0)[2]
source_security_group_id = element(element(local.ports_source_sec_group_product_eg, count.index), 1)
security_group_id = local.id
}
resource "aws_security_group_rule" "egress_prefix_rule" {
count = local.egress_rule == true && local.enable_source_prefix_list_ids_eg == true ? length(local.ports_source_prefix_product_eg) : 0
type = "egress"
from_port = element(element(local.ports_source_prefix_product_eg, count.index), 0)[0]
to_port = element(element(local.ports_source_prefix_product_eg, count.index), 0)[1]
protocol = element(element(local.ports_source_prefix_product_eg, count.index), 0)[2]
prefix_list_ids = [element(element(local.ports_source_prefix_product_eg, count.index), 1)]
security_group_id = local.id
}