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main.tf
137 lines (120 loc) · 4.3 KB
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main.tf
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locals {
# Following docs can be referred to calculate capacity required for each rule
# https://docs.aws.amazon.com/cli/latest/reference/wafv2/check-capacity.html
# https://docs.aws.amazon.com/waf/latest/APIReference/API_CheckCapacity.html#API_CheckCapacity_RequestParameters
rule_group_capacity = sum(flatten(
[
# https://docs.aws.amazon.com/waf/latest/developerguide/waf-rule-statement-type-geo-match.html
lookup(var.block_sanctioned_countries, "enabled", false) ? [1] : [0],
# https://docs.aws.amazon.com/waf/latest/developerguide/waf-rule-statement-type-string-match.html
# https://docs.aws.amazon.com/waf/latest/developerguide/waf-rule-statement-transformation.html
# 2 for ENDS_WITH constraint and 10 for text transformations
lookup(var.block_cloudfront_default_domain, "enabled", false) ? [12] : [0],
# https://docs.aws.amazon.com/waf/latest/developerguide/waf-rule-statement-type-string-match.html
# https://docs.aws.amazon.com/waf/latest/developerguide/waf-rule-statement-transformation.html
# 2 for ENDS_WITH constraint and 10 for text transformations
lookup(var.block_load_balancer_default_domain, "enabled", false) ? [12] : [0]
])
)
}
resource "aws_wafv2_rule_group" "this" {
name = var.name
description = var.description
scope = var.scope
capacity = local.rule_group_capacity
dynamic "rule" {
for_each = lookup(var.block_sanctioned_countries, "enabled", false) ? [0] : []
content {
name = "block-sanctioned-countries"
priority = var.block_sanctioned_countries["priority"]
action {
block {}
}
statement {
geo_match_statement {
country_codes = var.block_sanctioned_countries["countries_code"]
}
}
dynamic "visibility_config" {
for_each = var.block_sanctioned_countries["enable_cw_metrics"] ? [0] : []
content {
cloudwatch_metrics_enabled = true
metric_name = "${var.name}-block-sanctioned-countries-rule-waf"
sampled_requests_enabled = true
}
}
}
}
dynamic "rule" {
for_each = lookup(var.block_cloudfront_default_domain, "enabled", false) ? [0] : []
content {
name = "block-cloudfront-default-domain"
priority = var.block_cloudfront_default_domain["priority"]
action {
block {}
}
statement {
byte_match_statement {
field_to_match {
single_header {
name = "host"
}
}
positional_constraint = "ENDS_WITH"
search_string = ".cloudfront.net"
text_transformation {
type = "LOWERCASE"
priority = 0
}
}
}
dynamic "visibility_config" {
for_each = var.block_cloudfront_default_domain["enable_cw_metrics"] ? [0] : []
content {
cloudwatch_metrics_enabled = true
metric_name = "${var.name}-block-cloudfront-default-domain-rule-waf"
sampled_requests_enabled = true
}
}
}
}
dynamic "rule" {
for_each = lookup(var.block_load_balancer_default_domain, "enabled", false) ? [0] : []
content {
name = "block-load-balancer-default-domain"
priority = var.block_load_balancer_default_domain["priority"]
action {
block {}
}
statement {
byte_match_statement {
field_to_match {
single_header {
name = "host"
}
}
positional_constraint = "ENDS_WITH"
search_string = ".elb.amazonaws.com"
text_transformation {
type = "LOWERCASE"
priority = 0
}
}
}
dynamic "visibility_config" {
for_each = var.block_load_balancer_default_domain["enable_cw_metrics"] ? [0] : []
content {
cloudwatch_metrics_enabled = true
metric_name = "${var.name}-block-load-balancer-default-domain-rule-waf"
sampled_requests_enabled = true
}
}
}
}
visibility_config {
cloudwatch_metrics_enabled = var.enable_cw_metrics
metric_name = "${var.name}-waf-rule-group"
sampled_requests_enabled = var.enable_cw_metrics
}
tags = var.tags
}