Set custom CDN waf rules (#655)

* this will be used for specific cases where we want requests to bypass the rate limit policy

terraform/README.md

@@ -164,6 +164,7 @@ No resources.
 | <a name="input_cdn_frontdoor_origin_host_header_override"></a> [cdn\_frontdoor\_origin\_host\_header\_override](#input\_cdn\_frontdoor\_origin\_host\_header\_override) | Manually specify the host header that the CDN sends to the target. Defaults to the recieved host header. Set to null to set it to the host\_name (`cdn_frontdoor_origin_fqdn_override`) | `string` | `""` | no |
 | <a name="input_cdn_frontdoor_rate_limiting_duration_in_minutes"></a> [cdn\_frontdoor\_rate\_limiting\_duration\_in\_minutes](#input\_cdn\_frontdoor\_rate\_limiting\_duration\_in\_minutes) | CDN Front Door rate limiting duration in minutes | `number` | `5` | no |
 | <a name="input_cdn_frontdoor_rate_limiting_threshold"></a> [cdn\_frontdoor\_rate\_limiting\_threshold](#input\_cdn\_frontdoor\_rate\_limiting\_threshold) | Maximum number of concurrent requests per minute threshold before rate limiting is applied | `number` | n/a | yes |
+| <a name="input_cdn_frontdoor_waf_custom_rules"></a> [cdn\_frontdoor\_waf\_custom\_rules](#input\_cdn\_frontdoor\_waf\_custom\_rules) | Map of all Custom rules you want to apply to the CDN WAF | <pre>map(object({<br>    priority : number,<br>    action : string<br>    match_conditions : map(object({<br>      match_variable : string,<br>      match_values : optional(list(string), []),<br>      operator : optional(string, "Any"),<br>      selector : optional(string, null),<br>      negation_condition : optional(bool, false),<br>    }))<br>  }))</pre> | `{}` | no |
 | <a name="input_container_app_file_share_mount_path"></a> [container\_app\_file\_share\_mount\_path](#input\_container\_app\_file\_share\_mount\_path) | A path inside your container where the File Share will be mounted to | `string` | `"/srv/app/storage"` | no |
 | <a name="input_container_apps_allow_ips_inbound"></a> [container\_apps\_allow\_ips\_inbound](#input\_container\_apps\_allow\_ips\_inbound) | Restricts access to the Container Apps by creating a network security group rule that only allow inbound traffic from the provided list of IPs | `list(string)` | `[]` | no |
 | <a name="input_container_command"></a> [container\_command](#input\_container\_command) | Container command | `list(any)` | n/a | yes |

terraform/container-apps-hosting.tf

@@ -37,6 +37,7 @@ module "azure_container_apps_hosting" {
   enable_cdn_frontdoor                            = local.enable_cdn_frontdoor
   cdn_frontdoor_forwarding_protocol               = local.cdn_frontdoor_forwarding_protocol
   cdn_frontdoor_enable_rate_limiting              = local.cdn_frontdoor_enable_rate_limiting
+  cdn_frontdoor_waf_custom_rules                  = local.cdn_frontdoor_waf_custom_rules
   cdn_frontdoor_rate_limiting_threshold           = local.cdn_frontdoor_rate_limiting_threshold
   cdn_frontdoor_rate_limiting_duration_in_minutes = local.cdn_frontdoor_rate_limiting_duration_in_minutes
   cdn_frontdoor_host_add_response_headers         = local.cdn_frontdoor_host_add_response_headers

terraform/locals.tf

@@ -28,6 +28,7 @@ locals {
   container_apps_allow_ips_inbound                = var.container_apps_allow_ips_inbound
   cdn_frontdoor_enable_rate_limiting              = var.cdn_frontdoor_enable_rate_limiting
   cdn_frontdoor_rate_limiting_threshold           = var.cdn_frontdoor_rate_limiting_threshold
+  cdn_frontdoor_waf_custom_rules                  = var.cdn_frontdoor_waf_custom_rules
   cdn_frontdoor_rate_limiting_duration_in_minutes = var.cdn_frontdoor_rate_limiting_duration_in_minutes
   cdn_frontdoor_host_add_response_headers         = var.cdn_frontdoor_host_add_response_headers
   cdn_frontdoor_custom_domains                    = var.cdn_frontdoor_custom_domains

terraform/variables.tf

@@ -138,6 +138,22 @@ variable "cdn_frontdoor_rate_limiting_threshold" {
   type        = number
 }
 
+variable "cdn_frontdoor_waf_custom_rules" {
+  description = "Map of all Custom rules you want to apply to the CDN WAF"
+  type = map(object({
+    priority : number,
+    action : string
+    match_conditions : map(object({
+      match_variable : string,
+      match_values : optional(list(string), []),
+      operator : optional(string, "Any"),
+      selector : optional(string, null),
+      negation_condition : optional(bool, false),
+    }))
+  }))
+  default = {}
+}
+
 variable "cdn_frontdoor_host_add_response_headers" {
   description = "List of response headers to add at the CDN Front Door `[{ \"Name\" = \"Strict-Transport-Security\", \"value\" = \"max-age=31536000\" }]`"
   type        = list(map(string))