ALB listening on HTTP

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Metadata

Id: ee3b1557-9fb5-4685-a95d-93f1edf2a0d7

Cloud Provider: Alicloud

Platform: Terraform

Severity: Medium

Category: Networking and Firewall

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Description

Application Load Balancer (alb) listeners should not use HTTP. Listeners configured with listener_protocol = "HTTP" expose unencrypted traffic. In Terraform, set listener_protocol = "HTTPS" for alicloud_alb_listener resources to enforce TLS termination and secure data in transit.

Compliant Code Examples

resource "alicloud_alb_listener" "negative" {
  load_balancer_id     = alicloud_alb_load_balancer.default_3.id
  listener_protocol    = "HTTPS"
  listener_port        = 443
  listener_description = "createdByTerraform"
  default_actions {
    type = "ForwardGroup"
    forward_group_config {
      server_group_tuples {
        server_group_id = alicloud_alb_server_group.default.id
      }
    }
  }
  certificates {
    certificate_id = join("", [alicloud_ssl_certificates_service_certificate.default.id, "-cn-hangzhou"])
  }
  acl_config {
    acl_type = "White"
    acl_relations {
      acl_id = alicloud_alb_acl.example.id
    }
  }
}

Non-Compliant Code Examples

resource "alicloud_alb_listener" "positive" {
  load_balancer_id     = alicloud_alb_load_balancer.default_3.id
  listener_protocol    = "HTTP"
  listener_port        = 443
  listener_description = "createdByTerraform"
  default_actions {
    type = "ForwardGroup"
    forward_group_config {
      server_group_tuples {
        server_group_id = alicloud_alb_server_group.default.id
      }
    }
  }
  certificates {
    certificate_id = join("", [alicloud_ssl_certificates_service_certificate.default.id, "-cn-hangzhou"])
  }
  acl_config {
    acl_type = "White"
    acl_relations {
      acl_id = alicloud_alb_acl.example.id
    }
  }
}