New check 7171 Classic load balancers are protected by AWS Shield Advanced

checks/check_extra7171

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+
+# Prowler - the handy cloud security tool (copyright 2019) by Toni de la Fuente
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License. You may obtain a copy
+# of the License at http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software distributed
+# under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+# CONDITIONS OF ANY KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations under the License.
+
+CHECK_ID_extra7171="7.171"
+CHECK_TITLE_extra7171="[extra7171] Check if classic load balancers are protected by AWS Shield"
+CHECK_SCORED_extra7171="NOT_SCORED"
+CHECK_CIS_LEVEL_extra7171="EXTRA"
+CHECK_SEVERITY_check="Medium"
+CHECK_ASFF_RESOURCE_TYPE_extra7171="AwsElasticLoadBalancingLoadBalancer"
+CHECK_ALTERNATE_extra7171="extra7171"
+CHECK_SERVICENAME_extra7171="shield"
+CHECK_RISK_extra7171='AWS Shield Advanced provides expanded DDoS attack protection for your resources'
+CHECK_REMEDIATION_extra7171='Add as a protected resource in AWS Shield Advanced.'
+CHECK_DOC_extra7171='https://docs.aws.amazon.com/waf/latest/developerguide/configure-new-protection.html'
+CHECK_CAF_EPIC_extra7171='Infrastructure security'
+
+extra7171() {
+  if [[ "$($AWSCLI shield get-subscription-state --output text)" == "ACTIVE" ]]; then
+    CALLER_IDENTITY=$($AWSCLI sts get-caller-identity $PROFILE_OPT --query Arn)
+    PARTITION=$(echo $CALLER_IDENTITY | cut -d: -f2)
+    ACCOUNT_ID=$(echo $CALLER_IDENTITY | cut -d: -f5)
+    for regx in $REGIONS; do
+      LIST_OF_CLASSIC_LOAD_BALANCERS=$($AWSCLI elb describe-load-balancers $PROFILE_OPT --region $regx --query 'LoadBalancerDescriptions[?Scheme == `internet-facing`].[LoadBalancerName]' --output text |grep -v '^None$')
+      if [[ $LIST_OF_CLASSIC_LOAD_BALANCERS ]]; then
+        for elb in $LIST_OF_CLASSIC_LOAD_BALANCERS; do
+          ELB_ARN="arn:${PARTITION}:elasticloadbalancing:${regx}:${ACCOUNT_ID}:loadbalancer/${elb}"
+          if aws shield describe-protection --resource-arn $ELB_ARN >/dev/null 2>&1; then
+            textPass "$regx: ELB $elb is protected by AWS Shield Advanced" "$regx" "$elb"
+          else
+            textFail "$regx: ELB $elb is not protected by AWS Shield Advanced" "$regx" "$elb"
+          fi
+        done
+      else
+        textPass "$regx: no classic load balancers found" "$regx"
+      fi
+    done
+  else
+    textInfo "No AWS Shield Advanced subscription found. Skipping check."
+  fi
+}