#!/usr/bin/env bash

# Prowler - the handy cloud security tool (copyright 2018) 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_extra74="7.4"
CHECK_TITLE_extra74="[extra74] Ensure there are no Security Groups without ingress filtering being used"
CHECK_SCORED_extra74="NOT_SCORED"
CHECK_CIS_LEVEL_extra74="EXTRA"
CHECK_SEVERITY_extra74="High"
CHECK_ASFF_RESOURCE_TYPE_extra74="AwsEc2SecurityGroup"
CHECK_ALTERNATE_extra704="extra74"
CHECK_ALTERNATE_check74="extra74"
CHECK_ALTERNATE_check704="extra74"
CHECK_ASFF_COMPLIANCE_TYPE_extra74="ens-mp.com.4.aws.sg.2"
CHECK_SERVICENAME_extra74="ec2"
CHECK_RISK_extra74='If Security groups are not filtering traffic appropriately the attack surface is increased.'
CHECK_REMEDIATION_extra74=' You can grant access to a specific CIDR range; or to another security group in your VPC or in a peer VPC.'
CHECK_DOC_extra74='https://docs.aws.amazon.com/vpc/latest/userguide/VPC_SecurityGroups.html'
CHECK_CAF_EPIC_extra74='Infrastructure Security'

extra74(){
  # "Ensure there are no Security Groups without ingress filtering being used "
  for regx in $REGIONS; do
    LIST_OF_SECURITYGROUPS=$($AWSCLI ec2 describe-security-groups $PROFILE_OPT --region $regx --filters "Name=ip-permission.cidr,Values=0.0.0.0/0" --query "SecurityGroups[].[GroupId]" --output text --max-items $MAXITEMS 2>&1)
    if [[ $(echo "$LIST_OF_SECURITYGROUPS" | grep -E 'AccessDenied|UnauthorizedOperation') ]]; then
        textInfo "$regx: Access Denied trying to describe security groups" "$regx"
        continue
    fi
    for SG_ID in $LIST_OF_SECURITYGROUPS; do
      SG_NO_INGRESS_FILTER=$($AWSCLI ec2 describe-network-interfaces $PROFILE_OPT --region $regx --filters "Name=group-id,Values=$SG_ID" --query "length(NetworkInterfaces)" --output text)
      if [[ $SG_NO_INGRESS_FILTER -ne 0 ]];then
        textFail "$regx: $SG_ID has no ingress filtering and it is being used!" "$regx" "$SG_ID"
      else
        textInfo "$regx: $SG_ID has no ingress filtering but it is not being used" "$regx" "$SG_ID"
      fi
    done
  done
}