#!/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_extra736="7.36"
CHECK_TITLE_extra736="[extra736] Check exposed KMS keys"
CHECK_SCORED_extra736="NOT_SCORED"
CHECK_TYPE_extra736="EXTRA"
CHECK_SEVERITY_extra736="Critical"
CHECK_ASFF_RESOURCE_TYPE_extra736="AwsKmsKey"
CHECK_ALTERNATE_check736="extra736"
CHECK_ASFF_COMPLIANCE_TYPE_extra736="ens-op.exp.11.aws.kms.2"
CHECK_SERVICENAME_extra736="kms"
CHECK_RISK_extra736='Exposed KMS Keys or wide policy permissions my leave data unprotected.'
CHECK_REMEDIATION_extra736='To determine the full extent of who or what currently has access to a customer master key (CMK) in AWS KMS; you must examine the CMK key policy; all grants that apply to the CMK; and potentially all AWS Identity and Access Management (IAM) policies. You might do this to determine the scope of potential usage of a CMK.'
CHECK_DOC_extra736='https://docs.aws.amazon.com/kms/latest/developerguide/determining-access.html'
CHECK_CAF_EPIC_extra736='Data Protection'

extra736(){
  for regx in $REGIONS; do
    LIST_OF_CUSTOMER_KMS_KEYS=$($AWSCLI kms list-aliases $PROFILE_OPT --region $regx --query "Aliases[].[AliasName,TargetKeyId]" --output text |grep -v ^alias/aws/ |awk '{ print $2 }')
    if [[ $LIST_OF_CUSTOMER_KMS_KEYS ]];then
      for key in $LIST_OF_CUSTOMER_KMS_KEYS; do
        CHECK_POLICY=$($AWSCLI kms get-key-policy --key-id $key --policy-name default $PROFILE_OPT --region $regx  --output text|awk '/Principal/{n=NR+1} n>=NR' |grep AWS\"\ :\ \"\\*\"$)
        if [[ $CHECK_POLICY ]]; then
          textFail "$regx: KMS key $key may be publicly accessible!" "$regx" "$key"
        else
          textPass "$regx: KMS key $key is not exposed to Public" "$regx" "$key"
        fi
      done
    else
      textInfo "$regx: No KMS keys found" "$regx"
    fi
  done
}