#!/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_extra722="7.22"
CHECK_TITLE_extra722="[extra722] Check if API Gateway has logging enabled"
CHECK_SCORED_extra722="NOT_SCORED"
CHECK_CIS_LEVEL_extra722="EXTRA"
CHECK_SEVERITY_extra722="Medium"
CHECK_ASFF_RESOURCE_TYPE_extra722="AwsApiGatewayRestApi"
CHECK_ALTERNATE_check722="extra722"
CHECK_SERVICENAME_extra722="apigateway"
CHECK_RISK_extra722='If not enabled; monitoring of service use is not possible. Real-time monitoring of API calls can be achieved by directing CloudTrail Logs to CloudWatch Logs and establishing corresponding metric filters and alarms.'
CHECK_REMEDIATION_extra722='Monitoring is an important part of maintaining the reliability; availability; and performance of API Gateway and your AWS solutions. You should collect monitoring data from all of the parts of your AWS solution. CloudTrail provides a record of actions taken by a user; role; or an AWS service in API Gateway. Using the information collected by CloudTrail; you can determine the request that was made to API Gateway; the IP address from which the request was made; who made the request; etc.'
CHECK_DOC_extra722='https://docs.aws.amazon.com/apigateway/latest/developerguide/security-monitoring.html'
CHECK_CAF_EPIC_extra722='Logging and Monitoring'

extra722(){
  # "Check if API Gateway has logging enabled "
  for regx in $REGIONS; do
    LIST_OF_API_GW=$($AWSCLI apigateway get-rest-apis $PROFILE_OPT --region $regx --query items[*].id --output text 2>&1)
    if [[ $(echo "$LIST_OF_API_GW" | grep -E 'AccessDenied|UnauthorizedOperation') ]]; then
        textInfo "$regx: Access Denied trying to get rest APIs" "$regx"
        continue
    fi 
    if [[ $LIST_OF_API_GW ]];then
      for apigwid in $LIST_OF_API_GW;do
        API_GW_NAME=$($AWSCLI apigateway get-rest-apis $PROFILE_OPT --region $regx --query "items[?id==\`$apigwid\`].name" --output text)
        CHECK_STAGES_NAME=$($AWSCLI apigateway get-stages $PROFILE_OPT --region $regx --rest-api-id $apigwid --query "item[*].stageName" --output text)
        if [[ $CHECK_STAGES_NAME ]];then
          for stagname in $CHECK_STAGES_NAME;do
            CHECK_STAGE_METHOD_LOGGING=$($AWSCLI apigateway get-stages $PROFILE_OPT --region $regx --rest-api-id $apigwid --query "item[?stageName == \`$stagname\` ].methodSettings" --output text |awk '{ print $6 }' |egrep 'ERROR|INFO')
            if [[ $CHECK_STAGE_METHOD_LOGGING ]];then
              textPass "$regx: API Gateway $API_GW_NAME ID $apigwid in $stagname has logging enabled as $CHECK_STAGE_METHOD_LOGGING" "$regx" "$API_GW_NAME"
            else
              textFail "$regx: API Gateway $API_GW_NAME ID $apigwid in $stagname has logging disabled" "$regx" "$API_GW_NAME"
            fi
          done
        else
           textFail "$regx: No Stage name found for $API_GW_NAME" "$regx" "$API_GW_NAME"
        fi
      done
    else
       textInfo "$regx: No API Gateway found" "$regx"
    fi
  done
}