#!/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_extra718="7.18"
CHECK_TITLE_extra718="[extra718] Check if S3 buckets have server access logging enabled"
CHECK_SCORED_extra718="NOT_SCORED"
CHECK_CIS_LEVEL_extra718="EXTRA"
CHECK_SEVERITY_extra718="Medium"
CHECK_ASFF_RESOURCE_TYPE_extra718="AwsS3Bucket"
CHECK_ALTERNATE_check718="extra718"
CHECK_SERVICENAME_extra718="s3"
CHECK_RISK_extra718='Server access logs can assist you in security and access audits; help you learn about your customer base; and understand your Amazon S3 bill.'
CHECK_REMEDIATION_extra718='Ensure that S3 buckets have Logging enabled. CloudTrail data events can be used in place of S3 bucket logging. If that is the case; this finding can be considered a false positive.'
CHECK_DOC_extra718='https://docs.aws.amazon.com/AmazonS3/latest/dev/security-best-practices.html'
CHECK_CAF_EPIC_extra718='Logging and Monitoring'

extra718(){
  # "Check if S3 buckets have server access logging enabled "
  LIST_OF_BUCKETS=$("${AWSCLI}" s3api list-buckets ${PROFILE_OPT} --query Buckets[*].Name --output text|xargs -n1)
  if [[ $LIST_OF_BUCKETS ]]; then
    for bucket in $LIST_OF_BUCKETS;do
      # Recover Bucket region
      BUCKET_REGION=$("${AWSCLI}" ${PROFILE_OPT} s3api get-bucket-location --bucket "${bucket}" --region "${REGION}" --query LocationConstraint --output text)
      if grep -q -E 'AccessDenied|UnauthorizedOperation|AuthorizationError' <<< "${BUCKET_REGION}"; then
          textInfo "${REGION}: Access Denied trying to get bucket location for ${bucket}" "${REGION}"
          continue
      fi
      # If None use default region
      if [[ "${BUCKET_REGION}" == "None" ]]; then
        BUCKET_REGION="${REGION}"
      fi

      BUCKET_SERVER_LOG_ENABLED=$("${AWSCLI}" s3api get-bucket-logging --bucket "${bucket}" ${PROFILE_OPT} --region "${BUCKET_REGION}" --query [LoggingEnabled] --output text 2>&1)
      if grep -q AccessDenied <<< "${BUCKET_SERVER_LOG_ENABLED}"; then
        textInfo "${BUCKET_REGION}: Access Denied Trying to Get Bucket Logging for ${bucket}" "${BUCKET_REGION}" "${bucket}"
        continue
      fi
      if grep -q "^None$" <<< "${BUCKET_SERVER_LOG_ENABLED}"; then
        textFail "${BUCKET_REGION}: Bucket ${bucket} has server access logging disabled!" "${BUCKET_REGION}" "${bucket}"
      else
        textPass "${BUCKET_REGION}: Bucket ${bucket} has server access logging enabled" "${BUCKET_REGION}" "${bucket}"
      fi
    done
  else
    textInfo "${REGION}: No S3 Buckets found" "${REGION}" "${bucket}"
  fi
}