#!/usr/bin/env bash

# Prowler - the handy cloud security tool (c) by Toni de la Fuente
#
# This Prowler check is licensed under a
# Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
#
# You should have received a copy of the license along with this
# work. If not, see <http://creativecommons.org/licenses/by-nc-sa/4.0/>.
#
# Remediation:
#
#   https://d1.awsstatic.com/whitepapers/compliance/AWS_CIS_Foundations_Benchmark.pdf
#
#   aws logs put-metric-filter \
#     --region us-east-1 \
#     --log-group-name CloudTrail/CloudWatchLogGroup \
#     --filter-name RouteTableConfigChanges \
#     --filter-pattern '{ ($.eventName = CreateRoute) || ($.eventName = CreateRouteTable) || ($.eventName = ReplaceRoute) || ($.eventName = ReplaceRouteTableAssociation) || ($.eventName = DeleteRouteTable) || ($.eventName = DeleteRoute) || ($.eventName = DisassociateRouteTable) }' \
#     --metric-transformations metricName=RouteTableEventCount,metricNamespace=CloudTrailMetrics,metricValue=1
#
#   aws cloudwatch put-metric-alarm \
#     --region us-east-1 \
#     --alarm-name RouteTableConfigChangesAlarm \
#     --alarm-description "Triggered by AWS Route Table config changes." \
#     --metric-name RouteTableEventCount \
#     --namespace CloudTrailMetrics \
#     --statistic Sum \
#     --comparison-operator GreaterThanOrEqualToThreshold \
#     --evaluation-periods 1 \
#     --period 300 \
#     --threshold 1 \
#     --actions-enabled \
#     --alarm-actions arn:aws:sns:us-east-1:123456789012:CloudWatchAlarmTopic

CHECK_ID_check313="3.13"
CHECK_TITLE_check313="[check313] Ensure a log metric filter and alarm exist for route table changes (Scored)"
CHECK_SCORED_check313="SCORED"
CHECK_TYPE_check313="LEVEL1"
CHECK_ALTERNATE_check313="check313"

check313(){
  check3x '\$\.eventName\s*=\s*CreateRoute.+\$\.eventName\s*=\s*CreateRouteTable.+\$\.eventName\s*=\s*ReplaceRoute.+\$\.eventName\s*=\s*ReplaceRouteTableAssociation.+\$\.eventName\s*=\s*DeleteRouteTable.+\$\.eventName\s*=\s*DeleteRoute.+\$\.eventName\s*=\s*DisassociateRouteTable'
}