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prowler/checks/check31
2021-07-04 12:32:50 +02:00

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#!/usr/bin/env bash
# Prowler - the handy cloud security tool (copyright 2019) 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.
#
# 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/MyCloudTrailLG \
# --filter-name AWSAuthorizationFailures \
# --filter-pattern '{ $.errorCode = "*UnauthorizedOperation" || $.errorCode = "AccessDenied*" }' \
# --metric-transformations metricName=AuthorizationFailureCount,metricNamespace=CloudTrailMetrics,metricValue=1
#
# aws cloudwatch put-metric-alarm \
# --region us-east-1 \
# --alarm-name "Authorization Failures" \
# --alarm-description "Alarm triggered when unauthorized API calls are made" \
# --metric-name AuthorizationFailureCount \
# --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_check31="3.1"
CHECK_TITLE_check31="[check31] Ensure a log metric filter and alarm exist for unauthorized API calls (Scored)"
CHECK_SCORED_check31="SCORED"
CHECK_TYPE_check31="LEVEL1"
CHECK_SEVERITY_check31="Medium"
CHECK_ASFF_TYPE_check31="Software and Configuration Checks/Industry and Regulatory Standards/CIS AWS Foundations Benchmark"
CHECK_ASFF_RESOURCE_TYPE_check31="AwsCloudTrailTrail"
CHECK_ALTERNATE_check301="check31"
CHECK_ASFF_COMPLIANCE_TYPE_check31="ens-op.exp.8.aws.trail.2"
CHECK_SERVICENAME_check31="iam"
CHECK_RISK_check31='Monitoring unauthorized API calls will help reveal application errors and may reduce time to detect malicious activity.'
CHECK_REMEDIATION_check31='It is recommended that a metric filter and alarm be established for unauthorized requests.'
CHECK_DOC_check31='https://docs.aws.amazon.com/awscloudtrail/latest/userguide/cloudwatch-alarms-for-cloudtrail.html'
CHECK_CAF_EPIC_check31='Logging and Monitoring'
check31(){
check3x '\$\.errorCode\s*=\s*"\*UnauthorizedOperation".+\$\.errorCode\s*=\s*"AccessDenied\*"'
}