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56 lines
3.2 KiB
Bash
56 lines
3.2 KiB
Bash
#!/usr/bin/env bash
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# Prowler - the handy cloud security tool (copyright 2019) by Toni de la Fuente
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may not
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# use this file except in compliance with the License. You may obtain a copy
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# of the License at http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software distributed
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# under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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# CONDITIONS OF ANY KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations under the License.
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#
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# Remediation:
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#
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# https://d1.awsstatic.com/whitepapers/compliance/AWS_CIS_Foundations_Benchmark.pdf
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#
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# aws logs put-metric-filter \
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# --region us-east-1 \
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# --log-group-name CloudTrail/CloudWatchLogGroup \
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# --filter-name S3BucketConfigChanges \
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# --filter-pattern '{ ($.eventSource = s3.amazonaws.com) && (($.eventName = PutBucketAcl) || ($.eventName = PutBucketPolicy) || ($.eventName = PutBucketCors) || ($.eventName = PutBucketLifecycle) || ($.eventName = PutBucketReplication) || ($.eventName = DeleteBucketPolicy) || ($.eventName = DeleteBucketCors) || ($.eventName = DeleteBucketLifecycle) || ($.eventName = DeleteBucketReplication)) }' \
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# --metric-transformations metricName=S3BucketEventCount,metricNamespace=CloudTrailMetrics,metricValue=1
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#
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# aws cloudwatch put-metric-alarm \
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# --region us-east-1 \
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# --alarm-name S3BucketConfigChangesAlarm \
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# --alarm-description "Triggered by AWS S3 Bucket config changes." \
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# --metric-name S3BucketEventCount \
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# --namespace CloudTrailMetrics \
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# --statistic Sum \
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# --comparison-operator GreaterThanOrEqualToThreshold \
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# --evaluation-periods 1 \
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# --period 300 \
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# --threshold 1 \
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# --actions-enabled \
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# --alarm-actions arn:aws:sns:us-east-1:123456789012:CloudWatchAlarmTopic
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CHECK_ID_check38="3.8"
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CHECK_TITLE_check38="[check38] Ensure a log metric filter and alarm exist for S3 bucket policy changes"
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CHECK_SCORED_check38="SCORED"
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CHECK_CIS_LEVEL_check38="LEVEL1"
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CHECK_SEVERITY_check38="Medium"
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CHECK_ASFF_TYPE_check38="Software and Configuration Checks/Industry and Regulatory Standards/CIS AWS Foundations Benchmark"
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CHECK_ASFF_RESOURCE_TYPE_check38="AwsCloudTrailTrail"
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CHECK_ALTERNATE_check308="check38"
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CHECK_SERVICENAME_check38="s3"
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CHECK_RISK_check38='Monitoring unauthorized API calls will help reveal application errors and may reduce time to detect malicious activity.'
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CHECK_REMEDIATION_check38='It is recommended that a metric filter and alarm be established for unauthorized requests.'
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CHECK_DOC_check38='https://docs.aws.amazon.com/awscloudtrail/latest/userguide/cloudwatch-alarms-for-cloudtrail.html'
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CHECK_CAF_EPIC_check38='Logging and Monitoring'
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check38(){
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check3x '\$\.eventSource\s*=\s*s3.amazonaws.com.+\$\.eventName\s*=\s*PutBucketAcl.+\$\.eventName\s*=\s*PutBucketPolicy.+\$\.eventName\s*=\s*PutBucketCors.+\$\.eventName\s*=\s*PutBucketLifecycle.+\$\.eventName\s*=\s*PutBucketReplication.+\$\.eventName\s*=\s*DeleteBucketPolicy.+\$\.eventName\s*=\s*DeleteBucketCors.+\$\.eventName\s*=\s*DeleteBucketLifecycle.+\$\.eventName\s*=\s*DeleteBucketReplication'
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}
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