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https://github.com/ghndrx/prowler.git
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88 lines
3.9 KiB
Bash
88 lines
3.9 KiB
Bash
#!/usr/bin/env bash
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# Prowler - the handy cloud security tool (c) by Toni de la Fuente
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#
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# This Prowler check is licensed under a
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# Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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#
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# You should have received a copy of the license along with this
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# work. If not, see <http://creativecommons.org/licenses/by-nc-sa/4.0/>.
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CHECK_ID_check23="2.3"
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CHECK_TITLE_check23="[check23] Ensure the S3 bucket CloudTrail logs to is not publicly accessible (Scored)"
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CHECK_SCORED_check23="SCORED"
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CHECK_TYPE_check23="LEVEL1"
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CHECK_SEVERITY_check23="Critical"
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CHECK_ASFF_TYPE_check23="Software and Configuration Checks/Industry and Regulatory Standards/CIS AWS Foundations Benchmark"
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CHECK_ASFF_RESOURCE_TYPE_check23="AwsS3Bucket"
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CHECK_ALTERNATE_check203="check23"
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CHECK_ASFF_COMPLIANCE_TYPE_check23="ens-op.exp.10.aws.trail.3 ens-op.exp.10.aws.trail.4"
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CHECK_SERVICENAME_check23="cloudtrail"
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check23(){
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trail_count=0
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# "Ensure the S3 bucket CloudTrail logs to is not publicly accessible (Scored)"
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for regx in $REGIONS; do
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TRAILS_AND_REGIONS=$($AWSCLI cloudtrail describe-trails $PROFILE_OPT --region $regx --query 'trailList[*].{Name:TrailARN, HomeRegion:HomeRegion}' --output text 2>&1 | tr " " ',')
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if [[ $(echo "$TRAILS_AND_REGIONS" | grep AccessDenied) ]]; then
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textFail "Access Denied trying to describe trails in $regx"
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continue
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fi
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if [[ $TRAILS_AND_REGIONS ]]; then
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for reg_trail in $TRAILS_AND_REGIONS; do
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TRAIL_REGION=$(echo $reg_trail | cut -d',' -f1)
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if [ $TRAIL_REGION != $regx ]; then # Only report trails once in home region
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continue
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fi
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trail=$(echo $reg_trail | cut -d',' -f2)
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trail_count=$((trail_count + 1))
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CLOUDTRAILBUCKET=$($AWSCLI cloudtrail describe-trails $PROFILE_OPT --region $TRAIL_REGION --query 'trailList[*].[S3BucketName]' --output text --trail-name-list $trail)
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if [[ -z $CLOUDTRAILBUCKET ]]; then
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textFail "Trail $trail in $TRAIL_REGION does not publish to S3"
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continue
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fi
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CLOUDTRAIL_ACCOUNT_ID=$(echo $trail | awk -F: '{ print $5 }')
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if [ "$CLOUDTRAIL_ACCOUNT_ID" != "$ACCOUNT_NUM" ]; then
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textInfo "Trail $trail in $TRAIL_REGION S3 logging bucket $CLOUDTRAILBUCKET is not in current account"
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continue
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fi
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#
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# LOCATION - requests referencing buckets created after March 20, 2019
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# must be made to S3 endpoints in the same region as the bucket was
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# created.
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#
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BUCKET_LOCATION=$($AWSCLI s3api get-bucket-location $PROFILE_OPT --region $regx --bucket $CLOUDTRAILBUCKET --output text 2>&1)
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if [[ $(echo "$BUCKET_LOCATION" | grep AccessDenied) ]]; then
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textFail "Trail $trail in $TRAIL_REGION Access Denied getting bucket location for $CLOUDTRAILBUCKET"
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continue
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fi
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if [[ $BUCKET_LOCATION == "None" ]]; then
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BUCKET_LOCATION="us-east-1"
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fi
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if [[ $BUCKET_LOCATION == "EU" ]]; then
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BUCKET_LOCATION="eu-west-1"
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fi
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CLOUDTRAILBUCKET_HASALLPERMISIONS=$($AWSCLI s3api get-bucket-acl --bucket $CLOUDTRAILBUCKET $PROFILE_OPT --region $BUCKET_LOCATION --query 'Grants[?Grantee.URI==`http://acs.amazonaws.com/groups/global/AllUsers`]' --output text 2>&1)
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if [[ $(echo "$CLOUDTRAILBUCKET_HASALLPERMISIONS" | grep AccessDenied) ]]; then
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textInfo "Trail $trail in $TRAIL_REGION Access Denied getting bucket acl for $CLOUDTRAILBUCKET"
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continue
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fi
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if [[ -z $CLOUDTRAILBUCKET_HASALLPERMISIONS ]]; then
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textPass "Trail $trail in $TRAIL_REGION S3 logging bucket $CLOUDTRAILBUCKET is not publicly accessible"
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else
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textFail "Trail $trail in $TRAIL_REGION S3 logging bucket $CLOUDTRAILBUCKET is publicly accessible"
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fi
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done
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fi
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done
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if [[ $trail_count == 0 ]]; then
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textFail "No CloudTrail trails were found in the account"
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fi
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}
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