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Improved extra73 (s3 bucket permissions)

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Now extra73 checks for S3 policies that have Allow for Principal as *.
This commit is contained in:
Toni de la Fuente
2017-07-21 00:13:11 -04:00
committed by GitHub
parent ed2448dbe0
commit 955cde08fd
1 changed files with 24 additions and 11 deletions
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@@ -384,7 +384,7 @@ genCredReport() {
done
}
# Save report to a file, decode it, deletion at finish and after every single check, acb stands for AWS CIS Benchmark
# Save report to a file, decode it, deletion at finish and after every single check
saveReport(){
TEMP_REPORT_FILE=$(mktemp -t prowler-${ACCOUNT_NUM}-XXXXX.cred_report )
$AWSCLI iam get-credential-report --query 'Content' --output text --profile $PROFILE --region $REGION | decode_report > $TEMP_REPORT_FILE
@@ -1421,7 +1421,7 @@ extra73(){
ID73="7.3"
TITLE73="Ensure there are no S3 buckets open to the Everyone or Any AWS user (Not Scored) (Not part of CIS benchmark)"
textTitle "$ID73" "$TITLE73" "0"
textNotice "Looking for S3 Buckets in all regions... "
textNotice "Looking for open S3 Buckets (ACLs and Policies) in all regions... "
ALL_BUCKETS_LIST=$($AWSCLI s3api list-buckets --query 'Buckets[*].{Name:Name}' --profile $PROFILE --region $REGION --output text)
for bucket in $ALL_BUCKETS_LIST; do
BUCKET_LOCATION=$($AWSCLI s3api get-bucket-location --bucket $bucket --profile $PROFILE --region $REGION --output text)
@@ -1431,18 +1431,31 @@ extra73(){
if [[ "EU" == $BUCKET_LOCATION ]]; then
BUCKET_LOCATION="eu-west-1"
fi
CHECK_BUCKET_ALLUSERS_PERMISSIONS=$($AWSCLI s3api get-bucket-acl --profile $PROFILE --region $BUCKET_LOCATION --bucket $bucket --query "Grants[?Grantee.URI == 'http://acs.amazonaws.com/groups/global/AllUsers']" --output text |grep -v GRANTEE)
CHECK_BUCKET_ALLUSERS_PERMISSIONS_SINGLE_LINE=$(echo -ne $CHECK_BUCKET_ALLUSERS_PERMISSIONS)
CHECK_BUCKET_AUTHUSERS_PERMISSIONS=$($AWSCLI s3api get-bucket-acl --profile $PROFILE --region $BUCKET_LOCATION --bucket $bucket --query "Grants[?Grantee.URI == 'http://acs.amazonaws.com/groups/global/AuthenticatedUsers']" --output text |grep -v GRANTEE)
CHECK_BUCKET_AUTHUSERS_PERMISSIONS_SINGLE_LINE=$(echo -ne $CHECK_BUCKET_AUTHUSERS_PERMISSIONS)
if [[ $CHECK_BUCKET_ALLUSERS_PERMISSIONS ]];then
textWarn "$BUCKET_LOCATION: $bucket bucket is open to the Internet (Everyone) with permissions: $CHECK_BUCKET_ALLUSERS_PERMISSIONS_SINGLE_LINE" "$regx"
else
if [[ $CHECK_BUCKET_AUTHUSERS_PERMISSIONS ]];then
textWarn "$BUCKET_LOCATION: $bucket bucket is open to Authenticated users (Any AWS user) with permissions: $CHECK_BUCKET_AUTHUSERS_PERMISSIONS_SINGLE_LINE" "$regx"
# check if AllUsers is in the ACL as Grantee
CHECK_BUCKET_ALLUSERS_ACL=$($AWSCLI s3api get-bucket-acl --profile $PROFILE --region $BUCKET_LOCATION --bucket $bucket --query "Grants[?Grantee.URI == 'http://acs.amazonaws.com/groups/global/AllUsers']" --output text |grep -v GRANTEE)
CHECK_BUCKET_ALLUSERS_ACL_SINGLE_LINE=$(echo -ne $CHECK_BUCKET_ALLUSERS_ACL)
# check if AuthenticatedUsers is in the ACL as Grantee, they will have access with sigened URL only
CHECK_BUCKET_AUTHUSERS_ACL=$($AWSCLI s3api get-bucket-acl --profile $PROFILE --region $BUCKET_LOCATION --bucket $bucket --query "Grants[?Grantee.URI == 'http://acs.amazonaws.com/groups/global/AuthenticatedUsers']" --output text |grep -v GRANTEE)
CHECK_BUCKET_AUTHUSERS_ACL_SINGLE_LINE=$(echo -ne $CHECK_BUCKET_AUTHUSERS_ACL)
# to prevent error NoSuchBucketPolicy first clean the output controlling stderr
TEMP_POLICY_FILE=$(mktemp -t prowler-${ACCOUNT_NUM}-${bucket}.policy)
$AWSCLI s3api get-bucket-policy --profile $PROFILE --region $BUCKET_LOCATION --bucket $bucket --output text --query Policy > $TEMP_POLICY_FILE 2> /dev/null
# check if the S3 policy has Principal as *
CHECK_BUCKET_ALLUSERS_POLICY=$(cat $TEMP_POLICY_FILE | sed -e 's/[{}]/''/g' | awk -v k="text" '{n=split($0,a,","); for (i=1; i<=n; i++) print a[i]}'|awk '/Principal/ && !skip { print } { skip = /Deny/} '|grep ^\"Principal|grep \*)
if [[ $CHECK_BUCKET_ALLUSERS_ACL || $CHECK_BUCKET_AUTHUSERS_ACL || $CHECK_BUCKET_ALLUSERS_POLICY ]];then
if [[ $CHECK_BUCKET_ALLUSERS_ACL ]];then
textWarn "$BUCKET_LOCATION: $bucket bucket is open to the Internet (Everyone) with permissions: $CHECK_BUCKET_ALLUSERS_ACL_SINGLE_LINE" "$regx"
fi
if [[ $CHECK_BUCKET_AUTHUSERS_ACL ]];then
textWarn "$BUCKET_LOCATION: $bucket bucket is open to Authenticated users (Any AWS user) with permissions: $CHECK_BUCKET_AUTHUSERS_ACL_SINGLE_LINE" "$regx"
fi
if [[ $CHECK_BUCKET_ALLUSERS_POLICY ]];then
textWarn "$BUCKET_LOCATION: $bucket bucket policy \"may\" allow Anonymous users to perform actions (Principal: \"*\")" "$regx"
fi
else
textOK "$BUCKET_LOCATION: $bucket bucket is not open" "$regx"
fi
rm -fr $TEMP_POLICY_FILE
done
}