mirror of
https://github.com/ghndrx/prowler.git
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67 lines
3.3 KiB
Bash
67 lines
3.3 KiB
Bash
#!/usr/bin/env bash
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# Prowler - the handy cloud security tool (copyright 2018) 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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CHECK_ID_extra764="7.64"
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CHECK_TITLE_extra764="[extra764] Check if S3 buckets have secure transport policy (Not Scored) (Not part of CIS benchmark)"
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CHECK_SCORED_extra764="NOT_SCORED"
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CHECK_TYPE_extra764="EXTRA"
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CHECK_SEVERITY_extra764="Medium"
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CHECK_ASFF_RESOURCE_TYPE_extra764="AwsS3Bucket"
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CHECK_ALTERNATE_check764="extra764"
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extra764(){
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LIST_OF_BUCKETS=$($AWSCLI s3api list-buckets $PROFILE_OPT --query Buckets[*].Name --output text --region $REGION|xargs -n1)
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if [[ $LIST_OF_BUCKETS ]]; then
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for bucket in $LIST_OF_BUCKETS;do
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TEMP_STP_POLICY_FILE=$(mktemp -t prowler-${ACCOUNT_NUM}-${bucket}.policy.XXXXXXXXXX)
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BUCKET_LOCATION=$($AWSCLI s3api get-bucket-location $PROFILE_OPT --region $REGION --bucket $bucket --output text)
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if [[ "None" == $BUCKET_LOCATION ]]; then
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BUCKET_LOCATION="us-east-1"
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fi
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if [[ "EU" == $BUCKET_LOCATION ]]; then
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BUCKET_LOCATION="eu-west-1"
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fi
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# get bucket policy
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$AWSCLI s3api get-bucket-policy $PROFILE_OPT --bucket $bucket --output text --query Policy --region $BUCKET_LOCATION > $TEMP_STP_POLICY_FILE 2>&1
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if [[ $(grep AccessDenied $TEMP_STP_POLICY_FILE) ]]; then
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textFail "Access Denied Trying to Get Bucket Policy for $bucket"
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rm -f $TEMP_STP_POLICY_FILE
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continue
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fi
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if [[ $(grep NoSuchBucketPolicy $TEMP_STP_POLICY_FILE) ]]; then
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textFail "No bucket policy for $bucket"
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rm -f $TEMP_STP_POLICY_FILE
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continue
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fi
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# https://aws.amazon.com/premiumsupport/knowledge-center/s3-bucket-policy-for-config-rule/
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# checking if $TEMP_STP_POLICY_FILE is a valid json before converting it to json with jq
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policy_str=$(cat "$TEMP_STP_POLICY_FILE")
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if jq -e . >/dev/null 2>&1 <<< "$policy_str"; then
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CHECK_BUCKET_STP_POLICY_PRESENT=$(cat $TEMP_STP_POLICY_FILE | jq --arg arn "arn:${AWS_PARTITION}:s3:::${bucket}" \
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'.Statement[]|select((((.Principal|type == "object") and .Principal.AWS == "*") or ((.Principal|type == "string") and .Principal == "*")) and .Effect=="Deny" and (.Action=="s3:*" or .Action=="*") and (.Resource|type == "array") and (.Resource|map({(.):0})[]|has($arn)) and (.Resource|map({(.):0})[]|has($arn+"/*")) and .Condition.Bool."aws:SecureTransport" == "false")')
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if [[ $CHECK_BUCKET_STP_POLICY_PRESENT ]]; then
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textPass "Bucket $bucket has S3 bucket policy to deny requests over insecure transport"
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else
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textFail "Bucket $bucket allows requests over insecure transport"
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fi
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else
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textInfo "Unknown Error occurred: $policy_str"
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fi
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rm -fr $TEMP_STP_POLICY_FILE
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done
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else
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textInfo "No S3 Buckets found"
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fi
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}
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