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https://github.com/ghndrx/prowler.git
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96 lines
5.3 KiB
Bash
96 lines
5.3 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_extra734="7.34"
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CHECK_TITLE_extra734="[extra734] Check if S3 buckets have default encryption (SSE) enabled or use a bucket policy to enforce it"
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CHECK_SCORED_extra734="NOT_SCORED"
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CHECK_CIS_LEVEL_extra734="EXTRA"
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CHECK_SEVERITY_extra734="Medium"
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CHECK_ASFF_RESOURCE_TYPE_extra734="AwsS3Bucket"
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CHECK_ALTERNATE_check734="extra734"
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CHECK_ASFF_COMPLIANCE_TYPE_extra734="ens-mp.info.3.s3.1"
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CHECK_SERVICENAME_extra734="s3"
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CHECK_RISK_extra734='Amazon S3 default encryption provides a way to set the default encryption behavior for an S3 bucket. This will ensure data-at-rest is encrypted.'
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CHECK_REMEDIATION_extra734='Ensure that S3 buckets has encryption at rest enabled.'
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CHECK_DOC_extra734='https://docs.aws.amazon.com/AmazonS3/latest/dev/bucket-encryption.html'
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CHECK_CAF_EPIC_extra734='Data Protection'
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extra734(){
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LIST_OF_BUCKETS=$("${AWSCLI}" s3api list-buckets ${PROFILE_OPT} --region "${REGION}" --query Buckets[*].Name --output text|xargs -n1)
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if [[ $LIST_OF_BUCKETS ]]; then
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for bucket in $LIST_OF_BUCKETS;do
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BUCKET_LOCATION=$($AWSCLI s3api get-bucket-location ${PROFILE_OPT} --region "${REGION}" --bucket "${bucket}" --output text 2>&1)
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if grep -q 'AccessDenied' <<< "${BUCKET_LOCATION}"; then
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textInfo "${REGION}: Access Denied Trying to Get Bucket Location for ${bucket}" "${REGION}" "${bucket}"
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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 [[ $BUCKET_LOCATION == "EU" ]]; then
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BUCKET_LOCATION="eu-west-1"
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fi
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# For this test to pass one of the following must be present:
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# - Configure ServerSideEncryptionConfiguration rule for AES256 or aws:kms
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# OR
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# - Have bucket policy denying s3:PutObject when s3:x-amz-server-side-encryption is absent
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# query to get if has encryption enabled or not
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RESULT=$("${AWSCLI}" s3api get-bucket-encryption ${PROFILE_OPT} --region ${BUCKET_LOCATION} --bucket "${bucket}" --query ServerSideEncryptionConfiguration.Rules[].ApplyServerSideEncryptionByDefault[].SSEAlgorithm --output text 2>&1)
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if grep -q 'AccessDenied' <<< "${RESULT}"; then
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textInfo "${BUCKET_LOCATION}: Access Denied Trying to Get Encryption for ${bucket}" "${BUCKET_LOCATION}" "${bucket}"
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continue
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elif grep -q 'ServerSideEncryptionConfigurationNotFoundError' <<< "${RESULT}"
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then
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textFail "${BUCKET_LOCATION}: Server Side Encryption configuration is not configured for ${bucket}" "${BUCKET_LOCATION}" "${bucket}"
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continue
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fi
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if [[ "${RESULT}" == "AES256" || "${RESULT}" == "aws:kms" ]];
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then
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textPass "${BUCKET_LOCATION}: Bucket $bucket is enabled for default encryption with ${RESULT}" "${BUCKET_LOCATION}" "${bucket}"
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continue
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fi
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TEMP_SSE_POLICY_FILE=$(mktemp -t prowler-"${ACCOUNT_NUM}"-"${bucket}".policy.XXXXXXXXXX)
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# get bucket policy
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"${AWSCLI}" s3api get-bucket-policy ${PROFILE_OPT} --bucket "${bucket}" --region "${BUCKET_LOCATION}" --output text --query Policy > "${TEMP_SSE_POLICY_FILE}" 2>&1
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if grep -q 'AccessDenied' <<< "${TEMP_SSE_POLICY_FILE}"; then
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textInfo "${BUCKET_LOCATION}: Access Denied Trying to Get Bucket Policy for ${bucket}" "${BUCKET_LOCATION}" "${bucket}"
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rm -f "${TEMP_SSE_POLICY_FILE}"
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continue
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fi
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if grep -q 'NoSuchBucketPolicy' <<< "${TEMP_SSE_POLICY_FILE}"; then
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textFail "${BUCKET_LOCATION}: No bucket policy for ${bucket}" "${BUCKET_LOCATION}" "${bucket}"
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rm -f "${TEMP_SSE_POLICY_FILE}"
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continue
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fi
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# check if the S3 policy forces SSE s3:x-amz-server-side-encryption:true
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CHECK_BUCKET_SSE_POLICY_PRESENT=$(jq --arg arn "arn:${AWS_PARTITION}:s3:::${bucket}/*" '.Statement[]|select(.Effect=="Deny" and ((.Principal|type == "object") and .Principal.AWS == "*") or ((.Principal|type == "string") and .Principal == "*") and .Action=="s3:PutObject" and .Resource==$arn and .Condition.StringNotEquals."s3:x-amz-server-side-encryption" != null)' < "${TEMP_SSE_POLICY_FILE}")
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if [[ "${CHECK_BUCKET_SSE_POLICY_PRESENT}" == "" ]]; then
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textFail "${BUCKET_LOCATION}: Bucket ${bucket} does not enforce encryption!" "${BUCKET_LOCATION}" "${bucket}"
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rm -f "${TEMP_SSE_POLICY_FILE}"
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continue
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fi
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CHECK_BUCKET_SSE_POLICY_VALUE=$(jq -r '.Condition.StringNotEquals."s3:x-amz-server-side-encryption"' <<< "${CHECK_BUCKET_SSE_POLICY_PRESENT}")
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textPass "${BUCKET_LOCATION}: Bucket ${bucket} has S3 bucket policy to enforce encryption with ${CHECK_BUCKET_SSE_POLICY_VALUE}" "${BUCKET_LOCATION}" "${bucket}"
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rm -f "${TEMP_SSE_POLICY_FILE}"
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done
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else
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textInfo "${REGION}: No S3 Buckets found" "${REGION}"
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fi
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}
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