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f5708d7db6
Default encryption (2017): https://aws.amazon.com/blogs/aws/new-amazon-s3-encryption-security-features/ Bucket policy (2016): https://aws.amazon.com/blogs/security/how-to-prevent-uploads-of-unencrypted-objects-to-amazon-s3/
55 lines
2.9 KiB
Bash
55 lines
2.9 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 (Not Scored) (Not part of CIS benchmark)"
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CHECK_SCORED_extra734="NOT_SCORED"
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CHECK_TYPE_extra734="EXTRA"
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CHECK_ALTERNATE_check734="extra734"
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extra734(){
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LIST_OF_BUCKETS=$($AWSCLI s3api list-buckets $PROFILE_OPT --query Buckets[*].Name --output text|xargs -n1)
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if [[ $LIST_OF_BUCKETS ]]; then
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for bucket in $LIST_OF_BUCKETS;do
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# query to get if has encryption enabled or not
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RESULT=$(echo $bucket $($AWSCLI s3api get-bucket-encryption $PROFILE_OPT --bucket $bucket --query ServerSideEncryptionConfiguration.Rules[].ApplyServerSideEncryptionByDefault[].SSEAlgorithm --output text 2>&1 | grep -v ServerSideEncryptionConfigurationNotFoundError))
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TEMP_SSE_POLICY_FILE=$(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 --output text --query Policy > $TEMP_SSE_POLICY_FILE 2> /dev/null
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# check if the S3 policy forces SSE s3:x-amz-server-side-encryption:true
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CHECK_BUCKET_SSE_POLICY_PRESENT=$(cat $TEMP_SSE_POLICY_FILE | sed -e 's/[{}]/''/g' | awk -v k="text" '{n=split($0,a,","); for (i=1; i<=n; i++) print a[i]}'| awk '/Condition/ && !skip { print } { skip = /x-amz-server-side-encryption/} '|grep \"true\")
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CHECK_BUCKET_SSE_POLICY_VALUE=$(cat $TEMP_SSE_POLICY_FILE | sed -e 's/[{}]/''/g' | awk -v k="text" '{n=split($0,a,","); for (i=1; i<=n; i++) print a[i]}'| awk '/Condition/ && !skip { print } { skip = /x-amz-server-side-encryption/} '|grep -Eo "AES256|aws:kms")
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ENCRYPTION=false
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echo "$RESULT" | while read RBUCKET SSEALG; do
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if [[ $SSEALG ]]; then
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textPass "Bucket $RBUCKET has default encryption enabled with algorithm $SSEALG"
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ENCRYPTION=true
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fi
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done
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if [[ $CHECK_BUCKET_SSE_POLICY_PRESENT && $CHECK_BUCKET_SSE_POLICY_VALUE ]]; then
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textPass "Bucket $bucket has S3 bucket policy to enforce encryption with $CHECK_BUCKET_SSE_POLICY_VALUE"
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ENCRYPTION=true
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fi
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if [ "$ENCRYPTION" == false ]; then
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textFail "Bucket $bucket does not enforce encryption!"
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fi
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done
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rm -fr $TEMP_SSE_POLICY_FILE
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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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