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71 lines
3.7 KiB
Bash
71 lines
3.7 KiB
Bash
#!/usr/bin/env bash
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# Prowler - the handy cloud security tool (copyright 2020) 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_extra790="7.90"
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CHECK_TITLE_extra790="[extra790] Find trust boundaries in VPC endpoint services allowlisted principles"
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CHECK_SCORED_extra790="NOT_SCORED"
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CHECK_CIS_LEVEL_extra790="EXTRA"
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CHECK_SEVERITY_extra790="Medium"
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CHECK_ASFF_RESOURCE_TYPE_extra790="AwsEc2Vpc"
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CHECK_ALTERNATE_extra790="extra790"
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CHECK_SERVICENAME_extra790="vpc"
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CHECK_RISK_extra790='Account VPC could be linked to other accounts.'
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CHECK_REMEDIATION_extra790='In multi Account environments identify untrusted links. Check trust chaining and dependencies between accounts.'
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CHECK_DOC_extra790='https://github.com/toniblyx/prowler/#trust-boundaries-checks'
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CHECK_CAF_EPIC_extra790='Infrastructure Security'
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extra790(){
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TRUSTED_ACCOUNT_IDS=$( echo "${ACCOUNT_NUM} ${GROUP_TRUSTBOUNDARIES_TRUSTED_ACCOUNT_IDS}" | xargs )
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for regx in ${REGIONS}; do
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ENDPOINT_SERVICES_IDS=$(${AWSCLI} ec2 describe-vpc-endpoint-services \
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${PROFILE_OPT} \
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--query "ServiceDetails[?Owner=='${ACCOUNT_NUM}'].ServiceId" \
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--region ${regx} \
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--output text | xargs 2>&1)
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if [[ $(echo "$ENDPOINT_SERVICES_IDS" | grep -E 'AccessDenied|UnauthorizedOperation|AuthorizationError') ]]; then
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textInfo "$regx: Access Denied trying to describe VPC endpoint services" "$regx"
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continue
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fi
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for ENDPOINT_SERVICE_ID in ${ENDPOINT_SERVICES_IDS}; do
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ENDPOINT_PERMISSIONS_LIST=$(${AWSCLI} ec2 describe-vpc-endpoint-service-permissions \
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${PROFILE_OPT} \
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--service-id ${ENDPOINT_SERVICE_ID} \
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--query "AllowedPrincipals[*].Principal" \
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--region ${regx} \
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--output text | xargs
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)
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for ENDPOINT_PERMISSION in ${ENDPOINT_PERMISSIONS_LIST}; do
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# Take only account id from ENDPOINT_PERMISSION: arn:aws:iam::965406151242:root
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ENDPOINT_PERMISSION_ACCOUNT_ID=$(echo ${ENDPOINT_PERMISSION} | cut -d':' -f5 | xargs)
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for ACCOUNT_ID in ${TRUSTED_ACCOUNT_IDS}; do
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if [[ "${ACCOUNT_ID}" == "${ENDPOINT_PERMISSION_ACCOUNT_ID}" ]]; then
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textPass "${regx}: Found trusted account in VPC endpoint service permission ${ENDPOINT_PERMISSION}" "${regx}"
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# Algorithm:
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# Remove all trusted ACCOUNT_IDs from ENDPOINT_PERMISSIONS_LIST.
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# As a result, the ENDPOINT_PERMISSIONS_LIST finally contains only unknown/untrusted account ids.
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ENDPOINT_PERMISSIONS_LIST=("${ENDPOINT_PERMISSIONS_LIST[@]/$ENDPOINT_PERMISSION}")
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fi
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done
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done
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for UNTRUSTED_PERMISSION in ${ENDPOINT_PERMISSIONS_LIST}; do
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textFail "${regx}: Found untrusted account in VPC endpoint service permission ${UNTRUSTED_PERMISSION}" "${regx}" "${UNTRUSTED_PERMISSION}"
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done
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done
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done
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}
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