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https://github.com/ghndrx/prowler.git
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65 lines
3.2 KiB
Bash
65 lines
3.2 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_extra736="7.36"
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CHECK_TITLE_extra736="[extra736] Check exposed KMS keys"
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CHECK_SCORED_extra736="NOT_SCORED"
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CHECK_CIS_LEVEL_extra736="EXTRA"
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CHECK_SEVERITY_extra736="Critical"
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CHECK_ASFF_RESOURCE_TYPE_extra736="AwsKmsKey"
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CHECK_ALTERNATE_check736="extra736"
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CHECK_ASFF_COMPLIANCE_TYPE_extra736="ens-op.exp.11.aws.kms.2"
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CHECK_SERVICENAME_extra736="kms"
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CHECK_RISK_extra736='Exposed KMS Keys or wide policy permissions my leave data unprotected.'
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CHECK_REMEDIATION_extra736='To determine the full extent of who or what currently has access to a customer master key (CMK) in AWS KMS; you must examine the CMK key policy; all grants that apply to the CMK; and potentially all AWS Identity and Access Management (IAM) policies. You might do this to determine the scope of potential usage of a CMK.'
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CHECK_DOC_extra736='https://docs.aws.amazon.com/kms/latest/developerguide/determining-access.html'
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CHECK_CAF_EPIC_extra736='Data Protection'
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extra736(){
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for regx in $REGIONS; do
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local CUSTOMER_MANAGED_KMS_KEYS=()
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# First, we need to recover every KMS key
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LIST_OF_KMS_KEYS=$($AWSCLI kms list-keys $PROFILE_OPT --region "${regx}" --query "Keys[].[KeyArn]" --output text)
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if [[ $LIST_OF_KMS_KEYS ]]
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then
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# Second, we need to check for Customer Managed KMS keys, with or without a configured alias
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for keyID in ${LIST_OF_KMS_KEYS}
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do
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KMS_KEY_MANAGER=$($AWSCLI kms describe-key $PROFILE_OPT --region "${regx}" --key-id "${keyID}" --query "KeyMetadata.KeyManager" --output text)
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if [[ "${KMS_KEY_MANAGER}" == "CUSTOMER" ]]
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then
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CUSTOMER_MANAGED_KMS_KEYS+=( "${keyID}" )
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fi
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done
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else
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textInfo "${regx}: No KMS keys found" "${regx}"
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continue
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fi
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# Third, we need to check the policy included in every Customer Managed KMS key
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if [[ "${CUSTOMER_MANAGED_KMS_KEYS[*]}" ]]
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then
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for keyID in "${CUSTOMER_MANAGED_KMS_KEYS[@]}"
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do
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CHECK_POLICY=$($AWSCLI kms get-key-policy --key-id "${keyID}" --policy-name default $PROFILE_OPT --region "${regx}" --output text | jq '.Statement[]|select(.Effect=="Allow" and (((.Principal|type == "object") and .Principal.AWS == "*") or ((.Principal|type == "string") and .Principal == "*")) and .Condition == null)')
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if [[ $CHECK_POLICY ]]; then
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textFail "${regx}: KMS key ${keyID} may be publicly accessible!" "${regx}" "${keyID}"
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else
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textPass "${regx}: KMS key ${keyID} is not exposed to Public" "${regx}" "${keyID}"
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fi
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done
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else
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textInfo "${regx}: No Customer Managed KMS keys found" "${regx}"
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fi
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done
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}
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