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49 lines
2.4 KiB
Bash
49 lines
2.4 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_extra94="9.4"
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CHECK_TITLE_extra94="[extra94] Check if lambda functions have policies which allow access to everyone having an aws account (Not Scored) (Not part of CIS benchmark) (Custom Check)"
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CHECK_SCORED_extra94="NOT_SCORED"
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CHECK_TYPE_extra94="EXTRA"
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CHECK_SEVERITY_extra94="Critical"
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CHECK_ASFF_RESOURCE_TYPE_extra94="AwsLambda"
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CHECK_ALTERNATE_check94="extra94"
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CHECK_SERVICENAME_extra94="Lambda"
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# If a lambda function has a policy principle as *, It can be accessed by any aws account.
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# We consider such functions as publicly accessible resource.
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extra94(){
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for region in $REGIONS; do
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LIST_OF_LAMBDA_FUNCTIONS=$($AWSCLI lambda list-functions $PROFILE_OPT --region $region --query Functions[*].FunctionName --output text)
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if [[ $LIST_OF_LAMBDA_FUNCTIONS ]]; then
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for lambdaFunction in $LIST_OF_LAMBDA_FUNCTIONS;do
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FUNCTION_POLICY_STATEMENTS=$($AWSCLI lambda $PROFILE_OPT get-policy --region $region --function-name $lambdaFunction --output json --query Policy 2>&1)
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if [[ $FUNCTION_POLICY_STATEMENTS == *ResourceNotFoundException* ]]; then
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textInfo "$region : Lambda function $lambdaFunction doesn't have any policy"
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else
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FUNCTION_POLICY_BAD_STATEMENTS=$(echo $FUNCTION_POLICY_STATEMENTS | jq '. | fromjson' | jq '.Statement[] | select(.Effect=="Allow") | select(.Principal=="*" or .Principal.AWS=="*" or .Principal.CanonicalUser=="*")')
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if [[ $FUNCTION_POLICY_BAD_STATEMENTS != "" ]]; then
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textFail "$region : Lambda function $lambdaFunction allows public access with policy as: $FUNCTION_POLICY_BAD_STATEMENTS"
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else
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textPass "$region : Lambda function $lambdaFunction has policy which doesn't allow access to everyone having an aws account"
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fi
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fi
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done
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else
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textInfo "No lambda functions found in $region region"
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fi
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done
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}
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