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82 lines
4.3 KiB
Bash
82 lines
4.3 KiB
Bash
#!/usr/bin/env bash
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# Prowler - the handy cloud security tool (copyright 2019) 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_extra7180="7.180"
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CHECK_TITLE_extra7180="[extra7180] Check Lambda Function URL CORS configuration"
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CHECK_SCORED_extra7180="NOT_SCORED"
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CHECK_CIS_LEVEL_extra7180="EXTRA"
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CHECK_SEVERITY_extra7180="Critical"
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CHECK_ASFF_RESOURCE_TYPE_extra7180="AwsLambdaFunction"
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CHECK_ALTERNATE_check7180="extra7180"
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CHECK_SERVICENAME_extra7180="lambda"
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CHECK_RISK_extra7180='Publicly accessible services could expose sensitive data to bad actors.'
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CHECK_REMEDIATION_extra7180='Grant usage permission on a per-resource basis and applying least privilege principle.'
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CHECK_DOC_extra7180='https://docs.aws.amazon.com/secretsmanager/latest/userguide/lambda-functions.html'
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CHECK_CAF_EPIC_extra7180='Infrastructure Security'
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extra7180(){
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for regx in ${REGIONS}; do
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LIST_OF_FUNCTIONS=$("${AWSCLI}" lambda list-functions ${PROFILE_OPT} \
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--region "${regx}" \
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--query 'Functions[*].FunctionName' \
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--output text 2>&1)
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# Check errors
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if grep -q -E 'AccessDenied|UnauthorizedOperation|AuthorizationError' <<< "${LIST_OF_FUNCTIONS}"; then
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textInfo "${regx}: Access Denied trying to list Lambda functions" "${regx}"
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continue
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fi
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if [[ -n "${LIST_OF_FUNCTIONS}" && $(tr '[:upper:]' '[:lower:]' <<< "${LIST_OF_FUNCTIONS}") != "none" ]]; then
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for lambda_function in ${LIST_OF_FUNCTIONS}; do
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# Check if Lambda function has an URL
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LAMBDA_FUNCTION_URL=$("${AWSCLI}" lambda list-function-url-configs ${PROFILE_OPT} \
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--function-name "${lambda_function}" \
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--region "${regx}" \
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--query 'FunctionUrlConfigs[0].[FunctionUrl]' \
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--output text)
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# Check errors
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if grep -q -E 'AccessDenied|UnauthorizedOperation|AuthorizationError' <<< "${AUTH_TYPE}"; then
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textInfo "${regx}: Access Denied trying to get Lambda functions URLs" "${regx}"
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continue
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fi
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if [[ "${LAMBDA_FUNCTION_URL}" != "None" ]]; then
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# Check CORS configuration
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CORS_ALLOW_ORIGINS=$("${AWSCLI}" lambda get-function-url-config ${PROFILE_OPT} \
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--function-name "${lambda_function}" \
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--region "${regx}" \
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--query 'Cors.AllowOrigins' \
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--output text)
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# Check errors
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if grep -q -E 'AccessDenied|UnauthorizedOperation|AuthorizationError' <<< "${AUTH_TYPE}"; then
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textInfo "${regx}: Access Denied trying to get Lambda functions URLs configuration" "${regx}"
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continue
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fi
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# The * is on purpose to check allowed origins
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if [[ "${CORS_ALLOW_ORIGINS}" =~ "*" ]]; then
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textFail "$regx: Lambda function ${lambda_function} URL has a wide CORS configuration" "${regx}" "${lambda_function}"
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elif [[ "${CORS_ALLOW_ORIGINS}" == "None" ]]; then
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textFail "${regx}: Lambda function ${lambda_function} URL has not CORS configured" "${regx}" "${lambda_function}"
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else
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textPass "${regx}: Lambda function ${lambda_function} has not a wide CORS configuration" "${regx}" "${lambda_function}"
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fi
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else
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textInfo "${regx}: Lambda function ${lambda_function} has not a function URL" "${regx}" "${lambda_function}"
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fi
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done
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else
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textInfo "${regx}: No Lambda functions found" "${regx}"
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fi
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done
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}
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