#!/usr/bin/env bash

# Prowler - the handy cloud security tool (copyright 2019) by Toni de la Fuente
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy
# of the License at http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software distributed
# under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
# CONDITIONS OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the License.
CHECK_ID_extra762="7.62"
CHECK_TITLE_extra762="[extra762] Find obsolete Lambda runtimes "
CHECK_SCORED_extra762="NOT_SCORED"
CHECK_CIS_LEVEL_extra762="EXTRA"
CHECK_SEVERITY_extra762="Medium"
CHECK_ASFF_RESOURCE_TYPE_extra762="AwsLambdaFunction"
CHECK_ALTERNATE_check762="extra762"
CHECK_SERVICENAME_extra762="lambda"
CHECK_RISK_extra762='If you have functions running on a runtime that will be deprecated in the next 60 days; Lambda notifies you by email that you should prepare by migrating your function to a supported runtime. In some cases; such as security issues that require a backwards-incompatible update; or software that does not support a long-term support (LTS) schedule; advance notice might not be possible. After a runtime is deprecated; Lambda might retire it completely at any time by disabling invocation. Deprecated runtimes are not eligible for security updates or technical support.'
CHECK_REMEDIATION_extra762='Test new runtimes as they are made available. Implement them in production as soon as possible.'
CHECK_DOC_extra762='https://docs.aws.amazon.com/lambda/latest/dg/runtime-support-policy.html'
CHECK_CAF_EPIC_extra762='Infrastructure Security'

extra762(){

  # regex to match OBSOLETE runtimes in string functionName%runtime
  # https://docs.aws.amazon.com/lambda/latest/dg/runtime-support-policy.html
  OBSOLETE='nodejs4.3|nodejs4.3-edge|nodejs6.10|nodejs8.10|dotnetcore1.0|dotnetcore2.0|dotnetcore2.1|python3.6|python2.7|ruby2.5|nodejs10.x|nodejs'

  for regx in $REGIONS; do
    LIST_OF_FUNCTIONS=$("$AWSCLI" lambda list-functions $PROFILE_OPT --region "$regx" --query 'Functions[*].[Runtime,FunctionName]' --output text 2>&1)
    if grep -q -E 'AccessDenied|UnauthorizedOperation|AuthorizationError' <<< "$LIST_OF_FUNCTIONS"; then
        textInfo "$regx: Access Denied trying to list functions" "$regx"
        continue
    fi 
    if [[ $LIST_OF_FUNCTIONS ]]; then
      while read -r FUNCTION_RUNTIME FUNCTION_NAME; do
        if grep -wEq $OBSOLETE <<< "${FUNCTION_RUNTIME}" ; then
          textFail "$regx: Obsolete runtime: ${FUNCTION_RUNTIME} used by: ${FUNCTION_NAME}" "$regx" "${FUNCTION_NAME}"
        else
          textPass "$regx: Supported runtime: ${FUNCTION_RUNTIME} used by: ${FUNCTION_NAME}" "$regx" "${FUNCTION_NAME}"
        fi
      done<<<"${LIST_OF_FUNCTIONS}"
    else
      textInfo "$regx: No Lambda functions found" "$regx"
    fi
  done
}