#!/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_extra759="7.59"
CHECK_TITLE_extra759="[extra759] Find secrets in Lambda functions variables (Not Scored) (Not part of CIS benchmark)"
CHECK_SCORED_extra759="NOT_SCORED"
CHECK_TYPE_extra759="EXTRA"
CHECK_ASFF_RESOURCE_TYPE_extra759="AwsLambdaFunction"
CHECK_ALTERNATE_check759="extra759"

extra759(){
  SECRETS_TEMP_FOLDER="$PROWLER_DIR/secrets-$ACCOUNT_NUM"
  if [[ ! -d $SECRETS_TEMP_FOLDER ]]; then
    # this folder is deleted once this check is finished
    mkdir $SECRETS_TEMP_FOLDER
  fi

  textInfo "Looking for secrets in Lambda variables across all regions... "
  for regx in $REGIONS; do
    LIST_OF_FUNCTIONS=$($AWSCLI lambda list-functions $PROFILE_OPT --region $regx --query Functions[*].FunctionName --output text)
    if [[ $LIST_OF_FUNCTIONS ]]; then
      for lambdafunction in $LIST_OF_FUNCTIONS;do
        LAMBDA_FUNCTION_VARIABLES_FILE="$SECRETS_TEMP_FOLDER/extra759-$lambdafunction-$regx-variables.txt"
        LAMBDA_FUNCTION_VARIABLES=$($AWSCLI lambda $PROFILE_OPT --region $regx get-function-configuration --function-name $lambdafunction --query 'Environment.Variables' --output text > $LAMBDA_FUNCTION_VARIABLES_FILE)
        if [ -s $LAMBDA_FUNCTION_VARIABLES_FILE ];then
        # Implementation using https://github.com/Yelp/detect-secrets
        FINDINGS=$(secretsDetector file $LAMBDA_FUNCTION_VARIABLES_FILE)
          if [[ $FINDINGS -eq 0 ]]; then
            textPass "$regx: No secrets found in Lambda function $lambdafunction variables" "$regx"
            # delete file if nothing interesting is there
            rm -f $LAMBDA_FUNCTION_VARIABLES_FILE
          else
            textFail "$regx: Potential secret found in Lambda function $lambdafunction variables" "$regx"
            # delete file to not leave trace, user must look at the function
            rm -f $LAMBDA_FUNCTION_VARIABLES_FILE
          fi
        else
          textInfo "$regx: Lambda function $stalambdafunction has not variables" "$regx"
        fi
      done
    else
      textInfo "$regx: No Lambda functions found" "$regx"
    fi
  done
  rm -rf $SECRETS_TEMP_FOLDER
}