#!/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_extra775="7.75"
CHECK_TITLE_extra775="[extra775] Find secrets in EC2 Auto Scaling Launch Configuration (Not Scored) (Not part of CIS benchmark)"
CHECK_SCORED_extra775="NOT_SCORED"
CHECK_TYPE_extra775="EXTRA"
CHECK_SEVERITY_extra775="Medium"
CHECK_ALTERNATE_check775="extra775"

extra775(){
  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 EC2 Auto Scaling Launch Configuration across all regions... (max 100 autoscaling_configurations per region use -m to increase it)  "
  for regx in $REGIONS; do
    LIST_OF_EC2_AUTOSCALING=$($AWSCLI autoscaling describe-launch-configurations $PROFILE_OPT --region $regx --query LaunchConfigurations[*].LaunchConfigurationName --output text --max-items $MAXITEMS | grep -v None)
    if [[ $LIST_OF_EC2_AUTOSCALING ]];then
      for autoscaling_configuration in $LIST_OF_EC2_AUTOSCALING; do
        EC2_AUTOSCALING_USERDATA_FILE="$SECRETS_TEMP_FOLDER/extra775-$autoscaling_configuration-userData.decoded"
        EC2_AUTOSCALING_USERDATA=$($AWSCLI autoscaling describe-launch-configurations $PROFILE_OPT --launch-configuration-names $autoscaling_configuration --region $regx --query LaunchConfigurations[*].UserData --output text| grep -v ^None | decode_report > $EC2_AUTOSCALING_USERDATA_FILE)
        if [ -s $EC2_AUTOSCALING_USERDATA_FILE ];then
          FILE_FORMAT_ASCII=$(file -b $EC2_AUTOSCALING_USERDATA_FILE | grep ASCII)
          # This finds ftp or http URLs with credentials and common keywords
          # FINDINGS=$(egrep -i '[[:alpha:]]*://[[:alnum:]]*:[[:alnum:]]*@.*/|key|secret|token|pass' $EC2_AUTOSCALING_USERDATA_FILE |wc -l|tr -d '\ ')
          # New implementation using https://github.com/Yelp/detect-secrets
          if [[ $FILE_FORMAT_ASCII ]]; then
          FINDINGS=$(secretsDetector file $EC2_AUTOSCALING_USERDATA_FILE)
            if [[ $FINDINGS -eq 0 ]]; then
              textPass "$regx: No secrets found in $autoscaling_configuration" "$regx"
              # delete file if nothing interesting is there
              rm -f $EC2_AUTOSCALING_USERDATA_FILE
            else
              textFail "$regx: Potential secret found in $autoscaling_configuration" "$regx"
              # delete file to not leave trace, user must look at the autoscaling_configuration User Data
              rm -f $EC2_AUTOSCALING_USERDATA_FILE
            fi
          else
            mv $EC2_AUTOSCALING_USERDATA_FILE $EC2_AUTOSCALING_USERDATA_FILE.gz ; gunzip $EC2_AUTOSCALING_USERDATA_FILE.gz
            FINDINGS=$(secretsDetector file $EC2_AUTOSCALING_USERDATA_FILE)
            if [[ $FINDINGS -eq 0 ]]; then
              textPass "$regx: No secrets found in $autoscaling_configuration User Data" "$regx"
              rm -f $EC2_AUTOSCALING_USERDATA_FILE
            else
              textFail "$regx: Potential secret found in $autoscaling_configuration" "$regx"
            fi
          fi
        else 
          textPass "$regx: No secrets found in $autoscaling_configuration User Data or it is empty" "$regx"
        fi
      done
    else
      textInfo "$regx: No EC2 autoscaling_configurations found" "$regx"
    fi
  done
  rm -rf $SECRETS_TEMP_FOLDER
}