prowler/include/os_detector

#!/usr/bin/env bash

# Prowler - the handy cloud security tool (copyright 2018) 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.


# Functions to manage dates depending on OS
if [ "$OSTYPE" == "linux-gnu" ] || [ "$OSTYPE" == "linux-musl" ]; then
  TEMP_REPORT_FILE=$(mktemp -t -p /tmp prowler.cred_report-XXXXXX)
  # function to compare in days, usage how_older_from_today date
  # date format %Y-%m-%d
  how_older_from_today()
    {
      DATE_TO_COMPARE=$1
      TODAY_IN_DAYS=$(date -d "$(date +%Y-%m-%d)" +%s)
      DATE_FROM_IN_DAYS=$(date -d $DATE_TO_COMPARE +%s)
      DAYS_SINCE=$((($TODAY_IN_DAYS - $DATE_FROM_IN_DAYS )/60/60/24))
      echo $DAYS_SINCE
    }
  # function to convert from timestamp to date, usage timestamp_to_date timestamp
  # output date format %Y-%m-%d
  timestamp_to_date()
    {
      # remove fractions of a second
      TIMESTAMP_TO_CONVERT=$(echo $1 | cut -f1 -d".")
      OUTPUT_DATE=$(date -d @$TIMESTAMP_TO_CONVERT +'%Y-%m-%d')
      echo $OUTPUT_DATE
    }
  decode_report()
    {
      base64 -d
    }
  how_many_days_from_today()
    {
      DATE_TO_COMPARE=$1
      TODAY_IN_DAYS=$(date -d "$(date +%Y-%m-%d)" +%s)
      DATE_IN_DAYS=$(date -d $DATE_TO_COMPARE +%s)
      DAYS_TO=$((( $DATE_IN_DAYS - $TODAY_IN_DAYS )/60/60/24))
      echo $DAYS_TO
    }
  get_date_previous_than_months()
    {
      MONTHS_TO_COMPARE=$1
      MONTHS_TO_COMPARE_IN_SECONDS=$(( 60 * 60 * 24 * 31 * $MONTHS_TO_COMPARE ))
      CURRENTSECS=`date +%s`
      STARTDATEINSECS=$(( $CURRENTSECS - $MONTHS_TO_COMPARE_IN_SECONDS ))
      DATE_BEFORE_MONTHS_TO_COMPARE=$(date -d @$STARTDATEINSECS '+%Y-%m-%d')
      echo $DATE_BEFORE_MONTHS_TO_COMPARE
    }
  test_tcp_connectivity()
    {
      HOST=$1
      PORT=$2
      TIMEOUT=$3
      # This is initially for ES port 9300, not not HTTP but I add HTTP error 
      # codes for better handling, so 200 is open and 000 is not responding
      timeout $TIMEOUT bash -c '(echo > /dev/tcp/'$HOST'/'$PORT') >/dev/null 2>&1 && echo "200" || echo "000"'
    }
elif [[ "$OSTYPE" == "darwin"* ]]; then
  # BSD/OSX commands compatibility
  TEMP_REPORT_FILE=$(mktemp -t prowler.cred_report-XXXXXX)
  how_older_from_today()
    {
      DATE_TO_COMPARE=$1
      TODAY_IN_DAYS=$(date +%s)
      DATE_FROM_IN_DAYS=$(date -jf %Y-%m-%d $DATE_TO_COMPARE +%s)
      DAYS_SINCE=$((($TODAY_IN_DAYS - $DATE_FROM_IN_DAYS )/60/60/24))
      echo $DAYS_SINCE
    }
  timestamp_to_date()
    {
      # remove fractions of a second
      TIMESTAMP_TO_CONVERT=$(echo $1 | cut -f1 -d".")
      OUTPUT_DATE=$(date -r $TIMESTAMP_TO_CONVERT +'%Y-%m-%d')
      echo $OUTPUT_DATE
    }
  decode_report()
    {
      base64 -D
    }
  how_many_days_from_today()
    {
      DATE_TO_COMPARE=$1
      TODAY_IN_DAYS=$(date +%s)
      DATE_IN_DAYS=$(date -jf %Y-%m-%d $DATE_TO_COMPARE +%s)
      DAYS_TO=$((( $DATE_IN_DAYS - $TODAY_IN_DAYS )/60/60/24))
      echo $DAYS_TO
    }
  get_date_previous_than_months()
    {
      MONTHS_TO_COMPARE=$1
      DATE_BEFORE_MONTHS_TO_COMPARE=$(date -v -$(echo $MONTHS_TO_COMPARE)m '+%Y-%m-%d')
      echo $DATE_BEFORE_MONTHS_TO_COMPARE
    }
  test_tcp_connectivity()
    {
      HOST=$1
      PORT=$2
      TIMEOUT=$3
      # This is initially for ES port 9300, not not HTTP but I add HTTP error 
      # codes for better handling, so 200 is open and 000 is not responding
      nc -z -G $TIMEOUT $HOST $PORT >/dev/null 2>&1 && echo "200" || echo "000"
    }
elif [[ "$OSTYPE" == "cygwin" ]]; then
  # POSIX compatibility layer and Linux environment emulation for Windows
  TEMP_REPORT_FILE=$(mktemp -t -p /tmp prowler.cred_report-XXXXXX)
  how_older_from_today()
    {
      DATE_TO_COMPARE=$1
      TODAY_IN_DAYS=$(date -d "$(date +%Y-%m-%d)" +%s)
      DATE_FROM_IN_DAYS=$(date -d $DATE_TO_COMPARE +%s)
      DAYS_SINCE=$((($TODAY_IN_DAYS - $DATE_FROM_IN_DAYS )/60/60/24))
      echo $DAYS_SINCE
    }
  timestamp_to_date()
    {
      # remove fractions of a second
      TIMESTAMP_TO_CONVERT=$(echo $1 | cut -f1 -d".")
      OUTPUT_DATE=$(date -d @$TIMESTAMP_TO_CONVERT +'%Y-%m-%d')
      echo $OUTPUT_DATE
    }
  decode_report()
    {
      base64 -d
    }
  how_many_days_from_today()
    {
      DATE_TO_COMPARE=$1
      TODAY_IN_DAYS=$(date -d "$(date +%Y-%m-%d)" +%s)
      DATE_IN_DAYS=$(date -d $DATE_TO_COMPARE +%s)
      DAYS_TO=$((( $TODAY_IN_DAYS - $DATE_IN_DAYS )/60/60/24))
      echo $DAYS_TO
    }
  get_date_previous_than_months()
    {
      MONTHS_TO_COMPARE=$1
      MONTHS_TO_COMPARE_IN_SECONDS=$(( 60 * 60 * 24 * 31 * $MONTHS_TO_COMPARE ))
      CURRENTSECS=`date +%s`
      STARTDATEINSECS=$(( $CURRENTSECS - $MONTHS_TO_COMPARE_IN_SECONDS ))
      DATE_BEFORE_MONTHS_TO_COMPARE=$(date -d @$STARTDATEINSECS '+%Y-%m-%d')
      echo $DATE_BEFORE_MONTHS_TO_COMPARE
    }
else
      echo "Unknown Operating System! Valid \$OSTYPE: linux-gnu, linux-musl, darwin* or cygwin"
      echo "Found: $OSTYPE"
      EXITCODE=1
      exit $EXITCODE
fi