#!/bin/bash

# DigitalOcean Marketplace Image Validation Tool
# © 2021-2022 DigitalOcean LLC.
# This code is licensed under Apache 2.0 license (see LICENSE.md for details)

VERSION="v. 1.8.1"
RUNDATE=$(date)

# Script should be run with SUDO
if [ "$EUID" -ne 0 ]; then
  echo "[Error] - This script must be run with sudo or as the root user."
  exit 1
fi

STATUS=0
PASS=0
WARN=0
FAIL=0

# $1 == command to check for
# returns: 0 == true, 1 == false
cmdExists() {
  if command -v "$1" >/dev/null 2>&1; then
    return 0
  else
    return 1
  fi
}

function getDistro() {
  if [ -f /etc/os-release ]; then
    # freedesktop.org and systemd
    # shellcheck disable=SC1091
    . /etc/os-release
    OS=$NAME
    VER=$VERSION_ID
  elif type lsb_release >/dev/null 2>&1; then
    # linuxbase.org
    OS=$(lsb_release -si)
    VER=$(lsb_release -sr)
  elif [ -f /etc/lsb-release ]; then
    # For some versions of Debian/Ubuntu without lsb_release command
    # shellcheck disable=SC1091
    . /etc/lsb-release
    OS=$DISTRIB_ID
    VER=$DISTRIB_RELEASE
  elif [ -f /etc/debian_version ]; then
    # Older Debian/Ubuntu/etc.
    OS=Debian
    VER=$(cat /etc/debian_version)
  elif [ -f /etc/SuSe-release ]; then
    # Older SuSE/etc.
    :
  elif [ -f /etc/redhat-release ]; then
    # Older Red Hat, CentOS, etc.
    VER=$(cut -d" " -f3 </etc/redhat-release | cut -d "." -f1)
    d=$(cut -d" " -f1 </etc/redhat-release | cut -d "." -f1)
    if [[ $d == "CentOS" ]]; then
      OS="CentOS Linux"
    fi
  else
    # Fall back to uname, e.g. "Linux <version>", also works for BSD, etc.
    OS=$(uname -s)
    VER=$(uname -r)
  fi
}
function loadPasswords() {
  SHADOW=$(cat /etc/shadow)
}

function checkAgent() {
  # Check for the presence of the DO directory in the filesystem
  if [ -d /opt/digitalocean ]; then
    echo -en "\e[41m[FAIL]\e[0m DigitalOcean directory detected.\n"
    ((FAIL++))
    STATUS=2
    if [[ $OS == "CentOS Linux" ]] || [[ $OS == "CentOS Stream" ]] || [[ $OS == "Rocky Linux" ]] || [[ $OS == "AlmaLinux" ]]; then
      echo "To uninstall the agent: 'sudo yum remove droplet-agent'"
      echo "To remove the DO directory: 'find /opt/digitalocean/ -type d -empty -delete'"
    elif [[ $OS == "Ubuntu" ]] || [[ $OS == "Debian" ]]; then
      echo "To uninstall the agent and remove the DO directory: 'sudo apt-get purge droplet-agent'"
    fi
  else
    echo -en "\e[32m[PASS]\e[0m DigitalOcean Monitoring agent was not found\n"
    ((PASS++))
  fi
}

function checkLogs() {
  cp_ignore="/var/log/cpanel-install.log"
  echo -en "\nChecking for log files in /var/log\n\n"
  # Check if there are log archives or log files that have not been recently cleared.
  for f in /var/log/*-????????; do
    [[ -e $f ]] || break
    if [ "$f" != "$cp_ignore" ]; then
      echo -en "\e[93m[WARN]\e[0m Log archive ${f} found; Contents:\n"
      cat "$f"
      ((WARN++))
      if [[ $STATUS != 2 ]]; then
        STATUS=1
      fi
    fi
  done
  for f in /var/log/*.[0-9]; do
    [[ -e $f ]] || break
    echo -en "\e[93m[WARN]\e[0m Log archive ${f} found; Contents:\n"
    cat "$f"
    ((WARN++))
    if [[ $STATUS != 2 ]]; then
      STATUS=1
    fi
  done
  for f in /var/log/*.log; do
    [[ -e $f ]] || break
    if [[ "$f" == '/var/log/lfd.log' && "$(grep -E -v '/var/log/messages has been reset| Watching /var/log/messages' "$f" | wc -c)" -gt 50 ]]; then
      if [ "$f" != "$cp_ignore" ]; then
        echo -en "\e[93m[WARN]\e[0m un-cleared log file, ${f} found; Contents:\n"
        cat "$f"
        ((WARN++))
        if [[ $STATUS != 2 ]]; then
          STATUS=1
        fi
      fi
    elif [[ "$f" != '/var/log/lfd.log' && "$(wc -c <"$f")" -gt 50 ]]; then
      if [ "$f" != "$cp_ignore" ]; then
        echo -en "\e[93m[WARN]\e[0m un-cleared log file, ${f} found; Contents:\n"
        cat "$f"
        ((WARN++))
        if [[ $STATUS != 2 ]]; then
          STATUS=1
        fi
      fi
    fi
  done
}

function checkRoot() {
  user="root"
  uhome="/root"
  for usr in "${SHADOW[@]}"; do
    IFS=':' read -r -a u <<<"$usr"
    if [[ "${u[0]}" == "$user" ]]; then
      if [[ ${u[1]} == "!" ]] || [[ ${u[1]} == "!!" ]] || [[ ${u[1]} == "*" ]]; then
        echo -en "\e[32m[PASS]\e[0m User ${user} has no password set.\n"
        ((PASS++))
      else
        echo -en "\e[41m[FAIL]\e[0m User ${user} has a password set on their account.\n"
        ((FAIL++))
        STATUS=2
      fi
    fi
  done
  if [ -d "$uhome"/ ]; then
    if [ -d "$uhome"/.ssh/ ]; then
      if ls "$uhome"/.ssh/* >/dev/null 2>&1; then
        for key in "$uhome"/.ssh/*; do
          if [ "$key" == "${uhome}/.ssh/authorized_keys" ]; then

            if [ "$(wc -c <"$key")" -gt 50 ]; then
              echo -en "\e[41m[FAIL]\e[0m User \e[1m${user}\e[0m has a populated authorized_keys file in \e[93m${key}\e[0m\n"
              akey=$(cat "$key")
              echo "File Contents:"
              echo "$akey"
              echo "--------------"
              ((FAIL++))
              STATUS=2
            fi
          elif [ "$key" == "${uhome}/.ssh/id_rsa" ]; then
            if [ "$(wc -c <"$key")" -gt 0 ]; then
              echo -en "\e[41m[FAIL]\e[0m User \e[1m${user}\e[0m has a private key file in \e[93m${key}\e[0m\n"
              akey=$(cat "$key")
              echo "File Contents:"
              echo "$akey"
              echo "--------------"
              ((FAIL++))
              STATUS=2
            else
              echo -en "\e[93m[WARN]\e[0m User \e[1m${user}\e[0m has empty private key file in \e[93m${key}\e[0m\n"
              ((WARN++))
              if [[ $STATUS != 2 ]]; then
                STATUS=1
              fi
            fi
          elif [ "$key" != "${uhome}/.ssh/known_hosts" ]; then
            echo -en "\e[93m[WARN]\e[0m User \e[1m${user}\e[0m has a file in their .ssh directory at \e[93m${key}\e[0m\n"
            ((WARN++))
            if [[ $STATUS != 2 ]]; then
              STATUS=1
            fi
          else
            if [ "$(wc -c <"$key")" -gt 50 ]; then
              echo -en "\e[93m[WARN]\e[0m User \e[1m${user}\e[0m has a populated known_hosts file in \e[93m${key}\e[0m\n"
              ((WARN++))
              if [[ $STATUS != 2 ]]; then
                STATUS=1
              fi
            fi
          fi
        done
      else
        echo -en "\e[32m[ OK ]\e[0m User \e[1m${user}\e[0m has no SSH keys present\n"
      fi
    else
      echo -en "\e[32m[ OK ]\e[0m User \e[1m${user}\e[0m does not have an .ssh directory\n"
    fi
    if [ -f /root/.bash_history ]; then

      BH_S=$(wc -c </root/.bash_history)

      if [[ $BH_S -lt 200 ]]; then
        echo -en "\e[32m[PASS]\e[0m ${user}'s Bash History appears to have been cleared\n"
        ((PASS++))
      else
        echo -en "\e[41m[FAIL]\e[0m ${user}'s Bash History should be cleared to prevent sensitive information from leaking\n"
        ((FAIL++))
        STATUS=2
      fi

      return 1
    else
      echo -en "\e[32m[PASS]\e[0m The Root User's Bash History is not present\n"
      ((PASS++))
    fi
  else
    echo -en "\e[32m[ OK ]\e[0m User \e[1m${user}\e[0m does not have a directory in /home\n"
  fi
  echo -en "\n\n"
  return 1
}

function checkUsers() {
  # Check each user-created account
  awk -F: '$3 >= 1000 && $1 != "nobody" {print $1}' </etc/passwd | while IFS= read -r user; do
    # Skip some other non-user system accounts
    if [[ $user == "centos" ]]; then
      :
    elif [[ $user == "nfsnobody" ]]; then
      :
    else
      echo -en "\nChecking user: ${user}...\n"
      for usr in "${SHADOW[@]}"; do
        IFS=':' read -r -a u <<<"$usr"
        if [[ "${u[0]}" == "$user" ]]; then
          if [[ ${u[1]} == "!" ]] || [[ ${u[1]} == "!!" ]] || [[ ${u[1]} == "*" ]]; then
            echo -en "\e[32m[PASS]\e[0m User ${user} has no password set.\n"
            # shellcheck disable=SC2030
            ((PASS++))
          else
            echo -en "\e[41m[FAIL]\e[0m User ${user} has a password set on their account. Only system users are allowed on the image.\n"
            # shellcheck disable=SC2030
            ((FAIL++))
            STATUS=2
          fi
        fi
      done
      #echo "User Found: ${user}"
      uhome="/home/${user}"
      if [ -d "${uhome}/" ]; then
        if [ -d "${uhome}/.ssh/" ]; then
          if ls "${uhome}/.ssh/*" >/dev/null 2>&1; then
            for key in "$uhome"/.ssh/*; do
              if [ "$key" == "${uhome}/.ssh/authorized_keys" ]; then
                if [ "$(wc -c <"$key")" -gt 50 ]; then
                  echo -en "\e[41m[FAIL]\e[0m User \e[1m${user}\e[0m has a populated authorized_keys file in \e[93m${key}\e[0m\n"
                  akey=$(cat "$key")
                  echo "File Contents:"
                  echo "$akey"
                  echo "--------------"
                  ((FAIL++))
                  STATUS=2
                fi
              elif [ "$key" == "${uhome}/.ssh/id_rsa" ]; then
                if [ "$(wc -c <"$key")" -gt 0 ]; then
                  echo -en "\e[41m[FAIL]\e[0m User \e[1m${user}\e[0m has a private key file in \e[93m${key}\e[0m\n"
                  akey=$(cat "$key")
                  echo "File Contents:"
                  echo "$akey"
                  echo "--------------"
                  ((FAIL++))
                  STATUS=2
                else
                  echo -en "\e[93m[WARN]\e[0m User \e[1m${user}\e[0m has empty private key file in \e[93m${key}\e[0m\n"
                  # shellcheck disable=SC2030
                  ((WARN++))
                  if [[ $STATUS != 2 ]]; then
                    STATUS=1
                  fi
                fi
              elif [ "$key" != "${uhome}/.ssh/known_hosts" ]; then

                echo -en "\e[93m[WARN]\e[0m User \e[1m${user}\e[0m has a file in their .ssh directory named \e[93m${key}\e[0m\n"
                ((WARN++))
                if [[ $STATUS != 2 ]]; then
                  STATUS=1
                fi

              else
                if [ "$(wc -c <"$key")" -gt 50 ]; then
                  echo -en "\e[93m[WARN]\e[0m User \e[1m${user}\e[0m has a known_hosts file in \e[93m${key}\e[0m\n"
                  ((WARN++))
                  if [[ $STATUS != 2 ]]; then
                    STATUS=1
                  fi
                fi
              fi

            done

          else
            echo -en "\e[32m[ OK ]\e[0m User \e[1m${user}\e[0m has no SSH keys present\n"
          fi
        else
          echo -en "\e[32m[ OK ]\e[0m User \e[1m${user}\e[0m does not have an .ssh directory\n"
        fi
      else
        echo -en "\e[32m[ OK ]\e[0m User \e[1m${user}\e[0m does not have a directory in /home\n"
      fi

      # Check for an uncleared .bash_history for this user
      if [ -f "${uhome}/.bash_history" ]; then
        BH_S=$(wc -c <"${uhome}/.bash_history")

        if [[ $BH_S -lt 200 ]]; then
          echo -en "\e[32m[PASS]\e[0m ${user}'s Bash History appears to have been cleared\n"
          ((PASS++))
        else
          echo -en "\e[41m[FAIL]\e[0m ${user}'s Bash History should be cleared to prevent sensitive information from leaking\n"
          ((FAIL++))
          STATUS=2

        fi
        echo -en "\n\n"
      fi
    fi
  done
}
function checkFirewall() {

  if [[ $OS == "Ubuntu" ]]; then
    fw="ufw"
    ufwa=$(ufw status | head -1 | sed -e "s/^Status:\ //")
    if [[ $ufwa == "active" ]]; then
      FW_VER="\e[32m[PASS]\e[0m Firewall service (${fw}) is active\n"
      # shellcheck disable=SC2031
      ((PASS++))
    else
      FW_VER="\e[93m[WARN]\e[0m No firewall is configured. Ensure ${fw} is installed and configured\n"
      # shellcheck disable=SC2031
      ((WARN++))
    fi
  elif [[ $OS == "CentOS Linux" ]] || [[ $OS == "CentOS Stream" ]] || [[ $OS == "Rocky Linux" ]] || [[ $OS == "AlmaLinux" ]]; then
    if [ -f /usr/lib/systemd/system/csf.service ]; then
      fw="csf"
      if [[ $(systemctl status "$fw" >/dev/null 2>&1) ]]; then

        FW_VER="\e[32m[PASS]\e[0m Firewall service (${fw}) is active\n"
        ((PASS++))
      elif cmdExists "firewall-cmd"; then
        if [[ $(systemctl is-active firewalld >/dev/null 2>&1 && echo 1 || echo 0) ]]; then
          FW_VER="\e[32m[PASS]\e[0m Firewall service (${fw}) is active\n"
          ((PASS++))
        else
          FW_VER="\e[93m[WARN]\e[0m No firewall is configured. Ensure ${fw} is installed and configured\n"
          ((WARN++))
        fi
      else
        FW_VER="\e[93m[WARN]\e[0m No firewall is configured. Ensure ${fw} is installed and configured\n"
        ((WARN++))
      fi
    else
      fw="firewalld"
      if [[ $(systemctl is-active firewalld >/dev/null 2>&1 && echo 1 || echo 0) ]]; then
        FW_VER="\e[32m[PASS]\e[0m Firewall service (${fw}) is active\n"
        ((PASS++))
      else
        FW_VER="\e[93m[WARN]\e[0m No firewall is configured. Ensure ${fw} is installed and configured\n"
        ((WARN++))
      fi
    fi
  elif [[ "$OS" =~ Debian.* ]]; then
    # user could be using a number of different services for managing their firewall
    # we will check some of the most common
    if cmdExists 'ufw'; then
      fw="ufw"
      ufwa=$(ufw status | head -1 | sed -e "s/^Status:\ //")
      if [[ $ufwa == "active" ]]; then
        FW_VER="\e[32m[PASS]\e[0m Firewall service (${fw}) is active\n"
        ((PASS++))
      else
        FW_VER="\e[93m[WARN]\e[0m No firewall is configured. Ensure ${fw} is installed and configured\n"
        ((WARN++))
      fi
    elif cmdExists "firewall-cmd"; then
      fw="firewalld"
      if [[ $(systemctl is-active --quiet "$fw") ]]; then
        FW_VER="\e[32m[PASS]\e[0m Firewall service (${fw}) is active\n"
        ((PASS++))
      else
        FW_VER="\e[93m[WARN]\e[0m No firewall is configured. Ensure ${fw} is installed and configured\n"
        ((WARN++))
      fi
    else
      # user could be using vanilla iptables, check if kernel module is loaded
      fw="iptables"
      if lsmod | grep -q '^ip_tables' 2>/dev/null; then
        FW_VER="\e[32m[PASS]\e[0m Firewall service (${fw}) is active\n"
        ((PASS++))
      else
        FW_VER="\e[93m[WARN]\e[0m No firewall is configured. Ensure ${fw} is installed and configured\n"
        ((WARN++))
      fi
    fi
  fi

}
function checkUpdates() {
  if [[ $OS == "Ubuntu" ]] || [[ "$OS" =~ Debian.* ]]; then
    # Ensure /tmp exists and has the proper permissions before
    # checking for security updates
    # https://github.com/digitalocean/marketplace-partners/issues/94
    if [[ ! -d /tmp ]]; then
      mkdir /tmp
    fi
    chmod 1777 /tmp

    echo -en "\nUpdating apt package database to check for security updates, this may take a minute...\n\n"
    apt-get -y update >/dev/null

    uc=$(apt-get --just-print upgrade | grep -i "security" -c)
    if [[ $uc -gt 0 ]]; then
      update_count=$((uc / 2))
    else
      update_count=0
    fi

    if [[ $update_count -gt 0 ]]; then
      echo -en "\e[41m[FAIL]\e[0m There are ${update_count} security updates available for this image that have not been installed.\n"
      echo -en
      echo -en "Here is a list of the security updates that are not installed:\n"
      sleep 2
      apt-get --just-print upgrade | grep -i security | awk '{print $2}' | awk '!seen[$0]++'
      echo -en
      # shellcheck disable=SC2031
      ((FAIL++))
      STATUS=2
    else
      echo -en "\e[32m[PASS]\e[0m There are no pending security updates for this image.\n\n"
      ((PASS++))
    fi
  elif [[ $OS == "CentOS Linux" ]] || [[ $OS == "CentOS Stream" ]] || [[ $OS == "Rocky Linux" ]] || [[ $OS == "AlmaLinux" ]]; then
    echo -en "\nChecking for available security updates, this may take a minute...\n\n"

    update_count=$(yum check-update --security --quiet | wc -l)
    if [[ $update_count -gt 0 ]]; then
      echo -en "\e[41m[FAIL]\e[0m There are ${update_count} security updates available for this image that have not been installed.\n"
      ((FAIL++))
      STATUS=2
    else
      echo -en "\e[32m[PASS]\e[0m There are no pending security updates for this image.\n"
      ((PASS++))
    fi
  else
    echo "Error encountered"
    exit 1
  fi

  return 1
}
function checkCloudInit() {

  if hash cloud-init 2>/dev/null; then
    CI="\e[32m[PASS]\e[0m Cloud-init is installed.\n"
    ((PASS++))
  else
    CI="\e[41m[FAIL]\e[0m No valid verison of cloud-init was found.\n"
    ((FAIL++))
    STATUS=2
  fi
  return 1
}

clear
echo "DigitalOcean Marketplace Image Validation Tool ${VERSION}"
echo "Executed on: ${RUNDATE}"
echo "Checking local system for Marketplace compatibility..."

getDistro

echo -en "\n\e[1mDistribution:\e[0m ${OS}\n"
echo -en "\e[1mVersion:\e[0m ${VER}\n\n"

ost=0
osv=0

if [[ $OS == "Ubuntu" ]]; then
  ost=1
  if [[ $VER == "22.10" ]] || [[ $VER == "22.04" ]] || [[ $VER == "20.04" ]] || [[ $VER == "18.04" ]] || [[ $VER == "16.04" ]]; then
    osv=1
  fi

elif [[ "$OS" =~ Debian.* ]]; then
  ost=1
  case "$VER" in
  9)
    osv=1
    ;;
  10)
    osv=1
    ;;
  11)
    osv=1
    ;;
  12)
    osv=1
    ;;
  *)
    osv=2
    ;;
  esac

elif [[ $OS == "CentOS Linux" ]]; then
  ost=1
  if [[ $VER == "8" ]]; then
    osv=1
  elif [[ $VER == "7" ]]; then
    osv=1
  elif [[ $VER == "6" ]]; then
    osv=1
  else
    osv=2
  fi
elif [[ $OS == "CentOS Stream" ]]; then
  ost=1
  if [[ $VER == "8" ]]; then
    osv=1
  elif [[ $VER == "9" ]]; then
    osv=1
  else
    osv=2
  fi
elif [[ $OS == "Rocky Linux" ]]; then
  ost=1
  if [[ $VER =~ 8\. ]] || [[ $VER =~ 9\. ]]; then
    osv=1
  else
    osv=2
  fi
elif [[ $OS == "AlmaLinux" ]]; then
  ost=1
  if [[ "$VERSION" =~ 8.* ]] || [[ "$VERSION" =~ 9.* ]]; then
    osv=1
  else
    osv=2
  fi
else
  ost=0
fi

if [[ $ost == 1 ]]; then
  echo -en "\e[32m[PASS]\e[0m Supported Operating System Detected: ${OS}\n"
  ((PASS++))
else
  echo -en "\e[41m[FAIL]\e[0m ${OS} is not a supported Operating System\n"
  ((FAIL++))
  STATUS=2
fi

if [[ $osv == 1 ]]; then
  echo -en "\e[32m[PASS]\e[0m Supported Release Detected: ${VER}\n"
  ((PASS++))
elif [[ $ost == 1 ]]; then
  echo -en "\e[41m[FAIL]\e[0m ${OS} ${VER} is not a supported Operating System Version\n"
  ((FAIL++))
  STATUS=2
else
  echo "Exiting..."
  exit 1
fi

checkCloudInit

echo -en "$CI"

checkFirewall

echo -en "$FW_VER"

checkUpdates

loadPasswords

checkLogs

echo -en "\n\nChecking all user-created accounts...\n"
checkUsers

echo -en "\n\nChecking the root account...\n"
checkRoot

checkAgent

# Summary
echo -en "\n\n---------------------------------------------------------------------------------------------------\n"

if [[ $STATUS == 0 ]]; then
  echo -en "Scan Complete.\n\e[32mAll Tests Passed!\e[0m\n"
elif [[ $STATUS == 1 ]]; then
  echo -en "Scan Complete. \n\e[93mSome non-critical tests failed.  Please review these items.\e[0m\e[0m\n"
else
  echo -en "Scan Complete. \n\e[41mOne or more tests failed.  Please review these items and re-test.\e[0m\n"
fi
echo "---------------------------------------------------------------------------------------------------"
echo -en "\e[1m${PASS} Tests PASSED\e[0m\n"
echo -en "\e[1m${WARN} WARNINGS\e[0m\n"
echo -en "\e[1m${FAIL} Tests FAILED\e[0m\n"
echo -en "---------------------------------------------------------------------------------------------------\n"

if [[ $STATUS == 0 ]]; then
  echo -en "We did not detect any issues with this image. Please be sure to manually ensure that all software installed on the base system is functional, secure and properly configured (or facilities for configuration on first-boot have been created).\n\n"
  exit 0
elif [[ $STATUS == 1 ]]; then
  echo -en "Please review all [WARN] items above and ensure they are intended or resolved.  If you do not have a specific requirement, we recommend resolving these items before image submission\n\n"
  exit 0
else
  echo -en "Some critical tests failed.  These items must be resolved and this scan re-run before you submit your image to the DigitalOcean Marketplace.\n\n"
  exit 1
fi
