#!/bin/bash
# Boot from a local disk installation

BOARD_NAME=${CONFIG_BOARD_NAME:-${CONFIG_BOARD}} 
MAIN_MENU_TITLE="${BOARD_NAME} | $CONFIG_BRAND_NAME Boot Menu"
export BG_COLOR_MAIN_MENU=""

. /etc/functions
. /etc/gui_functions
. /etc/luks-functions
. /tmp/config

# skip_to_menu is set if the user selects "continue to the main menu" from any
# error, so we will indeed go to the main menu even if other errors occur.  It's
# reset when we reach the main menu so the user can retry from the main menu and
# # see errors again.
skip_to_menu="false"

mount_boot()
{
  TRACE_FUNC
  # Mount local disk if it is not already mounted
  while ! grep -q /boot /proc/mounts ; do
    # try to mount if CONFIG_BOOT_DEV exists
    if [ -e "$CONFIG_BOOT_DEV" ]; then
      mount -o ro $CONFIG_BOOT_DEV /boot 
      [[ $? -eq 0 ]] && continue
    fi

    # CONFIG_BOOT_DEV doesn't exist or couldn't be mounted, so give user options
    BG_COLOR_MAIN_MENU=$BG_COLOR_ERROR
    whiptail $BG_COLOR_ERROR --title "ERROR: No Bootable OS Found!" \
        --menu "    No bootable OS was found on the default boot device $CONFIG_BOOT_DEV.
    How would you like to proceed?" 0 80 4 \
        'b' ' Select a new boot device' \
        'u' ' Boot from USB' \
        'm' ' Continue to the main menu' \
        'x' ' Exit to recovery shell' \
        2>/tmp/whiptail || recovery "GUI menu failed"

    option=$(cat /tmp/whiptail)
    case "$option" in 
      b )
        config-gui.sh boot_device_select
        if [ $? -eq 0 ]; then
          # update CONFIG_BOOT_DEV
          . /tmp/config
          BG_COLOR_MAIN_MENU=""
        fi
        ;;
      u )
        exec /bin/usb-init
        ;;
      m )
        skip_to_menu="true"
        break
        ;;
      * )
        recovery "User requested recovery shell"
        ;;
    esac
  done
}

verify_global_hashes()
{
  TRACE_FUNC
  # Check the hashes of all the files, ignoring signatures for now
  check_config /boot force
  TMP_HASH_FILE="/tmp/kexec/kexec_hashes.txt"
  TMP_TREE_FILE="/tmp/kexec/kexec_tree.txt"
  TMP_PACKAGE_TRIGGER_PRE="/tmp/kexec/kexec_package_trigger_pre.txt"
  TMP_PACKAGE_TRIGGER_POST="/tmp/kexec/kexec_package_trigger_post.txt"

  if verify_checksums /boot ; then
    return 0
  elif [[ ! -f "$TMP_HASH_FILE" || ! -f "$TMP_TREE_FILE" ]] ; then
    if (whiptail $BG_COLOR_ERROR --title 'ERROR: Missing File!' \
        --yesno "One of the files containing integrity information for /boot is missing!\n\nIf you are setting up heads for the first time or upgrading from an\nolder version, select Yes to create the missing files.\n\nOtherwise this could indicate a compromise and you should select No to\nreturn to the main menu.\n\nWould you like to create the missing files now?" 0 80) then
      if update_checksums ; then
        BG_COLOR_MAIN_MENU=""
        return 0;
      else
        whiptail $BG_COLOR_ERROR --title 'ERROR' \
          --msgbox "Failed to update checksums / sign default config" 0 80
      fi
    fi
    BG_COLOR_MAIN_MENU=$BG_COLOR_ERROR
    return 1
  else
    CHANGED_FILES=$(grep -v 'OK$' /tmp/hash_output | cut -f1 -d ':' | tee -a /tmp/hash_output_mismatches)
    CHANGED_FILES_COUNT=$(wc -l /tmp/hash_output_mismatches | cut -f1 -d ' ')

    # if files changed before package manager started, show stern warning
    if [ -f "$TMP_PACKAGE_TRIGGER_PRE" ]; then 
      PRE_CHANGED_FILES=$(grep '^CHANGED_FILES' $TMP_PACKAGE_TRIGGER_POST | cut -f 2 -d '=' | tr -d '"')
      TEXT="The following files failed the verification process BEFORE package updates ran:\n${PRE_CHANGED_FILES}\n\nCompare against the files $CONFIG_BRAND_NAME has detected have changed:\n${CHANGED_FILES}\n\nThis could indicate a compromise!\n\nWould you like to update your checksums anyway?"

    # if files changed after package manager started, probably caused by package manager
    elif [ -f "$TMP_PACKAGE_TRIGGER_POST" ]; then 
      LAST_PACKAGE_LIST=$(grep -E "^(Install|Remove|Upgrade|Reinstall):" $TMP_PACKAGE_TRIGGER_POST)
      UPDATE_INITRAMFS_PACKAGE=$(grep '^UPDATE_INITRAMFS_PACKAGE' $TMP_PACKAGE_TRIGGER_POST | cut -f 2 -d '=' | tr -d '"')

      if [ "$UPDATE_INITRAMFS_PACKAGE" != "" ]; then
        TEXT="The following files failed the verification process AFTER package updates ran:\n${CHANGED_FILES}\n\nThis is likely due to package triggers in$UPDATE_INITRAMFS_PACKAGE.\n\nYou will need to update your checksums for all files in /boot.\n\nWould you like to update your checksums now?"
      else
        TEXT="The following files failed the verification process AFTER package updates ran:\n${CHANGED_FILES}\n\nThis might be due to the following package updates:\n$LAST_PACKAGE_LIST.\n\nYou will need to update your checksums for all files in /boot.\n\nWould you like to update your checksums now?"
      fi

    else
      if [ $CHANGED_FILES_COUNT -gt 10 ]; then
        # drop to console to show full file list
        whiptail $ERROR_BG_COLOR --title 'ERROR: Boot Hash Mismatch' \
          --msgbox "${CHANGED_FILES_COUNT} files failed the verification process!\\n\nThis could indicate a compromise!\n\nHit OK to review the list of files.\n\nType \"q\" to exit the list and return." 0 80

        echo "Type \"q\" to exit the list and return." >> /tmp/hash_output_mismatches
        less /tmp/hash_output_mismatches
        #move outdated hash mismatch list
        mv /tmp/hash_output_mismatches /tmp/hash_output_mismatch_old
        TEXT="Would you like to update your checksums now?"
      else
        TEXT="The following files failed the verification process:\n\n${CHANGED_FILES}\n\nThis could indicate a compromise!\n\nWould you like to update your checksums now?"
      fi
    fi

    if (whiptail $BG_COLOR_ERROR --title 'ERROR: Boot Hash Mismatch' --yesno "$TEXT" 0 80) then
      if update_checksums ; then
        BG_COLOR_MAIN_MENU=""
        return 0;
      else
        whiptail $BG_COLOR_ERROR --title 'ERROR' \
          --msgbox "Failed to update checksums / sign default config" 0 80
      fi
    fi
    BG_COLOR_MAIN_MENU=$BG_COLOR_ERROR
    return 1
  fi
}

prompt_update_checksums()
{
  TRACE_FUNC
  if (whiptail $BG_COLOR_WARNING --title 'Update Checksums and sign all files in /boot' \
      --yesno "You have chosen to update the checksums and sign all of the files in /boot.\n\nThis means that you trust that these files have not been tampered with.\n\nYou will need your GPG key available, and this change will modify your disk.\n\nDo you want to continue?" 0 80) then
    if ! update_checksums ; then
      whiptail $BG_COLOR_ERROR --title 'ERROR' \
        --msgbox "Failed to update checksums / sign default config" 0 80
    fi
  fi
}

generate_totp_hotp()
{
  TRACE_FUNC  
  tpm_owner_password="$1"	# May be empty, will prompt if needed and empty
  if [ "$CONFIG_TPM" != "y" ] && [ -x /bin/hotp_verification ]; then
    echo "Generating new HOTP secret"
    /bin/seal-hotpkey
  elif echo -e "Generating new TOTP secret...\n\n" && /bin/seal-totp "$BOARD_NAME" "$tpm_owner_password"; then
    echo
    if [ -x /bin/hotp_verification ]; then
      if [ "$CONFIG_TOTP_SKIP_QRCODE" != y ]; then
        echo "Once you have scanned the QR code, hit Enter to configure your HOTP USB Security Dongle (e.g. Librem Key or Nitrokey)"
        read
      fi
      /bin/seal-hotpkey
    else
      if [ "$CONFIG_TOTP_SKIP_QRCODE" != y ]; then
        echo "Once you have scanned the QR code, hit Enter to continue"
        read
      fi
    fi
    # clear screen
    printf "\033c"
  else
    warn "Unsealing TOTP/HOTP secret from previous sealed measurements failed"
    warn 'Try "Generate new HOTP/TOTP secret" option if you updated firmware content'
  fi
}

update_totp()
{
  TRACE_FUNC
  # update the TOTP code
  date=`date "+%Y-%m-%d %H:%M:%S %Z"`
  tries=0
  if [ "$CONFIG_TPM" != "y" ]; then
    TOTP="NO TPM"
  else
    TOTP=`unseal-totp`
    # On platforms using CONFIG_BOOT_EXTRA_TTYS multiple processes may try to
    # access TPM at the same time, failing with EBUSY. The order of execution
    # is unpredictable, so the error may appear on main console, secondary one,
    # or neither of them if the calls are sufficiently staggered. Try up to
    # three times (including previous one) with small delays in case of error,
    # instead of immediately scaring users with "you've been pwned" message.
    while [ $? -ne 0 ] && [ $tries -lt 2 ]; do
      sleep 0.5
      ((tries++))
      TOTP=`unseal-totp`
    done
    if [ $? -ne 0 ]; then
      BG_COLOR_MAIN_MENU=$BG_COLOR_ERROR
      if [ "$skip_to_menu" = "true" ]; then
        return 1  # Already asked to skip to menu from a prior error
      fi
      
      DEBUG "CONFIG_TPM: $CONFIG_TPM"
      DEBUG "CONFIG_TPM2_TOOLS: $CONFIG_TPM2_TOOLS"
      DEBUG "Show PCRs"
      DEBUG "$(pcrs)"

      whiptail $BG_COLOR_ERROR --title "ERROR: TOTP Generation Failed!" \
        --menu "    ERROR: $CONFIG_BRAND_NAME couldn't generate the TOTP code.\n
  If you have just completed a Factory Reset, or just reflashed
  your BIOS, you should generate a new HOTP/TOTP secret.\n
  If this is the first time the system has booted, you should
  reset the TPM and set your own password.\n
  If you have not just reflashed your BIOS, THIS COULD INDICATE TAMPERING!\n
  How would you like to proceed?" 0 80 4 \
        'g' ' Generate new HOTP/TOTP secret' \
        'i' ' Ignore error and continue to main menu' \
        'p' ' Reset the TPM' \
        'x' ' Exit to recovery shell' \
        2>/tmp/whiptail || recovery "GUI menu failed"

      option=$(cat /tmp/whiptail)
      case "$option" in 
        g )
          if (whiptail $BG_COLOR_WARNING --title 'Generate new TOTP/HOTP secret' \
              --yesno "This will erase your old secret and replace it with a new one!\n\nDo you want to proceed?" 0 80) then
            generate_totp_hotp && update_totp && BG_COLOR_MAIN_MENU="" && reseal_tpm_disk_decryption_key
          fi
          ;;
        i )
          skip_to_menu="true"
          return 1
          ;;
        p )
          reset_tpm && update_totp && BG_COLOR_MAIN_MENU="" && reseal_tpm_disk_decryption_key
          ;;
        x )
          recovery "User requested recovery shell"
          ;;
      esac
    fi
  fi
}

update_hotp()
{
  TRACE_FUNC
  HOTP="Unverified"
  if [ -x /bin/hotp_verification ]; then
    if ! hotp_verification info ; then
      if [ "$skip_to_menu" = "true" ]; then
        return 1  # Already asked to skip to menu from a prior error
      fi
      if ! whiptail $BG_COLOR_WARNING \
          --title "WARNING: Please Insert Your $HOTPKEY_BRANDING" \
          --yes-button "Retry" --no-button "Skip" \
          --yesno "Your $HOTPKEY_BRANDING was not detected.\n\nPlease insert your $HOTPKEY_BRANDING" 0 80 ; then
        HOTP="Error checking code, Insert $HOTPKEY_BRANDING and retry"
        BG_COLOR_MAIN_MENU=$BG_COLOR_WARNING
        return
      fi
    fi
    HOTP=`unseal-hotp`
    # Don't output HOTP codes to screen, so as to make replay attacks harder
    hotp_verification check "$HOTP"
    case "$?" in
      0 )
        HOTP="Success"
        BG_COLOR_MAIN_MENU=""
      ;;
      4|7 )	# 4: code was incorrect, 7: code was not a valid HOTP code at all
        HOTP="Invalid code"
        BG_COLOR_MAIN_MENU=$BG_COLOR_ERROR
      ;;
      * )
        HOTP="Error checking code, Insert $HOTPKEY_BRANDING and retry"
        BG_COLOR_MAIN_MENU=$BG_COLOR_WARNING
      ;;
    esac
  else
    HOTP='N/A'
  fi

  if [[ "$CONFIG_TPM" = n && "$HOTP" = "Invalid code" ]]; then
    whiptail $BG_COLOR_ERROR --title "ERROR: HOTP Validation Failed!" \
      --menu "ERROR: $CONFIG_BRAND_NAME couldn't validate the HOTP code.\n\nIf you just reflashed your BIOS, you should generate a new TOTP/HOTP secret.\n\nIf you have not just reflashed your BIOS, THIS COULD INDICATE TAMPERING!\n\nHow would you like to proceed?" 0 80 4 \
      'g' ' Generate new TOTP/HOTP secret' \
      'i' ' Ignore error and continue to main menu' \
      'x' ' Exit to recovery shell' \
      2>/tmp/whiptail || recovery "GUI menu failed"

    option=$(cat /tmp/whiptail)
    case "$option" in 
      g )
        if (whiptail $BG_COLOR_WARNING --title 'Generate new TOTP/HOTP secret' \
            --yesno "This will erase your old secret and replace it with a new one!\n\nDo you want to proceed?" 0 80) then
          generate_totp_hotp && BG_COLOR_MAIN_MENU="" && reseal_tpm_disk_decryption_key
        fi
        ;;
      i )
        return 1
        ;;
      x )
        recovery "User requested recovery shell"
        ;;
    esac
  fi
}

clean_boot_check()
{
  TRACE_FUNC
  # assume /boot mounted
  if ! grep -q /boot /proc/mounts ; then
    return
  fi

  # check for any kexec files in /boot
  kexec_files=`find /boot -name kexec*.txt`
  [ ! -z "$kexec_files" ] && return
  
  #check for GPG key in keyring
  GPG_KEY_COUNT=`gpg -k 2>/dev/null | wc -l`
  [ $GPG_KEY_COUNT -ne 0 ] && return

   # check for USB security token
  if [ -x /bin/hotp_verification ]; then
    if ! gpg --card-status > /dev/null ; then
      return
    fi
  fi

  # OS is installed, no kexec files present, no GPG keys in keyring, security token present
  # prompt user to run OEM factory reset
  oem-factory-reset \
    "Clean Boot Detected - Perform OEM Factory Reset / Re-Ownership?" "$BG_COLOR_WARNING"
}

check_gpg_key()
{
  TRACE_FUNC
  GPG_KEY_COUNT=`gpg -k 2>/dev/null | wc -l`
  if [ $GPG_KEY_COUNT -eq 0 ]; then
    BG_COLOR_MAIN_MENU=$BG_COLOR_ERROR
    if [ "$skip_to_menu" = "true" ]; then
      return 1  # Already asked to skip to menu from a prior error
    fi
    whiptail $BG_COLOR_ERROR --title "ERROR: GPG keyring empty!" \
      --menu "ERROR: $CONFIG_BRAND_NAME couldn't find any GPG keys in your keyring.\n\nIf this is the first time the system has booted,\nyou should add a public GPG key to the BIOS now.\n\nIf you just reflashed a new BIOS, you'll need to add at least one\npublic key to the keyring.\n\nIf you have not just reflashed your BIOS, THIS COULD INDICATE TAMPERING!\n\nHow would you like to proceed?" 0 80 4 \
      'g' ' Add a GPG key to the running BIOS' \
      'F' ' OEM Factory Reset / Re-Ownership' \
      'i' ' Ignore error and continue to main menu' \
      'x' ' Exit to recovery shell' \
      2>/tmp/whiptail || recovery "GUI menu failed"

    option=$(cat /tmp/whiptail)
    case "$option" in 
      g )
        gpg-gui.sh && BG_COLOR_MAIN_MENU=""
        ;;
      i )
        skip_to_menu="true"
        return 1
        ;;
      F )
      oem-factory-reset
      ;;

      x )
        recovery "User requested recovery shell"
        ;;
    esac
  fi
}

prompt_auto_default_boot()
{
  TRACE_FUNC
  echo -e "\nHOTP verification success\n\n"
  if pause_automatic_boot; then
    echo -e "\n\nAttempting default boot...\n\n"
    attempt_default_boot
  fi
}

show_main_menu()
{
  TRACE_FUNC
  date=`date "+%Y-%m-%d %H:%M:%S %Z"`
  whiptail $BG_COLOR_MAIN_MENU --title "$MAIN_MENU_TITLE" \
    --menu "$date\nTOTP: $TOTP | HOTP: $HOTP" 0 80 10 \
    'd' ' Default boot' \
    'r' ' Refresh TOTP/HOTP' \
    'o' ' Options -->' \
    's' ' System Info' \
    'p' ' Power Off' \
    2>/tmp/whiptail || recovery "GUI menu failed"

  option=$(cat /tmp/whiptail)
  case "$option" in 
    d )
      attempt_default_boot
      ;;
    r )
      update_totp && update_hotp
      ;;
    o )
      show_options_menu
      ;;
    s )
      show_system_info
      ;;
    p )
      poweroff
      ;;
  esac
}

show_options_menu()
{
  TRACE_FUNC
  whiptail $BG_COLOR_MAIN_MENU --title "$CONFIG_BRAND_NAME Options" \
    --menu "" 0 80 10 \
    'b' ' Boot Options -->' \
    't' ' TPM/TOTP/HOTP Options -->' \
    'u' ' Update checksums and sign all files in /boot' \
    'c' ' Change configuration settings -->' \
    'f' ' Flash/Update the BIOS -->' \
    'g' ' GPG Options -->' \
    'F' ' OEM Factory Reset / Re-Ownership -->' \
    'C' ' Reencrypt LUKS container -->' \
    'P' ' Change LUKS Disk Recovery Key passphrase ->' \
    'R' ' Check/Update file hashes on root disk -->' \
    'x' ' Exit to recovery shell' \
    'r' ' <-- Return to main menu' \
    2>/tmp/whiptail || recovery "GUI menu failed"

  option=$(cat /tmp/whiptail)
  case "$option" in 
    b )
      show_boot_options_menu
      ;;
    t )
      show_tpm_totp_hotp_options_menu
      ;;
    u )
      prompt_update_checksums
      ;;
    c )
      config-gui.sh
      ;;
    f )
      flash-gui.sh
      ;;
    g )
      gpg-gui.sh
      ;;
    F )
      oem-factory-reset
      ;;
    C )
      luks_reencrypt
      luks_secrets_cleanup
      ;;
    P )
      luks_change_passphrase
      luks_secrets_cleanup
      ;;
    R )
      root-hashes-gui.sh
      ;;
    x )
      recovery "User requested recovery shell"
      ;;
    r )
      ;;
  esac
}

show_boot_options_menu()
{
  TRACE_FUNC
  whiptail $BG_COLOR_MAIN_MENU --title "Boot Options" \
    --menu "Select A Boot Option" 0 80 10 \
    'm' ' Show OS boot menu' \
    'u' ' USB boot' \
    'i' ' Ignore tampering and force a boot (Unsafe!)' \
    'r' ' <-- Return to main menu' \
    2>/tmp/whiptail || recovery "GUI menu failed"

  option=$(cat /tmp/whiptail)
  case "$option" in 
    m )
      # select a kernel from the menu
      select_os_boot_option
      ;;
    u )
      exec /bin/usb-init
      ;;
    i )
      force_unsafe_boot
      ;;
    r )
      ;;
  esac
}

show_tpm_totp_hotp_options_menu()
{
  TRACE_FUNC
  whiptail $BG_COLOR_MAIN_MENU --title "TPM/TOTP/HOTP Options" \
    --menu "Select An Option" 0 80 10 \
    'g' ' Generate new TOTP/HOTP secret' \
    'r' ' Reset the TPM' \
    't' ' TOTP/HOTP does not match after refresh, troubleshoot' \
    'm' ' <-- Return to main menu' \
    2>/tmp/whiptail || recovery "GUI menu failed"

  option=$(cat /tmp/whiptail)
  case "$option" in 
    g )
      generate_totp_hotp && reseal_tpm_disk_decryption_key
      ;;
    r )
      reset_tpm && reseal_tpm_disk_decryption_key
      ;;
    t )
      prompt_totp_mismatch
      ;;
    m )
      ;;
  esac
}

prompt_totp_mismatch()
{
  TRACE_FUNC
  if (whiptail $BG_COLOR_WARNING --title "TOTP/HOTP code mismatched" \
    --yesno "TOTP/HOTP code mismatches could indicate either TPM tampering or clock drift:\n\nTo correct clock drift: 'date -s yyyy-MM-DD hh:mm:ss' in UTC timezone\nand save it to the RTC: 'hwclock -w'\nthen reboot and try again.\n\nWould you like to exit to a recovery console?" 0 80) then
    echo ""
    echo "To correct clock drift: 'date -s yyyy-MM-DD hh:mm:ss' in UTC timezone"
    echo "and save it to the RTC: 'hwclock -w'"
    echo ""
    echo "Alternatively you could do this automatically with an Ethernet cable connected to a functional network: 'network-init-recovery'"
    echo ""
    echo "Then reboot and try again"
    echo ""
    recovery "TOTP/HOTP mismatch"
  fi
}

reset_tpm()
{
  TRACE_FUNC
  if [ "$CONFIG_TPM" = "y" ]; then
    if (whiptail $BG_COLOR_WARNING --title 'Reset the TPM' \
        --yesno "This will clear the TPM and TPM password, replace them with new ones!\n\nDo you want to proceed?" 0 80) then

      if ! prompt_new_owner_password; then
        echo "Press Enter to return to the menu..."
        read
        echo
        return 1
      fi

      tpmr reset "$tpm_owner_password"

      # now that the TPM is reset, remove invalid TPM counter files
      mount_boot
      mount -o rw,remount /boot
      warn "Removing rollback and primary handle hash under /boot"
      rm -f /boot/kexec_rollback.txt
      rm -f /boot/kexec_primhdl_hash.txt

      # create Heads TPM counter before any others
      check_tpm_counter /boot/kexec_rollback.txt "" "$tpm_owner_password" \
      || die "Unable to find/create tpm counter"
      counter="$TPM_COUNTER"

      increment_tpm_counter $counter \
      || die "Unable to increment tpm counter"

      sha256sum /tmp/counter-$counter > /boot/kexec_rollback.txt \
      || die "Unable to create rollback file"
      mount -o ro,remount /boot

      generate_totp_hotp "$tpm_owner_password"
    else
      echo "Returning to the main menu"
    fi
  else
    whiptail $BG_COLOR_ERROR --title 'ERROR: No TPM Detected' --msgbox "This device does not have a TPM.\n\nPress OK to return to the Main Menu" 0 80
  fi
}

select_os_boot_option()
{
  TRACE_FUNC
  mount_boot
  if verify_global_hashes ; then
    kexec-select-boot -m -b /boot -c "grub.cfg" -g
  fi
}

attempt_default_boot()
{
  TRACE_FUNC
  mount_boot
    
  if ! verify_global_hashes; then
    return
  fi
  DEFAULT_FILE=`find /boot/kexec_default.*.txt 2>/dev/null | head -1`
  if [ -r "$DEFAULT_FILE" ]; then
    kexec-select-boot -b /boot -c "grub.cfg" -g \
    || recovery "Failed default boot"
  elif (whiptail $BG_COLOR_WARNING --title 'No Default Boot Option Configured' \
        --yesno "There is no default boot option configured yet.\nWould you like to load a menu of boot options?\nOtherwise you will return to the main menu." 0 80) then
    kexec-select-boot -m -b /boot -c "grub.cfg" -g
  fi
}

force_unsafe_boot()
{
  TRACE_FUNC
  if [ "$CONFIG_RESTRICTED_BOOT" = y ]; then
      whiptail $BG_COLOR_ERROR --title 'ERROR: Restricted Boot Enabled' --msgbox "Restricted Boot is Enabled, forced boot not allowed.\n\nPress OK to return to the Main Menu" 0 80
      return
  fi
  # Run the menu selection in "force" mode, bypassing hash checks
  if (whiptail $BG_COLOR_WARNING --title 'Unsafe Forced Boot Selected!' \
      --yesno "WARNING: You have chosen to skip all tamper checks and boot anyway.\n\nThis is an unsafe option!\n\nDo you want to proceed?" 0 80) then
    mount_boot && kexec-select-boot -m -b /boot -c "grub.cfg" -g -f
  fi
}

# gui-init start
TRACE_FUNC

# Use stored HOTP key branding
if [ -r /boot/kexec_hotp_key ]; then
	HOTPKEY_BRANDING="$(cat /boot/kexec_hotp_key)"
else
	HOTPKEY_BRANDING="HOTP USB Security Dongle"
fi

if [ -x /bin/hotp_verification ]; then
  enable_usb
fi

if detect_boot_device ; then
  # /boot device with installed OS found
  clean_boot_check
else
  # can't determine /boot device or no OS installed, 
  # so fall back to interactive selection
  mount_boot
fi

# detect whether any GPG keys exist in the keyring, if not, initialize that first
check_gpg_key
# Even if GPG init fails, still try to update TOTP/HOTP so the main menu can
# show the correct status.
update_totp
update_hotp

if [ "$HOTP" = "Success" -a -n "$CONFIG_AUTO_BOOT_TIMEOUT" ]; then
  prompt_auto_default_boot
fi

while true; do
  TRACE_FUNC
  skip_to_menu="false"
  show_main_menu
done

recovery "Something failed during boot"