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448 lines
20 KiB
Bash
448 lines
20 KiB
Bash
#!/bin/bash
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# LUKS related functions
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. /etc/functions
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. /etc/gui_functions
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. /tmp/config
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#List all LUKS devices on the system
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list_luks_devices() {
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#generate a list of devices to choose from that contain a LUKS header
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lvm vgscan || true
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blkid | cut -d ':' -f 1 | while read device; do
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if cryptsetup isLuks $device; then echo $device; fi
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done | sort
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}
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#Whiptail prompt asking user to select ratio of device to use for LUKS container between: 25, 50, 75
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select_luks_container_size_percent() {
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TRACE_FUNC
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if [ -x /bin/whiptail ]; then
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#whiptail prompt asking user to select ratio of device to use for LUKS container between: 25, 50, 75
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#whiptail returns the percentage of the device to use for LUKS container
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whiptail --title "Select LUKS container size percentage of device" --menu \
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"Select LUKS container size percentage of device:" 0 80 10 \
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"10" "10%" \
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"25" "25%" \
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"50" "50%" \
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"75" "75%" \
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2> /tmp/luks_container_size_percent \
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|| die "Error selecting LUKS container size percentage of device"
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else
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#console prompt asking user to select ratio of device to use for LUKS container between: 10, 25, 50, 75
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#console prompt returns the percentage of the device to use for LUKS container
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echo "Select LUKS container size percentage of device:"
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echo "1. 10%"
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echo "2. 25%"
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echo "3. 50%"
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echo "4. 75%"
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read -p "Choose your LUKS container size percentage of device [1-3]: " option_index
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if [ "$option_index" = "1" ]; then
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echo "10" > /tmp/luks_container_size_percent
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elif [ "$option_index" = "2" ]; then
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echo "25" > /tmp/luks_container_size_percent
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elif [ "$option_index" = "3" ]; then
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echo "50" > /tmp/luks_container_size_percent
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elif [ "$option_index" = "4" ]; then
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echo "75" > /tmp/luks_container_size_percent
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else
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die "Error selecting LUKS container size percentage of device"
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fi
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fi
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}
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# Partition a device interactively with two partitions: a LUKS container
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# containing private ext4 partition and second public exFAT partition
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# Size provisioning is done by percentage of the device
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interactive_prepare_thumb_drive()
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{
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TRACE_FUNC
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#Refactoring: only one parameter needed to be prompted for: the passphrase for LUKS container if not coming from oem-provisioning
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#If no passphrase was provided, ask user to select passphrase for LUKS container
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# if no device provided as parameter, we will ask user to select device to partition
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# if no percentage provided as parameter, we will default to 10% of device to use for LUKS container
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# we will validate parameters and not make them positional and print a usage function first
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#Set defaults
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DEVICE="" #Will list all usb storage devices if not provided as parameter
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PERCENTAGE="10" #default to 10% of device to use for LUKS container (requires a LUKS partition bigger then 32mb!)
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PASSPHRASE="" #Will prompt user for passphrase if not provided as parameter
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#Parse parameters
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while [ $# -gt 0 ]; do
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case "$1" in
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--device)
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DEVICE=$2
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shift 2
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;;
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--percentage)
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PERCENTAGE=$2
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shift 2
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;;
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--pass)
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PASSPHRASE=$2
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shift 2
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;;
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*)
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echo "usage: prepare_thumb_drive [--device device] [--percentage percentage] [--pass passphrase]"
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return 1
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;;
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esac
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done
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DEBUG "DEVICE to partition: $DEVICE"
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DEBUG "PERCENTAGE of device that will be used for LUKS container: $PERCENTAGE"
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#Output provided if passphrase is provided as parameter
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DEBUG "PASSPHRASE for LUKS container: ${PASSPHRASE:+provided}"
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#Prompt for passphrase if not provided as parameter
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if [ -z "$PASSPHRASE" ]; then
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#If no passphrase was provided, ask user to select passphrase for LUKS container
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#console based no whiptail
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while [[ ${#PASSPHRASE} -lt 8 ]]; do
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{
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echo -e "\nEnter passphrase for LUKS container (At least 8 characters long):"
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#hide passphrase input from read command
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read -r -s PASSPHRASE
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#skip confirmation if passphrase is less then 8 characters long (continue)
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if [[ ${#PASSPHRASE} -lt 8 ]]; then
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echo -e "\nPassphrase must be at least 8 characters long. Please try again."
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unset PASSPHRASE
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continue
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fi
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#validate passphrase and ask user to re-enter if not at least 8 characters long
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#confirm passphrase
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echo -e "\nConfirm passphrase for LUKS container:"
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#hide passphrase input from read command
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read -r -s PASSPHRASE_CONFIRM
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#compare passphrase and passphrase confirmation
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if [ "$PASSPHRASE" != "$PASSPHRASE_CONFIRM" ]; then
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echo -e "\nPassphrases do not match. Please try again."
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unset PASSPHRASE
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unset PASSPHRASE_CONFIRM
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fi
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};done
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fi
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#If no device was provided, ask user to select device to partition
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if [ -z "$DEVICE" ]; then
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#warn user to disconnect all external drives
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if [ -x /bin/whiptail ]; then
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whiptail_warning --title "WARNING: Disconnect all external drives" --msgbox \
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"WARNING: Please disconnect all external drives before proceeding.\n\nHit Enter to continue." 0 80 \
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|| die "User cancelled wiping and repartitioning of $DEVICE"
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else
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echo -e -n "Warning: Please disconnect all external drives before proceeding.\n\nHit Enter to continue?"
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read -r -p " [Y/n] " response
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#transform response to uppercase with bash parameter expansion
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response=${response^^}
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#continue if response different then uppercase N
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if [[ $response =~ ^(N)$ ]]; then
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die "User cancelled wiping and repartitioning of $DEVICE"
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fi
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fi
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#enable usb
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enable_usb
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#enable usb storage
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enable_usb_storage
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#list all usb storage devices
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list_usb_storage disks > /tmp/devices.txt
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if [ $(cat /tmp/devices.txt | wc -l) -gt 0 ]; then
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file_selector "/tmp/devices.txt" "Select device to partition"
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if [ "$FILE" == "" ]; then
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die "Error: No device selected"
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else
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DEVICE=$FILE
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fi
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else
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die "Error: No device found"
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fi
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fi
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#Check if device is a block device
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if [ ! -b $DEVICE ]; then
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die "Error: $DEVICE is not a block device"
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fi
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if [ -z "$PERCENTAGE" ]; then
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#If no percentage was provided, ask user to select percentage of device to use for LUKS container
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select_luks_container_size_percent
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PERCENTAGE=$(cat /tmp/luks_container_size_percent)
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fi
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confirm_thumb_drive_format "$DEVICE" "$PERCENTAGE" ||
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die "User cancelled wiping and repartitioning of $DEVICE"
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prepare_thumb_drive "$DEVICE" "$PERCENTAGE" "$PASSPHRASE"
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}
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# Show a prompt to confirm formatting a flash drive with a percentage allocated
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# to LUKS. interactive_prepare_thumb_drive() uses this; during OEM reset it is
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# used separately before performing any reset actions
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#
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# parameters:
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# $1 - block device of flash drive
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# $2 - percent of device allocated to LUKS [1-99]
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confirm_thumb_drive_format()
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{
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TRACE_FUNC
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local DEVICE LUKS_PERCENTAGE DISK_SIZE_BYTES DISK_SIZE_DISPLAY LUKS_PERCENTAGE LUKS_SIZE_MB MSG
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DEVICE="$1"
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LUKS_PERCENTAGE="$2"
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LUKS_SIZE_MB=
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#Get disk size in bytes
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DISK_SIZE_BYTES="$(blockdev --getsize64 "$DEVICE")"
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DISK_SIZE_DISPLAY="$(display_size "$DISK_SIZE_BYTES")"
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#Convert disk size to MB
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DISK_SIZE_MB=$((DISK_SIZE_BYTES/1024/1024))
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#Calculate percentage of device in MB
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LUKS_SIZE_MB="$((DISK_SIZE_BYTES*LUKS_PERCENTAGE/100/1024/1024))"
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MSG="WARNING: Wiping and repartitioning $DEVICE ($DISK_SIZE_DISPLAY) with $LUKS_SIZE_MB MB\n assigned to private LUKS ext4 partition,\n rest assigned to exFAT public partition.\n\nAre you sure you want to continue?"
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if [ -x /bin/whiptail ]; then
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whiptail_warning --title "WARNING: Wiping and repartitioning $DEVICE ($DISK_SIZE_DISPLAY)" --yesno \
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"$MSG" 0 80
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else
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echo -e -n "$MSG"
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read -r -p " [Y/n] " response
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#transform response to uppercase with bash parameter expansion
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response=${response^^}
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#continue if response is Y, y, or empty, abort for anything else
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if [ -n "$response" ] && [ "${response^^}" != Y ]; then
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return 1
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fi
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fi
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}
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# Prepare a flash drive with a private LUKS-encrypted ext4 partition and a
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# public exFAT partition. This is not interactive - during OEM reset, any
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# selections/confirmations must occur before OEM reset starts resetting the
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# system.
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#
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# $1 - block device of flash drive
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# $2 - percentage of flash drive to allocate to LUKS [1-99]
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# $3 - passphrase for LUKS container
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prepare_thumb_drive()
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{
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TRACE_FUNC
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local DEVICE PERCENTAGE PASSPHRASE DISK_SIZE_BYTES PERCENTAGE_MB
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DEVICE="$1"
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PERCENTAGE="$2"
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PASSPHRASE="$3"
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#Get disk size in bytes
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DISK_SIZE_BYTES="$(blockdev --getsize64 "$DEVICE")"
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#Calculate percentage of device in MB
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PERCENTAGE_MB="$((DISK_SIZE_BYTES*PERCENTAGE/100/1024/1024))"
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echo -e "Preparing $DEVICE with $PERCENTAGE_MB MB for private LUKS container while rest of device will be assigned to exFAT public partition...\n"
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echo "Please wait..."
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DEBUG "Creating empty DOS partition table on device through fdisk to start clean"
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echo -e "o\nw\n" | fdisk $DEVICE >/dev/null 2>&1 || die "Error creating partition table"
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DEBUG "partition device with two partitions: first one being the percent applied and rest for second partition through fdisk"
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echo -e "n\np\n1\n\n+"$PERCENTAGE_MB"M\nn\np\n2\n\n\nw\n" | fdisk $DEVICE >/dev/null 2>&1 || die "Error partitioning device"
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DEBUG "cryptsetup luksFormat first partition with LUKS container aes-xts-plain64 cipher with sha256 hash and 512 bit key"
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DEBUG "Creating ${PERCENTAGE_MB}MB LUKS container on ${DEVICE}1..."
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DO_WITH_DEBUG cryptsetup --batch-mode -c aes-xts-plain64 -h sha256 -s 512 -y luksFormat ${DEVICE}1 \
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--key-file <(echo -n "${PASSPHRASE}") > /dev/null 2>&1 \
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|| die "Error formatting LUKS container"
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DEBUG "Opening LUKS device and mapping under /dev/mapper/private..."
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DO_WITH_DEBUG cryptsetup open ${DEVICE}1 private --key-file <(echo -n "${PASSPHRASE}") > /dev/null 2>&1 \
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|| die "Error opening LUKS container"
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DEBUG "Formatting LUKS container mapped under /dev/mapper/private as an ext4 partition..."
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mke2fs -t ext4 -L private /dev/mapper/private >/dev/null 2>&1 || die "Error formatting LUKS container's ext4 filesystem"
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DEBUG "Closing LUKS device /dev/mapper/private..."
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cryptsetup close private > /dev/null 2>&1 || die "Error closing LUKS container"
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DEBUG "Formatting second partition ${DEVICE}2 with exfat filesystem..."
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mkfs.exfat -L public ${DEVICE}2 >/dev/null 2>&1 || die "Error formatting second partition with exfat filesystem"
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echo "Done."
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}
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select_luks_container()
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{
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TRACE_FUNC
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if [ -s /boot/kexec_key_devices.txt ]; then
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DEBUG "Reusing known good LUKS container device from /boot/kexec_key_devices.txt"
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DEBUG "LUKS container device: $(cut -d ' ' -f1 /boot/kexec_key_devices.txt)"
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LUKS=$(cut -d ' ' -f1 /boot/kexec_key_devices.txt)
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else
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list_luks_devices > /tmp/luks_devices.txt
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#if /tmp/luks_devices.txt exists and is not empty
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if [ -s /tmp/luks_devices.txt ]; then
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file_selector "/tmp/luks_devices.txt" "Select LUKS container device"
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if [ "$FILE" == "" ]; then
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return 1
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else
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LUKS=$FILE
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detect_boot_device
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mount -o remount,rw /boot
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echo "$LUKS $(cryptsetup luksUUID $LUKS)" >/boot/kexec_key_devices.txt
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mount -o remount,ro /boot
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fi
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else
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warn "No encrypted device found"
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return 1
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fi
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fi
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}
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test_luks_current_disk_recovery_key_passphrase()
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{
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TRACE_FUNC
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while :; do
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select_luks_container || return 1
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if [ -z "$luks_current_Disk_Recovery_Key_passphrase" ]; then
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#if no external provisioning provides current LUKS Disk Recovery Key passphrase
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echo -e "\nEnter the current LUKS Disk Recovery Key passphrase (Configured at OS installation or by OEM):"
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read -r luks_current_Disk_Recovery_Key_passphrase
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echo -n "$luks_current_Disk_Recovery_Key_passphrase" >/tmp/luks_current_Disk_Recovery_Key_passphrase
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warn "Testing opening "$LUKS" LUKS encrypted drive content with the current LUKS Disk Recovery Key passphrase..."
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cryptsetup open $LUKS test --key-file /tmp/luks_current_Disk_Recovery_Key_passphrase
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else
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echo -n "$luks_current_Disk_Recovery_Key_passphrase" >/tmp/luks_current_Disk_Recovery_Key_passphrase
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warn "Testing opening "$LUKS" LUKS encrypted drive content with the current LUKS Disk Recovery Key passphrase..."
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cryptsetup open $LUKS test --key-file /tmp/luks_current_Disk_Recovery_Key_passphrase
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fi
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#Validate past cryptsetup-reencrypt attempts
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if [ $? -eq 0 ]; then
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whiptail --title 'Invalid Actual LUKS Disk Recovery Key passphrase?' --msgbox \
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"If you previously changed it and do not remember it, you will have to\n reinstall the OS from a an external drive.\n\nTo do so, place the ISO file and its signature file on root of an\n external drive, and select Options-> Boot from USB \n\nHit Enter to retry." 30 60
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shred -n 10 -z -u /tmp/luks_current_Disk_Recovery_Key_passphrase 2>/dev/null
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#unsetting luks_current_Disk_Recovery_Key_passphrase so we prompt for it again LUKS Disk Recovery Key passphrase prompt on next round
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unset luks_current_Disk_Recovery_Key_passphrase
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#remove "known good" selected LUKS container so that next pass asks again user to select LUKS container.
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#maybe the container was not the right one
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detect_boot_device
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mount -o remount,rw /boot
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rm -f /boot/kexec_key_devices.txt
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mount -o remount,ro /boot
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else
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#LuksOpen test was successful. Cleanup should be called only when done
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#Exporting successfully used passphrase possibly reused by oem-factory-reset
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#We close the volume
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cryptsetup close test
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export luks_current_Disk_Recovery_Key_passphrase
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break;
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fi
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done
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}
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luks_reencrypt() {
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TRACE_FUNC
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while :; do
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select_luks_container || return 1
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#If the user just set a new LUKS Disk Recovery Key passphrase
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if [ -n "$luks_new_Disk_Recovery_Key_passphrase" ]; then
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luks_current_Disk_Recovery_Key_passphrase="$luks_new_Disk_Recovery_Key_passphrase"
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fi
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if [ -z "$luks_current_Disk_Recovery_Key_passphrase" ]; then
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#if no external provisioning provides current LUKS Disk Recovery Key passphrase
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msg=$(echo -e "This will replace the encrypted container content and its LUKS Disk Recovery Key.\n\nThe passphrase associated with this key will be asked from the user under the following conditions:\n 1-Every boot if no Disk Unlock Key was added to the TPM\n 2-If the TPM fails (hardware failure)\n 3-If the firmware has been tampered with/modified by the user\n\nThis process requires you to type the current LUKS Disk Recovery Key passphrase and will delete the LUKS TPM Disk Unlock Key slot, if set up, by setting a default boot LUKS key slot (1) if present.\n\nAt the next prompt, you may be asked to select which file corresponds to the LUKS device container.\n\nHit Enter to continue." | fold -w 70 -s)
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whiptail --title 'Reencrypt LUKS encrypted container ?' \
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--msgbox "$msg" 0 80
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echo -e "\nEnter the current LUKS Disk Recovery Key passphrase:"
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read -r luks_current_Disk_Recovery_Key_passphrase
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echo -n "$luks_current_Disk_Recovery_Key_passphrase" >/tmp/luks_current_Disk_Recovery_Key_passphrase
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warn "Reencrypting "$LUKS" LUKS encrypted drive content with a new LUKS Disk Recovery Key. Do NOT shut down or reboot!"
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cryptsetup-reencrypt -B 64 --use-directio "$LUKS" --key-slot 0 --key-file /tmp/luks_current_Disk_Recovery_Key_passphrase
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else
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echo -n "$luks_current_Disk_Recovery_Key_passphrase" >/tmp/luks_current_Disk_Recovery_Key_passphrase
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warn "Reencrypting "$LUKS" LUKS encrypted drive content with a new LUKS Disk Recovery Key. Do NOT shut down or reboot!"
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cryptsetup-reencrypt -B 64 --use-directio "$LUKS" --key-slot 0 --key-file /tmp/luks_current_Disk_Recovery_Key_passphrase
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fi
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#Validate past cryptsetup-reencrypt attempts
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if [ $(echo $?) -ne 0 ]; then
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whiptail --title 'Invalid Actual LUKS Disk Recovery Key passphrase?' --msgbox \
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"If you previously changed it and do not remember it, you will have to\n reinstall the OS from a an external drive.\n\nTo do so, place the ISO file and its signature file on root of an\n external drive, and select Options-> Boot from USB \n\nHit Enter to retry." 30 60
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shred -n 10 -z -u /tmp/luks_current_Disk_Recovery_Key_passphrase 2>/dev/null
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#unsetting luks_current_Disk_Recovery_Key_passphrase so we prompt for it again LUKS Disk Recovery Key passphrase prompt on next round
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unset luks_current_Disk_Recovery_Key_passphrase
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#remove "known good" selected LUKS container so that next pass asks again user to select LUKS container.
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#maybe the container was not the right one
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detect_boot_device
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mount -o remount,rw /boot
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rm -f /boot/kexec_key_devices.txt
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mount -o remount,ro /boot
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else
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#Reencryption was successful. Cleanup should be called only when done
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#Exporting successfully used passphrase possibly reused by oem-factory-reset
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export luks_current_Disk_Recovery_Key_passphrase
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break;
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fi
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done
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}
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luks_change_passphrase()
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{
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TRACE_FUNC
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while :; do
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select_luks_container || return 1
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#if actual or new LUKS Disk Recovery Key is not provisioned by oem-provisioning file
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if [ -z "$luks_current_Disk_Recovery_Key_passphrase" ] || [ -z "$luks_new_Disk_Recovery_Key_passphrase" ]; then
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whiptail --title 'Changing LUKS Disk Recovery Key passphrase' --msgbox \
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"Please enter the current LUKS Disk Recovery Key passphrase (slot 0).\nThen choose a strong passphrase of your own.\n\n**DICEWARE passphrase methodology is STRONGLY ADVISED.**\n\nHit Enter to continue" 30 60
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if [ -z "$luks_new_Disk_Recovery_Key_passphrase" ]; then
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echo -e "\nEnter your desired replacement for the actual LUKS Disk Recovery Key passphrase (At least 8 characters long):"
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while [[ ${#luks_new_Disk_Recovery_Key_passphrase} -lt 8 ]]; do
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{
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read -r luks_new_Disk_Recovery_Key_passphrase
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};done
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fi
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if [ -z "$luks_current_Disk_Recovery_Key_passphrase" ]; then
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echo -e "\nEnter the current LUKS Disk Recovery Key passphrase (Configured at OS installation or by OEM):"
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read -r luks_current_Disk_Recovery_Key_passphrase
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fi
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export luks_current_Disk_Recovery_Key_passphrase
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export luks_new_Disk_Recovery_Key_passphrase
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echo -n "$luks_new_Disk_Recovery_Key_passphrase" >/tmp/luks_new_Disk_Recovery_Key_passphrase
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echo -n "$luks_current_Disk_Recovery_Key_passphrase" >/tmp/luks_current_Disk_Recovery_Key_passphrase
|
|
warn "Changing "$LUKS" LUKS encrypted disk passphrase to the new LUKS Disk Recovery Key passphrase..."
|
|
cryptsetup luksChangeKey "$LUKS" --key-slot 0 --key-file=/tmp/luks_current_Disk_Recovery_Key_passphrase /tmp/luks_new_Disk_Recovery_Key_passphrase
|
|
else
|
|
#If current and new LUKS Disk Recovery Key were exported
|
|
echo -n "$luks_new_Disk_Recovery_Key_passphrase" >/tmp/luks_new_Disk_Recovery_Key_passphrase
|
|
echo -n "$luks_current_Disk_Recovery_Key_passphrase" >/tmp/luks_current_Disk_Recovery_Key_passphrase
|
|
warn "Changing "$LUKS" LUKS encrypted disk passphrase to the new LUKS Disk Recovery Key passphrase..."
|
|
cryptsetup luksChangeKey "$LUKS" --key-slot 0 --key-file=/tmp/luks_current_Disk_Recovery_Key_passphrase /tmp/luks_new_Disk_Recovery_Key_passphrase
|
|
fi
|
|
|
|
#Validate past cryptsetup attempts
|
|
if [ $(echo $?) -ne 0 ]; then
|
|
#Cryptsetup luksChangeKey was unsuccessful
|
|
whiptail --title 'Invalid LUKS passphrase?' --msgbox \
|
|
"The LUKS Disk Recovery Key passphrase was provided to you by the OEM over\n a secure communication channel.\n\nIf you previously changed it and do not remember it,\n you will have to reinstall the OS from a USB drive.\nTo do so, put OS ISO file and it's signature file on root of a USB drive,\n and select Boot from USB\n\nHit Enter to continue." 30 60
|
|
unset luks_current_Disk_Recovery_Key_passphrase
|
|
unset luks_new_Disk_Recovery_Key_passphrase
|
|
#remove "known good" selected LUKS container so that next pass asks again user to select LUKS container.
|
|
#maybe the container was not the right one
|
|
detect_boot_device
|
|
mount -o remount,rw /boot
|
|
rm -f /boot/kexec_key_devices.txt
|
|
mount -o remount,ro /boot
|
|
else
|
|
#Cryptsetup was successful.
|
|
#Cleanup should be called seperately.
|
|
#Exporting successfully used passphrase possibly reused by oem-factory-reset
|
|
export luks_new_Disk_Recovery_Key_passphrase
|
|
break;
|
|
fi
|
|
done
|
|
}
|
|
|
|
luks_secrets_cleanup()
|
|
{
|
|
#Cleanup
|
|
shred -n 10 -z -u /tmp/luks_new_Disk_Recovery_Key_passphrase 2>/dev/null || true
|
|
shred -n 10 -z -u /tmp/luks_current_Disk_Recovery_Key_passphrase 2>/dev/null || true
|
|
unset luks_current_Disk_Recovery_Key_passphrase
|
|
unset luks_new_Disk_Recovery_Key_passphrase
|
|
}
|