mirror of
https://github.com/linuxboot/heads.git
synced 2024-12-25 15:41:07 +00:00
fdbd9b2d48
When files in /boot fail hash verification, the list of files can sometimes overflow the whiptail msgbox, preventing the prompt and buttons to update checksums from showing. To mitigate this, if # of files is > 10, use less to show the file list and present a separate prompt to update the checksums once the file list has been viewed. Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>
567 lines
18 KiB
Bash
Executable File
567 lines
18 KiB
Bash
Executable File
#!/bin/sh
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# Boot from a local disk installation
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BOARD_NAME=${CONFIG_BOARD_NAME:-${CONFIG_BOARD}}
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MAIN_MENU_TITLE="${BOARD_NAME} | Heads Boot Menu"
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export BG_COLOR_MAIN_MENU=""
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. /etc/functions
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. /tmp/config
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mount_boot()
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{
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# Mount local disk if it is not already mounted
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while ! grep -q /boot /proc/mounts ; do
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# try to mount if CONFIG_BOOT_DEV exists
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if [ -e "$CONFIG_BOOT_DEV" ]; then
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mount -o ro $CONFIG_BOOT_DEV /boot
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[[ $? -eq 0 ]] && continue
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fi
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# CONFIG_BOOT_DEV doesn't exist or couldn't be mounted, so give user options
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BG_COLOR_MAIN_MENU=$BG_COLOR_ERROR
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whiptail $BG_COLOR_ERROR --clear --title "ERROR: No Bootable OS Found!" \
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--menu " No bootable OS was found on the default boot device $CONFIG_BOOT_DEV.
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How would you like to proceed?" 30 90 4 \
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'b' ' Select a new boot device' \
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'u' ' Boot from USB' \
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'm' ' Continue to the main menu' \
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'x' ' Exit to recovery shell' \
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2>/tmp/whiptail || recovery "GUI menu failed"
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option=$(cat /tmp/whiptail)
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case "$option" in
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b )
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config-gui.sh boot_device_select
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if [ $? -eq 0 ]; then
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# update CONFIG_BOOT_DEV
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. /tmp/config
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BG_COLOR_MAIN_MENU=""
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fi
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;;
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u )
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exec /bin/usb-init
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;;
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m )
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skip_to_menu="true"
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break
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;;
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* )
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recovery "User requested recovery shell"
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;;
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esac
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done
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}
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verify_global_hashes()
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{
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# Check the hashes of all the files, ignoring signatures for now
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check_config /boot force
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TMP_HASH_FILE="/tmp/kexec/kexec_hashes.txt"
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TMP_PACKAGE_TRIGGER_PRE="/tmp/kexec/kexec_package_trigger_pre.txt"
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TMP_PACKAGE_TRIGGER_POST="/tmp/kexec/kexec_package_trigger_post.txt"
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if ( cd /boot && sha256sum -c "$TMP_HASH_FILE" > /tmp/hash_output ) then
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return 0
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elif [ ! -f $TMP_HASH_FILE ]; then
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if (whiptail $BG_COLOR_ERROR --clear --title 'ERROR: Missing Hash File!' \
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--yesno "The file containing hashes for /boot is missing!\n\nIf you are setting this system up for the first time, select Yes to update\nyour list of checksums.\n\nOtherwise this could indicate a compromise and you should select No to\nreturn to the main menu.\n\nWould you like to update your checksums now?" 30 90) then
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if update_checksums ; then
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BG_COLOR_MAIN_MENU=""
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return 0;
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else
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whiptail $BG_COLOR_ERROR --title 'ERROR' \
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--msgbox "Failed to update checksums / sign default config" 16 90
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fi
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fi
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BG_COLOR_MAIN_MENU=$BG_COLOR_ERROR
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return 1
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else
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CHANGED_FILES=$(grep -v 'OK$' /tmp/hash_output | cut -f1 -d ':' | tee -a /tmp/hash_output_mismatches)
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CHANGED_FILES_COUNT=$(wc -l /tmp/hash_output_mismatches | cut -f1 -d ' ')
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# if files changed before package manager started, show stern warning
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if [ -f "$TMP_PACKAGE_TRIGGER_PRE" ]; then
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PRE_CHANGED_FILES=$(grep '^CHANGED_FILES' $TMP_PACKAGE_TRIGGER_POST | cut -f 2 -d '=' | tr -d '"')
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TEXT="The following files failed the verification process BEFORE package updates ran:\n${PRE_CHANGED_FILES}\n\nCompare against the files Heads has detected have changed:\n${CHANGED_FILES}\n\nThis could indicate a compromise!\n\nWould you like to update your checksums anyway?"
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# if files changed after package manager started, probably caused by package manager
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elif [ -f "$TMP_PACKAGE_TRIGGER_POST" ]; then
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LAST_PACKAGE_LIST=$(grep -E "^(Install|Remove|Upgrade|Reinstall):" $TMP_PACKAGE_TRIGGER_POST)
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UPDATE_INITRAMFS_PACKAGE=$(grep '^UPDATE_INITRAMFS_PACKAGE' $TMP_PACKAGE_TRIGGER_POST | cut -f 2 -d '=' | tr -d '"')
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if [ "$UPDATE_INITRAMFS_PACKAGE" != "" ]; then
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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?"
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else
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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?"
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fi
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else
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if [ $CHANGED_FILES_COUNT -gt 10 ]; then
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# drop to console to show full file list
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whiptail $ERROR_BG_COLOR --title 'ERROR: Boot Hash Mismatch' \
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--msgbox "${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." 16 60
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echo "Type \"q\" to exit the list and return." >> /tmp/hash_output_mismatches
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less /tmp/hash_output_mismatches
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#move outdated hash mismatch list
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mv /tmp/hash_output_mismatches /tmp/hash_output_mismatch_old
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TEXT="Would you like to update your checksums now?"
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else
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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?"
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fi
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fi
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if (whiptail $BG_COLOR_ERROR --clear --title 'ERROR: Boot Hash Mismatch' --yesno "$TEXT" 30 90) then
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if update_checksums ; then
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BG_COLOR_MAIN_MENU=""
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return 0;
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else
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whiptail $BG_COLOR_ERROR --title 'ERROR' \
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--msgbox "Failed to update checksums / sign default config" 16 90
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fi
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fi
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BG_COLOR_MAIN_MENU=$BG_COLOR_ERROR
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return 1
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fi
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}
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prompt_update_checksums()
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{
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if (whiptail $BG_COLOR_WARNING --title 'Update Checksums and sign all files in /boot' \
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--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?" 16 90) then
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if ! update_checksums ; then
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whiptail $BG_COLOR_ERROR --title 'ERROR' \
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--msgbox "Failed to update checksums / sign default config" 16 90
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fi
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fi
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}
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generate_totp_htop()
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{
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echo "Scan the QR code to add the new TOTP secret"
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/bin/seal-totp
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if [ -x /bin/hotp_verification ]; then
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echo "Once you have scanned the QR code, hit Enter to configure your HOTP USB Security Dongle (e.g. Librem Key or Nitrokey)"
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read
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/bin/seal-hotpkey
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else
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echo "Once you have scanned the QR code, hit Enter to continue"
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read
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fi
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}
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update_totp()
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{
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# update the TOTP code
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date=`date "+%Y-%m-%d %H:%M:%S"`
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if [ "$CONFIG_TPM" = n ]; then
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TOTP="NO TPM"
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else
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TOTP=`unseal-totp`
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if [ $? -ne 0 ]; then
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BG_COLOR_MAIN_MENU=$BG_COLOR_ERROR
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whiptail $BG_COLOR_ERROR --clear --title "ERROR: TOTP Generation Failed!" \
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--menu " ERROR: Heads couldn't generate the TOTP code.\n
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If you have just completed a Factory Reset, or just reflashed
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your BIOS, you should generate a new HOTP/TOTP secret.\n
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If this is the first time the system has booted, you should
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reset the TPM and set your own password.\n
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If you have not just reflashed your BIOS, THIS COULD INDICATE TAMPERING!\n
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How would you like to proceed?" 30 90 4 \
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'g' ' Generate new HOTP/TOTP secret' \
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'i' ' Ignore error and continue to main menu' \
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'p' ' Reset the TPM' \
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'x' ' Exit to recovery shell' \
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2>/tmp/whiptail || recovery "GUI menu failed"
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option=$(cat /tmp/whiptail)
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case "$option" in
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g )
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if (whiptail $BG_COLOR_WARNING --title 'Generate new TOTP/HOTP secret' \
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--yesno "This will erase your old secret and replace it with a new one!\n\nDo you want to proceed?" 16 90) then
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generate_totp_htop && update_totp && BG_COLOR_MAIN_MENU=""
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fi
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;;
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i )
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return 1
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;;
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p )
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reset_tpm && update_totp && BG_COLOR_MAIN_MENU=""
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;;
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x )
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recovery "User requested recovery shell"
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;;
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esac
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fi
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fi
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}
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update_hotp()
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{
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if [ -x /bin/hotp_verification ]; then
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HOTP=`unseal-hotp`
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enable_usb
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if ! hotp_verification info ; then
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if ! whiptail $BG_COLOR_WARNING --clear \
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--title "WARNING: Please Insert Your $HOTPKEY_BRANDING" \
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--yes-button "Retry" --no-button "Skip" \
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--yesno "Your $HOTPKEY_BRANDING was not detected.\n\nPlease insert your $HOTPKEY_BRANDING" 30 90 ; then
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HOTP="Error checking code, Insert $HOTPKEY_BRANDING and retry"
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BG_COLOR_MAIN_MENU=$BG_COLOR_WARNING
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return
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fi
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fi
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# Don't output HOTP codes to screen, so as to make replay attacks harder
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hotp_verification check $HOTP
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case "$?" in
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0 )
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HOTP="Success"
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BG_COLOR_MAIN_MENU=""
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;;
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4 )
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HOTP="Invalid code"
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BG_COLOR_MAIN_MENU=$BG_COLOR_ERROR
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;;
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* )
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HOTP="Error checking code, Insert $HOTPKEY_BRANDING and retry"
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BG_COLOR_MAIN_MENU=$BG_COLOR_WARNING
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;;
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esac
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else
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HOTP='N/A'
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fi
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}
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clean_boot_check()
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{
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# assume /boot mounted
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if ! grep -q /boot /proc/mounts ; then
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return
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fi
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# check for any kexec files in /boot
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kexec_files=`find /boot -name kexec*.txt`
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[ ! -z "$kexec_files" ] && return
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#check for GPG key in keyring
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GPG_KEY_COUNT=`gpg -k 2>/dev/null | wc -l`
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[ $GPG_KEY_COUNT -ne 0 ] && return
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# check for USB security token
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if [ "$CONFIG_HOTPKEY" = "y" ]; then
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enable_usb
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if ! gpg --card-status > /dev/null ; then
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return
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fi
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fi
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# OS is installed, no kexec files present, no GPG keys in keyring, security token present
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# prompt user to run OEM factory reset
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oem-factory-reset \
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"Clean Boot Detected - Perform OEM Factory Reset?" "$BG_COLOR_WARNING"
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}
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check_gpg_key()
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{
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GPG_KEY_COUNT=`gpg -k 2>/dev/null | wc -l`
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if [ $GPG_KEY_COUNT -eq 0 ]; then
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BG_COLOR_MAIN_MENU=$BG_COLOR_ERROR
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whiptail $BG_COLOR_ERROR --clear --title "ERROR: GPG keyring empty!" \
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--menu "ERROR: Heads couldn't find any GPG keys in your keyring.\n\nIf this is the first time the system has booted,\nyou should add a public GPG key to the BIOS now.\n\nIf you just reflashed a new BIOS, you'll need to add at least one\npublic key to the keyring.\n\nIf you have not just reflashed your BIOS, THIS COULD INDICATE TAMPERING!\n\nHow would you like to proceed?" 30 90 4 \
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'g' ' Add a GPG key to the running BIOS' \
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'i' ' Ignore error and continue to main menu' \
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'x' ' Exit to recovery shell' \
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2>/tmp/whiptail || recovery "GUI menu failed"
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option=$(cat /tmp/whiptail)
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case "$option" in
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g )
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gpg-gui.sh && BG_COLOR_MAIN_MENU=""
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;;
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i )
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return 1
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;;
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x )
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recovery "User requested recovery shell"
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;;
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esac
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fi
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}
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prompt_auto_default_boot()
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{
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# save IFS before changing, restore after read
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IFS_DEF=$IFS
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IFS=''
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first_pass=false
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echo -e "\nHOTP verification success\n\n"
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read -t $CONFIG_AUTO_BOOT_TIMEOUT -s -n 1 -p "Automatic boot in $CONFIG_AUTO_BOOT_TIMEOUT seconds unless interrupted by keypress... "
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if [[ $? -ne 0 ]]; then
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IFS=$IFS_DEF
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echo -e "\n\nAttempting default boot...\n\n"
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attempt_default_boot
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fi
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IFS=$IFS_DEF
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}
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show_main_menu()
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{
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date=`date "+%Y-%m-%d %H:%M"`
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whiptail $BG_COLOR_MAIN_MENU --clear --title "$MAIN_MENU_TITLE" \
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--menu "$date\nTOTP: $TOTP | HOTP: $HOTP" 20 90 10 \
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'd' ' Default boot' \
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'r' ' Refresh TOTP/HOTP' \
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'o' ' Options -->' \
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's' ' System Info' \
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'p' ' Power Off' \
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2>/tmp/whiptail || recovery "GUI menu failed"
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option=$(cat /tmp/whiptail)
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case "$option" in
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d )
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attempt_default_boot
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;;
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r )
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update_totp && update_hotp
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;;
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o )
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show_options_menu
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;;
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s )
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show_system_info
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;;
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p )
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poweroff
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;;
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esac
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}
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show_options_menu()
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{
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whiptail $BG_COLOR_MAIN_MENU --clear --title "HEADS Options" \
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--menu "" 20 90 10 \
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'b' ' Boot Options -->' \
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't' ' TPM/TOTP/HOTP Options -->' \
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'u' ' Update checksums and sign all files in /boot' \
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'c' ' Change configuration settings -->' \
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'f' ' Flash/Update the BIOS -->' \
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'g' ' GPG Options -->' \
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'F' ' OEM Factory Reset -->' \
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'x' ' Exit to recovery shell' \
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'r' ' <-- Return to main menu' \
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2>/tmp/whiptail || recovery "GUI menu failed"
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option=$(cat /tmp/whiptail)
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case "$option" in
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b )
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show_boot_options_menu
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;;
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t )
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show_tpm_totp_hotp_options_menu
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;;
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u )
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prompt_update_checksums
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;;
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c )
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config-gui.sh
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;;
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f )
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flash-gui.sh
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;;
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g )
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gpg-gui.sh
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;;
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F )
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oem-factory-reset
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;;
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x )
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recovery "User requested recovery shell"
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;;
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r )
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;;
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esac
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}
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show_boot_options_menu()
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{
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whiptail $BG_COLOR_MAIN_MENU --clear --title "Boot Options" \
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--menu "Select A Boot Option" 20 90 10 \
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'm' ' Show OS boot menu' \
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'u' ' USB boot' \
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'i' ' Ignore tampering and force a boot (Unsafe!)' \
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'r' ' <-- Return to main menu' \
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2>/tmp/whiptail || recovery "GUI menu failed"
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option=$(cat /tmp/whiptail)
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case "$option" in
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m )
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# select a kernel from the menu
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select_os_boot_option
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;;
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u )
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exec /bin/usb-init
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;;
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i )
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force_unsafe_boot
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;;
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r )
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;;
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esac
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}
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show_tpm_totp_hotp_options_menu()
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{
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whiptail $BG_COLOR_MAIN_MENU --clear --title "TPM/TOTP/HOTP Options" \
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--menu "Select An Option" 20 90 10 \
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'g' ' Generate new TOTP/HOTP secret' \
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'r' ' Reset the TPM' \
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't' ' TOTP/HOTP does not match after refresh, troubleshoot' \
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'm' ' <-- Return to main menu' \
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2>/tmp/whiptail || recovery "GUI menu failed"
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option=$(cat /tmp/whiptail)
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case "$option" in
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g )
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generate_totp_htop
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;;
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r )
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reset_tpm
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;;
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t )
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prompt_totp_mismatch
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;;
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m )
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;;
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esac
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}
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prompt_totp_mismatch()
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{
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if (whiptail $BG_COLOR_WARNING --title "TOTP/HOTP code mismatched" \
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--yesno "TOTP/HOTP code mismatches could indicate either TPM tampering or clock drift:\n\nTo correct clock drift: 'date -s HH:MM:SS'\nand save it to the RTC: 'hwclock -w'\nthen reboot and try again.\n\nWould you like to exit to a recovery console?" 30 90) then
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echo ""
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echo "To correct clock drift: 'date -s HH:MM:SS'"
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echo "and save it to the RTC: 'hwclock -w'"
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echo "then reboot and try again"
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echo ""
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recovery "TOTP/HOTP mismatch"
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fi
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}
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reset_tpm()
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{
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if [ "$CONFIG_TPM" = "y" ]; then
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if (whiptail $BG_COLOR_WARNING --title 'Reset the TPM' \
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--yesno "This will clear the TPM and TPM password, replace them with new ones!\n\nDo you want to proceed?" 16 90) then
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/bin/tpm-reset
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# now that the TPM is reset, remove invalid TPM counter files
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mount_boot
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mount -o rw,remount /boot
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rm -f /boot/kexec_rollback.txt
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# create Heads TPM counter before any others
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check_tpm_counter /boot/kexec_rollback.txt \
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|| die "Unable to find/create tpm counter"
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counter="$TPM_COUNTER"
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|
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_htop
|
|
else
|
|
echo "Returning to the main menu"
|
|
fi
|
|
else
|
|
whiptail $BG_COLOR_ERROR --clear --title 'ERROR: No TPM Detected' --msgbox "This device does not have a TPM.\n\nPress OK to return to the Main Menu" 30 90
|
|
fi
|
|
}
|
|
|
|
show_system_info()
|
|
{
|
|
battery_charge="$(print_battery_charge)"
|
|
battery_health="$(print_battery_health)"
|
|
if [ -n $battery_charge -a -n $battery_health ];then
|
|
battery_status="\nBattery charge: $battery_charge%\nBattery health: $battery_health%\n"
|
|
fi
|
|
|
|
memtotal=$(cat /proc/meminfo | grep 'MemTotal' | tr -s ' ' | cut -f2 -d ' ')
|
|
memtotal=$((${memtotal} / 1024 / 1024 + 1))
|
|
cpustr=$(cat /proc/cpuinfo | grep 'model name' | uniq | sed -r 's/\(R\)//;s/\(TM\)//;s/CPU //;s/model name.*: //')
|
|
kernel=$(uname -s -r)
|
|
|
|
whiptail $BG_COLOR_MAIN_MENU --title 'System Info' \
|
|
--msgbox "${BOARD_NAME}\n\nFW_VER: ${FW_VER}\nKernel: ${kernel}\n\nCPU: ${cpustr}\nRAM: ${memtotal} GB\n$battery_status\n$(fdisk -l | grep -e '/dev/sd.:' -e '/dev/nvme.*:' | sed 's/B,.*/B/')" 16 60
|
|
}
|
|
|
|
select_os_boot_option()
|
|
{
|
|
mount_boot
|
|
if verify_global_hashes ; then
|
|
kexec-select-boot -m -b /boot -c "grub.cfg" -g
|
|
fi
|
|
}
|
|
|
|
attempt_default_boot()
|
|
{
|
|
mount_boot
|
|
|
|
if ! verify_global_hashes; then
|
|
return
|
|
fi
|
|
DEFAULT_FILE=`find /boot/kexec_default.*.txt 2>/dev/null | head -1`
|
|
if [ -r "$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." 16 90) then
|
|
kexec-select-boot -m -b /boot -c "grub.cfg" -g
|
|
fi
|
|
}
|
|
|
|
force_unsafe_boot()
|
|
{
|
|
# Run the menu selection in "force" mode, bypassing hash checks
|
|
if (whiptail $BG_COLOR_WARNING --title 'Unsafe Forced Boot Selected!' \
|
|
--yesno "WARNING: You have chosen to skip all tamper checks and boot anyway.\n\nThis is an unsafe option!\n\nDo you want to proceed?" 16 90) then
|
|
mount_boot && kexec-select-boot -m -b /boot -c "grub.cfg" -g -f
|
|
fi
|
|
}
|
|
|
|
# gui-init start
|
|
|
|
# Use stored HOTP key branding
|
|
if [ -r /boot/kexec_hotp_key ]; then
|
|
HOTPKEY_BRANDING="$(cat /boot/kexec_hotp_key)"
|
|
else
|
|
HOTPKEY_BRANDING="HOTP USB Security Dongle"
|
|
fi
|
|
|
|
if 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
|
|
[[ "$skip_to_menu" != "true" ]] && check_gpg_key && update_totp && update_hotp
|
|
|
|
if [[ "$HOTP" = "Success" && $CONFIG_AUTO_BOOT_TIMEOUT ]]; then
|
|
prompt_auto_default_boot
|
|
fi
|
|
|
|
while true; do
|
|
show_main_menu
|
|
done
|
|
|
|
recovery "Something failed during boot"
|