mirror of
https://github.com/linuxboot/heads.git
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336 lines
12 KiB
Bash
Executable File
336 lines
12 KiB
Bash
Executable File
#!/bin/sh
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# Boot from a local disk installation
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CONFIG_BOOT_GUI_MENU_NAME='Heads Boot Menu'
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. /etc/functions
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. /etc/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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if ! grep -q /boot /proc/mounts ; then
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mount -o ro /boot \
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|| recovery "Unable to mount /boot"
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fi
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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 $CONFIG_ERROR_BG_COLOR --clear --title 'ERROR: Missing Hash File!' \
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--yesno "The file containing hashes for /boot is missing!\n\nIf you are setting this system up for the first time, select Yes to update\nyour list of checksums.\n\nOtherwise this could indicate a compromise and you should select No to\nreturn to the main menu.\n\nWould you like to update your checksums now?" 30 90) then
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update_checksums
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fi
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return 1
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else
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CHANGED_FILES=$(grep -v 'OK$' /tmp/hash_output | cut -f1 -d ':')
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# if files changed before package manager started, show stern warning
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if [ -f "$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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TEXT="The following files failed the verification process:\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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if (whiptail $CONFIG_ERROR_BG_COLOR --clear --title 'ERROR: Boot Hash Mismatch' --yesno "$TEXT" 30 90) then
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update_checksums
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fi
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return 1
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fi
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}
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update_checksums()
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{
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if (whiptail --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 the files in /boot have not been tampered with.\n\nYou will need your GPG key to continue and this change will modify your disk.\n\nDo you want to continue?" 16 90) then
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mount_boot
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mount -o rw,remount /boot
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cd /boot
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find ./ -type f ! -name '*kexec*' | xargs sha256sum > /boot/kexec_hashes.txt
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DEFAULT_FILES=$(cat /boot/kexec_default_hashes.txt | cut -f3 -d ' ')
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echo $DEFAULT_FILES | xargs sha256sum > /boot/kexec_default_hashes.txt
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# Remove any package trigger log files
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# We don't need them after the user decides to sign
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rm -f /boot/kexec_package_trigger*
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# sign and auto-roll config counter
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extparam=
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if [ "$CONFIG_TPM" = "y" ]; then
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extparam=-u
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fi
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kexec-sign-config -p /boot $extparam \
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|| die "Failed to sign default config"
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# switch back to ro mode
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mount -o ro,remount /boot
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else
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echo "Returning to the main menu"
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fi
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}
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update_totp()
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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/libremkey_hotp_verification ]; then
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echo "Once you have scanned the QR code, hit Enter to configure your Librem Key"
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read
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/bin/seal-libremkey
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else
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echo "Once you have scanned the QR code, hit Enter to reboot"
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read
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fi
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/bin/reboot
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}
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last_half=X
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while true; do
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MAIN_MENU_OPTIONS=""
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MAIN_MENU_BG_COLOR=""
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unset totp_confirm
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# detect whether any GPG keys exist in the keyring, if not, initialize that first
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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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whiptail $CONFIG_ERROR_BG_COLOR --clear --title "ERROR: GPG keyring empty!" \
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--menu "ERROR: Heads couldn't find any GPG keys in your keyring.\n\nIf this is the first time the system has booted,\nyou should add a public GPG key to the BIOS now.\n\nIf you just reflashed a new BIOS, you'll need to add at least one\npublic key to the keyring.\n\nIf you have not just reflashed your BIOS, THIS COULD INDICATE TAMPERING!\n\nHow would you like to proceed?" 30 90 4 \
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'f' ' Add a GPG key to the running BIOS' \
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'i' ' Ignore error and continue to default boot menu' \
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'x' ' Exit to recovery shell' \
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2>/tmp/whiptail || recovery "GUI menu failed"
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totp_confirm=$(cat /tmp/whiptail)
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fi
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if [ "$totp_confirm" = "i" -o -z "$totp_confirm" ]; then
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# update the TOTP code every thirty seconds
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date=`date "+%Y-%m-%d %H:%M:%S"`
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seconds=`date "+%s"`
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half=`expr \( $seconds % 60 \) / 30`
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if [ "$CONFIG_TPM" = n ]; then
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TOTP="NO TPM"
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elif [ "$half" != "$last_half" ]; then
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last_half=$half;
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TOTP=`unseal-totp`
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if [ $? -ne 0 ]; then
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whiptail $CONFIG_ERROR_BG_COLOR --clear --title "ERROR: TOTP Generation Failed!" \
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--menu "ERROR: Heads couldn't generate the TOTP code.\n\nIf this is the first time the system has booted, you should reset the TPM\nand set your own password\n\nIf you just reflashed your BIOS, you'll need to generate a new TOTP secret.\n\nIf you have not just reflashed your BIOS, THIS COULD INDICATE TAMPERING!\n\nHow would you like to proceed?" 30 90 4 \
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'g' ' Generate new TOTP/HOTP secret' \
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'i' ' Ignore error and continue to default boot menu' \
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'p' ' Reset the TPM' \
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'x' ' Exit to recovery shell' \
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2>/tmp/whiptail || recovery "GUI menu failed"
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totp_confirm=$(cat /tmp/whiptail)
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fi
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fi
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fi
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if [ "$totp_confirm" = "i" -o -z "$totp_confirm" ]; then
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if [ -x /bin/libremkey_hotp_verification ]; then
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HOTP=`unseal-hotp`
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enable_usb
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if ! libremkey_hotp_verification info ; then
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whiptail $CONFIG_WARNING_BG_COLOR --clear --title 'WARNING: Please Insert Your Librem Key' --msgbox "Your Librem Key was not detected.\n\nPlease insert your Librem Key" 30 90
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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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libremkey_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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;;
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4 )
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HOTP="Invalid code"
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MAIN_MENU_BG_COLOR=$CONFIG_ERROR_BG_COLOR
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;;
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* )
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HOTP="Error checking code, Insert Librem Key and retry"
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MAIN_MENU_BG_COLOR=$CONFIG_WARNING_BG_COLOR
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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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whiptail $MAIN_MENU_BG_COLOR --clear --title "$CONFIG_BOOT_GUI_MENU_NAME" \
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--menu "$date\nTOTP: $TOTP | HOTP: $HOTP" 20 90 10 \
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'y' ' Default boot' \
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'a' ' Advanced Settings -->' \
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'x' ' Exit to recovery shell' \
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2>/tmp/whiptail || recovery "GUI menu failed"
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totp_confirm=$(cat /tmp/whiptail)
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fi
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if [ "$totp_confirm" = "a" ]; then
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whiptail --clear --title "Advanced Settings" \
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--menu "Configure Advanced Settings" 20 90 10 \
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'o' ' Other Boot Options -->' \
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'r' ' TOTP/HOTP does not match, refresh code' \
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'g' ' Generate new TOTP/HOTP secret' \
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's' ' Update checksums and sign all files in /boot' \
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'f' ' Flash/Update the BIOS -->' \
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'p' ' Reset the TPM' \
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'n' ' TOTP/HOTP does not match after refresh, troubleshoot' \
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'r' ' <-- Return to main menu' \
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2>/tmp/whiptail || recovery "GUI menu failed"
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totp_confirm=$(cat /tmp/whiptail)
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fi
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if [ "$totp_confirm" = "o" ]; then
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whiptail --clear --title "Other Boot Options" \
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--menu "Select A Boot Option" 20 90 10 \
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'm' ' Show OS boot menu' \
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'u' ' USB boot' \
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'i' ' Ignore tampering and force a boot (Unsafe!)' \
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'r' ' <-- Return to main menu' \
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2>/tmp/whiptail || recovery "GUI menu failed"
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totp_confirm=$(cat /tmp/whiptail)
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fi
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if [ "$totp_confirm" = "x" ]; then
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recovery "User requested recovery shell"
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fi
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if [ "$totp_confirm" = "r" ]; then
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continue
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fi
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if [ "$totp_confirm" = "n" ]; then
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if (whiptail $CONFIG_WARNING_BG_COLOR --title "TOTP/HOTP code mismatched" \
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--yesno "TOTP/HOTP code mismatches could indicate either TPM tampering or clock drift:\n\nTo correct clock drift: 'date -s HH:MM:SS'\nand save it to the RTC: 'hwclock -w'\nthen reboot and try again.\n\nWould you like to exit to a recovery console?" 30 90) then
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echo ""
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echo "To correct clock drift: 'date -s HH:MM:SS'"
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echo "and save it to the RTC: 'hwclock -w'"
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echo "then reboot and try again"
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echo ""
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recovery "TOTP/HOTP mismatch"
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else
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continue
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fi
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fi
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if [ "$totp_confirm" = "u" ]; then
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exec /bin/usb-init
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continue
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fi
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if [ "$totp_confirm" = "g" ]; then
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if (whiptail --title 'Generate new TOTP/HOTP secret' \
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--yesno "This will erase your old secret and replace it with a new one!\n\nDo you want to proceed?" 16 90) then
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update_totp
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else
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echo "Returning to the main menu"
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fi
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continue
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fi
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if [ "$totp_confirm" = "p" ]; then
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if (whiptail --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 $counter \
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|| die "Unable to increment tpm counter"
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sha256sum /tmp/counter-$counter > /boot/kexec_rollback.txt \
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|| die "Unable to create rollback file"
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mount -o ro,remount /boot
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update_totp
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else
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echo "Returning to the main menu"
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fi
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continue
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fi
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if [ "$totp_confirm" = "m" ]; then
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# Try to select a kernel from the menu
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mount_boot
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verify_global_hashes
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if [ $? -ne 0 ]; then
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continue
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fi
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kexec-select-boot -m -b /boot -c "grub.cfg" -g
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continue
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fi
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if [ "$totp_confirm" = "i" ]; then
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# Run the menu selection in "force" mode, bypassing hash checks
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if (whiptail $CONFIG_WARNING_BG_COLOR --title 'Unsafe Forced Boot Selected!' \
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--yesno "WARNING: You have chosen to skip all tamper checks and boot anyway.\n\nThis is an unsafe option!\n\nDo you want to proceed?" 16 90) then
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mount_boot
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kexec-select-boot -m -b /boot -c "grub.cfg" -g -f
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else
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echo "Returning to the main menu"
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fi
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continue
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fi
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if [ "$totp_confirm" = "s" ]; then
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update_checksums
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continue
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fi
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if [ "$totp_confirm" = "f" ]; then
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flash-gui.sh
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continue
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fi
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if [ "$totp_confirm" = "y" -o -n "$totp_confirm" ]; then
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# Try to boot the default
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mount_boot
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verify_global_hashes
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if [ $? -ne 0 ]; then
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continue
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fi
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DEFAULT_FILE=`find /boot/kexec_default.*.txt 2>/dev/null | head -1`
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if [ -r "$DEFAULT_FILE" ]; then
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kexec-select-boot -b /boot -c "grub.cfg" -g \
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|| recovery "Failed default boot"
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else
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if (whiptail --title 'No Default Boot Option Configured' \
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--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
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kexec-select-boot -m -b /boot -c "grub.cfg" -g
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else
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echo "Returning to the main menu"
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fi
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continue
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fi
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fi
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done
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recovery "Something failed during boot"
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