UnknownSec Bypass 403

: /proc/1604/root/usr/sbin/ [ drwxr-xr-x ]
name : update-secureboot-policy #!/bin/sh set -e if test $# = 0 \ && test x"$SHIM_NOTRIGGER" = x \ && test x"$DPKG_MAINTSCRIPT_PACKAGE" != x \ && dpkg-trigger --check-supported 2>/dev/null then if dpkg-trigger --no-await shim-secureboot-policy; then if test x"$SHIM_TRIGGER_DEBUG" != x; then echo "shim: wrapper deferring policy update (trigger activated)" fi exit 0 fi fi if [ "$(id -u)" -ne 0 ]; then echo "$0: Permission denied" exit 1 fi do_enroll=0 do_toggle=0 efivars=/sys/firmware/efi/efivars secureboot_var=SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c moksbstatert_var=MokSBStateRT-605dab50-e046-4300-abb6-3dd810dd8b23 SB_KEY="/var/lib/shim-signed/mok/MOK.der" SB_PRIV="/var/lib/shim-signed/mok/MOK.priv" OLD_DKMS_LIST="/var/lib/shim-signed/dkms-list" NEW_DKMS_LIST="${OLD_DKMS_LIST}.new" touch $OLD_DKMS_LIST dkms_list=$(find /var/lib/dkms -maxdepth 1 -type d -print 2>/dev/null \ | LC_ALL=C sort) dkms_modules=$(echo "$dkms_list" | wc -l) . /usr/share/debconf/confmodule update_dkms_list() { echo "$dkms_list" > $NEW_DKMS_LIST } save_dkms_list() { mv "$NEW_DKMS_LIST" "$OLD_DKMS_LIST" } clear_new_dkms_list() { rm "$NEW_DKMS_LIST" } new_dkms_module() { # handle nvidia module specially because it changed path if ! grep -q "/var/lib/dkms/nvidia" "$OLD_DKMS_LIST" && grep -q "/var/lib/dkms/nvidia" "$NEW_DKMS_LIST" ; then # nvidia module is newly added return 0 fi # return 0 if there is any other new module env LC_ALL=C comm -1 -3 $OLD_DKMS_LIST $NEW_DKMS_LIST | grep -q -v "/var/lib/dkms/nvidia" } show_dkms_list_changes() { diff -u $OLD_DKMS_LIST $NEW_DKMS_LIST >&2 } validate_password() { db_capb if [ "$key" != "$again" ]; then db_fset shim/error/secureboot_key_mismatch seen false db_input critical shim/error/secureboot_key_mismatch || true STATE=$(($STATE - 2)) else length=$((`echo "$key" | wc -c` - 1)) if [ $length -lt 8 ] || [ $length -gt 16 ]; then db_fset shim/error/bad_secureboot_key seen false db_input critical shim/error/bad_secureboot_key || true STATE=$(($STATE - 2)) elif [ $length -ne 0 ]; then return 0 fi fi return 1 } clear_passwords() { # Always clear secureboot key. db_set shim/secureboot_key '' db_fset shim/secureboot_key seen false db_set shim/secureboot_key_again '' db_fset shim/secureboot_key_again seen false } toggle_validation() { local key="$1" local again="$2" echo "Enabling shim validation." printf '%s\n%s\n' "$key" "$again" | mokutil --enable-validation >/dev/null || true mokutil --timeout -1 >/dev/null || true } enroll_mok() { local key="$1" local again="$2" echo "Adding '$SB_KEY' to shim:" printf '%s\n%s\n' "$key" "$again" | mokutil --import "$SB_KEY" >/dev/null || true mokutil --timeout -1 >/dev/null || true } do_it() { STATE=1 db_settitle shim/title/secureboot while true; do case "$STATE" in 1) db_capb db_fset shim/secureboot_explanation seen false db_input critical shim/secureboot_explanation || true ;; 2) if [ "$do_toggle" -eq 1 ]; then # Force no backtracking here; otherwise the GNOME backend # might allow it due to displaying the explanation just before. # Fixes LP: #1767091 db_capb # Allow the user to skip toggling Secure Boot. db_fset shim/enable_secureboot seen false db_input critical shim/enable_secureboot || true db_go db_get shim/enable_secureboot if [ "$RET" = "false" ]; then break fi fi ;; 3) db_input critical shim/secureboot_key || true seen_key=$RET db_input critical shim/secureboot_key_again || true ;; 4) db_get shim/secureboot_key key="$RET" db_get shim/secureboot_key_again again="$RET" if [ -z "$key$again" ] && echo "$seen_key" | grep -q ^30; then echo "Running in non-interactive mode, doing nothing." >&2 if new_dkms_module; then show_dkms_list_changes clear_new_dkms_list exit 1 else exit 0 fi fi if validate_password; then if [ $do_toggle -eq 1 ]; then toggle_validation "$key" "$again" fi if [ $do_enroll -eq 1 ]; then enroll_mok "$key" "$again" fi save_dkms_list fi clear_passwords ;; *) break ;; esac if db_go; then STATE=$(($STATE + 1)) else STATE=$(($STATE - 1)) fi db_capb backup done db_capb } validate_actions() { # Validate any queued actions before we go try to do them. local moksbstatert=0 if ! [ -d $efivars ]; then echo "$efivars not found, aborting." >&2 exit 0 fi if ! [ -f $efivars/$secureboot_var ] \ || [ "$(od -An -t u1 $efivars/$secureboot_var | awk '{ print $NF }')" -ne 1 ] then echo "Secure Boot not enabled on this system." >&2 exit 0 fi if [ $dkms_modules -lt 2 ]; then echo "No DKMS modules installed." >&2 exit 0 fi if [ -f /proc/sys/kernel/moksbstate_disabled ]; then moksbstatert=$(cat /proc/sys/kernel/moksbstate_disabled 2>/dev/null || echo 0) elif [ -f $efivars/$moksbstatert_var ]; then # MokSBStateRT set to 1 means validation is disabled moksbstatert=$(od -An -t u1 $efivars/$moksbstatert_var | \ awk '{ print $NF; }') fi # We were asked to enroll a key. This only makes sense if validation # is enabled. if [ $do_enroll -eq 1 ] && [ $moksbstatert -eq 1 ]; then do_toggle=1 fi } create_mok() { if [ -e "$SB_KEY" ]; then return fi echo "Generating a new Secure Boot signing key:" openssl req -config /usr/lib/shim/mok/openssl.cnf \ -subj "/CN=`hostname -s | cut -b1-31` Secure Boot Module Signature key" \ -new -x509 -newkey rsa:2048 \ -nodes -days 36500 -outform DER \ -keyout "$SB_PRIV" \ -out "$SB_KEY" } update_dkms_list case "$1" in '--enable'|'--disable') echo "Please run mokutil directly to change shim validation behavior." exit 0 ;; '--new-key') create_mok exit 0 ;; '--enroll-key') if [ -e "$SB_KEY" ]; then if mokutil --test-key "$SB_KEY" | \ grep -qc 'is not'; then do_enroll=1 fi else echo "No MOK found." exit 1 fi ;; *) echo "update-secureboot-policy: toggle UEFI Secure Boot in shim" echo echo "\t--new-key\tCreate a new MOK." echo "\t--enroll-key\tEnroll the new MOK for this system in shim." echo "\t--help\t\tThis help text." exit 0 esac validate_actions if [ $(($do_toggle + $do_enroll)) -lt 1 ]; then echo "Nothing to do." exit 0 fi do_it exit 0