From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001

From: Robert Marshall <rmarshall@redhat.com>

Date: Thu, 25 Jun 2015 11:13:11 -0400

Subject: [PATCH] Add friendly grub2 password config tool (#985962)

Provided a tool for users to reset the grub2 root user password

without having to alter the grub.cfg. The hashed password now

lives in a root-only-readable configuration file.

Resolves: rhbz#985962

Signed-off-by: Robert Marshall <rmarshall@redhat.com>

[pjones: fix the efidir in grub-setpassword and rename tool]

Signed-off-by: Peter Jones <pjones@redhat.com>

[luto: fix grub-setpassword -o's output path]

Andy Lutomirski <luto@kernel.org>

---

 configure.ac              |   1 +

 Makefile.util.def         |  13 +++++

 util/grub-mkconfig.in     |   2 +

 util/grub-set-password.8  |  28 ++++++++++

 util/grub-set-password.in | 128 ++++++++++++++++++++++++++++++++++++++++++++++

 util/grub.d/01_users.in   |  11 ++++

 6 files changed, 183 insertions(+)

 create mode 100644 util/grub-set-password.8

 create mode 100644 util/grub-set-password.in

 create mode 100644 util/grub.d/01_users.in

diff --git a/configure.ac b/configure.ac

index fdcb452581c..30fd84d8067 100644

--- a/configure.ac

+++ b/configure.ac

@@ -72,6 +72,7 @@ grub_TRANSFORM([grub-mkrelpath])

 grub_TRANSFORM([grub-mkrescue])

 grub_TRANSFORM([grub-probe])

 grub_TRANSFORM([grub-reboot])

+grub_TRANSFORM([grub-set-password])

 grub_TRANSFORM([grub-rpm-sort])

 grub_TRANSFORM([grub-script-check])

 grub_TRANSFORM([grub-set-default])

diff --git a/Makefile.util.def b/Makefile.util.def

index ba4cf4b29b0..1a7dd433e33 100644

--- a/Makefile.util.def

+++ b/Makefile.util.def

@@ -452,6 +452,12 @@ script = {

   installdir = grubconf;

 };

+script = {

+  name = '01_users';

+  common = util/grub.d/01_users.in;

+  installdir = grubconf;

+};

+

 script = {

   name = '10_windows';

   common = util/grub.d/10_windows.in;

@@ -740,6 +746,13 @@ script = {

   installdir = sbin;

 };

+script = {

+  name = grub-set-password;

+  common = util/grub-set-password.in;

+  mansection = 8;

+  installdir = sbin;

+};

+

 script = {

   name = grub-mkconfig_lib;

   common = util/grub-mkconfig_lib.in;

diff --git a/util/grub-mkconfig.in b/util/grub-mkconfig.in

index 8ea2315ebc2..ba14cf6261c 100644

--- a/util/grub-mkconfig.in

+++ b/util/grub-mkconfig.in

@@ -276,6 +276,8 @@ for i in "${grub_mkconfig_dir}"/* ; do

     *~) ;;

     # emacsen autosave files. FIXME: support other editors

     */\#*\#) ;;

+    # rpm config files of yore.

+    *.rpmsave|*.rpmnew|*.rpmorig) ;;

     *)

       if grub_file_is_not_garbage "$i" && test -x "$i" ; then

         echo

diff --git a/util/grub-set-password.8 b/util/grub-set-password.8

new file mode 100644

index 00000000000..9646546e43d

--- /dev/null

+++ b/util/grub-set-password.8

@@ -0,0 +1,28 @@

+.TH GRUB-SET-PASSWORD 3 "Thu Jun 25 2015"

+.SH NAME

+\fBgrub-set-password\fR \(em Generate the user.cfg file containing the hashed grub bootloader password.

+

+.SH SYNOPSIS

+\fBgrub-set-password\fR [OPTION]

+

+.SH DESCRIPTION

+\fBgrub-set-password\fR outputs the user.cfg file which contains the hashed GRUB bootloader password. This utility only supports configurations where there is a single root user.

+

+The file has the format:

+GRUB2_PASSWORD=<\fIhashed password\fR>.

+

+.SH OPTIONS

+.TP

+-h, --help

+Display program usage and exit.

+.TP

+-v, --version

+Display the current version.

+.TP

+-o, --output=<\fIDIRECTORY\fR>

+Choose the file path to which user.cfg will be written.

+

+.SH SEE ALSO

+.BR "info grub"

+

+.BR "info grub2-mkpasswd-pbkdf2"

diff --git a/util/grub-set-password.in b/util/grub-set-password.in

new file mode 100644

index 00000000000..5ebf50576d6

--- /dev/null

+++ b/util/grub-set-password.in

@@ -0,0 +1,128 @@

+#!/bin/sh -e

+

+EFIDIR=$(grep ^ID= /etc/os-release | sed -e 's/^ID=//' -e 's/rhel/redhat/')

+if [ -d /sys/firmware/efi/efivars/ ]; then

+    grubdir=`echo "/@bootdirname@/efi/EFI/${EFIDIR}/" | sed 's,//*,/,g'`

+else

+    grubdir=`echo "/@bootdirname@/@grubdirname@" | sed 's,//*,/,g'`

+fi

+

+PACKAGE_VERSION="@PACKAGE_VERSION@"

+PACKAGE_NAME="@PACKAGE_NAME@"

+self=`basename $0`

+bindir="@bindir@"

+grub_mkpasswd="${bindir}/@grub_mkpasswd_pbkdf2@"

+

+# Usage: usage

+# Print the usage.

+usage () {

+    cat <

+Usage: $0 [OPTION]

+$0 prompts the user to set a password on the grub bootloader. The password

+is written to a file named user.cfg which lives in the GRUB directory

+located by default at ${grubdir}.

+

+  -h, --help                     print this message and exit

+  -v, --version                  print the version information and exit

+  -o, --output_path <DIRECTORY>  put user.cfg in a user-selected directory

+

+Report bugs at https://bugzilla.redhat.com.

+EOF

+}

+

+argument () {

+    opt=$1

+    shift

+

+    if test $# -eq 0; then

+        gettext_printf "%s: option requires an argument -- \`%s'\n" "$self" "$opt" 1>&2

+        exit 1

+    fi

+    echo $1

+}

+

+# Ensure that it's the root user running this script

+if [ "${EUID}" -ne 0 ]; then

+    echo "The grub bootloader password may only be set by root."

+    usage

+    exit 2

+fi

+

+# Check the arguments.

+while test $# -gt 0

+do

+    option=$1

+    shift

+

+    case "$option" in

+    -h | --help)

+	usage

+	exit 0 ;;

+    -v | --version)

+	echo "$self (${PACKAGE_NAME}) ${PACKAGE_VERSION}"

+	exit 0 ;;

+    -o | --output)

+        OUTPUT_PATH=`argument $option "$@"`; shift ;;

+    --output=*)

+        OUTPUT_PATH=`echo "$option" | sed 's/--output=//'` ;;

+    -o=*)

+        OUTPUT_PATH=`echo "$option" | sed 's/-o=//'` ;;

+    esac

+done

+

+# set user input or default path for user.cfg file

+if [ -z "${OUTPUT_PATH}" ]; then

+    OUTPUT_PATH="${grubdir}"

+fi

+

+if [ ! -d "${OUTPUT_PATH}" ]; then

+    echo "${OUTPUT_PATH} does not exist."

+    usage

+    exit 2;

+fi

+

+ttyopt=$(stty -g)

+fixtty() {

+      stty ${ttyopt}

+}

+

+trap fixtty EXIT

+stty -echo

+

+# prompt & confirm new grub2 root user password

+echo -n "Enter password: "

+read PASSWORD

+echo

+echo -n "Confirm password: "

+read PASSWORD_CONFIRM

+echo

+stty ${ttyopt}

+

+getpass() {

+    local P0

+    local P1

+    P0="$1" && shift

+    P1="$1" && shift

+

+    ( echo ${P0} ; echo ${P1} ) | \

+        LC_ALL=C ${grub_mkpasswd} | \

+        grep -v '[eE]nter password:' | \

+        sed -e "s/PBKDF2 hash of your password is //"

+}

+

+MYPASS="$(getpass "${PASSWORD}" "${PASSWORD_CONFIRM}")"

+if [ -z "${MYPASS}" ]; then

+      echo "${self}: error: empty password" 1>&2

+      exit 1

+fi

+

+# on the ESP, these will fail to set the permissions, but it's okay because

+# the directory is protected.

+install -m 0600 /dev/null "${OUTPUT_PATH}/user.cfg" 2>/dev/null || :

+chmod 0600 "${OUTPUT_PATH}/user.cfg" 2>/dev/null || :

+echo "GRUB2_PASSWORD=${MYPASS}" > "${OUTPUT_PATH}/user.cfg"

+

+if ! grep -q "^### BEGIN /etc/grub.d/01_users ###$" "${OUTPUT_PATH}/grub.cfg"; then

+    echo "WARNING: The current configuration lacks password support!"

+    echo "Update your configuration with @grub_mkconfig@ to support this feature."

+fi

diff --git a/util/grub.d/01_users.in b/util/grub.d/01_users.in

new file mode 100644

index 00000000000..db2f44bfb78

--- /dev/null

+++ b/util/grub.d/01_users.in

@@ -0,0 +1,11 @@

+#!/bin/sh -e

+cat << EOF

+if [ -f \${prefix}/user.cfg ]; then

+  source \${prefix}/user.cfg

+  if [ -n "\${GRUB2_PASSWORD}" ]; then

+    set superusers="root"

+    export superusers

+    password_pbkdf2 root \${GRUB2_PASSWORD}

+  fi

+fi

+EOF