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lxc-busybox: make shellcheck clean
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner
parent
832cb1824a
commit
b62671d849
@ -1,349 +1,221 @@
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#!/bin/bash
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#!/bin/sh
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# Client script for LXC container images.
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#
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# lxc: linux Container library
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# Copyright @ Daniel Lezcano <daniel.lezcano@free.fr>
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# Copyright © 2018 Christian Brauner <christian.brauner@ubuntu.com>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# Authors:
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# Daniel Lezcano <daniel.lezcano@free.fr>
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
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# USA
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LXC_MAPPED_UID=
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LXC_MAPPED_GID=
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SSH=
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# Make sure the usual locations are in PATH
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export PATH=$PATH:/usr/sbin:/usr/bin:/sbin:/bin
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am_in_userns() {
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[ -e /proc/self/uid_map ] || { echo no; return; }
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[ "$(wc -l /proc/self/uid_map | awk '{ print $1 }')" -eq 1 ] || { echo yes; return; }
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line=$(awk '{ print $1 " " $2 " " $3 }' /proc/self/uid_map)
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[ "$line" = "0 0 4294967295" ] && { echo no; return; }
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echo yes
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in_userns() {
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[ -e /proc/self/uid_map ] || { echo no; return; }
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while read -r line; do
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fields="$(echo "$line" | awk '{ print $1 " " $2 " " $3 }')"
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if [ "${fields}" = "0 0 4294967295" ]; then
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echo no;
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return;
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fi
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if echo "${fields}" | grep -q " 0 1$"; then
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echo userns-root;
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return;
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fi
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done < /proc/self/uid_map
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[ "$(cat /proc/self/uid_map)" = "$(cat /proc/1/uid_map)" ] && { echo userns-root; return; }
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echo yes
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}
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in_userns=0
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[ $(am_in_userns) = "yes" ] && in_userns=1
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copy_binary()
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{
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binary_path=`which $1`
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if [ $? -ne 0 ]; then
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echo "Unable to find $1 binary on the system"
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return 1
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fi
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dir_path="${binary_path%/*}"
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echo /{,usr/}{,s}bin | grep $dir_path >/dev/null 2>&1
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if [ $? -ne 0 ]; then
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echo "Binary $1 is located at $binary_path and will not be copied"
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echo "($dir_path not supported)"
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return 1
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fi
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cp $binary_path $rootfs/$binary_path
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if [ $? -ne 0 ]; then
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echo "Failed to copy $binary_path to rootfs"
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return 1
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fi
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return 0
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}
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USERNS="$(in_userns)"
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install_busybox()
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{
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rootfs=$1
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name=$2
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res=0
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tree="\
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$rootfs/selinux \
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$rootfs/dev \
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$rootfs/home \
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$rootfs/root \
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$rootfs/etc \
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$rootfs/etc/init.d \
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$rootfs/bin \
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$rootfs/usr/bin \
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$rootfs/sbin \
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$rootfs/usr/sbin \
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$rootfs/proc \
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$rootfs/sys \
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$rootfs/mnt \
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$rootfs/tmp \
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$rootfs/var/log \
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$rootfs/usr/share/udhcpc \
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$rootfs/dev/pts \
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$rootfs/dev/shm \
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$rootfs/lib \
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$rootfs/usr/lib \
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$rootfs/lib64 \
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$rootfs/usr/lib64"
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rootfs="${1}"
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name="${2}"
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res=0
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fstree="\
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${rootfs}/selinux \
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${rootfs}/dev \
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${rootfs}/home \
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${rootfs}/root \
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${rootfs}/etc \
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${rootfs}/etc/init.d \
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${rootfs}/bin \
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${rootfs}/usr/bin \
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${rootfs}/sbin \
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${rootfs}/usr/sbin \
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${rootfs}/proc \
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${rootfs}/sys \
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${rootfs}/mnt \
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${rootfs}/tmp \
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${rootfs}/var/log \
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${rootfs}/usr/share/udhcpc \
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${rootfs}/dev/pts \
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${rootfs}/dev/shm \
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${rootfs}/lib \
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${rootfs}/usr/lib \
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${rootfs}/lib64 \
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${rootfs}/usr/lib64"
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mkdir -p $tree || return 1
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chmod 755 $tree || return 1
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# shellcheck disable=SC2086
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mkdir -p ${fstree} || return 1
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# shellcheck disable=SC2086
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chmod 755 ${fstree} || return 1
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pushd $rootfs/dev > /dev/null || return 1
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# minimal devices needed for busybox
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if [ "${USERNS}" = "yes" ]; then
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for dev in tty console tty0 tty1 ram0 null urandom; do
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echo "lxc.mount.entry = /dev/${dev} dev/${dev} none bind,optional,create=file 0 0" >> "${path}/config"
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done
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else
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mknod -m 666 "${rootfs}/tty" c 5 0 || res=1
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mknod -m 666 "${rootfs}/console" c 5 1 || res=1
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mknod -m 666 "${rootfs}/tty0" c 4 0 || res=1
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mknod -m 666 "${rootfs}/tty1" c 4 0 || res=1
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mknod -m 666 "${rootfs}/tty5" c 4 0 || res=1
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mknod -m 600 "${rootfs}/ram0" b 1 0 || res=1
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mknod -m 666 "${rootfs}/null" c 1 3 || res=1
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mknod -m 666 "${rootfs}/zero" c 1 5 || res=1
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mknod -m 666 "${rootfs}/urandom" c 1 9 || res=1
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fi
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# minimal devices needed for busybox
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if [ $in_userns -eq 1 ]; then
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for dev in tty console tty0 tty1 ram0 null urandom; do
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echo "lxc.mount.entry = /dev/$dev dev/$dev none bind,optional,create=file 0 0" >> $path/config
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done
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else
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mknod -m 666 tty c 5 0 || res=1
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mknod -m 666 console c 5 1 || res=1
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mknod -m 666 tty0 c 4 0 || res=1
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mknod -m 666 tty1 c 4 0 || res=1
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mknod -m 666 tty5 c 4 0 || res=1
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mknod -m 600 ram0 b 1 0 || res=1
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mknod -m 666 null c 1 3 || res=1
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mknod -m 666 zero c 1 5 || res=1
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mknod -m 666 urandom c 1 9 || res=1
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fi
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popd > /dev/null
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# root user defined
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cat <<EOF >> $rootfs/etc/passwd
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# root user defined
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cat <<EOF >> "${rootfs}/etc/passwd"
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root:x:0:0:root:/root:/bin/sh
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EOF
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cat <<EOF >> $rootfs/etc/group
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cat <<EOF >> "${rootfs}/etc/group"
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root:x:0:root
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EOF
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# mount everything
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cat <<EOF >> $rootfs/etc/init.d/rcS
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cat <<EOF >> "${rootfs}/etc/init.d/rcS"
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#!/bin/sh
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/bin/syslogd
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/bin/mount -a
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/bin/udhcpc
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EOF
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# executable
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chmod 744 $rootfs/etc/init.d/rcS || return 1
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# executable
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chmod 744 "${rootfs}/etc/init.d/rcS" || return 1
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# launch rcS first then make a console available
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# and propose a shell on the tty, the last one is
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# not needed
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cat <<EOF >> $rootfs/etc/inittab
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# launch rcS first then make a console available
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# and propose a shell on the tty, the last one is
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# not needed
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cat <<EOF >> "${rootfs}/etc/inittab"
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::sysinit:/etc/init.d/rcS
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tty1::respawn:/bin/getty -L tty1 115200 vt100
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console::askfirst:/bin/sh
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EOF
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# writable and readable for other
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chmod 644 $rootfs/etc/inittab || return 1
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# writable and readable for other
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chmod 644 "${rootfs}/etc/inittab" || return 1
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cat <<EOF >> $rootfs/usr/share/udhcpc/default.script
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cat <<EOF >> "${rootfs}/usr/share/udhcpc/default.script"
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#!/bin/sh
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case "\$1" in
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deconfig)
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ip addr flush dev \$interface
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;;
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deconfig)
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ip addr flush dev \$interface
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;;
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renew|bound)
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# flush all the routes
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if [ -n "\$router" ]; then
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ip route del default 2> /dev/null
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fi
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renew|bound)
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# flush all the routes
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if [ -n "\$router" ]; then
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ip route del default 2> /dev/null
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fi
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# check broadcast
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if [ -n "\$broadcast" ]; then
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broadcast="broadcast \$broadcast"
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fi
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# check broadcast
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if [ -n "\$broadcast" ]; then
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broadcast="broadcast \$broadcast"
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fi
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# add a new ip address
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ip addr add \$ip/\$mask \$broadcast dev \$interface
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# add a new ip address
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ip addr add \$ip/\$mask \$broadcast dev \$interface
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if [ -n "\$router" ]; then
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ip route add default via \$router dev \$interface
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fi
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if [ -n "\$router" ]; then
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ip route add default via \$router dev \$interface
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fi
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[ -n "\$domain" ] && echo search \$domain > /etc/resolv.conf
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for i in \$dns ; do
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echo nameserver \$i >> /etc/resolv.conf
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done
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;;
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[ -n "\$domain" ] && echo search \$domain > /etc/resolv.conf
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for i in \$dns ; do
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echo nameserver \$i >> /etc/resolv.conf
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done
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;;
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esac
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exit 0
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EOF
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chmod 744 $rootfs/usr/share/udhcpc/default.script
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chmod 744 "${rootfs}/usr/share/udhcpc/default.script"
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return $res
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}
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install_dropbear()
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{
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# copy dropbear binary
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copy_binary dropbear || return 1
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# make symlinks to various ssh utilities
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utils="\
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$rootfs/usr/bin/dbclient \
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$rootfs/usr/bin/scp \
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$rootfs/usr/bin/ssh \
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$rootfs/usr/sbin/dropbearkey \
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$rootfs/usr/sbin/dropbearconvert \
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"
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echo $utils | xargs -n1 ln -s /usr/sbin/dropbear
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# add necessary config files
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mkdir $rootfs/etc/dropbear
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dropbearkey -t rsa -f $rootfs/etc/dropbear/dropbear_rsa_host_key > /dev/null 2>&1
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dropbearkey -t dss -f $rootfs/etc/dropbear/dropbear_dss_host_key > /dev/null 2>&1
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echo "'dropbear' ssh utility installed"
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return 0
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}
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install_openssh()
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{
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# tools to be installed
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server_utils="sshd"
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client_utils="\
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ssh \
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scp \
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"
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client_optional_utils="\
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sftp \
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ssh-add \
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ssh-agent \
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ssh-keygen \
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ssh-keyscan \
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ssh-argv0 \
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ssh-copy-id \
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"
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# new folders used by ssh
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ssh_tree="\
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$rootfs/etc/ssh \
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$rootfs/var/empty/sshd \
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$rootfs/var/lib/empty/sshd \
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$rootfs/var/run/sshd \
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"
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# create folder structure
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mkdir -p $ssh_tree
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if [ $? -ne 0 ]; then
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return 1
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fi
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# copy binaries
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for bin in $server_utils $client_utils; do
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copy_binary $bin || return 1
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done
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for bin in $client_optional_utils; do
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tool_path=`which $bin` && copy_binary $bin
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done
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# add user and group
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cat <<EOF >> $rootfs/etc/passwd
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sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
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EOF
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cat <<EOF >> $rootfs/etc/group
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sshd:x:74:
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EOF
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# generate container keys
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ssh-keygen -t rsa -N "" -f $rootfs/etc/ssh/ssh_host_rsa_key >/dev/null 2>&1
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ssh-keygen -t dsa -N "" -f $rootfs/etc/ssh/ssh_host_dsa_key >/dev/null 2>&1
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# by default setup root password with no password
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cat <<EOF > $rootfs/etc/ssh/sshd_config
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Port 22
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Protocol 2
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HostKey /etc/ssh/ssh_host_rsa_key
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HostKey /etc/ssh/ssh_host_dsa_key
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UsePrivilegeSeparation yes
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KeyRegenerationInterval 3600
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ServerKeyBits 768
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SyslogFacility AUTH
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LogLevel INFO
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LoginGraceTime 120
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PermitRootLogin yes
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StrictModes yes
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RSAAuthentication yes
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PubkeyAuthentication yes
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IgnoreRhosts yes
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RhostsRSAAuthentication no
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HostbasedAuthentication no
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PermitEmptyPasswords yes
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ChallengeResponseAuthentication no
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EOF
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echo "'OpenSSH' utility installed"
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return 0
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return "${res}"
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}
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configure_busybox()
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{
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rootfs=$1
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rootfs="${1}"
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which busybox >/dev/null 2>&1
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if ! which busybox > /dev/null 2>&1; then
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echo "ERROR: Failed to find busybox binary"
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return 1
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fi
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if [ $? -ne 0 ]; then
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echo "busybox executable is not accessible"
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return 1
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fi
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# copy busybox in the rootfs
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if ! cp "$(which busybox)" "${rootfs}/bin"; then
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echo "ERROR: Failed to copy busybox binary"
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return 1
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fi
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# copy busybox in the rootfs
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cp $(which busybox) $rootfs/bin
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if [ $? -ne 0 ]; then
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echo "failed to copy busybox in the rootfs"
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return 1
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fi
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# symlink busybox for the commands it supports
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# it would be nice to just use "chroot $rootfs busybox --install -s /bin"
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# but that only works right in a chroot with busybox >= 1.19.0
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pushd $rootfs/bin > /dev/null || return 1
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# symlink busybox for the commands it supports
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# it would be nice to just use "chroot $rootfs busybox --install -s /bin"
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# but that only works right in a chroot with busybox >= 1.19.0
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(
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cd "${rootfs}/bin" || return 1
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./busybox --help | grep 'Currently defined functions:' -A300 | \
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grep -v 'Currently defined functions:' | tr , '\n' | \
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xargs -n1 ln -s busybox
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popd > /dev/null
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)
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# relink /sbin/init
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ln $rootfs/bin/busybox $rootfs/sbin/init
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# relink /sbin/init
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ln "${rootfs}/bin/busybox" "${rootfs}/sbin/init"
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# /etc/fstab must exist for "mount -a"
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touch $rootfs/etc/fstab
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# /etc/fstab must exist for "mount -a"
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touch "${rootfs}/etc/fstab"
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# passwd exec must be setuid
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chmod +s $rootfs/bin/passwd
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touch $rootfs/etc/shadow
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# passwd exec must be setuid
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chmod +s "${rootfs}/bin/passwd"
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touch "${rootfs}/etc/shadow"
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return 0
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return 0
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}
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copy_configuration()
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{
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path=$1
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rootfs=$2
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name=$3
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path="${1}"
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rootfs="${2}"
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name="${3}"
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|
||||
grep -q "^lxc.rootfs.path" $path/config 2>/dev/null || echo "lxc.rootfs.path = $rootfs" >> $path/config
|
||||
cat <<EOF >> $path/config
|
||||
grep -q "^lxc.rootfs.path" "${path}/config" 2>/dev/null || echo "lxc.rootfs.path = ${rootfs}" >> "${path}/config"
|
||||
cat <<EOF >> "${path}/config"
|
||||
lxc.signal.halt = SIGUSR1
|
||||
lxc.signal.reboot = SIGTERM
|
||||
lxc.uts.name = $name
|
||||
lxc.uts.name = "${name}"
|
||||
lxc.tty.max = 1
|
||||
lxc.pty.max = 1
|
||||
lxc.cap.drop = sys_module mac_admin mac_override sys_time
|
||||
@ -355,130 +227,104 @@ lxc.mount.auto = cgroup:mixed proc:mixed sys:mixed
|
||||
lxc.mount.entry = shm /dev/shm tmpfs defaults 0 0
|
||||
EOF
|
||||
|
||||
libdirs="\
|
||||
lib \
|
||||
usr/lib \
|
||||
lib64 \
|
||||
usr/lib64"
|
||||
|
||||
for dir in $libdirs; do
|
||||
if [ -d "/$dir" ] && [ -d "$rootfs/$dir" ]; then
|
||||
echo "lxc.mount.entry = /$dir $dir none ro,bind 0 0" >> $path/config
|
||||
fi
|
||||
done
|
||||
echo "lxc.mount.entry = /sys/kernel/security sys/kernel/security none ro,bind,optional 0 0" >>$path/config
|
||||
libdirs="\
|
||||
lib \
|
||||
usr/lib \
|
||||
lib64 \
|
||||
usr/lib64"
|
||||
|
||||
for dir in ${libdirs}; do
|
||||
if [ -d "/${dir}" ] && [ -d "${rootfs}/${dir}" ]; then
|
||||
echo "lxc.mount.entry = /${dir} ${dir} none ro,bind 0 0" >> "${path}/config"
|
||||
fi
|
||||
done
|
||||
echo "lxc.mount.entry = /sys/kernel/security sys/kernel/security none ro,bind,optional 0 0" >> "${path}/config"
|
||||
}
|
||||
|
||||
remap_userns()
|
||||
{
|
||||
path=$1
|
||||
path="${1}"
|
||||
|
||||
if [ -n "$LXC_MAPPED_UID" ] && [ "$LXC_MAPPED_UID" != "-1" ]; then
|
||||
chown $LXC_MAPPED_UID $path/config >/dev/null 2>&1
|
||||
chown -R root $path/rootfs >/dev/null 2>&1
|
||||
fi
|
||||
if [ -n "$LXC_MAPPED_UID" ] && [ "$LXC_MAPPED_UID" != "-1" ]; then
|
||||
chown "${LXC_MAPPED_UID}" "${path}/config" > /dev/null 2>&1
|
||||
chown -R root "${path}/rootfs" > /dev/null 2>&1
|
||||
fi
|
||||
|
||||
if [ -n "$LXC_MAPPED_GID" ] && [ "$LXC_MAPPED_GID" != "-1" ]; then
|
||||
chgrp $LXC_MAPPED_GID $path/config >/dev/null 2>&1
|
||||
chgrp -R root $path/rootfs >/dev/null 2>&1
|
||||
fi
|
||||
if [ -n "$LXC_MAPPED_GID" ] && [ "$LXC_MAPPED_GID" != "-1" ]; then
|
||||
chgrp "${LXC_MAPPED_GID}" "${path}/config" > /dev/null 2>&1
|
||||
chgrp -R root "${path}/rootfs" > /dev/null 2>&1
|
||||
fi
|
||||
}
|
||||
|
||||
usage()
|
||||
{
|
||||
cat <<EOF
|
||||
$1 -h|--help -p|--path=<path> -s|--ssh={dropbear,openssh}
|
||||
usage() {
|
||||
cat <<EOF
|
||||
LXC busybox image builder
|
||||
|
||||
Special arguments:
|
||||
[ -h | --help ]: Print this help message and exit.
|
||||
|
||||
LXC internal arguments (do not pass manually!):
|
||||
[ --name <name> ]: The container name
|
||||
[ --path <path> ]: The path to the container
|
||||
[ --rootfs <rootfs> ]: The path to the container's rootfs
|
||||
[ --mapped-uid <map> ]: A uid map (user namespaces)
|
||||
[ --mapped-gid <map> ]: A gid map (user namespaces)
|
||||
EOF
|
||||
return 0
|
||||
return 0
|
||||
}
|
||||
|
||||
options=$(getopt -o hp:n:s: -l help,rootfs:,path:,name:,mapped-uid:,mapped-gid:,ssh: -- "$@")
|
||||
if [ $? -ne 0 ]; then
|
||||
usage $(basename $0)
|
||||
exit 1
|
||||
if ! options=$(getopt -o hp:n: -l help,rootfs:,path:,name:,mapped-uid:,mapped-gid: -- "$@"); then
|
||||
usage
|
||||
exit 1
|
||||
fi
|
||||
eval set -- "$options"
|
||||
|
||||
while true
|
||||
do
|
||||
case "$1" in
|
||||
-h|--help) usage $0 && exit 0;;
|
||||
-p|--path) path=$2; shift 2;;
|
||||
--rootfs) rootfs=$2; shift 2;;
|
||||
-n|--name) name=$2; shift 2;;
|
||||
--mapped-uid) LXC_MAPPED_UID=$2; shift 2;;
|
||||
--mapped-gid) LXC_MAPPED_GID=$2; shift 2;;
|
||||
-s|--ssh) SSH=$2; shift 2;;
|
||||
--) shift 1; break ;;
|
||||
*) break ;;
|
||||
esac
|
||||
case "$1" in
|
||||
-h|--help) usage exit 1;;
|
||||
-n|--name) name=$2; shift 2;;
|
||||
-p|--path) path=$2; shift 2;;
|
||||
--rootfs) rootfs=$2; shift 2;;
|
||||
--mapped-uid) LXC_MAPPED_UID=$2; shift 2;;
|
||||
--mapped-gid) LXC_MAPPED_GID=$2; shift 2;;
|
||||
--) shift 1; break ;;
|
||||
*) break ;;
|
||||
esac
|
||||
done
|
||||
|
||||
if [ "$(id -u)" != "0" ]; then
|
||||
echo "This script should be run as 'root'"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
if [ -z "$path" ]; then
|
||||
echo "'path' parameter is required"
|
||||
# Check that we have all variables we need
|
||||
if [ -z "${name}" ] || [ -z "${path}" ] || [ -z "${rootfs}" ]; then
|
||||
echo "ERROR: Please pass the name, path, and rootfs for the container" 1>&2
|
||||
exit 1
|
||||
fi
|
||||
|
||||
# detect rootfs
|
||||
config="$path/config"
|
||||
if [ -z "$rootfs" ]; then
|
||||
if grep -q '^lxc.rootfs.path' $config 2>/dev/null ; then
|
||||
rootfs=$(awk -F= '/^lxc.rootfs.path =/{ print $2 }' $config)
|
||||
else
|
||||
rootfs=$path/rootfs
|
||||
fi
|
||||
if grep -q '^lxc.rootfs.path' "${config}" 2> /dev/null ; then
|
||||
rootfs=$(awk -F= '/^lxc.rootfs.path =/{ print $2 }' "${config}")
|
||||
else
|
||||
rootfs="${path}/rootfs"
|
||||
fi
|
||||
fi
|
||||
|
||||
install_busybox $rootfs $name
|
||||
if [ $? -ne 0 ]; then
|
||||
echo "failed to install busybox's rootfs"
|
||||
exit 1
|
||||
if ! install_busybox "${rootfs}" "${name}"; then
|
||||
echo "ERROR: Failed to install rootfs"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
configure_busybox $rootfs
|
||||
if [ $? -ne 0 ]; then
|
||||
echo "failed to configure busybox template"
|
||||
exit 1
|
||||
if ! configure_busybox "${rootfs}"; then
|
||||
echo "ERROR: Failed to configure busybox"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
copy_configuration $path $rootfs $name
|
||||
if [ $? -ne 0 ]; then
|
||||
echo "failed to write configuration file"
|
||||
exit 1
|
||||
if ! copy_configuration "${path}" "${rootfs}" "${name}"; then
|
||||
echo "ERROR: Failed to write config file"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
remap_userns $path
|
||||
if [ $? -ne 0 ]; then
|
||||
echo "failed to remap files to user"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
if [ -n "$SSH" ]; then
|
||||
case "$SSH" in
|
||||
"dropbear")
|
||||
install_dropbear
|
||||
if [ $? -ne 0 ]; then
|
||||
echo "Unable to install 'dropbear' ssh utility"
|
||||
exit 1
|
||||
fi ;;
|
||||
"openssh")
|
||||
install_openssh
|
||||
if [ $? -ne 0 ]; then
|
||||
echo "Unable to install 'OpenSSH' utility"
|
||||
exit 1
|
||||
fi ;;
|
||||
*)
|
||||
echo "$SSH: unrecognized ssh utility"
|
||||
exit 1
|
||||
esac
|
||||
else
|
||||
which dropbear >/dev/null 2>&1
|
||||
if [ $? -eq 0 ]; then
|
||||
install_dropbear
|
||||
fi
|
||||
if ! remap_userns "${path}"; then
|
||||
echo "ERROR: Failed to change idmappings"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
Loading…
Reference in New Issue
Block a user