kali-arm/riot.sh

#!/bin/bash
set -e

# This is the riot Kali ARM build script - http://www.riotboard.org
# A trusted Kali Linux image created by Offensive Security - http://www.offensive-security.com

if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root"
   exit 1
fi

if [[ $# -eq 0 ]] ; then
    echo "Please pass version number, e.g. $0 2.0"
    exit 0
fi

basedir=`pwd`/riot-$1

# Custom hostname variable
hostname=${2:-kali}
# Custom image file name variable - MUST NOT include .img at the end.
imagename=${3:-kali-linux-$1-riot}
# Size of image in megabytes (Default is 14000=14GB)
size=14000
# Suite to use.
# Valid options are:
# kali-rolling, kali-dev, kali-bleeding-edge, kali-dev-only, kali-experimental, kali-last-snapshot
# A release is done against kali-last-snapshot, but if you're building your own, you'll probably want to build
# kali-rolling.
suite=kali-rolling

machine=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)

# Make sure that the cross compiler can be found in the path before we do
# anything else, that way the builds don't fail half way through.
export CROSS_COMPILE=arm-linux-gnueabihf-
if [ $(compgen -c $CROSS_COMPILE | wc -l) -eq 0 ] ; then
    echo "Missing cross compiler. Set up PATH according to the README"
    exit 1
fi
# Unset CROSS_COMPILE so that if there is any native compiling needed it doesn't
# get cross compiled.
unset CROSS_COMPILE

# Package installations for various sections.
# This will build a minimal XFCE Kali system with the top 10 tools.
# This is the section to edit if you would like to add more packages.
# See http://www.kali.org/new/kali-linux-metapackages/ for meta packages you can
# use. You can also install packages, using just the package name, but keep in
# mind that not all packages work on ARM! If you specify one of those, the
# script will throw an error, but will still continue on, and create an unusable
# image, keep that in mind.

# Don't add the kernel here.  It depends on flash-kernel which in turn will fail
# when building on amd64, instead we fake a uname/architecture further down and
# actually install the kernel package after compiling it.
arm="kali-linux-arm ntpdate"
base="apt-transport-https apt-utils bash-completion console-setup dialog e2fsprogs ifupdown initramfs-tools inxi iw man-db mlocate netcat-traditional net-tools parted pciutils psmisc rfkill screen tmux unrar usbutils vim wget whiptail zerofree"
desktop="kali-desktop-xfce kali-root-login xserver-xorg-video-fbdev xfonts-terminus xinput"
tools="wireshark"
services="apache2 atftpd"
extras="alsa-utils bc bison bluez bluez-firmware kali-linux-core libnss-systemd libssl-dev triggerhappy"

packages="${arm} ${base} ${services}"
architecture="armhf"
# If you have your own preferred mirrors, set them here.
# After generating the rootfs, we set the sources.list to the default settings.
mirror=http.kali.org

# Set this to use an http proxy, like apt-cacher-ng, and uncomment further down
# to unset it.
#export http_proxy="http://localhost:3142/"

mkdir -p "${basedir}"
cd "${basedir}"

# create the rootfs - not much to modify here, except maybe throw in some more packages if you want.
debootstrap --foreign --keyring=/usr/share/keyrings/kali-archive-keyring.gpg --include=kali-archive-keyring --arch ${architecture} ${suite} kali-${architecture} http://${mirror}/kali

cp /usr/bin/qemu-arm-static kali-${architecture}/usr/bin/

LANG=C systemd-nspawn -M ${machine} -D kali-${architecture} /debootstrap/debootstrap --second-stage

mkdir -p kali-${architecture}/etc/apt/
cat << EOF > kali-${architecture}/etc/apt/sources.list
deb http://${mirror}/kali ${suite} main contrib non-free
EOF

# Set hostname
echo "${hostname}" > kali-${architecture}/etc/hostname

cat << EOF > kali-${architecture}/etc/hosts
127.0.0.1       ${hostname}    localhost
::1             localhost ip6-localhost ip6-loopback
fe00::0         ip6-localnet
ff00::0         ip6-mcastprefix
ff02::1         ip6-allnodes
ff02::2         ip6-allrouters
EOF

mkdir -p kali-${architecture}/etc/network/
cat << EOF > kali-${architecture}/etc/network/interfaces
auto lo
iface lo inet loopback

auto eth0
allow-hotplug eth0
iface eth0 inet dhcp
EOF

cat << EOF > kali-${architecture}/etc/resolv.conf
nameserver 8.8.8.8
EOF

export MALLOC_CHECK_=0 # workaround for LP: #520465
export LC_ALL=C
export DEBIAN_FRONTEND=noninteractive

#mount -t proc proc kali-$architecture/proc
#mount -o bind /dev/ kali-$architecture/dev/
#mount -o bind /dev/pts kali-$architecture/dev/pts

cat << EOF > kali-${architecture}/debconf.set
console-common console-data/keymap/policy select Select keymap from full list
console-common console-data/keymap/full select en-latin1-nodeadkeys
EOF

mkdir -p kali-${architecture}/usr/lib/systemd/system/
cat << 'EOF' > kali-${architecture}/usr/lib/systemd/system/regenerate_ssh_host_keys.service
[Unit]
Description=Regenerate SSH host keys
Before=ssh.service
[Service]
Type=oneshot
ExecStartPre=-/bin/dd if=/dev/hwrng of=/dev/urandom count=1 bs=4096
ExecStartPre=-/bin/sh -c "/bin/rm -f -v /etc/ssh/ssh_host_*_key*"
ExecStart=/usr/bin/ssh-keygen -A -v
ExecStartPost=/bin/sh -c "for i in /etc/ssh/ssh_host_*_key*; do actualsize=$(wc -c <\"$i\") ;if [ $actualsize -eq 0 ]; then echo size is 0 bytes ; exit 1 ; fi ; done ; /bin/systemctl disable regenerate_ssh_host_keys"
[Install]
WantedBy=multi-user.target
EOF
chmod 644 kali-${architecture}/usr/lib/systemd/system/regenerate_ssh_host_keys.service

cat << EOF > kali-${architecture}/usr/lib/systemd/system/smi-hack.service
[Unit]
Description=shared-mime-info update hack
Before=regenerate_ssh_host_keys.service
[Service]
Type=oneshot
Environment=DEBIAN_FRONTEND=noninteractive
ExecStart=/bin/sh -c "rm -rf /etc/ssl/certs/*.pem && dpkg -i /root/*.deb"
ExecStart=/bin/sh -c "dpkg-reconfigure shared-mime-info"
ExecStart=/bin/sh -c "dpkg-reconfigure xfonts-base"
ExecStart=/bin/sh -c "rm -f /root/*.deb"
ExecStart=/bin/sh -c 'apt-get --yes -o dpkg::options::="--force-confnew" -o dpkg::options::="--force-overwrite" install kali-linux-default'
ExecStart=/bin/sh -c "apt-get clean"
ExecStartPost=/bin/systemctl disable smi-hack

[Install]
WantedBy=multi-user.target
EOF
chmod 644 kali-${architecture}/usr/lib/systemd/system/smi-hack.service

# Fake a uname response so that flash-kernel doesn't bomb out.
cat << 'EOF' > kali-${architecture}/root/fakeuname.c
#define _GNU_SOURCE
#include <unistd.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/utsname.h>
#include <stdio.h>
#include <string.h>
/* Fake uname -r because we are in a chroot:
https://gist.github.com/DamnedFacts/5239593
*/
int uname(struct utsname *buf)
{
 int ret;
 ret = syscall(SYS_uname, buf);
 strcpy(buf->release, "5.5.0-kali2-armmp");
 strcpy(buf->machine, "armv7l");
 return ret;
}
EOF

cat << EOF > kali-${architecture}/third-stage
#!/bin/bash
set -e
dpkg-divert --add --local --divert /usr/sbin/invoke-rc.d.chroot --rename /usr/sbin/invoke-rc.d
cp /bin/true /usr/sbin/invoke-rc.d
echo -e "#!/bin/sh\nexit 101" > /usr/sbin/policy-rc.d
chmod 755 /usr/sbin/policy-rc.d

apt-get update

debconf-set-selections /debconf.set
rm -f /debconf.set
apt-get update
apt-get -y install git-core binutils ca-certificates initramfs-tools u-boot-tools
apt-get -y install locales console-common less nano git

# Create kali user with kali password... but first, we need to manually make some groups because they don't yet exist...
# This mirrors what we have on a pre-installed VM, until the script works properly to allow end users to set up their own... user.
# However we leave off floppy, because who a) still uses them, and b) attaches them to an SBC!?
# And since a lot of these have serial devices of some sort, dialout is added as well.
# scanner, lpadmin and bluetooth have to be added manually because they don't
# yet exist in /etc/group at this point.
groupadd -r -g 118 bluetooth
groupadd -r -g 113 lpadmin
groupadd -r -g 122 scanner
groupadd -g 1000 kali

useradd -m -u 1000 -g 1000 -G sudo,audio,bluetooth,cdrom,dialout,dip,lpadmin,netdev,plugdev,scanner,video,kali -s /bin/bash kali
echo "kali:kali" | chpasswd

export DEBIAN_FRONTEND=noninteractive
# This looks weird, but we do it twice because every so often, there's a failure to download from the mirror
# So to workaround it, we attempt to install them twice.
apt-get --yes --allow-change-held-packages -o dpkg::options::=--force-confnew install ${packages} || apt-get --yes --fix-broken install
apt-get --yes --allow-change-held-packages -o dpkg::options::=--force-confnew install ${packages} || apt-get --yes --fix-broken install
apt-get --yes --allow-change-held-packages -o dpkg::options::=--force-confnew install ${desktop} ${extras} ${tools} || apt-get --yes --fix-broken install
apt-get --yes --allow-change-held-packages -o dpkg::options::=--force-confnew install ${desktop} ${extras} ${tools} || apt-get --yes --fix-broken install
apt-get --yes --allow-change-held-packages -o dpkg::options::=--force-confnew dist-upgrade
apt-get --yes --allow-change-held-packages -o dpkg::options::=--force-confnew autoremove

cd /root && gcc -Wall -shared -o libfakeuname.so fakeuname.c
LD_PRELOAD=/root/libfakeuname.so apt-get --yes --allow-change-held-packages install linux-image-armmp u-boot-imx
rm /root/libfakeuname*
cd /

# Because copying in authorized_keys is hard for people to do, let's make the
# image insecure and enable root login with a password.

sed -i -e 's/^#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config

# Regenerated the shared-mime-info database on the first boot
# since it fails to do so properly in a chroot.
systemctl enable smi-hack

# Generate SSH host keys on first run
systemctl enable regenerate_ssh_host_keys
systemctl enable ssh

# Copy bashrc
cp  /etc/skel/.bashrc /root/.bashrc

cd /root
apt download ca-certificates
apt download libgdk-pixbuf2.0-0
apt download fontconfig

rm -f /usr/sbin/policy-rc.d
rm -f /usr/sbin/invoke-rc.d
dpkg-divert --remove --rename /usr/sbin/invoke-rc.d

rm -f /third-stage
EOF

chmod 755 kali-${architecture}/third-stage
LANG=C systemd-nspawn -M ${machine} -D kali-${architecture} /third-stage

cat << EOF > kali-${architecture}/cleanup
#!/bin/bash
rm -rf /root/.bash_history
apt-get update
apt-get clean
rm -f /0
rm -f /hs_err*
rm -f cleanup
rm -f /usr/bin/qemu*
EOF

chmod 755 kali-${architecture}/cleanup
LANG=C systemd-nspawn -M ${machine} -D kali-${architecture} /cleanup

#umount kali-$architecture/proc/sys/fs/binfmt_misc
#umount kali-$architecture/dev/pts
#umount kali-$architecture/dev/
#umount kali-$architecture/proc

# Enable serial console access
echo "T1:23:respawn:/sbin/agetty -L ttymxc1 115200 vt100" >> "${basedir}"/kali-${architecture}/etc/inittab

cat << EOF >> "${basedir}"/kali-${architecture}/etc/udev/links.conf
M   ttymxc1 c   5 1
EOF

cat << EOF >> "${basedir}"/kali-${architecture}/etc/securetty
ttymxc1
EOF

cat << EOF > "${basedir}"/kali-${architecture}/etc/apt/sources.list
deb http://http.kali.org/kali kali-rolling main non-free contrib
deb-src http://http.kali.org/kali kali-rolling main non-free contrib
EOF

# Uncomment this if you use apt-cacher-ng otherwise git clones will fail
#unset http_proxy

cd "${basedir}"

# Mainline u-boot with RIoTboard fixes on top
#wget ftp://ftp.denx.de/pub/u-boot/u-boot-2018.05.tar.bz2
#tar -xf u-boot-2018.05.tar.bz2
#cd u-boot-2018.05
#export CROSS_COMPILE=arm-linux-gnueabihf-
#make riotboard_config
#make -j $(grep -c processor /proc/cpuinfo)
#dd if=u-boot.imx of=$loopdevice bs=1024 seek=1
#cd "${basedir}"

# Generate the bootscript so that u-boot knows where everything is...
#cat << __EOF__ > "${basedir}"/kali-$architecture/boot/bootscript
#fdt_high=0xffffffff
#initrd_high=0xffffffff

#kaddr=0x12000000

#loadkernel=load \${dtype} \${disk}:1 \${loadaddr} zImage

#bargs=setenv bootargs console=ttymxc1,115200n8 rootwait root=PARTUUID=\${btpart} net.ifnames=0 rootfstype=ext3

#loadfdt=load \${dtype} \${disk}:1 0x11000000 \${fdt_file}

#doboot=part uuid \${dtype} \${disk}:2 btpart ; run bargs; if run loadkernel; then echo kernel_loaded ; if run loadfdt; then echo fdt_loaded; bootz \${loadaddr} - 0x11000000 ; else echo fail1 ; fi ; fi ; echo failed to boot
#__EOF__

cp "${basedir}"/../misc/zram "${basedir}"/kali-${architecture}/etc/init.d/zram
chmod 755 "${basedir}"/kali-${architecture}/etc/init.d/zram

sed -i -e 's/^#PermitRootLogin.*/PermitRootLogin yes/' "${basedir}"/kali-${architecture}/etc/ssh/sshd_config

# Create the disk and partition it
echo "Creating image file ${imagename}.img"
dd if=/dev/zero of="${basedir}"/${imagename}.img bs=1M count=${size}
parted ${imagename}.img --script -- mklabel msdos
parted ${imagename}.img --script -- mkpart primary fat32 2048s 264191s
parted ${imagename}.img --script -- mkpart primary ext3 264192s 100%

# Set the partition variables
loopdevice=`losetup -f --show "${basedir}"/${imagename}.img`
device=`kpartx -va ${loopdevice} | sed 's/.*\(loop[0-9]\+\)p.*/\1/g' | head -1`
sleep 5
device="/dev/mapper/${device}"
bootp=${device}p1
rootp=${device}p2

# Create file systems
mkfs.vfat ${bootp}
mkfs.ext3 ${rootp}

# Create the dirs for the partitions and mount them
mkdir -p "${basedir}"/root
mount ${rootp} "${basedir}"/root
mkdir -p "${basedir}"/root/boot
mount ${bootp} "${basedir}"/root/boot

# We do this down here to get rid of the build system's resolv.conf after running through the build.
cat << EOF > kali-${architecture}/etc/resolv.conf
nameserver 8.8.8.8
EOF

echo "Rsyncing rootfs into image file"
rsync -HPavz -q "${basedir}"/kali-${architecture}/ "${basedir}"/root/

# Unmount partitions
sync
umount -l ${bootp}
umount -l ${rootp}
kpartx -dv ${loopdevice}
losetup -d ${loopdevice}

# Don't pixz on 32bit, there isn't enough memory to compress the images.
MACHINE_TYPE=`uname -m`
if [ ${MACHINE_TYPE} == 'x86_64' ]; then
echo "Compressing ${imagename}.img"
pixz "${basedir}"/${imagename}.img "${basedir}"/../${imagename}.img.xz
rm "${basedir}"/${imagename}.img
fi

# Clean up all the temporary build stuff and remove the directories.
# Comment this out to keep things around if you want to see what may have gone
# wrong.
echo "Removing temporary build files"
rm -rf "${basedir}"