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2014-05-19 Julien Coloos <julien.coloos [at] gmail [dot] com>
* v0.1-1
* Code adapted from dropbear_initrd_encrypt (https://aur.archlinux.org/packages/dropbear_initrd_encrypt/)
Reworked code
Dropped non-LUKS support
Rely on /etc/crypttab
Handle multiple devices to unlock
Merged dropbear and encryptssh hooks
Better resources cleanup

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For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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# Maintainer: Julien Coloos <julien.coloos [at] gmail [dot] com>
pkgname=initrd-ssh-cryptsetup
pkgver=0.1
pkgrel=1
pkgdesc="Allows for LUKS-encrypted devices to be unlocked remotely over SSH"
arch=('any')
url="https://github.com/suiryc/archlinux-$pkgname"
license=('GPL3')
depends=('dropbear' 'cryptsetup' 'mkinitcpio-nfs-utils' 'psmisc' 'iproute2')
install=$pkgname.install
changelog='ChangeLog'
source=("http://julien.coloos.free.fr/archlinux/$pkgname-$pkgver.tar.xz" "$pkgname.install")
md5sums=('cd16f62be49eef3fa178ce292de64f48'
'a703663472bbd50882a11f6b2cfccbf0')
package() {
install -Dm644 "$srcdir/src/install/ssh-cryptsetup" "$pkgdir/usr/lib/initcpio/install/ssh-cryptsetup"
install -Dm644 "$srcdir/src/hooks/ssh-cryptsetup" "$pkgdir/usr/lib/initcpio/hooks/ssh-cryptsetup"
}

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Personal ArchLinux package combining dropbear and cryptsetup in initrd for unlocking LUKS-encrypted devices either locally (boot console) or remotely over SSH.
The code was reworked from [dropbear_initrd_encrypt](https://aur.archlinux.org/packages/dropbear_initrd_encrypt/).
## Installation
After cloning the repo, installation is done as for an AUR package.
## Configuration
As explained upon installation, the following things need to be done:
* add the SSH public key to `/etc/dropbear/initrd.authorized_keys`
* add the `ip=` kernel command parameter to the bootloader configuration (see https://wiki.archlinux.org/index.php/Mkinitcpio#Using_net)
* in the `HOOKS` section of `/etc/mkinitcpio.conf`, add `ssh-cryptsetup` before `filesystems`; then rebuild the initramfs: `mkinitcpio -p linux`
The LUKS-encrypted devices to unlock are derived from `/etc/crypttab`.
The SSH listening port (22 by default) can be changed by setting the `sshcs_opt_listen` option in `/etc/dropbear/initrd.env` (file is sourced in initrd shell).
For example:
sshcs_opt_listen=2222

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#!/bin/bash
post_install() {
local dropbear_authorized_keys="/etc/dropbear/initrd.authorized_keys"
local etc_dropbear=$(dirname "${dropbear_authorized_keys}")
[ -d "${etc_dropbear}" ] || mkdir -p "${etc_dropbear}"
[ -e "${dropbear_authorized_keys}" ] || touch "${dropbear_authorized_keys}"
chmod 600 "${dropbear_authorized_keys}"
cat <<EOF
Add the SSH public key to '${dropbear_authorized_keys}'.
Add the 'ip=' kernel command parameter to the bootloader configuration
(see https://wiki.archlinux.org/index.php/Mkinitcpio#Using_net).
In the 'HOOKS' section of '/etc/mkinitcpio.conf', add 'ssh-cryptsetup'
before 'filesystems'. And rebuild the initramfs: 'mkinitcpio -p linux'
EOF
}
post_remove() {
cat <<EOF
Remove the 'ip=' kernel command parameter from the bootloader configuration.
In the 'HOOKS' section of '/etc/mkinitcpio.conf', remove 'ssh-cryptsetup'.
And rebuild the initramfs: 'mkinitcpio -p linux'
EOF
}
post_upgrade() {
post_install
}

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#!/usr/bin/ash
sshcs_net_start() {
# we must have an 'ip' setting, and a device in it
[ -z "${ip}" ] && [ -n "${nfsaddrs}" ] && ip="${nfsaddrs}"
[ -z "${ip}" ] && return 1
net_device=$(echo ${ip} | cut -d: -f6)
[ -z "${net_device}" ] && return 1
# Setup network and save some values
# Note: some useful redirection means ('< <(...)' and '<<< "$(...)"') are
# not supported in the available shell. So we have to write code in a
# temporary file and 'source' it since '... | while read ...' spawns a
# subshell from which outer variables cannot be altered.
: > "${net_env}"
ipconfig "ip=${ip}" | while read line; do
[ "${line#"IP-Config:"}" != "${line}" ] && continue
line="$(echo "${line}" | sed -e 's/ :/:/g;s/: /=/g')"
for iparg in ${line}; do
case "${iparg}" in
address=*|netmask=*|gateway=*|dns0=*|dns1=*)
echo "net_${iparg}" >> "${net_env}"
;;
esac
done
done
. "${net_env}"
rm -f "${net_env}"
echo "IP-Config: device=${net_device} ip=${net_address}/${net_netmask} gw=${net_gateway} dns0=${net_dns0} dns1=${net_dns1}"
[ -n "${net_address}" ]
}
sshcs_dropbear_unlock() {
local dev_pts_mounted=0
local listen=
# ensure /dev/pts is present
if [ ! -d "/dev/pts" ]; then
mkdir -p "/dev/pts"
mount -t devpts devpts "/dev/pts"
dev_pts_mounted=1
fi
# /etc/passwd file for the root user
echo "root:x:0:0:root:/root:${dropbear_login_shell}" > "/etc/passwd"
echo "${dropbear_login_shell}" > "/etc/shells"
# root login script
cat <<EOF > "${dropbear_login_shell}"
#!/usr/bin/ash
. "/init_functions"
if [ ! -f "${dropbear_cryptsetup_script}" ]; then
err "No cryptsetup script present! Please retry."
exit 0
fi
if [ -c "/dev/mapper/control" ]; then
CSQUIET=
. "${dropbear_cryptsetup_script}"
echo ""
echo "cryptsetup succeeded! Boot sequence should go on."
echo "Please wait and retry for standard SSH service."
else
err "Device resources missing! Please retry."
fi
echo ""
EOF
chmod a+x "${dropbear_login_shell}"
[ ! -d "/var/log" ] && mkdir -p "/var/log"
touch "/var/log/lastlog"
[ -e "${dropbear_env}" ] && . "${dropbear_env}"
[ -n "${sshcs_opt_listen}" ] && sshcs_opt_listen="-p ${sshcs_opt_listen}"
msg "Starting dropbear ..."
dropbear -Emsgjk -P "${path_dropbear_pid}" ${sshcs_opt_listen}
# actual script (shared with SSH login) unlocking encrypted devices
. "${dropbear_cryptsetup_script}"
# cleanup dropbear
if [ -f "${path_dropbear_pid}" ]; then
msg "Stopping dropbear ..."
kill $(cat "${path_dropbear_pid}")
rm -f "${path_dropbear_pid}"
fi
rm -f "${dropbear_cryptsetup_script}" "${dropbear_login_shell}" "/etc/passwd" "/etc/shells" "/var/log/lastlog"
# cleanup /dev/pts if necessary
if [ ${dev_pts_mounted} -ne 0 ]; then
umount "/dev/pts"
rm -R "/dev/pts"
fi
}
sshcs_net_done() {
# we are done with the network
if [ -n "${net_device}" ]; then
ip addr flush dev "${net_device}"
ip link set dev "${net_device}" down
fi
}
sshcs_cryptpart_process() {
# ensure there is a device (handle 'UUID=' format)
[ -z "${cryptdev}" ] && return 0
[ "${cryptdev#UUID=}" != "${cryptdev}" ] && cryptdev="/dev/disk/by-uuid/${cryptdev#UUID=}"
# get crypt options
cryptargs=
for cryptopt in ${cryptoptions//,/ }; do
case ${cryptopt} in
allow-discards)
cryptargs="${cryptargs} --allow-discards"
;;
luks)
;;
*)
echo "Device ${cryptdev} encryption option '${cryptopt}' not known, ignoring."
;;
esac
done
# ensure device is encrypted and handled
cryptdev_orig=${cryptdev}
if cryptdev=$(resolve_device "${cryptdev_orig}" ${rootdelay}); then
if cryptsetup isLuks "${cryptdev}" >/dev/null 2>&1; then
# update script used to unlock device either in console or SSH
[ -s "${dropbear_cryptsetup_script}" ] || cat <<EOF > "${dropbear_cryptsetup_script}"
cycle_or_retry() {
local res
read -n 1 -s -t 5 -p "Whithin 5s press 'P' to poweroff, 'R' to reboot or any other key to retry. " res
echo ""
if [ "\${res}" = "P" ]; then
poweroff -f
elif [ "\${res}" = "R" ]; then
reboot -f
fi
}
EOF
cat <<EOF >> "${dropbear_cryptsetup_script}"
# loop until device is available
while [ ! -e "/dev/mapper/${cryptname}" ]; do
if cryptsetup open --type "${crypttype}" "${cryptdev}" "${cryptname}" "${cryptargs}" "\${CSQUIET}"; then
if poll_device "/dev/mapper/${cryptname}" ${rootdelay}; then
killall cryptsetup > /dev/null 2>&1
break
fi
err "Device still not mapped! Please wait or retry."
elif [ ! -e "/dev/mapper/${cryptname}" ]; then
err "cryptsetup failed! Please retry."
else
break
fi
cycle_or_retry
done
EOF
else
err "Failed to manage encrypted device ${cryptdev_orig}: not a LUKS volume."
fi
fi
}
run_hook() {
local etc_crypttab="/etc/crypttab"
local dropbear_env="/etc/dropbear/initrd.env"
local path_dropbear_pid="/.dropbear.pid"
local dropbear_login_shell="/.cryptsetup_shell.sh"
local dropbear_cryptsetup_script="/.cryptsetup_script.sh"
local net_env="/.net_env.sh"
local line iparg net_address net_netmask net_gateway net_dns0 net_dns1
local cryptdev cryptdev_orig crypttype cryptname cryptpass cryptoptions cryptopt cryptargs CSQUIET
# sanity check: crypttab should be present
[ ! -e "${etc_crypttab}" ] && return 0
modprobe -a -q dm-crypt >/dev/null 2>&1
[ "${quiet}" = "y" ] && CSQUIET=">/dev/null"
umask 0022
# start and check network
if ! sshcs_net_start; then
err "Net interface not available! Skipping crypt remote unlocking."
# stop the network if possible
sshcs_net_done
return 0
fi
# check encrypted devices to handle
cryptdev=
crypttype=luks
while read cryptname cryptdev cryptpass cryptoptions; do
# skip comment lines
[ "${cryptname:0:1}" = "#" ] && continue
# skip devices with given password
[ -n "${cryptpass}" ] && [ "${cryptpass}" != "none" ] && [ "${cryptpass}" != "-" ] && continue
sshcs_cryptpart_process
done < "${etc_crypttab}"
if [ ! -e "${dropbear_cryptsetup_script}" ]; then
err "No encrypted device found! Skipping crypt remote unlocking."
# don't forget to stop the network
sshcs_net_done
return 0
fi
# time to unlock (through console or dropbear)
sshcs_dropbear_unlock
# stop the network before going on in boot sequence
sshcs_net_done
}

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#!/bin/bash
sshcs_check_nonempty() {
local filepath="$1"
[ -e "${filepath}" ] && grep -q -v '^\s*\(#\|$\)' "${filepath}"
}
sshcs_check_keys() {
local dropbear_keyfile
local openssh_keyfile
local fingerprint
for keytype in "${dropbear_key_types[@]}"; do
dropbear_keyfile=${dropbear_keyfile_prefix}${keytype}${dropbear_keyfile_suffix}
openssh_keyfile=${openssh_keyfile_prefix}${keytype}${openssh_keyfile_suffix}
# Prefer OpenSSH keys, or generate missing ones
if [ -e "${openssh_keyfile}" ]; then
#echo "Copying OpenSSH ${keytype} host key for dropbear ..."
dropbearconvert openssh dropbear "${openssh_keyfile}" "${dropbear_keyfile}" > /dev/null 2>&1
elif [ ! -e "${dropbear_keyfile}" ]; then
#echo "Generating ${keytype} host key for dropbear ..."
dropbearkey -t "${keytype}" -f "${dropbear_keyfile}" > /dev/null 2>&1
fi
fingerprint=$(dropbearkey -y -f "${dropbear_keyfile}" | sed -n '/^Fingerprint:/ {s/Fingerprint: *//; p}')
echo "$(basename "${dropbear_keyfile}") : ${fingerprint}"
done
}
build() {
local etc_crypttab="/etc/crypttab"
local dropbear_authorized_keys="/etc/dropbear/initrd.authorized_keys"
local dropbear_env="/etc/dropbear/initrd.env"
local dropbear_key_types=( "dss" "rsa" "ecdsa" )
local dropbear_keyfile_prefix="/etc/dropbear/dropbear_"
local dropbear_keyfile_suffix="_host_key"
local openssh_keyfile_prefix="/etc/ssh/ssh_host_"
local openssh_keyfile_suffix="_key"
# Check we are needed
if ! sshcs_check_nonempty "${dropbear_authorized_keys}"; then
echo "There is no root key(s) in ${dropbear_authorized_keys}. Skipping."
return 0
fi
if ! sshcs_check_nonempty "${etc_crypttab}"; then
echo "There is no device in ${etc_crypttab}. Skipping."
return 0
fi
umask 0022
sshcs_check_keys
add_checked_modules "/drivers/net/"
add_module dm-crypt
# Note: crypto modules are necessary
if [ -n "${CRYPTO_MODULES}" ]; then
local mod
for mod in ${CRYPTO_MODULES}; do
add_module "${mod}"
done
else
add_all_modules "/crypto/"
fi
# Note: dmsetup is necessary for device mapper features
add_binary "cryptsetup"
add_binary "dmsetup"
add_binary "dropbear"
add_binary "ip"
add_binary "/usr/lib/initcpio/ipconfig" "/sbin/ipconfig"
add_binary "killall"
# auth-related files
add_file "/lib/libnss_files.so"
# SSH-related files
add_file "${dropbear_authorized_keys}" "/root/.ssh/authorized_keys"
[ -e "${dropbear_env}" ] && add_file "${dropbear_env}"
add_file "/etc/dropbear/dropbear_rsa_host_key"
add_file "/etc/dropbear/dropbear_dss_host_key"
add_file "/etc/dropbear/dropbear_ecdsa_host_key"
# cryptsetup-related files
add_file "${etc_crypttab}"
add_file "/usr/lib/udev/rules.d/10-dm.rules"
add_file "/usr/lib/udev/rules.d/13-dm-disk.rules"
add_file "/usr/lib/udev/rules.d/95-dm-notify.rules"
add_file "/usr/lib/initcpio/udev/11-dm-initramfs.rules" "/usr/lib/udev/rules.d/11-dm-initramfs.rules"
add_runscript
}
help() {
cat <<EOF
This hook allows for LUKS encrypted devices to be unlocked either locally
(boot console) or remotely over SSH.
Network is configured with 'ip=' kernel parameter (see 'mkinitcpio-nfs-utils').
Authorized SSH key(s) must be present in '/etc/dropbear/initrd.authorized_keys'.
LUKS encrypted devices to unlock are derived from '/etc/crypttab', which must
be present.
Listening port (if not 22) can be set with the option 'sshcs_opt_listen' in
'/etc/dropbear/initrd.env' (file is sourced in initrd shell).
Each SSH server key ('dropbear_rsa_host_key', 'dropbear_dss_host_key' and
'dropbear_ecdsa_host_key' in '/etc/dropbear' folder) is imported from OpenSSH
if present or generated if missing. Fingerprints are displayed upon building
the initramfs image.
EOF
}