122 lines
4.1 KiB
Bash
122 lines
4.1 KiB
Bash
#!/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}") : ${fingerprint}"
|
|
done
|
|
}
|
|
|
|
build() {
|
|
local etc_crypttab="/etc/crypttab"
|
|
local dropbear_authorized_keys="/etc/dropbear/initrd.authorized_keys"
|
|
local sshcs_env="/etc/initcpio/sshcs_env"
|
|
local dropbear_key_types=( "dss" "rsa" "ecdsa" )
|
|
local dropbear_keyfile_prefix="/etc/dropbear/dropbear_"
|
|
local dropbear_keyfile_suffix="_host_key"
|
|
local openssh_keyfile_prefix="/etc/ssh/ssh_host_"
|
|
local openssh_keyfile_suffix="_key"
|
|
|
|
# Check we are needed
|
|
if ! sshcs_check_nonempty "${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"
|
|
|
|
# Our hook files
|
|
[ -e "${sshcs_env}" ] && add_file "${sshcs_env}"
|
|
|
|
# auth-related files
|
|
add_file "/lib/libnss_files.so"
|
|
|
|
# SSH-related files
|
|
add_file "${dropbear_authorized_keys}" "/root/.ssh/authorized_keys"
|
|
add_file "/etc/dropbear/dropbear_rsa_host_key"
|
|
add_file "/etc/dropbear/dropbear_dss_host_key"
|
|
add_file "/etc/dropbear/dropbear_ecdsa_host_key"
|
|
|
|
# cryptsetup-related files
|
|
add_file "${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.
|
|
Some options can be set in '/etc/initcpio/sshcs_env' (file is sourced in
|
|
initrd shell):
|
|
* 'sshcs_opt_timeout_ipconfig': time (s) to configure IP
|
|
- default: 10 seconds
|
|
* 'sshcs_opt_listen': listening port (22 by default)
|
|
* 'sshcs_opt_timeout_poweroff': time (s) to unlock devices before automatic
|
|
powering off
|
|
- default (and minimum value): 2 minutes
|
|
- negative value to deactivate
|
|
|
|
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
|
|
}
|