bdisk/extra/pre-build.d/usr/lib/initcpio/install/ssh

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2014-12-19 14:13:30 -05:00
#!/bin/bash
get_fingerprint() {
local keyfile="$1"
dropbearkey -y -f "${keyfile}" | sed -n '/^Fingerprint:/ {s/Fingerprint: *//; p}'
}
display_fingerprints() {
local keyfile
for keyfile in "/etc/dropbear/dropbear_dss_host_key" "/etc/dropbear/dropbear_rsa_host_key" ; do
if [ ! -r "${keyfile}" ] ; then
return 1
fi
echo "$(basename "${keyfile}") : $(get_fingerprint "${keyfile}")"
done
}
copy_openssh_keys() {
local osshrsa="/etc/ssh/ssh_host_rsa_key"
local osshdsa="/etc/ssh/ssh_host_dsa_key"
local dbpre="/etc/dropbear/dropbear_"
[ -f "$osshrsa" ] && [ -f "$osshdsa" ] || return 1
dropbearconvert openssh dropbear $osshrsa ${dbpre}rsa_host_key
dropbearconvert openssh dropbear $osshdsa ${dbpre}dss_host_key
}
generate_keys() {
local keyfile keytype
for keytype in dss rsa ; do
keyfile="/etc/dropbear/dropbear_${keytype}_host_key"
echo "Generating ${keytype} host key for dropbear ..."
dropbearkey -t "${keytype}" -f "${keyfile}"
done
}
make_etc_passwd() {
echo 'root:x:0:0:root:/:/bin/ash' > "${TMPDIR}"/passwd
}
build ()
{
#
# Begin real processing
#
# Are we even needed?
if [ ! -e "/etc/dropbear/root_key" ]; then
echo "There is no root key in /etc/dropbear/root_key existent; exit"
return 0
fi
# if TMPDIR is set leave it alone otherwise set
[ -z $TMPDIR ] && TMPDIR='/tmp/dropbear_initrd_encrypt'
# check if TMPDIR exsists if not make it
[ -d $TMPDIR ] || mkdir -p $TMPDIR
umask 0022
[ -d /etc/dropbear ] && mkdir -p /etc/dropbear
display_fingerprints || copy_openssh_keys || generate_keys
[ -e "${TMPDIR}/passwd" ] && ( grep -q -e '^root:' "${TMPDIR}/passwd" ) || make_etc_passwd
add_checked_modules "/drivers/net/"
add_binary "rm"
add_binary "dropbear"
add_binary "killall"
echo '/bin/ash' > "${TMPDIR}"/shells
add_file "${TMPDIR}/shells" "/etc/shells"
cat /etc/dropbear/root_key > "${TMPDIR}"/authorized_keys
add_dir "/.ssh"
add_file "${TMPDIR}/authorized_keys" "/.ssh/authorized_keys"
add_file "${TMPDIR}/passwd" "/etc/passwd"
add_dir "/etc/dropbear"
add_file "/etc/dropbear/dropbear_rsa_host_key"
add_file "/etc/dropbear/dropbear_dss_host_key"
add_file "/lib/libnss_files.so.2"
add_binary "ip" "/sbin/ip"
add_dir "/var/run"
touch "${TMPDIR}"/lastlog
add_dir "/var/log"
add_file "${TMPDIR}/lastlog" "/var/log/lastlog"
add_binary "/usr/lib/initcpio/ipconfig" "/bin/ipconfig"
# cleanup
rm "${TMPDIR}/shells"
rm "${TMPDIR}/authorized_keys"
rm "${TMPDIR}/passwd"
rm "${TMPDIR}/lastlog"
add_runscript
}
help ()
{
cat<<HELPEOF
Allow SSH access to an initial environment for debugging.
HELPEOF
}