141 lines
3.4 KiB
Bash
141 lines
3.4 KiB
Bash
#!/bin/bash
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get_fingerprint() {
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local keyfile="$1"
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dropbearkey -y -f "${keyfile}" | sed -n '/^Fingerprint:/ {s/Fingerprint: *//; p}'
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}
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display_fingerprints() {
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local keyfile
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for keyfile in "/etc/dropbear/dropbear_rsa_host_key" "/etc/dropbear/dropbear_dss_host_key" "/etc/dropbear/dropbear_ecdsa_host_key" ; do
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if [ -s "${keyfile}" ] ; then
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echo "$(basename "${keyfile}") : $(get_fingerprint "${keyfile}")"
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fi
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done
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}
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copy_openssh_keys() {
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local osshrsa="/etc/ssh/ssh_host_rsa_key"
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local osshdsa="/etc/ssh/ssh_host_dsa_key"
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local osshecdsa="/etc/ssh/ssh_host_ecdsa_key"
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local dbpre="/etc/dropbear/dropbear_"
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local return_code=1
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if [ -s "$osshrsa" ]; then
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dropbearconvert openssh dropbear $osshrsa ${dbpre}rsa_host_key
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return_code=0
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fi
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if [ -s "$osshdsa" ]; then
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dropbearconvert openssh dropbear $osshdsa ${dbpre}dss_host_key
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return_code=0
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fi
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if [ -s "$osshecdsa" ]; then
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dropbearconvert openssh dropbear $osshecdsa ${dbpre}ecdsa_host_key
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return_code=0
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fi
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return $return_code
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}
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generate_keys() {
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local keyfile keytype
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for keytype in rsa dss ecdsa ; do
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keyfile="/etc/dropbear/dropbear_${keytype}_host_key"
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if [ ! -s "$keyfile" ]; then
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echo "Generating ${keytype} host key for dropbear ..."
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dropbearkey -t "${keytype}" -f "${keyfile}"
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fi
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done
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}
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make_etc_passwd() {
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echo 'root:x:0:0:root:/:/bin/cryptsetup_shell' > "${TMPDIR}"/passwd
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}
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build ()
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{
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#
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# Begin real processing
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#
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# Are we even needed?
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if [ ! -r "/etc/dropbear/root_key" -o ! -s "/etc/dropbear/root_key" ]; then
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echo "There is no root key in /etc/dropbear/root_key existent; exit"
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return 0
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fi
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# if TMPDIR is set leave it alone otherwise set
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[ -z $TMPDIR ] && TMPDIR='/tmp/dropbear_initrd_encrypt'
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# check if TMPDIR exsists if not make it
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[ -d $TMPDIR ] || mkdir -p $TMPDIR
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umask 0022
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[ -d /etc/dropbear ] && mkdir -p /etc/dropbear
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copy_openssh_keys || generate_keys
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display_fingerprints
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[ -e "${TMPDIR}/passwd" ] && ( grep -q -e '^root:' "${TMPDIR}/passwd" ) || make_etc_passwd
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add_checked_modules "/drivers/net/"
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add_binary "rm"
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add_binary "dropbear"
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cat <<SCRIPTEOF > ${TMPDIR}/cryptsetup_shell
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#!/bin/sh
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if [ -c "/dev/mapper/control" ]; then
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if eval /sbin/cryptsetup luksOpen \`cat /.cryptdev\` \`cat /.cryptname\` \`cat /.cryptargs\` ; then
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echo > /.done
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killall cryptsetup
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fi
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else
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echo "encryption bootup not succeeded. please wait!"
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fi
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SCRIPTEOF
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chmod a+x ${TMPDIR}/cryptsetup_shell
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add_file "${TMPDIR}/cryptsetup_shell" "/bin/cryptsetup_shell"
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echo '/bin/cryptsetup_shell' > "${TMPDIR}"/shells
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add_file "${TMPDIR}/shells" "/etc/shells"
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cat /etc/dropbear/root_key > "${TMPDIR}"/authorized_keys
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add_dir "/.ssh"
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add_file "${TMPDIR}/authorized_keys" "/.ssh/authorized_keys"
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add_file "${TMPDIR}/passwd" "/etc/passwd"
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add_full_dir "/etc/dropbear"
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add_file "/lib/libnss_files.so.2"
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add_dir "/var/run"
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touch "${TMPDIR}"/lastlog
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add_dir "/var/log"
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add_file "${TMPDIR}/lastlog" "/var/log/lastlog"
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# cleanup
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rm "${TMPDIR}/cryptsetup_shell"
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rm "${TMPDIR}/shells"
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rm "${TMPDIR}/authorized_keys"
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rm "${TMPDIR}/passwd"
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rm "${TMPDIR}/lastlog"
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add_runscript
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}
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help ()
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{
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cat<<HELPEOF
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This hook should always be used in combination with the "encrypthssh" hook.
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Add this hook before the "encryptssh", though. Together they allow to enter
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a password for a LUKS encrypted root device either via SSH or locally.
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HELPEOF
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}
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