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

#!/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 "/usr/bin/rm"
  add_binary "/usr/bin/dropbear"
  add_binary "/usr/bin/killall"
  add_binary "/usr/bin/pkill"

  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
}