#!/bin/sh
#
# ssh-user-config, Copyright 2000, Red Hat Inc.
#
# This file is part of the Cygwin port of OpenSSH.

progname=$0
auto_answer=""
auto_passphrase="no"
passphrase=""

request()
{
  if [ "${auto_answer}" = "yes" ]
  then
    return 0
  elif [ "${auto_answer}" = "no" ]
  then
    return 1
  fi

  answer=""
  while [ "X${answer}" != "Xyes" -a "X${answer}" != "Xno" ]
  do
    echo -n "$1 (yes/no) "
    read answer
  done
  if [ "X${answer}" = "Xyes" ]
  then
    return 0
  else
    return 1
  fi
}

# Check options

while :
do
  case $# in
  0)
    break
    ;;
  esac

  option=$1
  shift

  case "$option" in
  -d | --debug )
    set -x
    ;;

  -y | --yes )
    auto_answer=yes
    ;;

  -n | --no )
    auto_answer=no
    ;;

  -p | --passphrase )
    with_passphrase="yes"
    passphrase=$1
    shift
    ;;

  *)
    echo "usage: ${progname} [OPTION]..."
    echo
    echo "This script creates an OpenSSH user configuration."
    echo
    echo "Options:"
    echo "    --debug      -d        Enable shell's debug output."
    echo "    --yes        -y        Answer all questions with \"yes\" automatically."
    echo "    --no         -n        Answer all questions with \"no\" automatically."
    echo "    --passphrase -p word   Use \"word\" as passphrase automatically."
    echo
    exit 1
    ;;

  esac
done

# Ask user if user identity should be generated

if [ "X${HOME}" = "X" ]
then
  echo '$HOME is nonexistant. Cannot create user identity files.'
  exit 1
fi

if [ ! -d "${HOME}" ]
then
  echo '$HOME is not a valid directory. Cannot create user identity files.'
  exit 1
fi

# If HOME is the root dir, set HOME to empty string to avoid error messages
# in subsequent parts of that script.
if [ "X${HOME}" = "X/" ]
then
  HOME=''
fi

if [ -e "${HOME}/.ssh" -a ! -d "${HOME}/.ssh" ]
then
  echo '$HOME/.ssh is existant but not a directory. Cannot create user identity files.'
  exit 1
fi

if [ ! -e "${HOME}/.ssh" ]
then
  mkdir "${HOME}/.ssh"
  if [ ! -e "${HOME}/.ssh" ]
  then
    echo "Creating users ${HOME}/.ssh directory failed"
    exit 1
  fi
fi

if [ ! -f "${HOME}/.ssh/identity" ]
then
  if request "Shall I create an SSH1 RSA identity file for you?"
  then
    echo "Generating ${HOME}/.ssh/identity"
    if [ "${with_passphrase}" = "yes" ]
    then
      ssh-keygen -t rsa1 -N "${passphrase}" -f "${HOME}/.ssh/identity" > /dev/null
    else
      ssh-keygen -t rsa1 -f "${HOME}/.ssh/identity" > /dev/null
    fi
    if request "Do you want to use this identity to login to this machine?"
    then
      echo "Adding to ${HOME}/.ssh/authorized_keys"
      cat "${HOME}/.ssh/identity.pub" >> "${HOME}/.ssh/authorized_keys"
    fi
  fi
fi

if [ ! -f "${HOME}/.ssh/id_rsa" ]
then
  if request "Shall I create an SSH2 RSA identity file for you? (yes/no) "
  then
    echo "Generating ${HOME}/.ssh/id_rsa"
    if [ "${with_passphrase}" = "yes" ]
    then
      ssh-keygen -t rsa -N "${passphrase}" -f "${HOME}/.ssh/id_rsa" > /dev/null
    else
      ssh-keygen -t rsa -f "${HOME}/.ssh/id_rsa" > /dev/null
    fi
    if request "Do you want to use this identity to login to this machine?"
    then
      echo "Adding to ${HOME}/.ssh/authorized_keys2"
      cat "${HOME}/.ssh/id_rsa.pub" >> "${HOME}/.ssh/authorized_keys2"
    fi
  fi
fi

if [ ! -f "${HOME}/.ssh/id_dsa" ]
then
  if request "Shall I create an SSH2 DSA identity file for you? (yes/no) "
  then
    echo "Generating ${HOME}/.ssh/id_dsa"
    if [ "${with_passphrase}" = "yes" ]
    then
      ssh-keygen -t dsa -N "${passphrase}" -f "${HOME}/.ssh/id_dsa" > /dev/null
    else
      ssh-keygen -t dsa -f "${HOME}/.ssh/id_dsa" > /dev/null
    fi
    if request "Do you want to use this identity to login to this machine?"
    then
      echo "Adding to ${HOME}/.ssh/authorized_keys2"
      cat "${HOME}/.ssh/id_dsa.pub" >> "${HOME}/.ssh/authorized_keys2"
    fi
  fi
fi

echo
echo 'Please care for setting your home directory in /etc/passwd as well.'
echo 'Otherwise you will get problems running ssh!!!'
echo
echo "Configuration finished. Have fun!"