#!/usr/bin/env bash

# -------------
# --- Some functions
# -------------
echononl(){
   echo X\\c > /tmp/shprompt$$
   if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
      echo -e -n "$*\\c" 1>&2
   else
       echo -e -n "$*" 1>&2
   fi
   rm /tmp/shprompt$$
}

fatal(){
   echo ""
   echo -e "fatal error: $*"
   echo ""
   echo -e "\t\033[31m\033[1mInstalllation will be interrupted\033[m\033[m"
   echo ""
   exit 1
}

error(){
   echo ""
   echo -e "\t[ \033[31m\033[1mFehler\033[m ]: $*"
   echo ""
}

warn (){
   echo ""
   echo -e "\t[ \033[33m\033[1mWarning\033[m ]: $*"
   echo ""
}

info (){
   echo ""
   echo -e "\t[ \033[32m\033[1mInfo\033[m ]: $*"
   echo ""
}

echo_done() {
   echo -e "\033[80G[ \033[32mdone\033[m ]"
}
echo_ok() {
   echo -e "\033[80G[ \033[32mok\033[m ]"
}
echo_warning() {
   echo -e "\033[80G[ \033[33m\033[1mwarn\033[m ]"
}
echo_failed(){
   echo -e "\033[80G[ \033[1;31mfailed\033[m ]"
}
echo_skipped() {
   echo -e "\033[80G[ \033[33m\033[1mskipped\033[m ]"
}

tmp_err_msg=$(mktemp)

# - Is this a systemd system?
# -
if [[ "X$(which systemd)" = "X" ]]; then
   systemd_exists=false
else
   systemd_exists=true
fi

echo ""


# - Install debiab packages for pure-ftp
# -
_needed_packages="pure-ftpd-common pure-ftpd"
echononl "   Install Pure-FTPd from debian packages system"
for _pkg in $_needed_packages ; do
   if aptitude search "$_pkg" | grep " $_pkg " | grep -e "^i" > /dev/null 2>&1 ; then
      continue
   else
      needed_packages="$needed_packages $_pkg"
   fi
done
if [[ -n "$needed_packages" ]] ; then
   DEBIAN_FRONTEND=noninteractive apt-get -y install $needed_packages > /dev/null 2> "$tmp_err_msg"
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $tmp_err_msg)"
   fi
else
   echo_skipped
fi

# - Configure to daemonize (standalone)
# -
echononl "   Configure to daemonize pure-ftpd"
perl -i -n -p -e 's#^([ ]*)(STANDALONE_OR_INETD=.*)#\1\#\# \2\nSTANDALONE_OR_INETD=standalone#g' \
   /etc/default/pure-ftpd-common > /dev/null 2> "$tmp_err_msg"
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $tmp_err_msg)"
fi

echononl "   Backup existing Configuration Directory"
if [[ -d "/etc/pure-ftpd/conf" ]]; then
   cp -a /etc/pure-ftpd/conf /etc/pure-ftpd/conf.$(date +%Y-%m-%d-%H%M) > /dev/null 2> "$tmp_err_msg"
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $tmp_err_msg)"
   fi
else
   echo_skipped
   fatal "Configuration directory '/etc/pure-ftpd/conf' not found!"
fi


echononl "   Changes Configuration directory \"/etc/pure-ftpd/conf\""
cd /etc/pure-ftpd/conf > /dev/null 2> "$tmp_err_msg"
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $tmp_err_msg)"
fi

# - Configure PureFTP
# -
installation_failed=false
echononl "   Configure Pure-FTPd"
echo ",21" > /etc/pure-ftpd/conf/Bind
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
   error "$(cat $tmp_err_msg)"
fi
echo "50000 50400" > /etc/pure-ftpd/conf/PassivePortRange
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
   error "$(cat $tmp_err_msg)"
fi
echo "1000" > /etc/pure-ftpd/conf/MinUID
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
   error "$(cat $tmp_err_msg)"
fi
echo "UTF-8" > /etc/pure-ftpd/conf/FSCharset
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
fi
echo "80" > /etc/pure-ftpd/conf/MaxDiskUsage
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
fi
echo 'ALL:!aNULL:!SSLv3' > /etc/pure-ftpd/conf/TLSCipherSuite
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
fi
echo "1" > /etc/pure-ftpd/conf/TLS
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
fi
echo "yes" > /etc/pure-ftpd/conf/NoAnonymous
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
fi
echo "yes" > /etc/pure-ftpd/conf/AnonymousCantUpload
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
fi
echo "yes" > /etc/pure-ftpd/conf/DontResolve
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
fi
echo "ftp" > /etc/pure-ftpd/conf/SyslogFacility
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
fi
echo "clf:/var/log/pure-ftpd/transfer.log"  > /etc/pure-ftpd/conf/AltLog
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
fi
echo "yes" > /etc/pure-ftpd/conf/DisplayDotFiles
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
fi
echo "no" > /etc/pure-ftpd/conf/ProhibitDotFilesWrite
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
fi
echo "no" > /etc/pure-ftpd/conf/ProhibitDotFilesRead
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
fi
echo "no" > /etc/pure-ftpd/conf/UnixAuthentication
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
fi
echo "no" > /etc/pure-ftpd/conf/PAMAuthentication
if [[ "$?" -ne 0 ]] ; then
   installation_failed=true
fi
echo "/etc/pure-ftpd/pureftpd.pdb" > /etc/pure-ftpd/conf/PureDB
if $installation_failed ; then
   echo_failed
else
   echo_ok
fi


echononl "   Configure authentication method \"PureDB\""
if [[ ! -h /etc/pure-ftpd/auth/50pure ]]; then
   ln -s ../conf/PureDB /etc/pure-ftpd/auth/50pure > /dev/null 2> "$tmp_err_msg"
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $tmp_err_msg)"
   fi
else
   echo_skipped
fi

echononl "   Create initial passwd file (pureftpd.passwd)"
if [[ ! -f /etc/pure-ftpd/pureftpd.passwd ]]; then
   touch /etc/pure-ftpd/pureftpd.passwd > /dev/null 2> "$tmp_err_msg"
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $tmp_err_msg)"
   fi
else
   echo_skipped
fi

echononl "   Create initial passwd database (pureftpd.pdb)"
if [[ ! -f /etc/pure-ftpd/pureftpd.pdb ]]; then
   touch /etc/pure-ftpd/pureftpd.pdb > $tmp_err_msg 2>&1
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $tmp_err_msg)"
   fi
else
   echo_skipped
fi

subj="
C=DE
ST=Berlin
localityName=Berlin
O=O.OPEN
organizationalUnitName=Network Services
commonName=$(hostname -f)
emailAddress=argus@oopen.de
"

subj="
C=DE
ST=Berlin
localityName=Berlin
O=O.OPEN
organizationalUnitName=Network Services
commonName=$(hostname -f)
emailAddress=argus@oopen.de
"
echononl "   Create certificate 'pure-ftpd.pem'.."
openssl req -batch -x509 -nodes -days 7304 -newkey rsa:2048 \
   -subj "$(echo -n "$subj" | tr "\n" "/")" \
   -keyout /etc/ssl/private/pure-ftpd.pem \
   -out /etc/ssl/private/pure-ftpd.pem > $tmp_err_msg 2>&1
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $tmp_err_msg)"
fi

echononl "   DH parameters file 'pure-ftpd-dhparams.pem'"
openssl dhparam -out /etc/ssl/private/pure-ftpd-dhparams.pem 2048 > $tmp_err_msg 2>&1
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $tmp_err_msg)"
fi

# - Configure syslogd matching the configuration od amavisd
# -
echononl "   Configure syslogd matching the ftp syslog facility"
cat << EOF > /etc/rsyslog.d/pure-ftpd.conf
ftp.*  /var/log/pure-ftpd/ftp.log
& ~
EOF
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
fi

echononl "   Restart syslog daemon (rsyslog)"
if $systemd_exists ; then
   systemctl restart rsyslog > /dev/null 2> $tmp_err_msg
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $tmp_err_msg)"
   fi
else
   /etc/init.d/rsyslog restart > /dev/null 2> $tmp_err_msg
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $tmp_err_msg)"
   fi
fi

if [[ ! -f /etc/ssl/private/pure-ftpd.pem ]] && [[ ! -h /etc/ssl/private/pure-ftpd.pem ]]; then
   warn "No certificate/key for pure-ftpd is present (/etc/ssl/private/pure-ftpd.pem).\n                     pure.ftpd daemon will not start.\n\n                     Create Certificate and DH parameters file:\n                        openssl req -x509 -nodes -days 97300 -newkey rsa:2048 -keyout /etc/ssl/private/pure-ftpd.pem -out /etc/ssl/private/pure-ftpd.pem\n                        openssl dhparam -out /etc/ssl/private/pure-ftpd-dhparams.pem 2048\n\n                     Restart pure-ftpd service."
else
   echononl "   (Re)start PureFTPd daemon (pure-ftpd)"
   if $systemd_exists ; then
      systemctl restart pure-ftpd > /dev/null 2> $tmp_err_msg
      if [[ $? -eq 0 ]] ; then
         echo_ok
      else
         echo_failed
         error "$(cat $tmp_err_msg)"
      fi
   else
      /etc/init.d/pure-ftpd restart > /dev/null 2> $tmp_err_msg
      if [[ $? -eq 0 ]] ; then
         echo_ok
      else
         echo_failed
         error "$(cat $tmp_err_msg)"
      fi
   fi
fi

echo
rm -f $tmp_err_msg
exit 0