#!/bin/sh

set -e

[ "$1" = "configure" ] || exit 0
[ "$DEBIAN_SCRIPT_DEBUG" ] && set -vx

# created:     2002-11-15 Bozo Juretic <bjuretic@srce.hr>
# last update: 2007-05-14 Zoran Dzelajlija <zoran.dzelajlija@carnet.hr>
# last update: 2011-04-24 Dinko Korunic <kreator@carnet.hr>
# last update: 2020-08-14 Ivan Rako <Ivan.Rako@CARNET.hr>

# Load CARNET Tools
. /usr/share/carnet-tools/functions.sh

# Load Debconf
#. /usr/share/debconf/confmodule

FTP_CONF=/etc/proftpd/proftpd.conf
FTP_TMP=`mktemp /etc/proftpd/proftpd.conf.XXXXXX`
FTP_OLD=/var/backups/proftpd.conf.bak
SSL_CERT=/etc/ssl/certs/ftpd.pem
SSL_KEY=/etc/ssl/private/ftpd.pem

# Backup stare konfiguracije
cp_backup_conffile $FTP_CONF
cp -p $FTP_CONF $FTP_TMP

# Onemogucavanje Anonymous ftp pristupa
disable_anonymous() {
  if grep -qi "^<Anonymous" $FTP_TMP; then
    echo "CN: Anonymous access has been disabled in $FTP_CONF." 
    # Brisanje Anonymous linija
    sed -n -i -e '/<Anonymous /,/\/Anon/!p' $FTP_TMP
  fi
}

# Popravi razne stvari u confu
fix_conf() {
  if [ -f $FTP_TMP ]; then
    # Stare list opcije
    sed -i -e 's/lsdefaultoptions/ListOptions/i' $FTP_TMP 

    # Stari tcpwin
    sed -i -e "s/tcpreceivewindow/SocketOptions rcvbuf/i" \
           -e "s/tcpsendwindow/SocketOptions sndbuf/i" $FTP_TMP

    # Scoreboard
    sed -i -e "s/\(scoreboardpath.*\)/#\n#ScoreboardPath is deprecated in 1.2.9, use ScoreboardFile instead\n#\1\n#\n#ScoreboardFile\t\/var\/run\/proftpd\/proftpd.scoreboard\n#/i" $FTP_TMP

    # Ubaci pravi hostname
    CARNET_HOSTNAME=`hostname`
    CARNET_DOMAINNAME=`hostname --domain`
    sed -i -e "s/^ServerName.*\"Debian\"/ServerName \"$CARNET_HOSTNAME.$CARNET_DOMAINNAME\"/i" $FTP_TMP 

    # Upali DelayEngine
    sed -i -e 's/^#.*DelayEngine.*/DelayEngine on/i' $FTP_TMP

    # Omoguci da bude standalone servis
    sed -i -e 's/^\(ServerType.*\)inetd/\1standalone/' $FTP_TMP
    update-inetd --disable ftp || true
    #db_set shared/proftpd/inetd_or_standalone "standalone"
    #db_go || true
    #db_stop
  fi
}

# Dodaj TLS konfiguraciju ako je potrebna
add_tls() {
  if [ -f $FTP_TMP ]; then
    cp-update proftpd-cn $FTP_TMP <<EOF
<IfModule mod_tls.c>
  TLSEngine on
  TLSLog /var/log/proftpd/tls.log
  TLSProtocol SSLv23

  # Are clients required to use FTP over TLS when talking to this server?
  TLSRequired off

  # Server's certificate
  TLSRSACertificateFile $SSL_CERT
  TLSRSACertificateKeyFile $SSL_KEY

  # CA the server trusts
  #TLSCACertificateFile /etc/ftpd/root.cert.pem

  # Authenticate clients that want to use FTP over TLS?
  TLSVerifyClient off

  # Allow SSL/TLS renegotiations when the client requests them, but
  # do not force the renegotations.  Some clients do not support
  # SSL/TLS renegotiations; when mod_tls forces a renegotiation, these
  # clients will close the data connection, or there will be a timeout
  # on an idle data connection.
  TLSRenegotiate required off
</IfModule>
EOF
  fi
}

# include za slucaj da sistemac nije prihvatio izmjene od Debiana
include_modules() {
  if [ -f $FTP_TMP ] ; then
    if ! egrep -qi "^[[:space:]]*Include.*/etc/proftpd/modules.conf" $FTP_TMP ; then
      printf "#\n# Includes required DSO modules. This is mandatory in proftpd 1.3\n#\nInclude\t/etc/proftpd/modules.conf\n\n" >$FTP_TMP.tmp.$$
      cat $FTP_TMP >>$FTP_TMP.tmp.$$
      cp_mv $FTP_TMP.tmp.$$ $FTP_TMP
    fi
  fi
}

# Generiranje SSL certifikata
make_ssl_cert() {
  if [ \( ! -f $SSL_CERT \) -o \( ! -f $SSL_KEY \) ] ; then
    echo "CN: Generating SSL certificate... "
    HOSTNAME=`hostname -s`
    FQDN=`hostname -f`
    MAILNAME=`cat /etc/mailname 2> /dev/null || hostname -f`
    (openssl req -new -x509 -days 365 -nodes -out $SSL_CERT -keyout $SSL_KEY >/dev/null 2>&1 <<EOF
.
.
.
FTP server
$hostname.$domainname
$fqdn
root@$mailname
EOF
)
    echo "CN: Self-signed SSL certificate generated in $SSL_CERT."
    echo "CN: Please note that the certificate will expire in one year."
  fi
}

disable_anonymous
make_ssl_cert
fix_conf
add_tls
include_modules

if [ -z "$2" ]; then
  echo "CN: Proftpd-cn is configured with disabled anonymous FTP access,"
  echo "CN: for the security reasons."
fi

if ! cmp -s $FTP_TMP $FTP_CONF; then
  echo "CN: Original configuration file is saved in $FTP_OLD."
  cp_mv $FTP_TMP $FTP_CONF
else
  rm -f $FTP_TMP
fi

echo "CN: Restarting proftpd..."
service proftpd restart

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.

#DEBHELPER#

exit 0