#!/usr/bin/bash

#***************************************************************************
# This file is part of the CRYPTO BONE
# File     : safewebdropregistration (client) 
# Version  : 1.6 (ALL-IN-ONE)
# License  : BSD
# Date     : 12 May 2023
# Contact  : Please send enquiries and bug-reports to innovation@senderek.ie
#
#
# Copyright (c) 2015-2023
#	Ralf Senderek, Ireland.  All rights reserved. (https://senderek.ie)
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#	   This product includes software developed by Ralf Senderek.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND  ANY EXPRESS OR 
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE  IMPLIED WARRANTIES 
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
# POSSIBILITY OF SUCH DAMAGE.
#
#****************************************************************************

#----------------------------------------------------#
# load functions and global variables
. /usr/lib/cryptobone/safewebdrop/bin/client-functions

# no parameter !

KEY=/usr/lib/cryptobone/safewebdrop/pubkey.pem
SOCK="/usr/lib/cryptobone/secrets.sock"

# in production use webdropsecret, webdropserver and webdropuser

PASS=$(/usr/bin/echo "get-element webdropsecret" | /usr/bin/socat -t15 - UNIX-connect:$SOCK 2> /dev/null)
HOST=$(/usr/bin/echo "get-element webdropserver" | /usr/bin/socat -t15 - UNIX-connect:$SOCK 2> /dev/null)
ID=$(/usr/bin/echo "get-element webdropuser" | /usr/bin/socat -t15 - UNIX-connect:$SOCK 2> /dev/null)


function sanitize_username {
     R=$(/usr/bin/echo -n $1 | /usr/bin/tr -d '\\\n\t !	"§$%&/()=?`´#*+~;:,|^°_')
     R=$(/usr/bin/echo -n $R | /usr/bin/cut -c-25)
     /usr/bin/echo -n "$R"
}

function clean2 {
     /usr/bin/rm -f ${MSG} 2>/dev/null
}

log "--- registration ---"

CHALLENGE=""
# check that the desired ID ID is valid
NEWID=$(sanitize_username ${ID})
ID=${NEWID}
log "NEW ID ${ID}"

if [[ ${PASS} ]] && [[ ${HOST} ]] && [[ ${ID} ]] ; then

     # phase 1: send REGISTRATION request
     CHALLENGE=$(/usr/bin/curl https://${HOST}/cgi-bin/safewebdropregistration?${ID}\&REGISTRATION 2> /dev/null)
     if (( ${#CHALLENGE} != 64 )) ; then
          log "I-register:  no challenge -> EXIT"
	  exit 2
     fi
     log "I-register:  ${ID} CHL=${CHALLENGE}"

     # phase 2: create a valid request

     /usr/bin/rm -f ${REQ}.hash.sig  2> /dev/null
     # user:request
     /usr/bin/echo -n "${ID}:" > $REQ
     /usr/bin/echo -n "${CHALLENGE}:" >> $REQ

     # generate a hash of the request
     generate_requesthash
     
     # base64 encode the public key
     base64 --wrap=0 ${KEY} > ${KEY}.b64
     
     # and send both, the signed request and the pubkey
     if (( ${#SIG} > 10 )) && [[ -s ${KEY}.b64 ]] ; then
	  REQUEST=$(/usr/bin/cat ${REQ})
	  PUBKEY=$(/usr/bin/cat ${KEY}.b64)

          RCODE=$(/usr/bin/curl https://${HOST}/cgi-bin/safewebdropregistration?${ID}\&${REQUEST}\&${SIG}\&${PUBKEY} 2> /dev/null)
	  log "II-register : $ID: $(/usr/bin/date +'%x %X'): ${#RCODE} bytes received"
          if [[ ${RCODE} ]] && [[ ${RCODE} != "none" ]]  ; then
	       log "III-register:  ${RCODE}  $(/usr/bin/date +'%x %X')"
	       /usr/bin/echo -n "${RCODE}" 
	  else
	       log "III-register:  failed  $(/usr/bin/date +'%x %X')"
	  fi
     else
          log "II-register: no signature or ${KEY}.b64"
     fi
else
     log "not enough parameter"
     exit 1
fi
exit 0