#!/usr/bin/bash

##############################################################################
# This file is part of the CRYPTO BONE
# File     : sendcrosspermission  (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.
##############################################################################

# Parameter: 
# $1 is the sender ID ()   
# $2 is the sender's HOST ()   
# $3 is the cross ID ID
# $4 is the cross SERVER

#----------------------------------------------------#
# load functions and global variables
. ./test-functions

if [[ -r ../safewebdrop.config ]] ; then
   . ../safewebdrop.config
fi

SENDER=${ID}
# let parameters overwrite SENDER, HOST, CROSSID and CROSSSERVER
if (( $# >= 4 )) ; then
    SENDER="$1"
    ID="$1"
    HOST="$2"
    CROSSID="$3"
    CROSSSERVER="$4"
    if (( $# == 5 )) ; then
         DEBUG="$5"
    fi
fi

if [[ ${DEBUG} = "yes" ]] ; then
    set -vx; exec 2>$0.trc
    /usr/bin/echo "debugging is ON ..."
fi

/usr/bin/echo "***** safewebdrop *****"
/usr/bin/echo "Sending a cross server allowance from ${SENDER}%${HOST}  to ${CROSSID}%${CROSSSERVER}"
/usr/bin/echo "The initial secret is taken from the config file!"
/usr/bin/echo "***** ----------- *****"
/usr/bin/echo
/usr/bin/echo "Debug = ${DEBUG}"
/usr/bin/echo -n "continue? "
read REPLY
if [[ "${REPLY}x" != "yesx" ]] ; then
    /usr/bin/echo "exiting, yes continues here"
    /usr/bin/echo "usage: sendcrosspermission SENDER HOST CROSSID CROSSSERVER  [[yes|no]] (overwrites config) "
    exit 1
fi    

REQ="../${SENDER}/contactrequest"
MSG="../${SENDER}/contactmessage"

# PHASE 1: send ALLOW request
CHALLENGE=$(/usr/bin/curl https://${HOST}/cgi-bin/safewebdroppermission?${SENDER}\&ALLOW 2>/dev/null)
/usr/bin/echo "SERVER -> I:   CHL=${CHALLENGE}  "

# PHASE 2: create a valid permission request
/usr/bin/echo -n "${CHALLENGE}:" > ${REQ}
/usr/bin/echo -n "${CROSSID}%${CROSSSERVER}:" >> ${REQ}

# generate the hash ([[A%S, B%S2, secret]])
/usr/bin/echo -n "${SENDER}%${HOST}:" > ${MSG}
/usr/bin/echo -n "${CROSSID}%${CROSSSERVER}:" >> ${MSG}
/usr/bin/echo -n "${SEC}" >> ${MSG}
HASHVALUE=$(/usr/bin/cat ${MSG} | /usr/bin/sha256sum | /usr/bin/cut -c-64 )
/usr/bin/echo -n "${HASHVALUE}" >> ${REQ}

# generate a hash of the request 
generate_requesthash
# and send it
REQUEST=$(/usr/bin/cat ${REQ})
OK=$(/usr/bin/curl https://${HOST}/cgi-bin/safewebdroppermission?${SENDER}\&${REQUEST}\&${SIG} 2> /dev/null)
/usr/bin/echo "SERVER -> II: ${SENDER}%${HOST}  ${#OK} bytes received"
if [[ ${OK} = "OK" ]]  ; then
     /usr/bin/echo "SERVER -> III: OK valid permission sent for ${CROSSID}%${CROSSSERVER}"
fi

/usr/bin/echo "----end----"
exit 0