cipherscan/CiphersScan.sh
2013-07-17 15:07:14 -04:00

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#!/usr/bin/env bash
DOBENCHMARK=0
BENCHMARKITER=10
#OPENSSLBIN="/home/ulfr/Code/openssl/apps/openssl"
OPENSSLBIN=$(which openssl)
REQUEST="GET / HTTP/1.1
Host: $TARGET
"
verbose() {
if [ $VERBOSE -eq 1 ];then
echo $@
fi
}
# Connect to a target host with the selected ciphersuite
test_cipher_on_target() {
local sslcommand=$@
local tmp=$(mktemp)
$sslcommand 1>"$tmp" 2>/dev/null << EOF
$REQUEST
EOF
# Parse the result
result=$(grep "New, " $tmp|awk '{print $5}')
rm "$tmp"
if [ "$result" == '(NONE)' ]; then
verbose "handshake failed, server returned ciphersuite '$result'"
return 1
else
verbose "handshake succeeded, server returned ciphersuite '$result'"
return 0
fi
}
# Calculate the average handshake time for a specific ciphersuite
bench_cipher() {
local ciphersuite="$1"
local sslcommand="$OPENSSLBIN s_client -connect $TARGET -cipher $ciphersuite"
local t="$(date +%s%N)"
verbose "Benchmarking handshake on '$TARGET' with ciphersuite '$ciphersuite'"
for i in $(seq 1 $BENCHMARKITER); do
$sslcommand 2>/dev/null 1>/dev/null << EOF
$REQUEST
EOF
done
# Time interval in nanoseconds
local t="$(($(date +%s%N) - t))"
verbose "Benchmarking done in $t nanoseconds"
# Milliseconds
cipherbenchms="$((t/1000000/$BENCHMARKITER))"
}
# Connect to the target and retrieve the chosen cipher
get_cipher_pref() {
local ciphersuite="$1"
local sslcommand="$OPENSSLBIN s_client -connect $TARGET -cipher $ciphersuite"
verbose "Connecting to '$TARGET' with ciphersuite '$ciphersuite'"
test_cipher_on_target "$sslcommand"
local success=$?
# If the connection succeeded with the current cipher, benchmark and store
if [ $success -eq 0 ]; then
cipherspref=("${cipherspref[@]}" "$result")
get_cipher_pref "!$result:$ciphersuite"
return 0
fi
}
if [ -z $1 ]; then
echo "
usage: $0 <target:port> <-v>
$0 attempts to connect to a target site using all the ciphersuites it knowns.
jvehent - ulfr - 2013
"
exit 1
fi
TARGET=$1
VERBOSE=0
if [ ! -z $2 ]; then
if [ "$2" == "-v" ]; then
VERBOSE=1
echo "Loading $($OPENSSLBIN ciphers -v ALL 2>/dev/null|grep Kx|wc -l) ciphersuites from $(echo -n $($OPENSSLBIN version 2>/dev/null))"
$OPENSSLBIN ciphers ALL 2>/dev/null
fi
fi
echo
cipherspref=();
results=()
get_cipher_pref "ALL"
ctr=1
for cipher in "${cipherspref[@]}"; do
if [ $DOBENCHMARK -eq 1 ]; then
bench_cipher "$cipher"
r=$(echo "$ctr $cipher $cipherbenchms"|awk '{printf "%-2d) %-30s avg_handshake= %-5d ms\n",$1,$2,$3}')
else
r=$(echo "$ctr $cipher"|awk '{printf "%-2d) %-30s\n",$1,$2}')
fi
results=("${results[@]}" "$r")
ctr=$((ctr+1))
done
echo
echo "Ciphersuites sorted by server preference"
for result in "${results[@]}"; do
echo $result
done
echo
echo R | $OPENSSLBIN s_client -connect $TARGET 2>/dev/null| grep 'Secure Renegotiation'|sort|uniq